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Equal channel angular pressing method and device

A technology of equal channel extrusion and extrusion channel, which is applied in the field of metal strong deformation, can solve the problems of small deformation and low extrusion efficiency, increase radial strain, ensure coordination, and facilitate repair and replacement Effect

Active Publication Date: 2020-02-07
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current equal-channel extrusion method mainly makes the billet shear deformation at the corner of the die, but the deformation amount of each extrusion is relatively small, and repeated extrusion is required, and the extrusion efficiency is low

Method used

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  • Equal channel angular pressing method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0050] For a cylindrical 5A06 aluminum alloy billet with a diameter of 20mm and a height of 35mm, four passes of equal-channel extrusion are carried out at a temperature of 250°C for strong deformation. The specific operations are as follows:

[0051]S1. Place a piece of billet A in the upper extrusion die 2, and extrude the billet A with the extrusion head 1;

[0052] S2. When the blank A is squeezed into the lower extrusion die 3, such as figure 2 As shown, the pulsation device is started at this time, the left and right pulsation pumps act synchronously, and the left and right hydraulic cylinders are driven to act synchronously. Billet, due to its yield strength σ s Different, the left and right pulsation distances are different, the pulsation distance S of the upper extrusion die 2 is calculated according to the empirical formula. Material yield strength σ s The larger the , the smaller the pulsation distance S and the slower the pulsation. According to the empirical ...

Embodiment 2

[0064] For a cylindrical WE94 magnesium alloy billet with a diameter of 20mm and a height of 35mm, four passes of equal-channel extrusion are carried out at a temperature of 300°C for strong deformation. The specific operations are as follows:

[0065] S1. Place a piece of billet A in the upper extrusion die 2, and at this time, the extrusion head 1 extrudes the billet A;

[0066] S2. When the blank A is squeezed into the lower extrusion die 3, such as figure 2 As shown, the pulsation device is started at this time, the left and right pulsation pumps act synchronously, and the left and right hydraulic cylinders are driven to act synchronously. For magnesium alloy, its yield strength is about 300MPa, and the front and rear pulse distance is taken as 0.1mm.

[0067] S3. When the blank A is completely squeezed into the lower extrusion die 3, turn off the pulsation device, put the blank B into it, and continue extrusion;

[0068] S4. When the blank B is squeezed into the lower ...

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Abstract

The invention discloses an equal channel angular pressing device and a pressing method. The device comprises an upper pressing female die with a T-shaped protrusion at the bottom and a lower pressingfemale die with a T-shaped groove matching the T-shaped protrusion, wherein the upper pressing female die and the lower pressing female die are combined to form an L-shaped pressing channel, and the corner of the pressing channel are located at the lower pressing female die, the vertical portion of the pressing channel is provided with an pressing head for pressing a blank into the pressing channel, the upper pressing female die is provided with a pulsation device capable of driving the upper pressing female die to pulse left and right, the pulsation device comprises a pulsation pump, a hydraulic cylinder and a connecting rod which are sequentially connected, and the connecting rod is fixedly connected with the upper pressing female die. According to the method and device, the pulsation pump drives the hydraulic cylinder to drive the upper pressing female die to pulse left and right, so that the blank generates shear deformation in the radial direction before entering the corner of thepressing channel.

Description

technical field [0001] The invention relates to an equal-channel extrusion method and device, belonging to the technical field of metal strong deformation. Background technique [0002] Equal channel extrusion (ECAP) is a plastic processing method for preparing micro-nano grain bulk materials through strong deformation and refining grains. The preparation process is to extrude the material from the extrusion channel through the extrusion head. The material Shear deformation occurs at the corner of the extrusion channel, and the grains are refined due to large deformation. Through repeated extrusion, the material can accumulate a large strain, the grains are refined to the micro-nano level, and the strength of the material is greatly improved. The current equal-channel extrusion method is mainly to cause the billet to shear and deform at the corner of the die, but the deformation amount of each extrusion is relatively small, and repeated extrusion is required, and the extrusi...

Claims

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Application Information

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IPC IPC(8): B21C25/02B21C23/04B21C31/00
CPCB21C23/002B21C23/04B21C25/02B21C31/00
Inventor 张春祥刘卫鹏刘亮张丽丽骆俊廷
Owner YANSHAN UNIV
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