JP2023005383A - rotary cutting tool - Google Patents

Abstract

To certainly attach a cutting tool body to a tip end portion of an arbor even when a diameter of an attaching projection part projected out from a tip end surface of the arbor and a diameter of an attaching recessed part recessed on an attaching surface of the arbor side of the cutting tool body are different.SOLUTION: A rotary cutting tool fits in an attaching projection part 22 projected out from a tip end surface 21 of an arbor 20 in an attaching recessed part 12 recessed on an attaching surface 11 of a cutting tool body 10, thereby attaching the cutting tool body to a tip end portion of the arbor. In the rotary cutting tool, in the attaching recessed portion of the cutting tool body in which the attaching projection part projected out from the tip end surface of the arbor is fitted, fit-in step portions 12a and 12b having different recessed part diameters are provided, and a recessed part diameter Db of the fit-in step portion 12b on the arbor side is made to be larger than a recessed part diameter Da of the fit-in step portion 12a on the tip end side.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a rotary cutting tool having a cutting tool body attached to the tip of a rotating arbor. In particular, a rotary cutting tool that attaches the cutting tool body to the tip of the arbor by fitting the mounting projection projecting from the tip surface of the arbor into the mounting recess that is recessed in the mounting surface on the arbor side of the cutting tool body. , a plurality of arbors having mounting projections protruding from the tip end surface of the arbor with different diameters can be mounted by fitting into mounting recesses in one cutting tool body, and on the mounting surface on the arbor side of the cutting tool body It is characterized in that the cutting tool bodies having mounting recesses with different recess diameters can be mounted by fitting to the mounting projection projecting from the tip end face of one arbor.

BACKGROUND ART Conventionally, a rotary cutting tool having a cutting tool body attached to the tip of a rotating arbor has been used.

In such a rotary cutting tool, as shown in Patent Documents 1 and 2, etc., a mounting projection projecting from the tip surface of the arbor is recessed in the mounting surface of the cutting tool body on the arbor side. The key portion, which is fitted into the mounting recess and protrudes from the front end surface of the arbor on the outer peripheral side of the mounting protrusion, is engaged with the key groove provided on the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess. and inserting a mounting bolt from the tip of the cutting tool body through a mounting hole penetrating the cutting tool body and screwing it into a threaded hole provided in the arbor to mount the cutting tool body on the arbor with the mounting bolt. It is shown.

Here, in such a rotary cutting tool, the diameter of the mounting projection projecting from the tip surface of the arbor and the diameter of the mounting recess formed in the mounting surface of the cutting tool body on the arbor side are generally It is standardized based on the size of the arbor and the cutting tool body, etc. If the diameter of the mounting protrusion on the arbor and the diameter of the mounting recess on the cutting tool body are different, It was difficult to attach the cutting tool body to the arbor by fitting the mounting protrusions into the mounting recesses of the cutting tool body.

For this reason, it is necessary to prepare and assemble a large number of arbors and cutting tool bodies that conform to the same standards, which raises the problem of high production costs and cumbersome storage and management. .

Conventionally, in order to change the diameter of the mounting projection projecting from the tip surface of the arbor, a plunge conversion adapter (manyo arbor) having a mounting projection with a diameter different from that of the mounting projection on the tip surface of the arbor has been used. Tool Co.: FMP plunge conversion adapter) is attached to the tip of the arbor.

However, when a plunge conversion adapter is attached to the tip of the arbor in this way, the length of the protruding portion of the arbor becomes long. This caused problems such as the inability to perform stable cutting.

Conventionally, a ring-shaped conversion sleeve used for a commercially available face mill arbor (manufactured by Manyo Tool Co., Ltd.: FM face mill arbor) has been shown, and the key groove provided in this conversion sleeve is attached to the arbor Attach the conversion sleeve to the outer periphery of the mounting protrusion on the tip surface of the arbor so that it fits into the key provided on the tip surface of the arbor, and increase the diameter of the mounting protrusion on the tip surface of the arbor by the thickness of the conversion sleeve. An increasing one is shown.

However, when the conversion sleeve is attached to the outer periphery of the mounting projection projecting from the tip surface of the arbor in this way, the diameter of the mounting projection on the tip surface of the arbor fitted into the mounting recess provided in the cutting tool body is converted. It increases by the thickness of the sleeve, and it is difficult to use when the difference between the diameter of the mounting recess in the cutting tool body and the diameter of the mounting protrusion in the arbor is small. The height varies depending on the standard depending on the diameter of the mounting projection, but even if a conversion sleeve is used, the width and height of the key do not change, so it can be used for various cutting tool bodies with different key grooves. There was also the problem that it would be difficult to

JP-A-5-237716 Japanese Utility Model Laid-Open No. 63-131316

According to the present invention, a cutting tool body is attached to the tip of the arbor by fitting the mounting projection protruding from the tip surface of the arbor into the mounting recess formed in the arbor-side mounting surface of the cutting tool body. The object of the present invention is to solve the above-described problems in the rotary cutting tool.

That is, the present invention provides a rotary cutting tool as described above, in which a plurality of arbors having mounting protrusions projecting from the tip surface of the arbor with different diameters can be fitted and mounted in mounting recesses in one cutting tool body. In addition, each cutting tool body having a different diameter of the mounting recess formed in the mounting surface of the cutting tool body on the arbor side can be fitted and mounted to the mounting projection protruding from the tip surface of one arbor. The challenge is to make it possible.

In the first rotary cutting tool according to the present invention, in order to solve the above-mentioned problems, a mounting projection projecting from the tip surface of the rotating arbor is recessed in the mounting surface of the cutting tool body on the arbor side. In the rotary cutting tool in which the cutting tool body is attached to the tip of the arbor by fitting into the mounting recess formed in the mounting recess, the mounting recess of the cutting tool body into which the mounting projection protruding from the tip surface of the arbor is fitted has a recess diameter A plurality of different fitting stepped portions are provided, and the recessed portion diameter of the fitting stepped portion on the arbor side is made larger than the recessed portion diameter of the fitting stepped portion on the tip side.

In the above-mentioned rotary cutting tool, when the diameter of the mounting projection protruding from the tip surface of the arbor is small and corresponds to the fitting stepped portion with the small diameter of the recess on the tip side of the mounting recess of the cutting tool body, A small-diameter mounting convex portion protruding from the tip surface of the arbor is fitted into a fitting stepped portion with a small diameter of the concave portion on the tip side of the mounting concave portion of the cutting tool body, and the tip surface of the arbor is attached to the arbor side of the cutting tool body. A key portion is provided on the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess so as to abut against the mounting surface and protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion. The cutting tool body is attached to the tip of the arbor so as to be engaged with the key groove.

In this way, even if the diameter of the mounting protrusion protruding from the tip surface of the arbor is small, it can be reliably fitted into the fitting stepped portion having the small diameter of the recess on the tip side of the mounting recess of the cutting tool body. The cutting tool body can be easily and reliably attached to the part without rattling.

Further, in the above rotary cutting tool, when the diameter of the mounting projection protruding from the tip surface of the arbor is large and corresponds to the fitting stepped portion with the large diameter of the recess on the arbor side in the mounting recess of the cutting tool body, When fitting the large-diameter mounting convex portion protruding from the tip surface of the arbor into the fitting stepped portion with the large-diameter concave portion on the arbor side of the mounting concave portion of the cutting tool body, the tip surface of the arbor and the mounting surface of the cutting tool body are aligned. An adjustment key groove provided on the end surface of the adjustment ring on the arbor side so as to sandwich the adjustment ring between and the key groove provided on the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess is engaged with the adjustment key portion provided on the end face of the adjustment ring on the cutting tool body side. Then, the cutting tool body is attached to the tip of the arbor.

With this arrangement, even when the diameter of the mounting projection protruding from the tip surface of the arbor is large, the arbor can be reliably fitted into the fitting stepped portion having the large diameter of the recess on the arbor side of the mounting recess of the cutting tool body. An adjustment ring is sandwiched between the tip surface of the arbor and the mounting surface of the cutting tool body, and the cutting tool is attached to the tip of the arbor so that there is no gap between the tip surface of the arbor and the mounting surface of the cutting tool body. The main body can be attached easily and securely without rattling.

