Diesel motor aluminium alloy cylinder metal mould low-pressure casting method

Abstract

The invention relates to a method for metal mold low-pressure casting of an aluminum alloy cylinder body of a diesel engine, which adopts a metal casting die and a low-pressure full metal mold casting method to cast the aluminum alloy cylinder body and comprises the steps of low-pressure pouring, sand vibration, primary processing and heat treatment, wherein in the step of low-pressure pouring, a water jacket and an oil duct are cast by adopting an oil duct sand core and a water jacket core respectively, and a cylinder sleeve is cast in an embedding mode; and the whole cast adopts a mode that the surface of a cylinder barrel is on the upside while the surface of a crankshaft is on the downside, an aluminum liquid is introduced from the cylinder barrel, and the temperature for casting the aluminum liquid is between 670 and 690 DEG C. The method combines the advantages of pressure casting and gravity casting, and adopts a low-pressure casting technique so that a cylinder body cast reaches the requirement of high mechanical property of the diesel engine, and simultaneously ensures high technical production rate, saves energy source, and has simple and convenient casting process.

Description

Technical field: [0001] The invention belongs to the technical field of casting, in particular to a metal mold low-pressure casting method for casting an aluminum alloy cylinder block of a diesel engine. Background technique: [0002] At present, the cylinder block is recognized as a cutting-edge technology in the domestic foundry industry, and the aluminum alloy diesel engine is one of its main representative parts. The complex structure, large wall thickness difference, cast iron cylinder liner and closed water jacket structure lead to This product is still unable to produce cast aluminum cylinder blocks that meet the performance requirements in China, and defects such as pores and shrinkage are very easy to occur during production. Since the cylinder block is one of the key parts of the diesel engine, and the aluminum alloy diesel engine is one of the important symbols of the lightweight of the automobile engine, the quality directly affects the overall performance and se...

AI Technical Summary

Problems solved by technology

However, for the diesel engine cylinder block that needs to be cast into the cylinder liner for closed water cooling, there are problems such as mechanical properties that cannot meet the design requirements, cylinder liner joints that are not dense, leakage, low yield, and many waste sands.

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