JP2001183251A - Measurement of insulation displacement contact load of insulation displacement contact terminal and quality determination of insulation displacement contact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure insulation displacement contact load and with good accuracy. SOLUTION: Load cells 5 for measuring load applied to right and left side walls 42R, 42L of a terminal 40 are disposed on both sides in the cross direction of the terminal 40, thereby individually measuring load FR, FL applied to the right and left side walls 42R, 42L of the insulation displacement contact terminal 40 simultaneously at each point of time of insulation displacement contact process, which are summed to be taken as the insulation displacement contact load applied to the terminal 40. Thus, accurate insulation displacement contact load can be obtained, and when the value of offset load obtained from the above is large, it can be detected that insulation displacement contact is offset to one of the right and left side walls 42R, 42L. When the dimensional specifications of the terminal 40 as a measured object are varied, the load cells 5 are moved to new measurement positions to instantaneously cope with the case by moving the load cells 5 horizontally and vertically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the measurement of a load applied to a terminal when an electric wire is connected to a terminal in the manufacture of a wire harness for an automobile and the like, and to the judgment of the quality of the pressure connection based on the measurement.

[0002]

2. Description of the Related Art Automobile wire harnesses include, for example,
As shown in FIG. 13, electric wires 50 in which a conductor 51 is insulated and covered with a resin 52 are arranged in parallel, and a connector 30 is connected to an appropriate position in a length direction and a width direction thereof. It is covered. The wire 5
As a means for connecting the connector 0 to the connector 30, the pressure connection (hereinafter simply referred to as pressure connection) shown in FIGS. 14 and 15 is widely adopted from the viewpoint of workability.

[0003] As shown in the figure, this pressure welding is performed by each electric wire 50.
(Pressing blade) 60 corresponding to the above is lowered by an elevating mechanism (not shown), and these electric wires 50 are pressed into the slots 41 of the press-connecting terminal 40 of the connector by the lower surface (pressing surface) of the die 60. Due to the spring back of the side wall 42 of the slot 41 which is deformed, the portion is sandwiched and connected to the terminal 40. In this press-fitting, the coating resin 52 of the electric wire 50 is peeled off by friction with the side wall 42 of the slot. ,
The conductor 51 in the coating resin 52 comes into contact with the side wall 42 to enable electrical conduction between the conductor 51 and the press contact terminal 40.

[0004]

At the time of the above pressure contact, a load (pressure contact load) from the mold 60 is applied to the side wall 42 of the terminal via the electric wire 50. If the load is excessive, If the terminal 40 is subjected to abnormal deformation or loss, or if the terminal 40 is mounted in the cavity of the connector, the side wall of the cavity may be bent,
In severe cases, the product may be broken or defective.

Therefore, it is necessary to monitor the pressure contact load at the stage of trial production of the terminal. An object of the present invention is to make it possible to accurately and accurately measure the pressure contact load applied to the terminal. .

[0006]

In order to solve the above-mentioned problems, the present invention is to simultaneously measure the loads applied to the left and right side walls of the press contact terminal at each point of the press contact process.

Conventionally, as shown in FIG.
0 pressing force is applied to the right and left side walls 42 _R , 42 of the slot 41.
_L is measured for only one of them, for example, as shown in FIG.
As shown in FIG. 6B, the measured value F _R on the right side of the figure was merely represented as the press-contact load of the terminal 40. This cannot be said to be an accurate pressing load.

Further, in this case, it is impossible to detect a defective state in which the electric wire 50 is eccentrically pressed to the right side from the width center of the slot 41 as shown in FIG.

Therefore, as shown in FIG.
Side wall 42_R, 42_LPressure load F applied to_R, F_LThe same
Sometimes these are measured individually and the sum of these is
If it were a load, it would be an accurate measurement. Also measured individually
Left and right pressure welding load F_R, F _LAs a result, both F_R, F_L
If the values of are significantly different, (b)
Can detect the occurrence of such defects
You.

At the time of the measurement, it is preferable to initialize (zero reset) the measurement scale of the measuring means after placing the press contact terminal at the press contact position and before performing the press contact. Since the upper dimension crossing is included, and the degree of opening of the left and right side walls varies, if the measurement is performed without initializing the measurement scale for each terminal, the measured value is only the pure pressure contact load of the terminal side wall. Rather, the values are incorrect because of the influence of the variation in the "opening degree" of the side wall of each terminal.

For example, when the opening degree is larger than a certain reference terminal, the value becomes larger than the actual value, and when the opening degree is smaller, the value becomes smaller.

Therefore, the scale of the measuring means is initialized when the terminal is placed at the pressure contact position, so that the influence of the variation in the degree of opening of the side wall at the time of manufacturing the terminal is reduced, and the net pressure contact load is reduced. And make the measurements accurate.

If the absolute value of the difference between the loads applied to the left and right side walls at each of the above points obtained by such a measuring method is taken, it becomes an eccentric load. can do.

That is, as shown in FIG. 16 (b), when the electric wire 50 is pressed eccentrically to one side (right side in the figure) from the center of the width of the slot 41, this offset load | F _R -F _{Since L} | is detected, such a defect can be immediately detected.

Further, in the present invention, the temporal change of the press-contact load applied to the press-contact terminal obtained by the above-mentioned measuring method is compared in advance with a reference waveform obtained by the same method from a non-defective press-contact terminal. That is, the pass / fail is determined.

In this case, the quality of the pressure welding can be determined simultaneously with the measurement, so that the efficiency is high.

As an apparatus for performing the above-mentioned measuring method or pass / fail judgment method, the present invention provides a base on which a mounting portion for the terminal is provided, and the mounting portion on the both sides in the width direction of the terminal of the mounting portion. Measuring means for measuring the load applied to each side wall of the terminal was provided on the table.

At this time, it is preferable that the measuring means can be moved horizontally and vertically, so that the specification of the terminal to be measured changes and the optimum measuring position on the terminal side changes. By moving the measuring means to the new measuring position, it is possible to respond immediately.

In order to move the measuring means in the vertical direction, an elevating body which can be moved only in the up and down direction is placed on a horizontal moving body having an inclined upper surface, and the measurement is carried out on the elevating body. Means may be provided so that the horizontal moving body is moved horizontally.

With this configuration, when the measuring means is moved in the (vertical direction), the pressure contact load is received on the surfaces (inclined surfaces) when receiving the pressure contact, so that the load is dispersed.
The table does not bend and the terminal is firmly fixed with the terminal expanding force, so that highly accurate measurement can be performed.

In order to lock the movement of the measuring means, an inclined surface connection is formed between the moving portion and the stopper such that the inclined surface intersects with the moving direction of the moving portion, and the inclined surface of the stopper is formed. In such a case, it is possible to relatively press down the inclined surface of the moving portion, and in this case, also in this case, when the movement of the measuring means is locked, when receiving pressure contact, the load is reduced. Since the moving body is received on the surfaces (between the inclined surfaces), the moving body is firmly fixed against the impact and the pressing load received at the time of pressing, so that highly accurate measurement can be performed.

One of the preferable device configurations is such that the terminals are mounted on terminal mounting portions of the above-mentioned device via terminal pallets, and terminal positioning means is provided on the surface of the pallets. Then, the terminal can be securely fixed, so that the press-contact operation and the measurement operation can be performed accurately, and highly accurate measurement and quality judgment can be performed.

Further, the terminal can be mounted on the terminal pallet together with the carrier, and fixing means for detachably fixing the terminal to the pallet at the carrier can be provided. By doing so, the terminals can be more securely fixed, so that more accurate measurement and pass / fail judgment can be performed.

It is preferable that the terminal pallet is detachable from the base, and the positioning with respect to the base is performed by positioning pins provided on the base. Since the pallets can be easily positioned, if pallets corresponding to the terminals of each dimensional specification are prepared in advance, even if the specifications of the terminals change, they can be replaced immediately.

[0025]

Embodiments of the present invention will be described below. The apparatus of this embodiment shown in FIG. 1 measures the pressure load applied to the terminal at the time of pressure welding, and also determines the quality of the pressure welding by using the pressure load as a determination factor. In this apparatus, as shown in the figure, a terminal mounting table 2 is provided in the center of a base pallet 1 which is provided with handles 1a on both sides and is portable. In the center of the upper surface of the mounting table 2, a rectangular terminal pallet 3 on which the terminals 40 are directly mounted.
However, it is detachably fixed as described later.