In the second rotary cutting tool according to the present invention, in order to solve the above-described problems, a mounting projection protruding from the tip surface of the rotating arbor is provided on the arbor-side mounting surface of the cutting tool body. A rotary cutting tool in which a cutting tool body is attached to the tip of an arbor by being fitted into a recessed attachment recess, wherein a plurality of mounting stepped portions having different diameters are provided on the mounting projection projecting from the tip surface of the arbor, The diameter of the mounting stepped portion on the tip surface side of the arbor is made larger than the diameter of the mounting stepped portion on the cutting tool main body side.

In the above-mentioned rotary cutting tool, the diameter of the recess on the tip side of the mounting recess of the cutting tool body is large, and the mounting projection projecting from the tip face of the arbor corresponds to the mounting step portion with the large diameter on the tip face side. In this case, the stepped portion of the mounting projection protruding from the tip surface of the arbor, which has a large diameter on the tip surface side, is fitted into the mounting recess of the cutting tool body, and the tip surface of the arbor is attached to the arbor of the cutting tool body. A key portion provided so as to abut on the mounting surface of the side and protrude from the tip surface of the arbor on the outer peripheral side of the mounting protrusion is attached to the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess. The cutting tool body is attached to the tip of the arbor so as to be engaged with the provided keyway.

With this configuration, even when the diameter of the recess on the tip side of the mounting recess of the cutting tool body is large, the stepped portion of the mounting projection projecting from the tip face of the arbor and having a large diameter on the tip face side is securely fitted. , the cutting tool body can be easily and reliably attached to the tip of the arbor without rattling.

Further, in the rotary cutting tool, the diameter of the concave portion on the tip side of the mounting concave portion of the cutting tool body is small, and the stepped portion of the mounting convex portion protruding from the tip surface of the arbor has a small diameter on the cutting tool body side. In the corresponding case, when fitting the small-diameter mounting step on the cutting tool body side of the mounting protrusion protruding from the tip surface of the arbor into the mounting recess of the cutting tool body, the tip surface of the arbor and the cutting tool body A key portion is provided on the arbor-side end surface of the adjustment ring so as to project from the tip surface of the arbor on the outer peripheral side of the mounting convex portion. The adjustment key portion provided on the cutting tool body side end surface of the adjustment ring is engaged with the key groove provided on the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess. The cutting tool body is attached to the distal end of the arbor by engaging them.

With this configuration, even when the diameter of the recess on the tip side of the mounting recess of the cutting tool body is small, the mounting step portion with the small diameter on the side of the cutting tool body in the mounting projection protruding from the tip surface of the arbor can be used as the cutting tool. It is securely fitted into the mounting recess of the main body, and an adjustment ring is sandwiched between the tip surface of the arbor and the mounting surface of the cutting tool body, so that a gap is formed between the tip surface of the arbor and the mounting surface of the cutting tool body. By preventing this from occurring, the cutting tool body can be easily and reliably attached to the tip of the arbor without rattling.

In the first rotary cutting tool according to the present invention, a plurality of fitting stepped portions having different recess diameters are provided in the mounting recesses of the cutting tool body into which the mounting projections protruding from the tip surface of the arbor are fitted. Since the diameter of the concave portion of the fitting stepped portion is made larger than the diameter of the concave portion of the fitting stepped portion on the distal end side, even when using a plurality of arbors having different diameters of the mounting projections protruding from the distal end surface of the arbor, each of these arbors can be used. The mounting projection projecting from the tip surface of the arbor can be reliably fitted into the mounting recess in one cutting tool body, and the one cutting tool body can be used for a plurality of arbors having different diameters of the mounting projections. It can be easily and easily attached to the tip of the device without rattling.

In the second rotary cutting tool according to the present invention, a plurality of mounting stepped portions having different diameters are provided on the mounting convex portion projecting from the tip surface of the arbor, and the diameter of the mounting stepped portion on the tip surface side of the arbor is equal to that of the cutting tool. Since the diameter of the mounting step on the tool body side is made larger than the diameter of the mounting stepped portion, one arbor can be used for each cutting tool body having a different diameter of the mounting recess formed in the mounting surface on the arbor side of the cutting tool body. The mounting projection projecting from the tip surface can be reliably fitted into the mounting recess in each cutting tool body, and a plurality of cutting tool bodies having different recess diameters of the mounting recess can be mounted at the tip of one arbor. In addition, it can be easily attached without rattling.

