JP3361630B2 - Intermittent indexing device and tool indexing machine for machine tools - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool indexing machine for turret lathes and other machine tools, and an intermittent indexing apparatus suitable for use in the tool indexing machine.

[0002]

2. Description of the Related Art Conventionally, for example, a turret lathe or the like is provided with a large number of blades necessary for machining in advance, which are attached to an indexing machine, and the machining is carried out by appropriately rotating the blade indexing machine. It is known that the tool is positioned at the work processing position to perform the required processing, and in such a tool indexing machine, various tools mounted on the peripheral portion of the rotary table are positioned at the work processing position. There is an intermittent indexing mechanism that uses a globoidal cam.

Generally, the intermittent indexing mechanism using the globoidal cam fixes a plurality of cam followers radially at appropriate intervals on the outer peripheral side of a turret integrally attached to the output shaft, and the cam follower is used as the input shaft. It is engaged with the taper rib of the globoidal cam integrally attached to the. At this time, two adjacent cam followers hold the left and right side surfaces of the taper rib, and the globoidal cam and the cam follower are configured as a positive cam having no backlash between them.

The taper rib of the globoidal cam has an index section where an axial displacement is given according to the rotation angle of the input shaft, and a stay (dwell) where no axial displacement is given to the rotation of the input shaft. ) And has a desired cam profile shape. When the cam follower is engaged in the indexing section, the output shaft is rotated by a predetermined angle according to the rotation of the input shaft to position the blade, and when the cam follower is engaged in the retention section, the input shaft is rotated. Despite the rotation, the output shaft is not rotated and the desired blade is held in a predetermined position. That is, when the cam follower is engaged with the staying section, the output shaft can be firmly positioned and fixed at a predetermined position.

Further, the input shaft is driven by a rotation control motor, and during processing, the rotation control motor is stopped while the taper rib and the cam follower are engaged in the retention section. ing.

[0006]

However, the retention section is formed in the taper rib of the globoidal cam in this way, and the desired blade is firmly held at the workpiece machining position while the cam follower is engaged with the retention section. With the blade indexing machine, the excessive load of the output shaft will be applied if an excessive load such as impact force is applied to the output shaft for some reason while the cam follower is engaged in the staying section. There is a risk of acting as an excessive load on the main bearing portion and the engaging portion of the taper rib and the cam follower, and damaging these members, or causing damage such as permanent distortion such as indentation or bending. If such permanent distortion is caused, there is a problem that the accuracy of the blade indexing machine is lowered.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent damage to the engagement portion between the taper rib and the cam follower and the main bearing portion even if an excessive load is applied to the output shaft. An object of the present invention is to provide an intermittent indexing device having high rigidity and durability that does not occur, and a tool indexing machine for a machine tool using the intermittent indexing device.

[0008]

In order to achieve the above object, in an intermittent indexing device according to the present invention, an input shaft rotatably supported by a housing and a globoidal cam integrally attached to the input shaft. A cam follower engaged with the taper rib of the globoidal cam, a plurality of turrets radially provided with the cam follower at predetermined intervals, and the turret integrally attached to rotate the shaft on the housing. comprising a supporting output shaft, a clamping device for restraining the outer peripheral portion of the output shaft during dwell of the output shaft is attached to the housing from the side, and the class
The pump device has an annular hydraulic chamber and is supplied to the hydraulic chamber.
The outer surface of the output shaft is pressed from the outside by the high pressure
Hydraulically actuated clamp means for restraining the
Hydraulic oil supply / discharge means for supplying / discharging high-pressure hydraulic oil,
The hydraulic oil supply / discharge means is located on the input shaft that is exposed from the housing.
Hydraulic cylinder driven by attached cam plate
Made in, characterized in that.

Further, in order to achieve the above object, in a tool indexing machine for a machine tool according to the present invention, a housing provided on a base of the machine tool so as to be horizontally movable in the front-back and left-right directions, and the housing. An input shaft rotatably supported, a globoidal cam integrally attached to the input shaft, a cam follower engaged with a taper rib of the globoidal cam, and a plurality of the cam followers radially with a predetermined interval. A turret provided, an output shaft to which the turret is integrally attached and which is rotatably supported in the housing, and an outer peripheral portion of the output shaft which is attached to the housing and laterally extends when the output shaft is stationary. A clamp device that is restrained from the rotary shaft, and a rotary disk attached to the shaft end of the output shaft,
A plurality of blades held on the peripheral portion of the turntable ,
The clamp device has an annular hydraulic chamber and is provided in the hydraulic chamber.
Whether the outer peripheral surface of the output shaft is outside due to the high pressure supplied
Hydraulically operated clamp means for pressing and restraining
It consists of hydraulic oil supply / discharge means for supplying / discharging high pressure hydraulic oil to / from the pressure chamber.
The operating oil supply / discharge means is exposed from the housing
Hydraulic system driven by a cam plate attached to the part
It is made of Linda .

[0010]

According to the intermittent indexing device of the present invention and the tool indexing machine of the machine tool provided with this intermittent indexing device according to the above-described structure, in the section where the cam follower is engaged with the retention section of the taper rib, Since the clamp device laterally constrains the outer periphery of the output shaft and holds it firmly with high rigidity, due to some cause during this holding, for example, an impact load is applied to the blade, the output shaft is Even if an excessive moment force about the axis, bending force, or shear force is applied, these moment force around the axis, bending force, and shear force are received by the clamp device and distributed to the housing side for transmission. To be done. The cam plate of the hydraulic oil supply / discharge means is attached to the output shaft.
Operate the hydraulic cylinders in synchronization, and
Starts compression from the beginning and reaches the maximum compression point in a predetermined section
After maintaining this state, it begins to expand, and the end of the retention section
Return to maximum expansion point.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 2 is a base of the machine tool 1, and a work mounting chuck 4 is mounted on the base 2.
A center 6, and a blade indexing board 8 are attached.

The blade indexing board 8 is provided so as to be horizontally movable with respect to the base 2 in the front-rear and left-right directions, and has two moving tables 10 and 12. One moving table 10 is provided on the base 2 so as to be slidable in the front-rear direction along the axial direction of the chuck 4 and the center 6.
Well-known feed screw mechanism 1 supported and provided on the base 2 side
The drive control is performed at 4. A movement control motor 16 is attached to the feed screw mechanism 14.

The other moving table 12 is provided on the one moving table 10 and is movable in the left-right direction orthogonal to the moving direction of the one moving table 10.
Similarly, it is driven and controlled by a feed screw mechanism 20 having a movement control motor 18.

On the other moving table 12, the housing 2 of the intermittent indexing device 21 which is a main part of the blade indexing machine 8.
2 is fixed and the housing 22 has an input shaft 2
4 and the output shaft 26 intersect each other at a right angle and are rotatably supported. A rotation control motor 28 is connected to the input shaft 24, and the motor 28 is fixed to the outside of the housing 22. On the other hand, the output shaft 26 has a turntable 30.
A variety of blades 32 are removably attached to the peripheral edge of the rotary disk 30 via a holder 34 in a radial pattern at predetermined intervals.

3 to 6 show the intermittent indexing device 21. As shown in the figure, a globoidal cam 36 is provided integrally with the input shaft 24 in the housing 22 of the intermittent indexing device 21, and a cam follower 40 is engaged with a taper rib 38 of the globoidal cam 36. Has been done. A plurality of the cam followers 40 are provided radially on the outer peripheral surface of the turret 42 integrally attached to the output shaft 26 with a predetermined gap therebetween, and the taper rib 38 is formed between the two adjacent cam followers 40.
It is designed to hold both sides of the.

The taper rib 38 is formed in a spiral shape having an index section and a retention section. In the retention section, the taper rib 38 is not displaced in the axial direction according to the rotation angle of the input shaft 24. Therefore, when the cam follower 40 is engaged with the taper rib 38 in the retention section, Even if the input shaft 24 rotates, the output shaft 26 does not rotate and stays there. That is, in this staying section, the blade 32 attached to the output shaft 26 of the intermittent indexing device 21 via the turntable 30.
Are held at the same position and are stagnant.

