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附錄1
Manufacturing Engineering in the Information and
The Roles of Engineers in Manufacturing
In the early 1980s, engineers thought that massive research would be needed to speed up product development. As it turns out, less research is actually needed because shortened product development cycles encourage engineers to use available technology. Developing a revolutionary technology for use in a new product is risky and prone to failure. Taking short steps is a safer and usually more successful approach to product development.
Shorter product development cycles are also beneficial in an engineering world in which both capital and labor are global. People who can design and manufacture various products can be found anywhere in the world, but containing a new idea is hard. Geographic distance is no longer a barrier to others finding out about your development six months into the process. If you have got a short development cycles, the situation is not catastrophic, as long as you maintain you lead. But if you are in the midst of a six year development process and a competitor gets wind of you work, the project could be in more serious trouble.
The idea that engineers need to create a new design to solve every problem is quickly becoming obsolete. The first step in the modern design process is to browse the Internet or other information systems to see if someone else has already designed a transmission, or a heat exchanger that is close to what you need. Through these information systems, you may discover that someone already has manufacturing drawings, numerical control tapes, and everything else required to manufacture your product. Engineers can then focus their professional competence on unsolved problems.
In tackling such problems, the availability of workstations and access to the information highway dramatically enhance the capability of the engineering team and its productivity. These information age tools can give the team access to massive databases of material properties, standards, technologies, and successful designs. Such protested designs can be downloaded for direct use or quickly modified to meet specific needs. Remote manufacturing, in which product instructions are sent out over a network, is also possible. You could end up with a virtual company where you do not have to see any hardware. When the product is completed, you can direct the manufacturer to the drop-ship it to your customer. Periodic visits to the customer can be made to ensure that the product you designed is working according to the specifications. Although all of these developments won’t apply equally to every company, the potential is there.
Custom design used to be left to mall companies. Big companies sneered at it－they hated the idea of dealing with niche markets or small-volume custom solutions. “Here is my product,” one of the big companies would say. “This is the best we can make it －you ought to like it. If you don’t, these is smaller company down the street that will work on your problem. ”
Today, nearly every market is a niche market, because customers are selective. If you ignore the potential for tailoring your product to specific customers’ needs, you will lose the major part of your market share－perhaps all of it. Since the niche markets are transient, your company needs to be in a position to respond to them quickly.
The emergence of niche markets and design on demand has altered the way engineers conduct research. Today, research is commonly directed toward solving particular problem. Although this situation is probably temporary, much uncommitted technology, developed at government expense or written off by major corporation, is available today at very low cost. Following modest modifications, such technology can often be used directly in product development, which allows many organizations to avoid the expense of an extensive research effort. Once the technology is free of major obstacles, the research effort can focus on overcoming the barriers to avoid the barriers to commercialization rather than on pursuing new and interesting, but undefined, alternatives.
When viewed in this perspective, engineering research must focus primarily on removing the barriers to rapid commercialization of known technologies. Much of this effort must address quality and reliability concerns, which are foremost in the minds of today’s consumers. Clearly, a reputation for poor quality is synonymous with bad business. Everything possible－including thorough inspection at the end of the manufacturing line and automatic replacement of defective products－must be done to assure that the customer receives a properly functioning product.
Central to the process of improving reliability and lowering costs is the intensive and widespread use of design software, which allows engineers to speed up every stage of the design process. Shortening each stage, however, may not sufficiently reduce the time required for the entire process. Therefore, attention must also be devoted to concurrent engineering software with shared databases that can be accessed by all members of the design team.
