JPH1080834A - Cutting tool attaching unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool attaching unit which can easily perform a fine adjustment of the cutting tool attachment position about the axis of the shank. SOLUTION: In a assembly in which a shank 2 is supported in a unit case 1, a connection part 4 is formed at an end of the shank 2, a chuck part 5 is formed at the other end of the latter, and a unit case fixing pin 22 is attached to a pin holding base 14 which is provided projected on the unit case 1, the unit case 1 is divided in a case part 1a on the pin holding base 14 side and a case part 1b on the chuck part 5 side, the case part 1a is to be rotatably fit into and fixed to the case part 1b, and there is provided a relative rotational displacement drive means 20 which relatively rotates and displaces both case parts 1a and 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool mounting unit for mounting a cutting tool on a main shaft of a machine tool via a shank.

[0002]

2. Description of the Related Art A cutting tool mounting unit of this type rotatably supports a shank that penetrates a case in a unit case, and can be coaxially connected to one end of the shank to a main shaft of a machine tool. And the other end is formed with a chuck portion on which the cutting tool is attached at an inclination of, for example, 90 degrees or 45 degrees with respect to the shank, and on a pin holding stand protruding from the unit case, A unit case fixing pin that can be locked to the frame end surface around the main shaft so as to be movable forward and backward,
Japanese Utility Model Publication No. 58-56112 and Japanese Utility Model Publication No. 2-39708
No., published in Japanese Unexamined Patent Publication No.

[0003]

In the cutting tool mounting unit described in the former publication, a unit having a chuck portion having an angle corresponding to the cutting angle of a work is used, and the cutting tool mounting unit described in the latter publication is used. In the fixture mounting unit, the cutting at a required cutting angle can be performed by appropriately replacing only the front end side case portion of the unit case. That is, any cutting tool mounting unit can set the mounting angle of the cutting tool to a predetermined rough angle, but finely adjust the mounting angle of this cutting tool in micron units around the axis of the shank. What was impossible or not easy to do.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cutting tool mounting unit capable of easily performing fine adjustment of a cutting tool mounting angle about an axis of a shank.

[0005]

According to a first aspect of the present invention, there is provided a cutting tool mounting unit in which a shank 2 penetrating through a case 1 is rotatably supported in a unit case 1 and one end of the shank 2 is attached to the shank 2. A connecting portion 4 with the machine tool main shaft 3 is formed, and a chuck portion 5 to which a cutting tool 10 is attached is formed at the other end. In a cutting tool mounting unit in which a unit case fixing pin 22 lockable to an end face of the frame 21 around the main shaft 3 is attached to the holding table 14 so as to be able to advance and retreat, the unit case 1 is provided with the pin holding table 14 protruding. And a case portion 1b connected to the chuck portion 5 side, and one of the case portions 1a is connected to the other case portion 1b by the axis G of the shank 2. A relative rotation displacement driving means 20 is provided between the two case parts 1a and 1b to relatively rotate and displace the two case parts 1a and 1b relative to each other. It is characterized by becoming.

In the cutting tool mounting unit according to a second aspect, a split groove 18 is formed in the one case portion 1a, and the space between the split grooves 18 is tightened with a bolt 19, so that the inside of the one case portion 1a is formed. The diameter of the peripheral surface is reduced and the peripheral surface is fixed to be pressed against the other case portion 1b.

A third aspect of the present invention is the cutting tool mounting unit according to the first or second aspect, wherein the relative rotational displacement driving means 20 is provided.
Forms an annular groove 27 on the outer peripheral surface of the other case portion 1b in contact with the inner peripheral surface of the one case portion 1a;
A plurality of partition pieces 28 are arranged in the annular groove 27 at regular intervals in the circumferential direction, and the partition pieces 2 adjacent to the annular groove 27
A required number of rolling elements 29 are loaded between the first and second case parts 1 and 8 and the annular concave groove 27 is formed in the one case part 1a from the outer periphery thereof.
A screw hole 30 is formed substantially at a symmetrical position on both sides of the case portion 1a along a substantially tangential direction of the annular groove 27.
By arranging a sphere 31 which can be engaged with the rolling element 29 in the inside and screwing a screw 32 for pressing the sphere 31 against the rolling element 29, and tightening one of the two screws 32, One partition piece 28 is loaded through a spherical body 31, a rolling element 29 engaged with the spherical body 31, and a series of rolling elements 29 connected thereto, and the other case portion 1b is rotationally displaced with respect to the one case portion 1a. It is characterized in that it is made to be.

