Processing device

Abstract

The invention provides a processing apparatus. A machining device (10) is provided with a rotating shaft (20) rotatably supported by a housing (16), a rotating tool (12) detachably attached to the rotating shaft (20), an attachment (40), and a holder (50). The rotating tool (12) has a front end surface (300) facing in a first direction along the axial direction of the rotating shaft (20), and a rear end surface (302) facing in a second direction opposite to the first direction. The attachment (40) is detachably connected to the front end surface (300) of the rotary tool (12). The bracket (50) rotatably supports the attachment (40) in a state of being supported by the housing (16). Therefore, the dimensional accuracy of a processed product can be improved.

Description

Technical Field

[0001] This invention relates to a processing apparatus. Background Technology

[0002] Grinding devices are known as processing apparatuses. Grinding wheels for gears have helical grinding sections on their sides. These grinding sections are used to grind the tooth surfaces of the gears.

[0003] In the structure disclosed in Japanese Patent Publication No. 2021-79475, both ends of the rotating shaft in the axial direction are supported by specified support members. That is, the support for the rotating shaft is a so-called two-end support. On the other hand, Japanese Patent Publication No. Hei 5-208314 shows a structure in which one end of the rotating shaft in the axial direction is supported to a rotary motor. In this case, the grinding wheel is detachably mounted to the other end of the rotating shaft in the axial direction. Therefore, the support for the rotating shaft is a so-called cantilever support. Summary of the Invention

[0004] In either end-supported or cantilevered supports, the grinding wheel may vibrate radially when the workpiece comes into contact with it. If vibration cannot be adequately suppressed, or in other words, if the vibration amplitude is large, there is a concern about reduced dimensional accuracy of the workpiece.

[0005] The purpose of this invention is to solve the above-mentioned technical problems.

[0006] The present invention provides a processing apparatus having a rotating shaft and a rotating tool, wherein the rotating shaft is rotatably supported on a housing; the rotating tool is cylindrical and detachably mounted on the rotating shaft, the rotating shaft having a protruding end that protrudes from the housing in a first direction along the axial direction of the rotating shaft for mounting the rotating tool, the rotating tool having a front end face and a rear end face, wherein the front end face is formed at the end of the rotating tool in the first direction and faces the first direction; the rear end face is formed at the end of the rotating tool in a second direction opposite to the first direction and faces the second direction, the processing apparatus having an attachment and a bracket, wherein the attachment is detachably connected to the front end face of the rotating tool; the bracket is supported on the housing and rotatably supports the attachment.

[0007] According to the present invention, radial vibration of the rotating tool can be suppressed. Therefore, the dimensional accuracy of the machined products can be improved.

[0008] The above-described objectives, features, and advantages should be readily understood from the following description of the embodiments with reference to the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a side sectional view of the main part of the processing apparatus (grinding apparatus) according to the embodiments of the present invention.

[0010] Figure 2 This is a schematic diagram illustrating the structure of an electroplating grinding wheel.

[0011] Figure 3 This is an enlarged view of the main part showing the grinding process performed on the teeth of a gear by a grinding wheel. Detailed Implementation

[0012] In the embodiments described below, Figure 1 The processing device 10 shown is used for processing... Figure 3 This section illustrates an example of a grinding apparatus 10A used to grind the teeth T of the gear G shown. In this case, Figure 1 The rotary tool 12 shown is a grinding wheel 30. However, the machining apparatus 10 is not limited to the grinding apparatus 10A. The machining apparatus 10 can also be an apparatus for performing machining other than grinding. Therefore, the rotary tool 12 is not limited to the grinding wheel 30. In addition, the grinding apparatus 10A is not limited to a gear grinding apparatus. The grinding apparatus 10A can also be an apparatus for grinding other workpieces.

[0013] Furthermore, when simply referred to as "axial direction" below, "axial direction" refers to "the axial direction of the rotating shaft 20". The axial direction of the rotating shaft 20 refers to the direction parallel to the central axis L of the rotating shaft 20. Also, "the direction along the radial direction of the rotating shaft 20" will be simply referred to as "radial direction". Additionally, the radial direction of the rotating shaft 20 coincides with the radial direction of the grinding wheel 30. Therefore, "radial direction" can also refer to "the direction along the radial direction of the grinding wheel 30".

[0014] Figure 1 This is a side sectional view of the main part of the grinding apparatus 10A. The grinding apparatus 10A has a housing 16 and a rotating shaft 20 rotatably supported on the housing 16. Additionally, Figure 1 The viewpoint is radially orthogonal to the central axis L (or axial direction) of the rotation axis 20.

