Abstract
To attain accurate bending of thin plate springs, spark forming in which a plate is bent by thermal stress due to electric spark is proposed. Experiments are performed with plate springs of 50μm or 70μm thickness made of beryllium copper, pure titanium, pure copper and 18Cr-8Ni stainless steel, and the results are compared with those of laser forming. The bending angle can be controlled with an accuracy of 1×10 −4 degree by the proposed method. It is concluded that spark forming has advantages in the variety of applicable materials, efficiency of energy, cost and space of apparatus over laser forming.
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