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Extrusion-ECAP extrusion deformation device and method for preparing fine-grained material

A technology of extrusion deformation and fine grain, which is applied in the field of material processing, can solve the problems of short material length and inability to be widely used in engineering fields, and achieve the effect of improving material strength, meeting requirements, and fine grain size

Inactive Publication Date: 2020-01-14
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the length of the material obtained by this method is generally short and limited by the mold, so it cannot be widely used in the engineering field

Method used

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  • Extrusion-ECAP extrusion deformation device and method for preparing fine-grained material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 As shown, the device of the present invention comprises an upper mold 1 and a lower mold 2, and the lower mold 2 is provided with an extruding cylinder 3 for placing materials, and the bottom of the upper mold 1 is provided with an extrusion cylinder 3 top open end for inserting and displacing the material. The punch 4 that is extruded from the outlet end of the bottom of the extrusion cylinder 3; the lower die 2 also includes an equal-diameter extrusion channel 5 located in the lower mold 2; wherein, the bottom of the extrusion cylinder 3 has a diameter that gradually decreases Funnel-shaped 6, the outlet end of the bottom of the extruding cylinder 3 is docked with the inlet end of the extrusion channel 5, and the middle part of the extrusion channel 5 is a knuckle 7 that is set at an angle, and the outlet end of the extrusion channel forms an outlet on the outer wall of the lower die.

[0030] In this embodiment, more specifically, the lower mold 2 is...

Embodiment 2

[0036] (1) Melting in a vacuum induction melting furnace protected by argon, and then casting to obtain qualified magnesium alloy ingots;

[0037] (2) After heating the heat treatment furnace to about 400°C, put in the magnesium alloy ingot, keep it warm for 12 hours, and perform homogenization heat treatment to eliminate microsegregation;

[0038] (3) Cool the material to room temperature with the heat treatment furnace, and then machine it into an extrusion billet;

[0039] (4) Preheat the extrusion billet to 250°C, apply a lubricant on the surface of the billet and the inner surface of the extrusion cylinder, and then put the billet into the extrusion cylinder for extrusion, so that the extrusion deformation and ECAP deformation of the billet occur , to obtain a rod of Φ8mm×100cm, the extrusion temperature is 250°C, the extrusion rate is 4mm / s, and the extrusion ratio is 25;

[0040] (5) The extruded bar is subjected to solution annealing, the annealing process is 410°C fo...

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Abstract

The invention discloses an Extrusion-ECAP extrusion deformation device and a method for preparing a fine-grained material. A lower die (2) is internally provided with an extruding cylinder (3) for placing the material, a male die (4) for being inserted from the top opening end of the extruding cylinder (3) and enabling the material to be extruded from the bottom outlet end of the extruding cylinder (3) is arranged at the bottom of an upper die (1), and the lower die (2) further comprises an equal-diameter extrusion channel (5) located in the lower die (2); the bottom outlet end of the extruding cylinder (3) is butted with the inlet end of the extrusion channel (5), a bending angle (7) is formed in the middle of the extrusion channel (5), and the outlet end of the extrusion channel (5) forms an outlet in the outer wall of the lower die (2). The method includes the steps that (1) a layer of lubricant is applied to the inner wall of the extruding cylinder (3) and the surface of a metal rod blank, and a rod is put into the extruding cylinder (3); (2) the rod is extruded, and deformation occurs when the rod passes through the bending angle (7) in the middle of the extrusion channel (5);and (3) annealing is performed to obtain the fine-grained material.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to an Extrusion-ECAP extrusion deformation device and a method for preparing fine-grained materials. Background technique [0002] Grain refinement through deformation treatment of materials is a method to significantly improve the strength and plasticity of materials. The prior art mainly contains following two kinds: [0003] (1) Extrusion deformation process: [0004] Plastic flow is generated by extruding the material, thereby improving the structure and mechanical properties of the material. After extrusion deformation, a certain length of material that meets the requirements of engineering can be obtained, but the effect of grain refinement is unstable after extrusion deformation, so the strength and plasticity of the obtained material cannot meet the application requirements. [0005] (2) Equal channel extrusion process (ECAP): [0006] The diameter of the m...

Claims

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Application Information

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IPC IPC(8): B21C23/21B21C25/02B21C23/32
CPCB21C23/21B21C23/32B21C25/02
Inventor 丁雨田高钰璧张鸿飞郭廷彪陈建军王兴茂
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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