JP2024005401A - Chip removal tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chip removal tool which can be simplified in structure and operation.

SOLUTION: A chip removal tool 1 sucks and discharges chip 4 generated in a machine tool. The chip removal tool includes: a chuck section 10 which can be mounted in the machine tool; a magnetic core section 15 which is supported by the chuck section; an exciting coil 20 which excites the magnetic core section 15; and a power generation section 30 which supplies power to the exciting coil 20. The chip removal tool is mounted in the machine tool by the chuck section 10 and the magnetic core section 15 is brought close to a workpiece surface and a table surface by the machine tool. In this state, power from the power generation section 30 is supplied to the exciting coil 20, so that the magnetic core section 15 is magnetized and chip 4 deposited or attached to a surface of a workpiece or the like can be sucked.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a chip removal tool mounted on a machine tool.

In machine tools, chips are generated during machining and may accumulate on the workpiece.
In order to remove chips on a workpiece, the chips are washed away using cutting fluid, or the chips are blown away by blowing air.
However, in concave areas such as the backs of blind holes and narrow grooves, chips may not be sufficiently removed even when cutting fluid or air is used. If finishing is performed with chips remaining, the finished surface may be damaged.
In contrast, a chip removal tool has been proposed that uses magnetic force to attract and remove chips.

Patent Document 1 describes an electromagnetic chip removal tool. This chip removal tool is a tool attached to a main shaft, and has a coil that magnetizes the drill. Then, while the coil is energized to magnetize the drill, the drill is brought close to the workpiece to attract chips. Next, the power is turned off at a location away from the workpiece, and the chips are removed from the drill by rotating it.
In the chip removal tool of Patent Document 1, power for magnetizing the drill is supplied from the outside via an arm, a brush, and a pair of conductive rings.

Patent Document 2 describes a chip removal tool using a permanent magnet and an air cylinder. This chip removal tool improves the performance of removing chips from screw holes in particular.It has a cylindrical body that is attached to a machine tool, and can be moved behind the suction surface at the tip of the body. Contains a permanent magnet. When the permanent magnet is in close contact with the back side of the attraction surface, the magnetic force is applied to the attraction surface and chips can be attracted, and by separating the permanent magnet, the attraction on the attraction surface can be released.

Patent Document 3 describes a chip removal tool using a permanent magnet and a hook. This chip removal tool also has a permanent magnet on the back side of the suction surface, and the permanent magnet attracts the chips to the suction surface in close contact with the suction surface, and can release the suction by separating the chips. At this time, even when the permanent magnet is separated from the back side of the attraction surface, the magnetic force remains and the chips cannot be discharged sufficiently.In order to deal with this, we use a hook installed on the table to physically remove the chips. are doing.

Japanese Unexamined Patent Publication No. 150136/1983 JP2021-007987A Japanese Patent Application Publication No. 10-086031

The chip removal tool of Patent Document 1 requires a power distribution device such as an arm, a brush, and a pair of conductive rings in order to supply power to magnetize the drill, and an extension of the outside of the device is unavoidable. In addition, the structure is complicated due to the sliding conductive ring, etc., and maintenance work is unavoidably complicated.
On the other hand, in the chip removal tools of Patent Documents 2 and 3, permanent magnets are used for attraction, so equipment for power supply is not required. However, the operation for releasing the adhesion is complicated, and since the magnet is a permanent magnet, the adsorption force cannot be sufficiently released, and the operation of adsorbing and discharging chips may not be performed properly.

An object of the present invention is to provide a chip removal tool that is simple in structure and operation.

The present invention is a chip removal tool that adsorbs and discharges chips generated in a machine tool, and includes a chuck part that can be attached to the machine tool, a magnetic core part supported by the chuck part, and a chip removing tool that adsorbs and discharges chips generated in a machine tool. It includes an excitation coil that excites, and a power generation section that supplies power to the excitation coil.

