Causes and improvement methods of common problems in precision CNC machining


Causes and improvement methods of common problems in precision CNC machining

Reasons for the problem:
1. The operator is not accurate when manually operating
2. There are burrs around the mold
3. The sub-center rod is magnetic
4. The four sides of the mold are not vertical
Improve methods:
1. Manual operation should be carefully checked repeatedly, and the points should be at the same point and height as much as possible.
2. Deburring around the mold with oilstone or a file, wipe it clean with a rag, and finally confirm by handhttps://www.cncmachiningptj.com/cncaluminumparts
3. Demagnetize the centering rod before centering the mold (ceramic centering rod or others can be used)
4. Calibrate to check whether the four sides of the mold are vertical (large verticality errors need to be reviewed with the fitter)

Reasons for poor surface accuracy:
1. Unreasonable cutting parameters, rough surface of workpiece
2. The cutting edge of the tool is not sharp
3. The tool clamping is too long, and the blade is too long to avoid the air
4. Chip removal, air blowing, oil flushing is not good
5. Programming the way of cutting, (you can consider down milling as much as possible)
6. The precision CNC machining workpiece has burrs
Improve methods:
1. Cutting parameters, tolerances, margins, speed and feed settings should be reasonable
2. The tool requires the operator to inspect and replace it irregularly
3. When clamping the tool, the operator is required to clamp as short as possible, and the cutting edge should not be too long.
4. For flat knife, R knife, round nose knife down cutting, the speed and feed setting should be reasonable
5. The workpiece has burrs: it is directly related to our machine tool, cutting tool, and the way of cutting. It is necessary to understand the performance of the machine tool and make up the edge with burrs.

Causes of chatter marks:
1. Feed and cutting speed is too fast
2. Insufficient rigidity (machine tool and tool holder)
3. The back angle is too large
Improve methods:
1. Correct the feed and cutting speed of precision CNC machining
2. Use better machine tools and tool holders or change cutting conditions
3. Change to a smaller relief angle and process the cutting edge (use oilstone to sharpen the edge once)

Precision CNC machining
Causes of workpiece wear
1. The machine speed is too fast
2. Hardened material
3. Chip adhesion
4. Improper feed speed (too low)
5. Inappropriate cutting angle
6. The one-time clearance angle of the tool is too small
Improve methods:
1. Slow down and add enough coolant
2. Use advanced knives and tool materials to increase surface treatment methods
3. Change the feed rate, chip size or use cooling oil or air gun to clean the chips
4. Increase the feed rate of precision CNC machining, try down milling
5. Change to the appropriate cutting angle
6. Change to a larger rear angle