JP2574357Y2 - Straight shank, straight collet, and tool holder for rotary cutting tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straight shank, a straight collet, and a tool holder of a rotary cutting tool, and more particularly, to improve run-out accuracy and gripping force when a rotary cutting tool and a straight collet are mounted on a tool holder. It is about technology.

[0002]

2. Description of the Related Art The shank of a rotary cutting tool such as an end mill is roughly classified into a straight shank and a taper shank.
There are types of straight shanks, such as plain, flat, threaded, double flat, and combinations. Recently, straight shanks have been widely used due to the progress of tool holders and their ease of handling. Above all, most end mills having an outer diameter of 50 mm or less are plain, flat or threaded straight shanks. FIG. 8A is an example of a plain straight shank having a cylindrical shape, and FIG. 8B is an example of a flat straight shank in which a flat flat surface 80 is provided on an outer peripheral surface of a cylindrical shape. Is an example of a threaded straight shank in which a male screw 82 is provided at the shaft end.

[0003] On the other hand, when heavy cutting is performed with an end mill having a relatively large diameter, the gripping force is insufficient compared with the cutting resistance. Or the end mill or tool holder may be damaged. For this reason, for example, Japanese Utility Model Publication No. 63-7456 and Japanese Utility Model Publication No.
It is conceivable to increase the gripping force and prevent the straight shank from slipping out by providing a tapered portion on a part of the straight shank or providing a groove on the outer peripheral surface as described in Japanese Patent Publication No. ing.

[0004]

However, even in such a mounting structure of the straight shank and the tool holder, which can obtain a relatively large gripping force, the inner peripheral surface of the tool mounting hole of the tool holder and the outer peripheral surface of the straight shank. If dust or the like adheres to the surface, there is a problem that the runout accuracy and the grasping force are significantly reduced. Generally, at a processing site, since a cutting fluid mixed with fine chips and dust generated at the time of cutting is scattered, it is extremely difficult to prevent an oil film containing chips and the like from adhering to a tool or a tool holder. . Also,
Since the clearance between the tool holder and the straight shank is extremely small in order to ensure sufficient runout accuracy and gripping force, the insertion must be performed with the axes of both being aligned with high precision. Another problem was that the work was cumbersome and required considerable experience and skill. In addition,
Such a problem also occurs between the straight collet and the tool holder when the rotary cutting tool is attached to the tool holder via the straight collet.

[0005] The present invention has been made in view of the above circumstances, and its purpose is to enable a rotary cutting tool or a straight collet to be easily attached to a tool holder and to have sufficient runout accuracy and grasping power. To get it.

[0006]

A first means for achieving the above object is a rotating means which is fitted into a tool mounting hole of a tool holder from a shaft end and held so as to be relatively non-rotatable and unable to come out. A straight shank of a cutting tool, wherein an annular groove is provided on an outer peripheral surface near the shaft end, and a ring member having an outer diameter having flexibility larger than the diameter of the outer peripheral surface is fitted into the annular groove. and, and,
The outer diameter of the shaft end side from the annular groove is smaller than that of the annular groove.
It is characterized in that it is made smaller than the regular outer diameter of the part . The outer peripheral surface of the ring member is twisted spirally.
Preferably, a plurality of protrusions are provided.

[0007]

The function and effect of the first means is such that when the straight shank is fitted into the tool mounting hole of the tool holder from the shaft end, a flexible ring member fitted near the shaft end. Is pressed in close contact with the inner peripheral surface of the tool mounting hole, so that dirt such as fine chips, dust, oil film, etc. adhering to the inner peripheral surface of the tool mounting hole is wiped off. It is possible to prevent a decrease in runout accuracy and grasping force caused by the attachment of cutting chips and dust. In particular, the straight shank of the rotary cutting tool according to claim 2 , wherein a plurality of spirally twisted projections are provided on the outer peripheral surface of the ring member, while rotating the rotary cutting tool in a direction opposite to the twist direction of the projections. By inserting the straight shank into the tool mounting hole, the cleaning effect on the inner peripheral surface of the tool mounting hole can be further enhanced. The above-mentioned improvement in runout accuracy improves the finish surface roughness and machining accuracy, suppresses chatter vibration and enables heavy cutting, and the improvement in gripping force prevents the rotary cutting tool from slipping out and the rotary cutting tool itself. To prevent damage to workpieces, workpieces, tool holders, etc.

