| 摘要 |
PURPOSE:To improve the forming threshold by deep drawing, drawing depth and the uniformity in the thickness of a deep drawing product by making the wrinkle pressing force in a deep drawing stage at the value just before the rupture of a thin sheet material in case of deep-drawing various kinds of thin sheet materials by a press machine equipped with a punch and wrinkle presser. CONSTITUTION:In case of deep-drawing, the lightweight clad material of a steel plate - polypropylene - steel plate, etc., a very thin steel plate and the thin plate like blank 5 of a plastic plate, etc., with a die 4 and punch 6, the punching force of a punch 6 is measured by a load cell 7 and inputted into a central information processing unit 12 via an amplifier and A/D convertor. This processing unit 12 compares the rupture load P0 with the punching force P and in case of the set value P0'<P being slightly lower than P0 the wrinkle pressing force is loosened by an outer ram 1 via D/A convertor, amplifier and servo valve 13 and in case of P0'>P reversely the wrinkle pressing force is controlled so as to increase it by an outer ram 1, the deep drawing is performed by a constant punching force over the whole working process, the deep drawing threshold is improved, the working yield of the material is improved and the thickness of a work is uniformized as well.
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