JPS6344482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tool post with a cutting edge position correction device attached to a machine tool, and in particular, the cutting edge position of the cutting tool does not move when processing a workpiece, and the cutting edge position does not change during correction. This invention relates to a tool rest that can be easily moved.

In recent years, tool rests attached to machine tools have become easier to operate due to the need to compensate for slight machining errors in the workpiece (hereinafter referred to as "workpiece") caused by wear and tear on the cutting edge of the cutting tool. A so-called blade edge position correction device, which allows fine adjustment of the blade edge position, is becoming increasingly available. As one such tool rest with a cutting edge position correction device, one using a so-called eccentric shaft has been proposed.

A tool rest with a cutting edge position correction device that uses an eccentric shaft is generally provided with a tool rest main body to be attached to a machine tool and in the front and back direction of the tool rest main body, and is provided with an eccentric shaft that is rotatably held and has a fitting hole or fitting protrusion with a circular cross section centered on a second centerline that is eccentric by a predetermined amount with respect to the first centerline; and an eccentric shaft that is perpendicular to the first centerline. a cutter holder, which has an abutment plane capable of abutting on the turret main body from the front, is rotatably fitted into the fitting hole or the fitting protrusion, and is prevented from rotating relative to the turret main body; The apparatus is configured to include an input member and an eccentric shaft rotation mechanism that rotates the eccentric shaft by a certain angle each time the input member is moved by a predetermined amount. Each time the input member of the eccentric shaft rotation mechanism is actuated manually or by an appropriate actuator, the eccentric shaft is rotated by a certain angle, and based on each rotation of the eccentric shaft, the cutter holder is rotated to rotate the cutter. By moving the tool relative to the main body in a direction perpendicular to the first center line, the position of the cutting edge of the cutting tool is corrected.

By the way, in the above-mentioned tool post, it is necessary to prevent the position of the cutting edge from moving relative to the main body of the tool post when machining a workpiece. A biasing means such as the above is provided, and its biasing force causes the contact plane of the cutting tool holder to contact the tool rest main body from the front, thereby preventing relative movement of the former with respect to the latter. Therefore, during the correction, it is necessary to move the cutting tool holder against the frictional force between the contact plane of the cutting tool holder and the tool rest main body caused by the biasing force. That is, conventionally, the biasing force of the biasing means is set to an appropriate magnitude in advance,
The aim was to satisfy both the conditions of preventing fluctuations in the position of the cutting edge during workpiece machining and movability of the cutting tool holder when correcting the position of the cutting edge.

However, in the case of the conventional tool post with a cutting edge position correction device that uses a biasing means to prevent relative movement of the tool holder with respect to the tool post main body, it is difficult to prevent the tool from moving during heavy or medium cutting. That is, when a large force is applied to the cutting tool holder in the direction opposite to the direction of the urging force of the urging means, the cutting tool holder, that is, the position of the cutting edge of the cutting tool moves relative to the tool rest body. The actual situation is that it is unavoidable that the workpiece be stored away, making it impossible to use it, or even if it is possible, variations in the workpiece machining diameter occur. Therefore, the above-mentioned conventional tool rest cannot perform heavy cutting or medium cutting, and it is necessary to provide separate processes such as rough machining and semi-finishing machining, which has the drawback of increasing equipment costs. In order to enable heavy or medium cutting with the conventional tool post and to keep the equipment costs low, it is sufficient to increase the biasing force of the biasing means. There was a problem in that the frictional force between the contact plane of the body and the tool rest main body also increased, making it impossible to correct the position of the cutting edge.

The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to easily correct the position of the cutting edge, and to improve the position of the cutting edge when machining a workpiece. It is an object of the present invention to provide a tool rest with a cutting edge position correction device that can strongly hold the blade and perform precision machining involving heavy or medium cutting.

In order to achieve this object, the present invention provides a tool post with a cutting edge position correction device as described above, in which the piston rod is fixed to either the tool post main body or the cutting tool holder, and the piston rod is fixed to the other. A cylinder that is connected to the turret body and firmly presses the abutment plane of the cutter holder against the turret main body by movement of its piston rod in one direction, thereby fixing the cutter holder and the turret main body; An interlocking mechanism is provided that operates the input member of the eccentric shaft rotation mechanism in conjunction with the movement in the direction.

