1. Workpiece overcut:
reason:
1. The knife is fired, the knife is not strong enough, too long or too small. Causes the knife to bounce.
2. Improper operation by the operator.
3. The cutting allowance is uneven. (For example: leave 0.5 for the side of the curved surface and 0.15 for the bottom)
4. Improper cutting parameters (such as: too large tolerance, too fast SF setting, etc.).
improve:
1. The principle of using a knife: it can be big or small, short or long.
2. Add the corner cleaning program, and keep the margin as even as possible (leave the same margin on the side and bottom).
3. Reasonably adjust the cutting parameters, and round the corners with large margins.
4. Using the SF function of the machine tool, the operator can fine-tune the speed to achieve the best cutting effect of the machine tool.
Second, the score:
reason:
1. The operator is not accurate in manual operation, and the manual operation is wrong.
2. There are burrs around the mold.
3. The center rod is magnetic.
4. The four sides of the mold are not vertical.
improve:
1. Manual operation should be carefully checked repeatedly, and the points should be at the same point and height as much as possible.
2. Use oil stone or file to deburr around the mold, wipe it with a rag, and finally confirm it by hand.
3. Demagnetize the centering rod before centering the mold (ceramic centering rod or others can be used).
4. Calibrate the meter to check whether the four sides of the mold are vertical, (if the verticality error is large, you need to review the plan with the fitter).
3. Tool setting:
reason:
1. The operator is not accurate in manual operation, and the manual operation is wrong.
2. The tool clamping is wrong.
3. The blade on the flying knife is wrong (the flying knife itself has a certain error).
4. There is an error between the R knife, the flat knife and the flying knife.
improve:
1. Manual operation should be carefully checked repeatedly, and the knife should be set at the same point as much as possible.
2. When the tool is clamped, blow it with an air gun or wipe it with a rag.
3. When the upper blade of the flying knife needs to measure the blade and the bottom surface of the knife, one blade can be used.
4. A separate tool setting program can avoid the error between R knife, flat knife and flying knife.
4. Collider-programming:
reason:
1. The safety height is not enough or not set (the knife or collet collides with the workpiece when G00 is rapidly fed).
2. The tool on the program list and the actual program tool are wrongly written.
3. The tool length (blade length) on the program sheet and the actual processing depth are wrongly written.
4. The depth Z-axis reading and the actual Z-axis reading on the program sheet are incorrectly written.
5. The coordinates are set incorrectly during programming.
improve:
1. Accurate measurement of the height of the workpiece also ensures that the safety height is above the workpiece.
2. The tool on the program sheet should be consistent with the actual program tool (try to use the automatic program sheet or use the picture to generate the program sheet).
3. Measure the actual processing depth on the workpiece, write down the length of the tool and the length of the blade clearly on the program sheet (generally, the length of the tool holder is 2-3MM higher than the workpiece, and the length of the blade is 0.5-1.0MM).
4. Take the actual Z-axis number on the workpiece, and write it clearly on the program sheet. (This operation is generally written manually and needs to be checked repeatedly).
5. Collider-operator:
reason:
1. Depth Z axis tool setting error.
2. The number of hits in the middle and the number of operations are wrong (such as: unilateral fetch without feed radius, etc.).
3. Use the wrong knife (for example: D4 knife is processed with D10 knife).
4. The program goes wrong (for example: A7.NC goes to A9.NC).
5. The hand wheel is turned in the wrong direction during manual operation.
6. Press the wrong direction during manual rapid feed (for example: -X press +X).
improve:
1. In depth Z-axis tool setting, you must pay attention to the position of the tool setting. (bottom, top, analysis, etc.).
2. Repeated checks should be made after the number of hits and operations are completed.
3. When clamping the tool, it must be checked repeatedly with the program list and the program before loading.
4. The program should be followed one by one in order.
5. When using manual operation, the operator himself must strengthen the operation proficiency of the machine tool.
6. When moving quickly manually, the Z axis can be raised above the workpiece before moving.
6. Surface accuracy:
reason:
1. The cutting parameters are unreasonable, and the curved surface of the workpiece is rough.
2. The cutting edge of the tool is not sharp.
3. The tool clamping is too long, and the cutting edge is too long.
4. Chip removal, air blowing, and oil flushing are not good.
5. Program the way of cutting tool (down milling can be considered as much as possible).
6. The workpiece has burrs.
improve:
1. Cutting parameters, tolerances, margins, and speed 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 it as short as possible, and the blade should not be too long.
4. For the downcutting of flat knife, R knife and round nose knife, the setting of speed and feed should be reasonable.
5. The workpiece has burrs: it is directly related to our machine tool, cutting tool and cutting method. Therefore, we need to understand the performance of the machine tool and make up for the edge with burrs.
