JPH0811261B2 - Method and apparatus for bottoming a bottle-shaped metal container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for seamlessly forming the bottom of a thin-walled and / or deep-bottomed bottle-shaped metal container that cannot be deep-drawn, from a metal pipe material.
It relates to a device therefor.

[0002] For example, a pressure vessel (firefighting unit) which is a typical thin-deep type bottle-shaped metal container, the division of the upper half unit, such as in FIG. 8 (1) lower half unit body (2) It consists of a body, butt welded to each other. (3) is upper half body (1)
A base integrally welded to the center of the opening of the base, (4) a leg seat welded to the bottom of the lower half body (2), (5), (6)
Indicates those welds.

[0003] That is, the fire extinguishing device is thin article about 1.6 mm, and since a considerable deep products, it is impossible to completely deep-drawn in its entirety from a single flat metal plate material Is. If it is assumed that a single metal pipe material is used for processing, it is necessary to weld it on the bottom of the pipe, so that a product that can withstand the internal pressure of this type of container cannot be obtained, and wrinkles are likely to occur on the bottom. It is also impossible to finish it in a precise molding state.

[0004] Therefore, hits in the conventional producing extinguishing device, by punching a thin flat metal plate material such as previously Dzu the circular, after repeated drawing of the next few stages, trimming the molded article By processing, a pair of the upper half body (1) and the lower half body (2) is individually created, and finally both of the body bodies (1) and (2) are butt-welded together. is there. (7) shows the butt weld.

[0005]

However, in such a method, since it is necessary to punch a metal flat plate material into a circular shape, a material loss of about 30 to 35% occurs.
Inferior in material saving effect.

[0006] Further, since the butt welding work of the above-mentioned both bodies (1) and (2) is indispensable, it is necessary to undergo the pressure test without fail in order to secure the safety and reliability of the pressure vessel. , Yield is also bad.

[0007] Furthermore, if a common press forming machine for punching or drawing is used, the 雖 also needs many steps, and there is a problem that high quality and mass production effect cannot be expected to the maximum.

[0008]

The present invention SUMMARY OF] The contemplates drastic solve such problems, this type pressure vessel (extinguishing device) for its or bottom with the processing method other bottle-shaped metallic container As a positional relationship, one end side or a midway portion of the metal pipe material to be the target container is fixed and held, and a fixed bending margin portion to be the bottom part of the target container is left on the other end side of the pipe material as the other end side. After fitting the core for molding the bottom part to it, rotate the pipe material at a constant speed, and locally heat the bending margin of the pipe material during the rotation. It is characterized in that it is pressed from the outside in the diametrical direction by a roller for forming the bottom part, and is bent and deformed inward until it comes into close contact with the core, and is fused and integrated into its final seamless state,

As an apparatus for carrying out the above method, a chuck for fixing and holding one end side of a metal pipe material as a target container so as to be able to integrally rotate with a rotary main shaft of a rotary drive machine, and tightening by the chuck An internal restraining core metal fitted to one end of the pipe material and a certain bending margin to be the bottom of the target container are left on the other end of the pipe material so that the pipe material is not deformed illegally even if it receives a fixing force. In order to locally heat the bending margin part to the other end side of the pipe material fixedly held by the chuck and the bottom molding core fitted in the connection state with the core metal as a positional relationship. With a gas burner and other heaters,
Similarly, on the other end side of the pipe material fixedly held by the chuck, a bottom forming roller capable of advancing and retreating, which is pressed to press the bending margin portion from the outside in the diametrical direction, is formed. During rotation,
The bending margin portion on the other end side is locally heated by the heater, and the bending margin portion is pressed by the roller that is advanced toward this end, and is turned inward until it comes into close contact with the core. It is characterized in that it is bent and deformed, and is set so as to be fused and integrated in the final seamless state.

[0010]

According to the bottoming processing method of the present invention, the metal pipe material to be the target container is fixed and held, and the bottom molding core is fitted to the end side to be the bottom portion of the pipe material, and the pipe material is rotated. While doing, while locally heating the bending margin on the end side locally, from the outside in the diametrical direction of the pipe material, a pressing force is applied by the bottom forming roller to form the bending margin. Since it is plastically deformed inwardly bent until it comes into close contact with the core, and is welded and integrated into the final seamless state, the bottom of the target container is accurately and efficiently made of metal pipe material. can be molded using a particular bottom with the processing of fire extinguishing devices and other thin-deep type pressure vessel, is greatly beneficial, excellent in mass production.

