JPS5954477A - Manufacture of can barrel - Google Patents

Abstract

PURPOSE:To prevent the concentration of a welding current in a separating current, and to reduce cracks generated on a weld zone of a can, by opposing the separating parts of a linear electrode fed out along an outside roll, and a side face weld zone of a linear electrode fed out along an inside roll, when manufacturing a can barrel having a weld zone on its side face. CONSTITUTION:A guide roll 17 of an insde linear electrode 4 is supported pivotally by a mandrel 9 in the downstream of an inside roll 2. Subsequently, the inside linear electrode 4 is constituted so as to be fed from between a flat part 2a of the upper end of the inside roll 2 and a side face weld zone 7, at a slight angle theta to the side face weld zone 7. Also, a separating part 18 of the inside linear electrode 4 and a lower face 7b of the side face weld zone 7 are positioned nearly right under a separating part 10 of an outside linear electrode 3 and an upper face 7a of the side face weld zone 7, namely, so that the separating parts 10, 18 are almost opposed to each other, so that a welding current 13 is not concentrated on the separating parts 10, 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a can body, and more particularly to a method for manufacturing a can body, and more particularly, an electric μ (anti-No. 7, f-Lj
This invention relates to a method of manufacturing a fuselage.

Conventional electrical loss IJ'l', 'y-) Side surface (1SI difference j'; l-(A) by welding fLi fuselage (from tin-plated steel plate, 'j1-norikjiru, etc.) manufacturing method The method that is generally adopted is shown in Figure 1.
Between the outer line electrode 3 and the inner line '1Llfj
4 (a electrode 3 j..., and 4 to 1-1 people 1)
On the side, the external 1-'-rule ■ and the internal '1-ru' are wrapped around the 4-1 side.
; 1 per IS minute. -c1 can body molded body 5 is stacked iXj! This is a method in which the overlapping part 0 is welded by electric resistance in the direction of the 6-arrow Aji)j, and the f1j fuselage 86-- having the side welded part 7 is manufactured.

In the case of Kono, the internal r+-le 21J, -1/Toshiru p(, vs. 1-. is pivoted. And the internal
Since the can body formed body 5 is guided by the can body 1111, the diameter of the inner roll 2 is 1+fi.
, f'fl a>11. 'If the inner diameter of the fuselage 8' is also small. /ξ relatively small beer can], 5.
--- Can body 8 for cans (e.g. diameter of about 50-65 mm)
The diameter of the internal roll bow 2 when manufacturing is relatively small. The diameter of the outer roll 1 is as follows:
The diameter is relatively large and heavy from the viewpoint of weldability.

In other words, when manufacturing a can body for storing food and beverages by welding, the side welds 7 may have cavities or cracks. In order to prevent the occurrence of molten metal (molten metal protruding or splashing), solid phase welding, that is, forge welding, is usually used. In that case, the diameter of the inner roll 2 and the diameter of the inner roll 2 are
If l is relatively small with the same culm degree, the contact length between the roll and the overlapping cap 6 will be short, so the ratio of heating width of one ship corresponding to the vicinity of the zero value of the welding current of AC waveform (mainly stop string wave) M
Percentage occupied by the low target area (along the longitudinal direction of the welded part 7)
Therefore, welding parts or weak welding parts with low welding strength are likely to occur υ. To prevent this, the welding speed must be reduced and productivity must be sacrificed. This is because it will no longer be possible.

For this reason, a bare roll consisting of an outer roll 1 with a relatively large diameter and an inner roll 2 with a relatively small diameter is conventionally used, but in this case, a crack extending in the circumferential direction occurs on the inner surface of the side weld 7. /1. IJ7 solves the problem of being easy to use. This fissure opens into a stomata.

Normally, the side surface (the free part 1 of the welded part 7 is covered with a protective coating, but the part 5 of this crack I) is processed,
When subjected to processing such as neck-in processing, bead processing, or overhang processing (when forming barrel-shaped E5 etc.), crack 1
Cracks are undesirable because they open up and crack the protective coating, thereby impairing the corrosion resistance of the contents.

The reason for the occurrence of this fissure is 41(-) as follows.

As shown in Figure 2, welding 1), 5 and external
;1. □ and the push 1 applied to the inner roll 2 [- due to the elastic deformation based on the welding load, the outer roll 1 and the inner FSI! 1 Lff~ produces flat portions 1a and 2a in 2, respectively. At the same time, flat parts 1a and 2a
The outer line electrode 3 and the inner 111 line ' [lQ
Pole 1 parts 3a and 4a are also slightly reduced in thickness, mainly due to the elasticity 11-width. Since the outer roll 1 has a larger diameter than the inner roll 2 (- wire electrode;
and 4 are usually equal in thickness), the separation part 10 between the outer wire' electrode: 3 and the -1-1 plane 7a of the side welding part 7,
Separation part 311 between the 1-wire electrode 4 and the lower surface 7b of the side welding part 70
It is located on the F' flow side, that is, on the right side of the figure.

Therefore, the welding current passes through the vicinity of the front part 10 of the outer wire electrode for 30 minutes;
However, the bath contact portion of the separating section 11 is particularly likely to be heated to a high temperature. Therefore, as the heat-affected zone 14 approaches the peak of the bath contact current waveform, the heat-affected zone 41 (part 1 where a change in structure is observed in the mirror) becomes heavily downward (shank 4), causing the inner surface of the can to deteriorate. ■Toward,
1-1a approaches the lower surface 7b of the side weld 7, and the pole ψ;1. ; If so, go to ☆; 11.1
a reaches (・then7 b (LI:), and locally breaks the city (LI5), and the fissure 1'=l l G corresponding to the opening iij, l!I of pore 15 is generated. Seem.

The present invention is described below.
'r? I! The goal is to aim for j.

- In order to achieve the first objective, the present invention is relatively thick/,
5 external barrel and a relatively small internal diameter "J-ru's 1111"
, respectively, the line electrode of light 1 and the polarity of the second line 'l' are /i'L
-' Advance the overlapping part of the CM can j114 molded body,
Approximately: Connect il5 to electric resistor 1. /-mu weld,
In the method for manufacturing a can body having a side melt of 8μ, downstream of the can body, a second
The wire electrode is welded on the side Rts & girl jL ('I'i
The second line ′?
Provide a guide roll for the U
Tsu-r,) person! :r 1. ,, 4〕-mountain ((1~1-J
2. Separation part of the second wire electrode from the side welding part - (1tll with lIK sign that it is oriented in the 10-1 direction)
A method for manufacturing a can body having jT11# if j□τ1~ is provided.

Koshi, F. The present invention will be explained.

Figure 3 shows 1. - Same as Figure 1 - Ladle number: l-15
) K, l, li'i1-like parts are small. Internal roll 2
I: Flow Vq (tll 1 foot 4 guide 1)
, -le 17 is C11ilt+
It is supported and the inner line upper pole 4 is 111111rri melt J
'K NVs 7 'l+-i) and l: set the condition i
l:lSlight corner 1 boat θ(ffi, + +*l reference!
i',), and the upper end of the inner 1'J-rule 2 (f3 tangent,
The guide D-rule 17 is arranged such that the feed j-14 is Ir-i from between the NF'-J11 portion 2a of I, 0 and the side welding portion 70.

The angle θ is, as shown in Figure 4, yi, l1tll sound!
′[lj (□田?, Separation part between 3 and the upper surface 7a of the side welding part 7l O(tsuD:t &'& directly below, inner 1111
Separation part 18 between the wire electrode t and the lower surface 7 b of the side foil layer part 7
, i.e., the separating section 10 and the minute tit r
ζ1(t8, is determined so that they are almost opposite to each other. Unknown r
f41], "almost facing" means welding point X2 (
The intersection of the li line connecting the center 0 of the outer roll 1 and the center 0' of the inner roll 2 and the lower surface 7b of the side weld) and the minute t'! II
: +xl (distance 1 between 18, foil contact x, + (intersection of the straight line connecting center 0 and center 0' and side surface contact part I-, 7a) and minute X [distance between 1 part 10 The effective contact ratio t/s, which is the ratio of S, is 080 to 1.2 (1, 2 or 09 (→ to 1..10).

In FIG. 4, the portion of the inner wire electrode 4 that is located slightly downstream of the separating portion 19 between the inner wire electrode 4 and the inner wire electrode 2 is the portion of the inner wire electrode 4 that corresponds to the flat portion 2a. This is because the portion 4a is thinner than the portion 4b between the inner roll 2 and the guide 17 mainly due to elastic compression.

Since the separating part 18 is located almost directly below the separating part 1 (, 1) as shown in [below]-, the welding current 1;・
1 also inside the side reservoir contact part 7 19 - force direction is 11 center t=i=
(\'l) It becomes difficult to distinguish between the above-mentioned Unaina fissure 10 and stomata I5.

The above-mentioned article f'l (1 (4) angle θ is, for example, the straight line between the external roll 1 and the internal roll 2 (each roll consists of a planer). (l mm upper/15) piece, outer and inner 111111 gland'ru (
愼3 + 4 to 19 l, (111Lf1 of l mm
111 wire (pressure F ratio 67); bending, welding load 50
kg, [~5 degrees, more preferably C; L 2.
-: 3 degrees. If the angle θ is greater than 5 degrees, the minute + 1i
lt *B 18 is located far upstream from the separating section 10, approaching the state shown in Fig. 2 at 2 + + 111 melt] d It is difficult for the device 1 to occur on the inner surface of the section 7, while the angle θ is When the size is smaller than 1 melon, the separation part 10 is located far upstream of the separation part 18, and the contact current at the separation part 10KM concentrates, causing a crack to occur on the outer surface of the side weld part 7. This is because it becomes

Note that the relative (q positional relationship, i.e., the i-j effective contact ratio t/s, of the separating portion 1 (1, 18) is jp,
A 0.5 mm thick steel plate is used, and a pressure-sensitive paper (for example) is placed between the I4*L plate, the I side wire electrode 4, the inner wire electrode 4, and the inner wire electrode 4.

Lescale (product name), for medium pressure, Fuji Photo Noil A (
Co., Ltd.) to apply a force equal to the welding load to the external roll 1.
This can be determined by detecting the color change area of the pressure sensitive paper when it is applied between the pressure sensitive paper and the inner roll 2.

The temperature of the wire electrode increases as it passes through the melt. An increase in temperature of +111 is undesirable because it overheats various parts (not shown) of the welding equipment that the wire electrode comes into contact with, causing welding tangles. In the conventional case, the external line electrode 1 and the internal line electrode 2 are water-cooled from the old capital 22, and the external line electrode 3 and the internal line electrode/1 are cooled by water cooling, respectively.
Miyako ``7.
At 11+, turn up] and increase contact.
This was intended to prevent the temperature of the wire electrode from rising. Study 1: In the case of the diagram below, the inner line 'il + on the sending side: (@4 and l) I 81J Rono L2 is essentially a point contact.
c、trill Ittll remark! ′? Inside of E pole 1 “1
1. Cooling by Rule 2 cannot be expected. /'-0''In addition, the internal water cooling of the guide tv-nov 17 is not possible when the inner diameter of the 4 mandrel 9 is small (for example, about 50 m).
, because there was no space for water cooling piping,
It's good. In order to solve this problem, FIG.
From 17 to 7, connect the 11 wire electrode 40 part to the internal [Call 2%, & (=t iJ-, contact f1
1:l J1 is greatly increased to cool the 1111+ line electrode 4 (T+ -> 1t-1, all 11 are shown.

According to the invention, the outer line electrode and
(6 tangent 1<1~) 2 (7) Separation part, and inner line electrode and side surface ta contact R1! ,'y) The neck [1j rope 1Ll)σ) is in contact with M with the parts almost facing each other, and m at the separating part.
Because of the contact current M-middle or 1I) j city J ft-...- due to the 40 cm crack on the inner and outer surfaces of the side weld zone, it is possible to have the effect of being able to gravitate to θ. C Vero.

Next, an example will be explained.

Example external [1-) [river (made of copper alloy) C) Inner diameter 11.
(-) w, internal 1: ] -ru 2 (jl" made of I alloy) σ) IILL (¥', '19 mm.

Outer and inner wire electrodes: 3 pieces (use rate 67%)! 1
Welding machine (Welding I'5. Flowing 25
0 H7, UD , -+lE 'j1. ill )
'c I'tl 'x, tin plated off) (anti(r1/s0
2.l mrt+ ) in the middle of the can body formed body 5 = j part 0 (width 0.ri vlrn ) - <, welding load 50! iz: Meshing speed 1 (1m/matsu/-
・／〜mu weld, weld f, lr 111:・11 t8
Intermediate production 1-k. (Changing the angle θ during J/4- of the stand,
4... cracks on the side surface 1 and the connecting part 7 (average thickness 0.35 mm) are 11 yuan! -4,i, welding ill flow value, of which 1
) 1 wire electrical repair, 1 temperature, and 1) side bath 1 side part 7 of m welding can body 8 (1'1A I-!).

Conclusion ±)↓ in Table 1・j,zu.

The larger the angle θ, the more weldable γ
iL City', ? The reason why the & value J becomes sharper is thought to be because the contact 1 (between the inner wire electrode and the side weld 111) becomes longer than L.

As the normal current value of the bath 1 increases to y1, the l'ill of the welded part of the 1lIII wire electrode hot wire type 1il1 surface welding part (1 also -L,
It's rising.

[Brief explanation of the drawing]

Figure 1 shows an example of the method for manufacturing a welded can body (see 1).
Figure 2 is a cross-sectional view of the phloem ft1' to show the manufacturing method shown in Figure 1, and Figure 3 is a manufacturing method of the welded can body of the present invention. Fig. 1 is a vertical cross-sectional view of the principal part of the sump showing the manufacturing method shown in Fig. 3, and Fig. 5 is an explanatory front view of the sump showing the first example. (
FIG. 7 is an explanatory front view of a container showing a second example of the method. 1...External roll, 2...Internal roll, :3...
Outside line electrode (first line type (ke), 4...inner line electrode (
2nd wire electrode), 5... Can body molded body, 6... Overlapping part, 7... Side bath contact part, 8... Can body, 10...
・Separation department, 17...1 call for guidance, 18...minutes^1
f part. 2 Figure 2 Figure 4

Claims (1)

[Claims] (1) Opening the relatively large diameter outer roll and the relatively small diameter inner roll, the first wire electrode and the second wire are stacked to form the body through the stomach f-1'z. In a method for manufacturing a can body having side welds, a 20th line is formed downstream of the inside (li) by welding the overlapped portion by advancing the overlapped portion and welding the overlapped portion by electrical resistance 7-, z. A guide roll for the second wire electrode is provided so that the electric current is sent out at a slight slope with respect to the side surface m-contact part, and the first wire electrode is sent out with a slight slope to the external opening. Manufacturing a can body with a side weld, characterized in that the separation part between the side weld and the second wire electrode and the side weld are oriented approximately 71 directions. Method.