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Precision machining method for helical tooth planet row

A precision machining and planetary row technology, applied in the field of gearboxes, can solve the problems of frame position deviation, planetary gear inner hole cylindricity, and planetary gear shaft outer cylindricity, etc., to improve the pass rate and The effect of precision

Pending Publication Date: 2021-12-07
CHONGQING BEIBEN TRANSMISSION MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing processing process, there are problems such as serious out-of-tolerance of the frame position in the helical planetary row, serious out-of-tolerance of the cylindricity of the inner hole of the planetary gear, and serious out-of-tolerance of the outer cylindricity of the planetary gear shaft.

Method used

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  • Precision machining method for helical tooth planet row
  • Precision machining method for helical tooth planet row
  • Precision machining method for helical tooth planet row

Examples

Experimental program
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Effect test

Embodiment 1

[0019] see figure 1 and figure 2 , the material of the planetary frame in this embodiment is ZG270-500GB / T11352-1989, the four planetary shaft hole positions are seriously out of tolerance after being processed by the existing technology, and it is difficult to meet the 0.05 requirement of the drawing. see image 3 and Figure 4 , In this embodiment, the planetary gear and planetary gear shaft material 17Cr2Ni2H-Q / LP117-2000, in order to meet the requirements of hardened layer depth EHT610 0.2-0.5mm and surface hardness ≥ 58HRC, carburizing and quenching are required. The inner hole of the planetary gear is 51mm deep, the diameter is φ30G6mm, and the aspect ratio is 1.7. Similarly, the aspect ratio of the planet wheel shaft is 84 / 22=3.88, which belongs to the slender shaft, and the cylindricity of 0.003 is difficult to achieve.

[0020] This embodiment provides a precision machining method for a helical planetary row, including the following steps:

[0021] 1) Processing...

Embodiment 2

[0028] This embodiment provides a precision machining method for a helical planetary row, including the following steps:

[0029] 1) Processing thin-walled ring gear.

[0030] 2) Process the planetary frame. Among them, the planetary frame is subjected to the grinding process after finishing the shape finishing. The planetary frame is clamped based on the inner hole and the end face, and the shallow hole drilling is selected to set the preset hole as the technological hole when boring. Use a semi-finish boring tool and a fine boring tool to process the planetary shaft hole. By changing the machining datum and selecting appropriate machining tools and cutting parameters, the position of the planetary shaft hole of the frame is improved to ensure that the product design requirements are met.

[0031] 3) Processing planetary gears. Among them, the grinding process of planetary gear teeth is divided into rough grinding and fine grinding. Grinding wheels of different grain siz...

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Abstract

The invention provides a precision machining method for a helical tooth planet row. The machining method comprises the steps of machining a thin-wall gear ring, machining a planet frame, machining a planet gear, machining a planet gear shaft and the like. Rough grinding and accurate grinding of the planet gear and the planet gear shaft are carried out by adopting grinding wheels with different granularities and hardness. The machining method breaks through key technologies such as a high-precision hole machining reference and cutter selection technology and application of the grinding wheels with different granularities and hardness in accurate grinding, gear ring machining deformation is controlled through measures such as process optimization, special tool use and process parameter adjustment, the part manufacturing qualification rate and precision are improved, and the consistency and the reliability of the quality of a spaceflight product gearbox and an AT gearbox are further ensured.

Description

technical field [0001] The invention relates to the technical field of gearboxes, in particular to a method for processing helical planetary rows. Background technique [0002] The chassis gearbox and AT gearbox of aerospace products have important military significance. The helical gear planetary row is the core component of the gearbox product, which plays the role of transmitting speed and torque and realizing the shifting of the gearbox. [0003] Due to the characteristics of heavy load, high precision and high reliability, the chassis gearbox and AT gearbox of aerospace products have extremely high requirements on the precision of the helical planetary arrangement. However, in the existing processing process, there are problems such as serious out-of-tolerance of the frame position in the helical planetary row, serious out-of-tolerance of the cylindricity of the inner hole of the planetary gear, and serious out-of-tolerance of the outer cylindricity of the planetary ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/04
CPCB23P23/04
Inventor 周友国王虎陈绍龙李云飞黄进刘宇刘燕
Owner CHONGQING BEIBEN TRANSMISSION MFG
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