JP7565776B2 - Can body manufacturing apparatus and method for manufacturing can body - Google Patents

Description

This disclosure relates to a can body manufacturing apparatus and a can body manufacturing method.

A storage-type water heater, which has become widespread in recent years, is equipped with a large-capacity metal storage tank for storing heated water. The storage tank generally includes a body and a head plate welded (circumferentially welded) to both ends of the body. The body is a cylindrical member. The head plate is a bowl-shaped member. For the circumferential welding between the body and the head plate, welding methods have been considered from the viewpoint of joints of various shapes and can body manufacturing equipment. In order to extend the life of the can body, it is desirable to weld a so-called butt joint in which no gap is provided between the body and the head plate. In general, in butt welding of thin plates, it is necessary to strictly control the gap between the joints and the displacement in the plate thickness direction. The displacement mentioned above refers to the misalignment between the body and the head plate, that is, the displacement in the thickness direction of the two plates (the body plate and the head plate). For example, JP 8-224693 A (Patent Document 1) describes a circumferential welding device (can body manufacturing device) that sandwiches the body between a first member and a second member.

Japanese Patent Application Publication No. 8-224693

However, in the can body manufacturing apparatus (circumferential welding apparatus) described in the above document, the distortion of the opening shape of the end of the body cannot be sufficiently corrected by simply clamping the body (body portion) with multiple gripping parts (first member and second member). For this reason, when clamping the body with multiple gripping parts, it is necessary to attach a screwing means for screwing the multiple gripping parts together and a biasing means for biasing the multiple gripping parts together. In addition, before welding, the screwing means and the biasing means must be removed. In other words, an additional jig must be used. Therefore, in the can body manufacturing apparatus described in the above document, the work time increases when trying to correct the distortion of the opening shape of the body.

This disclosure has been made in consideration of the above problems, and its purpose is to provide a can body manufacturing device and a can body manufacturing method that can sufficiently correct distortion in the opening shape of the body and prevent an increase in working time.

The can body manufacturing apparatus of the present disclosure is a can body manufacturing apparatus for manufacturing a can body. The can body includes a body and a first head plate. The body has a first semi-cylindrical portion and a second semi-cylindrical portion. The second semi-cylindrical portion faces the first semi-cylindrical portion. The first head plate is joined to the body. The can body manufacturing apparatus includes a gripping portion and a first straightening tool. The gripping portion has a semicircular shape that conforms to the first semi-cylindrical portion of the body. The first straightening tool can insert the body and the first head plate. The first straightening tool can hold the first head plate. The inner periphery of the first straightening tool has a shape that conforms to the second semi-cylindrical portion of the body. The gripping portion is configured to grip the body by suctioning the first semi-cylindrical portion of the body. The gripping portion is configured to butt the body against the first head plate with the second semi-cylindrical portion in contact with the inner periphery of the first straightening tool.

According to the can body manufacturing apparatus of the present disclosure, the gripping portion is configured to grip the body by suctioning the first semi-cylindrical portion of the body. This makes it possible to correct the distortion of the opening shape of the first semi-cylindrical portion. The gripping portion is also configured to butt the body against the first end plate with the second semi-cylindrical portion in contact with the inner circumference of the first correction jig. This makes it possible to correct the distortion of the opening shape of the second semi-cylindrical portion. This makes it possible to sufficiently correct the distortion of the opening shape of the body. The gripping portion is also configured to grip the body by suctioning the first semi-cylindrical portion of the body. This makes it possible to avoid the need for an additional jig for fixing the multiple gripping portions together. This makes it possible to suppress an increase in work time.

1 is a side view showing a schematic configuration of a can body manufacturing apparatus according to a first embodiment; FIG. 2 is an end view taken along line II-II in FIG. 4 is an end view showing a schematic view of the can body manufacturing apparatus according to the first embodiment gripping a can body. FIG. A side view showing, in outline, the state in which the body of a can body is supported on the support portion of the can body manufacturing apparatus of embodiment 1, the first end plate is held by the first correcting jig, and the second end plate is held by the second correcting jig. A cross-sectional view showing, in outline, the state in which the body of a can body is supported on the support portion of the can body manufacturing apparatus of embodiment 1, the first end plate is held by the first correcting jig, and the second end plate is held by the second correcting jig. 4 is a cross-sectional view showing a state in which a body of a can body is inserted into a first correcting tool and a second correcting tool of the can body manufacturing apparatus according to the first embodiment. FIG. 1 is a cross-sectional view illustrating a state in which a first correcting tool and a second correcting tool of the can body manufacturing apparatus according to embodiment 1 have been moved away from a body of the can body. FIG. FIG. 2 is a perspective view showing a schematic configuration of a first correcting jig of the can body manufacturing apparatus according to the first embodiment. FIG. 4 is a perspective view showing a schematic configuration of a second correcting tool of the can body manufacturing apparatus according to the first embodiment. 2 is a cross-sectional view showing a schematic configuration of a welding machine of the can body manufacturing apparatus according to the first embodiment disposed above the can body. FIG. FIG. 3 is an enlarged view of region XI in FIG. 2 . 6 is an enlarged view showing a schematic configuration of the gripper of the can body manufacturing apparatus according to the first embodiment; FIG. 4 is a flowchart illustrating a schematic configuration of a can body manufacturing method according to the first embodiment. 1 is an end view showing a state in which a gripping portion of a can body manufacturing apparatus according to a first embodiment is about to grip a warped body of a can body. FIG. 1 is an end view showing a state in which a gripping portion of the can body manufacturing apparatus according to embodiment 1 grips the body of a can body to thereby straighten the body. FIG. FIG. 11 is a side view illustrating a schematic configuration of a can body manufacturing apparatus according to a second embodiment. 17 is an end view taken along line XVII-XVII in FIG. 16. FIG. 11 is a cross-sectional view showing a schematic configuration of a can body manufacturing apparatus according to a second embodiment.

The following describes the embodiment with reference to the drawings. Note that, in the following, the same or corresponding parts are given the same reference numerals, and redundant explanations will not be repeated.

Embodiment 1.
The configuration of a can body manufacturing apparatus 100 according to the first embodiment will be described with reference to Figures 1 to 12. As shown in Figure 1, the can body manufacturing apparatus 100 is a can body manufacturing apparatus 100 for manufacturing a can body V.

The can body V includes a body B, a first head plate H1, and a second head plate H2. The first head plate H1 is joined to the body B. The second head plate H2 is arranged so as to sandwich the body B between the first head plate H1 and the second head plate H2. The body B has a first semi-cylindrical portion B1 and a second semi-cylindrical portion B2. Each of the first semi-cylindrical portion B1 and the second semi-cylindrical portion B2 is semi-cylindrical. The first semi-cylindrical portion B1 and the second semi-cylindrical portion B2 integrally form a cylindrical shape. The second semi-cylindrical portion B2 faces the first semi-cylindrical portion B1. In this embodiment, the first semi-cylindrical portion B1 is arranged above the second semi-cylindrical portion B2. In FIG. 1, the outer shapes of the first head plate H1 and the second head plate H2 are indicated by dashed lines. The boundary between the first semi-cylindrical portion B1 and the second semi-cylindrical portion B2 is indicated by a two-dot chain line.

