Green Vitality Industry Co., Ltd.
Green Vitality Industry Co., Ltd.

Preparation before injection mold design

(1) Design task book;

(2) Familiarize with the plastic, including its geometry, the requirements for use of the plastic, and the raw material of the plastic;

(3) Check the formability of the plastic;

(4) Clearly identify the model and specifications of the injection molding machine.

Develop the injection mold molding process card

(1) General overview of the product, such as schematic diagrams, weight, wall thickness, projection area, outer dimensions, presence of side cavities and inserts;

(2) General overview of the plastic used in the product, such as product name, model, manufacturer, color, and drying condition;

(3) The main technical parameters of the selected injection molding machine, such as the relevant dimensions between the injection molding machine and the installed mold, the screw type, and power; 

(4) Injection molding machine pressure and stroke;

(5) Injection molding conditions, such as temperature, pressure, speed, and clamping force.

Steps in injection mold structural design

(1) Determine the number of cavities. Conditions: maximum injection volume, clamping force, product accuracy requirements, economy;

(2) Select the parting line. The principle should be simple mold structure, easy parting, and no adverse effect on the appearance and use of the plastic product;

(3) Determine the arrangement scheme of the cavities. The balanced arrangement should be adopted as much as possible;

(4) Determine the gating system, including the main runner, the sub-runner, the gate, the cold slug well, etc.;

(5) Determine the mold release method. Different mold release methods should be designed according to the different parts of the plastic product that are left in the mold;

(6) Determine the structure of the temperature adjustment system. The temperature adjustment system is mainly determined by the type of plastic;

(7) When the concave mold or the core adopts a block structure, it is necessary to clearly divide the block and simultaneously determine the machinability and installation and fixation method of the block;

(8) Determine the exhaust form. Generally, the exhaust can be accommodated in the gap between the mold parting line and the ejection mechanism. However, for large and high-speed injection molds, corresponding exhaust forms must be designed;

(9) Determine the main dimensions of the injection mold. According to the corresponding formula, calculate the working dimensions of the molded parts, determine the side wall thickness of the mold cavity, the bottom plate of the cavity, the pad plate of the core, the thickness of the moving template, the thickness of the cavity plate of the block-type cavity, and the closing height of the injection mold;

(10) Select the standard mold frame. According to the main dimensions of the designed and calculated injection mold, select the standard mold frame of the injection mold, and try to choose standard mold components;

(11) Draw the structural sketch of the injection mold. Drawing the complete structural sketch of the injection mold is a very important task in mold design;

(12) Check the relevant dimensions of the mold and the injection molding machine. Check the parameters of the injection molding machine used, including the maximum injection volume, injection pressure, clamping force, size of the installed part of the mold, verification of the opening stroke, and ejection mechanism;

(13) Conduct a preliminary review of the structural design of the injection mold and obtain user agreement. At the same time, it is necessary to confirm and modify the requirements put forward by the user;

(14) Draw the assembly drawing of the mold. Clearly indicate the assembly relationship between each part of the injection mold, necessary dimensions, serial numbers, detailed tables, title bars, and technical requirements;

(15) Draw the part drawing of the mold. The order of disassembling and drawing the part drawing of the mold from the assembly drawing or the component drawing is: first inside, then outside, first complex, then simple, first molding parts, and then structural parts;

(16) Review the design drawing. The final check of the injection mold design is the last line of defense for the design of the injection mold, and attention should be paid to the processing performance of the parts.

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