JPH0237808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing can handles used for oil cans, paint cans, drinking water cans, and the like.

[Conventional technology]

Conventional can handles of this kind are used for cans by bending the handle material into a substantially trapezoidal shape with both free ends facing each other, but when the contents of the can are heavy, There was a risk that the free end of the hand would open and the can would fall.

For this purpose, as shown in Figure 2 of Japanese Utility Model Application Publication No. 52-62260, both free end surfaces of a substantially trapezoidal hand material are brought into full contact with each other, and a current is passed through this contact area to melt the material, and both free ends are melted. We devised a method for manufacturing a can handle by welding the edges, but since both free end surfaces were simply in full contact, the current density per unit area of the current flowing through the contact area was small, and The contact pressure per unit area applied from both sides was also small, requiring a very long time for welding, and moreover, highly reliable welding could not be obtained. For this reason, it has not been widely adopted.

Therefore, as shown in Figure 3 of Publication No. 52-62260, both free end surfaces of a substantially trapezoidal hand material are cut diagonally opposite to the axis of both free end sides, and the tip We have devised a method for manufacturing a can handle in which the parts are brought into partial contact and a current is applied to the contact parts to melt them and weld the free ends together.

[Problem to be solved by the invention]

However, in this conventional method for manufacturing can handles, both free end surfaces of a substantially trapezoidal handle material must be cut obliquely to the opposite side to the axis of both free end sides. When cutting the handle material from a long cylindrical wire material, a large amount of material is wasted, and it is very troublesome in manufacturing to bend the tips of both cut free end surfaces into a substantially trapezoidal shape so that they match. There was the problem of becoming something. In other words, when cutting a long linear cylindrical wire material with a cutting surface that slopes to the opposite side using a press die, it is necessary to use a press die with a certain width in consideration of the life of the press die. Therefore, a portion of the wire material must be removed during use, resulting in a large waste of material being removed. In addition, after cutting a straight hand material with a cutting surface that slopes to the opposite side from a long straight cylindrical wire material, the hand material rotates when being transported to the next bending process into a substantially trapezoidal shape. It must be fixed to prevent
This was extremely troublesome to manufacture and caused a decline in production. For this reason, this manufacturing method has not yet been widely adopted.

[Means to solve the problem]

The present invention is a method devised to solve this problem, in which a long linear cylindrical wire material is cut perpendicularly to its axial direction to form a hand material 1 having free end surfaces 1a' at both ends. After that, the hand material 1 is bent into a substantially trapezoidal shape so that both free end surfaces 1a' thereof face each other, and the axes 1' of both free end sides 1a intersect at an extremely small angle α to form 1a' is deformed so that only a portion thereof contacts, and while pressing both free end sides 1a from both sides, the electrode 2 is brought into contact near both free end surfaces 1a' of both free end sides 1a, and the power source 3 is A current is caused to flow between the two electrodes 2 through the free end sides 1a and their contact portions 1a'', so that the free end surfaces 1
In this method, a can handle is manufactured by melting a contact portion 1a'' of a' and forming a welded portion 1a'' between both free end sides 1a.

[Effect]

According to this method of manufacturing a can handle, a handle material 1 is produced by cutting a long linear cylindrical wire material perpendicularly to its axial direction and having free end surfaces 1a' at both ends.
, so it can be simply cut using a press mold, and there is no need to remove any part of the material. Therefore, no material is wasted. In addition, both free end surfaces 1 are cut perpendicularly to the axial direction of the wire material.
Since the handle material 1 having the shape a' is bent into a substantially trapezoidal shape and both free end surfaces 1a' thereof are opposed to each other, there is no need to prevent rotation when transporting the handle material 1 to the process of bending it into a substantially trapezoidal shape. , manufacturing becomes very easy, and
Productivity can be improved. Furthermore, the axes 1a'' of both free end sides 1a of the hand material 1 are deformed so that they intersect at an extremely small angle α, and only a portion of both free end surfaces 1a' contact each other, and both sides of both free end sides 1a While pressing from the
and connect both free ends 1 between both electrodes 2 from the power source 3.
a and its contact portion 1a'' to melt the contact portion 1a'' of both free end surfaces 1a' and form a welded portion 1a between both free end sides 1a, so that current flows through the contact portion 1a''. The current density per unit area of the current increases, and the contact pressure per unit area applied from both sides increases, which makes it possible to shorten the welding time and achieve highly reliable welding. In this case, a special mechanism is required in manufacturing to deform the axes of both free end sides 1a so that they intersect at an extremely small angle α and bring only a portion of both free end faces 1a' into contact. It is possible without saying.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. A hand material 1 having free end surfaces 1a at both ends as shown in FIG. 1 is formed by cutting a linearly long cylindrical wire material to a predetermined size perpendicular to its axial direction. Thereafter, the handle material 1 is bent into a substantially trapezoidal shape as shown in FIGS. 2 and 3, and its free end surfaces 1a' are opposed to each other with a slight distance _l1 between them. Next, push both free end sides 1a from both sides, Y
Both free ends 1a are centered around the point (see Figure 2).
as shown in FIG.
The axes 1' intersect at an extremely small angle α, and both free end faces 1a' are deformed so that only a part of them are in contact with each other. The electrode 2 is brought into contact near the end surface 1a'. In this state, a current is applied between both electrodes 2 from the power source 3 through both free end sides 1a and their contact portions 1a'' as shown by the dotted line arrows, and the contact portions 1a'' of both free end surfaces 1a' are melted. As shown in FIG. 5, a can handle is manufactured by welding between both free end sides 1a.

