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Counter-pressure casting process for ZL424 aluminum alloy castings

A ZL424, aluminum alloy casting technology, applied in the field of metal casting technology, can solve the problems of weak thickness sensitivity, poor casting process, low alloy fluidity, etc., to reduce pinhole defects, improve casting quality, and improve mechanical properties Effect

Active Publication Date: 2013-01-16
TIANJIN NAVIGATION INSTR RES INST
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  • Abstract
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Problems solved by technology

This alloy casting is usually prepared by gravity casting method at present, but the casting alloy has low fluidity, high hot cracking tendency, high alloy shrinkage rate, and poor casting process, but its thickness sensitivity is not strong, and it is easy to hot cracking , easy to produce defects such as pinholes and shrinkage porosity, and the survival rate of gravity casting products is low

Method used

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  • Counter-pressure casting process for ZL424 aluminum alloy castings
  • Counter-pressure casting process for ZL424 aluminum alloy castings
  • Counter-pressure casting process for ZL424 aluminum alloy castings

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Embodiment Construction

[0047] The following describes the embodiment of the present invention in detail in conjunction with the data. It should be noted that the embodiment is descriptive, not restrictive, and cannot limit the protection scope of the present invention.

[0048] A ZL424 aluminum alloy casting differential pressure casting process, comprising the following steps:

[0049] ⑴. Casting alloy alloy ingredients

[0050] The batching of casting alloy comprises Zn, Mg, Mn, Ti and Al, and the weight percent of each batching is:

[0051]

[0052] The balance is Al.

[0053] Above-mentioned impurity comprises Fe, Si, Cu, Be and Zr, and each impurity accounts for the percentage by weight of alloy batching gross weight as:

[0054]

[0055] ⑵. The alloy is smelted by secondary refining and intermediate purification

[0056] 1) Preparation of smelting tools: the main smelting equipment is an intermediate frequency induction furnace, commonly used smelting tools such as skimming spoons, samp...

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Abstract

The invention relates to a counter-pressure casting process for ZL424 aluminum alloy castings. The process includes the steps: (1) alloy burdening; (2) using secondary refining and intermediate purifying for smelting alloy; (3) using a counter-pressure casting method for preparing ZL424 aluminum alloy castings; (4) cleaning the ZL424 aluminum alloy blank castings prepared at the step (3) before heat treatment; (5) checking the ZL424 aluminum alloy blank castings subjected to heat treatment. Blank castings prepared by the counter-pressure casting process overcome defects of ZL424 aluminum alloy castings obtained by traditional gravity casting methods, internal pinholes, microscopic shrinkage porosity and microcracks of castings are eliminated, and chemical component acceptability, mechanical performance and compactness of the castings are improved. In addition, the process has the advantages of high efficiency, high casting yield, low manufacturing cost and the like.

Description

technical field [0001] The invention relates to the technical field of metal casting technology, in particular to a ZL424 aluminum alloy casting differential pressure casting technology. Background technique [0002] Aluminum-zinc-magnesium alloy (ZL424 aluminum alloy) is optimized on the basis of American grade 707.0 and Russian grade A л24 cast aluminum alloy. This cast aluminum alloy has high mechanical properties and good cutting performance. Good performance, especially high dimensional stability can be obtained after certain heat treatment specifications, so it is suitable for casting materials of high-precision navigation system platform structural parts. This alloy casting is usually prepared by gravity casting method at present, but the casting alloy has low fluidity, high hot cracking tendency, high alloy shrinkage rate, and poor casting process, but its thickness sensitivity is not strong, and it is easy to hot cracking , It is easy to produce defects such as pin...

Claims

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Application Information

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IPC IPC(8): B22D18/04B22D21/04C22C21/10C22C1/02C22C1/06
Inventor 曲嘉吕振玉朱玲田洪超马明山蔡竞张群
Owner TIANJIN NAVIGATION INSTR RES INST
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