JPH0837051A - Pin type terminal and manufacture thereof - Google Patents

Abstract

PURPOSE:To manufacture a high-reliability pin terminal by fixing a pin to a terminal main body by welding, and increasing the mechanical and electrical binding force between the pin and the terminal main body. CONSTITUTION:Since the base end of a round pin 40 is coupled with the cylinder section 58 of a terminal main body 50 and welded and fixed to form a pin type terminal 30, the mechanical and electrical binding force between the round pin 40 and terminal main body 50 is increased. The round pin 4 is inserted to expand the cylinder section 58, the gap between the round pin 40 and cylinder section 58 is eliminated by the elastic shrinking force of the cylinder section 58, the adhesion is increased, and the mechanical and electrical binding force is further increased. At the time of assembling, a taper section 62 exists on the inlet side of the cylinder section 58, the end section 42 of the round pin 40 is made semi-spherical, and the round pin 40 can be easily inserted into the cylinder section 58. When the round pin 40 is held and positioned by the cylinder section 58 and welded with a laser, welding can be simply and stably applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin type terminal and a manufacturing method thereof.

[0002]

2. Description of the Related Art FIG. 9 is a side view showing a conventional pin type terminal 1 disclosed in Japanese Patent Laid-Open No. 2-28233. This pin-type terminal 1 has a pin 3 for fitting with a mating terminal.
And a terminal main body 5 for connecting to an electric wire are integrally connected.

The terminal body 5 is formed by sheet metal pressing, and has a pin crimping portion 5a at the tip, a core wire crimping portion 5b in the middle, and an insulating coating crimping portion 5c at the base end. In the molding step of the terminal body 3, all the caulking portions 5a, 5b, 5c are formed in a substantially U shape with the upper side open, and the pin 3 is inserted into the pin caulking portion 5a in the next processing step. The wire 7a of the electric wire 7 together with the pin 3 in the wire caulking portion 5b.
Is inserted and caulked, and the insulating coating 7b is inserted into the insulating coating caulking portion 5c and caulked.

10A, 10B, and 10C are shown in FIG.
The cross sections of A, B and C are shown respectively. In the core wire crimping portion 5b, the terminal main body 3, the pin 3 and the core wire 7a are joined by simultaneous crimping in a state in which the pin 3 is first inserted downward and the core wire 7a is placed thereon.

Further, the above publication describes the following as a method of manufacturing the pin type terminal 1.

In this manufacturing method, as shown in FIG.
First, in the first stage, the metal strip material is pressed to sequentially form the terminal body 5 having the pin crimping portion 5a, the core crimping portion 5b, and the insulating coating crimping portion 5c. Terminal body 5
Is molded in a form in which the carrier 4a and the cut pieces 4b are connected in a chain.

Next, the pin material 3a supplied from the reel
Through the feeder 11 and the cutting punch 9,
It is fed onto the pin crimping portion 5a and the core wire crimping portion 5b of one terminal body 5. After being sent, the pin material 3a is caulked and fixed by the pin caulking portion 5a, the pin material 3a is cut at a predetermined distance from the pin caulking portion 5a by the cutting punch 9, and the pin caulking portion 5a is crimped and held. Forming a pin 3.

Thereafter, the pin 3 is swaged and fixed to the series of terminal bodies 5, and when the swaging work is completed, the carrier 4a is put on the reel 13 together with the terminal body 5 and the pins 3 as shown in FIG. Roll up.

Next, in the second step, the carrier 4a is sent out from the reel 13 prepared in the first step, and the tip of the pin 3 is dipped in the plating solution 17a in the plating tank 17,
Only the tip portion of the pin 3 is plated, and the terminal body 5 holding the plated pin 3 is wound around another reel 15 together with the carrier 4a.

In the third stage, the terminal body 5 having the plated pins 3 is sent out onto the lower die 19a of the crimping die as shown in FIGS. 14 (A) and 14 (B). At the same time, the terminal-treated electric wire 7 is placed above the terminal body 5 located on the lower die 19a of the crimping die. At this time, the exposed core wire 7a
Is arranged on the core wire crimping portion 5b, and the insulating coating 7b is arranged on the insulating coating crimping portion 5c. Then, in this state, by lowering the crimping die upper die 19b with respect to the crimping die lower die 19a, the core wire crimping portion 5b is crimped to the end portion of the pin 3 and the core wire 7a, and the insulation coating crimping portion 5c is pressure-bonded to the insulating coating 7b, and at the same time, the terminal body 5 is cut at the cut pieces 4b to separate them one by one from the carrier 4a. This completes the connection to the electric wire 7.

[0011]

By the way, in the above-mentioned conventional pin type terminal 1, since the pin 3 and the terminal body 5 are joined by caulking, the mechanical and electrical coupling force cannot be increased so much. It was Therefore, the pin 3 is also crimped at the core crimping portion 5b, but since it is crimped together with the core wire 7a, a gap is likely to be formed around the pin 3 and a sufficiently high coupling force cannot be obtained. It was Further, there is a limit in improving the electrical performance because a gap is likely to be formed around the pin 3. Furthermore, since it is necessary to extend the pin 3 to the core crimping portion 5b, there is a problem that the weight increases.

In view of the above circumstances, it is an object of the present invention to provide a pin-type terminal and a method of manufacturing the pin-type terminal capable of increasing the mechanical and electrical coupling force between the pin and the terminal body and reducing the weight. .

[0013]

According to a first aspect of the present invention, in a pin type terminal comprising a terminal body having a wire crimping portion and a pin fixed to the tip thereof, a tubular portion is formed at the tip of the terminal body. The base end of the pin and the tubular portion are joined by welding in a state where the base end of the pin is inserted into the tubular portion.

The invention of claim 2 is the pin type terminal according to claim 1, wherein the pin is a round pin having a circular cross section,
It is characterized in that the cylindrical portion is a cylindrical portion having a circular cross section having a joint at one location in the circumferential direction and having a diameter in a free state smaller than the outer diameter of the round pin.

A third aspect of the present invention is the pin type terminal according to the second aspect, wherein the base end of the pin and the tubular portion are welded at the joint.

A fourth aspect of the present invention is the pin-type terminal according to any one of the first to third aspects, wherein a tapered portion that expands outward is provided at an end edge of the cylindrical portion on the pin insertion side. It is characterized by being provided.

A fifth aspect of the present invention is the pin type terminal according to any one of the first to fourth aspects, wherein the end of the pin on the side of insertion into the tubular portion is formed in a substantially hemispherical shape. And

According to a sixth aspect of the present invention, there is provided a method of manufacturing a pin type terminal comprising a terminal main body having a wire crimping portion and a pin fixed to the front end of the terminal main body. A tubular portion is formed in the base portion, the base end of the pin is inserted into the tubular portion, and in this state, the base portion and the base portion of the pin are laser-welded.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a pin-type terminal according to the sixth aspect, wherein a wire clamping portion is provided on a proximal end side and a cylindrical portion is provided on a distal end by press working with a progressive die. The terminal body having it is formed as a series of chains, the tip of the material of the pin supplied from the reel is inserted into the tubular portion of one of the terminal bodies, and the pin is placed at a position separated from the insertion position by a predetermined distance. Is cut, the pin material and the cylindrical portion are laser-welded, and the terminal body is separated from the chain.

The invention according to claim 8 is the method for manufacturing a pin-type terminal according to claim 7, characterized in that, when cutting the material of the pin, the cutting edge is formed into a substantially hemispherical shape. And

According to a ninth aspect of the present invention, there is provided a method of manufacturing a pin type terminal according to the sixth aspect, wherein a wire crimping portion is provided on a proximal end side and a tubular portion is provided on a distal end by press working with a progressive die. The terminal main body having the terminal main body is formed as a series of chains, and the base end of the pin cut into a predetermined length is inserted into one cylindrical portion of the terminal main body, and in that state, the base end of the pin and the cylinder are inserted. The parts are laser-welded to separate the terminal body from the chain.

According to a tenth aspect of the present invention, there is provided a method for manufacturing a pin-type terminal according to any of the sixth to ninth aspects, wherein the pin or the material of the pin is previously inserted into the tubular portion of the terminal body. It is characterized by being plated.

[0023]

According to the invention of claim 1, since the base end of the pin is welded while being inserted into the tubular portion of the terminal body, the pin and the terminal body can be compared with the case where the pin is fixed to the terminal body by caulking. The mechanical and electrical coupling strength of the. In particular, welding can be performed while holding the pin in the tubular part, so welding can be performed easily while positioning the pin stably.
Welding reliability is increased.

According to the second aspect of the invention, since the round pin is inserted into the cylindrical portion while the cylindrical portion is being expanded,
The elastic contraction force of the cylindrical portion reduces the clearance between the round pin and the cylindrical portion to improve the adhesion, and increases the holding force of the round pin, so that the round pin and the cylindrical portion can be welded in a more stable state. Further, unlike the square pin, since the round pin is a round pin, the round pin can be inserted in any direction without being aligned in the circumferential direction with respect to the cylindrical portion.

According to the third aspect of the present invention, since the welding is performed at the joint which is the free end of the tubular portion, the joining force is increased.

According to the invention of claim 4, since the tapered portion is on the inlet side of the tubular portion, the pin can be easily inserted.

According to the fifth aspect of the invention, since the end portion of the pin has a substantially hemispherical shape, the pin can be easily inserted.

According to the invention of claim 6, the terminal body and the pin can be firmly coupled by merely inserting the base end of the pin into the cylindrical portion formed in the terminal body and laser welding, thereby mechanically and electrically. It is possible to obtain a pin type terminal having a high coupling force. Therefore, it is not necessary to secure the fixing force using the two crimping pieces as in the case of the fixing by crimping, and the insertion length of the pin with respect to the terminal body can be shortened.

According to the invention of claim 7, the pin can be fixed to the terminal body while supplying the material of the pin with the reel.

According to the eighth aspect of the present invention, since the cut end is formed into a substantially hemispherical shape when the pin material is cut, the end of the pin material can be easily inserted into the tubular portion of the terminal body.

In the ninth aspect of the present invention, the pin previously cut into a predetermined length can be joined to the terminal body.

According to the tenth aspect of the present invention, since the pin or the pin material is plated in advance, it is not necessary to plate it later, and for example, the step of winding it around the reel at the terminal forming stage for plating is not required, and the manufacturing The process is simplified.

[0033]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded view of the pin type terminal 30 of the embodiment. The pin-type terminal 30 includes a round pin 40 fitted to a mating terminal and a sheet-metal-pressed terminal body 5.
It consists of 0. Both ends 42, 44 of the round pin 40 are rounded into a hemispherical shape.

FIG. 2 shows the structure of the terminal body 50. As shown in this figure, the terminal body 50 has a semi-circular cross section by curving both side edges of a strip-shaped substrate 52 upward.
An insulating coating crimping portion 54 and a core wire crimping portion 56 having a U-shaped cross section are formed on the base end side of 2, and a cylindrical portion 58 having a circular cross section is formed at the tip end portion.
Is formed.

The cylindrical portion 58 is formed by rolling extension pieces formed on both side edges of the substrate 52, and has a joint 60 directly above the substrate 52. The inner diameter d of the cylindrical portion 58 in the free state is slightly smaller than the outer diameter D of the round pin 40. Further, at the pin insertion side end edge of the cylindrical portion 58, a taper portion 62 that expands outward is formed.
Is provided.

As shown in FIG. 3, the pin type terminal 30 has the cylindrical portion 5 of the terminal body 50 as the first assembly stage.
Insert the base end of the round pin 40 into No.8, and as shown in FIG.
In the assembly stage, the base end of the round pin 40 and the cylindrical portion 58 are laser-welded at the position of the seam 60 in that state to be integrated. In FIG. 4, P is a welding point.

Laser welding is carried out by irradiating a laser beam focused on the welding point P with an appropriate output. As a result, the cylindrical portion 58 and the round pin 40 can be instantly melted and integrally coupled, and it is possible to prevent other portions from being affected by heat.

It is preferable that the number of welding points be at least one, and that the number be appropriately increased as the diameter of the round pin 40 increases.
It is desirable to set a plurality in the longitudinal direction of 0 to enhance the binding force. In this case, by welding the joint 60, both the cylindrical portion 58 and the round pin 40 can be directly irradiated with the laser beam, so that the welding can be performed easily and the deviation between the round pin 40 and the cylindrical portion 58 is surely prevented. Then, the binding force can be increased.