In this way, the tool holder and the turret main body are fixed in a state where the contact plane of the tool holder is strongly pressed against the turret main body by the movement of the piston rod of the cylinder in one direction. Even if a large force is applied to the tool holder, the tool holder does not move relative to the turret body, making it possible to perform rough machining or semi-finishing and precision finishing. This makes it possible to use the same tool rest. On the other hand, when the piston rod of the cylinder is moved in the opposite direction, the fixation between the cutter holder and the turret main body is released, and the interlocking mechanism operates the input member of the eccentric shaft rotation mechanism. Since the eccentric shaft is rotated by the turret and the tool holder is moved relative to the turret main body, the correction of the cutting edge position is not limited in any way by the conditions of fixing the tool holder and the turret main body by the fixing mechanism. It is extremely easy to do.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In Fig. 1, reference numeral 2 denotes a turret main body to be attached to the turret mounting part of a machine tool with a plurality of bolts 4. A through hole 8 with a circular cross section extends in the front and rear direction across the fixed unit case 6.
is formed, and an eccentric shaft 10 is inserted concentrically into this through hole 8 (with this center line as the first center line). The eccentric shaft 10 is connected to the rear shaft portion 12
and a front cylindrical eccentric part 14,
The center line of the fitting hole 16 inside the eccentric portion 14 (this center line is referred to as a second center line) is slightly eccentric from the first center line. The eccentric part 14 is inserted into the through hole 8 of the main body 2, and is rotatably supported with a negative clearance by a steel ball bearing 20 arranged with the spacer 18 between the eccentric part 14 and the inner wall of the through hole 8. ing.

In the fitting hole 16 of the eccentric part 14, a bottomed cylindrical adapter 24 having a flange part 22 that comes into contact with the turret main body 2 at the front opening periphery of the through hole 8 is fitted with spacers 26, 28 and a steel ball bearing. 30 and are fitted with a negative clearance. The adapter 24 is attached to the eccentric shaft 10 by means of a special bolt 34 through a bush 32 passing through its bottom.
The radial detent groove 36 formed on the outer periphery of the flange portion 22 is connected to a detent pin erected on the front end surface of the turret main body 2. 38, relative rotation with respect to the tool rest main body 2 is prevented. That is, eccentric shaft 1
0 is rotated, its rotation angle and the first
The adapter 24 is adapted to be moved in the radial direction along the anti-rotation groove 36 according to the amount of eccentricity between the center line and the second center line, and a boring quill, which is a cutting tool, is attached to the adapter 24. By fixing the blade 40, the position of the cutting edge can be corrected. Attaching the boring quill 40 to the adapter 24 is as follows:
The positioning is performed by a guide pin 42 and by screwing a bolt (not shown). Note that an O-ring bar 48 having a pair of spacer pins 44 on the front end surface and an O-ring 46 on the outer peripheral surface is inserted between the special bolt 34 and the boring quill 40 in the inner space of the adapter 24. It plays the role of a sealing member. The spacer pin 44 is provided to maintain a certain axial clearance between the fitting protrusion of the boring quill 40 and the O-ring bar 48. An air passage 49 is provided for allowing the inflow and outflow of air.

