JP5701405B2 - Grinding wheel mounting device - Google Patents

Description

  The present invention relates to a grinding wheel mounting device, and more particularly to a grinding wheel mounting device capable of easily mounting a grinding wheel to a grinding wheel flange while ensuring centering accuracy.

  Patent Document 1 discloses that a grinding wheel is trued by a grinding wheel correcting device outside the grinding machine, and the grinding wheel is attached to the grinding machine according to the same attachment standard.

  The thing of patent document 1 is a grindstone between the attachment surface (outer peripheral surface) of each grindstone shaft of a grindstone correction apparatus and a grinding machine, and the attachment hole (inner peripheral surface) of the grinding wheel attached to this attachment surface. By providing a clearance that allows the wheel to be easily fitted to the grindstone shaft, the grindstone wheel can be easily attached to and detached from the grindstone shaft.

  In addition, a boss portion for mounting a disc-shaped grindstone holder having a grindstone layer is provided on a grindstone sleeve that can be taper-fitted to the grindstone shaft, and the boss portion has the same diameter as that of the grindstone holder and is 180 degrees Patent Document 2 describes the following arc-shaped grindstone mounting portion.

  The thing of patent document 2 can hold | maintain a grindstone holder to a grindstone sleeve concentric state while being able to mount | wear a grindstone mounting part of a grindstone sleeve easily.

JP 7-40237 A JP 61-182767 A

  However, as shown in FIG. 8 of Patent Document 1, as described in Patent Document 1, the inner diameter of the mounting hole 2a of the grinding wheel 2 is made larger than the outer diameter of the mounting surface 1a of the grinding wheel shaft 1, Since the clearance CL is provided, when the grinding wheel is trued by the grinding wheel correcting device, the center O2 of the grinding wheel 2 is eccentrically attached to the center O1 of the grinding wheel shaft 1 by an eccentric amount ε. For this reason, the grinding wheel layer 3 of the grinding wheel 2 is decentered with respect to the outer peripheral surface of the grinding wheel core 4 and is trued. Therefore, in order to true the grinding wheel layer 3 in a perfect circle with respect to the grinding wheel shaft 1, the truing amount Q1 in a part of the circumference of the grinding wheel layer 3 must be locally increased. There is a problem of shortening the service life.

  Moreover, as shown in FIG. 1 of Patent Document 2, the one described in Patent Document 2 is configured such that a grindstone holder (2) is a grindstone sleeve (5) and a tightening flange (10) by tightening bolts (11). In this state, the grindstone sleeve (5) is taper-fitted to the grindstone shaft (12) and is fastened and fixed by the tightening nut (13). It is mounted concentrically with the grinding wheel shaft 12). Therefore, each time the grinding wheel is replaced, it is necessary to remove and attach a heavy grinding wheel sleeve or the like from the grinding wheel shaft, and there is a problem that the workability of the grinding wheel replacement is poor and the time required for the grinding wheel replacement becomes long.

  Moreover, in the case of the one described in Patent Document 2, when the protruding amount of the arc-shaped grindstone mounting portion (6a) formed on the boss portion (6) of the grindstone sleeve (5) is small, the grindstone holder (2) is mounted. The gap becomes smaller, and it becomes difficult to mount the grindstone holder (2) on the grindstone mounting portion (6a) of the grindstone sleeve (5). Therefore, in order to facilitate the mounting of the grindstone holder (2), it is necessary to increase the protrusion amount of the grindstone mounting portion (6a), and there is a problem that the rotational unbalance of the grindstone sleeve (5) increases. .

  The present invention was made to solve the above-described conventional problems, and reduces the weight of the grinding wheel to be replaced, so that the grinding wheel can be easily mounted on the grinding wheel flange and the centering accuracy is ensured. It is an object of the present invention to provide a grinding wheel mounting device that can be mounted.

In order to solve the above-mentioned problems, a feature of the invention according to claim 1 is an attachment device for attaching a grinding wheel having a grinding wheel layer on the outer periphery to a grinding wheel flange detachably fixed to the outer periphery of the grinding wheel shaft. The grindstone flange is provided with a grindstone mounting shaft portion for mounting the grinding wheel, a fitting introduction portion is formed on the outer periphery of the grindstone mounting shaft portion, and an arcuate shape is formed at the base end portion of the fitting introduction portion. A fitting convex portion is formed over an angle range of less than 180 degrees, and the fitting introducing portion is configured so that the grinding wheel can be smoothly guided in the vertical and horizontal directions and can smoothly run on the fitting convex portion. in the set to a smaller diameter than the diameter of the fitting convex portion, the grinding wheel to form a center hole having a diameter which diameter concentrically with the matching fitting before Kihama convex portions, On the shaft end side of the grindstone mounting shaft portion of the fitting introduction portion, a radial dimension from the fitting introduction portion. A small relief part is formed over a predetermined angle range at a position spaced apart from the fitting convex part in the axial direction and facing the fitting convex part in the circumferential direction, and the fitting of the grindstone mounting shaft part The grinding wheel is fixed to the end face of the grinding wheel flange in a state in which the center hole of the grinding wheel is concentrically matched with the convex portion.
A feature of the invention according to claim 2 is that, in claim 1, the diameter dimension of the fitting introduction part is made 0.015 to 0.35 mm smaller than the diameter dimension of the fitting convex part.

A feature of the invention according to claim 3 is that, in claim 1 or claim 2 , the fitting introduction part and the relief part have a cylindrical shape concentric with the fitting convex part.

According to a fourth aspect of the present invention, in any one of the first to third aspects, an up mark is provided on the grindstone flange at an angular position corresponding to the fitting convex portion.

The invention according to claim 5 is characterized in that, in claim 4 , the grinding wheel to be mounted on the grinding wheel flange is preliminarily molded on the outer periphery of the grinding wheel layer with reference to the center hole outside the machine. Is provided with an alignment mark corresponding to the up mark.

A feature of the invention according to claim 6 is an attachment device for attaching a grinding wheel provided with a grinding wheel layer on the outer periphery with respect to the grinding wheel flange detachably fixed to the outer periphery of the grinding wheel shaft. A grinding wheel mounting shaft portion for mounting the grinding wheel is provided, a fitting introduction portion is formed on an outer periphery of the grinding wheel mounting shaft portion, and a central hole having a diameter larger than the diameter size of the fitting introduction portion is formed in the grinding wheel. An arcuate fitting convex portion having a diameter dimension that is concentrically matched with the diameter dimension of the grinding wheel fitting portion is formed at 180 degrees on the inner periphery of the center hole of the grinding wheel. Formed over an angle range of less than, and the fitting introduction portion is configured so that the grinding wheel can be smoothly guided in the vertical and horizontal directions and can smoothly run on the grinding wheel fitting portion. It is set from the diameter to a small diameter, the abrasive of the fitting inlet portion On the shaft end side of the mounting shaft portion, a relief portion having a smaller radial dimension than the fitting introduction portion is spaced apart from the grinding wheel fitting portion in the axial direction, and the fitting convex portion of the grinding wheel and the circumferential direction The grinding wheel is formed over a predetermined angle range at a position opposite to the grinding wheel, and the fitting convex portion of the grinding wheel is concentrically matched and fitted to the grinding wheel fitting portion of the grinding wheel mounting shaft portion. Is fixed to the end face of the grindstone flange.
A feature of the invention according to claim 7 is that, in claim 6, the diameter dimension of the fitting introduction part is made 0.015 to 0.35 mm smaller than the diameter dimension of the fitting convex part.
The feature of the invention according to claim 8 is a mounting method for attaching a grinding wheel having a grinding wheel layer on the outer periphery to a grinding wheel flange detachably fixed to the outer periphery of the grinding wheel shaft, A grindstone mounting shaft portion for mounting the grinding wheel is provided, a fitting introduction portion is formed on the outer periphery of the grinding wheel mounting shaft portion, and an arcuate fitting convex portion is less than 180 degrees at the base end portion of the fitting introduction portion. The fitting introduction part is formed so that the grinding wheel can be smoothly guided in the vertical and horizontal directions and can smoothly run on the fitting convex part. is set to a smaller diameter than the diameter, the the grinding wheel to form a center hole having a diameter which diameter concentrically with the matching fitting before Kihama convex portion, the grinding wheel of the fitting inlet portion On the shaft end side of the mounting shaft portion, a relief portion having a smaller radial dimension than the fitting introduction portion is provided. Formed over a predetermined angle range at a position spaced apart from the convex portion in the axial direction and facing the fitting convex portion in the circumferential direction, and the grinding wheel is mounted on the fitting introduction portion of the grindstone mounting shaft portion. The center hole is supported, and in this state, the grinding wheel is moved in the axial direction of the grinding wheel mounting shaft portion while being guided by the fitting introduction portion, and the central hole of the grinding wheel is moved to the grinding wheel mounting shaft portion. In this state, the grinding wheel is fixed to the end face of the grinding wheel flange.
The feature of the invention according to claim 9 is that, in claim 8, the diameter of the fitting introduction part is made 0.015 to 0.35 mm smaller than the diameter of the fitting convex part.

  According to the invention according to claim 1 configured as described above, when the grinding wheel is attached to the grinding wheel mounting shaft portion of the grinding wheel flange by forming the fitting introduction portion, the grinding wheel has a gap in the grinding wheel mounting shaft portion. After the grinding wheel is mounted on the grinding wheel mounting shaft portion, the grinding wheel is slid on the fitting introduction portion and the inner peripheral surface of the grinding wheel is fitted to the fitting convex portion. be able to.

  This makes it easy to mount the grinding wheel on the grinding wheel flange, so that the gap between the grinding wheel mounting shaft and the grinding wheel can be made as small as possible. The coolant can be prevented from entering the gap, and the rotation unbalance of the grindstone flange can be reduced, and the balancing operation is facilitated.

  In addition, the relief part on the shaft end side of the grindstone mounting shaft part is formed over a predetermined angle range away from the fitting convex part in the axial direction, so it fits between the relief part and the fitting convex part. The introduction part can be formed over the entire circumference, so that even when the grinding wheel is tilted up and down and left and right when guiding the grinding wheel on the fitting introduction part, the inclination is regulated by the fitting introduction part. Even if the gap between the grinding wheel mounting shaft portion and the grinding wheel is small, the grinding wheel can be smoothly fitted to the fitting convex portion.

In addition, according to the first aspect of the present invention, the center of the grinding wheel can be made to coincide with the center of the grinding wheel flange by the mating fitting between the center hole of the grinding wheel and the fitting convex portion. The concentric accuracy can be ensured. In addition, since only the disc-shaped grinding wheel is attached to the grinding wheel mounting shaft portion of the grinding wheel flange, the replacement weight when the grinding wheel is replaced can be reduced, and the workability of the grinding wheel replacement can be improved. it can.

According to the third aspect of the present invention, since the fitting introduction part and the relief part have a cylindrical shape concentric with the fitting convex part, the fitting introduction part and the relief part can be easily formed.

According to the invention of claim 4 , since the up mark is provided at the angular position corresponding to the fitting convex portion on the grinding wheel flange, the fitting convex portion of the grinding wheel flange can be easily set to the upward angular position when the grinding wheel is mounted. Can be positioned.

According to the fifth aspect of the present invention, the grinding wheel mounted on the grinding wheel flange is preliminarily molded with the outer circumference of the grinding wheel layer on the basis of the inner circumference outside the machine, and the grinding wheel has an alignment mark corresponding to the up mark. By attaching the grinding wheel alignment mark to the grinding wheel flange so that it matches the up mark of the grinding wheel flange, the grinding wheel can be easily attached to the grinding wheel flange of the grinding machine with the same mounting standard as when molding. Can do.

According to the invention which concerns on Claim 6 , a grindstone fitting which provides a fitting convex part and a relief arc part on the inner peripheral side of the grinding wheel, and fits the fitting arc part on the grindstone mounting shaft part side of the grindstone flange. Since the portion, the introduction fitting portion, and the escape portion are provided, the same effects as described in the first aspect can be achieved.
According to the invention according to claim 8 , the center hole of the grinding wheel is supported by the fitting introduction portion of the grinding wheel mounting shaft portion, and the grinding wheel mounting shaft portion is guided in the axial direction in this state while the grinding wheel is guided by the fitting introduction portion. Since the center hole of the grinding wheel is concentrically matched with the fitting convex part of the grinding wheel mounting shaft, and the grinding wheel is fixed to the end face of the grinding wheel flange in this state. The same effects as described in claim 1 can be obtained.

It is a top view of the grinding machine suitable for implementation of this invention. FIG. 1 is an enlarged front view of a grindstone mounting device as viewed from the direction of arrow 2 in FIG. 1, showing a first embodiment of the present invention. It is sectional drawing of the grindstone mounting apparatus cut | disconnected along the 3-3 line of FIG. It is a perspective view which shows the grindstone mounting shaft part of a grindstone flange. It is a top view which shows an example of the shaping | molding apparatus which shape | molds a grinding wheel. It is sectional drawing of the grindstone attachment apparatus which shows the 2nd Embodiment of this invention. It is sectional drawing cut | disconnected along the 7-7 line | wire of FIG. It is a figure which shows the relationship between the grindstone axis | shaft and grinding wheel in a prior art.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a grinding machine 10 suitable for the present embodiment. A table 12 is supported on a bed 11 of the grinding machine 10 so as to be movable in the Z-axis direction. 13 is moved through an unillustrated feed screw mechanism. A headstock 14 and a tailstock 15 are installed on the table 12 so as to face each other, and the workpiece W is supported by the spindle stock 14 and the tailstock 15 so as to be rotatable around an axis parallel to the Z-axis direction. Is done.

  On the bed 11, a grindstone base 17 is supported so as to be movable in the X-axis direction intersecting the Z-axis, and is moved through a feed screw mechanism (not shown) by driving a servo motor 18 installed on the bed 11. It has come to be. A grinding wheel shaft 20 for holding the grinding wheel 19 is supported on the grinding wheel platform 17 so as to be rotatable about a horizontal axis perpendicular to the moving direction of the grinding wheel platform 17. The grinding wheel shaft 20 is mounted on the grinding wheel platform 17. It is rotationally driven by the drive motor 21.

  Servo motors 13 and 18 for driving the table 12 and the grindstone table 17 are NC-controlled by an NC device 29. The table 12 moves in the Z-axis direction and the grindstone table 17 moves in the X-axis direction. Thus, the workpiece W is ground by the grinding wheel 19.

  2 and 3 show a first embodiment of the present invention. A grinding wheel 19 includes a disc-shaped grinding wheel core 25 having a grinding wheel layer 24 provided on an outer peripheral surface 25b. A central hole having an inner peripheral surface 25a made of a perfect circle is formed at the center, and the outer peripheral surface 25b and the inner peripheral surface 25a of the grindstone core 25 are processed concentrically. The grinding wheel 19 is detachably attached to a grinding wheel flange 23 that is taper-fitted on the grinding wheel shaft 20 and is detachably fixed by a tightening nut 26, as will be described later. The grindstone flange 23 fixed to the grindstone shaft 20 is balanced by an unillustrated balancing device.

  The grindstone flange 23 is formed with a grindstone mounting shaft portion 23a concentrically with the center of the grindstone flange 23 (the grindstone shaft 20), and the inner peripheral surface 25a of the grindstone core 25 is fitted to the grindstone mounting shaft portion 23a. It has become. The grinding wheel 19 fitted to the grinding wheel mounting shaft portion 23 a of the grinding wheel flange 23 is fixed to the end surface of the grinding wheel flange 23 by a plurality of bolts 27 that are inserted through a plurality of bolt holes formed on the circumference of the grinding stone core 25. The In addition, the grindstone layer 24 consists of what combined the CBN abrasive grain by vitrified bond, for example.

  As shown in FIG. 3, the grindstone mounting shaft portion 23 a of the grindstone flange 23 has an axial length sufficiently larger than the axial width of the grindstone core 25 of the grinding wheel 19. As shown in FIG. 4, a fitting introduction portion 23 a 1 for forming a circumferential gap when the grinding wheel 19 is mounted is formed on the outer periphery of the grindstone mounting shaft portion 23 a. The fitting introduction portion 23a1 is formed in a cylindrical shape concentric with the rotation center O1 of the grindstone mounting shaft portion 23a (grindstone flange 23), and an outer diameter D1 thereof is an inner diameter (described later) of the inner circumferential surface 25a of the grindstone core 25. The outer diameter of the fitting convex portion 23a2) is set to a dimension slightly smaller than D0, for example, a small diameter of about 0.05 mm (D0> D1).

  On the proximal end of the fitting introduction portion 23a1 of the grindstone mounting shaft portion 23a, that is, on the end face side of the grindstone flange 23, the fitting convex portion 23a2 having substantially the same diameter as the inner diameter (D0) of the inner peripheral surface 25a of the grindstone core 25. However, it is formed concentrically with the fitting introduction portion 23a1 over an angle range θ of less than 180 degrees, for example, an angle range of 90 degrees. By forming the fitting convex portion 23a2 in the angle range of 90 degrees, a gap can be formed not only in the vertical direction but also in the horizontal direction between the grinding wheel 19 and the grinding wheel mounting shaft portion 23a.

  As a result, the base end portion of the fitting introduction portion 23a1 of the grindstone mounting shaft portion 23a of the grindstone flange 23 has a smaller diameter portion (fitting introduction portion 23a1) than the fitting convex portion 23a2, except for the fitting convex portion 23a2. Is formed over an angular range exceeding 180 degrees.

  When the grinding wheel 19 is attached to the grinding wheel mounting shaft portion 23a of the grinding wheel flange 23 by forming the fitting introduction portion 23a1, the inner peripheral surface 25a of the grinding wheel 19 is attached to the center O1 of the grinding wheel mounting shaft portion 23a. The grinding wheel 19 can be inserted in a state where there is a gap around the entire circumference of the shaft portion 23a, and the attaching operation of the grinding wheel 19 to the grinding wheel mounting shaft portion 23a can be easily performed.

  Moreover, after the grinding wheel 19 is inserted into the fitting introduction portion 23a1 of the grinding wheel mounting shaft portion 23a, when the grinding wheel 19 is released, the inner peripheral surface 25a of the grinding wheel 19 is fitted and introduced into the grinding wheel mounting shaft portion 23a by gravity. Supported by the portion 23a1, the grinding wheel 19 is positioned and supported perpendicular to the mounting axis direction. Therefore, in this state, the inner peripheral surface 25a of the grinding wheel 19 can be easily moved to the fitting convex portion 23a2 by moving the grinding wheel 19 toward the end face of the grinding wheel flange 23 while sliding on the fitting introduction portion 23a1. Can be fitted.

  That is, the step size of the fitting convex portion 23a2 and the fitting introduction portion 23a1 is small and varies depending on the diameter of the grinding wheel 19, but is, for example, 0.015 to 0.35 mm (preferably 0.025 mm). By sliding the grinding wheel 19 on the fitting introduction portion 23a1, the grinding wheel 19 can be easily fitted to the fitting convex portion 23a2 of the grinding wheel mounting shaft portion 23a. In this case, chamfering may be formed at the end portion of the inner peripheral surface 25a of the grinding wheel 19. In this state (a state where the inner peripheral surface 25a of the grinding wheel 19 is fitted to the fitting convex portion 23a2 of the grinding wheel flange 23), between the inner peripheral surface 25a of the grinding wheel 19 and the grinding wheel mounting shaft portion 23a, A clearance CL is formed over a half circumference or more, and the center of the grinding wheel 19 is made coincident with the center O1 of the grinding wheel mounting shaft portion 23a, and eventually the center of the grinding wheel shaft 20, so that centering accuracy is ensured.

  Thus, the grinding wheel 19 can be fitted and held on the fitting convex portion 23a2 of the grinding wheel mounting shaft portion 23a with the fitting introduction portion 23a1 as a guide, so that the clearance between the grinding wheel mounting shaft portion 23a and the grinding wheel 19 Even if CL is reduced, the grinding wheel 19 can be easily attached to the grinding wheel flange 23.

  Therefore, the gap CL between the grinding wheel mounting shaft portion 23a and the grinding wheel 19 can be made as small as possible. In other words, since the protruding amount of the fitting convex portion 23a2 can be reduced, the rotation unbalance of the grindstone flange 23 can be reduced, and the balancing operation of the grindstone flange 23 is facilitated. In addition, since the gap CL can be reduced, foreign matters such as grinding scraps and coolant can be made difficult to enter the gap CL, and the occurrence of rust can be suppressed.

  Moreover, since it is only necessary to attach and detach the disc-shaped grinding wheel 19 to the grinding wheel mounting shaft portion 23a of the grinding wheel flange 23 fixed to the grinding wheel shaft 20, the weight of the replacement grinding wheel when the grinding wheel 19 is replaced is reduced. It is possible to easily and quickly carry out the grinding wheel replacement work.

  A relief portion 23a3 having a smaller diameter than the fitting introduction portion 23a1 is provided at the end of the fitting introduction portion 23a1 (the shaft end of the grinding stone attachment shaft portion 23a) of the grindstone mounting shaft portion 23a of the grindstone flange 23 from the fitting convex portion 23a2. It is formed in a circumferential position that is spaced apart by a predetermined amount in the axial direction and that is 180 degrees different from the fitting convex portion 23a2 over an angular range that exceeds 180 degrees, for example, about 270 degrees. The relief portion 23a3 is formed in an arc shape concentric with the fitting introduction portion 23a1, and its outer diameter D2 is set to a small diameter of, for example, about 0, 1 mm with respect to the outer diameter D1 of the fitting introduction portion 23a1. (D1> D2).

  Thereby, when the grindstone flange 23 is positioned at an angle with the fitting convex portion 23a2 facing upward, the radial dimension S1 (see FIG. 2) of the shaft end of the grindstone mounting shaft portion 23a is set to the fitting introduction portion 23a1. It can be made smaller than the outer diameter D1. Accordingly, when the grinding wheel 19 is mounted on the grinding wheel mounting shaft portion 23a of the grinding wheel flange 23, the substantial diameter of the inner peripheral surface 25a of the grinding wheel 19 is assumed if the grinding wheel 19 is inclined in the front-rear direction or the left-right direction. Even if becomes smaller, it is possible to easily insert the grindstone core 25 into the grindstone mounting shaft portion 23a of the grindstone flange 23 by forming the relief portion 23a3.

  Moreover, the relief portion 23a3 is formed with a predetermined distance from the fitting convex portion 23a2 in the axial direction, and the fitting introduction portion 23a1 is formed over the entire circumference between the fitting convex portion 23a2 and the relief portion 23a3. Therefore, even when the grinding wheel 19 is slid on the fitting introduction portion 23a1, the inclination can be regulated by the fitting introduction portion 23a1, and even if it is a small gap, the grinding wheel 19 can be regulated. Can be smoothly fitted to the fitting convex portion 23a2.

  As described above, since the step between the fitting convex portion 23a2 and the fitting introducing portion 23a1 is small, the grinding wheel 19 is smoothly guided in the vertical and horizontal directions, so that the stepped portion (fitting convex portion 23a2) is smoothly provided. You can get on. In addition, when the clearance CL between the inner peripheral surface 25a of the grinding wheel 19 and the grinding wheel mounting shaft portion 23a is small, it becomes difficult to put the grinding wheel 19 into the grinding wheel mounting shaft portion 23a, but the entrance portion of the grinding wheel mounting shaft portion 23a ( Since the relief portion 23a3 is formed at the shaft end portion, the grinding wheel 19 can be easily mounted on the grinding wheel mounting shaft portion 23a even if the clearance CL is small.

  The fitting introduction portion 23a1, the fitting projection 23a2, and the relief portion 23a3 are formed concentrically with the rotation center of the grindstone flange 23, so that the fitting introduction portion 23a1 and the fitting projection are formed by a cylindrical grinder. The 23a2 and the escape portion 23a3 can be processed relatively easily.

  Specifically, first, the outer periphery of the grindstone mounting shaft portion 23a is processed into a diameter D0, and then the fitting introduction portion 23a1 having a diameter D1 is provided so that the fitting convex portion 23a2 protrudes over a predetermined angular range. And finally, the relief part 23a3 having a diameter D2 is processed over a predetermined angular range.

  As shown in FIG. 2, an alignment mark M <b> 1 is attached to the side surface of the grinding wheel core 25 of the grinding wheel 19 as an attachment index indicating the directionality when the grinding wheel 19 is attached to the grinding wheel attachment shaft portion 23 a of the grinding wheel flange 23. ing. Thereby, the grinding wheel 19 can be easily mounted at an angle at which the alignment mark M1 coincides with the fitting convex portion 23a2 formed on the grinding wheel mounting shaft portion 23a of the grinding wheel flange 23.

  On the other hand, on the side surface of the grindstone mounting shaft portion 23a of the grindstone flange 23, as shown in FIGS. 2 and 3, an up mark M2 indicating the directionality for attaching the grinding wheel 19 is an angular position corresponding to the fitting convex portion 23a2. Has been granted. The grindstone flange 23 is normally positioned at an angular position where the up mark M2 (fitting convex portion 23a2) is located above the vertical direction. In this state, the inner peripheral surface 25a of the grinding wheel 19 is placed on the grindstone mounting shaft portion 23a. Installed.

  In this case, when the grinding wheel 19 is molded (truing) by a molding device 30 or the like which will be described later, the grinding wheel 19 is attached to the grinding wheel mounting shaft portion 23a of the grinding wheel flange 23 to the grinding wheel 19 as shown in FIG. An alignment mark M1 indicating the direction of the operation is formed, and the grinding wheel 19 is attached to the grindstone mounting shaft portion 23a of the grindstone flange 23 so that the alignment mark M1 coincides with the up mark M2 formed on the grindstone flange 23. Just do it. As a result, the grinding wheel 19 can be attached to the grinding wheel flange 23 with the same attachment standard as when the grinding wheel is formed, and the concentric accuracy of the grinding wheel 19 attached to the grinding wheel flange 23 can be ensured.

  Next, prior to attaching the grinding wheel 19 to the grinding wheel flange 23 of the grinding machine 10, a forming (truing) process for completing the grinding wheel 19 as a product will be described.

  FIG. 5 shows an example of a molding apparatus 30 for molding the grinding wheel 19. A table 32 is supported on the bed 31 of the molding apparatus 30 so as to be movable in the Z-axis direction, and is a servo installed on the bed 31. The motor 33 is driven to move through a feed screw mechanism (not shown). A molding table 34 is fixed on the table 32, and a diamond roll 35 for truing the grinding wheel 19 is supported on the molding table 34 so as to be rotatable about an axis parallel to the Z-axis direction. The diamond roll 35 is rotationally driven by a motor (not shown) installed on the forming table 34.

  A grindstone support base 37 is supported on the bed 31 so as to be movable in the X-axis direction intersecting the Z-axis, and driven by a servo motor 38 installed on the bed 31 via a feed screw mechanism (not shown). It has been moved. A grindstone flange (not shown) having a grindstone mounting shaft for mounting the grinding wheel 19 is supported on the grindstone support base 37 so as to be rotatable around a horizontal axis perpendicular to the moving direction of the grindstone support base 37. Is rotated by a grindstone drive motor 40 installed on the grindstone support 37.

  The grindstone mounting shaft portion of the grindstone flange has the same configuration as the grindstone mounting shaft portion 23a of the grindstone flange 23 mounted on the grindstone shaft 20 of the grinding machine 10, and a portion of the outer periphery extends over a half or more of the grindstone. An escape portion having a diameter smaller than the outer diameter of the mounting shaft portion 23a by a predetermined dimension is formed, and an arcuate fitting that fits concentrically with the inner peripheral surface 25a of the grindstone core 25 within a half circumference excluding the escape portion. Protrusions are formed.

  Servo motors 33 and 38 for driving the table 32 and the grindstone support base 37 are controlled by the NC device 43, and the diamond roll 35 is moved by moving the table 32 in the Z-axis direction and moving the grindstone support base 37 in the X-axis direction. Thus, the outer periphery of the grinding wheel 19 is formed into a perfect circle (truing) with reference to the inner peripheral surface 25a of the grinding wheel 19, and balancing is performed as necessary.

  In this manner, the grinding wheel 19 is completed as a product, and the grinding wheel 19 is mounted on the side surface of the grinding wheel core 25 of the grinding wheel 19 on the side of the grinding wheel 10 with the same mounting standard as that for grinding wheel truing. The alignment mark M1 (see FIG. 2) is formed at a position corresponding to the fitting convex portion of the grindstone flange of the molding device 30.

  In this case, the alignment mark M1 is formed before the grinding wheel 19 is attached to the molding apparatus 30, and the alignment mark M1 is attached to the grinding wheel flange so as to correspond to the fitting convex portion of the grinding wheel flange. Good.

  Next, the operation in the first embodiment will be described. When the grinding wheel 19 used in the grinding machine 10 reaches the end of its life, the bolts 27 are loosened, the grinding wheel 19 is removed from the grinding wheel flange 23, and replaced with a grinding wheel 19 that has been completed as a product in advance.

  At the time of exchanging the grindstone, the grindstone flange 23 is positioned so that the up mark M2 (fitting convex portion 23a2) faces upward, and the grind wheel 19 is aligned with the alignment mark M1 of the grind wheel 19 on the up mark M2. Is mounted on the grindstone mounting shaft portion 23 a of the grindstone flange 23.

  At this time, the grindstone mounting shaft portion 23a of the grindstone flange 23 is formed with a fitting introduction portion 23a1 having a smaller diameter than the inner peripheral surface 25a of the grinding wheel 19 over the entire circumference. The grinding wheel 19 can be inserted with a gap around the entire circumference.

  Moreover, since a relief portion 23a3 having a smaller diameter than the fitting introduction portion 23a1 is formed at the shaft end of the grindstone mounting shaft portion 23a, the grindstone is mounted when the grindstone 19 is mounted on the grindstone mounting shaft portion 23a of the grindstone flange 23. Even if the wheel 19 is slightly inclined, the grindstone core 25 can be easily inserted into the grindstone mounting shaft portion 23 a of the grindstone flange 23.

  In this way, after the grinding wheel 19 is inserted into the fitting introduction portion 23a1 of the grinding wheel mounting shaft portion 23a, when the grinding wheel 19 is released, the inner peripheral surface 25a of the grinding wheel 19 is moved by the gravity action of the grinding wheel mounting shaft portion 23a. It can be supported by the fitting introduction part 23a1. Therefore, the operator simply slides the grinding wheel 19 on the fitting introduction portion 23a1 toward the end face of the grinding wheel flange 23 in a state where the grinding wheel 19 is supported by the fitting introduction portion 23a1 of the grinding wheel mounting shaft portion 23a. The inner peripheral surface 25a of the grinding wheel 19 can be fitted into the fitting convex portion 23a2.

  At this time, since the relief portion 23a3 is formed at a predetermined distance from the fitting convex portion 23a2 in the axial direction, the grinding wheel 19 is slightly inclined when the grinding wheel 19 is slid by the fitting introduction portion 23a1. However, the grinding wheel 19 can be smoothly fitted to the fitting convex portion 23a2 by the guidance of the fitting introduction portion 23a1.

  The grinding wheel 19 fitted to the fitting convex portion 23 a 2 of the grinding wheel mounting shaft portion 23 a is positioned and held concentrically with respect to the grinding wheel flange 23. In this state, as shown in FIGS. 2 and 3, the grindstone core 25 is fastened to the end face of the grindstone flange 23 by a plurality of bolts 27 inserted through the plurality of bolt holes formed on the circumference of the grindstone core 25. The wheel 19 is fixed to the grindstone flange 23.

  According to the first embodiment described above, the grinding wheel 19 is attached to the grinding wheel mounting shaft portion 23a on the same mounting reference as that during molding (truing), and the grinding wheel 19 attached to the grinding machine 10 is used. Is held concentrically with the grindstone mounting shaft portion 23a and by extension, the grindstone shaft 20, and a perfect circle accuracy is ensured. Therefore, even if the grinding wheel 19 is not trued after the grinding wheel 19 is attached to the grinding machine 10, vibration or the like is not generated when the grinding wheel 19 rotates at high speed, and high-precision grinding can be performed.

  In addition, since the grinding wheel 19 can be inserted with the clearance around the entire circumference of the grindstone mounting shaft portion 23a by forming the fitting introduction portion 23a1, the protruding amount of the fitting convex portion 23a2 can be reduced. Thereby, the rotation unbalance of the grindstone flange 23 can be reduced, and the balancing operation of the grindstone flange 23 becomes easy. In addition, the gap CL becomes small, and it is possible to make it difficult for foreign matters such as grinding scraps and coolant to enter the gap CL.

  Furthermore, by forming the relief portion 23a3, the grinding wheel 19 can be easily attached to the grinding wheel mounting shaft portion 23a with a small gap even if the grinding wheel 19 is slightly inclined when the grinding wheel 19 is inserted into the grinding wheel mounting shaft portion 23a. Can do. In addition, since the relief portion 23a3 is formed by being spaced apart from the fitting convex portion 23a2 by a predetermined amount in the axial direction, the fitting introducing portion 23a1 is arranged around the entire circumference between the fitting convex portion 23a2 and the relief portion 23a3. Even when the grinding wheel 19 is slightly inclined when the grinding wheel 19 is slid by the fitting introduction portion 23a1, the grinding wheel 19 is fitted to the fitting convex portion 23a2 by the guidance of the fitting introduction portion 23a1. Can be fitted smoothly.

  Further, since only the disc-shaped grinding wheel 19 needs to be replaced while the grinding wheel flange 23 is fixed to the grinding wheel shaft 20, the weight of the grinding wheel can be reduced, and the grinding wheel can be replaced easily and in a short time.

  As a result, in the grindstone manufacturer, the grindstone flange 23 having the above-described configuration is provided to the user who processes the workpiece using the grindstone 19 and is fixed to the grindstone shaft 20 of the grinding machine 10. Then, the grinding wheel 19 formed (truing) on the basis of the inner peripheral surface 25a and the finished grinding wheel 19 is replenished to the user as necessary from the grinding wheel manufacturer, so that the grinding wheel 19 having a small replacement weight can be obtained by the user. It can be installed easily and with concentric accuracy. Thereby, in the user, the time required for the setup change can be greatly shortened, and the production efficiency can be improved.

  When a normal grindstone is attached to the grindstone shaft 20 in place of the disc-shaped grindstone 19 made of a CBN grindstone, the grindstone sleeve is obtained by removing the grindstone flange 23 from the grindstone shaft 20 and holding the ordinary grindstone on the grindstone shaft 20. You just have to wear.

  6 and 7 show a second embodiment of the present invention. The difference from the first embodiment is that the fitting convex portion provided on the grindstone mounting shaft portion 23a side is replaced with a grindstone. This is a point provided on the inner peripheral side of the vehicle 19. Therefore, in the following, differences from the first embodiment will be mainly described, and the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  In FIG. 6 and FIG. 7, a grindstone fitting portion 23 a 5 is provided at the base end portion of the grindstone mounting shaft portion 23 a of the grindstone flange 23 with an axial length smaller than the axial width of the grindstone core 25 of the grinding wheel 19. It is formed over the entire circumference. In the grindstone mounting shaft portion 23a, a fitting introduction portion 23a1 having a slight step with the grindstone fitting portion 23a5 is formed concentrically with the grindstone fitting portion 23a5 over the shaft end of the grindstone mounting shaft portion 23a. . The outer diameter of the fitting introduction part 23a1 is set to be, for example, about 0.05 mm smaller than the outer diameter of the grindstone fitting part 23a5.