1 is a schematic perspective view showing an arbor used in a rotary cutting tool according to Embodiment 1 of the present invention; FIG. The arbor used in the rotary cutting tool according to the first embodiment is shown, (A) is a schematic plan view showing an arbor having a mounting projection with a small diameter, and (B) is an arbor having a mounting projection with a large diameter. 1 is a schematic plan view; FIG. FIG. 2 is a schematic cross-sectional explanatory view showing a cutting tool body used in the rotary cutting tool according to Embodiment 1; FIG. 4 is a schematic explanatory view showing a state before a cutting tool body is attached to a tip portion of an arbor having a mounting projection with a small diameter in the rotary cutting tool according to Embodiment 1; In the rotary cutting tool according to the first embodiment, the mounting convex portion of the arbor having a small diameter of the mounting convex portion is fitted to the fitting stepped portion having a small diameter of the concave portion on the tip side of the mounting concave portion of the cutting tool body. FIG. 4 is a schematic explanatory diagram showing a state where a cutting tool body is attached to the tip of an arbor having a small diameter. 1 is a schematic perspective view showing an adjusting ring used in the rotary cutting tool according to Embodiment 1 of the present invention; FIG. In the rotary cutting tool according to the first embodiment, when the cutting tool body is attached to the distal end portion of the arbor having a mounting projection with a large diameter, the adjustment ring is arranged between the arbor and the cutting tool body. It is a schematic explanatory drawing. In the rotary cutting tool according to the first embodiment, a mounting projection having a large diameter protruding from the tip surface of the arbor is projected through the through hole of the adjustment ring, and this mounting projection is recessed in the mounting surface of the cutting tool body. The tip of the arbor having a large diameter mounting protrusion is fitted into the fitting stepped portion having a large recess diameter in the mounting recess, and the adjustment ring is sandwiched between the tip surface of the arbor and the mounting surface of the cutting tool body. It is a schematic explanatory view showing a state in which the cutting tool body is attached to the. Fig. 10 is a schematic perspective view showing a state in which two mounting stepped portions having different diameters are provided on a mounting projection protruding from the tip surface of the arbor used for the rotary cutting tool according to Embodiment 2 of the present invention. Shows the cutting tool body used in the rotary cutting tool according to the second embodiment, (A) is a schematic cross-sectional explanatory view showing a cutting tool body with a large recess diameter of the mounting recess, (B) is the recess diameter of the mounting recess 1 is a schematic cross-sectional explanatory view showing a cutting tool body with a small . In the rotary cutting tool according to Embodiment 2, the state before attaching the cutting tool body having the mounting recess with a large recess diameter to the tip of the arbor having the mounting protrusion provided with two mounting steps having different diameters. It is a schematic explanatory diagram showing the. In the rotary cutting tool according to the second embodiment, the cutting tool body having a mounting recess with a large recess diameter is fitted to the mounting step having a large diameter at the mounting projection, and is attached to the tip of the arbor. It is a schematic explanatory drawing. In the rotary cutting tool according to the second embodiment, when attaching a cutting tool body having a mounting recess with a small recess diameter to the tip of an arbor having a mounting projection provided with two mounting steps having different diameters, the arbor and a cutting tool main body. FIG. In the rotary cutting tool according to the second embodiment, the large-diameter mounting stepped portion of the mounting projection projecting from the tip surface of the arbor is inserted into the through hole of the adjusting ring, and the small-diameter mounting stepped portion is removed from the adjusting ring. The small-diameter mounting step portion is fitted into the mounting recess formed in the mounting surface of the cutting tool body, and the adjustment ring is sandwiched between the tip surface of the arbor and the mounting surface of the cutting tool body. 3 is a schematic explanatory view showing a state in which a cutting tool body having a mounting recess with a small recess diameter is attached to the tip of an arbor; FIG.

A rotary cutting tool according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings. In addition, the rotary cutting tool in the present invention is not particularly limited to those shown in the following embodiments, and can be modified as appropriate without changing the gist thereof.

