JPH06160262A - Method and jig for testing abrasion resistance - Google Patents

Abstract

PURPOSE:To provide a method for testing abrasion resistance which allows reduction of manufacturing time or manufacturing cost. CONSTITUTION:An insulating sheet 23 of same material is prepared at a thickness (t) corresponding to that of an insulation coating layer 3 of the conductor 2 in a wire 1. The insulation sheet 23 is wound tightly around an elongated detecting protrusion 21a having an arched outer peripheral surface of diameter R corresponding to that of the conductor 2 and provided at one end of a detecting conductor 21. An inspection blade 7 is pressed with predetermined pressure against the outer side face of the insulation sheet 23 wound around the detecting protrusion 21a. The inspection blade 7 is then reciprocated along the longitudinal direction of the detecting protrusion 21a and the number of reciprocating times of the inspection blade 7 is measured until the inspection blade 7 comes into contact with the detecting conductor 21 due to abrasion of the insulating sheet 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear resistance test method and a wear resistance test jig suitable for inspecting the wear resistance of an insulating coating layer of an electric wire.

[0002]

2. Description of the Related Art Conventionally, as shown in the sectional view of FIG.
As a method of inspecting the abrasion resistance of the insulating coating layer 3 made of vinyl resin or the like for covering the outer periphery of the conductor 2 of the electric wire 1, there is a reciprocating motion type abrasion resistance test.

As shown in FIG. 9, this abrasion resistance test is carried out on the inspection table 5 for a predetermined length (for example, about 750 m).
The sample electric wire 1 of m) is arranged on a straight line and fixed by a clamp 6 or the like, and the conductor 2 of the sample electric wire 1 and the inspection blade 7 are electrically connected. Then, JISG352 of the inspection blade 7
C hard steel wire specified in 1 (diameter 0.45 ± 0.01
5 mm) or the like on the insulating coating layer 3 of the sample electric wire 1 with a predetermined pressing force (for example, a load of 0.714 Kg).
Under pressure, the inspection blade 7
Is reciprocated along the longitudinal direction of the sample electric wire 1 at a constant stroke (for example, 10 mm) and at a predetermined speed (for example, 50 to 60 times / min). The insulating coating layer 3 is worn by the reciprocating motion of the inspection blade 7, and the abrasion resistance test is performed by measuring the number of reciprocations until the continuity measuring device 9 detects the continuity due to the contact between the inspection blade 7 and the conductor 2. Was there.

[0004]

However, according to the above-mentioned conventional method, it is necessary to manufacture the sample electric wire 1 for the abrasion resistance test, and it takes a lot of time to manufacture the sample electric wire 1, and the manufacturing time and the manufacturing cost are increased. It had the drawback of being wasteful.

In view of the above problems, it is an object of the present invention to provide a wear resistance test method and a wear resistance test jig which can reduce the manufacturing time and manufacturing cost.

[0006]

The technical means of the abrasion resistance test method for achieving the above object is to use an insulating sheet of the same material with a thickness corresponding to the thickness of the insulating coating layer that coats the outer circumference of the conductor of the electric wire. Created and wound by fixing the insulating sheet to the detection conductor, which has an arc-shaped outer peripheral surface with a radius corresponding to the radius of the conductor and which is provided on one end side and which is long in one direction. Then, the inspection blade is pressed against the outer surface side of the insulating sheet wound around the detection ridge under a predetermined pressure, and the inspection blade is reciprocated along the longitudinal direction of the detection ridge under the pressure to insulate the insulation sheet. The point is to measure the number of reciprocations of the inspection blade until the inspection blade comes into contact with the detection conductor due to abrasion of the sheet.

Further, the abrasion resistance test jig is a detection conductor having a detection ridge on one end side, the detection ridge having an arcuate outer peripheral surface having a radius corresponding to the radius of the conductor of the electric wire, and the detection conductor. In other words, it is provided with a pressing plate that presses both ends of the insulating sheet wound so as to come into close contact with the detection ridge from the side of the detection conductor to the side of the detection conductor and holds them in a clamped manner.