[0015] The rotating shaft 20 has a shaft body 200 and a retaining portion 210. The shaft body 200 is received in a shaft hole 100 formed in the housing 16. A housing-side bearing 110 is located between the side circumferential surface of the shaft body 200 and the inner circumferential surface of the shaft hole 100. The housing-side bearing 110 is, for example, a ball bearing, but is not limited to a ball bearing.

[0016] The axial direction, i.e., the direction from the inside of the housing 16 towards the outside (from the shaft body 200 towards the retaining portion 210), is referred to as the first direction. The opposite direction of the first direction is referred to as the second direction. A fitting recess 204 that is recessed in the second direction is formed at the first end 202 of the shaft body 200 facing the first direction. The second end (not shown) of the shaft body 200 facing the second direction is connected to the output shaft of a rotary motor (not shown). As the rotary motor drives the output shaft to rotate, the rotating shaft 20 rotates around the central axis L.

[0017] The retaining portion 210 has a flange portion 212, a fitting protrusion 214, and a columnar protrusion 216. A mounting hole 218 for forming the first mating portion 230 is formed in the flange portion 212. The fitting protrusion 214 extends from the end face of the flange portion 212 toward the second direction. The columnar protrusion 216 extends from the end face of the flange portion 212 toward the first direction. The portion of the columnar protrusion 216 located in the first through hole 316 is a tapered portion 220 that tapers in diameter as it moves from the second direction toward the first direction.

[0018] The fitting protrusion 214 engages with the fitting recess 204 of the shaft body 200. Furthermore, the retaining portion 210 and the first end portion 202 of the shaft body 200 are connected by bolts (not shown). In this state, the flange portion 212 and the columnar protrusion 216 are located outside the housing 16 (outside the shaft hole 100). Therefore, the end of the rotating shaft 20 facing the first direction protrudes from the housing 16 (shaft hole 100). Hereinafter, this end will be referred to as the "protruding end 22".

[0019] The grinding wheel 30 is detachably mounted on the retaining part 210. In a preferred embodiment, the grinding wheel 30 is an electroplated grinding wheel 30A. Figure 2 As shown, the electroplated grinding wheel 30A has a substrate 32 made of a metallic material and abrasive grains 34. The abrasive grains 34 are, for example, diamond abrasive grains. The abrasive grains 34 are fixed to the outer surface of the substrate 32 by a plating layer 36 (electroplated layer). In this manner, the abrasive grains can be easily formed on the grinding wheel 30 through machining. Figure 1 The connecting hole 342 shown is described later. This is due to the substrate 32 (see reference). Figure 2 It is made of metal material, so the substrate 32 is easy to process in various ways.

[0020] However, the grinding wheel 30 is not limited to the electroplated grinding wheel 30A. The grinding wheel 30 can also be a sintered grinding wheel formed by sintering abrasive grains 34 (e.g., diamond abrasive grains).

[0021] like Figure 1As shown, the grinding wheel 30 has a hollow cylindrical body 313 with openings at both ends in the axial direction, and a partition wall portion 314 provided to separate the hollow interior of the cylindrical body 313. The grinding wheel 30 is formed into a cylindrical shape by the cylindrical body 313 and the partition wall portion 314. The cylindrical body 313 is the outer peripheral portion located on the outer peripheral side of the partition wall portion 314, and the partition wall portion 314 is the inner peripheral portion located on the inner peripheral side of the cylindrical body 313.

[0022] The cylindrical body 313 has a front end face 300, a rear end face 302, and an outer peripheral face 304. The front end face 300 is the bottom surface of the grinding wheel 30 facing a first direction. The rear end face 302 is the bottom surface of the grinding wheel 30 facing a second direction. The grinding wheel 30 has a front recess 310 that is recessed from the front end face 300 to the rear end face 302. When the grinding wheel 30 is viewed axially, the front end face 300 has an annular shape (see reference). Figure 3 The grinding wheel 30 has a rear recess 312 that is recessed from the rear end face 302 toward the front end face 300. When the grinding wheel 30 is viewed axially, the rear end face 302 and the front end face 300 are both annular in shape. In the example shown, the inner diameter of the rear recess 312 is larger than the inner diameter of the front recess 310.

[0023] The hollow interior of the cylindrical body 313 is divided into a front recess 310 and a rear recess 312 by a partition wall 314. The partition wall 314 has a first through hole 316 and a second through hole 318. The first through hole 316 and the second through hole 318 extend along the axial direction of the rotation axis 20 and penetrate the partition wall 314.