In the shaft portion 12 of the eccentric shaft 10, a ratchet wheel 52 with ratchet teeth 50 on the outer peripheral surface and a limit detection disk 56 with a pin 54 for detecting the correction limit of the cutting edge position are provided in the inner space of the unit case 6. is fixed. As is clear from FIG. 2, the portion of the unit case 6 facing the ratchet teeth 50 of the ratchet wheel 52 has a
A claw insertion hole 58 is formed perpendicularly to the through hole 8, and these holes communicate with each other at the outer peripheral portion. The opening of the claw insertion hole 58 is closed with a first lid member 60 and a second lid member 62.
A pawl holding member 64 is housed in the space closed by 0 and 62 so as to be slidable in the axial direction, that is, in the circumferential direction of the ratchet wheel 52. The pawl holding member 64 is urged toward the second lid member 62 by the urging force of a compression coil spring 66 provided between the pawl holding member 64 and the first lid member 60, and extends into the pawl insertion hole 58. Rotation around the axis is prevented by sandwiching the pawl guide portion 68 of the second lid member 62 at its rear end in a sandwich-like manner. This claw holding member 6
4, a ratchet pawl 70 that engages with the ratchet teeth 50 of the ratchet wheel 52 is attached to the pin 71.
The central part is rotatably supported. A portion of the ratchet pawl 70 on the pawl side is urged toward the ratchet teeth 50 by a compression coil spring 72, and a portion on the opposite side to the pawl side is formed in the pawl guide portion 68 of the second lid member 62. By engaging with the pawl guide surface 74, the compression coil spring 72
The pawl portion is disengaged from the ratchet tooth 50 against the urging force of the ratchet tooth 50. The above claw guide surface 7
4 is an inclined surface, and the claw holding member 64 is a second inclined surface.
When moved toward the lid member 62, the ratchet pawl 70 is rotated in a direction in which the pawl portion moves away from the ratchet teeth 50 against the biasing force of the compression coil spring 72.

A pin guide groove 76 is formed at a predetermined angle with respect to the first center line on the opposite side of the pawl holding member 64 from the side facing the ratchet teeth 50, and a pin guide groove 76 is formed in the pin guide groove 76 to fix the pin to the push rod 78. The end of the pin 80 that has been removed is inserted. As is clear from FIGS. 1 and 2, the push rod 78 extends axially into a rod insertion hole 82 formed parallel to the through hole 8 and partially communicating with the pawl insertion hole 58, that is, in the first direction. It is inserted so that it can slide in a direction parallel to the center line but cannot rotate, and is connected to the main body 2 by a compression coil spring 84 provided between it and the tool rest main body 2.
It is biased toward the rear side, and is also moved forward by a predetermined amount against the biasing force by an interlocking mechanism, which will be described later.

In other words, the interlocking mechanism allows the push rod 7 to
8 is pushed forward by a predetermined amount, the push rod 78 moves the claw holding member 64 from the second lid member 62 side by an amount corresponding to the inclination angle of the pin guide groove 76 via the pin 80. This movement causes the ratchet pawl 70 to engage with the ratchet tooth 50 and push it by one tooth towards the first lid member 60, thereby releasing the ratchet. ET wheel 52
By rotating the eccentric shaft 10 through the
The amount of movement corresponds to the amount of rotation of the teeth. When the action of the interlocking mechanism is released after this correction, the push rod 78 is pushed back rearward by the biasing force of the compression coil spring 84, and as a result, the claw holding member 64 is moved back to its original position, contrary to the case described above. The ratchet claw 7 is moved from the first lid member 60 side to the second lid member 62 side.
0 is pulled back to its original position while riding over the ratchet teeth 50 without rotating the ratchet wheel 52.

As is clear from the above description, in this embodiment, the eccentric shaft rotation mechanism is constituted by the ratchet wheel 52, the ratchet pawl 70, the pawl holding member 64, the push rod 78, etc., and the push rod 78 as an input member is interlocked. Each time the eccentric shaft 10 is moved by a predetermined amount by the mechanism, the eccentric shaft 10 is rotated by a certain angle (one tooth of the ratchet teeth 50). Through such an operation, the position of the cutting edge of the boring quill 40 is corrected by an amount corresponding to the amount of rotation.

There is a limit to the amount of correction of the position of the cutting edge, and when the correction is made to such a limit, it is necessary to replace the tip of the boring quill 40. In this embodiment, a correction limit detection device is provided to detect the correction limit position, and a correction limit signal is automatically generated when the correction amount reaches a predetermined amount.

