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SC029-数控车高级工加工工艺及编程设计【带三维图】【优秀数控类课题】

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关键词：: sc029 数控高级工加工工艺编程设计三维优秀优良课题

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数控车床高级工课题的编写

摘要数控技术是现今社会的一门非常热门的技术，数控技术已运用到各行各业，涉及范围非常广。

工艺分析。所设计的图纸相对应加工工艺的制订，设计图纸中制订工艺是首要工作，结构工艺性需要安排合理。轮廓几何要素分析，在设计图纸过程中难免会有在给定几何条件不足，还有在设计等多方面的原因，可能在图纸上出现构成加工轮廓条件的不充分，尺寸模糊不清及缺陷，会给成产中编程时带来麻烦或无法编程。精度及技术要求分析，分析精度及技术各方面要求是否齐全没有，是否合理，

材料选择。设计图纸在考虑毛坯应该以节省材料为基础。合理的给定一个零件毛坯是必要的。

刀具选择。设计图纸到加工的这一步时，在刀具选择的方面必须确定好，以最少刀具的选择来加工零件，从而实现生产周期的最短。

本文在设计中探索到的一些需要注意的问题以及参考一些相关的资料加以适当扩充的设计零件图纸。通过本次的毕业设计使我更巩固了我的理论知识，也学会了用理论知识运用到实践中去，学会了怎样合理地去分析和解决一些实践的问题，学会了去查资料和自己所学的知识来设计。数控机床加工工艺同生产实际密切相关，其理论源于生产实际，是长期生产实践的总结。我们要注意与生产实际相结合，才能更掌握地把零件给设计和加工好。

关键词工艺分析材料选择刀具选择

第一章数控车床的发展 ……………………………………………………7

1．1 数控机床的概念 …………………………………………………7

1．1．1 数控机床的特点 …………………………………………………7

1．1．2 数控机床使用中应注意的事项 ………………………………… 7

1．2 数控车床程序编制 ………………………………………………10

1．2．1 数控机床编程的方法 ………………………………………………10

1．2．2 数控机床程序编制的内容和步骤 ………………………………10

1．3 数控车床各使用刀具的使用 ……………………………………14

1．3．1 夹具的选择 ………………………………………………………14

1．3．2 工件的安装 ………………………………………………………14

1．3．3 刀具的选择 ………………………………………………………14

第二章数控高级工图纸的工艺

2．1 零件图纸的设计 ……………………………………………………17

2．2 零件图纸工艺分析 …………………………………………………20

2．2．1 走刀路线的确定 …………………………………………………20

2．2．2 工艺分析 …………………………………………………………20

第三章数控车床程序编写

3.1 FANUC车床数控系统 ………………………………………………22

3.1.1 FANUC车床的数控系统 ……………………………………………22

3.1.2 程序概化 …………………………………………………………22

操作安全 ………………………………………………………………………30

结论 ……………………………………………………………………………34

致谢 ……………………………………………………………………………35

参考文献 …………………………………………………………………………36

引言

一数控机床的工作过程

数控机床的工作过程包括以下几个方面：

（1）输入给数控系统输入的有零件加工程序，控制参数和补偿数据等。

（2）译码输入的程序段包括零件的轮廓信息，要求的加工速度以及其他的辅助信息，计算机依靠译码程序来识别这些代码，将加工程序翻译成计算机内部能识别的语言。

（3）数据处理数据处理程序一般包括刀具半径补偿，速度计算和辅助功能的处理。

（4）插补计算轨迹的过程称为插补，即根据给定的曲线类型，起点，终点以及速度，在起点和终点之间进行数据点的密化。

（5）伺服控制将计算机送出的位置进给脉冲或进给指令，经变换和放大后转化为伺服电动机的转动，从而带动机床工作台的移动。

（6）管理程序当一个数据段开始插补时管理程序即着手准备下一个数据段的读入，译码，数据处理，即由它调用各个功能的子程序且保证一个数据段加工过程中将下一个数据段准备就绪，一旦本数据段加工完成即开始下一个数据段的插补加工。

参考文献

1.《现代数控编程技术及应用》王爱玲国防工业出版社2009.3

2．《数控机床与数控编程技术》陈志雄科学出版社 2005. 8

3.《设计产品加工工艺路线方法》陈凌珊《设计与制造》2004年第4期

4.《数控编程》曹凤重庆大学出版社2004.8

5.《数控编程与加工》陈红康山东大学出版社2004.

