JP5492177B2 - Cutting method - Google Patents

Description

The present invention relates to a cutting method for performing a cutting process such as a reamer process.

  As a cutting device for reaming a cylindrical workpiece such as a valve guide, a cutting tool provided with a cutting blade at the front end portion of the shaft portion, a cylindrical fitting member into which the shaft portion is inserted, (For example, refer to Patent Document 1).

  In the above-described cutting apparatus, the front end portion of the cutting blade is worn while the workpiece is repeatedly cut. Therefore, the cutting accuracy of the cutting blade is maintained by appropriately polishing the front end portion of the cutting blade. Therefore, when the forward feed amount of the fitting member is set to be constant, if the cutting blade is shortened, the front portion of the workpiece cannot be cut.

  Accordingly, there is a cutting tool 100 shown in FIG. 10 in which the shaft portion 11 is formed with two front and rear concave grooves 20A and 20B. In this configuration, when the cutting tool 100 is new, the front groove 20A is fitted to the fitting member, and when the cutting blade 12 is shortened, the rear groove 20B is fitted to the fitting member. The cutting blade 12 can be moved forward with respect to the fitting member. Thereby, since the site | part which can use the cutting blade 12 spreads, the frequency | count of use of the cutting tool 100 can be increased.

JP 2009-107086 A

  When the front and rear groove portions 20A and 20B are formed in the shaft portion 11 as in the conventional cutting tool 100 described above, when the rear groove portion 20B is fitted to the fitting member, the operator mistakenly operates. There is a possibility that the groove 20A on the front side is fitted to the fitting member.

This invention makes it a subject to provide the cutting method which can project a shaft part ahead reliably, and can expand the site | part which can use a cutting blade.

In order to solve the above problems, the present invention provides a cutting tool having a shaft portion and a cutting blade provided at a front end portion of the shaft portion, a fitting member having a fitting hole into which the shaft portion is inserted, It is the cutting method using the cutting device provided with the holder which supports a fitting member. On the outer peripheral surface of the shaft portion of the cutting tool, an attachment portion having a plane that matches the plane formed on the inner peripheral surface of the fitting hole is formed . The mounting portion is formed with a first groove portion having a first plane continuous with a rear end surface of the shaft portion, and a phase shifted from one of the shaft portions around the axis of the first groove portion. , a second groove portion concave with the front of the second plane that is continuous with the front portion of the first plane, is provided. And, in a state where the second groove portion is fitted to the fitting member, the workpiece is cut by the cutting blade by rotating the fitting member and the shaft portion around one of the axes. The mounting portion is formed with a phase difference with respect to the rear portion of the second plane and the second groove portion around one axis of the shaft portion, and is continuous with the rear portion of the second plane. The step of forming a concave third groove portion having three planes, and the fitting member and the shaft portion are rotated around one of the axes in a state where the third groove portion is fitted to the fitting member. And cutting the workpiece with the cutting blade. The shaft portion may be provided with the cutting blade for reaming a cylindrical workpiece.

Further, in the prior Symbol the holder may be provided with a resilient member for urging said shaft portion which is inserted through the fitting member forward.

In the present invention, when the cutting tool is attached to the fitting member, first, the shaft portion is inserted into the fitting member from the rear end side, and the front portion of the first plane is matched with the plane of the fitting member. Then, the shaft portion is rotated to the other around the shaft so that the front portion of the second plane matches the plane of the fitting member. In this state, the shaft portion is protruded forward, and the rear portion of the second plane is matched with the plane of the fitting member. Furthermore, the shaft portion is rotated to the other side around the shaft, and the third plane is made to coincide with the plane of the fitting member.
As a result, the third groove portion is engaged with the fitting member, the shaft portion is positioned in the axial direction with respect to the fitting member, and the shaft portion rotates in one of the directions around the shaft in conjunction with the fitting member. It becomes possible.

In the present invention, when the cutting tool is new, the cutting blade is formed in a state in which the front portion of the first groove portion and the second groove portion is formed in the shaft portion and the front portion of the second groove portion is fitted to the flat surface of the fitting member. To cut the workpiece. When the cutting blade is shortened, the rear part and the third groove part of the second groove part are formed in the shaft part, and the shaft part can be projected forward by fitting the third groove part to the flat surface of the fitting member. .
In the present invention, since the second groove portion and the third groove portion are formed out of phase around the axis of the shaft portion, the third groove portion is fitted to the fitting member when the shaft portion is projected forward. This makes it easier for the operator to recognize this.
Therefore, when the cutting blade is shortened, the shaft portion can be reliably projected forward, and the usable portion of the cutting blade can be expanded.

