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Machining molding principle and common injection molding characteristics
by：CSSSLD
2021-01-23
Processing injection molding is the plastic melt in the condition of high pressure will have high speed injection into the mold cavity closure, after cooling stereotypes have exactly the same as that of mold cavity shape plastic products.
processing injection molding must satisfy two necessary conditions: plastic must have been in the molten state into injection mould cavity, the injected plastic melt must have enough pressure and flow rate has been completely full of mold cavity, thus processing injection molding must have plastic plasticizing, the basic function such as melt and pressure injection molding.
plastic plasticizing: in the process of injection molding processing and molding of plasticizing, solid plastic by turning the screw conveyor, constantly move forward along the spiral groove direction, after heating, the compaction, the screw thread of the practice such as shear mixing effect and heat up into a uniform density, viscosity and component and stable distribution uniform flow of plastic melt.
: injection molding process has good plasticizing plastic melt stored in the barrel material stock area, when we do the injection screw axial movement, under the action of screw injection pressure, the plastic melt through the installation has a constant rate in front of the nozzle, barrel mould pouring system and injection mold cavity.
after heating process: injected into the mold cavity injection mould of plastic melt to overcome various flow resistance and full of cavity, cavity of plastic melt by cavity pressure, the pressure has driven the plastic melt flow back to the trend of the barrel, due to the effect of cooling of the cavity caused the plastic melt cooling contraction.
at this point, the injection screw continues to provide pressure, maintain full of plastic melt ininjection mould cavity and not return, and appropriate to supplement the plastic melt in cavity, has fill the cavity contraction of space, until the plastic melt cooling solidification for products.
detail decides success or failure has become a standard, each industry pursues nowadays product precision degree more and more high, the quality requirements more and more strict, this needs in the process of production need to do each link strict control, strict regulation, especially the injection molding products processing industry.
plastic processing products have penetrated into every industry, the plastics to improve the performance of, before making many must be made of metal parts, now completely can be replaced with plastic parts.
but the plastic good natural flow, size is not easy to handle, plastic manufacturing process more difficult than other industries, especially in details, a little do not pay attention to, injection molding processing is easy to appear the pores, off color, the phenomenon such as flash, serious product directly scrap, these common problems in the injection molding process, test the injection engineer directly for the details of the injection molding products processing control are in place.
ordinary processing injection molding are characterized.
accuracy is not high, the size of injection molded parts are typically can be assembled into standard, requirements for the appearance of the injection molded parts is relatively high, when necessary, may use the second processing ( Such as fuel injection) To improve the appearance of defects.
common injection molding don't need to use special precision injection molding machine, also do not need to specially designated materials, general common thermoplastics can be used to production, so the ordinary processing injection molding technology is widely used in modern plastic industry.
processing injection molding if uneven wall thickness of plastic pieces will lead to deformation or shrink, to solve this problem first to advising clients to revise the product best, of course, if you can't change the product, it is only in the transition of thick and thin to C Angle or R Angle transition, this will reduce the stress of plastic flow in question, relieve the stress, the product is not easy to deformation, of course, the thick and thin places not more than 60%, otherwise must thinning or thickening.
processing injection molding must satisfy two necessary conditions: plastic must have been in the molten state into injection mould cavity, the injected plastic melt must have enough pressure and flow rate has been completely full of mold cavity, thus processing injection molding must have plastic plasticizing, the basic function such as melt and pressure injection molding.
plastic plasticizing: in the process of injection molding processing and molding of plasticizing, solid plastic by turning the screw conveyor, constantly move forward along the spiral groove direction, after heating, the compaction, the screw thread of the practice such as shear mixing effect and heat up into a uniform density, viscosity and component and stable distribution uniform flow of plastic melt.
: injection molding process has good plasticizing plastic melt stored in the barrel material stock area, when we do the injection screw axial movement, under the action of screw injection pressure, the plastic melt through the installation has a constant rate in front of the nozzle, barrel mould pouring system and injection mold cavity.
after heating process: injected into the mold cavity injection mould of plastic melt to overcome various flow resistance and full of cavity, cavity of plastic melt by cavity pressure, the pressure has driven the plastic melt flow back to the trend of the barrel, due to the effect of cooling of the cavity caused the plastic melt cooling contraction.
at this point, the injection screw continues to provide pressure, maintain full of plastic melt ininjection mould cavity and not return, and appropriate to supplement the plastic melt in cavity, has fill the cavity contraction of space, until the plastic melt cooling solidification for products.
detail decides success or failure has become a standard, each industry pursues nowadays product precision degree more and more high, the quality requirements more and more strict, this needs in the process of production need to do each link strict control, strict regulation, especially the injection molding products processing industry.
plastic processing products have penetrated into every industry, the plastics to improve the performance of, before making many must be made of metal parts, now completely can be replaced with plastic parts.
but the plastic good natural flow, size is not easy to handle, plastic manufacturing process more difficult than other industries, especially in details, a little do not pay attention to, injection molding processing is easy to appear the pores, off color, the phenomenon such as flash, serious product directly scrap, these common problems in the injection molding process, test the injection engineer directly for the details of the injection molding products processing control are in place.
ordinary processing injection molding are characterized.
accuracy is not high, the size of injection molded parts are typically can be assembled into standard, requirements for the appearance of the injection molded parts is relatively high, when necessary, may use the second processing ( Such as fuel injection) To improve the appearance of defects.
common injection molding don't need to use special precision injection molding machine, also do not need to specially designated materials, general common thermoplastics can be used to production, so the ordinary processing injection molding technology is widely used in modern plastic industry.
processing injection molding if uneven wall thickness of plastic pieces will lead to deformation or shrink, to solve this problem first to advising clients to revise the product best, of course, if you can't change the product, it is only in the transition of thick and thin to C Angle or R Angle transition, this will reduce the stress of plastic flow in question, relieve the stress, the product is not easy to deformation, of course, the thick and thin places not more than 60%, otherwise must thinning or thickening.
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