Toyoda Koki Kabushiki Kaisha

Katsuhiko Takeuchi

Hiroaki Suzuki

Yoshio Wakazono

Akira Tsuboi

Wataru Iida

Yutaka Inada

Hideki Iwai

Kazuo Machida

Tomohisa Katou

Tomohisa Kato

A machine tool includes X-axis, Y-axis, and Z-axis moving units for producing relative movements between a tool and a workpiece; a C-axis drive unit for rotating the workpiece about a C-axis parallel to the Z-axis; and a B-axis turning unit for turning the tool about a B-axis parallel to the Y-axis. The tool is disposed in such a manner that a machining point of the tool coincides with the B-axis. The moving units, the drive unit, and the turning unit are controlled in such a manner that a work point of the workpiece coincides with the machining point of the tool. The bed is formed through casting and has a hollow structure and a hole as cast; and a cover is provided to cover the hole as cast in order to close the interior of the bed.

Machine tool and bed structure thereof

It is one object of a hale-machining method and apparatus thereof according to the present invention to achieve an easy preparation of an NC machining program and perform a high geometrical accuracy in the predetermined three-dimensional free curved surface. A haling toolis set on a tool holderin such a manner that a cutting point P of the haling toolis substantially coincided with an intersection of a first rotating axis B, a second rotating axis A and a third rotating axis C. A rotary tableand a rotary baseare rotated in such a manner that a tool axis direction of said haling tool is substantially coincided with a normal direction of said machined surface. A tool holderis rotated in such a manner that a front rake surface of the haling toolis substantially directed in perpendicular to a feeding direction of said haling tool. A workpiece table holding a workpiece and the tool holder are relatively moved along a machined surface of said workpiece in three perpendicular axes including an axis parallel to said first rotating axis.

Hale-machining method and apparatus

A machine tool is structured enhance rigidity of a slide member opposing to a cutting force acting on a tool spindle with no extra increase in weight, thereby intending to lighten the slide member. The machine tool comprises a tool spindle rotating around an axis extending along an Z-axis, a slide member slidable in at least one of the X-axis, Y-axis and Z-axis directions and a guide apparatus having a straight rail and movably supporting the slide member on the guide rail and disposed such that three supporting points for supporting the slide member form vertexes of a triangle as seen from the X-axis direction. Further, in another construction, two sets of linear guide mechanism and a linear motor for guiding each of an upper portion and a lower portion of a gantry are respectively disposed between a lower surface of the gantry and a base, and between a front surface of a cross beam and an upper back surface of the gantry, so that the cross beam does not lap over the upper surface of the gantry.

Machine tool

An apparatus for determining the profile of a cylindrical workpiece whose radius varies with axial position. The apparatus is equipped with a spindle head and a pair of detectors. The spindle head supports and rotates the workpiece. The detectors are mounted on opposite sides of the axis of rotation of the workpiece and detect the position of the outer surface of the workpiece. When the workpiece is being rotated, the spindle head is moved parallel to the axis of the spindle. As a result, the detectors cross the outer surface of the workpiece. Also, the detectors are moved radially along an ideal profile of the workpiece in synchronism with the movement of the head. A control unit calculates the average of first and second output signals from the detectors, respectively, and produces the average as the profile error. In another embodiment, only one detector is used. The control unit measures the profile while the detector is positioned on one side of the axis of the spindle. The output signal from the detector is stored as a first output signal in the control unit. Then, the detector is moved to the opposite side of the axis of the spindle. Under this condition, the profile is again measured. The output signal from the detector is stored as a second output signal. The profile error is calculated from the average of the stored, first and second output signals.

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Anjo, Japan

Katsuhiko Takeuchi