Calculation of clamping force of vertical injection molding machine

The locking force of the vertical injection molding machine is expressed by the maximum value of the locking mould. Cavity injection material pressure out of the forming space (cavity) acts on the direction of opening the mold, so it must be below the clamping force, usually the material pressure must be below 80% of the clamping force. The material pressure is the product of the projection area of the forming space formed by the parallel pressure per unit area of the forming space. The average pressure per unit area of the forming space varies with the injection mechanism, for example, plunger type about 400-500 ㎏ / ㎝ and screw type about 250-350 ㎏ / ㎝.

(1) Empirical formula: Mold locking force of injection molding machine = average pressure per unit area of forming space × Projected area of forming space × Coefficient & times; The finished product long & times; The finished width & times; Note: The length and width unit of the finished product is cm; The unit of clamping force calculated is kg, divided by 1000 is the tonnage of the injection machine (T); The projection area of the forming space is the projection area of the finished product. For the finished product of the box type, it is necessary to expand the four sides of the finished product, and then measure its length and width.

(2) calculate the required tonnage of injection molding machine, and then choose the injection machine according to the calculation results (the injection molding machine tonnage must be greater than the calculation results). However, attention should be paid to the Coringian distance and the maximum and minimum die thickness of the selected injection machine. The maximum length and width of the mold must be less than the Coringian distance of the selected injection machine, and the height of the mold must be between the maximum and minimum die thickness of the selected injection machine.

According to the weight of the product or injection volume to choose different tonnage, such as 30T, 40T, 50T, 60T, 80T, 100T, 120T, 160T, 168T, 268T, the largest tonnage in China has 4000T, the larger the tonnage, the larger the screw diameter of the injection molding machine; …  How to choose the tonnage of injection molding machine for processing plastic parts.

Generally speaking, customers who have been in the injection molding industry for many years are likely to be able to judge and choose the right injection molding machine for production. However, in some cases, the customer may need the assistance of the manufacturer to decide which specification of the injection molding machine to use. The customer may even have only a sample or concept of the product and ask the manufacturer if the machine is ready for production or which model is suitable.

In addition, some special products may require special equipment such as accumulators, closed loops, injection compression, etc., to be produced more efficiently. It can be seen that how to decide the right injection molding machine to produce, is a very important problem.