JPH0448562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a tool holder used for attaching tools such as drills, end mills, boring tools, etc. to machine tools.

Prior Art A tool holder is generally equipped with a tool insertion hole extending in the axial direction from its distal end surface.
It is desirable that the tool is always inserted at the same depth even after repeated removal, and that the position of the cutting edge is constant and that the position of the cutting edge is adjustable. Therefore, conventionally, a bolt was screwed onto the rear end surface of the tool.
The insertion depth can be determined by making it come into contact with the stopper surface provided deep inside the tool insertion hole, or by screwing a bolt into the tool insertion hole and making the rear end of the tool come into contact with this bolt. It was done to stipulate the

However, when defining the insertion depth of the tool in this way, regardless of whether the bolt is provided in the tool or the tool insertion hole,
It was necessary to remove the tool from the holder and change the screwing amount of the bolt, which was troublesome.

OBJECTS OF THE INVENTION The present invention was made against the background of the above circumstances, and an object of the present invention is to provide a tool holder in which the insertion depth of the tool can be adjusted without removing the tool from the holder.

Structure of the Invention In order to achieve this object, a tool holder according to the present invention includes (a) a tool holding part and a mounting part, a tool insertion hole is formed in the axial direction from the distal end surface of the tool holding part, and (b) A holder body that is fixed to the machine tool at the mounting part, and (b) a holder that is slidably fitted in the axial direction inside the tool insertion hole and comes into contact with the tool when the tool is inserted into the tool insertion hole. a stopper member that defines the insertion depth; (c) a female threaded hole formed in a portion of the holder body surrounding the stopper member and penetrating that portion in a substantially radial direction; and (d) a female threaded hole in the female threaded hole. (e) An adjustment bolt that is screwed together and has a conical surface with a conical surface whose diameter becomes smaller toward the tip end; (f) a stopper member; (f) an inclined surface that is formed to be inclined at the same angle as the inclination angle of the conical surface of the adjustment bolt so as to be farther from the female threaded hole as you go from the opening side to the innermost side; and (f) a stopper member. from the tip opening side of the tool insertion hole toward the inner back side,
and biasing means for keeping the inclined surface in contact with the conical surface.

Effects of the Invention In the tool holder configured as described above, when the adjusting bolt is screwed into the tool insertion hole side, the inclined surface of the stopper member is pushed by the conical surface of the adjusting bolt, and a gap is formed between the two surfaces. The wedge action causes the stopper member to move toward the opening side of the tool insertion hole, and conversely, when the adjustment bolt is loosened, the adjustment bolt is withdrawn from the tool insertion hole and the stopper member is moved toward the opening side of the tool insertion hole. The member is drawn into the innermost part of the tool insertion hole by the biasing means. That is, in the tool holder of the present invention, the position of the stopper member in the tool insertion hole can be changed by rotating the adjuster bolt, and the operator can adjust the amount of protrusion of the tool from the tool insertion hole. By appropriately rotating the adjusting bolt while looking at the tool, the insertion depth of the tool can be adjusted to the desired depth.

In this way, in the tool holder of the present invention,
The insertion depth of the tool can be adjusted by rotating the adjuster bolt, and this rotation operation involves engaging the tool with the rear end of the adjuster bolt and moving it outward in the radial direction of the holder body. In addition, since there is no need to remove the tool from the holder, the insertion depth of the tool can be adjusted extremely easily and quickly. Furthermore, compared to the conventional method of adjusting the tool insertion depth by screwing a bolt into the rear end of the tool, there is no need to screw the bolt into the tool, making the tool less expensive. The effect that can be produced can be obtained.

Embodiment Hereinafter, an embodiment in which the present invention is applied to a tool holder for a machining center will be described in detail based on the drawings.

In FIGS. 1 and 2, 10 is a holder body, and this holder body 10 includes a large diameter flange portion 12, a mounting portion 14 and a tool holding portion 16 extending from both end surfaces of the flange portion 12. It consists of The mounting portion 14 is formed in a tapered shape with a diameter decreasing toward the rear end of the holder, and is adapted to be fixed to a tool mounting portion of a machine tool (not shown). A tool insertion hole 18 is formed in the holder body 10 and extends in the axial direction from the tip of the tool holding portion 16. The tool insertion hole 18 has a large diameter at the part that passes through the tool holding part 16 and the flange part 1.
The portion located inside 2 is a stepped hole having a small diameter, and the small diameter hole portion 20 is formed eccentrically with respect to the large diameter hole portion 22 whose center line is the axis of the holder body 10. In addition, the mounting portion 14 includes a small diameter hole portion 20.
A through hole 24 is formed which communicates with the large diameter hole portion 22 and is concentric with the large diameter hole portion 22 . A female thread 25 is formed at the end of the through hole 24 opposite to the small diameter hole 20 side.
A pull stud (not shown) is screwed into this.

