JPS6338267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to improvements in an eye joint made of a metal plate material and a method for manufacturing the same.

Such eye joints are generally installed in large numbers in vehicles, machines, equipment, etc. as supply paths for various fluids and gases, and are soldered at the ends of relatively small metal pipes with a pipe diameter of approximately 30 m/m or less. It is used in large quantities as a connecting end fitting that is fixed by welding, etc. Because it is used in large quantities, it can be easily manufactured and productivity can be improved, and it can be supplied at low cost due to simple processing equipment. The current situation is that there is a demand for this. In order to meet this demand, Japanese Utility Model Publication No. 3402/1982 and Japanese Patent Publication No. 5357/1987 have been proposed, which introduce an eye joint made of a metal plate material and a method for manufacturing the same. However, the products disclosed in these publications have a high risk of leakage due to welding over a wide range around the entire circumference of the facing surfaces of half-shaped members.
Or, it is related to the problem of insufficient welding strength due to insertion and welding with the end of metal piping in the limited wall thickness around the hole of a plate material that is simply a through hole that does not have a branch pipe wall integrally. However, it was still in a state where it could not be put to practical use. Therefore, as a conventional product, the one illustrated in FIG. 4 is currently widely available on the market. That is, a metal rod or a metal large-diameter wire material is used as a material, and the assembly bolt holes 14 are concentrically formed in the annular groove 13 provided inside by cutting, or header processing and subsequent cutting. through the bolt hole 1, and the bolt hole 1
The circumferential edges of the outer holes of No. 4 are made into mutually parallel flat seating surfaces 12 and 12', respectively, and a branch pipe wall 15 having a brazing hole 16 for connection with the end of the metal pipe is integrally protruded on the circumferential side wall. It was set up to form Eye Joint 11.

However, due to the structure of the eye joint 11 created by the above-mentioned processing method, the manufacturing process becomes complicated and requires a large number of processing steps, resulting in a significant reduction in productivity. This naturally led to problems such as high manufacturing costs.

The purpose of the present invention is to solve this problem by using press molding made of metal plate material.
By providing an extremely effectively solved eye joint and a method for manufacturing the same, the present invention makes it possible to form parallel flat seating surfaces on both widthwise end surfaces by punching in advance, and to form parallel flat seating surfaces on the same side formed by the respective flat seating surfaces. A concave groove that bulges out on one surface side in the longitudinal direction leaving a flat wall along the end, and a notch leaving a beam wall near the end of the flat wall at both longitudinal ends. The material is a rectangular band plate piece with a hole, and the band plate piece is further curved into a C-shaped cross section with the concave groove side positioned on the inner circumferential side,
Thereafter, the mutually mating wall surfaces formed by the beam wall portions are heated and welded to obtain an eye joint,
It is inexpensive and easy to manufacture, reduces the occurrence of leakage,
Furthermore, processing equipment can be simplified.

The present invention will be described in detail with reference to FIGS. 1 to 3 below. A rectangular strip piece 1' used as a material is
It is formed in advance by punching using press molding so that the end surfaces on both sides of the width become parallel flat seating surfaces 2, 2',
and extending in the longitudinal direction, leaving flat walls 3, 3' along the same side ends of the respective flat seating surfaces 2, 2',
The notch holes 6, 6' are formed by leaving the concave groove 4 bulging out on one surface side and the beam walls 5, 5' which extend near the ends of the flat walls 3, 3' at both ends in the longitudinal direction. The strip plate piece 1' is curve-molded into a C-shaped cross section with the groove 4 side located on the inner circumferential side to form the eye joint main body 1, and the mutual alignment formed by the beam walls 5, 5' is The wall surface is constructed by welding 7, 7'.

Examples of the present invention are as follows.

Material: Material…SS34 Dimensions…width 20m/m, wall thickness 2.3m/m, flat wall
3.0m/m, groove (width) 14m/m, groove (depth) 3.5m/m, cutout hole (radius)
6m/m Forming method: Punching using a press machine Curved forming: Method: Simultaneous annular curving process is performed with the bending process on the part located on the beam wall using a press machine, and then temporarily fixed on the mating surface of the beam wall. Temporarily attach by spot welding.

Brazing welding: Method: Welding is performed in a brazing furnace using a paste-like copper brazing material.

Hole adjustment processing: method... drilling processing As described above, according to the present invention, in order to make the beam wall portions 5, 5', which correspond to branch pipes, into an integral structure using a metal plate material, a simple punching process using press molding is performed. The eye joint can be easily constructed by the subsequent bending and curving forming process, soldering only on the mating surfaces of the beam walls 5 and 5', and then the hole adjustment process at the connecting hole portion as necessary, In addition, the structure of the beam walls 5, 5' which are soldered only on the mating surfaces 7, 7' reduces the occurrence of leakage as in the conventional product, and furthermore, the structure of the beam walls 5, 5' made of one piece reduces the occurrence of leakage as in the conventional product. This not only significantly increases the strength of soldering between the connection hole and the end of the metal pipe, but also significantly increases productivity as it can be manufactured simply and with an extremely reduced number of machining steps. As a result, it can be manufactured at low cost by using simple equipment.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an eye joint made of a metal plate material and a manufacturing method thereof according to an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. FIG. 1 is a side view of the material after punching, and FIG. 4 is a partially cutaway cross-sectional view showing the state of connection by a conventional eye joint. 1...eye joint body, 1'...band plate piece, 2,
2'...Flat seat surface, 3,3'...Plane wall, 4...Concave groove,
5, 5'... Beam wall part, 6, 6'... Notch hole, 7, 7'
...Zui welding.

Claims (1)

[Scope of Claims] 1. Both side end surfaces of the width are formed into parallel flat seating surfaces 2, 2', and flat walls 3, 3' are formed along the same side edges formed by the respective flat seating surfaces 2, 2'. A concave groove 4 extending in the longitudinal direction and bulging toward one surface side, leaving a groove 4 extending along the longitudinal direction, and beam walls 5, 5' extending near the ends of the flat walls 3, 3' at both ends in the longitudinal direction. The beam wall 5 of the main body 1 is constructed by bending a rectangular band plate piece 1' provided with cut holes 6, 6' into a C-shaped cross section with the groove 4 side positioned on the inner circumferential side. , 5' are formed by welding together the mutually mating wall surfaces 7, 7' of the eye joint made of metal plate material. 2. Using a rectangular strip piece 1', punch this strip piece in advance to form flat seat surfaces 2, 2' with parallel width side end surfaces, and also form the respective flat seat surfaces 2, 2'. A concave groove 4 bulges toward one surface side in the longitudinal direction, leaving the flat walls 3, 3' along the same side edges formed by the grooves 4, and the ends of the flat walls 3, 3' at both ends in the longitudinal direction. Beam wall 5 with surrounding area,
Processing is performed to provide notch holes 6, 6' while leaving 5', and further, the strip piece is curved into a C-shaped cross section with the concave groove 4 side positioned on the inner circumferential side, After that, the mutual mating wall surfaces formed by the beam walls 5 and 5' are heat-soldered, and if necessary, a connecting hole is formed with a pair of the notch holes 6 and 6'. A method for producing an eye joint made of a metal plate material, characterized in that the eye joint is formed by applying