Component bonding method

Abstract

To solve a problem of a conventional technique, that is, to provide a method capable of attaching another member to a steel material using an adhesive after polishing an oxide film while preventing occurrence of fire.SOLUTION: A member adhering method of the present invention is a method of adhering a member to a steel material having an oxide film formed on the surface, comprising a polishing step and a coating step. In the polishing step, the oxide film portion is polished with a polishing wheel, and in the coating step, an adhesive is applied to the surface of the steel material and the member. Further, the polishing wheel comprises a rotating body and a plurality of polishing cloths attached to an outer periphery of the rotating body. And the member is adhered to the steel material with an applied adhesive interposed therebetween.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for attaching a member to a steel material having an oxide film formed thereon, and more specifically, to a method for attaching a member to a steel material using an adhesive after polishing the oxide film with a polishing wheel.

Background Art

[0002] Production facilities such as factories are generally of a so-called steel frame structure mainly composed of steel materials such as H-shaped steel and steel pipes, and are configured by combining members such as steel column members, beam members, and diagonal members. For example, a beam member made of the same H-shaped steel is attached to a column member made of H-shaped steel, and further, a diagonal member made of channel steel or angle steel is attached to the column member and the beam member to construct this steel frame structure.

[0003] When attaching a beam member to a column member or attaching a diagonal member to a column member or a beam member, bolt joining or welding joining is usually used. In particular, when attaching a diagonal member, a gusset plate is often used, and welding joining is used to install this gusset plate on a column member or a beam member.

[0004] Welding joining is a method of joining two members by melting and combining two steel materials (base materials) to be joined, or by further melting and adding a steel material of the same quality (filler metal). There are various types such as gas welding, electron beam welding, and laser welding, but the most commonly used is arc welding. Arc welding is a method of generating an arc by applying a potential difference between electrodes slightly separated from each other, and melting the base material and the filler metal with the heat generated by this arc of air discharge. Specifically, a welding rod (filler metal) connected to the other end of the electrode is brought close to the base material connected to one end of the electrode to generate a white-hot arc (arc light), and the base material is melted by the heat of the arc, and at the same time, the molten steel in which the steel of the welding rod has melted is added to the base material.

[0005] Members such as columns, beams, and diagonal members are often installed during the construction of buildings, but they may also be installed retrospectively for the purpose of seismic reinforcement of existing buildings (such as factories). When installing retrospectively, the welding work carried out when attaching the members may become a problem. As described above, since welding work involves fire, it cannot be carried out in facilities that avoid fire, such as those storing flammable products in buildings such as factories during operation. Also, when the building is a manufacturing facility for products, it is better to avoid welding work as it may affect the manufacturing process.

[0006] It can also be pointed out that welding work has problems such as being accompanied by complicated operations. For example, for arc welding, in addition to an arc welding machine, a manual welding torch for holding the welding rod and a welding screen for protecting the operator's eyes from the arc light are required. Moreover, since an arc welding machine requires a power source, a captive cord and a captive drum are also required. Thus, to perform arc welding, various tools need to be prepared, and these tools must be moved every time the welding location is changed. In particular, since the arc welding machine is relatively heavy (even a small one is about 50 kg), moving it requires considerable labor and time, and the routing of the captive cord involved is also a very time-consuming task. Furthermore, arc welding is an extremely delicate operation that can only be performed by those who have received special training, and in addition, it is usually carried out by those with considerable experience, so it is not easy to secure welders.

[0007] Under such circumstances, other joining techniques to replace welding joints have been eagerly desired. Therefore, in Patent Document 1, it is proposed to use adhesive bonding instead of welding bonding, and a technique for adhesively fixing the mounting jig of the panel material to the mounting base is proposed.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] By the way, an oxide film called mill scale or black scale may be formed on the surface of steel materials such as H-beams. This oxide film is generated by reacting with oxygen in the air during hot working and can be formed on the surface of the steel material but does not occur inside. When trying to attach another member to a steel material with an oxide film formed on its surface using an adhesive, there is a risk that a highly reliable adhesive force cannot be obtained due to this oxide film. Therefore, when performing adhesive bonding, it is desirable to remove the oxide film on the surface of the steel material. In this case, polishing machines such as disk sanders, sandblasting, rust removers, etc. will be appropriately used. However, if the oxide film is polished using a polishing machine, there is a risk of generating sparks, resulting in a significant reduction in the effect of adopting adhesive bonding instead of welding. In addition, sandblasting requires large-scale installation on-site and is accompanied by a large amount of dust, which has an adverse impact on the surrounding environment. On the other hand, in the case of using special chemical agents such as rust removers, it takes a long time until the removal treatment of the oxide film is completed, and careful cleaning of the steel material is required so as not to leave the chemical agent after the treatment.

