A kind of automobile cylinder head processing technology

Abstract

The present invention relates to a processing technology of automobile cylinder head, comprising the following steps: a, melting, b, refining, c, slag removal, d, die casting, e, finishing, f, finishing, g, heat treatment, h, shot peening treatment , the present invention uses refining agent and strong slagging agent to treat the alloy liquid, so that the performance of the alloy liquid is more stable, and the die-casting effect is better. During the die-casting, the vacuum treatment is carried out first to remove the gas in the cavity, reduce the bubble rate, and reduce the cavity In order to reduce the internal counter pressure, alloys with lower specific pressure and poor casting performance can be used to realize small machines to press large castings. After die-casting, local secondary pressure treatment is carried out to improve the local strength of castings, improve the air tightness of castings and Reduce shrinkage cavity, increase hardness and refine structure and improve plating performance.

Description

technical field [0001] The invention relates to the field of auto parts processing, in particular to an automobile cylinder head processing technology. Background technique [0002] In the prior art, the cylinder heads of automobiles are mainly made of cast iron, which has a relatively high weight and poor mechanical properties. The use of aluminum alloy cylinder heads can greatly reduce its weight, improve mechanical properties, and reduce fuel consumption, but aluminum The alloy die-casting manufacturing process is relatively complicated. The die-casting process has serious congenital deficiencies since its birth. The gas in the cavity has an impact on the casting. Shrinkage cavities and shrinkage porosity are prone to occur in parts of the casting that are relatively thick. It is also a high-pressure aluminum alloy. The current die-casting is basically one-time die-casting, but the wall thickness of many products is difficult to be uniform due to the structural requiremen...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the cylinder heads of automobiles are mainly made of cast iron, which has a relatively high weight and poor mechanical properties. The use of aluminum alloy cylinder heads can greatly reduce its weight, improve mechanical properties, and reduce fuel consumption, but aluminum The alloy die-casting manufacturing process is relatively complicated. The die-casting process has serious congenital deficiencies since its birth. The gas in the cavity has an impact on the casting. Shrinkage cavities and shrinkage porosity are prone to occur in parts of the casting that are relatively thick. It is also a high-pressure aluminum alloy. The current die-casting is basically one-time die-casting, but the wall thickness of many products is difficult to be uniform due to the structural requirements, and there are higher requirements for some parts of the product, which cannot be realized by the existing die-casting process. , Most of the traditional die-casting is passive exhaust, there are many pores inside the casting, and the mechanical properties and quality of the casting are poor, the hardness and fine structure are not good, the back pressure of the cavity is large, and the requirements for the alloy are also low. Higher, it is easy to affect the performance of the cylinder head and cause defects