JP5693353B2 - Can body manufacturing apparatus and can body manufacturing method using the manufacturing apparatus - Google Patents

Description

  The present invention relates to an apparatus for manufacturing a can body such as a hot water storage tank manufactured by joining a body of a thin metal member and an end plate, and a method for manufacturing a can body using the apparatus.

In recent years, hot water storage hot water heaters are equipped with large-capacity metal hot water storage tanks for storing heated hot water, but the structure of the can of the hot water storage tank is generally a fuselage. A can body is formed by welding a bowl-shaped part called an end plate over the entire circumference at both ends of a cylindrical part called a main body. With respect to this circumferential welding, conventionally, welding methods including joints and can manufacturing apparatuses having various shapes have been studied.
In order to extend the life of the can body, it is desirable to use a butt joint having no gap in the welded portion. In general, butt welding of thin plates requires strict management of gaps between joints and displacements in the thickness direction (mistakes, that is, displacement in the thickness direction of two plates). From such a viewpoint, it is a tank welding apparatus that fits and welds a lid member to an opening end portion of a body member, and corrects the opening end portion and the rising portion of the lid member, and also has a cylindrical shape that fits together. A correction jig is provided, and the correction jig communicates with the trunk member correction section, and a trunk member correction section in which the inner peripheral surface is gradually reduced in diameter in the insertion direction of the opening end and the opening is inserted and corrected. The inner peripheral surface is gradually reduced in diameter in the insertion direction of the lid member, and is formed and fitted between the lid member correction member that inserts and corrects the rising portion, and the trunk member correction portion and the lid member correction portion. A technique is shown that includes a positioning step portion that locks and positions the tip of either the open end portion or the rising portion and that fits the other end into one (for example, Patent Document 1).

JP 10-099993 A

However, in the technique disclosed in Patent Document 1, the correction jig interferes with the welding torch in order to perform circumferential welding. Therefore, in order to maintain the fitting state between the end plate and the fuselage, several points are temporarily welded in the circumferential direction. As a result, work time increases. Further, when the rising portion is temporarily fixed and welded, the rising portion is melted and the rising portion disappears, so that the welding state is changed only at the temporary attachment portion during circumferential welding, and welding failure occurs.
Furthermore, although this correction jig is corrected in the circumferential direction, it is not forced in the rising direction, so the parallelism of the opening end of the mirror plate and the fuselage and the parallelism of the left and right mirror plates are not secured, and partially A gap is formed between the rising part of the end plate and the opening end of the body, and welding is burned out. In addition, there are several holes for temporary fixing welding in the correction jig, and there is a problem that there is no restriction in the radial direction at that portion, the end plate and the body are mistaken, and the fatigue strength is weakened.

This invention was made to solve the above problems, the butting portion of the body and the end plate is not covered with the correction jig, the joining device of the butting portion, for example, the welding torch does not interfere, Therefore, it is an object of the present invention to provide a can body manufacturing apparatus and a can body manufacturing method using the manufacturing apparatus, which can eliminate the need for temporary fixing welding and maintain the pressed and butted state of the butted portion. To do.

A first aspect of the present invention is a can manufacturing apparatus for manufacturing a can body by joining a body and an end plate, wherein the can body manufacturing apparatus supports end panels disposed on both sides of the body, respectively. 1 correction jig , 2nd correction jig, rotation drive unit arranged on the outside of the 1st correction jig, and pressure unit arranged on the outside of the 2nd correction jig And
The opening of the end plate is formed at the bottom of the stepped portion provided in the horizontal axis direction on the inner diameter side of the correction ring by the correction ring provided in each of the first correction jig and the second correction jig. abut the rising portion rear face, abutting and correct the rising portion front surface of the body at both ends by pressure, the pressurized fuselage of the support accuracy together a raised portion front surface of the opening of the end plate of the pressure unit, The correction ring is moved by the guide unit provided in each of the first correction jig and the second correction jig , and the bottom of the stepped portion is detached from the rear surface of the rising portion of the opening portion of the end plate to make a butting. After the space is formed in the upper part of the part, the body, the end plate, the first correction jig , and the second correction jig can be integrally rotated by the rotation drive unit.

2nd invention uses the manufacturing apparatus of the can body by 1st invention, The body by the rotational drive unit, the end plate provided in the both ends of this body, The 1st correction jig which supports this end plate, This is a method of joining the raised portion of the body pressed and abutted against the butted portion of the raised portion of the opening of the end plate while the second correction jig is rotated integrally.

