【正文】
ality of its structure and performance of a direct impact on manufacturing cost CNC lathe。橫向進給機構(gòu)可以實現(xiàn)手動、斷續(xù),連續(xù)三種工作方式,并且還設(shè)置了微量進給裝置,通過手柄控制蝸輪蝸桿,手柄每轉(zhuǎn)一轉(zhuǎn)滾珠絲杠移動 ,滿足機床適應(yīng)更大的加工范圍 。 本文介紹了 M250 手動平面磨床工作臺縱橫向進給機構(gòu)改進設(shè)計,手動平 面磨床一般都采用滑動絲杠,為了更好的提高平面磨床的加工精度,在對 M250 手動平面磨床的進給機構(gòu)進行改進時采用了滾珠絲杠,并且可以實現(xiàn)手動進給與機動進給兩種控制方式。其結(jié)構(gòu)的合理性和性能的好壞直接影響著數(shù)控車床的制造成本;影響著車床各部件之間的相對位置精度和在工作中各運動部件的相對運動軌跡的準確性。 隨著現(xiàn)代科技的發(fā)展 , 機械制造業(yè)面臨著高速度、高精度等新的挑戰(zhàn) , 高速進給系統(tǒng)成為高速高精度數(shù)控車床的關(guān)鍵環(huán)節(jié)之一。目前,我們對軸承加工設(shè)備,尤其是高精度、高效率、高可靠性的軸承磨床需求量十分龐大。隨著高速磨削和強力磨削工藝的發(fā)展,進一步提高了磨削的效率。 畢業(yè)設(shè)計論文 姓 名: 王 沖 學(xué) 號: 0802090534 學(xué) 院: 機械工程學(xué)院 專 業(yè): 機械設(shè)計制造及其自動化 題 目: M250 手動平面磨床工作臺縱橫向進給機 構(gòu)改進設(shè)計 指導(dǎo)教師: 孫麗英 講 師 2021 年 6 月摘 要 I 摘 要 手動平面磨床是傳統(tǒng)的機床產(chǎn)品,適合于中小型磨具、電子元件及各種小型工件的磨削加 工。尤其適合于小工廠、家庭作坊,具有較大的市場容量。因此,磨床的使用范圍日益擴大,在金屬切削機 床 中 占 的 比 重 不 斷 上 升 , 在 工 業(yè) 發(fā) 達 國 家 占 金 屬 切 削 機 床 的13%~27%。軸承,作為機械工業(yè)的基礎(chǔ)件,其加工設(shè)備的重要性非常突出。床身,作為主要支承件的床身至關(guān)重要, 其結(jié)構(gòu)性能的好壞直接影響著機床的各項性能指標。 由于進給系統(tǒng)剛度低、慣量大 , 難以獲得高進給速度和高加速度 ,為了提高高速高精度數(shù)控車床的定位精度和傳動精度 , 除了正確設(shè)計、選擇進給系統(tǒng)部件 , 精確計算其強度、穩(wěn)定性和驅(qū)動力矩外 , 還要對進給系統(tǒng)的剛度進行 合理 設(shè)計 , 減 少因 剛度 引起 的失 動量 , 以 確保 加工 定位精度??v向進給實現(xiàn)連續(xù)的往復(fù)運動。 關(guān)鍵詞:手動平面磨床;橫向進給;縱向進給;微量進給;滾珠絲杠 Abstract II Title:The improvement design of M250 manual surface grinding machine work table horizontal feed system and vertical feed system Abstract Manual surface grinder is a traditional machine tool product . It is suitable grinding for small and mediumsized abrasive, electronic ponents and various s mall parts, particularly suitable for small factories, family workshops. The manual surface grinder has a large application field. Along w ith our country machine equipments, car industry etc. profession of fast development, also along with our country auto ma tion technique of exaltation, automation factory also top a new of step, the PLC be one new ly arisen of industry controller, with its physical volume small, the function be w ell found, the price be cheap, credibility Gao Deng3, have a special advantage, at the everyone noodles realm acquire extensive of the meantime, w e process an equipments to the bearings, particularly is a Gao accuracy, highefficiency, the Gao credibility of the bearings grinding machine39。 influence lathe parts and precision of the relative position between the w ork of all moving parts in relative motion trajectory accuracy. Stiffness of the feed system is low, large inertia, it is difficult to o btain high feed speed and high acceleration, high speed precision CNC lathe to improve positioning accuracy and driving accuracy, in addition to the design, select the feed system ponents, accurate calculation of its strength, stability And driving torq ue, but also the stiffness of the feed syste m Abstract III reasonably designed to reduce the loss of mome ntum caused by stiffness in order to ensure processing accuracy. This text introduction the improve ment design of M250 manual surface grinding machine w ork table horizontal feed system and vertical feed system The manual surface grinder generally adopts the screw. In order to improve machining accuracy of surface , my task is improving the feed system of M250 manual surface grinder, using the ball screw. And the grinder can finish manual feed and auto matic feed. Horizontal feed syste m can achieve continuous alternate motion. Vertical feed system can achieve manual, inter mittent and consecutive three methods of motion. And a micro feed system also is designed. The micro feed system can w ork through arc— contact w orm by the lever control . The every switch of the lever can control the ball screw to move mm. The machine can meet the greater range of processing. Key words:ma nual surface grinde r。ve rtical feed system。 ball screw 目 錄 IV 目 錄 摘 要 ...................................................... I Abstract ................................................... II 第 1 章 緒論 ................................................. 1 磨床概述 ............................................ 1 磨床定義及其分類 .............................. 1 磨床的主要發(fā)展趨勢 ............................ 2 平面磨床分類及其特點 ............................... 2 平面磨床分類及其特點 .......................... 2 手動平面磨床的國內(nèi)外發(fā)展狀況 .................. 3 本次設(shè)計的主要內(nèi)容 .................................. 6 本章小結(jié) ............................................ 7 第 2 章 手動平面磨床的總體設(shè)計 .............................. 8 設(shè)計方案 ............................................ 8 設(shè)計方案一 ..................................... 8 設(shè)計方案二 ..................................... 8 設(shè)計方案對比 ................................... 9 設(shè)計改進 ....................................... 9 進給系統(tǒng)的組成 ..................................... 10 機動進給裝置 .................................. 10 手動進給裝置 .................................. 10 本章小結(jié) ........................................... 11 第 3 章 進給機構(gòu)設(shè)計計算 ................................... 12 縱向進給機構(gòu)的設(shè)計計算 ............................ 12 切削力的計算 .................................. 12 滾珠絲杠的設(shè)計與計算 ......................... 14 軸承的選擇 .................................... 18 電動機的選擇 .................................. 19 減速機構(gòu)的設(shè)計與計算 ......................... 20 手動傳動裝置的設(shè)計與計算 ..................... 24 橫向進給機構(gòu)的設(shè)計計算 ............................ 26 切削力的計算 .................................. 26 目 錄 V 滾珠絲杠的計算 ............................... 27 軸承的選擇 .................................... 28 電動機的選擇 .................................. 29 減速機構(gòu)的設(shè)計與計算 ......................... 30 手動進給裝置的設(shè)計與計算 ..................... 33 本章小結(jié) ........................................... 36 第 4 章 其他零部件的選取 ................................... 37 導(dǎo)軌的選取 ......................................... 37 離合器的選取 ......