【正文】
4 由上表查得:由《現(xiàn)代模具設(shè)計》 40p 的表:沖模合理雙面間隙值 Z 查得: 間隙范圍為 9%~ 12%t,則 mmZ ? , mmZ ? 。 計算卸料力 落F =K 卸 落F =? 350KN=( KN) (42) 式中: K 卸 —— 卸料力因數(shù),其值由《中國模具設(shè)計大典》表 查得 K 卸 = 計算推件力 推件力: F 推 =nK 推 F 沖 =1 ? ? ≈ (43) 式中: K推 —— 推件力因數(shù),由《中國模具設(shè)計 大典》表 K 推 = n—— 卡在凹模內(nèi)的工件數(shù)取 n=1 第一次拉深工序 按照 圓筒件的拉深 公式計算得拉深力為: F=π d1t? bK=? 145? ? 392? =249KN (44) 濟(jì)南大學(xué)畢業(yè)設(shè)計 參考文獻(xiàn) 15 推卸落壓邊拉伸 FFFFF ???? 壓邊力 (45) 式中 的值按相應(yīng)表選取為 該工序的總沖壓力 F 總 = (46) =249++360++= 壓力中心的確定 模具壓力中心是指沖壓時諸沖壓力合力的作用點位置。 拉伸次數(shù)的確定 第一次拉伸:計算工件 的 dt/d,h/d,t/D 100%和總拉伸次數(shù) m1 相對凸緣尺尺寸: df/d1=148/= ( 32) 相對對高度: h/d=60/= (33) 相對厚度: t/D 100%=(34) 拉伸系數(shù): m=145/252= ( 35) 第二次拉伸:計算工件的 dt/d,h/d,t/D 100%和總拉伸次數(shù) m2 相對凸緣尺寸 dt/d2=148/122= (36) 相對高度: h/d=75/122= (37) 相對厚度: 100%= ( 38) 拉伸系數(shù): d2/d1=122/= (39) 第三次拉伸:計算工件的 dt/d,h/d,t/D 100%和總拉伸次數(shù) m3 相對凸緣尺寸 dt/d3=148/97= (310) 相對高度 h/d=108/97= (311) 相對厚度 100%= 7 ( 312) 拉伸系數(shù): d3/d2=/97/118= (313) 表 3— 1凸緣筒形件第一次拉深時拉深系數(shù) 凸緣的相對直徑 ddf 毛坯相對厚度 100?Dt ~ ~ ~ ~ 〉 ~ ~ ~ ~ ~ 濟(jì)南大學(xué)畢業(yè)設(shè)計 參考文獻(xiàn) 11 119 0 .0 9 59 1 .5 hhdd? ? ? ??dh ??dhddf ???dh~ ~ ~ 表 3— 2 凸緣筒形件第一次拉深時極限相 對高度 mm[10] 由上面兩個表格 ,可以查得 : 第一次拉深: ?m 第二次拉深: 75..02 ?m 第三次拉伸: ?m 與前面的計算相比較 : 第一次拉深 (314) : 凸緣的相對直徑 毛坯的相對厚度( dt ) 100 ~ ~ ~ ~ ? ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ . ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ mm ???濟(jì)南大學(xué)畢業(yè)設(shè)計 參考文獻(xiàn) 12 1 dhdh ?? mm ??總第一次拉深 : (314) (315) 綜上所述三次拉伸都可以 一次拉深成功 翻邊工序 利用模具把材料上孔的或圓弧毛胚外緣翻成樹邊的沖壓加工方法,翻邊有外緣翻邊和內(nèi)緣翻邊兩種,在本零件的加工中用到的是外緣翻邊。 工藝 方案的確定 通過以上的方案分析,可以看出:在一定的生產(chǎn)批量條件下,選用方案二:本套模具采用 的兩種 復(fù)合模 ,是比較合理的。排樣圖如圖 22所示: 圖 2— 2排樣圖 255.22 5 3濟(jì)南大學(xué)畢業(yè)設(shè)計 參考文獻(xiàn) 7 畫出零件成形步驟圖 成形流程如圖 23 所示: 圖 2— 3成形流程圖 方案種類 根據(jù)制作工藝分析,其七 個基本工序 :落料、一次拉深、二次拉深、三次拉伸、翻邊,張形、成形。 零件的生產(chǎn)批量 該沖壓件的月生產(chǎn)批量為 1000 件,屬于中低等批量的生產(chǎn)類型,因此不考慮多排、或一模多件的方案 (該方案較適宜大批量生產(chǎn),約幾十萬件以上 );也不考慮采用簡易沖裁模常用的單、直排方案,根據(jù)成批生產(chǎn)的特點,再結(jié)合該沖壓的形狀特點,以直排、一模一件排樣方案為宜。同時由 于零件的成形材料較薄、形狀復(fù)雜特殊 , 因此成形比較困難 , 需要多個工序。精度達(dá)到1~2μm ,壽命 2億次左右的多工位級進(jìn)模國內(nèi)已有多家企業(yè)能夠生產(chǎn)。 圖 沖壓工序的分類 沖壓工序按變形性質(zhì)可分為分離工序和成形工序兩大類。 關(guān)鍵詞 : 沖壓工藝分析 模具結(jié)構(gòu) 浮動模具 模具 設(shè)計 ii ABSTRACT The design is a designment on stamping process and shaping die design for the automobile introduces a machine ponents automobile fan, stamping process, stamping parts of the identification process. Design a rational stamping die on the concrete automobile fan Process method for determining the reasonable selection of convex, Die gap and the best design methods and processes. This mold design is a prominent feature of the plex to try to use the pound die, address conventional stamping process Die Loops, Processlong route, the high production costs, low efficiency shortings. And for the future of such parts stamping process of the establishment and die design provides a reliable basic. By using literature domestic and international,I had understood the development of the mold and its trend of also drawed on some good approaches and is more,under the guidance of our teachers ,I have learned to use my professional knowledge to plete the task. The standardization of Flanging die design is difficult to usually use the requirements and methodologies of general design. Disc parts is widespreadly used in ourlives, with the help of the disk and outside edge flanging model ,it can greatly improve the efficiency of our addition, the mold design is the machinery industry the fastest growing industries in the the machinery industry , as well as, the most promising industry. I get a lot of practical significance during the time of doing this task, in the same time,it also a semester examination during my university courses. I believe that through the design, my practical ability will be a great the other hand, it can make me understand knowledge deepenly and lay the foundation for me to learning more knowledge in the future. The mold structure and process is reasonable, correct, mold design is simple, reliable and easily is a diestroke efficiency of production is high and the precision of the workpiece is die is tried in some production is proved that operating and maintaining is very convenient, safe and is said that it has greatly reduced the labor intensity and that the use of effective and costeffective can be widespreadly used in the machinery industry and met with the basic requirements of die manufacturing. 濟(jì)南大學(xué)畢業(yè)設(shè)計 第一章 緒論 1