Two female threaded holes 26 are formed in the side wall surrounding the large diameter hole 22 of the holder body 10 by penetrating the side wall in the radial direction, and setscrews 28 are respectively screwed into these female threaded holes 26. ing. Further, a key groove 30 extending parallel to the center line of the large-diameter hole portion 22 is formed in a portion of the side wall that is diametrically apart from the portion where the female threaded hole 26 is formed.

FIG. 3 shows a tool 32 held by the tool holder of this embodiment. This tool 32 is a boring tool equipped with a cutting tool holder 36 at the tip of a shank 34, and on the outer circumferential surface of the shank 34, there is a shank 34 with a shank 34 that has a shank 34 with a cutting tool holder 36. A sloped surface 38 is formed, and a half-moon key 40 is attached to a portion diametrically apart from the portion where the sloped surface 38 is formed.

When attaching such a tool 32 to a tool holder, the shank 34 is inserted into the tool insertion hole 18 while aligning the phases of the tool 32 and the tool holder so that the half-moon key 40 can fit into the keyway 30. . Then, when the tool 32 is inserted to a predetermined position and the setscrew 28 is screwed in, the tip of the tool 32 is brought into contact with the inclined surface 38.
The tool 32 is fixed in an axially immovable and non-rotatable manner, and the rotational force of the machine tool applied to the holder body 10 is applied to the key 40 and the keyway 3.
0 to the tool 32.

A female threaded hole 42 is formed in a portion of the holder body 10 surrounding the small diameter hole portion 20, passing through this portion in a substantially radial direction. The female threaded hole 42 is formed in a portion of the side wall surrounding the small diameter hole 20 on the holder tip side, and an adjustment bolt 44 is screwed into this female threaded hole 42. A conical surface 46 is formed at the tip of the adjusting bolt 44, the diameter of which decreases toward the tip.

Further, a slider 50 is fitted in the small diameter hole 20 so as to be slidable in the axial direction.
0 functions as a stopper member that comes into contact with the rear end surface of the tool 32 inserted into the tool insertion hole 18 as described above and defines its insertion depth.
On the side surface of the slider 50 facing the adjuster bolt 44, a bottom surface 54 is sloped away from the female threaded hole 42 in the axial direction of the holder body 10 from the tip opening side of the tool insertion hole 18 toward the innermost side. A bottomed hole 52 is bored, and the tip of the adjusting bolt 44 is fitted into the bottomed hole 52. This bottomed hole 52
In this case, the side wall portion of the circular hole on the adjusting bolt 44 side whose center line is inclined with respect to the axis of the slider 50 at the same angle as the inclination angle of the conical surface 46 formed on the adjusting bolt 44 is removed. It was formed by. That is, in this embodiment, the inner peripheral surface of this circular hole is the bottom surface 54 of the bottomed hole 52.
and the conical surface 4 of the adjusting bolt 44
It forms an inclined surface that engages with 6. The diameter of this circular hole is such that the adjuster bolt 44 is connected to the bottomed hole 5.
2, the conical surface 46 and the bottom surface 54 are selected so that they can contact each other over as large an area as possible. Furthermore, by removing the side wall of the circular hole on the adjusting bolt 44 side as described above, the opening of the bottomed hole 52 extends parallel to the axial center of the slider 50 over most of its axial length. The adjustment bolt 44 is formed across the entire length so that the sliding movement of the slider 50 is not obstructed by the adjustment bolt 44.

Further, a threaded portion 58 of a bolt 56 inserted into the through hole 24 is screwed into the end of the slider 50 on the holder rear end side. The bolt 56 is urged toward the rear end of the holder by a compression coil spring 64 installed between its head 60 and an inward flange 62 formed on the inner peripheral surface of the through hole 24. . Therefore, the slider 50 is also biased by the spring 64 in a direction from the open end side of the tool insertion hole 18 toward the innermost side, and the tip end of the adjusting bolt 44 is fitted into the bottomed hole 52. In the closed state, the bottom surface 54 is kept in contact with the conical surface 46. That is, in this embodiment, the urging means is constituted by the bolt 56, the compression coil spring 64, and the like.

In the tool holder configured as described above, when the assembly is completed, the tip of the adjusting bolt 44 is fitted into the bottomed hole 52. However, during assembly, the slider 50
Either of the screwing of the bolt 56 and the screwing of the adjustment bolt 44 may be done first.
If you do the latter first, adjust the adjustment bolt 4.
4 and the bottomed hole 52 prevents the rotation of the slider 50, making it easy to screw the bolt 56 into the slider 50. The hole 20 and the through hole 24 are formed eccentrically from each other, and the slider 50 and the bolt 56 are not located on the same axis. It will not turn and bolt 56
Easy to screw together. In addition, like this, bolt 5
6 is screwed together first, the slider 50 is pulled deep into the small diameter hole 20 by the bias of the compression coil spring 64 and comes into contact with the inward flange 62. Even in this state, the opening of the bottomed hole 52 faces the female threaded hole 42 at the tip end of the holder, so when the adjuster bolt 44 is screwed in, the tip of the bottomed hole 52 faces the female threaded hole 42 . Insertion is not obstructed.

