Patent ID: 9618311
Date: 2017-04-11
CPC Classifications: B21D,B30B,C21D,F42B,F42D

Claim:
1. A method for blasting an object to be treated, including: preparing a pressure vessel that comprises a metal having elasto-plasticity, has a shape allowing the object to be treated to be contained in a closed state, and has an inner circumferential surface to receive detonation energy generated when the object to be treated is blasted in a contained state; giving an initial load to the pressure vessel to the extent that the sum of a primary stress and a secondary stress generated in the pressure vessel exceeds an elastic limit and reaches a plastic region at least at a part of a structural part excluding a local structural discontinuous part of the pressure vessel and generating a shakedown state to the pressure vessel by containing an explosive, sealing the pressure vessel, and detonating the explosive to give the initial load; and blasting the object to be treated in the pressure vessel by containing the object to be treated and a treatment explosive in the pressure vessel after the initial load is given, sealing the pressure vessel, and detonating the treatment explosive.