Plastic mold manufacturers, key points of injection mold design

Plastic mold manufacturers, key points of injection mold design

In the design of injection molding machine, stiffener is an important design element. Reasonable application of stiffeners can increase the rigidity of products and reduce deformation. The thickness of the stiffener must be controlled between 0.5 and 0.7 times of the product wall thickness, otherwise it will cause surface shrinkage. In addition, the single-sided inclination of the stiffener should be greater than 1.5 ° to avoid top injury.

Another important design consideration is the mold opening direction and parting line. In the early stage of injection molding product design, it is necessary to determine the mold opening direction and parting line of the product, so as to minimize the use of core pulling slider mechanism and eliminate the influence of parting line on product appearance. After the mold opening direction is determined, the stiffener, buckle, bulge and other structures of the product shall be designed to be consistent with the mold opening direction to avoid core pulling and reduce the seam line, so as to prolong the service life of the mold. In addition, it is also necessary to select an appropriate parting line to improve the appearance and performance of the product.

The hole design also needs attention. The shape of the hole should be as simple as possible, generally taking a circle. The axial direction of the hole should be consistent with the opening direction to avoid the problem of core pulling. When the length diameter ratio of the hole is greater than 2, the demoulding slope shall be set, and the diameter shall be calculated according to the small diameter size. The length diameter ratio of the blind hole is generally not more than 4. In addition, the distance between the hole and the edge of the product should generally be greater than the size of the hole.

The design of fillets also needs careful consideration. Too small fillet may lead to product stress concentration, resulting in product cracking. Similarly, too small fillet may also cause stress concentration in the mold cavity, leading to cavity cracking.

Demoulding slope is another important design factor. Proper demoulding slope can avoid galling. The demoulding slope of smooth surface shall be greater than or equal to 0.5 degrees, that of fine grain surface shall be greater than 1 degree, and that of coarse grain surface shall be greater than 1.5 degrees. Proper demoulding slope can also avoid top damage of the product, such as top white, top deformation, top breakage and other problems.

Injection mold design points, injection mold design needs to consider many factors, including stiffener, mold opening direction, parting line, hole design, fillet treatment and demoulding slope setting. The reasonable application of these design points can improve the product quality and prolong the service life of the mold, so as to realize the high efficiency and stability of production.

In the design of injection molding machine, stiffener is an important design element. Reasonable application of stiffeners can increase the rigidity of products and reduce deformation. The thickness of the stiffener must be controlled between 0.5 and 0.7 times of the product wall thickness, otherwise it will cause surface shrinkage. In addition, the single-sided inclination of the stiffener should be greater than 1.5 ° to avoid top injury.

Injection mold design points, injection mold design needs to consider many factors, including stiffener, mold opening direction, parting line, hole design, fillet treatment and demoulding slope setting. The reasonable application of these design points can improve the product quality and prolong the service life of the mold, so as to realize the high efficiency and stability of production.