The can body V is used, for example, in a metal hot water tank of a hot water heater. The outer diameter of the body B, the first head plate H1, and the second head plate H2 is, for example, 300 mm or more and 700 mm or less. The material of the can body V is, for example, a ferritic stainless steel material. The plate thickness of the can body V is, for example, 0.5 mm or more and 1.5 mm or less. The total length of the can body V in the direction in which the first head plate H1 and the second head plate H2 sandwich the can body V is, for example, 500 mm or more and 2000 mm or less.

In this embodiment, the first direction DR1 is the direction in which the first mirror plate H1 and the second mirror plate H2 sandwich the fuselage B. The second direction DR2 is the direction of gravity. The third direction DR3 is a direction perpendicular to the first direction DR1 and the second direction DR2.

The can body manufacturing apparatus 100 includes a gripping unit 3, a first straightening tool 51, and a second straightening tool 52. In this embodiment, the can body manufacturing apparatus 100 further includes a base unit 1, a support unit 2, a holding unit 4, a pressure unit 6, a rotation drive unit 71, a first shaft 72, a gear 73, a motor 74, a rotation follower unit 75, a slide rail 76, a second shaft 77, a welding machine 8, and a control unit CU.

The base portion 1 is provided with a support portion 2, a holding unit 4, a pressure unit 6, a rotation drive portion 71, and a slide rail 76.

The support portion 2 is configured to support the can body V. Specifically, the support portion 2 is configured to support the second semi-cylindrical portion B2 of the body B. In this embodiment, the support portion 2 includes a first support portion 21 and a second support portion 22. The first support portion 21 and the second support portion 22 are arranged at an interval along the first direction DR1.

The gripping portion 3 is configured to grip the can body V supported by the support portion 2. Specifically, the gripping portion 3 is configured to grip the first semi-cylindrical portion B1 of the body B supported by the support portion 2. In this embodiment, the gripping portion 3 includes a first gripping portion 31 and a second gripping portion 32. The first gripping portion 31 and the second gripping portion 32 are arranged along the longitudinal direction (first direction DR1) of the body B. The first gripping portion 31 is configured to grip the body B on the first mirror plate H1 side of the center of the body B along the first direction DR1. The second gripping portion 32 is configured to grip the body B on the second mirror plate H2 side of the center of the body B along the first direction DR1.

As shown in Figures 2 and 3, the gripping unit 3 is configured to grip the body B by suctioning the first semi-cylindrical portion B1 of the body B. In this embodiment, the gripping unit 3 is configured to grip the body B by suctioning the first semi-cylindrical portion B1 of the body B from above along the second direction DR2.

The gripping portion 3 may adsorb the first semi-cylindrical portion B1 by vacuum suction using a plurality of vacuum pads as described below, or may adsorb the first semi-cylindrical portion B1 by the electromagnetic force of a plurality of electromagnets. The configuration by which the gripping portion 3 adsorbs the first semi-cylindrical portion B1 is not limited to these and may be determined as appropriate. Furthermore, the direction in which the gripping portion 3 adsorbs the first semi-cylindrical portion B1 of the body B is not limited to the upward direction along the second direction DR2 and may be determined as appropriate.

The gripping portion 3 has a semicircular shape that follows the first semicylindrical portion B1 of the body B. The gripping portion 3 includes a semicircular portion 35. The semicircular portion 35 opens toward the body B. The semicircular portion 35 has a semicircular shape that follows the first semicylindrical portion B1 of the body B. The inner diameter (inner diameter) of the inner circumference of the semicircular portion 35 is equal to the outer diameter of the body B. In this embodiment, when the semicircular portion 35 is attached to the body B, the angle at which the semicircular portion 35 opens with respect to the center of the body B is 180 degrees.

The gripping portion 3 may include a first extension portion 36 and a second extension portion 37. Each of the first extension portion 36 and the second extension portion 37 is connected to both ends of the semicircular portion 35. The first extension portion 36 and the second extension portion 37 extend from both ends of the semicircular portion 35 along the second direction DR2. In this embodiment, the distance between the first extension portion 36 and the second extension portion 37 is equal to the body B.

The gripping portion 3 has a first end E1 and a second end E2. In this embodiment, the first end E1 and the second end E2 are configured so that the distance between the first end E1 and the second end E2 along the direction in which the first end E1 and the second end E2 sandwich the body B widens toward the tip. That is, the gripping portion 3 has a tapered shape. In this embodiment, the first end E1 is connected to the first extension portion 36. The second end E2 is connected to the second extension portion 37. The support portion 2 is provided with a V-shaped recess for supporting the body B. In a side view, the body B is supported by two points of the recess.

The gripping portion 3 is configured to move along the second direction DR2 by the holding unit 4. As shown in FIG. 4, the holding unit 4 includes two connection plates 41, two height position adjustment stages 42, two horizontal position adjustment stages 43, a height position drive unit 44, a horizontal position drive unit 45, a frame 46, and a connection portion 47.

The first gripping portion 31 and the second gripping portion 32 of the gripping unit 3 are each connected to two height position adjustment stages 42 by two connecting plates 41. The gripping unit 3 is configured to be detachable from the connecting plate 41. The gripping unit 3 is also configured to be replaceable. Therefore, the first gripping unit 3 connected to the connecting plate 41 can be replaced with a second gripping unit 3 having an inner diameter different from the inner diameter of the first gripping unit 3. This allows the can body manufacturing device 100 to handle a first body B that can be gripped by the first gripping unit 3 and a second body B that has an outer diameter different from the outer diameter of the first body B and can be gripped by the second gripping unit 3.

Each of the two height position adjustment stages 42 is connected to each of the two horizontal position adjustment stages 43. Each of the two horizontal position adjustment stages 43 is connected to a height position drive unit 44 by a connection portion 47. The height position drive unit 44 is configured to move each of the two horizontal position adjustment stages 43 along the second direction DR2 (height direction). The height position drive unit 44 is connected to a horizontal position drive unit 45. The horizontal position drive unit 45 is configured to move the height position drive unit 44 along the first direction DR1. The horizontal position drive unit 45 is connected to a frame 46. The frame 46 is fixed to the base unit 1. The frame 46 is configured, for example, in a gate shape.

The position of the gripper 3 is adjusted by moving the height position driver 44 and the horizontal position driver 45 along the second direction DR2 and the first direction DR1, respectively.

Each of the first gripping portion 31 and the second gripping portion 32 is configured to move by the height position drive unit 44 moving each of the two horizontal position adjustment stages 43 along the second direction DR2. The first gripping portion 31 and the second gripping portion 32 are configured to move along the first direction DR1 by the horizontal position drive unit 45 moving the height position drive unit 44 along the first direction DR1. The first gripping portion 31 and the second gripping portion 32 are configured to move toward or away from each other. Thereby, the positions of the first gripping portion 31 and the second gripping portion 32 of the gripping unit 3 can be freely adjusted along each of the first direction DR1 and the second direction DR2. In addition, the first gripping portion 31 and the second gripping portion 32 can move along the first direction DR1 and the second direction DR2, respectively, while maintaining the distance between the first gripping portion 31 and the second gripping portion 32 along the first direction DR1.

