JP2003123935A - Method of manufacturing terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent permanent set of an elastic contact part of a terminal caused by wrenching. SOLUTION: Initial plastic deformation is generated in the elastic contact part by pressing the elastic contact part of the terminal in the deflection direction, and an elastic yield limit with every deflection of the elastic contact part is stabilized. When the plate thickness of a mating terminal is set to T, a displacement quantity of the elastic contact part for obtaining a required contact load is set to A, a spring-back quantity of the elastic contact part is set to C, a displacement quantity of the elastic contact part required for reaching a maximum spring load is set to E, and the clearance of the spring on the other side of deflection of the elastic contact part before pressing is set to F, F=T-A+C-E is realized. When the spring-back quantity of the elastic contact part is set to C, and the clearance of the spring on the other side of deflection of the elastic contact part at pressing time is set to D, D=T-A+C is realized. When the clearance of the spring of the elastic contact after the press is set to B, B=T-A is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a terminal in which the elastic proportional limit of the elastic contact portion of the terminal is improved to prevent the contact pressure from decreasing due to twisting of the elastic contact portion when the mating terminal is inserted. It is a thing.

[0002]

2. Description of the Related Art FIG. 11 shows, as one form of a terminal, a female terminal 41 having a substantially box-shaped electric contact portion 42.

As shown in FIG. 12, an elastic contact piece (elastic contact portion) 43 having a substantially inverted V shape is integrally formed in the electric contact portion 42. The elastic contact piece 43 is folded back from the front end of the top wall 50 of the electric contact portion 42, and includes a first half short slope portion 48 and a second half long slope portion 49. A contact point 44 is formed between the inclined portions 48 and 49, and a bottom wall 45 of the electric contact portion 42 is formed with two front and rear small mountain-shaped contacts 46 that are opposed to the contact point 44. Also,
A large mountain-shaped stop projection (stopper) 51 is formed on the top wall 50 so as to face the back surface of the contact 44.

An insertion gap 52 for the tab-shaped contact portion 7 of the mating male terminal is provided between the upper and lower contacts 44, 46. This gap 52 has a minimum tolerance plate thickness T of the tab-shaped contact portion 7.
The elastic contact allowance (deflection allowance) is secured by being set larger than that.

As shown in FIG. 11, the ceiling wall 50 is formed in double.
The top wall 50 and the bottom wall 45 continue orthogonally to the side walls 47, and the bottom wall 45 and the side walls 47 continue to the rear electric wire connection portion 55. The electric wire connecting portions 55 are provided on both sides of the bottom wall (substrate portion) 45,
A pair of crimping pieces 53 for the core portion (conductor portion) of the electric wire,
And a pair of crimping pieces 54 for the insulating coating of the electric wire.

The terminal 41 is punched from a sheet of conductive metal such as a copper alloy into a developed state by a press, and then bent and formed into a desired shape. The elastic contact piece 43 is folded back from the state of being extended forward from the top wall 50 and formed into a substantially reverse shape, and then, for example, the side wall 47 and the bottom wall 45 are bent, so that the elastic contact piece 43 is bent. Protect to wrap around.

The terminal 41 is inserted and locked in a terminal accommodating chamber of a male connector housing (not shown) made of synthetic resin with an electric wire (not shown) connected. The male connector housing and the female terminal 41 form a male connector. The mating male terminal is housed in the female connector housing, and the tab-shaped contact portion 7 projects into the connector fitting chamber of the male connector housing. By inserting the male connector into the connector fitting chamber, the tab-shaped contact portion 7 is inserted into the electrical contact portion 42 of the female terminal 41 and is sandwiched between the upper and lower contacts 44 and 46. Make elastic contact with.

In a connector (not shown) for connecting a board, for example, the bottom wall 45 of the terminal is not provided, and the elastic contact piece 43 is exposed (projected) to the outside, so that the circuit board (not shown) can be connected. By inserting into the connector, the elastic contact piece 43 comes into contact with the exposed conductor (terminal portion) of the terminal of the circuit board. Further, the elastic contact piece 43 may be integrally formed on the bottom wall 45 or the side wall 47 instead of the top wall 50. Further, instead of the plate-shaped elastic contact piece 43, an elastic contact portion having a round cross section may be used.

