JPH0329049Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention includes a tool holding means mounted on the turret, which is integrated with a rotating tool and a turning tool that are immovably fixed on the turret, which is a tool supporting member, and can automatically attach and detach the rotating tool. This relates to a tool support member for an NC lathe.

Conventionally, in most NC lathes, a rotating tool such as a milling cutter or drill is mounted on a turret to machine the workpiece, but since the rotating tool is immovably fixed directly to the turret, it can be used for a wide variety of hole machining or When milling or the like is performed, a tool suitable for the machining must be replaced each time, and changing tool setups reduces cycle time and is a factor in lowering productivity. Tool changeover can be solved by equipping an automatic tool change function, but if a large number of tools are stored in a tool stocker or magazine and multiple tools on the turret are to be changed, the machining The time taken up by tool exchange increases relative to time,
Furthermore, there may be cases where the high economic expense invested in adding a tool exchange function cannot be absorbed by the machining costs. A tool indexable turret is a system in which multiple tools necessary for the machining process are set in advance, selected at will, and brought to the machining area. The response is extremely fast. Therefore, among the rotary tools that should be mounted on this turret, rotary tools whose machining process rarely changes are fixed immovably, and rotary tools with a small diameter and easily damaged, or rotary tools whose machining process is frequently changed. It is advantageous to automatically attach and detach tools only in order to improve cycle time. This idea reflects the above idea,
The object of the present invention is to provide a tool support member which is integrated with a rotary tool immovably fixed on a turret and is equipped with an automatic tool attachment/detachment function system, thereby eliminating the drawbacks of the prior art.

Hereinafter, the present invention will be explained based on practical drawings.

Reference numeral 1 denotes a turret which is a tool support member attached to a set of tool feeders 2 of an NC lathe, and includes a tool feeder that feeds in the direction of the main axis (Z-axis) of the main spindle that grips and processes the workpiece. The tool is brought to the processing area through a relative feeding operation of a tool feed stand that performs a feeding operation in a direction (X-axis) perpendicular to the main axis direction. The turret 1 is connected to the tool feeder 2 via an indexing shaft 3 that rotates around an axis in either the X-axis or the Z-axis, which is the feeding direction of the tool feeder 2.
supported on top. A pair of coupling rings 4 for removably fixing the turret 1 to the tool feeder 2 are attached around the indexing shaft 3, and a movable coupling 4a fixed to the turret 1 side is arranged around the indexing axis. The index shaft 3 moves relatively in the axial direction due to the fluid pressure action of the fluid pressure chamber, and meshes with a fixed coupling ring 4b fixed to the tool feed carriage 2. The indexing shaft 3 is rotated about the indexing axis via suitable drive means to select and index the tool on the turret 1 to a machining position. A first tool spindle 5 has a rotation axis in the axial direction of the main shaft or in a direction perpendicular to this axial direction, and is rotatably supported on the tool mounting surface of the turret 1, and the rotary tool 6 is attached to the first tool spindle via a holder 7. 1 tool is held on the spindle 5.
A drive shaft 8 is rotatably supported on the turret 1 in parallel with the indexing shaft 3, and a transmission shaft 9 is rotatably supported on the tool feeder 2 and receives rotational force from an external drive motor or the like. Due to the on/off operation of transmission,
It is transmitted to the first tool spindle 5. Specifically, a drive system in which a gear 10 provided on the drive shaft 8 and a gear 11 fixed to the first tool spindle 5 are directly engaged with each other, and
There is a drive system in which gear groups 13 and 14 provided on the first tool spindle 5 and gears 10 and 11 on the drive shaft 8 mesh with each other, and the selection of both drive systems depends on the direction of the rotation axis of the rotary tool 6. It is determined. A pair of clutches 15 are provided on the drive shaft 8, together with the transmission shaft 9 and the drive shaft 8, for switching on and off the transmission between the drive shaft 8 and the transmission shaft 9 through the operation accompanying the clamping action of the turret 1. There is a movable clutch 15a on the 8 side.
are fixed, and a fixed clutch 15b is fixed to the transmission shaft 9 and engages with each other when the turret 1 is positioned to be clamped.