As shown in FIG. 5, the first semi-cylindrical portion B1 and the second semi-cylindrical portion B2 of the can body V include a tubular portion C0, a first connecting portion C11, a second connecting portion C12, a first large diameter portion C21, and a second large diameter portion C22. The tubular portion C0 has a cylindrical shape. The tubular portion C0 is connected to the first large diameter portion C21 by the first connecting portion C11. The tubular portion C0 is connected to the second large diameter portion C22 by the second connecting portion C12. The outer diameters of the first large diameter portion C21 and the second large diameter portion C22 are larger than that of the tubular portion C0.

The first end plate H1 includes a first standing portion H11, a first cylindrical portion H12, and a first cup portion H13. The first standing portion H11 is configured to rise from the first cylindrical portion H12. The outer diameter of the first standing portion H11 is larger than the outer diameter of the first cylindrical portion H12. The first cup portion H13 sandwiches the first cylindrical portion H12 between the first standing portion H11 and the first cup portion H13. The first cup portion H13 is configured as the tip of the can body V.

The second end plate H2 includes a second standing portion H21, a second cylindrical portion H22, and a second cup portion H23. The second standing portion H21 is configured to rise from the second cylindrical portion H22. The outer diameter of the second standing portion H21 is larger than the outer diameter of the second cylindrical portion H22. The second cup portion H23 sandwiches the second cylindrical portion H22 between the second standing portion H21 and the second cup portion H23. The second cup portion H23 is configured as the tip of the can body V.

The first and second straightening jigs 51 and 52 are arranged to sandwich the gripping portion 3 along the first direction DR1. In FIG. 5, the first bottom plate 511 and the first cup portion H13 of the first straightening jig 51, which will be described later, are arranged apart from each other. This makes it possible to prevent the first cup portion H13 from contacting the first bottom plate 511 before the first standing portion H11 and the first cylindrical portion H12 are sufficiently in contact with the first straightening ring 512. Therefore, the first standing portion H11 and the first cylindrical portion H12 can be sufficiently in contact with the first straightening ring 512. The distance S between the first bottom plate 511 and the first cup portion H13 is, for example, 1 mm or more and 2 mm or less. The second bottom plate 521 and the second cup portion H23 of the second straightening jig 52, which will be described later, are arranged apart from each other. The distance between the second bottom plate 521 and the second cup portion H23 is, for example, 1 mm or more and 2 mm or less.

As shown in Figures 5 and 6, the first straightening tool 51 and the second straightening tool 52 are movable along the first direction DR1. As a result, the first straightening tool 51 and the second straightening tool 52 are configured to move the first mirror plate H1 and the second mirror plate H2 so that the first mirror plate H1 and the second mirror plate H2 sandwich the body B.

The first straightening tool 51 and the second straightening tool 52 are configured to pressurize the can body V by clamping the can body V with the first head plate H1 and the second head plate H2 in contact with the body B. The first straightening tool 51 and the second straightening tool 52 are configured to be switchable between a state in which the can body V is pressurized with a first pressure force and a state in which the can body V is pressurized with a second pressure force. The first pressure force is, for example, 196 N or more and 294 N or less. The second pressure force is greater than the first pressure force. The second pressure force is, for example, 980 N.

The first straightening tool 51 is capable of inserting the body B and the first mirror plate H1. The first straightening tool 51 is capable of holding the first mirror plate H1. The first straightening tool 51 is capable of holding the first mirror plate H1 inserted into the first straightening tool 51. The detailed configuration of the first straightening tool 51 for holding the first mirror plate H1 will be described later.

The inner circumference of the first straightening tool 51 has a shape that follows the second semi-cylindrical portion B2 of the body B. In this embodiment, the inner circumference of the first straightening tool 51 is configured as the inner wall of a cylinder. The diameter (inner diameter) of the inner circumference of the first straightening tool 51 is equal to or greater than the outer diameter of the body B. In this embodiment, the diameter (inner diameter) of the inner circumference of the first straightening tool 51 is greater than the outer diameter of the body B.

The gripping portion 3 is configured to butt the body B against the first mirror plate H1 with the second semi-cylindrical portion B2 in contact with the inner circumference of the first straightening jig 51. The gripping portion 3 is configured to butt the body B against the first mirror plate H1 with the second semi-cylindrical portion B2 being straightened to fit along the inner circumference of the first straightening jig 51. With the second semi-cylindrical portion B2 in contact with the inner circumference of the first straightening jig 51, the first semi-cylindrical portion B1 is positioned away from the inner circumference of the first straightening jig 51.

The first straightening jig 51 has a first bottom plate 511, a first straightening ring 512, a first annular portion 513, a first peripheral wall portion 514, a first tapered portion 515, a first support plate 516, a first cylinder 517, a first guide 518, and a first compression spring 519.

The first bottom plate 511 is configured to receive the bottom surface of the first cup portion H13 of the first mirror plate H1. The first bottom plate 511 is configured to contact the first cup portion H13 at the contact surface of the first bottom plate 511. The contact surface has a shape that follows the shape of the first cup portion H13. The contact surface has a sufficient area for pressurizing the first cup portion H13. When the contact surfaces are in contact with the first cup portion H13, the first straightening tool 51 and the second straightening tool 52 approach each other, and the first mirror plate H1, the second mirror plate H2, and the body B are pressurized.

The first straightening ring 512 is configured so that the first cylindrical portion H12 and the first cup portion H13 of the first mirror plate H1 can be inserted into it. The first straightening ring 512 is cylindrical. The first straightening ring 512 is configured to engage the first standing portion H11 of the first mirror plate H1. The first straightening ring 512 is configured to contact the back surface of the first standing portion H11 of the first mirror plate H1 and the side surface of the first cylindrical portion H12. Specifically, the first straightening ring 512 is configured so that the tip surface of the first straightening ring 512 contacts the back surface of the first standing portion H11 of the first mirror plate H1. The tip surface of the first straightening ring 512 is configured to sandwich the first standing portion H11 of the first mirror plate H1 between the first connecting portion C11 of the body B. The tip surface of the first straightening ring 512 is configured to be perpendicular to the longitudinal direction (first direction DR1) of the can body V. This improves the flatness of the first connection part C11 and the first standing part H11, which are the joints between the body B and the first end plate H1. In this embodiment, the flatness refers to the degree of alignment with a planar direction perpendicular to the longitudinal direction (first direction DR1) of the can body V. The higher the flatness, the closer the angle to the longitudinal direction (first direction DR1) of the can body V is to 90 degrees. The flatness of the first connection part C11 and the first standing part H11 is important for the joint between the body B and the first end plate H1. The first straightening ring 512 is configured so that the side of the first straightening ring 512 contacts the side of the first cylindrical part H12 of the first end plate H1. The central axis of the first straightening ring 512 coincides with the central axis of the can body V.

