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Design Optimization and Processing Standard of Injection Mold Inserts

Design Optimization and Processing Standard of Injection Mold Inserts

  • 2022-09-01

Design Optimization and Processing Standard of Injection Mold Inserts


With the increasing demand for various types of molds in the market like the Automotive Plastic Injection Molds, the Consumer Electronics Plastic Injection Molds, the mold industry has developed very rapidly in recent years. With the development of the mold industry; with the upgrading of processing equipment, the requirements for the detailed design and processing of injection mold inserts parts will also be more refined. The following are some cases we encounter daily and it is valuable to share. 



Injection Moulded Parts chamfering and clearances requirements:

1. The sharp corners of the non-sealing surface of plastic mold parts and die-casting mold parts should be chamfered, including the countersunk head of screws and the countersunk head of the cooling water holes;

2. For example, here is the tunnel of the core-pulling slider on the mold. The tunnel should have 10mm sealing width, then to have 0.5mm clearance on the remaining space. Otherwise, it will be a waste of time when fitting the mold with the slider insert later. When the contact surface is too large, the parts will be easy to burn during the movement, which affects the service life of the mold.


3. Deep corners on the mold insert should be designed to be a gradient transition fillet. The reason is that because the upper section of the corner is too close to the part position. Due to space limit, the Max. R is 6.5 there. For R6.5, CNC machining can only use a maximum of Φ12 milling cutter. As the corner is 150mm deep, Φ12 milling cutter can only be processed to a depth of 60mm, and the remaining depth will not be able to be processed, which requires an electrode. But if it is a gradient transition fillet, we can have R6.5 for 20mm long upper section, and have 13.5 for the lower section which is 130mm deep. For R13.5, it can be machined with a Φ25 milling cutter, and a CNC Φ25 cutter can be machined to a depth of 170mm. In this way, this corner can be completely CNC machined, no need to make electrodes, this optimization not only saves cost, but also improves machining accuracy.

4. The corner position of the mold will be based on the needs of mold machining proceses, according to the principle of optimizing the mold design and simplifying the machining process to improve the machining accuracy and efficiency. Combined with the characteristics of CNC machining, in the 3D modeling design, the features on the part such as the R size at the corner are determined. The set carries out some standard unification requirements as follows:


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