Selection principle of injection mold parting surface

The selection principle of the injection mold parting surface, Shanghai Mulan Injection Mold Processing Factory said that the parting surface should not only be selected according to the shape, size, accuracy and use requirements of the injection molded part, but also according to the molding process characteristics of the injection molded part. It is more necessary to select the injection line according to the structure of the injection mold of the injection molded part. The choice of the parting surface is a contradiction and a unity, it must be selected, and it needs to be based on the injection molded parts. The selection of the parting surface analysis method is a very good way to determine the parting surface.




1. The selection principles and key points of the injection mold parting surface


The selection principle of the parting surface of the injection mold, the selection of the parting surface of the plastic mold plays a very important role in the design of the injection mold, especially for the opening and closing of the injection mold. When selecting parting surfaces for various types of injection molded parts, certain rules must be followed.


(1) Principles for the selection of the parting surface of the injection mold Reasonable determination of the form and position of the parting surface is an important factor that determines the complexity of the injection mold structure and the ease of processing and manufacturing. When determining the parting surface, it is mainly based on the following principles.


① The selection of the parting surface cannot affect the opening and closing of the fixed and moving molds of the injection mold.


②The selected parting surface cannot make there be a gap between the parting surfaces of the fixed and moving molds of the injection mold; otherwise, the overflow of the molten plastic melt under the action of the pressure of the injection machine will injure personnel. In addition, the flash of injection molded parts at the parting surface should not be too large.


③ After the injection mold is opened, the injection molded parts should generally stay in the dynamic mold cavity, because the ejector pin of the ejection mechanism of the injection machine is on the movable template of the machine tool, so that the injection molded parts can be under the action of the ejection mechanism demoulding.


④ The choice of the parting surface should be conducive to the surface processing after the parting of the fixed and moving models.


⑤It is conducive to the reasonable arrangement of the pouring system, cold material hole and exhaust groove. within the cavity.


⑥In order to ensure the dimensional accuracy of injection molded parts, the parts with high dimensional accuracy requirements should be located on the same side of the injection mold as possible.


⑦ The injection machine should be prevented from bearing critical load, that is, the injection molded parts should be prevented from approaching the rated projected area.





(2) Key points for selecting the parting surface of the injection mold Generally, there will be flash-like lines at the parting surface of the injection molded part. Therefore, the key points for selecting the parting surface of the injection mold.


①The parting surface should be avoided to be set on the smooth surface of the injection molded part;


②The parting surface should be set at a position without 'obstacles';


③The parting surface should be set at a position that is easy to finish;


④ The position and shape of the gate should be considered.


2. Analysis of parting surface selection of injection molded parts


The selection principle of the parting surface of the injection mold, Shanghai Mulan Injection Mold Processing Factory said that when designing the injection molding mold, the first thing is to analyze the form and position of the parting surface, and find out the selection points that can make the injection mold divide the injection molded parts. Profile analysis.