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厚板定位塊精沖工藝及模具設(shè)計-預覽頁

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【正文】 半圈槽做排氣孔用,以便于沖裁時模具內(nèi)的氣體的排除,避免影響沖裁。為了防止擠走潤滑劑,在齒圈壓板的送料方向適當減小厚度。如圖316中,帶“*”的尺寸與凹模配做,帶“△”的尺寸按凸模配作。且閉鎖銷與銷孔采取配合加工,使間隙小于凸模和凹模之間的間隙,用以提高上、下模對中的精度。沖裁過程中產(chǎn)生大量的熱,必須把這部分熱散發(fā)出去,否則,將影響模具的壽命,故在模具設(shè)計時在上模座上挖了一個通氣孔(如圖318),以便在沖裁時通入冷卻空氣,以降低模具刃口溫度,提高模具壽命。齒圈壓板是精沖模的特殊受力件;頂件器不僅起壓緊材料的作用,而且起導向作用,既是受力件,也是導向件。零件間配合和尺寸要求如圖319為固定凸模式模具的上模和下模各零件間的配合和相關(guān)尺寸要求。研究的主要工作有:(1) 論述了厚板精沖的機理,分析了精沖在小間隙和三向壓力作用下變形模式、變形特點、剪切變形區(qū)應(yīng)力和溫度特點。(3) 在工藝分析和模具設(shè)計過程中得出了一些改善厚板精沖的措施,如下:1) 采用比薄板精沖更小的相對間隙,以提高靜水壓力;2) 刃口倒圓,減小厚板剪切面的變形程度,消除材料的撕裂;3) 采用雙面尺圈,增加壓邊效果;4) 設(shè)計了排氣、冷卻、潤滑裝置,以改善模具的工作狀況,提高模具壽命;5) 工作零件采取了比普沖要求更高的熱處理要求措施,提高耐磨性能;6) 用高強度、大剛度、滾動精導向模架,解決厚板導致的模架變形和導向問題。參考文獻[1] 涂光祺. 精沖技術(shù). 北京:機械工業(yè)出版社. 2005[2] 周開華. 簡明精沖手冊. 北京:國防工業(yè)出版社. 2005[3] 《鍛造與沖壓》期刊有關(guān)內(nèi)容. [4] 涂光祺. 沖模技術(shù). 北京:機械工業(yè)出版社. 2005[5] :[6] [7] JIA Jianjun,PENG Ying—hong,RUAN Xue yu.The FEM simulation of fine blanking ductile fracture [J].Journal of Shanghai Jlaotong University.2003,37(7):1064—1067附錄附錄A:英文翻譯(譯文)在dynaformPC的會議, 選項列表的圖標,將用戶提供了可供選擇的內(nèi)容涉及目前指揮甄選. 這些圖標顯示在屏幕左側(cè)以上提示窗口. 以確定它的功能的圖標,把鼠標的圖標. 工具冰山將提供一個標簽的圖標,顯示其功能. 點擊右鼠標按鈕下拉菜單也存取同一功能. 圖標所示是一個例子,這個功能. 控制窗口包含兩個選擇卡:預流程及工具. 挑選顯示卡的圖標代表不同的功能. 功能描述中強調(diào),當光標置于個人圖標. 點擊選項標簽,把一張卡給另一方. 前遴選過程卡的所有功能,為了展現(xiàn)幾何學大廈. 下拉菜單內(nèi)卡允許用戶選擇其中的四個選項幾何 建筑:直線/點,面,元素和節(jié)點. 一旦用戶選擇的方案之一,相應(yīng)的功能展示在卡. 職能每張卡有充分的討論,在第4,5,6月7日和9. DYNAFORMPC的許多功能通過鼠標左鍵可以實現(xiàn)。 用戶可以選擇一個、兩個或者三個點/節(jié)點來新建一個坐標系。V軸在平面UV里確定并與U軸垂直。U 軸由右手定則確定。1. DYNAFORM PC 提示:定義一個局部坐標系選擇一個點作為原點2. 坐標原點確定后,程序提示:選擇下一點 3. 坐標系統(tǒng)確定后,程序?qū)崾居脩艚邮?拒絕展示的坐標系統(tǒng)。 規(guī)格DYNAFORM PC機的標準版本每一數(shù)據(jù)庫都有如下限定: 150,000 線450,000 點4,000 曲面350,000 邊緣點(曲面)160,000 邊界線(曲面)250,000 單元 節(jié)點1,000 屬性1,000 PIDS 第二章 開始使用 開始使用 PC程序并啟動它。 創(chuàng)建一個DYNAFORM PC機數(shù)據(jù)庫文件 1. 從文件菜單選擇新文件,以及在DYNAFORMPC上演示創(chuàng)建一個數(shù)據(jù)庫文件的窗口如下圖所示。請看。 注意:DRAW TYPE 的選擇應(yīng)該與那些用來生產(chǎn)真實工件的機器類型有關(guān),這聯(lián)系穿孔器的指示移動和裝訂工人裝。 讀取幾何數(shù)據(jù)用戶在DYNAFORMPC 里打開文件時有幾種選擇。這將會打開DYNAFORMPC(如果不能打開)和自動載入文件。 打開一個數(shù)據(jù)庫文件查找允許用戶在打開/保存文件時瀏覽目錄?!皵?shù)據(jù)庫打開窗口”只顯示那些與當前文件擴展名相符的“文件類型”。 文件管理每個功能的詳細描述將在接下來的章節(jié)里給出。沒有其它的類型。s workdirectory. SPECIFICATIONSThe standard version of DYNAFORMPC has the following specifications per database:150,000 LINES450,000 POINTS4,000 SURFACES350,000 Edge Points (SURFACE)160,000 Control Points (SURFACE)250,000 GRIDS250,000 LEMENTS1,000 PROPERTIES1,000 PIDSCHAPTER 2GETTING STARTED GETTING STARTED1. Select the DYNAFORMPC program in the PC window to activate it. Please seeFigure .Figure Getting Started2. Once the program is activated, it automatically displays the OPEN ADATABASE FILE window.3. The user supplies CADIGES data and VDA data that will be translated and