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畢業(yè)設(shè)計(jì)附本
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
SCREW CONVEYOR MECHANISM DESIGN
學(xué)生姓名
班 級(jí)
學(xué) 號(hào)
學(xué)院名稱
專業(yè)名稱
指導(dǎo)教師
年
5 月
30 日
目 錄
畢業(yè)設(shè)計(jì)(論文)課題申報(bào)表 1
畢 業(yè) 設(shè) 計(jì)(論 文) 任 務(wù) 書 2
畢業(yè)設(shè)計(jì)(論文)開題報(bào)告 5
畢業(yè)設(shè)計(jì)(論文)指導(dǎo)手冊(cè) 10
學(xué)生畢業(yè)設(shè)計(jì)(論文)中期匯報(bào)表 15
學(xué)生畢業(yè)設(shè)計(jì)(論文)中期情況檢查表 16
畢業(yè)設(shè)計(jì)(論文)指導(dǎo)教師評(píng)閱表 17
畢業(yè)設(shè)計(jì)(論文)評(píng)閱教師評(píng)閱表 18
畢業(yè)設(shè)計(jì)(論文)答辯及綜合成績?cè)u(píng)定表 19
外文翻譯 20
畢業(yè)設(shè)計(jì)(論文)課題申報(bào)表
指導(dǎo)教師
職稱
副教授
教研室
機(jī)械設(shè)計(jì)制造及其自動(dòng)化
申報(bào)課題名稱
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
課題類型
工程設(shè)計(jì)類
課題來源
B.社會(huì)生產(chǎn)實(shí)踐
課
題
簡
介
螺旋輸送機(jī)俗稱絞龍,是一種無撓性牽引構(gòu)件的連續(xù)輸送設(shè)備,它借助旋轉(zhuǎn)螺旋輸送葉片的推力將物料沿著機(jī)槽進(jìn)行輸送。螺旋輸送機(jī)對(duì)輸送粉狀、粒狀和小塊狀物料,如:水泥、煤粉、糧食、化肥、灰渣、砂子等,螺旋機(jī)不宜輸送易變質(zhì)的、粘性大的、易結(jié)塊的物料。因?yàn)檫@些物料在輸送時(shí)會(huì)粘結(jié)在螺旋上,并隨之旋轉(zhuǎn)而不向前移動(dòng),形成物料的積塞而使螺旋機(jī)不能正常工作。主要完成各參數(shù)設(shè)計(jì)計(jì)算,各主要結(jié)構(gòu)的設(shè)計(jì)計(jì)算,Pro/E三維建模。
課題要求
(包括所具備的條件)
1.學(xué)生應(yīng)具備機(jī)械設(shè)計(jì)制造方面的基礎(chǔ)知識(shí)和工程軟件AutoCAD、UG或Pro/E等的基本操作能力;
2.要求學(xué)習(xí)態(tài)度端正、責(zé)任心強(qiáng),具有較強(qiáng)的文獻(xiàn)查詢、整理、消化能力。
課題工作量要求
1.與課題相關(guān)的英文文獻(xiàn)翻譯不少于4000詞;
2.設(shè)計(jì)論文(說明書)的字?jǐn)?shù)不少于12000字,紙張不少于30頁;
3.畢業(yè)答辯圖紙若干,達(dá)到設(shè)計(jì)任務(wù)要求;
4.參考文獻(xiàn)不少于15篇(其中包含2篇英文文獻(xiàn))。
教研室
審定意見
同意
教研室主任簽字:
學(xué) 院
審定意見
同意
教學(xué)院長簽字:
畢 業(yè) 設(shè) 計(jì)(論 文) 任 務(wù) 書
學(xué)院(系):
機(jī)電工程學(xué)院
專??? ??業(yè):
機(jī)械設(shè)計(jì)制造及其自動(dòng)化
學(xué)生姓名:
學(xué) ? 號(hào):
設(shè)計(jì)(論文)
題目:
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
起 迄 日 期:
2018年 2月 26日~ 2018年 5月26日
指 導(dǎo) 教 師:
教研室主任:
發(fā)任務(wù)書日期: 年 3月 4日
畢 業(yè) 設(shè) 計(jì)(論 文)任 務(wù) 書
1.畢業(yè)設(shè)計(jì)的背景:
螺旋輸送機(jī)俗稱絞龍,是一種無撓性牽引構(gòu)件的連續(xù)輸送設(shè)備,它借助旋轉(zhuǎn)螺旋輸送葉片的推力將物料沿著機(jī)槽進(jìn)行輸送。螺旋輸送機(jī)對(duì)輸送粉狀、粒狀和小塊狀物料,如:水泥、煤粉、糧食、化肥、灰渣、砂子等,螺旋機(jī)不宜輸送易變質(zhì)的、粘性大的、易結(jié)塊的物料。因?yàn)檫@些物料在輸送時(shí)會(huì)粘結(jié)在螺旋上,并隨之旋轉(zhuǎn)而不向前移動(dòng),形成物料的積塞而使螺旋機(jī)不能正常工作。
2.畢業(yè)設(shè)計(jì)(論文)的內(nèi)容和要求:
內(nèi)容:主要完成各參數(shù)設(shè)計(jì)計(jì)算,各主要結(jié)構(gòu)的設(shè)計(jì)計(jì)算,Pro/E三維建模,總裝配圖,主要零件的零件圖。
要求:1.學(xué)生應(yīng)具備機(jī)械設(shè)計(jì)制造方面的基礎(chǔ)知識(shí)和工程軟件AutoCAD、UG或Pro/E等的基本操作能力;2.要求學(xué)習(xí)態(tài)度端正、責(zé)任心強(qiáng),具有較強(qiáng)的文獻(xiàn)查詢、整理、消化能力。
3.主要參考文獻(xiàn):
[1]朱里.機(jī)械原理[M].北京: 高等教育出版社, 2010.
[2]濮良貴.機(jī)械設(shè)計(jì)[M].北京:高等教育出版社, 2014.
[3]邢邦圣.機(jī)械制圖與計(jì)算機(jī)繪圖[M].北京:化學(xué)工業(yè)出版社, 2011.
[4]陳秀寧.機(jī)械設(shè)計(jì)課程設(shè)計(jì)[M].浙江:浙江大學(xué)出版社, 2012.
[5]機(jī)械設(shè)計(jì)手冊(cè)編委會(huì).機(jī)械設(shè)計(jì)手冊(cè)(新版)[M].北京:機(jī)械工業(yè)出版社,2004.
4.畢業(yè)設(shè)計(jì)(論文)進(jìn)度計(jì)劃(以周為單位):
第1周 查閱資料、英文翻譯;
第2周 撰寫開題報(bào)告;
第3周 總體結(jié)構(gòu)設(shè)計(jì);
第4周 各參數(shù)設(shè)計(jì)計(jì)算;
第5、6周 各部分零件結(jié)構(gòu)設(shè)計(jì)計(jì)算、強(qiáng)度計(jì)算;
第7周 部分零件零件圖繪制;
第8周 完成總裝配圖;
第9~11周 撰寫畢業(yè)設(shè)計(jì)說明書初稿、查重;
第12周 修改畢業(yè)設(shè)計(jì)說明書、定稿;
第13周 準(zhǔn)備答辯。
教研室審查意見:
教研室主任簽名: 年 月 日
學(xué)院審查意見:
教學(xué)院長簽名: 年 月 日
畢業(yè)設(shè)計(jì)(論文)開題報(bào)告
課題名稱:
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
學(xué)生姓名:
學(xué)號(hào):
指導(dǎo)教師:
職稱:
所在學(xué)院:
機(jī)電工程學(xué)院
專業(yè)名稱:
機(jī)械設(shè)計(jì)制造及其自動(dòng)化
日期: 年 3 月 16 日
說 明
1.根據(jù)《畢業(yè)設(shè)計(jì)(論文)管理規(guī)定》,學(xué)生必須撰寫《畢業(yè)設(shè)計(jì)(論文)開題報(bào)告》,由指導(dǎo)教師簽署意見、教研室審查,學(xué)院教學(xué)院長批準(zhǔn)后實(shí)施。
2.開題報(bào)告是畢業(yè)設(shè)計(jì)(論文)答辯委員會(huì)對(duì)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(jì)(論文)工作前期內(nèi)完成,開題報(bào)告不合格者不得參加答辯。
3.畢業(yè)設(shè)計(jì)開題報(bào)告各項(xiàng)內(nèi)容要實(shí)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(shí)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(bào)告中,由學(xué)生本人撰寫的對(duì)課題和研究工作的分析及描述,沒有經(jīng)過整理歸納,缺乏個(gè)人見解僅僅從網(wǎng)上下載材料拼湊而成的開題報(bào)告按不合格論。
