The disassembly and maintenance of the double alloy scr […]
The disassembly and maintenance of the double alloy screw nozzle of the injection molding machine is a problem that many users have been very concerned about. Here we will teach you how to replace and install the screw correctly and effectively. After reading this article, many of your puzzled questions will be solved!
The disassembly of the injection nozzle of the injection molding machine is done after the cleaning of the inner wall of the barrel and the nozzle. First remove the protective cover outside the barrel, the heater outside the nozzle and the hot spot coupling, remove the surface materials and dust and other dirt; hit it with a special hammer to loosen it, and then loosen the connecting bolt with a wrench. When the connection bolt is loosened to 2/3, tap it lightly with a special hammer. At this time, it is not advisable to loosen them completely to prevent the gas in the barrel from spraying and hurting people; after the internal gas is released, the bolts are loosened with snow and then the nozzle is removed.
1. Disassembly of the double alloy screw nozzle of the injection molding machine
If there is residual material in the barrel, it should be heated to the plasticizing temperature first, using polyolefin resin with high thermal stability or special cleaning material for the barrel, and fully perform high-speed cleaning, and try to discharge the remaining molten material before entering the disassembly. Work, because the residual material at the nozzle part is always impossible to be discharged, so the nozzle or barrel head should be heated, and then the nozzle is disassembled. After the injection nozzle of the double-alloy screw of the injection molding machine heats up, tap it with a special hammer to loosen it. It is not appropriate to loosen all the bolts. When it is loose to 2/3, tap lightly. After the internal gas is released, remove the nozzle. The cleaning of the dual alloy screw nozzle of the injection molding machine should be carried out at high temperature while it is hot, so as to remove the residual melt in the flow channel from the nozzle hole. The method is to inject the mold release agent from the nozzle to the inside, that is, to infiltrate the mold release agent from the side of the nozzle thread to the material and the inner wall wall surface, so that the material is separated from the inner wall, thereby removing the material from the nozzle.
Second, the maintenance of injection molding machine double alloy screw nozzle
If there is one-sided contact or poor contact between the nozzle and the mold positioning sleeve during production, the spherical R part of the front end will be deformed, forming a groove for the melt to escape, resulting in flash at the nozzle, and the caliber part will also appear Deformation, so the overflow should be checked and repaired in time.
3. The thread of the nozzle should be checked regularly
Focus on checking the integrity of the part and the sealing surface on the side of the barrel. If serious wear or corrosion is found, it should be replaced in time.
4. Check the internal channel of the double alloy screw nozzle of the injection molding machine
By air injection can observe the surface quality of the molten material strip, and the residual molten material discharged from the nozzle can more accurately reproduce the flow channel condition in the nozzle. This can analyze the residual amount of melt in the nozzle and the temperature distribution.