我厂生产的一种产品中部有一个弹仓,在弹仓的两根上梁和两根下梁上,分布着三十对弹架固定接头。这些接头,通过三级精度的销孔配合和叉耳配合关系,为各种大小不同的弹架组合了二十一个安装位置,尺寸交错,关系复杂,要求是很高的。但是,由于弹仓是大开口的结构形式,受力又很大、很复杂,因而,弹性变形大,变形量的数值也随条件而变化,从而使各接头的相互位置也随承载情况和产品的支承情况而变化。用什么方法定位这些固定接头,才能保证安装弹架时,各接头的相互位置是正确的呢?这是我们在长期生产过程中一直碰到的难题。过去,采用的方法是使弹仓产生使用状态(即安装弹架时弹仓的承载和支载状态)时的 I produced a plant in the middle of a magazine, in the magazine’s two beams and two beams, the distribution of thirty pairs of shells fixed joints. These joints, through the three-precision pin hole with fork and ear cooperation, for a variety of different size of the combination of a total of twenty-one installation positions, staggered size, complex relationships, the requirements are high. However, since the magazine is a large open structure, the force is very large and complicated. Therefore, the elastic deformation is large and the value of the deformation varies with conditions, so that the mutual positions of the joints also vary with the bearing conditions and products The support of the situation changes. How to locate these fixed joints in order to ensure that the mutual positioning of the joints is correct when installing the carrier? This is the problem that we have encountered in the long-term production process. In the past, the method used was to make the magazine produce the service status (that is, the loading and supporting status of the magazine when installing the magazine)