Detailed explanation of injection mold production process

       1. Process analysis of plastic products.

       Before the mold design, the designer should fully analyze and study whether the plastic product meets the principle of injection molding processing, and it is necessary to carefully negotiate with the product designer to reach a consensus. This includes necessary discussions on the product's geometry, dimensional accuracy, and appearance requirements to avoid unnecessary complications in mold manufacturing.

       Second, the mold structure design.

       A high-quality mold requires not only good processing equipment and skilled mold manufacturing workers, but also a very important factor is a good mold design, especially for complex molds, the quality of the mold design accounts for 80% of the mold quality %the above. An excellent mold design is: on the premise of meeting customer requirements, making processing costs low, processing difficult, and processing time short.

       3. Determine the mold materials and select standard parts.

       In the selection of mold materials, in addition to the accuracy and quality of the product, the correct choice should be given in combination with the actual capabilities of the mold factory's processing and heat treatment. In addition, in order to shorten the manufacturing cycle, the existing standard parts are used as much as possible.

       Fourth, parts processing and mold assembly.

       In addition to giving the best structure and reasonable tolerances when designing the mold, part processing and mold assembly are critical. Therefore, the choice of processing accuracy and processing methods occupies an absolute dominant position in mold manufacturing. The dimensional error of the molded product is mainly composed of the following parts:

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

       2.The error caused by mold wear is about 1/6

       3.The error caused by uneven shrinkage of the molded part is about 1/3

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

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

       Therefore, in order to reduce mold manufacturing errors, the machining accuracy should be improved first. With the use of CNC machine tools, this problem has been well controlled. In addition, in order to prevent the errors caused by mold wear and deformation, when the processing precision is high and the product output is large, the key parts such as cavity and core should be quenched. In medium and large molds, in order to save materials and facilitate processing and heat treatment, the mosaic design should be used as much as possible in the mold design. In order to solve the errors caused by the uneven shrinkage of the molded parts and the inconsistency between the planned shrinkage and the actual shrinkage, generally, one-third of the product tolerance is selected when the mold is manufactured. Large adjustment room to resolve errors caused by the molding process.

       Five, test mode.

       A set of molds is from the beginning of design to the completion of assembly, but only completes its entire manufacturing process.

       70% ~ 80%. For the error caused by the inconsistency between the planned shrinkage and the actual shrinkage, the smoothness of the demolding, and the cooling effect, especially the problems of the size, position, and shape of the gate on the accuracy and appearance of the product, it must be tested by the test mold. Therefore, the test mold is an indispensable step to check whether the mold is qualified and select the best molding process.