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The composite hole means that the geometric structure of the hole is complex and can be viewed as the combination of several simple holes. For example, in order to facilitate the installation and lifting, usually four hook screws are mounted on large plates such as upper die shoe, bottom die shoe, and stripper plate, and the holes for hook screws are combined holes as shown in Fig. 6. Usually on the progressive die, typical components such as pilot pin assemble and lifter pin assemble are employed which are composed by plug screw, spring, cylinder pin, pilot, or lifter. Figure 7 shows one pilot pin assemble and the holes on the correlated plates. The hole on upper die shoe is a composite hole that consists of a through hole and a screw hole.
2.2 Classification according to the relationship between the correlating parts and correlated plates
From the points of relevance, the above-mentioned various holes associate the correlating parts (or function assemble) and the correlated plates. The relationship between the correlating parts and correlated plates can be classified into three categories, which are one to one, one to many, many to many, as shown in Fig. 8.
2.2.1 One to one
It means the one correlating part and the one correlated plate, as shown in Fig. 8a. For example, when the hook screw is mounted on the upper die shoe or the bottom die shoe or the stripper plate as shown in Fig. 6, the hook screw is the correlating part while the upper die shoe or the bottom die shoe or the stripper plate is the correlated part. The hook screw hole is the connector. This kind of relation is simple.
2.2.2 One to many
It means the relation between one correlating part and a group of correlated plates, as shown in Fig. 8b. This kind of relationship exists commonly such as a threaded fastener connected two or three plates and pins located two plates. There are also many such examples in relevant punch and die structures. In Fig. 4, the slot punch is amounted by the supporting plate and screw. The slot punch is the correlating part that associates the punch holding plate, stripper holding plate, and stripper plate and three holes with different fits on the corresponding plate. In Fig. 5, the die is the correlating part that results in three holes, respectively, on die holding plate, die backing plate, and bottom die shoe. The die is amounted on the die holding plate with an interference fit. The diameter of the circular holes on the die backing plate and the bottom die shoe is increasingly larger than the maximum contour size of the scrap in order to let the scrap drop down smoothly.
2.2.3 Many to many
It indicates the relation between a group of correlating parts and several correlated plates, as shown in Fig. 8c. In a set of progressive die, assembles such as guideposts and bushes, the pilot pins, and lifter pins are common components which can be standardized. In Fig. 2, the assemble of guideposts and bushes composed of ten parts associates with the correlated three parts, upper die shoe, stripper backing plate, and bottom die shoe. In Fig. 7, the pilot pin assemble consists of plug screw, spring, cylinder pin, pilot, and adjusting collar. The correlated parts are upper die shoe, punch backing plate, punch holding plate, stripper holding plate, stripper plate, and die holding plate.
2.3 The descriptive model of plate holes and associated parts
From the analysis of the relationship of the correlating parts and the correlated plates, we can see that two conditions must be met in order to achieve the correlated structure design of holes on plates:
1. The size of the hole(s) on the correlated part(s) will be determined by the correlating part(s).
2. When location of the correlating parts ismoved or the size of the correlating parts is edited, so too do the holes on the correlated plates.
Hence, we establish a descriptive model that views the correlating parts as controller. The relationship model of associated holes is defined as follows:
Class associated holes: