电器盖注塑模具设计【全套含有CAD图纸三维UG建模】
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English translation in injection moldAbstract: According to the requirements of the plastic products,understand the use of plastic parts, technical requirements, analysis ofdimensional accuracy and other technical considerations of plasticparts, plastic parts size. We used a mold two cavity, the side gate,injection machine uses the Haitian 110X 1A models, equipped with acooling system, CAD and UG drawing two-dimensional assemblydrawing and parts drawing, choose the reasonable processing methodof mould. Attach a statement, the systematic use of a brief text,analysis and calculation of plastic parts and concise, so as to makereasonable mold design.Key Words ： Mechanical design; mold design; CAD UG to drawthe 3D drawing two-dimensional map.1、IntroductionMany types of mold, the structure and varieties of plastic, plasticinjection molding machine and the complexity of the types and otherfactors, its basic structure is composed of the movable mould and thefixed mould is composed of two parts. The fixed mould part arrangedon the fixing plate of the machine, dynamic part is installed in themobile injection molding machine, in the injection molding processwith the clamping system of injection molding machines movement.Part of mold and die part guided by a guide post and a closeddynamic injection molding. General injection molding parts, theclamping mechanism, gating system, side parting and core pullingmechanism, pushing mechanism, a heating and cooling system,exhaust system and the supporting parts.At present, the mould manufacturing technology in China hasbeen from the past can only make simple mold to mold can producelarge, sophisticated, complex, long life. In the plastic mold design andmanufacturing, to bumper and the whole panel of large injectionmold. With the rapid development of computer technology, the molddesign and manufacturing technology is moving in the direction ofthe development of digital. On the one hand, the domestic marketwill continue to mold growth; on the other hand, mold manufacturingis gradually transferred to China and the multinational corporations toChinas purchases tend to die is also very obvious. Chinas economy isstill in a stage of rapid development, the international developmenttrend of economic globalization is increasingly obvious, whichprovides good conditions and opportunities for the rapiddevelopment of mold industry in our country.2、 Mold-Filling Simulation2.1 Calculation of the interface locationsThe mold filling velocity and the shape of the melt front in LFCare quite different from those in the conventional empty moldcasting The velocity at the melt front is restricted by the foamdegradation ， gas elimination ， pressure building-up in themold ， etc ， and 1t is affected by the original processparameters，such as the vacuum degree，the pattern density and themetallic static head The meltpattern interface develops in aradiate mannerDue to the foam degradation caused by the heattransfer between the molten metal and the foam pattern in LFCTheinfluence of the gravity on the mold filling velocity and the interfacemorphology in LFC is minor compared with that in the conventionalempty mold gravity casting5 7 According to the mechanism ofthe melt frontmovement during the mold filling process of LFCthe artificialneural network technique is proposed to calculate the locations of themeltpattern interfaceThe whole casting(including the gating and feeding system) ismeshed into the cubic cells of appropriate sizeEach cell is regardedas a neuron and can be in one of three states during the mold filling,empty, interfacial or ful1. A neural network is formed through theinterconnecting links between the cells ， in which each cell isconnected only to its neighboring cells and has no connections to theothers The architecture of the network is similar to the cellularneural network(CNN)in the way of cell connecting ， I,E, with locallyinterconnectinglinkage and pre-designed link values(weights)According to themode of linkage ， each cell except for the cell located at theboundary of the casting is connected to its 26 neighboring cellsLet C(i，j，k)denote a cell and Nr(i，j, k)the aggregation of ceilsconnected to C(i，j，k)，then：From the initial time t0，each cell of the network changes itsstate of activation at the end of every time interval t according to itsactivation function an d produces an output value of 1 or 0For atime intervaleach cell accepts the outputs from the 26 neighboringcells as its inputUsing a 26-dimeusional vector to denote the inputof C(i，j ，k)，the components of the vector are：in which， is the output of C(l，m，n)and represents the distanceof interface movement from C(l，m，n)to the un-filled cell C(i，j，k)inthe time interval of At with unit velocityThe summed input of the un-filled cell c(i，J，k)is：where， is the input function and represents the 26_dimensionalweight vectorEach component of the weight vector is set accordingto the velocities of the neighboring cell and their relative ofnationsthat is：where ， denotes the relative orientation to the neighboringcells，and ， is the evaporating velocity of the foam pattern at thecorresponding locationFrom the related experimental study it hasbeen found that is determined by the process parameters of themetallic static head h ，the vacuum degree ，the pattern densityd，the pouring temperature and the factor of coating property Forthis specially designed network，the operation 0f the input functionis to calculate the relative interface moving distances from theneighboring cells to cell C(i,j,k).The detailed calculation process is asfollows:(1)By multiplying the corresponding components of the inputvector and weight vector ， a new 26-dimensional vector isobtained，and the accumulation of the components of the new vectorwith time is：And ，when C(i，J，k )is empty(2)By summing the two components of vector ，m，along whichthe filling directions confront with each other ， a 13-dimensionalvector is obtained： Let then，the states of activation of the cells are defined as:when ，k=0，C(i，j，k )is an empty cell；when ，j， 0，C(i，j，k )is a full cell；when ， 