The design steps and precautions for injection molds, I believe many people in the industry will study this issue carefully:

1. Preparation work before design

(1) Design Task Book

(2) Familiar with plastic parts, including their geometric shapes, usage requirements, and raw materials

(3) Check the formability of plastic parts

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

2. Develop a molding process card

(1) Overview of the product, including schematic diagram, weight, wall thickness, projected area, external dimensions, presence or absence of side indentations and inserts

(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 include the relevant dimensions between the injection machine and the installation mold, screw type, and power

(4) Injection molding machine pressure and stroke

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

3. Design steps for injection mold structure

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

(2) Select the parting surface. The principle should be that the mold structure is simple, easy to type, and does not affect the appearance and use of the plastic parts

(3) Determine the layout plan of the cavity. Use balanced arrangement as much as possible

(4) Determine the pouring system. Including main channels, branch channels, gates, cold material pockets, etc.

(5) Determine the demolding method. Design different demolding methods based on the different parts of the mold left by the plastic parts.

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

(7) When determining whether the concave mold or core adopts a block structure, the machinability and installation fixing method of dividing the blocks and simultaneously inserting them are discussed.

(8) Determine the exhaust form. Generally, exhaust can utilize the gap between the mold parting surface and the ejection mechanism, while for large and high-speed injection molds, corresponding exhaust forms must be designed.

(9) Determine the main dimensions of the injection mold. Calculate the working dimensions of the formed parts according to the corresponding formulas and determine the thickness of the side walls of the mold cavity, the bottom plate of the cavity, the core pad, the thickness of the dynamic template, the thickness of the cavity plate of the modular cavity, and the closing height of the injection mold.

(10) Select standard mold frame. Select the standard mold frame for the injection mold based on the main dimensions of the designed and calculated injection mold, and try to choose standard mold parts as much as possible.

(11) Draw a structural sketch of the mold. Drawing a complete structural sketch of an injection mold is a crucial task in mold design.

(12) Verify the relevant dimensions of the mold and injection machine. Verify the parameters of the injection machine used, including maximum injection volume, injection pressure, mold locking force, as well as the dimensions 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, while it is necessary to confirm and modify the user's requirements.

(14) Draw the assembly diagram of the mold. Clearly state the assembly relationship, necessary dimensions, serial numbers, detailed lists, title blocks, and technical requirements of each part of injection molding (the technical requirements include the following: 1. Performance requirements for the mold structure, such as assembly requirements for the ejection mechanism and core pulling mechanism; 2. Requirements for the mold assembly process, such as the fitting gap of the parting surface and the parallelism of the upper and lower parts of the mold; 3. Requirements for the use of the mold; 4. Requirements for anti-oxidation treatment, mold number, engraving, oil seal and storage; 5. Requirements for mold testing and inspection.).

(15) Draw a mold component diagram. The order of disassembling and drawing part drawings from mold assembly drawings or component drawings is: from inside to outside, from complex to simple, from molded parts to structural parts.

(16) Review 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 machining performance of the parts.