【正文】
速箱中的齒輪采用 1~2個模數(shù),選取模數(shù)依次為 2mm,3mm,3mm. 由公式? ?為模數(shù)mB mm ,10~6m ?? ??得: 第一變速組齒寬 BI=( 6~10)179。 2179。 222111 ???? ???? 載荷系數(shù) K約為 由《機械設(shè)計》表 105 查得齒形系數(shù) YFa1=,YFa2=。 300179。應(yīng)力校正系數(shù) YSa1=,YSa2=. ? ? ? ? 01 。 108 5) 由《機械設(shè)計》圖 1019 取 KHN1=, KHN2= 取失效概率的 1%,安全系數(shù) S=1 ? ? MP aSK HNH 5701lim11 ?? ?? 。 800179。見下表: 表 35 機床各中間傳動軸傳遞 功率及計算直徑 15 *=; *=; *=。 。 KL= 因此由下列公式計算 V 帶根數(shù) Z= 故 取兩根 ( 9)計算單根 V帶的初拉力的最小值( F0) min 由《機械設(shè)計》 表 83 得 A 型帶的單位長度質(zhì)量 q=,所以 ( F0) min= ???????????? )140224( d1d21 a)(? LLaa d0d0 ????rcaPP? ? NqvZvK PK ca 2 ????? 13 應(yīng)使帶的實際初拉力 F0( F0) min ( 10)計算壓軸力 Fp 壓軸力的最小值為 ( Fp) min=2Z( Fp) minsin =2179。 ( 4)確定帶輪的基準直徑 dd并驗算帶速 v 初選小帶輪的基準直徑 dd1,有《機械設(shè)計》表 86 和表 88,取小帶輪的基準直徑 ddi=95mm 驗算帶速 v。此時,各傳動副的齒輪齒數(shù)和相同。 9 ( 2)車床轉(zhuǎn)速圖與它的主傳動系統(tǒng)圖密切相關(guān)。 3, 2, 2 表示 按傳動順序的各傳動組的傳動副數(shù) 。故本設(shè)計采用結(jié)構(gòu)式為: 12=3*2*2 圖 21中,從軸 I 到軸 II有三 對 齒輪分別嚙合,可得到三種不同的傳動速度;從軸 II 到軸 III 有兩對齒輪分別嚙合,可得到兩種不同的傳動速度,故從軸 II 到軸 III 可得 到 3*2=6 種不同的傳動速度;同理,軸 III 到軸 IV 有兩對齒輪分別嚙合,可得到兩種不同的傳動速度,故從軸 I到軸 IV 共可得到 3*2*2=12種不同的傳動轉(zhuǎn)速。使用性能是保證零件工作安全可靠、經(jīng)久耐用的必要條件。車床噪聲主要是齒輪噪聲。它的左端通過掛輪架與床頭箱的軸相連,右端通過聯(lián)軸節(jié)與光桿和絲桿相連,操縱時只要搬動 床頭箱 外面的手柄到相應(yīng)位置,就可以把主軸的旋轉(zhuǎn)運動經(jīng)過掛輪架, 床頭箱 傳到絲桿或光桿。 關(guān)鍵詞 : 傳動效率 接觸疲勞強度 彎曲強度 耐磨性 2 Abstract CNC machine tools is the rapid development of the machine manufacturing industry, however, general machine tools because of its low cost, high quality, universal superiority in quite a long time can not be pletely replaced, but also with CNC machine tools neck and neck. The problem is how to explore the potential to improve performance, enhance its petitiveness. The design using value engineering principles to improve the design of the lathe headstock from the structure, materials and process. The socalled value engineering is to seek reasonable match between functionality and cost, so that enterprises can correctly handle the relationship between quality and cost in production and business activities, and to provide more affordable products to the munity, and bring to the enterprise and social more economic benefits. Determine the value of the object of the project generally affecting large parts, design era has long or plex structure need to improve or simplify the structure of the ponents we select products, bulky parts or materials, low utilization of design middle multi and improved potential for large parts. Therefore, based on the use of value engineering as a reasonable determination of the structure of the ordinary headstock design and select the appropriate ponents. Keywords: contact fatigue strength bending strength abrasion resistance transmission efficiency 3 目 錄 摘要 ................................................................................................................................. 1 Abstract.......................................................................................................................... 2 目 錄 ........................................................................................................................... 3 第一章 緒論 ............................................................................................................... 5 引言 ................................................................................................................... 5 國內(nèi)外研究現(xiàn)狀及發(fā)展趨勢 ................................................................................ 5 本課題主要研究內(nèi)容 .......................................................................................... 6 第二章 機械運動設(shè)計 ..................................................................................................... 7 ..................................................................................................... 7 ......................................................................................................... 7 .............................................................................................. 7 ........................................................................................... 8 ......................................................................................................... 8 動機 ......................................................................................................... 9 ................................................................................................... 10 第三章 傳動件設(shè)計 ...................................................................................................... 11 ................................................................................................ 11 ......................................................................................... 13 主軸的計算轉(zhuǎn)速 ....................................................................................... 13 中間傳動軸的計算 .................................................................................... 13 ......................................................................................... 15 ......................................................................................... 18 第四章 強