JPH0780581A - Production of welded drum can - Google Patents

Abstract

PURPOSE:To fill a ring-like clearance of the joining part inside a can and to easily wash in a reusing time by welding around the joining part of the drum body after fastening them with winding and a top plate or a bottom plate from the outside. CONSTITUTION:Arc welding is executed with TIG or plasma, etc., at the outside of a can and from the side of a bottom plate 2 of the back side of the drum body 3 while rotating with laterally mounting the drum can fastened with winding after the projection like bottom plate 2 is fit into the drum body 3. A torch 9 is installed in an angle against the bottom plate 2, the drum body 3 and the rotating direction, the arc 10 is generated aiming at a meeting beginning part 14 of the bottom plate 2 and the drum body 3 or at the neighborhood of the bent part of the bottom plate 2. Therefore, because the molten metal is turned around the hanging surface of the bottom plate 2 and filled in the ring like clearance as the groove, the build up welding 15 can be formed without using an additive. The same method as the bottom plate can be also adopted in joining the joining part of the top plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a welded drum can having good cleaning properties.

[0002]

2. Description of the Related Art Conventionally, there are generally two types of steel drums, one of which is an open drum specified in JIS Z 1600 (steel open drum), and the other is JIS Z 1601 (steel drum). Drum) is a sealed drum. These general shapes are shown in FIG. That is, FIG. 5 is a conceptual diagram of a sealed type drum can having a general shape. This drum can is composed of a top plate 1, a base plate 2 and a body 3, and the top plate 1 is further provided with large plugs 4 and small plugs 5. The large stopper 4 is an inlet, and the small stopper 5 functions as a ventilation hole. Based on this structure, the open drum is a container in which a steel plate is formed into a cylindrical shape, and then a body joined by welding and a disc-shaped base plate are wound up, and a removable canopy fitted with a gasket is used to open the body. Placed on the top surface, fitted with a band and fastened to the body with bolts or levers.

Further, the closed type drum is manufactured by winding and fastening a disc-shaped base plate and a top plate having a plug serving as an inlet and a ventilation port on both ends of a body joined by seam welding.
This closed drum is used as a container for various liquids such as petroleum products and chemical products, and the open drum is used as a container for storing and carrying powders, solids, paints, adhesives, synthetic resins and other viscous liquids. To be done. Each of these capacities is from 20L to 200L.

Therefore, it is the actual situation that these containers are used after the contents are once put therein, and then the interior is washed and then repeated again and again. Moreover, the most common steel drums use cold-rolled steel sheets or hot-rolled steel sheets, but in the case of drums that are washed and regenerated and repeatedly used for a long period of time or for special chemicals, they are made of stainless steel sheets. It is canned.

FIG. 6 is an enlarged view of portion A in FIG. Figure 6
According to this, the main plate 2 forms the bottom of the drum, and the lower end of the body 3 and the lower end of the depending peripheral wall of the main plate are wound and fastened.
However, as shown in the figure, at the point where the lower end of the body and the ground plate start to contact each other, the upper portion becomes wider and the lower portion becomes narrower to form an annular gap 13 having a substantially triangular shape. In the case of a closed type drum, a similar gap is created on the top plate side. Further, when the paint, the adhesive, etc. are stored, the contents that have entered the void cannot be easily removed when the drum is cleaned, and the cleaning efficiency is lowered. Further, when the drum can is reused, if the residue of the previous contents remaining in the void portion is mixed in or eluted, it becomes a quality problem as an impurity in the subsequent contents. Further, in the case of a closed type drum, when the contents are taken out, a small amount of the remaining contents may flow out when the drum can is turned upside down, so that a residue may enter the voids of the top plate as in the case of the ground plate. There is.

FIG. 7 shows an improved version of the above drum can. Similar to FIG. 6, FIG. 7 is an enlarged view of the lower end portion of the drum body. As shown in FIG. 7, at the lower end of the drum body, the body 3 and the base plate 2 are butted and welded together, and the ring 6
Are joined together. Such a drum can has been solved in that the annular gap portion into which the contents enter is eliminated as described above. However, in order to butt-weld the fuselage and the main plate, it is necessary to have a high degree of dimensional accuracy and position control at the welding location, and a high precision machining device for the fuselage and main plate or a highly accurate clamping device is required, resulting in high equipment costs. Also, there is a drawback that the work efficiency is low.

Further, FIG. 8 is a sectional view showing a winding portion at the bottom of still another improved drum can. This method is disclosed in JP-A-6
As disclosed in Japanese Patent Publication No. 1-180625, an annular gap in a joint portion of a body and a top plate of a closed type drum is filled from the inside of the drum by overlay welding, and a joint portion of the body and the main plate is bent at a right angle. It proposes a method in which the joining starting portion is joined from the outside of the can body in an annular shape by using seam welding 7 while being formed into a shape and wound. In this drum can, the gap of the winding tightening portion 8 is smaller than that of the conventional drum can, but in reality, it is not sufficient.

In the open drum disclosed in Japanese Patent Laid-Open No. 60-40679, after the lower end of the body and the lower end of the hanging peripheral wall of the inverted dish-shaped base plate are wound and fastened, the drum can is attached to the center shaft of the can. Rotate about the center of the drum, press the roll from the outer circumference of the drum can to form an annular inward projection at the can bottom height position of the body until the inner surface of the body is in close contact with the bottom peripheral edge of the bottom plate. There has been proposed a manufacturing method in which a core wire is fed from the outside of the drum body from the side of the body and is welded by plasma welding and integrated with the core wire.

[0009]

As described above, the conventional technique has a problem in productivity because the manufacturing process is complicated due to the necessity of processing accuracy of the drum can and a highly accurate clamping device. Since the steel plate that is the material of the drum can is a thin plate of 1.0 mm to 1.6 mm,
The welding condition range is extremely narrow and severe welding is required. In other words, since a considerable amount of molten metal is required to fill a void that is several times the plate thickness that is structurally generated by welding, the steel plate cannot be thermally endured and melts down, or due to thermal strain. The drum can deforms during welding and the shape of the void changes,
It is difficult to secure a stable weld shape. Further, it is difficult to completely eliminate the voids at the joining portion by the seam welding method, and the quality is insufficient.

[0010]

[Means for Solving the Problems] As a result of the inventors' efforts to solve such problems, as a result of filling up the annular gap portion formed between the body and the main plate or the top plate by overlay welding. Thus, a method for manufacturing a welding drum can which eliminates the annular void portion in the drum can and is easily washed without the residue of the already stored contents remaining in the void in the washing process when reusing is proposed. It is a thing. The gist of the invention is as follows: (1) A base plate or a top plate formed in a convex shape inside the drum or a top plate and a bottom plate are fitted into a body and wound, and then the drum body and the base plate or the top plate or top plate. And a method for producing a welded drum can, characterized in that the vicinity of the joint with the main plate is outside the drum body, and the inner surface of the main plate or the top plate or the top plate and the main plate side is arc-welded to build up inside the can.

(2) A base plate or a top plate formed into a convex shape inside the drum is fitted into the body and wound up, and then an annular gap is welded up from the inside of the drum can body, and the other top plate or the base plate is drum can. A method for producing a welded drum can, characterized by performing build-up welding on the inner surface by welding from the outside of the body. (3) The bottom plate or top plate formed in a concave shape inside the drum is wound around the body, and then the outside of the drum can body is arc welded around the joint between the drum body and the bottom plate or top plate to build up the inside of the can. A method for manufacturing a welded drum can, which is characterized in that

[0012]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing the production of a welding drum according to the present invention. As shown in FIG. 1, while the body 3 of the drum is laid sideways on a turntable, the drum formed by the usual method is rotated, and the outside of the drum can body and the bottom plate side of the body (upside down). The same applies to the case of performing), arc welding of TIG or plasma is performed. When viewed from the outside of the drum, the welding is rotated clockwise while the welding torch is at an angle of 30 ° to 50 ° with respect to the surface of the main plate, and an angle of 95 ° to 100 ° with respect to the traveling direction of the drum. And clock dial 7
The welding torch 9 is set at the positions 8 to 8 to perform the downward welding.

