JPH0220387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a grinding wheel base made of a metal with low specific gravity such as aluminum or a plastic material, and on the outer peripheral surface of the grinding wheel base, hard abrasive grains are electrodeposited in a single layer on the surface of the bent steel band. This invention relates to a cylindrical grinding wheel formed by fixing a band-shaped metal plate.

In conventional electrodeposited grindstones for cylindrical grinding, a metal made of nickel is directly electrodeposited on the outer peripheral surface of the grindstone base, which is usually made of steel, and hard abrasive grains such as diamond or cubic boron nitride are added to the electrodeposited metal layer. It is made by fixing it in a partially embedded state.

Steel is used as the whetstone base because it is easy to electrodeposit nickel or the like and provides high adhesion strength. However, if the whetstone base is made of steel, the weight of the whetstone base itself increases, making it more than three times as heavy as a normal vitrified whetstone, and if the whetstone has a large diameter, it will be difficult to handle the whetstone. In addition, if the precipitation method is used to electrodeposit hard abrasive grains on the outer periphery of the whetstone, a large electrolytic bath capable of immersing the entire whetstone will be required, and the larger the diameter of the whetstone, the larger the electrolytic bath becomes. It requires a large amount of electrolyte, which is disadvantageous. Furthermore, even if abrasive grains are sprinkled on the outer circumferential surface of the whetstone base in the electrolyte, the abrasive grains will only land on a part of the circumference, so if the abrasive grains are electrodeposited partially, the whetstone base will be rotated. Unless indexing, abrasive grain dispersion, and electrodeposition are repeated in sequence, abrasive grains cannot be electrodeposited all over the circumference, which not only causes unevenness in the abrasive grain layer but also wastes a lot of time.

Another method is to mix abrasive grains into an electrolytic solution and apply a current while in suspension for electrodeposition, but in this case, a large amount of expensive hard abrasive grains is required, and very little of the abrasive grains mixed in the electrolytic solution is used. This is disadvantageous in that only a portion of the abrasive grains are electrodeposited, and most of the abrasive grains cannot be used efficiently.

In view of these points, the present invention includes a disc-shaped grinding wheel base made of a metal with low specific gravity such as aluminum or plastic material, and a steel band made of low carbon steel. and a bendable metal band plate with hard abrasive grains such as diamond or cubic boron nitride electrodeposited in a single layer along with an electrodeposited metal layer of nickel. The purpose is to reduce the weight of the whetstone base, make it easier to handle the whetstone, and increase the holding power of the hard abrasive grains formed by electrodeposition.

Embodiments of the present invention will be described below based on the drawings.

FIGS. 1 and 2 show a cylindrical grinding wheel 10 as a completed product. Reference numeral 11 denotes a disk-shaped grindstone base, with a mounting hole 11a drilled in the center and its cylindrical outer peripheral surface 11b. are concentrically finished with high precision. The material of this grindstone base 11 is as follows:
Since abrasive grains are not directly electrodeposited on the whetstone base 11, iron or any material other than iron can be used. However, if the weight increases, handling of the whetstone becomes inconvenient, so it is preferable to use a metal with a low specific gravity such as aluminum, or a plastic material other than metal. Reference numeral 12 denotes a band-shaped metal plate wrapped around the outer peripheral surface of the whetstone base 11 and bonded with an adhesive 13.
It has a thin plate shape that can be bent to fit well and closely fit the shape of the outer circumferential surface of the whetstone base 11, and has a length that matches the length of the outer circumferential surface of the whetstone base 11. Hard abrasive grains 14 such as diamond or cubic boron nitride are electrodeposited on the outer peripheral surface of this band-shaped metal plate 12, and most of each abrasive grain is embedded in an electrodeposited metal layer 15 such as nickel, and the tip of each abrasive grain is The cutting edge slightly protrudes from the electrodeposited metal layer 15 and has a single abrasive grain layer 16 formed thereon.
Nickel is suitable for the electrodeposited metal layer 15 because it has excellent adhesion between the hard abrasive grains 14 and the electrodeposited metal and the strength of the electrodeposited metal, and it greatly increases the holding power of the hard abrasive grains to the strip metal plate 12. This can prevent the abrasive grains from falling off and extend the life of the whetstone. A suitable material for the band-shaped metal plate 12 is low carbon steel, which allows easy electrodeposition of nickel and has high adhesion strength, and commercially available steel bands can be used. In order to increase the adhesion strength between the steel strip and the nickel electrodeposition layer, it is preferable to form a thin copper plating layer on the steel strip as an underlayer.

Next, a method of manufacturing the cylindrical grinding wheel 10 having the above structure will be described.

The steps for forming the band-shaped metal plate 12 having the single-layer abrasive grain layer 16 are as follows. First, the band-shaped metal plate 12 as a material is made of highly flexible band steel with a thickness of about 0.2 mm, cut into an appropriate length according to the outer circumference of the grinding wheel base, and used as a base layer for electrodeposition. Copper plated. Although this copper plating base layer is not necessarily required, when the carbon content of the steel strip is relatively high, it is effective for increasing the adhesion strength between the electrodeposited layer and the steel strip. After forming an insulating film to prevent electrodeposition on the entire back surface of the steel strip, the steel strip is placed in an almost horizontal state with the surface to be electrodeposited facing upward in an electrolytic bath 20 filled with an electrolytic solution, as shown in FIG. Hard abrasive grains 14 of diamond or cubic boron nitride are uniformly scattered and settled on the upper surface of the steel strip to form a single layer of abrasive grains. The steel strip is connected to the cathode of a DC power source 21, and the nickel plate 22 placed in the electrolytic cell 20 is connected to the anode and energized to electrodeposit a single layer of precipitated abrasive grains on the surface of the steel strip. When the abrasive grains in contact with the surface of the steel band are fixed by the electrodeposited metal layer and do not move, the steel band is vibrated in the electrolytic bath 20 to shake off the abrasive grains that have settled on the abrasive grains. After that, electricity continues to be applied, and the electrodeposited metal layer embeds most of the abrasive grains in contact with the surface of the steel strip, so that the cutting edge of each abrasive grain slightly protrudes from the surface of the electrodeposited metal layer 15, as shown in FIG. Electrodeposit until it reaches the desired state. As a result, a single layer of hard abrasive grains that does not require dressing and does not fall off even when upper grinding resistance is applied is formed on the surface of the steel strip.

The steel strip is taken out from the electrolytic bath 20 and washed to remove the insulating film on the back surface.

Next, a process for fixing the steel band on which the abrasive grain layer 16 has been formed to the outer circumferential surface of the disc-shaped grindstone base 11 will be described. The outer circumferential surface of the grindstone base 11 is finished in advance to a high degree of roundness, and the steel strip is cut to match the length of the outer circumferential surface. At the time of cutting, the seam when wrapped around the outer peripheral surface of the whetstone base 11 is tilted at a predetermined angle so that it is not parallel to the axis as shown in FIG. It is best to cut it into a shape where the seams form a triangular convex and concave chevron shape that interlock with each other. Furthermore, as the grindstone base 11 becomes larger, a longer steel strip is required, so a steel strip with a length obtained by dividing the outer circumferential length of the grindstone base into two or more equal parts may be added.
As a first example of such a steel band fixing process, as shown in FIG. Wrap the steel strip so that the adhesive is completely attached and tighten until the adhesive is completely cured. Particular care must be taken to avoid creating a step at the seam of the edge of the steel strip.

As a second embodiment of the fixing process, as shown in FIG. 6, both ends of the steel strip are brought together and electron beam welded to form an annular body 12a with the abrasive grain layer 16 on the outside. Note that a predetermined interference between the inner diameter of the annular body 12a and the outer diameter of the grindstone base 11 is provided in advance at room temperature. The annular body 12a is heated to expand by an amount equal to or more than the tightening margin, and then press-fitted into the outer circumferential surface of the grindstone base 11. As the annular body 12a cools and contracts, the steel band is fixed to the grindstone base. It is also effective to use a thermosetting adhesive for such shrink fitting, if necessary.

In the third embodiment of the fixing process, the steel strip is fixed into an annular body 12a having a predetermined interference as in the second embodiment.
The whetstone base 11 is made of aluminum, is cooled and shrunk to more than the tightening margin, and the annular body 12a is press-fitted into the outer peripheral surface of the whetstone base 11. The whetstone base 11 expands as the temperature rises to room temperature, and the steel band is fixed to the whetstone base 11. An adhesive can also be used in combination with such a cold fit, if necessary.

According to the present invention, a disc-shaped grinding wheel base made of a metal with low specific gravity such as aluminum or plastic material, and a steel band made of low carbon steel are formed, and a copper plating layer is formed as a base layer on this steel band. Furthermore, it consists of an electrodeposited metal layer made of nickel and a bendable metal band plate on which hard abrasive grains such as diamond or cubic boron nitride are electrodeposited in a single layer, and this band metal plate is attached to the outer peripheral surface of the grinding wheel base. Because it is wrapped and fixed, it is possible to use metals such as aluminum or plastic materials with low specific gravity as the whetstone base, even though it is an electroplated whetstone, and it has a significantly lower specific gravity compared to conventional electroplated whetstones. It becomes possible to reduce the weight. Therefore, even if the grindstone has a large diameter, it can be easily handled, and even if the single layer of abrasive grains wears out, the wheel base can be recycled by removing the band-shaped metal plate, which is economical. There is an effect.

Moreover, the electrodeposition of hard abrasive grains can be carried out on a single metal strip or by rolling out the metal strip, making it easier and more efficient to form a uniform electrodeposited grindstone layer than with conventional electrodeposited grindstones. This has the effect of mass production and cost reduction.

In addition, when electrodepositing hard abrasive grains, copper plating was used as the base layer on the steel strip and nickel was used as the electrodeposited metal layer, so it was possible to increase the adhesion strength between the steel strip and the nickel electrodeposition layer, and the hard abrasive It has excellent adhesion between the grains and the electrodeposited metal layer, can increase the strength of the electrodeposited metal layer, and has the effect of increasing the holding power of hard abrasive grains.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a cylindrical grinding wheel with a partial cross section, FIG. 2 is a sectional view taken along the arrow in FIG. An enlarged cross-sectional view of the layer, Fig. 4 shows the state of electrodeposition of hard abrasive grains, Fig. 5 shows the state of fixing the band-shaped metal plate to the grinding wheel base with adhesive, and Fig. 6 shows the state of the band-shaped metal plate being fixed to the grinding wheel base with adhesive. FIGS. 7 and 8 are diagrams showing a state in which a ring-shaped body is welded and then fixed by press-fitting, and FIGS. 7 and 8 are diagrams showing the shape of the edge seam of a band-shaped metal plate. 11... Grinding wheel base, 12... Band-shaped metal plate, 13
... Adhesive, 14 ... Hard abrasive grain, 15 ... Electrodeposited metal layer, 16 ... Abrasive grain layer, 20 ... Electrolytic cell, 21 ...
...DC power supply, 22...nickel board.

Claims (1)

[Claims] 1. A disc-shaped whetstone base made of a metal with low specific gravity such as aluminum or plastic material, and a low carbon steel strip, with a copper plating layer formed as a base layer on this steel strip, and then made of nickel. Consisting of an electrodeposited metal layer and a bendable metal band plate on which hard abrasive grains such as diamond or cubic boron nitride are electrodeposited in a single layer, this band metal plate is wound and fixed around the outer peripheral surface of the grinding wheel base. A cylindrical grinding wheel featuring: