JP5466554B2 - Coolant supply device - Google Patents

Description

  The present invention relates to a coolant supply device that supplies coolant to a grindstone that polishes an inner peripheral surface and an outer peripheral surface of a workpiece.

  In the case of polishing a workpiece, in order to cool the heat generated at a processing point where the grindstone is in contact with the workpiece, it has been conventionally practiced to inject a coolant (cooling liquid) such as cooling water to the processing point.

  In order to inject the coolant toward the grindstone, a technique is also known in which an operator directs the coolant nozzle to the processing point each time or automatically moves the coolant nozzle as the grindstone's outer diameter decreases ( Patent Literatures 1 to 3). The outer diameter of the grindstone becomes smaller due to the wear of the grindstone during workpiece grinding. However, the main cause of the decrease in the outer diameter of the grindstone is due to the treatment of grinding the grindstone by dressing to a new surface in order to eliminate clogging of the grindstone.

Japanese Patent Laid-Open No. 4-354673 JP 2001-121388 A JP 2001-9720 A

  By the way, when polishing the inner peripheral surface and outer peripheral surface of the workpiece in this way, conventionally, a dedicated grindstone for inner diameter polishing or outer diameter polishing is used, and a corresponding dedicated inner diameter polishing or outer surface is used. It is necessary to use a coolant supply device for diameter polishing.

  In the machine tools described in Patent Documents 1 and 2, when polishing the inner and outer peripheral surfaces of a workpiece, it is necessary to replace and use dedicated coolant supply devices for inner diameter polishing and outer diameter polishing. Therefore, when polishing the inner and outer peripheral surfaces of a workpiece with a single grinding machine, it is necessary to stop the grinding machine and then replace the grindstone and coolant supply device, resulting in poor work efficiency. is there.

  Further, in Patent Document 3, it is described that the cooling nozzle, the cleaning nozzle, and the support member on which the nozzle is mounted are exchanged according to the rotation direction of the grindstone. It is the same in terms of poor efficiency.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coolant supply device that does not require replacement of the coolant supply device during inner diameter polishing and outer diameter polishing.

In order to solve the above problems, a coolant supply device of the present invention is a coolant supply device that supplies coolant to a grindstone that selectively polishes the inner and outer peripheral surfaces of a workpiece, and includes a pair of arms. The first arm, which is one arm of the pair of arms, is formed with an inner diameter polishing injection port for injecting coolant onto the grindstone when the grindstone grinds the inner peripheral surface of the workpiece, the second arm and the other arm of the pair of arms, said grinding wheel the outer diameter polishing injection port for injecting a coolant into the grinding wheel when grinding the outer peripheral surface of the workpiece is formed, the inner diameter abrasive jet The apparatus further comprises means for switching between a coolant injection state from the opening and a coolant injection state from the outer diameter polishing injection port .

  According to this configuration, since the inner diameter polishing injection port is formed in one of the pair of arms and the outer diameter polishing injection port is formed in the other, the coolant supply device for inner diameter polishing and outer diameter polishing. No replacement is required. As a result, the processing efficiency is improved.

  In the present invention, “inner diameter polishing” refers to polishing the inner peripheral surface of a workpiece so as to have a predetermined inner diameter dimension and polishing the inner diameter. Further, “outer diameter polishing” refers to polishing the outer peripheral surface of a workpiece so as to have a predetermined outer diameter dimension, and polishing the outer diameter.

  Moreover, it is preferable to further include a moving mechanism that moves the pair of arms to change the distance between each arm of the pair of arms and the grindstone.

  According to this configuration, by providing a moving mechanism that can move both arms, it is possible to suppress the complexity of the structure of the coolant supply device, and to reduce manufacturing costs, maintenance costs, and the like.

  In the moving mechanism, an angle formed between a moving direction of the inner diameter polishing injection port or the outer diameter polishing injection port and a coolant injection direction of the inner diameter polishing injection port or the outer diameter polishing injection port is 90. It is preferable to move the pair of arms so as to be less than a degree.