Since the first invention employs the configuration as described above, when the body and the end plate are brought into contact with each other, both rising portions are constrained by the stepped portion of the correction ring. There is ensured, also after butt Ri by the pressure, with the formation of space at the top of the while maintaining the pressurized state by moving the straightening ring butted portion, the body, the end plate, integral correcting jig And a manufacturing apparatus that facilitates the joining operation of the butted portion.

  In addition, since the second invention employs a manufacturing method using the manufacturing apparatus as described above, it is unnecessary to temporarily fix the abutting portion of the body and the end plate, resulting in a reduction in processing time and cost. The joint quality at the butt portion is improved, the occurrence of stress concentration is reduced, and the fatigue strength is increased.

1 is a side view showing a can manufacturing apparatus according to Embodiment 1. FIG. FIG. 3 is a sketch diagram illustrating a correction jig according to the first embodiment. It is a figure which shows the state which attached the end plate to the correction jig | tool by Embodiment 1. FIG. It is a figure which shows the state which attached the end plate to the correction jig | tool by Embodiment 1. FIG. It is a figure which shows the state which attached the trunk | drum and endplate by Embodiment 1 to the correction jig | tool. It is a figure which shows the state which moved the correction ring by Embodiment 1, and the joining instrument by Embodiment 3. FIG. It is a figure which shows the state which attached the trunk | drum and the end plate to the correction jig | tool by Embodiment 2. FIG.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing a state in which a metal hot water storage tank of a hot water storage hot water heater, for example, is mounted on a can manufacturing apparatus 50 according to the first embodiment. The can body 40 includes a bowl-shaped end plate 2 on both sides of the cylindrical body 1. The inner diameter of the body 1 is φ300 to φ700 mm, the thickness used is 0.5 to 1 mm, and the length of the can 40 including the end plates 2 on both sides is about 500 to 2000 mm.
The can body 40 is supported on the base 10 via a body receiver 9 installed on the base 10, and the exterior of the end plate 2 disposed on both sides of the body 1 is shown in FIG. 2 as will be described later with reference to FIGS. A first correction jig 20a and a second correction jig 20b, which are correction jigs 20, are provided. The rotation drive unit 4 is connected to the motor 5 via the shaft 13a and the gear 6 on the base 10 and outside the first correction jig 20a. The rotation drive unit 4 is rotated by the rotation of the motor 5, and the can body 40 is rotated via the first correction jig 20a. Details of this will be described later.
The second correction jig 20b is provided with a rotary driven unit 7 via a shaft 13b. The rotary driven unit 7 is installed on the base 10 via a slide rail 8 and is also connected to the pressure unit 3. Has been. When the pressurizing unit 3 operates and outputs a pressurizing force, the rotary driven unit 7 moves from the left side to the right in FIG. 1 to pressurize the can body 40. The pressurizing unit 3 changes the pressurizing force. It has a function that can.

The configuration and operation of the first correction jig 20a connected to the rotation drive unit 4 and the second correction jig 20b connected to the pressure unit 3 will be described with reference to FIGS.
The orientation of the straightening jig 20 shown in FIG. 2 indicates the first straightening jig 20a of FIG. 1 described above for the convenience of the arrangement of the drawing. The configuration is the same as that of the first correction jig 20a except that the direction is different.
In FIG. 3, the first correction jig 20 a is installed outside the end plate 2, a bottom plate 25 that receives the bottom surface 2 d of the end plate 2, and a rear surface of the rising portion 2 a provided at the opening 2 e of the end plate 2. It has a correction ring 21 that contacts 2b. In this state, the end plate 2 is supported by the first correction jig 20a. The straightening ring 21 is provided with a stepped portion 21a provided in the inner diameter side horizontal axis direction. The stepped portion 21a has a taper that decreases in diameter in the horizontal axis direction from the bottom 21b and the end surface 21d of the straightening ring 21. 21c is formed, and the rear surface 2b of the raised portion of the end plate 2 is in contact with the bottom 21b. As shown in FIG. 2, the correction jig 20 is provided with three sets of lifting units 22 for moving the correction ring 21 in the radial direction and a guide unit 23 for horizontally moving the correction ring 21 away from the body 1. Yes.
The elevating unit 22 manually rotates the handle 26 as a drive source and moves the correction ring 21 via the timing belt 24, but a motor or an air cylinder may be used as the drive source. Since the bottom plate 25 shown in FIG. 3 receives the pressing force of the pressurizing unit 3, the surface in contact with the bottom surface 2d of the end plate 2 has a shape that matches the curved shape of the end plate 2 and has a sufficient size.

