cnc turning technology

The quality of Turning Large Parts on Horizontal Lathe

Large turning parts

In the processing of large horizontal lathes, the constant-distance ripples and chaotic ripples often occur repeatedly. How to solve this annoying problem? Please listen to the KANGDING technicians to help you.

In view of the repeated occurrence of pitch ripples in large horizontal lathes during turning. The possible reason is that the meshing gap of the transmission gear of the feed system is abnormal or damaged. The solution is very simple, just correct the gap. Sometimes, the gap between the pressure plate on the longitudinal sides of the large slide plate and the bed guide rail is too large, and the fixed-distance ripple appears repeatedly, and it is enough to adjust the gap appropriately. If the polished rod is bent, the coaxiality between the hole supporting the polished rod and the polished rod is too poor, or the rod is not parallel to the bed rail, it will cause the fixed distance wave to appear. At this time, straighten up and adjust the parallelism.

Large-scale horizontal lathes often have various problems in turning processing: For example, the roundness is out of tolerance, the end face perpendicularity and the flatness are out of tolerance, etc. Here is how to solve such problems.

The out-of-roundness situation in the machining of the horizontal large lathe may be related to the following three situations: One is that the matching screws of the chuck flange and the spindle are loose, or the chuck positioning surface is loose. The solution is to re-tighten. The second is that the bearing clearance of the main shaft is large, the matching clearance between the outer diameter of the main shaft sleeve and the box body is large, or the roundness of the main shaft journal is out of tolerance. In this case, the clearance should be readjusted or the main journal should be ground. The third is that the wall of the workpiece hole is thin and the clamping is deformed. Workers can use plastic clamps or reserve process heads for easy clamping.

Large turning parts

Large turning parts

The cylindricity is poor, and there are many reasons for this.
1. The blank is bent. In this case, only need to be straightened.
2. There is a problem that the axis of the lathe spindle and the guide surface of the bed are not parallel in the horizontal plane;
3. The front and back tops are not equal in height or the center is shifted;
If the top tightening force is improper, the problem of poor cylindricity will also occur. Workers should adjust the clamping force or switch to elastic top clamps.
In addition to the four reasons listed above, there are many reasons that can cause poor cylindricity in horizontal large lathe machining. Insufficient clamping rigidity of the workpiece can also cause this problem. Workers need to change the front and rear top clamping to chuck, top clamping, or use tool holders, brackets, etc. to increase the machining rigidity of the workpiece. The tool is worn out in one feed or the tool shaft is too thin, causing the tool to give way. Workers should reduce the turning speed, improve the wear resistance of the tool and increase the rigidity of the tool holder; When turning stress and turning heat produce deformation, the stress should be eliminated, the turning speed and feed rate should be increased as much as possible, the cutting thickness should be reduced, the turning process should be performed multiple times, and the cooling and lubrication should be strengthened; Too much distance between the tip of the tool and the support of the tool post can also cause this problem. Just reduce the distance appropriately.

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