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中型 注塑 机合模 设计

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中型注塑机合模设计,中型,注塑,机合模,设计

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1Design of injection system for injection molding machineSteven.Face.JH.The development and application of Injection molding machine design，Collegeof engineering, Yale University.July 2002At present, an important direction of the development of injection molding machine islightweight, saving resources, saving energy, high efficiency, low use cost. Thereciprocating screw injection molding machine overcomes the problems of the traditionalinjection molding machine, such as the structure is complex, the quality of the material iseven and the efficiency is low, which embodies the characteristics of the high and newtechnology content 1. Application of reciprocating screw injection molding machine,the clamping force is only 1/3 of traditional technology, still high quality assuranceproducts, volume and weight of the machine is greatly reduced, can greatly improve theefficiency of injection molding, ensure the precision of products, as are of greatsignificance in the control of energy saving and products. In recent years, Chineseinjection molding machine industry under the guidance of reform and open, has achievedgreat development, is also the end of the injection molding machine equipment rely onimports of basic time already, which is mainly reflected in the number of injectionmolding machine manufacturers on the production and. Domestic injection moldingmachine production from several thousand to about one hundred thousand units. Fromthe above data, the injection molding machine industry growth rate is far greater than thegrowth rate of GDP, the rapid growth and improve peoples living standards and thedomestic home appliance industry is closely related to the strong driving force of theexport processing industry but also the rapid development of plastic industry growth.From the amount of view, the domestic injection molding machine annual output value oftens of billions of dollars, exports billions of years. The worlds largest manufacturer ofinjection molding machine manufacturers in china. The United States for the productionof large injection molding machine. 2. from the injection machine, the clamping forcein the 1000-5000kN, the injection of 50-2000g in the majority of small and medium-sizedinjection machine. In the late 70s, due to the development of engineering plastics,2especially in the automotive, marine, aerospace, machinery and large householdappliances widely used, so that the rapid development of large injection machine. Themost obvious. In 1980 the United States has more than 140 10000kN clamping forceTodayHot large injection molding machine into the towel field, by the year of 1985 tomore than and 500 units. Japan famous machine company has successfully created theworlds largest injection molding machine, the clamping force of 120000kN, injectionvolume of 92000g.Since 80s, widely used in the CAD/CAE / CAPP / CAM application of computertechnology in machine manufacturing industry, promoted the rapid development of 3 inChina R & D and manufacturing level of injection molding machine. Ningbo HaitianLimited by Share Ltd as the representative of a number of state-level high-techenterprises have been the introduction of computer aided design and analysis software ofAmerican U.G.S company and PTC, realize the three-dimensional parametric modeling,motion simulation and analysis of the main components, the high stress area of stressdistribution and stress peak value, risk area of accurate calculation, help the designers toquickly understand, evaluate and modify the design scheme, ensure the reliability of theimportant parts of the rational structure to achieve the perfect combination of. In order toguarantee the high quality design output to the high quality product output, the oldprocessing way already very difficult to adapt the technology, the quality competitionrequest. The company in the 85 and 95 plan, HotTag in accordance with thescientific method of rolling development, the cumulative investment of 200 million yuanset up processing center branch. Newly built 50 thousand square meters of large assemblyplant, the structure of the processing unit of 100 thousand square meters of gold and thestructure of the new building, a new test workshop and laboratory area of 10 thousandsquare meters, the construction of a new library of three-dimensional automaticwarehouse. The acquisition of the German OKUMA two flexible processing line, addingto the assembly of the more than and 40 processing centers. The implementation of theNational 863 project - Zhejiang Haitian CIMS project, the successful application of the3K3 system, the implementation of production plan, material and cost of computerintegrated management. The introduction of the IMAN system to achieve the creation andtracking of product technical data, product structure and version, product attributes andrelated data query and information transmission to the K3 system, such as computerintegrated management.Injection molding (also referred to as injection molding, injection molding) refers to theraw material for injection (granular or powdered plastic material) cylinder is arranged onthe heating, heating and plasticizing screw or Saishijia column pressure, the melt throughthe nozzle end of the barrel is injected into the mould of the required shape fill the cavityshaped through cooling after the release, with the shape of the product to obtain the 4requirements.The basic requirement of injection molding is plasticizing, injection and forming, inorder to meet the requirements of forming, injection must ensure sufficient pressure andspeed 5. At the same time, due to the high injection pressure, screw axial force will begreat, therefore, the screw design should check the strength necessary; both materialtransfer and screw plasticizing function, so to channel depth of screw structure andreasonable arrangement of different functional sections.Because the molten resin is easy to stagnate in the heating barrel and thermaldecomposition, so to design a reasonable plasticizing device to ensure the molten plasticcan be heated uniformly, at the same time, in order to achieve the injection pressure, musthave reasonable structure design of the nozzle to reduce the pressure loss.The general asynchronous motor is used as the driving device, in order to achieve therequired speed of the task, it is necessary to design a reasonable transmission device andarrange the position of the transmission parts reasonably.In order to accurately control the injection quantity, the metering device should bedesigned, and the automatic control of the measurement can be accomplished by thestroke switch.The plunger type injection device is composed of a quantitative feeding device, a4plasticizing component, an injection cylinder and an injection cylinder.Plunger injection device has the following characteristics:(1) the plasticizing is not uniform, and the capacity of the barrel is restricted. Due toexternal heating heating and melting plastic barrel heat from the plasticizing barrel, andthe poor thermal conductivity of plastics,The reciprocating screw injection device alsocalled screw line type (screw type) injection device is mainly composed of plastic part, ahopper, a screw, a transmission device, a mobile injection injection base, hydrauliccylinder, cylinder injection pressure etc. The plasticizing part and the screw transmissiondevice are arranged on the injection seat, and the injection seat can move along the guiderail of the base by the movable cylinder of the injection seat to make the nozzle evacuateor close to the mould. At the same time, in order to facilitate the disassembly of the screwand the cleaning barrel, a rotating device is arranged in the middle of the base, so that theinjection seat can rotate around a certain angle of the rotating shaft.The reciprocating screw injection device and a hydraulic motor direct drive type,according to the number of injection pressure cylinder is divided into single and doublecylinder type two class structure. For the double cylinder hydraulic motor servo injectiondevice, the screw and hydraulic motor are directly connected to the transmission. Doubleinjection cylinder placed in parallel arranged on both sides of the injection cylinder,hydraulic motor with screw with axial movement, so that the follow-up type. Theinjection device has the advantages of compact structure, low energy consumption, it is aconstant torque when the screw driving device, overload, hydraulic motor to drive, tohave a protective effect on the screw, and the motor driving device is a constant powerdriving device, when the screw is easily broken screw 9 overload. At present, thehydraulic motor directly drives the injection device. plastic movement within the cylinderis in laminar state, close to the cylinder wall caused by high temperature, fast andplasticizing barrel center; plastic plasticizing temperature is low, slow. The larger thediameter of the cylinder, the greater the temperature difference, the more unevenplasticizing, and even the inner plastic has not been plasticized, and the surface of the5plastic has been overheated decomposition of the situation. It is more difficult for heatsensitive plastics processing.(2) large injection pressure loss. Because the injection pressure can not be directlyapplied to the molten material, need not through plasticized plastic transfer molten plasticthrough the slit and the inner wall of the spreader barrel into the nozzle, finally injectedinto the cavity, causing great pressure loss 8. According to the actual measurement, thepressure of the cavity is only 25% 50% of the injection pressure, so it is necessary toincrease the injection pressure.(3) it is not easy to improve the stable process conditions. When the plunger is injected,the material of the feeding area of the feeding cylinder is firstly compressed in advance,and then the pressure is transferred to the molten material after being plasticized, and themolten material of the head is injected into the cavity. Visible, even if the plunger movesat a constant speed, but the filling speed of the melt is the first slow and fast, directlyaffect the flow of molten material in the mold. And the amount of each feeding is notaccurate, the stability of the process conditions and product quality will also have animpact.In addition, the cleaning of the barrel is difficult, but its structure is simple, theinjection volume is still relatively small, the value of its application. As a result, thegeneral is only used in the injection volume of less than 60 7.The utility model is characterized in that the utility model is characterized in that theutility model is composed of two material cylinders, one is a screw pre plastic barrel, andthe other is an injection cylinder, and the connecting points of the two cylinders areprovided with a check valve. Preplasticization pellets through the screw barrel andplasticizing melt through the one-way valve into the injection cylinder 8. When theamount of molten material in the injection cylinder reaches a predetermined amount, thescrew is plasticized to stop, the injection plunger advances and the melt is injected intothe mold cavity. In the process of the rotation, the screw in the plastic cylinder not onlytransports the plastic, but also produces the shear friction heating and stirring mixing.6Therefore, the plasticizing quality and the plasticizing efficiency of the injection deviceare obviously improved compared with the plunger type injection device. In addition, dueto the barrel off shunt shuttle, and enter the injection tube is already so melt, plasticizing,injection pressure loss is greatly reduced, the injection rate is relatively stable, so moreapplication in continuous injection or large injection device.Screw preplasticization injection device solves the plunger type injection devicedefects in the work process, expand the injection volume, decrease the pressure loss at theinjection site, but due to the increase in a barrel, the complex structure of large. Twobarrels of one-way valve easily lead to plastic stagnation and decomposition. At the sametime, in order to avoid the leakage of the melt, the requirements of the injection cylinderand the plunger are relatively high. Therefore, it is difficult to manufacture and use. Inorder to overcome these shortcomings, the structure has been further improved, and thereciprocating screw injection device is produced.The reciprocating screw injection device also called screw line type (screw type)injection device is mainly composed of plastic part, a hopper, a screw, a transmissiondevice, a mobile injection injection base, hydraulic cylinder, cylinder injection pressureetc. The plasticizing part and the screw transmission device are arranged on the injectionseat, and the injection seat can move along the guide rail of the base by the movablecylinder of the injection seat to make the nozzle evacuate or close to the mould. At thesame time, in order to facilitate the disassembly of the screw and the cleaning barrel, arotating device is arranged in the middle of the base, so that the injection seat can rotatearound a certain angle of the rotating shaft.The reciprocating screw injection device and a hydraulic motor direct drive type,according to the number of injection pressure cylinder is divided into single and doublecylinder type two class structure. For the double cylinder hydraulic motor servo injectiondevice, the screw and hydraulic motor are directly connected to the transmission. Doubleinjection cylinder placed in parallel arranged on both sides of the injection cylinder,hydraulic motor with screw with axial movement, so that the follow-up type. The7injection device has the advantages of compact structure, low energy consumption, it is aconstant torque when the screw driving device, overload, hydraulic motor to drive, tohave a protective effect on the screw, and the motor driving device is a constant powerdriving device, when the screw is easily broken screw,overload. At present, the hydraulicmotor directly drives the injection device.Injection molding machine screw is divided into: gradual change screw, mutant screw,universal screw. The gradual change of the depth of the spiral groove is from the depth ofthe spiral groove of the feeding section to the spiral groove. Mainly used for processing awide range of softening temperature, high viscosity non crystalline plastics, such as PVC,etc. The sudden change of the depth of the screw groove from the deep to shallow iscompleted in a short axial distance, which is mainly used to process the viscosity, themelting point of the obvious crystalline plastics, such as polyethylene, polypropylene,etc. The length of the universal screw compression section is between the mutant screwand the gradual change type screw rod, so as to meet the requirements of the melt andnon crystal plastic melt.By comparison, found that graded structure between universal type and mutant, withthe characteristics of both, by adjusting the process conditions to meet the processing ofdifferent plastics, expanded the scope of application, so the selection of screw structure.The structure, form and function of the screw are basically the same as that of theextrusion screw, but there are some differences. Injection screw 。