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Factors affecting the accuracy of china vertical turret milling

• Posted by laveseo laveseo Jul 3 - Filed in Recreation - 518 views

  It is said that fast wire can reach 0.02mm, slow wire can reach 0.005mm, I do not know what is a concept? Can this accuracy be achieved in any size within the working stroke of the machine? People who understand tolerances know that under the condition of the same accuracy, the tolerance range of 100mm and 200mm dimensions is different. So what determines the accuracy of wire cutting?

  Nowadays, the alignment principle of wire cutting is electric contact type. That is to add a 12V, 10mA power supply between the wire and the workpiece. At this time, if the wire and the workpiece are open, the two ends are 12V voltage, if the wire and the workpiece contact and short circuit, the two ends are OV, of course, there will be a state of a certain resistance value. The voltage between the wire and the workpiece is detected, amplified to obtain a "1" or "0" decision signal, so as to start or stop the counter that drives and records the coordinate movement, accumulate the total amount and make a return 1/2 processing, and the process of alignment is completed.

  However, the reliability and repeatability of the voltage signal of the moment of mechanical contact between the wire and the workpiece has become the key to the start-stop counter. If the setting is too sensitive, the probability of false action will be increased. If the setting is too slow, the hysteresis phenomenon will occur. In addition, because it is the signal intake based on the electrical contact between the lead screw and the workpiece, the conductive state of the surface of the wire and the workpiece, the oxide film on the surface of the workpiece or other dirt, will make the electrical contact signal out of alignment. If the surface oxidation of aluminum is very fast or other materials with low electrical conductivity, the contact signal is even more false.

  The key point of centering operation is that the silk should have sufficient tension and position stability; The surface of the workpiece should be very clean and burr free; To repeat the alignment of more than three times, eliminate the obvious reasons for the false data, and then the other data average.

  According to the test of many times and many machine tools, the accuracy of centering function can be achieved in about 0.05, which is similar to the accuracy of artificial spark centering. After the relevant factors affecting the alignment accuracy are clear, it seems that there is a clear judgment whether to use automatic alignment or not, and how to choose the result of automatic alignment.

  Silk can not walk up, it will make a difference to the results in the pair, who should be taken who should be treated concretely.

  So far, there is no better way to capture the centering signal, and the precision of imported slow walking wire centering is slightly better, because the silk is thicker, the tension is larger, the precision is higher, and the result of repeated intelligent processing several times.

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