JPH0615945U - Clamping device for movable table - Google Patents

Abstract

(57) [Summary] [Structure] The movable table 14 that rotates around the axis of the support shaft 15 is provided, and the edge 16a on one side of the clamp disk 16 that is fixed to the movable table has an arc shape concentric with the support shaft 15. To
In addition, a push rod 18 that is formed so as to have a wedge-shaped cross section and that moves in and out in the radial direction of rotation of the movable table 14 to press the edge portion 16a of the clamp disk 16 is provided, and the clamp disk 16 is provided at the tip of the push rod 18. A groove portion is provided in pressure contact with the edge portion 16a. [Effect] By pressing the inner surface of the groove portion of the push rod 18 to both side surfaces of the front and back of the clamp disc 16, the frictional force between the clamp disc 16 and the push rod 18 is greater than that when clamping the disc on a conventional plane. As a result, the movable table 14 can be securely held in place.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a movable table clamp device for holding a movable table in a machine tool or the like in an inclined state at an appropriate angle.

[0002]

[Prior art]

 Conventionally, a machine tool or the like has a table on which a workpiece is placed, and in order to adjust the angle of the workpiece, the table is rotatably mounted around the axis of a spindle. The table surface can be tilted at an appropriate angle.

Then, a disk is provided at one end of the rotary support shaft of the table, and the peripheral edge surface of the disk is pressed by a rod, whereby the table is fixed and held in an inclined state.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional configuration, the contact between the peripheral edge surface of the disc and the rod becomes a line contact between the curved surface of the disc and the flat surface of the rod, and the clamping force is weak, so the table and the workpiece on the table vibrate during machining. However, there is a problem that a processing error occurs due to the displacement of the table.

The present invention solves the above problems, and an object of the present invention is to provide a clamp device for a movable table that can firmly and firmly hold the table.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the movable table clamping device of the present invention is provided with a movable table that rotates around the axis of the support shaft, and the clamp disk fixed to the movable table is separated from the support shaft by an appropriate distance. The clamp disk is provided at a position, and one edge of the clamp disk is formed in an arc shape concentric with the support shaft and has a wedge-shaped cross section. A push rod that pushes the edge and a drive means that drives the push rod to move back and forth are provided, and the tip of the push rod has a groove corresponding to the edge of the clamp disc and has a groove that presses against both sides of the clamp disc. The configuration is provided.

[0007]

[Action]

 In the above structure, the movable table is rotated around the axis of the support shaft and tilted at an arbitrary angle. Then, the push rod is extended toward the clamp disc by the driving means, the groove portion at the tip of the push rod is engaged with the peripheral edge portion of the clamp disc, and the clamp disc is pressed and fixed by the push rod. At this time, since the push rod presses against both sides of the front and back of the clamp disc at the inner surface of the groove, the frictional force between the disc and the push rod becomes larger than when clamping the disc on a conventional flat surface. The movable table can be securely held in place.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a machining center that is a machine tool. In FIG. 1, a Z-axis moving pedestal 2 that moves in the Z-axis direction by a screw feeding mechanism or the like is provided on the bed 1, and the Z-axis moving pedestal 2 is moved to the Z-axis in the horizontal plane by the screw feeding mechanism or the like. An X-axis moving pedestal 3 that moves in the orthogonal X-axis direction is provided. A table device 4 is provided on the X-axis moving base 3.

Further, the bed 1 is provided with a fixed column 5, and the fixed column 5 is provided with a spindle head 6 which is vertically moved along a guide by a screw jack mechanism or the like. The spindle head 6 has a spindle that rotates about a horizontal axis by a spindle motor or the like, and a face plate 7 that rotates integrally with the spindle is attached to the tip of the spindle. Further, the face plate 7 is provided with a slide portion 8 that reciprocates in the U-axis direction orthogonal to the axis of the main shaft, and the slide portion 8 is provided with a tool holder 9 that detachably holds a machining tool.

FIG. 2 is a schematic diagram showing the configuration of the table device 4. In FIG. 2, the table device 4 includes a rotary table device 11 and a tilt table device 12. In this rotary table device 11, a table surface 11a is rotated around an axis perpendicular to the surface by a rack and pinion mechanism or the like. The tilting table device 12 has a fixed base 13 and a movable table 14, and the movable table 14 is rotated around a horizontal axis with respect to the fixed base 13.

