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图1、2为YA 32-500四柱万能液压机上的导向套、导套,材质均为HT200,技术要求为不得有气孔、砂眼、渣眼等铸造缺陷,主要工作面的表面粗糙度要求较低。这两个铸件形状相似,均为导套类。开始,根据这两个铸件的技术要求和具有形状相似的特点,我们都采用干型、顶注、环形顶冒口的铸造工艺,浇注温度为1310～1330℃,但效果却大不相同。导套废品率仅为4.5％,而导向套废品率却达57％。
Figure 1,2 for the YA 32-500 four-cylinder universal hydraulic machine guide sleeve, guide sleeve, the material is HT200, the technical requirements for no holes, trachoma, slag and other casting defects, the main surface of the lower surface roughness requirements . The two castings are similar in shape and are all bushings. At the beginning, according to the technical requirements of these two castings and the similar shape, we adopted the casting process of dry type, top-injection type and ring-shaped top riser. The pouring temperature is 1310 ~ 1330 ℃, but the effect is very different. Guide sleeve rejection rate of only 4.5%, while the guide sleeve rejection rate is up to 57%.