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High-strength and high-speed cutter

A high-speed cutting and high-strength technology, applied in the field of ceramics, can solve the problems of poor sinterability, incomparable performance, and poor performance, and achieve the effects of improving thermal shock resistance and high temperature brittleness, bending strength and fracture toughness

Inactive Publication Date: 2015-07-29
东莞市精发精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiC-based cermets, TiN-based cermets and Ti(C,N)-based cermets have low toughness and are difficult to compare with traditional WC-based cemented carbides.
while for Cr 3 B 2 base cermet, due to Cr 3 B 2 The low self-diffusion coefficient makes its sinterability poor, and it is easy to react with the binder metal to form a brittle third phase during the sintering process. Therefore, Cr 3 B 2 Base cermets are difficult to prepare dense materials by traditional powder metallurgy methods, and their performance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A high-speed cutting tool, the high-speed cutting tool is made of cermet, the cermet includes a hard phase and a binder phase, and the chemical composition is calculated by weight percentage: TiC: 6.8%, ZrC: 1.6%, Cr 3 B 2 : 9.1%, Mo: 7.2%, C: 1.1%, Ni: 21.2%, and the balance is (Ti x , W y ) C and unavoidable impurities, where x: 0.32, x+y=1;

[0024] Among them TiC, ZrC, Cr 3 B 2 and (Ti x , W y ) C is a hard phase, the average particle size of TiC phase in the longitudinal section at 1mm below the tool surface is 0.08~0.12μm, Cr 3 B 2 The average particle size of the phase is 0.62 μm, (Ti x , W y ) The average particle size of the C phase is 0.12 μm, (Ti, W, Mo) C solid solution surrounds the hard phase, and the average particle size of the TiC phase in the longitudinal section of a sphere with a diameter of 0.5 mm at the center of the tool Diameter 0.,31μm, Cr 3 B 2 The average particle size of the phase is 0.62 μm, (Ti x , W y ) The average particle s...

Embodiment 2

[0026] The preparation method of embodiment 1 high-speed cutting tool, comprises the steps:

[0027] (1) Dry grinding: TiO 2 Powder and W powder are mixed, and dry ball milling is carried out with a ball mill, the ball-to-material ratio is 56:1, the ball milling time is 49 hours, and the ball material is stainless steel;

[0028] (2) Wet grinding: the mixture obtained by dry grinding and (Ti x , W y ) C powder, Cr 3 B 2 Powder, ZrC particles, TiC particles, Mo powder, C powder, and Ni powder are mixed evenly, and then ball milled with a wet mill and a wet grinding agent. The ball-to-material ratio is 6:1, the speed is 198rpm, and the wet milling time is 32 hours;

[0029] (3) drying, drying the slurry after wet grinding in step (2), and passing the dried powder through a 110-mesh sieve;

[0030] (4) Molding: Mix the mixed powder obtained in step (3) with a molding agent in a molding machine, and mold it with a pressure of 302 MPa to obtain a molded high-speed cutting tool...

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PUM

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Abstract

The invention discloses a high-strength and high-speed cutter which is made of metal ceramic and comprises the following chemical components in percentage by weight: 2.5 to 12.8 percent of TiC, 8.8 to 10.6 percent of Cr3B2, 6 to 8 percent of Mo, 0.6 to 1.8 percent of C, 18 to 26 percent of Ni and the balance of (Tix, Wy)C; in a longitudinal section of a part of 1mm below the cutter surface, the average particle size of a TiC phase is 0.08 to 0.12 microns, the average particle size of a Cr3B2 phase is 0.28 to 1.0 microns, and the average particle size of a (Tix, Wy)C phase is 0.11 to 0.18 microns; a (Ti, W, Mo)C sosoloid encircles a hard phase. The high-speed cutter has the properties of high hardness, high bending strength, high fracture toughness and the like.

Description

technical field [0001] The invention belongs to the field of ceramics, in particular to a high-speed cutting tool. Background technique [0002] Cutting tools have strict requirements on their materials due to their high hardness, high temperature resistance and high temperature brittleness prevention. Cermets are increasingly becoming the main material of high-speed cutting tools. Cermets include hard phases and binder phases. Hard phases, due to the high strength, hardness, wear resistance and thermal stability of transition metal carbides, nitrides, and borides, are widely used as hard phases of cermets, and the most studied ones are WC, TiC, TiN, Ti(C,N), Cr 3 B 2 Such compounds as the hard phase, cermets with Co, Ni, Fe and other metals or alloys as the binder phase. TiC-based cermets, TiN-based cermets and Ti(C,N)-based cermets have low toughness and are difficult to compare with traditional WC-based cemented carbides. while for Cr 3 B 2 base cermet, due to Cr 3...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C32/00C22C30/00C22C1/05
CPCC22C1/051C22C29/02C22C30/00C22C32/0047
Inventor 李白
Owner 东莞市精发精密机械有限公司