巧克力顆粒糖果包裝機結構設計【含8張CAD圖帶開題報告+外文翻譯-獨家】.zip
巧克力顆粒糖果包裝機結構設計【含8張CAD圖帶開題報告+外文翻譯-獨家】.zip,含8張CAD圖帶開題報告+外文翻譯-獨家,巧克力,顆粒,糖果,裝機,結構設計,CAD,開題,報告,外文,翻譯,獨家
目 錄
1 英文文獻翻譯 1
1.1英文文獻原文 2
1.2中文翻譯3
2 專業(yè)閱讀書目 4
2.1 機械設計 5
2.2 機械原理6
2.3 機電一體化系統(tǒng)設計 5
2.4 Creo2.0機械設計教程6
2.5 單片機原理及接口技術 5
2.6 機械設計課程設計6
2.7 現(xiàn)代工程制圖 5
2.8 機械零部件選用與設計6
2.9 材料力學 5
2.10 理論力學6
1 英文文獻翻譯
1.1 Modern Packaging
Author:
Abstract
1. Changing Needs and New Roles
Looking back, historical changes are understandable and obvious. That all of them have had an impact on the way products are brought, consumed and packaged is also obvious. What is not so obvious is what tomorrow will bring. Yet, it is to the needs, markets, and conditions of tomorrow that packaging professionals must always turn their attention.
The forces that drove packaging during the Industry Revolution continue to operate today. The consumer society continues to grow and is possibly best described by a 1988s bumper sticker, “Born to Shop”. We consume goods today at a rate 4 to 5 times greater than we did as recently as 1935.
Most of these goods are not essential to survival; they constitute what we may call “the good life”.
In the second half of the 20th century, the proliferation of goods was so high that packaging was forced into an entirely new role, that of providing the motivation rather than presenting the goods itself. On a shelf of 10 competing products, all of them similar in performance and quality, the only method of differentiating became the package itself.
Marketer aimed at lifestyles, emotional values, subliminal images, features, and advantages beyond the basic product rather than the competitor’s. In some in instances, the package has become the product, and occasionally packaging has become entertainment.
A brand product to carry the product manufacturer or product sales of the retailer’s label, usually by the buyer as a quality assessment guidance. In some cases, competing brands of product quality is almost no difference, a difference is the sale of its packaging. An interesting visually attractive packaging can give a key marketing advantage and convince impulse spending. However, the packaging should accurately reflect the quality of products/brand value in order to avoid the disappointment of consumers, encourage repeat purchases and build brand loyalty. Ideally, the product should exceed customer expectations.
2. Packaging and the Modern Industrial Society
The importance of packaging to a modern industrial society is most evident when we examine the food-packaging sector. Food is organic in nature, having an animal or plant source. One characteristic of such organic matter is that, by and large, it has a limited natural biological life. A cut of meat, left to itself, might be unfit for human consumption by the next day. Some animal protein products, such as seafood, can deteriorate within hours.
The natural shelf life of plant-based food depends on the species and plant involved. Pulpy fruit portions tend to have a short life span, while seed parts, which in nature have to survive at least separated from the living plant are usually short-lived.
In addition to having a limited natural shelf life, most food is geographically and season-ally specific. Thus, potatoes and apples are grown in a few North American geographical regions and harvest during a short maturation period. In a world without packaging,we would need to live at the point of harvest to enjoy these products, and our enjoyment of them would be restricted to the natural biological life span of each.
It is by proper storage, packaging and transport techniques that we are able to deliver fresh potatoes and apples, or the products derived from them, throughout the year and throughout the country. Potato-whole, canned, powdered, flaked, chipped, frozen, and instant is available, anytime, anywhere. This ability gives a society great freedom and mobility. Unlike less-developed societies, we are no longer restricted in our choice of where to live, since we are no longer tied to the food-producing ability of an area. Food production becomes more specialized and efficient with the growth of packaging. Crops and animal husbandry are moved to where their production is most economical, without regard to the proximity of a market. Most important, we are free of the natural cycles of feast and famine that are typical of societies dependent on natural regional food-producing cycles.
Central processing allows value recovery from what would normally be waste by products of the processed food industry from the basis of other sub-industries. Chicken feathers are high in protein and, properly mill and treated, can be fed back to the next generation of chickens. Vegetable waste is fed to cattle or pigs. Bagasse, the waste cane from sugar pressing, is a source of fiber for papermaking. Fish scales are refined to make additives for paints and nail polish.
The economical manufacture of durable goods also depends on good packaging. A product's cost is directly related to production volume. The business drive to reduce costs in the supply chain must be carefully balanced against the fundamental technical requirements for food safety and product integrity, as well as the need to ensure an. efficient logistics service. In addition, there is a requirement to meet the aims of marketing to protect and project brand image through value-added pack design. The latter may involve design inputs that communicate distinctive, aesthetically pleasing, ergonomic, functional and/or environmentally aware attributes. But for a national or international bicycle producer to succeed, it must be a way of getting the product to a market, which may be half a world away. Again, sound packaging, in this case distribution packaging, is a key part of the system.
Some industries could not exist without an international market. For example, Canada is a manufacturer of irradiation equipment, but the Canadian market (which would account for perhaps one unit every several years) could not possibly support such a manufacturing capability. However, by selling to the world, a manufacturing facility becomes viable. In addition to needing packaging for the irradiation machinery and instrumentation, the sale of irradiation equipment requires the sale packaging and transport of radioactive isotopes, a separate challenge in itself. In response to changing consumer lifestyles, the large retail groups and the food service industry development. Their success has been involved in a competition fierce hybrid logistics, trade, marketing and customer service expertise, all of which is dependent on the quality of packaging. They have in part led to the expansion of the dramatic range of products offered, technology innovation, including those in the packaging. Supply retail, food processing and packaging industry will continue to expand its international operations. Sourcing products around the world more and more to assist in reducing trade barriers. The impact of the decline has been increased competition and price pressure. Increased competition led to the rationalization of industrial structure, often in the form of mergers and acquisitions. Packaging, it means that new materials and shapes, increased automation, packaging, size range extension of lower unit cost. Another manufacturer and mergers and acquisitions, the Group's brand of retail packaging and packaging design re-evaluation of the growing development of market segmentation and global food supply chain to promote the use of advanced logistics and packaging systems packaging logistics system is an integral part of, and played an important role in prevention in the food supply or reduce waste generation.
3. World Packaging.
This discussion has referred to primitive packaging and the evolution of packaging functions. However, humankind's global progress is such that virtually every stage in the development of society and packaging is present somewhere in the world today. Thus, a packager in a highly developed country will agonize over choice of package type, hire expensive marketing groups to develop images to entice the targeted buyer and spend lavishly on graphics. In less-developed countries, consumers are happy to have food, regardless of the package. At the extreme, consumers will bring their own packages or will consume food on the spot, just as they did 2000 years ago.
Packagers from the more developed countries sometimes have difficulty working with less-developed nations, for the simple reason that they fail to understand that their respective packaging priorities are completely different. Similarly, developing nations trying to sell goods to North American markets cannot understand our preoccupation with package and graphics.
The significant difference is that packaging plays a different role in a market where rice will sell solely because it is available. In the North American market, the consumer may be confronted by five different companies offering rice in 30 or so variations. If all the rice is good and none is inferior, how does a seller create a preference for his particular rice? How does he differentiate? The package plays a large role in this process.
The package-intensive developed countries are sometimes criticized for over packaging, and certainly over-packaging does exist. However, North Americans also enjoy the world's cheapest food, requiring only about 11 to 14% of our disposable income. European food costs are about 20% of disposable income, and in the less-developed countries food can take 95% of family income.
4. The status and development trend of domestic and international packaging machinery
Worldwide, the history of the development of the packaging machinery industry is relatively short, science and technology developed in Europe and America in general started in the 20th century until the 1950s the pace greatly accelerated.
From the early 20th century, before the end of World War II World War II,medicine,food, cigarettes,matches,household chemicals and other industrial sectors, the mechanization of the packaging operations; the 1950s, the packaging machine widely used common electric switches and tube for the main components of the control system to achieve the primary automation; 1960s, Electrical and optical liquid-gas technology is significantly increased in the packaging machine, machines to further expand on this basis a dedicated automated packaging line; the 1970s, the micro- electronic technology into the automation of packaging machines and packaging lines, computer control packing production process; from the 1980s to the early 1990s, in some field of packaging, computer, robot application for service, testing and management, in preparation for the over-flexible automatic packaging lines and "no" automatic packaging workshop.
Actively promoted and strong co-ordination of all aspects of society, and gradually establish a packaging material, packaging, printing, packaging machinery and other production sectors, and corresponding to the research, design, education, academic, management and organization, and thus the formation of independent and complete. The packaging of light industrial system, and occupies an important place in the national economy as a whole. Based on recent years data that members of the World Packaging Alliance output value of the packaging industry accounts for about 2% of the total output value of the national economy; in which the proportion of packaging machinery, though not large, but the rapid development of an annual average of almost growing at a rate of about 10%. Put into use at the packaging machine is now more than thousand species of packaging joint machines and automated equipment has been stand-alone equate. According to the new technological revolution in the world development trend is expected to packaging materials and packaging process and packaging machinery will be closely related to obtain the breakthrough of a new step, and bring more sectors into the packaging industry.
China Packaging Technology Association was established in 1980. Soon, the China National Packaging Corporation have been born. Since then, one after another in the country organized a national and international packaging machinery exhibition, seminars, also published I had the first ever "China Packaging Yearbook and other packaging technology books. All this indicates that China is creating a new packaging historical period.
1.2中文翻譯
現(xiàn)代包裝
1、不斷變化的需求和新的角色,
回顧以往,包裝所帶來明顯的歷史性變化是可以理解的, 一個產(chǎn)品包裝方式的給他們的銷量帶來的影響也是顯而易見的。包裝會給明天帶來什么樣的影響是難以預料的。然而,包裝專業(yè)人員是未來市場的需求,必須始終注意力放在他們身上。包裝是工業(yè)革命的動力,繼續(xù)經(jīng)營的必須品。隨著社會消費的持續(xù)增長,20世紀80年代的包裝可能是銷量最好的保證。今天我們消費的商品率大于我們在 1935年4至5倍。這些貨物大多是沒有生存的必要條件;他們構成什么,我們可以稱之為“美化生活”.
在下半年的20世紀,商品的擴散是如此之高,包裝,被迫進入一個全新的角色,它已經(jīng)成為主要的購買動機而不是只靠提供貨物本身的價值。貨架上的競爭產(chǎn)品,包裝本身成為區(qū)分所有這些類似商品的性能和質量的唯一方法。生活方式,情感價值,潛意識的圖像,功能,優(yōu)勢超出基本產(chǎn)品本身的東西,成為營銷的方式,將使他們的產(chǎn)品比競爭對手更容易獲得消費者的青睞。在一些實例中,包裝已成為產(chǎn)品,和偶爾的包裝已成為娛樂。一個產(chǎn)品的品牌標簽攜帶該產(chǎn)品的制造商或產(chǎn)品銷售零售商,一般是買方作為質量評估的指導。有時,競爭品牌的產(chǎn)品品質是幾乎沒有區(qū)別,有區(qū)別的是它,的包裝銷售。包裝可以給消費者一個有趣的視覺吸引力,這個關鍵的營銷優(yōu)勢可以說服消費者有消費的沖動。然而,為了避免消費者失望,鼓勵消費者重復購買和建設品牌的忠誠度,包裝應準確地反映產(chǎn)品質量和品牌價值。理想的情況下,產(chǎn)品應超越客戶的期望。
2、 包裝和現(xiàn)代工業(yè)社會
我們檢查食品部門時,表現(xiàn)得最為明顯包裝對現(xiàn)代社會工業(yè)的重要性。所有食物在本質上是有機的,包括動物或植物??偟膩碚f,它有有限的自然生物生命是這種有機物質的特點之一。切下的肉,留到第二天,可能已經(jīng)不適合人類食用了。一些動物性蛋白質的產(chǎn)品,如海鮮,可以在數(shù)小時內(nèi)壞掉。
天然的植物為基礎的食品貨架壽命取決于涉及的品種和植物。水果部分往往有一個很短的壽命而變腐爛,種子部分,有更長的壽命,在自然界生存直到下一個生長季節(jié)。從活體植物分開的莖和葉保質期通常也是短暫的。
除了有一個有限的自然保質期,大多數(shù)食品保質同地理和季節(jié)是息息相關的。例如,生長在北美一些地區(qū)土豆和蘋果的成熟期很短造成收獲時間也很短。在一個沒有包裝的世界里,收獲的時候和我們享受他們的時候將會受到每個生物本身壽命的限制。通過適當?shù)膬Υ?、包裝和運輸?shù)募夹g,使我們能夠在一年四季向全國各地提供新鮮的土豆和蘋果,從中獲得更好的產(chǎn)品,例如馬鈴薯有整體、罐頭、粉狀、片狀、芯片,冰凍各種方式的包裝,讓我們在任何時候、任何地方都,可以隨時食用。這種能力使社會具有極大的自由和機動性。與欠發(fā)達的社會相比,我們不再受到在哪里居住的局限性,因為我們不再依賴于一個地區(qū)的糧食生產(chǎn)的能力。隨著包裝的快速發(fā)展,糧食生產(chǎn)變得更加專業(yè)化和高效化。他們可以生產(chǎn)最 經(jīng)濟的作物和畜牧業(yè),而不用考慮附近有沒有市場。最重要的是,我們不再靠自然循環(huán)來決定饑荒還是豐收,是典型的社會依賴天然食品生產(chǎn)的區(qū)域。
食品加工行業(yè)的產(chǎn)品從其他子行業(yè)的基礎上,通過控制處理可以獲得廢物的回,收的價值。雞毛是高蛋白,適當?shù)募庸ず吞幚?做成飼料,可以反饋到雞的下一代。廢棄的蔬菜可以喂養(yǎng)?;蜇i。甘蔗糖的廢物甘蔗渣,是用于造紙的纖維來源。魚鱗可以提煉出涂料和指甲油的添加劑。
一個產(chǎn)品的成本直接關系到生產(chǎn)量,減少供應鏈中的成本一定要仔細,它是驅動業(yè)務拓展的動力,反對對食品安全的基本技術要求和平衡產(chǎn)品的完整性,以及需要確保一個高效的物流服務。 此外,經(jīng)濟耐用物品的制造還取決于良好的包裝。還有一個要求,品牌形象包裝設計要保護項目通過和增值,以滿足市場營銷的目標。后者可能涉及鮮明,美觀,符合人性化要求,同時要附帶溝通功能和環(huán)保意識的屬性。但是,對于一個國家或國際自動包裝生產(chǎn)產(chǎn)品的成功,它必須獲得市場,這可能是一種方式。再次要塑造完善的包裝,在這種情況下選擇分銷包裝是一個系統(tǒng)的關鍵部分。
