论文部分内容阅读
近年来,国内机械设计者开始对灰铸铁件提出性能好、重量轻和外观美的要求,促使铸造工作者对高强度薄壁铸铁件进行研制,并已取得良好的进展。缸盖是其中的代表之一。一、关于缸盖的开裂问题缸盖的工作条件常使其在进排气孔间过桥处开裂,从而导致缸盖失效。这是由于选材不当造成的。缸盖的工作条件是热面或燃烧室一面的温度较高,背面或水冷却一面温度较低。这一温度差(△T)在缸盖内所引起的热应力(σ)可由下式决定:
In recent years, domestic mechanical designers have started to put forward the requirements for gray iron castings with good properties, light weight and beautiful appearance, prompting castors to develop high-strength thin-wall cast iron pieces and have made good progress. Cylinder head is one of the representatives. First, on the cylinder head cracking problem Working conditions of the cylinder head often make it across the bridge between the intake and exhaust cracking, leading to failure of the cylinder head. This is due to improper material selection. Cylinder head working conditions are hot side or the combustion chamber side of the higher temperature, back or water cooling side of the lower temperature. The temperature difference (ΔT) in the cylinder head caused by thermal stress (σ) can be determined by the following formula: