JP2003311618A - Fluid supply nozzle used for grinding wheel, and grinding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient fluid supply nozzle for simply supplying only an appropriate amount required for improving a grinding effect without being affected by air flow occurring on the peripheral surface of a grinding wheel following rotation of the grinding wheel. <P>SOLUTION: The fluid supply nozzle comprises a nozzle body 7 butted on the peripheral surface 6 of the grinding wheel in a substantially adhering state and a nozzle inner box 8 containing nozzle body 7 for bringing it close to or separating from the peripheral surface 6 of the grinding wheel, or holding it at a position. A peripheral-edge-shaped supply opening 5 of the nozzle body 7 for supplying fluid for a grinding wheel is surrounded by longitudinal peripheral edges 18a and 18b with a transfer shape copying with the cross section of the peripheral surface 6 and a lateral peripheral edge 20 facing to the peripheral shape of the peripheral surface 6. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a grinding fluid such as a grinding fluid, a cooling fluid or a cleaning fluid to improve the grinding effect of a rotating grinding wheel (such as good grinding and reduction of environmental pollution in the surroundings). The present invention relates to a fluid supply nozzle used for a grinding wheel that supplies an appropriate amount to a grinding wheel.

The term "fluid for a grindstone" as used in the present invention includes a grinding fluid that causes a grinding action during grinding, a cooling fluid for a grindstone that suppresses the reduction of the grinding action, and a cleaning fluid that cleans the circumferential surface of the grindstone after grinding. Further, the cooling liquid mainly refers to a liquid having a cooling effect, but includes not only a liquid but also a gas having a cooling effect and a mixture of the liquid and the gas, which are represented by the term of the cooling liquid.

[0003]

2. Description of the Related Art In order to enhance the grinding effect of a rotating grinding wheel, a grinding liquid or cooling liquid supply nozzle for supplying an appropriate amount of grinding liquid or cooling liquid to the peripheral surface of the grinding stone is used (see Japanese Patent Publication No. 62-043834). . However, simply supplying the grinding liquid or the cooling liquid makes it difficult for the grinding liquid to reach the grindstone peripheral surface, particularly the grinding point, due to the air flow that is entrained around the grindstone peripheral surface as the grinding grindstone rotates. Therefore, various fluid supply nozzles have been proposed, but each has its own problems. For example, high-pressure liquid jet nozzles have been pointed out to have disadvantages such as an increase in cost since they require a high-pressure device and an increase in energy consumption due to high pressure. When using this high-pressure liquid jet nozzle, in high-speed grinding,
It becomes more difficult to break the air flow that entrains the grinding wheel and supply the grinding liquid or cooling liquid to the grindstone peripheral surface.If it is attempted to break the air flow and supply the grinding liquid or cooling liquid, extremely high pressure is required. Then, this high pressure brakes the rotation of the grindstone, which in turn causes a problem that a high-power grindstone motor is required to rotate the grindstone.

Further, since the winding nozzle uses a large amount of grinding liquid, there is a problem of increasing the apparent mass of the grinding wheel. Even if the amount of the grinding liquid used is reduced to a small amount, the gap between the winding nozzle and the grindstone peripheral surface is not controlled, so that the gap is varied, and as a result, the grinding effect is varied. In addition, high-speed grinding requires a high-power grindstone motor as in the above high-pressure jet nozzle. In cold air grinding that uses cold air instead of the cleaning liquid, naturally there is no lubrication effect and the surroundings of the work and the like are also cooled, but the cooling effect at the peripheral surface of the whetstone, especially at the grinding point, is low. Therefore, a large cooling device is used to obtain a sufficient cooling effect, and as a result, there is a drawback that a large amount of electric power is required.
Further, in cold air grinding, in order to break the air flow in high speed grinding, there is a problem that a higher pressure than that when using a cooling liquid is required. Similarly, mist (semi-dry) grinding has a problem in that mist diverges in addition to the grinding point, which obstructs the atmosphere and requires high-speed grinding at the same high pressure as cold-air grinding.