有些行業(yè)可能沒有國際市場的存在。例如,加拿大是一個輻射設備的制造商,但在加拿大市場(這或許一個單位占每隔幾年)不可能支持這樣的制造能力。然而,一個包裝制造工廠的產(chǎn)生成功使其產(chǎn)品暢銷世界。除了需要照射機械和儀器儀表的包裝,放射性同位素輻照設備的銷售也需要銷售包裝和運輸?shù)?這是一個挑戰(zhàn),需要安全的包裝和運輸放射性同位素,這本身就是一個特殊的挑戰(zhàn)。在回應消費者不斷變化的生活方式,大型零售集團和食品服務行業(yè)發(fā)展。他們的成功已經(jīng)成為一個競爭激烈的混合后勤,貿(mào)易、市場營銷和客戶服務, 所有的這些依賴于高質量的包裝。他們已經(jīng)戲劇性的帶動了提供的部分產(chǎn)品范圍的擴大,使技術創(chuàng)新,包括那些包裝。供應的零售,食品加工和包裝行業(yè)將繼續(xù)以擴大其國際業(yè)務。采購世界各地產(chǎn)品越來越多的協(xié)助下,在不斷減少貿(mào)易壁壘。隨著競爭越來越激烈價格的影響一直在不斷下降。競爭的加劇導致了產(chǎn)業(yè)結構的合理化,往往以兼并和收購的形式。包裝,它意味著通過新材料和形狀, 自動化程度的提高,包裝尺寸范圍的延伸,使單位成本降低。另一個制造商和兼并和收購,本集團的零售包裝和包裝設計的市場分割和全球食品供應鏈的推廣使用先進包裝系統(tǒng)和包裝物流系統(tǒng)的日益發(fā)展是重新評估的品牌不可分割的一部分,并在食品供應和預防或減少廢物的產(chǎn)生中發(fā)揮重要作用,。
3、世界包裝
這個討論已經(jīng)提到原始包裝和包裝功能的演變。然而,人類的全球性進展是,幾乎是在世界每一個地方社會發(fā)展都有包裝發(fā)展的階段。因此,包裝機在高度發(fā)達的國家,選擇合適耐用的封裝類型,雇傭高價的設計團隊開發(fā)華麗的包裝外形吸引有針對性的買家,在欠發(fā)達國家,消費者很高興有食物,不管包裝。在極端情況下,就像他們在2000年前消費者將自己帶來的食品包裝當成消耗。
較發(fā)達的國家的包裝與欠發(fā)達的國家起著不同的作用,原因很簡單,他們不明白,各自包裝的重點是完全不同的,有時有困難。同樣,解決發(fā)展中國家試圖向北美市場出售令他們無法理解圖形的商品包裝是我們的當務之急。顯著的區(qū)別是,包裝在市場中起著不同的作用,產(chǎn)品價值將單獨出售,因為它是可用的。在北美市場上,消費者可能會面臨由五個不同的公司提供各種不同范圍的選擇。如果所有的產(chǎn)品是好的,都不遜色,賣家如何讓消費者產(chǎn)生對自己產(chǎn)品的偏好?他是如何區(qū)分的?包裝在這一過程中起著很大的作用。
包密集型發(fā)達國家有時也批評了包裝,當然不存在過度包裝。然而,北美也享有世界上最便宜的食品,要求我們的可支配收入僅約11至14%。歐洲食品成本是可支配收入的約20%,而在欠發(fā)達國家的食品可以支配家庭收入的95%。
4、國內(nèi)外包裝機械現(xiàn)狀及發(fā)展趨勢
在世界范圍內(nèi),包裝機械工業(yè)的發(fā)展歷史比較短些,科學技術發(fā)達的歐美各國大體上是在20世紀起步的,及至50年代步伐才開始大為加快。
從20世紀初到第二次世界大戰(zhàn)大戰(zhàn)結束前,在醫(yī)藥、食品、卷煙、火柴、日用化工等工業(yè)部門實現(xiàn)了包裝作業(yè)的機械化; 50年代,包裝機的廣泛采用以普通電開關和電子管為主要元件的控制系統(tǒng),實現(xiàn)了初級自動化; 60年代,包裝機中采用,機電光液氣綜合技術明顯增多,機種進一步擴大,在此基礎上實現(xiàn)了專用的自動包裝線: 70年代,將微電子技術引入自動化包裝機和包裝線,實現(xiàn)了有電子計算機控制的包裝生產(chǎn)過程;從80年代到90年代初開始,在某些包裝領域里將微機、機器人更多地應用到供送、檢測、管理等方面,準備向柔性自動包裝線和“無人化”自動包裝車間過度。
