JPH07218405A - Measuring edge-lay bonding strength - Google Patents

Abstract

PURPOSE:To enable accuracte evaluation of edge-lay bonding strength by providing a base material with a wide chucking part and constricted bonding part of a contact material and forming a wide chucking part with an auxiliary specimen at the other edge of the contact material. CONSTITUTION:A rectangular plane specimen 6 with a narrow junction is prepared by punching out an edge lay material with a hand press. The specimen 6 is joined to an auxiliary material 7 of the same property as a base material 1 at a junction by holding the other edge of the specimen 6. The specimens 6 is soldered or bonded with adhesive to the auxiliary material 7 at the front and back sides, or either front or back side. The specimens 7 and 6, and the base material 1 are chucked, and subjected to a tensile test to measure the junction strength of the base material 1 and contact material. A tensile force by which the junction is broken is indicated numerically as the bonding strength and evaluated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge lay bonding strength measuring method capable of accurately expressing the bonding strength of an edge lay material for electrical contacts such as connectors.

[0002]

2. Description of the Related Art As shown in FIG. 1, the bonding strength of an edge lay material 3 in which a thin contact material 2 is bonded to one end of a strip-shaped base material 1 is measured by measuring the bonded contact material 2 with a very small width. Therefore, it was difficult and there was no suitable method. For this reason, conventionally, after cutting the edge lay material 3 into an appropriate length,
As shown in Fig. 6, the contact material 2 is pressed against the rectangular block 4 and sandwiched and fixed by the other rectangular block 4, and then, as shown in FIG.
As shown in Fig. 7, the base material 1 is bent horizontally, and as shown in Fig. 7, the base material 1 is folded back vertically so that the number of times of bending and folding is measured. The edge ray joint strength was displayed.

By the way, in the above-mentioned edge lay bonding strength measuring method, there is a correlation between the number of bendings and the strength, but the value is not suitable. That is, even if the sheet was bent even once, it sometimes broke, but it was not an appropriate evaluation because it does not cause any problem in press working for commercialization. Also, during the measurement work, it is difficult to apply the joint to the upper edge of the rectangular block 4, and since the upper joint is harder than other parts, even if it is applied to the upper edge of the rectangular block 4, the joint will not easily fold. It will not bend and will bend slightly above the joint. Therefore, it cannot be bent accurately at the joint.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to provide a highly reliable measuring method capable of accurately and stably digitizing and evaluating the edge ray bonding strength.

[0005]

In order to solve the above-mentioned problems, the edge-ray bonding strength measuring method of the present invention measures the bonding strength of an edge-ray material in which a thin contact material is bonded to one end of a strip-shaped base material. , Make a sample piece with the edge ray material constricted at the joint, then sandwich the outer edge of the contact material on the side opposite to the joint of this sample piece to join the auxiliary sample, and after that This auxiliary sample and the base material of the sample piece are chucked to perform a tensile test, and the bonding strength between the base material and the contact material is measured. Here, the joining of the auxiliary sample is not limited to soldering, but may be joining with an instant adhesive or resin, and is not limited to the front and back sides, but may be the front side or the back side. The sample piece is preferably a flat rectangular shape with a narrowed joint. Further, the processing from the edge lay material to the sample piece is performed by pressing, but is not limited thereto. Furthermore, the auxiliary sample is not limited to a rectangle.

[0006]

As described above, according to the method of measuring the edge lay joint strength of the present invention, the base material is made into a wide chucking portion by constricting the joint portion of the base material and the contact material, and the auxiliary sample is provided on the outer end of the contact material. Since a wider chucking part is formed on the other side by soldering and both chucking parts can be securely chucked to the tensile tester, the tensile test can be performed stably and accurately, so the measured value can be used as the base material. It can be expressed as the contact strength value of the contact material and has high reliability.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for measuring edge lay joint strength according to the present invention will be described with reference to the drawings.
14mm, 0.08mm thick Cu-Ni 20-22wt% -Sn 4.5-
The bonding strength of the edge lay material 3 in which a thin contact material 2 made of Ag-Pd 40 wt% -Cu 20 wt% having a width of 2 mm and a thickness of 0.08 mm is joined to one side end of the strip-shaped base material 1 made of 5.7 wt% is measured. At this time, the edge lay material 3 is punched by a hand press as shown in FIG.
A flat rectangle that is constricted to a length of 3 mm (length 16 mm, width
20mm) sample piece 6 is made, and then the joint part 5 of this sample piece 6
As shown in FIG. 3, with the outer end portion of the contact material 2 on the opposite side of the contact material 2 sandwiched, an auxiliary sample 7 made of the material of the rectangular base material 25 (length 25 mm, width 20 mm) is used on both front and back sides as well as on both front and back sides. Then, the auxiliary sample 7 and the base material 1 of the sample piece 6 are chucked by soldering or an adhesive material, and a tensile test is performed as shown in FIG. The bonding strength of the material 2 was measured. Then, the tensile strength at which the joint 5 was broken was quantified as a joint strength and evaluated. The results are shown in the table below.

[0008]

[Table 1]

[0009]

As described above, according to the edge-lay bonding strength measuring method of the present invention, since the edge-ray bonding strength can be accurately and stably quantified and evaluated by the tensile test, the reliability is high and the conventional edge-ray bonding strength is high. It can replace the measuring method.

[Brief description of drawings]

FIG. 1 is a perspective view showing an edge lay material.

FIG. 2 is a diagram showing steps of one embodiment of the method for measuring edge lay joint strength of the present invention.

FIG. 3 is a diagram showing a process of an embodiment of the edge ray bonding strength measuring method of the present invention.

FIG. 4 is a diagram showing a process of an embodiment of the edge ray bonding strength measuring method of the present invention.

FIG. 5 is a diagram showing steps of a conventional edge ray bonding strength measuring method.

FIG. 6 is a diagram showing steps of a conventional edge-lay bonding strength measuring method.

FIG. 7 is a diagram showing steps of a conventional edge-lay bonding strength measuring method.

[Explanation of symbols]

 1 Band-shaped base material 2 Thin contact material 3 Edge lay material 5 Joint part 6 Specimen piece 7 Auxiliary specimen

Claims (5)

[Claims] 1. In measuring the bonding strength of an edge lay material in which a thin contact material is bonded to one end of a strip-shaped base material,
Make a sample piece with the edge lay material constricted at the joint, then sandwich the outer edge of the contact material on the side opposite to the joint of this sample piece to join the auxiliary sample, and then with this auxiliary sample An edge lay bonding strength measuring method, comprising: chucking the base material of the sample piece to perform a tensile test to measure the bonding strength between the base material and the contact material. 2. The method for measuring edge-ray bonding strength according to claim 1, wherein the edge-ray material is pressed out to prepare a sample piece. 3. The method for measuring edge-ray bond strength according to claim 1, wherein the test piece is a flat rectangular shape having a narrowed joint. 4. The edge-ray bonding strength measuring method according to claim 1, 2 or 3, wherein the auxiliary sample has a rectangular shape. 5. The edge lay bonding strength method according to claim 1, 2, 3 or 4, wherein the auxiliary sample is bonded with solder or an adhesive or resin.