JP2009037908A - Terminal crimping device, method of manufacturing terminal crimping electric wire, and terminal crimping electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To crimp a terminal to the end part of an electric wire at different compression rates at a plurality of places without increasing management sections in manufacture. <P>SOLUTION: The terminal crimping device for crimping a crimping part of the terminal to a conductor exposed to the end part of the electric wire is equipped with: an anvil 40 for supporting the crimping part in a mounted state; and a crimper arranged and installed capable of approaching, separating, and moving against the anvil 40. The anvil 40 has a plurality of crimping faces 42a, 42b along a longitudinal direction of the conductor which is a crimping object. The respective crimping faces 42a, 42b are formed in different levels, and bottom parts of the crimping part are deformed into respectively different embodiments. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for crimping a terminal to an electric wire.

  When crimping a terminal such as a connector terminal to the end of an electric wire, it is important to increase the adhesion between the two and to reduce the connection resistance between the two. Adhesion force refers to the force required to separate the both ends of the wire and the terminal in the pulling direction, and the connection resistance is the resistance between the terminal and the wire. Means value.

  As for the fixing force, the fixing force increases as the compression rate is gradually increased, but the fixing force tends to decrease when the compression rate exceeds a certain point.

  As for the connection resistance, the connection resistance continues to decrease as the compression ratio is gradually increased, but the connection resistance tends to increase when the compression ratio exceeds a certain point.

  The optimum point of both does not become the same compression rate, and the compression rate is different from the point that exhibits the maximum value of the fixing force and the point that exhibits the minimum value of the connection resistance.

  FIG. 17 is a diagram illustrating the relationship between the crimp height, the fixing force, and the connection resistance when a terminal is crimped to the end of the electric wire. Here, the crimp height (mm) indicates the height of the crimper relative to the anvil when the terminal is crimped by a crimping die. The smaller the crimp height, the higher the compression ratio, and the larger the crimp height, the smaller the compression ratio. A decreasing relationship is established.

  In the figure, for a plurality of crimp heights H1 to H7, a change curve C1 of an adhesion force (initial stage immediately after crimping), a change curve C2 of a connection resistance (initial stage immediately after crimping), a connection resistance (after an endurance test) ) Change curves C3 are shown respectively.

  As shown in the figure, it can be seen that when the crimp height is small (H1, H2), over-compression occurs and the fixing force becomes weak. In this case, if a force in the drawing direction is applied to the end portion of the electric wire and the terminal, the end portion of the electric wire tends to be broken and separated at the crimped portion. In addition, when the crimp height is relatively appropriate (H3 to H5), a relatively strong fixing force can be obtained. In this case, if a force in the drawing direction is applied to the end portion of the electric wire and the terminal, the electric wire tends to be broken and separated except at the crimping portion. Further, it can be seen that when the crimp height is large (H6, H7), loose crimping occurs and the fixing force becomes weak. In this case, if a force in the drawing direction is applied to the end portion of the electric wire and the terminal, the end portion of the electric wire tends to come off from the terminal and be separated.

  Also, from the figure, when the crimp height is small (H1, H2), the connection resistance is relatively large, and when the crimp height is relatively appropriate (H3 to H5), the connection resistance is relatively small. It can be seen that when the crimp height is large (H6, H7), the connection resistance tends to be relatively large.

  Therefore, if pressure bonding is performed within a moderate compression rate range (in the example of FIG. 17, the range of crimp heights H3 to H5), it is possible to achieve both a certain amount of fixing force and a certain amount of connection resistance.

  However, when examined in more detail, the compressibility of the conductor suitable for obtaining a large fixing force is different from the compressibility of the conductor suitable for obtaining a small connection resistance. For example, in the case shown in FIG. 17, the crimp height suitable for obtaining a large fixing force is H5, and the crimp height suitable for obtaining a small connection resistance is H3, which are different.

  Therefore, if the electric wire and the terminal can be pressure-bonded at a plurality of locations at different compression rates, it is possible to achieve both a high fixing force and a small connection resistance at a high level.

  For this purpose, a method is considered in which a plurality of crimpers for terminal crimping are provided and crimped at different crimp heights, that is, at different compression rates.

  However, when a plurality of such crimpers are provided, it is necessary to manage the crimp height separately for each, which is a problem in manufacturing.