[0008]

According to the abrasion resistance test method of the present invention, even if the sample electric wire for abrasion resistance test is not manufactured, the same material having the same thickness as the insulating coating layer covering the conductor outer circumference of the electric wire is manufactured. If only the insulating sheet is manufactured, the abrasion resistance test under the same conditions as the sample electric wire can be performed, and the abrasion resistance test sample can be easily manufactured, and the manufacturing time and the manufacturing cost can be reduced. You can

Further, if an insulating sheet is tightly wound around the detection ridge of the detection conductor and both end portions of the insulation sheet are pressed from the side of the detection conductor to the detection conductor side by a holding plate,
The insulating sheet can be satisfactorily fixed and held, and the abrasion resistance test can be satisfactorily performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, reference numeral 20 is a wear resistance tester, and the same components as those in the prior art are designated by the same reference numerals as those described above. And its details are omitted.

On the inspection table 5, a detection conductor 21 as a jig and a pair of holding plates 22 are provided.

The detection conductor 21 is formed on a slender rectangular flat plate, and the long side on one end side corresponds to the radius R of the conductor 2 of the electric wire 1 to be subjected to the abrasion resistance test, as shown in FIG. It is configured as a detection ridge 21a having a circular arc-shaped outer peripheral surface with a radius R that extends in one direction. Then, the detection conductor 21
Is detachably fixed to the upper surface of the inspection table 5 in an upright manner with the detection ridge 21a on the upper side and the long side on the other end side on the lower side, and the detection conductor 21 and the inspection table 5 are fixed to each other in an insulating state. Has been done.

The holding plates 22 are formed in the shape of an elongated rectangular flat plate, are arranged on both sides of the detection conductor 21, and can be pressed and released from the side of the detection conductor 21 to the side surface of the detection conductor 21. ing.

The electric wire 1 to be subjected to the abrasion resistance test
When it is desired to know the wear resistance of the insulation coating layer 3, the thickness t of the insulation coating layer 3 covering the outer periphery of the conductor 2 of the electric wire 1 to be subjected to the wear resistance test is equivalent to that shown in FIG. A rectangular insulating sheet 23 of the same material having a thickness t is manufactured in advance.

Next, as shown in FIGS. 1 to 3, the insulating sheet 23 is wound so as to be in close contact with the detection ridge 21a of the detection conductor 21, and both ends of the insulation sheet 23 are held by the pressing plates 22. Press down on the side and insulate sheet 2
3 is fixed and held in a sandwiched manner. In addition, pressurizing the holding plate 22
As the means for releasing, a screw mechanism, a hydraulic mechanism, or the like may be appropriately adopted.

Next, the detection conductor 21 and the inspection blade 7 are electrically connected (or the detection conductor 21 and the inspection blade 7 are electrically connected in advance), and the edge portion of the inspection blade 7 is formed. 8 is pressed against the upper surface side of the insulating sheet 23 wound around the detection ridge 21a under a predetermined pressing force, and the inspection blade 7 is fixed along the longitudinal direction of the detection ridge 21a under the pressure. Stroke, reciprocate at a predetermined speed.

The insulating sheet 23 is gradually worn by the reciprocating motion of the inspection blade 7, and finally the inspection blade 7
The inspection blade 7 and the detection conductor 21 are brought into conduction with each other when the detection ridge 21a comes into contact with each other, and the number of reciprocations of the inspection blade 7 when the conduction measuring device 9 detects this conduction may be measured.

As described above, according to the abrasion resistance test method, the sample electric wire 1 for the abrasion resistance test, which is time-consuming to manufacture, is used.
Even if not manufactured, only the insulating sheet 23 of the same material is manufactured with the thickness t corresponding to the thickness t of the insulating coating layer 3 covering the outer periphery of the conductor 2 of the electric wire 1 to be subjected to the abrasion resistance test, and the detection is performed. If the conductor 21 is tightly wound around and fixed to the detection ridge 21a, a wear resistance test under the same conditions as the sample electric wire 1 can be performed, and an insulating sheet 23 serving as a wear resistance test sample can be obtained.
Can be easily manufactured, and the manufacturing time and manufacturing cost can be reduced.

Further, the insulating sheet 23 is tightly wound around the detecting ridge 21a of the detecting conductor 21, and both ends of the insulating sheet 23 are pressed from the side of the detecting conductor 21 to the side of the detecting conductor 21 by the holding plate 22 in a sandwiched manner. If so, the insulating sheet 23 can be favorably fixed and held. At this time, as shown in FIG. 4, if gap preventing portions 25 such as grid-like grooves, ridges and knurls are formed on both side surfaces of the detecting conductor 21, the position of the insulating sheet 23 during the abrasion resistance test can be improved. The shift can be more effectively prevented. Further, as shown in FIG. 5 and FIG. 6, as a configuration in which a misalignment preventing mechanism 28 including a concave groove 26 and a ridge 27 is provided between the both side surfaces of the detection conductor 21 and the opposing surfaces of the pressing plates 22, The insulating sheet 23 may be prevented from being displaced.

Further, in each of the above embodiments, the detection ridge 21a of the detection conductor 21 has a structure having an arc-shaped outer peripheral surface of 180 degrees, but as shown in FIG. The structure may have an arcuate outer peripheral surface that exceeds the above.

If a plurality of types of sensing conductors 21 having sensing ridges 21a having arcuate outer peripheral surfaces of various radii R are prepared, various electric wires can be produced by producing only the insulating sheet 23 of various thickness t. The wear resistance of the first insulating coating layer 3 can be easily inspected.

[0022]

As described above, according to the abrasion resistance test method of the present invention, an insulating sheet made of the same material having a thickness corresponding to the thickness of the insulating coating layer covering the outer circumference of the conductor of the electric wire is prepared, The detection sheet is wound around and fixed to a detection conductor having a one-sided detection strip having an arcuate outer peripheral surface having a radius corresponding to the radius of The inspection blade is pressed against the outer surface side of the insulating sheet wrapped around the strip under a predetermined pressure, and the inspection blade is reciprocated along the longitudinal direction of the detection ridge under the pressure to inspect it by abrasion of the insulating sheet. It is a method to measure the number of reciprocations of the inspection blade until the blade contacts the detection conductor, and it corresponds to the thickness of the insulating coating layer that coats the outer circumference of the conductor of the electric wire without manufacturing a sample electric wire for abrasion resistance test. Thickness By making only an insulating sheet of the same material with, it is possible to carry out a wear resistance test under the same conditions as the sample electric wire, and it is possible to easily make a sample for the wear resistance test. Can be reduced.

Further, according to the abrasion resistance test jig of the present invention, the detection conductor having the one-sided long detection ridge having the arcuate outer peripheral surface having the radius corresponding to the radius of the conductor of the electric wire is provided. And a holding plate that presses both ends of the insulating sheet wound so as to be in close contact with the detection ridges of the detection conductor from the side of the detection conductor to the detection conductor side and fixedly holds them in a sandwiched manner. Therefore, the insulating sheet can be satisfactorily fixed and held, and the abrasion resistance test can be satisfactorily performed.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an example of an abrasion resistance test apparatus used for carrying out a method of the present invention.

FIG. 2 is an overall schematic explanatory diagram of the same.

FIG. 3 is a side view of FIG.

FIG. 4 is a perspective view of a detection conductor.

FIG. 5 is a side view showing another embodiment of the wear resistance test jig.

FIG. 6 is a side view showing another embodiment of the wear resistance test jig.

FIG. 7 is a side view showing another embodiment of the abrasion resistance test jig.

FIG. 8 is a cross-sectional view of an electric wire.

FIG. 9 is a schematic explanatory view showing a conventional abrasion resistance test apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire 2 Conductor 3 Insulation coating layer 7 Inspection blade 20 Abrasion resistance tester 21 Detection conductor 21a Detection ridge 22 Holding plate 23 Insulation sheet

Claims (2)

[Claims] 1. An insulating sheet made of the same material having a thickness corresponding to the thickness of an insulating coating layer that coats the outer circumference of a conductor of an electric wire,
The insulating sheet is wound around and fixed to a detection conductor having a detection ridge long in one direction having an arc-shaped outer peripheral surface having a radius corresponding to the radius of the conductor, so that the insulating sheet is closely attached to the detection ridge. The inspection blade is pressed against the outer surface side of the insulating sheet wrapped around the detection ridge under a predetermined pressure, and the inspection blade is reciprocated along the longitudinal direction of the detection ridge under the pressure to wear the insulation sheet. The abrasion resistance test method is characterized in that the number of reciprocations of the inspection blade until the inspection blade comes into contact with the detection conductor is measured by. 2. A detection conductor having a unidirectionally long detection ridge having an arcuate outer peripheral surface having a radius corresponding to the radius of a conductor of an electric wire, and a detection ridge of the detection conductor so as to be in close contact with the detection ridge. A jig for wear resistance test, comprising: a holding plate that holds both ends of the wound insulating sheet from the sides of the detection conductor to the side of the detection conductor and holds them in a clamped manner.