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南京工程學(xué)院高等教育自學(xué)考試 畢業(yè)生學(xué)士學(xué)位申請表 承辦學(xué)院 江蘇財經(jīng)職業(yè)技術(shù)學(xué)院 專業(yè) 數(shù)控加工與模具設(shè)計 姓 名 吳英 性 別 女 身份證號 321283198902231021 聯(lián)系電話 18936383021 準(zhǔn)考證號 088810202012 班 級 10模具（本） 入學(xué)年月 年 月 畢業(yè)年月 年 月 外 語 情 況 □國家大學(xué)英語四級考試成績達(dá)到授予標(biāo)準(zhǔn) t國家組織的本科段自學(xué)考試英語成績達(dá)70分及以上 本科畢業(yè) 證書編號 擬申報學(xué)士學(xué)位科類名稱 學(xué)學(xué)士 申報材料目錄 1、學(xué)習(xí)成績單 2、“外語情況”欄目中材料原件及復(fù)印件 3、身份證復(fù)印件 4、在校期間無違紀(jì)（如考試作弊等）行為 承辦學(xué)院蓋章 年　　月　　日 南京工程學(xué)院自考辦推薦意見： （蓋章） 年 月 日 學(xué)位證書號碼： 二、The injection and Compression Molding Injection molding si principally used for the production of the thermoplastic parts, although some progress has been made in developing a method for injection molding some thermosetting materials. The problem of injecting a melted plastic into a mold cavity form a reservoir of melted material has been extremely difficult to solve for thermosetting plastics which cure and harden under such conditions within a few minutes. The principle of injection molding is quite similar to that of die-casting. The process consists of feeding a plastic compound in powdered or granular form from a hopper through metering and melting stages and then injecting it into a mold. After a brief coolling period, the mold is opened and the solidified part ejected. Injection-molding machines can be arranged for manual operation, automatic single-cucle operation, and full automatic operation. The advantage of injection molding are: (i) a high molding speed adapted for mass production is possible; (ii) there is a wide choice of thermoplastic materials providing a variety of usefull properties; (iii) it is possible to mold threads, undercuts, side holes, and large thin sections. Several methods are used to force or inject the melted plastic into the mold. The most commonly used system in the larger machines is the in-line reciprocating screw.The screw acts as a combination and plasticizing unit.As the plastic is fed to the rotating screw,it passes through three zones as shown: feed,compression, and metering. After the feed zone, the screw-flight depth is gradually reduced,forcing the plastic to compress. The work is converted to heat by shearing the plastic, making it a semifluid mass. In the metering zone, additional heat is applied by conduction from the barrel surface. As the chamber in front of the screw becomes filled, it forces the screw back, tripping a limit switch that activates a hydraulic cylinder that forces the screw forward and injects the fluid plastic into the closed mold.An antiflowback valve prevents plastic