[0024] The first through hole 316 is formed in the portion of the partition wall portion 314 through which the central axis L of the rotating shaft 20 passes. The central axis L of the rotating shaft 20 coincides with the central axis of the first through hole 316. A columnar protrusion 216 in the protruding end 22 passes through the first through hole 316. The tapered portion 220 of the columnar protrusion 216 is located in the first through hole 316. Therefore, the first through hole 316 is a tapered hole corresponding to the shape of the tapered portion 220. The first end of the columnar protrusion 216 in the first direction is located within the front recess 310.

[0025] The second through hole 318 is formed at a position radially outward from the central axis L of the rotation shaft 20. The second through hole 318, together with the mounting hole 218 and the mounting member 330, forms the first engagement portion 230. Specifically, the flange portion 212 in the protruding end 22 is inserted into the rear recess 312. With the second through hole 318 and the mounting hole 218 aligned, the mounting member 330 passes through the second through hole 318. The mounting member 330 is, for example, a mounting bolt 332. In this case, a threaded portion (not shown) is formed on the inner surface of the mounting hole 218. As the mounting bolt 332 engages with the threaded portion, the grinding wheel 30 is engaged with the rotation shaft 20 through the first engagement portion 230. As thus understood, the support of the grinding wheel 30 on the rotation shaft 20 is a cantilever support.

[0026] To ensure a secure connection between the rotating shaft 20 and the grinding wheel 30, it is preferable to provide multiple first engagement portions 230 on both the rotating shaft 20 and the grinding wheel 30. However, if a single first engagement portion 230 is sufficient to suppress the relative rotation of the rotating shaft 20 and the grinding wheel 30, then a single first engagement portion 230 may also be used.

[0027] An annular groove 320 in the shape of an annulus is formed on the rear end face 302 of the grinding wheel 30. On the other hand, an annular protrusion 104 in the shape of an annulus is provided on the front end face 102 of the housing 16 facing the first direction. The annular protrusion 104 is inserted into the annular groove 320. Accordingly, foreign matter (grinding fluid, etc.) is prevented from entering the rear recess 312 through the gap between the rear end face 302 of the grinding wheel 30 and the front end face 102 of the housing 16. The annular protrusion 104 can also be separated from the inner surface of the annular groove 320. However, the annular protrusion 104 can also slide in contact with the inner surface of the annular groove 320 when the grinding wheel 30 rotates.

[0028] The grinding wheel 30 has a connecting hole 342 forming a second engagement portion 340. The connecting hole 342 is formed on the front end face 300 of the grinding wheel 30. A connector 430 for detachably connecting an accessory 40 (described later) is inserted into the connecting hole 342. The connector 430 is, for example, a connecting bolt 432. In this case, a threaded portion is provided on the inner surface of the connecting hole 342. The second engagement portion 340 is located on the first direction side relative to the first engagement portion 230.

[0029] The grinding wheel 30 has a grinding section 306 on its outer peripheral surface 304. In the case where the processing device 10 is a grinding device 10A, the grinding section 306 is helical in shape.

[0030] The grinding apparatus 10A also includes an attachment 40. The attachment 40 has a base 400 that is approximately circular in shape. Hereinafter, the end face of the base 400 facing the first direction will be referred to as the "main face 402", and the end face of the base 400 facing the second direction will be referred to as the "back face 404". The back face 404 faces the front face 300 of the grinding wheel 30.

[0031] The base 400 has a stepped hole 406. The stepped hole 406, together with the connector 430, forms a second engagement portion 340. Specifically, the stepped hole 406 is formed in the base 400 at a portion that avoids the main face side protrusion 408 and the back face side protrusion 410, extending axially and penetrating the base 400. The main body of the connecting bolt 432, which serves as the connector 430, passes through the stepped hole 406. The connecting bolt 432 engages with the threaded portion of the connecting hole 342 of the grinding wheel 30. Simultaneously, the accessory 40 is connected to the front end face 300 of the grinding wheel 30 via the second engagement portion 340. The head of the connecting bolt 432 is received in the stepped hole 406. By loosening the connecting bolt 432 relative to the connecting hole 342, the accessory 40 is removed from the grinding wheel 30. This allows the accessory 40 to be attached to and detached from the grinding wheel 30.

[0032] To ensure a secure connection between the grinding wheel 30 and the accessory 40, it is preferable to provide a plurality of second engagement portions 340 on both the grinding wheel 30 and the accessory 40. In one embodiment, the plurality of second engagement portions 340 are located radially outward from the plurality of first engagement portions 230. In this case, radial vibration of the grinding wheel 30 can be sufficiently suppressed. Alternatively, the plurality of second engagement portions 340 may also be located radially inward from the plurality of first engagement portions 230. Alternatively, some of the second engagement portions 340 may be located radially outward from some of the first engagement portions 230, and the remaining second engagement portions 340 may be located radially inward from the remaining first engagement portions 230.