5.課題類型填:工程設(shè)計(jì)類;理論研究類;應(yīng)用(實(shí)驗(yàn))研究類;軟件設(shè)計(jì)類;其它。
6.課題來源填:教師科研;社會(huì)生產(chǎn)實(shí)踐;教學(xué);其它
畢業(yè)設(shè)計(jì)(論文)開題報(bào)告
課題名稱
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
課題來源
B.社會(huì)生產(chǎn)實(shí)踐
課題類型
工程設(shè)計(jì)類
1.選題的背景及意義:
螺旋輸送機(jī)俗稱絞龍,是一種無撓性牽引構(gòu)件的連續(xù)輸送設(shè)備,它借助旋轉(zhuǎn)螺旋輸送葉片的推力將物料沿著機(jī)槽進(jìn)行輸送。螺旋輸送機(jī)對(duì)輸送粉狀、粒狀和小塊狀物料,如:水泥、煤粉、糧食、化肥、灰渣、砂子等,螺旋機(jī)不宜輸送易變質(zhì)的、粘性大的、易結(jié)塊的物料。因?yàn)檫@些物料在輸送時(shí)會(huì)粘結(jié)在螺旋上,并隨之旋轉(zhuǎn)而不向前移動(dòng),形成物料的積塞而使螺旋機(jī)不能正常工作。
2.研究內(nèi)容擬解決的主要問題:
(1) 螺旋運(yùn)輸機(jī)結(jié)構(gòu)方案的確定,參考收集的資料,提出不同的方案進(jìn)行比較,選擇比較優(yōu)化的一種;
(2)螺旋運(yùn)輸機(jī)的設(shè)計(jì)計(jì)算:由于此設(shè)計(jì)計(jì)算比較成熟,可根據(jù)運(yùn)輸機(jī)械設(shè)計(jì)選用手冊(cè)所提供的計(jì)算公式和限制條件,對(duì)輸送量、螺旋軸轉(zhuǎn)速、螺旋葉片直徑、螺距、螺旋軸直徑、填充系數(shù)、傾斜角及傳動(dòng)功率進(jìn)行計(jì)算,并根據(jù)這些條件進(jìn)一步確定螺旋運(yùn)輸機(jī)的結(jié)構(gòu)和幾何尺寸,在確定螺旋運(yùn)輸機(jī)的主要參數(shù)時(shí),要從其輸送機(jī)理、物料的特性等方面著手,盡可能進(jìn)行多種試驗(yàn),取得一些設(shè)計(jì)參數(shù),從而設(shè)計(jì)出比較符合實(shí)際情況的螺旋運(yùn)輸機(jī);
(3)減速器的設(shè)計(jì)計(jì)算:決定傳動(dòng)裝置的總體設(shè)計(jì)方案;選擇電動(dòng)機(jī);計(jì)算傳動(dòng)裝置的運(yùn)動(dòng)和動(dòng)力參數(shù);傳動(dòng)零件、軸的設(shè)計(jì)計(jì)算;軸承、聯(lián)接件、潤滑密封和兩周期的選擇及校驗(yàn)計(jì)算;機(jī)體結(jié)構(gòu)及其附件的設(shè)計(jì)。
3.研究方法技術(shù)路線:
主要研究方法:首先通過計(jì)算機(jī)進(jìn)行查閱,對(duì)螺旋運(yùn)輸機(jī)進(jìn)行了解,了解各項(xiàng)數(shù)據(jù)之后再對(duì)材料和電機(jī)進(jìn)行選擇,再通過查閱書籍、計(jì)算機(jī)等工具對(duì)要設(shè)計(jì)的各項(xiàng)數(shù)據(jù)進(jìn)行整理、調(diào)整,最終完成設(shè)計(jì)。
在傳統(tǒng)設(shè)計(jì)的基礎(chǔ)上,借用計(jì)算機(jī)輔助設(shè)計(jì)軟件進(jìn)行,繪制三維零件圖及二維零件圖,并進(jìn)行虛擬裝配,并生成對(duì)應(yīng)的工程圖。
4.研究的總體安排和進(jìn)度計(jì)劃:
第1周 查閱資料、英文翻譯;
第2周 撰寫開題報(bào)告;
第3周 總體結(jié)構(gòu)設(shè)計(jì);
第4周 各參數(shù)設(shè)計(jì)計(jì)算;
第5、6周 各部分零件結(jié)構(gòu)設(shè)計(jì)計(jì)算、強(qiáng)度計(jì)算;
第7周 部分零件零件圖繪制;
第8周 完成總裝配圖;
第9~11周 撰寫畢業(yè)設(shè)計(jì)說明書初稿、查重;
第12周 修改畢業(yè)設(shè)計(jì)說明書、定稿;
第13周 準(zhǔn)備答辯。
5.主要參考文獻(xiàn):
[1]朱里.機(jī)械原理[M].北京: 高等教育出版社, 2010.
