公开(公告)号：US06628404B1

公开(公告)日：2003-09-30

申请号：US09718293

申请日：2000-11-21

申请人： John Bruce Kelley ,  Wei-Yang Lu ,  Fred J. Zutavern

发明人： John Bruce Kelley ,  Wei-Yang Lu ,  Fred J. Zutavern

IPC分类号： G01B902

CPC分类号： H05B6/06

摘要： Disclosed is a system and method for providing closed-loop control of the heating of a workpiece by an induction heating machine, including generating an acoustic wave in the workpiece with a pulsed laser; optically measuring displacements of the surface of the workpiece in response to the acoustic wave; calculating a sub-surface material property by analyzing the measured surface displacements; creating an error signal by comparing an attribute of the calculated sub-surface material properties with a desired attribute; and reducing the error signal below an acceptable limit by adjusting, in real-time, as often as necessary, the operation of the inductive heating machine.

摘要翻译： 公开了一种用于通过感应加热机提供工件加热的闭环控制的系统和方法，包括用脉冲激光在工件中产生声波; 光学测量工件表面响应声波的位移; 通过分析测量的表面位移来计算次表面材料性质; 通过将所计算的子表面材料属性的属性与期望的属性进行比较来产生误差信号; 并且通过根据需要实时调整感应加热机的操作，将误差信号降低到可接受的极限以下。

公开(公告)号：US06566636B1

公开(公告)日：2003-05-20

申请号：US10207424

申请日：2002-07-29

申请人： Anthony E. Bentley ,  John Bruce Kelley ,  Fred J. Zutavern

发明人： Anthony E. Bentley ,  John Bruce Kelley ,  Fred J. Zutavern

IPC分类号： H05B608

CPC分类号： H05B6/06 ,  G05D23/26

摘要： A method and system for providing real-time, closed-loop control of the induction hardening process. A miniature magnetic sensor located near the outer surface of the workpiece measures changes in the surface magnetic field caused by changes in the magnetic properties of the workpiece as it heats up during induction heating (or cools down during quenching). A passive miniature magnetic sensor detects a distinct magnetic spike that appears when the saturation field, Bsat, of the workpiece has been exceeded. This distinct magnetic spike disappears when the workpiece's surface temperature exceeds its Curie temperature, due to the sudden decrease in its magnetic permeability. Alternatively, an active magnetic sensor can measure changes in the resonance response of the monitor coil when the excitation coil is linearly swept over 0-10 MHz, due to changes in the magnetic permeability and electrical resistivity of the workpiece as its temperature increases (or decreases).

摘要翻译： 一种用于提供感应淬火过程的实时，闭环控制的方法和系统。 位于工件外表面附近的小型磁传感器测量在感应加热期间加热时（或淬火期间冷却）时工件的磁特性变化引起的表面磁场变化。 被动微型磁传感器检测到超过工件的饱和场Bsat时出现的不同磁尖。 由于其导磁率的突然下降，当工件的表面温度超过其居里温度时，这种不同的磁尖消失。 或者，主动磁传感器可以测量当励磁线圈线性扫过0-10MHz时由于工件的磁导率和电阻随其温度升高而变化（或减小）时监控线圈的谐振响应的变化 ）。

公开(公告)号：US06455825B1

公开(公告)日：2002-09-24

申请号：US09718289

申请日：2000-11-21

申请人： Anthony E. Bentley ,  John Bruce Kelley ,  Fred J. Zutavern

发明人： Anthony E. Bentley ,  John Bruce Kelley ,  Fred J. Zutavern

IPC分类号： H05B608

CPC分类号： H05B6/06 ,  G05D23/26

摘要： A method of monitoring the process of induction heating a workpiece. A miniature magnetic sensor located near the outer surface of the workpiece measures changes in the surface magnetic field caused by changes in the magnetic properties of the workpiece as it heats up during induction heating (or cools down during quenching). A passive miniature magnetic sensor detects a distinct magnetic spike that appears when the saturation field, Bsat, of the workpiece has been exceeded. This distinct magnetic spike disappears when the workpiece's surface temperature exceeds its Curie temperature, due to the sudden decrease in its magnetic permeability. Alternatively, an active magnetic sensor can also be used to measure changes in the resonance response of the monitor coil when the excitation coil is linearly swept over 0-10 MHz, due to changes in the magnetic permeability and electrical resistivity of the workpiece as its temperature increases (or decreases).

摘要翻译： 一种监测感应加热工件过程的方法。 位于工件外表面附近的小型磁传感器测量在感应加热期间加热时（或淬火期间冷却）时工件的磁特性变化引起的表面磁场变化。 被动微型磁传感器检测到超过工件的饱和场Bsat时出现的不同磁尖。 由于其导磁率的突然下降，当工件的表面温度超过其居里温度时，这种不同的磁尖消失。 或者，主动磁传感器也可用于测量当激励线圈线性扫描超过0-10MHz时监测线圈的谐振响应的变化，这是由于工件的导磁率和电阻率随其温度的变化 增加（或减少）。