Rivet coating film peeling method

Abstract

To provide a rivet coating film peeling method that can easily peel off a coating film formed on the head surface of a rivet.SOLUTION: A rivet coating film peeling method according to the present invention includes a heating step to heat the coating film formed on the head surface of a rivet that joins to-be-joined objects, and a peeling step in which a rivet scraper including a cylindrical member is used to peel off the coating film on the rivet head surface that has been softened in the heating step. In the peeling step, with all or part of the tip end of the cylindrical member, which constitutes the rivet scraper, being in contact with the head surface of the rivet or its vicinity, the cylindrical member is manually rotated in the circumferential direction, thereby peeling off the coating film on the rivet head surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for removing a coating film from a rivet, and more particularly to a method for removing a coating film formed on the head surface of a rivet. [Background technology]

[0002] Conventionally, there have been proposed techniques for removing the previously painted surface of bolts and nuts used to connect members in architectural structures such as iron bridges before repainting. For example, Patent Document 1 discloses a paint and rust removing device that includes a stripping section having a steel stripping section body and a stripping blade formed by engraving an uneven shape, a cylindrical space in the axial direction of the stripping section, and a rotating member that fits into the cylindrical space. In this paint and rust removing device, the stripping section is configured to be rotatable by the rotating member with the axial direction as the rotation axis.

[0003] Another technique proposed is to heat the coating film formed on the outer peripheral surface to soften it, and peel off the softened coating film in a sheet-like lump.For example, Patent Document 2 discloses a method in which the heating head of an induction heating device is applied to the coating film on the outer peripheral surface of a wrapping wire in a main cable of a suspension bridge, the wrapping wire is heated by induction heating using the induction coil of the heating head, the coating film on the wrapping wire is softened, and the softened coating film is peeled off in a sheet-like lump or other lump form. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3157391 [Patent Document 2] JP 2017-140607 A Summary of the Invention [Problem to be solved by the invention]

[0005] Rivets are sometimes used to connect members in architectural structures such as iron bridges. A rivet is a component that consists of a body without a head or thread, and is inserted into a member with a hole and crimped with a special tool to plastically deform the opposite end and join the members. The head of a rivet is formed in an approximately hemispherical shape, unlike the head of a bolt, which is hexagonal. Therefore, it is difficult to remove the coating from the rivet head using the paint / rust removal device described in the above-mentioned Patent Document 1.

[0006] Furthermore, although the above-mentioned Patent Document 2 discloses softening the coating film by heating, the softened coating film had to be peeled off separately from the outer circumferential surface using a scraper, etc. However, because the scraper blade is formed in a straight line, it is difficult to bring it into close contact with the roughly hemispherical rivet head, which creates the problem that it is difficult to peel off the coating film from the rivet head.

[0007] Therefore, an object of the present invention is to provide a method for removing a coating film from a rivet that can easily remove a coating film formed on the head surface of a rivet. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a rivet coating peeling method comprising a heating step of heating a coating formed on the head surface of a rivet that joins objects to be joined, and a peeling step of using a rivet scraper including a cylindrical member to peel off the coating from the head surface that has been softened in the heating step, wherein in the peeling step, the cylindrical member is manually rotated in the circumferential direction while all or part of the tip end of the cylindrical member is in contact with the head surface or near the head surface, thereby peeling off the coating from the head surface.

[0009] Here, in the peeling process, it is preferable to rotate the cylindrical member while shifting the cylindrical axis of the cylindrical member with respect to the central axis of the rivet with a portion of the tip end of the cylindrical member in contact with the head surface or near the head surface.

[0010] Also, the inside diameter of the cylindrical member is preferably smaller than the outside diameter of the head of the rivet. The present invention also provides a rivet coating peeling method comprising: an application step of applying a peeling agent to the coating formed on the head surface of a rivet that joins objects to be joined; and a peeling step of using a rivet scraper including a cylindrical member to peel off the coating from the head surface that has been softened in the heating step, wherein in the peeling step, the cylindrical member is manually rotated in the circumferential direction while all or part of the tip end of the cylindrical member is in contact with the head surface or near the head surface, thereby peeling off the coating from the head surface. Effect of the Invention

[0011] According to the rivet coating peeling method of the present invention, after heating the coating formed on the head surface of the rivet, the cylindrical member of the rivet scraper is manually rotated in the circumferential direction while all or part of the tip end of the cylindrical member is in contact with the head surface of the rivet or the vicinity of the head surface. As a result, the coating on the head surface of the rivet is gouged out in a substantially circular shape by the tip end of the cylindrical member and peeled off. Therefore, the coating formed on the head surface of the rivet can be easily peeled off.

[0012] Incidentally, the above-mentioned Patent Documents 1 and 2 do not disclose any specific steps of a rivet coating removal method that can easily remove the coating formed on the head surface of a rivet. [Brief description of the drawings]

[0013] [Figure 1] 1A and 1B are schematic diagrams showing the heating step and the peeling steps of the rivet coating film peeling method according to an embodiment of the present invention. [Diagram 2] 1A is a side view and FIG. 1B is a front view (view along arrow A) showing a rivet scraper. [Diagram 3]FIG. 4 is a diagram showing the relationship between the inner diameter of a cylindrical member constituting a rivet scraper and the outer diameter of the head of a rivet. [Figure 4] 5 is a schematic diagram showing the relationship between the cylindrical axis of the rivet scraper and the central axis of the rivet when the cylindrical member rotates. FIG. [Diagram 5] FIG. 2 is a diagram showing how the coating on the surface of a rivet head is peeled off with a rivet scraper. [Figure 6] FIG. 1 is a side view showing a rivet scraper according to a modified example; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] <1. Embodiment> A rivet coating peeling method according to an embodiment of the present invention will be described with reference to Figures 1 to 5. Here, the rivet coating peeling method refers to a method for peeling off a coating formed on the head surface of a rivet. A rivet is a known component that consists of a body portion without a head or threaded portion, and is inserted into a component with a hole and crimped with a dedicated tool to plastically deform the opposite end portion for joining.

[0015] The multiple rivets RV shown in Fig. 5 are used to connect the member SP1 to the member SP2. The head of each rivet RV (the portion of the rivet RV that protrudes toward the surface side of the member SP1) that joins the member SP1 to the member SP2 is painted to form a coating. The members SP1 and SP2 are examples of "objects to be joined" according to the present invention.

[0016] Hereinafter, the rivet coating film peeling method according to the present embodiment will be described in detail with reference to FIG.

[0017] As shown in Fig. 1(A), in the heating step, the coating film formed on the head surface of the rivet RV that joins the objects to be joined is heated using a known heating device (for example, an IH (Induction Heating) type heating device), which softens the coating film formed on the head surface of the rivet RV.

[0018] As shown in Figures 1(B) and (C), in the peeling process, a rivet scraper 1 (see also Figure 2) described below is used to peel off the coating film on the head surface of the rivet RV that has been softened in the heating process.

[0019] As shown in FIGS. 2(A) and (B), the rivet scraper 1 is configured to include a hollow cylindrical member 2 and a spherical gripping portion 3 provided on the base end side of the cylindrical member 2.

[0020] A tapered chamfered portion 2T is formed on the tip end of the cylindrical member 2. The tip end of the cylindrical member 2 comes into contact with the head surface of the rivet RV in the peeling process shown in Figures 1(B) and (C).

[0021] 3, the cylindrical member 2 has a uniform inner diameter D1 from the base end to the tip end. The head of the rivet RV has an outer diameter D2. In this embodiment, the inner diameter D1 of the cylindrical member 2 is smaller than the outer diameter D2 of the rivet RV.

[0022] 1(B) and (C), in the peeling step, first, all or part of the tip end of the cylindrical member 2 is brought into contact with the head surface of the rivet RV. At that time, since the coating film formed on the head surface of the rivet RV has been softened by heating, the contact of the tip end of the cylindrical member 2 causes a cut in the coating film.

[0023] Next, with a part of the tip end of the cylindrical member 2 in contact with the head surface of the rivet RV, the worker operates the gripping portion 3 to manually rotate the cylindrical member 2 in the circumferential direction. Note that the cylindrical member 2 may be rotated in one direction, or may be rotated alternately in both directions.

[0024] In particular, in this embodiment, as shown in Fig. 4, when rotating the cylindrical member 2 in the circumferential direction, the cylindrical member 2 is rotated in the circumferential direction while slightly shifting the cylindrical axis AX of the cylindrical member 2 with respect to the central axis CA of the rivet RV. In other words, the gripping portion 3 is operated to rotate the cylindrical member 2 in the circumferential direction so that the cylindrical axis AX of the cylindrical member 2 draws a circle (so that it performs so-called precession). As a result, the coating film formed on the head surface of the rivet RV is efficiently gouged out and peeled off as a unit.

[0025] According to the embodiment described above, in the peeling step, the cylindrical member 2 is rotated in the circumferential direction with the leading end of the cylindrical member 2 in contact with part of the head surface of the rivet RV. As a result, the coating on the head surface of the rivet RV is gouged out in a substantially circular shape by the leading end of the cylindrical member 2 and peeled off. Therefore, it is possible to peel off the coating formed on the head surface of the rivet RV relatively easily.

[0026] Furthermore, according to the above-described embodiment, when the cylindrical member 2 is rotated in the circumferential direction, the cylindrical member 2 is rotated in the circumferential direction while the cylindrical axis AX of the cylindrical member 2 is slightly shifted relative to the central axis CA of the rivet RV. Therefore, as the cylindrical member 2 rotates in the circumferential direction, the position where the contact pressure of the tip end of the cylindrical member 2 is applied to the head surface of the rivet RV moves sequentially in the circumferential direction. Therefore, it is possible to efficiently peel off the coating formed on the head surface of the rivet RV compared to the case where the cylindrical member 2 is rotated in the circumferential direction with the cylindrical axis AX of the cylindrical member 2 aligned with the central axis CA of the rivet RV.

[0027] Furthermore, according to the embodiment described above, the inner diameter D1 of the cylindrical member 2 is configured to be smaller than the outer diameter D2 of the rivet RV. This makes it easier to bring the tip end of the cylindrical member 2 into contact with all or part of the head surface of the rivet RV.

[0028] 2, the tapered chamfered portion 2T is formed on the tip end of the cylindrical member 2, and the tip end is configured to be sharp. Therefore, when the tip end of the cylindrical member 2 comes into contact, it is possible to reliably make a cut in the coating film.

[0029] <2. Modifications> The rivet coating film removing method according to the present invention is not limited to the above-described embodiment, and various modifications and improvements are possible within the scope of the claims.

[0030] For example, in the above embodiment, as shown in Fig. 4, the case where the rivet scraper 1 is manually rotated while the cylindrical axis AX of the cylindrical member 2 constituting a part of the rivet scraper 1 is shifted from the central axis CA of the rivet RV has been illustrated, but the present invention is not limited to this. The rivet scraper 1 may be manually rotated in a state where the cylindrical axis AX of the cylindrical member 2 is aligned with the central axis CA of the rivet RV.

[0031] In the above embodiment, as shown in Fig. 3, the inner diameter D1 of the cylindrical member 2 is smaller than the outer diameter D2 of the rivet RV, but the present invention is not limited to this. The inner diameter D1 and the outer diameter D2 may be configured to be the same size, or the inner diameter D1 may be configured to be larger than the outer diameter D2.

[0032] In addition, in the above-described embodiment, as shown in FIG. 2, a case where a tapered chamfered portion 2T is formed at the tip end portion of the cylindrical member 2 is illustrated, but this is not limited to this, and the tapered chamfered portion 2T is not necessarily required as long as the cylindrical member 2 itself is configured to be thin.

[0033] In the above embodiment, the coating film on the head surface of the rivet RV is removed using the rivet scraper 1 including the cylindrical member 2 and the gripping portion 3, but the present invention is not limited to this. For example, the coating film on the head surface of the rivet RV may be removed using a simple cylindrical member that does not include the gripping portion 3.

[0034] In the above embodiment, the case where the tip end of the cylindrical member 2 constituting the rivet scraper 1 is brought into contact with the head surface of the rivet RV in the peeling step has been exemplified, but the present invention is not limited to this. For example, if the inner diameter D1 of the cylindrical member 2 is larger than the outer diameter D2 of the rivet RV, the tip end of the cylindrical member 2 may be brought into contact with the vicinity of the head surface of the rivet RV (for example, the outer flat surface of the outer diameter of the head of the rivet RV).

[0035] In the above embodiment, the coating film formed on the head surface of the rivet RV is softened by the heating step, but the present invention is not limited to this. The coating film formed on the head surface of the rivet RV may be softened by a coating step in which a release agent is applied to the coating film. In short, the coating step may be performed instead of the heating step.

[0036] In the above embodiment, the peeling step is performed by using the rivet scraper 1 (see FIG. 2), but the present invention is not limited to this. For example, instead of the rivet scraper 1, a rivet scraper 10 as shown in FIG. 6 may be used to peel off the coating film on the head surface of the rivet RV.

