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Hard-tooth-surface gear machining process

A processing technology, hard tooth surface technology, applied in the field of hard tooth surface gear processing technology, can solve the problems of affecting the production efficiency of gears, low grinding efficiency, difficult to control the precision, etc., to improve the cylindricity accuracy of the inner hole and the tool life, Improve production efficiency and production benefits, and reduce the effect of cutting back

Active Publication Date: 2021-01-29
河南蒲瑞精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reason why at the end of gear machining, the center hole of the gear is processed by fine grinding instead of fine turning. The main reason is that the surface hardness of the gear is relatively high after carburizing, and the keyway has been opened, so the center hole of the gear is no longer If a complete round surface is machined by turning, intermittent turning will occur, which makes it difficult to control the precision, severe tool wear, and increased scrap rate, especially for hardened gears with a hardness of 45HRC-62HRC. In the prior art, fine grinding is used for final processing; however, the disadvantage of grinding compared to turning is that the grinding efficiency is too low, especially for mass-produced parts such as gears, the low efficiency means The production capacity will be reduced a lot, which will greatly affect the production efficiency of the gear

Method used

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  • Hard-tooth-surface gear machining process

Examples

Experimental program
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Effect test

Embodiment 1

[0023] combined with Figure 1-7 The hard-toothed gear processing technology includes the following steps:

[0024] S1, blanking, making blank;

[0025] S2, rough turning, rough turning on the surface of the blank;

[0026] S3, quenching and tempering, performing quenching and tempering treatment on the blank;

[0027] S4, semi-finishing, semi-finishing the end face and outer wall of the blank;

[0028] S5. Process the inner hole, drill the inner hole at the center of the blank, determine the aperture r1 with a deformation allowance according to the deformation interval of the inner hole diameter before and after carburizing, and turn the inner hole diameter to r1;

[0029] In fact, it is clear to those skilled in the art that in actual operation, it is difficult to accurately control the interval value ∆r of the pore diameter change of the gear inner hole before and after carburizing, because it depends on the pore size, pore length, heat treatment temperature, time etc. ...

Embodiment 2

[0036] Compared with Example 1, in step S6, the distance value between the intersection point o and the end point a is based on the deformation interval before and after carburizing of the inner hole diameter, and the maximum deformation value ∆r is taken; the position of the end point a cannot be along the design The groove wall is randomly selected towards the inside of the keyway, that is, the structure of the keyway should not be too far behind, and the deformation error before and after carburizing should also be considered, so it should not be too far forward.

Embodiment 3

[0038] Compared with Example 1, in step S6, the chamfer is tangent to the circle where the aperture r1 is located at the tangent point b; that is, the chamfer is more gentle and excessive, and the buffering effect is maximized to reduce the gap of the intermittent turning notch. Back to eat the amount of knife.

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Abstract

The invention relates to the technical field of gear manufacturing, in particular to a hard-tooth-surface gear machining process. The process comprises the following steps of S1, blanking; S2, rough turning; S3, hardening and tempering; S4, semi-finish turning; S5, inner hole machining, wherein an inner hole is drilled in the center of a blank, and turning is performed to make the hole diameter ofthe inner hole reach r1; S6, keyway machining and keyway chamfering, wherein a broach with chamfers is used for performing broaching to form a keyway and two symmetrical chamfers at a notch of the keyway, and the endpoint a, close to one end of the keyway, of each chamfer needs to meet the requirement that with the intersection point o of a circle with the designed hole diameter of the inner holeas r and the corresponding keyway wall of the designed keyway as a datum point, the endpoint a is selected from the corresponding designed keyway wall to the interior of the keyway; S7, hobbing; S8,carburizing; and S9, finish machining, wherein finish machining is performed on the workpiece surface, accurate grinding treatment is conducted on outer teeth, and a turning tool is used for performing finish turning on the inner hole to reach the designed hole diameter r. According to the gear machining process, turning finish machining of the gear inner hole is achieved, the production efficiency is improved, and meanwhile, the problem of tool abrasion caused by intermittent turning is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of gear manufacturing, in particular to a gear processing technology with hard tooth surface. Background technique [0002] As we all know, the processing and production of gears is essentially the processing of the outer dimensions of the gears to meet the requirements of the transmission, and the heat treatment of the gears to meet the performance requirements, and the focus of processing the outer dimensions of the gears is mainly the gear. Tooth shape, inner hole and keyway are processed; so far, the processing technology of gears has been relatively mature. For example, the Chinese invention patent with the notification number CN110102990A discloses a gear processing technology, including S1, blank purchase, S2, blank Normalizing, S3, machining, S4, grinding center hole, S5, keyway opening, S6, gear hobbing, S7, carburizing and hanging polishing, S8, rough grinding, S9, gear skiving, S10, fine grinding ...

Claims

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Application Information

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IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 李计全吴超凡郭仕博倪文强
Owner 河南蒲瑞精密机械有限公司
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