JP2012179692A - Processing fluid feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing fluid feeding device 1 that detects abrasion of a floating nozzle with a simply-structured position detector.SOLUTION: There are provided a dresser 5 for subjecting a peripheral surface 4 of a grinding stone 3 to truing and dressing, and a nozzle 25 for feeding a processing fluid toward the peripheral surface. The nozzle is provided with an opening 26 opening on the peripheral surface and flanges 27a, 27b extending to both surfaces of the grinding stone on both sides of the opening. There are provided a biasing member 14 for biasing the nozzle to the peripheral surface of the grinding stone, a nozzle supporting member 11 for supporting the nozzle to arbitrary directions in which the nozzle is energized, a position detector 32 for detecting a relative position between the nozzle supporting member and the nozzle. The nozzle supporting member is fixed to a dresser supporting table 6 for rotatably supporting the dresser. As the dresser, a rotary dresser is used. A monocrystal diamond dresser is movable in an axial direction of the grinding stone. The nozzle supporting member is mounted on the dresser supporting table movably in the axial direction of the grinding stone so as to enable the position of the nozzle supporting member to be kept by the flanges relatively to the grinding stone.

Description

  The present invention relates to a machining liquid supply device that supplies a machining liquid during truing or dressing processing of a grinding wheel by a dresser.

  Conventionally, in a cylindrical grinder or centerless grinder that grinds the outer periphery of a workpiece with a grindstone, a dresser is provided for truing (reforming) or dressing (revising) the outer periphery of the grindstone (hereinafter referred to as “dressing”). ing. In performing dressing and the like, for example, in Patent Document 1, in order to perform dressing and the like with high accuracy using a rotary dresser, a working fluid is supplied to the grindstone to stabilize the temperature of the grindstone.

  However, in the thing of patent document 1, since the nozzle which supplies a process liquid is provided in the position spaced apart from the grindstone outer peripheral surface, the process liquid discharged from the nozzle necessarily acts effectively with respect to a grindstone. Is not limited. In addition, there is a problem that the supply of the machining fluid is hindered by the accompanying air flow around the outer periphery of the rotating grindstone, and a sufficient machining fluid is not supplied to the machining point.

  Therefore, for example, in Patent Documents 2 and 3, the nozzle opening is opened toward the outer peripheral surface of the grindstone, and flanges extending on both side surfaces of the grindstone are provided on both sides of the opening. In addition, the shape of the outer peripheral surface of the grindstone at the tip of the nozzle is formed similar to the cross-sectional shape of the outer periphery of the grindstone. The machining fluid is supplied to the machining point.

  Further, the nozzle is worn by contact with the outer periphery of the grindstone, grindstone particles detached from the grindstone that is rotated with the processing liquid, or the like. Therefore, in Patent Document 2, the main body provided with the nozzle can be moved in the direction perpendicular to the grindstone axis, and is further urged by a spring or the like to balance with the machining fluid jet discharged from the nozzle opening. The gap between the outer peripheral surface and the nozzle opening can be adjusted, and an appropriate gap can be obtained according to the wear of the grindstone or the nozzle. This is called a floating nozzle. On the other hand, in Patent Document 3, the nozzle position is adjusted by measuring the nozzle position with a dial gauge or the like and controlling the gap.

  By the way, the grindstone side is also worn by use. In particular, the outer peripheral surface on the side of the grindstone is shaved during processing such as dressing, and the amount thereof is larger than the amount of wear during processing. When dressing, the distance between the grindstone and the dresser is important. Therefore, in the case of Patent Document 1, the position of the dresser can be controlled by the contact between the grindstone and the dresser by the contact sensor regardless of the wear amount of the grindstone. Further, by utilizing this, the grinding wheel wear amount (outer diameter position, etc.) can be calculated.

JP 2001-038620 A JP 2005-303305 A JP 2003-311618 A

  On the other hand, the nozzle must be monitored for wear until the nozzle opening is worn and no longer functions as a nozzle. However, the nozzle is attached to a grinder body or a grindstone head stand, and even if it is intended to detect the wear amount, it must be determined whether it is the wear amount on the grindstone side or the wear amount on the nozzle side. For this reason, it is necessary to confirm with the naked eye, to calculate and obtain the above-described grinding wheel wear amount, or to use another detection device.

  In view of such problems, the problem of the present invention is to provide a limit switch without complicated calculation of the wear of the floating nozzle that supplies the machining fluid while urging the nozzle that opens to the outer peripheral surface of the grindstone to the outer peripheral surface of the grindstone. It is an object of the present invention to provide a machining liquid supply device that can be detected by a simple position detector such as a photoelectric switch or a proximity switch.

  In the present invention, a cylindrical or disk-shaped grinding wheel attached to a rotating shaft, a dresser for truing or dressing the outer peripheral surface of the grinding wheel by moving back and forth toward the outer peripheral surface of the grinding wheel, and an outer periphery of the grinding wheel A nozzle for supplying a machining fluid toward the surface, wherein the nozzle extends to both sides of the grinding wheel on both sides of the opening and an opening that opens on the outer peripheral surface of the grinding wheel. A nozzle support member for biasing the nozzle toward the outer peripheral surface of the grinding wheel, the nozzle support member for supporting the nozzle in a biasing direction, and the nozzle support member. And a position detector for detecting a relative position between the nozzle and the nozzle, wherein the nozzle support member is provided on a dresser support base that pivotally supports the dresser. It was to solve the problems described above.

  That is, the floating nozzle is provided on the outer peripheral side of the grinding wheel, the nozzle support member is fixed on the dresser support base side, and the positions of the nozzle support member and the nozzle are detected. Even if the grinding wheel wears out, the dresser hardly wears, so the relative distance between the dresser support and the outer peripheral surface of the grinding wheel does not change during dressing or the like. Since the tip of the nozzle comes into contact with the outer peripheral surface of the grinding wheel via the processing liquid, a change in the relative distance between the tip of the nozzle and the dresser support becomes the amount of wear of the nozzle. A change in the relative distance between the nozzle tip and the dresser support can be detected by a position detector, and when a predetermined amount of wear, that is, a predetermined amount of movement is reached, a detection signal or the like can be sent to notify an abnormality.

  In addition, when the dresser is a total type such as a rotary dresser, it is only necessary to control the grinding wheel axis perpendicularly. Therefore, in the invention according to claim 2, the dresser is a machining fluid supply device which is a rotary dresser.

  Further, a dressing dresser such as a single stone dresser is moved in the grinding wheel axis direction to perform dressing or the like. In this case, the flange portion of the floating nozzle interferes with the grinding wheel. Therefore, in the invention described in claim 3, the dresser is configured to be movable in the grinding wheel axis direction, and the nozzle support member can be held in position by the flange with respect to the grinding wheel. The machining liquid supply device is attached to the dresser support so as to be movable in the axial direction. According to a fourth aspect of the present invention, there is provided a machining fluid supply device in which the dresser is a single crystal diamond dresser.

  In the present invention, the floating nozzle is provided on the outer peripheral side of the grinding wheel, the nozzle support member is fixed to the dresser support base side, the position of the nozzle support member and the nozzle is detected, and the amount of wear of the nozzle is easily detected. Therefore, complicated calculation is not required, and the wear amount of the nozzle can be detected with a simple position detector. Further, the present invention is suitable when the dresser is a general type such as a rotary dresser.

  Furthermore, in the invention described in claim 4, since the nozzle support member can be slidably held in the grinding wheel axis direction, the wear amount of the nozzle can be detected even with a single stone or a multi-stone dresser. It became a machining fluid supply device. In the invention described in claim 4, the dresser can be used for a dressing dresser such as a single crystal diamond dresser.

