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1、附 录A数控车床作为普通车床的替代品，已经开始普及，但是对于数控车加工的工艺装备和参数设定往往还有依靠经验给出的情况，这对于发挥数控高效率工作并无益处。 数控车床加工的工艺与普通车床的加工工艺类似，但由于数控车床是一次装夹，连续自动加工完成所有车削工序，因而应注意以下几个方面。1、合理选择切削用量 对于高效率的金属切削加工来说，被加工材料、切削工具、切削条件是三大要素。这些决定着加工时间、刀具寿命和加工质量。经济有效的加工方式必然是合理的选择了切削条件。切削条件的三要素：切削速度、进给量和切深直接引起刀具的损伤。伴随着切削速度的提高，刀尖温度会上升，会产生机械的、化学的、热的磨损。切削速度提高
2、20%，刀具寿命会减少1/2。进给条件与刀具后面磨损关系在极小的范围内产生。但进给量大，切削温度上升，后面磨损大。它比切削速度对刀具的影响小。切深对刀具的影响虽然没有切削速度和进给量大，但在微小切深切削时，被切削材料产生硬化层，同样会影响刀具的寿命。 用户要根据被加工的材料、硬度、切削状态、材料种类、进给量、切深等选择使用的切削速度。最适合的加工条件的选定是在这些因素的基础上选定的。有规则的、稳定的磨损达到寿命才是理想的条件。 然而，在实际作业中，刀具寿命的选择与刀具磨损、被加工尺寸变化、表面质量、切削噪声、加工热量等有关。在确定加工条件时，需要根据实际情况进行研究。对于不锈钢和耐热合金等难加
3、工材料来说，可以采用冷却剂或选用刚性好的刀刃。 2、合理选择刀具 (1)粗车时，要选强度高、耐用度好的刀具，以便满足粗车时大背吃刀量、大进给量的要求。 (2)精车时，要选精度高、耐用度好的刀具，以保证加工精度的要求。 (3) 为减少换刀时间和方便对刀，应尽量采用机夹刀和机夹刀片。 3、合理选择夹具 (1) 尽量选用通用夹具装夹工件，避免采用专用夹具； (2) 零件定位基准重合，以减少定位误差。 4、确定加工路线 加工路线是指数控机床加工过程中，刀具相对零件的运动轨迹和方向。 (1)应能保证加工精度和表面粗糙要求； (2)应尽量缩短加工路线，减少刀具空行程时间。 5、加工路线与加工余量的联系 目
4、前，在数控车床还未达到普及使用的条件下，一般应把毛坯上过多的余量，特别是含有锻、铸硬皮层的余量安排在普通车床上加工。如必须用数控车床加工时，则需注意程序的灵活安排。 附 录BCNC lathe as a substitute for ordinary lathe, has begun to spread, but for NC machining technology and equipment and parameter settings often have to rely on the experience given the circumstances, which for the e
5、fficient work of NC did not play good. CNC lathe process-sing technology and processing technology is similar but is a fixture as CNC lathes, turning continuous automatic processing to complete all the processes, and therefore should pay attention to the following areas.1A reasonable choice of cutti
6、ngFor high efficiency metal cutting, it is processed materials, cutting tools, cutting conditions are the three elements. These determine the processing time, tool life and machining quality. Cost-effective processing methods must be a reasonable choice of the cutting conditions. Three elements of c
7、utting conditions: cutting speed, feed rate and cutting depth of the damage directly caused by the tool. With the increased cutting speed, tool tip temperature will rise, will have mechanical, chemical, thermal wear and tear. 20% increase in cutting speed, tool life will be reduced by 1 / 2. Feeding
8、 conditions and tool wear ties in the back of a very small range of produce. However, feeding a large amount of cutting temperature rise, followed by abrasion. Tool than the cutting speed on the impact of small. Depth of cut of the tool cutting speed and feed although not large, but in the small cut
9、ting depth of cut, hardened layer produced by the cutting material, it will also affect the tools life. The user is processed according to the material, hardness, cutting conditions, material type, feed rate, depth of cut and so choose to use the cutting speed. The most suitable processing condition
10、s are selected on the basis of these factors the selected. A regular and stable life of the wear to the ideal conditions.However, in actual operation, the choice of tool life and tool wear, dimensional change is processed, surface quality, cutting noise, processing, heat and so on. In determining th
11、e processing conditions, the need to study the actual situation. Stainless steel and heat-resistant alloys for difficult to machine materials, it can be rigid with a good selection of coolant or blade.2A reasonable selection tool(1) Rough car, to choose the strength, durability good tool to meet the
12、 rough car back to eat a large quantity of knives, large feed requirements.(2) Fine car, to choose the high precision, durability good tool to ensure the processing precision. (3) To reduce tool change time and convenience on the knife, should be adopted in machines and machine clip folder knife bla
13、de. 3. Reasonable choice of fixture (1) Try to use common workpiece clamping fixture to avoid the use of special fixtures; (2) Parts locating datum overlap, to reduce the positioning error. 4. Determine the processing route Processing line is the index of control of machining process, the tool relat
14、ive to the trajectory and orientation of parts. (1) Should be able to ensure the machining accuracy and surface roughness requirements; (2) Processing line should be as short as possible, to reduce air travel time of the tool. 5. Processing, and the allowance of the contact line At present, the increasing use of CNC lathe has not yet reached the condition, the general should be too rough on the margin, especially with forging, casting hard cortical margin arrangements on the lathe processing. If you must use the CNC lathe processing, please note that the program flexibility.
