Ball Screw Assemblies eline. The Drive & Control Company

Transcription

1 Ball Screw Assemblies eline The Drive & Control Company

2 2 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) Linear Motion Technology Ball Rail Systems Standard Rail Systems Super Rail Systems Rail Systems with aluminum Runner Block High-speed Rail Systems Corrosion-resistant Rail Systems Wide Rail Systems Rail Systems with integrated Measuring System Clamp and Brake Units for Ball Rail Systems Racks for Ball Rail Systems Miniature Rail Systems Cam Roller Guides Roller Rail Systems Standard Rail Systems Wide Rail Systems High-load Rail Systems Rail Systems with integrated Measuring System Clamp and Brake Units for Roller Rail Systems Racks for Roller Rail Systems Linear Bushings and Shafts Linear Bushings, Linear Sets Shafts, Shaft Supports, Shaft Support Blocks Ball Transfer Units Traditional Technical Parts Ball Screw Assemblies Linear Motion Systems Linear Motion Slides Ball Screw Toothed Belt Linear Modules Ball Screw Toothed Belt Gear Rack Pneumatic Drive Linear Motor Compact Modules Ball Screw Toothed Belt Linear Motor Multi-axis Motion System Precision Module Ball Screw Ball Rail Tables Ball Screw Linear Motor Controllers, Motors, Electrical Accessories Electric Cylinders

3 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 3 Product Overview 4 Technical Data 6 with Screw-in Single Nut ZEV-E-S Single fixed stock, fixed length 10 with Single Nut with Flange FBZ-E-S Single fixed stock, fixed length 12 with Screw-in Single Nut ZEV-E-S Fixed stock, customer-specified length 14 with Single Nut with Flange FBZ-E-S Fixed stock, customer-specified length 16 Angular-contact thrust bearing unit with Groove nut, LAL series 18 Grooved Ball Bearing with Safety Ring, LAD series 20 Lubrication 21 Mounting 22

4 4 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) Product Overview Product Background eline Ball Screws are available from stock as complete assemblies, with screw-in or flanged nuts. The pre-finished machining is easily combined with the fixed bearing LGL (support block with bearing) as a complete package. The eline products can simplify the choices for many customer-specified transport applications. The part number specification and ordering process for new applications can also be handled more effectively. Relaxed tolerances provide very economical linear motion solutions. Every nut is assembled with clearance. The flanged nut comes standard with seals; the screw-in version offers seals as an option. Cost savings are always a priority with the eline. The load capacity of the support bearing is critical. By friction welding the bearing forward, we were able to enlarge smaller screw diameters and increase the load bearing capacity.

5 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 5 Advantages High axial load capacity From stock Flanged or screw-in nuts With seals, if specified Bearing and slotted lock nut optional Angular-contact thrust bearing with Nut, LAL series The end bearing LGL with angular-contact ball bearing in an X arrangement makes an ideal accessory. Grooved Ball Bearing with Safety Ring, LAD series Storage with grooved Ball Bearings High load capacity Very easy mounting with the flanged housing Corrosion-resistant housing Seals provide protection from contaminants Simple preload of the fixed bearing Maintenance free for most application due to the large lubricant reservoir with initial greasing Economical turnkey solutions made easy.

6 6 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) Technical Data Speed v max = 1 m/s Dependant of size and lead Acceleration a max = 20 m/s 2 Dependant of size and lead Temperature Stability t = 0 to 80 C Temperature of surrounding environment Seal come with seals, if required. Horizontal Assembly Calculation (In connection with the corresponding direction) F m w mt F 1 =(m t + m w ) a + F m t = Table mass (N) m w = Work piece mass (N) a = Acceleration (m/s 2 ) Calculation of the Bearing Load F eq =F 1 k f F eq = Equivalent load k f = Working factors Recommended Operating Factors k f Operating Factors 0.8 Application KGT with manual operation 1.0 Clean environment applications 2.0 Secondary Axis for machine tools 4.0 Dirty environment applications To determine operational performance, calculate the relationship of F eq /C. With this value, you can read the operational performance and relubrication data in the following diagrams.

