JPS6338268B2 - - 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 vehicles, machines, equipment, etc. as supply channels for various fluids and gases, and are also used when brazed at the end of relatively small metal pipes with a pipe diameter of approximately 30 m/m or less. It is widely used as a connecting end fitting that is fixed by welding or the like, and there is a demand for inexpensive supply due to its easy manufacture, improved productivity, and simple processing and processing equipment. In order to meet this demand, as proposed in Utility Model Publication No. 35-3402 and Special Publication No. 35-5357, etc., eye joints made of metal plate materials and their manufacturing methods are publicly known; , the risk of leakage caused by welding over a wide area over the entire circumference of the opposing mating surfaces of half-shaped members, or the limited risk of leakage caused by simply a plate with a through hole that does not have an integral branch pipe wall. Due to problems such as insufficient welding strength due to insertion welding with the end of metal piping on the thick wall surface of the hole, it is still in a state where it cannot be put to practical use, and therefore, it is hardly used as a conventional product. Currently, the products shown in FIG. 4 are widely available on the market.

That is, a metal rod shape or a large diameter metal 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 by header processing and subsequent cutting. A branch that extends through the bolt hole and has flat seating surfaces 12, 12' parallel to each other at the peripheral edges of the outer hole of the bolt hole, and further has a brazing hole 16 for connection with the end of the metal pipe in the peripheral side wall. The eye joint 11 was constructed by integrally protruding the pipe wall 15. 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, which inevitably reduces productivity. This had problems such as high manufacturing costs.

An object of the present invention is to provide an eye joint and a method for manufacturing the same, in which the above-mentioned problems are extremely effectively solved by a manufacturing method using press molding made of metal plate material. For example, a flat wall is left along the same side end of a parallel flat seating surface on both widthwise end surfaces, and a concave groove bulges toward one surface side in the longitudinal direction, and a flat wall is provided at both ends in the longitudinal direction. A strip plate piece made of a rectangular shape that has been previously formed by punching so as to have a semicircular groove that bulges on the same side as the concave groove while leaving an ear wall portion near the end, This device is characterized in that the mating wall surfaces formed by the ear wall portions of the main body, which is curved in a substantially C-shape with the concave groove side located on the inner circumferential side, are welded together.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3. In 1, both widthwise end surfaces obtained by punching by press molding are used as parallel flat seating surfaces 2 and 2'; And each flat seat surface 2,
A concave groove 4 bulges toward one surface side in the longitudinal direction, leaving flat walls 3, 3' along the same side edge formed by 2'.
Furthermore, the flat walls 3, 3' are provided at both ends in the longitudinal direction.
The groove 4 is formed leaving the ear wall portions 5, 5' near the ends of the groove 4.
A strip plate piece 1' made of a rectangle having semicircular grooves 6, 6' extending to the same side and bulging out on the same side is used as a material, and the concave groove 4 side is located on the inner circumferential side to form a substantially C-shape. The eye joint body is curved in shape, and has an ear wall portion 5,
The mutually mating wall surfaces of 5' are welded together with solder 7, 7'.

Examples of the present invention will be described below.

Material: SS34 Dimensions: width 20m/m, wall thickness 2.3m/m, flat wall
3.0m/m, concave groove (width) 14m/m,
(depth) 3.5m/m, groove (radius) 6
m/m.

Molding method: Punching using a press machine.

Curved forming method: At the same time, a press machine is used to bend the part located on the ear wall, and an annular curve is formed at the same time, followed by spot welding for temporary fixation on the mating surface of the ear wall. conduct.

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

As described above, according to the present invention, the wall is made of a metal plate material and has an integral structure having semicircular grooves 6, 6' corresponding to branch pipes, and is simply punched by press molding and then bent. Also, the curved molding process and the welding process 7, using only the mating surfaces of the ear walls 5 and 5',
7', it can be easily constructed, and the structure of soldering 7, 7' only on the mating surfaces reduces the risk of leakage as in the conventional product, and on the other hand, it is possible to reduce the risk of leakage as in the conventional product. The structure of the pair of circular grooves 6 and 6' not only significantly increases the strength of soldering to the end of the metal pipe at the connection hole, but also makes it easy to manufacture and extremely reduces the number of machining steps. Since it can be manufactured with a reduced amount, productivity can be significantly increased, and it can be manufactured at a low cost by using simple processing 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, 2, 2'...flat surface,
3, 3'...Flat wall, 4...Concave groove, 5,5'...Ear wall part,
6, 6'... Semicircular groove, 7, 7'... Solder welding.

Claims (1)

[Claims] 1. Both side end surfaces of the width are parallel flat seating surfaces 2, 2',
In addition, along the same end of each of the flat seating surfaces 2, 2', a groove 4 bulges toward one surface side in the longitudinal direction, leaving the flat walls 3, 3', and a groove 4 bulged toward one surface side in the longitudinal direction, and the groove 4 is formed at both ends in the longitudinal direction. an ear wall portion 5 that extends near the ends of the flat walls 3, 3';
A rectangular strip plate 1' having semicircular grooves 6, 6' extending to the same side and extending to the groove 4 except for the groove 5' is used as a material. A metal plate material characterized in that the mutually mating wall surfaces of the ear wall portions 5, 5' of the main body 1, which are located on the sides and curved in a substantially C-shape, are welded together 7, 7'. Eye joint made from. 2 A rectangular strip piece 1' is punched out in advance to form parallel flat seating surfaces 2, 2' on both widthwise end surfaces.
and a concave groove 4 that bulges out on one surface side in the longitudinal direction, leaving the flat walls 3, 3' along the same side edge formed by each of the flat seating surfaces 2, 2', and both ends in the longitudinal direction. semicircular grooves 6, 6' extending to the same side and extending to the groove 4, leaving ear wall portions 5, 5' near the ends of the flat walls 3, 3'; Then, by using the strip piece, the groove 4 side is positioned on the inner peripheral side and curved into a substantially C shape, and then the ear wall portions 5, 5' The mating wall surfaces formed by the grooves 6 and 6' are heated and welded 7 and 7', and the pair of connecting holes formed by the grooves 6 and 6' are drilled as necessary. A method for manufacturing eye joints using metal plate materials.