Method for making a hole in a plate and a punch for making such

Metal deforming – With cutting – By shearing tool-couple

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Details

B21D 2814, B21D 2826

Patent

active

059438975

ABSTRACT:
The present invention relates to a method for making an oil passing hole in a plate where the plate is first provided with a pre-formed hole having a first diameter. A punch having a guiding part with a diameter smaller than the first diameter is inserted into the pre-formed hole. The punch also includes pressing part which is larger than the first diameter. The pressing part engages the plate as the guiding part extends into the pre-formed hole. Force applied by the pressing part causes portions of the plate to deform resulting in plastic flow of the portions of the plate. The plastic flow is in a radially inward direction causing portions of the plate to surround and engage the guiding part forming the oil passing hole which has a second diameter that is smaller than the first diameter.

REFERENCES:
patent: 2377558 (1945-06-01), Johnson
patent: 3434327 (1969-03-01), Speakman
patent: 3741141 (1973-06-01), Diekhoff
patent: 4248075 (1981-02-01), Whitley

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