JP7369164B2 - rotary cutting tool - Google Patents

Description

The present invention relates to a rotary cutting tool in which a cutting tool body is 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 protrusion protruding from the tip of the arbor into the mounting recess formed in the arbor-side mounting surface of the cutting tool body. In this method, a plurality of arbors having different diameters of the mounting protrusions protruding from the tip surface of the arbor can be fitted and attached to the mounting recess in one cutting tool body, and the mounting surface on the arbor side of the cutting tool body can be fitted with a plurality of arbors having different diameters. The cutting tool body is characterized in that the cutting tool bodies having different diameters of the mounting recesses can be fitted and mounted on the mounting protrusion protruding from the distal end surface of one arbor.

Conventionally, rotary cutting tools have been used in which a cutting tool body is attached to the tip of a rotating arbor.

In such a rotary cutting tool, as shown in Patent Documents 1 and 2, a mounting protrusion protruding from the tip surface of the arbor is recessed in the mounting surface on the arbor side of the cutting tool body. Fitted into the mounting recess, the key portion protruding from the distal end surface of the arbor on the outer peripheral side of the mounting convex portion 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. At the same time, the cutting tool body is attached to the arbor by screwing the mounting bolt from the tip side of the cutting tool body through the mounting hole that passes through the cutting tool body and into the threaded hole provided in the arbor. It is shown.

Here, in such a rotary cutting tool, the diameter of the mounting protrusion protruding from the tip surface of the arbor and the recess diameter of the mounting recess formed in the arbor side mounting surface of the cutting tool body are generally as follows. It is standardized based on the size of the arbor and cutting tool body, etc., and the diameter of the mounting convex part on the arbor is different from the diameter of the mounting recess on the cutting tool body. It was difficult to fit the mounting protrusion into the mounting recess in the cutting tool body and attach the cutting tool body to the arbor.

For this reason, it is necessary to prepare and combine a large number of arbors and cutting tool bodies that match the specifications, which raises the cost of manufacturing them and makes it troublesome to store and manage them. .

In addition, in the past, in order to change the diameter of the mounting protrusion protruding from the tip surface of the arbor, a plunge conversion adapter (manyo An FMP plunge conversion adapter (manufactured by Tool Co., Ltd.) is shown 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 part of the arbor increases, and when cutting using this rotary cutting tool, chatter etc. may occur during cutting. This caused problems such as the inability to perform stable cutting.

In addition, conventionally, a ring-shaped conversion sleeve used in a commercially available face mill arbor (manufactured by Manyo Tool Co., Ltd.: FM Face Mill Arbor) has been shown. Attach the conversion sleeve to the outer periphery of the mounting protrusion on the arbor's tip surface so that it fits into the key provided on the tip surface of the arbor, and adjust the diameter of the mounting protrusion on the arbor's tip surface by the thickness of the conversion sleeve. What was made to increase is shown.

However, when a conversion sleeve is attached to the outer periphery of the mounting protrusion protruding from the tip of the arbor in this way, the diameter of the mounting protrusion on the tip of the arbor that is fitted into the mounting recess provided on the cutting tool body is changed. This increases the thickness of the sleeve, making it difficult to use when the difference between the diameter of the mounting recess on the cutting tool body and the diameter of the mounting protrusion on the arbor is small. The height differs depending on the standard depending on the diameter of the mounting convex part, but even if a conversion sleeve is used, the width and height of the key part do not change, so it can be used for various cutting tool bodies with different keyways. The problem was that it became difficult to do so.

Japanese Patent Application Publication No. 5-237716 Utility Model Publication No. 63-131316

The present invention provides a method for attaching a cutting tool body to the tip of an arbor by fitting a mounting protrusion protruding from the tip surface of the arbor into a mounting recess formed in a mounting surface on the arbor side of the cutting tool body. The object of the present invention is to solve the above-mentioned problems in a rotary cutting tool.

