JPH066242B2 - Tool holder device - Google Patents

Description

The present invention relates to a tool holder device, and more specifically, a holder member having a cutting tool rotatably mounted thereon is detachably attached to an apparatus main body, and the holder member is suitable. The present invention relates to a tool holder device that is lighter in weight and that allows the holder member to be replaced more easily.

In recent years, when processing and molding products in a factory,
A highly automated line production system is adopted. This is because various products can be efficiently mass-produced.
In such line production, machine tools of different types are arranged, for example, in parallel, the work is conveyed to the machining work position of the machine tool by the conveying device, and predetermined machining is sequentially performed to finally obtain a desired shape. Is what you get.

By the way, generally, many kinds of works are often processed in a factory. However, in this case, it is not economical in practice to arrange various machine tools corresponding to the type of the work, and it does not meet the demand for effectively utilizing the small space in the factory. . Conventionally, in order to solve such drawbacks and perform various machining with a single machine tool, various types of tool holders are detachably attached to the device body. Tool holders are detachably attached to the device body. The holder device for a tool is widely adopted, and its technical idea is disclosed in, for example, Japanese Patent Publication No. 47-32112.

That is, in FIG. 1, reference numeral 2 indicates a tool holder device. The tool holder device 2 includes a device body 4 and a tool holder 6. A spindle 12 is rotatably supported in bearings 10a and 10b in a spindle head 8 constituting the apparatus body 4.

The spindle 12 is rotationally driven via a drive gear 14, and an adapter 16 is attached to the tip of the spindle 12.
Is stuck. In this case, the adapter 16 is formed with a conical hole portion 18 in the axial direction. A guide metal 20 is fixed in the spindle 12 in the vicinity of the adapter 16, and a large-diameter hole 22 and a smaller-diameter hole 24 are formed in the guide metal 20 through a step. Has been done. Further, a shaft member 26 is arranged in the spindle 12,
A holder 28 is fixed to the tip of the shaft member 26. In this case, a plurality of holes 30 are formed in the outer peripheral edge of the holder 28, and balls 32 are fitted in the holes 30. In addition, a cylinder mechanism (not shown) is connected to the other end of the shaft member 26, and the shaft member 26 is connected via the elastic force of the disc spring 34 externally fitted to the shaft member 26 and the cylinder mechanism. In the figure, it is possible to displace in the directions of arrows A and B.

On the other hand, a large-diameter grip portion 36 is formed on the outer peripheral portion of the tool holder 6, and a taper portion 38 that fits into the hole portion 18 of the adapter 16 is formed on one end side of the grip portion 36. further,
A columnar body 40 is screwed onto the tip of the tapered portion 38.
A cutting tool 42 is fixed to the tool holder 6.

In such a configuration, when a drive source (not shown) is driven to rotate the drive gear 14 in a predetermined direction, the spindle 12 on which the drive gear 14 is mounted rotates and is fixed to the tip of the spindle 12. The tool holder 6 is rotated via the adapter 16 that rotates. Therefore, the tool holder device 2
Is moved closer to a work (not shown), the predetermined work is performed on the work by the cutting tool 42 mounted on the tool holder 6.

Next, a procedure for replacing the tool holder 6 will be described below.

First, in a state in which the grip portion 36 of the tool holder 6 is gripped by a chuck portion (not shown) for exchanging tools, a cylinder mechanism (not shown) is driven to move the shaft member 26 against the resilient force of the disc spring 34 by an arrow. Displace in the A direction. When the shaft member 26 is displaced in the direction of the arrow A, the ball 32 is displaced via the holding body 28 fixed to this tip, and the ball 32 is guided by the guide metal.
The pressing action on the columnar body 40 is released by entering the large diameter hole 22 from the hole 24 of 20. Then, when the tool holder 6 is moved in the direction of arrow A, the columnar body 40 is displaced integrally with the tool holder 6 in the direction of arrow A, and as a result, the tool holder 6 is removed from the apparatus body 4.

