KR20110009316U - Bobbin - Google Patents

Abstract

The present invention relates to a bobbin for wire winding. The bobbin for winding the wire, the cylindrical core portion in which the wire is wound; And a flange portion coupled to both ends of the core portion and having a diameter larger than an outer diameter of the core portion, wherein the core portion includes: C: 0.001 to 0.15%, Mn: 0.001 to 0.6%, P: 0.001 to 0.05%, and S: Carbon steel pipe containing 0.001 to 0.05% and the balance of Fe and inevitably mixed impurities, the flange portion C: 0.38 to 0.43%, Si: 0.15 to 0.35%, Mn: 0.6 to 0.85%, P : 0.001% to 0.03%, S: 0.001% to 0.03%, Cr: 0.9% to 1.2%, Mo: 0.15% to 0.3%, and the balance is characterized by consisting of a steel plate made of Fe and impurities which are inevitably incorporated.

Description

Bobbin for Wire Winding {Bobbin}

The present invention relates to a bobbin for wire winding, and more particularly, to a winding bobbin, which has a structure that is improved to prevent winding failure by deforming the bobbin on which the wire is wound and to be wound, and to recycle after the unwinding.

The present invention relates to bobbins for wire winding. In particular, the present invention relates to bobbins used for winding spring wires used in various industries such as machinery, agriculture, and piano wire.

1 shows an example of a bobbin 100 for a conventional wire winding. As shown in FIG. 1, the bobbin 100 for a conventional wire winding includes a core barrel 1 and a flange 2.

The core tube 1 is a portion in which the wire 3 is wound on an outer circumferential surface, and is made of a high-pressure pipe which is a general hot rolled steel plate, and the flange portion 2 is coupled to both ends of the core tube 1. The flange portion 2 has a diameter larger than the outer diameter of the core barrel 1, the material is made of the same material as the core barrel (1).

The flange portion 2 is formed by pressing a high pressure pipe and welded to the core barrel portion 1. The core barrel 1 and the flange 2 are ground by welding to remove the protrusion by grinding the welded portion, thereby completing the bobbin. At this time, the thickness W1 of the core portion 1 and the thickness W2 of the flange portion 2 are formed to about 3 mm.

However, conventional wire winding bobbin 100 has the following problems.

As shown in FIG. 2, in the conventional wire winding bobbin 100, both ends of the core barrel 1 extend in the longitudinal direction (arrow A1 direction) by the tension of the wire 3 wound on the core barrel 1. There is a problem that (3) is not uniformly wound. If the wire 3 is not uniformly wound, the wire 3 may be disconnected during winding and unsealing of the wire 3, resulting in enormous losses.

In addition, the conventional bobbin winding wire 100 is the core portion 1 is extended in the longitudinal direction by the tension of the wire 3, the flange portion 2 is bent to the outside (arrow A2 direction), the shape of the bobbin It is severely deformed overall. This severely deformed bobbin has a problem that can not only be discarded after defrosting the wire (3) and can be recycled to significantly increase the manufacturing cost of the bobbin.

The present invention has been made in consideration of the above-described matters, and aims to provide a bobbin for winding the wire which can be re-reduced after minimizing the deformation of the bobbin during the winding of the wire, and desealing the wound wire.

Wire winding bobbin according to the present invention for achieving the above object, the cylindrical core portion to which the wire is wound; And a flange portion coupled to both ends of the core portion and having a diameter larger than an outer diameter of the core portion, wherein the core portion includes: C: 0.001 to 0.15%, Mn: 0.001 to 0.6%, P: 0.001 to 0.05%, and S: Carbon steel pipe containing 0.001 to 0.05% and the balance of Fe and inevitably mixed impurities, the flange portion C: 0.38 to 0.43%, Si: 0.15 to 0.35%, Mn: 0.6 to 0.85%, P : 0.001% to 0.03%, S: 0.001% to 0.03%, Cr: 0.9% to 1.2%, Mo: 0.15% to 0.3%, and the balance is characterized by consisting of a steel plate made of Fe and impurities which are inevitably incorporated.

