JP2005238260A - Method for manufacturing grand bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce grand bars, which have no burrs in the width direction and the thickness direction and are free from a camber and strain, at high speed. <P>SOLUTION: A piece (grand bar) of a slender sheet is formed from a round metallic wire rod Wa by a process comprising: a rolling device 11 (rolling stage) in which a round metallic wire rod Wa is taken as a base stock and with which this base stock is successively rolled into a sheet-shaped strip Wd; an annealing device 12 (annealing stage) for removing the residual strain by working of the sheet-shaped strip Wd; and a cutting device 14 (cutting stage) for cutting the strip Wd into a prescribed length. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a ground bar, and more particularly, a method for producing a ground bar, comprising rolling a metal round wire into a thin plate-shaped strip as a raw material, cutting the thin strip into a thin and thin plate piece, and the like. It is about.

  In recent years, with the miniaturization of electronic devices such as personal computers, a large number of multi-core cables made of fine coaxial cables have been used. In connection connectors for multi-core cables, ground bars are used to reliably drop the outer conductor to ground and fix the center conductor at a predetermined pitch for each cable. Specifically, the ground bar includes a copper alloy center conductor, a resin insulation coating film covering the center conductor, and a tin-plated copper alloy lateral conductor shield covering the insulation coating film. In a multi-core cable formed by arranging ultra-fine coaxial cores with a jacket wrapped with polyester tape in parallel at a predetermined pitch, a part of the outer sheath of the coaxial core is removed and the exposed external conductor is sandwiched from above and below. The outer conductor is securely dropped to the ground. Because it is used in this way, if there are protruding parts such as burrs in the thickness direction of the ground bar, when the outer conductor is sandwiched, the protruding part breaks the insulation coating film and reaches the center conductor, causing a conduction failure Become. Further, if the ground bar is warped or distorted, it may cause contact failure.

  Conventionally, a method of forming a ground bar by cutting an ultra-thin plate made of metal into elongated thin plate pieces, a method of mechanically cutting the ultra-thin plate using a slitter, or a chemical cutting using an etching cutting method And a method of cutting with a light beam using a laser or an electron beam. However, the method of mechanically cutting using a slitter has a problem that stress is applied at the time of cutting and the ultrathin plate is deformed, warping or distortion occurs, and burrs are generated on the cut surface. In addition, the method of chemically cutting using the etching cutting method does not cause warping or distortion, but there are various processes such as cleaning, resist patterning processing, etching processing, resist peeling, cleaning, cutting, and cutting efficiency. There is a problem that it is bad, and there is also a problem that the facilities become large. The method of cutting with a light beam using a laser or an electron beam has a problem that a thermally deteriorated layer is formed at the cut portion.

  As a remedy for these problems, there is a technique disclosed in Japanese Patent Application Laid-Open No. 11-6082, which is a technique for producing a narrow ultrathin copper strip with respect to a method for cutting an ultrathin copper strip. As shown in FIG. 7, this technique continuously or intermittently contacts corrosion resistant wires 109 and 109 coated with a chemical that dissolves the wide ultrathin copper strip 110 along the cutting line of the wide ultrathin copper strip 110. And a method for cutting an ultrathin copper strip characterized by melting and cutting along a cutting line. According to this cutting method, the wide ultra-thin copper strip 110 is chemically melted and cut, so that the narrow ultra-thin copper strip obtained by the cutting has mechanical defects such as residual strain, deformation and warpage. In addition, the cutting operation can be performed quickly and accurately, and there is an effect that it is industrially useful.

This ultra-thin copper strip cutting method eliminates the need for cleaning, resist patterning, and resist stripping, so that the cutting operation can be performed quickly. Since the corrosion-resistant wire rods 9 and 9 coated with chemicals are contacted continuously or intermittently, and dissolution, cutting, and cleaning are repeated, there is a problem that a melting and cleaning process and equipment for that are necessary, and chemicals are used. Since it is cutting by corrosion, there is a limit to shortening the chemical reaction time required for cutting, and there is a problem that productivity is limited.
JP 11-6082 A (paragraph numbers [0013] to [0033])

  The problem to be solved by the present invention is that the method of mechanical cutting causes warping and distortion, and the problem that burrs are generated on the cut surface, and the method of chemical cutting using the etching cutting method However, there is a limit to shortening the chemical reaction time required for cutting because there is a problem that a process of dissolution and cleaning is necessary, and equipment for that is required, and it is cutting by corrosion using chemicals, The problem is that productivity is limited.

