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Numerical control device and numerical control method

A numerical control device and time constant technology, applied in digital control, program control, electrical program control, etc., can solve problems such as cycle time cannot be shortened

Active Publication Date: 2016-07-27
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the inertia is reduced due to cutting, etc., there is a margin to accelerate and decelerate more vigorously, but since the time constant is fixed and remains unchanged, the cycle time cannot be shortened

Method used

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  • Numerical control device and numerical control method
  • Numerical control device and numerical control method
  • Numerical control device and numerical control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a figure which shows the structure of the numerical control apparatus of Embodiment 1. The numerical control device 1 is connected to the amplifier 2 . The amplifier 2 supplies a drive current to the motor 3 . The motor 3 is connected to a load 4 that is a driving object. The motor 3 and the load 4 are referred to as the mechanical system 5 . In addition, the mechanical system 5 has one or more drive shafts (hereinafter simply referred to as "shafts") that drive the same load 4 . The motor 3 and the amplifier 2 are prepared for each axis.

[0025] The numerical control device 1 includes a program analysis unit 10 , a first interpolation unit 11 , a pre-interpolation acceleration / deceleration processing unit 12 , a second interpolation unit 13 , a parameter changing unit 14 , and a filter unit 15 .

[0026] The program analysis unit 10 analyzes the machining program 6 input from the outside, and outputs the analysis result as analysis data. The machi...

Embodiment approach 2

[0052] Image 6 It is a figure which shows the structure of the numerical control apparatus of Embodiment 2. FIG. In the description of Embodiment 2 and its subsequent descriptions, the same names and reference numerals as those of Embodiment 1 are assigned to components equivalent to those of Embodiment 1, and overlapping descriptions are omitted.

[0053] The numerical control device 1 a is connected to the amplifier 2 . The amplifier 2 supplies a drive current to the motor 3 to which the load 4 is connected. The motor 3 and the load 4 constitute a mechanical system 5 . The numerical control device 1a includes a program analysis unit 10, a first interpolation unit 11, a pre-interpolation acceleration / deceleration processing unit 12, a second interpolation unit 13, a parameter changing unit 14a, and a filter unit 15a.

[0054] The filter unit 15a is configured so that the time constant (time constant setting value) of filter processing can be changed from the outside. The...

Embodiment approach 3

[0065] Figure 8 It is a figure which shows the structure of the numerical control apparatus of Embodiment 3. FIG. The numerical control device 1b is connected to the amplifier 2 . The amplifier 2 supplies a drive current to the motor 3 to which the load 4 is connected. The motor 3 and the load 4 constitute a mechanical system 5 . The numerical control device 1 b includes a program analysis unit 10 , a first interpolation unit 11 , a pre-interpolation acceleration / deceleration processing unit 12 , a second interpolation unit 13 , a parameter changing unit 14 b , and a filter unit 15 .

[0066] In Embodiment 3, the current value output from the amplifier 2 to the motor 3 is used as the state quantity for converting the parameter. The parameter changing unit 14b converts the current value into the load value of the electric motor 3 . The load value of the motor 3 is proportional to the square of the current value. The greater the acceleration, the greater the load value bec...

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Abstract

In the present invention, a numerical control device controls a motor on the basis of a processing program that prescribes the path of an object to be driven by the motor, in order to dynamically change acceleration without executing the processing program in a trial run manner. The numerical control device is provided with a change unit that, while the motor is being controlled, changes the acceleration of the motor on the basis of an inertia ratio, an acceleration / deceleration scaling factor that can also be input from the outside, or an electric current value of the motor.

Description

technical field [0001] The invention relates to a numerical control device and a numerical control method. Background technique [0002] Currently, when machining a workpiece with a large inertia (weight) by numerical control of a machine tool, a time constant corresponding to the maximum inertia ratio is set in the numerical control device, and the time constant is not changed until the machining is completed. Therefore, when the inertia is reduced due to cutting or the like, a margin is created to enable stronger acceleration and deceleration, but since the time constant is fixed and kept constant, the cycle time cannot be shortened. Therefore, a function of selecting an optimum time constant according to the weight of the workpiece has been proposed (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 2010-211467 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2000-346738 SUMMARY OF THE INVENTION [0005] Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/416
CPCG05B19/404G05B2219/37621G05B2219/41056G05B19/402G05B19/416G05B2219/37388
Inventor 木全敏章长冈弘太朗中村直树
Owner MITSUBISHI ELECTRIC CORP