JP2003048159A - Diamond dresser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diamond dresser using a columnar diamond and having such structure that the columnar diamond is hardly broken and long service life. SOLUTION: The columnar diamond is held by a first holding layer and a second holding layer in the longitudinal direction, and the first holding layer and the second holding layer face mutually to hold the columnar diamond so as to nip it. As a method for manufacturing the diamond dresser using the columnar diamond, the columnar diamond is temporarily fixed on the first holding layer and is assembled in a mold. Next, metallic powders are filled on the first holding layer and the columnar diamond in the mold, and sintering is performed by pressurizing to manufacture a sintered body, which is used as a tip part of the dresser.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diamond dresser used for modifying (dressing) a grinding wheel, and more particularly to a diamond dresser using columnar diamond.

[0002]

2. Description of the Related Art Conventionally, as a single-stone type diamond dresser, a granular natural diamond fixed with a sintered alloy has been generally used. However, due to variations in quality due to nature and the size of the diamond embedded in the dressing surface is not constant, the dressing action area increases extremely even with a small amount of wear, and the dressing is caused by the change in the cross-sectional shape of the granular diamond. As the conditions change,
There was a problem that the dressing function became impossible due to the falling of the granular diamond itself, and the dressing surface of the grinding wheel was roughened and a good dressing surface could not be obtained.

As a means for solving such problems and stabilizing the quality and improving the sustainability of the performance, for example, Japanese Patent Laid-Open No. 200-200
There is a dresser described in JP-A-0-167769. This dresser embeds and fixes columnar diamond in sintered metal,
It is made by joining a sintered metal to a shank. In this dresser, the above-mentioned columnar diamond is sintered while being pressed by metal powder while being pressed, and a cylindrical sintered body in which the columnar diamond is arranged in the center is used as the tip of the dresser.

[0004]

By the way, the diameter of the grinding wheel to be dressed may be extremely small depending on the user (for example, about φ5), and in order to apply it to such a grinding wheel, a thinner columnar diamond should be used. Need to use. The size of the columnar diamond used is about 0.1 to 1.0 mm, and among them, those having a cross section of about 0.3 mm square are mainly used.

However, in the method of sintering while pressing the columnar diamond so as to enclose it with the metal powder as described above, pressure is also applied to the columnar diamond from all directions when it is pressed, so that the columnar diamond inside the sintered body is pressed. There was a problem that the diamond was cracked or broken. As the dresser is used, its tip is worn away and its length is reduced, and at the same time, the length of the columnar diamond embedded in the dresser is also reduced. When using a dresser having the above problems, the length of the columnar diamond is broken as the dresser wears and becomes shorter,
Finally, the holding force of the sintered metal could not withstand use, and the tip side of the columnar diamond was missing.
This causes problems such as poor dressing accuracy, rapid wear of the dresser, and short life.

The present invention solves the above problems, and proposes a diamond dresser in which a diamond is less likely to be broken in a dresser using columnar diamond, and a part of the diamond is less likely to be lost during use, and a method for manufacturing the same. Is.

[0007]

A first feature of the diamond dresser of the present invention is that a columnar diamond and a first holding layer for holding the columnar diamond in the longitudinal direction are provided.
A second bonding member formed so as to face the first holding layer.
The holding layer of

The second feature is that one of the first holding layer and the second holding layer is made of a sintered body and the other is made of a metal material.

A third feature is that both the first holding layer and the second holding layer are made of a sintered body.

The diamond dresser manufacturing method of the present invention is characterized in that in the method of manufacturing a diamond dresser using columnar diamond, i) a step of temporarily fixing the columnar diamond on the first holding layer, ii) the above A step of incorporating the first holding layer into the mold, and iii) a step of filling the first holding layer and the columnar diamond in the mold with metal powder, and then sintering while applying pressure.