Next, the tool holder 6 on which a new tool is mounted is gripped by a not-shown chuck portion, which is displaced in the direction of arrow B to loosely fit the columnar body 60 in the holding body 28, and the taper portion 38 is provided in the hole of the adapter 16. Fit in the part 18. Then, by driving a cylinder mechanism (not shown) to displace the shaft member 26 in the direction of the arrow B by the elastic force of the disc spring 34, the ball 32 is moved through the holding body 28 provided at the tip of the shaft member 26. The hole 22 enters the hole 24 from a small diameter. Therefore, the end portion of the ball 32 projects into the holding body 28 and presses the outer peripheral surface portion of the columnar body 40, so that the tool holder 6 is attached to the apparatus body 4.

By the way, in the above-mentioned conventional technique, in order to position and fix the tool holder 6 to the apparatus main body through the taper portion 38, the taper portion 38 is formed to have a relatively large diameter and be long in the axial direction. Moreover, a columnar body 40 extending in the axial direction is screwed to the end of the tapered portion 38. For this reason, the tool holder 6 becomes large and weighs considerably, and the replacement work of the tool holder 6 for dealing with different kinds of works becomes extremely complicated. Furthermore, when the tool holder 6 is automatically replaced by a tool changing device or the like, the tool holder 6
There is no other choice but to increase the size of the device itself for holding the device, which increases the area occupied by the device in the factory. Moreover, since the taper portion 38 and the columnar body 40 are formed to be considerably long in the axial direction, when the tool holder 6 is replaced, the tool holder 6 has to be moved by a considerable distance in the directions of arrows A and B. Therefore, the replacement of the tool holder 6 becomes troublesome, and the space required for the replacement work becomes extremely large. Further, it is pointed out that the tool holder 6 itself is considerably large in size, so that the apparatus main body 4 into which the tool holder 6 is loaded is also large in size.

The present invention has been made to overcome the above-mentioned inconvenience, and a holder member that rotatably supports a cutting tool is provided with a fitting portion that fits into the apparatus body and an engaging portion that engages with the coupling mechanism. The holder member is formed to be lightweight and small in size by providing the fitting portion, selecting the axial length of the fitting portion as short as possible, and detachably mounting the holder member to the apparatus main body through the connecting mechanism. At the same time, it is an object of the present invention to provide a tool holder device that can further facilitate the work of exchanging the holder member.

In order to achieve the above-mentioned object, the present invention provides a holder member that is rotatably supported at the time of rotation provided with a cutting tool, the holder member can be detachably mounted, and the rotating shaft can be connected to a main shaft. A device main body, and a connecting mechanism for connecting the holder member to the device main body, the device main body having a support end surface and a tapered hole portion inwardly reducing in diameter from the support end surface, The holder member has an abutment surface that is engaged with the support end surface and positioned, a taper fitting portion that fits in the taper hole portion, and a rotary shaft insertion hole that penetrates in the axial direction, A bearing member for rotatably supporting the rotary shaft at a position corresponding to a tip end portion of a holder member projecting outward from the device body is disposed in the rotary shaft insertion hole, and the connecting mechanism is provided for the main shaft. Displaceable in the axial direction A coupling member, a sphere that fits into a hole formed in the radial direction at one outer peripheral edge of the coupling member, and a hole that fits the coupling member and an inner peripheral surface that defines the hole. A guide member having a circumferential groove formed therein for accommodating the sphere; a protrusion provided on the holder member and fitted into the connecting member; and a protrusion continuously provided on the protrusion and having a diameter smaller than that of the protrusion. And a neck.

Next, a preferred embodiment of the tool holder device according to the present invention will be given and described in detail below with reference to the accompanying drawings.

2 to 4, reference numeral 50 indicates a tool holder device according to the present invention, and the holder device 50 basically includes a device main body 52 and a holder portion 54.

