Numerical simulation of corner in advance detonating forming for crystallizer square tube

In order to solve the apophysis which is shaped for the reason that the corner of copper tube is squeezed by straight flange and not fitting close for the corner forming of copper tube lagging the straight flange fitting when explosive forming process of square continuous casting crystallizer copper tube is done under water,a new method of explosive forming underwater with the explosive of corner in advance detonating was presented and different detonating designs were analyzed by finite element simulation method.The results show that the corner apophysis of crystallizer square copper tube can be eliminated when the explosive of corner is detonated 10,15 and 20μs earlier,which is consistent with the results of the actual experiment whose explosive in the corner is detonated 20μs earlier.Meanwhile,the impact of mould corner under the action of explosive load can be significantly reduced,which is beneficial to improve the service life,and help lower down the cost in the actual production.Based on fatigue life prediction theory,the scheme of detonating 10μs earlier has the best effect,whose fatigue life is 19 times as long as synchronous-detonating method.The proposed method of explosive forming underwater with the explosive of corner in advance blasting provides a new processing technology for square continuous casting crystallizer copper tube.