under pressure from escaping back into the screw flights. The clamping force that a machine is capable of exerting is part of the size designation and is measured in tons. A rule-of-thumb can be used to determine the tonnage required for a particular job. It is based on two tons of clamp force per square inch of projected area. If the flow pattern is difficult and the parts are thin,this may have to go to three or four tons. Many reciprocating - screw machines are capable of handing thermosetting plastic materials.Previously these materials were handled by compression or transfer molding.Thermosetting materials cure or polymerize in the mold and are ejected hot in the range of 375℃～410℃.Thermoplastic parts must be allowed to cool in the mold in order to remove them without distortion.Thus thermosetting cycles can be faster.Of course the mold must be heated rather than chilled,as with thermoplastics. The importance of Injecting the mold are : ⑴、Plastics have the density small, the quality light, the specific tenacity big, the insulating property good, the dielectric loss low, the chemical stability strong, the formation productivity high and the price inexpensive and so on the merits, obtained day by day the widespread application in the national economy and people's daily life each domain, as early as in the beginning of 1990s, the plastic annual output already surpassed the steel and iron and the non-ferrous metal annual output sum total according to the volume computation.In mechanical and electrical (for example so-called black electrical appliances), domains and so on measuring appliance, chemical, the automobile and astronautics aviation, the plastic has become the metal the good substitution material, had the metal material plastic tendency. ⑵、Take the automobile industry as the example , as a result of the automobile lightweight, the low energy consumption development request, the automobile spare part material constitution occurred obviously has modelled the band steel the change, at present our country automobile plastic accounts for 5% which the automobile was self-possessed to 6%, but overseas has reached 13%, forecast according to the expert, the automobile plastic bicycle amount used will also be able further to increase.On modern vehicles, regardless of is outside installs the assorted items, the internal installation assorted items, the function and the structural element, all may use the plastic material, outside installs the assorted items to have the bumper, the fender, the wheel hub cap, the air deflector and so on; After the internal installation assorted items have in the display