  According to this configuration, the moving mechanism includes a movement direction of the inner diameter polishing injection port or the outer diameter polishing injection port and a coolant injection direction of the inner diameter polishing injection port or the outer diameter polishing injection port. Since the pair of arms are moved so that the angle formed is less than 90 degrees, each portion of the arm such as a nozzle is applied to the outer peripheral surface of the grindstone as the grindstone becomes smaller when performing inner diameter polishing or outer diameter polishing. It is possible to reduce the injection distance by moving without any problem. As a result, coolant dispersion can be suppressed.

  Further, the inner diameter polishing injection port and the outer diameter polishing injection port sandwich a line perpendicular to the moving direction of the inner diameter polishing injection port or the outer diameter polishing injection port and passing through the center of the grindstone. And are preferably arranged on different sides.

  According to this configuration, since the two injection ports are arranged on different sides across the line passing through the center of the grindstone, the two arms can be used even when the grindstone rotates in the same way during the inner diameter grinding and the outer diameter grinding. Can inject coolant from any of the respective injection ports without interfering with each other. In addition, it is possible to bring the inner diameter polishing injection port and the outer diameter polishing injection port closer to the outer peripheral surface of the grindstone as the grindstone becomes smaller by one moving mechanism. Further, a simple power transmission mechanism such as a rack and pinion can be used as the moving mechanism.

Moreover, the first arm, the arm body and has a cylindrical nozzle provided in the arm body, the inner diameter abrasive injection port is Oite the nozzle on the outer peripheral surface of the tubular nozzle It is preferable that the hole is formed outward in the radial direction .

According to this configuration, the inner diameter abrasive jet orifice is a hole formed radially outward of Oite the nozzle on the outer peripheral surface of the tubular nozzle, the area occupied than usual pointed shape of the nozzle It is possible to use a nozzle having a small outer shape. Therefore, even if an inner diameter polishing nozzle is inserted inside the workpiece, it is difficult to interfere with the grindstone and the inner peripheral surface of the workpiece.

  The second arm preferably includes an arm main body and a nozzle that is detachably attached to the arm main body, and the outer diameter polishing injection port is preferably formed in the nozzle.

  According to this structure, the 2nd arm is equipped with the structure where the nozzle in which the injection hole for outer diameter grinding | polishing was formed was attached to the arm main body so that attachment or detachment was possible. Therefore, at the time of inner diameter polishing, the nozzle in which the outer diameter polishing injection port is formed can be removed from the arm body, and interference between the nozzle and the workpiece can be avoided.

  As described above, according to the coolant supply apparatus of the present invention, it is possible to supply coolant in either case of outer diameter polishing or inner diameter polishing with one coolant supply apparatus. This eliminates the need to replace the coolant supply device. As a result, the processing efficiency is greatly improved.

It is a perspective view of the grinding spindle provided with the coolant supply apparatus which concerns on one Embodiment of the coolant supply apparatus of this invention. It is a top view of the coolant supply apparatus and grindstone of FIG. FIG. 3 is an arrow A view of FIG. FIG. 2 is a top view of the coolant supply device, the grindstone, and the workpiece of FIG. 1 during inner diameter polishing. FIG. 2 is a top view of the coolant supply device, the grindstone, and the workpiece of FIG. 1 during outer diameter polishing. It is a top view in the state where the grindstone which shows the positional relationship of the nozzle of FIG. 2 and a grindstone is large. It is a top view in the state where the grindstone which shows the positional relationship of the nozzle of FIG. 2 and a grindstone is small. It is a top view of a state with a large grindstone which shows the positional relationship of the nozzle of FIG. 2 and a grindstone at the time of changing the moving direction of the nozzle of FIG. FIG. 3 is a top view of a small state of the grindstone showing the positional relationship between the nozzle of FIG. 2 and the grindstone when the moving direction of the nozzle of FIG. 2 is changed.

  Hereinafter, an embodiment of a coolant supply device of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 3, the rotation axis R of the grinding spindle G of the automatic machine tool has an inner peripheral surface P1 (see FIGS. 1 and 4) of the workpiece W1 and an outer peripheral surface P2 of the workpiece W2 (see FIG. 5). A disc-shaped grindstone S for polishing is attached.

  A workpiece W1 shown in FIGS. 1 and 4 is a ring-shaped member whose inner peripheral surface P1 is ground, and is a member corresponding to an outer race such as an angular ball bearing or a deep groove ball bearing.

