NSK Ball Screws for High-Load Drive

Transcription

1 NSKTAC Series of all Screw Support earings for High-Load Applications NSK Roller Guide RA Series We have developed easy-to-use ball screws for high-load applications and now offer a wide variety of products suited for high-load drives. These ball screws enable the electric servo drive to operate under the most severe conditions.

2 Lineup of NSK all Screws for High-Load Drive est suited design for high-load applications The best arrangement of the ball recirculation circuits and use of the largest possible ball have significantly contributed to the enhancement of high-load bearing characteristics. (Refer to pages 6 and 7 for details.) HTF-SRC Type Enables a maximum speed of 0 mm/s with fine screw leads. HTF-SRD Type Enables a maximum speed of 600 mm/s with coarse screw leads. P P6 P7 P0 Large Equipped with Grease Retaining A Seals Optimized design of A seal enables superior grease retaining performance. P P6 HTF-SRD HTF-ASRD HTF-SRE HTF-ASRC Type HTF-ASRD Type Lead mm HTF-SRE Type To speed up large machinery. P7 P8 HTF-SRC HTF-ASRC HTF HTF Type Screw diameters of to 00 mm Leads of to mm Provides a wide range of screw diameter and lead combinations. P P8 Peripheral products for high-load drive ball screws Small Small Shaft dia. mm Large As well as long shafts, a variety of shaft end configurations are available for high torque transmission. Examples: Involute spline (JIS 60) Straight-sided spline (JIS 60) Keyways High-load ball screws for injection molding machine ejectors NSKTAC series of ball screw support bearings NSK roller guide RA series P P P4 P44 P45 P46 There are high load capacity options available for the above ball screws for applications where a large load is applied with relatively short strokes.

3 Technical Description Technical Description Examples of Application Features Application HTF Type SRC Type SRD Type SRE Type Injection molding machine For mold clamp axial drive HTF-SRD+A seal Die cast machine Servo press Press brake Punch press Powder press For injection axial drive HTF-SRC-A seal, HTF-SRE, HTF ending machine Press fitting machine There are high load capacity options available for applications with large loads with relatively short strokes, such as press fitting machine. Please consult NSK. Injection molding machine For ball screw support all screw support bearing NSKTAC series Elevating machine NSK high-load drive ball screws have maximized the ball diameter and increased the number of valid load balls for a design that can withstand a high load. They have achieved a high reliability through many different technologies including even load distribution. Technology for high-speed feeding and preserving the work environment have also been added to accommodate the needs of various devices requiring a large load and high reliability, such as hydraulic cylinder replacement. In addition to high load design, all series are equipped with ball retaining piece S for High reliability preventing ball competition and helping even nut load distribution, and other original NSK technology to meet a high load bearing requirements. High-speed feeding High environmental properties Feeding speed has been increased to improve efficiency of the machine and injection. Maximum speeds are 0 mm/s with a fine lead and,600 mm/s with a coarse lead. With sophisticated seal technology, grease splattering has been reduced and less topping up is needed in response to ever increasing concerns for environment. The chart below shows technologies used for each series to achieve high reliability, high-speed feeding and environmental consideration. Press machine all screws for high load drive Line up H T F S R C - H T F S R D - H T F A S R C - H T F A S R D - H T F S R E - H T F Technology used Design for high load Ejector axial drive Mold clamp force of 0t and over: HTF-SRC+A seal Mold clamp force under 0t: Horizontal ball screws for ejectors For plasticating movement axial drive Horizontal ball screws for ejector High reliability P5~ all retaining piece S Even load distribution [] (radial load balance) Even load distribution [] (in consideration of axial nut material expansion and contraction) High load capacity option (optional) Press part HTF-SRE HTF-SRC+A seal HTF-SRD+A seal High-speed feeding P8~ High d/n circulation route design all groove shape for high speed Coarse lead setting Die cushion part HTF-SRD+A seal High environmental properties P~ Grease retaining A seals Low noise 4

4 Technical Description NSK all Screws for High-Load Drive - Technical Description High reliability With ball screws that carry large loads, it is important to distribute the load evenly to each ball. NSK high-load drive ball screws have improved reliability with the load distribution technology described below. Design for high load Theory of even load distribution (applies to SRC and return tube types) NSK ball screws for high load drive have increased load capacity by maximizing the diameter of balls in relation to the lead, increasing the number of valid load balls and optimizing the shape of ball groove for a design that can withstand high load. [Patent pending] Technology to evenly distribute nut load all return tubes are located 0 degrees apart for equal load distribution to the balls. Minimum difference between upper and lower balls Resin Retaining Piece NSK S A moment load caused by misalignment of a ball screw can hinder smooth motion of the balls, thus causing ball jamming in the ball recirculation circuits and adversely affecting the durability of the ball screw. y incorporating the resin retaining piece NSK S between balls, NSK has greatly improved the durability of ball screws under a moment load. 4 turns Conventional design Difference: turns 6 turns 5 turns Conventional NSK S Difference: 0 turns HTF design 5 turns Durability test with continuous high load Test model: HTF5-7.5 All load balls (without S), and with S Load distribution to balls Test conditions: Load condition: Forward 00 kn, ack 0 kn Stroke: mm, Cycle time: sec Lubrication: Grease Temperature: Normal Max. 0.0 mm 0. mm 0. mm Load on balls, kn Mounting error: 4 Conventional design HTF design 0 Outer surface of balls Axial position of balls, mm All load balls: very good All load balls: damaged With S: very good (after 000 cycles) (after 000 cycles) (after 000 cycles) 6

