JP5703761B2 - Truing method for grinding machine and grinding wheel - Google Patents

Description

  The present invention relates to a grinding machine including a truer for shaping the shape of a grinding wheel, and a truing method for a grinding wheel using a truer.

  For example, there is a stepped shaft-shaped workpiece in which portions having different outer diameters are provided in the axial direction. In some cases, the corners of the outer peripheral surface and the end surface of the workpiece are ground into a curved shape. For such a workpiece, a grinding wheel in which the cross-sectional shape of the grinding wheel in the rotation axis direction is formed into a curved shape such as an arc shape is used in order to simultaneously perform the plunge grinding of the end face and the corner portion. Sometimes. In order to form the grinding wheel, a rotary truer (sometimes generally referred to as a “rotary dresser”) may be used. When the arc-shaped portion of the grinding wheel is formed while rotating the rotary tool at the position where the rotary shaft of the rotary tool is fixed, the contact point of the rotary tool with the grinding wheel changes. For this reason, since the amount of molding at each contact point of the rotary truer is different, there arises a problem that the rotary truer is unevenly worn. As a result, due to variations in wear of the rotary truer, the shape of the grinding wheel is formed in a shape that deviates from the desired shape. If it does so, there exists a possibility that the shape accuracy of a workpiece may fall.

  In particular, in a composite grinding machine including a plurality of grinding wheels having different shapes, when a plurality of grinding wheels are formed by a single rotary truer, the wear of the rotary truer becomes more complicated and the shape accuracy of the grinding wheel decreases. There is a fear.

  A grinding machine equipped with such a rotary truer is described in, for example, Japanese Patent Laid-Open No. 2000-84852 (Patent Document 1). In Patent Document 1, in addition to a rotary truer (referred to as “rotary dress” in Patent Document 1), an NC that forms a grinding wheel while tilting around an axis orthogonal to the central axis of the grinding wheel. The dress is also described.

JP 2000-84852 A

  By the way, in general, a truer is very small in comparison with a grinding wheel, a grinding wheel head, a headstock, and the like due to the configuration of the grinding machine. This is because when a grinder grinds a workpiece with a grinding wheel, it must be installed so that it does not interfere with the grinding wheel and the workpiece. Furthermore, it is because it is required to reduce the size of the entire grinding machine as much as possible.

  And, in the case of adding a configuration for tilting around a shaft orthogonal to the central axis of the grinding wheel to a small tourer, the support stiffness of the tourer is compared with the support stiffness of the grinding wheel, the grinding wheel head and the headstock. It becomes very small. There is a possibility that vibration or the like may occur in the truer due to a decrease in support rigidity. In this case, the shape accuracy of the grinding wheel may be reduced.

  The present invention has been made in view of such circumstances, and it is possible to prevent the occurrence of uneven wear of the truer while ensuring the shape forming accuracy of the grinding wheel by sufficiently ensuring the support rigidity of the truer. An object of the present invention is to provide a grinding machine and a truing method for a grinding wheel.

(Grinder)
(Claim 1) A grinding machine of the present invention includes a bed, a workpiece support device that supports a workpiece rotatably around a first axis, and a grinding wheel that grinds the workpiece while rotating around a second axis. And a grinding wheel base that supports the grinding wheel rotatably about the second axis, which is the central axis of the grinding wheel, and is supported by the bed so as to be rotatable about a third axis orthogonal to the second axis. And the bed is provided at a position separated from the workpiece support device, and is provided at a position where the grinding wheel does not interfere with the grinding wheel and the grinding wheel base when the grinding wheel is ground. A truer that shapes the shape of the car, a moving body that is driven by a linear drive shaft and moves the workpiece support device and the grindstone table relative to each other, and the grindstone table that rotates about the third axis with respect to the bed The wheel in the grinding wheel Orientation of the truer with respect to the tangent of the authors and a control means for truing said grinding wheel such that the constant state.

(Claim 2) The movable body is driven by two orthogonal linear drive shafts to move the grindstone table in two axial directions perpendicular to the bed, and the grinding machine moves the tourer to a predetermined direction. You may make it provide the truer main body fixed to the position spaced apart from the said workpiece support apparatus among the said beds, supporting in a posture .
(Claim 3) The tourer may be configured such that the first axis, which is the central axis of the workpiece, is perpendicular to the first axis, and the third axis on which the grinding wheel base rotates with respect to the bed is used as a reference. You may make it locate in the opposite side to the position of one axis.
(Claim 4) The truer is a rotary truer formed in a disk shape and rotatably provided around a central axis of the disk shape, and the truer body has a central axis of the rotary truer that is the first axis and You may make it support the said rotary truer so that it may become an axis | shaft inclined with respect to the axis | shaft orthogonal to said 1st axis | shaft.

