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Five teps of Injection Mold Manufacturing

2022-07-09 Hits: 6 views

1、 Process analysis of plastic products


Before the mold design, the designer should fully analyze and study whether its plastic products conform to the processing principle of injection molding, and need to carefully negotiate with the product designer to reach a consensus. It includes the necessary discussion on the geometric shape, dimensional accuracy and appearance requirements of products, so as to avoid unnecessary complexity in mold manufacturing. Mold works display


2、 Mold structure design


A set of high-quality molds requires not only good processing equipment and skilled mold manufacturing workers, but also good mold design. Especially for complex molds, the quality of mold design accounts for more than 80% of the mold quality. An excellent mold design is to make the processing cost low, the processing difficulty small and the processing time short on the premise of meeting the requirements of customers.


3、 Determine mold materials and select standard parts


In the selection of mold materials, we should not only consider the accuracy and quality of products, but also give correct choices in combination with the actual processing and heat treatment capabilities of the mold factory. In addition, in order to shorten the manufacturing cycle, the existing standard parts should be used as much as possible.


4、 Part processing and mold assembly


In addition to giving the best structure and reasonable tolerance in the design, the accuracy of the mold, part processing and mold assembly are of great importance. Therefore, the choice of machining accuracy and machining method plays an absolutely dominant role in mold manufacturing.


The dimensional error of formed products is mainly composed of the following parts:


  1. The manufacturing error of the mold is about 1/3


  1. The error caused by die wear is about 1/6


  1. The error caused by uneven shrinkage of formed parts is about 1/3


  1. The error caused by the inconsistency between the scheduled shrinkage and the actual shrinkage is about 1/6


Total error = (1) + (2) + (3) + (4)



Therefore, in order to reduce the mold manufacturing error, we should first improve the machining accuracy. With the use of CNC machine tools, this problem has been well controlled. In addition, in order to prevent the errors caused by die wear and deformation, when processing the die with high accuracy and large product output, its cavity, core and other key parts should be quenched.


In order to save materials and facilitate processing and heat treatment, the mosaic structure should be used as much as possible in the design of medium and large molds.


5、 Trial mold


From design to assembly, a set of molds only completes 70% – 80% of the whole manufacturing process. For the error caused by the inconsistency between the scheduled shrinkage and the actual shrinkage, whether the demoulding is smooth or not, and how the cooling effect is, especially the influence of the size, position and shape of the gate on the accuracy and appearance of the product, it must be tested through the mold test.


Mold trial is an indispensable step to check whether the mold is qualified and select the best molding process. MINGYU MOLD is professional injection mould manufacturer, is a good choice.

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