JP4457073B2 - Vertical double-sided surface grinding machine - Google Patents

Description

  The present invention relates to a dressing method in a vertical double-sided surface grinder provided with a pair of upper and lower grinding wheels that rotate about a vertical axis, for example, the disk portion of a workpiece integrally having a disk portion and a hub portion. The present invention relates to a dressing method in a vertical double-sided surface grinder suitable for grinding both the upper and lower surfaces of a steel sheet.

  Conventionally, when dressing a grinding wheel of a vertical double-sided surface grinding machine, a dressing device 110 incorporated in the surface grinding machine as shown in FIG. 8 is used, and the dressing attached to the dressing device 110 is used. The grinding stone 105 is dressed by the grinding stone 101.

  The dressing device 110 of FIG. 8 will be briefly described. The swing arm 100 is rotatably provided on the grinding machine, and the sharpening stone 101 is rotatably supported at the tip of the swing arm 100, and the other end of the swing arm 100 is provided. The part is connected to the rod 103 of the drive cylinder 102. The sharpening stone 101 is rotated by an oil motor or a transmission motor through an appropriate transmission mechanism (not shown).

  When dressing the upper and lower grinding wheels 105 with the dressing device 110, the swing arm 100 is rotated, the sharpening stone 101 is inserted between the upper and lower grinding wheels 105, and the sharpening stone 101 is rotated (rotated) and simultaneously ground. The grindstone 105 is also rotated, and the grinding grindstone 105 is moved up and down to dress the end face (grind surface) of the grindstone 105.

  Patent Document 1 listed below discloses a technique related to a method for dressing a grindstone of a double-head surface grinder.

Japanese Patent Laid-Open No. 09-070757

  In a vertical double-sided surface grinder, the parallelism and flatness of the grinding surfaces of the upper and lower grinding wheels and the parallelism of the workpiece by the workpiece holding jig are the conditions necessary for finishing the workpiece with high quality. When grinding a workpiece having a thin disk part such as a disk, the workpiece deflection is affected. Therefore, the parallelism of the abrasive surface and the workpiece is an extremely important factor for the grinding quality of the workpiece. It becomes.

  Dressing is performed to maintain the parallelism and flatness of the grinding surface. However, in the structure in which the sharpening stone 101 is cantilevered and supported by the swing arm 100 as shown in FIG. 8, the rigidity of the swing arm 100 is limited. For this reason, it becomes difficult to hold the sharpening grindstone 101 in a normal posture during long-term use, and it takes time to adjust the parallelism.

  Further, since the dressing device 110 including the swing arm 100 and the cylinder 102 is incorporated in the surface grinder, the entire surface grinder is increased in size and cost is increased.

In order to solve the above-described problems, a first invention includes a pair of upper and lower grinding wheels that rotate about a vertical axis, a work holding unit that holds a work in a predetermined position and can rotate about a vertical axis, and a work A vertical double-sided surface grinder that simultaneously grinds both the upper and lower surfaces by inserting the work held by the work holding part between the two grindstones. And a sharpening tool that is mounted on the workpiece holding portion in exchange, and the workpiece holding portion is connected to a workpiece having an annular disk and a hub portion so that the workpiece holding portion can A first reference surface comprising a circumferential surface concentric with the rotation axis of the workpiece holding portion; a second reference surface comprising a surface perpendicular to the rotation axis; However, the flange part is integrated. A cylindrical member, a disc-shaped sharpening grindstone, and an annular presser plate, and the outer peripheral surface of the lower part of the cylindrical member is a tool of the sharpening tool so that the sharpening tool fits into the work holding part A cylindrical surface concentric with the shaft core and fitted to the first reference surface, and a lower surface of the flange portion is a surface perpendicular to the tool axis and is in contact with the second reference surface; The sharpening wheel has a mounting hole in the center and the outer peripheral part is formed thick, and an annular protrusion is formed integrally on the outer periphery of the flange part. The mounting hole of the sharpening wheel is fitted to the outer periphery of the flange part. At the same time, the ring-shaped protrusion and the presser plate are brought into contact with the thin inner peripheral portion of the sharpening grindstone, and the bolt is inserted into the screw hole formed in the flange portion and the presser plate, so that the sharpening grindstone, the cylindrical member, and the presser plate are Are integrated and the sharpening wheel The upper and lower end surfaces of the thick outer peripheral part are parallel to each other, and these upper and lower end surfaces are used to move the upper and lower grinding wheels when the sharpening tool held by the work holding part is inserted between the two grinding wheels. It is a grinding surface to be dressed.

In the above SL first invention, the workpiece holding portion, and the rotation can be spin axis perpendicular axis around the work holding jig is fixed on the rotation axis, it is composed of, the workpiece holding jig , Having a first reference surface and a second reference surface.

The second invention is a pair of upper and lower grinding wheels that rotate about a vertical axis, a rotation shaft that holds a workpiece in a predetermined position and can rotate about a vertical axis, and is fixed on the rotation axis of the rotation shaft. A workpiece holding jig and a clamping device for fixing the workpiece to the workpiece holding jig, and by inserting the workpiece held by the workpiece holding portion between the two grinding wheels, the upper and lower end surfaces are simultaneously planarized. The vertical double-sided surface grinder to be ground is equipped with a sharpening tool that is attached to the rotation axis by replacing the workpiece and the workpiece holding jig, so that the rotation axis can be fitted to the workpiece holding jig, There are first and second reference surfaces for positioning the workpiece holding jig, the first reference surface is a circumferential surface concentric with the rotation axis, and the second reference surface is orthogonal to the rotation axis. It consists of a surface, and the sharpening tool has a flange part integrally A cylindrical member, a disc-shaped sharpening grindstone, and an annular presser plate are provided, and the inner peripheral surface of the lower part of the cylindrical member is a tool axis of the sharpening tool so that the sharpening tool fits to the rotation shaft. A cylindrical surface concentric with the core and fitted to the first reference surface, the lower surface of the cylindrical member being a surface perpendicular to the tool axis and contacting the second reference surface; The grindstone has a mounting hole in the center and the outer peripheral part is formed thick, and an annular projection is integrally formed on the outer periphery of the flange part, and the mounting hole of the sharpening grindstone is fitted to the outer periphery of the flange part. At the same time, the ring-shaped protrusion and the presser plate are brought into contact with the thin inner peripheral portion of the sharpening grindstone, and the bolt is inserted into the screw hole formed in the flange portion and the presser plate. Connected integrally, on the thick outer periphery of the sharpening wheel The end surfaces are parallel to each other, and the upper and lower end surfaces are abrasive surfaces that dress the upper and lower grinding wheels when the sharpening tool held by the work holder is inserted between the two grinding wheels. is there.

In the first or second invention, the clamping device has a steel ball for pressing the upper end of the cylindrical member of the sharpening tool.

Word over click holder fitted with a dressing tool (rotation axis or the work holding jig), because the dressing of the grinding wheel by the workpiece grinding and similar operations, from the cylinder or the like as in the prior art swing arm and drive The conventional dressing device itself is not required to be handled, and the number of parts of the surface grinding machine can be reduced, the cost can be reduced, and the dressing operation itself can be facilitated. .

It fitted a fitting portion of the dressing tool to a first reference surface of the workpiece holding portion for positioning the follower over click, likewise in a state that the abutment surface is abutted against the dressing tool to the second reference plane, dressing tool Is mounted on the work holding portion and dressing is performed, so that the parallelism of the sharpening wheel with respect to the grinding wheel can be easily and accurately maintained, and the sharpening accuracy can be improved.

The cylindrical member eye freshly tool directly fitted to the center positioning inner peripheral surface of the work holding jig, the dressing tool to the workpiece holding jig in a state where the lower surface of the flange portion of the cylindrical member is brought into contact with the workpiece reference surface Since it is fixed and dressing is performed, the parallelism of the sharpening grindstone with respect to the grinding grindstone can be easily and accurately maintained, and the sharpening accuracy can be improved.

The upper end of the cylindrical portion of the de-less tool, when pressed down by the steel ball of the clamping device, requires space for clamping is small.

