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1 英文原文 Mechanical Design Abstract A machine is a combination of mechanisms and other components which transforms transmits Examples are engines turbines vehicles hoists printing presses washing machines and movie cameras Many of the principles and methods of design that apply to machines also apply to manufactured articles that are not true machines The term mechanical design is used in a broader sense than machine design to include their design the motion and structural aspects and the provisions for retention and enclosure are considerations in mechanical design Applications occur in the field of mechanical engineering and in other engineering fields as well all of which require mechanical devices such as switches cams valves vessels and mixers Keywords Mechanical Design mechanisms Design Process The Design Process Designing starts with a need real Existing apparatus may need improvements in durability efficiency weight speed or cost New apparatus may be needed to perform a function previously done by men such as computation assembly or servicing With the objective wholly or partly In the design preliminary stage should allow to design the personnel fully to display the creativity not each kind of restraint Even if has had many impractical ideas also can in the design early time namely in front of the plan blueprint is corrected Only then only then does not send to stops up the innovation the mentality Usually must propose several sets of design proposals then perform the comparison Has the possibility very much in the plan which finally designated has used certain not in plan some ideas which accepts When the general shape and a few dimensions of the several components become apparent analysis can begin in earnest The analysis will have as its objective satisfactory or superior performance plus safety and durability with minimum weight and a competitive cost Optimum proportions and dimensions will be sought for each critically loaded section together with a balance between the strengths of the several components Materials and their treatment will be chosen These important objectives can be attained only by analysis based upon the principles of mechanics such as those of static for reaction forces and for the optimum utilization of friction of dynamics for inertia acceleration and energy of elasticity and strength of materials for stress and deflection of physical behavior of materials and of fluid mechanics for lubrication and hydrodynamic drives The analyses may be made by the same engineer who conceived the arrangement of mechanisms or in a large company they may be made by a separate analysis division or research group Design is a reiterative and cooperative process whether done formally or informally and the analyst can contribute to phases other than his own Product design requires much research and development Many Concepts of an idea must be studied tried and then either