Micro Precision Technology Co., Ltd.
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          judy.tang@mpt-china.com
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Injection mold design principles generally include the following:
. One-way flow
. Flow Balance
. Constant pressure gradient
. Maximum shear stress
. Weld / Weld marks placed on
. Avoid stranded
. Avoid undercurrent
. Friction heat can be controlled
. Heat flow channel valve
. Acceptable flow channel / cavity ratio
The following is the basic interpretation of the principles of mold design.
A one-way flow of design principles is to ensure that the filling process, the plastic should be in one direction, flow, and keep a straight flow front. This has led to a one-way positioning generation.
Balance the flow of all of the flow path should be balanced and that is, at the same time the same pressure of filling.
Pressure gradient, the most efficient way to fill the pressure gradient (pressure lowering per unit length) along the flow path is a fixed time.
Maximum shear stress the maximum shear stress
Shear stress at the time of filling material should be less than the critical maximum shear stress value depends on the materials and applications.
Welding / fusion place to place in the least sensitive parts of weld and fusion line.
Avoid staying alone could have been avoided in the fluid flow path is divided into thick and thin flow path where the gate setting.
Undercurrent through the gate to avoid the setting to avoid the undercurrent to ensure fluid filled area in the final encounter.
Friction heating for the control of the friction heating design flow, an increase in cavity melt temperature, which will get in the product low stress, rather than not cause the degradation of plastics due to a long period of high temperature plastics.
Heat flow channel valve using thermal valve design flow channel system, ensuring that when the gate to freeze is just filling the cavity has been fully completed and packing it to avoid filling in the mold after the packing or have had back.
Flow Road / cavity ratio of high-pressure drop design of flow channel system that allows flow channel material to obtain a minimum percentage of low-flow channel / cavity design.
In the usual mold design process, the basic design principles should be followed to ensure the rationality of the design mold, and these principles injection molding CAE analysis results of the study provides an analytical basis for