The first annular portion 513 surrounds the first straightening ring 512. The first annular portion 513 is configured not to come into contact with the tip of the first large diameter portion C21 when the body B is abutted against the first end plate H1.

The first peripheral wall portion 514 surrounds the first annular portion 513. The first peripheral wall portion 514 is cylindrical. The first peripheral wall portion 514 is connected to the first straightening ring 512 by the first annular portion 513. The inner diameter of the first peripheral wall portion 514 is larger than the first large diameter portion C21 of the body B. Therefore, the first peripheral wall portion 514 is configured so that the body B can be inserted.

The first tapered portion 515 is connected to the first peripheral wall portion 514 on the side opposite the first bottom plate 511 with respect to the first peripheral wall portion 514. The first tapered portion 515 is configured so that the inner diameter of the first tapered portion 515 increases from the base side toward the tip side of the first tapered portion 515. Therefore, the first large diameter portion C21 of the body B is easily inserted into the first tapered portion 515. The first tapered portion 515 is configured to guide the first large diameter portion C21 of the body B toward the first bottom plate 511.

The first straightening ring 512, the first annular portion 513, and the first peripheral wall portion 514 are connected to the first support plate 516. The first guide 518 and the first cylinder 517 are connected to the first support plate 516. The first straightening ring 512, the first annular portion 513, and the first peripheral wall portion 514, the first guide 518, and the first cylinder 517 sandwich the first support plate 516.

The first cylinder 517 is fixed to the first bottom plate 511. As shown in FIG. 7, the first cylinder 517 is configured to move the first support plate 516 along the first direction DR1. This allows the first straightening ring 512, the first annular portion 513, and the first circumferential wall portion 514 connected to the first support plate 516 to move along the first direction DR1. Specifically, the first cylinder 517 is configured to move the first support plate 516 away from the second straightening jig 52 along the first direction DR1. The first cylinder 517 can be controlled by a signal from the control unit CU (see FIG. 1). The first guide 518 is fixed to the first bottom plate 511.

The first compression spring 519 surrounds the first guide 518. The spring force of the first compression spring 519 applies a force to the first support plate 516 in a direction toward the body B. The position of the tip of the first compression spring 519 in the first direction DR1 is the same as the position of the tip of the first cylinder 517 in the first direction DR1 when it is not moving. As shown in FIG. 8, the first straightening jig 51 may include multiple first cylinders 517. Note that the first compression spring 519 is not shown in FIG. 8 for ease of explanation.

As shown in FIG. 6, the second corrective jig 52 is configured to support the second mirror plate H2 on the opposite side of the first corrective jig 51 with respect to the gripping portion 3. The second corrective jig 52 is arranged to face the first corrective jig 51. It is preferable that the second corrective jig 52 has the same configuration as the first corrective jig 51, except that the second corrective jig 52 is arranged to face the first corrective jig 51. The second corrective jig 52 is capable of holding the second mirror plate H2 inserted into the second corrective jig 52. The detailed configuration of the second corrective jig 52 for holding the second mirror plate H2 will be described later.

The inner circumference of the second straightening tool 52 has a shape that follows the second semi-cylindrical portion B2 of the body B. In this embodiment, the inner circumference of the second straightening tool 52 is configured as the inner wall of a cylinder. The diameter (inner diameter) of the inner circumference of the second straightening tool 52 is equal to or greater than the outer diameter of the body B. In this embodiment, the diameter (inner diameter) of the inner circumference of the second straightening tool 52 is greater than the outer diameter of the body B.

The gripping portion 3 is configured to butt the body B against the second mirror plate H2 with the second semi-cylindrical portion B2 in contact with the inner circumference of the second straightening jig 52. The gripping portion 3 is configured to butt the body B against the second mirror plate H2 with the second semi-cylindrical portion B2 being straightened to fit along the inner circumference of the second straightening jig 52. With the second semi-cylindrical portion B2 in contact with the inner circumference of the second straightening jig 52, the first semi-cylindrical portion B1 is positioned away from the inner circumference of the second straightening jig 52.

The second straightening jig 52 has a second bottom plate 521, a second straightening ring 522, a second annular portion 523, a second peripheral wall portion 524, a second tapered portion 525, a second support plate 526, a second cylinder 527, a second guide 528, and a second compression spring 529.

The second bottom plate 521 is configured to receive the bottom surface of the second cup portion H23 of the second mirror plate H2. The second bottom plate 521 is configured to contact the second cup portion H23 at the contact surface of the second bottom plate 521. The contact surface has a shape that follows the shape of the second cup portion H23. The contact surface has a sufficient area for pressurizing the second cup portion H23. When the first straightening tool 51 and the second straightening tool 52 approach each other with their contact surfaces in contact with the second cup portion H23, the first mirror plate H1, the second mirror plate H2, and the body B are pressurized.

The second straightening ring 522 is configured so that the second cylindrical portion H22 and the second cup portion H23 of the second mirror plate H2 can be inserted into it. The second straightening ring 522 is cylindrical. The second straightening ring 522 is configured to engage the second standing portion H21 of the second mirror plate H2. The second straightening ring 522 is configured to contact the back surface of the second standing portion H21 of the second mirror plate H2 and the side surface of the second cylindrical portion H22. Specifically, the second straightening ring 522 is configured so that the tip surface of the second straightening ring 522 contacts the back surface of the second standing portion H21 of the second mirror surface. The tip surface of the second straightening ring 522 is configured to sandwich the second standing portion H21 of the second mirror plate H2 with the second connection portion C12 of the body B. The tip surface of the second straightening ring 522 is configured to be perpendicular to the longitudinal direction (first direction DR1) of the can body V. This improves the flatness of the second connection part C12 and the second standing part H21, which are the joints between the body B and the second end plate H2. The flatness of the second connection part C12 and the second standing part H21 is important for the joint between the body B and the second end plate H2. The second straightening ring 522 is configured so that the side of the second straightening ring 522 contacts the side of the second cylindrical part H22 of the second end plate H2. The central axis of the second straightening ring 522 coincides with the central axis of the can body V.

The second annular portion 523 surrounds the second straightening ring 522. The second annular portion 523 is configured not to come into contact with the tip of the second large diameter portion C22 when the body B is abutted against the second end plate H2.

The second peripheral wall portion 524 surrounds the second annular portion 523. The second peripheral wall portion 524 is cylindrical. The second peripheral wall portion 524 is connected to the second straightening ring 522 by the second annular portion 523. The inner diameter of the second peripheral wall portion 524 is larger than the second large diameter portion C22 of the body B. Therefore, the second peripheral wall portion 524 is configured so that the body B can be inserted.