[0010] The problem of the present invention is to solve the problems of the prior art, that is, to provide a method capable of polishing the oxide film while suppressing the generation of fire and then attaching another member to the steel material using an adhesive.

Means for Solving the Problems

[0011] The present invention focuses on the point of polishing the oxide film with a polishing wheel and then attaching another member to the steel material using an adhesive, and is made based on an unprecedented idea.

[0012] The method for adhering a member of the present invention is a method for adhering a member to a steel material having an oxide film formed on its surface, and is a method comprising a polishing step and an application step. In the polishing step among these, the oxide film portion is polished with a polishing wheel, and in one of the application steps, an adhesive is applied to the surface of the steel material or the member. The polishing wheel is configured to include a rotating body and a plurality of polishing cloths attached to the outer periphery of this rotating body. And the member is adhered to the steel material via the applied adhesive.

[0013] The method for adhering a member of the present invention can also be a method further comprising a polishing determination step. In this polishing determination step, the "oxide film ultimate tensile strength" is compared with the "design tensile strength" of the steel material and the member set in advance, and when the oxide film ultimate tensile strength is lower than the design tensile strength, it is determined that polishing of the oxide film portion is necessary. The oxide film ultimate tensile strength is the tensile strength when the member adhered with an adhesive to the steel material in a state where an oxide film is formed on the surface peels off. In this case, when it is determined in the polishing determination step that polishing is necessary, the polishing step is performed.

[0014] The method for adhering a member of the present invention can also be a method further comprising a test step. In this test step, a member is adhered to a steel material having an oxide film formed on its surface with an adhesive, and the oxide film ultimate tensile strength is measured by performing a tensile test on this member. In this case, in the polishing determination step, the oxide film ultimate tensile strength measured in the test step is compared with the design tensile strength.

[0015] The method for adhering a member of the present invention can also be a method in which the polishing step is composed of a first polishing step and a second polishing step, and further comprises a confirmation step. In this confirmation step, the oxide film portion is visually confirmed while the first polishing step is being performed. And when a white turbid layer is visually confirmed in the confirmation step, the second polishing step is subsequently performed.

[0016] The member adhesion method of the present invention can also be a method further comprising a rotational speed planning step. In this rotational speed planning step, the planned rotational speed of the rotating body is set according to the coarseness of the abrasive cloth to be used. In the rotational speed planning step, the planned rotational speed is set within the range of 500 rpm to 5000 rpm. In the polishing step in this case, the rotating body is rotated at the planned rotational speed.

[0017] The member adhesion method of the present invention can also be a method of polishing using an abrasive wheel including an abrasive cloth with a mesh size of #40 to #120 (number 40 to number 120).

Effects of the Invention

[0018] The member adhesion method of the present invention has the following effects. (1) It is possible to polish the oxide film while suppressing the generation of sparks, and as a result, the member can be attached to the steel material with a highly reliable adhesive force. (2) Since welding work is not required, the generation of sparks can be suppressed, and the work can be freed from complicated work, and the trouble of securing a welding worker can also be avoided. (3) Without the need for large-scale installation such as sandblasting, and without taking a long time to remove the oxide film like a rust remover, the member can be easily and quickly attached to the steel material.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0020] An example of the implementation of the member adhesion method of the present invention will be described with reference to the drawings.

[0021] The member adhesion method of the present invention is a method of attaching a member such as an angle steel (hereinafter, for convenience, referred to as "sub-member ES") to a steel material such as an H-shaped steel (hereinafter, for convenience, referred to as "main member EM") as shown in FIG. 1. However, an oxide film is formed on the surface of the main member EM, and this method is applied in the situation where the sub-member ES is attached to the portion where the oxide film is formed. In the present invention, the main member EM is a steel material (for example, SS400, etc.) having an oxide film formed on its surface, while the sub-member ES can be made of various materials such as a resin material in addition to a steel material (for example, SS400, etc.) as long as it can be adhesively fixed.