Also, as the bottoming processing apparatus, according to the above-mentioned structure, the metal pipe material to be the target container can be rotated by using a generally simple and sufficient rotary drive machine. In addition, since the internal restraining core bar can also be fitted to one end of the pipe material that is the mouth of the purpose container in a state of being connected to the bottom molding core, the above pipe material is illegal. It is possible to easily obtain a highly accurate bottom part molding state of the target container without fear of deformation.

[0012]

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to the accompanying drawings, FIG. 1 extinguishing device as thin-deep type pressure vessel is an example of Binjo metal container (hereinafter, referred to as object container.) 2 to 4 show the bottoming processing steps, respectively.
(M) is a metal pipe material such as steel (SS41) that becomes the target container (A), and has a diameter dimension (D) of about 127 mm and about 1.6 m, which is equal to the target container (A).
It has a wall thickness dimension (T) of m, and its length dimension (L) is preliminarily determined to be long in consideration of the bending margins of the mouth portion (11) and the bottom portion (12) of the target container (A). Has been.

Reference numeral (13) is a chuck attached to a rotary main shaft (not shown) of the rotary drive machine so as to be integrally rotatable, and together with the holding claw (14) of the metal pipe material (M). Hold one end side in a fixed state and move the metal pipe material (M) at a constant speed (for example, about 1000 rpm).
It is designed to rotate under.

In that case, one end side of the metal pipe material (M) will later become the mouth portion (11) of the target container (A) and needless to say, since it is in an open state, a core metal (15) is fitted therein. By restraining the metal pipe material (M) from the inside as well, even if it receives the tightening fixing force of the pressing claw (14), it is prevented from being deformed illegally.

On the other hand, on the other end side of the metal pipe material (M), a fixed bending margin portion (16) which will later become the bottom portion (12) of the target container (A) is left in an immersed state for forming the bottom portion. Fit the core (17). The length (W1) of the bending margin (16) is approximately equal to the radial dimension of the metal pipe material (M), and is, for example, about 63 mm. The target container (A)
When the bottom portion (12) of the core (12) is molded into a stepped shape or a concave curved shape, the shaping surface of the core (17) may be shaped into a shape corresponding to these.

Reference numeral (18) is a core rod for connecting the core metal (15) for restraining the inside of the pipe material (M) and the core (17) for molding the bottom portion. It is easy to fit into the hollow inside of the metal pipe material (M) and the core rod (18) that mediates it is achieved.
It is possible to omit the above and form the core metal (15) and the core (17) as a thick continuous single piece as a whole. The mandrel (18) may be shaped as, for example, a turnbuckle to provide an adjustment function to accommodate changes in the length dimension (L) of the metal pipe material (M).

Further, (19) is the metal pipe material (M).
Is a bottom forming roller supported on the other end side of the circumferential body surface (20) so as to face from the diametrical direction thereof, and is linear toward the bending margin portion (16) to the bottom portion (12). It is designed to be moved back and forth. Then, when this comes into contact with the metal pipe material (M), the metal pipe material (M) integrally swings.

(21) is the bottom molding roller (1
9) As a positional relationship that does not interfere with the metal pipe material (M), the circumferential surface (20) of the other end of the metal pipe material (M) is a gas burner or other heater facing from the diametrical direction thereof, and the bottom portion ( The bending margin (16) to 12) is locally heated to a constant temperature (for example, about 1000 ° C.). The heating temperature may be appropriately selected in consideration of the type of the metal pipe material (M), the wall thickness dimension (T), etc. as long as the bottom portion (12) of the target container (A) can be welded in a seamless state.

In the heater (21), not only the circumferential barrel surface (20) of the metal pipe material (M), but also the bottom portion (12) of the target container (A) from the circumferential barrel surface (20) is used. Up to a certain position, it is supported by a circular arc-shaped slide guide rail (22) that bends at a constant angle (θ) of about 45 to 90 degrees, and it is determined that the slide guide rail (22) can be moved along the guide rail (22). preferable.

