JP4923769B2 - Grinding machine and grinding system - Google Patents

Description

  The present invention relates to a grinding apparatus that grinds the inner and outer peripheral surfaces of an endless metal belt, and a grinding system that includes an end face grinding apparatus that grinds the end face of an endless metal belt in addition to the grinding apparatus, and in particular, grinding. The present invention relates to a grinding apparatus and a grinding system capable of effectively removing grinding dust adhering to the inner and outer peripheral surfaces of a metal belt in a process.

  A metal CVT belt for high load transmission used in a belt type continuously variable transmission (hereinafter referred to as CVT) is formed by laminating an annular belt to form a belt laminated body, and this belt laminated body is used as a belt width. The belts are arranged so as to be lined up in the direction, and each belt laminate is locked and fixed by a plurality of blocks (elements). For example, as shown in FIG. 31a, an annular belt a, a,... Is laminated to form a laminate b, and the laminate b, b is fitted into a plurality of blocks c, c,. Is formed. This annular belt a forms a thin cylindrical metal drum by welding the end portions of the plate-like metal, and heats the entire metal drum (contains) the welded portion and the base material. After blending, for example, the outer roll cutter and the inner roll cutter disposed in the cylinder are brought into contact with each other and sheared. The cut annular belt is barrel-polished in the final step. Barrel polishing is the removal of burrs and rounding of corners by putting the object to be polished (work) and abrasive (media) into the barrel (container), and by the relative friction between the work and the media caused by the movement of the barrel. It is a polishing method for performing surface processing such as.

  By the way, at the time of cutting with a roll cutter, burrs a1 (protrusions pulled outward) and sagging (indents that can be dragged inward in the width direction of the belt) as shown in FIG. In order to remove such burrs and sagging, the barrel polishing described above is performed. Further, since the oxide film a2 having a thickness of about 1 μm formed on the belt surface during the formation of the belt hinders nitriding of the belt surface, the oxide film can also be removed by barrel polishing. Furthermore, the corner portion of the belt end surface can be formed into a smooth curved shape by barrel polishing (R attaching process).

  As mentioned above, during the conventional CVT belt molding, barrel polishing is performed for the purpose of removing the oxide film and removing burrs and sagging, but this barrel polishing cannot completely remove the burrs and sagging. However, since it takes about one hour to remove the oxide film formed on the belt surface, the production efficiency of the belt is reduced. Furthermore, since a large amount of media becomes waste material in barrel polishing, the disposal of such waste material has also been a big problem. Therefore, Patent Document 1 discloses a technique related to a processing method for grinding an end face of a belt without performing such a barrel polishing process. Further, Patent Literature 2 discloses a technology related to an endless metal ring manufacturing apparatus that is a result of earnest research by the present applicant and that polishes not only the end surface of the CVT belt but also the inner and outer peripheral surfaces thereof. Has been.

JP 2004-261882 A JP 2005-155755 A

  According to the endless metal ring manufacturing apparatus disclosed in Patent Document 2, not only the end surface of the belt but also the inner and outer peripheral surfaces thereof are polished, so that the processing time can be shortened and polished as compared with the conventional barrel polishing apparatus. It becomes possible to improve the processing accuracy. However, such a manufacturing apparatus has not yet come up with a technical idea relating to removal of grinding dust (chips, abrasive grains, etc.) generated in the polishing process and attached to the inner and outer peripheral surfaces of the ring. According to the present inventors, if the grinding dust generated / adhered in the polishing process is not removed from the inner and outer peripheral surfaces of the belt, the grinding dust is removed when the belt passes through the rotating roller, backup roller, etc. constituting the apparatus. A problem has been identified that can be trapped in the belt. The damage caused by the grinding dust is a starting point, and in some cases, the ring can be cut, which can lead to a big problem regarding product performance / product durability.

  The present invention has been made in view of the above-described problems, and when grinding the inner and outer peripheral surfaces of an endless metal belt such as a CVT belt, grinding dust attached to the inner and outer peripheral surfaces is reliably removed. It is an object of the present invention to provide a grinding apparatus and a grinding system capable of performing grinding while carrying out grinding.

  In order to achieve the above object, a grinding apparatus according to the present invention is a grinding apparatus that grinds the inner and outer peripheral surfaces of an endless metal belt, wherein the grinding apparatus spans and rotates the metal belt. A first grinding roller for grinding the inner peripheral surface of the metal belt between the driven roller, the two rollers, and a part of the inner peripheral surface below the metal belt; and the first grinding roller And a backup roller disposed at a position for sandwiching the metal belt, and a second grinding for grinding an outer peripheral surface of the metal belt disposed at a position for sandwiching the metal belt with either the driving roller or the driven roller. A roller and an upstream side where the metal belt rotates and enters between the first grinding roller and the backup roller, and coolant is provided to the outer peripheral surface of the lower surface of the metal belt. At least a first coolant supply unit, and a second coolant supply unit and a third coolant supply unit that supply coolant to each of the first grinding roller and the second grinding roller. Features.

  The grinding apparatus of the present invention is an apparatus for grinding (polishing) the inner and outer peripheral surfaces of any endless metal belt including the CVT belt described above. This grinding device grinds the inner and outer peripheral surfaces of a metal belt at once with a single device, and the grinding part of the metal belt has an inner circumference when it is necessary to manage the grinding amount with high accuracy. It is preferable that the grinding part of the surface is different from the grinding part of the outer peripheral surface.

  An endless metal belt is stretched between two rotating rollers of a driving roller and a driven roller constituting the grinding apparatus, and the endless metal belt is rotated around the two rotating rollers by rotationally driving the driving roller. In addition, one of the driven roller and the drive roller is configured to be separable from the other, so that after the metal belt is passed over, the one roller is separated from the other, and a certain tension is applied to the metal belt. Can be granted.

  A first grinding roller for grinding the inner peripheral surface of the metal belt is in contact with a part of the inner peripheral surface of the lower surface of the endless metal belt that is stretched between the driving roller and the driven roller. This grinding roller can freely enter and exit the endless metal belt by an appropriate actuator. A backup roller is disposed at a position facing the first grinding roller, and an endless metal belt can pass between the grinding roller and the backup roller. The first grinding roller enters the endless metal belt, and then is fed to the backup roller side so as to sandwich the endless metal belt interposed between the backup roller and the backup roller as a reaction force frame. The inner peripheral surface can be ground. In the grinding process, it is possible to perform the grinding process while managing the grinding amount with high accuracy by a constant pressure control system based on pressure feedback control.

  On the other hand, a second grinding roller for grinding the outer peripheral surface of the endless metal belt is disposed at a position facing either the driving roller or the driven roller. The grinding roller is connected to the driving roller and the driven roller. After the metal belt is stretched between the rollers, the metal belt is sandwiched by moving to one of the rollers. When grinding the outer peripheral surface of the metal belt, the second grinding roller can grind the outer peripheral surface of the metal belt using the driving roller or the driven roller as a reaction force frame. When grinding the outer peripheral surface of the metal belt, a predetermined amount of grinding can be performed while applying pressure to the metal belt by a constant pressure control system using pressure feedback control.