used or discarded Although the content of each engineering problem is unique the 2 designers follow the similar process to solve the problems Product liability suits designers and forced in material selection using the best program In the process of material the most common problems for five a don t understand or not use about the latest application materials to the best information b failed to foresee and consider the reasonable use material may such as possible designers should further forecast and consider due to improper use products In recent years many products liability in litigation the use of products and hurt the plaintiff accused manufacturer and won the decision c of the materials used all or some of the data data especially when the uncertainty long term performance data is so d quality control method is not suitable and unproven e by some completely incompetent persons choose materials Through to the above five questions analysis may obtain these questions is does not have the sufficient reason existence the conclusion May for avoid these questions to these questions research analyses the appearance indicating the direction Although uses the best choice of material method not to be able to avoid having the product responsibility lawsuit designs the personnel and the industry carries on the choice of material according to the suitable procedure may greatly reduce the lawsuit the quantity May see from the above discussion the choice material people should to the material nature the characteristic and the processing method have comprehensive and the basic understanding Finally a design based upon function and a prototype may be built If its tests are satisfactory the initial design will undergo certain modifications that enable it to be manufactured in quantity at a lower cost During subsequent years of manufacture and service the design is likely to undergo changes as new ideas are conceived or as further analyses based upon tests and experience indicate alterations Sales appeal Some Rules for Design In this section it is suggested that applied with a creative attitude analyses can lead to important improvements and to the conception and perfection of alternate perhaps more functional economical and durable products To stimulate creative thought the following rules are suggested for the designer and analyst The first six rules are particularly applicable for the analyst 1 A creative use of need of physical properties and control process 2 Recognize functional loads and their significance 3 Anticipate unintentional loads 4 Devise more favorable loading conditions 5 Provide for favorable stress distribution and stiffness with minimum weight 6 Use basic equations to proportion and optimize dimensions 7 Choose materials for a combination of properties 8 Select carefully stock and integral components 9 Modify a functional design to fit the manufacturing process and reduce cost 10 Provide for accurate location and noninterference