鋼筋自動折彎機的結構設計
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畢業(yè)設計(論文)開題報告
題 目 鋼筋自動折彎機的結構設計
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論 文 題 目: 鋼筋自動折彎機的結構設計
一、課題簡介
我國工程建筑機械行業(yè)近幾年之所以能得到快速發(fā)展,一方面通過引進國
外先進技術提升自身產品檔次和國內勞動力成本低廉是一個原因,另一方面
國家連續(xù)多年實施的積極的財政政策更是促使行業(yè)增長的根本動因。
受國家連續(xù)多年實施的積極財政政策的刺激,包括西部大開發(fā)、西氣東輸、
西電東送、青藏鐵路、房地產開發(fā)以及公路(道路)、城市基礎設施建設等一
大批依托工程項目的實施,這對于重大建設項目裝備行業(yè)的工程建筑機械行
業(yè)來說可謂是難得的機遇,因此整個行業(yè)的內需勢頭旺盛。同時受我國加入
WTO和國家鼓勵出口政策的激勵,工程建筑機械產品的出口形勢也明顯好轉。
我國建筑機械行業(yè)運行的基本環(huán)境、建筑機械行業(yè)運行的基本狀況、建筑
機械行業(yè)創(chuàng)新、建筑機械行業(yè)發(fā)展的政策環(huán)境、國內建筑機械公司與國外建
筑機械公司的競爭力比較以及2004年我國建筑機械行業(yè)發(fā)展的前景趨勢進行
了深入透徹的分析。
本次畢業(yè)設計為GW40型鋼筋彎曲機,適用于建筑行業(yè)彎曲Φ6—Φ40鋼筋之用。
?? 本機工作程序簡單,彎曲形狀一致,調整簡單,操作方便,性能穩(wěn)定,它能將Q235Φ40圓鋼或Φ8—Φ32螺紋鋼筋彎曲成工程中所需要的各種形狀。
二、選題背景及其意義
鋼筋彎曲機屬于一種對鋼筋彎曲機結構的改進。本實用新型包括減速機、大齒輪、小齒輪、彎曲盤面,其特征在于結構中:雙級制動電機與減速機直聯(lián)作一級減速;小齒輪與大齒輪嚙合作二級減速;大齒輪始終帶動彎曲盤面旋轉;彎曲盤面上設置有中心軸孔和若干彎曲軸孔;工作臺面的定位方杠上分別設置有若干定位軸孔。由于雙級制動電機與減速機直聯(lián)作一級減速,輸入、輸出轉數(shù)比準確,彎曲速度穩(wěn)定、準確,且可利用電氣自動控制變換速度,制動器可保證彎曲角度。利用電機的正反轉,對鋼筋進行雙向彎曲。中心軸可替換,便于維修??梢圆捎弥悄芑刂?。
當前我國正在大力發(fā)展基礎建設及城市化建設,各種建筑耗費了大量的鋼筋,其中箍筋加工的效率和質量是最難解決的問題之一,箍筋不僅使用量非常大,而且形狀和尺寸變化復雜,尺寸精度要求高,箍筋的制做在原鋼筋加工中是勞動強度大,人力物力消耗大,低效率,低質量保證的環(huán)節(jié)。隨著我國建筑行業(yè)的快速發(fā)展,為了響應政府及各建筑單位對箍筋制做自動化技術的迫切要求,我們進行技術攻關改進工藝,終于在經(jīng)過不懈的努力研制出自有專利技術的-----可調速鋼筋彎曲機GW-40B
三、實施方案
本次設計是對GW40型鋼筋彎曲機機構位置參數(shù)和動力參數(shù)的簡單計算,結合具體實例,對機構中兩種軸布置方式分析比較,最終確定主動軸和從動軸,又通過計算確定了各個齒輪的主要參數(shù),在設計的過程中,系統(tǒng)主要參數(shù)的計算最為重要,直接關系到系統(tǒng)的穩(wěn)定和性能。最后對控制設備的選擇和電機的選擇作了簡要的說明,從而完成簡GW40型可調速鋼筋彎曲機的設計。
現(xiàn)結合此鋼筋彎曲機的結構特點分述設計步驟如下:
1 、根據(jù)材料達到屈服極限時的始彎矩來確定電機的選擇:
2 、通過計算來選擇合適的V帶:
3 、相關齒輪的計算與設計:
4 、齒輪軸的設計與校核:
5 、主軸的設計:
6 、軸承的選擇:
7 、控制設備的選擇:
8 、相關電機的選擇:
四、預期成果
1、 可調速鋼筋彎曲機的總裝配圖一張以及零件圖若干(圖紙總量達2.5A0以上)
2、 設計論文一份(論文字數(shù)大于1.2萬字)
3、 開題報告一份
4、 相關英語翻譯一份
六. 論文工作量及預期進度
1) 2009/ / ~ 2009/ / : 外文資料翻譯
2) 2009/ / ~2009/ / : 搜集相關資料并調研、完成調研報告,分析可調速鋼筋彎曲機的工作原理
3) 2009/ / ~2009/ / : 完成可調速鋼筋彎曲機設計及故障分析,完成畢業(yè)設計說明書,繪制相關圖紙
4) 2009/ / ~2009/ / : 整理畢業(yè)設計說明書并定稿,準備答辯
5) 2009/ / ~2009/ / : 答辯
七、參考文獻
1. 吳宗澤主編。機械設計實用手冊。北京:化學工業(yè)出版社 2000。
2. 江耕華,陳啟松主編。機械傳動手冊。北京:煤炭工業(yè)出版社 1999。
3. 機械化科學研究院編。實用機械設計手冊。北京:中國農業(yè)機械出版社 2000。
4. 西北工業(yè)大學機械原理及機械零件教研室編。機械設計。北京:高等教育出版社 2000。
5. 陳作模主編。機械原理。北京:高等教育出版社 1998。
6. 王光銓主編。機床電力拖動與控制。北京:機械工業(yè)出版社 1999
7. 馬曉湘,鐘均祥主編。畫法幾何及機械制圖。廣州:華南理工大學出版社 2002。
8. 廖念針主編?;Q性與測量技術基礎。北京:中國計量出版社 2002。
9. 實用機械電氣技術手冊·機械工業(yè)出版社 1996
指導教師意見
導師簽名:
年 月 日
開題報告答辯評議表
評議小組意見
1、論文選題:□有理論意義;□有工程背景;□有實用價值 □意義不大。
2、論文的難度:□偏高;□適當;□偏低。
3、論文的工作量:□偏大;□適當;□偏小。
4、設計或研究方案的可行性:□好;□較好;□一般;□不可行。
5、學生對文獻資料及課題的了解程度:□好;□較好;□一般;□較差。
6、學生在論文選題報告中反映出的綜合能力和表達能力:
□好;□較好;□一般;□較差。
7、學生在論文選題報告中反映出的創(chuàng)新能力:
□好;□較好; 一般;□較差。
8、對論文選題報告的總體評價:□好;□較好;□一般;□較差
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世界最新機械設計理念
來源:中國科技期刊
摘要:根據(jù)目前國內外設計學者進行機械產品設計時的主要思維特點,將產品方案的設計方法概括為系統(tǒng)化、結構模塊化、基于產品特征知識和智能。這幾種方法的特點及其相互間的有機聯(lián)系,提出產品方案設計計算機實現(xiàn)的努力方向。
關鍵詞:機械產品方案設計方法發(fā)展趨勢
