JPH10180525A - Mounting mechanism for pin mirror cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting work in a work machine, perform centering accurately surely, also improve mounting rigidity, in a mounting mechanism for a pin mirror cutter. SOLUTION: In a mounting mechanism for a pin mirror cutter removably mounting a cutter main unit 22 circular annularly shaped to arranged a cutting edge in an internal peripheral part in a cutter mounting part 23 driven to rotate in a work machine, a peripheral part of the cutter main unit 22 is mounted in a fitting condition in an internal peripheral part of a cutter mounting part, a peripheral surface of the cutter main unit 22 and an internal peripheral surface of the cutter mounting part are mutually opposed and brought into surface contact, also formed in a slope gradually diametrically contracting toward the insert direction of the cutter main unit 22 relating to the cutter mounting part, in an internal peripheral surface of the cutter main unit 22, a first tooth 24b arranged with an equal space in a circumferential direction is provided, the cutter mounting part, in its peripheral surface, is provided with a second tooth 25b arranged with an equal space in the circumferential direction to be capable of meshing with the first tooth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin mirror cutter for processing a crankshaft of a reciprocating internal combustion engine, and more particularly to a pin mirror cutter having a cutter body attached to a cutter mounting portion provided on a processing machine. The present invention relates to a pin mirror cutter mounting mechanism for attaching and detaching.

[0002]

2. Description of the Related Art Conventionally, as a tool for machining a crankshaft of a reciprocating internal combustion engine, for example, there is a pin mirror cutter as shown in FIG. The pin mirror cutter 1 can be detachably attached to the inner peripheral portion of an annular cutter body 2 with bolts 5 in a state where a plurality of chips 3 project respective cutting edges 4 from the inner peripheral surface of the cutter body 2. Installed.

The pin mirror cutter 1 is shown in FIG.
As shown in FIG. 2, the cutter is attached to a cutter mounting portion 7 provided in the processing machine 6 so that its axis coincides with a main shaft (not shown). Further, chucks 9 and 10 provided in the processing machine 6 are provided.
A crankshaft (not shown) as a work material is bridged through the inner space of the pin mirror cutter 1.

At the time of driving, the pin mirror cutter 1
Is rotated around its own axis by a main shaft in a fixed direction (the direction of arrow A in FIG. 4). In addition, the pin mirror cutter 1 revolves while rotating and is appropriately moved in the axial direction with respect to the fixedly held crankshaft, so that the crankshaft is processed into a predetermined shape by the cutting edge 4 of the pin mirror cutter 1. It has become so.

[0005] By the way, such a pin mirror cutter 1
In the method of processing a crankshaft using the method, the coaxiality between the axis of the pin mirror cutter 1 and the rotation axis of the main shaft of the processing machine greatly affects the processing accuracy. Therefore, as shown in FIGS. 4 and 6, an annular step portion 11 coaxial with the main shaft is formed on the inner peripheral portion of the cutter mounting portion 7 of the processing machine 6, and the outer peripheral portion of the cutter body 2 of the pin mirror cutter 1. To form an annular flange 12 and fit these together,
The recessed portion 13 is formed on the wall surface 11a facing the radial center of the step portion 11.
Are formed, and four key members 14 (one is omitted in the figure) protruding from the wall surface 11a are fitted and arranged.

The key members 14 have a substantially rectangular parallelepiped shape, and are arranged in a cross direction at intervals of 90 ° in plan view of the pin mirror cutter 1 in FIG.
Are fitted into the precisely positioned recessed portions 13 such that the center line m in the width direction intersects with the center P (axial line) in the radial direction, and is fixed with bolts 15.

A key groove 17 (see FIGS. 4 and 7) having the same width as the key member 14 and having a rectangular cross section is formed on the outer peripheral portion of the cutter body 2 in the same arrangement as the key member 14. By fitting the key groove 17 into the cutter body 1, the cutter body 1
Is constrained to increase the coaxiality.

When the cutter main body 2 is mounted on the cutter mounting portion 7, the flange 12 of the cutter main body 2 is fitted into the step portion 11 of the cutter mounting portion 7, and the four key grooves 17 are formed on the key member 14. By fitting each,
The cutter body 2 is mounted on the cutter mounting portion 7 so that the axis of the cutter body 2 matches the axis of the step portion 11. The flange 12 and the step 11 of the cutter body 2 have substantially semi-lunar concave portions 18a and 18
b (which constitutes a circular concave portion 18 as a whole) are formed, and a clamper 19 having a substantially half-moon-shaped notch is rotatably attached to the circular concave portion 18. By rotating the clamper 19 over the concave portion 18a of the flange 12, the cutter body 2 is firmly fixed to the cutter mounting portion 7, and the mounting of the pin mirror cutter 1 to the processing machine 6 is completed.