[Embodiment 1]
In the rotary cutting tool according to the first embodiment, as shown in FIG. 1, the arbor 20 has a mounting convex portion 22 projecting forward from the central portion of the tip surface 21 thereof, and an outer circumference of the mounting convex portion 22. A key portion 23 protrudes forward from a front end surface 21 on the side, and a threaded hole 24 is provided in the central portion of the mounting projection 22 .

In the first embodiment, as shown in FIGS. 2A and 2B, the arbor 20 has different mounting projections 22 protruding from the tip surface 21 of the arbor 20, and the mounting projections 22a The arbor 20A has a small diameter da and has a key portion 23a corresponding to this small diameter da, and the arbor 20B has a large diameter db of the mounting convex portion 22b and has a key portion 23b corresponding to this large diameter db. is used.

On the other hand, in the cutting tool body 10 attached to the two arbors 20A and 20B, as shown in FIG. , Db are provided, and the recess diameter Da of the fitting step 12a on the tip side of the cutting tool body 10 is made smaller than the recess diameter Db of the fitting step 12b on the arbor 20 side, and the tip The recess diameter Da of the fitting stepped portion 12a on the side corresponds to the small diameter da of the mounting projection 22a of the arbor 20A, and the recess diameter Db of the fitting stepped portion 12b on the arbor 20B corresponds to the mounting projection 22b of the arbor 20B. is adapted to a large diameter db.

In addition, in this cutting tool body 10, a key groove 13 for engaging the key portion 23a of the arbor 20A is provided on the outer peripheral side portion of the mounting recess 12 provided on the mounting surface 11 on the side of the arbor 20. Further, a mounting hole 14 is provided through the mounting recess 12 from the tip side of the central portion of the cutting tool body 10, and a plurality of cutting inserts 15 can be exchanged at the tip portion of the cutting tool body 10 at required intervals in the circumferential direction. installed.

Here, in the rotary cutting tool according to the first embodiment, when the cutting tool body 10 is attached to the tip portion of the arbor 20A in which the diameter da of the attachment projection 22a is small, as shown in FIG. Mounting protrusions 22a protruding from the tip surface 21 of 20A are arranged so as to face mounting recesses 12 recessed in the mounting surface 11 of the cutting tool body 10 .

Then, as shown in FIG. 5, the mounting projection 22a protruding from the tip surface 21 of the arbor 20A is inserted into the mounting recess 12 formed in the mounting surface 11 of the cutting tool body 10, and the mounting recess 12 is inserted into the mounting recess 12. , the tip surface 21 of the arbor 20A is brought into contact with the mounting surface 11 of the cutting tool body 10, and the arbor projected forward on the outer peripheral side of the mounting convex portion 22a The key portion 23a of 20A is engaged with the key groove 13 provided in the portion of the mounting recess 12 of the cutting tool body 10 on the outer peripheral side.

Thereafter, in the above-described state, the mounting bolt 1 is screwed into the screw hole 24 provided in the arbor 20A through the mounting hole 14 provided in the central portion of the cutting tool body 10, and the cutting tool body 10 is attached to the bolt head of the mounting bolt 1. The cutting tool main body 10 is attached to the tip portion of the arbor 20 by sandwiching it between 1a and the tip surface 21 of the arbor 20A.

In this way, the cutting tool main body 10 can be easily and reliably attached to the tip of the arbor 20A having the small diameter da of the attachment projection 22a without looseness.

On the other hand, in the rotary cutting tool according to Embodiment 1, when the cutting tool body 10 is attached to the tip of the arbor 20B having the mounting projection 22b with a large diameter db, as shown in FIG. Using an adjustment ring 30 provided with a through hole 31 for inserting the mounting protrusion 22b of 20B, the key portion 23b provided on the tip surface 21 of the arbor 20B is engaged with the surface of the adjustment ring 30 facing the arbor 20B. While an adjustment key groove 32 for fitting is provided, a cylindrical adjustment key portion 33 that engages with the key groove 13 provided on the cutting tool body 10 is provided on the surface of the adjustment ring 30 facing the cutting tool body 10. there is

Here, in the rotary cutting tool according to Embodiment 1, when attaching the cutting tool main body 10 to the tip portion of the arbor 20B having a mounting projection 22b with a large diameter db, as shown in FIG. The adjustment ring 30 is arranged between the tip surface 21 of the arbor 20B projecting the portion 22b and the mounting surface 11 of the cutting tool body 10 having the mounting recess 12 formed therein.

