JP2001223060A - Manufacturing method of contact terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of contact terminal, regardless of its size, removing the strain caused by internal stress generated at the stage of manufacturing as much as possible, and obtain the contact terminal with good quality. SOLUTION: A means of forming 2 forming a thin metal strip B into spread- shape, a means of cutting 4 cutting the formed thin metal stripe, and a means of bending and forming 2, bending the cut off terminal plate B1 into roll-shape, are installed for the manufacturing method of contact terminal which includes the process of removing the residual stress in a half-finished terminals B2 by storing them in a means of heat treatment 6 for prescribed period, after forming a roll-shaped half-finished terminal B2, while conveying the thin metal strip B. While firming at the means of forming 2, a tension adding means D adds tension to the thin metal strip B by setting the temperature of atmosphere at the means of forming 2 lower than that at the means of heat treatment 6 but higher than the room temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method for manufacturing a contact terminal formed on a contact terminal in the form of a screw.

[0002]

2. Description of the Related Art In general, a contact terminal on the side of an insertion port such as an outlet, a jack, a connector, or the like that enables electrical connection by inserting a plug has a pair of terminal ends opposite to each other across the insertion axis. There is often used a configuration provided so as to protrude into an insertion path so that an inserted plug is sandwiched by an elastic force to come into contact with a plug-side contact terminal provided around a plug body.

However, in such a contact terminal structure,
There are problems as described below. In other words, the surface of the contact terminal is plated with gold, silver, etc. to reduce the electric resistance so that the conductive state can be satisfactorily performed. Depending on use under adverse conditions such as use in a place where temperature changes are severe, an oxide film or corrosion may occur on the contact terminal due to chemical change due to oxidation or battery action. In such a case, in the case of such a contact terminal structure, when a large current is applied, there are few contact points between the terminals. There is a concern that the characteristics may change.

For this reason, automobiles, hybrid vehicles,
In a contact terminal used for electric connection such as a power supply system wiring path and an electric distribution path of an electric vehicle or the like, a number of terminal tips are provided on an inner peripheral surface of a plug insertion path so as to protrude in a circumferential direction, A plug configured to hold the inserted plug with elastic force and come into contact with a number of contact points with plug-side contact terminals provided around the plug body is used, as described above. Even when a large current is applied, a good energized state without affecting the material properties of the contact terminals is obtained because of the large contact portions between the contact terminals.

Normally, a contact terminal used in an electric system of an automobile or the like of this kind is formed by punching a large number of slits in a long metal plate having a spring property along a longitudinal direction at a central portion of the plate width. Then, a concave portion continuous in the longitudinal direction at the center portion of the plate width is formed into a preformed material by a curved forming means, and the preformed material is cut into a predetermined length in the longitudinal direction, and the cut preformed material is removed. It is manufactured by being wound into a roll by a roll forming apparatus.

[0006]

However, the roll-shaped contact terminal manufactured as described above is formed by processing a metal sheet having spring properties and rolling the same, so that a normal metal sheet is used. The strain of internal stress due to processing is larger than that of
Deformation such as bending or crimping is likely to occur in the finally finished contact terminal, and there is a problem to be solved in terms of quality.

For example, in the case of a relatively small size having a diameter of 10 mm or less, the quality can be maintained by such a manufacturing method. Since the distortion due to the internal stress is large, the shape of the product is not stabilized, and a phenomenon such as shape collapse occurs, and the yield in quality is poor, and there is a problem that the quality cannot be standardized and standardized.

The present invention has been made in view of the above-mentioned situation, and its main problem is to suppress as much as possible the strain of internal stress caused by processing, regardless of the size of the size, and to achieve good quality. Another object of the present invention is to provide a method for manufacturing a contact terminal that can obtain a proper contact terminal.

