Research on Production Method of Information Instrument Parts

管材采用回弹率高、抗拉强度高、延伸率低的弹簧板。但是，由于上述性质，形成管道是不可能的。近年来，为了减轻产品的重量，对高强度、低伸长率的材料的成形对塑性加工的要求越来越高。科学研究助学金的目的是为这些材料开发新的成型方法。我尝试了三种成型方法。(1)传统成形方法；(2)逐次弯曲及弯曲背成形方法；(3)成形工位少。每种方法的结果是：(1)由于形状缺陷的出现，很难消除缺陷。(2)是形成上述材料的新的成形方法。通过在切线弯曲机上的实验，找出了(2)成型方法的原理。也就是说，即使弹簧钢板在弯曲90度后弯曲回平板，平板也会由于弹回而变形成圆形。(3)是(2)中只有4个站而不是36个站的成形方法。

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).