| 摘要 |
A pipe piercing mold is provided to hold a pipe firmly, punch the pipe accurately, and preclude a peripheral part of a through hole from being deformed by installing piercing blocks corresponding to the inside of the pipe and holding the pipe, using pressing blocks. A pipe piercing mold comprises upper and lower molds(100,200). The lower mold includes a lower holder, a piercing die(230) whose center is formed with a first piercing hole(237), a piercing block(240) whose one end is connected with a support bar(15) and whose center is formed with a second piercing hole(247), a stripper(250) whose upper center is formed with a punch through hole(252), and a pair of pressing blocks(260) projected by springs(265). The upper mold includes an upper holder(110), a piercing punch(120), and a pair of pushing blocks(140). The piercing die includes a die(231) whose center is formed with a fitting hole(232), and a piecing die bushing(235) having the first piercing hole. Taper parts(262) are arranged at upper edges of the outside of the pressing block. Round parts(142) are arranged at the lower edges in the pushing blocks.
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