7 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 7 Operational Performance eline Ball Screw Assemblies P = 5 P = 10 50, ,000 Operational Performance (km) 5,000 10, , Operational Performance Relubrication F eq /C (Load /Dynamic Load) Example: An eline Ball Screw with 10 mm lead with 15% dynamic load results in an operational performance of approximately 1500 km. Relubricate every 500 km. Relubrication every 50 x 10 6 U. P = 10 every 500 km P = 5 every 250 km

8 8 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) Technical Data Acceptance Conditions and Tolerance Grades Permissible travel deviation similar to DIN , Part 3 and ISO Symbol definitions (excerpt): l 0 = Nominal travel l 1 = Thread length l 0 = Travel deviation l u = Useful travel l e = Excess travel e p = Tolerance for actual mean travel deviation n up = Permissible travel variation within useful travel l u Ball screw with precision rolled screw SN-R l 1 l e l u p l e l 0 e p n 300p = n 2pp = Permissible travel deviation within 300 mm travel Permissible travel deviation within 1 revolution 0 Dl Subindices: p = Permissible a = Actual e p Maximum permissable path deviation e p Useful e p T9 e p T10 (µm) (µm) e p = 2 l u ν P ν 300p = 210 µm Excess travel l e l e = 2 Recommended overrun for the design

9 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 9 Runouts and location deviations based on DIN , Part 3 and ISO Radial runout t 5 of the outer diameter of the ball screw shaft over the length l 5 used to determine the straightness in relation to AA. l5 l5 l5 t 5p AA l 5 t 5p in µm for l 5 above up tolerance grade to A 2 l 1 A 2 t 5p l5 l5 A A t 5 max l 1 / t 5max in µm for l 1 4l 5 above up to tolerance grade Radial runout t 6 of the bearing diameter in relation to AA for l 6 l. Where l 6 > l then t 6a t 6a l 6a l t 6p AA A 2 A Nominal diameter Ref. length l t 6p in µm for l 6 l tolerance grade above up to l 6 Coaxial deviation t 7 of the journal diameter of the ball screw shaft in relation to the bearing diameter for l 7 l. Where l 7 > l then t 7a t 7a l 7a l C t 7p C bearing seat Nominal diameter Ref. length l t 7p in µm for l 7 l tolerance grade above up to l 7 Axial runout t 8 of the shaft (bearing) face of the ball screw shaft in relation to the bearing diameter. t 8p C d C F Nomnial diameter t 8p in µm tolerance grade above up to bearing seat

10 10 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) eline BSA with Screw-in Single Nut ZEV-E-S, fixed length Rexroth mounting dimensions Single fixed bearing With seals With backlash 0.1 mm Screw tolerance class T9 or T10 Ordering Code x P x D w - i 12 x 5R x x 10R x x 5R x x 10R x x 5R x 3-4 Tolerance class Length L Total L Screw Part Numbers T R T R T R T R T R T R T R T R T R T R = Nominal diameter P = Lead (R = right, L = left) D W = Ball diameter i = No. of turns

11 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 11 Undercut Form F DIN 509 Threat undercut DIN 76 short Undercut Form E DIN 509 D 8 Hole for hook wrench D 4 L 7 Lube hole Screw End Form 81 D 2 h7 G 1 D 1h6 L 2 LG 1 L 1 L 15 LMut L ZF L Gew L Ges DR DF D 1 D w d2 d1 G1 Screw End Form 83 friction-welded L ZF L R L F Nut Dimensions (mm) Backlash P D 1 D 4 D 8 G 1 L Nut L 7 L 15 h10 ± M20 x M20 x M26 x M26 x M35 x Screw Form Dimensions (mm) P d 1 d 2 L ZF D R L R D F L F D 1 L 1 D 2 L 2 G 1 LG M12x M12x M12x M12x M12x1 18 Basic load rating max. Speed dyn. C stat. C 0 v max P (N) (N) (m/min)

