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Precision plastic injection moulds

by:CSSSLD     2021-02-03
Precision injection molding processing plastic parts had better use push plate mold release, to do so is helpful to prevent the plastic demoulding deformation. But if you can't use push plate mold release, you must consider using other suitable launched demoulding mechanism. For example, for rectangular plastic parts with thin ribs, in order to smooth demoulding and prevent deformation of plastic, can be in a small diameter circular ribs push rod or width of the small rectangular push rod, as well as equilibrium configuration.

as far as possible in the form of blind hole type whole set spell, this form of structure stiffness is better. No matter what form of fastening frame, they typically require made of alloy structural steel, and also need to deal with the conditioning, around 30 HRC hardness requirements. Parts campaign in precision injection mold, if not accurate, namely after every movement can't accurate return to its original position, so no matter how much mold parts processing precision is high, the structure accuracy and the precision of the plastic parts of the mold will appear a large fluctuations.

precision injection mold of the cooling water temperature regulation accuracy should be able to achieve & plusmn; 0. And the outlet temperature 5 ℃, water entry should be controlled within 2 ℃. In addition, in the precision injection mold, it is better to set up respectively of convex die and concave die cooling waterway, otherwise the shrinkage rate in all parts of the plastic parts may appear bigger difference, the precision of plastic parts cannot be guaranteed. Precision injection molded parts is generally not a very big size, wall thickness is thin, and some even with many thin ribs, so it is easy to deformation when parting, the deformation will inevitably cause the loss of precision plastic parts.

precision injection mold design, if the mould structure or improper temperature control system design, easy to appear uneven shrinkage rate of plastic phenomenon, the phenomenon of the precision of plastic parts and plastic parts precision stability will produce adverse effects. In multi-cavity injection mold, if through the gating system of the plastic melt cannot reach and fills the cavity, which adopted the non-equilibrium type gating system, so that the melt in the cavity pressure will be different, so in the same mold in the cavity between the plastic forming parts, shrinkage rate tend to have very big difference, therefore, multi-cavity precision balanced arrangement of gating system of injection moulds should be adopted.

cavity configuration form not only affects the balance of gating system, but also the temperature field of thermal equilibrium has much to do and die. Obviously, if the mould temperature can't keep the heat balance, the shrinkage rate of plastic won't be able to maintain uniform and stable, so the precision injection also is impossible. Practice has proved that in order to ensure that the temperature field of thermal equilibrium and the material flow balance of gating system, the design of multi-cavity precision injection mold, the mold cavity number not more than 4 as far as possible.

precision injection mold must have enough stiffness, otherwise, they are under the effect of injection pressure and clamping force will happen bigger elastic deformation, causing change mould precision, and thus affect the precision of injection molding processing. For monolithic convex and concave die, its structure stiffness needs to be a free agent, size and advanced materials to ensure that the shape of the for the insert or spell convex and concave die, its structure stiffness is often associated with fastening frame used in the insert. Multi-cavity

used for precision injection molding, in order to keep the temperature of each cavity, as far as possible to prevent plastic shrinkage caused by the cavity temperature difference between difference, mold temperature control system in the best of each cavity adjust alone, that is to set up separately for each cavity cooling waterway, and it should be installed in each cavity of the cooling water outlet flow control device, so as to enable each waterway traffic.

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