JP2889426B2 - Turret tool axis drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for rotating a tool mounted on a turret tool post of a machine tool.

[0002]

2. Description of the Related Art As a structure for driving a rotary tool mounted on a turret of a turret tool post, as shown in FIG.
The drive shaft 8 is inserted through the axis of the turning shaft 3 of the turret 1, and the tool shaft 34 mounted on the tool mounting station of the turret 1 is mounted.
A structure in which the drive shaft 8 and the drive shaft 8 are drivingly connected by bevel gears 23 and 41 is generally used.

In the case of the conventional structure shown in FIG. 3, when a plurality of tool shafts are provided on the turret 1, all the driven bevel gears 41 provided on the turret 1 simultaneously mesh with the drive bevel gear 23, and the drive shaft 8 is When driven, the plurality of rotary tools 36 mounted on the turret 1 are simultaneously driven to rotate. Accordingly, there is a large power loss when driving the rotary tool, and there is a safety problem such as the possibility that a rotary tool that is not involved in actual processing may come into contact with the human body during test processing, etc. Since the rotation of the tool shaft is free and is in a free-rotation state, there is a problem that the rotation of the tool shaft 34 must be restrained by some method when the tool 36 is attached or detached by the collet 35 or the like.

When a plurality of rotary tools 36 are mounted on the turret 1, the driven bevel gears 41 are mounted on the base ends of the respective tool shafts. However, there is a problem in that the number of rotating tools mounted is limited by interference between the driven bevel gears 41, such that only six rotating tools can be mounted at every other station. In addition, since a plurality of driven bevel gears 41 must be meshed with one drive bevel gear 23 in an accurate positional relationship, it is necessary to adjust the position of the driven bevel gears 41 of each tool shaft with a collar 42 or the like. There was also a problem that it took time to assemble.

In order to solve such a problem, as shown in FIG. 4, an intermediate drive shaft 22 held so as to always face a fixed direction in the radial direction inside the turret 1 irrespective of the turning operation of the turret 1. And the intermediate drive shaft is connected to the drive shaft 8 by a pair of bevel gears 23 and 24, and the intermediate drive shaft 22
A drive device has been proposed in which the base end of the tool shaft 34 and the front end of the intermediate drive shaft 22 that rotate coaxially with each other are engaged by a spline collar 43 or the like as necessary.

With such a structure, even when a plurality of rotary tools 36 are mounted on the turret 1, only one tool actually used for machining is driven. Problem can be avoided.

[0007]

However, in the structure shown in FIG. 4, the turret 1 has a drive mechanism for operating a spline collar 43 and other members for engaging and disengaging the intermediate drive shaft 22 and a desired tool shaft 34. It is necessary to set it up. The drive mechanism may be, for example, a method in which a cylinder is built in the turret 1 or a drive is performed by moving a rod that penetrates the center of the drive shaft 8 forward and backward. In the former case, a turning turret is used. The working fluid must be supplied, and a mechanism and a transmission method for confirming the completion of the operation by an electric signal must be provided, and in the latter case, the mechanism becomes complicated. Occurs.

In this type of structure, the rotation of the tool shaft not indexed to the machining position cannot be restricted even if the rotation of the drive shaft 8 is restricted.
When loading or unloading the tool, a rotation restraining means is provided for each of the tool shafts 34 so that the rotation of the tool 36 is restrained.
Has to be carried out.