0，C(i，j，k)is an interface cel1The output of the neuron is a threshold function：where is the threshold value of the neuron and it equals tothe side length of the meshed cel1 Fig1 Flow chart of LFC mold filling solution procedureThe algorithm was realized by C+ computing language，as itscomputation flow chart shown in Fig1、At the beginning of thecalculationThe cells in the top layer of the meshed sprue of castingwere set to be fu11 (if the sprue was hollow，all the cells betweenthe top layer of sprue and the ingate were set to be ful1)Accordingto the calculation process，all the cells would be full after filling for acertain time, and the system would be stable.2.2 Calculation on the fluid flow and temperature distributionduring mold fillingAccording to the above solution algorithm，the locations of meltpattern interface at any moment are obtained So the fluid flowand the temperature distribution during the mold filling can becalculated by solving the NS equation and the energy equationwithin the known computational domainThe governing equations are expressed as the followinggeneral form ：where is a dependent variable，represents the diffusion coefficient and S is the source termThe equation represents the continuity equation，the NS equation or the energy equation，when the dependent variable is 1，uj, or T，respectivelyFor a certain ，there are corresponding and SSOLA technique was applied to calculate the fluid flow in the NS equation The velocity boundary condition at the meltpatterninterface in LFC is different from that at the free surface in theconventional empty mold castingIn the lost foam casting ，the meltfront velocity is restricted by the evaporating velocity of the foampatternSo the melt front velocity could be set as the evaporatingvelocity of the foam pattern ， and the direction is determinedaccording to the relative orientation between the molten metal andthe foam patternFor a full cell C(i，j，k )，for example，if theoutput value， is 0，then the boundary velocity can be set as : The temperature boundary condition at the melt front in LFC isalso quite different from that in the conventional empty moldcastingIn the lost foam casting，the melt front is remarkably chilleddue to the evaporation an d the decomposition of the foampattern Generally ,so me researchers used an equivalent heattransfer coefficient to deal with the chilling effect In this paper ,theboundary condition is treated by giving the relationship between theheat flow an d the time at the interface3、Check the stiffness and strength of dieDie strength of common sense in mold strength, stiffness.Requirements of various molding parts and components have thestrength, the stiffness of the die, enough strength can ensure moldcan work normally.Because the mold form is more, the calculation is different andmore complex, in actual production, using the method of experiencedesign and strength check of the combination of the strength check,adjust the design, to ensure the normal work of the mould can be.Die strength calculation is relatively complex, generally use thesimplified calculation method, to take a conservative approach, thecalculation principle is: select the most unfavorable loading structure,selection of safety coefficient, and then optimizing the structure ofthe mold, improve the mold strength. In order to ensure that themold can work normally, the overall strength is not only to check themold, to check the strength of the local structure of die.The overall strength of the main for the cavity wall thickness,cavity thickness of base plate, several pressure mold surface can bear,the actual choice of size should be larger than the size and integralcalculation. Check the strength and bending from the two aspects ofcalculation, select a larger size.4、Design and calculation of cooling systemMold temperature have influence on the mold filling of plasticmelt flow, solidification, the production efficiency and the productsshape and size precision, for any plastic products, mold temperaturefluctuation is negative. The mold temperature is too high will makethe plastic deformation occurs in the release, to extend the coolingtime and make the productivity decline. Mold temperature too lowwill reduce the flow of plastic, making it difficult to filling, increasedstress products and obvious weld marks. Due to the requirements ofperformance and process all kinds of plastic, the mold temperaturerequirements are not the same. Plastic powder injection to thegeneral mold temperature, melt solidified into the plastic parts,reduce the mold, mold temperature from the left and right aredependent on the cooling water inlet in the mold, the heat away. Forthe requirement of low temperature (less than) plastic, only need toset up the cooling system can be, because can be adjusted by theflow of water to adjust the mould temperature5、ConclusionsThe mold design project, through the analysis of plastic parts ofthe process, determine the overall design of the mold, and the designof each subsystem. The design of the mould can meet the qualityrequirements of the working state, the use of safe and reliable, easyto repair, a molding cycle is short in injection molding, forming a longservice life, reasonable mould manufacturing process.Through the above work, I on a mold from design to the wholeprocess of knowledge are clear and intuitive, understanding theworking principle of injection mold, with the experience andknowledge will determine the design and accuracy of the main partsof the die cavity and so on, can be a reasonable solution to theproblems in the design of the mould often appear the proposed, toselect the injection molding machine, mold, determine the structureand size of the cavity number, the choice of parting surface, gatingsystem design, core pulling mechanism etc. Due to the lack ofknowledge and experience, in the design process to determine themachining accuracy of parts, there are still many shortcomings, stillneed to be improved in the future work, study.References1 Chen Xiaokang, Zhou Xinglong. Practical Mould TechnologyHandbook M. Beijing: China Light Industry Press, 20012 Peng J
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