The spindle head 56, which is a guide member constituting the apparatus main body 52, has a substantially cylindrical shape, has a flange portion 58 formed at one end thereof, and a support end surface 59 is provided at the tip portion thereof (see FIG. 3). A taper portion 60 having a predetermined length is formed in the central portion of the spindle head 56 so as to be oriented in the axial direction. The taper portion 60 is directed inward of the spindle head 56 and is inclined inward in the radial direction.
The inner end of 60 is communicated with the circumferential groove 62, and the end of the circumferential groove 62 is communicated with the long hole 64. Further, one end portion of the hole portion 64 communicates with hole portions 66 and 68 having small diameters via a step portion. Then, a passage 70 communicating with the end of the hole 64 is formed in the outer peripheral portion of the spindle head 56, and the passage 70 is connected to a switching valve (not shown), while the outer peripheral portion of the spindle head 56 has a hole portion. A screw hole 72 communicating with 68 is formed, and the screw hole 72
A fixing screw 74 is screwed into this.

A connecting member is formed in the spindle head 56 configured as described above.
76 will fit. The connecting member 76 has a cylindrical shape,
A large-diameter hole 78 is formed in the center of the hole in the axial direction, and a small-diameter hole 80 is communicated with one end of the hole 78 via a step. Further, a cylindrical portion 82 that fits into the hole portion 66 of the spindle head 56 is formed at one end of the outer periphery of the connecting member 76, while a plurality of holes that communicate with the hole portion 78 is formed at the other end of the outer periphery of the connecting member 76. The holes 84a to 84f are bored to form the holes 84a.
The balls 85a to 85f are fitted to the balls 84 to 84f. And
The disc spring 86 is arranged in the hole 78 of the connecting member 76, and the holder 88
Fit into the hole 78 and the hole 80.

The outer cylinder portion 90 of the holding body 88 is fitted into the hole portion 80 of the connecting member 76 and the hole portion 68 of the spindle head 56, and the large diameter portion 92 formed at one end of the outer cylinder portion 90 is the connecting member 76. It fits in the hole 78. A peripheral groove 94 is formed at a predetermined position on the outer circumference of the outer cylindrical portion 90, and a tip portion of a fixing screw 74 screwed into the spindle head 56 is engaged with the peripheral groove 94. Therefore, the holder 88 is prevented from being displaced in the axial direction with respect to the spindle head 56. In addition, a hole 98 is formed in the center of the holder 88 in the axial direction. The hole 98 communicates with the hole 96 via a step. A needle bearing 100 is arranged in the hole 96 and a main shaft 102 is fitted therein.

The main shaft 102 is connected to a rotary drive source (not shown), and one end of the main shaft 102 has a hole portion 1 oriented in the axial direction.
04 is formed. In this case, the hole 104 has a shape corresponding to the spline of the rotary shaft described later.

On the other hand, a large diameter portion 110 is formed at one end of the cylindrical portion 108 of the holder 106 constituting the holder portion 54 via a step portion, and a circumferential groove 112 for holding the holder is engraved in the large diameter portion 110. It A contact surface 113 is provided at one end of the large-diameter portion 110 so as to be engaged with the support end surface 59 of the spindle head 56 and positioned, and the taper portion 11 extends inward from the contact surface 113.
4 are provided. In this case, the tapered portion 114 corresponds to the tapered portion 60 formed on the spindle head 56,
Therefore, the tapered portion 114 is directed outward and is inclined inward in the radial direction. Further, a neck portion 116 having a small diameter is formed at an end portion of the taper portion 114 via a step portion, and a protruding portion 118 is formed at the end portion of the neck portion 116 so as to bulge outward. The protrusion 118 includes an inclined surface 120 that is inclined radially outward from the end of the neck 116, and a cylindrical surface 122 that extends in the axial direction from one end of the inclined surface 120.
Fits into the hole 78 of the connecting member 76. Furthermore, a hole portion 124 is formed in the center portion of the holder 106 in the axial direction from the end portion side of the cylindrical portion 108, and a small diameter hole portion 126 is formed at the end portion of the hole portion 124 via a step portion. Communicate with each other. A large-diameter hole 128 communicates with the end of the hole 126 through a step, and the hole 128
The end of the is communicated with the hole 130. These holes 12
4, 126, 128 and 130 allow holder 106
A rotary shaft insertion hole penetrating in the axial direction of is formed.

