Speaking of the master of the machining center, the first impression is the image of a versatile master who can independently program, set the tool by himself, debug by himself, clamp independently and complete the parts processing. In fact, it is the same in any industry. To become a master who can handle things on his own requires a gradual and gradual process, and it cannot be achieved overnight. As far as the operation of the CNC machining center is concerned, there are many methods and techniques that can really make us get twice the result with half the effort.

1. Programming skills

The product precision requirements of the CNC machining center are very high. When programming, two levels of problems must be fully considered. One is the processing sequence, and the other is the parameters, such as speed, feed rate, and cutting depth.

The processing sequence is generally: drilling first, then flattening. This can prevent shrinkage during drilling; rough processing first, then fine processing; processing large tolerances first and small tolerances last.

Based on the hardness of the material, we then select the appropriate speed, feed rate and cutting depth: for carbon steel, we select high speed, high feed rate and large cutting depth. For cemented carbide, we select low speed, low feed rate and small cutting depth. For titanium alloy, we select low speed, high feed rate and small cutting depth.

Second, direct tool setting skills

First, select the center of the right end face of the part as the tool setting point and set it as the zero point. After the machine tool returns to the origin, each tool that needs to be used will be set with the center of the right end face of the part as the zero point; when the tool touches the right end face, enter Z0 and click measure, and the tool compensation value of the tool will automatically record the measured value, which means that the Z-axis tool setting is well aligned. The X-axis tool setting is a trial cut. Use the tool to turn the outer circle of the part less, measure the value of the outer circle to be turned (such as x is 20mm), enter x20, click measure, and the tool compensation value will automatically record the measured value. At this time, the x-axis is also aligned;

This direct tool setting method, even if the machining center is powered off, will not change the tool setting value after it is restarted. It can be used for large-scale and long-term production of the same part, and there is no need to re-set the tool during the equipment shutdown.

3. Debugging skills

After the parts are programmed and the tool is aligned, trial cutting and debugging are required to prevent errors in the program and tool setting, which may cause collision accidents.

We should first simulate the empty stroke, and move the tool to the right in the coordinate system of the machining center by 2-3 times the total length of the part; then start the simulation processing, and after the simulation processing is completed, confirm that the program and tool setting are correct, and then start processing the parts. After the first part is processed, self-check it first, confirm that it is qualified, and then find a full-time inspector to check it. After the full-time inspector confirms that it is qualified, it means that the debugging is over.

4. Tips to prevent tool collision

The collision of the tool in the machining center is a great damage to the accuracy of the equipment, and the impact on different types of machine tools is also different. Generally speaking, it has a greater impact on machine tools with weak rigidity. Therefore, for high-precision machining centers, collisions must be avoided. As long as the operator is careful and masters certain anti-collision methods, collisions can be completely prevented and avoided. There are only three reasons for tool collisions: one is the wrong input of the diameter and length of the tool; the second is the wrong input of the size of the workpiece and other related geometric dimensions and the initial position positioning error of the workpiece; the third is the wrong setting of the workpiece coordinate system of the machining center, or the machine tool zero point is reset during the machining process, which causes changes. Machine tool collisions mostly occur during the rapid movement of the machine tool. The harm of the collision at this time is also the greatest and should be absolutely avoided.

In order to avoid the above collisions, the operator should give full play to the functions of the five senses when operating the machine tool. Observe whether the machine tool has abnormal movements, sparks, noise and abnormal sounds, vibrations, and burnt smells. If an abnormal situation is found, the program should be stopped immediately, and the machine tool can continue to work after the problem is solved.

The operation of the CNC machining center is based on mastering the basic operation of the machine tool, basic mechanical processing knowledge and basic programming knowledge. The operation skills of CNC machine tools are not static. It is an organic combination of the operator's imagination and hands-on ability, and it is innovative labor.