That is, the present invention provides a rotary cutting tool as described above, in which a plurality of arbors having different diameters of the mounting protrusions protruding from the distal end surface of the arbor can be fitted and mounted in the mounting recess in one cutting tool body. It is also possible to attach cutting tool bodies with different diameters of the mounting recesses formed on the arbor-side mounting surface of the cutting tool body by fitting them into the mounting protrusion 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, the mounting protrusion protruding from the tip surface of the rotating arbor is recessed in the mounting surface on the arbor side of the cutting tool body. In a rotary cutting tool that attaches the cutting tool body to the tip of the arbor by fitting into the mounting recess that has been formed, the diameter of the recess is A plurality of different fitting steps are provided, and the recess diameter of the fitting step on the arbor side is larger than the recess diameter of the fitting step on the tip side , and the mounting convex portion protruding from the tip surface of the arbor is , by fitting into the fitting stepped portion having a smaller diameter recess on the tip side of the mounting recess of the cutting tool main body, so that the end surface of the arbor is brought into contact with the mounting surface on the arbor side of the cutting tool main body, and the outer periphery of the mounting convex portion is fitted. A key portion provided so as to protrude from the tip surface of the arbor on the side is engaged with a key groove provided on the mounting surface of the cutting tool main body on the outer peripheral side of the mounting recess.

In the above-mentioned rotary cutting tool, when the diameter of the mounting protrusion protruding from the distal end surface of the arbor is small and corresponds to the fitting stepped portion having a small diameter recess on the distal end side of the mounting recess of the cutting tool main body, Fit the small-diameter mounting protrusion protruding from the tip surface of the arbor into the small-diameter fitting step on the tip side of the mounting recess of the cutting tool body, and then A key portion is provided on the mounting surface of the cutting tool body on the outer peripheral side of the mounting recess, and the key portion is provided so as to be in contact with 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 by engaging 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 will be reliably fitted into the fitting step with a small diameter on the tip side of the mounting recess of the cutting tool body, and the tip of the arbor The cutting tool body can be easily and reliably attached to the part without shaking.

In addition, the mounting protrusion protruding from the tip surface of the rotating arbor is fitted into the mounting recess formed in the arbor-side mounting surface of the cutting tool body, and the cutting tool body is attached to the tip of the arbor. In the cutting tool, a plurality of fitting steps with different recess diameters are provided in the fitting recess of the cutting tool body into which the fitting protrusion protruding from the tip surface of the arbor is fitted, and the recess diameter of the fitting step on the arbor side is set to the tip. In a rotary cutting tool whose diameter is larger than the recess diameter of the fitting step on the side , the diameter of the mounting protrusion protruding from the tip surface of the arbor is large, and the diameter of the recess on the arbor side in the mounting recess of the cutting tool body is large. In the case of fitting a fitting step, when fitting the large-diameter mounting convex protruding from the tip surface of the arbor to the fitting step, which has a large diameter on the arbor side of the mounting recess of the cutting tool body, The adjustment ring is sandwiched between the tip surface and the mounting surface of the cutting tool body, and the key part provided so as to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is inserted into the adjustment ring. At the same time, the adjustment ring is engaged with the adjustment key groove provided on the end face of the cutting tool body on the outer circumferential side of the mounting recess, and the end face of the adjustment ring on the cutting tool body side The cutting tool body is attached to the tip of the arbor by engaging the provided adjustment key portion.

In this way, even if the diameter of the mounting convex protruding from the tip surface of the arbor is large, the arbor can be reliably fitted into the fitting stepped portion of the mounting recess of the cutting tool body on the arbor side with a large diameter. 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 easily and securely installed without shaking.