  In the grinding apparatus of the present invention, a coolant supply unit (first coolant supply unit) is disposed on the upstream side where the metal belt rotates and enters between the first grinding roller and the backup roller. The coolant can be supplied to the outer peripheral surface of the lower surface. This coolant supply unit is a mechanism for removing grinding dust such as chips and abrasives generated during grinding of the outer peripheral surface of the metal belt. The grinding dust attached to the outer peripheral surface of the metal belt And being removed before being pushed into the metal belt, it is possible to prevent the metal belt from being damaged due to the embedded grinding dust. Further, by providing the coolant on the outer peripheral surface of the lower surface of the endless metal belt, there is an effect that grinding dust adhering to the outer peripheral surface of the metal belt can be efficiently removed. This is because the grinding dust adhering to the surface of the metal belt is easily dropped by its own weight by spraying the coolant onto the lower surface of the metal belt. In addition, it is possible to reduce the coolant supply pressure (pressure necessary for blowing off dust) as much as possible, compared to the case where the grinding dust on the outer peripheral surface such as the upper surface of the metal belt is blown off.

  In addition, there are further provided coolant supply parts (second and third coolant supply parts) for removing grinding dust adhering to the surfaces of the first and second grinding rollers and cooling the grinding rollers. It has been. Moreover, the structure provided with the separate coolant supply part for removing the grinding dust etc. which adhered to the internal peripheral surface of the metal belt may be sufficient.

  According to the grinding apparatus of the present invention, it is possible to reliably prevent grinding dust generated during grinding and adhering to the surface of the metal belt from being sandwiched between appropriate rollers and embedded inside the metal belt. Furthermore, it is possible to manufacture a high-quality endless metal belt by removing the grinding dust from the grinding roller.

  Further, in a preferred embodiment of the grinding apparatus according to the present invention, in the grinding apparatus, a direction inclined by a predetermined angle from a vertical direction in a direction opposite to a rotation direction of the metal belt with respect to an outer peripheral surface of the lower surface of the metal belt. The first coolant supply unit is adjusted so that the coolant is provided to the first coolant.

  The first coolant supply unit can be composed of, for example, a coolant tank, a pump for supplying coolant from the tank to various places, and a coolant discharge nozzle, and each is connected in communication with a hose or a pipe.

  The coolant is provided on the outer peripheral surface of the lower surface of the endless metal belt. Here, when coolant is supplied from the vertically lower side to the lower surface of the metal belt, the grinding dust is pressed against the surface of the metal belt. Therefore, the efficient removal of the grinding dust is hindered. Therefore, in the present embodiment, the first coolant supply unit (nozzle thereof) is adjusted so as to provide the coolant in a direction opposite to the rotation direction of the metal belt and in a direction inclined by a predetermined angle from the vertical direction. Is.

  The inclination angle of the nozzle described above is determined depending on the diameter of the abrasive grains and the adhesion force (van der Waals force) acting between the abrasive grains and the liquid crosslinking force (the coolant spraying force is greater than the adhesion force). However, according to a trial calculation by the inventors, for example, it is necessary to supply coolant at an inclination angle of about 49 degrees or more.

  In a preferred embodiment of the grinding apparatus according to the present invention, in the grinding apparatus, both the first grinding roller and the second grinding roller rotate in opposite directions with respect to the rotation direction of the metal belt. And the third coolant supply unit is located above or below the second grinding roller and deviated by a predetermined amount from the vertical center of the grinding roller toward the driving roller or the driven roller. And is adjusted so as to supply a coolant in a predetermined inclination angle direction with respect to the rotational axis of the second grinding roller, and the second coolant supply unit is configured to supply the first grinding. Disposed above the roller and at a position deviated by a predetermined amount from the vertical center of the grinding roller in a direction opposite to the rotation direction of the grinding roller, and with respect to the rotational axis of the first grinding roller. Characterized in that it is adjusted to supply a coolant to the predetermined inclination angle direction.

  In the present embodiment, the position and angle of the coolant discharge nozzle constituting the coolant supply unit (second and third coolant supply units) for removing grinding dust from the grinding roller and cooling the roller are adjusted. It is a form. Here, both the first grinding roller and the second grinding roller rotate in opposite directions with respect to the rotation direction of the metal belt in order to efficiently remove grinding dust from the inner and outer peripheral surfaces of the metal belt. It is controlled.

  First, a coolant supply section (third coolant supply section) that supplies coolant to a second grinding roller that grinds the outer peripheral surface of the metal belt is disposed above or below the grinding roller, and It is disposed at a position deviated by a predetermined amount from the vertical center of the grinding roller toward the driving roller or the driven roller. Further, the coolant is adjusted so as to be supplied in a predetermined inclination angle direction with respect to the rotation axis of the second grinding roller. For example, when the apparatus is configured to sandwich a metal belt with the drive roller, the drive roller and the second grinding roller rotate in opposite directions. Here, when the coolant is provided on the upper surface of the grinding roller, the coolant is provided over the entire area (substantially the entire area) of the grinding roller, and grinding dust blown off by the coolant from the surface of the grinding roller is between the two rollers. In order not to fall into the nozzle, the nozzle is set back by a predetermined amount as described above.

  Also, the coolant discharge angle (nozzle angle) is not set in the horizontal direction with respect to the upper surface of the grinding roller, but the nozzle angle is set so that the coolant is discharged from the upper tilt angle direction onto the upper surface of the grinding roller. To be adjusted.

  According to the verification by the inventors, it has been obtained that the setback amount is desirably set back within a range of about 5 to 30 degrees from the upper end (vertical center point) of the grinding roller. Further, the inclination angle (slant angle) of the nozzle is adjusted within a range of about 5 to 15 degrees, and the coolant discharged from the nozzle has a width of about 1/4 of the coolant side in the width direction of the grinding roller. The result is that the coolant can be provided over the entire width of the grinding roller by adjusting the nozzle to be discharged into the region.

  In addition to the nozzle angle and the setback amount, other factors such as the rotation speed of the grinding roller can be considered as elements for effectively providing the coolant to the entire area of the grinding roller. It is fixed at a predetermined rotational speed based on the specified grinding conditions, and therefore it is difficult to arbitrarily change and adjust. Therefore, in the present embodiment, the coolant is effectively provided to the grinding roller by adjusting only the position and posture of the coolant discharge nozzle.

  Further, the grinding system according to the present invention includes a second grinding roller provided with a plurality of second driving rollers and second driven rollers that span the metal belt and rotate, and a plurality of first grinding brushes in the circumferential direction. And a fourth grinding roller in which a plurality of second grinding brushes are provided in the circumferential direction, the first grinding brush and the second grinding brush are provided with a separation that does not interfere, and the second driving roller The third grinding roller and the fourth grinding roller are disposed at a position facing the second driven roller, and the end face of the metal belt is ground by the third grinding roller and the fourth grinding roller. An end surface grinding device and the grinding device for grinding the inner and outer peripheral surfaces of the metal belt, and a plurality of the end surface grinding devices are arranged in a line shape, End grinding Is further provided with a conveying device for transferring the metal belt between the driving roller and the driven roller of each end surface grinding device and the grinding device, and one end surface of the metal belt is appropriately end-grinded. After being ground by the apparatus, the other end face of the metal belt is ground by the next end face grinding apparatus, and the inner and outer peripheral surfaces of the belt are ground by the grinding apparatus.

  The grinding system of the present invention comprises the above-described grinding device that grinds the inner and outer peripheral surfaces of an endless metal belt, and a plurality of end surface grinding devices that grind the end surface of the endless metal belt. . More specifically, a plurality of end surface grinding devices are arranged in a line, and the endless metal belt is sequentially conveyed to the end surface grinding device, whereby both end surfaces of the metal belt are ground. Next, the endless metal belt is conveyed to a grinding device that grinds the inner and outer peripheral surfaces thereof, is ground, and is carried out as a final product.

