Powder removal tool

Abstract

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

Description

Technical Field

[0001] The present invention relates to a chip removal tool attached to a machine tool.

Background Art

[0002] In a machine tool, chips are generated during machining and may accumulate on the workpiece. In order to remove the chips on the workpiece, the chips are washed away with cutting fluid or blown away with air. However, in concave portions such as blind holes and the depths of narrow grooves, the chips may not be sufficiently removed even when using cutting fluid or air. If finishing is performed with chips remaining, there is a possibility of damaging the finished surface. In contrast, a chip removal tool that adsorbs and removes chips by magnetic force has been proposed.

[0003] Patent Document 1 describes an electromagnetic chip removal tool. This chip removal tool is a tool attached to a spindle and has a coil for magnetizing a drill. Then, with the drill magnetized by energizing the coil, the drill is brought close to the workpiece to adsorb the chips. Next, after stopping the energization at a position away from the workpiece, the drill is rotated to remove the chips from the drill. In the chip removal tool of Patent Document 1, the power for magnetizing the drill is supplied from the outside via an arm, a brush, and a pair of conductive rings.

[0004] Patent Document 2 describes a chip removal tool using a permanent magnet and an air cylinder. This chip removal tool is particularly for improving the chip removal performance in a threaded hole, and has a cylindrical body attached to a machine tool, and a movable permanent magnet is housed behind the adsorption surface at the tip of the body. When the permanent magnet is in close contact with the back side of the adsorption surface, the magnetic force reaches the adsorption surface and can adsorb the chips, and the adsorption on the adsorption surface can be released by separating the permanent magnet.

[0005] 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 of the adsorption surface, and the chips are attracted to the adsorption surface when the permanent magnet is in close contact with it, and the adsorption can be released by separating them. However, in this case, the magnetic force remains even when the permanent magnet is separated from the back of the adsorption surface, and insufficient chip removal is prevented, so the chips are physically removed by a hook installed on the table. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 150136 / 1983 [Patent Document 2] Japanese Patent Publication No. 2021-007987 [Patent Document 3] Japanese Patent Application Publication No. 10-086031 [Overview of the project] [Problems that the invention aims to solve]

[0007] In the chip removal tool described in Patent Document 1, a power distribution device such as an arm, brush, and a pair of conductive rings is required to supply power to magnetize the drill, and it is unavoidable that these components protrude from the outside of the device. Furthermore, the complexity of the structure, such as the presence of sliding conductive rings, and the resulting cumbersome maintenance work are unavoidable. On the other hand, the chip removal tools described in Patent Documents 2 and 3 use permanent magnets for attraction, thus eliminating the need for power supply equipment. However, the operation to release the attraction is complicated, and because permanent magnets are used, the attraction force cannot be fully released, sometimes resulting in improper chip attraction and discharge.

[0008] The object of the present invention is to provide a chip removal tool that has a simple structure and operation. [Means for solving the problem]

[0009] The present invention relates to a chip removal tool for adsorbing and discharging chips generated by a machine tool, comprising: a chuck portion that can be attached to the machine tool; a magnetic core portion supported by the chuck portion; an excitation coil for exciting the magnetic core portion; and a power generation unit for supplying power to the excitation coil.

[0010] In this invention, the magnetic core is mounted on a machine tool using a chuck, and the machine tool brings the magnetic core close to the workpiece surface or table surface. In this state, power from the power generation unit is supplied to the excitation coil, which magnetizes the magnetic core, allowing it to attract chips accumulated or attached to the surface of the workpiece or other objects. Alternatively, the magnetic core may be magnetized using power from the power generation unit, and then brought close to the chips. Once the chips have been attracted, the magnetic core can be moved to a designated waste container or the like using the machine tool, and the power supply from the power generation unit can be stopped to discharge the attracted chips. Thus, in this invention, an electromagnet composed of a magnetic core and an excitation coil is used to attract chips, allowing for appropriate and easy switching between attracting and releasing chips. Furthermore, since power to the excitation coil is supplied from a power generation unit built into the tool, an external power supply is unnecessary, preventing the tool from protruding outwards. In the present invention, the power generation unit can be, for example, one that uses center-through air supplied from a machine tool as power, or one that utilizes the rotation of the spindle of a machine tool.

[0011] In the chip removal tool of the present invention, it is preferable that the power generation unit is driven by a fluid supplied from the machine tool. An example of a power generation unit incorporated into a tool is shown in Japanese Patent Publication No. 2003-170328 by the present applicant. When supplying power from the power generation unit to the excitation coil, a rectifier can be added to convert the generated AC power into DC power.

[0012] In the chip removal tool of the present invention, the fluid is preferably center-through air supplied through the spindle of the machine tool. In this invention, power can be generated using the center-through air function equipped in many machine tools, and the structure and operation can be simplified.

[0013] In the chip removal tool of the present invention, it is preferable that the power generation unit is driven by the rotation of the spindle of the machine tool. In this invention, power can be generated by utilizing the rotation of the spindle of a machine tool, and the structure and operation can be simplified.

