JPH09309019A - Mounting mechanism for pin mirror cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting work so that accurate and sure centering can be performed, by bringing an external peripheral surface of a cutter main unit and an internal peripheral surface of a cutter mounting part mutually into surface contact, also forming a tilt surface gradually contracting a diameter toward an inserting direction of the cutter main unit. SOLUTION: A peripheral surface 24a of a flange 24 and an internal peripheral surface 25a of an annular tapered part 25 are mutually opposed into surface contact, also formed into a tilt surface gradually contracting a diameter toward an inserting direction of a cutter main unit 22 relating to a cutter mounting part 23. In this way, in the case of insertion fitting the flange 24 of the cutter main unit 22 to the annular tapered part 25 of the cutter mounting part 23, the flange is fitted by guiding the peripheral surface 24a of the cutter main unit 22 along the internal peripheral surface 25a. Here, the internal peripheral surface 25a and the peripheral surface 24a have an axial line respectively conformed to an axial line of the cutter mounting part 23 and the cutter main unit 22, so as to make surface contact over a total periphery, also positioned, the axial line is mutually conformed, centering can be performed.

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, a cutter body of the pin mirror cutter is attached to a cutter mounting portion provided on a processing machine. The present invention relates to a mounting mechanism of a pin mirror cutter 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 attached to and detached from a cutter body 2 having an annular shape by a bolt 5 in a state where a plurality of chips 3 have respective cutting edges 4 protruding from the inner peripheral surface of the cutter body 2. It is 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), which is a work material, is bridged over the inner space of the pin mirror cutter 1.

During driving, the pin mirror cutter 1
Is rotated about its own axis by the main shaft in a constant direction (direction of arrow A in FIG. 7). Moreover, the pin mirror cutter 1 revolves around the fixedly held crankshaft while being revolved and appropriately moved in the axial direction, 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.

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. 7 and 9, an annular step portion 11 coaxial with the main shaft is formed on the inner peripheral portion of the cutter attachment portion 7 of the processing machine 6, and the outer peripheral portion of the cutter body 2 of the pin mirror cutter 1 is formed. Forming an annular flange 12 on them, and fitting them together,
The recessed fitting portion 13 is formed on the wall surface 11a facing the center side in the radial direction 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.

These key members 14 are formed in a substantially rectangular parallelepiped shape and are arranged in a cross direction at 90 ° intervals in a 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.

Further, a key groove 17 (see FIG. 7 and FIG. 10) having a rectangular cross section and having the same width as the key member 14 is formed on the outer peripheral portion of the cutter body 2 in the same arrangement as the key member 14. By engaging the key groove 17 with respect to, the radial movement of the cutter body 1 with respect to the stepped portion 11 of the cutter attachment portion 7 is restrained and the coaxiality is increased.

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 attached to the cutter attachment portion 7 so that the axis line of the cutter body 2 matches the axis line 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 (constituting a circular concave portion 18 as a whole) are formed, and a clamper 9 having a substantially half-moon shaped notch is rotatably attached to the circular concave portion 18. By rotating the clamper 9 onto the recess 18a of the flange 12, the cutter body 2 is firmly fixed to the cutter mounting portion 7,
The attachment 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.

In view of the above problems, the present invention provides a pin mirror cutter mounting mechanism that facilitates mounting work of a pin mirror cutter on a processing machine and enables accurate and reliable centering. With the goal.

[0011]

The present invention has the following features to attain the object mentioned above. That is, in the attachment mechanism of the pin mirror cutter according to claim 1, the cutter body which has an annular shape and in which cutting edges are arranged on the inner peripheral portion is detachably attached to the cutter attachment portion for rotationally driving the processing machine. In a mounting mechanism of a pin mirror cutter connected so as to rotate integrally, the cutter body is mounted by inserting the outer peripheral portion into the inner peripheral portion of the cutter mounting portion in a fitted state, and the outer peripheral portion of the cutter body. A technique is adopted in which the surface and the inner peripheral surface of the cutter attachment portion are inclined surfaces that face each other and are in surface contact with each other, and that gradually decrease in diameter in the insertion direction of the cutter body with respect to the cutter attachment portion.

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.

In the mounting mechanism of the pin mirror cutter according to claim 2, the outer peripheral surface of the cutter body and the inner peripheral surface of the cutter mounting portion have an inclination angle of 10 ° to 45 ° with respect to the axial direction of the cutter mounting portion. The technology set in is adopted.

In this pin mirror cutter mounting mechanism,
When the inclination angle between the outer peripheral surface of the cutter body and the inner peripheral surface of the cutter mounting portion is less than 10 °, there is a disadvantage that the supporting force for locking the cutter body in the axial direction during machining is lowered. If the angle exceeds 10 °, the inclination angle is changed from 10 ° to 45 in consideration of the disadvantage that the width of the outer peripheral surface and the inner peripheral surface becomes wider, the sliding range is expanded, and the positioning accuracy is lowered. By setting in the range of °, sufficient support force for locking the cutter body and more precise centering are secured.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described below with reference to FIGS. 1 to 6. The same reference numerals are used for the same parts or members as those in the above-mentioned prior art. The 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 FIG. 1 and FIG. 2, the cutter body 22 and the cutter mounting portion 23 of the pin mirror cutter 21 are formed on the inner peripheral portion of the annular flange 24 and the cutter mounting portion 23 formed on the outer peripheral portion of the cutter body 22. The annular taper portion 25 that is coaxial with the main axis of the processing machine 6 is fitted and attached.

As shown in FIG. 2, the outer peripheral surface 24a of the flange 24 and the inner peripheral surface 25a of the annular taper portion 25 are in face-to-face contact with each other and in the insertion direction of the cutter body 22 into the cutter mounting portion 23. It is an inclined surface whose diameter gradually decreases toward (arrow B in the figure). Further, the outer peripheral surface 24a of the flange 24 and the inner peripheral surface 25a of the annular taper portion 25 are set such that the inclination angle θ of the cutter mounting portion 23 with respect to the axial direction is in the range of 10 ° to 45 °, respectively. The inclination angle θ is set to 15 °.

Further, in this embodiment, the key grooves 34 as shown in FIGS. 3 and 4 are formed on the flange 24 of the cutter body 22 at equal intervals of 90 °. The key groove 34 has a trapezoidal cross section, but is located on the front side in the rotation direction (arrow A in the figure) of the cutter body 22 with respect to the lower and upper openings 34a and 34b having different widths. Has a flat surface 34c orthogonal to the rotation direction, and a side surface on the rear side in the rotation direction is an inclined surface 34d.

On the other hand, in the key member 35 of the cutter mounting portion 23 shown in FIGS. 5 and 6, at least the portion protruding from the inner peripheral surface 25a of the annular taper portion 25 has a trapezoidal cross section, The direction of rotation with respect to the wide bottom surface 35a and the narrow top surface 35b that face each other (see arrow A).
A reference surface 3 whose front side surface is orthogonal to this rotation direction
5d, the inclined side surface 35d located rearward in the rotational direction
Are inclined at the same angle as the inclined surface 34d of the key groove 34. Moreover, the trapezoidal cross section of the key member 35 is formed to have substantially the same size as the trapezoidal cross section of the key groove 34.

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 taper portion 25 of the cutter mounting portion 23 face each other. The surface of the cutter body 22 is in contact with the cutter attachment portion 23 and the diameter of the cutter body 22 is gradually reduced in the insertion direction of the cutter body 22 with respect to the cutter attachment portion 23. When they are fitted together, the outer peripheral surface 24a of the cutter body 22 is brought 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 conical surfaces having axes that match the axes of the cutter attachment portion 23 and the cutter body 22, respectively, they make surface contact over the entire circumference. The cutter body 22 and the cutter mounting portion 23 are aligned with each other and are aligned with each other.

Further, 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 is set to 15 ° so that the cutter body 22 is engaged. It secures sufficient supporting force to stop and more precise centering. That is, the tilt angle θ
When the angle is less than 10 °, the supporting force for locking the cutter body in the axial direction at the time of machining is disadvantageously lowered, and when the angle exceeds 45 °, the outer peripheral surface 24a and the inner peripheral surface 25a are not supported. This is because there is an inconvenience that the width becomes wider, the sliding range expands, and the positioning accuracy decreases.

