Manufacturing method for coils used in heat peeling devices

Abstract

To provide a manufacturing method of a coil for heat-peeling devices which can be sufficiently cooled by cooling of air-cooling.SOLUTION: A manufacturing method of a coil for heat-peeling devices includes a winding-up step (S1), a coating step (S2), and an extraction step (S3). In the winding-up step (S1), a big strand obtained by further twisting together a plurality of small strands configured by twisting together a plurality of enamel wires, in which insulation coating is applied to a conductor material, is wound up on an outer peripheral surface of a cylindrical winding frame together with a fluororesin sheet. In the coating step (S2), a caulking material is applied to both the big strand in a wound state and the fluororesin sheet. In the extraction step, only the fluororesin sheet is extracted from the big strand, which is hardened in the wound state with drying of the caulking material, and the fluororesin sheet. In the winding-up step, the fluororesin sheet is wound up simultaneously with the big strand while being disposed at an opposite side of a side turned toward the outer peripheral surface of the winding frame in the big strand.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a coil for a heat peeling device.

Background Art

[0002] Conventionally, a heat peeling device has been proposed that heats a metal having a coating film formed on its surface to facilitate peeling of the coating film (see, for example, Patent Document 1). In Patent Document 1, a heat peeling device (1) includes a coil portion (20) in which a coil body (21) formed by winding a conducting wire in a planar shape is held in its shape by shape holders (22, 23), and a high-frequency generator (10) connected to the coil body (21) for generating a high-frequency voltage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the temperature of the wound coil used in the heat peeling device rises with use. Therefore, it must be cooled so that the wound coil does not burn. As a cooling method for the wound coil, a water-cooling type is generally used.

[0005] However, since the heat peeling device is used while moving outdoors, if a relatively large-scale water-cooling type is adopted, it becomes difficult to move and the workability is significantly reduced.

[0006] On the other hand, since the wound coil provided in the heat peeling device is wound in a close contact state, there is a problem that the wound coil cannot be sufficiently cooled if an air-cooling type is adopted.

[0007] Therefore, the present invention aims to provide a method for manufacturing a coil for a heating and peeling device that can be sufficiently cooled by air cooling. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides a method for manufacturing a coil for a heat peeling device, comprising: a winding step of winding a large stranded wire, which is made by twisting together a plurality of small stranded wires, each of which is made by twisting together a plurality of enameled wires coated with an insulating film on a conductor material, onto the outer surface of a cylindrical winding frame together with a fluororesin sheet; a coating step of applying a sealant to both the large stranded wire and the fluororesin sheet in the wound state; and a removal step of removing only the fluororesin sheet from the large stranded wire and the fluororesin sheet, which have hardened in the wound state as the sealant dries, wherein in the winding step, the fluororesin sheet is wound simultaneously with the large stranded wire, with the fluororesin sheet positioned on the opposite side of the large stranded wire from the side facing the outer surface.

[0009] In the winding process, it is preferable to place a guide sheet between the large stranded wire and the fluororesin sheet to facilitate winding the large stranded wire onto the outer surface, and to wind the large stranded wire, the guide sheet, and the fluororesin sheet onto the outer surface simultaneously.

[0010] Furthermore, during the winding process, it is preferable that the large stranded wire is subjected to a compressive pressure in the radial direction from the cylindrical axis of the winding frame. [Effects of the Invention]

[0011] According to the method for manufacturing a coil for a heat-sealing device of the present invention, in the extraction process, only the fluororesin sheet is extracted from the large stranded wire and fluororesin sheet that have hardened in a wound state as the caulking material dries. As a result, a gap equal to the thickness of the extracted fluororesin sheet is formed in the large stranded wire that has hardened in a wound state. Consequently, air blown from a fan passes through the gap formed in the large stranded wire, making it possible to reliably cool the large stranded wire. In other words, according to the method for manufacturing a coil for a heat-sealing device of the present invention, it is possible to sufficiently cool the coil for the heat-sealing device by air cooling.

[0012] Furthermore, the specific steps for manufacturing a coil for a heating and peeling device that can be sufficiently cooled by air cooling are not described at all in the aforementioned Patent Document 1. [Brief explanation of the drawing]

[0013] [Figure 1] A flowchart showing each step in the manufacturing method of a coil for a heat peeling device according to an embodiment of the present invention. [Figure 2] A schematic diagram showing how the coil is wound onto the outer surface of the winding frame. [Figure 3] A cross-sectional view showing the large stranded wire wound onto a reel, the guide sheet, and the fluororesin sheet. [Figure 4] A cross-sectional view showing the state after removing the fluororesin sheet from Figure 3. [Figure 5] A diagram showing an example of a coil for a heat-sealing device manufactured by the method for manufacturing coils for heat-sealing devices. [Modes for carrying out the invention]

[0014] <1. Embodiments> A method for manufacturing a coil for a heat-based peeling device according to an embodiment of the present invention will be described with reference to Figures 1 to 5. The method for manufacturing a coil for a heat-based peeling device according to the present invention is a method for manufacturing a coil specifically for a heat-based peeling device that heats a metal on which a coating film has been formed to make the coating film easier to peel off.

