JPH044106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll-shaped elastic polishing grindstone that is used while being rotated.

Conventional elastic abrasive grindstones include those in which abrasive grains are bound by elastic rubber, those in which abrasive grains are bound by elastic synthetic resin, those in which abrasive grain-containing binding material is foamed, or those in which abrasive grains are attached to fibers. These elastic abrasive wheels have the property of being able to conform well to the surface of the object to be polished. There is a drawback that the polishing cost is high because the grinding wheel is not sufficiently worn and the grinding wheel is worn.

In other words, with conventional elastic grinding wheels, the only way to maintain elasticity and improve grinding power is to lower the degree of bonding, and for this reason, it was thought that heavy wear was unavoidable. be.

The present invention provides an elastic grindstone that has excellent grinding properties, less wear and tear, and provides a beautiful finished surface, comprising an abrasive-containing resin layer (second layer) and an abrasive-containing elastic rubber layer (first layer). The two layers are exposed on the circumferential surface of the grindstone roll, and as the roll rotates, these two layers are brought into contact with the same part of the object to be polished alternately and at a predetermined area ratio.

In the polishing wheel of the present invention, both the first layer and the second layer have a grinding and polishing effect, but the first layer exhibits a larger buffering effect and gloss polishing effect than the second layer, and the second layer It exhibits a greater grinding effect than the layers, and because these layers appear periodically and alternately on the same polishing surface to polish, the polishing function is improved, and the feature is that no stripes appear on the finished surface.

In the present invention, not only can the quality and quantity of each bonding material and abrasive grains be freely selected and combined, but also the usage conditions or grinding It has the advantage of being able to be designed optimally according to performance, etc.

For example, by making the resin bonding layer hard and thin, it is now possible to easily remove scale from rolled steel sheets, which was difficult in the past, and to polish the surface of difficult-to-cut materials. This makes it unnecessary and contributes to pollution prevention.

Furthermore, when the elastic rubber bonding layer is made of foam and is thicker than the resin bonding layer, it is more compatible with the object to be polished, and a beautiful finished surface can be obtained.

Next, a method for manufacturing the grindstone roll of the present invention will be explained.

Knead the necessary auxiliaries for natural rubber or synthetic rubber,
Further, selected abrasive grains are kneaded and portioned to a desired thickness, and preformed into an annular shape to obtain a rubber dough sheet. (Manufacture of rubber bonding layer) The above rubber fabric sheet is placed in a predetermined mold, abrasive grains coated with synthetic resin or mixed thereon are sprinkled to a desired thickness, and molded by heating and/or pressure. . In this case, the number of laminated layers is arbitrary, and a synthetic resin binder mixed with glass fiber or synthetic or short fibers of animals and plants can also be used in combination. (Molding of the resin bonding layer) The thickness ratio of the rubber bonding layer and the resin bonding layer is determined by considering the area ratio on the roll surface of the final product, and is practically 1:2 to 2: It is 1.

The annular molded body is placed in a mold with a desired shape (or inclination) on the upper and lower surfaces, heated and pressurized to integrally form the molded body, and then secondary hardening is performed as necessary, and the outer periphery is polished and finished.

An example of the structure of the grindstone of the present invention will be explained with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rotation axis, and annular first layers 2 and second layers 3 are alternately laminated around this axis and are formed into a wave shape in the circumferential direction. This corrugation may be formed in each layer or may be imparted during the overall molding.

In this case, the height of the waves (height difference) is preferably equal to or greater than the thickness of each layer.

In the case shown in FIG. 2, a first layer and a second layer of disks or annular bodies are laminated so as to be inclined in a certain direction with respect to the axis 1.

In the structure shown in FIG. 3, the first layer 2 and the second layer 3 are formed as fan-shaped segments 2' and 3', and these are arranged adjacent to each other alternately in the circumferential direction.

Example: 100 parts of polychloroprene, 4 parts of MgO, 5 parts of ZnO,
Mix in 1 part of accelerator, further 10 parts of chromium oxide,
After mixing 300 parts of WA#80 abrasive grains, the mixture was divided into 1 mm sheets. This sheet has an outer diameter of 300φ and an inner diameter of
Punched into a 240φ ring shape.

100 parts of WA#80 abrasive grains were mixed with 6 parts of liquid phenolic resin, and then coated with 18 parts of powdered phenolic resin.

Next, put the rubber dough into a ring-shaped preforming mold with a depth of 3 mm, spread powdered abrasive grains coated with resin evenly on it to a thickness of 2 mm, and then
A sheet was placed and pressed at 90° C. for 1 minute to obtain a ring-shaped, sandwich-shaped preformed product with a thickness of 3 mm.

A mold with an outer diameter of 305φ, an inner diameter of 200φ, and a height of 70mm has a radial wave pattern with a depth of 2mm on the bottom and top surfaces.
Apply adhesive to the core metal (200φ x 200φ x 70t) and set it, stack the 24 ring-shaped molded products described above, and add cushion rubber (after vulcanization) between the core metal and the core metal (200φ×200φ×70t).
The dough (with a hardness of 90°) was inserted and molded at 150°C for 30 minutes under a pressure of 70 tons.

After removing from the mold, heat in a heating oven at 180℃ for 1 hour 2
Next curing was performed and final polishing was performed to obtain a product.

The two elastic polishing wheels of the present invention manufactured in this way were connected and attached to a polishing machine, and the oxide film and rolling scratches on the hot-rolled coil of ordinary mild steel were polished off.

Line speed 28m/min, grinding wheel peripheral speed 1500m/
I was able to polish approximately 13,000m with a min. removal allowance of 10μ. With a grinding ratio of approximately 5, the durability was several times that of conventional elastic abrasive wheels, and results sufficient for practical use were obtained.

[Brief explanation of drawings]

A and B in FIGS. 1 to 3 are a schematic front view and a side view, respectively, of the roll grindstone of the present invention.

Claims (1)

[Claims] 1. In a roll-shaped elastic polishing whetstone having a rotating shaft at the center, the whetstone roll has a first layer in which abrasive grains are bonded with elastic rubber, and a second layer in which abrasive grains are bonded with synthetic resin on the circumferential surface of the roll. The first layer and the second layer are stacked at different positions in the axial direction so as to have a predetermined area ratio in both the circumferential direction and the axial direction, and the first layer and the second layer are arranged at the predetermined area ratio on the rotating surface of the grindstone roll. A rotary elastic polishing grindstone characterized by appearing alternately with an area ratio of .