Thereafter, as shown in FIG. 5, in the third assembling step, only the core wire 7a of the electric wire 7 is singly used as the core wire tightening portion 56.
Then, the insulation coating 7b is integrated with the electric wire 7 by crimping the insulation coating 7b to the insulation coating crimping portion 54.

Thus, the pin type terminal 30 of the embodiment is
Since the base end of the round pin 40 is welded and fixed while being fitted to the cylindrical portion 58 of the terminal body 50, the round pin 40 and the round pin 40 are fixed as compared with the case where the round pin 40 is fixed to the terminal body 50 by caulking. The mechanical and electrical coupling force of the terminal body 50 is enhanced. In particular, since the round pin 40 is inserted in a state where the cylindrical portion 58 is expanded, the elastic contracting force of the cylindrical portion 58 eliminates the gap between the round pin 40 and the cylindrical portion 58, and the adhesion is improved, so that the mechanical strength is improved. And the electric coupling force is further strengthened.

Further, at the time of the above-mentioned assembly, since the tapered portion 62 is provided on the inlet side of the cylindrical portion 58 and the end portion 42 of the round pin 40 is hemispherical, the round pin 40 can be easily cylindrical. It can be inserted into the portion 58. At this time, since the round pin 40 is used instead of the square pin, positioning in the circumferential direction is completely unnecessary.

Further, since the laser welding can be performed in a state where the round pin 40 is held and positioned by the cylindrical portion 58, the welding can be performed easily and the welding can be stably performed. Even in that case, the cylindrical portion 58 firmly holds the round pin 40 by the elastic contraction force, so that the holding is sure and the welding can be performed accurately. In addition, when welding is performed at a plurality of points, the overall bonding strength can be increased even if each welding point is pinpoint welding.

Next, a manufacturing method suitable for mass-producing the pin type terminals 30 will be described.

As shown in FIG. 6, in this manufacturing method, a strip of copper alloy, which is a terminal material, is tin-plated and the like, and is pressed by a progressive die to form a wire crimping portion on the proximal end side. The terminal main body 50 having 54, 56 and the tubular portion 58 at the tip is formed as a series of chains. Each terminal body 50
Are connected in a chain by a carrier 4a and a cut piece 4b.

On the other hand, at the point where the terminal body 50 is formed and flows, the pin material 40 which has been previously plated with tin or the like.
a is arranged so that it can be sent out from the reel 46. Then, the tip end of the pin material 40a supplied from the reel 46 is inserted into the cylindrical portion 58 of one terminal body 50, and the pin material 40a is inserted at a position separated by a predetermined distance from the insertion position as shown in FIG. The pair of cutting blades 48a and 48b are used for cutting. At this time, the cutting edges 48 and 48 are formed in a spherical shape to cut the cutting ends 42 and 44 into hemispherical shapes.

Then, a laser beam 72 is emitted from a laser welding machine 70 from a direction orthogonal to the outer peripheral surface of the cylindrical portion 58 to laser-weld the pin 40 and the cylindrical portion 58. After the laser welding is completed, as shown in FIG.
The core wire 7a of the electric wire 7 and the insulating coating 7b are crimped to the 6 and the insulating coating crimping portion 54. At the same time, the terminal body 50 is cut at the cut piece 4b and separated from the carrier 4a to obtain the pin-type terminal 30 integrated with the electric wire 7.

According to this method, the terminal body 50 and the pin 40 can be firmly joined by simply inserting the base end of the pin 40 into the cylindrical portion 58 formed on the terminal body 50 and performing laser welding. And, a pin type terminal having a high electric coupling force can be easily obtained. Therefore, unlike the fixing by caulking, it is not necessary to secure the fixing force by using the two caulking portions, the insertion length of the pin 40 into the terminal body 50 can be shortened, and the weight can be reduced.