[0009]

According to a first aspect of the present invention, there is provided a method for manufacturing a contact terminal, comprising the steps of: connecting a strip-shaped metal sheet to a transport path for transporting the strip-shaped metal sheet having a spring property; Forming means for forming into a shape corresponding to the shape, cutting means for cutting the formed strip-shaped sheet metal in terminal length units, and bending forming means for bending the cut terminal plate into a roll having a predetermined diameter. After rolling the semi-finished product terminal while transporting the strip-shaped metal sheet, the semi-finished product terminal is stored for a predetermined time by a heat treatment means to remove residual stress of the semi-finished product terminal. A method of manufacturing a contact terminal, wherein the atmosphere temperature at least in the forming part of the forming means,
The temperature is set lower than the heat treatment temperature of the heat treatment means and higher than the normal temperature, and the tension is applied to the strip-shaped metal sheet by the tension applying means during the forming by the forming means.

[0010] According to the above-mentioned characteristic configuration, tension is applied to the strip-shaped metal sheet so that the material itself is distorted, and the strip-shaped metal sheet in a less strained state is formed via the forming means in a set temperature atmosphere. The rolled semi-finished terminal can be formed into a shape corresponding to the developed shape of the terminal with little distortion, and the rolled semi-finished terminal formed by cutting the thin metal plate with low distortion through cutting means and bending means. By storing by a heat treatment means having a temperature higher than the ambient temperature for a predetermined time, the residual stress in the semi-finished terminal is removed, and a contact terminal without distortion can be manufactured.

Further, since the same result can be obtained regardless of the size of the contact terminal to be manufactured, a contact terminal having no distortion can be manufactured in manufacturing a contact terminal of any size. As a result, the production quality can be significantly improved, for example, the production yield is improved.

A feature of the method for manufacturing a contact terminal according to a second aspect of the present invention is as follows. When the atmosphere temperature at least in the bent portion of the means is H3 and the heat treatment temperature of the heat treatment means is H4, the relationship is (H4, H3) ≧ (H2, H1).

According to the above feature, the ambient temperature in the post-molding stage in which the semi-finished terminal is molded is higher than the ambient temperature in the molding stage in which the contact terminal reaches the semi-finished terminal. Strain is removed, and a contact terminal of stable quality can be reliably manufactured.

According to a third aspect of the present invention, there is provided a method for manufacturing a contact terminal, wherein the molding means includes a punching means for forming a large number of slits at least in a central portion of the plate along the conveying direction; And a contact piece forming means for forming a concave portion or a convex portion continuous in the transport direction.

According to the above feature, a large number of slits are formed along the circumferential direction of the central portion of the plate width, and the remaining plate portion between the adjacent slits is concave or convex. The developed shape having the structure can be continuously formed on the strip-shaped metal sheet along the transport direction.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a contact terminal, wherein the tension applying means comprises a pair of holding rollers for holding a belt-shaped sheet metal conveyed along a conveying path from both sides. Along with being arranged at least at two locations of the upper side of the punching means and the lower side of the transfer,
The point is that the feeding force of the holding roller on the upper side of the conveyance is smaller than the feeding force of the holding roller on the lower side of the conveyance.

According to the above-mentioned characteristic configuration, a tension along the conveyance path can be applied to the band-shaped metal sheet between the holding roller on the upper side of the conveyance and the holding roller on the lower side of the conveyance. In addition, the distortion of the internal stress of the transported metal sheet itself can be removed.

A feature of the method for manufacturing a contact terminal according to claim 5 of the present invention is that a longitudinal direction of a terminal plate to be cut is a rolling direction of a strip-shaped thin metal plate.

