JPH09150371A - Polishing tool for high specular polishing of stainless steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a high specular finish capable excellent in glossiness, by efficiently removing a streak generated in prepolishing. SOLUTION: In this polishing tool, a rotary shaft 4 parallel to a surface of a polished workpiece 5 is secured to a cylindrical base 2, a resin-made sponge 3 is bonded to a circumferential surface of the base 2. A plurality of slits 1 are formed by an equal space in a circumferential direction in the resin-made sponge 3, the slit 1 is diagonally crossed with a polishing work surface. A polishing fluid and abrasive grain supplied to the surface of the polished workpiece 5 are discharged by the slit 1 to the outward of the polishing work surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing tool used for high mirror finishing of stainless steel.

[0002]

2. Description of the Related Art In mirror finishing of stainless steel, cup type polishing using a polishing liquid in which abrasive grains such as alumina are dispersed in an aqueous nitric acid solution is used in order to obtain a high-gloss mirror-finishing quality without polishing scratches. The method has been adopted. Nitric acid, a chemical of the polishing liquid used, is highly corrosive to metals and the human body. Therefore, the cost of managing the polishing device and the scattering to the human body, the corrosion prevention maintenance of the polishing liquid tank, and the like are high, and the total polishing cost is very high. Electropolishing is also used as a means for obtaining a high mirror surface, but the polishing cost is similarly high due to the control of electrolysis conditions, control of electrolytic solution, and treatment. Buffing using chrome oxide or alumina-based abrasives has also been investigated, but buffing has a high efficiency in removing polishing streaks on the front polishing surface, but it is unique compared to the above two polishing methods. There is a drawback that vertical stripes and flaws are easily formed. Furthermore, since the surface quality is not stable, high quality mirror polishing cannot be obtained, and it cannot be applied to an article requiring a high mirror surface.

[0003]

Therefore, in order to suppress the generation of vertical stripes and flaws, a slit for smoothly supplying the polishing liquid to the polishing surface, discharging polishing dust, unnecessary abrasive grains, etc. is provided. It is considered to be formed. However, as shown in FIG. 1, a plurality of slits 1 are usually provided in the resin sponge 3 bonded to the base 2 so as to be orthogonal to the polishing action surface. The rotating shaft 4 is attached to the base 2,
Polishing is performed by sliding the resin sponge 3 against the material to be polished while rotating. Since the slits 1 are orthogonal to the polishing surface, the polishing debris or the like is not sufficiently discharged during polishing, and the polishing debris or the like flows while being pressed against the surface of the material to be polished. As a result, it is inevitable that a large amount of vertical stripes and flaws still occur. The generation of vertical stripes and flaws is the same in the cup-type polishing tool shown in FIG. The present invention has been devised to solve such a problem, and by forming a slit on the polishing surface at an arbitrary inclination angle, a mirror surface having high quality and excellent gloss without polishing scratches is formed. An object of the present invention is to provide a polishing tool capable of efficiently polishing.

[0004]

In order to achieve the object, a polishing tool for high mirror polishing of the present invention has a rotating shaft parallel to the surface of a material to be polished and a cylindrical base to which the rotating shaft is fixed. When,
A resin sponge bonded to the circumferential surface of the base, and formed on the outer circumferential surface of the resin sponge at equal intervals in the circumferential direction,
A plurality of slits obliquely intersecting the polishing surface are provided, and the polishing liquid and abrasive grains supplied to the surface of the material to be polished are discharged to the outside of the polishing surface by the slits. The polishing tool of the present invention is preferably used for composite polishing that combines a chemical polishing action and a mechanical polishing action. In this polishing tool, as shown in FIG. 3, a resin sponge 3 having a slit 1 is fixed to a base 2 to which a rotary shaft 4 is attached. A resin having excellent chemical resistance such as urethane resin, melamine resin and shellac resin is used for the sponge 3, and the material, porosity, resin hardness and the like are selected according to the state of the pre-polished surface. As shown in FIG. 4, the slits 1 are inclined with respect to the polishing action surface at a predetermined inclination angle α, and are set to a number and a groove width that do not reduce the polishing ability.

[0005]

[Function] In the straight type polishing, vertical streaks and flaws enter the surface of the material to be polished due to non-uniformity of the polishing surface, inclusion of polishing dust and unnecessary abrasive grains, and the like. However, as shown in FIG. 3, when the resin sponge 3 is used as the polishing tool, the polishing action surface elastically and uniformly contacts the surface of the workpiece 5. Therefore, it is possible to suppress the generation of vertical stripes and flaws due to the unevenness of the polishing surface. The occurrence of vertical stripes and scratches due to the inclusion of polishing dust and unnecessary abrasive grains is suppressed by forming a slit 1 inclined at an inclination angle α on the polishing surface to accelerate the discharge of polishing dust and unnecessary abrasive grains. To be done. That is, the slit 1 eliminates retention of polishing dust and unnecessary abrasive grains on the polishing surface, and efficiently discharges polishing dust and unnecessary abrasive grains to the outside. As a result, a high quality mirror surface without vertical stripes or flaws can be obtained.

