汽車前燈罩的沖壓模具設(shè)計(jì)【含圖紙】
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畢業(yè)設(shè)計(jì)(論文)任務(wù)書I、畢業(yè)設(shè)計(jì)(論文)題目:汽車前燈罩的沖壓模具設(shè)計(jì)II、畢 業(yè)設(shè)計(jì)(論文)使用的原始資料(數(shù)據(jù))及設(shè)計(jì)技術(shù)要求:1. 燈罩零件圖2.生產(chǎn)綱領(lǐng):中等批量3.要求完成零件的沖壓工藝分析和沖壓工藝規(guī)程的編制。1) 分析沖件成形工藝及坯料展開 2)編制燈罩零件沖壓工藝 3)完成燈罩模具設(shè)計(jì)III、畢 業(yè)設(shè)計(jì)(論文)工作內(nèi)容及完成時(shí)間:1. 查閱相關(guān)資料,外文資料翻譯(6000字符以上),撰寫開題報(bào)告。第1周第2周3.繪制燈罩板沖件圖,分析沖件成形工藝及坯料展開 第3周第6周4.編制燈罩沖壓成形工藝規(guī)程; 第7周第8周5.繪制燈罩模具總裝圖及零件圖; 第9周第13周6.撰寫畢業(yè)設(shè)計(jì)說明書(論文) 第14周第16周7.畢業(yè)設(shè)計(jì)審查,畢業(yè)答辯。 第17周 、主 要參考資料:1.沖模設(shè)計(jì)手冊(cè)編寫組.沖模設(shè)計(jì)手冊(cè).北京:沖模設(shè)計(jì)手冊(cè),19952. 陳為國.帶缺口筒形件沖壓工藝及模具設(shè)計(jì).金屬成形工藝,1998.23.王新華,袁聯(lián)富編.沖模結(jié)構(gòu)圖冊(cè).北京:機(jī)械工業(yè)出版社,20034.羅益旋.沖壓新工藝新技術(shù)及模具設(shè)計(jì)實(shí)用手冊(cè). 銀聲音像出版社,20045. GB28512875冷沖模國家標(biāo)準(zhǔn) 航空與機(jī)械工程 系 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 專業(yè)類 0781053 班學(xué)生(簽名): 填寫日期: 2011 年 01 月 03 日指導(dǎo)教師(簽名): 助理指導(dǎo)教師(并指出所負(fù)責(zé)的部分):機(jī)械設(shè)計(jì)制造及其自動(dòng)化 系主任(簽名):附注:任務(wù)書應(yīng)該附在已完成的畢業(yè)設(shè)計(jì)說明書首頁。附錄:燈罩零件圖畢業(yè)設(shè)計(jì)(論文)外文文獻(xiàn)翻譯題目 汽車前燈罩的沖壓模具設(shè)計(jì)專 業(yè) 名 稱 機(jī)械設(shè)計(jì)制造及其自動(dòng)化班 級(jí) 學(xué) 號(hào) 078105319學(xué) 生 姓 名 聶文軍指 導(dǎo) 教 師 陳為國填 表 日 期 2011 年 05 月 20 日Mould type of numerical control process computer assist the cutter choose and studyForewordNumerical control include cutter production and cutter of orbit choose two key problems process ,. The first problem has been got and studied extensivly and deeply over the past 20 years, a lot of algorithms developed have already got application in commercial CAD/ CAM system. Most CAM systems can produce the cutter orbit automatically after users input relevant parameters at present. Comparatively speaking , it is still not ripe to regard quality , efficiency as the research of choosing the problem of cutter of optimizing the goal correctly, do not have commercial CAM system that can offer the preferred decision support tool of cutter at present, therefore it is difficult to realize the integrating automatically and organically of CAD/ CAM. The cutter is chosen to usually include cutter type and cutter size. Generally speaking , suitable for one processing cutter of target for much kind , one cutter can finish different processing tasks, so it is easier to only consider meeting the cutter that basically processes the requirement and choose, especially to geometirc characteristics of model such as the hole , trough ,etc. But in fact, it is common for cutter to choose and sure optimization goal interrelate, for instance most heavy to cut efficiency , process time , minimum process cost , longest