JP2570052B2 - Guide bar for manufacturing welded cans - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide bar provided immediately before a welding roll for producing a welding can used for canned cans such as coffee beverage cans and juice cans.

[0002]

2. Description of the Related Art A welding can is generally formed by externally welding a wrap portion 2 of a can body preform 1 made of a surface-treated steel plate such as a tin-plated steel plate or a tin-free steel rolled into a cylindrical shape via a wire electrode 3. It is manufactured by mash seam electric resistance welding (a kind of lap seam welding) using a pair of welding rolls 4 composed of a roll 4a and an internal welding roll 4b (FIGS. 1 and 2). The formation of the wrap portion 2 is usually
A substantially opposing edge portion of the can body preform 1 is connected to a guide bar 5 'having a Z-shaped cross section (Japanese Patent Publication No. 54-26213 No. 5).
This is performed by passing the upper guide groove 6 and the lower guide groove 7 (see FIGS. 3 and 4).

The guide grooves 6 and 7 of the guide bar 5 'are shown in FIGS.
As shown in the figure, the upper and lower surfaces 6b1, 6b2 and 7b1, near the upper basal surface 6a and the lower basal surface 7a have a bosh section.
7b2 extend substantially parallel to one another, usually horizontally. The can body preform 1 may be provided with a guide pressing piece (not shown; for example, as shown by symbols 32, 33, and 34 in FIG. 4 of Japanese Patent Publication No. 54-26213), or a guide roll device (for example, Japanese Patent Publication No. 1 is conveyed in the direction A while being pressed so that the end surfaces of the edge portions come into light contact with the base surfaces 6a and 7a of the guide grooves 6 and 7, respectively. After exiting the bar 5 ', a lap portion 2 having a predetermined lap width is formed at a welding point 9 (FIG. 1). Along the circumferential line passing through the welding point 9 (FIG. 1), the drum-shaped rolls 10a, 10b, 10c, 10d, 1
Roll device 1 for can diameter regulation consisting of 0e, 10f, 10g, etc.
0, the wrap portion 2 is mash seam electric resistance welded by the welding roll 4 via the wire electrode 3 while the can body preform 1 is pressed relatively strongly, and the welding portion 8a
Is formed, and the welding can body 8 is manufactured.

[0004] The conventional guide bar 5 'is usually made entirely of cemented carbide. However, as described above, since the can body preform 1 is relatively strongly pressed by the can diameter regulating roll device 10, the leading end 5'a of the guide bar 5 '(in this specification, the leading end is the guide bar 5' Guide groove 6, which means a portion within about 20 mm rearward from the tip surface {5'a1})
The base surfaces 6a, 7a of 7 are liable to be worn and develop dents with the lapse of use. When such a depression develops, the width of the lap portion fluctuates and the welding pressure per unit area fluctuates along the length direction, so that a splash or a portion having poor welding strength is likely to occur. Therefore, after the production of about 15 million cans, the work had to be stopped usually about every one month, and the guide bar 5 'had to be replaced. This replacement causes a problem that a relatively expensive guide bar is newly manufactured and the production cost is increased due to a decrease in productivity due to a stoppage of the operation.

[0005]

[0008] The present invention, recessed in the base surface of the tip rather difficulty developed, and an object thereof is to provide a guide bar life.

[0006]

A guide bar for manufacturing a welding can according to the present invention is provided immediately before a welding roll for manufacturing a lap seam welding can, and guides a lap portion while guiding an edge portion of a can body preform. A guide bar having a guide groove for forming and having a Z-shaped cross section, wherein the base bottom surface of the guide groove at the tip of the guide bar contains 70% by volume or more of diamond fine particles.
Characterized in that it consists of a non-sintered diamond.

The guide bar may have a form in which a sintered diamond body is attached to a longitudinal slit formed at the tip so that the base surface of the guide groove is made of sintered diamond. . The guide bar has an upper chip having the same shape as the notch formed on one side of the head end including the tip, a lower chip combination body is screwed to the guide bar main body by filling the notch, and the upper chip has The first sintered diamond body is joined so that the upper base surface of the tip portion is made of sintered diamond, and the second chip is joined to the lower chip so that the lower base surface of the tip portion is made of sintered diamond. It is more preferable that the sintered diamond body is in an aspect of being joined.

[0008]

[Action] sintered diamond, die hardness is not very high
Contains at least 70% by volume of almond fine particles. Therefore large
Since the part is made of diamond, the can body preform
Edges, especially end faces, are in contact with substantially only diamond
(No substantial contact with the bonding metal)
(A sintered body mainly composed of WC) has much better wear resistance. Also, since diamond is fine,
Because it is easy to make the base surface a mirror finish,
The end face of the can body preform is cut and
No clogging occurs. In the case of the invention according to claim 1
Since the base surface of the tip of the guide bar is made of the above-mentioned sintered diamond, the whole is made of cemented carbide.
Made a dent in the basal plane than conventional guide bar is rather the difficulty and development,
In addition, since there is no clogging, the life is long. Claim
In the case of the invention according to Item 2, one sintered die is provided in the vertical slit portion.
By mounting the earmond body, the upper and lower guide grooves
The bottom surface should be made of sintered diamond at the same time
Can be installed, and the work of attaching the sintered diamond body is easy.
is there. In the case of the invention according to claim 3 , since the upper chip and the lower chip combination are screwed to the guide bar main body, when the base surface made of sintered diamond is worn, the chip can be easily removed. can be replaced, because it can be used repeatedly to guide bar body, the production cost is reduced.

[0009]

FIG. 3 is a side view of the guide bar 5 as viewed from the side of the welding roll 4, and FIG. 4 is a longitudinal sectional view of the tip 5a.
3 is a composite sintered body formed and joined on the composite sintered body 3. The remaining body of the guide bar 5 is made of cemented carbide. The sintered diamond body 12 contains diamond fine particles having an average particle diameter of preferably 0.3 to 10 μm, preferably in a content of 70% by volume or more, and the diamond fine particles are bonded to each other by a binder (for example, Co). ing. The composite sintered body 11 is buried in a correspondingly shaped vertical slit formed substantially at the center of the tip 5a in the width direction, and is mechanically fixed to the tip 5a by a spring pin 14. The cemented carbide substrate 13 may be fixed to the guide bar 5 by brazing.

The thickness t of the sintered diamond body 12 is, for example, 1.5 mm, and as shown in the figure, the base surfaces 6a, 7a of the guide grooves 6, 7 and the upper and lower surfaces 6b1, 6b2, 7 near the guide grooves.
b1, 7b2 extend to the portion of the sintered diamond body 12. The length L of the composite sintered body 11 in the longitudinal direction of the guide bar 5 is, for example, 10 mm, and in the case of this embodiment, extends to the position of the vertical dotted line 15 in FIG. The length L is preferably about 8 to 20 mm. If the length L is less than about 8 mm, it is difficult to manufacture, and if the length L exceeds about 20 mm, no particular improvement in the effect can be expected, but rather the cost is increased. The base surfaces 6a and 7a are mirror-finished with No. 3000 to 5000 lapping abrasives.

Reference numeral 25 in FIG. 5 shows a guide bar according to another embodiment. A notch 28 is formed on one side of the head end portion 25b of the guide bar 25 (the length thereof is much longer than that of the tip end portion 25a) slightly beyond the center line in the width direction.
The other side is a projection 2 connected to the guide bar body made of cemented carbide.
5b1. Upper chip 29 and lower chip 30 of upper chip / lower chip combination 31 having the same shape as cutout 28
However, the protrusions 25 are formed by filling the cutouts 28 and using screws 35.
It is fixed to b1.

A small sintered portion 34a composed of a sintered diamond body 32a having an L-shaped cross section and a cemented carbide substrate 33a is brazed by filling the small notch formed at the tip end of the upper chip 29 and firing. The outer surface of the hanging portion 32a1 of the united diamond body 32a forms the base bottom surface 6a of the upper guide groove 6. Filling the small notch formed at the tip of the lower chip 30, the sintered diamond body 32 b having a U-shaped cross section and the cemented carbide substrate 33
b is brazed, and the bottom surface of the U-shaped portion of the sintered diamond body 32b forms the base surface 7a of the lower guide groove 7. As will be described later, the life of a guide bar whose base surface is made of sintered diamond is about 90 million cans. When the life is over, remove the screw 35 and insert
0 may be removed, and new chips 29, 30 may be screwed onto the protruding portions 25b1 of the original guide bar 25. The sintered diamond body 32a joined to the upper chip 29 has a U-shaped cross section, and the sintered diamond body 3 joined to the lower chip 30.
2b may have an L-shaped cross section.

Next, a specific example will be described. 0.20mm thick
Body preform 1 consisting of a tin-plated steel sheet blank
As shown in FIGS. 3 and 4, the wrap portion 2 is
The base portions 6a and 7a of the guide grooves 6 and 7 and the vicinity thereof are formed using a guide bar 5 (mainly a WC-Co cemented carbide) made of a sintered diamond body 12 described below, and a lap portion 2 is formed.
Was produced by mash seam welding under the following conditions to produce a welded can body 8 having a welded portion 8a, and a defective welded portion (splash) requiring replacement of the guide bar 5 was generated for the first time at about 90 million cans. Sintered diamond body; average diameter of diamond: 5μ
m, diamond content: 85% by volume, binder: Co, thickness t: 1.5 mm, length L: 10 mm. Welding conditions; standard lap width: 0.35 mm, welding speed: 70 m /
Min, welding current frequency: 540 Hz, welding current: 4200 A, welding pressure: 50 kgf.

[0014]

Guide bars of the present invention exhibits, portions recessed to the base plane rather difficulty developed than conventional guide bars, and clogging is to put
Therefore, there is an effect that the life is long . Therefore, the number of cans to be replaced before the guide bar is replaced, and thus the number of usable days is increased, so that there is an advantage that the production cost is reduced. The invention according to claim 2 is characterized in that the upper and lower guide grooves are
The base surface should be made of sintered diamond at the same time.
It is said that the installation work of the sintered diamond body is easy
Has the effect of The invention according to claim 3 is a guide bar body.
Since the repeated use, an effect that the production cost is reduced more.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of an example of a welding apparatus using a guide bar according to a first embodiment of the present invention and a conventional guide bar having the same shape as that of the first embodiment.

FIG. 2 is a longitudinal sectional view taken along line II-II of FIG.

FIG. 3 is a side view of the guide bar of FIG. 1 as viewed from a welding roll side.

FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a perspective view of a main part of a guide bar according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Can preform 2 Lapping part 4 Welding roll 5 Guide bar 5a Tip 6 Upper guide groove 6a Base surface 7 Lower guide groove 7a Base surface 12 Sintered diamond body 25 Guide bar 25a Tip 25b Head end (guide bar main body) ) 26 Upper guide groove 26a Base bottom surface 27 Lower guide groove 27a Base bottom surface 28 Notch 29 Upper chip 30 Lower chip 31 Upper chip / lower chip combination 32a First sintered diamond body 32b Second sintered diamond body 35 Screw

Claims (3)

(57) [Claims] 1. A cross section Z provided immediately before a welding roll for producing a lap seam welding can and having a guide groove for forming a lap portion while guiding an edge of a can body preform.
In the V-shaped guide bar, the base surface of the guide groove at the tip of the guide bar contains 70% by volume or more of diamond fine particles.
A guide bar for manufacturing a welded can, comprising a sintered diamond containing the same . 2. A welded can according to claim 1, wherein a sintered diamond body is attached to the longitudinal slit formed at the tip of the guide bar so that the base surface of the guide groove is made of sintered diamond. Guide bar for manufacturing. 3. A combination of an upper chip and a lower chip having the same shape as a notch formed on one side of a head end including a tip of the guide bar is screwed to the guide bar main body so as to fill the notch. A first sintered diamond body is joined to the upper chip so that the base surface of the upper guide groove of the tip portion is made of sintered diamond, and the base surface of the lower guide groove of the tip portion is sintered to the lower chip. 2. The guide bar for manufacturing a welded can according to claim 1, wherein the second sintered diamond body is joined so as to be formed of a bonded diamond.