【導讀】學生獲得綜合訓練，對培養(yǎng)學生的實際工作能力具有十分重要的作用。畢業(yè)設計（論文）工作由省級電大統(tǒng)一安排。如調(diào)查研究、查閱文獻和收集資。3．檢驗學生綜合素質(zhì)與實踐能力，是學生畢業(yè)及學位資格認證的重要依據(jù)。3．學生應樹立正確的設計思想，有嚴肅認真的科學態(tài)度，嚴謹求實的工作作風。合本科生畢業(yè)論文規(guī)范。正文不低于5000字。5．畢業(yè)設計圖紙能較好的表達設計意圖，符合制圖國家標準，提倡計算機繪圖。學校、科研單位等具有相應職稱的教師擔任指導教師。2．指導教師應變寫畢業(yè)設計任務書，指導過程中，根據(jù)學生完成工作情況填寫。5．每位指導教師指導的學生人數(shù)以不超過8人為宜。合訓練為目的，有利于培養(yǎng)學生獨立工作能力，鞏固和提高所學知識。員會成員報省、市級電大備案。每名學生答辯時間為15分鐘左右，包括。2．由省級電大在答辯結(jié)束后，進行總結(jié)，寫出書面材料，報中央電大教務處。

　　

【正文】 19 致 謝 首先感謝母校，是她給我一個難得的學習機會，讓我在即將畢業(yè)之際學到了很多知識，經(jīng)過這幾個月的緊張的畢業(yè)設計，使我在理論和動手能力上都有了進一步的提高。 我的畢業(yè)設計主要在劉老師指導下 ,讓我對所學的知識進行系統(tǒng)性的復習 ,并根據(jù)寫作要求查閱有關(guān)資料。在設計過程中受到劉老師無微不至的關(guān)心與耐心指導，使我的畢業(yè)設計得以順利的進展。在劉老師幫助下我解決了很多以前解決不了的問題 ,在此我向您表示衷 心的感謝！同時也要感謝各位老師和同學，是你們讓我的學習和生活充滿樂趣，感謝你們！謝謝 ! 作為一名即將完成學業(yè)，離開學校生活的我，我要感謝母校，是她給我創(chuàng)造了一個學習的機會，創(chuàng)造了美好的學習生活環(huán)境，讓我在這里學到了很多知識；感謝各位老師，是他（她）們傳授給我的知識；感謝各位同學和朋友，是他們讓我的學習和生活充滿樂趣，感謝你們！ 經(jīng)過這次設計，提高了我很多的能力，比如實驗水平、分析問題的能力、合作精神、嚴謹?shù)墓ぷ髯黠L等。在這期間凝結(jié)了很多人的心血，在此表示衷心的感謝。沒有他們的幫助，我將無法順利完成這次設計。 在設計期間老師幫助我收集文獻資料，理清設計思路，指導實驗方法，提出有效的改進方案。導師淵博的知識、嚴謹?shù)慕田L、誨人不倦的態(tài)度和學術(shù)上精益求精的精神使我受益終生。 20 附錄： 外文資料 Thesis First, the development history of China39。s NC system 1. China from 1958 onwards, by a group of research institutes, colleges and universities and a few machine tool plant started to conduct research and development of numerical control system. At that time due to the low level of domestic electronic ponents, departments, economic and other constraints, unable to obtain a larger development. 2. In the reform and opening up, China was gradually numerical control technology to achieve substantial development. After 65 (81 85 years) and the introduction of foreign technology, 75 (86 90 years) is digested and absorbed and the 85 (91 ~ 1 95 years) national anizations, scientific and technological research, that make our country39。s CNC technology has been a qualitative leap, when the acceptance through national research and identification of products, including Beijing39。s ChinaI Mount Everest, central China39。s central NC Itype and highgrade CNC Shenyang National Engineering Research Center of the blue sky I, and others through the National Quality Supervision and Testing Center machine test qualified domestic CNC systems such as Nanjing, four open pany39。s products. 3. China39。s CNC machine tool manufacturing industry in the 80 years have had the stage of rapid development, many machine tool plant products from traditional products to achieve the transition to the CNC. However, in general, technical level is not high, poor quality, so in the early 90s to face the national economy from planned economy to a market economy and the transfer of adjustment, has experienced the most difficult Depression years, when production dropped to 50 %, stocks more than four months. From 1995, 95 after the country from the start the machine tool market to expand domestic demand to strengthen the restrictions on the approval of imports of CNC equipment, the investment and key support for key numerical control system, equipment, technology research, to CNC equipment has played a significant role in promoting , especially in 1999, the state and the key to the defense industry into a large number of civilian industrial sector funds for technological renovation, so that numerical control equipment manufacturing market prospered. 2, CNC Technology and Equipment of vehicles cutting Read: 133 CNC lathe processing technology and lathe processing technology is similar, but because of CNC lathe is a setup, continuous automatic processing to plete all the turning process, and therefore should pay attention to the following areas. 1. A reasonable amount of selection cutting For the high efficiency of metal cutting, being processed materials, cutting tools, cutting conditions are the three elements. These determine the processing time, tool life and processing quality. Costeffective way of processing must be a reasonable choice of cutting conditions. 21 The three elements of cutting conditions: cutting speed, feed rate and cutting depth of the damage directly caused by knives. With the increase in cutting speed, tip temperature rise will result in mechanical, chemical, thermal wear and tear. 20% increase in cutting speed, tool life will reduce the 1 / 2. Feed conditions and tool wear later in the context of relations in the small produce. However, a large quantity of feed, cutting temperature rise, followed by wearing big. Than the impact of cutting speed on tool small. The impact of depth of cut on tool cutting speed and feed though not large, but in a small cutting depth of cut when he was cutting materials produce hardened layer, it will also affect the tool life. The user is processed according to the material, hardness, cutting the state, material type, feed rate, cutting depth, etc. choose to use the cutting speed. The most suitable processing conditions are selected on the basis of these factors the selected. There is a regular, stable life of the wear and tear to achieve the ideal conditions. However, in practical operation, the tool life of choices and tool wear, dimensional changes are processed, surface quality, cutting noise, heat and other related processing. In determining processing conditions, the need to study the actual situation. For the stainless steel and heatresistant alloys difficult to machine materials, the coolant can be used or to choose a good blade rigid. 2. Rational choice tool A) rough car, to select high strength and durability a good tool in order to meet the rough car back to eat large amount of knives, large feed requirements. 2) fine car, to select high precision, durability good tool to ensure the machining accuracy requirements. 3) To reduce tool change time and convenience of the knife, should maximize the use of machines and machine clip folder knife blades. 3. Rational choice Fixture 1) have tried to use universal fixture clamping the workpiece to avoid the use of special fixture。 2) Part positioning base overlap in order to reduce positioning error. 4. Determine the processing route Processing line is the indexcontrolled machining process, the tool relative parts trajectory and direction. 1) should be able to ensure the mach