JP2009135022A - Terminal crimping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal crimping device in which a crimping piece (barrel) can be caulked surely to an electric wire. <P>SOLUTION: The terminal crimping device includes an anvil to support terminal metal fittings having crimping pieces (barrels) arranged respectively erected on a curved substrate part to place the electric wire, both side edges of the substrate part, and a crimper 42 in which an arch shaped caulking part 46 is formed at an opposing part to the anvil, while the crimping piece (barrel) is pressed by the anvil and the crimper 42, so that the crimping piece (barrel) is crimped to the electric wire. The caulking part 46 of the crimper 42 includes a first circular arc face 52, a second circular arc face 54 having a smaller curvature radius than that of the first circular arc face 52, a first flat face 60 that is continued from the first circular ark face 52 to a direction crossing at right angles with the pressing direction X of the crimper, a level difference face 56 extendingly installed from the first flat face 60 along the pressing direction X, and a flat face 58 extended from the level difference face 56 to the direction crossing at right angles with the pressing direction X, continuing to the second circular arc face 54. The level difference face 56 is positioned at a place deviated from the center C of the arch shape of the caulking part 46. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a terminal crimping apparatus that crimps a terminal fitting having a pair of crimping pieces (barrels) raised on both side edges of a substrate portion to a conductor of an electric wire.

  Conventionally, as a terminal crimping device for crimping a terminal to a conductor of an electric wire, a device that presses a crimping piece of a crimping terminal with an anvil and a crimper and crimps it onto the conductor is known (for example, see Patent Document 1).

  As shown in FIG. 4, the crimp terminal 100 is a crimped and electrically connected board portion 106 by being crimped to the end of the electric wire 102 by the crimper 110 and the anvil 112 of the terminal crimping device, A rectangular tube 108 that is in contact with and electrically connected to another terminal fitting is integrally provided. The board portion 106 has a substantially arc-shaped cross section, and a pair of conductor crimping pieces 114 and 116 (wire barrel) to be crimped to the conductor 104 exposed at the end portion of the electric wire 102, and a covering end portion 103 of the electric wire 102. A pair of coated crimping pieces 120 and 122 (insulation barrels) to be crimped are provided.

  One of the pair of conductor crimping pieces 114 and 116 is a first conductor crimping piece 114 that is crimped in a state where one of the conductor crimping pieces 114 and 116 is overlapped with the periphery of the conductor 104 of the electric wire 102 housed in the board portion 106. The second conductor crimping piece 116 is crimped in a state of being overlapped with the outer periphery of the first conductor crimping piece 114.

  Further, reference is also made to FIG. The first conductor crimping piece 114 before crimping is set shorter than the second conductor crimping piece 116 by a step E, and the tip end portion 116a of the second conductor crimping piece 116 is the first conductor crimping piece 116. It protrudes from the tip 114a of 114.

  The first conductor crimping piece 114 is set to a predetermined protruding length G from the bottom surface of the substrate unit 106. The protruding length G is set to a length that allows the first conductor crimping piece 114 to buckle between the conductor 104 and the second conductor crimping piece 116 in the crimping process described later. The crimper 110 is driven up and down by a ram of a press machine (not shown), and can press the conductor crimping pieces 114 and 116 of the crimping terminal 100 placed on the anvil 102. A pair of claws 124, 126 are formed on the lower end side of the crimper 110, and the conductor crimping pieces 114, 116 of the crimp terminal 100 are added between the claws 124, 126 in cooperation with the anvil 112. A tightening groove 128 is formed.

  An introduction guide portion 128a for guiding the introduction of the conductor crimping pieces 114 and 116 is formed at the open end of the groove 128. The conductor crimping pieces 114 and 116 are connected to the introduction guide portion 128a. A pressurizing part 128b that pressurizes and tilts in directions approaching each other is formed. In addition, a curved portion 128 c that bends the second conductor crimping piece 116 and overlaps the second conductor crimping piece 116 with the first conductor crimping piece 114 is formed in the inner part of the groove 128. .

  The anvil 112 includes a pressure receiving surface 130 that is recessed in an arc shape so as to face the curved portion 128 c of the crimper 110. By mounting the substrate portion 106 on the pressure receiving surface 130, the anvil 112 cooperates with the crimper 110. The conductor crimping pieces 114 and 116 can be crimped.

