High performance metal disk coupling SERVOFLEX SFF (N)

Transcription

1 High performance metal disk coupling SERVOFLEX SFF (N)

2 Best design for the latest servo motor SERVOFLEX for feed shaft which introduce the high precision clamp method Coupling outer diameter, lineup for shaft diameter and rated torque are designed for the latest servo motor specifications and dimensions. It goes well with each manufacturer's the latest servo motors. Also, maximum.5 times rated torque compared to the company conventional model is achieved. It permits miniaturization of the coupling and reduces the moment of inertia. In addition, our unique technology had solved the problem of the clamp method which had been considered to be difficult to identify, precisely shaft centering is now realized. By adoption of the clamp method, installation time is drastically shortened. It's the metal disk coupling that can be used for high specifications of machine tools. *Compared to the conventional company products SFF model. SERVOFLEX SFF (N) MODEL 002 MIKI PULLEY SERVOFLEX

3 FULL LINEUP SFF- SS - N TYPE High-rigidity single element Rated torque to 600 N m Parallel offset misalignment mm Angular misalignment Axial displacement misalignment ±0.2 to ±0. mm Operational temperature - to Adapted to the RoHS Clamp bolt Material: Alloy steel for machine structural use Clamp hub Material: S45C or an equivalent Element material Metal disk: SUS4 Collar: S45C or an equivalent TORQUE THRUST BENDING RADIAL socket head cap screw Material: Alloy steel for machine structural use SFF- DS - N TYPE High-flexibility double element Rated torque to 600 N m Parallel offset misalignment 0. to 0. mm Angular misalignment (one side) Axial displacement misalignment ±0.4 to ±.6 mm Operational temperature - to Adapted to the RoHS Clamp bolt Material: Alloy steel for machine structural use Clamp hub Material: S45C or an equivalent Spacer Material: S45C or an equivalent Element material Metal disk: SUS4 Collar: S45C or an equivalent TORQUE THRUST BENDING RADIAL socket head cap screw Material: Alloy steel for machine structural use MIKI PULLEY SERVOFLEX 003

4 SERVOFLEX High precision clamping connection The number of mounting bolts has been reduced substantially. You can remarkable reduce mounting time. High rigidity and concentricity SERVOFLEX has high rigidity and excellent concentricity, resulting in a greatly improved finish on a workpiece. * Top row: Machined surface after using SERVOFLEX * Bottom row: Machined surface using jaw type coupling 004 MIKI PULLEY SERVOFLEX

5 SFF (N) MODEL High-rigidity metal disk flexible couplings A layered metal disk is rigid in the torsional direction and flexible in the parallel misalignment, angular, and axial direction. Torsional rigidity comparison of couplings Torsional rigidity 3 [N m/rad] Outer diameter φ Outer diameter φ Outer diameter φ SFF SS(N) SFC SA2 SFC DA2 Oldham Cross-slit Heli-cal Types of coupling No backlash No backlash, accurate shaft rotation, and precise control. Elastic (metal)coupling Metal disk :SERVOFLEX Elastic (rubber, plastic)coupling rubber, plastic compression, etc Correction coupling Oldham, pin bush, etc No backlash Pseudo backlash Backlash *These measurement results were calculated from actual experiments performed using MIKI PULLEY procedures and are not to be interpreted as guarantees of product performance. MIKI PULLEY SERVOFLEX 005