Many engineers have as their function the designing of products that are to be brought into reality through the processing or fabrication of materials. In this capacity they are a key factor in the material selection-manufacturing procedure. A design engineer, better than any other person, should know what he or she wants a design to accomplish. He knows what assumptions he has made about service loads and requirements, what service environment the product must withstand, and what appearance he wants the final product to have. In order to meet these requirements he must select and specify the material(s) to be used. In most cases, in order to utilize the material and to enable the product to have the desired form, he knows that certain manufacturing processes will have to be employed. In many instances, the selection of a specific material may dictate what processing must be used. At the same time, when certain processes are to be used, the design may have to be modified in order for the process to be utilized effectively and economically. Certain dimensional tolerances can dictate the processing. In any case, in the sequence of converting the design into reality, such decisions must be made by someone. In most instances they can be made most effectively at the design stage, by the designer if he has a reasonably adequate knowledge concerning materials and manufacturing processes. Otherwise, decisions may be made that will detract from the effectiveness of the product, or the product may be needlessly costly. It is thus apparent that design engineers are a vital factor in the manufacturing process, and it is indeed a blessing to the company if they can design for producibility－that is, for efficient production.
Manufacturing engineers select and coordinate specific processes and equipment to be used, or supervise and manage their use. Some design special tooling that is used so that standard machines can be utilized in producing specific products. These engineers must have a broad knowledge of machine and process capabilities and of materials, so that desired operations can be done effectively and efficiently without overloading or damaging machines and without adversely affecting the materials being processed. These manufacturing engineers also play an important role in manufacturing.
A relatively small group of engineers design the machines and equipment used in manufacturing. They obviously are design engineers and, relative to their products, they have the same concerns of the interrelationship of design, materials, and manufacturing processes. However, they have an even greater concern regarding the properties of the materials that their machines are going to process and the inter reaction of the materials and the machines.
Still another group of engineers－the materials engineers－devote their major efforts toward developing new and better materials. They, too, must be concerned with how these materials can be processed and with the effects the processing will have on the properties of the materials.
Although their roles may be quite different, it is apparent that a large proportion of engineers must concern themselves with the interrelationship between materials and manufacturing processes.
Low-cost manufacture does not just happen. There is a close and interdependent relationship between the design of a product, selection of materials, selection of processes and equipment, and tooling selection and design. Each of these steps must be carefully considered, planned, and coordinated before manufacturing starts. This lead time, particularly for complicated products, may take months, even years, and the expenditure of large amount of money may be involved. Typically, the lead time for a completely new model of an automobile is about 2 years, for a modern aircraft it may be 4 years.
With the advent of computers are machines that can be controlled by either tapes made by computers or by the computers themselves, we are entering a new era of production planning. The integration of the design function and the manufacturing function the computer is called CAD/CAM (computer aided design/computer aided manufacturing). The design is used to determine the manufacturing process planning and the programming information for the manufacturing process themselves. Detailed drawings can also be made from the central data base used for the design and manufacture, and programs can be generated to make the parts as needed. In addition, extensive computer aided testing and inspection (CATI) of the manufactured parts is taking place. There is no doubt that this trend will continue at ever-accelerating rates as computers become cheaper and smaller.
As we move more fully into the Information Age success will require that the engineer possess some unique knowledge of and experience in both the development and the management of technology. Success will require broad knowledge and skills as well as expertise in some key technologies and disciplines；it also require a keen awareness of the social and economic factors at work in the marketplace. Increasingly, in the future, routine problems will not justify heavy engineering expenditures, and engineers will be expected to work cooperatively in solving more challenging, more demanding problems in substantially less time. We have begun a new phase in the practice of engineer. It offers great promise and excitement as more and more problem-solving capability is placed in the hands of the computerized and wired engineer. To assure success, the capability of our tools and the unquenched thirst for better products and systems must be matched by the joy of creation that marks all great engineering endeavors. Mechanical engineering is a great profession, and it will become even greater as we make the most of the opportunities offered by the Information Age.
附錄2
信息時代的機械工程及工程師在機械行業(yè)的應用
在80年代初期,工程師們曾經認為要加快產品的研制開發(fā),必須進行大量的研發(fā)工作。結果是實際上只進行了較少的研究工作,這是因為產品開發(fā)周期的縮短,促使工程師們盡可能的利用現有的技術。研制開發(fā)一種創(chuàng)新性的技術并將其應用在新產品上,是有風險的,并且易于招致失敗。在產品開發(fā)過程中采用較少的步驟是一種安全的和易于成功的方法。
對于資金和人力都處于全球性環(huán)境中的工程界而言,縮短產品研制開發(fā)周期也是有益的。能夠設計和制造各種產品的人可以在世界各地找到.但是,具有創(chuàng)新思想的人則比較難找。對于你已經進行了6個月的研制開發(fā)工作,地理上的距離已經不是其他人發(fā)現它的障礙。如果你的研制周期較短,只要你仍然保持領先,這種情況并怒會造成嚴重后果。但是如果你正處于一個長達6年的研制開發(fā)過程的中期,一個競爭對手了解你的研究工作的一些信息,這個項目將面臨比較大的麻煩。
工程師們在解決任何問題時都需要進行新的設計，這種觀念很快就過時了。在現代設計中的第一步是瀏覽因特網或者其他信息系統(tǒng),看其他人是否設計了一種類似于你所需要的產品,諸如傳動裝置或者換熱氣等。通過這些信息系統(tǒng),你可能發(fā)現有些人已經有了制造圖紙,數控紙帶和制造你的產品所需要的其他所有東西。這樣,工程師們就可以把他們的職業(yè)技能集中在上尉解決的問題上。
在解決這類問題時,利用工作站和進入信息高速公路可以大大增強工程小組的能力和效率。這些信息時代的工具可以使工作小組利用大規(guī)模的數據庫.數據庫中有材料性能,標準,技術和成功的設計方案等信息。這些經過驗證的設計可以通過下載直接應用,或者通過對其進行快速,簡單的改進來滿足特定的要求。將產品的技術要求通過網絡送出去的遠程制造也是可行的。你可以建立一個沒有任何加工設備的虛擬公司。你可以指示制造商,在產品加工完成后,將其直接送給你的客戶。定期訪問你的客戶可以保證你設計的產品按照設計要求進行工作.盡管這些研發(fā)方式不可能對每個公司都完全適用,但這種可能性是存在的。
過去客戶設計的產品通常是由小公司來制造。大公司不屑于制造這種產品，他們討厭與特殊定向產品市場,或者是客戶設計的小批量產品打交道。 “這就是我們的產品”,一家大公司這樣說:“這是我們能夠制造出來的最好產品,你應該喜歡它.如果你不喜歡,順這條街走有一家小公司,它會按你的要求去做?！?
今天,因為顧客們有較大的選擇余地,幾乎所有的市場都是特殊定向產品市場。如果你不能使你的產品滿足某些特定客戶的要求,你將失掉你的市場份額中的一大部分,或者失掉全部份額.由于這些定向產品市場是經常變化的,你的公司應該對市場的變化作出快速的反應。
定向產品市場和根據客戶要求進行設計這種現象的出現改變了工程師研究工作的方式。今天,研究工作通常是針對解決特定問題進行的.現在許多由政府資助或者由大公司出資開發(fā)的技術可以在非常低的成本下被自由使用,盡
管這種情況可能是暫時的.在對這些技術進行適當改進后,他們通常能夠被直接用于產品開發(fā),這使得許多公司可以節(jié)省昂貴的研究經費.在主要的技術障礙被克服后,研究工作應該主要致力于產品的商品化方面,而不是開發(fā)新的,有趣的,不確定的替換產品。
采用上述觀點看問題,工程研究應該致力于消除將已知技術快速商品化的障礙.工作的重點是產品的質量和可靠性,這些在當今的顧客的頭腦中是很重要的。很明顯一個質量差的聲譽是一個不好的企業(yè)的同義詞。企業(yè)應該進最大的努力來保證顧客得到合格的產品，這個努力包括在生產線的終端對產品進行嚴格的檢驗和自動更換有缺陷的產品。
研究工作應該著重考慮諸如可靠性等因素對成本帶來的益處。當可靠性提高時，制造成本和系統(tǒng)的最低成本將會降低。如果在生產線的終端產生了30﹪的廢品，這不僅會浪費金錢，也會給你的競爭對手創(chuàng)造一個利用你的想法制造產品，并將其銷售給你的客戶的良機。
提高可靠性和降低成本這個過程的關鍵是深入，廣泛的地利用設計軟件。設計軟件可以使工程師加快每一階段的設計工作。然而，僅僅縮短每一階段的設計時間，可能不會顯著地縮短整個設計過程的時間。因而，必須致力于采用并行工程軟件，這樣可以使所有設計組的成員都能使用共同的數據庫。
許多工程師的職責是進行產品設計，而產品是通過對材料的加工制造而生產出來的。設計工程師在材料選擇，制造方法等方面起著關鍵的作用。一個設計工程師應該比其他的人更清楚地知道他的設計需要達到什么目的。他知道他對使用荷載和使用要求所做的假設，產品的使用環(huán)境，產品應該具有的外觀形貌。為了滿足這些要求，他必須選擇和規(guī)定所使用的材料。通常，為了利用材料并使產品具有所期望的形狀，設計工程師知道應該采用哪寫制造方法。在許多情況下，選擇了某種特定材料就可能意味著已經確定了某種必須采用的加工方法。總之，在將設計轉變?yōu)楫a品的過程中，必須有人作出這些決定。在大多數情況下，如果設計人員在材料加工方面具有足夠的知識，他會在設計階段作出最為合理的決定。否則，作出的決定可能會降低產品的性能，或者使產品變得過于昂貴。顯然，設計工程師是制造過程中的關鍵任務，如果他們能夠進行面向生產（即可以進行高效率生產）的設計，就會給公司帶來效益。
制造工程師們選擇和調整所采用的加工方法和設備，或者監(jiān)督和管理這些加工方法和設備的使用。一些工程師進行專用裝備的設計，以使通用機床能夠被用來生產特定的產品。這些工程師們在機床，工藝能力和材料方面必須句用廣泛的知識，以使機器在沒有過載和損壞，而且對被加工材料沒有不良影響的情況下，更為有效地完成所需要的加工工序。這些制造工程師們在制造業(yè)中也起到重要作用。