[0033] However, if the relative rotation of the attachment 40 and the grinding wheel 30 can be suppressed using only one second joint 340, then there can be only one second joint 340. In this case, it is also preferable to provide the second joint 340 on the radially outer side of the first joint 230, but this is not necessary.

[0034] A generally circular plate-shaped main surface protrusion 408 protrudes from the main surface 402 of the base 400, and a generally circular plate-shaped rear surface protrusion 410 protrudes from the rear surface 404 of the base 400. The protrusion direction of the main surface protrusion 408 is a first direction, and the protrusion direction of the rear surface protrusion 410 is a second direction. The diameter of the rear surface protrusion 410 is larger than the diameter of the main surface protrusion 408.

[0035] The back side protrusion 410 engages with the front side recess 310 of the grinding wheel 30. The side surface of the back side protrusion 410, for example, abuts against the inner circumferential surface of the front side recess 310. However, the side surface of the back side protrusion 410 does not necessarily abut against the inner circumferential surface of the front side recess 310. A clearance recess 412 is formed at the center of the back side protrusion 410. The clearance recess 412 prevents interference between the back side protrusion 410 and the columnar protrusion 216.

[0036] Annex 40 also includes an auxiliary rotating shaft portion 420. The auxiliary rotating shaft portion 420 extends in a manner that protrudes from the main surface side protrusion 408 along a first direction. The auxiliary rotating shaft portion 420 and the rotating shaft 20 are coaxial with each other. Therefore, when the grinding apparatus 10A is viewed from the axial direction of the rotating shaft 20, the central axis M of the auxiliary rotating shaft portion 420 and the central axis L of the rotating shaft 20 are approximately coincident. In other words, the offset between the central axis M of the auxiliary rotating shaft portion 420 and the central axis L of the rotating shaft 20 is within an acceptable range.

[0037] The auxiliary rotating shaft portion 420 has a tapered portion 422 that gradually tapers in diameter as it moves from the second direction toward the first direction, and a constant-diameter portion 424. The tapered portion 422 is closer to the base 400 than the constant-diameter portion 424. A threaded portion 426 is provided on the side of the auxiliary rotating shaft portion 420.

[0038] As described above, the rotating shaft 20 and the grinding wheel 30 are joined together by the first joint 230, and the grinding wheel 30 and the accessory 40 are joined together by the second joint 340. Therefore, when the rotating shaft 20 rotates, the grinding wheel 30 and the accessory 40 rotate integrally with the rotating shaft 20.

[0039] The grinding apparatus 10A also includes a support 50. One end of the support 50 in the radial direction along the rotation axis 20 is supported on the housing 16. In other words, the support 50 is securely positioned and fixed to the housing 16. This prevents the support 50 from vibrating.

[0040] The bracket 50 has an insertion hole 500 extending axially along the rotation axis 20. A bracket-side bearing 502 (bearing) is provided within the insertion hole 500. The auxiliary rotation shaft portion 420 of the accessory 40 is inserted into the insertion hole 500 and passes through the bracket-side bearing 502. Therefore, the bracket-side bearing 502 is located between the side surface of the auxiliary rotation shaft portion 420 and the inner surface of the insertion hole 500. Accordingly, the accessory 40 is rotatably supported on the bracket 50. The bracket-side bearing 502 is located at the tapered portion 422 of the auxiliary rotation shaft portion 420.

[0041] In the example shown, the support-side bearing 502 is a cylindrical roller bearing 502A. The cylindrical roller bearing 502A has a high load-bearing capacity for radially acting loads. Therefore, it can effectively suppress radial vibration of the auxiliary rotating shaft 420. However, the support-side bearing 502 is not limited to a cylindrical roller bearing 502A. The support-side bearing 502 can also be other roller bearings such as needle roller bearings. Alternatively, the support-side bearing 502 can also be a ball bearing.

[0042] The grinding apparatus 10A has a first sealing member 510 and a second sealing member 512. The first sealing member 510 and the second sealing member 512 have a so-called labyrinth seal structure. Within the insertion hole 500, the first sealing member 510 is positioned further in a first direction than the support-side bearing 502, and the second sealing member 512 is positioned further in a second direction than the support-side bearing 502. The support-side bearing 502 is located between the first gasket 524 and the second gasket 526. The first sealing member 510 and the second sealing member 512 prevent foreign objects from entering the insertion hole 500.