Then, as shown in FIG. 8, the mounting protrusion 22b protruding from the tip surface 21 of the arbor 20B is protruded toward the cutting tool body 10 through the through hole 31 of the adjustment ring 30, and the arbor 20B is The key portion 23 b provided on the tip surface 21 is engaged with the adjustment key groove 32 of the adjustment ring 30 , and in this state, the mounting convex portion 22 b protruding through the through hole 31 of the adjustment ring 30 is attached to the cutting tool body 10 . It is inserted into the mounting recess 12 formed in the mounting surface 11 and fitted into the fitting step portion 12b having a large recess diameter Db in the mounting recess 12, and the surface of the adjustment ring 30 facing the cutting tool body 10. The adjustment key portion 33 protruding from is engaged with the key groove 13 provided in the cutting tool body 10, and the adjustment ring 30 is engaged with the tip surface 21 of the arbor 20B and the mounting surface 11 of the cutting tool body 10. be sandwiched between

Thereafter, in the above-described state, the mounting bolt 1 is screwed into the screw hole 24 provided in the arbor 20B through the mounting hole 14 provided in the central portion of the cutting tool body 10, and the cutting tool body 10 is attached to the bolt head of the mounting bolt 1. The cutting tool main body 10 is attached to the tip portion of the arbor 20 by sandwiching it between 1a and the tip surface 21 of the arbor 20A.

In this way, when the cutting tool body 10 is attached to the distal end portion of the arbor 20B in which the diameter db of the mounting convex portion 22b is large, the above-described gap between the distal end surface 21 of the arbor 20B and the mounting surface 11 of the cutting tool body 10 is formed. With the adjustment ring 30 sandwiched, the cutting tool body 10 can be easily and reliably attached to the tip of the arbor 20B having a large diameter db of the attachment projection 22b without looseness.

[Embodiment 2]
In the rotary cutting tool according to the second embodiment, as shown in FIG. 9, the arbor 20 has two mounting step portions 22x and 22y having different diameters d on the mounting convex portion 22 projecting from the central portion of the tip surface 21 thereof. The arbor 20C is used in which the diameter dx of the mounting step portion 22x on the tip surface 21 side of the arbor 20 is larger than the diameter dy of the mounting step portion 22y on the cutting tool body 10 side. Also in this arbor 20C, similarly to the arbor 20 of the first embodiment, the key portion 23 protrudes forward from the end surface 21 on the outer peripheral side of the mounting projection 22, and the mounting A screw hole 24 is provided in the central portion of the protrusion 22 .

On the other hand, as the cutting tool body 10 attached to the arbor 20, in this second embodiment, as shown in FIGS. Using two types of cutting tool bodies 10X and 10Y with different recess diameters Dx and Dy, the recess diameter Dx of the mounting recess 12 in the cutting tool body 10X is made larger than the recess diameter Dy of the mounting recess 12 in the cutting tool body 10Y. The recess diameter Dx of the mounting recess 12 in the cutting tool body 10X corresponds to the diameter dx of the mounting step 22x on the tip surface 21 side of the arbor 20, while the recess diameter Dy of the mounting recess 12 in the cutting tool body 10Y corresponds to the diameter dy of the mounting step portion 22y of the arbor 20 on the cutting tool body 10 side.

Further, in the cutting tool bodies 10X and 10Y, key grooves 13x for engaging the key portions 23 and the like of the arbor 20 with the outer peripheral portion of the mounting recess 12 provided in the mounting surface 11 on the side of the arbor 20, 13y, and mounting holes 14 passing through the mounting recesses 12 from the tip side of the central portions of the cutting tool bodies 10X and 10Y are provided. of cutting inserts 15 are replaceably attached.

Here, in the rotary cutting tool of Embodiment 2, when attaching the cutting tool body 10X having a large recess diameter Dx of the attachment recess 12 to the tip of the arbor 20, as shown in FIG. The mounting protrusion 22 protruding from the tip surface 21 is arranged to face the mounting recess 12 formed in the mounting surface 11 of the cutting tool body 10X.

