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Method for processing steel member bush step holes with guaranteed coaxiality

A processing method and step hole technology, which is applied in the field of high-precision parts processing, can solve the problems of low qualification rate of key parts and inability to guarantee task delivery, and achieve the effect of saving processing costs and ensuring product quality.

Inactive Publication Date: 2017-06-23
GUIZHOU HONGLIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a processing method for the coaxiality of the step hole of the steel bushing, so as to solve the technical problem that the pass rate of key parts is low and the task delivery cannot be guaranteed during the development of new products, so as to overcome the deficiencies of the prior art

Method used

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  • Method for processing steel member bush step holes with guaranteed coaxiality
  • Method for processing steel member bush step holes with guaranteed coaxiality
  • Method for processing steel member bush step holes with guaranteed coaxiality

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Quenching parts such as figure 1 As shown, the material is 9Cr18. Heat treatment requirements: hardness ≥ 56HRC. The part is a thin-walled part, which is easily deformed during processing. The qualified rate of parts adopting the processing method of the present invention is above 98%.

Embodiment 2

[0068] Carburized parts such as figure 2 As shown, material: 12CrNi3A, heat treatment requirements: carburizing depth 0.6 ~ 0.8mm (design drawing requirements 0.4 ~ 0.7mm), hardness ≥ 56HRC. The difficulty in processing this part is that the φ4 hole is very small, and the coaxiality is difficult to process and difficult to guarantee. By adopting the processing method of the invention, the cylindricity of the large hole of the part and the run-out value of the large hole to the small hole can meet the technical requirements, and the processing quality is stable. Since the position of the φ4 small hole is relatively deep, the length of the grinding wheel rod is relatively large. Therefore, the toughness of the grinding wheel rod is poor, resulting in poor cylindricity and surface roughness of the φ4 hole, and a certain machining allowance is required (usually 0.02~ 0.03mm) Grinding hole correction in 100 processes. The passing rate is 96%.

Embodiment 3

[0070] Nitriding parts such as image 3 As shown, material: 4Cr14Ni14W2Mo, heat treatment requirements: nitriding depth ≥ 0.1mm (the design requires nitriding depth not less than 0.07mm), hardness ≥ 700HV. The difficulty in processing this type of parts is that the margin of the inner hole of the part after nitriding is very small (the margin on one side is 0.03-0.05mm). scrapped. Therefore, it is critical to control the nitriding deformation of parts. After the hot and cold coordination with the heat meter branch factory, the machining branch factory guarantees the coaxiality φ0.01 before heat treatment, and the heat meter branch factory guarantees the coaxiality φ0.03 after heat treatment. After heat treatment, the coaxiality of the parts is corrected to φ0.005max by CNC internal grinding. The coaxiality of the two holes after grinding can meet the requirements of the design drawing.

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Abstract

The invention discloses a method for processing steel member bush step holes with guaranteed coaxiality. The method adopts S145 high precision numerical control internal grinder and the strong programming function of the S145 high precision numerical control internal grinder to realize processing of two step holes of a steel member bush by one time clamping. During clamping, an excircle of a member is used as a positioning clamping reference surface of the processing and soft claw clamp is selected and used; the soft claw is polished so that the jitter of the soft claw is not greater than the precision requirement of the member; a suitable grinding wheel is selected according to the size, roughness, cylindricity and coaxiality of the member; a diamond pen is adopted to flat the excircle surface of the grinding wheel; a processing program is compiled; the processing program is input in the S145 high precision numerical control internal grinder; a zero-point position of a three-dimensional coordinate for processing the member is registered in the S145 high precision numerical control internal grinder; the grinding wheel is adjusted to the zero point position and the S145 high precision numerical control internal grinder is started to automatically complete processing according to the program. By means of the method, the qualified rate of processed members is increased from 10-60% to 90% and above.

Description

technical field [0001] The invention relates to a processing method for the coaxiality of a stepped hole of a bushing of a steel part, belonging to the technical field of high-precision parts processing. Background technique [0002] In a new product, there is a steel bushing part, the inner hole of which is a stepped hole with two different diameters, and the part requires very high coaxiality between the large hole and the small hole. For parts with high coaxiality requirements, there are currently two traditional processing methods: one is to use CNC lathes or ordinary lathes to process large holes and small holes in one clamping method; the other is to use coaxiality The grinder is a method for correcting the coaxiality or runout of two holes. The above two methods are very unstable for processing high-hardness steel materials, and the qualified rate of one-time processing can only reach 10-60%. The runout correction often fails to meet the requirements during processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B1/00B24B5/06B24B5/35B24B41/06B24B51/00
CPCB24B1/00B24B5/06B24B5/35B24B41/06B24B51/00
Inventor 梁伟强刘杨张杰陈云维
Owner GUIZHOU HONGLIN MACHINERY
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