【正文】 . A lt ho ug h I le arne d the piano s ince childhoo d and gre w up lis te ning to vario us kinds of mus ic, to me , the folk mus ic of Inne r Mongolia is the root, he s ays . Pe rfo r ming in re mote village s is ple as ant . I fe e l at home on the b oundle s s gras s lands , and the warm pe ople the re make me fe e l fulfille d. The firs t round of s pring auct io n s e as on in B e ijing e nde d las t we e k, but it faile d to cre ate much s pring in the art marke t . Altho ug h two pie ce s of Chine s e paint ing fe tche d more than 100 millio n yuan, the de cline in trading volume and sale rate showe d a downturn this ye ar. In the ―Grand View: Chinese Painting Highlight‖ session at China Guardian 2021 spring auctions, Pan Tianshou’s representative work Eagle, Rock and Flora hit a re cord auctio n price of 279 million yuan, while Li Keran’s masterwork Jinggang Mountain fetched 126 . 5 millio n yu an, a n une x pe c te d hig h in re ce nt ye ars . H o we ve r, t he t ra ding v o lume fe lls to billio n yuan fro m billio n yuan in the s ame pe rio d the ye ar be fore . The Huang c he n 2021 Spring Auctio ns , whic h re corde d millio n yuan in total s ale s , e xpe rie nce d the s ame . The s e ction numbe r we nt down to 5 fro m 12 pare d to las t ye ar. Accordi ng to e xpe rt Shao Jianwu , the art marke t did not attrac t much exc ite me nt t his ye ar due to t he boo ming s to ck ma rke t and the pe rs is te nt proble ms of fe ry and fake de als . The two pie ce s of Chine s e paint ing notche d up high price this s pring due to the ir own value not due to a re v iv al in t he marke t . T he s ucce s s ful t rans ac t io n o f t wo wo rks wit h a h am me r price 河南科技大學(xué)畢業(yè)設(shè)計(jì) (論文 ) 28 of more than 100 millio n yuan once again confir ms that valuab le and rare works of high qualit y always e arn the long las t ing high price . Chine s e paint i ng and callig r ap hy is s till the pilla r of the marke t . Howe ve r, the ove rall s ale s rate has droppe d s light ly, whic h re fle cts the de mand for the ordinar y auct io n goods has weakened,‖ said the preside nt of China Guardian’s Hu Yanyan. Besides, the entry o f ne w bu ye rs als o make s ce rt ain c ha nge s t o t he dire c t io n o f pu rc has ing . I n a wo rd, the ove rall marke t tre nd is ve ry unpre dic t ab le . Altho ug h China Guardia n 2021 Spring Auctio ns has achie ve d re mark a ble re s ults , it doe s not me an that the marke t has walke d out of the pre dic ame nt. We s till have to wait for the big e conomic boom to invigorate the art marke t.