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Powder metallurgy gear mold shape design and dimensional stability

May 12, 2019

The powder metallurgy gear molds are used in batch size experiments, and the mold yield is small, and it can be manufactured to a certain extent by wood or resin. However, if the experimental mold is used to obtain data on shrinkage, dimensional stability, and cycle time of the product, a single cavity mold should be used for the experiment and it can be used under production conditions. Molds are typically made of gypsum, copper, aluminum or aluminum-steel alloys, and aluminum-resins are rarely used.

The geometric design of powder metallurgy gear molds often requires consideration of dimensional stability and surface quality when designing. For example, product design and dimensional stability require the use of a female mold (female mold), but the surface requires a higher gloss product, but requires the use of a male mold (protrusion), so that the plastic parts ordering party will consider these two Point so that the product can be produced under optimal conditions. Experience has shown that designs that do not meet actual processing conditions often fail.

The size of the powder metallurgy gear mold is stable, and the dimensional contact between the plastic part and the mold is better than that of the part leaving the mold during the molding process. If the material thickness is required to change in the future due to the material stiffness, it may result in the conversion of the male mold to the female mold. The dimensional tolerance of the plastic part cannot be less than 10% of the shrinkage rate.www.yxhgmould.com