JP7579884B2 - Leveling structure for machine tools - Google Patents

Description

The present invention relates to a leveling structure for a machine tool that makes it easy to reproduce leveling.

Before shipping, machine tools are assembled at a manufacturing factory and undergo performance inspections. At that time, the bed on which the drive devices such as the spindle device and the turret device are assembled is leveled. After that, the machine tool that is disassembled and transported is leveled so that it will have the same performance when installed at the delivery factory. In this regard, the following Patent Document 1 discloses a configuration in which a pair of guide rails are laid parallel to each other on the bed, and in particular the upper surface is machined with high precision, and a level is placed on it to perform leveling. Specifically, both ends of the level are placed on the first reference surface of one guide rail end and the second reference surface of the other guide rail end, and the bed is leveled in the X direction. In addition, a level is placed on the third reference surface of the other guide rail, and the bed is leveled in the Z direction.

JP 2003-71664 A

However, in the above-mentioned conventional example, the level is placed on the guide rail, so if a movable body is attached there, leveling becomes impossible. If the leveling position for placing the level is set on the bed in this way, it is possible that a device will be attached to the guide rail when the product is transported to the delivery factory. In such a case, it will be impossible to place the level, and leveling will have to be done with the level placed in another location. In other words, it will not be possible to reproduce the same leveling as in the production factory, and the machine tool will be assembled in an insufficient state, which may result in a decrease in machining accuracy or unexpected loads causing malfunctions.

Therefore, in order to solve such problems, the present invention aims to provide a leveling structure for a machine tool that is highly reproducible.

A leveling structure for a machine tool in one aspect of the present invention relates to a machine tool having a specified processing device mounted on a bed, and has an assembly part provided on any side part of the bed, a spirit level stand fixed to the assembly part, and a reference block whose posture is adjusted and fixed to the assembly part and serves as a fixing reference for the spirit level stand, the assembly part has a horizontal receiving part protruding from any side part of the bed, the reference block is adjusted and fixed using the receiving part as a reference, and the spirit level stand is fixed to the assembly part using the reference block as a fixing reference, the reference block is a horizontally elongated block in a rectangular parallelepiped shape with cut-out step portions formed at both left and right ends of the underside, and adjustment spacers are attached to the step portions .

According to the above configuration, an assembly part is provided on any side part of the bed, and the spirit level stand is fixed based on a reference block whose posture is adjusted and fixed there. This makes it possible to reproduce the previous leveling when leveling a bed that has already been leveled in a different location.

FIG. 1 is a perspective view showing a main configuration of an embodiment of a machine tool. FIG. 2 is a perspective view of the bed of the machine tool as seen from below. 11 is a perspective view showing the leveling structure with the level holder removed from the mounting plate. FIG.

An embodiment of the leveling structure of the machine tool according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the main configuration of the machine tool of this embodiment, with the leveling structure part shown enlarged. FIG. 2 is a perspective view of the bed of the machine tool seen from below, with the leveling structure part also shown enlarged. The machine tool of this embodiment is a multi-tasking machine 1 that has both the functions of an NC lathe and a machining center. Specifically, it is an opposed two-axis lathe in which a first work spindle device 3 and a second work spindle device 4 that grip a workpiece W, and a first turret device 5 and a second turret device 6 that have a plurality of tools T are arranged symmetrically, and in addition, a tool spindle device 2 is provided in the center of the machine body.

The pair of first and second work spindle devices 3, 4 are each fitted with a spindle chuck mechanism 11 for a headstock 12, which rotates when driven by a spindle motor 13, allowing the gripped work W to be phased during machining and rotated at a predetermined speed. The headstock 12 and spindle motor 13 are mounted on a spindle slide 14, and are configured to move on the bed 7 in the Z-axis direction, which is the width direction of the machine body. A guide rail 15 parallel to the Z-axis is fixed to the front of the tilted bed 7, and a ball screw mechanism is provided to convert the rotational motion of the spindle motor into linear motion for the spindle slide 14 that slides on the guide rail.