Here, the core barrel portion and the flange portion is surface-treated with a logwell hardness value (HRc) is preferably 30 to 32.

Here, the core barrel portion and the flange portion is preferably chromium coated.

Here, the core portion thickness is preferably in the range of 9mm ~ 11mm.

Here, the thickness of the flange portion is preferably in the range of 9mm ~ 11mm.

Here, coupling ends projecting outward are formed at both ends of the core barrel, and coupling grooves into which the coupling protrusion is inserted are formed in the flange portion, and an inner circumferential surface of the through hole formed at the center of the flange portion is the center of the core barrel. It is desirable to have an inclined surface whose inner diameter gradually decreases.

Here, when the inclined surface extends toward the inner side of the core portion to form a virtual cone, it is preferable that the vertex inside of the cone is 90 degrees.

The bobbin for wire winding according to the present invention, since the core portion using carbon steel and the flange portion using a steel plate is coupled to the core portion, the deformation of the bobbin due to the tension of the wire is minimized, so that the wire can be uniformly wound. to provide.

In addition, the bobbin for winding the wire according to the present invention, even if the wire is wound on the bobbin, since the deformation of the bobbin is minimized, it provides the effect of recycling the bobbin again after unwinding the wire. Thus, it provides the effect of significantly reducing the cost of the bobbin required to wind the wire once.

In addition, the wire winding bobbin according to the present invention, to form a coupling protrusion in the core portion, and to form a coupling groove into which the coupling protrusion is inserted into the flange portion can easily determine the position when welding the core portion and the flange portion. Make sure

In addition, since the inclined surface of the flange portion is formed such that the cone angle obtained by virtually extending the inclined surface is 90 degrees, the tension of the core tube is properly canceled by the tension of the wire, so that the deformation of the bobbin is minimized. do.

1 is a cross-sectional view of a bobbin for a conventional wire winding.
FIG. 2 is a view schematically showing the deformation of the wire winding in the bobbin of FIG.
3 is a cross-sectional view of a bobbin for a wire winding according to the present invention.
4 is a diagram illustrating an essential part of FIG. 3;
5 and 6 are diagrams schematically showing the wire tension applied to the bobbin according to the angle of the inclined surface formed in the flange portion employed in the present invention.

The present invention relates to a bobbin for winding the wire, and is particularly used for winding spring wire used in various industries such as machinery, agriculture, piano wire.

First, referring to FIG. 3, the wire winding bobbin 200 according to the present invention includes a core barrel 10 and a flange 20.

The core portion 10 is a portion of the wire winding, the center is made of a carbon steel pipe bored. The material of the carbon steel pipe is 0.001 to 0.15% of carbon (C), 0.001 to 0.6% of manganese (Mn), 0.001 to 0.05% of phosphorus (P), and 0.001 to 0.05% of sulfur (S), and the balance thereof. It consists of Fe and impurities which are inevitably incorporated.

In addition, the core barrel 10 is preferably formed to have a thickness of 9mm ~ 11mm. In this embodiment, the core tube 10 has a thickness of about 10 mm. This makes the thickness thicker than the conventional thickness of the bobbin 100 for wire winding (usually formed about 3mm) to prevent deformation of the core portion 10 of the bobbin by the tension of the wire when the wire is wound.

The carbon steel pipe used in the present invention is a carbon content of 0.15% or less of low carbon steel, the amount of carbon is relatively small, and cold working increases the strength. In general, low carbon steel is excellent in cold workability in the production of the target steel, thin steel sheet, steel wire and the like.

Manganese (Mn) contained in the carbon steel pipe facilitates high temperature processing, and increases strength, hardness, and toughness. In addition, the phosphorus (P) contained in the carbon steel pipe increases hardness and strength and improves machinability. In addition, sulfur (S) contained in the carbon steel pipe is mixed with the manganese (Mn) to improve the machinability.