In addition, in the second rotary cutting tool according to the present invention, in order to solve the above-mentioned problems, the mounting protrusion protruding from the tip surface of the rotating arbor is attached to the mounting surface on the arbor side of the cutting tool body. In a rotary cutting tool that is fitted into a recessed mounting recess to attach a cutting tool body to the tip of an arbor, a plurality of mounting steps having different diameters are provided on a mounting protrusion protruding from the tip surface of the arbor, The diameter of the mounting step on the tip side of the arbor is made larger than the diameter of the mounting step on the cutting tool body side , and the diameter of the mounting convex portion protruding from the tip surface of the arbor on the tip side Fit the large mounting step into the mounting recess of the cutting tool body so that the tip surface of the arbor comes into contact with the mounting surface on the arbor side of the cutting tool body, and the tip surface of the arbor on the outer peripheral side of the mounting projection. A key portion provided to protrude from the cutting tool body is engaged with a key groove provided in the mounting surface of the cutting tool main body on the outer peripheral side of the mounting recess.

In the 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 diameter of the recess on the tip side of the mounting convex portion protruding from the tip surface of the arbor is compatible with the mounting stepped portion having a large diameter on the tip side. When installing the arbor, fit the large-diameter mounting step on the distal end side of the mounting protrusion protruding from the distal end surface of the arbor into the mounting recess of the cutting tool body, and then attach the distal end surface of the arbor to the arbor of the cutting tool body. At the same time, the key part provided to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex part is brought into contact with the mounting surface of the cutting tool body on the outer peripheral side of the mounting concave part. The cutting tool body is attached to the tip of the arbor by engaging with the provided keyway.

In this way, even if the diameter of the recess on the tip side of the mounting recess of the cutting tool body is large, the mounting step with the large diameter on the tip side of the mounting protrusion protruding from the tip surface of the arbor can be reliably fitted. , the cutting tool body can be easily and reliably attached to the tip of the arbor without shaking.

In addition, the mounting protrusion protruding from the tip surface of the rotating arbor is fitted into the mounting recess formed in the arbor-side mounting surface of the cutting tool body, and the cutting tool body is attached to the tip of the arbor. In a cutting tool, a plurality of mounting steps with different diameters are provided on the mounting convex portion protruding from the tip surface of the arbor, and the diameter of the mounting step on the tip side of the arbor is equal to the diameter of the mounting step on the cutting tool body side. In the rotary cutting tool which is made larger , the diameter of the recess on the tip side of the mounting recess of the cutting tool body is small, and the diameter of the mounting convex portion protruding from the tip surface of the arbor is small on the side of the cutting tool body. 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 The adjustment ring is sandwiched between the adjustment ring and the mounting surface of the tool body, and the key part provided so as to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is inserted into the end surface of the adjustment ring on the arbor side. An adjustment key provided on the end surface of the adjustment ring on the cutting tool body side is engaged with an adjustment key groove provided on the cutting tool body side end face of the adjustment ring, and is engaged with an adjustment key groove provided on the mounting surface of the cutting tool body on the outer peripheral side of the aforementioned mounting recess. The cutting tool body is attached to the tip of the arbor by engaging the parts.

In this way, even if the diameter of the recess on the tip side of the mounting recess of the cutting tool body is small, the mounting step with the smaller diameter on the cutting tool main body side of the mounting protrusion protruding from the tip surface of the arbor will In addition to being securely fitted into the mounting recess of the main body, the adjustment ring is sandwiched between the tip surface of the arbor and the mounting surface of the cutting tool body, so that there is no gap between the tip surface of the arbor and the mounting surface of the cutting tool body. This makes it possible to easily and reliably attach the cutting tool body to the tip of the arbor without wobbling.

In the first rotary cutting tool according to the present invention, the mounting recess of the cutting tool body into which the mounting protrusion protruding from the tip surface of the arbor is fitted is provided with a plurality of fitting steps having different recess diameters, and the arbor side Since the recess diameter of the fitting step is made larger than the recess diameter of the fitting step on the tip side, even when using multiple arbors with different diameters of the mounting protrusions protruding from the tip surface of the arbor, each of these The mounting protrusion protruding from the tip surface of the arbor can now be reliably fitted into the mounting recess of one cutting tool body, and one cutting tool body can be attached to multiple arbors with different diameters of the mounting protrusion. It can be easily attached to the tip of the holder without rattling.