設計文件是將語義設計網(wǎng)作為設計工具,在其開發(fā)的活性語義設計網(wǎng)ASK中,采用結點和線條組成的網(wǎng)絡描述設計,結點表示元件化的單元(如設計任務、功能、構件或加工設備等),線條用以調整和定義結點間不同的語義關系,由此為設計過程中的所有活動和結果預先建立模型,使早期設計要求的定義到每一個結構的具體描述均可由關系間的定義表達,實現(xiàn)了計算機輔助設計過程由抽象到具體的飛躍。
系統(tǒng)化設計方法
系統(tǒng)化設計方法的主要特點是:將設計看成由若干個設計要素組成的一個系統(tǒng),每個設計要素具有獨立性,各個要素間存在著有機的聯(lián)系,并具有層次性,所有的設計要素結合后,即可實現(xiàn)設計系統(tǒng)所需完成的任務。
系統(tǒng)化設計思想于70年代由德國學者Pahl和Beitz教授提出,他們以系統(tǒng)理論為基礎,制訂了設計的一般模式,倡導設計工作應具備條理性。德國工程師協(xié)會在這一設計思想的基礎上,制訂出標準VDI2221技術系統(tǒng)和產品的開發(fā)設計方法。
1. 將用戶需求作為產品功能特征構思、結構設計和零件設計、工藝規(guī)劃、作業(yè)控制等的基礎,從產品開發(fā)的宏觀過程出發(fā),利用質量功能布置方法,系統(tǒng)地將用戶需求信息合理而有效地轉換為產品開發(fā)各階段的技術目標和作業(yè)控制規(guī)程的方法。
2. 將產品看作有機體層次上的生命系統(tǒng),并借助于生命系統(tǒng)理論,把產品的設計過程劃分成功能需求層次、實現(xiàn)功能要求的概念層次和產品的具體設計層次。同時采用了生命系統(tǒng)圖符抽象地表達產品的功能要求,形成產品功能系統(tǒng)結構。
3. 將機械設計中系統(tǒng)科學的應用歸納為兩個基本問題:一是把要設計的產品作為一個系統(tǒng)處理,最佳地確定其組成部分(單元)及其相互關系;二是將產品設計過程看成一個系統(tǒng),根據(jù)設計目標,正確、合理地確定設計中各個方面的工作和各個不同的設計階段。
由于每個設計者研究問題的角度以及考慮問題的側重點不同,進行方案設計時采用的具體研究方法亦存在差異。下面介紹一些具有代表性的系統(tǒng)化設計方法。
4. 設計元素法
用五個設計元素(功能、效應、效應載體、形狀元素和表面參數(shù))描述“產品解”,認為一個產品的五個設計元素值確定之后,產品的所有特征和特征值即已確定。我國亦有設計學者采用了類似方法描述產品的原理解。
5. 圖形建模法
研制的“設計分析和引導系統(tǒng)”KALEIT,用層次清楚的圖形描述出產品的功能結構及其相關的抽象信息,實現(xiàn)了系統(tǒng)結構、功能關系的圖形化建模,以及功能層之間的聯(lián)接。
將設計劃分成輔助方法和信息交換兩個方面,利用Nijssen信息分析方法可以采用圖形符號、具有內容豐富的語義模型結構、可以描述集成條件、可以劃分約束類型、可以實現(xiàn)關系間的任意結合等特點,將設計方法解與信息技術進行集成,實現(xiàn)了設計過程中不同抽象層間信息關系的圖形化建模。
6. “構思”—“設計”法
將產品的方案設計分成“構思”和“設計”兩個階段?!皹嬎肌彪A段的任務是尋求、選擇和組合滿足設計任務要求的原理解?!霸O計”階段的工作則是具體實現(xiàn)構思階段的原理解。
將方案的“構思”具體描述為:根據(jù)合適的功能結構,尋求滿足設計任務要求的原理解。即功能結構中的分功能由“結構元素”實現(xiàn),并將“結構元素”間的物理聯(lián)接定義為“功能載體”,“功能載體”和“結構元素”間的相互作用又形成了功能示意圖(機械運動簡圖)。方案的“設計”是根據(jù)功能示意圖,先定性地描述所有的“功能載體”和“結構元素”,再定量地描述所有“結構元素”和聯(lián)接件(“功能載體”)的形狀及位置,得到結構示意圖。Roper,H.利用圖論理論,借助于由他定義的“總設計單元(GE)”、“結構元素(KE)”、“功能結構元素(FKE)”、“聯(lián)接結構元素(VKE)”、“結構零件(KT)”、“結構元素零件(KET)”等概念,以及描述結構元素尺寸、位置和傳動參數(shù)間相互關系的若干種簡圖,把設計專家憑直覺設計的方法做了形式化的描述,形成了有效地應用現(xiàn)有知識的方法,并將其應用于“構思”和“設計”階段。
7. 鍵合圖法
將組成系統(tǒng)元件的功能分成產生能量、消耗能量、轉變能量形式、傳遞能量等各種類型,并借用鍵合圖表達元件的功能解,希望將基于功能的模型與鍵合圖結合,實現(xiàn)功能結構的自動生成和功能結構與鍵合圖之間的自動轉換,尋求由鍵合圖產生多個設計方案的方法。
提倡在產品功能分析的基礎上,將產品分解成具有某種功能的一個或幾個模塊化的基本結構,通過選擇和組合這些模塊化基本結構組建成不同的產品。這些基本結構可以是零件、部件,甚至是一個系統(tǒng)。
本結構應該具有標準化的接口(聯(lián)接和配合部),并且是系列化、通用化、集成化、層次化、靈便化、經(jīng)濟化,具有互換性、相容性和相關性。我國結合軟件構件技術和CAD技術,將變形設計與組合設計相結合,根據(jù)分級模塊化原理,將加工中心機床由大到小分為產品級、部件級、組件級和元件級,并利用專家知識和CAD技術將它們組合成不同品種、不同規(guī)格的功能模塊,再由這些功能模塊組合成不同的加工中心總體方案。
以設計為目錄作為選擇變異機械結構的工具,提出將設計的解元素進行完整的、結構化的編排,形成解集設計目錄。并在解集設計目錄中列出評論每一個解的附加信息,非常有利于設計工程師選擇解元素。
網(wǎng)絡技術的蓬勃發(fā)展,異地協(xié)同設計與制造,以及從用戶對產品的功能需求→設計→加工→裝配→成品這一并行工程的實現(xiàn)成為可能。但是,達到這些目標的重要前提條件之一,就是實現(xiàn)產品方案設計效果的三維可視化。為此,不僅三維圖形軟件、智能化設計軟件愈來愈多地應用于產品的方案設計中,虛擬現(xiàn)實技術以及多媒體、超媒體工具也在產品的方案設計中初露鋒芒。目前,德國等發(fā)達國家正著力于研究超媒體技術、產品數(shù)據(jù)交換標準STEP,以及標準虛擬現(xiàn)實造型語言上基于虛擬環(huán)境的標準交換格式)在產品設計中的應用。
機械產品的方案設計正朝著計算機輔助實現(xiàn)、智能化設計和滿足異地協(xié)同設計制造需求的方向邁進,由于產品方案設計計算機實現(xiàn)方法的研究起步較晚,目前還沒有成熟的、能夠達到上述目標的方案設計工具軟件。作者認為,綜合運用文中四種類型設計方法是達到這一目標有效途徑。雖然這些方法的綜合運用涉及的領域較多,不僅與機械設計的領域知識有關,而且還涉及到系統(tǒng)工程理論、人工智能理論、計算機軟硬件工程、網(wǎng)絡技術等各方面的領域知識,但仍然是產品方案設計必須努力的方向。國外在這方面的研究已初見成效,我國設計學者也已意識到CAD技術與國際交流合作的重要性,及其應當采取的措施。
