Angle adjustment structure for machine tools and machine tools

Abstract

To provide a machine tool angle adjustment structure that allows for simple and inexpensive fine adjustment of the mounting angle of a rotating part such as the spindle head to the spindle ram. [Solution] In a machine tool that processes a workpiece by connecting a spindle unit 1 to a spindle ram 3 equipped with a rotating part, a plate-shaped liner 10 is inserted into the fixing part 1a that connects the spindle unit 1 to the spindle ram 3 to adjust the inclination of the spindle unit 1 with respect to the spindle ram 3. The liner 10 is formed in four sections, and each of the divided sections 11 is formed with a uniform thickness, while at least one of the divided sections 11 has a different thickness from the other divided sections 11 that make up the liner 10.

Description

Technical Field

[0001] The present invention relates to a machine tool, and particularly to an angle adjustment structure of a spindle head in a machine tool with a replaceable spindle head.

Background Art

[0002] Machine tools represented by machining centers widely employ those with a replaceable spindle head. For example, the machine tool described in Patent Document 1 is a vertical machining center, and a configuration is disclosed in which a two-axis control attachment is detachably mounted on the tip of the ram of the main body. When the spindle head is replaced in such a machine tool, the axis of the spindle head may slightly tilt with respect to the ram of the main body. In such a case, adjustment is required to eliminate the tilt.

[0003] For example, in a gantry machining center, fine adjustment of the mounting angle of the spindle head to the spindle ram or the mounting angle of the internal parts of the spindle head is required according to component errors and the like. In particular, in recent years, the demand for higher precision has increased. Conventionally, angle correction was performed by manual scraping, or as shown in FIG. 1, a thin plate-like component (liner) was added, and this liner was obliquely cut on a surface grinding machine to perform angle adjustment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As mentioned above, fine-tuning the mounting angle of the spindle head and other components to the spindle ram required manual work by scraping the parts, which was time-consuming and burdensome for the operator. Furthermore, adjustments using liners required grinding the liners at an angle on a surface grinder, necessitating setups tailored to the desired angle. As a result, even slight angle adjustments required numerous setups.

[0006] Therefore, this disclosure has been made in view of the above-mentioned problems, and aims to provide an angle adjustment structure for a machine tool that allows for simple and inexpensive fine adjustment of the mounting angle of a rotating part such as a spindle head to the spindle ram. [Means for solving the problem]

[0007] To achieve the above objective, the first configuration of the present disclosure is an angle adjustment structure for a machine tool that processes a workpiece by connecting a swivel section to a spindle ram equipped with a rotating section, wherein a plate-shaped liner is inserted between the spindle ram and the swivel section, or in the swivel section, to adjust the inclination of the swivel section with respect to the spindle ram, wherein the liner is formed by dividing it into at least two sections around the rotation axis of the rotating section, and each divided section is formed with a uniform thickness, and at least one of the divided sections has a different thickness from the other divided sections that make up the liner. Another aspect of the first configuration of the present disclosure is characterized in that, in the above configuration, the dividing plate has a notch that allows a bolt connecting the swivel portion and the spindle ram to be inserted, and that allows the swivel portion and the spindle ram to be inserted into or removed from a predetermined location from the side while they are connected by the bolt. Another aspect of the first configuration of the present disclosure is characterized in that, in the above configuration, the liner is formed in a donut shape, and each of the divided plates is formed in an arc shape, and a plurality of the notches formed in the same divided plate are cut out in a U-shape parallel to each other in the same direction on the inside of the arc. Another aspect of the first configuration of the present disclosure is characterized in that, in the above configuration, the dividing plate has a notch for inserting an oil supply pipe disposed in the slewing section from the spindle ram, and the notch for inserting the oil supply pipe is also formed in a U-shape parallel to the notch for inserting the bolt. To achieve the above objective, the second configuration of this disclosure is a machine tool that processes a workpiece by connecting a swivel part to a spindle ram equipped with a rotating part, and is characterized by having the angle adjustment structure described in the first configuration. [Effects of the Invention]

