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    • 1. 发明授权
    • Apparatus and method for thermal displacement correction for a machine tool
    • 机床热位移修正装置及方法
    • US06456896B1
    • 2002-09-24
    • US09101022
    • 1998-06-29
    • Susumu ItoMasao KamiguchiHisao IshiiMasanobu TakemotoSusumu MaekawaKunio Kojima
    • Susumu ItoMasao KamiguchiHisao IshiiMasanobu TakemotoSusumu MaekawaKunio Kojima
    • G06F1900
    • G05B19/404B23Q3/15534
    • The position of a feed shaft is monitored, the mean moving speed and moving frequency of the feed shaft are measured with every unit time for position correction, and a correction amount &dgr;n is determined from the speed and frequency according to an approximation formula and updated (c7 and c8). A position correction amount for a commanded position is determined from this correction amount, and the commanded position is corrected by the position correction amount (c1 to c6). The position correction amount for the commanded position is determined from this correction amount, and the commanded position is corrected by this position correction amount. Since the correction amount is determined according to the approximation formula, thermal displacement correction can be effected at all times without requiring any sensor. When the correction amount changes substantially (c10), the thermal displacement is measured by means of a sensor and used as the correction amount (c11 and c12), whereby accuracy is improved. The frequency of measurement by means of sensors is reduced, so that the machining time can be reduced.
    • 监视进给轴的位置,每单位时间测量进给轴的平均移动速度和移动频率以进行位置校正,并根据近似公式从速度和频率确定校正量deltan,并更新( c7和c8)。 根据该修正量确定指示位置的位置校正量,并且通过位置校正量(c1〜c6)校正指令位置。 根据该修正量确定指令位置的位置校正量,并且通过该位置校正量校正指令位置。 由于根据近似公式确定校正量,所以可以始终进行热位移校正,而不需要任何传感器。 当校正量基本上变化(c10)时,通过传感器测量热位移并将其用作校正量(c11和c12),从而提高精度。 通过传感器测量的频率降低,从而可以减少加工时间。
    • 4. 发明申请
    • Machine tool
    • US20060247888A1
    • 2006-11-02
    • US11404858
    • 2006-04-17
    • Kunio KojimaSusumu Maekawa
    • Kunio KojimaSusumu Maekawa
    • G01K3/00
    • G05B19/404B23Q11/0007B23Q17/22G05B2219/37285G05B2219/42281G05B2219/49214
    • A machine tool capable of detecting an ambient temperature change without a detector for detecting the ambient temperature and capable of detecting an abnormality of a temperature detector for detecting the motor temperature. Motor temperature Ti (i=1, 2 . . . n) and the current feedback Ifi of each motor are read out from the temperature detector for detecting the temperature of each motor of the machine tool. The heating value Qi of each motor is obtained from current feedback Ifi. Motor temperature Ti is calculated and estimated from the heating value Q. Difference ΔTi between the estimated motor temperature Tmi and the detected temperature Tsi is obtained. When difference between maximum and minimum values of difference ΔTi exceeds the first threshold value β, a temperature detector abnormality is outputted. When it is equal to or less than the first threshold value β, the mean value ΔT′ of differences is obtained. If the mean value ΔT′ is equal to or less than the second threshold value γ, it is determined that there is no abnormality. If it is equal to or more than the second threshold value γ, the indication that the ambient temperature has been changed is outputted.
    • 5. 发明授权
    • Machine tool
    • 机床
    • US07503691B2
    • 2009-03-17
    • US11404858
    • 2006-04-17
    • Kunio KojimaSusumu Maekawa
    • Kunio KojimaSusumu Maekawa
    • G01K1/20
    • G05B19/404B23Q11/0007B23Q17/22G05B2219/37285G05B2219/42281G05B2219/49214
    • A machine tool capable of detecting an ambient temperature change without a detector for detecting the ambient temperature and capable of detecting an abnormality of a temperature detector for detecting the motor temperature. Motor temperature Ti (i=1, 2 . . . n) and the current feedback Ifi of each motor are read out from the temperature detector for detecting the temperature of each motor of the machine tool. The heating value Qi of each motor is obtained from current feedback Ifi. Motor temperature Ti is calculated and estimated from the heating value Q. Difference ΔTi between the estimated motor temperature Tmi and the detected temperature Tsi is obtained. When difference between maximum and minimum values of difference ΔTi exceeds the first threshold value β, a temperature detector abnormality is outputted. When it is equal to or less than the first threshold value β, the mean value ΔT′ of differences is obtained. If the mean value ΔT′ is equal to or less than the second threshold value γ, it is determined that there is no abnormality. If it is equal to or more than the second threshold value γ, the indication that the ambient temperature has been changed is outputted.
