With the rapid development of social production and science and technology, mechanical products are becoming more and more sophisticated, and the demand is frequently modified. Especially in the fields of aerospace, shipbuilding, military and other mechanical parts, the precision requirements are high, the shape is complex, and the batch size is small. Such products require frequent modification or adjustment of equipment, and ordinary machine tools or highly specialized automated machine tools cannot meet these requirements. In order to solve the above problems, CNC milling machines came into being.
This new type of machine tool has the advantages of strong adaptability, high processing precision, stable processing quality and high efficiency. It integrates various technical achievements such as electronic computer, automatic control, servo drive, precision measurement and new mechanical structure. Through the setting of the machining program, seamless transfer between workpieces can be completed. That is to say, the CNC machining center can complete the machining process of various types of work including milling, drilling, tapping, boring and reaming on a single device by replacing different tools.
We know that the whole machining of the CNC center is controlled by the CNC numerical control system. When the machining program is executed, the machine tool should not be terminated arbitrarily. If there are some problems, such as tool wear and excessive machining allowance, it is not like ordinary processing equipment. You can stop and adjust at will. Therefore, the machining tools used by it are more rigorous than ordinary processing equipment. The following is a brief introduction to the common problems and solutions for machining parts of CNC milling machines:
First, the processing plane is uneven, not only
In the machining of parts of CNC milling machines, the finishing of the surface is an important process, and it is also a process that is often done, which requires high quality of the surface. However, in the actual processing, sometimes the plane that is not flat and not only does not meet the requirements.
The main reason for this problem is that during the finishing process, because the performance of the cutting oil can not meet the processing requirements, when the tool feed speed is too fast, the vibration caused by the tool moving quickly will easily leave an uneven path to the machined surface. . Sometimes there is a certain difference between the tool marks between two adjacent tool paths, which is caused by the inconsistent direction of the cutting of the tool. To avoid this problem, the machining method of the full-cut milling machine should be adopted and the special cutting oil should be selected.
Second, the cutting edge of the finishing milling is too obvious
In the machining of workpieces in CNC milling machines, almost every part will require finishing of the side, and in many cases there will be problems with the seams on the side of the finishing mill that are too obvious. This is absolutely not allowed and will seriously affect the appearance of the parts.
The main reason for this problem is the improper selection of the position and parameters of the infeed and retraction, and the milling methods provided by different machining software will also be different, but the depth selection of the lower knife and the parameter selection of the accessing knife will be provided. In addition, when non-dedicated cutting oil is used, the oil film is broken instantaneously during processing due to insufficient extreme pressure and anti-wear performance, resulting in scratches on the parts.
The relevant adjustments can be made in four aspects. The first is to select the infeed point correctly, the second is to increase the amount of overlap when the middle knife is cut, the third is to use the full cutting depth when finishing the side of the part, and the fourth is the finishing time. Use special cutting oil.
