Low-pressure technology for casting Al-Cu alloy part with metal mould
A technology of low-pressure casting and aluminum-copper alloy, which is applied in the field of metal-type low-pressure casting to produce aluminum-copper alloy castings. It can solve the problems affecting the development and application of aluminum-copper alloys, difficulty in using iron mold sand cores, and low fluidity of molten metal. Problems, to achieve the effect of improving the working environment, improving material utilization, and good mechanical properties
Inactive Publication Date: 2004-10-20
赵强
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Problems solved by technology
However, due to the poor casting performance of this alloy, the fluidity of the molten metal is low, it is difficult to fill the mold, the casting shrinkage is large, and casting defects such as thermal cracking and shrinkage porosity are prone to occur.
For a long time, the sand gravity casting process has been used to produce castings with relatively simple shapes, but there are many insurmountable problems in the production of metallic low-pressure casting process, which seriously affects the development and application of aluminum-copper alloys.
Metal mold low-pressure casting is a common special casting process, which is suitable for the production of aluminum-silicon alloy castings with good casting performance. However, iron mold cores are mostly used, and iron mold sand cores are not easy to use
As for aluminum-copper alloy castings with poor casting performance, few people use iron mold sand cores. Even if metal molds are used to produce castings, only castings with relatively simple shapes are produced. Castings with complex shapes and structures must use sand cores. Production
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[0016] The process of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments: the present invention is a metal-type low-pressure casting aluminum-copper alloy casting process. First, the aluminum alloy material is melted → the furnace body is closed → the mold is prepared, and the process is carried out as follows:
[0017] A. Preheating and installing the mold: preheat the mold first, the preheating temperature is 300-600 degrees, and the holding time is 1-5 hours; install the preheated mold on the low-pressure casting machine;
[0018] B. Preparation of composite core: According to the different parts of the casting 1 with thinner walls, the corresponding parts of the core are prepared differently. In the thicker part of the casting wall, the core is made of metal chilled iron 2, sand core 4 and bonding layer 3. A composite casting core that can only be made of sand cores in the thinner part of th...
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Abstract
A metal-type low-pressure casting process for casting Al-Cu alloy product includes resmelting, sealing furnace, preparing mould, preheating mould, preparing combined mould core, locking mould, low-pressure pouring, high-pressure feeding, holding pressure, shaping, releasing gas, crystallizing solidifcation, opening moulding and cleaning. The casting has features of high compactness and mechanical performance and high size precision.
Description
technical field [0001] The invention relates to a casting process, which is particularly suitable for the casting process of producing aluminum-copper alloy castings by metal mold low-pressure casting. Background technique [0002] The aluminum-copper alloy with a copper content of 4.5-5.3% is the material with the highest comprehensive performance among cast aluminum alloy materials, and its tensile strength can reach 330N / mm after heat treatment 2 Above, the elongation rate can reach more than 4%, the hardness can reach more than HB90, and the specific gravity is about 2.8, which is a kind of engineering material with high strength. Commonly used casting alloy grades are ZL201, ZL201A, ZL204, ZL204A, ZL205A, etc. However, due to the poor casting performance of this alloy, the fluidity of the molten metal is low, it is difficult to fill the mold, the casting shrinkage is large, and casting defects such as thermal cracking and shrinkage porosity are prone to occur. For a l...
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IPC IPC(8): B22C9/06B22D18/04B22D21/04
Inventor 赵强
Owner 赵强