JPH0366550B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel hose fitting for a high-pressure hose and a method for manufacturing the same.

[Conventional technology]

Hose cap fittings are used at the mounting terminals of industrial hoses because of their ease of use, ease of attachment and detachment, leakage prevention, and reliability.

These hose cap fittings are manufactured from steel, copper alloy, aluminum alloy, etc., and generally consist of a hose fitting body, a threaded portion, a socket portion, a nipple portion, etc. Here, the threaded portion is generally classified as being included in the hose fitting body.

In manufacturing a hose cap fitting, the main body portion of the hose fitting including the threaded portion is relatively easy to process.

On the other hand, machining the socket portion and the nipple portion is extremely difficult because they have a two-stage hollow structure.

Particularly, when a hose fitting is manufactured entirely from the constituent metal materials by cutting, the process is extremely troublesome.

Therefore, generally the hose fitting body, socket member, nipple member, etc. are cut and processed separately.
Methods such as manufacturing by cold forging, drawing, etc., and manufacturing these members by welding, gluing, or caulking are adopted.

However, such conventional manufacturing methods have the following drawbacks.

First, in a manufacturing method in which all of the constituent metal materials are cut, the cutting of the metal material is wasted, and the cutting is difficult, resulting in poor dimensional accuracy and productivity.

The method of separately processing the hose cap parts and welding these parts has disadvantages in that welding workability is poor, productivity is poor, and the reliability of the welded part is not sufficient. The method of bonding processed parts with adhesive has poor adhesive strength and heat resistance.
It has little practicality.

In the method of manufacturing processed parts by caulking, spring back occurs in the caulked part, making it difficult to maintain tension over a long period of time, and when used as a hose fitting, fluid that moves within the hose is likely to leak. There are drawbacks.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hose fitting and a method for manufacturing the same, which eliminate the drawbacks of the prior art described above and allow a socket member, a nipple member, etc. to be quickly and strongly fixed to a hose fitting body.

[Means to solve the problem]

The gist of the present invention is the following two points.

(1) In a hose cap fitting that has a socket portion and a nipple portion in the hose cap fitting body, at least one side of the socket portion or the nipple portion has a plurality of circumferential grooves formed in the circumferential direction on the outer periphery of one end side. At least one side member of the socket member or nipple member is provided with a circumferential groove from one end thereof to a socket member provided on the hose fitting body for insertion and insertion. The circumference of at least one side member of the socket member or nipple member that is fitted into the corresponding groove of the ring-shaped groove or the ring-shaped groove for inserting the nipple member, and between the fitting portions thereof. Inside the directional groove, there is a groove formed by pressing the main body of the hose fitting around the ring-shaped groove for inserting the socket member or the ring-shaped groove for inserting the nipple member in the axial direction so strongly as to form a dent. A hose fitting characterized by being formed by flowing a plastic fluid metal into the hose fitting.

(2) In a method for manufacturing a hose cap fitting in which the hose cap fitting body has a socket portion and a nipple portion,
After providing a ring-shaped recessed groove into which at least one side member of the socket member or nipple member can be inserted in the hose fitting body, a circular groove is formed on the outer periphery of the side end to be inserted into the ring-shaped groove. At least one side member of a socket member or nipple member provided with a plurality of circumferential grooves formed in the circumferential direction is inserted, and the specific portion of the hose cap around the ring-shaped groove for subsequent insertion is inserted. Press strongly in the axial direction to create a dent to cause plastic flow in a direction perpendicular to the axial direction, and the plastic flow metal is inserted into and inserted into a circumferential groove on the outer periphery of at least one end of the socket member or nipple member. A method for manufacturing a hose fitting, characterized by allowing water to flow between the parts.

In the present invention, the inner diameter of the ring-shaped groove for inserting the socket member or the ring-shaped groove for inserting the nipple member provided in the hose fitting body is equal to or slightly larger than the outer diameter of the socket member to be inserted or the outer diameter of the nipple member. It is preferable. That is, these gaps are on the order of 0 to 0.5 mm, and preferably
0.01~0.10mm is suitable.

