JP2001212735A - Oil mist injecting device and its controlling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically adjust an injection position of an injection nozzle and eliminate chips and to inject oil mist to a cut part under an optimum condition for cutting work. SOLUTION: This oil mist injection device is provided with an oil mist generator 18 producing oil mist, the injection nozzle 24 connected to the tip of a tube 20 extending from the oil mist generator 18 for injecting oil mist 22 toward the cut part, and a controllable injection nozzle holding mechanism 26 holding the injection nozzle 24 movably upward/backward and freely oscillationally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention significantly reduces the amount of used cutting fluid by injecting a mist of a cutting fluid into a mist during cutting or grinding. The present invention relates to an oil mist injection device and a control method thereof.

[0002]

2. Description of the Related Art For example, when a grindstone is rotated at a high speed to grind a metal surface, or when cutting a workpiece using a machine tool, it is widely used to supply a cutting oil to a cutting portion. Is being done. This cutting fluid mainly has a lubricating action, a cooling action and a cleaning action, and is generally used in the form of a liquid, and is directly poured into a cutting portion. In this case, a large amount of cutting oil is required, which not only leads to an increase in cost, but also generates a large amount of waste liquid, and it is necessary to perform this treatment in a poor environment.

[0003] For this reason, an oil mist generator and an injection nozzle are provided, and an oil mist obtained by converting a cutting oil into a mist is injected from the injection nozzle toward a cutting portion so as to reduce the amount of the cutting oil used. An oil mist injection device has been developed. In this oil mist injection device, when the injection position and direction of the injection nozzle and a large amount of cutting chips are generated, this processing poses a problem.

In order to cope with this, conventionally, an injection nozzle is connected to the tip of a flexible tube that can be expanded and contracted, and the base of the flexible tube is held by a stand or the like standing on the side of a processing table. By manually operating the tube, the injection position and direction of the injection nozzle at the start of cutting and during cutting have been adjusted. Further, when the cutting chips are accumulated until the oil mist is blocked, the processor manually removes the cutting chips on the processing table.

[0005]

However, in the above conventional example, the injection position of the injection nozzle is adjusted,
Since the work of removing cutting chips was done manually, this work was not only troublesome and dangerous, but also
There is a problem that the oil mist cannot be sprayed toward the cut portion in an optimal state for the cutting process.

The present invention has been made in view of the above circumstances, and automatically adjusts the injection position of an injection nozzle and removes cutting debris, and directs oil mist to a cut portion in an optimal state for cutting. It is an object of the present invention to provide an oil mist injection device capable of injecting by injection and a control method thereof.

[0007]

According to the first aspect of the present invention, there is provided an oil mist generator for generating an oil mist,
An injection nozzle that is connected to the tip of a tube extending from the oil mist generator and injects oil mist toward a cutting portion, and a controllable injection nozzle holding mechanism that holds the injection nozzle vertically and swingably. It is an oil mist injection device characterized by having.

[0008] Thus, the injection position and direction of the injection nozzle can be automatically changed via the injection nozzle holding mechanism for holding the injection nozzle, and the oil mist can be injected from the injection nozzle toward the cutting portion. .

According to a second aspect of the present invention, there is provided an oil mist generating device for generating oil mist, a high pressure air generating source for generating high pressure air, and a tip end of a tube extending from the oil mist generating device and the high pressure air generating source. It is characterized by having an injection nozzle that is connected to selectively jet oil mist or high-pressure air toward a cutting portion, and a controllable injection nozzle holding mechanism that holds the injection nozzle vertically and swingably. Oil mist injection device.

Accordingly, by switching the high-pressure air from the injection nozzle to the oil mist when necessary, the cutting chips can be automatically blown off and removed by the high-pressure air injected from the injection nozzle.

