KR100979465B1 - Method Manufacturing Filament For Electrode Comprising Beading Part - Google Patents

Abstract

The present invention relates to a method for manufacturing an electrode filament (20) comprising a coil portion (21) formed by a spiral and a melting portion (23) formed at both ends of the coil portion (21). A primary coiling step (ST110) of winding a tungsten wire in a spiral to generate a primary coil; A secondary coiling step (ST120) of winding the primary coil in a spiral around the second mandrel to form a coil body by secondary coiling (ST120); A cutting step (ST130) of cutting the coil body 30 generated in the secondary coiling step to generate the coil piece 40; A melting part forming step (ST140) of forming a melting part 23 at both ends of the coil piece 40; The present invention relates to a method for manufacturing an electrode filament comprising the steps of removing the first mandrel and the second mandrel (ST150), and easily controlling the size of the melting part 23 provided at both ends of the filament to a design dimension. Since it can be formed properly, there is no fear of defects caused by the production of the melting part 23, and it is possible to prevent the waste of raw materials consumed by melting the melting part 23, and to form the melting part 23 in a short time. On the other hand, since the longitudinal width of the molten portion 23 can be reduced, there is an effect of minimizing the loss of material required for the molten portion 23.

Electrode, filament, melt

Description

Method for manufacturing filament for electrode having melting part {Method Manufacturing Filament For Electrode Comprising Beading Part}

1 is a schematic perspective view showing a filament for electrodes according to the prior art.

FIG. 2 shows an example of a state in which the electrode filament shown in FIG. 1 is installed.

Figure 3 is a perspective view showing a filament for electrodes according to another conventional technique.

FIG. 4 shows an example of a state in which the filament for electrodes shown in FIG. 2 is installed.

FIG. 5 is an enlarged perspective view of part A of FIGS. 2 and 4.

FIG. 6 illustrates a conventional manufacturing process for filaments for electrodes shown in FIG. 3.

Figure 7 illustrates a method for producing a filament for an electrode according to the present invention.

8 is a cross-sectional view schematically illustrating the cutting process of FIG. 7.

It is a top view for demonstrating the cutter of the cutting process shown in FIG.

10 is a cross-sectional view taken along the line A-A of FIG.

FIG. 11 is a cross-sectional view schematically illustrating the melt forming process of FIG. 7.

* Description of the symbols for the main parts of the drawings *

20: filament 21: coil portion

23 melt part 30 coil body

40: coil piece

The present invention relates to a method for manufacturing an electrode filament having a melting part, and more particularly, since the size of the melting part can be easily adjusted, an error of the melting part size does not occur, and it is possible to form a melting part of a desired size. It is related with the manufacturing method of the filament for electrodes provided with the melting part which does not generate a burr in a cutting surface in a cutting process, and can form a melting part in a short time.

In general, a filament is used as a light source of an illuminating lamp such as an incandescent lamp and a fluorescent lamp, and the filament is manufactured by winding a tungsten wire having a diameter of about 0.025 mm in the form of a coil. At this time, the power consumption of the filament depends on the thickness of the tungsten wire, the diameter of the coil, the pitch of the coil and the like. The reason for using tungsten as the material of the filament, which is the light source body of the lighting lamp, is various because the vapor pressure is very low as 750 mmHg, the melting point is 3382 ° C., which is very high compared to other metals, and the fracture strength is very high. The specific resistance is stable at 5.64 × 10-5 (Ωcm, 300K) and 115.7 × 10-6 (Ωcmm, 3800K), and the radiation characteristics are about 76% better than the black body. . If tungsten having such characteristics is used to produce a filament of an incandescent bulb, its lifespan is approximately 1000 hours or more. At present, tungsten is an ideal material for filament materials. In order to manufacture tungsten wire having such characteristics as filament, first, coils are wound around the mandrel outer circumferential surface using a coil winding machine as a center support using a coil winding machine according to various specifications according to the purpose. Molybdenum wire (molybdenum wire) is mainly used as the mandrel used in this way, but recently, since molybdenum is expensive, coiled tungsten wire may be coiled using an iron core mandrel which is cheaper than molybdenum mandrel.

 1 and 3 are perspective views showing a filament according to the prior art, and FIGS. 2 and 4 show examples of a state in which the filaments shown in FIGS. 1 and 3 are used as electrodes, and FIG. And part A of FIG. 4 is enlarged. 6 shows a manufacturing process of the filament shown in FIG. 3.

