WO2003101670A1 - Rotary polishing tool - Google Patents

Abstract

A rotary polishing tool capable of finishing a polishing subject surface to a desired degree of surface roughness. A plurality of substantially circular polishing cloth sheets (7) are superposed to form a substantially cylindrical polishing member (3). The peripheral edge of each polishing cloth sheet (7) is in a meandering form reciprocating axially of the center shaft. The developed shape of the outer edge of each polishing cloth sheet (7) is a substantially S-shaped curve. The polishing member (3) is rotated to polish the polishing subject article by its peripheral surface. Since polishing is effected with the outer edge of each polishing cloth sheet (7) moving axially, the peripheral edges of the polishing cloth sheets (7) abut against the entire surface of the polishing subject surface. The polishing cloth sheets (7) become polishable therebetween, so that the polishing subject surface is finished to a desired degree of surface roughness.

Description

 Specification

 Rotary polishing tool

[Technical field]

 The present invention relates to a rotary polishing tool suitable for removing scale and scratches on a steel sheet surface, for example.

[Background technology]

 Generally, the scale on the steel plate surface is removed by polishing the surface of the steel plate. This surface polishing is an important process for the post-processing of steel rice. For example, when a polished steel rice is subjected to bending (bending) to form a tank wall of an oil tank, If the scratches on the surface of the supplied steel remain on the surface, the steel sheet may break due to bending stress. Therefore, it is necessary to finish the surface polishing so that no scratches remain on the surface to be polished. Usually, a coating for protecting the surface is applied to the surface to be polished, and the surface to be polished must have a surface roughness suitable for forming the coating.

 As one means for forming this kind of polished surface, a large number of disk-shaped polishing cloths are stacked to form a cylindrical polishing member, and the polishing member is rotated around its central axis. Rotary polishing tools that grind the surface to be polished on the peripheral surface, that is, the peripheral edge of each abrasive cloth have been adopted.

However, since the polishing member of the above-mentioned rotary polishing tool has a structure in which a large number of flat polishing cloths are stacked, microscopically, the surface to be polished is polished at the periphery of each polishing cloth. It is not polished between polishing cloths. Therefore, the surface to be polished has a large number of streaks and depressions due to the contact of the peripheral edge of each abrasive cloth, and a desired surface roughness cannot be obtained. An object of the present invention is to solve the above-mentioned problems and to provide a rotary polishing tool capable of finishing a surface to be polished to a desired surface roughness.

[Disclosure of the Invention]

 In view of the above-mentioned problem, the present invention is to form the peripheral edge of the polishing cloth paper in a meandering shape, so that the developed shape is substantially an S-shaped curve, and the peripheral edge of the polishing cloth paper hits all of the polishing surface. With this setting, it is possible to polish between the polishing cloths, and the surface to be polished is finished to a desired surface roughness.

 That is, the present invention is based on the premise that a substantially columnar polishing member is rotatably supported around its central axis, and the polishing member is rotated to grind an object to be polished on its peripheral surface. Has a structure in which a plurality of substantially circular abrasive cloths are superimposed in the axial direction of the central axis, and the periphery of the abrasive cloth has a meandering shape reciprocating in the axial direction of the central axis.

 It is preferable that the polishing member adopts a structure in which a plurality of polishing cloths are superposed on each other in the axial direction of the central axis. In this polishing unit, a ring-shaped inner fitting is inserted into a shaft insertion opening formed at the center of each of the polishing cloth papers, and the inner fittings hold a plurality of polishing cloth papers in a superposed state. Then, the polishing member can be easily assembled simply by superposing the desired number of polishing units in the axial direction according to the required polishing width.

As a method of forming the periphery of each of the polishing cloths in a meandering manner, various methods can be adopted other than forming the polishing cloths by clearing them in advance. In particular, when the above-mentioned inner metal fitting is used, a part of the inner metal fitting of the polishing unit can be pressed in the axial direction of the central axis to form the periphery of the polishing cloth paper in a meandering shape. Also, the polishing cloth paper is formed by forming a coating film on a mesh-like base material capable of applying various base materials such as paper, cloth, and non-woven fabric and abrasive particles of various particle sizes and materials. If used, the amount of abrasive particles adhering to the base material can be increased, The pressing force can be reduced. [Brief description of drawings]

 FIG. 1 (a) is a front view of the rotary polishing tool of the present invention, FIG. 1 (b) is a plan view thereof, and FIG. 1 (C) is a side view thereof.

 FIG. 2 is an exploded perspective view of the rotary polishing tool.

 FIG. 3 is a development view of the outer peripheral surface of the flange.

 FIG. 4 (a) is a perspective view of the polishing unit, and FIG. 4 (b) is a side view. FIG. 5 (a) is a front view of the polishing unit, FIG. 5 (b) is a sectional view taken along line AA, and FIG. 5 (c) is a sectional view taken along line BB.

 FIG. 6 is a developed view of the outer peripheral surface of the polishing member.

 FIG. 7 is a cross-sectional shape of the polished surface.

 FIG. 8 is a roughness curve of a polished surface. [Best Mode for Carrying Out the Invention]

 Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

 The rotary polishing tool of the present embodiment can be applied to both an automatic polishing device and a manual polishing device. For convenience of explanation, a manual polishing device will be described. As shown in FIGS. 1 and 2, the rotary polishing tool 1 has a wheel shaft 2 that can pass through a rotating shaft driven by a driving source, and a substantially cylindrical shape held on the outer peripheral side of the wheel shaft 2. And a pair of ring-shaped flanges 4 fixed to both ends of the wheel shaft 2 so as to sandwich the polishing member 3 in the axial direction.

The wheel shaft 2 has a cylindrical shape made of, for example, steel, and has a circumferentially continuous groove formed on an outer peripheral surface of each end portion thereof for fitting a C-shaped retaining ring 5 to prevent the flange 4 from coming off. ing. The inner circumference of both ends of this wheel axle 2 A disk-shaped support plate 6 having a bearing through which the rolling shaft penetrates is fitted.

 The polishing member 3 is formed by arranging a large number of polishing cloth papers 7 in the axial direction, and each polishing cloth paper 7 is formed on a surface of a base paper such as paper, cloth, net, etc. The abrasive grains are formed with a coating film, and examples thereof include those manufactured by Riken Corundum and those manufactured by Sankyo Rikagaku. The polishing cloth 7 is formed in a ring shape having an opening 7 a at the center so as to be fitted to the wheel shaft 2. As shown in FIG. 3, an S-shaped curve having a desired amplitude in the axial direction is formed by combining circular curves on both inner surfaces in the axial direction of the flange 4. The S-shaped curve in the present embodiment is a gentle curve having a period of 180 degrees, an amplitude (AH = Hmax-Hmin) of 7 mm to 20 mm, and a circumference (L) of 37 mm. When it is 3.66 mm, the average gradient (0) between its vertices is 4 ° to 12 °, and the curve radius (R) force is 114.08 mm to 313.41 mm. By pressing and holding the polishing member 3 in the axial direction along this curve, the outer edge of each polishing cloth paper 7 is set so as to have a meandering shape.

 In the present embodiment, a plurality of abrasive cloths 7 are united by a ring-shaped inner metal fitting 8 engaged with a central opening 7a, and a plurality of the abrasive units 9 are arranged in the axial direction. Constitute the cylindrical polishing member 3.

 As shown in FIGS. 4 and 5, the inner metal fitting 8 has a cylindrical portion 8a fitted externally to the wheel shaft 2, and a central opening 7a of the polishing cloth paper 7 formed by bending both sides in the axial direction. And a flange portion 8b which presses the peripheral portion of the member in the axial direction. The inner metal fitting 8 is partially polished in the axial direction by upper and lower press dies having a curve similar to the S-shaped curve of the flange 4, so that the outer edge of the polishing cloth 7 has a meandering shape. A unit 9 is formed.

As shown in FIG. 6, on the outer peripheral surface of the polishing member 3, the outer edge of each polishing cloth 7 forms an S-shaped curve, and the length between the apexes on the outer end side in the axial direction is the polishing width (b ) When The length between the inner vertices in the axial direction is defined as the effective polishing width (be). That is, the effective polishing width (be) refers to a portion where the polishing cloth 7 continuously contacts the surface to be polished.

 That is, at the position of P 1 in the range of the effective polishing width (be) of the polishing width (b), after the outer edge of each abrasive cloth 7 hits, the outer edge of the adjacent abrasive cloth 7 hits continuously. The surface to be polished is polished to a predetermined polishing depth (d). At the position of P 2 outside the range of the effective polishing width (be), after the outer edges of the abrasive cloth 7 at both ends in the axial direction hit, the outer edge of the abrasive cloth 7 does not hit until the abrasive cloth 7 hits again. Therefore, the polishing depth at P2 is smaller than the polishing depth (d) within the effective polishing width (be), and the cross-sectional shape of the polished surface is substantially trapezoidal as shown in FIG.

 Next, an evaluation test result when the object to be polished is polished using the rotary polishing tool having the above-described configuration will be described. Fig. 8 shows the roughness curve of the surface to be polished when steel (high tensile steel) is polished using a hand-held polishing device. In Fig. 8, the scale on the vertical axis is enlarged to 20 times the scale on the horizontal axis. The surface roughness was measured using a small surface roughness tester manufactured by Mitutoyo (Mitutoyo) (Safetest SJ_301) with a cutoff value (Ac) of 8 mm and a measurement speed of 0.5 m. / sec ;, The measurement was performed once. Among the roughness parameters in the figure, Ra is the arithmetic mean roughness (the average value of the absolute value of the deviation from the mean line to the measurement curve), and Ry is the maximum height (from the lowest valley bottom seen from the mean line). Rz is the ten-point average roughness (measured from the line parallel to the average line, the average value of the top five peaks and the deepest from the fifth) Of the valley bottom with the average value of the valley bottom).

In the comparative example, the meandering width (amplitude) of the S-shaped curve of the flange 4 shown in Fig. 3 was measured using a mesh-type base material and abrasive cloth paper with a roughness count of # 80 (MG # 80, manufactured by Sankyo Rikagaku Co., Ltd.). ) Is Omm. Examples 1 to 4 are based on the case of using a polishing cloth paper (MG # 80, manufactured by Sankyo Rikagaku Co., Ltd.) with a roughness count of # 80 and a meandering width of the S-shaped curve of its flange 4 ( ΔΗ), average slope between vertices (Θ), and curve radius (R) are ΔH = 7 mm, 0 = 4 °, R = 3 13.4 1 mm in Example 1, and ΔΗ in Example 2. = 10 mm, θ = 7 °, R = 224.4 1 mm, Example 3 is ΔΗ = 15 mm, 0 = 9 °, R = 149.19 mm, and Example 4 is ΔΗ = 20 mm, 0 = 12 °, and R = 11.148 mm.

 In Example 5, Δ 研磨 = 15 mm, = 9 °, R = 149 using a polishing cloth paper (A64 # 60, manufactured by Riken Corundum) having a roughness count of # 60 on a paper substrate. . 19 mm. In Comparative Examples and Examples 1 to 5, the circumferential length (L) of the flange 4 was 37.66 mm, and the polishing cloth 7 was a circular polishing cloth having a diameter of 200 mm. The meandering curve corresponds to the S-shaped curve of flange 4.

 According to the above experimental results, in the comparative example, Ra = 24.5 7 m, Ry = 1 27.7 ΐ, R ζ = 100 .5 / m, and the roughness curve also has the peak value of the unevenness. Is a large value. Looking at the actual polished surface, many grooves appeared parallel to the longitudinal direction.

 In contrast, in Examples 1 to 4, all of the roughness parameters were smaller than those of the comparative example, and the polished surface was polished smoothly. Was not confirmed. This is because, when the polishing member 3 is rotated, a portion of the outer edge of each polishing cloth paper 7 that contacts the surface to be polished moves in the axial direction periodically, and the entire surface of the polishing surface This is considered to be because the outer edge of the paper 7 and the gap between the polishing cloth papers 7 hit in order, so that streaky irregularities are not formed on the surface to be polished.

In the fifth embodiment, the roughness count is smaller than that of the other examples. In general, the smaller the roughness count, the larger the roughness parameter. Also, all of the roughness parameters were smaller than those of the comparative example, and the polished surface was polished smoothly. When the actual polished surface was observed, almost no groove lines were observed.

 Also, comparing the examples, when the meandering width is set to 15 mm (Example 3), the roughness parameter is smallest, and based on this, the meandering width is 10 mm to 20 mm. It turns out that setting to mm is particularly preferable.

[Industrial applicability]

 As is apparent from the above description, according to the present invention, the polishing cloth paper is superposed to form a substantially cylindrical polishing member, and the outer edge of each polishing cloth paper is formed in a meandering shape. The surface can be finished to a desired surface roughness without causing irregularities.

Claims

The scope of the claims 1. In a rotary polishing tool in which a substantially cylindrical polishing member is rotatably supported around its central axis, and the polishing member is rotated to polish an object to be polished on a peripheral surface thereof, the polishing member includes: A plurality of substantially circular abrasive cloths are superposed in the axial direction of the central axis, and a peripheral edge of the abrasive cloth is formed in a meandering shape reciprocating in the axial direction of the central axis. Utensils.  2. The polishing member includes a plurality of sets of polishing units formed by stacking the plurality of polishing cloths in the axial direction of the central axis, and each of the polishing units is disposed at the center of each of the polishing cloths. 2. A ring-shaped inner metal fitting is inserted into an opening for axial communication formed in the portion, and a plurality of abrasive cloth papers are sandwiched and held by the inner metal fitting in a superposed state. A rotary polishing tool according to item 1.  3. The periphery of the polishing cloth paper is formed in a meandering shape by pressing a part of the inner metal fitting in the axial direction of the central axis. The rotary polishing tool as described.  4. The rotary polishing tool according to claim 1, wherein the abrasive cloth paper is formed by coating abrasive grains on a mesh-like sheet.  5. A plurality of polishing cloths constituting a polishing member having a shaft insertion opening at the center are superposed, and a ring-shaped inner fitting is inserted into the opening in a state where the polishing cloth is superposed, and A polishing unit, wherein the polishing cloth is pressed and held by flanges formed at both ends in the axial direction to form a unit.  6. The polishing unit according to claim 5, wherein a part of the inner metal fitting is pressed in the axial direction of the central axis, whereby a periphery of the polishing cloth is formed in a meandering shape. Uru.