[0022] Further, the member adhesion method of the present invention is a method of attaching (that is, adhesively fixing) the sub-member ES to the main member EM with an adhesive. However, if an oxide film is formed on the surface of the main member EM, there is a risk that a highly reliable adhesive force cannot be obtained due to this oxide film. Therefore, the oxide film on the surface of the main member EM is removed. However, as described above, there is a risk of fire with a polishing machine such as a disk sander, large-scale installation is required for sandblasting, and it takes a long time to remove the oxide film with a rust remover, etc., and each has its own problems.

[0023] Therefore, in the present invention, the oxide film on the surface of the main member EM is removed using an abrasive wheel 100 as shown in FIG. 2. FIG. 2 is a diagram schematically showing the abrasive wheel 100, where (a) is a front view thereof and (b) is a side view thereof. As shown in this figure, the abrasive wheel 100 includes a columnar rotating body 101 (so-called drum) and an abrasive cloth 102 (e.g., sandpaper), and is formed by radially fixing a plurality of abrasive cloths 102 to the outer peripheral surface of the rotating body 101. Further, a shaft hole 103 is formed at the center of the rotating body 101, and a rotating shaft 104 can be inserted into this shaft hole 103 as shown in FIG. 2(b). Then, for example, using a powered rotating device, the rotating body 101 and the abrasive cloth 102 are rotated together with the rotating shaft 104, and the oxide film is polished by hitting the abrasive cloth 102 against the surface of the main member EM. Note that, as shown in FIG. 2(a), each of the abrasive cloths 102 is bent in the same direction (clockwise in the figure), and when polishing the oxide film, it is advisable to rotate in the direction opposite to the bending direction of the abrasive cloth 102 (counterclockwise in the figure).

[0024] Subsequently, with reference to FIG. 3, the detailed procedure of the member bonding method of the present invention will be described. FIG. 3 is a flowchart showing the main steps of the member bonding method of the present invention. As shown in this figure, the member bonding method of the present invention is roughly classified into a "design step" of planning work specifications and the like in advance, and a "bonding step" of actually adhesively fixing the sub-member ES to the main member EM on-site.

[0025] (Design step) First, a test step (Step 211 in FIG. 3) for obtaining the "oxide film ultimate tensile strength" is performed. Here, the oxide film ultimate tensile strength is the tensile strength when the sub-member ES adhesively fixed to the main member EM with an oxide film formed on its surface is pulled and the sub-member ES peels off from the main member EM. Therefore, in the test step, a tensile test is performed using the target main member EM and sub-member ES, and the oxide film ultimate tensile strength is measured. Note that if the oxide film ultimate tensile strength related to the target main member EM and sub-member ES is already known in advance, this test step can be omitted.

[0026] When the acid film limiting tensile strength is obtained, the specifications of the grinding wheel 100 including the mesh size of the abrasive cloth 102 are selected (Step 212 in Fig. 3), and the rotational speed (number of rotations per unit time) of the rotating shaft 104 is planned (Step 213 in Fig. 3). As a result of research experiments conducted by the inventors as described later, it was found that when the rotating shaft 104 is rotated at a rotational speed of 500 to 5,000 rpm (especially 500 to 3,000 rpm), the acid film can be removed without generating sparks during grinding. Therefore, the rotational speed of the rotating shaft 104 is preferably planned within the range of 500 to 5,000 rpm (especially 500 to 3,000 rpm). Also, in the same research experiment, it was found that when grinding using the abrasive cloth 102 with the same mesh size, the higher the rotational speed of the rotating shaft 104, the shorter the time required to remove the acid film. Furthermore, when grinding using the abrasive cloth 102 with a considerably fine mesh size, the acid film can be removed by rotating the rotating shaft 104 at a high speed, while when grinding using the abrasive cloth 102 with a considerably coarse mesh size, the acid film can be removed even when rotating at a low speed. Therefore, the rotational speed of the rotating shaft 104 is preferably planned according to the mesh size of the abrasive cloth 102 used. Hereinafter, the rotational speed of the rotating shaft 104 planned here will be referred to as the "planned rotational speed".

[0027] In the design process, it is also possible to determine the necessity of removing the acid film (Step 214 in Fig. 3). For example, for buildings such as factories, detailed specifications such as the allowable stress and allowable displacement are defined, and the "design tensile strength" of the main member EM and the sub-member ES may be set in advance. Here, the design tensile strength is the tensile strength required to prevent the sub-member ES from peeling off from the main member EM when the sub-member ES is pulled by the occurrence of an external force or the like.

