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Investment casting pouring method of thin-wall aluminum alloy casting

An aluminum alloy casting and investment casting technology, which is applied in the pouring process field of investment casting of thin-walled aluminum alloy castings, can solve the problems of insufficient pouring corners, high scrap rate, and unguaranteed product quality, so as to reduce cooling speed and improve Fluidity, effect of eliminating pinholes and shrinkage defects

Inactive Publication Date: 2015-04-08
GUIZHOU HONGLIN MACHINERY
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, for thin-walled castings with a wall thickness (or partial wall thickness) less than 1.5mm, when precision casting is carried out at a mold shell pouring temperature of 100-300°C, most of the thin-walled parts have "undercasting (unclear edges and corners)" Defects lead to unguaranteed product quality and high scrap rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] The casting material of the disc-shaped impeller is: ZL101.

[0017] Disc-shaped impeller investment casting mainly includes the following steps:

[0018] 1. Manufacture of formwork:

[0019] The manufacture of the formwork proceeds in the following steps:

[0020] Step 1. First, press the wax mold at a temperature of 50-56°C in the wax injection pipe. After the wax mold is taken out, immediately put it in a special shaping tool to cool it to prevent the wax mold from deforming;

[0021] Step 2, the wax pattern is assembled and welded;

[0022] Step 3: Carry out shell making (slurry, sand covering) and drying of the assembled and welded modules in an environment with a temperature of 24±2°C and a humidity of 40-70%;

[0023] Step 4: Dewaxing the module to obtain a mold shell. The module is dewaxed by steam, the dewaxing steam pressure is 0.55-0.75 MPa, and the time is 8-12 minutes.

[0024] 2. Mold shell roasting:

[0025] The baking temperature of the ...

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PUM

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Abstract

The invention discloses an investment casting pouring method of a thin-wall aluminum alloy casting. In the method, before casting pouring, a formwork is heated to a relatively high temperature (700+ / -50 DEG C), so that the cooling speed of alloy liquid is reduced, and the alloy liquid can completely fill a formwork cavity for sure so as to obtain a casting with a qualified shape; and moreover, the poured casting is taken out of the formwork and then immediately put on a cooling bracket to be forcibly and quickly cooled, and thus the defects of pinholes and shrinkage porosity of the casting can be eliminated.

Description

technical field [0001] The invention relates to a pouring process for investment casting of thin-walled aluminum alloy castings with a wall thickness (or local wall thickness) less than 1.5mm, and belongs to the field of investment casting. Background technique [0002] At present, the purpose of precision casting of aluminum alloy parts is to obtain castings with complete dimensions, excellent crystallization of internal structures, and good mechanical properties. According to the existing casting process, after the aluminum alloy is melted, degassed and refined, the aluminum alloy liquid with a temperature of 710-740°C is poured into a mold shell with a temperature of 100-300°C, and then placed in the air Cool and wait for the casting to solidify and form. However, for thin-walled castings with a wall thickness (or partial wall thickness) less than 1.5mm, when precision casting is carried out at a mold shell pouring temperature of 100-300°C, most of the thin-walled parts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D27/04
CPCB22C9/04B22D27/04
Inventor 冉普
Owner GUIZHOU HONGLIN MACHINERY
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