Spark plasma sintering manufacturing technology for high-rigidity polycrystalline diamond drawing die

A technology of polycrystalline diamond and discharge plasma, which is applied in the field of wire drawing dies, can solve problems such as shortening the sintering time, and achieve the effects of shortening the sintering time, promoting diffusion, and speeding up the sintering speed

Inactive Publication Date: 2015-05-06
天长市天屹模具科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the initial stage of sintering, the DC pulse voltage is used to generate high-temperature plasma between the particles, and the surface of the sintered material is cleaned, activated and uniformly heated, which helps to form a homogeneous and high-performance sintered body. The sintered material in the mold is heated by electricity, which has high thermal efficiency and can obtain extremely fast heating speed, thereby effectively shortening the sintering time, and at the same time, it is also conducive to maintaining the microstructure of the raw material and obtaining a sintered material with excellent performance. Underused in the die-inserting process

Method used

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  • Spark plasma sintering manufacturing technology for high-rigidity polycrystalline diamond drawing die
  • Spark plasma sintering manufacturing technology for high-rigidity polycrystalline diamond drawing die
  • Spark plasma sintering manufacturing technology for high-rigidity polycrystalline diamond drawing die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] S1. Mix the metal powders evenly according to the mass proportion listed in Example 1 in Table 1;

[0031] S2, place the steel sleeve in the lower cavity of the upper die 1, and then place the cylinder of the lower die 2 in the lower cavity of the upper die 1, so that the steel sleeve is installed between the upper die 1 and the lower die 2; weigh A The metal powder prepared in unit S1 is poured into the steel sleeve, the graphite mold is vibrated to make the metal powder even and smooth, and the graphite pressure column is inserted into the upper mold 1 from the upper cavity, as shown in image 3 As shown, the graphite pressing column presses the metal powder, and the combination of the upper mold 1, the lower mold 2, the steel sleeve, the metal powder and the graphite pressing column is put into the sintering machine, and the metal powder is compacted by cold pressing, and the compacted metal powder Form the bottom of the insert; stick the polycrystalline diamond mold...

Embodiment 2

[0036] S1, mix each metal powder evenly according to the mass proportion listed in Example 2 in Table 1;

[0037] S2, the steel sleeve is placed in the lower cavity of the upper mold 1, and then the cylinder of the lower mold 2 is placed in the lower cavity of the upper mold 1, so that the steel sleeve is installed between the upper mold 1 and the lower mold 2; The metal powder prepared in unit A S1 is poured into the steel sleeve, the graphite mold is vibrated to make the metal powder even and smooth, and the graphite pressure column is inserted into the upper mold 1 from the upper cavity, as shown image 3 As shown, the graphite pressing column presses the metal powder, and the combination of the upper mold 1, the lower mold 2, the steel sleeve, the metal powder and the graphite pressing column is put into the sintering machine, and the metal powder is compacted by cold pressing, and the compacted metal powder Form the bottom of the insert; stick the polycrystalline diamond ...

Embodiment 3

[0042] S1, mix each metal powder evenly according to the mass proportion listed in Example 3 in Table 1;

[0043] S2, the steel sleeve is placed in the lower cavity of the upper mold 1, and then the cylinder of the lower mold 2 is placed in the lower cavity of the upper mold 1, so that the steel sleeve is installed between the upper mold 1 and the lower mold 2; The metal powder prepared in unit A S1 is poured into the steel sleeve, the graphite mold is vibrated to make the metal powder even and smooth, and the graphite pressure column is inserted into the upper mold 1 from the upper cavity, as shown image 3 As shown, the graphite pressing column presses the metal powder, and the combination of the upper mold 1, the lower mold 2, the steel sleeve, the metal powder and the graphite pressing column is put into the sintering machine, and the metal powder is compacted by cold pressing, and the compacted metal powder Form the bottom of the insert; stick the polycrystalline diamond ...

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PUM

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Abstract

The invention discloses a spark plasma sintering manufacturing technology for a high-rigidity polycrystalline diamond drawing die. A bushing is obtained by carrying out spark plasma sintering on metal powder, the vacuum degree is 2-8 Pa, the initial pressure is 20-30 MPa, after the temperature is increased to 300-350 DEG C with the rate of 80-100 DEG C/min, the pressure is reduced to 10-20 MPa, after the temperature is increased to 420-450 DEG C with the rate of 50-80 DEG C/min, the pressure is reduced to 8-10 MPa, after the temperature is increased to 500-520 DEG C with the rate of 30-50 DEG C/min, the temperature is increased to 550-570 DEG C with the rate of 20 DEG C/min, the temperature and the pressure are kept for 30-50 seconds, and the drawing die is obtained through cooling. In the spark plasma sintering process, shock waves, electrons and ions generated by pulse discharge can purify and activate powder, particles can be subjected to the comprehensive action of ion discharge, electric conduction heating and pressurizing at the same time, the activation energy is reduced, the sintering time is shortened, and the growth of grains is restrained; the nucleation energy can be reduced through pulse current, the nucleation rate is increased, and fine tissue is obtained. According to the spark plasma sintering manufacturing technology, a novel metal powder formula for the bushing and the spark plasma sintering technology are adopted, and therefore the high-strength, high-rigidity and high-density die is obtained.

Description

technical field [0001] The invention relates to the technical field of wire drawing dies, in particular to a spark plasma sintering manufacturing process of a high-hardness polycrystalline diamond wire drawing die. Background technique [0002] In metal pressure processing, the metal is forced to pass through the mold under the action of external force, the metal cross-sectional area is compressed, and the tool that obtains the required cross-sectional area, shape and size is called a wire drawing die, which is a kind of wire drawing die. From thick to thin, the tool gradually reaches the size required by people. It is composed of two parts: the mold sleeve and the mold core. During use, the mold will be damaged to varying degrees due to the effect of drawing. Good quality molds It is very important to improve the production efficiency of the enterprise and reduce the cost of the enterprise. In order to reduce the cost, obtain stable and long-term drawing, accurate size, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/14C22C30/06
Inventor 朱家德王子尊许会子房如勤
Owner 天长市天屹模具科技发展有限公司
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