There are many types of gates for Automotive mold, but no matter what form of the gate is used, its position has a great influence on the molding performance and molding quality of plastic parts. Therefore, a reasonable selection of the gate location of Automotive mold is an important design link to improve the quality of plastic parts. When selecting the location of the mold gate, the flow state, filling conditions, and exhaust conditions of the molten plastic in the mold should be analyzed according to the geometric characteristics and technical requirements of plastic manufacturing. The gate for the Automotive mold should be located at the thickest part of the plastic part. When the wall thickness of the plastic part differs greatly if the mold gate is opened in the thinner part, this is the plastic melt entering the mold cavity, which not only has flow resistance, but is also easy to cool, which affects the flow distance of the melt, and it is difficult to guarantee Filling of the entire mold cavity. The wall thickness of the plastic part is often the place where the melt has solidified recently. If the gate is opened in a thinner wall, the wall thickness will not be filled due to the shrinkage of the plastic melt, and surface depressions or shrinkage holes will be formed.
The size and position of the gate of the Automotive mold should be chosen to avoid injection and peristalsis. If the gate of a small mold directly faces a cavity with large width and thickness, when the high-speed material flows through the gate, due to the large shear stress, melt fracture phenomena such as injection and creep will occur. Sometimes the jet phenomenon will also cause the plastic parts to form ripple flow marks.
The gate position of the Automotive mold should be selected so that the flow of plastic is the shortest and the direction of change of the material flow is the smallest.
The position of the gate of the Automotive mold should be conducive to the discharge of gas in the mold cavity.
The material flow should be prevented from squeezing the cavity, core, and insert from deformation.
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