According to a third aspect of the present invention, in controlling the oil mist injection device according to the first aspect, the injection position of the injection nozzle with respect to the blade at the start of cutting is preset for each blade, and the injection nozzle sets the injection position. The cutting position is controlled by controlling the injection position of the injection nozzle via the injection nozzle holding mechanism so as to be positioned at the position, the cutting state after the start of the cutting is monitored, and the cutting tool is adjusted so as to match the preset cutting conditions. And controlling the relative position and relative angle of the injection nozzle in the vertical direction with respect to the oil mist injection device via the injection nozzle holding mechanism.

The cutting conditions include, for example, cutting resistance (or rotational torque or machine tool power), surface temperature of the blade tip processing portion, work surface temperature of the work, vibration of the blade, and the like. By controlling the position of the injection nozzle so that at least one of them is equal to or less than a preset value, the oil mist can be injected in a state optimal for cutting.

According to a fourth aspect of the present invention, in controlling the oil mist injector according to the second aspect, the injection is performed periodically and / or by monitoring a cutting condition so as to meet a preset cutting condition. A method for controlling an oil mist injection device, characterized in that the injection of oil mist from a nozzle is switched to the injection of high-pressure air for a predetermined time.

According to a fifth aspect of the present invention, when high-pressure air is injected from the injection nozzle, the injection nozzle is swung or moved in the left and right and / or up and down directions via the injection nozzle holding mechanism. The control method of the injection nozzle injection device according to claim 4. Thereby, the cutting chips can be effectively blown off with high-pressure air and removed.

According to a sixth aspect of the present invention, the cutting operation is temporarily stopped during the cutting operation to move the blade or the work, and high-pressure air is jetted from the injection nozzle toward the work for a certain time, and then the cutting operation is performed again. The control method for an oil mist injection device according to claim 4 or 5, wherein the cutting operation is continued by returning the work to the original position. Thereby, when the cutting chips are blown off with high-pressure air and removed, it is possible to prevent the cutting tool from being in the way.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an oil mist injection device according to a first embodiment of the present invention.
An example is shown in which the present invention is applied to a machine tool 16 in which the processing of cutting chips does not pose a problem, in which the upper surface of a workpiece 12 held by the processing table 10 is polished by a polishing tool (blade) 14 rotating at high speed.

This injection device is an oil mist generating device 18 for generating an oil mist in which a cutting oil is turned into a mist.
And a tube 20 extending from the oil mist generator 18, and connected to the tip of the tube 20 to cut the oil mist 22 into a cutting portion, that is, the work 12 and the polishing tool 14.
An injection nozzle 24 for jetting toward a contact portion with the nozzle, an injection nozzle holding mechanism 26 for detachably holding the injection nozzle 24, and an injection position of the injection nozzle 24 by controlling the movement of the injection nozzle holding mechanism 26. Control panel 2 for controlling
And 8.

The spray nozzle holding mechanism 26 has two arms, a first arm 30 and a second arm 32, which are flexibly connected to each other, and a base end side of the first arm 30 via a bracket 34. The second arm 32 is attached to the machine tool 16 and hangs downward to hold the injection nozzle 24 on the free end side of the second arm 32.

FIG. 3 shows the injection nozzle holding mechanism 26 in detail. As shown in FIG. 3, the base end of the first arm 30 is connected to an output shaft of a servomotor 40 for vertical movement. An auxiliary servomotor 42 for vertical movement is integrally attached to the base of the first arm 30, and a pivot 44 fixed to the base of the second arm 32 is loosely fitted to the free end of the first arm 30. A belt 50 is stretched between a pulley 46 fixed to the output shaft of the vertical movement auxiliary servomotor 42 and a pulley 48 fixed to the end of the pivot 44.

Thus, the vertical movement servo motor 40
The first arm 30 rotates in the vertical direction with the rotation of the motor, and the second arm 32 rotates in the vertical direction with the rotation of the auxiliary servomotor 42 for vertical movement.
By controlling the rotation of 0 and 42, the injection position of the injection nozzle 24 can be controlled.