基于產品特征知識設計方法的主要特點是:用計算機能夠識別的語言描述產品的特征及其設計領域專家的知識和經(jīng)驗,建立相應的知識庫及推理機,再利用已存儲的領域知識和建立的推理機制實現(xiàn)計算機輔助產品的方案設計。
機械系統(tǒng)的方案設計主要是依據(jù)產品所具有的特征,以及設計領域專家的知識和經(jīng)驗進行推量和決策,完成機構的型、數(shù)綜合。欲實現(xiàn)這一階段的計算機輔助設計,必須研究知識的自動獲取、表達、集成、協(xié)調、管理和使用。為此,國內外設計學者針對機械系統(tǒng)方案設計知識的自動化處理做了大量的研究工作,采用的方法可歸納為下述幾種。
The worlds Latest Mechanical Design Conceptssource:China Science and Technology JournalAbstract:According to scholars at home and abroad to carry out mechanicaldesign product design features of the main ideas, product design method of theprogramsummarizedassystematic,modularstructure,basedonproductcharacteristics of knowledge and wisdom. The characteristics of these methods andtheir organic connection between them and put forward to achieve the computerproduct design direction.Key words: Mechanical Product Design MethodDevelopment Trends Design documents will be Semantic Web as a design tool inthe design of its Semantic Web activity of the development of ASK, using nodes andlines to describe the design a network, nodes that components of the cell (such asdesign tasks, functions, components or processing equipment, etc. ), used to adjust thelines and definitions between nodes of different semantic relations, thus the designprocess all the activities and results of pre-built models so that the definition of theearly design requirements to the specific description of each structure can be definedby the relationship between the expression, achieved a computer-aided design process,the leap from the abstract to the concrete.Asystematic design methodThe main features of a systematic design method are: the design as designed by anumber of elements of a system, the independence of each design elements, eachelement of an organic link between the existence of, and is layered, with all the designelements , you can design systems to achieve the required task.Systematic design idea in the 70s by the German scholar Professor Pahl andBeitz, the system based on the theory they developed a general pattern of the design,advocacy design work should have organized. German Engineers Association, on thebasis of this design concept to develop a standard VDI2221 technology systems andproduct development design methods.1.The user needs functional characteristics as a product concept, structuredesign and part design, process planning, job control, etc. based on the macro fromthe product development process of starting the use of quality function deploymentmethod and system to user demand information reasonably and efficiently convertedto the various stages of product development, technical goals and operational controlprocedures method.2.The level of the product life of the organism as a system, and means ofliving systems theory, the product design process can be divided into successfulhierarchy of needs to achieve the functional