JP2002062235A - Abrasion test method for covered wire material and abrasion test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct abrasion test by maximumly simulating an environment of mounting on an automobile. SOLUTION: In this abrasion test method for a covered wire material, the covered wire material 5 such as a covered electric wire or an optical fiber cord is bent in curvature R and fixed to a fixing part 13, the bent part is pushed against the plane part of a mating material 2 such as an automobile component by applying a load F, and in this state the mating material 2 is rotated with a rotating machine 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for evaluating the abrasion resistance of a covered portion of a covered linear body such as a covered electric wire and an optical fiber cord to be mounted on a vehicle such as an automobile. The present invention relates to a method and a device for testing abrasion of a coated linear body that can be reproduced without any problem.

[0002]

2. Description of the Related Art In general, insulated wires are routed so as not to interfere with vibration, and a PVC tube or a corrugated tube is attached as a protective material to a portion likely to interfere. Wear is not possible (actually, there are places where tubes and the like are not used, but wiring that does not interfere is applied).

However, in the future, due to changes in the harness structure such as weight reduction and modularization, the use of protective materials will no longer be used, the types and sizes of electric wires and optical fibers, coating materials and conductors will be changed, and wiring methods will be changed. May be changed.

[0004] Although it is originally considered that the coating does not wear, there is a possibility that the coating may be worn for an unexpected reason. Therefore, a wear test of the coating material itself in an environment when mounted on a vehicle is required. .

[0005] Conventionally, a wear test of a covered electric wire has been conducted according to ISO.
-6722, JASO-D618, or JISC-34
There are a blade reciprocating method and a tape abrasion test method specified in J. No. 06.

In these abrasion test methods, a metal blade or a tape-shaped sandpaper is pressed against a covered portion of a covered electric wire with a constant load, and the number of reciprocations of the blade when the internal conductor is exposed is determined. Is a method of measuring the length of Here, there is no standard in the measurement results, and the number of reciprocations and the length of the sandpaper are determined by the parties using the electric wires.

[0007]

However, in the conventional wear test method, as described above, the test is performed using a metal blade or abrasive paper (sandpaper). However, there is actually no contact with metal blades or abrasive paper, even though it may come into contact with parts (such as the body, engine, and seat) of the vehicle.

[0008] Furthermore, since the abrasion and the form of wear of the polymer material such as the coating material of the coated linear body vary depending on the temperature, contact pressure, friction coefficient, friction speed, type of the mating material, etc. According to the measurement results of the test method, it is hard to say that the wear when mounted on the vehicle is reproduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an abrasion test method and an abrasion test apparatus for a coated linear body capable of performing an abrasion test by reproducing an environment when mounted on an automobile without limit. I do.

[0010]

In order to solve the above-mentioned problems, the present invention is directed to a coated linear tester for testing a coated wire such as a coated electric wire and an optical fiber cord for wear. A body abrasion test method, in which the coated linear body is curved, the curved portion is pressed against a flat portion of a mating material such as an automobile part, and the mating material is rotated or vibrated in this state. is there.

According to a second aspect of the present invention, the mating member has a surface equivalent to that of the automobile part, such as a flat plate made of a plastic material or a metal plate having the surface coated with the same paint as the body paint of the automobile. It includes a member processed to have a state.

According to a third aspect of the present invention, when the counterpart material is rotated or vibrated, its rotation speed or its vibration frequency, amplitude, ambient temperature, and the like are placed in an environment equivalent to that when mounted on an automobile. is there.

According to a fourth aspect of the present invention, there is provided an abrasion test apparatus used in the method of testing a coated linear body according to any one of the first to third aspects, wherein the coated linear body is curved. Along with fixing in a state, a fixed support portion that supports the coated linear body by pressing the curved portion against the flat portion of the mating material, and supports the mating material,
A sliding support base that rotates or vibrates the mating member in a state where the flat portion of the mating member is in contact with the curved portion of the coated linear body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A first embodiment of the present invention will be described below with reference to FIG. FIG.
BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the abrasion test apparatus used by the abrasion test method of the coated linear body which concerns on embodiment of this invention.

[0015] The method for testing the abrasion of a coated linear body is described in the following. This is a method of evaluating abrasion when rubbed against a flat part of a mating material such as an automobile part, assuming that the part interferes with a part (automobile part) constituting an automobile, and is shown in FIG. Friction test equipment 1A
(Here, the optical fiber cord is
An optical fiber whose surface is covered with a coating material).

As shown in FIG. 1, the wear test apparatus 1A has a sliding support frame 3 for supporting a mating member 2 such as an automobile part and a coated linear body 5 curved at a predetermined curvature R. And a fixed support portion 7 which is fixedly supported.

