【正文】 be assigned according to the shearing stiffness of the frames of the different axis. Then the internal force (bending moment, shearing force and axial force ) in the structure under the horizontal loads can be easily calculated. After the determination of the internal force under the dead and live loads, the bination of internal force can be made by using the Excel software, whose purpose is to find one or several sets of the most adverse internal force of the wall limbs and the coterminous girders, which will be the basis of protracting the reinforcing drawings of the ponents. The design of the stairs is also be approached by calculating the internal force and reinforcing such ponents as landing slab, step board and landing girder whose shop drawings are pleted in the end. br /[22] 西安建筑科技大學(xué)、東南大學(xué)、.第三版 [M] .北京：中國建筑工業(yè)出版社，1997br /[23] 東南大學(xué)編著、 [M] .北京：中國建筑工業(yè)出版社，1998P/Pp中小企業(yè)發(fā)展存在的問題及對(duì)策分析(字)br /摘amp。nbsp。 要：近年來湖南省中小企業(yè)發(fā)展迅速，對(duì)湖南經(jīng)濟(jì)快速發(fā)展起到了巨大的推動(dòng)作用，但在發(fā)展過程中面臨著融資困難，發(fā)展戰(zhàn)略不當(dāng)，品牌經(jīng)營模糊和技術(shù)創(chuàng)新難等一系列問題。本文分析問題形成的原因并提出解決這些問題的對(duì)策。br /關(guān)鍵詞：中小企業(yè)；品牌經(jīng)營amp。nbsp。 。發(fā)展戰(zhàn)略br /br /Hunan small and mediumsized enterprise development problems and countermeasure analysis br /Abstract: The development of small and mediumsized enterprises in China in recent years, the rapid economic development of rapid played a very important role. But in the process ofamp。nbsp。 operation facing financing difficulties, development strategy is undeserved, brandmanagement fuzzy and technological innovation difficult and so on a series of problems. The causes of the formation of problem analysis and put forward countermeasures to solve these problems.amp。nbsp。amp。nbsp。amp。nbsp。 br /Key words: Mediumsized and small enterprises Brand Operationsamp。nbsp。 Development strategybr /P/Pp摘要br /本課題針對(duì)XH754臥式加工中心的數(shù)控工作臺(tái)的改造,提出了用PMC軸控制工作臺(tái)分度的方案,設(shè)計(jì)完成了工作臺(tái)伺服電機(jī)的慣量和扭矩匹配工作,分析了工作臺(tái)的動(dòng)作流程和數(shù)據(jù)流程。并根據(jù)該加工中心要求的精度,完成了用PMC軸控制功能實(shí)現(xiàn)工作臺(tái)的分度。br /關(guān)鍵詞：工作臺(tái)；PMC；伺服；分度 p class=39。Lkn99539。/p /ppCompleted the design of the worktable servo motor torque and inertia matching br /Abstractbr /In view of the transformation of the numerical control for XH754 horizontal machining center, the plan that controlling worktable indexing with PMC axis is proposed,worktable servomotoramp。nbsp。 