  In addition, when an elastic member that urges the shaft portion inserted through the fitting member forward is provided, when the front portion of the second plane matches the plane of the fitting member, the shaft portion becomes an elastic member. Since it is pushed forward by this restoring force, the shaft portion can be reliably projected forward.

In the cutting method of the present invention, the cutting blade can be reliably moved forward, and the usable part of the cutting blade can be expanded, so that the number of times of use of the cutting blade can be increased.

It is the sectional side view which showed the cutting device of this embodiment. It is the figure which showed the fitting member of this embodiment, (a) is the figure seen from the front, (b) is a sectional side view. It is the perspective view which showed the rear part of the axial part of this embodiment. It is the figure which showed the rear part of the axial part of this embodiment, (a) is a side view, (b) is AA sectional drawing, (c) is BB sectional drawing, (d) is CC sectional drawing. (E) is a DD sectional view. In the cutting tool of this embodiment, it is the figure which showed the state which fitted the front part of the 1st groove part to the fitting member, (a) is a sectional side view, (b) is FF sectional drawing. In the cutting tool of this embodiment, it is the figure which showed the state which fitted the front part of the 2nd groove part to the fitting member, (a) is a sectional side view, (b) is GG sectional drawing. In the cutting tool of this embodiment, it is the figure which showed the state which fitted the rear part of the 2nd groove part to the fitting member, (a) is a sectional side view, (b) is HH sectional drawing. In the cutting tool of this embodiment, it is the figure which showed the state which fitted the 3rd groove part to the fitting member, (a) is a sectional side view, (b) is II sectional drawing. In the cutting tool of this embodiment, it is a comparison figure with a new state and the state which formed the 3rd groove part in the axial part. It is the side view which showed the conventional cutting tool.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the present embodiment, a cutting tool for reaming a valve guide and a valve seat at the same time and a cutting apparatus using the cutting tool are illustrated.

As shown in FIG. 1, the cutting device 1 supports the cutting tool 10 provided with the cutting blade 12 at the front end portion of the shaft portion 11, the fitting member 50 having the fitting hole 52, and the fitting member 50. And the shaft portion 11 of the cutting tool 10 is inserted into the fitting hole 52 of the fitting member 50.
The cutting device 1 rotates the shaft portion 11 and the cutting blade 12 around the axis by rotating the holder 60, and the cutting blade 12 is inserted into the center hole 91 of the workpiece 90 (valve guide and valve seat). The inner circumferential surface of the center hole 91 is cut.

The holder 60 is a member that rotates around an axis by a drive motor (not shown), and a bottomed cylindrical accommodation hole 61 is opened at the center of the front end surface 60a.
An elastic member 71 that expands and contracts in the front-rear direction is accommodated at the bottom of the accommodation hole 61. In the present embodiment, a coil spring is used as the elastic member 71, but the configuration is not limited, and a rubber material or the like may be used.

  In the accommodation hole 61, a receiving member 72 is accommodated in front of the elastic member 71. The receiving member 72 is a member that is slidable in the front-rear direction within the accommodation hole 61, and a truncated cone-shaped concave portion 72b that is reduced in diameter toward the rear is formed at the center of the front end surface 72a.

  As shown in FIGS. 2A and 2B, the fitting member 50 is a cylindrical member, and a flange portion 51 projects from the outer peripheral surface of the front portion. In the flange portion 51, three bolt insertion holes 51a penetrating in the front-rear direction are formed at equal intervals in the circumferential direction.

  A fitting hole 52 penetrates through the center of the fitting member 50 in the front-rear direction. The rear end opening 52b of the fitting hole 52 is formed in a cylindrical shape. In the fitting hole 52, a flat surface 52a and a curved surface continuous with the inner peripheral surface of the rear end opening 52b are formed on the inner peripheral surface in front of the rear end opening 52b. In addition, a bottom surface 52c is formed at a step portion between the rear end opening 52b and the flat surface 52a.