Further, since the ring member is brought into close contact with the inner peripheral surface of the tool mounting hole, the axis of the straight shank at that portion is aligned with the axis of the tool mounting hole. Becomes In particular, the outer diameter on the shaft end side of the annular groove in which the ring member is fitted is smaller than the regular outer diameter on the blade side than the annular groove, that is, smaller than or slightly smaller than the inner diameter of the tool mounting hole. according to the straight shank of a rotary cutting tool according to claim 1 which is small, insertion work of the tool attachment hole becomes more simple and easier.

Further, since the ring member is brought into close contact with the inner peripheral surface of the tool mounting hole in an elastically deformed state, an appropriate sliding resistance can be obtained by the frictional force, and the protrusion length from the tool holder can be reduced. Adjustment work becomes easy,
The rotary cutting tool is prevented from dropping when the rotary cutting tool is removed from the tool holder by loosening the shank tightening screw of the tool holder, etc., facilitating the insertion work into the tool mounting hole as described above. In addition, the work of attaching and detaching the rotary cutting tool can be performed quickly without any skill.

[0010]

A second means for achieving the above object is to form a cylindrical shape having a plurality of slits formed from one end and capable of reducing the diameter, and a tool from the other end. The rotary cutting tool cannot be rotated relative to the tool holder by being inserted into the tool mounting hole of the holder and reduced in diameter with the straight shank of the rotary cutting tool inserted inside the cylindrical shape. A straight collet which is attached so as not to come off, wherein an annular groove is provided on an outer peripheral surface near the other end, and a ring member having an outer diameter larger than the diameter of the outer peripheral surface is fitted in the annular groove. And from its annular groove
Also, the outer diameter of the other end is closer to the one end than the annular groove.
It is characterized in that it is smaller than the outer diameter of the rule . What
The outer peripheral surface of the ring member is spirally twisted.
Desirably, a strip projection is provided.

[0011]

When the straight collet is inserted into the tool mounting hole of the tool holder from the other end, a flexible ring member fitted near the other end is used. Since it is pushed in close contact with the inner peripheral surface of the tool mounting hole, dirt such as fine chips, dust, oil film, etc. adhered to the inner peripheral surface of the tool mounting hole is wiped off, and such cutting is performed. It is possible to prevent the accuracy and the gripping force from decreasing due to the adhesion of the dust and the like. In particular, the straight collet according to claim 4 , wherein a plurality of spirally twisted projections are provided on the outer peripheral surface of the ring member, is inserted into the tool mounting hole while rotating in the direction opposite to the twisting direction of the projections. Thus, the cleaning effect on the inner peripheral surface of the tool mounting hole can be further enhanced. The improvement of the runout accuracy improves the finished surface roughness and machining accuracy of the rotary cutting tool attached to the tool holder via the straight collet, and also suppresses chatter vibration to enable heavy cutting, improving gripping power. Prevents the straight collet from coming out of the tool holder and the rotary cutting tool from coming out of the straight collet, and prevents damage to the straight collet itself, the workpiece, the rotary cutting tool, the tool holder, and the like.

Further, since the ring member is brought into close contact with the inner peripheral surface of the tool mounting hole, the axis of the straight collet at that portion is aligned with the axis of the tool mounting hole, so that the straight collet can be easily inserted. Becomes In particular, the outer diameter of the other end side of the annular groove into which the ring member is fitted is smaller than the regular outer diameter of the one end side of the annular groove, that is, the same as or slightly smaller than the inner diameter of the tool mounting hole. According to the straight collet according to the third aspect of the present invention, the work of inserting the straight collet into the tool mounting hole becomes even easier and easier.

Further, since the ring member is brought into close contact with the inner peripheral surface of the tool mounting hole in an elastically deformed state, an appropriate sliding resistance is obtained by the frictional force and the collet tightening screw of the tool holder is loosened. As a result, the straight collet is prevented from dropping when the straight collet is removed from the tool holder, and together with the ease of insertion work into the tool mounting hole as described above, the straight collet can be removed from the tool holder. Attachment and removal can be performed quickly without skill.

[0014]

A third means for achieving the above object has a tool mounting hole into which a straight shank or a straight collet of a rotary cutting tool is fitted, and the rotary cutting tool or What is claimed is: 1. A tool holder for holding a straight collet so as to be relatively non-rotatable and unable to come out, and rotating and driving the straight collet. A ring member having flexibility smaller than the size is fitted in the annular groove, and has an opening that is smaller than the annular groove.
Side inside diameter is larger than the regular inside diameter inside its annular groove
Rot, characterized in that is. The ring member
Is provided with a plurality of helically twisted protrusions on its inner peripheral surface.
Is desirable.

[0015]

[Operation and effect of the third means] The tool holder to which the rotary cutting tool is directly mounted will be described. When the straight shank of the rotary cutting tool is fitted into the tool mounting hole, the inner periphery near the opening of the tool mounting hole is used. Since the flexible ring member fitted to the surface is brought into close contact with the outer peripheral surface of the straight shank, dirt such as fine chips, dust, and an oil film adhered to the outer peripheral surface of the straight shank is wiped off. This prevents a drop in the deflection accuracy and grasping power due to the attachment of cutting chips, dust, and the like. In particular, the tool holder according to claim 6 , wherein a plurality of spirally twisted protrusions are provided on the inner peripheral surface of the ring member, the straight shank is rotated while rotating the rotary cutting tool in a direction opposite to the twisting direction of the protrusions. The effect of cleaning the outer peripheral surface of the straight shank can be further enhanced by inserting it into the tool mounting hole. The above-mentioned improvement in runout accuracy improves the finish surface roughness and machining accuracy, suppresses chatter vibration and enables heavy cutting, and the improvement in gripping force prevents the rotating cutting tool from slipping out.
Prevents damage to the tool holder itself, workpiece, rotary cutting tool, etc.

Further, since the ring member is brought into close contact with the outer peripheral surface of the straight shank, the axis of the straight shank at that portion is aligned with the axis of the tool mounting hole, so that the work of inserting the straight shank is facilitated. . In particular, according to claim 5 ring member which is greater than or equal to slightly greater diameter and the outer diameter of the inner of the inner diameter of the normal than the annular groove, i.e. the straight shank inner diameter of the opening side of the annular groove is fitted According to the tool holder described in (1), the work of inserting the straight shank into the tool mounting hole becomes even easier and easier.

Further, since the ring member is brought into close contact with the outer peripheral surface of the straight shank in an elastically deformed state, an appropriate sliding resistance is obtained by the frictional force, and the protrusion length of the rotary cutting tool from the tool holder is obtained. Adjustment work becomes easier, and the rotary cutting tool is prevented from falling when the rotary cutting tool is removed from the tool holder by loosening the shank tightening screw of the tool holder.
As described above, in conjunction with facilitation of the work of inserting the rotary cutting tool into the tool mounting hole, the work of attaching and detaching the rotary cutting tool to and from the tool holder can be quickly performed without any skill.

In a tool holder to which a rotary cutting tool is mounted via a straight collet, the straight collet is mounted in advance in a tool mounting hole of the tool holder. According to the tool holder of the present invention in which a ring member is provided, when the straight collet is inserted into the tool mounting hole, the outer peripheral surface of the straight collet is cleaned by the ring member, and the same operation and effect as described above. Is obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view of an end mill 10 as a rotary cutting tool as viewed from a direction perpendicular to an axis. The end mill 10 includes a straight shank 12 and a blade 14 having a cylindrical shape. The straight shank 12
This is a portion that is fitted into a tool mounting hole of a tool holder (not shown) from the shaft end 16 side and is held so as to be relatively non-rotatable and not come out. The blade portion 14 is provided with an outer peripheral blade 18 at the outer peripheral portion thereof and a bottom blade 20 at the distal end portion.
Is provided.