As shown in Figs. 1 and 3, the filaments 10 and 20 according to the prior art are formed of coil parts 11 and 21 formed of tungsten wire. The filaments 10 and 20 are generally wound in a primary coil as shown in FIGS. 1, 3, and 5, and are formed of a coil body in which the primary coil is spirally coiled again. The filaments 10 and 20 wound by the primary and secondary coils are fixedly connected to both sides of the support 5 as shown in, for example, FIGS. 2 and 4, and used as a light source body. The filament 10 shown in FIG. 1 has a problem that the coil part is loosened or the filaments 10 are entangled with each other when an external force is applied to both ends during transportation or installation. The melted portion 23 that is melted and solidified at both ends of 20 is formed.

The manufacturing steps of the filament 20 having the melt shown in FIG. 3 will be described with reference to FIG. 6. First, a tungsten wire is spirally wound around a first mandrel (not shown) having a circular or oval cross section. A first coil is formed (ST10). The first coil having the first mandrel inward is spirally wound around a second mandrel (not shown) having a circular or oval cross section again to form a second coil (ST20). And the melting part 23 is formed in the edge part, heating and cutting | disconnecting the coil part 21 which has a primary coil and a secondary coil. After the melting part 23 is formed, the first mandrel and the second mandrel provided inside the first coil and the second coil are corroded with an acid or the like and removed. In the above, the diameter of the molten portion 23 is generally formed in the range of 100 to 110% of the outer diameter of the secondary coil. When the diameter of the melting part 23 is smaller than 100% with respect to the outer diameter of the secondary coil, there is a problem in that a part of the end of the secondary coil is exposed, and when the diameter of the melting part 23 is larger than 110%, the melting part (more than necessary) There is a problem that the loss of material increases due to the larger 23).

Conventionally, after forming the 2nd coil in order to form the melting part 23, the melting part 23 was formed and cut | disconnected, applying a flame, a laser beam, etc., and heating. Therefore, there was a problem that the size of the melted portion 23 is larger than necessary, or formed too small, it is not easy to form the melted portion 23 to the designed dimensions. In addition, there was a problem of locally heating more than necessary by directly applying heat, and therefore, it takes a long time for cooling and the like, and thus, the time required to form the molten portion 23 increases, and thus the molten portion 23 is formed. There was a problem that productivity is not improved because no standard is provided.

The present invention is to solve the problems of the prior art as described above, it is possible to form a molten portion of a size that meets the design dimensions in a short time, there is no fear of defects in the melt portion forming step, the melt portion of a uniform size An object of the present invention is to provide a method for producing a filament for an electrode having a melting part capable of manufacturing a filament having a short time.

According to an aspect of the present invention, there is provided a method for manufacturing a filament for an electrode having a molten part, comprising: a primary coiling step of spirally winding a tungsten wire around a first mandrel to generate a primary coil; A secondary coiling step of spirally winding the primary coil around the second mandrel to produce a coil body that is a secondary coil; A cutting step of cutting the coil body generated in the secondary coiling step to generate a coil piece; A melting part forming step of forming a melting part at both ends of the coil piece; And removing the first mandrel and the second mandrel.

In the cutting step, the coil body is inserted into the upper body portion, the guide hole is formed, the guide body and the through hole is installed downwardly spaced apart from the upper body portion formed through holes; It is installed between the upper body portion and the lower body portion to the lower portion of the upper body portion, the upper recess portion is formed and the fixed cutter having an upper inclined portion having an inclined upper slope to increase the thickness away from the moving cutter around the upper recess portion Supports; A moving cutter is provided toward the fixed cutter, the moving cutter having a lower inclined portion positioned between the upper body portion and the lower body portion and positioned above the lower body portion, the lower recessed portion being inclined to increase in thickness away from the fixed cutter. Let it; It is characterized in that the shear cut between the fixed cutting portion and the moving cutting portion.

In the above, the forming of the melted portion is installed so that the coil piece and the electrode cut in the cutting step are spaced apart from each other, the electrode is connected to the positive (+) of the power supply portion and the coil piece is negative (-) It is connected to the poles, and supplies power while supplying an inert gas around the coil piece and the electrode, characterized in that to form a molten portion.

In the above, the first mandrel and the second mandrel is characterized in that the pure iron.