It is a side view of a vertical double-sided surface grinder for carrying out the method of the present invention. It is a longitudinal cross-sectional view of the workpiece holding jig and workpiece in the attachment / detachment position. It is a longitudinal cross-sectional view of the workpiece holding jig, the workpiece, and the pressing unit at the grinding position. It is a decomposition | disassembly longitudinal cross-sectional view of the dressing tool used for the method of this invention. It is a bottom view of a cylindrical member. It is a longitudinal cross-sectional view which shows the dressing tool of the state with which the workpiece holding part was mounted | worn. It is a scissors sectional view which shows the dressing tool of the state with which the workpiece | work holding part in 2nd Embodiment was mounted | worn. It is a top view of a prior art example.

[First Embodiment]
[Structure of vertical double-sided surface grinder]
1 to 3 show a vertical double-sided surface grinder capable of performing the dressing method according to the present invention. First, the structure of the vertical double-sided surface grinder will be described. In FIG. 1, which is a side view, a pair of grinding wheels 2 and 3 that are vertically opposed to each other are housed in a main body case 1, and the upper and lower grinding wheels 2 and 3 are arranged on the same vertical axis O3. The upper and lower grindstone shafts 4 and 5 are fixed to each other. Both the grindstone shafts 4 and 5 are configured to be vertically movable by an elevating mechanism, and are linked to a power transmission mechanism so as to rotate in opposite directions.

  The index table 6 for supplying workpieces is fixed to the upper end of a vertical table drive shaft 7, and the table drive shaft 7 is supported by a cylindrical support case 8 through a bearing so as to be rotatable around the table rotation axis O1. The drive motor is interlocked and connected via a transmission mechanism (not shown).

  On the index table 6, a pair of work holding jigs 10 and a clamp device 12 for fixing the work W on each work holding jig 10 from above are provided.

  Both workpiece holding jigs 10 are arranged around the table axis O1 with a phase difference of 180 °, and are supported by a cylindrical jig support case 15 so as to be rotatable around the rotation axis O2. By rotating 6 halfway, the position can be changed between the grinding position A2 on the grinding wheel side and the attaching / detaching position A1 on the opposite side.

  The clamp device 12 includes a pair of cylinders 22 each having a clamp rod 21 that can extend downward, and a pressing unit 23 that is attached to the lower end of each clamp rod 21. Each cylinder 22 is arranged on the same axis as the rotation axis O <b> 2 of the workpiece holding jig 10, and is fixed to a bracket 24 fixed to the upper surface of the index table 6, and holds the workpiece by the rotation of the index table 6. It rotates with the jig 10 around the table rotation axis O1.

  FIG. 2 is an enlarged vertical cross-sectional view of the workpiece holding jig 10 and the workpiece W at the attachment / detachment position A1. The work W is, for example, a vehicle brake disc, and is composed of a hub 26 integrally having a flange portion 26a and an annular disc 27 fixed to the flange portion 26a. To be ground.

  A rotation shaft 30 is rotatably supported in the jig support case 15 via a bearing 29, and the workpiece holding jig 10 is fixed to the upper end surface of the rotation shaft 30 on the same rotation shaft core O2. Although not shown, the lower end of 30 is linked to the drive motor via a gear transmission mechanism. The rotation shaft 30 and the workpiece holding jig 10 constitute a workpiece holding unit 9.

  The workpiece holding jig 10 is formed in an annular shape, and an annular positioning piece 28 is fixed to the coaxial core on the upper surface. On the upper surface of the positioning piece 28, an annular workpiece reference surface 32 is formed so as to protrude upwardly so that the lower surface of the flange portion 26 a of the workpiece W abuts, and the hub 26 of the workpiece W is fitted on the inner peripheral surface 31 of the positioning piece 28. Is set to the dimension you want. Further, the work holding jig 10 is provided with a rotation-preventing pin 37 so as to prevent the rotation of the work W with respect to the work holding jig 10 so as to protrude upward. 10 is inserted into the rod insertion hole 40 formed in the upper part 10 so as to be movable in the vertical direction, and is urged upward by the spring 42, and the upper end part engages with the mounting bolt 45 or the flange part 26a of the work W, thereby holding the work. The work W is prevented from rotating with respect to the jig 10.