In the second rotary cutting tool according to the present invention, a plurality of mounting steps having different diameters are provided on the mounting convex portion protruding from the tip surface of the arbor, and the diameter of the mounting steps on the tip surface side of the arbor is Since the diameter of the mounting recess on the arbor side of the cutting tool body is larger than the diameter of the mounting step on the tool body side, the diameter of the mounting recess formed in the mounting surface on the arbor side of the cutting tool body is different for each cutting tool body. The mounting protrusion protruding from the tip surface can now be reliably fitted into the mounting recess on each cutting tool body, and multiple cutting tool bodies with different diameters of the mounting recess can be attached to the tip of one arbor. This makes it easy to install 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. 1 shows an arbor used in the rotary cutting tool according to Embodiment 1, in which (A) is a schematic plan view showing an arbor with a small diameter mounting protrusion, and (B) shows an arbor with a large diameter mounting protrusion. FIG. FIG. 2 is a schematic cross-sectional explanatory diagram showing a cutting tool main body used in the rotary cutting tool according to the first embodiment. FIG. 2 is a schematic explanatory diagram showing a state before the cutting tool main body is attached to the tip of the arbor whose attachment convex portion has a small diameter in the rotary cutting tool according to the first embodiment. In the rotary cutting tool according to the first embodiment, the mounting convex portion of the arbor having a small diameter mounting convex portion is fitted into the fitting step portion having a small diameter concave portion on the tip side of the mounting concave portion of the cutting tool main body. It is a schematic explanatory view showing a state where a cutting tool main body is attached to a tip part of an arbor with a small diameter. 1 is a schematic perspective view showing an adjustment ring used in a rotary cutting tool according to Embodiment 1 of the present invention. In the rotary cutting tool according to Embodiment 1, when the cutting tool body is attached to the tip of the arbor whose mounting convex portion has a large diameter, the adjustment ring is arranged between the arbor and the cutting tool body. It is a schematic explanatory diagram. In the rotary cutting tool according to Embodiment 1, a large diameter mounting convex portion protruding from the tip surface of the arbor is protruded through the through hole of the adjustment ring, and this mounting convex portion is recessed in the mounting surface of the cutting tool body. The distal end of the arbor with a large diameter mounting convex part is fitted into the stepped part of the recessed mounting recess that has a large diameter, and the adjustment ring is sandwiched between the distal end surface of the arbor and the mounting surface of the cutting tool body. It is a schematic explanatory view showing a state in which a cutting tool main body is attached to. FIG. 7 is a schematic perspective view showing an arbor for use in a rotary cutting tool according to Embodiment 2 of the present invention, in which two mounting step portions with different diameters are provided on a mounting convex portion protruding from the distal end surface of the arbor. A cutting tool main body used in the rotary cutting tool according to the second embodiment is shown, (A) is a schematic cross-sectional explanatory diagram showing the cutting tool main body with a large diameter of the mounting recess, and (B) is a diagram showing the diameter of the mounting recess. It is a schematic cross-sectional explanatory view showing a cutting tool body with a small size. In the rotary cutting tool according to Embodiment 2, the cutting tool main body having a large diameter mounting recess is before being attached to the tip of an arbor having a mounting protrusion provided with two mounting steps with different diameters. FIG. In the rotary cutting tool according to Embodiment 2, the cutting tool main body having a large recessed diameter of the mounting recess is fitted to the mounting stepped portion of the mounting protrusion having a large diameter, and is attached to the tip of the arbor. It is a schematic explanatory diagram. In the rotary cutting tool according to Embodiment 2, when attaching the cutting tool main body whose mounting recess has a small concave diameter to the tip of an arbor having a mounting protrusion provided with two mounting steps with different diameters, the arbor It is a schematic explanatory view showing the state where the adjustment ring was arranged between and the cutting tool main body. In the rotary cutting tool according to Embodiment 2, the large-diameter mounting step on the mounting protrusion protruding from the distal end surface of the arbor is inserted into the through hole of the adjustment ring, and the small-diameter mounting step is removed from the adjustment ring. The mounting step with a small diameter 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. , is a schematic explanatory view showing a state in which a cutting tool main body having a mounting recess with a small diameter is attached to the tip of an arbor.