12 12 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) eline BSA with Single Nut with Flange FBZ-E-S, fixed length Rexroth mounting dimensions Single fixed bearing With seals With backlash 0.1 mm Screw tolerance class T9 or T10 Ordering Code x P x D w - i 20x5Rx3-4 25x5Rx x10Rx3-4 32x5Rx3,5-4 32x10Rx3,969-5 Tolerance class Length L Total L Screw Part Numbers T R T R T R T R T R T R T R T R T R T R = Nominal diameter P = Lead (R = right, L = left) D W = Ball diameter i = No. of turns

13 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 13 Screw End Form 81 Undercut Form F DIN 509 Plastic recirculation cap Thread undercut DIN 76 short Undercut Form E DIN 509 Lube hole L 10 D 7 S D 6 j D 2 h7 G 1 D 1h6 D 1 D1 L 5 L 3 L 4 L D w d2 d1 +0,7 D 1 0,1 0,05 D 5 L 2 LG 1 L 1 6x60 Plastic recirculation cap LZF LGew LGes Nut Dimensions (mm) P D 1 D 5 D 6 D 7 L L 3 L 4 L 5 L 10 S ϕ ±0.5 ( ) M M M M M6 30 Screw Form Dimensions (mm) P d 1 d 2 L ZF D 1 L 1 D 2 L 2 G 1 LG M12x M15x M15x M20x M20x1 15 Basic load rating max. Speed dyn. C stat. C 0 v max P (N) (N) (m/min)

14 14 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) eline BSA with Screw-in Single Nut ZEV-E-S, customer-specified length Single fixed bearing With seals With backlash 0.1 Screw tolerance class T9 or T10 L Gew = L Ges L ZF L ZL Note: Observe overrun (2 ) Ordering Code = Nominal diameter P = Lead (R = right, L = left) D W = Ball diameter i = No. of turns x P x D w - i 12 x 5R x x 10R x x 5R x x 10R x x 5R x 3-4 Tolerance class Length L Total max L Screw max Part Numbers T R T R T R T R T R T R T R T R T R T R When ordering, please ensure that part numbers and and desired total length L Ges are given. (R2540 xx2 xx, xxxx mm). L Ges

15 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 15 Undercut Form F DIN 509 Threat undercut DIN 76 short Undercut Form E DIN 509 D 8 Hole for hook wrench D 4 L 7 Lube hole Undercut Form E DIN 509 Snap ring groove per DIN 471 Screw End Form 81 L 6 LS 1 H13 G 1 L 2 LG 1 L 1 L 15 LMut L ZF L Gew L Ges D w d2 d1 DR DF D 2 h7 D 1h6 D 1 G1 D 3 j6 S 1ST1 L ZL Screw End Form 83 friction-welded L ZF L R L F Nut Dimensions (mm) Backlash P D 1 D 4 D 8 G 1 L Nut L 7 L 15 h10 ± M20 x M20 x M26 x M26 x M35 x Screw Form Dimensions (mm) P d 1 d 2 L ZF D R L R D F L F D 1 L 1 D 2 L 2 G 1 LG 1 D 3 L ZL L 6 S 1 ST1 LS M12x h M12x h M12x h M12x h M12x h Basic load rating max. Speed dyn. C stat. C 0 v max P (N) (N) (m/min)

16 16 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) eline BSA with Single Nut with Flange FBZ-E-S, customer-specified length Single fixed bearing With seals With backlash 0.1 Screw tolerance class T9 or T10 L Gew = L Ges L ZF L ZL Note: Observe overrun (2 ) Ordering Code = Nominal diameter P = Lead (R = right, L = left) D W = Ball diameter i = No. of turns x P x D w - i 20 x 5R x x 5R x x 10R x x 5R x 3, x 10R x 3,969-5 Tolerance class Length L Ges max L Gew max Part Numbers T R T R T R T R T R T R T R T R T R T R When ordering, please ensure that part numbers and and desired total length L Ges are given. (R2540 xx2 xx, xxxx mm). L Ges