[0009]

However, in the above-mentioned conventional terminal and its manufacturing method, there is no problem when the mating male terminal (7) is normally inserted and used. In contrast, when the male terminal is slantedly inserted and the elastic contact piece 43 of the female terminal 41 is twisted by the male terminal, the elastic contact piece 43 largely bends and deforms beyond the elastic proportional limit. The contact pressure on the male terminal is weakened, and the reliability of the electrical connection is reduced. This problem is particularly likely to occur when the elastic contact piece 43 is once twisted, the male terminal is extracted and then inserted into the female terminal 41 again. The same applies when a circuit board (not shown) is used instead of the male terminal.

One form of the above problem is shown in FIG. FIG.
The vertical axis represents the pressing load (unit: N) of the elastic contact piece 43, and the horizontal axis represents the bending amount (unit: mm) of the elastic contact piece 43. 1N = 0.10197kgf≈0.1kgf
Is. In FIG. 13, the upper diagram 56 shows the state before prying, and the lower diagram 57 shows the state after prying.

The elastic contact force that was W (N) before the prying is drastically reduced to only 0.25 W (N) after the prying. The load reduction amount L is 0.75 W (N). W (N) and 0.2
5 W (N) is a numerical value when the gap 52 between the elastic contact piece 43 and the bottom wall 45 in FIG. 12 is T ₁ (mm). T ₁
(Mm) is the median tolerance of the plate thickness of the tab-shaped contact portion 7 of the male terminal. In the present specification, the contact force and the size of the terminal are shown not as a real number but as a comparison value for the sake of convenience, and it goes without saying that these numerical values vary depending on the size of the terminal.

Due to such a decrease in the contact force, the electrical conductivity is deteriorated, the transmission of the signal current becomes inaccurate, and the conduction resistance increases to cause the heating of the terminals. These adverse effects exceed the elastic proportional limit during normal use and the elastic contact piece 4
It also appears when 3 is bent.

In view of the above points, the present invention has an advantage in that even if the elastic contact portion of the terminal is twisted on the mating male terminal or the circuit board to cause excessive displacement beyond the elastic proportional limit, the elasticity of the mating terminal is increased. It is an object of the present invention to provide a method for manufacturing a terminal that can prevent (reduce) the contact pressure of the contact portion from decreasing as much as possible.

[0014]

In order to achieve the above object, in the method of manufacturing a terminal according to claim 1 of the present invention, the elastic contact portion of the terminal is pressed in the bending direction to thereby cause the elastic contact portion to contact the elastic contact portion. It is characterized in that initial plastic deformation is caused to stabilize the elastic limit for each bending of the elastic contact portion. With the above configuration, when a thin elastic contact piece is used as the elastic contact portion, the fatigue due to the twisting of the elastic contact portion, that is, a large decrease in the spring force is prevented. This is because the elastic contact part does not undergo large plastic deformation (since it has already been plastically deformed) due to initial (slight) plastic deformation, and the elastic contact part and the mating terminal do not. The contact pressure with is stable. The above configuration is extremely effective even when the mating terminal is inserted beyond the elastic limit in normal use.

A terminal manufacturing method according to a second aspect is the terminal manufacturing method according to the first aspect, wherein the spring gap F in the direction opposite to the flexure of the elastic contact portion before pressing is equal to the plate thickness T of the mating terminal. On the other hand, the displacement amount A of the elastic contact portion for obtaining the necessary contact load is removed, the spring back amount C of the elastic contact portion is added, and the displacement amount E of the elastic contact portion required to reach the maximum spring load is removed. It is characterized by the value. As in the above configuration, the displacement amount A for obtaining the necessary contact load is subtracted from the plate thickness T of the mating terminal, the spring back amount C is added, and the displacement amount E for obtaining the maximum spring load is reduced. The spring clearance F can be determined. Here, T>E>C> A.

A method of manufacturing a terminal according to a third aspect is the method of manufacturing a terminal according to the first or second aspect, wherein the spring gap D in the direction opposite to the flexure of the elastic contact portion at the time of pressing is equal to that of the mating terminal 7. It is a value obtained by dividing the plate thickness T by the displacement amount A of the elastic contact portion for obtaining the necessary contact load and adding the spring back amount C of the elastic contact portion. As in the above configuration, the displacement amount A for obtaining the required contact load is subtracted from the plate thickness T of the mating terminal, and the spring back amount C is added to obtain the spring gap D necessary for pressing the elastic contact portion, that is, setting. it can. Elastic contact part is D
The setting process is completed by flexing and deforming so as to form the gap. Here, T>C> A.