Further, since the pin 40 can be fixed to the terminal body 50 while supplying the pin material 40a from the reel 46, the pin material 40a can be easily handled. Further, particularly, when cutting the pin material 40a, the cutting blades 48a, 4
Since the cut ends 42, 44 are formed in a substantially hemispherical shape by 8b, it becomes easy to insert the pin material 40a into the cylindrical portion 58 of the terminal body 50, and it is not necessary to separately perform a step such as crushing the end portion. , The process is simplified. Also, the pin material 40a
Since it is plated in advance, there is no need to perform plating afterwards, and for example, the step of winding the reel around the terminal formation stage for plating is unnecessary.

When laser welding at a plurality of points,
As shown in FIG. 8, a plurality of laser welding machines 70 may be arranged so that the laser beam 72 can be emitted toward the welding location. In the example of FIG. 8, the laser welders are arranged above and below each other.

Further, instead of supplying the pin material 40 with the reel 46 as in the above embodiment, the pin 40 previously cut into a predetermined length may be inserted into the terminal main body 50 to be joined. In that case, the pins 40 may be sequentially supplied to the terminal main body 50 by a parts feeder or the like, and the cutting process can be omitted, so that the manufacturing process can be simplified.

Further, in the above-mentioned embodiment, the case of the round pin 40 is shown, but a pin type terminal may be constructed by using a pin having a sectional shape other than that. In that case, instead of the circular tubular portion, a tubular portion corresponding to the cross-sectional shape of the pin may be formed.

[0053]

As described above, according to the first aspect of the present invention, since the pin is fixed to the terminal body by welding, the mechanical and electrical coupling force between the pin and the terminal body is increased and the reliability is high. A flexible pin type terminal is obtained. Further, upon welding, since it is possible to perform welding while stably positioning while holding the pins in advance in the tubular portion, the reliability of welding is increased and the quality can be stabilized.

According to the second aspect of the present invention, the adhesion between the pin and the tubular portion is increased, the electric coupling force is increased, and at the time of welding,
The pin and the tubular portion can be joined in a more stable holding state, and the mechanical coupling force is further enhanced. Further, since it is not necessary to perform circumferential alignment when inserting the pin into the tubular portion, the pin can be easily inserted into the tubular portion by an automatic machine, and productivity can be improved.

According to the invention of claim 3, the welding strength is enhanced, the integrity of the pin and the terminal body is enhanced, and the quality is improved.

According to the invention of claim 4, the pin can be easily inserted and the productivity is improved.

According to the invention of claim 5, the pin can be easily inserted and the productivity is improved.

According to the sixth aspect of the present invention, it is possible to enhance the coupling force between the pin and the terminal body and to obtain a highly reliable pin type terminal. Further, since the coupling force is high, it is not necessary to insert the pin into the terminal body largely, unlike the fixing by caulking, and therefore the length of the pin can be shortened and the weight can be reduced.

According to the invention of claim 7, since the pin material can be supplied from the reel, it is easy to handle the pin material.

According to the invention of claim 8, the end portion of the pin material can be easily inserted into the cylindrical portion, and the productivity is improved. Further, since the end portion is rounded at the time of cutting, it is not necessary to separately form a step such as crushing the end portion, and the step is simplified.

According to the invention of claim 9, the pins previously cut to a predetermined length can be sequentially supplied to the terminal body by a parts feeder or the like and integrated with the terminal body, and the manufacturing process can be simplified.

According to the tenth aspect of the invention, since plating is not required at the terminal forming stage, no extra reel winding or the like is required and the manufacturing process can be simplified.

[Brief description of drawings]

FIG. 1 is an exploded plan view of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a terminal body according to an embodiment of the present invention,
(A) is a side view, (b) is a front view, (c) is a sectional view of both caulking piece portions.

3A and 3B are configuration diagrams of a pin type terminal according to an exemplary embodiment of the present invention in a first assembling stage, in which FIG. 3A is a plan view and FIG. 3B is a side view.

4A and 4B are configuration diagrams of a pin type terminal according to an embodiment of the present invention in a second assembling stage, in which FIG. 4A is a plan view and FIG. 4B is a side view.

5A and 5B are configuration diagrams of a pin type terminal according to an exemplary embodiment of the present invention in a third assembling stage, in which FIG. 5A is a plan view and FIG. 5B is a side view.

FIG. 6 is a perspective view used for explaining a manufacturing method according to an embodiment of the present invention.

FIG. 7 is a side view showing how the pin material is cut in the manufacturing method according to the embodiment of the present invention.

FIG. 8 is a perspective view showing a state of laser welding in the manufacturing method according to the embodiment of the present invention.

FIG. 9 is a side view of a conventional pin type terminal.

FIGS. 10A, 10B, and 10C are respectively shown in FIGS.
FIG. 3 is a sectional view taken along the lines A, B, and C.

FIG. 11 is a schematic diagram for explaining the first step of a conventional method for manufacturing a pin-type terminal.

FIG. 12 is a schematic diagram for explaining the work content at the end of the first step of the conventional method for manufacturing a pin-type terminal.

FIG. 13 is a schematic diagram for explaining the second step of the conventional method for manufacturing a pin-type terminal.

14A and 14B are schematic views for explaining the third step of the conventional method for manufacturing a pin-type terminal.

[Explanation of symbols]

 30-pin type terminal 40-pin 40a Pin material 42 End portion 46 Reel 50 Terminal body 54 Insulation cover crimping portion (electric wire crimping portion) 56 Core wire crimping portion (electric wire crimping portion) 58 Cylindrical portion (cylindrical portion) 60 Joint 62 taper portion 70 laser welding machine 72 laser beam P welding point

Claims (10)

[Claims] 1. A pin type terminal comprising a terminal body having a wire crimping portion and a pin fixed to the tip of the terminal body, wherein a tubular portion is formed at the tip of the terminal body, and a proximal end of the pin is provided in the tubular portion. A pin-type terminal, wherein the base end of the pin and the tubular portion are joined by welding in a state where the pin is inserted. 2. The pin type terminal according to claim 1, wherein the pin is a round pin having a circular cross section, and the cylindrical portion has a joint at one position in a circumferential direction and has a diameter in a free state. A pin-type terminal comprising a cylindrical portion having a circular cross section smaller than the outer diameter of the round pin. 3. The pin type terminal according to claim 2, wherein the base end of the pin and the cylindrical portion are welded at the joint. 4. The pin-type terminal according to claim 1, wherein an end edge of the tubular portion on the pin insertion side is provided with a taper portion that widens outward. Pin type terminal characterized by. 5. The pin type terminal according to claim 1, wherein an end portion of the pin on the side of insertion into the cylindrical portion is formed in a substantially hemispherical shape. . 6. A method of manufacturing a pin-type terminal comprising a terminal body having a wire crimping portion and a pin fixed to the tip thereof, wherein a tubular portion is formed at the tip of the terminal body when molding the terminal body. Then, the base end of the pin is inserted into the tubular portion, and in this state, the tubular portion and the proximal end of the pin are joined by laser welding. 7. The method of manufacturing a pin-type terminal according to claim 6, wherein the terminal body has a wire crimping portion on a proximal end side and a tubular portion on a distal end by press working with a progressive die. Is formed as a series of chains, the tip of the material of the pin supplied from the reel is inserted into the tubular portion of the one terminal body, and the material of the pin is cut at a position separated by a predetermined distance from the insertion position. A method for producing a pin-type terminal, comprising laser-welding a material of a pin and a tubular portion to separate the terminal body from the chain. 8. The method for manufacturing a pin type terminal according to claim 7, wherein the cutting end is formed into a substantially hemispherical shape by a cutting blade when the material of the pin is cut. Manufacturing method. 9. The method for manufacturing a pin-type terminal according to claim 6, wherein the terminal main body has a wire crimping portion on a proximal end side and a tubular portion on a distal end by press working with a progressive die. Is formed as a series of chains, the base end of the pin, which has been cut to a predetermined length in advance, is inserted into one cylinder of the terminal body, and the base end of the pin and the cylinder are laser-welded in that state. A method for manufacturing a pin-type terminal, characterized in that the terminal body is separated from the chain. 10. The method for manufacturing a pin-type terminal according to claim 6, wherein the pin or the material for the pin is pre-plated before being inserted into the tubular portion of the terminal body. And a method for manufacturing a pin-type terminal.