Vacuum secondary hot pressing manufacturing technology for high-strength polycrystalline diamond drawing die

A polycrystalline diamond, secondary hot pressing technology, applied in the field of wire drawing dies, can solve the problems of service life and die repair not satisfying people, and achieve the effects of less cracks, increased density, and optimized process

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

The molds in the prior art can not reach the satisfactory level in terms of the utilization rate of the mold core, service life and mold repair.

Method used

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  • Vacuum secondary hot pressing manufacturing technology for high-strength polycrystalline diamond drawing die
  • Vacuum secondary hot pressing manufacturing technology for high-strength polycrystalline diamond drawing die
  • Vacuum secondary hot pressing manufacturing technology for high-strength polycrystalline diamond drawing die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] S1. Mix the metal powders evenly according to the mass proportion listed in Example 1 in Table 1;

[0036] 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;

[0037] S3. Weigh the metal powder prepared in unit A S1 and pour it into the steel sleeve, vibrate the graphite mold to make the metal powder even and smooth, insert the graphite pressure column from the upper cavity into the upper mold 1, as image 3 As shown, the graphite pressing column presses the metal powder, and the combination of upper mold 1, lower mold 2, steel sleeve, metal powder and graphite pressing column is put into the sintering machine, and the metal powder is compacted by cold pressing at a pressure of 10MPa on the sintering machine , the compacted metal powder forms the bottom of the insert;

[00...

Embodiment 2

[0045] S1, mix each metal powder evenly according to the mass proportion listed in Example 2 in Table 1;

[0046] 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;

[0047] S3. Weigh the metal powder prepared in unit A S1 and pour it into the steel sleeve, vibrate the graphite mold to make the metal powder even and smooth, insert the graphite pressure column from the upper cavity into the upper mold 1, as 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 at a pressure of 15 MPa on the sintering machine , the compacted metal powder forms the bottom ...

Embodiment 3

[0055] S1, mix each metal powder evenly according to the mass proportion listed in Example 3 in Table 1;

[0056] 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;

[0057] S3. Weigh the metal powder prepared in unit A S1 and pour it into the steel sleeve, vibrate the graphite mold to make the metal powder even and smooth, insert the graphite pressure column from the upper cavity into the upper mold 1, as image 3 As shown, the graphite pressing column presses the metal powder, and the combination of upper mold 1, lower mold 2, steel sleeve, metal powder and graphite pressing column is put into the sintering machine, and the metal powder is compacted by cold pressing at a pressure of 10MPa on the sintering machine , the compacted metal powder forms the bottom of the insert;

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Abstract

The invention discloses a vacuum secondary hot pressing manufacturing technology for a high-strength polycrystalline diamond drawing die. A bushing is obtained by metal powder through vacuum secondary hot pressing, the vacuum degree is 2*10-3-8*10-3 Pa, the pressing pressure is 20-45 MPa, the temperature is increased to 500-550 DEG with the rate of 20-30 DEG C/min, the temperature and the pressure are kept for 10-20min, the temperature is increased to 600-650 DEG C with the rate of 10-15 DEG C/min, the temperature is kept for 10-15 min, the pressure is kept for 15-20 min, and the drawing die is obtained through cooling. The method of vacuum secondary hot pressing is adopted, particles can be scattered and slide through the surface energy and the external pressure, pores in a sintered body are removed, and the compactness of materials is improved; elastic strain in the cold pressing process can be removed, the density of the sintered body can be increased, the elastic failure does not exist, and the adverse influences generated by size increasing after demolding are reduced; the vacuum sintering is neutral sintering of anaerobic and non-reducing gas, combination of interfaces can be improved, and the obtained drawing die bushing is closely attached to a die core and a steel bushing; the gaps of the sintered body can be fully filled with the particles through secondary hot pressing, obtained material cracks are few, and the utilization rate of the die is increased.

Description

technical field [0001] The invention relates to the technical field of wire drawing dies, in particular to a vacuum secondary hot pressing manufacturing process of a high-strength 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 si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/14B22F5/10
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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