Then, the heater (21) always orients the bending margin portion (16) which bends and changes inwardly with time, and makes only the bending margin portion (16) highly efficient without loss. This is because it can be softened by heating. This can be done by controlling the movement of the heater (21) in association with the forward / backward movement of the bottom forming roller (19).

In carrying out the bottoming processing of the target container (A) using the processing apparatus as described above, one end side of the metal pipe material (M) is attached to the rotary drive machine as shown in FIG. After being fixedly held to the rotating main shaft via the chuck (13), it is rotated at a constant speed by the rotating main shaft.
In the hollow interior of the metal pipe material (M), it is a matter of course that the metal core (15) for restraint and the core (17) for forming the bottom portion are fitted in advance, and therefore these pipe materials are also used. It rotates together with (M).

Then, the bending margin portion (16) on the other end side of the rotating metal pipe material (M) is locally and momentarily softened by a heater (21) facing it, as shown in FIG. On the other hand, the bending margin portion (16) is pressed from the outside in the diametrical direction by the bottom forming roller (19) advancing toward the bending margin portion (16).

At this time, as apparent from FIGS. 3 and 4, when the bottom forming roller (19) is gradually advanced, the other end of the metal pipe material (M) in the open state is subjected to bottom forming. Since the child (17) is bent and deformed inward so as to be in close contact with the shaping surface of the child (17), the heater (21) also corresponds to the change and the heater (21) also has a circumferential cylinder in the original metal pipe material (M). From the surface (20), the bottom (1
2) Gradually move to the target angular position.

Then, since the bending margin portion (16) of the metal pipe material (M) is being heated, it is bent inward largely under a relatively small pressing force of the bottom forming roller (19). Will be plastically deformed into a state,
Finally, the welding is integrated into a seamless state as shown in FIG. 4, and the bottoming action is instantly completed.

Further, since the metal pipe material (M) is rotating and the bottom forming roller (19) for pressing the circumferential body surface (20) of the metal pipe material (M) also rotates together with the bottom forming roller (19). In addition, the other end side of the metal pipe material (M) is constrained from the inside by a bottom molding core (17) so that the bending margin portion (16) having the constant length (W1) is maintained. Then, the bottom portion (12) of the target container (A) can be molded with high precision.

Further, since the bending margin portion (16) of the metal pipe material (M) is locally heated, there is no fear of wrinkling or cracking due to its bottoming action, and the wall thickness dimension (T). ) Will be finished in a stable and uniform molding state. Since the bottom forming roller (19) rotates together with the pipe material (M) as described above, there is no possibility of giving a resistance to the rotation of the pipe material (M).

After the bottoming process is completed, the bottom forming roller (19) is retracted as shown in FIG.
The heater (21) is also returned to the initial position, the metal pipe material (M) is removed from the chuck (13) whose rotation has been stopped, and the core metal (15) and the core (17) are also extracted from the inside.

In the illustrated embodiment, one end side of the pipe material (M) is described as being fixedly held by the chuck (13) on the rotary main shaft of the rotary drive machine, but the longitudinal direction of the pipe material (M) is described. The intermediate part may be fixedly held by an appropriate means and rotated integrally with the rotating main shaft.

In any case, after completion of the bottoming process, the metal pipe material (M) is reversed in the opposite direction, and one end side of the target container (A), which becomes the mouth portion (11), is continued. The plastic working is performed as follows.

That is, although FIGS. 5 to 8 show the processing steps, the other end of the previously processed metal pipe material (M) is connected to the rotary main shaft of the rotary drive machine as shown in FIG. After holding it in the fixed state by the check (13),
The spindle rotates at a constant speed.

In that case, the other end side of the metal pipe material (M), which has been bottomed, is in a closed state with high rigidity.
Even if it receives the tightening fixing force of the presser pawl (14), it is not likely to be deformed illegally, and therefore it is not necessary to fit the restraining core metal (15) inside the hollow.

