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Vacuum secondary hot pressing manufacturing process of a high-strength polycrystalline diamond wire 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, elimination of elastic strain, and reduction of particle size.

Inactive Publication Date: 2018-03-27
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 process of a high-strength polycrystalline diamond wire drawing die
  • Vacuum secondary hot pressing manufacturing process of a high-strength polycrystalline diamond wire drawing die
  • Vacuum secondary hot pressing manufacturing process of a high-strength polycrystalline diamond wire 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 manufacturing process of a high-strength polycrystalline diamond wire drawing die by vacuum secondary hot pressing. The insert is obtained by vacuum secondary hot pressing of metal powder: The pressure is 20-45MPa, the temperature is raised to 500-550°C at a rate of 20-30°C / min, the temperature is kept for 10-20min, the temperature is raised to 600-650°C at a rate of 10-15°C / min, and the heat is kept for 10-15min , hold the pressure for 15-20 minutes and cool to obtain a wire drawing die. The invention adopts the method of vacuum secondary hot pressing to improve the density of the material; it can eliminate the elastic strain in the cold pressing process and reduce the adverse effect of size increase after demoulding; the vacuum sintering is neutral sintering without oxygen and reducing gas , so that the obtained wire drawing die insert fits closely with the die core and the steel sleeve; the secondary hot pressing makes the particles fully fill in the gap of the sintered body, improving the utilization rate of the die.

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 Patents(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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