Research on Production Method of Information Instrument Parts

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The spring steel sheet that has high spring-back nature, high tensile strength, and low elongation is used to form the pipe. But, it was impossible to form the pipe because of the nature mentioned above. Recently, the demands of the plastic working for the forming of the material that have high strength and low elongation have been increased to reduce the weight of the products. The purpose of grant-in-aid for scientific research is to develop the new forming method for these materials.I tried three forming method. (1) Traditional forming method, (2) Progressive bend and bend back forming method, (3) Less forming stand in (2).The results of each method are as follows; (1) is very difficult because of occurrence of shape defects, and also it was impossible to eliminate the defects. (2)is the new forming method to form the material written above. The pipe formed by this forming method does not cause the shape defect, and also the operation to form the pipe is very easy.The principle of the forming method of (2) is found by the experiment in the tangent bender apparatuses. Namely, even if the spring steel sheet is bent back to the flat sheet after the bending of 90 degree, the flat sheet deforms into the circular shape due to the spring back. (3) is the forming method done by only 4 stations instead of 36 stations in (2).