16 is a second tool spindle that is rotatably supported on the turret 1 and has an automatic tool attachment/detachment exchange function in which attachment/detachment and exchange of the rotary tool 6 is automatically performed in addition to the immovable and fixed rotary tool 6. There is. Specifically, the collet 17, which is a gripping member that holds the rotary tool 6 on the second tool spindle 16, is held within the diameter of the main shaft end of the second tool spindle 16, and opens through its own spring force. The collet 17 is attached to the second tool spindle 1
The second tool spindle 16 is held relatively freely in the axial direction within the second tool spindle 16, and is connected by a connecting rod 18 that projects slightly outward from the entire length of the second tool spindle 16. Second
Connecting rod 18 held within tool spindle 16
The handle of the holder 20 that holds the rotary tool 6 is pulled into the tapered inner diameter portion of the second tool spindle 16 through the action of the compression spring 19 interposed around the holder, and the wedge effect causes the collet 17 to resist its own spring force. Close and grasp. A gear 21 fixed to one of the drive shafts 8 in a transmission relationship with one of the drive systems mentioned above.
meshes with a gear 22 fixed on the second tool spindle 16, and rotation is transmitted to the second tool spindle 16 simultaneously with the engagement of the clutch 15. Reference numeral 23 indicates that the rotating tool 6 of the collect 17 is placed on the second tool spindle 16 when exchanging a machined tool with a new rotating tool pulled out from the tool stocker or tool magazine via the tool changer.
In the tool attachment/detachment means for releasing the gripping clamp on the tool, the gripping clamping force of the collet 17 on the tool is caused by the operation of the piston 25 installed in the fluid pressure chamber 24 provided in the tool attachment/detachment means. 26 operates, pressing the rear end of the connecting rod 18 and deflecting the compression spring 19, thereby releasing the clamp of the opening tool by the self-spring force of the collet 17. The oil passage leading to the fluid pressure chamber 24 is connected to the index shaft 3 and the turret 1.
It is connected to an oil passage formed in the main body and is controlled by an external fluid operating means.

From the above, the operation of the present invention will be explained.

Transmission of the fixed rotary tool 6 is possible by selecting either of the two drive systems described above, and when the rotary tool 6 is indexed via the turret 1 and brought to the machining position, the coupling When positioning and clamping the turret 1 by 4, the drive shaft 8 and the transmission shaft 9
The clutch 15 that turns on and off the transmission engages, and immediately thereafter the first tool spindle 5 is rotated by the power of the drive motor. The transmission drive of the second tool spindle 16, which has a tool attachment/detachment exchange function, is transmitted by the gear 21 fixed to the drive shaft 8 of the first tool spindle 5 and the second tool spindle 5, which are transmitted from the two transmission drive systems.
It is rotated by the transmission action of a gear 22 fixed to the tool spindle 16. Second tool spindle 16
The transmission on/off is exactly the same as the transmission operation of the fixed type rotary tool mentioned above, and at the tool change position,
Tools are exchanged via the tool attachment/detachment means 23.

From the above, in this invention, by having an immovable rotary tool and a second tool spindle that has a tool attachment/detachment function, it not only reduces cycle time but also has functions for a wide variety of purposes and for large quantities. , has extremely high productivity in terms of efficiency when pursuing flexibility in productivity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. 1...turret, 2...tool feed stand, 4...coupling, 5...first tool spindle, 6...
... Rotating tool, 8 ... Drive shaft, 9 ... Transmission shaft, 16
... Second tool spindle, 23 ... Tool attachment/detachment means.

Claims (1)

[Scope of utility model registration request] A turret 1 capable of indexing and positioning a tool at a machining position, a transmission shaft 9 supported by a tool feeder 2 and operated by transmission of the rotational force of a drive motor, and a transmission shaft 9 supported by the turret 1 and a transmission shaft 9 of the turret 1 A drive shaft 8 to which rotation is transmitted by the on/off operation of a pair of clutches 15 during positioning, and a first tool supported by the turret 1 to hold the rotary tool 6 immovably and rotated by the transmission of the drive shaft 8. spindle 5
A connecting rod 18 connected to a collet 17 holding the rotary tool 6 is held within the second tool spindle 16 which is biased by a compression spring 19 and rotates under the transmission of the drive shaft 8. A tool support member for an NC lathe, comprising a tool attachment/detachment means 23 for releasing the clamp of the collet 17 from the rotary tool 6 by pressing the rear end of the collet 18 and deflecting the compression spring 19.