The flange portion 20 is a steel plate coupled to both ends of the core portion 10, it is welded to the core portion 10. The flange portion 20 is 0.38 to 0.43% of carbon (C), 0.15 to 0.35% of silicon (Si), 0.6 to 0.85% of manganese (Mn), 0.001 to 0.03% of phosphorus (P), and 0.001 to 0.03% of sulfur (S). %, Chromium (Cr) 0.9 to 1.2%, molybdenum (Mo) 0.15 to 0.3%, the balance is composed of Fe and inevitable impurities.

In addition, the flange portion 20 is preferably formed to have a thickness of 9mm ~ 11mm like the core barrel 10. In this embodiment, the flange portion 20 is formed to have a thickness of about 10mm. This is thicker than the conventional thickness of the bobbin 100 for wire winding (usually formed about 3mm) to prevent the flange portion 20 from bending outward by the tension of the wire when the wire is wound. In addition, the inside of the edge of the flange portion 20 is provided with a rounded round portion 25 to prevent the wire is disconnected during unwinding of the wire.

The flange portion 20 used in the present invention contains 0.38 to 0.43% of carbon (C), and is suitable for bobbins requiring large strength. Silicon (Si) included in the flange portion 20 increases the hardness elastic limit and tensile strength of the steel. In addition, the sulfur (S), manganese (Mn), phosphorus (P) provides the same effect as described in the heart pain (10).

In this embodiment, the portion where the inner barrel 10 and the inner surface of the flange portion 20 are in contact with each other 360 degrees to form a weld 40. When performing welding of the core barrel 10 and the flange 20, in order to facilitate the coupling position of the core barrel 10 and the flange 20, the coupling protrusion 11 is attached to the core barrel 10. ) Is formed, the coupling portion 22 is formed in the flange portion (20).

The coupling protrusion 11 protrudes outward from both ends of the core barrel 10, and the coupling groove 22 is formed on the inner side of the flange portion 20 so that the coupling protrusion 11 is inserted therein.

After the core portion 10 and the flange portion 20 are welded to each other, a surface heat treatment is performed so that the logwell hardness (HR) is 30 to 32.

Rogwell hardness is a method of calculating the hardness value. Rogwell hardness is a diamond cone for a hard material and a steel ball for a soft material. Calculate the hardness. The measurement is relatively simple and is used to test materials and products. It is tested using a load less than Brinel Hardness, also called a surface test. It is widely used to measure the strength of thin metal plates or heat-treated heat-treated steel. Depending on the expected range of hardness, light metals use the B scale and, in the case of more rigid, the C scale.

The hardness value applied in this example is a value measured on a C scale, and HRC (Rockwell hardness measured on a C scale) is in a range of 30 to 32. If the HRC is less than 30, the material is soft, which increases the inner width of the bobbin during wire winding, and the number of times of recyclable use is reduced by more than 50% from the above 30 to 32 range. On the other hand, if the HRC is 32 or more, the material is strong, so that the inner width of the bobbin during wire winding is reduced, but there is a fear that the bobbin may be broken.

After the heat treatment, the core barrel portion 10 and the flange portion 20 are surface treated by automatic lathe processing. Specifically, rough grinding is performed to roughly process the surface at 1 μm Ra or more, and then finish finishing is performed smoothly to about 0.2 μm to 0.5 μmRa.

Subsequently, the outer circumferential surfaces of the core barrel 10 and the flange 20 are coated with chromium. The chromium coating imparts high hardness, improves the life of the bobbin, and prevents cracking of the core barrel 10 and the flange 20.

Meanwhile, the wire winding bobbin 200 according to the present invention further includes an inclined surface 24 in the flange portion 20.