Hereinafter, a rotary cutting tool according to an embodiment of the present invention will be specifically described based on the accompanying drawings. Note that the rotary cutting tool in the present invention is not particularly limited to those shown in the embodiments below, and can be implemented with appropriate modifications within the scope of the gist thereof.

[Embodiment 1]
In the rotary cutting tool in Embodiment 1, as shown in FIG. A key portion 23 is projected forward from the side tip surface 21, and a screw hole 24 is provided in the center of the mounting convex portion 22.

In this first embodiment, as shown in FIGS. 2(A) and 2(B), the diameters of the mounting protrusions 22 protruding from the distal end surface 21 of the arbor 20 are different, and the diameters of the mounting protrusions 22a are different. Arbor 20A has a small diameter da and has a key part 23a corresponding to this small diameter da, and arbor 20B has a large diameter db of the mounting convex part 22b and has a key part 23b corresponding to this large diameter db. I try to use

On the other hand, in the cutting tool main body 10 that is attached to the two arbor 20A, 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. The concave diameter Da of the fitting step 12a on the side corresponds to the small diameter da of the mounting convex part 22a in the arbor 20A, and the concave diameter Db of the fitting step 12b on the arbor 20 side corresponds to the small diameter da of the fitting convex part 22b in the arbor 20B. It is made to correspond to the large diameter db.

In addition, in this cutting tool body 10, a key groove 13 is provided on the outer circumferential side of the mounting recess 12 provided in the mounting surface 11 on the arbor 20 side to engage the key portion 23a etc. of the arbor 20A, Further, a mounting hole 14 is provided that penetrates into the mounting recess 12 from the distal end side of the central portion of the cutting tool body 10, and a plurality of cutting inserts 15 can be replaced at required intervals in the circumferential direction of the distal end of the cutting tool body 10. It is installed.

Here, in the rotary cutting tool according to the first embodiment, in order to attach the cutting tool main body 10 to the tip of the arbor 20A where the diameter da of the attaching convex portion 22a is small, as shown in FIG. The mounting convex portion 22a protruding from the distal end surface 21 of the cutting tool body 10 is arranged to face the mounting recess 12 formed in the mounting surface 11 of the cutting tool body 10.

Then, as shown in FIG. 5, the mounting convex portion 22a protruding from the distal end surface 21 of the arbor 20A is inserted into the mounting recess 12 recessed in the mounting surface 11 of the cutting tool body 10. The arbor 20A is fitted into the fitting stepped portion 12a on the distal end side, and the distal end surface 21 of the arbor 20A is brought into contact with the mounting surface 11 of the cutting tool main body 10, and the arbor protrudes forward on the outer peripheral side of the mounting protrusion 22a. The key portion 23a of the cutting tool body 10 is made to engage with the keyway 13 provided on the outer peripheral side of the mounting recess 12 of the cutting tool body 10.

Thereafter, in the above state, the mounting bolt 1 is screwed into the threaded hole 24 provided in the arbor 20A through the mounting hole 14 provided in the center of the cutting tool main body 10, and the cutting tool main body 10 is attached to the bolt head of the mounting bolt 1. The cutting tool body 10 is attached to the tip of the arbor 20 so as to be sandwiched between the cutting tool 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 whose mounting convex portion 22a has a small diameter da without shaking.

On the other hand, in the rotary cutting tool according to the first embodiment, in order to attach the cutting tool main body 10 to the tip of the arbor 20B where the diameter db of the mounting convex portion 22b is large, as shown in FIG. Using an adjustment ring 30 provided with a through hole 31 through which the mounting convex portion 22b of the arbor 20B is inserted, a key portion 23b provided on the distal end surface 21 of the arbor 20B is engaged with the surface of the adjustment ring 30 facing the arbor 20B. While an adjustment keyway 32 is provided to make the adjustment ring 30 fit, a cylindrical adjustment key portion 33 to be engaged with the keyway 13 provided in 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 the first embodiment, in order to attach the cutting tool main body 10 to the tip of the arbor 20B where the diameter db of the attachment convex portion 22b is large, as shown in FIG. The adjustment ring 30 is disposed between the distal end surface 21 of the arbor 20B from which the portion 22b is projected and the mounting surface 11 of the cutting tool body 10 where the mounting recess 12 is formed.