5 Technical Description Technical Description Even load distribution [] With ball screws that carry a large load, the deformation of components (axis, nut) cannot be disregarded. ased on the load points adapted for screws and nuts in the illustration below (A) (recommended installation), the influence of contraction and expansion in the screw shaft and nut axial direction is offset and inner nut load is evenly distributed. To make these measures even more effective, axis and the cross section of nut are placed as close to each other as possible in HTF-SRC and HTF models. F (A) F () - High-speed feeding High d/n circulation route design [Patent pending] y smoothly picking up balls in the direction tangent to the screw groove, the impact of the balls colliding on other components will be reduced. d/n values (shaft diameter x number of rotations) for speed of circulation components is more than twice as fast as the conventional tube recirculation system. Load distribution Load distribution Smooth picking up of balls in the tangential direction Smooth picking up of balls in the tangential direction Effect of nut deformation (shaft is rigid) Effect of shaft deformation (nut is rigid) = = = SRC circulation type End deflector circulation type 4 Combination Options for high load capacity Improving load bearing performance considerably Load limits for high-load drive ball screws are () Allowable axial load (load limit beyond which stress on ball contact surface has extremely adverse effect on fatigue life) () Limit axial load (limit load of ball and axial groove contact surface reaching groove shoulder). Through inner spec optimization, limit axial load can be up to. times greater than conventional high-load drive ball screws. These are suitable for applications where a large load is applied at relatively short strokes, such as sheet metal presses, press brakes, servo presses, mold presses, etc. Choices are made in consideration of balance between enhanced load bearing and service life. Please consult NSK. A wide range of variations all screws with this option are compatible with all types of highload drive ball screws, such as HTF-SRC, HTF-SRD and greaseretaining A series in terms of size. Limit axial load [kn] Conventional HTF High load capacity spec 6 Diameter [mm] Downsizing Comparing when lead and circuit route are the same all groove shape for high speed While rotating at a high speed, the ball collides with the axis at a high speed. With optimal-design ball grooves, pressure on the ball groove surface is minimized during ball collision, preventing shaft damage. Coarse lead setting Special groove shape to prevent high stress. [Patent pending] To achieve higher feeding, coarse lead setting is available.(for example, shaft diameter mm for a lead of mm). This, along with high d/n values, enables a high speed feeding. 7 8

6 Technical Description Technical Description - High environmental properties Grease retaining A seal [Patent pending] Low friction torque and low-heat generation The increase of dynamic torque caused by the A seal is very small (0 to Ncm in case of ball screw with -mm diameter). This level of increase has practically no impact on the driving torque. The practical temperature rise caused by the A seal is merely to deg C higher than that of existing plastic seals. Greatly improved grease retaining performance Thanks to the special ball groove profile of the screw shaft together with the grease retaining A seal, the grease retaining characteristics have greatly improved compared with those of existing plastic seals. Construction of ball screw equipped with grease retaining A seal Grease leakage at initial cycle operation (Test piece: HTF-ASRC66-.5 with high-load grease with an extreme pressure additive [worked penetration: 00]) Grease retaining A seal Grease drain hole With conventional labyrinth seals With grease retaining A seals Suppresses grease scattering and preserves a clean environment y opening the discharge holes for running-in after grease supplementation, etc., excess grease is discharged. y removing excess grease, grease splatter in high speed operation is reduced. Use of the A seal greatly suppresses grease scattering, showing a significant improvement over the use of existing plastic seals. The A seal simplifies the design of your cover, helping to preserve a clean and healthy environment. Test conditions Test piece HTF-ASRC66-.5 Grease splash after -cycle operation Speed 600 min Stroke 0 mm Lubrication High-load grease with an extreme pressure additive Low noise SRC Type After initial run of cycles at 00 min, grease was wiped off from shaft OD, then photos were taken at the speed of 600 min. y smoothly picking up balls in the screw shaft tangent direction, impact of ball collision on other components can be reduced. Compared to conventional tube type, the noise is reduced by over 6d (A). Noise level [d (A)] 0 SRD Type Conventional tube type 60 With existing plastic seals (stroke center area) With grease retaining A seals (stroke center area).e+05.e+06.e+07 Dw dm n