The shaft end 16 of the straight shank 12
As shown in FIG. 2, an annular groove 22 is provided on the outer peripheral surface in the vicinity of the annular groove 22. A ring member 24 made of a fluorine resin having flexibility is fitted in the annular groove 22.
The outer peripheral surface of the ring member 24 has a triangular shape that is convex toward the outer peripheral side at the apex angle θ, and the diameter at the apex is the regular outer diameter of the straight shank 12, that is, the tool mounting hole of the tool holder. Diameter D equal to or slightly smaller than the inner diameter
_It is larger than ₁ and larger than the inner diameter of the tool mounting hole of the tool holder. The outer diameter D ₂ of the shaft end portion 16 side from the annular groove 22 of the straight shank 12 is slightly smaller than the diameter D ₁ of the above normal. To describe a specific example of the dimensions of each part shown in FIG. 2, D ₁ =
_{25 + 0~-0.013mm, D 2} = 25-0.040
~ -0.060 mm, t ₁ = 2 mm, t ₂ = 0.1 ±
0.05 mm, d ₁ = 2 mm, d ₂ = 3 mm, θ = 90
゜.

The ring member 24 is fixed to the annular groove 22 by an adhesive or the like as necessary. Further, a ring member made of a phenol resin, a polyamide resin, a polyacetal resin, or the like can be used instead of the fluorine resin.

The end mill 10 has a shaft end 16 of the straight shank 12 in a tool mounting hole of a tool holder.
It is used for cutting metal materials by being inserted from the side and being held so that it cannot rotate relative to it and cannot come out, and is attached to a main shaft such as a milling machine and driven to rotate around the axis together with a tool holder. In this embodiment, since the ring member 24 is provided near the shaft end 16, excellent runout accuracy and great grasping force can be obtained. That is, the ring member 24 is connected to the straight shank 12.
When the tool is inserted into the tool mounting hole of the tool holder, it is pushed in close contact with the inner circumferential surface of the tool mounting hole, so that fine chips and dust adhered to the inner circumferential surface of the tool mounting hole. In addition, dirt such as an oil film is wiped off, thereby preventing a decrease in runout accuracy and grasping force due to the attachment of chips and dust. The improvement of the runout accuracy improves the finished surface roughness and the processing accuracy, suppresses the occurrence of chatter vibration and enables heavy cutting. The improvement of the gripping force prevents the end mill 10 from coming out of the tool holder, Prevents damage to itself, workpiece, tool holder, etc.

Further, since the ring member 24 is brought into close contact with the inner peripheral surface of the tool mounting hole, the axis of the straight shank 12 at that portion is aligned with the axis of the tool mounting hole. The work of inserting into the mounting hole becomes easy. In particular, while the outer diameter D ₂ of the shaft end portion 16 side than the ring member 24 is smaller than the outer diameter D ₁ of the normal, the shaft end 16 that can be easily inserted into the tool attachment hole, the outer periphery of the ring member 24 Since the surface has a triangular shape, the ring member 24 is provided at the opening of the tool mounting hole.
When the slope of the outer peripheral surface is slid, the shaft end 16 of the straight shank 12 is centered, and the insertion operation is further simplified and easier.

Further, since the ring member 24 is brought into close contact with the inner peripheral surface of the tool mounting hole in an elastically deformed state, an appropriate sliding resistance can be obtained by the frictional force, and the end mill 10 can be removed from the tool holder. The work of adjusting the protruding length is facilitated, and the end mill 10 is prevented from dropping when the end mill 10 is removed from the tool holder by loosening the shank tightening screw of the tool holder. Along with the simplification of the work of inserting the end mill into the mounting hole, the work of mounting and removing the end mill 10 can be performed quickly without any skill.

Next, another embodiment of the present invention will be described.

