Connector injection molding production problem causes and solutions

1. The main cause of the depression phenomenon: the design of a large gate first solidification can not be spread over the region and shrinkage; should be appropriate selection of materials to reduce the thickness of the meat, the gate size to increase to facilitate the plastic filling, gate design in the thickness of the meat of a slightly larger area; molding conditions are not set properly (pressure measurement); should be pressurized to increase the pressure and time (can not be overdone); product design is not appropriate to form a serious depression; should be an average of the thickness of the meat needs to be made up for the need for the thickness of the strong need to be less than the wall thickness. 2. The cause of poor luster: mold damage or grinding is not good; should be mirror processing chrome or titanium sandpaper grinding; material temperature or mold temperature is too low; should be selected to use the appropriate material temperature and mold temperature to improve the gloss. 3. The cause of scorching: exhaust bad plastic gas content is too much; should be to reduce the injection speed for gas discharge time, split the mold nut to increase the exhaust slot, two-stage clamping first low-pressure exhaust and then high-pressure clamping. 4. The cause of the mixing of colors: Product injection friction with static adsorption of dust; should be installed in the basket to remove static installation; processing oil pollution is not clean machine environmental pollution; the mold oil stains clean, the environment to adhere to the clean and machine cleaning; plastic drying plus secondary material crushed mixed; attention to the machine and the surrounding as much as possible to use more with the same color of the plastic. 5. Mold deformation of the causes: corepine is too long, the strength of the lack of; products should be designed to prevent the mold kernel aspect ratio The cause of deformation of mold kernel: corepine is too long, lack of strength; product should be designed to prevent mold kernel length to width ratio is greater than 5; metering holding pressure is too large; should be adjusted according to the product ejection conditions; due to the formation of bends in the glue line; glue line should be moved to the area of the strength of the increase in the cold well. 6. The cause of the glue line: formed by the multi-point into the plastic of the glue line or can not be prevented; in the region of the glue line to increase the thickness of the temperature or pressure, move the sprue gate to move the glue line with the unimportant area, add overflow wells to alleviate the phenomenon of glue. 7. The cause of the mold release: product / mold design is not appropriate, the front end of the injection pressure is too large is not easy to eject; add meat thickness to lower the injection pressure, gate plus thimble; ejector system is not balanced, resulting in the top through the sticking mold; should be considered as a whole configuration, the material depth of the area needs to be with the two sides of the installation of the thimble; mold line is not properly designed to stick to the mother mold, can not be demolded; should be the product of large parts of the design and the male mold; mold kernel damage or the grouping does not amount to the formation of the hairy head generated! Affect the mold release; should check and correct the mold; mold text formed by the dead angle, forming the mold release is not easy; grinding and polishing, set the thimble, design to prevent the direction of the mold release; ejector rolls can not be smooth, the thimble broken; thimble assembly should not be sloppy "quit the rush to endure". 8. the cause of the phenomenon of short-shot: the product is uneven meat thickness, forming the thin area of the activity is abnormal, in severe cases, short-shot; short-shot phenomenon of the cause: product meat thickness, forming the thin area of the activity is abnormal; in severe cases, short-shot is formed. Short shot, when the formation of serious short shot; design to try to average the meat thickness; multi-mold hole in the hole activity is not balanced; balanced runner design, the application of mold flow analysis to calculate the size; injection line specifications do not match; according to the size of the product estimation of the machine; the lack of plastic mobility; adjust the temperature and injection pressure to improve the (material change); short shot of bad exhaust; increase the opening of the exhaust groove, reduce the speed of injection. 9. Warp deformation of the reasons: product meat thickness is not even to form a large difference in shrinkage; the thimble assembly should not be sloppy "quit hurrying to endure". The formation of shrinkage difference is very large; average meat thickness, activity balance, reduce injection pressure; product meat thickness is too thin or activity length is too long, resulting in difficult activities and residual stress is too large; the design of thinking about the molding properties (such as / T ratio); mold cooling system design is not appropriate, the temperature difference between the male and female molds is large, the contraction of the two sides of the formation of different warping; cooling configuration design should be, the parameter control (temperature / flow rate); the top of the location of the unbalanced. On the release of difficult products in the ejection after the formation of deformation; ejection balanced, gate and holding area and the area of the thimble. 10. the reason for the hairy head: product / mold design is not appropriate, resulting in injection pressure is too high, the machine clamping force is not enough to form molds can not be close to produce the hairy head; increase the thickness of the meat / average thickness of the meat, careful selection of plastics / L T than the advancement of the speed machine / low-pressure, high-speed; mold strength is not enough to shoot deformation, mold can not close, high temperature mold is more than the L T ratio; mold strength is not enough, injection deformation, the mold can not close, high temperature mold. Mold can not be close, high temperature mold is more likely to attack; calculated pressure to design the mold size, increase the mold reinforcement design, such as auxiliary columns, the use of low shrinkage and high strength steel; plastic mobility, but the solidification of slow, small gaps can also produce hair; mold precision request higher, reduce the temperature of the plastic mold, reduce molding injection pressure.

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