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  W hat are the common design rules in plastic design ?   The following is a description of the key points of the plastic product structure design   The structural design of plastic product development should follow the following principles:   a. The structure design should be reasonable: the assembly gap is reasonable, and all plug-in structures should be reserved for gaps; ensure sufficient strength and rigidity (safety test), and properly design a reasonable safety factor.   b. The structural design of plastic parts should comprehensively consider the manufacturability of the mold, and simplify the manufacturing of the mold as much as possible.   c. The plasticity of the structure of plastic parts should be considered, that is, the injection molding production efficiency of the custom plastic injection molding companies should be high, and the rejection rate of injection molding should be minimized.   d. Consider facilitating assembly production (es...

  P lastic I njection M oulding A dvantages and D isadvantages   Compression molding is the operation of first putting powdered, granular, or fibrous plastic into the mold cavity at the molding temperature, and then closing the mold to press to shape and solidify it. C ompression moulding method  can be used for thermosetting plastics, thermoplastics, and rubber materials.   Advantages of injection moulding over compression moulding (1) In the custom plastic compression moulding process, the loss of raw materials is small and will not cause too much loss (usually 2% to 5% of product quality).   (2) The internal stress of the product is very low, and the warpage deformation is also small, and the mechanical properties are relatively stable.   (3) The wear of the mold cavity is small, and the maintenance cost of the mold is low.   (4) The cost of molding equipment is low, and its mold structure is simpler, and its manufacturing cost is usually lower than...

  I njection M olding D efects and S olutions In the daily production of modified plastic injection molding, some problems are likely to occur. The more common defects mainly include dark spots, gloss differences, and surface wrinkles (also known as orange peel). Generally speaking, these defects are often Occurs near the gate, so today we will analyze the causes of the defects from the mold and molding process.   Gloss difference   For injection molding plastic products, the difference in gloss on the surface of the textured product is most obvious. Even if the surface of the mold is very uniform, an irregular gloss may appear on the product. That is to say, the mold surface effect of some parts of the product is not well reproduced.   As the distance of the melt from the gate gradually increases, the injection pressure of the melt gradually decreases. If the distal end of the gate of the product cannot be filled, the pressure there is the lowest, so that the textur...

  Nowadays, the trend of processing technology is developing with high and new technology. These technologies include micro injection molding, high filling compound injection, water assisted injection molding, mixing and using various special injection molding processes, foam injection molding, mold technology, simulation technology and so on.   The injection manufacturing process  mainly includes four stages: filling, pressure maintaining, cooling and demoulding. These four stages directly determine the quality of the products. It is a complete continuous process.   1. Filling stage   Filling is the first step in the whole process of injection manufacturing process, from the beginning of injection molding when the mold is closed to about 95% of the mold cavity filling. Theoretically, the shorter the filling time is, the higher the molding efficiency is. But in practice, the molding time or injection speed is restricted by many conditions.   2. Pressure mai...

1. The fitter stage of automotive mould The fitter stage of the automotive mould includes: mold benchmarking - mold clamping - mold trial - sampling, etc. After the NC processing of the automotive mould, there is still a certain margin for the follow-up fitter. The fitter debugging mainly checks the lapping-in rate of the upper and lower molds and the oriented lapping-in rate so as to ensure that qualified stamping parts are stamped out. Through mold fitter debugging, the quality of automotive moulds can be identified, and the size of the blanks can also be determined. 2. Pre-acceptance of automotive moulds After the mold factory completes the production of all contracted molds within the planned time and passes the self-commissioning, they can apply for pre-acceptance to the development department of the OEM. The mold factory needs to provide the self-inspection report of the automotive mould and the pass rate of the stamped parts. After receiving the pre-acceptance application ...

Oct 10-2020 Views: 638 1. What is the effect of the deep sill (drawing rib) in the cover mold? The effects of the deep drawing threshold (drawing bead) are as follows: 1. Increase the friction resistance of the feed material, so that the surface of the deep drawing part bears sufficient tensile stress, improve the bending stiffness of the deep drawing part and reduce the concave surface, distortion, slack and wave pattern caused by the resilience; 2. Adjust the fluidity of the material to make the fluidity and frictional resistance of each part of the whole drawing process equal, or make the amount of material injected into the mold suitable for each part of the steel part to avoid the situation of "less wrinkles, less cracks"; 3. Expand the scope of adjustment of the hemming force. On the double-action punching machine, adjusting the height of the four corners of the outer guide rail slider only roughly adjusts the hemming force, and it is not possible to control t...