【正文】 畢 業(yè)設(shè)計（外文翻譯 ） 1 英文原文 CNC machine tools While the specific intention and application for CNC machines vary from one machine type to another, all forms of CNC have mon benefits. Here are but a few of the more important benefits offered by CNC equipment. The first benefit offered by all forms of CNC machine tools is improved automation. The operator intervention related to producing workpieces can be reduced or eliminated. Many CNC machines can run unattended during their entire machining cycle, freeing the operator to do other tasks. This gives the CNC user several side benefits including reduced operator fatigue, fewer mistakes caused by human error, and consistent and predictable machining time for each workpiece. Since the machine will be running under program control, the skill level required of the CNC operator (related to basic machining practice) is also reduced as pared to a machinist producing workpieces with conventional machine tools. The second major benefit of CNC technology is consistent and accurate workpieces. Today39。s CNC machines boast almost unbelievable accuracy and repeatability specifications. This means that once a program is verified, two, ten, or one thousand identical workpieces can be easily produced with precision and consistency. A third benefit offered by most forms of CNC machine tools is flexibility. Since these machines are run from programs, running a different workpiece is almost as easy as loading a different program. Once a program has been verified and executed for one production run, it can be easily recalled the next time the workpiece is to be run. This leads to yet another benefit, fast change over. Since these machines are very easy to set up and run, and since programs can be easily loaded, they allow very short setup time. This is imperative with today39。s justintime (JIT) product requirements. Motion control the heart of CNC The most basic function of any CNC machine is automatic, precise, and consistent motion control. Rather than applying pletely mechanical devices to cause motion as is required on most conventional machine tools, CNC machines allow motion control in a revolutionary manner2. All forms of CNC equipment have two or more directions of motion, called axes. These axes can be precisely and automatically positioned along their lengths of travel. The two most mon axis types are linear (driven along a straight path) 畢 業(yè)設(shè)計（外文翻譯 ） 2 and rotary (driven along a circular path). Instead of causing motion by turning cranks and handwheels as is required on conventional machine tools, CNC machines allow motions to be manded through programmed mands. Generally speaking, the motion type (rapid, linear, and circular), the axes to move, the amount of motion and the motion rate (feedrate) are programmable with almost all CNC machine tools. A CNC mand executed within the control tells the drive motor to rotate a precise number of times. The rotation of the drive motor in turn rotates the ball screw. And the ball screw drives the linear axis (slide). A feedback device (linear scale) on the slide allows the control to confirm that the manded number of rotations has taken place3. Refer to . Though a rather crude analogy, the same basic linear motion can be found on a mon table vise. As you rotate the vise crank, you rotate a lead screw that, in turn, drives the movable jaw on the vise. By parison, a linear axis on a CNC machine tool is extremely precise. The number of revolutions of the axis drive motor precisely controls the amount of linear motion along the axis. How axis motion is manded understanding coordinate systems It would be infeasible for the CNC user to cause axis motion by trying to tell each axis drive motor how many times to rotate in order to mand a given linear motion amount4. (This would be like having to figure out how many turns of the handle on a table vise will cause the movable jaw to move exactly one inch!) Instead, all CNC controls allow axis motion to be manded in a much simpler and more logical way by utilizing some form of coordinate system. The two most popular coordinate systems used with CNC machines are the rectangular coordinate system and the polar coordinate system. By far, the more popular of these two is the rectangular coordinate system. The program zero point establishes the point of reference for motion mands in a CNC program. This allows the programmer to specify movements from a mon location. 畢 業(yè)設(shè)計（外文翻譯 ） 3 If program zero is chosen wisely, usually coordinates needed for the program can be taken directly from the print. With this technique, if the programmer wishes the tool to be sent to a position one inch to the right of the program zero point, is manded. If the programmer wishes the tool to move to a position one inch above the program zero point, is manded. The control will automatically determine how many times to rotate each axis drive motor and ball screw to make the axis reach the manded destination point . Th