[0009]

However, if the axis of the cutter body 2 and the axis of the cutter mounting portion 7 are not aligned with each other and are mounted in a shifted state, the workpiece can be precisely machined into a perfect circle. Since the cutter body 2 is lost, it is necessary to accurately center the cutter body 2. However, in the mounting mechanism of the pin mirror cutter 1 having the above-described structure, in consideration of the easiness in the mounting operation of the cutter body 2, a fixed distance is provided between the flange 12 of the cutter body 2 and the step portion 11 of the cutter mounting portion 7. Since the clearance is provided, it is difficult to mount the cutter main body 2 and the cutter mounting portion 7 with their axes aligned accurately, and the centering work is troublesome. As shown in FIG. 6, the cutter main body 2 is combined at the annular step portion 11 on the inner peripheral portion of the cutter mounting portion 7. However, the total thickness of the cutter main body 2 and the cutter mounting portion 7 is divided in half and combined. Therefore, the mounting rigidity is low, so-called chatter may occur during cutting, or cutting may not be possible. Furthermore, since the rotational torque during cutting is transmitted by the four key members 14 and the centering is also performed by these key members 14, the core of the cutter body 2 is displaced due to wear of the key members 14 or the like. There was a fear.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a pin mirror cutter which facilitates the work of mounting the pin mirror cutter on a processing machine, enables accurate and reliable centering, and improves the mounting rigidity. It is an object to provide an attachment mechanism.

[0011]

The present invention has the following features to attain the object mentioned above. That is, in the pin mirror cutter mounting mechanism according to the first aspect, the cutter body having an annular shape and having the cutting blades arranged on the inner peripheral portion is detachably mounted on the cutter mounting portion that is driven to rotate by the processing machine. In the pin mirror cutter mounting mechanism connected so as to rotate integrally, the cutter main body is mounted by inserting an outer peripheral portion thereof into an inner peripheral portion of the cutter mounting portion in a fitted state, and the outer periphery of the cutter main body. A surface and an inner peripheral surface of the cutter mounting portion are inclined surfaces that face each other and come into contact with each other and that gradually decrease in diameter in a direction in which the cutter main body is inserted into the cutter mounting portion. The cutter mounting portion is provided with second teeth which are arranged on the outer peripheral surface thereof at equal intervals in the circumferential direction and are capable of meshing with the first teeth. Technology provided It is adopted.

In this pin mirror cutter mounting mechanism,
The outer peripheral surface formed on the outer peripheral portion of the cutter main body and the inner peripheral surface formed on the inner peripheral portion of the cutter mounting portion face each other and come into surface contact with each other, and gradually in the insertion direction of the cutter main body with respect to the cutter mounting portion. Because it is a slope that reduces the diameter,
When the outer peripheral portion of the cutter body is inserted and fitted into the inner peripheral portion of the cutter mounting portion, the outer peripheral surface of the cutter body comes into contact with the inner peripheral surface of the cutter mounting portion, and the outer peripheral surface extends along the inner peripheral surface. Are guided and fitted. At this time, the inner peripheral surface and the outer peripheral surface come into surface contact over the entire circumference and are positioned, and the axes of the cutter body and the cutter mounting portion are aligned and aligned. Further, since the cutter body and the cutter mounting portion are combined on the entire inclined surfaces of the outer peripheral surface of the cutter body and the outer peripheral surface of the cutter mounting portion, high mounting rigidity is obtained. Furthermore, since the first teeth and the second teeth arranged at equal intervals in the circumferential direction are engaged with each other and attached, the side surface of the first teeth of the cutter body and the side surface of the second teeth of the cutter mounting portion are aligned in the circumferential direction. By making surface contact at a plurality of locations, the rotational torque during cutting is reliably transmitted. That is, the first teeth of the cutter body and the second teeth of the cutter mounting portion also function as a plurality of keys.

According to a second aspect of the present invention, there is provided a pin mirror cutter mounting mechanism according to the first aspect, wherein the first teeth and the second teeth have a trapezoidal shape. Adopted.