[0005]

The above-mentioned problems in the conventional fluid supply nozzle are difficult to properly supply the grindstone fluid because of the air flow generated on the peripheral surface of the grindstone as the grinding grindstone rotates. This hinders the improvement of the grinding effect by the grinding wheel, and brings about problems such as an increase in cost and an adverse effect on the environment, as is already clear. In order to solve this problem, reduce the supply amount of the grinding wheel fluid above all,
There is a demand for an efficient means for supplying a fluid for a grindstone that is sufficient to supply only an appropriate amount necessary for improving (improving) the grinding effect. However, none of the conventional fluid supply nozzles satisfies the above requirements. Therefore, we have developed an efficient fluid supply nozzle that is not affected by the air flow generated on the grinding wheel peripheral surface as the grinding wheel rotates, and only needs to supply the appropriate amount necessary to improve (improve) the grinding effect. In order to do so, I examined.

[0006]

[Means for Solving the Problems] In order to enhance the grinding effect of a rotating grinding wheel, a fluid supply nozzle used for the grinding wheel that supplies a grinding wheel fluid to the grinding wheel peripheral surface has been developed as a result of the study. Nozzle main body that is placed in close contact with the nozzle body, and a nozzle inner box that inserts the nozzle main body toward and away from the grindstone so that the nozzle body can be moved toward and away from the grindstone and holds the position. Is a fluid supply nozzle used for a grinding wheel having a peripheral shape surrounded by a vertical peripheral edge of a transfer shape following the cross section of the peripheral surface of the grindstone and a lateral peripheral edge along the peripheral shape of the peripheral surface of the grindstone. The grindstone fluid used in the present invention is
In addition to the grinding liquid, the cooling liquid, the cleaning liquid, a gas having a cooling effect and a mixture (mist) of the liquid and the gas are included. The pressure required to supply the grindstone fluid may be, for example, lower than or equal to the pressure generated by the grinding fluid pump attached to the grinding machine, and may be a pressure sufficient to supply an extremely small amount of fluid.

In the fluid supply nozzle of the present invention, the nozzle body is placed in close contact with the peripheral surface of the grindstone to (1) isolate the inside of the nozzle main body from the air flow entrained around the peripheral surface of the grindstone by the rotation of the grinding wheel. However, it has a function to prevent the supplied grinding wheel fluid from being affected by the air flow, and (2) keeps the supplied grinding wheel fluid in the supply opening at the end of the supply path to provide the minimum necessary and appropriate amount of grinding wheel fluid. To obtain the effect of sufficiently improving the grinding effect.
The "substantially close contact state" means that the gap t between the supply opening peripheral edge (vertical peripheral edge of the vertical wall and horizontal peripheral edge of the horizontal wall) of the nozzle body and the grindstone peripheral surface is such that the functions of (1) and (2) above are realized. Refers to the small case. Here, when considering the vertical peripheral edge on the upstream side in the rotational direction, the upper and lower horizontal peripheral edges, and the vertical peripheral edge on the downstream side in the rotational direction in the substantially rectangular supply opening, especially the gap between the vertical peripheral edge on the upstream side in the rotational direction and the grindstone peripheral surface. It is only necessary to adjust t within the range of 0 <t ≦ 0.3 mm,
For example, in heavy grinding or the like, the gap between the vertical peripheral edge on the downstream side in the rotation direction and the grindstone peripheral surface may be made larger than the above range in order to promote discharge of the grindstone fluid.

In order to realize the operations of (1) and (2), the supply opening of the nozzle body must be brought into close contact with the peripheral surface of the grindstone. Therefore, in the present invention, in order to adjust the positional relationship of the supply opening with respect to the grindstone circumferential surface, (a) the nozzle body is inserted into the nozzle inner box so that the nozzle body can be moved toward and away from the grindstone circumferential surface and the position can be held. . Preferably, further
(b) The nozzle inner box may be attached to the nozzle outer box so as to be movable and positionally held in a direction orthogonal to the approaching / separating direction of the nozzle body. Thus, the linear distance of the supply opening to the grindstone circumferential surface can be directly adjusted by the insertion depth of the nozzle body with respect to the nozzle inner box, and the vertical or horizontal positional relationship of the supply opening with respect to the grindstone circumferential surface is the nozzle into which the nozzle body is inserted. It can be indirectly adjusted by the positional relationship between the inner box and the nozzle outer box. In addition, by allowing the nozzle body for the inner box of the nozzle and the inner box of the nozzle for the outer box to be held in position, the gap between the supply opening of the nozzle body that receives the reaction force due to the supply of the fluid for the grindstone and the grindstone peripheral surface is made constant. Can be kept.

