Numerical control machine tools can logically handle the movement of the machine tools with control codes or other symbolic instructions, and automatically make parts according to the shapes and dimensions required by the drawings. In order to achieve the height of the machine tool automation and composite centralization. The appearance of NC machine tool has solved the problem of complex, precision, small batch, multi-variety parts machining, but it is easy to appear in the process of tool wear, machining allowance and so on. The following is a brief introduction to the common problems and solutions of NC machine tools:

一．Processing plane is uneven, not only

In the machining of the parts of NC machine tool, it is an important process to finish the surface, and it is often to do the working procedure, which requires high quality of the surface. However, in actual processing, sometimes the plane is not peaceful. The main reason for this problem is that the feed speed is too fast during finishing. Because of the vibration caused by the rapid movement of the tool, it is easy to leave an uneven path to the machining surface. In addition to this, there is also a problem that when finishing on the opposite side, sometimes there are certain differences between the two adjacent cutting paths, which are caused by the fact that the cutting direction of the cutter is not necessarily caused by the cutting direction. We should avoid this same topic. You should use the full version.

二 the cutting mark on the side of finishing is too obvious.

In the machining of NC machine tools, almost every workpiece will require the finishing milling side, and in many cases, there will be a problem of too obvious a knife mark on the finish milling side. This is absolutely not permitted. The main reason why the appearance of the workpiece can be seriously affected is the improper selection of the position and parameters of the advance and retreat cutter and the cutting tool under the depth stratification. There are many kinds of processing software. Different processing software will also provide different milling square, but will provide the depth of the cutter selection and the number of the choice of the knife. To avoid the improvement above, you can adjust from three aspects. The first is to select the right point of the feed, should be selected in the edge, not in the middle, the point can no longer be the same side: second, if must be in the middle of the knife, in the advance and back of the knife, the increase in an overlap; The third is in the side of the finishing, it is best to use full cutting deep processing.

三 Tool changing marks in finishing milling

In normal machining and high speed machining, tool replacement is required, and if the parameters are not adjusted with the injection of information when the tool is changed, there will be obvious marks. When finishing the bottom or side of the workpiece, it is a common phenomenon to have a knife mark, which is often regarded as an unavoidable error. In fact, this is completely avoidable in the machining of the workpiece, the finishing of the corner of the concave needs to be carried out by replacing the small tool. Because of the force and swinging in the process of machining, it is easy to produce the mark of the cutter at the corner.

四 After finishing, the surface or side of the surface remains burr or crimping.

Modern workpiece processing requires higher surface requirements, and it is not acceptable for burrs or batches to appear. If the workpiece is corrected with a knife, it will also affect the precision and size of the workpiece, etc. In order to be cut first and then used directly, there is no longer need for late grinding. However, in the actual production, there will still be a large number of burrs and batches, and to solve this problem, we must pay great attention to the use of cutting tools. We must use special tools to ensure sharp cutting. In addition, It is also necessary to do a good job of planning the cutting path, adding a second fine knife path, that is, adding the surface first, then machining the side, then machining the surface, so that there is no burr and batching, which is very useful for the workpiece that can't be polished.

五 finishing of workpieces with special shapes

For some special shape workpiece finishing, the software usually has fitting error, sometimes if the calculation error is too large, it will cause the deformation of the workpiece and affect the appearance. In order to solve this problem, we must start from the software and control the error by color theory, which will neither affect the speed of calculation nor deform the workpiece.

六 Serious errors caused by tool wear

The precision of the cutting tool directly affects the quality of the workpiece, and in the process of machining the tool wear too fast will cause the deviation of the workpiece size. The causes of tool wear include material quality, cutting process parameters, cutting oil performance and so on. If the cutting tool wear is too fast, we should stop and find out the root cause and remove it before machining. These are some points for attention in the use of CNC machine tools. Good technological environment and strict technological process are the key to improve the process level