A method and device for in-situ preparation and molding of aluminum/magnesium alloy semi-solid slurry

A technology of semi-solid slurry and forming device, which is applied in the field of in-situ heating preparation and extrusion casting of aluminum/magnesium alloy semi-solid slurry, which can solve the problem of temperature inhomogeneity, heating temperature of long ingot, heating to reduce electromagnetic induction Heating rate and other problems, to achieve the effect of short transfer time, small heat loss and solving large heat loss

Active Publication Date: 2021-12-17
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the "skin effect" of electromagnetic induction heating, the temperature of the surface of the ingot is significantly higher than that of the core during heating, that is, the temperature of the ingot is severely inhomogeneous when heated by electromagnetic induction
This heating inhomogeneity significantly reduces the electromagnetic induction heating rate, that is, in order to obtain a uniform temperature, a longer ingot heating temperature is required, such as "automatic continuous secondary heating device for semi-solid metal blanks" (CN201310521522.1 ) The disclosed preparation method needs 10 minutes to obtain the ideal semi-solid slurry

Method used

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  • A method and device for in-situ preparation and molding of aluminum/magnesium alloy semi-solid slurry
  • A method and device for in-situ preparation and molding of aluminum/magnesium alloy semi-solid slurry
  • A method and device for in-situ preparation and molding of aluminum/magnesium alloy semi-solid slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This example is the preparation of A356.2 aluminum alloy automobile wheel hub by in-situ heating preparation of aluminum / magnesium alloy semi-solid slurry and extrusion casting molding method. The schematic diagram of the device used is as figure 1 and image 3 As shown, the schematic diagram of the process principle is shown in figure 2 shown.

[0062] The aluminum / magnesium alloy semi-solid slurry in-situ heating and squeeze casting molding device includes a squeeze casting machine and a mold with a semi-solid slurry in-situ heating system arranged in the squeeze casting machine. A mold with a semi-solid slurry in-situ heating system includes an upper mold 18, a lower mold 24, a side mold 22 and a mold cavity 23 formed therefrom, and the center of the upper mold 18 is provided with a semi-solid blank connected to the mold cavity an in-situ heating chamber, an in-situ heating system is arranged outside the in-situ heating chamber for the semi-solid billet / slurry; ...

Embodiment 2

[0085] This example is the preparation of AZ91D magnesium alloy automobile wheel hub by in-situ heating preparation of aluminum / magnesium alloy semi-solid slurry and extrusion casting molding method.

[0086] The equipment that adopts is identical with embodiment 1. The AZ91D semi-solid billet has a diameter of 200mm and a height of 150mm, which is prepared by electromagnetic stirring semi-continuous casting.

[0087] Concrete preparation steps are as follows:

[0088] Step 1: Loading of semi-solid billet: 16-inch magnesium alloy automobile wheel mold is closed under the action of a 350-ton squeeze casting machine oil cylinder. The wheel mold is composed of upper, lower, left and right parts. The initial temperature of the mold is 300-350 °C . After the mold is closed, the supporting plate is moved up until its upper surface is flush with the upper surface of the upper mold seat plate, and the preheated magnesium alloy semi-solid blank (solid) is put in by the manipulator. T...

Embodiment 3

[0100] Using the equipment and method shown in Example 1, the A365.2 ingot with a diameter of 200 mm and a height of 150 mm is used to heat the semi-solid slurry in situ to prepare the semi-solid slurry, and the liquid phase ratio can be obtained in 6 minutes. 55% semi-solid slurry. And the disclosed semi-solid slurry of existing device (the semi-solid metal blank automatic continuous secondary heating device disclosed in CN201310521522.1) The preparation time is 10 minutes, and it can be seen that the semi-solid slurry pulping time shortened by more than 40% by adopting the equipment of the present invention.

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Abstract

The invention provides a method and device for in-situ preparation and molding of aluminum / magnesium alloy semi-solid slurry. The device includes a squeeze casting machine and an in-situ heating system with semi-solid slurry arranged in the squeeze casting machine The mold includes an upper mold, a lower mold, a side mold and a mold cavity formed by the upper mold, the center of the upper mold is provided with a semi-solid blank in-situ heating cavity connected to the mold cavity, and the semi-solid blank / The outside of the slurry in-situ heating chamber is equipped with an in-situ heating system. The forming method includes: A. loading of semi-solid billet; B. preparation of semi-solid slurry; C. extrusion casting of semi-solid slurry; D. opening mold and taking out casting. The method can effectively reduce the heat loss in the transfer process of the semi-solid slurry, improve the formability and process stability of the semi-solid slurry, shorten the time required for the preparation of the semi-solid slurry by electromagnetic induction heating, and significantly reduce the equipment of the squeeze casting machine. Cost, and at the same time more conducive to the realization of mechanization and safe production.

Description

technical field [0001] The invention belongs to the technical field of metal semi-solid processing, and in particular relates to an aluminum / magnesium alloy semi-solid slurry in-situ heating preparation and extrusion casting molding method and equipment. Background technique [0002] Metal semi-solid processing technology is a new processing and forming method between traditional solid processing technology (such as extrusion, forging, rolling) and liquid forming (such as casting). Since semi-solid metal contains liquid metal and solid metal at the same time, compared with solid-state processing, semi-solid processing has less forming resistance and can form more complex shapes; compared with liquid forming, the alloy temperature is lower during semi-solid processing. Oxidation resistance Significantly increased, the content of shrinkage defects is significantly reduced, and the semi-solid metal has a high viscosity and is not easy to be involved in gas during molding; the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/02B22D18/08
CPCB22D18/02B22D18/08
Inventor 范鹏付彭怀郑飞燕彭立明
Owner SHANGHAI JIAOTONG UNIV
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