Views: 49 Author: Site Editor Publish Time: 2021-06-08 Origin: Site
Plastic has great fluidity, which makes it difficult to produce plastic injection molding parts in strict accordance with the requirements of the drawings, especially for some plastic injection molding parts that require relatively high dimensional accuracy. The dimensional accuracy of custom injection molding parts refers to the obtained The degree of conformity between the size of the plastic part and the size in the product drawing is to obtain the accuracy of the size of the plastic part. Goodtech is a professional china custom plastic injection manufacturer, how can we make injection molded parts with high precision products?
Firstly, there are many factors that affect the dimensional accuracy of plastic injection molding parts. The first is the injection molding tooling manufacturing accuracy and the degree of mold wear, and the second is the fluctuation of plastic shrinkage rate and the change of process conditions during molding.
The aging change of the plastic part after molding and the structure and shape of the injection molding tooling, etc. Therefore, in order to reduce the processing difficulty of injection molding tooling and the manufacturing cost of the mold, under the premise of meeting the requirements of the use of injection molded parts, the dimensional accuracy of the plastic parts should be as good as possible The design is lower.
The dimensional tolerances of plastic injection molding parts can be designed and processed according to SJ1372-78, which is the tolerance value standard of plastic parts. According to this standard, the injection precision of plastic parts is divided into 8 precision grades, of which grades 1 and 2 belong to the technical grade of injection molding processing. , It is only used under special requirements. The standard only specifies the standard tolerance value, and the basic size upper and lower deviations can be allocated according to the matching properties of the plastic parts.
For the dimensions that are greatly affected by the active part of the injection molding tooling, such as the height dimension of the compression part, due to the influence of the thickness of the horizontal profile overflow, the tolerance value is the sum of the tolerance value and the additional value in the table, and the accuracy is level 2 The additional value is 0.05mm, the additional value of 3~5 precision is 0.10mm, and the additional value of 6~8 precision is 0.20mm.
In addition, for uninjected tolerance dimensions, it is recommended to adopt the 8-level accuracy in the standard. Only by strictly following the tolerance value standard of plastic injection parts can the dimensional accuracy and quality of plastic parts be guaranteed.
In order to meet the human pursuit of plastic injection molding processing, the performance of products in various industries is constantly improving. Products are composed of accessories. This requires higher and higher product accessories, which greatly allows product accessories to reach the beginning of design The size of the injection molding industry is the same, and injection molding processing has become a field in which major injection molding companies compete.
Nowadays, many products can't reach the life of their original design. There are many reasons for this. One of the reasons is that the product accessories cannot reach the size of the original design. A complete product consists of several or even more. Composed of tens of thousands of accessories, the size fails to meet the design requirements, causing problems during use, and even if it takes a long time, the accessories are replaced.
For example, every accessory on a spacecraft is manufactured through thousands of selections. Perhaps a small size problem can cause a major accident. Therefore, in recent years, various industries have increased their investment in manufacturing. Whoever can master good manufacturing technology will be able to occupy a dominant position in the future competition.
Goodtech is a group of companies specializing in injection molding tooling and plastic injection molding parts production for many years. The company focuses on providing customers with a complete set of solutions from product design, mold manufacturing, medical molds, injection molding and assembly, and after-sales service. Products are widely used It is used in the fields of housing accessories for household appliances, and injection molding accessories for medical and medical equipment.