少數工程師們設計在制造業(yè)中使用的機床和設備。顯然，他們上設計工程師。而且對于他們的產品而言，他們同樣關心設計，材料，和制造方法之間的相互關系。然而，他們更多地關心他們所設計的機床將要加工的材料的性能和機床與材料之間的相互作用。
還有另外一些工程師，即材料工程師，他們致力于研制新型的和更好的材料，他們也應該關心這些材料的加工方法和加工對材料性能的影響。
盡管工程師們所起的作用可能會有很大差別，但是，大部分工程師們都必須考慮材料與制造工藝之間的相互關系。
低成本制造并不是自動產生的。在產品設計，材料選擇，加工工藝裝備選擇和設計之間都有著非常密切的相互依賴關系。這些步驟中的每一個都必須在開始制造前仔細的加以考慮，規(guī)劃和協(xié)調。這種從產品設計到實際生產的準備工作，特別是對于復雜產品，可能需要數月甚至數年的時間，并且可能花費很多錢。典型的例子有，對于一種全新的汽車，從設計到投產所需要的時間大約為2年，而一種現代化飛機則可能需要4年。
隨著計算機和由計算機產生的紙帶與計算機本身控制機器的出現，我們進入了一個生產計劃的新時代。采用計算機將產品的設計功能與制造集成，被稱為CAD/CAM（計算機輔助設計/計算機輔助制造）。這種設計被用來制定加工工藝規(guī)程和提供加工過程本身的編程信息?？梢愿鶕峁┰O計與制造用的中心數據庫內的信息繪制零件圖，需要時可以生成加工這些零件時使用的程序。此外，對加工后零件的計算機輔助試驗與檢驗也得到了廣泛的應用。隨著計算機價格的降低和性能的提高，這種趨勢將毫無疑問地得到不斷加速的發(fā)展。
隨著我們步入信息時代，要取得成功，工程師們在技術開發(fā)和技術管理方面都應該具有一些獨特的知識和經驗。成功的工程師們不但應該具有寬廣的知識和技能，而且還應該是某些關鍵技術或學科的專家，他們還應該在社會因素和經濟因素對市場的影響方面有敏銳的洞察能力。將來，花在解決日常工程問題上的費用將會減少，工程師們將會在一些更富挑戰(zhàn)性，更亟待解決的問題上協(xié)同工作，大大縮短解決這些問題所需的時間。我們已經開始了工程實踐的新階段。計算機和網絡使工程師們具有了越來越強的解決問題的能力，這也給他們的工作帶來了很大的希望和喜悅。為了確保成功，我們所使用的工具的性能和對更好的產品與系統(tǒng)的不斷追求應該與標志著在工程方面所有巨大努力的創(chuàng)新工作所帶來的喜悅相適應。機械工程是一個偉大的行業(yè)，在我們盡可能多地利用了信息時代所提供的機遇后，它將變得更加偉大。
12 屆畢業(yè)設計 風選式核桃殼仁分離機 設計說明書 學生姓名 學 號 所屬學院 機械電氣化工程學院 專 業(yè) 機械設計制造及其自動化 班 級 指導教師 日 期 塔里木大學教務處制 目 錄 1 緒論 .............................................................................................................................1 1.1 選題的意義和目的 ..............................................................................................................1 1.2 國內外研究現狀 ..................................................................................................................1 2 破殼后的核桃物料特性研究 .....................................................................................4 2.1 破殼后核桃物料形態(tài)參數的分析與測定 ..........................................................................4 2.2 破殼后核桃物料各種成份含量的測定 ..............................................................................6 2.3 破殼后的核桃物料空氣動力學特性的研究 ......................................................................6 3 核桃殼仁分離機的整體結構和工作原理 ..........................................................................8 4 風選式核桃殼仁分離機的設計 .............................................................................................9 4.1 喂料斗的設計 ......................................................................................................................9 4.2 機架的設計 ..........................................................................................................................9 4.3 電動機的選擇 ....................................................................................................................10 