The so-called enhanced injection products, generally refers to the injection molding products containing glass fiber. In injection molding the injection molding products, because the distribution of the different content of glass fiber, glass fiber, glass fiber of different length and the different direction of contraction, the intensity and size precision plastic parts of the difference, the difference will bring adverse effect on the performance of plastic parts, therefore, in the design of reinforced injection molding products should pay attention to the following a few points. Wall thickness design tries to evenly, avoid forming because of uneven shrinkage and deformation. In addition, the wall thickness can not be too thin, if the wall thickness is less than 0.8mm, will make the plastic parts surface density and core layer density is not consistent, caused by unstable mechanical properties, and the fiber distribution is not uniform. General wall thickness shall be not less than 2mm, to meet the conditions of flow characteristics and forming process of molten material. The location, size, form the gate will directly affect the plastic parts of the weld shape and fiber length distribution in plastic and parts, plastic parts in the design should consider strengthening ribs are arranged, so as to improve the intensity of plastic parts. Thread strength of short glass fiber reinforced ratio of long glass fiber reinforced high, if the plastic parts are the same, the design principles, but not suitable for the production of fine thread. The enhanced surface plastic product surface did not enhance the rough, not suitable for the product decoration structure. But if increasing the mold temperature, melt temperature, injection speed, can improve the part surface roughness, and obtain higher size accuracy. Reinforced plastic shrinkage and surface roughness, friction force the release, so the draft should be larger, in general should be more than 1.5 degrees. |