service life ,etc. at least, so the cutter is chosen it is a complicated optimization question. Such as mould type one of parts, because the geometirc form is complicated (usually include curved surface of freedom and island), influence geometry that cutter choose it restrains from to be can explicit to say among CAD model, need to design the corresponding algorithm to draw, therefore choose the cutter specification suitable and cutter association , it is not easy things by improving efficiency and quality processed in numerical control.Mould type generally with preparation method that numerical control mill, usually including rough machining, half finish machining , precise process of processing etc. The principle of rough machining is to spare no effort to remove the surplus metal with high efficiency, therefore hope to choose the larger cutter, but the cutter is oversized, may cause the increase of the crude volume ; Half finish machining of tasks to remove rough machining leave over step that get off mainly; Finish machining mainly guarantees size of the part and surface quality. Consider , go on , select exist , sure by computer difficult automatically totally up till now, therefore assist the cutter to choose in the computer that we developed (Computer Aided Tool Selection , CATS) among the system, base on , provide one aid decision tool for user, rough machining , half finish machining , precise to process etc., the real policy-making power is still left to users, in order to give full play to the advantages of computer and people.1 Basic structure of the system CATS system is CAD model, output for cutter type , cutter specification , mill depth of sharpening , enter the giving amount , rotational speed of main shaft (cut the pace ) and process six parameters such as time (such as Fig. 1), including choosing the aid decision tool in cutter type, rough machining cutter choose aid decision tool, half finish machining cutter choose aid decision tool and finish machining cutter choose aid decision tool ,etc.Given the rough machining in Xingqiang processing of the important position (usually rely time 510 times), rough machining, the system automatically optimize portfolio with cutlery functions to enhance overall processing efficiency. In addition to the decision-making tools, the system also has a detailed look cutlery norms, based on the type and size cutlery recommended processing parameters and assess the function of processing time, the last generation of the overall results of choice cutlery statements (figure 2). All the data and knowledge systems cutlery done by the background database support.2 Key technologies and algorithms2.1 Cutlery type choiceAccording