6 SERVOFLEX SFF SS (N) Single Element Type Specifications Rated torque [N m] Peak torque [N m] Parallel Misalignment Angular [ ] Axial Max. rotation speed [min - ] Torsional stiffness [N m/rad] Axial stiffness [N/mm] Moment of inertia [kg m 2 ] Mass [kg] SFF-0SS SFF-0SS SFF-0SS SFF-060SS SFF-00SS SFF-00SS SFF-00SS SFF-00SS SFF-090SS SFF-090SS SFF-0SS SFF-SS -N -2N -N -0N -N -0N -0N -0N -4N ±0.2 ±0.2 ±0.3 ±0.3 ±0.5 ±0.5 ±0.5 ±0.5 ±0.6 ±0.6 ±0.65 ± * Peak torque is vailid for both rotational direction, max. stress <= * Max. rotation speed does not take into account dynamic balance. * Torsional stiffness values given are calculated for the element alone. * The moment of inertia and mass are measured for the max. bore diameter. Dimensions K Clamp bolt M L LF S Clamp bolt M2 φd φn φ φ φn2 Min. Max. Min. Max. D L N N2 LF S K M M2 Quantity - Tightening Quantity - Tightening Nominal dia. torque [N m] Nominal dia. torque [N m] SFF-0SS SFF-0SS SFF-0SS SFF-060SS SFF-00SS SFF-00SS SFF-00SS SFF-00SS SFF-090SS SFF-090SS SFF-0SS SFF-SS -N -2N -N -0N -N -0N -0N -0N -4N M 2-M 2-M 2-M 2-M 2-M 2-M 2-M 006 MIKI PULLEY SERVOFLEX

7 Standard bore diameters Standard bore diameters SFF-0SS -N SFF-0SS -2N SFF-0SS -N SFF-060SS SFF-00SS SFF-00SS -0N SFF-00SS -N SFF-00SS -0N SFF-090SS -0N SFF-090SS -0N SFF-0SS -4N SFF-SS How to Place an Order SFF-00SS-BK-BK-0N Size Type S: Single element Material S: Steel Bore dia. (Small dia.) Bore dia. (Large dia.) Nominal rated torque (Refer to the specifications) Affixing method B: Clamp Mating shaft tolerance blank: h, K: k6, M: m6, J: j6, S: To download CAD data or product catalogs WEB CODE A002 00

8 SERVOFLEX SFF DS (N) Double Element Type Specifications Rated torque [N m] Peak torque [N m] Parallel Misalignment Angular [ ] Axial Max. rotation speed [min - ] Torsional stiffness [N m/rad] Axial stiffness [N/mm] Moment of inertia [kg m 2 ] Mass [kg] SFF-0DS SFF-0DS SFF-0DS SFF-060DS SFF-00DS SFF-00DS SFF-00DS SFF-00DS SFF-090DS SFF-090DS SFF-0DS SFF-DS -N -2N -N -0N -N -0N -0N -0N -4N (On one side) (On one side) (On one side) (On one side) (On one side) (On one side) (On one side) (On one side) (On one side) (On one side) (On one side) (On one side) ±0.4 ±0.4 ±0.6 ±0.6 ±.0 ±.0 ±.0 ±.0 ±.2 ±.2 ±.3 ± * Peak torque is vailid for both rotational direction, max. stress <= * Max. rotation speed does not take into account dynamic balance. * Torsional stiffness values given are calculated for the element alone. * The moment of inertia and mass are measured for the max. bore diameter. Dimensions K Clamp bolt M S LF L LP Clamp bolt M2 φd φn φ φd3 φ φn2 Min. Max. Min. Max. D L N N2 LF LP S d3 K M M2 Quantity - Tightening Quantity - Tightening Nominal dia. torque [N m] Nominal dia. torque [N m] SFF-0DS SFF-0DS SFF-0DS SFF-060DS SFF-00DS SFF-00DS SFF-00DS SFF-00DS SFF-090DS SFF-090DS SFF-0DS SFF-DS -N -2N -N -0N -N -0N -0N -0N -4N M 2-M 2-M 2-M 2-M 2-M 2-M 2-M 00 MIKI PULLEY SERVOFLEX

9 Standard bore diameters Standard bore diameters 型式 SFF-0DS -N SFF-0DS -2N SFF-0DS -N SFF-060DS SFF-00DS SFF-00DS -0N SFF-00DS -N SFF-00DS -0N SFF-090DS -0N SFF-090DS -0N SFF-0DS -4N SFF-DS How to Place an Order SFF-00DS-BK-BK-0N Size Type D: Double element Material S: Steel Bore dia. (Small dia.) Bore dia. (Large dia.) Nominal rated torque (Refer to the specifications) Affixing method B: Clamp Mating shaft tolerance blank: h, K: k6, M: m6, J: j6, S: To download CAD data or product catalogs WEB CODE A