  Next, the terminal crimping process will be described with reference to FIG. 5B to FIG. 5F in addition to FIG. First, as shown in FIG. 5A, the board portion 106 of the crimp terminal 100 is placed on the pressure receiving surface 130 of the anvil 112, and the conductor 104 of the covered electric wire 102 is accommodated in the board portion 106.

  Next, as shown in FIG. 5B, the crimper 110 is lowered. Thereby, the conductor crimping pieces 114 and 116 of the crimp terminal 100 are guided by the introduction guide portion 128 a of the crimper 110 and introduced into the groove 128.

  Next, as shown in FIG. 5C, when the crimper 110 is further lowered, the conductor crimping pieces 114 and 116 are tilted by the pressurizing portion 128 b of the crimper 110 in a direction in which the tip portions approach each other. At this time, since the second conductor crimping piece 116 is set longer than the first conductor crimping piece 114, first, the second conductor crimping piece 116 strikes the deepest portion of the curved portion 128 c of the crimper 110. .

  As shown in FIG. 5D, when the crimper 110 is further lowered, the second conductor crimping piece 116 is gradually bent along the curved portion 128 c of the groove 128 of the crimper 110. Further, as shown in FIG. 5 (e), when the crimper 110 is further lowered from the state of FIG. 5 (d), the first conductor crimping piece is formed on the inner peripheral surface of the curved second conductor crimping piece 116. 114 hits. Here, since the protruding length G (see FIG. 5A) of the first conductor crimping piece 114 is set to a predetermined length, the first conductor crimping piece 114 has a sufficient length. The bending allowance is ensured, and the conductor crimping piece 114 is curled.

  As shown in FIG. 5 (f), when the crimper 110 is further lowered from the state of FIG. 5 (e), the curled conductor crimping piece 114 is buckled, and the tip end portion 114a is folded in the opposite direction. A portion 114b is formed. And it crimps in the state which the 2nd conductor crimping piece 116 overlapped on the outer periphery of this folding | returning part 114b, and a crimping | compression-bonding process is completed.

  The coated crimping pieces 120 and 122 formed on the crimping terminal 100 are also crimped to the covering portion 103 of the electric wire 102 in the same manner as the conductor crimping pieces 114 and 116.

Japanese Patent No. 3064852

  However, in this type of terminal crimping apparatus, when the pair of conductor crimping pieces 114 and 116 are bent by the arc surface 128 of the crimper 110, as shown in FIG. The tip portions 114a and 116a may come into contact with each other.

  When the tips 114a and 116a of the conductor crimping pieces 114 and 116 come into contact with each other as described above, the conductor crimping pieces 114 and 116 may be buckled improperly by a subsequent caulking operation. Then, a desired bending process cannot be performed on the conductor crimping pieces 114 and 116, and the other conductor crimping piece 116 does not overlap the one conductor crimping piece 114 as shown in FIG. There is a problem that the electrical resistance and the pressure bonding strength cannot be obtained. In addition, since the manner of deformation is not constant and varies depending on the crimping process, there is a problem that the crimping process in which the electrical resistance and the crimping strength are constant cannot be performed.

  An object of the present invention is to provide a terminal crimping apparatus that can securely crimp a crimping piece (barrel) to an electric wire so that desired electrical resistance and crimping strength can be obtained. is there.

The object of the present invention is achieved by the following configurations.
(1) An anvil that supports a terminal board having a curved board portion on which an electric wire is placed and crimping pieces raised on both side edges of the board part, and a crimp piece of the terminal fitting between the anvil And a crimper having an arch-shaped crimped portion formed at a portion facing the anvil. The crimping piece is pressed by the anvil and the crimper and placed on the terminal fitting. In a terminal crimping apparatus for crimping the crimping piece to the electric wire,
The crimping portion of the crimper includes a first arc surface, a second arc surface having a smaller radius of curvature than the first arc surface, and pressing of the crimper against the crimping piece of the terminal fitting from the first arc surface. A first flat surface continuous in a direction orthogonal to the direction, a step surface extending from the first flat surface along the pressing direction, and the second surface extending from the step surface in a direction orthogonal to the pressing direction. A second flat surface continuous to the arc surface,
The first arc surface, the second arc surface, the step surface, the first flat surface and the second flat surface are arranged to form an arch shape of the caulking portion,
The terminal crimping apparatus, wherein the stepped surface is located at a position shifted from the center of the arch shape.

  According to the configuration of (1), the crimped portion has the first flat surface and the second flat surface orthogonal to the pressing direction, so that one crimping piece can be reliably guided inside the other crimping piece. it can. In addition, since the caulking portion has a step surface extending along the pressing direction from the first flat surface continuous to the first arc surface, the tip of the other crimping piece overlapping the one crimping piece is a step. The surface is restricted from moving more than necessary, and the other crimping piece can be prevented from biting into the circumferential surface of one crimping piece and scraping off the circumferential surface. Further, since the stepped surface is located so as to deviate from the center of the arch shape of the crimping portion, the other crimping piece can surely overlap with one crimping piece, and the crimping piece is securely crimped. Can do.

  According to the terminal crimping apparatus of the present invention, the crimping piece of the terminal fitting can be accurately and reliably bent and the terminal fitting can be crimped to the electric wire. Therefore, the terminal fitting crimped to the electric wire has the set electric resistance and Crimp strength can be reliably obtained.

  Hereinafter, a preferred embodiment of a terminal crimping apparatus according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a terminal crimping apparatus according to an embodiment of the present invention, FIG. 2 is a front view of a crimping portion of a crimper for coated crimping pieces, and FIG. 3 is a process diagram of a crimping operation.

  The terminal fitting 10 is formed by punching a conductive plate base material into a predetermined shape and then bending it, and insulating the end portion of the electric wire 14 from the substrate portion 12 whose bottom surface has an arcuate cross section. A pair of coated crimping pieces 18 (insulation barrel) to be crimped to the coating (hereinafter referred to as “coating part”) 16 and the conductor 20 exposed by removing the coating part 16 at the end of the wire 14 are crimped. A pair of conductor crimping pieces 22 (wire barrels) and an electrical contact portion 24 are provided. The conductor 20 is made of a bundle of a plurality of strands in the form of a stranded wire or the like.

  The terminal crimping device 30 includes an anvil 32 on which the substrate portion 12 is placed, and a crimper 34 that is disposed to face the anvil 32 and is driven to be detachable from the anvil 32. The electric wire 14 is placed on the board portion 12 placed on the anvil 32.

  A pair of conductor crimping pieces 22 and a pair of coated crimping pieces 18 are crimped inward by the lifting and lowering operation of the crimper 34, and the board portion 12 is electrically crimped to the conductor 20 and the covering portion 16 of the electric wire 14. Connected to.

  The anvil 32 includes a conductor crimping piece anvil 36 used for crimping the conductor crimping piece 22 and a coated crimping piece anvil 38 used for crimping the coated crimping piece 18. And the upper surface of the cover crimping piece anvil 38 is formed in an arc surface having the same cross-sectional shape as the bottom portion of the substrate portion 12.

  The crimper 34 includes a conductor crimping piece crimper 40 used to crimp the conductor crimping piece 22 and a coated crimping piece crimper 42 used to crimp the coated crimping piece 18. The conductor crimping piece crimper 40 and the coated crimping piece crimper 42 are formed with caulking portions 44 and 46 opened downward. The caulking portion 44 of the conductor crimping piece crimper 40 and the caulking portion 46 of the covering crimping piece crimper 42 have the same configuration although the sizes are slightly different.

  The conductor crimping piece crimper 40 and the coated crimping piece crimper 42 are integrally moved up and down by a driving means (not shown). When the conductor crimping piece crimper 40 and the coated crimping piece crimper 42 are lowered, the conductor crimping piece 22 and the coated crimping piece 18 are pressed by the crimping portions 44 and 46, respectively. Are respectively crimped, and the crimping piece 22 is crimped to the conductor 20 of the electric wire 14 and the crimping piece 18 is crimped to the covering portion 16 of the electric wire 14.

  The caulking portions 44 and 46 have the widest width at the inlet portion, and the width becomes narrower toward the back. Further, convex curved surfaces 48 and 50 are formed from the inlet portions of the caulking portions 44 and 46 to the inner portion. Hereinafter, the caulking portion 46 of the crimping crimping crimping piece 42 will be described.

  As shown in FIG. 2, the deepest portion of the caulking portion 46 includes a concave first arc surface 52 having a curvature radius Ra, and a concave second shape having a curvature radius Rb smaller than the curvature radius Ra of the first arc surface 52. An arc surface 54, a first flat surface 60 extending in a direction perpendicular to the pressing direction X and continuing from the first arc surface 52, and a step extending from the first flat surface 60 so as to hang along the pressing direction X The surface 56 includes a second flat surface 58 that extends perpendicularly from the step surface 56 and continues to the second arc surface 54. The first flat surface 60 and the second flat surface 58 extend in a direction orthogonal to the barrel pressing direction (crimper movement direction) X, and are parallel to each other.

  As described above, the first arc surface 52, the second arc surface 54, the step surface 56, the first flat surface 60, and the second flat surface 58 are arranged so as to form an arch shape of the caulking portion 46. . Further, as shown in FIG. 2, the step surface 56 is located at a position shifted from the arcuate center C of the caulking portion 46. In this embodiment, the step surface 56 is from the center C by the length L of the second flat surface. It is located on the second arc surface 54 side.

The thickness t of the cover crimping piece 18 of the terminal fitting 10, the radius of curvature Ra of the first arc surface 52, the radius of curvature Rb of the second arc surface 54, the height (step) h of the step surface 56, and the step surface 56 It is preferable that the amount of deviation L from the center C of the crimping portion is set, for example, in the relationship of the following formulas (1) to (3). By setting in this way, a stable crimped shape of the coated crimping piece 18 can be obtained and a reliable electric wire holding force can be obtained.
Ra- (1/3) .t≤Rb≤Ra-2.t (Formula 1)
(1/3) · t ≦ h ≦ 2 · t (Formula 2)
(1/3) · t ≦ L ≦ 2 · t (Formula 3)

  Here, when the radius of curvature Rb of the second arcuate surface 54 is smaller than Ra− (1/3) · t, the tips of the coated crimping pieces 18 are easily brought into contact with each other, and a stable crimped shape due to overlap is obtained. Absent. Further, if the curvature radius Rb of the second arcuate surface 54 is larger than Ra−2 · t, a gap is likely to be formed in the overlapping portion of the coated crimping piece 18, and if the gap is generated, the holding force of the electric wire 14 is reduced.

  If the height h of the step surface 56 is smaller than (1/3) · t, the tip ends of the coated crimping pieces 18 are likely to come into contact with each other, and a stable crimped shape due to overlap cannot be obtained. Further, if the height h of the step surface 56 is larger than 2 · t, a gap is likely to be formed in the overlapping portion of the coated crimping piece 18, and if the gap is generated, the holding force of the electric wire 14 is reduced.

  Further, if the deviation L of the step surface 56 is smaller than (1/3) · t, the wrapping margin is small and the holding force of the electric wire 14 is reduced. On the other hand, if the amount of deviation L of the stepped surface 56 is larger than 2 · t, the tips of the coated crimping pieces 18 are likely to come into contact with each other, and a stable crimped shape due to overlap cannot be obtained.

  Next, a caulking operation of the coated crimping piece 18 by the coated crimping piece crimper 42 will be described with reference to FIGS. In the following description, the crimped crimping piece crimper 42, the coated crimping piece anvil 38, and the coated crimping piece 18 are simply referred to as the crimper 42, the anvil 38, and the barrel 18, respectively.

  When the terminal fitting 10 is placed on the anvil 38 and the electric wire 14 is placed on the substrate portion 12 and the crimper 42 is lowered, the pair of barrels 18 enters the crimping portion 46 of the crimper 42. When the crimper 42 is further lowered, as shown in FIG. 3A, the first barrel 18a is bent by being guided by the first arc surface 52, and the second barrel 18b is guided by the second arc surface 54. Can be bent. Then, the tip of the second barrel 18 b abuts on the second flat surface 58, and the tip is guided to the right in the horizontal direction by the second flat surface 58.

  When the crimper 42 is further lowered, as shown in FIG. 3 (b), the second barrel 18b is guided inside the first barrel 18a and the front end of the first barrel 18a comes into contact with the step surface 56. Movement is restricted. Here, since the first arc surface 52 does not continue to the step surface 56 and the first flat surface 60 is formed between the first arc surface 52 and the step surface 56, the first barrel 18a and the second barrel The effect of avoiding the contact phenomenon between the tip portions of 18b is great.