requirements of the conceptual level andproduct level of the specific design. At the same time life-support systems used toexpress the abstract icons of the product functional requirements, system structureformation of product features.3.The mechanical design of the application of systems science into two basicquestions: First, to be designed as a system dealing with the products, the best way todetermine its component parts (modules) and their mutual relations1; is the productdesign process as a system, according to design objectives, a correct and reasonablydetermine the various aspects of the design work and various design stage.Because each designers point of research questions and to consider the questionof emphasis, to design a specific research methods used is also different. Here aresome representative of the systematic design methods.4.Design Element MethodWith the five design elements (functions, effects, effects vector, shape, elements,and surface parameters) describe the product solutions that a product to determinethe value of the five design elements, the product of all the features and characteristicsof the value of i.e. determined. Scholars in China have adopted similar methodsdesigned to describe the products original understanding.5.Graphic modeling methodAnd developed a design analysis and guidance systems KALEIT, with thelevel of clear graphic description of a products functional structure and its associatedabstract information, to the system structure and function relationship of graphicalmodeling, and functional connection between the layers 2.Assistance will be designed to be divided into two aspects of methodology andexchange of information using the Nijssen Information Analysis Method can be usedgraphic symbols, with a rich semantic model structure, can be described as integrationconditions, can be divided into types of constraints can be achieved in relationsbetween any combination of characteristics , the design method to solve integrationand information technology to realize the design process of information betweendifferent abstraction layers between the graphical modeling.6.Concept - Design methodProducts design is divided into concept and design in two stages. Conceptphase of the task is to find, choose and mix to meet the requirements of the originalunderstanding of design tasks. Design stage of work is a concrete realization of theoriginal understanding of the conceptual stage.Of the programs idea of specific described as: In accordance with theappropriate functional structure, seeking to meet the design requirements of theoriginal understanding of the task. The functional structure of the sub-function isperformed by the structural elements to achieve, and structural elements of thephysical connection between the definition of a feature vector, feature vector andstructural elements further the interaction between the formation of the functionaldiagram ( mechanical diagram). The program design is based on functional diagram,the first qualitative description of all of the feature vector and structural elements,and then quantitatively describe all the structural elements and the connection parts( feature vectors), the shape and location to be structure diagram3. Roper, H. usinggraph theory, by means of which he defines as the total design unit (GE), structuralelements (KE), functional structural elements (FKE), connect structural elements(VKE), Structural Parts (KT), structure element part (KET) concepts, as well asdescribe the structure element size, location, and transmission parameters of theinteractions between a number of kinds of schematics, the intuitive designprofessionals have done a formal design method a description of the formation of aneffective application of existing knowledge, methods, and applied to ideas anddesign stage.7.Bond Graph MethodFunction of the composition of system components will be divided into produceenergy, consumed energy, changing energy forms, such as various types of energytransfer, and to use bond graphs to express the function component solution, hoping tofunction-based model and bond graph combine to achieve functional structure theautomatic generation and functional structure with the bond graph automaticconversion between the search for bond graph generated by a number of designmethods.To promote the product on the basis of functional analysis, the product has somefeatures broken down into one or several modular basic structure, by selection andcombination of the basic structure of these modular form into different products.These basic structures can be parts, components, or even a system.The structure should have a standardized interface (connection and co-operationdepartment),andisserialized,universal,integrated,hierarchical,agile,economic-oriented, with interchangeability, compatibility and relevance. Chinascombination of software component technology and CAD technology, variant designcombined with the modular design, according to modular principle of classification,will be divided into descending Machining Center Machine Tool product level,component level, component level and component level, and use expert knowledgeand CAD technology to combine them into different species, different specificationsof functional blocks, and then by the combination of these functions into differentmodules of the overall program processing center.To design a directory as an alternative variation of the mechanical structure ofthe tool, the solution proposed by the design elements of a complete, structured layout,the formation of the solution set design catalogs. And in the solution set designed tocomment on each one listed in the directory solution additional information, is verybeneficial to design engineers select solution elements.The vigorous development of network technology, collaborative