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Polycrystalline cubic boron nitride cutting tool material for finishing iron castings and preparation method thereof

A technology of polycrystalline cubic and boron nitride cutters, applied in metal processing equipment, transportation and packaging, etc., can solve problems such as poor surface finish of workpieces, difficulties in mixing and sintering, and achieve good impact resistance, fine particle size, The effect of high thermal conductivity

Inactive Publication Date: 2017-12-08
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the same content of CBN, the coarser the particle size of CBN powder, the stronger the ability of polycrystalline cubic boron nitride tool to resist mechanical wear, but the surface finish of the workpiece is not good, so it is suitable for rough machining of the workpiece; the finer the particle size of CBN powder, the stronger the polycrystalline cubic boron nitride The better the wear resistance of the boron nitride tool, the higher the compressive strength, the better the surface finish of the workpiece, which is suitable for the finishing of the workpiece, but the finer the particle size, the more difficult it is to mix and sinter

Method used

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  • Polycrystalline cubic boron nitride cutting tool material for finishing iron castings and preparation method thereof
  • Polycrystalline cubic boron nitride cutting tool material for finishing iron castings and preparation method thereof
  • Polycrystalline cubic boron nitride cutting tool material for finishing iron castings and preparation method thereof

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Effect test

Embodiment 1

[0021] A polycrystalline cubic boron nitride cutting tool material for finishing iron castings and a preparation method thereof, comprising the following steps:

[0022] (1) Put cubic boron nitride powder and metal powder into a vacuum furnace for physical vacuum treatment to remove moisture, oxygen and other impurities;

[0023] (2) Mix the cubic boron nitride micropowder treated in step (1) according to the need to take micropowders of different particle sizes according to weight parts to make cubic boron nitride mixture, and mix the metal powder treated in step (1) according to It is necessary to mix different types by weight to make metal powder mixture, and then mix cubic boron nitride mixture and metal powder mixture by weight to make polycrystalline cubic boron nitride tool material, cubic boron nitride See Table 1 for the specific components and proportions of metal powder and metal powder.

[0024] Table 1 Component distribution ratio of PCBN tool materials

[0025]...

Embodiment 2

[0031] The polycrystalline cubic boron nitride cutting tool material and preparation method of the iron casting finishing machining of the present embodiment are as follows:

[0032] (1) Put cubic boron nitride powder and metal powder into a vacuum furnace for physical vacuum treatment to remove water, oxygen and other impurities;

[0033] (2) Mix the cubic boron nitride micropowder treated in step (1) according to the need to take micropowders of different particle sizes according to weight parts to make cubic boron nitride mixture, and mix the metal powder treated in step (1) according to It is necessary to mix different types by weight to make metal powder mixture, and then mix cubic boron nitride mixture and metal powder mixture by weight to make polycrystalline cubic boron nitride tool material, cubic boron nitride See Table 2 for specific components and ratios of metal powder and metal powder;

[0034] Table 2 Component distribution ratio of PCBN tool materials

[0035...

Embodiment 3

[0042] The polycrystalline cubic boron nitride cutting tool material and preparation method of the iron casting finishing machining of the present embodiment are as follows:

[0043] (1) Put cubic boron nitride powder and metal powder into a vacuum furnace for physical vacuum treatment to remove moisture, oxygen and other impurities;

[0044] (2) Mix the cubic boron nitride micropowders treated in step (1) according to the needs with cubic boron nitride micropowders of different particle sizes according to weight parts to make cubic boron nitride mixture, and process the cubic boron nitride powders in step (1) According to the needs, different types of metal powder are mixed by weight to make metal powder mixture, and then the cubic boron nitride mixture and metal powder mixture are mixed by weight to make the raw material of polycrystalline cubic boron nitride tool material; See Table 3 for specific components and proportions of cubic boron nitride and metal powder;

[0045]...

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Abstract

The invention provides a polycrystalline cubic boron nitride cutting tool material for finishing iron castings. The cutting tool material is made of the following materials in parts by weight: 85-99 parts of cubic boron nitride micropowder, 1-15 parts of metal powder, The cubic boron nitride micropowder is composed of at least two kinds of micropowders with particle sizes of 1-2µm, 0.5-1µm and 0-0.5µm. The present invention adopts nano-scale CBN micropowder mainly of 0‑0.5µm as the main raw material, supplemented with fine-grained cubic boron nitride micropowder and metal powder with a maximum particle size not greater than 2µm, and polycrystalline cubic boron nitride powder prepared by ultra-high pressure and high temperature. Due to its high content of cubic boron nitride and fine particle size, boron tool material has the advantages of high thermal conductivity, good impact resistance, high wear resistance, and good surface finish of parts. Most of the cutting heat is transferred to chips through the tool and Carried away by chips, it is very suitable for precision machining of cast iron parts.

Description

technical field [0001] The invention relates to the technical field of preparation of polycrystalline cubic boron nitride cutting tool materials for finishing iron castings, in particular to an ultrafine-grained polycrystalline cubic boron nitride cutting tool material and a preparation method thereof. Background technique [0002] Cubic boron nitride is a superhard material second only to diamond in hardness. Its crystal structure is similar to that of diamond, and it belongs to a stable cubic structure. It has good chemical stability, strong oxidation resistance, and good red hardness. It can maintain high mechanical properties and hardness, and does not react with iron group elements even at a high temperature of 1300 degrees Celsius, which is very suitable for processing ferrous metal materials. Polycrystalline cubic boron nitride is a composite material made of cubic boron nitride single crystal micropowder mixed with a binder and then sintered under high temperature an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/16C22C1/05B22F3/14B22F1/00
CPCC22C1/051C22C26/00B22F3/14B22F2998/10C22C2026/003B22F1/052B22F1/0003B22F1/14B22F3/02
Inventor 聂建军李辉陈厚民鄢鸿桢姜春英吴笑伟
Owner ZHONGYUAN ENGINEERING COLLEGE
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