How to deal with warpage and deformation during plastic mold injection?
Warping and deformation of plastic injection molded products is a very difficult problem. It should be dealt with mainly from the aspect of mold planning, while the adjustment of molding conditions is very limited. So, how do we deal with warping and deformation of plastic mold injection products?
1. When the stress deformation is caused by poor demoulding, it can be dealt with by increasing the number or area of push rods, setting the demoulding slope, etc.
2. When the deformation is caused by the residual stress caused by the molding conditions, the stress can be eliminated by reducing the injection pressure, raising the mold and making the mold temperature uniform, increasing the resin temperature or annealing.
3. When the cooling method is not suitable, the cooling method is not uniform or the cooling time is insufficient, the cooling method can be adjusted and the cooling time can be extended. For example, cooling circuits can be placed as close as possible to the deformation.
4. Regarding the deformation caused by the shortening of the molding, it is necessary to modify the design of the mold. Among them, the most important thing is to pay attention to the uniform wall thickness of the product. Sometimes, as a last resort, the mold has to be corrected by measuring the deformation of the product and trimming the mold in the opposite direction. Resins with a large shortening rate are generally crystalline resins (such as polyoxymethylene, nylon, polypropylene, polyethylene and PET resins, etc.) than non-crystalline resins (such as PMMA resin, polyvinyl chloride, polystyrene, ABS resin and AS resin, etc.) have large deformation. In addition, since glass fiber-reinforced resin has fiber orientation, deformation is also large.
Product Name: Outdoor Waste Sorting Box Plastic Injection Mould
Brand Name: Anye
Place of Origin: Taizhou, Zhejiang, China
Model: MH-107
Molding mode: plastic injection mold
Product material: plastic
Product: Household Products
Mould Name: Injection Mould
Mold material: NAK80, S136, 2316, 2738, H13, 5CrNiMo, 718H, P20, 40Cr, 60#, 45#, etc.
Demoulding type: automatic ejection (ejector rod, damper, ejector plate, hydraulic cylinder)
Mold base: 45#, S50C, LKM, etc.
Gate: hot runner, cold runner, pin gate, subsea gate, etc.
Product use: storage of domestic waste, kitchen waste, etc.