  Therefore, an object of the present invention is to enable crimping at different compression rates at a plurality of locations without increasing the number of management locations when crimping a terminal to an end portion of an electric wire.

  In order to solve the above-described problem, the terminal crimping apparatus according to the first aspect includes a crimping part of a terminal having a crimping part in which a pair of crimping pieces are provided on both sides of a bottom of a conductor exposed at an end of an electric wire. A terminal crimping device for crimping the first die, the first die supporting the bottom of the crimping portion in a mounting manner, and being movable toward and away from the first die. The pair of crimping pieces of the crimping portion supported in a mounting manner on the first die is deformed inwardly by being moved close to the first die, and the mounting shape is placed on the first die. A second die for crimping the crimping portion supported by the conductor to the conductor, and the first die has a plurality of crimping surfaces along a longitudinal direction of the conductor to which the crimping portion is crimped. And each crimping surface has its bottom portion compressed so as to compress the conductor at a different compression rate. Re is intended to be deformed in a different manner.

  The terminal crimping apparatus according to the second aspect is the terminal crimping apparatus according to the first aspect, wherein the plurality of crimping surfaces are formed in a stepped manner.

  A terminal crimping apparatus according to a third aspect is the terminal crimping apparatus according to the first or second aspect, wherein the plurality of crimping surfaces are formed in different curved shapes.

  A terminal crimping apparatus according to a fourth aspect is a terminal crimping electric wire for crimping the crimping part of a terminal having a crimping part in which a pair of crimping pieces are provided on both sides of a bottom part on a conductor exposed at an end of the electric wire. A manufacturing method comprising: a step of supporting the crimping portion in a mounting manner on a first die, and disposing the conductor in the crimping portion; and a second die with respect to the first die. By moving closer, the pair of crimping pieces are deformed inward by the second die, and the conductors are compressed differently at a plurality of locations along the longitudinal direction of the conductor by the first die. A step of deforming the bottom part into different modes so as to compress at a rate, and crimping the crimping part to the conductor.

  A terminal crimping apparatus according to a fifth aspect includes: an electric wire with a conductor exposed at an end; and a terminal having a crimping portion provided with a pair of crimping pieces on both sides of the bottom, wherein the pair of crimping pieces are In addition to being deformed inwardly, the bottom portion is deformed in a different manner so that the conductor is compressed at different compression rates at a plurality of locations along the longitudinal direction of the conductor, and the crimping portion is It is crimped to the conductor.

  According to the terminal crimping apparatus according to the first aspect, the first die has a plurality of crimping surfaces along the longitudinal direction of the conductor to which the crimping part is crimped, and each of the crimping surfaces is respectively Since the bottom portions are deformed in different modes so as to compress the conductors at different compression rates, the crimping portions can be crimped at different compression rates in the longitudinal direction of the conductors. At this time, since it is only necessary to manage the distance between the first die and the second die, it is not necessary to increase the number of production management points.

  In addition, since a plurality of pressure-bonding surfaces are formed on the first die instead of a second die that requires fine surface roughness to deform a pair of pressure-bonding pieces, the processing of the plurality of pressure-bonding surfaces is also compared. Easy.

  In addition, according to the second aspect, the conductor can be deformed at different compression rates by deforming the bottom portion of the crimping portion in a stepped manner by the plurality of crimping surfaces formed in a stepped manner.

  Further, according to the third aspect, the conductor can be deformed at different compression rates by deforming the bottom of the crimping portion into a different curved shape by a plurality of crimping surfaces formed in different curved shapes. .

  According to the manufacturing method of the terminal crimped electric wire according to the fourth aspect, the pair of crimping pieces are inwardly moved by the second die by moving the second die closer to the first die. The first die is deformed and the bottom portion is deformed in a different manner so as to compress the conductor at different compression ratios at a plurality of locations along the longitudinal direction of the conductor. The crimping part can be crimped at different compression rates. At this time, since it is only necessary to manage the distance between the first die and the second die, it is not necessary to increase the number of production management points.

  In addition, the first die is deformed in different forms so as to compress the conductor at different compression rates along the longitudinal direction of the conductor, so that the processing of the first die for that purpose is performed. Is also relatively easy.

  According to the terminal crimping electric wire according to the fifth aspect, the pair of crimping pieces are deformed inward, and the conductors are compressed at different compression rates at a plurality of locations along the longitudinal direction of the conductor. Thus, the bottom part is deformed in a different manner, and the crimping part is crimped to the conductor. In addition, when crimping, by forming a plurality of crimping surfaces on the bottom die, the bottom can be processed in a different manner at a plurality of locations along the longitudinal direction of the conductor. It is only necessary to manage the distance between the two dies for crimping the parts, and it is not necessary to increase the number of production management points.

  In addition, since the bottom die may be formed with a crimping surface that deforms the bottom in different modes so as to compress the conductor at different compression rates along the longitudinal direction of the conductor. Is relatively easy to process.

  Hereinafter, a terminal crimping apparatus, a method for manufacturing a terminal crimped electric wire, and a terminal crimped electric wire according to an embodiment will be described.

  First, the terminal and electric wire before crimping will be described. FIG. 1 is a plan view showing the terminal 10 and the electric wire 20 before crimping, and FIG. 2 is a side view showing the terminal 10 and the electric wire 20 before crimping.

  The terminal 10 is formed by appropriately punching and bending a metal plate, and has a terminal connection portion 12 and a crimping portion 14.

  The terminal connection part 12 is a part provided for connection to another conductive member. More specifically, when the main terminal 10 is a connector terminal, the main terminal connecting portion 12 is a male terminal connecting portion having a substantially rectangular plate shape or pin shape, or a female having a substantially rectangular tube shape or the like. It is formed at the terminal connection. In addition, this terminal connection part 12 may be formed in the substantially annular part etc. which are connected to another electroconductive member by screwing etc. Here, an example in which the terminal connection portion 12 is formed in the female terminal connection portion will be described.

  The crimping part 14 includes a bottom part 15, a pair of covering part crimping pieces 16, and a pair of conductor crimping pieces 17.

  The bottom portion 15 is formed in an elongated plate shape, and a pair of covering portion crimping pieces 16 are provided on both side portions on the proximal end side (side on which the electric wire 20 extends), and the distal end side (terminal connection portion 12 side). ) Are provided with a pair of conductor crimping pieces 17. The crimping part 14 is a substantially U-shape in a plane substantially orthogonal to the longitudinal direction of the terminal 10 in each of a part provided with a pair of covering crimping pieces 16 and a part provided with a pair of conductor crimping pieces 17. It has a cross-sectional shape. In addition, although there exists a terminal which does not have said pair of coating | coated part crimping pieces 16, this invention is applied also to a connection with such a terminal.

  The electric wire 20 is obtained by coating a covering portion 22 such as an insulating resin around a conductor 24 such as annealed copper or aluminum. When the crimping portion 14 is crimped, a predetermined length of the covering portion 22 is peeled from the end of the electric wire 20 in advance, and the predetermined length of the conductor 24 is exposed at the end of the electric wire 20. And when crimping | crimping the crimping | compression-bonding part 14 to the edge part of the electric wire 20, while the conductor 24 exposed to the edge part of the said electric wire 20 is accommodated and arrange | positioned in a pair of conductor crimping piece 17 part in the said crimping | compression-bonding part 14, first. The end portion of the covering portion 22 of the electric wire 20 is accommodated in the pair of covering portion crimping pieces 16 in the crimping portion 14. In this state, while the pair of conductor crimping pieces 17 are deformed inward, a force that compresses the pair of conductor crimping pieces 17 in the crimping portion 14 in the vertical direction is applied, thereby exposing the portions exposed. The terminal 10 and the electric wire 20 are mechanically and electrically connected to each other. Further, in the same state, by applying a compressing force to the pair of covering portion crimping pieces 16 in the crimping portion 14 while deforming the pair of covering portion crimping pieces 16 inward, the portions are The terminal 10 and the electric wire 20 are mechanically connected by being crimped to the end of the covering portion 22.

  Next, a terminal crimping apparatus will be described. 3 is an explanatory view showing the terminal crimping device 30, FIG. 4 is a side view showing the crimper 50 of the terminal crimping device 30, FIG. 5 is a front view showing the crimper 50, and FIG. 7 is a side view showing the anvil 40, and FIG.

