JPH04223833A - Tool holder clamping device - Google Patents

Abstract

PURPOSE:To fix a tool holder securely at a specific position, when a non- rotational cutting tool is installed to the tool holder to which a rotational cutting tool is installed in the normal condition, and a cutting process such as a groove cutting is carried out by installing the holder to the spindle of a machine tool and moving a work while fixing the spindle. CONSTITUTION:A holder main body 1 installed to a spindle 2, an attaching ring 8 furnishing an engaging recess 15 at the peripheral surface and installed rotatable to the outside of the holder main body 1, and a clamp shaft 10 whose top engaging shaft 11 is wedge-engaged removable to the above engaging recess 15 by an air cylinder 13 provided to a fixing part 12, are provided. A circular groove 14 is formed on the peripheral surface of the holder body 1, plural screw holes 16 are engraved in the attaching ring 8, screws 18 furnishing engaging parts 17 at the tops are screwed in the screw holes 16, and the engaging parts 17 are wedge-engaged to the above circular groove 14.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a tool holder clamping device for clamping a tool holder attached to the spindle of an NC machine tool by a manipulator of an automatic tool changer, and the present invention relates to a tool holder clamping device for clamping a tool holder attached to the spindle of an NC machine tool by a manipulator of an automatic tool changer. It is used when a non-rotating cutting tool such as a grooving shaper is attached to the holder, and cutting operations such as grooving are performed while moving the workpiece in a straight line with the spindle fixed.

0002

[Prior Art] When a non-rotating cutting tool is attached to a tool holder as described above, this holder is attached to a spindle, and cutting is performed while moving a workpiece with the spindle fixed, conventionally, a tool holder is used. There is no particular device for clamping the tool holder, but the only thing to do is to engage the stopper piece provided at the tip of the spindle to prevent the holder from rotating into the axial notch groove provided in the manipulator gripping flange of the tool holder. The above-described cutting process is performed with the tool holder prevented from rotating relative to the spindle, and the spindle fixed by the braking action of the rotary drive device.

0003

[Problems to be Solved by the Invention] However, as in the above conventional method, the tool holder is fixed by simply engaging the stopper piece on the spindle side into the notch groove on the holder side and integrally connecting the tool holder to the spindle. In this method, there is usually a slight gap in the rotation direction between the stopper piece and the notch groove, which creates play and wobble on the tool holder side. It could not be fixed securely.

The problem to be solved by the present invention is to make it possible to securely fix a tool holder in a fixed position.

[0005]

[Means for Solving the Problems] The present invention solves the above problems and has the following configuration.

That is, the holder main body is attached to the spindle of a machine tool and has an engaging recess on its outer circumferential surface, and the engaging shaft at the tip is moved into the engaging recess by means of a clamp shaft driving means provided on a fixed part of the machine tool. The clamp shaft is detachably wedge-engaged with the clamp shaft.

Further, a related invention (claim 2) includes a holder body that is attached to a spindle of a machine tool, and an engagement recess on the outer peripheral surface, which is rotatably fitted onto the front side of a flange for gripping a manipulator in the holder body. and a clamp shaft whose tip end is removably wedge-engaged with the engagement recess by a clamp shaft driving means provided on a fixed part of the machine tool. An annular groove is provided on the outer peripheral surface on which the mounting ring is externally fitted, and a plurality of threaded holes are formed through the mounting ring at required intervals in the circumferential direction, and each threaded hole has an engaging portion at the tip. A screw having a screw is screwed in so that its engaging portion is wedge-engaged with the annular groove.

Since the engaging shaft portion of the clamp shaft and the engaging recessed portion of the mounting ring are wedge-engaged, the engaging shaft portion may have a tapered shape, that is, a truncated conical shaft portion, or An example of the engagement recess is one in which at least the inner wall surface facing the mounting ring in the circumferential direction is formed in a tapered shape corresponding to the taper of the engagement shaft.

[0009] Furthermore, the tip engaging portion of the screw tool is preferably tapered, that is, in the shape of a truncated cone, and the annular groove in which this engages in wedge engagement is formed at least on the flange of the opposing inner wall surfaces of the groove. It is preferable that the inner wall surface farther from the part side is formed in an inclined shape corresponding to the taper of the tip engaging part.

[0010] As the clamp shaft driving means, a fluid pressure cylinder is preferable, and for example, an air cylinder can be used. In this case, a clamp shaft is connected to the piston rod of the cylinder.

