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我厂的出口产品承压壳体见图1,系砂型铸造而成,材质分两种(ZL-104,ZCuZn16Si4)。由于砂型铸造原因,在壳体的喇叭口侧面上,形成0.3～0.5mm的砂眼、针孔及组织缩松等缺陷,其数量占铸件总数的35～40％,按常规工艺是难以克服点状微孔的存在,有些缺陷往往埋在里面,不经加工是难以看见,这些缺陷除影响外观质量外,个别的铸件在受压(2～3MPa)情况下,还会产生微渗漏现象. 为尽快满足出口产品的外观质量要求,我们选用旋碾压工艺,解决了这一问题,经过近一年的批量生产证明,达到了比较满意的结果,现将此工艺介绍如下: 1.旋碾压的设备及工具要求
I plant the export product pressure housing shown in Figure 1, Department of sand casting, made of two materials (ZL-104, ZCuZn16Si4). Due to the reason of sand casting, flaws of 0.3-0.5mm are formed on the flanks of the shell, defects such as blisters, pinholes and tissue shrinkage are formed, accounting for 35-40% of the total number of castings. According to the conventional process, it is difficult to overcome the defects The existence of micropores, some defects are often buried in it, without processing is difficult to see, in addition to these defects affect the appearance of quality, the individual castings under pressure (2 ~ 3MPa), there will be micro-leakage phenomenon. As soon as possible to meet the appearance of the export product quality requirements, we use the rotary milling process to solve this problem, after nearly a year of mass production proved to be satisfied with the results, the process is introduced as follows: 1. ROLL Equipment and tools required