Injection molding is a manufacturing process widely used for producing items from toys and plastic trinkets to automotive body panels, water bottles, and cell phone cases. A liquid plastic is forced into a mold and cures - it sounds simple, but is a complex process. The liquids used vary from hot glass to a variety of plastics - thermosetting and thermoplastic.
Precision Injection Mould is used for high precision and low surface roughness parts. Due to the development of injection industry, injection parts be more and more widely used in precision instruments, electronic instrumentation and other industries, and constantly to replace. Many traditional metal parts has higher and higher requirements for its accuracy. And those accuracy requirements is difficult to achieved by common injection molding method is. Therefore the Precision Injection Mould comes out, and is rapidly developed and improved.
The concept of precision injection moulding is mainly different from conventional injection moulding. It is based on the rapid development of polymer materials. In the field of instrumentation and electronics, precision plastic parts are used instead of high precision metal parts.
At present, there are two defining indexes for precision injection products, one is the repeat precision of product size, the other is the repeat precision of product quality.
Precision plastic products produced by precision molding companies include DVD digital compact disc, DVD laser head, digital camera parts, computer connectors, light guide plate, aspheric lens, and other precision products. The remarkable characteristics of these products are not only high dimensional accuracy requirements but also high internal quality and product rate requirements.
1. Mold design has high precision
No matter what kind of plastic injection molding method is carried out in the mold, the quality of the mold will directly affect the quality of the plastic product. When designing the injection mold, in order to ensure its design accuracy, four aspects should be paid attention to: 1)Mold The accuracy of the accessories must match the precision requirements of the plastic products; 2)When injection molding, pay attention to the size of the movable mold and the fixed mold to make them fit perfectly; 3)The rigidity of the injection mold must meet the needs and reduce the elastic deformation; 4)Ensure that the displacement of the motion module is accurate and in place during injection molding.
2. Avoid product shrinkage caused by poor design
In the process of precision injection molding of plastic products, the design of mold structure and temperature control settings is also part of the precision injection design. If there is a problem in this part of the design, it is likely to affect the shrinkage rate of the plastic product and lead to deviations in the accuracy of the finished product. Therefore, four points need to be achieved: 1)To ensure that the flow rate of the raw materials during injection molding is relatively uniform; 2)To arrange the mold cavities reasonably to maintain the thermal stability of the mold; 3)Try to make the temperature of each mold cavity can be controlled To independent adjustment; 4)Try to install a water cooling system for the punch and the die separately.
3. Avoid mold release deformation during mold use
Under normal circumstances, the plastic products produced by precision injection molding are not very large, and the outer walls are mostly thin. Some of the plastic products also have a certain number of micro structures, so it is easy to have demoulding deformation during injection molding, which leads to a great discount in the accuracy of plastic products and affects the normal use of plastic products. Therefore, we should pay attention to three aspects: 1)While ensuring the rigidity of the mold, we should ensure that the mold has a suitable demoulding structure; 2)Try to use the special push plate for demoulding; 3)Master the appropriate demoulding angle.
4. Precision injection mold design and processing
Precision injection molding is a complex and delicate process, and its mold design requirements are relatively high. At present, it is common to program the mold design through advanced computer technology to complete the processing of precision injection molds. The computer software mainly used in this process, such as pro/ENGINEER. While ensuring the quality of mold design and processing technology, to greatly reduce production costs and improve the production efficiency is the goal we always pursue.
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