【正文】 .....................................................................................3 型材棒料剪切機(jī) ................................................................................................3 剪切生產(chǎn)中存在的問題 ...........................................................................................42 傳動(dòng)方案的選擇 ..........................................................................................6 皮帶傳動(dòng)的選擇 ...............................................................................................................6 減速器傳動(dòng)選擇 ...............................................................................................................6 齒輪轉(zhuǎn)動(dòng)選擇 ...................................................................................................................7 ...................................................................................8 設(shè)計(jì)的基本要求 ...............................................................................................................8 剪切機(jī)構(gòu) ...........................................................................................................................8 主要參數(shù)的確定 ...............................................................................................................9 刀片的行程.................................................................................................................9 刀片尺寸.................................................................................................................10 理論空行程次數(shù).....................................................................................................10 剪切力的計(jì)算 .................................................................................................................10 單位剪切阻力曲線.................................................................................................10 最大剪切力.............................................................................................................11 電機(jī)容量的選擇 .............................................................................................................13 = f(α)曲線繪制 ......................................................................................................13=f(α)曲線的繪制 .....................................................................................................13 偏心軸上的靜力矩計(jì)算...........................................................................................13遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) （論文） 第 V 頁4 主要零件的強(qiáng)度計(jì)算 ......................................................................................19 曲軸的設(shè)計(jì) .....................................................................................................................19 曲軸的計(jì)算 .....................................................................................................................20 齒輪的計(jì)算與校核 .........................................................................................................21 選定齒輪類型，精度等級(jí)，材料及齒數(shù)...............................................................21 設(shè)計(jì)計(jì)算齒面接觸接觸強(qiáng)度 ......................................................................................22........................................................................................................22.................................................................................................................22 按彎曲疲勞強(qiáng)度進(jìn)行較核設(shè)計(jì)...............................................................................23 皮帶輪的計(jì)算 .................................................................................................................25 確定計(jì)算功率.........................................................................................................25 選擇帶型.................................................................................................................25 參數(shù)的計(jì)算.............................................................................................................25 確定中心距 a 和帶的基準(zhǔn)長(zhǎng)度 Ld .......................................................................25 驗(yàn)算主動(dòng)輪上的包角 α........................................................................................26 確定帶的根數(shù).........................................................................................................26 軸承的計(jì)算 .....................................................................................................................26 初選軸承.................................................................................................................26 驗(yàn)算軸承的平均壓力 P..........................................................................................27 驗(yàn)算軸承的 PV........................................................................................................27 驗(yàn)算滑動(dòng)速度.........................................................................................................27 大帶輪上鍵的計(jì)算 .........................................................................................................27 初選鍵及參數(shù)...........................................................................................................27 校核鍵的強(qiáng)度.........................................................................................................27 ..............................................................................................29 潤滑 .................................................................................................................................29 軸承.........................................................................................................................29 開式齒輪.................................................................................................................29遼寧科技大學(xué)本科生畢業(yè)設(shè)計(jì) （論文） 第 VI 頁 離合機(jī)構(gòu)— 滑塊.....................................................................................................29 減速機(jī).....................................................................................................................29 牙嵌