There are many manufacturing standards for medical molds. Almost every different product has different standards. Dalian injection molding is generally more in coastal cities. The requirements for medical molds are really very high. The main manufacturing standards are reflected in products. For example, many medical products are equipped with Ruhr joints, which is a manufacturing standard. If the mold factory does not understand this standard, it will be troublesome. There are also national standards for molds with many product sizes, mainly in full-automatic production and multi cavity, without any burrs and flash, The product surface is smooth.
Dalian injection molding
Stiffener
1. The reasonable application of stiffeners can increase the rigidity of products and reduce deformation.
2. The thickness of stiffener must be ≤ (0.5 ~ 0.7) t product wall thickness, otherwise it will cause surface shrinkage.
3. The slope of one side of the stiffener shall be greater than 1.5 ° to avoid top injury.
fillet
1. Too small fillet may cause product stress concentration and product cracking.
2. Too small fillet may cause stress concentration in the mold cavity and lead to cavity cracking.
3. Setting a reasonable fillet can also improve the processing technology of the die. For example, the cavity can be directly milled with R knife to avoid low-efficiency electrical processing.
4. Different fillets may cause the movement of parting line. Different fillets or clear corners should be selected according to the actual situation. What are the basic points of injection mold design and what are the basic points of injection mold design.
Mold opening direction and parting line
At the beginning of each injection molding product design (Shanghai mold design training school), the mold opening direction and parting line shall be determined to ensure that the core pulling slider mechanism and the influence of parting line on the appearance are reduced as much as possible.
1. After the mold opening direction is determined, the stiffener, buckle, protrusion and other structures of the product shall be designed to be consistent with the mold opening direction as far as possible, so as to avoid core pulling, reduce the seam line and prolong the service life of the mold.
2. After the mold opening direction is determined, the appropriate parting line can be selected to avoid reverse buckle in the mold opening direction, so as to improve the appearance and performance. Shanghai mould design training
Demoulding slope
1. Proper demoulding slope can avoid product galling (galling). The demoulding slope of smooth surface shall be ≥ 0.5 degrees, that of fine grain (sand surface) surface shall be greater than 1 degree, and that of coarse grain surface shall be greater than 1.5 degrees.
2. Proper demoulding slope can avoid product top injury, such as top white, top deformation and top breaking, which are the basic requirements of injection mold design.
3. In the design of products with deep cavity structure, the inclination of the outer surface shall be greater than that of the inner surface as far as possible, so as to ensure that the mold core does not deviate during injection molding, obtain uniform product wall thickness and ensure the material strength of the opening of the product.
hole
1. The shape of the hole shall be as simple as possible, generally round.
2. The axial direction of the hole is consistent with the die opening direction, which can avoid core pulling.
3. When the length diameter ratio of the hole is greater than 2, the demoulding slope shall be set. At this time, the diameter of the hole shall be calculated according to the small diameter (maximum solid size).
4. The length diameter ratio of the blind hole is generally not more than 4. Anti hole needle punching and bending
5. The distance between the hole and the edge of the product is generally greater than the hole size.