  Here, the inner peripheral surface 31 of the positioning piece 28 constitutes a first reference surface for positioning the workpiece W in the horizontal direction when the hub 26 of the workpiece W is fitted, and the workpiece reference surface of the positioning piece 28. 32 constitutes a second reference plane for positioning the workpiece W in the vertical direction.

  FIG. 3 is an enlarged vertical cross-sectional view of the pressing unit 23 and the workpiece holding jig 10 of the clamping device at the grinding position A2, and the pressing unit 23 includes a steel ball 46 that comes into contact with the periphery of the center hole of the workpiece W from above, A ball holding cylinder 47 for fitting and supporting the steel ball 46 in a downward projecting manner, a ball retainer 48 having a conical receiving surface 48 a that abuts on the upper surface of the steel ball 46, and a lower end portion of the clamp rod 21 through a bearing 50. The bearing holder 51 is rotatably supported around the axis O2, and the lower lid 52 is fixed to the lower surface of the bearing holder 51. The steel ball 46, the ball holding cylinder 47, the ball retainer 48, and the bearing holder 51 are These are aligned on the axis of rotation O2 of the workpiece holding jig 10 and on the same axis.

  The inner peripheral surface of the lower half of the sphere holding cylinder 47 is formed in a tapered shape with a small diameter on the lower side, and the steel ball 46 is held in a downward projecting shape by the tapered portion. The ball retainer 48 is fitted into the ball holding cylinder 47 from above and is coupled to the lower lid 52 together with the ball holding cylinder 47 so as to protrude downward.

[Structure of sharpening tool]
FIG. 4 is an exploded longitudinal sectional view of a sharpening tool used in the present invention, and the sharpening tool comprises a disc-shaped sharpening grindstone 60, a cylindrical member 62 integrally having a flange portion 62b, and an annular presser plate 65. Has been. A plurality of bolt insertion holes 66 are formed in the presser plate 65 at intervals in the circumferential direction. The sharpening grindstone 60 has a mounting hole 61 at the center and is formed with a thick outer peripheral portion, and upper and lower end surfaces of the thick outer peripheral portion are formed in parallel with each other. The outer diameter of the setting grindstone 60 is at least larger than the outer diameter of the workpiece. An annular protrusion 62c is integrally formed on the outer periphery of the flange portion 62b of the cylindrical member 62, and a center hole 63 is formed at the center, and a conical pressed surface 63a is formed at the upper end of the center hole 63. Has been. The lower surface 62d of the flange portion 62b is a surface used for maintaining the horizontal posture of the sharpening grindstone 60, and is formed on a surface that is exactly perpendicular to the sharpening tool axis O4. An outer peripheral surface 62a of the cylindrical member 62 is a cylindrical surface used for center positioning, and an outer diameter D1 thereof is set to be the same as the outer diameter of the hub 26 of the workpiece shown in FIG. It is the dimension which fits in.

  FIG. 5 is a bottom view of the cylindrical member 62. A pair of stopper holes 68 are formed in the flange portion 62b, and a plurality of female screw holes 69 are formed at intervals in the circumferential direction.

[Assembly of sharpening tool]
In FIG. 4, a sharpening grindstone 60 is fitted to the outer periphery of the flange portion 62 b of the cylindrical member 62 and brought into contact with the upper surface of the annular protrusion 62 c, and a holding plate 65 is placed on the sharpening grindstone 60 and inserted into the bolt insertion holes 66. By screwing the bolt 71 into the female screw hole 69 of the flange portion 62b, the sharpening grindstone 60, the cylindrical member 62, and the presser plate 65 are integrally coupled.

[Work grinding method]
In FIG. 1, at the attachment / detachment position A <b> 1, the pressing unit 23 is raised, the work W is placed on the work holding jig 10, and the clamp rod 21 is lowered to press the pressing unit 23 against the center of the upper surface of the work W. .

  In FIG. 2, when the workpiece is mounted, the hub 26 of the workpiece W is fitted to the inner peripheral surface 31 of the positioning piece 28, the lower surface of the flange portion 26 a abuts on the annular reference receiving surface 32 of the positioning piece 28, and the locking pin 37. Is positioned at a position displaced from the mounting bolt 45 in the circumferential direction. By lowering the pressing unit 23 in this state, the steel ball 46 comes into pressure contact with the upper end edge P of the inner peripheral surface (center hole) of the hub 26, and the workpiece W is positioned and fixed at a predetermined position as shown in FIG.

