JPH07276243A - Segment type grinding wheel - Google Patents

Abstract

PURPOSE:To smoothly supply grinding liquid so as to prevent grinding burning by providing a discharge port at every segment of a grinding wheel part, and providing a grinding liquid supply hole supplying grinding liquid to the discharge port through the interior of a base part. CONSTITUTION:In a grinding wheel 1, a metallic disc-like base part 3 is fitted to the outer circumference of a flange part composed of a fix side flange 19 having grinding wheel fitting holes 18 and a moving side flange 2, and a flat shaped grinding wheel part 17 is provided on the circumference. This grinding wheel part 17 is formed out of an inside general grinding wheel part (core part) 4 and an outside super abrasive grain grinding wheel part 5, and constituted of segments 6 divided into 24 equal parts for example. A tank-shaped grinding liquid introducing cover 16 having a prescribed volume is fitted to the outside of the flange part 2 through fitting screws 7. Grinding liquid is supplied from a nozzle 21 to the communicating liquid chamber 20 in the cover 16. Further, the chamber is communicated to discharge ports 15 formed on the grinding wheel part 17 through communicating holes 11, a liquid communicating groove 12, liquid communicating holes 13, and the like formed in the disc-like base part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new segment type grinding wheel.

[0002]

2. Description of the Related Art In recent years, for grinding hard metal materials, a superabrasive grain made of extremely hard particles such as cubic boron nitride or diamond is used as a binder,
For example, there is used a grinding wheel having a flat grindstone portion formed to have a thickness of 2 to 3 mm by bonding with a vitrified bond or a resinoid bond.

The grindstone portion of a grinding wheel using such superabrasive particles may be usually composed only of superabrasive particles or may be composed of superabrasive particles and ordinary grindstones. In the latter case, a general grindstone part called a core part made of a general grindstone is provided inside the superabrasive grindstone part usually composed of superabrasive grains, and the superabrasive grindstone part and the general grindstone part inside thereof are integrated. The grindstone portion is formed by molding.

Thus, the grindstone portion is usually formed into a segmental shape by dividing it into an arbitrary number of equal parts, for example, 12 parts or 24 parts along the outer circumference. This is because it is more economical to partially replace the superabrasive grains because they are expensive.

In grinding a material to be ground while rotating such a segment type grinding wheel, a large amount of grinding liquid is always supplied to a grinding portion, but the grinding liquid is not always sufficient and uniform. Is not supplied to the cooling effect of the work material,
The effect of removing grinding debris was insufficient and grinding burn was likely to occur on the work material.

Particularly, the side and bottom surfaces of the existing groove are ground,
When attempting to grind a new U-shaped groove, a grinding wheel having a grindstone portion having a U-shaped cross section corresponding to the groove shape is used. For example, a flat-shaped superabrasive grindstone is provided with side portions that extend both outer edges of the outer peripheral portion to form a slightly deeper superabrasive grain grindstone use surface, or similarly, the outer peripheral section has a U shape. A super-abrasive grain grindstone portion is formed, and an inner void portion (inside the U-shape) filled with a general grindstone is used as a grindstone portion, which is adhered to the base portion or the outer periphery of the core portion.
In the case of grinding with such a grinding wheel, friction on both side edge portions of the grindstone portion, that is, both side surface portions of the corners is great. Even if the grinding liquid is supplied to the relevant part, it is not always sufficiently supplied, and the cooling effect of the work material and the effect of removing the grinding dust become insufficient, so that the grinding burn easily occurs on the side surface of the corner of the work material. It was

An object of the present invention is to provide a segment type grinding wheel capable of solving such a problem and supplying a sufficient amount of grinding liquid to a grinding portion to prevent the occurrence of grinding burn.

[0008]

The present invention thus provides a segment type grinding wheel in which a disk-shaped base portion and a segment type grinding wheel portion having a flat grinding stone shape are sequentially provided on the outer circumference of a flange portion. A segment type grinding wheel is provided, in which a discharge port is provided for each segment, and a grinding liquid supply hole for supplying a grinding liquid to the discharge port is provided through the inside of the base portion.

One embodiment of the present invention shown in the drawings will be described in detail. First, the case where the discharge ports are provided on both side edge portions of the grindstone portion will be described with reference to FIGS.