The covered wire 5 is intended for one or a plurality of bundled covered electric wires and optical fiber cords, and each covered electric wire and each optical fiber cord is provided with an electrically insulating or cored wire as a covering portion. Blended thermoplastic resins such as PVC (polyvinyl chloride) and polyolefins, thermosetting resins such as epoxy, UV-curable resins that cure with ultraviolet light, and multiple thermoplastic resins for the purpose of protecting and shielding Polymer blends or alloys, thermoplastic and thermosetting resins, blends of thermosetting resins, EPDM rubber, rubber such as silicone rubber, alkali metal salts and alkaline earth metal salts, metal oxides, Highly complex resin such as resin compounded with inorganic compounds such as ceramics, blended with conductive resin, or doped with metal ions Those materials either coated are subject.

The sliding support frame 3 includes a rotary drive 9 such as a motor. The rotary drive 9 has a rotary shaft 11
Are fixed to the slide granting support base 3 so as to project vertically upward from the upper surface of the slide granting support base 3. The counterpart material 2 is fixed to the tip of the rotating shaft 11 so that its flat portion faces upward and assumes a horizontal posture. As a result, the counterpart material 2 is rotated by the rotation drive of the rotation drive unit 9 with the plane portion thereof facing upward and the rotation axis 11 as the rotation axis while maintaining the horizontal posture.

As the mating member 2, in addition to the automobile parts themselves, a plastic material processed into a flat plate (hereinafter referred to as a plastic plate), or a metal plate or the like having the same surface paint as the vehicle body paint applied on the surface thereof. A member processed to have a surface state equivalent to that of an automobile part is used.

More specifically, as the plastic material processed into a flat plate, for example, polypropylene or nylon 66 used for instrument panels or protectors, the same material as polybutylene terephthalate used for connectors,
Grade products that are formed by extrusion or injection molding are used.

The fixed support portion 7 includes a fixed portion 13 to which the coated linear body 5 is fixed, and a support portion 15 for supporting the fixed portion 13.

The fixing portion 13 is formed, for example, in a rectangular plate-like body, and has a cylindrical body 17 having a predetermined radius R along one end face thereof along the longitudinal direction of the end face (perpendicular direction in FIG. 1). And the opposite end face side is supported by the support portion 15.

The fixed linear member 5 is
Is fixed along the curvature R (hereinafter, referred to as curvature R) of the cylindrical body 17 provided at one end thereof and fixed to the fixing portion 13. Here, as a method of fixing the covered linear body 5 to the fixing portion 13, for example, a method of fixing with a tape or an adhesive may be used, or the covered linear body 5 may be bound to the fixing portion 13 with a band or the like.

The support portion 15 applies a predetermined load F to the fixed portion 13.
To the fixed portion 13 which is curved at the curvature R as described above.
The curved portion of the linear wire body 5 fixed to the fixing member 13 is pressed against the flat portion of the mating member 2 from above vertically.
Is supported on the end face side. Here, as shown in FIG. 1, for example, the coated linear body 5 is arranged so that the direction of the orientation of the curved portion is orthogonal to the rotation direction of the counterpart material 2. Here, the orientation of the coated linear body 5 refers to an extrusion mark attached to the surface of the coated portion along the longitudinal direction of the coated linear body 5 when the coated linear body 5 is formed by extrusion. .

When the abrasion of the coated portion of the coated linear body 5 is tested using the abrasion test apparatus 1A having the above-described configuration, first, as a wear test environment, the ambient temperature is actually used in an automobile or the like by a constant temperature bath. Adjust the temperature so that it is within the specified temperature range. If you want to reproduce the engine room, spray sand or water. The wear test environment may be set arbitrarily according to the environment in which the coated linear body 5 is actually attached, and the wear of the coated linear body 5 may be measured.

Then, the rotating shaft 11 of the slide imparting support base 3
Is fixed to the upper end portion of the base member 2 such that the flat portion thereof is oriented upward and in a horizontal posture. Then, the wear test apparatus 1 is set so that the coated linear body 5 is curved at a predetermined curvature R.
A fixed portion 13 is fixed to the fixing portion 13 of FIG. 5A, and the curved portion of the covered linear body 5 is pressed against the flat portion of the mating member 2 by applying a load F from above vertically, and the fixing portion 13 is Let them support you.

At this time, the number, thickness, length, and the like of the covered linear members 5 fixed to the fixing portion 13 are also set to the same conditions as when mounted on an actual vehicle. In addition, it is better to set the curvature R when the covered linear body 5 is curved and the load F when the curved portion of the covered linear body 5 is pressed against the flat portion of the mating member 2 under the conditions that are matched when the vehicle is mounted. Good.

In this state, the rotary driving device 9 of the slide providing support base 3 is rotated to rotate the mating member 2. It is better to set the rotation speed of the rotary drive 9 to the same condition as when mounted on an actual vehicle.

At this time, the mating member 2 rotates while the flat portion of the mating member 2 is in sliding contact with the curved portion of the coated linear body 5.
Interference between the coated linear body 5 and the mating material 2 that cannot be reproduced by the conventional wear test method can be reproduced.

After this operation is continued for a predetermined time, the amount of wear of the coating of the coated linear body 5 may be measured with an outer diameter, a surface roughness meter, or the like.

<Embodiment 1> In the test apparatus of FIG.
Was set to 1 N, and the room temperature was set to 23 degrees.

The coated linear member 5 has an outer diameter of 2.2.
One insulated wire made of PVC having a length of 100 mm and a length of 100 mm was attached to the fixing portion 13. As the mating member 2, a plastic plate formed by injection-molding polybutylene terephthalate used for a housing or a connector of an automobile to a thickness of 2 mm was used.

When the mating member 2 was rotated at a speed of 0.3 m / sec for 500 hours, the coating portion having an outer diameter of 2.2 mm was worn by a maximum of 0.15 mm. The irregularities at the time of extrusion, which were observed in the above, disappeared, and the surface was smooth.

As described above, it was possible to perform a wear test under an environment similar to that when mounted on an automobile, which could not be reproduced by the conventional test method.

In this embodiment, as shown in FIG. 1, the covered linear portion 5 is fixed and supported such that the direction of the orientation of the curved portion of the covered linear member 5 is orthogonal to the rotation direction of the mating member 2. As described above, the coated linear body 5 may be fixedly supported such that the direction of the orientation of the curved portion of the coated linear body 5 is parallel to the rotation direction of the counterpart material 2. Thus, the coated linear body 5
By changing the direction of the orientation of the curved portion, a wear test can be performed in consideration of the direction of the orientation of the coated linear body 5.

Further, in this embodiment, as shown in FIG. 1, the flat part of the mating member 2 is supported so as to be in a horizontal posture with the upward facing, and the curved part of the covered linear body 5 is supported on the flat part. The case where the opposing material 2 is rotated in this state by pressing vertically from above has been described. However, the flat portion of the opposing material 2 is supported so as to be in a vertical posture with the horizontal portion, and the coated linear member is attached to the flat portion. The curved portion 5 may be pressed from the horizontal direction, and the mating member 2 may be rotated in this state.

The wear test apparatus 1C in this case is, for example,
As shown in FIG. 3, the rotating shaft 11 is horizontal, and the rotating shaft 11 is axially mounted on a side surface of the slide applying support base 3. At one end of the rotating shaft 11, the mating member 2 is placed in a vertical posture with its flat portion facing sideways. The rotation shaft 11 is rotated by transmitting the rotation power of the rotation drive unit 9 to the other end of the rotation shaft 11 via the belt 25. Then, the curved portion of the linear wire body 5 curved at the curvature R and fixed to the fixing portion 13 as described above is pressed against the flat portion of the mating member 2 by applying a predetermined load F from the horizontal direction. Thus, the fixing portion 13 may be supported by the supporting portion 15. In FIG. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals as those in FIG.

<Second Embodiment> A second embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a view for explaining a wear test apparatus used in the method for testing wear of a coated linear body according to the embodiment of the present invention.

The abrasion tester 1B used in the abrasion test method for the coated linear body is provided with a vibration generator 21 instead of the rotary drive unit 9 in the abrasion tester 1A shown in FIG. The configuration is the same as that of the abrasion test apparatus 1A in FIG. 1 except that the counterpart material 2 of the embodiment is vibrated instead of being rotated. Therefore, in FIG. 2, the same parts as those of the wear test apparatus 1A of FIG. 1 are denoted by the same reference numerals, and the description of those parts is omitted.
Only parts different from A will be described below.

The vibration generator 21 is fixed to the slide application support base 3 so that its vibration shaft 23 projects vertically upward from the upper surface of the slide application support base 3. Is vibrated in a horizontal uniaxial direction while facing upward. And the vibration axis 2
A mating member 19 is fixed to the distal end of the third member 3 so that its flat portion faces upward and is in a horizontal posture. As a result, the counterpart material 19 is vibrated in a horizontal uniaxial direction in a horizontal posture with its plane portion directed upward by the horizontal vibration motion of the vibration generator 21.