The second tapered portion 525 is connected to the second peripheral wall portion 524 on the side opposite the second bottom plate 521 with respect to the second peripheral wall portion 524. The second tapered portion 525 is configured so that the inner diameter of the second tapered portion 525 increases from the base side toward the tip side of the second tapered portion 525. Therefore, the second large diameter portion C22 of the body B is easily inserted into the second tapered portion 525. The second tapered portion 525 is configured to guide the second large diameter portion C22 of the body B toward the second bottom plate 521.

The second straightening ring 522, the second annular portion 523, and the second peripheral wall portion 524 are connected to the second support plate 526. The second guide 528 and the second cylinder 527 are connected to the second support plate 526. The second straightening ring 522, the second annular portion 523, and the second peripheral wall portion 524, the second guide 528, and the second cylinder 527 sandwich the second support plate 526.

The second cylinder 527 is fixed to the second bottom plate 521. As shown in FIG. 7, the second cylinder 527 is configured to move the second support plate 526 along the first direction DR1. This allows the second straightening ring 522, the second annular portion 523, and the second circumferential wall portion 524 connected to the second support plate 526 to move along the first direction DR1. Specifically, the second cylinder 527 is configured to move the second support plate 526 away from the second straightening jig 52 along the first direction DR1. The second cylinder 527 can be controlled by a signal from the control unit CU (see FIG. 1). The second guide 528 is fixed to the second bottom plate 521.

The second compression spring 529 surrounds the second guide 528. The spring force of the second compression spring 529 applies a force to the second support plate 526 in a direction toward the body B. The position of the tip of the second compression spring 529 in the first direction DR1 is the same as the position of the tip of the second cylinder 527 in the first direction DR1 when it is not moving. As shown in FIG. 9, the second straightening jig 52 may include multiple second cylinders 527. Note that the second compression spring 529 is not shown in FIG. 9 for ease of explanation.

1, 4 and 7, the pressurizing unit 6 is configured to move the second straightening tool 52 along the first direction DR1. The pressurizing unit 6 is configured to pressurize the can body V sandwiched between the first straightening tool 51 and the second straightening tool 52 by moving the second straightening tool 52 along the first direction DR1 toward the first straightening tool 51. The pressurizing unit 6 is connected to the second straightening tool 52 via a rotation follower 75 and a second shaft 77. The pressurizing unit 6 includes a drive mechanism such as a servo motor. The control unit CU is configured to control the pressurization by the pressurizing unit 6. Specifically, the control unit CU is configured to control the pressurization according to the load torque of the servo motor or the like and the position of the second straightening tool 52.

As shown in FIG. 1, the rotation drive unit 71 and the rotation follower unit 75 are arranged to sandwich the first corrective jig 51 and the second corrective jig 52. The rotation drive unit 71 is arranged on the opposite side of the first corrective jig 51 from the support unit 2. The rotation follower unit 75 is arranged on the opposite side of the second corrective jig 52 from the support unit 2.

The rotation drive unit 71 is connected to the first straightening jig 51 by a first shaft 72. The rotation drive unit 71 is connected to a motor 74 by a gear 73. The motor 74 is configured to rotate the rotation drive unit 71. The rotation of the rotation drive unit 71 is transmitted to the first straightening jig 51 by the first shaft 72, causing the first straightening jig 51 and the can body V to rotate.

The rotational driven part 75 is configured to rotate as the rotational drive part 71 rotates. It is desirable that the rotational drive part 71, the rotational driven part 75, and the can body V are arranged so that the rotational axis of the rotational drive part 71, the rotational axis of the rotational driven part 75, and the central axis of the can body V are arranged on the same straight line.

The rotational driven part 75 is connected to the second straightening tool 52 by the second shaft 77. The rotational driven part 75 is connected to the pressure unit 6.

As shown in FIG. 10, the welding machine 8 is configured to weld the first head plate H1 and the second head plate H2 to the fuselage B. The welding machine 8 is configured to weld the first head plate H1 and the second head plate H2 to the fuselage B, for example, by TIG (Tungsten Inert Gas) welding. The welding machine 8 is configured to weld the fuselage B and the first head plate H1 together when the first head plate H1 is exposed from the first straightening jig 51. The welding machine 8 is configured to weld the fuselage B and the second head plate H2 together when the second head plate H2 is exposed from the second straightening jig 52.

The welding torch 81 of the welding machine 8 is disposed above the first large diameter portion C21 and the second large diameter portion C22 of the body B. The welding machine 8 is configured to weld the first head plate H1 and the second head plate H2 around the entire circumference of the body B while the can body V is rotated by the rotary drive unit 71.

2, 3 and 11, in this embodiment, the gripping portion 3 is configured to grip the body B by vacuum suction with the plurality of vacuum pads 38. The plurality of vacuum pads 38 are embedded in the semicircular portion 35 along the circumferential direction of the semicircular portion 35. The plurality of vacuum pads 38 are arranged at intervals from each other. The tip of each of the plurality of vacuum pads 38 may be embedded inside the semicircular portion 35 or may protrude from the semicircular portion 35. When the tip of each of the plurality of vacuum pads 38 protrudes from the semicircular portion 35, the vacuum pads 38 are compressed radially outward from the semicircular portion 35. This causes the body B to deform along the semicircular portion 35. The inner wall surface IS of the semicircular portion 35 has a semicircular shape.

When the body B is magnetic, as shown in FIG. 12, the gripping portion 3 may be configured to grip the body B by the electromagnetic force of a plurality of electromagnets 39. Also, a plurality of vacuum pads 38 and a plurality of electromagnets 39 may be combined.

When multiple electromagnets 39 are used, the tip of each of the multiple electromagnets 39 may be embedded inside the semicircular portion 35, or may be embedded inside the semicircular portion 35. Preferably, the tip of each of the multiple electromagnets 39 is located 0.1 mm inside the inner circumference of the semicircular portion 35.

Next, the operation of the can body manufacturing apparatus 100 according to the first embodiment will be described with reference to Figures 1 to 15.

The can body manufacturing method is a method for manufacturing a can body V. As shown in FIG. 13, the can body manufacturing method includes a gripping step S101 and a step S102 in which the body B is butted against the first end plate H1.

In the gripping step S101 (see FIG. 13), as shown in FIG. 4, the first mirror plate H1 and the second mirror plate H2 are inserted into the first straightening tool 51 and the second straightening tool 52, respectively. The first mirror plate H1 is positioned so that the first bottom plate 511 and the first cup portion H13 are spaced apart, for example, by 1 mm. The first mirror plate H1 is also positioned so that the first upright portion H11 and the first cylindrical portion H12 are in contact with the first straightening ring 512 without any gaps. The second mirror plate H2 is positioned so that the second bottom plate 521 and the second cup portion H23 are spaced apart, for example, by 1 mm. The second mirror plate H2 is also positioned so that the second upright portion H21 and the second cylindrical portion H22 are in contact with the second straightening ring 522 without any gaps.