Then, as shown in FIG. 8, the mounting convex portion 22b protruding from the tip surface 21 of the arbor 20B is made to protrude toward the cutting tool main body 10 side through the through hole 31 of the adjustment ring 30, and the arbor 20B is The key portion 23b provided on the tip surface 21 is engaged with the adjustment keyway 32 of the adjustment ring 30, and in this state, the mounting convex portion 22b protruding through the through hole 31 of the adjustment ring 30 is inserted into the cutting tool body 10. The surface of the adjusting ring 30 facing the cutting tool main body 10 is inserted into the mounting recess 12 formed in the mounting surface 11 and fitted into the fitting step 12b of the mounting recess 12 having a large recess diameter Db. The adjustment key part 33 protruding from the cutting tool body 10 is engaged with the keyway 13 provided in the cutting tool body 10, and the adjustment ring 30 is connected to the tip surface 21 of the arbor 20B and the mounting surface 11 of the cutting tool body 10. Make sure to sandwich it between.

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

In this way, when the cutting tool main body 10 is attached to the tip of the arbor 20B where the diameter db of the mounting convex portion 22b is large, the above-mentioned space is formed between the tip surface 21 of the arbor 20B and the mounting surface 11 of the cutting tool main body 10. With the adjustment ring 30 sandwiched, the cutting tool body 10 can be easily and reliably attached to the tip of the arbor 20B where the diameter db of the attachment convex portion 22b is large without rattling.

[Embodiment 2]
In the rotary cutting tool in Embodiment 2, as shown in FIG. 9, the arbor 20 has two mounting steps 22x and 22y with different diameters d on the mounting protrusion 22 protruding from the center of the distal end surface 21. An arbor 20C is used in which the diameter dx of the mounting step 22x on the distal end surface 21 side of the arbor 20 is larger than the diameter dy of the mounting step 22y on the cutting tool main body 10 side. Also, in this arbor 20C, similarly to the arbor 20 of the first embodiment, a key portion 23 is protruded forward from the distal end surface 21 on the outer peripheral side of the mounting convex portion 22, and the key portion 23 is A screw hole 24 is provided in the center of the protrusion 22 .

On the other hand, in this second embodiment, the cutting tool body 10 to be attached to the arbor 20 has a mounting recess 12 recessed in the mounting surface 11 on the arbor 20 side, as shown in FIGS. Two types of cutting tool main bodies 10X and 10Y with different recess diameters Dx and Dy are used, and the recess diameter Dx of the mounting recess 12 in the cutting tool main body 10X is made larger than the recess diameter Dy of the mounting recess 12 in the cutting tool main body 10Y. The recess diameter Dx of the mounting recess 12 in the cutting tool main body 10X is made to correspond to the diameter dx of the mounting step 22x on the distal end surface 21 side of the arbor 20, while the recess diameter Dy of the mounting recess 12 in the cutting tool main body 10Y is is made to correspond to the diameter dy of the mounting step portion 22y of the arbor 20 on the cutting tool main body 10 side.

Further, in the cutting tool bodies 10X and 10Y, a key groove 13x that engages the key portion 23, etc. of the arbor 20 with the outer peripheral side portion of the mounting recess 12 provided in the mounting surface 11 on the arbor 20 side; 13y, and a plurality of mounting holes 14 penetrating into the mounting recess 12 from the distal end side of the central part of the cutting tool bodies 10X, 10Y are provided, and a plurality of mounting holes 14 are provided at required intervals in the circumferential direction of the distal ends of the cutting tool bodies 10X, 10Y. A cutting insert 15 is attached replaceably.

