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    • 3. 发明公开
    • Automatic workpart centering mechanism for a chuck
    • 自动工作台中心机构
    • EP0350799A3
    • 1991-07-24
    • EP89112420.8
    • 1989-07-07
    • BRYANT GRINDER CORPORATION
    • Gile, Richard H.
    • B23Q3/18B24B41/06
    • B23Q17/2291B23Q3/152B23Q3/183G01M1/02G05B19/402G05B2219/41206G05B2219/42152G05B2219/49113Y10T82/27Y10T279/26
    • An automatic workpart centering mechanism for a magnetic or other chuck of a machine tool is provided. A computer microprocessor controls a digital air pressure regulator and/or an air solenoid valve to supply air pressure to a pneumatic centering hammer to control striking force on a workpart as it is rotated by the chuck and held thereon by a given chuck holding force with the location of the striking force on the workpart also under control of the microprocessor. The computer microprocessor maintains and up-dates a look-up table of striking force magnitude versus incremental workpart displacement magnitude from inputs received from preceding workparts centered on the chuck and interpolates from the table a striking force to be applied next to a workpart then on the chuck to effect movement of the axis of the workpart closer to the chuck rotational axis. The accuracy of the computer in estimating the optimum force for the next strike on a workpart then on the chuck improves as the number of workparts centered on the chuck increases. Sensors are provided to sense the magnitude of incremental displacement of each workpart on the chuck resulting from each strike of the centering hammer and to sense the rotational cycles of the chuck such that the computer can determine the angular position of maximum workpart eccentricity relative to a reference marker on the chuck and can control the location at which the workpart is to be struck by the centering hammer. Alternatively, the invention can be practiced by developing a chuck holding force magnitude versus incremental workpart displacement magnitude using a given, constant strike force for the multiple, successive centering blows delivered to each workpart
    • 提供了一种用于机床的磁性或其他卡盘的自动工作台定心机构。 计算机微处理器控制数字空气压力调节器和/或空气电磁阀,以向空气定心锤提供空气压力,以在工具被旋转时控制打击力,并通过给定的卡盘保持力将其保持在其上 打击力的位置也在微处理器的控制下。 计算机微处理器维持和更新击打力量级的查找表,而不是以从卡盘为中心的前一工件接收的输入的增量工件位移幅度,并从表中插入施加在工件上的冲击力,然后在工件上 卡盘以实现工件的轴线更靠近卡盘旋转轴线的运动。 随着随着卡盘居中的工件的数量的增加,计算机在准确地估计在工件上随后在卡盘上的下一次冲击的最佳力的情况下, 提供传感器以感测由定心锤的每次撞击导致的卡盘上的每个工件的增量位移的大小,并且感测卡盘的旋转周期,使得计算机能够确定相对于参考的最大工件偏心率的角位置 标记在卡盘上,并可以控制工件通过定心锤击打的位置。 或者,本发明可以通过使用给定的恒定冲击力来发展卡盘保持力大小对增加的工件位移幅度来实施,所述冲击力用于传送到每个工件的多个连续对中的冲击