【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。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. 撰寫設(shè)計(jì)說(shuō)明書。由于我的知識(shí)能力水品有限，這個(gè)設(shè)計(jì)還不是很完善。故實(shí)際切削速度為 Vc=攻螺紋機(jī)動(dòng)實(shí)際的計(jì)算 =工序六：磨削(1)選擇砂輪。則主軸轉(zhuǎn)速為。11（參照工序一自行擬定，在此省略，詳情見工序卡）工序四：鉆擴(kuò)粗鉸精鉸248。當(dāng)使用YT15，（，XA5032型立式銑床說(shuō)明書）時(shí)，fz=—但因?yàn)椴捎脤?duì)稱端銑，故取 fz= 4）選擇銑刀磨鈍標(biāo)準(zhǔn)以及刀具壽命，：由于銑刀直徑d。 6）計(jì)算基本工時(shí) 因?yàn)椴捎脤?duì)稱安裝銑刀，如切量及超切量y+Δ=20mm，則：L=l+y+Δ=124mm。=100mm。γ。根據(jù)上述原始資料及加工工藝，分別確定各加工表面的機(jī)械加工余量、工序尺寸以及毛坯尺寸如下： 底面和兩側(cè)面查《機(jī)械加工工藝手冊(cè)》（以下簡(jiǎn)稱《工藝手冊(cè)》），取底面加工余量為4mm，側(cè)面單邊為2mm。因此，具體工藝過(guò)程確定如下：工序1：以側(cè)面作定位基準(zhǔn)，銑底面。對(duì)于提高生產(chǎn)率和保證加工質(zhì)量也是有利的。刀架的結(jié)構(gòu)形式一般為回轉(zhuǎn)式，刀具沿圓周方向安裝在刀架上，可以安裝徑向車刀、軸向車刀、鉆頭、鏜刀。 本次機(jī)械制造工藝學(xué)課程設(shè)計(jì)不僅僅能幫助我們利用已學(xué)的知識(shí)進(jìn)行設(shè)計(jì)，還培養(yǎng)了我們自己分析，獨(dú)立思考的能力。16，深10，加工孔4216。 就我個(gè)人而言，我希望通過(guò)這次課程設(shè)計(jì)對(duì)自己未來(lái)將從事的工作進(jìn)行一次適應(yīng)性訓(xùn)練，從中鍛煉自己發(fā)現(xiàn)問(wèn)題，分析問(wèn)題和解決問(wèn)題的能力，為今后參加工作打下良好的基礎(chǔ)。 4xФ11 、4xФ12xФ6以及螺紋M8。（三）制定工藝路線制定工藝路線的出發(fā)點(diǎn)，應(yīng)當(dāng)是零件的集合形狀，尺寸精度一級(jí)位置精度等技術(shù)要求能得到合理的保證，在已確定為大批量生產(chǎn)的條件下，可以采用萬(wàn)能機(jī)床配以專用工裝夾具，并盡量使工序集中來(lái)提高生產(chǎn)率，除此之外，還應(yīng)考慮經(jīng)濟(jì)效果，以便降低生產(chǎn)成本。32H7，工序5：以底面作定位基準(zhǔn)，鉆M8螺紋底孔并攻M8螺紋孔工序6：以側(cè)面作定位基準(zhǔn)，磨底面工序7：以側(cè)面作定位基準(zhǔn)，刮研底面，工序9：配鉆2216。加工要求：粗、精銑底面。銑削深度ap≤4mm時(shí)，端銑刀直徑d。=100mm，z=5，ap≤4mm，fz≤，vt=120m/min，nt=300r/min，vft=250mm/min。=100mm。 6）計(jì)算基本工時(shí) 因?yàn)椴捎脤?duì)稱安裝銑刀，如切量及超切量y+Δ=20mm，則：L=l+y+Δ=124mm。故由Z525型立式鉆床說(shuō)明書取f=。故(2)攻M8的螺紋 由《機(jī)械加工工藝手冊(cè)》，在Z525型立式鉆床上攻絲。 在整個(gè)設(shè)計(jì)過(guò)程中我懂得了許多東西，也培養(yǎng)了我獨(dú)立工作的能力和團(tuán)隊(duì)協(xié)作能力，樹立了對(duì)自己工作能力的信心，相信會(huì)對(duì)今后的學(xué)習(xí)工作生活有非常重要的影響。Nestled close to the country39。s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a year on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughters39。is going on in Beijing, the exhibit aims to show the world this brilliant section of history. The Silk Road is a series of trade and cultural transmission routes that were central to cultural interaction through regions of the Asian continent. It connected the West and East by linking traders, merchants, pilgrims, monks, soldiers, nomads, and urban dwellers from China and India to the Mediterranean Sea during various periods of time. I met my dear hubby in 2009 the second year I was in my school and it was the first year when he came here. We became colleagues. And there was nothing special happening during that year. He was just a kind and humble brother graduated from the same college as me. But we did not know each other till he became my colleague and his office desk was just in front of me. There was only a glass between us. So actually we could see each other when we both look up. But it is not the main reason that really draws us close. How we bee close to each other was something seems quite natural. We went out to play badminton with other colleagues and we sometimes chatted for a while. He is a man of few words but somehow sometimes will say something really humorous. Then one day, to my great surprise, I found a pot of beautiful flower on my desk. It was just th