Next, the fuselage B is supported by the support portion 2. Specifically, the second semi-cylindrical portion B2 of the fuselage B is supported by the support portion 2. As shown in FIG. 14, the fuselage B supported by the support portion 2 is deflected by gravity. As a result, the fuselage B is deformed from a circular shape to an elliptical shape in a side view. The deformation of the fuselage B occurs because the fuselage B is made of a material having a thin plate thickness. The deformation of the fuselage B also occurs because the entire circumference of the fuselage B is not restrained. Note that in FIG. 14, the outer shape of the fuselage B in an undeformed state is shown by a two-dot chain line.

Next, as shown in FIG. 3, the gripper 3 approaches the fuselage B by descending from above the fuselage B supported by the support 2. The gripper 3 is moved by the height position drive unit 44 (see FIG. 1) of the holding unit 4. As shown in FIG. 14 and FIG. 15, the gripper 3 descends so that the first semi-cylindrical portion B1 of the deflected fuselage B is inserted between the first extension portion 36 and the second extension portion 37 of the gripper 3. As the fuselage B is inserted into the gripper 3, the deflection of the fuselage B is corrected. The descent of the gripper 3 stops at the position where the first semi-cylindrical portion B1 comes into contact with the semicircular portion 35.

Then, the first semi-cylindrical portion B1 is held by being sucked by the gripper 3. Specifically, as shown in FIG. 3, the vacuum pad 38 (see FIG. 11) of the gripper 3 sucks the first semi-cylindrical portion B1. The first semi-cylindrical portion B1 of the body B is corrected to fit along the semi-circular portion 35. That is, the first semi-cylindrical portion B1 of the body B is deformed to fit along the semi-circular portion 35. In addition, the height position of the gripper 3 is adjusted by the height position drive unit 44. That is, the gripper 3 is raised by the height position drive unit 44. As a result, the shape of the body B in a side view becomes closer to a circle due to the restraint by the support unit 2 supporting the second semi-cylindrical portion B2 of the body B and the restraint by the gripper 3 supporting the first semi-cylindrical portion B1 of the body B.

If the gripping unit 3 and the body B are misaligned, the position of the gripping unit 3 may be adjusted in advance using the height position adjustment stage 42 and the horizontal position adjustment stage 43. This allows the gripping unit 3 to accurately grip the body B.

Next, as shown in Figures 4 to 6, the body B is moved by the horizontal position drive unit 45 along the first direction DR1 toward the first straightening jig 51. As a result, the first connection portion C11 of the body B comes into contact with the first upright portion H11 of the first mirror plate H1 supported by the first straightening jig 51. Note that in this state, the second semi-cylindrical portion B2 is restrained only by two points of the support portion 2, and is therefore insufficient. For this reason, the second semi-cylindrical portion B2 may bend downward.

In the butting step S102, the body B is inserted into the first straightening tool 51, so that the body B is butted against the first head plate H1 with the second semi-cylindrical portion B2 of the body B in contact with the inner circumference of the first straightening tool 51. Specifically, when the body B is butted against the first head plate H1, the body B is inserted along the first tapered portion 515 of the first straightening tool 51. As a result, the second semi-cylindrical portion B2 is deformed to fit along the first peripheral wall portion 514, so that the shape of the second semi-cylindrical portion B2 becomes even closer to a circle. In addition, the first upright portion H11 and the first connecting portion C11 are in contact over the entire circumference.

Then, the pressure unit 6 is operated to move the second straightening jig 52 toward the body B along the first direction DR1. The second straightening jig 52 butts the second head plate H2 held by the second straightening jig 52 against the body B. When the body B butts against the second head plate H2, the body B is inserted along the second tapered portion 525 of the second straightening jig 52. As a result, the second semi-cylindrical portion B2 is deformed to fit along the second peripheral wall portion 524, so that the shape of the second semi-cylindrical portion B2 becomes even closer to a circle. In addition, the second standing portion H21 and the second connecting portion C12 are in contact over the entire circumference. In addition, the flatness between the first standing portion H11 and the first connecting portion C11 and the flatness between the second standing portion H21 and the second connecting portion C12 are improved. The improvement in flatness is important when joining is performed in a later process, for example, by welding.

Then, the gripper 3 stops suction. As shown in FIG. 4 and FIG. 10, the gripper 3 that has stopped suction is raised by the height position drive unit 44, and the gripper 3 is removed from the body B. The gripper 3 that has been removed from the body B is moved away from above the first and second straightening tools 51 and 52 by the horizontal position drive unit 45. This makes it possible to prevent the gripper 3 from interfering with the placement of the welding machine 8.

Next, the pressure unit 6 is activated. As a result, the first straightening tool 51 and the second straightening tool 52 pressurize the can body V by clamping the can body V with the first head plate H1 and the second head plate H2 in contact with the body B. The first straightening tool 51 and the second straightening tool 52 pressurize the can body V with a first pressure force. The first connection part C11 and the second connection part C12 of the body B are not deformed by the first pressure force. The pressure by the first straightening tool 51 and the second straightening tool 52 is measured and controlled by the control unit CU (see FIG. 1). If the pressure by the first straightening tool 51 and the second straightening tool 52 does not reach the first pressure force, there is a possibility that the butt joint is not properly performed. For this reason, the positions of the first straightening tool 51, the second straightening tool 52, and the body B are corrected by the operator before the next process is performed. In addition, before the next process, the assembly work of the first straightening jig 51, the second straightening jig 52, and the body B may be redone.

After it is confirmed that the first pressure is acting normally on the first head plate H1 and the second head plate H2, the first straightening ring 512 and the second straightening ring 522 move away from each other. That is, the first straightening ring 512 and the second straightening ring 522 move away from the body B. This creates a space above the first large diameter portion C21 and the second large diameter portion C22 in which the welding machine 8 can be placed. In this state, the can body V is pressurized by the first bottom plate 511 and the second bottom plate 521 with the first pressure, so the can body V, the first head plate H1, and the second head plate H2 do not deform.

The support part 2 also descends so as to separate from the body B. Note that, since the body B is pressurized by the first straightening tool 51 and the second straightening tool 52, the body B does not fall even when the support part 2 separates from the body B.

Then, the pressure unit 6 is activated. The first and second corrective tools 51 and 52 apply pressure to the can body V with a second pressure force. This causes the first connection part C11 and the first standing part H11 to come into close contact with each other. Also, the second connection part C12 and the second standing part H21 to come into close contact with each other. In other words, the joints of the can body V come into close contact with each other. Note that the second pressure force does not deform the can body V. The pressure force applied to the can body V increases while the can body V does not deform.

This completes the pressurization of the can body V.

Next, as shown in FIG. 10, the welding machine 8 moves above the pressurized can body V. The welding machine 8 welds the body B to the first head plate H1 and the second head plate H2. Specifically, the welding machine 8 welds the first large diameter portion C21 of the body B to the first head plate H1. The welding machine 8 also welds the second large diameter portion C22 of the body B to the second head plate H2. This completes the welding of the can body V.