7 Technical Description Technical Description In use Life of all Screw Computational life, which is estimated by calculation, is the flaking life caused by rolling contact fatigue. The fatigue life of a ball screw can be estimated by basic dynamic load rating (Ca). Conditions for attaching ball screws With design aimed at high loads and even inner nut load distribution, NSK high-load drive ball screws have achieved high-load performance. (See page 7) To make the most of these features, installation according to the illustration below is recommended. The bolt holes of the installation surface in this catalog have been set on an assumption that load is received on the surface of the nut flange. If there is drag load on the bolt for mounting ball screw, the strength of bolts should be carefully considered. Also make sure to center the ball screw with guides. asic dynamic load rating (Ca) asic dynamic load rating (Ca) is the axial load that allows 0% of a group of the same ball screws to rotate one million times ( 6 rev) under the same conditions without flaking occurring due to rolling contact fatigue. asic dynamic load ratings (Ca) are shown in the dimension tables. How to calculate fatigue life The fatigue life of a ball screw is obtained by the following formula. HTF-SRC,HTF-ASRC, HTF type of recommended mounting direction racket Fixed support bearing, motor side Motor L = Lt = Ls = Ca Fa fw *The load factor is decided by operating conditions. Consult NSK when impact and/or vibrations occur during the operation. L 60n L l 6 6 L: Lt: Ls: Ca: Fa: n: l: fw: Rated fatigue life (rev) Life in hours (h) Life by running distance (km) asic dynamic load rating (N) Axial load (N) Rotational speed (min - ) Lead (mm) Load factor* Main external load Cautions regarding lubrication When using ball screws, lubricant needs to be replenished. As time passes, lubricant and its functions deteriorate. Lubricant inside of nuts is gradually discharged by stroke motions. Also, operating environments results in impurities in lubricant. Therefore, lubricant needs to be supplemented regularly. [If high load is applied, use of load withstanding grease containing extreme pressure additives is recommended.] 4 Operating temperature As the temperature of ball screws rises during use, the strength of the oil film of the lubricant decreases and there is a risk of inadequate lubrication. e sure to use them at temperatures below deg C (temperature at nut diameter). Contact NSK to ask about environments and use conditions that can easily become too hot. Other For other information on general technology of ball screws, see the section of ball screw technical explanations in the precision product catalog (CAT. No. 6).

8 HTF-SRC Type HTF-SRC Type Specifications Recirculation system: Equipped with SRC (Smooth Return Coupling) y smoothly picking up balls in the direction tangent to the screw groove, feeding speed is twice as fast as the conventional tube recirculation system while the noise is half or less. Picks up balls, forcibly changing their direction. Smoothly picks up balls in the direction they are moving. Accuracy grade Ct7 of JIS (7) is applicable as the standard accuracy grade. Axial play Standard axial play: 0.00 mm or less, or 0.0 mm or less Optional specs High-speed performance two times greater than existing products High load capacity option to increase limit axial load. See page 7 for details. Consult NSK if the number of circuits is to be changed for a higher load capacity or circulation routes are to be placed on a single side. Noise reduced by 6 d (A) or more compared with return tube type Existing return tube type Allowable d n value and feed speed Lead and 6 mm: or less Lead 0 and 5 mm: 000 or less d n: Shaft diameter d (mm) Rotational speed n (min ) Allowable feed speed of combinations of shaft diameter and lead Shaft dia. (mm) Lead (mm) SRC type Unit [mm/s] Design Precautions ) When designing the shaft ends, one end of the screw shaft must have ball groove cut through to the shaft end or the ball groove root diameter must be dr or less (see dimension chart), otherwise the ball nut cannot be installed on the screw shaft. ) Please consult NSK with your special design requirements Selection of all Screw Please refer to pages and for details on the operating life of the ball screw and instructions on installation and lubrication. Please consult NSK in the case of a short stroke operation less than or equal to four times the length of the ball screw lead.capacity or circulation routes are to be placed on a single side Operating Temperature Use temperature: deg C maximum (temperature at nut diameter). Use at or below 60 deg C is recommended.

9 HTF-SRC Type HTF-SRC Type Outline drawing 4-φ X drill PCD W Seal (both ends) Seal (both ends) V max. V max. φ D φ D φ Dh (encompasses protruding part) Q (oil hole) Without seal Q (oil hole) Without seal U max. U max. T T T M T T T T M L L Nut modelⅠ Nut model Ⅱ HTF-SRC Type Specifications Unit [mm] Model No. Lead r Shaft dia. d Root dia. d r Effective ball turns Turns Circuits Nut model asic load rating Dynamic C a all nut dimensions Static C 0a D A L M W X U V Dh Q T T Allowable axial load Fa max. HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC HTF-SRC Remarks:. The ball nut length with no seals is shorter by M than that of a ball nut with seals.. Please consult NSK if load exceeds the allowable axial load (Fa max.).. The right hand screw is the standard. For specifications on left hand screws, contact NSK. 4. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK. 5 6