Next, the holder 106 is rotatably supported by the rotation shaft 132.
The rotating shaft 132 is integrally formed of a tool holder portion 134 and a spindle portion 136, and a flange-shaped large diameter portion 138 is provided between the tool holder portion 134 and the spindle portion 136. A mounting portion 140 is formed on the outer peripheral end edge of the tool holder portion 134 inclining in the radial direction by a predetermined angle, while a thread groove 142 is formed on the outer peripheral one end edge of the spindle portion 136. An engaging portion 144 provided with a predetermined spline is formed at the end of the groove 142. Then, the rotary shaft 132 is loosely fitted in the holder 106, the needle bearing 146 and the thrust bearing 148 are arranged in the hole 124, and the bearing 150 is arranged in the hole 128. Further, the nut member 15 is inserted into the thread groove 142 of the rotary shaft 132.
The rotation shaft 132 is rotatably attached to the holder 106 by screwing 4 together. In this case, the tool holder portion 134 of the rotary shaft 132
A predetermined cutting tool 156 is fixedly attached to the mounting portion 140 provided on the.

The tool holder device according to the present invention is basically configured as described above. Next, its operation and effect will be described.

First, the device main body 52 is attached to, for example, the base 157. In this case, the flange portion 58 of the spindle head 56 is provided with a hole portion for inserting a bolt (not shown), and a bolt is inserted into the hole portion so that a tip portion of the hole is formed in a screw hole (not shown) provided on the base 157. Screw the spindle head 56 into the base
Fixed to 157.

Therefore, when a rotary drive source (not shown) is driven to rotate the main shaft 102 connected thereto, a hole at the tip of the main shaft 102 is generated.
The spindle part 136 rotates via the engaging part 144 fitted to the 104. For this reason, the tool holder part 134 formed integrally with the spindle part 136 is rotated, and the bite 156 is attached to the main shaft 10.
Revolving around the axis of 2.

In this way, the work (not shown) is displaced closer to the holder device 50 side while the rotating shaft 132 is rotated, or the base 157 is moved to displace the holder device 50 to the work side and the cutting tool 156. Thus, for example, boring is performed. Next, after performing a predetermined machining with the cutting tool 156, the work and the holder device 50 are relatively displaced and displaced, the work after the completion of the machining is removed, and a new work is fixed at a predetermined machining work position. The boring process is carried out with the tool 156.

By the way, when machining different kinds of works, the rotary shaft 132 provided with a tool corresponding to the different works may be attached to the holder 106 by the following procedure.

That is, the circumferential groove 11 in which the holder 106 is formed in the large diameter portion 110 thereof.
It is grasped by a chuck portion such as a tool changing device (not shown) via the valve 2 and, in this state, a passage 70
Supply pressure oil to. The pressure oil flows into the hole 64 in the spindle head 56 and presses the connecting member 76 in the arrow A direction. Therefore, the connecting member 76 is displaced in the direction of the arrow A against the elastic force of the disc spring 86, and the balls 85a to 85f fitted into the holes 84a to 84f are separated from the inclined surface 120 of the holder 106 and the neck portion is separated.
It is loosely fitted between 116 and the circumferential groove 62 of the spindle head 56. Next, when the holder 106 is moved in the direction of arrow A via a chuck unit (not shown), the inclined surface 120 of the protrusion 118 is formed.
Again contact the balls 85a to 85f to bring the respective balls 85a to 85f into contact with each other.
The a to 85f are pressed outward in the radial direction of the connecting member 76. Therefore, the balls 85a to 85f separate from the hole 78 of the connecting member 76 and are pressed against the inner surface side of the spindle head 56 that defines the circumferential groove 62, and as a result, the protrusion 118 separates from the hole 78. The holder 106 is removed from the apparatus main body 52 (see FIG. 4).

In this way, after removing the holder 106 from the apparatus main body 52, the nut member 154 is disengaged from the thread groove 142, and the rotation shaft
The 132 is taken out of the holder 106, and a new rotary shaft 132 to which a predetermined bite 156 is fixed is fitted into the holder 106. Then, the nut member 154 is screwed into the thread groove 142 and the new rotary shaft 132 is rotatably attached to the holder 106.