[0037] As shown in Fig. 6, the rivet scraper 10 is configured to include a cylindrical member 2, an inner cylindrical member 20, a covering member 21, a spring SR, and a spherical gripping portion 3 provided on the base end side of the cylindrical member 2. In Fig. 6, the inner cylindrical member 20, the covering member 21, and the spring SR should be represented by dashed lines, but for convenience of explanation, they are intentionally represented by solid lines. Also, the cylindrical member 2 and the gripping portion 3, which are given the same reference numerals, are the same as those of the rivet scraper 1 described above, and therefore explanations thereof will be omitted here.

[0038] The inner cylindrical member 20 is a member that is disposed inside the cylindrical member 2 with a gap between it and the inner surface of the cylindrical member 2 so that its cylindrical axis coincides with the cylindrical axis of the cylindrical member 2. The spring SR is an elastic member that is provided on the base end side of the inner cylindrical member 20 and applies an elastic force to the inner cylindrical member 20 in the cylindrical axis direction. The covering member 21 is a cylindrical member having an inner diameter slightly larger than the outer shape of the inner cylindrical member 20, and is disposed so as to surround the inner cylindrical member 20. The base end side of the covering member 21 is fixed to the grip portion 3. The tip end of the inner cylindrical member 20 has a tapered chamfered portion formed thereon, similar to the cylindrical member 2.

[0039] In the peeling process, when the whole or part of the tip end of the cylindrical member 2 is brought into contact with the head surface of the rivet RV, the whole or part of the tip end of the inner cylindrical member 20 also comes into contact with the head surface of the rivet RV. Here, the elastic force of the spring SR is applied to the inner cylindrical member 20, and the tip end of the inner cylindrical member 20 is pressed against the head surface of the rivet RV by this elastic force. In this state, the worker operates the gripping part 3 to manually rotate the cylindrical member 2 and the inner cylindrical member 20 in the circumferential direction. This causes the coating film formed on the head surface of the rivet RV to peel off. As described above, the covering member 21 is disposed on the outside of the inner cylindrical member 20. Therefore, even if the worker rotates the gripping part 3, the guide effect of the covering member 21 prevents the inner cylindrical member 20 from deviating from the cylindrical axis AX.

[0040] According to the above-described modified example, in the peeling step, not only the tip end of the cylindrical member 2 but also the tip end of the inner cylindrical member 20 comes into contact with the head surface of the rivet RV while being pressed against it. Therefore, the coating film formed on the head surface of the rivet RV is gouged out more efficiently.

[0041] In the above-described modified example, a discharge port (window) for discharging the peeled coating film to the outside may be provided in a part of the outer circumferential side surface of the cylindrical member 2 and a part of the outer circumferential side surface of the inner cylindrical member 20. [Explanation of symbols]

[0042] 1 Rivet scraper 10 Rivet scraper 2 Cylindrical member 20 Inner cylindrical member 2T taper section 3 Gripping part AX Cylindrical shaft CA center axis D1 Inner diameter D2 outer diameter RV Rivet SP1, SP2 parts SR spring

Claims

1. A rivet coating peeling method, comprising the steps of: a heating step of heating a coating film formed on a head surface of the rivet that joins the objects to be joined; A peeling step of peeling off the coating film on the head surface softened in the heating step using a rivet scraper including a cylindrical member; Equipped with A rivet coating peeling method characterized in that, in the peeling step, the cylindrical member is manually rotated in a circumferential direction while all or part of the tip end of the cylindrical member is in contact with the head surface or near the head surface, thereby peeling off the coating on the head surface.

2. The rivet coating peeling method according to claim 1, characterized in that, in the peeling step, the cylindrical member is rotated while shifting the cylindrical axis of the cylindrical member with respect to the central axis of the rivet while a portion of the tip end of the cylindrical member is in contact with the head surface or near the head surface.

3. 3. The method for removing a coating film from a rivet according to claim 2, wherein an inner diameter of the cylindrical member is smaller than an outer diameter of the head of the rivet.

4. A rivet coating peeling method, comprising the steps of: a coating step of applying a release agent to a coating film formed on a head surface of the rivet that joins the objects to be joined; A peeling step of peeling off the coating film on the head surface softened in the heating step using a rivet scraper including a cylindrical member; Equipped with A rivet coating peeling method characterized in that, in the peeling step, the cylindrical member is manually rotated in a circumferential direction while all or part of the tip end of the cylindrical member is in contact with the head surface or near the head surface, thereby peeling off the coating on the head surface.

Images