JPH01215471A - Manufacture of welded can barrel - Google Patents

Abstract

PURPOSE:To prevent imperfect airtightness of a welded can barrel by making the peripheral speed of a couple of barrel diameter regulating rolls at least situated at the symmetrical positions mutually with respect to a plane passing the axial center of a can barrel preform and a welding point among a group of barrel diameter regulating rolls equal to the speed of linear electrodes passing an outside electrode roll. CONSTITUTION:The can barrel preform 7 forms an overlap part 7a while proceeding and subsequently, its front comes into contact with the group 5 of regulating rolls and at the same time, the overlap part 7a bite between the linear electrodes 3 and 4 and is subjected to electric resistance mash-seam welding at the welding point 6 and made to the welded can barrel. The welded can barrel then proceeds at the welding point 6 by the outside electrode roll 1 via the linear electrode 3 and at the same time, proceeds at the same speed practically as the linear electrodes by the regulating rolls 5b1 and 5b2 and a rubber belt on which the welded can barrel is absorbed magnetically by a magnet. Accordingly, even if the friction coefficient between the linear electrode 3 and the overlap part 7a is reduced, since driving by the regulating rolls 5b1 and 5b2 and the rubber belt is not influenced thereby, the imperfect airtightness based on a delay of proceeding of the welded can barrel hardly takes place.

Description

DETAILED DESCRIPTION OF THE INVENTION A welded can body for use in, etc. is manufactured by electrical resistance welding of the overlapping portion of 7 ohm can body grilles via a wire electrode.

(Prior art) Welded can bodies used for beer cans, etc. are usually
K as described in Publication No. 26213.

Along the outer circumferential surface passing through the welding point, the can body glyph form is held by a group of freely rotating body diameter regulating rolls, and the overlapping part of the can body preform is separated from the outer electrode roll, which is a drive roll, and the free rotation. It is manufactured by electrical resistance machining and seam welding via wire electrodes between inner electrode rolls which are rotating rolls.

The feeding of the 7 ohm can body grill is carried out by pushing the rear end surface of the preform with a finger attached to an endlessly circulating chain until the front end of the overlapped part of the can body reaches the welding point. However, after the front end is inserted between the wire electrodes, the outer electrode roll passes through the wire electrodes.

The reason why the can body preform is not undersized by the fingers after the biting is that if the can body preform is forcibly fed by the 74-inch W-, the fingers will cause defects such as dents in the part that should become the flange part of the can body preform. This is because it becomes more likely to occur. In other words, the finger speed and the circumferential speed of the outer electrode roll do not match.

If the former is faster, various defects due to the aforementioned dents, drops, and drops are more likely to occur. The above-mentioned dents cause fatal defects such as flange cracking and flange peeling during the flange forming process, and are likely to cause leakage of the contents of the canned product.

(Problems to be Solved by the Invention) The above-mentioned method of feeding via wire electrodes can be carried out smoothly when ordinary bare wire electrodes are used, but the inventor of the present invention As proposed in Publication No. 61-135486, when using a wire electrode coated with a low-melting metal such as tin or a tin alloy to prevent defects such as pitting, the following problems are likely to occur. found.

This is thought to be because during welding, the low-melting metal covering the overlapping part, and therefore the part of the wire electrode that comes into contact with the welding part, melts due to welding heat, reducing the 111 friction coefficient between the wire electrode and the overlapping part. However, there is a scratch between the wire electrode and the overlapping part, and hence the welding part.
As a result, the progress of the can body glyph form during welding is delayed, and subsequent can body preforms collide, resulting in so-called jams. Even when jams do not occur, slipping at the overlapped part Since the welding time of the part is long, the heat generation in this part is large, and it is easy to melt and cause perforation, which impairs the airtightness of the welded can body.

The present invention solves the problem due to slip occurring between the overlapping portion of the wire electrode coated with a low-melting metal and the can body preform.
To provide a method for manufacturing a welded can body, in which a can body preform during welding is fed via a crimp electrode to an outer electrode roll, in which a delay in the progress of the can body preform is hardly caused. With the goal.

(Means for Solving the Problems) The method for manufacturing a welded can body of the present invention includes holding a can body glyph form along the outer circumferential surface passing through a welding point by a group of body diameter regulating rolls, and stacking the can body preforms. A method for producing a welded can body by electrical resistance welding between an outer electrode roll and an inner electrode roll via a wire electrode coated with a low-melting metal; At least one pair of body diameter regulating rolls, which are positioned symmetrically with respect to a plane passing through the axis of the can body preform and the welding point, are connected to the wire electrode whose peripheral speed passes through the outer electrode roll. The driving speed is substantially equal to the speed of the vehicle.

(Function) At least one pair of body diameter regulating rolls of the group of body diameter regulating rolls overflowing to the outer circumferential surface passing through the welding point and holding the can body preform is connected to a wire electrode whose circumferential speed passes through the outer electrode roll. Since the wire electrode passes through the pair of body diameter regulating rolls and the outer electrode roll, one can body glyphome is moved at a speed substantially equal to the speed of the can body. Even if the low melting metal is melted by the welding heat and the friction coefficient between the overlapping part and the wire electrode decreases, the progress of the can body preform by the body diameter regulating rolls will not continue. Since the process can be continued, delays in the progress of the can body preform are unlikely to occur.

Since the body diameter regulating rolls are positioned symmetrically to each other with respect to a plane passing through the axis of the can body silica ohm and the welding point 9, the can body silica ome moves in the direction of the axis.

There is no possibility that the movement will be lopsided with respect to the plane.

(Example) In FIGS. 1 and 2, l represents an outer electrode roll.

2 is an inner electrode roll, 3 is a wire electrode passing through the outer electrode roll l, and 4 is a wire electrode passing through the inner electrode roll. wire electrode 3
, 4 is usually made of one continuous copper wire, and in the case of this example, it is coated with tin (the coating thickness is, for example, 0.5 to
1/d).

Reference numeral 5 denotes a body diameter regulating roll group, which presses and holds the outer peripheral surface perpendicular to the axis of one can body preform 7 that passes through the welding point 6 and holds it while guiding the can body preform 7. Regulate to a specified outer diameter.

The body diameter regulating roll group 5 includes an upper regulating roll 51 located at a position facing the outer electrode roll 1, and rolls symmetrical to each other with respect to a vertical plane passing through the axis of the can body preform and the welding point 6.
Each one is sequentially arranged below the upper regulation roll 5a.
Pair of regulation rolls 5b1゜5bl ;5eI Isc!
:5dl, sa, :5el.

5el and 5f, , 5f are good.

The regulation rolls 5a and 5b are the regulation rolls 5, respectively.
Each roll 5m, 5bl,
sb presses and regulates the preform 7 in the radial direction by the sliding rings 9 and 1°, while the regulating roll 5e1
．． 5cl g5dl.

5s1, sea, sf, and 5f are holding bodies 8c having the same structure as the holding body 8d of the regulation roll 5d.
, , 8c, , 8d, , 8el , 8e , 8fl and 8f , each roll 5c1°5C!
t5'1 *5dt Examination 5@1 Meeting 5@t
t5f+*5f is configured to press and restrict the preform 7 in the radial direction by the spring 11.

In addition, each holding body 8" z 8 bs t 8 bs
g 8 el.

8ct, 8dt, sa, s8"l, 8
alt8fIt8f is fixed to regulation gray) 12. Each regulation roll of the regulation roll group 5, regulation roll 5b.

and 5b, rotate freely except for.

Recesses 15 and 16 are formed in the center of each side of the regulating rolls 5b and 5b, into which driving rubber pels 13 and 14 are inserted. rubber belt 13
and 14, respectively, as shown in FIG. 1, 9M3,
The driving pulleys 18 and 19, and the lower /4' spaces 13m and 14m (see FIG. 4 for 14a) are in contact with the can body preform 7 and therefore the welded can body 19 in the direction of movement. The regulation rolls 5b and 5b are driven by circulating in the direction of arrow A. Drive pulley 18
and 19 are respectively pivotally supported by support plates 20 and 21 fixed to the regulation grate 12, as shown in FIG.

The drive pulleys 18 and 19 control the speed of the rubber belts 13 and 14, and therefore the weight of the regulating roll 5b, via a drive mechanism (not shown) 22 that is linked to the drive device of the outer electrode roll 1.

The circumferential speed of 5b is substantially the circumferential speed of the outer electrode roll 1, that is, the speed of the wire electrode 3 passing through the outer electrode roll 1 (when the wire electrode 3 does not slip with respect to the outer electrode roll 1).
is driven at a rotational speed equal to

As shown in FIGS. 1 and 5, the belts 13 and 1
Between the upper and lower bases of 4, the lower surface 24m is below/4's 13
The magnet 24 is arranged so as to come into contact with most of m and 14m. The magnet 24 is attached to the welded can body 19 with a rubber ring) 13 and 14's lower nozzle 131L.
and 14 m to prevent slipping and slipping during the transition between the rubber pels 13, 14 and the welded can body 19.

In the above apparatus, the can body cylinder 7 made of a surface-treated steel plate such as tin-free steel is pushed by a finger (not shown) on its rear end face and moved in the direction of arrow A, while being pushed into a predetermined position by two parts (not shown). After forming the overlapping portion 7a with the overlapping width of Tree 1-A7
move away from Thereafter, the overlapping portion 7a is electrically resistance seam welded at the welding point 6 to form a welded portion 19m. Therefore, the portion of the preform 7 downstream of the welding point 6 becomes the welded can body 19.

The preform 7 and therefore the welded can body 19 have the welding point 6
, the wire electrode 3 is advanced in the direction of arrow A by the outer electrode roll 1, and at the same time, the regulating roll 5b1.
The welding can body 19 is magnetically attracted by the rubber drums 13 and 14 by magnets 5b and 24, and is moved in the direction of arrow A at substantially the same speed as the wire electrode 3.

Therefore, even if the tin covering the wire electrode 3 melts at the welding point 6 and the coefficient of friction between the wire electrode 3 and the overlapped portion 7a or the welded portion 19a decreases, the regulation rolls 5b, 5b and the rubber belt 13. Since the drive by 14 is not affected, there is no fear that the advance of the preform 7, that is, the welded can body 19, in the direction of arrow A will be delayed.

(Effects of the Invention) In the method of manufacturing a welded can body of the type in which the can body preform during welding, that is, the welded can body is fed via a wire electrode by an outer electrode roll, the wire electrode is made of a low-melting metal. However, it has the effect that poor airtightness due to jamming or perforation of the welded part is unlikely to occur due to the delay K in the advance of the can body preform and therefore the welded can body.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view of an example of an apparatus used for carrying out the present invention, FIG. 2 is a vertical cross-sectional view taken along the line ■-■ in FIG.
The figure is a plan view of the main part of the device in Figure 1, and Figure 4 is the mV of Figure 3.
FIG. 5 is a side view of the main part viewed from the -mV line, and FIG. 5 is a detailed front view of the rubber belt arrangement portion of FIG. 1. 1...Outer electrode roll, 2...Inner electrode roll, 3
゜4... wire electrode, 5... trunk diameter regulating roll group, 5b,
. 5b... A pair of body diameter regulating rolls, 6... Welding point,
7...Can body cylinder, 7m...Overlapping part, 1
3゜14...Rubber belt, 19...Welded can body. Figure 4

Claims (1)

[Claims] (1) The can body preform is held by a group of body diameter regulating rolls along the outer circumferential surface passing through the welding point, and the overlapping part of the can body preform is held between the outer electrode roll and the inner electrode roll, with a low melting point. In a method of manufacturing a welded can body by electrical resistance welding via a wire electrode coated with metal, the axis of the can body preform and the welding point of at least one pair of the body diameter regulating roll group. Welding characterized by driving body diameter regulating rolls that are positioned symmetrically to each other with respect to a plane that passes through such that the circumferential speed thereof is substantially equal to the speed of the wire electrode passing through the outer electrode roll. Method of manufacturing can bodies.