[0011]

[Operation] According to the specific invention, the holder body is gripped by a manipulator of an automatic tool changer with the engagement recess provided in the holder body aligned so as to correspond to the engagement shaft portion at the tip of the clamp shaft, and the spindle is rotated. Then, by operating the clamp shaft drive means, the engagement shaft at the tip of the clamp shaft enters the engagement recess of the holder body and engages in a wedge, so that the holder body is fixed to the machine tool by the wedge action. It is fixed without any movement or rattling.

According to the related invention, a mounting ring is fitted onto the holder body, and with screws loosely screwed into each screw hole of the ring, the holder body is gripped by a manipulator of an automatic tool changer. Attach it to the spindle,
Then, the engagement recess on the outer peripheral side of the attachment ring is rotated to align with the engagement shaft at the tip of the clamp shaft. When the engagement shaft and the engagement recess are aligned and each screw is tightened to wedge the engagement shaft into the engagement recess, the wedge action causes the mounting ring to move into the holder body. The mounting ring is pressed against the flange end face of the mounting ring, thereby integrally fixing the mounting ring to the holder body. When the clamp shaft driving means is actuated to insert the engagement shaft at the tip of the clamp shaft into the engagement recess of the mounting ring that is integrally fixed to the holder body, the engagement shaft at the tip of the clamp shaft enters into wedge engagement. The holder body is integrally coupled with the mounting ring, whereby the holder body is fixed to a fixed part of the machine tool via the mounting ring, the clamp shaft, and the clamp shaft driving means.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the tool holder clamping device according to the present invention will be described with reference to FIGS. 1 to 4.

In FIGS. 1 to 3, reference numeral 1 denotes a holder body that is attached to a spindle 2 of a machine tool, and a chuck part 4 is provided at the tip of the holder body for fixing a non-rotating cutting tool 3 such as a groove shaper. A tapered shank portion 6 that fits into the tapered hole portion 5 of the spindle 2 is formed on the end side, and a flange 7 for gripping the manipulator is formed on the intermediate portion. 8 is a mounting ring that is rotatably fitted onto the outer circumferential surface 9 on the front side of the flange 7 in the holder body 1; 10 is a clamp shaft having an engagement shaft portion 11 at the tip;
It is interlocked and connected to an air cylinder 13 as a clamp shaft driving means attached to a fixed part 12 of the machine tool, so that it can move near and far with respect to the outer peripheral surface of the mounting ring 8.

[0015] To explain the above structure in more detail,
An annular groove 14 is provided around the outer peripheral surface 9 of the holder body 1 on which the mounting ring 8 is externally fitted, and the opposing inner wall surfaces 19 and 20 of the annular groove 14 expand outward. It is formed in a sloping shape. As shown in FIG. 3, the mounting ring 8 that is fitted externally has a
Engagement recesses 15 that are wedge-fitted to the engagement shaft portion 11 of the clamp shaft 10 in a detachable manner are provided at the locations, and a plurality of engagement recesses ( For example, three screw holes 16 are provided therethrough.

As is clear from FIGS. 1 to 3, the engagement recess 15 is a notch groove cut out from one end surface of the mounting ring 8 and has a substantially U-shape in plan view. The inner wall surfaces 21, 21 facing each other in the circumferential direction of the mounting link 8 are formed in a tapered shape that expands outward, and the groove inner wall surface portion of the engagement recess 15 also has an inclined surface shape corresponding to the taper. (See Figure 1). The engagement shaft portion 11 of the clamp shaft 10 that is wedge-engaged with the engagement recess 15 is formed into a truncated conical shape with a taper corresponding to the taper of the inner wall surfaces 21, 21.

A screw tool 18 having an engaging portion 17 at its tip is screwed into each screw hole 16 of the mounting ring 8, and the engaging portion 17 is wedge-engaged with the annular groove portion 14. The engaging portion 17 is formed into a truncated conical shape with a taper corresponding to the inclined inner wall surfaces 19 and 20 of the annular groove portion 14 .

[0018] Thus, the mounting ring 8 is attached to the holder main body 1.
To attach and fix the mounting ring 8 to the top, fit the mounting ring 8 onto the outer peripheral surface 9 of the holder main body 1 from the front side, with the rear end surface of the mounting ring 8 in contact with the front end surface 22 of the flange 7. Each screw 18 is screwed into each screw hole 16, and while the tapered engagement portion 17 at the tip is slidably engaged with the inclined inner wall surface 19 farther from the flange 7, as shown in FIG. When tightened, the tapered engagement portion 17
Due to the wedge action of the inclined inner wall surface 19, the mounting ring 8 is drawn toward the flange 7, and the rear end surface of the mounting ring 8 is strongly pressed against the end surface 22 of the flange 7, whereby the mounting ring 8 is attached to the holder main body. It will be fixed at a fixed position on 1.