[0043] The grinding apparatus 10A includes a fastener 520. In the example shown, the fastener 520 includes a nut 522, a first washer 524, and a second washer 526. The nut 522 is screwed into a threaded portion 426. The first end of the first washer 524 protrudes from an insertion hole 500, and the second end of the first washer 524 is inserted into the insertion hole 500 and abuts against a first sealing member 510. The second washer 526 is located, for example, outside the insertion hole 500. The first end of the second washer 526 can abut against a second sealing member 512. The second end of the second washer 526 can abut against a main surface side protrusion 408.

[0044] The manufacturing method of the grinding apparatus 10A configured as described above will be briefly explained. First, for the grinding wheel 30 in its detached state from the rotating shaft 20, a connecting hole 342 is formed on the front end face 300 by machining (e.g., drilling). When the grinding wheel 30 is... Figure 2 In the case of the electroplated grinding wheel 30A shown, since the substrate 32 is made of metal, it is easy to process the grinding wheel 30. In addition, when the grinding wheel 30 is a sintered grinding wheel, after forming the molded body with the connecting hole 342, the molded body is sintered.

[0045] Next, as Figure 1 As shown, with the flange portion 212 of the retaining portion 210 inserted into the rear recess 312 of the grinding wheel 30 and the columnar protrusion 216 of the retaining portion 210 passing through the first insertion hole 316 of the grinding wheel 30, the grinding wheel 30 is coupled to the retaining portion 210 of the rotating shaft 20 by the first coupling portion 230.

[0046] Next, the accessory 40 is connected to the front end face 300 of the grinding wheel 30 via the second connecting part 340. Furthermore, the auxiliary rotating shaft part 420 is passed through the insertion hole 500 of the bracket 50, connecting the bracket 50 to the housing 16. Accordingly, the bracket 50 is securely supported on the housing 16. Additionally, at this stage, the nut 522 is temporarily fixed to the threaded part 426.

[0047] Next, the nut 522 is rotated, causing it to move in the second direction along the auxiliary rotation shaft 420. As it rotates, the nut 522 moves in the second direction along the columnar protrusion 216. The nut 522, moving in the second direction, abuts against the first washer 524. As the nut 522 moves further in the second direction, the first washer 524 is pressed down by the nut 522 and moves in the second direction. Therefore, the first sealing member 510, the bracket-side bearing 502, the second sealing member 512, and the second washer 526 are pressed down by the first washer 524 and move in the second direction.

[0048] The second washer 526 stops by abutting against the main face side protrusion 408. Simultaneously, the first washer 524, the first sealing member 510, the bracket-side bearing 502, and the second sealing member 512 also stop. When the nut 522 is further rotated in this state, the bracket-side bearing 502 is tightened by the load applied to the first washer 524 and the second washer 526 by the nut 522 and the main face side protrusion 408.

[0049] This tightening tightens the inner ring 504 of the support-side bearing 502, causing it to expand slightly radially outward. Consequently, the clearance between the inner ring 504 and the outer ring 506 decreases. In some cases, the clearance almost disappears. When the support-side bearing 502 is a cylindrical roller bearing 502A, the radial rigidity of the support-side bearing 502 is increased by the aforementioned tightening.

[0050] Next, the operation of the grinding apparatus 10A will be explained. For example... Figure 3 As shown, the grinding device 10A is used to grind the teeth T of the gear G by means of the spiral grinding section 306 of the grinding wheel 30.

[0051] To perform the grinding process, gear G is held on a rotatable driven shaft (not shown), and the teeth T of gear G mesh with the grinding section 306 of grinding wheel 30. Next, grinding fluid (not shown) is supplied to the area being ground, and force is applied to the rotary motor. Accordingly, the rotating shaft 20 begins to rotate. Accompanying this rotation, grinding wheel 30 and accessories 40 (see reference 40) move. Figure 1 It rotates integrally with the rotating shaft 20.

[0052] Because the first sealing member 510 and the second sealing member 512 are inserted into the insertion hole 500 of the bracket 50, the ingress of grinding fluid into the insertion hole 500 is prevented. Furthermore, because the annular protrusion 104 is inserted into the annular groove 320, grinding fluid is prevented from seeping into the rear recess 312 from between the rear end face 302 of the grinding wheel 30 and the front end face 102 of the housing 16. The same applies to foreign matter other than grinding fluid (dust, etc.). Therefore, the bracket-side bearing 502 and the housing-side bearing 110 are protected.

