| 摘要 |
PURPOSE: A piercing press is provided to reduce operation noise, simplify fabrication and effectively performing piercing processing on an operation part only by directly positioning a separate hinge cam unit operated with being rolling contacted by upper mold driver on a piercing processing part. CONSTITUTION: In a piercing press comprising an upper mold(1), an upper mold pad(5) for padding the panel by pressing a panel(3) from the upper side with being connected with the upper mold, a lower mold steel(11) which supports the panel from the lower side of the upper mold, on which punch holes(15,17) are formed correspondingly to a processing part of the panel, and which directly supports the panel, and a lower mold(9) into which the lower mold steel is integrated so that a piercing hole is processed on the panel, the piercing press comprises an upper mold driver(12) which is installed at one side of a lower part of the upper mold, on the lower surface of which an inclined sliding surface(13) is formed, and which is connected with vertical operation of the upper mold; and a hinge cam unit(20) comprising a punch slide installed on the lower mold in one side direction of the lower mold steel on the lower mold correspondingly to the upper mold drive so that the punch slide is slidingly driven slantly with being rolling contacted with the inclined sliding surface of the upper mold driver to process a piercing hole on a processing part of the panel on the lower mold steel by a piercing punch(19), wherein the hinge cam unit comprises base plate(21), guide block(25), punch slider(27), first rod(29), second rod(31), rolling means(33), and restitution member(35).
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