JPH0857742A - Nozzle device - Google Patents

Abstract

PURPOSE: To provide a nozzle device that can be added being adapted to a main spindle of an optional outer diameter, with each nozzle unit series- connected by a special joint pipeline excellent in rotational toque transmissibility and cutting solution feeding performance. CONSTITUTION: Plural nozzle units N are oscillatingly disposed at the outer periphery of the main spindle of a machine tool and the tip of a robot arm. The respective nozzle units N are series-connected by an oscillating fluid feed pipe 21 and communicated with a drive source SM and a cutting solution supply source C provided separately so as to oscillate the direction of each nozzle (n) simultaneously by the drive source SM through the oscillating fluid feed pipe 21 and to feed the cutting solution to each nozzle (n) from the cutting solution supply source C through the oscillating fluid feed pipe 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant nozzle direction control device for machining a workpiece by a machine tool or a robot, and more particularly to a coupling drive structure of a type in which a plurality of nozzles are installed around a spindle.

[0002]

2. Description of the Related Art Conventionally, in a machining center or the like for automatically exchanging tools having different shapes and sizes, it is necessary to control the nozzle direction to an optimum position for the tool. As a technique for controlling the nozzle direction at the tip of the tool in response to this tool exchange, in No. 60-134535, the one with a long tool length or a large tool diameter has a plurality of nozzles set around the spindle. The tool is cooled and lubricated by the cutting fluid sprayed from each nozzle, and the nozzle directions are adjusted all at once. In this interlocking structure, one drive motor or the like adjusts each nozzle direction by interposing a ring gear or a link mechanism, and the cutting fluid is supplied to each nozzle by a pipe that is separately arranged.

[0003]

In the nozzle device having a plurality of nozzles around the main shaft, not only is the mechanism for simultaneously controlling the nozzle directions complicated, but a large space for mounting the nozzles around the main shaft is required. In addition, cutting fluid piping must be provided separately, which is also difficult to retrofit. In particular, when the outer diameter of the main shaft is different, there is a problem in that a dedicated design must be performed in accordance with this. Further, if the robot arm having a tool at the tip thereof is equipped with a nozzle device, a compact structure is required.

The present invention has been made in view of the above problems, and each nozzle unit is connected in series by a special joint pipe excellent in the transmission of the rotational torque and the feedability of the cutting fluid. It is an object of the present invention to provide a nozzle device that can be attached to a main shaft of a diameter or the tip of a robot arm.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to claim 1 of the invention, in which the swing feed is supported by a supporting tool on both ends of the outer periphery of the spindle of the machine tool and the tip of the arm of the robot. A plurality of pipes are arranged in series, a nozzle unit is installed in each of the rocking supply pipes, and the ends of the rocking supply pipes that are joined to each other are screwed together to form a support for the rocking supply pipes. A nozzle device is characterized in that a cutting fluid supply source is connected to the above, and a swing drive pipe is connected to a separate drive source at one end.

According to a second aspect of the present invention, the rocking feed pipe is provided with spherical screw portions at both ends thereof, and the relay portion is cut out to be connected to a relay pipe whose expansion and contraction can be adjusted. The nozzle device is characterized in that a nozzle is directly attached to the pipe or a swingable nozzle unit is fitted.

[0007]

According to the first aspect of the present invention, since the nozzles arranged on the outer circumference of the main shaft and the tip of the robot arm are connected in series by the rocking supply pipe, when the rocking supply pipe is driven to rotate, The nozzles are simultaneously controlled in their direction. Then, when the cutting fluid is supplied from the cutting fluid source to the oscillating feed pipe, the cutting fluid is simultaneously jetted from each nozzle. In particular, one swinging supply pipe exerts two functions of rotating in the nozzle direction and supplying cutting fluid.

According to the second aspect of the present invention, the swinging feed pipe having excellent rotational torque transmissibility and cutting fluid feedability performs two functions of transmitting rotational power and supplying cutting fluid. . In particular, since the rotation power can be transmitted and the cutting fluid can be supplied on the concentric shaft, the space can be saved, the structure can be simplified, and an arbitrary spindle outer diameter can be applied.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the drawings including the technology described in each claim of the present invention will be described below. FIG. 1 shows an overall configuration of the present invention in an embodiment of a machine tool. The machine tool is a table on which a work is placed, a spindle 1 equipped with a tool T1 and a spindle head 2 thereof.
And the arm 10 of the ATC device for exchanging various tools T1
Is provided.

A plurality of nozzle units N, such as cutting fluid, which can be controlled in direction, are provided at the lower end of the outer periphery of the spindle head 2 of the machine tool. Then, in order to direct the nozzles n of the plurality of nozzle units N to the tip of the outer periphery of the tool T1, they are controlled in unison in conjunction with the direction (details will be described later). For each nozzle n, for example, the direction is stored in advance by a teaching method in which the tip of each tool mounted on the spindle is visually oriented, and the nozzle direction is playback-controlled corresponding to each tool during machining of a workpiece (details will be described later). . Alternatively, the nozzle direction is sequentially stored in the memory as an angle calculated in advance from the tool size (tool length, tool outer diameter) to the tool tip to be mounted on the spindle, and the stored nozzle direction command is stored every time the tool is replaced by machining a workpiece. The value is called every time the tool is changed, and the nozzle direction is controlled (details will be given later).

As shown in FIG. 1, each nozzle unit N is excellent in rotational torque transmission and cutting fluid delivery so that the direction control of each nozzle n and the supply of cutting fluid C can be performed at the same time. They are connected in series by a swing feed pipe 21. Then, a flexible source F or the like is connected to a drive source SM (for example, a motor with an encoder E) that is a remote control unit provided separately, and the arm 10 or the like operates the limit switch LS at the tool replacement position O1 to send this replacement signal. The control unit MC of the receiving sequencer 100 activates the motor (servo motor with encoder E, etc.) SM via the drive D1, and rotates the nozzle n from the drooping standby position (O) in the tip direction A of the tool T1 shown by the solid line. Let Cutting fluid supply source (not shown)
Is also connected via a supply pipe P.

Next, the structure of the nozzle unit N, the structure of the oscillating supply pipe 21, the connecting structure of these, and the sequencer 100.
The function of is explained. First, the structure of the nozzle unit N is
As shown in FIGS. 2 and 3, on the outer periphery 1A of the main spindle of the machine tool,
The two-sided support tools 20 fixed by the band B are arranged at regular intervals. The rocking supply pipes 21 supported between the two support tools 20, 20 have their tip spherical portions 21A, 21A rotatably and swingably with respect to a pair of bearing spherical surfaces 20A, 20A in the support tool 20. Engaged. The tip spherical portion 21
A and 21A are waterproof with a seal 23, and the bearing spherical surface 2
It is locked by a retaining ring 24 so as not to come off from 0A and 20A. Further, each ball 21A has a bevel gear G1,
Since G1 is engraved and meshed with each other, the support 2
The rotational force is transmitted in the state of being arranged at a predetermined facing angle α, α in 0, and the cutting fluid C is also simultaneously supplied from the pipe P to one of the support tools 20.

The tail ends (free ends) of the rocking supply pipes 21 and 21 engaged with both the support members 20 and 20 are connected by a relay pipe 25 and expanded and contracted to a predetermined length by a set screw 26. It is fixed under adjustment. The predetermined length is determined by the number of nozzle units N and the outer diameter of the spindle. Also,
A nozzle pipe 27 is fitted to the relay pipe 25 in an airtight and swingable manner, and is used in a state where the nozzle n is temporarily fixed in a predetermined direction. Several sets of the nozzle units N are arranged on the outer circumference 1A of the main shaft.

Further, at one end of the nozzle unit N,
A rotary transmission member 31 including a worm 28 and a worm wheel 29 connected to the flexible wire F is provided, and the output shaft 30 has its tip spherical portion 30A inserted into the support tool 20 so that the first swing feed pipe 21 can be connected. The tip spherical portion 21A and the bevel gears G1 and G1 are screwed together. Therefore, the flexible wire F swings the swing feed pipes 21 connected in series via the rotary transmission member 31 in the forward and reverse directions all at once, and the nozzle n
Control the direction of. Since each nozzle unit N is connected to the rocking supply pipe 21 and is also connected to the cutting fluid supply source, the cutting fluid is jetted all at once by supplying the cutting fluid.

A control system centered on the sequencer 100 for controlling the above-mentioned respective parts will be described with reference to FIG. Sequencer 10
0 is an I / O circuit 50 for inputting a tool exchange signal from the limit switch LS, a switching signal from the teaching and play back changeover switch S1 and an "up move", "down move" and "memory" command from the teaching BOX. Receiving these commands, the nozzle direction command value is stored in the memory M, and the stored nozzle direction command value is sequentially called by the tool change signal from the limit switch LS to drive the drive D1.
And a control unit MC for driving the drive source SM via the command value.

The drive source SM controls the direction of the nozzle n.
A command value from the encoder E for adjusting according to the turning angle is stored in the memory M as data of a nozzle direction command value corresponding to each tool at the time of teaching. And
The nozzle direction control at the time of play back is based on open loop control in which a tool change signal from the limit switch LS is received, the nozzle direction command value is sequentially output, and the drive source SM is sequentially rotationally controlled. (Comparison control by the encoder E is not performed). Then, for all tools used for machining one workpiece, the nozzle inclination θ corresponding to the time of teaching is sequentially stored in the memory M as a nozzle direction command value. Then, during play back accompanied by tool exchange due to work machining, this nozzle direction command value is sequentially output in response to the tool exchange signal from the limit switch LS that operates corresponding to the ATC operation order, and the motor SM is output.
Are sequentially controlled to rotate.

The nozzle device of the present invention is constructed as described above and operates as follows. First, since the nozzles n arranged on the outer periphery of the main shaft are connected in series by the rocking feed pipe 21, when the drive feed pipe 21 is rotationally driven by the motor SM, the nozzles n control their directions all at once. To be done. Then, when the cutting fluid C is supplied from the cutting fluid source to the oscillating supply pipe 21, the cutting fluid is simultaneously jetted from each nozzle. In particular, the action of exhibiting two functions of rotating in the nozzle direction and supplying cutting fluid by one swing supply pipe is a feature of the present invention.

Further, according to the present invention, the oscillating feed pipe 21 is excellent in the transmission of the rotational torque and the feed of the cutting fluid.
Two functions are performed: transmission of rotational power for controlling the nozzle direction and supply of cutting fluid C. In particular, the transmission of the rotational power and the supply of the cutting fluid can be performed on the concentric shaft by the oscillating feed pipe 21, which is expandable and contractible, so that the space can be saved and the configuration can be simplified, and any spindle outer diameter can be applied. The operation is the feature of the present invention.

The present invention is not limited to the above embodiment, and design changes can be freely made within the scope of the invention. For example, when a tool is provided at the tip of the robot arm for processing a workpiece, a nozzle device may be provided at the outer circumference of the tip. The number of nozzle units N can be appropriately increased or decreased, and as shown in FIG. 4, the swinging supply pipe 21 on the way is closed, and the air source and the coolant source are supplied from the left and right support tools 20, 20. It is possible to perform air blowing before and after machining the workpiece and to supply coolant when machining the workpiece. The coolant may be water-soluble or oil-based.

Further, in the nozzle unit N, the tail ends of the rocking supply pipes 21 and 21 are connected by a relay pipe 25, and a nozzle pipe 27 is swingably fitted to the relay pipe 25. It is a fitting configuration. This may be an embodiment in which the relay pipe 25 and the nozzle pipe 27 are integrated as shown in FIG. That is,
A nozzle n is projected from the middle part of the relay pipe 25 ', the direction of this nozzle is adjusted by twisting the relay pipe 25', and the nuts 40, 40 at both ends are fixed to the rocking feed pipes 21, 21. I am trying.

According to the above modified embodiment, the swing feed pipe 21 is provided.
On the other hand, since it has a single structure, the structure is simple and the adjustment of the lengths of the swinging supply pipes 21 and 21 in the nozzle direction and in a straight line can be easily performed by loosening the nut bodies 40 and 40 at both ends. In addition, 21 'is a swinging supply pipe of a solid rod,
Used when you want to shut off coolant C.

[0022]

According to the first aspect of the present invention, the nozzles arranged on the outer circumference of the main shaft or at the tip of the robot arm are connected in series by the oscillating feed pipe, and when the oscillating feed pipe is rotationally driven, all the nozzles move at the same time. When the direction is controlled and the cutting fluid is supplied from the cutting fluid source to the oscillating feed pipe, the cutting fluid is jetted simultaneously from each nozzle. In particular, there is an effect that one swing supply pipe exerts two functions of rotating in the nozzle direction and supplying cutting fluid.

According to a second aspect of the present invention, the concentric shaft is used for transmitting the rotational force and for supplying the cutting fluid by means of a swinging feed pipe having excellent transmissibility of rotational torque and feedability of cutting fluid, and excellent elasticity. Since it can be carried out on the above, there is an effect that space is saved, the structure is simplified, and it can be applied to any spindle outer diameter.

[Brief description of drawings]

FIG. 1 is a front view showing a nozzle device of a machine tool of the present invention.

FIG. 2 is a partially enlarged sectional view of the nozzle device of the present invention.

FIG. 3 is a cross-sectional view in which the nozzle device of the present invention is mounted on a main shaft.

FIG. 4 is a sectional view showing a modified embodiment of the nozzle device of the present invention.

FIG. 5 is a partial cross-sectional view showing a modified example of the nozzle device of the present invention.

[Explanation of symbols]

 1 Spindle 2 Spindle Head N Nozzle Unit n Nozzle 10 Arm 21 Swing Supply Pipe 20 Support 20A Bearing Spherical 21A Tip Sphere 25, 25 'Relay Pipe 27 Nozzle Pipe 30 Output Shaft 31 Rotation Transmission Member 40 Nut Body C Cutting Fluid SM drive motor F Flexible wire 100 Sequencer θ Nozzle tilt

Claims (2)

[Claims] 1. A plurality of oscillating supply pipes, which are supported by supporters on both ends, are arranged in series at the outer periphery of a main shaft of a machine tool and the tip of an arm of a robot, and a nozzle unit is provided in each of the oscillating supply pipes. In addition to the installation, screw the joint ends of the rocking feed pipes together to connect the cutting fluid supply source to the support tool of the rocking feed pipe, and install it separately at one end of the rocking feed pipe. Nozzle device characterized in that it is connected to a drive source. 2. The oscillating feed pipe according to claim 1,
In addition to attaching spherical screw parts at both ends, cut out this relay part and connect it to a relay pipe that can adjust expansion and contraction, and further attach a nozzle directly to the relay pipe or fit a swingable nozzle unit. Nozzle device characterized in that.