Next, the first turret device 5 and the second turret device 6 are located behind the first work spindle device 3 and the second work spindle device 4, and the rotation of the indexing servo motor 16 controls the rotation of the tool T (turret tool) attached to the turret 17. In order to move the tool T to a machining position for the workpiece W, a drive mechanism using a ball screw is provided in the guide rail movement mechanism so that the turret 17 moves in two directions, forward and backward and up and down, of the machine body perpendicular to the Z axis.

The tool spindle device 2 has a built-in type spindle head 18 with a built-in spindle servo motor and tool spindle, and is mounted on a spindle slide 19 that can move in the vertical X-axis direction. The spindle slide 19 is mounted on a base slide 20, and is configured to be movable in the horizontal Y-axis direction in the fore-and-aft direction of the machine body. The spindle head 18 allows tools T (spindle head tools) to be replaced depending on the machining content, and is configured to rotate around the B-axis that is parallel to the Y-axis.

The multitasking machine 1 is designed to save space by reducing the dimensions in the fore-aft direction of the machine body, while the slant-type bed 7 has a large dimension in the width direction of the machine body. Each of the devices 2, 3, 4, 5, 6 that move on the bed 7 is configured to move linearly along a guide rail, but the first and second work spindle devices 3, 4 in particular have a longer moving distance than the others. For this reason, it is preferable to level the bed 7 on the front side where the guide rail 15 is fixed.

The multi-tasking machine 1 is leveled during assembly before shipping, but the same level must be reproducible when it is installed at the recipient's factory. To achieve this, it is desirable that the leveling before shipping, i.e., the position and state of the spirit level, be the same when it is installed at the recipient's factory. However, there are cases where the machine is delivered to the factory in a state where a certain degree of assembly has already been completed. Therefore, it is not desirable to perform leveling on the guide rail where the device is assembled, as in the conventional example described above.

Therefore, the leveling structure of this embodiment is provided in three places on the side of the bed 7 where there is nothing overlapping, particularly on the front part close to the guide rail 15. The leveling structure is configured as an assembly part in which an assembly plate 31 is fixed integrally to the front part of the bed 7 by welding or the like, and a level holder 32 for placing a level 28 on is removably attached to this assembly part. Figure 3 is a perspective view showing the leveling structure with the level holder 32 removed from the assembly plate 31.

The rectangular mounting plate 31 has a horizontal receiving portion 311 protruding along the bottom edge, and the level holder 32 and other components are mounted using the receiving portion 311 as a reference. The level holder 32 is fixed so that a reference block 33, which is an integral part of an adjustment spacer 35, is sandwiched between the receiving portion 311 and the level holder 32. The reference block 33 is a horizontally elongated block with a rectangular parallelepiped shape as shown in the figure, and is fastened and fixed to the tapped mounting plate 31 side from the front by two bolts 36. The reference block 33 has notched steps 331 at both left and right ends on the underside, and the adjustment spacers 35 are placed on top of these and screwed in from below.

Since the adjustment spacer 35 protrudes from the underside of the reference block 33, the position where the adjustment spacer 35 abuts against the receiving portion 311 becomes the mounting position of the reference block 33 fixed to the assembly plate 31. The reference block 33 protrudes forward from the receiving portion 311 by about 10 mm. The spirit level stand 32 is positioned against the reference block 33 and fixed to the assembly plate 31.

The level holder 32 has a mounting portion 321 for placing the level 28 and a fixing portion 322 bent at a right angle from the mounting portion 321. The fixing portions 322 are provided on both sides of the reference block 33 and have a daruma hole through which the bolt 37 passes. The level holder 32 is fixed to the assembly plate 31 so that the mounting portion 321 protrudes in a horizontal direction perpendicular to the vertical front surface of the bed 7. At this time, the mounting portion 321 of the level holder 32 is placed against the reference block 33 to adjust its position. This adjustment is made possible by changing the position of the reference block 33 by grinding the thickness of the left and right adjustment spacers 35.

