JPH06262423A - Mounting mechanism for pin miller cutter - Google Patents

Abstract

PURPOSE:To facilitate the attaching/detaching work for a pin miller cutter only by allowing a cutter press to be retractable from a wall surface of a recessed part to enable the restriction/release of the tool body in the pin miller cutter to work the crankshaft of an internal combustion engine where the cutting edges are arranged in the inner circumferential pat of an annular tool body. CONSTITUTION:When a pin miller cutter 5 is mounted on a cutter mounting part of a working machine, the respective positioning parts 25 are retracted from the wall surface 11a of a recessed part 11 by first retracting a pair of movable keys 23 in a cutter mounting mechanism 20, and at the same time, engagement parts 32 are retracted from the wall surface 11a by retracting all cutter presses 30 to the outer ciucumferential side in the radial direction. A key groove 15 and a fixed key 22 are positioned in the circumferential direction, and then, inserted into the recessed part 11. Then, the positioning parts 25 and the key grooves 15 are fitted by advancing the movable keys 23 to the center side in the radial direction. The lower surface 35 of the engagement part 32 is closely attached to the bottom surface 31a of the recessed part 31 for clamping the tool body 1 by advancing the cutter press 30 having the inclined lower surface.

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 attachment mechanism for attaching and detaching a pin mirror cutter for machining a crankshaft of a reciprocating internal combustion engine to a cutter attachment portion provided on a processing machine, In particular, the present invention relates to a pin mirror cutter attachment mechanism suitable for use when automating the attachment and detachment of the pin mirror cutter.

[0002]

2. Description of the Related Art As a tool for machining a crankshaft of a reciprocating internal combustion engine, for example, as shown in FIGS.
A plurality of tips 2 are formed on the inner peripheral portion of the tool body 1 having an annular shape.
However, there is provided a pin mirror cutter 5 which is detachably attached by means of bolts 4 in a state in which the respective cutting edges 3 ... Are projected from the inner circumference or the side surface of the tool body 1. Then, as shown in FIG. 9, such a pin mirror cutter 5 is attached to a cutter attachment portion 7 provided in the processing machine 6 with its axis aligned with a main shaft (not shown), and then the main shaft is removed. Is rotated in a fixed direction (direction of arrow A in FIG. 6) about its own axis. At this time, the chucks 9 and 10 provided in the processing machine 6 are crankshafts (not shown) so as to penetrate the inner peripheral side of the pin mirror cutter 5.
The crankshaft is appropriately moved in the axial direction, the radial direction and the circumferential direction with respect to the pin mirror cutter 5, so that the crankshaft is processed into a predetermined shape by the cutting edge 3 of the pin mirror cutter 5. It

By the way, in the machining of a crankshaft using the pin mirror cutter 5 as described above, the coaxiality between the axis of the pin mirror cutter 5 and the rotation axis of the main shaft of the machining machine 6 has a great influence on the machining accuracy. Therefore, in the pin mirror cutter 5 and the processing machine 6 described above, as shown in FIGS. 6 and 7, the cutter mounting portion 7 of the processing machine 6 is provided with the concave portion 11 coaxial with the main shaft, while the pin mirror cutter 5 of the processing machine 6 is formed. A flange 12 is formed on the outer peripheral portion of the tool main body 1 so that these are fitted to each other, and four key members 13 protruding from the wall surface 11a on the wall surface 11a facing the radial center side of the recess 11 ... ), And when these key members 13 are viewed in a plan view from the axial direction of the recess 11, the widthwise center lines m of the key members 13 intersect in the radial center P of the recess 11 so as to draw a cross. Accurate positioning and bolt 1
On the other hand, the key groove 15 having the same width as the key member 13 is formed in the same arrangement as the key member 13 on the outer peripheral portion of the tool body 1 of the pin mirror cutter 5, and the key member 13 and the key groove 15 are fixed to each other. By fitting them, the radial movement of the tool body 1 with respect to the recess 11 is restricted, and the coaxiality is increased.

With the above-described structure, the tool body 1 has its axis aligned with the axis of the recess 11 and the cutter mounting portion 7 is provided.
Bolts 16 are attached to the tool body 1, and the bolts 16 are screwed into screw holes (not shown) opened in the bottom surface 11b of the recess 11 to tighten the tool body 1 in the axial direction. Then, the attachment of the pin mirror cutter 5 to the processing machine 6 is completed.

