JPH10329029A - Electrodepositioning super grain grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent super grains on an electrodepositioning super grain grinding wheel from falling and to prolong its life. SOLUTION: This electrodepositioning super grinding grain grinding wheel has large size super grinding grains 4 of 100 μm or more average diameter stuck on the surface of the grinding wheel base metal 1 in a single layer by means of metal plating 2 and small size super grinding grains 5 are stuck in a single layer on the metal plated surface in the gap between the large grain super grinding grains in a single layer, while the protruding ends of the large size super grinding grains 4 and the small size super grinding grains 5 are approximately in a line. The grinding grain rate of the large size super grinding grains 4 stuck on the grinding wheel base metal 1 is 40% to 80% and the average grain diameter of the small size super grinding grains 5 is preferable to be 20% to 50% of the average diameter of the large size super grinding grains 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeposited superabrasive grindstone used for grinding ferrite, silicon, glass, ceramics, metal materials, resins, rubbers and the like.

[0002]

2. Description of the Related Art In producing an electrodeposited superabrasive grindstone, a method of fixing superabrasive grains to a base metal of a grindstone employs a plating technique. The base metal is immersed in a plating solution to serve as a cathode, and superabrasive grains are placed on the base metal to perform plating. Normally, nickel plating is used for plating, and when electricity is supplied, nickel plating is deposited on a base metal avoiding superabrasive grains (diamond, CBN), which are insulators, and is deposited so as to fill gaps between the superabrasive grains. When the deposition thickness of the nickel plating becomes 50% or more of the particle diameter of the superabrasive grains, the nickel plating becomes a state in which the superabrasive grains are firmly fixed. Therefore, when the deposition thickness of the nickel plating exceeds 50% of the particle size of the superabrasive grains, the nickel plating is terminated and the superabrasive grains are more firmly fixed to the base metal if the base metal is removed from the plating solution. The finished electrodeposited superabrasive grindstone is completed. The electrodeposited superabrasive grindstone produced in this way has a greater holding force for the superabrasive grains than the resin-bonded, metal-bonded, and vitrified-bonded superabrasive grindstones. Since the height is high, the volume of the chip pocket is large, the chip discharge is smooth, the clogging is small, and the sharpness is excellent.

[0003] In addition, the method of producing an electrodeposited superabrasive grindstone is to fix superabrasive grains to a base metal by plating. One of the major features is that it can produce a complete whetstone. By taking advantage of this feature, electrodeposited superabrasive grindstones are used for most of the superabrasive grindstones for total pattern grinding of ferrite, samarium cobalt, neodymium magnets, ceramics, glass, rubber, and the like. Recently, after polishing superabrasive grains to a base metal by plating, grinding the protruding ends of the superabrasive grains with a diamond whetstone and aligning the heights of the protruding ends of the superabrasive grains to grind gears etc. We have also established a highly accurate electrodeposition superabrasive grinding wheel manufacturing technology.

[0004] As described above, the electrodeposited superabrasive grindstone has a large tip pocket volume due to the high height of the protruding end of the superabrasive grains, and can smoothly discharge chips. Grinding of materials such as resin, metal bond, vitrified bond, etc., which are not able to be discharged smoothly and are clogged with superabrasive grindstones such as rubber, resin, FRP, and semi-fired ceramic It is a great feature that it can be applied to all.

[0005]

However, the conventional electrodeposited superabrasive grindstone has the feature that the sharpness is extremely good as compared with resin bond, metal bond, vitrified bond, etc. It is a structure only lined up on the surface of the base metal. In particular, a superabrasive grindstone having a particle diameter of 100 μm or more is often applied to grinding under relatively severe grinding conditions, that is, a relatively high material removal rate, and is plated by cutting powder generated during grinding. But easy to retreat. When the plating recedes, the superabrasive drops off one after another,
There is a problem that the life of the electrodeposited superabrasive grindstone is short because the sharpness is reduced and the ability to grind is completely lost.

As a technique for preventing the superabrasive grains from falling off,
For example, Japanese Patent Laid-Open Publication No. Hei 6-114739 discloses a technique in which superabrasive grains having an average particle diameter of 50 μm or more are fixed to a single layer by plating, and then covered with plating containing hard particles having an average particle diameter of 5 μm or less. However, even with this, the retreat of the plating by the cutting powder was fast, and it was not enough to prevent the superabrasive grains from falling off.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. That is, the retreat of the plating holding the superabrasive grains is prevented, the superabrasive grains are prevented from falling off, and the life of the electrodeposited superabrasive grindstone is extended. The feature is that the average particle size is 100μ
The super-abrasive grains of m or more are fixed to the surface of the grindstone base by plating, and the super-abrasive grains of the small grains are further plated by plating on the plating surface portion of the gap between the large super-abrasive grains fixed to that layer. That is, the protruding ends of the large superabrasive grains and the small superabrasive grains are substantially aligned. The abrasive ratio of the large superabrasive particles fixed to the surface of the grindstone base is 40% or more and 80% or less, and the average particle size of the small superabrasive particles is 20% or more of the average particle size of the large superabrasive particles. The plating thickness is preferably 50% or less, and the total thickness of the plating is more preferably 80% or less of the large superabrasive grains.

[0008] Large super-abrasive grains mainly contribute to the grinding process. Therefore, the abrasive ratio of large superabrasives needs to be at least 40%. However, if the abrasive grain ratio exceeds 80%, the space for adhering small superabrasive grains decreases, which is not preferable. Although varying depending on the grinding conditions and the workpiece, the best result is obtained when the abrasive ratio of large superabrasives is about 70%.

The large superabrasive grains are fixed by plating having a thickness of about 50% of the grain size. Since the most prominent edge of the small superabrasive grain to be fixed is almost the same as the protruding end of the large superabrasive grain, which is most effective in preventing the retreat of the plating due to the cutting powder, the average grain size of the small superabrasive grain is 20% to 50% of the average particle size of super abrasive
%. More preferably, it is in the range of 40% to 50%.

[0010] The thickness of the entire plating is preferably 80% or less of the large superabrasive grains, since it is necessary to consider the securing of the chip pocket necessary for discharging the cutting powder.

[0011]

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

[0012]

【Example】

(Example 1) A straight type (1A1 type) electrodeposited superabrasive grindstone having an outer diameter of 200 mm and a width of 20 mm was manufactured, and the effect of the present invention was confirmed by a grinding test.

First, diamond abrasive grains having a grain size of # 80 (having a grain size of 180 μm) were fixed to a steel base metal by nickel plating. Here, the deposition thickness of nickel plating is about 90
μm, and the height of the protruding end of the diamond abrasive is about 90 μm from the surface of the nickel plating.

Further, a grain size #
200 (diameter: 80 μm) diamond abrasive grains were fixed to one layer by nickel plating to produce an electrodeposited superabrasive grinding wheel of the present invention. Here, the deposition thickness of nickel plating is about 40μ.
m, and the height of the protruding end of the diamond abrasive is about 40 μm from the surface of the nickel plating.

Next, in order to confirm the performance of the electrodeposited superabrasive grain of Example 1, conventional diamond abrasive grains having a grain size of # 80 (having a grain size of 180 μm) were fixed to a steel base metal by nickel plating. A comparative experiment was performed with a single-layer electrodeposited superabrasive grindstone (Comparative Example 1). The details of the experiment are shown below. Grain size of Example 1 # 80 + # 200 Grain size of Comparative Example 1 # 80 Workpiece Soda glass Machine Grinding center (VKC
55) Grinding wheel peripheral speed 60m / sec Cutting depth 1mm Feeding speed 3m / min Grinding fluid JIS W2 2% aqueous solution

As a result of the experiment, the life of the electrodeposited superabrasive grindstone of Example 1 was improved by about 30% as compared with Comparative Example 1. Then, the grinding resistance and the surface roughness were equivalent to Comparative Example 1.

(Embodiment 2) As in Embodiment 1, the outer diameter Φ2
A straight type (1A1 type) electrodeposited superabrasive grindstone having a thickness of 00 mm and a width of 20 mm was manufactured, and the effect of the present invention was confirmed by a grinding test.

First, diamond abrasive grains having a grain size of # 60 (having a grain size of 250 μm) were further fixed to a steel base metal by nickel plating. Here, the deposition thickness of nickel plating is about 13
0 μm, and the height of the protruding end of the diamond abrasive is about 120 μm from the surface of the nickel plating.

Further, the surface of the nickel plating has a grain size of #
120 (diameter: 120 μm) diamond abrasive grains were fixed to one layer by nickel plating to produce an electrodeposited superabrasive grinding wheel of the present invention. Here, the deposition thickness of nickel plating is about 60
μm, and the height of the protruding end of the diamond abrasive is about 60 μm from the surface of the nickel plating.

Next, in order to confirm the performance of the electrodeposited superabrasive grindstone of Example 2, conventional diamond abrasive grains having a grain size of # 60 (having a grain size of 250 μm) were fixed to a steel base metal by nickel plating. A comparative experiment was performed with a single-layer electrodeposited superabrasive grindstone (Comparative Example 2). The details of the experiment are shown below. Grain size of Example 2 # 60 + # 120 Grain size of Comparative Example 2 # 60 Workpiece Soda glass Machine Grinding center (VKC
55) Grinding wheel peripheral speed 60m / sec Cutting depth 1mm Feeding speed 5m / min Grinding fluid JIS W2 2% aqueous solution

As a result of the experiment, the life of the electrodeposited superabrasive grindstone of Example 2 was improved by about 40% as compared with Comparative Example 2. The grinding resistance and the surface roughness were equivalent to those of Comparative Example 2.

[0021]

As described above, the electrodeposited superabrasive grindstone of the present invention has a greater effect of preventing the retreating of the plating holding the superabrasive grains than the conventional single-layer grindstone. It is very effective for prolonging the life of the electrodeposited superabrasive grindstone with less abrasive particles falling off. In particular, the great effect is obtained in the grinding of hard and brittle materials.

[Brief description of the drawings]

FIG. 1 is an enlarged schematic sectional view showing a superabrasive layer of an electrodeposited superabrasive grindstone of Example 1.

FIG. 2 is a schematic cross-sectional view showing a full-type electrodeposited superabrasive grindstone of another embodiment.

FIG. 3 is a schematic cross-sectional view showing an electrodeposited superabrasive grindstone for cutting or grooving according to another embodiment.

FIG. 4 is a schematic sectional view showing a full-type electrodeposited superabrasive grindstone of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whetstone base metal 2 Plating 3 Plating 4 Large grain superabrasive grain 5 Small grain superabrasive grain 6, 9, 12 Wheelstone base metal 7, 10, 13 Large grain superabrasive grain 8, 11, 14 Small grain superabrasive grain

Claims (3)

[Claims] 1. An electroplated superabrasive grindstone having superabrasive grains fixed to the surface of a grindstone base by plating, wherein large superabrasive grains having an average particle size of 100 μm or more are further plated on the grindstone base metal by plating. Small-grain superabrasives are fixed to the plating surface portion of the gap between the large-grain superabrasives that are fixed and further fixed on one layer by plating, and the protruding ends of the large-grain superabrasives and the small-grain superabrasives are approximately aligned. An electrodeposited superabrasive grinding wheel. 2. The method according to claim 1, wherein the abrasive ratio of the large superabrasive particles fixed to the surface of the grinding wheel base is 40% or more and 80% or less, and the average particle size of the small superabrasive particles is the average particle size of the large superabrasive particles. 20% or more of the diameter 50
%. The electrodeposited superabrasive stone according to claim 1, wherein the amount is not more than%. 3. The method according to claim 1, wherein the total thickness of the plating is not more than 80% of the average particle diameter of the large superabrasive grains, and the plating is used for grinding hard and brittle materials. 2. An electrodeposited superabrasive grindstone as described in 1. above.