A specific means for allowing the nozzle body to move toward and away from the peripheral surface of the grindstone and to hold the position thereof is as follows: an inner micrometer having an inner spindle shaft extending from the nozzle body to the outside of the nozzle inner box, and An example of such a structure is that the surface can be moved toward and away from the surface and the position thereof can be held.
Further, the adjustment amount by the inner micrometer can be grasped by providing an inner dial gauge based on the inner box of the nozzle with respect to the nozzle body. Similarly, a specific means for moving and maintaining the position of the inner box of the nozzle in the direction orthogonal to the approaching / separating direction of the nozzle body is to use an outer micrometer having an outer spindle shaft extending from the inner box of the nozzle to the outside of the outer box of the nozzle. An example is a configuration in which the nozzle body can be moved and held in a position orthogonal to the approaching / separating direction of the nozzle body. The adjustment amount by the outer micrometer can be grasped by providing an outer dial gauge based on the nozzle outer box with respect to the nozzle inner box. The unit of adjustment by each micrometer is 0.
It can be 001 to 0.01 mm. Here, as the “direction orthogonal to the approaching / separating direction of the nozzle body”, any direction orthogonal to the approaching / separating direction of the nozzle body can be selected, but preferably the rotation surface direction of the grinding wheel or the rotation surface orthogonal direction is good. . Furthermore, since the direction of rotation surface is accompanied by the approach and separation of the nozzle body, basically it is advisable to move the inner box of nozzles in the direction orthogonal to the surface of rotation.

It is necessary to identify the shape of the supply opening at the end of the supply path so that the supply opening is in close contact with the peripheral surface of the grindstone. Regarding this shape identification, the supply opening of the present invention has a peripheral shape surrounded by a vertical peripheral edge of a transfer shape following the cross section of the peripheral surface of the grindstone and a lateral peripheral edge along the peripheral shape of the peripheral surface of the grindstone. As a specific peripheral shape of the supply opening, a substantially rectangular shape or a substantially circular shape (including an elliptical shape) can be considered. In the substantially rectangular peripheral shape, the vertical wall edge in the direction orthogonal to the rotation surface of the grinding wheel is the vertical edge, and the horizontal wall edge in the rotation surface direction of the grinding wheel is the horizontal edge. With a substantially circular peripheral shape, the vertical peripheral edge and the horizontal peripheral edge are continuous, so the wall edge that is generally oriented in the direction orthogonal to the rotation surface of the grinding wheel is the vertical edge, and the wall edge that is generally oriented in the rotation surface direction of the grinding wheel is Can be seen as the lateral margin. The vertical peripheral edge does not necessarily have a flat grindstone peripheral surface, and therefore has a transfer shape that follows the cross section of the grindstone peripheral surface. The gap may be managed individually.

Here, the lateral peripheral edge of the supply opening may be an arc edge following the upper and lower peripheral edges of the grindstone circumferential surface, but in order to suppress the scattering of the grindstone fluid supplied, the radial direction of the grinding grindstone from the grindstone circumferential surface can be suppressed. It is preferable that the lateral edges project inward. This lateral edge has a positional relationship such that the grinding wheel is sandwiched, and it is possible to prevent the fluid for the grinding wheel from being scattered about in the direction orthogonal to the rotation of the grinding wheel. The specific lateral edge may be an arc edge or a straight edge. Here, when the moving direction of the nozzle inner box with respect to the nozzle outer box is a direction orthogonal to the rotation surface, the adjustment of the positional relationship of the nozzle inner box with respect to the nozzle outer box is the adjustment of the gap of the lateral wall with respect to the grinding wheel plane. .

By using the fluid supply nozzle capable of adjusting the gap between the supply opening and the grindstone peripheral surface as in the present invention, the grinding effect can be suppressed while the amount of the fluid for the grindstone is suppressed by making the gap as narrow as possible. Can be increased. That is, in order to enhance the grinding effect of the rotating grinding wheel, when the grinding wheel fluid is supplied to the grinding wheel peripheral surface, the nozzle body supplying the grinding wheel fluid is adjusted in position and held in the direction away from the grinding wheel circumferential surface. The range in which this nozzle body blocks the air flow that entrains the grinding wheel in the gap t between the grindstone fluid supply opening and the grindstone circumferential surface, specifically, the vertical peripheral edge on the upstream side of rotation and the grindstone circumferential surface. Adjusting the clearance t between 0 and t within the range of 0 <t ≤ 0.3 mm, and suppressing the amount of the grinding wheel fluid supplied from this supply opening to the grinding wheel peripheral surface, the grinding effect (good grinding and reduction of surrounding environmental pollution, etc. ) Can be used. Here, "to suppress the amount used" basically means that the amount required is smaller than the amount conventionally required,
For example, even if you supply cooling fluid or grinding fluid of several tens cc / min.
A sufficient cooling effect and grinding effect can be obtained. This grinding method is characterized in that the gap t between the supply opening of the nozzle body and the grindstone peripheral surface, particularly the gap t between the vertical peripheral edge on the upstream side of rotation and the grindstone peripheral surface, is controlled. Can be better achieved by using.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cooling and lubricating fluid supply nozzle 1 and a cleaning fluid supply nozzle 2 according to the present invention.
4 is a side view of a grinding device in which the and are arranged in an opposing relationship with the grinding wheel 3 sandwiched therebetween. FIG. 2 is an enlarged sectional view in the vicinity of the cooling and lubricating fluid supply nozzle 1, and FIG. 3 is an AA sectional view in FIG. 1 is an enlarged sectional view taken along line BB in FIG. 1, FIG. 5 is an enlarged sectional view taken along line CC of FIG. 1, and FIG. 6 is an enlarged sectional view taken along line DD of FIG. In this example, as shown in FIG. 1, a hood 4 covers a grinding stone 3 made of an annular abrasive grain layer formed on a rotating peripheral surface of a base portion, and a grinding point (the peripheral surface of the grinding stone and an object to be ground are different from each other). The cooling and lubricating fluid supply nozzle 1 is provided on the upstream side of the rotation of the contact portion), the cleaning fluid supply nozzle 2 is provided on the downstream side of the rotation, and the respective supply openings 5,
5 is arranged so as to be in close contact with the peripheral surface 6 of the grindstone.
Basically, the fluid supply nozzles 1 and 2 facing each other have the same structure in addition to the difference in the supplied grindstone fluid. Therefore, the cooling and lubricating fluid supply nozzle 1 will be described below.

Cooling and lubricating fluid supply nozzle 1 of this embodiment
As shown in FIGS. 2 and 3, the nozzle main body 7 that directs the supply opening 5 to the grindstone circumferential surface 6 in a substantially intimate contact state, and the nozzle body 7 that moves toward and away from the grindstone circumferential surface 6 and its position. It comprises a nozzle inner box 8 which is insertable in a releasable manner, and a nozzle outer box 9 in which the nozzle inner box 8 is movable in the direction orthogonal to the rotation surface of the grinding wheel 3 and can be held in position. The nozzle body 7 has an inner micrometer 11 that extends the inner spindle shaft 10 outside the inner box 8 of the nozzle.
And an inner dial gauge 12 based on the nozzle inner box 8 is provided. As a result, the nozzle body 7 has a clearance t (see FIGS. 2 and 5) between the grindstone peripheral surface 6 and the supply opening 5 of 0 to 0.3 mm.
In the range of 0.001 mm, it can be adjusted at a pitch of 0.001 mm and can be moved toward and away from the grindstone peripheral surface 6 and held in position (see thick arrows in FIGS. 1 and 2). Similarly, the inner nozzle box 8 is provided with an outer micrometer 14 extending the outer spindle shaft 13 outside the outer nozzle box 9 and an outer dial gauge 15 based on the outer nozzle box 9 for the inner nozzle box 8. . As a result, the nozzle body 7 is
It is possible to adjust the position in the direction orthogonal to the approaching / separating direction via the inner box 8 that moves and holds the position of the grinding wheel 3 in the direction orthogonal to the rotation surface of the grinding wheel 3 at a pitch of 0.001 mm with respect to the outer box 9 (see the thick arrow in FIG. 3). 1 and 2, the normal direction to the paper surface).

The nozzle body 7 has a grindstone fluid supply path 16 in a transverse direction which does not pass through the center of the grindstone 3. The grindstone fluid supply pipe 21 includes the nozzle inner and outer boxes 8 and 9.
Is connected to the nozzle body 7 by penetrating therethrough, and the flow rate of the grindstone fluid supplied by the flow rate control valve 22 provided on the way can be adjusted. In the cooling and lubricating fluid supply nozzle 1 of this example, the supply path 16 is inclined with respect to the tangential direction so as not to hinder the rotation of the grinding wheel 3, and further from the upstream side to the downstream side in the rotation direction of the grinding wheel 3. A grindstone fluid (specifically, a grinding liquid or a cooling liquid) is supplied. In the present invention, the supply opening 5 is in a substantially intimate contact state with the grindstone circumferential surface 6 so that such a grindstone fluid can be utilized without waste even though the fluid is minimal. Specifically, when the cross section of the grinding wheel peripheral surface 6 in this example has the shape shown in FIG. 4, the vertical peripheral edge 18a (18b) of the vertical wall 17 orthogonal to the rotation direction of the grinding wheel 3 is the grinding wheel peripheral surface. 6 has a transfer shape (see FIGS. 3 and 5) that follows the above-mentioned cross section, and the inside of the nozzle main body 7 (specifically, the supply path 16) from the air flow that the grinding wheel 3 rotates
It also shuts off and prevents the fluid for the grindstone from scattering. Here, since a large amount of grinding wheel fluid is required for highly efficient heavy grinding that produces a large amount of grinding dust, when the present invention is used, the vertical peripheral edge 18b on the downstream side in the rotational direction of the grinding wheel 3 and the grinding wheel peripheral surface 6 are used. It is advisable to increase the gap t between and. In this case, the air flow entrained by the grinding wheel can be prevented by accurately controlling the gap t between the vertical peripheral edge 18a on the upstream side in the rotation direction and the wheel peripheral surface 6.

Then, the lateral wall 19 in the rotation direction of the grinding wheel 3 is prevented so that the supplied grinding wheel fluid is not repelled by the grinding wheel peripheral surface 6 of the rotating grinding wheel 3 and scattered in the direction orthogonal to the rotation surface.
Has a lateral peripheral edge 20 protruding inward in the radial direction of the grinding wheel 3 from the wheel peripheral surface 6 (see FIGS. 1 and 2). As described above, the peripheral edges 18 and 20 surrounding the supply opening 5 have a very small gap t (see FIGS. 2 and 5) with respect to the grindstone circumferential surface 6 (in this example, in the direction of approaching and separating from the grindstone circumferential surface 6 of the nozzle body 7). The adjustment range can be set to 0 to 0.3 mm), and the substantially square-shaped supply opening 5 can be isolated from the outside and applied to the grindstone peripheral surface 6 (see FIG. 6). As a result, a small amount (appropriate amount) of the grinding stone fluid can be used without waste, and the grinding effect can be improved. The material of the nozzle body 7 is not specified, but the nozzle body 7 may be formed of, for example, a resin material or carbon in consideration of contact with the grindstone peripheral surface 6.

FIG. 7 is a side view of another example of a grinding apparatus according to the present invention in which a cooling and lubricating fluid supply nozzle 1 and a cleaning fluid supply nozzle 2 are arranged in an opposed relationship with a grinding wheel 3 interposed therebetween. The nozzle main body 7 in which the supply path (= the supply direction of the fluid for the grindstone) is inclined between the normal direction and the tangential direction of the grindstone peripheral surface 6 is the facing relation direction of both supply nozzles 1 and 2 seen in FIG. In addition to moving the feed nozzles 1 and 2 toward and away from the grindstone circumferential surface with the inner micrometers 11 and 11 in the same parallel direction (see the thick arrow in FIG. 7), as shown in FIG. In the same manner, it is possible to make the grindstone approach and separate from the circumferential surface. When moving in the facing relationship direction, the amount of approach / separation = adjustment amount × sin α (α = tilt angle of the grindstone fluid supply direction to the grindstone circumferential surface 6), and when moving in the same direction in parallel, the amount of approach / separation = adjustment amount × Since it is cos α, the movement amount with respect to the adjustment amount of the micrometer is different, and the supply opening 5 of the nozzle body 7 is moved toward and away from the grindstone circumferential surface 6 without any change. With the configuration shown in FIG. 7,
Since the protrusion of each part on the left and right of the grinding device can be suppressed, there is an advantage that the grinding device can be compactly integrated.