According to the above-mentioned characteristic configuration, the manufactured contact terminal has advantages of good mechanical properties and durability and a long product life. As a reason, when the longitudinal direction of the terminal plate to be cut is a direction orthogonal to the rolling direction of the strip-shaped metal sheet,
This is because it has been empirically found that the manufactured contact terminals have generally poor mechanical characteristics and durability even with the same physical characteristics, and have a short product life. Physical properties here refer to melting point, density, coefficient of linear expansion, thermal conductivity, conductivity, specific heat, etc. Mechanical properties refer to tensile strength, proof stress, elongation, Vickers hardness, and spring limit. Value, fatigue strength, etc.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An example in which the first embodiment is applied to the manufacture of a high current contact terminal will be described. FIG. 1 shows an apparatus A for manufacturing a high current contact terminal to which the present invention is applied, in which a pre-heating furnace 1 and a post-heating furnace 3 are provided along a transport path X of a metal sheet B having a band-like spring property. The former heating furnace 1 accommodates forming means 2 for forming the strip-shaped metal sheet B into a shape corresponding to the developed shape of the terminal, and the latter heating furnace 3 holds the strip-shaped metal sheet B formed by the forming means 2. Cutting means 4 for cutting in terminal length units;
Bending means 5 for bending 1 into a roll having a predetermined diameter.
And a heat treatment means 6 for storing the rolled semi-finished terminal B2 for a predetermined time by the bending means 5.

The strip-shaped metal sheet B conveyed to the conveying path X is made of a springy terminal material such as beryllium steel or phosphor bronze which is well used as a contact terminal material. I have.

For example, the preheating furnace 1 has a structure in which an electric heater 1A is used as a heat source and the inside is filled with an atmosphere gas 1B such as nitrogen gas and hydrogen gas to heat the inside of the room. A configuration in which the interior of the room is heated by filling an active gas, or a heating gas heated in the heating unit is supplied to the room, and a waste heat gas discharged from the room is heated in the heating unit, and the heated gas heated again is heated in the room. A configuration in which the room is heated by continuous heating such as supplying the air to the room is adopted.

The temperature of the preheating furnace 1 is controlled by, for example, turning on / off an electric heater or adjusting the inflow / outflow of a sealed gas according to the temperature detected by a temperature sensor disposed on the chamber wall. Is performed.

Forming means 2 provided in the former heating furnace 1
Is, for example, two sets (one set or two or more sets) of the front-stage clamping rollers 18 and 19 in order from the lower side to the upper side along the transport path of the metal sheet B, and the sheet width. Punching means 2 for forming a large number of slits in the center along the conveying direction
0, a contact piece forming means 21 for forming a continuous convex portion along the conveying direction at the center of the sheet width of the metal sheet B formed by the punching means 20, and a metal formed by the contact piece forming means 21. Emboss forming means 22 for forming dowels at equal intervals of the thin plate B is provided.

The front clamping rollers 18, 19 are constituted by arranging a pair of clamping rollers 18A, 18B, 19A, 19B for clamping the strip-shaped sheet metal conveyed along the conveying path from the front and back. I have.

Pre-stage clamping rollers 18, 19, punching machine 2
As shown in FIGS. 1 and 2, the contact piece forming means 21 and the embossing biasing means 22 are a pair of upper and lower rolls for holding a strip-shaped sheet metal conveyed along a conveying path from both sides.
LA (18A, 18B), (19A, 19B), (20
A, 20B), (21A, 21B), (22A, 22
B), the lower clamping rollers 18A to 22A constitute fixed rollers rotatable at fixed positions, and each of the upper clamping rollers 18B to 22B includes a coil spring 7B.
0, it is configured to apply a pressing force to the lower holding roller side via an elastic force urging means such as an air cylinder.

Further, for example, each of the rollers 18A to 22A,
The drums 18B to 22B have the same maximum diameter, and the lower rollers 18A, 19A, 20A, 21A, 21A,
The endless chain 72 is wound between the sprockets 71 connected to the rotating shaft of 2A and the upper rollers 18B,
An endless chain 74 is wound between sprockets 73 connected to the rotating shafts of 19B, 20B, 21B, 22B, and rollers 22A, 22 above and below the emboss forming means 22.
B is engaged with gears 75 and 76 connected to the rotating shaft of B. An endless chain is connected to a passive sprocket 77 connected to a lower roller 22B of the emboss forming means 22 and a driving sprocket 79 of a driving motor 78. The band 80 is wound and the belt-like metal sheet B is pinched and conveyed from the lower side to the upper side by a power transmission mechanism in which the rotational force of the motor 78 is transmitted to the respective rollers via chains and gears. It is configured to be able to.