[0014] In the chip removal tool of the present invention, it is preferable that the magnetic core is supported by floating in the axial direction. In this invention, the magnetic core can be protected from impact when it comes into contact with the surface of a workpiece or the like. In this invention, the magnetic core may be placed not only close to the workpiece surface but also introduced into a hole formed in the workpiece. In this case, the amount of chips accumulated inside the hole is unknown. If a large amount of chips has accumulated inside the hole, positioning the core near the bottom of the hole may compress the accumulated chips, and may also cause problems such as the motor of the machine tool that moves the tool axially to overload, causing the machine to stop or the tool to be damaged. These problems can be eliminated by having the magnetic core floating in the axial direction. For floating support, a structure can be used in which the magnetic core is supported so as to be movable in the axial direction, and a coil spring or the like is placed at the end to press it in the axial direction with a predetermined force. In addition, by interposing an elastic member in the support part of the magnetic core, the tilt of the magnetic core can be tolerated. [Effects of the Invention]

[0015] According to the present invention, a chip removal tool with a simple structure and operation can be provided. [Brief explanation of the drawing]

[0016] [Figure 1] A side view showing a first embodiment of the chip removal tool of the present invention. [Figure 2] Side view showing the second embodiment of the swarf removal tool of the present invention. [Figure 3] Side view showing the third embodiment of the swarf removal tool of the present invention.

Embodiments for Carrying Out the Invention

[0017] 〔First Embodiment〕 In FIG. 1, a swarf removal tool 1 according to the first embodiment of the present invention is shown. In FIG. 1, the swarf removal tool 1 adsorbs and discharges swarf 4 generated by a machine tool. It is attached to the spindle 2 of the machine tool and is movable to an arbitrary position on or around the table of the machine tool. The spindle 2 is supported by the spindle head 3 and is capable of rotation R, and center-through air A is supplied from the spindle head 3.

[0018] The swarf removal tool 1 includes a chuck portion 10 that can be attached to a machine tool, a magnetic core portion 15 supported by the chuck portion 10, an exciting coil 20 that excites the magnetic core portion 15, and a power generation portion 30 that supplies power to the exciting coil 20.

[0019] The chuck portion 10 is similar to an existing tool holder, has a tapered shank that can be connected to the spindle 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 spindle 2. A case 13 is connected to the chuck portion 10 on the side opposite to the side attached to the spindle 2. A support portion 14 is connected to the case 13, and the magnetic core portion 15 is supported by the support portion 14.

[0020] 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 portion 14 has a slightly larger diameter than the magnetic core portion 15, and the magnetic core portion 15 is movable in the axial direction with respect to the support portion 14. A coil spring 16 is installed at the innermost part of the support hole of the support portion 14. The coil spring 16 is compressed when the magnetic core 15 inserted into the support hole is pushed all the way to the back of the support hole, and the repulsive force allows the magnetic core 15 to return to its original position. The magnetic core 15 is floating and supported by the support holes and coil springs 16 of these support parts 14 so as to be displaceable in the axial direction.

[0021] The excitation coil 20 is installed around the support hole of the support part 14 and is connected to the power generation unit 30 via wiring 21, and the magnetic core part 15 can be excited by power supplied from the power generation unit 30.

[0022] The power generation unit 30 consists of an air motor 31 and a generator 32 housed in a case 13. The air motor 31 rotates using the 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 electricity and can excite the excitation coil 20 via the wiring 21.

[0023] In the chip removal tool 1 of this embodiment, chips 4 are removed by the following operation. First, the chip removal tool 1 is attached to the spindle 2 of the machine tool using the chuck 10, and the magnetic core 15 is brought close to the workpiece surface or table surface by operating the axis movement mechanism of the machine tool. With the magnetic core 15 in close proximity to the surface of a workpiece or the like, center-through air A is supplied from the machine tool, and power from the power generation unit 30 is supplied to the excitation coil 20. This power magnetizes the magnetic core 15, allowing it to attract chips 4 that have accumulated or adhered to the surface of the workpiece or the like. Alternatively, the magnetic core 15 may be magnetized using power from the power generation unit 30 beforehand, and then brought in close proximity to the chips 4 to attract them. Once the chips 4 are attracted, the magnetic core 15 is moved to a designated waste container or the like by the machine tool, and the power supply to the power generation unit 30 is stopped, releasing the attraction by the magnetic core 15 and discharging the attracted chips 4.

[0024] According to this embodiment, since an electromagnet composed of a magnetic core 15 and an excitation coil 20 is used to attract the chips 4, the attraction and release of the chips 4 can be switched appropriately and easily. Furthermore, since the power to the excitation coil 20 is supplied from the power generation unit 30 built into the chip removal tool 1, an external power supply is unnecessary, and the chip removal tool 1 can be prevented from protruding outwards.

[0025] [Second Embodiment] Figure 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 explanations of the common components will be omitted, and the differences will be described below.

[0026] In this embodiment, the chip removal tool 1A is equipped with a fixed case 17 instead of the case 13 of the first embodiment. The fixed case 17 has a sub-shank 171 that protrudes from its side, and the sub-shank 171 can be connected to the receiving portion 5 of the spindle head 3. Therefore, the rotation of the fixed case 17 relative to the spindle head 3 is restricted by the sub-shank 171.

[0027] 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 spindle 2 via the chuck portion 10 and is rotatable relative to the fixed case 17 as the spindle 2 rotates. The core portion 41 is formed from a permanent magnet, and a power generation coil 42 is arranged around it. The power generation unit 40 is composed of the core portion 41 and the power generation coil 42.

[0028] In a machine tool, the power generation unit 40 rotates the core 41 when the spindle 2 is rotated, generating electricity in the power generation coil 42, which can then excite the excitation coil 20 via the wiring 21. In this embodiment, the support portion 14, the magnetic core portion 15, the excitation coil 20, and other components are the same as in the first embodiment described above.

[0029] In the chip removal tool 1A of this embodiment, chips 4 can be 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 spindle 2. The chip removal tool 1A of this embodiment also provides the same effects as the first embodiment described above. Furthermore, since it does not use center-through air A, it can be used with machine tools that do not have a center-through air A supply function.

[0030] [Third Embodiment] Figure 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 explanations of the common components will be omitted, and the differences will be described below.

[0031] In the first embodiment described above, the magnetic core 15 was floatingly supported in the support hole of the support portion 14 so as to be displaceable in the axial direction. In contrast, in this embodiment, the magnetic core 15 is also capable of tilting relative to the support portion 14. As shown in Figure 3, a liner 18 of a predetermined thickness made of elastomer material is stretched inside the support hole of the support portion 14. The excitation coil 20 is positioned outside the liner 18. Power is supplied to the excitation coil 20 by a power generation unit 30 driven by center-through air A, as in the first embodiment, or by a power generation unit 40 driven by the rotation of the main shaft 2, as in the second embodiment.

[0032] In this embodiment, when the tip of the magnetic core 15 is displaced in a direction intersecting the axial direction, the liner 18 deforms, allowing the tilt of the magnetic core 15 to be tolerated. Therefore, in addition to axial displacement of the magnetic core 15, tilt can also be tolerated, and the effects of external forces applied to the magnetic core 15 can be mitigated.

[0033] [Other embodiments] It should be noted that the present invention is not limited to the embodiments described above, and any modifications that can achieve the objectives of the present invention are included in the present invention. In each of the above embodiments, the excitation coil 20 is installed on the support portion 14 to surround the magnetic core portion 15, but the excitation coil 20 may also be attached to the portion of the magnetic core portion 15 that is exposed from the support portion 14. In the first embodiment described above, the power generation unit 30 was driven by center-through air A, but other fluids may be used. For example, it may be a liquid such as coolant supplied through the center-through hole, or air or liquid may be supplied by other piping. In the embodiments described above, the magnetic core 15 is a simple rod shape, but it can be made into any shape as appropriate, such as by rounding the tip, making it thinner, or flattening it. Floating support for the magnetic core 15 is not essential and may be omitted as appropriate. [Industrial applicability]

[0034] This invention can be used in a chip removal tool that is attached to a machine tool. [Explanation of symbols]

[0035] 1,1A,1B...chip removal tool, 2...spindle, 3...spindle head, 4...chips, 5...receiving part, 10...chuck part, 11...center through hole, 13...case, 14...support part, 15...magnetic core part, 16...coil spring, 17...fixed case, 18...liner, 20...excitation coil, 21...wiring, 30...generator part, 31...air motor, 32...generator, 40...generator part, 41...core part, 42...generator coil, 171...subshank, A...center through air, R...rotation.

Claims

1. A chip removal tool that adsorbs and discharges chips generated by machine tools, A chuck portion that can be attached to the aforementioned machine tool, A magnetic core supported by a support connected to the chuck portion, An excitation coil for exciting the magnetic core portion and The system includes a power generation unit that supplies power to the excitation coil, A chip removal tool wherein the magnetic core is supported in a support hole provided in the support portion so as to be displaceable in the axial direction, and an elastic member is provided inside the support hole.

2. In the chip removal tool described in Claim 1, The aforementioned elastic member is a chip removal tool, which is a liner made of an elastomer material.

3. In the chip removal tool described in claim 1, The power generation unit is a chip removal tool driven by a fluid supplied from the machine tool.

4. In the chip removal tool described in claim 3, The aforementioned fluid is a chip removal tool, which is center-through air supplied through the spindle of the machine tool.

5. In the chip removal tool described in claim 1, The power generation unit is a chip removal tool driven by the rotation of the spindle of the machine tool.

6. A chip removal tool according to any one of claims 1 to 5, The aforementioned magnetic core is a chip removal tool that is supported by floating in the axial direction.

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