On the upper surface of the terminal pallet 3, FIG.
As shown in (a), a groove 3a for positioning the terminal 40 in the width direction is provided, and the groove width is slightly larger than the width of the terminal 40. The terminal 40 is fitted into the groove 3a and stands upright on the pallet 3.

In order to position the terminal 40 in the longitudinal direction, a ridge 3b is provided in the middle of the groove 3a in the longitudinal direction so as to hit the head of the terminal 40.

Further, the terminal 40 is placed on the upper surface of the pallet 3 together with the terminal hoop carrier 40c, and the terminal 40 is pressed by the clamp 4 by pressing the portion of the carrier 40c with the clamp 4 so that the terminal 40 does not move during pressure contact. Is fixed. The clamp 4 is provided on the pallet 3 on the near side in the drawing.

As described above, the terminal 40 is connected to the terminal pallet 3
It is positioned above by the groove 3a and the ridge 3b, and is fixed by the clamp 4. However, when the specification of the terminal 40 changes, the mounting table 2 is attached to the mounting table 2 so that the pallet 3 can be immediately replaced. As shown in FIG. 2 (b), a positioning pin 2p is provided, and correspondingly, a positioning hole 3h is provided on the pallet 3 side for inserting the positioning pin 2p for positioning. .

The positional relationship between the positioning holes 3h of the pallet 3 and the grooves 3a and the ridges 3b differs depending on the type of the terminal 40.
Pallet 3 with its positioning pins 2p and positioning holes 3h
, Each terminal 40 is always settled at the position of the reference measurement center.

Therefore, even if the specification of the terminal 40 is changed and the terminal 40 is replaced with another corresponding pallet 3,
If the positioning hole 3h of each terminal pallet 3 is placed and fixed (by screwing not shown) in accordance with the positioning pin 2p of the mounting table 2, the terminal 40 is immediately positioned at the reference measurement center. Efficient.

The arrangement for positioning the terminal 40 to be measured has been described above. The terminal pallet 1 on both sides of the terminal mounting table 2 has a symmetrical position with respect to the mounting table 2. _XY table 6 _XY is arranged.

In the present invention, since the press-contact loads applied to the left and right side walls of the terminal 40 are individually measured, the apparatus according to this embodiment includes the _XY table _6XY and the mounting table 2 as a center. Many components are arranged symmetrically (point symmetry and line symmetry). Hereinafter, when these components are described with reference to FIG. 1, they are arranged symmetrically in order to avoid complication of sentences. Regarding the pair of elements that perform the same operation and do not distinguish between left and right by reference numerals, the same reference numerals are assigned and only the left and right elements will be described.

The XY table 6_XYIs pre-made
X table 6_XIs placed between the base pallet 1
Linear guide L₁Along the horizontal direction of the device (hereinafter,
The X direction is indicated by an arrow in FIG. 1), and the Y table
Le 6_YIs the X table 6_XOn the X
Table 6_XLinear guide L disposed between the upper surface of _Two
Along the front and rear direction (hereinafter referred to as the Y direction, and the arrow in FIG. 1)
Move to show).

X table 6_XAnd Y table 6_YIn it
Micrometer-specific drive parallel to the direction of movement
Lever 7_X, 7_YIs provided, and its driving lever 7
_X, 7_YThe pressing end of each table 6_X, 6_YAbut on the side of
are doing. This drive lever 7 _X, 7_YThe pressing end is driven
Rotate to move out of the moving lever mounting bracket
Let's make each table 6_X, 6_YThe drive lever 7_X,
7_YCan be moved in the direction in which it advances.

Further, since the X-table 6 _X and Y tables 6 _Y the driving lever 7 _X, 7 _{direction Y} presses to move in the opposite direction, for the X-table 6 _X, the base pallet 1 on the in the vicinity of the X table 6 _X along the X direction and the spring 8 _X is arranged, for Y table 6 _Y, bar 11 _Y is Y table base becomes external thread 6
Figure cavity 16 _Y is fixed to the (infra in _Y 5
See (b) too), the spring 8 _Y is incorporated in the bar 11 _Y. These springs 8 _X, 8 _Y, each table 6 _X, 6 _Y is urged in the direction opposite to the direction in which the driving lever 7 _X, 7 _Y is pressed to advance.

Thus, each of the tables 6 _X and 6 _Y can be slightly advanced and retracted in the respective moving directions by rotating the levers 7 _X and 7 _Y.

A vertical moving mechanism 6 _Z (elevating mechanism) is provided on the upper surface of the Y table 6 _{Y above} the _XY table 6 _XY.
, Which is unique to embodiments of the present invention. It refers to the lifting mechanism 6 _Z and Z table 6 _Z, the vertical direction of the Z-direction (indicated by an arrow in FIG. 1). The configuration and operation of the Z table 6 _Z, will be described with reference to FIGS.

[0039] The Z table 6 _Z, as shown in FIG, composed of two mobile 21, 26 stacked vertically.
Mobile 21 the lower is restricted between the Y table 6 at the same time _Y is placed on the upper surface of the wall along the opposite side edges in the Y direction of the Y table 6 _Y, the upper surface of the Y table 6 _Y Along the X direction (horizontal direction).

The upper surface of the lower moving body 21 is an inclined surface, and the upper moving body 26 is mounted on the inclined surface. The upper moving body 26 has an inclined surface whose bottom surface faces the inclined surface of the lower moving body 21. Both the inclined surfaces are imposed, and the upper moving body 26 is fixed to the lower moving body 21. When placed on the top, the upper surface of the upper moving body 26 is horizontal.

The upper moving body 26 is connected to the lower moving body 21.
In conjunction with rests, it is mounted on the Y table 6 _Y four erected on the upper surface of the guide shaft 27. The mounting form is such that the guide shaft 27 is fitted into a portion of a guide bush 28 fixed to the moving body 26 side.
It is possible to go up and down along.

[0042] Then, on the back of the Y table 6 _Y and screw 23 is mounted in a horizontal direction via the bracket 22, screwed to the back of the moving body 26 of the lower of the screw 23 is the Z table 6 _Z When the screw 23 is rotated, the lower moving body 26 moves horizontally along the upper surface of the Y table _6Y .

Under such a configuration, the Z table 6 _Z
Then, when the lower moving body (horizontal moving body) 21 is moved leftward by operating the screw 23 attached to the Y table 6 _Y , the upper moving body (elevating body) 26 is moved to the guide shaft 27. It rises along and descends when moved to the right.

The structure of such a vertical movement method is as follows.
Unlike the conventional lever-type structure via a rack and a pinion, when the moving (elevating and descending) is completed and stopped, the lower moving body 21 and the upper moving body 21 of the Z table 6 _Z which are directly subjected to the pressure contact load are provided. mobile 26 is not in surface wear surface (inclined surface) of the, so subjected to pressure loads in terms, not the flexes table 6 _Z is a force enough to terminal 40 is expanded,
Highly accurate measurement can be performed.

The above is the structure and operation of the Z table 6 _Z, the load cell 5 for measuring the pressure load of the terminal 40 is provided on the upper surface of the moving body 26 of the upper side of the Z table 6 _Z. The load cell 5 can be minutely moved in all directions in space by the Z table _6Z and the _XY table _6XY . Hereinafter, the moving means of the load cell 5 which combined the X · Y table 6 _XY to the Z table 6 _Z of X · Y · Z table 6 _XYZ.

[0046] Note that the Z-table 6 _Z have the dial gauge 9 is mounted, small vertical movement of the load cell 5 can be sensed. When positioning in the vertical direction, the positioning is performed according to the value of the scale indicated by the dial gauge 9. Feeler dial gauge 9 is in contact with the upper surface of the contact member provided on the back of the Y table 6 _Y.

X / Y / Z table 6 structured as described above
_When the position of the load cell 5 is determined by operating _XYZ , it is necessary to keep the tables 6 _X , 6 _Y , and 6 _Z so that the load cell 5 does not shift due to the impact at the time of pressing and the load during the pressing process. However, a lock mechanism for that purpose is provided in each of the tables 6 _X , 6 _Y , 6 _Z. Hereinafter, these will be described.

[0048] First, the X-table 6 _X and Y tables 6 _Y, as shown in FIG. 1, the table 6 _X, 6 bar 11 parallel to the respective moving directions of _{Y X,} 11 _Y is projected I have. Bar 11 _X for X table 6 _X is fixed screwed a threaded portion of the end center in the width direction of the back of the X-table 6 _X, the position in the thickness direction lower half.