The inclined surface 24 is formed on the inner circumferential surface of the through hole 23 formed in the center of the flange portion 20, the inner diameter is formed to be smaller toward the center of the core barrel (10). When the inclined surface 24 extends the inclined surface 24 toward the inner side of the core portion 10 to form a virtual cone, the vertex inner angle θ1 of the cone forms 90 degrees. Of course, the inner angle θ1 may be smaller than or larger than 90 degrees, but forming the inner angle θ1 at 90 degrees may effectively cancel the tension of the wire. This will be described in more detail below.

5 and 6 are diagrams schematically showing the wire tension on the bobbin according to the angle of the inclined surface 24 formed in the flange portion 20 employed in the present invention.

FIG. 5 illustrates a case in which the inner angle of the virtual cone obtained by extending the inclined surface 24 to the inside of the core barrel 10 is formed at 90 degrees, and FIG. 6 illustrates a case in which the inclined surface 24 is formed so as to have an inner angle smaller than 90. to be.

As shown in FIG. 5, when the wire is wound after the gripping member 30 is inserted into the bobbin 200, the tension of the wire at the contact point between the core portion 10 and the flange portion 20 is represented by F1 and Given by F2. F1 and F2 act in opposite directions toward the inside of the core tube 10. When F1 and F2 are decomposed, F1 is the component force F11 (= F1 * cos45 °) acting inwardly of the core portion 10 in parallel with the inclined surface 24 and the component force acting in the direction perpendicular to the inclined surface 24. Decomposes to F12 (= F1 * cos45 °). On the other hand, similarly to F2, the component force F21 (= F2 * cos45 degrees) which acts inwardly of the core part 10 in parallel with the inclined surface 24, and the component force F22 (= F2 which acts in the direction perpendicular to the inclined surface 24). * cos45 °).

At this time, the F1 and F2 are given by the tension of the wire, the size is the same, F11 and F22 are the same size and act in opposite directions, F12 and F21 are also the same size and act in opposite directions . Therefore, the tensions of the wires cancel each other so that the force for extending the core portion 10 in the longitudinal direction is effectively canceled out.

On the other hand, referring to Figure 6, the wire winding bobbin 300 according to the present embodiment shows a case where the virtual cone angle obtained by extending the inclined surface 24 of the flange portion 20 is smaller than 90 degrees.

As shown in Fig. 6, the tension of the wire at the contact point of the core portion 10 and the flange portion 20 is schematically given by F3 and F4. Like F1 and F2, F3 and F4 act in the opposite directions toward the inside of the core portion 10. When the force decomposition of F3 and F4 is carried out, F3 is decomposed | disassembled into the component force F31 which acts in the inside of the core part 10 in parallel along the inclined surface 24, and the component force F32 which acts in the direction perpendicular | vertical to the inclined surface. Similarly, F4 is decomposed | disassembled into the component force F41 which acts in the inside of the core part 10 parallel to the inclination surface 24, and the component force F42 which acts in the direction perpendicular | vertical to the inclination surface 24. As shown in FIG.

At this time, F31 and F42, and F32 and F41 are different in size, and their directions are also different. Since | F32 |> | F41 | and | F42 |> | F31 |, the core part 10 is subjected to a force extending outwardly of both ends as a whole. Therefore, as in the embodiment 300 according to FIG. 6, when the virtual cone angle θ2 formed by the inclined surface 24 of the flange portion 20 is smaller than 90, there is a possibility that the bobbin is deformed by the tension of the wire. It becomes bigger.

Hereinafter, the degree of deformation of the bobbin when the wire is wound on the wire winding bobbin 200 according to the above configuration will be described in detail with reference to [Table 1] to [Table 5].

First, the specifications of the bobbin for wire winding 200 according to the present invention is given as shown in Table 1 below. The alphabet shown in [Table 1] represents the dimensions of the portion denoted by the alphabet of FIG. Use mm as unit.

