When processing the CNC Tours threads, due to the changes in its transmission chain, in principle, the speed can guarantee that the tool can be moved by a thread along the main supply axis ( Mainly the axis z) for a wire cycle each time the pin turns and should not be limited. However, when treating the sons of Tours CNC, they will be affected by the following aspects:
1) The PAS value (lead) of the instruction in the thread program block is equivalent to the supply speed f expressed in the quantity of power (mm / r). Speed power supply (mm / min) must be much higher than normal value;
2) At the beginning / end of its displacement, the tool will be subject to the rise of rise / drop in the servo driving system and the operating speed of the interpolation of the CNC device. The main food can be “advance” and “hysteresis” generated by movement, which does not meet the teeth to be visited so as not to meet the requirements;
3) The rotating thread must be carried out via the synchronous operating function of the spindle, that is to say that the rotating thread must have a spindle pulse generator (encoder). When the speed of the spindle is selected too high, the positioning impulses sent by the coder (that is to say a benchmark pulse signal sent by the spindle each time) may be due to “exceed” ( especially when the quality of the coder is unstable). Steps of room.
Consequently, during the turn of the wires, the determination of the speed of the spindle must follow the following principles:
1) During the effectiveness of the production and normal cut, it is advisable to choose a lower spit;
2) When the introductory length Δ1 and the cut length Δ2 (as indicated in the figure) in the thread treatment section are considerably sufficient, that is to say when the feeding distance of the wire exceeds the Length of the wire specified on the pattern, a pin with an appropriate height can be selected.
3) when the authorized working speed specified by the coder exceeds the maximum pin speed specified by the machine tool, the speed of the pin can be selected as high as possible;
4) In normal circumstances, the speed of the spindle (screw N) during the thread round must be determined as a function of the calculation formula specified in the manual of its machine tool or the CNC system, and the computing formulas are mainly:
n VIS cellsn / L (R / MIN) where n will be – the maximum operating speed authorized by the encoder (R / min);
L – The land (or lead, mm) of the part of the room.
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