[0005]

By the way, in the structure in which the pin mirror cutter 5 described above is tightened with the bolts 16,
Since it is unavoidable to provide a plurality of bolts 16 in the circumferential direction, it takes a considerable amount of time to tighten all the bolts 16, and the efficiency of cutter attachment / detachment work has significantly deteriorated. And, such a drawback has been a big obstacle especially when the attachment / detachment of the pin mirror cutter 5 is automated. That is, the bolt 16
As long as the configuration in which the bolts are fastened is adopted, the bolts 16 must be operated by mechanical fastening means in order to achieve the automation of cutter attachment / detachment. If the bolts 16 are completely tightened at once, an imbalance in tightening force occurs. Therefore, it is necessary to tighten the bolts 16 alternately and gradually, which inevitably complicates the control and prolongs the cycle time. On the other hand, when the fastening means is provided by the number corresponding to the number of the bolts 16, the cycle time can be shortened, but the installation cost and space of the machine significantly increase.

The present invention has been made under such a background, and facilitates the work of mounting the pin mirror cutter on the cutter mounting portion of the processing machine, and can easily realize the automation of attachment and detachment of the pin mirror cutter. An object is to provide a mounting mechanism for a pin mirror cutter.

[0007]

In order to solve the above-mentioned problems, the present invention provides a cutter provided on a processing machine with a pin mirror cutter in which cutting edges are arranged on an inner peripheral portion of an annular tool main body. A mounting mechanism for a pin mirror cutter that is attached to and detached from a mounting portion, wherein the cutter mounting portion of the processing machine is formed with a recess that can be fitted with the outer periphery of the tool body of the pin mirror cutter, and around this recess. , A plurality of cutter retainers each having a locking surface facing the bottom surface facing the axial direction of the concave portion are attached in a state of being retractable from a wall surface facing the radial direction of the concave portion, and At the outer peripheral edge portion, a restraining surface capable of contacting with the engaging surface of the cutter retainer is formed, and at least one of the engaging surface of the cutter retainer and the restraining surface of the tool body is Radial center of the recess And it is characterized in that formed by formed from the bottom surface of the recess in the inclined surface shape away gradually in the axial direction of the recessed portion toward the.

[0008]

In the mounting mechanism of the pin mirror cutter having the above structure, the tool body of the pin mirror cutter is inserted into the recess formed in the cutter mounting portion of the processing machine, and then the cutter retainer is projected to engage the retaining surface of the cutter retainer. And the restraining surface of the tool body are brought into contact with each other. Since either one of the locking surface and the restraining surface is formed in the shape of an inclined surface that gradually becomes more distant from the bottom surface of the recess as it goes toward the center of the recess in the radial direction, the cutter retainer is pressed from the wall surface of the recess toward the center of the radial direction. The pushing force is converted into a force that pushes the tool body toward the bottom surface of the recess, whereby the tool body is clamped between the bottom surface of the recess and the engagement surface of the cutter retainer and is firmly restrained in the axial direction. As described above, in the mounting mechanism having the above-described configuration, the tool body can be axially restrained or released by merely projecting and retracting the cutter retainer with respect to the wall surface of the recessed portion. The tool body can be quickly attached and detached. In addition, since the cutter retainer can be operated in a linear motion in one direction that emerges from the wall surface of the recess, the operation is simplified compared to the case where bolts are tightened. Therefore, the mechanism for moving the cutter retainer is simple and compact. Can be configured to.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those of the conventional example shown in FIGS. 6 to 8 are designated by the same reference numerals and the description thereof will be omitted.
Further, in this embodiment, not only the structure for pressing the tool body of the pin mirror cutter in the axial direction of the recess but also the key member is changed to facilitate the alignment of the tool body and the recess. ing. Therefore, in the following description, the changed points of the key member will be described first, and then the portion for pressing the tool body will be described.

