Do you know how to design a plastic part embedded in a nut If: there is no problem in the selection of plastic and nut, the standard state of the nut after being embedded in the plastic is shown in Figure (I)If: the nut size is too small, the plastic BOSS hole is too large, […]
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Program control of injection speed The program control of the injection speed is to divide the injection stroke of the screw into 3 to 4 stages, and use the appropriate injection speed in each stage. For example: slow down the injection speed when the molten plastic first passes through the gate, use high-speed injection during
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PE is a crystalline raw material with very little hygroscopicity, no more than 0.01%, so there is no need for drying before processing. PE molecular chains have good flexibility, small forces between bonds, low melt viscosity, and excellent fluidity. Therefore, thin-walled long-flow products can be formed without too high pressure during molding. The shrinkage range
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The working conditions of plastic molds are different from those of cold stamping dies. They generally have to work at 150 degrees Celsius to 200 degrees Celsius. In addition to being subject to a certain pressure, they also have to withstand the influence of temperature. According to the different usage conditions and processing methods of
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Pre-molding action selection Depending on whether the injection seat retreats before and after pre-plastic feeding, that is, whether the nozzle leaves the mold, the injection molding machine generally has three options: Fixed feeding: the nozzle is always attached to the mold before and after pre-molding, and the injection seat does not move. Front feeding: The
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Two-color injection molding technology is also called double-material injection molding technology. This is a technology that uses two plastic materials to be mixed and injection molded to form plastic products. Its technical connotation is actually to use a mold component to shape the shape and mold it in the mold. Welding work, so the basic
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When the mold temperature is not high, resins whose material fluidity deteriorates significantly, such as polycarbonate PC, polyphenylene ether PPO, polyethylene terephthalate, commonly known as polyester resin PETP, etc., require the mold temperature to be heated to 80 degree or above (use a mold temperature regulator).
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Plastic gear parts injection molding process and material analysis. Plastic gears are developing toward larger sizes, more complex geometries, and higher strength, with high-performance resins and long-glass fiber-filled composites playing an important role. Plastic gears have experienced a change from new materials to important industrial materials in the past 50 years. Today they have penetrated
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In order to strengthen the hardness of the metal surface, many manufacturers will use the quenching process to promote the production of moulds, and the cracks generated after the quenching of the moulds are a defect in the heat treatment process *, which is likely to cause the processed moulds to be scrapped. What are
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Not enough (lack of glue) Process problems: plasticizing temperature is too low, nozzle temperature is too low, injection time is too short, injection speed is too slow, mold temperature is too low. Mold problems: the runner is too small, the gate is too small, the gate position is unreasonable, the exhaust is poor, and there
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Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of the injection molding method are fast production speed and high efficiency, the operation can be automated, there are many designs and colors, the shapes can be from simple to complex, and the sizes can be from
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Solutions to bubbles appearing during injection molding Causes and solutions of bubbles When the wall thickness of the product is large, the outer surface cools faster than the central part. Therefore, as the cooling proceeds, the plastic resin in the central part shrinks and expands toward the surface, causing insufficient filling of the central part.
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