It is explanatory drawing of the processing liquid supply apparatus using the rotary dresser which shows embodiment of this invention, (a) is a front view, (b) is the sectional view on the AA line of (a). It is explanatory drawing of the processing liquid supply apparatus using the single-stone diamond dresser which shows other embodiment of this invention, (a) is a front view, (b) is the BB sectional drawing of (a). . It is a fragmentary sectional view.

  Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a working fluid supply apparatus 1 according to the present invention includes a grinding wheel base 10 provided on a grinding machine table (not shown) and a disk attached to a rotary shaft 2 of the grinding wheel base and driven to rotate by a motor (not shown). A shaped grinding wheel 3 is provided. A dresser 5 for truing or dressing the outer peripheral surface 4 of the grinding wheel is rotatably supported on a dresser support base 6. By moving the dresser support 6, the dresser 5 can be advanced and retracted toward the grinding wheel outer peripheral surface 4 (in the direction of arrow 7 in the figure). A nozzle support member 11 is attached to the dresser support base 6 via a hinge 8 so as to be adjacent to the dresser 5 in the grindstone rotation direction.

  The nozzle support member 11 has an insertion hole 12 extending in a direction perpendicular to the grinding wheel axis, and a spring hole 13 is formed at the lower end of the insertion hole. A nozzle body 21 having a communication hole 22 in the insertion hole 12 is inserted so as to be slidable in the central axis direction of the insertion hole. A nozzle 25 is provided at the tip of the nozzle body 21. The nozzle 25 is provided with an opening 26 that opens to the outer peripheral surface of the grinding wheel, and flanges 27a and 27b that extend to both sides 3a and 3b of the grinding wheel 3 on both sides of the opening. The clearance between the side surfaces 3a and 3b of the grinding wheel and the flange portions 27a and 274b is 0.4 to 1 mm in both width directions. Further, the opening surface 28 through which the opening 26 opens has substantially the same shape as the outer periphery 4 of the grinding wheel. The opening 26 communicates with the lower end of the communication hole 22. The other end of the communication hole 22 is connected to a machining liquid (lubrication) unit that supplies a machining liquid (not shown).

  A spring (biasing member) 14 is provided between the nozzle upper end 25a and the spring hole 13, and presses (biases) the nozzle 25 against the grinding wheel outer peripheral surface 4 side. When the force that the nozzle 25 presses the grindstone outer periphery 4 is generated by the weight of the nozzle body 21 and the nozzle 25, the spring 14 need not be mounted. A stopper 15 is provided on the upper part of the nozzle body, and prevents the nozzle body 21 from being detached downward by contacting the upper end 11a of the nozzle support member 11. The stopper 15 also serves as a detection body, and the stopper position can be detected by a proximity switch 32 provided on the nozzle support member. A signal is taken out when the proximity switch 32 detects the stopper 15. Further, a control device (not shown) is controlled so as to take out as a nozzle wear limit signal when the dresser 5 is in contact with the grinding wheel and there is a signal from the proximity switch 32.

  The operation of the machining fluid supply device 1 will be described. At a position where the dresser 5 and the nozzle 25 are separated from the grinding wheel 3, the dresser support base 6 is moved in the direction perpendicular to the grinding wheel axis while discharging the machining liquid from the nozzle, thereby bringing the dresser closer to the grinding wheel. When the nozzle opening 26 approaches the grinding wheel outer peripheral surface 4, the working fluid is supplied to the grinding wheel outer peripheral surface while maintaining a predetermined gap while being balanced with the spring 14 force by the reaction force of the processing fluid. The stopper 15 is separated from the proximity switch 32. Further, the dresser 5 is advanced to perform predetermined dressing or the like. Even if the grinding wheel 3 is worn, the proximity switch 32 does not detect the stopper 15. On the other hand, when the nozzle 25 is worn, the stopper 15 approaches the proximity switch 32, and when the predetermined amount of wear is reached, the proximity switch senses the stopper and outputs an abnormality detection signal. Thereby, the wear amount of the nozzle 25 can be reliably detected without being affected by the wear amount of the grinding wheel 3.

  Next, another embodiment of the present invention will be described with reference to FIG. In another embodiment, a single dresser is used. Components similar to those described above are denoted by the same reference numerals, and a part or all of the description is omitted. As shown in FIG. 2, the dresser 5 ′ of the machining fluid supply device 1 ′ has a diamond monolith 41 attached to the tip, and the dresser support 6 is placed in the direction perpendicular to the grinding wheel axis (arrow 7) and in the grinding wheel axis direction (arrow 9). By moving it, dressing of the outer peripheral surface of the grindstone is performed. A guide rail 42 is provided on the dresser support 6 in parallel with the grindstone axis. A linear slide 43 is provided so as to be relatively movable along the guide rail 42, and a nozzle support member 11 'is attached to the linear slide. A proximity switch 32 is provided on the linear slide 43.

  The operation of the machining fluid supply apparatus 1 ′ will be described. While the dresser 5 and the nozzle 25 are separated from the grinding wheel 3, the dresser support base 6 is moved in the direction perpendicular to the grinding wheel axis while discharging the processing liquid from the nozzle at the position where the collar portion 27 is closer to the shaft than the both sides of the grinding wheel. It is moved in the axial direction, and dressing or the like is performed by bringing the dresser 5 ′ closer to the grinding wheel 3. When the nozzle opening 26 approaches the grinding wheel outer peripheral surface 4, the working fluid is supplied to the grinding wheel outer peripheral surface while maintaining a predetermined gap while being balanced with the spring 14 force by the reaction force of the processing fluid. Others are the same as described above.

  The linear slide movement range may be the same as the dresser movement range. Since the dresser 5 ′ and the grinding wheel outer peripheral surface 4 do not need to be separated by a large distance, they are operated or controlled so that the grinding wheel 3 and the nozzle tip 25 b are not completely separated. In addition, when the front end of the grinding wheel, that is, the flange portion is separated from the grinding wheel, the grinding wheel is controlled manually or automatically so as to be positioned on the outer peripheral side surface of the grinding wheel again. In addition to this control, it goes without saying that a mechanism that prevents the relative position in the axial direction between the grinding wheel and the nozzle from shifting may be provided using a guide bar or a wire.

DESCRIPTION OF SYMBOLS 1, 1 'Process liquid supply apparatus 2 Rotating shaft 3 Grinding wheel 3a, 3b Grinding wheel both sides 4 Grinding wheel outer peripheral surface 5, 5' Dresser 6 Dresser support stand 11, 11 'Nozzle support member 14 Energizing member (spring)
25 Nozzle 26 Opening 27a, 27b ridge 32 Position detector

Claims (4)

  A cylindrical or disc-shaped grinding wheel attached to the rotating shaft, a dresser for truing or dressing the outer peripheral surface of the grinding wheel by moving back and forth toward the outer peripheral surface of the grinding wheel, and processing toward the outer peripheral surface of the grinding wheel In the machining liquid supply apparatus, the nozzle includes an opening that opens to an outer peripheral surface of the grinding wheel, and flanges that extend to both sides of the grinding wheel on both sides of the opening. A biasing member that biases the nozzle toward the outer peripheral surface of the grinding wheel, a nozzle support member that supports the nozzle in a biasing direction, and the nozzle support member and the nozzle. And a position detector that detects a relative position, wherein the nozzle support member is fixed to a dresser support that pivotally supports the dresser.   The machining fluid supply apparatus according to claim 1, wherein the dresser is a rotary dresser.   The dresser is movable in the grinding wheel axis direction, and the nozzle support member is attached to the dresser support base so as to be movable in the grinding wheel axis direction so that the nozzle support member can be held in position by the flange with respect to the grinding wheel. The machining fluid supply device according to claim 1, wherein the machining fluid supply device is provided.   4. The machining fluid supply apparatus according to claim 3, wherein the dresser is a single crystal diamond dresser.