  The present invention described in claim 1 is a rolling process in which a metal round wire is used as a raw material, and the raw material is rolled into a thin plate-shaped strip, an annealing process for removing work distortion of the strip, and the strip. It is a manufacturing method of a ground bar characterized by comprising a cutting step of cutting to a predetermined length, and forming a thin thin plate piece of a set size from the metal round wire.

  According to a second aspect of the present invention, in the first aspect of the present invention, the gland is characterized in that, after the cutting step, a plating step for plating the elongated thin plate piece is provided. It is a manufacturing method of a bar.

  The present invention described in claim 3 is the method of manufacturing a ground bar characterized in that, in the present invention described in claim 1, the metal round wire is plated.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the ground bar is characterized in that a plating step for performing a plating process on the strip is provided after the annealing step. It is a manufacturing method.

  Since the ground bar manufacturing method according to the first aspect of the present invention uses a metal round wire as a raw material and is rolled into a thin strip in the rolling process, no flash in the width direction and thickness direction occurs. There is an advantage. In addition, since an annealing step is provided after rolling to remove the processing distortion due to rolling, there is an advantage that internal stress is removed and generation of warpage and distortion can be prevented. In addition, since the thin plate-shaped strip is only cut in the longitudinal direction, there is an advantage that high-speed cutting is possible. As a result, a ground bar free from warpage and distortion in the width direction and thickness direction can be produced at high speed.

  Since the manufacturing method of the ground bar of this invention of Claim 2 provided the plating process which plate-processes to the said elongate thin plate piece, it can manufacture the ground bar which improved rust prevention and electroconductivity.

  The method for producing a ground bar according to the third aspect of the present invention is such that a thin and thin plate piece is formed from a metal round wire that has been subjected to plating treatment, so that it is not necessary to newly provide a plating step, and production efficiency is improved. At the same time, poor plating can be prevented.

  Since the ground bar manufacturing method of the present invention according to claim 4 is provided with a plating step for plating the strip after the annealing step, the production efficiency is improved and at the same time, the plating failure is prevented. Can do.

  In order to produce a ground bar without warping and distortion at high speeds without burr in the width direction and thickness direction, a metal round wire is processed into a strip-shaped strip by rolling, and then it is cut at high speed into a predetermined length. It was realized by doing.

    FIG. 1 is a schematic diagram showing a rolling process in which a metal round wire is used as a raw material and the raw material is rolled into a thin strip, and an annealing process in which processing distortion of the strip is removed. FIG. 2 is a schematic diagram showing a cutting process for cutting the strip into a predetermined length. FIG. 3 is a cross-sectional view of each of the processes in which the material is rolled from a round wire material to a thin strip material. FIG. 4 is a perspective view showing a typical example of the elongated thin plate piece (ground bar) after cutting.

  The first embodiment will be described below with reference to FIGS. In FIG. 1, reference numeral 10 denotes a reel around which a metal round wire Wa made of phosphor bronze, which is a material of a ground bar, is wound, and is placed on a feeding device (not shown). On the right side of the reel shown in the drawing, the metal round wire Wa is stretched long and thin in the longitudinal direction and the width direction by continuously pressing between two rotating rollers (rolling step). A device 11 is provided. The rolling device 11 includes rolling rollers 11A, 11B, and 11C that are processed from a metal round wire Wa to a thin strip. The rolling rollers 11A, 11B, and 11C are rotationally driven by a driving unit (not shown) in a state where a pair of upper and lower rolling rollers are opposed to each other and pressed against each other by a biasing unit (not shown). The metal round wire Wa is pressed between a pair of upper and lower rolling rollers and passes while being rolled by the rotation of the rolling rollers 11A, 11B, and 11C. The number of rolling rollers can be increased or decreased as necessary, and the rolling may be either warm processing or cold processing.

  An annealing device 12 is installed on the right side of the rolling device 11 in the drawing, and is an annealing process for annealing the rolled strip-like strip material Wd. The thin strip-shaped strip Wd passes through the annealing device 12 while being heated to a set temperature, so that processing strain generated by rolling is removed, and internal stress is stabilized and processed to be free of strain. . Further, on the right side of the figure, there is provided a winding device (not shown) for winding the annealed thin plate-like strip material We onto the reel 13.

