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Ten years experience of master of machining center: skills and experience of machine operation

Speaking of the master of the machining center, the first impression is that he is a versatile master with unique programming, tool setting, debugging, clamping and parts processing. In fact, any industry is the same. To become a master in charge of one's own affairs, what is needed is a process of accumulation over time and step by step, which can not be achieved overnight. As far as the operation of CNC machining center is concerned, there are many methods and skills that can make us get twice the result with half the effort

1、 Programming skills

The CNC machining center requires high product precision. Two aspects should be fully considered in programming, one is machining sequence, the other is parameters, such as speed, feed, cutting depth.

The processing sequence is: drilling first, then flat end. This can prevent material shrinkage when drilling; first rough machining, then fine processing; first processing tolerance is large, finally processing tolerance is small.

According to the hardness of the material, we choose reasonable speed, feed rate and cutting depth: carbon steel materials choose high speed, high feed rate and large cutting depth. Low speed, low feed rate and small cutting depth are selected for cemented carbide. Low speed, high feed rate and small cutting depth are selected for titanium alloy.

2、 Direct knife setting skills

Firstly, 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 original point, each tool that needs to be used is set with the center of the right end face of the part as the zero point. When the tool contacts the right end face, input Z0 and click measurement, the measured value will be automatically recorded in the tool compensation value, which indicates that the z-axis tool setting is good, and the x-axis tool setting is the trial cutting tool setting, and the tool is used to turn the outer circle of the part Less, input X20 to measure the external circle value of the vehicle (for example, X is 20 mm), click measure, the cutter compensation value will automatically record the measured value, and then the x-axis is aligned;

This direct tool setting method can be applied to mass production of the same part for a long time, even if the machining center is powered off, and the tool setting value will not be changed after the machine is powered off again. It can be applied to mass production of the same part for a long time, and there is no need to re adjust the tool when the equipment is shut down.

3、 Debugging skills

After the parts are programmed, the trial cutting and debugging should be carried out after the cutter is adjusted. In order to prevent the program error and the error of tool setting, the machine collision accident will be caused.

We should first carry out the simulation processing of empty stroke. In the coordinate system of the machining center, the cutter should be moved to the right by 2-3 times of the total length of the parts. Then, the simulation processing should be started. After the simulation processing is completed, the program and tool setting are confirmed to be correct, and then the parts are processed. After the first part is processed, the self inspection is carried out, and then the full-time inspector is asked to check and inspect Only after the personnel confirm that it is qualified can the commissioning be finished.

4、 Skills of preventing knife collision

The tool impact of machining center has 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 great influence on the machine tool with low rigidity. Therefore, for high-precision machining centers, collision must be eliminated. As long as the operator is careful and master certain anti-collision methods, collision can be completely prevented and avoided, There are only three reasons for the tool collision: first, the input error of the tool diameter and length; second, the input error of the workpiece size and other related geometric dimensions and the initial position positioning error of the workpiece; third, the workpiece coordinate system of the machining center is set incorrectly, or the zero point of the machine tool is reset in the process of machining, and the machine tool collision mostly occurs in the rapid movement of the machine tool In the dynamic process, the collision at this time is also the most harmful and should be avoided absolutely.

In order to avoid the above-mentioned collision, the operator should give full play to the function of five senses when operating the machine tool. Check whether there is abnormal vibration and vibration of the machine tool. If any 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 CNC machining center is based on mastering the basic operation of machine tool, basic machining knowledge and basic programming knowledge. The operation skills of CNC machine tools are not immutable. It is an organic combination of the operator's imagination and hands-on ability. It is an innovative labor.