Next, the operation of the can manufacturing apparatus 50 will be described.
First, as shown in FIG. 4, the position of the correction ring 21 is adjusted to a position having a gap G of about 1 mm between the bottom surface 2 d of the end plate 2 and the bottom plate 25 of the correction jig 20. The raised portion 2a is set so as to come into full contact with the bottom portion 21b of the correction ring 21. Thereby, even if the dimensional accuracy of the bottom surface 2d of the end plate 2 and the bottom plate 25 of the correction jig 20 is not ensured, for example, the rising portion 1a of the body 1 and the rising portion 2a of the end plate 2 described later in FIG. Flatness of the joint, which is an important factor in joining by welding, is ensured.

Next, the body 1 is set on the body receiver 9 as shown in FIG. In this case, the gap G described above is operated by pressing the existing pressing unit 3 and pressurizing via the second correction jig 20b, and the gap G between the bottom plate 25 and the end plate 2 is eliminated and brought into contact therewith. At this time, pressurization is performed with a weak pressure of, for example, about 50 kgf, which is the first pressure, thereby preventing the rising portion 1a of the body 1 from being deformed. With this first applied pressure, the rising portions 1a provided at both ends of the body 1 move along the taper 21c of the correction ring 21, and the rising portion front surface 2c of the end plate 2 and the rising portion of the body 1 are moved. The front surface 1b is abutted. Even when the body 1 is inclined and inserted into the stepped portion 21a of the correction ring 21 during pressurization, the rising portion 2a of the end plate 2 is deformed because the end plate 2 is received by the rising portion 2a. In this way, the butted portion 12 of the rising portion front surface 2c of the end plate 2 and the rising portion front surface 1b of the body 1 is formed over the entire surface in a manner that the support accuracy of the body 1 is corrected by the first pressure and is naturally imitated. Is done.
Next, pressurization is performed so that the butting portions 12 become dense with each other with a second pressurizing force of the pressurizing unit 3, for example, about 200 kgf.

By pressurizing the pressure unit 3 in this way, the end plate 2 and the body 1 supported by the first and second correction jigs 20a and 20b, which are correction jigs 20, are integrated. As shown in FIG. 6, the guide unit 23 of the first and second correction jigs 20 a and 20 b is operated in this state so that the bottom 21 b of the stepped portion 21 a of the correction ring 21 is connected to the rear surface of the raised portion of the end plate 2. The correction ring 21 is moved in a direction away from 2b, that is, in a direction away from the body 1. Since the correction ring 21 is moved in the integrated pressure state, no change occurs in the contact state of the butt 12. As the straightening ring 21 moves, a space S as shown in FIG. For example, a TIG welding torch can be disposed in the space S, which is the joining tool 11 shown in FIG.
Moreover, since it is an integrated pressurization state, the trunk | drum 1, the end plate 2, and the 1st, 2nd correction jig | tool 20a, 20b can be rotated integrally by the rotational drive unit 4. FIG.

  As described above, the can manufacturing apparatus 50 according to the first embodiment abuts the rear surface 2b of the end portion 2 of the end plate 2 on the bottom portion 21b of the correction ring 21, and uses the correction portion 1a of the body 1 as the correction ring. The pressurizing unit 3 pressurizes with the first pressurizing force so as to follow the taper 21c of the 21, so that the misalignment of the butting portion 12 is reduced, and the rising portion 1a is restrained by the stepped portion 21a of the correction ring 21. Thus, the parallelism of both rising parts is ensured, and the rising part 2a of the end plate 2 and the rising part 1a of the body 1 can be closely butted by a second pressing force larger than the first pressing force. Thus, the temporary fixing of the abutting portion 12 is not required, and the correction ring 21 is further retracted, so that the space S can be generated in the upper portion of the abutting portion 12. Thus, as a device for manufacturing the can body by joining the end plate 2 and the body 1, the temporary fixing process of the butt portion 12 is not required, the process is omitted, the energy is saved, and the cost is reduced as a result. As a result, the joining quality is improved, the joining work is facilitated, and a reusable device suitable for mass production is obtained.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIG.
Instead of the rising portions 1a at both ends of the body 1 of the first embodiment described above, a rising portion 1a in which the upper portion of the rising portion 1a is extended to provide the eaves portion 1c as shown in FIG. Good. In this case, the stepped portion 21a of the straightening ring 21 has a U-shaped bottom portion 21e in cross section, and the eaves portion 21c is inserted at the bottom of the U-shaped bottom portion 21e. In such a configuration, when TIG welding is performed, the amount of penetration increases by providing the eaves portion 1c, and a more stable quality of the welded portion is obtained. In addition, the same operation as in the first embodiment is performed. Performs the same effect.

Embodiment 3 FIG.
The third embodiment relates to a can manufacturing method using the can manufacturing apparatus of the first or second embodiment described above. A method for manufacturing a can body will be described based on FIG. 1 shown in the first embodiment.
In FIG. 1, a can body 40 is a metal hot water storage tank using a ferritic stainless steel material for a hot water storage type hot water heater. After the body 1, the end plate 2, and the correction jig 20 are pressure-integrated by the manufacturing apparatus 50 described in the first embodiment, the rising portion 1 a of the body 1 and the butting portion 12 of the rising portion 2 a of the end plate 2 are combined. Are joined using the joining tool 11. FIG. 6 shows a state in which the TIG welding torch that is the joining tool 11 is arranged in the space S above the butt portion 12 described in the first embodiment. In this state, the rotation drive unit 4 of the manufacturing apparatus 50 is started, and the body 1 that is pressure-integrated, the end plate 2 provided at both ends of the body, and the respective correction jigs 20 are rotated. TIG welding is performed over the entire circumference. Since the hot water storage tank is manufactured by such a method, it is possible to prevent the occurrence of a gap in the butt portion 12 at the time of welding without the need for performing temporary fixing welding of the butt portion 12, and to reduce mistakes. It eliminates the need for an extra dedicated tool required for welding work, eliminates an extra process, and enables stable welding with improved heat input effect.
In addition, since a TIG welding torch can be placed in a sufficient space S, a hot water storage tank with high dimensional accuracy can be obtained. It is possible to manufacture a long-life hot water storage tank with improved durability without crevice corrosion and stress concentration.

  Although the case where the hot water storage tank is made of ferritic stainless steel has been described above, it may be austenitic stainless steel, or copper or a copper alloy. Further, in the case of copper or a copper alloy, brazing joining by a method of placing or inserting the butting portion 12 may be adopted as a joining method. In this case, the brazing material is preferably a hard brazing material such as silver brazing, but is not limited thereto. Further, a welding method such as MIG welding may be employed for joining copper and copper alloy.

1 fuselage, 1a riser, 1b front of riser, 2 end plate, 2a riser,
2b rear surface of the rising portion, 2c front surface of the rising portion, 2d bottom surface, 3 pressure unit,
4 Rotation drive unit, 11 Joining tool, 12 Butt part, 20 Jig for correction,
20a 1st correction jig, 20b 2nd correction jig, 21 correction ring,
21a stepped part, 21b bottom part, 21c taper, 40 can body,
50 Can body manufacturing equipment.

Claims (5)

A can manufacturing apparatus for manufacturing a can by joining a body and an end plate, wherein the can manufacturing apparatus supports the end plates disposed on both sides of the body, respectively . A jig , a second correction jig , a rotation drive unit disposed outside the first correction jig, and a pressure unit disposed outside the second correction jig. Has
At the bottom of the stepped portion provided in the inner diameter side horizontal axis direction of the straightening ring by the straightening ring provided in each of the first straightening jig and the second straightening jig, the end plate the rising portion rear surface of the opening contact, pressurized and raised portion front surface of the body at both ends by the pressure, the raised portion front and pressurized the body of the support accuracy each other of the opening of the end plate of the pressure unit The correction ring is moved by a guide unit included in each of the first correction jig and the second correction jig, and the bottom of the stepped portion is opened in the end plate. after forming a space in an upper portion of the butt portion is disengaged from the raised portion rear parts, the body by the rotation driving unit, said end plate, said first correcting jig, the second correcting jig Rotate integrally Can body manufacturing apparatus characterized by. The pressurizing unit inserts rising portions at both ends of the fuselage with a first pressure along a taper that decreases in diameter in a horizontal axis direction from an end surface of the stepped portion of the correction ring, The front surface of the front part is abutted with the front surface of the rising part of the opening of the end plate and is acclimated, and then pressed against each other by a second applied pressure larger than the first applied pressure. The manufacturing apparatus of a can body as described. And the body by the rotation driving unit, and the end plate provided at both ends of the barrel body, said supporting the end plate first correcting jig is rotated integrally with said second correcting jig in state, using the manufacturing apparatus according to claim 1 you, characterized in that joining the butt portion of the rising portion of the opening portion of the pressurized abutted said end plate and the upstanding portion of the body Manufacturing method of can body. The body and the material of the end plate is stainless material, and production method of the can body according to claim 3, wherein the junction is characterized in that performed by TIG welding method. The body and the material of the end plate is copper or a copper alloy material, and production method of the can body according to claim 3, wherein the junction is characterized by performing the brazing method using a hard brazing material.

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