board, the vehicle door the board, the vice-display board, the sundry goods box lid, the chair, the guard shield and so on; The function and the structural element have the fuel tank, the radiator header, the spatial filter hood, the fan blade and so on.Statistics have indicated, our country in 2000 automobile output more than 200 ten thousand, the vehicle amounted to 1,380,000 tons with the plastic.Looked from the domestic and foreign automobile plastic application situation that, the automobile plastic amount used already became one of weight automobile production technical level symbols. ⑶、Injection of a molding formation as plastic workpiece most effective formation methods because may by one time take shape each kind of structure complex, the size precise and has the metal to inlay a product, and the formation cycle is short, may by mold multi-cavities, the productivity be high, when mass productions the cost isvery inexpensive, easy to realize the automated production, therefore holds the extremely important status in the plastic processing profession.Statistics have indicated, plastic mold composition all molds (including metal pattern) 38.2%, the plastic product gross weight about 32% is uses in injecting the formation, 80% above engineering plastics product all must use the injection formation way production. 4. counts according to the customs, our country in 2000 altogether imported mold 977,000,000 US dollars, in which plastic molding forms altogether 550,000,000 US dollars, occupied for 56.3%,2001 years altogether to import mold 1,112,000,000 US dollars, in which plastic molding forms altogether 616,000,000 US dollars, accounted for 55.4%.From the variety, the import volume biggest is the plastic molding forms. ⑷、Counts according to the customs, our country in 2000 altogether imported mold 977,000,000 US dollars, in which plastic molding forms altogether 550,000,000 US dollars, occupied for 56.3%, 2001 years altogether to import mold 1,112,000,000 US dollars, in which plastic molding forms altogether 616,000,000 US dollars, accounted for 55.4%.From the variety, the import volume biggest is the plastic molding forms. In compression molding the palstic material as powder or preforms is placed into a heated steel mold cavity,Since the parting surface is in a horizontal plane ,the upper half of the mold descends vertically.It closes the mold cavity and pressures for a predetermined period.A pressure of from 2 to 3 tons square inch and a temperaure at approximately 350F converts the plastic to a semiliquid which flows to all parts of the mold cavity.Usually from 1 to 15 minutes is required for