Machine tool workpiece demagnetization control device and method

A control device and demagnetization technology, which is applied in the field of demagnetization, can solve the problems of reduced efficiency and duty cycle, and achieve the effects of reducing the risk of component damage, improving demagnetization efficiency, and reducing the difficulty of equipment operation and setting

Inactive Publication Date: 2015-02-04
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the figure, the duty cycle keeps decreasing until the current decays to close to zero, so each freewheeling time is getting shorter and shorter, but each freewheeling time is Td, resulting in a great reduction in efficiency

Method used

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  • Machine tool workpiece demagnetization control device and method
  • Machine tool workpiece demagnetization control device and method
  • Machine tool workpiece demagnetization control device and method

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0017] The present invention is further illustrated by taking the electromagnetic chuck controller of a grinder as an example. The invention introduces parameter identification technology and DC / DC conversion technology into the design of electromagnetic chuck controller, such as figure 2 As shown, the power supply input terminal and the power supply output terminal are included. The power supply input terminal is electrically connected to the voltage transformation rectification and voltage stabilization circuit. The output terminal of the voltage transformation rectification and voltage stabilization circuit outputs a DC voltage to the H-bridge inverter circuit through the DC / DC conversion circuit. It also includes a control loop composed of a digital signal processor; the control loop collects the information of the excitation coil through the AD ...

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Abstract

The invention discloses a machine tool workpiece demagnetization control device and method. Demagnetization voltages with alternatively changed polarities of PWM (Pulse Width Modulation) wave forms are applied to two ends of a magnetic exciting coil of a device to be demagnetized, wherein the demagnetization voltages are applied to the magnetic exciting coil through an H bridge inverter circuit, a direct current voltage required by the H bridge inverter circuit is generated by a DC / DC Boost circuit; a pseudo-random binary sequence signal required by a parameter identification applied to the magnetic exciting coil is generated by a digital signal processor, a current in the magnetic exciting coil is sampled by using AD, then an equivalent time constant of the magnetic exciting coil is identified by adopting a correlation analysis method; and the polarity of the PWM wave is changed through the H bridge inverter circuit every 3-5 times of time constants. According to the invention, the moment of changing the polarity of the demagnetization voltages applied to two ends of the magnetic exciting coil is automatically determined, and the demagnetization efficiency is greatly increased. Meanwhile, the invention can adapt to various demagnetization devices; and the equipment operation and adjustment difficulty is lowered.

Description

Technical field [0001] The invention relates to the field of demagnetization, in particular to a demagnetization control device for a machine tool workpiece and a demagnetization method thereof. Background technique [0002] In the machining process, magnetizing and demagnetizing the electromagnetic chuck holding the workpiece to be processed is an auxiliary processing link that is often encountered. Take the surface grinder as an example. This equipment is a kind of equipment that uses an electromagnetic chuck to absorb the workpiece, and the surface of the workpiece is ground by a grinding wheel. The working principle of the electromagnetic chuck is the famous Ampere's law of total current in the electromagnetic field theory: ∫Hdl=??Jds+??D / ??t. When the electromagnetic chuck is needed to absorb the workpiece to be processed, an excitation voltage can be applied to both ends of the excitation coil of the electromagnetic chuck to generate an excitation current, thereby generati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/42
Inventor 孙向文陈乃明刘勇张春阳王志强蔡广军赵海霞
Owner HENAN UNIV OF SCI & TECH
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