JPH11170171A - Cold blast grinding device and cold blast grinding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of the peeling of a grinding wheel layer and the crack of a grinding wheel due to the local cooling and contraction of the grinding wheel caused by a continuous supply of a cold blast to the grinding wheel during the stoppage of the grinding wheel for an operational preparation and the changing of setting up, and to prevent that a lubricating oil collects on a table and a bed due to the continuous supply of the lubricating oil during stoppage of the grinding wheel to cause an adherence of chips to the lubricating oil for resulting in the oil unsuitable for recycling, in a cold blast grinding device for supplying a cold blast to cool a ground spot for processing. SOLUTION: A pipe 17 between a cold blast supply device 20 and a cold blast nozzle 19 and a pipe 31 between a lubricating oil supply device 33 and a lubricating nozzle 32 are severally provided with electromagnetic switching valves 55, 34, and a cold blast cooled below 0 deg.C is supplied (A port) through the nozzle 32 and stopped (B port) according to the rotation and stoppage of the grinding wheel, and the lubricating oil is supplied (A', port) and stopped (B' port) at every time of the start and end of a processing cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold air grinding apparatus and a cold air grinding method for performing a grinding process by cooling a processing location using cold air.

[0002]

2. Description of the Related Art Conventionally, a cold air grinding apparatus of this type has been disclosed in Japanese Patent Laid-Open No. 52-120490.
Grinding of rubber roll of JP-164779, JP-A-1-153
257 grinding of ceramics. Further, in the grinding of metal products, since the material is harder than the above materials (rock core, rubber roll) and has a larger linear expansion coefficient than ceramics, the calorific value generated by grinding increases, and the heat is generated so that the workpiece thermally expands. Since the finished dimensions are deviated, the grinding is performed by supplying cold air at a low temperature of 0 ° C. or less, preferably −30 ° C.

In the cold air grinding process, the cooling effect is smaller than that of the conventional coolant cooling. Therefore, lubricating oil is supplied to a grinding portion or a grinding wheel in order to improve lubricity and prevent grinding burn. I have.

[0004]

In the above-mentioned conventional technique, particularly in the cold air grinding of metal products, after a cold air supply device for supplying cold air is started, a stable desired temperature (for example, -30.degree. C.) is reached. Takes time. Therefore, in order to perform the grinding efficiently, it is necessary to always supply the cool air from the cool air supply device after the start of the cool air supply device.

However, during the preparatory operation from the start of the grinding machine to the start of the grinding, in particular, until stable cold air is supplied from the above-described cold air supply device, or during setup change, manual operation is required. When the workpiece is not machined, such as when the workpiece is replaced, or when the worker leaves one end for a break, the wheel is normally stopped from the viewpoint of safety. However, since the cold air supply device is always started for the above-described reason, cold air as low as −30 ° C. is continuously supplied to the grinding portion of the stopped grinding wheel. This causes thermal shrinkage in that part, causing the grinding wheel to become unbalanced, greatly affecting the processing accuracy, and further causing the grinding wheel to separate and crack, thereby shortening the life of the grinding wheel. Was.

Further, when lubricating oil injected to a grinding point or a grinding wheel is supplied at the same timing as cold air to prevent grinding burn, etc., and the supply is stopped, continuous processing is performed without stopping the rotation of the grinding wheel. In this case, since the lubricating oil is constantly supplied even during non-machining such as a change of a workpiece, a lubricating oil pool is formed on a table or a bed. Further, there is a problem in that chips adhered to the oil sump become chips unsuitable for recycling even in the case of coolant-free cold air grinding with a sharp angle.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and a first aspect of the present invention is directed to a grindstone table which moves relative to a workpiece, and a rotation of the grindstone table. A grinding wheel for supporting and grinding the workpiece by the relative movement of the grinding wheel head, a nozzle provided on the grinding wheel head and opening toward a grinding point of the grinding wheel, and a temperature of 0 ° C. or lower through the nozzle. A cool air supply device for supplying cooled air, a control device for controlling the rotation of the grinding wheel, and a supply of cold air to a grinding portion of the grinding wheel in accordance with the rotation / stop control of the grinding wheel by the control device. The cooling air supply control means is provided, wherein the cold air supply control means comprises a supply switching control valve provided between the cold air supply device and the nozzle. The ones
The cold air supply control means comprises nozzle moving means for moving the nozzle to move in the opening direction.

