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Semi-Solid Squeeze Die Casting Method

A semi-solid extrusion and semi-solid slurry technology, applied in the field of semi-solid extrusion die casting, can solve problems such as strength limitation, achieve the effect of solving the foaming problem and improving the mechanical properties

Active Publication Date: 2017-03-22
ZHUHAI RUNXINGTAI ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the internal structure and grain structure, the strength of extrusion die casting after heat treatment is limited to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] Embodiment semi-solid extrusion die-casting method

[0037] method one:

[0038] Use a melting furnace to melt the silicon-aluminum ingot into a silicon-aluminum alloy solution, and add a powder refining agent when the silicon-aluminum alloy solution is 690°C; the melting furnace is a 120KW double-connected graphite crucible furnace;

[0039] The silicon-aluminum alloy solution is degassed by introducing nitrogen gas at a pressure of 0.05Mpa, so that the density of the silicon-aluminum alloy solution is greater than 2.6g / cm 3 , hydrogen content < 0.2cc / 100g, after degassing, let the silicon-aluminum alloy solution stand for 10 minutes, and skim off the scum.

[0040] (1) Stir the silicon-aluminum alloy solution at a temperature of 675°C to make a semi-solid slurry, wherein the stirring speed is 200rpm, the cooling air pressure is 1.5kg, the cooling air flow rate is 20L / min, and the stirring time is 10s , making the solid content in the semi-solid slurry of silicon-a...

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Abstract

The invention provides a semisolid extrusion die-casting method. The method comprises the following steps: 1, making molten alloy into semisolid alloy slurry, and maintaining the slurry temperature within the range from 570 DEG C to 620 DEG C; 2, using an extrusion die-casting machine for making the semisolid alloy slurry at the temperature of 570-620 DEG C into alloy castings through injection, wherein the injection speed is 0.05-0.35 m / s. According to the semisolid extrusion injection method, by controlling the extrusion speed and the temperature of the semisolid slurry reasonably, the blistering problem generated after the heat treatment is conducted on extrusion die-casting products can be solved, the qualification rate of the extrusion die-casting products obtained after the heat treatment is made to be over 95%, and the mechanical property of the extrusion die-casting products obtained after the heat treatment can be effectively improved.

Description

technical field [0001] The invention relates to a semi-solid extrusion die-casting method. Background technique [0002] The semi-solid die-casting process developed in the early 1970s brought profound changes to the traditional die-casting process. Scholars at home and abroad have proposed many techniques for the preparation of semi-solid metal pastes, such as mechanical stirring, controlled solidification, and strain activation. The semi-solid slurry with a certain solid content prepared by these pulping processes is die-casted on a die-casting machine to form a semi-solid casting. The semi-solid casting has a dense spherical grain structure and a small thermal deformation of the product, which can produce thin-walled products. Generally, semi-solid products are not suitable for T6 heat treatment to improve the strength of castings. [0003] Squeeze casting, also known as liquid film forging, is a process that applies high mechanical pressure to the liquid alloy injected...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/00
Inventor 任怀德张莹王继成李谷南
Owner ZHUHAI RUNXINGTAI ELECTRICAL