Here, in the rotary cutting tool according to the second embodiment, when attaching the cutting tool main body 10X having the large recess diameter Dx of the attachment recess 12 to the tip of the arbor 20, as shown in FIG. The mounting convex portion 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 main body 10X.

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

Thereafter, in the above 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 center of the cutting tool main body 10X, and the cutting tool main body 10X is attached to the bolt head of the mounting bolt 1. The cutting tool body 10X is attached to the tip of the arbor 20 so as to be sandwiched between the cutting tool 1a and the tip surface 21 of the arbor 20.

In this way, the mounting step portion 22x having a large diameter dx on the distal end surface 21 side of the mounting convex portion 22 of the arbor 20 is fitted into the mounting recess 12 of the cutting tool body 10X having a large recess diameter Dx. The cutting tool main body 10X, which has a large diameter, can be easily and reliably attached to the tip of the arbor 20A without shaking.

On the other hand, in the rotary cutting tool according to the second embodiment, when attaching the cutting tool main body 10Y in which the recess diameter Dy of the mounting recess 12 is small to the tip of the arbor 20, the steps shown in FIG. Similarly to the adjustment ring 30, a through hole 31 into which the mounting step 22x with a large diameter dx in the mounting convex portion 22 protruding from the distal end surface 21 of the arbor 20 is inserted, and into which the mounting step 22y with a large diameter dy is inserted is located in the center. An adjustment ring 30 provided in the section is provided, and an adjustment key groove 32 is provided on the surface of the adjustment ring 30 facing the arbor 20 to engage the key section 23 provided in the distal end surface 21 of the arbor 20. The adjustment ring 30 is provided with a cylindrical adjustment key portion 33 on the surface facing the cutting tool body 10Y to be engaged with a key groove 13y provided in the cutting tool body 10Y.

In the rotary cutting tool according to the second embodiment, as shown in FIG. The adjustment ring 30 is placed between the surface 11 and the surface 11.

Next, as shown in FIG. 14, the mounting step 22x of the mounting projection 22 protruding from the distal end surface 21 of the arbor 20 is inserted into the through hole 31 of the adjustment ring 30, and the mounting step 22x of the mounting projection 22 is inserted into the through hole 31 of the adjustment ring 30. The mounting step portion 22y is made to protrude 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 keyway 32 of the adjustment ring 30. In this state, the adjustment ring 30 is The mounting step 22y protruding through the through hole 31 is fitted into the mounting recess 12 with a recess diameter Dy formed in the mounting surface 11 of the cutting tool main body 10Y, and the adjustment ring 30 is connected to the cutting tool main body 10Y side. The adjustment key part 33 protruded from the cutting tool main body 10Y is engaged with the keyway 13y provided in the cutting tool main body 10Y, and the adjustment ring 30 is connected to the tip surface 21 of the arbor 20 and the mounting surface 11 of the cutting tool main body 10Y. Make sure to sandwich it between.

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

In this way, when the cutting tool main body 10Y of the mounting recess 12 having a small diameter Dy is attached to the mounting step 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, and the cutting tool main body 10Y with the small recess diameter Dy of the mounting recess 12 is placed on the tip of the arbor 20. It can be easily and reliably installed without becoming sagging.

1: Mounting bolt 1a: Bolt head 10, 10X, 10Y: Cutting tool body 11: Mounting surface 12: Mounting recess 12a, 12b: Fitting step 13, 13x, 13y: Keyway 14: Mounting hole 15: Cutting insert 20, 20A, 20B, 20C: Arbor 21: Tip surface 22, 22a, 22b: Mounting convex portion 22x, 22y: Mounting step portion 23, 23a, 23b: Key portion 24: Screw hole 30: Adjustment ring 31: Through hole 32: Adjustment Keyway 33: Adjustment key portion Da, Db: Recess diameter Dx, Dy of fitting step: Recess diameter d, da, db of mounting recess: Diameter of mounting convex portion dx, dy: Diameter of mounting step

Claims (4)

