JPH0551513U - Lathe turret device - Google Patents

Abstract

(57) [Summary] [Purpose] Indexing can be performed without performing clamping / unclamping operations, which shortens the indexing time and has a simple configuration.
To enable smooth engagement and disengagement of the input bevel gear and the drive bevel gear on the rotary tool side. [Structure] The turret 1 includes a rotating turret portion 2 and a stationary turret portion 3. The rotary tool 4 having the input bevel gear 13 is attached to the rotary turret portion 2.
Drives the rotation of the tool drive shaft 9 around the turret shaft Bevel gear 1
Rotation transmission device 12 for transmitting from 9 to the input bevel gear 13
On the fixed side turret portion 3. Drive bevel gear 1
9 is movable forward and backward, and an end face cam 24 for engaging and disengaging the drive bevel gear 19 with the input bevel gear 13 is formed in the rotation side turret portion 2 in accordance with the rotation thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a turret device for a lathe equipped with a rotary tool.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, as a turret device for a lathe, there has been one in which a rotary tool of each part of the turret is driven by a single tool drive shaft having a turret shaft center.

FIG. 4 shows an example thereof. The turret 41 is composed of a rotating turret portion 42 and a fixed turret portion 43. A rotating tool 44 such as a drill or a milling cutter and a fixed tool such as a bite (not shown) are provided on the outer peripheral surface of the rotating turret portion 42. And are installed. The rotating side turret portion 42 is fixed to the tip of a turret shaft 46 supported by a housing 45 of the turret carriage, and performs indexing rotation and forward / backward movement of the turret shaft 46 together with the turret shaft 46. An interlocking coupling 47 is provided between the rotation-side turret portion 42 and the housing 45, and the coupling 47 is engaged and disengaged by the forward and backward movement of the rotation-side turret portion 42. By this engagement, the rotation-side turret portion 42 is clamped to the housing 45, and the supporting rigidity is secured.

The turret shaft 46 is composed of a hollow shaft, and a tool driving shaft 48 is inserted therein, and a coolant pipe 49 is further inserted therein. The coolant pipe 49 is fixed to the housing 45 at the rear part, and the fixed side turret portion 43 is supported by the bearing 50 on the outer periphery of the tool rotation shaft 48 and is joined to the tip end of the coolant pipe 49 and held non-rotatably. To be done.

The rotary tool 44 is driven by the input bevel gear 51 to rotate the tool bit 44 a, and the input bevel gear 51 meshes with the drive bevel gear 53 of the rotation transmission mechanism 52 provided in the fixed side turret portion 43. .. The rotation transmission mechanism 52 is composed of a gear train that transmits the rotation of the outer peripheral gear 54 of the tool rotation shaft 48 to the drive bevel gear 53.

In this turret device, each rotary tool 44 moves the rotary turret portion 42 in the axial direction (direction of arrow Q) for clamping the coupling 47 after index rotary of the rotary turret portion 42. By doing so, the rotation of the tool rotary shaft 49 can be transmitted by meshing with the input gear 53. In this way, each rotating tool 44 is driven by one tool rotating shaft 49.

[0007]

[Problems to be solved by the device]

 In this type of turret device, the time required for clamping / unclamping the coupling 47 occupies most of the indexing time of the turret 41 and limits the improvement of cycle time. Therefore, if this clamp / unclamp is eliminated, the time can be considerably shortened. Depending on the indexing and rotating mechanism of the turret 41, it is possible to secure the supporting rigidity without the need for a clamp.

However, in the case of using the rotary tool 44, the engagement of the input bevel gear 51 and the drive bevel gear 53 is disengaged by utilizing the axial movement of the coupling 47 for clamping and unclamping. Without the clamp operation, the bevel gears 51 and 53 cannot be smoothly engaged and disengaged. If the bevel gears 51 and 53 are engaged and disengaged simply by performing indexing rotation, the bevel gears 51 and 53 may be damaged by collision with each other during turret rotation. It is possible to provide a dedicated engagement and disengagement drive source to smoothly engage and disengage the bevel gears 51 and 53, but in that case, the addition of the drive source complicates the configuration and control.

The object of the present invention is to perform indexing without performing clamping / unclamping operation, which can shorten the indexing time, and has a simple structure, which enables the input bevel gear on the rotary tool side and the rotary transmission device side. To provide a turret device for a lathe that can be smoothly engaged with and disengaged from a driving bevel gear.

