Analysis example of NC lathe machining process

Complete the processing of parts as shown in Figure 1. Blank size Phi 50 * 114.
Fig. 1 example of turning
1, drawing analysis
(1): processing the parts processing including car end face, cylindrical, chamfer, arc, thread groove etc.. (2) the workpiece coordinate system: the machining needs a U-turn, from drawings size annotation analysis should set two coordinates and two workpiece zero were scheduled for clamping the right end (finishing) - loaded Phi 50 clip round, flat end, tool, set the first part origin. This end face to do finish machining surface, the future is no longer processing.
Turn - clamping Phi 48 cylindrical, flat end, total length measurement, set second part origin (in the finishing end)
(3) change the knife point: (120200)
(4) tolerance processing: the median size tolerance.
2, process
(1) working step and walk the path determined, according to the process determined walk path are as follows: - clamping Phi 50 cylindrical surface, leaning out of the 65mm, rough machining parts left profile: 2 x 45 degree chamfer, Phi 48 outer circle, R20, R16, R10 arc.
Finishing the above profile.
Manual drilling, hole depth to the size requirements.
Outline of rough machining holes.
Precision machining hole profile.
, U-turn installed Phi 48 clip outer circle, rough machining parts on the right side of the outer contour: 2 x 45 degree chamfer, screw excircle, Phi 36 end, cone, Phi 48 excircle circular arc surface.
Finishing the above profile.
Cut slot.
Thread processing. (2) the choice of cutting tools and the determination of the cutting parameters, according to the processing content determined by the cutter as shown in figure 2:
Fig. 2 Tool Selection Chart
T0101: Outline: rough machining tool radius 0.8mm, cutting depth 2mm, spindle speed 800r/min, feed rate 150mm/min.
T0202: outline of finishing: nose radius 0.8mm, 0.5mm depth of cut, the spindle speed 1500r/min, feed rate 80mm/min.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -.
T0404 - thread processing: tool angle of 60 degrees, the spindle speed feed rate 400r/min, 2mm/r (pitch).
Drilling hole: the diameter of the drill bit is 16mm, the spindle speed is 450r/min.
T0606 -- the inner contour of rough machining: tool radius 0.8mm, cutting depth 1mm, spindle speed 500r/min, feed rate 100mm/min.
T0707: inner contour finishing: tool radius 0.8mm, 0.4mm depth of cut, the spindle speed 800r/min, feed rate 60mm/min.
Numerical calculation of unknown point coordinates: P1 (40.7, -33.52), P2 (42.95, -53.36) thread size calculation: the outer circle of the screw thread = 32-0.2=31.84, programming
The tool set after the tip point is located in (120200), the knife has finished processing tool. The clamping Phi 50 outer circle, out of 65mm, the manual flat end face. (Cheng Xulve)