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Method for increasing gear hob processing accuracy

A technology of machining accuracy and gear hobbing, applied in the fields of genetic laws, instruments, electrical and digital data processing, etc., it can solve problems such as inability to comprehensively model multiple indicators, inability to predict tooth surface profile errors, machine tool damage, etc., and achieve fast solution speed. , The effect of optimizing the effect to improve and reduce the modeling cost

Inactive Publication Date: 2017-12-15
HEFEI UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to obtain a more accurate prediction model of the tooth surface profile error and reduce the cost brought by a large number of tests, some scholars have arranged the process parameters based on the central composite test design. However, the process parameters set by the central composite test design The parameters will exceed the scope of the layout, which will easily cause damage to the machine tool. Some scholars analyze and model the independent index multi-factor problem based on the response surface method, because the response surface test design is limited to finding the relationship between the independent test index and each factor. Therefore, it is impossible to predict the profile error of the tooth surface and select the best combination of gear cutting process parameters.

Method used

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  • Method for increasing gear hob processing accuracy
  • Method for increasing gear hob processing accuracy

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Taking the 40Cr processed gear as an example, YGS3110B CNC gear hobbing machine is used. The basic parameters of the gear are: modulus m n=2, number of teeth z=6, gear helix angle β=30°, pressure angle α=20°. The basic parameters of the hob are: modulus m n =2, number of heads z=1, hob helix angle β=4.25°, pressure angle α=20°. Use the JD45 gear measuring center to detect the tooth profile errors.

[0041] see figure 1 , an operation step to improve hobbing precision is as follows:

[0042] Step (1), according to the hobbing process of the processed gear, extract the hobbing process parameters that affect the gear machining accuracy, design the combination of hobbing process parameters, conduct hobbing processing experiments, and obtain the tooth surface profile error index of the processed gear.

[0043] The present invention is mainly aimed at gear hobbing processing, and the three gear hobbing process factors are hob speed S S , rolling cutting depth h d , Axi...

Embodiment 2

[0073] 1. Workpiece parameters

[0074] Concrete flow process of the present invention is as figure 1 shown. Taking the 40Cr processed gear as an example, YGS3110B CNC gear hobbing machine is used. The basic parameters of the gear are: modulus m n =1.25, number of teeth z=43, gear helix angle β=24°, pressure angle α=20°. The basic parameters of the hob are: modulus m n =1.25, number of heads z=1, hob helix angle β=2.33°, pressure angle α=20°. The feeding method is axial and radial continuous feeding. Use the JD45 gear measuring center to detect the tooth profile errors.

[0075] 2. Process parameters

[0076] The ranges of the four hobbing process factors are:

[0077] Hob speed 800S d z <15.

[0078] 3. The operation steps for improving the hobbing precision are the same as in Embodiment 1.

[0079] 4. Results.

[0080] The optimal combination of gear hobbing process parameters obtained by this method is: hob speed S S =1420(r / min); hobbing depth h d =0.75(mm); A...

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Abstract

The invention relates to the method for increasing gear hob processing accuracy. Operation steps comprise the steps that (1) aiming at gear hob technologies of a processed gear, gear hob technological parameters which affect gear processing accuracy are extracted, a gear hob technological parameter combination is designed, gear hob processing experiments are conducted, and a gear face outline error indexes of the processed gear are obtained; (2) a gear face outline error digital model is established through a response curve face nonlinear fitting method according to the gear hob technological parameter combination and the gear face outline error indexes of the processed gear; (3) based on an expected processing accuracy value corresponding to each gear face outline error index, a weight ratio is applied to each gear face outline error model, and a digital model of gear face comprehensive outline errors is established; and (4) based on a genetic algorithm, the gear hob technological parameters are optimized and optimal gear hob technological parameters are obtained. According to the invention, the processing accuracy of a gear hob is increased; and a theoretical base for selection of actual gear hob technological parameters and increase of gear accuracy.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing technology, and in particular relates to a method for improving the precision of gear hobbing. Background technique [0002] In the actual hobbing process, the motion between the hob and the workpiece gear can evolve into a transmission between a pair of cross-axis helical gears. Due to the different interpolation periods of the system, the rigidity of the machine tool motor, vibration of the machine tool, thermal deformation and other factors, the workpiece gear is not a smooth involute surface, and certain ripples will be formed. Contour errors have a decisive influence. Theoretical corrugation height and direction of the tooth surface can be derived and calculated according to various accuracy indicators of the machine tool, interpolation cycle of the CNC system, installation accuracy of the fixture, various geometric accuracy indicators of the tool, and meshing principles. Beca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12B23F5/20
CPCB23F5/20G06F30/17G06N3/126
Inventor 韩江夏链袁彬朱永刚吴路路
Owner HEFEI UNIV OF TECH
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