JP5267046B2 - Coolant supply system and grinding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coolant supply system having high heat removal performance with low cost and simple construction. <P>SOLUTION: In the coolant supply system in a grinder 1 for grinding a workpiece W by relatively moving a magnet G and the workpiece W while supplying coolant to a grinding point P by the magnet G, the coolant supplied to the grinding point P by a first coolant supply device 37 constituting the coolant supply system 5 is superheated vapor obtained by heating saturated vapor to a predetermined temperature. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to supply of coolant to a contact portion between a grindstone and a workpiece in a grinding apparatus for grinding a workpiece with a grindstone.

Conventionally, in a grinding apparatus that grinds a workpiece with a grindstone, cooling and lubrication of the workpiece, the grindstone, and a grinding point (contact point) are performed by spraying a coolant liquid. However, it is not easy to sufficiently distribute the coolant liquid to a workpiece or a grindstone that rotates at high speed, or to a grinding point where the workpiece and the grindstone contact each other, and various methods are employed, for example, as shown in Patent Document 1 It has been known. According to Patent Document 1, in order to supply the coolant liquid to the grinding point, a fine turbulent mass generating device 3 is provided. By spraying supply. The finely agglomerated coolant liquid adheres to the workpiece, grinding wheel and grinding point as a thin film due to the action of fine turbulence. Stable cooling and lubrication effect.
WO2003 / 076129

  However, in the coolant supply method shown in Patent Document 1, since the liquid phase coolant is atomized, there is a limit to the minimum size of the particles, and it is difficult for the coolant liquid to enter the deep part of the grinding point. Therefore, the grinding heat at the grinding point cannot be sufficiently removed, and there is a risk that a grinding burn problem will occur. Also, since the grinding heat cannot be removed sufficiently, it is difficult to increase the grinding speed from the current level, and it is difficult to expect an improvement in productivity. Furthermore, since the coolant liquid is reused, abrasive grains and chips mixed in the coolant liquid may enter the grinding point and reduce the processing accuracy, and the use of a large amount of coolant liquid is indispensable. There is also a problem that it becomes excessive and the space of equipment becomes large and the cost becomes high.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a coolant supply system having a high heat removal performance with a low-cost and simple configuration.

  In order to solve the above-mentioned problem, the structural feature of the invention according to claim 1 is that the grinding wheel and the workpiece are relatively moved, and the workpiece is ground while supplying coolant to the grinding point by the grinding stone. In the coolant supply system in the grinding device, the coolant supplied to the grinding point by the first coolant supply device that constitutes the coolant supply system is superheated steam obtained by heating saturated steam to a predetermined temperature.

  A structural feature of the invention according to claim 2 is that, in claim 1, the coolant supply system is a liquid for removing chips generated from the workpiece during the grinding and for cooling the workpiece. A second coolant supply device for supplying the above-mentioned grinding fluid.

  The structural feature of the invention according to claim 3 is that, in claim 2, the grindstone in the grinding device is supported by a grindstone table so as to be rotationally driven, and the workpiece is supported by a workpiece support device so as to be rotationally driven. The coolant nozzle of the first coolant supply device is disposed above the grinding point, the coolant is sprayed to the grinding point below from the upstream side in the grindstone rotation direction, and the coolant nozzle of the second coolant supply device is the work tool. The grinding liquid is disposed below the workpiece and the grindstone, and is sprayed onto the workpiece and the grindstone above from the downstream side in the grindstone rotation direction.

  According to a fourth aspect of the present invention, there is provided a grinding device for grinding the workpiece by the grindstone by moving the grindstone and the workpiece relative to each other, according to any one of the first to third aspects. The described coolant supply system is provided.

  According to the first aspect of the invention configured as described above, the coolant of the first coolant supply device supplied to cool the grinding point is superheated steam that has been heated to a predetermined temperature. As a result, although superheated steam is sprayed from the nozzle and cooled in the air to form water droplets, water droplets with a smaller particle size than those obtained by atomization from water in the liquid phase can be obtained, thus reaching deep into the grinding point. The grinding point can be reliably cooled. Cooling is not sensible heat cooling in which the coolant is used in the liquid state, but latent heat cooling that takes away the latent heat when vaporizing from the grinding point, so the cooling effect is very large and can be handled with a small amount of coolant (water vapor) . Furthermore, since the cooling effect is great, the processing speed can be increased and the productivity is improved.

