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Factors affecting precision injection molding|rapid cnc services|Mastars

Release date:01 , Jan , 0001 Source:Mastars Pageviews:-
Mastars can customize plastic products according to customer sample drawings. We focus on the mold design team to develop and customize precision plastics for machinery, electrical appliances, medical treatment, vehicles, pipelines, engineering and other fields. we provide rapid cnc services,rapid cnc machining,rapid prototyping services.

Mastars can customize plastic products according to customer sample drawings. We focus on the mold design team to develop and customize precision plastics for machinery, electrical appliances, medical treatment, vehicles, pipelines, engineering and other fields. we provide rapid cnc servicesrapid cnc machiningrapid prototyping services.

injection molding

Precision injection molding will be affected by many related factors and environmental conditions, and the most basic factors are plastic materials, injection molds, injection technology and injection equipment. In the early stage of designing plastic products, the engineering plastics that can be needed should be selected according to their environment. Secondly, the appropriate injection molding machine is selected according to the selected plastic materials, the dimensional accuracy of the finished product, the weight of the finished product, the quality requirements and the expected mold structure.


Among the related factors affecting precision injection molding, the mold is the key to obtain precision plastic products that meet the quality requirements. Mold design, mold design is reasonable or not will directly affect the quality of plastic products.

Because the mold cavity size is obtained from the required size of plastic products plus the shrinkage rate of the materials used, and the shrinkage rate is often a value within a range recommended by the plastic manufacturer or the engineering plastics manual. It is not only related to the gate form, gate position and distribution of the mold, but also related to the crystal orientation of engineering plastics, the shape of plastic products, the distance and position from the size to the gate.

The main factors affecting the shrinkage of plastics include thermal shrinkage, phase change shrinkage, orientation shrinkage, compression shrinkage and elastic recovery, which are related to the molding conditions or operating conditions of precision injection molded products.

Therefore, the designer of the mold must have rich experience in design and injection molding, and must consider the relationship between these influencing factors and injection conditions and their apparent factors, such as injection pressure, mold cavity pressure and filling speed, injection melt temperature and mold temperature, mold structure and gate form and distribution, gate cross-sectional area, product wall thickness, content of reinforcing filler in plastic materials The crystallinity and orientation of plastic materials.

The influence of the above factors is also different due to the different plastic materials, or other molding conditions such as temperature, humidity, continuous crystallization, and the change of the injection molding machine after molding.

Because the injection molding process is the process of transforming plastic from solid to liquid and then to solid. Under the combined action of these fields, different plastics (thermosetting or thermoplastic, crystalline or non crystalline, reinforced or non reinforced, etc.) have different polymer structure morphology and rheological properties.

In this way, the intrinsic relationship between process factors and polymer properties, structural morphology and plastic products will be shown through plastic products. The analysis of these internal relations is of great significance to the rational formulation of injection molding process, the rational design and manufacture of molds according to drawings, and even the rational selection of injection molding equipment.

Precision injection molding is also different from ordinary injection molding in injection pressure and injection rate. Precision injection molding often uses high-pressure or ultra-high pressure injection and high-speed injection to obtain small molding shrinkage.


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