Then, the gripper 3 moves above the body B. The height position driver 44 moves the gripper 3 down until it comes into contact with the body B. The gripper 3 grips the body B by suction. The body B is integrated with the first mirror plate H1 and the second mirror plate H2 by welding. Next, the second straightening tool 52 is retracted by the operation of the pressurizing unit 6 (not shown). The gripper 3 gripping the body B is transported above the support 2 by the height position driver 44 and the horizontal position driver 45. As the support 2 rises, the support 2 supports the body B transported above the support 2. The gripper 3 stops suctioning the body B. As a result, the can body V is removed from the gripper 3. The gripper 3 is moved away from above the support 2 by the height position driver 44 and the horizontal position driver 45.

This completes the manufacturing of the can body V.

Next, we will explain the effects of this embodiment.

According to the can body manufacturing apparatus 100 of this embodiment, as shown in FIG. 2 and FIG. 3, the gripping portion 3 is configured to grip the body B by suctioning the first semi-cylindrical portion B1 of the body B. The gripping portion 3 has a semicircular shape that conforms to the first semi-cylindrical portion B1 of the body B. Therefore, the first semi-cylindrical portion B1 comes into contact with the first straightening jig 51, thereby correcting the distortion of the opening shape of the first semi-cylindrical portion B1. The gripping portion 3 is configured to butt the body B against the first end plate H1 with the second semi-cylindrical portion B2 in contact with the inner circumference of the first straightening jig 51. As shown in FIG. 5, the inner circumference of the first straightening jig 51 has a shape that conforms to the second semi-cylindrical portion B2 of the body B. Therefore, the second semi-cylindrical portion B2 comes into contact with the first straightening jig 51, thereby correcting the distortion of the opening shape of the second semi-cylindrical portion B2. Therefore, the distortion of the opening shape of the body B can be sufficiently corrected.

As shown in FIG. 3, the gripping portion 3 is configured to grip the body B by adsorbing the first semi-cylindrical portion B1 of the body B. Therefore, the body B does not need to be gripped by being sandwiched between the multiple gripping portions 3. Furthermore, there is no need to use an additional jig to fix the multiple gripping portions 3. Therefore, an increase in work time can be suppressed.

As shown in FIG. 3, the first end E1 and the second end E2 are configured so that the distance between the first end E1 and the second end E2 along the direction in which the first end E1 and the second end E2 sandwich the body B widens toward the tip. This allows the body B of the can body V to be easily inserted between the first end E1 and the second end E2. This further reduces the increase in work time.

As shown in FIG. 10, the first straightening tool 51 and the second straightening tool 52 are configured to pressurize the can body V by clamping the can body V with the first head plate H1 and the second head plate H2 in contact with the body B. Therefore, the first head plate H1 and the second head plate H2 can hold the can body V away from the support portion 2 and the gripping portion 3. This makes it possible to prevent the support portion 2 and the gripping portion 3 from restricting the placement position of the welding machine 8. This makes it possible to prevent the welding conditions from being restricted.

As shown in FIG. 6, the first straightening tool 51 and the second straightening tool 52 are configured to pressurize the can body V by clamping the can body V with the first head plate H1 and the second head plate H2 in contact with the body B. Therefore, welding and other operations can be performed with the first head plate H1, the second head plate H2, and the body B integrated together. Therefore, there is no need to attach a jig to hold the body B or perform fixing operations such as screwing. Therefore, the labor of the process can be reduced and the work can be made more efficient. In addition, tools and equipment are not required to restrain the body B during welding. Therefore, the heat of welding is not dissipated from the body B to tools and equipment for restraining the body B. Therefore, it is possible to suppress the heat of the body B from dissipating from the body B, which would otherwise reduce the heat of the body B during welding. Therefore, the quality of the welding is improved.

As shown in FIG. 7, the first straightening tool 51 and the second straightening tool 52 are configured to be able to switch between a state in which the can body V is pressed with a first pressure force and a state in which the can body V is pressed with a second pressure force. The second pressure force is greater than the first pressure force. Therefore, after the can body V is pressed with the first pressure force, the can body V can be pressed with the second pressure force. If the fitting is not performed normally when pressing with the first pressure force, the first pressure force is weak, so that the position of the can body V can be corrected or the can body V can be reassembled without deforming the opening shape of the body B. Therefore, after confirming that the can body V is fitted with the first pressure force, the can body V can be pressurized with the second pressure force. Therefore, it is possible to achieve both reliable fitting and strong fitting of the can body V.

According to the manufacturing method of the can body according to the present embodiment, as shown in FIG. 2 and FIG. 3, the first semi-cylindrical portion B1 is held by being attracted to the holding portion 3. The holding portion 3 has a semicircular shape that conforms to the first semi-cylindrical portion B1 of the body B. Therefore, the first semi-cylindrical portion B1 comes into contact with the first straightening tool 51, thereby correcting the distortion of the opening shape of the first semi-cylindrical portion B1. As shown in FIG. 5, the body B is inserted into the first straightening tool 51, and the body B is butted against the first end plate H1 with the second semi-cylindrical portion B2 of the body B in contact with the inner circumference of the first straightening tool 51. The inner circumference of the first straightening tool 51 has a shape that conforms to the second semi-cylindrical portion B2 of the body B. Therefore, the second semi-cylindrical portion B2 comes into contact with the first straightening tool 51, thereby correcting the distortion of the opening shape of the second semi-cylindrical portion B2. Therefore, the distortion of the opening shape of the body B can be sufficiently corrected.

As shown in Figs. 2 and 3, the first semi-cylindrical portion B1 is held by being attracted to the holding portion 3. Therefore, the body B does not need to be held by being sandwiched between multiple holding portions 3. Furthermore, there is no need to use an additional jig to fix the multiple holding portions 3. Therefore, it is possible to suppress an increase in the working time.

Embodiment 2.
Next, the configuration of a can body manufacturing apparatus 100 according to embodiment 2 will be described with reference to Figures 16 to 18. Unless otherwise specified, embodiment 2 has the same configuration, manufacturing method, and effects as embodiment 1. Therefore, the same components as embodiment 1 above are given the same reference numerals, and the description will not be repeated.

As shown in FIG. 16, the can body manufacturing apparatus 100 according to this embodiment further includes a vibration unit 9. The vibration unit 9 is configured to vibrate the body B. In this embodiment, the can body manufacturing apparatus 100 includes four vibration units 9. The four vibration units 9 are arranged on both sides of the center of the body B along the first direction DR1. Also, as shown in FIG. 17, the four vibration units 9 are arranged to sandwich the body B along the third direction DR3.

As shown in FIG. 16, in this embodiment, the vibration unit 9 includes a suction pad 91, a vibration source 92, a first stage 93, and a second stage 94. The suction pad 91 is configured to be attached to the body B. The suction pad 91 is connected to a negative pressure generator (not shown), such as a vacuum ejector. When the negative pressure generator (not shown) is activated, the suction pad 91 is configured to be attached to the body B by vacuum suction. The vibration source 92 is connected to the suction pad 91. The vibration source 92 is, for example, a vibration motor or an air vibrator. The first stage 93 is movable along a first direction DR1. The second stage 94 is movable along a third direction DR3.