[0053] As described above, the rotating shaft 20 and the auxiliary rotating shaft 420 are coaxial. In this state, the auxiliary rotating shaft 420 is supported by the bracket-side bearing 502. Furthermore, the bracket 50 is securely positioned and fixed to the housing 16. Therefore, as... Figure 3 As shown, when the teeth of gear G are in sliding contact with the grinding part 306 of grinding wheel 30, radial vibration of attachment 40 and grinding wheel 30 is suppressed.

[0054] When the support-side bearing 502 is a cylindrical roller bearing 502A, the cylindrical roller bearing 502A has a larger load-bearing capacity for radial loads. Furthermore, by tightening the fastener 520, the gap between the inner ring 504 and the outer ring 506 is almost eliminated. This further suppresses radial vibration of the accessory 40 and the grinding wheel 30.

[0055] For the reasons mentioned above, it is possible to avoid [problems] in gear G (refer to... Figure 3 The teeth T of the grinding wheel 30 have fine ripples due to the vibration of the grinding wheel 30.

[0056] If grinding wheel 30 is worn, it needs to be replaced with a new one. In this case, firstly, Figure 1 The bracket 50 shown is removed from the housing 16 and the accessory 40. Next, the accessory 40 is removed from the grinding wheel 30. Then, the grinding wheel 30 is removed from the holding part 210 of the rotating shaft 20. After this, a new grinding wheel 30 is installed in the holding part 210.

[0057] A cylindrical body covering the outer periphery of the grinding wheel 30 and the outer periphery of the accessory 40 can also be connected to the housing 16. This cylindrical body has a rotating shaft portion located offset from the central axis L of the rotation axis 20. The support 50 is supported by the rotating shaft portion. That is, in this case, the cylindrical body, accessory 40, and support 50 are modularly assembled. The support 50 is supported on the housing 16 by the cylindrical body.

[0058] In this structure, the bracket 50 and accessory 40 can be rotated integrally by removing the connector 430 (connecting bolt 432) from the connecting hole 342. The rotation center of the bracket 50 and accessory 40 is the rotating shaft. Through this rotation, the accessory 40 is separated from the grinding wheel 30. Therefore, when changing the grinding wheel 30, it is not necessary to remove the bracket 50 from the cylinder or the cylinder from the housing 16. Thus, the replacement of the grinding wheel 30 is easy.

[0059] This implementation method achieves the following effects.

[0060] like Figure 1 As shown, the grinding apparatus 10A has a grinding wheel 30 mounted on the protruding end 22 of the rotating shaft 20. An accessory 40 is mounted on the front end face 300 of the grinding wheel 30, and the accessory 40 is rotatably supported on a bracket 50 supported in the housing 16.

[0061] Based on this structure, radial vibration of attachment 40 and grinding wheel 30 is suppressed. Therefore, as a product, gear G (refer to...) Figure 3 The dimensional accuracy is improved.

[0062] like Figure 1 As shown, the second joint 340 that connects the grinding wheel 30 and the attachment 40 is positioned radially outward compared to the first joint 230 that connects the rotating shaft 20 and the grinding wheel 30. In this case, compared to the case where the first joint 230 is positioned radially outward compared to the case where the second joint 340 is positioned radially outward, the radial vibration of the attachment 40 and the grinding wheel 30 can be further suppressed.

[0063] Attachment 40 has an auxiliary rotating shaft portion 420. The auxiliary rotating shaft portion 420 and the rotating shaft 20 are coaxial. The bracket 50 has an insertion hole 500 for inserting the auxiliary rotating shaft portion 420. A bracket-side bearing 502 (bearing) is provided in the insertion hole 500. With this structure, attachment 40 can be rotatably supported on the bracket 50.

[0064] The support-side bearing 502 is axially positioned between the first sealing member 510 and the second sealing member 512. The first sealing member 510 and the second sealing member 512 seal the insertion hole 500, thus preventing foreign matter from entering the insertion hole 500. Therefore, for example, it prevents grinding fluid or the like supplied to the machining area during grinding from wetting the support-side bearing 502. In other words, it protects the support-side bearing 502 from the influence of grinding fluid or the like.

[0065] The support-side bearing 502 is fastened in both the first and second directions by fasteners 520. Accordingly, the support-side bearing 502 is less prone to radial vibration, thus further suppressing the vibration of the grinding wheel 30.

[0066] Fastener 520 includes a nut 522, a first washer 524, and a second washer 526. A bracket-side bearing 502 is axially positioned between the first washer 524 and the second washer 526. The first washer 524 and the second washer 526 secure the bracket-side bearing 502 by screwing the nut 522 into the threaded portion 426 of the auxiliary rotating shaft portion 420.