[0028] When the limiting tensile strength of the oxide film is lower than the designed tensile strength, the limiting tensile strength of the oxide film will be reached before the designed tensile strength is reached, that is, the required designed tensile strength cannot be satisfied. On the other hand, when the limiting tensile strength of the oxide film is higher than the designed tensile strength, if an adhesive with appropriate strength (especially tensile shear adhesion strength) is used, the sub-member ES will not peel off up to the designed tensile strength regardless of the limiting tensile strength of the oxide film. Therefore, when the limiting tensile strength of the oxide film is lower than the designed tensile strength (Yes in Step 214 of Fig. 3), it is determined that polishing of the oxide film is necessary, and when the limiting tensile strength of the oxide film is higher than the designed tensile strength (No in Step 214 of Fig. 3), it is determined that polishing of the oxide film is not necessarily required. In addition, when it is determined that polishing of the oxide film is not required, as shown in Fig. 3, it is possible to proceed to the coating process (Step 224 of Fig. 3) without polishing, or it is also possible to perform the coating process after polishing (Steps 221 to 223 of Fig. 3).

[0029] (Adhesion process) In the subsequent process, first, the oxide film within the region on the surface of the main member EM where the sub-member ES is to be adhesively fixed is polished by the polishing wheel 100 (polishing process). This polishing process can be composed of two steps: the first polishing step (Step 221 in FIG. 3) and the second polishing step (Step 223 in FIG. 3), as shown in FIG. 2. The inventors found that when polishing the oxide film with the polishing wheel 100, a cloudy layer appears (so to speak, in a thin film state) before the oxide film is completely removed (that is, at an intermediate stage). In other words, until the cloudy layer appears, even if polishing is carried out for the planned time, it is insufficient and the polishing operation cannot be completed. That is, until the cloudy layer appears, it can be regarded as the first polishing step (Step 221 in FIG. 3) that constitutes the first half of the polishing operation, and after the cloudy layer appears, it can be regarded as the second polishing step (Step 223 in FIG. 3) that constitutes the second half of the polishing operation. Therefore, as shown in FIG. 3, during the polishing operation, visually confirm the oxide film. If the cloudy layer cannot be confirmed yet (No in Step 222 in FIG. 3), continue the first polishing step, and if the cloudy layer can be confirmed (Yes in Step 222 in FIG. 3), it is possible to shift to the second polishing step. In addition, in the first polishing step and the second polishing step, it is also possible to execute by changing the specifications of the polishing wheel 100 (including the mesh size of the polishing cloth 102) and the planned rotational speed of the rotating shaft 104, and of course, it is also possible to execute without changing. Also, in the polishing process (including the first polishing step and the second polishing step), it is preferable to use a polishing wheel equipped with a polishing cloth 102 having a mesh size of #40 to #120 (No. 40 to No. 120).

[0030] When it is recognized that the oxide film on the surface of the main member EM has been removed by the polishing wheel 100, apply an adhesive to the surface of the main member EM, and bring a predetermined portion of the sub-member ES into contact with the adhesion region to adhesively fix the sub-member ES to the main member EM (Step 224 in FIG. 3). Of course, it is also possible to apply the adhesive to the sub-member ES instead of (or in addition to) the surface of the main member EM. Here, as the adhesive to be used, in addition to acrylic adhesives, various conventionally used adhesives such as epoxy adhesives, modified silicone adhesives, urethane adhesives, and polyester adhesives can be adopted.

[0031] (Research and Experimental Examples) The results of the research and experiments actually conducted by the inventors will be described. FIG. 4 is an experimental result diagram showing the result of adhering and fixing the sub-member ES to the main member EM by the member adhesion method of the present invention, and shows five examples (Examples 1 to 5) experimented while changing the combination of the mesh size of the abrasive cloth 102 and the rotational speed of the rotating shaft 104. More specifically, in "Example 1", the mesh size of the abrasive cloth 102 is #80 (80 mesh), the rotational speed is 500 rpm, in "Example 2", the mesh size of the abrasive cloth 102 is #80, the rotational speed is 1500 rpm, in "Example 3", the mesh size of the abrasive cloth 102 is #80, the rotational speed is 3000 rpm, in "Example 4", the mesh size of the abrasive cloth 102 is #40 (40 mesh), the rotational speed is 5000 rpm, and in "Example 5", the mesh size of the abrasive cloth 102 is #120 (120 mesh), the rotational speed is 5000 rpm, and the oxide film of the main member EM (SS400 in this case) is polished.