Further, in the present invention, the cooling air is supplied to the grinding portion while the grinding wheel is rotating, and the supply of the cool air to the grinding portion is stopped while the rotation of the grinding wheel is stopped. It is. Claim 5 provides a whetstone table which moves relative to the workpiece, a grinding wheel which rotatably supports the whetstone table and grinds the workpiece by the relative movement of the whetstone table, and is provided on the whetstone table. A cold air nozzle opened toward a grinding point of the grinding wheel, a lubrication nozzle provided on the grinding wheel base and opened toward the grinding point or the grinding wheel, and air cooled to 0 ° C. or lower through the cold air nozzle. A cold air supply device, a lubricating oil supply device for supplying lubricating oil to a grinding point or a grinding wheel surface via the lubrication nozzle, a control device for controlling rotation of the grinding wheel, and a grinding wheel by the control device. It is provided with a lubricating oil supply control means for controlling the supply of lubricating oil to a grinding point or a grinding wheel according to the rotation / stop control.

[0009] According to a sixth aspect of the present invention, there is provided a grindstone table which relatively moves with respect to a workpiece, a grinding wheel which is rotatably supported on the grinding table and grinds the workpiece by the relative movement of the grinding table, and the grinding wheel. A cold air nozzle provided on the table and opened toward the grinding point of the grinding wheel, a lubrication nozzle provided on the grinding table and opened toward the grinding point or the grinding wheel, and a temperature of 0 ° C. or lower through the cold air nozzle. A cool air supply device for supplying cooled air, a lubrication oil supply device for supplying lubricating oil to a grinding point or a grinding wheel via the lubrication nozzle, a control device for controlling rotation of the grinding wheel, and the control device A lubricating oil supply control means is provided for controlling the supply of lubricating oil to a grinding location or a grinding wheel in accordance with the start / stop of a machining process and a grinding wheel correction cycle.

According to a seventh aspect of the present invention, the lubricating oil supply control means comprises a supply switching control valve provided between the lubricating oil supply device and the lubricating nozzle. Cold air grinding machine. Furthermore, when the grinding wheel is rotatably supported on the workpiece by relatively moving the grinding wheel base rotatably supported on the workpiece, a grinding point or a surface of the grinding wheel is provided. A lubricating oil is supplied, and in a cold air grinding processing apparatus for supplying cold air to a grinding portion, the cooling wheel is controlled to supply cold air toward the grinding portion only while the grinding wheel is rotating, and machining of a workpiece by the grinding wheel is performed. Control is performed so that lubricating oil is supplied toward the grinding location or the surface of the grinding wheel only during and during wheel grinding.

[0011]

Embodiments of the present invention will be described with reference to the drawings. A table 5 which is moved in the front-rear direction of the drawing by a ball screw mechanism 3 is mounted on the bed 1, and the main shaft 7 is rotatably driven by a motor (not shown) on the table 5. A headstock 9 and a tailstock (not shown) facing the headstock 9 are supported on the table 5 so as to be able to advance and retreat. A workpiece W is supported between the main shaft 7 and the tailstock via a center or the like, and the workpiece W is rotationally driven by a chuck fixed to an end surface of the main shaft 7 or a center which is rotationally driven together with the main shaft 7.

On the bed 1, there is provided a grindstone table 15 which is moved back and forth by a servomotor 11 in the horizontal direction of the drawing perpendicular to the direction of movement of the table 5.
A grinding wheel 13 that is rotationally driven by a drive motor 16 is supported on the wheel. The workpiece W is ground by controlling the movement of the table 5 in the front-rear direction and the left-right direction of the grinding wheel base 15, the rotation of the main shaft 7, and the rotation of the grinding wheel 13 by the numerical controller 50.

On the bed 1 or outside the machine, there is provided a cool air supply device 20 for cooling the installed air and supplying cool air, and a pipe 17 connected to the cool air supply device 20 is connected to the grindstone table 15. It is provided in. At the tip of the pipe 17, a nozzle 19 opened toward a grinding point P where the grinding wheel 13 and the workpiece W come into contact is fixed. The cool air supply device 20 is a compressor that compresses air, an air tank that stores compressed air from the compressor and suppresses pulsation of the compressor to maintain a constant flow rate, and cools by lowering the dew point of air from the air tank. An air dryer and a heat exchanger that cools the air from the air dryer to, for example, -30 ° C. are activated and supply cold air to the pipe 17 based on a command from a sequence control device 54 described later.

An electromagnetic switching valve 55 serving as a cool air supply control means is provided in the pipe 17 between the cold air supply device 20 and the nozzle 19, and the electromagnetic switching valve 55 is controlled based on a command from the sequence control device 54. The switching of the supply of the cool air sent from the cool air supply device 20 to the A port on the nozzle 19 side and the B port on the drain side is performed. In addition,
The B port may be discharged out of the apparatus as it is, but it is preferable to return the B port to the inlet of the cool air supply device 20 through a filter from the viewpoint of the working environment and the improvement of the cooling efficiency.

Numeral 50 denotes a numerical controller, which is connected to the servomotor 11 via a drive circuit 52 and also to a sequence controller 54. The sequence control device 54 is connected to the drive motor 16 that rotationally drives the grinding wheel 13, the cool air supply device 20, and the electromagnetic switching valve 55.

Next, the operation of the above configuration will be described. When the start start button or the preparatory operation start button is pressed, the numerical controller 50 starts the cool air supply device 20 via the sequence controller 54, and at the same time, the electromagnetic switching valve 55
To switch the connection with the cool air supply device 20 to the B port, that is, the drain side.

After a lapse of time (about 20 minutes) during which stable cold air (-30 ° C.) is obtained from the cool air supply device 20, the operator presses the grinding start button or automatically starts the grinding. Is done. In the grinding process, a command is issued from the sequence controller 54 by the numerical controller 50,
The grinding wheel 13 is driven to rotate by the drive motor 16. Thereafter, a command is issued from the sequence control device 54 to the electromagnetic switching valve 55 to switch the port, and the cold air supply device 20
Is switched to the A port for supplying the cool air from the nozzle 19 to the nozzle 19 side. Then, cool air is supplied from the nozzle 19 toward the grinding point P of the grinding wheel 13. That is, the numerical controller 50 starts the drive motor 16 to rotationally drive the grinding wheel 13, and then switches the electromagnetic switching valve 55 from the B port on the drain side to the A port on the nozzle 19 side, thereby turning the rotating grinding wheel. The cooling air is supplied to the grinding point P of the vehicle 13. At this time, in order to reliably detect that the grinding wheel 13 is rotating, a current detection circuit for detecting a current value of the drive motor 16 or a rotation angle sensor is provided on a grinding wheel shaft supporting the grinding wheel 13. After detecting these feedback values, a command may be issued to the electromagnetic switching valve.

Then, the numerical controller 50 sends the driving circuit 5
2, the servo motor 11 is driven, and rough grinding, fine grinding, fine grinding and grinding are performed. After grinding,
The numerical controller 50 quickly returns the grindstone table 15 to the original position, and then, through the sequence controller 54, the electromagnetic switching valve 55
To the B port to allow the cool air to bypass to the drain side (B port). Thereafter, that is, after the supply of the cool air from the nozzle 19 is shut off, the drive motor 16 is stopped by a command from the sequence control device 54, and the rotational drive of the grinding wheel 13 is stopped.

Next, the above control by the numerical controller 50 and the sequence controller 54 will be described with reference to the flow chart of FIG. When the preparation operation start is started in step 1, s
At step 2, a command to switch the electromagnetic switching valve 55 to the B port is given from the sequence control device 54. And s
At step 3, a start command is given to the cold air supply device 20. When the cool air temperature T is cooled to a desired temperature Tn, a grinding wheel rotation command is given to the drive motor 16 and the grinding wheel 13
Is started (step 4 and step 5).
At this time, a temperature sensor may be provided on the pipe 17 between the cold air supply device 20 and the nozzle 19 in order to reliably detect that cooling is being performed.

After a rotation command of the grinding wheel 13 (step 5), a command is issued from the sequence control device 54 to the electromagnetic switching valve 55 at step 6 to switch to the A port, and then grinding is performed. (Step 7) When the grinding is completed, the process moves to the next workpiece (st7).
ep8). If there is no next processing, step 8 to step
The process proceeds to p9, where the electromagnetic switching valve 55 is switched to the B port by a command from the sequence control device 54, and the supply of the cool air to the grinding point P is shut off. Then, the process proceeds to step 10, where the rotation of the grinding wheel 13 is stopped.

If the operation of the machine is to be stopped in step 11, that is, if the grinding process is only temporarily interrupted due to a setup change or break, the END of step 13 is left as it is.
If the operation of the entire machine is stopped and the power of the machine is turned off, the process proceeds to step 12, where the cold air supply device 20 is stopped and the process ends (step 13). In the above-described embodiment, the electromagnetic switching valve 55 is provided in the pipe 17 between the cold air supply device 20 and the nozzle 19 as the cool air supply control means to supply and shut off the nozzle 19, but FIG. 2
As shown in the embodiment, the nozzle 19 may be pivotally connected to the tip of the pipe 17 and pivoted via a motor provided on the grindstone table 15. Further, the movement may be performed not by a motor but by a cylinder drive. That is, the motor or the cylinder is driven by a command from the sequence control device 54, and during the rotation of the grinding wheel 13, the opening direction of the nozzle 19 is directed to the grinding point P, and the grinding wheel 1 is rotated.
While the rotation of the wheel 3 is stopped, the opening direction of the nozzle 19 is changed to the grinding wheel 13.
, The workpiece W, and other mechanical systems, for example, to a duct side provided above the drawing.
Then, the cool air is returned from the duct to the cool air supply device 20 via the filter FT.

Next, a third embodiment of the present invention will be described with reference to FIG. The description of the same parts as those in the first and second embodiments is omitted. Above the grinding wheel cover 30 that covers the grinding wheel 13, the pipe 1 for supplying the cold air is provided.
A lubricating oil supply pipe 31 is installed in parallel with 7, and a lubricating nozzle 32 opened toward the grinding wheel 13 is provided at the tip thereof.
Is provided. The pipe 31 is connected to a lubricating oil supply device 33 for supplying lubricating oil via an electromagnetic switching valve 34. The lubricating oil supply device 33 and the electromagnetic switching valve 34 are connected to the sequence control device 54 for controlling the operation thereof. It is connected. The lubricating oil supply device 33 includes the sequence control device 5
Pump lubricating oil from tank 35 according to the command from 4,
The lubricating oil is supplied from the lubrication nozzle 32 to the grinding point P or the surface of the grinding wheel 13 in the form of a mist via the electromagnetic switching valve 34. The electromagnetic switching valve 34 is operated by a command from the sequence control device 54. The lubricating oil supplied from the lubricating oil supply device 33 is switched between an A ′ port on the lubricating nozzle 32 side and a B ′ port on the tank 35 side.

Next, the operation of the third embodiment will be described with reference to the flowchart shown in FIG. When a start start button or a preparation operation start button is pressed in step 1, the numerical control device 50 sends the electromagnetic switching valve 5 via the sequence control device 54.
5 and 34, the connection with the cold air supply device 20 is set to B.
After switching the connection with the lubricating oil supply device 33 to the port, that is, the drain side, to the B ′ port, that is, the tank 35 side, the cold air supply device 20 and the lubricating oil supply device 33 are activated. (Step 2 and Step 3) After the time T (approximately 20 minutes) at which stable cold air (−30 ° C.) is obtained from the cool air supply device 20 has elapsed (elapsed time Tn), the operator presses the grinding start button. Then, a grinding command is automatically issued from the numerical controller 50. (Step 4,
(Step 5) Then, in step 6, a command is issued from the sequence controller 54 by the numerical controller 50, and the grinding wheel 13 is rotationally driven by the drive motor 16. Thereafter, a command is issued from the sequence control device 54 to the electromagnetic switching valve 55 to switch the port, and switching to the A port for supplying the cool air from the cool air supply device 20 to the cool air nozzle 19 is performed.
Cold air is supplied from the cold air nozzle 19 toward the grinding point P of the grinding wheel 13. (Step 7) That is, the numerical control device 50 starts the drive motor 16 to rotationally drive the grinding wheel 13, and then turns the electromagnetic switching valve 55
Is switched from the B port on the drain side to the A port on the cold air nozzle 19 side, so that the rotating grinding wheel 13 is rotated.
Cool air of about -30 ° C. is supplied to the grinding point P.

At this time, in order to detect that the grinding wheel 13 is rotating reliably, a current detecting circuit for detecting a current value of the drive motor 16 or a rotation angle of a grinding wheel shaft supporting the grinding wheel 13 is provided. A sensor may be provided to issue a command to the electromagnetic switching valves 55 and 34 after detecting these feedback values. Thereafter, when the numerical controller issues a command to start the first grinding step in the grinding cycle, for example, the rough grinding step (step 8), the electromagnetic switching valve 34 is moved from the B ′ port on the tank 35 side to the A on the lubrication nozzle 32 side. The port is switched, and a small amount of lubricating oil of about 10 cc / h is sprayed in a mist shape toward the grinding point P or the surface of the grinding wheel 13 (step 9). Then, the servomotor 11 is driven from the numerical controller 50 via the drive circuit 52 to perform processing (for example, a rough grinding step) (st
ep10).

When the processing (rough grinding step) is completed, the numerical controller 50 gives a command to the electromagnetic switching valve 34 via the sequence controller 54 to switch the B 'port, that is, the lubricating oil to the tank 35 side ( step11). Next, ste
At p12, it is determined whether or not the grinding wheel needs to be corrected.
To the grinding wheel correction cycle of ep13, if not, the next step
Move to 17.

In the grindstone correction cycle, a grindstone correction cycle start command is issued in step 13 (step 13).
After switching the electromagnetic switching valve 34 to the port A '(st
ep14), the grinding wheel correction is executed, and when the grinding wheel correction is completed, after the electromagnetic switching valve 34 is switched to the B ′ port, s
Return to step17. Next, in step 17, if there is a next processing step (for example, a fine grinding step or a fine grinding step),
Returning to p8, a command to start the next machining step is issued, and after giving a command to the electromagnetic switching valve 34 to start supplying lubricating oil to the surface of the grinding wheel, machining is resumed.

That is, at the same time when commands for each of the processing steps (coarse grinding step, fine grinding step, fine grinding step) are issued, the electromagnetic switching valve 34 is switched to the port A ', and the grinding point P or the surface of the grinding wheel is When the machining process is completed, the electromagnetic switching valve 34 is switched to the port B ', and the supply of the lubricating oil to the grinding wheel is stopped. If there is no next processing step in step 17, it is determined in step 18 whether or not the next processing, that is, the next processing location or the next workpiece is to be processed, and if there is the next processing, the process returns to step 8. The necessary processing is repeated again. If there is no next processing, in step 19, the electromagnetic switching valve 55 bypasses the B port, that is, the cool air to the drain side.

Thereafter, that is, after the supply of the cool air from the cool air nozzle 19 is cut off, the drive motor 16 is stopped by a command from the sequence control device 54 and the grinding wheel 13 is stopped.
Is stopped (step 20). Then ste
If the operation of the machine is stopped at p21, that is, if only the grinding is temporarily interrupted due to setup change or break, go to step 23 END, stop the operation of the entire machine, and turn off the power. The process proceeds to step 22, the cold air supply device 20 is stopped, and the process ends (step 23).

Incidentally, in the third embodiment,
The supply and stop of the lubricating oil are performed in accordance with the start and end of the machining process. As another form, the supply and stop of the lubricating oil are performed in accordance with the rotation and stop of the grinding wheel, similarly to the supply of cold air. The lubricating oil may be supplied / stopped in each processing cycle in which each step such as a rough grinding step, a fine grinding step, and a fine grinding step is one cycle.

In the third embodiment,
Although the cool air nozzle 19 for supplying cool air and the lubricating nozzle 32 for supplying lubricating oil are separately provided, the number of parts can be reduced and the area around the grindstone head can be simplified by sharing the nozzle. it can.

[0031]

According to the present invention, there is provided a cool air supply control means for controlling the supply of cool air from the cool air supply device to the nozzle in accordance with the rotation / stop control of the grinding wheel by the control device. With a supply switching control valve that shuts off the supply to the grinding wheel, and with a nozzle moving means that moves the direction of the nozzle from the grinding point of the grinding wheel, cool air is directed toward the grinding point while the grinding wheel is rotating. Supply,
Since the supply of the cool air to the grinding portion is stopped while the rotation of the grinding wheel is stopped, the cool air is not supplied to only a part of the grinding wheel. Therefore, it is possible to prevent the grinding wheel from locally causing thermal shrinkage, thereby preventing imbalance of the grinding wheel, peeling of the grinding wheel layer, and occurrence of cracks in the grinding wheel. Extends life.

Further, by controlling the supply and the stop of the lubricating oil in accordance with the start and the stop of the machining cycle or the rotation and the stop of the grinding wheel, the oil accumulation of the lubricating oil on the table or the bed is eliminated, and Also, there is an effect that the chips can be easily regenerated because adhesion of the lubricating oil is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a cold air grinding apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating the flow of a numerical controller and a sequence controller.

FIG. 3 is a diagram illustrating a cold air grinding apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a cold air grinding apparatus according to a third embodiment of the present invention.

