Reciprocating extrusion upsetting device and its using method and application

A pie-shaped, punch technology, applied in forging/pressing/hammer devices, manufacturing tools, forging/pressing/hammering machines, etc., can solve the problems of easy cracking and restrict application, and reduce the tendency of cracking and grain size. Small dispersion, avoiding the effect of squeezing dead zone

Active Publication Date: 2017-07-11
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at this time, the circumferential flow of the billet belongs to the free flow without back pressure, and it is easy to crack at the parting surface of the plastic flow, that is, the block material produced by this device inevitably has macro cracks.
The above two shortcomings severely restrict the application of this method in ultrafine-grained bulk materials

Method used

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  • Reciprocating extrusion upsetting device and its using method and application
  • Reciprocating extrusion upsetting device and its using method and application
  • Reciprocating extrusion upsetting device and its using method and application

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Embodiment 1

[0037] The present invention provides a reciprocating extruding device for preparing ultra-fine crystal cake-shaped materials, its structure is as shown in the figure figure 1 , figure 2 and image 3 As shown, it includes: an upper punch 1, a die 2, a lower punch 3, a base 4, and a pad 5; the base 4 is detachably arranged at the bottom of the die 2, and the die 2 is provided with a necking area. The necking area divides the interior of the die 2 into an upper cavity 7 and a lower cavity 8 that communicate with each other; the inner side of the bottom of the upper cavity 7 is arc-shaped with an extrusion port; the inner side of the lower cavity 8 is also arc-shaped , the arc inside the upper cavity 7 has the same radius as the arc inside the lower cavity 8 .

[0038] The lower end of the upper punch 1 cooperates with the bottom end of the upper cavity 7 of the die 2, and the upper end of the upper punch 1 cooperates with the inner step 9 of the upper cavity 7 of the die 2, w...

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Abstract

The invention provides a reciprocating extrusion and heading device for preparing ultrafine crystal cake-shaped materials, which includes an upper punch, a die, a lower punch and a base, the base is detachably arranged at the bottom of the die, and the die The mold is provided with an upper cavity and a lower cavity that communicate with each other, and the inner side of the bottom of the upper cavity is arc-shaped with an extrusion port, the inner side of the lower cavity is also arc-shaped, and the inner side of the upper cavity is curved. The arc has the same radius as the arc on the inside of the lower cavity. The present invention has the following beneficial effects: the constriction area of ​​the die of the present invention adopts a circular arc transition, which effectively avoids the slow and uneven extrusion dead zone in conventional extrusion, uniform strain distribution, and small grain dispersion.

Description

technical field [0001] The invention relates to a method in the technical field of plastic forming, in particular to a reciprocating extrusion device and a processing method for preparing ultrafine crystal cake-shaped materials. Background technique [0002] Ultrafine-grained materials are high-performance materials that combine excellent strength and good plasticity and toughness. The large plastic deformation technology (SPD) has a remarkable grain refinement ability, and is recognized as the most promising method for preparing ultrafine grain (grain size 100nm-1um) and bulk nanometer (grain size less than 100nm) materials. method. [0003] After searching the literature of the prior art, it was found that the utility model patent "reciprocating extrusion device for preparing ultra-fine-grained materials" (patent number: ZL200720075526.1) discloses a reciprocating extrusion device, which can significantly refine the grain , but the mold structure determines that the reci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J13/02B21J5/00
Inventor 张利王渠东周浩刘腾
Owner SHANGHAI JIAOTONG UNIV
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