[2]濮良貴.機(jī)械設(shè)計(jì)[M].北京:高等教育出版社, 2014.
[3]邢邦圣.機(jī)械制圖與計(jì)算機(jī)繪圖[M].北京:化學(xué)工業(yè)出版社, 2011.
[4]陳秀寧.機(jī)械設(shè)計(jì)課程設(shè)計(jì)[M].浙江:浙江大學(xué)出版社, 2012.
[5]機(jī)械設(shè)計(jì)手冊(cè)編委會(huì).機(jī)械設(shè)計(jì)手冊(cè)(新版)[M].北京:機(jī)械工業(yè)出版社,2004.
[6]中國農(nóng)業(yè)機(jī)械化科學(xué)研究院.實(shí)用機(jī)械設(shè)計(jì)手冊(cè)[K].北京:中國農(nóng)業(yè)機(jī)械出版社, 1985:231-244.
[7]胡家秀,簡明機(jī)械零件設(shè)計(jì)實(shí)用手冊(cè)北京:機(jī)械工業(yè)出版社,1999.10
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[10]黃石茂. 螺旋輸送機(jī)輸送機(jī)理及其主要參數(shù)的確[J]. 廣東造紙, 1998(3):27-31.)
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[12] 洪致育、林良明主編. 連續(xù)運(yùn)輸機(jī). 北京:機(jī)械工業(yè)出版社,1982.
[13] 杜君文主編.機(jī)械制造技術(shù)裝備及設(shè)計(jì).天津大學(xué)出版社,1998.
[14] 毛廣卿主編.糧食輸送機(jī)械與應(yīng)用.北京:科學(xué)出版社,2003.
[15] 王文麗.螺旋輸送機(jī)在糧食鋼板倉中的改進(jìn)應(yīng)用[J].安陽大正鋼板倉有限責(zé) 任公司,2014.
[17] 劉海軍.螺旋輸送機(jī)參數(shù)設(shè)計(jì)系統(tǒng)的開發(fā)[J].東北農(nóng)業(yè)大學(xué),2012.
[18] 中國礦業(yè)大學(xué). 礦山運(yùn)輸機(jī)械[J]. 煤礦工業(yè)出版社,1987.1.