Therefore, by setting the holding rollers 22A and 22B of the emboss forming means 22 as driving rollers,
The rollers 18A to 21A and 18B to 21B of the front-stage clamping rollers 18, 19, the punching means 20, and the contact piece forming means 21 are driven rollers, and the feeding force by the clamping roller on the upper side of the conveyance is The feeding force is smaller than the feeding force of the holding roller on the lower side of the conveyance, and the tension applying means D is configured to always apply tension to the strip-shaped metal sheet B conveyed to the molding means 2. In addition, some of the high-current contact terminals have no warp.
It is not necessary to form a dowel on the strip-shaped thin metal sheet in the unfolded state by using the method described above, so that the emboss forming means 22 is not provided in the molding means 2 of the manufacturing apparatus for manufacturing a contact terminal having no dowel. Therefore, in such a manufacturing apparatus, the driving rollers are used as the holding rollers 21A and 21B of the contact piece forming means 21 so that the respective rollers of the front-stage holding rollers 18, 19 and the punching means 20 are provided. 18A to 20A and 18B to 20B are driven rollers, so that the feeding force of the holding roller on the upper side of the conveyance can be made smaller than the feeding force of the holding roller on the lower side of the conveyance. Tension applying means D is configured to constantly apply tension to the strip-shaped metal sheet B conveyed to the molding means 2.

Further, the holding roll of the contact piece forming means 21 is provided.
By setting the rollers 21A and 21B as driving rollers, the rollers 18 of the front-stage clamping rollers 18 and 19 and the punching means 20 can be used.
A to 21A and 18B to 20B are driven rollers, so that the feeding force by the holding roller on the upper side of the conveyance can be made smaller than the feeding force by the holding roller on the lower side of the conveyance. Tension applying means D for constantly applying tension to the strip-shaped metal sheet B conveyed to the molding means 2 may be configured.

In order to constitute the tension applying means D, in order to make the feeding force of the holding roller on the upper side of the transfer smaller than the feeding force of the holding roller on the lower side of the transfer, for example,
In addition to the method of the above-described embodiment, each of the holding rollers on the upper transport side and the lower transport side has a drive roller configuration in which the rotation is synchronized,
The gripping force of the gripping roller on the upper side of the transport is made stronger than the gripping force of the gripper roller on the lower side of the transport, and the gripping roller on the lower side of the transport is transported.
The feeding force by the roller may be smaller than the feeding force by the holding roller on the lower side of the conveyance.

As shown in FIG. 3, the punching means 20 is formed by arranging recessed female dies 20D at equal angles along the circumferential direction on the drum peripheral surface of the lower holding roller 20B. The male molds 20C projecting from the upper clamping roller 20A facing the lower clamping roller 20B are arranged at equal angles along the circumferential direction of the drum. -La 20
A, 20B, relative rotation of each pinching roller 20A, 2
The male mold 20C and the female mold 20D of the OB are configured to be able to form a shape corresponding to the developed shape of the terminal on the metal sheet B conveyed by being pinched and conveyed. The male mold 20
C and female type 20D differ depending on the type of terminal.
Specifically, as shown in FIG.
In the female mold 20D of B, a pair of female parts having a plurality of rectangular slits formed therein are formed at an interval, and a notch recess is formed at a predetermined position, and an upper part facing the female mold 20D is formed. The female mold 2 is attached to the male mold 20C of the clamping roller 20A.
A pair of male portions projecting a plurality of square slit shapes corresponding to 0D are formed at intervals, and a notch convex portion is formed at a predetermined position, so that upper and lower clamping rollers 20A,
By the relative rotation of 20B, each of the holding rollers 20A, 20B
The male mold 20C and the female mold 20D of FIG.
As shown in (a), a plurality of slits B
are formed in such a way that a pair of terminals a exist at intervals. In addition, in the female mold 20D of the lower clamping roller 20B, a plurality of rectangular slit-shaped recesses are formed in the circumferential surface of the drum along the circumferential direction, and the upper clamping roller facing the female mold 20D. The male mold 20C of the roller 20A has a plurality of rectangular slit-shaped protrusions formed along the circumferential direction on the drum peripheral surface, and each of the clamping rollers 20A and 20B is rotated by the relative rotation of the upper and lower clamping rollers 20A and 20B. La 20A, 20B male type 20C
As shown in FIG. 10 (a), a plurality of slits Ba are formed in the center of the width of the metal thin plate B to be held at equal intervals in the metal sheet B conveyed by being concavo-convex engaged with the female mold 20D. In some cases, shapes are formed.

