Plastic mold design process
For example, what are the requirements for the appearance, color transparency, and performance of plastic parts, whether the geometrical structure, slope, inserts, etc. of the plastic parts are reasonable, the allowable degree of molding defects such as weld lines and shrinkage holes, and whether or not they are coated Post-processing such as loading, plating, gluing, drilling, etc. Steam Trap,Flange Drain Primer Valve,Floating Ball Drain Valve,Floating Ball Steam Trap Chongqing Xingjida Import and Export Trade Co., Ltd. , https://www.xjdvalve.com
1. The task book for accepting the task book to form plastic parts is usually proposed by the part designer. The contents are as follows:
(1) The drawings of the formal manufacturing parts that have been examined, and indicate the grades and transparency of the plastics used.
(2) Plastic parts specifications or technical requirements.
(3) Production output.
(4) Samples of plastic parts. Usually, the mold design task book is proposed by the plastic parts craftsman according to the task book of the molded plastic parts. The mold design personnel design the mold based on the molded plastic parts task book and the mold design task book.
2. Collecting, analyzing, and digesting the original data to collect and organize related parts design, molding process, molding equipment, machining and special processing materials, in order to use when designing molds.
(1) Digest the plastic parts drawing, understand the use of the parts, analyze the technical requirements of the plastic parts, dimensional accuracy and other technical requirements. For example, what are the requirements for the appearance, color transparency, and performance of plastic parts, whether the geometrical structure, slope, inserts, etc. of the plastic parts are reasonable, the allowable degree of molding defects such as weld lines and shrinkage holes, and whether or not they are coated Post-processing such as loading, plating, gluing, drilling, etc. Select the size of the plastic part with the highest dimensional accuracy for analysis to see if the estimated molding tolerance is lower than the tolerance of the plastic part, and whether the desired plastic part can be formed. In addition, it is necessary to understand the plasticization and molding process parameters of plastics.
(2) Digestion process data, analysis of the requirements of the molding method, equipment model, material specification, mold structure type, etc. proposed in the process task book, whether it can be implemented. The molding material should meet the strength requirements of plastic parts, with good fluidity, uniformity, isotropy and thermal stability. Depending on the use of the plastic part, the molding material should meet the requirements for dyeing, metallization, decorative properties, necessary elasticity and plasticity, transparency or reverse reflection properties, adhesive properties or weldability.
Third, determine the molding method
Using direct pressure method, casting method or injection method
Fourth, choose molding equipment
The mold is carried out according to the type of molding equipment, so it is necessary to be familiar with the performance, specifications, and characteristics of various molding equipment. For example, for the injection machine, the following should be understood in terms of specifications: injection capacity, mold clamping pressure, injection pressure, mold mounting size, ejection device and size, nozzle hole diameter and nozzle spherical radius, gate sleeve positioning ring size, The maximum thickness and minimum thickness of the mold, the stroke of the template, etc., see the relevant parameters. To initially estimate the mold dimensions, determine if the mold can be installed and used on the selected injection machine.
Five, the specific structure of the program
(1) Determine the mold type such as a press mold (open type, semi-closed type, closed type), a casting mold, an injection mold, and the like.
(2) Determining the main structure of the mold type The ideal mold structure is to determine the necessary molding equipment, the ideal number of cavities, and under the absolutely reliable conditions, the work 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 dimensional accuracy of the plastic parts. The economic requirement of production is to make the cost of plastic parts low, the production efficiency is high, the mold can work continuously, the service life is long, and labor is saved.
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