  Since the pressurizing portion by the steel ball 46 is housed in the reference receiving surface 32, the workpiece is stably and accurately positioned during clamping.

  After completion of clamping at the attachment / detachment position A1 in FIG. 1, the index table 6 is rotated halfway to be changed to the grinding position A2.

  In FIG. 3, during the position changing operation, the grinding wheels 2 and 3 retreat up and down, and after the position change, the work holding jig 10 is rotated to rotate the work W around the rotation axis O <b> 2. By narrowing the interval between the rotating grinding wheels 2 and 3, the upper and lower end faces are ground simultaneously.

  In addition, since the work W is prevented from rotating with respect to the work holding jig 10 by the rotation pin 37, the work W is not rotated with respect to the work holding jig 10 due to grinding resistance.

  When the grinding of the workpiece W is completed, the upper and lower grinding wheels 2 and 3 retreat vertically from the upper and lower end surfaces of the workpiece W, the rotation of the workpiece holding jig 17 is stopped, and the index table 6 is rotated halfway. The position is changed to the 1 attachment / detachment position A1, and the pressing unit 23 is raised.

[Dressing method]
As shown in FIG. 6, the dressing method is the same as that for the grinding operation by mounting the sharpening tool after assembly on the workpiece holding jig 10 instead of the workpiece, positioning and fixing in the same manner as in the above-described grinding. The upper and lower grinding wheels 2 and 3 are dressed by work.

  That is, in FIG. 6, when the sharpening tool is mounted, the cylindrical member 62 is fitted to the inner peripheral surface 31 of the positioning piece 28, and the flange portion 62b is connected to the upper end reference surface (work reference surface) 32 of the positioning piece 28. The dressing tool is fixed at a predetermined position similar to the workpiece by bringing the lower surface 62d into contact with the steel ball 46 of the pressing unit 23 against the upper end conical surface 63a. Thereby, the perpendicularity of the upper and lower grinding surfaces of the sharpening grindstone 60 with respect to the rotation axis O2 is accurately maintained. Further, the anti-rotation pin 37 engages with the stopper hole 68 of the cylindrical member 62 to prevent the sharpening tool from rotating with respect to the workpiece holding jig 10.

  After the sharpening tool is fixed, the grinding tool is rotated to the grinding position A2 in FIG. By narrowing, the grinding wheels 2 and 3 are dressed.

  From the above description, the following configuration is included in the first embodiment. That is, the workpiece holding jig 10 of the workpiece holding unit 9 has a workpiece reference surface (second reference surface) 32 on the top surface of the positioning piece 28 and an inner peripheral surface (first surface) of the positioning piece 28 for positioning the workpiece W. Reference plane) 31 is provided. The sharpening tool includes a cylindrical member (fitting portion) 62 that fits on the inner peripheral surface 31 of the positioning piece 28, and a lower surface 62 d (contact surface) of the flange portion 62 b that abuts on the workpiece reference surface 32 of the positioning piece 28. Is provided.

  The cylindrical member 62 of the sharpening tool is fitted to the inner peripheral surface of the positioning piece 28 with respect to the workpiece holding jig 10 from which the workpiece W has been removed, and the lower surface 62d of the flange portion 62b is connected to the workpiece reference surface 32 of the positioning piece 28. The abutment tool is mounted while being positioned.

  Further, the dressing tool is fixed using a clamp device 12 for fixing the workpiece W to the workpiece holding jig 10 and dresses the grinding wheel in the same manner as the grinding of the workpiece W.

[Second Embodiment]
FIG. 7 is a longitudinal sectional view showing the dressing tool in a state of being mounted on the work holding unit 9 according to the second embodiment of the present invention. In the first embodiment described above, a setting tool is attached to the work holding jig 10 constituting the work holding unit 9 by replacing the work W. However, in this embodiment, the work holding unit A sharpening tool is attached to the rotating shaft 30 constituting the workpiece 9 by replacing the workpiece holding jig 10. The details will be described below.