As shown in FIG. 4, the contact piece forming means 21 forms a male mold 21D projecting over the drum peripheral surface of the lower holding roller 21B along the circumferential direction at a predetermined angle. A female mold 21C is formed at an equal angle, and is provided at a predetermined angle along the circumferential direction on the drum peripheral surface of the upper clamping roller 21A opposed to the lower clamping roller 21B. The female mold 21C of each of the holding rollers 21A and 21B is formed at an equal angle, and the upper and lower holding rollers 21A and 21B are rotated relative to each other.
And the male mold 21D are fitted in a concave and convex manner so that convex portions BA continuous in the transport direction can be formed at equal intervals at the center of the width of the metal sheet B to be nipped and transported. Due to the formation of the projections BA, as shown in FIG. 6B, the adjacent slits Ba, Ba formed by the punching means 20 are formed.
The remaining plate portion between them constitutes a convex contact piece Bb.

As shown in FIG. 5, for example, the emboss forming means 22 is a female die 22D which is recessed in a rectangular frame shape on the drum peripheral surface of the lower sandwiching roller 22B along the circumferential direction.
Are arranged at an equal angle, and a male die 22C protruding in a rectangular frame shape is formed along the circumferential direction on the drum peripheral surface of the upper clamping roller 22A opposed to the lower clamping roller 22B. They are arranged at an equal angle, and the relative rotation of the upper and lower holding rollers 22A, 22B causes the male mold 22 of each holding roller 22A, 22B to rotate.
As shown in FIG. 6 (c), the C and the female mold 22D are fitted to each other so as to form a concave or convex dowel Bc on the metal sheet B to be conveyed. .

The post-heating furnace 3 is configured, for example, to heat the inside of the furnace by filling the inside with nitrogen gas 3B using the electric heater 3A as a heat source, or to deaerate air in the furnace using the electric heater 3A as a heat source. A configuration in which a specific heating material is heated by applying a vacuum, or a mixture of nitrogen gas and hydrogen gas in order to prevent oxidation of the plate-shaped terminal B1 and to prevent discoloration by deaeration of air in the furnace using the electric heater 3A as a heat source. A configuration in which a gas is filled to heat the furnace, a configuration in which the inside of the furnace is heated by using an electric heater 3A as a heat source and an active gas is filled therein, or a heating gas heated by a heating unit is supplied to the furnace. At the same time, a configuration is adopted in which the inside of the furnace is heated by continuous heating such that the waste heat gas discharged from the furnace is heated by the heating unit, and the heated gas that is heated again is supplied into the furnace.

The temperature of the post-heating furnace 3 is controlled by, for example, turning on / off an electric heating heater or adjusting the inflow / outflow of a sealed gas according to the temperature detected by a temperature sensor provided on the chamber wall. Is performed.