[0015] As shown in FIG. 1, the method for manufacturing a coil for a heat release device includes three steps: a winding-up step of step S1, an application step of step S2, and a extraction step of step S3.

[0016] The winding-up step (S1) is a step of winding up the coil 2, which will be described in detail later, in a disk shape around the winding frame. As shown in FIG. 2, by rotating the cylindrical winding frame 1 in a predetermined direction, the coil 2 is wound up on the outer peripheral surface 11 of the winding frame 1. As shown in FIG. 5, the coil 2 wound up a plurality of times (a plurality of turns) is formed in a disk shape in a side view.

[0017] In the winding-up step (S1), a large-stranded wire formed by further twisting a plurality of small-stranded wires obtained by twisting a plurality of enameled wires having an insulating coating applied to a conductor material is used for the coil 2 wound up on the outer peripheral surface 11 of the winding frame 1. In this embodiment, the coil 2 is an example of the "large-stranded wire" according to the present invention.

[0018] In this embodiment, as the small-stranded wire, a wire obtained by twisting 1,200 enameled wires is adopted. Also, as the large-stranded wire, a wire obtained by twisting 9 small-stranded wires is adopted.

[0019] In the winding-up step (S1), the coil 2 (large-stranded wire) is wound up on the outer peripheral surface 11 of the winding frame 1 together with the guide sheet 3 and the fluororesin sheet 4.

[0020] The guide sheet 3 is a sheet for facilitating winding on the outer peripheral surface 11 of the winding frame 1. For example, a polyimide tape (polyimide sheet) having heat resistance is used for the guide sheet 3.

[0021] The fluororesin sheet 4 is a sheet for forming a gap in the wound-up coil 2 by being extracted in the extraction step (S3) described later. Here, an example is given where the fluororesin sheet 4 has a thickness of about 1 mm (millimeter).

[0022] As shown in Figure 3, during the winding process (S1), the coil 2, guide sheet 3, and fluororesin sheet 4 are simultaneously wound outwards from the outer surface 11 of the winding frame 1 in that order.

[0023] In other words, during the winding process (S1), the guide sheet 3 and the fluororesin sheet 4 are positioned on the side of the coil 2 opposite to the side facing the outer surface 11 of the winding frame 1. The guide sheet 3 is positioned between the coil 2 and the fluororesin sheet 4. The coil 2, guide sheet 3, and fluororesin sheet 4 are then wound simultaneously onto the outer surface 11 of the winding frame 1.

[0024] Furthermore, during the winding process (S1), pressure is applied to the coil 2 in the radial direction from the cylindrical shaft 13 of the winding frame 1, compressing the coil 2. As a result, as shown in Figure 3, the coil 2, which initially had a circular cross-section, is compressed radially from the cylindrical shaft 13 of the winding frame 1 and shaped into a roughly rectangular cross-section. After compression, the coil 2 has a width of approximately 4.5 mm in the compression direction and approximately 12 mm in the width direction.

[0025] Furthermore, in this embodiment, the coil is wound up approximately 13 times during the winding process (S1). In other words, the coil 2 is formed in 13 layers in the radial direction from the cylindrical axis 13 of the winding frame 1.

[0026] Refer to Figure 1 again. The coating process (S2) is a process of applying silicone sealant to the coil 2, guide sheet 3, and fluororesin sheet 4, which have been wound up in the winding process (S1) and are in a wound state.

[0027] In the coating process (S2), the coil 2, guide sheet 3, and fluororesin sheet 4 are thoroughly immersed in silicone sealant and then allowed to air dry for about a full day. Once the silicone sealant has air dried, the coil 2, guide sheet 3, and fluororesin sheet 4, which are in a wound state, will harden.

[0028] In the extraction process (S3), only the fluororesin sheet 4 is extracted from the coil 2, guide sheet 3, and fluororesin sheet 4, which have hardened in a wound state as the sealant has dried. Since the fluororesin sheet 4 is peelable, it can be extracted relatively easily.

