On-machine compensation method for large gear hobbing pitch error based on harmonic decomposition

A technology of tooth pitch error and compensation method, which is applied in the direction of metal processing machinery parts, metal processing, metal processing equipment, etc., can solve the problems of large gear mass, difficult repeated clamping, troublesome operation, etc., and achieves low cost and easy operation , the effect of easy operation

Active Publication Date: 2020-07-28
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above patents are all about the compensation of the system error of the gear hobbing machine tool. By measuring various system errors of the gear hobbing machine tool, and then reducing each error, so as to reduce the processing error and realize the compensation of the gear processing error. This method exists The problem is: due to the need for real-time monitoring and measurement of the error source, the operation is troublesome and the cost is high. For the characteristics of large gears with large mass, large diameter, and difficult repeated clamping, the traditional geometric error compensation method is no longer applicable

Method used

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  • On-machine compensation method for large gear hobbing pitch error based on harmonic decomposition
  • On-machine compensation method for large gear hobbing pitch error based on harmonic decomposition
  • On-machine compensation method for large gear hobbing pitch error based on harmonic decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: Changing the rotational speed of the rotary table of the machine tool to compensate for the gear hobbing pitch error, specifically includes the following steps:

[0042] 1) Through the on-machine measurement of the gear with machining allowance, the accumulative deviation data F of the tooth pitch of the gear is obtained pki

[0043] [F pki ] i = 1, 2, 3, ..., z (1)

[0044] That is to say, the accumulative deviation F of the pitch of k teeth pk ;

[0045] 2) The data measured in 1) are harmonically decomposed by discrete Fourier transform, and the amplitude spectrum and phase spectrum are obtained

[0046]

[0047] In the formula, A n is the amplitude of the Nth harmonic, is the phase angle of the Nth harmonic;

[0048] 3) Use the mathematical compensation model of cumulative tooth pitch deviation to solve the error compensation amount (that is, the variable C of the rotational speed of the rotary table of the machine tool p ),Proceed as follows...

Embodiment 2

[0058] Embodiment 2: Changing the speed of the hob to compensate the pitch error of the hobbing process, which specifically includes the following steps:

[0059] 1) Through the on-machine measurement of the gear with machining allowance, the accumulative deviation data F of the tooth pitch of the gear is obtained pki

[0060] [F pki ] i = 1, 2, 3, ..., z (1)

[0061] That is to say, the accumulative deviation F of the pitch of k teeth pk ;

[0062] 2) The data measured in 1) are harmonically decomposed by discrete Fourier transform, and the amplitude spectrum and phase spectrum are obtained

[0063]

[0064] In the formula, A n is the amplitude of the Nth harmonic, is the phase angle of the Nth harmonic;

[0065] 3) Use the mathematical compensation model of cumulative tooth pitch deviation to solve the error compensation amount (that is, the variable C of the hob speed g ),Proceed as follows:

[0066] ① Take out the amplitude A by filtering n Amplitude greater ...

Embodiment 3

[0076] Embodiment 3: Compensating the pitch error of gear hobbing through the periodic axial movement of the hob, specifically including the following steps:

[0077] 1) Through the on-machine measurement of the gear with machining allowance, the accumulative deviation data F of the tooth pitch of the gear is obtained pki

[0078] [F pki ] i = 1, 2, 3, ..., z (1)

[0079] That is to say, the accumulative deviation F of the pitch of k teeth pk ;

[0080] 2) The data measured in 1) are harmonically decomposed by discrete Fourier transform, and the amplitude spectrum and phase spectrum are obtained

[0081]

[0082] In the formula, A n is the amplitude of the Nth harmonic, is the phase angle of the Nth harmonic;

[0083] 3) Using the mathematical compensation model for cumulative tooth pitch deviation, the error compensation amount (that is, the hob axial periodic motion amount C gz ),Proceed as follows:

[0084] ① Take out the amplitude A by filtering n Amplitude g...

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Abstract

The present invention discloses a harmonic decomposition-based on-machine pitch error compensation method for large gear hobbing, and belongs to the technical field of gear mechining error compensation for a numerical control gear hobbing machine. First, an on-machine measurement system of the numerical control gear hobbing machine is used to perform on-machine measurement of a pitch accumulated error to a large gear containing an allowance for machining to obtain pitch accumulated error curve of each tooth; then an amplitude spectrum and a phase spectrum of the pitch accumulated error curve are calculated through discrete Fourier transform; error compensation is calculated through the obtained amplitude spectrum and the phase spectrum; and finally the compensation is input into the numerical control system in the form of a work program or a compensation signal; and the instantaneous transmission ratio between a hobbing cutter and the workpiece is adjusted through engagement relationship between the hobbing cutter and the workpiece so as to realize on-machine compensation of the gear pitch error.

Description

technical field [0001] The invention belongs to the technical field of gear processing error compensation of numerically controlled gear hobbing machines, in particular to an on-machine compensation method for large gear hobbing pitch errors based on harmonic decomposition. Background technique [0002] Large gears are basic components widely used in many fields such as industrial production, military affairs, and detection. With the development of precision manufacturing technology, the requirements for transmission performance of large gears are getting higher and higher, and the quality and accuracy of gear processing determine the performance of gear transmission. . Gear hobbing is a commonly used processing method in gear processing. It has the advantages of high processing efficiency, high tooth profile accuracy, and wide adaptability. It has a wide range of applications in the field of gear processing. The accumulative deviation of gear tooth pitch is an important in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q15/00B23Q15/08B23Q17/20
CPCB23Q15/007B23Q15/08B23Q17/20
Inventor 赫东锋张凯王建华劳奇成张君安杨灿辉
Owner XIAN TECH UNIV
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