  (Claim 5) The truer is a rotary truer formed in a disk shape and rotatably provided around a central axis of the disk shape, and the control means is tangential to the rotary truer in the grinding wheel. Then, the grinding wheel may be trued while the grinding wheel base is rotated around the third axis so that the central axis of the rotary truer is in a parallel state.

(Truing method of grinding wheel)
(6) A truing method for a grinding wheel according to the present invention comprises a bed, a workpiece support device for rotatably supporting a workpiece around a first axis, and grinding the workpiece while rotating around a second axis. A grinding wheel that supports the grinding wheel so as to be rotatable about the second axis that is a central axis of the grinding wheel, and is supported by the bed so as to be rotatable about a third axis that is orthogonal to the second axis. A grinding wheel base and a position of the bed spaced apart from the workpiece support device, and the grinding wheel is provided at a position that does not interfere with the grinding wheel and the grinding wheel base when the grinding wheel is ground. A method for truing the grinding wheel in a grinding machine , comprising: a truer that shapes the shape of the grinding wheel; and a moving body that is driven by a rectilinear drive shaft to move the workpiece support device and the grinding wheel base relative to each other. And Wherein while the wheel head is rotated to the third axis, performing truing of the grinding wheel as the orientation of the truer is respect to the tangent a constant state of the truer in the grinding wheel with respect to.

  (Claim 1) According to the present invention, the grinding wheel base is supported by the bed so as to be rotatable around a third axis orthogonal to the second axis which is the central axis of the grinding wheel. Then, truing of the grinding wheel is performed such that the direction of the truer with respect to the tangent to the truer in the grinding wheel is constant while rotating the grinding wheel base around the third axis with respect to the bed. Therefore, the contact point of the truer with the grinding wheel can always be at a constant position, and as a result, the occurrence of uneven wear of the truer can be prevented. As a result, the shape forming accuracy of the grinding wheel can be improved.

  Here, in general, since the grinding wheel head needs to support the grinding wheel, it is very large compared to the truer. And the grinding machine of this invention is set as the structure which rotates a large grindstone stand around a 3rd axis | shaft with respect to a bed in this way. Furthermore, since the grinding wheel grinds a workpiece, unless the support rigidity of the grinding wheel is sufficiently ensured, the grinding accuracy of the workpiece is lowered. For these reasons, the support rigidity of the grinding wheel base is very large compared to the support rigidity of the truer. Therefore, even if a rotation mechanism around the third axis with respect to the bed is added to the grindstone table, the support rigidity of the grindstone table can be sufficiently secured.

  And as mentioned above, in order to always make the contact point with the grinding wheel in the truer a fixed position, the grinding wheel base can be rotated around the third axis with respect to the bed. Therefore, the tourer does not need to be configured to be rotatable around the third axis orthogonal to the central axis of the grinding wheel as in the prior art. Therefore, the support rigidity of the truer can be sufficiently increased as compared with the case where a configuration for rotating around the third axis as in the prior art is added. Therefore, according to the present invention, since the support rigidity of the grinding wheel base and the support rigidity of the truer can be sufficiently ensured, the shape forming accuracy of the grinding wheel can be improved by the truer.

  Furthermore, when the grinding wheel platform is configured to be rotatable about the third axis with respect to the bed, when the workpiece is ground by the grinding wheel, the second axis that is the central axis of the grinding wheel is used as the central axis of the workpiece. It can also be set as the state inclined with respect to the 1st axis which is. Thereby, taper surface grinding etc. can be performed easily, for example, and the freedom degree of a grinding aspect increases. Furthermore, if it is a grinding machine which grinds by rotating a grindstone base around a 3rd axis | shaft, the 3rd axis | shaft which rotates a grindstone bed with respect to a bed can be made shared in both truing and grinding. Therefore, it is not necessary to newly provide a dedicated third axis, and the above effect can be achieved.

In conventional grinding machines, the tourer is configured to be rotatable about an axis perpendicular to the central axis of the grinding wheel, and the grinding wheel is configured not to rotate about an axis perpendicular to the central axis of the grinding wheel relative to the bed. ing. And a truer must be installed in the area | region which does not interfere with the grinding wheel in the state which grinds a workpiece among the area | regions where a grinding wheel can move relatively. If it does so, in the grinding machine of the conventional structure, a truer must be installed in the vicinity of the headstock or the tailstock. As described above, the installation position of the truer is very limited.

  On the other hand, like the grinding machine of the present invention, the grindstone wheel supported by the grindstone table is configured so that the grindstone table can rotate about the third axis with respect to the bed. It can be rotated around three axes. Therefore, the movable region of the grinding wheel is expanded to a region where the grinding wheel rotates about the third axis. As a result, the degree of freedom of the installation location of the truer increases. In particular, the truer can be installed at a position away from a headstock or a tailstock as a workpiece support device. Thereby, when grinding a workpiece with a grinding wheel, it is possible to reduce the occurrence of interference between the grinding wheel and the grinding wheel base and the truer.

(Claim 2) By setting the grindstone to be moved with respect to the bed by driving the straight drive shaft, the truer can be fixed to the bed. Thereby, the support rigidity of the truer can be reliably increased. As a result, the shape forming accuracy of the grinding wheel can be further improved.
(Claim 3) In particular, the position of the first axis with respect to the position of the third axis where the grindstone bed rotates with respect to the bed in the direction orthogonal to the first axis which is the center axis of the workpiece. By being located on the opposite side, the occurrence of interference can be further reduced.
(Claim 5) By truing the grinding wheel while rotating the grinding wheel base around the third axis so that the central axis of the rotary tool is parallel to the tangent to the rotary tool in the grinding wheel, The outer peripheral surface of the rotary truer can be stably brought into contact with the grinding wheel. As a result, the shape forming accuracy of the grinding wheel can be further improved.

  (Claim 6) The present invention is based on the above grinding machine as a truing method for a grinding wheel. According to the truing method of the grinding wheel, the same effects as those obtained by the grinding machine described above can be obtained. Further, the other features of the grinding machine described above can also be applied to the invention relating to the truing method of the grinding wheel. In this case, the same effect as that of the corresponding grinding machine can be obtained.

1 is a plan view of a composite grinding machine. It is a top view of the compound grinding machine which shows the state which is truing the axial direction one end of a grinding wheel. It is a top view of the compound grinding machine which shows the state which is truing the axial direction center part of a grinding wheel. It is a top view of the compound grinding machine which shows the state which is truing the axial direction other end of a grinding wheel. 2nd embodiment: It is a top view of a composite grinding machine. It is a top view of the compound grinding machine which shows the state which is truing the axial direction one end of a grinding wheel.

<First embodiment>
(Composition of compound grinding machine)
The composite grinding machine will be described with reference to FIG. As shown in FIG. 1, the composite grinding machine 1 will be described by taking as an example a configuration in which the grinding wheel platform traverse type, that is, the grinding wheel platform moves in the direction of the rotation axis of the workpiece with respect to the bed. The composite grinding machine 1 includes a bed 10, a workpiece support device 20, a grindstone support device 30, a truer device 70, and a control device 80.

  The bed 10 is formed in a substantially rectangular shape, for example, and is fixed on the floor. On the upper surface of the bed 10, two grinding wheel base traverse guide rails 11 on which the grinding wheel support device 30 can slide extend in the left-right direction (Z-axis direction) in FIG. 1 and are parallel to each other. Is formed. Further, the bed 10 has a grinding wheel support Z-axis ball screw 12 for driving the grinding wheel support device 30 in the left-right direction in FIG. Corresponding to a "straight drive shaft"), and a grinding wheel base Z-axis motor 13 that rotationally drives the grinding wheel base Z-axis ball screw 12 is disposed.

  The workpiece support device 20 supports the workpiece W in a rotatable manner. In the present embodiment, the workpiece W exemplifies a stepped shaft-like member in which portions having different outer diameters are provided in the axial direction. In particular, the workpiece W is formed in a concave curved surface shape such as a circular arc concave shape at the corner between the stepped end surface and the outer peripheral surface. The workpiece support device 20 supports both ends of the workpiece W so as to be rotatable around the central axis A of the workpiece W (corresponding to the “first axis” in the present invention). The workpiece support device 20 includes a headstock 21 that supports one end of the workpiece W, and a tailstock 22 that supports the other end of the workpiece W. The workpiece support device 20 is provided on the upper surface of the bed 10 at a position facing the front side of the grinding wheel base traverse guide rail 11 (lower side in FIG. 1), and the axial direction of the workpiece W is the Z-axis direction. It is provided to become.

  The grindstone support device 30 includes a grindstone base traverse base 40 (corresponding to “moving body” in the present invention), a grindstone base X-axis base 50 (corresponding to “moving body” in the present invention), a composite grindstone base 60, It has. The grinding wheel base traverse base 40 is formed in a rectangular flat plate shape, and is disposed on the upper surface of the bed 10 so as to be slidable on the grinding wheel base traverse guide rail 11 in the Z-axis direction (left and right direction in FIG. 1). ing. The wheel head traverse base 40 is connected to a nut member of the wheel head Z-axis ball screw 12 and is traversed along the wheel head traverse guide rail 11 by driving the wheel head Z-axis motor 13. That is, the grindstone traverse base 40 moves in the direction of the central axis A of the workpiece W with respect to the bed 10. Two X-axis guide rails 41 on which the grinding wheel base X-axis base 50 can slide are extended on the upper surface of the grinding wheel base traverse base 40 so as to extend in the vertical direction (X-axis direction) in FIG. It is formed in parallel with. Further, the wheel head traverse base 40 includes an X-axis ball screw 42 (“straight drive shaft” in the present invention) for driving the wheel head X-axis base 50 in the vertical direction of FIG. 1 between the X-axis guide rails 41. Is disposed), and an X-axis motor 43 that rotationally drives the X-axis ball screw 42 is disposed.

  The grinding wheel base X-axis base 50 is formed in a rectangular flat plate shape, and can slide on the X-axis guide rail 41 in the X-axis direction (vertical direction in FIG. 1) on the upper surface of the grinding wheel base traverse base 40. Has been placed. The grindstone base X-axis base 50 is connected to the nut member of the X-axis ball screw 42, and moves along the X-axis guide rail 41 by driving the X-axis motor 43.

  The composite grinding wheel head 60 includes a grinding wheel head main body 61, a grinding wheel base rotating mechanism 62, a first grinding wheel 63, a second grinding wheel 64, and grinding wheel rotating motors 65 and 66. The grinding wheel base body 61 is provided on the upper surface of the grinding wheel base X-axis base 50. That is, the grindstone base body 61 can move relative to the workpiece W supported by the workpiece support device 20 in the X-axis direction and the Z-axis direction. Further, the grinding wheel head main body 61 is rotated by the grinding wheel head rotation mechanism 62 with respect to the grinding wheel head X-axis base 50 around the grinding wheel head rotation axis B (the Y axis of the normal to the paper surface of FIG. ”). The rotation axis B of the grindstone rotation mechanism 62 is located near the center of the grindstone table X-axis base 50. Further, the first grinding wheel 63 and the second grinding wheel 64 are equivalent to the horizontal axes C1 and C2 (the “second axis” in the present invention) on the outer peripheral side of the grinding wheel base body 61 around the rotation axis B. ) To be rotatable around.

  The second grinding wheel 64 is provided at a position that is symmetrical with respect to the grinding wheel base rotation axis B with respect to the position of the first grinding wheel 63. That is, the first grinding wheel 63 and the second grinding wheel 64 are selectively in a state where the workpiece W can be ground. Further, the grinding wheel base body 61 is provided with grinding wheel rotating motors 65 and 66 that can rotate the first grinding wheel 63 and the second grinding wheel 64, respectively. Here, the outer peripheral surface shape of the first grinding wheel 63 and the second grinding wheel 64 is such that the stepped end surface of the workpiece W and the corner of the concave curved surface shape can be simultaneously performed by one plunge grinding. For example, it is formed in a curved convex shape such as an arc convex shape. However, in the drawings, the outer peripheral surfaces of the first grinding wheel 63 and the second grinding wheel 64 are exaggerated from the curved convex shape. Further, the outer diameter of the first grinding wheel 63 and the outer diameter of the second grinding wheel 64 may be the same or different. Alternatively, the first grinding wheel 63 may be used for roughing and the second grinding wheel 64 may be installed for finishing.

  The truer device 70 is a rotary truer device that shapes the shape of the grinding wheels 63 and 64. The truer device 70 includes a truer body 71 and a rotary truer 72. The truer body 71 is provided in the bed 10 at a position separated from the workpiece support device 20. Specifically, the truer body 71 is configured such that the center of the workpiece W is based on the position of the grinding wheel base rotation axis B where the composite grinding wheel base 60 rotates with respect to the bed 10 in the direction orthogonal to the central axis A of the workpiece W. It is located opposite to the position of the axis A (upper side in FIG. 1). In the present embodiment, the truer main body 71 is positioned so as to face the headstock 21 in the X-axis direction, and is disposed so as to interpose the grinding wheel head traverse guide rail 11 between the headstock 21. Yes.

  The rotary truer 72 is formed in a disk shape and has an outer peripheral surface formed of diamond or the like, and is supported by the truer body 71 so as to be rotatable around a disk-shaped central axis D. A rotary axis D (disk-shaped central axis) of the rotary truer 72 is an axis inclined with respect to the X axis and the Z axis.

  The control device 80 performs NC control on the rotation of the spindle of the spindle stock 21, the X-axis position and the Z-axis position of the composite grinding wheel platform 60, and the rotation angle of the composite grinding wheel platform 60. Further, the control device 80 rotates the grinding wheel rotating motors 65 and 66 for rotating the grinding wheel of the first grinding wheel 63 and the second grinding wheel 64 to rotate the rotary tool 72. That is, after positioning the composite grinding wheel base 60 by the grinding wheel base rotating mechanism 62 by the control device 80, the X of the composite grinding wheel base 60 with respect to the workpiece W is rotated while rotating any of the grinding wheels 63 and 64 for grinding. The outer peripheral surface of the workpiece W is ground by controlling the axial position and the Z-axis position. Further, the control device 80 performs NC control on the X-axis position and the Z-axis position of the composite grinding wheel base 60 and the rotation angle of the composite grinding wheel base 60 in a state where the rotary tourer 72 is rotated, and the first grinding wheel 63. Alternatively, the shape of the second grinding wheel 64 is formed by the rotary truer 72.

(Truing method)
Next, a truing method of the first grinding wheel 63 in the above-described composite grinding machine 1 will be described with reference to FIGS. Here, although the truing method of the 1st grinding wheel 63 is demonstrated, since it is the same also about the 2nd grinding wheel 64, description is abbreviate | omitted about the truing method of the 2nd grinding wheel 64. FIG.

  First, the rotation of the rotary truer 72 is started by the control device 80. Next, the first grindstone as shown in FIG. 2 is obtained by rotating the composite grindstone base 60 by the grindstone base rotating mechanism 62 of the composite grindstone head 60 and moving the X-axis position and the Z-axis position of the composite grindstone base 60. The relative position and relative posture between the car 63 and the rotary truer 72 are set. That is, one axial end portion of the outer peripheral surface of the first grinding wheel 63 comes into contact with the rotary truer 72. At this time, at one axial end portion of the outer peripheral surface of the first grinding wheel 63, the rotational axis D (disk-shaped central axis) of the rotary truer 72 is tangent E to the rotary truer 72 at one axial end portion. They are in a parallel state.

  Subsequently, the outer peripheral surface of the first grinding wheel 63 is formed in the axial direction by the rotary tourer 72 while synchronizing the rotation of the composite grinding wheel base 60 and the movement of the composite grinding wheel base 60 in the X-axis direction and the Z-axis direction. To go. As shown in FIG. 3, the axially central portion of the outer peripheral surface of the first grinding wheel 63 comes into contact with the rotary truer 72. Also during this time, at the one axial end portion of the outer peripheral surface of the first grinding wheel 63, the rotational axis D of the rotary truer 72 is in a state parallel to the tangent line E with the rotary truer 72 at the one axial end portion. ing.

  Subsequently, the outer peripheral surface of the first grinding wheel 63 is further formed in the axial direction by the rotary tourer 72 while synchronizing the rotation of the composite grinding wheel head 60 and the movement of the composite grinding wheel base 60 in the X-axis direction and the Z-axis direction. I will do it. As shown in FIG. 4, the other axial end of the outer peripheral surface of the first grinding wheel 63 comes into contact with the rotary truer 72. Also during this time, at the one axial end portion of the outer peripheral surface of the first grinding wheel 63, the rotational axis D of the rotary truer 72 is in a state parallel to the tangent line E with the rotary truer 72 at the one axial end portion. ing.

  In this way, the outer peripheral surface of the first grinding wheel 63 is formed into a curved convex shape in the axial direction. While the molding is being performed, the direction of the rotary tourer 72 with respect to the tangent E to the rotary tourer 72 in the first grinding wheel 63 is adjusted while rotating the composite grinding wheel base 60 around the wheel base rotation axis B with respect to the bed 10. The truing of the first grinding wheel 63 is performed so as to be in a certain state.

(effect)
In this way, the composite grinding wheel head 60 is supported on the bed 10 so as to be rotatable about the grinding wheel head rotation axis B orthogonal to the central axis C1 of the first grinding wheel 63 and the central axis C2 of the second grinding wheel 64. Has been. The truing of the first and second grinding wheels 63 and 64 is performed by rotating the composite grinding wheel base 60 around the third axis with respect to the bed 10 and the rotary tourer 72 in the first and second grinding wheels 63 and 64. This is performed so that the orientation of the rotary truer 72 with respect to the tangent line E is constant. Therefore, the contact point between the rotary tourer 72 and the first and second grinding wheels 63 and 64 can always be at a fixed position, and as a result, the occurrence of uneven wear of the rotary tourer 72 can be prevented.

  Here, since the composite grinding wheel base 60 needs to support the first and second grinding wheels 63 and 64, it is formed in a very large size as compared with the rotary tourer 72. The composite grinding machine 1 is configured to rotate the large composite grinding wheel base 60 around the grinding wheel base rotation axis B with respect to the bed 10 in this way. Furthermore, since the first and second grinding wheels 63 and 64 grind the workpiece W, if the support rigidity of the first and second grinding wheels 63 and 64 is not sufficiently secured, Grinding accuracy will decrease. For these reasons, the support rigidity of the composite grinding wheel base 60 is very large compared to the support rigidity of the rotary truer 72. Therefore, even if a rotation mechanism around the grindstone rotation axis B with respect to the bed 10 is added to the composite grindstone table 60, the support rigidity of the composite grindstone table 60 can be sufficiently secured.

  And in order to always make the contact with the 1st and 2nd grinding wheels 63 and 64 in the rotary truer 72 be a fixed position, the compound grinding wheel base 60 can be rotated around the grinding wheel base rotation axis B with respect to the bed 10. I have to. Therefore, the rotary tourer 72 need not be configured to be rotatable around an axis orthogonal to the central axes C1 and C2 of the first and second grinding wheels 63 and 64. Therefore, the support rigidity of the rotary truer 72 can be sufficiently increased as compared with the case where a configuration for rotating around the axis is added. Therefore, since the support rigidity of the composite grinding wheel base 60 and the support rigidity of the rotary truer 72 can be sufficiently ensured, the shape forming accuracy of the first and second grinding wheels 63 and 64 can be improved by the rotary truer 72.

  Furthermore, when the workpiece W is ground by the first and second grinding wheels 63 and 64 by making the composite grinding wheel platform 60 rotatable about the grinding wheel platform rotation axis B with respect to the bed 10, As shown in FIG. 1, the center axes C1 and C2 of the first and second grinding wheels 63 and 64 can be inclined with respect to the center axis A of the workpiece W. Thereby, taper surface grinding etc. can be performed easily, for example, and the freedom degree of a grinding aspect increases. Further, as described above, in the case of the composite grinding machine 1 that performs grinding by rotating the composite grinding wheel base 60 around the grinding wheel base rotation axis B with respect to the bed 10, the composite grinding wheel base 60 for both truing and grinding. The grindstone base rotation axis B that rotates the bed 10 with respect to the bed 10 can be shared. Therefore, it is not necessary to newly provide a dedicated shaft, and the above effect can be achieved.

  Moreover, the 1st and 2nd grinding wheels 63 and 64 currently supported by the composite grinding wheel base 60 are made into the bed by making the composite grinding wheel base 60 the structure which can rotate the grinding wheel base rotating shaft B with respect to the bed 10. 10 can rotate about the grindstone rotation axis B. Accordingly, the movable area of the first and second grinding wheels 63 and 64 is expanded to the area where the first and second grinding wheels 63 and 64 rotate around the axis B. As a result, the degree of freedom of the installation position of the rotary truer 72 increases. In particular, the rotary truer 72 can be installed at a position away from the headstock 21 and the tailstock 22 as the workpiece support device 20. Thereby, when the workpiece W is ground by the first and second grinding wheels 63 and 64, it is possible to reduce the occurrence of interference between the first and second grinding wheels 63 and 64 and the grinding wheel base body 61 and the rotary tourer 72. .

  In particular, the workpiece is determined with reference to the position of the wheel head rotation axis B where the compound wheel head 60 rotates with respect to the bed 10 in the direction orthogonal to the center axis A of the workpiece W (X-axis direction). By being located on the side opposite to the position of the central axis A of W, occurrence of interference can be further reduced.

  Furthermore, the rotary truer 72 can be fixed to the bed 10 by moving the composite grinding wheel base 60 to the X axis and the Z axis with respect to the bed 10. Thereby, the support rigidity of the rotary truer 72 can be reliably increased. As a result, the shape forming accuracy of the first and second grinding wheels 63 and 64 can be further improved. Furthermore, the composite grindstone table 60 is rotated around the third axis B so that the central axis D of the rotary truer 72 is parallel to the tangent line E with the rotary truer 72 in the first and second grinding wheels 63 and 64. By performing truing of the first and second grinding wheels 63 and 64 while rotating them, the outer peripheral surface of the rotary truer 72 can be stably brought into contact with the first and second grinding wheels 63 and 64. Also from this, the shape forming accuracy of the first and second grinding wheels 63 and 64 can be further improved.

<Second embodiment>
(Composition of compound grinding machine)
The composite grinding machine will be described with reference to FIG. As shown in FIG. 5, the composite grinding machine 100 will be described taking a table traverse type, that is, a configuration in which the workpiece support device moves in the direction of the rotation axis of the workpiece with respect to the bed. The composite grinding machine 100 includes a bed 110, a table 190, a workpiece support device 120, a grindstone support device 130, a truer device 170, and a control device 180. Here, the same code | symbol is attached | subjected about the structure same as the composite grinding machine 1 of 1st embodiment among the composite grinding machines 100 of 2nd embodiment, and description is abbreviate | omitted.

  The bed 110 is formed in a T shape, for example, and is fixed on the floor. Two table traverse guide rails 111 on which the table 190 is slidable are arranged in the left-right direction (Z-axis direction) in FIG. It extends so as to be parallel to each other. Further, the bed 110 has a table Z-axis ball screw 112 (the “straight drive shaft” in the present invention) for driving the table 190 in the left-right direction in FIG. 5 between two table traverse guide rails 111. And a table Z-axis motor 113 that rotationally drives the table Z-axis ball screw 112 is disposed.

  Further, two X-axis guide rails 114 on which the grindstone base X-axis base 50 can slide are provided in the X-width direction back portion (upper portion in FIG. 5) of the upper surface of the bed 110 in the vertical direction in FIG. They are formed so as to extend in the (X-axis direction) and parallel to each other. Further, the bed 110 has an X-axis ball screw 115 (corresponding to the “straight drive shaft” in the present invention) for driving the grinding wheel base X-axis base 50 in the vertical direction of FIG. 5 between the X-axis guide rails 114. And an X-axis motor 116 that rotationally drives the X-axis ball screw 115 is disposed.

  The table 190 is formed in a rectangular flat plate shape, and is arranged on the table traverse guide rail 111 on the upper surface of the bed 110 so as to be slidable in the Z-axis direction (left-right direction in FIG. 5). The table 190 is connected to a nut member of the table Z-axis ball screw 112, and is traversed along the table traverse guide rail 111 by driving the table Z-axis motor 113. That is, the table 190 moves in the direction of the central axis A of the workpiece W with respect to the bed 110.

The workpiece support device 120 rotatably supports the workpiece W. The workpiece support device 120 includes a spindle stock 121 that supports one end of the workpiece W, and a tailstock 122 that supports the other end of the workpiece W. The workpiece support device 120 is provided at a position facing the upper surface of the table 190 so that the axial direction of the workpiece W is the Z-axis direction.
The grindstone support device 130 includes a grindstone base X-axis base 50 (corresponding to a “moving body” in the present invention) and a composite grindstone base 60. Here, the grindstone base X-axis base 50 and the composite grindstone base 60 are the same as those in the first embodiment, and thus description thereof is omitted.

  The truer device 170 is a rotary truer device that shapes the shape of the grinding wheels 63 and 64. The truer device 170 includes a truer body 171 and a rotary truer 172. The truer body 171 is fixed to the upper surface of the table 190 or the headstock 121. The rotation axis D of the rotary truer 172 is an axis that coincides with the Z axis.

  The control device 180 NC-controls the Z-axis position of the table 190, the rotation of the spindle of the headstock 121, the X-axis position of the composite grinding wheel base 60, and the rotation angle of the composite grinding wheel base 60. Further, the control device 180 rotates the rotary wheel 172 by rotating the grinding wheel rotating motors 65 and 66 that rotate and drive the grinding wheel of the first grinding wheel 63 and the second grinding wheel 64. That is, after positioning the composite wheel head 60 by the wheel head rotating mechanism 62 by the control device 180, the X of the composite wheel base 60 with respect to the workpiece W is rotated while rotating any of the grinding wheels 63 and 64 for grinding. The outer peripheral surface of the workpiece W is ground by controlling the shaft position and the Z-axis position of the table 190. Further, the control device 180 performs NC control on the X-axis position of the composite grinding wheel base 60, the Z-axis position of the table 190, and the rotation angle of the composite grinding wheel base 60 while the rotary tourer 172 is rotated. The shape of the grinding wheel 63 or the second grinding wheel 64 is formed by the rotary truer 72.

(Truing method)
Next, a truing method of the first grinding wheel 63 in the above-described composite grinding machine 100 will be described with reference to FIG. The rotation of the rotary truer 172 is started by the control device 180. Subsequently, by rotating the composite grinding wheel base 60 by the grinding wheel base rotation mechanism 62 of the composite grinding wheel base 60 and moving the X-axis position of the composite grinding wheel base 60 and the Z-axis position of the table 190, as shown in FIG. The relative position and relative posture between the first grinding wheel 63 and the rotary truer 172 are set. That is, one axial end portion of the outer peripheral surface of the first grinding wheel 63 is in contact with the rotary truer 172. At this time, at the one axial end portion of the outer peripheral surface of the first grinding wheel 63, the rotational axis D of the rotary truer 172 is parallel to the tangent line E with the rotary truer 172 at the one axial end portion. ing.

  Subsequently, in the same manner as the truing method described in the first embodiment, the outer peripheral surface of the first grinding wheel 63 is formed in the axial direction by the rotary tourer 172. During this time, the rotation of the composite grinding wheel base 60, the movement of the composite grinding wheel base 60 in the Z-axis direction, and the movement of the table 190 in the X-axis direction are performed in synchronization.

  According to the present embodiment, as in the first embodiment, since the support rigidity of the composite grinding wheel base 60 and the support rigidity of the rotary tourer 172 can be sufficiently ensured, the first and second grinding wheels 63 and 64 are secured by the rotary tourer 172. The shape forming accuracy can be improved.

<Others>
In the said embodiment, although demonstrated taking the case of the composite grinding machine containing two grinding wheels, it is applicable similarly to the grinding machine which has one grinding wheel. Moreover, although the case where the rotary truer device is applied as the truer device has been described, a monolithic truer can also be applied.

DESCRIPTION OF SYMBOLS 1,100: Compound grinding machine 10, 110: Bed 11: Guide rail for grinding wheel base traverse, 12: Z axis ball screw for grinding wheel base 13, Z axis motor 20 for grinding wheel base, 120: Workpiece support device, 21, 121: spindle head, 22, 122: tailstock 30, 130: grinding wheel support device 40: grinding wheel base traverse base, 41: X axis guide rail, 42: X axis ball screw 43: X axis motor, 50: grinding wheel base X Axis base 60: Compound grindstone head, 61: Grinding wheel head main body, 62: Wheel head rotating mechanism 63, 64: Grinding wheel, 65, 66: Wheel rotating motor 70: Truer device, 71: Truer main body, 72: Rotary tourer 80 , 180: Control device 111: Guide rail for table traverse, 112: Z-axis ball screw for table 113: Z-axis motor for table, 114: X-axis guide rail 115: X-axis ball screw, 116: X-axis motor 170: truer device, 171: truer body 172: Rotary truer 190: Table

Claims (6)

Bed and
A workpiece support device for rotatably supporting the workpiece around the first axis;
A grinding wheel for grinding the workpiece while rotating around a second axis;
A grinding wheel base that supports the grinding wheel rotatably about the second axis, which is the central axis of the grinding wheel, and is supported by the bed so as to be rotatable about a third axis orthogonal to the second axis;
The bed is provided at a position separated from the workpiece support device, provided at a position where the grinding wheel does not interfere with the grinding wheel and the grinding wheel base when the grinding wheel is ground, and the grinding wheel of the grinding wheel A truer that shapes the shape,
A movable body driven by a rectilinear drive shaft and relatively moving the workpiece support device and the grindstone table;
Control means for truing the grinding wheel so that the orientation of the truer with respect to the tangent to the truer in the grinding wheel is constant while rotating the grinding wheel base with respect to the bed. When,
A grinding machine comprising In claim 1,
The moving body is driven by two orthogonal linear drive shafts to move the grindstone table in two axial directions orthogonal to the bed,
The grinding machine includes a truer body that supports the truer in a predetermined posture and is fixed to a position of the bed that is separated from the workpiece support device. In claim 1 or 2,
The truer has a position of the first axis on the basis of a position of the third axis where the grindstone table rotates with respect to the bed in a direction orthogonal to the first axis which is a central axis of the workpiece. Is a grinding machine located on the opposite side.   In claim 2,
  The truer is a rotary truer that is formed in a disc shape and is provided to be rotatable around a central axis of the disc shape,
  The truer body is a grinding machine that supports the rotary truer so that a central axis of the rotary truer is an axis inclined with respect to the first axis and an axis perpendicular to the first axis. In any one of Claims 1-3 ,
The truer is a rotary truer that is formed in a disc shape and is provided to be rotatable around a central axis of the disc shape,
The control means is configured to rotate the grinding wheel head around the third axis so that the central axis of the rotary tool is parallel to a tangent to the rotary tool in the grinding wheel. Grinding machine for truing. Bed and
A workpiece support device for rotatably supporting the workpiece around the first axis;
A grinding wheel for grinding the workpiece while rotating around a second axis;
A grinding wheel base that supports the grinding wheel rotatably about the second axis, which is the central axis of the grinding wheel, and is supported by the bed so as to be rotatable about a third axis orthogonal to the second axis;
The bed is provided at a position separated from the workpiece support device, provided at a position where the grinding wheel does not interfere with the grinding wheel and the grinding wheel base when the grinding wheel is ground, and the grinding wheel of the grinding wheel A truer that shapes the shape,
A movable body driven by a rectilinear drive shaft and relatively moving the workpiece support device and the grindstone table;
A truing method for the grinding wheel in a grinding machine comprising:
A grinding wheel that performs truing of the grinding wheel so that the direction of the truer with respect to the tangent to the truer in the grinding wheel is constant while rotating the grinding wheel base with respect to the bed. Truing method.

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