Reference numeral (23) is a core for molding the mouth portion, which faces the one end side of the metal pipe material (M) in an open state and is moved forward and backward along the rotation axis thereof. Further, (24) is also a mouth forming roller, which faces the circumferential body surface (20) on one end side which becomes the mouth portion (11) of the target container (A), and the mouth portion (11) Aiming at the bending margin portion (25), it is possible to move forward and backward along the diametrical direction and move along the longitudinal direction of the pipe material (M). (W2) suggests a certain length of the bending margin portion (25).

Then, while the metal pipe material (M) is being rotated, the mouth forming core (23) is moved toward the one end side which becomes the mouth portion (11) of the target container (A) as shown in FIG. On the other hand, the mouth forming roller (24) is also advanced so that the bending roller (24) presses the bending margin portion (25) on the one end side of the metal pipe material (M) from the outside. At the same time, while applying the pressing action, the forming roller (24) is also moved along the longitudinal direction of the metal pipe material (M) as shown in FIG.

Then, one end side of the metal pipe material (M) is efficiently used as a mouth portion (11) having a shape, a diameter dimension and a length dimension corresponding to the shaping surface of the mouth molding core (23). It will be plastically deformed with good precision. After that, as in the prior art, the mouth portion (11) is threaded for plugging, and the bottom portion (12) after the pre-processing is performed.
By welding the installation leg seat (26) to the above, the target container (A) as shown in FIG. 1 is completed.

[0035] Incidentally, the comparison with the prior art in the illustrated embodiment technique, has been described by way of the pressure vessel (extinguishing device) as an example, deep drawing thin non non pressure vessels processing or / and deep It goes without saying that the present invention can be widely applied to mold bottle-shaped metal containers.

[0036]

As described above, according to the bottoming processing method of the present invention, one end side or the middle part of the metal pipe material (M) which becomes the target container (A) is fixed and held, and the pipe material (M) is also fixed. As a positional relationship for leaving a constant bending margin portion (16) which becomes the bottom portion (12) of the target container (A) on the other end side, a bottom molding core (17) is fitted on the other end side, and the pipe is then fitted. The material (M) is rotated at a constant speed, the bending margin (16) of the pipe material (M) is locally heated during the rotation, and the bending margin (16) is formed at the bottom. Pressing roller (19) from the outside in the diametrical direction to bend and deform inward until it comes into close contact with the core (17),
Since it is designed to be fused and integrated into its final seamless state, it is possible to reliably solve the problems of the prior art mentioned at the beginning, and it is possible to perform thin drawing or / and deep bottom where deep drawing was impossible. There is an effect that the bottom portion of the mold bottle-shaped metal container can be processed extremely easily and efficiently from the metal pipe material (M) in a highly accurate seamless molding state.

That is, since the target container (A) is bottomed at once from the metal pipe material (M), there is no material loss as compared with the conventional method of drawing from a flat metal plate material. Further, unlike the conventional case, since it is not necessary to perform the butt welding work on the upper half body (1) and the lower half body (2) after the draw forming, the yield is improved and the target container (A) can be obtained. The quality and workability are extremely excellent.

In particular, during the rotation of the pipe material (M), the bending margin (16) which becomes the bottom (12) of the target container (A) is heated so that the bending margin (16) is bottomed. Since it is a method of applying a pressing force of the molding roller (19), bending and deforming it inward, and welding and unifying it in the final seamless state, safety and reliability capable of withstanding internal pressure are required. is applied to the fire extinguishing devices and other pressure vessel that,
It can be said that it is very effective.

Further, as an apparatus for carrying out the above method, in the present invention, one end side of the metal pipe material (M) which is the target container (A) is fixed so as to be integrally rotatable with the rotary main shaft of the rotary drive machine. A chuck (13) to be retained, and an internal restraining cored bar (15) fitted to one end of the pipe material (M) so as not to be deformed illegally even if the chuck (13) receives a tightening fixing force. Similarly, the pipe material (M) is fitted to the other end side so as to leave a constant bending margin portion (16), which is the bottom portion (12) of the target container (A), and to be connected to the core metal (15). At the other end of the attached bottom molding core (17) and the pipe material (M) fixedly held by the chuck (13), the bending margin (16) is locally heated. Gas burners and other heaters (2 ) And, like the chuck (13)
A bottom forming roller (19) capable of advancing and retreating, which is provided to press the bending margin portion (16) from the outside in the diametrical direction on the other end side of the pipe material (M) fixedly held by During the rotation of the pipe material (M) by the rotating spindle, the bending margin portion (16) on the other end side is locally heated by the heater (21), and the bending margin portion (16) is The roller (19) is advanced toward the core, and is bent and deformed inward until it comes into close contact with the core (17), and the final seamless state is welded and integrated. Therefore, the required structure is remarkably simple and sufficient, and the maximum mass production effect can be expected.