In the above, when the diameter of the tungsten wire forming the filament is in the range of 0.01 to 0.05 mm, the gap formed between the coil piece and the electrode is in the range of 1.0 to 2.0 mm, and the potential difference between the coil piece and the electrode is 25 to 35 kV. It is maintained in the range, it is characterized in that the current is supplied in the range of 25 to 40A to form a molten portion.

In the above, the inert gas is argon (Ar), when the outer diameter of the coil piece is in the range of 0.5 to 1.5mm, the amount of argon gas supplied around the coil piece and the electrode is characterized in that the range of 20.0 ~ 50.0L per hour do.

Hereinafter, with reference to the drawings will be described in detail with respect to the electrode filament manufacturing method according to a preferred embodiment of the present invention. In the detailed description, the same description as in the prior art is omitted, and the same name is used for the configuration having the same function.

Figure 7 schematically shows a manufacturing step of the electrode filament according to the present invention, Figure 8 is a cross-sectional view schematically showing a cutting process in the manufacturing step according to the present invention, Figure 9 is a plan view for explaining the cutting process FIG. 10 is a cross-sectional view taken along line AA of FIG. 9, and FIG. 11 is a cross-sectional view schematically illustrating a melt forming process in a manufacturing step according to the present invention.

As shown in FIG. 7, a method of manufacturing an electrode filament according to the present invention includes a primary coil in which a tungsten wire is spirally wound around a first mandrel (not shown) having a circular or oval cross section to generate a primary coil. Ring step ST110; A secondary coiling step (ST120) of forming a coil body 30 by spirally winding a primary coil having a first mandrel with an inner spiral around a second mandrel (not shown) having a circular or oval cross section; ; A cutting step (ST130) of cutting the coil body 30 generated in the secondary coiling step to generate the coil piece 40; A melting part forming step (ST140) of forming a melting part 23 at both ends of the coil piece 40; And removing the first mandrel and the second mandrel (ST150).

In the cutting step (ST130) of cutting the coil body 30 to generate the coil piece 40, the coil body 30 is cut by the shear force. As shown in FIG. 8, one side of the coil body 30 is supported by the fixed cutter 120, and the moving cutter 130 is advanced in the direction of the fixed cutter 120 as indicated by the arrow to fix the cutter 120. And the coil body 30 is cut by the shear force generated by the moving cutter 130. In FIG. 8, the protection diagram 110 illustrates an upper body portion in which a guide hole 111 is formed, and 140 is spaced apart from the upper body portion 110 to a lower portion of the upper body portion 110, and a through hole 141 is formed. The lower body is shown. The fixed cutter 120 may be fixed to the lower portion of the upper body portion 110 between the upper body portion 110 and the lower body portion 140. The movable cutter 130 is installed between the fixed cutter 120 and the lower body portion 140, and is movable to the left and right in FIG. 8 to the lower portion of the fixed cutter 120. As shown in FIG. 9, the fixed cutter 120 includes an upper recess 123, and the movable cutter 130 includes a lower recess 133. The coil body 130 is positioned between the upper recess 123 and the lower recess 133 and sheared by the upper recess 123 and the lower recess 133. As shown in FIGS. 9 and 10, the fixed cutter 120 includes an upper inclined portion 121 formed to be inclined around the upper recessed portion 123, and the movable cutter 130 of the lower recessed portion 133. It has a lower inclined portion 131 formed to be inclined around. Therefore, the upper recess 123 and the lower recess 133 is formed in a sharp shape of the end.

The upper inclined portion 121 is formed to increase the thickness of the fixed cutter 120 in a direction away from the moving cutter 130, as shown in Figure 10, the lower inclined portion 131 from the fixed cutter 120 It is formed to increase the thickness of the moving cutter 130 in the direction away. That is, as shown in FIG. 10, the inclination angle θ1 of the upper inclined portion 121 with respect to the vertical line is formed to have an angular range of 10 to 15 ° in the clockwise direction, and the inclination angle θ1 of the lower inclined portion 131 with respect to the vertical line. The inclination angle θ2 is preferably formed to have an angle range of 10 to 15 degrees in the clockwise direction. By having the upper inclined portion 121 and the lower inclined portion 131 as described above to minimize the contact area between the fixed cutter 120 and the moving cutter 130 in contact with the coil body 30, the cutter during the shearing process Deformation occurring in the coil body 30 by the 120 and 130 can be minimized. The gap t1 formed between the bottom surface of the fixed cutter 120 and the top surface of the movable cutter 130 is minimized, and when the movable cutter 130 moves to the fixed cutter 120 in the shearing process, the movable cutter It is also preferable that the upper surface of the 130 is in contact with the bottom surface of the fixed cutter 120. By minimizing the gap t1 as described above, the burr generated on the shear surface during the shear cutting process is minimized.

The melting part forming step ST140 is a step of forming the melting part 23 shown in FIG. 3 at an end portion of the coil piece 40 cut in the cutting step ST130. Melting part forming step (ST140) according to the present invention uses electrical energy, it is carried out in an inert gas atmosphere. 11 is a cross-sectional view showing a part of the apparatus for forming the molten portion 23 at the end of the coil piece 40, the reference numeral 210 is an electrode, 220 is an insulator, 221 is an inert gas supply passage, 230 is A gap formed between the electrode 210 and the insulator 220 and communicating with the supply passage 221 is illustrated. As shown in FIG. 11, the coil piece 40 is connected to the negative electrode of the power supply part, the electrode 210 is connected to the positive electrode of the power supply part, and the coil piece 40 and the electrode 210 are connected to each other. The space | interval t2 is formed in between, and an inert gas is supplied around the coil piece 40 and the electrode 210, and the melting part 23 is formed. The inert gas supplied around the coil piece 40 and the electrode 210 serves to block the coil piece 40 from the surrounding air.

Example

The filament was manufactured by cutting and forming a melted portion by applying the filament manufacturing method according to the present invention for the range most used as the electrode filament. The diameter of the tungsten wire ranges from 0.01 to 0.05 mm, the diameter of the primary mandrel ranges from 0.075 to 0.13 mm, the diameter of the secondary mandrel ranges from 0.4 to 1.0 mm, the outer diameter of the primary coil ranges from 0.15 to 0.25 mm, and the secondary The outer diameter of the coiled coil body is in the range of 0.9 to 1.3 mm, the spacing between the coils of the primary coil (PG1 in Fig. 5) is 2.5 to 4.5 times the diameter of the tungsten wire, and the spacing between the coils of the secondary coil (Fig. 5). In the case where PG2) was in the range of 1.1 to 2.2 times the diameter of the primary coil, cutting and melting part formation experiments were performed.

As described above, the inclination angle θ1 of the upper slope portion 121 and the inclination angle θ2 of the lower slope portion 131 are formed in an angle range of 10 to 15 ° with respect to the vertical line, and the fixed cutter 120 and the movable cutter are When the 130 is cut, the lower surface of the fixed cutter 120 and the upper surface of the movable cutter 130 are in contact with each other so that a defect such as burr does not occur on the cut surface, and the cutters 120 and 130 are disposed on the coil body 30. No deformation caused by The inclination angles θ1 and θ2 are preferably 12 ° in the above to prevent the occurrence of defects.

In the formation of the molten portion 23, the gap between the coil piece 40 and the electrode 210 is in the range of 1.0 to 1.5 mm, and the potential difference between the electrode 210 and the coil piece 40 is maintained in the range of 25 to 35 kV. The molten part was molded while injecting argon (Ar) gas in the longitudinal direction around the electrode 210 and the coil piece 40. When the current is smaller than 25 amperes (A), the molten part 23 is formed. It was not molded, and if it exceeded 40 amperes, the formation rate of the molten portion grew too fast to form a molten portion of the desired size. On the other hand, when the current is applied at 25 to 40 amperes, when the current application time is within the range of 24 to 40 mA (milliseconds), the maximum diameter of the melting part 23 is in the range of 100 to 110% of the outer diameter of the coil body 30. Was formed. Therefore, both ends of the filament are protected by the melting part 23 so that the end portion is not damaged during transportation or installation, and there is no fear of being entangled with other filaments by the end portion. In the above, when the potential difference between the electrode 210 and the coil piece 40 is less than 25 kW, the forming speed of the melted portion 23 is remarkably lowered. It was quite difficult to form the melted portion 23 in size.

In the above, the injection amount of argon gas is preferably in the range of 20.0 to 50.0 L per hour. When the injection amount of argon gas is 20.0 L or less per hour, the melting part 23 was not formed even if the above voltage, electric current, and electric current application time were maintained. And when it is set to 50.0 L or more, the growth rate of the molten portion 23 is too fast to control the size of the molten portion 23 by adjusting the voltage, current and current application time.