As shown in FIG. 1, for example, the cutting means 4 comprises an upper movable cutting blade 42 for converting the rotational driving force of a motor 40 into a vertical movement via a crank mechanism 41, and a guide table 43. As shown in FIG. 6D, the strip-shaped metal sheet B guided by the guide table 43 and conveyed at a predetermined speed is cut into a predetermined length between the fixed blade 44 and the fixed blade 44 on the side. Terminal plate B1 corresponding to the developed shape of the terminal from a thin metal plate
Is formed. Here, although not shown, the cutting means 4 cuts a portion unnecessary for forming the terminal plate B1 corresponding to the developed shape of the terminal, in addition to cutting the strip-shaped metal sheet B at a predetermined length. Cutting means for shaping. The reason is that in the molding means 2, unnecessary portions may be cut in advance at the stage of molding corresponding to the developed shape of the terminal. This is because, in order to apply a well-balanced tension via D, cutting should not be performed so as to reduce the application of the tension, but it is determined that the cutting should be performed in a process after the tension effect has been exerted. Specifically, a notch or a cut that reduces the width of the band-shaped metal sheet B in a direction orthogonal to the transport direction corresponds to the notch.

As shown in FIGS. 2 and 7, the bending means 5 comprises a pair of upper and lower cored rollers 51 and 52 made of a metal material having high heat resistance. The core metal roller 52 has a large diameter and the upper core metal roller 51 has a small diameter, and the peripheral surface of the upper metal core roller 51 has a convex surface of the strip-shaped metal sheet B1 to be conveyed. A hemispherical concave portion 51A that does not interfere with the contact piece Bb is formed in a portion corresponding to the contact piece Bb portion, and a belt-like metal sheet to be conveyed is provided on the peripheral surface of the lower metal core roller 52. Concave dowel Bc of thin plate B1
A groove 52 which does not interfere with the dowel Bc is provided in a portion corresponding to the portion.
When the strip-shaped metal sheet B1 having a predetermined length and formed and transported is sandwiched between the upper and lower rollers 51 and 52, the strip-shaped metal sheet B1 is wound around the upper core metal roller 51 from the insertion end and rolled. −
As shown in FIGS. 7 and 8, the contact piece Bb is curved inward in an arc shape so that the contact piece portion has a drum-like shape, and the dowel Bc projects outwardly on the peripheral portion. Is formed to form a semi-finished terminal B2.

The upper core roller 51 is cantilevered. The upper core roller 51 is externally fitted to the core roller 51 and a cylinder 54 is attached thereto. A push plate 55 that reciprocates between the base end and the open distal end of the cored bar roller 51 is provided, and the semi-finished product terminal B2 wound around the upper cored bar roller 51 is pressed. As a result, the semi-finished product terminal B2 is discharged from the upper core roller 51. By the way, in the case of the terminal in the unfolded state described with reference to FIG. 9A, the terminal is processed through the emboss forming means 22, the cutting means 4, and the bending means 5, and as shown in FIG. Are curved inward in an arc shape to form a drum-shaped contact piece portion, and form a semi-finished terminal B2 in which a tongue-shaped dowel Bc that is formed by bending inward is formed on the periphery. In the case of the terminal in the unfolded state described with reference to FIG. 10A, the terminal is processed through the cutting means 4 and the bending means 5, and as shown in FIG. To form a semi-finished product terminal B2 without a dovetail.

The heat treatment means 6, as shown in FIG.
A container 60 for receiving and accommodating the semi-finished terminal B2 released from the bending means 5;
2 is full, the conveyor 61 is transported to the opening / closing opening 3C of the post-heating furnace 3 for a set time (for example, 2 hours to 3 hours).
It is composed of

The semi-finished terminal B2, which has been subjected to the heat treatment by the heat treatment means 6, is conveyed to the next step of plating, such as gold or silver.

[0041]

[Example] About 1 mm to 40 mm in diameter and 0.15 m in thickness
Experimental production of roll-shaped high current contact terminals of about m to 3 mm was performed.

As the spring-like strip-shaped metal sheet B, JIS
Beryllium copper such as C1720 or a terminal material similar thereto was used.