[0009]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned problems are solved by causing the rotating tool indexed to a predetermined position and the drive shaft to be engaged and disengaged in conjunction with the turret indexing operation. I have. Inside the turret 1, a plane perpendicular to the turning axis 3 of the turret irrespective of the turning of the turret 1
In relative movement in the axial direction of the holding vital pivot 3 in the direction of a certain
The non-swirl member 21 held by the turret 1 is provided
The intermediate drive shaft 22 for driving the tool shaft is provided with the non-swirl member.
21. One end 28 of a pair of engaging elements 28 and 37 having a groove 28 in a direction orthogonal to the axis of the intermediate drive shaft 22 is provided at the tip end 25 of the intermediate drive shaft 22, and a rotary tool shaft 34 mounted on a turret is provided. The other end of the pair of engaging elements 37 is provided at the base end of the engaging element. Intermediate drive shaft 22 is controlled its stopping phase to stop facing the direction perpendicular to the pivot axis 3 of the groove 28 ye let interposed the engaging element pair 28 and 37, the intermediate driven during the stop Axis 2
A guide element 27 connected to the engagement element 28 at the tip of the second is provided on the non-slewing member 21 that supports the intermediate drive shaft 22.

[0010]

The tool shaft 34 of the rotary tool 36 mounted on the turret 1 except that the tool shaft 34 is on the extension of the distal end of the intermediate drive shaft 22 has its base engaging element 37 connected to the guide element 27 of the non-slewing member 21. The turret 1 is slidably fitted in the circumferential direction, and the rotation of each tool shaft is stopped by the non-rotating member 21.

When the turret 1 is turned while the drive shaft 8 is stopped, the engaging element 28 at the end of the intermediate drive shaft 22 is in a direction of connecting with the guide element 27 at this time. The engagement element 37 of the tool shaft 34 indexed on the extension of the tip of the intermediate drive shaft is maintained while maintaining the phase regulated by the guide element 27.
Fits. When the drive shaft 8 is rotated in this state, the drive shaft 8 rotates via the intermediate drive shaft 22 via the intermediate drive shaft 22.
Is transmitted to only one tool shaft 34 located on the extension of the tip of the rotary tool 36, so that only the rotary tool 36 indexed to the processing position is driven to rotate.

When the drive shaft 8 is stopped, the stop phase control causes the intermediate drive shaft 22 to stop in the direction in which the engagement element 28 at the tip thereof communicates with the guide element 27 of the non-swirl member. Is turned, the intermediate drive shaft 22 and the tool shaft 34 engaged therewith are disengaged by the circumferential movement of the turret 1 between the engagement elements 28 and 37, and the engagement element 37 of the tool shaft is 27, and the engagement element of the tool shaft newly indexed to the machining position engages with the engagement element 28 of the intermediate drive shaft 22.

The other tool shafts except the tool shaft 34 indexed to the machining position are prevented from rotating by the engagement between the engagement element 37 at the base end and the guide element 27 of the non-swivel member. Therefore, the tool 36 can be attached and detached by the collet 35 without providing any special rotation restraining means.

[0014]

1 and 2 show an embodiment of the present invention. The turret 1 is fixed by bolts 4 to the tip of a turning shaft 3 mounted on a tool base frame 2 so as to rotate and move slightly in the axial direction. The revolving shaft 3 is a hollow shaft, and a non-slewing shaft 6 is rotatably supported by a bearing 5 on a shaft thereof, and a driving shaft 8 of a rotary tool is relatively rotatable by a bearing 7 on a shaft of the non-slewing shaft 6. It is pivoted. Face gear joints 11 and 12 facing each other are fixed to the rear surface of the turret 1 and the front surface of the tool rest frame 2 by bolts 13 and 14, respectively. A base end (not shown) of the turning shaft 3 is drivingly connected to a turret indexing motor, and
Is connected to a clamp cylinder that moves the shaft in the axial direction. Then, while the turning shaft 3 is advanced (moved to the left in the drawing) by the clamp cylinder, the turning shaft 3 is rotated to index the turret 1, and the turning shaft 3 is retracted by the clamp cylinder to mesh the surface gear joints 11, 12. By doing so, the indexing position of the turret 1 is fixed.

A rear end (not shown) of the non-rotating shaft 6 is connected to the tool rest frame 2 by a spline or the like so as to be relatively non-rotatable and relatively movable in the axial direction by a small distance. The drive shaft is connected to a tool drive motor mounted on the tool rest frame 2, and a motor capable of controlling the phase of the stop position is used as the tool drive motor.