to Assistant Xingqiang digital processing practice, Xingqiang Xi state general processing cutlery into milling cutter, milling cutter radius milling cutter and the first three balls. D based cutlery diameter, radius radius r when r=0 for milling cutter, 0RCutlery can be divided into the overall style and embed films ceremony. For inlay film style, the key is to select the materials razor blades, razor blades materials choice depends on three elements : the processing of working materials, machine tools and cutlery jig stability of the state structures. Processing system will be translated into material steel, stainless steel, cast iron, nonferrous metals, materials and hard to cut materials six groups. Machine tool jig stability into good, better and less than three levels. Cutlery investigation into the short and long cantilever structures two, the system automatically reasoning on the basis of the specific circumstances of razor blades materials, decision-making knowledge from Walter cutlery manual system by the users first choice cutlery type in the world. To embed film style cutlery, a rules-based automated reasoning suitable razor blades materials. For example, if the final processing of materials for the steel, machine tool jig for good stability, cutlery cantilever structures for short, razor blades materials for WAP25.Rough machining cutlery portfolio optimizationXingqiang rough machining the aim is to maximize the removal of excess metal normally used milling cutter, take-cutting approach. Thus, 3D mould Xingqiang the rough machining process, is actually a series of 2.5D components Xingqiang processing. Cutlery optimization is to find a group of cutlery portfolio, allowing for maximum efficiency removal of most metals. Cutlery portfolio optimized basic methods as follows :A. To do some long step into knife in the direction of a group of vertical and horizontal search Xingqiang another entity to form a search layer.B. Derive closed to the contours.C. Calculated between Central and outside the island or islands and the distance between the key that affect cutlery choice geometric constraints algorithm flow As shown in figure 3D. According to the principle of the merger (adjacent to the critical distance will be smaller than the difference between the threshold) to search layer merger, graphic processing and identifying viable cutlery sets, a processing layer.E. Determine the use of each processing layer cutlery, cutlery Xingqiang processing portfolio. F. According cutlery recommended processing parameters (cutting speed, depth and into Xianxiao to speed), the calculation of material removal. G. According to the actual removal of the volume processing layer, the