10 HTF-SRD Type HTF-SRD Type Specifications Recirculation system: Equipped with end deflector y smoothly picking up balls in the direction tangent to the screw groove, feeding speed is twice as fast as the conventional tube recirculation system while the noise is half or less. Picks up balls, forcibly changing their direction. Smoothly picks up balls in the direction they are moving. Accuracy grade Ct7 of JIS (7) is applicable as the standard accuracy grade. Axial play Standard axial play: 0.00 mm or less, or 0.0 mm or less Seal High-lead specification optimal for high speed The ball nut length is shortened by the use of thin seals. Noise reduced by 6 d (A) or more compared with return tube type Option High load capacity option to increase limit axial load. See page 7 for details. Please consult NSK if you are considering nut rotation. Existing return tube type Allowable d n value and feed speed d n: 000 or less d n: Shaft diameter d (mm) Rotational speed (min - ) End deflector type Design Precautions ) When designing the shaft ends, one end of the screw shaft must have ball groove cut through to the shaft end or the ball groove root diameter must be dr or less (see dimension chart), otherwise the ball nut cannot be installed on the screw shaft. ) Please consult NSK with your special design requirements. Allowable feed speed of combinations of shaft diameter and lead Lead (mm) 60 Shaft dia. (mm) 600 Unit [mm/s] Selection of all Screw Please refer to pages and for details on the operating life of the ball screw and instructions on installation and lubrication. Please consult NSK in the case of a short stroke operation less than or equal to four times the length of the ball screw lead.capacity or circulation routes are to be placed on a single side Operating Temperature Use temperature: deg C maximum (temperature at nut diameter). Use at or below 60 deg C is recommended. 7

11 HTF-SRD Type HTF-SRD Type Outline drawing -Q (oil hole) T φ X drill PCD W φ D L H HTF-SRD Type Specifications Unit [mm] Model No. Lead r Shaft dia. d asic load rating all nut dimensions Root dia. Dynamic Static d r C a C 0a D A L H W X Q T Allowable axial load Fa max. HTF-SRD6-4E HTF-SRD-6E HTF-SRD-8E HTF-SRD6-6E HTF-SRD6-8E HTF-SRD-6E HTF-SRD-8E HTF-SRD60-6E HTF-SRD60-8E HTF-SRD-6E HTF-SRD-8E Remarks:. Please consult NSK if load exceeds the allowable axial load (Fa max.).. The right hand screw is the standard. For specifications on left hand screws, contact NSK.. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK. 0

12 HTF-ASRC Type and HTF-ASRD Type HTF-ASRC Type and HTF-ASRD Type Equipped with Grease Retaining A Seal Specifications Equipped with grease retaining A seal The optimum design of the A seal (patent applied for and pending) allows superior grease retaining performance. Recirculation system: Equipped with SRC or end deflector These ball screws are used with the SRC or the end deflector recirculation system, which pick up balls smoothly in the direction they are moving. Smoothly picks up balls in the direction they are moving. Smoothly picks up balls in the direction they are moving. Accuracy grade Ct7 of JIS (7) is applicable as the standard accuracy grade. Axial play Standard axial play: 0.00 mm or less, 0.0 mm or less Option High load capacity option to increase limit axial load. See page 7 for details. Design Precautions ) When designing the shaft ends, one end of the screw shaft must have ball groove cut through to the shaft end or the ball groove root diameter must be dr or less (see dimension chart), otherwise the ball nut cannot be installed on the screw shaft. ) The table below shows the maximum length of screw shaft for the equipment of the A seal. ) Please contact NSK with your special design requirements. Unit [mm] Shaft dia. Max. shaft length 8 SRC type End deflector type 6, 00 Allowable d n value and feed speed Lead 6 mm: or less Lead 0 and 5 mm: 000 or less Lead, and mm: 000 or less d n: Shaft diameter d (mm) Rotational speed (min - ) Selection of all Screw Allowable feed speed of combinations of shaft diameter and lead Lead (mm) HTF-ASRC Type Shaft dia. (mm) Unit [mm/s] HTF-ASRD Type Please refer to pages and for details on the operating life of the ball screw and instructions on installation and lubrication. Please consult NSK in the case of a short stroke operation less than or equal to four times the length of the ball screw lead. 4 Environmental Conditions Use temperature: deg C maximum (temperature at nut diameter). Use at or below 60 deg C is recommended. Never use in an environment where degreasing solvents are present. Examples: grease-removing organic solvent such as hexane or thinner, white kerosine, rust preventive oil (containing white kerosine)

13 HTF-ASRC Type HTF-ASRC Type Outline drawing 4-φ X drill S S -Grease retaining A seal S S -Grease retaining A seal V max. E E V max. φ D φ D PCD W φ Dh (encompasses protruding part) -Oil hole Q -Drain hole S 4-Oil hole Q -Drain hole S U max. U max. T T T T T T T L L Nut modelⅠ Nut model Ⅱ HTF-ASRC Type Specifications Unit [mm] Model No. Lead r Shaft dia. d Root dia. d r Effective ball turns Turns Circuits Nut model asic load rating Dynamic C a all nut dimensions Static C 0a D A L W X U V Dh Q T T S E S S Allowable axial load Fa max. HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ HTF-ASRC Rc/ Remarks:. Drain holes shall be plugged for shipping.. The right hand screw is the standard. For specifications on left hand screws, contact NSK.. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK. 4