Then, as shown in FIG. 12, the mounting projection 22 protruding from the tip surface 21 of the arbor 20 is inserted into the mounting recess 12 formed in the mounting surface 11 of the cutting tool body 10X. The mounting step portion 22x having a diameter dx on the side of the tip surface 21 of the arbor 20 corresponding to the recess diameter Dx is fitted into the mounting recess 12 having the recess diameter Dx in the cutting tool body 10X, and the tip surface 21 of the arbor 20 is fitted to the cutting tool. A key portion 23 of the arbor 20 that abuts against the mounting surface 11 of the main body 10 and protrudes forward on the outer peripheral side of the mounting convex portion 22 is provided on the outer peripheral side portion of the mounting concave portion 12 of the cutting tool body 10X. is engaged with the keyway 13x provided.

Thereafter, in the above-described state, the mounting bolt 1 is screwed into the screw hole 24 provided in the arbor 20 through the mounting hole 14 provided in the central portion of the cutting tool body 10X, and the cutting tool body 10X is attached to the bolt head of the mounting bolt 1. The cutting tool main body 10X is attached to the tip portion of the arbor 20 so as to be sandwiched between 1a and the tip surface 21 of the arbor 20. - 特許庁

In this manner, the mounting step portion 22x having a large diameter dx on the tip surface 21 side of the mounting projection 22 of the arbor 20 is fitted in the mounting recess 12 of the cutting tool body 10X having a large recess diameter Dx. The cutting tool body 10X having a large diameter can be easily and reliably attached to the tip of the arbor 20A without rattling.

On the other hand, in the rotary cutting tool according to the second embodiment, when attaching the cutting tool main body 10Y having a small recess diameter Dy of the mounting recess 12 to the tip of the arbor 20, as shown in FIG. As with the adjustment ring 30, a through hole 31 is provided in the center for inserting a stepped mounting portion 22x having a large diameter dx and through which a stepped mounting portion 22y having a large diameter dy is inserted in the mounting convex portion 22 projecting from the tip surface 21 of the arbor 20. An adjustment ring 30 is provided on a portion of the arbor 20, and an adjustment key groove 32 for engaging a key portion 23 provided on the tip surface 21 of the arbor 20 is provided on the surface of the adjustment ring 30 facing the arbor 20. The adjusting ring 30 is provided with a cylindrical adjusting key portion 33 that engages with the key groove 13y provided in the cutting tool body 10Y on the surface facing the cutting tool body 10Y.

In the rotary cutting tool according to the second embodiment, as shown in FIG. 13, the tip surface 21 of the arbor 20 having the mounting projections 22 projected therefrom and the cutting tool main body 10Y having the mounting recesses 12 formed therein are attached. The adjustment ring 30 is arranged between the surface 11 and the surface 11 .

Next, as shown in FIG. 14, the mounting stepped portion 22x of the mounting projection 22 projecting from the tip surface 21 of the arbor 20 is inserted into the through hole 31 of the adjustment ring 30, and the mounting projection 22 is The mounting step portion 22y is projected toward the cutting tool main body 10Y, and the key portion 23 provided on the tip surface 21 of the arbor 20 is engaged with the adjustment key groove 32 of the adjustment ring 30. The mounting stepped portion 22y protruding through the through hole 31 is fitted into the mounting recess 12 having a recess diameter Dy provided in the mounting surface 11 of the cutting tool body 10Y, and the adjustment ring 30 is positioned on the cutting tool body 10Y side. The adjustment key portion 33 protruding outward is engaged with the key groove 13y provided in the cutting tool body 10Y, and the adjustment ring 30 is engaged with the tip surface 21 of the arbor 20 and the mounting surface 11 of the cutting tool body 10Y. be sandwiched between

In this state, the mounting bolt 1 is screwed into the screw hole 24 provided in the arbor 20B through the mounting hole 14 provided in the central portion of the cutting tool body 10Y, and the cutting tool body 10 is attached to the bolt head of the mounting bolt 1. The cutting tool main body 10Y is attached to the tip portion of the arbor 20 so as to be sandwiched between 1a and the tip surface 21 of the arbor 20A.