[0008] According to the present invention, the mounting angle of the swivel section can be finely adjusted in a short period of time without the need to prepare a special setup. Moreover, since there is no need to manufacture a special liner, the adjustment can be done in an inexpensive manner. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view illustrating an example of an angle adjustment structure for a machine tool in an embodiment, applied to a gantry-type machining center. [Figure 2] This is an explanatory diagram of the liner; (a) is a plan view, and (b) is a cross-sectional view along line BB. [Figure 3] This is a front view of the spindle head connection section, enlarged from part A in Figure 1. [Figure 4] This is a front explanatory view showing another form of the angle adjustment structure and the internal structure of part A. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 shows an example of the angle adjustment structure of a machine tool according to the embodiment, and is a perspective view illustrating its application to a gantry-type machining center. In the gantry-type machining center M, a gantry-shaped column (none of which are shown) is positioned on a table located at the bottom. As shown in Figure 1, a cross rail 4 is provided on the column. A saddle 5 extending vertically (Z-direction) is positioned on the cross rail 4, and a spindle ram 3 equipped with a rotating part 7 is mounted on the saddle 5 so as to be able to move up and down. The lower end of the spindle ram 3 is equipped with a connecting part, to which a spindle unit 1 acting as a pivot part is detachably attached.

[0011] The spindle unit 1 includes a cylindrical fixed part 1a at the top for connecting to the spindle ram 3, a disc-shaped rotating plate 9 below which it pivots relative to the fixed part 1a, a U-shaped fork part 2 below which it rotates together with the rotating plate 9 around the C axis, and a spindle head 6 positioned between the fork parts 2 and supported to rotate freely around the B axis perpendicular to the C axis. The spindle head 6 is configured by attaching a tool 6b to the tip of the main body 6a of the spindle head 6 for rotating and machining the workpiece. A plate-shaped liner 10 is positioned between the swivel plate 9 and the fork section 2 to adjust the tilt of the spindle unit 1 relative to the spindle ram 3 (tilt relative to the C-axis). The liner 10 corrects the misalignment between the central axis of the spindle ram 3 and the central axis of the spindle unit 1. The spindle unit 1 rotates around the C-axis by the drive of the rotating section 7 housed in the fixed section 1a.

[0012] Figure 2 shows the liner 10 alone, where (a) is a plan view and (b) is a cross-sectional view along line BB. The liner 10 is a disc-shaped plate having the same outer shape as the fixing part 1a. Furthermore, the center is formed with a large opening, giving it a donut shape. This liner 10 is formed by dividing it into multiple dividing plates 11 (first dividing plate 11a to fourth dividing plate 11d) and combining them. In this case, it is formed by dividing it into four sections, and the liner 10 is formed using four arc-shaped dividing plates 11.

[0013] Each divided plate 11 has a notch 12 through which a bolt connecting the swivel plate 9 and the fork section 2 is inserted, allowing the liner 10 to be inserted from the side into a predetermined location even when the swivel plate 9 and the fork section 2 are connected by a bolt 13 (shown in Figure 3). The notch 12 is formed by cutting a U-shape in the same direction on the inside of the arc of each divided plate 11, and even when the swivel plate 9 and the fork section 2 are connected by a bolt 13, a gap is provided in the installation location that allows insertion / removal from the side. The liner 10 is formed by combining at least two different thicknesses of divided plates 11, as shown in Figure 2(b). By changing the thickness, the tilt of the spindle unit 1 is changed.

[0014] Furthermore, the four divided plates 11 presented here are all formed to be the same size (same shape) except for their thickness. The bolts 13 connecting the swivel plate 9 and the fork section 2 are positioned symmetrically with respect to the center of the swivel plate 9 and are connected at equal intervals, for example, by four bolts. Therefore, by reversing identical shapes, they can be applied to all parts. However, at least one plate has a different thickness; here, as shown in Figure 2(b), the fourth divided plate 11d is thicker than the first divided plate 11a. The second divided plate 11b and the third divided plate 11c are the same thickness as the first divided plate 11a. Multiple types of divider plates 11 with different thicknesses are available, and it is even possible to use plates of different thicknesses for all four plates that make up the liner 10.

[0015] Figure 3 is a front view illustrating the connection section of the spindle unit 1, enlarged from section A in Figure 1. As shown in Figure 3, the liner 10 is positioned between the swivel plate 9 and the fork section 2 of the spindle unit 1. Q indicates the central axis of the spindle unit 1 and shows it coinciding with the central axis (C axis) of the spindle ram 3. By combining divided plates 11 of different thicknesses to form the liner 10, the tilt of the spindle unit 1 can be corrected so that the central axis Q aligns with the central axis of the spindle ram 3.

