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Numerical controller having function to switch between pressure control and position control

A numerical control device, pressure control technology, applied in the direction of digital control, electrical program control, etc., can solve the problems of discontinuity, mold buffering mechanical impact, etc.

Inactive Publication Date: 2009-09-16
FANUC LTD
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, when switching from pressure control to position control while the axis is moving, the values ​​of the speed command when operating under pressure control and the speed command when operating under position control become discontinuous, and the result is as follows: Figure 12 as well as Figure 13 shows mechanical shocks in the die cushioning when switching from pressure control to position control

Method used

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  • Numerical controller having function to switch between pressure control and position control
  • Numerical controller having function to switch between pressure control and position control
  • Numerical controller having function to switch between pressure control and position control

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Embodiment Construction

[0025] figure 1 A numerical controller 5 for performing pressure control is shown. The numerical controller 5 obtains the pressure feedback value from the pressure sensor 4 mounted on the control object and the position feedback value from the position detector 9 that detects the rotational position of the mold cushion servo motor 8 that drives the control object, and based on these feedbacks, The value drive controls the servo motor 8 . Here, the numerical control device 5 is as referring to image 3 As will be described later, it is composed of a numerical control (NC) unit 10 and a servo control unit 20 .

[0026] figure 2 It is a figure explaining control of the die cushion device in a press machine using one embodiment of the numerical control device 5 of this invention. The numerical controller 5 such as figure 2 As shown, the drive control of the die cushioning servo motor 8 for driving the die cushioning member 6 of the die cushioning device is performed.

[0...

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Abstract

The inventio provides a numerical controller has function to switch between pressure control and position control, and comprises a numerical control unit and a servo control unit. While the servo control unit is controlling pressure, a servo position deviation amount corresponding to current actual speed of a control axis is set in the servo control unit. After the servo control unit switches to position control from pressure control, a number of pulses required for deceleration and stopping is output to an acceleration / deceleration processing unit of the numerical control unit according to an acceleration / deceleration time constant which is preset. The acceleration / deceleration processing unit outputs a moving amount for each distribution period to the servo control unit.

Description

technical field [0001] The present invention relates to a numerical controller capable of switching between pressure control and position control. Background technique [0002] In a press machine, when a sheet metal is inserted into a die by a punch shaft, die cushion control is performed to prevent sudden pressure on the sheet metal and to moderate changes in the pressure applied to the sheet metal. The die cushion device that performs this die cushion control controls the pressure using hydraulic pressure or air pressure. After the upper die (top die) installed on the punching shaft of the press machine descends and collides with the sheet metal (workpiece), the die cushioning device performs pressure control. In die cushion control using hydraulic or air pressure, it is generally difficult to achieve control that does not apply shock pressure to the sheet metal due to the shock at the start of stamping because there is a time delay from the supply of the control signal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/19B21D24/02
CPCG05B19/19B21D24/02
Inventor 菱川哲夫辻川敬介
Owner FANUC LTD
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