According to a fourth aspect of the present invention, in the cutting tool mounting unit according to the third aspect, the rolling element 29 is formed of a roller.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting tool mounting unit according to the present invention has a shank 2 penetrating the case 1 inside a unit case 1 as shown in a longitudinal sectional view of FIG.
The shank 2 is rotatably supported, and at one protruding end of the shank 2 (left side in the drawing), a frustoconical connection 4 with the main shaft 3 of the machine tool is formed. A part 5 is formed. In this chuck portion 5, a shank 7 of a chuck 6 is arranged orthogonal to the shank 2.
The unit case 1 is rotatably provided by a bearing 13. The two shanks 2 and 7 are interlocked and connected via bevel gears 8 and 9, and when the shank 2 rotates, the bevel gears 8 and 9 and the shank 7 are connected. The chuck part 5 rotates, and the cutting tool 10 attached to the chuck 6 rotates in a state of being inclined at right angles to the shank 2.

The unit case 1 includes a pin holder 14
Are divided into a short cylindrical case portion 1a integrally projecting therefrom and a case portion 1b connected to the chuck portion 5 side. The case portion 1b on the chuck portion 5 side includes a cylindrical first member 15 and a substantially bottomed cylindrical second member 16 coaxially and integrally connected to the first member 15 with a plurality of bolts 17. The case portion 1a on the pin holding base 14 side is externally fitted to the first member 15 of 1b so as to be rotatable around the axis G of the shank 2. FIG. 2 shows the case part 1a.
As can be seen from the drawing, a split groove 18 is formed in the axial direction at a position diametrically opposed to the position where the pin holder 14 is provided, and two fastening bolts 19 are interposed between the split grooves 18. Then, by tightening the bolt 19, the inner peripheral surface of the case portion 1a is reduced in diameter and fixed to the outer peripheral surface of the other case portion 1b by pressure. And both case parts 1a,
Relative rotational displacement driving means 20 for relative rotational displacement of the two case parts 1a, 1b relative to each other is provided between the case parts 1b.

A hollow unit case fixing pin 22 which can reciprocate toward the end surface of the frame 21 around the main shaft 3 of the machine tool is fitted into the pin holder 14 projecting from the case portion 1a. 22 is urged by a spring 23 in the protruding direction. The tip of the pin 22 is formed in a tapered shape. The tapered tip fits into a locking hole 24 formed in the end face of the frame 21, so that the unit case 1 is moved to the frame 21 through the pin 22. It is fixed.

A stopper 25 for preventing rotation of the shank is slidably fitted to the unit case fixing pin 22, and a protruding piece 25a of the stopper 25 is engaged with a locking portion 26 provided on the shank 2 side. By the combination, the shank 2 is fixed to the unit case 1, for example,
It is possible to prevent the shank 2 from undesirably rotating at the time of automatic replacement of the unit in the machining center.

The relative rotational displacement driving means 20 will be described below. As shown in FIGS. 1 and 2, the relative rotational displacement driving means 20 is formed by a first part of the chuck part 5 side case part 1b which is in contact with the inner peripheral surface of the pin holder 14 side case part 1a. An annular groove 27 is formed on the outer peripheral surface of one member 15, and a plurality of partitioning pieces 28 are formed in the annular groove 27.
Are arranged at regular intervals in the circumferential direction, and a plurality of rollers 29 are provided between adjacent partitioning pieces 28, 28 of the annular groove 27.
(The rolling element) is loaded in such a manner that a slight gap is formed between the rolling element and one of the partitioning pieces 28, and the pin holding base 14 side case portion 1 a is opened from the outer peripheral portion to the annular concave groove 27. Screw holes 30 are formed at positions symmetrical on both sides of the case portion 1a along substantially the tangential direction of the annular groove 27. Each of the screw holes 30 has the annular groove 2 in the inner part thereof.
A screw 31 for disposing a sphere 31 engageable with the roller 29 and pressing the sphere 31 against the roller 29
2 is screwed. Each partition piece 28 is fixed to the first member 15. If the roller 29 is used as the rolling element, the engagement of the sphere 31 is easy and the operation is reliable. Instead of the roller 29, a sphere may be used. The tip of each partition piece 28 is formed in a semi-cylindrical shape.

