Vermicular Iron Cylinder Head Gas Analysis And Overcome The Causes Of Shrinkage Measures

Compacted graphite cast iron as a new cast iron is an ideal material for engine parts, but its production process difficult, long production quality has been unstable since the factory was a serious rejection rate, up to 31.47% when the rejection rate, which still shrinkage defects in the most serious air. In this paper,6M/6L vermicular iron cylinder head for the gas shrinkage defects technology research theme, causes shrinkage in the gas-depth analysis based on the proposed compacted graphite iron cylinder head to overcome the shrinkage gas production process measures to make air the highest rate of shrinkage defects when the waste down 31.47% and 0.69%.The root causes of gas shrinkage is the "gas" and "shrinking" the result of joint action, if the early formation of solidification shrinkage in the "gas" and "shrinking" together, then the formation of shrinkage defects in gas-intensive small cavities. Conversely, if the early formation of solidification shrinkage in the "gas" and "shrinking" together, the formation of large empty gas shrinkage defects. Hot metal production of poor quality, charge is not pure, chemical composition of instability, creep rate of instability, the gating system and exhaust systems are poorly designed and cast section at the Heavy and hot are the result of local overheating produced gas shrinkage factor. Gating system through the adoption of optimal design, optimal design of exhaust systems to enhance purification to improve the quality of hot metal, and strictly control the rate of creep, hot section parts to speed up the cooling rate and other technology measures, and achieved significant results,6M/6L vermicular iron cylinder head basically eliminating the gas shrinkage defects.