JPS6033673B2 - Method and device for manufacturing metal plates for metal can bodies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a metal plate for a metal can body, and more particularly, to a method and apparatus for manufacturing a metal plate for a metal can body, and more specifically, a method and apparatus for forming a flange portion of a metal can body;
The present invention relates to a method and apparatus for manufacturing a metal plate for a metal can body with an inner-coated flange portion, in which hair-like paint film fragments (hereinafter referred to as enamel hairs) are not generated on the edge of the flange portion.

As seen in the production of beer cans, carbonated beverage cans, general food cans, etc., the inner surface of the can body of a large metal plate (such as tin-plated steel plate, stain-free steel plate, and aluminum alloy plate) is After applying a double coat of paint (e.g., undercoat: phenolepoxy paint, top coat: vinyl chloride paint), cut into blanks, and form metal cans with flanges into Tsukioka body 1 (see Figure 1) using the conventional method. ) may be manufactured.

In this case, as shown in FIG. 1, a large number of enamel hairs 3A ( Width: approx. 0.2-0.3 ribs, thickness: approx. 5-20
Buddha skin (approximately 5 to 3 pieces long) often occurs. Such enamel hairs tend to occur when the coating thickness is greater than about 5 mm even with a single coat. This enamel hair peels off from the cut end surface of the flange portion during the can manufacturing process and finally remains attached to the coating film on the inner surface of the can body. Even if you use a rotating brush or the like to try to remove it, it becomes more and more stuck due to the action of static electricity, making it difficult to remove. Therefore, it is often mixed into the contents of cans, which are products, and the product value is often significantly reduced. My goal is,
A cut metal plate with a relatively thick coating formed on the surface that is to become the inner surface of the can, which after being formed into the can body, does not cause enamel hair when forming the flange, and is suitable for metal can bodies with flanges. An object of the present invention is to provide a method and apparatus for manufacturing metal plates.

The causes of enamel hair are thought to be as follows.

As shown in FIGS. 2 and 3, there are burrs on the cut end surfaces 2'a and 2'b of the can body 1' on opposite sides of the can body 1' before the flange portion is formed. ``a,, 2'b,'' are generated, and the coating film 3 has burrs 2 on the cut end surface 2'a side.
'a, and the curved portion 2'a on the opposite surface, and on the other hand, on the cut end surface 2'b side, it adheres to the inner surface of the burr 2'0. However, when the flange is processed, as shown in FIG. 4, the part of the paint film attached to the inner surface of the burr 20 does not peel off, but the part of the paint film 3a attached to the curved part 2a2 peels off, and most of it is removed. Enamel hair 3A cut from its base
easy to form. This is because the bending part 2'a2 is formed by cutting, and tensile bending stress is applied to the coating film part 3a, so the adhesion of the coating film in this part decreases, but if only the cutting is done, the coating film It does not reach the level of Omotekoshijaku in part 3a. However, when flanging is performed, additional tensile stress is applied to the coating film portion 3a in the circumferential direction, and due to friction with the flanging tool, it finally peels off and is cut from the base of the peeled part, forming enamel hair. It is assumed that This peeling is more likely to occur as the coating film 3 is thicker and harder (ie, less ductile). On the other hand, since the coating film portion 3b is subjected to compressive bending stress during cutting, the adhesion strength of the coating film portion 3b is not significantly reduced, and the flange is prevented from coming into direct contact with the flange processing tool due to the burr 20. This is presumed to be the reason why peeling and cutting did not occur even after processing. Therefore, by removing the coating film portion 3a from the blank (or metal plate) before forming the can body, the generation of enamel hair can be prevented.

In order to achieve the above-mentioned object, the present invention provides a method for manufacturing a metal plate for a metal can body with a flange part, the inner surface of which is coated with a coating film, and the edge of which the coating film is formed and which is to become the flange part. The metal plate with the green cut off is transferred with the edge green parallel to the transport direction, the cutting edge of the edge green is transferred, and the corner covered with the coating film on the side where burrs are not formed is placed. The present invention provides a method for manufacturing a metal plate for a metal can body with a flange portion, characterized in that the coating film is removed from the corner by moving a tool.

Furthermore, the present invention provides an apparatus for manufacturing a metal plate for a metal can body with a flange portion on which a coating film is formed on the inner surface, and a metal plate on which the coating film is formed and the edge to become the flange portion is cut. comprises a first pinch roll, a second pinch roll, and a guide for transporting the edges parallel to the transport direction, and the roll center distance between the first pinch roll and the second pinch roll is a conveying means arranged to be smaller than the length of the edge green of the metal plate, and a cutting edge of the edge between the first pinch roll and the second pinch roll, which prevents the formation of burrs; The present invention provides an apparatus for manufacturing a metal plate for a metal can body with a flange portion, comprising a tool disposed so as to be able to come into contact with a corner coated with the coating film on the side.

