B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
113/74
B21D 26/00 (2006.01) B21J 9/20 (2006.01) B30B 15/16 (2006.01) B30B 15/22 (2006.01) F15B 11/032 (2006.01) F15B 11/072 (2006.01)
Patent
CA 1056224
ABSTRACT OF THE DISCLOSURE The present invention provides a method for the shock pressure shaping of blanks to form finished products by using a shock pressure shaping tool, wherein the upper portion of said tool is placed upon the blank by hydraulic means under a tool closing pressure, upon having travelled through a tool closing stroke or path, to thereby hold down the blank until the shock pressure shaping process is initiated, characterized in that the level of the tool closing pressure is adapted to be controlled, and that during the subsequent shock pressure shaping operation, the shaping or deforming process is influenced through a variable degree of elasticity of the shock pressure force by means of a pneumatic-hydraulic auxiliary pressure unit. The invention also includes an apparatus for effecting the above method which comprises a shock pressing apparatus for carrying out the method according to claim 1, comprising one or more hydraulic pneumatic- hydraulic energy sources, one or more liquid/gas accumulators adapted to be charged or pressurized, a hydraulic tool closing device and a hydraulic power cylinder, characterized by an auxiliary pressure unit including a confined space containing a volume of gas which is adapted to be compressed by the hydraulic liquid of said tool closing device, wherein said liquid space of said auxiliary pressure unit is constantly in hydraulic communica- tion with the space or volume of the power liquid of said power cylinder during the working cycles of said shock pressing apparatus.
278994
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