How to choose the specification model of injection molding machine?
When selecting the size of the injection molding machine, the first thing to check is the performance parameters of the injection molding machine in the product specifications provided by the injection molding machine manufacturer.These parameters value indicates the characteristics of injection molding machine, the user can according to need to produce plastic products ー some technical requirements (such as the products with raw materials, products quality, size and shape forming die height, etc.) to find the equipment specifications, and close to parameters in the parameter values of the injection molding machine model is to choose and buy of injection molding machine model.
Specifications is the key to control data in product quality (or volume), the size and shape of clamping force (kN) and instruction in the corresponding parameter value proportion relations, injection quantity and quality of the plastic injection molding machine theory (or volume) ratio between requirements, the production of high degrees of size and shape mould thickness size and trip distance between injection molding machine template size requirement, etc.The calculation method is as follows.
Also, the amount of flux used for products.
Q=kX(product quality + material for runner system)
Where, k -- coefficient is 1.1 ~ 1.3.
Parliamentary injection molding machine production of this product should inject the amount of melting materials.
Qs = Q x 1.05 / rho r
The latter is the artifact density.
So, we're computing an example.The quality of a PE product is 220g, and the amount of material used in the runner system is
20g, what is the amount of melting material required to produce this product?
A. Amount of molten material required for product molding: Q=1.2X(220+20)=280(g)
B. The amount of injection marking required for molding products by injection molding machine Qs=280 * 1.05/0.92= 319.5(g).
The theoretical injection volume of the injection molding machine model used to produce this part should be slightly larger than 319.5g.
To calculate the molding force for injection moulding products.
Die force = calculating the area of vertical projection on the template with coefficient x product
The F = kS
Where, F -- combined mode force, t;
S -- projection area of products, cm2;
K -- injection coefficient of different materials, t/cm2.
The k values of different materials are shown in table 1.
The minimum distance of mold joint stroke is calculated according to the product height.The travel distance of the template is large
Table 1 k values for calculating the combined force of different plastics injection
Material name PE PP PS ABS PA other engineering plastics
(k/t/cm2) from 0.32 0.32 0.32 0.32 0.48 0.64 ~ 0.72 0.64 ~ 0.80
Small by the height of the injection plastic products and mould (moving parts mould) to determine the thickness of the size, the template trip distance dimensions should be greater than moving mould thickness 2 times more, can take out after mould injection molding parts shall prevail.