As a condition, the temperature of the pre-heating furnace is set to 200 to
The temperature is preferably set to about 230 ° C. at 250 ° C., and the strip-shaped metal sheet is formed into a shape corresponding to the developed shape of the terminal by the forming section of the forming means 2 in this temperature and ambient temperature H1. 330 ° C, preferably 320 ° C
And at this ambient temperature H2, H3, the cutting means 4 cuts the strip-shaped metal sheet B in terminal length units,
The terminal board B1 cut by the bending means 5 is inserted into a row of a predetermined diameter.
And bent by heat treatment means 6 to 310-3
The semi-finished product terminal B2 was stored at an ambient temperature H4 of 30 ° C., preferably about 320 ° C., for 1 hour to 3 hours, preferably about 2 hours 30 minutes.

[Experimental Result] A high current contact terminal free of internal stress and having no distortion was obtained. For contact terminals using beryllium copper or similar materials, HV430-
A Vickers hardness of 50 was obtained, high performance was obtained as a contact terminal, and it was possible to obtain a result having excellent durability.

[Comparative experiment] A diameter of about 1 mm to 40 mm,
The semi-finished terminal B2, which is a roll-shaped high current contact terminal having a thickness of about 0.15 mm to 3 mm, is subjected to heat treatment at an ambient temperature H4 of 260 ° C., 320 ° C., 370 ° C., and 420 ° C. An experiment was performed to investigate the relationship with storage time at different temperatures. 12 shows the results of the tensile strength test, FIG. 13 shows the proof stress, and FIG. 14 shows the test results of the elongation. In terms of results,
It was found that the highest peak value of tensile strength, proof stress, and elongation exhibited the maximum peak value at an atmosphere temperature H4 of 320 ° C. and the storage time was about 2 hours and 30 minutes.

The molding process of the molding means 4 is performed in the range of 200 to 2
The reason why the heat treatment was performed at an ambient temperature of 50 ° C. is that if the temperature is 200 ° C. or less, the strain removal by the molding process of the molding means 4 is not sufficient, and if the temperature is 250 ° C. or more, the strain removing effect is the same as the lower temperature. .

The bending process of the bending means 5 is performed by 310 to
The reason why the temperature is set at 330 ° C., preferably at about 320 ° C. is to optimally cope with the elimination of the distortion of the internal stress due to the roll bending. This is to facilitate temperature control.

The storage of the heat treatment means 6 is 310 to 330
When the temperature was lower than 310 ° C., the semi-finished product terminal B2 was rapidly softened, and the optimum hardness could not be secured. This is because a high hardness cannot be secured.

[Other Embodiments] 1) In the first embodiment described above, the contact piece forming means 21 forms a continuous projection along the transport direction at the center of the sheet width of the thin metal plate B, so that the plug is formed. Outlets, jacks, and connectors that allow electrical connection by inserting
Although the method of manufacturing the contact terminal on the insertion port side of the insertion port side has been described, the present invention is not limited to this. A method of manufacturing a plug-side contact terminal that can be plugged into an outlet, jack, connector, or the like to enable electrical connection by being formed may be used.

2) Molding means 2 in the above-mentioned embodiment.
The widths of the different widths can be changed by making each of the forming parts of the punching means 20, the contact piece forming means 21, the embossing forming means 22, and the cutting means 4 replaceable with the forming parts corresponding to the type of the contact terminal to be manufactured. It is possible to manufacture a strip-shaped metal thin plate, a contact terminal having a different slit shape, concave or convex shape, and dowel shape, and the like. The contact terminals having different diameters are manufactured by replacing the gold roller 52 with an upper core roller 51 and a lower core roller 52 corresponding to the type of the contact terminal. be able to.

3) In the above-described embodiment, an example in which the bending means 5 and the heat treatment means 6 are provided together in the post-heating furnace 3 has been described. However, the present invention is not limited to this. And the heat treatment means 6 may be separately heated. In this case, there is an advantage that each heating space can be reduced.

[Brief description of the drawings]

FIG. 1 is a principle explanatory view showing an overall configuration of the present invention.

