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Method and device for determining critical depth of cut for brittle-to-ductile transition in grinding hard and brittle materials

A critical cutting depth, hard and brittle material technology, applied in grinding automatic control devices, grinding machine parts, grinding/polishing equipment, etc., can solve the problem of low processing efficiency, critical cutting depth cannot be accurately determined, and ductility Grinding and other problems, to achieve the effect of high surface quality, high-precision production and processing

Inactive Publication Date: 2017-01-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the problems of inability to achieve ductility zone grinding and low processing efficiency caused by the inability to accurately determine the critical depth of cut in the existing ultra-precision grinding process

Method used

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  • Method and device for determining critical depth of cut for brittle-to-ductile transition in grinding hard and brittle materials
  • Method and device for determining critical depth of cut for brittle-to-ductile transition in grinding hard and brittle materials
  • Method and device for determining critical depth of cut for brittle-to-ductile transition in grinding hard and brittle materials

Examples

Experimental program
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Effect test

specific Embodiment 1

[0077] Obtained the brittle material brittle-ductile transformation critical depth of cut a of tungsten carbide cemented carbide material on a certain type of ultra-precision grinding machine by the method of the present invention c . The specific implementation process is as follows:

[0078] (1) According to the grinding wheel to be used for tungsten carbide grinding is a W80 resin bonded diamond grinding wheel, the concentration of the grinding wheel is 75%, and the shape of the abrasive grain is determined to be a square pyramid, and the number of abrasive grains is ≥ 3; the concentration of the grinding wheel and Substituting the particle size into formula (2) to calculate the distance between abrasive particles is 66.844 μm, since the size of the particle diameter is between d 0 =70~420μm, so according to the above-mentioned principle of determining the rake angle, the rake angle of abrasive grains is selected as -50°.

[0079] (2) Select and process the abrasive grain...

specific Embodiment 2

[0089] Obtained the brittle material brittle-ductile transformation critical depth of cut a of the brittle material of the glass-ceramic material on a certain type of ultra-precision grinding machine by the method of the present invention c . The specific implementation process is as follows:

[0090] (1) According to the grinding wheel to be used for glass-ceramic grinding is a W20 resin bonded diamond grinding wheel, the concentration of the grinding wheel is 75%, and the shape of the abrasive grain is determined to be a square pyramid, and the number of abrasive grains is ≥ 3; the concentration of the grinding wheel and the particle size Substituting formula (2) to calculate the distance between abrasive grains is 8.355 μm, since the grain size is between d 0 =20~70μm range, so according to the above-mentioned rake angle determination principle, the rake angle of abrasive grains is selected as -45°.

[0091] (2) Select and process the abrasive grain matrix, and fix it on ...

specific Embodiment 3

[0099] The brittle material brittle-ductile transformation critical depth of cut a of the quenched steel material on a certain type of ultra-precision grinding machine is obtained by the method of the present invention c . The specific implementation process is as follows:

[0100] (1) According to the grinding wheel to be used for grinding the quenched steel workpiece is a W120 resin bonded CBN grinding wheel, the concentration of the grinding wheel is 100%, and the shape of the abrasive grain is determined to be a square pyramid, and the number of abrasive grains is ≥ 3; the concentration of the grinding wheel and the particle size Substituting formula (2) to calculate the distance between abrasive grains is 86.832 μm, since the grain size is between d 0 =70~420μm, so according to the above-mentioned principle of determining the rake angle, the rake angle of abrasive grains is selected as -50°.

[0101] (2) Select and process the cubic boron nitride (CBN) abrasive grain su...

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Abstract

The invention relates to the technical field of hard and brittle material ultra-precision machining. In order to achieve ductility domain grinding of the largest cutting depth, high surface quality of the hard and brittle material, and efficient and high-precision production machining, according to the technical scheme, a method and device for determining the grinding brittleness-ductility transformation critical cutting depth of the hard and brittle material comprises the following steps of (1) according to a grinding wheel used in ultra-precision grinding, determining the number, shape and distance of grains of a homemade multi-grain tool, (2) according to the grain shape, distance and front-angle parameters selected in the step (1), machining three or more grains on a grain base body, (3) controlling the multi-grain tool and a workpiece to generate relative motion, beginning to conduct scratching on the surface of the workpiece, meanwhile, controlling the multi-grain tool to conduct continuous feeding, enabling the depth of the scratch to continuously change, and observing and measuring the workpiece after scratching by utilizing a surface contourgraph and a confocal microscopy. The method is mainly applied to ultra-precision machining.

Description

technical field [0001] The invention relates to the technical field of ultra-precision machining of hard and brittle materials, in particular to a method for determining the critical depth of cut for ultra-precision grinding of hard and brittle materials based on a multi-abrasive tool. Background technique [0002] With the development of modern industry, hard and brittle materials (such as infrared optical crystals, engineering ceramics, quartz, silicon crystals, glass ceramics, etc.) Application prospects. However, due to the high hardness, high brittleness and poor processing performance of hard and brittle materials, it is difficult to use ordinary processing methods for ultra-precision processing, thus restricting the popularization and application of these materials. Grinding is a cutting process that uses high-speed rotating grinding wheels and other abrasive tools to process the surface of workpieces. It is often used in finishing and superfinishing stages in machin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B19/00G05B19/18
CPCB24B19/22B24B49/006B24B51/00
Inventor 仇中军杨雪卢翠房丰洲
Owner TIANJIN UNIV
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