Next, the holder 106 is gripped by a chuck portion (not shown), which is displaced in the direction of arrow B so that the tapered portion 114 of the holder 106 is engaged with the tapered portion 60 of the spindle head 56. Therefore, when the switching valve (not shown) is driven when the end of the large-diameter portion 110 abuts on the tip surface of the flange 58, the pressure oil filled in the chamber defined by the cylindrical portion 82 and the hole 64 is filled. Through the passage 70 to the outside. Therefore, the connecting member 76 is displaced in the direction of arrow B through the elastic force of the disc spring 86, and the balls 85a to 85f fitted in the holes 84a to 84f are integrated with the connecting member 76 in the direction of arrow B. And enters the hole 64 through the circumferential groove 62. Therefore, the balls 85a to 85f partially project into the holes 78 of the connecting member 76 so that the protrusions 118
The inclined surface 120 of is pressed in the direction of arrow B. After all, the holder 106
Is accurately positioned with respect to the spindle head 56 via the taper portions 114 and 60, and is firmly fixed to the apparatus main body 52 via balls 85a to 85f provided on the connecting member 76. On the other hand, the rotary shaft 132 supported by the holder 106
Is engaged with the main shaft 102 by fitting the engagement portion 144 into the hole 104.

In this case, if the respective rotary shafts 132 to which the different types of cutting tools 156 are fixed are previously attached to the predetermined holders 106 and the respective holders 106 are arranged in the order in which they are used, the above-mentioned tool It can be easily appreciated that the replacement work of 1 is performed more efficiently.

Therefore, the main shaft 102 may be rotationally driven to rotate the rotary shaft 132 attached thereto, and the machining operation may be performed by the new cutting tool 156 according to the procedure described above.

According to the present invention, as described above, the replacement work of the holder 106 can be performed extremely easily. That is, in the holder 106, the portion to be inserted into the spindle head 56 that constitutes the apparatus main body 52 is configured to be as short as possible. In other words, the taper portion 114, the neck portion 116, and the protrusion 118 are the insertion portion. Therefore, a tool exchanging device (not shown) that holds the holder 106 can perform the attachment / detachment work of the holder 106 only by displacing the insertion portion of the holder 106 by the length H in the arrow A or B direction. In other words, the range of movement of the tool changer is considerably shorter than that of a conventional holder having a considerably long-axis taper portion and a column body that engages with the coupling mechanism is screwed to the taper portion. . Therefore, the space area occupied for the tool changing work can be made as narrow as possible. Moreover, the holder 106 can be manufactured in a light weight, and therefore, the device main body 52 and the above-mentioned tool changing device are not made too large, and the space in the workplace can be effectively utilized.

Next, another embodiment of the tool holder device according to the present invention is shown in FIG.

The same components as those in the first embodiment described above are designated by the same reference numerals with a, and the detailed description thereof is omitted.

In this case, in the second embodiment, a second main shaft 158, which is a guide member that rotates by engaging with a rotary drive source (not shown), is provided at the position of the spindle head 56 shown in the first embodiment. The spindle head 56 is attached to the second spindle 158.
Similarly, a tapered portion 160 corresponding to the tapered portion 114a of the holder 106a is formed, and a circumferential groove 162 is formed at the end of the tapered portion 160.
Communicate with each other. Further, a long-axis hole 164 communicates with the end of the circumferential groove 162, and small-diameter holes 166 and 168 communicate with the end of the hole 164 via a step. The second main shaft 158 is rotatably supported by the spindle head 56a via bearings 170a to 170c. On the other hand, the second bite 172 is fixed to the tip edge portion of the cylindrical portion 108a forming the holder 106a.