  First, between the rotating shaft 30 and the workpiece holding jig 10 of the second embodiment and the first embodiment described above, positioning of the workpiece holding jig 10 with respect to the rotating shaft 30, and thus indirect positioning of the workpiece W. A positioning structure for performing the above is provided.

[Details of positioning structure]
As shown in FIG. 7, the positioning structure has a circular recess 73 formed around the rotation axis O <b> 2 on the upper surface of the rotation shaft 30, and a positioning ring 74 fitted in the recess 73. Yes. The positioning ring 74 is annular and is arranged concentrically with the rotation axis O 2, and is fixed to the rotation shaft 30 with a bolt 79 or the like, and is formed thicker than the depth of the recess 73. The upper portion protrudes upward from the recess 73.

  The rotation shaft upper surface 30 a around the positioning ring 74 is formed on a horizontal flat surface orthogonal to the outer peripheral surface of the positioning ring 74. A plurality of female screw holes 30b are provided on the upper surface of the rotation shaft 30 at equal angular intervals in the circumferential direction around the rotation axis O2.

  As shown in FIG. 3, the positioning structure has a circular recess 75 formed on the lower surface of the work holding jig 10 with the rotation axis O2 as the center. The inner diameter of the recess 75 is formed to a size that can be fitted to the outer peripheral portion of the ring 74, and constitutes a shaft fitting portion that can be fitted to the upper portion of the positioning ring 74. Further, the lower surface 76 of the workpiece holding jig 10 around the recess 75 constitutes a shaft contact surface that contacts the upper surface 30 a of the rotation shaft 30.

  With the positioning structure described above, the workpiece holding jig 10 has a concave portion (shaft fitting portion) 75 fitted to the outer peripheral surface of the positioning ring 74, and the lower surface of the workpiece holding jig 10 on the upper surface 30 a of the rotation shaft 30 ( By abutting the shaft abutting surface 76, the shaft is properly positioned with respect to the rotation shaft 30. Therefore, the workpiece W held by the workpiece holding jig 10 is also indirectly positioned.

  Here, the outer peripheral surface 74a of the positioning ring 74 performs horizontal positioning of the workpiece holding jig 10 with respect to the rotation shaft 30 (direction perpendicular to the rotation axis O2), and thus indirect horizontal positioning of the workpiece W. The upper surface 30a of the rotation shaft 30 similarly forms a second reference surface for positioning in the vertical direction (direction of the rotation axis O2).

  As shown in FIG. 6, bolt insertion holes 77 are formed in the outer peripheral portion of the work holding jig 10 so as to penetrate in the vertical direction at numbers and positions corresponding to the female screw holes 30 b, and are inserted into the bolt insertion holes 77. The workpiece holding jig 10 is fixed to the rotation shaft 30 by screwing the bolt 78 into the female screw hole 30 b of the rotation shaft 30.

[Structure and assembly of sharpening tools]
As shown in FIG. 7, the dressing tool is similar to the first embodiment in that the disk-shaped dressing grindstone 60, a cylindrical member (mounting member) 62 integrally having a flange portion 62b, an annular retainer plate 65, Have However, the configuration of the cylindrical member 62 is different from that of the first embodiment.

  The cylindrical member 62 includes a lower cylindrical portion 62e and an upper flange portion 62b, and the cylindrical portion 62e is configured such that the upper portion of the cylinder is closed by the flange portion 62b. A concave portion 80 formed around the sharpening tool axis O4 is formed at the lower end of the cylindrical inner peripheral surface of the cylindrical portion 62e. The recess 80 is set to have an inner diameter that can be fitted to the outer peripheral surface 74 a of the positioning ring 74, and constitutes a fitting portion that can be fitted to the positioning ring 74.

  Further, the lower surface 62f of the cylindrical portion 62e around the recess 80 constitutes a contact surface that contacts the upper surface (second reference surface) 30a of the rotation shaft. The contact surface 62f is a surface used for maintaining the horizontal posture of the sharpening grindstone 60, and is formed on a surface that is exactly perpendicular to the sharpening tool axis O4.