[0029] As described above, the fluororesin sheet 4 has a thickness of approximately 1 mm. Therefore, when the fluororesin sheet 4 is removed, a gap SP of approximately 1 mm is formed in the coil 2, which has hardened in a wound state, as shown in Figure 4. The guide sheet 3 remains attached to the coil 2.

[0030] Figure 5 shows an example of a coil 2 manufactured by the manufacturing method for a heat-sealing device coil described above (steps S1 to S3). As shown in Figure 5, the coil 2 is composed of 13 layers in a disc shape when viewed from the side. In addition, a gap SP of approximately 1 mm (millimeters) is formed between each layer of the coil 2.

[0031] According to the method for manufacturing a coil for a heat peeling device as described above, in the extraction step (S3), only the fluororesin sheet 4 is extracted from the coil 2, guide sheet 3, and fluororesin sheet 4, which have hardened in a wound state as the silicone sealant dries.

[0032] Therefore, a gap SP equal to the thickness of the removed fluororesin sheet 4 is formed between each layer of the coil 2 that has hardened in the wound state. As a result, air blown from a cooling device such as a fan passes through the gap formed between each layer of the coil 2, making it possible to reliably cool the coil 2. In other words, according to the manufacturing method for a coil for a heat peeling device as embodied above, it is possible to sufficiently cool the coil for a heat peeling device by air cooling.

[0033] By the way, in this embodiment, the coil 2 uses a large stranded wire made by further twisting together multiple small stranded wires as described above. Since there are gaps between the multiple small stranded wires that make up the large stranded wire, there is a possibility that it will not be wound straight (it will collapse) when pressure is applied to wind it. In this embodiment, the guide sheet 3 is placed between the coil 2 and the fluororesin sheet 4, and the coil 2, guide sheet 3 and fluororesin sheet 4 are wound simultaneously onto the outer surface 11 of the winding frame 1. Therefore, it is possible to wind the coil 2 straight onto the outer surface 11 of the winding frame 1.

[0034] Furthermore, according to the above-described embodiment, pressure is applied to compress the coil 2 in the radial direction from the cylindrical shaft 13 of the reel 1. The coil 2, which has a circular cross-section, is compressed radially from the cylindrical shaft 13 of the reel 1 and shaped into a substantially rectangular cross-section. As a result, the density of the coil 2 increases, and its self-heating properties can be improved. In addition, the diameter of the final disc-shaped coil 2 in side view can be shortened.

[0035] <2. Variant> The method for manufacturing a coil for a heat peeling device according to the present invention is not limited to the embodiments described above, and various modifications and improvements are possible within the scope described in the claims.

[0036] For example, in the above-described embodiment, the guide sheet 3 is placed between the coil 2 and the fluororesin sheet 4, and the coil 2, guide sheet 3, and fluororesin sheet 4 are wound simultaneously onto the outer surface 11 of the winding frame 1. However, the invention is not limited to this. In the above-described embodiment, the guide sheet 3 is not necessarily an essential component for the present invention. Therefore, for example, the coil 2 and fluororesin sheet 4 may be wound simultaneously onto the outer surface 11 of the winding frame 1 without placing the guide sheet 3 between the coil 2 and the fluororesin sheet 4. [Explanation of Symbols]

[0037] Volume 1 2 coils 3. Information Sheet 4. Fluororesin sheet 11 Outer surface 13. Cylindrical shaft SP gap

Claims

1. A winding process in which multiple small stranded wires, each consisting of multiple enameled wires with an insulating coating applied to a conductor material, are twisted together to form a large stranded wire, which is then wound onto the outer surface of a cylindrical winding frame together with a fluororesin sheet. A coating step of applying a sealant to both the large stranded wire in a wound state and the fluororesin sheet, A extraction step in which only the fluororesin sheet is removed from the large stranded wire and the fluororesin sheet that have hardened in a wound state as the sealant dries, A method for manufacturing a coil for a heat peeling device, including A method for manufacturing a coil for a heat peeling device, characterized in that, in the winding step, the fluororesin sheet is positioned on the opposite side of the large stranded wire from the side facing the outer surface and is wound up simultaneously with the large stranded wire.

2. The method for manufacturing a coil for a heat peeling device according to claim 1, characterized in that, in the winding step, a guide sheet is placed between the large stranded wire and the fluororesin sheet to facilitate winding the large stranded wire onto the outer surface, and the large stranded wire, the guide sheet and the fluororesin sheet are simultaneously wound onto the outer surface.

3. A method for manufacturing a coil for a heat stripping device according to claim 1 or 2, characterized in that, during winding in the winding process, pressure is applied to the large stranded wire to compress it in the radial direction from the cylindrical axis of the winding frame.

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