14 HTF-ASRD Type HTF-ASRD Type Outline drawing T T -Grease retaining A seal -Oil hole Q 6-φ X drill PCD W H φ D φ φ φ d r d A S S L -Drain hole S φ counterbore depth 0 0 HTF-ASRD Type Specifications Unit [mm] Model No. Lead r Shaft dia. d Root dia. d r asic load rating Dynamic C a Static C 0a D A L H W all nut dimensions X Q T T S S S Allowable axial load Fa max. HTF-ASRD6-4E Rc/ HTF-ASRD-6E Rc/ HTF-ASRD-8E Rc/ HTF-ASRD6-6E Rc/ HTF-ASRD6-8E Rc/ HTF-ASRD-6E Rc/ HTF-ASRD-8E Rc/ HTF-ASRD60-6E Rc/ HTF-ASRD60-8E Rc/ Remarks:. Drain holes shall be plugged for shipping.. The right hand screw is the standard. For specifications on left hand screws, contact NSK.. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK. 5 6

15 HTF-SRE Type HTF-SRE Type High-speed performance two times greater than existing products Abundant variation Specifications Recirculation system: picking up balls in the direction tangent to deflector y smoothly picking up balls in the direction of the screw groove tangent, feeding speed is.4 to times as fast as the conventional tube recirculation system. Smooth ball recirculation Deflector Accuracy grade Ct7 of JIS (7) is applicable as the standard accuracy grade. Axial play Standard axial play: 0.0 mm or less Option High load capacity option to increase limit axial load. See page 7 for details. Consult NSK if the number of circuits is to be changed for a higher load capacity or circulation routes are to be placed on a single side. Picking up in the direction of the screw groove tangent Allowable d-n value Allowable d-n value,000 d-n value: shaft diameter d [mm] rotations n [min - ] Allowable feed speed of combinations of shaft diameter and lead Shaft dia Lead 5 0 Please consult NSK about ball nut shape and dimensions. A double-spread screw can be used for leads of mm and more. Picking up in the lead direction tangent Unit [mm] Allowable rotating speed [min - ] Design Precautions ) When designing the shaft ends, one end of the screw shaft must have ball groove cut through to the shaft end or the ball groove root diameter must be dr or less (see dimension chart), otherwise the ball nut cannot be installed on the screw shaft. ) Please consult NSK with your special design requirements Selection of all Screw Please refer to pages and for details on the operating life of the ball screw and instructions on installation and lubrication. Please consult NSK in the case of a short stroke operation less than or equal to four times the length of the ball screw lead.capacity or circulation routes are to be placed on a single side. 4 Operating Temperature Use temperature: deg C maximum (temperature at nut diameter). 7 8

16 HTF Type HTF Type Specifications Allowable d n value and feed speed Lead 0 mm or less 5 mm 0 to mm Design Precautions ) When designing the shaft ends, one end of the screw shaft must have a ball groove cut through to the shaft end or the ball groove root diameter must be dr or less (see dimension chart), otherwise the ball nut cannot be installed on the screw shaft. ) Please consult NSK with your special design requirements. Standard High-speed d n: Shaft diameter d (mm) Rotational speed (min - ) 000 For even faster specs, HTF-SRC is recommended (See pages 6 for details). Selection of all Screw Allowable feed speed of combinations of shaft diameter and lead Unit [mm/s] Shaft dia. [mm] Leads with a diameter of 0 mm or less have high-speed feeding specs. Lead [mm] Please refer to pages and for details on the operating life of the ball screw and instructions on installation and lubrication. Please consult NSK in the case of a short stroke operation less than or equal to four times the length of the ball screw lead. 4 Operating Temperature Use temperature: deg C maximum (temperature at nut diameter) Accuracy grade Ct7 of JIS (7) is applicable as the standard accuracy grade. Axial play Standard axial play: 0.00 mm or less, or 0.0 mm or less Optional specs High load capacity option to increase limit axial load. See page 7 for details. Consult NSK if the number of circuits is to be changed for a higher load capacity or circulation routes are to be placed on a single side. 0

17 HTF Type HTF Type Outline drawing 4-φ X drill PCD W Seal (both ends) 4-φ X drill PCD W Seal (both ends) Seal (both ends) V max. φ Dg6 V max. V max. φ Dg6 φ Dg6 φ Dh (encompasses protruding part) Without seal Without seal Without seal U max. φ Dh (encompasses protruding part) Q (oil hole) U max. U max. Q (oil hole) T T M T T T M T T T T L L L M Q (oil hole) Nut modelⅠ Nut model Ⅱ Nut model Ⅲ HTF Type Specifications Unit [mm] Model No. Lead r Shaft dia. d Root dia. d r Effective ball turns Turns Circuits Nut model asic load rating all nut dimensions Dynamic C a Static C 0a D A L M W X U V Dh Q T T Allowable axial load Fa max. HTF-5 HTF6-5 HTF-7.5 HTF HTF45- HTF-7.5 HTF- HTF HTF55- HTF6-5 HTF-7.5 HTF HTF-7.5 HTF- HTF HTF55- HTF6-7.5 HTF Remarks:. The ball nut length with no seals is shorter by M than that of a ball nut with seals.. Please consult NSK if load exceeds the allowable axial load (Fa max.).. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK.