curing,altough a recently developed alkyd plastic will cure in less than 25 secends. The mold is then opended and the molded part removed.If metal insers are desired in the parts,they should be placed in the mold cavity on pins or in the holes before the plastic is loaded.Also, the preforms should be preheated before loading into the mold cavity to eliminate gases,inprove flow,and decrease curing time.Dieletric heating is a convenient method of heating the preforms. Since the plastic material is placed directly into the mold cavity,the mold itself can be simpler than those used for other molding precesses.Gates and sprues are unnecessary.This also results in a saving in material,because trimmed-off gates and sprues would be a complete loss of the thermosetting plastic.The press require the full attention of one operator.However,several smaller presses can be operated by one operator. The presses are conveniently located so the operator can easilymove from one to the next.By the time he gets around to a particular press again,that mold will be ready to open.the thermosetting plastics which harden under heat and pressure are suitable for compression molding and transfer molding.It is not practical to moid shermoplastic materials by these methods,since the molds would have to be alternately heated and cooled.In order to harden and eject thermoplastic parts form the mold,cooling would be necessary. Types of molds for compression molding.The molds used for compression molding are classified into four basic types, namely ,positive molds,landed positive mold,flash-type molds,and semipositive molds.In a positive mold the plunger on the upper mold enters the lower mold cavity.since there are no lands or stops on the lower die ,the plunger completely trap the plastic material and descends with full pressure on the charge.A dense part with good electrical and physical properties is produced.The amount of plastic placed in the die cavity must be accurately measured,since it determines the thickness of the part .A landed positive mold is similar to a positive mold except that lands are added to stop the travel of the plunger at predetermined point.In this case,the lands absorb some of the pressure that should be exerted on the parts.The thickness of the parts will be accurately controlled,but the density may vary cansideraby.In a flash-type mold,flash redges are added ti the top and bottom molds.As the upper mold exerts pressure on the plastic,excess material is forced out between the flash ridges where it forms flash.This flash is further compressed.becomes hardened,and finally stops the downard thavel of the upper