JPH08192364A - Grinding wheel - Google Patents

Abstract

PURPOSE: To provide a grinding wheel, for which the sufficient quantity of the grinding liquid is supplied to the contact surface and with which a high working accuracy can be obtained even in the case of grinding the material to be ground with the side surface of the grinding wheel. CONSTITUTION: A base 12 of a grinding wheel 10 is provided with plural recessed parts 26, with which are the peripheral side end part of the side surface of a peripheral part 18 and the peripheral surface 24 connected, with an equal space in the circumferential direction (namely, intermittently in the circumferential direction). Consequently, when the grinding liquid jetted toward the side surface is held by the recessed parts 26, since the inertia force generated by the rotation of the grinding wheel 10 applies in the direction for pushing the grinding liquid toward the inner wall surface of the recessed part 26, the grinding liquid held by the recessed parts 26 is rotated by the rotation of the grinding wheel 10, and while directed to the peripheral side by the centrifugal force, and supplied to the peripheral surface of a grinding wheel part 14 fixed to the peripheral surface 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel capable of suitably supplying a grinding liquid to the side surface of a whetstone portion in contact with a work material.

[0002]

2. Description of the Related Art When grinding a work material such as metal or ceramics, contact is made between a grinding surface of a grinding wheel and a work surface of a work material for the purpose of cooling the work material or removing chips. Grinding is performed while supplying the grinding liquid. For example, in a grinding whetstone in which a whetstone portion is fixed to the outer peripheral surface of a disk-shaped base metal, generally, a grinding fluid is ejected from a nozzle or the like toward the contact portion from the side surface side of the grinding whetstone, and the contact portion Is supplied to.

[0003]

By the way, in the grinding process using the above-mentioned disc-shaped grinding wheel, the work material may be processed by the side surface of the whetstone portion. For example, in grooving, the work piece is cut on the outer peripheral surface of the grinding wheel and the side wall of the groove is ground at the same time, or the side wall of the groove is exclusively used for the work material under-processed. Only the surface of the grindstone is ground, but only the side surface of the grindstone is necessary. In addition, by changing the depth of cut in the direction perpendicular to the axial direction of the grinding wheel in accordance with the axial movement amount, the contouring contour is formed by grinding. Depending on the finished shape of the material, machining by the side surface of the grinding wheel may be required.

In the above groove machining, since the grinding is carried out with the grinding surface of the grinding wheel entering the groove and contacting the inner wall surface of the groove, it is necessary to supply the grinding liquid to the grinding wheel. It becomes difficult to supply the grinding fluid from the side surface of the grindstone to the contact surface with the work material. For example, in a vane pump, a cylindrical rotor provided in a housing has a plurality of relatively deep grooves for accommodating flat vanes (blades) in the axial direction from the outer peripheral surface toward the center of rotation. In such deep grooving, the force applied from the work material to the side surface of the grinding wheel increases as the depth of cut deepens. Therefore, it is necessary to make the joint surface between the base metal and the grindstone relatively large, but if this is done, the gap between the side surface of the base metal and the groove side wall surface will be small, and the air accompanying the rotation of the grinding wheel will be reduced. The flow makes it more difficult to supply the grinding fluid to the inside of the groove. In order to achieve smooth operation of the vane, the groove that is the storage portion of the vane, especially the side wall surface of the groove, must be processed with high accuracy, but when the supply of grinding fluid becomes insufficient as described above. There is a problem that the processing accuracy is reduced.

On the other hand, in the above contouring grinding, when the grinding is performed by the outer peripheral surface of the grinding wheel, it is brought into line contact with the work material and the contact area is relatively small. From this, there is no particular problem of supplying the grinding liquid, but when grinding is performed on the side surface of the grinding wheel, the side surface is brought into surface contact with the work material,
As in the case of the above groove machining, it becomes difficult to supply the grinding liquid to the contact portion. This problem is more prominent in high-speed contouring grinding that has been performed in recent years, and there is a problem that grinding burn easily occurs due to lack of grinding liquid.

Therefore, for example, grooves are provided at predetermined intervals in the circumferential direction on the side surface of the grindstone portion provided on the outer peripheral portion of the grinding wheel, or at predetermined intervals in the circumferential direction on the outer circumferential surface of the grindstone portion. It is practiced to provide a slit having a depth of. With this configuration, the grinding fluid ejected toward the side surface of the grinding wheel is guided to the contact surface by the groove or slit of the grinding wheel portion, and therefore, even in the processing of deep grooves such as a vane pump or high-speed contouring grinding. Since the liquid is sufficiently supplied to the contact surface, the occurrence of grinding burn is appropriately suppressed.