  In the rolling device 11 and the annealing device 12 configured as described above, the phosphor bronze metal round wire Wa wound on the reel 10 is supplied by the rotation of the rolling rollers 11A, 11B, and 11C in the rolling device 11, It passes between a pair of upper and lower rolling rollers while being pressed, and the cross-sectional shape gradually changes from a metal round wire Wa to a flat strip as shown in FIGS. 3 (a), 3 (b) and 3 (c). It is rolled into Wb and Wc, and finally becomes a thin strip Wd having a set dimension (thickness t × width B) as shown in FIG. Both ends in the width direction of the strip Wd are rounded and smooth. Although the cross-sectional shape of the thin plate is changed depending on the application, for example, the thickness t is processed from 0.08 mm to 0.5 mm, and the width B is processed from 0.5 mm to 2.0 mm. At this time, if necessary, a roller for regulating the width direction may be appropriately provided between the rolling rollers, and the dimension in the width direction may be adjusted. In this way, the thin plate-like strip Wd having the cross-section formed into the final set dimensions is continuously sent to the annealing device 12, passes through the furnace and is annealed, processing distortion due to rolling is removed, and the internal It becomes a thin plate-like strip material We having no stress. The thin strip-shaped strip material We coming out of the annealing device 12 is wound around the reel 13 by a winding device. At this time, post-treatment such as distortion correction and pickling is performed as necessary.

  In FIG. 2, 13 is a reel around which an annealed thin plate-like strip material We is wound, and is placed on a feeding device (not shown). A cutting device 14 is installed on the right side of the reel 13 in the figure. A straightener 15 in which a plurality of straightening rollers 15 a are arranged in a staggered manner is attached to the supply port of the thin strip-shaped strip material We on the left side of the cutting device 14. On the right side, a pair of delivery rollers 16 and 16 are rotatably attached by a driving means (not shown) in a state where they are pressed against each other by an urging means (not shown). Further, a cutting tool 17 constituted by a pair of cutting tools 17A and 17B is provided on the right side thereof. The cutting tools 17A and 17B are provided so as to face each other. One cutting tool 17A has a cutting edge 17a formed at the tip, is attached to be movable back and forth, and is moved back and forth by a driving means (not shown). The other cutting tool 17B is provided with a guide hole along the moving line of the thin strip-shaped strip material We, and a cutting blade 17b is formed at one end of the guide hole. The cutting blade 17a is engaged with the cutting blade 17b of the cutting tool 17B that is fixedly attached by the back-and-forth movement of the cutting tool 17A, so that the thin plate material We can be cut.

In the cutting device 14 configured in this manner, the thin strip-shaped strip material We of the reel 13 placed on the feeding device is supplied with the rotation of the feed rollers 16 and 16 in the cutting device 14. Are passed between the plurality of straightening rollers 15a, 15a... And then intermittently sent out to the cutting process composed of a pair of cutting tools 17A, 17B by a predetermined length. When passing between the straightening rollers 15 a, 15 a..., The thin strip-shaped strip material We is subjected to repeated compression / tensile bending to remove distortion and wire wrinkles generated by being wound on the reel 13, and a straight state. become. The thin plate-shaped strip material We in a straight state is fed by a predetermined length between the cutting blades of the cutting tools 17A and 17B. The cutting tool 17A is advanced by driving means (not shown) at the timing of feeding, and the thin strip-shaped strip material We is cut into the set dimension length L by the engagement of the cutting blades 17a and 17b. Thickness t × width B × length L) is produced. The length of the elongated thin plate piece Wf is changed according to the application, but the length L is determined in accordance with the application in the range of 30 mm to 100 mm, for example. At this time, the operation is capable of cutting at high speed from the maximum 300 min ^-1 for only cut the feed of the thin plate-like strip We until 500 min ^-1. A representative example (thickness t0.1 × width B1.0 × length L50) of the elongated thin plate piece Wf (ground bar) after cutting is shown in FIG.