processing time for each processing layer. H. Xingqiang calculating the total processing time and residual volume.I. The overall portfolio of the Group cutlery processing efficiency assessment. J . Repeat ai until derive optimal mix of cutlery. If time is the goal, called for the entire processing time t Xingqiang shortest portfolio to optimize cutlery.2.2 Semi-finished cutlery choiceThe main purpose is to remove semi-finished rough machining residual contours of the new warrants. To completely remove height, depth must be greater than Xianxiao parts of each level to the surface distance x. Its algorithm steps are as follows :Step 1:entity models from parts of two adjacent to the cross section of the surface contours and the corresponding length;Step 2: The average length of contours;Step 3:calculate its width;Step 4 : calculating height floor to the surface of parts to the law distance x;Step 5 : steps 1 repeat steps 4, each level of decision Xianxiao depth;Step 6 : calculate cutlery diameter D, by or under cutlery experience D=x/0.6 manual recommended;steps7 : choose Xianxiao x depth than the smallest cutlery.2.3 fine cutlery choice Fine cutlery choice is the basic principle : cutlery parts surface radius smaller than the smallest size R curve radius r, the general admission R= (0.80.9) r. Its algorithm steps are as follows :Step 1 : from the smallest curve radius calculation model parts entities; Step 2 : From cutlery database search radius of less than a cutlery calculated radius of the curve all cutlery; Step 3 : select the best cutlery meet the above requirements; Step 4 : If all cutlery than the smallest curve radius, the smallest chosen as a recommended cutlery.3 summary and discussionMould type of craft of processing plan , need high technology and experience very usually, prepare NC time of data nearly and process time to be large. So person who produce of craft of processing plan and NC process demand of the order right away seem further more urgent automatically.This text system research mould type of craft cutter plan , choose problem, put forward mould of rough machining , half finish machining , finish machining principle and method that cutter chooses, the realization algorithm with corresponding structure , and has carried on the realization of preliminary programming under the environment of UG/OPEN API, have developed CATS prototype system. In cutter type and on the foundation that the specification is fixed, system also can recommend parameter of processing according to cutter manual (cut pace , mill , sharpen depth , enter person who give ,etc.), evaluate corresponding processing time. Final purpose its to realize integration of CAD/CAM really , produce through aftertreatment numerical control process the order.Need to point out , should improve the mould type totality of and process efficiency, need it from the rough machining , half finish machining , consideration on the whole of finish machining , make up and optimize many targets, this will be work that we want to carry on next .