What are the causes of mold cartridge heater damage?
1. Power Design
The power of the ordinary mold cartridge heater cannot be too large, and the normal surface load cannot exceed 8w / cm2. The surface load of the imported cartridge heater is 11-12w / cm2. The larger the surface load of this standard mold cartridge heater, the shorter the life
2.Material selection
The mold cartridge heater belongs to the scope, so its working environment and working temperature will choose different materials.
The working temperature is about 100-300 degrees, and the material of the heating pipe is stainless steel 304.
The working temperature is about 400-500 degrees, and stainless steel 321 is optional.
The working temperature is around 600-700 degrees, so stainless steel 310S should be used.
Therefore, the material is not selected correctly, which is also the reason for the short life. Also, whether the mold is vibrating, if it is vibrating, use nichrome wire with better flexibility.
3., the gap with the mold hole
Because air has a hindering effect on heat conduction, if the heat is not emitted, the surface temperature of the heating tube will rise, and the internal temperature of the cartridge heater will also rise. When the internal temperature of the mold cartridge heater is high, it will burn. The bad resistance wire shortens the life of the cartridge heater of the mold, and more serious tube explosion will occur, so the gap between the cartridge heater and the mold cannot be too large. However, the gap between them should not be too small, because the mold cartridge heater will expand due to the principle of thermal expansion and contraction after the power is installed. Many molds cannot be taken out when the cartridge heater is broken.