6.《CNC编程原理与应用》机械工业出版社2004.9

7.《CAD/CAM》李佳天津大学出版社

8.《基于UG CAD/CAM功能的应用的研究》潘春荣《设计与制造》2005.1

9.《master CAM在机械加工中的应用》谷艳丰《设计与制造》2005

10.《数控加工工艺及编程》王维机械工业出版社2004.

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内容简介：: NUMERICAL CONTROL Numerical control is a form of programmable automation in which the processing equipment is controlled by means of numbers， letters， and other symbols The numbers， letters， and symbols are coded in an appropriate format to define a program of instructions for a particular work part or job When the job changes， the program of instructions is changed The capability to change the program is what makes N C suitable for low-and medium-volume production It is much easier to write programs than to make major alterations of the processing equipment Number control lather main use to carry on a car to pare towards revolving body spare parts, the Tang pare, drill to pare, the Jiao pare, offend silk etc. process of work preface. General ability auto inside completion outside cylinder noodles, conic surface, surface of sphere, cylinder thread, slot and carry noodles etc. the slice of work preface pare to process. The host is the topic that the number control lather and include a tool machine body, sign pillar, principal axis and enter etc. is to the organization machine parts. Number control equip, is number control tool machine of core, include hardware and correspond of software, used for an importation numeral turn of spare parts procedure, and completion importation information of saving, the transformation of data, put to repair operation and realization various control function. Drive to equip, he is number control the drive of organization of the tool machine performance parts, include a principal axis to drive unit and enter to the unit, principal axis electrical engineering and enter etc. to electrical engineering. He under the control that number control to equip pass electricity or electricity liquid servo system realization principal axis with enters give drive. When several enter to give allied move, can completion fixed position, straight line, process of flat surface curve and space curve. Assistance equips the index number control tool machine of some necessity of nts1 kit parts, in order to assurance number control tool machine of circulate, such as cool off, row scraps, lubricate, illuminate, monitor etc. It include a liquid to press friendly move equip, row scraps equip, exchange work set, number control to turn Taiwan and number control cent degree head. Plait distance and other subsidiary equipments, can use to carry on the procedure of spare parts to draw up outside machine, saving. Modern number control lather to all have X, Z two stalk of allied move function, knife position and point of a knife arc radius of compensate function, and process fix circulation function. The number control the structure of lather 1. The number control a lather brief introduction The number control constitute of lather: Number control system, bed body, principal axis and enter to the system, turn round a knife, operation front-panel and assistance system etc. (1) The economy number control lather: Adoption step enter electric motor and list slice machine to common the car of the lather pare into to the system carry on reformation behind formation of the simple number control lather. The cost is lower, automation degree and function be all more bad, the car pare to process accuracy also not high, be applicable to request not high of turn round type spare parts of the car pare to process. The economy number control lather (2) Common number control lather: Pare to process a request to carry on the structure according to the car specialized design, equipment in general use number control system but formation of number control lather. Number control system function strong, automation degree with process accuracy also more Ago, be applicable to general turn round type spare parts of the car pare to process. This kind of number control lather can control 2 sit a mark stalk in the meantime, namely x stalk and z stalk. Common number control lather (3)the car pare to process center: At common number control the nts2 foundation of lather up, increment C stalk and motive head, more high class of the tool machine still take a knife database, can control X, Z and C 3 sit mark stalk, allied move control stalk can BE(X, Z),(X, C) or(Z, C).Because increment C stalk and Xian pare a motive head, this kind of number control process of lather function consumedly strengthen, in addition to carry on general the car pare, also can carry on path to pare with stalk toward the Xian, the curved face Xian pare, the center line dont turn round in the spare parts center of bore and path pare toward the drill of bore etc. process. 