FIG. 1 is a plan view of an embodiment of a grinding wheel according to the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG.
4 is a sectional view taken along line A-A of FIG. 4, FIG. 7 is a sectional view taken along line BB of FIG. 5, and FIG. FIG. 8 and FIG. 8 are side views of the grindstone portion as seen from the line CC of FIG.

In this grinding wheel 1, a metal disk-shaped base portion or base metal is attached to the outer periphery of a flange portion consisting of a fixed side flange 19 having a hole 18 for attaching a grinding wheel and a moving side flange 2, and the periphery thereof. The flat grindstone portion 17 is formed.
In this example, the disc-shaped base portion is composed of an inner base portion 3 and an outer base portion 3 ', and a grindstone portion 17 includes an inner general grindstone portion (core portion) 4 and an outer superabrasive grain grindstone portion 5. Is formed by. The grindstone portion 17 is formed of segments 6 which are equally divided into 24 in FIG. A tank-shaped grinding fluid introduction cover 16 having a fixed volume is attached to the outside of the flange portion 2 by an attachment screw 7. 8
Is a plurality of communication holes that allow the grinding fluid from the grinding fluid introduction cover to flow inside, and 9 is a flange fixing bolt.

A grinding liquid is supplied from a nozzle 21 to the liquid passing pool 20 in the cover 16.

Grinding liquid supply holes are provided inside the disk-shaped base portions 3 and 3 '. That is, an annular liquid reservoir 10 communicating with the communication hole 8 is provided in the central portion, and then a communication hole 11 and a liquid passage groove 12 are formed inside the base portion 3 and further connected to the liquid passage hole 13 inside the base portion 3 '. Further, the liquid reaches the discharge ports 15 and 15 'of the grindstone portion 17 through the liquid passage ports 14 and 14'.

In this embodiment, as shown in FIG. 8, the discharge ports 15 and 15 'are provided at both side edges of the grindstone portion 17. 4 and 5, the grindstone portion 17 is formed so that the superabrasive grain grindstone portion 5 has a U-shaped cross section, and an internal void portion (inside the U-shape) has a general grindstone 4 for cost reduction. It is filled with and is simultaneously molded, but all may be superabrasive grindstones. The liquid passage ports 14 and 14 'are obliquely connected to the corresponding discharge ports 15 and 15'. In this case, the discharge ports 15 and 15 'can be provided alternately or in a zigzag shape as shown in FIG.

There are several communicating holes 11 in the radial direction, for example, four.
On the other hand, the liquid passage groove 12 provided on the one hand and provided on the one hand in a circular shape has a semicircular or rectangular cross section. The liquid passage holes 13 are slightly thinner than the communication holes 11 and are provided at equal intervals on the circumference of each of the discharge ports 15 and 15 '. Further, the liquid passage ports 14 and 14 'are formed in a rectangular cross section extending leftward or rightward according to the positions of the corresponding discharge ports 15 and 15', and both ends thereof are connected to the discharge ports 15 and 15 '. There is.

As shown in FIG. 8, the discharge ports 15 and 15 'in this case are alternately or zigzag-shaped on both sides of the center line of the grindstone portion 17 in a zigzag pattern or opposite to each other at symmetrical positions. They are provided at equal intervals. The discharge ports 15 and 15 'are usually provided in each segment at least one or at equal intervals.

In the case of this embodiment, since a large number of discharge ports are provided at both side edges of the grindstone portion, when the square groove is ground, the grinding liquid is supplied sufficiently uniformly to the corner portion where grinding burn is likely to occur. It is possible to be good.

As described above, the metallic disc-shaped base portion is made up of two parts, the inner base portion 3 and the outer base portion 3'in this example, and is fixed by shrink fitting or the like. This is because when the segment grindstone portion 17 is directly adhered to the inner base portion 3 without the outer base portion 3 ′, the groove 12 passes through the entire circumference and the adhesion area is small and the adhesive force is weak.
4. For the discharge port 15 ', a metal disk-shaped outer base 3'which communicates with the liquid passage port 14' is used. Groove 12
When the widths of the inner base portion 3 and the grindstone portion 17 are wider than the width of the inner base portion 3, the outer base portion 3 ′ may be omitted and the grindstone portion 17 may be directly bonded to the inner base portion 3.

