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How to Solve Warp and Deformation of Injection Mould Products?

The warping and deformation of plastic injection mould products is a knotty problem. It should be solved mainly from injection mould design, while the adjustment effect under moulding condition is very limited. So, how to solve the warping and deformation of plastic injection mould products? Please find the answer below:

          Warp and Deformation of Injection Moulded Part                  Warp and Deformation of Injection Moulded Part

  • When poor mould release causes stress deformation, it can be solved by these methods, such as increasing the number or area of putter and setting draft, etc.

  •  When the deformation of residual stress is caused by the forming condition, the stress can be eliminated by reducing the injection pressure, increasing the injection mould temperature and making the mould temperature uniform and improving the resin temperature or the annealing method.

  • When the cooling is not uniform or the cooling time is insufficient due to the inappropriate cooling method, which can adopt the solutions, such as adjusting the cooling method and prolonging the cooling time, etc. Such as, Set the cooling circuit at the place where is as close to the deformation as possible.

  • For the deformation caused by moulding shrinkage, the design of the mould must be corrected. Among them, the most important thing is to pay attention to make the thickness of product wall consistent. Sometimes, in the case of last resort, we can only correct the product by measuring the deformation of the product and dressing the mould in the opposite direction. Resins with a higher shrinkage rate is generally that the deformation of crystalline resins (such as polyoxymethylene, nylon, polypropylene, polyethylene, PET, etc.) is larger than non-crystalline resins (such as PMMA resin, polyvinyl chloride, polystyrene, ABS resin. In addition, since the glass fiber-reinforced resin has fiber alignment properties, the deformation is also large.
If plastic injection molding products appear overflow problem, how to solve?
For the overflow problem, the emphasis should be on the improvement of the mould. In terms of moulding conditions, we can start with the reduction of liquidity. Specific solutions can be adopted as follows:
  • Reduce the mould temperature.
  • Reduce injection pressure.
  • Lower the resin temperature.
  • Increase the clamping force.
  • Grind the mould surface that have overflow problem..
  • Use materials with high viscosity grade.
  • Use harder mould steel.
  • Adjust the joint surface of accurate die.
  • Increase the mould support column to increase rigidity.
  • Determine the size of different exhaust slots based on different materials.

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