Further, a vertical swing servo motor 52 is fixed to the base end of the second arm 32, and a shaft portion 56 of a mounting tool 54 is loosely fitted to a free end thereof. Pulley 58 fixed to the output shaft of motor 52
A belt 62 is stretched between the pulley 60 and the pulley 60 fixed to the shaft 56. A horizontal swing servo motor 64 is attached to the attachment 54 downward, and a chuck 66 for detachably holding the injection nozzle 24 is connected to an output shaft of the servo motor 64.

Thus, the vertical swing servo motor 52
With the rotation of the horizontal rotation servomotor 64, the injection nozzle 24 moves vertically.
Swing horizontally, and these servo motors 5
By controlling the rotation of 2, 64, the direction of the injection nozzle 24 with respect to the cutting portion can be controlled. In the injection nozzle holding mechanism 26 according to this embodiment, one of the servomotors 42 and 52 may be omitted.

Next, an example of control of the oil mist injection device of this embodiment will be described with reference to FIG. In this example, a cutting resistance is selected as a cutting condition, and the position of the injection nozzle 24 is controlled so that the cutting resistance does not exceed a predetermined value. An example is shown in which the injection is performed by rotating the tool, but the rotational torque, the power of the machine tool, the surface temperature of the blade tip processing portion, the processing surface temperature of the work, the vibration of the blade, or the like, or a combination thereof is used. Needless to say, cutting conditions may be set.

First, an entry-prohibited area of the injection nozzle 24 is set in view of the layout of the factory, prevention of interference with the machine body, blades, workpieces and fixtures, protection of workers, and the like. Set. Next, the injection position of the injection nozzle 24 is set according to the blade to be used, and the upper limit value of the cutting resistance is set. These settings are
The information is input from the control panel 28 and stored.

Then, after waiting for the input of the machining preparation signal, the injection nozzle 24 is moved to the standby position. Thereafter, the mist inlet valve of the oil mist generator 18 is opened, and the oil mist generating device 18 is turned on for 0 to 10 seconds through a timer, for example. The mist 22 is ejected from the ejection nozzle 24. The circulating flow rate of the oil mist at this time is measured, and if the circulating flow rate is less than a specified value, an oil mist abnormality alarm is issued.

If the circulating flow rate of the oil mist is larger than the specified value, a machining preparation completion signal is input to the machine tool main body, and the injection nozzle 24 is moved to a preset injection position.
Start processing.

After the start of cutting, the circulating flow rate of the oil mist is constantly monitored, and when the circulating flow rate is smaller than a specified value, an oil mist abnormality alarm is issued. When it exceeds, first, at least one of the servomotors 40 and 42 is driven while controlling the rotation thereof to bring the ejection position of the ejection nozzle 24 close to the work 12, and at least one of the servomotors 52 and 64 is further rotated. By driving while controlling, the angle of the injection nozzle 24 is changed. Thereby, the position and the direction of the injection nozzle 24 are automatically controlled so that the cutting resistance does not exceed the upper limit.

In this example, the injection position of the injection nozzle 24 is made closer to the work 12, but it may be made farther depending on the cutting conditions, and the driving order of the servomotors can be set arbitrarily. Of course, it may be possible.

Then, in response to the stop signal from the machine tool 16, the injection nozzle 24 is moved to the standby position, the oil mist inlet valve of the oil mist generator 18 is closed, and a series of machining is completed.

As described above, by controlling the injection position and direction of the injection nozzle 24 via the injection nozzle holding mechanism 26 so as to match predetermined cutting conditions such as, for example, cutting resistance, optimum cutting processing is performed. In this state, the oil mist 22 can be sprayed from the spray nozzle 24 toward the cutting portion.

FIGS. 5 and 6 show an oil mist spraying device according to a second embodiment of the present invention, which drills a work 72 using a drill (blade) 70, for example. An example is shown in which a large amount of cutting chips 74 are generated as in the case of the time, and the cutting chips 74 are suitable for the machine tool 16 in which the injection of the oil mist 22 is blocked.

