Method for eliminating residual thermal stress of hard alloy cutter

A technology of residual thermal stress and cemented carbide, which is applied in the field of eliminating thermal stress of cutting tool materials, can solve the problems of difficult process control, low efficiency, and difficult to be widely promoted, and achieve simple equipment, low overcoming efficiency, and high process controllability efficiency effect

Inactive Publication Date: 2016-08-10
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the high-temperature strength of cemented carbide and prolong its service life, some scholars have eliminated the resid

Method used

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  • Method for eliminating residual thermal stress of hard alloy cutter

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] (1) Use a fine grinder to trim the flatness of the formed and sintered WC-11Co-2.1TaC cemented carbide tool sample with a size of 20mm×5mm×5mm, and then put it into a cold-press mold made of surface-hardened bearing steel .

[0021] (2) Load the cold-press mold equipped with the cemented carbide tool sample into the press for pre-compression, the pressure direction is parallel to the minimum cross-section of the sample, the pressure increase rate is 150MPa / min, the pressure is increased to 500MPa, and the pressure is maintained for 10 seconds; Boost the pressure to 1100MPa, the boost rate is 180MPa / min, continue to boost the pressure to 2000MPa at 200MPa / min, and keep the pressure for 70 seconds; the pressure is reduced in two stages, the first stage is 900MPa, the rate is 100MPa / min, the second stage is 0MPa, the rate 150MPa / min.

[0022] (3) Perform 10 cyclic pressings on the cemented carbide tool sample according to the process parameters in step (2), with an interv...

Embodiment 2

[0025] (1) Use a fine grinder to trim the flatness of the formed and sintered WC-11Co-2.1TaC cemented carbide tool sample with a size of 20mm×5mm×5mm, and then put it into a surface-hardened bearing steel cold-press mold after trimming.

[0026] (2) Load the cold-press mold equipped with the cemented carbide tool sample into the press for pre-compression, the pressure direction is parallel to the minimum cross-section of the sample, the pressure increase rate is 170MPa / min, the pressure is increased to 530MPa, and the pressure is maintained for 10 seconds; Boost the pressure to 1200MPa, the boost rate is 190MPa / min, continue to boost the pressure to 2000MPa at 200MPa / min, keep the pressure for 110 seconds; decompress in two stages, the first stage is 1000MPa, the rate is 100MPa / min, the second stage is 0MPa, the rate 150MPa / min.

[0027] (3) According to the process parameters in step (2), perform 9 cycles of pressing on the cemented carbide tool sample with an interval of 20 ...

Embodiment 3

[0030] (1) Use a fine grinder to trim the flatness of the formed and sintered WC-11Co-2.1TaC cemented carbide tool sample with a size of 20mm×5mm×5mm, and then put it into a surface-hardened bearing steel cold-press mold after trimming.

[0031] (2) Load the cold-press mold equipped with the cemented carbide tool sample into the press for pre-compression, the pressure direction is parallel to the minimum cross-section of the sample, the pressure increase rate is 160MPa / min, the pressure is increased to 440MPa, and the pressure is maintained for 10 seconds; Boost the pressure to 1000MPa, the boost rate is 150MPa / min, continue to boost the pressure to 1800MPa at 200MPa / min, and keep the pressure for 140 seconds; the pressure is reduced in two stages, the first stage is 1000MPa, the rate is 100MPa / min, the second stage is 0MPa, the rate 150MPa / min.

[0032] (3) Carry out 12 cyclic pressings on the cemented carbide tool sample according to the process parameters in step (2), with ...

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Abstract

The invention discloses a method for eliminating residual thermal stress of a hard alloy cutter. A hard alloy cutter sample is subjected to flatness treatment and then mounted in a cold-pressing mold; the cold-pressing mold containing the hard alloy cutter sample is charged into a press to be pre-pressed, after pressure maintaining, two times of pressing pressure increasing are conducted until the pressure reaches the maximum set value, and pressure is unloaded in two steps after pressure maintaining; and the pressure increasing speed and the pressure decreasing speed are controlled, and pressing is repeated for 8-12 times with same pressing parameters. The side face of the pressed hard alloy cutter sample is changed to a stressed face, the pressing load is changed according to the same pressure intensity, operation is repeated with the same pressing parameters, the sample is taken out after pressing is completed, and the low-internal-stress hard alloy cutter is obtained.

Description

technical field [0001] The invention relates to a method for relieving thermal stress in cutting tool materials. Background technique [0002] Cemented carbide is an inorganic non-metal matrix composite material, which combines the advantages of wear resistance and high temperature resistance of carbide ceramic substrates (WC, TiC, etc.) and the toughness of metal binders (Co, Ni, etc.), and is widely used. Used in high-speed cutting tools, molds, impact tools, etc. As a cutting tool material, cemented carbide is required to have good high temperature strength and long life. However, due to the large difference in thermal expansion coefficient between the carbide ceramic matrix and the metal binder, it is easy to generate residual thermal stress during the sintering process. , the thermal stress varies with carbide grain refinement and alloy composition. When subjected to external loads, especially under high-temperature alternating load conditions, the residual thermal st...

Claims

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Application Information

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IPC IPC(8): B22F3/24C22F1/00
CPCB22F3/24C22F1/00
Inventor 董洪峰郭从盛张锋刚
Owner SHAANXI UNIV OF TECH
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