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1.The processing plane is not flat and not smooth
In the parts processing of CNC machine tools, the finishing of the surface is an important process, and it is also a frequently done process, which requires high surface quality. However, in actual processing, sometimes uneven and rough surfaces are obtained, which does not meet the requirements.
The main reason for this problem is that the feed speed is too fast during finishing, and the vibration caused by the rapid movement of the tool will easily leave an uneven path on the processing surface. In addition, there is a problem that when finishing the opposite side, sometimes the tool marks between two adjacent tool paths will have a certain difference, which is caused by the inconsistent cutting direction of the tool. This should be avoided. The problem is that the full down milling method should be used.
2.The knife mark on the side of the finishing machine is too obvious
In the workpiece processing of CNC machine tools, almost every workpiece requires fine milling of the side surface, and in many cases, the problem of too obvious tool marks on the side surface of the finishing milling will occur. This is absolutely not allowed, and it will seriously affect the appearance of the workpiece.
The main reason for this problem is the improper selection of the position and parameters of the advance and retreat, and the cutting in the depth layer. There are many kinds of processing software, and the milling methods provided by different processing software will be different, but they will provide the depth selection of the cutting tool and the parameter selection of the cutting tool. If you want to avoid the above improvement problems, you can make relevant adjustments from three aspects. The first is to select the entry point correctly, it should be selected at the extreme edge, not in the middle, and the exit point cannot be on the same side; the second is if the knife must be cut in the middle, When advancing and retreating the knife, add an overlap amount; thirdly, when performing side finishing, it is best to use full-cut deep processing.
3.Tool change marks during fine milling
In ordinary processing and high-speed processing, the tool needs to be replaced, and if you do not pay attention to the relevant adjustment of the parameters during the tool change operation, obvious traces will appear, which will seriously affect the appearance of the workpiece.
When performing fine milling on the bottom or side surface, it is a common phenomenon that tool marks appear. Many times people think that this is an unavoidable error. In fact, it is completely avoidable. In the processing of the workpiece, the finishing of the concave corners needs to be replaced with small tools. Because of the force and swing during the processing, it is easy to produce traces of the tool at the corners.
4.After finishing, leave burrs or sharp edges on the surface or side
Modern workpiece processing has higher and higher requirements on the surface, and the appearance of burrs or cracks is not acceptable. If the workpiece is corrected with a file, it will also affect the accuracy and size of the workpiece. It is used directly after milling, and no further grinding is required. But in actual production, there will still be a lot of burrs and batches.
To solve this problem, you must pay great attention to the use of tools, and use special tools to ensure sharp cutting. In addition, it is necessary to plan the tool path well, add a second finishing tool path, which is to process the surface first, then process the side surface, and then process the surface, so as to ensure that there are no burrs and sharp edges. Polished workpieces are useful.
5.for the finishing of special-shaped workpieces
For the finishing of some special-shaped workpieces, the software usually has fitting errors. Sometimes if the calculated error is too large, it will cause the deformation of the workpiece and affect the appearance. To solve this problem, it is necessary to start from the software and carry out reasonable control of the error, which will neither affect the calculation speed nor cause deformation of the workpiece.
6.Severe tool wear causes errors
The accuracy of the tool directly affects the quality of the workpiece, and excessive wear of the tool during the machining process will cause the deviation of the workpiece size. The reasons for rapid tool wear include its own material, workpiece material, cutting process parameters, cutting oil performance and other aspects. If the tool wears too fast, the machine should be stopped and the root cause should be found and eliminated before processing.
The above are some common problems and precautions. A good process environment and rigorous process are the keys to improving the level of process.
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