JPH047868Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to an angular attachment that is attached to the main shaft of a machine tool and incorporates a spindle that can be set at any angle of inclination with respect to the main shaft. .

<Conventional technology> In large machine tools such as double-column machining centers and horizontal boring and milling machines that perform mold machining that requires machining of complex shapes, their main axes are always set in a fixed direction. The direction of the main axis cannot be changed freely.

Therefore, when a workpiece is machined using a machine tool such as the one described above, it is required to change the posture of the workpiece to be machined as necessary. However, when machining workpieces whose posture is difficult to change due to handling constraints or extremely heavy workpieces, the direction of the tool must be changed as necessary while the workpiece is fixed. The specified processing must be carried out.

For this purpose, a machine tool has been proposed in which the main axis can be set at an arbitrary inclination angle.
As shown in FIG. 2, which schematically shows the structure of the main parts of an example of such a conventional machine tool, a spindle head 102 that can horizontally move left and right along a cross rail 101 is shown.
A rotating cylinder 104 that can be indexed and rotated via a bearing 103 is rotatably attached to the cylinder, and a cylinder driving motor 106 that indexes and rotates the rotating cylinder 104 via a gear transmission mechanism 105 is provided on the spindle head 102. It is being

A main shaft 108 that is driven and rotated by a main shaft drive motor 107 mounted on the upper end of the main shaft head 102 is rotatably incorporated in the center of the rotating cylinder 104 . Furthermore, this main shaft 1 is located inside the rotating cylinder 104.
An attachment shaft 109 parallel to 08 is rotatably provided, and this attachment shaft 109
is mounted on the upper end of the spindle head 102 and driven and rotated by an attachment drive motor 110.

An angular unit 111 is integrally fixed to the lower end of the swing cylinder 104, and a swing shaft 112 that is orthogonal to the main shaft 108 is rotatably provided within the angular unit 111. Further, a spindle 113 that is orthogonal to this swing shaft 112 and to which a tool (not shown) is attached to the lower end is connected to the main shaft 108 via a gear transmission mechanism 114.
Similarly, the lower end of the attachment shaft 109 is connected to the swing shaft 112 via a gear transmission mechanism 115.

<Problems to be solved by the invention> The conventional device shown in FIG. Since the inclination of the spindle 113 around the axis 112 is changed, the attachment axis 1
This tends to cause insufficient rigidity of the spindle 113, and it is not possible to increase the machining capacity much with the spindle 113 tilted.

In addition, since the cylinder drive motor 106 that indexes and rotates the angular unit 111 around the main shaft 108 protrudes to the side of the angular unit 111, accessibility to the workpiece may be significantly impaired depending on the machining posture. This may cause inconvenience.

<Purpose of the invention> The present invention is a highly rigid and compact angular head that is detachably fixed to the main shaft of a machine tool that can be indexed and rotated, and that incorporates a spindle that can be set at any tilt angle with respect to the main shaft. The purpose is to provide the following.

<Means for Solving the Problems> The angular attachment according to the present invention includes a cylindrical attachment body whose base end is removably fixed to the main shaft of a machine tool that can index and rotate, and the main shaft. a spindle case that is swingably supported on the distal end of the attachment body through orthogonal swing axes; and a spindle case that is housed in the proximal end of the attachment body and that rotates the spindle case about the swing axis. a motor for rotating the case; a power transmission means that is incorporated in the attachment body and transmits the driving force of the motor for rotating the case to the spindle case; A spindle that is attached and has a tool detachably attached to its tip, and a spindle drive motor that has a rotor and a stator that are incorporated between the spindle and the spindle case, and that drives and rotates the spindle. It is equipped with the following.

<Operation> By supplying power to the stator of the spindle drive motor, the spindle with a tool attached to its tip rotates at high speed relative to the spindle case.
Process the workpiece.

The inclination of the spindle with respect to the workpiece is transmitted to the spindle case via a power transmission means by driving the case rotation motor, and is arbitrarily set by rotating the spindle case around the swing axis.

Further, the direction of the spindle can be arbitrarily set by indexing and rotating the main shaft of the machine tool, so that the attachment body is indexed and rotated integrally with the main shaft.

<Example> As shown in FIG. 1, which shows a schematic cross-sectional structure of an example in which the angular attachment according to the present invention is attached to the ram head of a portal machine tool, a ram head 12 is provided with a main shaft 11 rotatably provided. An annular fixing coupler 13 is detachably fixed to the lower end of the holder. A cylindrical attachment body 15 is attached to the fixing coupler 13 via a bearing 14.
The upper end portion of the main shaft 11 is connected to be relatively rotatable, and the lower end portion of the main shaft 11 is connected to a power transmission coupler 16 formed at the upper end of the attachment main body 15. The main body 15 also rotates integrally with the main body 15.

A cylindrical spindle case 18 having a swing shaft 17 projecting from its outer periphery that is perpendicular to the main shaft 11 is housed at the tip of the attachment body 15 .
A bearing 19 is interposed between the attachment body 15 and the swing shaft 17.
As a result, the spindle case 18 is rotatable about the swing shaft 17 relative to the attachment body 15.