Unit: mm A B D E F G H I weight Remarks (Primary
Weight of bobbin) 199.9 314.92 314.85 334.8 150.1 169.9 27 9.9 21.5KG 9.5 kg

The bobbin for wire winding 200 employed in the embodiment of the present invention has an inner width D of 314.85 mm and an outer width E of 334.8 mm before winding the wire. In addition, the outer diameter of the core part 10 is 169.9 mm, and the inner diameter F is 150.1 mm. Therefore, the thickness of the core part 10 is 9.9 mm, and the thickness of the flange part 20 is 9.975 mmm. The total weight of the bobbin for wire winding 200 according to this embodiment is 21.5 kg, which is about 2.26 times heavier than the total weight of the conventional bobbin 100 of 9.5 kg. In the present embodiment, the thickness of the core barrel 10 and the flange 20 is about 10 mm, which is determined in consideration of the manufacturing cost and the number of recycling of the bobbin. If the thickness is too thick, the manufacturing cost increases, and the thickness is increased. When the thinner than the conventional bobbin 100 causes the deformation of the bobbin, experimentally proved to be suitable to manufacture a thickness of about 10mm.

[Table 2] below is data obtained by measuring the deviation (D1) from the inner width of the bobbin after winding 13 times by winding the bobbin for wire winding 200 according to the present invention manufactured to the specifications of [Table 1]. . Four bobbins for the sample were used in this experiment. When the method of obtaining data is demonstrated roughly, the inner width of the bobbin after winding for each sample was measured, and it repeated 13 times and calculated the average value A1. Moreover, after winding a wire to Samples 1-4, the average value A2 of the bobbin inner width of Samples 1-2 was computed every time. Moreover, the deviation D1 from the inner width of an initial bobbin was computed every time based on the said average value A2. The unit is mm and the tension of the wire wound on each bobbin is 400 g.

Unit: mm, Wire tension: 400g division Inner width after winding Sample 1 Sample 2 Sample 3 Sample 4 Average (A2) Deviation (D1) 1st round 316.54 316.58 316.62 316.58 316.58 1.73 2nd round 316.55 316.56 316.6 316.59 316.575 1.535 3rd round 316.49 316.52 316.57 316.54 316.53 1.4625 4th round 316.76 316.77 316.51 316.82 316.715 1.6025 5th round 316.82 316.64 316.62 316.4 316.62 1.4975 6th round 316.64 316.75 316.71 316.51 316.6525 1.5125 7th round 316.51 316.81 316.75 316.73 316.7 1.61 8th round 316.62 316.42 316.72 316.68 316.61 1.6475 9th 316.67 316.38 316.66 316.58 316.5725 1.55 10th 316.58 316.62 316.71 316.4 316.5775 1.585 11th round 316.87 316.83 316.68 316.77 316.7875 1.71 12th round 316.78 316.76 316.79 316.59 316.73 1.705 13th round 316.79 316.65 316.8 316.77 316.7525 1.7225 Average (A1) 316.66 316.63 316.67 316.61 316.64 1.6

According to the said Table 2, for example, the inner width after the 1st round winding of the sample 1 is 316.54 mm, the inner width after the 13th round winding is 316.79 mm, and the average value of the 1st to 13th rounds is 316.66 mm. And the inner width after the 1st round winding of sample 1 is 316.54 mm, the inner width after the 1st round winding of sample 2 is 316.58 mm, the inner width after the 1st round winding of sample 3 is 316.62 mm, and the 1st round of sample 4 The inner width after the winding is 316.58 mm. In the first round of the samples 1 to 4, the inner width average width after the winding was 316.58 mm, and the deviation D1 was 1.73 mm from the inner width of the initial bobbin 314.85 mm.

[Table 3] below is the data obtained by experimentally obtaining the degree of deformation of each sample bobbin after decoiling the wire wound on each sample bobbin. [Table 3] is obtained by deciphering the wire from the bobbin for each sample in the process of obtaining [Table 2], and then measuring the inner width of the bobbin. For each sample, the inner width of bobbin was measured after sea voyage, and the average value A3 of 13 times was computed, and the inner width average value A4 of the sea voyage of samples 1-4 was computed every time. And the deviation D2 from the inner width of the initial bobbin was computed based on the said average value A4.

