Metal mould casting method of cylinder cover

Abstract

The invention discloses a metal mould casting method of a cylinder cover. The method comprises the following steps: preparing a sand core; putting an aluminum alloy molten ingot in a melting furnace to be melt to a liquid, and obtaining a clean aluminum liquid through an aluminum liquid treatment step; installing a mould on a casting machine, preheating the mould and heating the metal mould to 200-350 DEG C; eliminating rusts and impurities on the forming surface of the mould by a jetting tool, and spraying an anti-sticking aluminum metal cavity coating; putting the sand core in the metal mould and assembling the mould; injecting the aluminum liquid into a metal mould cup; cooling to form a solid state cylinder cover cast within a time T; and opening the mould to take out a cast product, sequentially removing sprue and dead head of the cast, removing the sand cover in the cavity, polishing and finishing and carrying out surface shot blasting treatment to obtain a product cast of the cylinder cover. The cast of the cylinder cover obtained by the method disclosed by the invention is high in tissue density, good in quality and high in yield, so that the defects of easily generating pores, shrinking and insufficiently pouring are effectively avoided.

Description

technical field [0001] The invention relates to the field of metal casting, in particular to a metal mold casting method for a cylinder head. Background technique [0002] The cylinder head is an important part of a car engine, and its outer contour is about 410mmX180mmX130mm. Cylinder head castings have extremely high requirements, such as: smooth appearance, high precision, and clear and complete outline; the internal structure of the casting is dense, without casting defects such as pores and shrinkage; the casting material is aluminum-silicon alloy, and the corresponding tensile strength of the material is ≥ 235Mpa. Extension ≥ 1, and require no leakage under 2bar air pressure and so on. At the same time, since the average wall thickness of the cylinder head casting is in the range of 4-5mm, there are many isolated thick shapes with a wall thickness difference of more than 2 times, and the water jacket core has a large amount of gas, but due to structural limitations, i...

AI Technical Summary

Problems solved by technology

At the same time, since the average wall thickness of the cylinder head casting is in the range of 4-5mm, there are many isolated thick shapes with a wall thickness difference of more than 2 times, and the water jacket core has a large amount of gas, but due to structural limitations, it cannot be effectively exhausted. Gas, so casting is more difficult, prone to defects such as pores, shrinkage porosity and insufficient pouring

Images