When the abrasion of the coated portion of the coated linear body 5 is tested using the abrasion test apparatus 1B having the above-described configuration, the room temperature, which is the abrasion test environment, is measured in the same manner as the abrasion test apparatus 1A of FIG. A load F for pressing the curved portion of the coated linear body 5 against the flat portion of the mating member 19, and a curvature R for bending the coated linear body 5
Etc. are set under the same conditions as when mounted on an actual vehicle. The vibration frequency of the vibration generator 21 is also preferably set closer to the vibration frequency of the actual vehicle, and is set to 50 Hz or less, preferably within the range of 5 to 30 Hz. A detailed description of the wear test method using the wear test device 1B will be omitted.

<Embodiment 1> In the test apparatus shown in FIG.
The load F pressed against 9 was set to 1 N, and the room temperature was set to 23 degrees.

The coated linear body 5 has an outer diameter of 2.2.
One insulated wire made of PVC having a length of 100 mm and a length of 100 mm was attached to the fixing portion 13. As the mating member 19, a housing made of polybutylene terephthalate, which is an automobile part, was used.

Then, the partner material 19 is set to a vibration frequency of 10H.
z, amplitude 2mm, when vibrated for 500 hours, the outer part of outer diameter 2.2mm is worn out by 0.08mm at the maximum, and the unevenness at the time of extrusion seen on the surface of the conventional electric wire disappears, and the smooth surface Had become.

As described above, it was possible to perform a wear test in an environment similar to that when mounted on an automobile, which could not be reproduced by the conventional test method.

[0046]

According to the first aspect of the present invention, the coated linear body is curved, and the curved portion is pressed against a flat portion of a mating material such as an automobile part. Because of the rotation or vibration, the interference state during actual use can be reproduced and a useful wear test can be performed, as compared with the conventional case where a wear test is performed with a metal blade or abrasive paper.

In particular, since the coated linear body is curved and the curved portion is pressed against the flat portion of the mating member,
The load when pressing the coated linear body against the counterpart material is easily adjusted, and the coated linear body can be appropriately pressed against the counterpart material.

According to the second aspect of the present invention, the mating member is made of a plastic material which is flat-plated or the same as an automobile part such as a metal plate whose surface is coated with the same paint as the body paint of the automobile. Since it includes a member processed so as to have the surface condition described above, it is possible to reproduce an interference state during actual use which is difficult to reproduce, and it is possible to perform a useful wear test.

According to the third aspect of the present invention, when rotating or vibrating the counterpart material, the rotation speed, the vibration frequency, the amplitude, the ambient temperature, and the like are set in the same environment as when mounted on an automobile. Therefore, it is possible to reproduce the environmental condition at the time of actual use, and it is possible to perform a useful wear test.

According to the fourth aspect of the present invention, the first aspect is provided.
The present invention can provide an apparatus capable of performing the method for testing abrasion of a coated linear body according to the third aspect.

[Brief description of the drawings]

FIG. 1 is a view showing a wear test apparatus used for a wear test method of a coated linear body according to a first embodiment of the present invention.

FIG. 2 is a view showing another wear test apparatus used in a method of testing a coated linear body for wear according to a second embodiment of the present invention.

FIG. 3 is a view showing a modified example of the wear test apparatus used in the method for testing the wear of a coated linear body according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B, 1C Abrasion test equipment 2, 19 Counterpart material 3 Support stand 5 Coated linear body 7 Fixed support part 9 Rotary drive R Radius (curvature) F Load

Claims (4)

[Claims] 1. A method for testing the abrasion of a covered portion of a covered linear body such as a covered electric wire and an optical fiber cord, the method comprising the steps of: a) bending the covered linear body; A method for abrasion test of a coated linear body, wherein the method is applied to a flat part of a mating material such as an automobile part, and the mating material is rotated or vibrated in this state. 2. The mating member has a surface state equivalent to that of the automobile part such as a plate material of a plastic material or a metal plate having the surface coated with the same paint as an automobile body paint. The method for testing abrasion of a coated linear body according to claim 1, comprising a processed member. 3. The method according to claim 1, wherein, when rotating or vibrating the mating member, the rotation speed, the vibration frequency, the amplitude, the ambient temperature, and the like of the mating material are set in the same environment as when mounted on an automobile. Item 3. A wear test method for a coated linear body according to Item 2. 4. A wear test apparatus used in the method for testing a coated linear body according to claim 1, wherein the coated linear body is fixed in a curved state. A fixed support portion for supporting the coated linear body by pressing the curved portion against the flat portion of the mating material; and supporting the mating material, wherein the flat portion of the mating material is formed of the covering wire. A sliding application support base that rotates or vibrates the counterpart material in contact with the curved portion of the body.