According to this method of manufacturing a can handle, a handle material 1 is produced by cutting a long linear cylindrical wire material perpendicularly to its axial direction and having free end surfaces 1a' at both ends.
, so it can be simply cut using a press mold, and there is no need to remove any part of the material. Therefore, no material is wasted, so manufacturing costs can be reduced. In addition, a handle material 1 having both free end surfaces 1a' cut perpendicularly to the axial direction of the wire material is bent into a substantially trapezoidal shape, and the both free end surfaces 1 are bent into a substantially trapezoidal shape.
Since a' are opposed to each other, there is no need to prevent rotation when transporting the handle material 1 to the process of bending it into a substantially trapezoidal shape, which greatly facilitates manufacturing and improves productivity. . Furthermore, the axial direction 1' of both free end sides 1a of the hand material 1 is at an extremely small angle α.
The electrodes 2 are deformed so that only a part of both free end surfaces 1a' are in contact with each other, and the electrodes 2 are brought into contact near both free end surfaces 1a' of both free end sides 1a while pressing from both sides of both free end sides 1a. , a current is passed between both electrodes 2 from a power source 3 through both free end sides 1a and their contact portions 1a'' to melt the contact portions 1a'' of both free end surfaces 1a', and both free end sides 1a are melted.
Since the welded part 1a is formed in between, the contact part 1
The current density per unit area of the current flowing through a'' becomes larger, and the contact pressure per unit area applied from both sides becomes larger, which makes it possible to shorten welding time and achieve high reliability. In this case, the axes of both free end sides 1a are deformed so that they intersect at an extremely small angle α, and only a part of both free end faces 1a' are brought into contact. This is possible without requiring any special mechanism.

〔Effect of the invention〕

According to the present invention, manufacturing costs can be reduced without wasting materials, manufacturing is easy and productivity can be improved, and in addition, welding time is short and reliability is high. It is possible to provide a method for manufacturing a can handle that can be welded.

[Brief explanation of drawings]

Figures 1 to 5 are diagrams explaining the method for manufacturing a handle for cans according to the present invention. Figure 1 is a plan view of the handle material cut from a wire material, and Figure 2 is a substantially trapezoidal shape. A plan view of the hand material folded into
FIG. 4 is an enlarged view of part A in the figure, FIG. 4 is an enlarged view of the hand material at the start of welding, and FIG. 5 is an enlarged view of the welded portion after the welding is completed. 1...handle material, 1a...free end side, 1a'...free end surface, 1a''...tangent part, 1a...welded part,
2... Electrode, 3... Power supply.

Claims (1)

[Claims] 1 After cutting a long linear cylindrical wire material perpendicular to its axial direction to form a handle material 1 having free end surfaces 1a' at both ends, the handle material 1 is bent into a substantially trapezoidal shape to form the handle material 1. Both free end surfaces 1a' are opposed to each other,
The axes 1' of both free end sides 1a intersect at an extremely small angle a, and the free end surfaces 1a' are deformed so as to come into contact with each other only partially, and while pressing both free end sides 1a from both sides, Both free end surfaces 1 of the both free end sides 1a
The electrode 2 is brought into contact near a', and a current is caused to flow between the two electrodes 2 from the power source 3 through the free end sides 1a and the contact portions 1a'' of the free end surfaces 1a'. A method for manufacturing a can handle, which comprises melting and forming a welded portion 1a'' between both free end sides 1a to manufacture a can handle.