mold.A slight excess of the plastic material is always chared to ensure sufficient pressurs to produce a dense molded part.This type of mold is widely used because it is comparatively easy to construct and it controls thickness and density within colse limits.The semipositive mold is a combination od the flash type and landed posive molds.In addition to the flash ridges,a land is employed to restrict the travel of the upper mold. 南京工程學(xué)院 畢業(yè)設(shè)計開題報告 課 題 名 稱： 驅(qū)動橋鎖沖壓模具設(shè)計 學(xué) 生 姓 名： 吳英 指 導(dǎo) 教 師： 林偉 所 在 學(xué) 院： 江蘇財經(jīng)職業(yè)技術(shù)學(xué)院 專 業(yè) 名 稱： 數(shù)控加工與模具設(shè)計 南京工程學(xué)院 2012年 2月 28日 說 明 1．根據(jù)教育部對畢業(yè)設(shè)計（論文）的評估標(biāo)準(zhǔn)，學(xué)生必須撰寫《畢業(yè)設(shè)計（論文）開題報告》，由指導(dǎo)教師簽署意見、教研室審查，系教學(xué)主任批準(zhǔn)后實施。 2．開題報告是畢業(yè)設(shè)計（論文）答辯委員會對學(xué)生答辯資格審查的依據(jù)材料之一。學(xué)生應(yīng)當(dāng)在畢業(yè)設(shè)計（論文）工作前期內(nèi)完成，開題報告不合格者不得參加答辯。 3．畢業(yè)設(shè)計開題報告各項內(nèi)容要實事求是，逐條認(rèn)真填寫。其中的文字表達(dá)要明確、嚴(yán)謹(jǐn)，語言通順，外來語要同時用原文和中文表達(dá)。第一次出現(xiàn)縮寫詞，須注出全稱。 4．本報告中，由學(xué)生本人撰寫的對課題和研究工作的分析及描述，應(yīng)不少于2000字，沒有經(jīng)過整理歸納，缺乏個人見解僅僅從網(wǎng)上下載材料拼湊而成的開題報告按不合格論。 5．開題報告檢查原則上在第8周完成，各系完成畢業(yè)設(shè)計開題檢查后，應(yīng)寫一份開題情況總結(jié)報告。 學(xué)士學(xué)位畢業(yè)設(shè)計(論文)開題報告 學(xué)生姓名 吳英 學(xué) 號 088810202012 專 業(yè) 數(shù)控加工與模具設(shè)計 指導(dǎo)教師 姓 名 林偉 職 稱 講師 所在學(xué)院 江蘇財經(jīng)職業(yè)技術(shù)學(xué)院 課題來源 自擬課題 課題性質(zhì) 工程設(shè)計 課題名稱 驅(qū)動橋鎖沖壓模具設(shè)計 畢業(yè)設(shè)計的內(nèi)容和意義 1.主要內(nèi)容 本次畢業(yè)設(shè)計主要是針對圖1所示的產(chǎn)品完成其沖壓成形工藝及模具設(shè)計，具體地說需要完成如下各項任務(wù)： （1）繪制產(chǎn)品零件圖（二維和三維）； （2）查閱資料并就自己承當(dāng)?shù)恼n題方向?qū)懗鲩_題報告； （3）完成產(chǎn)品的工藝設(shè)計及模具設(shè)計并繪制模具及模具零件的工程圖； （4）按規(guī)定格式和要求用Word打印畢業(yè)設(shè)計（論文）一份； （5）用PowerPoint或其它軟件制作答辯提綱一份； 圖1驅(qū)動橋鎖三維圖 2.意義 畢業(yè)設(shè)計是對即將步入社會的我們設(shè)計能力的一次全面考核，是從學(xué)習(xí)書本知識向?qū)嶋H操作過渡的一個重要階段，目的在于培養(yǎng)我們獨立思考、動手以及解決問題的能力。從選定的課題入手，首先要仔細(xì)分析產(chǎn)品零件圖，只有對產(chǎn)品結(jié)構(gòu)、材料性能有了透徹的了解，才能進(jìn)行初步設(shè)計，并逐層展開。最重要的我們能夠獨立思考與設(shè)計，在老師的指導(dǎo)與工具資料的幫助下，能夠有更多的創(chuàng)造、更多屬于自己的成果。四年中我們所學(xué)的一切專業(yè)知識都將在這里得到運用，這將是我們踏上工作道路的最后一次演練，更是理論與實際相結(jié)合的實戰(zhàn)演練。 文獻(xiàn)綜述 1.沖壓模具發(fā)展歷史和國外沖壓模具發(fā)展?fàn)顩r 我國模具CAD/CAM技術(shù)的發(fā)展已有20多年歷史。由原華中工學(xué)院和武漢733廠于1984年共同完成的精神模CAD/CAM系統(tǒng)是我國第一個自行開發(fā)的模具CAD/CAM系統(tǒng)。由華中工學(xué)院和北京模具廠等于1986年共同完成的冷沖模CAD/CAM系統(tǒng)是我國自行開發(fā)的第一個沖裁模CAD/CAM系統(tǒng)。上海交通大學(xué)開發(fā)的冷沖模CAD/CAM系統(tǒng)也于同年完成。20世紀(jì)90年代以來，國內(nèi)汽車行業(yè)的模具設(shè)計制造中開始采用CAD/CAM技術(shù)。國家科委863計劃將東風(fēng)汽車公司作為CIMS應(yīng)用示范工廠，由華中理工大學(xué)作為技術(shù)依托單位，開發(fā)的汽車車身與覆蓋模具CAD/CAPP/CAM集成系統(tǒng)于1996年初通過鑒定。在此期間，一汽和成飛汽車模具中心引進(jìn)了工作站和CAD/CAM軟件系統(tǒng)，并在模具設(shè)計制造中實際應(yīng)用，取得了顯著效益。1997年一汽引進(jìn)了板料成型過程計算機模擬CAE軟件并開始用于生產(chǎn)。