In still another embodiment of the present invention, the discharge port can be formed in the central portion in the width direction. Hereinafter, such an embodiment will be described with reference to FIGS.

FIGS. 9 and 10 are sectional views of the essential parts showing the grinding liquid supply holes inside the grinding wheel of this embodiment of the present invention, FIG. 11 is a sectional view taken along the line D--D of FIG. 9, and FIG. 12 is FIG. 13 is a side view of the grindstone portion viewed from the line FF in FIG. 10.

9 to 13, the same reference numerals are used for the same portions as those in FIGS. 1 to 8 for convenience. Also, the structure of the disk-shaped base and the grinding fluid supply hole inside the grindstone,
The operation is virtually the same as that of the embodiment shown in FIGS. 1 to 8, and the description thereof will be omitted. In this case as well, the discharge port 1
At least one or one set of 5, 15 'is provided for each segment at equal intervals.

In this embodiment, as seen in FIG.
The discharge ports 15 and 15 'are alternately provided in the central portion in the width direction. Correspondingly, the discharge ports 15 are formed to be offset to the left side of the center line in FIG. 9, and in FIG. 15 'is shown to be offset to the right. The part seen in FIG. 13 is the part where the grindstone is used.

[0023]

Since the present invention has the above-mentioned structure, when the grinding wheel is rotated to perform the grinding work at the grinding wheel portion, the grinding wheel portion is passed through the grinding liquid supply hole provided inside the grinding wheel. The grinding fluid can be constantly supplied to the discharge port provided in the. That is, the grinding fluid is supplied from the communication hole 8 through the liquid passage 12 to the discharge port 15 through the liquid passage hole 13 and the liquid passage port 14 inside the outer base portion 3 ′ to the grinding portion.

In addition, since the discharge ports 15 and 15 'are provided in large numbers alternately or oppositely on both side edge portions of the grindstone portion, that is, the corner portions or the center portion in the width direction, the grinding liquid is sufficiently evenly distributed in the grinding portion. By supplying it, cooling of the grinding portion and removal of grinding debris can be carried out smoothly, and the occurrence of grinding burn can be well prevented.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a grinding wheel according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG.

FIG. 4 is a sectional view of an essential part showing a grinding liquid supply hole inside a grinding wheel.

FIG. 5 is a sectional view of an essential part showing a grinding liquid supply hole inside a grinding wheel.

6 is a cross-sectional view taken along the line AA of FIG.

7 is a cross-sectional view taken along the line BB of FIG.

8 is a side view of the grindstone portion as viewed from the line C-C in FIG.

FIG. 9 is a cross-sectional view of essential parts showing a grinding fluid supply hole inside a grinding wheel according to another embodiment of the present invention.

FIG. 10 is a sectional view of an essential part showing a grinding liquid supply hole inside the grinding wheel.

11 is a cross-sectional view taken along the line DD of FIG.

12 is a cross-sectional view taken along the line EE of FIG.

13 is a side view of the grindstone portion as viewed from the line FF of FIG.

[Explanation of symbols]

 1 Grinding wheel 2 Flange part (moving side) 3.3 'Disc-shaped base 4 Core part (general grindstone part) 5 Super abrasive grain grindstone part 6,6 Segment 7 Mounting screw 8 Communication hole 9 Flange mounting bolt 10 Annular fluid Puddle 11 Communication hole 12 Liquid passage groove 13 Liquid passage hole 14 and 14 'Liquid passage port 15 and 15' Discharge port 16 Grinding liquid introduction cover 17 Grindstone part (general grindstone part 4 + superabrasive grain grindstone part 5) 18 For whetstone mounting Hole 19 Flange part (fixed side) 20 Fluid reservoir 21 Grinding fluid supply nozzle

Claims (3)

[Claims] 1. A segment type grinding wheel comprising a disc-shaped base and a segment type grindstone in which the overall shape of the grindstone is flat on the outer periphery of the flange part in order, and a discharge port is provided for each segment in the grindstone part. A segment type grinding wheel characterized in that a grinding liquid supply hole for supplying a grinding liquid to the discharge port is provided through the inside of the base portion. 2. The grinding wheel according to claim 1, wherein the discharge ports are provided alternately or oppositely on both side edge portions of the grindstone portion. 3. The grinding wheel according to claim 1, wherein the discharge ports are provided alternately in the widthwise central portion of the grinding stone portion.