A method of manufacturing a terminal according to a fourth aspect is the method of manufacturing a terminal according to any one of the first to third aspects, wherein a spring gap B in a direction opposite to the flexure formed by the elastic contact portion restored after the pressing is , A value obtained by dividing the displacement amount A of the elastic contact portion for obtaining the required contact load from the plate thickness T of the mating terminal 7. As in the above configuration, by subtracting the displacement amount A for obtaining the necessary contact load from the plate thickness T of the mating terminal,
The spring gap B of the elastic contact portion in the product state can be obtained. Here, T> A.

A method of manufacturing a terminal according to claim 5 is the method of manufacturing a terminal according to any one of claims 1 to 4, wherein the maximum spring gap G in the direction opposite to the bending of the elastic contact piece is the mating terminal. The displacement amount A of the elastic contact portion for obtaining the necessary contact load is subtracted from the plate thickness T of the above, the spring back amount C of the elastic contact portion is added, and a margin gap Δx in the bending direction of the elastic contact portion is added. Is a value obtained by adding. As in the above configuration, the displacement amount A for obtaining the required contact load is subtracted from the plate thickness T of the mating terminal, the spring back amount C is added, and the allowance gap Δx is added, whereby the maximum spring gap that bends until the elastic contact piece abuts. Is required. By providing the allowance gap Δx at the time of setting according to the third aspect, the pressing process can be performed accurately without the elastic contact piece contacting.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for manufacturing a terminal according to the present invention will be described in detail below with reference to the drawings.

1 to 4 show the process of processing the elastic contact piece (elastic contact portion) 3 in the box-shaped electric contact portion 2 of the female terminal 1 in reverse from the product state. The form of the terminal 1 is similar to that shown in the prior art, and the elastic contact piece 3
Is surrounded by a bottom wall 5, side walls 17, and a ceiling wall 10.

In the method of manufacturing a terminal according to the present invention, the elastic contact piece 3 in the electric contact portion 2 of the female terminal 1 is plastically deformed to some extent in the bending direction by the setting (pre-setting) process, and the elastic contact piece 3 is formed. The elastic limit of is stabilized against repeated flexural deformation.

FIG. 5 shows load-deflection diagrams of the elastic contact piece 3 before and after setting. Hereinafter, the configurations of FIGS. 1 to 4 will be sequentially described with reference to FIG.

As shown in the state of the finished product of the terminal 1 in FIG.
The contact point 4 and the electric contact portion 2 at the longitudinal middle portion of the elastic contact piece 3
The gap size (spring gap) B between the bottom wall 5 and the contact 6 is S
(Mm) is set. This numerical value of S (mm) is set as follows.

The plate thickness of the tab-shaped contact portion 7 of the mating male terminal (see FIG. 12 of the prior art) is T ₁ ± α = 5.12S ±
It is 0.12S (mm), and the allowable minimum plate thickness T of the tab-shaped contact portion 7 is T ₁ −α = 5S (mm). Thickness 5S (m
The contact load of the elastic contact piece 3 with respect to the tab-shaped contact portion 7 of m) is 0.86 W {N (Newton)} at least in design in order to perform reliable electrical connection. Elastic contact piece 3 for obtaining 0.86 W (N)
The deflection amount (displacement amount) is A = S (mm) as shown in the line diagram 9 after the setting process in FIG. Therefore, the gap between the elastic contact piece 3 and the bottom wall 5, that is, the spring gap B is
B = MIN tab thickness (T ₁ -α) -A = 5S-S = 4S
(Mm).

In the diagram 8 of FIG. 5 before the setting process, the elastic contact piece of the existing terminal shown in the prior art is set in the free state P3.
The pressing load and the amount of flexure of the elastic contact piece 3 when the pressure is gradually applied from (POINT3) to the stop position P4 in the bending direction are continuously shown. Diagram 9 after the setting process shows that the elastic contact piece 3 is once initially plastically deformed in the bending direction by using another terminal having the same shape as that before the setting process, and then the elastic contact piece 3 is pressed again. The pressing load and the bending amount of the elastic contact piece are continuously shown. Details of the setting process will be described with reference to FIGS.