That is, in FIG. 3, the dog rod 85 is slidable through the unit case 6 so that one end thereof is located on the rotational trajectory of the pin 54 fixed to the limit detection disk 56 that rotates together with the eccentric shaft 10. It is located in The other end of the dog rod 85 is a contact plate 86 fixed to the end face of the unit case 6.
It penetrates through and projects outward, and is normally biased inward by a compression coil spring 87 between the contact plate 86 and a retaining ring provided on the dowel rod 85, so that the amount of outward protrusion is has been slightly reduced. Then, when the eccentric shaft 10 is rotated by a predetermined angle and the position of the cutting edge is corrected to the correction limit, the pin 54 pushes the dowel rod 85 outward, and the limit switch 88 for correction limit shown in FIG.
is detected. The limit switch 88 is attached to a switch mounting plate 89 fixed to the unit case 6, and upon the above detection, a correction limit signal is generated and sent to a main control circuit (not shown) to stop the operation of the machine tool.

A cylindrical guide member 91 having a flange portion is inserted from the rear into the rear end surface of the unit case 6 and is fixed with a bolt.
The shaft portion 12 is further extended rearward. On the other hand, a plurality of columns 92 are screwed to the rear end surface of the unit case 6, and a cylinder mounting plate 93 is fixed to the tip of each column 92 with bolts. A cylinder 94 is coaxially attached. The piston rod 96 of the cylinder 94 extends forward, and the front end portion of the piston rod 96 and the rear end portion of the shaft portion 12 of the eccentric shaft 10 are connected to a connecting member 98.
connected by. The connecting member 98 has a first connecting member 100 and a second connecting member 10 each having a cylindrical shape with a bottom.
2, which are screwed together with a male threaded part and a female threaded part formed in each opening to form a hollow body. First connecting member 10 on the front side
0 has a through hole 104 at the bottom, and the rear end of the shaft portion 12 is inserted into the cylindrical space of the hollow body through the through hole 104. A contact plate 106 is attached to a bolt 108 on the rear end surface of the shaft portion 12.
It is fixed by. Note that the through hole 10
4 and the shaft portion 12, and the abutting plate 106 and the connecting member 98 are respectively fitted to be slidable in the axial direction. On the other hand, the second connecting member 102 on the rear side is fixed to the piston rod 96 with a bolt 110. Therefore, the actuation force in the backward direction of the piston rod 96 is applied to the abutting plate 106 by the first connecting member 100.
It is not transmitted to the eccentric shaft 10 until it comes into contact with the bottom surface of the
The operating force of the piston rod 96 is transmitted to the eccentric shaft 10 with a predetermined delay.

That is, in this embodiment, the cylinder 94 is connected to the unit case 6, the column 92, and the cylinder mounting plate 9.
The piston rod 96 is fixed to the tool rest main body 2 via the bolt 110, the second connecting member 102, the first connecting member 100, and the abutment plate 10.
6. It is connected to an adapter 24, which is a cutting tool holder, via a bolt 108, an eccentric shaft 10, a pusher 32, and a bolt 34.

A mechanical interlocking mechanism consisting of a bracket 112 and a screw member 114 that penetrates through the bracket 112 and is screwed together and is fixed by a nut 113 is fixed to the connecting member 98. As it moves, the screw member 114 pushes the push rod 78 forward against the biasing force of the compression coil spring 84.

Further, a dividing plate 116 is fixed to the rear surface of the guide member 91, and the rotating plate 1 is disposed close to and facing the dividing plate 116.
18 is attached to the eccentric shaft 8 so as not to be relatively rotatable. Rotating plate 118 is divided plate 116
As a result, the adapter 24 is urged rearward via the retaining ring 121, the eccentric shaft 10, the special bolt 34, and the bush 32. , flange part 2
2 is brought into close contact with the tool rest main body 2. Three ball plungers 122 are attached to the outer periphery of the rotating plate 118 at equal angular intervals of 120 degrees. A ball is held in this ball plunger 122 so as to be biased by a spring and protrude forward from the front surface of the rotary plate 118. On the other hand, a conical shape is formed on one circumference of the dividing plate 116 corresponding to the ball. Forty ball engaging recesses 124 are formed at equal angular intervals of 9 degrees. That is, the angular interval of the ball engaging recesses 124 is made equal to the rotation angle of three teeth of the ratchet teeth 50, and when the return lever 125 fixed to the rotation plate 118 is manually operated, three teeth are rotated. The balls of the ball plunger 122 successively engage with the ball engaging recesses 124 one by one, serving to inform the operator how many teeth of the ratchet teeth 50 the rotary plate 118 has been rotated.

