Low-pressure precision casting method for magnesium alloy thin-wall shell part
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A thin-walled shell, precision casting technology, applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problem of many casting defects such as oxidation slag inclusion, avoid cold insulation and under-casting defects, and achieve good fluidity. , the effect of improving product quality and yield
Pending Publication Date: 2022-04-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0005] The purpose of the present invention is to provide a low-pressure precision casting method for magnesium alloy thin-walled shell parts to solve the problem of oxidation and slag inclusion of magnesium alloy thin-walled shell parts in view of the shortcomings of existing magnesium alloy thin-walled shell casting casting technology. , cold shut, shrinkage, shrinkage cavity and many casting defects, improve casting metallurgical quality, improve pass rate, process yield, shorten production cycle
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Embodiment 1
[0024] The profile size of a certain magnesium alloy cylindrical thin-walled part prepared in this example is The wall thickness is 3-10mm, and has internal structures such as through holes and pipelines. Concrete preparation process steps are as follows:
[0025] (1) Use UG software to design parts casting drawings, design and manufacture aluminum wax molds according to the parts casting drawings, use medium temperature wax, press wax patterns and runners, weld runners and wax patterns, and weld molds after assembly The team conducts inspection, correction and repair;
[0026] (2) On the surface of the wax model, brush a layer of 320-mesh corundum powder and silica sol mixed paint with a weight ratio of 3:1, and then hang a layer of 100-mesh corundum powder, hang it once and dry it; hang the corundum powder repeatedly 4 layers , the shell was dried for 12 hours, and then steam dewaxed at 160°C and 5 atmospheres, and the shell was baked at 900°C for 5 hours and then cooled ...
Embodiment 2
[0032] (1) Use UG software to design parts casting drawings, design and manufacture aluminum wax molds according to the parts casting drawings, use medium temperature wax, press wax patterns and runners, weld runners and wax patterns, and weld molds after assembly The team conducts inspection, correction and repair;
[0033] (2) On the surface of the wax model, brush a layer of 320-mesh corundum powder and silica sol mixed paint with a weight ratio of 3:1, and then hang a layer of 100-mesh corundum powder, hang it once, dry it, and hang the corundum powder repeatedly 4 layers , the shell was dried for 12 hours, and then steam dewaxed at 160°C and 5 atmospheres, and the shell was baked at 900°C for 5 hours and then cooled with the furnace; drilled on the top of the shell and the corners where gas is easy to accumulate The exhaust hole of the mold shell is rinsed with 5wt.% boric acid aqueous solution, repeated 3 times, and then put into the furnace and dried at 300°C for 3 hou...
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Abstract
The invention discloses a low-pressure precision casting method for a magnesium alloy thin-wall shell part, and belongs to the field of non-ferrous metal part casting methods. According to the method, through wax mold manufacturing, sand hanging and sintering, a mold shell with a high surface quality, high size precision and an internal complex structure is obtained, a magnesium melt is prevented from reacting and oxidizing with the mold shell by internally brushing a coating, and the surface quality is guaranteed; then, a pouring scheme is designed, and key process parameters such as low-pressure casting mold filling time and crystallization pressure are reasonably controlled in combination with a mold shell heat preservation measure, an anti-oxidation measure and a filtering device, so that stable flowing and anti-oxidation of a melt in the rising and mold filling process, in-place mold filling under the pressure condition and feeding in the solidification process are ensured; the internal metallurgical quality of the casting is guaranteed, a complex thin-wall structure is achieved, and meanwhile good surface quality and dimensional accuracy are achieved. By adopting the casting method, not only are the metallurgical quality and the yield of the magnesium alloy casting improved, but also materials are saved, the process yield of the casting is improved, and economic benefits are improved.
Description
technical field [0001] The invention relates to the technical field of casting methods for non-ferrous metal parts, in particular to a low-pressure precision casting method for magnesium alloy thin-walled shell parts. Background technique [0002] Magnesium alloys have the advantages of small specific gravity, high specific strength, high damping, high thermal conductivity, good shock absorption, and easy recycling. Magnesium alloy castings have been widely used in automotive, aerospace, and 3C industries. [0003] Shell castings are an important type of castings used for electric tool casings, mechanical equipment, aerospace engine accessory casings and reducer casings. Shell parts generally have thin wall thickness, complex structure, fast casting cooling speed, difficult mold filling, and casting defects such as cold shut and shrinkage porosity are prone to occur during the casting process. At present, green sand or resin sand mold gravity or anti-gravity low-pressure ca...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04B22C9/04B22C7/02B22C3/00
Inventor 陈荣石闫宏吴军伟刘清侯丹辉韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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