Working machinery

Abstract

To provide a machine tool which can suppress uneven wear of a slide surface of a swivel table, and can also suppress deterioration in rigidity of a tool spindle in a rotation direction of the swivel table.SOLUTION: A machine tool comprises: a tool spindle 112; a circular swivel table 106 which swings the tool spindle 112 in a vertical plane; and a support roller 150 which is located around the swivel table 106, and above a center of the swivel table 106. The support roller 150 contacts a surface on a circumference of the swivel table 106 that faces the tool spindle 112 side, and supports a rotation moment that is applied to the swivel table 106 by a weight of the tool spindle 112.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a machine tool equipped with a rotating table that rotates a tool spindle in a vertical plane. [Background technology]

[0002] 2. Description of the Related Art Machine tools have been proposed and provided that have a machining spindle that rotates in a vertical plane and further allow the intersecting angle between the tool spindle and workpiece axis to be changed.

[0003] The machine tool (five-axis multi-axis machining center) described in Patent Document 1 proposes a configuration in which a tool mounting section 6 having a tool 7 mounted thereon is provided on a tool rest 5 so as to be rotatable in the A-axis indexing direction (see Fig. 4). As shown in Figs. 4 and 5, the tool mounting section 6 axially supports a rotating head base 22, and its rotation is controlled by a head indexing drive source 24 (motor and gear train).

[0004] In the configuration of Patent Document 1, a drive source 24 for rotating a tool attachment unit 6 is provided in a tool rest 5 that is movable in the YZ-axis directions. The tool rest 5, which is a movable part, becomes significantly larger and heavier, which poses a problem that a drive device for moving the tool rest 5 also becomes larger. In addition, the rotating head base 22 of the tool attachment unit 6 is only positioned by a gear train of the drive source 24, which poses a problem of low rigidity of the tool spindle.

[0005] The machine tool (multi-tasking machine) described in Patent Document 2 has a configuration in which a second spindle (tool spindle) is provided below a first spindle (work spindle), and the second spindle is supported on a swivel table 5 (see FIG. 1). The swivel table 5 is supported on a bed 2 by a horizontal swivel axis B so as to be rotatable. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2007-75995 A [Patent Document 2] JP 2010-253591 A Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Document 2, the swivel table is placed directly on the bed, making it easy to obtain rigidity, but the tool spindle is heavy, so an uneven load is generated between the swivel table and the bed, causing uneven wear on the sliding surface. When uneven wear occurs, a gap is generated between the swivel table and the bed, causing rattling and reducing rigidity. In addition, the larger the cross angle between the tool spindle and the work axis is, the greater the rotational force generated on the swivel table, so the swivel table rotates due to the cutting load, which means that the rigidity is also reduced in the rotation direction of the swivel table.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a machine tool capable of suppressing uneven wear on the sliding surface of the rotating table and also suppressing a decrease in the rigidity of the tool spindle in the rotational direction of the rotating table. [Means for solving the problem]

[0009] In order to solve the above problems, a representative configuration of a machine tool according to the present invention includes a tool spindle, a circular turning table which turns the tool spindle in a vertical plane, and support rollers which are arranged around the turning table and above the center of the turning table, and which abut on the surface of the outer periphery of the turning table which faces the tool spindle, thereby supporting the rotational moment acting on the turning table due to the weight of the tool spindle.

[0010] It is preferable that the rotating table is provided with a V-groove formed on the end surface thereof and a table clamp device which presses a clamp shaft against the V-groove, and that the support roller abuts against the surface of the V-groove facing the tool spindle.

[0011] It is preferable that the rotating table has support rollers arranged around the rotating table and below the center of the table, the support rollers contacting the outer periphery of the rotating table to support the load of the rotating table.

[0012] It is preferable to have a V-groove formed on the end surface of the swivel table and a table clamp device that presses a clamp shaft against the V-groove, and the support roller abuts in the V-groove. Effect of the Invention

[0013] According to the present invention, it is possible to provide a machine tool in which the support rollers offset the uneven load of the rotating table and suppress uneven wear of the sliding surface. In addition, since the table clamp device can strongly hold the position of the rotating table after it has been rotated, the rotating table does not shift even when a cutting load is applied, and it is also possible to suppress a decrease in the rigidity of the tool spindle in the rotation direction of the rotating table. [Brief description of the drawings]

[0014] [Figure 1] 1 is an overall perspective view of a machine tool 100 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating a rotating table and its surroundings. [Diagram 3] FIG. 2 is a diagram illustrating a table clamp device. [Figure 4] FIG. 4 is a diagram illustrating a support roller. [Diagram 5] FIG. 4 is a diagram illustrating a support roller. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific values ​​shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present invention are not shown.

[0016] FIG. 1 is an overall perspective view of a machine tool 100 according to this embodiment. As shown in FIG. 1, in the machine tool 100 according to this embodiment, a column 103 is installed on a bed 102, and an X-axis table 104 is attached to the column 103. The X-axis table 104 is provided so as to be movable in the X-axis direction (left and right direction) by rails 103a, and a Z-axis table 105 is provided on the X-axis table 104 so as to be movable in the Z-axis direction (up and down direction) by rails 104a. A swivel table 106 is provided rotatably on the Z-axis table 105. A tool spindle 112 is attached to the swivel table 106, and the angle (axis crossing angle) of the tool spindle 112 can be set by rotating the swivel table 106. A spindle tool 110 is attached to the tool spindle 112 in an exchangeable manner. The tool spindle 112 has a built-in motor, and machining such as cutting can be performed by rotating the spindle tool 110.

[0017] The work spindle 122 is movable in the Y-axis direction (front-rear direction) by rails 102a formed on the bed 102. The work spindle 122 has a built-in motor and can rotate the replaceably attached workpiece 120.

