During The Injection Molding Process, The Formation Mechanism And Solution Of The Warpage Deformation Of The Lamp Products

During the injection molding process, the formation mechanism and solution of the warpage deformation of the lamp products

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The warping deformation of the plastic parts of the car lamp is mainly due to the stress of the plastic parts. When the force between the macromolecules of the plastic parts is
When the stress is not maintained, the plastic parts will warp and deform.
(1) The cause of warpage and deformation.
Material influence: the superposition of the large shrinkage rate of crystalline plastics and the anisotropy of shrinkage leads to the tendency of warping deformation
The direction is larger; the molecular orientation of the material is too large.
Influence of product design: uneven product wall thickness design makes the cooling rate of different parts unbalanced, which makes it difficult to realize
The product shrinks evenly.
Problems with mold design: Unreasonable design of mold release and exhaust system; uneven arrangement of mold cooling water channels, resulting in
The temperature difference between the product cavity and the core is large; the strength and positioning accuracy of the mold cannot meet the requirements.
Problems in the injection molding process: too high barrel temperature and melt temperature; too high injection pressure or too fast injection speed; mold
Uneven cooling; cooling time is too short, the part is ejected before it is fully cooled, and the ejector pin exerts pressure on the surface
Cause warping and deformation.
(2) Common methods to solve warpage and deformation
Adjust the structure of the plastic parts, try to make the product wall thickness consistent, or heat the plastic parts after forming; try to avoid choosing
Use plastic materials with larger shrinkage or fiber orientation; reasonably design the demolding angle, and correctly determine the position and
Quantity, improve the strength and positioning accuracy of the mold; improve the mold grinding process, or trim the product in the opposite direction of the deformation
Mold; improve mold cooling water circuit, try to ensure even cooling. When deformation is caused by residual stress, it can be reduced by
Low injection pressure, injection speed or annealing method to eliminate stress