Metal formed die gravity tilt casting process of aluminum alloy cylinder cover

Abstract

The invention discloses a metal formed die gravity tilt casting process of an aluminum alloy cylinder cover, comprising the following steps of: producing a water jacket cavity, an airway cavity and an oil cavity of the aluminum alloy cylinder cover into a plurality of sand cores according to the decomposition and producing procedures of the sand cores; placing the sand cores into a metal formed die; pressing the sand cores at the dead head; tilting the metal formed die to 90 degrees to ensure that a filtering port of a sprue cup to face upward; pouring aluminum liquid into the filtering port to enter the sprue cup; tilting and returning the metal formed die by the speed control of low speed, high speed and low speed in the tilting process to ensure that the aluminum liquid enters the metal formed die; opening a negative pressure exhausting system to exhaust gas; opening a water-cooling system to cool parts of a combustion chamber on the cylinder cover until a casting is discharged from the die; and cooling the casting to obtain an aluminum alloy cylinder cover casting. The invention can be used for producing the aluminum alloy cylinder cover casting with the advantages of thin wall, complication, high mechanical property, compact surface and bright color and has the characteristics of short production period, low cost of the casting and high production efficiency, yield and qualification rate.

Description

technical field [0001] The invention relates to an aluminum alloy casting technology, in particular to a casting process for an aluminum alloy cylinder head of an automobile engine. Background technique [0002] The structure of the cylinder head of the automobile engine is complex and consists of multi-layer cavities. Leakage is not allowed in each cavity, and its wall thickness is uneven, making casting difficult. At present, the production of engine aluminum alloy cylinder head castings mostly adopts the gravity single-side pouring process designed in Germany. Because the single-side pouring has very high requirements for casting equipment and automation, the mold production cycle is long, the cost is large, and the equipment investment is large; The pouring process also has the defect that the camshaft hole on the cylinder head and the plane of the spring seat are prone to slag inclusion for the cylinder head castings, and an additional wire filter needs to be installed ...

AI Technical Summary

Problems solved by technology

[0002] The structure of the automobile engine cylinder head is complex, consisting of multi-layer cavities, each cavity is not allowed to leak, and its wall thickness is uneven, making casting difficult

At present, the production of engine aluminum alloy cylinder head castings mostly adopts the gravity single-side pouring process designed in Germany. Because the single-side pouring has very high requirements for casting equipment and automation, the mold production cycle is long, the cost is large, and the equipment investment is large; The pouring process still has the defect that the camshaft hole on the cylinder head and the plane of the spring seat are prone to slag inclusions for the cylinder head castings, and an additional wire filter needs to be installed at the front of the runner, which will pollute the recycling of furnace materials

Other cylinder head casting adopts the gravity double-side bottom injection process, which needs to be equipped with ceramic filters, which has the defects of low cylinder head yield, low riser temperature, and easy shrinkage

Therefore, there is no self-designed and applied metal mold gravity tilting pouring process for aluminum alloy cylinder head.

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