[0032] As shown in FIG. 4, in Example 1, when polished for only 1 minute, a silver luster was confirmed on the surface of the main member EM, that is, the oxide film could be removed together with the white turbid layer. Similarly, in Examples 2 to 4, when polished for 30 seconds each, and in Example 5, when polished for 1 minute, the oxide film could be removed together with the white turbid layer (a silver luster was confirmed). Also, in any case, it was confirmed that no sparks occurred, that is, polishing could be performed without ignition.

[0033] Subsequently, with the oxide film removed from the surface of the main member EM, an adhesive was applied to fix the sub-member ES. Note that three types of adhesives are used: "acrylic adhesive (tensile shear adhesive strength of 5 MPa or more)", "epoxy adhesive (tensile shear adhesive strength of 5 MPa or more)", and "modified silicone (tensile shear adhesive strength of less than 5 MPa)". Then, when a tensile shear adhesive strength test was conducted on the portion where the sub-member ES was adhesively fixed to the main member EM (that is, the polished surface), in any case of Examples 1 to 5 and in any case of using any adhesive, "cohesive failure of the adhesive" occurred, that is, it was shown that the sub-member ES did not peel from the main member EM at the oxide film limit tensile strength and the original tensile shear adhesive strength of the adhesive was exhibited.

[0034] From the above results, it can be seen that the oxide film can be removed by polishing at a rotational speed of 500 rpm (Example 1) to 5000 rpm (Examples 4 and 5), and the oxide film can be removed by using a polishing wheel equipped with a polishing cloth 102 having a mesh size of #40 (Example 4) to #120 (Example 5). Also, when polishing using a polishing cloth 102 of the same mesh size (Examples 1 to 3), it can be seen that the higher the rotational speed of the rotating shaft 104, the shorter the time required to remove the oxide film. Furthermore, when polishing using a polishing cloth 102 with a considerably fine mesh size (e.g., #120), the oxide film can be removed by rotating the rotating shaft 104 at a high speed (e.g., 5000 rpm), while when polishing using a polishing cloth 102 with a considerably coarse mesh size (e.g., #80), it can be seen that the oxide film can be removed even when rotating at a low speed (e.g., 500 rpm). Thus, if the sub-member ES is adhesively fixed after polishing the oxide film on the surface of the main member EM by the polishing wheel 100, it can be seen that the sub-member ES does not peel off from the main member EM at the oxide film limiting tensile strength and the original tensile shear adhesive strength of the adhesive is fully exhibited.

[0035] In order to grasp the application range of the member adhesion method of the present invention or to confirm its effectiveness, the inventors have also conducted research experiments on comparative examples and reference examples. Fig. 5 is an experimental result diagram showing the results obtained in order to grasp the application range of the member adhesion method of the present invention. Similar to Fig. 4, it shows three examples (Comparative Examples 1 to 3) in which experiments were conducted while changing the combination of the mesh size of the polishing cloth 102 and the rotational speed of the rotating shaft 104, and further shows a case (Reference Example) where the oxide film was not polished. More specifically, in "Comparative Example 1", the mesh size of the polishing cloth 102 was #80 and the rotational speed was 100 rpm, in "Comparative Example 2", the mesh size of the polishing cloth 102 was #80 and the rotational speed was 7000 rpm, and in "Comparative Example 3", the mesh size of the polishing cloth 102 was #150 (No. 150) and the rotational speed was 5000 rpm for polishing the main member EM.

[0036] As shown in Fig. 5, in Comparative Example 1 and Comparative Example 3, although polishing is performed for 5 minutes or more, a thin skin (i.e., the clouded layer), which is a part of the oxide film, remains. Therefore, even when the tensile shear adhesion strength test for the polished surface is performed, the thin skin peels off, so that the tensile shear adhesion strength of the adhesive cannot be exhibited. On the other hand, in Comparative Example 2, although the oxide film can be removed together with the clouded layer (confirming a silver luster) by performing polishing for 10 seconds, sparks are generated during polishing. Therefore, it is desirable to carry out the member adhesion method of the present invention after selecting an appropriate combination of mesh size and rotational speed (for example, Examples 1 to 5).

[0037] In addition, in the "Reference Example" where polishing was not performed, when the tensile shear adhesion strength test for the polished surface was carried out, it was found that the oxide film peeled off. That is, since the sub-member ES peeled off from the main member EM at the oxide film limiting tensile strength, the tensile shear adhesion strength of the adhesive could not be exhibited. Thereby, the effectiveness of the member adhesion method of the present invention can be confirmed.

[0038] Furthermore, the inventors are also conducting research experiments on comparative examples in which the oxide film is removed by other conventional methods. Fig. 6 is an experimental result diagram showing the results obtained in comparative examples in which the oxide film is removed by other conventional methods. "Comparative Example 4" is an example polished by a disk sander, "Comparative Example 5" is an example polished by a Bristle Blaster (registered trademark), "Comparative Example 6" is an example polished by sandblasting, and "Comparative Example 7" is an example in which the oxide film is removed by a rust remover.

[0039] As shown in Fig. 6, in Comparative Example 4 and Comparative Example 5, although the oxide film can be removed together with the white turbid layer (silver luster is confirmed) by polishing for 3 minutes, sparks were generated during the polishing. In Comparative Example 6, no sparks were generated during the polishing, and moreover, the original tensile shear adhesive strength of the adhesive was exhibited. However, since large-scale installation is still required, it can be said that this is a method that is actually difficult to adopt. Furthermore, in Comparative Example 7, even after 24 hours, the thin skin of the oxide film (that is, the white turbid layer) remained. Therefore, even when a tensile shear adhesive strength test was conducted on the polished surface, the thin skin peeled off, and the original tensile shear adhesive strength of the adhesive was not exhibited. Thus, it can be understood that the member bonding method of the present invention is more effective than the methods of Comparative Examples 4 to 7.

Industrial Applicability

[0040] The member bonding method of the present invention can be used in production facilities such as factories, and can also be used in all kinds of buildings such as warehouses and gymnasiums.

Explanation of Reference Numerals

[0041] 100 Grinding wheel 101 Rotating body (of the grinding wheel) 102 Grinding cloth (of the grinding wheel) 103 Axial hole (of the grinding wheel) 104 Rotating shaft EM Main member ES Sub-member

Claims

1. A method for adhering a member to a steel material having an oxide film formed on its surface, comprising: a polishing determination step of comparing the oxide film ultimate tensile strength with a preset design tensile strength between the steel material and the member, and determining that polishing of the oxide film portion is necessary when the oxide film ultimate tensile strength is lower than the design tensile strength; a polishing step of polishing the oxide film portion with a polishing wheel when it is determined in the polishing determination step that polishing is necessary; a coating step of applying an adhesive to the surface of the steel material and / or the member; wherein the polishing wheel includes a rotating body and a plurality of polishing cloths attached to the outer periphery of the rotating body; the oxide film ultimate tensile strength is the tensile strength when the member adhered with an adhesive to the steel material having an oxide film formed on its surface peels off; the member is adhered to the steel material via the applied adhesive; A member adhesion method characterized by the above.

2. Further comprising a test step of measuring the oxide film ultimate tensile strength by adhering the member to the steel material having an oxide film formed on its surface with an adhesive and performing a tensile test on the member; in the polishing determination step, comparing the oxide film ultimate tensile strength measured in the test step with the design tensile strength; The member adhesion method according to claim 1, characterized by the above.

3. In the polishing step, when a white turbidity layer is visually confirmed, polishing is performed by changing the rotational speed of the rotating body and / or using the polishing wheel including polishing cloths having different mesh sizes. The member adhesion method according to any one of claims 1 and 2, characterized by the above.

4. Further comprising a rotational speed planning step of setting a planned rotational speed of the rotating body according to the roughness of the polishing cloth to be used; in the polishing step, rotating the rotating body at the planned rotational speed; in the rotational speed planning step, setting the planned rotational speed within a range of 500 rpm to 5000 rpm; The member adhesion method according to any one of claims 1 to 3, characterized by the above.

5. In the polishing step, polishing is performed using the polishing wheel including the polishing cloth having a mesh size of #40 to #120; The member adhesion method according to any one of claims 1 to 4, characterized by the above.

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