In such a configuration, when the first rotary drive source (not shown) connected to the first main shaft 102a is driven, the first main shaft 102a is driven.
The rotating shaft 132a, which is engaged with the 102a via the engaging portion 144a, rotates, and the first bite 156a fixed to the tip of the rotating shaft 132a rotates. Furthermore, a second main spindle 158 that drives and engages a second rotary drive source (not shown)
When the tool is rotated, the holder 106a mounted on the second type main shaft 158 is rotated, and as a result, the second bite 172 becomes the first bite 1
It rotates independently of 56a.

Therefore, if the work (not shown) and the holder device 50a are relatively displaced, the cutting tools 156a and 172 are attached to the work.
Two different types of machining are performed depending on the type. In this case, rotate either one of the cutting tools 156a, 172 to place the first work on the work.
It is also possible to perform the second processing on the work by rotating the other of the cutting tools 156a and 172 after performing the processing.

It should be noted that the holder 106a is removed from the apparatus main body 52a, and a new holder 106a on which a desired bit is mounted is attached to the apparatus main body 52a.
It will be easily understood that the same procedure as in the above-described first embodiment can be performed for the attachment to the.

As described above, according to the present invention, the holder member for rotatably supporting the cutting tool is removably attached to the apparatus main body, and the portion where the holder member and the apparatus main body are engaged is movable in the axial direction. It is configured to be as short as possible. Therefore, the space occupied by the tool holder replacement work is narrowed, and the tool holder itself can be made light and small, and the tool holder replacement work is further simplified. In addition, the entire tool holder device, the tool changing device, and the like are preferably downsized, and the area occupied by the device in the factory can be efficiently reduced.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. Of course.

[Brief description of drawings]

FIG. 1 is a partially omitted vertical sectional view of a tool holder device according to a conventional technique, FIG. 2 is a partially omitted exploded perspective view of a tool holder device according to the present invention, and FIG. 3 is a part of the holder device. Omitted vertical sectional view, FIG. 4 is a partially omitted vertical sectional view showing holder replacement work in the holder device, and FIG. 5 is a partially omitted vertical sectional view showing another embodiment of the tool holder device according to the present invention. Is. 50, 50a ... Holder device 52, 52a ... Device body 54, 54a ... Holder part 56, 56a ... Spindle head 60, 60a ... Tapered part 62, 62a ... Circumferential groove 86, 86a ... Disc spring 88, 88a ... Holding body 102, 102a ... Spindle 106, 106a ... Holder 114, 114a ... Tapered portion 116, 116a ... Neck 118, 118a ... Projection 132, 132a ... Rotating shaft 158 ... Spindle

Claims (2)

[Claims] 1. A holder member for rotatably supporting a rotary shaft provided with a cutting tool, an apparatus main body to which the holder member is detachably mounted and which is connectable to the main shaft, and the holder. A connecting mechanism for connecting a member to the apparatus main body, wherein the apparatus main body has a supporting end surface and a tapered hole portion whose diameter decreases inwardly from the supporting end surface, and the holder member supports the supporting member. An abutting surface that is engaged with the end surface and positioned, a taper fitting portion that fits into the taper hole portion, and a rotary shaft insertion hole that penetrates in the axial direction, and the rotary shaft insertion hole includes: A bearing member for rotatably supporting the rotary shaft is disposed at a position corresponding to a tip end portion of a holder member protruding from the apparatus body, and the coupling mechanism is a coupling displaceable in an axial direction of the main shaft. Member and the connecting member A spherical body that fits into a hole formed in the radial direction at one outer peripheral edge of the, and a circumference that accommodates the spherical body in an inner peripheral surface that defines the hole while providing a hole into which the connecting member is fitted. A guide member having a groove, a protrusion that is provided on the holder member and that fits into the connecting member, and a neck that is provided continuously to the protrusion and has a diameter smaller than that of the protrusion. Characteristic tool holder device. 2. The device according to claim 1, wherein a rotary shaft provided with a first cutting tool is rotatably supported in a rotary shaft insertion hole of the holder member via a bearing member. In addition, a second cutting tool is integrally fixed to the outer surface portion of the holder member, and the device body is connected to the holder member and a first main shaft connected to the rotary shaft. Second which is the guide member
A holder device for a tool, comprising: