JP2019200169A - Hose behavior check method in caulking - Google Patents

Abstract

To provide a method for actually checking behavior of a hose inside a caulking when a mouthpiece into which the hose is inserted is caulked.SOLUTION: A behavior marker (for example, a copper wire 5) which follows behavior of a hose 1 is disposed inside a portion that is inserted into a mouthpiece 2 of the hose 1. The behavior marker inserts the internally disposed hose 1 into the mouthpiece 2. Before and after caulking the mouthpiece 2 into which the hose 1 is inserted, a behavior marker arranged inside the hose 1 is photographed by an internal image photographing device (for example, an X-ray CT device) together with the mouthpiece 2 and the hose 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for confirming the behavior of a hose inside a caulking when the fitting with the hose inserted therein is caulked.

  In the past, the applicant of the present application has applied for an invention related to a fastening structure of a fitting and a hose described in Patent Document 1. This prior art has the following configuration. A rectangular groove is formed on the outer periphery of the tip side of the nipple, and a rubber band ring is attached to the rectangular groove. Further, a groove is formed on the outer periphery of the rear end side of the nipple, and an adhesive is applied to the groove. With this configuration, it is possible to fasten the fitting and the hose that can withstand the cold impulse test.

  In the fastening method of fastening the mouth fitting and the hose by caulking the fitting with the hose inserted as described above, the fluid sealing property is the inner surface of the hose after the crimping and the mouth fitting. It is affected by the surface pressure between the outer surface of the nipple. When the surface pressure is large, the sealing performance is high, and when the surface pressure is small, the sealing performance is low. As a method for grasping the surface pressure, for example, there are the following methods. Wrap pressure-sensitive paper around the outer surface of the nipple, and with the pressure-sensitive paper wrapped, insert the hose into the fitting. Then, crimp the fitting. When the fitting is finished, disassemble it and visually check the degree of coloration and color distribution on the outer peripheral surface of the nipple.

JP 2008-286365 A

  However, unfortunately, there was not much correlation between the magnitude of the surface pressure grasped by the above method using pressure sensitive paper and the fluid sealing performance. Since the hose (rubber) inside the caulking moves when the hose is fastened (when the fitting is caulked), the maximum surface pressure during caulking is not maintained as it is after caulking. On the other hand, what is detected by the pressure sensitive paper is the maximum surface pressure during caulking.

  Therefore, it is important to know how the hose inside the caulking moves when the hose is tightened in order to grasp the fluid sealing performance. If it is possible to determine how the hose inside the caulking moves, the result is reflected in CAE (computer aided engineering), and stress analysis by CAE that reflects the actual hose behavior is used. By reproducing the behavior, it becomes possible to grasp the surface pressure after crimping between the inner surface of the hose and the outer surface of the nipple, and thus the fluid sealing performance more accurately than before.

  The present invention has been made in view of the above circumstances, and its purpose is to provide a method for actually confirming the behavior of the hose inside the caulking when the fitting with the hose inserted therein is caulked. It is to be.

  The present invention is a method for confirming the behavior of a hose inside a caulking when the metal fitting into which the hose is inserted is caulked, and a behavior marker that follows the behavior is inserted into the metal fitting of the hose. A marker placing step for placing the hose in which the behavior marker is placed inside, a hose insertion step for inserting the hose in which the behavior marker is placed inside, and before and after crimping the mouth fitting in which the hose is inserted And a photographing step of photographing the behavior marker disposed inside together with the fitting and the hose by an internal image photographing device.

  According to the present invention, it is possible to actually confirm the behavior of the hose inside the caulking by photographing the behavior marker arranged inside the hose together with the fitting and the hose with the internal image photographing device.

It is a partial sectional side view which shows the state by which the hose by which the behavior marker (copper wire) was arrange | positioned inside the part inserted in a metal fitting was inserted in the metal fitting. It is a partial sectional side view which shows the state after the fitting which the hose was inserted shown in FIG. 1 was crimped. It is the external appearance photograph of the hose by which the behavior marker (copper wire) is arrange | positioned inside. It is the image image | photographed using the X-ray CT apparatus in the state which inserted the hose by which the behavior marker (copper wire) is arrange | positioned inside the part inserted in a metal fitting. It is the image image | photographed using the X-ray CT apparatus, after crimping the metal fitting shown in FIG. 4 in which the hose was inserted.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 is a partial side view showing a state before a caulking, in which a hose 1 in which a plurality of copper wires 5 as behavior markers are arranged inside a portion to be inserted into the fitting 2 is inserted into the fitting 2. It is sectional drawing. Moreover, FIG. 2 is a partial side sectional view showing a state after the fitting 2 into which the hose 1 is inserted shown in FIG.

(About fittings and hoses)
The metal fitting 2 is composed of a nipple 4 into which a hose is inserted, and a socket 3 disposed outside the nipple 4. The base metal 2 is fixed by caulking the socket 3 from the outer peripheral side by aligning the bottomed bottom portion 3a of the socket 3 with the groove 4a formed on the outer peripheral surface of the nipple 4 in the axial direction. The material of the fitting 2 (nipple 4 and socket 3) is, for example, aluminum alloy, stainless steel or the like.

  As shown in FIGS. 1 and 2, the hose 1 is a rubber layer single-layer hose, for example. The hose 1 is not limited to a single rubber layer, but includes a plurality of rubber layers, a combination of a resin layer and a rubber layer, or a rubber layer, a reinforcing layer (fiber layer), and a rubber layer. Or a combination of these.

  The hose 1 and the fitting 2 are caulked as follows. The hose 1 is inserted between the nipple 4 constituting the fitting 2 and the socket 3, and then the socket 3 is crimped from the outer peripheral side.

(How to check hose behavior inside caulking)
One embodiment of the hose behavior confirmation method inside the caulking will be described below in the order of steps. In addition, in the description of each process described below, a description of modified examples in each process is appropriately added.

<Marker placement process>
A plurality of copper wires 5 as behavior markers that follow the behavior of the hose 1 inside the caulking when the mouth fitting 2 into which the hose 1 is inserted are caulked inside the portion of the hose 1 that is inserted into the fitting 2 Deploy. In addition, as shown in FIG. 1, you may arrange | position the copper wire 5 to the area | region beyond the part inserted in the fitting 2 of the hose 1 in the axial direction of the hose 1.

  Here, first, a needle-like cylindrical body (not shown) is inserted into the hose 1 from the outer surface of the portion of the hose 1 to be inserted into the fitting 2 toward the inside of the hose 1. It is preferable that the needle-shaped cylinder has a hole having a diameter into which the copper wire 5 can be inserted, and the tip thereof is sharpened by, for example, being cut obliquely. The needle-like cylinder is like an injection needle, for example. Further, the needle-shaped cylinder is inserted into the hose 1 to a depth that penetrates the inner surface of the hose 1.

  Next, the copper wire 5 is inserted into the cylindrical body inserted into the hose 1. The copper wire 5 is inserted into the cylindrical body in a direction from the outer surface of the hose 1 to the inner surface (inward radial direction of the hose 1) until it protrudes from the inner surface of the hose 1. When the insertion of the copper wire 5 is completed, the cylinder is extracted from the hose 1. When the cylindrical body is extracted, the volume of the cylindrical body, the hose 1 contracts, and the hose 1 adheres to the copper wire 5. Finally, the portion of the copper wire 5 that protrudes from the inner and outer surfaces of the hose 1 is cut.

  By repeating the above operation a plurality of times, a plurality of copper wires 5 are arranged inside the hose 1 at predetermined intervals along the axial direction of the hose 1. Note that a plurality of the cylinders may be inserted into the hose 1 in advance, and then a plurality of copper wires 5 may be inserted into the cylinders. The photograph shown in FIG. 3 is an appearance photograph of the hose 1 in which the copper wire 5 as the behavior marker is disposed inside (the needle-shaped cylinder is pulled out from the hose 1).

  The behavior marker that moves (deforms) following the behavior of the hose 1 is not limited to the copper wire 5. For example, instead of the copper wire 5, a metal wire such as a stainless steel wire may be used as the behavior marker.

  Further, a fiber yarn impregnated with paste-like metal powder (metal paste) may be used as a behavior marker. In this case, a plurality of behavior markers (fiber threads impregnated with metal paste) are arranged inside the hose 1 along the axial direction of the hose 1 so that the hose 1 is sewn with the fiber thread. Alternatively, using the needle-shaped cylinder, that is, the needle-shaped cylinder is inserted into the hose 1, and the fiber thread impregnated with the metal paste is inserted into the cylinder inserted into the hose 1. Then, the behavior body (fiber yarn impregnated with metal paste) is arranged inside the hose 1 by removing the cylinder from the hose 1. As in the case of the copper wire 5, the portion of the fiber yarn impregnated with the metal paste that protrudes from the inner and outer surfaces of the hose 1 is cut.

  Furthermore, a plurality of small holes may be formed in the hose 1 at predetermined intervals along the axial direction of the hose 1, and the metal paste poured into the holes may be used as the behavior marker. . If you want to see the movement of the reinforcing layer (fiber layer) instead of the rubber layer using a metal paste as a behavior marker, for example, use a syringe to pour the metal paste into the reinforcing layer (fiber layer). Thus, the metal paste poured into the reinforcing layer (fiber layer) can be used as a behavior marker. Furthermore, when the movement inside the hose 1 is desired to be seen at a pin point, a metal paste is poured into the desired point by, for example, a syringe.

  Furthermore, an example in which a plurality of metal wires such as the copper wire 5 and fiber yarn impregnated with a metal paste are arranged in the hose 1 at predetermined intervals along the axial direction of the hose 1 has been described. However, the metal wire such as the copper wire 5 or the fiber yarn impregnated with the metal paste may be disposed only at a point where the movement inside the hose 1 is desired, that is, at only one point.

  Further, in the circumferential direction of the hose 1, a metal wire such as the copper wire 5 or a fiber yarn impregnated with a metal paste may be disposed every 120 °, for example. That is, the behavior markers may be arranged in a plurality of rows along the axial direction of the hose 1 at a predetermined interval in the circumferential direction of the hose 1. In addition, you may arrange | position a behavior marker only in 1 row.

  The behavior marker may be any material that can be photographed (identified) by an internal image photographing device such as an X-ray CT device in a rubber layer, a resin layer, a fiber layer, etc. constituting the hose. The material of the metal such as a metal paste is not limited.

<Hose insertion process>
A hose 1 in which a plurality of copper wires 5 are arranged inside a portion to be inserted into the fitting 2 is inserted between the nipple 4 and the socket 3 constituting the fitting 2. FIG. 1 is a view showing a state in which the hose 1 is inserted between the nipple 4 and the socket 3 constituting the fitting 2.

<Photographing process>
Next, first, a plurality of copper wires 5 arranged inside the hose 1 in a state shown in FIG. 2 (nipple 4 and socket 3) and hose 1 are photographed by an internal image photographing apparatus such as an X-ray CT apparatus. In addition to the X-ray CT apparatus, the internal image imaging apparatus includes an MRI (magnetic resonance imaging) apparatus. The photograph shown in FIG. 4 is an image taken using an X-ray CT apparatus before crimping the fitting 2 (socket 3).

  Next, after crimping the fitting 2 (socket 3), the plurality of copper wires 5 arranged inside the hose 1 together with the fitting 2 (nipple 4 and socket 3) and the hose 1 are X-ray CT apparatuses, etc. Shoot again with the internal image capturing device. The photograph shown in FIG. 5 is an image taken using an X-ray CT apparatus after crimping the fitting 2 (socket 3). As can be seen from a comparison between the photograph of FIG. 4 and the photograph of FIG. 5, the movement of the hose 1 (rubber layer) due to caulking can be clearly confirmed by the plurality of photographed copper wires 5.

<Analysis process>
The movement of the hose 1 inside the caulking is read from the image taken with the internal image photographing device before the caulking and the image taken with the internal image photographing device after the caulking, and the movement of the hose 1 is reproduced by CAE. The CAE analysis conditions are corrected. Thereby, the analysis precision of the hose behavior by CAE can be raised. Thereafter, hose behavior analysis by CAE is performed under the modified analysis conditions.