In FIG. 5, the initial position of the elastic contact piece 3 after the setting process of FIG. 1 is indicated by P1. The displacement difference between P1 and P3, that is, BF = 4S-3S = S (mm) is the initial amount of plastic deformation of the elastic contact piece 3.

Further, in FIG. 5, the spring back amount C of the elastic contact piece 3, that is, the deflection amount D = 5.
C, which is the difference D−B between 28 S (mm) and the initial deflection amount (plastic deformation amount) B = 4 S (mm) in the diagram 9 after setting, is C = 5.28 S−4 S = 1.28 S. (Mm).

Therefore, in the setting process of FIG. 2, that is, when the elastic contact piece 3 is flexed and deformed, the spring gap D at the press bottom dead center which gives the product spring gap B = 4S (mm) at the position P1 is calculated backward. , D = B + C = (T-A +
C) = 4S + 1.28S = 5.28S (mm).
In the press bottom dead center state of FIG. 2, a margin Δx of 0.16 S (mm) is provided between the elastic contact piece 3 and the stop projection 11 of the top wall 10. FIG. 2 corresponds to the P2 position in FIG. The free end 12 of the elastic contact piece 3 contacts the top wall 10 during the setting process.

The spring back amount C = 1.28S
In order to obtain (mm), it is necessary to set the position P3, that is, the free state position of the elastic contact piece 3 before the setting process in FIG. 3, so that the maximum spring load is generated at the position P2. The displacement amount E required to reach the maximum spring load is 2.28 S (mm) from FIG. Therefore, the spring clearance F before setting in FIG. 3 is F = D−E = (T−A + C−
E) = 5.28S-2.28S = 3S (mm).

Further, as shown in FIG. 4 in which the elastic contact piece 3 is brought into contact with the stop projection 11 for preventing excessive displacement, the elastic contact is made at the press bottom dead center position P2 in FIGS. The gap Δx between the piece 3 and the stop projection 11 is 0.16 S (m
m) is necessary. Therefore, the contact position P in FIGS.
4, the spring gap (maximum spring gap) G is G = D + Δ
x = (T−A + C + Δx) = 5.28S + 0.16S =
It is 5.44 S (mm). In this way, the spring gap G, that is, the gap size between the elastic contact piece 3 and the bottom wall 5, that is, the position of the bottom wall 5 is set. The Δx displacement after the setting process is not within the elastic displacement range, but is within a very small range, and variations in the load are almost negligible and within the error range, and it can be said that there is no problem.

The method of manufacturing a terminal according to the present invention is to mold the elastic contact piece 3 in the order of FIG. 3 → FIG. 2 → FIG. That is, first, as in the state before the setting process in FIG. 3, at least a displacement (E = 2.28 S (mm) in FIG. 5) at which the maximum spring load of the elastic contact piece 3 is obtained is ensured (correctly, E + margin amount). The elastic contact piece 3 is bent so as to secure Δx).

The spring clearance F is set as F = TA + CE. T is the minimum tab thickness, A is the displacement for obtaining the required contact load of 0.86 W (N), C is the spring back amount, and E is the displacement required to reach the maximum spring load.

Next, the elastic contact piece 3 is displaced by the dimension E as shown in FIG. 2 from the state before the setting process of FIG. As a result, the elastic contact piece 3 is set. The spring clearance D is set as D = TA + C. T is the minimum tab thickness, A is the displacement amount for obtaining the required contact load of 0.86 W (N), and C is the springback amount.

By releasing the pressing load of FIG. 2, the elastic contact piece 3 is bent by the spring back amount C and restored in the opposite direction as shown in FIG. 1, and the spring for obtaining the necessary contact load of 0.86 W (N) is obtained. The terminal 1 having the gap B is completed. The spring clearance B = TA. T is the minimum tab thickness, and A is the displacement amount for obtaining the required contact load of 0.86 W (N).

The spring clearance B corresponds to the tab-shaped contact portion 7 having the minimum plate thickness, and the maximum plate thickness T as shown in FIG.
₂ = 5.24S (mm) tab-shaped contact part, displacement A ₂ = 1.24S (mm), intermediate (standard) plate thickness T ₁ = 5.12S (mm) tab-shaped contact When it corresponds to a part, the displacement amount A ₁ = 1.12 S (mm). However, as a design, the tab-shaped contact portion 7 having the minimum plate thickness T as described above is used.
It is necessary to set each dimension according to.

Regardless of the thickness of the tab-shaped contact portion 7,
Since the elastic contact piece 3 contacts the tab-shaped contact portion 7 within the elastic proportional limit as shown in FIG. 5, the elastic contact piece 3 does not sag, that is, a large plastic deformation does not occur, and a stable contact pressure is always obtained.

FIG. 6 shows a comparison of the loss load due to prying between the conventional terminal without setting and the terminal 1 of the present invention with setting.

In FIG. 6, the diagram 8 on the left side is the conventional one, and the diagram 9 on the right side is the one according to the present invention. In the conventional case, the tab with the minimum plate thickness of 5S (mm) is obtained when the elastic contact piece 3 is normally bent (line 8) and when it is bent after prying (after excessive bending) (line 13). 0.29 for the flat contact part 7
While there is a load loss L ₁ of W (N), in the case of the present invention, when the elastic contact piece 3 is normally bent (line 9) and when it is bent after prying (after excessive bending) ( With the diagram 14), a load loss L _{2 of} only 0.13 W (N) occurs. The load loss difference between the two is 0.16 W (N).

This is because the elastic force of the elastic contact piece 3 is greatly reduced at the time of normal terminal insertion and at the time of re-insertion after prying insertion when setting is not performed, whereas when setting is performed, normal elasticity is obtained. The elastic force of the elastic contact piece 3 slightly changes (decreases) between the terminal insertion and the re-insertion after prying insertion.
It is due to not doing.

That is, by the setting process, the elastic contact piece 3 is plastically deformed in the bending direction by S (mm) (position P3).
And P1), whereby the elastic proportional limit of the elastic contact piece 3 is improved. That is, by causing the initial plastic deformation in advance, the decrease in the spring force of the elastic contact piece 3 after the twisting (excessive bending) is suppressed.

This is because the elastic contact piece 3 is brought into contact with the tab-shaped contact portion 7 within the elastic proportional limit, and after the setting process, the respective diagrams 9 and 14 are linear (proportional). It is also clear from the slope.

In FIG. 6, T is the minimum tab thickness (a spring gap when the male terminal having the minimum tab thickness is inserted), and G is the elastic contact piece 3.
The spring clearance when J abuts on the stop projection 11, J indicates the excess deflection amount (GT), respectively. These values are the same for the elastic contact piece not set and the elastic contact piece 3 set. That is, the product spring gap B after the setting process includes the bending allowance A for obtaining the necessary contact load with the tab-shaped contact portion 7 as described in FIG.

7 to 10 show one form of a concrete method of the above setting process.

As shown in FIG. 7, the elastic contact pieces 3'of the terminals 1'are placed in a state in which the terminals 1'are developed side by side (the terminals 1'are punched in parallel from a single conductive metal plate). The setting process is performed by bending and deforming one by one with the molding die 15.

In FIG. 7, the elastic contact piece 3'extends forward from the front end of the top wall 10 'and continues to the chain band 16 on the front side in the orthogonal direction. Top wall 10 'follows side wall 17', then side wall 17 '
Is connected to the bottom wall 5 ′, the bottom wall 5 ′ is connected to the respective crimping pieces 19 and 20 of the wire connection part 21 via the substrate part 18, and the wire connection part 21
Is connected via a connecting piece 22 to a chain chain 23 on the rear side in the orthogonal direction. The chain bands 16 and 23 are carriers for sending each terminal 1 after bending to an automatic crimping machine (not shown), and are cut and discarded simultaneously with crimping of electric wires (not shown).

The molding die 15 is positioned above the ceiling wall 10 ', and is a vertically movable piece mold 24 for setting the elastic contact piece 3', and supports the piece mold 24 so that the piece mold 24 can be moved up and down. A pressing die 25 for pressing at least the entire electric contact portion 2 ',
A primary working die 26 for primary bending the elastic contact piece 3'is included.

As shown in FIG. 8, first, with the portion of the terminal 1'excluding the elastic contact piece 3'pressed against the lower die by the upper die 25, the raising operation of the primary working die 26 (the upper inclined surface 27) is performed. Lifts the elastic contact piece 3 ') and presses the elastic contact piece 3'
Are vertically formed, and then the elastic contact piece 3 ′ is bent in the folding direction by the forward movement of the primary working die 26.
The tip portion 28 of the pressing die 25 is formed so as to project in a substantially wedge shape,
The elastic contact piece 3'is bent and formed along the inclined upper surface 28a of the tip portion 28. The primary processing die 26 has a groove portion 30 that allows the wedge-shaped tip portion 28 and the bent portion 29 of the elastic contact piece 3'to enter so as to bend and bend the elastic contact piece 3 '.
have.

Next, as shown in FIG. 9, the first piece mold 31 descends to press the front portion of the elastic contact piece 3 ′ in the vicinity of the bending portion 29 in the bending direction. Free end (rear end) of elastic contact piece 3 '
12 is close to the top wall 10 '. The first piece mold 31 has a tapered and narrow slightly inclined front end surface 32, and the front end portion 32 presses the front half of the elastic contact piece 3 ′ toward the top wall 10 ′. The steps up to this point are the same as the conventional steps, and the processing before setting in FIG. 3 is completed in the steps in FIGS.

Next, as shown in FIGS. 10A and 10B, the elastic contact piece 3 is set using the second piece 24.
The second piece 24 is provided so as to be movable up and down instead of the first piece 31 (FIG. 9) and has a horizontal pressing surface 33 at its tip. The pressing surface 33 has a substantially inverted V-shaped taper shape corresponding to the elastic contact piece 3 ′ curved in the width direction as shown in FIG. The contact surface of the elastic contact piece 3'is pressed by the pressing surface 33.

The central portion of the elastic contact piece 3 is close to the stop projection 11, and the free end 12 of the elastic contact piece 3 contacts the top wall 10 '. As a result, the setting process is performed, and the elastic contact piece 3 is always used within the elastic limit due to the initial plastic deformation of the elastic contact piece 3. The second piece 24 moves up and the elastic contact piece 3 bends and restores in the opposite direction. After that, the side walls 17 ', the top wall 10', and the wire connection portion 21 are bent and formed by another forming die, and the terminal 1 in the product state of FIG. 1 is obtained.

In the above embodiment, the female terminal 1 having the box-shaped electric contact portion 2 is used. However, as described in the conventional technique, the bottom wall 5 is opened. The method of manufacturing a terminal according to the present invention can be applied to a structure in which the elastic contact piece 3 is exposed (projected) to the outside. Also,
The present invention can be applied to a terminal that does not project the contacts 4 and 6 and a terminal that does not use the stop projection 11. Further, the elastic contact piece 3 may be provided on the bottom wall 5 or the side wall 17, that is, any one wall portion of the electric contact portion 2 instead of the top wall 10. The elastic contact piece 3 may be formed separately from the wall portion of the electric contact portion 2.

It is also possible to increase the elastic proportional limit of the elastic contact piece 3 by annealing the elastic contact piece 3, that is, the electric contact portion 2 as a whole after the setting process, for example.

[0053]

As described above, according to the first aspect of the present invention, particularly when a thin plate elastic contact piece is used as the elastic contact portion, the elastic contact portion is liable to be twisted, that is, the spring force. Therefore, even if the mating terminal is inserted and then the mating terminal is inserted again after the mating elastic terminal is twisted, the contact pressure is ensured and the reliability of the electrical connection between the terminals is improved. Is improved. This effect is
This also applies to the case where the mating terminal is inserted beyond the elastic limit in normal use. For example, even when the mating terminal has a thicker plate than usual, it can be tolerated to some extent, thereby improving the product yield.

According to the second aspect of the invention, the displacement amount A for obtaining the required contact load is subtracted from the plate thickness T of the mating terminal, the spring back amount C is added, and the displacement amount E for obtaining the maximum spring load is reduced. The spring gap F can be accurately defined before the elastic contact portion is pressed, that is, before setting. As a result, it is possible to accurately press the elastic contact portion.

According to the third aspect of the present invention, the displacement amount A for obtaining the required contact load is subtracted from the plate thickness T of the mating terminal, and the spring back amount C is added to the pressing process, that is, the setting process of the elastic contact portion. The required spring clearance D can be accurately obtained, and the setting process can be accurately performed by flexibly deforming the elastic contact portion so as to become the clearance of D.

