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A processing method for continuous generation and hobbing of non-circular gears

A technology of non-circular gears and processing methods, applied to components with teeth, belts/chains/gears, gear teeth, etc., can solve problems such as redundant codes, processing principle errors, etc., to avoid acceleration and deceleration control, and shorten the manufacturing cycle , High-efficiency and high-precision hobbing processing effect of non-circular gears

Active Publication Date: 2017-12-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method firstly has machining principle errors, and secondly, the code is lengthy. During the machining process, each axis of the machine tool is accompanied by frequent acceleration and deceleration, which limits the improvement of the feed speed of each axis of the machine tool.
[0003] A method for hobbing helical non-circular gears refers to the movement form of each axis of the machine tool during the processing of helical non-circular gears, but does not involve the specific movement mathematical relationship of each numerical control axis of the machine tool during the processing of non-circular gears , and the realization technology of the servo motion of each CNC axis of the machine tool with a certain mathematical correlation

Method used

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  • A processing method for continuous generation and hobbing of non-circular gears
  • A processing method for continuous generation and hobbing of non-circular gears
  • A processing method for continuous generation and hobbing of non-circular gears

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] see Figure 5 , for adopting the inventive method, hobbing the cutter position locus sectional view of external meshing oval spur gear, the pitch curve equation of external meshing oval spur gear is,

[0073]

[0074] The workpiece to be processed is an external meshing oval spur gear, and the gear parameters related to processing: semi-major axis A=44.143mm, order n=2, tooth width b=30mm, eccentricity k=0.2, normal modulus m n =3mm, number of gear teeth Z=30, polar angle The determination of the processing parameters can be selected with reference to the processing of cylindrical gears. Here, it is taken as: the number of hob heads K=1, the hob speed is 200rpm, the radial speed is 1mm / min, the axial feed speed is 2mm / min, and the hobbing method is reverse roll.

[0075] Based on the above parameters, the CNC machining code of the oval spur gear can be written, and the CNC system compiles and executes the machining code to control the timely opening and closing of...

Embodiment 2

[0082] see Figure 6 , for adopting the method of the present invention, hobbing the cutter position track sectional view of external meshing oval helical gear, the pitch curve equation of external meshing oval helical gear is the same as formula (8), and the gear parameters relevant to processing: semi-major axis A =45.70mm, order n=2, tooth width b=30mm, eccentricity k=0.2, normal modulus m n =3mm, helix angle β c =15°, number of gear teeth Z=30, polar angle The determination of the processing parameters can be selected with reference to the processing of cylindrical gears. Here, it is taken as: the number of hob heads K=1, the hob speed is 200rpm, the radial speed is 1mm / min, the axial feed speed is 2mm / min, and the hobbing method is reverse roll.

[0083] Based on the above parameters, the CNC machining code of the oval helical gear can be written, and the CNC system compiles and executes the machining code to control the timely opening and closing of the flexible elec...

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Abstract

The invention relates to a machining method for continuous generating gear hobbing of a non-circular gear. The method is based on a numerically-controlled gear hobbing machine comprising a workbench, a gear blank rotating shaft, a hob rotating shaft, a hob front-and-back movement shaft, a hob up-and-down movement shaft and a flexible electronic gearbox; a non-circular gear blank is fixed on the workbench, and the workbench is driven by the gear blank rotating shaft to move at the variable speed; when the rotating speed of the hob rotating shaft is constant, the real-time speed of the hob front-and-back movement shaft and the real-time speed of the gear blank rotating shaft are calculated in real time through the flexible electronic gearbox and are subjected to closed-loop control, and hobbing of the non-circular gear blank is realized; and in the hobbing process, the speed ratio coefficient among the gear blank rotating shaft, the hob front-and-back movement shaft and the hob rotating shaft is monitored and calculated in real time, and the speed of the gear blank rotating shaft and the speed of the hob front-and-back movement shaft are controlled, so that continuous generating gear hobbing machining of the pitch curve of the non-circular gear is realized. According to the method, all that is required for machining is to import the polar equation of the pitch curve of the non-circular gear into a numerical control system, and the manufacturing period of the non-circular gear is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of gear manufacturing, in particular to the technical field of manufacturing non-circular gears capable of realizing gear ratio transmission, and relates to a method for continuously generating hobbing of non-circular gears. Background technique [0002] For a long time, the hobbing of non-circular gears has been based on the processing idea that the hob projects the center line of the rack on the end face of the gear blank and the pitch curve of the non-circular gear is gradually generated, that is, a series of discrete points can be obtained on the pitch curve of the non-circular gear , and respectively calculate the displacements of the gear blank rotary axis, the hob rotary axis and the hob moving axis when the tangent point between the projected rack centerline and the non-circular gear pitch curve changes from one discrete point to the next discrete point, and then let The gear hobbing machine moves gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23F1/00
CPCB23F1/00
Inventor 韩江夏链李大柱高婷田晓青
Owner HEFEI UNIV OF TECH
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