模具型腔數(shù)控加工計(jì)算機(jī)輔助刀具選擇和研究引言 數(shù)控加工中包括刀具軌跡的產(chǎn)生和刀具選擇兩個(gè)關(guān)鍵問題。前一問題在過去的20 年里得到了廣泛而深入地研究, 發(fā)展的許多算法已在商用CAD/ CAM 系統(tǒng)中得到應(yīng)用。目前大多數(shù)CAM 系統(tǒng)能夠在用戶輸入相關(guān)參數(shù)后自動(dòng)產(chǎn)生刀具軌跡。比較而言,對(duì)以質(zhì)量、效率為優(yōu)化目標(biāo)的刀具選擇問題的研究還遠(yuǎn)未成熟,當(dāng)前還沒有商用CAM 系統(tǒng)能夠提供刀具優(yōu)選的決策支持工具,因而難以實(shí)現(xiàn)CAD/ CAM 的自動(dòng)有機(jī)集成。刀具選擇通常包括刀具類型和刀具尺寸。一般來說,適合一個(gè)加工對(duì)象的刀具通常有多種,一種刀具又可完成不同的加工任務(wù),所以僅考慮滿足基本加工要求的刀具選擇是較容易的,尤其對(duì)孔、槽等典型幾何特征。但實(shí)際上,刀具選擇通常和一定的優(yōu)化目標(biāo)相聯(lián)系,如最大切削效率、最少加工時(shí)間、最低加工成本、最長使用壽命等,因此刀具選擇又是一個(gè)復(fù)雜的優(yōu)化問題。比如模具型腔類零件,由于幾何形狀復(fù)雜(通常包含自由曲面及島) ,影響刀具選擇的幾何約束在CAD 模型中不能顯式表示,需要設(shè)計(jì)相應(yīng)的算法進(jìn)行提取,因而選擇合適的刀具規(guī)格及其刀具組合,以提高數(shù)控加工的效率與質(zhì)量并非易事。 模具型腔一般用數(shù)控銑的加工方法,通常包括粗加工、半精加工、精加工等工序。粗加工的原則就是盡最大可能高效率地去除多余的金屬,因而希望選擇大尺寸的刀具,但刀具尺寸過大,可能導(dǎo)致未加工體積的增多;半精加工的任務(wù)主要是去除粗加工遺留下來的臺(tái)階;精加工則主要保證零件的尺寸及表面質(zhì)量??紤]到目前完全由計(jì)算機(jī)進(jìn)行自動(dòng)選刀還存在一定困難,因而在我們開發(fā)的計(jì)算機(jī)輔助刀具選擇(Computer Aided Tool Selection ,CATS)系統(tǒng)中,立足于給用戶提供一個(gè)輔助決策工具,即粗加工、半精加工、精加工等,真正的決策權(quán)仍留給用戶,以充分發(fā)揮計(jì)算機(jī)和人的優(yōu)勢。 1 系統(tǒng)基本結(jié)構(gòu) CATS系統(tǒng)的輸入為CAD模型,輸出為刀具類型、刀具規(guī)格、銑削深度、進(jìn)給量、主軸轉(zhuǎn)速(切削速度) 和加工時(shí)間等六個(gè)參數(shù)(如圖1) ,包括刀具類型選擇輔助決策工具、粗加工刀具選擇輔助決策工具、半精加工刀具選擇輔助決策工具及精加工刀具選擇輔助決策工具等鑒于粗加工在型腔加工中的重要地位(通常為精加工時(shí)間的510 倍) ,粗加工時(shí)系統(tǒng)具有刀具自動(dòng)優(yōu)化組合的功能,以提高整體加工的效率。除了上述決策工具外,系統(tǒng)還具有查看刀具詳細(xì)規(guī)范、根據(jù)刀具類型和尺寸推薦加工參數(shù)及評(píng)估加工時(shí)間等功能,最后生成總的刀具選擇結(jié)果報(bào)表。系統(tǒng)所有的刀具數(shù)據(jù)及知識(shí)均由后臺(tái)數(shù)據(jù)庫做支持。 2 關(guān)鍵技術(shù)及算法 2.1 刀具類型選擇 根據(jù)模具型腔數(shù)控加工實(shí)踐,型腔銑加工的刀具一般分為平頭銑刀、圓角銑刀及球頭銑刀三種。設(shè)刀具直徑為D,圓角半徑為r ,當(dāng)r=0 時(shí)為平頭銑刀,0R 刀具又可分為整體式和鑲片式。對(duì)于鑲片式,關(guān)鍵是選取刀片的材質(zhì),刀片材質(zhì)的選擇取決于三個(gè)要素:被加工工件的材料、機(jī)床夾具的穩(wěn)定性以及刀具的懸臂狀態(tài)。系統(tǒng)將被加工工件的材料分為鋼、不銹鋼、鑄鐵、有色金屬、難切削材料和硬材料等六組。機(jī)床夾具的穩(wěn)定性分為很好、好、不足三個(gè)等級(jí)。刀具懸臂分為短懸臂和長懸臂兩種,系統(tǒng)根據(jù)具體情況自動(dòng)推理出刀片材質(zhì),決策知識(shí)來源于WALTER刀具手冊(cè),系統(tǒng)由用戶首先交互選擇刀具類型。對(duì)鑲片式刀具,基于規(guī)則自動(dòng)推理出合適的刀片材質(zhì)。例如,如果被加工工件的材料為“鋼”,機(jī)床夾具的穩(wěn)定性為很好,刀具懸臂為短懸臂,則刀片材質(zhì)應(yīng)為WAP25 。 粗加工刀具組合優(yōu)化 型腔粗加工的目的就是最大化地去除多余的金屬,通常使用平頭銑刀,采取層切的方法。因此,3D模具型腔的粗加工過程,實(shí)際上就是對(duì)一系列2.5D模具型腔的加工。刀具優(yōu)化的目的就是要尋找一組刀具組合,使其能夠以最高的效率切除最多的金屬。刀具組合優(yōu)化的基本方法如下: A. 以一定的步長做一組垂直于進(jìn)刀方向的搜索平面與型腔實(shí)體相交,形成若干搜索層。 B. 求出截交輪廓。 C. 計(jì)算內(nèi)外環(huán)之間或島與島之間的關(guān)鍵距離,即影響刀具選擇的幾何約束. D. 根據(jù)合并原則(相鄰關(guān)鍵距離相差小于給定閾值) 對(duì)搜索層進(jìn)行合并,確定加工平面和可行刀具集,形成加工層。 E. 確定每一加工層使用的刀具,即型腔加工的刀具組合。 F. 根據(jù)刀具推薦的加工參數(shù)(切削速度、銑削深度和進(jìn)給速度) ,計(jì)算材料去除率。 G. 根據(jù)加工層實(shí)際切除的體積,計(jì)算每一加工層的加工時(shí)間。 H. 計(jì)算型腔總的加工時(shí)間和殘余體積。 I. 對(duì)該組刀具組合的總體加工效率進(jìn)行評(píng)估。 J. 重復(fù)ai,直至求出最優(yōu)的刀具組合。如以時(shí)間為目標(biāo),即要求以整個(gè)型腔的加工時(shí)間t 最短來優(yōu)化刀具組合。 2.2半精加工刀具選擇 半精加工的主要目的是去除粗加工殘留下的臺(tái)階狀輪廓。為完全去除臺(tái)階,銑削深度必須大于每一臺(tái)階到零件表面的距離x。其算法步驟如下: 步驟1 由零件實(shí)體模型獲得兩個(gè)相鄰截面的表面積以及相應(yīng)的輪廓長度; 步驟2 計(jì)算平均輪廓長度; 步驟3 計(jì)算臺(tái)階寬度; 步驟4 計(jì)算臺(tái)階拐角到零件表面的法向距離x ; 步驟5 重復(fù)步驟1步驟4 ,決定每一臺(tái)階的銑削深度; 步驟6 計(jì)算刀具直徑D, 按經(jīng)驗(yàn)D=x/0.6或根據(jù)刀具手冊(cè)推薦; 步驟7 選擇銑削深度大于x 的最小刀具。 2.3 精加工刀具選擇 精加工刀具選擇的基本原則是:刀具半徑尺寸R 小于零件表面最小的曲率半徑r,一般取R=(0.80.9)r。其算法步驟如下: 步驟1: 從零件實(shí)體模型計(jì)算最小曲率半徑; 步驟2: 從刀具庫中檢索出刀具半徑小于計(jì)算所得的曲率半徑的所有刀具; 步驟3: 選出滿足上述要求的最大刀具; 步驟4: 如果所有刀具大于最小的曲率半徑,選擇最小的作為推薦刀具。 3 小結(jié)與討論 模具型腔加工的工藝規(guī)劃通常需要很高的技術(shù)與經(jīng)驗(yàn),準(zhǔn)備NC 數(shù)據(jù)的時(shí)間幾乎和加工時(shí)間一樣多。因此,自動(dòng)產(chǎn)生型腔加工的工藝計(jì)劃及NC加工指令的需求就顯得愈加迫切。 本文系統(tǒng)研究了模具型腔工藝規(guī)劃中的刀具選擇問題,提出了模具型腔粗加工、半精加工、精加工刀具選擇的原則和方法,構(gòu)造了相應(yīng)的實(shí)現(xiàn)算法,并在UG/OPEN API環(huán)境下進(jìn)行了初步編程實(shí)現(xiàn),開發(fā)了CATS原型系統(tǒng)。在刀具類型和規(guī)格確定的基礎(chǔ)上,系統(tǒng)還可根據(jù)刀具手冊(cè)推薦加工參數(shù)(切削速度、銑削深度、進(jìn)給量等) ,對(duì)相應(yīng)的加工時(shí)間進(jìn)行評(píng)估。其最終目的是真正實(shí)現(xiàn)CAD/CAM的集成,繼而通過后處理產(chǎn)生數(shù)控加工指令。目前CATS系統(tǒng)的界面還是獨(dú)立于UG的CAM界面,CATS的決策結(jié)果還需要用戶重新輸入到CAM。 需要指出的是,要提高模具型腔的總體加工效率,需要從粗加工、半精加工、精加工的整體上考慮,進(jìn)行多目標(biāo)組合優(yōu)化,這將是我們下一步要進(jìn)行的工作。 學(xué)士學(xué)位論文原創(chuàng)性聲明本人聲明,所呈交的論文是本人在導(dǎo)師的指導(dǎo)下獨(dú)立完成的研究成果。除了文中特別加以標(biāo)注引用的內(nèi)容外,本論文不包含法律意義上已屬于他人的任何形式的研究成果,也不包含本人已用于其他學(xué)位申請(qǐng)的論文或成果。對(duì)本文的研究作出重要貢獻(xiàn)的個(gè)人和集體,均已在文中以明確方式表明。本人完全意識(shí)到本聲明的法律后果由本人承擔(dān)。作者簽名: 日期:學(xué)位論文版權(quán)使用授權(quán)書本學(xué)位論文作者完全了解學(xué)校有關(guān)保留、使用學(xué)位論文的規(guī)定,同意學(xué)校保留并向國家有關(guān)部門或機(jī)構(gòu)送交論文的復(fù)印件和電子版,允許論文被查閱和借閱。本人授權(quán)南昌航空大學(xué)科技學(xué)院可以將本論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索,可以采用影印、縮印或掃描等復(fù)制手段保存和匯編本學(xué)位論文。 作者簽名: 日期:導(dǎo)師簽名: 日期: 畢業(yè)設(shè)計(jì)(論文)題目: 汽車前燈罩的沖壓模具設(shè)計(jì) 系 別 航空與機(jī)械工程系專業(yè)名稱 機(jī)械設(shè)計(jì)制造及其自動(dòng)化班級(jí)學(xué)號(hào) 078105319學(xué)生姓名 聶文軍指導(dǎo)教師 陳為國二O一一 年 五 月 畢業(yè)設(shè)計(jì)(論文)開題報(bào)告題目 汽車前燈罩的沖壓模具設(shè)計(jì)專 業(yè) 名 稱 機(jī)械設(shè)計(jì)制造及其自動(dòng)化班 級(jí) 學(xué) 號(hào) 078105319學(xué) 生 姓 名 聶文軍指 導(dǎo) 教 師 陳為國填 表 日 期 2011 年 5 月 20 日說 明開題報(bào)告應(yīng)結(jié)合自己課題而作,一般包括:課題依據(jù)及課題的意義、國內(nèi)外研究概況及發(fā)展趨勢(含文獻(xiàn)綜述)、研究內(nèi)容及實(shí)驗(yàn)方案、目標(biāo)、主要特色及工作進(jìn)度、參考文獻(xiàn)等內(nèi)容。以下填寫內(nèi)容各專業(yè)可根據(jù)具體情況適當(dāng)修改。但每個(gè)專業(yè)填寫內(nèi)容應(yīng)保持一致。