17 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 17 Screw End Form 81 Undercut Form F DIN 509 Threat undercut DIN 76 short Undercut Form E DIN 509 Lube hole Plastic recirculation cap L 10 L 6 Undercut From E DIN 509 LS 1 H13 Snap ring groove per DIN 471 D 7 S D 2 h7 G 1 D 1h6 D 1 D1 L 5 L 3 L 4 L D w d2 d1 D 5 +0,7 D 3 j6 S 1ST1 D 1 0,1 0,05 D 6 j 6x60 L 2 LG 1 L 1 Plastic recirculation cap LZF LGew L ZL LGes Nut Dimensions (mm) P D 1 D 5 D 6 D 7 L L 3 L 4 L 5 L 10 S ϕ ±0.5 ( ) M M M M M6 30 Screw Form Dimensions (mm) P d 1 d 2 L ZF D 1 L 1 D 2 L 2 G 1 LG 1 D 3 L ZL L 6 S 1 ST1 LS M12x h M15x h M15x h M20x h M20x h Basic load rating max. Speed dyn. C stat. C 0 v max P (N) (N) (m/min)

18 18 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) Angular-contact thrust bearing with nut, LAL series Works both sides, screw-on type, for cost-effective assembly for diameter = 12 to 25 The bearing consists of: Angular-contact thrust bearing LGL Locknut NMG series for diameter = 32 Ordering Code Part Numbers x P 12 x 5/10 R x 5/10 R x 5 R x 5/10 R x 10 R

19 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 19 for diameter = 12 to 25 n n D d m A 2 D d m A 2 B H d 2 A 1 Ø0.2 for diameter = 32 B H d 2 Ø0.2 A 1 Dimensions (mm) Weight P d D A 1 A 2 n m H B d 2 ( kg) 12 5/ / / Basic load rating dyn. C stat. C 0 P (N) (N) 12 5/ / /

20 20 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) Grooved Ball Bearing with safety ring, LAD series The bearing consists of: Grooved ball bearing DIN RS Safety Ring DIN 471 (2 Pieces) Ordering Code Part Numbers x P 12 x 5/10 R x 5/10 R x 5 R x 5/10 R x 5/10 R B D d Dimensions (mm) Basic load rating (axial) Complete Weight x P d D B dyn. C stat. C 0 (N) (N)(kg) 12 x 5/ x 5/ x x 5/ x 5/ Compatible for eline Ball Screw Assemblies with fixed bearings

21 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 21 Lubrication Relubrication for NLGI 2 grease The nut has to be lubricated with lubricant via the lube port before the ball screw is started. The relubrication is valid for Ball Screw Assemblies with seals. Relubrication quantity of grease (g) Single nut, precision-rolled screw R x P x D w -i FBZ-E-S ZEV-E-S 12 x 5R x x 10R x x 5R x x 10R x x 5R x x 5R x x 10R x x 5R x x 10R x Oil lubrication Grease lubrication The influence of the temperature on the performance of the ball screw is very significant, as the thermal expansion of the ball screw interferes with the positioning accuracy of the assembly. One of the advantages of oil lubrication over grease lubrication is therefore the minimized heat build-up of the ball screw, particularly at high speeds. As a rule, commercially available mineral base oils used for ball bearings are suitable. The necessary viscosity depends on the speed, temperature and load conditions of the respective application (see DIN 51501, 51517, and GfT Worksheet 3). Oils ranging from ISO VG 68 to approx. ISO VG 460 are used in practice. The high viscosity grades (e.g. ISO VG 460) should be preferred in general and particularly for slow running screws. A maximum relubrication interval of up to 10 operating hours can be attained with small quantities from the table along side. The advantage of grease lubrication is that the ball screw can run long distances on one supply of grease. As a result, a lubricating system is not required in many cases. The amount of grease used should fill the nuts to approximately half of their capacity. All commercially available ball bearing lubricating greases may be used. Read the lubricant manufacturer s specifications carefully! Never use greases with solid lubricant component (e.g. graphite or MoS 2 ). Greases in accordance with DIN K2K and, for higher loads, KP2K of NLGI Class 2 according to DIN are recommended for the longest possible lubrication intervals. Tests have proven that greases of NLGI Class 00 achieve only about 50% of the running performance of Class 2 greases at high loads. The lubrication interval depends on many factors such as the degree of contamination, operating temperature, load, etc. The following values can thus serve only as a guideline. Tapered grease nipple The Ball Screw Assemblies nut is to be lubricated via the lubrication port with grease before operation start-up. 8 M6 Part Number R

