一种新型发动机,从试制到转入批生产,往往要经过两至五年或更长的时间。这除了管理上的原因外,工夹具的设计、制造进度和质量是影响试制进度的主要原因之一。从我们厂几种型号的发动机试制中所使用的夹具来看(见图1),“选用夹具”占试制中所有夹具总数的比例是比较大的。这是因为新老型号各机种间大多数零件具有继承性,而不同类别的发动机的同类零件,也有很大的相似性,其主要结构及加工中所选用的定位基准基本相同。因此,这类零组件可选用现有夹 A new type of engine, from trial to turn into batch production, often takes two to five years or more. This except for management reasons, the fixture design, manufacturing progress and quality is one of the main reasons affecting the progress of the trial. Judging from the fixtures used in trial production of several engine models in our factory (see Figure 1), the proportion of “select fixtures” to the total number of fixtures in the trial is relatively large. This is because most of the new and old models have the inheritance of most parts of the various models, and different types of engines of similar parts, there is a great similarity, the main structure and machining used in the positioning of the same basic reference. Therefore, such components can use the existing folder