As shown in FIG. 1, in the mounting mechanism 20 of the pin mirror cutter of this embodiment, the key member 21 arranged on the wall surface 11a facing the radially inner peripheral side of the concave portion 11 is the bolt 1.
The two fixed keys 22 fixed at 4 and the two movable keys 23 (only one of which is shown in the figure) provided to be retractable from the wall surface 11a are provided separately.
And the movable keys 23 are placed in a positional relationship in which the center lines m1 and m2 in the width direction are common, and the fixed key 22 and the movable key 2 are arranged.
3 has a positional relationship such that widthwise centerlines m1 and m2 form a cross that intersects at the radial center P of the recess 11. Here, the fixed key 21 is formed in the shape of a rectangular parallelepiped having the same width as the key groove 15 of the tool body 1 and is fitted into the key mounting groove 24 formed around the recessed portion 11, like the conventional key member 13 described above. The recess 1
1 is positioned at a predetermined position in the circumferential direction.

On the other hand, as shown in FIGS. 1 and 2, the pair of movable keys 23 are slidably fitted into a positioning portion 25 directed toward the radially inner side of the recess 11 and a key guide groove 26 of the recess 11. And the sliding portion 27 has the key guide groove 2
By being guided by 6 and sliding in the radial direction of the recess 11, that is, along the center line m2 in the width direction, the positioning part 25 is projected and retracted from the wall surface 11a. Positioning part 25
Is formed in a rectangular parallelepiped shape having the same width as the key groove 15 so that it can be fitted into the key groove 15 of the tool body 1 without a gap, and the movable key 23 of the movable key 23 is formed at the tip thereof toward the radial center of the recess 11. Slopes 28, 28 are formed so as to approach the center side in the width direction. The length of the positioning portion 25 in the direction along the center line m2 in the width direction is set to be slightly longer than the key groove 15 of the tool body 1. The inclined surface 28 is provided to smoothly guide the positioning portion 25 to the key groove 15 of the tool body 1 when the movable key 23 is projected from the wall surface 11a.

The sliding portion 27 of the movable key 23 has a lower surface 27a which abuts on a bottom surface 26a of the key guide groove 26, and
An upper surface 27b parallel to the lower surface 27a and upper and lower surfaces 27b
The wall surface 26 of the key guide groove 26, which is arranged between a and 27b
The side surface 27c has side surfaces 27c and 27d that come into contact with b and 26c, respectively, and the side surface 27c located on the opposite side to the rotation direction of the pin mirror cutter 5 (direction of arrow A in FIG. 1) is the lower surface 27a.
While being formed in a plane orthogonal to the side surface 27 on the opposite side
As d goes from the lower surface 27a to the upper surface 27b, the side surface 27c
The movable key 2 is formed by forming an inclined surface approaching the
3 is prevented from coming off from the key guide groove 26.

Here, the side surface 27c is not formed as an inclined surface similar to the side surface 27d but is formed on a plane orthogonal to the lower surface 27a because the cutting resistance F transmitted from the tool body 1 to the movable key 23 at the time of cutting. , The movable key 23 is the key guide groove 26
This is because the wall surface 26b is pressed against the wall surface 26b opposite to the rotation direction, so that the wall surface 26b and the side surface 27c are planes with which the accuracy can be easily obtained to improve the positioning accuracy of the movable key 23. When the side surface 27c and the wall surface 26b are used as the reference planes for positioning the movable key 23 in the circumferential direction,
As shown by the chain double-dashed line in FIG. 2, a side surface 27d forming an inclined surface.
It is preferable that a wedge plate-shaped spacer S be inserted between the side wall 27c and the wall surface 26c of the key guide groove 26 to positively bring the side surface 27c and the wall surface 26b into close contact with each other.

On the rear end side of the sliding portion 27 of the movable key 23,
Key driving means (not shown) for moving the movable key 23 along the center line m2 in the width direction is provided. As the key driving means, for example, a known actuator such as a hydraulic cylinder, a biasing means such as a spring, or a cam mechanism is used. Instead of connecting the hydraulic cylinders, a cylinder chamber is formed between the key guide groove 26 and the rear end side of the sliding portion 27, and the movable key 23 is pulled inward to the key guide groove 26. Movable key 23 with spring
May be driven according to the difference between the hydraulic pressure and the elastic force of the spring.

In the pin mirror cutter mounting mechanism 20 of this embodiment, the tool main body 1 has the following construction.
Are pressed against the bottom surface 11b of the recess 11. That is, as shown in FIG. 1, in this embodiment, a plurality of cutter pressers 30 (8 in total at a pitch of 45 ° in the illustrated example) are arranged around the recess 11 at appropriate intervals. The movement of the tool body 1 in the axial direction is restricted by the engagement of 30 with the clamping recesses 31 ... Formed on the outer peripheral portion of the tool body 1.

