injection mold, causes and solutions for warping and distortion of plastic mold injection molding products
The deformation, bending and distortion of plastic mold injection molding products is mainly due to the large shrinkage of the flow direction when plastic molding is larger than the vertical direction, so that the shrinkage rate of the parts in different directions is different. The warping is caused by the inevitable residual internal stress in the part when the injection mold is filled. The deformation, bending and distortion of plastic mold injection molding products is mainly due to the large shrinkage of the flow direction when plastic molding is larger than the vertical direction, so that the shrinkage rate of the parts in different directions is different. The warping is caused by the inevitable residual internal stress in the part when the injection mold is filled. The following are the causes and solutions for warping and distortion of plastic mold injection mold products compiled by the editor of Donglai plastic mold manufacturer.
1. Inadequate or uneven cooling causes the epulsion out when it is not completely cooled. The top thrust of the top rod often deforms the molded part, so if it is not fully cooled, it will be deformed. The solution is to fully cool the mold cavity and wait for it to be completely hardened before it can be pushed out. It can also reduce the mold temperature and extend the cooling time.
2. The deformation caused by the molding strain caused by the molding strain is mainly caused by the difference in the direction of the molding contraction and the change of wall thickness. Therefore, increasing the mold temperature, increasing the melt temperature, reducing the injection pressure, and improving the flow conditions of the pouring system can reduce the difference in the direction of the shrinkage rate.
3. The top rod causes the demoulding of some parts to be poor, and the top rod is used to forcibly remove the mold, resulting in deformation. For plastic parts that are not easy to deform, they do not produce deformation but cracks. The elimination method is to improve the polishing of the mold and make it easy to demould. Sometimes the use of mold release agent can also improve the mold removal.
4. The method of correcting the warping of the product. If the product taken out of the mold is to be corrected, the simple method is to put the product to be corrected on the correction tool and add the weight to the warping place, but the weight of the heavy object must be clearly determined with the place. Or put the warped product on the straightener, put it in the hot water near the thermal deformation temperature of the product, and simply straighten it by hand. However, it should be noted that the temperature of hot water should not be too high, otherwise the deformation of the product will be more harmful.