2. The liquid press card dish and liquid to press a tail The liquid press card dish is number control a car to pare to process clip tight work piece of importance enclosure, rightness general turn round type spare parts can adoption common the liquid press card dish; To the spare parts be clip hold the part isnt the spare parts of cylinder form, demand adoption appropriation card dish; With the stick anticipate direct process spare parts demand adoption spring coil card dish. To stalk to the size and the path is to the specific value bigger spare parts of size, demand adoption install press a tail in the liquid up of live top carry on prop up to the spare parts end tip, then can assurance carry on to the spare parts exactitude of process. The tail has a common liquid to press tail and programmable liquid to press a tail. 3. The number control the knife of lather Number control lather can equipment two kinds of knife: (1) Appropriation knife from lather produce manufacturer oneself development, haft for use is also appropriation of. This kind of the advantage be that the manufacturing cost is low, but lack in general use. (2)in general use knife according to certain in general use standard(like VDI, Germany engineers association) but produce of knife, number control lather production manufacturer can according to number control the function of lather request to carry on a choice allocation. In general use knife nts3 4. The Xian pare a motive head Number control lather knife top to install Xian after pare the motive head can consumedly expand number to control process of lather ability. Such as :Make use of the Xian pare a motive head to carry on stalk to drill a hole to pare stalk toward the slot with Xian. The N C system consists of the following components： data input， the tape reader with the control unit， feedback devices， and the metalcutting machine tool or other type of N C equipment Data input， also called “mantocontrol link”， may be provided to the machine tool manually， or entirely by automatic means Manual methods when used as the sole source of input data are restricted to a relatively small number of inputs Examples of manually operated devices are keyboard dials，pushbuttons， switches， or thumbwheel selectors These are located on a console near the machine Dials ale analog devices usually connected to a syn-chro-type resolver or potentiometer In most cases， pushbuttons，switches， and other similar types of selectors aye digital input devices Manual input requires that the operator set the controls for each operation It is a slow and tedious process and is seldom justified except in elementary machining applications or in special cases In practically all cases， information is automatically supplied to the control unit and the machine tool by cards ， punched tapes ， or by magnetic tape Eightchannel punched paper tape is the most commonly used form of data input for conventional N C systems The coded instructions on the tape consist of sections of punched holes called blocks Each block represents a machine function， a machining operation， or a combination of the two The entire N C program on a tape is made up of an accumulation of these successive data blocks Programs resulting in long tapes all wound on reels like motion-picture film Programs on relatively short tapes may be continuously repeated by joining the two ends of the tape to form a loop Once nts4 installed， the tape is used again and again without further handling In this case， the operator simply loads and unloads the parts Punched tapes ale prepared on type writers with special tapepunching attachments or in tape punching units connected directly to a computer system Tape production is rarely error-free Errors