3、 Debugging skills
In order to prevent program errors and tool alignment errors, which may lead to collision accidents, we should first simulate the empty travel, and then move the tool to the right 3 times of the total length of the whole part in the coordinate system of the machine tool; then start the simulation processing, and confirm that the program and tool alignment are not available after the completion of the simulation processing In case of any error, the parts shall be processed again. After the first part is processed, self inspection shall be carried out first to confirm that it is qualified, and then full-time inspection shall be conducted. Only after the full-time inspection is confirmed to be qualified can the commissioning be completed.
4、 Experience of preventing machine tool from colliding
The impact of machine tool is a great damage to the accuracy of machine tools, and the impact on different types of machine tools is also different. Generally speaking, the impact on machine tools with weak rigidity is greater. Therefore, for high-precision CNC lathe, collision must be eliminated. As long as the operator carefully and master certain anti-collision methods, collision can be completely prevented and avoided.
The main causes of collision:
First, the diameter and length of the tool are input incorrectly;
Second, the size of the workpiece and other related geometric size input error and the initial position of the workpiece positioning error;
Third, the workpiece coordinate system of the machine tool is set incorrectly, or the zero point of the machine tool is reset in the process of processing, which results in changes. Most of the machine tool collisions occur in the process of rapid movement of the machine tool, at this time, the collision is the most harmful, which should be absolutely avoided. Therefore, the operator should pay special attention to the initial stage of executing the program and when the machine tool is changing the tool. In this case, once the program is edited incorrectly and the diameter and length of the tool are input incorrectly, it is easy to have a collision. At the end of the program, if the sequence of the tool withdrawal action of the NC axis is wrong, the collision may also occur.
In order to avoid the above-mentioned collision, the operator shall give full play to the functions of five senses when operating the machine tool, and observe whether the machine tool has any abnormal action, spark, noise, abnormal sound, vibration and burning smell. In case of any abnormality, the program shall be stopped immediately, and the machine tool can continue to work only after the problem of standby bed is solved.
5、 Finish machining parts
After the completion of the first piece of trial cutting, the parts shall be produced in batches, but the qualification of the first piece does not mean that the whole batch of parts will be qualified, because in the process of processing, due to the different processing materials, the tool will wear, the processing materials are soft, the tool wear is small, the processing materials are hard, and the tool wear is fast, so in the process of processing, it is necessary to frequently check, increase and reduce the tool compensation value in time, Ensure the parts are qualified.
Take a part as an example, the processing material is k414, and the total processing length is 180mm. Because the material is very hard, the tool wear is very fast in the processing. From the starting point to the end point, the tool wear will produce a slight degree of 10 € € € € 20mm. Therefore, we must artificially add a slight degree of 10 € € € € € € 20mm in the program, so as to ensure that the part is qualified.
In a word, the basic principle of machining: first rough machining, remove the redundant materials of the workpiece, and then finish machining; during machining, avoid the occurrence of vibration; avoid the thermal denaturation of the workpiece during machining, which may be caused by many reasons, such as excessive load; it may be caused by the resonance of the machine tool and the workpiece, or it may be caused by the lack of rigidity of the machine tool, or it may be caused by the passivation of the cutter, We can reduce the vibration by the following methods: reduce the cross feed and machining depth, check whether the workpiece is firmly clamped, increase the rotation speed of the tool, and reduce the resonance by reducing the rotation speed, in addition, check whether it is necessary to replace the new tool.
Mastering the operation skills of CNC machine tools is a step-by-step process, which can not be achieved overnight. It is based on mastering the basic operation of machine tools, basic machining knowledge and basic programming knowledge. The operation skills of CNC machine tools are not unchangeable either. It is an organic combination that needs to give full play to the imagination and hands-on ability according to the actual needs of customers, and it is innovative labor.
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