| 摘要 |
PROBLEM TO BE SOLVED: To improve the service life of a die and to take the main body of the die separable from a reinforcing case. SOLUTION: Stripe grooves 2 having a prescribed depth are provided along the axial direction of the main body 1 of the die in the places where stress is concentrated in the state of internal pressure on the main body 1 of the die from the side of a die hole 1a and/or the outer peripheral side. The main body 1 of the die is fit into the reinforcing ring 6 by high pressure and also the reinforcing ring 6 is fit into the reinforcing case 3 by high pressure. The reinforcing case 3 is made into a bottomed cylindrical shape, and a communicating hole 4 to the die hole having a diameter slightly larger than a communicating hole to the die hole of a receiving body is provided in the center position of the bottom. The receiving body 5 on which the communicating hole 5a to the die hole whose diameter is equal to the die hole 1a or slightly larger than that of the die hole is provided in the center position is fit to the inside bottom 32 of the reinforcing case 3 so that there is a play.
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