A sector gear 20 coaxial with the swing shaft 17 is fixed to the upper end of the spindle case 18, and a spur gear 21 that meshes with the sector gear 20 is rotatably assembled within the attachment body 15. Further, a case rotation motor 22 such as an AC servo motor for rotating the spindle case 18 about the swing shaft 17 is connected to the base end side (upper end side in the figure) of the attachment body 15 via a bracket 23. The case rotation motor 22 is housed and fixed coaxially with the main shaft 11.
A driven bevel gear 25 meshing with a driving bevel gear 24 of the attachment body 15 is parallel to the swing shaft 17.
The transmission shaft 26 is fixed to one end side of a transmission shaft 26 rotatably housed therein. A transmission gear 27 that meshes with the spur gear 21 is provided on the other end side of the transmission shaft 26.
is fixed.

Therefore, when the case rotation motor 22 is operated to drive and rotate the drive bevel gear 24, the rotational force is transmitted from the driven bevel gear 25 to the sector gear 20 via the transmission gear 27 and the spur gear 21, and A spindle case 18 is adapted to rotate about a shaft 17.

Note that in this embodiment, the sector gear 20 and the spur gear 2
1. The drive bevel gear 24, the driven bevel gear 25, the transmission gear 27, etc. constitute the power transmission means of the present invention.

On the other hand, in the center of the spindle case 18, a tool (not shown) is removably attached to the lower end, and a spindle 28, which is orthogonal to the swing shaft 17, is rotatably attached via a bearing 29. A rotor 30 is integrally fitted into the spindle 28, and an annular stator 31 surrounding the rotor 30 is fitted into the inner wall of the spindle case 18. This constitutes the main part of the spindle drive motor 32. A power supply cable 33 drawn into the attachment body 15 from the outside is connected to the stator 31 of the spindle drive motor 32, and by passing current through the power supply cable 33 to the stator 31, the spindle 28 is adapted to be driven and rotated.

As described above, in this embodiment, the spindle 28 is driven by the spindle drive motor 32 built into the spindle case 18, while the tilting of the spindle 28 is controlled by the case rotation motor 22 housed in the attachment body 15. This is done via the sector gear 20, the spur gear 21, the drive bevel gear 24, the driven bevel gear 25, and the transmission gear 27.
These drive systems can be set to have high rigidity.

Furthermore, the direction of the attachment body 15 is adjusted to the main axis 1.
This is done by index rotation of 1, and in combination with the built-in drive system mentioned above, the angular attachment can be made very compact.

<Effect of the invention> According to the Anguilla attachment of this invention,
Since the case rotation motor and power transmission mechanism for changing the spindle inclination are housed in the attachment body that is attached to the main shaft of the machine tool, the rigidity of the spindle oscillation mechanism is improved compared to conventional ones. It is possible to improve the processing ability when the spindle is tilted.

In addition, since the attachment itself is oriented by indexing and rotating the main shaft, the angular attachment itself can be made more compact by housing the case rotation motor and the power transmission mechanism within the attachment body. This allows for improved access to the workpiece, allowing more complex machining to be performed without difficulty.

Furthermore, by using this angular attachment, it has become possible to significantly expand the processing form and processing area of conventional machine tools.

[Brief explanation of the drawing]

Fig. 1 is a sectional view schematically showing the internal structure of an embodiment of the angular attachment according to the present invention, and Fig. 2 shows the main parts of an example of a conventional machine tool capable of changing the direction of the tool. FIG. 3 is a perspective view showing the drive mechanism in a transparent state. Also, in the figures, 11 is the main shaft, 12 is the ram head, 13 is the fixing coupler, 14, 19, 29 are the bearings, 15 is the attachment body, 16 is the power transmission coupler, 17 is the swing shaft, and 18 is the spindle. Case, 20 is a sector gear, 21 is a spur gear, 22 is a case rotation motor, 23 is a bracket, 24 is a drive bevel gear, 25 is a driven bevel gear, 26 is a transmission shaft, 2
7 is a transmission gear, 28 is a spindle, 30 is a rotor, 31 is a stator, 32 is a spindle drive motor, and 33 is a power supply cable.

Claims (1)

[Scope of utility model registration request] A cylindrical attachment body whose base end is removably fixed to the main shaft of a machine tool that can be indexed and rotated; a spindle case that is pivotally supported; a case rotation motor that is housed on the proximal end side of the attachment body and rotates the spindle case around the swing axis; and a case rotation motor that is built into the attachment body and that rotates the case. a power transmission means for transmitting the driving force of the motor to the spindle case; a spindle rotatably attached to the spindle case in a state perpendicular to the swing axis and having a tool detachably attached to the tip thereof; and the spindle. and a spindle drive motor that has a rotor and a stator incorporated between the spindle case and the spindle case, and drives and rotates the spindle.