In the embodiment shown in FIG. 3, an annular groove 28 having a groove width larger than that of the annular groove 22 is formed on the straight shank 12 of the end mill 10, and a plurality of spirally twisted protrusions 30 are formed on the outer peripheral surface. A wide ring member 32 provided is mounted. In this case, by inserting the straight shank 12 into the tool mounting hole while twisting the end mill 10 in the direction opposite to the twisting direction of the projection 30, in the embodiment, clockwise, the cleaning effect of the inner peripheral surface of the tool mounting hole is improved. Can be even higher.

The embodiment shown in FIG. 4 is an example in which the present invention is applied to a flat shank 38 provided with a flat flat surface 36 on a cylindrical outer peripheral surface. The ring member 2 is provided with an annular groove.
A ring member 42 similar to that of No. 4 is mounted. The embodiment of FIG. 5 is an example in which the present invention is applied to a threaded straight shank 48 provided with a male thread 46 at the shaft end. In the embodiment shown in FIG. A ring member 50 similar to the member 24 is mounted.

A ring member having a plurality of protrusions spirally twisted on the outer peripheral surface, like the ring member 32 of FIG. 3, is provided on the flat shank 38 with flat and the shank 48 with screw. Of course, it can be attached. The present invention is also applicable to other types of straight shank such as a double flat type and a combination.

FIG. 6 shows an embodiment of the straight collet of the present invention. The straight collet 54 has a cylindrical shape capable of reducing the diameter in which a plurality of slits 58 are formed from a flange 56 side, which is one end, and fits into a tool mounting hole of a tool holder (not shown) from the other end 60 side. In addition, the diameter of the rotary cutting tool is reduced while the straight shank of the rotary cutting tool is inserted inside the cylindrical shape, so that the rotary cutting tool is attached to the tool holder so that it cannot rotate relative to the tool holder and cannot come out. An annular groove 62 is provided on the outer peripheral surface near the other end 60, and a flexible ring member 64 made of a fluorine resin or the like is mounted in the annular groove 62. The outer peripheral surface of the ring member 64 has a triangular shape protruding toward the outer peripheral side, and the diameter at the apex is the same as the regular outer diameter of the straight collet 54, that is, the inner diameter of the tool mounting hole of the tool holder. It is larger than the slightly smaller diameter and larger than the inner diameter of the tool mounting hole of the tool holder. Further, the flange 56 is smaller than the annular groove 62 of the straight collet 54.
The outer diameter on the side is the regular outer diameter except for the thinned portion at the end of the slit 58, but the outer diameter on the other end 60 side of the annular groove 62 is larger than the regular outer diameter. It is slightly smaller.

In such a straight collet 54, when it is fitted into the tool mounting hole of the tool holder from the other end 60 side, the ring member 64 disposed near the other end 60 has the tool mounting hole. Since it is pushed in close contact with the inner peripheral surface of the tool, fine chips, dust, oil film, etc. adhered to the inner peripheral surface of the tool mounting hole are wiped off,
A decrease in the deflection accuracy and grasping force due to the attachment of the chips and dust is prevented. The improvement in the runout accuracy improves the finished surface roughness and machining accuracy of the rotary cutting tool attached to the tool holder via the straight collet 54, and suppresses the occurrence of chatter vibration to enable heavy cutting. The improvement prevents the straight collet 54 from coming out of the tool holder, and further prevents the rotary cutting tool from coming out of the straight collet 54, and prevents damage to the straight collet 54 itself, the workpiece, the rotary cutting tool, the tool holder, and the like.

Further, since the ring member 64 is brought into close contact with the inner peripheral surface of the tool mounting hole, the axis of the straight collet 54 at that portion is made to coincide with the axis of the tool mounting hole. The work of inserting into the mounting hole becomes easy. In particular, since the outer diameter of the other end 60 side than the ring member 64 is smaller than the regular outer diameter,
The other end 60 can be easily inserted into the tool mounting hole, while the outer peripheral surface of the ring member 64 has a triangular shape, so that the slope of the outer peripheral surface of the ring member 64 slides into the opening of the tool mounting hole. By being brought into contact, the other end portion 60 of the straight collet 54 is centered, and the insertion operation is further simplified and easier.

