Warping and deformation of the Table Mould are very difficult problems. It should be dealt with mainly from the aspect of mould planning, while the adjustment effect of moulding conditions is very limited. So, how do we deal with the warpage and deformation of the table mould injection products?
1. When stress deformation is caused by poor demoulding, it can be treated by increasing the number or area of push rods and setting demoulding slope.
2. When residual stress is deformed due to moulding conditions, the stress can be eliminated by lowering injection pressure, increasing the mould and making the mould temperature uniform and increasing the resin temperature or by annealing.
3, because the cooling method is not appropriate, make the cooling uneven or insufficient cooling time, can adjust the cooling method and prolong the cooling time, etc. For example, a cooling circuit may be provided as close to the deformation as possible.
4. With regard to the deformation caused by shortening of moulding, the mould planning must be revised. Among them, the most important thing is to pay attention to the common wall thickness of products. Sometimes, in case of necessity, one has to measure the deformation of the product, trim the mould in the opposite direction and correct it. Resins with higher shortening rate are generally crystalline resins (such AS polyoxymethylene, nylon, polypropylene, polyethylene, PET resin, etc.) with larger deformation than amorphous resins (such as PMMA resin, polyvinyl chloride, polystyrene, ABS resin, AS resin, etc.). In addition, because the glass fiber reinforced resin has fiber alignment, the deformation is also large.