‖ Even so, the hot pursuit of some special items appe are d this s pring . A s pe cial s e s s ion of China Guard ian Spring Auctio ns title d ―Fine Gilt—Bronze Buddhist Images‖ achieved a great deal with total sales volume of millio n yuan and 92 pe rce nt s ale rate . The 5th Shama r Rinpo c he Stat ue from 1617th ce ntury of Tibe t was s old for millio n yuan. The B e ijing Che ngxua n Auctio ns fe at ure d almos t 2,800 ite ms of coins and s tamps in thre e s e s s ions with good s ale rate . The Huache n Auc tio ns als o s e t a s pe cial s e s s ion of photog r ap hs unde r the condit io n of large s c ale de cline of auct io n s e s s ions . The re was a palpa ble dull thud of dis appo in t me nt that acpa nie d the re turn of the impe ria l e ntourage of Zhe n Huan to he r home land . It follo we d a couple ye ars of hus he d e x c ite me nt as C hine s e f ans we re fe d t idbit s abo ut t he ir pro ud c o nc ubine w ho was s uppos e d t o co nque r t he hig h g ro und o f t he N o rt h A me ric an ma rke t. Zhe n H uan is , of cours e , the title charac te r of The Le ge nd of Zhe n Huan, a 2021 te le vis io n s e rie s that s we pt China off its fe e t and late r took othe r As ian count r ie s by s torm. Two ye ars ago , it was re po rt e d t hat HB O, a pre mium c able s e rv ice he adqu art e re d in t he U nite d St at e s , was g o ing to air it in N o rt h A me ric a a fte r s o me mo di fic at io n. N o w, a co nde ns e d ve rs io n t hat p ro v ide s E ng lis h s ubt it le s but no dubbing has fin all y be e n made av aila ble o n Ne t flix fo r o nline s t re aming . T his ve rs io n, hig hly ant ic ipat e d as a mile s to ne in China39。s pe rfo r me rs of the troupe s till tour the re gion39。 同時(shí)，由于水平有限，設(shè)計(jì)過程中有很 多錯(cuò)誤，謝謝批評指正 ，我將不斷修改。卸料用彈性卸料版，同時(shí)用活動擋料銷對板料定位，沖孔后的板料用頂件塊頂出。落料沖孔中要考慮排樣問 題，讓板料的使用率達(dá)到最大，節(jié)約材料，創(chuàng)造更大的財(cái)富。然后就要把它的三維圖畫出來，但當(dāng)時(shí)自己三維并沒有接觸鈑金件的畫圖訓(xùn)練，就去圖書館借書，自學(xué)軟件自帶教程，終于幾天后我畫出了漂亮標(biāo)準(zhǔn)的三維圖。 167。容易使板料容易產(chǎn)生擦傷或壓痕，大大增加彎曲力甚至減少模具使用壽命。凸模的圓角半徑選用彎曲件的內(nèi)彎半徑 r，即 rrp? 。凸凹模上的頂出銷起固定壓緊板料的作用，然后凸凹模帶著板料下行，與凸模配合，進(jìn)行中間板料的彎曲成型。 河南科技大學(xué)畢業(yè)設(shè)計(jì) (論文 ) 19 第四章 彎曲模設(shè)計(jì) 彎曲是使材料產(chǎn)生塑性變形，形成一定曲率和角度零件的沖壓工序。 導(dǎo)套規(guī)格直徑 40mm，公差帶 H6，長度 L 為 140mm， H=53mm 的 A 型導(dǎo)套。其材料都是用 45 鋼。泊松比： ~ 。它的化學(xué)~:C : ???? PSMnSi 。 結(jié)合零件尺寸，設(shè)計(jì)的凹模， 材料： T8A 如圖 23。這種方法不僅容易保證間隙值，而且制造加工也比較容易，廣泛運(yùn)用于目前工廠的實(shí)際制作。 凸模與凹模刃口尺寸的確定 模具的刃口尺寸和公差會對 制件 的精度產(chǎn)生影響， 設(shè)計(jì)中關(guān)鍵環(huán)節(jié) 是如何確定沖裁模具的凸、凹模的刃口尺寸和公差。 沖模封閉高度的確定 沖模的封閉高度是指模具在最低工作位置時(shí)，上模座頂面與下模座底面間的距離 H。（ 3）閉合高度。沖裁力計(jì)算： )( ?????? bLtF ?落 N432513? ?????? ?? bLtF 孔 ? 0 9 4 6 04 3 2 5 1 3 ???? 孔落沖 FFF = N541973 卸料力計(jì)算： 從凸模上將零件和廢料卸下來的力叫卸料力。 一般沖模壓力中心的確定有兩種方法（ 1）解析法、（ 2）作圖法。. 3 排樣搭邊方案確定 沖裁件在條料上的布置叫排樣。 工藝方案的擬定 167。由板料沖孔、落料、彎曲等幾道工序 制作而成，工件外形對稱，且結(jié)構(gòu)較復(fù)雜，尺寸屬中小范圍，有少量尖角，無其他形狀突變，系典型的板料沖壓件。學(xué)會在工作中嚴(yán)肅，慎重的對待自己的設(shè)計(jì)，不能隨便定數(shù)據(jù)，讓每個(gè)數(shù)據(jù)都 來之有理，并合理。 本次設(shè)計(jì)的目的是： 1．培養(yǎng)查閱文獻(xiàn)的能力，此次設(shè)計(jì)很長時(shí)間讓給學(xué)生來查找本專業(yè)文獻(xiàn)，通過對零件結(jié)構(gòu)，材料，和加工精度的要求分析，來查閱相關(guān)資料，弄清每一步的設(shè)計(jì)原理，規(guī)則和注意事項(xiàng)。 壓力機(jī)的選擇 ..................................................