JPS5997845A - Vitreous cutting grindstone - Google Patents

Abstract

PURPOSE:To permit the superior working efficiency for a soft material to be maintained for a long time, increase working efficiency, and reduce cost, by constituting a grindstone from glass fiber itself as grinding member. CONSTITUTION:An offset grindstone (a) is constituted by heating and press-molding, into a certain thickness and an offset form, a laminated body 2 formed by superposing a plurality of glass fiber discs 1 formed of prepreg-glass-cloth. When a material is ground by the grindstone (a), the glass fiber itself acts as grinding member, and the phenol resin into which the glass fiber is immersed acts as bonding agent for holding this glass fiber at a prescribed position. Since this glass fiber possesses a high tensile strength and a strong elasticity, this glass fiber possesses the superior durability as grinding material. Therefore, in working a soft material, the superior working efficiency is maintained, and the working efficiency can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grinding and polishing wheel, and particularly to one using glass fiber as an abrasive material.

In general, conventional rotary whetstones use abrasive grains made of hard inorganic materials as abrasive materials, and these abrasive grains are hardened with resin or other binders and molded into a predetermined shape. It performs processing such as grinding, polishing, or cutting on metals and other various materials.

However, when using the above-mentioned conventional grindstone for a special purpose, for example, when processing soft materials such as rubber cards or soft plastics, there is a problem in the use of the grindstone. There is a problem in that it tends to adhere and cause clogging, making it difficult to maintain the initial machining performance over a long period of time.

Further, the processing capacity of the above-mentioned grindstone is too large for operations such as removing rust from iron plates and removing paint without damaging the base material. Therefore, there is no other way than to use so-called papers in which abrasive grains are glued to paper or cloth, but since these have few abrasive grains, the work efficiency is low, and as a result, the cost is high.
It had the disadvantage of being sticky. In addition, it can be used as a grindstone for cleaning the edges of cut glass plates and removing joints after tile processing.It has a high working efficiency like the conventional grindstone mentioned above, and has a processing capacity suitable for the above uses. There was a strong demand for something prepared.

The present invention has been made in view of these points, and aims to provide glass fiber, which has been conventionally used as a reinforcing material for grinding wheels, to have appropriate hardness and exhibit processing characteristics not found in conventional abrasive grains. By understanding this and making use of this machining characteristic, we can maintain good machining performance over a long period of time when machining soft materials -2- by configuring a grindstone that uses the above-mentioned glass fiber itself as the abrasive material. In addition, we have improved work efficiency and reduced costs when it comes to tasks such as removing rust from iron plates and removing paint, and we have also improved the efficiency of tasks such as removing glass edges and removing joints in tile construction. The purpose is to

In order to achieve this object, the structure of the present invention is a glass fiber disk formed by making a glass M fiber into a one-piece shape or a sheet shape, or a glass fiber disk formed by stacking a plurality of glass fiber disks, or a V4 layered body formed by stacking a plurality of glass fibers, impregnated with a resin. This is a quality grinding and polishing whetstone for grinding, polishing, cutting, etc. using a glass fiber abrasive material.

Here, the resin impregnation is for holding the glass fibers so that they do not fall apart or for adhering the glass fiber disks to each other.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an offset grinding wheel a according to a first embodiment of the present invention.
The laminated body 2-3 is formed by stacking a plurality of glass fiber disks 1 made of prepreg glass cloth into an A offset shape having a predetermined thickness, and then firing the laminated body 2-3. That is, as shown in FIG. 1, first, a glass cloth (MG-430 manufactured by Asahi Fiberglass Co., Ltd.,
The density of the glass cloth is 9 pieces/1 inch in both length and width.
Approximately 50% by weight of phenol resin (Gun-ei Chemical Co., Ltd.'s Resin G P for Glass Impregnation) was added to the original glass cloth.
104), dried at about 60°C for 5 minutes to obtain a non-stick prepreg cloth, and a glass fiber disk 1.1 with an outer diameter of 100 wφ and a center hole diameter of 15 mm was punched from the prepreg cloth. Pull it out. Then, a plurality of glass fiber disks 1 obtained in this way, for example, 10 sheets,
The glass fibers are layered to form a laminate 2 so that the directions of the glass fibers are not the same, and the laminate 2 is placed in an offset mold, and the mold is heated at approximately 50° C. for approximately 30 seconds under a pressure of approximately 10-/d. -4- Offset grindstone as a vitreous grinding and polishing whetstone according to the present invention is produced by pressing and forming a molded body with a thickness of about 3.5wnn, and further firing the molded body to a maximum temperature of 180°C in an electric furnace. ? Eia is formed.

Next, to explain the function of the offset grinding wheel a of the first embodiment, when a workpiece is processed by the offset grinding wheel a, the glass atette itself acts as an abrasive, and the phenol resin impregnated into the glass fibers acts as an abrasive. acts as a binder to hold the glass in place. The above-mentioned glass fiber has high tensile strength and strong elasticity, making it highly durable as an abrasive material, and its suitable hardness makes it suitable for practical use, especially in processing soft materials such as rubber cards and soft plastics. Demonstrates excellent processing characteristics that demonstrate processing ability. In addition, instead of the pores for accommodating chips generated by machining that are found in general grindstones, the offset grindstone a has a relief section 3 which has a volume sufficiently larger than the pores due to adjacent glass fibers. 3... is formed, which makes it less prone to clogging due to adhesion of cutting chips compared to general grindstones,
As a result, the machining ability at the beginning of the work can be maintained satisfactorily over a long period of time.

-5- Figure 2 shows a flat grinding wheel according to the second embodiment of the present invention, in which case the roving cloth (manufactured by Asahi Fiberglass) is formed by knitting untwisted glass fibers in a cross shape. RL-500) was made into a prepreg cloth under the same conditions as in the first embodiment, and the outside diameter was 18 mm from the prepreg cloth.
Glass mtIf with 0w1Wlφ, center hole diameter 22+mnφ
Punch out 1 disc 4.4...

Then, the 20 glass l1i1 disks 4.4... thus obtained were stacked so that the directions of the glass fibers were not the same to form a laminate 5, and the laminate 5 was put into a mold, and the above-mentioned first embodiment The above-mentioned flat grindstone was formed by pressing under the same conditions as described above to form a thickness of about 181 m, and then firing.

In addition to the same effects as the offset grinding wheel a of the first embodiment, the flat grindstone of the second embodiment is better than the conventional paper type when performing work such as removing rust from iron plates or removing paint. It is possible to improve work efficiency and reduce costs. In addition, unlike conventional whetstones, it does not have sharp abrasive grains and is made of glass SaW.
-6- Because it comes into contact with the workpiece surface over a wide area, the contact surface pressure with the workpiece surface can be kept low, and as a result, it does not bite into the base material and does not damage the base material. . Similarly, hardened joints in tiles can be removed without damaging the tiles.

FIG. 3 shows a flat grindstone C which is the third embodiment of the present invention, in which a latent hardening agent ( boron trifluoride monoedylamine)
Epoxy resin containing (Ebikuron 950 manufactured by Dainippon Ink)
) is impregnated and dried to form a prepreg.
Glass fiber disk 6 with 1100wnφ, center hole 40φ
, 6... The 20 glass fiber disks 6,6... thus obtained were stacked to form a laminate 7, and the laminate 7 was placed in a mold and lightly pressed. 'li hat 15
The flat grindstone C is formed by firing at 0° C. to form a donut-shaped grindstone 8, and attaching an offset-shaped mounting member 9 made of glass fiber to one side of the donut-shaped grindstone 8 using an adhesive.

-7- The flat whetstone C of the third embodiment has the same effect as the flat whetstone of the second embodiment, and also acts as a binder when performing work such as edge binding of glass plates. Epoxy resin has greater elasticity than phenolic resin, which prevents the grinding surface of flat grindstone C from slightly escaping from the glass surface to be cut, thereby preventing localized large heat generation on the glass surface. , it is possible to prevent cracks from forming on the glass plate as would occur when using a conventional grindstone.

In addition, the glass fiber disk 6 used for the flat whetstone C is as follows:
When used as a glass cloth reinforcement for conventional grinding wheels,
For example, when punching a glass fiber disk with an outer diameter of 180 IImIφ for a conventional grindstone, the effective usable area of the plate material remains at 68%, and the remaining 32% is Plate-shaped materials are processed as waste by investing a large amount of money in the form of swarf, but these swarfs, which were previously discarded, can be used to obtain them, making it possible to use resources more effectively. This makes it possible to reduce costs.

-8- In the above first to third embodiments, any resin can be used as the binder to impregnate the glass [1] as long as it can adhere and fix the glass lI'ft. It is desirable to use a thermosetting resin that can be pre-pregged because it has excellent heat resistance against the frictional heat that sometimes occurs and the method for producing rice is simple. In addition, it is also possible to implement a manufacturing method in which glass fiber is placed in a mold without prepreg and resin is poured on top of it, so thermoplastic resins with excellent moldability are not necessarily required to be prepreg-compatible. You can also use Therefore, any of the phenol resins, epoxy resins, polyurethane resins, polyester resins, melamine resins, etc. that have been conventionally used as binders for grinding wheels can be used as the binder in the present invention.

Furthermore, an abrasive may be added to the resin to further enhance the processing ability.

Next, to specifically describe the effects of each of the above embodiments,
Processing tests were conducted on the above-mentioned grindstones a, b, and c under the conditions shown in Table 1 below.

-9- Table 1 First, prior to the processing test of offset grinding wheel a, as a comparative example, a protruding part of an automobile rubber tire was cut to a width of 5 I using a grinding wheel with hardness abrasive grains C, which is the lowest of the hardness among conventional offset grinding wheels.
When grinding of In111 was started over a length of 1000 mm, the grindstone became clogged around the length of 60 OIIlIIIl and could not be ground at all. On the other hand, when the offset grindstone a of the first embodiment was used, the grinding speed was slightly lower, but it was possible to grind to the end of the length 10001IIT11.

Next, when we conducted a test in which rubber rods with an outer diameter of 15+ww+φ were cut one after another under the conditions shown in Table 1, we found that the grindstone of the comparative example had 4 cuts and became unusable due to slow clogging. With the offset grindstone a of Example 1, when 10 pieces were cut, the outer diameter was only reduced by about -10-3 mm, and no clogging occurred. From these results, it can be seen that when the offset grindstone a of the first embodiment is used, rubber postcards can be processed for a long time while maintaining the initial processing ability. In addition, in the rotational destructive test, the grinding wheel of the above comparative example was 26000
-28,000 rpm r, whereas the offset grindstone a of the first example did not break even at 30,000 rpm, indicating that it had sufficient toughness and was highly safe.

Further, in the processing test using the flat grindstone of the second example, there was no biting into the base material of the flat iron plate and the automatic 11 body, and the rust removal or paint removal work could be carried out quickly. During the process, the glass fibers came apart after long use and the pumping was insufficient, so I ground the corners of the iron plate and dressed it, and was able to remove the loose glass fibers in a short time, and then try again. I was able to continue working with the same processing capacity as when I started.

Furthermore, in the machining test using the flat grindstone C of the third example,
There was no biting into the glass plate, and there were no cracks that were likely to occur when grinding with a conventional -11- grindstone, and a good finished surface could be obtained.

As explained above, according to the vitreous grinding and polishing whetstone of the present invention, a glass fiber disk formed by making glass #AM into a cloth shape or sheet shape, or a laminate made by stacking a plurality of glass fiber disks, is impregnated with resin. Because of this structure, when machining soft materials, the clearance between the glass fibers accommodates chips, allowing the machining performance to be maintained well over a long period of time, while also making it possible to maintain good machining performance for long periods of time, while also being useful for tasks such as removing rust from steel plates and removing paint. In this case, it is possible to increase work efficiency without damaging the base material, thereby reducing costs, and in addition, it is possible to perform work such as removing joints after glass edge tile construction. This can produce excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the manufacturing procedure of the offset grindstone a as the first embodiment, FIG. 2 is a diagram showing the manufacturing procedure of the flat grindstone a as the second embodiment, and FIG. 3 is a diagram showing the manufacturing procedure of the flat grindstone a as the third embodiment. This is a diagram showing the manufacturing procedure of the flat grindstone C. =12-. DESCRIPTION OF SYMBOLS 1... Glass fiber disk, 2... Laminate, 4... Glass fiber disk, 5... Laminate, 6... Glass fiber disk, 7... Laminate. -13-

Claims (1)

[Claims] (1) A vitreous grinding and polishing whetstone characterized by being impregnated with a resin in a glass fiber disk formed by making glass fiber into a cloth or sheet shape, or a laminate made by stacking a plurality of glass fiber disks.