In the indexing section, the taper rib 38 is given a displacement in the axial direction of the input shaft 24 according to the rotation angle of the input shaft 24, and the cam follower 40 is engaged in this indexing section. When the input shaft 24 is rotating, the output shaft 26 is rotated by a predetermined angle according to the rotation angle of the input shaft 24. That is, according to the number of rotations of the input shaft 24, the desired blade 32 attached to the turntable 30 is newly positioned and fixed at the work processing position.

By the way, the intermittent indexing device 21 is capable of appropriately engaging the outer peripheral portion of the output shaft 24 from the side and firmly clamping and holding the output shaft 24.
Is equipped with. The clamp device 45 includes a clamp means 47 which is attached to the housing 22 of the intermittent indexing device 21 and restrains the outer peripheral portion of the output shaft 24, and a clamp operating means 49 which operates the clamp means 47.

In the illustrated embodiment, the clamp device 45 is hydraulically operated. That is, the clamp means 47 defines a support frame 51 that surrounds the outer peripheral side of the output shaft 26 in an annular shape at a predetermined interval, and an annular hydraulic chamber 53 that is attached along the inner peripheral portion of the support frame 51. And a clamp member 55 formed. The support frame 51 is the output shaft 26.
Are laid side by side with a main bearing 27 that rotatably supports and are fastened and fixed to the outside of the housing 22 with bolts.

The clamp member 55 has a substantially U-shaped cross-section with its outer peripheral side open in an annular shape, and both side surfaces 5 of the U-shape.
A flange portion formed at the edge of 5a is hermetically joined to the inner peripheral surface of the support frame 51 to define a hydraulic chamber 53. Further, in order to facilitate the bulging of the inner peripheral surface 55b of the clamp member 55 inward in the radial direction, folds 55c for imparting flexibility are formed on both side surfaces 55a thereof.
The clamp member 55 is preferably formed of a thin plate made of metal such as iron, but it is also possible to use resin.

In other words, the clamp means 47 has an inner peripheral surface 55 of the clamp member 55 when a high pressure is applied to the hydraulic chamber 53.
b bulges inward in the radial direction, presses the outer peripheral surface of the output shaft 26 from the outer periphery and restrains it, and when high pressure is not applied to the hydraulic chamber 53, the clamp member 55 is provided. The inner peripheral surface 55b and the outer peripheral surface of the output shaft 26 are set to have a clearance of a few tens of μm.

An oil hole 51a for connecting and disconnecting the outer peripheral surface and the inner peripheral surface of the support frame 51 to supply and discharge the hydraulic oil into the hydraulic chamber 53 is formed through.

The clamp operating means 49 is constituted as an oil supply / discharge means 57 for supplying / discharging the hydraulic oil into / from the hydraulic chamber 53. The oil supply / drainage means 57 has an oil supply / drain pipe 59 whose one end is connected to the oil hole 51a. A three-way solenoid valve 61 is provided at the other end of the oil supply / discharge pipe, and the oil supply / discharge pipe 59 is appropriately connected to the supply pipe 63 and the discharge pipe 65 via the three-way solenoid valve 61. Has become. A hydraulic pump 67 is provided on the supply pipe 63 side, and the hydraulic pump 67 discharges the hydraulic oil in the hydraulic oil storage tank 69 toward the hydraulic chamber 53, and the discharge pressure thereof is set to a desired value by the pressure adjusting device 71. It is adjustable to. Further, the discharge pipe 65 returns the working oil into the tank 69.

The operations of the hydraulic pump 67 and the three-way solenoid valve 61 are controlled based on the rotation signal of the input shaft 24. That is, as shown in FIG. 6, the hydraulic pump 67 is driven within the rotation angle range of the input shaft 24 corresponding to the retention section A where the rotation of the output shaft 24 stops.
The drive is stopped in the rotation angle range of the input shaft 24 corresponding to the indexing section B in which the output shaft 26 is rotating. Also,
The three-way solenoid valve 61 is also operated in synchronism with the driving of the hydraulic pump 67, and connects the oil supply / discharge pipe 59 to the supply pipe 63 side while the hydraulic pump is driven, and connects it to the discharge pipe 65 side while the drive is stopped. The rotation signal of the input shaft 24 can be taken out by using an appropriate means such as a timing cam or a limit switch.

