JP2008177027A - Dimension measuring method and dimension measuring device of terminal fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dimension measuring method and a dimension measuring device of a terminal fitting in which measurement of a height dimension of a coated crimping portion is stably carried out, and thereby, quality of crimping can be controlled precisely. <P>SOLUTION: The terminal fitting 40 is crimped to a coated electric wire 50 by a pair of core wire crimping members 42 crimped to a core wire 52 and a pair of coated crimping members 44 crimped to a covering 51 so that one of coated crimping member 44 may be overlapped on the other coated crimping member 44. The core wire crimping portion 43 in which the pair of core wire crimping members 42 are crimped to the core wire 52 is interposed vertically to a base plate part 41 and, by clipping the coated crimping portion 45 in which the pair of coated crimping members 44 are crimped to the covering 51 in a direction crossing at a prescribed angle or in parallel to the clipping direction of the core wire crimping portion 43, the height dimension H2 of the coated crimping portion 45 is measured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dimension measuring method and a dimension measuring apparatus for measuring a dimension of a terminal fitting crimped to a covered electric wire.

  In the crimping of the terminal metal fitting to the covered electric wire, generally, the coating of the terminal portion of the covered electric wire is peeled off, and the terminal metal fitting is crimped over the exposed core wire portion and the covered portion adjacent to the core wire portion.

  The terminal fitting has two sets of a pair of crimping pieces raised on both side edges of the substrate portion on which the covered electric wire is placed. One set is a pair of coated crimping pieces crimped to the coating part, and the other set is a pair of core crimping pieces crimped to the core wire part.

  A crimping machine that crimps a terminal fitting to a covered electric wire has a mold for crimping a crimping piece of the terminal fitting. The mold is provided with a pair of an anvil on which the substrate portion of the terminal fitting is placed and a crimper that cooperates with the anvil to crimp the crimping piece of the terminal fitting.

  The terminal fitting is pressed between the anvil and the crimper of the crimping machine, the pair of coated crimping pieces are crimped to the coating part, and the pair of core wire crimping pieces are crimped to the core wire part, Crimped.

  After crimping the terminal metal fitting to the covered electric wire, the contact resistance between the core wire and the terminal metal fitting and the adhesion force between the covered electric wire and the terminal metal fitting are evaluated. Conventionally, these evaluations were done manually by selecting samples and using an ohmmeter or tensile tester, and an automatic evaluation device that measures the resistance and tensile strength of all terminal fittings with wires was proposed. (For example, refer to Patent Document 1)

  Here, the height dimension of the core wire crimping portion formed by crimping a pair of core wire crimping pieces to the core wire portion is defined as a dimension along a direction perpendicular to the substrate portion, and the contact resistance and the fixing between the core wire and the terminal fitting are fixed. It is known to be an important indicator related to wearing power.

  Therefore, in the automatic evaluation apparatus disclosed in Patent Document 1, the resistance value and the tensile strength and the height dimension of the core wire crimping portion are measured for each terminal fitting, and both the resistance value and the tensile strength are appropriate values within the standard. The height dimension of the core wire crimping part is determined from the statistics of the measured values, and the distance between the anvil and crimper of the crimping machine is automatically adjusted so that the core wire crimping part is molded to the height dimension Has been.

JP 2000-207956 A

  In the terminal fitting, a pair of core wire crimping pieces are crimped to the core wire portion, and a pair of coated crimping pieces are crimped to the coating portion to be crimped to the coated electric wire. Therefore, the fixing force of the terminal fitting can also be obtained by a pair of coated crimping pieces crimped to the coated portion.

  Therefore, in the automatic evaluation apparatus disclosed in Patent Document 1, only a measurement and evaluation of the height dimension of the core wire crimping portion in which the pair of core wire crimping pieces is crimped to the core wire portion, The height dimension of the coated crimped part crimped to the coated part has not been measured or evaluated.

  Here, the pair of coated crimping pieces may be crimped to the coating portion so that the other coated crimped piece overlaps the other coated crimped piece. In such a case, the coated crimping portion has a cross-sectional shape that approximates a circular shape, making it difficult to determine the measurement location, and the overlap size and the non-overlap location adjacent to the overlap site are greatly different.

  Therefore, when measuring and evaluating the height dimension of the coated crimping portion, it is necessary to set a standard for determining a measurement location in common for all terminal fittings used for measurement.

  This invention is made | formed in view of the situation mentioned above, The objective is to perform the measurement of the height dimension of a covering crimping part stably, and to thereby manage the quality of crimping more correctly. An object of the present invention is to provide a dimension measuring method and a dimension measuring apparatus for a terminal fitting.

