JPH05162080A - Hard abrasive grain electrodeposited grinding wheel - Google Patents

Abstract

PURPOSE:To simply shape a grinding wheel with a diamond dresser or the like so as to remarkably shorten the shaping manhour by using an alundum series or corundum series grinding wheel as a base body. CONSTITUTION:An alundum series or corundum series grinding wheel of which the surface is treated with electroless nickel plating 4 by the use of palladium chloride so as to be given electrical conductivity, and a desired form is given, is set as a base body 6. A hard abrasive grain electrodeposited grinding wheel is obtained by fixedly securing hard abrasive grains 1-3 such as diamond or CBN on the surface by nickel electroplating 5. This grinding wheel is provided with fine projections and recesses on the outer circumference, but after shaping it into a desired form with a dresser and the like, the fine projections and recesses are left on the surface, and the hard abrasive grains 1-3 are fixedly secured along the projections and recesses. Then at starting grinding, at first hard abrasive grains 1 take part in grinding. When the abrasive grains on this part are worn out, the hard abrasive grains 2, 3 in the recessed parts being not taking part in grinding hitherto take part in grinding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses an alundum-based or corundum-based grindstone as a base, and imparts electroconductivity to the surface of the base to impart electroconductivity to the base. , Or CBN
The present invention relates to a hard abrasive grain electrodeposition grindstone in which hard abrasive grains such as the above are electrodeposited.

[0002]

2. Description of the Related Art In a conventional electrodeposition grindstone, a base body which is a base metal of the grindstone is composed of a metal, for example, an iron-based metal, and hard abrasive grains such as diamond and CBN are electrodeposited on the surface thereof. .. In addition, there is also an electrolytic grinding wheel which has been made commercially available by applying electroless nickel plating to an alundum type or corundum type grinding wheel which has been generally commercially available (see Japanese Patent Publication No. 48-33077). However, this is merely a grindstone intended for electrolytic grinding.

[0003]

As described above, iron-based metals are generally used for the base of hard abrasive grain electrodeposition grindstone, and hard abrasive grains are electrodeposited on the surface of the base body of the grindstone. ing. Since the base body is made of iron-based metal, when shaping the base body, the outer periphery must first be turned and then the outer periphery must be ground. Therefore, the processing time is very long. Further, since the surface of the base is flat, only one layer of hard abrasive grains can be fixed. Therefore, when grinding is performed using this grinding whetstone, as shown in FIG. 4, a normal iron-based electrodeposition grindstone has uniform hard abrasive grains fixed on the surface of the iron-based base 6a. Since 1 is electro-deposited on one layer, when the hard abrasive grains 1 on one layer are worn out, the life of the grindstone immediately becomes. Therefore, there is a problem that the life is extremely shortened. Further, the larger the grindstone, the larger the base body becomes, which is heavy and difficult to handle, and there are various problems such as being expensive.

[0004]

DISCLOSURE OF THE INVENTION The present invention is directed to an alundum system or a corundum system in which palladium chloride is used to electrolessly nickel-plat the surface of the palladium to give conductivity and a desired shape is imparted. The grindstone of No. 1 and a hard grind electrodeposition grindstone in which hard grindstones such as diamond and CBN are fixed on the surface of the grindstone by electro nickel plating, and the grindstone has a long life and is lightweight. It is what

[0005]

According to the hard abrasive grain electrodeposition grindstone according to the present invention, an alundum type or corundum type grinding wheel has fine irregularities on its outer periphery, which are shaped into a desired shape by a dresser or the like. Then, minute unevenness remains on the surface, and hard abrasive grains are fixed along the unevenness. Therefore, when grinding is started, first, the hard abrasive grains on the convex portion participate in the grinding. When the abrasive grains in this part wear, the hard abrasive grains in the recesses, which have not been involved in the grinding until now, start to grind, and this is worn, and it is possible to grind until all the abrasive grains are worn Like

[0006]

[Examples] Now, after grinding an alundum type grinding wheel into a desired shape with a dresser or the like, it is thoroughly washed with an organic solvent or the like to remove oil and fat, dust and the like, and then dried.
It was immersed in a palladium chloride solution of 000 to 1/10000 to adsorb palladium chloride to the inside of the grindstone, and then dried again.

Next, the whetstone after this pretreatment was nickel-plated with an electroless plating solution. As the film thickness of the plating, only a few microns are sufficient since it only gives conductivity. As the electroless plating solution, a high-concentration plating solution containing nickel sulfate, sodium citrate, sodium hypophosphite, or the like is used.

After completion of the nickel plating, after covering with a masking agent except for the surface on which hard abrasive grains are electrodeposited,
CBN abrasive grains (# 120/14
0) is fixed, and a predetermined amount of embedded abrasive grains (abrasive grain size of 6
(0 to 70%) was nickel-plated to form an electrodeposition grindstone.

FIG. 1 is a partial cross-sectional view of an embodiment of an electrodeposition grindstone on which hard abrasive grains of the present invention are electrodeposited. A base grindstone in which the surface of an alundum or corundum grindstone 6 is shaped with a diamond dresser. After the electroless plating layer 4 having a film thickness of several microns is formed on the surface of the substrate, hard abrasive grains (CBN abrasive grains in this embodiment) are electrodeposited. The surface of the grindstone is dressed, but minute irregularities are formed, and the abrasive grains are fixed along the minute irregularities by electro nickel plating. As shown in 1, 2, and 3, the abrasive grains are electrodeposited with numerous abrasive grains along the irregularities on the surface of the grindstone. Therefore, when the outermost abrasive grain 1 is worn, the abrasive grain 2 then becomes a cutting edge. Further, when the abrasive grains 2 wear, the cutting edges are sequentially formed so that the abrasive grains 3 become the cutting edges, and the grinding is performed. For this reason, the grinding life of the grindstone has been significantly improved.

An example of producing a hard abrasive grain electrodeposition grindstone according to the present invention will now be described. φ145 x 25 x φ76.2
The outer circumferences of the alundum-based grindstone (WA # 80) and the iron-based grindstone (S45C) having the above dimensions were shaped, and CBN abrasive grains were electrodeposited on the outer circumference by the above means. As shown in FIG. 3, the material SKH51 (HRC
Grinding the test piece 7 from 64 to 67) with a grinding wheel peripheral speed of 1
As a result of performing a surface grinding test under the conditions of 500 m / min, feed rate of 15 m / min, and depth of cut of 0.005 mm / cycle, the conventional product had an abrasive wear amount of 0.96 cm ³ and could not be cut, resulting in a life. The cutting amount at this point is 1,
It is 065 cm ³ , and when viewed from the grinding amount / abrasive wear amount (volume ratio), it is 1,065 cm ³ /0.96 cm ³ ≈
It was 1,109. On the other hand, according to the present invention, when the abrasion amount of the abrasive grains is 1.25 cm ³ , it becomes impossible to cut and the life is reached. The cutting amount at this point is 2,593 cm ³ , and when this is seen from the cutting amount / abrasive wear amount (volume ratio),
It was 2,593cm ³ /1.25cm ³ ≒ 2,075. Therefore, it can be seen that the electrodeposition grindstone according to the present invention has a life approximately twice that of the conventional iron-based electrodeposition grindstone. Moreover,
The weight is about 1/4 of that of the conventional product, which is extremely lightweight.

[0011]

[Effect] According to the electrodeposited grindstone of the present invention, since a commercially available alundum-based or corundum-based grindstone is used for the base, it can be easily shaped with a diamond dresser or the like, and can be easily shaped into a desired shape. Therefore, the number of orthopedic man-hours has been greatly reduced. Moreover, the grindstone as the base is about 1/10 of the iron-based base.
Since it is the price of, it became extremely cheap. Moreover, since the base body is an alundum type or a corundum type as described above, the weight is 1/3 to 1/5 of that of an iron type, which makes it easy to handle and makes a large electrodeposition grindstone. Is also possible. Further, after the grindstone was shaped with a diamond dresser or the like and electroless plated on the surface of minute irregularities, hard abrasive grains were fixed by electronickel plating on the surface, so that a cutting edge that became a cutting edge on the surface Even if the grains are worn, the second cutting edge and the third cutting edge can be sequentially brought into contact with each other for grinding, and the life of the grindstone is substantially doubled, which is a remarkable effect.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a hard abrasive grain electrodeposition grindstone of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a schematic diagram of grinding a test piece with an electrodeposition grindstone.

FIG. 4 is a conventional iron-based electrodeposition grindstone.

[Explanation of symbols]

1. ． ． ． ． ． ． ． Hard abrasive grains (diamond, CBN
Etc.) 4. ． ． ． ． ． ． ． Electroless plating 5. ． ． ． ． ． ． ． Electro nickel plating 6. ． ． ． ． ． ． ． Substrate 7. ． ． ． ． ． ． ． Test piece

Claims (1)

[Claims] 1. An alundum-based or corundum-based grinding whetstone which has been given electroconductivity by applying electroless nickel plating to the surface thereof using palladium chloride, and the grinding whetstone. A hard abrasive grain electrodeposition grindstone in which hard abrasive grains such as diamond and CBN are adhered to the surface by electro nickel plating.