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Numerical control device and numerical control method

A technology of numerical control device and target position, applied in the direction of digital control, program control, electrical program control, etc., can solve the problem that the cycle time cannot be shortened

Active Publication Date: 2018-11-13
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

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a figure which shows the structure of the numerical control device of Embodiment 1. The numerical control device 1 is connected with the amplifier 2 . Amplifier 2 supplies drive current to motor 3 . The motor 3 is connected to a load 4 to be driven. The motor 3 and the load 4 are referred to as a mechanical system 5 . Furthermore, 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 has a program analyzing 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 machining program 6 is constituted...

Embodiment approach 2

[0052] Figure 6 It is a figure which shows the structure of the numerical control device of Embodiment 2. In the second and subsequent descriptions of Embodiment 2, constituent elements equivalent to those of Embodiment 1 are given the same names and symbols as in Embodiment 1, and redundant descriptions are omitted.

[0053] The numerical control device 1 a is connected to an amplifier 2 . Amplifier 2 supplies drive current to motor 3 to which load 4 is connected. The motor 3 and the load 4 constitute a mechanical system 5 . The numerical control device 1 a has a program analyzing 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 a, and a filter unit 15 a.

[0054] The filter unit 15a is configured such that the time constant (time constant setting value) of the filter processing can be changed from the outside. The parameter changing unit 14a can chan...

Embodiment approach 3

[0065] Figure 8 It is a figure which shows the structure of the numerical control device of Embodiment 3. The numerical control device 1b is connected to the amplifier 2 . Amplifier 2 supplies drive current to motor 3 to which load 4 is connected. The motor 3 and the load 4 constitute a mechanical system 5 . The numerical control device 1 b has a program analyzing 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 parameters. The parameter changing unit 14b converts the current value into a load value of the 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 becomes. In addition, the larger the i...

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Abstract

To dynamically change the acceleration without trial executions of a machining program, a numerical control device, which controls a motor on the basis of a machining program that specifies a path for a drive target of the motor, includes a changing unit that changes the acceleration of the motor under the control of the motor on the basis of the inertia ratio, the acceleration-deceleration factor that can be externally input, or the 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] Conventionally, when a machine tool is numerically controlled and a workpiece with a large inertia (weight) is machined, a time constant corresponding to the maximum inertia ratio is set in the numerical control device, and the time constant is not changed until machining is completed. Therefore, when the inertia is reduced by cutting or the like, there is a margin for more powerful acceleration and deceleration. However, since the time constant is fixed and remains unchanged, the cycle time cannot be shortened. Therefore, a function of selecting an optimal time constant according to the weight of the workpiece has been proposed (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2010-211467 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2000-346738 Contents of the...

Claims

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Application Information

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Patent Type & Authority Patents(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