In the present invention, the magnetic core is mounted on a machine tool using the chuck portion, and the magnetic core portion is brought close to the work surface or the table surface by the machine tool. In this state, the magnetic core is magnetized by supplying power from the power generation section to the excitation coil, and chips accumulated or attached to the surface of the work can be attracted. Alternatively, the magnetic core may be brought close to the chips in a state where the magnetic core is magnetized by electric power from the power generation section. Once the chips are adsorbed, the magnetic core is moved to a predetermined disposal container using a machine tool, and the power supply to the power generation section is stopped, thereby allowing the adsorbed chips to be discharged.
As described above, since the present invention uses an electromagnet composed of a magnetic core and an excitation coil to attract chips, it is possible to appropriately and easily switch between adsorption and release of chips. Further, since power to the excitation coil is supplied from a power generation section built into the tool, there is no need for an external power supply, and it is possible to prevent the outside of the tool from protruding.
In the present invention, the power generation section may be powered by center through air supplied from a machine tool, or powered by the rotation of the main shaft of a machine tool, for example.

In the chip removal tool of the present invention, it is preferable that the power generation section is driven by fluid supplied from the machine tool.
An example of a power generation unit incorporated in a tool is disclosed in Japanese Patent Application Laid-Open No. 2003-170328 by the applicant of the present application. A rectifier can be added to convert the generated AC power into DC power when feeding power from the power generation section to the excitation coil.

In the chip removal tool of the present invention, it is preferable that the fluid is center through air supplied through the main shaft of the machine tool.
According to the present invention, power can be generated using the center through air function that is installed in many machine tools, and the structure and operation can be simplified.

In the chip removal tool of the present invention, it is preferable that the power generation section is driven by rotation of the main shaft of the machine tool.
According to the present invention, power can be generated using the rotation of the main shaft of the machine tool, and the structure and operation can be simplified.

In the chip removal tool of the present invention, it is preferable that the magnetic core portion is supported in a floating manner in the axial direction.
According to the present invention, it is possible to protect the magnetic core from impact when it comes into contact with the surface of a workpiece or the like.
In the present invention, the magnetic core is not only placed close to the surface of the workpiece, but may also be introduced into a hole formed in the workpiece. At this time, it is unknown how much chips are accumulated inside the hole. When a lot of chips have accumulated in the hole, positioning the iron core near the bottom of the hole may compact the accumulated chips and cause the machine tool motor that moves the tool in the axial direction to overdrive. There is also the risk that the machine may become overloaded, causing inconveniences such as stopping the machine or damaging the tool. On the other hand, these inconveniences can be resolved by floating the magnetic core in the axial direction.
For floating support, a structure can be used in which the magnetic core is supported movably in the axial direction, and a coil spring or the like is arranged at the end to press it in the axial direction with a predetermined force. Further, by interposing an elastic member in the support portion of the magnetic core, the inclination of the magnetic core can be tolerated.

According to the present invention, it is possible to provide a chip removal tool that is simple in structure and operation.

FIG. 1 is a side view showing a first embodiment of the chip removal tool of the present invention. The side view which shows 2nd Embodiment of the chip removal tool of this invention. FIG. 7 is a side view showing a third embodiment of the chip removal tool of the present invention.

[First embodiment]
FIG. 1 shows a chip removal tool 1 according to a first embodiment of the present invention.
In Fig. 1, a chip removal tool 1 is used to adsorb and discharge chips 4 generated by a machine tool, and is attached to the main shaft 2 of the machine tool and can be moved to any position on or around the table of the machine tool. It is. The spindle 2 is supported by a spindle head 3 and can rotate R, and center through air A is supplied from the spindle head 3.

The chip removal tool 1 includes a chuck part 10 that can be mounted on a machine tool, a magnetic core part 15 supported by the chuck part 10, an excitation coil 20 that excites the magnetic core part 15, and a power generator that supplies power to the excitation coil 20. 30.

The chuck part 10 is similar to an existing tool holder, has a tapered shank connectable to the main shaft 2, and has a center through hole 11 along the rotation axis. Center through air A is supplied to the center through hole 11 through the main shaft 2.
A case 13 is connected to the chuck part 10 on the side opposite to the side on which the main shaft 2 is attached, a support part 14 is connected to the case 13, and a magnetic core part 15 is supported by the support part 14.