[0016] Thus, by using the divided and formed liner 10, the mounting angle of the spindle unit 1, which is the swivel part, can be finely adjusted in a short period without preparing a dedicated setup. Moreover, since there is no need to produce a dedicated liner 10, it can be adjusted by an inexpensive method. Also, since the bolt insertion part of the liner 10 is formed as a notch 12 from the end of the dividing plate 11, even when the swivel plate 9 and the fork part 2 are connected by a bolt 13, the bolt 13 can be accommodated in the notch 12, and the dividing plate 11 can be arranged. Furthermore, since the plurality of notches 12 formed in one dividing plate 11 are formed in parallel, the dividing plate 11 can be inserted and removed with the swivel plate 9 and the fork part 2 connected by the bolt 13, and the liner 10 can be attached and detached without removing the spindle unit 1.

[0017] In addition, in the above embodiment, the mounting part of the liner 10 is between the swivel plate 9 and the fork part 2 of the spindle unit 1. However, the liner 1� can also be between the spindle ram 3 and the fixing part 1a, or further between the fork part 2 and the spindle head 6.

[0018] FIG. 4 shows another form of the angle adjustment structure and is a front explanatory view showing the internal structure of part A in cross section. Here, a configuration including an oil supply pipe that constitutes a flow path from the spindle ram 3 to the spindle unit 1 is shown, where 8 is the oil supply pipe and 8a is an oil path formed inside the fork part 2. When the oil supply pipe 8 is provided in this way and the oil path 8a is formed from the fixing part 1a to the fork part 2, in addition to the notch 12 through which the bolt 13 is inserted, a notch through which a pipe 14 attached to the oil path 8a is inserted may be further provided in the liner 10. And this notch may be formed in a U shape in parallel with the U-shaped notch 12.

[0019] In addition, in the present disclosure, the liner 10 is formed by combining four dividing plates 11. However, the number of divisions of the liner 10 is arbitrary, and it may be at least divided into two parts. If the liner 10 is formed with the two dividing plates 11 having different thicknesses, the inclination can be corrected. Furthermore, even if the liner 10 is composed of four divided plates 11, the shapes of each divided plate 11 may be different. Furthermore, although this disclosure has been explained using a gantry-type machining center as an example, when attaching a swivel section to a component on the machine tool body side, if the central axis of the component on the body side and the central axis of the swivel section are not aligned on the same line, the angle adjustment structure of this disclosure can be applied. By selecting a dividing plate 11 of an appropriate thickness to form a liner 10 and interposing it between the component on the body side and the swivel section, it is possible to align the central axes of both. [Explanation of symbols]

[0020] 1. Spindle unit (swivel section), 1a. Fixed section, 2. Fork section, 3. Spindle ram, 5. Saddle, 6. Spindle head, 7. Rotating section, 9. Swivel plate, 10. Liner, 11 (11a~11d). Dividing plate, 12. Notch, 13. Bolt, M. Gantry machining center (machine tool).

Claims

1. In a machine tool that processes a workpiece by connecting a swivel section to a spindle ram equipped with a rotating section, an angle adjustment structure is provided that adjusts the inclination of the swivel section relative to the spindle ram by inserting a plate-shaped liner between the spindle ram and the swivel section, or between the swivel section and the swivel section, An angle adjustment structure for a machine tool, characterized in that the liner is formed by dividing it into at least two parts around the rotation axis of the rotating part, and each divided part is formed with a uniform thickness, and at least one of the divided parts has a different thickness from the other divided parts that make up the liner.

2. The angle adjustment structure for a machine tool according to claim 1, characterized in that the dividing plate allows for the insertion of a bolt connecting the swivel section and the spindle ram, and has a notch that allows for insertion and removal from a predetermined location from the side while the swivel section and the spindle ram are connected by the bolt.

3. The angle adjustment structure for a machine tool according to claim 2, characterized in that the liner is formed in a donut shape, each of the division plates is formed in an arc shape, and the plurality of notches formed in the same division plate are cut out in a U-shape parallel to each other in the same direction on the inside of the arc.

4. The angle adjustment structure for a machine tool according to claim 3, characterized in that the dividing plate has a notch for inserting an oil supply pipe disposed in the slewing section from the spindle ram, and the notch for inserting the oil supply pipe is also formed in a U-shape parallel to the notch for inserting the bolt.

5. A machine tool for machining a workpiece by connecting a swivel section to a spindle ram equipped with a rotating section, characterized in that it is equipped with an angle adjustment structure according to any one of claims 1 to 4.

Images