    • 一种能够检测环境温度变化的机床,其不需要用于检测环境温度的检测器,并且能够检测用于检测电动机温度的温度检测器的异常。 从温度检测器读出电机温度Ti(i = 1,2,...,n)和每个电机的电流反馈Ifi,以检测机床各电机的温度。 每个电动机的发热值Qi从电流反馈Ifi获得。 根据发热值Q计算出电动机温度Ti,并求出估算出的电动机温度Tmi与检测温度Tsi之间的差ΔTi。 当差值DeltaTi的最大值和最小值之间的差超过第一阈值β时,输出温度检测器异常。 当它等于或小于第一阈值β时,获得差值的平均值ΔT'。 如果平均值DeltaT'等于或小于第二阈值γ,则确定没有异常。 如果等于或大于第二阈值γ,则输出环境温度已被改变的指示。
    • 8. 发明授权
    • Tool damage/abnormality detecting device
    • 刀具损坏/异常检测装置
    • US07092786B2
    • 2006-08-15
    • US11208855
    • 2005-08-23
    • Kuniharu YasugiSusumu Maekawa
    • Kuniharu YasugiSusumu Maekawa
    • G06F19/00
    • G05B19/4065B23Q17/0957B23Q17/0966G05B2219/37245G05B2219/37252G05B2219/41376G05B2219/50276
    • A tool damage/abnormality detecting device capable of easily appropriately setting an allowable range for a value of comparison between a present value and a near past average for indexes indicative of loads on a tool. A machining cycle counter index i is adjusted to i=0, machining is performed as the loads are detected in a given period, and indexes H(i) (area S of load values, absolute value (G−) of a maximum inclination between two points obtained during a decrease of loads, etc.) are acquired for n number of cycles. Thereafter, the indexes and values of comparison between the index value for a present cycle and the indexes for the n number of cycles are acquired. A first comparison value can be used for initial value setting for threshold values. If any of the comparison values is deviated from the allowable range, the threshold values are updated so that the allowable range extends, and an update history is saved. If damage/abnormality is observed visually or in any other manner, a threshold value update discontinue command is inputted, machining is stopped after completion of the cycle concerned, and update values for the latest threshold value are collected to be used as set threshold values.
    • 一种刀具损坏/异常检测装置,其能够容易地适当地设定用于指示工具上的载荷的指标的当前值和近过去平均值之间的比较值的允许范围。 加工循环计数器索引i被调整为i = 0,在给定时间段内检测到负载时进行加工,并且将H(i)(负载值的区域S,绝对值(G >)在负载减少之间获得的两个点之间的最大倾斜度等)被获取n个周期。 此后,获取当前周期的指标值与n个周期的指标之间的比较的指标和值。 第一个比较值可用于阈值的初始值设置。 如果比较值中的任一个偏离允许范围,则更新阈值使得允许范围延长,并且保存更新历史。 如果以目视或其他方式观察到损伤/异常,则输入阈值更新停止命令,在完成相关循环之后停止加工,并且收集最新阈值的更新值以用作设定的阈值。
    • 10. 发明授权
    • Controller for a machine tool for executing tapping
    • 用于执行攻丝的机床的控制器
    • US09037300B2
    • 2015-05-19
    • US13401925
    • 2012-02-22
    • Susumu MaekawaAkihiko Fujimoto
    • Susumu MaekawaAkihiko Fujimoto
    • G05D13/66B23Q15/12G05B19/16G05B19/416
    • B23Q15/12G05B19/16G05B19/186G05B19/19G05B19/416G05B19/4163G05B2219/37429G05B2219/43068G05B2219/43106G05B2219/45216
    • A controller (10) for a machine tool (18) for tapping by a main shaft and a feed shaft, comprising an identifier unit (12) for identifying an index of the size of the tap, a temperature detector unit (19b) for detecting the temperature of a motor (19a) for the main shaft, an acceleration storage unit (21) for storing the acceleration of the main shaft corresponding to the index of the size of the tap, a rate storage unit (22) for storing the rate of varying the acceleration of the main shaft depending upon the temperature of the motor, and an acceleration calculation unit (16) for calculating a new acceleration of the main shaft by multiplying an acceleration determined from the index of the size of the tap and from the acceleration storage unit by a rate determined from the detected temperature and from the rate storage unit.
    • 一种用于通过主轴和进给轴进行攻丝的机床(18)的控制器(10),包括用于识别抽头尺寸指数的标识单元(12),用于检测水头的温度检测器单元(19b) 用于主轴的电动机(19a)的温度,用于存储与抽头尺寸的指标相对应的主轴的加速度的加速度存储单元(21),用于存储速率的速率存储单元(22) 根据电动机的温度来改变主轴的加速度;以及加速度计算单元(16),用于通过将从所述水龙头的尺寸的指数确定的加速度与从所述主轴的尺寸确定的加速度相乘来计算所述主轴的新的加速度 加速存储单元,以从检测到的温度和速率存储单元确定的速率。