The unit control accuracy of the CNC lathe is an unchangeable value after the NC transformation. For general CNC machining, such a modification can meet the processing needs. Due to the variety of C-type pressure spring tubes and large variations in specifications, for this type of numerical control transformation, the single unit control accuracy shows insufficient. Therefore, when the lathe is being numerically modified, the following structural methods are adopted, and the selection of multi-unit control precision can be realized. The structure of the vertical transformation and lateral transformation of the lathe is as shown.
Modification of the longitudinal part of the CNC lathe The modification of the horizontal ball screw of the CNC lathe is similar to the conventional one, and the outer roller (the driven roller body) is attached to the outermost end of the transverse ball screw, and the outer end of the transverse ball screw is X adds gear to the shaft end of the stepping motor, and fixes the X-direction stepping motor to the outer end of the middle carriage of the left side of the ball screw, and the gear of the transverse ball screw and the shaft end of the X-direction stepping motor The transition gear is added between the couplings of the gears, so that the X-direction stepping motor is used to realize the rotational movement of the lateral ball screw (outer roller).
The change of the longitudinal part of the CNC lathe is outside the carriage part of the CNC lathe. The Z-direction stepping motor is fixed by the support, the gear is added to the shaft end of the Z-direction stepping motor, and the inner roller (active roller body) and the gear are used. The shaft is connected and fixed on the support, and a transition gear is added between the inner roller and the shaft end gear of the Z-direction stepping motor, so that the Z-direction stepping motor is used to realize the rotary motion of the inner roller (active roller body).
Multi-unit control accuracy realization setting: between the X-direction stepping motor and the lathe transverse ball screw connection, increase the center distance between the two connecting gears A=(Z1+Z2)m/2=67.5mm, where: m: = 1.5, available: Z1 + Z2 = 90. This allows control of multi-unit control accuracy.
Changing the unit control precision specified by the numerical control system must cause the parameters of the internal control software in the numerical control system to be destroyed, especially when the circular path is running, which will be seriously out of control. In order to prevent the parameters of the numerical control system from being damaged, the X direction and the Z should be guaranteed. The ratio of the control precision to the unit between the coordinates is constant.
The parameters of the stepping motor used in the NC transformation are: X-direction screw pitch TX=5mm, unit control precision δX=0.005mm; Z-direction lead screw pitch TZ=12mm, unit control precision δZ=0.01mm. Unit control precision δX, The ratio K of δZ is: K=δX/δZ=0.005/0.01.
The numerical control transformation has the following advantages: the reduction of the unit control precision enables the displacement control precision of the numerical control machining to be improved, and the static torque of the stepping motor output is multiplied, when the stepping motor is in the working operation state, The increase of the torque increases the stability of the dynamic load of the machine tool, which greatly facilitates the need of rolling processing; when the stepping motor is in the stop state, the torque acts as a locking force, which is beneficial to the reliable control of the dimensional accuracy; when the gear is changed When the number of teeth is the transmission ratio i, the required unit control accuracy can be freely changed according to actual needs, and the original unit control accuracy can be restored.
In the numerical control bending forming process, taking advantage of the arbitrarily changing speed, firstly control the inner roller body to rotate rapidly for one week, drive the workpiece to basically bend and shape, and then control the inner roller body to rotate slowly for one to two weeks, and also use the delay command to make the inner roller The outer roller is stationary at the curved end of the workpiece for a few seconds to several tens of seconds to shape the workpiece and effect the shaping. CNC rolling can make the bending stress of the workpiece change slowly, which can effectively control and reduce the springback deformation of the workpiece. Because the stepping motor is affected by the characteristics of the moment frequency, the slower the running speed, the more obvious the creeping phenomenon, the greater the vibration, and the running speed should be improved in order to improve the machining accuracy. This is also the basis for changing the unit control precision to make it smaller in order to improve the running speed.
When CNC bending forming, the arc length of the workpiece bending can be arbitrarily changed. The minimum arc length change unit can be 0.005mm; the all-speed rolling speed of the inner roller and the outer roller can be arbitrarily changed. The minimum speed change unit can be 0.01mm/min; the superiority of CNC machining function can determine the optimal rolling process parameters for commissioning and provide a reliable foundation guarantee.
(Finish)
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