[19]Tugomir Surina, Clyde Herrick. Semiconductor Electronics. Copyright 1964 by Holt, Rinehart and Winston, Inc., 120~250
[20]Colby R.S.A State Analysis of LCI fed Synchronous Motor Drive System. IEEE Trans, 1984, 21(4):6~8
指導(dǎo)教師意見:
對(duì)“文獻(xiàn)綜述”的評(píng)語:文獻(xiàn)查閱完整,兼顧中文與外文文獻(xiàn),能夠滿足設(shè)計(jì)基本需求。 對(duì)總體安排和進(jìn)度計(jì)劃的評(píng)語研究的總體安排和進(jìn)度計(jì)劃合理,同意開題。
指導(dǎo)教師簽名: 年 月 日
教研室意見:
通過,同意開題
教研室主任簽名: 年 月 日
學(xué)院意見:
教學(xué)院長簽名: 年 月 日
畢業(yè)設(shè)計(jì)(論文)指導(dǎo)手冊(cè)
設(shè)計(jì)(論文)題目 螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
學(xué)生姓名 學(xué)號(hào)
年 級(jí) 2014級(jí) 專業(yè)(全稱) 機(jī)械設(shè)計(jì)制造及其自動(dòng)化
指導(dǎo)教師 所在學(xué)院 機(jī)電工程學(xué)院
畢業(yè)設(shè)計(jì)(論文)指導(dǎo)記錄
第一次指導(dǎo)記錄:
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第四次指導(dǎo)記錄:
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第六次指導(dǎo)記錄:
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第七次指導(dǎo)記錄:
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第八次指導(dǎo)記錄:
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第九次指導(dǎo)記錄:
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第十次指導(dǎo)記錄:
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第十一次指導(dǎo)記錄:
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第十二次指導(dǎo)記錄:
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第十三次指導(dǎo)記錄:
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第十四次指導(dǎo)記錄:
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第十五次指導(dǎo)記錄:
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學(xué)生畢業(yè)設(shè)計(jì)(論文)中期匯報(bào)表
學(xué)生姓名
專 業(yè)
機(jī)械設(shè)計(jì)制造及其
自動(dòng)化
學(xué) 號(hào)
設(shè)計(jì)(論文)題目
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
畢業(yè)設(shè)計(jì)(論文)前期工作小結(jié)
1、簡述開題以來所做的具體工作和取得的進(jìn)展或成果
(1)收集有關(guān)螺旋運(yùn)輸機(jī)的資料,為后續(xù)設(shè)計(jì)做準(zhǔn)備;
(2)完成開題報(bào)告、外文文獻(xiàn)及其翻譯;
(3)確定螺旋運(yùn)輸機(jī)的布置形式;
(4)根據(jù)載荷確定電機(jī)功率;
(5)對(duì)一部分的螺旋運(yùn)輸機(jī)進(jìn)行選型。
2 設(shè)計(jì)中遇到的問題
在設(shè)計(jì)過程中對(duì)于一些計(jì)算參數(shù)的查表不是很靈活、對(duì)于三維軟件的使用也不是很得心應(yīng)手。在繪制二維圖時(shí),對(duì)一些制圖標(biāo)準(zhǔn)也很模糊。
3 下一步主要任務(wù)
(1) 根據(jù)電機(jī)的功率和螺旋運(yùn)輸機(jī)所需的轉(zhuǎn)速確定減速機(jī);
(2) 完成剩余部分螺旋運(yùn)輸機(jī)的選型;
(3) 查找螺旋運(yùn)輸機(jī)安裝和維護(hù)的資料;
(4) 繪制二維圖和三維圖。
指導(dǎo)教師意見
該生前期已完成的工作基本上與畢業(yè)設(shè)計(jì)任務(wù)書以及開題報(bào)告中要求的內(nèi)容基本相吻合,整體完成情況良好。
簽名:
年 月 日
學(xué)生畢業(yè)設(shè)計(jì)(論文)中期情況檢查表
學(xué)院名稱: 機(jī)電工程學(xué)院 檢查日期: 2018年 4月 24日
學(xué)生姓名
專 業(yè)
機(jī)械設(shè)計(jì)及其自動(dòng)化
指導(dǎo)教師
設(shè)計(jì)(論文)題目
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
工作進(jìn)度情況
通過查閱相關(guān)的專業(yè)資料,完成了開題報(bào)告的撰寫任務(wù);完成了外文翻譯;對(duì)螺旋輸送機(jī)機(jī)械結(jié)構(gòu)的總體方案進(jìn)行了設(shè)計(jì),并對(duì)各部件進(jìn)行了選用、計(jì)算和強(qiáng)度校核;符合任務(wù)書進(jìn)度要求。
是否符合任務(wù)書要求進(jìn)度
是
能否按期完成任務(wù)
能
工作態(tài)度情況
(態(tài)度、紀(jì)律、出勤、主動(dòng)接受指導(dǎo)等)
該同學(xué)工作態(tài)度認(rèn)真、端正,設(shè)計(jì)嚴(yán)謹(jǐn)、出勤率高、能夠按時(shí)主動(dòng)接受指導(dǎo),有較強(qiáng)的自主學(xué)習(xí)能力,能夠及時(shí)完成設(shè)計(jì)任務(wù),對(duì)不能解決的問題能及時(shí)向同學(xué)和老師求教。
質(zhì)量
評(píng)價(jià)
(針對(duì)已完成的部分)
該生前期已完成的工作基本上與畢業(yè)設(shè)計(jì)任務(wù)書以及開題報(bào)告中要求的內(nèi)容基本相吻合,整體完成情況良好。
存在問題和解決辦法
繼續(xù)查閱相關(guān)資料,豐富設(shè)計(jì)思路,修改完善設(shè)計(jì)中存在的問題;對(duì)二維軟件還需進(jìn)一步學(xué)習(xí)。
檢查人簽名
教學(xué)院長簽名
畢業(yè)設(shè)計(jì)(論文)指導(dǎo)教師評(píng)閱表
學(xué)院: 機(jī)電工程學(xué)院 專業(yè): 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 學(xué)生: 學(xué)號(hào):
題目: ? 機(jī)械設(shè)計(jì)及其自動(dòng)化 ?
