【正文】 in the machine tool industry is very , accuracy, stability, reliability gap, Second, the posite performance of machine have a larger , the gap between the CNC , the other key supporting parts steel raw materials, standard parts, screws, nuts, etc., need to improve the country39。automation of CNC machine tools to further improve, with automatic monitoring tool breakage detection and automatic workpiece and other on manufacturing of CNC machine toolsCNC machine tools is the key equipment to modern manufacturing , country39。s technology to achieve this transformation, first, to hightech, the second is to upgrade machine tools is the key to modern manufacturing equipment, country39。Workpiece positioning and clamping scheme班級：學(xué)號： 姓名：第二篇：數(shù)控專業(yè)英語論文班級：2012級專升本1班姓名：于越學(xué)號：201215310142 Development of CNC machineAbstractChina39。所以，第一道工序一般是進(jìn)行定位面的粗加工和半精加工(有時(shí)包括精加工)，然后再以精基面定位加工其它表面。這樣可使工件定位夾緊穩(wěn)定可靠，利于保證孔與平面的位置精度，減小刀具的磨損，同時(shí)也給孔加工帶來方便。由于次要表面加工工作量小，又常與主要表面有位 置精度要求，所以一般放在主要表面的半精加工之后，精加工之前進(jìn)行。：①先粗后精 先安排粗加工，中間安排半精加工，最后安排精加工和光整加工。(3)以相同定位、夾緊方式或同一把刀加工的工序最好連接進(jìn)行，以減少重復(fù)定位次數(shù)，換刀次數(shù)與挪動(dòng)壓板次數(shù)。順序一般應(yīng)按下列原則進(jìn)行：(1)上道工序的加工不能影響下道工序的定位與夾緊，中間穿插有通用機(jī)床加工工序的也要綜合考慮。6）刀具的進(jìn)退刀（切入與切出）路線也要認(rèn)真考慮，以盡量減少在輪廓處停刀（切削力突然變化造成彈性變形）而留下刀痕，也要避免在輪廓面上垂直下刀而劃傷工件。4）盡量減少程序段數(shù)。2）方便數(shù)值計(jì)算，減少編程工作量。加工路線的合理選擇是非常重要的，因?yàn)樗c零件的加工精度和表面質(zhì)量密卻相關(guān)。在數(shù)控車床上工件定位安裝的基本原則與普通機(jī)床相同。Determine order passes and passes route The cutting line is the index of controlled processing tool relative to the workpiece and the direction of the choice of processing route is very important, because it is part of the machining accuracy and surface quality are closely determining the cutting line is the main consideration the following points: 1）Ensure that parts of the request processing )convenient numerical putation, reduce the programming )find the shortest route to reduce processing time in order to improve processing efficiency air )minimize procedures paragraph )Ensure that workpiece contours of the surface roughness after processing the request should be final, ultimate contours go straight sword )The dilemma knives knife(entry with all the routes have to seriously consider in order to minimize the contours on the cutting edge knife(elastic deformation caused by sudden changes)and left a knife marks, also need to avoid the contours on surface vertical cutter and workpiece arrangements should be based on parts of the structure of the order and stock status and orientation clamp needed to take into account, with a focus on the rigidity of the job is not should be carried out by the following principles:(1)the process of processing cannot affect next process among the positioning and Clamping, punctuated by a universal machine tool manufacturing processes should also be integrated into account.(2)Firstshaped cavity in the process, and then shape processes.(3)In the same location, gripping manner or with a knife processing processes, with a view to reducing duplication best connect with positioning, number changer number number plates and sift.(4)At the same time that you install in the process, many road arrangements should be firstefirstserved basis to the workpiece rigid undermine small processes. cutting forces by sufficient rigidity。 of positioning and clamping。第一篇：數(shù)控專業(yè)英語論文Workpiece positioning and clamping schemeThe workpiece positioning and benchmarks should be consistent with the design basis, and should be prevented with a workpiece positioning, and the best choice.“ ”onetwo sales as a positioning benchmarks in CNC machine tools, benchmarks, and the positioning is carefully to the CNC lathe workpiece positioning installed with basic principles of ordinary machine Install method workpiece workpiece impact the processing accuracy and efficiency in order to give full play to the characteristics of their work, and the CNC machine tools folder installed workpiece should take into account the following factors: far as possible mon fixture, only when you must design and manufacture of special fixture。 design to meet the accuracy requirements。 for ease of cutting。Cutting sequence of arrangements: ① first rough after finishing first roughing, semifinishing intermediate arrangements, final arrangements finishing and polishing.② After hsien Chu at the first part of the Assembly base and work surfaces, and other major surface processing, arrangements such as keyways, after light and threaded holes for fastening and other minor surface to minor surface processing workload small and often has a position with major surface accuracy requirements, it is generally placed after the main surface of the halffinished, done prior to finishing.③ After the first hole for parts such as box, frame, link, base, machining end surface of the plane and hole used as a location, and then machining allows the positioning of workpiece clamping is stable and reliable, which guarantees the position accuracy of hole and plane, reducing tool wear and bring convenience to the hole.④ base to serve as a precision base surface, would be the first to , the first operation is usually positioned surface roughing and semifinishing(sometimes including finishing), and then to finish the base of location machining other example, the top hole machining of shaft ：工件的定位與基準(zhǔn)應(yīng)與設(shè)計(jì)基準(zhǔn)保持一致，應(yīng)防止過定位，對與箱體工件最好選擇“一面兩銷”作為定位基準(zhǔn)，定位基準(zhǔn)在數(shù)控機(jī)床上要仔細(xì)找正。工件的裝夾方法影響工件的加工精度和效率，為了充分發(fā)揮數(shù)控機(jī)床的工作特點(diǎn)，在裝夾工件時(shí)，應(yīng)考慮以下幾種因素：，必須時(shí)才設(shè)計(jì)制造專用夾具； ； ； ； ； ：走刀路線是指數(shù)控加工過程中刀具相對于被加工件的運(yùn)動(dòng)軌跡和方向。在確定走刀路線是主要考慮下列幾點(diǎn): 1）保證零件的加工精度要求。3）尋求最短加工路線，減少空刀時(shí)間以提高加工效率。5）保證工件輪廓表面加工后的粗糙度的要求，最終輪廓應(yīng)安排最后一走刀連續(xù)加工出來。加工順序的安排應(yīng)根據(jù)零件的結(jié)構(gòu)和毛坯狀況，以及定位夾緊的需要來考慮，重點(diǎn)是工件的剛性不被破壞。(2)先進(jìn)行內(nèi)形內(nèi)腔加工序，后進(jìn)行外形加工工序。(4)在同一次安裝中進(jìn)行的多道工序，應(yīng)先安排對工件剛性破壞小的工序。②先主后次 先安排零件的裝配基面和工作表面等主要表面的加工，后安排如鍵槽、緊 固用的光孔和螺紋孔等次要表面的加工。③先面后孔 對于箱體、支架、連桿、底座等零件，先加工用作定位的平面和孔的端面，然后再加工孔。④基面先行 用作精基準(zhǔn)的表面，要首先加工出來。例如，軸類零件頂尖孔的加工。s manufacturing must be from a big country to power, from low to high, from Made in China to Created in China39。s output of CNC machine tools and technology in a way representative of the national manufactur