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福乐系列压缩机是我厂引进美国的专利产品,属回转式滑片压缩机系列.图1是该系列产品中C608型压缩机的气缸铸件.该铸件结构上的主要特点之一是水道坭芯的展面积大、厚度小而且在长度方向上只有数个尺寸小的水道孔和环状芯头连接(如图2).整个坭芯浸泡在高温铁水中很容易成为高温蓄热体.由于树脂砂工艺导热性能差而热容量小,更加剧了这种蓄热效应,导致HT300材质生产时气缸的硬度严重不足.改用MT300CrMo材质,又极易出现渗漏缺陷.据悉,在渗漏问题上,美国人采用的是负压堵漏工艺.我们认为,气缸渗漏说明气缸已存在疏松类缺陷,就会对气缸的质量产生损害.这方面的问题也曾一度困惑过我厂的铸造工作者.
Fu Lok series compressor is our factory to introduce the United States patented product, is a rotary vane compressor series. Figure 1 is the series of C608-type compressor cylinder casting. The casting structure of the main features of one of the waterway 坭The core has a large exhibition area, a small thickness, and only a few small waterway holes and a ring core in the longitudinal direction (as shown in Fig. 2). The entire core is easily soaked in a high-temperature molten iron to be a high-temperature regenerator. Resin sand technology poor thermal conductivity and heat capacity is small, more exacerbated by this heat storage effect, resulting in the production of HT300 serious shortage of cylinder hardness.Used MT300CrMo material, but also prone to seepage defects.It is reported that the leakage problems, Americans use the negative pressure plugging process.We believe that the cylinder leakage shows that the existence of loose cylinder defects, it will damage the quality of the cylinder in this area has also been a problem confused my foundry workers.