How to control the accuracy of plastic injection molding parts? Plastic shell or enclosure is generally produced by injection molding process (sometimes finished by two to more process like CNC milling the internal structure). Product size control and manufacturing process are inseparable. In addition and the size of the product itself is also a relationship, the greater the product, the more difficult to control.
The effect of dimensional accuracy is divided into two parts: Injection mold making and injection molding production.
Plastic Injection mold making:
JINGXIN is a plastic injection mold making factory located in Dongguan
In the mold making tool to meet the accuracy requirements, the mold master can produce a mold to meet the design requirements. So the key lies in the mold design.
1.The material of Mold steel
How to choose the right mold steel material depends on the estimated order quantity in the near future. For example, the mold life can be 300k-500k shot if it is made if the high-quality steel like JIS S136 (DIN2136). High-quality mold steel injection mold produce high-quality parts. Another factor is the additional mechanical properties to strengthen the treatment such as hardening. If the mold is made of poor mold steel, the wearing mold could not guarantee the accuracy.
2.The mold gate system design
Plastic injection molding machines are pressure limit, and generally in the high-pressure high-speed, injection molding machine easy to instability. So a reasonable gate system should be easy to fill the mold cavity, the focus is Design and selection of gate system.
3, The part shrinkage rate
Plastic thermal expansion, and contraction during the plastic molding. So the size of plastic products is certainly smaller than the mold size. The mold size should be designed larger than the product size. How much is it? This depends mainly on the shrinkage rate of different kind plastic. According to the experimental data, we have a variety of plastic shrinkage rate. Mold designers can refer to this data to design the mold size. Generally, take the middle value, the basic rules are: thin wall with small rate, thick arms take large rate, near the gate of the small rate. Shrinkage rate to obtain the more accurate, the more easily meet the size requirements of the product.
4. Moldflow analysis
General plastic molds were adopted Moldflow simulation before making the mold. with the simulation it will found the parts deformation after plastic injection molding. Then make some minor adjustment to the mold size in order to get the parts as high quality as possible.
5.Mold accuracy
High-precision machining equipment and testing equipment is to ensure the accuracy of the premise of the mold. Mold master’s operating experience is also very important.
Skilled Mold machinist is also very important Like at JINGXIN injection molding company who have 50+ skilled plastic injection mold machinist. They have done 1000+ plastic injection molds for their clients all over the world, American, Europe.
Injection molding production:
Five elements to ensure that the accuracy of large parts during mass production, the stability of production factors is necessary, but to do is not easy!
Please refer to the tips for What is plastic injection molding?
- People (Workers): A skilled the technical staff who know how to adjust the parameters of the injection machine is very important
- Injection Machine: high-quality injection molding machine controls accuracy and stability;
- Plastic Raw Material: Time to dry, the different supplier of plastic should be taken into consideration.
- Process: the right process is the key point to a production manager and mold designer
- Environment: Dirty free, constant temperature workshop.
jingxin factory supply plastic injection mould service
Mass production is required that five elements to be as stable as possible!
Mold is designed for producing a high-quality plastic part to meet the customer’s demand. The above is just a small part of our comments, actually, plastic injection molding is very complicated, and sometimes we have to treat it case by case! At JINGXIN, we always seek to find the best injection molding solution to meet the requirements.
For further information, visit our pages on the injection molding process and the advantages of injection molding. If you would like to know more about JINGXIN, please go to our Products & Services and Manufacturing or About Us pages.