3 to 5 are schematic views showing the configuration of the tilting table device 12. In FIGS. 3 to 5, the fixed pedestal 13 rotatably holds a horizontal support shaft 15 connected and fixed to the movable table 14, and the movable table 14 is rotatably driven by the support shaft 15. (Not shown) rotates about the axis of the support shaft 15.

A clamp disk 16 is provided on the movable table 14 at a position separated from the support shaft 15 by an appropriate distance, and one side edge portion 16 a of the clamp disk 16 has an arc shape concentric with the support shaft 15, and The cross-sectional shape is wedge-shaped. Further, a cylinder device 17 is provided so as to face the edge portion 16a of the clamp disc 16, and the cylinder device 17 moves in and out in the rotation radius direction of the movable table 14 to push the edge portion 16a of the clamp disc 16 with a push rod 18. Is equipped with. A groove 18a is formed at the tip of the push rod 18 so as to clamp the edge 16a of the clamp disk 16 and is in pressure contact with both side surfaces of the clamp disk.

The operation of the above configuration will be described below. The workpiece placed on the table device 4 is subjected to machining such as cutting by the machining tool held by the tool holder 9 of the rotating face plate 7. At this time, the position and orientation of the workpiece are adjusted by the movement of the Z-axis moving base 2 and the X-axis moving base 3 and the rotation and tilting of the table device 4, and further the movement of the spindle head 6 in the Y-axis direction is performed. Then, the relative positional relationship between the machining surface of the workpiece and the cutting edge of the machining tool is controlled.

In the above-described operation, when the workpiece is tilted by driving the table device 4, the movable table 14 is rotated around the axis of the support shaft 15 and the table surface 11 a of the rotary table device 11 is rotated. An arbitrary inclination angle is given to the work piece fixedly held at. Then, the push rod 18 of the cylinder device 17 is extended toward the clamp disc 16, the groove portion 18a at the tip of the push rod 18 is engaged with the edge portion 16a of the clamp disc 16, and the clamp rod 16 is pressed by the push rod 18. And fix it.

At this time, the pressing force F in the moving direction of the push rod 18, the apex angle α of the clamp disk 18, the pressing force R of the clamp surface on the front and back clamp surfaces of the clamp disk 18, and the friction angle φ are set. In between, the following equation holds.

F = 2Rsin (α + φ) / cosφ On the other hand, the frictional force on the clamp surface is 2Rμ (μ is a friction coefficient), and the frictional force when clamping on a flat surface as in the conventional case is Fμ. Therefore, by reducing the apex angle α, the frictional force between the clamp disc 16 and the push rod 18 becomes larger than that in the conventional case where the disc is clamped on a flat surface, and the movable table 14 is securely fixed and held. be able to. For example, when α is 15 °, μ is 0.2, and F is 1000 kgf, R is 827 kgf, and the frictional force on the clamp surface is 1.65 times the frictional force on the flat surface.

[0017]

[Effect of device]

 As described above, according to the present invention, the frictional force between the disc and the push rod causes the disc to move in a conventional plane by pressing the inner surface of the groove of the push rod against both sides of the front and back of the clamp disc. It is larger than when clamped, and the movable table can be held securely.

[Brief description of drawings]

FIG. 1 is a schematic view of a machining center of the present invention.

FIG. 2 is a schematic diagram of a table device according to the same embodiment.

FIG. 3 is a schematic view of a tilting table device of the same embodiment.

FIG. 4 is a schematic view of a clamp disc and a push rod of the same embodiment.

FIG. 5 is an explanatory view showing an engaged state of an edge portion of the clamp disc and a groove portion of the push rod of the embodiment.

[Explanation of symbols]

 13 Fixed Pedestal 14 Movable Table 15 Support Shaft 16 Clamp Disc 16a Edge 18 Push Rod 18a Groove

Claims (1)

[Scope of utility model registration request] 1. A movable table that rotates about the axis of a support shaft is provided, a clamp disk fixed to the movable table is provided at a position separated from the support shaft by an appropriate distance, and an edge of one side of the clamp disk is provided. The push rod and push rod that are formed in an arc shape concentric with the support shaft and have a wedge-shaped cross-section and that move in and out in the radial direction of rotation of the movable table to press the edge of the clamp disk are driven to move in and out. A clamp device for a movable table, characterized in that drive means is provided, and a groove portion having a shape corresponding to the edge portion of the clamp disc is provided at a tip end portion of the push rod to be pressed against both side surfaces of the clamp disc.