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肋的合理布置

2014-08-19 11:18 作者:管理員14 來源:未知 瀏覽: 字號:

摘要:1)肋的合理布里的一般原則見表18.1-15, 2)梁式機架箱形結構的布肋表18.1-16,表18.1-17分別列舉了布肋對開式和閉式梁式機架箱形結構剛度的影響。表中相對剛度均以無肋箱體No. I作為比較基準。從表中可以看出;.①縱向肋能有效地提高開式箱形結構的抗彎剛度;②4

      1)肋的合理布里的一般原則見表18.1-15,
      肋的布置應有效地提高機架的強度和剛度1肋的布置應有效地提高機架的強度和剛度2
      布肋應考慮彈性匹配
        2)梁式機架箱形結構的布肋表18.1-16,表18.1-17分別列舉了布肋對開式和閉式梁式機架箱形結構剛度的影響。表中相對剛度均以無肋箱體No. I作為比較基準。從表中可以看出;.①縱向肋能有效地提高開式箱形結構的抗彎剛度;②45。對角肋對扭轉剛度的提高有明顯的效果;③不論哪一種布肋形式.當開式改為閉式時,杭夸剛度平均可提高60%,扭轉剛度可提高4.5-8.5倍。實例見表18.1-18.
      布肋對開式箱型結構剛度的影響
      開式床身的布肋
         將機床床身的肋板布里歸納為5類20種形式,作用在床身上的載荷分為6種類型(見圖18.1-2).而后把各種載荷條件下產生的應變能總和作為柔度特性值(柔度是指構件在外加載荷作用下傾向于產生變形的能力):把所耗材料的體積和柔度特性值.表示材料使用的經濟性;娜縫長度和柔度的乘積,表示焊接費用的技術效益。最經濟的結構形式是上述兩項乘積小的結構。表18.1-19列舉了20種型式布肋的柔度、材料體積和焊縫長度的比值,表18.1-20列舉了各種布肋的經濟性。從表中可知.最經濟的結構形式是序號0(無肋閉式).其次是序號18和序號12,但它們只有在肋板或箱體璧板直接支承導軌時才能應用。從經濟性看,序號9和序號10的縱向肋較差。
     具有不同布肋的閉式床身(模型)柔度、材料體積和焊縫長度比值   閉式床身(模型)內布肋的經濟性比較 
       2
      3)柱式機架肋的布!對空心立柱抗夸及杭扭剛度的影響見表18.1-21(參照圖18.1-3),
      床身載荷
      布肋對空心立柱抗彎及抗扭剛度的影響
      布肋對空心立柱抗彎及抗扭剛度的影響1
      
      4)平板式機架肋板布工對開式(無底板)與閉式底座剛度的影響見表18.1-22。從表中可以看出:對角線肋和交叉肋(模型序號,一11)對提高開式底座的杭扭剛度作用顯著。在相同條件下閉式底座比開式底座抗彎、擾扭剛度都高,如表中棋型ls與,相比扭轉剛度要高十幾倍。 實例見表18.1-23,
      布肋對底座剛度的影響平板類機架布肋舉例
      5)壁板上布肋可以減少局部變形和薄壁振動,以及提高機架剛度。壁板上常見的布肋形式見表18.1-24.實例見表18.1-25.
      柴油機、空氣壓縮機、破碎機和金屬切削機床壁上肋的布置
      
 
      

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