JPH0644579Y2 - Swivel head clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a clamp device for an attachment head of a machine tool having one or more axes of rotation, and in particular, a swivel head incorporated in the attachment head. The present invention relates to a swivel head clamp device capable of improving the thrust rigidity of the.

(Prior Art) When a swivel head incorporated in an attachment head of a machine tool having one or more axes of rotation is rotatably supported by a double-supported structure, usually, a rotation shaft portion of the swivel head is rotatably supported by a bearing. In this case, since the thrust rigidity of the swivel head is determined by the thrust rigidity of the bearing, it is necessary to use a bearing having a large thrust load capacity in order to improve the thrust rigidity. Also, in the case of a double-supported structure, it suffices if a bearing that can obtain thrust rigidity equivalent to the left and right can be used,
Due to the size of attachment heads, functional restrictions, etc., it is often the case that one bearing has a smaller thrust load capacity than the other.

In order to solve this problem, a method has been proposed in which a clamp rod penetrating both rotating shafts of the swivel head is provided and the clamp rod is hydraulically moved in the axial direction to tighten the entire swivel head (Japanese Patent Publication No.
58-28043).

(Problems to be solved by the invention) In such a method of hydraulically tightening the entire swivel head, the spindle itself which is rotatably supported in the swivel head in a direction orthogonal to the rotation axis of the swivel head also rotates. Since it is moved in the axial direction, there is a problem in that the spindle is misaligned.

The present invention has been made in consideration of such problems, and an object thereof is to provide a clamp device for a swivel head capable of improving thrust rigidity of the swivel head without causing misalignment of the spindle. To do.

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a swivel head including a bearing portion that rotatably supports a spindle and a rotary shaft that extends in a direction orthogonal to the axis of the spindle. In the clamp device, the clamp device is formed at one end of a swivel head casing that swingably holds a swivel head, and the piston member is slidably inserted therein. Cylinder part,
It is characterized by comprising a hydraulic circuit for supplying pressure oil into the cylinder portion.

(Operation) In the present invention, the hydraulic pressure is applied to the rotary shaft in the axial direction by using the piston member fitted to one end of the rotary shaft.
This oil pressure is made to act so as not to move the rotary shaft,
It acts as an inner part that supports a unidirectional thrust load applied to the rotating shaft between itself and the main body.

As a result, the thrust rigidity of the swivel head can be improved without causing misalignment of the spindle rotatably supported by the swivel head.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view showing an embodiment of the present invention. Sign
Reference numeral 11 denotes an attachment head main body that is used by being attached to a ram (not shown) of a machine tool, and the attachment head main body also serves as a swivel head casing that rotatably holds the swivel head. The swivel head casing 11 is attached to the main body of the machine tool so as to be rotatable around a main body side spindle 12. In the swivel head casing 11, a swivel head 13 is arranged so as to be swingable about an axis line orthogonal to the axis line of the main shaft 12.

The swivel head 13 rotates two rotating shafts 13a and 13b connected on the same axis whose both ends are rotatably supported by the swivel head casing 11 and a spindle 14 arranged orthogonal to the rotating shafts 13a and 13b. Two bearings that hold it as much as possible
It has 13c and 13d.

Between the bearing portions 13c, 13d of the swivel head 13 and the swivel head casing 11, a curbic coupling 15 for fixing the swivel head 13 at a predetermined indexing position is arranged.

The spindle 14 is adapted to be rotationally driven by the main body side spindle 12 of the machine tool via a gear train arranged in the swivel head casing 11. Also swivel head
13 is also indexing driven by a swivel head indexing drive mechanism 17 attached to the swivel head casing 11.

A swivel head main clamp piston 21 is fitted to one end of the rotary shaft of the swivel head 13, and the main clamp piston 21 is slidably inserted into a cylinder portion 22 provided in the swivel head casing 11. ing. Also,
The swivel head casing 11 is provided with an oil supply passage 23 for supplying pressure oil into the cylinder portion 22.

Further, a swivel head slave clamp piston 31 is fitted to one end of the other rotary shaft 13b of the swivel head 13, and the slave clamp piston 31 is provided on the opposite side of the swivel head casing 11 from the cylinder portion 22. It is slidably inserted into the provided cylinder part 32. An oil supply passage 33 for supplying pressure oil is connected to the cylinder portion 32.

Next, the operation of this embodiment having such a configuration will be described.

The swivel head 13, which has been disengaged from the curvic coupling 15 and rotationally indexed to a predetermined position by the indexing drive mechanism 17, supplies pressure oil from the oil supply passage 23 into the cylinder portion 22 to provide a main clamp. By moving the piston 21 for use and engaging the curvic coupling 15 again,
It is fixed at the index position.

