JP5638236B2 - Welded can - Google Patents

Description

  The present invention relates to a welded can body.

  As a metal can body that contains beverages, etc., a rectangular surface-treated steel sheet is rolled into a cylindrical shape, and both side edges are overlapped with each other and welded together to form a can body. A wound welded can is known. In such a welded can, in order to reduce costs, it has been studied to reduce the thickness of the surface-treated steel sheet as a raw material to 0.12 to 0.16 mm.

  By the way, in the above welded can body, after filling a can lid with one end of a can body (semi-finished product) filled with contents such as beverages, the other end is wrapped with a can lid and a filled can (finished product) However, in beverages such as coffee, retort sterilization (heat sterilization) may be performed after filling and sealing, in which case there is a difference in pressure inside and outside the welded can in the retort pot in the retort sterilization process. Arise. At this time, if the plate thickness of the surface-treated steel sheet is reduced, the paneling strength of the can body is lowered, and there is a possibility that the can body may be deformed due to a differential pressure inside and outside the welded can. There is a problem that the value of the product is lost if you do.

In order to solve this problem, it is conceivable to increase the strength while reducing the thickness of the surface-treated steel sheet. Its strength is shown by example yield stress Y _p.

  However, in the above-mentioned welded can body, when the strength of the surface-treated steel sheet is increased, when the surface-treated steel sheet is rolled for welding in the stage of forming the can body, the side edges are overlapped with each other within a range sufficient for welding. Tend to be difficult. In addition, even when welding can be performed, when a diameter-reduced portion is formed at both ends of the can body, and further when flange processing for tightening the can lid is performed on the diameter-reduced portion, the weld seam portion of the flange Cracks (flange cracks) may occur in the vicinity.

It is conceivable to increase the elongation (E _l ) of the surface-treated steel sheet in order to enable the welding and to prevent cracking due to the flange processing. However, when the elongation is increased, the strength of the surface-treated steel sheet becomes insufficient, and the paneling strength of the can body decreases, and the can body is caused by the pressure difference inside and outside the welded can in the retort sterilization process after filling the contents. It is reduced to the problem of dents.

  In order to solve this problem, a plurality of beads are provided in the central portion of the can body formed by welding the side edge portions of the surface-treated steel sheets having a thickness of 0.12 to 0.16 mm and overlapping each other. A welded can body has been proposed (see Patent Document 1).

  According to this welded can body, by providing a plurality of beads in the central portion of the can body, the required strength can be imparted to the can body even if the plate thickness of the surface-treated steel sheet is in the above range. The paneling strength is increased, and the dent of the can body can be prevented against the differential pressure inside and outside the welded can in the retort sterilization treatment step after filling the contents.

Japanese Patent No. 3665986

  However, in a welded can body in which a plurality of beads are provided in the center portion of the can body, there is a disadvantage in that a required display by printed characters, decoration by a pattern, and the like are limited due to the beads.

  The present invention eliminates such inconveniences and can reduce the thickness of the surface-treated steel sheet constituting the can body, and increase the paneling strength of the can body so that the can in the retort sterilization treatment step after filling the contents A welded can body that can prevent deformation of the dent of the can body against the pressure difference inside and outside the body, and has excellent stability without being restricted by the required display with printed characters and decoration with patterns. The purpose is to provide.

In order to achieve the above-described object, the present invention provides a can body formed by rounding rectangular surface-treated steel sheets into a cylindrical shape and overlapping both side edges of each other, and welding and joining at least one end of the can body. a welded can body having a seamed cans lid, said surface treated steel plate, and the plate thickness in the range of 0.12～0.16Mm, the yield stress _{Y p} in the range of 400～530MPa,. 5 to and a stretch E _l in the range of 30%, the can body has a cylindrical unprocessed portion having a diameter in the range of 51～53Mm, provided continuously on both sides of the yet-processed portion, said can ends two Both of the processed parts having flange portions to be tightly wound, the overall length of the can body is in the range of 96 to 106 mm, the length of the unprocessed part is in the range of 67 to 71 mm, The remainder obtained by subtracting the length of the unmachined part from the total length is taken as the sum of the lengths of the two machined parts. At least one of both processing portions, Ri surface processing portion der which irregularities are formed on the surface, the surface processed portion is made of the a raw portion and the surface portion of the same diameter, and recesses recessed from the surface portion It is characterized by that.