10 SERVOFLEX SFF (N) Items Checked for Design Purposes Precautions for handling SFF (N) models come pre-assembled. Couplings are assembled at high accuracy using a special mounting jig to ensure accurate concentricity of left and right internal diameters. Take extra precautions when handling couplings, should strong shocks be given on couplings, it may affect mounting accuracy and cause the parts to break during use. () Couplings are designed for use within an operating temperature range of - to. Although the couplings are designed to be waterproof and oilproof, do not subject them to excessive amounts of water and oil as it may cause part deterioration. (2) Handle the element with care as it is made of a thin stainless steel metal disk, also making sure to be careful so as not to injure yourself. (3) Do not tighten up clamp bolts until after inserting the mounting shaft. Mounting () Check that coupling clamp bolts have been loosened and remove any rust, dust, oil residue, etc. from the inner diameter surfaces of the shaft and couplings. (Use a waste cloth, etc. to wipe away oil residue or an oil remover as needed.) (2) Be careful when inserting the couplings into the shaft so as not to apply excessive force of compression or tensile force to the element. (3) Make the length of the coupling inserted onto the motor shaft connect to the shaft for the entire length of the clamp hub of the coupling (LF dimension) as shown below, alternately tighten the two clamp bolts, and provisionally tighten enough that the coupling cannot be manually rotated. LF LF SFF-0SS/DS SFF-0SS/DS SFF-0SS/DS SFF-060SS/DS SFF-00SS/DS SFF-00SS/DS SFF-00SS/DS SFF-00SS/DS SFF-090SS/DS SFF-090SS/DS SFF-0SS/DS SFF-SS/DS -N -2N -N -0N -N -0N -0N -0N -4N LF dimension (4) Hold a dial gauge against the outer diameter of the clamp hub on the motor shaft side (the surface processed simultaneously with the inner diameter), and then tighten the two clamp bolts while turning the motor shaft by hand and adjusting the difference in the runout values at A and B in the figure below is mm or less (and as close to 0 as possible). A GOOD NO GOOD B 0 MIKI PULLEY SERVOFLEX

