JPH02261008A - Method of measuring dimension of terminal caulking section - Google Patents

Abstract

PURPOSE:To measure the dimension of a terminal caulking section with its inclination corrected by bringing a height measurement piece into contact with the upper part of a terminal caulking section with pressing force to make the inclination against a loading base of the terminal caulking section 0 degree and by bringing a width measurement piece into contact with the terminal caulking section with the similar pressing force. CONSTITUTION:After a terminal was fixed to a dimension measurement jig 22, a switch is turned ON. Then, a microcomputer 47 moves a piston rod 45 of an air cylinder 44 for height detector downwards and brings a height measurement piece 16 installed to a lever 43 into contact with a terminal caulking section. At this moment, even if the caulking section is inclined to a loading base 12, the force enough to make this inclination 0 degree is applied from a height measurement piece 16 to the terminal caulking section. A microcomputer 47 then drives air cylinders 36a and 36b for a width detector and presses the width detection pieces 15a and 15b to the terminal caulking section. Under this condition the information on height and width is read in.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a method for measuring the dimensions of a terminal caulked portion of a terminal fitting crimped to an electric wire end portion from which insulation coating has been removed, and in particular, to The present invention relates to a method for measuring the dimensions of a terminal caulking part, which allows height and width to be measured with high precision.

"Conventional technology" Conventionally, terminal fittings (hereinafter referred to as terminals) have been attached to the ends of electric wires.
In the process of crimping, after removing the insulation coating from the end of a wire that has been measured and cut to a predetermined length, a terminal of a predetermined size and shape is attached by crimping to the end of the wire. There is.

By the way, when connecting the core wire of an electric wire and a terminal by crimping, the connecting part must be completely electrically conductive and must have a gripping force comparable to the tensile strength of the electric wire. Must be.

That is, crimping that provides good electrical and mechanical properties is required. This is because if the crimping is incomplete, there will be a gap between the terminal and the core wire, resulting in incomplete conduction, and the gripping force will be reduced, making it easier to remove the core wire. On the other hand, if the wire is over-crimped, the cross-sectional area of the core wire decreases, making it more likely to break. In this way, when crimping a terminal to an electric wire, it is necessary to crimp it with an optimal crimping amount.

In this case, the crimping amount is generally determined by the crimping ratio expressed as a percentage of the cross-sectional area of the core wire after crimping to the cross-sectional area of the core wire before crimping, and the optimal amount is 75 to 90%. It is said that there is.

By the way, when managing this crimp amount at the production site,
As shown in FIG. 3, the height CH and the width CW at the connection portion between the core wire 2 and the terminal 3 of the electric wire 1, that is, the core wire caulking portion 4.
This method is generally used because it is relatively easy to evaluate.

Incidentally, FIG. 4 shows a sectional view taken along the line I-1 in FIG. 3.

Here, FIG. 5 is a plan view showing a dimension measuring jig to which a conventional terminal caulking portion dimension measuring method is applied, and FIG. 6 is a side view of the same device. In these figures, a clamp lever 10 for fixing the terminal crimping part 4 of the terminal 3 is a fixing clamp for fixing the terminal crimping part 4 together with the clamp lever IO. I2 is a stage (see FIG. 6) that supports the bottom surface of the terminal caulking part 4 and fixes the terminal caulking part 4 together with the clamp lever IO and the fixing clamp 11; I3;
I6 is a base for fixing the stage 12, 14a14b is a fixing block for fixing the base 13 in a predetermined position, 15a, 15b is a width measuring element for measuring the width CW of the terminal caulking part 4, This is a height measuring element for measuring the height CI of the terminal caulking portion 4. Here, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 18 is a shaft for rotatably supporting the clamp lever 1O,
I9 is a compression coil spring for pushing the clamp lever 10 upward in the drawing, 20 is a bolt that supports the compression coil spring I9 from below, and 21 is a bolt that supports the port 20 on the base 13.
This is a bolt for fixing it to the In this case, the portion of the clamp lever 10 that comes into contact with the terminal 3 is the compression coil spring I9.
The stage I2 side is biased by bolts 20 and 21. Clamp lever mentioned above - IO1 fixed clamp 1
1, stage 12, base I3, fixed bracket a-) 14a,
+4b, width measuring element 15a, 15b, height measuring element 6, bolt +7.20, 21, shaft 18, and compression coil spring 19 constitute a dimension measuring jig 22.