[0018]

With the fluid supply nozzle used in the grinding wheel of the present invention, an appropriate amount of the grinding wheel fluid can be used without waste, and a high grinding effect can be improved. The supply opening of the nozzle body, which is in close contact with the peripheral surface of the grindstone, minimizes the gap t with the peripheral surface of the grindstone, so that a small amount of grindstone fluid can be used without waste. Also, it is possible to use less grinding wheel fluid, for example, in the case of cooling liquid, eliminate the problem of overcooling, in high-speed grinding, does not hinder the rotation of the grinding wheel, unnecessary rotation power of the grinding wheel The effect that does not require the enhancement of the. In the present invention, the grindstone fluid that can be used may be liquid, gas, mist, or the like, and is not limited. Therefore, there is an advantage that it can be applied when the grindstone fluid that is used in the conventional grinding apparatus is used.
Further, the grinding stone to which the fluid for the grindstone is supplied is not limited, and the present invention can be applied to a cutting grindstone, a profile grindstone, or a cup grindstone in addition to a normal grindstone. Furthermore, in terms of the types of machines, surface grinders, forming grinders, cylindrical grinders, profile grinders, inner surface grinders, tool grinders, various dedicated grinders, grinding centers, grinding axes for complex machine tools, etc. Although it can be used for various purposes, the present invention is suitable for a field in which high efficiency, high accuracy, and high speed grinding are required, because a high grinding effect can be expected to be improved.

[Brief description of drawings]

FIG. 1 is a side view of a grinding apparatus to which the present invention is applied.

FIG. 2 is an enlarged cross-sectional view near a cooling and lubricating fluid supply nozzle.

FIG. 3 is a sectional view taken along line AA in FIG.

4 is an enlarged cross-sectional view taken along the line BB in FIG.

5 is an enlarged cross-sectional view taken along line CC in FIG.

FIG. 6 is an enlarged cross-sectional view taken along the line DD in FIG.

FIG. 7 is a side view of another example of a grinding apparatus to which the present invention is applied.

[Explanation of symbols]

1 Cooling and lubrication fluid supply nozzle 2 Cleaning fluid supply nozzle 3 grinding wheels 4 hood 5 supply opening 6 Whetstone surface 7 Nozzle body Box with 8 nozzles 9 nozzle outer box 10 Inner spindle axis 11 micrometer 12 inner dial gauge 13 Outer spindle shaft 14 Outside micrometer 15 Outer dial gauge 16 Supply route 17 vertical wall 18a Vertical edge on the upstream side in the direction of rotation 18b Vertical edge on the downstream side in the rotation direction 19 Horizontal wall 20 Edge 21 Supply pipe 22 Flow control valve

Claims (4)

[Claims] 1. A fluid supply nozzle used for a grinding wheel for supplying a grinding wheel fluid to a grinding wheel peripheral surface in order to enhance a grinding effect of a rotating grinding wheel, and a nozzle main body which is applied to the grinding wheel peripheral surface in a substantially adhered state. The nozzle main body comprises an inner box for inserting the nozzle main body toward and away from the grindstone circumferentially and maintaining the position thereof, and the supply opening of the nozzle main body for supplying the fluid for the grindstone has a transfer shape of the cross section of the peripheral surface of the grindstone. A fluid supply nozzle for use in a grinding wheel, which has a peripheral shape surrounded by a vertical peripheral edge and a horizontal peripheral edge along the peripheral shape of the peripheral surface of the grindstone. 2. The fluid supply according to claim 1, wherein the nozzle main body can be moved toward and away from the inner box of the nozzle toward the peripheral surface of the grindstone and can be held in position by an inner micrometer having an inner spindle shaft extending outside the inner box of the nozzle. nozzle. 3. The lateral edge of the supply opening is a lateral edge that protrudes inward in the radial direction of the grinding wheel from the grinding wheel peripheral surface.
The fluid supply nozzle described. 4. In order to enhance the grinding effect of a rotating grinding wheel, the nozzle main body for supplying the fluid for the grindstone is positionally adjusted toward and away from the peripheral surface of the grindstone during the grinding for supplying the fluid for the grindstone to the peripheral surface of the grindstone. While maintaining the position, the nozzle body adjusts the gap t between the supply opening for supplying the grinding wheel fluid and the grindstone peripheral surface within a range in which the air flow entrained in the grinding grindstone is blocked, and from the supply opening to the grindstone peripheral surface. A grinding method for enhancing the grinding effect while suppressing the amount of the supplied grinding wheel fluid.