JP2002210661A - Brush-like grinding wheel, and deburring and polishing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush-like grinding wheel capable of adequately performing deburring and polishing work made of non-ferrous metal composed of magnesium, magnesium alloy, aluminum, aluminum alloy, copper, or copper alloy, and a deburring and polishing method. SOLUTION: In this brush-like grinding wheel 1, a plurality of striped bodies 2 that are impregnated with binder resin and cured are banded with a collective thread comprising a plurality of alumina filaments. The work W made of non- ferrous metal composed of magnesium, magnesium alloy, aluminum, aluminum alloy, copper, or copper alloy is deburred and polished by free ends 5 of the plurality of striped bodies 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush-like grindstone for deburring and polishing, and to a deburring and polishing method using the brush-like grindstone.

[0002]

2. Description of the Related Art Plastic screen frames and cases of portable telephones and notebook personal computers have been used. However, for the purpose of shielding against electromagnetic waves and securing strength, magnesium molded products and aluminum die-cast products are used. Goods are being used. To manufacture a screen frame or case from such a molded product, it is necessary to perform deburring and surface polishing after molding, and as a tool for performing such processing, conventionally, it was made of brass or the like. Wire brushes and nylon filament brushes containing abrasive grains are used.

[0003]

However, a wire brush made of brass or the like or a nylon filament brush containing abrasive grains has a low polishing ability, and efficiently removes a workpiece such as a magnesium molded product or an aluminum die cast product. There is a problem that removal and polishing cannot be performed. There is also a problem that deburring and polishing of a copper alloy work cannot be performed efficiently.

[0004] In view of the above problems, the object of the present invention is to:
An object of the present invention is to provide a brush-like grindstone capable of suitably performing deburring and polishing of a non-ferrous metal work made of magnesium, a magnesium alloy, aluminum, an aluminum alloy, copper, or a copper alloy, and a deburring and polishing method. .

[0005]

In order to solve the above-mentioned problems, a brush-like grindstone according to the present invention is a linear body obtained by impregnating a resin into a set yarn composed of a plurality of alumina long fibers and curing the resin. A plurality of wires are bound, and the free end of the linear body moves relative to a non-ferrous metal work made of magnesium, a magnesium alloy, aluminum, an aluminum alloy, copper, or a copper alloy, so that Deburring and polishing are performed.

That is, in the deburring and polishing method according to the present invention, a linear body obtained by impregnating and hardening a resin into a set yarn composed of a plurality of alumina filaments or a brush-like grindstone in which a plurality of the filaments are bound is free. The end is moved relative to a non-ferrous metal work made of magnesium, a magnesium alloy, aluminum, an aluminum alloy, copper, or a copper alloy, thereby performing deburring and polishing on the work.

In the present invention, since the linear body constituting the brush-like grindstone is obtained by impregnating and hardening a binder resin into aggregate yarn of alumina long fiber, a wire brush made of brass or the like or a nylon containing abrasive grains is used. Higher hardness and stiffer than filament brush. Therefore, the ability to cut and polish the work is high, so that the work can be efficiently deburred and polished. In addition, alumina long fiber is magnesium, magnesium alloy, aluminum,
It has a hardness suitable for deburring and polishing non-ferrous metal workpieces made of aluminum alloy, copper, copper alloy, etc., and while processing these materials, the linear body itself It wears and new surfaces are exposed. As a result, these materials can be deburred and polished without clogging. That is, in order to suitably deburr and polish the work, it is not necessary that the brush-shaped grindstone is harder, but it is necessary that the hardness of the work and the brush-shaped grindstone be balanced. Brush-like whetstone according to the present invention, magnesium, magnesium alloy, aluminum, aluminum alloy,
Such a balance of hardness is good between a work made of a non-ferrous metal such as copper and a copper alloy. Therefore, these works can be efficiently deburred and polished for a long period of time, and the finish is good.

