Haochen AC, DC Plug Mould Factory tells you the progress of the mold operation

　Haochen AC, DC Plug Mould Factory tells you the progress of the mold operation

The upper die descends, the stretching punch and the necking punch start to work, and the elastic discharge plate presses the strip together to compress the spring under the floating guide pin. When the strip plate presses the strip against the concave mold, The above stretching process is ended. The upper die continues to descend, the spring on the stretching punch is tightened, and the stretching and flanging steps are performed together, followed by the notch, side blade, punching, and hole punching steps, and finally the blanking step. The upper die moves up, and under the effect of the discharge plate and the floating guide pin, the punch is successively separated from the strip, and the floating guide pin lifts the strip and can continue to feed forward.

1. Mould manufacturing process-the task book-the task book for forming plastic parts is generally proposed by the part planner, and its contents are as follows:

　　 1. The drawings of the formal parts that have been checked and approved, and indicate the trademark and transparency of the selected plastics.

　　 2. Specification or technical requirements of plastic parts.

　　 3. Production output.

　　 4. Samples of plastic parts.

　　General mold planning task book is proposed by plastic parts technologists based on forming plastic parts task book. Mold planners plan molds based on forming plastic parts task book and mold planning task book.

　　 2. Collect, analyze and digest the original materials

　　Collect related parts planning, molding process, molding equipment, machining and special processing materials for use in planning molds.

　　 1. Digest the drawings of plastic parts, understand the purpose of the parts, analyze the technicality of the plastic parts, standardize the accuracy and other technical requirements. For example, what are the requirements of plastic parts in terms of appearance shape, color transparency, application function, whether the geometric structure, slope, inserts, etc. of plastic parts are reasonable, and the degree of acceptance of molding defects such as weld marks and shrinkage holes, with or without coating After assembly, electroplating, bonding, drilling, etc. Select the specification with the highest precision of plastic parts for analysis, and see if the estimated molding tolerance is lower than the tolerance of the plastic parts, and whether the plastic parts that meet the requirements can be molded. In addition, it is necessary to understand the plasticization and molding process parameters of plastics.

　　 2. Digest the process materials, and analyze whether the requirements such as the molding method, equipment type, material specifications, and mold structure type proposed in the process task book are appropriate and can be implemented. The molding material should meet the strength requirements of plastic parts, with good fluidity, uniformity, isotropy and thermal stability. According to the use of plastic parts, the molding materials should meet the requirements of dyeing, metal plating conditions, decorative functions, necessary elasticity and plasticity, transparency or perhaps the opposite reflective function, adhesiveness or weldability.

　　3. Determine the molding method

　　 Choose direct pressure method, casting method or injection method.

　　 4. Select molding equipment

　　Moulds are made according to the type of molding equipment, so it is necessary to be familiar with the functions, specifications and characteristics of various molding equipment. For example, regarding the injection machine, the following should be understood in terms of specifications: injection capacity, clamping pressure, injection pressure, mold equipment specifications, ejection equipment and specifications, nozzle hole diameter and nozzle spherical radius, gate sleeve positioning ring specifications, The maximum and minimum thickness of the mold, the stroke of the template, etc., see the relevant parameters for details. To begin to estimate the mold shape specifications, determine whether the mold can be used in the equipment and application of the selected injection machine.

　　5. Specific structural plan

　　 (1) Determine the mold type

　　 Such as compression mold (open type, semi-closed type, closed type), casting mold, injection mold, etc.

　　 (2) Determine the primary structure of the mold type

　　The choice of aspiring mold structure is to determine the necessary molding equipment, the number of aspirational cavities, and under certain reliable conditions, the operation of the mold itself can meet the requirements of the process technology and production economy of the plastic parts. The technical requirements for plastic parts are to ensure the geometry, surface finish and standard precision of the plastic parts. The economic requirements for production are to make the cost of plastic parts low, high production efficiency, continuous operation of the mold, long service life, and labor saving.

　　 Third, there are many factors that affect the mold structure and the single system of the mold, which are very complicated:

　　 1. Cavity layout. Judging the number of cavities and their placement method according to the geometrical features of the plastic parts, standard precision requirements, batch size, mold manufacturing difficulty, mold cost, etc.

Regarding the injection mold, the precision of plastic parts is 3 and 3a, the weight is 5 grams, the hardening pouring system is selected, and the number of cavities is 4-6; the general precision of plastic parts (4-5), molding The material is partially crystalline material, the number of cavities can be 16-20; the weight of plastic parts is 12-16 grams, the number of cavities is 8-12; and the weight of plastic parts 50-50 grams, the number of cavities is taken 4-8. Regarding amorphous plastic parts, the recommended number of cavities is 24-48, 16-32 and 6-10. When further increasing the weight of plastic parts, multi-cavity molds are rarely used. For plastic parts of grade 7-9 precision, the maximum number of cavities is increased to 50% compared with the plastics of grade 4-5 precision indicated.

　　 2. Determine the parting surface. The orientation of the parting surface should be conducive to mold processing, exhaust, demolding and forming operations, and the surface quality of plastic parts.

　　3. Determine the pouring system (the shape, orientation and size of the main sprue, sub-runner and gate) and the exhaust system (exhaust method, exhaust slot orientation and size).

　　 4. Choose the ejection method (ejection rod, ejector tube, push plate, combined ejection), choose the undercut treatment method, core pulling method.

　　 5. Choose the method of cooling and heating and the shape and orientation of the heating and cooling groove, and the equipment parts of the heating element.