評(píng)價(jià)
項(xiàng)目
評(píng)價(jià)要素
成績?cè)u(píng)定
優(yōu)
良
中
及格
不及格
工作
態(tài)度
工作態(tài)度認(rèn)真,按時(shí)出勤
能按規(guī)定進(jìn)度完成設(shè)計(jì)任務(wù)
選題
質(zhì)量
選題方向和范圍
選題難易度
選題理論意義和實(shí)際應(yīng)用價(jià)值
能力
水平
查閱和應(yīng)用文獻(xiàn)資料能力
綜合運(yùn)用知識(shí)能力
研究方法與手段
實(shí)驗(yàn)技能和實(shí)踐能力
創(chuàng)新意識(shí)
設(shè)計(jì)
論文
質(zhì)量
內(nèi)容與寫作
結(jié)構(gòu)與水平
規(guī)范化程度
成果與成效
指導(dǎo)
教師
意見
建議成績
是否同意參加答辯
評(píng)語:
? ?
? ?
? ?
指導(dǎo)教師簽名:
年 月 日
畢業(yè)設(shè)計(jì)(論文)評(píng)閱教師評(píng)閱表
學(xué)院: 機(jī)電工程學(xué)院 專業(yè): 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 學(xué)生: 學(xué)號(hào):
題目: ? ?螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)????
評(píng)價(jià)
項(xiàng)目
評(píng)價(jià)要素
成績?cè)u(píng)定
優(yōu)
良
中
及格
不及格
選題
質(zhì)量
選題方向和范圍
選題難易度
選題理論意義和實(shí)際應(yīng)用價(jià)值
能力
水平
查閱和應(yīng)用文獻(xiàn)資料能力
綜合運(yùn)用知識(shí)能力
研究方法與手段
實(shí)驗(yàn)技能和實(shí)踐能力
創(chuàng)新意識(shí)
設(shè)計(jì)
論文
質(zhì)量
內(nèi)容與寫作
結(jié)構(gòu)與水平
規(guī)范化程度
成果與成效
評(píng)閱
教師
意見
建議成績
是否同意參加答辯
評(píng)語:
? ?
? ?
? ?
評(píng)閱教師簽名:
年 月 日
畢業(yè)設(shè)計(jì)(論文)答辯及綜合成績?cè)u(píng)定表
學(xué) 院
機(jī)電工程學(xué)院
專 業(yè)
機(jī)械設(shè)計(jì)制造及其自動(dòng)化
學(xué)生姓名
學(xué) 號(hào)
指導(dǎo)教師
設(shè)計(jì)論文題 目
螺旋運(yùn)輸機(jī)機(jī)械結(jié)構(gòu)設(shè)計(jì)
答辯時(shí)間
2018 年 5月28日 8 時(shí) 15分至 8時(shí) 30分
答辯地點(diǎn)
敬本樓C503
答辯小組成 員
姓名
張?jiān)?
石榮玲
孫健
田晶
范天錦
職稱
副教授
教授
副教授
講師
高級(jí)工程師
答辯
記錄
提問人
提問主要內(nèi)容
學(xué)生回答摘要
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
答辯記錄人簽名:
答辯
小組
意見
答辯評(píng)語:
?
?
?