The magnetic core portion 15 is a bar made of a ferromagnetic material such as steel.
The support portion 14 has a support hole into which the magnetic core portion 15 can be inserted. The support hole of the support part 14 has a slightly larger diameter than the magnetic core part 15, and the magnetic core part 15 is movable in the axial direction with respect to the support part 14.
A coil spring 16 is installed at the innermost part of the support hole of the support part 14.
The coil spring 16 is compressed when the magnetic core 15 inserted into the support hole is pushed deep into the support hole, and the repulsive force allows the magnetic core 15 to return to its original position.
The magnetic core part 15 is floatingly supported on the support part 14 by the support holes of the support part 14 and the coil spring 16 so that it can be displaced in the axial direction.

The excitation coil 20 is installed around the support hole of the support part 14, is connected to the power generation part 30 via the wiring 21, and can excite the magnetic core part 15 by being supplied with power from the power generation part 30. be.

The power generation section 30 includes an air motor 31 and a generator 32 housed in a case 13.
The air motor 31 is rotated by center through air A from the center through hole 11 and can drive the generator 32.
The generator 32 is driven by the air motor 31 to generate electric power, and is capable of exciting the excitation coil 20 via the wiring 21 .

In the chip removal tool 1 of this embodiment, the chips 4 are removed by the following operations.
First, the chip removing tool 1 is attached to the main shaft 2 of the machine tool using the chuck section 10, and the magnetic core section 15 is brought close to the work surface or the table surface by operating each axis movement mechanism of the machine tool.
With the magnetic core section 15 in close proximity to the surface of the workpiece, center through air A is supplied from the machine tool, and electric power from the power generation section 30 is supplied to the excitation coil 20. The magnetic core portion 15 is magnetized by this electric power, and can adsorb chips 4 that have accumulated or adhered to the surface of a workpiece or the like. At this time, the magnetic core part 15 may be magnetized with electric power from the power generation section 30, and in this state, the magnetic core part 15 may be brought close to the chips 4 and adsorbed.
Once the chips 4 have been adsorbed, the magnetic core 15 is moved to a predetermined disposal container using a machine tool, and the power supply to the power generation unit 30 is stopped, so that the adsorption by the magnetic core 15 is released and the adsorbed chips 4 are removed. is discharged.

According to this embodiment, since the electromagnet composed of the magnetic core 15 and the excitation coil 20 is used to attract the chips 4, the adsorption and release of the chips 4 can be appropriately and easily switched.
Moreover, since the power to the excitation coil 20 is supplied from the power generation section 30 built into the chip removal tool 1, there is no need for an external power supply, and it is possible to prevent the chip removal tool 1 from protruding outward.

[Second embodiment]
FIG. 2 shows a chip removal tool 1A according to a second embodiment of the present invention.
The chip removal tool 1A of this embodiment has the same basic configuration as the chip removal tool 1 of the first embodiment described above. Therefore, redundant explanation of common configurations will be omitted, and different parts will be explained below.

The chip removal tool 1A of this embodiment includes a fixed case 17 in place of the case 13 of the first embodiment.
The fixed case 17 has a sub-shank 171 projecting from the side, and the sub-shank 171 can be connected to the receiving part 5 of the spindle head 3. Therefore, the rotation of the fixed case 17 with respect to the spindle head 3 is restricted by the subshank 171.

A core portion 41 extending from the chuck portion 10 is introduced into the fixed case 17 . The core portion 41 is connected to the main shaft 2 via the chuck portion 10 and is rotatable relative to the fixed case 17 as the main shaft 2 rotates.
The core portion 41 is formed of a permanent magnet, and a power generating coil 42 is arranged around the core portion 41 . A power generation section 40 is constituted by the core section 41 and the power generation coil 42.

In the power generation unit 40 , by rotating the main shaft 2 in the machine tool, the core unit 41 rotates to generate power in the power generation coil 42 , and the excitation coil 20 can be excited via the wiring 21 .
In this embodiment, the configurations of the support section 14, magnetic core section 15, excitation coil 20, and others are the same as those of the first embodiment described above.

