Ball screw thread processing technology

September 26, 2021

Screw thread processing route selection
1. Screw thread processing route selection The thread of hardened long screw and Ball Screw usually has to be machined 2 to 4 times to meet the requirements of precision, tooth profile and surface quality. Avoid local burns and tooth distortion caused by "under-grinding" and "over-grinding" and "over-grinding". Table 7 ̈
Several screw thread routing routes to account for the above factors.

2. Factors affecting the lead (pitch) in thread grinding (1) The cause of the cycle error The so-called cycle error. The Trapezoidal Thread Screw refers to the helical axial error ΔL2 in any 2 丌 arc. The ball screw refers to the amount of change V2 in the arc of 2 兀. . The reasons for this are as follows:
1 The movement precision of the thread grinding machine from the workpiece main shaft to the nut screw drive chain, including the radial runout and axial sway of the headstock main shaft and the tip, the installation error and the motion error of the gear pair and the worm gear pair.
2 The installation error of the workpiece, the cylindricity of the center hole and the outer circumference of the thread, and the bending oscillation of the screw.
3 axial grinding of the nut grinder of the thread grinder and the influence of the cycle error of the nut screw on the workpiece.
4 imported Bearing machine tool, a fixture, a grinding wheel component, a dynamic stiffness of the workpiece system.
(2) Reasons for non-asymptotic local error This type of error refers to △P, △L25, △L100 for Trapezoidal Thread screws.
△L300, for the ball screw, it means V300, V. (△L25, △L100, △L 300 are thread lengths of 25mm, 100mm,
Axial tolerance of the spiral within 300 mm, V (four), V. It is the amount of stroke variation within the thread length of 300 mm and the effective length). The reasons are as follows:
1 The mechanical correction mechanism of the thread grinder is out of order, the pitch correction gauge is improperly adjusted or the scale is deformed.
2 The influence of the local error of the nut of the thread grinder and the partial wear of the nut screw.
3 Thread grinder table linearity error, smooth running and crawling along the bed.
4 The workpiece screw material is uneven, the hardness is not uniform after heat treatment, and there are “soft belt” and “hard point”.
5 The temperature control in the constant temperature room is not accurate, and the temperature fluctuation exceeds the allowable range during the final refining process.
6 The error of the previous process in the process of importing bearings is repeated.
Partial damping of the 7-thread grinding drive chain system.
8 outside interference.
(3) Reasons for generating asymptotic full-length cumulative error This type of error refers to e for a ball screw and ΔL for a trapezoidal thread screw. △ PL. (L. is the effective itinerary). The reasons for this are as follows:
1 thread grinding machine drive chain error, the theoretical pitch of the thread exchange hanging wheel and the actual pitch error.
2 The thermal deformation of the bed and the worktable, the machine nut screw and the workpiece screw are not in sync with the thermal deformation. ,
3 The influence of the cumulative error of the imported bearing machine nut screw pair on the workpiece.
4 The grinding wheel wears too fast during the one-pass feed of the grinding thread.
5 The cumulative error of the previous process is repeated during the process.
Rough thread (correction thread)
(ball screw with medium frequency quenching) a coarse grinding thread (single wire grinding wheel) half fine grinding thread a fine grinding thread
CNC cyclone milling (correcting thread) - medium frequency quenching (cNc) - rough grinding thread (single or multi-line grinding wheel) half finishing thread a fine grinding thread (('BN)
Hardened (ball screw for medium frequency quenching)
One thread coarse grinding groove (single and multi-line grinding wheel)
Half-finishing thread-finishing threaded rod hardened (ball shaft with medium frequency quenching) a high-speed thread (hard alloy knife)
a rough grinding thread, a fine grinding thread roughing or a cyclone milling thread (correcting thread)
One along the raceway thread groove, medium frequency quenching, one coarse grinding thread, one half fine grinding thread, one fine grinding thread

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