FIG. 5 is a flowchart illustrating a flow of a numerical control device and a sequence control device according to a third embodiment.

[Explanation of symbols]

 1 Bed 3 Ball screw 5 Table 7 Spindle 9 Spindle head 11 Servo motor 15 Grinding wheel head 16 Starting motor 17, 31 Pipe 19 Cold air nozzle 20 Cold air supply device 32 Lubrication nozzle 33 Lubricating oil supply device 34, 55 Electromagnetic switching valve 50 Numerical control Device 52 Drive circuit 54 Sequence control device

Continuation of the front page (72) Inventor Takayuki Yoshimi 1-1-1 Asahi-cho, Kariya-shi, Aichi Pref.

Claims (8)

[Claims] A whetstone that moves relative to a workpiece;
A grinding wheel that is rotatably supported on the grinding wheel head and grinds a workpiece by relative movement of the grinding wheel head, a nozzle provided on the grinding wheel head, and opened toward a grinding portion of the grinding wheel, and via the nozzle A cold air supply device for supplying air cooled to 0 ° C. or less, a control device for controlling the rotation of the grinding wheel, and a cool air supply to a grinding portion of the grinding wheel according to the rotation / stop control of the grinding wheel by the control device. A cold-air grinding device comprising cold-air supply control means for controlling the supply of water. 2. The cold air grinding apparatus according to claim 1, wherein said cold air supply control means comprises a supply switching control valve provided between said cold air supply device and a nozzle. 3. The cold-air grinding apparatus according to claim 1, wherein said cold-air supply control means comprises nozzle moving means for moving said nozzle to move in an opening direction thereof. 4. Cold air grinding for supplying cold air to a grinding point of a grinding wheel when grinding a workpiece by moving a grinding wheel base rotatably supported by the grinding wheel relative to the workpiece. In the processing device, while the grinding wheel is rotating, supply cold air toward the grinding location,
A cold air grinding method comprising controlling the supply of cold air to a grinding location while the rotation of the grinding wheel is stopped. 5. A grindstone head that moves relative to a workpiece;
A grinding wheel that is rotatably supported on the grinding wheel head and grinds a workpiece by relative movement of the grinding wheel head, a cold air nozzle provided on the grinding wheel head and opened toward a grinding portion of the grinding wheel wheel, And a lubrication nozzle opened toward the grinding location or the grinding wheel, and a cold air nozzle through the cold air nozzle.
A cold air supply device for supplying air cooled to a temperature of not more than ℃, a lubricating oil supply device for supplying lubricating oil to a grinding point or a grinding wheel surface via the lubrication nozzle, a control device for controlling rotation of the grinding wheel, A cold air grinding apparatus comprising: a lubricating oil supply control unit that controls supply of lubricating oil to a grinding location or a grinding wheel in accordance with rotation / stop control of the grinding wheel by a control device. 6. A grindstone head that moves relative to a workpiece;
A grinding wheel that is rotatably supported on the grinding wheel head and grinds a workpiece by relative movement of the grinding wheel head, a cold air nozzle provided on the grinding wheel head and opened toward a grinding portion of the grinding wheel wheel, And a lubrication nozzle opened toward the grinding location or the grinding wheel, and a cold air nozzle through the cold air nozzle.
A cold air supply device that supplies air cooled to a temperature of less than or equal to or below, a lubrication oil supply device that supplies lubrication oil to a grinding point or a grinding wheel via the lubrication nozzle, a control device that controls rotation of the grinding wheel, A cold air grinding apparatus comprising: a lubricating oil supply control unit that controls supply of lubricating oil to a grinding location or a grinding wheel in accordance with a processing step and a start / stop of a grinding wheel correction cycle by a control device. 7. The cold-air grinding according to claim 5, wherein said lubricating oil supply control means comprises a supply switching control valve provided between said lubricating oil supply device and a lubricating nozzle. Processing equipment. 8. When grinding a workpiece by moving a grinding wheel base rotatably supported by the grinding wheel relative to the workpiece, lubricating oil is supplied to a grinding portion or a surface of the grinding wheel. In a cold air grinding apparatus for supplying cold air to a grinding point, controlling the supply of cold air to the grinding point only while the grinding wheel is rotating, during processing of a workpiece by the grinding wheel and grinding wheel correction. A cold air grinding method characterized by controlling lubricating oil to be supplied only to a grinding portion or the surface of a grinding wheel inside.