[0067] In this way, the bracket side bearing 502 sandwiched between the first washer 524 and the second washer 526 can be easily fastened by simply screwing the nut 522 into the threaded part 426.

[0068] In a preferred embodiment, the support-side bearing 502 is a cylindrical roller bearing 502A. The cylindrical roller bearing 502A has a greater load-bearing capacity for radial loads. Therefore, the auxiliary rotating shaft 420 supported by the cylindrical roller bearing 502A is less prone to radial vibration, thus further suppressing radial vibration of the grinding wheel 30. Furthermore, when the cylindrical roller bearing 502A is secured with fasteners 520, the clearance between the inner ring 504 and the outer ring 506 is reduced. Therefore, the attachment 40 is even less prone to radial vibration.

[0069] In a preferred embodiment, the grinding wheel 30 is characterized by having Figure 2 The electroplated grinding wheel 30A shown has a substrate 32 made of a metallic material. Because the substrate 32 is made of a metallic material, the grinding wheel 30 is easily machined to be attached to the accessory 40. For example, it is also easy to machine a connecting hole 342 into the front end face 300. Therefore, it is easy to attach the accessory 40 to an existing grinding wheel 30.

[0070] The grinding wheel 30, for example, has a helical grinding section 306 formed on its outer peripheral surface 304. The grinding section 306 grinds the teeth T of the gear G. In this case, it is possible to avoid the formation of fine ripples on the teeth T of the gear G.

[0071] The following notes are also disclosed regarding the above-described embodiments.

[0072] (Postscript 1) The processing apparatus (10) of the present invention has a rotating shaft (20) and a rotating tool (12), wherein the rotating shaft (20) is rotatably supported on a housing (16); the rotating tool (12) is cylindrical and is detachably mounted on the rotating shaft, the rotating shaft has a protruding end (22) that protrudes from the housing in a first direction along the axial direction of the rotating shaft for mounting the rotating tool, the rotating tool has a front end face (300) and a rear end face (302), wherein the front end face (300) is formed at the end of the rotating tool in the first direction and faces the first direction; the rear end face (302) is formed at the end of the rotating tool in a second direction opposite to the first direction and faces the second direction, the processing apparatus has an accessory (40) and a bracket (50), wherein the accessory (40) is detachably connected to the front end face of the rotating tool; the bracket (50) is supported on the housing and rotatably supports the accessory.

[0073] By using attachments and supports, radial vibration of the rotating tool is suppressed. Therefore, the dimensional accuracy of the machined products can be improved.

[0074] (Postscript 2) According to the processing apparatus described in Appendix 1, the rotating shaft and the rotating tool may also be connected by a first connecting part (230), and the rotating tool and the accessory may be connected by a second connecting part (340). In the radial direction of the rotating tool, the second connecting part is located at a position further outward than the first connecting part.

[0075] This structure can further suppress radial vibration of the rotating tool.

[0076] (Note 3) According to the processing apparatus described in Appendix 1, the accessory may also have an auxiliary rotating shaft (420) that extends in the first direction and is coaxial with the rotating shaft. The bracket has an insertion hole (500) and a bearing (502), wherein the insertion hole (500) is used to insert the auxiliary rotating shaft; and the bearing (502) is located between the side surface of the auxiliary rotating shaft and the inner surface of the insertion hole.

[0077] According to this structure, the attachments can be rotatably supported by the bracket.

[0078] (Postscript 4) According to the processing apparatus described in Appendix 3, it may also have a first sealing member (510) and a second sealing member (512), with the bearing located axially between the first sealing member and the second sealing member.

[0079] The insertion hole is sealed by the first and second sealing components. Therefore, foreign matter is prevented from entering the insertion hole. Thus, for example, it is possible to prevent the bearing from becoming wetted by coolant (e.g., grinding fluid) supplied to the machined part during machining.

[0080] (Note 5) According to Appendix 3 or 4, the processing apparatus may also include a fastener (520) capable of securing the bearing in both the first and second directions.

[0081] With the fasteners securing the bearing, it is less prone to radial vibration. Therefore, vibration of rotating tools can be further suppressed.

[0082] (Note 6) According to the processing apparatus described in Appendix 5, the fastener may also have a nut (522), a first washer (524) and a second washer (526), ​​the bearing is located between the first washer and the second washer in the axial direction, and the auxiliary rotating shaft has a threaded portion (426) on the side. As the nut engages with the threaded portion, the first washer and the second washer fasten the bearing.