When operating the relative rotational displacement driving means 20, the cutting tool mounting unit is mounted on the main shaft 3 of the machine tool, and the pin holding base 14 side case portion 1a is fixed to the end face of the frame 21 via the unit case fixing pin 22. In this state, first, the tightening bolt 19 of the case portion 1a on the pin holder 14 side is loosened so that the case portion 1a and the case portion 1b on the chuck portion 5 can be relatively rotated. However, when the chuck portion 5 side case portion 1b is to be slightly displaced relative to the pin holding base 14 side case portion 1a, for example, in the counterclockwise direction of FIG. When the screw 32 is loosened and the screw 32 in the screw hole 30 on the left side of the drawing is tightened, the sphere 31 is loaded into the annular groove 27.
The roller 29 is pressed against and engaged with the two rollers 29, and accordingly, the sphere 31, the roller 29 engaged with the sphere 31, and a series of rollers 29 continuous with the roller 29 (the hatched roller on the left side of FIG. 2) 29), one partition piece 28 on the tip side thereof is loaded, and the chuck 5
The side case portion 1b is replaced with the pin holding base 14 side case portion 1a.
2 corresponding to the tightening amount of the screw 32 in FIG.
In the counterclockwise direction, the mounting position of the cutting tool 10 mounted on the chuck portion 5 can be finely adjusted around the axis G of the shank 2.

When the case portion 1b on the chuck portion 5 side is to be slightly displaced relative to the case portion 1a on the pin holding base 14 in the opposite direction, that is, in the clockwise direction in FIG. When the screw 32 in the screw hole 30 on the left side of the figure is loosened and the screw 32 in the screw hole 30 on the right side of the figure is tightened, the sphere 31 is loaded into the annular groove 27 in the same manner as described above. The roller 29 is pressed against and engaged with the two rollers 29, and is engaged with the sphere 31 through a series of rollers 29 (a group of rollers 29 with hatching on the right side in FIG. 2) which are in close contact with each other. One partition piece 28 on the distal end side is loaded, and the chuck portion 5 side case portion 1b is rotated clockwise in FIG. 2 by an amount corresponding to the tightening amount of the screw 32 with respect to the pin holding base 14 side case portion 1a. Rotational displacement in the direction It would cause.

After the fine adjustment as described above, the loosened screw 32 is tightened and fixed, and the tightening bolt 19 of the case portion 1a on the pin holding base 14 is tightened to hold the pin. Table 14 side case part 1a and chuck part 5
What is necessary is just to fix integrally with the side case part 1b.

The case where the mounting angle of the cutting tool 10 mounted on the chuck portion 5 is finely adjusted in units of microns around the axis G of the shank 2 has been described above.
When the mounting position of 0 is largely changed around the axis G of the shank 2, the tightening bolt 19 of the case portion 1a on the pin holder 14 side is loosened so that the two case portions 1a and 1b can be relatively rotated. Then, the chuck portion 5 side case portion 1b is manually or mechanically operated to hold the pin holding table 1b.
The shank 2 may be rotated around the axis G of the shank 2 by, for example, about 45 degrees or 90 degrees with respect to the four-side case portion 1a.
Then, after such a large angle change, the fine adjustment as described above may be performed by the relative rotational displacement driving means 20.

FIGS. 3 and 4 show the case 1a and 1b of the unit case 1 from the state shown in FIG.
This shows a state in which the chuck portion 5 side case portion 1b is rotated by about 20 to 45 degrees with respect to the pin holding base 14 side case portion 1a. As can be seen from these figures, the position of each partition piece 28 fixed to the chuck portion 5 side case portion 1b moves according to the rotation of the case portion 1b. May be engaged with any of the plurality of rollers 29 arranged between the partitioning pieces 28 adjacent to each other in the circumferential direction of the annular groove 27. Therefore, regardless of the position of the partitioning piece 28, In other words, the fine adjustment can be performed irrespective of the relative position of the case portions 1a and 1b in the circumferential direction. The details of the fine adjustment in the case of FIGS. 3 and 4 are the same as in the case described above with reference to FIG. In addition, as shown in FIG.
In this case, the tightening force of the screw 32 is directly applied to the partition piece 28. In addition, two partition pieces 28 are arranged in the circumferential direction of the annular groove 27 by 18 pieces.
Although they may be provided at an interval of 0 degrees, it is preferable to provide three to four at a constant interval from each other.

FIGS. 5A to 5C show the case in which three partition pieces 28 are provided in the annular groove 27, and the case portion 1b on the chuck portion 5 side is moved with respect to the case portion 1a on the pin holding base 14 side. (A) to (C) sequentially around the axis G, for example, about 20
It shows a state in which it has been significantly rotated by about 25 degrees. 4 (D) to (F), the chuck unit 5 side case portion 1b is moved relative to the pin holding base 14 side case portion 1a by the relative rotational displacement driving means 20 from (D) to (F).
This shows a state in which the rotational displacement is made minutely around the axis G in order. That is, (E) of FIG.
The side case portion 1b is in a state of being rotationally displaced by θ1 (= 1 degree) from the position (D) with respect to the pin holding base 14 side case portion 1a, and FIG. Indicates a state in which θ2 (= 2 degrees) is rotationally displaced from the position (D).

In the embodiment described above, the pin holder 1
The four-side case portion 1a is externally fitted to the chuck portion 5-side case portion 1b (specifically, the first member 1 of the case portion 1b).
5), and the pin holder 14 side case portion 1a
Is formed so that the inner peripheral surface of the pin portion 14a side case portion 1a is pressed and fixed to the outer peripheral surface of the chuck portion 5 side case portion 1b by a tightening bolt 19. In the reverse relationship, the case part 1 on the chuck part 5 side
b is externally fitted to the pin holder 14 side case portion 1a,
A split groove 18 is formed in the chuck portion 5 side case portion 1b, and the inner peripheral surface of the chuck portion 5 side case portion 1b is pressed against the outer peripheral surface of the pin holding base 14 side case portion 1a by a similar tightening bolt. It may be fixed.

In this embodiment, one cutting tool 1
Although a cutting tool mounting unit provided with a so-called single-axis type chuck portion 5 to which the cutting tool 0 is mounted is illustrated, the cutting tool mounting unit of the present invention is a so-called multi-axis type chuck portion 35 as illustrated in FIG. It is also applicable to those having According to FIG. 6, the chuck 35 has two chucks 3
6 and 36, the shank 37 of each chuck 36 is arranged in parallel with the shank 2 penetrating the unit case 1, and both shank 36 are connected to the shank 2 via gears 38, 38 and 39, and each chuck 36 36 cutting tools 40
Is attached. Other configurations are the same as those of the aforementioned cutting tool mounting unit.

Further, in this embodiment, as the relative rotational displacement driving means 20, an annular groove 27 is formed in the case portion 1b on the chuck portion 5 side, and a plurality of partitioning pieces 28 are disposed in the annular groove 27. Then, a required number of rollers 29 are loaded between adjacent partitioning pieces 28, 28, and a screw hole 30 is opened from the outer peripheral portion of the pin portion 14a side case portion 1a into the annular groove 27.
And a sphere 31 engageable with the roller 29 is arranged in each screw hole 30, and a screw 32 for pressing the sphere 31 against the roller 29 is screwed. As the relative rotational displacement driving means, a gear mechanism may be employed.
A large gear is formed on the outer periphery of b, a small gear meshing with the gear is pivotally supported at a required portion of the case portion 1a on the pin holding base 14 side, and a handle for rotating the small gear from outside the unit case 1 is provided. By turning this handle, the large gear may be rotated via the small gear to rotate the chuck portion 5 side case portion 1b with respect to the pin holding base 14 side case portion 1a.

However, the gear mechanism as described above has difficulty in manufacturing, and therefore, the relative rotational displacement driving means 20 as shown in this embodiment is preferable. That is, according to the relative rotational displacement driving means 20, the annular groove 27 is provided on the outer periphery of the chuck portion 5 side case portion 1b, and a plurality of partition pieces 28 are provided in the annular groove 27, and the adjacent partition pieces 28 are provided. , 28
The required number of rollers 29 are loaded in between,
A screw hole 30 is provided in the side case portion 1a.
Since the screw 32 and the sphere 31 only need to be screwed into the device, the manufacture is simple and the assembly is easy.

[0024]

According to the cutting tool mounting unit according to the first aspect of the present invention, when the tightening bolt of the case portion having the split groove is loosened out of the two divided case portions,
The two case parts are relatively rotatable. Therefore, by rotating one case part relative to the other case part by a required angle around the axis of the shank, the mounting position of the cutting tool (the position of the chuck part) is shanked. Can be greatly changed around the axis. By once setting the mounting position of the cutting tool and then operating the relative rotational displacement driving means, fine adjustment of the mounting position of the cutting tool around the shank axis can be easily performed.

According to the cutting tool mounting unit of the second aspect, a split groove is formed in the one case portion, and the two case portions are firmly fixed to each other simply by tightening a gap between the split grooves. Therefore, the configuration is simple and the operation is easy.

According to the cutting tool mounting unit of the third aspect, in a state where the two case portions are in a state where they can be relatively rotated,
When one case portion is to be slightly displaced relative to the other case portion in a clockwise direction, for example, by a small amount, a screw screwed into a screw hole on the side corresponding to the rotation direction is tightened (at this time, By loosening the screw in the screw hole on the opposite side, the sphere is pressed and engaged with one rolling element loaded in the annular groove, and the sphere is thereby engaged with the sphere. Through a series of rolling elements connected to each other and connected to each other,
One partition is loaded, and one case is rotated clockwise in relation to the other case by an amount corresponding to the tightening amount of the screw, so that the cutting tool attached to the chuck is attached. The position can be fine-tuned around the axis of the shank.