That is, as shown in FIG. 1, the welding arc 1
0 aims at the meeting start part 14 of the drum body and the main plate, or near the bent part of the main plate. Further, a cooling plate 11 made of a copper roll or a copper plate is provided on the outer side of the body opposite to the welded part for cooling. In the case of TIG welding, the welding current is 20
0-300A, 100-200A for plasma welding
At this time, the welding speed is 100 to 400 mm and an appropriate internal buildup can be obtained.

According to the method of the present invention, welding is performed at a portion where the body of the drum and the steel plate of the base plate are in contact with each other, so that the steel material thickness of the drum is 1.2 mm for both the body and the base plate.
Then, since the fuselage and the steel plate of the ground plate are laminated at the contact portion 13, it is 2 mm of 1.2 mm in terms of heat capacity.
This is equivalent to double welding of a 2.4 mm thick steel plate, and it is less likely to cause perforation, and the welding condition range is wider than that of a 1.2 mm thick plate. In this method, even if there is no filler metal, the molten metal wraps around the hanging wall surface of the base plate and fills the annular void as a groove wall, so that the effect of forming the buildup 15 inside is recognized. However, as a result of the metal that melted the hanging wall surface of the main plate wrapping around the annular gap, the steel plate thickness on the hanging wall surface of the main plate becomes thin.To prevent this, welding is performed using a filler metal. Metal can be supplemented to the thinned part of the steel plate.

In order to make the action of the molten metal flowing in and filling the annular void more effective, welding in the downward direction is carried out at the position of the welding torch as described above at the position of 7-8. desirable. That is, at a position where the welding torch position is higher than 8 on the timepiece, the molten metal drips more directly below than filling the void portion smoothly, so that a partially acute bead shape is formed and it is difficult to fill the void portion smoothly. On the other hand, when welding is performed at a position lower than 7 on the timepiece or when traveling upward, the weld metal does not properly wrap around the void, and intermittent beads cannot be formed to sufficiently fill the void.

In the method of the present invention, since the steel plate on the ground plate side melts and fills the voids, some molten dents may remain, but since it is the back of the fuselage on the ground plate side, it is difficult to see it from the outside of the drum. There is no problem in terms of appearance quality. Since the outside of the drum body is cooled and protected by a cooling ring or the like and welded, it has the effect of preventing perforation due to melting and preventing deterioration of the appearance. Furthermore, instead of rotating the drum horizontally, the drum may be rotated with a slight tilt so that the ground plate to be welded has an obliquely upper surface, but if the degree of tilt increases the melting will be the same as the above result. Since the metal does not wrap around into the void and it becomes difficult to secure a good bead shape, the tilt of the body axis with respect to the horizontal plane is limited to about 30 °.

In the above description, both the body and the steel plate of the base plate have the same thickness of 1.2 mm. However, as described above, the steel plate on the base plate side is welded and the molten metal wraps around the base plate side. Since the gap is filled, the thicker the steel plate on the base plate side, the better the welding result. Therefore, the body is 1.2 mm, and the thickness of the base plate or top plate or top plate is 1.6
The welding conditions are more stable and good when a drum made into a can of mm is used. It is also possible to weld the outer side of the drum body from the body side by applying an arc to the contact part between the body and the ground plate, but in this case, the hollow of the molten part remains on the outer side of the body and It is not preferable in terms.

In the case of plasma welding, the shield gas is a mixed gas containing 100% argon gas or 3 to 20% hydrogen. As the pilot gas, a mixed gas obtained by adding 3 to 5% hydrogen to argon gas is used. When hydrogen is mixed with argon gas, the arc converges and the arc temperature rises, so it is better to increase the mixing ratio of hydrogen gas when increasing the welding speed. In order to prevent air oxidation of the built-up portion inside the drum, it is desirable to shield the drum can with argon gas or nitrogen gas.