However, in any of these methods, on the side surface of the grindstone, the grindstone portion intermittently acts on the work material, so that the corner portion of the grindstone portion is apt to sag, and the grindstone portion In the grinding process where the side of
It is impossible to obtain high processing accuracy.

On the other hand, for example, Japanese Utility Model Laid-Open No. 62-11
As described in Japanese Patent No. 0863, there has been proposed a technique in which through holes penetrating in the axial direction are provided at positions on the relatively outer peripheral side of the base metal at predetermined intervals in the circumferential direction. According to this technique, the grinding fluid is sufficiently supplied to the contact surface as in the case where the grindstone has grooves or slits, and the grindstone is completely continuous even on the side surface of the grindstone so that the corners are sagged. Is less likely to occur. However, if such a through hole is provided in the base metal, the rigidity of the entire grinding wheel is lowered. Therefore, when the grinding wheel is used for simple cutting as described in the above publication, no particular problem arises because the processing accuracy is not so required, but the vane pump and the like as described above are not required. In groove processing, contouring grinding, etc., there arises a problem that required processing accuracy cannot be obtained. Moreover, since the grinding liquid injected toward the through hole as described above is passed through the through hole to the side surface on the opposite side of the grinding wheel, there is also a problem that the injected grinding liquid is not effectively used. is there.

The present invention has been made in view of the above circumstances, and an object thereof is to apply a grinding liquid to the contact surface even when the work material is ground by the side surface of the grindstone portion. An object of the present invention is to provide a grinding wheel that can be sufficiently supplied and can obtain high processing accuracy.

[0010]

In order to achieve such an object, the gist of the present invention is that a grindstone portion is fixed to the outer peripheral surface of a disk-shaped base metal, and the side surface of the grindstone portion A grinding wheel of a type that grinds a work material, that is, a side surface of a grinding wheel that comes into contact with a work material, at least an outer peripheral side portion of the side surface of the base metal, and a grinding liquid supplied to the side surface. A recess is provided for holding and rotating the base metal as it rotates.

[0011]

According to this structure, at least the outer peripheral portion of the side surface of the base of the grinding wheel is a recess for holding the grinding liquid supplied to the side surface and rotating the grinding liquid as it rotates. Is provided. Therefore, the grinding liquid ejected toward the side surface of the grinding wheel is held in the concave portion and is rotated with the rotation of the grinding wheel, and at the same time, is directed toward the outer peripheral side according to the centrifugal force due to the rotation, and the outer circumference thereof is increased. It is supplied to the grindstone portion fixed to the surface. Thereby, even when the side surface of the grindstone portion is in surface contact with the work material, the grinding liquid is sufficiently supplied to the contact surface. Moreover, since the base metal is only provided with the concave portion, its rigidity is not reduced as compared with the case where the through hole is provided, and high processing accuracy can be obtained. Therefore, even when the work material is ground by the side surface of the grindstone portion, it is possible to obtain the grinding grindstone in which the grinding liquid is sufficiently supplied to the contact surface and high processing accuracy is obtained.

Here, it is preferable that the recesses are a plurality of recesses that connect the outer peripheral side end of the side surface of the base metal and the outer peripheral surface and are provided at predetermined intervals in the circumferential direction. With this configuration, since the recesses are provided intermittently in the circumferential direction, the inertial force generated by the rotation of the grinding wheel causes the grinding liquid held in the recesses to be ejected toward the side surfaces of the recesses and the inner wall surface of the recesses. Since it acts in the direction of pressing, the grinding liquid held in the recess is rotated toward the outer peripheral surface according to the centrifugal force while being rotated as the grinding wheel rotates. Moreover, since the concave portion is provided in contact with the inner peripheral surface of the grindstone portion, the grinding liquid held therein is permeated into the grindstone portion by the centrifugal force, so that a larger amount of the grinding liquid is applied to the grinding surface. Will be supplied.

Preferably, the recess is a plurality of grooves extending from the vicinity of the center of the base metal in the outer peripheral direction, connecting the vicinity of the center and the outer peripheral surface, and provided at a predetermined interval in the peripheral direction. . By doing so, the grinding liquid is supplied to the grinding surface by the same action as in the case of the above-mentioned depression, and the grinding liquid supplied relatively to the center side of the base metal is also positively directed to the grindstone portion. Therefore, the grinding liquid is more reliably supplied to the grinding surface.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the following examples, the ratio of the size of each part is not necessarily drawn accurately.

FIGS. 1 to 3 show a grindstone for groove machining (hereinafter, simply referred to as a grindstone) 10 which is an embodiment of the present invention, and FIG. 1 shows about 1/4 part of a front view. FIG. 2 and FIG. 3 are views showing the main part of the cross section. Whetstone 1
0 is an outer diameter of about 350 mm as a whole, for example, a base metal 12 formed in a disk shape from S45C steel or the like,
It is composed of a grindstone portion 14 fixed to the outer peripheral surface of the base metal 12.

The base metal 12 is formed on an inner peripheral portion 16 having a relatively thick thickness of, for example, about 25 mm and an outer peripheral side of the inner peripheral portion 16, and has a thickness of, for example, about 4 mm. And an outer peripheral portion 18 that is thinner than the inner peripheral portion 16.
A mounting hole 20 penetrating in the axial direction is provided in the central portion of the. Further, at the outer peripheral side end portions of the both side surfaces 22, 22 of the outer peripheral portion 18, for example, 16 side surfaces 22 and 22 and the outer peripheral surface 24 of the outer peripheral portion 18 are tied at equal intervals in the circumferential direction. A semicircular recess 26 having a depth of about 30 mm and a depth of about 0.4 mm on the outer peripheral surface 24 is provided. That is, the recess 26 is provided so as to contact the inner peripheral surface of the grindstone portion 14, and in the present embodiment, the recess 26 corresponds to the recess.

On the other hand, the grindstone portion 14 has a length of 40 mm, for example.
Degree, width (diameter of grindstone 10 in the radial direction) about 10mm, thickness 5
It is composed of a large number of grindstone members 27 of about mm. That is, the grindstone portion 14 is thicker in the axial direction than the outer peripheral portion 18 of the base metal 12. The grindstone member 27 is
For example, a support portion 28 formed by bonding general abrasive grains such as aluminum oxide with a binder such as vitrified bond,
For example, superabrasive grains such as CBN (cubic crystal boron nitride) are bonded by a binder such as vitrified bond, and the thickness of the support portion 28 fixed to both surfaces in the thickness direction (axial direction of the grindstone 10) It is composed of a polishing portion 30 of about 1 mm, and the base metal 12 is provided on the supporting portion 28.
It is fixed to the outer peripheral surface 24 of the outer peripheral portion 18.

The results of grooving using the whetstone 10 constructed as described above will be described below. The work material is, for example, a chrome steel cylindrical rotor 32 shown in FIG. 4 (a).
And is provided inside the housing of the vane pump. By attaching the grindstone 10 to the rotary shaft of the grinder for groove machining in the mounting hole 20 and performing the groove machining while spraying the grinding liquid on the side surface 22, as shown in FIG. A groove 34 for accommodating vanes (plate-shaped blades) that axially penetrates both end faces toward the center from the outer peripheral surface.
Was formed. As shown in FIG. 4 (c), the rotor 32 was previously provided with a lower groove 33 having an inverted T-shaped cross section, and the hatched portion 35 (thickness: 0.2 mm) in the figure was removed by groove processing. In the vane pump, in order to realize the smooth operation of the vane, it is necessary to machine the groove 34, which is the storage portion of the vane, particularly the side wall surface thereof with high precision. Therefore, as described above, the polishing section 30 made of superabrasive grains is provided on the side surface of the grindstone member 27 for processing the side wall surface of the groove 34 (that is, both surfaces in the axial direction of the grindstone 10). The processing conditions are shown below.

The processing results are shown below. In addition, No. 1 is the grooving grindstone 10 of the present embodiment, and No. 2 and 3 are the results of processing using the conventional grindstone in which the recesses 26 are not provided in the base metal 12 for comparison. It is shown for. As is clear from the following results, in the case of the grindstone 10 of the present embodiment, it is possible to grind many rotors 32 with one grindstone 10 and the accuracy of the grinded grooves 34 is good. On the other hand, in the case of Comparative Examples Nos. 2 and 3, the number of machinable pieces was relatively small, and moreover, dressing was frequently required due to burnt stones or angular sag.

[0020]

[Table 1]

Here, according to the present embodiment, the base metal 12 of the grindstone 10 connects the outer peripheral side end of the side surface 22 of the outer peripheral portion 18 and the outer peripheral surface 24 to each other at equal intervals in the circumferential direction (that is, A plurality of indentations 26 are provided (intermittently in the circumferential direction). Therefore, when the grinding fluid ejected toward the side surface 22 is retained in the depression 26, the inertial force generated by the rotation of the grindstone 10 acts in the direction of pressing the grinding fluid against the inner wall surface of the depression 26. The grinding liquid held in the recess 26 is rotated along with the rotation of the grindstone 10 and is directed toward the outer peripheral side in accordance with the centrifugal force, and is supplied to the outer peripheral surface of the grindstone portion 14 fixed to the outer peripheral surface 24. To be done. As a result, the side surface of the grindstone portion 14, that is, the polishing portion 30, is fixed to the rotor 32.
(That is, when it is in surface contact with the work material),
The grinding liquid is sufficiently supplied to the contact surface.

Moreover, since the base metal 12 is provided only with the recess 26, the rigidity thereof is not reduced as compared with the case where the through hole is provided, and high processing accuracy can be obtained. Therefore, the groove 34 is formed by the side surface of the grindstone portion 14.
Even when the inner wall surface or the like is ground, a sufficient amount of grinding liquid is supplied to the contact surface and high processing accuracy can be obtained.

Further, since the depression 26 is provided in contact with the inner peripheral surface of the grindstone portion 14, the grinding fluid ejected toward the side surface 22 is applied to the grindstone portion 14 by the centrifugal force generated by the rotation of the grindstone 10. Penetrated. Therefore, the grinding liquid can be more reliably supplied to the grinding surface.

The grindstone 10 is not limited to the groove processing, but can be used for other grinding processing. Figure 5
It is a figure which shows the state which is carrying out contouring (contour) grinding of the cylindrical work material 38 provided with the step part 36. In the grinding of the work material 38 having such a shape, when the end face 40 of the stepped portion 36 requires processing accuracy (dimensional accuracy, surface accuracy, etc.), processing by the side surface of the grindstone portion 14, that is, the polishing portion 30. is necessary. Therefore, the grindstone 10 is moved in a direction perpendicular to the axial direction of the work material 38 in accordance with the axial movement amount of the work material 38, as shown by an arrow A in the figure, and the surface of the polishing section 30 has a stepped portion 36. The end face 40 is brought into surface contact.
According to the present embodiment, even in such contouring grinding, since the grinding liquid is sufficiently supplied to the side surface of the grindstone portion 14, even in high-speed contouring grinding, grinding burn is caused. Therefore, it is possible to perform high-precision processing.

On the other hand, in the contouring grinding using the conventional grindstone in which the recess 26 is not provided, the grinding liquid is not sufficiently supplied to the grinding surface, so that grinding burn is likely to occur and high-precision machining should be performed. Was difficult.

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment will be designated by the same reference numerals and the description thereof will be omitted.

FIG. 6 shows both side surfaces 2 of the outer peripheral portion 18 of the base metal 12.
It is a figure which shows the principal part of the example which provided the groove | channel 42 extended to the outer peripheral surface 24 from the center part instead of the hollow 26 in 2 and 22 (only one is shown) at equal intervals in the circumferential direction. This groove 42
For example, it is formed with a width of about 4 mm and a depth of about 3 mm,
In this embodiment, the groove 42 corresponds to a recess. Also in this embodiment, since the grooves 42 are provided at equal intervals in the circumferential direction, the grinding fluid ejected toward the side surface 22 is held in the grooves 42 and, together with the base metal 12, as in the above-described embodiments. At the same time as being rotated, it is moved to the outer peripheral side according to the centrifugal force due to the rotation of the grindstone 10 and is supplied to the outer peripheral surface of the grindstone portion 14 fixed to the outer peripheral surface 24 thereof. Therefore, even when the inner wall surface of the groove 34 is ground by the side surface of the grindstone portion 14, the grinding liquid is sufficiently supplied to the contact surface and high processing accuracy is obtained.

Moreover, since the groove 42 is also provided in contact with the inner peripheral surface of the grindstone portion 14 like the recess 26, the grinding fluid ejected toward the side surface 22 is centrifuged by the rotation of the grindstone 10. Are permeated into the grindstone portion 14 by the. Therefore, also in this embodiment, the grinding liquid is more reliably supplied to the grinding surface.