  According to the invention according to claim 2 configured as described above, the second coolant supply device for supplying the liquid grinding fluid is provided, and the grinding fluid is mainly used for the removal (cleaning) of chips and falling abrasive grains. Is done. Therefore, compared to the conventional method, the amount of grinding fluid used is greatly reduced as the grinding point is not cooled, the coolant tank for storing the grinding fluid can be made smaller, and the equipment space is reduced, thereby reducing costs. be able to.

  According to the invention according to claim 3 configured as described above, the coolant nozzle of the first coolant supply device is disposed above the grinding point, and the coolant which is superheated steam is sprayed from the upstream side in the grinding wheel rotation direction toward the grinding point. The coolant nozzle of the second coolant supply device is disposed below the workpiece and the grindstone, and liquid grinding fluid is sprayed onto the workpiece and the grindstone from the downstream side in the grindstone rotation direction. Thereby, the coolant sprayed from the first coolant supply device easily reaches the grinding point, and the cooling effect of the grinding point is enhanced. The grinding fluid sprayed from the second coolant supply device removes chips and falling abrasive grains, but since it is difficult to reach the grinding point, foreign matter such as chips mixed in the grinding fluid is at the grinding point. It is possible to prevent the surface from being scratched.

  According to the invention according to claim 4 configured as described above, the coolant supply system according to any one of claims 1 to 3 is provided in the grinding device. As a result, a grinding apparatus that has high heat removal performance with a simple configuration, can grind a workpiece with low cost and high quality, and can improve productivity is obtained.

Hereinafter, the grinding apparatus 1 according to the embodiment of the present invention.
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Based on As shown in FIG. 1, a grinding apparatus 1 includes a bed 10, a grindstone base 11 slidably mounted on the bed 10 and moved forward and backward in the X-axis direction by a servo motor 12 via a ball screw mechanism, And a table 17 that is slidably mounted on the table 17 and is moved in the Y-axis direction perpendicular to the X-axis by the servo motor 14 via the ball screw mechanism 18, and a workpiece W mounted on the table 17 so as to sandwich and rotate the workpiece W. The spindle 20 and the tailstock constituting the workpiece support device 19 and the surrounding air layers 30 and 33 generated on the outer surface of the grindstone G when the grindstone G rotates at a high speed are shut off by air injection to provide coolant. A fluid jet discharge device 24 for allowing the grinding point P to reach the grinding point P smoothly, and a coolant supply system 5 for cooling the grinding point P, removing chips and cooling the workpiece, etc. It is configured me.

  A grindstone shaft 13 having a grindstone G attached to the tip is supported on the grindstone base 11 so as to be rotationally driven. The grindstone G is composed of a plurality of grindstone chips 16 bonded to the outer peripheral surface of a disk-shaped base 15 formed of a metal such as iron or aluminum, and is driven to rotate by a motor. A grindstone cover 22 that covers the grindstone G is fixed to the grindstone base 11 as shown in FIGS. A windshield plate 31 is attached to the grindstone cover 22, and an air cut nozzle 25a for the side surface of the fluid jet discharge device 24 that opens obliquely downward toward the front end portions of both side surfaces 23a, 23b of the grindstone G on the windshield plate 31. 25b are attached. A wind shielding plate 31 is arranged in parallel to the string 28 from the upstream side in the direction of rotation of the grindstone from the grinding point P on the rotation center side of the grindstone G slightly from the vertical string 28 of the small circular arc portion 27 of the grindstone G. 11 is attached to a grindstone cover 22 fixed to 11. An opening groove 32 is formed in the wind shield plate 31, and both side surfaces 32 a and 32 b of the opening groove 32 face the both side surfaces 23 a and 23 b of the grindstone G with a slight gap, and cross the grindstone radius including the grinding point P. It extends to the position. The groove end surface 32c of the opening groove 32 has an outer peripheral surface of the grindstone G on the upstream side of the grinding wheel rotation direction from the grinding point P in order to block the air layer 33 that rotates around the grindstone outer peripheral surface 23c from reaching the grinding point P. It is opposed with a slight gap.

  The coolant supply system 5 performs a first coolant supply device 37 for supplying coolant in a superheated steam state for cooling the grinding point P to the grinding point P, and for removing chips and abrasive grains and cooling the workpiece. And a second coolant supply device 6 for supplying a liquid grinding fluid.

