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CPC3型叉车的液压阀体铸件,原为HT30—54铸铁。由于壁较厚,机械加工后,经常发现铸件的结晶组织疏松,铸件废品率很高。灰铸铁的液压阀体,加压到950～1000kg/cm~2时,就开裂渗漏。改用蠕虫状石墨铸铁阀体,加压到1100～1400kg/cm~2时,消除了结晶组织疏松,大大降低了铸件的废品率。一、阀体铸造工艺蠕虫状石墨铸铁的铸造工艺与普通灰铸铁基本相同,工艺方法与装备不需改变。只是前者收缩稍大,需适当加大冒口尺寸,且铁水在
CPC3 forklift hydraulic valve castings, formerly HT30-54 cast iron. Due to the thick wall, after machining, it is often found that the crystal structure of the castings is loose and the casting reject rate is very high. Gray cast iron hydraulic valve body, pressurized to 950 ~ 1000kg / cm ~ 2, cracking cracks. Switch to worm-shaped graphite cast iron body, pressurized to 1100 ~ 1400kg / cm ~ 2, eliminating the loose crystal structure, greatly reducing the rejection rate of castings. First, the body casting process Worm-like graphite cast iron casting process is basically the same with ordinary gray cast iron, process methods and equipment need not be changed. Only slightly larger contraction of the former, need to increase the riser size, and hot metal in