understanding the key points of plastic mold design can make good products
the various tools and products used in our daily production and life, ranging from the base of the machine tool and the body shell, as small as a embryo head screw, button and the shell of various household appliances, are all closely related to the mold. the shape of the mold determines the appearance of these products, and the processing quality and precision of the mold also determines the quality of these products. because of the different materials, appearance, specifications and uses of various products, molds are divided into non-plastic molds such as casting molds, forging molds, die-casting molds, and stamping molds, as well as plastic molds.
in recent years, with the rapid development of the plastics industry and the continuous improvement of the strength and precision of general and engineering plastics, the application range of plastic products is also expanding, such as: household appliances, instrumentation, construction equipment, automobile industry, japan in many fields such as 2022卡塔尔世界杯正赛 , the proportion of plastic products is increasing rapidly. a reasonably designed plastic part can often replace multiple traditional metal parts. the trend of plasticization of industrial products and daily-use products is on the rise.
a good plastic mold and plastic products must be carefully designed in this respect, because good design determines good development, so that sales can increase. then what aspects should enterprises pay attention to when designing plastic molds?
① it should be easy to load, which is conducive to the flow of materials to fill the cavity.
②the draft angle should be more than 1°.
③it is advisable to choose the large projection surface of the plastic part as the forming and pressing direction to facilitate the filling of the cavity with materials, but it is not suitable to use the parts with high dimensional accuracy and the vertical direction of the insert and the core axis as the forming and pressing direction.
④the material has a strong penetration force, which makes it difficult to remove the thick flash. when selecting the parting surface, pay attention to the direction of the flash. the upper and lower molds and parallel inserts of the plastic mold accessories should have an integral structure, and the assembly gap of the combined structure should not be large. the upper and lower molds should be detachable and molded parts should have 3 to 4 levels of sliding fit.
⑤the shrinkage rate is 0-0.3%, generally 0.1-0.2%, and the material volume is generally 2 to 3 times the volume of the plastic part.
⑥the molding pressure is large, and the material seepage force is large. the mold core insert should have sufficient strength to prevent deformation, displacement and damage. especially when the gap between the elongated core and the cavity is small.
⑦the mold should be polished and hardened.
⑧ the ejection force is large, the ejector rod should have sufficient strength, and the ejection should be uniform. the ejector rod should not be used as a core.
⑨the rapid molding material can be demoulded at the molding temperature, and the slow molding|plastic mold should be equipped with heating and forced cooling measures.
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