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Preparation technology and device of superfine (fine) crystal bar

A technology of rods and feeding devices, applied in the direction of metal extrusion dies, etc.

Active Publication Date: 2015-04-22
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose is to effectively overcome the problems existing in the existing severe plastic deformation device suitable for continuous production, and at the same time establish a method for isothermal severe plastic deformation of rods

Method used

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  • Preparation technology and device of superfine (fine) crystal bar
  • Preparation technology and device of superfine (fine) crystal bar
  • Preparation technology and device of superfine (fine) crystal bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0024] Raw material: φ80mm aluminum alloy 7A04 bar

[0025] The specific process is as follows:

[0026] (1) First, heat the mold heating temperature to 400°C through the built-in resistance;

[0027] (2) The billet is continuously heated by an external induction heating device, with a maximum temperature of 450°C, and the heating power of the external induction heating device is determined by the feed rate and the thermal and physical parameters of the billet;

[0028] (3) The material is fed by the multi-step feeding device. When the billet enters the forming port 0.5~5mm, the multi-step feeding device stops feeding;

[0029] (4) After the upper die moves downward, the pressing block of the retreating device also moves down with the upper die and touches the blank before the upper die, and exerts a certain pressure on the billet before deformation, so that the undeformed area of ​​the billet is in a relatively Stationary state;

[0030] (5) Aft...

Embodiment example 2

[0033] Raw material: φ80mm magnesium alloy MB15 bar

[0034] The specific process is as follows:

[0035] (1) First, heat the mold heating temperature to 320°C through the built-in resistance;

[0036] (2) The billet is continuously heated by an external induction heating device, with a maximum temperature of 410°C, and the heating power of the external induction heating device is determined by the feed rate and the thermal physical properties of the billet;

[0037] (3) The material is fed by the multi-step feeding device. When the billet enters the forming port 0.5~5mm, the multi-step feeding device stops feeding;

[0038] (4) After the upper die moves downward, the pressing block of the retreating device also moves down with the upper die and touches the blank before the upper die, and exerts a certain pressure on the billet before deformation, so that the undeformed area of ​​the billet is in a relatively Stationary state;

[0039] (5) After ...

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PUM

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Abstract

The invention discloses a preparation technology and a device of a superfine (fine) crystal bar, belongs to the field of metal plastic formation, and particularly discloses an isothermal continuous dramatic plastic deformation technology for obtaining the superfine (fine) crystal bar. The isothermal continuous dramatic plastic deformation technology is characterized in that an isothermal continuous dramatic deformation device and a process control method are provided. The technology is used for effectively solving the problem that an existing equal-channel angular extrusion technology can only be used for preparing short blanks; an extrusion bar is suitable for acting as a blank to prepare the bar with superfine (fine) crystal length; the preparation technology and the device can be used for industrial continuous production.

Description

technical field [0001] The invention relates to a method for preparing ultrafine (fine) grain rods, in particular to a continuous violent isothermal deformation method for long rods, and belongs to the field of material processing engineering / forging / extrusion forming. Background technique [0002] Severe plastic deformation is the main method for preparing ultrafine (fine) grain materials. The basic method is to process a connected vertical cavity and lateral cavity mold. The angle between the vertical cavity and the centerline of the lateral cavity is about 90° , the fillet radius at the corners of the vertical cavity and the lateral cavity is only 0.5~2mm, the billet produces a huge shear deformation during the extrusion process, and the equivalent strain reaches more than 0.8, which makes the grain of the billet fine change. Typical severe plastic deformation processes are Equal-Channel Angular Pressing (ECAP) with single shear deformation and Multi-pass ECAP ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/08B21C25/02B21C29/00B21C29/04
Inventor 林军陈强夏祥生舒大禹康凤黄树海胡传凯赵祖德
Owner NO 59 RES INST OF CHINA ORDNANCE IND