Note that when each screw 18 is screwed into each screw hole 16 and the tip engaging portion 17 engages with one inclined inner wall surface 19 of the annular groove 14, this engaging portion 17 and the other inclined inner wall surface 19 so that there is a slight gap. Each screw 18 is provided with a rotary operating tool engagement hole 23 on its base end side, as shown in FIG. It is now possible to remove it.

As is clear from FIG. 1, the air cylinder 13 as a driving means has a cylinder body 24 attached to the fixed part 12 of the machine tool via a mounting base 25, and the cylinder body 24
A piston 27 is disposed in the vertical cylinder chamber 26 of No. 4 so as to be able to slide up and down, and the upper chamber 28 of the cylinder chamber 26 is used as an air chamber, and the lower chamber 29 is equipped with the piston 27 and the cylinder body 2.
A coil spring 30 is interposed between the piston rod 36 and the piston rod 36, and the clamp shaft 10 is integrally connected to the lower end of the piston rod 36.

Therefore, according to this air cylinder 13, when pressurized air is supplied from the air supply pipe 31 to the upper chamber 28 of the cylinder chamber 26, the piston 27 is moved by the coil spring 30.
As a result, the clamp shaft 10 moves downward from the position shown by the dashed dot line in FIGS. When the piston 27 is engaged with the mating recess 15 and the holder main body 1 is fixed, and the pressure air is exhausted, the piston 27 is pushed up by the coil spring 30 and the engaging shaft portion 1 of the clamp shaft 10 is pushed up.
1 is detached from the engagement recess 15, and the fixation of the holder main body 1 is released.

[0022]Furthermore, a flange 7 for gripping the manipulator is provided.
has a pair of axial notch grooves 32 on both sides in the diametrical direction,
32 are provided, and these pair of notch grooves 32,
The stopper pieces 33, 33 that can be engaged with the spindle 2
protruding from the tip surface of the The chuck part 4 for fixing the non-rotating cutting tool includes, for example, a split collet 34 inserted into the tip of the holder body 1, and a fastener that engages with this collet 34 and is screwed into the tip of the holder body 1. With nut 35
It is more than that.

Next, the manner of use of the tool holder clamp device having the above-described structure will be explained.

First, the holder body 1 with the required non-rotating cutting tool 3 mounted thereon is placed on the manipulator (
(not shown) and attach it to the spindle 2. When attaching the holder body 1 to the spindle 2, the tapered shank portion 6 of the holder body 1 is attached to the spindle 2.
Before inserting into the taper hole 5 of the holder body 1, the notch groove 32 of the flange 7 of the holder main body 1 held by the manipulator and the stopper piece 3 on the spindle 2 side that engages therein are inserted.
In order to align with the stopper piece 33, the spindle 2 is driven and rotated several times by the spindle drive device on the machine tool side, and a position detection sensor (not shown) is used to align the stopper piece 33.
At the time of alignment, the spindle 2 is braked and locked by its drive device, and then the taper shank portion 6 of the holder body 1 is moved by the manipulator to the spindle 2. , and at the same time engage the stopper piece 33 into the notch groove 32. At this time, the clamp shaft 10 is waiting at the position shown by the dashed line in FIGS. 1 and 2 (non-clamping position), and the mounting ring 8 is rotatably fitted to the outer peripheral surface 9 of the holder body 1. has been done. In other words, the screw 18 is loosely screwed into the screw hole 16 to the extent that the engaging portion 17 at the tip lightly contacts the annular groove 14 on the holder body 1 side.

After attaching the holder body 1 to the spindle 2 as described above, attach the mounting ring 8 on the holder body 1.
Adjust the position of the engagement recess 15 of this attachment ring 8 to the position of the engagement shaft part 11 of the clamp shaft 10 by appropriately rotating it by hand. After the alignment of the engagement recess 15 with respect to the engagement shaft 11 is completed, each screw 18 is strongly loosened, and the engagement portion of the tip of each screw 18 with respect to the inclined inner wall surface 19 of the annular groove 14 is 17, the mounting ring 8 is drawn toward the flange 7, and the rear end surface of the mounting ring 8 is pressed against the end surface 22 of the flange 7, thereby integrally fixing the mounting ring 8 to the holder main body 1.

