| 摘要 |
PURPOSE:To inhibit the melting and rising of a coating by gripping a coated wire to a section near a ball forming section by a chuck made of a metal, heating the ball forming section while being heated by the chuck and forming a ball. CONSTITUTION:A section between a capillary 5 and a section, to which a ball 4 is shaped, in a coated wire 1 is gripped by a heat-dissipating chuck 6 made of a metal. The ball 4 is formed by a discharge torch 7 under the state. Consequently, the mutual contacts of wire rods exposed from a coating 3, a wire-short, and contacts with a chip, etc., of the wire rods exposed, an edge-short, are not generated. Accordingly, the melting and rising of the coating 3 are inhibited. |