  In addition, the movement of the hose 1 inside the caulking read from the image photographed by the internal image photographing device is not reflected in the CAE, that is, the hose behavior analysis by the CAE is not performed, and the hose 1 and the fitting 2 are directly connected. You may use for the examination of the caulking shape optimization. It should be noted that the movement of the hose 1 inside the caulking read from the image photographed by the internal image photographing device can also be applied to a study for preventing in advance the problem of caulking between the hose 1 and the fitting 2.

(Action / Effect)
According to the present invention, a behavior marker (for example, a copper wire 5) that follows the behavior of the hose 1 is arranged inside the portion of the hose 1 that is inserted into the fitting 2, and this behavior is arranged inside the hose 1. The behavior of the hose 1 inside the caulking can be actually confirmed by photographing the marker together with the fitting 2 and the hose 1 with the internal image photographing device.

  Here, it is preferable to use a metal wire as the behavior marker, and it is more preferable to use a copper wire. Although fiber yarn impregnated with paste-like metal powder (metal paste) can be used as a behavior marker or the metal paste itself can be used as a behavior marker, the metal wire is denser than the metal paste. The internal image capturing device can capture a clearer image. Therefore, it is preferable to use a metal wire as the behavior marker. Moreover, since a copper wire is a metal wire which is easy to deform | transform among various metal wires, it can prevent that the movement marker hinders the movement of the hose 1 by using a copper wire as a behavior marker. . If the stainless steel wire is used as the behavior marker, the movement of the hose 1 is not inhibited, but the movement of the hose 1 is inhibited even if the stainless wire is used by reducing the diameter of the stainless steel wire. There is no.

  Moreover, in the marker arrangement step, it is preferable to use a needle-like cylinder as described above. When using a metal wire as the behavior marker, it is preferable to use a metal wire with a small wire diameter in order not to hinder the movement of the hose 1 with the behavior marker, but a metal wire with a small wire diameter is likely to be bent, It is difficult to pierce a metal wire having a small wire diameter directly into the hose 1 from the outer surface to the inner surface. That is, in the marker arrangement step, this trade-off problem can be solved by using a needle-like cylinder.

  In the imaging process, it is preferable to use an X-ray CT apparatus as the internal image imaging apparatus. This is because the X-ray CT apparatus is less expensive than the MRI apparatus.

1: Hose 2: Mouth fitting 3: Socket 4: Nipple 5: Copper wire (behavior marker)

Claims (5)

A method for confirming the behavior of the hose inside the caulking when the fitting with the hose is caulked,
A marker placement step of placing a behavior marker that follows the behavior inside a portion of the hose that is inserted into the fitting.
A hose insertion step of inserting the hose in which the behavior marker is disposed inside the fitting,
Before and after caulking the fitting with the hose inserted, the behavior marker placed inside, together with the fitting and the hose, a photographing step of photographing with an internal image photographing device;
A method for confirming hose behavior inside caulking, comprising: In the caulking internal hose behavior confirmation method according to claim 1,
Using a metal wire as the behavior marker,
In the marker placement step,
From the outer surface of the portion of the hose that is inserted into the fitting, into the inside of the hose, a needle-like cylinder is inserted,
After inserting the metal wire into the inserted cylinder, the cylinder is removed from the hose,
Then, cut off the portion of the metal wire that protrudes from the hose,
A method for checking hose behavior inside caulking. In the caulking internal hose behavior confirmation method according to claim 2,
A copper wire is used as the metal wire, and the hose behavior confirmation method inside the caulking is characterized. In the caulking internal hose behavior confirmation method according to any one of claims 1 to 3,
An x-ray CT apparatus is used as the internal image capturing apparatus. In the caulking internal hose behavior confirmation method according to any one of claims 1 to 4,
The movement of the hose inside the caulking is read from the image photographed by the internal image photographing device before the caulking and the image photographed by the internal image photographing device after the caulking, so that the movement is reproduced by the CAE. A method for confirming hose behavior inside caulking, further comprising an analysis step of correcting the analysis conditions and performing hose behavior analysis by CAE under the modified analysis conditions.