【正文】 計算，并考慮經(jīng)濟性，選用后側(cè)導柱模架。通常，把沖件或廢料從凸模上卸下稱為卸料，把沖件或廢料從凹模中卸下稱為出件。故采用彈性卸料裝置。中小型模具一般都是通過模柄與壓力機的滑塊相連接。壓入式模柄，主要用于上模座較厚而又沒有開設推板孔或上模具比較重合的場合。再根據(jù)壓力機滑塊上模柄孔的尺寸確定模柄的尺寸規(guī)格，一般來說模柄直徑應與模柄孔直徑相等，模柄長度應比模柄孔深度小510mm。螺釘和銷釘和銷釘都是標準件。銷釘常用圓柱銷。（2）螺釘規(guī)格按下表選用表51螺釘規(guī)格的選用凹模厚度mm螺釘規(guī)格凹模厚度mm螺釘規(guī)格 凹模厚度mm螺釘規(guī)格≤13MM51925MM832MM121319MM62532MM10（3） 各被聯(lián)接件的銷孔應配合加工，以保證精度出件裝置的作用是從凹模內(nèi)卸下沖件或廢料。（1） 剛性裝置利用壓力機滑塊上的打料機構來完成推件工作。（2） 彈性推件裝置利用安裝在上模內(nèi)的彈性元件的彈力來給推件塊一個力，彈性元件多采用彈簧和橡膠。彈性推件裝置主要適用于板料較薄且平直度要求較高的沖件。裝在上模內(nèi)的出件裝置稱為推件裝置，裝在下模內(nèi)的稱為頂件裝置。頂件裝置一般是彈性的。頂件塊與凸凹模的配合（1）沖裁件的內(nèi)形尺寸較小、外形尺寸較簡單時，頂件塊外形與凹模之間采用間隙配合H8/f8，頂件塊內(nèi)孔與凸模采用非配合工序（外導向）。 定位零件的選用 定位零件的作用是使坯料或工序件在模具上相對凸、凹模有正確的位置。擋料銷的選擇 擋料銷主要用于定位，保證條料有準確的送料步距。（1）固定擋料銷 固定擋料銷一般固定的位于下模的凹模上，設計時要注意凹模壁的強度。 凸模、凹模、凸凹模、彎曲模設計 凸模凸模的形式一般有兩種：直通式凸模和臺階式凸模。這種凸模可以采用成型磨削、線切割等方法進行加工，加工容易，但固定板型孔的加工比較復雜。2）臺階式凸模臺階式凸模，其工作部分與固定部分的形狀與尺寸不同。工作部分可采用車削、磨削或仿形銑加工，最后用鉗工精修，加工較困難，但精度較高。由以上分析可知對于該復合模具的沖壓凸模采用臺直通凸模結構。該凸模采用彈性卸料，凸模長度可按下式計算： 61式中 L—凸模長度，mm； h1—凸模固定板厚度，mm； h2—卸料板厚度，mm； h4—彈性元件被預壓后的厚度，mm；沖裁凹模的刃口形式有直筒形和錐形兩種，選用時主要根據(jù)沖件的形狀、厚度、尺寸精度及模具的具體結構形式來確定。故沖件精度較高，刃口強度也較好。沖裁時，工件易在孔內(nèi)積聚，嚴重時使凹模脹裂。適用于中小型薄料沖裁。繪制了CAD總裝配圖1張、零件圖8張，順利完成了復合模具的設計，在設計過程中主要完成了以下任務：（1） 了解模具在生產(chǎn)中的地位并了解模具未來發(fā)展方向；（2） 掌握彎曲變形過程和彎曲變形特征；（3） 零件沖壓工藝分析；（4） 確定落料方案并進行必要的分析計算；（5） 完成模具各部件設計（6） 繪制零件圖和復合模具裝配圖通過本次設計我受益良多，掌握了模具設計的基本方法和步驟。 課題展望 模具是現(xiàn)代工業(yè)生產(chǎn)中使用極為廣泛的工藝裝備。用模具生產(chǎn)制件所表現(xiàn)出來的高精度、高復雜程度、高一致性、高生產(chǎn)率和低消耗，是其他加工制造方法所不能比擬的。因此模具在很大程度上決定企業(yè)在市場競爭中的應變能力，模具成型己成為現(xiàn)代工業(yè)生產(chǎn)的重要手段和工藝發(fā)展方向。由此可以看出模具的發(fā)展空間還很大，需要更多從事模具行業(yè)的人們加倍的努力，為模具的發(fā)展貢獻力量。論文的完成也就意味著大學生涯的結束。首先，我要感謝尊敬的雷聲指導老師，從論文的選題到論文的完成，雷聲老師都給與悉心的指導。雷聲老師的悉心輔導使我在畢業(yè)論文中少走了許多彎路，順利完成設計任務。雷老師嚴謹?shù)慕虒W態(tài)度和淵博的知識使我受益匪淺。附錄附錄一：英文科技文獻翻譯英文全文8. Modeling of a Heating Operation with Transformation.. Creating a New ProblemCreate a directory called Transform, change to that directory. Change theProblem ID to Transform. Click on the PreProcessor button and enter the PreProcessor to define your simulation data.. Loading the Material PropertiesGo to the File option in the menu bar and load in the keyword file,. This will provide you with all the material properties for the next three labs.. Setting Simulation ControlsClick on the Simulation Control icon in the Controls window. Set the following parameters:1) Change the Operation Name to Heating.2) Change the units to SI.3) Change the object geometry to Plane Strain4) Turn on Deformation, Transformation and Heat Transfer.5) Click on the Stopping Steps controls button and change the number of steps to 2000.6) The step increment to save should be set to 10.7) The PDIE(1) value should be set to 1.8) Stepping should