In the chip removal tool 1A of this embodiment, the chips 4 are removed by the same operation as in the first embodiment described above, except that power is supplied from the power generation unit 40 by rotating the main shaft 2. be able to.
The chip removal tool 1A of this embodiment also provides the same effects as the first embodiment described above. Furthermore, since center through air A is not used, it can also be used in machine tools that do not have a center through air A supply function.

[Third embodiment]
FIG. 3 shows a chip removal tool 1B according to a third embodiment of the present invention.
The chip removal tool 1B of this embodiment has the same basic configuration as the chip removal tool 1 of the first embodiment described above. Therefore, redundant explanation of common configurations will be omitted, and different parts will be explained below.

In the first embodiment described above, the magnetic core part 15 was floatingly supported in the support hole of the support part 14 so as to be able to be displaced in the axial direction. On the other hand, in this embodiment, the magnetic core part 15 can be tilted with respect to the support part 14.
As shown in FIG. 3, a liner 18 of a predetermined thickness made of an elastomer material is stretched inside the support hole of the support portion 14. The excitation coil 20 is located outside the liner 18. Power may be supplied to the excitation coil 20 by the power generation section 30 driven by center through air A according to the first embodiment, or by the power generation section 40 driven by the rotation of the main shaft 2 according to the second embodiment. You can also use it as

In this embodiment, when the tip of the magnetic core part 15 is displaced in a direction intersecting the axial direction, the liner 18 is deformed and the inclination of the magnetic core part 15 can be tolerated.
Therefore, in addition to axial displacement of the magnetic core 15, inclination can be tolerated, and even when external force is applied to the magnetic core 15, the influence of the external force can be alleviated.

[Other embodiments]
Note that the present invention is not limited to the embodiments described above, and the present invention includes modifications within the scope that can achieve the purpose of the present invention.
In each of the embodiments described above, the excitation coil 20 is installed on the support section 14 to surround the magnetic core section 15, but the excitation coil 20 may be attached to a portion of the magnetic core section 15 that is exposed from the support section 14. .
In the first embodiment, the power generation unit 30 is driven by the center through air A, but other fluids may be used. For example, a liquid such as a coolant may be supplied from a center through hole, or air or liquid may be supplied through other piping.
In each of the embodiments described above, the magnetic core portion 15 has a simple rod shape, but it may have an appropriate shape such as having a rounded, thin, or flat tip. Floating support of the magnetic core portion 15 is not essential and may be omitted as appropriate.

INDUSTRIAL APPLICATION This invention can be utilized for the chip removal tool attached to a machine tool.

1, 1A, 1B... Chip removal tool, 2... Main spindle, 3... Main spindle head, 4... Chips, 5... Receiving part, 10... Chuck part, 11... Center through hole, 13... Case, 14... Support part, DESCRIPTION OF SYMBOLS 15... Magnetic core part, 16... Coil spring, 17... Fixed case, 18... Liner, 20... Excitation coil, 21... Wiring, 30... Power generation part, 31... Air motor, 32... Generator, 40... Power generation part, 41... Core Part, 42...Generating coil, 171...Sub shank, A...Center through air, R...Rotation.

Claims (5)

A chip removal tool that adsorbs and discharges chips generated by machine tools,
a chuck part that can be attached to the machine tool;
a magnetic core part supported by the chuck part;
A chip removal tool comprising: an excitation coil that excites the magnetic core; and a power generation section that supplies power to the excitation coil. The chip removal tool according to claim 1,
The power generation section is a chip removal tool driven by fluid supplied from the machine tool. The chip removal tool according to claim 2,
The fluid is center through air supplied through the main shaft of the machine tool. The chip removal tool according to claim 1,
The power generation section is a chip removal tool driven by rotation of the main shaft of the machine tool. The chip removal tool according to any one of claims 1 to 4,
In the chip removal tool, the magnetic core portion is floatingly supported in the axial direction.