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我机修厂每年要为总厂下属各个石油提炼、化纤、塑料等分厂生产各种不同规格的不锈钢球阀门。由于石油化工对防漏、防爆要求特殊,故对阀门的密封要求严格,制造精度高。球阀体是球阀门中的关键零件。以前,我们采用曲传统加工方法,是使用弹性套定心胀紧芯轴,定心夹紧定位孔。然后,在普通车床上用尾架顶针顶住心轴进行加工。但这种夹具结构较复杂,制造困难、制造周期长、成本高。最近,我们设计制造了“球体锥度定心胀夹具”。用它加工出的球阀体能达到技术要求,工效成倍提高。球体锥度定心胀夹具的结构如附图所示,它是由锥心、锥键(均布三只)、锥座三部分组成。其工作原理是:压紧锥心,锥心的轴向移动使三块锥键作径向
I plant each year for the plant under the various oil refining, chemical fiber, plastics and other branches to produce a variety of different specifications of the stainless steel ball valve. As the petrochemical leak-proof, explosion-proof special requirements, so the valve on the strict requirements of the seal, manufacturing precision. Ball valve body is a key part of the ball valve. In the past, we use traditional song processing methods, is the use of flexible sets of cardiac expansion mandrel mandrel, centering and clamping positioning hole. Then, in the ordinary lathe with tailstock thimble mandrel against the mandrel for processing. However, this fixture structure is more complex, difficult to manufacture, long manufacturing cycle and high cost. Recently, we designed and manufactured “spherical taper centering fixture.” With it processed ball valve body to meet the technical requirements, work efficiency increased exponentially. Ball taper centering expansion fixture structure as shown in the figure, which is composed of cone heart, cone key (uniform three), cone seat three parts. Its working principle is: compression cone, the axial movement of the cone heart so that the three cone keys for radial