CNC Knowledge: CNC crash machine! Watch three times and stop once to avoid this

From the perspective of processing operation flow, CNC machine tool processing can be divided into three main modules: programming, tool setting and automatic processing. Among them, tool programming and adjustment are preparatory tasks for machining operations. Whether the programming is correct, the selected cutting amount is reasonable, and the input of tool setting parameters is accurate will be reflected in the actual processing.

Therefore, in order to ensure the accuracy of CNC machine tool processing operations, trial processing is usually carried out to check whether there are any problems with the automatic processing of CNC machine tools. During trial processing, strictly following the processing guidelines of “three looks, two things and one stop” can greatly reduce collision problems during machine tool operation.

1

Look three times

Drilling is possible if the radius is greater than 4 times the drill diameter and the hole is perpendicular to the radius. Reduce the feed to 50% of normal feed while drilling.

Take a look at the program

All operations of CNC machine tools are controlled by program instructions. By checking the instructions and program names, you can find out existing problems and correct them in time. When checking the program, in order to avoid repeated checks or missed checks, a certain check sequence must be followed: First, start with the name of the program. Since performing basic CNC operations requires a large number of program instructions for control, it will. also be stored inside the microcontroller system. For a large number of program files, call up the program name in automatic mode. Pay special attention to checking the program name suffix and program format. Second, check the program fragments. Use the form of simulation software to detect whether there are errors in specific program instructions. If there are problems with the upper and lower logic of the instruction writing, the simulation software will automatically flag existing problems so that programmers can modify the program. in a timely manner until the operating program is no longer in question.

Second, look at the coordinates of the room

The screen will display detailed information such as machine tool coordinates and workpiece coordinates of the current tool. When checking, pay attention to comparing the screen values ​​with the actual position of the tool tip to ensure that the coordinate values ​​between the two can match one to one. Due to the influence of factors such as machine tool fixtures and tool wear, the workpiece coordinates often have certain errors. If the error exceeds the standard range, it will affect the processing progress of the machine tool and cause collision problems. Therefore, this problem can be effectively avoided by comparing the coordinates of the part.

Third, look at the position of the knife tip

The processing and cutting operations of CNC machine tools are supplemented by cutting tools. Therefore, when inspecting machine tools, you should focus on checking the position of the tool tip. The tip of the tool will wear out after being used for a while. Without affecting the processing quality of the machine tool, the machine tool operator should regularly adjust the tool position to prevent the tool from colliding with the workpiece or chuck. Additionally, the actual position of the tool tip must be compared with the data displayed on the screen. If there is a significant error between the two values, the processing operation must be stopped, the tool must be left after stopping the machine. and reinstalled and adjusted.

2

Second important

First, single-step execution

CNC machine tools all have a single-segment SBL execution function. After enabling this function, the microcontroller will automatically complete the processing operation every time it completes a control program. The operator of the CNC machine tool must manually start the following program before the processing operation. can be achieved. The advantage of single-step execution is that it gives the operator sufficient inspection time, including tool inspection, coordinate inspection and program inspection, thereby greatly avoiding the occurrence of collision accidents. Although single-step execution reduces the processing efficiency of CNC machine tools, it can greatly improve the processing quality and avoid collision problems. In comparison, its overall treatment effect is better.

Second, low magnification

By adjusting the speed adjustment knob of the CNC machine tool to reduce the tool feed speed, you can observe whether the position of the tool tip is consistent with the coordinate display value before the tool processes the part. equal, you can stop the equipment in time to avoid collision problems. Especially when machining the inner hole of the workpiece, it is easy to make mistakes when inserting or retracting the tool, which not only affects the processing quality of the inner hole, but also causes serious deviations in the size of the inner hole of the part. , and can also cause problems such as knife jamming and tool collision. Therefore, choosing a low magnification processing speed can effectively avoid the above processing problems.

3

A stop

To be precise, there should be several pauses during automatic processing. By pausing, the operator can have enough mental preparation to observe and compare the position of the tool tip and the coordinate display on the screen. Especially when the chips are wrapped around the workpiece or tool, the operator can press the cycle stop key and use this time to resolve. the problem of CNC machine tools. Problems that arise during processing can avoid errors caused by panic during operation.