The end surface grinding apparatus includes a second driving roller and a second driven roller that are wound around an endless metal belt and rotated, a third grinding roller provided with a plurality of first grinding brushes in the circumferential direction, and a second grinding roller. And a fourth grinding roller provided with a plurality of grinding brushes in the circumferential direction. Here, the first and second grinding brushes used are not particularly limited. For example, many nylons in which abrasive grains such as alumina (Al ₂ O ₃ ) and silicon carbide (SiC) are melted are used. A so-called segment brush configured by bundling wires can be used. In this case, one end of the bundle of nylon wires is accommodated in a metal tube, the other end of the bundle of nylon wires is fitted into a separate metal tube, and the other end is slightly protruded from the metal tube. A grinding brush can be formed in a state. The other end is pressed against the belt end surface to grind the end surface, but the vicinity of the other end is constrained by a metal cylinder to ensure the rigidity of the brush and maintain the grinding force by the grinding brush. Is possible. In addition, when the grinding brush end is worn by grinding, the protruding length of the nylon wire protruding from the metal cylinder is adjusted by extruding one end of the bundle accommodated in the metal cylinder from the cylinder. be able to.

  For example, a plurality of the segment brushes described above are attached to the third grinding roller and the fourth grinding roller (attached at intervals in the circumferential direction of the grinding roller), and both are attached to the casing end portion incorporating the motor. The grinding rollers are mounted apart from each other so as not to interfere with each other. Here, the two grinding rollers are both mounted on separate motor drive shafts, and are preferably configured to rotate synchronously.

  Two rollers (a second driving roller and a second driven roller) are provided at the end of the casing in which the motor is built at a position facing the two grinding rollers. After the metal belt is passed over the driving roller and the driven roller, the grinding roller, the driving roller and the driven roller are relatively positioned so that the segment brushes mounted on the two grinding rollers are in contact with the belt end faces. Can be moved close to each other. When the brush is worn due to grinding, for example, the pressure sensor attached to the segment brush is used to detect the degree of wear of the brush, and the other end of the nylon wire in the embodiment described above is worn toward the belt side. It can also be configured to automatically push out by the amount.

  Both end faces of the metal belt are sequentially ground by, for example, two end face grinding apparatuses, and each end face is alternately subjected to rough grinding and finish grinding by, for example, a separate end face grinding apparatus. In this embodiment, at least four end face grinding devices are arranged in a line. As an embodiment of the grinding sequence, rough grinding of one end face of a metal belt is performed, the metal belt is conveyed to the next end face grinding apparatus and rough grinding of the other end face is performed, and the next end face grinding apparatus is used. After being conveyed, finish grinding of one end face is performed, and finally, it is transported to the next end face grinding apparatus and finish grinding of the other end face is performed. In this way, in order to alternately change the grinding end surface of the metal belt, the disposition positions of the second driving roller and the second driven roller on which the metal belt is stretched in the end surface grinding apparatus adjacent to each other with an interval therebetween. And the arrangement | positioning position of a grinding roller should just reverse reverse with respect to a line.

  Also, the transport device is not particularly limited. For example, two rods are provided at an interval, and a belt is deformed into a track shape on each opposing surface of the pair of rods. Two chuck members that are held in a posture are attached, and this set of chuck members is attached to the rod body at the same interval as the four end face grinding devices described above. Forms can be applied. Belts in which one set of rods is ground at each end face grinding device by reciprocating between the pair of end face grinding devices and between the end face grinding device and the grinding device at intervals. Can be conveyed to the next end surface grinding apparatus for grinding the other end surface, and further to the grinding apparatus for grinding the inner and outer peripheral surfaces. Finally, a product conveyor belt conveyor is installed in the front of the grinding machine that grinds the inner and outer peripheral surfaces of the metal belt. For example, an endless metal belt finished through a five-stage grinding process is It is transferred onto this belt conveyor and carried out.

  A more specific embodiment of the above-described endless metal belt being transferred to and transported from a roller is set by a loader while the metal belt is deformed into a track shape between chuck members at the end via, for example, a shooter. One set of rods moves so that the chuck member holding the metal belt comes to the position of the first end face grinding apparatus. The driving roller and the driven roller constituting the end surface grinding apparatus move to the rod side, and the two rollers are inserted into the inner peripheral portion of the track-shaped metal belt. In this posture, for example, the driven roller moves away from the driving roller, and the track-shaped metal belt is tensioned in the longitudinal direction. When the metal belt is tensioned in the longitudinal direction, the metal belt is deformed to be longer than the state held by the chuck member, and the metal belt is released from the chuck member. The drive roller is rotated in a posture in which the metal belt is released from the chuck member. Here, the grinding roller moves so that the grinding brush of the grinding roller contacts the end surface of the metal belt, and the two grinding rollers rotate in the same direction while contacting the end surface of the metal belt with a predetermined pressing force. Let When the predetermined rough grinding is completed, the driven roller moves to the driving roller side, the track-shaped metal belt is chucked by the chuck member, and the driving roller and the driven roller are retracted from the bar member. The metal belt chucked by the chuck member is transported to the next end surface grinding apparatus by the movement of the bar. This end face grinding apparatus also performs rough grinding of the opposite end face of the metal belt by the same operation. Thereafter, finish grinding of both end faces is alternately performed by the same operation, and the inner and outer peripheral surfaces of the metal belt are ground by a grinding apparatus and finally transferred to a belt conveyor. The difference between rough grinding and finish grinding is adjusted by changing the wire diameter of the brush used during grinding or the grain size of the abrasive grains.

  For example, as described above, the conveyance device sequentially conveys one belt to the next end surface grinding device or grinding device, and can also convey separate metal belts in the same manner. With this configuration, it is possible to unattended all of the rough grinding to finish grinding of the belt end face and grinding of the inner and outer peripheral faces, and the entire circumference of the endless metal belt can be ground efficiently and with high accuracy. It becomes.

  As can be understood from the above description, according to the grinding apparatus and the grinding system of the present invention, the grinding dust attached to the surface of the endless metal belt at the time of grinding can be reliably ensured before being embedded in the metal belt by an appropriate roller. Since it can be removed, it is possible to reliably prevent a product defect such that the metal belt is broken by the grinding dust. Further, according to the grinding device and the grinding system of the present invention, it is possible to grind the end face and the inner and outer peripheral faces of the endless metal belt with high accuracy.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing an outline of a grinding apparatus of the present invention, FIG. 2 is a diagram schematically showing a front view of the grinding apparatus, and FIG. 3 is a plan view of the grinding apparatus. Each figure is shown. 4A is a plan view showing that a nozzle for supplying a coolant to a grinding roller for grinding an outer peripheral surface of a metal belt is set back and positioned, and FIG. 4B is an inclined posture of the nozzle shown in FIG. 4A. It is the side view which showed. FIG. 5 is a schematic diagram of the result of verifying the spread of the coolant supplied to the grinding roller according to the position of the nozzle shown in FIG. 4, and FIG. 5a is a schematic diagram in the case of an appropriate setback amount, FIG. 5c is a schematic diagram in the case of an undesirable setback amount. FIG. 6 is a schematic view of the result of verifying the spread of the coolant supplied to the grinding roller according to the inclination angle of the nozzle shown in FIG. 4, and FIG. 6a is a plan view in the case of an undesirable inclination angle (horizontal). 6b is a side view thereof. FIG. 7 is a schematic diagram of the result of verifying the spread of the coolant supplied to the grinding roller according to the inclination angle of the nozzle shown in FIG. 4, FIG. 7a is a plan view in the case of an appropriate inclination angle, and FIG. It is a side view. In the illustrated embodiment, the inner and outer peripheral surfaces and end surfaces of the endless metal belt constituting the CVT belt are to be ground, but it goes without saying that the object to be ground is not limited to such a metal belt.

  FIG. 1 is a perspective view of an embodiment of a grinding apparatus for grinding the inner and outer peripheral surfaces of an endless metal belt. The grinding apparatus 100 is configured such that a driving roller 1 and a driven roller 2 that are wound around an endless metal belt b and rotated, and can enter and exit between the driving roller 1 and the driven roller 2 and can move in a vertical direction. The reaction belt for grinding the inner peripheral surface by the grinding roller 3 by sandwiching the metal belt b between the grinding roller 3 (first grinding roller) and the grinding roller 3 for grinding the inner peripheral surface of the metal belt b. A metal belt b is sandwiched between the backup roller 4 and the driving roller 1 and a grinding roller 5 (second grinding roller) for grinding the outer peripheral surface of the metal belt b, and a coolant supply unit disposed at various places. The nozzles 61a, 62a, 63a, 64a, and 65a are roughly configured.

  The drive roller 1 is controlled to rotate at a predetermined rotational speed by the spindle motor 11 (X1 direction in FIG. 2), and the driven roller 2 rotates synchronously with the drive roller 1 as the metal belt b rotates (see FIG. 2). 2 X1 direction). The driven roller 2 is configured so that it can be separated / closed to the driving roller 1 by a feed screw mechanism 21 having a servo motor, and when the metal belt b is passed over the driving roller 1 and the driven roller 2. The driven roller 2 is separated from the driving roller 1 to form a track-like posture in a posture in which a predetermined tension is applied to the metal belt b (direction X7 in FIG. 3).

  The rotation control of the grinding roller 3 for grinding the inner peripheral surface of the metal belt b is executed and controlled by the spindle motor 31. When the metal belt b is stretched between the driving roller 1 and the driven roller 2, the grinding roller 3 is moved between the driving roller 1 and the driven roller 2 by a feed screw mechanism (not shown) (see FIG. 3). Y1 direction), and further, constant pressure feed to the inner peripheral surface side of the metal belt b based on pressure feedback control is executed by the feed screw mechanism 32 having a servo motor (Z direction in FIG. 2). Note that the rotation direction of the grinding roller 3 is set in the opposite direction (X2 direction in FIG. 2) to the rotation direction of the metal belt b (X5 direction in FIG. 2), and efficient grinding can be realized. .

  When grinding the inner peripheral surface of the metal belt b, the backup roller 4 disposed at a position facing the grinding roller 3 is raised so as to come into contact with the lower surface of the metal belt b by a feed screw mechanism (not shown). As the roller 3 descends, the metal belt b is sandwiched between the rollers 3 and 4. The backup roller 4 is driven to rotate with the rotation of the metal belt b (X4 direction in FIG. 2).

  On the other hand, the rotation of the grinding roller 5 for grinding the outer peripheral surface of the metal belt b is controlled by the spindle motor 51 (X3 direction in FIG. 2), and the reaction force at the time of grinding by the feed screw mechanism 52 that executes constant pressure feeding. It is horizontally moved to the side of the driving roller 1 serving as a gantry (direction X6 in FIG. 2). The rotation direction of the grinding roller 5 is also set in the direction opposite to the rotation direction of the metal belt b as shown in the figure.

  As shown in the figure, the endless metal belt b has its inner and outer peripheral surfaces ground at separate grinding positions, so that it is possible to manage the grinding amount with high precision during precision grinding. It is easy to be done.

  Further, on the upstream side where the metal belt b rotates and enters between the grinding roller 3 and the backup roller 4, a nozzle 61a for supplying coolant to the outer peripheral surface below the metal belt b is directed in a predetermined angular direction. The nozzle 61a communicates with a coolant tank (not shown) and a liquid feed pump via a flow path 61b made of a hose or a pipe. Details of the inclination angle of the nozzle 61a will be described later.

  A nozzle 62a that removes grinding dust from the grinding surface of the grinding roller 5 that grinds the outer peripheral surface of the metal belt b and supplies coolant for cooling the grinding surface is located above the grinding surface. At the same time, the grinding roller 5 is set back to the driving roller 1 side by a predetermined amount from the vertical center, and is positioned in a posture inclined by a predetermined angle. This nozzle 62a also communicates with a coolant tank (not shown) and a liquid feed pump via an appropriate flow path 62b.

  Further, a nozzle 63a for supplying coolant to the grinding surface of the grinding roller 3 for grinding the inner peripheral surface of the metal belt b is provided by the same positioning method as the nozzle 62a. The nozzle 63a also communicates with a coolant tank (not shown) and a liquid feed pump via the flow path 63b.

  Further, a coolant supply nozzle 64a and a flow path 64b, and a nozzle 65a and a flow path 65b for removing grinding dust from the inner peripheral surface of the metal belt b are also provided.

  As shown in FIG. 2, before the metal belt b enters between the grinding roller 3 and the backup roller 4, the grinding dust S adhering to the outer peripheral surface of the metal belt b is blown off by the coolant K supplied from the nozzle 61a. Thus, it is possible to prevent the grinding dust S adhering when the metal belt b is sandwiched between the rollers 3 and 4 from biting into the metal belt b. In particular, since the nozzle 61a removes adhering dust on the lower outer peripheral surface of the metal belt b, the adhering force of the dust is reduced by its own weight, so the discharge force of the coolant K can be reduced. It becomes. Further, on the inner peripheral surface of the metal belt b, grinding dust attached to the inner peripheral surface is blown away by the coolant K supplied from the nozzle 65a.

  Further, the grinding debris S and S adhering to the outer peripheral surfaces of the grinding rollers 3 and 5 are blown away by the coolant K supplied from the nozzles 62a and 63a, and each grinding roller is cooled by the coolant K, thereby grinding. It is possible to effectively eliminate processing defects due to heat generation.

  Next, the nozzle position (setback amount) and the nozzle inclination angle when the nozzle 62a is positioned above the grinding roller 5 will be described with reference to FIGS.

  FIG. 4 a is a diagram showing the positional relationship between the nozzle 62 a and the grinding roller 5 in plan view. Here, the center line of the nozzle 62a is disposed at a position set back by a predetermined length L1 from the rotation center line P of the grinding roller 5 to the drive roller 1 side. On the other hand, FIG. 4B is a diagram showing the positional relationship between the nozzle 62a and the grinding roller 5 in a side view. In addition to the setback of a predetermined length shown in FIG. 4a, the nozzle 62a is inclined by a predetermined angle: θ so that the coolant spreads over the entire upper surface of the grinding roller 5. Note that the tip of the nozzle 62a is disposed at a position slightly higher than the upper end of the grinding roller 5 (for example, about 1 to 2 mm) and similarly spaced from the end of the grinding roller 5 by about 1 to 2 mm. . When the coolant is discharged from the nozzle 62a under these conditions, the inventors have specified that the coolant K is discharged within a range of 1/3 to 1/4 of the entire width of the grinding roller 5: L2. By adjusting the posture, the coolant K can be effectively discharged over the entire width of the grinding roller 5.

[Verification result on nozzle setback]
FIG. 5 is a diagram schematically showing a verification result by the inventors regarding the optimum setback amount of the nozzle 62a. Here, FIG. 5a shows that the setback amount of the grinding roller 5 is set under the condition that the nozzle 62a has a constant inclination angle and the grinding roller 5 is rotated counterclockwise (X3 direction) at a constant rotational speed. The state of the expansion of the coolant K when the angle is 5 to 30 degrees from the zenith portion: δ1 (setback amount: L1) is shown. According to this condition, the coolant K can be provided over the entire top end of the grinding roller 5, and the grinding dust S,... Can be effectively blown away without falling to the drive roller 1 side.

  On the other hand, FIG. 5b shows the result when there is no setback amount, and FIG. 5c shows the result when the setback amount δ2 is 45 degrees. In the case where there is no setback amount shown in FIG. 5b, the coolant is not spread over a range of approximately half on the drive roller 1 side due to the rotation of the grinding roller 5. Therefore, grinding scraps adhering to such a range fall to the drive roller 1 side.

  Further, as shown in FIG. 5c, when the setback amount is about 45 degrees, the coolant K does not spread over the half of the grinding roller 5 on the side opposite to the drive roller 1 side, contrary to FIG. 5b.

  From the above verification results, the inventors say that the optimal setting range is to set the setback amount of the nozzle 62a to about 5 to 30 degrees toward the drive roller in the case of the rotation direction of the grinding roller shown in the figure. I came to a conclusion.

[Verification results on nozzle tilt angle]
Next, verification results by the inventors regarding the inclination angle of the nozzle 62a will be described with reference to FIGS. 6A and 6B are schematic views showing the spread of the coolant K when there is no inclination angle (horizontal), FIG. 6a shows a plan view, and FIG. 6b shows a side view. On the other hand, FIG. 7 is a schematic view showing the spread of the coolant K when the inclination angle is set in the range of 5 to 15 degrees, FIG. 7a shows a plan view, and FIG. 7b shows a side view. The nozzle 62a is positioned at a position set back by a predetermined amount in the range of 5 to 30 degrees described above.

  As is clear from FIG. 6a, when the nozzle 62a is not inclined, the expansion of the coolant K only reaches the coolant width. On the other hand, when the inclination angle of the coolant K is inclined in the range of 5 to 15 degrees as shown in FIG. 7a, and the discharge area of the coolant K with respect to the grinding roller 5 is set in the range of 1/4 to 1/3 of the full width L2. It can be seen that the coolant K effectively spreads over the entire area of the grinding roller 5. The reason why the upper limit of the inclination angle is set to about 15 degrees is due to the optimum condition including the effect of effectively blowing off abrasive grains and grinding scraps by the high-pressure coolant K.

[Consideration of adhered abrasive grains to be removed by coolant]
FIG. 8 shows a cross-sectional view (cross-sectional photograph) in which abrasive grains are caught in the metal belt and the metal belt is cracked. The diameter of the abrasive grains is 30 μm or more, and when the abrasive grains larger than the diameter bite into the metal belt and become scratched (F region), the scratch becomes the starting point for cutting the endless metal belt. It reaches. In addition, the metal belt shown in FIG. 8 is a product that has undergone a rolling process, and has scratches with a depth of 15 μm or more. Therefore, at the stage where the grinding process of the endless metal belt is completed, it is necessary to reliably remove abrasive grains having a diameter of about 30 μm or more from the surface of the metal belt.

  The outline of the grinding system of the present invention will be described later. In such a system, rough grinding of both end faces of the metal belt is performed, then finish grinding is performed, and finally, inner and outer peripheral surfaces of the metal belt are ground. It is. The grinding brush used in this rough grinding process is # 80 abrasive grain, the grinding brush used in the finish grinding process is # 320 abrasive grain, and the grinding brush used in the final inner and outer peripheral surface grinding process 9a and 9b show the ratio of the distribution of abrasive grains contained in each grinding brush and the weight of abrasive grains generated when grinding an endless metal belt of one ring, respectively, when # 120 abrasive grains are used. It shows.

  In FIG. 9a, P1 is a graph relating to the # 80 abrasive grains, Q1 is a graph relating to the # 320 abrasive grains, and R1 is a graph relating to the # 120 abrasive grains. As is clear from these graphs, in all the abrasive grains of all specifications, the abrasive grains having a diameter of 30 μm or more that can cause fatal damage to the metal belt described in FIG. I understand. That is, unless the abrasive grains generated in the grinding process and adhering to the metal belt are almost completely removed, the cause of damage that greatly reduces the durability of the metal belt cannot be wiped out.

  In FIG. 9b, P2 is a graph relating to the # 80 abrasive grains, Q2 is a graph relating to the # 320 abrasive grains, and R2 is a graph relating to the # 120 abrasive grains. The same result is obtained with respect to the generated abrasive weight shown in FIG. 9b. In this experiment, the total weight of the abrasive grains having a diameter of 30 μm or more is 0.049 g, which is 99.8% of the entire abrasive grains. It has been found.

[Study on Adhesive Force and Self-Weight of Abrasive Grain Adhering to Metal Belt Surface]
Next, the adhesive force of the abrasive grains adhering to the metal belt surface is calculated. FIG. 10 is a schematic diagram for explaining the adhesive force of abrasive grains acting on the metal belt b stretched between the driving roller 1 and the driven roller 2. Here, on the upper surface of the metal belt b, the sum of the adhesion force F and the abrasive weight Fg is the adhesion force that needs to be blown away by the coolant. On the other hand, on the lower surface of the metal belt b, the value obtained by subtracting the abrasive weight: Fg from the adhesion force F is the adhesion force that needs to be blown away by the coolant. That is, it is more effective to remove the adhered abrasive grains on the lower surface of the metal belt b, and the abrasive grains can be removed with a low-pressure coolant.

  As the adhesive force of the abrasive grains described above, the Van der Waals force (van der Waals force) and the liquid cross-linking force acting on the particles are obtained, and the adhesive force is calculated from the sum thereof.

  FIG. 11a shows the sum of the van der Waals force and the liquid bridging force (graph T2), the abrasive weight (graph T3), the adhesion force: F and the abrasive weight: Fg (graph T1), and adhesion force. : F and abrasive weight: Fg (graph T4), respectively, and FIG. 11b shows the same weight distribution of the generated abrasive as FIG. 9b. From the graph T4 in FIG. 11a, it can be seen that abrasive grains having a diameter of 105 μm or more fall as they are under their own weight. Therefore, it can be understood that the abrasive grains having a smaller diameter need to be removed by the coolant as a result of having a higher adhesion than the dead weight. In addition, in the graph T4, the abrasive grain size giving the maximum value is about 64 μm, and this is assumed that a scratch with a diameter of about 30 μm where the metal belt frequently breaks is a scratch of about 60 μm before rolling. Agree with Therefore, it is necessary to set a coolant pressure and a nozzle angle that can reliably remove abrasive grains having a diameter of about 60 μm.

[Consideration of nozzle angle to supply coolant to metal belt outer surface]
Based on FIGS. 12a to 12d, the abrasive grain size and other conditions were set to arbitrary conditions that can be generally assumed, and the nozzle inclination angle was calculated. The contents of the calculation are explained / described below.

  First, each value in FIG. 12a is calculated. Here, assuming that the abrasive grain has a diameter of 63.5 μm, the force acting on the abrasive grain is obtained.

1) Van der Waals force acting on abrasive grains: F _v = H · D / (12Z ² ), which is 4.96 μN. Here, H is a Hamaker constant and H = 15 · 10 ⁻²⁰ J, Z is a separation distance between a particle and a plane, Z = 0.4 nm, and D is a particle diameter of 63.5 μm.

2) Liquid cross-linking force: From F _L = 2 · π · σ · D / 2 · cos θ, 7.26 μN. Here, σ is a surface tension of water of 0.0728 N / m, θ is a contact angle of 60 degrees (45 degrees for stainless steel and 70 degrees for aluminum), and D is a particle diameter of 63.5 μm.

3) _Gravity: the F g = 4/3 · π · (D / 2) 3 · ρ · g = 4.27μN. Here, [rho is the case of SiC in specific gravity in the case of ^{_{3.25g / cm 3, Al 2 O}} 3 3.99g / cm 3, g is 9.8 m / ^{s 2} acceleration of gravity.

Normal resistance acting on abrasive grains: N is N = F _v + F _L −F _g = 7.95 μN, and friction resistance when rolling is applied with a rolling friction coefficient: μ = 0.01: F _reg = μN = 0.0795 μN.

Since the metal belt rotates and moves with the abrasive grains adhered, the impulse of the abrasive grains at that time is F _mv · dt = m · V = 45.17 ng · m / s. Here, m = 435.7 ng and V = 0.104 m / s.

As shown in FIG. 12b, when the width of the metal belt is 9.9 mm and the diameter of the coolant discharged to the metal belt is φ15 mm, the time for the abrasive grains to pass through the coolant discharge range can be calculated as 0.109 s. The force required to cancel the kinetic energy of the abrasive grains transmitted by the metal belt is F _mV = m · V / dt = 0.00042 μN.

From the above, the force parallel to the metal belt required to blow off the attached abrasive grains is F _reg + F _mV = 0.0799 μN. The abrasive grains can be removed at a stage where the drag force applied by the coolant exceeds the drag force.

Assuming that the pressure inside the coolant pipe is P _O , the pipe diameter is D _O , the coolant pressure hitting the abrasive grains is P, the diameter of the region where the coolant acts on the metal belt is D ₁ , and the nozzle efficiency is η, then P = η - the ^{_{D O 2 / D 1 2 ·}} P O /5=0.061MPa. Here, η = 0.5, D _O = 9.53 mm, and D ₁ = 15 mm.

The force at which this water pressure is transmitted to the abrasive grains (diameter is D): F _c = 1/2 · π · (D / 2) ² · P = 479.4 μN.

When the coolant angle is γ shown in FIG. 12 a, the condition for the coolant to fly abrasive grains is F _c sin γ> F _reg + F _mV .

As shown in FIG. 12c, when the nozzle tilt angle is α, the coolant injection angle is β, and the separation between the nozzle and the metal belt is L ₃ (= 10 mm), α> β / 2 + γ, L3 = 10 mm, γ = 0.1 _{^{°, β / 2 = sin -1 (}} (D 1/2) / L 3) = 48.6 degrees and becomes, alpha> 48.7 degrees is the inclination angle range of the nozzles in the setting conditions.

[Consideration of Necessity of Cooling of Grinding Roller]
In the grinding roller, rubber which is a kind of polymer is used as a binder for the grindstone, and its stress-strain curve is shown in FIG. In addition, in the same figure, a model diagram in the case where force: F acts on a rod member having a length: l and a cross-sectional area: _{AO made} of rubber is also shown. As is apparent from FIG. 13, when the temperature rises during grinding, the rubber as the binder is softened, and the binder is easily detached from the rotating shaft constituting the grinding roller.

  For example, in the case of urethane rubber, as shown in FIG. 14a, the glass transition temperature is 241 K (−32 ° C.). Therefore, considering the practical temperature of 0 to 60 ° C., the rubber plateau at the normalized temperature of 1.13 to 1.38. State is maintained. However, when the grindstone generates heat and exceeds 100 ° C., the normalized temperature jumps to 1.55, transitions from the rubber plateau region to the viscous flow region, and if a load is applied in this state, the grindstone cannot maintain its shape. End up. For these reasons, it is important to actively cool the surface of the grinding roller in the grinding process. The molecular structures at points b, c, and d in the graph of FIG. 14a are schematically shown in FIGS. 14b, 14c, and 14d, respectively.

  FIG. 15 is a graph showing the continuous processing time, when the grinding roller is cooled (graph U2), and when not cooled (graph U1). For example, the processing time exceeds about 100 ° C. in about 3 hours, and thereafter, the grinding stone cannot maintain its shape, resulting in a deviation from the rotating shaft.

  Next, an end face grinding apparatus will be described. As shown in FIG. 16, the end surface grinding apparatus 200 includes a plurality of segment brushes 71 a, 71 a,..., 72 a, 72 a,. A holding portion that holds the metal belt b in a position that is opposite to the tip of the segment brush 71a and spans the metal belt b between two rollers (the driving roller 1a and the driven roller 2a). The holding unit has two rollers mounted on one side surface of a casing (not shown) in which a motor (not shown) that rotates the driving shaft of the driving roller 1a is supported while supporting the two rollers. Here, the driven roller 2a is configured to be movable on one side surface of the casing. For example, the rotating shaft that supports the driven roller 2a is attached to the tip of the piston rod of the cylinder unit, and the driven roller 2a can be separated from / close to the driving roller 1a by expansion and contraction of the piston rod. On the other hand, the grinding roller 71, 72 is mounted on one side surface of a casing (not shown) in which a motor for rotating the two grinding rollers 71, 72 is incorporated.

The segment brushes 71a and 72a are ground rollers 71 and 72 in a posture in which a large number of nylon wire materials in which abrasive grains such as alumina (Al ₂ O ₃ ) and silicon carbide (SiC) are melted are bundled with metal cylinders. Projecting a predetermined length from the end face.

  The grinding rollers 71 and 72 are controlled to rotate in the same direction, and at one appropriate position in the straight section of the metal belt b that is stretched in a track shape while being stretched over the driving roller 1a and the driven roller 2a. As a result of the difference between the incident direction of the grinding roller 71 and the retracting direction of the other grinding roller 72, the belt can be prevented from falling in the rotational direction of one grinding roller by the rotation of the other grinding roller during belt end face grinding. Furthermore, it becomes possible to grind the two corners of the belt end face at once with two grinding rollers, and the grinding efficiency can be increased. When the metal belt b stretched over the driving roller 1a and the driven roller 2a is stretched in a track shape, the driven roller 2a is separated from the driving roller 1a after the belt is stretched over the two rollers 1a and 2a. What is necessary is just to make it move.

  The segment brushes 71a and 72a attached to the grinding rollers 71 and 72, respectively, are such that one end of the nylon wire is housed in a metal cylinder, and the metal cylinder bundles the nylon wire at the other end. (Not shown). The end of the cylinder is closed, and the piston rod of the cylinder unit is in contact with the end surface. In order to ensure the rigidity of the nylon wire during grinding, the protruding length of the nylon wire from the cylinder is set to an appropriate length. Here, when the tip of the nylon wire gradually wears due to grinding and the grinding force decreases, the decrease in the grinding force is detected by a pressure sensor (not shown), and the piston rod extends a predetermined length based on the detection result. Can be configured to. Also in the end surface grinding apparatus 200, a nozzle 73a and a flow path 73b for supplying coolant to an appropriate belt portion are provided.

Next, based on FIGS. 17-30, the outline | summary of a grinding process system and the flow of the action | operation are demonstrated.
The outline of the grinding system 300 will be described with reference to FIGS. 17 and 18. The four end face grinding devices 200A, 200B, 200C, and 200D described in FIG. 16 are arranged in a line at equal intervals. Here, the end surface grinding apparatus 200A (or 200B, 200C, 200D) includes a holding portion 200a including a driving roller 1a and a driven roller 2a for holding / rotating an endless metal belt b, and a casing C3 including them. And the grinding part 200b which consists of the segment brushes 71 and 72 and the casing C4 which comprises them is comprised. Further, a grinding apparatus 100 that grinds the inner and outer peripheral surfaces of the metal belt b is installed in front of the end surface grinding apparatus 200D in the feeding direction. The grinding apparatus 100 includes a holding unit 100a including a driving roller 1 and a driven roller 2 that hold / rotate a metal belt b, and a casing C1 including the driving roller 1, a first grinding roller 3, and a second grinding roller. 4 and a grinding part 100b composed of a casing C2 provided therewith.

  .. Between the holding portions 200a,... Constituting the respective end face grinding devices 200A, 200B, 200C, 200D, and the grinding portions 200b,... And the holding portions 100a,. A transfer 8 that can reciprocate between adjacent processing apparatuses is provided in between. Here, each end surface grinding apparatus 200A, 200B, 200C, 200D is disposed such that the disposition positions of the holding portions 200a and the grinding portions 200b are alternately reversed. This is to grind both end faces of the metal belt b alternately. The metal belt b sent to the shooter 94 is sent to the transfer 8 by the loader 93, and in turn as the transfer 8 reciprocates. To the end face grinding machine. The end face grinding apparatus is an apparatus that performs rough grinding of one end face of the metal belt b, an apparatus that roughly grinds the other end face of the metal belt b (end face grinding apparatus 200B), in order from the end face grinding apparatus 200A close to the shooter 94. An apparatus for finishing and grinding one end surface of the metal belt b (end surface grinding apparatus 200C) and an apparatus for finishing and grinding the other end surface of the metal belt b (end surface grinding apparatus 200D) are provided. Here, the transfer 8 is composed of rod bodies 81 and 82 provided side by side, and chuck members 83 and 83 attached to opposing surfaces of the rod bodies 81 and 82 at intervals between the respective end face grinding devices. The metal belt b is fed in a posture in which the metal belt b is gripped by the chuck members 83 and 83. The chuck member 83 is formed of an appropriate material (for example, a resin material) that does not damage the surface of the metal belt b during chucking. Finally, grinding dust or the like attached to the outer peripheral surface and inner peripheral surface of the metal belt b is removed by the grinding apparatus 100. The metal belt b whose entire circumference is ground by each grinding device is collected from the transfer 8 by the loader 95 and transferred to the belt conveyor 96. .. Are attached to the lower ends of the casing C3 of the holding part 200a and the casing C4 of the grinding part 200b constituting each end face grinding apparatus 200A,. 91, 91, ... can be moved on the rails 92, 92. The holding part 200a and the grinding part 200b of each end face grinding apparatus 200A,... Automatically move to the transfer 8 side or automatically move away from the transfer 8 at an appropriate timing accompanying the reciprocating movement of the transfer 8. Is controlled.

  Next, the operation flow of the grinding system 300 will be described. First, as shown in FIGS. 17 and 18, the loader 93 moves the metal belt b fed into the shooter 94 in the direction of the arrow X in FIG. 17 and hooks it on the inner peripheral surface of the metal belt b. As 93 moves in the direction of arrow Y, it fits between chuck members 83, 83.

  Next, moving to FIGS. 19 and 20, the loader 93 after the metal belt b is fitted between the chuck members 83 and 83 moves in the direction of the arrow Y so as to be separated from the transfer 8. The finished metal belt b is moved to the end face grinding apparatus 200A that first performs rough grinding (arrow Y).

  21 and 22, the holding portion 200 a moves to the vicinity of the metal belt b disposed in front (arrow X), and a part of the driving roller 1 a and the driven roller 2 a is placed in the inner peripheral surface of the metal belt b. Make contact. Here, by moving the driven roller 2a away from the drive roller 1a (arrow Y), the metal belt b is pulled in a track shape between the two rollers, and the metal belt b is pulled from the chuck members 83 and 83. b is in a separated state. Note that the loader 93 has moved to the shooter 94 side to convey the next metal belt b (arrow Z).

  23 and 24, with the metal belt b pulled in a track shape between the two rollers, the holding part 200a is moved to the grinding part 200b side (arrow X), and the rotating bodies 71 and 72 are rotated in the same direction. The one end surface of the metal belt b is roughly ground while being processed. In this rough grinding process, since the metal belt b has already been released from the chuck members 83, 83, even if the transfer 8 reciprocates, it does not become an obstacle to the rough grinding. Therefore, in the course of rough grinding, the transfer 8 moves to the shooter 94 side (arrow Y), and the next metal belt b already fed into the shooter 94 is collected. As described above, the loader 93 moves to the metal belt b side (arrow Z) and hooks the metal belt b.

  25 and 26, the metal belt b is fitted into the chuck members 83 and 83 by the loader 93 (arrow Z). On the other hand, when the rough grinding of the one end surface of the metal belt b is completed, the holding portion 200a is slightly separated from the grinding portion 200b (arrow Y), and the metal belt b is disposed between the opposing chuck members 83 and 83. In this state, the driven roller 2a is moved to the drive roller 1a side (arrow X), and the metal belt b pulled by the two rollers is released and is held between the chuck members 83 and 83. .

  Moving to FIGS. 27 and 28, the holding portion 200a is moved back to an extent that does not hinder the transfer 8 (arrow X), and the transfer 8 holding the two metal belts b and b is moved (arrow Y). This movement is to convey the metal belt b whose one end face has been coarsely ground to the next end face grinding apparatus 200B, and by this conveyance, the end face grinding apparatus in which the next metal belt b first performs rough grinding. It is conveyed up to 200A. At this time, the loader 93 moves toward the shooter 93 to accommodate the next metal belt b (arrow Z).

  29 and 30, by sequentially executing the above-described series of flows, the metal belt b whose one end face has been ground is conveyed to the next end face grinding apparatus, and at the same time, a new metal belt b is removed from the shooter 94. It will be collected. Here, when the outer peripheral surface and the inner peripheral surface are finally ground by the grinding device 100, the grinding device 100 moves to the transfer 8 side (arrow X), and the second grinding roller 5 moves the metal. The outer peripheral surface of the belt b is ground by the first grinding roller 3 on the inner peripheral surface of the metal belt b.

  The metal belt b after all grinding is transferred to the belt conveyor 96 via the loader 95 and conveyed.

  According to the grinding system of the present invention, it is possible to automatically grind the rough grinding and finish grinding of the belt end face and the grinding of the outer peripheral surface and inner peripheral surface of the belt. Nylon wire attached to the rotating body that constitutes each grinding body can always secure a constant pressing force while automatically detecting the degree of wear as described above, so the time required to replace the nylon wire Loss can be reduced as much as possible. In particular, in the grinding machine, when grinding the inner and outer peripheral surfaces of the metal belt, the grinding process is performed when the grinding dust is reliably removed, and the grinding roller is attached to the surface of the grinding dust. By removing and effectively cooling, it becomes possible to manufacture a high-quality endless metal belt.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention. For example, in addition to the rotation of the rotating body mounted on the grinding body, each segment brush disposed in the circumferential direction may also rotate about its axis.

It is the perspective view which showed the outline | summary of the grinding-work apparatus of this invention. It is the figure which showed the front view of the grinding processing apparatus typically. It is the figure which showed the top view of the grinding processing apparatus typically. (A) is the top view which showed that the nozzle which supplies coolant to the grinding roller which grinds the outer peripheral surface of a metal belt was set back, and was positioned, (b) is the nozzle shown to (a) It is the side view which showed the inclination attitude | position. It is a schematic diagram of the result of having verified the spread of the coolant supplied to a grinding roller by the position of the nozzle shown in FIG. 4, (a) is a schematic diagram in the case of an appropriate setback amount, (b), (c) FIG. 4 is a schematic diagram in the case of an undesirable setback amount. It is a schematic diagram of the result of having verified the spread of the coolant supplied to a grinding roller by the inclination angle of the nozzle shown in FIG. 4, (a) is a plan view in the case of an undesirable inclination angle (horizontal), (b) It is the side view. FIG. 5 is a schematic diagram of the result of verifying the spread of coolant supplied to the grinding roller according to the inclination angle of the nozzle shown in FIG. 4, (a) is a plan view in the case of an appropriate inclination angle, and (b) is a side view thereof. It is. It is sectional drawing which showed that the crack had arisen because the abrasive grain meshed | engaged with the metal belt. (A) is the graph which showed the distribution ratio for every magnitude | size of the abrasive grain contained in a grinding roller or a grinding brush, (b) is the magnitude | size of the abrasive grain generate | occur | produced when grinding one endless metal belt It is the graph which showed the weight for every cage. It is the schematic diagram explaining the adhesive force and gravity of the abrasive grain adhering to the endless metal belt rotated with a grinding processing apparatus. (A) is the graph which showed the adhesion force and gravity of an abrasive grain, and the power which considered both according to the magnitude | size of an abrasive grain, (b) generate | occur | produces when grinding one endless metal belt It is the graph which showed the weight for every magnitude | size of the abrasive grain to do. (A) is the schematic diagram which showed the force which acts on an abrasive grain, (b) is the schematic diagram which showed the relationship between the width | variety of an endless metal belt, and the diameter of coolant, (c) is a nozzle ( It is the schematic diagram which showed the angle of coolant. It is a stress-strain curve of a polymer material. (A) is a graph showing the relationship between the temperature of the polymer material and Young's modulus, (b) is the molecular structure of the highly separated material at point b in FIG. A, and (c) is the high at point c in FIG. (D) is the figure which showed the molecular structure of the high-separation material in the d point of FIG. It is the graph which showed the relationship between the continuous grinding process time and the grindstone surface temperature. It is the perspective view which showed the outline | summary of the end surface grinding apparatus. It is the top view which showed the operating condition of the grinding system of this invention. It is the XVIII-XVIII arrow line view of FIG. FIG. 18 is a plan view showing an operating state of the grinding system following FIG. 17. It is a XX-XX arrow line view of FIG. FIG. 20 is a plan view showing an operating state of the grinding system following FIG. 19. It is XXII-XXII arrow line view of FIG. FIG. 22 is a plan view showing an operating state of the grinding system following FIG. 21. It is a XXIV-XXIV arrow line view of FIG. FIG. 24 is a plan view showing an operating state of the grinding system following FIG. 23. It is XXVI-XXVI arrow line view of FIG. It is the top view which showed the operating condition of the grinding system following FIG. It is a XXVIII-XXVIII arrow line view of FIG. FIG. 28 is a plan view showing an operating state of the grinding system following FIG. 27. It is XXX-XXX arrow line view of FIG. (A) is the perspective view which showed a part of CVT belt, (b) is sectional drawing of the belt before barrel grinding | polishing, and sectional drawing of the belt after barrel grinding | polishing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive roller, 2 ... Driven roller, 3 ... Grinding roller (1st grinding roller), 4 ... Grinding roller (2nd grinding roller), 32, 41, 52 ... Feed screw mechanism, 31, 51 ... Spindle motor , 61a, 62a, 63a, 64a, 65a ... nozzle, 61b, 62b, 63b, 64b, 65b, 73 ... flow path, 71 ... grinding roller (third grinding roller), 72 ... grinding roller (fourth grinding roller) , 71a, 72a ... segment brush, 8 ... transfer (conveying device), 81, 82 ... rod, 83 ... chuck member, 84 ... leg, 91 ... caster, 92 ... rail, 93 ... loader, 94 ... shooter, 95 ... Loader, 96 ... Belt conveyor, 100 ... Grinding device, 200A, 200B, 200C, 200D ... End surface grinding device, 100a, 200a ... Holding unit, 100b 200b ... grinding unit, 300 ... grinding system, b ... belt, C1, C2, C3, C4 ... casing, K ... Coolant

Claims (6)

A grinding device for grinding inner and outer peripheral surfaces of an endless metal belt,
The grinding apparatus includes a driving roller and a driven roller that span and rotate the metal belt,
A first grinding roller for grinding the inner peripheral surface of the metal belt between the two rollers and contacting a part of the inner peripheral surface below the metal belt;
A backup roller disposed at a position sandwiching the first grinding roller and the metal belt;
A second grinding roller disposed at a position sandwiching the metal belt with either one of the driving roller or the driven roller, and grinding an outer peripheral surface of the metal belt;
A first coolant supply unit disposed on the upstream side where the metal belt rotates and enters between the first grinding roller and the backup roller, and supplies coolant to an outer peripheral surface of the lower surface of the metal belt;
A grinding apparatus comprising at least a second coolant supply unit and a third coolant supply unit that supply coolant to each of the first grinding roller and the second grinding roller.   The first coolant supply unit is adjusted such that the coolant is provided in a direction inclined by a predetermined angle from the vertical direction in a direction opposite to the rotation direction of the metal belt with respect to the outer peripheral surface of the lower surface of the metal belt. The grinding apparatus according to claim 1. Both the first grinding roller and the second grinding roller are controlled to rotate in opposite directions with respect to the rotation direction of the metal belt,
The third coolant supply unit is disposed above or below the second grinding roller and at a position deviated by a predetermined amount from the vertical center of the grinding roller toward the driving roller or the driven roller. And it is adjusted so that coolant may be supplied in the direction of a predetermined inclination with respect to the axis of rotation of the second grinding roller,
The second coolant supply unit is disposed above the first grinding roller and at a position deviated from the vertical center of the grinding roller by a predetermined amount in a direction opposite to the rotation direction of the grinding roller; and The grinding apparatus according to claim 1 or 2, wherein the grinding apparatus is adjusted so as to supply a coolant in a predetermined inclination angle direction with respect to a rotation axis of the first grinding roller. A second driving roller and a second driven roller that are wound around the metal belt and rotated, a third grinding roller provided with a plurality of first grinding brushes in the circumferential direction, and a second grinding brush in the circumferential direction A plurality of fourth grinding rollers are provided, the first grinding brush and the second grinding brush are spaced apart from each other, and are opposed to the second driving roller and the second driven roller. An end surface grinding apparatus, wherein the third grinding roller and the fourth grinding roller are disposed at positions, and the end surface of the metal belt is ground by the third grinding roller and the fourth grinding roller;
A grinding apparatus for grinding the inner and outer peripheral surfaces of the metal belt according to any one of claims 1 to 3,
A plurality of the end surface grinding devices are arranged in a line, and the metal belt is sequentially conveyed to the respective end surface grinding devices, and the metal is interposed between the driving roller and the driven roller of each end surface grinding device and the grinding device. A conveyor device for attaching and detaching the belt is further provided. After one end surface of the metal belt is ground by an appropriate end surface grinding device, the other end surface of the metal belt is ground by the next end surface grinding device. A grinding system characterized in that the inner and outer peripheral surfaces of the belt are ground by the grinding device.   The grinding apparatus according to any one of claims 1 to 3, wherein the endless metal belt is a CVT belt formed by laminating a plurality of metal rings.   The grinding system according to claim 4, wherein the endless metal belt is a CVT belt in which a plurality of metal rings are laminated.

Images