An inner frame 21 is fixed to the tip of the non-swivel shaft 6. The inner frame 21 has a ring shape, and supports the intermediate drive shaft 22 in a diameter direction thereof, that is, in a direction orthogonal to the axis of the turning shaft 3. A drive bevel gear 23 fixed to the tip of the drive shaft 8 and a driven bevel gear 24 fixed to the intermediate drive shaft 22 mesh with each other. The tip 25 of the intermediate drive shaft 22 is
Through the through hole 26 provided at the outer periphery of the inner frame 21. A circumferential guide groove 27 is provided on the outer periphery of the inner frame 21 at a position coinciding with the axis of the intermediate drive shaft 22, while a front end of the intermediate drive shaft 22 has an engagement groove The guide groove 27 and the engagement groove 28 are formed such that a single continuous circumferential groove is formed when the engagement groove 28 faces in a direction orthogonal to the turning shaft 3. Is done.

The rotary tool holder 31 mounted on the tool mounting station of the turret 1 has bearings 32, 33.
, A tool shaft 34 is rotatably mounted, and a collet 35 is provided at the tip of the tool shaft. The rotating tool 36 is fixed to the rotating tool shaft 34 by the collet 35. At the base end of the tool shaft 34, a projection 37 is provided in a direction perpendicular to the axis.
Reference numeral 7 denotes a shape which slidably fits the guide groove 27 and the engagement groove 28 in the circumferential direction of the turret 1.

The rotary tool 36 in the embodiment described above.
The operation at the time of indexing has been described in the section of the operation, and therefore will not be described here.

[0019]

According to the apparatus of the present invention described above,
Since only one rotary tool directed to the processing position is driven, power loss at the time of driving the rotary tool is small, and danger caused by rotation of a tool that is not actually being processed can be avoided. In addition, since the driven bevel gear is not mounted on the base end of the tool shaft, it is possible to mount a rotary tool on all of the multiple tool stations, and a rotary tool other than the rotary tool oriented in the processing direction is guided by a guide element. Since the rotation is locked, there is no need to fix the tool shafts one by one at the time of tool change. Furthermore, since the desired rotary tool and the drive shaft are engaged and disengaged only by the indexing operation of the turret, the operation is quick and reliable, and the internal structure of the turret is simpler than that of the same type of device, and the assembly and maintenance are easy. There is a feature that there is.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment.

FIG. 2 is a sectional view of the embodiment.

FIG. 3 is a sectional view showing a first conventional example.

FIG. 4 is a sectional view showing a second conventional example.

[Explanation of symbols]

 1 Turret 3 Rotating shaft 21 Inner frame 22 Intermediate drive member 27 Guide groove 28 Engagement groove 34 Tool shaft 37 Projection

Claims (1)

(57) [Claims] An intermediate drive shaft (22) is engaged with a rotary tool shaft (34) indexed on an extension of a tip of an intermediate drive shaft (22) provided inside a turret (1). In the turret tool axis drive for driving the tool axis (34), the intermediate drive shaft (22) is driven independently of the turning of the turret (1).
The direction in the plane perpendicular to the axis of rotation of the
One turret (1) so that it cannot move relatively in the direction of its pivot axis
One of a pair of engagement elements (28), (37), which is supported by the pivoted non-rotating member (21) and has a groove in a direction perpendicular to the axis at the front end of the intermediate drive shaft. The intermediate drive shaft (22) is connected to the engagement element pair (2
8), are controlled its stopping phase to stop facing the direction orthogonal to the groove backlash let the pivot axis (3) of (37),
At the time of the stop, a guide element (27) connected to the engagement element (28) at the tip of the intermediate drive shaft (22) is provided integrally with the non-slewing member (21) that supports the intermediate drive shaft (22), and a turret. At the base end of the rotary tool shaft (34) mounted on the other end, there is provided another engagement element (37) that engages with the engagement element (28) at the distal end of the intermediate drive shaft (22). A turret tool axis drive.