JPS6144762Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a coolant supply device for machine tools such as machining centers, and its purpose is to directly supply coolant to the cutting point of a workpiece using a tool holder. With,
Coolant is supplied to the tool holder from a fixed part of the spindle head via a rotating sleeve provided on the tool holder, and the tool holder and rotating sleeve are held in a non-rotatable manner while the tool is stored in the magazine and transported, This ensures reliable position indexing of the coupling port of the rotating sleeve with respect to the coolant supply port of the spindle head.

Hereinafter, specific embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an overall view of a machine tool (manufacturing center) equipped with a coolant supply device according to the present invention, in which 1 is a bed, 2 is a slide table provided on the bed 1, and 3 is a top of the slide table 2. 4 is a rotary table for placing a workpiece installed on another slide table 3; 5 is a column set upright on the bed 1; 6 is a spindle head; The main shaft 7 is rotatably supported on the main shaft head 6 and is stopped at a fixed angle by a fixed position indexing device (not shown). , a tool T is set on the main shaft 7 by a tool holder 8.
Further, 9 is a tool magazine installed at the top of the column 5, and 10 is an automatic tool changer installed at the front of the column 5 between the tool magazine 9 and the spindle head 6. The identified tool in the magazine 9 is grasped by one of the grasping claws 10b, 10b of the exchange arm 10a and conveyed to the magazine 9.
It is designed to be gripped by 0b and conveyed to the main shaft 7 for installation.

Fig. 2 shows the main structure of the coolant supply part according to the present invention.To fix the tool holder 8 to the main shaft 7, insert the shank portion 8a into the tapered hole 7a of the main shaft 7, and then insert the shank portion 8a into the tapered hole 7a of the main shaft 7. This is done by hooking a pull stud 11 protruding from the top of the main shaft 7 to an attachment/detachment operation bar 12 provided at the axis of the main shaft 7 and pulling it rearward. Further, a drive key 13 is protruded from the nose end surface of the main spindle 7, and when the tool holder 8 is attached to the main spindle 7, the grip part 8b of the tool holder 8
A key groove 8c provided in the tool T engages with the key 13 to maintain a constant angular position in the rotational direction of the tool T with respect to the main shaft 7 which is stopped at a fixed position.

A coolant flow path 14 is formed in the axis of the tool holder 8, extending from the tool mounting tip toward the shank portion 8a, and a discharge port 15 communicating with one end of this flow path 14 is used to coolant from this point. The opening is opened so that the coolant is directed to the cutting point of the workpiece (not shown) by the tool T, and the other end of the flow path 14 is communicated with a ring-shaped groove 16 formed on the outer peripheral surface of the tool holder 8. Further, a rotary sleeve 17 is provided on the outer circumference of the tool holder 8 corresponding to the ring-shaped groove 16.
is attached so as to be relatively rotatable via a bearing 18, and this rotary sleeve 17 has a socket portion 19 projecting from its outer periphery, and a tool holder is provided on the side surface of this socket portion 19 opposite to the spindle head 6. 8
A coupling port 20 is formed extending parallel to the axis of the rotating sleeve 17 (see FIG. 3), and a flow path 21 is formed in the rotary sleeve 17 to communicate between the coupling port 20 and the ring-shaped groove 16. A check valve 22 is installed in the communication portion between the flow path 21 and the coupling port 20. Reference numeral 23 denotes a plug constituting a coolant supply port attached to the nose end surface of the spindle head 6, and an insertion portion 24 is formed at the tip thereof to be inserted into the coupling port 20 of the socket portion 19 as shown in FIG. is,
A check valve 25 is built inside, and the plug 23 is communicated with a passage 26 formed in the spindle head 6 through the check valve 25, and the opening end of the passage 26 is connected to a switching valve (not shown). and is adapted to be connected to a coolant supply source via.

Further, a ring-shaped groove 27 is formed on the outer periphery of the gripping portion 8b of the tool holder 8, and the gripping portion 8b of the tool holder 8 is connected to the tool changing arm 10a.
When the gripping claws 10b, 10b are clamped from both left and right sides, the protrusions 10c, 10c protruding from the inner surface of the clamping side of the gripping claws 10b, 10b (Figs. 4 and 5)
) is adapted to engage the groove 27 of the gripping portion 8b, and a locking key 28 is attached to the inner surface of the clamping side of one of the gripping claws 10b as shown in FIGS. 4 and 5. A key groove 29 that engages with the detent key 28 is formed on the circumferential surface of the tool holder gripping portion 8b, and a key groove 30 is provided on the circumferential surface of the rotary sleeve 17 facing the key groove 29. By engaging the locking key 28 also in the groove 30, the relative relationship between the rotating sleeve 17 and the tool holder 8 is prevented when a tool is transferred from the magazine 9 to the main shaft 7 or from the main shaft 7 to the magazine 9 and installed. Makes rotation impossible. Furthermore, as shown in FIGS. 4 and 5, a key clearance groove 32 is formed on the inner surface of the clamping side of the other gripping claw 10b that faces the one gripping claw 10b.
A key groove 31 is formed on the circumferential surface of the tool holder gripping part 8b facing the tool holder 8b, and another key groove 33 is provided on the circumferential surface of the rotating sleeve 17 facing the key groove 31, so that the tool T can be held in the tool holder 8. When installed in the magazine 9 together with the tool holder, the key grooves 31 and 33 engage with the locking key 34 (see Fig. 1) provided on the magazine 9, making relative rotation between the rotating sleeve 17 and the tool holder 8 impossible. The posture of the rotating sleeve 17 is maintained constant.