  The present invention relates to a welded can body formed by double-tightening a can lid on at least one end of a can body as described above, and relates to a welded can body having a size called a nominal diameter 202D. The can body of the welded can body having the nominal diameter 202D has a non-processed portion having a diameter in the range of 51 to 53 mm at the center thereof, and the processed portions are connected to both ends of the non-processed portion. In addition, the flange portion is formed at the opening end.

The surface treated steel sheet has a thickness in the range of 0.12～0.16Mm, the yield stress _{Y p} in the range of 400～530MPa, the elongation _{E l} in the range of 5-30%.

  When the thickness of the surface-treated steel sheet exceeds 0.16 mm, the effect of reducing the cost cannot be obtained. On the other hand, if the plate thickness of the surface-treated steel sheet is less than 0.12 mm, the paneling strength of the can body is too low, and the can body resists the pressure difference inside and outside the can in the retort sterilization process after filling the contents. Can not prevent dents.

Also, when the yield stress Y _p of the surface-treated steel sheet is more than 530MPa, the superimposable over the both side edge portions in a predetermined width by rounding a rectangular surface-treated steel plate (the can body blank) into a cylindrical shape for the weld Can not. On the other hand, when the yield stress Y _p of the surface-treated steel sheet is less than 400MPa is not obtained a sufficient buckling strength and paneling strength, indentation of the can body against the pressure difference outside the can body in the retorting process Can not be prevented.

Further, when the elongation E _l of the surface treated steel sheet exceeds 30%, the surface treated steel sheet becomes excessively soft, it is impossible to obtain a sufficient yield stress Y _p. On the other hand, when the elongation E _l of the surface treated steel sheet is less than 5%, the form of the diameter-reduction processing at both ends of the can body, when subjected to flanging to said reduced diameter processed portion, welding the flanging part It cannot be avoided that a crack occurs in the vicinity of the joint.

  Further, the welded can body has an overall length of the can body in a range of 96 to 106 mm, and includes an unprocessed portion having a length in a range of 67 to 71 mm between the processed portions. The remaining length obtained by subtracting the length of the unprocessed portion from the total length of the can body is the total length of both processed portions.

  The welded can body of the present invention contains a nominal 180-200 g beverage as the contents, and therefore, the total length of the can body needs to be in the range of 96-106 mm. If the total length of the can body is less than 96 mm, a nominal 180 g beverage cannot be accommodated. If the total length exceeds 106 mm, the volume (head space) in which the contents are not accommodated inside the welded can body becomes unnecessarily large.

  And the welding can body of this invention equips the can body center part with the unprocessed part of the length of the range of 67-71 mm with respect to the full length of the range of 96-106 mm of a can body, and makes the remainder into a process part. Thus, the paneling strength of the can body can be increased, and deformation of the dent of the can body can be prevented against the pressure difference inside and outside the can body in the retort sterilization treatment step.

  In addition, the welded can body of the present invention is provided with a non-processed portion having a length within the above range with respect to the entire length of the range of the can body, so that printed characters are printed on the non-processed portion without any limitation. It is possible to decorate with the required display and design.

Here, if both the processed parts provided continuously on both sides of the unprocessed part are reduced diameter processed parts having the same diameter and each is formed to have a predetermined length, there is a limit in design and a can lid A feeling of instability cannot be denied when the welded can body is made to stand on the ground. Therefore, in the welded can of the present invention, at least one of the two processed parts is a surface processed part having irregularities formed on the surface. The surface processed portion includes a surface portion having the same diameter as that of the unprocessed portion and a concave portion recessed from the surface portion. By doing in this way, the welded can of the present invention improves the design, and does not feel unstable when standing upright as described above, and can obtain an excellent sense of stability.

  Further, both of the processed parts provided continuously at both ends of the unprocessed part may be surface processed parts having irregularities formed on the surface.

  In the welded can of the present invention, one of the two processed parts of the can body is used as a surface processed part, and on the side opposite to the side where the surface processed part is provided, the unprocessed part is within a range of 45 to 51 mm. You may make it provide the diameter reduction process part which has a thin diameter.

  In addition, a tapered portion that reduces the diameter from the unprocessed portion toward the reduced diameter processed portion is formed at a portion where the reduced diameter processed portion is connected to the unprocessed portion, and is formed at the opening end of the reduced diameter processed portion. Is formed with a flange portion on which the can lid is double-tightened. Therefore, in this specification, the “length of the diameter-reduced portion” includes the length of the tapered portion and the length of the flange portion, and when the can lid is wound, the length of the tightened portion is also Shall be included.