In this oil mist injection device, a high pressure air generation source 80 for generating high pressure air, a tube 82 extending from the high pressure air generation source 80, and a tube 20 extending from the oil mist generation device 18 are switched, for example. A switching device 84 including a three-way switching valve is provided, and the injection nozzle 24 is connected to a distal end of a tube 86 extending from the switching device 84. Thereby, usually, the oil mist 22 generated by the oil mist generator 18 is injected from the injection nozzle 24 toward the cutting portion, and when necessary,
By switching from the tube 20 extending from the oil mist generator 18 to the tube 82 extending from the high-pressure air generation source 80 via the switching device 84, the high-pressure air 88 generated by the high-pressure air generation source 80 is transferred from the injection nozzle 24 to the cutting site. It is designed to inject. Other configurations are the same as those of the first embodiment.

In the oil mist injection device of this embodiment, as shown in FIG. 6, the high-pressure air 88 generated by the high-pressure air generation source 80 is changed to oil mist and directed from the injection nozzle 24 toward the cutting portion. By spraying, the work 72
The cuttings 74 stored in the blast can be blown off with high-pressure air 88 to be automatically removed. This drawing shows a state in which the cutting process is temporarily stopped and the drill (blade) 70 is lifted upward.

In this oil mist injection device, for example, every time a set period has elapsed since the start of cutting, the high pressure air 88 may be switched from the injection nozzle 24 to oil mist and injected. As in the case of the first embodiment, for example, cutting conditions (such as cutting resistance (or rotational torque or machine tool power), surface temperature of a blade tip processing portion, work surface temperature of a work, vibration of a blade, and the like) are used. May be set in advance, and the high-pressure air 88 may be switched from the injection nozzle 24 to the oil mist and injected so that at least one of them is equal to or less than a preset value.

When the high-pressure air 88 is injected from the injection nozzle 24, the injection nozzle 24 is moved up and down via the servo motors 40 and 42, or the servo motor 5
By swinging the injection nozzle 24 in the vertical or horizontal direction via the nozzles 2 and 64, the cutting chips 74 can be effectively blown off by the high-pressure air 88 and removed.

Further, during the cutting process, the cutting process is temporarily stopped, the blade 70 or the work 72 is moved, high-pressure air 88 is jetted from the injection nozzle 24 toward the work 72 for a certain time, and the blade 70 or the work is again stopped. By returning the 72 to the original position and continuing the cutting, it is possible to prevent the blade 70 from hindering when the cutting chips 74 are blown off with high-pressure air and removed.

In this embodiment, an example is shown in which the oil mist generating device and the high-pressure air generating source are configured separately, but the oil mist generating device and the high-pressure air generating source are integrally formed to separate the oil mist and the high-pressure air. An injection nozzle may be connected to the tip of the tube that is selectively circulated.

FIGS. 7 to 9 show modified examples of the injection nozzle holding mechanism 26 in which the number of servomotors is reduced and the structure is simplified. That is, in the injection nozzle holding mechanism 26, the two pulleys 48 and 58 are fixed to the pivot 44 fixed to the base of the second arm 32, and the pivot 44 and the two pulleys 48 and 58 rotate integrally. The belt 62 is stretched between the pulley 58 and the shaft 90 loosely fitted to the tip of the second arm 32, and the holder 92 is rotated on the shaft 90 integrally with the shaft 90. The holder 92 holds a shaft portion 96 of a chuck 94 for detachably holding the spray nozzle 24. Other configurations are the same as those in the above embodiments.

According to the injection nozzle holding mechanism 26, the rotation of the servomotor 40 for vertical movement causes the first arm 3
0 rotates up and down integrally with the second arm 32,
The rotation of the vertical movement auxiliary servomotor 42 causes the pivot 4
4 rotates and the second arm 32 rotates in the vertical direction, and at the same time, the shaft 90 relatively rotates with respect to the second arm 32 via the pulleys 58 and 60 and the belt 62, so that the injection nozzle 24 It is possible to move within the operation range A shown in FIG. 9 without changing its direction.

