Patent ID: 7052648

Claim:
A method for manufacturing a flange for a compressor, the flange having a relief groove around a hollow thereof, the method comprising the steps of: manufacturing an ablative member having a ring shape with a diameter greater than the diameter of the hollow, the ablative member selected from the group consisting of copper (Cu), lead (Pb), zinc (Zn), aluminum (Al), alloys thereof and reinforced plastics (FRP); charging powder material of Fe—Cu—C for the flange into a mold; positioning an ablative member on the upper surface of the charged powder material and around the hollow where a relief groove is to be formed; forming the flange by compressing the powder material and the ablative member; and sintering the formed flange at a temperature between 1,100 degrees C. and 1,300 degrees C. so as to melt and remove the ablative member.