Further, since the ring member 64 is brought into close contact with the inner peripheral surface of the tool mounting hole in an elastically deformed state, an appropriate sliding resistance can be obtained by the frictional force, and the collet tightening screw of the tool holder can be used. The straight collet 54 is prevented from falling when the straight collet 54 is detached from the tool holder by loosening or the like, and the straight collet 54 can be easily inserted into the tool mounting hole as described above. Can be quickly performed without skill.

Although not shown, an annular groove having a groove width larger than that of the annular groove 62 is formed near the other end portion 60 as in the straight shank 12 in FIG. If a wide ring member provided with a plurality of projections twisted in a shape is attached to the annular groove and the straight collet 54 is inserted into the tool mounting hole while twisting the straight collet 54 in the direction opposite to the twisting direction of the projection, the tool The cleaning effect on the inner peripheral surface of the mounting hole is further enhanced.

FIG. 7 shows an embodiment of the tool holder according to the present invention. The tool holder 68 directly grips a straight shank of a rotary cutting tool such as an end mill, and has a tool mounting hole 70 into which the straight shank is inserted.
The rotary cutting tool is held so that it cannot rotate relatively and cannot come out, and is mounted on a main shaft such as a milling machine to be driven to rotate. An annular groove 74 is provided on the inner peripheral surface near the opening 72 of the tool mounting hole 70, and a flexible ring member 76 made of fluorine resin or the like is mounted in the annular groove 74. . The inner peripheral surface of the ring member 76 has a triangular shape that is convex toward the inner peripheral side.
Is smaller than the outer diameter of the straight shank of the rotary cutting tool, that is, smaller than the outer diameter of the straight shank of the rotary cutting tool, and smaller than the outer diameter of the straight shank. The inside diameter of the tool mounting hole 70 inside the annular groove 74 is the regular inside diameter, but the inside diameter of the opening 72 side of the annular groove 74 is slightly larger than the regular inside diameter.

In such a tool holder 68, when the straight shank of the rotary cutting tool is fitted into the tool mounting hole 70, the ring member 76 is brought into close contact with the outer circumferential surface of the straight shank. The dirt such as fine chips, dust, and an oil film adhered to the surface is wiped off, and a decrease in the deflection accuracy and grasping power due to the adhesion of the chips, dust, and the like is prevented. The improvement of run-out accuracy improves the finish surface roughness and machining accuracy, and suppresses the occurrence of chatter vibration to enable heavy cutting. The improvement of gripping force prevents the rotary cutting tool from slipping out and the tool holder 6
8 to prevent damage to itself, a workpiece, a rotary cutting tool, and the like.

Further, since the ring member 76 is brought into close contact with the outer peripheral surface of the straight shank, the axis of the straight shank at that portion is aligned with the axis of the tool mounting hole 70, so that the work of inserting the straight shank is easy. Becomes In particular, the opening 72 is
Since the inner diameter of the side is larger than the regular inner diameter, the straight shank can be easily inserted into the opening 72 of the tool mounting hole 70, while the inner peripheral surface of the ring member 76 has a triangular shape. The shaft end of the shank is centered by being brought into sliding contact with the slope of the inner peripheral surface of the ring member 76, so that the work of inserting the straight shank into the tool mounting hole 70 becomes even easier and easier.

Further, since the ring member 76 is brought into close contact with the inner peripheral surface of the tool mounting hole in an elastically deformed state, an appropriate sliding resistance is obtained by the frictional force, and the tool holder 68 of the rotary cutting tool is provided. The work of adjusting the protrusion length from the tool holder 68 is facilitated, and the fall of the rotary cutting tool when the rotary cutting tool is removed from the tool holder 68 by loosening the shank tightening screw of the tool holder 68 is prevented. As described above, in conjunction with the simplification of the work of inserting the rotary cutting tool into the tool mounting hole, the work of mounting and removing the rotary cutting tool can be performed quickly without any skill.

Although not shown, an annular groove having a groove width larger than that of the annular groove 74 is formed near the opening 72 like the straight shank 12 in FIG. If a wide ring member provided with a plurality of projections twisted in a shape is mounted in the annular groove, a straight shank is inserted into the tool mounting hole 70 while twisting the rotary cutting tool in a direction opposite to the twisting direction of the projections. By doing so, the effect of cleaning the outer peripheral surface of the straight shank can be further enhanced.