FIG. 2 is a view showing a welding state of the winding tightening portion according to the present invention. As shown in FIG. 2, after the inner plate and the body, which are formed in an inwardly concave shape, are fastened by winding, plasma welding is performed by applying the welding arc 10 to the winding fastening portion from the outside of the can body. Of the steel sheet melts and flows out to form a buildup 15 that fills the voids inside. In this case as well, since the winding tightening part is a part where the body and the steel plate of the base plate are laminated in two layers, the heat capacity is the same as in the case of welding a 2.4 mm thick steel plate that is double even with a 1.2 mm thick drum. As described above, burn-through is less likely to occur, and the range of welding conditions becomes wider. In this method, a molten dent remains on the outside of the fuselage, but such an outwardly convex ground plate is unstable when the drum is upright,
In practical use, a ring-shaped ring 12 (referred to as a cover ring or a skirt ring) is fitted and fixed by welding as shown in FIG. 3 for reinforcement and stabilization of the can. Therefore, there is no problem because the welding depression becomes invisible. That is, FIG. 3 is a view showing the drum in the state in which the cover ring according to the present invention is provided. As shown in FIG. 3, the drum is welded and fixed with a cover ring 12 for stabilizing the can. However, in this method, the position of the welding torch is preferably 1 or 2 on the dial of the timepiece. Other conditions are the same as in the case of FIG.

In the present invention, both the method shown in FIG. 1 and the method shown in FIG. 2 can be directly applied to an open drum, but various combinations are conceivable in the case of a closed can. That is, one is a method of performing the method of FIG. 1 on both the top plate side, and two is a method of performing build-up welding from the inside of the can on the top plate side or the bottom plate side, and then tightening the bottom plate side or the top plate side. This is a combination method in which welding is performed from the outside of the can body by the method of FIG. 1 later. Alternatively, one of the top plate side and the ground plate side is the method of FIG. 1, and the other is the FIG.
It is a method of welding by the method. These can be arbitrarily selected depending on the required drum shape, quality, allowable manufacturing cost, and the like.

Laser welding, MIG welding, TIG welding, and plasma welding are available as welding methods, but laser welding is difficult in terms of drum can-making accuracy, and MIG or TIG welding is also possible, but heat penetration is also possible. From the depth, plasma welding is the most stable and can be welded at high speed.
TIG welding requires a slightly higher current. In addition, FIG. 4 is a view showing another processing state for welding according to the present invention. That is, as shown in FIG. 4, a roll is pressed from the outside of the body at the height position of the main plate against the drum manufactured by the usual manufacturing method so that the body 3 is brought into close contact with the peripheral portion of the main plate 2. If such a process is performed, the cross-sectional area of the annular void portion becomes small, so that there is an effect that the padding can be further performed inside.

[0022]

【Example】

Example 1 An example of a drum according to the present invention will be specifically described with reference to FIG. As shown in Fig. 1, a can made by a normal method and a top plate with a stainless steel drum having a thickness of 1.5 mm are placed on the turntable with the body of the drum lying down, and the can is turned on the drum main plate side while rotating clockwise. Downward welding by plasma arc was performed from the outside of the body. The welding torch has an angle of 4 with respect to the main plate surface.
It was fixed at 0 °, at an angle of 100 ° with respect to the traveling direction of the drum, at position 7 on the clock dial. The welding arc point was aimed at the starting point of the meeting between the drum body and the ground plane. Argon gas was used as the shield gas, and argon-3% hydrogen mixed gas was used as the pilot gas. Nitrogen gas was used as the shield gas on the inner surface of the drum. During welding, the outside of the body was cooled by a copper plate. Welding conditions are welding current 180A, welding speed 30cm
Welded at / min. Further, the top plate side was similarly welded. After the welding was completed, the welded portion was cut out and subjected to a cross-section inspection. As a result, the welded metal filled the annular void portion and had a smooth shape.

Example 2 An open drum, which is a can made by winding a body having a thickness of 1.2 mm and a base plate having a thickness of 1.6 mm molded into an inwardly concave shape as shown in FIG. While performing downward welding by plasma arc. The welding torch was fixed at an angle of 70 ° with respect to the body surface, an angle of 105 ° with respect to the traveling direction of the drum, and a position of 1 on the clock dial. The welding arc aimed at the meeting start point between the fuselage and the ground plane. Welding current 200A, welding speed 40cm / min, shield gas is argon-7
% Hydrogen mixed gas, Argon-3% hydrogen mixed gas was used as the pilot gas, and the inner shield gas was not used. During welding, the outside of the body was cooled by a body roll. After the outer welding of the base plate, a 2.3 mm thick cover ring was attached by fillet welding. After the welding was completed, the welded portion was cut out and subjected to a cross-sectional inspection. As a result, it was found that the molten metal filled the annular void portion and had a smooth shape.

Comparative Example 1 After the melamine alkyd resin paint is stored in the conventional drum shown in FIG. 5, the paint in the drum is taken out. The inner surface of the drum with the paint adhered to the inner wall of the can was washed with a 15% aqueous caustic soda solution at a temperature of 80 ° C, followed by high-pressure hot water washing at 60 ° C and steam washing, and the inside of the can was completely dried with hot air at 230 ° C. . In the inspection result of the inside of the joining portion of the body and the main plate after cutting the drum, no paint residue was found in the cans of Examples 1 and 2, but in the conventional drum, the paint residue remained behind the void. , Complete cleaning was difficult.

[0025]

As described above, in the drum of the present invention, as compared with the conventional drum, the joint between the base plate and the body has a significantly improved cleaning property by filling the annular void portion by plasma welding. The number of times the drum is repeatedly regenerated and used is dramatically improved, and the productivity and the production cost are greatly improved as compared with the conventionally proposed can-making method for the same purpose.

[Brief description of drawings]

1 is a cross-sectional view showing the production of a welding drum according to the present invention,

FIG. 2 is a diagram showing a welding state of a winding tightening portion according to the present invention,

FIG. 3 is a diagram showing a drum with a cover ring according to the present invention.

FIG. 4 is a view showing a processing state for another welding according to the present invention,

FIG. 5 is a conceptual diagram of a closed type drum can showing a general shape,

6 is an enlarged view of a portion A of FIG. 4,

FIG. 7 is an enlarged view of the lower end of the drum body,

FIG. 8 is a view showing the bottom shape of still another improved drum can.

[Explanation of symbols]

 1 Top plate 2 Main plate 3 Body 4 Large plug 5 Small plug 6 Ring 7 Seam welded part at the joint start part 8 Tightening part 9 Welding torch 10 Welding arc 11 Cooling plate 12 Covering ring 13 Annular void part 14 Meeting start part 15 Meat Prime

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[Procedure amendment]

[Submission date] September 20, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Yoshinori Shiogetsu 5-7-1 Nishihashimoto, Sagamihara City, Kanagawa Prefecture, Nippon Steel Drum Co., Ltd. Technical Center (72) Innovator Nobutaka Yurioka 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Co., Ltd. Technology Development Headquarters (72) Inventor Hideo Sakurai 20-1 Shintomi, Futtsu City, Chiba Shin Nippon Steel Co., Ltd. Technology Development Headquarters

Claims (3)

[Claims] 1. A bottom plate or a top plate or a top plate formed in a convex shape inside the drum and a top plate and a bottom plate are fitted into a body and tightened, and then a vicinity of a joint between the drum body and the bottom plate or the top plate or the top plate and the bottom plate. A method for producing a welded drum can, characterized in that the metal is built up inside the can by arc welding from outside the drum can and from the base plate or the top plate or the top plate and the base plate side. 2. A convexly formed base plate or top plate inside a drum is fitted into a body and wound and tightened, and then an annular gap portion is welded to the inside of the drum can body by welding, and the other top plate or base plate is drum can. A method for manufacturing a welded drum can, characterized by performing build-up welding on the inner surface by welding from the outside of the body. 3. After the inner plate or top plate formed in a concave shape inside the drum is fastened to the body, the drum can body is then arc-welded from the outside of the drum body to the inside of the can. A method for manufacturing a welded drum can, which is characterized by being padded.