| 摘要 |
<p>A method of producing a self-locking tong adapted to clutch preferably round and hexagonal bodies, the jaws of the tong interacting with the body at three places, essentially separated 120° from each other. Moreover, the tong comprises a revolving jaw section (2) having two jaw surfaces forming an angle with each other of mainly 60°, the jaw section being pivotally fixed to a handle jaw section (1) carrying a third jaw surface adapted to perform the third interacting point with the body. As blank material a steel plate capable of being hardened is used, e.g. a boron alloy steel plate analyzing: C 0.2 to 0.25, Cr 0.5 to 1.5, Mn 0.8 to 1.5, B 0.002 to 0.003. The handle section (1) or the jaw section (2) or both are produced by laser cutting, and the jaw surfaces are casehardened in a depth of mainly 0.1 to 0.15 mm followed by hardening and tempering to achieve a resulting hardness of the size of 60 to 62 Rc.</p> |
