Method and die for forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets

An extrusion die, semi-solid technology, applied in metal extrusion die and other directions, can solve the problems of product quality decline, long extrusion time, low production efficiency, etc., to achieve uniform deformation, large deformation, and improve production efficiency. Effect

Inactive Publication Date: 2010-10-06
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires multiple passes of extrusion to refine the magnesium alloy grains to a smaller size, with many procedures, low production efficiency, and high production costs; and the extrusion time of each pass is relatively long. Extrusion speed will reduce the quality of the product

Method used

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  • Method and die for forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets
  • Method and die for forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets
  • Method and die for forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets

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Experimental program
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Effect test

Embodiment 1

[0016] (embodiment 1, the forward extrusion of magnesium alloy semi-solid billet and variable-diameter bending extrusion die) see Figure 1 to Figure 3 , the forward extrusion and variable diameter bending extrusion processing dies for preparing magnesium alloy semi-solid billets in this embodiment include an upper template 1, a punch 2, a die 3, a die cover 4, a heating wire 42, a ceramic tube 43, a pad Block 5, lower template 6 and pressing plate 7.

[0017] The die cover 4 is seated and fixed on the lower template 6, and the lower surface of the die cover 4 is in contact with the upper surface of the lower template 6; the lower part of the space in the middle of the die cover 4 places a spacer 5. The die 3 is provided with a feeding port located at the upper end, the die 3 is arranged above the cushion block 5, and is located in the middle space of the die set 4, and the die 3 and the die set 4 are in clearance fit; the punch 2 is stepped , its upper end is fixedly connect...

Embodiment 2

[0021] (Embodiment 2, the forward extrusion and variable-diameter bending extrusion method of preparing magnesium alloy semi-solid billet) see Figure 4 to Figure 7 , the present embodiment prepares the used extrusion die of the forward extrusion of magnesium alloy semi-solid billet and the extrusion die of variable diameter corner extrusion method, adopts the die obtained in embodiment 1, and what this embodiment handles is AZ91D magnesium alloy cast billet, The method for preparing the magnesium alloy semi-solid billet comprises the following steps: 1. Machining of the magnesium alloy billet: the magnesium alloy cylindrical billet is processed into a cylindrical billet corresponding to the inner diameter of the upper end of the die 3, the diameter of the billet is 50mm, and the height is 120mm.

[0022] ② Pre-deformation of the billet: Preheat the cylindrical billet machined in step ① in a box-type resistance furnace at a preheating temperature of 280°C and keep it warm for ...

Embodiment 3

[0028] (Embodiment 3, the forward extrusion and variable-diameter bending extrusion method of preparing magnesium alloy semi-solid billet) see Figure 8 , the difference between this embodiment and embodiment 2 is: in step ②, the billet processed by step ① is preheated in a box-type resistance furnace, the preheating temperature is 300 ° C, and the heat preservation is 15 minutes, and the extrusion die is preheated When hot, the mold temperature is 240°C, and the pre-deformation temperature of the blank, that is, the temperature of the blank during the pre-deformation process, is 300°C.

[0029] Compared with embodiment 2, the present embodiment increases the pre-deformation temperature, which will make the average grain diameter larger, but the present embodiment reduces the pre-deformation holding time, and correspondingly makes the average grain diameter smaller; compared with embodiment 1, The raising of present embodiment pre-deformation temperature and the reduction of p...

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Abstract

The invention discloses a method and a die for the forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets. The preparation method comprises a predeformation process and an isothermal spheroidizing heat treatment process, wherein in the predeformation process, uniform deformation of large deformation amount is realized by the die for the forward extrusion and variable diameter bending extrusion; cutting a magnesium alloy bar stock which is subjected to large deformation by a fixed size; heating the magnesium alloy bar stock cut by the fixed size at the temperature of between 520 and 580 DEG C under the protection of argon, and keeping the temperature of the obtained magnesium alloy bar stock for 10 to 30 minutes; and processing a bending extrusion angle of the die to be over 90 degrees. The method has the advantages of small predeformation resistance, large and uniform deformation, safety, reliability and no three-waste pollution. The grains of the prepared magnesium alloy semi-solid billets have fine size, are uniform and have a shape close to that of a sphere. The method solves the problem that the conventional SIMA method cannot continuously prepare the large-size semi-solid billets and meets the requirements of the semi-solid thixoforming workpieces for large-scale continuous production.

Description

technical field [0001] The invention belongs to the field of extrusion deformation of magnesium alloys, in particular to an extrusion deformation processing method and a processing die for improving the mechanical properties of magnesium alloys. Background technique [0002] Magnesium alloys have become an important component of automobiles, aerospace and electronic communications due to their high specific strength, specific stiffness, shock absorption, wear resistance, thermal conductivity, electromagnetic shielding, easy cutting and easy recycling and other good comprehensive properties. Important new materials in other industries. Today, with increasingly severe energy and resource issues and increasingly prominent environmental protection issues, magnesium alloys are known as "green engineering structural materials in the 21st century", and lightweight magnesium alloys with good comprehensive properties are becoming a global focus. With the increasing application propo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02B21C23/04B21C29/04
Inventor 田文彤唐国兴肖华星杨辉曹霞
Owner CHANGZHOU INST OF TECH
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