  The terminal crimping device 30 is a device for crimping the terminal 10 to the conductor 24 exposed at the end of the electric wire 20, and includes an anvil 40 as a first die and a crimper 50 as a second die. I have.

  The anvil 40 is mounted on a base 48 and is configured to be able to support the bottom portion 15 of the crimping portion 14 in a mounting manner.

  The crimper 50 is disposed to face the anvil 40. Here, the crimper 50 is disposed so as to be movable toward and away from the anvil 40 above the anvil 40 by an actuator 58 such as an air cylinder or a hydraulic cylinder. The crimping part 14 is supported on the anvil 40 in a mounting manner, and the crimper 50 is moved closer to the anvil 40 with the conductor 24 at the end of the electric wire 20 disposed in the crimping part 14. The portion 14 is crimped to the conductor 24.

  The shape of the pressure-bonding surfaces of the anvil 40 and the crimper 50 will be described more specifically.

  The crimper 50 is formed with a crimper-side crimping surface 52 extending in a notch groove shape from the distal end portion toward the proximal end portion, and this crimper-side crimping surface 52 faces anvil-side crimping surfaces 42a and 42b described later. (See FIGS. 4 and 5). The innermost (upper) portion of the crimper side crimping surface 52 is formed in a shape in which two arcuate circumferential surfaces that protrude upward are arranged side by side. It is formed in a shape that expands sequentially. The crimper side crimping surface 52 has substantially the same cross-sectional shape along the longitudinal direction of the conductor 24 to be disposed between the anvil 40 and the crimper 50. Then, when the crimper 50 is moved close to the anvil 40 with the crimping portion 14 mounted on the anvil 40, the pair of conductor crimping pieces 17 are in sliding contact with the crimper-side crimping surface 52 while the crimper 50 is in sliding contact. It deform | transforms so that it may curve inward along the side crimping | compression-bonding surface 52. FIG.

  Further, a plurality (two in this case) of anvil-side crimping surfaces 42a and 42b are formed along the longitudinal direction of the conductor 24 to be crimped (see FIG. 6 and FIG. 6). (See FIG. 7). Each anvil-side crimping surface 42a, 42b deforms the bottom 15 in a different manner so as to compress the conductor 24 at a different compression rate. Here, each anvil-side crimping surface 42a, 42b is formed in a shallow groove shape that is curved in an arc shape around an axis in substantially the same direction with respect to the longitudinal direction of the conductor 24 to be crimped. The anvil-side crimping surfaces 42a and 42b have different positions in the movement direction of the crimper 50, and are formed to be stepped from each other via the stepped portion. Here, the anvil side crimping surface 42 a on the distal end side of the terminal 10 to be crimped is formed at a position higher than the anvil side crimping surface 42 b on the proximal end side of the terminal 10. When the crimping portion 14 is crimped between the anvil 40 and the crimper 50, the crimping portion 14 is deformed to a greater extent on the anvil side crimping surface 42a side and deformed to a smaller extent on the anvil side crimping surface 42b side. It has become so. The anvil-side crimp surfaces 42a and 42b may have substantially the same curved surface shape or different curved surface shapes. The above-mentioned anvil side crimping surfaces 42a and 42b are formed by cutting a single member.

  Moreover, the width dimension of the anvil 40 is formed so that it may become narrow gradually toward the front end side. Thus, the anvil 40 is held with sufficient strength, and the distal end side thereof can be smoothly inserted into the inner part of the crimper side crimping surface 52 of the crimper 50.

  It should be noted that the anvil 40 and crimper 50 for crimping the covering portion correspond to the pair of covering portion crimping pieces 16 of the terminal 10 on the proximal end side of the terminal 10 to be crimped with respect to the anvil 40 and crimper 50. 62 is disposed. The anvil 60 is mounted on a base 48, and the crimper 62 is disposed so as to be movable toward and away from the anvil 60 by an actuator 58. When the crimping portion 14 is crimped to the conductor 24 between the anvil 40 and the crimper 50, the crimper 62 is also moved closer to the anvil 60, and the pair of covering portion crimping pieces 16 are deformed inward, thereby the crimping portion. 14 is crimped to the covering portion 22 of the electric wire 20.

  A method of manufacturing the terminal crimped electric wire by crimping the terminal 10 to the electric wire 20 using the terminal crimping device 30 configured as described above will be described.

  First, the terminal 10 and the electric wire 20 shown in FIGS. 1 and 2 are prepared. And the crimping | compression-bonding part 14 is mounted on the anvils 40 and 60 in the mounting state in the state which spaced apart the crimpers 50 and 62 from the anvils 40 and 60. And the edge part of the electric wire 20 is arrange | positioned in the crimping | compression-bonding part 14. FIG. At this time, the pair of conductor crimping pieces 17 of the crimping portion 14 are placed on the anvil 40, and the pair of covering crimping pieces 16 of the crimping portion 14 are placed on the anvil 60. Further, the conductor 24 exposed at the end of the electric wire 20 is disposed in the pair of conductor crimping pieces 17, and the end of the covering portion 22 is disposed in the pair of covering crimping pieces 16.

  Then, the crimpers 50 and 62 are moved closer to the anvils 40 and 60. Then, the pair of conductor crimping pieces 17 are deformed inward by the crimper 50. Moreover, the crimping | compression-bonding part 14 is each changed into a different aspect by each anvil side crimping | compression-bonding surface 42a, 42b with the compression force between the crimper 50 and the anvil 40. FIG. That is, since each anvil side crimping surface 42 a, 42 b has a stepped shape, the bottom 15 of the crimping portion 14 is deformed at different locations along the longitudinal direction of the conductor 24 with different deformation degrees. As a result, the portion of the crimping portion 14 provided with the pair of conductor crimping pieces 17 is deformed to a greater degree on the distal end side of the terminal 10, and the conductor 24 is compressed to a relatively greater degree. The conductor 24 is compressed to a relatively small degree by being deformed to a smaller degree on the side.

  As a result, the portion of the crimping portion 14 provided with the pair of conductor crimping pieces 17 is crimped to the conductor 24.

  At the same time, between the crimper 62 and the anvil 60, the pair of covering portion crimping pieces 16 of the crimping portion 14 are crimped to the covering portion 22 of the electric wire 20.

  8 is a perspective view showing a terminal crimping electric wire, FIG. 9 is a sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is a sectional view taken along line XX in FIG.

  That is, in the terminal crimping electric wire 70 manufactured as described above, the pair of conductor crimping pieces 17 of the crimping portion 14 are crimped to the conductor 24, and the pair of covering crimping pieces 16 of the crimping portion 14 are covered. Crimped to the portion 22.

  In the portion of the crimping portion 14 that is crimped to the conductor 24, the pair of conductor crimping pieces 17 are deformed inwardly so as to hold the conductor 24. Further, the bottom portion 15 is deformed in a different manner (deformation degree) so as to compress the conductor 24 at a plurality of locations (here, two locations) along the longitudinal direction of the conductor 24 at different compression rates. More specifically, the outer surface of the bottom portion 15 is stepped at a plurality of locations (here, two locations) along the longitudinal direction of the conductor 24 via the step portion 15a. The height dimension A1 of the distal end portion of the terminal 10 in the crimping portion 14 crimped to the conductor 24 is higher than the height dimension A2 of the proximal end portion of the terminal 10 in the crimping portion 14 crimped to the conductor 24. Is also getting smaller.

  That is, the compressibility of the conductor 24 is relatively large in the distal end portion of the terminal 10 in the crimp portion 14 crimped to the conductor 24, and the conductor is present in the proximal end portion of the terminal 10 in the crimp portion 14 crimped to the conductor 24. The compression ratio of 24 is relatively small. Thereby, in the former part, the compression rate of the conductor 24 is set to be relatively large so as to be suitable for obtaining a small connection resistance, and in the latter part, the compression rate of the conductor 24 is set so as to be suitable for obtaining a large fixing force. It can be set relatively small.

  In addition, since the force at the time of pulling the electric wire 20 mainly acts on the proximal end side portion of the terminal 10 in the crimping portion 14 crimped to the conductor 24, the proximal end portion is obtained with a large fixing force. It is preferable that the compression rate of the conductor 24 is set appropriately.

  According to the manufacturing method of the terminal crimping device 30 and the terminal crimping electric wire 70 configured as described above, the anvil 40 has a plurality of anvil side crimping surfaces 42 a and 42 b along the longitudinal direction of the conductor 24 to be crimped. Each anvil-side crimping surface 42a, 42b deforms the bottom 15 into a different mode (deformation degree) so as to compress the conductor 24 at a different compression rate. For this reason, a crimping | compression-bonding part can be crimped | bonded with a different compression rate in the longitudinal direction of the conductor 24. FIG. As a result, it is possible to form a compressibility point where a small connection resistance can be obtained and a compressibility point where a large sticking force can be obtained, and it is easy to achieve both a small connection resistance and a large sticking force. . At this time, since the anvil 40 is provided with a plurality of anvil-side crimping surfaces 42a and 42b, it is only necessary to manage the distance between the anvil 40 and the crimper 50 when crimping. For this reason, it is not necessary to increase the number of production management points.

  Since the plurality of anvil side crimping surfaces 42a and 42b are formed on the anvil 40 side, the processing of the plurality of anvil side crimping surfaces 42a and 42b is relatively easy. That is, the crimper side crimping surface 52 of the crimper 50 has a function of slidingly contacting the pair of conductor crimping pieces 17 and deforming them inwardly. In order to rub smoothly against the surface, a fine surface roughness is required. For this reason, it becomes difficult to form a plurality of crimping surfaces on the crimper 50 and to process them smoothly. On the other hand, since the anvil 40 only deforms the bottom portion 15 as described above, the surface roughness may be rougher than that of the crimper 50. For this reason, it is relatively easy to form a plurality of anvil-side crimp surfaces 42a and 42b on the anvil 40.

  Further, as described above, the bottom portion 15 is deformed in different modes (deformation degrees) so as to compress the conductor 24 at a plurality of locations (here, two locations) along the longitudinal direction of the conductor 24 at different compression rates. The terminal crimping electric wire 70 can be manufactured by the terminal crimping apparatus 30 and the manufacturing method, thereby producing the above-described effects.

{Modifications}
In the said embodiment, the bottom part 15 is made into a respectively different aspect so that the conductor 24 may each be deform | transformed by a different compression rate by forming the some anvil side crimping surfaces 42a and 42b provided also in the anvil 40 in steps. Although it is deformed, it is not always necessary.

  FIG. 11 is a side view showing the anvil 140 according to the modification, and FIG. 12 is a rear view showing the anvil 140 according to the modification.

  The anvil 140 has anvil-side crimp surfaces 142a and 142b corresponding to the anvil-side crimp surfaces 42a and 42b. Each anvil-side crimping surface 142a, 142b is formed in a shallow groove shape that curves in an arc around the axis in substantially the same direction with respect to the longitudinal direction of the conductor 24 to be crimped. Moreover, each anvil side crimping surface 142a, 142b is formed in a respectively different curved surface shape. More specifically, each anvil side crimping surface 142a, 142b is formed to have a different curvature radius. Here, the radius of curvature of the anvil side crimping surface 142a on the distal end side of the terminal 10 to be crimped is smaller than the radius of curvature of the anvil side crimping surface 142b on the proximal end side of the terminal 10 to be crimped. Thereby, the crimping | compression-bonding part 14 is deform | transformed by the larger extent by the anvil side crimping surface 142a side, and deform | transformed by the smaller extent by the anvil side crimping surface 142b side.

  In the present modification, the anvil-side crimp surfaces 142a and 142b are connected to each other without a step along the longitudinal direction of the conductor 24 at a substantially central portion in the width direction. This configuration has an advantage of suppressing the positional deviation in the vertical direction of the crimping portion when crimping. But each anvil side crimping | compression-bonding surface 142a, 142b may be uneven in the width direction substantially center part.

  13 is a side view showing a terminal crimping electric wire 170 according to this modification, FIG. 14 is a perspective view showing the terminal crimping electric wire 170, and FIG. 15 is a sectional view taken along line XV-XV in FIG. 16 is a cross-sectional view taken along line XVI-XVI of FIG.

  That is, in the terminal crimped electric wire 170 manufactured as described above, the bottom 15 compresses the conductor 24 at a plurality of locations (here, two locations) along the longitudinal direction of the conductor 24 at different compression rates. They are deformed with different radii of curvature. More specifically, the curvature radius of the tip side portion of the terminal 10 in the bottom portion 15 of the crimping portion 14 crimped to the conductor 24 is the base end side portion of the terminal 10 in the bottom portion of the crimping portion 14 crimped to the conductor 24. It is smaller than the radius of curvature. At the substantially central portion in the width direction of the bottom portion 15, the bottom portion 15 is continuously connected without any difference in level, and the difference in the radius of curvature appears as a step 170 a on both sides thereof. Note that the height dimensions A3 and A4 in both portions in FIGS. 15 and 16 are substantially the same.

  Such a modification can also provide the same operational effects as the above embodiment.

  In other words, the plurality of crimping surfaces formed on the anvil 40 may have any shape that deforms the bottom portion 15 into different modes so as to compress the conductor 24 at different compression rates.

It is a top view which shows the terminal and electric wire before crimping. It is a side view which shows the terminal and electric wire before crimping. It is explanatory drawing which shows the terminal crimping apparatus which concerns on embodiment. It is a side view which shows the crimper of the terminal crimping apparatus same as the above. It is a front view which shows the crimper of a terminal crimping apparatus same as the above. It is a side view which shows the anvil of a terminal crimping apparatus same as the above. It is a rear view which shows the anvil of a terminal crimping apparatus same as the above. It is a perspective view which shows a terminal crimping electric wire. It is the IX-IX sectional view taken on the line of FIG. It is the XX sectional view taken on the line of FIG. It is a side view which shows the anvil which concerns on a modification. It is a rear view which shows the anvil which concerns on a modification. It is a side view which shows the terminal crimping electric wire which concerns on a modification. It is a perspective view which shows the terminal crimping electric wire which concerns on a modification. It is the XV-XV sectional view taken on the line of FIG. It is the XVI-XVI sectional view taken on the line of FIG. It is a figure which illustrates the relationship between a crimp height, fixing force, and connection resistance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Terminal 14 Crimping part 15 Bottom part 17 Conductor crimping piece 20 Electric wire 22 Conductor 24 Covering part 30 Terminal crimping device 40 Anvil 42a, 42b Anvil side crimping surface 50 Crimper 70 Terminal crimping electric wire 140 Anvil 142a, 142b Anvil side crimping surface 170 Terminal crimping electric wire

Claims (5)

A terminal crimping device for crimping the crimping part of a terminal having a crimping part in which a pair of crimping pieces are provided on both sides of a bottom part on a conductor exposed at an end of an electric wire,
A first die for supporting the bottom of the crimping portion in a mounting manner;
The pair of pressure-bonding portions that are disposed so as to be movable toward and away from the first die, and are supported on the first die so as to be placed on the first die by moving closer to the first die. A second die for crimping the crimping portion supported in a mounted manner on the first die to the conductor so as to deform the crimping piece inwardly;
With
The first die has a plurality of crimp surfaces along a longitudinal direction of the conductor to which the crimp portion is crimped, and each of the crimp surfaces compresses the conductor at a different compression rate. A terminal crimping device that deforms the different parts in different ways. The terminal crimping device according to claim 1,
The terminal crimping apparatus, wherein the plurality of crimping surfaces are formed in steps of each other. The terminal crimping device according to claim 1 or 2,
The terminal crimping device, wherein the plurality of crimping surfaces are formed in different curved shapes. A method of manufacturing a terminal crimped electric wire for crimping the crimped portion of a terminal having a crimped portion provided with a pair of crimped pieces on both sides of the bottom on the conductor exposed at the end of the wire,
Supporting the crimping part in a mounting manner on the first die and disposing the conductor in the crimping part;
By moving the second die closer to the first die, the pair of crimping pieces are deformed inward by the second die, and the longitudinal direction of the conductor by the first die. A step of deforming the bottom portion into a different manner so as to compress the conductor at different compression rates at a plurality of locations along the crimping portion, and crimping the crimp portion to the conductor;
The manufacturing method of the terminal crimping electric wire provided with. An electric wire with a conductor exposed at the end, and
A terminal having a crimping portion provided with a pair of crimping pieces on both sides of the bottom;
With
The pair of crimping pieces are deformed inward, and the bottom portions are deformed in different manners so that the conductors are compressed at different compression rates at a plurality of locations along the longitudinal direction of the conductor. A terminal crimping electric wire in which the crimping portion is crimped to the conductor.

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