The present invention will be described below with reference to drawings showing embodiments.

In FIG. 5, reference numeral 10 denotes a stacker in which a large number of metal plates 11 are stacked while being supported by protrusions 10a.

The metal plate 11 has a coating film 3 (see FIG. 6) formed on the surface that is to become the inner surface of the can, and is arranged so that the surface faces upward and the edge green 12 that is to become the flange of the can body. In addition, the cut edge of the edge (for example, cut by a slitter) is placed so that it is parallel to the transfer direction (direction of arrow A) and on the same vertical plane, and the generated burr 12a is placed on the lower surface. They are stacked so that the end edge 12a on the side to be transferred is on the front side in the figure, that is, on the right side with respect to the transfer direction (
(See Figure 6). A pair of magnet rolls 13 are arranged below the stacker 10, and two bright limit belts 14 that engage with both ends of the magnet rolls 13 are constantly moving in the direction of the arrow. Reference numeral 15 denotes a vacuum suction cup installed between two endless belts 14, which is raised at a certain timing by a drive mechanism (not shown) and adsorbed to the bottom surface of the metal plate 11 stacked at the lowest position. The process of lowering the metal plate 11 onto the endless belt 14 (at that moment, the vacuum is broken by a mechanism not shown) is repeated.

The metal plate 11 placed on the endless belt 14 is then passed over a guide (in this case, a guide plate) 16 and sent to a first pinch roll 17 .

The upper roll 17a of the first pinch roll is composed of a plurality of (four in FIG. 6) elastic rubber rolls, and the lower roll 17b
is made of metal (e.g. steel). Each roll is supported by a stand (fixed to the frame 18), not shown, via shafts 17a' and 17b'. 1
9 is a second pinch roll, which has the same structure and circumferential speed as the first pinch roll.

Same as rule 17. The first pinch roll 17 and the second
The center distance between the pinch rolls 19 of the metal plate 11 is
Each pinch roll is knotted so that the length is smaller than the length of the end green 12 which is to become the flange portion of the pinch roll. The metal sheet 11 is thus pushed out by the first pinch roll 17 and/or between the first pinch roll 17 and the second pinch roll 19. By being drawn out by the roll 19, the paper is transported on the guide 16 in the direction of arrow A. A filer 20 is provided between the first pinch roll 17 and the second pinch roll 19, and is used to remove the coating film 3 (see FIG. 6) on the upper corner 2a2 of the edge 12a of the metal plate 11. The tool 30 (see FIG. 7) is provided, the details of which will be described later.

A first vacuum dust collection nozzle 21a is provided downstream of the tool 30 and close to it, and removes removed paint film pieces and metal powder from the metal plate 11.

22 is the third pinch roll, which has the same structure and circumferential speed as the first pinch roll.
This is similar to the pinch roll, and the metal plate 11 from which the coating film has been removed is sent to the next process.

Above the guide 16 between the second pinch roll 19 and the second pinch roll 22 is a second vacuum concentrating nozzle 21b.
A rotating brush 23 that rotates in the direction of the arrow is provided adjacent to the downstream side of the first vacuum dust collecting nozzle 21a.
Any remaining paint film fragments or metal powder that were not removed by the steps are completely removed from the metal plate 11 by these steps. 7 and 8 show the filer 20, and the tool 30 has a cutting edge shape, for example, as shown in FIG. Yanagi and Sanyanagi),
Preferably, it is made of cemented carbide.

The tool 30 is fixed in a holder 31 via an IJ plate 32 with screws 33. 34 is a holder clamp, and the holder 31 is fixed in the holder clamp by screws 35.

When a particular cutting edge portion of the tool 30 is worn out, the tool 30 can be moved in the axial direction so that a fresh cutting edge portion can be brought into contact with the upper corner 12a2 of the edge green 12a of the metal plate 11, or its replacement can be carried out using the screw 33 or 35. This can be done by loosening the . The holder clamp 34 is fixed to a horizontal shaft 37 rotatably installed inside a vertical portion 36a of a bracket 36 having an L-shaped cross section. Therefore, the elevation angle of the tool 30, that is, the vertical angle 0 with respect to the metal plate 11 (see FIG. 7) can be adjusted by rotating the adjustment bracket 38 fixed to the end of the horizontal shaft 37 to a predetermined angle along the vertical plane. This can be done by fixing its position using the fixed shaft 39 and a pair of nuts 401. Bracket 36 is rotatably mounted on support plate 41 about a vertical bolt 42 threaded onto support plate 41. As shown in FIG. 10, a plurality of screw holes 43 are formed in the support plate 41 at equal intervals along an arc centered on the vertical bolt 42. As shown in FIG. On the other hand, two slots 44 are formed in the horizontal portion 36b of the placket 36 at positions corresponding to the screw holes 43. Therefore tool 30
Adjustment and fixation of the angle of the metal plate 11 with respect to the transport direction are as follows:
This can be done by rotating the bracket 36 into position about the vertical bolt 42 and tightening the periphery of the slot 44 with the bolt 45 screwed into the threaded hole 43. Holder clamp 3 of holder 31
A collar 46 is fixed to a position opposite to the tool 30 with respect to the collar 46 via a hydraulic bushing (not shown) (the shaft for moving the holder 31 in the vertical direction can be loosened). adjustment plate 47
is fixed.