  On the other hand, the workpiece W2 shown in FIG. 5 is a member whose outer peripheral surface P2 is ground, for example, a member corresponding to an inner race such as an angular ball bearing or a deep groove ball bearing.

  Moreover, the grindstone S should just be a grindstone which can grind both the internal peripheral surface P1 of the workpiece | work W, and the outer peripheral surface P2.

  The coolant supply device 1 is attached to the side surface of the grinding spindle G. The coolant supply device 1 supplies a coolant L (coolant) to the grindstone S that rotates during the grinding operation.

  The coolant supply device 1 includes a pair of arms, that is, a first arm 2 and a second arm 3, and a moving mechanism 4 that changes the distance between the first arm 2 and the second arm 3 and the grindstone S. Yes.

  The first arm 2 is an arm used for injecting the coolant L onto the outer peripheral surface of the grindstone S when the grindstone S polishes the inner peripheral surface P1 of the workpiece W. The first arm 2 includes a nozzle 5 and an arm body 6 that supports the nozzle 5. As shown in FIG. 2, the internal passage 5 a of the nozzle 5 communicates with the coolant tank 58 via the internal passage 6 a of the arm body 6, the hose 7, the electromagnetic valve 55 and the pump 57. The nozzle 5 is supplied with the coolant pumped by the pump 57.

  The arm body 6 is disposed above the grindstone S. Therefore, the arm body 6 does not interfere with the grindstone S.

A nozzle 5 is attached to the lower end of the arm body 6. Nozzle 5, a cylindrical extending in the vertical direction of the hole (the so-called transverse hole) formed radially outward of Oite the nozzle 5 to the outer circumferential surface as shown in FIGS. 1-4 and injection port 8 It consists of a pipe. Since the cylindrical nozzle 5 has an outer shape that occupies a smaller area than the nozzle that protrudes in the vicinity of the injection port 8, even if the nozzle 5 is inserted inside the workpiece W, It is difficult to interfere with the inner peripheral surface P1.

  The injection port 8 is formed toward the outer peripheral surface of the grindstone S. The injection port 8 is composed of a vertically long slit. The injection port 8 is formed according to the height of the grindstone S.

  The nozzle 5 is detachably attached to the arm body 6, but may not be detachable from the arm body 6.

  The arm body 6 has a vertical portion 25 extending vertically upward at an end opposite to the end to which the nozzle 5 is attached.

  The second arm 3 is an arm used for injecting coolant onto the grindstone S when the grindstone S polishes the outer peripheral surface P2 of the workpiece W. The second arm 3 includes a nozzle 9 and an arm body 10 that supports the nozzle 9.

The arm body 10 is disposed above the grindstone S. Therefore, the arm body 10
Does not interfere with the grindstone S.

  As shown in FIG. 2, the internal passage 9 a of the nozzle 9 communicates with the coolant tank 58 via the internal passage 10 a of the arm body 10, the hose 11, the electromagnetic valve 56 and the pump 57. The nozzle 9 is supplied with the coolant pumped by the pump 57.

  A nozzle 9 is attached to the lower end of the arm body 10. The nozzle 9 has an elongated plate shape extending in the vertical direction. Two injection ports 13 are formed on the side surface 9b of the nozzle 9 and open toward the inside of the pair of arms 2 and 3 (see FIG. 3). The shape of the nozzle 9 may be cylindrical. The injection port 13 consists of a vertically long slit. The injection port 13 is formed according to the height of the grindstone S.

  The nozzle 9 is detachably attached to the arm main body 10, but may not be detachable from the arm main body 10.

  Further, the arm body 10 has a vertical portion 26 extending vertically upward at an end opposite to the end to which the nozzle 9 is attached.

  The moving mechanism 4 is a mechanism that moves the first arm 2 and the second arm 3 closer to or away from the grindstone S. The moving mechanism 4 includes a main body 20, a motor 21, a pinion gear 22, an upper rack 23 (first rack), and a lower rack 24 (second rack). The first arm 2 is fixed to the upper rack 23 (first rack), and the second arm 3 is fixed to the lower rack 24 (first rack).

  The moving mechanism 4 is disposed above the grindstone S. Therefore, the moving mechanism 4 does not interfere with the grindstone S.

  The motor 21 and the pinion gear 22 are attached inside the main body 20. The motor 21 is driven to rotate in both forward and reverse directions. The pinion gear 22 can be rotated in both forward and reverse directions by driving the motor 21.

  The upper rack 23 and the lower rack 24 are supported so as to be linearly movable with respect to the main body 20, and protrude from both left and right ends of the main body 20.

  The teeth 23a of the upper rack 23 are formed on the lower surface of the upper rack 23 and mesh with the pinion gear 22 from above. One end 23 c of the upper rack 23 is fixed to the vertical portion 25 of the arm body 6. The other end 23b of the upper rack 23 is inserted into the opening 27 of the vertical portion 26 of the arm body 10, and the upper rack 23 is supported horizontally. However, since the upper rack 23 is not fixed to the vertical portion 26 of the arm body 10, the upper rack 23 can move inside the opening 27. A stopper 29 for the vertical portion 26 of the arm body 10 is provided at the end 23 b of the upper rack 23.

  The teeth 24a of the lower rack 24 are formed on the upper surface of the lower rack 24 and mesh with the pinion gear 22 from below. One end 24 c of the lower rack 24 is fixed to the vertical portion 26 of the arm body 10. The other end 24b of the lower rack 24 is inserted through the opening 28 of the vertical portion 25 of the arm body 6, and the lower rack 24 is supported horizontally. However, since the lower rack 24 is not fixed to the vertical portion 25 of the arm body 10, the lower rack 24 can move inside the opening 28. A stopper 30 for the vertical portion 25 of the arm body 6 is provided at the end 24 b of the lower rack 24.

  As shown in FIG. 2, the rotational axis direction J1 of the pinion gear 22 and the moving direction J2 of the upper rack 23 and the lower rack 24 are orthogonal to each other. The movement direction J2 of the upper rack 23 and the lower rack 24 is parallel to the movement direction T3 of the nozzle 5 and the movement direction T1 of the nozzle 9.

  With the configuration of the moving mechanism 4 as described above, as shown in FIG. 3, when the pinion gear 22 rotates in the clockwise direction C1 by driving the motor 21, the upper rack 23 and the first arm 2 advance in the direction D1. On the other hand, the lower rack 24 and the second arm 3 proceed in the direction D2. As a result, the first arm 2 and the second arm 3 move in a direction approaching each other. Thus, the moving mechanism 4 can simultaneously move the first arm 2 and the second arm 3 in a direction approaching each other.

  On the other hand, when the pinion gear 22 rotates counterclockwise C2, the upper rack 23 advances in the direction D2, and the lower rack 24 advances in the direction D1, so that the first arm 2 and the second arm 3 are separated from each other. Move to. Thus, the moving mechanism 4 can simultaneously move the first arm 2 and the second arm 3 in directions away from each other.

  Moreover, the coolant supply apparatus 1 is provided with the switching mechanism 50 which switches the coolant flow path to the pair of arms 2 and 3 as shown in FIG. The switching mechanism 50 includes an electromagnetic valve 55 provided between the pump 57 and the hose 7 on the first arm 2 side, and an electromagnetic valve 56 provided between the pump 57 and the hose 11 on the second arm 3 side. It has. The solenoid valves 55 and 56 are controlled to be opened and closed by the control unit 31, and only one of them can be opened.

  According to the above configuration, as shown in FIGS. 1 to 3, the injection port 8 for inner diameter polishing is formed in one first arm 2 of the pair of arms, and the outer diameter polishing is performed in the other second arm 3. Therefore, when the grindstone S is subjected to inner diameter polishing or outer diameter polishing, the coolant L can be injected from the corresponding first arm 2 or second arm 3. As a result, it is not necessary to replace the coolant supply device when performing inner diameter polishing and outer diameter polishing.

  In addition, since the coolant supply device 1 of the present embodiment includes the moving mechanism 4 capable of moving the pair of arms 2 and 3, the complexity of the structure of the coolant supply device 1 is suppressed, and manufacturing costs and maintenance costs are reduced. Etc. can be reduced.

  Further, as shown in FIG. 2, the inner diameter polishing injection port 8 and the outer diameter polishing injection port 13 are perpendicular to their moving directions T1 and T3 and pass through the center O of the grindstone S. They are arranged on different sides with respect to each other. With this arrangement, even if the rotation direction of the grindstone S is the same during the inner diameter polishing and the outer diameter polishing, the two arms 2 and 3 do not interfere with each other, and the coolant L is injected from either of the injection ports 8 and 13. Is possible.

