JP3288452B2 - Tool head with built-in compensation mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool head of a machine tool, and more particularly to a tool for moving a spindle in a small amount in an axial direction according to wear of a tool attached to the tip of the spindle. The present invention relates to a tool head with a built-in correction mechanism capable of correcting the machining position of the tool head.

[0002]

2. Description of the Related Art In such a conventional tool head with a built-in correction mechanism, a quill is supported in a head frame so as to be movable in an axial direction, and a spindle is rotatably supported in the quill via a bearing. Have been. Further, a cylinder such as a hydraulic cylinder is mounted on the outside of the head frame, and a connecting body fixed to the piston rod is connected to the quill through a through hole on the head frame.

When the cylinder is operated in response to wear or the like of the tool attached to the tip of the spindle, the spindle is moved and adjusted in the axial direction together with the quill via the connecting member, and the machining of the tool on the workpiece is performed. The position can be corrected.

[0004]

However, in this conventional tool head, the cylinder is arranged outside the head frame, and the piston rod protrudes outside the head frame. Had the defect of becoming large. Further, since the linear motion of the cylinder is directly transmitted to the quill, there is a problem that the movement of the spindle cannot be finely and accurately adjusted.

Further, in this conventional tool head, since the connecting body fixed to the piston rod is connected to the quill through the through hole in the head frame, dust enters the head frame from the through hole, There was also a problem that the movement adjustment of the spindle was adversely affected.

The present invention has been made in view of such problems existing in the prior art. It is an object of the present invention to simplify the structure of the correction mechanism and reduce the size of the entire tool head. A compensating mechanism that can be configured and that can finely adjust the movement of the spindle and that can reliably prevent dust from entering the head frame and adversely affecting the adjustment of the movement of the spindle. It is to provide a built-in tool head.

[0007]

In order to achieve the above object, a tool head with a built-in correction mechanism according to the present invention is provided so as to be rotatable in a closed head frame and to be finely movable in an axial direction. A spindle that is supported and has a tool attached to the tip, an internal screw fixed in the head frame so as to have the same center as the spindle, and screwed with the internal screw in a state capable of absorbing backlash. A feed screw rotatably fitted on the outer periphery of the spindle via a thrust bearing made of a ball bearing, and a head frame for rotating the feed screw.
Provided in the system and provided with rotation applying means connected to the feed screw, and measuring the outer diameter of the tool, and according to the size,
By rotating the rotation applying means, the feed screw
The spindle moves back and forth based on the action on the inner screw
It is characterized by moving .

[0008]

[Work] In a tool head with a built-in correction mechanism configured as described above, when the feed screw is rotated by rotation applying means in accordance with wear of the tool, the feed screw is moved forward and backward by the action of the screw. Thus, the spindle is finely moved and adjusted in the axial direction. Therefore, the movement of the spindle can be finely adjusted by a correction mechanism having a simple structure. Further, since there is no need to provide a through hole or the like in the head frame, it is possible to reliably prevent the possibility that dust enters the head frame and adversely affects the adjustment of the movement of the spindle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tool head with a built-in correction mechanism embodying the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a head frame 1 is hermetically formed by a cylindrical casing 2 and a pair of end plates 4 and 5 attached to both ends of the casing 2 via packings 3. Have been. The spindle 6 is supported in the head frame 1 via a pair of radial bearings 7 so as to be rotatable and capable of adjusting a small amount of movement in the axial direction, and a cutting tool 8 is detachably attached to a tip of the spindle 6. The toothed pulley 9 is fixed to the base end of the spindle 7, and the spindle 6 is rotated via the toothed belt 10 and the toothed pulley 9 by the rotation of a driving motor (not shown), and the workpiece W is cut by the tool 8. Is done.

The internal screw 15 is fixed in the head frame 1 by a plurality of screws 16 and is coaxial with the spindle 6. The cylindrical feed screw 11 is screwed with the inner screw 15 in the head frame 1. The feed screw 15 is rotatably fitted to the outer periphery of the spindle 6 via a pair of thrust bearings 12, and a driven gear 13 is fixed to an end of the feed screw 15 by a plurality of screws 14.