readdirectly into DYNAFORMPC.4. CAD or model data is not supplied. Therefore, the user begins with an emptydatabase and generates or “digitizes” line data into the drawing. CREATE A DYNAFORM PC DATABASE FILE1. Select NEW from the FILE MENU and DYNAFORMPC displays the CREATEA DATABASE FILE window shown below. The default FILES OF TYPE isDynaform Database (*.df). There is no alternative type. The user may type in anyfilename they choose and select OPEN to create the database file. Please seeFigure .Figure Create a Database File2. Once the database file is created, DYNAFORMPC displays the ANALYSISSETUP menu as Figure .Figure Analysis Setup3. Select a unit type from the UNIT pulldown menu.4. Select a draw type from the DRAW TYPE pulldown menu. Note: Draw Type Option should relate to the type of machine used to produce the true work piece, which associates the directions of punch moving and binder loading. If you are not sure or face a new process, the user may select User Defined item. Refer to the DYNAFORMPC Application Manual for description of draw type.5. After the other items in the menu have been considered, select OK. READING GEOMETRY DATAThe user has several options when opening a file in DYNAFORMPC. One of the ways thefile can be opened is by dragging and dropping the desired file into the DYNAFORMPCprogram window or shortcut icon. DYNAFORMPC will automatically open the file if theextension is recognized and prompts the user for key parameters. The user can also doubleclick on files with extensions that DYNAFORMPC recognizes. This will openDYNAFORMPC (if unopened) and automatically load the file. The third choice is to openthe desired file via the OPEN mand in the FILE MENU. This will display the OPEN ADATABASE FILE window, which also opens automatically at the start of the program. This window controls the input and output of data in DYNAFORMPC. Please see Figure Figure Open a Database FileLOOK INAllows the user to navigate directories when opening/saving files.FILE NAMEAllows the user to specify the name of the file to open/save.FILES OF TYPEAllows the user to specify the type of file to open/save. The available file types aredisplayed in the scrolldown window. The OPEN DATABASE WINDOW onlydisplays the files that match the current FILES OF TYPE extension.If the user accidentally enters the wrong extension, DYNAFORMPC will open anotherwindow asking for the file type. Once the correct file type is selected, DYNAFORMPCopens the file.CHAPTER 3FILEThe functions in the FILE menu are shown in Figure .Figure File Manager A detailed description of each function is given in the following sections. NEWThis function allows the user to create a new database file. Please see Figure .Figure New a Database1
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