由于社會上各方面的積極推動和有力配合,逐步建立起包裝材料、包裝印刷、包裝機械等生產(chǎn)部門和與之相適應的科研、設計、教育、學術、管理等組織機構, 進而形成了獨立完整的包裝輕工業(yè)體系,且在整個國民經(jīng)濟中占據(jù)著重要地位。根據(jù)近幾年的資料得知,世界包裝聯(lián)盟成員國包裝工業(yè)的總產(chǎn)值大約占國民經(jīng)濟總產(chǎn)值的2%左右;其中包裝機械所占的比重雖然不算大,但發(fā)展迅猛,平均每年幾乎以10%左右的速率增長。現(xiàn)在投產(chǎn)使用的包裝機已超過了千余種,同時包裝聯(lián)合機及自動化的配套設備已于單機等量齊觀了。根據(jù)世界新技術革命的發(fā)展趨勢,預料包裝材料以及與此緊密相關的包裝工藝和包裝機械將會取得新一步的突破,并且?guī)痈喈a(chǎn)業(yè)部門進入包裝行業(yè)。
中國包裝技術協(xié)會于1980年成立。不久,中國包裝總公司也相繼誕生。此后,在國內(nèi)陸續(xù)地舉辦了全國性和國際性的包裝機械展覽會、學術研討會,還出版了我過有史以來第一部 《中國包裝年鑒》 及其他包裝技術書刊。這一切都標志著中國正在開創(chuàng)一個嶄新的包裝歷史時期。
2 專業(yè)閱讀書目
2.1 機械設計
內(nèi)容摘要:
蝸桿傳動是在空間交錯的兩軸間傳遞運動和動力的一種傳動機構,兩軸線交錯的夾角可為任意值,常用的為90°。這種傳動由于具有結構緊湊、傳動比大(在動力傳動中,一般傳動比i=10-80;在分度機構中,i可以達到1000)、傳動平穩(wěn)以及在一定的條件下具有可靠地自鎖性等優(yōu)點,應用較廣泛。其傳遞的最大功率可達1000kw,最大圓周速度可以達到69m/s之多。不足之處是傳動效率低,摩擦發(fā)熱大,常需耗用有色金屬,故不宜用于長期連續(xù)工作的傳動。蝸桿傳動通常用于減速裝置,也有個別機器用作增速裝置。
隨著機器功率的不斷提高,近年來陸續(xù)出現(xiàn)了多種新型的蝸桿傳動,效率低的缺點正在逐步改善。
按照蝸桿形狀的不同,蝸桿傳動可以分為圓柱蝸桿傳動、環(huán)面蝸桿傳動和錐蝸桿傳動等。(王為,汪建曉.機械設計[M].武漢:華中科技大學出版社,2011)
2.2 機械原理
內(nèi)容摘要:
實際機構往往是由外形和機構都很負載的構件和運動副所組成的。但從運動的觀點來看,構件的運動取決于運動副的類型和機構的運動尺寸(確定個運動副的相對位置的尺寸),而與構件的外形、斷面尺寸、組成構件的零件數(shù)目、固聯(lián)方式及運動副的具體結構等無關。因此,為了便于研究機構的運動,可以撇開構件、運動副的外形和具體構造,而只用簡單的線條和符號代表構件和運動副,并按比例定出各運動副的位置,表示機構的組成和傳動情況。這種能夠準確表達機構運動特性的簡明圖形就稱為機構運動簡圖。
機構運動簡圖與原機構具有完全相同的運動特性,因此,可以根據(jù)運動簡圖對機構進行結構分析、運動分析和力分析。
有時,只為了表明機構的運動狀態(tài)或各構件的相互關系,也可以不按比例來繪制運動簡圖,這樣的簡圖稱為機構示意圖。
國家標準(GB/T4460-1984)規(guī)定了機構運動簡圖的符號,表2-2所示的常用構件和運動副的表示方法摘自該標準。(魏兵,喻全余,孫未.機械原理[M].武漢:華中科技大學出版社,2007)
2.3 機電一體化系統(tǒng)設計
內(nèi)容摘要:
機電一體化是在微電子技術、計算機技術、信息技術向機械工業(yè)滲透過程中逐漸形成并發(fā)展起來的一門新興的綜合性技術學科。目前,機電一體化技術已受到普遍重視,并廣泛應用于機械制造、儀器儀表、電氣信息、醫(yī)療設備、交通運輸、航空航天等行業(yè),已成為現(xiàn)代技術和經(jīng)濟發(fā)展中不可缺少的一種高新技術;機電一體化技術應用生產(chǎn)的機電一體化產(chǎn)品已遍及人們?nèi)粘I詈蛧窠?jīng)濟的各個領域。為了在當今國際范圍內(nèi)激烈的技術、經(jīng)濟競爭中占據(jù)優(yōu)勢,世界各國紛紛將機電一體化的研究和發(fā)展作為一項重要內(nèi)容而列入本國的發(fā)展計劃。21世紀我國將成為世界制造業(yè)的重要基地,因此機電一體化系統(tǒng)設計成為機械、自動控制等專業(yè)較重要的一門專業(yè)課程。機電一體化是一門實踐性非常強的綜合性技術學科,所涉及的知識領域非常廣泛,現(xiàn)代各種先進技術構成了機電一體化的技術基礎。但機電一體化并非是這些技術的簡單疊加,它的靈魂是突出強調這些技術的相互滲透和有機結合,從而形成某一單項技術所無法達到的優(yōu)勢,并將這種優(yōu)勢通過性能優(yōu)異的機電一體化產(chǎn)品而體現(xiàn)出來,轉化成強大的生產(chǎn)力。(馮浩,汪建新,趙書尚,楊威.機電一體化系統(tǒng)設計[M].華中科技大學出版社, 2016)
2.4 Creo2.0機械設計教程
內(nèi)容摘要:
定義拉伸特征類型
在選擇命令后,繪圖區(qū)上方會出現(xiàn)“拉伸”操控板。在操控板中,按下“實體特征類型”按鈕(默認情況下,此按鈕為按下狀態(tài))。
說明:利用拉伸工具,可以創(chuàng)建如下幾種類型的特征。
實體類型:按下操控板中的“實體特征類型”按鈕,可以創(chuàng)建實體類型的特征。在由截面草圖生成實體時,實體特征的截面草圖完全由材料填充,并沿草圖平面的法向伸展來生成實體,如圖3.1.7所示。
曲面類型:按下操控板中的“曲面特征類型”按鈕,可以創(chuàng)建一個拉伸曲面。在Creo 2.0中,曲面是一種沒有厚度和重量的片體幾何,但通過相關命令操作可變成帶厚度的實體,如圖3.1.8所示。
薄壁類型:按下“薄壁特征類型”按鈕,可以創(chuàng)建薄壁類型的特征。在由截面草圖生成實體時,薄壁特征的截面草圖則由材料填充成均厚的環(huán),環(huán)的內(nèi)側、外側或中心輪廓線是截面草圖,如圖3.1.9所示。(詹友剛.Creo2.0機械設計教程[M],機械工業(yè)出版社, 2013)
2.5 單片機原理及接口技術
內(nèi)容摘要:
計算機由運算器、控制器、存儲器、輸入設備和輸出設備5個部分組成,如圖所示。迄今為止,計算機的發(fā)展經(jīng)歷了電子管、晶體管、集成電路、大規(guī)模及超大規(guī)模集成電路等幾個階段。隨著微電子技術的發(fā)展,運算器和控制器被集成到一塊芯片上,形成了微處理器(Microprocessor)或稱為CPU,20世紀70年代出現(xiàn)了以CPU為核心的微型計算機(Microcomputer),它是大規(guī)模及超大規(guī)模集成電路的產(chǎn)物。目前,計算機正在向巨型化、單片化、網(wǎng)絡化3個方向發(fā)展。巨型化的目的在于不斷提高計算機的運算速度和處理能力,以解決復雜系統(tǒng)計算和高速數(shù)據(jù)處理的問題,比如系統(tǒng)仿真和模擬、實時運算和處理。單片化就是把計算機系統(tǒng)盡可能集成在一塊半導體芯片上,其目的在于計算機微型化和提高系統(tǒng)的可靠性,通常把這種單片計算機簡稱單片機。
計算機是如何工作的呢?計算機是一臺機器,它不可能主動地、自覺地完成某項指定的任務。當使用計算機解決某個具體問題時,并不是把問題直接交給計算機去解決,而是采用以下方法:首先,根據(jù)解決問題的方案,用計算機可以“理解”的語言,編寫出一系列解決這個問題的步驟(即程序);然后,將這些步驟輸入到計算機中,命令計算機按照這些事先擬定的步驟順序執(zhí)行,從而使問題得以解決。編寫解決問題步驟的工作就是程序設計或軟件開發(fā)。(張毅剛,劉旺,鄧立寶.單片機原理及接口技術[M],人民郵電出版社, 2016)
2.6 機械設計課程設計
內(nèi)容摘要:
機器通常由原動機、傳動裝置和工作機三部分組成。傳動裝置將原動機的動力和運動傳遞給工作機,合理擬定傳動方案是保證傳動裝置設計質量的基礎。在課程設計中,學生應根據(jù)設計任務書,擬定傳動方案。