21世紀(jì)開始CAD/CAM技術(shù)逐漸普及，現(xiàn)在具有一定生產(chǎn)能力的沖壓模具企業(yè)基本都有了CAD/CAM技術(shù)。其中部分骨干重點企業(yè)還具備各CAE能力。 模具CAD/CAM技術(shù)能顯著縮短模具設(shè)計與制造周期，降低生產(chǎn)成本，提高產(chǎn)品質(zhì)量，已成為人們的共識。在“八五”、九五“期間，已有一大批模具企業(yè)推廣普及了計算機繪圖技術(shù)，數(shù)控加工的使用率也越來越高，并陸續(xù)引進(jìn)了相當(dāng)數(shù)量CAD/CAM系統(tǒng)。如美國EDS的UG，美國Parametric Technology公司 Pro/Engineer，美國CV公司的CADSS，英國DELCAM公司的DOCT5，日本HZS公司的CRADE及space-E, 以色列公司的Cimatron 還引進(jìn)了AutoCAD CATIA 等軟件及法國Marta-Daravision公司用于汽車及覆蓋件模具的Euclid-IS等專用軟件。 2.沖壓模具行業(yè)發(fā)展現(xiàn)狀及技術(shù)趨勢 改革開放以來，隨著國民經(jīng)濟的高速發(fā)展，市場對模具的需求量不斷增長。近年來，模具工業(yè)一直以15%左右的增長速度快速發(fā)展，模具工業(yè)企業(yè)的所有制成分也發(fā)生了巨大變化，除了國有專業(yè)模具廠外，集體、合資、獨資和私營也得到了快速發(fā)展。浙江寧波和黃巖地區(qū)的“模具之鄉(xiāng)”；廣東一些大集團(tuán)公司和迅速崛起的鄉(xiāng)鎮(zhèn)企業(yè)，科龍、美的、康佳等集團(tuán)紛紛建立了自己的模具制造中心；中外合資和外商獨資的模具企業(yè)現(xiàn)已有幾千家。 近年許多模具企業(yè)加大了用于技術(shù)進(jìn)步的投資力度，將技術(shù)進(jìn)步視為企業(yè)發(fā)展的重要動力。一些國內(nèi)模具企業(yè)已普及了二位CAD，并陸續(xù)開始使用UG、Pro/Engineer等， 文獻(xiàn)綜述 個別廠家還引進(jìn)了Moldflow、C-Flow、DYNAFORM、Optris和MAGMASOFT等CAE軟件，并成功應(yīng)用于沖壓模的設(shè)計中。 以汽車覆蓋件模具為代表的大型沖壓模具的制造技術(shù)已取得很大進(jìn)步，東風(fēng)汽車公司模具廠、一汽模具中心等模具廠家已能生產(chǎn)部分轎車覆蓋件模具。此外，許多研究機構(gòu)和大專院校開展模具技術(shù)的研究和開發(fā)。經(jīng)過多年的努力，在模具CAD/CAE/CAM技術(shù)方面取得了顯著進(jìn)步；在提高模具質(zhì)量和縮短模具設(shè)計制造周期等方面做出了貢獻(xiàn)。例如，吉林大學(xué)汽車覆蓋件成型技術(shù)所獨立研制的汽車覆蓋件沖壓成型分析KMAS軟件，華中理工大學(xué)模具技術(shù)國家重點實驗室開發(fā)的注塑模、汽車覆蓋件模具和級進(jìn)模CAD/CAE/CAM軟件，上海交通大學(xué)模具CAD國家工程研究中心開發(fā)的冷沖模和精沖研究中心開發(fā)的冷沖模和精沖模CAD軟件等在國內(nèi)模具行業(yè)擁有不少的用戶。雖然中國模具工業(yè)在過去十多年中取得了令人矚目的發(fā)展，但許多方面與工業(yè)發(fā)達(dá)國家相比仍有較大的差距。例如，精密加工設(shè)備在模具加工設(shè)備中的比重比較低；CAD/CAE/CAM技術(shù)的普及率不高；許多先進(jìn)的模具技術(shù)應(yīng)用不夠廣泛等等，致使相當(dāng)一部分大型、精密、復(fù)雜和長壽命模具依賴進(jìn)口。 未來沖壓模具制造技術(shù)發(fā)展趨勢模具技術(shù)的發(fā)展應(yīng)該為適應(yīng)模具產(chǎn)品“交貨期短”、“精度高”、“質(zhì)量好”、“價格低”的要求服務(wù)。 3.我國模具水平與國際先進(jìn)水平的差距 近幾年，我國模具發(fā)展雖然駛?cè)肓丝燔嚨?，我國模具特別是中低檔模具在國際市場上存在著較大的價格優(yōu)勢，有的模具價格甚至只有國際市場的幾分之一，再加之我國低廉的優(yōu)質(zhì)勞動力資源、較好的技術(shù)基礎(chǔ)和基礎(chǔ)配套設(shè)施，到中國來采購模具的跨國公司越來越多。據(jù)統(tǒng)計，幾年前，全球近60％的模具由歐美等國家生產(chǎn)，但是近幾年，隨著亞洲模具市場的發(fā)展，其生產(chǎn)模具的比例正在不斷上升，“中國模具”也正走向世界舞臺。 我們必須意識到，對模具設(shè)計的研究的目的和意義在于能夠更好的認(rèn)識模具工業(yè)在國民經(jīng)濟中的地位的重要性。因為利用模具成型零件的方法，實質(zhì)上是一種少切削、無切削、多工序重合的生產(chǎn)方法，采用模具成型的工藝代替?zhèn)鹘y(tǒng)的切削加工工藝，可以提高生產(chǎn)效率，保證零件質(zhì)量，節(jié)約材料，降低生產(chǎn)成本，從而取得很高的經(jīng)濟效益。利用模具生產(chǎn)零件的方法已經(jīng)成為工業(yè)上進(jìn)行成批或大批生產(chǎn)的主要技術(shù)手段，它對保證制品質(zhì)量，縮短試用周期，進(jìn)而爭先占領(lǐng)市場，以及產(chǎn)品更新?lián)Q代和新產(chǎn)品開發(fā)都具有決定性的意義。因此模具工業(yè)被認(rèn)為是國民經(jīng)濟的基礎(chǔ)工業(yè)，德國把模具稱為“金屬加工中的帝王”，把模具工業(yè)視為“關(guān)鍵工業(yè)”，美國把模具稱為“美國工業(yè)的基石”，把模具工業(yè)視為“不可估量其力量的工業(yè)”，日本把模具說成是“促進(jìn)社會富裕繁榮的動力”，把模具視為“整個工業(yè)發(fā)展的秘密”，國際模具協(xié)會認(rèn)為：“模具是進(jìn)入富裕社會的原動力”。 