As shown in FIG. 1, the rear portion of the fitting member 50 is fitted into the front end portion of the accommodation hole 61 of the holder 60, and the fitting hole 52 and the accommodation hole 61 are arranged on the same axis.
The rear surface of the flange portion 51 is in contact with the front end surface 60a of the holder 60, and a bolt (not shown) inserted through each bolt insertion hole 51a is screwed into a screw hole (not shown) of the holder 60. Thus, the fitting member 50 is fixed to the holder 60.

As shown in FIG. 1, the cutting tool 10 includes a shaft portion 11 that extends in the front-rear direction and a cutting blade 12 that is provided at a front end portion 11 a of the shaft portion 11.
The cutting blade 12 is a cutting blade for reaming that is inserted into the center hole 91 of the workpiece 90 and rotates in the center hole 91 to cut the inner peripheral surface of the center hole 91.

The shaft portion 11 is a member having a circular cross section, and is inserted into the fitting hole 52 of the fitting member 50 so as to be slidable in the front-rear direction.
A taper-shaped rear end surface 11 b that is reduced in diameter toward the rear is formed at the rear end portion of the shaft portion 11. The rear end surface 11 b is fitted to the inner peripheral surface of the recess 72 b of the receiving member 72 when the rear portion of the shaft portion 11 is inserted into the accommodation hole 61 of the holder 60.

A mounting portion 20 having flat surfaces 21a, 22a, and 23a that match the flat surface 52a of the fitting member 50 is formed on the outer peripheral surface of the rear portion of the shaft portion 11.
As shown in FIG. 3, the mounting portion 20 is formed with a first groove portion 21 and a phase shifted with respect to the first groove portion 21 in one direction around the axis of the shaft portion 11 (D1 direction in FIG. 3). A second groove portion 22 and a third groove portion 23 formed so as to be shifted in phase in one direction around the axis of the shaft portion 11 (D1 direction in FIG. 3) with respect to the second groove portion 22 are formed.

As shown in FIG. 4A, the first groove portion 21 is a groove portion in which a part of the outer peripheral surface of the rear portion of the shaft portion 11 is cut out in an L shape in a side view. The first groove portion 21 is formed with a first flat surface 21a extending in the front-rear direction and a front wall surface 21b raised at the front edge of the first flat surface 21a.
The rear end portion of the first flat surface 21 a is continuous with the rear end surface 11 b of the shaft portion 11, and a part of the rear end surface 11 b is cut away by the first groove portion 21.

As shown in FIG. 3, the second groove portion 22 is a concave groove portion that is formed with a phase shifted with respect to the first groove portion 21 in one direction around the axis of the shaft portion 11 (D1 direction in FIG. 3).
Note that the second groove portion 22 of the present embodiment is formed with a 90 ° phase shift to one of the shaft portions 11 around the axis with respect to the first groove portion 21.

The second groove 22 has a second plane 22a extending in the front-rear direction, a front wall 22b raised at the front edge of the second plane 22a, and raised at the rear edge of the second plane 22a. The rear wall surface 22c is formed.
The front wall surface 22b of the second groove portion 22 and the front wall surface 21b of the first groove portion 21 are disposed at the same position in the front-rear direction, and both the front wall surfaces 22b and 21b are continuous.

As shown in FIG. 6A, the front part 22d and the intermediate part 22e of the second plane 22a are formed in the same size in the front-rear direction as the plane 52a of the fitting member 50.
As shown in FIG. 4B, the front part 22d and the intermediate part 22e of the second plane 22a are arranged at right angles to the first plane 21a. The front portion 22d and the intermediate portion 22e of the second plane 22a and the first plane 21a are continuous via the first curved surface 24a.

As shown in FIG. 3, the third groove portion 23 is a concave groove portion that is formed with a phase shifted in one direction around the axis of the shaft portion 11 (D1 direction in FIG. 3) with respect to the second groove portion 22.
Note that the third groove portion 23 of the present embodiment is formed with a phase difference of 90 degrees on one side of the shaft portion 11 around the axis with respect to the second groove portion 22. Further, the third groove portion 23 is formed so as to be shifted in phase by 180 degrees with respect to the first groove portion 21 on one side around the axis of the shaft portion 11.