According to the fourth aspect of the invention, the spring gap B of the elastic contact portion in the product state can be accurately obtained by subtracting the displacement amount A for obtaining the necessary contact load from the plate thickness T of the mating terminal. . This makes it possible to easily and reliably obtain a terminal that is resistant to excessive displacement such as twisting.

According to the fifth aspect of the invention, the displacement amount A for obtaining the required contact load is subtracted from the plate thickness T of the mating terminal, the spring back amount C is added, and the margin gap Δx is added.
It is possible to accurately determine the maximum spring gap that bends until the elastic contact piece abuts. Further, by providing the allowance gap Δx at the time of pressing in the invention according to the third aspect, the pressing can be performed more accurately without contacting the elastic contact piece.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a terminal formed by a method for manufacturing a terminal of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state during setting processing in the method of manufacturing a terminal of the present invention.

FIG. 3 is a vertical cross-sectional view showing a state of the terminal before setting processing.

FIG. 4 is a vertical cross-sectional view showing a state where the elastic contact piece of the terminal is also bent to the maximum.

[Fig. 5] Load showing the state before and after the terminal setting process-
It is a bending diagram.

FIG. 6 is a load-deflection diagram showing a comparison between setting and non-setting of terminals.

FIG. 7 is a plan view showing one embodiment of a method of molding a terminal.

FIG. 8 is a side view of an essential part showing the primary bending state of the elastic contact piece of the terminal.

FIG. 9 is a side view of an essential part showing a second bending state of the elastic contact piece.

10A is a side view of a main part showing a state of the elastic contact piece during setting processing, and FIG. 10B is a sectional view taken along line XX of FIG.

FIG. 11 is a perspective view showing an existing female terminal.

FIG. 12 is a vertical sectional view showing an electric contact portion of an existing terminal.

FIG. 13 is also a load-deflection diagram showing a problem of the existing terminal.

[Explanation of symbols]

1 terminal 3 Elastic contact piece (elastic contact part) 7 Tab-shaped contact part of mating terminal A Displacement to obtain the required contact load B Spring gap after pressing C Spring back amount D Spring gap when pressed E Displacement required to reach maximum spring load F Spring gap before pressing G Maximum spring clearance T Mating terminal plate thickness (male tab thickness) Δx margin gap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Haruki Yoshida             206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Yazaki             Parts Co., Ltd. (72) Inventor Kei Wada             206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Yazaki             Parts Co., Ltd. F-term (reference) 5E063 GA04 GA05

Claims (5)

[Claims] 1. The elastic contact portion of the terminal is pressed in the bending direction to cause initial elastic deformation of the elastic contact portion,
A method for manufacturing a terminal, characterized in that the elastic limit of each bending of the elastic contact portion is stabilized. 2. The spring gap F in the direction opposite to the bending formed by the elastic contact portion before pressing is obtained by dividing the displacement amount A of the elastic contact portion for obtaining a necessary contact load with respect to the plate thickness T of the mating terminal. 2. The method for manufacturing a terminal according to claim 1, wherein the spring back amount C of the elastic contact portion is added and the displacement amount E of the elastic contact portion required to reach the maximum spring load is divided. 3. The spring gap D in the direction opposite to the flexure formed by the elastic contact portion at the time of pressing, with respect to the plate thickness T of the mating terminal,
3. The method for manufacturing a terminal according to claim 1, wherein the displacement amount A of the elastic contact portion for obtaining the required contact load is removed, and the spring back amount C of the elastic contact portion is added. . 4. The spring gap B in the direction opposite to the bending formed by the elastic contact portion restored after the pressing is obtained by subtracting the displacement amount A of the elastic contact portion for obtaining the necessary contact load from the plate thickness T of the mating terminal. The method for manufacturing a terminal according to any one of claims 1 to 3, wherein: 5. The maximum spring gap G in the direction opposite to the bending of the elastic contact piece is obtained by dividing the displacement amount A of the elastic contact portion for obtaining the necessary contact load with respect to the plate thickness T of the mating terminal, 5. The terminal according to claim 1, wherein the spring contact amount C of the elastic contact portion is added, and a margin gap Δx in the bending direction of the elastic contact portion is added. Method.