JP3711057B2 - Terminal manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a terminal that improves the elastic proportional limit of an elastic contact portion of a terminal and suppresses a decrease in contact pressure due to the twisting of the elastic contact portion when a mating terminal is inserted.
[0002]
[Prior art]
FIG. 11 shows a female terminal 41 having a substantially box-shaped electrical contact portion 42 as one form of the terminal.
[0003]
As shown in FIG. 12, an elastic contact piece (elastic contact portion) 43 having a substantially reverse shape is integrally formed in the electrical contact portion 42. The elastic contact piece 43 is folded back from the front end of the top wall 50 of the electrical contact portion 42, and includes a first-half short inclined portion 48 and a second-half long inclined portion 49. A contact 44 protrudes between the inclined portions 48 and 49, and two small mountain-shaped contacts 46 are formed on the bottom wall 45 of the electrical contact portion 42 so as to face the contact 44. Further, a large mountain-shaped stop protrusion (stopper) 51 is formed on the top wall 50 so as to face the back surface of the contact 44.
[0004]
Between the upper and lower contacts 44, 46, an insertion gap 52 for the tab-like contact portion 7 of the mating male terminal is provided, and this gap 52 is set smaller than the minimum tolerance plate thickness T of the tab-like contact portion 7. Thus, an elastic contact allowance (flexure allowance) is secured.
[0005]
As shown in FIG. 11, the top wall 50 is formed in a double manner, the top wall 50 and the bottom wall 45 continue orthogonally to the side walls 47, and the bottom wall 45 and both side walls 47 continue to the rear wire connection portion 55. The electric wire connecting portion 55 includes a pair of crimping pieces 53 for the core wire portion (conductor portion) of the electric wire and a pair of crimping pieces 54 for the insulating coating portion of the electric wire on both sides of the bottom wall (substrate portion) 45.
[0006]
The terminal 41 is punched from a conductive metal plate such as a copper alloy into a developed state by a press, and then bent into a required shape. The elastic contact piece 43 is folded back from the state 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 to form the elastic contact piece 43. Protects to envelop.
[0007]
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 thereto. The male connector housing and the female terminals 41 constitute a male connector. The mating male terminal is accommodated in the female connector housing, and the tab-like 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-like 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. Makes elastic contact.
[0008]
For example, in a connector for board connection (not shown), there is no bottom wall 45 of the terminal, the elastic contact piece 43 is exposed (projected) to the outside, and a circuit board (not shown) is placed in the connector. By inserting, the elastic contact piece 43 contacts the exposed conductor (terminal part) of the terminal of the circuit board. 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-like elastic contact piece 43, an elastic contact portion having a round cross section may be used.
[0009]
[Problems to be solved by the invention]
However, in the conventional terminal and the manufacturing method thereof, there is no problem when the other male terminal (7) is normally inserted and used, but the male terminal is inserted obliquely with respect to the female terminal 41. For example, when the elastic contact piece 43 of the female terminal 41 is squeezed with a male terminal, the elastic contact piece 43 greatly bends and deforms beyond the elastic proportional limit. This leads to a problem that the reliability of the general connection is lowered. This problem is particularly likely to occur when the elastic contact piece 43 is squeezed once and then the male terminal is extracted and re-inserted into the female terminal 41. The same applies when a circuit board (not shown) is used in place of the male terminal.
[0010]
One form of the above problem is shown in FIG. In FIG. 13, the vertical axis represents the pressing load (unit: N) of the elastic contact piece 43, and the horizontal axis represents the amount of deflection (unit: mm) of the elastic contact piece 43. 1N = 0.11097 kgf≈0.1 kgf. In FIG. 13, the upper diagram 56 shows a state before prying, and the lower diagram 57 shows a state after prying.
[0011]
The elastic contact force, which was W (N) before prying, is drastically reduced to only 0.25 W (N) after prying. The load reduction amount L is 0.75 W (N). W (N) and 0.25 W (N) are both numerical values 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-like contact portion 7 of the male terminal. In the present specification, for convenience, the contact force and dimensions of the terminals are shown as comparative values instead of real numbers, and it goes without saying that these numerical values vary depending on the size of the terminals.
[0012]
Due to such a decrease in the contact force, the conductivity is deteriorated, the transmission of the signal current becomes inaccurate, the conduction resistance is increased, and the terminal is heated. These adverse effects also appear when the elastic contact piece 43 is bent beyond the elastic proportional limit during normal use.
[0013]
In view of the above-described points, the present invention provides an elastic contact portion with respect to the mating terminal even when the mating male terminal or circuit board or the like is over-displaced beyond the elastic proportional limit by squeezing the elastic contact portion of the terminal. It aims at providing the manufacturing method of the terminal which can prevent the fall of a contact pressure as much as possible (it keeps low).
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a method for manufacturing a terminal according to claim 1 of the present invention is such that an elastic contact piece in an electrical contact portion of a female terminal is pressed in a bending direction, thereby initializing the elastic contact piece. A method for manufacturing a terminal that causes plastic deformation and stabilizes the elastic limit for each bending of the elastic contact piece, wherein the thickness of the tab-shaped contact portion of the mating male terminal is T, and the required contact load is obtained. The amount of displacement of the elastic contact piece is A, and the difference between the amount of spring back of the elastic contact piece, that is, the amount of displacement at the point where the maximum spring load before pressing is generated and the initial amount of plastic deformation after pressing is C, It is necessary to reach the maximum spring load, that is, the maximum load when the elastic contact piece is pressed in a state where the free end portion of the elastic contact piece is in contact with the wall of the electric contact portion on the contact piece bending side. When the displacement amount of the elastic contact piece is E, first, Serial elastic contact piece as the spring gap F is the size of the (T-A + C-E ) between the pressing process prior to said resilient contact piece and the contact piece deflection opposite wall portion of the electrical contact virtual Then, the elastic contact piece is pressed and displaced in the bending direction by the dimension E, the pressure is released, the elastic contact piece is spring-backed , and then the wall of the electrical contact portion on the side of the contact piece bending side is bent. The wall portion orthogonal to the contact piece and the wall portion on the opposite side of the contact piece bending are bent to finally obtain a spring gap having a dimension of (TA).
[0015]
With the above-described configuration, it is possible to prevent a sag caused by a thin plate elastic contact piece or the like, that is, a significant decrease in spring force. This is because the elastic contact piece undergoes an initial (minor) plastic deformation, so that it does not cause a large plastic deformation at the time of twisting (because the plastic deformation has already occurred). The contact pressure with the terminal is stabilized. The above configuration is very effective even when the mating male terminal is inserted beyond the elastic limit in normal use.
[0016]
That is, by reducing the displacement amount A for obtaining the required contact load from the plate thickness T of the mating male terminal, adding the springback amount C, and reducing the displacement amount E for obtaining the maximum spring load, the spring gap before pressing, that is, setting processing F can be obtained. Here, T>E>C> A.
Further, by subtracting the displacement amount A for obtaining the required contact load from the plate thickness T of the mating male terminal and adding the spring back amount C, the spring gap D necessary for pressing the elastic contact piece, that is, setting processing can be obtained. The setting process is completed by bending and deforming the elastic contact piece so as to form a gap D. Here, T>C> A.
Furthermore, the spring gap B of the elastic contact piece in the product state can be obtained by subtracting the displacement amount A for obtaining the necessary contact load from the plate thickness T of the mating male terminal. Here, T> A.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Below, one Embodiment of the manufacturing method of the terminal which concerns on this invention is described in detail based on drawing.
[0020]
1 to 4 show the process of processing the elastic contact piece (elastic contact portion) 3 in the box-shaped electrical contact portion 2 of the female terminal 1 in reverse from the product state. The form of the terminal 1 is the same as that shown in the prior art, and the elastic contact piece 3 is surrounded by the bottom wall 5, the side wall 17, and the top wall 10.
[0021]
The manufacturing method of the terminal according to the present invention is such that the elastic contact piece 3 in the electrical contact portion 2 of the female terminal 1 is plastically deformed to some extent by a setting (pre-setting) process, and the elastic limit of the elastic contact piece 3 Is stabilized against repeated bending deformation.
[0022]
FIG. 5 shows a load-deflection diagram before and after the setting process of the elastic contact piece 3. Hereinafter, the configurations of FIGS. 1 to 4 will be described in order with reference to FIG. 5.
[0023]
As shown in the state of the finished product of the terminal 1 in FIG. 1, the gap dimension (spring gap) B between the contact 4 at the middle portion in the longitudinal direction of the elastic contact piece 3 and the contact 6 at the bottom wall 5 of the electrical contact portion 2 is 4S (mm) is set. This numerical value of 4S (mm) is set as follows.
[0024]
The thickness of the tab-like contact portion 7 (see FIG. 12 of the prior art) of the mating male terminal is T ₁ ± α = 5.12S ± 0.12S (mm), and the allowable minimum of the tab-like contact portion 7 The plate thickness T is T ₁ −α = 5 S (mm). The contact load of the elastic contact piece 3 with respect to the tab-like contact portion 7 having a plate thickness of 5 S (mm) needs to be 0.86 W {N (Newton)} at least in terms of design in order to perform reliable electrical connection. The deflection amount (displacement amount) of the elastic contact piece 3 for obtaining the necessary contact load of 0.86 W (N) is A = S (mm) as shown in the diagram 9 after the setting process in FIG. Accordingly, 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).
[0025]
The diagram 8 before the setting process in FIG. 5 shows the pressing when the elastic contact piece of the existing terminal shown in the prior art is gradually pressed from the free state P3 (POINT3) to the stop position P4 in the bending direction. The load and the deflection amount of the elastic contact piece 3 are shown continuously. The diagram 9 after the setting process shows that the elastic contact piece 3 is initially plastically deformed in the bending direction once 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 amount of bending of the elastic contact piece are shown continuously. Details of the setting process will be described with reference to FIGS.
[0026]
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.
[0027]
Further, in FIG. 5, the spring back amount C of the elastic contact piece 3, that is, the deflection amount D = 5.28S (mm) at the point P2 at which the maximum spring load in FIG. 8 before the setting processing occurs, and the line after the setting processing C, which is the difference DB from the initial deflection amount (plastic deformation amount) B = 4S (mm) in FIG. 9, is C = 5.28S-4S = 1.28S (mm).
[0028]
Accordingly, when the spring clearance D at the press bottom dead center at which the product spring clearance B = 4S (mm) at the position P1 can be obtained in the setting process of FIG. B + C = (TA−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 stopping projection 11 of the top wall 10. FIG. 2 corresponds to the position P2 in FIG. The free end 12 of the elastic contact piece 3 contacts the top wall 10 during the setting process.
[0029]
In order to obtain the spring back amount C = 1.28 S (mm), the position P3, that is, the free state position of the elastic contact piece 3 before the setting process in FIG. 3 is set so that the maximum spring load is generated at the position P2. There is a need to. The displacement E required to reach the maximum spring load is 2.28 S (mm) from FIG. Therefore, the spring clearance F before the setting process in FIG. 3 is F = DE = (TA + CE) = 5.28S-2.28S = 3S (mm).
[0030]
Further, as shown in FIG. 4 in which the elastic contact piece 3 is brought into contact with the stop protrusion 11 for preventing excessive displacement, the elastic contact piece 3 and the elastic contact piece 3 at the press bottom dead center position P2 in FIGS. The clearance Δx between the stop protrusion 11 and the stop protrusion 11 needs to be about 0.16 S (mm). Accordingly, the spring gap (maximum spring gap) G at the contact position P4 in FIGS. 4 and 5 is G = D + Δx = (TA−C + Δx) = 5.28S + 0.16S = 5.44S (mm). In this manner, the spring gap G, that is, the gap dimension between the elastic contact piece 3 and the bottom wall 5, that is, the position of the bottom wall 5 is set. Although the Δx displacement after the setting process is not within the elastic displacement range, it is an extremely small range, and the variation in the load is within an error range so that it can be almost ignored.
[0031]
The terminal manufacturing method of the present invention is to form 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) that can obtain the maximum spring load of the elastic contact piece 3 is ensured (exactly E + margin). 1 to 3, the elastic contact piece 3 is bent (for convenience of explanation, the electric contact portion 2 is shown in a state after being bent (details will be described later). 7 to FIG. 10).
[0032]
The spring gap F is set as F = TA + CE. T is the minimum tab thickness, A is the amount of displacement to obtain the required contact load of 0.86 W (N), C is the amount of spring back, and E is the amount of displacement necessary to reach the maximum spring load.
[0033]
Next, the elastic contact piece 3 is displaced by the dimension E as shown in FIG. Thereby, the elastic contact piece 3 is set. The spring gap D is set as D = TA−C. T is the minimum tab thickness, A is the amount of displacement to obtain the required contact load of 0.86 W (N), and C is the amount of spring back.
[0034]
By releasing the pressing load in 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 gap B for obtaining the required contact load of 0.86 W (N) is obtained. The terminal 1 having it is completed. The spring gap B = TA. T is the minimum tab thickness, and A is the amount of displacement for obtaining the required contact load of 0.86 W (N).
[0035]
The spring gap B corresponds to the tab-shaped contact portion 7 having the minimum plate thickness. When the spring gap B corresponds to the tab-shaped contact portion having the maximum plate thickness T ₂ = 5.24 S (mm) as shown in FIG. In the case of corresponding to the tab-shaped contact portion of the displacement A ₂ = 1.24 S (mm) and the intermediate (standard) plate thickness T ₁ = 5.12 S (mm), the displacement A ₁ = 1.12 S (mm). Become. However, in terms of design, it is necessary to set each dimension corresponding to the tab-like contact portion 7 having the minimum thickness T as described above.
[0036]
Regardless of the thickness of the tab-like contact portion 7, the elastic contact piece 3 contacts the tab-like contact portion 7 within the elastic proportional limit as shown in FIG. It does not occur and a stable contact pressure is always obtained.
[0037]
FIG. 6 shows a comparison of the loss load due to the twisting of the conventional terminal which is not set and the set terminal 1 of the present invention.
[0038]
In FIG. 6, the left diagram 8 is the conventional one, and the right diagram 9 is the present invention. In the conventional case, the tab with the minimum thickness 5S (mm) is obtained when the elastic contact piece 3 is bent normally (line 8) and when it is bent after bending (after excessive bending) (line 13). In contrast to the load loss L ₁ of 0.29 W (N) with respect to the contact portion 7, in the case of the present invention, when the elastic contact piece 3 is bent normally (line 9) and after being twisted (excess) In the case of bending (after bending) (line 14), only a load loss L ₂ of 0.13 W (N) occurs. The load loss difference between them is 0.16 W (N).
[0039]
This is because the elastic force of the elastic contact piece 3 is greatly reduced when the terminal is not set and when the terminal is inserted normally and when the terminal is reinserted after the prying is inserted. This is due to the fact that the elastic force of the elastic contact piece 3 changes (decreases) only slightly after re-insertion after insertion.
[0040]
That is, by the setting process, the elastic contact piece 3 is plastically deformed in the direction of deflection by S (mm) (comparison between the positions 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 occurrence of the twist (excessive bending) can be suppressed to a small level.
[0041]
These are none other than the elastic contact piece 3 being brought into contact with the tab-like contact portion 7 within the elastic proportional limit. After the setting process as shown in FIG. 6, the lines 9 and 14 are inclined linearly (proportional). It is clear from that.
[0042]
In FIG. 6, T is a minimum tab thickness (a spring gap when a male terminal having a minimum tab thickness is inserted), G is a spring gap when the elastic contact piece 3 is in contact with the stop protrusion 11, and J is The excess deflection amount (GT) is shown. These values are the same for the elastic contact piece that is not set and the elastic contact piece 3 that is set. That is, the product spring gap B after the setting process includes a bending allowance A for obtaining a necessary contact load with respect to the tab-like contact portion 7 as described in FIG.
[0043]
7 to 10 show one embodiment of a specific method of the setting process.
[0044]
In the state where a plurality of terminals 1 'are deployed side by side as shown in FIG. 7 (a state where a plurality of terminals 1' are punched in parallel from one conductive metal plate), the elastic contact pieces 3 'of the terminals 1' one by one. Setting processing is performed by bending and deforming with the molding die 15.
[0045]
In FIG. 7, the elastic contact piece 3 ′ extends forward from the front end of the top wall 10 ′ and continues to the front chain band 16 in the orthogonal direction. The top wall 10 ′ continues to the side wall 17 ′, the side wall 17 ′ continues to the bottom wall 5 ′, the bottom wall 5 ′ passes through the base plate part 18, continues to the crimping pieces 19, 20 of the wire connection part 21, and the wire connection part 21. Is connected to the rear chain band 23 in the orthogonal direction via the connecting piece 22. The chain strips 16 and 23 are carriers for sending the terminals 1 after bending to an automatic crimping machine (not shown), and are cut and discarded simultaneously with the crimping of the electric wires (not shown).
[0046]
The molding die 15 is positioned above the top wall 10 'and supports a substantially rectangular piece 24 that can be raised and lowered to set the elastic contact piece 3', and supports the piece 24 so that it can be raised and lowered. It includes a pressing die 25 that holds the entire portion 2 ′ and a primary working die 26 that primarily bends the elastic contact piece 3 ′.
[0047]
As shown in FIG. 8, first, the portion of the terminal 1 ′ except the elastic contact piece 3 ′ is pressed against the lower die by the upper pressing die 25, and the primary working die 26 is lifted (the upper inclined surface 27 is in elastic contact). The elastic contact piece 3 ′ is vertically raised and molded by lifting the piece 3 ′, and then the elastic contact piece 3 ′ is bent in the folding direction by the forward movement of the primary working die 26. The distal end portion 28 of the pressing die 25 is formed so as to protrude in a substantially wedge shape, and the elastic contact piece 3 ′ is bent along the inclined upper surface 28 a of the distal end portion 28. The primary working die 26 has a groove 30 that allows the elastic contact piece 3 ′ to be bent by allowing the wedge-shaped tip portion 28 and the bent portion 29 of the elastic contact piece 3 ′ to enter.
[0048]
Next, as shown in FIG. 9, the first piece mold 31 descends and presses the front part of the elastic contact piece 3 ′ in the vicinity of the bending part 29 in the bending direction. The free end (rear end) 12 of the elastic contact piece 3 ′ is close to the top wall 10 ′. The first piece 31 has a tip surface 32 that is tapered and narrow, and is slightly inclined. The tip surface 32 presses the front half of the elastic contact piece 3 ′ toward the top wall 10 ′. The steps up to here are the same as the conventional steps, and the processing before the setting in FIG. 3 is completed in the steps of FIGS.
[0049]
Next, the elastic contact piece 3 is set using the second piece mold 24 as shown in FIGS. The second piece type 24 is provided to be movable up and down instead of the first piece type 31 (FIG. 9), and has a horizontal pressing surface 33 at the tip. The pressing surface 33 has a substantially inverted V-shaped taper corresponding to the elastic contact piece 3 ′ curved in the width direction as shown in FIG. The contact portion of the elastic contact piece 3 ′ is pressed by the pressing surface 33.
[0050]
The central portion of the elastic contact piece 3 is close to the stop protrusion 11, and the free end 12 of the elastic contact piece 3 is in contact with the top wall 10 '. Thereby, 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 mold 24 is raised, the resilient contact pieces 3 are restored in the opposite direction deflection. Thereafter, the side walls 17 ′, the top wall 10 ′, and the electric wire connecting portion 21 are bent and molded with another molding die to obtain the terminal 1 in the product state of FIG.
[0051]
In the above embodiment, an example in which the female terminal 1 having the box-shaped electric contact portion 2 is used has been described. However, as described in the prior art, the bottom wall 5 is opened to form the elastic contact piece. The terminal manufacturing method of the present invention can also be applied to a structure in which 3 is exposed (protruded) to the outside. Further, 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 protrusion 11. The elastic contact piece 3 may be provided not on the top wall 10 but on the bottom wall 5 or the side wall 17, that is, on any wall portion of the electrical contact portion 2. The elastic contact piece 3 may be formed separately from the wall portion of the electrical contact portion 2.
[0052]
Moreover, it is also possible to raise the elastic proportional limit of the elastic contact piece 3 by carrying out the low temperature annealing of the elastic contact piece 3, ie, the electric contact part 2 whole, after the said setting process.
[0053]
【The invention's effect】
As described above, according to the first aspect of the present invention, or to due to such twisting of the resilient contact piece of the sheet, i.e., from a significant reduction in the spring force is prevented, for example, the resilient contact upon insertion of the mating male terminal Even when the mating male terminal is reinserted after the pieces have been squeezed, the contact pressure is ensured satisfactorily and the reliability of electrical connection between the terminals is improved. This effect is also applicable when inserting the mating male terminal beyond the elastic limit in normal use.For example, even if the thickness of the mating male terminal becomes thicker than usual, it can be tolerated to some extent, thereby Yield is improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal 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 longitudinal sectional view showing a state at the time of setting in the method for manufacturing a terminal of the present invention.
FIG. 3 is a longitudinal sectional view showing a state before the terminal is similarly set.
FIG. 4 is a longitudinal sectional view showing a state where the elastic contact piece of the terminal is similarly bent to the maximum.
FIG. 5 is a load-deflection diagram showing a state before and after a terminal setting process.
FIG. 6 is a load-deflection diagram showing a comparison of the presence / absence of terminal setting.
FIG. 7 is a plan view showing an embodiment of a method for molding a terminal.
FIG. 8 is a side view of the main part showing the primary bending state of the elastic contact piece of the terminal.
FIG. 9 is a side view of the main part showing the secondary bending state of the elastic contact piece.
10A is a side view of a main part showing a state during setting of an elastic contact piece, 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 longitudinal sectional view showing an electrical contact portion of an existing terminal.
FIG. 13 is a load-deflection diagram that similarly shows the problems of the existing terminals.
[Explanation of symbols]
1 Terminal 3 Elastic contact piece (elastic contact part)
7 Tab-like contact part A of the mating terminal A displacement amount B to obtain the required contact load B Spring gap after pressing C Spring back amount D Spring clearance when pressing E Displacement amount necessary to reach the maximum spring load F Before pressing Spring gap G Maximum spring gap T Plate of mating terminal (male tab thickness)
Δx margin

Claims (1)

By pressing the elastic contact piece in the electrical contact portion of the female terminal in the bending direction, an initial plastic deformation is generated in the elastic contact piece, and the elastic limit of each bending of the elastic contact piece is stabilized. A manufacturing method comprising:
The thickness of the tab contact portion of the mating male terminal is T, the displacement amount of the elastic contact piece for obtaining the required contact load is A, and the spring back amount of the elastic contact piece, that is, the maximum spring load before pressing is generated. The difference between the amount of displacement at the point and the initial amount of plastic deformation after pressing is C, and the maximum spring load, that is, the free end portion of the elastic contact piece is brought into contact with the wall portion on the contact piece bending side of the electric contact portion. When the amount of displacement of the elastic contact piece required to reach the maximum load when the elastic contact piece is pressed in the state of
First, the spring gap F is elastic so that the size of the (T-A + C-E ) between the pressing process prior to the resilient contact piece and virtual contact piece deflection opposite wall portion of the electrical contact portion Bending the contact piece, and then pressing and displacing the elastic contact piece in the bending direction by the dimension E, releasing the pressure to spring back the elastic contact piece , and then the wall on the contact piece bending side of the electrical contact portion A terminal manufacturing method comprising: bending a wall portion orthogonal to the contact portion and a wall portion on the opposite side of the contact piece bending to finally obtain a spring gap having a dimension of (TA).

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