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Dongguan Jinchen Precision Mold Co., Ltd. is a manufacturer specializing in high-precision mold parts processing and technology research and development. It has more than ten years of production experience and has solved many supply and technical problems for customers.

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Five characteristics of injection molds

  1. The cavity and core are three-dimensional

The external and internal shapes of plastic parts are directly formed by the cavity and core. The processing of these complex three-dimensional profiles is relatively difficult, especially the processing of the blind hole inner molding surface of the cavity. If traditional processing methods are used, not only It requires workers with high technical level, many auxiliary tools, fixtures, and tools, and the processing cycle is long.

  1. High precision and surface quality requirements, and long service life requirements

At present, the dimensional accuracy requirements of general plastic parts are IT6-7 and the surface roughness Ra0.2-0.1μm. The corresponding dimensional accuracy requirements of injection mold parts are IT5-6 and the surface roughness Ra0.1μm or less. For example, the roughness of the recording surface of the laser disk must reach the mirror processing level of 0.02-0.01 μm, which requires the surface roughness of the mold to be less than 0.01 μm.

Long life injection molds are necessary to improve efficiency and reduce costs. At present, the service life of injection molds is generally required to be more than 1 million times. Precision injection molds need to use a mold base with high stiffness, increase the thickness of the template, and add support columns or tapered positioning elements to prevent the mold from deforming under pressure. Sometimes, the internal pressure can reach 100MPa.

The ejection device is an important factor affecting the deformation and dimensional accuracy of the product. Therefore, the best ejection point should be selected to ensure uniform demoulding everywhere. High-precision injection molds mostly use inlaid or fully assembled structures in structure, which requires the processing accuracy and interchangeability of mold parts to be greatly improved.

  1. The process is long and the manufacturing time is tight.

For injection molded parts, most of them are matched with other parts to form a complete product, and in many cases, other parts have been completed, and the injection molded parts are eagerly awaiting the launch of the supporting parts. Therefore, the shape or dimensional accuracy of the product is very high. In addition, due to the different characteristics of the resin materials, repeated mold trials and corrections are required after the mold is manufactured, which makes the development and delivery time very tight.

  1. Off-site design and off-site manufacturing

Mold manufacturing is not the final goal, but the user proposes the final product design, and the mold manufacturer designs and manufactures the mold according to the user’s requirements. Moreover, in most cases, the injection production of the products is also done by other manufacturers. In this way, product design, mold design and manufacturing, and product molding and production are carried out in different places.

  1. Professional division of labor and dynamic combination

Mold production batches are small and generally belong to single-piece production. However, molds require a lot of standard parts, ranging from mold bases to ejector pins. These cannot and cannot be completed by only one manufacturer alone, and the manufacturing process is complex. Common equipment and The use of CNC equipment is extremely uneven.


Greetings! I’m Chris, deeply fascinated by mechanical parts and engineering. Let’s embark on a journey through design, functionality, and innovation in the hardware world.

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