of parts in assembly 3 Machinery design covers the following contents 1 Provides an introduction to the design process problem formulation safety factors 2 Reviews the material properties and static and dynamic loading analysis Including beam vibration and impact loading 3 Reviews the fundamentals of stress and defection analysis 4 Introduces fatigue failure theory with the emphasis on stress life approaches to high cycle fatigue design which is commonly used in the design of rotation machinery 5 Discusses thoroughly the phenomena of wear mechanisms surface contact stresses and surface fatigue 6 Investigates shaft design using the fatigue analysis techniques 7 Discusses fluid film and rolling element bearing theory and application 8 Gives a thorough introduction to the kinematics design and stress analysis of spur gears and a simple introduction to helical bevel and worm gearing 9 Discusses spring design including compression extension and torsion springs 10 Deals with screws and fasteners including power screw and preload fasteners 11 Introduces the design and specification of disk and drum clutches and brakes Machine Design The complete design of a machine is a complex process The machine design is a creative work Project engineer not only must have the creativity in the work but also must in aspect and so on mechanical drawing kinematics engineerig material materials mechanics and machine manufacture technology has the deep elementary knowledge One of the first steps in the design of any product is to select the material from which each part is to be made Numerous materials are available to today s designers The function of the product its appearance the cost of the material and the cost of fabrication are important in making a selection A careful evaluation of the properties of a material must be made prior to any calculations Careful calculations are necessary to ensure the validity of a design In case of any part failures it is desirable to know what was done in originally designing the defective components The checking of calculations and drawing dimensions is of utmost importance The misplacement of one decimal point can ruin an otherwise acceptable project All aspects of design work should be checked and rechecked The computer is a tool helpful to mechanical designers to lighten tedious calculations and provide extended analysis of available data Interactive systems based on computer capabilities have made possible the concepts of computer aided design CAD and computer aided manufacturing CAM How does the psychologist frequently discuss causes the machine which the people adapts them to operate Designs personnel s basic responsibility is diligently causes the machine to adapt the people This certainly is not an easy work because certainly does not have to all people to say in fact all is the most superior operating area and the operating process Another important question project engineer must be able to carry on the exchange and the consultation with other concerned personnel In the initial stage designs the personnel to have to carry on the exchange and the consultation on the preliminary design with the administrative personnel and is 4 approved This generally is through the oral discussion the schematic diagram and the writing material carries on If front sues the machine design goal is the production can meet the human need the product The invention the discovery and technical knowledge itself certainly not necessarily can bring the advantage to the humanity only has when they are applied can produce on the product the benefit Thus should realize to carries on before the design in a specific product must first determine whether the people do need this kind of product Must regard as the machine design is the machine design personnel carries on using creative ability the product design the system analysis and a formulation product manufacture technology good opportunity Grasps the project elementary knowledge to have to memorize some data and the formula is more important than The merely service data and the formula is insufficient to the completely decision which makes in a good design needs On the other hand should be earnest precisely carries on all operations For example even if places wrong a decimal point position also can cause the correct design to turn wrongly A good design personnel should dare to propose the new idea moreover is willing to undertake the certain risk when the new method is not suitable use original method Therefore designs the personnel to have to have to have the patience because spends the time and the endeavor certainly cannot guarantee brings successfully A brand new design the request screen abandons obsoletely many knows very well the method for the people Because many person of conservativeness does this certainly is not an easy matter A mechanical designer should unceasingly explore the improvement existing product the method should earnestly choose originally the process confirmation principle of design in this process with has not unified it after the confirmation new idea 5 中文譯文 機械設(shè)計 摘要 機器是由機械裝置和其它組件組成的 它是一種用來轉(zhuǎn)換或傳遞能量的裝置 例如 發(fā)動機 渦輪機 車輛 起重機 印刷機 洗衣機 照相機和攝影機等 許多原則和設(shè)計方法不但適用于機器 的設(shè)計 也適用于非機器的設(shè)計 術(shù)語中的 機械裝置設(shè)計 的含義要比 機械設(shè)計 的含義更為廣 泛一些 機械裝置設(shè)計包括機械設(shè)計 在分析運動及設(shè)計結(jié)構(gòu)時 要把產(chǎn)品外型以及以后的保養(yǎng)也要 考慮在機械設(shè)計中 在機械工程領(lǐng)域中 以及其它工程領(lǐng)域中 所有這些都需要機械設(shè)備 比如 開 關(guān) 凸輪 閥門 船舶以及攪拌機等 關(guān)鍵詞 設(shè)計流程 設(shè)計規(guī)則 機械設(shè)計 設(shè)計流程 設(shè)計開始之前就要想到機器的實際性 現(xiàn)存的機器需要在耐用性 效率 重量 速度 或者成本 上得到改善 新的機器必需具有以前機器所能執(zhí)行的功能 在設(shè)計的初始階段 應(yīng)該允許設(shè)計人員充分發(fā)揮創(chuàng)造性 不要受到任何約束 即使產(chǎn)生了許多不 切實際的想法 也會在設(shè)計的早期 即在繪制圖紙之前被改正掉 只有這樣 才不致于阻斷創(chuàng)新的思 路 通常 還要提出幾套設(shè)計方案 然后加以比較 很有可能在這個計劃最后決定中 使用了某些不在 計劃之內(nèi)的一些設(shè)想 一般的當(dāng)外型特點和組件部分的尺寸特點分析得透徹時 就可以全面的設(shè)計和分析 接著還要客 觀的分析機器性能的優(yōu)越性 以及它的安全 重量 耐用性 并且競爭力的成本也要考慮在分析結(jié)果 之內(nèi) 每一個至關(guān)重要的部分要優(yōu)化它的比例和尺寸 