be performed by Time (DTMAX) and a rate of 2 seconds per step.9) Click on the Stopping Controls Tab.10) TMAX should be set to 3600 seconds.11) Click on the Step Controls Tab.12) Now click on the Advanced Step Controls… to modify the stepping criteria of the simulation. Change the temperature change per step to 5 C and the Temperature change time step to a range of 2 s and 20 s.13) The Step Definition should be changed to “temperature based” by selecting the Temp option in the radio button.14) Press Ok in the Advanced Step Controls window, press Ok in the Stopping and Step Controls window.15) Click on the Processing Conditions button in the Simulations Controlswindow and set the Environment temperature to 850 C.16) Set the value of the Convection Coefficient to N/(s*mm*C).17) Press Ok in the Processing Conditions window and press Ok in theSimulation Controls window.Question: What is “temperature based” stepping?This is a method by which the time step size is determined by using thecalculated temperature gradient from the previous step to estimate a user defined maximum temperature change. The parameters that need to be set are the desired maximum temperature change, the largest allowable time step size and the smallest allowable time step size. Also, the Step Definition needs to bechanged to Temp in order that the first step of the simulation DTMAX iscalculated while the rest of steps are determined from the temperature field.. Creating New ObjectsObject 1:At this point, the user will insert all the objects required for thissimulation.1) Click on the Objects button in the Control window.We need to load the work piece geometry and create a mesh for it.2) Change the Object name to Gear Tooth.3) Click on the Geometry button in the Objects window and load theIGES file .4) After the gear tooth has been loaded reverse the geometry to make itcounterclockwise.5) Click on the Check Geometry button to ensure that the geometry islegal.6) Click Ok in the Geometry window.7) After this, click on the Mesh icon in the Objects window.Set the number of mesh elements to 500 and adjust the weighting factor for the meshing such that boundary curvature has a weighting factor of 1 while leaving the other weighting factors unchanged. Set the number of thickness elements 4 and the maximum size ratio between elements 3.8) Generate the mesh for the gear tooth and press Ok.9) Set the Material type ElasticPlastic.10) Click on the Boundary Conditions icon and set the vertical velocityto zero for the bottom section. (Figure ).11) Click on the thermal tab in the Boundary Conditions window to setthe heat exchange boundary conditions (Figure ).12) Set