JP2007237378A - Truing apparatus including, truing method, truing grinding wheel for use in it, and grooving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a truing apparatus, simply controlling the relative speed of the peripheral speed of the grinding stone and a truing grinding wheel, and efficiently truing a grinding stone where a grinding part is formed to have an angled section, a truing method, a truing grinding wheel for use in the above and a grooving apparatus. <P>SOLUTION: This truing apparatus 9 comes into rotary contact with the disk-like grinding stone 31 where a grinding part as a cutting blade is formed to have an angled section to perform truing. The apparatus includes: the disk-like truing grinding wheel 51 where a truing part as a cutting blade is formed on an inclined peripheral surface corresponding to a slant of the grinding part; a rotating mechanism 52 for rotating the truing grinding wheel 51 around a rotating shaft of the grinding stone 31; and a reciprocating mechanism 56 for relatively reciprocating the truing grinding wheel 51 to the grinding stone 31 in the slant direction of the grinding part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a truing apparatus, a truing method for truing a grinding wheel using a truing grindstone, and a truing grindstone and a grooving apparatus used for these.

2. Description of the Related Art Conventionally, as this type of truing device, one having a cup-type (crown-type) truing grindstone is known. In this cup-type truing wheel, the rotation axis of the grinding wheel and the rotation axis of the truing wheel are perpendicular to each other, and the grinding part of the grinding wheel having a rectangular cross section is in contact with the peripheral upper surface of the truing wheel. Truing is performed. In this case, it is possible to increase the amount of free abrasive grains remaining on the contact surface and perform efficient truing by adjusting the rotational speed of the grinding wheel and the cup-type truing wheel and equalizing the peripheral speed. (See Patent Document 1).
JP-A-8-323618

  By the way, when the truing is performed in a state where the cross section of the grinding portion of the grinding wheel is formed in a chevron shape and the rotation axis of the grinding wheel and the rotation axis of the truing grindstone are orthogonal to each other, in the conventional truing device described above, The grinding wheel is truing toward the center with respect to the peripheral edge. In such a case, as the cumulative truing time increases, the outer diameter of the cup-type truing grindstone wears and the outer dimensions become smaller. For this reason, when the rotation speed is constant, the peripheral speed of the cup-type truing grindstone is slowed down, and the relative speed of the peripheral speed between the grinding grindstone and the truing grindstone is increased. As a result, the amount of loose abrasive particles staying on the contact surface is reduced, making it difficult to perform truing under certain conditions. But if the outer diameter corresponds to wear and the number of revolutions of the cup-type truing grindstone is controlled, such a problem is solved. However, such rotation speed control is assumed to be extremely complicated.

  Therefore, a truing device, a truing method, and the like that can easily control the relative speed of the peripheral speed between the grinding wheel and the truing grindstone, and can efficiently truing the grinding grindstone whose grinding portion is formed in a cross-sectional shape. It is an object of the present invention to provide a truing grindstone and a grooving apparatus used for the above.

  The truing device according to the present invention is a truing device that performs truing by rotating contact with a disk-shaped grinding wheel having a grinding portion that has a chevron-shaped cross section. And a truing operation means for truing the truing grindstone with respect to the grinding grindstone, and the truing operation means for rotating the truing grindstone with the rotation axis of the grinding grindstone. A rotating mechanism that rotates around a parallel rotation, and a reciprocating mechanism that reciprocally moves the truing grindstone relative to the grinding wheel in the direction of the inclined surface of the grinding portion.

  And it is preferable that a rotating mechanism rotates a truing grindstone so that the peripheral speed of the rotating grinding grindstone and the peripheral speed of a truing grindstone may become the same.

  The truing method of the present invention is a disc in which a truing part serving as a cutting edge is formed on an inclined peripheral surface corresponding to a slope of the grinding part, while a grinding part serving as a cutting edge is formed into a mountain-shaped cross section. In a truing method in which a truing grindstone is rotatively contacted to perform truing, the truing grindstone is rotated with respect to the grinding grindstone while rotating the grinding grindstone and the truing grindstone around the mutually parallel rotation axes. Truing by reciprocating relative to the

  And it is preferable to rotate a grinding wheel and a truing wheel so that a mutual peripheral speed may become the same.

  According to this configuration, the truing wheel and the grinding wheel rotate around a parallel rotation, and the truing part and the grinding part reciprocate relatively in the direction of the slope to perform truing, thereby truing in the thickness direction. The parts wear out. As a result, even if the truing grindstone is reduced, the outer diameter does not decrease, so the peripheral speed of the grinding grindstone and the truing grindstone does not change, and free abrasive grains easily stay on the contact surface. Truing can be performed as much as possible.

  In this case, it is preferable that the truing part of the truing grindstone has a pair of inclined peripheral surfaces and is formed in a cross-sectional mountain shape.

  According to this structure, it is easy to make the truing portion face the grinding portion, and it is possible to efficiently true the chevron grinding wheel (the grinding portion) without changing the truing grindstone or the grinding grindstone.

  In this case, it is preferable that the truing operation means further includes an advance / retreat mechanism for moving the truing grindstone relative to the grinding grindstone in the axial direction of the rotation shaft.

  According to this configuration, the inclined circumferential surface of the grinding part can be trued one side at a time by advancing and retracting the truing grindstone.

  The truing grindstone of the present invention is characterized by being used in the above truing apparatus or the above truing method.

  According to this structure, the truing grindstone suitable for the truing of the grinding grindstone in which the grinding part was formed in the cross-sectional mountain shape can be provided.

  The grooving apparatus of the present invention is characterized by mounting the above truing apparatus.

  According to this configuration, it is possible to provide a groove processing apparatus capable of performing groove processing with high accuracy.

  Hereinafter, a truing apparatus, a truing method, a truing grindstone and a grooving apparatus used for these according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall view of a grooving device 1, which includes a bed portion 2 that serves as a machine base, a processing table 3 that extends to the left and right in front of the upper surface of the bed portion 2, and a processing table 3. An XY table 4 interposed between the bed portions 2 and moving the processing table 3 in the X-axis direction and the Y-axis direction, a column 5 erected on the back of the upper surface of the bed portion 2, and protrudes forward from the column 5. And a Z-axis table 7 that is provided on the front surface of the column 5 and moves the Z-axis direction in the Z-axis direction. Further, on the processing table 3, an object rotating mechanism 8 on which a processing object roller R is mounted, and a truing unit 9 that is located on the left side of the object rotating mechanism 8 and performs truing on the grinding wheel 31 of the grinding unit 6. The dummy workpiece 10 which is positioned on the right side of the object rotating mechanism 8 and is grooved by the grinding wheel 31 after truing, and the cross-section of the verification groove formed on the dummy workpiece 10 is positioned outside the dummy workpiece 10. Image recognition means 11 for recognizing the shape is mounted. Further, the groove processing device 1 is provided with a control device 12 for NC control of these constituent devices.

  The Z-axis table 7 projects from the front surface of the column 5 and supports a pair of parallel Z-axis guide rails 21 and 21 and the grinding unit 6 and is guided by the Z-axis guide rail 21 and moves in the Z-axis direction. A motor-driven Z-axis slider 22 configured freely. Based on the control of the control device 12, the Z-axis table 7 raises and lowers the grinding unit 6 to the vicinity of the processing target roller R at a high speed, and lowers the grinding unit 6 at a low speed from the vicinity of the processing target roller R to finely adjust the cutting amount. It can be configured.

  The grinding unit 6 includes a grinding wheel rotating mechanism 32 supported by the Z-axis table 7, and a grinding wheel 31 attached to the tip of the grinding wheel rotating mechanism 32. The grinding wheel rotating mechanism 32 is configured by incorporating a grinding wheel motor and a speed reducer inside the casing 33 (both are not shown), and the grinding wheel 31 is detachably attached to the tip of a grinding wheel rotating shaft 34 extending from the speed reducer. ing.

  The grinding wheel 31 is composed of a diamond wheel in which diamond abrasive grains are hardened with a binder such as metal bond or resin bond, and is formed into a disk shape. The grinding portion located at the outer peripheral edge of the grinding wheel 31 has a mountain shape in cross section, and a V-shaped groove can be formed on the surface of the processing target roller R.

  The XY table 4 includes an X-axis table 42 fixed on the upper surface of the bed 2 and a Y-axis table 41 placed on the X-axis table 42, and the machining table 3 is mounted on the Y-axis table 41. . The X-axis table 42 includes a pair of X-axis guide rails provided on the bed 2 and a motor-driven X-axis slider 45 that moves in the X-axis direction on the pair of X-axis guide rails. Similarly, the Y-axis table 41 includes a pair of Y-axis guide rails provided on the X-axis slider 45 and a motor-driven Y-axis slider 43 that moves on the pair of Y-axis guide rails in the Y-axis direction. It is configured.

  The X-axis table 42 mainly moves the processing target roller R in the X-axis direction via the processing table 3 so that a plurality of V-shaped grooves formed on the processing target roller R are formed at an equal pitch. The Y-axis table 41 mainly moves the processing table 3 in the Y-axis direction so that the object rotating mechanism 8, the truing unit 9, and the dummy work 10 are appropriately faced to the grinding wheel 31. Therefore, in the groove processing on the processing target roller R, the lifting and lowering of the grinding wheel 31 by the Z-axis table 7 and the retreating of the processing target roller R by the groove pitch of the X-axis table 42 are repeatedly performed. . Further, the control device 12 stores a processing amount for indicating the timing of shifting from the groove processing to the truing operation for each material, and when the target processing amount is reached, the truing unit is connected via the Y-axis table 41. 9 is placed on the grinding wheel 31. In the embodiment, truing is performed when the half of the plurality of V-shaped grooves of the processing target roller R is processed.

  The object rotation mechanism 8 is mounted at the center on the processing table 3 and includes a geared motor 81 and a mounting shaft that extends from the geared motor 81 and supports the processing object roller R in a cantilever manner. For example, an air chuck is provided on the mounting shaft so that the cylindrical processing target roller R can be firmly chucked from the inside. The object rotation mechanism 8 is NC-controlled by the control device 12 and rotates the processing object roller R at a peripheral speed (preset) different from that of the grinding wheel 31 in consideration of the material. The object rotating means 8 may be configured to face the grinding wheel 31 while rotating the processing object roller R other than the geared motor 81.

  The truing unit 9 is mounted on the left side of the processing table 3 in the drawing, and trues the grindstone of the worn grinding wheel 31 to correct the shape of the grinding wheel 31. The truing unit 9 detachably mounts a disc-shaped truing grindstone 51 in which loose abrasive grains are attached to a truing portion serving as a cutting edge, and the truing grindstone 51 that is mounted on the grinding grindstone 31. And a truing operation mechanism to be operated. Further, the truing operation mechanism includes a truing rotating mechanism 52 that rotates the truing grindstone 51 around a rotation axis parallel to the grindstone rotating shaft 34, and a truing portion of the truing grindstone 51 reciprocating in the direction of the slope with respect to the grinding portion of the grinding wheel 31. The reciprocating mechanism 56 is configured to move, and the advancing / retracting mechanism 57 is configured to advance and retract the truing grindstone 51 in the axial direction of the grindstone rotating shaft 34 with respect to the grinding grindstone 31.

  The truing grindstone 51 has a pair of inclined peripheral surfaces whose truing portions correspond to the grinding portions of the grinding grindstone 31 and is formed in a cross-sectional mountain shape. Thereby, it is easy to make the truing part face the grinding part, and the chevron grinding wheel 31 can be efficiently trued without changing the truing wheel or the grinding wheel. The truing portion is coated with loose abrasive grains that are easily released by rubbing with the grinding portion of the grinding wheel 31, and grinding is performed by performing a lapping-like operation with the grinding portion of the grinding wheel 31. Shape the part into a desired shape (shape correction).

  The truing rotation mechanism 52 rotates the truing grindstone 51 at the same peripheral speed as that of the grinding grindstone 31 during the truing operation, and a truing motor 53 serving as a driving source of the truing grindstone 51 and a truing rotation shaft that is a main shaft of the truing motor 53. 55. And the truing grindstone 51 is attached to the front-end | tip part of the truing rotating shaft 55 so that attachment or detachment is possible. The truing grindstone 51 and the grindstone rotating shaft 34 are installed so as to be parallel to each other, and the truing grindstone 51 is rotated around the rotation axis parallel to the grinding grindstone 31, and the truing grindstone 51 is worn. Also, the outer diameter of the truing grindstone 51 is not changed. Thereby, since the state where the peripheral speeds of the truing grindstone 51 and the grinding grindstone 31 are equal can be easily controlled, an optimal truing operation can be easily obtained (see FIG. 2).

  The reciprocating mechanism 56 presses loose abrasive grains released from the truing grindstone 51 against the grinding grindstone 31, and performs a lapping-like operation along the slant direction of the grinding part with the rotation of both grindstones 51 and 31. is there. By this lapping-like operation, the grinding wheel 31 is appropriately ground and the shape is corrected. For this reason, although not shown in the drawing, the reciprocating mechanism 56 includes a motor serving as a power source and a link mechanism that moves the truing grindstone 51 along both slopes of the grinding part. In this case, since the link mechanism has a V-shaped moving form with respect to the grinding part, the link mechanism reciprocates in two directions by switching.

  The advancing / retracting mechanism 57 is a so-called Y-axis table, and is mounted with the truing rotation mechanism 52 and the reciprocating mechanism 56 described above, and moves the truing grindstone 51 forward and backward in the Y-axis direction via both the mechanisms 52 and 56. In a series of truing operations, the advancing / retracting mechanism 57 presses one inclined peripheral surface of the truing grindstone 51 against one inclined peripheral surface of the grinding grindstone 31, and then presses the other inclined peripheral surface of the truing grindstone 51 on the grinding grindstone 31. It is controlled to press against the other inclined peripheral surface.

  In addition to the truing unit 9, a dressing unit may be provided. Thereby, clogging can be eliminated.

  Further, in addition to the above-described configuration, a configuration in which the machining liquid oozes out from the peripheral edge of the truing grindstone 51 may be added. For example, a machining liquid storage space is formed inside the truing grindstone 51, and an internal flow path connected to the storage space is formed at the axial center of the truing rotation shaft 55, and the machining liquid is formed from a slip ring wound around the truing rotation shaft 55. To supply. If it does in this way, when the truing grindstone 51 rotates, the processing liquid in the truing grindstone 51 will ooze out from the peripheral part of a truing grindstone by centrifugal force, and it will become easy to retain free abrasive grains in a contact part. Therefore, truing can be performed more efficiently.

  The dummy workpiece 10 is formed in a plate shape with carbon, and is positioned and fixed on the right side in the figure on the processing table 3 in a standing posture orthogonal to the grinding wheel 31. The upper end portion of the dummy workpiece 10 is a processing portion, and the grinding wheel 31 facing the dummy workpiece 10 by the Y-axis table 41 forms a V-shaped groove for verification in the thickness direction with respect to the processing portion. That is, the grinding wheel 31 moves so as to cross the processed portion of the dummy workpiece 10 in parallel with the upper end surface thereof, and forms a verification groove similar to the V-shaped groove formed in the processing target roller R.

  Since the dummy workpiece 10 is formed in a plate shape, the image recognition means 11 can take an image without causing problems of focusing and halation, and the grinding wheel 31 is ground through the cross-sectional shape of the verification groove. The cross-sectional shape of the part can be accurately grasped. Moreover, since it formed in plate shape, while being able to process a groove | channel in a short time, the occupation space of the dummy workpiece | work 10 can be made small. Further, since the dummy workpiece 10 is made of carbon, even if the dummy workpiece 10 is grooved, cracks and deformation are hardly generated in the processed portion, and the cross-sectional shape of the grinding wheel 31 is accurately reproduced. Thereby, the cross-sectional shape of the grinding wheel 31 after truing can be grasped with high accuracy. Furthermore, since the contrast between the black dummy workpiece 10 and the verification groove formed on the black dummy workpiece 10 is good, accurate image recognition is possible.

  The image recognition means 11 recognizes an image of the verification groove formed in the dummy workpiece 10 using the CCD camera 61 attached to the position facing the dummy workpiece 10 on the processing table 3, and the sectional shape of the grinding part of the grinding wheel 31. To figure out. Specifically, the end face (cross-sectional shape) of the verification groove processed into the dummy workpiece 10 is imaged, and the imaging result is subjected to image processing to recognize the shape of the verification groove and the size of each part. The control device 12 stores a reference value and an allowable value in advance with respect to the size of each part of the verification groove, and the recognition result is compared with the reference value. In some cases, the display 71 provided outside the apparatus is configured to display that the grinding wheel 31 faces the truing unit 9. That is, the truing operation is repeated until the verification groove (cross-sectional shape of the grinding portion) has a desired shape.

  Here, a series of operations for processing a plurality of V-shaped grooves on the processing target roller R formed by the groove processing apparatus 1 will be described. The grooving method by the grooving apparatus 1 includes a grooving process for grooving the processing target roller R by the grinding wheel 31, a truing process for periodically truing the grinding wheel 31, and a plate-like process after the truing process. A dummy machining step for performing groove machining on the dummy workpiece 10 so as to cross the upper end portion by the grinding wheel 31 and an image recognition step for recognizing an image of the cross-sectional shape of the verification groove formed on the machining surface after the dummy machining step. And consist of

  In the grooving step, the processing target roller R is mounted on the target rotating mechanism 8 and the dummy workpiece 10 is fixed to the processing table 3, and then the processing target roller R is exposed directly below the grinding wheel 31 by the XY table 4. The grinding unit 6 waiting in the raised position is gradually lowered and rubbed against the processing target roller R. At this time, a V-shaped groove having a desired shape is formed by grinding the abrasive grains of the grinding wheel 31 while rubbing the peripheral surface of the processing target roller R. Thereafter, the grinding unit 6 is raised (in this case, the grinding wheel 31 is slightly separated from the circumferential surface of the processing target roller R), and the processing table 3 is moved in the X-axis direction by the groove pitch, and then again ground. The unit 6 faces the processing target roller R. By repeating the above operation, a plurality of V-shaped grooves are processed in parallel on the surface of the processing target roller R with equal gaps therebetween.

  In the truing process, when a predetermined processing amount is reached in the grooving process, a truing command is issued from the control device 12, the Y-axis table 41 is driven, and the truing unit 9 is brought directly under the grinding wheel 31 to grind the grinding wheel. The above truing operation for correcting the cross-sectional shape of the 31 grinding portion is performed.

  In the dummy machining process, a verification command is issued from the control device 12 after the truing process is completed, the Y-axis table 41 is driven, the dummy workpiece 10 faces the grinding wheel 31, and a V-shaped verification groove is formed in the machining portion of the dummy workpiece 10. Is processed.

  In the image recognition process, the cross-sectional shape of the verification groove formed in the dummy workpiece 10 after the dummy machining process is image-recognized by the CCD camera 61, the size of the verification groove is measured, and compared with the reference value. At this time, when it is outside the range of the reference value ± allowable value, it faces the truing unit 9, and when it is within the range of the reference value ± allowable value, it faces the processing target roller R and the remaining V-shape. Grooves are formed.

  As described above, according to the present invention, it is possible to easily control the relative speed of the peripheral speed between the grinding wheel and the truing wheel, and to efficiently truing the grinding wheel in which the grinding portion is formed in a cross-sectional shape. Can do.

It is a whole figure perspective view of a groove processing apparatus. It is explanatory drawing of the truing of a grinding wheel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Groove processing apparatus 9 ... Truing unit (truing apparatus) 31 ... Grinding wheel 51 ... Truing wheel 52 ... Truing rotation mechanism (rotation mechanism) 56 ... Reciprocation mechanism 57 ... Advance / retreat mechanism

Claims (8)

In a truing device that performs truing by rotating contact with a disk-shaped grinding wheel in which a grinding part to be a cutting edge is formed in a mountain shape in cross section,
A truing grindstone in the form of a disk, on which a truing part that becomes a cutting blade is formed on an inclined peripheral surface corresponding to the slope of the grinding part,
Truing operation means for truing the truing grindstone with respect to the grinding grindstone, and
The truing operation means includes a rotation mechanism that rotates the truing grindstone around a rotation axis parallel to the rotation axis of the grinding grindstone, and the truing grindstone is reciprocally moved relative to the grinding grindstone in the slope direction of the grinding portion. And a reciprocating mechanism for moving the truing device.   2. The truing apparatus according to claim 1, wherein the rotating mechanism rotates the truing grindstone so that a peripheral speed of the rotating grinding grindstone is equal to a peripheral speed of the truing grindstone.   The truing device according to claim 1 or 2, wherein the truing portion of the truing grindstone has a pair of inclined peripheral surfaces and is formed in a cross-sectional mountain shape.   4. The truing apparatus according to claim 3, wherein the truing operation means further includes an advancing / retreating mechanism for advancing / retreating the truing grindstone relative to the grinding grindstone in an axial direction of the rotation shaft. . A disc-shaped truing grindstone in which a truing portion serving as a cutting edge is formed on an inclined peripheral surface corresponding to a slope of the grinding portion, with respect to a disc-shaped grinding grindstone in which a grinding portion serving as a cutting blade is formed in a cross-sectional mountain shape, In the truing method of performing truing by rotating contact,
Truing by rotating the truing grindstone relative to the grinding wheel relative to the slanting direction of the grinding part while rotating the grinding grindstone and the truing grindstone around rotation axes parallel to each other. Characteristic truing method.   6. The truing method according to claim 5, wherein the grinding wheel and the truing wheel are rotated so that their peripheral speeds are the same.   A truing grindstone used for the truing device according to any one of claims 1 to 4 or the truing method according to claim 5 or 6.   A grooving apparatus comprising the truing device according to any one of claims 1 to 4.

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