生产铸铁直管的常规工艺一般采用潮型卧铸，为防止浇注时砂芯浮起而产生偏厚废品，解决浮芯常用的办法是在型腔内放置２个芯撑，这种方法虽然能避免浮芯，但芯撑处因经不起耐压试验而产生渗漏。最近，我们生产一批直径１５０ｍｍ，长２．５ｍ，承受２．５ＭＰａ的耐高压铸... Conventional production of cast iron straight pipe generally used tide-type casting, in order to prevent the casting core floating when the resulting thick waste, to solve the common method of floating core is placed in the cavity 2 core support, although this method can Avoid floating core, but the core support due to withstand the pressure test leaks. Recently, we produce a series of high pressure die-casting with diameter of 150mm, length of 2.5m and withstand 2.5MPa ...