Caulking closure method of the resin product using the welding tip and the welding tip for caulking barrette resin product

摘要

PROBLEM TO BE SOLVED: To provide a welding chip and a caulking method where caulking strength is not deteriorated by forming a void with infiltrating a gas body into a welded thick wall part.;SOLUTION: A cooling pin 16 is formed at the center of the welded surface 2 of the welding chip 1, and a cooling recessed part 17 is formed on the back surface 2a of the welded surface 2. The gas body g with which a bottom space 11b of a hollow hole 11a of the welded boss 11 is filled is allowed to blow off to the welded surface 2 side through the clearance 19 made in the skin layer 18 by forming the skin layer 18 on the resin surface quickly contacting to the cooling pin 16 at the melting time to prevent the void 15 from being formed with infiltrating the gas body g into the welded thick wall part 14. Productivity is improved along with improvement in welding strength by caulking using the welding chip 1 forming a narrowed step 21 on the inner peripheral surface 3a of the peripheral side wall 3.;COPYRIGHT: (C)2008,JPO&INPIT