Research on Simplification of Opposed Dies Shearing Process Utilizing Differential Pressure

概要

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Opposed dies shearing process proposed by one of the authors is based on the idea of smooth sheared surface formation utilizing a cutting mechanism and has excellent features not found in other shearing processes. This process involves two stages; after sufficient shearing between die and protruding die, a product part is separated successively by a knock-out punch, where knock-out timing is important to prevent fracture of the surface and burr formation. Therefore, this process requires use of a precise hydraulic press which facilitates this complicated action and exact knock-out timing. This requirement seems to prevent wide practical application of this process. Therefore, we propose a simplification of Opposed dies shearing process utilizing differential pressure. First, this idea was tested using a coil spring substituted for hydraulic pressure and its feasibility was confirmed. Secondly, a differential pressure mechanism was realized with a hydraulic press and straight shearing of mild steel was achieved. Basic phenomena of this method were studied and it was found that knock-out timing was controllable by varying the pressure difference. Furthermore, a die set unit utilizing this mechanism was developed and disk blanking of aluminium with a mechanical press was demonstrated.
社団法人日本機械学会の論文
1996-06-15