JP2005186114A - Caulking die and caulking method for hose fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caulking die and a caulking method of hose fittings by which the roundness of the inside of an outer cylinder part is improved even when the thickness of the outer cylinder part of the hose fittings is comparatively thick. <P>SOLUTION: As regards the caulking die 1 of the hose fittings for fixing the hose main body which is inserted in the inside by caulking the outer cylinder part 2 of the hose fittings from the outside toward the center, a pressing surface 1A is made into a plane and the escaping place of deformation in the outer cylinder part is provided to the pressing surface 1A. By the caulking method of the hose fittings, the outer cylinder part 2 of the hose fittings is caulked with such a caulking die 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a crimping die for fastening an outer cylinder portion of a hose fitting from the outside toward the center and fixing a hose body inserted inside, and a method of crimping the hose fitting, The present invention relates to a caulking die and a caulking method for a hose fitting that can improve the roundness inside the tightening of a tube part.

  The hose fitting generally has an inner cylinder portion and an outer cylinder portion. To fix the hose body and the hose fitting, the hose fitting is inserted between the inner cylinder portion and the outer cylinder portion of the hose fitting. Thereafter, the outer cylinder portion is fixed by crimping with a crimping die.

That is, a plurality of caulking dies (for example, 8 or 6) are attached to the caulking device in a radial pattern. Then, a hose fitting with a hose body inserted is arranged near the center of each caulking die, and then the hoses are moved at the respective pressing surfaces of the caulking dies by moving the caulking dies toward the center. The hose main body is fixed by tightening the outer cylinder part of the metal fitting from the outside (8-way fastening or 6-way fastening) and reducing the diameter of the outer cylinder part (see, for example, Patent Document 1).
JP-A-11-207540 (FIG. 1)

  FIG. 2 is a diagram illustrating a conventional hose fitting crimping die and a hose fitting crimping method. Here, FIG. 2 (A) is a front view of a conventional crimping die. FIG. 2 (B) is a diagram showing a situation when a thin outer cylinder portion is crimped using the conventional crimping die shown in FIG. 2 (A), and FIG. These are figures which show the condition at the time of caulking a thick-walled outer cylinder part.

  As shown in FIG. 2A, the pressing surface 10A of the conventional crimping die 10 is a curved surface. This is adapted to the shape of the outer cylinder part 2 of the hose fitting, and after the hose body is swaged and fixed, the inner and outer surfaces of the outer cylinder part 2 are made to have a circular shape in cross section. It is taken into consideration.

  However, as shown in FIGS. 2B and 2C, each caulking die 10 is attached to the caulking device with a gap therebetween so that it can move toward the center. ing. Therefore, when each caulking die 10 is moved toward the center, the outer surface of the outer cylinder portion 2 of the hose fitting resists the tightening of each caulking die 10, and the gap between the caulking dies 10. Try to get into.

  In addition, the behavior of the inner surface of the outer cylinder portion 2 of the hose fitting varies depending on the thickness of the outer cylinder portion 2. That is, when the outer cylinder part 2 is thin, it is going to enter into the clearance between the caulking dies 10 like the outer surface of the outer cylinder part 2. Therefore, as shown in FIG. 2B, the cross-sectional shape of the inner surface of the outer cylinder portion 2 is not a perfect circle. In this case, the roundness can be improved by reducing the gap between the caulking dies 10.

  On the other hand, when the outer cylinder part 2 is thick, the outer surface of the outer cylinder part 2 can hardly enter the gap between the caulking dies 10. Therefore, on the contrary, the inner surface of the outer cylinder part 2 is pushed toward the center, and the cross-sectional shape of the inner surface of the outer cylinder part 2 is not a perfect circle as shown in FIG. In this case, since the gap between the caulking dies 10 and the roundness are irrelevant, the roundness is not improved even if the gap is reduced.

  Therefore, the present invention provides a hose fitting crimping die and a hose fitting that can improve the roundness of the inner surface of the outer cylinder portion even when the outer cylinder portion of the hose fitting is relatively thick. The object is to provide a caulking method.

  The present invention has been made in order to solve the above-mentioned problems. The first gist of the present invention is to fasten the outer cylinder portion of the hose fitting from the outside toward the center and fix the hose body inserted inside. This invention relates to a crimping die for crimping a hose fitting in which at least a pressing surface of the crimping die for tightening the outer cylinder part is provided with a clearance for deformation of the outer cylinder part. Preferably, the present invention relates to a caulking die for a hose fitting having a flat pressing surface.

  The second gist of the present invention is that the hose body is inserted inside the outer cylinder part of the hose fitting, and the outer cylinder part is directed from the outside to the center by the pressing surfaces of a plurality of caulking dies provided radially. Clamping of the hose fittings to fasten the hose fittings to fix the hose body by tightening the outer cylinders with a caulking die provided with at least a pressing surface with a clearance for deformation of the outer cylinders It concerns the method. Preferably, the present invention relates to a method for caulking a hose fitting in which the outer cylinder portion is tightened with a caulking die having a flat pressing surface.

  According to the caulking die of the hose fitting of the present invention and the caulking method of the hose fitting, since at least the pressing surface of the caulking die for fastening the outer cylinder part is provided with an escape area for deformation of the outer cylinder part, Even when the thickness of the outer cylinder part of the hose fitting is relatively thick, the roundness of the inner surface of the outer cylinder part can be improved.

Hereinafter, the die for crimping the hose fitting and the method for crimping the hose fitting according to the present invention will be described in detail with reference to the drawings while comparing with the prior art.
FIG. 1 is a view showing a crimping die for a hose fitting and a method for crimping a hose fitting according to the present invention, and FIG. 1 (A) is a front view of the crimping die according to the present invention. (B) is explanatory drawing of the method of caulking a thick-walled outer cylinder part using the caulking die of this invention shown to FIG. 1 (A).

  As shown in FIG. 1 (B), eight crimping dies 1 of the present invention shown in FIG. 1 (A) are normally attached radially to a commonly used crimping device, and hose fittings. The hose body is fixed by tightening the outer cylinder part 2 from the outside in eight directions and reducing the diameter of the outer cylinder part 2. In addition to the eight-sided fastening, it can be applied to a caulking die such as a six-sided fastening.

  Here, as shown in FIG. 1 (A), the crimping die 1 of the present invention has a flat pressing surface 1A for tightening the outer cylinder portion 2. That is, as is apparent from comparison with the conventional caulking die 10 shown in FIG. 2A, the pressing surface 10A that has been a curved surface in accordance with the shape of the outer cylinder portion 2 is conventionally shown in FIG. In the caulking die 1 of the present invention shown in FIG.

  When such a caulking die 1 of the present invention is used, the inner surface of the outer cylinder part 2 is centered by the flat pressing surface 1A even if the relatively thick outer cylinder part 2 is tightened from the outside toward the center. No longer being pushed toward Therefore, as shown in FIG. 1B, the roundness of the inner surface of the outer cylinder portion 2 is improved.

  As described above, the reason why the roundness of the inner surface of the outer cylindrical portion 2 is improved is not necessarily clear, but both end portions of the pressing surface 1A not initially in contact with the outer cylindrical portion 2 are the escape places for deformation of the outer cylindrical portion 2. It is considered to be.

  That is, in the conventional caulking die 10 shown in FIG. 2A, when the outer cylinder part 2 is thick, even if the outer cylinder part 2 is deformed, the outer surface thereof is the caulking die. It is almost impossible to enter the gap between the ten. For this reason, as shown in FIG. 2C, the inner surface of the outer cylinder portion 2 is pushed toward the center.

