JP2001071270A - Rotary grindstone for grinding soft material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the production efficiency without impairing the working accuracy even in use for a long period by forming plural grooves on an outer peripheral surface, and electro-depositing the super-abrasive grain on top faces among grooves. SOLUTION: Ninety-six in total, of grooves 7 of a width of approximately 5 mm of cross sectional semi-circle are formed on an outer peripheral surface 6 of a grinder body 4 obliquely to an axis X-X and the circumferential direction of the outer peripheral surface 6 at an angle of approximately 45 degree to both directions. The super-hard abrasive grain such as diamond particles or cubic boron nitride(CBN) or the like is firmly fixed to top faces 8 of crests of approximately 2 mm width among grooves 7 by the electro-deposition to form an abrasive grain layer 9. By applying the electro-deposition of the super- hard abrasive grain and the light-weight grinder body 4, a rotating speed can be increased to 4000/minute from conventional 2000/minute, which improves the productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to soft rollers such as a developing roller, a paper feeding roller, a charging roller, a platen roller, a fixing roller, and a transfer roller used in office equipment such as a copying machine, a computer printer, and a facsimile. The present invention relates to a rotary grindstone for soft material grinding for finishing.

[0002]

2. Description of the Related Art A soft roller of this kind is used for solid rubber such as synthetic rubber such as butadiene rubber and styrene-bradiene copolymer rubber, as a reinforcing agent and a conductive agent, a curing agent such as carbon black, a curing accelerator, and a softening agent. Etc., or a liquid curable mixture such as polyether or polyester and isocyanate, carbon black, or a foam obtained by mixing a gas such as a foaming agent or air with such a mixture. Hardness 60 or less 3
It is a soft material of about 0.

[0003] To finish such a soft roller,
A slide grinding method in which a narrow rotating grinding wheel (1) as shown in FIG. 6 is moved in the axial direction with respect to a workpiece, that is, a soft roller (2) to be worked, or as shown in FIG. A full-width plunge-type grinding method is used in which the entire width of the soft roller (2) is finished at a stroke without moving the wide grinding wheel (3) in the width direction. Conventionally, a vitrified grindstone using alumina-based or silicon carbide-based abrasive grains has been widely used for such grinding.

[0004]

The above-mentioned grinding of a soft material is easy. In many cases, air bubbles are provided to prevent clogging due to grinding dust. In the initial stage of grinding, the bubbles are effective, but thereafter, on the contrary, the bubbles on the surface of the grinding stone (for example, there is also one having a porosity of 70%)
In addition, there is a problem that grinding dust of the ground soft material is clogged and hinders subsequent grinding, thereby lowering the processing accuracy, making it difficult to remove at the time of grinding, and inferior in workability and production efficiency. .

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it difficult for grinding debris of a soft material to be clogged and can be easily removed even if it is clogged. It is another object of the present invention to provide a soft material grinding wheel for improving production efficiency.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) A rotating grindstone for grinding a soft material used for finishing an outer peripheral surface of a soft roller or the like, having a plurality of grooves on an outer peripheral surface, and an ultra-high hardness grinding wheel on a top surface between the grooves. Electrodeposit the grains.

(2) In the above item (1), the abrasive grains are diamond powder.

(3) In the above item (1), the abrasive grains are cubic boron nitride powder.

(4) In any one of the above items (1) to (3), the direction of the groove provided on the outer peripheral surface is oblique to the circumferential direction.

(5) In any one of the above items (1) to (3), the direction of the groove provided on the outer peripheral surface is the circumferential direction.

(6) In any one of the above items (1) to (5), the cross-sectional shape of the groove is substantially semicircular.

(7) In any one of the above items (1) to (5), the cross-sectional shape of the groove is a deep cut slit shape.

(8) In any one of the above items (1) to (7), the width of the grindstone is made smaller than the entire width of the soft roller to be machined, and the grinder is used for a table slide type or grindstone slide type grinder. It can be used.

(9) In the above item (8), the end on the side that enters the soft roller to be processed is tapered.