The second feature is that the columnar diamond is temporarily fixed on the first holding layer with an adhesive.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the diamond dresser of the present invention, columnar diamond is held by a holding layer, and the holding layer is joined to a shank. The holding layer is composed of a first holding layer and a second holding layer, and the columnar diamond has 2
It is joined so as to be sandwiched between two holding layers. The surface of the columnar diamond in the longitudinal direction is bonded to the first holding layer and the second holding layer and is in a close contact state. With such a structure, the second holding layer can be formed in a state in which the columnar diamond is closely adhered to and supported by the first holding layer, so that the columnar diamond can be formed when the second holding layer is formed. Since the diamond is supported by the first holding layer even when pressure is applied to the diamond, the problem that the columnar diamond is broken can be prevented.

The columnar diamond used in the diamond dresser of the present invention has a cross-sectional size of about 0.2 m.
It is effective when the size is from m square or more to 1.0 mm square or less. If the size is smaller than 0.2 mm square, the columnar diamond itself is likely to be broken, which causes a practical problem. Further, if it is larger than 1.0 mm square, the strength of the columnar diamond itself increases, and the problem of breaking when pressing the metal powder is unlikely to occur.

The first holding layer can be easily processed by using, for example, S45C which is an iron-based metal material. Since this retaining layer needs to be similarly worn according to the wear of the columnar diamond, it is suitable that it is not too hard. If necessary, by providing a groove for fitting the columnar diamond, the columnar diamond can be easily positioned and the positional accuracy is improved. The shape of this groove is processed into a V shape or a concave shape, but it is appropriately selected according to the specifications of the diamond dresser. From the viewpoint of preventing the columnar diamond from being broken when the metal powder is pressed, it is preferably V-shaped. This is because, in the case of the concave groove, the columnar diamond cannot be stably temporarily fixed when the width of the columnar diamond is different from that of the groove. Further, in the case of the V shape, the surface of the columnar diamond is about 45 degrees with respect to the pressing direction, and it is difficult to directly receive the pressing force. The first holding layer may be a sintered alloy instead of a metal material. In this case, columnar diamond is placed on a sintered alloy that has been sintered into a predetermined shape in advance, and the sintered alloy is further formed on this. When the groove is not formed on the first holding layer, it is preferable to temporarily fix the columnar diamond with an adhesive.
By doing so, the adhesive acts as a cushioning material at the time of temporary fixing, and the columnar diamond becomes more difficult to break even if pressure is applied when forming the second holding layer.

The second holding layer is made of a sintered body. The columnar diamond is temporarily fixed to the first holding layer, the metal powder is filled on the first holding layer so as to cover the columnar diamond, and then the second holding is easily performed by sintering while applying pressure. Layers can be formed. As the metal powder, a component containing mainly iron, copper and tin is suitable. As a specific component, iron is 70% or more and 90% or less, the rest is copper and tin, and the ratio of copper to tin is 60 to 85% for copper and 15 to 40 for tin.
It is desirable to set it as%. If necessary, add 0.5
It is also effective to add ~ 2%. With such a component, the holding layer needs to be worn according to the wear of the columnar diamond, and since the sintering temperature can be set to a relatively low temperature, it is possible to prevent the deterioration of the diamond. Further, the iron contained in the metal powder and the columnar diamond are slightly reacted to improve the bonding strength with the columnar diamond sintered body. In addition, since a liquid phase component is generated during sintering and permeates into a minute gap between the columnar diamond and the first holding layer to contribute to the retention of the columnar diamond,
The columnar diamond is more difficult to break. As described above, since the columnar diamond is supported by the first holding layer, the problem that the columnar diamond is broken does not occur even if pressure is applied when the second holding layer is sintered.

The holding layer holding the columnar diamond as described above is joined to a shank and processed into a predetermined shape to form a diamond dresser. The example of the joining method is not particularly limited, and brazing or the like is suitable. Further, the tip of the dresser is processed into a conical shape, a roof shape or the like depending on the application.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A diamond dresser according to the present invention is shown in FIG. 1, a schematic view of a dresser tip portion is shown in FIGS. 2 and 3, and a conventional dresser tip portion is shown in FIG.

Example 1 In order to manufacture the diamond dresser of the present invention, first, S45C, which is an iron-based metal material, was used as the first holding layer 2 and processed into a plate shape. A V-shaped notch groove was formed on this surface at a position where the columnar diamond 1 was fixed, and the first holding layer 2 was plated with copper in order to enhance the bonding strength with the second holding layer 3. The columnar diamond 1 was temporarily fixed to the cutout groove with an adhesive, the first holding layer 2 to which the columnar diamond 1 was temporarily fixed was incorporated into a carbon mold, and metal powder was filled to cover the columnar diamond to form a mold. 80% iron, 14% copper,
6% tin was used. This was sintered by pressing with a hot pressing method to form a second holding layer 3 and bonded to the first holding layer 2 and the columnar diamond 1. After that, the carbon mold was decomposed, an integrated body of the first holding layer 2 and the second holding layer 3 was taken out, and this was brazed to the shank as the tip of the dresser. Finally, the tip was cut into a conical shape and processed into a dresser shape.

(Embodiment 2) As in Embodiment 1, first of all,
The holding layer 2 was made of an iron-based metal material S45C and was processed into a plate shape. The surface of the first holding layer 2 was plated with copper in order to increase the bonding strength with the second holding layer 3, but no groove was formed. The columnar diamond 1 was temporarily fixed to this surface with an adhesive, the first holding layer 2 temporarily fixing the columnar diamond 1 was incorporated into a carbon mold, and metal powder was filled so as to cover the columnar diamond to form a mold. The metal powder components used were 80% iron, 14% copper, and 6% tin. This was sintered by pressing with a hot pressing method to form a second holding layer 3 and bonded to the first holding layer 2 and the columnar diamond 1. After that, the carbon mold was decomposed, an integrated body of the first holding layer 2 and the second holding layer 3 was taken out, and this was brazed to the shank as the tip of the dresser. Finally, the tip was cut into a conical shape and processed into a dresser shape.

(Example 3) Iron 8 was used as the first holding layer 2.
A metal powder of 0%, 14% of copper, and 6% of tin was filled in a predetermined mold and sintered by a hot pressing method to manufacture a plate-shaped product. A V-shaped cutout groove was formed on the surface of the first holding layer 2. The columnar diamond 1 was temporarily fixed to the cutout groove with an adhesive, the first holding layer 2 to which the columnar diamond 1 was temporarily fixed was incorporated into a carbon mold, and metal powder was filled to cover the columnar diamond to form a mold. The components of this metal powder are also 80% iron, 14% copper, and 6% tin as in the first holding layer 2.
% Was used. This was sintered under pressure by a hot pressing method in the same manner as in Example 1 to form the second holding layer 3 and joined to the first holding layer 2 and the columnar diamond 1. After that, the carbon type is decomposed and the first holding layer 2
Then, the integrated body of the second holding layer 3 was taken out, and this was brazed to the shank as the tip of the dresser. Finally, the tip was cut into a conical shape and processed into a dresser shape.

(Comparative Example) As a comparative example, a conventional diamond dresser was manufactured as follows. First, a carbon mold was filled with a metal powder, a columnar diamond 1 was placed on the carbon mold, and the metal powder was further filled on the pillar to form a carbon mold. The components of the metal powder were the same as those used in Examples 1 and 2, and used were 80% iron, 14% copper, and 6% tin. This was sintered while being pressed by the hot press method, and an integrated body of the sintered body 5 and the columnar diamond 1 was manufactured. The carbon mold was disassembled, this integrated body was taken out, and this was brazed to the shank as the tip of the dresser. Finally, the tip was cut into a conical shape and processed into a dresser shape.

As the columnar diamond 1 used in the diamond dresser of the present invention and the comparative example, a thick film diamond synthesized by the vapor phase synthesis method was cut and used. This columnar diamond is commercially available as a disc-shaped substrate (mother disk) cut with a laser or the like, and this is referred to as columnar diamond 1. The columnar diamond 1 had a cross section of about 0.3 mm square and was used after being processed to have a length of 5 mm.

A dressing experiment of a grindstone was conducted using the diamond dresser manufactured as described above. The conditions of use were as follows. Grindstone type: GC grindstone # 80 Grindstone size: φ50-5W Grindstone rotation speed: 20000 rpm (3000 m / mi
n. ) Feed rate: 600 mm / min. (0.03 mm / r
ev) Depth of cut: 0.02 mm / pass x 2 pass

The results of dressing under the above conditions are shown in Table 1.

[0025]

[Table 1]

In the diamond dresser of the present invention, none of the columnar diamonds were broken and chipped, and the average number of times of use was about 16,000, which was stable.
On the other hand, in the conventional diamond dresser, some columnar diamonds were partially broken, and some were missing when the dresser was worn, and the number of times of use was 1/5 of that of Example 1.
Some were even better.

In Examples 1 and 2 and Example 3, the number of times of use tended to be longer in Example 3. This is because the tendency of the dressing performance to decrease in Example 3 was less likely to occur, and the reason why it is less likely to decrease is considered as follows. That is, if dressing is continued, the area in which the first holding layer and the second holding layer contact the whetstone to be dressed increases as the columnar diamond wears. At this time, when the whole holding layer is a sintered alloy as in Example 3, the holding layer is easily worn and the dressing performance is unlikely to deteriorate, but as in Examples 1 and 2, S45C is added to the first holding layer. It is considered that the use of the above causes the holding layer to be less likely to wear and the dressing performance to deteriorate.

In the present embodiment, the type having one columnar diamond is exemplified, but it is also applicable to the type having a plurality of stones arranged in a line. In particular, depending on how the columnar diamonds are arranged, as shown in FIGS. 4A and 4B, a V-shaped groove is formed on the fixed surface of the columnar diamond of the first holding layer, or a smooth surface having no groove is formed. A fixing method such as fixing with an adhesive can be appropriately selected.

[0029]

As described above, in the diamond dresser of the present invention, the columnar diamonds are joined by the first holding layer and the second holding layer, so that they are supported by the first holding layer. The second holding layer can be formed and the columnar diamond is prevented from breaking.

[Brief description of drawings]

FIG. 1 is a view showing a diamond dresser of the present invention, (a) is a front view and (b) is a side view.

FIG. 2 is an explanatory view showing an example of a tip end portion of the diamond dresser of the present invention.

FIG. 3 is an explanatory view showing another example of the tip portion of the diamond dresser of the present invention.

FIG. 4 is an explanatory view showing still another example of the tip end portion of the diamond dresser of the present invention.

FIG. 5 is an explanatory view showing a tip portion of a conventional diamond dresser.

[Explanation of symbols]

1 pillar diamond 2 First holding layer 3 Second holding layer 4 shank 5 Sintered body

Claims (5)

[Claims] 1. A columnar diamond, a first holding layer for holding the columnar diamond in a longitudinal direction, and a second holding layer bonded so as to face the first holding layer.
Diamond dresser consisting of a holding layer. 2. The diamond dresser according to claim 1, wherein one of the first holding layer and the second holding layer is made of a sintered body, and the other is made of a metal material. 3. The diamond dresser according to claim 1, wherein both the first holding layer and the second holding layer are made of a sintered body. 4. A method of manufacturing a diamond dresser using columnar diamond, comprising: i) temporarily fixing the columnar diamond on the first holding layer; ii) incorporating the first holding layer into a mold; iii. ) A step of filling a metal powder on the first holding layer and the columnar diamond in the mold, and then sintering while applying pressure, and a method of manufacturing a diamond dresser. 5. The method of manufacturing a diamond dresser according to claim 4, wherein the columnar diamond is temporarily fixed on the first holding layer by an adhesive.