The piston 31 is lightly contacted at its inner end (end on the piston 31 side) with the end face A in the cylinder portion 32 without a gap when the curvic coupling 15 is meshingly engaged as described above. There is. In this state, when pressure oil is supplied from the oil supply passage 33 into the cylinder portion 32, the piston 31 does not move the swivel head 13 in the axial direction, and the cylinder portion 32 does not move.
Is pressed against the end surface A of the swivel head (internal force) and swivel head 13
Is clamped.

After the swivel head 13 is clamped in this way, a cutting tool (not shown) mounted on the spindle 14 is used for cutting. When a thrust load is applied to the swivel head 13 in the direction of arrow X via the cutting tool, this thrust load is applied by the hydraulic pressure acting on the main clamp piston 21 and the hydraulic pressure acting on the slave clamp piston 31. On the contrary, when a thrust load acts in the direction of the arrow Y, the load is applied by the end surface A of the cylinder portion 32 with which the curvic coupling 15 and the secondary clamp piston 31 are in contact.

As described above, according to the present embodiment, the swivel head 13 does not receive the thrust load direction only on the main body 11a on the curb coupling side, but is also clamped on the main body 11b on the opposite side, which causes misalignment of the spindle 14. Without increasing the thrust rigidity of the swivel head 13.
Thereby, the cutting rigidity of the attachment head having the swivel head 13 incorporated therein can be enhanced.

FIG. 2 is a schematic sectional view showing another embodiment of the present invention.

The one shown in FIG. 2 does not use a curvic coupling for fixing the indexing position of the swivel head, but can perform cutting while swinging the swivel head. In the figure, reference numeral 41 is a swivel head casing.
Two rotary shafts 42a, 42b connected on the same axis line in 41
The swivel head 42 having a bearing portion (not shown) for rotatably supporting the spindle 43 in a direction orthogonal to the rotary shafts 42a, 42b swings the rotary shafts 42a, 42b by bearings 44a, 44b. It is arranged so as to be held pos- sibly.

Of the rotary shafts 42a, 42b, a piston 45 is fitted to the end of the rotary shaft 42b on the bearing 44b side having a small thrust load capacity.
It is slidably inserted in the cylinder portion 46 provided in the. An oil supply passage 47 for supplying pressure oil is connected to the cylinder portion 46.

Next, the operation of this embodiment having such a configuration will be described.

After the swivel head 42 is assembled in the swivel head casing 41 and all the centering work is completed, the end surface of the piston 45 on the spindle 43 side is lightly contacted with the end surface B in the cylinder portion 46 without any gap. Adjust the fitting position of.

When pressure oil is supplied from the oil supply passage 47 into the cylinder portion 46 in this state, the piston 45 is brought into contact with the end surface B and the swivel head 42 is clamped. This also functions as the action of braking the swing of the swivel head 42 by the piston 45, and this braking action can be adjusted by the hydraulic pressure supplied to the cylinder portion 46.

When a thrust load acts on the swivel head 42 in the arrow X direction during the cutting process, the thrust load is applied by the hydraulic pressure acting on the piston 45 together with the bearings 44a and 44b. Conversely, when a thrust load acts in the direction of arrow Y, this thrust load is applied to the bearings 44a, 44
Along with b, the cylinder part 46 against which the piston 45 is abutted
Is loaded by the end face B of the.

As described above, according to the present embodiment, the swivel head 42 is clamped in the thrust load direction, and the thrust load load capacity can be improved without causing misalignment of the spindle 43.

[Effect of device]

As described above, according to the present invention, the thrust rigidity of the swivel head can be improved without causing misalignment of the spindle. Further, the piston can be used as a brake mechanism in the swing rotation direction of the swivel head.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention, and FIG. 2 is a schematic vertical sectional view showing a second embodiment of the present invention. 13,42 …… Swivel head, 13a, 13b, 42a, 42b …… Rotary shaft, 13c, 13d …… Bearing part, 31,45 …… Piston, 32,46…
… Cylinder part, 33,47 …… Oil supply path.

Claims (1)

[Scope of utility model registration request] 1. A clamp device for a swivel head, comprising a bearing portion that rotatably supports a spindle, and a rotary shaft that extends in a direction orthogonal to the axis of the spindle.
The clamp device includes a piston member fitted to one end of the rotating shaft, and a cylinder formed at one end of a swivel head casing that swingably holds the swivel head, and into which the piston member is slidably inserted. A swivel head clamp device comprising: a cylinder section; and a hydraulic circuit for supplying pressure oil into the cylinder section.