答辯成績:
答辯小組組長簽名:
綜合
成績
評(píng)定
指導(dǎo)教師評(píng)定成績
評(píng)閱教師評(píng)定成績
答辯成績
綜合評(píng)定成績
答辯委員會(huì)主任簽名:
?
年 月 日
畢業(yè)設(shè)計(jì)(論文)
外文翻譯
學(xué)生姓名
班 級(jí)
14機(jī)械單
學(xué) 號(hào)
學(xué)院名稱
機(jī)電工程學(xué)院
專業(yè)名稱
機(jī)械設(shè)計(jì)制造及其自動(dòng)化
指導(dǎo)教師
2018年
5 月
26 日
Basic Machining Operations and Cutting Technology
Basic Machining Operations
Machine tools have evolved from the early foot-powered lathes of the Egyptians and John Wilkinson's boring mill. They are designed to provide rigid support for both the work piece and the cutting tool and can precisely control their relative positions and the velocity of the tool with respect to the work piece. Basically, in metal cutting, a sharpened wedge-shaped tool removes a rather narrow strip of metal from the surface of a ductile work piece in the form of a severely deformed chip. The chip is a waste product that is considerably shorter than the work piece from which it came but with a corresponding increase in thickness of the uncut chip. The geometrical shape of work piece depends on the shape of the tool and its path during the machining operation.
Most machining operations produce parts of differing geometry. If a rough cylindrical work piece revolves about a central axis and the tool penetrates beneath its surface and travels parallel to the center of rotation, a surface of revolution is produced, and the operation is called turning. If a hollow tube is machined on the inside in a similar manner, the operation is called boring. Producing an external conical surface uniformly varying diameter is called taper turning, if the tool point travels in a path of varying radius, a contoured surface like that of a bowling pin can be produced; or, if the piece is short enough and the support is sufficiently rigid, a contoured surface could be produced by feeding a shaped tool normal to the axis of rotation. Short tapered or cylindrical surfaces could also be contour formed.
Flat or plane surfaces are frequently required. They can be generated by radial turning or facing, in which the tool point moves normal to the axis of rotation. In other cases, it is more convenient to hold the work piece steady and reciprocate the tool across it in a series of straight-line cuts with a crosswise feed increment before each cutting stroke. This operation is called planning and is carried out on a shaper. For larger pieces it is easier to keep the tool stationary and draw the work piece under it as in planning. The tool is fed at each reciprocation. Contoured surfaces can be produced by using shaped tools.
Multiple-edged tools can also be used. Drilling uses a twin-edged fluted tool for holes with depths up to 5 to 10 times the drill diameter. Whether the
drill turns or the work piece rotates, relative motion between the cutting edge and the work piece is the important factor. In milling operations a rotary cutter with a number of cutting edges engages the work piece. Which moves slowly with respect to the cutter. Plane or contoured surfaces may be produced, depending on the geometry of the cutter and the type of feed. Horizontal or vertical axes of rotation may be used, and the feed of the work piece may be in any of the three coordinate directions.
Basic Machine Tools
Machine tools are used to produce a part of a specified geometrical shape and precise I size by removing metal from a ductile material in the form of chips. The latter are a waste product and vary from long continuous ribbons of a ductile material such as steel, which are undesirable from a disposal point of view, to easily handled well-broken chips resulting from cast iron. Machine tools perform five basic metal-removal processes: I turning, planning, drilling, milling, and grinding. All other metal-removal processes are modifications of these five basic processes. For example, boring is internal turning; reaming, tapping, and counter boring modify drilled holes and are related to drilling; bobbing and gear cutting are fundamentally milling operations; hack sawing and broaching are a form of planning and honing; lapping, super finishing. Polishing and buffing are variants of grinding or abrasive removal operations. Therefore, there are only four types of basic machine tools, which use cutting tools of specific controllable geometry: 1. lathes, 2. planers, 3. drilling machines, and 4. milling machines. The grinding process forms chips, but the geometry of the abrasive grain is uncontrollable.
The amount and rate of material removed by the various machining processes may be I large, as in heavy turning operations, or extremely small, as in lapping or super finishing operations where only the high spots of a surface are removed.
A machine tool performs three major functions: 1. it rigidly supports the work piece or its holder and the cutting tool; 2. it provides relative motion between the work piece and the cutting tool; 3. it provides a range of feeds and speeds usually ranging from 4 to 32 choices in each case.