In the above embodiment, the tool holder 68 for directly holding the rotary cutting tool has been described. However, the present invention can be applied to a tool holder to which the rotary cutting tool is attached via a straight collet.

Although several embodiments of the present invention have been described in detail with reference to the drawings, these are merely specific examples, and the present invention may be variously modified based on the knowledge of those skilled in the art.
It can be implemented in an improved manner.

[Brief description of the drawings]

FIG. 1 is a view showing an end mill as a rotary cutting tool according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a part of the end mill shown in FIG.

FIG. 3 is a partially cutaway view showing a portion near a shaft end of a straight shank of an end mill according to another embodiment of the present invention.

FIG. 4 is a partially cutaway view showing an example in which the present invention is applied to a straight shank with a flat.

FIG. 5 is a partially cutaway view showing an example in which the present invention is applied to a threaded straight shank.

FIG. 6 is a partially cutaway view showing a straight collet according to an embodiment of the present invention.

FIG. 7 is a partially cutaway view showing a main part of a tool holder according to an embodiment of the present invention.

FIG. 8 is a diagram showing a typical example of a conventional straight shank.

[Explanation of symbols]

 10: End mill (rotary cutting tool) 12, 38, 48: Straight shank 22, 28: Annular groove 24, 32, 42, 50: Ring member 30: Projection 54: Straight collet 62: Annular groove 64: Ring member 68: Tool Holder 70: Tool mounting hole 74: Annular groove 76: Ring member

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23B 51/00 B23B 31/20 B23Q 3/12

Claims (6)

(57) [Scope of request for utility model registration] 1. A straight shank of a rotary cutting tool which is fitted into a tool mounting hole of a tool holder from a shaft end and held so as to be relatively nonrotatable and unable to come out, wherein an annular groove is formed in an outer peripheral surface near the shaft end. Is provided, and a ring member having flexibility whose outer diameter is larger than the diameter of the outer peripheral surface is fitted in the annular groove , and
The outer diameter of the shaft end side with respect to the groove is the positive diameter of the blade side with respect to the annular groove.
A straight shank for a rotary cutting tool, characterized in that the diameter is smaller than the outer diameter of the rule . 2. An outer peripheral surface of the ring member is spirally screwed.
2. The circuit according to claim 1, wherein a plurality of protrusions are provided.
Straight shank for rolling cutting tools. 3. A shrink having a plurality of slits formed from one end.
The tool of the tool holder is formed from the other end by forming a cylindrical shape with a diameter
While being fitted into the mounting hole, it is turned inside the cylindrical shape.
Shrink with the straight shank of the rolling cutting tool inserted
By being diametered, the rotary cutting tool can be attached to the tool holder.
A strike that cannot be rotated relative to
A rate collet, wherein an annular groove is provided on an outer peripheral surface near the other end.
The outer diameter has a greater flexibility than the diameter of the outer peripheral surface.
A ring member is fitted in the annular groove;
The outer diameter of the other end side of the groove is smaller than that of the annular groove.
Characterized in that it is smaller than the regular outer diameter on the side
Straight collet. 4. An outer peripheral surface of the ring member is spirally threaded.
4. The slide according to claim 3, wherein a plurality of protrusions are provided.
Treat collet. 5. A straight shank of a rotary cutting tool or
A tool mounting hole into which the straight collet is inserted;
Rotary cutting tools or straight collets cannot be rotated relative to each other
And a tool holder for holding the tool so as not to come out, wherein an annular groove is provided on an inner peripheral surface near an opening of the tool mounting hole.
And the inner diameter is smaller than the diameter of the inner peripheral surface.
A ring member having elasticity is fitted in the annular groove, and
The inner diameter on the opening side of the annular groove is smaller than that of the annular groove.
The inner diameter is larger than the regular inner diameter.
Tool holder. 6. A spirally threaded inner peripheral surface of said ring member.
6. The process according to claim 5, wherein a plurality of projections are provided.
Tool holder.