freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

畢業(yè)論文-金屬金相試樣切割機設(shè)計-文庫吧資料

2025-01-18 19:18本頁面
  

【正文】 purchasing. In a word, the overall market trend is very unpredictable. Although China Guardian 2022 Spring Auctions has achieved remarkable results, it does not mean that the market has walked out of the predicament. We still have to wait for the big economic boom to invigorate the art market.‖ Even so, the hot pursuit of some special items appeared this spring. A special session of China Guardian Spring Auctions titled ―Fine Gilt—Bronze Buddhist Images‖ achieved a great deal with total sales volume of million yuan and 92 percent sale rate. The 5th Shamar Rinpoche Statue from 1617th century of Tibet was sold for million yuan. The Beijing Chengxuan Auctions featured almost 2,800 items of coins and stamps in three sessions with good sale rate. The Huachen Auctions also set a special session of photographs under the condition of largescale decline of auction sessions. There was a palpable dull thud of disappointment that acpanied the return of the imperial entourage of Zhen Huan to her homeland. It followed a couple years of hushed excitement as Chinese fans were fed tidbits about their proud concubine who was supposed to conquer the high ground of the North American market. Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2022 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modification. Now, a condensed version that provides English subtitles but no dubbing has finally been made available on Netflix for online streaming. This version, highly anticipated as a milestone in China39。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。s performers of the troupe still tour the region39。t have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in. For him, the rewarding part about touring isn39。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。非常感謝在本次設(shè)計中曾給予我耐心指導(dǎo)和親切關(guān)懷的老師及幫助過我的同學(xué),正是由于他們的幫助和鼓勵才使我能夠在畢業(yè)設(shè)計過程中克服種種困難,最終順利完成論文,他們的學(xué)識和為人也深深地影響著我。 致謝 非常感謝學(xué)院領(lǐng)導(dǎo)和老師給我提供了這次良好的深入學(xué)習(xí)的機會和寬松的學(xué)習(xí)環(huán)境。 綜上所述,再查閱有關(guān)資料,得出方案一優(yōu)于方案二,故選擇方案二,那么安裝電動機的幾座要高于水平機座 21mm,且凸出部分厚度為 5mm,其余部分厚度為 10mm。它的優(yōu)點是:實際有效切割距離要比方案一大很多。這種方案的缺點就是有效切割距離比較小。 暫將前一種方法定位方案一,后一種定為方案二,現(xiàn)在愛分析兩種方案的優(yōu)缺點 : 方案一,利用刀片的右邊緣來切割金屬試樣。 第七章 機座的設(shè)計 首先,根據(jù)導(dǎo)軌進給系統(tǒng)與電動機的大小,以及二者的位置分析,將機座設(shè)定為330*255mm。 m 鍵的高度 h=5mm 鍵與輪轂鍵槽的接觸高度 k== 鍵的工作長度 l=Lb=19mm 軸的直徑 d=20mm 鍵、軸、輪轂中最弱材料的許用擠壓應(yīng)力 [σ p]=100MPa 則σ p= 3 ?? MPa< [σ p]=100MPa 齊魯工業(yè)大學(xué) 2022 屆本科生畢業(yè)設(shè)計(論文) 14 故安全,鍵強度合格。因此通常只按工作面上的擠壓應(yīng)力進行強度校核計算。 具體如下: 圖 6 上滑板 圖 7 中滑板 圖 8 下滑板 齊魯工業(yè)大學(xué) 2022 屆本科生畢業(yè)設(shè)計(論文) 13 圖 9 進給裝置 第六章 鍵的選擇與校核 鍵的選擇 根據(jù)鍵連接軸段的直徑與軸上零件齒輪的輪轂長度,現(xiàn)選擇 A型(圓頭)普通平鍵連接,具體尺寸如下: 1. 導(dǎo)軌進給系統(tǒng)中絲 桿與手輪之間的鍵連接: B*L*H: 2*7*3 2. 夾具中絲桿與手輪之間的鍵連接: B*L*H: 2*7*3 3. 電動機與軸之間的鍵連接: 4. B*L*H: 4*23*5 鍵的校核 在本設(shè)計中,平鍵連接只用于傳遞轉(zhuǎn)矩,對于采用常見的材料組合和按標(biāo)準選取尺寸的普通平鍵連接,其主要失效形式是工作面被壓潰。本切割機采用燕尾槽型導(dǎo)軌,需要在 水平方向上調(diào)整間隙。間隙過小,會增加摩擦阻力;間隙過大,會降低導(dǎo)向精度。具體位置尺寸見圖 圖 5。導(dǎo)塊與螺桿裝配一起,在螺桿旋轉(zhuǎn)時導(dǎo)塊分別引領(lǐng)和帶動上滑板或中滑板進行橫向或縱向移動。根據(jù)情況選擇螺桿直徑為 12mm, 螺距為 5mm,當(dāng)手輪旋轉(zhuǎn)一周時螺桿前進了 5mm。導(dǎo)軌的行程為 80mm,則滑板尺寸的長、寬為 100mm,而高度隨情況而定,具體數(shù)值見圖 圖 圖 6。螺桿一端分別安裝有手輪,手輪上刻有刻度,以滿足不同的切割要求。 38 則夾緊力 W≈ 1974(N) 。 28′ 。 α — 壓桿螺紋升角 。 r2 — 壓桿螺紋中徑的一半 , r2 = (注 :壓桿螺紋為 10mm) 。 L — 手輪半徑 L = 10mm。通過計算可知 ,若要實現(xiàn)壓桿前進 50mm ,手輪需旋轉(zhuǎn) 10圈。由此可見這種夾具是依靠非常簡單的螺旋運動前進或后退 ,來實現(xiàn)對工件的夾緊或松開。螺母規(guī)格: D=M10( GB/T 6174) 軸的結(jié)構(gòu) 設(shè)計 圖 2 軸 第五章 控制系統(tǒng)的設(shè)計 夾具的主要結(jié)構(gòu)與使用 如圖所示 ,該夾具由手輪、絲桿、絲母、左夾具、右夾具組成。 砂輪的軸向固定輪安裝在軸上后,左端用軸肩來固定,右端使用螺母。 軸的內(nèi)部為了連接電動機的軸所以為空心,其空心長度為 23mm,直徑為 11mm。 為了軸承的安裝固定,在軸承的最左邊設(shè)置有軸肩,直徑為 32mm。 則 d= 為了滿足切割砂輪的軸向定位要求,Ⅰ Ⅱ軸段右端需制出一軸肩,而且為了避免電動機的軸向竄動,選擇推力球軸承加以軸向固定。 撓度計算公式如下: ymax=— FL3/3EI 式中: P— 切割時作用在軸上的力, P=; L— 軸的長度 , L=58mm; E— 彈性模量,查手冊: E=206GPa; I— 慣矩, I=πd 4/32。 軸的撓度計算 齊魯工業(yè)大學(xué) 2022 屆本科生畢業(yè)設(shè)計(論文) 9
點擊復(fù)制文檔內(nèi)容
環(huán)評公示相關(guān)推薦
文庫吧 www.dybbs8.com
備案圖鄂ICP備17016276號-1