一、 選題的依據(jù)及意義: 汽車制造是現(xiàn)代化工業(yè)中比較重要的一部分,而沖壓是汽車零部件制造中廣泛采用的技術(shù)。因?yàn)樽约簩?duì)汽車有濃厚的興趣,現(xiàn)在決定以此為課題,進(jìn)行汽車前燈罩的沖壓模具設(shè)計(jì)。沖壓是應(yīng)用非常廣泛的成型加工方法,沖壓模質(zhì)量的好壞不僅關(guān)系到產(chǎn)品的質(zhì)量,也關(guān)系到生產(chǎn)的效率。進(jìn)行沖壓模設(shè)計(jì),不僅考察學(xué)生的機(jī)械結(jié)構(gòu)設(shè)計(jì)能力,也可以鍛煉學(xué)生綜合運(yùn)用所學(xué)知識(shí)解決具體實(shí)際問題的能力。二、國內(nèi)外研究概況及發(fā)展趨勢(含文獻(xiàn)綜述): 隨著我國成為世界制造業(yè)的中心,電子信息技術(shù)中的電子元器件和汽車部件越來越多的成為中國制造,而模具是機(jī)械、電子、汽車、家電等工業(yè)產(chǎn)品的基礎(chǔ)工藝裝備,作為工業(yè)基礎(chǔ),模具的質(zhì)量、精度、壽命對(duì)其它工業(yè)的發(fā)展起著十分重要的作用,在國際上稱為“工業(yè)之母”。 2005年我國模具產(chǎn)值為610億人民幣,2006年約720億,平均每年以20%25%的速度增長。模具的技術(shù)水平明顯有了提高,一些國產(chǎn)優(yōu)質(zhì)模具的性能已接近國外同類產(chǎn)品的先進(jìn)水平,但由于我國起步晚,許多模具不得不依賴進(jìn)口,與發(fā)達(dá)國家相比差距還非常大。 隨著科學(xué)技術(shù)的不斷進(jìn)步和工業(yè)生產(chǎn)的迅速發(fā)展,許多新技術(shù)、新工藝、新設(shè)備、新材料不斷涌現(xiàn),因而促進(jìn)了沖壓技術(shù)的不斷革新和發(fā)展。其主要發(fā)展如下: 1. 工藝分析計(jì)算的現(xiàn)代化。它將與現(xiàn)代數(shù)學(xué)、計(jì)算機(jī)技術(shù)聯(lián)姻,對(duì)加工零件進(jìn)行計(jì)算機(jī)模擬和有限元分析,達(dá)到預(yù)測某一工藝方案對(duì)零件成形的可能性與成形過程中可能會(huì)發(fā)生的問題,供設(shè)計(jì)人員修改和選擇。 2 .模具計(jì)算輔助設(shè)計(jì)、制造與分析(CAD/CAM/CAE)的研究和應(yīng)用將極大地提高模具制造效率,提高模具質(zhì)量,使模具設(shè)計(jì)與制造技術(shù)實(shí)現(xiàn)一體化。 3. 模具的標(biāo)準(zhǔn)化、商品化、機(jī)械化及專業(yè)化自動(dòng)生產(chǎn)。三、研究內(nèi)容及實(shí)驗(yàn)方案:研究內(nèi)容:1、產(chǎn)品零件工藝分析2、沖壓模具設(shè)計(jì)3、主要零件制造工藝的確定。本課題研究方法:1) 設(shè)計(jì)前的準(zhǔn)備: 豐富模具設(shè)計(jì)基礎(chǔ)知識(shí),熟悉燈罩結(jié)構(gòu)及設(shè)計(jì)過程熟悉沖壓成形原理及整個(gè)流程。2) 零件二維平面圖紙: 利用CAD軟件畫出工件二維工程圖紙。3) 模具設(shè)計(jì): 1. 對(duì)所設(shè)計(jì)模具之產(chǎn)品進(jìn)行可行性分析 。 2確定模具結(jié)構(gòu)。 3排樣圖的設(shè)計(jì)及材料利用率計(jì)算 4沖裁壓力和壓力中心計(jì)算 5凸、凹模設(shè)計(jì) 6凸、凹模刃口尺寸的確定。 7其它零件的設(shè)計(jì) 8壓力機(jī)的選擇 9結(jié)束語4) 設(shè)計(jì)說明書 : 闡述燈罩零件圖的繪制過程工程及整個(gè)模具設(shè)計(jì)過程。四、目標(biāo)、主要特色及工作進(jìn)度目標(biāo):1、 獨(dú)立完成畢業(yè)設(shè)計(jì)2、 按圖標(biāo)準(zhǔn)設(shè)計(jì)一套模具的裝配圖和有關(guān)的關(guān)鍵零件圖。3、 制訂模具的裝配工藝和成形零件的工藝。4、 按學(xué)院畢業(yè)設(shè)計(jì)的書寫格式要求,撰寫設(shè)計(jì)說明書。5、 完成3000-5000個(gè)文字的畢業(yè)設(shè)計(jì)有關(guān)的外文資料翻譯。工作進(jìn)度:1. 查閱相關(guān)資料,外文資料翻譯(6000字符以上),撰寫開題報(bào)告。第1周第2周2.繪制燈罩板沖件圖,分析沖件成形工藝及坯料展開。 第3周第6周3.編制燈罩沖壓成形工藝規(guī)程。 第7周第8周4.繪制燈罩模具總裝圖及零件圖。 第9周第13周5.撰寫畢業(yè)設(shè)計(jì)說明書(論文)。 第14周第16周6.畢業(yè)設(shè)計(jì)審查,畢業(yè)答辯。 第17周五、參考文獻(xiàn)1 肖祥芷,王孝培主編.中國模具設(shè)計(jì)大典3.南昌:江西科學(xué)出版社,2003.12 王孝培主編.沖壓手冊(cè).第二版.北京:機(jī)械工業(yè)出版社,2000.103 王芳主編.冷沖壓模具設(shè)計(jì)指導(dǎo).機(jī)械工業(yè)出版社,1998 4 王春武,齊廣霞,揭錢發(fā)編著.冷沖壓模具設(shè)計(jì).北京:兵器工業(yè)出版社,1995.85 陳炎嗣,郭景儀主編.沖壓模具設(shè)計(jì)與制造技術(shù).北京:北京出版社,19916 楊玉英主編.實(shí)用沖壓工藝及模具設(shè)計(jì)手冊(cè).北京:機(jī)械工業(yè)出版社,20057 廖念釗,莫雨松,李碩根,楊興駿編.互換性與技術(shù)測量.第四版.北京:中國計(jì)量出版社,2001.1 8 大連理工大學(xué)工程畫教研室編.機(jī)械制圖.第四版.北京:高等教育出版社,1993 9 王樹勛,高廣升編.冷沖壓模具結(jié)構(gòu)圖冊(cè)大全.廣州:華南理工大學(xué)出版社,1997
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