【正文】 ................................................................................................ 21 共 5 頁 第 2 頁 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 空心坯減徑 ............................................................................................. 23 鋼管連軋 ................................................................................................. 23 再加熱 ..................................................................................................... 24 張力減徑 ................................................................................................. 26 冷床 ........................................................................................................ 28 鋸切 ........................................................................................................ 28 4 軋制表計算 ................................................................................................................. 28 軋制表計算的條件（基本參數(shù)和極限值） ..................................................... 28 軋件長度 ................................................................................................ 28 張減機減徑系列 ..................................................................................... 28 孔型系統(tǒng)的確定 ............................................................................................... 29 主孔型 —— 連軋管外徑的確定 .............................................................. 29 不同系列組合分工 ................................................................................. 30 圓孔與橢孔的選擇 ................................................................................. 30 孔型配置 ................................................................................................. 31 ....................................................................................................... 31 計算步驟 ................................................................................................. 31 管坯直徑 ........................................................................................................... 34 管坯質(zhì)量計算 ................................................................................................... 35 標(biāo)準(zhǔn)管坯重量 BG 能最大程度發(fā)揮機組生產(chǎn)能力 ................................. 35 最小坯料重量 ......................................................................................... 35 金屬平衡表計算 ............................................................................................... 36 計算熱區(qū)有效收得率 EWA.................................................................... 36 計算實際長度 ......................................................................................... 37 金屬平衡表 ............................................................................................. 37 穿孔頂頭直徑及頂桿直徑 ................................................................................ 37 頂頭直徑 ................................................................................................. 37 ganD 的選擇 .............................................................................................. 38 穿孔調(diào)整參數(shù) ......................................................................................... 38 輥距 Bck [11] .............................................................................................. 38 共 5 頁 第 3 頁 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 頂頭前伸量 b .......................................................................................... 38 頂桿位置： ............................................................................................. 38 導(dǎo)盤輥距 ckL ........................................................................................... 39 5 孔型與工具設(shè)計 ......................................................................................................... 40 穿孔工具設(shè)計 ................................................................................................... 40 穿孔軋輥設(shè)計 ......................................................................................... 40 材質(zhì)及技術(shù)要求（輥套） ................................................................................ 41 導(dǎo)盤設(shè)計 ................................................................................................. 41 頂頭設(shè)計 ........................................................................................................... 43 頂頭形狀類型 ......................................................................................... 43 各段尺寸 ................................................................................................. 44 頂頭材質(zhì)及技術(shù)要求 .............................................................................. 44 孔型設(shè)計的基本參數(shù)及變形量表示法 ............................................................. 44 簡述 ........................................................................................................ 44 變形分配 ................................................................................................. 45 確定孔型結(jié)構(gòu)參數(shù) ................................................................................. 50 軋輥轉(zhuǎn)速計算 ................................................................................................... 53 軋輥轉(zhuǎn)速的限制 條件 .............................................................................. 53 計算步驟 ................................................................................................. 53 張減機孔型的重要參數(shù) .................................................................................... 56 6 軋機生產(chǎn)能力計算 ..................................................................................................... 58