In the tool holder configured as described above, the insertion depth of the tool 32 can be adjusted as follows after loosening the tightening of the tool 32 by the set screw 28 to make the tool 32 movable in the axial direction. It will be done. That is, when the adjusting bolt 44 is screwed in, the bottom surface 54 is pushed by the conical surface 46 as the adjusting bolt 44 moves, the slider 50 is pushed out from the small diameter hole 20, and the tool 32 is also inserted into the tool insertion hole. It will be pushed out from 18. In addition, at this time, the conical surface 46 and the bottom surface 5
4 are in contact with each other over as large an area as possible as described above, so the surface pressure between the bottom surface 54 and the conical surface 46 is reduced, and the slider 50 is smoothly pushed out. Conversely, if the adjustment bolt 44 is loosened, the adjustment bolt 44 can be loosened.
4 is withdrawn from the bottomed hole 52, the slider 50 is pulled toward the inner side of the small diameter hole 20 by the spring 64.
The distance from the opening of the tool insertion hole 18 to the slider 50 is increased, and the tool 32 can be inserted deeply. Therefore, when adjusting the insertion depth of the tool 32 in the tool holder of this embodiment, the operator only needs to rotate the adjusting bolt 44 as appropriate while checking the amount of protrusion of the tool 32. By rotating the adjusting bolt 44 from the outside of the holder body 10 in the radial direction without removing the tool 32 from the holder, adjustment work can be performed extremely easily and quickly.

In addition, in this embodiment, since the small diameter hole portion 20 is formed at a position eccentric to the axis of the holder body 10, the female threaded hole 42 can be formed long, and a long adjustment bolt 44 can be screwed into the small diameter hole 20. By fitting, the adjuster bolt 44 fits into the bottomed hole 52.
Even if it is moved deeply inward, the amount of screw engagement with the female screw hole 42 will not be insufficient. Therefore, even if a force is applied to the slider 50 in the direction of pushing it into the small diameter hole 20 based on the axial force acting on the tool 32 during cutting, the adjuster bolt 44
has the advantage of being able to withstand that force.

Further, in this embodiment, the rotational force is transmitted to the tool 32 by the engagement between the half-moon key 40 and the keyway 30, but the half-moon key 40 and the keyway 30 are omitted. However, instead, a diametrically extending groove may be provided on the rear end surface of the tool 32, and the protruding end of the slider 50 from the small diameter hole 20 may be fitted into this groove to transmit the rotational force. Although the slider 50 has a circular cross section, the large diameter hole 22 and the small diameter hole 20 are formed at eccentric positions, and the tool 32
Since the slider 50 and the slider 50 are engaged with each other in an eccentric state, rotational force can also be transmitted to the tool 32 by the slider 50. In this case, it is necessary that the end of the slider 50 on the holder tip side protrudes a certain amount from the small-diameter hole 20 even when the slider 50 is most retracted into the small-diameter hole 20. , the depth of the groove formed on the rear end surface of the tool 32 is shallower than this minimum protrusion amount of the slider 50.
It is necessary to ensure that the tip end surface of the tool 32 is always in contact with the bottom surface of the groove formed in the tool 32.

Further, the fixing device for fixing the tool 32 to the holder includes a shank 34 of the setscrew 28 as described above.
It is possible to use various types of fixing devices, such as a collection chuck, in addition to the fixing device by abutting against the fixing device.

Although not illustrated individually, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a front view (partially in section) showing a tool holder that is an embodiment of the present invention. Figure 2 is the first
FIG. 3 is a left side view of the tool holder shown in the figure. Third
The figure is a front view showing a tool held by the same tool holder. 10: Holder body, 14: Mounting part, 16: Tool holding part, 18: Tool insertion hole, 32: Tool,
42: Female threaded hole, 44: Adjustment bolt, 4
6: Conical surface, 50: Slider (stopper member),
52: Bottomed hole, 54: Bottom surface (slanted surface), {56: Bolt, 64: Compression coil spring} biasing means.

Claims (1)

[Scope of Claims] 1. A holder body comprising a tool holding part and a mounting part, a tool insertion hole being formed in the axial direction from the distal end surface of the tool holding part, and fixed to a machine tool at the mounting part; a stopper member that is slidably fitted in the innermost part of the tool insertion hole in the axial direction and comes into contact with the tool to define the insertion depth when the tool is inserted into the tool insertion hole; A female threaded hole is formed in the part surrounding the stopper member, penetrating the part in an approximately radial direction, and an adjustment bolt is screwed into the female threaded hole and has a conical surface at the tip that becomes smaller in diameter toward the tip. and a side surface of the stopper member facing the adjuster bolt, which is arranged so as to move away from the female threaded hole in the axial direction of the holder body from the tip opening side of the tool insertion hole toward the innermost side, and , an inclined surface formed to be inclined at the same angle as the inclination angle of the conical surface of the adjusting bolt; and urging the stopper member in a direction from the tip opening side of the tool insertion hole toward the inner inner side; A tool holder comprising a biasing means for keeping the inclined surface in contact with the conical surface, and the insertion depth of the tool can be adjusted by rotating the adjusting bolt.