Also, a first
and second dogs 126 and 128 are also attached to the switch mounting plate 89.
Two first and second limit switches 130 and 132 are provided corresponding to 8, respectively.
The limit position of the reciprocating movement of the piston rod 96 of the cylinder 94 is detected. That is, the first
The limit switch 130 issues a forward position limit signal when the piston rod 96 reaches the forward limit position (left side in FIG. 1), while the second limit switch 13
2 generates a backward movement position limit signal when the piston rod 96 reaches the backward movement limit position, and based on these signals, an electromagnetic valve mechanism (not shown) is switched to stop the operation of the cylinder 94.

When processing a workpiece using the above-described tool post with a cutting edge position correction device, the cylinder 94 is operated to pull the piston rod 96 backward until the second limit switch 132 issues a return position limit signal. At this time, the contact plate 106 comes into contact with the bottom surface of the first connecting member 100 of the connecting member 98 at the tip of the piston rod 96, and the eccentric shaft 10 is pulled rearward.As a result, the adapter 24 is pulled rearward, and the abutment plane 134, which is the rear surface of the flange portion 22 of the adapter 24 and is perpendicular to the first center line, is strongly pressed against the front end surface of the tool rest main body 2 at the periphery of the opening of the through hole 8. That is, this completely prevents the adapter 24 as a cutting tool holder from moving in the front-rear direction, and also prevents rotation around the axis and movement in the radial direction, so that the adapter 24 is prevented from moving relative to the main body 2. Thus, the position of the cutting edge of the boring quill 40 is fixed with respect to the main body 2. This makes heavy cutting possible.

In addition, in the workpiece processing state as described above, the screw member 114 of the interlocking mechanism is pulled rearward as the connecting member 98 moves rearward.
Push rod 7, which is an input member of the eccentric shaft rotation mechanism
8 has also been moved backward accordingly, and the eccentric shaft rotation mechanism is in a non-operating state.

When it becomes necessary to correct the position of the cutting edge, the cylinder 94 is actuated by switching the electromagnetic valve mechanism, and the piston rod 96 is moved from the backward movement limit position to the forward movement in which the first limit switch 130 issues a forward movement limit signal. Advance to the limit position. When the piston rod 96 starts moving forward from the backward movement limit position, the contact plate 106 and the bottom surface of the first connecting member 100 are first separated, and the strong pressing force of the adapter 24 against the main body 2 is released, allowing relative movement. . In this case as well, the eccentric shaft 10 is returned to its original position by the biasing force of the disc spring 120 between the dividing plate 116 and the rotating plate 118, that is, the abutting plane 134 of the adapter 24 is aligned with the turret main body 2. Although it is kept in a position where it contacts the front end surface, the disc spring 12
Since the biasing force of 0 is weak, the above relative movement is not inhibited. When the piston rod 96 moves further forward, the threaded member 114 of the interlocking mechanism pushes the push rod 78 forward, causing the eccentric shaft 10 to move against the ratchet teeth 50 via the ratchet wheel 52 as described above.
The blade is rotated by one tooth, and the position of the cutting edge is corrected according to the amount of rotation.

When the above correction operation is completed and the first limit switch 130 issues a forward position limit signal, the operation of the cylinder 94 is temporarily stopped and then continues to be operated to pull the piston rod 96 back. Then, when the piston rod 96 is retreated to the above-mentioned backward movement limit position, the adapter 24 is again firmly pressed against the tool rest main body 2 and fixed.
On the other hand, the push rod 78 of the eccentric shaft rotation mechanism is similarly moved back by the biasing force of the compression coil spring 84 as the screw member 114 of the interlocking mechanism moves back.
The ratchet pawl 70 is moved to its original position on the second lid member 62 side without rotating the eccentric shaft 10 as described above.