From the injectionmachine, the clamping force in the 1000-5000kN, the injection of 50-2000g in themajority of small and medium-sized injection machine. In the late 70s, due to thedevelopment of engineering plastics, especially in the automotive, marine, aerospace,machinery and large household appliances widely used, so that the rapid development oflarge injection machine. The most obvious. In 1980 the United States has more than 14010000kN clamping force TodayHot large injection molding machine into the towelfield, by the year of 1985 to more than and 500 units. Japan famous machine companyhas successfully created the worlds largest injection molding machine, the clamping8force of 120000kN, injection volume of 92000g. Widely used CAD/CAE / CAPP / CAMapplication of computer technology in plastic manufacturing industry, promote the rapiddevelopment of Chinas injection molding machine R & D and manufacturing level.Ningbo Haitian Limited by Share Ltd as the representative of a number of state-levelhigh-tech enterprises have been the introduction of computer aided design and analysissoftware of American U.G.S company and PTC, realize the three-dimensional parametricmodeling, motion simulation and analysis of the main components, the high stress area ofstress distribution and stress peak value, risk area of accurate calculation, help thedesigners to quickly understand, evaluate and modify the design scheme, ensure thereliability of the important parts of the rational structure to achieve the perfectcombination of. In order to guarantee the high quality design output to the high qualityproduct output, the old processing way already very difficult to adapt the technology, thequality competition request. The company in the 85 and 95 plan, HotTag inaccordance with the scientific method of rolling development, the cumulative investmentof 200 million yuan set up processing center branch. Newly built 50 thousand squaremeters of large assembly plant, the structure of the processing unit of 100 thousandsquare meters of gold and the structure of the new building, a new test workshop andlaboratory area of 10 thousand square meters, the construction of a new library ofthree-dimensional automatic warehouse. The acquisition of the German OKUMA twoflexible processing line, adding to the assembly of the more than and 40 processingcenters. The implementation of the National 863 project - Zhejiang Haitian CIMS project,the successful application of the K3 system, the implementation of production plan,material and cost of computer integrated management. The introduction of the IMANsystem to achieve the creation and tracking of product technical data, product structureand version, product attributes and related data query and information transmission to theK3 system, such as computer integrated management.Injection molding (also referred to as injection molding, injection molding) refers to theraw material for injection (granular or powdered plastic material) cylinder is arranged on9the heating, heating and plasticizing screw or Saishijia column pressure, the melt throughthe nozzle end of the barrel is injected into the mould of the required shape fill the cavityshaped through cooling after the release, with the shape of the product to obtain the 4requirements.The basic requirement of injection molding is plasticizing, injection and forming, in orderto meet the requirements of forming, injection must ensure sufficient pressure and speed5. At the same time, due to the high injection pressure, screw axial force will be great,therefore, the screw design should check the strength necessary; both material transferand screw plasticizing function, so to channel depth of screw structure and reasonablearrangement of different functional sections.Because the molten resin is easy to stagnate in the heating barrel and thermaldecomposition, so to design a reasonable plasticizing device to ensure the molten plasticcan be heated uniformly, at the same time, in order to achieve the injection pressure, musthave reasonable structure design of the nozzle to reduce the pressure loss.The general asynchronous motor is used as the driving device, in order to achieve therequired speed of the task, it is necessary to design a reasonable transmission device andarrange the position of the transmission parts reasonably.In order to accurately control the injection quantity, the metering device should bedesigned, and the automatic control of the measurement can be accomplished by thestroke switch. The plunger type injection device is composed of a quantitative feedingdevice, a plasticizing component, an injection cylinder and an injection cylinder.Plunger injection device has the fol