Of course, if these gaps are large, it is necessary to increase the pressure applied by the mold to increase the amount of plastic flow deformation around the ring-shaped groove.
On the other hand, when the gap is small, the amount of plastic flow deformation around the ring-shaped groove can be small, so the pressing force by the press can also be reduced.

In addition, the depth of the ring-shaped groove for inserting a socket or the ring-shaped groove for inserting a nipple provided on the hose fitting body is such that the socket member or nipple member can be inserted thereinto and fixed by plastic flow around the ring-shaped groove. The depth may be as long as it can be removed, and the depth is usually about several mm.

In the present invention, in order to generate shearing force and tension force by plastic flow around the ring-shaped groove on the outer periphery of the insertion side end of the nipple member to be inserted and fixed,
A plurality of circumferential grooves are provided. The appropriate number of grooves required is 1 to 5. That is, this is because the circumferential groove provides a stronger fixing force. Note that even if five or more circumferential grooves are provided, the fixing force does not increase in proportion to the number of circumferential grooves.

Moreover, the appropriate depth of this groove is 0.1 to 1.0 mm. That is, when the groove depth is 0.1 mm or less, the fixing force is small, and when the groove depth is 1.0 mm or more, it is necessary to increase the amount of plastic flow deformation.

Also, the appropriate groove angle is 60 to 130 degrees.

[Effect]

According to the hose cap fitting and its manufacturing method of the present invention, the following effects can be achieved.

a. Provide a ring-shaped groove for inserting the socket member, a ring-shaped groove for fitting the nipple member, or both a ring-shaped groove for inserting the socket member and a ring-shaped groove for fitting the nipple member on the hose cap. As a result, the hose fitting body, the socket member, the nipple member, etc. can be manufactured using materials that match their characteristics in an optimal manner with high quality, with little waste of material, and at low cost, and they can be inserted and inserted extremely easily. Can be fixed. Furthermore, since the present invention does not involve cutting or welding the entire structure, each component member can be manufactured from different materials such as ultra-hard materials with poor machinability and weldability. For example, chrome or molybdenum steel can be used for the nipple member, ceramic for the hose fitting body, and carbon steel for the socket member. Furthermore, each component can be individually given any surface treatment.

b By providing a plurality of circumferential grooves formed in the circumferential direction on the outer periphery of the insertion side end of a separately manufactured socket member or nipple member, the socket member provided on the hose fitting body can be fitted easily. After inserting into the ring-shaped groove for insertion or the ring-shaped groove for inserting the nipple member, respectively, insert the ring-shaped groove for inserting the socket member into the ring-shaped groove for inserting the socket member, the ring-shaped groove for inserting the nipple member, or the ring-shaped groove for inserting the socket member. By pressing the main body portion of the hose fitting around both the concave groove and the ring-shaped concave groove for inserting the nipple member in the axial direction strongly enough to form a concave, and causing the plastic fluid metal obtained to flow in,
The inflowing plastic fluid metal acts discontinuously and in multiple stages, thereby significantly improving the fixing force and fluid leakage prevention properties of the socket member or nipple member.

c. A ring-shaped recessed groove or nipple member for inserting the socket member into the circumferential groove on the outer periphery of the insertion side end of the inserted socket member or nipple member, or both, and between these insertion parts. Pressing the main body of the hose fitting around both the ring-shaped groove for insertion, the ring-shaped groove for inserting the socket member, and the ring-shaped groove for fitting and inserting the nipple member in the axial direction strongly enough to create a dent. By letting the metal flow plastically and allowing the plastic metal to flow in, the plastic metal exerts a strong shearing force and tensile force, and exhibits an extremely superior fixing force.Moreover, the socket member or nipple member has no mechanical It exhibits excellent mechanical strength because it does not undergo deformation,
Furthermore, since the main body of the hose fitting is only partially plastically fluidized to the extent of a slight depression, it exhibits excellent mechanical properties without any loss in mechanical strength.

As a result, a highly reliable hose cap fitting for a high-pressure hose can be manufactured easily and inexpensively by making these components act synergistically.

〔Example〕

Next, embodiments of the hose cap fitting of the present invention and its manufacturing method will be described with reference to the drawings.

First, a method of manufacturing a male hose cap will be described as an embodiment of the hose cap of the present invention and its manufacturing method with reference to FIGS. 1 to 5.

First, as shown in Fig. 1, a threaded part 1 is attached to one end of the hose fitting main body 2, a socket part 3 is attached to the other end,
A ring-shaped groove 20 for fitting the nipple member is formed on the inner surface of the hose fitting main body 2 inside the socket member 3.
Prepare a semi-finished hose fitting with a

Next, as shown in FIG. 2, a nipple member 22 having two circumferential grooves 21 formed in the circumferential direction on the outer periphery of the insertion side end is prepared.

Next, as shown in FIG.
The nipple member is inserted into the ring-shaped concave groove 20 for insertion.

Next, as shown in FIG.
The peripheral part of the hose fitting body 2 is pressed strongly in the axial direction to the extent that a dent is formed, the metal in the peripheral part of the hose fitting main body 2 is made to plastically flow in a direction perpendicular to the axial direction, and the plastically flowing metal is transferred to the nipple member 22. It flows into the circumferential groove 21 and between the fitting parts.

FIG. 5 shows a vertical half-sectional view of a male type hose fitting which is an embodiment of the present invention thus obtained. In FIG. 5, reference numeral 24 indicates the impression left by the pressing die 23. As shown in FIG. 5, the plastic fluid metal also flows between the fitting part between the nipple member fitting ring-shaped groove 20 and the circumferential groove 21 of the nipple member 2. Coupled with the circumferential grooves 21, it is possible to exert extremely superior shearing force and tension force, and to achieve strong fixation.

Next, other embodiments of the present invention will be described.

FIG. 6 shows an embodiment of a male hose fitting using a long nipple member 22, in which plastic flow is caused from two locations on both ends of the male hose fitting main body 2.

FIG. 7 shows an embodiment in which both the socket member 25 and the nipple member 22 are pressed onto the male ring fitting main body 2 from two places with the press die 23, thereby causing plastic flow and fixation.

Figure 8 shows the socket member 2 attached to the hose fitting body 2.
5. Press both of the nipple members 22 from one place with the mold 2
This is an example in which the material was plastically flowed and fixed by pressing with a pressure of 3.

Figure 9 shows the nipple member 22 on the glasses-type fitting body.
This is an example in which the steel is fixed by plastic flow.

Figure 10 shows the nipple member 2 on the female type fitting body.
2 is fixed by plastic flow.

FIG. 11 shows an embodiment in which the nipple member 22 is fixed to the irregularly shaped mouthpiece by plastic flow.

FIG. 12 shows that the irregularly shaped socket member 26 is fixed to the oblique head type fitting main body 7 by plastic flow, and
This is an embodiment in which the nipple member 22 is fixed to the irregularly shaped socket member 26 by plastic flow.

〔Effect of the invention〕

The hose cap fitting and the manufacturing method thereof of the present invention have the following excellent effects and are industrially useful.

(1) Each component can be manufactured using the most suitable method, there is little wasted material, and a highly reliable hose fitting can be manufactured at low cost.

(2) Since it is possible to select materials that match the characteristics and there is no need for cutting or welding, each component can be made of different materials. For example, hard materials such as chromium or molybdenum steel can be used for the nipple member, ceramics can be used for the hose fitting body, and carbon steel can be used for the socket member.

(3) Unlike those that are integrated by caulking, which involves plastic deformation, there is no spring baggage, and a highly reliable hose fitting that provides long-term tensioning force and no fluid leakage can be obtained.

(4) Since the production method is simple, component parts can be standardized.

(5) Each component can be individually subjected to any desired surface treatment.

(6) It is possible to provide hose fittings of excellent quality with small variations in dimensional accuracy and better stability in hardness compared to welded fittings.

(7) Since it is excellent in mass production, productivity can be improved several times compared to conventional production methods.

[Brief explanation of drawings]

1 to 5 show an embodiment of the method for manufacturing a hose cap fitting of the present invention, in which FIG. 1 is a longitudinal half-sectional view of a semi-finished male hose cap fitting, and FIG. 3 is a longitudinal half sectional view of the nipple member, FIG. 3 is a longitudinal half sectional view showing the nipple member of FIG. 2 inserted into the semi-finished male hose fitting of FIG. 1, and FIG. 5 is a longitudinal half sectional view of a male hose fitting obtained according to the present invention, and FIGS. 6 to 11 are longitudinal half sectional views of a hose fitting obtained according to other embodiments of the present invention. The cross-sectional views are shown. Figure 6 shows an example using a long nipple member, Figure 7 shows an example in which a socket member and nipple member are fixed by plastic flow from two points, and Figure 8 shows an example of a socket. An example in which a member and a nipple member are fixed by plastic flow from one point, Fig. 9 is an example of a spectacle-shaped fitting, Fig. 10 is an example of a female-type fitting, and Fig. 11 is an example of an irregularly shaped fitting. Examples of metal fittings, and FIG. 12 is a longitudinal sectional view showing an example in which an irregularly shaped socket member is fixed to a diagonal head opening fitting by plastic flow, and a nipple member is fixed to the irregular shaped socket member by plastic flow. be. 1: Threaded part, 2: Hose fitting body, 3: Socket part, 4: Bolt hole part, 5: Female fitting part, 6: Irregular fitting head, 7: Oblique head, 20: Nipple member insertion ring shaped groove, 21: circumferential groove, 22:
Nipple member, 23: Pressing mold, 24: Pressing part trace, 2
5: socket member, 26: irregularly shaped socket member.

Claims (1)

[Scope of Claims] 1. In a hose cap fitting having a socket part and a nipple part in the hose cap main body, at least one side of the socket part or the nipple part is formed in the circumferential direction on the outer periphery of one end side. It consists of a socket member or a nipple member provided with a plurality of circumferential grooves, and at least one side member of the socket member or the nipple member is connected to the hose fitting body from one end side having the circumferential groove. The socket member or the fitting is inserted into the corresponding groove of the provided ring-shaped groove for fitting and inserting a socket member or the ring-shaped groove for fitting and inserting a nipple member, and is inserted between the fitting portion and the inserted socket member or the fitting. In the circumferential groove of at least one side member of the nipple member, a recess is formed in the hose cap fitting main body portion of the ring-shaped groove for fitting and inserting the socket member or the ring-shaped groove for fitting and inserting the nipple member. A hose fitting characterized in that a plastic fluid metal obtained by pressing in the axial direction as strongly as possible flows into the fitting. 2. In a method of manufacturing a hose cap fitting in which the hose cap fitting body has a socket portion and a nipple portion, the hose cap fitting body is provided with a ring-shaped groove into which at least one side member of the socket member or the nipple member can be inserted. At least one of the socket member and the nipple member is provided with a plurality of circumferential grooves formed in the circumferential direction on the outer periphery of the side end portion to be inserted into the ring-shaped recessed groove for insertion. One side member is fitted and inserted, and then the main body portion of the hose cap fitting around the ring-shaped groove for fitting is strongly pressed in the axial direction to the extent that a dent is formed to cause plastic flow in the direction perpendicular to the axial direction, A method for manufacturing a hose cap fitting, characterized in that the plastic fluid metal is allowed to flow into a circumferential groove on the outer periphery of at least one end of the socket member or the nipple member and into the space between the fitting portions.