may be initially caused by the part programmer， in card punching or compilation， or as a result of physical damage to the tape during handling， etc Several trial runs are often necessary to remove all errors and produce an acceptable working tape While the data on the tape is fed automatically， the actual programming steps ale done manually Before the coded tape may be prepared， the programmer， often working with a planner or a process engineer, must select the appropriate N C machine tool， determine the kind of material to be machined， calculate the speeds and feeds， and decide upon the type of tooling needed. The dimensions on the part print are closely examined to determine a suitable zero reference point from which to start the program A program manuscript is then written which gives coded numerical instructions describing the sequence of operations that the machine tool is required to follow to cut the part to the drawing specifications The control unit receives and stores all coded data until a complete block of information has been accumulated It then interprets the coded instruction and directs the machine tool through the required motions The function of the control unit may be better understood by comparing it to the action of a dial telephone， where， as each digit is dialed， it is stored When the entire number has been dialed， the equipment becomes activated and the call is completed Silicon photo diodes， located in the tape reader head on the control unit，detect light as it passes through the holes in the moving tape The light beams are converted to electrical energy， which is amplified to further strengthen the nts5 signal The signals are then sent to registers in the control unit, where actuation signals are relayed to the machine tool drives Some photoelectric devices are capable of reading at rates up to 1000 characters per second High reading rates are necessary to maintain continuous machinetool motion； otherwise dwell marks may be generated by the cutter on the part during contouring operations The reading device must be capable of reading data blocks at a rate faster than the control system can process the data A feedback device is a safeguard used on some N C installations to constantly compensate for errors between the commanded position and the actual location of the moving slides of the machine tool An N C machine equipped with this kind of a direct feedback checking device has what is known as a closed-loop system Positioning control is accomplished by a sensor which， during the actual operation， records the position of the slides and relays this information back to the control unit Signals thus received ale compared to input signals on the tape， and any discrepancy between them is automatically rectified In an alternative system， called an openloop system， the machine is positioned solely by stepping motor drives in response to commands by a controllers There are three basic types of NC motions, as follows: Point-to-point or Positional Control In point-to-point control the machine tool elements (tools, table, etc.) are moved to programmed locations and the machining operations performed after the motions are completed. The path or speed of movement between locations is unimportant; only the coordinates of the end points of the motions are accurately controlled. This type of control is suitable for drill presses and some boring machines, where drilling, tapping, or boring operations must be performed at various locations on the work piece. Straight-Line or Linear Control Straight-Line control systems are able to move the cutting tool parallel to one of the major axes of the machine tool at a controlled rate suitable for machining. It is normally only possible to move in nts6 one direction at a time, so angular cuts on the work piece are not possible, consequently, for milling machines, only rectangular configurations can be machined or for lathes only surfaces parallel or perpendicular to the spindle axis can be machined. This type of controlled motion is often referred to as linear control or a half-axis of control. Machines with this form of control are also capable of point-to-point control. Continuous Path or Contouring Control In continuous path control the motions of