4 results about "Flame cutting" patented technology

The invention provides a method for preventing a casting blank from having flame cutting cracks and is applied to crack-sensitive steel types. The method includes the following steps that S1, the casting blank is cut stably and quickly by the aid of a cutting gun; S2, after the cutting gun cuts off the casting blank, the cutting gun is switched off firstly, and then operation is stopped. Accordingto the scheme, the casting blank is cut stably and quickly by the aid of the cutting gun firstly, so that the flame cutting time is shortened, the thickness of the heat-affected zone of the cut partis favorably reduced, crack induction element segregation during recrystallization of the cut fusion zone of the casting blank can also be reduced, and the cutting cracks produced during cutting of the casting blank can be avoided; then the cutting gun is switched off before operation is stopped in the cutting phase, so that the excessive thickness of the partial heat-affected zone of the cut partis favorably avoided, then the cutting cracks produced after cutting of the casting blank are avoided, and the casting blank is effectively prevented from having the flame cutting cracks.

The present invention relates to a continuous casting method for manufacturing a round billet with diameter being more than or equal to Phi 800 mm on a straight continuous casting machine, which includes the following manufacturing process: molten steel from the steel converter is poured into a ladle and rotated to the upper part of a tundish through a ladle turret, molten steel flows into a crystallizer, and covering slag on the surface of the crystallizer mainly comprises the following components by the weight percentages: 26-32 percent of SiO2, 14-18 percent of Al2O3, 24-28 percent of CaO, 16-20 percent of C and 2-4 percent of Li2O. When a billet shell at the outlet at the lower end of the crystallizer has a certain thickness, and a tension leveler and a crystallizer vibration device are turned on, the round billet with a liquid core is slowly pulled out downwards, 4-8 m length round billets are cut through a flame cutting machine, the excised round billets are horizontally positioned and pulled out, the length round billets over 600 DEG C surface temperature are hung to a slow cooling pit for slow-cooling over 24 hours, and the round billets after finishing slow cooling is hung to a shot blasting machine for shot blasting examination of the surface. The continuous casting method can compensate for the large shrinkage generated during casting and solidification and solve the stress problem generated during the cooling process.

The invention discloses a novel semi-automatic flame cutting machine. The novel semi-automatic flame cutting machine comprises a welding bracket, a fire-jet head, a gas delivery pipe, a baffle plate, a baffle plate bracket, a rotary bracket, a fastening lock, an operating rod, horizontal adjusting instruments, a base and a fixed supporting column, wherein the horizontal adjusting instruments are arranged at the corners of the base; the fixed bracket is arranged at the center of the base; the fastening lock is arranged on the outer end surface of the fixed bracket; the rotary bracket is arranged at the upper end of the fixed supporting column; the welding bracket is arranged at the upper end of the fixed supporting column; the fire-jet head is arranged at the lower end of the welding bracket; the upper end of the fire-jet head is connected to the gas delivery pipe; the baffle plate bracket is arranged on the outer end surface of the rotary bracket; the lower end of the baffle plate bracket is connected to the baffle plate; and the operating rod is arranged at the rear end of the rotary bracket. The novel semi-automatic flame cutting machine disclosed by the invention is reasonable in design, good in cutting effect, high in safety performance, long in service life and suitable for being popularized and applied.