Injection mold design steps and precautions, I believe many people in the industry will study this issue well:

1. Preparation before design

(1) Design assignment

(2) Familiar with plastic parts, including their geometry, use requirements and raw materials

(3) Check the molding process of plastic parts

(4) Define the model and specification of the injection molding machine

2. Formulate forming process card

(1) Product overview (such as sketch, weight, wall thickness, projection area, outline dimension, whether there is side recess and insert)

(2) 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 installation mold, screw type and power

(4) Pressure and stroke of injection molding machine

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

3. Design steps of injection mold structure

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

(2) Select the runoff surface. It shall be based on the principle of simple mold structure, easy parting and no impact on the appearance and use of plastic parts

(3) Determine the layout of the cavity. Balanced arrangement shall be adopted as far as possible

(4) Determine the gating system. Including main flow channel, shunt channel, gate, cold material pocket, etc.

(5) Determine the demoulding method. Different demoulding methods are designed according to the different parts of the plastic parts left in the mold.

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

(7) When it is determined that the insert structure is adopted for the female die or core, the processability and the installation and fixing mode of the insert are divided and inserted at the same time.

(8) Determine the exhaust form. Generally, the exhaust can be made use of the parting surface of the mold and the clearance between the ejection mechanism and the mold. For large and high-speed injection molds, the corresponding exhaust form must be designed.

(9) Determine the main dimensions of the injection mold. According to the corresponding formula, calculate the working dimension of the molding part and determine the thickness of the side wall of the mold cavity, the cavity bottom plate, the core pad, the thickness of the movable template, the cavity plate thickness of the block type cavity and the closing height of the injection mold.

(10) Select standard mold base. According to the main dimensions of the injection mold designed and calculated, the standard mold base of the injection mold shall be selected, and the standard mold parts shall be selected as much as possible.

(11) Draw the structure sketch of the mold. Drawing the complete structure sketch of injection mold and drawing the mold structure drawing is a very important work of mold design.

(12) Check the relevant dimensions of the mold and the injection machine. Check the parameters of the injection machine used: including the maximum injection volume, injection pressure, mold locking force, and the size of the mold installation part, mold opening stroke and ejection mechanism.

(13) Review of injection mold structure design. Conduct preliminary review and obtain the user's consent. Meanwhile, it is necessary to confirm and modify the user's requirements.

(14) Draw the assembly drawing of the mold. Clearly indicate the assembly relationship, necessary dimensions, serial numbers, details of all parts to be injected Title block and technical requirements (the contents of the technical requirements are as follows: 1. The performance requirements for the mold structure, such as the assembly requirements for the ejection mechanism and the core pulling mechanism; 2. The requirements for the mold assembly process, such as the bonding gap of the parting surface and the parallelism of the upper and lower parts of the mold; 3. The requirements for the use of the mold; 4. The requirements for anti-oxidation treatment, mold number, lettering, oil seal and storage; 5. The requirements for the test and inspection.).

(15) Draw the mold part drawing. The order of drawing the part drawing from the mold assembly drawing or the part drawing is: from the inside to the outside, from the complex to the simple, from the formed part to the structural part.

(16) Recheck the design drawings. The final review of injection mold design is the final check of injection mold design, and more attention should be paid to the processing performance of parts.