On the other hand, a pair of horizontal arms 48 are fixedly attached to the vertical portion 36a of the bracket so as to sandwich an adjustment plate 47. Adjustment can be made by adjusting the position of a pair of adjustment bolts 49 into which each horizontal arm 48 is inserted. The angle of the plate 47 around the marking line of the holder 31, and therefore the cutting angle of the cutting edge 30a of the tool 30, can be adjusted. The support body 5 having an L-shaped cross section is fixed to the frame 18, and the first
As shown in FIG. 1, two guide pins 51 are screwed onto the horizontal portion 50a of the support 50. As shown in FIG.

Reference numeral 52 denotes a sliding body, which is formed with two guide holes 53 corresponding to the guide pins 51, and is configured to be movable up and down along the support 50' by rotation of a screw 54.

The vertical position of the sliding body 50 is fixed by bolts 55. The screw 54 can be rotated by turning the handle 56, and the worm shaft 57 and worm wheel 58 (
The screw 54 is connected to the shaft of the worm wheel). Therefore, the height of the tool 30 can be finely adjusted by rotating the handle 56. When it is desired to raise the tool rapidly, such as in the case of repair, it is sufficient to remove the bolt 59, remove the worm shaft 57, and turn the handle 60. Note that the support plate 41 is fixed to the sliding body 52 by bolts 62 that fit into the upper part of the hole 61 of the alcoholic body 52. As shown in FIGS. 7 and 12, the burr 12a on the lower end 12a of the metal plate 11 is removed by the tool 30, and the burr 12a is removed by the roller 66 provided below the tool 30. was placed at war.

The shaft 66a of the roller 66 is rotatably attached to the upper part of a sliding plate 69 which is elastically movable up and down within a fixed guide groove 68 by a spring 67. Therefore spring 6
By adjusting the strength of 7 and the height of the tool 30, the upper corner 2 of the edge 12a of the tool 301 of the above-mentioned cutting edge is removed.
By adjusting the pressing force on a2 and substantially removing only the coating film 3, it is possible to reduce the amount of metal removed as much as possible. In FIGS. 7 and 8, the direction of the shadow line of the tool 30 is perpendicular to the edge line 12a, but in actual work, the direction of the axis line is perpendicular to the edge line 12a, as shown in FIG. It is preferable to hold the tool 301 obliquely in the direction of the transfer direction A in order to reduce the impact applied to the tool 301 at the point where the front edge 11a of the metal plate 11 and the tool 30 come into contact.

The preferred range for angle Q is about 5 to 80 degrees. If it is larger than about 80 degrees, the above-mentioned impact will not be sufficiently cushioned and the tool will be easily damaged.If it is smaller than about 5 degrees, the removal ability will decrease, and the tool stand will not be able to be moved, making adjustment difficult. This is because it becomes difficult and further causes problems such as the cutting width becoming unstable. As described above, from the corner 12a2 of the edge green 12a on the side where no burrs are formed, the width is preferably about 0.3
The metal plate 11 from which the coating thickness 3 has been removed over ~0.5 ribs is left as is or is divided into several equal parts in the direction perpendicular to the end green 12a to form a blank, and then the end edge 12a and the opposite end edge 12a are made into blanks. The green end 12b is rounded to form an open end, and the side seam 24 is joined by known means such as soldering, welding, or gluing to form a can body. By means of the flange part 2
6a and 26b are formed to form a can body 25 with flanges (FIG. 14).