In this pin mirror cutter mounting mechanism,
Since the first tooth and the second tooth are formed in a trapezoidal shape, the respective side surfaces of the teeth abut against each other in an inclined state.
A so-called wedge effect is generated, and a large clamping force is generated, and the transmission of rotational torque is improved.

In the pin mirror cutter mounting mechanism according to a third aspect, in the pin mirror cutter mounting mechanism according to the first or second aspect, the first teeth and the second teeth cover the entire circumference in the circumferential direction. Is adopted.

In this pin mirror cutter mounting mechanism,
Since the first teeth and the second teeth are formed over the entire circumference in the circumferential direction, the first teeth and the second teeth are engaged with each other over the entire circumference, so that a more accurate result is obtained. Alignment and high transmission of rotational torque are obtained.

According to a fourth aspect of the present invention, in the pin mirror cutter mounting mechanism according to any one of the first to third aspects, an outer peripheral surface of the cutter body and an inner peripheral surface of the cutter mounting portion are provided. The technology in which the inclination angle of the cutter mounting portion with respect to the axial direction is set in the range of 7 ° to 60 ° is adopted.

In this pin mirror cutter mounting mechanism,
If the inclination angle between the outer peripheral surface of the cutter main body and the inner peripheral surface of the cutter mounting portion is less than 7 °, there is a disadvantage that the supporting force for locking the cutter main body in the axial direction at the time of machining is reduced. When the angle exceeds ゜, the inclination angle is increased from 7 ° to 60 in consideration of the disadvantage that the width of the outer peripheral surface and the inner peripheral surface is widened, the sliding range is enlarged, and the positioning accuracy is reduced. By setting the range of ゜, sufficient supporting force for locking the cutter body and more precise centering are secured.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3. The same reference numerals are used for the same parts or members as those in the above-mentioned prior art. Description is omitted. In these figures, reference numeral 21 denotes a pin mirror cutter, 22 denotes a cutter body, 23 denotes a cutter mounting portion, 24 denotes a flange, and 25 denotes an annular tapered portion.

In FIGS. 1 and 2, the cutter body 22 of the pin mirror cutter 21 and the cutter mounting portion 23 are formed on an annular flange 24 formed on the outer peripheral portion of the cutter body 22 and on the inner peripheral portion of the cutter mounting portion 23. An annular tapered portion 25 coaxial with the main shaft of the processing machine 6 is fitted to and fitted to each other.

As shown in FIG. 2, the outer peripheral surface 24 a of the flange 24 and the inner peripheral surface 25 a of the annular tapered portion 25 face each other and are in surface contact with each other, and the insertion direction of the cutter body 22 into the cutter mounting portion 23. (Arrow B in the figure). Further, on the outer peripheral surface 24a of the flange 24, the cutter-side teeth (first teeth) 2 for coupling are provided over the entire circumference in the circumferential direction.
4b are arranged at equal intervals at 16 locations and are arranged radially with respect to the axis, and as shown in FIG. 3, each cutter-side tooth 24b protrudes in a trapezoidal shape.

Further, the inner peripheral surface 2 of the annular tapered portion 25
5a has a trapezoidally raised mounting portion side tooth (second tooth) 25b that meshes with the cutter side tooth 24b.
16 are arranged at equal intervals in the circumferential direction over the entire circumference at the same intervals as those described above, and are arranged radially with respect to the central axis. That is, with respect to the cutter-side teeth 24b and the mounting-part-side teeth 25b, the two teeth form a so-called Hearth coupling because the other tooth row fits into a valley between two adjacent teeth of one tooth row. Configure.

The outer peripheral surface 24a of the flange 24 and the inner peripheral surface 25a of the annular tapered portion 25 have an inclination angle θ of 7 ° to 60 ° with respect to the axial direction of the cutter mounting portion 23. ing. The cutter side teeth 2
The upper surface of each 4b (ie, eight places) is a clamp portion 24c, and the cutter body 22 is fixed by bringing a clamper of a cutter mounting portion 23 (not shown) into contact with the clamp portions 24c.

In this embodiment, the same key groove and key member as in the conventional example are not provided, and the cutter side teeth 24b and the mounting portion side teeth 25b are engaged with each other to transmit torque during rotation. It has a function to do.