[0083] In this case, the bearing sandwiched between the first and second washers can be easily tightened by simply screwing the nut into the threaded part.

[0084] (Note 7) According to any one of the appendices 3 to 6, the processing apparatus may also be a cylindrical roller bearing (502A).

[0085] Cylindrical roller bearings have a high load-bearing capacity in the radial direction. Therefore, accessories are less prone to radial vibration, further suppressing radial vibration in rotating tools. Furthermore, when cylindrical roller bearings are secured with fasteners, the clearance between the inner and outer rings is reduced. Therefore, accessories are even less prone to radial vibration.

[0086] (Postscript 8) According to any one of the appendices 1 to 7, the machining apparatus may also be a grinding wheel (30) or a grinding device (10A), wherein the rotating tool is a grinding wheel (30).

[0087] In this case, radial vibration of the grinding wheel is suppressed during grinding. As a result, the dimensional accuracy of the product obtained by grinding is improved.

[0088] (Note 9) According to the processing apparatus described in Appendix 8, the grinding wheel may also have a substrate (32) made of metal material and abrasive grains (34) fixed to the outer surface of the substrate.

[0089] Because the substrate is made of metal, the grinding wheel is easy to machine for attachment to accessories. For example, it is easy to machine a hole in the front face of the grinding wheel.

[0090] (Postscript 10) According to the processing apparatus described in Appendix 8 or 9, the grinding wheel may also have a grinding section (306) which is helical and formed on an outer peripheral surface (304) located between the front end face and the rear end face, the grinding section grinding the teeth (T) of the gear (G).

[0091] Therefore, it is possible to avoid the formation of fine ripples on the teeth of the gears.

[0092] The present invention has been described in detail, but it is not limited to the various embodiments described above. Various additions, substitutions, modifications, and partial deletions can be made to these embodiments without departing from the spirit of the invention or the spirit of the invention derived from the content described in the technical solutions and their equivalents. Furthermore, these embodiments can also be implemented in combination. For example, in the embodiments described above, the order of each action and the order of each process are shown as an example, but are not limited thereto. The same applies to the use of numerical values ​​or mathematical formulas in the description of the embodiments described above.

Claims

1. A machining device having a rotational axis and a rotational tool, wherein, The rotating shaft is rotatably supported by a housing; the rotating tool is in a cylindrical shape, and is detachably attached to the rotating shaft, The rotating shaft has a protruding end portion protruding from the housing in a first direction along an axial direction of the rotating shaft, for attaching the rotating tool, The rotating tool has a front end surface and a rear end surface, wherein the front end surface is formed at an end of the rotating tool in the first direction and faces the first direction; the rear end surface is formed at an end of the rotating tool in a second direction opposite to the first direction and faces the second direction, The processing device has an accessory and a support, wherein, The accessory is detachably connected to the front end surface of the rotating tool; and The support is supported by the housing and rotatably supports the accessory.

2. The processing device according to claim 1, wherein The rotating shaft and the rotating tool are combined by a first combining portion, The rotating tool and the accessory are combined by a second combining portion, In a radial direction of the rotating tool, the second combining portion is disposed at a position outward of the first combining portion.

3. The processing device according to claim 1, wherein The accessory has an auxiliary rotating shaft portion extending in the first direction and coaxial with the rotating shaft, The support has an insertion hole for the auxiliary rotating shaft portion to be inserted and a bearing interposed between a side surface of the auxiliary rotating shaft portion and an inner surface of the insertion hole.

4. The processing device according to claim 3, wherein There are a first sealing member and a second sealing member, and the bearing is interposed between the first sealing member and the second sealing member in the axial direction.

5. The processing device according to claim 3, wherein There is a fastener capable of fastening the bearing in both the first direction and the second direction.

6. The processing device according to claim 5, wherein The fastener has a nut, a first washer, and a second washer, and the bearing is interposed between the first washer and the second washer in the axial direction, The auxiliary rotating shaft portion has a threaded portion on a side surface, The first washer and the second washer fasten the bearing as the nut is screwed with the threaded portion.

7. The processing device according to any one of claims 3 to 6, wherein The bearing is a cylindrical roller bearing.

8. The processing device according to claim 1, wherein The rotating tool is a grinding wheel, and the processing device is a grinding device.

9. The processing device according to claim 8, wherein The grinding wheel has a base material made of a metal material and abrasive grains fixed to an outer surface of the base material.

10. The processing device according to claim 8 or 9, wherein The grinding wheel has a grinding portion in a helical shape formed on an outer peripheral surface between the front end surface and the rear end surface, The grinding portion grinds a tooth portion of a gear. ​

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