Here, the cutter retainer 30 has a sliding portion 34 that engages with an engaging portion 32 protruding from the wall surface 11a of the recess 11 and a cutter retaining guide groove 33 formed around the recess 11.
And the sliding portion 34 slides in the radial direction of the concave portion 11 along the cutter pressing guide groove 33, so that the engaging portion 32 projects from the wall surface 11a of the concave portion 11 and the engaging portion 32. And the clamping recess 31 of the tool body 1 are engaged with each other, or these engagements are released.

The engaging portion 32 is formed to be slightly smaller than the clamping concave portion 31 so that the engaging portion 32 can be smoothly inserted into and removed from the clamping concave portion 31, and the movable key 2 is further provided at the tip portion thereof.
An inclined surface 32a similar to that of No. 3 is formed. Also, FIG.
As shown in FIG. 5, the lower surface (locking surface) 35 of the engaging portion 32 is located on the bottom surface 11 b of the concave portion 11 as it goes toward the radial center of the concave portion 11.
Is formed on an inclined surface spaced apart from. The bottom surface (restriction surface) 31a of the clamping recess 31 of the tool body 1 is also formed in an inclined surface shape corresponding to the lower surface 35 of the engaging portion 32 of the cutter retainer 30. As a result, to the radial center side of the cutter retainer 30. Moves to bring the lower surface 35 of the engaging portion 32 into close contact with the bottom surface 31a of the clamping recess 31, and the force pressing the cutter retainer 30 in the radial direction presses the flange 12 of the tool body 1 against the bottom surface 11b of the recess 11. The tool body 1 is converted into the force of the concave part 11b and the lower surface 35 of the cutter holder 30 and the concave bottom surface 11b.
It is sandwiched between and to be firmly restrained in the axial direction. A hydraulic cylinder, a spring, a cam mechanism, or the like is used as the means for moving the cutter retainer 30 in the radial direction of the recess 11, as in the case of the movable key 23.

Further, as shown in FIG. 4, the cutter holder 3
The side surfaces 34a and 34b of the sliding portion 34 of
4 is formed on the inclined surface which approaches the widthwise center side of the cutter retainer 30 from the lower surface 34c toward the upper surface 34d, thereby preventing the cutter retainer 30 from being lifted up by the reaction force when the tool body 1 is pressed. ing.

Further, as shown in FIGS. 1 and 5, the side surface 1a of the tool body 1 is formed with a gripping groove 40 opening to the outer periphery of the tool body 1. These grip grooves 40 are for gripping the tool main body 1 by a gripping means such as a handling robot, and have inclined surfaces 42 that are distant from each other from the center position of the tool main body 1 in the axial direction toward the side surface 1a. Then, these inclined surfaces 42 are formed, for example, in FIG.
As shown by a two-dot chain line, the gripping claw 43 is provided so as to be able to come into contact with and separate from the gripping claw 43 when the pair of gripping claws 43 of the handling robot is opened and closed. The grip claw 43 is moved along the axis of the recess 11 to form the bottom surface 1 of the recess.
The tool body 1 can be pulled out from the recess 11 by moving it in the direction away from 1a.

When the pin mirror cutter 5 is attached to the cutter attaching portion 7 of the processing machine 6 in the pin mirror cutter attaching mechanism configured as described above, as shown by the two-dot chain line in FIG. Set the pair of movable keys 23 to the recess 11
Of each positioning portion 25 by retreating to the outer peripheral side in the radial direction of
Is retracted from the wall surface 11a of the recess 11, and all the cutter retainers 30 are retracted to the outer peripheral side in the radial direction to engage the engaging portions 3
2 is retracted from the wall surface 11a, and in this state, the tool main body 1 is first inserted into the recess 11 after the key groove 15 and the fixed key 22 are aligned in the circumferential direction. As a result, the axis of the tool body 1 first passes on the center line m1 in the width direction. Then, after inserting the tool body 1, the movable key 23
To the center side in the radial direction to move the positioning portion 25 and the key groove 1
And 5 are fitted. As a result, the axis of the tool body 1 also passes over the center line m2 in the width direction, and the axes of the tool body 1 and the recess 11 are exactly aligned. Then, after the axes of the tool body 1 and the recess 11 are aligned with each other as described above, the cutter retainer 30 is advanced to bring the lower surface 35 of the engaging portion 32 into close contact with the bottom surface 31a of the clamping recess 31 of the tool body 1. . As a result, the flange 12 of the tool body 1 is pressed against the bottom surface 11a of the recess 11.