  The elongated thin plate piece Wf (ground bar) formed from the metal round wire Wa to a set size is subjected to cleaning and other pretreatments to improve rust prevention and conductivity, and then the horizontal rotary barrel plating apparatus shown in FIG. In 18, tin plating or nickel plating is performed. The barrel plating apparatus 18 includes a plating bath 18A and a hanging barrel 18B. The barrel 18B is rotatable about a horizontal axis. It is inserted through the inside. After the elongated thin plate piece Wf is put together with the dummy into the barrel 18B of a polygonal cylindrical body, the barrel 18B is immersed in the plating bath 18C and rotates around the rotation axis. By energizing, the elongated thin plate piece Wf is plated while being mixed with the dummy in the barrel 18B.

  In Example 1, the plating process is performed after the metal round wire rod is cut into the elongated thin plate piece Wf, but in Example 2, the metal round wire rod material for the ground bar is already in the stage. The plating process is performed. The second embodiment will be described with reference to FIGS. 1 and 2. Here, the components other than those common to the first embodiment are represented by (′) symbols. Reference numeral 10 'denotes a reel around which a metal round wire Wa' made of phosphor bronze is used as a material for the ground bar, and is placed on a feeding device (not shown). A rolling device 11 is provided on the right side of the reel 10 ′ as in the first embodiment. In this rolling apparatus 11, the metal round wire Wa ′ subjected to the plating treatment is rolled over several stages (rolling step), and the dimension (thickness t) in which the cross-sectional shape is set as shown in FIG. × Width B) is processed into a thin plate-like strip Wd ′. Next, the rolled thin plate-like strip Wd 'is sent to the annealing device 12 for annealing (annealing step). By this annealing, processing distortion due to rolling is removed, and a thin plate-like belt material We 'having no internal stress is obtained, and is wound around the reel 13' by a winding device (not shown). At this time, post-treatment such as distortion correction and pickling is performed as necessary.

  As shown in FIG. 2, the thin strip material We ′ wound on the reel 13 ′ is placed on a wire feeding device (not shown) of the cutting device 14, and is fed from the reel 13 ′ by a driving means (not shown). It is supplied to the cutting device 14. In the same manner as in the first embodiment, the thin strip material We ′ supplied from the reel 13 ′ in the cutting device 14 is moved between the plurality of straightening rollers 15a, 15a,. , And after being corrected to a straight state, it is intermittently sent out by a predetermined length to a cutting process composed of a pair of cutting tools 17A and 17B, and a thin and thin plate piece Wf ′ having a set dimension length L It is cut into (thickness t × width B × length L) (cutting step). A representative example of the elongated thin plate piece Wf ′ (ground bar) after cutting is shown in FIG. Since the plating process has already been performed at the material stage, the plating process after cutting is not necessary.

  In Example 1, the thin plate member Wf (ground bar) is subjected to a plating process after being cut, but in Example 3, after the annealing process, the thin plate-like strip material is subjected to a plating process. A plating process to be performed is provided. That is, as shown in FIG. 6, a plating apparatus 20 is installed after the annealing apparatus 12. The plating apparatus 20 is configured such that the thin strip-shaped strip material We sent from the annealing process passes through the plating bath over a predetermined time and is subjected to plating treatment.

  First, a metal round wire Wa is used as a raw material in the same manner as in Example 1, and rolling is performed by a rolling device 11 over several stages, and the cross-sectional shape is set to a dimension (thickness t × width B shown in FIG. 3D). ) In a thin plate-like strip Wd (rolling step). Next, annealing is performed on the thin strip Wd with the annealing device 12 (annealing step). The thin plate-like strip material Wd is annealed by passing through an annealing device, the processing distortion due to rolling is removed, and the thin strip-like strip material We has no internal stress. The annealed thin plate-like band material We is subjected to pretreatment for plating treatment such as distortion correction and washing as necessary. Next, it is sent to the plating apparatus 20 and is continuously subjected to a plating process such as tin plating or nickel plating (plating process). The thin plate-like strip material We 'that has been plated out of the plating apparatus 20 is subjected to post-treatment such as washing as necessary, and is wound around a reel 13' by a winding apparatus (not shown).

