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Briefly introduce common problems and solutions for machining parts of CNC milling machines

Jun 13, 2019

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. Selecting a quality machine tool to look at ALLES CNC, such products need to be frequently modified or adjusted equipment, ordinary machine tools or highly specialized automated machine tools can not meet these requirements. In order to solve the above problems, the machining center 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 workpiece will require a finishing surface, and in many cases there will be a problem that the seam of the finishing side is too obvious. This is absolutely not allowed, which 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 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 ruptured instantaneously during the processing due to insufficient extreme pressure and anti-wear performance, resulting in scratches on the workpiece. Choosing a quality machine tool attachment to look for Titanium Machinery, in order to avoid the above problems, you can make adjustments 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 performing the side finishing, and the fourth is to select the finishing. Special cutting oil.

Third, the change of the knife when finishing milling

 

In normal machining and high-speed machining, the tool needs to be replaced. If the parameter adjustment is not paid attention to during the tool change operation, obvious traces will appear, which will seriously affect the appearance of the workpiece.

 

When finishing the bottom surface or the side surface, the occurrence of the knife mark is a common phenomenon. Many times people think that this is an inevitable error. In fact, this can be completely avoided. In order to solve this problem, in the machining of the workpiece, the finishing of the concave corner needs to be replaced by a small tool. Since it will be oscillated during the machining process, it will easily lead to the blade at the corner. .

4. After finishing, leave a burr or a front on the surface or side.

 

Modern workpiece processing requires more and more surface, and it is not acceptable for the appearance of burrs or spurs. If the boring tool is used to correct the workpiece, it will affect the accuracy and size of the workpiece. It is used directly after milling and no longer needs to be polished later. However, in actual production, there will still be a large number of burrs and fronts.

 

To solve this problem, you must pay great attention to the use of the tool. Use a dedicated tool to ensure sharp cutting. Select the quality machine tool accessories to look for Titanium machinery, in addition, we must also do the planning of the cutting path, increase the secondary polishing path, that is, first machine the surface, then machine the side, and then machine the surface, so that you can ensure No burrs and fronts are useful for workpieces that cannot be polished.

5. Finishing of special shaped workpieces

 

For the finishing of some special-shaped workpieces, the software usually has a fitting error. Sometimes, if the calculation error is too large, the workpiece will be deformed and the appearance will be affected. To solve this problem, it is necessary to start from the software and control the error. This value is relatively reasonable, and it does not affect the speed of calculation or deformation of the workpiece.

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