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According to the characteristics of composite materials and the practical experience in the process, the key points of die design for SMC process are summarized. Detailed elaboration is made from ten aspects, and the key points of SMC die design control by die manufacturer are given.
In the design process of SMC die pressing apparatus, the cavity of the die should be designed according to the specific size of the product. In addition, the appropriate materials should be selected according to the surface quality requirements and demand of the products. In order to ensure product quality and process feasibility, the cutting edge and ejection system of the die should be reasonably designed.
Parting surface design
In order to make the product easy to demould, ensure the product precision, strength and facilitate the processing of the die, the following principles should be taken into account in the selection of parting surface: (1) In order to make the product easy to launch and simplify the ejection mechanism, the position of parting surface should keep the product in the lower die as far as possible after opening the die. (2) To minimize the damage to product appearance caused by flying edge, and at the same time, it should be easy to remove the residual flying edge; (3) Easy to manufacture and process die SMC parts; (4) For products with high requirement of radial dimension accuracy, the influence of flying edge thickness on product accuracy should be considered, and the vertical parting surface should be taken to ensure the radial accuracy of products. (5) Guarantee the strength of the product and avoid sharp corners and thin walls.
The design of parting surface is very important. In the early stage of die design, parting design should be carried out to draw parting design drawings to ensure that the product can be demoulded smoothly and easy to produce.
In the design process of SMC die pressing apparatus, the cavity of the die should be designed according to the specific size of the product. In addition, the appropriate materials should be selected according to the surface quality requirements and demand of the products. In order to ensure product quality and process feasibility, the cutting edge and ejection system of the die should be reasonably designed.
Parting surface design
In order to make the product easy to demould, ensure the product precision, strength and facilitate the processing of the die, the following principles should be taken into account in the selection of parting surface: (1) In order to make the product easy to launch and simplify the ejection mechanism, the position of parting surface should keep the product in the lower die as far as possible after opening the die. (2) To minimize the damage to product appearance caused by flying edge, and at the same time, it should be easy to remove the residual flying edge; (3) Easy to manufacture and process die SMC parts; (4) For products with high requirement of radial dimension accuracy, the influence of flying edge thickness on product accuracy should be considered, and the vertical parting surface should be taken to ensure the radial accuracy of products. (5) Guarantee the strength of the product and avoid sharp corners and thin walls.
The design of parting surface is very important. In the early stage of die design, parting design should be carried out to draw parting design drawings to ensure that the product can be demoulded smoothly and easy to produce.
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