[0040]

As described above, according to the present invention,
This operation can be easily and safely performed by adjusting the injection position of the injection nozzle that injects the oil mist and removing cutting chips automatically instead of manually. Moreover, the oil mist can be sprayed toward the cut portion in a state that is optimal for the cutting process.

[Brief description of the drawings]

FIG. 1 is a perspective view of an oil mist injection device according to a first embodiment of the present invention and a machine tool including the device.

FIG. 2 is an enlarged view showing a main part of the mounting portion of the injection nozzle.

FIG. 3 is an enlarged front view showing the injection nozzle holding mechanism in an enlarged manner.

FIG. 4 is also a control block diagram.

FIG. 5 is a perspective view of an oil mist injection device according to a second embodiment of the present invention and a machine tool including the device.

FIG. 6 is a perspective view of the main part when the cutting process is interrupted and the cutting chips are removed.

FIG. 7 is a side view showing a modified example of the injection nozzle holding mechanism used in the oil mist injection device of the present invention.

FIG. 8 is also a front view.

FIG. 9 is a diagram attached to the description of the operation range.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Processing table 12,72 Work 14 Polishing tool (knife) 16 Machine tool 18 Oil mist generator 20,82,86 Tube 22 Oil mist 24 Injection nozzle 26 Injection nozzle holding mechanism 28 Control panel 30,32 Arm 40,42,52 , 64 Servo motors 46, 48, 58, 60 Pulleys 50, 62 Belt 66 Chuck 70 Drill (knife) 74 Cutting chips 80 High-pressure air source 84 Switching device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Ichihara 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Works Co., Ltd. Inside the company (72) Inventor Takao Suzuki 44 castings town, Yamagata City, Yamagata Prefecture Okura Seiki Co., Ltd.

Claims (6)

[Claims] An oil mist generator for generating an oil mist, an injection nozzle connected to a tip of a tube extending from the oil mist generator for injecting the oil mist toward a cutting portion, and vertically moving the injection nozzle And a controllable injection nozzle holding mechanism for swingably holding the oil mist. 2. An oil mist generating device for generating oil mist, a high pressure air generating source for generating high pressure air, and an oil mist or high pressure connected to a tip of a tube extending from the oil mist generating device and the high pressure air generating source. An oil mist injection device comprising: an injection nozzle for selectively injecting air toward a cutting portion; and a controllable injection nozzle holding mechanism for holding the injection nozzle vertically and swingably. 3. In controlling the oil mist injection device according to claim 1, the injection position of the injection nozzle with respect to the blade at the start of cutting is preset for each blade, and the injection is performed so that the injection nozzle is positioned at the set position. The cutting position is controlled by controlling the injection position of the injection nozzle via the nozzle holding mechanism, and the cutting state after the start of the cutting is monitored, and the vertical direction of the injection nozzle with respect to the blade is adjusted so as to match the preset cutting conditions. A control method for an oil mist injection device, wherein a relative position and a relative angle are controlled via the injection nozzle holding mechanism. 4. In controlling the oil mist injection device according to claim 2, the oil mist is injected from the injection nozzle so as to meet a predetermined cutting condition by monitoring a cutting condition periodically and / or. The oil mist injection device is switched to a high-pressure air injection for a predetermined time. 5. The injection nozzle according to claim 4, wherein when the high-pressure air is injected from the injection nozzle, the injection nozzle is swung or moved in the left and right and / or up and down directions via the injection nozzle holding mechanism. A method for controlling an injection nozzle injection device. 6. A cutting tool is temporarily stopped in the middle of the cutting processing to move the blade or the work, high-pressure air is jetted from the injection nozzle toward the work for a certain time, and the blade or the work is returned to the original position again. The method for controlling an oil mist injection device according to claim 4, wherein cutting is continued by cutting.