Next, the operation of the present invention configured as described above will be explained.

First, when exchanging tools, the tool in the identified magazine 9 and the tool on the spindle 7 that is no longer needed are exchanged by the automatic tool changer 10. When the arm 10a is gripped by the gripping claws 10b, 10b, the gripping claw 10 is
The anti-rotation keys 28 of b engage with the keyways 29 and 30, respectively, to prohibit relative rotation between the tool holder 8 and the rotary sleeve 17, and at the same time keep the postures of the tool holder 8 and the rotary sleeve 17 with respect to the tool exchange arm 10a constant. to hold. In this state, the tool holder 8 held by the tool changing arm 10a is positioned on the front axis of the main spindle 7, and the shank portion 8a of the tool holder 8 is moved by the operation of the tool changing device 10.
is inserted into the tapered hole 7a of the main shaft 7 and fixed by the attachment/detachment operation bar 12, the coupling port 20 of the socket portion 19 of the rotary sleeve 17 held at a constant angular position is inserted into the plug 23 as shown in FIG. The socket part 19 and the plug 23 are connected to each other.

Next, the gripping claws 10b, 1 of the tool exchange arm 10a
0b escapes as shown in FIG. 1, the spindle 7 is rotated, and the machine tool enters the cutting position, coolant is introduced from the coolant supply source into the flow path 26 of the spindle head 6, and this coolant is further passed through the check valve 25- Plug 23 - Check valve 22 - Channel 21 - Groove 16 -
It is ejected from the discharge port 15 through the flow path 14 to the cutting point. Then, the tool that has been replaced and is no longer needed is inserted into the magazine 9 at the same time as the new tool is inserted into the main shaft 7, with the relative rotation of the tool holder 8 and the rotary sleeve 17 being restricted by the rotation stopper key 34.

It should be noted that the device of the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various changes can be made without departing from the scope of the claims for utility model registration.

As described above, in the coolant supply device of the present invention, since the tool holder is used to supply coolant to the cutting point of the workpiece, coolant can be directly supplied to the cutting point, and moreover, coolant can be supplied to the tool holder. Coolant is supplied from a fixed spindle head via a rotary sleeve that is rotatable relative to the tool holder, so the flow path configuration is simpler than when coolant is supplied from a rotating spindle to the tool holder. This is easy to do, and there is no risk that the spindle will be contaminated by coolant or that chips will adhere to the spindle or the shank of the tool holder, which will impede tool mounting.

In addition, while the tool is stored in the magazine and during transportation for tool exchange, the anti-rotation key provided on the tool magazine and tool exchange arm engages with the keyway formed on the rotary sleeve to rotate the tool holder and the rotary sleeve relative to each other. This makes it possible to maintain a constant positional relationship between the coolant supply port (plug) of the spindle head and the coupling port (socket portion) of the rotating sleeve with an extremely simple configuration, which makes it possible to maintain a constant positional relationship between the coolant supply port (plug) of the spindle head and the connection port (socket portion) of the rotating sleeve. The coupling port can be reliably coupled to the supply port only by the attachment/detachment operation, and coolant can be supplied quickly and reliably.

[Brief explanation of drawings]

Fig. 1 is an overall view of a machine tool equipped with a coolant supply device according to the present invention, and Fig. 2 is a diagram showing the details of the coolant supply part in the present invention.
FIG. 3 is an enlarged sectional view of the coolant delivery portion in FIG. 2, FIG. It is a sectional view taken along the - line in the figure. 6...Spindle head, 7...Spindle, 8...Tool holder, 9...Magazine, T...Tool, 10...Automatic tool changer, 10a...Tool change arm, 10
b...Gripping claw, 14...Flow path, 15...Discharge port,
17...Rotating sleeve, 19...Socket part, 2
0... Connection port, 21... Channel, 23... Plug (supply port), 24... Insertion part, 26... Channel, 28
...Non-rotation key, 29...Keyway, 30...Keyway, 31, 33...Keyway, 34...Non-rotation key.

Claims (1)

[Scope of utility model registration request] In a machine tool in which tools stored in a tool magazine are transferred to a main spindle by a tool changer, a coolant supply flow path to a cutting point of a workpiece is formed inside and engaged with a drive key protruding from the main spindle. A tool holder having a keyway formed therein; and a tool holder which is attached to the tool holder so as to be relatively rotatable, has a flow passage inside thereof communicating with the flow passage of the tool holder, and has a keyway at a position corresponding to the keyway of the tool holder. A rotary sleeve formed, a coolant connection port provided on an end surface of the rotary sleeve opposite to the spindle head and communicating with the flow path of the rotary sleeve, and a coolant connection port provided at the tip of the spindle head to allow the tool holder to be attached to and removed from the spindle. A coolant supply port is removably connected to the coolant connection port, and a coolant supply port is provided in the tool magazine and engages with each keyway of the tool holder and the rotating sleeve to connect the tool holder and the rotating sleeve while the tool magazine is being stored in the magazine. a detent key that disables relative rotation; and a detent key provided on the tool exchange arm that engages with each keyway of the tool holder and the rotating sleeve during conveyance of the tool to disable relative rotation between the tool holder and the rotating sleeve. A coolant supply device for a machine tool, which is equipped with a rotation prevention key.