Further, an inner restraining core metal (15) is provided at one end of the metal pipe material (M) which is the target container (A), and a bottom forming roller (19) is provided at the other end of the metal pipe material (M). Since the pipe material (M) can be effectively prevented from being improperly deformed, the bending margin portion (16) serving as the bottom portion (12) of the pipe material (M) can be effectively prevented from being deformed.
1) can also be specified accurately, and the roller (1
Combined with the fact that 9) can rotate together with the rotation of the pipe material (M), there is an effect that the bottom portion (12) of the target container (A) can be molded with high precision.

[0041]

[Brief description of drawings]

1 is a side cross-sectional view illustrating the extinguishing unit according to purpose container of the present invention.

FIG. 2 is a partially cutaway side view showing a state in which the metal pipe material of the target container is fixedly held on a rotating main shaft.

FIG. 3 is a partially cutaway side view showing a working state of bottoming processing from a metal pipe material.

FIG. 4 is a partially cutaway side view showing a state where the bottoming working operation is completed.

FIG. 5 is a partially cutaway side view showing a state in which the metal pipe material after the bottoming process is placed in the reverse direction and is fixedly held on the rotating main shaft.

FIG. 6 is a partially cutaway side view showing a working state of a mouth portion of a target container.

FIG. 7 is a partially cutaway side view showing a state in which the mouth portion is completely processed.

8 is a side sectional view showing a conventional the firefighting unit corresponding to FIG.

[Explanation of symbols]

 (12) -Bottom (13) -Check (15) -Internal restraining core (16) -Bending margin (17) -Bottom molding core (19) -Bottom molding roller (20) -Cylinder Surface (21), heater (22), slide guide rail (A), target container (M), metal pipe material

Claims (2)

[Claims] 1. A metal pipe material (M) to be the target container (A) is fixedly held at one end side or a midway part thereof, and at the other end side of the pipe material (M), a bottom part (12) of the target container (A) is also provided. ), A bottom molding core (17) is fitted on the other end side, and the pipe material (M) is rotated at a constant speed. , The bending margin (16) of the pipe material (M) during its rotation
Is locally heated, and the bending margin (16) is pressed from the outside in the diametrical direction by the bottom forming roller (19) to be bent and deformed inward until it comes into close contact with the core (17). A method for bottoming a bottle-shaped metal container, which comprises melting and unifying the final seamless state. 2. A chuck (13) for fixedly holding one end of a metal pipe material (M) to be a target container (A) so as to be integrally rotatable with a rotary main shaft of a rotary drive machine, and the chuck (13). The internal constraining mandrel (15) fitted to one end of the pipe material (M) and the other end of the pipe material (M) are connected to the target container so that they will not be deformed illegally even if they are subjected to a tightening fixing force. A bottom molding core (17) fitted in a state of leaving a constant bending margin (16) to be the bottom (12) of (A) and in a connected state with the core metal (15); At the other end of the pipe material (M) fixedly held by the chuck (13), a gas burner or other heater (2) is provided to locally heat the bending margin portion (16).
1) and a bottom molding capable of advancing and retreating, which is provided to press the bending margin portion (16) from the outside in the diametrical direction on the other end side of the pipe material (M) which is also fixedly held by the chuck (13). And a roller (19) for the pipe, and while the pipe material (M) is being rotated by the rotating spindle, the bending margin portion (16) on the other end side is connected to the heater (2).
1) Locally heated by (1), the bending margin (16)
The roller (19) which is operated toward this
Bottom of a bottle-shaped metal container characterized by being pressed and deformed inwardly until it comes into close contact with the core (17), and is welded and integrated into the final seamless state. Processing equipment.