  When one of the processed parts is the reduced diameter processed part, the reduced diameter processed part has a single diameter as a whole except for the tapered part and the flange part or the tightened part after the can lid is tightened. It may be a thing. The diameter-reduced portion may be reduced in a plurality of stages with respect to the diameter of the unprocessed portion, and the diameter of the most reduced portion may be in the range of 45 to 48 mm. The diameter-reduced portion can use a can lid with a smaller diameter than when it has the single diameter because the diameter of the most reduced portion is within the above range, further reducing costs. Can do.

  The surface-processed portion may be any surface with irregularities formed on the surface as long as it improves the paneling strength of the can body. For example, along the circumferential direction of the can body A plurality of formed bead portions may be provided.

  Examples of the surface-processed portion include those having irregularities formed on the surface by a plurality of concave portions provided along the circumferential direction of the can body. Specifically, the recess includes an inner wall continuously extending from the deepest part to the outer peripheral surface of the can body, and the inner wall is located at a boundary between the inner wall and the deepest part. A first curved surface that curves in the recess direction, and a second curved surface that curves in a direction opposite to the first curved surface and has a radius of curvature larger than that of the first curved surface and continues to the outer peripheral surface of the can body have.

  A welded can body including the surface-processed portion having a plurality of concave portions formed on the surface thereof is disclosed in Japanese Patent Application Laid-Open No. 2004-359347, Design Registration No. 990876, Design Registration No. 998557, Design Registration No. 1249016. No. 1, design registration No. 1249018, design registration No. 1285980, and design registration No. 1293477.

  Further, the surface processed portion may be formed with irregularities on the surface by a plurality of rectangular flat surfaces provided along the circumferential direction of the can body.

  Specifically, the plurality of rectangular flat surfaces are a plurality of first rectangular flat surfaces formed along the circumferential direction of the can body and the first rectangular shapes adjacent to each other along the circumferential direction. A first boundary ridgeline formed between the flat surfaces and the first rectangular shape along the circumferential direction and adjacent to the first rectangular flat surface in the axial direction of the can body with a predetermined interval A plurality of second rectangular flat surfaces formed at positions shifted from the flat surface, and a second boundary ridge line formed between the second rectangular flat surfaces adjacent in the circumferential direction. .

  The region between the first rectangular flat surface and the second rectangular flat surface has a pair of second boundaries adjacent to each other in the axial direction at the end of the first boundary ridge line and the first boundary ridge line. A pair of connecting ridge lines connecting the ends of the ridge lines are formed. Then, the first rectangular inclined surface that inclines toward the edge of the first rectangular flat surface from the pair of connection ridge lines adjacent to each other, and the second rectangular shape from the pair of connection ridge lines adjacent to each other. Triangular second inclined surfaces inclined toward the edge of the flat surface are alternately formed along the circumferential direction.

  A welding can body having a surface processed portion having a surface formed with irregularities by a plurality of rectangular flat surfaces is disclosed in Japanese Patent No. 40441173, Design Registration No. 1020526, Design Registration No. 1028526, Design Registration No. 1031504. Publication, design registration No. 1031504-1 publication, design registration No. 1031504-2 publication, and design registration No. 1031504-3 publication.

  For example, when the can of the present invention contains a nominal 180 g beverage as the contents, the can body has a total length in the range of 96 to 99 mm, and the total length of both processed parts is 25 to 25 mm. It is in the range of 32 mm.

  In addition, when the welded can body of the present invention accommodates a nominal 200 g beverage as the contents, for example, the can body has a total length in a range of 103 to 106 mm, and the lengths of both the processed parts in total. The length is in the range of 32-39 mm.

  Furthermore, the welded can of the present invention is an empty can formed by double-winding a can lid on the flanges at both ends of the can body, and the paneling strength of the can body is at least in the state of an empty can. It is characterized by 160 kPa.

  As the can lid used in the welded can body of the present invention, a metal double-winding can lid, which has been conventionally known, can be used. Specifically, such a can lid is a metal can lid formed of aluminum, tin-free steel, tin plate, or the like with a protective coating on the inner surface side of the can body. Preferably, in the case of a beverage can, after the contents are filled by double-tightening an aluminum steion tab-type can lid provided with an opening tab on the flange portion on one end side of the can body in the welded can body The can body is formed by double-winding a metal can lid having no opening tab on the flange portion on the other end side.

(A) is a cross-sectional view of a can body having flanges formed at both ends, (b) is a cross-sectional view of a welded can body in which a can lid is double-wrapped at one end of the can body (upper end in the figure), and (c) is a can The front view which shows the example of the welding can body which double-tightened the can lid to the both ends (upper and lower ends in the figure) of the trunk | drum, (d) is the DD sectional view taken on the line of (c). The graph which shows the relationship between the yield stress of a surface treatment steel plate, and the workability of a can body material. The graph which shows the relationship between the elongation of a surface treatment steel plate, and the workability of a can body material. The graph which shows the relationship between the length of an unprocessed part, and the intensity | strength of a can body. (A) is a front view which shows the structural example of the welding can of 2nd Embodiment, (b) is the BB sectional drawing of (a). The front view which shows the structural example of the welding can body of 3rd Embodiment. The front view which shows the structural example of the welding can body of 4th Embodiment.

  First, with reference to FIG. 1, the welding can body of 1st Embodiment of this invention is demonstrated.

  A welded can body 1a shown in FIG. 1B is formed by double-winding a can lid 3a around one end portion (the upper end portion in the figure) of the can body 2. As shown in (a), a rectangular surface-treated steel plate (can body blank) is rounded into a cylindrical shape, and both side edges are overlapped with each other and welded to each other (upper and lower ends in the figure). Includes a flange portion 2a for winding up the can lid.

  In the welded can of the present invention, as shown in FIG. 1 (b), a welded can 1a (semi-finished product before filling the contents) in which a can lid 3a is double-wrapped around a flange 2a at the upper end of the can body 2. In addition, as shown in FIGS. 1C and 1D, a welded can 1b in which can lids 3a and 3b are double-tightened on the upper and lower ends of the can body 2 is also included.

  The welded can 1b shown in FIGS. 1 (c) and 1 (d) is actually filled with contents such as beverages from the open end (lower end in the figure) into the welded can 1a of FIG. 1 (b). This is a form obtained by double-winding the can lid 3b around the open end. Alternatively, when measuring the paneling strength described later, the welded can 1 can be made into an empty can by double-tightening the can lids 3a and 3b around the upper and lower ends of the can body 2 without filling the contents. It is formed.

  The can body 2 shown in FIGS. 1A to 1D includes an unprocessed portion 4 constituting a central portion thereof, and a reduced diameter processed portion 5a formed at an upper end portion thereof and having a smaller diameter than the unprocessed portion 4. And a surface processed part 5b formed at the lower end part, and a welded seam part 6 by the welding joint is provided on the side surface.

  The reduced diameter processed portion 5a is connected to the unprocessed portion 4 via a taper portion 7 whose diameter decreases from the unprocessed portion 4 toward the reduced diameter processed portion 5a. The easy-to-open can lid 3a made of aluminum is double-rolled to the flange portions 2a at both ends of the can body 2 to form a tightening portion 8.

  The surface processed portion 5b includes a bead portion 9 formed along the circumferential direction of the can body 2 on the same diameter as the unprocessed portion 4, and the bead portion 9 is recessed from the surface into the can. Is formed. A reduced diameter processed portion 5c having a smaller diameter than the unprocessed portion 4 is formed at the end of the surface processed portion 5b, and the bottom lid can 3b is doubled in the reduced diameter processed portion 5c after filling the contents. A tightened winding portion 8 is formed.

  Although the welded cans 1a and 1b of the present embodiment show the case where the two bead portions 9 are provided, the number of the bead portions 9 can be appropriately selected within the range of 2 to 4. Moreover, the adjacent bead parts 9 and 9 may be formed at a predetermined interval from each other.

  The welded cans 1a and 1b of the present embodiment can obtain an excellent sense of stability by being self-supported with the surface processing portion 5b having a larger diameter down as compared with the diameter reducing processing portion 5a.

