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How to improve the clamping force of injection molding?
2020-07-06

The clamping force refers to the large clamping force that can be applied to the mold by the mold clamping structure of the injection molding machine. It is set in order to resist the expansion force that occurs when the molten rubber fills the mold under a high injection pressure.

 

During injection molding, the concave and convex molds are tightly closed together, and then the molten plastic is injected into the cavity. In order to avoid the mold parting surface being pushed open by the cavity pressure, it is necessary to apply a clamping force to the mold, otherwise the parting surface will overflow, resulting in flashing of the product and greatly reducing the product yield. However, too much clamping force will not only increase the wear of the mold, reduce the exhaust effect in the cavity, cause the product to scorch or lack of material, but also improve the requirements for the injection molding machine: the machine is added with force, the wear is increased, and the shortened In addition to the mold clamping structure and the life of the hydraulic system, power spoilage will also be formed.

 

In addition to the unstable clamping force of the machine itself, it will reduce the yield of the product and shorten the service life of the injection molding process of the injection molding machine. The processing accuracy of the mold is not good enough, and the parallelism is not high enough. When the partial load is severe, it even causes the injection molding processing rod of the injection molding machine to crack, which stops the production and brings unnecessary losses to the enterprise.

 

The processing design of injection molds is highly valued in the field of industrial machinery today, and its applications are numerous and wide. There is an injection mold in mold design, which is also a more popular one. For the clamping force of injection molding,

so what should we pay attention to?

(1) The wall thickness should be as uniform as possible, and the draft angle should be large enough.

(2) The transition part should gradually and smoothly transition to prevent sharp corners.

(3) Gate. The runner should be as wide and thick as possible, and the gate position should be set according to the shrinkage and condensation process. If necessary, cold wells should be added.

(4) The surface of the mold is smooth and the roughness is low (0.8)

(5) The exhaust holes and grooves must be sufficient to exhaust the air and gas in the melt.

(6) In addition to PET, the wall thickness should not be too thin, generally not less than 1mm.

 

The maintenance of injection mold processing is very important. It should be known that any damage to the plastic mold processing factory may result in the suspension of production. Under the normal operation of the mold, test the performance of various parameters of the mold to determine the current condition of the mold. If there is a problem, the cavity, core, cooling system and parting surface can be detected for damage. At the same time, several important parts must also be tested for key points: ejection, the role of the guide component is to ensure the mold opening and closing movement and ejection of the plastic parts, if there is damage to the parts, it may stop production. Therefore, if there is any wear or other problems, it is necessary to detect them early to prevent unnecessary attacks.

 

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