參考文獻(xiàn) [1]盧險峰.沖壓工藝模具學(xué)[Ｍ].北京：機械工業(yè)出版社 ,2006：60～91 [2]郭鐵良. 模具制造工藝學(xué)[Ｍ].北京:高等教育出社 ,2002：126～165 [3]彭曉蘭,高靖. 機械制圖與計算機繪圖(上冊)[Ｍ].南昌：江西高校出版社,2004：43～88 [4]陳孝康，陳炎嗣，周興隆.實用模具技術(shù)手冊[Ｍ].北京:中國輕工業(yè)出版社, 2001：33～77 [5]馮炳堯，韓泰榮，蔣文森.模具設(shè)計與制造簡明手冊(第二版)[Ｍ].上海:上?？茖W(xué)技術(shù)出版社, 1998：90～123　 [6]徐政坤.沖壓模具設(shè)計與制造[Ｍ].北京：化學(xué)工業(yè)出版社，2006:102～165 [7]李體彬. 沖壓成形工藝[Ｍ].南昌:化學(xué)工業(yè)出版社，2008:22～76 [8]楊占堯.沖壓模具圖冊[Ｍ].北京：高等教育出版社，2006：44～87 [9]薛啟翔.新編沖壓工計算手冊[Ｍ].南昌:機械工業(yè)出版社，2006：54～98 [10]張長春，王金國，宣兆志，李笑明.材料成型工藝學(xué)[Ｍ].吉林：吉林大學(xué)出版社，2006:201～280 [11] Shu Le.Metal forming handbook[J].Higher Education Press,2004:123～223 [12] Shen Yan Jin. Zhou Gang.English mold - mold design and manufacture of professional English planning materials[J]. Mechanical Industry Press,2009:100～134 研究內(nèi)容 1．設(shè)計、研究思路 本次設(shè)計按照工藝分析——工藝方案確定——模具結(jié)構(gòu)設(shè)計的思路進(jìn)行。 2．課題研究的主要內(nèi)容 該零件的形狀簡單、工藝性良好，可以用復(fù)合模一次性沖孔、落料即可,故該零件采用復(fù)合模進(jìn)行加工，只需一副模具，沖壓件的形狀精度和尺寸精度容易保證，生產(chǎn)效率高，且自動化程度高。此模具不采用側(cè)壓裝置，為了補償因進(jìn)料過程中條料擺動而導(dǎo)致的側(cè)面搭邊值的減小，條料寬度應(yīng)增加一個擺動量。驅(qū)動橋鎖零件圖如圖2所示： 厚度：t=1.5mm 圖2 驅(qū)動橋鎖零件圖 該零件包括落料、沖孔兩個基本工序，可以采用以下三種工藝方案: ①先落料，再沖孔，采用單工序模生產(chǎn). ②落料一沖孔復(fù)合沖壓，采用復(fù)合模生產(chǎn). ③沖孔一落料連續(xù)沖壓，采用級進(jìn)模生產(chǎn). 方案①模具結(jié)構(gòu)簡單，但需要兩道工序、兩套模具才能完成零件的加工，生產(chǎn)效率較低，難以滿足零件大批量生產(chǎn)的需求.由于零件結(jié)構(gòu)簡單，為提高生產(chǎn)效率，主要應(yīng)采用復(fù)合沖裁或級進(jìn)沖裁方式。 方案②只需要一套模具，沖壓件的形位精度和尺寸易于保證，且生產(chǎn)效率也高。 盡管模具結(jié)構(gòu)較方案一復(fù)雜，但由于零件的幾何形狀簡單對稱，模具制造并不困難。 方案③也只需要一套模具，生產(chǎn)效率也很高，但零件的沖壓精度較復(fù)合模的低。 方案③也只需要一套模具，生產(chǎn)效率也很高，但零件的沖壓精度較復(fù)合模的低。欲保證沖壓件的形位精度，通過以上三種方案的分析比較，對該見沖壓生產(chǎn)以采用放案②為佳。 欲保證沖壓件的形位精度，通過以上三種方案的分析比較，對該件沖壓生產(chǎn)以采用方案②為佳。 采用復(fù)合沖裁或級進(jìn)沖裁方式。  研究內(nèi)容 3．解決的關(guān)鍵問題 本沖壓件一次性沖孔、落料即可，相應(yīng)部位有倒角。有可能遇到的主要問題： 1）沖壓件工藝分析； 2）確定工藝方案； 3）工藝計算； 4）模具總體設(shè)計和主要零件設(shè)計； 5）橡膠的選用； 6）模架的選用； 7）沖壓件材料的合理選用； 8）沖壓件成型過程分析。 這些問題都是設(shè)計該模具的關(guān)鍵問題，在設(shè)計過程中，本人將通過查閱有關(guān)文獻(xiàn)資料來解決。 4．預(yù)期成果 （1）產(chǎn)品零件二維圖、三維造型圖； （2）開題報告一份；（畢業(yè)設(shè)計的內(nèi)容和意義、文獻(xiàn)綜述、研究內(nèi)容、研究計劃、特色與創(chuàng)新） （3）模具裝配圖及各零件圖； （4）設(shè)計說明書一份及光盤。  研究計劃 第1-2周 1、熟悉課題，查閱并收集有關(guān)資料，為寫開題報告做準(zhǔn)備； 2、繪制產(chǎn)品零件圖； 3、完成工藝性分析，提出設(shè)計方案； 第3-4周 1、寫出開題報告初稿； 2、完成工藝計算； 3、完成模具零件結(jié)構(gòu)形式確定及設(shè)計，選擇設(shè)備； 第5-6周 1、第4周完成開題報告的最后定稿； 2、繪制模具草圖； 第7-9周 繪制模具裝配圖及各設(shè)計件零件圖 第10-11周 編寫設(shè)計說明書，打印并準(zhǔn)備答辯 第12周 打印畢業(yè)設(shè)計資料并準(zhǔn)備答辯 特色與創(chuàng)新 在本次畢業(yè)設(shè)計，本人將嘗試CAD/CAE/CAM技術(shù)來設(shè)計與制造模具。在模具設(shè)計方面，應(yīng)用DEFORM軟件對成型過程進(jìn)行分析，從而優(yōu)化了模具結(jié)構(gòu)。由于學(xué)習(xí)該軟件需要一定的沖壓件成型實踐知識，在使用上要多查閱這方面的資料。 指導(dǎo)教師 意 見 指導(dǎo)教師簽名： 2012年3月2 日 教研室 意 見 主任簽名： 2012年3月4 日 學(xué)院意見 教學(xué)院長簽名： 2012年3月5日