A casting process for the injection head of an injection molding machine

Abstract

The invention discloses a casting technology of an injection head of an injection molding machine. The casting technology of the injection head of the injection molding machine is characterized by comprising the following technical steps:1, arranging an ingate of a mold cavity in the thin wall of a casting, adjusting the temperature distribution after casting from an integral casting mold at a part far away from the thick wall, so that not only is the liquid shrinkage at the thick wall reduced, but also cold shut at the thin wall is prevented when low-temperature casting is adopted; 2, arranging a chilling block at the lower end of a relatively thick part of a casting in the mold cavity, accelerating the cooling of the thick wall part, and when an integral injection head is formed, condensing or condensing from bottom to top; and 3, arranging a dead head at the relatively thick part of the casting so as to perform compensation shrinkage on the relatively thick part of the casting and reduce defects. The shrinkage defect of the injection head casting can be reduced effectively and the quality of the injection head casting is improved by adopting the technological improvement.

Description

technical field [0001] The invention relates to a casting process for a nozzle of an injection molding machine. Background technique [0002] The injection head is an important casting on the injection molding machine. It needs to withstand a large oil pressure when working. The injection head is usually a bullet-shaped structure with a small tip and a thick middle. The tail is connected to the barrel of the injection molding machine. However, at present The quality of the nozzles cast by the nozzle casting process is not ideal, and oil leakage is prone to occur. [0003] According to the analysis, the structural characteristics of the injection head castings: a. The wall thickness is uneven, and there are many local hot spots in the middle and tail of the injection head, that is, heat accumulation, which is easy to produce shrinkage defects; b. The cavity mostly adopts a riser-free structure; c. The hot joint is located in the lower part of the mold, which is not conducive...

AI Technical Summary

Problems solved by technology

[0002] The injection head is an important casting on the injection molding machine. It needs to withstand a large oil pressure when working. The injection head is usually a bullet-shaped structure with a small tip and a thick middle. The tail is connected to the barrel of the injection molding machine. However, at present The quality of the nozzle cast by the casting process of the nozzle is not ideal, and oil leakage is prone to occur

[0003] According to the analysis, the structural characteristics of the injection head castings: a. The wall thickness is uneven, and there are many local hot spots in the middle and tail of the injection head, that is, heat accumulation, which is easy to produce shrinkage defects; b. The cavity mostly adopts a riser-free structure; c. The hot joint is located in the lower part of the mold, which is not conducive to taking remedial measures; the above three points determine that the injection head is extremely prone to shrinkage defects. When the defects are serious, the defects can be seen after processing. When the defects are relatively light, the naked eye Difficult to discern, leaks when receiving hydraulic pressure