Speed and Feeds in Machining
Speeds, feeds, and depth of cut are the three major variables for economical machining. Other variables are the work and tool materials, coolant and geometry of the cutting tool. The rate of metal removal and power required for machining depend upon these variables.
The depth of cut, feed, and cutting speed are machine settings that must be established in any metal-cutting operation. They all affect the forces, the power, and the rate of metal removal. They can be defined by comparing them to the needle and record of a phonograph. The cutting speed (V) is represented by the velocity of- the record surface relative to the needle in the tone arm at any instant. Feed is represented by the advance of the needle radially inward per revolution, or is the difference in position between two adjacent grooves. The depth of cut is the penetration of the needle into the record or the depth of the grooves.
Turning on Lathe Centers
The basic operations performed on an engine lathe are illustrated. Those operations performed on external surfaces with a single point cutting tool are called turning. Except for drilling, reaming, and lapping, the operations on internal surfaces are also performed by a single point cutting tool.
All machining operations, including turning and boring, can be classified as roughing, finishing, or semi-finishing. The objective of a roughing operation is to remove the bulk of the material as rapidly and as efficiently as possible, while leaving a small amount of material on the work-piece for the finishing operation. Finishing operations are performed to obtain the final size, shape, and surface finish on the work piece. Sometimes a semi-finishing operation will precede the finishing operation to leave a small predetermined and uniform amount of stock on the work-piece to be removed by the finishing operation.
Generally, longer work pieces are turned while supported on one or two lathe centers. Cone shaped holes, called center holes, which fit the lathe centers are drilled in the ends of the work piece-usually along the axis of the cylindrical part. The end of the work piece adjacent to the tail stock is always supported by a tail stock center, while the end near the head stock may be supported by a head stock center or held in a chuck. The head stock end of the work piece may be held in a four-jaw chuck, or in a type chuck. This method holds the work piece firmly and transfers the power to the work piece smoothly; the additional support to the work piece provided by the chuck lessens the tendency for chatter to occur when cutting. Precise results can be obtained with this method if care is taken to hold the work piece accurately in the chuck.
Very precise results can be obtained by supporting the work piece between two centers. A lathe dog is clamped to the work piece; together they are driven by a driver plate mounted on the spindle nose. One end of the Work piece is mecained;then the work piece can be turned around in the lathe to machine the other end. The center holes in the work piece serve as precise locating surfaces as well as bearing surfaces to carry the weight of the work piece ?and to resist the cutting forces. After the work piece has been removed from the lathe for any reason, the center holes will accurately align the work piece back in the lathe or in another lathe, or in a cylindrical grinding machine. The work piece must never be held at the head stock end by both a chuck and a lathe center. While at first thought this seems like a quick method of aligning the work piece in the chuck, this must not be done because it is not possible to press evenly with the jaws against the work piece while it is also supported by the center. The alignment provided by the center will not be maintained and the pressure of the jaws may damage the center hole, the lathe center, and perhaps even the lathe spindle. Compensating or floating jaw chucks used almost exclusively on high production work provide an exception to the statements made above. These chucks are really work drivers and cannot be used for the same purpose as ordinary three or four-jaw chucks.
While very large diameter work pieces are sometimes mounted on two centers, they are preferably held at the headstock end by faceplate jaws to obtain the smooth power transmission; moreover, large lathe dogs that are adequate to transmit the power not generally available, although they can be made as a special. Faceplate jaws are like chuck jaws except that they are mounted on a faceplate, which has less overhang from the spindle bearings than a large chuck would have.
Introduction of Machining
Machining as a shape-producing method is the most universally used and the most important of all manufacturing processes. Machining is a shape-producing process in which a power-driven device causes material to be removed in chip form. Most machining is done with equipment that supports both the work piece and cutting tool although in some cases portable equipment is used with unsupported work piece.
Low setup cost for small Quantities. Machining has two applications in manufacturing. For casting, forging, and press working, each specific shape to be produced, even one part, nearly always has a high tooling cost. The shapes that may he produced by welding depend to a large degree on the shapes of raw material that are available. By making use of generally high cost equipment but without special tooling, it is possible, by machining; to start with nearly any form of raw material, so tong as the exterior dimensions are great enough, and produce any desired shape from any material. Therefore .mac