11 (5) Alternately fasten the two clamp bolts as you adjust them, and finish by tightening both bolts to the appropriate tightening torque of the following table, using a calibrated torque wrench. Since it is fastened by two clamp bolts, tightening one bolt before the other will place more than the prescribed axial force on the bolt tightened first when the other bolt is tightened. Be sure to tighten them alternately, a little at a time. Nominal clump bolt diameter Tightening torque [N m] M4 M5 M6 M M (6) Mount the motor, to which the coupling has already been mounted, on the body of the machinery. At that time, adjust the motor mounting position (centering location) while inserting the coupling onto the driven shaft (a feed screw or the like), being alert to undue forces on the element such as compression or pulling. () Make the length of the driven shaft (feed screw or the like) inserted into the coupling connect to the shaft for the length of the LF dimension (described above), alternately tighten the two clamp bolts, and provisionally tighten enough that the coupling cannot be manually rotated. () In addition, keep the dimension between clamp hub faces (the S dimension in the diagram) to within the allowable misalignment of the axial displacement with respect to a reference value. Note that the tolerance values were calculated based on the assumption that both the level of parallel misalignment and angular deflection are zero. Adjust to keep this value as low as possible. S Removal () Check to confirm that there is no torque or axial load being applied to the coupling. There may be cases where a torque is applied to the coupling, particularly when the safety brake is being used, for example. Make sure to verify that this is not occurring before removing parts. (2) Release the fastening to the shaft by sufficiently loosening all clamp bolts. Grease has been applied to the clamping bolts, so do not remove them all the way. Since two clamp bolts were used to fasten to the shaft, loosening only one will decrease the axial force of the other clamp bolt. Note that this is not the bolt loosening that occurred during operation. Compatible torque driver and wrench Nominal bolt diameter M4 M5 M6 M M Tightening torque [N m] Torque driver or wrench NLTDK N0LTDK bit or head SB 3mm SB 4mm Coupling size N2LCK 2HCK 5mm N4LCK N900SPCK N m 4HCK 6mm 900HCK mm Differences in torsional stiffness due to element shape Elements used by SFF (N) models may be either square or hexagonal. Since torque is transmitted by placing bolts at each vertex and coupling the hubs to each other via the element, torsional stiffness is higher in couplings that use hexagonal elements, at the expense of some flexibility. Choose your element shape accordingly. Element shape SFF-0SS/DS SFF-0SS/DS SFF-0SS/DS SFF-060SS/DS SFF-00SS/DS SFF-00SS/DS SFF-00SS/DS SFF-00SS/DS SFF-090SS/DS SFF-090SS/DS SFF-0SS/DS SFF-SS/DS -N -2N -N -0N -N -0N -0N -0N -4N S dimension SFF-0SS/DS SFF-0SS/DS SFF-0SS/DS SFF-060SS/DS SFF-00SS/DS SFF-00SS/DS SFF-00SS/DS SFF-00SS/DS SFF-090SS/DS SFF-090SS/DS SFF-0SS/DS SFF-SS/DS -N -2N -N -0N -N -0N -0N -0N -4N Square Square Square Square (9) Adjust runout using the same procedure as for the motor shaft side, and then finish by tightening the clamp bolts to the appropriate tightening torque. () To protect against initial loosening of the clamp bolt, we recommend operating for a set period of time and then retightening to the appropriate tightening torque. MIKI PULLEY SERVOFLEX 0

12 SERVOFLEX SFF (N) Items Checked for Design Purposes Points to consider regarding the feed screw system When the torsional natural frequency of the overall feed screw system is 0 to 0 Hz or less, gain adjustment of the servo motor may cause the servo motor to oscillate. Oscillation in the servo motor during operation can cause problems particularly with the overall natural frequency and electrical control systems of the feed screw system. In order for these issues to be resolved, the torsional stiffness for the coupling and feed screw section and the moment of inertia and other characteristics for the system overall will need to be adjusted and the torsional natural frequency for the mechanical system raised or the tuning function (filter function) for the electrical control system in the servo motor adjusted during the design stage. Please contact MIKI PULLEY with any questions regarding servo motor oscillation. How to find the natural frequency of a feed screw system () Select a coupling based on the nominal and maximum torque of the servo motor. (2) Find the overall natural frequency, Nf, from the torsional stiffness of the coupling and feed screw, κ, the moment of inertia of driving side, J, and the moment of inertia of driven side, J2, for the feed screw system shown below. Motor Coupling Table Feed screw Selection () Find the torque Ta applied to the coupling using the output capacity, P, of the driver and the usage speed, n. P [kw] Ta [N m] = 95 n [min - ] (2) Determine the factor K from the load properties, and find the corrected torque, Td, applied to the coupling. Td [N m] = Ta [N m] K (see below) Load properties Constant Vibration : Small Vibration : Medium Vibration : Large K For servo motor drive, multiply the maximum torque, Ts, by the usage factor K =.2 to.5. Td [N m] = TS [N m] (.2 to.5) (3) Set the size so that the rated coupling torque, Tn, is higher than the corrected torque, Td. Tn [N m] Td [N m] (4) Check that the mount shaft is no larger than the maximum bore diameter of the coupling. * Contact MIKI PULLEY for assistance with any device experiencing extreme periodic vibrations. Bearing Nf = K 2π J + J2 Nf:Overall natural frequency of a feed screw system [Hz] κ:torsional stiffness of the coupling and feed screw [N m/rad] J:Moment of inertia of the driver [kg m²] J2:Moment of inertia of the follower [kg m²] J J2 κ '5.06--MP-SFFN(eu)-00A