[0010]

[Means for Solving the Problems]

 This invention is a turret device in which a rotary tool having an input bevel gear is attached to a rotation side turret portion, and a rotation transmission mechanism for transmitting the rotation of a tool drive shaft of a turret shaft center from a drive bevel gear to the input bevel gear is provided in a fixed side turret portion. In the above, a cam for engaging and disengaging the drive bevel gear with the input bevel gear as the rotation side turret part rotates is formed in the rotation side turret part.

[0011]

[Action]

 According to this configuration, by rotating the rotary turret portion so that the rotary tool comes to the processing position, the drive bevel gear is guided by the cam in accordance with the index rotation, and the drive bevel gear has the input bevel gear of the rotary tool at the index position. Is engaged with. When the rotating turret part is rotated for indexing another tool, the engagement of both bevel gears is released by the action of the cam. In this way, the tool is indexed without performing the clamping / unclamping operation, and the input bevel gear and the drive bevel gear of the rotary tool are disengaged with the indexing rotation.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. The turret 1 is composed of a rotating side turret portion 2 and a fixed side turret portion 3 each having a polygonal regular surface. A rotary tool 4 and a fixed tool 5 such as a bite are attached. The rotation side turret part 2 is fixed to the tip of a turret shaft 6, and the turret shaft 6 is rotatably installed on a turret carriage 7 moving forward and backward on a bed (not shown), and indexed by an indexing / rotating device 8. Is rotated.

The turret shaft 6 is a hollow shaft, a tool drive shaft 9 is inserted therein, and a coolant pipe 10 is inserted therein. The tool drive shaft 9 is rotationally driven by a motor (not shown) mounted on the rear portion of the turret carriage 7, and the coolant pipe 10 is fixed to the turret carriage 7 at the rear end. The fixed-side turret portion 3 is relatively rotatably supported by a bearing 11 on the outer periphery of the tool drive shaft 9, and is joined to the tip of the coolant pipe 10 to stop rotation. The fixed turret portion 3 is provided with a rotation transmission mechanism 12 that transmits the rotation of the tool drive shaft 9 to the rotary tool 4 at a predetermined indexing position.

The rotary tool 4 is driven by the input bevel gear 13 to rotate the tool bit 4 a, and the input bevel gear 13 is inserted into the inside of the rotation-side turret portion 2 through the window 14 of the outer peripheral wall. A bearing 15 that supports the rotating shaft of the input bevel gear 13 is installed in the window 14.

The rotation transmission device 12 includes a gear train including an outer peripheral gear 16 provided on the outer periphery of the tool drive shaft 9, intermediate gears 17 and 18, and a drive bevel gear 19. The drive bevel gear 19 is axially movably coupled by a spline shaft 21 into a hollow transmission shaft 20 having an intermediate gear 18 fixed to the outer periphery, and is engaged by a spring member 22 on the projecting side, that is, the input bevel gear 13. Biased in the direction.

The drive bevel gear 19 is disengaged and moved by the cam mechanism 23 as the rotation-side turret portion 2 rotates. That is, the end face cam 24 is formed in an annular shape around the rotation axis in the intermediate diameter portion of the front surface of the rotating side turret portion 2, and the cam follower 25 contacting the cam 24 is provided in the fixed side turret portion 3 by the guide hole 26. It is supported so that it can move back and forth in any direction. The cam follower 25 has an engaging piece 28 that engages with the collar portion 27 of the spline shaft 21 of the drive bevel gear 19, and is pressed against the cam 24 by the biasing force of the spring member 22 that biases the spline shaft 21. Be done.

The cam surface of the cam 24 has a trough 24a corresponding to each tool station of the turret 1 as shown in the developed view of FIG. The trough portion 24a to be mounted is filled with the filling member 29. In this embodiment, the filling member 29 is integrally attached to the fixed tool 5, and the filling member 29 is attached / detached as the fixing tool 5 is attached / detached to / from the turret 1.

FIG. 3 shows the indexing and rotating device 8 of the turret 1. The indexing / rotating device 8 is composed of a plurality of cam followers 30 radially mounted on the outer periphery of the turret shaft 4 in correspondence with each tool station of the turret 1, and a roller gear cam 31 mounted on the turret carriage 7 and rotationally driven. Become. Each cam follower 30 meshes with the taper rib 31a formed on the roller gear cam 31 by two cam followers 30, and is received with high rigidity without positive or negative backlash.