[0006]

EXAMPLE In this example, a straight type polishing tool shown in FIG. 3 was used, and a SUS304 stainless steel square pipe having a rectangular cross section with a side of 40 mm and a length of 200 mm was used.
The material to be polished was pre-polished with 3,000 elastic grindstones. The base 2 is made of acrylic resin and has an outer diameter of 100 m
A urethane resin sponge 3 processed into a cylindrical shape having a size of m, an inner diameter of 60 mm and a width of 50 mm was adhered to the base 2.
The outer peripheral surface of the sponge 3 has an inclination angle α with respect to the polishing surface.
Eight slits 1 with a width of 10 mm and a width of 45 mm were formed at equal intervals in the circumferential direction. As the polishing liquid 6, a solution was prepared by diluting oxalic acid with tap water to a concentration of 1% and blending and peptizing white alundum of # 6,000 as polishing abrasive grains at a ratio of 75 g per liter of an aqueous oxalic acid solution. The polishing conditions for both the straight type and the cup type were set to a rotation speed of 300 rpm, a feed rate of 1,000 m / min, and a pressing amount of 1 mm / pass. The polished surface was observed using each polishing tool and the polishing characteristics were evaluated. The polishing ability of the polishing tool having the slit 1 according to the present invention was judged by the number of passes required for removing the scratches, and compared with the polishing ability of the cup-shaped polishing tool shown in FIG. As can be seen in the comparison results in Table 1, # 3,000
The number of passes required to remove the scratches on the pre-polished surface was about 3 in the straight type and about 5 in the cup type. That is, it is understood that the straight type polishing tool has a significantly higher polishing ability than the cup type polishing tool, and the polishing efficiency is improved by about 70%.

[0007]

In order to investigate the influence of the inclination angle α of the slit 1 attached to the sponge 3, a polishing tool in which the slit 1 is formed at an inclination angle α = 45 degrees, a polishing tool and a slit in which a slit orthogonal to the polishing surface is formed. Three types of polishing tools without were used. Then, the influence of the type of polishing tool on the ability to remove streaks on the pre-polished surface and the generation of vertical lines and scratches was investigated. As can be seen in Table 2 showing the investigation results, the streak removing ability did not differ depending on the type of polishing tool. However, in the polishing tool according to the present invention, the generation of vertical stripes and flaws was substantially suppressed. From this,
It was confirmed that the slanted slit 1 is effective in preventing the generation of vertical stripes and flaws.

[0009]

Further, the surface roughness of the polishing surface obtained by 3-pass polishing using a straight type polishing tool with a slit 1 having an inclination angle α = 45 degrees was measured using a conventional cup type polishing tool. The results are shown in Table 3 in comparison with 5-pass polishing.
The surface roughness shows no difference between the two, and R _max = 0.
A high mirror surface of 1 μm level is obtained. In addition, defects such as vertical stripes and flaws were not detected in any polishing.

[0011]

[0012]

As described above, in the polishing tool of the present invention, the resin sponge adhered to the circumferential surface of the base is formed with the slits inclined to the polishing action surface. Abrasive grains and polishing debris of the polishing liquid supplied to the surface are efficiently discharged from the polishing surface, and defects such as vertical lines and scratches are not generated on the polishing surface. for that reason. The streak generated in the pre-polishing step is efficiently removed, and a high mirror surface with excellent glossiness can be obtained. In this way, when using the polishing tool of the present invention, it is possible to perform a low-cost polishing operation in which the number of steps is significantly reduced without deteriorating the surface polishing quality.

[Brief description of the drawings]

FIG. 1 A conventional straight type polishing tool in which a slit orthogonal to the polishing surface is formed.

[Fig. 2] Conventional cup-shaped polishing tool with resin sponge bonded to a base

FIG. 3 is a straight type polishing tool in which slits are formed at an inclined angle according to the present invention.

FIG. 4 is a slit pattern of a polishing tool having slits according to the present invention viewed from a polishing surface.

[Explanation of symbols]

1: Slit 2: Base 3: Resin sponge
4: rotating shaft 5: material to be polished 6: polishing liquid α: inclination angle of slit with respect to polishing surface

Claims (1)

[Claims] 1. A rotary shaft parallel to the surface of the material to be polished, a cylindrical base to which the rotary shaft is fixed, a resin sponge adhered to the circumferential surface of the base, and a circumferential base. Formed on the outer peripheral surface of the resin sponge at equal intervals, comprising a plurality of slits oblique to the polishing surface, the polishing liquid and abrasive particles supplied to the surface of the material to be polished are the slits of the polishing surface. A polishing tool for high-mirror polishing of stainless steel, which is discharged to the outside.