同時也要保持與其它組成部分相協(xié)調(diào) 也要選擇原材料和處理原材料的方法 通過力學(xué)原理來分析和實現(xiàn)這些重要的特性 如那些靜態(tài) 反應(yīng)的能量和摩擦力的最佳利用 像動力慣性 加速動力和能量 包括彈性材料的強度 應(yīng)力和剛度 等材料的物理特性 以及流體潤滑和驅(qū)動器的流體力學(xué) 設(shè)計的過程是重復(fù)和合作的過程 無論是正 式或非正式的進行 對設(shè)計者來說每個階段都很重要 最后 以圖樣為設(shè)計的標(biāo)準(zhǔn) 并建立將來的模型 如果它的測試是符合事先要求的 則再將對初 步設(shè)計進行某些修改 使它能夠在制造成本上有所降低 產(chǎn)品的設(shè)計需要不斷探索和發(fā)展 許多方案 必須被研究 試驗 完善 然后決定使用還是放棄 雖然每個工程學(xué)問題的內(nèi)容是獨特的 但是設(shè)計 師可以按照類似的步驟來解決問題 產(chǎn)品的責(zé)任訴訟迫使設(shè)計人員和公司在選擇材料時 采用最好的程序 在材料過程中 五個最常 見的問題為 a 不了解或者不會使用關(guān)于材料應(yīng)用方面的最新最好的信息資料 b 未能預(yù)見和考 慮材料的合理用途 如有可能 設(shè)計人員還應(yīng)進一步預(yù)測和考慮由于產(chǎn)品使用方法不當(dāng)造成的后果 在近年來的許多產(chǎn)品責(zé)任訴訟案件中 由于錯誤地使用產(chǎn)品而受到傷害的原告控告生產(chǎn)廠家 并且贏 得判決 c 所使用的材料的數(shù)據(jù)不全或是有些數(shù)據(jù)不確定 尤其是當(dāng)其性能數(shù)據(jù)長期不更新 d 質(zhì) 6 量控制方法不適當(dāng)和未經(jīng)驗證 e 由一些完全不稱職的人員選擇材料 通過對上述五個問題的分析 可以得出這些問題是沒有充分理由而存在的結(jié)論 對這些問題的研 究分析可以為避免這些問題的出現(xiàn)而指明方向 盡管采用最好的材料選擇方法也不能避免發(fā)生產(chǎn)品責(zé) 任訴訟 設(shè)計人員和工業(yè)界按照適當(dāng)?shù)某绦蜻M行材料選擇 可以大大減少訴訟的數(shù)量 從以上的討論可以看出 選擇材料的人們應(yīng)該對材料的性質(zhì) 特點和加工方法有一個全面而基本 的了解 在隨后生產(chǎn)和售后服務(wù)的幾年中 要接受新觀念的變化 或者由試驗和經(jīng)驗為基礎(chǔ) 進一步分析 并改進 一些設(shè)計規(guī)則 在本節(jié)中 建議要運用創(chuàng)造性的態(tài)度來替代和改進 也許會創(chuàng)造出更實用 更經(jīng)濟 更耐用的產(chǎn) 品 為了激發(fā)創(chuàng)造性思維 下列是設(shè)計和分析的建議規(guī)則 前六個規(guī)則對設(shè)計者來說特別適用 1 要有創(chuàng)造性的利用所需要的物理性質(zhì)和控制過程 2 認(rèn)識負(fù)載產(chǎn)生的影響及其意義 3 預(yù)測沒有想到的負(fù)載 4 創(chuàng)造出對載荷更為有利的條件 5 提供良好的應(yīng)力分布和最小的剛度條件 6 運用最簡單的方程來優(yōu)化體積和面積 7 選擇組合材料 8 仔細(xì)選擇所備的原料和不可缺少的組件 9 調(diào)整有效的設(shè)計方案 以適應(yīng)生產(chǎn)過程和降低成本 10 規(guī)定好準(zhǔn)確的位置條件為了使組件安裝時不干涉 機械設(shè)計包括一下內(nèi)容 1 對設(shè)計過程 設(shè)計所需要公式以及安全系數(shù)進行介紹 2 回顧材料特性 靜態(tài)和動態(tài)載荷分析 包括梁 振動和沖擊載荷 3 回顧應(yīng)力的基本規(guī)律和失效分析 4 介紹靜態(tài)失效理論和靜態(tài)載荷下機械斷裂分析 5 介紹疲勞失效理論并強調(diào)在壓力條件下接近高循環(huán)的疲勞設(shè)計 這通常用在旋轉(zhuǎn)機械的 設(shè)計中 6 深入探討機械磨損機理 表面接觸應(yīng)力和表面疲勞現(xiàn)象 7 使用疲勞分析技術(shù)校核軸的設(shè)計 8 討論潤滑油膜與滾動軸承的理論和應(yīng)用 9 深入介紹直齒圓柱齒輪的動力學(xué) 設(shè)計和應(yīng)力分析 并簡單介紹斜齒輪 錐齒輪和渦輪 有關(guān)方面的問題 10 討論彈簧設(shè)計 螺桿等緊固件的設(shè)計 包括傳動螺桿和預(yù)緊固件 11 介紹盤式和鼓式離合器以及制動器的設(shè)計和技術(shù)說明 7 機械設(shè)計 一臺完整機器的設(shè)計是一個復(fù)雜的過程 機械設(shè)計是一項創(chuàng)造性的工作 設(shè)計工程師不僅在工作 上要有創(chuàng)造性 還必須在機械制圖 運動學(xué) 工程材料 材料力學(xué)和機械制造工藝學(xué)等方面具有深厚 的基礎(chǔ)知識 任何產(chǎn)品在設(shè)計時第一步就是選擇產(chǎn)品每個部分的構(gòu)成材料 許多的材料被今天的設(shè)計師所使用 對產(chǎn)品的功能 它的外觀 材料的成本 制造的成本作出必要的選擇是十分重要的 對材料的特性必 須事先作出仔細(xì)的評估 仔細(xì)精確的計算是必要的 以確保設(shè)計的有效性 在任何失敗的情況下 最好知道在最初設(shè)計中 有有缺陷的部件 計算 圖紙尺寸 檢查是非常重要的 一個小數(shù)點的位置放錯 就可以導(dǎo)致一個本 可以完成的項目失敗 設(shè)計工作的各個方面都應(yīng)該檢查和復(fù)查 計算機是一種工具 它能夠幫助機械設(shè)計師減輕繁瑣的計算 并對現(xiàn)有數(shù)據(jù)提供進一步的分析 互動系統(tǒng)基于計算機的能力 已經(jīng)使計算機輔助設(shè)計 CAD 和計算機輔助制造 CAM 成為了可能 心理學(xué)家經(jīng)常談?wù)撊绾问谷藗冞m應(yīng)他們所操作的機器 設(shè)計人員的基本職責(zé)是努力使機器來適應(yīng)人們 這并不是一項容易的工作 因為實際上并不存在著一個對所有人來說都是最優(yōu)的操作范圍和操作過程 另一個重要問題 設(shè)計工程師必須能夠同其他有關(guān)人員進行交流和磋商 在開始階段 設(shè)計人員必須 就初步設(shè)計同管理人員進行交流和磋商 并得到批準(zhǔn) 這一般是通過口頭討論 草圖和文字材料進行 的 如前所訴 機械設(shè)計的目的是生產(chǎn)能夠滿足人類需求的產(chǎn)品 發(fā)明 發(fā)現(xiàn)和科技知識本身并不一 定能給人類帶來好處 