[0018] 2A and 2B are diagrams for explaining the swivel table 106 and its surroundings, in which FIG. 2A is a partial cross-sectional view of the swivel table 106, and FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A.

[0019] The turning table 106 (also called the B-axis table or tool turning table) is a circular member that turns the tool spindle 112 in a vertical plane. A table clamp device 140, a support roller 150, and a support roller 160 are provided around the turning table 106.

[0020] A V-shaped V-groove 130 is formed on the end face of the swivel table 106. The V-groove 130 has a bottom surface 132 in the center, a rear wall 134 on the X-axis table 104 side, and a front wall 136 on the tool spindle 112 side. Here, the rear wall 134 is the surface facing the tool spindle side.

[0021] 3 is a diagram illustrating the table clamp device 140. A plurality of table clamp devices 140 (four in this embodiment) are provided around the swivel table 106. It is preferable that the table clamp devices 140 are arranged symmetrically with respect to the center of the swivel table 106. In other words, the four table clamp devices 140 can be considered as two pairs of table clamp devices 140.

[0022] The table clamp device 140 is attached to the X-axis table 104. The table clamp device 140 has a built-in cylinder and moves a clamp shaft 144 forward and backward toward the V-groove 130. When the clamp shaft 144 is protruded and pressed against the rear wall 134 as shown in Fig. 3(a), the rotation of the swivel table 106 can be restricted. When the clamp shaft 144 is retracted as shown in Fig. 3(b), the swivel table 106 can be freely rotated.

[0023] 4 is a diagram illustrating the support roller 150. A plurality of support rollers 150 (four in this embodiment) are provided around the swivel table 106 and above the center of the swivel table 106. A base 152 of the support roller 150 is attached to the Z-axis table 105.

[0024] The support roller 150 abuts against a rear wall 134 (the surface facing the tool spindle) in a V-shaped groove 130 on the outer periphery of the turning table 106. The support roller 150 is always in contact with the rear wall 134 and follows the rotation of the turning table 106. As a result, the support roller 150 supports part of the rotation moment acting on the turning table 106 due to the weight of the tool spindle 112.

[0025] In this embodiment, the support rollers 150 are in contact with the rear wall 134 of the V-shaped groove 130, but they may be in contact with the front surface (front edge) of the outer periphery of the swivel table 106. In other words, the support rollers 150 should be disposed so as to receive a force in a direction in which the swivel table 106 falls.

[0026] 5 is a diagram illustrating the support rollers 160. A plurality of support rollers 160 (two in this embodiment) are provided around the swivel table 106 and below the center of the swivel table 106. A base 162 of the support rollers 160 is attached to the Z-axis table 105.

[0027] The support rollers 160 come into contact with the outer periphery of the turning table 106 to support the load of the turning table 106. In this embodiment, the support rollers 160 come into contact with the bottom surface 132 of the V-shaped groove. The support rollers 160 are always in contact with the turning table 106 and are driven by the rotation of the turning table 106. As a result, the support rollers 160 support part of the rotation moment acting on the turning table 106 due to the weight of the tool spindle 112.

[0028] In this embodiment, the support roller 160 is in contact with the bottom surface 132 of the V-groove 130, but it may be in contact with the outer peripheral end surface of the turn table 106. However, by having the support roller 160 in contact with the inside of the V-groove 130, the running of the support roller 160 can be stabilized.

[0029] As described above, the support rollers 150 support part of the rotational moment applied to the turning table 106 due to the weight of the tool spindle 112. Similarly, the support rollers 160 support part of the rotational moment applied to the turning table 106 due to the weight of the tool spindle 112. This makes it possible to suppress uneven wear on the sliding surfaces of the turning table 106 and the Z-axis table 105.

[0030] Furthermore, by fixing the rotation of the swivel table 106 with the table clamp device 140, it is possible to prevent the swivel table 106 from rotating due to the cutting load. Therefore, it is also possible to suppress a decrease in the rigidity of the tool spindle 112 in the rotation direction of the swivel table 106.

[0031] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can think of various modified or altered examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. [Industrial Applicability]

[0032] The present invention can be used as a machine tool equipped with a rotating table that rotates a tool spindle in a vertical plane. [Explanation of symbols]

[0033] 100...machine tool, 102...bed, 102a...rail, 103...column, 103a...rail, 104...X-axis table, 104a...rail, 105...Z-axis table, 106...turning table, 110...spindle tool, 112...tool spindle, 120...workpiece, 122...workpiece spindle, 130...V-groove, 132...bottom surface, 134...rear wall, 136...front wall, 140...table clamp device, 144...clamp shaft, 150...support roller, 152...base of support roller, 160...support roller, 162...base of support roller

Claims

1. A tool spindle; a circular rotating table for rotating the tool spindle in a vertical plane; a support roller disposed around the swivel table and above the center of the swivel table; The machine tool, characterized in that the support roller abuts against a surface of the outer periphery of the rotating table facing the tool spindle, thereby supporting a rotational moment acting on the rotating table due to the weight of the tool spindle.

2. A V-groove formed on an end surface of the rotating table; a table clamp device that presses a clamp shaft into the V-shaped groove, 2. The machine tool according to claim 1, wherein the support roller abuts against a surface of the V-groove facing the tool spindle.

3. a support roller disposed around the swivel table and below the center of the swivel table; 3. The machine tool according to claim 1, wherein the support rollers abut against an outer periphery of the rotating table to support a load of the rotating table.

4. A V-groove formed on an end surface of the rotating table; a table clamp device that presses a clamp shaft into the V-shaped groove, 4. The machine tool according to claim 3, wherein the support roller abuts in the V-groove.

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