On the other hand, Y table 6_YIs shown in FIG.
As shown, the aforementioned Y table 6 _YTo advance or retreat
Spring 8_YBar 11 with embedded_Y(Also in Figure 1 above
(Shown) is also used by this lock mechanism.

Each of the bars 11 _X and 11 _Y has a tapered surface 1
1 _XT and 11 _YT , and each bar 11 _X and 11 _Y
For each other, lock 1
2 _X and 11 _Y are provided. Split stop 12 _X sandwiching the bar 11 _X projecting from the side surface of the X table 6 _X is fixed to the base pallet 1, split stop 12 sandwiching the bar 11 _Y which protrudes from the side surface of the Y table 6 _{Y Y} is X It is fixed to the side of the table _6X .

Hereinafter, a lock mechanism using the bars 11 _X , 11 _Y and the slits 12 _X , 12 _Y sandwiching the bars 11 _X , 11 _Y will be described.
Figure 5 taking take those for table 6 _Y (a),
This will be described with reference to FIG. This mechanism is X table 6 _X
The same applies to

[0052] and has a respective split stop 12 _X, 12 _Y of the inner surface is the bar 11 _X, 11 _Y tapered surface 11 of the surface of the _XT, 11 _YT same taper angle of the tapered surface 12 _XT, 12 _YT. This is the opposite of the split stop 12 _Y is inserted through the screw 13 _Y is, one end of the screw 13 _Y is adapted to handle 14 _Y for rotating it. When the rotating the screw 13 _Y by rotating the handle 14 _Y, close the opposing portion of the split stop 12 _Y, so that the inner diameter of the split locking 12 _Y decreases.

The above is the Y table 6_YLock mechanism structure
And the drive lever 7_YAnd Y table 6_YMoved
When the stationary position is determined, the handle 14_YTo
Rotate and stop 12_YThe inner diameter of
12_YInner surface (tapered surface 12 _YT) At bar 11_YOn the surface of
Tapered surface 11_YTAnd tighten it.

[0054] If it is the way of such a lock, since the tapered surface 12 _YT split stop 12 _Y fixed to the side surface of the X table 6 _X is in the form of pressing the bar 11 _Y of the tapered surface 11 _YT, table 6 _Y is the tapered surface 11 _YT , 12 _Y
Supported by the _YT connection, the mold 60 (press-contact blade) does not easily move even if it receives an impact force or a press-contact load when the mold 60 (press-contact blade) first contacts the terminal 40, so that highly accurate measurement can be performed. This is as described above, the same applies for those of X table 6 _X.

[0055] On the other hand, the locking mechanism of the Z table 6 _Z, as shown in FIGS. 3 and 6, provided over the upper side of the moving body 26 and the lower side of the moving body 21 constituting the Z table 6 _Z ing.

The upper movable body 26 has a shape symmetrical with respect to the plane as viewed in the direction of movement thereof, and both sides in the width direction of the upper surface on which the load cell 5 is mounted are lower than the upper surface.
In addition, the overhanging portion 16 forms an inclined surface. Each of the right and left projecting portions 16, the handle 14 _Z is attached as shown in FIGS. 3 and 5, the lower portion of the rotation shaft of the handle 14 _Z, as shown in FIG. 5,
It has the male screw 13 _Z of smaller outer diameter than the outer diameter of the rotary shaft. The portion of the male screw 13 _Z is
The handle _14Z is attached by screwing into a screw hole 21b provided on the surface of the lower moving body 21 below the elongate hole 16a provided in the moving member 21.

Accordingly, when the handle 14 _Z is rotated, the screw portion 13 _Z bites into the lower moving body 21, and the stepped portion at the boundary of the rotation axis and the upper surface of the lower moving body 21. Between the right and left overhanging portions 1 of the upper moving body 26
The upper moving body 26 is brought into contact with the lower moving body 21 by sandwiching 6 in the thickness direction.

[0058] rotated by the locking mechanism of such a Z table 6 _Z, wherein the lower moving body 21 is horizontally moved, after the top of the moving body 26 is positioned at the appropriate height, the handle 14 _Z Then, the upper moving body 26 is fixed.
In this height adjustment, when the upper and lower mobile 21 and 26 are moved relative to an elongated hole 16a which a screw portion 13 _Z of the handle 14 _Z passes through the projecting portion 16 of the upper movable body 26 along the direction of movement since has become well, never screw portion 13 _Z from interfering with the upper movable body 26.

Thus, the load cell 5 on the X, Y, Z table 6 _XYZ can be moved to a desired position by the above-described device configuration. Even if it receives the load due to the expansion, it is securely fixed so as not to affect the measurement.

Next, the configuration of a measurement system provided with the above-described apparatus is shown in the system configuration diagram of FIG. 6, and the flow of the measurement and determination will be described with reference to the flowchart shown in FIG.

In this system, as shown in FIG. 6, left and right load cells 5 _R and 5 _L of the above apparatus are connected to respective controllers 5 _RC and 5 _LC . Each controller 5
_{The RC} and _5LC are connected to a common personal computer 71, from which instructions are issued. Further, the personal computer 71 is connected with a monitor 72 for displaying the result of the data and a printer 73 for printing out the contents of the data on a recording paper, so that the measurement result can be visually recognized.

In order to measure the pressure contact load of the terminal 40 by the above system, first, in the apparatus of FIG. 1, the terminal 40 is placed on the terminal pallet 3 with the terminal fixing clamp 4 opened. Place on. At this time, the terminal 40 is fitted into the positioning groove 3a on the upper surface of the pallet 3, and the head portion is brought into contact with the ridge 3b. Thereafter, as shown in FIG.
Is clamped and fixed on the terminal pallet 3.

Then, the X, Y, and Z tables 6 _XYZ are moved so that the press contacts of the left and right load cells 5 _R and 5 _L contact the predetermined measurement center of the terminal 40 as shown in FIG. , The load cells 5 _R and 5 _L are positioned. This completes the preparation for measurement. In this state, the electric wire 50 is connected to the terminal 4.
The metal mold 60 is routed above and the metal mold 60 is lowered and pressed. At that time, they are processed left and right load cell 5 _R, 5 _L initialization of the measurement scale of the prior lowering the mold 60 (zero reset).

As described above, even if the terminals 40 are of the same model (the same dimensional specification), the terminals 40 include dimensional intersections in the manufacture, and the left and right side walls 42 _R , 42 _L
Since there is variation in the degree of opening, if measurement is performed without initializing the measurement scale for each terminal 40, the measured value will be affected by the variation in the "degree of opening", and the measured value will be different at each end 40.
This is to prevent the net pressure load from being applied to the child because it does not result.

After the measurement scales of the left and right load cells 5 _R and 5 _L have been initialized in this way, the mold (press-contact blade) 60 is lowered to perform press-contact.

In the pressure welding process, from the moment when the electric wire 50 comes into contact with the side walls 42 _R and 42 _L of the slot 41 of the terminal 40, the mold 60 is further lowered to reach the bottom dead center and the electric wire is pressed to a predetermined pressure height. pressed to be, then, until the predetermined distance increases (not necessarily the top dead center), with a predetermined time interval, pressure load F _R exerted on each side wall at each time point, a personal measure the F _L left simultaneously Take it into the computer 71. Then, the measurement result is transmitted to the personal computer 71.
Is output to a monitor screen 72 and a printer 73 connected to the personal computer 71.

As shown in FIG. 8, the measurement results are processed by simultaneously measuring the respective press-contact loads of the right and left side walls of the terminal at each point of press-contact, and the time-dependent changes are represented by waveforms. (Process 1) and the process of adding the contents of Process 1 to represent the temporal change of the total pressure load applied to the terminal in a waveform (Process 2). The graphs of the processing 1 and the processing 2 are shown in FIGS. 9 and 10, respectively.

Further, in this embodiment, FIG.
The values of the differences between the press-contact loads F _R and F _L applied to the left and right side walls 42 _R and 42 _L of the terminal 40 as shown in FIG.

The left and right side walls 42 _R and 42 _{L of the} terminal 40
The absolute value of the difference between the pressure load F _R, F _L applied to the | F _R -F _L
Is the eccentric load applied to the terminal 40 as described above. If it is large, it can be determined that the terminal 40 is eccentrically pressed right and left from the center of the width of the slot. In the case of a non-defective product, the wire 50 is press-fitted into the center of the width of the slot 41, so that the unbalanced load is smaller than that of a defective product. The graph is shown in FIG.

The personal computer 71 has built-in reference data of the press-contact load of the terminal 40 in order to judge the quality. The reference data for this pass / fail judgment is obtained in advance by measuring the press-contact load with respect to the plurality of terminals 40 using the same device and the same method as those described above, and for the case where the press-contact is successfully performed. The data at that time is a waveform graph 75 as shown in FIG. This reference waveform 75 is not a single waveform,
As shown in FIGS. 9 to 11, the upper and lower waveforms 75u and 75b (shown by broken lines in the drawing) are spaced apart from the vertical axis representing the press-contact load. , 7
The vertical interval of 5b indicates the allowable range as a non-defective product.

That is, when the waveform of the obtained data falls within the upper and lower waveform graphs 75u and 75b, the connection body between the terminal 40 and the electric wire 50 is protruded from a non-defective product in terms of the quality of the pressure welding. If the waveform is obtained, it is regarded as defective.

[0072]

As described above, according to the present invention, the measuring means for measuring the load applied to each side wall of the terminal is provided on both sides of the terminal mounting portion in the width direction of the terminal, and each time of the pressing process is performed. At the same time, the load applied to the left and right side walls of the press contact terminal was measured, and the value of the total load obtained by adding them was regarded as the press contact load of the press contact terminal at each of the above points. A defective state in which the wire is pressed against the center of the width of the slot with a large eccentricity to one of the left and right sides could not be detected. However, such a defective state can be detected by the above-described method.

At the time of the measurement, if the scale of the measuring means is initialized after placing the press contact terminal on the pallet and before performing the press contact, an accurate measured value which does not include the preload at the time of fixing the terminal is obtained. be able to.

The temporal change of the press-contact load of the press-contact terminal obtained by the above-described measuring method, which is represented by a waveform, is compared in advance with a reference waveform obtained by the same method from a non-defective press-contact terminal to judge pass / fail. As a result, it is possible to judge the quality of the pressure welding at the same time as the measurement, which is efficient.

If the measuring means is capable of finely moving horizontally and vertically, the specification of the terminal to be measured is changed, and even if the optimum measuring position on the terminal side changes, the measuring means is moved to the new measuring position. You can move and respond immediately.

In order to move the measuring means in the vertical direction, the measuring means is provided on a table which is stacked on a moving body in the horizontal direction and which is joined by an inclined surface, and the moving means in the horizontal direction is provided. By moving the table in the horizontal direction, the table is raised and lowered along the inclined surface, so that the pressure contact load is received on the surface, so that the load is dispersed and Since the table is firmly fixed without bending, highly accurate measurement can be performed.

In order to lock the movement of the measuring means, an inclined surface connection is formed between the moving portion and the stopper such that the inclined surface intersects the moving direction of the moving portion, and the inclined surface of the stopper is formed. In this case, if the inclined surface of the moving part is relatively pressed down, the load is also received on the surface, so that the moving body is firmly fixed and highly accurate measurement can be performed.

If the terminals are mounted on the terminal mounting portion via a terminal pallet, and terminal locating means is provided on the surface of the pallet, the terminals can be securely fixed. The press-contact operation and the measurement operation can be performed accurately, and highly accurate measurement and quality judgment can be performed.

If the terminal pallet is detachable from the base and the positioning with respect to the base is performed by positioning pins provided on the base, the pallet can be easily positioned. If a pallet corresponding to the terminal of each dimensional specification is prepared, even if the specification of the terminal changes, it can respond immediately.

Further, if the terminal is placed on the terminal pallet together with the carrier and a fixing means for detachably fixing the terminal to the pallet at the carrier portion is provided, the terminal can be more securely fixed. As a result, more accurate measurement and pass / fail judgment can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an apparatus according to an embodiment.

2A is an enlarged view of a main part of FIG. 1, and FIG. 2B is a diagram illustrating a pallet positioning specification.

FIG. 3 is a perspective view showing a vertical movement mechanism of the embodiment.

FIG. 4 is a side sectional view of the same.

5A is a plan view of a lock mechanism of a Y table including a partial cross section, and FIG. 5B is a side cross sectional view of FIG. 5A including a partial cross section.

FIG. 6 shows a lock mechanism of a Z table including a partial cross section.

FIG. 7 is a system diagram of this embodiment.

FIG. 8 shows a state of measurement in this embodiment.