18 HTF Type HTF Type Outline drawing 4-φ X drill PCD W Seal (both ends) Seal (both ends) V max. V max. φ Dg6 φ Dg6 φ Dh (encompasses protruding part) Without seal Without seal U max. U max. Q (oil hole) Q (oil hole) T T T M T T T T L L M Nut model Ⅱ Nut model Ⅲ HTF Type Specifications Unit [mm] Model No. Lead r Shaft dia. d Root dia. d r Effective ball turns Turns Circuits Nut model asic load rating Dynamic C a Static C 0a all nut dimensions D A L M W X U V Dh Q T T Allowable axial load Fa max. HTF HTF HTF HTF HTF HTF HTF HTF HTF HTF HTF HTF Remarks:. The ball nut length with no seals is shorter by M than that of a ball nut with seals.. Please consult NSK if load exceeds the allowable axial load (Fa max.).. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK. 4

19 HTF Type HTF Type Outline drawing 4-φ X drill PCD W Seal (both ends) Seal (both ends) V max. V max. φ Dg6 φ Dg6 φ Dh (encompasses protruding part) Without seal Without seal U max. U max. T Q (oil hole) T T M T T T T L L M Q (oil hole) Nut model Ⅱ Nut model Ⅲ HTF Type Specifications Unit [mm] Model No. Effective ball asic load rating all nut dimensions Lead Shaft dia. Root dia. turns Nut model Turns Dynamic Static r d Circuits C a C 0a D A L M W X U V Dh Q T T d r Allowable axial load Fa max. HTF60-.5 HTF0-7.5 HTF0- HTF0-7.5 HTF0- HTF-.5 HTF- HTF-7.5 HTF- HTF5-7.5 HTF5- HTF5-7.5 HTF5- HTF5-7.5 HTF5- HTF5-.5 HTF5- HTF HTF Remarks:. The ball nut length with no seals is shorter by M than that of a ball nut with seals.. Please consult NSK if load exceeds the allowable axial load (Fa max.).. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK. 5 6

20 HTF Type HTF Type Outline drawing 4-φ X drill PCD W Seal (both ends) Seal (both ends) V max. V max. φ Dg6 φ Dg6 φ Dh (encompasses protruding part) Without seal Without seal U max. U max. T Q (oil hole) T T M T T T T L L M Q (oil hole) Nut model Ⅱ Nut model Ⅲ HTF Type Specifications Unit [mm] Model No. Effective ball asic load rating all nut dimensions Lead Shaft dia. Root dia. turns Nut model Turns Dynamic Static r d Circuits C a C 0a D A L M W X U V Dh Q T T d r Allowable axial load Fa max. HTF-7.5 HTF- HTF-.5 HTF HTF600- HTF HTF HTF000- HTF-7.5 HTF- HTF-.5 HTF HTF60- HTF60-.5 HTF HTF Remarks:. The ball nut length with no seals is shorter by M than that of a ball nut with seals.. Please consult NSK if load exceeds the allowable axial load (Fa max.).. The allowable axial load (Fa max.) is determined in accordance with the mounting conditions of ball screws recommended by NSK. Refer to page for the mounting conditions. If your mounting conditions differ from those provided, please consult NSK. 7 8

21 High-load ball screws for injection molding machine ejectors all screws exclusively designed for ejector mechanism contribute to the compact design of the device. Specifications Accuracy grade Ct7 of JIS (7) is applicable as the standard accuracy grade. Axial play Standard axial play: 0.0 mm or less Optional specs The nut shape can be adapted for tube push-out specs. Please consult NSK. More compact, high-load volume Compared with conventional ball screws (generally used with ejectors), these have achieved a higher load capacity. This means smaller ball screws, contributing to the compact design of the device. Grease splatter reduction An exclusive design for seal and ball groove has reduced grease leakage and splattering. Design Precautions When designing the shaft ends, one end of the screw shaft must have ball groove cut through to the shaft end or the ball groove root diameter must be dr or less (see dimension chart), otherwise the ball nut cannot be installed on the screw shaft. Outline view Xdrill (equally spaced) PCD W T Q (Oil hole) A D dr d Examples of down sizing Rolled ball screws Shaft diameter No. of circuits:.5 turns circuits Ca=. [kn] Shaft diameter downsized, but Ca: UP all screw in this spec Shaft diameter No. of circuits:.5 turns circuits Ca=4.6 [kn] Dimension chart L Unit [mm] Model No. asic load rating[kn] Shaft Root Effective ball all nut dimensions Lead dia. dia. turns Dynamic Static r d d r D A L W X Q T Circuits C a C 0a M6X M6X M6X M6X Note: All are right-hand screws.

