Full Analysis of the Causes of Tool Collision in CNC Machining Center

In the field of machine tool processing, the problem of tool collision is a big headache. It seems like a small thing to hit a knife with equipment, but it is actually a huge hazard. As an automatic precision equipment with high speed and high precision, the machining center will affect the machining efficiency in case of tool collision, and the overall accuracy of the machining center will be reduced in case of heavy impact, and even the entire tool magazine will become a waste. Therefore, in our daily processing, we must pay attention to the problem of tool collision. Understanding the causes of knife collision and taking precautions in advance are effective ways to reduce the occurrence of knife collision.

01 Operator human error

According to the data statistics of the production line, most of the causes of tool collision in the machining center are caused by the operator's operation error. For example, in the process of tool setting, the speed of the machine tool drive shaft is too fast, resulting in tool collision; For example, the coordinate value of the machine tool axis is entered incorrectly, resulting in tool collision during the spindle machining process, which is the reason for the most tool collision in the machining center.

Therefore, improving the professional quality and sense of responsibility of the operators of the machining center is the best way to prevent the machining center from hitting the knife, especially the sense of responsibility of the operators of the machining center, which is an absolute culprit.

In fact, the operator's professional quality can be cultivated, because there are only a few commands and data back and forth. Anyone with relevant professional knowledge can master this skill in a short time, but the operator's sense of responsibility is difficult to regulate.

Even many people, including the managers of the production line, believe that it is inevitable for the operators of the machining center to collide with the knife. It would be better if they collide more times. If they have experience, they will not collide. What kind of logic is this? It's nonsense.

In fact, the damage to the machine tool caused by the tool collision of the machining center is very serious, especially the damage to the machining accuracy of the machine tool, which is basically irreversible. Especially for some high-precision machine tools, after several times of collision, the accuracy is basically lost. On the surface, there seems to be no big change, but in fact, the accuracy of the machine tool is no longer there.

Therefore, we must try to avoid the collision of machine tools with knives. There is no big difference between the collision of machine tools and driving against walls. For mechanical equipment, it is suicidal behavior.

02 Workpiece clamping failure

The second reason for tool collision is that the clamping of the workpiece is invalid. For example, the workpiece is loose during processing, and the part will move under the cutting force of the tool. At this time, it is easy to cause tool collision, and it is also easy to cause dangerous accidents such as the workpiece throwing out of the fixture, even breaking the window glass of the machine tool.

In addition, for many automatic machining production lines, there may be clamping errors caused by inaccurate positioning of parts. For example, when the manipulator places the parts on the fixture, the position of the parts is deviated, which leads to the parts not being clamped in place. If there is no corresponding workpiece in place detection switch, the tool may collide during the process of cutting.

And because the automatic production line is fully automatic processing, the operator is not involved in the processing of the machine tool, so it is difficult to find the problems caused by clamping, which further increases the probability of tool collision. If you do not want to be engaged in the operation of the machining center all the time, you can add a small editor QQ: 770573829 to learn UG NC programming!

At the same time, during the machining process of the machine tool, the wear and damage of the tool is also easy to cause the tool collision of the machine tool. For example, the tool suddenly collapses or breaks, which causes the tool to lose the cutting force, but the feed of the machine tool does not stop. At this time, it is easy to cause the tool collision. Therefore, it is necessary to monitor the load of the feed direction of the machine tool in real time. If there is any abnormality, it is necessary to be able to actively stop the machine, Only in this way can the damage to the machine tool caused by the knife collision be minimized.

03 Machine tool movement fault

The so-called machine tool fault means that the operating system of the machine tool is out of control. For example, when the machine tool executes a processing program, its processing path does not follow the path of the processing program, but there is a large deviation. At this time, the machine tool will collide with the tool. Moreover, this kind of tool collision is very scary. Suddenly, I found that the cutting of the machine tool was abnormal. I once encountered it once. During the processing, a 20 mm end milling cutter was buried in the past, with sparks splashing and abnormal noise.

Later, it was detected that there was a problem with a certain motion module of the control system of the machine tool. Of course, this situation is relatively rare, but there are many such excuses. Many operators use this reason as their excuse for tool collision after their own operation mistakes, in an attempt to escape responsibility and punishment, and the reason is also difficult to find.

In particular, some CNC systems in China do have some instability, which may occur once or twice a year, but it gives many people the excuse of "hitting porcelain",

Therefore, the orderly, timely and professional operation and maintenance of the processing equipment is very important. Do not overload the processing equipment, otherwise it will be more than worth the loss.

04 Intentional knife collision

People are dangerous, especially in the workplace. Many times, in order to avoid small responsibilities and punishment, they do not hesitate to create bigger things to cover up, and they often succeed. For example, if the qualified rate of a certain operator's product processing exceeds the standard, it is necessary for the enterprise to punish the operator, but the operator is not willing to be punished, they will want to recruit outside to cover up the unqualified products processed by themselves by using the accident of tool collision, thus reducing their unqualified rate and achieving the purpose of avoiding the penalty.

This kind of thing is not without it. It's just that people who play this operation need to be more bold and careful. But I've really met it before, and now I think it's incredible.