| 摘要 |
<p>PROBLEM TO BE SOLVED: To heat it in a short time and uniformly even if its inside surface form changes in the direction of an axis intricately, and moreover it is the socket, of which the wall thickness also changes. SOLUTION: When carrying out powder coating of the socket 3 of a cast iron pipe 2, the heating equipment 1, which is arranged with high frequency induction heating coils 5...5 corresponding to the concave-convex form of the inside surface of the socket 3 in the direction of an axis, are inserted, and the inside surface of the socket is heated by the high frequency induction.</p> |