22 22 Bosch Rexroth Corp. Linear Motion and Assembly Technologies eline BSA R310A 3314 ( ) Mounting Condition as delivered Rexroth Ball Screw Assemblies are normally lubricated with NLGl 2 grease when specified. This initial lubrication allows for relubrication using either oil or grease. If you use a different type of lubrication, please ensure that the other lubricant can be mixed. In special cases, you can specify a corrosionpreserved Ball Screw Assembly. Important: The selected lubricant must be in the nut before the machine is started. Cleaning: Various cleaning agents can be used to degrease and wash the assembly: Aqueous cleaning agents Organic cleaning agents Immediately after cleaning, thoroughly dry all parts, then apply a preservative coating or anti-corrosion oil. In all cases, take care to observe the appropriate legal regulations (environmental protection, health and safety at work, etc.) as well as the specifications for the cleaning agent (e.g. handling). Storage Nut mounting Ball screw assemblies are high-quality systems that must be treated with due care. In order to prevent damage and contamination, the elements should not be removed from the protective wrapping until immediately before installation. Once they have been removed from the packaging, they must be set down on V-shaped cradles. Single nut with standard backlash Single nut with reduced backlash The nut unit may only be mounted using a mounting arbor. The outer diameter of the arbor should be approx. 0.1 mm smaller than the root diameter of the screw. In most cases, the transport arobor on which the nuts are delivered may be used to mount the nut. The end of the screw thread must be chamfered in order to prevent damage to the seal and the internal components of the nut unit. The various mounting steps are described below. Proceed in reverse order when removing the nut from the screw. Take particular care not to damage the nut, screw or internal components, as this could result in the premature failure of the ball screw assembly. Mounting arbor Dimensions (mm) x P L D i D a 12 x 5/ x 5/ x x 5/ x 5/ D i D a L

23 R310A 3314 ( ) eline BSA Linear Motion and Assembly Technologies Bosch Rexroth Corp. 23 Mounting steps The nut is to be mounted as follows: Remove the rubber ring from one end of the mounting arbor. Installation in the Machine It is not normally necessary to remove the preservative coating before installation. If the ball screw is contaminated it must first be cleaned (see Cleaning ) and reoiled Push the nut unit into the mounting bore, taking care to avoid any impacts or misalignment. Tighten the mounting screws using a torque wrench if necessary. Maximum tightening torque for the steel/steel material pairing (R m 370 N/mm 2 ), see table. Push the mounting arbor with nut until it engages with the end of the thread. The arbor must make contact with axial clearance. Carefully turn the nut unit onto the thread, applying only light axial pressure. Steel/steel material pairing Screw diamater Tightening torque (Nm) strength class to DIN ISO 898: (mm) M M M M M M M Remove the arbor only when the nut unit is fully located on the screw thread. For the steel/aluminum and aluminum/aluminum material pairings (R m 280 N/mm 2 ), the maximum tightening torques specified in the follow table apply. When screwing into aluminum, the length of thread engagement should be at least 1.5 times the screw diameter. Steel/aluminum and aluminum/ aluminum material pairing Screw diamater Tightening torque (Nm) strength class to DIN ISO 898: (mm) M M M M M M M

24 Bosch Rexroth Corporation Linear Motion and Assembly Technologies South Lakes Drive Charlotte, NC Telephone (800) Facsimile (704) Bosch Rexroth Corporation Corporate Headquarters 5150 Prairie Stone Parkway Hoffman Estates, IL Telephone (847) Facsimile (847) Bosch Rexroth Corporation Industrial Hydraulics 2315 City Line Road Bethlehem, PA Telephone (610) Facsimile (610) Bosch Rexroth Corporation Electric Drives and Controls 5150 Prairie Stone Parkway Hoffman Estates, IL Telephone (847) Facsimile (847) Bosch Rexroth Corporation Pneumatics 1953 Mercer Road Lexington, KY Telephone (859) Facsimile (859) Bosch Rexroth Corporation Mobile Hydraulics 1700 Old Mansfield Road Wooster, OH Telephone (330) Facsimile (330) Printed in the United States R310A 3314