When the above-described correction operation is repeated and the eccentric shaft 10 is rotated to the correction limit, a correction limit signal is emitted from the correction limit detection device, and based on this signal, the boring quill 40 is rotated.
Replace the chip. Note that the return of the cutting edge position to the machining start position after tip replacement is performed by manually operating the return lever 90 as described above, but this operation is performed by advancing the piston rod 96 to the forward movement limit position. In this state, that is, with the claw portion of the ratchet claw 70 separated from the ratchet teeth 50, the supply of hydraulic pressure to the cylinder 94 is cut off to remove the strong pressing force of the adapter 24 against the main body 2.

In the tool post described above, the ratchet wheel 52 is used as the eccentric shaft rotating mechanism, and the eccentric shaft 10 is rotated by one tooth of the ratchet teeth 50 by one correction operation. but,
The number of feed teeth of the ratchet teeth 50 is the same as that of the screw member 114.
A desired value can be set by changing the amount of protrusion from the bracket 112, and furthermore, it is also possible to employ an eccentric shaft rotation mechanism of another configuration that does not use the ratchet wheel 52.

Further, in the above embodiment, the contact plane 134 of the flange portion 22 of the adapter 24 was configured to directly contact the front end surface of the tool rest main body 2, but a sliding member made of synthetic resin or the like is attached to the contact plane. , the relative movement of the adapter 24 and the main body 2 in the direction perpendicular to the first center line during correction may be made smoother. In this case, the rear surface of the sliding member becomes the contact plane.

Furthermore, in the embodiment, the eccentric shaft 10 is connected to the fitting hole 1.
6, but the invention is not necessarily limited to this, and it is also possible to have a configuration in which the eccentric shaft 10 has a fitting protrusion, and to fit an adapter having a fitting hole therein.

In addition, the present invention is not limited to the above-mentioned embodiments in any way, and it goes without saying that it can be implemented with various modifications and improvements without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view showing one embodiment of a tool post according to the present invention, and FIGS. 2 and 3 are a sectional view and a sectional view, respectively, of FIG. 2: Turret body, 6: Unit case, 10:
Eccentric shaft, 16: Fitting hole, 22: Flange part (of the adapter), 24: Adapter, 34: Special bolt,
40: Boring quill, 50: Ratchet tooth,
52: ratchet wheel, 62: second lid member,
64: Claw holding member, 68: Claw guide portion (of the second lid member), 70: Ratchet pawl, 78: Push rod, 94: Cylinder, 96: Piston rod, 9
8: Connecting member, 106: Contact plate, 108: Bolt, 110: Bolt, 112: Bracket, 11
4: Screw member, 134: Contact plane.

Claims (1)

[Scope of Claims] 1. A tool rest main body to be attached to a machine tool, which is provided in the front-rear direction of the tool rest main body, is rotatably held around a first center line by the tool rest main body, and an eccentric shaft having a fitting hole or a fitting protrusion with a circular cross section centered on a second center line that is eccentric by a predetermined amount with respect to the first center side; a cutting tool holder, which has an abutment plane that can be abutted from the turret, is rotatably fitted into the fitting hole or the fitting protrusion, and is prevented from rotating relative to the tool rest main body; and an input member; an eccentric shaft rotation mechanism that rotates the eccentric shaft by a constant angle around the first center line each time the input member is moved by a predetermined amount; In the tool post with a cutting edge position correction device configured to correct the cutting edge position of the cutting tool held by the cutting tool holder in a direction perpendicular to the first center line, the tool post main body and the cutting tool holder may A piston rod is connected to the other, and movement of the piston rod in one direction strongly presses the abutment plane of the tool holder against the tool post main body, causing the tool holder and the tool post main body to separate. and a mechanical interlocking mechanism that operates an input member of the eccentric shaft rotation mechanism in conjunction with the movement of the cylinder in a direction opposite to the one direction. Turret with position correction device.