  The first coolant supply device 37 uses a water tank 43 that stores water, a pipe 41 that has one end connected to the water tank 43 and circulates water, and a water that is circulated and connected to the other end of the pipe 41. A heater unit 40 that generates and delivers superheated steam at a temperature, and a coolant nozzle 38 that is connected to the outlet of the superheated steam generated by the heater unit 40 and sprays the superheated steam toward the grinding point P of the workpiece W below. And a water feed pump 42 that is provided on the pipe 41 and pumps the water stored in the water tank 43 to the heater section 40 through the pipe 41. In addition, superheated steam means here the water vapor | steam heated and heated to the temperature exceeding 100 degreeC.

  The water tank 43 is formed of, for example, water-resistant resin (polyamide or the like) or metal (rust-proof iron or the like), and is housed in a rack 34 formed by bending an iron plate below the grinding device 1. ing. The water tank 43 is provided with a water supply port (not shown) so that tap water can be replenished from the outside.

  The heater unit 40 is brought into contact with an evaporator 40a that boiles the water circulated through the pipe 41 by the heater 52 and generates saturated steam at 100 ° C., and the heater 51 that is heated to 700 ° C. for example. The superheated steam generation unit 40b that instantaneously heats and causes steam explosion to atomize the particle size of the steam to 2 nm or less, for example, and the blower fan 50 for sending out the generated superheated steam.

  The evaporating unit 40a is configured by, for example, a metal case 45 formed to be airtight and watertight. The case 45 forms a water storage portion 45a in which water supplied from the water tank 43 is stored up to a predetermined height h below, and the generated 100 ° C. saturated steam is above the water storage portion 45a. A saturated water vapor storage part 45b to be stored is formed. The water reservoir 45a is provided with a heater 52 for boiling water. The heater 52 is buried in the supplied and stored water and directly contacts the water to exchange heat and heat the water. The evaporation unit 40a is connected to and communicated with the superheated steam generation unit 40b through the upper connection unit 46. The connecting part 46 is located in the saturated water vapor storage part 45b of the case 45 of the evaporation part 40a. When the inside of the saturated water vapor storage part 45b is raised to a predetermined pressure, the saturated water vapor flows into the superheated steam generation part 40b. It is comprised by the relief valve set to the valve opening pressure.

  The superheated steam generator 40b is configured by a case 47 that is formed airtight. A blower fan 50 for delivering the generated superheated steam is disposed in the case 47 above the connecting portion 46 with the evaporator 40a. Further, the heater 51 for instantaneously heating the saturated steam supplied from the evaporator 40a below the connecting part 46 to the evaporator 40a on the surface of high temperature (for example, 700 ° C.) to generate superheated steam at 200 ° C., for example. Is provided. An outlet 47a for the generated superheated steam is formed below the heater 51 and below the case 47, and is connected to and communicated with the coolant nozzle 38. In addition, a commercially available superheated steam generator may be used for the heater part 40, and what kind of apparatus may be used if the superheated steam of desired temperature is obtained.

  The coolant nozzle 38 has a tube shape and is heat resistant because superheated steam exceeding 200 ° C. passes through the inside, and is formed of, for example, polyimide resin having high heat insulating properties so as not to lower the temperature of the superheated steam. The coolant nozzle 38 is disposed above the grinding point P. The coolant nozzle 38 is fixed to the grindstone cover 22 fixed to the grindstone base 11, the injection port 38a is opened downward, and superheated steam as coolant is sprayed and supplied to the grinding point P. The jet nozzle 38a of the coolant nozzle 38 and the grinding point P are spaced apart by a predetermined distance. Here, the predetermined distance means an optimum distance for efficiently cooling the grinding point P. Specifically, as shown in FIG. 2, superheated steam sprayed from the outlet 38a of the coolant nozzle 38 is formed. It is best to set the distance to water droplets immediately before reaching the grinding point P after being cooled in air.

  The second coolant supply device 6 is for cleaning the chips discharged mainly from the workpiece W and the abrasive grains falling off from the grindstone G and cooling the workpiece W and the grindstone G with a liquid grinding fluid. is there. The second coolant supply device 6 includes a coolant tank 49 that collects and stores the grinding fluid, a pipe 44 that is connected at one end to the coolant tank 49 and through which the grinding fluid flows, and is connected to the other end of the pipe 44 and is connected to the grindstone G and the workpiece W. A coolant nozzle 39 for spraying and supplying the grinding liquid toward the surface, and a liquid feed pump 48 for feeding the grinding liquid stored in the coolant tank 49 provided on the pipe 44 to the coolant nozzle 39 via the pipe 44; It is composed of

  The coolant tank 49 is formed of an oil-resistant resin (for example, polyamide) or metal (for example, rust-proof iron), and is disposed on the floor surface on which the grinding apparatus 1 is installed.

  The coolant nozzle 39 has a tubular shape and is formed of an oil-resistant resin (for example, polyamide) or metal (for example, iron subjected to rust prevention treatment), and a slightly high-pressure grinding fluid flows through the inside. The coolant nozzle 39 is fixed to the bed 10 via a bracket (not shown). The coolant nozzle 39 is arranged below the workpiece W and the grindstone G, the injection port 39a is opened upward, and the grinding liquid is arranged to be sprayed and supplied to the grindstone G and the workpiece W.

  Next, the operation of the present embodiment configured as described above will be described. First, when the grinding apparatus 1 is turned on and the machining is started, the workpiece W sandwiched between both centers of the headstock 20 and the tailstock is rotated. Next, the grindstone base 11 is advanced by the rotation of the servo motor 12 in a predetermined direction, and the grindstone G rotated at a high speed and the workpiece W supported by the workpiece support device 19 are moved relative to each other so that the workpiece W becomes the grindstone. G is ground.

  At this time, at the grinding point P of the workpiece W, heat is generated by friction between the grindstone G and the workpiece W, chips are generated from the workpiece W, and abrasive grains fall off from the grindstone G. If the heat generated by the friction is left without being removed, the grinding point P of the workpiece W rises in temperature, reacts with oxygen in the atmosphere to form an oxide film, and so-called grinding burn occurs. The grinding burn not only deteriorates the appearance but also changes the properties of the base material of the workpiece W, and affects the strength of the base material. Further, the chips generated from the workpiece W and the abrasive grains falling off from the grindstone G affect the processing accuracy of the workpiece W or cause clogging of the grindstone G. Further, the clogging of the grindstone G causes an increase in grinding resistance with the workpiece W, and further increases the temperature of the grinding point P due to frictional heat.

  Therefore, for the removal (cleaning) of the chips generated from the workpiece W and the abrasive grains falling from the grindstone G and the cooling of the workpiece W and the grindstone G, it is general from below the grinding point P (downstream side of the grindstone rotation direction). Machining is performed while supplying a grinding fluid to the workpiece W and the grindstone G by the second coolant supply device 6. That is, the grinding liquid stored in the coolant tank 49 is pumped up by the operation of the liquid feed pump 48 and is pumped to the coolant nozzle 39 via the pipe 44. The grinding fluid supplied to the coolant nozzle 39 is sprayed and supplied toward the workpiece W and the grindstone G above from the jet nozzle 39a of the coolant nozzle 39 opened upward. Thereby, the chips generated from the workpiece W and the abrasive grains dropped from the grindstone G are washed and removed, and the workpiece W and the grindstone G are cooled, so that the machining surface of the workpiece W can maintain high accuracy. At the same time, the grindstone G is prevented from clogging, and there is no fear of an increase in grinding resistance due to clogging of the grindstone G. After that, a filter for trapping impurities further passes through a collection groove (not shown) on the bed 10 in which the grinding fluid for cleaning the chips and abrasive grains is engraved at the position where the chips and abrasive grains are naturally dropped together with gravity. After that, chips and abrasive grains are removed and collected in the coolant tank 49. The grinding fluid collected in the coolant tank 49 is pumped up again by the operation of the liquid feed pump 48 and reused as grinding fluid by the second coolant supply device 6.

  Since the second coolant supply device 6 is mainly intended for cleaning the generated chips and falling abrasive grains, it does not require a large amount of grinding fluid as compared with the conventional technique that also serves to cool the grinding point P. Therefore, the coolant tank 49 can also be reduced in size, and the installation space can be reduced. Further, since the grinding fluid is sprayed from below the grinding point P (downstream of the grinding wheel rotation direction) toward the workpiece W and the grinding wheel G, the spraying is performed from the direction opposite to the rotational direction of the grinding wheel G. Even if foreign matter such as chips is mixed in the liquid, there is a low risk of biting into the grinding point P.

  Next, cooling of the grinding heat generated at the grinding point P will be described. In the present invention, for example, superheated steam at 200 ° C. is supplied to the grinding point P by the first coolant supply device 37 constituting the coolant supply system 5 and cooled. However, there is a problem that accompanying air layers 30 and 33 are generated around the grindstone G that is rotated at a high speed and the coolant is prevented from being supplied to the grinding point P. Therefore, a measure provided in the present embodiment in order to shut off the accompanying air layers 30 and 33 will be briefly described.

  First, the accompanying air layer 33 generated on the outer peripheral portion 23 c of the grindstone G is blocked by both side surfaces 32 a and 32 b and the groove end surface 32 c of the opening groove 32 of the wind shielding plate 31. Thereby, the accompanying air layer 33 cannot reach the grinding point P, and the coolant is not prevented from being supplied to the grinding point P. Next, with respect to the accompanying air layer 30 flowing from the center part of the grindstone G generated on the both side surfaces 23a and 23b of the grindstone G toward the outer peripheral part, the air cut nozzles 25a and 25b of the fluid jet discharge device 24 are connected to the both side surfaces 23a and 23b. It cuts off by injecting air from air cut nozzles 25a and 25b. As shown in FIGS. 1 and 2, air jets 29 are sprayed from the air cut nozzles 25 a and 25 b to the both side surfaces 23 a and 23 b of the grindstone G, respectively. It flows along the chord 28 of the small circular arc portion 27 in front of the grindstone including the grinding point P from the point 26 on the outer peripheral edge of the grindstone on the upstream side in the rotation direction. Further, the side nozzles 25a and 25b are opened in order to prevent the air jet 29 sprayed from the side nozzles 25a and 25b from flowing toward the grinding point P along the side surfaces 23a and 23b. The part is attached to be inclined slightly rearward so that the part faces the rear of the grindstone G. As a result, the grindstone air layer 30 flowing along with the rotation of the grindstone G is blocked from flowing into the small arc portion 27, so that the coolant is not supplied to the grinding point P and the coolant is supplied to the grinding point P. Will not be disturbed.

  Next, the operation of the first coolant supply device 37 will be described. First, the water stored in the water tank 43 is pumped up by the operation of the water supply pump 42 and supplied to the heater unit 40 through the pipe 41. The water supplied to the evaporation unit 40a of the heater unit 40 is stored in the water storage unit 45a of the evaporation unit 40a. And the water stored by the action | operation of the heater 52 arrange | positioned at the water storage part 45a boils, a saturated water vapor | steam is produced | generated, and is stored in the saturated water vapor storage part 45b above the water storage part 45a. When the amount of saturated water vapor stored in the saturated water vapor storage unit 45b increases, the pressure in the saturated water vapor storage unit 45b rises to a predetermined value or more, and the connecting unit 46 includes a relief valve that is set to open at a predetermined pressure. Is sent to the superheated steam generator 40b. The sent saturated steam is sent to the lower part in the superheated steam generating part 40b by the operation of the blower fan arranged above the connecting part 46 in the superheated steam generating part 40b. Saturated water vapor sent downward passes through a heater 51 part, for example, heated to 700 ° C. disposed below the connecting part 46 and is instantaneously heated at a high temperature to cause a water vapor explosion to increase the volume to about 1000 times or more. Inflate. And the superheated steam by which the particle size was atomized to 2 nm or less by expansion | swelling is produced | generated. The temperature of the superheated steam at this time can be set to a desired temperature by controlling the pressure of the evaporator 40a by a predetermined method, for example, 200 ° C. or more. The atomized superheated steam is sent to the coolant nozzle 38 connected to the outlet portion 47a of the heater section 40 by the operation of the blower fan 50, and sprayed from the outlet 38a of the coolant nozzle 38 toward the grinding point P. Supplied.

  The superheated steam ejected from the ejection port 38a of the coolant nozzle 38 comes into contact with the atmosphere and the temperature decreases by a predetermined amount. However, as shown in FIG. 2, even in this state, the superheated steam is at a temperature exceeding 100 ° C., so it is atomized compared to the state of saturated steam at 100 ° C. (superheated steam region). The superheated steam further approaches the grinding point P and is heat-exchanged with the atmosphere to form atomized water droplets having a particle size smaller than that of water droplets but atomized from liquid phase water. Reach deep inside (atomized water droplet region). At this time, the temperature of the grinding point P is, for example, 900 ° C. to 1000 ° C., and the atomized water droplet is vaporized again at the moment when it reaches the deep part of the grinding point P, and cools by removing the latent heat of 2257 kJ / kg from the grinding point. In the case of sensible heat cooling in the liquid phase state, it takes only 4.18 kJ / kg of heat at 20 ° C and cools, so the latent heat cooling is about 540 times the cooling performance of sensible heat cooling and is reliable and quick with a small amount of coolant. In addition, cooling can be performed with high efficiency and the occurrence of grinding burn can be prevented.

