【正文】 s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39。 Festival. In this day, girls will throw a sewing needle into a bowl full of water on the night of Qixi as a test of embroidery skills. If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders. Single women also pray for finding a good husband in the future. And the newly married women pray to bee pregnant quickly. Tradition transformed The love story of Niulang and Zhinu, and the Qixi Festival have been handed down for generations. Yet these ancient traditions and customs are slowly dying out. Many modern Chinese, particularly youngsters, seem to know more about St Valentine39。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 中南林業(yè)科技大學(xué)模具設(shè)計(jì)與制造 20 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 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。 ll wait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the uping Golden Week it may not be a bad idea to avoid some of the most crowded places for now. There is always a place so fascinating that everyone yearns for. Arxan is a place like this. The beauty of Arxan is everlasting regardless of the changing of four seasons. Bestowed by nature, its spectacular seasonal landscape and mountains are just beyond word. Arxan is a crucial destination for the remended travelling route, China Inner Mongolia Arxan — Hailar — Manzhouli. It is also the joint of the four prairies across the SinoMongolian border, where people gravitate towards the exotic atmosphere mixed with Chinese, Russian, and Mongolia elements. As a historic site for the Yitian Battle, Arxan still embodies the spirit of Genghis Khan. Walking into Arxan, you will be amazed by a kaleidoscope of geous colors all the year round the Spring azaleas blooming red in the snow, the Summer sea wavering blue in the breeze, the Autumn leaves painted in yellow covering volcanic traces, and the Winter woods shining white on the vast alpine snowscape. Hinggan League Arxan city is situated in the far eastern area of Inner Mongolia Autonomous Region. Its full name Haren Arxan means hot holy water in the Mongolian language. Arxan is a tourism city in the northern frontier with a blend of large forest, grand prairies, vast snowfield, heaven lake cluster, thermium, as well as volcanic cluster. It is a rare and unique ecotourism base filled with healthy sunshine, clean air and unspoiled green. Nestled close to the country39。 最后感謝 模具 系和我的母校 — 中南林業(yè)科技 大學(xué) ， 大學(xué) 三 年來(lái)對(duì)我的大力栽培。 然后還要感謝大學(xué) 三 年來(lái)所有的老師，為我們打下 了 基礎(chǔ)；同時(shí)還要感謝所有的同學(xué)們，正是因?yàn)橛辛四銈兊闹С趾凸膭?lì)。我的設(shè)計(jì)較為復(fù)雜煩瑣，但是 劉 老師仍然細(xì)心地糾正圖紙中的錯(cuò)誤。 在這里首先要感謝我的 指導(dǎo) 老師 。根據(jù)設(shè)計(jì)任務(wù)書(shū)要求，全面檢查設(shè)計(jì)技術(shù)資料，按照指導(dǎo)教師的批改，認(rèn)真修改圖紙錯(cuò)誤，認(rèn)真修改設(shè)計(jì)說(shuō)明書(shū) . 應(yīng)該說(shuō)，在指導(dǎo)教師的認(rèn)真指導(dǎo)下，我基本完成了這套夾具的設(shè)計(jì)工作，通過(guò)這次設(shè)計(jì)，學(xué)到了很多知識(shí)和技術(shù)。充分發(fā)揮主觀能動(dòng)性，積極思考，大膽創(chuàng)新。培養(yǎng)嚴(yán)謹(jǐn)?shù)墓ぷ鲬B(tài)度和踏實(shí)的工作作風(fēng)。 我們高職學(xué)生基礎(chǔ)理論知識(shí)不夠扎實(shí)，設(shè)計(jì)能力較差，為了使我們很快地進(jìn)入工作狀態(tài)，指導(dǎo)教師耐心向我們介紹機(jī)械產(chǎn)品設(shè)計(jì)方法、一般步驟和設(shè)計(jì)過(guò)程中應(yīng)注意的事項(xiàng)。 明確課題的性質(zhì)、意義、設(shè)計(jì)內(nèi)容、設(shè)計(jì)要達(dá)到的技術(shù)經(jīng)濟(jì)指標(biāo)和完成時(shí)間，并確定好正確合理的設(shè)計(jì)方案是完成設(shè)計(jì)任務(wù)的保證，指導(dǎo)教師、和同學(xué)一起參與設(shè)計(jì)方案的討論，使我對(duì)設(shè)計(jì)方案心中有數(shù)。這個(gè)課題能較全面地應(yīng)用學(xué)生所學(xué)專(zhuān)業(yè)知識(shí)或者將來(lái)工作所需的專(zhuān)業(yè)技術(shù)，達(dá)到綜合運(yùn)用的目的，既能夠解決企業(yè)急需解決的生產(chǎn)技術(shù)問(wèn)題，又能夠培養(yǎng)學(xué)生的職業(yè)崗位能力，難度不是很大，符合我們高職專(zhuān)科生的專(zhuān)業(yè)理論知識(shí)水平和實(shí)際設(shè)計(jì)能力，工作量恰當(dāng)，能夠在規(guī)定時(shí)間內(nèi)完成。 第一，確定畢業(yè)設(shè)計(jì)課題。但是，高職學(xué)生的畢業(yè)設(shè)計(jì)不能完全等同于本科生，應(yīng)密切與生產(chǎn)實(shí)際相結(jié)合，應(yīng)與培養(yǎng)職業(yè)能力相結(jié)合，應(yīng)體現(xiàn)職高的特點(diǎn)。本工序?yàn)殂@鉸加工，由于夾緊方向?yàn)榇怪毕蛏?，要克服零件和移?dòng)軸所受重力，可以在適當(dāng)?shù)奶岣邏嚎s空氣的工作壓力（由 增至 ） ,以增加氣缸推力。而且考慮到環(huán)保，所以選用氣動(dòng)源夾緊。由于工件所需的夾緊力并不大，所以直接夾緊未采用其他的機(jī)構(gòu)。螺釘能防止鉆套加工時(shí)轉(zhuǎn)動(dòng)及退刀時(shí)脫出。查機(jī)械手冊(cè)，鉆套與襯套之間采用67mF配合，襯套與鉆模之間采用6n7H配合。焊接件制造方便，生產(chǎn)周期短，成本低。在四角有 U型槽，與 T 型螺釘配合使用 ，將夾具固定在工作臺(tái)上。 因此 N氣 已大于所需的 2387N 的夾緊力，故本夾具可安全工作。 （ 3）工件的孔尺寸要求不高，同軸度的誤差主要有鉆套和襯套的不同同軸度引起的 ,襯套的同軸度小于 ，鉆套的同軸度小于 而零件要求的最大同軸度為 定位尺寸 公差的確定。 ： （ 1）定位元件尺寸及公差的確定：夾具的主要定位元件為一平面一 短銷(xiāo)，該定位短銷(xiāo)的尺寸與公差規(guī)定和本零件在工作時(shí)的尺寸與公差配合，即 ? ?? 。本夾具將用于 Z5125 立鉆床，刀具為φ 麻花鉆和φ 9絞刀。 為了提高勞動(dòng)生產(chǎn)，保證加工質(zhì)量，降低勞動(dòng)強(qiáng)度，需要設(shè)計(jì)專(zhuān)用夾具。 鍍鉻包括除油，脫脂，電鍍。 1選擇砂輪： 中南林業(yè)科技大學(xué)模具設(shè)計(jì)與制造 12 GB46ZR1A6P