Unit: mm, Wire tension: 400g division Inner width after the sea area Sample 1 Sample 2 Sample 3 Sample 4 Average (A4) Deviation (D2) 1st round 314.99 315.05 315.08 315.04 315.04 0.19 2nd round 315.03 315.04 315.11 315.09 315.0675 0.2175 3rd round 314.98 315.19 315.12 315.16 315.1125 0.2625 4th round 315.14 315.12 315.07 315.16 315.1225 0.2725 5th round 315.19 315.23 315.2 314.94 315.14 0.29 6th round 315.14 315.09 315.18 314.95 315.09 0.24 7th round 314.81 314.97 315.02 315.05 314.9625 0.1125 8th round 315.1 315.06 315.08 314.85 315.0225 0.1725 9th 315.08 315.02 315.06 314.81 314.9925 0.1425 10th 315.06 315.18 315.13 314.94 315.0775 0.2275 11th round 315.11 315.09 315 314.9 315.025 0.175 12th round 315.02 315.06 314.89 315.15 315.03 0.18 13th round 315.05 315.13 315.07 314.88 315.0325 0.1825 Average (A3) 315.05 315.09 315.07 314.99 315.05 0.2

According to the said Table 3, for example, the inner width after the 1st round sea zone of the sample 1 is 314.99 mm, the inner width after the 13th sea zone is 315.05 mm, and the average after the sea zone of the 1st to 13th rounds is 315.05 mm. And the inner width after the 1st round voyage of sample 1 is 314.99 mm, the inner width after the 1st round voyage of sample 2 is 315.05 mm, the inner width after the 1st round voyage of sample 3 is 315.08 mm, and the 1st round of sample 4 The width after the sea is 315.04 mm. The inner width average after the sea area in the first round of the samples 1 to 4 was 315.04 mm, and had a deviation D2 of 0.19 mm from the inner width of the first bobbin of 314.85 mm.

Table 4 below shows the tension of the wire and the amount of bobbin change after winding the wire bobbin 200 according to the conventional bobbin 100 and the present invention.

division fairyland Unit Bobbin weight Winding weight wire
tension Bobbin
Gap Conventional bobbin 0.14mm 720 km 9.5 kg 86.9 kg 300 g 3.441 mm This invention 21.5 kg 400 g 1.605mm

As shown in Table 4, the bobbin for wire winding 200 and the conventional bobbin 100 according to the present invention is a wire diameter of 0.14mm and a unit length of 720Km winding wire. The winding weight of the wire is the same as 86.9kg, the tension of the wire at the time of winding will be recommended to the conventional bobbin 100 300g, the bobbin 200 according to the present invention 400g. As a result of measuring the gap of the bobbin after winding, the conventional bobbin 100 was 3.441 mm, and the bobbin 200 of the present invention was measured at 1.605 mm. At this time, the 1.605mm represents the average value when the winding 13 times to the bobbin 200 according to the present invention.

From Table 3 and Table 4, it can be seen that the bobbin for wire winding 200 according to the embodiment of the present invention has an average deviation of 1.6 mm. This is a reduction of more than two times compared to the 3.44 mm inner width change amount of the bobbin for wire 100 conventional. In particular, in the case of the conventional wire winding bobbin 100, the tension of the wire is wound to 300g, the wire wound on the wire winding bobbin 200 according to the present invention is to be wound with a tension of 400g. That is, even if the winding by applying more than 1.3 times the tension it can be seen that the change in the bobbin inner width is reduced by more than two times.

In addition, the present invention was carried out 13 times for each sample and winding, the effect that can be recycled by performing a plurality of winding and pistol compared with the conventional bobbin 100 is severely deformed by one winding and impossible to recycle. To provide.

Table 5 below shows that the applicant economically calculated this effect.

