When we use the injection molding machine, we need to carefully understand the model and specification of the injection molding machine, because the parameters of the injection molding machine have a greater impact on the production cost, quality and efficiency of injection products. How to choose the right injection molding machine?Injection Machines Molding
First, the selection method of injection molding machine
We should check the product specification provided by the injection molding machine manufacturer. The specification has the performance parameters of the injection molding machine, including the type of raw materials, the quality (weight) of the products, the shape design size and so on. You can sort out what kind of parameters you need, and then compare with the parameters of the injection molding machine, the value is close to the injection molding machine is worth choosing.
In addition, we also need to understand the processing accuracy, production speed and product accuracy of the injection molding machine, to see whether it meets the molding conditions of the product. In order to facilitate the mold assembly, the spacing size of the tie rod should be greater than the width and height of the mold. The size of the injection molding machine template should conform to the size requirements of the molding mold when it is installed and fixed.
Two, injection molding machine operation items
There are many operation items of injection molding machine, which can carry out the selection of injection process action, feeding action, injection pressure, injection speed, ejection type, the control of the temperature of each section of the cylinder, the adjustment of injection pressure and back pressure. Operation items of injection molding machine mainly include three aspects, that is, control keyboard operation, electrical control cabinet operation and hydraulic system operation.Injection Machines Molding
Three, the molding process of screw injection molding machine
The working principle of injection molding machine is similar to that of syringe, which is a cyclic process. Its flow is: quantitative feeding — melting plasticizing — pressure injection — filling cooling — opening and taking out parts — removing plastic parts — closing the mold — and carrying on the next cycle.
The specific steps are as follows:
1. Add granular or powdery plastic into the barrel, and process the plastic into a molten state by rotating the screw and heating the outer wall of the barrel.
2, the mold closing and injection seat forward steps, so that the nozzle is close to the mold gate passage.
3. Put the pressure oil into the injection cylinder, push the screw forward, and inject the molten material into the closed die with lower temperature at a higher pressure and faster speed.
4, such as plastic curing molding, open the mold out of the product.
