JP7678316B2 - machine tools - Google Patents

Description

The present invention relates to a machine tool equipped with a rotating table that rotates the tool spindle in a vertical plane.

Conventionally, machine tools have been proposed and provided that have a machining spindle that rotates in a vertical plane, and that also allow the crossing angle between the tool spindle and the workpiece axis to be changed.

The machine tool (five-axis multitasking machine) described in Patent Document 1 is proposed to have a tool mounting section 6 with a tool 7 mounted on a tool rest 5, which is rotatable in the A-axis indexing direction (see Figure 4). As shown in Figures 4 and 5, the tool mounting section 6 supports a rotating head base 22, and its rotation is controlled by a head indexing drive source 24 (motor and gear train).

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

The machine tool (multi-tasking machine) described in Patent Document 2 has a second spindle (tool spindle) below a first spindle (work spindle), and the second spindle is supported on a swivel table 5 (see Figure 1). The swivel table 5 is supported on the bed 2 so that it can rotate by a horizontal swivel axis B.

JP 2007-75995 A JP 2010-253591 A

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 surfaces. 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 intersection angle between the tool spindle and the work axis, the greater the rotational force generated on the swivel table, so the swivel table rotates due to the cutting load, meaning that rigidity is reduced even in the direction of rotation of the swivel table.

The present invention aims to provide a machine tool that can suppress uneven wear on the sliding surface of the rotating table and also suppress a decrease in the rigidity of the tool spindle in the direction of rotation of the rotating table.

To solve the above problems, a typical configuration of a machine tool according to the present invention includes a tool spindle, a circular swivel table that rotates the tool spindle in a vertical plane, and support rollers arranged around the swivel table and above the center of the swivel table, and the support rollers abut against the surface of the periphery of the swivel table facing the tool spindle, supporting the rotational moment acting on the swivel table due to the weight of the tool spindle.

It is preferable that the device has a V-groove formed on the end surface of the rotating table and a table clamp device that presses the clamp shaft against the V-groove, and that the support roller abuts against the surface of the V-groove facing the tool spindle.

It is preferable to have support rollers arranged around the swivel table and below the center of the swivel table, and the support rollers abut against the outer periphery of the swivel table to support the load of the swivel table.

It is preferable that the rotating table has a V-groove formed on its end surface, a table clamp device that presses the clamp shaft against the V-groove, and the support roller abuts in the V-groove.

According to the present invention, it is possible to provide a machine tool in which the support rollers offset the uneven load on the rotating table and suppress uneven wear on the sliding surface. In addition, since the table clamp device can strongly hold the position of the rotating table after it has rotated, the rotating table will 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.

1 is an overall perspective view of a machine tool 100 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a rotating table and its surroundings. FIG. 2 is a diagram illustrating a table clamp device. FIG. 4 is a diagram illustrating a support roller. FIG. 4 is a diagram illustrating a support roller.

The preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific values shown in the embodiment are merely examples to facilitate 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 duplicated explanations, and elements not directly related to the present invention are not illustrated.

Figure 1 is an overall perspective view of a machine tool 100 according to this embodiment. As shown in Figure 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 the spindle tool 110 can be rotated to perform machining such as cutting.

The work spindle 122 can move in the Y-axis direction (front-back direction) by means of rails 102a formed on the bed 102. The work spindle 122 has a built-in motor and can rotate the replaceably attached workpiece 120.

Figure 2 is a diagram explaining the rotating table 106 and its surroundings, where Figure 2(a) is a partial cross-sectional view of the rotating table 106, and Figure 2(b) is a cross-sectional view taken along line A-A in Figure 2(a).

The swivel table 106 (also called the B-axis table or tool swivel table) is a circular member that rotates the tool spindle 112 in a vertical plane. Around the swivel table 106, a table clamp device 140, a support roller 150, and a support roller 160 are provided.

A V-shaped groove 130 is formed on the end face of the swivel table 106. The 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.

Figure 3 is a diagram explaining 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.

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

Figure 4 is a diagram explaining the support rollers 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. The base 152 of the support rollers 150 is attached to the Z-axis table 105.

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

In this embodiment, the support roller 150 is in contact with the rear wall 134 of the V-shaped groove 130, but it may also be in contact with the front surface (front edge) of the outer periphery of the rotating table 106. In other words, the support roller 150 should be positioned so that it receives a force in the direction in which the rotating table 106 falls.

Figure 5 is a diagram explaining 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. The base 162 of the support rollers 160 is attached to the Z-axis table 105.

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

In this embodiment, the support roller 160 is in contact with the bottom surface 132 of the V-groove 130, but it may also be in contact with the outer peripheral end surface of the rotating 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.

As explained above, the support rollers 150 support part of the rotational moment acting on the swivel table 106 due to the weight of the tool spindle 112. Similarly, the support rollers 160 support part of the rotational moment acting on the swivel 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 swivel table 106 and the Z-axis table 105.

In addition, 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.

Although the preferred embodiment of the present invention has been described above with reference to the attached 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 come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

The present invention can be used as a machine tool equipped with a rotating table that rotates the tool spindle in a vertical plane.

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 (4)

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. 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. 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. 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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