畢業(yè)論文-弧面凸輪分度機(jī)構(gòu)的運(yùn)動(dòng)特性分析說(shuō)明書(shū)(參考版)
2025-06-08 01:59本頁(yè)面
【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 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。 建立凸輪實(shí)體 根據(jù)表 2表 22 已知參數(shù)，建立凸輪實(shí)體，如下圖 31， 32 所示 圖 31 圖 32 19 建立 1L 段輪廓曲線 1）建立 1L第一段（ 0~1/8T）輪廓曲面 ①新建 .prt 文件打開(kāi) Pro/E Wildfire 三維繪圖軟件 ,新建 零件 實(shí)體，建立文件。因此我們采用第 一種方法來(lái)作凸輪工作面上的 3D曲線。這兩種方法都能作出凸輪工作廓面上的曲線。 ， …90176。 ， 4176。 第一，以θ為參數(shù)，將 r取一系列的值如 r=62， 67， 72，…， 92 等，這樣就可以作出一系列曲線，這些曲線相當(dāng)于用 一系列與凸輪同心直徑不同的圓柱面去截凸輪的工作廓面得到的一系列曲線； 第二，將 r當(dāng)作參數(shù)，θ取一系列值如 θ=0176。～ 360176。 18 3 弧面分度凸輪機(jī)構(gòu)的三維建模及裝配 弧面分度凸輪三維實(shí)體造型 弧面分度凸輪建模思想 根據(jù)弧面分度凸輪輪廓軌跡方程以及表 2表 24已知參數(shù)，分析可得 r和θ為是由一定制約關(guān)系的變量。 凸輪輪工作輪廓在坐標(biāo)系 1 1 1 1Oxyz 。 分度盤(pán)滾子圓柱面在動(dòng)坐標(biāo)系 2 2 2 2Oxyz 中的坐標(biāo)方程式為： 222cossinrrxryRzR?????????? （ ） 式中： r 、 ? 為滾子圓柱面的方程參數(shù)。圖中我們建立的四組直角坐 17 標(biāo)系如 下：與機(jī)架相連的定坐標(biāo)系 0 0 0 0Oxyz 。 弧面凸輪與分度盤(pán)滾子實(shí)際工作表面相接觸的曲面為工作廓面，在求解弧面凸輪工作廓面的方程式時(shí)，選擇合適的坐標(biāo)系，不僅可以簡(jiǎn)化計(jì)算過(guò)程，而且還影響公式的形式，在本文中，我們選用笛卡爾直角坐標(biāo)系。在推導(dǎo)弧面凸輪的曲面方程時(shí)，我們應(yīng)該首先設(shè)計(jì)滿(mǎn)足傳動(dòng)質(zhì)量要求的共軛曲面。 ) i? =S f? S為所選運(yùn)動(dòng)規(guī)律的無(wú)因次位移 / / 1200 1 / 8 ( 0 15 )45 1( si n 4 )441 / 8 7 / 8 (15 105 )45
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