design andmanufacturing, as well as the product from the users functional requirements design processing assembly finished product of this realization of concurrentengineering possible. However, an important prerequisite to achieve these goals oneof the conditions is to realize the effect of product design three-dimensionalvisualization. To this end, three-dimensional graphics software, more and moreintelligent design software programs used in the product design, virtual realitytechnology and multimedia, hypermedia tools for product design is also its first debut.At present, Germany and other developed countries are focused on researchhypermedia technology, product data exchange standard STEP, as well as standardvirtual reality modeling language based on a standard exchange format for virtualenvironments) in the product design applications.Mechanical product design is moving in computer-aided realization of intelligentdesign and to meet the needs of distributed collaborative design and manufacture ofdirection, due to the computer product design Study on the implementation startedlate, not yet mature, to achieve the above objectives program design tools4. Authorbelieves that the integrated use of paper, four types of design method is an effectiveway to achieve this goal. Although the integrated use of these methods are moreinvolved in the field, not only with the mechanical design of the field-relatedknowledge, but also to the systems engineering theory, artificial intelligence theory,computer hardware and software engineering, network technology areas such asdomain knowledge, it is still product design must be working for. Abroad in researchin this area has achieved initial success, our scholars have been aware of CAD designtechnology and the importance of international exchange and cooperation, and itsmeasures to be taken.Feature-based design methodology of knowledge The main features are: using acomputer can identify the language to describe the characteristics of the product andits design experts in the field of knowledge and experience to establish the appropriateknowledge base and inference engine, re-use of stored domain knowledge and theestablishment of the inference mechanism to bring computer-aided product design.The mechanical system design is mainly based on the characteristics of a product,and design experts in the field of knowledge and experience to push volume anddecision-making, the completion of body type, the number of synthesis. To achievethis stage of computer-aided design, must study the automatic acquisition ofknowledge, expression, integration, coordination, management and use. To this end,the design and scholars at home and abroad program for the mechanical systemdesign knowledge of the automated processing done a lot of research work, theapproach can be summarized into the following several.
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