FIG. 7 shows a grindstone 1 in which a spiral groove 44, which is another example of the concave portion provided in the base metal 12, is provided.
It is a figure which shows the principal part of 0. The grooves 44 are also provided on both side surfaces 22, 22 of the base metal 12, and are formed to have a width of, for example, about 4 mm so as to be directed to the outer peripheral side in the reverse direction of the rotation direction of the grindstone 10. Even in the case of such a spiral groove 44, the inertial force generated by the rotation of the grindstone 10 causes the grinding liquid retained in the groove 44 to move in the groove 44.
Since it acts in the direction of pressing the inner wall surface of the grinding wheel, the grinding fluid is rotated along with the rotation of the grindstone 10 and is directed toward the outer peripheral surface 24 side according to the centrifugal force. And the groove 34 of the rotor (workpiece) 32
And the contact surface). That is, the recessed portion provided on the side surface 22 of the base metal 12 is not necessarily provided so as to connect the side surface 22 and the outer peripheral surface 24 like the recess 26 and the groove 42, but is provided at the outer peripheral side end portion. If so, the effect of the present invention can be obtained.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in still another mode.

For example, in the above-mentioned embodiment, the shape of the depression 26 is semicircular, but the shape is not particularly limited. For example, the shape of the grindstone 10 viewed from the side surface may be a triangle or a quadrangle, and the circumferential length (diameter in the embodiment) and depth of the recesses 26, mutual intervals, numbers, etc. It can be changed appropriately.

Further, the width, depth, interval, number and the like of the grooves 42 extending from the center side of the base metal 12 toward the outer periphery can be changed appropriately. The groove 42 does not have to be formed in the radial direction from the center side toward the outer circumference. For example, the groove 42 may intersect with the radial direction so as to face the direction opposite to the rotation direction of the grindstone 10 toward the outer circumference side. It may be formed to be straight or curved.

Further, the depressions 26, the grooves 42, etc. do not necessarily have to be formed at equal intervals, and may be provided at non-uniform intervals as long as the dynamic balance during rotation of the grindstone 10 can be maintained.

Further, in the embodiment, the recess 26 and the groove 42 are formed so as to connect the side surface 22 and the outer peripheral surface 24 of the base metal 12. However, for example, the side surface 22 has a predetermined distance from the outer peripheral side end portion. There is no problem even if they are formed at separated positions.

When the spiral groove 44 is provided on the base metal 12, the number thereof is appropriately set, and one or a plurality of grooves can be provided, and the end portion on the outer peripheral side is
It may be formed so as to be connected to the outer peripheral surface 24 of the base metal 12.

When only one of the side surfaces 22 of the grindstone 10 is brought into contact with the work material, the recess 26 and the grooves 42, 4 are formed.
The recesses such as 4 may be provided only on one side surface of the base metal 12.

Further, in the embodiment, the grindstone member 27
Was composed of a supporting portion 28 made of general abrasive grains and a polishing portion 30 made of CBN abrasive grains, which was provided on both axial sides of the grindstone 10 of the supporting portion 28. It may be formed of other superabrasive grains such as abrasive grains. Further, the entire grindstone member 27 may be made of general abrasive grains or superabrasive grains.

Further, the grindstone portion 14 may be composed of one grindstone member having an annular shape.

Although not specifically exemplified, the present invention is
Various changes can be made without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a view showing 1/4 of a side surface of a grindstone according to an embodiment of the present invention.

FIG. 2 is a view showing a cross section taken along line II-II in FIG.

3 is a view showing a cross section taken along line III-III in FIG.

4A and 4B are views showing an example of a work material machined by the grindstone of FIG. 1, in which FIG. 4A is a state before machining, FIG. 4B is a state after machining, and FIG. It is a figure which expands and shows the groove cross section of each.

FIG. 5 is a diagram illustrating a case where contouring grinding is performed using the grindstone of FIG.

FIG. 6 is a view showing an example of another concave portion formed on the side surface of the base metal of the grindstone of the present invention.

FIG. 7 is a diagram showing still another example of a recess.

[Explanation of symbols]

 10: Whetstone for groove processing (grinding stone) 12: Base metal 14: Whetstone part 22: Side face 26: Dimple (recess) 30: Polishing part (side face of whetstone part)

Claims (1)

[Claims] 1. A grinding whetstone of a type in which a grindstone portion is fixed to an outer peripheral surface of a disk-shaped base metal, and a work material is ground by a side surface of the grindstone portion. A grinding wheel, characterized in that at least an outer peripheral portion of the side surface is provided with a recess for holding the grinding liquid supplied to the side surface and rotating the same along with the rotation of the base metal.