| 摘要 |
PROBLEM TO BE SOLVED: To prevent the crush of a heating tube at its front end and the mutual contact of adjacent spiral portions of a coil in the heating tube resulting therefrom when supporting the heating tube at its front end formed into a protruded semispherical face and pressing it into a metal body in a metal glow plug manufacturing process. SOLUTION: A press-in device which is used for pressing the heating tube 3 inside the metal body 2 has a front end supporting part 101 for supporting the front end 3a of the heating tube 3 when pressed therein. The front end supporting part 101 is formed into a recessed spherical face 101a into which the protruded semispherical face at the front end 3a of the heating tube 3. The front end 3a of the heating tube 3 is supported by the spherical face 101a of the front end supporting part 101, and the heating tube 3 is pressed into the metal body 2. COPYRIGHT: (C)2007,JPO&INPIT
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