  As is clear from the above description, in the present embodiment, the first coolant supply device 37 reliably sprays the superheated steam heated to, for example, 200 ° C. or more to the deep part of the grinding point P of the workpiece W. Attached and supplied, the grinding point P is cooled, and the occurrence of grinding burn is prevented. Further, since the cooling performance is improved by the latent heat cooling, the processing speed can be increased and the productivity can be improved. Further, since the second coolant supply device 6 does not need to cool the grinding point P, the amount of grinding fluid to be used can be reduced, and the coolant tank can be reduced in size and the processing device such as a magnetic separator for the grinding fluid can be reduced. The cost can be greatly reduced. Further, since the amount of used grinding fluid by the second coolant supply device 6 is reduced, the concentration control of the grinding fluid is facilitated, and the quality of the workpiece is improved.

  In the present embodiment, the second coolant supply device 6 sprays the grinding fluid from below the grinding point P (downstream in the grinding wheel rotation direction) toward the workpiece W and the grinding stone G. Even if foreign matter such as powder is mixed, the possibility of reaching the grinding point P and damaging the surface of the workpiece is low, and the quality can be improved.

  In addition, although this embodiment demonstrated the cylindrical grinder, it is applicable not only to this but other grinders, such as a surface grinder, and can anticipate the effect similar to this embodiment.

It is the side view which made some cross sections the grinding device provided with the coolant supply system concerning this embodiment. FIG. 2 is a part of the front view of FIG. 1 and shows a state of superheated steam injected from a first coolant supply device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Grinding device, 5 ... Coolant supply system, 6 ... 2nd coolant supply device, 10 ... Bed, 11 ... Grinding wheel base, 12, 14 ... Servo motor, 13 ... Grinding wheel shaft, 17 ... Table, 20 ... Main head stock, 22 ... Wheel cover, 23a, 23b ... Both sides of the grindstone, 24 ... Fluid jet discharge device, 25a, 25b ... Nozzle for side face, 30,33 ... Air layer accompanying the grindstone, 31 ... Wind shield, 32 ... Opening groove, 37 ... 1st coolant supply device, 38 ... 1st coolant nozzle, 39 ... 2nd coolant nozzle, 40 ... Heater part, 40a ... Evaporation part, 40b ... Superheated steam production | generation part, 41, 44 ... Pipe, 42 ... Water supply pump, 43 DESCRIPTION OF SYMBOLS ... Water tank, 48 ... Liquid feed pump, 49 ... Coolant tank, 50 ... Fan for ventilation, 51, 52 ... Heater, G ... Grinding wheel, P ... Grinding point, W ... Workpiece.

Claims (4)

In a coolant supply system in a grinding apparatus that relatively moves a grindstone and a workpiece and grinds the workpiece while supplying coolant to a grinding point by the grindstone,
The coolant supply system, wherein the coolant supplied to the grinding point by the first coolant supply device constituting the coolant supply system is superheated steam obtained by heating saturated steam to a predetermined temperature.   2. The coolant supply system according to claim 1, wherein the coolant supply system further includes a second coolant supply device that supplies a liquid grinding fluid for removing chips generated from the workpiece during the grinding process and for cooling the workpiece. 3. A coolant supply system comprising:   3. The grinding wheel according to claim 2, wherein the grindstone in the grinding device is rotatably supported on a grindstone table, the workpiece is supported by a workpiece support device in a rotationally driveable manner, and the coolant nozzle of the first coolant supply device is the grinding wheel. The coolant is sprayed onto the grinding point from the upstream side of the grinding wheel rotation direction, the coolant nozzle of the second coolant supply device is disposed below the workpiece and the grinding stone, and the grinding liquid is disposed on the grinding wheel. A coolant supply system which is sprayed onto the workpiece and the grindstone from the downstream side in the rotation direction. In a grinding apparatus that relatively moves a grindstone and a workpiece to grind the workpiece with the grindstone,
A grinding apparatus provided with the coolant supply system according to any one of claims 1 to 3.

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