The vibration unit 9 is configured to move in synchronization with the movement of the horizontal drive unit of the holding unit 4. Therefore, even when the vibration unit 9 is fixed to the body B, it is possible to prevent the body B and the vibration unit 9 from becoming misaligned. This makes it possible to prevent the suction pad 91 from coming off the body B.

In addition, in Figures 16 and 17, the vibration unit 9 is placed on the side of the body B, but it may be placed anywhere as long as it is in contact with the body B.

Next, a method for manufacturing a can body according to the second embodiment will be described with reference to Figures 16 and 17. The differences from the first embodiment will be described.

First, as shown in Figs. 16 and 17, the gripping unit 3 grips the body B. Next, the suction pad 91 of the vibration unit 9 contacts the body B so as to sandwich the body B gripped by the gripping unit 3. The vibration source 92 of the vibration unit 9 vibrates the body B. The body B is slightly deformed by the vibration from the vibration source 92. The body B is butted against the first mirror plate H1 while being vibrated by the vibration unit 9. Specifically, the first standing portion H11 (see Fig. 6) is inserted into the first large diameter portion C21 (see Fig. 6). In this embodiment, the first standing portion H11 (see Fig. 6) is inserted into the first large diameter portion C21 (see Fig. 6) while the first large diameter portion C21 (see Fig. 6) is slightly deformed. The amount of movement of the gripper 3 and the vibrator 9 along the first direction DR1 is the same because the horizontal position driver 45 and the first stage 93 are synchronized. After the first upright portion H11 (see FIG. 6) is inserted into the first large diameter portion C21 (see FIG. 6), the vibration by the vibrator 9 stops.

Then, the vibration source 92 of the vibration unit 9 vibrates the body B. The body B is butted against the second mirror plate H2 while being vibrated by the vibration unit 9. Specifically, the second standing portion H21 (see FIG. 6) is inserted into the second large diameter portion C22 (see FIG. 6). After the second standing portion H21 (see FIG. 6) is inserted into the second large diameter portion C22 (see FIG. 6), the vibration by the vibration unit 9 stops.

Next, we will explain the effects of this embodiment.

According to the can body manufacturing apparatus 100 of this embodiment, as shown in FIG. 16, the vibration unit 9 is configured to vibrate the body B. This allows the body B to be slightly deformed when the first upright portion H11 of the first end plate H1 is inserted into the first large diameter portion C21 of the body B.

If there is variation in the diameter dimensions of the body B and the first mirror plate H1, as shown in Figure 18, the tip of the first large diameter portion C21 and the tip of the first standing portion H11 may come into contact, preventing the first standing portion H11 from being inserted into the first large diameter portion C21.

In contrast, in this embodiment, even if the first large diameter portion C21 and the first standing portion H11 come into contact, the body B is slightly deformed, allowing the first standing portion H11 to be inserted into the first large diameter portion C21. In addition, it is possible to prevent the tip of the first large diameter portion C21 from coming into contact with the tip of the first standing portion H11. Therefore, the first standing portion H11 can be easily inserted into the first large diameter portion C21. In other words, it is possible to reliably butt the body B and the first end plate H1. Similarly, it is possible to reliably butt the body B and the second end plate H2. This improves the productivity of the can body V production.

According to the can body manufacturing method of this embodiment, as shown in FIG. 16, the body B is butted against the first end plate H1 while being vibrated by the vibrating unit 9. This allows the body B to be butted against the first end plate H1 reliably. Similarly, the body B can be butted against the second end plate H2 reliably. This improves the productivity of the can body V manufacturing process.

The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

3 gripping portion, 51 first straightening tool, 52 second straightening tool, 100 can body manufacturing device, B body, B1 first semi-cylindrical portion, B2 second semi-cylindrical portion, E1 first end portion, E2 second end portion, H1 first head plate, H2 second head plate, V can body.

Claims (7)

A can body manufacturing apparatus for manufacturing a can body, the can body including a body having a first semi-cylindrical portion and a second semi-cylindrical portion facing the first semi-cylindrical portion, and a first end plate joined to a longitudinal end of the body,
A grip portion having a semicircular shape along the first semicylindrical portion of the body;
a first straightening tool into which the longitudinal end of the fuselage and the first head plate can be inserted and which can hold the first head plate;
The inner periphery of the first straightening jig has a shape that conforms to the second semi-cylindrical portion of the body,
a tip end portion of the first straightening jig facing a longitudinal end of the body has a first tapered portion such that an inner diameter of the inner periphery increases toward the tip end,
The gripping portion is configured to grip the body by adsorbing the first semi-cylindrical portion of the body, and is configured to butt the body against the first end plate with the longitudinal end of the body in contact with the inner circumference of the first straightening jig. The gripping portion has a first end and a second end arranged to sandwich the body along a radial direction of the body,
2. The can body manufacturing apparatus according to claim 1, wherein the first end and the second end are configured such that a distance between the first end and the second end along a direction in which the first end and the second end sandwich the body widens toward the tip. Further comprising a vibration part,
The can body manufacturing apparatus according to claim 1 or 2, wherein the vibration section is configured to vibrate the body. The can body further includes a second end plate arranged to sandwich the body between the first end plate,
Further, a second correcting tool configured to support the second end plate on the opposite side of the gripping portion from the first correcting tool,
The inner periphery of the second straightening tool has a shape that conforms to the second semi-cylindrical portion of the body, and a tip portion of the second straightening tool facing the other end of the body in the longitudinal direction has a second tapered portion such that an inner diameter of the inner periphery becomes larger as it approaches the tip,
The can body manufacturing apparatus according to any one of claims 1 to 3, wherein the first straightening jig and the second straightening jig are configured to pressurize the can body by clamping the can body with the first end plate and the second end plate contacting the longitudinal end and other end of the body on the inner circumference of the first straightening jig and the inner circumference of the second straightening jig. The first straightening tool and the second straightening tool are configured to be switchable between a state in which the can body is pressurized with a first pressing force and a state in which the can body is pressurized with a second pressing force,
The can body manufacturing apparatus according to claim 4 , wherein the second pressure force is greater than the first pressure force. A method for manufacturing a can body, the method including: a body having a first semi-cylindrical portion and a second semi-cylindrical portion facing the first semi-cylindrical portion; and a first end plate joined to a longitudinal end of the body, the method comprising:
a step of holding the first semi-cylindrical portion by being attracted to a holding portion having a semicircular shape along the first semi-cylindrical portion;
a step of using a first straightening tool that holds the first end plate of the can body , has an inner periphery that is shaped along the second semi-cylindrical portion, and has a first tapered portion whose tip portion facing the longitudinal end of the body has an inner diameter that increases as it approaches the tip , thereby inserting the longitudinal end of the body into the first tapered portion , so that the body is abutted against the first end plate with the longitudinal end of the body in contact with the inner periphery of the first straightening tool. The method for manufacturing a can body according to claim 6, in which the body is butted against the first end plate while being vibrated by a vibrating unit.

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