Numerical control device and control method
A numerical control device and control unit technology, applied in digital control, program control, electrical program control, etc., can solve the problems of ineffective use of motor output torque, output torque reduction, etc.
Active Publication Date: 2021-03-26
BROTHER KOGYO KK
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Problems solved by technology
Therefore, the acceleration / deceleration control unit needs to reduce the output torque on the low speed side (refer to Figure 8 Middle dotted line), so there is a problem that the output torque of the motor cannot be effectively used
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Embodiment Construction
[0018] Embodiments of the present invention will be described. figure 1 The numerical controller 20 shown controls the movement of the axes of the machine tool 10 to process a cutting material (not shown) held on the upper surface of a table (not shown). The left-right direction, front-rear direction, and up-down direction of the machine tool 10 are the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively.
[0019] refer to figure 1 Next, the structure of the machine tool 10 will be described. The machine tool 10 is a vertical machine tool whose main shaft extends in the Z-axis direction. The machine tool 10 moves a spindle on which a tool is attached in each of the X, Y, and Z axis directions to process a cutting material held on the upper surface of a table. The machine tool 10 includes a spindle mechanism, a spindle moving mechanism, a tool changing device (not shown), and the like. The spindle mechanism includes a spindle motor 12 for rotati...
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PROBLEM TO BE SOLVED: To provide a numerical control device capable of effectively utilizing output torque of a servomotor, and a control method thereof.SOLUTION: A numerical control device performs specific acceleration deceleration control for a feeding shaft driven by a motor. The specific acceleration deceleration control includes an acceleration increase period T1, a first constant acceleration period T2, and an acceleration decrease period T6. A time constant t1 of the acceleration increase period T1 is smaller than a time constant t2 of the acceleration decrease period T6. Accordingly, the numerical control device can effectively utilize the maximum output torque of the motor at lower rotation speed side. The specific acceleration deceleration control includes a second constant acceleration period T2 during the acceleration decrease period T6 except the start and end of the acceleration decrease period T6. Accordingly, since the numerical control device can decrease the output torque in a step by step manner during the acceleration decrease period T6, the numerical control device can approximate the output torque so as not to exceed the maximum output torque in a higher rotation speed area where the decrease tendency of the acceleration is not constant. Consequently, the numerical control device can effectively utilize the output torque of the motor.SELECTED DRAWING: Figure 3
Description
technical field [0001] The invention relates to a numerical control device and a control method. Background technique [0002] The machine tool has an electric motor and a feed axis. The feed shaft is driven by an electric motor. The numerical control device controls the acceleration and deceleration of the feed axis. There is a proportional relationship between the acceleration and the torque of the motor. The motor has a maximum output torque characteristic based on the rated value. It is desirable that the output torque of the electric motor is controlled within the region of the maximum output torque characteristic. The numerical controller disclosed in Japanese Patent No. 5233592 includes an acceleration / deceleration control unit. The acceleration and deceleration control unit performs two-stage acceleration and deceleration control on the feed shaft so that the output torque of the motor approximates the maximum output torque characteristic of the motor, so that t...
Claims
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IPC IPC(8): G05B19/416
CPCG05B19/4163G05B2219/36521
Inventor 久留美贤祐
Owner BROTHER KOGYO KK