Production cost When you use 15 times
Cost 1 time
Cost 1 time
Savings Conventional bobbin KRW 68,500 / EA 1,027,500 won KRW 68,500 38,570 won This invention 449,000 KRW / EA 449,000 won 29,930 KRW

The manufacturing cost of the conventional bobbin 100 takes approximately 68,500 won per piece, the manufacturing cost of the bobbin 200 according to the present invention takes 449,000. Conventional bobbin 100 is discarded by one use, assuming that the bobbin 200 according to the present invention used 15 times, conventional bobbin 100 per one takes 68,500 won, bobbin according to the present invention ( Since 200) costs 29,930 won, it is found that the cost of 38,570 won per hour can be saved.

As such, in the bobbin for wire winding 200 according to the embodiment of the present invention, since the core portion 10 is formed of carbon steel pipe and the flange portion 20 is formed of steel sheet, the length of the core portion 10 is due to the tension of the wire. Direction or to minimize the bending of the flange portion 20 to the outside so that the wire can be uniformly wound. In addition, by winding the wire uniformly, it is possible to prevent the wire from being broken during winding and unwinding.

In addition, since the deformation of the bobbin due to the wire tension is minimized, the bobbin can be recycled again after sea-sealing, thus providing a significant reduction in the cost of the bobbin required for one winding.

In addition, the wire winding bobbin according to the present invention, since the coupling protrusion 11 of the core barrel 10 can be welded in the state inserted into the coupling groove 22 of the flange portion 20, the core barrel 10 ) And the flange portion 20 can be welded in a state in which the position of the flange 20 is easily and accurately determined.

In addition, in the preferred embodiment, the inclined surface 24 formed on the flange portion 20 is formed such that the vertex angle of the cone obtained by virtually extending the inclined surface 24 is 90 degrees, so that the core portion 10 is extended in the longitudinal direction. It effectively cancels the tension of the stretching wires to minimize deformation of the bobbin.

As mentioned above, although the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiment, and many other various modifications may be provided without departing from the scope of the present invention. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached utility model registration claims.

10 ... cardiac pain 11 ... engaging projection
20 ... Flange 22 ... Coupling groove
23 ... through hole 24 ... slope
25 ... round 40 ... welded

Claims (7)

A cylindrical core tube portion in which a wire is wound; And
A flange portion coupled to both ends of the core portion and having a diameter larger than an outer diameter of the core portion;
The core part is made of a carbon steel pipe containing C: 0.001 to 0.15%, Mn: 0.001 to 0.6%, P: 0.001 to 0.05%, S: 0.001 to 0.05%, and the balance is made of Fe and impurities inevitably incorporated. , The flange portion C: 0.38 ~ 0.43%, Si: 0.15 ~ 0.35%, Mn: 0.6 ~ 0.85%, P: 0.001 ~ 0.03%, S: 0.001 ~ 0.03%, Cr: 0.9 ~ 1.2%, Mo: 0.15 ~ The bobbin for wire winding containing 0.3% and remainder consisting of the steel plate which consists of Fe and the impurity mixed inevitable. The method of claim 1,
The core portion and the flange portion is surface heat-treated bobbin for wire winding, characterized in that the logwell hardness value (HRc) is 30 to 32. The method of claim 1,
The core portion and the flange portion bobbin for wire winding, characterized in that the chromium coating. The method of claim 1,
Bobbin wire winding, characterized in that the thickness of the core portion is in the range of 9mm ~ 11mm. The method of claim 1,
The thickness of the flange portion is bobbin for wire winding, characterized in that in the range of 9mm ~ 11mm. The method of claim 1,
Coupling protrusions protruding outward are formed at both ends of the core barrel portion, and coupling grooves for inserting the coupling protrusions are formed in the flange portion.
The inner circumferential surface of the through hole formed in the center of the flange portion has a bobbin for winding the wire, characterized in that the inner diameter is reduced toward the center of the core tube portion. The method of claim 6,
When the inclined surface extends toward the inner side of the core barrel portion to form a virtual cone, the vertex inside of the cone is 90 degrees wire winding bobbin, characterized in that.

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