JPH10118938A - Super abrasive grain grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously perform grinding with excellent cutting quality, and lengthen the service life of a grinding wheel by protrusively fixing a super abrasive grain to a single layer by a metallic binding material by a brazing material containing a hard particle composed of one or more kinds among a super abrasive grain having a grain diameter not more than 1/2 of a grain diameter of a super abrasive grain, an abrasive grain and a hard compound. SOLUTION: A diamond particle 1 of #100 (an average grain diameter of 149μm) is fixed to a single layer on an outer periphery of steel base metal 2 by an activating brazing material 3 composed of Ag7-Cu-28-Ti2. A hard particle 4 composed of a diamond particle of #400 is contained by 25 capacity % in the brazing material 3. The hard particle is a mixture of one kind to two or more kinds such as a super abrasive grain, an abrasive grain or a hard compound, and a grain diameter is set not more than at least 1/2 of a grain diameter of the super abrasive grain from binding power and grinding resistance. Therefore, mesh-clogging is not caused, and the cutting quality is excellent, and stable work can be performed, and the service life of a grinding wheel can be lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to diamond, CB
The present invention relates to a grindstone using superabrasive grains such as N, particularly to a grindstone used for grinding carbon, plastic, ceramic, glasses, building materials, and the like.

[0002]

2. Description of the Related Art As a grindstone of this type, superabrasive grains are made of Ni,
Electrodeposited grindstone fixed on the substrate by electroplating such as Cr, or super abrasive grains, as disclosed in Japanese Patent Publication No. 55-22194, are projected and fixed on the substrate with a brazing material. A material having a protruding amount and a strong fixing force seems to be suitable.

[0003]

However, in the above-mentioned electrodeposited grinding wheel, the thickness of the electrodeposited layer is required to be at least 1/2 of the particle diameter of the superabrasive grains in order to retain the superabrasive grains. Protrusion amount becomes small. Therefore, the abrasive space that becomes the chip pocket is narrow, and when processing materials such as spectacle lenses, plastics, ceramics, carbon, and building materials with high efficiency (high removal efficiency), clogging occurs due to the large amount of chips generated and grinding. Is difficult to continue.

On the other hand, the brazing-type grindstone has a large protruding amount of superabrasive grains, and there is little trouble in grinding due to clogging.
As this brazing material, for example, a brazing material that can easily and strongly fix the superabrasive grains and the steel base metal as the base material, such as an activated brazing material of an Ag—Cu—Ti system, is used.

[0005] By the way, the hardness of this kind of brazing material is HV100.
Low in degree. Therefore, even if superabrasive grains (diamond Knoop hardness of about 7000, CBN Knoop hardness of about 4700) do not suffer from abrasion during the grinding process, the brazing material is worn from the surface one after another by the contact of chips such as ceramics and carbon. This causes the superabrasive grains to fall off, which causes the life of the grinding wheel to be shortened rapidly.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is characterized in that it is made of a brazing material by providing any of the following or redundantly. The purpose is to improve the wear resistance of the surface of the metal bonding material or the bonding material layer, prevent the metal bonding material from being worn, and improve the grinding performance and life of the grindstone.

(1) A metal binder for projecting and fixing superabrasive grains to one layer is selected from superabrasive grains, abrasive grains, and hard compounds having a grain size of 1/2 or less of the grain size of the superabrasive grains. A brazing material containing the above hard particles is used.

A hard metal plating layer or a metal plating layer containing hard particles (1) is formed on the surface of the binder of (1).

A hard metal plating layer or a metal plating layer containing the hard particles described in the above (1) is formed on the surface of the brazing material for protruding and fixing the superabrasive grains.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment will be described in the following section.

[0011]

【Example】

(Example 1) FIG. 1 is a longitudinal sectional side view for explaining an outline of a grinding stone of Example 1, wherein 1 is a diamond particle of # 100 (average particle size: 149 μm).
It is further fixed by the activated brazing material 3 made of 0-Cu28-Ti2.

The brazing material 3 contains about 25% by volume of hard particles 4 composed of # 400 diamond grains. For fixing, a paste-like brazing material is applied on the base metal 2, The diamond particles 1 were arranged thereon and heated in vacuum. The diameter D of the whetstone is 150 mm and the thickness T is 1 m
m, mounting hole diameter 40 mm.

When the Al ₂ O ₃ -based ceramic was ground and cut by the grinding wheel of the above embodiment, it was sharp and clogged without clogging.
Stable processing could be performed. The grinding conditions were as follows, and as shown in Table 1, the life was much longer than that of the comparative example not containing the hard particles 4. Grinding wheel peripheral speed 1600m / mm Feed speed 3m / mm Cutting depth 20mm / pass method Dry type

[0014]

[Table 1]

(Example 2) A brazing filler metal 3 in Example 1 was changed in the following manner, and the same test was carried out. As shown in Table 1, Example 2 was followed by Example 1. Good results were obtained.

As shown in FIG. 2, Ag70-Cu28-T for projecting and fixing the diamond particles 1 to the outer peripheral end of the base metal 2
A hard metal plating layer 5 was formed on the outer surface of the activated brazing material 3 made of i2 by electroplating Cr. The thickness of the hard metal plating layer is about 20 μm.

(Embodiment 3) As shown in FIG. 3, instead of the hard metal plating layer 5 in FIG. 2, a metal plating layer 6 containing hard particles composed of WC particles having a particle size of about 15 μm during Ni electroplating. Was formed. When this was subjected to the same test, the life was as long as that of Example 1 as shown in Table 1.

The hard metal plating layer 5 and the metal plating layer 6 in the second and third embodiments may be formed on the surface of the brazing material containing the hard particles 4 in the first embodiment. Although the base metal 2 is shown as being made of steel, it can be made of another material such as a cemented carbide.

The hard particles may include one or more of super-abrasive grains, abrasive grains or carbides such as WC, oxides such as Al ₂ O ₃ , and other nitrides and silicides. A mixture can be used, and its content is preferably large as long as the required bonding strength of the brazing material or plating is not impaired, and is preferably in the range of 50% to 10% by volume%. If the particle size of the hard particles is large, the bonding strength of the brazing material and the plating may be impaired and the grinding resistance may be increased. Therefore, it is necessary that the particle size is at least 1/2 or less of the particle size of the superabrasive particles.

The particle size and the degree of concentration of the super-abrasive particles may be appropriately selected depending on the material to be ground and the purpose of processing. It is preferable that the abrasive grains are made coarse, and the projecting fixed abrasive grains are each independently provided with an abrasive grain interval.

[0021]

The grinding wheel of the present invention can continuously grind a material with a large amount of swarf by high-efficiency grinding, such as ceramics, carbon, plastics, building materials, non-ferrous metals, and rubber. . And the life of the whetstone is long.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view for explaining an outline of a grindstone according to a first embodiment.

FIG. 2 is a schematic view of a cross section of a polishing surface illustrating a brazing portion of superabrasive grains in Example 2.

FIG. 3 is a schematic view of a cross section of a polishing surface for explaining a brazing portion of superabrasive grains of Example 3.

[Explanation of symbols]

 1. Diamond particles 2. 2. Steel base metal Brazing material 4. 4. Hard particles in brazing material Hard metal plating layer 6. Metal plating layer D Diameter of grindstone T Thickness of grindstone H Diameter of mounting hole of grindstone

Claims (3)

[Claims] 1. An outer edge (outer peripheral side surface and / or end surface) of a base metal
A grindstone having superabrasive grains projected and fixed to one layer by a metal binder, wherein the metal binder comprises a superabrasive grain having a particle size equal to or less than half the particle size of the fixed superabrasive grains, A superabrasive grindstone, characterized in that it is a brazing material containing one or more hard particles of grains and hard compounds. 2. A hard metal plating layer on a surface of a metal binder,
Alternatively, a metal plating layer containing one or more hard particles of a superabrasive grain, an abrasive grain, and a hard compound having a particle diameter of 1/2 or less of the particle diameter of the fixed superabrasive grain is formed. Claim 1
The described super-abrasive grindstone. 3. An outer edge (outer peripheral side surface and / or end surface) of the base metal.
A grindstone in which superabrasive grains are protruded and fixed to one layer by a brazing material, and the surface of the brazing material has a hard metal plating layer or a particle size of １ ／ or less of the particle size of the fixed superabrasive particles. Super abrasive,
A super-abrasive grinding wheel characterized by forming a metal plating layer containing one or more hard particles of abrasive grains and hard compounds.