• 2023-11-13
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The complex structure and function design of injection mold

The structure and function design of injection mold is the core part of mold design. Complex products require a complex mold structure to achieve its shape and function, and the function of the mold directly affects the production efficiency and quality of the product.

This paper will introduce how to design complex die structures, such as lateral parting mechanism, inclined guide column core pulling mechanism, double ejector mechanism, etc. At the same time, the design of heating and cooling system, pouring system and exhaust system of the mold will also be discussed. These contents will help you master how to design a mold structure that meets the needs of production.

First, the design of complex mold structure

Lateral parting mechanism: The lateral parting mechanism is a mechanism to realize the lateral opening of the mold, which can help the mold to smoothly release from the core when the mold is released. The design of the lateral parting mechanism should take into account the overall structure of the mold and the size of the demoulding force, and select the appropriate lateral parting surface and locking mechanism to ensure the smooth demoulding and no damage to the product.

Oblique guide column core-pulling mechanism: The oblique guide column core-pulling mechanism is a mechanism to achieve lateral core-pulling of the mold, which can pull out the side core along a certain inclination Angle when opening the mold. The design of the core pulling mechanism of the inclined guide column should take into account the space structure of the mold and the distance of the core pulling, choose the appropriate Angle and length of the inclined guide column, and ensure the accuracy and wear resistance of the slide and core.

Two ejection mechanism: The two ejection mechanism is a mechanism that pushes the product out of a certain distance after the mold ejection, which can conveniently take out the product and automatically pack it. The design of the secondary ejector mechanism should take into account the shape and size of the product, select the appropriate ejector rod and ejector plate, and ensure the stability and durability of the ejector mechanism.

Two, mold function design

Heating and cooling system: The heating and cooling system is a key part of the injection mold. The heating system is used to heat the mold to the right temperature to speed up the melting and filling process of the plastic; The cooling system is used to cool the mold to speed up the curing speed of the plastic and reduce the molding cycle. When designing the heating and cooling system, it is necessary to consider the structure of the mold and the thermal conductivity of the material, and select the appropriate heating elements and cooling channels.

Pouring system: The pouring system is the channel connecting the injection machine to the mold, which introduces the plastic melt into the mold cavity. The design of the pouring system should take into account the fluidity of the plastic, filling time, exhaust and other factors to ensure that the plastic melt can evenly fill the cavity and avoid defects. The design of the pouring system also involves the size, shape and position of the flow path, which will directly affect the filling process of the plastic melt and the quality of the product.

Exhaust system: The exhaust system is to help the mold exhaust impurities such as gas and water vapor during the injection process to avoid defects such as pores and bubbles. The design of the exhaust system should take into account the structure of the mold and the permeability of the material, and select the appropriate exhaust position and exhaust mode, such as opening the exhaust tank or using the exhaust plug.

In short, the advanced content of injection mold design needs to consider the design of complex structure and function. By mastering the design methods and functional design principles of various complex structures, designers can further improve the level of mold design and cope with various challenges in actual production.