  However, in the caulking die 1 of the present invention shown in FIG. 1 (A), since the pressing surface 1A is a flat surface, both end portions of the pressing surface 1A not in initial contact with the outer cylindrical portion 2 become gaps. Yes. Therefore, even if the outer surface of the outer cylinder portion 2 cannot enter the gap between the caulking dies 1, it can escape to both ends of the pressing surface 1 </ b> A. Therefore, even if the outer cylinder part 2 is tightened from the outside toward the center, the inner surface of the outer cylinder part 2 is not pushed toward the center, and the roundness is considered to be improved.

  In the above caulking die 1, the pressing surface 1 </ b> A is a flat surface, and both sides of the outer cylindrical portion 2 that are not initially in contact with the outer cylindrical portion 2 are provided with escape areas for deformation, but the pressing surface 1 </ b> A is not a flat surface. Even in this case, it is possible to provide a place for the deformation of the outer cylinder portion 2. For example, although the center portion of the pressing surface 1A is a curved surface, both ends may be chamfered with a curve or a straight line so as to be a refuge. On the other hand, an escape space for deformation of the outer cylinder portion 2 may be provided by providing a recess or the like in the central portion of the pressing surface 1A.

  As explained above, according to the hose fitting crimping die and the hose fitting crimping method of the present invention, even if the outer cylinder portion of the hose fitting is relatively thick, the outer cylinder portion The roundness of the inner surface of can be improved. As a result, the stress acting on the hose body becomes uniform, and the hose body can be stably held.

  Further, the holding power of the hose body by the hose fitting and the sealing power against the internal fluid of the hose body are improved. Further, it is possible to effectively prevent the reinforcing layer of the hose body from being cut during caulking. Furthermore, problems such as bulges that tend to occur when the hose body is used can be prevented.

  In other words, the improvement of the hose fitting has been conventionally taken to improve the sealing force and prevent the reinforcing layer from being cut or bulged. However, according to the hose fitting crimping die and the hose fitting crimping method of the present invention, these measures can be taken without improving the hose fitting. This eliminates the need for repeated tests using various hose fittings, shortening the evaluation time, improving productivity and economy, and stabilizing the quality.

  According to the hose fitting crimping die and the hose fitting crimping method of the present invention, the roundness of the inner surface of the outer cylinder portion is increased even when the thickness of the outer cylinder portion of the hose fitting is relatively thick. And the hose body can be stably held. Therefore, it can be widely used as a caulking die for various hose fittings, and can be widely applied to a caulking method for various hose fittings.

It is a figure which shows the die for crimping of a hose metal fitting, and the caulking method of a hose metal fitting. (Example) It is a figure which shows the die for crimping of a hose metal fitting, and the caulking method of a hose metal fitting. (Conventional example)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crimping die 1A Pressing surface of caulking die 2 Outer cylinder part of hose metal fitting 10 Crimping die 10A Pressing surface of caulking die

Claims (4)

  A hose fitting (1) for tightening an outer cylinder part (2) of a hose fitting from the outside toward the center and fixing a hose body inserted inside, and at least the outer cylinder part (2) is tightened A crimping die for a hose fitting, characterized in that a pressing surface (1A) of the crimping die (1) is provided with a clearance for deformation of the outer cylinder (2).   The pressing die (1A) of the crimping die (1) is a flat surface.   The hose body is inserted inside the outer cylinder part (2) of the hose fitting, and the outer cylinder part (2) is centered from the outside by the pressing surfaces (1A) of the plurality of crimping dies (1) provided radially. The hose fitting is a method of crimping a hose fitting to fix the hose body, and at least a pressing surface (1A) is provided with a crimping die (1) provided with an escape area for deformation of the outer cylinder (2). A method for caulking a hose fitting, wherein the outer tube portion (2) is tightened. 4. The method for caulking a hose fitting according to claim 3, wherein the outer cylinder part (2) is tightened with a caulking die (1) having a flat pressing surface (1A).

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