JPH06206114A - Installation mechanism for pin mirror cutter - Google Patents

Abstract

PURPOSE:To facilitate and automate the mounting and demounting of a pin mirror cutter by installing a pair of fixed keys and a pair of movable keys, as for an installation mechanism for mounting and demounting the pin mirror cutter for working the crankshaft of an internal combustion engine, at a cutter installation part installed on a working machine. CONSTITUTION:A cylindrical recessed part 11 which can be fitted with the outer periphery of a tool body 1 is formed at the cutter installation part of a working machine on which a pin mirror cutter (hereinafter, called as cutter) 5 which is formed by arranging cutters 3 at the inner peripheral part of a tool body 1 having an annular form is installed. On the wall surface of the recessed part 11, four key members 21 which can be fitted into four keyways 15 formed on the outer periphery of the tool body 1 are projectingly installed on the center lines m1 and m2 crossing perpendicularly at the center P of the recessed part 11. The key member 21 on the center line m1 among the key members 21 is used as a fixed key 22, and the key member 21 on the center line m2 is used as a movable key 23 which can appear and disappear from the recessed part 11. After the fixed key 22 is fitted with the keyway 15, the cutter 5 can be positioned and fixed by fitting the movable key 23 with the keyway 15.

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 above-mentioned configuration in which the pin mirror cutter 5 is centered by the cross-shaped key member 13, the width of the key member 13 and the width of the key groove 15 are naturally free from rattling. To be matched exactly. Therefore, when the tool body 1 is inserted into the recess 11, the axis of the tool body 1 is aligned with the axis of the recess 11 and the key member 13 and the key groove 15 are aligned in the circumferential direction, and then the tool body 1 is inserted. Must be moved exactly parallel to the axis. However, such an operation is extremely difficult because an operator must perform the operation while supporting the heavy pin mirror cutter 5.

In the processing machine 6 described above, it has been attempted to automate the work of attaching and detaching the pin mirror cutter 5 to and from the cutter mounting portion 7 in order to improve work efficiency. However, as long as the key member 13 arranged in a cross shape is used for centering the tool body 1, the axis of the tool body 1 is made to coincide with the axis of the recess 11 and the key member 13 is inserted when the tool body 1 is inserted. There is no change in that the tool body 1 has to be moved precisely parallel to the axis after aligning the circumferential positions of the key groove 15 and the key groove 15, and the tool body 1 is mounted to realize such an operation. The handling robots and the like are required to have high accuracy and rigidity, which has been an obstacle to promoting automation. The present invention has been made under such a background, and facilitates the work of attaching the pin mirror cutter to the cutter mounting portion of the processing machine, and thus can easily realize the automation of attachment and detachment of the pin mirror cutter. It is an object of the present invention to provide a mounting mechanism of.

[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 to the outer periphery of the tool body of the pin mirror cutter, and the radial center of this recess. On the side-facing wall surface, the four key members projecting from the wall surface draw a cross in which the width-direction center lines intersect at the radial center of the recess when viewed in plan from the axial direction of the recess. Of the key members, a pair of key members facing each other in the radial direction of the recess are provided so as to be retractable from the wall surface of the recess, and the key member is provided on the outer peripheral portion of the pin mirror cutter. Key that can be mated Groove is characterized in that become formed in the same arrangement as the key member. In this case, in order to smoothly fit the pair of key members that can be projected and retracted from the wall surface of the concave portion and the key groove of the tool body, the inner peripheral end of the key member should have a radial center side of the concave portion. It is preferable to form an inclined surface that approaches the center side in the width direction of the key member as it goes toward.

[0008]

According to the above construction, of the key members arranged in a cross shape, a pair of key members facing each other in the radial direction of the recess are retracted from the wall surface of the recess, and then the tool body of the pin mirror cutter is moved. Then, the key groove is circumferentially positioned so as to fit with the other pair of key members protruding from the wall surface of the recess, and the key groove is inserted into the recess of the cutter mounting portion. As a result, the axis of the tool body passes on the center line in the width direction of the pair of key members that fit into the key groove of the tool body. After the tool body is inserted into the recess, the remaining pair of key members are projected toward the center of the recess in the radial direction and fitted into the key groove of the tool body. As a result, the axis of the tool main body also passes over the center line in the width direction of the pair of key members, and as a result, the axes of the tool main body and the concave portion are exactly aligned.

[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.

As shown in FIG. 1, the mounting mechanism 20 of the pin mirror cutter of this embodiment differs from the conventional example shown in FIGS. 6 and 7 in that it is arranged on the wall surface 11a facing the radially inner side of the recess 11. The provided key member 21 is fixed with the bolt 14 2
Two fixed keys 22 and two movable keys 23 (only one of which is shown in the figure) provided to be retractable from the wall surface 11a.
There is a point that they are provided separately for each type, and the fixed keys 22 are
The movable keys 23 are placed in a positional relationship in which the width direction center lines m1 and m2 are common, and the width direction center lines m1 and m2 of the fixed key 22 and the movable key 23 are the radial center P of the recess 11. It is in a positional relationship that draws a cross that intersects. 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. As a result, the recess 11 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.

At the rear end side of the sliding portion 27 of the movable key 23, there is provided a key driving means (not shown) for moving the movable key 23 along the center line m2 in the width direction. 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. A spring may be provided and the movable key 23 may be driven according to the difference between the hydraulic pressure and the elastic force of the spring.