[0008] In the brush-like grindstone of the present invention, in the linear body, the set yarn generally extends straight and the twist is not applied to the set yarn. It may be. By adding such a twist, the rigidity of the linear body is further strengthened, so that deburring and polishing can be performed efficiently on non-ferrous metal workpieces such as magnesium molded products, aluminum die cast products, and copper alloy products. it can.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A brush-like grindstone for deburring and polishing to which the present invention is applied and a deburring and polishing method using the brush-like grindstone will be described with reference to the drawings.

(Structure of Brush Whetstone) FIGS. 1 and 2
1 is a perspective view showing an example of a brush-like grindstone to which the present invention is applied, and an explanatory diagram showing an example of a deburring and polishing method using the brush-like grindstone.

In FIG. 1, a brush-like grindstone 1 to which the present invention is applied is obtained by bundling a plurality of filaments 2 obtained by impregnating and hardening a binder resin with aggregated filaments of alumina long fibers. As a collective yarn, for example, a fiber diameter of 8 to 50 μm
And 250 to 3000 filaments of alumina, and the diameter of the aggregate yarn is 0.1 mm to 2 mm.

[0012] As the linear body 2, usually, the aggregate yarn without twist is used, and the aggregate yarn is impregnated with a binder resin and cured to form the linear body 2. Moreover, the linear body 2 may be formed by using the linear body 2 in which a twist is added to the aggregated yarn, impregnating the aggregated yarn with a binder resin, and curing.

As the binder resin for impregnating and curing the set yarn, a thermosetting resin such as a silicone resin, a phenol resin, an epoxy resin, a polyimide resin, a polymaleimide resin, and an unsaturated polyester resin can be used.

A linear body 2 obtained by impregnating and hardening a binder yarn into a set yarn of alumina filaments is produced by various methods known as a so-called tow prepreg production method, and this linear prepreg is produced. It can be manufactured by curing. For example, a set yarn consisting of strands or yarns of alumina long fiber was pulled out from a bobbin, continuously impregnated with a resin binder such as an epoxy resin, and wound and dried so as not to overlap with an appropriate winding machine. Thereafter, a method of obtaining the linear body 2 by heating and curing, or a method of drawing out a set yarn consisting of strands or yarns of alumina long fiber from a bobbin and continuously impregnating with a resin binder such as an epoxy resin, There is a method of winding the linear body 2 around a drum having a diameter of about 80 cm while heating and curing through the inside.

After the linear members 2 are trimmed to a desired length, they may be buried one by one as they are, but several tens to thousands of them are bundled and one end 4 is inserted into the pipe 3. One end 5 of the linear body 2 in the pipe 3 or the like.
Can be bound by bonding with a binder resin such as an epoxy resin to form a brush-like grindstone 1.

The brush-like grindstone 1 thus manufactured
For example, as shown in FIG. 2, the linear member 2 is inserted into a pipe-shaped cap 6, and the free end 5 is formed into a shape of a magnesium molded product or an aluminum die-cast product which is a metal work W. In total, about several cm to several tens cm are exposed and used.

(Deburring and Polishing Method) Using such a brush-like grindstone 1, non-ferrous materials such as magnesium molded products, magnesium alloy molded products, aluminum molded products, aluminum die cast products, copper molded products, copper alloy molded products, etc. When deburring and polishing the metal work W, the non-ferrous metal work W is fixed on a work table. Such a work W is, for example, a screen frame or a case of a mobile phone or a notebook personal computer, and the concave and convex shape formed on the surface thereof has tended to be increasingly finer and more complex in recent years.

On the other hand, for the brush-like grindstone 1, an arrow A
As shown by, the free end 5 of the brush-like grindstone 1 is pressed against the workpiece W while rotating the brush-like grindstone 1 about an axis L1 parallel to the direction in which the linear body 2 extends. Deburring and polishing of W are performed. At this time, if the area to remove burrs is narrow,
This state is maintained for a predetermined time, but when the area from which burrs are to be removed is large, the brush-like grindstone 1 is moved in a direction perpendicular to the axis L1 (in the direction of arrow C) to remove burrs on the work W. The brush-like grindstone 5 is moved to all the regions where the operation is to be performed.

As a result, a non-ferrous metal work W such as a magnesium molded product, an aluminum die-cast product, a copper alloy product or the like is cut, polished, deburred and polished by the linear body 2 of the brush-like grindstone 1. .

(Evaluation 1) Here, when the surface of the work W is polished while rotating the brush-like grindstone 1 at 1800 rpm using the aluminum plate as the work W, the reduction in the work W, the maximum surface roughness, and the highest surface roughness are obtained. The results of evaluation of the values are shown in FIGS. 3, 4 and 5.

FIG. 3 is a graph showing the change over time of the weight loss of the workpiece W when the workpiece W is polished with various brush-like grindstones. In this graph, the greater the weight loss, the more the brush-like grindstone cuts the workpiece W. High ability to polish. FIG.
And FIG. 5 respectively show the work W with various brush-like grindstones.
5 is a graph showing a temporal change in surface roughness when polishing is performed, and a temporal view of the maximum value of the surface roughness. The smaller the value, the better the finished state of polishing. In this evaluation, as an example of the present invention, the results of polishing with a brush-like grindstone 1 using a linear body 2 made of aggregate yarn of alumina long fibers having a thickness of 15 μm and 10 μm are shown by solid lines L1 and L1, respectively. This is indicated by a dotted line L2. Further, as a comparative example, a result using a nylon brush containing abrasive grains is shown by a solid line L3, and a result using a brush-like grindstone formed by a linear body made of an aggregated thread of silicon carbide long fibers is shown by a dotted line L4. .

As shown in FIG. 3, a work W made of an aluminum plate has a high cutting and polishing ability because of a 15 .mu.m brush-like shape using a linear body 2 made of aggregated filaments of alumina having a thickness of 15 .mu.m. A grindstone, a brush-like grindstone formed by a linear body composed of a set yarn of silicon carbide long fibers,
The brush-like grindstone using the linear body 2 made of the aggregate yarn of the alumina long fiber having a thickness of 10 μm, and the nylon brush containing abrasive grains are in this order.

As shown in FIG. 4 and FIG. 5, the condition of the finished polishing of the work W made of an aluminum plate is good because the linear body 2 made of a gathered yarn of alumina long fibers having a thickness of 15 μm is used. Brushed whetstone, thickness 10
A brush-like grindstone using a linear body 2 composed of aggregated yarns of alumina long fibers of μm, a brush-like grindstone formed of a linear body composed of aggregated threads of silicon carbide long fibers, and a nylon brush containing abrasive grains in this order. is there.

As described above, the brush-like grindstone 1 using the linear body 2 made of the aggregated filaments of the alumina long fiber has a high ability to cut and polish the work W made of an aluminum plate, and also has the work W made of an aluminum plate. The finished state of the polishing for is also good. That is, in order to suitably grind the work W, it is not necessary that the brush-like grindstone is harder. It is necessary that the hardness is balanced between the work W and the brush-like grindstone. The long fiber has a hardness suitable for deburring and polishing the aluminum work W. As the work W is processed, the linear body 2 itself is appropriately worn and a new surface is formed. Is exposed, the work W can be efficiently polished for a long period of time, and the finish is good. Such a tendency is substantially the same for a non-ferrous metal work made of magnesium, a magnesium alloy, an aluminum alloy, copper, a copper alloy, etc., in addition to the work W made of aluminum.

Moreover, the brush-like grindstone using the linear body 2 composed of the aggregated filaments of alumina long fibers is less expensive than the brush-shaped grindstone formed by the linear body composed of the aggregated thread of silicon carbide long fibers. There is an advantage.

(Evaluation 2) Aluminum alloy (ADC1
2), magnesium alloy (AZ91), copper alloy (brass)
A 10 mm-thick plate-shaped workpiece W made of is made with a drilling machine with a 12Φ drill blade, and through burrs formed thereby are brushed with various brush-like grindstones at 1800 r.
Table 1 shows the results of evaluating the deburring performance when the substrate was removed in 30 seconds while rotating at pm.

[0027]

[Table 1]

In this evaluation, as an example of the present invention, a brush-like grindstone using a linear body 2 composed of aggregated yarns of alumina long fibers having a thickness of 15 μm and 10 μm was used, and twist was added to each of the aggregated yarns. Those that have been twisted or not twisted have been used. In addition, as comparative examples, a glass fiber brush, a brush-like grindstone formed of a linear body made of aggregated silicon carbide long fibers, a nylon brush containing abrasive grains, and a brass wire brush were used. In performing this evaluation, as shown in FIG. 2, the brush-like grindstone 1 was moved in the direction of arrow C while rotating, and a deburring test was performed.

When evaluated by such a method, as shown in Table 1, a non-ferrous metal work W made of an aluminum alloy is formed of a set of alumina long fibers having a thickness of 15 μm and 10 μm. When a brush-like grindstone using the linear body 2 is used, in each of which a twist is applied to the collective yarn, and in which a twist is not applied, a wire made of alumina filament having high hardness and elastic modulus is used. The result that the burrs were completely removed was obtained due to the suitability of the state body 2 for aluminum and aluminum alloy.

The characteristics of the alumina filaments are also exhibited for a non-ferrous metal work W made of a magnesium alloy, and the linear body 2 composed of aggregated filaments of alumina filaments having a thickness of 15 μm and 10 μm is used. With the brush-like whetstone used,
When the twist to the set yarn is added in each, when using a thing that is not twisted, when using a brush-like grindstone formed by a linear body consisting of a set yarn of silicon carbide long fibers, Good deburring results were obtained.

Further, for a work W made of a non-ferrous metal made of a copper alloy (brass), the thickness is 15 μm and 10 μm.
When a brush-like grindstone using a linear body 2 composed of a set yarn of alumina long fibers having a length of μm, each having a twist added to the set yarn or one having no twist applied thereto, silicon carbide is used. When using a brush-like grindstone formed of a linear body made of a collection yarn of long fibers, a good deburring result was obtained.

Thus, the brush-like grindstone 1 according to the present invention
According to (a brush-like grindstone using the linear body 2 made of aggregate yarn of alumina long fibers), any non-ferrous metal work W made of an aluminum alloy, a magnesium alloy, or a copper alloy
In addition, it is possible to perform deburring satisfactorily, and, compared to a brush-like grindstone using a linear body made of a set yarn of silicon carbide long fibers, there is less restriction on a processing object, and it is inexpensive. There is an advantage that is.

(Method of manufacturing the linear body 2 of the brush-like grindstone 1)
Such a brush-like grindstone can be manufactured, for example, by a method disclosed in Japanese Patent Application Laid-Open No. 2000-210847 filed by the present applicant. For example, a bobbin of a strand of alumina filaments, which is a bundle of alumina filaments, which is continuously wound after bundling and continuously winding 1000 filaments made of alumina filaments having a diameter of 10 μm to 15 μm in an untwisted state or after twisting, is used for fiber release. Of the epoxy resin (100 parts by weight of Epicoat 828, trade name, manufactured by Yuka Shell Epoxy Co., Ltd., 3 parts by weight of ethylamine triborate borate, 0.7 parts of imidazole) Parts by weight, containing 35 parts by weight of methyl ethyl ketone), impregnated with resin, and then continuously wound around a spool while removing excess resin with a squeezing roller. At 160 ° C. for one hour to cure the resin,
A thin wire-shaped molded article of alumina fiber reinforced resin (linear body 2) is obtained. Next, the formed body is cut from the bobbin, and then cut into a linear body 2 having a length of 100 mm. Next, as shown in FIGS. 1 and 2, one end 4 of these linear members 2 is embedded in a pipe 3 and then one end 4 of the linear member 2 embedded in the pipe 3 is epoxied. By fixing with a resin or silicone resin, the brush-like grindstone 1 whose other end is a free end 5 is manufactured.

[Other Embodiments] In the above embodiment, as the brush-like grindstone 2, as shown in FIG. 2, one in which the linear bodies 2 are bundled is used. As shown in FIG. 6, a plurality of bundles of linear bodies 2 are held along the periphery of a lower end surface 81A on a lower end surface 81A of a cylindrical main body 8A, and as shown in FIG. A plurality of bundles of linear bodies 2 held in a toothbrush shape with a predetermined distribution on a lower end surface 81B of 8B, as shown in FIG.
A plurality of bundles of linear bodies 2 may be held at predetermined intervals on the outer peripheral surface 81C of the disk-shaped main body 8C.
Further, as shown in FIG. 6 (D), the linear body 2 itself may be embedded and held in the outer peripheral surface 81D of the disk-shaped main body 8D.

Further, in the above-described embodiment, the free end 5 of the brush-like grindstone 1 is moved along the surface of the workpiece W by using the rotational movement indicated by the arrow A. The free end of the whetstone 2 is reciprocated or oscillated on the processing surface of the workpiece W,
Further, a movement in which these are combined may be performed.

[0036]

As described above, in the present invention,
Since the linear material that composes the brush-like grindstone is made by impregnating and hardening the binder resin into the aggregate yarn of alumina long fibers, it has higher hardness and lower rigidity than wire brushes or nylon filament brushes containing abrasive grains. Is strong. Therefore, the ability to cut and polish the work is high, so that the work can be efficiently deburred and polished. In addition, since the alumina filament has a hardness suitable for deburring and polishing a non-ferrous metal work made of magnesium, a magnesium alloy, aluminum, an aluminum alloy, copper, a copper alloy, etc. Can be efficiently deburred and polished over a long period of time, and the finish is good.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a brush-like grindstone to which the present invention is applied.

FIG. 2 is an explanatory view showing a deburring and polishing method using a brush-like grindstone to which the present invention is applied.

FIG. 3 is a graph showing a temporal change in weight loss when a workpiece is polished with various brush-like grindstones.

FIG. 4 is a graph showing a temporal change in surface roughness when a workpiece is polished with various brush-like grindstones.

FIG. 5 is a graph showing a temporal change in the maximum value of the surface roughness when the workpiece is polished with various brush-like grindstones.

FIG. 6 (A), (B), (C), (D)
It is explanatory drawing which shows the structure of the brush-like grindstone which can apply this invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush-like grindstone 2 Linear body 3 Pipe 4 One end 5 Free end 6 Cap W Non-ferrous metal work

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Shun Matsushita 3385-2, Minamiminowa-mura, Minamiminowa-gun, Kamiina-gun, Nagano BB11 BC03 EE29

Claims (4)

[Claims] A linear body obtained by impregnating and curing a resin into a set yarn composed of a plurality of alumina filaments or a plurality of linear bodies is bound, and a free end of the linear body is formed of magnesium, a magnesium alloy, aluminum, A brush-like grindstone characterized by performing deburring and polishing on a non-ferrous metal work made of an aluminum alloy, copper, or a copper alloy by relatively moving the work. 2. The brush-like grindstone according to claim 1, wherein, in the linear body, the aggregate yarn extends straight and no twist is applied to the aggregate yarn. 3. The brush-like grindstone according to claim 1, wherein in the linear body, a twist is added to the collective yarn. 4. The free end of a linear body obtained by impregnating and hardening a resin into a set yarn composed of a plurality of alumina filaments or a brush-like grindstone in which a plurality of the filaments are bound, is made of magnesium, a magnesium alloy, aluminum, or aluminum. Alloys, copper,
Alternatively, a deburring and polishing method characterized in that deburring and polishing are performed on a nonferrous metal work made of a copper alloy by moving the work relative to the work.