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An electric field assisted titanium alloy micro-gear extrusion die and method thereof

An electric field-assisted extrusion molding technology, which is applied to metal extrusion dies and other directions, can solve problems such as short life, complex mold structure, and uneven density distribution of finished products.

Active Publication Date: 2021-05-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide an electric field-assisted titanium alloy micro-gear extrusion die and its method, to solve the problem of low heating efficiency and complex die structure in existing titanium alloy micro-gear die forging , high cost, mold stress concentration, short life and uneven density distribution of finished products

Method used

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  • An electric field assisted titanium alloy micro-gear extrusion die and method thereof
  • An electric field assisted titanium alloy micro-gear extrusion die and method thereof
  • An electric field assisted titanium alloy micro-gear extrusion die and method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1, reference figure 1 , the electric field-assisted titanium alloy micro-gear extrusion molding die of this program includes a punch 1, an inner sleeve 2, a die 4 and a top die.

[0044] The upper end of the inner sleeve 2 is provided with a through hole for filling titanium alloy blanks. The conical surface at the upper end of the through hole matches the taper at the lower end of the punch 1; In the counterbore at the top of the top mold.

[0045] Among them, the punch 1 has a large chamfer at the sudden change in structure, which can enhance the strength of the punch 1 and reduce stress concentration.

[0046] The large chamfer at the assembly end of the inner sleeve 2 and the punch 1 serves as a guiding structure, the lower end of the through hole where the inner sleeve 2 installs the titanium alloy blank 3 and the punch 1 is conical, and the other end is a counterbore structure.

[0047] The cavity of die 4 is a through structure, and the modulus and ...

Embodiment 2

[0059] Embodiment 2, an electric field-assisted extrusion molding method of titanium alloy microgears, comprising:

[0060] S1. Under the pressure of 55MPa~70MPa, the titanium alloy billet is pre-extruded to reduce the porosity of the titanium alloy billet by 5%-9%, so as to increase the density of the original billet;

[0061] In traditional compression molding, whether it is one-way or two-way pressing, there will be uneven distribution of billet density and high residual porosity. However, the present invention adopts pre-extrusion before molding, and the relative density of the final formed microgear can be If it is increased by more than 10%, the porosity is relatively reduced by 7%.

[0062] S2. In a vacuum environment, at a heating rate of 25°C / s-40°C / s, heat the titanium alloy billet to 400°C-500°C, keep it warm for 0.5h, reduce the pressure to 0.01-0.03MPa, and degas the titanium alloy billet ;

[0063] Preheat the raw material of titanium alloy billet to reach a te...

Embodiment 3

[0075] Embodiment 3, verify the correctness of the process of the present invention:

[0076] S1. Pre-extruding the titanium alloy billet 3 under a pressure of 55MPa to 70MPa to reduce the porosity of the billet by 8%;

[0077] S2. In a vacuum environment, at a heating rate of 25°C / s-40°C / s, heat the titanium alloy blank 3 to 400°C-500°C, keep it warm for 0.5h, reduce the pressure to 0.01-0.03MPa, and carry out the titanium alloy blank 3 outgassing;

[0078] S3. Fill the titanium alloy blank 3 into the through hole of the inner sleeve 2, the punch 1 is assembled in the inner sleeve 2, the die 4 is assembled in the counterbore structure at the bottom of the inner sleeve 2, and then the inner sleeve 2 is assembled on the top In the counterbore structure at the upper end of the mold; then the mold containing the titanium alloy blank 3 is installed in the forming chamber;

[0079] S4. Install the mold containing the titanium alloy blank in a molding chamber with a vacuum degree ...

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Abstract

The invention discloses an electric field assisted titanium alloy micro-gear extrusion molding die and a method thereof, comprising a punch, an inner sleeve, a die and a top die; the upper end of the inner sleeve is provided with a through hole for filling titanium alloy blanks , the conical surface at the upper end of the through hole matches the taper at the lower end of the punch; the die is assembled in the counterbore at the bottom of the inner sleeve, and the bottom of the inner sleeve is installed in the counterbore at the upper end of the top mold. According to the phase transition point and grain size, the present invention adopts multi-step and multi-stage plastic extrusion molding, and the extrusion molding is divided into three times, and the pressure first increases and then decreases. Compared with the traditional one-time extrusion molding, the present invention can reduce the pressure The attenuation and stress concentration during the extrusion process can effectively improve the uniformity of the axial density distribution of the micro-gear during the molding process, ensure a clear molding interface, no cracks, and improve the extrusion quality, and the mold is subjected to unidirectional extrusion. The service life is long, and the length-to-diameter ratio of the micro-gear can be adjusted arbitrarily.

Description

technical field [0001] The invention belongs to the technical field of micro-part manufacturing and micro-plastic molding, and in particular relates to an electric-field-assisted titanium alloy micro-gear extrusion molding die and a method thereof. Background technique [0002] With the continuous development of modern science and technology, the miniaturization of products has become a trend, and the demand for micro-machines and micro-electro-mechanical systems in cutting-edge science and technology is increasing. Its applications include biomedical engineering, electronic components, aerospace, precision instruments, weapons and other fields. For example, tubular micro-robots, micro-guns, micro-mechanical flying bugs (also known as "spy flies"), etc. Due to their small size, components must also be miniaturized. As a widely used mechanical transmission part, gear has the advantages of stable transmission, large speed and power adjustment range, and compact structure. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02B21C23/14B21C29/04
CPCB21C23/14B21C25/02B21C25/025B21C29/04
Inventor 黄坤兰阎相忠杨屹
Owner SICHUAN UNIV
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