  The above object is achieved by the following (1) to (3) terminal fitting dimension measuring method and the following (4) to (6) terminal fitting dimension measuring apparatus according to the present invention.

(1) A core wire crimping portion formed by crimping a pair of core wire crimping pieces raised on both side edges of the board portion on which the covered electric wire is placed, and both side edges of the board portion. A coated crimping portion formed by crimping a pair of raised coated crimped pieces on one covered crimped piece so that the other coated crimped piece overlaps the other covered crimped piece. The core wire crimping part is clamped perpendicularly to the substrate part, and the height dimension of the covering crimping part is measured in a direction intersecting or parallel to the clamping direction of the core wire crimping part. How to measure the dimensions of terminal fittings.
(2) Positioning the terminal fitting by forming a bell mouth at at least one end of the core wire crimping portion corresponding to the axial direction of the covered electric wire, and abutting a pinching member sandwiching the core wire crimping portion on the bell mouth (1) The dimension measuring method of the terminal metal fitting as described in (1).
(3) The substrate portion is shaped to be curved in an arc shape in a cross section perpendicular to the axial direction of the covered electric wire, and a contact surface of the holding portion that holds the core wire crimping portion is in contact with the substrate portion. The terminal according to (1) or (2), wherein a concave groove that matches a curved shape is formed, and the terminal fitting is positioned by aligning the substrate portion and the concave groove of the clamping member. Manufacturing method of metal fittings.
(4) A core wire crimping portion formed by caulking a pair of core wire crimping pieces raised on both side edges of the board portion on which the covered electric wire is placed, and both side edges of the board portion. A coated crimping portion formed by crimping a pair of raised coated crimped pieces on one covered crimped piece so that the other coated crimped piece overlaps the other covered crimped piece. An apparatus for measuring a dimension of a terminal metal fitting for measuring a dimension of a coated crimping part, the clamping means for clamping the core wire crimping part of the terminal metal fitting perpendicularly to the substrate part, and the clamping direction of the core wire crimping part and a predetermined direction And a measuring means for measuring the height dimension of the coated crimping portion in a direction intersecting or parallel to the angle.
(5) The holding means is provided with an abutting portion that abuts against a bell mouth formed at at least one end of the core wire crimping portion corresponding to the axial direction of the covered electric wire (4). Device for measuring dimensions of terminal fittings as described in 1.
(6) Concave grooves that match the curved shape of the substrate portion are formed on the contact surface of the clamping means that contacts the substrate portion that is shaped to be curved in an arc shape in a cross section perpendicular to the axial direction of the covered electric wire. (4) or (5), the terminal-fitting dimension measuring apparatus according to (4).

  Since the shape of the board portion is common to all the terminal fittings used for measurement, all of the terminal fittings that hold the core crimping portion perpendicularly to the board portion are held in the same posture. Therefore, by measuring the height dimension of the coated crimping part in a direction intersecting or parallel to the clamping direction of the core crimping part with the core crimping part being sandwiched perpendicularly to the substrate part, The measurement location of the coated crimping part can be unified among all the terminal fittings used for the measurement. Thereby, the measurement of the height dimension of a covering crimping part can be performed stably, the adhering force of a terminal metal fitting can be evaluated appropriately, and the quality of crimping can be managed more accurately.

  Note that the height dimension of the core wire crimping portion is defined as a dimension along the direction perpendicular to the substrate portion, and when the core wire crimping portion is held perpendicular to the substrate portion, the height of the core wire crimping portion is also adjusted. If the dimensions are measured, man-hours can be reduced, which is preferable.

  Further, in order to prevent damage to the core wire to which the pair of core wire crimping pieces are crimped, it is generally performed to form the bell mouth by forming the end portion of the core wire crimping portion corresponding to the axial direction of the covered electric wire in a divergent manner. . Therefore, it is preferable that the terminal fitting be positioned in the axial direction of the covered electric wire if the holding means is brought into contact with the bell mouth when the core wire crimping portion is held.

  In addition, the terminal part of the terminal fitting is shaped so as to be curved in an arc shape in a cross section perpendicular to the axial direction of the covered electric wire, and the curved shape of the board part is formed on the contact surface with the substrate part of the clamping means sandwiching the core crimping part. When the matching concave groove is formed, and the substrate wire and the concave groove are aligned when the height dimension is measured by holding the core crimping portion, the terminal fitting is attached in the direction perpendicular to the axial direction of the covered electric wire. It can be positioned and is preferable.

  Hereinafter, a plurality of preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of an embodiment of a dimension measuring apparatus for a terminal fitting of the present invention, FIG. 2 is a perspective view of a terminal fitting measured by the dimension measuring apparatus of FIG. 3 is a perspective view of the terminal fitting that is crimped to the covered electric wire of FIG. 2, FIG. 4 is an enlarged plan view showing a portion surrounded by a dotted circle IV in FIG. 1, and FIG. 5 is a dotted line in FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4 and FIG. 7 is a sectional view taken along line VII-VII in FIG.

  As shown in FIG. 1, the terminal fitting dimension measuring apparatus 10 of the present embodiment includes a linear motion mechanism 12 and a rotating mechanism that constitute a clamping means for clamping a core wire crimping portion of a terminal fitting crimped to a covered electric wire. 14 and a measuring part 16 for measuring the height dimension of the covering crimping part of the terminal fitting.

  As shown in FIGS. 2 and 3, the terminal metal fitting 40 used for measurement has a core wire portion where the covering 51 of the end portion of the covered electric wire 50 is peeled off and the core wire 52 is exposed, and a covering portion adjacent thereto. It has the board | substrate part 41 mounted, and a pair of core wire crimping piece 42 and a pair of coating | coated crimping | compression-bonding piece 44 which are standing | started up at the both-sides edge of the board | substrate part 41. A pair of core crimping pieces 42 are crimped to the core wire 52 of the covered electric wire 50 placed on the substrate part 41, and a pair of sheathing crimping pieces 44 are crimped to the sheath 51 of the covered electric wire 50 placed on the board part 41. The terminal fitting 40 is crimped to the covered electric wire 50.

  As the terminal fitting, various types of terminal fittings are applicable as long as they have at least a pair of core wire crimping pieces crimped to the core wire of the covered electric wire and a pair of coated crimping pieces crimped to the coating. Is possible. The illustrated one is a female terminal fitting having a box-shaped electrical contact portion 46 at one end of the substrate portion 41, but a male terminal fitting having a tab-shaped electrical contact portion, and a joint connecting both electric wires. Terminal fittings for use can be applied.

  The terminal fitting 40 is formed by punching and bending a base material of a conductive metal plate into a predetermined shape, and a plurality of terminal fittings 40 are not connected in the form of chain terminals that are cantilevered to a strip-like carrier at a constant pitch. It is supplied to the illustrated crimping machine. In the crimping machine, the terminal fitting 40 is placed on the anvil, and the covered electric wire 50 is placed on the board portion 41. The terminal fitting 40 placed on the anvil is pressurized with the crimper, and the pair of core wire crimping pieces 42 and the pair of coated crimping pieces 44 are crimped.

  Here, the mounting surface of the anvil on which the terminal fitting 40 is mounted is formed into a concave curved surface having an arcuate contour in a cross section perpendicular to the axial direction of the covered electric wire 50, and a pair of core wire crimping pieces 42 and In the process of crimping the pair of coated crimping pieces 44, the substrate portion 41 that is in contact with the mounting surface of the anvil is curved along the shape of the mounting surface of the anvil.

  The pair of core wire crimping pieces 42 is crimped to the core wire 52 in a plane symmetry. The core wire crimping portion 43 formed by crimping the pair of core wire crimping pieces 42 to the core wire 52 has a width dimension that is perpendicular to the substrate portion 41 in a cross section perpendicular to the axial direction of the covered electric wire 50. It is molded into a flat shape that is smaller than Then, both end portions corresponding to the axial direction of the covered electric wire 50 are formed in a trumpet shape that widens toward the end, so that a so-called bell mouth is formed.

  The pair of coated crimping pieces 44 are crimped to the coating 51 such that the other coated crimped piece 44 overlaps the other coated crimped piece 44. A covered crimping portion 45 formed by crimping the pair of covered crimped pieces 44 on the covering 51 is formed in a shape approximate to a circle in a cross section perpendicular to the axial direction of the covered electric wire 50.

  The terminal fitting 40 crimped to the covered electric wire 50 by the crimping machine is cut from the carrier, and is transported to the measuring instrument 10 while holding, for example, a box-shaped electrical contact portion 46 and subjected to dimension measurement.

  Referring again to FIG. 1, the linear motion mechanism portion 12 has a linear motion shaft 18 inserted through a shaft support member 17 fixed to the base 11, and the linear motion shaft 18 is rotated around the axis. This moves forward and backward in the axial direction, and moves the moving member 19 fixed to the tip of the linear motion shaft 18 forward and backward. And the 1st clamping member 13 is being fixed to the 1st clamping member attaching part 20 formed in the edge part of the moving member 19. As shown in FIG.

  In the rotation mechanism unit 14, an arm 22 is rotatably assembled to a pivot shaft 21 fixed to the base 11. One end of the arm 22 is connected to the base 11 via a spring 23, and a second clamping member mounting portion 24 is formed at the other end, and the second clamping member 15 is connected to the second clamping member mounting portion 24. It is fixed.

  The 1st clamping member 13 and the 2nd clamping member 15 are shape | molded by the L-shape, are arrange | positioned mutually symmetrically, and mutually oppose the front-end | tip part. The core wire crimping portion 43 is disposed between the distal end portion of the first clamping member 13 and the distal end portion of the second clamping member 15.

  As shown in FIG. 4, the core wire crimping portion 43 has the tip portions of the first sandwiching member 13 such that the tip portion of either the first sandwiching member 13 or the second sandwiching member 15 abuts the substrate portion 41 vertically. And the second pinching member 15 is disposed and pinched. In the present embodiment, the distal end portion of the first clamping member 13 is disposed so as to contact the substrate portion 41 perpendicularly.

  Further, as shown in FIG. 5, both end portions of the core wire crimping portion 43 are formed in a trumpet shape that widens toward the end, and a bell mouth 47 is formed. Of the first clamping member 13 and the second clamping member 15, the first clamping member 13 that abuts on the substrate 41 and the side edge of the tip of the other second clamping member 15 abuts on the bell mouth 47, thereby The terminal fitting 40 is positioned with respect to the axial direction of the covered electric wire 50.

  Further, as shown in FIG. 6, the substrate portion 41 is formed in a convex shape in a cross section perpendicular to the axial direction of the covered electric wire 50, and is formed at the distal end portion of the first clamping member 13 that contacts the substrate portion 41. Is formed with a concave groove 25 that matches the curved shape of the substrate portion 41. The board 41 and the concave groove 25 of the first clamping member 13 are aligned, and the terminal fitting 40 is positioned in the direction orthogonal to the axial direction of the covered electric wire 50.

  The elastic force of the spring 23 acts on the arm 22 to which the second clamping member 15 is fixed, and this elastic force acts to urge the second clamping member 15 toward the first clamping member 13. To do. Therefore, the terminal metal fitting 40 has the core crimping portion 43 sandwiched between the distal end portion of the first sandwiching member 13 and the distal end portion of the second sandwiching member 15. In addition, when the core wire crimping portion 43 is sandwiched between the distal end portion of the first sandwiching member 13 and the distal end portion of the second sandwiching member 15, the height dimension H1 of the core wire crimping portion 43 is also measured. May be.

  Referring again to FIG. 1, the measuring unit 16 includes a fixed-side measuring element 26, a movable-side measuring element 27 that is arranged coaxially with the fixed-side measuring element 26 and moves back and forth in the axial direction of the fixed-side measuring element 26. It has. These fixed-side measuring element 26 and movable-side measuring element 27 constitute second measuring means for measuring the height dimension H2 (see FIG. 7) of the coated crimping part 45.

  The fixed-side measuring element 26 and the movable-side measuring element 27 have their axes intersecting a predetermined angle with the holding direction of the core wire crimping portion 43 formed by the tip portion of the first holding member 13 and the tip portion of the second holding member 15. Or in parallel with each other in the present embodiment.

  As shown in FIG. 7, the cover crimping portion 45 has the height dimension H <b> 2 between the fixed side measuring element 26 and the movable side measuring element 27 so that the movable side measuring element 27 advances and retreats in the axial direction. Measured.

  As described above, according to the terminal fitting dimension measuring apparatus 10 of the present embodiment, since the shape of the board portion 41 is common to all the terminal fittings 40 used for measurement, the core wire crimping portion 43 is used as the board portion. All of the terminal fittings 40 sandwiched perpendicularly to 41 are held in the same posture. Therefore, in a state where the core wire crimping portion 43 is vertically held with respect to the substrate portion 41, the height dimension H2 of the covering crimping portion 45 is set in a direction intersecting or parallel to the holding direction of the core wire crimping portion 41 at a predetermined angle. By measuring, the measurement location of the covering crimping part 45 can be unified among all the terminal fittings 40 used for the measurement. Thereby, the measurement of the height dimension H2 of the covering crimping part 45 can be performed stably, the fixing force of the terminal fitting 40 can be appropriately evaluated, and the quality of crimping can be managed more accurately.

  Further, in order to prevent damage to the core wire 52 to which the pair of core wire crimping pieces 42 are crimped, the end portion of the core wire crimping portion 53 corresponding to the axial direction of the covered electric wire 50 is formed so as to widen toward the end, thereby forming the bell mouth 47. When the crimping portion 43 is sandwiched, the side edge of the distal end portion of the second clamping member 15 constituting the clamping means is brought into contact with the bell mouth 47. Thereby, the terminal fitting 40 can be positioned in the axial direction of the covered electric wire 50.

  In addition, the first clamping member 13 constituting the clamping means for clamping the core wire crimping portion 43 while forming the substrate portion 41 of the terminal fitting 40 to be curved in an arc shape in a cross section perpendicular to the axial direction of the covered electric wire 50. A concave groove 25 that matches the curved shape of the substrate portion 41 is formed on the contact surface with the substrate portion 41, and the substrate portion 41 and the concave groove 25 are aligned when the core wire crimping portion 43 is sandwiched. Thereby, the terminal fitting 40 can be positioned with respect to the direction orthogonal to the axial direction of the covered electric wire 50.

  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 present invention can be achieved.

It is a top view of one Embodiment of the dimension measuring apparatus of the terminal metal fitting of the present invention. FIG. 2 is a perspective view of a terminal fitting measured by the dimension measuring apparatus of FIG. 1 and a covered electric wire to which the terminal fitting is crimped. It is a perspective view of the terminal metal fitting which shows the state crimped | bonded to the covered electric wire of FIG. It is a top view which expands and shows the part enclosed by dotted line circle IV in FIG. FIG. 5 is an enlarged plan view showing a portion surrounded by a dotted circle V in FIG. 4. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. It is a VII-VII line arrow directional cross-sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dimension measurement apparatus of terminal metal fitting 13 First clamping member (clamping means)
15 Second clamping member (clamping means)
25 Groove 26 Fixed side probe (measuring means)
27 Movable side probe (measuring means)
40 Terminal metal fitting 41 Substrate part 42 Core wire crimping piece 43 Core wire crimping part 44 Covering crimping piece 45 Covering crimping part 47 Bellmouth 50 Covered electric wire 51 Covering 52 Core wire

Claims (6)

  A core wire crimping portion formed by crimping a pair of core wire crimping pieces raised on both side edges of the board portion on which the covered electric wire is placed, and the both side edges of the board portion. A core crimping portion of a terminal fitting, comprising: a pair of sheathed crimping pieces, and a crimping portion crimped to the sheath of the sheathed electric wire so that the other sheathing crimping piece overlaps the other sheathing crimping piece Of the terminal fitting, wherein the height dimension of the covering crimping portion is measured in a direction intersecting or parallel to the clamping direction of the core crimping portion. Dimension measurement method. Forming a bell mouth on at least one end of the core wire crimping portion corresponding to the axial direction of the covered electric wire;
2. The method of measuring a dimension of a terminal fitting according to claim 1, wherein the terminal fitting is positioned by bringing a holding member for holding the core wire crimping portion into contact with the bell mouth. The substrate portion is shaped to be curved in an arc shape in a cross section perpendicular to the axial direction of the covered electric wire,
Forming a concave groove that matches the curved shape of the substrate portion on the contact surface that contacts the substrate portion of the clamping means for clamping the core crimping portion;
The method of manufacturing a terminal fitting according to claim 1 or 2, wherein the terminal fitting is positioned by aligning the substrate portion and the concave groove of the clamping member. A core wire crimping portion formed by crimping a pair of core wire crimping pieces raised on both side edges of the board portion on which the covered electric wire is placed, and the both side edges of the board portion. A coated crimping portion of a terminal fitting having a pair of coated crimped pieces crimped on a coating of the coated electric wire so that the other coated crimped piece overlaps the other coated crimped piece A terminal fitting dimension measuring device for measuring the dimensions of
Clamping means for clamping the core crimping portion of the terminal fitting perpendicularly to the substrate portion;
Measuring means for measuring the height dimension of the covering crimping part in a direction intersecting or parallel to a sandwiching direction of the core crimping part;
An apparatus for measuring the dimensions of a terminal fitting, comprising:   5. The abutting portion that abuts against a bell mouth formed at at least one end of the core wire crimping portion corresponding to the axial direction of the covered electric wire is provided in the clamping means. Device for measuring the dimensions of terminal fittings.   A concave groove that matches the curved shape of the board portion is formed on the contact surface of the clamping means that contacts the board portion that is shaped to be curved in an arc shape in a cross section perpendicular to the axial direction of the covered electric wire. The terminal fitting dimension measuring apparatus according to claim 4 or 5, wherein the terminal fitting dimension measuring apparatus according to claim 4 or 5 is provided.

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