Here, in the pin mirror cutter mounting mechanism 20 of the present embodiment, in addition to the above-mentioned key member 21, a means for restraining the axial movement of the tool body 1 of the pin mirror cutter 5 is also conventional. The bolt 16 has been changed to a different configuration. 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, the lower surface 35 of the engaging portion 32 is formed as an inclined surface that is more distant from the bottom surface 11b of the recess 11 toward the center of the recess 11 in the radial direction. The bottom 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. This allows the cutter retainer 30 to move toward the center in the radial direction. Lower surface 35 of mating portion 32 and bottom surface 31a of recess 31 for clamping
Are closely contacted with each other, and the force pressing the cutter retainer 30 in the radial direction is converted into the force for pressing the flange 12 of the tool body 1 to the bottom surface 11b of the recess 11 to allow the tool body 1 to move to the bottom surface 1 of the recess.
It is sandwiched between 1b and the lower surface 35 of the cutter retainer 30 and is 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, for example, as shown 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 constructed as described above, as shown by the two-dot chain line in FIG. , The pair of movable keys 23 to the recess 1
1 of each positioning part 2 by retreating to the outer peripheral side in the radial direction.
5 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 retract the engaging portions 32 from the wall surface 11a. After being aligned with the fixed key 22 in the circumferential direction, the fixed key 22 is inserted into the recess 11. As a result, first, the axis of the tool body 1 is the center line m in the width direction of the fixed key 22.
It will pass over 1. Then, after inserting the tool body 1, the movable key 23 is advanced to the center side in the radial direction so that the positioning portion 25 and the key groove 15 are fitted to each other. As a result, the axis of the tool body 1 also passes over the center line m2 in the width direction of the movable key 23, and as described above, the tool body 1 and the recess 11 are formed.
The axes of and match exactly. After performing the centering in the above procedure, the cutter retainer 30 is then advanced to move the engaging portion 32.
Bottom surface 35 of the tool 3 and the bottom surface 3 of the clamping recess 31 of the tool body 1.
1a and the flange 1 of the tool body 1
2 is pressed against the bottom surface 11a of the recess 11.

In the above mounting procedure, the tool body 1 is set in the recess 1
Since the movable key 23 is retracted from the recess 11 when it is attached to the tool 1, the tool body 1 can be inserted into the recess 11 as long as the pair of fixed keys 22 and the key groove 15 are aligned in the circumferential direction. The tool body 1 can be installed even before it is inserted into the recess 11.
It is not necessary to exactly match the axis line of 1 with the axis line of the recess 11. That is, referring to FIG. 1, even if it is necessary to adjust the position of the tool body 1 so that the key grooves 15 are aligned on the center line m1 in the width direction of the fixed key 22 when the tool body 1 is inserted, It is not necessary to accurately align the key grooves 15 on the center line m2 in the width direction of the movable key 23. And the tool body 1
The movable key 23 is keyed in the key groove 15 to align the center with the recess 11.
It is naturally achieved by fitting to.

As described above, in this embodiment, when the tool main body 1 is attached, the key members 20 arranged in a cross shape.
Since it is not necessary to align the positions of all of the tools and all of the key grooves 15 before the insertion, the restriction on the positioning when inserting the tool body 1 into the recess 11 is greatly relaxed as compared with the conventional case, and as a result, It becomes possible to perform the mounting operation of the pin mirror cutter 5 much easier and more efficiently than in the past. In particular, when the pin mirror cutter 5 is attached / detached by a mechanical means, the requirement for the positioning accuracy of the robot or the like that attaches the pin mirror cutter 5 is relaxed, which is extremely effective for automation promotion.

In this embodiment, the cutter body 30 is used to press the tool body 1 in the axial direction. However, even if the tool body 1 is tightened with the bolt 16 as in the conventional case, the centering of the tool body 1 is facilitated, which is the effect of the present invention. Of course, is not damaged.

[0024]

As described above, according to the present invention, of the key members arranged around the recess, a pair of key members opposed to each other in the radial direction of the recess can be retracted from the wall surface facing the radial direction of the recess. Since it is provided, the positioning constraint when mounting the tool body of the pin mirror cutter in the recess formed in the cutter mounting part of the processing machine is relaxed more than before, and the cutter mounting work is easier and more efficient. Can be planned. Especially when automating the attachment / detachment of the pin mirror cutter, the requirements for accuracy and rigidity of the attachment device such as a robot used when attaching the tool body are relaxed, so that the 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 Blade 5 Pin Mirror Cutter 6 Processing Machine 7 Cutter Mounting Part 11 Recess 11a Recess Wall 15 Key Groove 20 Pin Mirror Cutter Mounting Mechanism 21 Key Member 22 Fixed Key 23 Movable Key 28 Movable Key Inclined Surface m1, m2 width direction center line

Claims (2)

[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 recess that can be fitted to the outer periphery of the tool body of the pin mirror cutter. The wall surface of the recess facing the center in the radial direction has four keys protruding from the wall surface. The members are arranged so that, when viewed in plan from the axial direction of the recess, the width-direction center lines of the members intersect in the radial center of the recess to draw a cross, and among the key members, the radial direction of the recess A pair of key members facing each other are provided so as to be retractable from the wall surface of the concave portion, and a key groove that can be fitted with the key member is formed in the same arrangement as the key member on the outer peripheral portion of the pin mirror cutter. What has been done Attachment mechanism pin mirror cutter characterized. 2. An inclined surface that approaches the center of the key member in the width direction as it goes toward the center of the recess in the radial direction is formed at the inner peripheral ends of the pair of key members that can be retracted from the wall surface of the recess. The attachment mechanism for the pin mirror cutter according to claim 1, wherein the attachment mechanism is formed.