只有當(dāng)它們被應(yīng)用在產(chǎn)品上才能產(chǎn)生效益 因而 應(yīng)該認(rèn)識到在一個特定的產(chǎn) 品進行設(shè)計之前 必須先確定人們是否需要這種產(chǎn)品 應(yīng)當(dāng)把機械設(shè)計看成是機械設(shè)計人員運用創(chuàng)造性的才能進行產(chǎn)品設(shè)計 系統(tǒng)分析和制定產(chǎn)品的制 造工藝學(xué)的一個良機 掌握工程基礎(chǔ)知識要比熟記一些數(shù)據(jù)和公式更為重要 僅僅使用數(shù)據(jù)和公式是 不足以在一個好的設(shè)計中做出所需的全部決定的 另一方面 應(yīng)該認(rèn)真精確的進行所有運算 例如 即使將一個小數(shù)點的位置放錯 也會使正確的設(shè)計變成錯誤的 一個好的設(shè)計人員應(yīng)該勇于提出新的想法 而且愿意承擔(dān)一定的風(fēng)險 當(dāng)新的方法不適用時 就 使用原來的方法 因此 設(shè)計人員必須要有耐心 因為 所花費的時間和努力并不能保證帶來成功 一 個全新的設(shè)計 要求屏棄許多陳舊的 為人們所熟知的方法 由于許多人墨守成規(guī) 這樣做并不是一 件容易的事 一位機械設(shè)計師應(yīng)該不斷地探索改進現(xiàn)有的產(chǎn)品的方法 在此過程中應(yīng)該認(rèn)真選擇原有 的 經(jīng)過驗證的設(shè)計原理 將其與未經(jīng)過驗證的新觀念結(jié)合起來 新設(shè)計本身會有許多缺陷和未能預(yù)料的問題發(fā)生 只有當(dāng)這些缺陷和問題被解決之后 才能體現(xiàn) 出新產(chǎn)品的優(yōu)越性 因此 一個性能優(yōu)越的產(chǎn)品誕生的同時 也伴隨著較高的風(fēng)險 應(yīng)該強調(diào)的是 如果設(shè)計本身不要求采用全新的方法 就沒有必要僅僅為了變革的目的而采用新方法 無錫太湖學(xué)院 畢 業(yè) 設(shè) 計 論 文 開 題 報 告 題目 全自動液壓專用機床改造 信 機 系 機 械 制 造 及 其 自 動 化 專 業(yè) 學(xué) 號 0923009 學(xué)生姓名 高宏新 指導(dǎo)教師 屠德剛 職稱 高級工程 師 職稱 2012 年 11 月 21 日 課題來源 無錫市無錫宏源機械廠 科學(xué)依據(jù) 包括課題的科學(xué)意義 國內(nèi)外研究概況 水平和發(fā)展趨勢 應(yīng) 用前景等 改造后的機床為全自動液壓專用機床 專用機床是加工某種特定零件 完成某些 特定工序的專門性機床 本設(shè)計將 6136 普通車床改造成全自動液壓專用機床 這樣 在生產(chǎn)錠腳時 可以大大的提高生產(chǎn)率 降低勞動強度 目前 國外在高科技數(shù)控機床方面已經(jīng)高度發(fā)達 而我國的工廠企業(yè) 除了一些 新建的單位外 大多數(shù)都存在設(shè)備的老化問題 而且 我國的大部分高性能機床都是 出自國外先進制造商 無論是在數(shù)量上 性能指標(biāo)上 中國制造業(yè)都遠遠落后于發(fā)達 國家 需要我們奮起直追 本設(shè)計是基于舊設(shè)備上進行改造 從而可使工作量大大的 減少 節(jié)省很多物資 制造成本低 且見效快 普通機床數(shù)控化改造的市場在我國還 有很大的發(fā)展空間 改造機床還有一個顯著的特點是興廢利舊 使原先已淘汰的機床 重見陽光 充分發(fā)揮其使用價值 研究內(nèi)容 全自動液壓專用機床改造 一 零件的工藝性分析 二 總體方案的確定 1 采用單刀靠模 2 采用雙刀靠模 三 刀架拖板設(shè)計 1 對設(shè)計本部分的重要性進行分析 2 分別對 縱向液壓缸的安置和橫向液壓缸的安置的設(shè)計方案進行選擇 3 排屑方案的選擇 四 機構(gòu)設(shè)計和計算分析 1 縱向液壓缸的設(shè)計 2 橫向液壓缸的設(shè)計 3 彈簧的設(shè)計與計算 4 螺桿的校核 擬采取的研究方法 技術(shù)路線 實驗方案及可行性分析 分析國內(nèi)外普通機床市場各種改造后的全自動液壓機床的特點以及性能穩(wěn)定性 全自動液壓專用機床改造過程中的問題 各部件機構(gòu)及工作原理 機械設(shè)計過程 通 過對液壓機床各部件的性能分析 最終改造出一臺適合高效率生產(chǎn)該錠腳的全自動液 壓專用機床 運用 CAD 和 UG 軟件進行設(shè)計 分析全自動液壓專用機床總成及各部件的位置結(jié) 構(gòu)和功能 建立三維數(shù)模 對總成進行運動仿真 分析運動數(shù)據(jù) 優(yōu)化結(jié)構(gòu)布置 江蘇省無錫市宏源機械廠在普通機床改造領(lǐng)域 運用相當(dāng)先進的計算機輔助設(shè)計 CAD 和計算機輔助制造 CAM 軟件等進行改造設(shè)計 至今已積累了數(shù)十臺普通機床改 造后的數(shù)控機床 同時也積累了很多零部件開發(fā)及數(shù)控機床改造經(jīng)驗 在普通機床方 面具備很強的設(shè)計開發(fā)改造能力 同時國內(nèi)外市場對液壓專用機床的需求不斷擴大 對全自動液壓專用機床的自動化程度要求越來越高 具備很大的市場可行性 研究計劃及預(yù)期成果 研究計劃 實習(xí)調(diào)研 開題準(zhǔn)備 生產(chǎn)操作規(guī)程編制 計算分析 結(jié)構(gòu)設(shè) 計 編寫設(shè)計說明書 預(yù)期成果 1 完成液壓專用機設(shè)計 2 繪制零件圖 10 張 3 繪制裝配圖 2 張 4 編寫設(shè)計說明書 1 份 特色或創(chuàng)新之處 全自動液壓專用機床的整個機構(gòu) 功能 性能都可通過 UG 設(shè)計得以實現(xiàn) 實現(xiàn) 了產(chǎn)品的快速改造設(shè)計 通過運動仿真可以校核是否存在結(jié)構(gòu)干涉情況 降低了樣品 試制的成本和風(fēng)險 全自動液壓專用機床的改造結(jié)構(gòu)簡單 制造成本低 性能穩(wěn)定可靠 采用液壓驅(qū) 動 可實現(xiàn)產(chǎn)品生產(chǎn)自動化 使操作人員操作方便靈活 從而大大提高了工作效率 已具備的條件和尚需解決的問題 已具備的條件 電腦 相關(guān)改造設(shè)計軟件 部分技術(shù)資料 尚需解決的問題 學(xué)習(xí) CAD 軟件及 PPT 制作軟件 確定產(chǎn)品的結(jié)構(gòu)尺寸和技術(shù)要 求 指導(dǎo)教師意見 指導(dǎo)教師簽名 年 月 日 教研室 學(xué)科組 研究所 意見 教研室主任簽名 年 月 日 系意見 主管領(lǐng)導(dǎo)簽名 年 月 日