TAILIEUCHUNG - DFM_Handbookvdg

c | 5 Design for High-Speed Automatic Assembly and Robot Assembly INTRODUCTION Although design for assembly is an important consideration for manually assembled products and can reap enormous benefits it is vital when a product is to be assembled automatically. The simple example shown in Fig. illustrates this. The slightly asymmetrical threaded stud would not present significant problems in manual handling and insertion whereas for automatic handling an expensive vision system would be needed to recognize its orientation. If the part were made symmetrical automatic handling would be simple. For economic automatic assembly therefore careful consideration of product structure and component part design is essential. In fact it can be said that one of the advantages of introducing automation in the assembly of a product is that it forces a reconsideration of its design thus offering not only the benefits of automation but also those of improved product design. Not surprisingly the savings resulting from product redesign often outweigh those resulting from automation. The example of the part in Fig. illustrates a further point. The principal problems in applying automation usually involve the automatic handling of the parts rather than their insertion into the assembly. To quote an individual experienced in the subject of automatic assembly if a part can be handled automatically then it can usually be assembled automatically. This means that when we consider design for automation we will be paying close attention to the design of the parts for ease of automatic feeding and orienting. 191 Marcel Dekker Inc. 270 Madison Avenue New York New York 10016 192 Chapter 5 asymmetrical - symmetrical - difficult to orient easy to orient FIG. Design change to simplify automatic feeding and orienting. In considering manual assembly we were concerned with prediction of the time taken to accomplish the various tasks such as grasp orient insert and fasten. From a knowledge

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