When one case portion is rotationally displaced relative to the other case portion in the opposite direction, that is, in the counterclockwise direction, it is screwed into a screw hole corresponding to the counterclockwise direction. By tightening the existing screw (at this time, the screw in the screw hole on the opposite side is loosened), fine adjustment can be performed by the same operation as in the above case.

Further, according to the relative rotational displacement driving means according to the third aspect, an annular groove is provided on the outer periphery of one of the case portions, and a plurality of partitions are provided in the annular groove.
The required number of rolling elements are loaded between adjacent partition pieces, screw holes are provided in the other case part at symmetrical positions on both sides, and a screw is screwed into each screw hole and a sphere is inserted. It is easy to manufacture and easy to assemble.

Further, according to the relative rotational displacement driving means according to the third aspect, there is an advantage that fine adjustment can be performed regardless of the relative position of the two case portions in the circumferential direction.

According to the relative rotational displacement driving means according to the fourth aspect, since the rolling element is a roller, it can be easily engaged with a sphere and the operation is reliable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cutting tool mounting unit according to the present invention.

FIG. 2 is a cross-sectional view of the cutting tool mounting unit shown in FIG.

FIG. 3 is a similar cross-sectional view showing a state where a chuck portion side case portion is rotated by a required angle from the position of FIG. 2;

FIG. 4 is a similar cross-sectional view showing a state where the chuck portion side case portion is further rotated by a required angle from the position of FIG. 2;

FIGS. 5A to 5F are cross-sectional views of a cutting tool mounting unit showing various rotational displacement states of a case portion when three partition pieces are provided.

FIG. 6 is a partial cross-sectional side view of a cutting tool mounting unit including a multi-axis type chuck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit case 1a Pin holder case part 1b Chuck part side case part 2 Shank 3 Main shaft of machine tool 4 Connection part 5 Chuck part 10 Cutting tool 14 Pin holder 15 First member of chuck part side case part 16 Chuck part side case Partial second member 18 Split groove 19 Tightening bolt 20 Relative rotational displacement driving means 21 Frame 27 Annular groove 28 Partition piece 29 Roller (rolling element) 30 Screw hole 31 Spherical body 32 Screw tool

Claims (4)

[Claims] 1. A shank that penetrates a unit case is rotatably supported in a unit case. One end of the shank has a connection portion with a machine tool main shaft, and the other end has a cutting portion. Forming a chuck portion to which a tool is attached, projecting a pin holding base on the unit case, and attaching a unit case fixing pin capable of being locked to an end surface of the frame around the main shaft so as to advance and retreat to the pin holding base. In the cutting tool mounting unit, the unit case is divided into a case portion protruding the pin holding table and a case portion connected to the chuck portion side, and one of the case portions is the other case portion. The shaft portion is rotatably fitted around the axis of the shank, and a relative rotational displacement between the two case portions for relatively rotating the two case portions relative to each other. A cutting tool mounting unit characterized by being provided with driving means. 2. A split groove is formed in the one case portion, and the inner circumferential surface of the one case portion is reduced in diameter by being tightened with a bolt between the split grooves, and is pressed against the other case portion. 2. The fixing device according to claim 1, wherein
The cutting tool mounting unit as described. 3. The relative rotational displacement driving means forms an annular groove on an outer peripheral surface of the other case portion in contact with an inner peripheral surface of the one case portion, and a plurality of partitioning pieces are formed in the annular concave groove. Arranged at regular intervals in the circumferential direction, a required number of rolling elements are loaded between adjacent partitions of the annular groove, and the one case portion is opened from the outer peripheral portion to the annular groove. Screw holes are formed substantially tangentially to the annular groove at symmetrical positions on both sides of the case portion, and each screw hole is engageable with a rolling element in the annular groove at an inner portion thereof. A sphere, a rolling element engaging with the sphere, and a series of rolling elements connected to the sphere are screwed by inserting a screw that presses the sphere against the rolling element and tightening one of the two screws. One partition piece is loaded via a rolling element, and the other case portion is 3. The apparatus according to claim 1, wherein said one case portion is rotationally displaced.
2. The cutting tool mounting unit according to 1. 4. The cutting tool mounting unit according to claim 3, wherein the rolling element comprises a roller.