  In addition, since the moving mechanism 4 moves the first arm 2 and the second arm 3 in the direction in which they move closer to each other, the moving arm 4 moves the first arm 2 and the second arm 3 as the grindstone S becomes smaller. It is possible to approach the outer peripheral surface of the grindstone. Further, since a rack and pinion mechanism is adopted as the moving mechanism 4, the structure of the moving mechanism 4 is simplified.

  In addition to the rack and pinion mechanism, the moving mechanism 4 may use a belt drive mechanism (for example, a reciprocating linear movement mechanism used for an automatic door).

  As shown in FIGS. 1 and 2, the motor 21 of the moving mechanism 4 is controlled by a control unit 31 including a CPU of a control microcomputer. The control unit 31 also controls the solenoid valves 55 and 56 that switch the coolant flow and the grinding spindle moving device 32 that moves the grinding spindle G.

  By using such a control unit 31, it is possible to change the positions of the nozzles 5 and 9 (and the positions of the arms 2 and 3) according to the dressing amount after dressing the grindstone S. Specifically, the grinding spindle moving device 32 moves the grindstone S after the grinding operation to a position of a dresser (not shown) to perform dressing. The dresser cuts the surface of the grindstone S by a predetermined dressing amount. After the dressing grindstone S is moved to a predetermined position, the moving mechanism 4 having a rack and pinion mechanism automatically moves the nozzles 5 and 9 closer to the grindstone S according to the dressing amount. The nozzles 5 and 9 are aligned. Thereby, the positions of the nozzles 5 and 9 can be changed according to the dressing amount.

  Specifically, the positions of the nozzles 5 and 9 with respect to the grindstone S are obtained from the present grindstone diameter dimension values included in the NC control program of the automatic machine tool. That is, since the size of the grindstone S is cut by regular dressing until it reaches a predetermined size, the diameter of the grindstone S after dressing becomes the present grindstone diameter dimension value included in the NC control program. It is possible to accurately position the nozzles 5 and 9 with respect to the grindstone S after dressing based on the present grindstone diameter current dimension value.

(Description of inner diameter polishing)
As shown in FIGS. 1 and 4, when grinding the inner peripheral surface P1 of the workpiece W1, the grindstone S and the cylindrical nozzle 5 of the first arm 2 are disposed inside the workpiece W1.

  At this time, the control unit 31 controls the moving mechanism 4 to move the first arm 2 and the second arm 3, and the position of the nozzle 5 of the first arm 2 is included in the NC control program of the automatic machine tool. The optimum position close to the grindstone S is controlled based on the present grindstone diameter dimension value.

  Next, the control unit 31 opens the electromagnetic valve 55 shown in FIG. 2 and closes the electromagnetic valve 56 to open the coolant flow path on the first arm 2 side, and on the second arm 3 side. Close the flow path. Thereafter, the control unit 31 operates the pump 57 to control the coolant in the coolant tank 58 to be pumped to the nozzle 5 of the first arm 2.

  Thereafter, the grindstone S is rotated in the clockwise direction C1 by the rotational drive by the grinding spindle G, and grinds by contacting the inner peripheral surface P1 of the workpiece W1 at the machining point F1.

  As shown in FIG. 4, since the gap between the grindstone S and the workpiece W1 is narrow at a position slightly away from the processing point F1 inside the workpiece W1, the coolant L is used for the grindstone S and the workpiece W1 during inner diameter polishing. It becomes easy to get caught in between. Therefore, if the coolant L is sprayed from the tangential direction of the grindstone S to the position E close to the spray port 8 on the outer peripheral surface of the grindstone S and the coolant L is sprayed to the position E, the processing point F1 is reached. Coolant can be supplied. In this case, since the injection distance of the coolant L is short, the coolant L is difficult to disperse.

  In this case, since the cylindrical nozzle 5 has an outer shape with a small occupation area, the cylindrical nozzle 5 can be brought close to the grindstone S without interfering with the grindstone S and the workpiece W1. For this reason, the flight distance of the coolant L may be relatively short. Therefore, the diffusion of the coolant L is reduced, and there is no work problem.

  When the inner diameter is polished, it is preferable to remove only the portion of the second arm 3 that easily interferes with the workpiece W1, for example, the nozzle 9.

(Description of outer diameter polishing)
Further, as shown in FIG. 5, when the outer peripheral surface P2 of the workpiece W2 is ground, the grindstone S and the nozzle 9 of the second arm 3 are arranged outside the workpiece W2.

  At this time, the control unit 31 controls the moving mechanism 4 to move the first arm 2 and the second arm 3, and the position of the nozzle 9 of the second arm 3 is included in the NC control program of the automatic machine tool. The optimum position close to the grindstone S is controlled based on the present grindstone diameter dimension value.

  Next, the control unit 31 closes the solenoid valve 55 shown in FIG. 2 and opens the solenoid valve 56 to close the coolant flow path on the first arm 2 side, and on the second arm 3 side. Open the flow path. Thereafter, the controller 31 controls the pump 57 to operate so that the coolant in the coolant tank 58 is pumped to the nozzle 9 of the second arm 2.

  Thereafter, the grindstone S rotates in the clockwise direction C1 by driving the grinding spindle G, and grinds by contacting the outer peripheral surface P2 of the workpiece W2 at the machining point F2.

  In the case of outer diameter polishing, the nozzle 9 of the second arm 3 sprays the coolant L from a position slightly separated from the workpiece W2 and the grindstone S.

  Since the gap between the grindstone S and the workpiece W2 becomes wider at a position slightly away from the processing point F2 outside the workpiece W2, the amount of the coolant L caught between the grindstone S and the workpiece W2 is small during outer diameter polishing. . Therefore, it is necessary to inject the coolant L with the injection port 13 directed directly toward the processing point F2. In this case, the nozzle 9 needs to increase the flight distance of the coolant L as compared with the case of inner diameter polishing.

  When the outer diameter is polished, it is preferable to remove only the portion of the first arm 2 that easily interferes with the workpiece W2, for example, the nozzle 5.

(Explanation of tilting and moving the nozzle 9)
In this embodiment, as shown in FIGS. 2 and 6 to 7, the moving mechanism 4 is configured such that the angle θ <b> 1 formed by the traveling direction T <b> 1 of the nozzle 9 of the second arm 3 and the injection direction of the coolant L is 90 degrees. The pair of arms 2 and 3 are moved so as to be less.

  Specifically, as shown in FIGS. 6 to 7, the nozzle 9 of the second arm 3 controls the outer periphery of the grindstone S with respect to the grindstone S while controlling the movement of the pair of arms 2 and 3 by the moving mechanism 4. It is controlled to move in a direction T1 inclined at an inclination angle θ2 (= 90 ° −θ1) with respect to a line V connecting the processing point F2 where the coolant L hits the surface and the center O of the grindstone S.

  As described above, when the grindstone S is reduced as shown in FIGS. 6 to 7 by dressing or the like, the nozzle 9 is moved while being inclined with respect to the grindstone S while the injection direction of the coolant L is directed toward the processing point F2. The distance between the grindstone S and the nozzle 9 is reduced from δ1 to δ2. As a result, the distance between the injection port 13 of the nozzle 9 and the processing point F2 can be reduced from Y1 to Y2. As a result, the coolant L is difficult to disperse.

  In the present embodiment, the pair of arms 2 and 3 are moved so that the angle between the nozzle 9 of the second arm 3 and the injection direction of the coolant L is less than 90 degrees. It is not limited to this. Also for the nozzle 5 of the first arm 2, the pair of arms 2 and 3 may be moved so that the angle formed by the traveling direction of the nozzle 5 and the coolant injection direction is less than 90 degrees. Also in this case, the distance between the injection port 8 of the nozzle 5 of FIG. 4 and the position E where the coolant L hits can be reduced, and the coolant L is difficult to disperse.

  However, the nozzle 9 of the second arm 3 is arranged farther from the grindstone S than the nozzle 5 of the first arm 2, and the coolant L is easily dispersed. Considering this point, it is preferable that only the nozzle 9 of the second arm 3 is moved while being inclined as described above.

  As shown in FIGS. 8 to 9, it is also conceivable to move the nozzle 9 without tilting it by changing the angle of the injection port 13. In this case, the nozzle 9 is moved in a direction T2 that forms 90 degrees with respect to the injection direction of the coolant L on the outer peripheral surface of the grindstone S while directing the injection direction of the coolant L toward the processing point F2. For this reason, the distance Y3 between the injection port 13 of the nozzle 9 and the processing point F2 where the coolant L hits is always constant regardless of the size of the grindstone S.

  Thus, when the grindstone S is reduced as shown in FIGS. 8 to 9 by dressing or the like, the nozzle 9 is moved to the center O of the grindstone S and the machining point F2 while directing the injection direction of the coolant L toward the machining point F2. , The distance between the grindstone S and the nozzle 9 increases from δ3 to δ4. However, the distance Y3 between the nozzle 13 of the nozzle 9 and the processing point F2 is maintained constant, although the distance Y3 between the nozzle 13 of the nozzle 9 and the processing point F2 can be reduced. Yes.

  Here, if the nozzle 9 is to be brought closer to the processing point F2, the nozzle 9 comes into contact with the grindstone S at a position before the processing point F2. Therefore, when the nozzle 9 is moved without being inclined, it is difficult to bring the nozzle 9 close to the processing point F2 due to the structure, and as a result, it is difficult to suppress the dispersion of the coolant by shortening the injection distance. . Therefore, as described above, if the nozzle 9 is moved so that the angle θ1 between the traveling direction T1 of the nozzle 9 and the injection direction of the coolant L is less than 90 degrees, the injection distance can be reduced without such a problem. It is possible to suppress the dispersion of the coolant by shortening.

DESCRIPTION OF SYMBOLS 1 Coolant supply apparatus 2 1st arm 3 2nd arm 4 Movement mechanism 5 Nozzle 6 Arm main body 7 Hose 8 Injection port 9 Nozzle 10 Arm main body 11 Hose 13 Injection port 20 Main body part 21 Motor 22 Pinion gear 23 Upper rack 24 Lower rack 25 , 26 Vertical portions 27, 28 Openings 29, 30 Retaining stopper 31 Control unit 32 Grinding spindle moving device 50 Switching mechanism 55, 56 Solenoid valve 57 Pump 58 Coolant tank F1, F2 Processing point G Grinding spindle L Coolant P1 Inner peripheral surface P2 Outer periphery Surface R Rotating shaft S Grinding wheel W1, W2 Workpiece

Claims (6)

A coolant supply device that supplies coolant to a grindstone that selectively polishes the inner and outer peripheral surfaces of a workpiece,
With a pair of arms,
The first arm that is one arm of the pair of arms is formed with an inner diameter polishing injection port that injects coolant to the grindstone when the grindstone grinds the inner peripheral surface of the workpiece,
The second arm, which is the other arm of the pair of arms, is formed with an outer diameter polishing injection port for injecting coolant onto the grindstone when the grindstone grinds the outer peripheral surface of the workpiece .
Means for switching between a coolant injection state from the inner diameter polishing injection port and a coolant injection state from the outer diameter polishing injection port;
The coolant supply apparatus characterized by the above-mentioned. A moving mechanism for moving the pair of arms to change the distance between each arm of the pair of arms and the grindstone;
The coolant supply device according to claim 1. In the moving mechanism, an angle formed between a moving direction of the inner diameter polishing injection port or the outer diameter polishing injection port and a coolant injection direction of the inner diameter polishing injection port or the outer diameter polishing injection port is less than 90 degrees. Moving the pair of arms so that
The coolant supply device according to claim 2. The inner diameter polishing injection port and the outer diameter polishing injection port are orthogonal to the moving direction of the inner diameter polishing injection port and the outer diameter polishing injection port and sandwich each other across a line passing through the center of the grindstone. Located on different sides,
The coolant supply apparatus in any one of Claim 1 to 3. The first arm includes an arm main body and a cylindrical nozzle provided on the arm main body,
The inner diameter of the polishing injection port is a hole formed radially outward of Oite the nozzle on the outer peripheral surface of the tubular nozzle,
The coolant supply apparatus in any one of Claim 1 to 4. The second arm includes an arm body and a nozzle that is detachably attached to the arm body.
The outer diameter polishing injection port is formed in the nozzle,
The coolant supply apparatus in any one of Claim 1 to 5.

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