合理的傳動系統(tǒng)方案,除了應滿足工作機性能要求、適合工況條件及工作可靠外,還應使傳動系統(tǒng)結構簡單、尺寸緊湊、加工方便、成本低廉、效率高及便于使用和維護等。要同時滿足這許多要求常常是困難的,在進行傳動系統(tǒng)方案設計時應統(tǒng)籌兼顧、保證重點。
當采用幾種傳動形式組成多級傳動時,擬定運動方案要合理布置其傳動順序,重點要注意以下幾點。
(1)帶傳動承載能力較低,在傳遞相同轉矩時結構尺寸較嚙合傳動大;但帶傳動平穩(wěn),能吸振緩沖,應盡量置于傳動系統(tǒng)的高速級;這樣,轉速較高,傳遞相同功率時的扭矩較小。
(2)滾子鏈傳動運轉不均勻有沖擊時,套筒滾子鏈不適于高速傳動,宜布置在傳動系統(tǒng)的低速級。
(3)圓錐齒輪的模數(shù)增大后加工更為困難,一般應將其置于傳動系統(tǒng)的高速級,且對其傳動比加以限制;但需注意當錐齒輪的速度過高時,其精度也需相應地提高,因此會增加制造精度要求和成本。
(4)斜齒輪傳動的傳動平穩(wěn)性較直齒輪好,相對地可用于高速級;開式齒輪傳動一般,工作環(huán)境較差,潤滑條件不良,故壽命較短,對外廓的緊湊性要求低于閉式傳動,相對應布置在低速級。
(5)蝸桿傳動的傳動比大,承載能力較齒輪傳動低,常布置在傳動系統(tǒng)的高速級,以獲得較小的結構尺寸和較高的齒面滑動速度,易于形成流體動壓潤滑油膜,提高承載能力和傳動效率。
(6)傳動裝置的布局要求結構緊湊、勻稱、強度和剛度好。(唐增寶,常建娥.機械設計課程設計[M],華中科技大學出版社,2011)
2.7 現(xiàn)代工程制圖
內(nèi)容摘要:
在工程設計中,為了正確地表達儀器、設備的形狀、結構和材料等內(nèi)容,設計者通常把物本按一定的投影方法并遵守有關的規(guī)定繪制出圖紙,用以表達設計思想,這種圖稱為工程圖。工程圖是加工、制造、檢驗儀器和設備的依據(jù)。在使用儀器和設備時,也需要通過工程圖了解義器和設備的結構和性能。工程圖是工程界的一種重要技術文件,也是工程界進行技術交流的工具,因此工程圖樣被稱為工程界的語言。
在現(xiàn)代工業(yè)生產(chǎn)中,工程圖樣作為表達構思、設計和傳遞制造工程與產(chǎn)品信息的主要媒介,在國民經(jīng)濟各領域的技術工作和管理工作中有著廣泛的應用。在科學研究中,圖形能直觀表達實驗數(shù)據(jù)、反映科學規(guī)律,對于人們把握事物的內(nèi)在聯(lián)系,掌握問題的變化趨勢,具有重要意義。圖形的形象性、直觀性和簡潔性,是人們認識規(guī)律、探索未知的重要工具。因此。工程圖學對于新世紀大學生是一種素質,是一種工具,是培養(yǎng)創(chuàng)新思維的基礎知識。
工程圖學課程是高等工科學校各專業(yè)的一門技術基礎課。其理論嚴謹,與工程聯(lián)系緊密,實踐性強,是后續(xù)專業(yè)課程教育的基礎。該課程是一門研究在平面上圖示空間幾何元素和物體、圖解空間幾何問題的原理與方法,研究計算機繪圖的理論、知識和技能,以及根據(jù)工程技術的規(guī)定和知識來繪制、閱讀工程圖樣的學科。本課程將以正投影的基本原理為理論基礎,講述工程圖樣在構思、設計、圖解空間幾何問題的過程中,以及分析、研究自然界與工程界的客觀規(guī)律中的應用,同時盡量反映專業(yè)設計領域的最新設計手段和方法。(陸載涵,劉桂紅,張哲.現(xiàn)代工程制圖[M],機械工業(yè)出版社, 2013)
2.8 機械零部件選用與設計
內(nèi)容摘要:
隨著生產(chǎn)和科學技術的發(fā)秩,機器的定義也不斷發(fā)展和完善,現(xiàn)代機器是指由兩個以上廣義構件組成的系統(tǒng),將原動〈動力〉機的動力和運動變換為執(zhí)行機構所需要的力和運動.作有用功或進行能量轉換,在人或其他智能體的操縱和控制下,實現(xiàn)所設計機器的預期功能,
現(xiàn)代機器定義中強調3個新概念:一是“廣義構件":二是“功能":三是“智能控制”,
所謂“構件'是指機器中的運動單元,構件可能是一個零件(構件單元〉,也可能是若干個零件的固
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