In the dimension measuring jig 22 configured in this way, the left end of the clamp lever IO (see FIG. 7) is pushed down, the tip of the lever 10 is separated from the stage 12, and then the space between them is After inserting the terminal 3 into the terminal 3, the operation of the crank lever 10 is released, and the terminal 3 is fixed at three points: the crank lever 10, the fixing clamp 11, and the stage 12. After the terminal 3 is fixed, the height CH of the terminal caulking portion 4 of the terminal 3 is first measured. That is, without fixing the terminal 3 to the dimension measuring jig 22 in advance, the height measuring element I6
the position when the terminal 3 is fixed to the dimension measuring jig 22, and the position when the height probe 16 is brought into contact with the terminal caulking part 4. By calculating the distance CH, the height CH of the terminal caulking portion 4 is measured.

Subsequently, after measuring the height of the terminal caulking portion 4, the width CW of the terminal caulking portion 4 is measured. That is, with the terminal 3 fixed to the dimension measuring jig 22, the width measuring elements 15a and 15b are
The width CW of the terminal crimping part 4 is measured by calculating the distance between the terminal crimping part 4 when the terminal crimping part 4 is brought into contact with the terminal crimping part 4 .

``Problem to be Solved by the Invention'' By the way, when fixing the terminal crimped part 4 using the dimension measuring jig 22 to which the above-described conventional terminal crimped part dimension measurement method is applied, as shown in FIG. There is a possibility that the caulking portion 4 is fixed at an angle with respect to the stage 12. When this happens, the height measuring element 16 and the width measuring element 15a, 15
The height CI- obtained by bringing b into contact with the terminal caulking part 4
I and width CW include measurement errors due to their slopes.

Similarly, when fixing the terminal crimp portion 4 using such a dimension measuring jig 22, as shown in FIG. may be done. When this happens, the width measuring tip 15
The width CW obtained by bringing a and 15b into contact with the terminal caulking portion 4 as shown in the figure includes a measurement error due to its inclination.

This invention was made in view of two consecutive circumstances, and an object of the present invention is to provide a method for measuring the dimensions of a terminal caulking part that can measure the height CH and width CW of the terminal caulking part 4 with high precision. There is.

``Means for Solving the Problems J'' This invention provides a mounting table on which a terminal caulking portion of a terminal fitting crimped to an end portion of an electric wire is placed, a fixed clamp that abuts on one side surface of the terminal caulking portion on an inclined plane, and The terminal caulking portion is fixed by each clamp lever that comes into contact with the other side surface with a preset clamping force on an inclined plane, and then a height measuring element is brought into contact with the upper part of the terminal caulking portion, and the terminal caulking is performed. The height of the terminal caulking portion and the measurement value obtained when the terminal caulking portion is not fixed are determined by placing a width measuring element in contact with both sides of the terminal portion and measuring values obtained at that time and each measurement value obtained when the terminal caulking portion is not fixed. In the method for measuring the dimension of a terminal caulked portion for measuring width, after the terminal caulked portion is fixed, the height measuring element is applied with a pressing force to make the inclination of the terminal caulked portion with respect to the writing table zero. The width measuring element is brought into contact with the upper part of the terminal caulking part, and then each of the width measuring elements is brought into contact with the terminal caulking part with a pressing force to make the inclination of the terminal caulking part with respect to the width measuring element zero. do.

[Operation J According to this invention, the pressing force applied to the terminal caulking portion of each of the height measuring element and the width measuring element is determined as described above, and after the height measuring element is brought into contact with the terminal caulking portion, the width By bringing the measuring tip into contact with the terminal caulking portion, even if the caulking portion is fixed at an angle with respect to the stage and the width measuring tip, the inclination is corrected to zero.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of a dimension measuring device to which a method for measuring dimensions of a terminal caulking portion according to an embodiment of the present invention is applied. In addition, in this figure, the above-mentioned figures 3 and 5
Components common to each of FIGS. 7 to 7 are designated by the same reference numerals, and their explanations will be omitted.

In this figure, 25 is a base formed in a plate shape. Reference numeral 26 denotes a jig fixing base for fixing the dimension measuring jig 22, and is attached to the substantially central portion of the base 25 on the front side in the drawing. Tightening bolts 27a and 27b are provided on the right side of the jig fixing base 26, respectively, and these bolts 27a and 27b are used to secure the height probe 16 and the width probe +5a and 15b to the predetermined positions of the terminal caulking portion 4. A dimension measuring jig 22 is fixed so as to be in contact with. 28a and 28b are holders each formed in a rectangular shape, and among these, the boulder 28a supports the spindle 30a of the width detector 29a, and the holder 28b supports the spindle 30b of the width detector 29b. It is.

A width measuring element 15a is attached to the right end of the spindle 30a, and a width measuring element 15b is attached to the left end of the spindle 30b. Reference numeral 31a31b is a ball slide formed in a substantially rectangular shape. Among these, the above-mentioned holder 28a and width detector 29a are respectively attached to the upper surface of the ball slide 31a, and the above-mentioned width detector 29a is attached to the upper surface of the ball slide 31b. A holder 28b and a width detector 29b are each attached. 3
Reference numeral 2 denotes a slide guide for guiding the ball slides 31a and 31b in the left-right direction in the drawing. 33a and 33b are stopper flanges formed in an abbreviated shape, and among these, the stopper flange 33a
The stopper flange 33b is attached to the front surface of the ball slide llb (not visible in this figure). In addition, the stopper flange 33
A rod-shaped stopper 34-a is horizontally attached to the left end of the figure a, and a stopper 34b having a similar shape is attached horizontally to the right end of the stopper flange 33b. Reference numerals 35a and 35b are L-shaped stopper receiver flanges, and among these, the stopper receiver flange 35a is a width detection air cylinder 36.
The flange 35b of the stopper receiver is attached to the left end of the upper surface of the width detection air cylinder 36b. Moreover, these stopper receivers are provided with a rod-shaped stopper receiver 37 on the upper part of each of the flanges 35a, 35b, facing the above-mentioned stoppers 34a, 34b.
A37b is attached. '' The two consecutive width detection air cylinders 36a and 36b are each formed in a rectangular shape, and among these, the width detection air cylinder 36a has a
A piston rod 38a that protrudes from its right side is built in, and the width detection air cylinder 36b has a built-in piston rod 38b that protrudes from its left side. These piston rods 38a, 38b are connected to the ball slides 3]a, 3 via stopper flanges 33a, 33b.
1b in the left-right direction in the drawing. Next, 3
9 is a height detector, 40 is a height detector 39 connected to a flange 41
42 is the spindle of the height detector 39 with the height measuring element 16 attached to its tip; 43 is the lever having one end fixed to the height measuring element 16; 44 is the height measuring element 16; The detector air cylinder 45 is a piston rod of a height detector air cylinder for vertically moving the spindle 42 of the height detector 39 via the lever 43. A microcomputer 47 includes a CPU (central processing unit), a RAM (random access memory), a ROM (read only memory), an interface circuit, etc. (not shown).

In this case, a program for controlling the CPU is written in the ROM. This microcomputer 47
reads device information constituted by the height detector 39 and the width detector 29a29b, respectively, and calculates the height CH and width CW of the terminal caulking portion 4 based on the position information.

The microcomputer 47 also uses an electromagnetic force (not shown) to apply a predetermined pressing force (hereinafter referred to as measuring force) to the terminal caulking portion 4 by the height measuring tip 16 and the width measuring tip +5a, 15b. The movement of the screws and locks 545 of the air cylinder 44 for height detection by controlling the opening and closing of the valve;
The movement of the width detection air cylinders 36a and 36b is controlled. That is, when the terminal caulking part 4 is tilted and fixed to the dimension measuring jig 22, the height measuring element 16 and the width measuring element +
This is so that the inclination can be corrected by pressing the caulking portions 5a and 5b against the same caulking portion 4.

Here, the measuring force applied to the terminal caulking portion 4 of each of the height measuring element 16 and the width measuring element 15a+5b will be explained.

First, the measuring force applied to the terminal caulking portion 4 of the height measuring element 16 will be explained.

For example, as shown in FIG. 8, the terminal caulking part 4 is held at an angle of β with respect to the stage 12 of the dimension measuring jig 22, and a clamping force F1 is applied by a clamp lever 10 and a fixed clamp 11 having an inclination angle α The relationship between the clamping force F and the reaction force F2F3 generated on the fixed clamp 11 and the stage 12 can be expressed by the following equation.

p, /sinθ,=F2/sinθ2=F3/s+n
θ3 (I) where θ1. θ2 and θ3 are F
+, is an angle indicating the direction in which Fz and F3 act, and is set as 01-π-α-β, θ2-π-α+β, and θ3-2α.

In this way, when the terminal caulking part 4 is fixed to the dimension measuring jig 22 at an angle β of 6, when the height measuring element 16 comes into contact with the caulking part 4 with the measuring force Fmh, the caulking part 4
The terminal caulking portion 4 moves in a direction in which the inclination angle β with respect to the stage I2 approaches zero. At this time, the terminal crimping part 4 and the clamp lever 1 should be moved in the direction that prevents the movement of the terminal crimping part 4.
0. When a frictional force is generated on the contact surfaces of the fixed clamp 11 and the stage 12, the sums Fy and PX of the vertical and horizontal frictional forces can be expressed as follows.

py= u +F+cos7 + u 2F2CO8
7+ u 3F3s]nβpX= μ+F+5ln7
10μ2F2SIn7 u 3F3COSβwhere, γ
−π/2−α, μ2. μ2 and μ3 are friction coefficients of 1 on the contact surfaces between the terminal caulking portion 4, the clamp lever 10, the fixed clamp 11, and the stage 12, respectively.

Then, by substituting equations (1) and (2) into equations (3) and (4) and arranging them, Py and Fx become as follows.

Therefore, if the frictional force on the contact surface between the height probe 16 and the terminal crimping part 4 is μn, then the terminal crimping part 4
The conditions for correcting the angle β of the inclination with respect to the stage 12 are: Fmh≧FY or −) μnFmh≧Fx
It can be found as (7). In this way, the measuring force applied to the terminal caulking portion 4 of the height measuring stylus I6 is determined.

Next, the measuring force applied to the terminal caulking portion 4 of each width measuring element 15a, 15b will be explained.

Now, after the height measuring element 16 comes into contact with the terminal caulking part 4 and its inclination with respect to the stage 12 is corrected, the terminal caulking part 4 contacts the width measuring element 15a, 15 as shown in FIG.
If it is fixed by the dimension measuring jig 22 and the height measuring element 16 with an inclination of δ with respect to b, then the width measuring element 15a
, +5b contact the terminal caulking portion 4 with a measuring force Pmw, the point of action of these measuring forces Fmw is a point P as shown in the figure.

Q, resulting in a shift in the front-back direction. Therefore, a couple centered on point O is generated. Due to the action of this couple, when the terminal caulking part 4 moves in the direction in which the angle δ of the inclination with respect to the width measuring elements 15a and 15b approaches zero, the same caulking part 4 moves in the direction that prevents the movement, and the height measurement If a frictional force is generated at the contact surfaces of the child I6, the clamp lever 10, and the stage 12, the sum of the moments due to these frictional forces about point 0 is M. becomes like the following formula.

Mo=μn' 4mh-(2+ Fern,
(8) Here, μn° is the coefficient of friction at the contact surface between the height measuring element 16 and the terminal caulking part 4 after the inclination of the terminal caulking part 4 with respect to the stage I2 has been corrected, and ρ is the width measuring element 15a , 15b, and L is the distance between the width probe 15a15b and the clamp lever 10. Further, Fcr is the sum of the left-right direction components of the friction force generated at the contact surfaces between the terminal caulking portion 4, the clamp lever 1O, and the stage 12. The terminal crimping part 4 and the clamp lever 10 after the inclination of the terminal crimping part 4 with respect to the stage I2 has been corrected.
The coefficient of friction of the contact surface with
If the friction coefficient at the contact surface between the surface and the stage 12 is shifted by μ3°, Fcr becomes as follows.

Fcr= (27z 3' @-II +')F+co
sα(9) Therefore, the couple Pmw due to the measuring force Fmw
-12 is the total moment M due to frictional force. If it is larger, the angle δ of the inclination of the terminal crimp portion 4 with respect to the width measuring stylus +5a, 15b can be corrected. The condition at this time is Fmw-f2≧M. (10) It can be found as follows. In this way, the width measuring stylus 15a, 15b
The measuring force applied to the terminal caulking portion 4 is determined.

As described above, by setting the clamping force F1 and the measuring forces Fmh, Fmw so as not to satisfy the expressions (7) and (10), the terminal crimping portion 4 can be Even if the terminals 15a, 15b are fixed at an angle with respect to each other, the inclination can be corrected as soon as the width measuring elements 15a, 15b contact the terminal caulking portion 4.

Therefore, accurate measurement can be performed without including errors due to the inclination.

Note that the measuring force Fmw is determined by the width detector stopper 34a,
It is also possible to adjust the force by changing the position of 34b.

Next, the operation of the dimension measuring device described above will be explained.

Now, after fixing the terminal 3 to the dimension measuring jig 22, when the measurement start switch (not shown) is turned on, the micro combi coater 47 moves the piston rod 45 of the height detector air cylinder 44 downward. Then, the height measuring element 6 attached to the lever 43 is brought into contact with the terminal caulking part 4. In this case, the measuring force Pm that satisfies the above equation (7)
Since h is applied from the height measuring tip I6 to the terminal caulking part 4,
Even if the caulking portion 4 is fixed at an angle with respect to the stage 12, this inclination is corrected to zero. Next, the microcomputer 47 brings the height measuring stylus 16 into contact with the terminal caulking portion 4, and then controls the width detector air cylinder 36a.
When moving the piston rod 38a of the width detector air cylinder 36b to the right, the piston rod 38a of the width detector air cylinder 36b
b to the left to bring the width measuring elements 15a and 15b attached to the spindles 30a and 30b into contact with the terminal crimping portion 4, respectively. In this case, since the measuring force Fmw that satisfies the above equation (10) is applied to the terminal caulking part 4 from each width measuring element 15a, 15b, the terminal caulking part 4 is inclined with respect to the width measuring element 15a, 15b to measure the dimension. Even if the jig 22 and the height measuring element 16 are fixed, the inclination is corrected to be zero. Then, the microcomputer 47 connects each width measuring tip +5a, 15b to the terminal caulking portion 4.
After contacting the height detector 39 and the width detector 29a
, 29b, and determines the height CH and width of the terminal crimp portion 4 based on these positional information and the positional information obtained from each detector 39 and 29a, 29b in the zero setting state in advance. CW is calculated.

For reference, FIG. 2 shows the results of measuring the height CH and width CW of the terminal crimp portion of a certain terminal using a dimension measuring device for five cases with different crimping conditions. As shown in this figure, it can be seen that fairly good repeatability is obtained.