In this way, when the cutting tool body 10Y having a small recess diameter Dy of the mounting recess 12 is attached to the mounting stepped portion 22y having a small diameter dy on the distal end side protruding from the distal end surface 21 of the arbor 20, the distal end surface of the arbor 20 21 and the mounting surface 11 of the cutting tool main body 10Y, the cutting tool main body 10Y having a small recess diameter Dy of the mounting recess 12 is mounted on the tip of the arbor 20. It becomes possible to easily and surely attach it without bumping.

Reference Signs List 1: Mounting bolt 1a: Bolt head 10, 10X, 10Y: Cutting tool body 11: Mounting surface 12: Mounting recess 12a, 12b: Fitting stepped portion 13, 13x, 13y: Key groove 14: Mounting hole 15: Cutting insert 20, 20A, 20B, 20C: arbor 21: tip surface 22, 22a, 22b: mounting projections 22x, 22y: mounting steps 23, 23a, 23b: key portion 24: screw hole 30: adjustment ring 31: through hole 32: adjustment Keyway 33 : Adjustment key portions Da, Db : Recess diameters of fitting step portion Dx, Dy : Recess diameters of mounting recess d, da, db : Diameter of mounting protrusion dx, dy : Diameter of mounting step

Claims (6)

A rotary cutting tool in which the cutting tool body is attached to the tip of the arbor by fitting the mounting projection projecting from the tip surface of the rotating arbor into the mounting recess formed in the arbor-side mounting surface of the cutting tool body. In the above, a plurality of fitting stepped portions having different recess diameters are provided in the mounting recess of the cutting tool body into which the mounting projection projecting from the tip end surface of the arbor is fitted, and the recess diameter of the fitting stepped portion on the arbor side is equal to that of the tip end side. A rotary cutting tool, characterized in that the diameter of the concave portion of the fitting stepped portion is larger than that of the concave portion. In the rotary cutting tool according to claim 1, the mounting convex portion projecting from the tip surface of the arbor is fitted into the fitting stepped portion having a small diameter of the concave portion on the tip side of the mounting concave portion of the cutting tool body, and the tip surface of the arbor is fitted. is brought into contact with the mounting surface on the arbor side of the cutting tool body, and the key portion provided so as to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is cut on the outer peripheral side of the mounting concave portion. A rotary cutting tool characterized by being engaged with a key groove provided on a mounting surface of a tool body. In the rotary cutting tool according to claim 1, when fitting the mounting projection projecting from the tip surface of the arbor to the fitting stepped portion having a large recess diameter on the arbor side of the mounting recess of the cutting tool body, the tip surface of the arbor and the mounting surface of the cutting tool body, and the key portion provided so as to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is attached to the arbor side of the adjusting ring and the key groove provided on the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess. A rotary cutting tool characterized by engaging an adjusting key portion. A rotary cutting tool in which the cutting tool body is attached to the tip of the arbor by fitting the mounting projection projecting from the tip surface of the rotating arbor into the mounting recess formed in the arbor-side mounting surface of the cutting tool body. wherein a plurality of mounting stepped portions with different diameters are provided on the mounting convex portion projecting from the tip end face of the arbor, and the diameter of the mounting stepped portion on the tip end face side of the arbor is larger than the diameter of the mounting stepped portion on the cutting tool main body side. A rotary cutting tool characterized by: In the rotary cutting tool according to claim 4, the attachment step portion having a large diameter on the tip surface side of the attachment projection projecting from the tip surface of the arbor is fitted into the attachment recess of the cutting tool body, and the tip surface of the arbor is fitted. is brought into contact with the mounting surface on the arbor side of the cutting tool body, and the key portion provided so as to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is cut on the outer peripheral side of the mounting concave portion. A rotary cutting tool characterized by being engaged with a key groove provided on a mounting surface of a tool body. In the rotary cutting tool according to claim 4, when fitting the small-diameter mounting stepped portion on the side of the cutting tool body in the mounting convex portion protruding from the tip surface of the arbor into the mounting recessed portion of the cutting tool body, the tip of the arbor is An adjustment ring is sandwiched between the surface and the mounting surface of the cutting tool body, and the key portion provided so as to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is attached to the arbor of the adjustment ring. and the key groove provided on the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess. A rotary cutting tool, characterized in that it engages an adjusting key portion.

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