1. According to the type, specification and material of the conical head, the whole plate or panel can be formed by cold stamping, hot stamping, cold spinning, hot spinning, cold rolling, hot rolling, etc. After that, it is welded into a conical head.

　　2. The atmosphere of the furnace of the conical head heating furnace should be neutral or weakly oxidizing, and the heated flame should not be directly contact with the workpiece.

　　3. When the aluminum conical head is hot formed, the heating temperature should generally not exceed 420℃. When the workpiece temperature drops below 300℃, it is not advisable to continue thermoforming.

　　4. The titanium conical head should be hot formed as much as possible. For example, the forming temperature is lower than 300℃, and hot forming should be used as much as possible after cold forming.

　　The hot forming of the titanium conical head is divided into low temperature hot forming (work heating temperature of about 300℃ ~ 400℃) and high temperature hot forming (work heating temperature can be increased to about 650℃, but should not exceed 800℃). The hot correction temperature after cold forming can be from 100℃ to 350℃.

　　5. Stainless steel, copper conical head, nickel and nickel alloy conical heads should be heated by electric heating furnace or hot gas furnace or oil burner, but should not be heated by coke or coal heating furnace.

　　6. For hot-formed nickel and nickel alloy conical heads, the sulfur content in the gas should be less than 0.57g/m³when heated in a gas furnace; when used in an oil-fired furnace, the sulfur content in the fuel should be less than 0.5%. All sulphur-containing oil, oil painting, pencil marks, lubricants, etc. on the workpiece should be removed before heating.