我车间成批生产中型铣床铸铁件,由于生产的迅速发展,出现了制芯能力不足。一九七○年底,在车间党总支的领导下,成立了以老工人为主体的三结合技术革新小组,开始研究制芯新工艺。最初我们试验用呋喃树脂砂热芯盒射芯,收到了一些效果。但由于机床铸件厚大,而呋喃树脂砂的高温强度差、发气量大,易造成铸件的冲砂、粘砂、气孔等缺陷。而且,树脂供应紧张,制芯劳动条件欠佳。能否用别 I workshop mass production of medium-sized milling machine castings, due to the rapid development of production, there has been lack of core capacity. By the end of 1970, under the leadership of the party branch chief of the workshop, a three-pronged technical innovation group with old workers as the main body was established and started to study the new process of core making. Initially we experimented with a core of furan resin sand hot core shot, received some results. However, due to machine tool castings thick, and furan resin sand high temperature strength is poor, a large amount of gas, easy to cause casting sand, sticky sand, porosity and other defects. Moreover, the tight supply of resin, core poor working conditions. Can use other