Bearing sleeve machining sequence and determination of feed line

1. The principle of processing order ( 1) XianCuHouJing 对于粗精加工在一道工序内进行的加工内容，应先对各表面进行全部粗加工，然后再进行半精加工和精加工，以逐步提高加工精度。 Arrangement of the principle requirements: rough turning in a relatively short period of time will cut off most of the machining allowance on various surfaces of the workpiece. If after rough turning left by surplus uniformity can't satisfy the machining requirements, should arrange half fine cars, as a fine car. In order to ensure the machining accuracy, fine car must be one size fits all. ( 2) XianJinHouYuan 先近后远即在一般情况下，离对刀点近的部位先加工，离对刀点远的部位后加工，以缩短刀具移动距离，减少空行程时间。 For turning, after nearly far can also keep the workpiece rigid, is helpful to machining. ( 3) 先内后外、内外交叉 先内后外、内外交叉的原则是指粗加工时先进行内腔、内形粗加工，后进行外形粗加工； When finishing advanced line cavity, shape finishing, appearance after finishing. The principle is not immutable, for some special cases, need to adopt flexible solutions. 2. The determination of feed line ( 1) 最短的空行程路线确定最短的走刀路线，除了依靠大量的实践经验外，还应善于分析，必要时可辅以一些简单的计算。 (1) flexible setup cycle starting point. In many cases when turning processing programming using fixed cycle instruction programming. (2) the reasonable arrangement of return in cutting point. More complex contour machining program compiled by hand, on the premise of not change, the return action, should not return to the tool change point. Arrange feeding line, should try to shorten the knife before the finish with a knife after the distance between the starting point, can meet the requirements of the shortest route of feeding. ( 2) ZuiDuanDeQieXiaoJinGeiLuXian 若能使切削进给路线最短，就可有效地提高生产效率，降低刀具的损耗。 Arrange the shortest route of cutting feed, both of artifacts and processing manufaturability rigidity, can't attend. ( 3) LingJianLunKuoJingJiaGongYiCiZouDaoWanCheng 如果需要以一刀或多刀进行精加工，则其最后一刀要沿轮廓连续加工而成，尽量避免在连续的轮廓中安排切入、切出、换刀或停顿，以免因切削力突然变化而造成弹性变形，使光滑连接的轮廓上产生刀痕等缺陷。 3. To determine the bearing sleeve processing order and feed line ( 1) The determination of machining sequence to determine the order in from outside to inside, from coarse to fine, be determined by the principle of near to far. Work out more in a clamping workpiece surface. Combined with the feature of this structure parts, bearing sleeve left and right end respectively for the design of the multiple dimension benchmark, it can be processed first inner hole at one end and the outer contour surface, and then turned around and processing the other end of the inner hole and outer contour surface. Determine the order processing: flat end face to center hole drill, drill phi 32 hole bottom hole boring phi phi 26 -> coarse 15 ° 32 inner hole and cone and C0. 5 chamfering, fine boring phi and inner hole, 15 ° cone and C0. 5 chamfering and rough turning 50 cylindrical, phi phi 58 steps, R5 arc, chamfering and phi 78 cylindrical surface - C2 half finish turning 50 cylindrical, phi phi 58 step surface, R5 arc, C2 chamfering and phi phi 78 cylindrical surface and fine car at 50, 78 cylindrical surface to turn the clamping flat end face to ensure overall length size, rough boring and the taper hole - fine and taper boring - thick threading large diameter, C2 chamfering and the cylindrical phi 52 - half threading big diameter, phi 52 C2 and the cylindrical chamfering - fine car phi 52 cylindrical - car thread relief groove - M45 external thread. ( 2) The determination of feed line feed line to determine the main is to determine the rough machining and empty trip feed line. On the premise of guarantee the quality of processing, processing with the shortest route of feeding, can not only save the entire process of implementation, also can reduce some unnecessary loss of cutting tool and machine tool feed mechanism of sliding parts wear and tear. According to the above analysis, the FANUC 0 I - 伴侣, TC system on numerical control lathe machining parts, the parts feeding line is very simple, as long as all the G71, G70 coarse and fine car cycle instruction processing inner hole and cylindrical, many complex calculation process can be avoided, and the program becomes simplified. After analysis, the parts on the surface of the outer contour rough turning are shown in table 2 - feeding line 1 and table 2 2.