As shown in FIG.
Since the coating film 3 is removed from the curved portion 12'a2 corresponding to a2, there is no generation of enamel hair 3A. In addition, in FIG. 15, 12'a and 12'b are respectively the edge 1
The edge of the flange portion corresponding to 2a and 12b, 12'
a and 12'b are burrs. According to the above embodiment, the metal plate 11 is placed in the stacker 10 at its edge 12a.
are aligned on the same vertical plane, vacuum suction cup 1
5 onto the endless belt 14, and then by the magnet roll 13, it slides on the guide 16 and is sent to the first pinch roll 17, so that it is between the first pinch roll 17 and the second pinch roll 19. In this case, each metal plate 11 is not misaligned, and its edge 12a is always o-
It moves over a certain position on the roller 66. As described above, the elevation angle of the tool 30, the angle with respect to the advancing direction of the metal plate 11, the height, and the cutting angle of the cutting edge can be easily finely adjusted to the optimum coating thickness removal conditions, so that the tool 30 can be substantially Only the coating 3 on the upper corner 12a2 can be removed over a predetermined width (preferably about 0.3 to 0.5 sail). Additionally, as the tool 30 wears, the contact of the tool 30 against the edge 12a can be maintained substantially constant by lowering the tool 30 by turning the handle 56. In addition, the removed powder is completely removed by the vacuum dust collector/spools 21a, 21b and the rotating brush 23, so that it does not remain in the can. The present invention is not limited to the above embodiments, and for example, a rotating tool such as a milling cutter or a glider may be used as the tool 30 instead of the above-mentioned fixed blade.

However, in the latter case, there is a problem that due to rotational vibration, some parts of the coating film are not removed, or if an attempt is made to completely remove the coating film, excessive metal is removed and a large amount of metal powder is generated. Furthermore, without providing the roll 66, the cutting edge 12a of the tool 3 may be left in a free position, but by providing the roll 66, more stable removal is possible. According to the present invention, the coating film on the edge of the metal plate on which the inner surface coating film is formed, which is to become the flange part, on the corner of the cutting edge and the side where no burrs are formed is removed with the aid of a tool. Therefore, there is an effect that enamel hair does not occur in the flange-equipped can body manufactured using the metal plate.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the conventional metal can 8 with a flange in which enamel hair has occurred, Fig. 2 is a perspective view of the metal can Tsukioka body before the formation of the flange shown in Fig. 1, and Fig. 3 is the same as Fig. 2. FIG. 4 is a vertical cross-sectional view along line W-W in FIG. 1, FIG. 5 is a front view of one embodiment of the apparatus of the present invention, and FIG.
The figure is a longitudinal sectional view taken along the line ``-'' in Figure 6, Figure 7 is a side view of an example of a filer equipped with a tool that is an embodiment of the present invention, and Figure 8 is a W-leg in Figure 7. 9 is a front view of the tool and holder seen from the line K-X in FIG. 7, FIG. 10 is a plan view taken from the line X-X in FIG. 8, and FIG.
The figure is a vertical cross-sectional view along the phantom-phantom line in Fig. 7, Fig. 12 is an enlarged view of the main part showing the state in which the tool is in contact with the edge green of the metal plate, and Fig. 1
3 is an explanatory plan view showing an example of a state in which a tool is in contact with the edge of a metal plate; FIG. 14 is a perspective view of a metal can body with a flange portion formed from a metal plate manufactured according to the present invention; 1st
FIG. 5 is a longitudinal sectional view taken along the line XV-XV in FIG. 14. 3...Painted waist, 11...Metal plate, 12a...Edge, 12a. ...Flash, 12a2... Upper corner (end green cutting edge, corner covered with coating film on the side where no burr is formed), 16... Guide, 17... First pinch roll, 19... second pinch roll, 25
...Can body with flange, 26a, 26b...
...Flange part, 30...Tool. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. i3 Fig. l4 Fig. l5 Fig. 7 Fig. 9 Fig. ll Fig. 8 Fig. Rust l○ Fig. l2

Claims (1)

[Claims] 1. A method for manufacturing a metal plate for a metal can body with a flange portion having a coating film formed on the inner surface, wherein the coating film is formed and the edge that is to become the flange portion is cut. When transporting the metal plate with the edge parallel to the transport direction, a tool is brought into contact with the corner covered with the coating film on the side where burrs are not formed during cutting of the edge, and the cutter is cut. A method for manufacturing a metal plate for a metal can body with a flange, the method comprising removing the coating film from the corners. 2. In an apparatus for manufacturing a metal plate for a flange-equipped metal can body on which a coating film is formed on the inner surface, the coating film is formed,
and a first pinch roll, a second pinch roll, and a guide for transporting a metal plate whose end edge to become the flange part has been cut, with the end flattened in the transport direction,
and a transfer means arranged such that the roll center distance between the first pinch roll and the second pinch roll is smaller than the length of the edge of the metal plate, and the first pinch roll and the second pinch roll. A metal with a flange, which is located between the rolls and is provided with a tool that is arranged so as to be able to come into contact with a corner coated with the coating film on the side where burrs are not formed during cutting of the edge. Manufacturing equipment for metal plates for can bodies.