Therefore, the intermittent indexing device 21 as described above is used.
In the tool indexing machine 8 of the machine tool including the above, when the cam follower 40 is engaged with the indexing section of the taper rib 38, the output shaft 26 is rotated by a predetermined angle by the rotation of the input shaft 24. Then, when the engagement between the cam follower 40 and the taper rib 38 shifts to the staying section, the rotation of the output shaft 26 stops regardless of the rotation of the input shaft 24, and the predetermined blade 32 is positioned at the workpiece machining position. Retained. If the holding time at this position is desired to be long, the rotation of the input shaft 24 may be stopped while the cam follower 40 is engaged with the retention section of the taper rib 38. Further, by controlling the rotation speed of the input shaft 24, the desired blade 32 can be positioned and fixed at the work processing position.

By the way, in the staying section B, the hydraulic pump 67 is driven, the three-way solenoid valve 61 connects the oil supply / exhaust pipe 59 to the supply pipe 63 side, and the pressure adjusting means 71 is provided in the hydraulic chamber 53 for a predetermined amount. High hydraulic pressure regulated to the pressure is applied. Therefore, the clamp member 55 has the inner peripheral surface 5
5b bulges inward in the radial direction, presses and restrains the outer peripheral side of the output shaft 26, and holds it firmly with high rigidity.

Therefore, during this holding, due to some cause, for example, an impact load is applied to the cutting tool, and the output shaft 26 receives an excessive moment force about the shaft, a bending force, a shearing force, or the like, which is larger than the normal time. Even when applied, the moment force, bending force, and shearing force around these axes are clamped by the clamping means 47.
And is distributed to and transmitted to the housing 22 side, and the moment force and bending force about the excessive shaft rotation are applied to the main bearing 27 portion, the engagement portion between the cam follower 40 and the taper rib 38, and the like. Direct action of shear forces is prevented.

Therefore, it becomes possible to prevent the damage of those members and the damage such that the permanent set remains. As a result, the rigidity and durability of the blade indexing board 8 provided with this intermittent indexing device 21 can be improved as much as possible.

8 to 11 show another embodiment of the intermittent indexing device.

This intermittent indexing device 21A differs from the above-mentioned one in that the hydraulic oil supply / discharge means 57 of the clamp device 45 is different.
Since the other parts are the same as those described above, the same members are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, this hydraulic oil supply / discharge means 57
A is a hydraulic cylinder 75 driven by a cam plate 73 attached to a portion of the input shaft 26 exposed from the housing 22. The cylinder body 77 is fixed to the housing 22, and the roller follower 81 attached to the lower end of the piston 79 is in contact with and engaged with the peripheral side surface of the cam plate 73.

As shown in FIG. 12, the cam plate 73 synchronizes with the retention section A of the output shaft 26 and pushes up the piston 79 during the retention section A to compress the working oil. That is, the hydraulic cylinder 75 starts to be compressed at the beginning of the retention section A of the output shaft 26, and when it reaches the maximum compression point, this state is maintained for a predetermined section and then begins to expand, and reaches the maximum expansion point at the end of the retention section A. It is supposed to come back.

The oil supply / drain pipe 59 is connected to the working chamber 83 of the hydraulic cylinder 75, and the working chamber 83 is connected to the working chamber 83 to regulate the maximum pressure to a predetermined value.
5 is also provided.

In the present invention, the clamp members are not limited to those described above. For example, hydraulic cylinders may be adopted and a suitable number of them may be arranged along the circumferential direction of the support frame. Is also good.

[0036]

As described in detail in the above embodiments, according to the intermittent indexing device according to the present invention, and the tool indexing machine for machine tools equipped with this intermittent indexing device, the cam follower has a tapered rib. In the section engaged with the stay section, the cam plate of the hydraulic oil supply / discharge means synchronizes the hydraulic pressure with the output shaft.
Operate the cylinder and compress from the beginning of the retention section of the output shaft
When the maximum compression point is reached, this state is maintained for a predetermined period.
The clamp device holds the outer peripheral portion of the output shaft from the side and firmly holds it with high rigidity.Therefore, for some reason during this holding, for example, an impact load is applied to the blade, and the output shaft is Even if an excessive moment force around the axis, bending force, or shearing force is applied to the housing, these clamping moment force, bending force, and shearing force are received by the clamp device and distributed to the housing side. It is possible to prevent the excessive moment force, bending force, and shearing force around the shaft from directly acting on the main bearing portion of the output shaft, the engagement portion between the cam follower and the taper rib, or the like. Therefore, it is possible to prevent the members from being damaged or being damaged such that the permanent set remains, and the rigidity and durability of the device can be improved as much as possible.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a tool indexing machine of a machine tool according to the present invention.

