Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method

Abstract

The invention relates to vermicular graphite cast iron with a high rate of vermiculation of a combustion motor cylinder body and a cylinder cover and a preparation method, and belongs to the field of casting method. The vermicular graphite cast iron with the high rate of the vermiculation of the combustion motor cylinder body and the cylinder cover and the preparation method are characterized in that the vermicular graphite cast iron with the high rate of the vermiculation comprises the following chemical components: 3.4%-3.7% of carbon, 2.0%-2.5% of silicon, 0.5%-0.8% of manganese, 0%-0.08% of phosphorus and 0%-0.04% of sulphur, with the balance being iron. In a microscopic structure, a pearlite area accounts for 50%-70%, a ferrite area accounts for 30%-50%. The mechanical properties are as follows: strength of extension sigma b is more than or equal to 320 MPa to 400 MPa, ductility delta is 1%-4%, and hardness HB is 160-230. Due to the fact that molten iron component is near an eutectic point, scope of crystallization is narrow, liquidity is good, casting performance is good, the tendency of a casting shrinkage cavity and shrinkage porosity is little, a wholesome cylinder cover cast and wholesome cylinder body cast are easy to obtain, the service lives of the cylinder cover and the cylinder body are prolonged, certainly, the vermicular graphite cast iron with the high rate of the vermiculation of the combustion motor cylinder body and the cylinder cover and the preparation method play a pivotal role of the performance of improving the combustion motor and prolonging the service life of the combustion motor.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More

AI Technical Summary

Benefits of technology

This patented technology allows for making very fine-grained vermiculum type carburide steel without losing their ability to conduct electric current effectively due to poor heat transfer between them during operation. By increasing the speed at which magnetic particles move through liquid metal droplets on an oil bath containing water, this process can increase efficiency while reducing energy consumption compared to conventional methods such as smelting vermiform graphite into crude copper powder. Additionally, by controlling certain parameters like temperature and pressure within specific ranges, these materials have unique characteristics that make them ideal candidates for use in various applications where they were previously used only once before being replaced. Overall, this new material provides technical benefits over existing ways of producing vermicular graphsite cast irons.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the durability of grey cast irons for engine components like valve guides or piston rings caused from heat stress cracking during operation. While there may be other ways to improve these properties without affecting their overall performance, no single method can achieve all goals simultaneously at once.

Images