Cracking defects caused by external stress during injection molding

1.Unreasonable design:

Product design has sharp Angle, sharp edge and other geometric shapes, these positions are easy to cause stress concentration, thus leading to cracking. Mold design problems, such as small release slope, rough mold cavity and convex mold surface, increase the release force during release, and are easy to produce stress.

Therefore, in the product design, the shape of sharp corners and sharp edges is minimized, and the smooth transition is adopted to reduce the stress concentration. In the mold design, a reasonable release slope is added to ensure that the mold cavity and convex mold surface are smooth and reduce the push-out force. In addition, we can optimize the molding process by adjusting the molding parameters, such as injection speed, mold temperature, and pressure retention time, to reduce the stress generation in the molding process. Preheat the mold before forming, to reduce the temperature difference between the mold and the material, and help to reduce the residual stress after forming.

2.External force:

In the process of transportation, storage or use, the products are external impact, extrusion and other improper operations, resulting in stress concentration and cracking.

Therefore, we can add reinforced fibers, fillers, etc. to the resin material to improve the strength and toughness of the material to resist external stresses. After the product molding, conduct the necessary subsequent treatment, such as heat treatment, annealing, etc., in order to eliminate or reduce the residual stress in the product. During the transportation, storage and use process, avoid the improper operation of the products, such as impact and extrusion, so as to prevent the damage caused by external stresses.

3.Exotic environment

Chemicals, water degradation caused by moisture absorption, and excessive use of recycled materials will make material deterioration, produce cracking.

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