JP2011148043A - Method for truing grinding tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for truing a grinding tool which can true a grinding tool having a peripheral machining surface comprising a plurality of surfaces and can ensure high shape accuracy of the machining surface of the grinding tool while minimizing wear of a truing wheel. <P>SOLUTION: In a grinding machine 1, X-axis and Z-axis movements of a grinding tool 10 are synchronized with a C-axis movement of a truing wheel 11 to turn a convex contact surface 11a of the truing wheel 11 relative to a machining surface 10a of the grinding wheel 10, so that the substantially entire arc of the contact surface 11a is brought in contact with the machining surface 10a, and the truing wheel 11 is turned on the machining surface 10a by a predetermined number of times to cut into the machining surface 10a by a predetermined depth at both turning ends. The grinding tool 10 and the truing wheel 11 have the substantially same hardness, and the number of revolutions is controlled to make the circumferential speed of the truing wheel 11 faster than that of the grinding tool 10 at contact points 10b and 11b between the machining surface 10a of the grinding tool 10 and the contact surface 11a of the truing wheel 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a shaping method for a grinding tool, and more particularly to a shaping method for a grinding tool having a work surface composed of a plurality of surfaces on an outer peripheral surface.

  Conventionally, as a shaping method of a grinding tool having a machining surface composed of a plurality of surfaces that are not a single shape on the outer peripheral surface, a method using a general shaping wheel having a reverse shape of the machining surface is generally used. If there are many types, the same number of total shaped grinding wheels are required, and a great tool cost is required. In addition, in the case of a grinding tool used for grinding a workpiece made of a hard material such as hardened steel or super steel, it is shaped by dropping the abrasive bonding material part with the WA grinding stone of the shaping grindstone. Therefore, the WA grindstone also wears violently, and it is frequently necessary to correct the shape of the shaping grindstone (truing). For this reason, there is a problem that the shape check operation takes a long time.

  In such a case, using a diamond wheel having an outer peripheral surface formed into a convex curved surface, profile grinding is performed in which the convex curved surface is brought into contact with the processing surface of the grinding tool and copied. In this method, a diamond wheel having an outer peripheral surface formed into a convex curved surface is attached to a grinding wheel base of a profile grinder for grinding. The diamond wheel is a very clogged grindstone with high wear resistance, so there is a problem in sharpness, and the radius of the convex curved surface is made as small as possible to reduce grinding resistance. However, if a large grinding area such as a machining surface composed of a plurality of surfaces as described above is profile-ground at a limited contact point of the convex curved surface, the progress of wear of a part of the convex curved surface is accelerated, and the machining surface There was a problem of adversely affecting the shape accuracy.

  Therefore, as a technique for reducing the wear of the grindstone as much as possible, Patent Document 1 discloses a grinding method in which a grindstone base is turned to continuously change the contact portion between the grindstone and the workpiece. In this method, a grinding wheel having a convex curved outer peripheral surface is mounted on a grinding wheel base, the grinding wheel base is swung to swing the shaping grinding stone, and brought into contact with the concave spherical surface of the end face of the workpiece attached to the tool spindle. It is a method to do.

JP 2000-24898 A

  However, the method described in Patent Document 1 is a grinding method of an end face, and the center of the convex curved surface is a relative swing center, and the swing center is always located on the spindle axis. There is a problem that cannot be applied as a method of shaping the machined surface.

  Therefore, in view of the above problems, the present invention can shape a grinding tool having a plurality of machining surfaces on the outer peripheral surface, and can ensure high shape accuracy of the machining surface of the grinding tool while minimizing wear of the shaping wheel. It aims at providing the shaping method of a tool.

  In order to achieve the above object, the first problem solving means includes at least the X axis, the Z axis orthogonal to the X axis, and the respective movement axes in the three directions of the C axis that revolves around the axis orthogonal to the Z axis. A tool spindle that is a rotation axis parallel to the Z axis, and a grindstone rotation axis that is orthogonal to the swivel axis of the C axis and that can be swung in the C axis direction. A method of shaping a grinding tool performed by a grinding machine that is relatively movable in the axial direction and the Z-axis direction, wherein the outer peripheral surface is formed into a convex curved surface in a grinding tool having a processing surface composed of a plurality of surfaces In the shaping method of a grinding tool performed by contacting the formed shaping wheel, the grinding tool is attached to the tool spindle, the shaping wheel is attached to the grindstone rotating shaft, and the C orthogonal to the X axis and the Z axis Synchronize the movement of the X-axis and Z-axis with the movement of the axis. The curved surface is oscillated relatively to each of the surfaces forming the processing surface, and approximately the entire arc of the convex curved surface is brought into contact with the surface forming the processing surface, and a shaping grindstone is provided on each of the surfaces forming the processing surface. The position where the convex curved surface passes through both ends of the surface forming the machining surface is the rocking end, and a predetermined amount of cut is sequentially given to the surface forming the machining surface at both rocking ends. It is.

  Further, the second problem solving means is that the grinding tool and the shaping grindstone have substantially the same hardness, the number of rotations of the tool spindle and the number of rotations of the grindstone are controlled, and the processing surface of the grinding tool and the shaping grindstone That is, the peripheral speed of the shaping grindstone at the contact point with the convex curved surface is made faster than the peripheral speed of the grinding tool.

In the invention of claim 1 of the present application, the grinding tool is attached to the tool spindle, the shaping grindstone is attached to the grindstone rotating shaft, and the X axis is moved to the C axis movement perpendicular to the X axis and Z axis. And the movement of the Z-axis is synchronized so that the convex curved surface is oscillated relative to each of the surfaces forming the processing surface, and substantially the entire arc of the convex curved surface is brought into contact with the surface forming the processing surface, Shaping the shaping grindstone a predetermined number of times on each surface forming the machining surface, the position where the convex curved surface has passed through both ends of the surface forming the machining surface as the rocking end, and the surface forming the machining surface at both rocking ends On the other hand, a predetermined amount of cut was sequentially given.
In the invention of claim 2 of the present application, the grinding tool and the shaping grindstone have substantially the same hardness, the number of revolutions of the tool spindle and the number of revolutions of the grinding wheel rotation axis are controlled, and the processing surface of the grinding tool and the shaping are shaped. The peripheral speed of the shaping wheel at the point of contact with the convex curved surface of the grinding wheel was made faster than the peripheral speed of the grinding tool.
According to these, it is possible to shape a grinding tool having a machining surface composed of a plurality of surfaces on the outer peripheral surface, and to make contact with the substantially entire area of the convex curved surface of the shaping whetstone evenly, while suppressing the wear of the shaping whetstone as much as possible. High shape accuracy of the machined surface can be secured. In addition, even if the grinding tool and the shaping stone have substantially the same hardness, the circumferential speed of the shaping wheel is made faster than the circumferential speed of the grinding tool, By increasing the hardness, wear can be suppressed as much as possible, and the life of the orthopedic grinding wheel can be extended.

1 is an overall view of a grinding machine that is an embodiment of the present invention. It is the figure which moved the grinding tool of FIG. 1 to the X-axis and Z-axis direction. It is the elements on larger scale which show the positional relationship which a grinding tool and a shaping grindstone contact, and is the figure which showed relatively the movement of the shaping grindstone in order from (A) to (E). FIG. 4 is a partially enlarged view of FIG. 2, showing the positional relationship between the grinding tool and the shaping grindstone in FIG.

  Embodiments of the present invention will be described with reference to FIGS. The grinding machine 1 is a machine tool for grinding a workpiece such as a grinding tool. The grinding machine 1 is provided with a Z-axis table 2 on a bed so as to be movable by a Z-axis as a moving axis (not shown) in the Z-axis direction indicated by an arrow in FIG. An X-axis table 3 that can be moved by an X-axis as a movement axis (not shown) is provided in the X-axis direction indicated by an arrow, and a tool spindle table 4 is provided on the X-axis table 3. A tool spindle 5 that is a rotation axis parallel to the Z axis is provided on the tool spindle table 4 so as to be rotatable.

  A grinding tool 10 for grinding a workpiece is detachably held on the tool spindle 5. The grinding tool 10 has a machining surface 10a composed of a plurality of surfaces on a disc-shaped outer peripheral surface. In the grinding tool 10 of the present embodiment, the processing surface 10a is composed of a concave curved surface 10c and inclined surfaces 10d and 10e, as shown in FIGS. In addition, the shape of the processing surface 10a is not limited to this.

  Further, on the bed of the grinding machine 1, a turning shaft 6 that is an axis orthogonal to the X axis and the Z axis is provided in the front in the Z axis direction. A C-axis table 7 is provided which can move in the C-axis by a C-axis as a moving axis (not shown) indicated by an arrow at the center, that is, can turn in the C-axis direction. A grinding wheel base 8 is provided on the C-axis table 7. The grindstone base 8 is provided with a grindstone rotating shaft 9 which is a rotating shaft orthogonal to the turning shaft 6 so as to be rotatable.

  A shaping grindstone 11 for shaping the grinding tool 10 is detachably held on the grindstone rotating shaft 9. The shaping grindstone 11 has a contact surface 11 a for shaping the processing surface 10 a of the grinding tool 10 on the outer peripheral surface having a disk shape larger in diameter than the grinding tool 10. The contact surface 11 a is formed in a convex curved surface having a smaller curvature than the concave curved surface 10 c of the grinding tool 10. The contact surface 11 a can be opposed to the processing surface 10 a of the grinding tool 10 by moving the X-axis table 3 and the Z-axis table 2 and turning the C-axis table 7.

Next, a method of shaping the grinding tool 10 with the shaping grindstone 11 will be described in the case of shaping the concave curved surface 10c forming one surface of the machining surface 10a.
In the grinding machine 1, the grinding tool 10 is attached to the tool spindle 5 and the shaping grindstone 11 is attached to the grindstone rotating shaft 9. FIG. 2 shows a positional relationship when the concave curved surface 10c of the grinding tool 10 and the contact surface 11a of the shaping grindstone 11 face each other at the center of each surface. At this time, as shown in FIG. 3C, the concave curved surface 10c and the contact surface 11a are in contact with each other at the midpoint of the curved portion having a cross-sectional shape. Here, a contact point where the concave curved surface 10c contacts the contact surface 11a is 10b, and a contact point where the contact surface 11a contacts the processed surface 10a is 11b.

  If the contact surface 11a is simply moved along the concave curved surface 10c, the contact point 11b on the contact surface 11a becomes substantially the same position, and only the portion of the contact point 11b of the shaping grindstone 11 in contact with the concave curved surface 10c is worn. Will end up. Therefore, in the present invention, as shown in order in FIGS. 3 and 4 (A) to (E), in the turning movement of the shaping grindstone 11 in the C-axis direction, the grinding tool 10 is moved in the X-axis and Z-axis directions. The movement is synchronized, and the contact surface 11a is swung relative to the concave curved surface 10c. Note that the positional relationships (A) to (E) in FIGS. 3 and 4 are the same. Moreover, the locus | trajectory between each of (A)-(E) of FIG. 3, FIG. 4 is abbreviate | omitted.

  In FIG. 4, the grinding tool 10 is moved in the X-axis direction and the Z-axis direction, the shaping grindstone 11 is turned around the C-axis, the grinding tool 10 and the shaping grindstone 11 are brought into contact with each other, and the concave curved surface 10c is moved by the contact surface 11a. The locus when moved from (A) to (E) while shaping is shown by a two-dot chain line and a solid line.

3 and 4, the position (A) is a position where the grinding tool 10 and the shaping grindstone 11 start to move, and the position (B) is a position where the concave curved surface 10c of the grinding tool 10 and the contact surface 11a of the shaping grindstone 11 are located. Each position is a start position where contact is started, the position (D) is an end position where the concave curved surface 10c of the cutting tool 10 and the contact surface 11a of the shaping grindstone 11 end contact, and the position (E) is the grinding tool 10. And it is set as the position where the shaping grindstone 11 complete | finishes a movement. First, the grinding tool 10 is moved in the X-axis direction and the Z-axis direction, and the shaping grindstone 11 is turned around the C-axis, so that the concave curved surface 10c of the grinding tool 10 and the contact surface 11a of the shaping grindstone 11 at the start position (B). And contact. At this time, the contact point 10b where the concave curved surface 10c contacts the contact surface 11a and the contact point 11b where the contact surface 11a contacts the concave curved surface 10c are the right end of the concave curved surface 10c as shown in FIG. And on the left side of the contact surface 11a which is a convex curved surface. The grinding tool 10 is moved from (A) to (E) as shown in FIG. 4 so that the shaping tool 11 relatively swings along the concave curved surface 10c. Further, in synchronization with the movement of the grinding tool 10, the shaping tool 11 is turned counterclockwise as shown in FIG. 4 and moved from (A) to (E). Then, the contact point 10b on the concave curved surface 10c is recessed from the start position of (B), which starts contact with the contact surface 11a, to the end position of (D) where the contact ends after passing through the position (C) of the intermediate point. The curved surface 10c is shifted in order from the right end to the left end. At the same time, the contact point 11b on the contact surface 11a passes through the position (C) of the intermediate point from the start position of (B) where the contact point 11b on the contact surface 11a starts to contact the concave curved surface 10c, and the contact ends (D). The contact surface 11a is sequentially shifted from the left side to the right side until the end position. Thus, as the shaping tool 11 turns around the C-axis, the contact point 11b where the contact surface 11a comes into contact with the concave curved surface 10c is shown on the contact surface 11a in (B) to (D) as shown in FIG. The contact surface 11a of the shaping grindstone 11 is relatively swung along the concave curved surface 10c of the grinding tool 10 while shifting from left to right. That is, substantially the entire arc of the contact surface 11a which is a convex curved surface can be brought into contact with the concave curved surface 10c.
If the position (E) is the position where the movement of both is started, the position (A) is the position where the movement ends, and the above-described operation is reversed. Note that the movement may be started from either.

  3 and FIG. 4, when both are moved from the position (A) to the position (E), the next is moved from the position (E) to the position (A). The relative wobble of the shaping grindstone 11 can be performed a predetermined number of times. Here, the contact surface 11a of the shaping grindstone 11 relatively swings, and the contact with both ends of the concave curved surface 10c of the grinding tool 10 is finished. After passing the end positions (B) and (D), the swing is finished. The positions of (A) and (E) to be used are the swing ends. By repeatedly swinging the contact surface 11a of the shaping grindstone 11 a predetermined number of times while sequentially giving a predetermined amount of cut to the concave curved surface 10c of the grinding tool 10 at both swing ends, Shaping is performed by bringing the contact surface 11a into contact with the concave curved surface 10c.

  Similarly to the concave curved surface 10c, the inclined surfaces 10d and 10e are shaped by the above-described method to shape the processing surface 10a of the grinding tool 10.

  In this way, the surface that forms the processing surface 10a of the grinding tool 10 and the contact surface 11a of the shaping grindstone 11 are brought into contact, and the contact surface 11a is changed to the surface that forms the processing surface 10a while shifting the respective contact points 10b and 11b. The workpiece is relatively swung along the surface, and a predetermined amount of cut is sequentially given to the surface forming the processing surface 10a at the swing end, and the swing is repeated a predetermined number of times. By performing these operations on the surfaces 10c, 10d, and 10e forming the processing surface 10a, the grinding tool 10 having the processing surface 10a including the plurality of surfaces 10c, 10d, and 10e on the outer peripheral surface can be shaped. High shape accuracy of the surface 10a can be ensured. Moreover, since the contact surface 11a which is the convex curved surface of the shaping grindstone 11 is brought into contact with the processing surface 10a of the grinding tool 10 evenly, the contact surface 11a is worn almost evenly, and the life of the shaping grindstone 11 is suppressed as much as possible. Can be long.

  Moreover, since the diameter to the contact surface 11a of the outer periphery of the shaping grindstone 11 is larger than the grinding tool 10, if the hardness of the grinding tool 10 and the shaping grindstone 11 is made substantially the same, both will be axially rotated by the same rotation speed, respectively. By doing so, the shaping grindstone 11 having a large diameter has a peripheral speed faster on the outer peripheral surface than the grinding tool 10, and the hardness becomes relatively hard due to the peripheral speed difference. And if the shaping grindstone 11 is axially rotated at a higher rotational speed than the grinding tool 10, the peripheral speed difference is further increased, so that the hardness becomes relatively harder. Therefore, even if the grinding tool and the shaping stone have almost the same hardness, the wear of the shaping wheel can be suppressed as much as possible by making the hardness of the shaping wheel relatively hard due to the peripheral speed difference at the contact point between them. Long life can be achieved. Of course, the diameter of the shaping grindstone 11 may not be made larger than the diameter of the grinding tool 10, and the shaping grindstone 11 may be rotated at a higher rotational speed than the grinding tool.

DESCRIPTION OF SYMBOLS 1 Grinding machine 5 Tool spindle 6 Rotating axis 9 Grinding wheel rotation axis 10 Grinding tool 10a Processing surface 10b Contact point 10c Concave curved surface (surface forming processing surface)
10d Inclined surface (surface forming the processed surface)
10e Inclined surface (surface forming the machining surface)
11 Shaping stone 11a Contact surface (convex curved surface)
11b Contact point

Claims (2)

At least the X axis, the Z axis orthogonal to the X axis, the respective movement axes in the three directions of the C axis that revolves with the axis orthogonal to the Z axis as the revolving axis, the tool spindle that is a rotation axis parallel to the Z axis, and C Grinding machine having a rotation axis orthogonal to the rotation axis of the axis and a grindstone rotation axis that can be swung in the C-axis direction and capable of relatively moving the tool spindle or the grindstone rotation axis in the X-axis and Z-axis directions In the shaping method of the grinding tool performed in the above, the grinding tool having a processing surface consisting of a plurality of surfaces on the outer peripheral surface, and the shaping tool performed by bringing the shaping grindstone having the outer peripheral surface into a convex curved surface into contact with the grinding tool.
The grinding tool is attached to the tool spindle, the shaping grindstone is attached to the grindstone rotation axis, and the movement of the X axis and the Z axis is synchronized with the movement of the C axis perpendicular to the X axis and the Z axis. The convex curved surface is oscillated relatively to each of the surfaces forming the processing surface, and substantially the entire arc of the convex curved surface is brought into contact with the surface forming the processing surface, and the shaping grindstone is formed on each surface forming the processing surface. The position where the convex curved surface passes through both ends of the surface forming the machining surface is defined as the rocking end, and a predetermined amount of cut is sequentially given to the surface forming the machining surface at both rocking ends. A method of shaping a grinding tool characterized by   The grinding tool and the shaping grindstone have substantially the same hardness, and the number of rotations of the tool spindle and the grindstone rotation axis are controlled to shape the contact point between the processing surface of the grinding tool and the convex curved surface of the shaping grindstone. 2. The grinding tool shaping method according to claim 1, wherein the peripheral speed of the grindstone is higher than the peripheral speed of the grinding tool.

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