  At the end of the fitting introduction portion 23a1 of the grindstone mounting shaft portion 23a (shaft end of the grindstone mounting shaft portion 23a), a relief portion 23a3 having a smaller diameter than the fitting introduction portion 23a1 is provided in the axial direction from the grindstone fitting portion 23a5. It is formed at a circumferential position that is spaced apart by a certain amount and 180 degrees different from the up mark M2 over an angle range exceeding 180 degrees, for example, an angle range of about 270 degrees. The relief portion 23a3 is formed in an arc shape concentric with the fitting introduction portion 23a1, and its outer diameter is set to a small diameter, for example, about 0 or 1 mm with respect to the outer diameter of the fitting introduction portion 23a1.

  On the inner peripheral surface 25a of the grinding wheel 19 (grinding stone core 25), as shown in FIG. 7, there are 180 fitting protrusions 25a2 having substantially the same diameter as the outer diameter of the grinding wheel fitting portion 23a5 of the grinding wheel mounting shaft portion 23a. It is formed concentrically with the center of the grinding wheel 19 over an angle range θ of less than 90 degrees, for example, an angle range of 90 degrees. A relief arc portion 25a3 having a diameter larger than that of the fitting convex portion 25a2 is formed over an angular range exceeding 180 degrees on a portion of the inner peripheral surface 25a of the grinding wheel 19 excluding the fitting convex portion 25a2.

  When the grinding wheel 19 is attached to the grinding wheel mounting shaft portion 23a of the grinding wheel flange 23 by forming the fitting introduction portion 23a1, the grinding wheel mounting shaft is set with respect to the inner peripheral surface 25a of the grinding wheel 19 with respect to the center of the grinding wheel mounting shaft portion 23a. The grinding wheel 19 can be inserted in a state having a gap around the entire circumference of the portion 23a, so that the grinding wheel 19 can be easily attached to the grinding wheel mounting shaft portion 23a.

  Moreover, when the grinding wheel 19 is released after the grinding wheel 19 is inserted into the fitting introduction portion 23a1 of the grinding wheel mounting shaft portion 23a, the fitting convex portion 25a2 of the grinding wheel 19 is fitted into the grinding wheel mounting shaft portion 23a by gravity. Supported by the introduction portion 23a1, the grinding wheel 19 is positioned and supported perpendicular to the mounting axis direction. Accordingly, in this state, the grinding wheel 19 is moved toward the end face of the grinding wheel flange 23 while sliding on the fitting introduction portion 23a1, thereby easily fitting the fitting convex portion 25a2 of the grinding wheel 19 to the grinding wheel fitting portion 23a5. Can be fitted.

  That is, since the step size between the grindstone fitting portion 23a5 and the fitting introduction portion 23a1 is small (for example, 0.015 to 0.35 mm (preferably 0.025 mm)), the grinding wheel 19 is slid on the fitting introduction portion 23a1. By doing so, the fitting convex portion 25a2 of the grinding wheel 19 can be easily fitted to the grinding wheel fitting portion 23a5 of the grinding wheel mounting shaft portion 23a, and in this state, the fitting convex portion 25a2 of the grinding wheel 19 and A clearance CL is formed between the wheel fitting portion 23a5 and a half or more of the circumference, and the center of the grinding wheel 19 is aligned with the center of the wheel mounting shaft portion 23a, and thus the center of the grinding wheel shaft 20. , Centering accuracy is ensured.

  According to the second embodiment described above, even when the fitting convex portion 25a2 and the relief arc portion 25a3 are provided on the inner peripheral side of the grinding wheel 19, similarly to the first embodiment described above. By the fitting introduction part 23a1, the fitting convex part 25a2 of the grinding wheel 19 can be easily fitted to the grinding wheel fitting part 23a5 of the grinding wheel mounting shaft part 23a.

  Further, the relief portion 23a3 allows the grinding wheel 19 to be easily attached to the grinding wheel mounting shaft portion 23a with a small gap even if the grinding wheel 19 is slightly inclined when the grinding wheel 19 is inserted into the grinding wheel mounting shaft portion 23a. . Further, since the relief portion 23a3 is formed by being spaced apart from the grindstone fitting portion 23a5 by a predetermined amount in the axial direction, the fitting introduction portion 23a1 is disposed on the entire circumference between the grindstone fitting portion 23a5 and the relief portion 23a3. Even when the grinding wheel 19 is slightly inclined when the grinding wheel 19 is slid by the fitting introduction portion 23a1, the grinding wheel 19 is moved to the grinding wheel fitting portion 23a5 by the guidance of the fitting introduction portion 23a1. It can be fitted smoothly.

  Furthermore, since only the disc-shaped grinding wheel 19 needs to be replaced while the grinding wheel flange 23 is fixed to the grinding wheel shaft 20, the weight of the grinding wheel can be reduced, and the grinding wheel can be replaced easily and in a short time.

  In the above-described embodiment, the grinding wheel 19 is molded (truing) by the molding device 30 in advance outside the grinding machine 10, and the grinding wheel 19 after molding is placed on the grinding machine 10 with the same mounting standard as at the time of molding. Although an example of mounting is described, the present invention is not limited to the one in which the grinding wheel 19 attached to the grinding wheel mounting shaft portion 23a of the grinding wheel flange 23 is formed in advance by the molding device 30. When the grinding wheel 19 is not formed in advance by the molding device 30, it is not necessary to provide the mark M1 on the grinding wheel 19.

  In the above-described embodiment, the example in which the fitting introduction portion 23a1 and the relief portion 23a3 are arc-shaped concentric with the center of the grindstone flange 23 has been described. However, it is possible to change the shapes of the fitting introduction portion 23a1 and the escape portion 23a3 within a range that does not impair the functions.

  In addition, the diameter size difference and angle range of the fitting introduction part 23a1, the fitting convex part 23a2 (the grindstone fitting part 23a5), and the relief part 23a3 described in the embodiment are merely examples, for example. The relief portion 23a3 can sufficiently cope with the inclination of the grinding wheel 19 in the front-rear direction as long as the angle range is at least about 180 degrees.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention described in the claims. It is.

  The grinding wheel mounting device according to the present invention is suitable for use in a grinding machine that removably mounts a disc-shaped grinding wheel on a grinding wheel mounting shaft portion of a grinding wheel flange fixed to a grinding wheel shaft.

  DESCRIPTION OF SYMBOLS 10 ... Grinding machine, 17 ... Grinding wheel base, 19 ... Grinding wheel, 20 ... Grinding wheel shaft, 23 ... Grinding wheel flange, 23a ... Grinding wheel mounting shaft part, 23a1 ... Fitting introduction part, 23a2 ... Fitting convex part, 23a3 ... Relief part 23a5 ... Whetstone fitting portion, 24 ... Whetstone layer, 25 ... Whetstone core, 25a ... Inner peripheral surface, 25a2 ... Fitting convex portion, 25a3 ... Escape arc portion, 27 ... Bolt, 30 ... Molding device, M1 ... Alignment mark , M2 ... up mark.

Claims (9)

A mounting device for attaching a grinding wheel having a grinding wheel layer on the outer periphery to a grinding wheel flange detachably fixed to the outer periphery of the grinding wheel shaft,
The grindstone flange is provided with a grindstone mounting shaft portion for mounting the grindstone wheel,
On the outer periphery of the grindstone mounting shaft part, a fitting introduction part is formed,
An arcuate fitting convex portion is formed over the angular range of less than 180 degrees at the base end portion of the fitting introduction portion,
The fitting introduction portion is set to have a diameter smaller than the diameter of the fitting convex portion so that the grinding wheel can be smoothly guided in the vertical and horizontal directions and can smoothly run on the fitting convex portion. ,
It said grinding wheel, to form a center hole having a diameter which diameter concentrically with the matching fitting before Kihama convex portion,
On the shaft end side of the grindstone mounting shaft portion of the fitting introduction portion, a relief portion having a smaller radial dimension than the fitting introduction portion is separated from the fitting convex portion in the axial direction, and the fitting convex portion And over a predetermined angular range at a position facing in the circumferential direction,
In the state where the central hole of the grinding wheel is concentrically matched with the fitting convex portion of the grinding wheel mounting shaft portion, the grinding wheel is fixed to the end face of the grinding wheel flange.
A grinding wheel mounting apparatus characterized by the above. In claim 1,
An apparatus for attaching a grinding wheel in which the diameter of the fitting introduction part is 0.015 to 0.35 mm smaller than the diameter of the fitting convex part. The grinding wheel mounting device according to claim 1 or 2 , wherein the fitting introduction portion and the relief portion are formed in a cylindrical shape concentric with the fitting convex portion. 4. The grinding wheel mounting device according to claim 1 , wherein an up mark is provided on the grinding wheel flange at an angular position corresponding to the fitting convex portion. 5. 5. The grinding wheel mounted on the grinding wheel flange according to claim 4 , wherein an outer periphery of the grinding wheel layer is preliminarily formed on the basis of the center hole outside the machine, and the grinding wheel has an alignment corresponding to the up mark. Grinding wheel mounting device provided with a mark. A mounting device for attaching a grinding wheel having a grinding wheel layer on the outer periphery to a grinding wheel flange detachably fixed to the outer periphery of the grinding wheel shaft,
The grindstone flange is provided with a grindstone mounting shaft portion for mounting the grindstone wheel,
On the outer periphery of the grindstone mounting shaft part, a fitting introduction part is formed,
A center hole having a larger diameter than the diameter of the fitting introduction portion is formed in the grinding wheel,
An arc-shaped fitting convex portion having a diameter dimension that fits the grinding wheel concentrically with the diameter dimension of the grinding wheel fitting portion on the inner periphery of the center hole of the grinding wheel is an angle of less than 180 degrees. Forming over a range ,
The fitting introduction portion is set to have a diameter smaller than the diameter of the grinding wheel fitting portion so that the grinding wheel can be smoothly guided in the vertical and horizontal directions and can smoothly run on the grinding wheel fitting portion. ,
On the shaft end side of the grindstone mounting shaft portion of the fitting introduction portion, an escape portion having a smaller radial dimension than the fitting introduction portion is spaced apart from the grindstone fitting portion in the axial direction, and the grinding wheel Form a predetermined angular range at a position facing the fitting convex portion in the circumferential direction,
In the state where the fitting convex portion of the grinding wheel is concentrically matched to the grinding wheel fitting portion of the grinding wheel mounting shaft portion, the grinding wheel is fixed to the end face of the grinding wheel flange.
A grinding wheel mounting apparatus characterized by the above. In claim 6,
An apparatus for attaching a grinding wheel in which the diameter of the fitting introduction part is 0.015 to 0.35 mm smaller than the diameter of the fitting convex part. A mounting method for attaching a grinding wheel provided with a grinding wheel layer on the outer periphery to a grinding wheel flange detachably fixed to the outer periphery of the grinding wheel shaft,
The grindstone flange is provided with a grindstone mounting shaft portion for mounting the grindstone wheel,
On the outer periphery of the grindstone mounting shaft part, a fitting introduction part is formed,
An arcuate fitting convex portion is formed over the angular range of less than 180 degrees at the base end portion of the fitting introduction portion,
The fitting introduction portion is set to have a diameter smaller than the diameter of the fitting convex portion so that the grinding wheel can be smoothly guided in the vertical and horizontal directions and can smoothly run on the fitting convex portion. ,
It said grinding wheel, to form a center hole having a diameter which diameter concentrically with the matching fitting before Kihama convex portion,
On the shaft end side of the grindstone mounting shaft portion of the fitting introduction portion, a relief portion having a smaller radial dimension than the fitting introduction portion is separated from the fitting convex portion in the axial direction, and the fitting convex portion And over a predetermined angular range at a position facing in the circumferential direction,
The center hole of the grinding wheel is supported by the fitting introduction portion of the grinding wheel mounting shaft portion, and the grinding wheel is moved in the axial direction of the grinding wheel mounting guide while being guided by the fitting introduction portion. The center hole of the grinding wheel is concentrically matched with the fitting convex portion of the grinding wheel mounting shaft portion, and in this state, the grinding wheel is fixed to the end face of the grinding wheel flange.
A method of attaching a grinding wheel, characterized by the above. In claim 8,
A method for attaching a grinding wheel in which the diameter of the fitting introduction part is 0.015 to 0.35 mm smaller than the diameter of the fitting convex part.

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