The internal screw 15 is provided with a first internal screw 17.
And the second internal screw 18. These screws 17, 18 are assembled and fixed by a plurality of screws 20 with a spacer 19 interposed between the internal screws 17, 18. Then, by tightening the screw 20 in a state where the feed screw 11 is screwed to the inner screw 15, looseness and backlash between the feed screw 11 and the inner screw 15 are absorbed. .

The support cylinder 21 is fixedly penetrated to the end plate 5 of the head frame 1 through a packing 22 and has a step motor 23 which constitutes a rotation applying means on its outer surface.
Is attached. The drive gear 24 is rotatably supported in the support cylinder 21 through a pair of radial bearings 25 so as to mesh with the driven gear 13, and a motor shaft 26 of a step motor 23 is fitted and fixed to the shaft end thereof. ing.

Next, the operation of the tool head with the built-in correction mechanism configured as described above will be described. In the case of cutting the work W in the tool head of this embodiment, the tool 8 attached to the tip of the spindle 6 is arranged at a predetermined machining position facing the work W. In this state, when a driving motor (not shown) is rotated, the spindle 6 is rotated via the toothed belt 10 and the toothed pulley 9, and the workpiece W is cut by the tool 8.

When the tool 8 is worn due to the cutting, and it becomes necessary to correct the machining position of the tool 8 with respect to the workpiece W, the outer diameter of the tool 8 is measured, and the size of the outer diameter is measured. The step motor 23 is rotated in either the forward or reverse direction by a corresponding amount. Then, the feed screw 11 is rotated via the driving gear 24 and the driven gear 13, and the inner screw 15 is rotated.
The feed screw 11 is moved forward and backward by the action of. Thereby, the spindle 6 is moved and adjusted by a very small amount in the axial direction, and the processing position of the tool 8 with respect to the workpiece W can be corrected.

As described above, in the tool head of this embodiment, since the correcting mechanism is constituted by the feed screw 11 and the inner screw 15 and is arranged in the head frame 1, the structure of the correcting mechanism is simple. Thus, the entire tool head can be made compact. In addition, since the movement of the spindle 6 is adjusted by reducing the rotation of the stepping motor 23 by a screw mechanism and converting it into linear movement, the spindle 6 is rotated.
Can be finely and accurately adjusted. Also,
Since the adjusting mechanism such as the feed screw 11 and the inner screw 15 is provided in the head frame 1, unlike the case where the adjusting mechanism is provided outside the head frame, it is necessary to provide a through hole or the like in the head frame 1. Absent. Therefore, it is possible to reliably prevent dust from entering the head frame 1 through the through-hole and adversely affecting the movement adjustment of the spindle 6.

The present invention is not limited to the configuration of the above-described embodiment. For example, instead of the stepping motor 23 of the above-described embodiment, a manually operated handle as a rotation imparting means is provided at the shaft end of the driving gear 24. The configuration of each part can be arbitrarily changed and embodied without departing from the spirit of the present invention, for example, by fitting.

[0018]

According to the present invention, as described above, the structure of the correction mechanism is simple, the entire tool head can be made compact, and the adjustment of the movement of the spindle can be performed delicately and accurately. Can be done, and
This provides an excellent effect that it is possible to reliably prevent dust from entering the head frame and adversely affecting the movement adjustment of the spindle.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a tool head with a built-in correction mechanism embodying the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Head frame, 6 ... Spindle, 8 ... Tool, 11
... a feed screw, 12 ... a thrust bearing, 13 ... a driven gear, 15 ... an internal screw, 23 ... a step motor constituting a rotation applying means, 24 ... a drive gear.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 5/32 B23Q 3/12

Claims (1)

(57) [Claims] 1. A spindle rotatably supported in a closed head frame and capable of being slightly moved in an axial direction, and having a tool attached to a tip thereof, and a spindle in a head frame having the same center as the spindle. An internal screw fixed to the inner screw; a feed screw which is screwed with the inner screw in a state capable of absorbing backlash, and which is relatively rotatably fitted to the outer periphery of the spindle via a thrust bearing composed of a ball bearing ; Installed in the head frame to rotate the feed screw
Provided with rotation applying means connected to the feed screw ,
Measure the outer diameter of the tool, and rotate the tool according to the size.
By rotating the applying means, the inner side of the feed screw
A tool head with a built-in correction mechanism, wherein the spindle moves forward and backward based on an action on a wedge.