公开(公告)号：US20150160643A1

公开(公告)日：2015-06-11

申请号：US14475166

申请日：2014-09-02

Applicant: The University of Tokyo ,  DMG MORI SEIKI CO., LTD.

Inventor： Hiroshi Fujimoto ,  Teruaki Ishibashi ,  Shinji Ishii ,  Koji Yamamoto ,  Yuki Terada

IPC: G05B19/18

CPC classification number: G05B19/404 ,  G05B2219/41115 ,  G05B2219/41256

Abstract: Using a machine tool, a workpiece is machined while periodically varying the rotational speed of a spindle thereof. Correlation data on correlation between a speed variation rate RVA of the spindle rotational speed, a speed variation period ratio RVF thereof, and vibration of a tool when machining the workpiece while periodically varying the spindle rotational speed is previously obtained. Based on the correlation data, the speed variation rate RVA and the speed variation period ratio RVF are set so that the vibration of the tool and machining accuracy are within their respective allowable ranges, and based on the set speed variation rate RVA and speed variation period ratio RVF, a variation amplitude and a variation period of the spindle rotational speed are determined. The spindle is rotated at the rotational speed varying at the determined amplitude and period with respect to a target rotational speed, thereby machining the workpiece.

Abstract translation: 使用机床，在周期性地改变其主轴的转速的同时加工工件。 预先获得主轴转速的速度变化率RVA，其速度变化周期比RVF与加工工件同时周期性地改变主轴转速时的工具的振动之间的相关性的相关数据。 基于相关数据，设定速度变化率RVA和速度变化周期比RVF，使得刀具的振动和加工精度在其各自的允许范围内，并且基于设定速度变化率RVA和速度变化周期 比率RVF，主轴转速的变化幅度和变化周期被确定。 主轴以相对于目标转速确定的振幅和周期变化的转速旋转，从而加工工件。

公开(公告)号：US20150145464A1

公开(公告)日：2015-05-28

申请号：US14474823

申请日：2014-09-02

Applicant: The University of Tokyo ,  DMG MORI SEIKI CO., LTD.

Inventor： Hiroshi Fujimoto ,  Hongzhong Zhu ,  Koji Yamamoto ,  Shinji Ishii

IPC: G05B6/02 ,  G05B11/01 ,  G05B13/02

CPC classification number: G05B19/404 ,  G05B2219/41154 ,  G05B2219/41155

Abstract: A controller has a control unit generating a control signal to control a drive motor and a friction compensation unit adding a friction compensation signal to the control signal for compensating for a positioning error caused by friction in a guide unit. When reversing the direction of movement of the movable body, the friction compensation unit generates a friction compensation signal in accordance with a function f(α) representing a friction compensation value uf by a relationship with a variable α and asymptotically approaching the maximum value and the minimum value of the friction compensation value uf and having an inflection point therebetween, and adds the generated friction compensation signal to the control signal generated by the control unit during movement of the movable body a predetermined movement distance from before to after the reversing.

Abstract translation: 控制器具有产生控制信号以控制驱动电机的控制单元和摩擦补偿单元，该摩擦补偿单元向控制信号添加摩擦补偿信号，以补偿由引导单元中的摩擦引起的定位误差。 当反转移动体的移动方向时，摩擦补偿单元根据表示摩擦补偿值uf的函数f（α）产生摩擦补偿信号，该函数f（α）与变量α的关系渐近地接近最大值，并且 摩擦补偿值uf的最小值，并且在其之间具有拐点，并且将所产生的摩擦补偿信号相加于由可移动体在从反转之前到之后的预定移动距离期间由控制单元产生的控制信号。