As described above, in the present embodiment, the cutter body 30 is inserted after the tool body 1 is inserted into the recess 11 and the axes are aligned.
Since the tool body 1 can be restrained in the axial direction or released from the restraint simply by moving the tool to the center side in the radial direction, the tool body 1 can be quickly attached and detached as compared with the conventional case where the bolt 16 is rotated. obtain. Moreover, since the operation of the cutter retainer 30 is only a linear movement in one direction, the operation is far simpler than the case where the bolt 16 is advanced in the axial direction while rotating. Therefore, the drive means for the cutter retainer 30 is also simplified and downsized.

In the present embodiment, a part of the key member 21 is a movable key 23 in order to facilitate the work of aligning the axes of the tool body 1 in particular, but the present invention is not limited to this. All may be configured with the fixed key 22. Also, the number of cutter retainers 30 can be appropriately changed according to the cutter diameter and the like. In addition, the cutter holder 3
Although the lower surface 35 of 0 and the bottom surface 31a of the tool main body 1 are both formed as inclined surfaces, it is needless to say that the tool main body 1 can be pressed in the axial direction only by making either one of the inclined surfaces.

[0023]

As described above, according to the present invention, the tool body of the pin mirror cutter is pressed and restrained in the axial direction, or the tool body is restrained, only by retracting the cutter retainer from the wall surface of the recess. Since it can be released, the pin mirror cutter can be attached and detached much more quickly than the conventional fastening structure using bolts. Moreover, since the cutter retainer can be operated in a linear motion in one direction that emerges from the wall surface of the recess, the operation is simplified as compared with the case where the bolt is tightened. Therefore, the mechanism for driving the cutter retainer is also improved. It can be remarkably simplified and downsized as compared with the case of operating the bolt. As described above, according to the present invention, automation of attachment / detachment of the pin mirror cutter can be easily realized.

[Brief description of drawings]

FIG. 1 is a view showing a mounting mechanism of a pin mirror cutter according to an embodiment of the present invention when viewed in plan from the axial direction of the pin mirror cutter.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along line VV of FIG.

FIG. 6 is a plan view showing a conventional pin mirror cutter attachment mechanism as viewed in the axial direction of the pin mirror cutter.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a view from the direction of the arrow VIII in FIG.

FIG. 9 is a diagram showing a schematic configuration of a processing machine to which a pin mirror cutter is attached.

[Explanation of symbols]

 1 Tool Main Body 3 Cutting Edge 5 Pin Mirror Cutter 6 Processing Machine 7 Cutter Mounting Part 11 Recess 11a Recess Wall 11b Recess Bottom Bottom 20 Pin Mirror Cutter Mounting Mechanism 30 Cutter Press 31a Clamp Recess Bottom (Restricting Surface) 35 Cutter Presser Bottom surface (locking surface)

Claims (1)

[Claims] 1. A pin mirror cutter attachment mechanism for attaching and detaching a pin mirror cutter comprising cutting tools arranged on an inner peripheral portion of an annular tool body to a cutter attachment portion provided on a processing machine, The cutter mounting portion of the processing machine is formed with a concave portion that can be fitted to the outer periphery of the tool body of the pin mirror cutter, and around the concave portion, a locking surface that faces the bottom surface of the concave portion facing the axial direction. A plurality of cutter holders provided with are attached in a state of being able to project and retract from the wall surface facing the radial direction of the concave portion, and in the outer peripheral edge portion of the tool body of the pin mirror cutter,
A restraint surface that is capable of abutting against the engaging surface of the cutter retainer is formed, and at least one of the engaging surface of the cutter retainer and the restraining surface of the tool body is a radial center of the recess. An attachment mechanism for a pin mirror cutter, characterized in that the attachment mechanism is formed in an inclined surface shape that gradually distances from the bottom surface of the concave portion in the axial direction of the concave portion toward the side.