FIG. 9 is a flowchart showing a flow of a measurement and pass / fail judgment method according to the embodiment.

FIG. 10 is a graph showing a temporal change of a press-contact load applied to left and right side walls of the terminal.

FIG. 11 is a graph showing a temporal change of a total pressure contact load applied to a terminal.

FIG. 12 is a graph showing a temporal change of an unbalanced load applied to a terminal.

FIG. 13 is a perspective view showing a wire harness.

FIG. 14 is a perspective view showing pressure contact.

FIG. 15 is a front view showing the pressure welding.

16A shows a conventional measuring method, FIG. 16B shows a defect of the conventional measuring method, and FIG. 16C shows a measuring method of this embodiment.

[Explanation of symbols]

1 base plate 2 table 3 terminals pallet 4 clamps 5,5 _R, 5 _L load cell 6 _XYZ X · Y · Z table 6 _XY X · Y table 6 _X X Table 6 _Y Y table 6 _Z Z table 7 _X, 7 _Y , 7 _Z micrometer 8 _X , 8 _Y spring 11 _X , 11 _Y bar 11 _XT , 11 _YT bar taper surface 12 _X , 12 _Y split 12 _XT , 12 _YT split taper surface 13 _X , 13 _Y , 13 _Z screw 14 _X , 14 _Y , 14 _Z lever 16 Overhang 21 Lower moving body (horizontal moving body) 26 Upper moving body (elevating body) 30 Connector 40 Pressure contact terminal 40 c Terminal carrier 41 Slot 42 Side wall of slot 50 wire 60 mold 71 personal computer 75 reference data (waveform)

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryosuke Shioda 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi Harness Research Institute F-term (reference) 2F051 AA21 AB09 AC01 5E012 AA08 5E051 JA02 JA08 JB09

Claims (11)

[Claims] 1. A method for measuring a press-contact load applied to a press-contact terminal, wherein press-press loads applied to left and right side walls of the press-contact terminal are simultaneously measured at each time of a press-contact process. The method of measuring the pressure welding load. 2. After fixing the press contact terminal at a measurement position,
2. The measuring method according to claim 1, wherein the measuring scale of the pressing load measuring means is initialized before the pressing is performed. 3. A reference waveform previously obtained by a same method from a non-defective crimp terminal in the form of a waveform representing the temporal change of the crimp load of the crimp terminal obtained by the measuring method according to claim 1 or 2. A method for judging the quality of the press-contact by comparing the quality of the pressure-welding with the quality of the press-contact. 4. A pass / fail judgment is made using the absolute value of the difference between the press-contact loads of the left and right side walls of the terminal at each time point obtained by the measurement method according to claim 1 or 2 as a judgment factor. To determine the quality of pressure welding. 5. An apparatus for carrying out any one of the measuring method according to claim 1 and the quality determining method according to claim 3 or 4, wherein the terminal is provided on a base. An apparatus comprising a mounting portion, and measuring means for measuring a load applied to each side wall of the terminal on both sides of the mounting portion in the width direction of the terminal. 6. The apparatus according to claim 5, wherein said measuring means is movable in horizontal and vertical directions. 7. In order to move the measuring means in the vertical direction, an elevating body movable only in the up and down direction is placed on a horizontal moving body having an inclined upper surface, and the elevating body is mounted on the elevating body. 7. The apparatus according to claim 6, wherein said measuring means is provided so as to move the moving body in the horizontal direction horizontally. 8. Locking the movement of the measuring means,
An inclined surface connection is formed between the moving portion and the stopper such that the inclined surface intersects the moving direction of the moving portion, and the inclined surface of the moving portion is relatively pressed by the inclined surface of the stopper. Apparatus according to claim 6 or 7, characterized in that: 9. A terminal is mounted on a mounting portion of the terminal via a terminal pallet, and a terminal positioning means is provided on a surface of the pallet. Item 9. The apparatus according to any one of Items 5 to 8. 10. The terminal according to claim 1, wherein the terminal is mounted on the pallet together with the carrier, and fixing means for detachably fixing the terminal carrier to the terminal pallet is provided. An apparatus according to claim 9. 11. The terminal pallet is detachable from the base, and positioning of the pallet with respect to the base is performed by positioning pins provided on the base. An apparatus according to claim 9 or claim 10.