is choosed according to the inertia and torque of the load,the worktable action flow and the data flow is analyzed,and the corresponding PMC program is developed. It is showed that the function of the work table index with the PMC axis meets the demand of the index precise after the practical run.br /Key word: Work table。 PMC。 Servo。 Index p class=39。Lkn99539。/p /pp課題來源br /公司的XH754系列高速型臥式加工中心是一種高性能、高效率、高速度的自動(dòng)換刀數(shù)控機(jī)床，分度工作臺(tái)采用高精度鼠牙盤定位，定位精度高。機(jī)電一體化，結(jié)構(gòu)緊湊，占地面積小，操作方便。原機(jī)床的控制采用日本FANUC6M數(shù)控系統(tǒng)，該機(jī)床1984年購進(jìn)，使用已逾10年，控制系統(tǒng)技術(shù)落后，備件問題突出。針對(duì)這一狀況，對(duì)系統(tǒng)進(jìn)行改造，其中就有對(duì)工作臺(tái)的改造，要求實(shí)現(xiàn)5amp。deg。整倍數(shù)角度的分度定位。 p class=39。Lkn99539。/p /pp本課題的主要任務(wù)：br /；br /；br /。br /amp。nbsp。br /本課題提出PMC軸控制工作臺(tái)的分度方案已成功用于東風(fēng)公司XH754的臥式加工中心的數(shù)控改造?，F(xiàn)對(duì)本課題結(jié)論如下：br /，提出對(duì)工作臺(tái)改造，確定了用PMC軸控制的方法對(duì)分度工作臺(tái)。br /，給出了工作臺(tái)伺服電機(jī)慣量的匹配的計(jì)算,PMC軸控制原理，并對(duì)系統(tǒng)相關(guān)參數(shù)進(jìn)行了設(shè)置和調(diào)整。br /，設(shè)計(jì)了PMC軸控制工作臺(tái)分度定位的動(dòng)作流程圖和數(shù)據(jù)流程圖，并編寫相關(guān)的PMC程序。 span class=39。Lkn99539。/span /pbr /br /br /br / p class=39。Lkn99539。/p br /br /br /目錄 字br /第一章 概論amp。nbsp。1br /amp。nbsp。1br / 課題來源amp。nbsp。2br / 課題任務(wù)amp。nbsp。2br / 工作臺(tái)的分類amp。nbsp。2br /amp。nbsp。2br /amp。nbsp。4br /第二章 方案論證amp。nbsp。7br / XH754臥式加工中心概述amp。nbsp。7br / 方案的論證amp。nbsp。8br /amp。nbsp。9br / PMC軸控制和分度轉(zhuǎn)臺(tái)控制對(duì)照表amp。nbsp。10br /amp。nbsp。11br /第三章 PMC軸控制原理amp。nbsp。12br / PMC功能指令amp。nbsp。12br / MOVE（邏輯數(shù)據(jù)傳送）amp。nbsp。12br / ROT（旋轉(zhuǎn)控制）amp。nbsp。12br / COMP（數(shù)值大小判別）amp。nbsp。14br / MULB（二進(jìn)制乘法運(yùn)算）amp。nbsp。14br / COIN(一致性檢測(cè))amp。nbsp。15br / PMC軸控制amp。nbsp。16br / PMC控制方式amp。nbsp。16 p class=39。Lkn99539。/p br / PMC軸控制的步驟amp。nbsp。18br /第四章伺服電機(jī)的選型amp。nbsp。21br / 伺服系統(tǒng)的性能amp。nbsp。21br / 轉(zhuǎn)動(dòng)慣量的計(jì)算amp。nbsp。21br /amp。nbsp。22br / 選擇伺服電動(dòng)機(jī)amp。nbsp。22br / 扭矩的計(jì)算amp。nbsp。24br /第五章 工作臺(tái)分度功能設(shè)計(jì)amp。nbsp。26br / 分度工作臺(tái)機(jī)械傳動(dòng)方案amp。nbsp。26br / PMC軸參數(shù)的設(shè)定amp。nbsp。26br / PMC軸控制程序設(shè)計(jì)amp。nbsp。27br / 工作臺(tái)分度的PMC程序設(shè)計(jì)amp。nbsp。28br / PMC軸的控制框圖amp。nbsp。28br / PMC程序功能框圖amp。nbsp。28br / 工作臺(tái)的動(dòng)作流程圖amp。nbsp。29br / 工作臺(tái)數(shù)據(jù)流程圖amp。nbsp。30br / PMC 軸控制工作臺(tái)分度定位的過程分析amp。nbsp。31br / PMC程序的設(shè)計(jì)amp。nbsp。32br / 小結(jié)amp。nbsp。37br /第六章 結(jié)論amp。nbsp。38br /結(jié)束語amp。nbsp。40br /致謝amp。nbsp。41br /附錄amp。nbsp。44P/P