| 摘要 |
PURPOSE:To obtain a joined part of good appearance free from cracking without using brazing filler metal by joining the inner face of the hole of a hinge plate and outer face of the collar of a hinge shaft by caulking leaving a narrow gap between them and quenching and tempering the whole by heating. CONSTITUTION:A hinge shaft 10 before quenching and tempering is of hardenable quality and a hinge plate 11 has no hardenability. The plate 11 has a fitting piece 13 and an inserting hole 14 having conical inner face at intermediate position, and the shaft 10 has a collar 15 slightly smaller in diameter than the hole 14 and having conical outer face similar to the hole 14. This shaft 10 is passed through the hole 14 and the collar 15 is caulked at proper position 17 to leave narrow gap of several tens of mu between the outer face of the collar and inner face of the hole 14. Under this condition, this is quenched and tempered in a vacuum heating furnace etc. Then, diffusion is caused in the gap and the gap is filled with a diffused layer, and the shaft 10 and plate 11 are joined in a body. |