The third groove 23 has a third plane 23a extending in the front-rear direction, a front wall 23b raised at the front edge of the third plane 23a, and raised at the rear edge of the third plane 23a. The rear wall surface 23c is formed.
The rear wall surface 23c of the third groove portion 23 and the rear wall surface 22c of the second groove portion 22 are arranged at the same position in the front-rear direction, and both the rear wall surfaces 23c, 22c are continuous.

As shown in FIG. 8A, the third plane 23a is formed in the same size as the plane 52a of the fitting member 50 in the front-rear direction.
As shown in FIGS. 4C and 4D, the third plane 23a is disposed at right angles to the intermediate portion 22e and the rear portion 22f of the second plane 22a. The third plane 23a and the intermediate portion 22e and the rear portion 22f of the second plane 22a are continuous via the second curved surface 24b. The third plane 23a and the first plane 21a are arranged in parallel.

Next, a procedure for attaching the cutting tool 10 to the fitting member 50 will be described.
First, as shown in FIGS. 5A and 5B, the operator adjusts the circumferential direction of the shaft portion 11 so that the first flat surface 21 a matches the flat surface 52 a of the fitting member 50. Then, the shaft portion 11 is inserted into the fitting hole 52 from the rear end side, and the rear end surface 11b is fitted to the inner peripheral surface of the recess 72b as shown in FIG. Further, the rear portion of the shaft portion 11 is pushed into the accommodation hole 61 against the elastic force of the elastic member 71.

  As shown in FIG. 5A, the front wall surface 21 b of the first groove portion 21 abuts on the front end surface 50 a of the fitting member 50 while sliding the first flat surface 21 a with respect to the flat surface 52 a of the fitting member 50. The rear part of the shaft part 11 is pushed into the accommodation hole 61 to the position. Thereby, the front part of the first flat surface 21 a matches the flat surface 52 a of the fitting member 50.

As shown in FIGS. 6 (a) and 6 (b), when the operator rotates the shaft portion 11 by 90 degrees in the other direction (D2 direction in FIG. 6 (a)), the front portion 22d of the second plane 22a. The intermediate portion 22e matches the flat surface 52a of the fitting member 50.
In this state, when the operator loosens the force for holding the shaft portion 11, the shaft portion 11 is applied to the fitting member 50 by the restoring force of the elastic member 71 (see FIG. 1) as shown in FIG. On the other hand, it is pushed forward.

  While sliding the second flat surface 22 a with respect to the flat surface 52 a of the fitting member 50, the rear wall surface 22 c of the second groove portion 22 is moved to a position where it abuts against the bottom surface 52 c of the fitting hole 52. Thereby, the intermediate part 22e and the rear part 22f of the 2nd plane 22a correspond to the plane 52a of the fitting member 50. FIG.

As shown in FIGS. 8A and 8B, when the operator rotates the shaft portion 11 by 90 degrees in the other direction around the axis (D2 direction in FIG. 8A), the third plane 23a is fitted. 50 planes 52a.
As a result, the fitting member 50 is fitted in the third groove 23, the shaft portion 11 is positioned in the front-rear direction with respect to the fitting member 50, and the shaft portion 11 is interlocked with the fitting member 50. It can be rotated around one axis (direction D1 in FIG. 1).

In the cutting apparatus 1 shown in FIG. 1, after the cutting tool 10 is attached to the fitting member 50 by the above procedure, the holder 60 is rotationally driven around one axis (D1 direction in FIG. 1), and the fitting member 50 and The inner peripheral surface of the center hole 91 is cut by the cutting blade 12 by rotating the shaft portion 11 around one axis.
In addition, when removing the cutting tool 10 from the fitting member 50, each above-mentioned procedure is performed reversely.

  In the cutting apparatus 1 as described above, when the cutting tool 10 is new, as shown in the upper side of FIG. 9, the shaft portion 11 has a first groove portion 21 (not shown) and a front portion and an intermediate portion of the second groove portion 22. Only form it. And the inner peripheral surface of the center hole 91 (refer FIG. 1) is cut with the cutting blade 12 (refer FIG. 1) in the state which made the front part and intermediate part of the 2nd groove part 22 fit to the fitting member 50. FIG.