When assembling a multi-tasking machine 1 equipped with such a leveling structure before shipment, a leveling operation is performed to check the straightness of the horizontal axis relative to the guide rail 15. After the leveling operation is completed for the bed 7, a reproduction adjustment operation is performed in which the level 28 is placed on the level stand 32 as shown in FIG. 1. In other words, the level stand 32 attached to the leveled bed 7 is leveled, and if the level of the level stand 32 is not correct, the inclination of the level stand 32 is fine-tuned so that the value of the level 28 becomes zero. Specifically, the adjustment spacer 35 is polished to adjust the left and right inclination of the reference block 33 relative to the receiving portion 311 of the assembly plate 31.

The level table 32, where the value of the level 28 has become zero through this adjustment work, corresponds to the leveled state of the bed 7, and this is referred to as the leveled state of the level table 32. After that, the first and second work spindle devices 3, 4, as well as the first and second turret devices 5, 6 and the tool spindle device 2 are assembled onto the bed 7, and the multi-tasking machine 1 is completed when an automatic tool changer, automatic work transport device, and machining waste discharge device (not shown) are also assembled. At this time, the level table 32, which protrudes from the front of the bed 7, gets in the way, so the level table 32 is temporarily removed while leaving the reference block 33 in place.

Next, when installation work is performed at the recipient's factory, the level holder 32 is attached again to the front of the bed 7 for leveling. At this time, the adjusted reference block 33 remains fixed to the mounting plate 31 of the bed 7, so the level holder 32 is positioned against the reference block 33 to reproduce the leveled state described above. Therefore, by placing the level 28 on the level holder 32 and leveling, the bed 7 is leveled with the straightness of the horizontal axes of the guide rails 15, etc. adjusted. After that, the level holder 32 is removed again and an automatic tool changer, etc. is installed to complete the multi-tasking machine 1.

Therefore, in this embodiment, the position of the leveling structure for placing the spirit level 28 is not a location where devices will be assembled later like the guide rail shown in the conventional example, but is a side portion of the bed 7 that is not affected by assembly. Therefore, even when the multi-tasking machine 1 is assembled after delivery, the spirit level stand 32 is fixed in the same position on the assembly plate 31 and in the same orientation according to the reference block 33. Then, by performing leveling using the spirit level 28 on the spirit level stand 32, the leveling of the bed 7 performed during assembly before shipment can be reproduced.

In addition, in the leveling structure of this embodiment, the spirit level stand 32 is removable, so it can be removed and does not get in the way when not performing leveling work. And because the reference block 33 remains fixed in the adjusted state, when the spirit level stand 32 is reinstalled according to the reference block 33, the previous leveling state is highly reproducible.

Although one embodiment of the present invention has been described, the present invention is not limited to this embodiment, and various modifications are possible without departing from the spirit of the present invention.
For example, in the above embodiment, a leveling structure is provided on the side of the bed 7, particularly on the front portion close to the guide rail 15, but the leveling structure may be provided in another location on the side as long as it does not get in the way even after assembly.

Reference Signs List 1... Multi-tasking machine 2... Tool spindle device 3... First work spindle device 4... Second work spindle device 5... First turret device 6... Second turret device 7... Bed 28... Level 31... Assembly plate 32... Level stand 33... Reference block 35... Adjustment spacer

Claims (1)

A leveling structure for a machine tool having a predetermined processing device mounted on a bed,
An assembly part provided on any side part of the bed;
a level holder fixed to the assembly portion;
a reference block whose posture is adjusted and fixed to the assembly section, and which serves as a fixing reference for the level stand;
The mounting section has a horizontal receiving portion protruding from an arbitrary side portion of the bed, the reference block is adjusted in position with reference to the receiving portion and fixed, and the level stand is fixed to the mounting section with reference to the reference block as a fixed reference,
The reference block is a horizontally elongated block having a rectangular parallelepiped shape, with stepped portions cut out at both left and right ends of the underside, and an adjustment spacer is attached to the stepped portions, forming a leveling structure for a machine tool.

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