two or more of the machine axes are controlled simultaneously, so that the position and velocity of the can be tool are changed continuously. In this way curves and surfaces can be machined at a controlled feed rate. It is the function of the interpolator in the controller to determine the increments of the individual controlled axes of the machines necessary to produce the desired motion. This type of control is referred to as continuous control or a full axis of control. Some terminology concerning controlled motions for NC machines has been introduced. For example, some machines are referred to as four-or five-or even six-axis machines. For a vertical milling machine three axes of control are fairly obvious, these being the usual X, Y, Z coordinate directions. A fourth or fifth axis of control would imply some form of rotary table to index the work piece or possibly to provide angular motion of the work head. Thus, in NC terminology an axis of control is any controlled motion of the machine elements (spindles, tables, etc). A further complication is use of the term half-axis of control; for example, many milling machines are referred to as 2.5-axis machine. This means that continuous control is possible for two motions (axes) and only linear control is possible for the third axis. Applied to vertical milling machines, 2.5axis control means contouring in the X, Y plane and linear motion only in the Z direction. With these machines three-dimensional objects have to be machined with water lines around the surface at different heights. With an alternative terminology the same machine could be called a 2CL machine (C for continuous, L for linear control). Thus, a nts7 milling machine with continuous control in the X, Y, Z directions could be termed be a three-axis machine or a 3c machine, similarly, lathes is usually two axis or 2C machines. The degree of work precision depends almost entirely upon the accuracy of the lead screw and the rigidity of the machine structure With this system there is no self-correcting action or feedback of information to the control unit In the event of an unexpected malfunction， the control unit continues to put out pulses of electrical current If， for example，the table on a N C milling machine were suddenly to become overloaded， no response would be sent back to the controller Because stepping motors are not sensitive to load variations， many N C systems are designed to permit the motors to stall when the resisting torque exceeds the motor torque Other systems are in use， however， which in spite of the possibility of damage to the machine structure or to the mechanical system， ale designed with special hightorque stepping motors In this case， the motors have sufficient capacity to “overpower the system in the event of almost any contingency nts8 数控数控是可编程自动化技术的一种形式，通过数字、字母和其他符号来控制加工设备。数字、字母和符号用适当的格式编码为一个特定工件定义指令程序。当工件改变时，指令程序就改变。这种改变程序的能力使数控适合于中、小批量生产，写一段新程序远比对加工设备做大的改动容易得多。数控车床主要用来对旋转体零件进行车削、镗削、钻削、铰削、攻丝等工序的加工。一般能自动完成内外圆柱面、圆锥面、球面、圆柱螺纹、槽及端面等工序的切削加工。主机是数控车床的主题，包括机床身、立柱、主轴、进给机构等机械部件。数控装置，是数控机床的核心，包括硬件以及相应的软件，用于输入数字化的零件程序，并完成输入信息的存储、数据的变换、插补运算以及实现各种控制功能。驱动装置，他是数控机床执行机构的驱动部件，包括主轴驱动单元、进给单元、主轴电机及进给电机等。他在数控装置的控制下通过电气或电液伺服系统实现主轴和进给驱动。当几个进给联动时，可以完成定位、直线、平面曲线和空间曲线的加工。辅助装置，指数控机床的一些必要的配套部件，用以保证数控机床的运行，如冷却、排屑、润滑、照明、监测等。它包括液压和气动装置、排屑装置、交换工作台、数控转台和数控分度头。编程及其他附属设备，可用来在机外进行零件的程序编制、存储等。现代数控车床都具有 X、 Z两轴的联动功能、刀具位置和刀尖圆弧半径的补偿功能、以及加工固定循环功能。数控车床的结构 1.数控车床简介数控车床的组成：数控系统、床身、主轴、进给系统、回转刀架、操作面板和辅助系统等。 (1)经济型数控车床：采用步进电动机和单片机对普通车床的车削进给系统进行改造后形成的简易型数控车床。成本较低，自动化程度和功能都比较差，车削加工精度也不高，适用于要求不高的回转类零件的车削加工。 nts9 经济型数控车床 (2)普通数控车床：根据车削加工要求在结构上进行专门设计，配备通用数控系统而形成的数控车床。数控系统功能强，自动化程度和加工精度也比较高，适用于一般回转类零件的车削加工。这种数控车床可同时控制两个坐标轴，即 x轴和 z轴。普通数控车床 (3)车削加工中心：在普通数控车床的基础上，增加了 C轴和动力头，更高级的机床还带有刀库，可控制 X、 Z和 C三个坐标轴，联动控制轴可以是 (X、 Z)、 (X、C)或 (Z、 C)。由于增加了 C轴和铣削动力头，这种数控车床的加工功能大大增强，除可以进行一般车削外，还可以进行径向和轴向铣削、曲面铣削、中心线不在零件回转中心的孔和径向孔的钻削等加工。 2.液压卡盘和液压尾架液压卡盘是数控车削加工时夹紧工件的重要附件，对一般回转类零件可采用普通液压卡盘；对零件被夹持部位不是圆柱形的零件，则需要采用专用卡盘；用棒料直接加工零件时需要采用弹簧卡盘。对轴向尺寸和径向尺寸的比值较大的零件，需要采用安装在液压尾架上的活顶尖对零件尾端进行支撑，才能保证对零件进行正确的加工。尾架有普通液压尾架和可编程液压尾架。 3.数控车床的刀架数控车床可以配备两种刀架： (1)专用刀架由车床生产厂商自己开发，所使用的刀柄也是专用的。这种刀架的优点是制造成本低，但缺乏通用性。 (2)通用刀架根据一定的通用标准 (如 VDI，德国工程师协会 )而生产的刀架，数控车床生产厂商可以根据数控车床的功能要求进行选择配置。 4.铣削动力头数控车床刀架上安装铣削动力头后可以大大扩展数控车床的加工能

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