Five technological ingenuity to solve injection molding plastic deformation method

Five technological ingenuity to lead you solve when injection molding plastic deformation method

plastic injection molding parts

The causes of deformation
1) the shape of products, especially forming shrinkage relationship with product thickness caused by residual stress
2) Due to the forming conditions of residual stress in
3) parting the residual stress produced in
4) and deformation due to insufficient cooling time

2. The associated knowledge
1) the deformation of the products (warping, bending, small wrinkles) as well as the reasons of the crack.The residual internal stress in the products.Molding set conditions should be set in eliminate products of internal stress direction. Namely improve material barrel temperature and mould temperature, the material liquid get better state, the injection pressure is not too high.
2) in order to reduce the residual stress, annealing processing, namely under thermal deformation temperature of 10 degrees, more than 2 hours of heating has the effect of stress relief. But this way because of the high cost of annealing and use is not common.
3) if the mould cooling hole not to cooling homogeneity of products, also can produce residual stress, which means that the cooling hole can’t be too shallow.

Third, solution.
1) instant: sufficient cooling solidification in the mould (chronograph longer cooling time), and improve the temperature of the material, reduce the injection molding pressure.
2) short-term: make mold cooling uniformity.
3) long-term: avoid the thickness of products, where product thickness large set gate (1-1), caused by a straight line easy to warp, make it big R curve, products reversible bending die, increase the number of ejection rod, increase the draft.

Four, differences in material:
1) the crystalline materials (poly (PVC), polypropylene, pom, nylon),injection molding shrinkage rate, and easy to cause bias, non-crystalline material (polystyrene (PVC, ABS) easy to cause residual stress.

Five, the reference items:
1) use orthotics keep at room temperature after molding, to prevent deformation, slightly but not hope too much.
2) in the box forming of thin shape, bending caused by injection molding temperature, this is common thermal expansion

Plastic injection molding product with chrome plated

Chrome-plated plastic, high-quality surface finish can be comparable with the metal surface to its light weight, ease of processing and use of broad characteristics, prompting the chrome-plated plastic is widely used in the automotive industry, as well as a variety of industrial production and daily life, our injection molding plastics technology can deal difference kind of chrome plated plastic molding parts with enough experience .


Plastic Injection Molding, Plastic Molded Parts

We combine plastic injection molding design, engineering and manufacturing in shanghai with engineering and tool making operations , Cnmoulding capability that cuts lead times and allows for competitive baseline pricing. we added plastic injection molding design and engineering associates to implement “follow the sun engineering.” Our engineering counterparts in China start work on projects as we’re winding down for the day here in shanghai. The workflow doesn’t stop, because each group turns its progress over to the other at the end of the day.
Our plastic injection molding engineers and toolmakers are trained and certified on our UG-NX system, so they’re an integral part of our concurrent engineering capabilities and can interface with customer ERP systems.

To discuss your plastic injection molding and plastics tooling manufacturing requirements—and how our global resources, process engineering and emphasis on continuous improvement can support them—contact kennyhan, at 0086-13061707408 or email us.