SERAMITSUKUJUDENTAIKYOSHINKINOSEIZOHOHO

摘要

PURPOSE:To prevent a resonance element from cracking or chipping when handled after its manufacture by beveling the end surface peripheral edge part of the resonance element in a staircase shape at the time of its formation by compression. CONSTITUTION:A core 5 having a necessary diameter is set in the center in a die 3. A necessary amount of ceramic powder is charged in the die 3, and compressed and compacted by upper and lower punches 4. Consequently, a compacted body which is formed in the staircase shape having two ridge parts 11 and 12 at both external peripheral edge parts A1 and A2 among compression- directional end surfaces while one end surface ridge part 11 is rounded as required and the other ridge part 12 is beveled in the fine-step staircase shape is obtained. Then this compacted body is sintered and caked and barrel machining is carried out to form one ridge part 12 into a necessary R surface simultaneously with deburring.