  When the cutting blade 12 is shortened by polishing the front end portion of the cutting blade 12 (see FIG. 1), the cutting tool 10 is once removed from the fitting member 50, and as shown in the lower side of FIG. A rear portion 22f (not shown) of the second groove portion 22 and a third groove portion 23 are formed. Then, the shaft portion 11 protrudes forward with respect to the fitting member 50 by fitting the third groove portion 23 to the fitting member 50.

In the cutting tool 10 of the present embodiment, as shown in FIG. 3, the second groove portion 22 and the third groove portion 23 are formed around the axis of the shaft portion 11 so that the phases thereof are shifted. It is easy for the operator to recognize that the fitting has been performed on the wearing member 50.
Therefore, as shown in FIG. 1, when the cutting blade 12 is shortened, the shaft portion 11 can be reliably protruded forward, and the usable portion of the cutting blade 12 can be widened. The number of times of using 12 can be increased.

  Further, at the stage of attaching the cutting tool 10 to the fitting member 50, the front portion 22d and the intermediate portion 22e of the second plane 22a are made to coincide with the plane 52a of the fitting member 50 as shown in FIG. Sometimes, the shaft portion 11 is pushed forward by the restoring force of the elastic member 71 (see FIG. 1), as shown in FIG. 7A, so that the shaft portion 11 can reliably protrude forward.

  As shown in FIG. 3, the first plane 21a and the second plane 22a are continuous via the first curved face 24a, and the second plane 22a and the third plane 23a are continuous via the second curved face 24b. Therefore, the attachment portion 20 of the shaft portion 11 can be smoothly rotated with respect to the flat surface 52a of the fitting member 50.

The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
For example, in the present embodiment, as shown in FIG. 1, the cutting tool 10 for reaming a cylindrical workpiece 90 (valve guide and valve seat) is illustrated, but the front end portion of the shaft portion 11 is illustrated. Can be provided with various cutting blades.

  In the present embodiment, the rear end surface 11 b of the shaft portion 11 is formed in a tapered shape, but the rear end surface may be a plane perpendicular to the axial direction of the shaft portion 11.

DESCRIPTION OF SYMBOLS 1 Cutting device 10 Cutting tool 11 Shaft part 11b Rear end surface 12 Cutting blade 20 Mounting part 21 First groove part 21a First plane 21b Front wall surface 22 Second groove part 22a Second plane 22b Front wall surface 22c Rear wall surface 22d Front part (Second plane) )
22e Middle part (second plane)
22f Rear (second plane)
23 3rd groove part 23a 3rd plane 23b front wall surface 23c back wall surface 24a 1st curved surface 24b 2nd curved surface 50 fitting member 52 fitting hole 52a plane 52b rear end opening part 52c bottom surface 60 holder 61 accommodation hole 71 elastic member 72 receiving member 90 Workpiece 91 Center hole

Claims (3)

A cutting tool having a shaft portion and a cutting blade provided at a front end portion of the shaft portion ;
A fitting member having a fitting hole into which the shaft portion is inserted;
A cutting method using a cutting device comprising a holder for supporting the fitting member,
On the outer peripheral surface of the shaft portion of the cutting tool, an attachment portion having a plane that matches the plane formed on the inner peripheral surface of the fitting hole is formed ,
In the mounting part,
A first groove portion having a first plane continuous with a rear end surface of the shaft portion;
A concave second groove portion having a front portion of a second plane that is formed with a phase shifted to one of the axes of the shaft portion with respect to the first groove portion and is continuous with the front portion of the first plane; Is provided ,
Cutting the workpiece with the cutting blade by rotating the fitting member and the shaft portion around one of the axes in a state where the second groove portion is fitted to the fitting member;
A third portion that is formed on the mounting portion with a phase shifted to one of the shaft portions with respect to the rear portion of the second plane and the second groove portion and is continuous with the rear portion of the second plane. Forming a concave third groove having a flat surface ;
Cutting the workpiece with the cutting blade by rotating the fitting member and the shaft portion around one of the shafts in a state where the third groove portion is fitted to the fitting member; A cutting method characterized by comprising: The cutting method according to claim 1, wherein the shaft portion is provided with the cutting blade for reaming a cylindrical workpiece. The front Symbol in the holder, the cutting method according to claim 1 or claim 2, characterized in that the elastic member that urges the shaft portion which is inserted through the fitting member to the front is provided.

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