JPH10202530A - Diamond rotary dresser and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a resistance value during dressing for prevention of vibration by forming a groove at the surface of diamond grain which is fixed, at a diamond layer, flush with or protrudingly from the surface of a bond material, and dividing the grinding surface of the diamond grain. SOLUTION: A paste brazing filler metal material is applied to a base 5, a diamond grain 1 is hand-set and is put in a furnace. After heating process, the brazing filler metal material is melted and cooled for fixing. The exposed surface of the diamond grain protrudes from the surface of bond material. Its protruding front end is made flat by truing, and laser beam is irradiated over the flat surface to form a groove 2. The cutting edge ends of respective diamond grains 1 increase to plural number, and effective number of abrasive grains also increases. To prevent the brazing filler metal material from being corroded by cutting chips, it is very effective to increase wear resistance of brazing filler metal material by including hard particle in the brazing filler metal material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diamond rotary dresser used for dressing a conventional grindstone such as WA or GC or a CBN grindstone attached to a grinder or the like with high precision.

[0002]

2. Description of the Related Art As a conventional diamond rotary dresser, a diamond rotary dresser disclosed in, for example, Japanese Patent Application Laid-Open No. 59-47162, in which diamond grains are further fixed to the outer periphery, is well known.

[0003] As another example, Japanese Patent Laid-Open Publication No. 1-21111 is disclosed.
No. 5 is known. In such a diamond rotary dresser used for dressing a conventional grindstone such as WA, GC or the like or a CBN grindstone or the like with a wide working width and high precision, the diamond grains are firmly fixed and the tip of the diamond grains is fixed. Means for improving the accuracy by truing the part to a flat surface is used.

[0004]

However, since the flatness of the diamond grains is reduced, the sharpness of the diamond rotary dresser is reduced.
There is a problem that the dressing resistance when dressing a conventional grindstone such as a GC or a CBN grindstone is large, so that vibration is generated, and the vibration adversely affects the shaping accuracy.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object to provide a diamond rotary dresser which has a low dressing resistance and can perform dressing with high accuracy and high efficiency. The first is
Grooves are formed in the diamond grains fixed to the diamond rotary dresser.

That is, a groove is formed by a laser beam or the like on the surface of a diamond grain fixed to the diamond layer of the diamond rotary dresser on the same plane as the surface of the bonding material or on the surface thereof so as to divide the abrasive surface of the diamond grain. It is. The specific features will be described in the embodiment section.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
This will be described in the section of Examples.

[0008]

FIG. 1 is a perspective view showing the external shape of a diamond dresser common to the first and second embodiments, which is a straight type having an outer diameter D of 80 mm and a diamond layer width T of 25 mm.

Embodiment 1 FIG. 2 is a schematic cross-sectional view showing a cross-sectional shape of a diamond layer in a diamond rotary dresser of Embodiment 1.
1 is a diamond grain of # 50/60 (260 to 320 μm), 2 is a groove, 3 is a nickel plating layer serving as a bonding material,
4 is a bonding layer formed of a low melting point alloy, 5 is a steel base, 6
Is a groove provided on the surface of the nickel plating layer.

The groove 2 was formed by truing the surface of the diamond layer with a diamond grindstone at a radius of 3 μm and then irradiating a laser beam under the following conditions. Machine used YAG laser Irradiation direction Tangential direction of diamond layer Output 40W The shape of the groove processed by irradiation is as follows. Groove pitch 0.5 mm screw-like groove Groove opening width 0.03-0.08 mm Groove depth 0.03 mm

In order to confirm the performance of the dresser of the first embodiment, a conventional grinding wheel attached to a horizontal axis surface grinder was used in the first embodiment.
Was dressed under the following conditions. Grinding machine Okamoto Machine Tool horizontal axis surface grinder Diamond rotary dresser Osaka Diamond drive unit SGS-50 type drive unit Conventional grindstone to be dressed Outer diameter φ300mm Width 10mm Specification WA80K Dressing condition Circumferential speed ratio 0.28 (down dress) Cutting speed 1.9mm / min Cutting amount 4mm

The resistance at the time of dressing was compared with that of a conventional diamond rotary dresser without groove processing. The dressing resistance of a conventional diamond rotary dresser without grooves is 4.0 N in the normal direction.
/ 10 mm and the tangential direction was 0.5 N / 10 mm.
On the other hand, as shown in Table 1, the dressing resistance of the diamond rotary dresser of Example 1 was 2.5 N / 10 mm in the normal direction and 0.25 N / 10 mm in the tangential direction.
Met.

[0013]

[Table 1]

As described above, the diamond rotary dresser grooved by the laser of the present invention has a resistance at the time of dressing of at least 40% to 50% as compared with the conventional product.
The dressing was reduced and smooth dressing was possible without generating vibration. The precision of the dressed whetstone was also very good.

Example 2 FIG. 3 is a schematic view of a part of a cross section showing the shape of a diamond layer in a diamond rotary dresser of Example 2, wherein 1 is a diamond grain, 2 is a groove, 5 is a base, and 7 is Ag-C.
It is a bonding material made of a u-Ti brazing material. The particle size of the diamond grains 1, the shape of the groove 2, the shape and the material of the base 5 in this Example 2 were the same as those in Example 1, except that the diamond grains 1 were directly fixed to the base 5 by a brazing material. It is.

This fixing is performed by using a paste-like brazing material on the base 5.
The diamond particles 1 are hand-set, placed in a furnace, heated to melt the brazing material, and then cooled. Therefore, in Example 1, the exposed surface of the diamond grains is almost the same as the surface of the bond material, but in the present case, the exposed surface protrudes from the surface of the bond material. The protruding tip is flattened by truing, and the flat surface is irradiated with the same laser beam as in the first embodiment to form a groove. In some cases, truing can be omitted.

As described above, this brazed diamond rotary dresser has a larger projection amount of diamond grains than the diamond rotary dresser of the first embodiment and an extremely large abrasive grain space. Is excellent in that not only is the dressing resistance low, but also clogging does not occur. In addition, the formation of the groove 2 increases the number of blade tips of each diamond grain 1 to a plurality, and increases the number of effective abrasive grains, so that both sharpness and accuracy are improved. By the way, in the case of the dressing according to the second embodiment, the required time could be shortened by about 30% or more as compared with the case of the conventional product.

In Example 2, A was used as the brazing filler metal.
The g-Cu-Ti-based activation brazing material is excellent in that it can easily and strongly adhere the diamond and the steel base metal as a base material, but its hardness is as low as about Hv100, so that the Even if the diamond grains do not wear, there is a concern that the brazing material will be eroded from the surface one after another by the contact of the swarf, eventually dropping the diamond and shortening the life of the diamond rotary dresser rapidly.

Therefore, in order to prevent the brazing material from being eroded from the cutting powder, it is very effective to include hard particles in the brazing material to increase the wear resistance of the brazing material. Hard particles contain at least one of diamond, CBN, SiC abrasives, Al203 abrasives, WC particles, etc., having a particle size equal to or less than one-half that of the diamond particles used in the rotary dresser, thereby preventing erosion. A great effect can be expected. The content ratio of these hard particles is used in the range of 10 to 50% with respect to the brazing material volume, and more preferably in the range of 30 to 50%.

That is, according to the present invention, as in the first embodiment, a nickel plating layer is formed by a reverse plating method, and a groove is formed in the nickel plating layer. It can also be carried out by providing a groove in a material made of a bonding material, but a brazing material fixed by the above-mentioned brazing material has the highest accuracy and a low dressing resistance. In addition, it can be expected that the manufacturing time can be shortened with a long life.

[0021]

As described above, according to the diamond rotary dresser of the present invention, the resistance value during dressing can be reduced, the occurrence of vibration during dressing is prevented, and the dressing accuracy is further improved. , Enables highly efficient dressing work.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external shape of a diamond rotary dresser according to an embodiment of the present invention.

FIG. 2 is a schematic partial cross-sectional view showing a cross section of a diamond layer of the diamond rotary dresser of Example 1.

FIG. 3 is a schematic partial cross-sectional view showing a cross section of a diamond layer of a diamond rotary dresser of Example 2.

[Explanation of symbols]

 Reference Signs List 1 diamond grain 2 diamond grain groove 3 nickel plating layer 4 bonding layer 5 base 6 brazing material 7 nickel plating layer groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Shimizu 2-80 Hohokucho, Sakai City, Osaka Prefecture Inside Diamond Diamond Industry Co., Ltd. (72) Inventor Kosuke Mitsui 2-80 Horikitacho, Sakai City, Osaka Osaka Osaka Inside Mondo Kogyo Co., Ltd. (72) Inventor Yoshio Kouda Inside Osaka Diamond Mondo Kogyo Co., Ltd.

Claims (7)

[Claims] 1. A diamond rotary dresser having a diamond layer formed by bonding diamond grains with a bonding material, wherein the diamond layer surface of the diamond grains is divided by grooves. 2. The diamond rotary dresser according to claim 1, wherein the surface of the diamond layer of the diamond grains protrudes from the surface of the bonding material. 3. The diamond rotary dresser according to claim 1, wherein a groove is also formed on the surface of the bonding material of the diamond layer. 4. The diamond rotary dresser according to claim 1, wherein the bonding material is formed of a brazing material or a brazing material containing hard particles in the brazing material. 5. The diamond rotary dresser according to claim 1, wherein the diamond layer surface or the protruding end of the diamond grain is formed flat by truing. 6. A groove is formed by irradiating a laser beam to a surface of a diamond layer.
The method for producing a diamond rotary dresser according to 3, 4, or 5. 7. A groove is formed by irradiating a laser beam to a diamond layer of a diamond rotary dresser whose sharpness has been reduced by use.
The method for producing a diamond rotary dresser according to 2, 3, 4 or 5.