Further, the cutter body 22 is attached to the cutter mounting portion 2
When the key groove 34 is fitted to the key member 35 when the key groove 34 is attached to the third member 3, the inclined surface 34d of the key groove 34 is guided by the inclined side surface 35d of the key member 35 to fit each other, and the flat surface 34c of the key groove 34 is formed. Is abutted against the reference surface 35c of the key member 35 and is locked. In this state, the cutter body 22 is precisely centered on the cutter mounting portion 23.

Further, in this state, when the cutter body 22 is fixed to the cutter mounting portion 23 by the clamper 19 and is integrally rotated, the rotating (cutting) torque on the side of the cutter mounting portion 23 of the processing machine 6 is applied to the cutter body 22. Since the portion for transmitting the torque is constituted by surface contact between the reference surface 35c of the key member 35 and the flat surface 34c of the key groove 34, which are perpendicular to the rotation direction, the torque is transmitted reliably and the transmission force is high.

As described above, according to the present embodiment, the cutter body 22 and the cutter mounting portion 23 can be accurately and surely centered, and the rotation torque on the side of the cutter mounting portion 23 is surely and strongly strengthened. Can be communicated to.

In each of the above-described embodiments, the entire outer peripheral surface 24a and the inner peripheral surface 25a of the cutter body 22 and the cutter attachment portion 23 are inclined surfaces having the inclination angle θ, but the inclined surfaces are the cutter body. It may be partially formed in the insertion direction of 22. 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.
Further, four key members and four key grooves are provided, but the present invention is not limited to this, and any other suitable number may be provided, for example, three at equal intervals, as long as precise centering is possible.

[0026]

The present invention has the following effects. (1) According to the attachment mechanism of the pin mirror cutter of claim 1, the outer peripheral surface of the cutter body and the inner peripheral surface of the cutter attachment portion are inclined surfaces that gradually reduce in diameter in the insertion direction of the cutter body. Therefore, when the outer peripheral portion of the cutter body is inserted into and fitted into the inner peripheral portion of the cutter mounting portion, the cutter body is positioned and the cutter body and the cutter mounting portion can be accurately and reliably centered. Therefore, the centering work at the time of attaching the cutter body is facilitated, and the work piece can be processed into a highly accurate perfect circle.

(2) According to the attachment mechanism of the pin mirror cutter of claim 2, 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 10 ° to 45 °. By doing so, it is possible to secure a sufficient supporting force for locking the cutter body during processing and more precise centering.

[Brief description of 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 plan view of a key groove portion of the cutter body of the pin mirror cutter according to the embodiment of the present invention.

FIG. 4 is a view of the key groove in FIG. 3 viewed from a direction of an arrow C.

FIG. 5 is a plan view of a key member according to an exemplary embodiment of the present invention.

FIG. 6 is a sectional view taken along line ZZ in FIG.

FIG. 7 is a plan view of a main part of a conventional pin mirror cutter.

FIG. 8 is a schematic configuration diagram of a processing machine to which a pin mirror cutter is attached.

FIG. 9 is a sectional view taken along line XX of FIG. 7;

FIG. 10 is a side view of a key groove portion of the cutter body.

[Explanation of symbols]

 21 pin mirror cutter 22 cutter body 23 cutter mounting portion 24 flange 24a outer peripheral surface 25 annular taper portion 25a inner peripheral surface θ inclination angle

Claims (2)

[Claims] 1. A pin which is detachably attached to a cutter mounting portion of a processing machine, which is rotationally driven, and which has a cutter body having an annular shape and cutting blades arranged in an inner peripheral portion, and is connected so as to integrally rotate. In the attachment mechanism of the mirror cutter, the cutter body is attached by inserting the outer peripheral portion of the cutter body into the inner peripheral portion of the cutter mounting portion in a fitted state, and the outer peripheral surface of the cutter body and the inner peripheral surface of the cutter mounting portion. The pin mirror cutter attachment mechanism is characterized in that it is an inclined surface that is in face-to-face contact with each other and that gradually decreases in diameter in the insertion direction of the cutter body with respect to the cutter attachment portion. 2. The mounting mechanism for a pin mirror cutter according to claim 1, wherein the outer peripheral surface of the cutter body and the inner peripheral surface of the cutter mounting portion have an inclination angle of 10 ° to 45 ° with respect to the axial direction of the cutter mounting portion. Pin mirror cutter mounting mechanism characterized by being set in the range of.