最近我厂承制某研究所的20台加注器,材质为1Cr18Ni9Ti,封头和壳体厚度均为3mm,上下二个椭圆形封头和壳体焊接而成,设计压力为10kgf/cm~2,水压试验为15kgf/cm~2,气密性试验为10kgf/cm~2。以前我厂压制这种较薄的椭圆形封头时,为了防止成形后表面有凹凸和绉折,采取如下措施:(1)板厚增加到4～5mm;(2)二次成 Recently, I plant a research institute of 20 injectors, made of 1Cr18Ni9Ti, head and shell thickness are 3mm, upper and lower two oval head and shell welded together, the design pressure of 10kgf / cm ~ 2, water pressure test is 15kgf / cm ~ 2, air tightness test is 10kgf / cm ~ 2. In the past I plant to suppress such a thin oval head, in order to prevent the forming surface after the bump and crepe, take the following measures: (1) plate thickness increased to 4 ~ 5mm; (2)