Gravity casting process of all-metal mould of coupler aluminum part

Abstract

The invention relates to a gravity casting machining process of an all-metal mould of a hydraulic coupler shell, comprising the following process steps of: (1) mould preheating: placing the cleaned steel mould into a baking oven for warming and preheating, then spraying demoulding paint to the contact surface of a workpiece, heating again to 200-250 DEG C, keeping temperature, and then fixing a lower mould on a demoulding machine; (2) pouring: assembling a mould assembled in a positioning way through an upper mould and the lower mould of the demoulding machine, and then fast pouring previously refined liquid aluminum alloy into a cavity; and (3) demolding: firstly enabling the upper mould to be pass through a transmission device, enabling the upper mould to be firstly separated from the workpiece through an upper mould demoulding ejector plate and an upper mould fixing plate, and then ejecting the workpiece through a demoulding ejector plate and a discharging ejector plate. According to the gravity casting machining process disclosed by the invention, the manufacturing time of a sand core is saved and the cost of sand purchasing and waste sand cleaning is reduced by utilizing a sand casting process of the all-metal mould; in addition, the effect of a low-pressure casting process can be achieved by utilizing the all-metal mould.

Description

Technical field [0001] The invention belongs to a mechanical casting process, in particular to a full metal mold gravity casting process for an aluminum part of a hydraulic coupling. Background technique [0002] In the prior art, the inner mold of the aluminum casing of the turbine, pump wheel and other aluminum parts with blades of the coupling mainly adopts ordinary sand cores, and the outer mold adopts a metal mold casting method. The disadvantages are that the inner mold is cast with a sand core, The requirements for sand molding are high, and the technical requirements for molding workers are high; the second is that the sand core is easy to break, relying on sand core positioning and rapid pouring, the cast product is prone to center asymmetry, uneven blades, uneven blade surfaces and inner cavities. Defects such as smoothness have great resistance to the oil flow circulation of the hydraulic coupling during use and power loss; third, the surface finish of sand core c...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the inner mold of the aluminum casing of the turbine, pump wheel and other aluminum parts with blades of the coupling mainly adopts ordinary sand cores, and the outer mold adopts a metal mold casting method. The disadvantages are that the inner mold is cast with a sand core, The requirements for sand molding are high, and the technical requirements for molding workers are high; the second is that the sand core is easy to break, relying on sand core positioning and rapid pouring, the cast product is prone to center asymmetry, uneven blades, uneven blade surfaces and inner cavities. Defects such as smoothness have great resistance to the oil flow circulation of the hydraulic coupling during use and power loss; third, the surface finish of sand core casting products is not high, the yield rate is low, and the area required for molding is large, and sand casting is completed. Most of them are discarded later, which is neither environmentally friendly nor economical.

[0003] At present, some manufacturers adopt low-pressure casting technology. Low-pressure casting relies on advanced equipment investment, and the investment cost of presses and molds is high. However, there are many varieties and specifications of hydraulic couplings. Each product must make molds according to the requirements of low-pressure casting. It is difficult for enterprises to bear

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