The operation of the above configuration will be described. The indexing of the turret 1 is performed only by rotating the rotating turret portion 2, and the advancing / retreating operation for conventional clamping / unclamping is not performed. Therefore, the indexing time is shortened and the processing cycle time can be improved. Even if the rotation-side turret portion 2 is not clamped, a roller gear cam type is used as the indexing / rotating device 8, so that high supporting rigidity can be obtained and processing accuracy can be secured.

Although the rotation-side turret portion 2 for clamping is not moved in the axial direction, according to this turret device, the engagement of the drive bevel gear 19 with respect to the rotary tool 4 as the turret 1 rotates is as follows. Removal is performed.

That is, when the rotating turret portion 2 is at the indexed rotation angle of the rotary tool 4, the cam follower 25 of the cam mechanism 23 fits into the valley 24 a (FIG. 2) of the cam 24, and the drive bevel gear Reference numeral 19 is in a state of meshing with the input bevel gear 13 of the rotary tool 4. Therefore, the rotation of the tool drive shaft 9 is transmitted from the drive bevel gear 19 to the rotary tool 4 via the gears 16 to 18 of the rotation transmission device 12.

When the rotating turret portion 2 is rotated for indexing another tool, the cam follower 25 comes out of the valley portion 24a of the cam 24, and the driving bevel gear 19 is retracted by the engaging piece 28 so that the input bevel gear is retracted. Remove from 13. When the rotary tool 4 again reaches the indexing position, the cam follower 25 fits into the valley 24a of the cam 24, and the bevel gears 13 and 19 mesh with each other. At the indexing angle of the fixed tool 5, the drive bevel gear 19 is held in the disengaged position with respect to the input bevel gear 13 because the valley 24a is filled with the filling member 29.

In this turret device, since the turret 1 is rotated while the bevel gears 13 and 19 are disengaged from each other in this manner, the bevel gears 13 and 19 can be smoothly rotated without being damaged. .. Moreover, since the engagement and disengagement is performed as the turret 1 rotates, a dedicated drive source for engagement and disengagement is unnecessary, and the structure and control are simple.

Although the trough portion 24a of the cam 24 is filled with the filling member 29 integrated with the fixed tool 5 in the above embodiment, an independent filling member may be used. Further, when the installation station of the fixed tool 5 is fixedly determined, the cam 24 may be formed in advance so that the valley portion 24a does not occur at that location. Further, in the above-described embodiment, the rotary indexing mechanism 8 is of the roller gear cam type, but other types of indexing rotary devices may be employed.

[0025]

[Effect of the device]

 In the turret device of the present invention, a cam for engaging and disengaging the drive bevel gear of the fixed side turret part with the input bevel gear of the rotary tool as the rotation side turret part rotates is formed in the rotation side turret part. The bevel gear that transmits the drive force to the rotary tool can be smoothly engaged and disengaged with a simple mechanism, and damage to the bevel gear can be prevented while the indexing time is shortened without performing any operation.

[Brief description of drawings]

FIG. 1 is a cutaway plan view of an embodiment of the present invention.

FIG. 2 is an explanatory view showing a cross section of a developed state of the cam.

FIG. 3 is a sectional view showing the rotary indexing device.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... Turret, 2 ... Rotation side turret part, 3 ... Fixed side turret part, 4 ... Rotating tool, 5 ... Fixed tool, 6 ... Tool drive shaft, 8 ... Indexing rotary device, 9 ... Tool drive shaft, 10 ... Coolant Pipe, 12 ... Rotation transmission device, 13 ... Input bevel gear, 19 ... Drive bevel gear, 21 ... Spline shaft, 2
2 ... Spring member, 23 ... Cam mechanism, 24 ... Cam, 24a ...
Valley, 25 ... Cam follower, 29 ... Filling member

Claims (1)

[Scope of utility model registration request] 1. A rotating tool having an input bevel gear is attached to a rotating turret portion, and a rotation transmitting mechanism for transmitting the rotation of a tool drive shaft having a turret shaft center from a drive bevel gear to the input bevel gear is provided in the fixed turret portion. A turret device for a lathe, wherein a cam for engaging and disengaging the drive bevel gear with respect to the input bevel gear as the rotation-side turret portion is formed is formed in the rotation-side turret portion.