Extrusion Die Casting Method for Thin Wall Aluminum Alloy Parts Used in Automobile Engines

Abstract

The invention relates to an extrusion die casting method for a thin-walled aluminum alloy automobile engine pump body cover, and the method is suitable for obtaining the automobile engine pump body cover which is good in airtightness and compactness, high in product percent of pass, complex in shape and structure and thin in wall. The extrusion die casting method includes the steps that a quantitative pouring cup is adopted to convey aluminum alloy liquid from a heat preservation furnace to a die-casting machine cylinder chamber, an extrusion die-casting machine punch pushes the aluminum alloy liquid steadily to a die cavity, and the aluminum alloy liquid pushing process sequentially includes three stages, namely the extrusion die casting speed, the die casting speed of a horizontal die-casting machine and pressure maintaining, shrink compensation and particle compaction, wherein in the first stage, the pushing range accounts for 50-60% the whole range, so that air in a material cylinder escapes, the alloy liquid enters the middle segment of the die cavity at a low speed, air escapes, and air trapping is reduced; in the second stage, the pushing range accounts for 33-43% the whole range, so that press-shoot is conducted rapidly, a product is fully formed in an inflatable mode, and cold shut is solved through rapid formation; in the third stage, a blank casting is obtained.

Description

technical field [0001] The invention relates to the field of casting, in particular to an extrusion die-casting method for thin-walled aluminum alloy parts, in particular to an extrusion die-casting method for automobile engine pump body covers, cylinder heads, cylinder covers and the like. Background technique [0002] In order to save energy and reduce consumption, reduce exhaust emissions, improve driving comfort and vehicle mechanical properties, cars are now developing in the direction of lightweight. From the perspective of structural materials, the main means to achieve vehicle lightweight is to replace traditional materials with lightweight materials with high specific performance (specific strength and specific stiffness). The aluminum alloy material has the characteristics of low price, high specific performance, and outstanding damping and vibration reduction performance. The use of aluminum alloys in automobile structures can reduce vehicle weight and fuel consu...

AI Technical Summary

Problems solved by technology

However, conventional high-pressure die-casting in a cold chamber cannot effectively solve the problems of more air bubbles and lower compactness of the product.

[0005] The use of aluminum alloy extrusion casting to produce the above-mentioned thin-walled aluminum alloy automobile engine pump body cover also has limitations. First, the slow injection speed leads to insufficient filling capacity, and complex castings cannot be well filled; second, the axial (thickness) ) with low dimensional accuracy

That is, the advantage of traditional squeeze casting is that it can effectively solve the airtightness problem of the die casting machine, and can solve the conditions of porosity and shrinkage porosity from the source, but the disadvantage is that the filling capacity is insufficient, and complex parts and thin-walled parts cannot be effectively formed.

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