Thereafter, the air cylinder 13 is operated to lower the clamp shaft 10 and engage the engagement shaft portion 11 at the tip into the engagement recess 15 of the mounting flange 8. As a result, the tapered engagement shaft portion 11 is connected to the inclined inner wall surface 21 of the engagement recess 15.
, 21, and the holder main body 1 is clamped via this mounting flange 8. After the holder main body 1 is clamped in this manner, a required cutting process is performed using the non-rotating cutting tool 3 fixed to the chuck part 4. That is, while the machine tool side remains fixed and the workpiece side is moved in a required linear direction, the non-rotating cutting tool 3 performs, for example, grooving.

In the above-mentioned cutting process, since the holder body 1 is securely fixed at a fixed position by the above-mentioned clamping device, the non-rotating cutting tool 3 does not wobble.

[0028]

[Effects of the Invention] According to the holder clamp device of the present invention, the tool holder can be securely fixed in a fixed position.
Even if there is a gap between the stopper piece that connects the spindle and the holder body and the notch groove, and there is play on the holder body side, the non-rotating cutting tool will not rattle during cutting, and therefore the machining will be smooth. Accuracy can be improved.

Furthermore, according to the related invention, the attachment ring can be made rotatable relative to the holder body, so that even if the engagement recess of the attachment ring is at an arbitrary position when performing a clamp operation, By appropriately rotating this attachment ring, the engagement recess can be easily positioned relative to the engagement shaft of the clamp shaft in the fixed position.

[0030]The engagement shaft portion is formed into a tapered shape, and the inner wall surface of the engagement recess that faces in the circumferential direction of the mounting ring is formed into a tapered shape, so that the engagement shaft portion and the engagement recess are formed in a tapered shape. The wedge action becomes more effective. Similarly, the tip engaging portion of the screw tool is formed into a tapered shape, and the annular groove has an inclined inner wall surface that is farthest from the flange side at least among the opposing inner wall surfaces of the annular groove. The wedge action between the part and the annular groove becomes more effective.

Furthermore, by using a fluid pressure cylinder, particularly an air cylinder, as the clamp shaft driving means, the structure of the driving means becomes simple and compact.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a tool holder clamp device showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a partially cutaway exploded perspective view of the holder body with the attachment ring removed.

FIG. 4 is a perspective view showing a screw tool.

[Explanation of symbols]

1 Holder body 2 Spindle 3 Non-rotating cutting tool 7 Flange 8 for gripping the manipulator
Attachment ring 9 Front side outer peripheral surface of flange in holder body 10 Clamp shaft 11 Engagement shaft portion 13 Air cylinder (clamp shaft driving means) 14
Annular groove 15 Engagement recess 16 Screw hole 17 Engagement part 18 Screw tool 19 Slanted inner wall surface of the annular groove 20 Slanted inner wall surface of the annular groove 21 Slanted inner wall surface of the engagement recess

Claims (5)

[Claims] Claims: 1. A holder body that is attached to a spindle of a machine tool and has an engagement recess on its outer circumferential surface, and a clamp shaft drive means provided on a fixed part of the machine tool that allows the engagement shaft at the tip to be moved into the engagement recess. A tool holder clamp device comprising a clamp shaft that is wedge-engaged with and removably engaged with the tool holder. 2. A holder body that is attached to a spindle of a machine tool, a mounting ring that has an engaging recess on its outer circumferential surface and is rotatably fitted on the front side of a flange for gripping a manipulator on the holder body, and a machine tool. a clamp shaft, the engagement shaft at the tip of which is removably wedge-engaged with the engagement recess by a clamp shaft drive means provided on the fixed part;
The holder body has an annular groove on its outer circumferential surface where the mounting ring is fitted, and the mounting ring has a plurality of threaded holes at required intervals in the circumferential direction, and each threaded hole has a tip end. A tool holder clamp device in which a screw having an engaging portion is screwed into the tool holder, and the engaging portion is wedge-engaged with the annular groove. 3. The engagement shaft portion of the clamp shaft is formed in a tapered shape, and the engagement recess with which it engages has at least an inner wall surface facing in the circumferential direction of the holder body or the attachment ring formed in a tapered shape. The tool holder clamp device according to claim 1 or 2. 4. The distal end engaging portion of the screw tool is formed into a tapered shape, and the annular groove of the mounting ring with which the distal end engaging portion engages is located at least on the side farther from the flange side of the opposing inner wall surfaces of the groove. The tool holder clamp device according to claim 2 or 3, wherein the inner wall surface is formed in an inclined shape. 5. The tool holder clamp device according to claim 1, wherein said clamp shaft driving means comprises a fluid pressure cylinder, and said clamp shaft is connected to a piston rod thereof.