22 NSKTAC Series of all Screw Support earings for High-Load Applications Standard Series and Special ore Diameter Series of all Screw Support earings for High-Load Applications NSKHPS Angular Contact Thrust all earings of all Screw Support earings for High-Load Drive Applications Axial load capacity has increased by.5 times compared with that of conventional bearings. High-capacity bearings used for supporting ball screws operating under high loads typically adopt largediameter steel balls in order to ensure sufficient high capacity and to reduce the number of rows of combinations. With the development and commercialization of the special bore diameter series, which has the same load rating as that of the standard series but with a smaller bore diameter, users can maintain equivalent high-capacity performance with a smaller diameter of screw shaft end without changing the number of rows. Please refer to pages 4 and 44 for applicable bearing tables. Extended bearing life and higher axial-load capacity - Limiting axial load has increased by.5 times compared with that of conventional bearings. - earing life has increased by. times compared with that of conventional bearings. Special bore diameter series facilitates downscaling of screw shaft end Easy handling by means of universal matching Extended bearing life and higher axial-load capacity Longer bearing life and higher axial load capacity have been achieved by optimization of the bearing s internal design, thus enabling the reduction in number of combined rows. Limiting axial load Conventional bearing New series bearing ore diameter (mm) Comparison of limiting axial load asic dynamic load rating Conventional bearing New series bearing ore diameter (mm) Comparison of basic dynamic load ratings The DD arrangement can be used instead of a DT arrangement. Special bore diameter series facilitates downscaling of screw shaft end The special bore diameter series is designed with an outer ring outside diameter and width that are the same as those of the standard series, but with a bore diameter that is smaller. Therefore, the dimension of the shaft end of the screw can be shortened while maintaining the same basic load rating. Standard series Special bore diameter series 60TAC0 - six rows 6 Formulation of earing Numbers Standard series Example: TAC 0 D T85 SU M PN5D TAC earing bore diameter earing type symbol Dimension symbol Internal design symbol earing bore diameter earing type symbol Dimension symbols Internal design symbol Cage symbol Arrangement symbol Preload symbol Accuracy symbol 0 D T85 SU M PN5D ore diameter (mm) Angular contact thrust ball bearing 0 : 0 series ; 0 : 0 series Contact angle 55 T85 : Polyamide resin cage SU: Universal matching for single row M : Standard preload Accuracy symbol Preload symbol Arrangement symbol Cage symbol PN5D:Standard accuracy (ISO class 5 equivalent) Three rows 60 Two rows Example: Reduced number of combined rows TAC60- - four rows 56 Example: mounting of special bore diameter series Special bore diameter series Example: TAC earing type symbol earing bore diameter Internal design symbol Cage symbol TAC 45 T85 SU M PN5D 45 - earing type symbol earing bore diameter Internal design symbol Cage symbol Arrangement symbol Preload symbol Accuracy symbol T85 SU M PN5D 60 Angular contact thrust ball bearing ore diameter (mm) Contact angle 55 T85 : Polyamide resin cage SU : Universal matching for single row M : Standard preload Accuracy symbol Preload symbol Arrangement symbol PN5D :Standard accuracy (ISO class 5 equivalent) 4 4

23 r r NSK all Screws for High-Load Drive NSKTAC Series of all Screw Support earings for High-Load Applications r r r r Multi-row combination calculations These have been calculated by multiplying the coefficients in the right table for preload coefficient, axial rigidity and starting torque. earing configuration rows rows 4 rows 5 rows DFD DFF DFT DFFD DFFF DFTD DFTT DFFT Preload coefficient Axial rigidity Starting torque φd φd r α Dynamic equivalent load Angular contact thrust ball bearings for equipment such as electric injection molding machines are subjected to extremely large axial loads (F a ) in comparison to radial loads (F r ). Therefore, the dynamic equivalent load P of the support bearing is obtained by the following formula regardless of the number of rows: P is 0.8 F r + F a r φd φd φd φd Standard series earing numbers oundary dimensions (mm) Dimensions (mm) Recommended amount of prepacked grease (cc) Contact angle Limiting speed (min ) d D r (min) r (min) d d D D Grease Mass (kg) Preload () (D and DF Arrangement (N) Axial rigity () (D and DF Arrangement (N/µm) Starting torque () (D and DF Arrangement (N m) asic dynamic load rating C a by number of rows sustaining F a Limiting axial load by number of rows sustaining F a 5TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D TAC0D row rows rows 4 rows 5 rows row rows rows 4 rows 5 rows Special bore diameter series earing numbers oundary dimensions (mm) Dimensions (mm) Recommended amount of prepacked grease (cc) Contact angle Limiting speed (min ) d D r (min) r (min) d d D D Grease Mass (kg) Preload () (D and DF Arrangement (N) Axial rigity () (D and DF Arrangement (N/µm) Starting torque () (D and DF Arrangement (N m) row asic dynamic load rating C a by number of rows sustaining F a rows rows 4 rows 5 rows row Limiting axial load by number of rows sustaining F a TAC TAC TAC TAC TAC TAC TAC rows rows 4 rows 5 rows all Screw Shaft Diameters and Recommended NSKTAC Series Shaft diameter (mm) Standard series Special bore diameter series Remarks:. Limiting speeds are based on the standard preload of each bearing. Also, the figures are free of the influence arrangement type.. earing bore of mm or more and TAC- indicates a figures of EL preload.. The starting torque figures indicate grease lubrication. 4. Permissible axial load equals 0.7 times of limiting axial load., 45 6 TAC0D TAC0D 60TAC0D TAC0D TAC0D TAC0D TAC5- TAC- TAC- TAC60- TAC- TAC- 4 44