A rotary cutting tool in which the cutting tool body is attached to the tip of the arbor by fitting a mounting protrusion protruding from the tip surface of the rotating arbor into a mounting recess formed in the arbor-side mounting surface of the cutting tool body. In this method, a plurality of fitting steps with different recess diameters are provided in the mounting recess of the cutting tool body into which the mounting protrusion protruding from the tip surface of the arbor is fitted, and the recess diameter of the fitting step on the arbor side is set to the same as that of the tip side. The diameter of the fitting step is larger than the recess diameter of the fitting step, and the fitting projection protruding from the distal end surface of the arbor is fitted into the fitting step having a smaller diameter on the tip side of the fitting recess of the cutting tool body. The distal end surface of the cutting tool body is brought into contact with the arbor-side mounting surface of the cutting tool body, and the key portion provided so as to protrude from the distal end surface of the arbor on the outer peripheral side of the mounting convex portion is brought into contact with the outer periphery of the mounting recess. A rotary cutting tool that is engaged with a keyway provided on a mounting surface of a cutting tool main body on the side . A rotary cutting tool in which the cutting tool body is attached to the tip of the arbor by fitting a mounting protrusion protruding from the tip surface of the rotating arbor into a mounting recess formed in the arbor-side mounting surface of the cutting tool body. In this method, a plurality of fitting steps with different recess diameters are provided in the mounting recess of the cutting tool body into which the mounting protrusion protruding from the tip surface of the arbor is fitted, and the recess diameter of the fitting step on the arbor side is set to the same as that of the tip side. The diameter of the fitting step is larger than the recess diameter of the fitting step, and when fitting the fitting convex protruding from the tip surface of the arbor into the fitting step having a large recess diameter on the arbor side in the fitting recess of the cutting tool body, the arbor The adjustment ring is sandwiched between the tip surface of the arbor and the mounting surface of the cutting tool body, and the key part provided so as to protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is inserted into the adjustment ring. At the same time, the adjustment ring is engaged with the adjustment keyway provided on the arbor-side end surface of the adjustment ring, and the adjustment ring is engaged with the adjustment keyway provided on the attachment surface of the cutting tool body on the outer peripheral side of the attachment recess. A rotary cutting tool characterized by engaging an adjustment key portion provided in the rotary cutting tool. A rotary cutting tool in which the cutting tool body is attached to the tip of the arbor by fitting a mounting protrusion protruding from the tip surface of the rotating arbor into a mounting recess formed in the arbor-side mounting surface of the cutting tool body. In this case, a plurality of mounting steps having different diameters are provided on the mounting convex portion protruding from the tip surface of the arbor, and the diameter of the mounting step on the side of the tip surface of the arbor is larger than the diameter of the mounting step on the cutting tool body side. Then, fit the large-diameter mounting step on the distal end side of the mounting protrusion protruding from the distal end surface of the arbor into the mounting recess of the cutting tool body, so that the distal end surface of the arbor is aligned with the cutting tool body. The key portion, which is provided so as to be in contact with the mounting surface on the arbor side and protrude from the tip surface of the arbor on the outer peripheral side of the mounting convex portion, is connected to the mounting surface of the cutting tool body on the outer peripheral side of the mounting concave portion. A rotary cutting tool that is engaged with a keyway provided in the rotary cutting tool. A rotary cutting tool in which the cutting tool body is attached to the tip of the arbor by fitting a mounting protrusion protruding from the tip surface of the rotating arbor into a mounting recess formed in the arbor-side mounting surface of the cutting tool body. In this case, a plurality of mounting steps having different diameters are provided on the mounting convex portion protruding from the tip surface of the arbor, and the diameter of the mounting step on the side of the tip surface of the arbor is larger than the diameter of the mounting step on the cutting tool body side. When fitting the smaller 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 are fitted. An adjustment ring is sandwiched between the adjustment ring and the mounting surface of the adjustment ring, and a key portion protruding from the tip surface of the arbor on the outer peripheral side of the mounting convex portion is provided on the arbor side end surface of the adjustment ring. At the same time, the adjustment key portion provided on the end surface of the adjustment ring on the cutting tool body side is engaged with the adjustment 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.

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