FIG. 2 is a simplified perspective view showing a processing state of a metal sheet along the conveyance of the metal sheet.

FIG. 3 is a sectional view showing a main part of the punching means.

FIG. 4 is a sectional view showing a main part of a contact piece forming unit.

FIG. 5 is a cross-sectional view showing a main part of the embossing means.

FIG. 6 is an explanatory diagram showing a process in which a strip-shaped metal thin plate reaches a semi-finished product terminal.

FIG. 7 is a perspective view showing a state in which a semi-finished product terminal is wound around a cored roller on the upper side of the bending means.

FIG. 8 is a perspective view showing a state in which a semi-finished product terminal has been released from an upper metal core roller by pushing a pressing plate of a bending means.

FIG. 9 is an explanatory view showing each forming state of a strip-shaped metal sheet.

FIG. 10 is an explanatory view showing each forming state of a strip-shaped metal sheet.

FIG. 11 is a graph showing tensile strength.

FIG. 12 is a graph showing proof stress;

FIG. 13 is a graph showing elongation.

[Explanation of symbols]

 Reference Signs List A A contact terminal manufacturing apparatus B Metal sheet B1 Terminal plate B2 Semi-finished terminal D Tension applying means 2 Forming means 4 Cutting means 5 Bending forming means 6 Heat treatment means 20 Punching means 21 Contact piece forming means 20 Punching means 18A, 18B Rollers 18A to 21A for the lower side of the transport 18B to 21B Rollers for the lower side of the transport

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayuki Koshigoe 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Yazaki Parts Co., Ltd. EV Equipment Development Division (72) Inventor Shigeru Hazeyama 3 Mitsuyanaka, Yodogawa-ku, Osaka-shi, Osaka F-term (reference) in Chome No. 1-1 Domestic Spring Industry Co., Ltd. 5E063 GA03 GA09 GA10 XA02

Claims (5)

[Claims] 1. A shaping means for shaping a strip-shaped metal sheet into a shape corresponding to a developed shape of a terminal, a forming means for forming the strip-shaped metal sheet into a conveying path for conveying a strip-shaped metal sheet having spring properties, A cutting means for cutting in units and a bending means for bending the cut terminal plate into a roll having a predetermined diameter are provided, and a roll-shaped semi-finished terminal is transported while conveying the strip-shaped metal sheet. After manufacturing, the semi-finished terminal is stored in a heat treatment means for a predetermined time, a method of manufacturing a contact terminal for removing the residual stress of the semi-finished terminal, comprising: A contact terminal which is set at a temperature lower than the heat treatment temperature in the heat treatment means and higher than room temperature, and at the time of molding by the molding means, tension is applied to the strip-shaped metal sheet by the tension applying means. Manufacturing method. 2. An atmosphere temperature of at least a forming section of the forming means is H1, an atmosphere temperature of at least a cutting section of the cutting means is H2, an atmosphere temperature of at least a bending section of the bending means is H3, and a heat treatment means is provided. Heat treatment temperature of H
The method according to claim 1, wherein the relationship of (H4, H3) ≧ (H2, H1) is established when 4 is set. 3. The molding means forms at least a punching means for forming a large number of slits in the central part of the plate along the conveying direction, and a concave part or a convex part continuous in the central part of the plate along the conveying direction. 3. The method for manufacturing a contact terminal according to claim 1, comprising a contact piece forming means. 4. The tension applying means comprises a pair of holding rollers for holding a strip-shaped metal sheet conveyed along a conveying path from the front and back, at least at two positions on the upper and lower conveying sides of the punching means. Wherein the feeding force of the holding roller on the upper side of the transport is smaller than the feeding force of the holding roller on the lower side of the transport. 2. The method for producing a contact terminal according to claim 1. 5. The method for producing a contact terminal according to claim 1, wherein the longitudinal direction of the terminal plate to be cut is a rolling direction of the strip-shaped metal sheet.