  As shown in FIG. 2, the thin strip material We ′ wound around the reel 13 ′ is placed on a wire feeding device (not shown) and fed out from the reel 13 ′ by a driving means (not shown) to the cutting device 14. Supplied. Hereinafter, in the same manner as in the first embodiment, the thin plate-like belt material We ′ supplied from the take-up reel 13 ′ in the cutting device 14 is rotated by the feed rollers 16 and 16, and a plurality of straightening rollers 15a and 15a. ... After passing through and straightened to a straight state, it is intermittently sent out by a predetermined length to a cutting process composed of a pair of cutting tools 17A and 17B, and an elongated thin plate piece having a set dimension length L Cut to Wf ′ (thickness t × width B × length L). A representative example of the elongated thin plate piece Wf '(ground bar) after being plated and cut is the same as that of the first embodiment and is shown in FIG.

  Thus, since the manufacturing method of the ground bar of Example 1 uses a metal round wire as a raw material and rolled it into a thin strip-shaped strip in the rolling process, it does not generate flash in the width direction and the thickness direction. In addition, since an annealing process is provided after rolling to remove the processing strain due to rolling, internal stress is removed and the occurrence of warpage and distortion can be prevented. Further, since the thin strip-shaped strip is only cut in the longitudinal direction, high-speed cutting is possible. As a result, there is an effect that a ground bar free from warpage and distortion in the width direction and thickness direction can be produced at high speed.

  In addition, since the ground bar is provided with a plating process for performing a plating process such as tin plating or nickel plating on the elongated thin plate piece, there is an effect that rust prevention and electrical conductivity can be improved.

  Since the manufacturing method of the ground bar of Example 2 was made to form an elongated thin plate piece from a metal round wire that has been plated, it is not necessary to newly provide a plating step and at the same time the production efficiency is improved. There is an effect that it is possible to prevent plating defects such as sticking of elongated thin plate pieces when plating is performed after the cutting step, or generation of burrs of plating.

  The manufacturing method of the ground bar of Example 3 provided the plating process for performing the plating process on the strip after the annealing process, so that the plating process can be continuously performed and the production efficiency is improved. There is an effect that it is possible to prevent plating defects such as sticking between elongated thin plate pieces when plating is performed after the process or plating burrs.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the scope of the invention. For example, in Example 1 above, the rolling process and the annealing process are continuous processes, and the subsequent cutting process is discontinuous. However, the rolling process, the annealing process, and the cutting process are continuously provided, and a metal round wire is provided. It is also possible to continuously process a thin strip piece through a thin strip as a raw material. And in this case, if the plating process is performed at the stage of the metal round wire material as in Example 2, it is possible to automatically and continuously produce from the material to the finished ground bar. Thus, productivity is remarkably improved. Moreover, also when performing a plating process after annealing like Example 3, a rolling process, an annealing process, a plating process, and a cutting process are provided continuously, and a metal strip is used as a raw material for a sheet-like strip material. The rolling process, the annealing process, the plating process, and the cutting are continuously performed, and it is also possible to automatically continuously process the thin and long thin plate pieces (ground bars). Even in this case, the productivity is remarkably improved.

The invention of the present application is not limited to the ground bar, but can also be applied to the manufacture of elongated thin plate pieces that cause problems when there are flashes in the width direction and the thickness direction.

It is a schematic diagram which shows the rolling process and annealing process in Example 1,2. It is a schematic diagram which shows the cutting process in Examples 1, 2, and 3. FIG. It is a cross-sectional shape figure of the process rolled in Example 1,2,3. It is a perspective view of the elongate thin board piece (ground bar) in Examples 1, 2, and 3. FIG. 1 is a schematic diagram showing a barrel plating apparatus in Example 1. FIG. It is a schematic diagram which shows the rolling process in Example 3, an annealing process, and a plating process. It is a schematic diagram which shows the cutting method of the ultra-thin copper strip of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reel 11 Rolling apparatus 12 Annealing apparatus 13 Reel 14 Cutting apparatus 15 Straightener 16 Feeding roller 17 Cutting tool 20 Plating apparatus

Claims (4)

  From a metal round wire as a raw material, a rolling process for rolling the raw material into a thin strip, an annealing process for removing processing distortion of the strip, and a cutting process for cutting the strip to a predetermined length A method for producing a ground bar, characterized in that an elongated thin plate piece having a set size is formed from the metal round wire.   The method for manufacturing a ground bar according to claim 1, further comprising a plating step of plating the elongated thin plate piece after the cutting step.   The method for manufacturing a ground bar according to claim 1, wherein the metal round wire is plated. The method for producing a ground bar according to claim 1, further comprising a plating step of plating the strip after the annealing step.

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