In addition, in the above embodiment, the height CH of the terminal caulking portion 4
The explanation was given using the example of measuring the width CW, but the terminal 3
Of course, the dimension measuring device of this embodiment can also be applied to the measurement of the height and width of the caulked portion of the insulation coating.

``Effects of the Invention'' As explained in section 2 below, according to the method for measuring the dimensions of a terminal caulking portion of the present invention, the height measuring element is applied with a pressing force to make the inclination of the terminal caulking portion with respect to the stage zero. The width measuring element is brought into contact with the upper part of the terminal caulking part, and then the width measuring element is brought into contact with the terminal caulking part with a pressing force to make the inclination of the terminal caulking part with respect to the width measuring element zero, so that the terminal caulking is made easier. Even if the part is fixed at an angle with respect to the stage and the width measuring element, the inclination is corrected to zero.

Therefore, it is possible to measure the height and width of the terminal caulking portion with high precision.

[Brief explanation of drawings]

FIG. 1 is a perspective view, not showing the appearance, of a dimension measuring device to which a judicial measuring method for a terminal caulking portion is applied, which is an embodiment of the present invention;
Fig. 2 is a diagram showing measurement results using the same device, Fig. 3 is a perspective view showing the external appearance of the terminal fitting, Fig. 4 is a sectional view taken along line I-1 in Fig. 3, and Fig. 5 is a conventional terminal caulking section. 6 is a side view of the same jig, FIG. 7 is a sectional view taken along the line ■-■ of FIG. 5, and FIGS. 8 and 9 are
The figures are diagrams for explaining the problems of the dimension measuring jig to which the conventional terminal caulking portion dimension measuring method is applied. ■... Electric wire, 2... Core wire, 3...
Terminal fitting, 4...Terminal caulking part, IO...
... Clamp lever 11 ... Fixed clamp, 12
...Placement stand, 13...Base, +4a, +
4b...Fixed block, 15a, +5b...
...Width measuring element, 16...Height measuring element, 17...
...Bolt, I8...Shaft, 19...
Compression coil spring, 20.21... Bolt, 22
...Dimension measurement jig, 25...Base, 2
6... Jig fixing base, 27a, 27b... Tighten bolts, 28a, 2
8b... Boulder, 29a, 29b... Width detector, 30a, 30b... Spindle, 31a 31b... Pole slide, 32...
Slide guide, 33a, 33b... Stopper flange, 34
a, 34 b-stopper, 35a, 35b... Stopper receiver is flange, 36a
, 36b... Air cylinder for width detection, 37a, 3
7b Stopper receiver C, 38a, 38b Piston rod, 39... Height detector, 40...
...Bracket, 4I...Flange, 42...
・Spindle, 43... Lever 44... Air cylinder for height detection, 45...
...Piston rod.

Claims (1)

[Claims] The terminal crimping part of the terminal fitting crimped to the end of the electric wire is mounted on a stage, a fixed clamp contacts one side of the terminal crimped part with an inclined plane, and a clamp lever contacts the other side with an inclined plane. The terminal caulking part is fixed, and then a height measuring element is brought into contact with the upper part of the terminal caulking part, and a width measuring element is brought into contact with both sides of the terminal caulking part, and each measurement obtained at that time is made. In the method for measuring the dimensions of a terminal crimped part, in which the height and width of the terminal crimped part are measured based on a value and each measurement value obtained when the terminal crimped part is not fixed, the terminal crimped part is fixed. After that, the height measuring element is brought into contact with the upper part of the terminal crimping part with a pressing force to make the inclination of the terminal crimping part with respect to the writing table zero, and then the width measuring stylus of the terminal crimping part is brought into contact with the upper part of the terminal crimping part. 1. A method for measuring dimensions of a terminal caulking portion, characterized in that each of the width measuring elements is brought into contact with the terminal caulking portion with a pressing force to make the inclination to zero.