In the mounting mechanism of the pin mirror cutter 21, the outer peripheral surface 24a formed on the flange 24 of the cutter body 22 and the inner peripheral surface 25a formed on the annular tapered portion 25 of the cutter mounting portion 23 face each other. The flange 24 of the cutter body 22 is inserted into the annular tapered portion 25 of the cutter attachment portion 23 because the inclined surface gradually decreases in the direction of insertion of the cutter body 22 into the cutter attachment portion 23. At the time of fitting, the outer peripheral surface 24a of the cutter body 22 comes into contact with the inner peripheral surface 25a of the cutter mounting portion 23, and the outer peripheral surface 24a is guided and fitted along the inner peripheral surface 25a. At this time, since the inner peripheral surface 25a and the outer peripheral surface 24a are formed as conical surfaces having axes coinciding with the axes of the cutter mounting portion 23 and the cutter body 22, respectively, they come into surface contact over the entire circumference. , And the axes of the cutter body 22 and the cutter mounting portion 23 are aligned and aligned.

The cutter body 22 and the cutter mounting portion 23
Means the outer peripheral surface 24a of the cutter body 22 and the cutter mounting portion 2
3 is combined with the outer peripheral surface 25a on the entire inclined surface, so that high mounting rigidity is obtained.

Further, since the cutter-side teeth 24b and the attachment-side teeth 25b arranged at equal intervals in the circumferential direction are engaged with each other and attached, the side surface of the cutter-side teeth 24b of the cutter body 22 and the attachment of the cutter attachment portion 23 are provided. Since the side surfaces of the part side teeth 25b come into surface contact at a plurality of locations in the circumferential direction, the rotational torque during cutting is reliably transmitted. That is, the cutter-side teeth 24b of the cutter body 22 and the attachment-side teeth 25b of the cutter attachment portion 23 also function as a plurality of keys.

Since the cutter-side teeth 24b and the mounting portion-side teeth 25b are formed in a trapezoidal shape, the sides of the teeth abut against each other in an inclined state, so that a so-called wedge effect occurs and a large clamp is formed. A force is generated, and the transmission of rotational torque is improved. Further, since the cutter-side teeth 24b and the mounting portion-side teeth 25b are formed over the entire circumference in the circumferential direction, the cutter-side teeth 24b and the mounting portion-side teeth 25b are engaged with each other over the entire circumference. Because of this, more accurate centering and high transmission of rotational torque can be obtained.

Further, by setting the inclination angle θ between the outer peripheral surface 24a of the cutter body 22 and the inner peripheral surface 25a of the cutter mounting portion 23 in a range of 7 ° to 60 °, the cutter body 22 is locked. Of sufficient support and more precise alignment. That is, when the inclination angle θ is less than 7 °, if the inclination angle is small, it is difficult to attach and detach the cutter (the cutter cannot be detached).
゜, the outer peripheral surface 24a and the inner peripheral surface 25a
This is because there is an inconvenience that the width is widened, the sliding range is enlarged, and the positioning accuracy is reduced.

As described above, according to the present embodiment, the centering of the cutter main body 22 and the cutter mounting portion 23 can be performed accurately and reliably, and the rotational torque of the cutter mounting portion 23 can be reliably and strongly reduced. Can be transmitted to

In the above-described embodiments, the entire outer peripheral surface 24a and inner peripheral surface 25a of the cutter body 22 and the cutter mounting portion 23 are formed as the inclined surfaces having the inclination angle θ. 22 may be partially formed in the insertion direction. For example, on the outer peripheral surface of the cutter body and the inner peripheral surface of the cutter mounting portion, only the upper surface may be an inclined surface, and the lower surface may be a vertical surface along an axis.
However, in order to improve the mounting rigidity, as described above, it is desirable that the entire outer peripheral surface 24a and the inner peripheral surface 25a be inclined surfaces having the inclination angle θ.

Also, the cutter-side teeth 24b and the attachment-side teeth 25b are formed over the entire circumference in the circumferential direction.
If they are formed at positions where they are engaged with each other, they may be formed at a part in the circumferential direction. However, in order to perform more accurate centering, it is preferable to form over the entire circumference. In the case where each tooth is formed in a part of the circumferential direction, the cutter side teeth 24b and the mounting portion side teeth 25b may be arranged at a plurality of positions in the circumferential direction and formed at positions symmetric with respect to the rotation axis. , Since each tooth is arranged evenly radially with respect to the central axis,
The centering accuracy is improved, and the rotation balance can be maintained well.

[0033]

According to the present invention, the following effects can be obtained. (1) According to the pin mirror cutter mounting mechanism of the first aspect, the outer peripheral surface of the cutter main body and the inner peripheral surface of the cutter mounting portion are inclined surfaces whose diameter gradually decreases in the direction of insertion of the cutter main body. Therefore, when the outer peripheral portion of the cutter main body is inserted into and fitted to the inner peripheral portion of the cutter mounting portion, the cutter main body and the cutter mounting portion can be positioned accurately and accurately. Higher installation rigidity because the cutter body and the cutter mounting part are combined with each other on the entire inclined surface of the outer peripheral surface of the cutter body and the outer peripheral surface of the cutter mounting part. Therefore, the occurrence of chatter or the like during cutting can be suppressed, and good cutting can be performed. Furthermore, since the first teeth and the second teeth arranged at equal intervals in the circumferential direction are engaged with each other and attached, the side surface of the first teeth of the cutter body and the side surface of the second teeth of the cutter mounting portion are aligned in the circumferential direction. By making surface contact at a plurality of locations, it is possible to reliably transmit rotational torque during cutting. That is, since the first teeth of the cutter body and the second teeth of the cutter mounting portion function as a plurality of keys having high transmissivity with each other, it is not necessary to separately provide a key member or the like. The misalignment can be prevented, and the number of members can be reduced.

(2) According to the pin mirror cutter mounting mechanism of the second aspect, since the first teeth and the second teeth are formed in a trapezoidal shape, the mutual side surfaces of the teeth are inclined. Because of the contact, a so-called wedge effect is generated, a large clamping force is generated, and the transmission of rotational torque can be improved.

(3) According to the pin mirror cutter mounting mechanism of the third aspect, since the first teeth and the second teeth are formed over the entire circumference in the circumferential direction, the first teeth and the second teeth are formed. Since the second teeth are engaged with each other over the entire circumference, more accurate centering and high transmission of rotational torque can be obtained.

(4) According to the pin mirror cutter mounting mechanism of the fourth aspect, the inclination angle of the outer peripheral surface of the cutter body and the inner peripheral surface of the cutter mounting portion with respect to the axial direction is set in the range of 7 ° to 60 °. By doing so, it is possible to secure a sufficient supporting force and a more precise centering for locking the cutter body during processing.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a pin mirror cutter according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line YY of FIG.

FIG. 3 is a view taken in the direction of the arrow Z in FIG. 2;

FIG. 4 is a plan view of a main part of a conventional pin mirror cutter.

FIG. 5 is a schematic configuration diagram of a processing machine to which a pin mirror cutter is attached.

FIG. 6 is a sectional view taken along line XX of FIG. 4;

FIG. 7 is a side view of a keyway portion of the cutter body.

[Explanation of symbols]

 Reference Signs List 21 Pin mirror cutter 22 Cutter body 23 Cutter mounting part 24 Flange 24a Outer peripheral surface 24b Cutter side teeth (first tooth) 25 Annular taper part 25a Inner peripheral surface 25b Mounting part side teeth (second tooth) θ Tilt angle

Claims (4)

[Claims] A cutter body having an annular shape and having cutting blades arranged on an inner peripheral portion thereof is detachably mounted on a cutter mounting portion of a processing machine that is driven to rotate, and connected to rotate integrally. In the mirror cutter mounting mechanism, the cutter main body is mounted by inserting an outer peripheral portion of the cutter main body into an inner peripheral portion of the cutter mounting portion in a fitted state, and an outer peripheral surface of the cutter main body and an inner peripheral surface of the cutter mounting portion. Are inclined surfaces that come into surface contact with each other and that gradually decrease in diameter in the direction in which the cutter body is inserted into the cutter mounting portion, and the cutter bodies are arranged on the inner peripheral surface thereof at equal intervals in the circumferential direction. A pin mirror, wherein the cutter mounting portion has second teeth that are arranged on the outer peripheral surface thereof at equal intervals in a circumferential direction and are capable of meshing with the first teeth. Cutter mounting mechanism. 2. The pin mirror cutter mounting mechanism according to claim 1, wherein the first teeth and the second teeth have a trapezoidal shape. 3. The pin mirror cutter mounting mechanism according to claim 1, wherein the first teeth and the second teeth are formed over the entire circumference in the circumferential direction. Pin mirror cutter mounting mechanism. 4. The pin mirror cutter mounting mechanism according to claim 1, wherein an outer peripheral surface of the cutter body and an inner peripheral surface of the cutter mounting portion are inclined at an angle with respect to an axial direction of the cutter mounting portion. Is set in the range of 7 ° to 60 °.