5 帶及帶輪的設計 ......................................................................................................................11 5.1 傳動帶的設計 ....................................................................................................................11 6 V 帶帶輪的設計 .....................................................................................................................14 6.1 帶輪的材料選擇 ................................................................................................................14 6.2 結構設計 ............................................................................................................................14 6.3 從動帶輪的設計 ...............................................................................................................15 7 傳動軸的設計 ..........................................................................................................................15 7.1 根據軸向定位的要求確定軸的各段直徑和長度 ............................................................16 7.2 按彎扭合成條件校核軸的強度 .......................................................................................16 7.3 校核軸的強度 ...................................................................................................................20 8 運用連桿曲線圖譜設計四桿機構 ......................................................................................21 9 風機的選擇 ...............................................................................................................................22 10 主要成果及結論 ....................................................................................................................22 11 存在的問題和進一步研究建議 ........................................................................................23 致 謝 ..............................................................................................................................................24 參考文獻 .......................................................................................................................................25 前 言 隨著核桃種植面積和產量的不斷增加，核桃深加工日益被重視，同時市場對核桃深加 工產品的需求量也越來越大。將核桃仁進行深加工不僅可以提高經濟效益，還能夠帶動核 桃產業(yè)的發(fā)展。對破殼后的核桃殼仁進行分離是核桃進行深加工前的一個重要處理工序， 必須得到解決。 通過對本地主產的核桃進行試驗，本文對破殼后核桃物料中各種成分的含量、以 及空氣動力學特性進行了測定和分析，找出了影響破殼后核桃物料分離的主要因素，決定 對破殼后的核桃物料從橫向上通過風力進行分離。通過對振動裝置主要的振動特性參數和 破殼后的核桃物料在振動裝置上的受力進行分析和研究，設計出合適的振動裝置。設計出 一種風選式核桃殼仁分離機，該分離機輸送裝置將喂料箱中的核桃物料均勻連續(xù)地送到振 動裝置上，振動裝置由曲柄連桿電機驅動。在振動篩作用下，核桃仁和半截核桃在振動裝 置上產生跳動和滑動在重力以及風機提供的氣流場的共同作用下，進入接料箱中。