FIG. 2 is a right side view of FIG.

3 is a diagram showing a schematic configuration of an intermittent indexing device incorporated in the blade indexing machine of FIG.

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

5 is a sectional view taken along the line VV in FIG.

6A and 6B are enlarged views of a main part of FIG. 5, where FIG. 6A shows a state during unclamping, and FIG. 6B shows a state during clamping.

FIG. 7 is a timing chart showing the relationship between the rotation angle of the output shaft with respect to the rotation angle of the input shaft, the operating state of the hydraulic pump, and the switching state of the three-way solenoid valve.

FIG. 8 is a view showing another embodiment of the intermittent indexing device.

9 is a left side view of FIG. 8, where FIG. 9 (A) shows a clamped state of the output shaft, and FIG. 9 (B) shows an unclamped state.

FIG. 10 is an enlarged view of a hydraulic cylinder portion in FIG. 9 (B).

FIG. 11 is an enlarged view of a hydraulic cylinder portion in FIG.

FIG. 12 is a timing chart showing the relationship between the rotation of the output shaft and the operating state of the hydraulic cylinder with respect to the rotation angle of the input shaft.

[Explanation of symbols]

8 blade splitting machine 21 Intermittent cutting device 22 housing 24 input axis 26 Output shaft 30 turntable 32 cutlery 36 Globoidal Cam 38 Taper rib 40 cam followers 42 Turret 45 Clamp device 47 Clamping means 49 Clamp operating means 57, 57A hydraulic oil supply / discharge means

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23B 29/32 B23Q 16/02

Claims (2)

(57) [Claims] 1. An input shaft rotatably supported by a housing, a globoidal cam integrally attached to the input shaft, a cam follower engaged with a taper rib of the globoidal cam, and a predetermined cam follower. A plurality of turrets radially provided at intervals, an output shaft rotatably supported on the housing by integrally mounting the turrets, and an output shaft mounted on the housing when the output shaft is stationary. A clamp device for laterally restraining the outer peripheral portion of the shaft ; and the clamp device having an annular hydraulic chamber
Whether the outer peripheral surface of the output shaft is outside due to the high pressure supplied
Hydraulically operated clamp means for pressing and restraining
It consists of hydraulic oil supply / discharge means for supplying / discharging high pressure hydraulic oil to / from the pressure chamber.
The hydraulic oil supply / discharge means is an input shaft portion exposed from the housing.
Hydraulic cylinder driven by a cam plate attached to
An intermittent indexing device characterized by consisting of da . 2. A housing provided on a base of a machine tool so as to be horizontally movable back and forth and left and right, an input shaft rotatably supported by the housing, and integrally attached to the input shaft. A globoidal cam, a cam follower engaged with a taper rib of the globoidal cam, a plurality of turrets radially provided with the cam followers at predetermined intervals, and the turret being integrally attached and rotatable in the housing. An output shaft rotatably supported on the housing, a clamp device attached to the housing for laterally restraining the outer peripheral portion of the output shaft when the output shaft is stationary, and a turntable mounted on the shaft end of the output shaft. And a plurality of blades held on a peripheral portion of the turntable , the clamp device having an annular hydraulic chamber
Whether the outer peripheral surface of the output shaft is outside due to the high pressure supplied
Hydraulically operated clamp means for pressing and restraining
It consists of hydraulic oil supply / discharge means for supplying / discharging high pressure hydraulic oil to / from the pressure chamber.
The hydraulic oil supply / discharge means is an input shaft portion exposed from the housing.
Hydraulic cylinder driven by a cam plate attached to
A blade indexing machine for machine tools that is characterized by consisting of da .