  The cylindrical member 62 is formed with a bolt insertion hole 81 penetrating vertically from the flange portion 62b to the cylindrical portion 62e. A bolt 78 inserted into the bolt insertion hole 81 is formed in the female screw hole 30b formed in the rotation shaft 30. The cylindrical member 62 is fixed to the rotation shaft 30 by screwing. As the bolt 78, a bolt for fixing the workpiece holding jig 10 to the rotation shaft 30 is used. That is, the sharpening tool is also fixed using the fixing mechanism of the workpiece holding jig 10.

  A convex portion 62g that protrudes in a circular shape is formed on the upper surface of the flange portion 62b. The convex portion 62g is fitted into the center hole of the pressing plate 65, whereby the cylindrical member 62 and the pressing plate 65 are connected to each other. Positioning (center alignment) is performed.

  The assembling of the sharpening tool is the same as that of the first embodiment, and the center mounting hole 61 of the sharpening grindstone 60 is fitted to the outer periphery of the flange portion 62b, and its periphery is brought into contact with the upper surface of the annular protrusion 62c. The presser plate 65 is placed on the sharpening grindstone 60, and a plurality of bolts 71 inserted through the bolt insertion holes 66 are screwed into the female screw holes 69 of the flange portion 62b, whereby the sharpening grindstone 60, the cylindrical member 62 and the presser plate 65 Are coupled together.

  A through hole 82 is formed in the holding plate 65 at a position corresponding to the bolt insertion hole 81. With the through hole 82, the bolt 78 can be inserted into the bolt insertion hole 81 from the holding plate 65 side through the through hole 82 while the sharpening tool is assembled, and can be fastened to the rotation shaft 30.

[Dressing method]
In the case of the second embodiment, the sharpening tool after completion of assembly is positioned and fixed on the rotating shaft 30 instead of the work holding jig 10, and the grinding surfaces of the upper and lower grinding wheels 2 and 3 are the same as the grinding work. Dressing. At this time, the dressing tool is fixed at a predetermined position similar to the workpiece holding jig 10, and the perpendicularity of the upper and lower grinding surfaces of the dressing grindstone 60 with respect to the rotation axis O2 is accurately positioned.

  As described above, the second embodiment includes the following configuration. That is, the rotating shaft 30 of the work holding unit 9 is provided with an outer peripheral surface (first reference surface) 74 a of the positioning ring 74 and the rotating shaft 30 for positioning the work holding jig 10 and thus the work W. An upper surface 30a (second reference surface) is provided. The dressing tool is provided with a recess (fitting portion) 80 that fits on the outer peripheral surface of the positioning ring 74 and a lower surface (contact surface) 62f of the cylindrical member 62 that contacts the upper surface 30a of the rotation shaft 30.

  Then, the concave portion 80 of the cylindrical member 62 of the sharpening tool is fitted to the outer peripheral surface of the positioning ring 74 with respect to the rotation shaft 30 from which the workpiece holding jig 10 is removed, and the lower surface 72f of the cylindrical member 62 is connected to the upper surface of the rotation shaft 30. By abutting on 30a, the dressing tool is mounted in a positioned state.

The sharpening tool is fixed using a bolt 78 for fixing the workpiece holding jig 10 to the rotation shaft 30 and dresses the grinding wheel in the same manner as the workpiece W is ground.
[Other Embodiments]
The present invention is not limited to the above embodiment, and can be appropriately changed in design. For example, instead of the positioning ring 74 described in the second embodiment, a disk-shaped member may be fitted into the recess 73, and the positioning ring 74 is omitted and the center of the upper surface of the rotation shaft 30 is omitted. A convex portion that bulges in a circular shape may be formed, and the outer peripheral surface of the convex portion may be used as the first reference surface.

  The present invention can be effectively used for dressing a pair of upper and lower grinding wheels of a vertical double-sided surface grinder.