  When the crimper is further lowered, as shown in FIG. 3C, the second barrel 18b advances to the inside of the first barrel 18a while being bent in the same shape as the second arcuate surface 54, and the first barrel 18a is moved to the first barrel 18a. It is bent into the same shape as the arc surface 52, and the caulking work is completed.

  In this way, the terminal fitting 10 with both the barrels 18a and 18b crimped can obtain a stable crimped shape of the barrels 18a and 18b and a reliable electric wire holding force, and ensure the desired electric resistance and crimping strength. can get.

  Further, as shown by an imaginary line in FIG. 2, when the step surface 56 is inclined at an angle θ with respect to the pressing direction X and the angle θ is about 60 degrees, the overlapping first barrel 18 a is the second one. The surface of the second barrel 18b may be scraped into the space between the circular arc surface 54 and the inner second barrel 18b, and a whisker-like flash (beard) may occur.

  However, according to the above-described embodiment, such a phenomenon can be prevented, and the first barrel 18a overlapping the second barrel 18b enters between the second barrel 18b and the second arcuate surface 54 and enters the second barrel. It does not bite into the peripheral surface of 18b and scrape off the peripheral surface. Therefore, the occurrence of beard can be prevented.

  Thus, the step surface 56 is preferably along the pressing direction X, and the angle with respect to the pressing direction X is preferably 0 degrees, but the angle θ of the step surface 56 with respect to the pressing direction X is 0 to 3 degrees. If it exists, generation | occurrence | production of a beard can be prevented.

  Further, in the above-described embodiment, the crimping of the coated crimping piece 18 by the coated crimping piece crimper 42 has been described. However, the conductor crimping piece crimper 40 has the same configuration as the coated crimping piece crimper 42, and the conductor crimping piece 22 is also the same. It is crimped in the same manner as the cover crimping piece 18. Accordingly, a stable crimped shape of the conductor crimping piece 22 can be obtained, and a reliable electric wire holding force can be obtained, and desired electric resistance and crimping strength can be reliably obtained.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the object of the present invention can be achieved.

It is a perspective view of the terminal crimping apparatus which is embodiment which concerns on this invention. It is a front view of the crimping part of the crimper for covering crimping pieces. It is process drawing of a crimping operation | work. It is a perspective view of the conventional terminal crimping apparatus. It is process drawing of the conventional crimping operation | work. It is sectional drawing of the crimping state by the conventional terminal crimping apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Terminal metal fitting 12 Board | substrate part 14 Electric wire 16 Covering part 18 Covering crimping piece 20 Conductor 22 Conductor crimping piece 24 Electrical contact part 30 Terminal crimping apparatus 32 Anvil 34 Crimper 36 Conductor crimping piece anvil 38 Covering crimping piece anvil 40 Conductor crimping piece Crimper 42 Crimper 44 for coated crimping piece, 46 Caulking portion 48, 50 Convex curved surface 52 First arc surface 54 Second arc surface 56 Step surface 58 Second flat surface 60 First flat surface

Claims (1)

A crimping piece of the terminal fitting can be pressed between the anvil supporting the terminal fitting having a curved board portion on which the electric wire is placed and a crimping piece raised on each side edge of the board portion, and the anvil. And a crimper having an arch-shaped crimped portion formed at a portion facing the anvil, the crimping piece is pressed by the anvil and the crimper, and the electric wire placed on the terminal fitting In the terminal crimping apparatus for crimping the crimping piece,
The crimping portion of the crimper includes a first arc surface, a second arc surface having a smaller radius of curvature than the first arc surface, and pressing of the crimper against the crimping piece of the terminal fitting from the first arc surface. A first flat surface continuous in a direction orthogonal to the direction, a step surface extending from the first flat surface along the pressing direction, and the second surface extending from the step surface in a direction orthogonal to the pressing direction. A second flat surface continuous to the arc surface,
The first arc surface, the second arc surface, the step surface, the first flat surface and the second flat surface are arranged to form an arch shape of the caulking portion,
The terminal crimping apparatus, wherein the stepped surface is located at a position shifted from the center of the arch shape.

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