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河北省某阀门厂在生产矩形耐热铸铁阀门时,由于裂纹造成废品占全部阀体能的20％以上,经采取多种工艺措施,如浇注位置的改变、放置冷铁、改善型芯的容让性等均无明显效果,成为生产中急需解决的问题。经本院与厂方合作,最终解决了矩形耐热铸铁阀露的裂纹,在生产中获得了初步成效。一、阀体裂纹缺陷分析矩形耐热铸铁阀体,使用温度500～550℃。阀体最大轮廓尺寸为3130×1845×460(mm),主要壁厚50～80mm。其形貌及铸造缺陷见附图。铸件的化学成份及性能见表1。
Hebei Province, a valve factory in the production of rectangular heat-resistant cast iron valve, due to cracks caused by the waste accounted for more than 20% of the body’s energy, to take a variety of process measures, such as pouring position changes, placing chilled iron, improve core allowance Sex, etc. have no obvious effect, become an urgent need to solve the problem of production. The hospital and the factory cooperation, and ultimately solve the rectangular heat-resistant cast iron valve exposed crack, obtained initial results in the production. First, the body crack defect analysis Rectangular heat-resistant cast iron body, the use of temperature 500 ~ 550 ℃. The largest body size of the valve is 3130 × 1845 × 460 (mm), the main wall thickness 50 ~ 80mm. The shape and casting defects see the attached drawings. The chemical composition and performance of castings are shown in Table 1.