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Feasibility Analysis Method of Appearance and Defect Factors of Injection Molded Parts
1. Contents of appearance elements of injection molded parts
Appearance element analysis method: Shanghai Mulan Injection Molding Factory aims at various forms of appearance elements on injection molded parts, and formulates an analysis method for mold structure schemes that adapt to the aesthetic appearance of injection molded parts. The appearance elements of injection molding processing of injection molded parts refer to the traces of mold structure molding and molding processing on the surface of injection molded parts. trace. Of course, traces of defects are not allowed to exist.
(1) The method of removing the traces of the parting surface on the injection molded parts removes the traces of the parting surface on the injection molded parts. It is mainly used in cylindrical injection molded parts and injection molded parts with unobstructed sides. It should be avoided as much as possible to affect the appearance of the injection molded parts. Partitioning on the surface. The influence of appearance factors on the selection of parting surface on injection molded parts.
(2) The method of reducing or concealing the traces of the gate When the injection molded parts are molded and processed, it is impossible for the injection mold to have no gate, otherwise the plastic melt cannot fill the cavity of the mold. However, it is possible to change the position of the mold gate, such as making the gate on the back of the injection molded part, so as not to affect the aesthetics of the outer surface of the injection molded part.
① Changing the gate position: the gate set on the sensitive surface of the injection molded part can be changed to a hidden position.
Example: Use the secondary gate to change the position of the gate on the injection molded part. The three gates all use the latent secondary gate of the auxiliary runner, effectively setting the gate on the back or side of the injection molded part. The melt flows into the mold cavity through the submerged gate and arc-shaped or inclined or straight-through auxiliary runners. The secondary gate is mainly designed on the rectangular push rod. After the mold is opened, the condensate in the auxiliary runner and gate is ejected by the push rod together with the injection molded part. The separation of injection molded parts from auxiliary runners and gate condensate can be peeled off manually.
Example: Injection molded parts have the requirement of aesthetic appearance. Although the traces of point gates are small, there are still traces after all. To this end, the point gate can be placed on the inner surface of the injection molded part. When the parting surface is opened, the shape of the injection molded part is opened. When the injection molded part is demolded, the push plate pushes the injection molded part down under the action of the push plate. At the same time, the gate condensate is also pulled off. Then the runner plate is opened by the differential ejector mechanism, that is, when the parting surface is opened, the moving mold core is separated from the sprue core. Under the action of the push rod in the push plate, the condensate in the runner can be pushed out. It should be noted that the opening distance of the runner plate should enable the condensate in the gating system to fall off automatically. Due to the long length of the runner, the sprue sleeve of the extended hot runner equipped with the electric heating ring of the runner plate can be used.
② Change the form of the gate: In the form of the gate of the mold, the position of the auxiliary gate and the latent gate is very flexible. It should avoid setting the gate on the sensitive surface of the injection molded part, and set the gate On the more concealed surfaces of injection molded parts. In order to ensure the aesthetic appearance of the injection molded parts, the form of the gate can also be changed,
③ Feasibility analysis method of injection molding appearance and defect elements of injection molded parts, measures for demoulding marks on injection molded parts: When Shanghai Mulan Injection Molding Processing Factory analyzes the molding marks of mold structure on injection molded parts, sometimes it cannot find the traces on injection molded parts. Existing demoulding traces of the push rod. It is not that the injection mold does not have a demoulding mechanism, but a mold structure that does not leave traces of demoulding on the injection molded part is adopted. Measures for demoulding marks on injection molded parts.
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