(10) In any one of the above items (1) to (7), the width of the grindstone is at least as long as the entire width of the soft roller to be worked, and the grindstone is used for a non-movable rotary grindstone grinder. I will get it.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a rotary grinding wheel for soft material grinding according to the present invention shown in FIGS. 1 and 2 has a width 50 used for a table slide type or a grinding wheel slide type cutting method.
a narrow whetstone (1) of about mm, and the whetstone body (4)
Is made of an aluminum light alloy, which is lightweight, and further reduced in weight by forming recesses 5 for thinning on both sides of a portion close to the outer periphery.

A plurality of semicircular grooves (7) having a width of about 5 mm and having a width of about 5 mm are formed on the outer peripheral surface (6) of the grindstone body (4).
In the illustrated example, a total of 96 holes are formed at an angle of approximately 45 degrees with respect to the circumferential direction of the outer peripheral surface (6). 2 between this groove (7) and groove (7)
Ultra-hard abrasive grains such as diamond grains or cubic boron nitride (CBN) are firmly fixed by electrodeposition on the top surface (8) of the peak having a width of about mm to form an abrasive layer (9). Have been.
This situation is shown enlarged in FIG.

In addition, during the electrodeposition, the ultra-high hardness abrasive grains
Even if it is fixed inside, there is no practical problem. Since the electrodeposition of the ultra-hard abrasive grains and the adoption of the lightweight grindstone main body (4), the number of revolutions can be increased from about 2000 m / min to about 4000 m / min to improve the productivity.

The ratio of the top surface (8) to the entire outer peripheral surface (6) is preferably less than 50%.

FIG. 3 shows a second embodiment of the present invention.
This soft material grinding rotary grinder (3) has a length of 250 to 300 which is almost equal to the length of the soft roller in order to grind the entire width of a soft roller (not shown) for grinding the outer peripheral surface at a stretch.
It is a grindstone for plunge grinding with a width of mm.

Also in this embodiment, the grindstone main body (not shown) is made of a lightweight aluminum light alloy, and ultra-high hardness abrasive grains such as diamond and CBN are fixed to the surface thereof by electrodeposition. Also in this case, the groove (7) is formed obliquely with respect to the axis or the circumferential direction. Whetstone (3)
Rotates and moves back and forth, but does not move in parallel with the soft roller.

Below the grindstone (3), a nozzle (10) is provided adjacent to the grindstone (3), and high-pressure water supplied from a high-pressure hose (11) connected to the nozzle (10) is supplied to the nozzle (10). By spraying from 10) onto the surface of the grindstone (3), grinding debris clogging the groove (7), grinding debris caught on the abrasive layer (8) and the like are strongly removed.

In a third embodiment of the present invention shown in FIGS. 4 and 5, a grinding wheel (1) is formed by the same grinding wheel slide type narrow width as the first embodiment shown in FIGS. There are things. In the case of this embodiment, the outer peripheral surface of the end portion on the traveling direction side of the grinding wheel body (4) made of aluminum light alloy is formed as a tapered portion (12) having a tapered shape, and the groove (7) has a considerably deep slit. It is cut into a shape.

These grooves (7) are formed as annular grooves perpendicular to the axis XX, that is, oriented in the circumferential direction. Top surface
In (8), an ultra-high hardness abrasive grain layer (9) including the top surface of the tapered portion (12) is formed.

As shown in FIG. 5, the corners of the top surface (8) and the groove (7) are chamfered and rounded, so that the corners of the abrasive layer (9) do not project. It is.

Although not shown, the third embodiment is similar to the first embodiment except that the groove (7) is directed obliquely to the axis XX or the circumferential direction. You can also.

[0027]

According to the first aspect of the present invention, since the conventional grindstone having a high porosity contains many air bubbles wider than the opening due to its structure, grinding dust is removed from the air hole. While it is difficult to remove and clogging, the grooves are not easily clogged with grinding chips, and even if clogged, they are easily removed by the action of centrifugal force and injection of high-pressure water. In addition, since ultra-high hardness abrasives are durable and strongly adhered by electrodeposition, processing accuracy does not decrease even after long-term use, and production efficiency is significantly improved compared to conventional ones. Can be.

According to the second and third aspects of the present invention, the hardness of the abrasive grains can be increased to enhance the durability.

According to the present invention, the cutting chips accumulated in the groove are pushed in the axial direction of the grindstone along the groove by the cutting chips newly entering the groove, and are discharged from the end face of the grinding stone. Therefore, the groove is not clogged. Also, the cutting chips in the groove can be easily removed by centrifugal force or high-pressure water during rotation of the grindstone.

According to the fifth aspect of the present invention, the cutting chips accumulated in the groove are pushed in the circumferential direction of the grindstone by the cutting chips newly entering the groove, and at a portion not in contact with the work, It is discharged from the groove by centrifugal force or the like.

According to the sixth aspect of the present invention, the grinding chips accumulated in the groove are easily removed, and the grinding chips are easily removed only by the centrifugal force.

According to the seventh aspect of the present invention, the grinding dust is not immediately clogged, and a good grinding action can always be obtained by using high-pressure water injection or the like.

According to the eighth aspect of the present invention, the grinding wheel can be made lightweight and capable of rotating at a high speed.

According to the ninth aspect of the present invention, when the rotary grindstone enters, the soft roller can be smoothly and gradually finished from one end thereof to a regular size.

According to the tenth aspect of the present invention, since the weight is not large as in the conventional wide vitrified rotary grindstone and is relatively light despite the wide width, the strength of the grindstone shaft is required. In addition, the number of rotations can be increased, and the production efficiency can be increased while maintaining the durability.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention by vertically cutting an upper half thereof.

FIG. 2 is an enlarged longitudinal sectional view of a main part, similarly.

FIG. 3 is a longitudinal sectional front view of a lower part of a second embodiment of the present invention.

FIG. 4 is a front view showing a third embodiment of the present invention by vertically cutting an upper half.

FIG. 5 is an enlarged longitudinal sectional view of a main part, similarly.

FIG. 6 is a schematic view illustrating the operation of a grinding wheel slide type grinding machine.

FIG. 7 is a schematic view illustrating the operation of a full width plunge type grinding machine.

[Explanation of symbols]

 (1) Grinding grindstone (2) Soft roller (3) Grinding grindstone (4) Grinding stone body (5) Reducing recess (6) Outer peripheral surface (7) Groove (8) Top surface (9) Abrasive grain Layer (10) Nozzle (11) High pressure hose (12) Tapered surface

Claims (10)

[Claims] A rotating grindstone for grinding a soft material used for finishing an outer peripheral surface of a soft roller or the like, comprising a plurality of grooves on an outer peripheral surface, and a super-high surface on a top surface between the grooves. Rotating whetstone for soft material grinding by electrodepositing hardness abrasive grains. 2. The rotating grindstone according to claim 1, wherein the abrasive grains are diamond powder. 3. The rotating grindstone for soft material grinding according to claim 1, wherein the abrasive grains are cubic boron nitride powder. 4. The grinding wheel for soft material grinding according to claim 1, wherein the direction of the groove provided on the outer peripheral surface is oblique to the circumferential direction. 5. The rotating grindstone for soft material grinding according to claim 1, wherein the direction of the groove provided on the outer peripheral surface is a circumferential direction. 6. The rotating grindstone for soft material grinding according to claim 1, wherein the cross-sectional shape of the groove is substantially semicircular. 7. The rotating grindstone for soft material grinding according to claim 1, wherein the cross-sectional shape of the groove is a deep cut slit shape. 8. The grinding machine according to claim 1, wherein the width of the grinding wheel is smaller than the entire width of the soft roller to be processed, and the grinding wheel can be used for a table slide type or a grinding wheel slide type grinding machine.
The rotating grindstone for soft material grinding according to any one of claims 1 to 7. 9. The grinding wheel for soft material grinding according to claim 8, wherein an end portion on a side entering the soft roller to be processed is tapered. 10. The grinding wheel according to claim 1, wherein the width of the grinding wheel is at least as long as the entire width of the soft roller to be processed, and the grinding wheel can be used for a non-movable rotary grinding wheel grinding machine. Rotary whetstone for soft material grinding.