【正文】 virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。父母不僅在經(jīng)濟上承受了巨大的負擔，在心里上更有思子之情的煎熬與望子成龍的期待。 Z 軸退刀 57 。 Z 向進刀 41 T0300。 選擇停 25 N1200 G96 S120 T0300。 建立刀具長度補償，刀具正轉(zhuǎn) 9 。為了區(qū)分不同的程序，故在程序的最前端加上程序號碼以區(qū)分。 （ 1）高速、高效化。 20 世紀 60 年代末，先后出現(xiàn)了由一臺計算機直接控制多臺機床的直接數(shù)控系統(tǒng)，及采用小型計算機控制的計算機數(shù)控系統(tǒng)，使數(shù)控系統(tǒng)進入了以小型計算機化為特征的第四代。 1952 年美國研制出世界上第一臺數(shù)控銑床，開創(chuàng)了世界數(shù)控機床發(fā)展的先河。 ========畢業(yè)論文 第 6 頁 共 14 頁 數(shù)控加工技術概況 隨著科學技術的不斷發(fā)展，社會對產(chǎn)品多樣化的要求日益強烈，產(chǎn)品更新?lián)Q代悅來越快，多品種、中小批量生產(chǎn)的比重明顯增加，復雜形狀的零件越來越多，精 度要求也越來越高。集體的說，下面這些類型的零件最適合于數(shù)控加工。 ========畢業(yè)論文 第 8 頁 共 14 頁 數(shù)控加工工藝的特點 （ 1）內(nèi)容十分明確而具體 （ 2）工藝工作要求相當準確而嚴密 （ 3）采用多坐標聯(lián)動自動控制 加工復雜表面 （ 4）采用先進的工藝裝備 （ 5）采用工序集中 數(shù)控加工工藝的主要能容 （ 1）選擇適合在數(shù)控機床上加工的零件，確定數(shù)控機床加工內(nèi)容 （ 2）對零件樣圖進行數(shù)控加工工藝分析，明確加工內(nèi)容及技術要求 （ 3）具體設計數(shù)控加工工序 （ 4）處理特殊工藝問題 （ 5）編程誤差及其控制 （ 6）處理數(shù)控機床上部分工藝指令 數(shù)控機床的合理選用 （ 1）形狀尺寸適應性 （ 2）加工精度適應性 （ 3）節(jié)拍適應性 控加工工藝分析與工藝設計 數(shù)控機床加工中所有工部的刀具選擇、走刀軌跡、切削用量、加 工余量等都是要預先確定好并編入加工工序。在數(shù)控編程中，用各種 G代碼和 M代碼來描述工藝過程的各種操作和運動特征。 選擇停止 14 N1100 G96 S120 T0100。 單一固定循環(huán)第一次走刀粗車Φ40 孔 30 G00 。 建立刀補 46 G01 Z0 。 Z 向進刀 62 G40 T0700 M09。s time for the wild fruits to ripe. The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade ========畢業(yè)論文 第 17 頁 共 14 頁 Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39。在這里，特別感謝大學三年學習期間給我諸多教誨和幫助的各位老師，你們給予我的指導和教誨我將永遠記在心里！ 感謝和我一起生活 3 年的室友，是你們讓我們的寢室充滿快樂與溫馨， “君子和而不同”，我們正是如此！愿我們以后的人生都可以充實、多彩與快樂！ 感謝我 的同學們，謝謝你們給予我的幫助！ 回首本人的求學生涯，父母的支持是本人最大的動力。 倒角 56 G00 。 x 向退刀 40 。 返回起刀點 24 M01。 建立工件坐標系，冷卻液開 8 G00 X0 T1111 M03。 式中： N：程序段地址碼，用于指令程序段號； G：指令動作方式的準備功能地址 X：坐標軸地址 F：進給量指令地址 程序號 目前計算機數(shù)控機床，都具有記憶程序的功能，能將程序存儲在內(nèi)存中。當前，世界數(shù)控技術及其裝備發(fā)展趨勢主要體現(xiàn)在以下幾個方面。 1965 年出 現(xiàn)了第三代的集成電路數(shù)控系統(tǒng)，不僅體積小，功率低，而且可靠性提高，價格進一步下降，促進了數(shù)控機床品種和產(chǎn)量的發(fā)展。 關鍵詞： 數(shù)控技術核心；數(shù)控裝備；高精尖 鄭州華信學院畢業(yè)論文 Abstract Digital Control (number control) referred to as NC (NC), developed a kind of modern automation technology is the use of digital information to achieve a method of control of machinery and equipment. With the continuous development of science and technology, the munity has increasingly stronger demands for product diversification, product upgrading Panda faster, multispecies, a marked increase in the proportion of small and medium volume production, plexshaped parts, more and more the more precision to the higher. In addition, the intense petition in the market demands shorter and shorter product development cycle, the traditional processing equipment and manufacturing methods are difficult to adapt to this diversity, flexible highperformance parts with plex shapes, highquality processing requirements. Thus, in recent decades, can effectively solve the plex, sophisticated,