JPS61228192A - Mouthpiece for hose and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hose fitting and a method for manufacturing the same. More specifically, the present invention relates to a hose fitting for a high-pressure hose used in a hydraulic circuit and a method for manufacturing the same.

[Prior Art] It is customary to connect the ends of high-pressure hoses for hydraulic circuits through appropriate hose fittings. A hose cap fitting that is often used is an outer cylinder constriction type hose cap fitting.

The outer cylinder constriction type hose fitting consists of a threaded part, a hexagonal part, a socket part, and a nipple part. After the hose is inserted between the nipple part and the socket part, it can be fixed by compressing and caulking the socket part.

This external cylindrical drawing type hose cap fitting is manufactured using an all-cut manufacturing method in which a metal rod is cut, and the fitting main body consisting of a threaded part, hexagonal part, and socket part is made by cutting, and then separately cut at a predetermined position on the inner surface. Three manufacturing methods are mainly used: a welding manufacturing method in which the nipple part made by processing is welded together. In response to these problems, the present inventors have recently proposed a retroactive deformation manufacturing method in which the nipple is integrated into the metal fitting main body by retroactive deformation instead of the welding manufacturing method.

Table 1 compares the advantages and disadvantages of these manufacturing methods.

As can be seen from Table 1, the all-cutting manufacturing method has the drawback that the metal material is selected with machinability as the main focus, so that the nipple is easily crushed due to material cracking or the like. Since the cutting process is narrow and has poor visibility, uneven thickness tends to occur.Furthermore, since the entire process is performed by cutting, manufacturing costs are high.

A feature of the all-cut manufacturing method is that the fitting body and nipple are integrated, so airtightness is good.

On the other hand, in the welding manufacturing method, the nipple is easily crushed because it undergoes thermal history and is annealed during welding.

On the other hand, the retrodeformation manufacturing method improves nipple crush resistance.

Although it is excellent in three respects: preventing uneven thickness of the nipple and manufacturing cost, the problem is that the fitting body and the nipple are fixed due to retrograde flow, so the airtightness of the joint is not perfect.

For this reason, there is a concern that high-pressure oil will penetrate into the joints and weaken them mechanically.

[Problems to be Solved by the Invention] The present invention has been made based on this point, and its purpose is to solve the problem of nipple collapse.

To provide an inexpensive hose fitting that is free from uneven nipple thickness and airtight leakage.

[Means to solve the problem J The gist of the present invention is a threaded part and a hexagonal part.

In a hose capping fitting in which a nipple member is fixed to a capping body consisting of a socket portion by a retrograde flow method, a low melting point metal material layer is provided at the bonding interface between the capping fitting body and the nipple member. A hose fitting and threaded part characterized by comprising:

The main body of the fitting consists of a hexagonal part and a socket part,
In a method for manufacturing a hose fitting in which a nipple member is fixed by a retrograde flow method, a low melting point metal material layer is provided on the fitting body or the joint portion of the nipple member, and after the nipple member is fixed by a retrograde flow method, the fixed joint is performed. A method of manufacturing a hose fitting, characterized by heat-welding parts.

In the present invention, carbon steel for mechanical structures, such as 5IQC to 820C, is used as the material for the cap body. In addition, the material of the nipple member 4 is a hard metal material that is hard to crush, such as chromium molybdenum steel SCM430.
, 845C carbon steel for mechanical structures, etc. can be used. The low melting point metal material may be any material that melts at a temperature lower than the melting point of the fitting body or nipple member and can withstand high pressure during use, such as silver solder, brass solder, and solder.

Tin, lead, etc. can be used. In order to form these low melting point metal material layers on the fitting body or the joint part of the nipple member, there are various methods of applying these low melting point metal material pastes, plating with a low melting point metal material plating solution, and low melting point metal material 11M13 coating methods. There are methods such as pasting. The thermal welding method for these low-melting point metal materials involves local heating using a heater.

Local heating using micro burners, heating in a furnace, etc. are available. The heating atmosphere may be air, but depending on the case, the heating may be performed in a reducing gas atmosphere or an inert gas atmosphere.

[Function] The function of the present invention is to fix the low melting point metal material layer formed on the joint part of either the mouth fitting body or the nipple member of the joint part, or both, by the retrograde flow method, and then By heating and melting the low melting point metal material layer at the joint, the airtightness of the joint can be significantly improved, and
This is because the characteristics of the hose cap fitting manufactured by If-built using the retrograde flow method are effectively exhibited.

[Example] Next, an example of the hose cap fitting of the present invention and its manufacturing method will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the hose fitting of the present invention, and FIG. 2 is a partially enlarged explanatory view of FIG. 1.

In Figures 1 and 2, 1 is a threaded part, 2 is a hexagonal part,
3 is a socket part, 4 is a nipple member, 5 is a tube expansion part, 20
2) is a groove portion, 2) is a retrodeformation portion, 22 is a processed deformation surface, and 24 is a low melting point metal material layer.

The main component of the nipple member 4 is a hollow vibrator, and the end side connected to the metal main body is an expanded tube portion 5.

To manufacture the hose fitting shown in Fig. 1, first, the threaded part 1
．． Hexagonal part 2. The cap body is made of a socket member and has a groove 20 on the inner surface, and is made by cutting the entire body. Next, a straight hollow nipple material is cut from the vibrator material, a tube expansion jig is inserted into one end of the nipple material, and the tube is expanded by pressing to create the nipple member 4. Then, silver solder paste is applied to the expanded tube portion 5 of the nipple member 4. Next, the enlarged tube part 5 of the nipple member 4 is fitted into the groove 20 of the cap body that was previously created, and then the pressurized deformation surface 22 is strongly pressed with a pressurized deformation jig or the like to retroactively deform it. 23 is a retrodeformation groove formed by retrodeformation, and 2) is the retrodeformation part. Finally, the bonded portion that has been fixed due to retrograde deformation is heated with a micro burner to melt the silver solder and make the bonded portion airtight.

Although the embodiments of the hose cap fitting of the present invention and the manufacturing method thereof have been described above, these are merely examples, and the invention is not limited to these embodiments, and various modifications may be made within the scope of the claims of the present invention. It can be transformed.

[Effects of the Invention] According to the hose cap fitting and the manufacturing method thereof of the present invention, there is no problem of nipple collapse, and there is no uneven thickness of the nipple. is obtained and is industrially useful.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the hose cap fitting obtained by the hose cap fitting of the present invention and its manufacturing method, and FIG. 2 is a partially enlarged explanatory view thereof. 1: Threaded part, 2: Hexagonal part, 3: Socket part. 4: Nibble member, 20: Groove. 2): Retroactive deformation part, 22: Machining deformation surface. 23: Retrograde deformation groove, 24: Low melting point metal material layer. Agent Patent Attorney Fujio Sato @If! 1

Claims (2)

[Claims] (1) In a hose fitting in which a nipple member is fixed to a fitting body composed of a threaded part, a hexagonal part, and a socket part by a retrograde flow method, the joining interface between the fitting body and the nipple member A hose fitting characterized by being provided with a low melting point metal material layer. (2) In a method for manufacturing a hose cap fitting in which a nipple member is fixed to a cap main body composed of a threaded portion, a hexagonal portion, and a socket portion by a retrograde flow method, the joint portion of the cap fitting body or the nipple member is 1. A method for manufacturing a hose cap fitting, which comprises providing a low melting point metal material layer, fixing it by a retrograde flow method, and then heating and welding the fixed joint part.