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High-frequency hardening monitor device

A technology of high-frequency quenching and monitoring devices, which is applied in the direction of induction heating devices, energy efficiency, process efficiency, etc., and can solve the problems of low effective power and inability to monitor the effective power, frequency, and phase difference changes of high-frequency quenching treatment. , to achieve the effect of quality assurance

Active Publication Date: 2010-08-11
NETUREN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the effective power obtained by measuring Vcoil and Icoil and multiplying these values ​​by the operation circuit is small
In addition, the calculation circuit is easily affected by temperature drift, frequency, and phase difference fluctuations. Therefore, it is currently impossible to monitor the effective power of the induction hardening process with high accuracy based on the calculated value of the calculation circuit.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0052] The induction hardening monitoring device according to the first embodiment ensures the quality of induction hardening by monitoring the output current from the high-frequency inverter and the voltage generated across the heating coil. figure 1 It is a figure which shows the structure of the induction hardening system equipped with the induction hardening monitoring apparatus which concerns on 1st Embodiment. The induction hardening system 1 is composed of an induction hardening device 10 and an induction hardening monitoring device 20 .

[0053] The high-frequency quenching device 10 is composed of the following parts on the circuit: a high-frequency inverter 11; a capacitor 12 for matching, which is connected between the output terminals of the high-frequency inverter 11; induction heating; and a current transformer 13 which exists between the capacitor 12 for matching and the heating coil 14 . Accordingly, the induction hardening device 10 is constituted as a reson...

no. 2 approach

[0080] In the second embodiment, during induction hardening, the normality of the induction hardening process is monitored by monitoring the value obtained by dividing the heating coil voltage by the output current output from the high-frequency inverter, that is, the load impedance. The configuration of the induction hardening system equipped with the quenching monitoring device according to the second embodiment is the same as that shown in the first embodiment. figure 1 The situation is the same. That is, the induction hardening system equipped with the induction hardening monitoring device according to the second embodiment, specifically, the impedance monitoring device is installed, such as figure 1 As shown, it consists of an induction hardening device 10 and a quenching monitoring device 20 .

[0081] Such as figure 1As shown, the induction hardening device 10 is constituted as a resonant circuit in which a capacitor 12 for matching and a heating coil 14 are connec...

Embodiment 1

[0128] use figure 1 The shown induction hardening system 1 was subjected to a load evaluation test.

[0129] As the high-frequency inverter 11 , an inverter that outputs a high frequency with a frequency of 25 kHz by performing constant control with a DC voltage is used. As a parallel resonance type load circuit, a matching capacitor 12 of 10 μF and a current transformer 13 with a turn ratio of 6:1 were used. As the saddle-shaped support part which built the heating coil 14 and supported the workpiece|work 15, the support part with an inner diameter of 40 mm and a width of 4 mm was used. A round pipe with an outer shape of 33 mm and a wall thickness of 5.5 mm was used as the workpiece 15 . In Example 1, the workpiece 15 was arranged so that the gap between the outer shape of the workpiece and the end surface of the saddle-shaped support portion was a standard value of 4 mm. The output of the high-frequency inverter 11 is set so that the output power of the high-frequency i...

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Abstract

Provided is a high-frequency hardening monitor device (20) comprising a current sensor (21) for detecting the output current of a high-frequency inverter (11), a voltage sensor (22) for detecting the voltage at a heating coil (15) connected in an equivalent circuit manner together with a condenser (12) between the output terminals of the high-frequency inverter (11), and a control unit (23) for performing a hardening administration on the basis of the detected signal of the current sensor (21) and the detected signal of the voltage sensor (22). The control unit (23) calculates the effective value of the output current from the high-frequency inverter (11) on the basis of the detected signal from the current sensor (21), and calculates the effective value of the voltage to establish in a heating coil (15), on the basis of the detected signal from the voltage sensor (22), or calculates a load impedance from the individual effective values, thereby to monitor the hardening.

Description

technical field [0001] The present invention relates to an induction hardening monitoring device for monitoring whether induction hardening (Hardening) treatment of a workpiece is properly performed. Background technique [0002] In order to improve the physical properties of the workpiece such as hardness, the workpiece is quenched using high-frequency power. Figure 24 It is an external view schematically showing the state of normal quenching treatment. For example, as shown in the figure, the workpiece 50 to be heated has a rod-shaped base 51 coaxially provided with a bulging portion 52 , and therefore has a substantially L-shaped cross section due to the rod-shaped base 51 and the bulging portion 52 . The heating coil 61 is a saddle coil, and the heating coil 61 is formed by connecting a pair of linear portions 61b, 61b to both ends of the semicircumferential portion 61a. When performing quenching, first, the workpiece 50 is held on a holding unit not shown, with the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/10H05B6/06H05B6/10
CPCC21D1/42C21D11/00C21D1/10Y02P10/25
Inventor 杨跃生田文昭北村太一
Owner NETUREN CO LTD
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