Claims (4)

A pair of upper and lower grinding wheels that rotate about a vertical axis, a workpiece holding unit that holds the workpiece in a predetermined position and can rotate about the vertical axis, and a clamping device for fixing the workpiece to the workpiece holding unit; In a vertical double-sided surface grinding machine that simultaneously grinds both the upper and lower end faces by inserting the work held by the work holding part between both grinding wheels,
It is equipped with a sharpening tool that is attached to the work holder in exchange for the work.
The work holding part has first and second reference surfaces for positioning the work so that the work holding part can be fitted to a work having an annular disk and a hub part. It consists of a circumferential surface concentric with the rotation axis of the holding part, and the second reference surface consists of a surface perpendicular to the rotation axis,
The dressing tool includes a cylindrical member integrally having a flange portion, a disc-shaped dressing grindstone, and an annular presser plate, and the lower portion of the cylindrical member is fitted to the work holding portion so that the dressing tool is fitted to the work holding portion. The outer peripheral surface is a cylindrical surface concentric with the tool axis of the sharpening tool and is fitted to the first reference surface, and the lower surface of the flange portion is a surface perpendicular to the tool axis and is second. It is in contact with the reference surface,
The sharpening wheel has a mounting hole in the center and the outer peripheral part is formed thick, and the annular protrusion is integrally formed on the outer periphery of the flange part,
The mounting hole of the sharpening wheel is fitted to the outer periphery of the flange, and the annular protrusion and the presser plate are brought into contact with the thin inner peripheral part of the sharpening wheel, and the bolt is inserted into the screw hole formed in the flange and the presser plate. By doing so, the sharpening grindstone, the cylindrical member and the presser plate are integrally coupled,
The upper and lower end surfaces of the thickened outer peripheral part of the sharpening wheel are grinding surfaces formed in parallel with each other, and these upper and lower end surfaces are vertically moved when the sharpening tool held by the work holding part is inserted between the two grinding wheels. It is a grinding surface for dressing a grinding wheel of
A vertical double-sided surface grinding machine. The work holding part is composed of a rotation shaft that can rotate around a vertical axis, and a work holding jig fixed on the rotation axis.
The workpiece holding jig has a first reference surface and a second reference surface;
The vertical double-sided surface grinding machine according to claim 1. A pair of upper and lower grinding wheels that rotate around the vertical axis, a rotation axis that holds the workpiece in place and can rotate about the vertical axis, and a workpiece holding jig that is fixed on the rotation axis of the rotation axis And a clamp device for fixing the workpiece to the workpiece holding jig, and a vertical double-ended flat surface that simultaneously grinds both the upper and lower end surfaces by inserting the workpiece held by the workpiece holding portion between the two grindstones. In the grinding machine
It is equipped with a sharpening tool that is attached to the rotating shaft by replacing the workpiece and workpiece holding jig.
The rotation shaft has first and second reference surfaces for positioning the workpiece holding jig so that the rotation shaft can be fitted to the workpiece holding jig, and the first reference surface is concentric with the rotation axis. A circumferential surface, and the second reference surface is a surface perpendicular to the rotation axis,
The dressing tool includes a cylindrical member integrally having a flange portion, a disc-shaped dressing grindstone, and an annular presser plate, and a lower part of the cylindrical member is fitted so that the dressing tool is fitted to the rotation shaft. The inner peripheral surface is a cylindrical surface concentric with the tool axis of the sharpening tool and is fitted to the first reference surface, and the lower surface of the cylindrical member is a surface perpendicular to the tool axis and is second. It is in contact with the reference surface,
The sharpening wheel has a mounting hole in the center and the outer peripheral part is formed thick, and the annular protrusion is integrally formed on the outer periphery of the flange part,
The mounting hole of the sharpening wheel is fitted to the outer periphery of the flange, and the annular protrusion and the presser plate are brought into contact with the thin inner peripheral part of the sharpening wheel, and the bolt is inserted into the screw hole formed in the flange and the presser plate. By doing so, the sharpening grindstone, the cylindrical member and the presser plate are integrally coupled,
The upper and lower end surfaces of the thickened outer peripheral part of the sharpening wheel are grinding surfaces formed in parallel with each other, and these upper and lower end surfaces are vertically moved when the sharpening tool held by the work holding part is inserted between the two grinding wheels. It is a grinding surface for dressing a grinding wheel of
A vertical double-sided surface grinding machine. The clamp device has a steel ball for pressing the upper end of the cylindrical member of the sharpening tool.
A saddle type double-headed surface grinder according to any one of claims 1 to 3.

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