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#098 Fundamentals of Press Die Structure Design (7) Equipment for Preparing Dies and Die Design

Category : Die Design
October21, 2011

The size of the dies becomes apparent when the process design of product machining is completed. In general, dies are planned to be fabricated from a single plate as shown in Fig. 1(a). Although there are no problems if the dimensions A and B shown in Fig. 1(a) are within the machining limits of the machining equipment, if the design is made without paying attention, there will be problems that the dimensions exceed the limits of the machining equipment. In the machining of plates, it is possible to think of the involvement of various types of machines such as milling machines for rough machining, surface grinders for surface machining, milling machines or machining centers for machining holes, and wire discharge cutting machines, etc. Each of these machines has its own maximum working dimensions, or maximum load weight limits. Designing so that the size or weight of the plates constituting the dies are within the limiting ranges of the metal working machines makes it possible to fabricate dies that are easy to fabricate and maintain. If the maximum dimensions of the plate are determined, it is possible to carry out a design considering the position of division in the process design stage, and it becomes possible to fabricate dies that are well balanced as shown in fig. 1(b).

It is also necessary to pay attention to detailed and minute aspects. For example, in the case of a block component, when a groove such as the one shown in Fig. 1(c) is required, if machining using an end mill or a grinder is assumed, it is necessary to decide paying attention to the tools or the grinding wheel, etc. Similarly, there are also situations such as those shown in Fig. 1(d) and Fig. 1(e). In the case of the hole machining in Fig. 1 (d), if an accurate hole is required, the limit for the dimension Z is considered to be three times the dimension d in terms of economy. Awareness of such machining limits requires the knowledge of the economically required accuracy. It is important to machine the components safely.

Fig. 1 Relationship between die design and machining limits of metal working machines

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