The molten part 23 is formed under the above conditions, and after the argon gas is continuously sprayed to maintain the molten part 23 protected by the argon gas, the molten part solidified at both ends by exposing to the atmosphere ( The filament preparation having 23) was completed. After the molten portion 23 was formed, the time protected by the argon gas was sufficient in the range of 0.5 to 1.0 seconds, which was maintained at about 0.6 seconds in this embodiment.

In the above, the primary mandrel and the secondary mandrel may be made of iron or molybdenum, and in the case of iron, it is preferable to use pure iron. When carbon is contained in the iron core mandrel, the molten portion was not formed by heating together with the tungsten wire under the above conditions.

After forming the fusion portion 23 under the same conditions as above, the primary mandrel and the secondary mandrel are removed by corrosion with acid or the like. A part of both ends of the primary and secondary mandrel is formed by the melting part 23 together with the tungsten wire, and the part which is not formed by the melting part 23 is melted and removed by acid or the like.

While the invention has been shown and described in connection with specific embodiments thereof, it is conventional in the art that various changes, modifications and variations are possible without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone who knows the knowledge of is easy to know.

According to the electrode filament manufacturing method according to the present invention as described above it is possible to easily control the size of the melted portion 23 provided on both ends of the filament can be easily formed according to the design dimensions to generate the melted portion 23 There is no fear of failure due to this, and it is possible to prevent the waste of raw materials consumed by being melted in the melter 23, and to form the melter 23 in a short time, while the longitudinal width of the melter 23 Since it can be made small, there is an effect that it is possible to minimize the loss of material required for the melted portion (23).

Claims (6)

In the method of manufacturing the electrode filament 20 which consists of the coil part 21 formed by a spiral and the melting part 23 formed by the both ends of the said coil part 21, the tungsten wire around a 1st mandrel A primary coiling step (ST110) of winding a spiral to generate a primary coil; A secondary coiling step (ST120) of winding the primary coil spirally around the second mandrel to form a coil body 30; A cutting step (ST130) of cutting the coil body 30 generated in the secondary coiling step to generate the coil piece 40; A melting part forming step (ST140) of forming a melting part 23 at both ends of the coil piece 40; Removing the first mandrel and the second mandrel (ST150) comprising the filament manufacturing method for an electrode characterized in that it comprises a. According to claim 1, The cutting step (ST130) is the upper body portion 110 is formed with a guide hole 111, the lower body portion is provided spaced downward from the upper body portion 110, the through-hole 141 is formed Inserting the coil body 30 into the guide hole 111 and the through hole 141 of the 140; It is installed between the upper body portion 110 and the lower body portion 140 to the lower portion of the upper body portion 110, the upper recess 123 is formed and the moving cutter 130 around the upper recess 123 Supporting one side with a fixed cutter 120 having an inclined upper inclined portion 121 so as to increase the thickness away from; Located in the upper portion of the lower body portion 140 between the upper body portion 110 and the lower body portion 140, the lower concave portion 133 is formed, the thickness increases away from the fixed cutter 120 Advancing the moving cutter 130 having a lower inclined portion 131 inclined to the fixed cutter 120; Method for producing a filament for the electrode, characterized in that the shear cut between the upper recess 123 and the lower recess 133. The method of claim 1, wherein the forming of the molten part (ST140) is such that the end of the coil piece 40 cut in the cutting step (ST130) and one end of the electrode 210 has a distance (t2) to each other, Connect 210 to the positive electrode of the power supply section, connect the coil piece 40 to the negative electrode of the power supply section, respectively, and supply the inert gas around the coil piece 40 and the electrode 210. The filament manufacturing method for an electrode characterized by supplying and forming the melting part 23. The method of claim 1, wherein the first mandrel and the second mandrel are pure iron. The tungsten wire diameter of the filament is in the range of 0.01 to 0.05 mm, the spacing t2 formed between the coil piece 40 and the electrode 210 is in the range of 1.0 to 2.0 mm. A potential difference between the piece (40) and the electrode (210) is maintained in the range of 25 to 35 kA, and the current is supplied in the range of 25 to 40 A to form the molten portion (23). 4. The argon gas according to claim 3, wherein the inert gas is argon (Ar), and the argon gas supplied around the coil piece 40 and the electrode 210 when the outer diameter of the coil piece 40 is in the range of 0.9 to 1.3 mm. The amount of the filament manufacturing method for an electrode, characterized in that the range of 20.0 ~ 50.0L per hour.

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