What are the characteristics of injection mold parts design process and the most common mistakes
Many parts of the injection mould will affect the properties, dimensions and other properties of the final product.These die parts include: mold cavity shape, gate, parting line, vent, sinker and hinge.Mold designers must take these factors into account.Sometimes in order to get the best design, the product designer, the processor, and the mold designer should discuss together to meet the needs of the product. It usually takes some time to prepare the mold.
(1) prototype mold
As an evaluation of the expected performance of the product, the prototype mold must be designed to have the necessary characteristics for the production mold, such as runner, gate and gate setting, exhaust port and cooling system, etc.The ejector mechanism, the accessory device of the mould, should be carried out in a manner similar to that of the mould even if the prototype design is carried out, but only one or two die cavities are available.
(2) production molds
Clean the mold before the next cycle begins.However, almost all molds are now designed to take out the product automatically and no operator is needed.The better design of ejector and mould lubrication system is no longer necessary for mold spraying. The automatic lubrication system of mould can be connected with the lubrication system of machine.
In any injection mold design process, the designer has a promising goal.In the process of meeting these requirements, there are a series of problems.For example, one of the most common types of errors in mold design occurs in the following aspects: thick/thin section conversion, warping and stress;Multiple gate and stitch;Improper gate setting;Improper setting of die cavity vent;Products too thin, not easy to mold forming, such as diaphragm;Products too thick, not easy to mold forming: melt flow diameter too long, too tortuous: too small flow path;The gate is too small;Improper temperature control;The passage is too long;The product is symmetrical relative to the gate;Orientation of polymer melt along flow direction;Effect of stress removal on fit: movable hinge: slender handle and semi-circular handle;Threaded fitting: creep or fatigue (extremely important) under long-term stress.