24 NSK Roller Guides RA Series The RA series roller guides feature high-load capacity and high rigidity and help to preserve the working environment. This series is the culmination of NSK s analysis technology and tribology. Demand for preloaded rolling linear guides for high-load drive is now increasing. The RA series with high rigidity and a function for preserving a clean environment is one of the most suitable linear guides for high-load applications. High-load capacity The world s highest-load capacity, taking full advantage of NSK s analysis technology, ensures a long operating life. High rigidity The optimum size of the roller ensures high rigidity and supports more compact machinery. Specifications Roller Slide Types and Shapes Two types of roller slides are available in this series: a flange type and a square type. A compact, low-profile square type is now available. On the mounting hole of the flange type, the tapped part is used to fix the roller slide from the top surface, and the minor diameter can be used as a bolt hole from the bottom. This provides mounting from both directions, top and bottom. Roller slide length can be specified by the standard high-load type or special long, super-high load type. Fig. Square type (RA5, 0, 5, 0, 5, 45, 55, and 65) Roller slide shape code AN (High load) Highly dust-resistant design The high performance seals as standard equipment completely block the entry of foreign matter and maintain primary performance over the long time. Interchangeable series The interchangeable series of the guide rails and the roller slides are independently available in stock. Fig. Low-profile type (RA5, 5, 0, 5, 45, and 55) N (Super-high load) Roller slide shape code AL (High load) Optimal Design L (Super-high load) NSK executed a comprehensive, detailed performance simulation of roller guides by integrating its analysis technology and the tribology technology that the company had been developing over many years. Down to the dimensions and shapes of component details, we have attained an optimal design completely. Smooth motion by use of retaining pieces alanced four-directional iso-load specifications Fig. Flange type (RA5, 0, 5, 0, 5, 45, 55, and 65) Roller slide shape code EM (High load) GM (Super-high load) Example of roller slide deformation analysis Analysis example of contact pressure distribution of rollers Please refer to Cat. No. E8 for more details

25 Technical 技術データシート Data sheet Technical Data sheet Technical Data Sheet for NSK High-Load Drive all Screw Custom-made ball screw Company name: Section: Address: Date: Person in charge: Name of machine* : Electric injection molding machine; 0-ton capacity Application* : Drawing/rough sketch attached?: Yes No * Please specify capacity of the machine in case of injection molding machine or press. * If the application is injection molding machine, please indicate the axis. (Examples: injection axis and clamping axis). Use conditions Operating conditions Shaft rotation Moving nut Shaft rotation Moving shaft Nut rotation Moving nut Nut rotation Moving shaft Normal operation ack drive operation Oscillation Direction C-C T-T T-C C-T other of load* (Refer to figures below.) Lubricant Request for oil hole Grease rand name: High-load grease with an extreme pressure additive Degree of vibration / impact Mounting orientation Oil ( Maker: ) How to replenish NSK recommended Your request lubricant NSK sales office Clamping axis Smooth operation without impact Normal operation Operation associated with impact or vibration Horizontal Vertical (Indicate the direction of gravity.) Grease gun Automatic ( cm / cycles) Technical Data Sheet for NSK High-Load Drive all Screw. Load chart (If using multiple ball screws in an axis, fill out the axial load per ball screw.) Rotational speed N, min Speed V, mm/s Load F, kn ➀ ➁ ➂ ➃ Avg Time: t (s) Time: t (s) Necessity of seals Yes No NSK S necessary? NSK recommended Not necessary Avg. 00 Environment Temperature ( deg) Surface treatment Quantity in mass-production Particles / Yes (Size of particle: a) to 0., b) over 0. to 0., c) over 0., d) Ingredient: ) No particle Not required Low-temperature chrome plating Fluoride low-temperature chrome plating Other /Month /Year /Lot Quantity used per machine * Please specify loading direction code on the figures below. (Shaft fixed:, Main load: ) C-C (NSK recommended). Specifications Shaft diameter Nut model No. Special note / Requests f mm HTF -7.5-S Lead Effective turns of balls T-T (NSK recommended).5 mm Accuracy grade Direction of turn Ct7 right T-C Axial play Please calculate the life as a continuous operation based on. Load chart. Thread length / Overall shaft length pcs./machine C-T 0.0 or less mm max. 0 / ➀ ➁ ➂ ➃ ➄ ➅ ➆ ➇ ➈ ➉ Dynamic axial load (max.)*: Stroke in normal use: Cycle time: Rotational speed or Average speed N (min ) (mm) (s) V (mm/s) *If using multiple ball screws in an axis, fill out the axial load per ball screw. Time t (s) Total: Plan to conduct the endurance test of the ball screw? Actual data on the machine Axial load* F 00.0 Yes 0 Stroke St (mm) Total: Remarks Static axial load (max.)* (at 0 mm/s): Maximum stroke: 0( mm) Required life: 0( h or cycles) N/A Planning to check endurance (Date: From the middle of March 0 ) No (Reason: ) Endurance of the ball screw () Mounting accuracy, load conditions, and lubricating conditions are the main factors affecting the ball screw fatigue life. Therefore, we recommend evaluating the influence of those factors on actual use of your machines. () A temperature rise caused by operational and environmental conditions may reduce the effectiveness of lubricant