The surface-treated steel plate, tin-plated steel sheet, made of tin-free steel, etc., and the plate thickness in the range of 0.12～0.16Mm, the yield stress _{Y p} in the range of 400～530MPa, of 5-30% range and a growth E _l of. The surface-treated steel sheet is, for example, a steel sheet obtained by temper rolling after annealing a cold rolled steel sheet (hereinafter abbreviated as “SR material”) or a steel sheet obtained by secondary cold rolling after annealing a cold rolled steel sheet. (Hereinafter abbreviated as “DR material”) can be used.

  Further, the surface-treated steel sheet has a polyester film printed with characters, symbols, etc. printed on the outer surface side of the can through an adhesive layer. Moreover, the plain polyester film may be adhere | attached through the adhesive bond layer and the coating may be given to the can inner surface side of the said surface treatment steel plate.

  The welded cans 1a and 1b have a size called a nominal diameter 202D. In the can body 2 of the welded can body, the unprocessed portion 4 has a diameter in the range of 51 to 53 mm, for example, a diameter of 52.4 mm, and this diameter corresponds to the nominal diameter 202D. Further, the reduced diameter processed portion 5a has a diameter in the range of 46 to 51 mm, for example, a diameter of 50.0 mm, excluding the taper portion 7 and the tightening portion 8, and this diameter corresponds to a nominal diameter 200D. .

  In the nominal diameter, the hundredth digit indicates inches, and the tenth and first digit numbers indicate how many times 1/16 inch. Therefore, the nominal diameter 202D indicates that the diameter corresponds to (2 inches + 2/16 inches).

The welded can body of the present embodiment accommodates a nominal 180-200 g beverage as the contents. For this purpose, the total length of the can body 2 with respect to the diameters of the unprocessed portion 4 and the reduced diameter processed portion 5a. H is in the range of 96 to 106 mm. In addition, the welded cans 1 a and 1 b are not processed at all in the unprocessed portion 4, and have a length L ₁ in the range of 67 to 71 mm as the unprocessed portion 4. As a result, the remainder obtained by subtracting the length L ₁ of the unprocessed portion 4 from the total length H is the length L ₂ of the reduced diameter processing portion 5 a including the taper portion 7 and the tightening portion 8, and the tightening portion 8. has a total length _{L 3} of the surface processing portion 5b comprising a length _L 2, _{L 3} is appropriately adjusted to a combined becomes 25～39Mm.

As described above, the welded can body of the present embodiment has a length L ₁ in the range of 67 to 71 mm, with the central portion of the can body 2 as the unprocessed portion 4, so that characters printed on the polyester film There is no limitation on the design, and an excellent display can be performed and an excellent decoration effect can be obtained.

Next, a plurality of surface-treated steel plates each having a plate thickness of 0.15 mm and different in yield stress Y _p and elongation E ₁ were prepared as samples. The relationship between the workability and yield stress Y _p of the sample shown in FIG.

Here, the yield stress Y _p is a number in the circumferential direction when rounding the surface treated steel sheet for welded. In addition, the workability was subjected to a flanged state in which the side edge overlaps (roll foam suitability) when the surface-treated steel sheet is rolled for welding and a can lid is wound around the edge of the can body 2. Sometimes, the presence or absence of cracks in the vicinity of the weld seam 6 of the flange 2a is scored and evaluated comprehensively.

The roll form suitability was defined as 3 points where welding was possible due to the overlap of side edges, 1 point where welding was unstable, and 0 point where welding was impossible. The presence or absence of cracks was defined as 3 points where no cracks occurred, 1 point where there was a risk of cracks, and 0 points where cracks occurred. From Figure 2, surface-treated steel sheet wherein a sample is by yield stress Y _p is less than 530 MPa, it is clear that excellent processing can be obtained.

Next, the relationship between the workability and elongation E _l of the sample in FIG. Here, the elongation _El is a numerical value in the circumferential direction when the surface-treated steel sheet as the sample is rolled. Further, workability of the can body material constituting the can body 2 was evaluated in the exactly same manner as in the case of the yield stress Y _p. From FIG. 3, it is clear that the surface-treated steel sheet as the sample can obtain excellent workability when the elongation _El is 5% or more.

Then, among the samples, the plate thickness is 0.15 mm, the yield stress _{Y p} is 500 MPa, the surface treated steel sheet elongation _{E l} consists SR material is 20% of the unprocessed portion of the can body length _{L 1} A plurality of welded can bodies having different thicknesses were formed, and paneling strength was measured as a pressure when the can body was recessed by applying external pressure thereto. This paneling strength is obtained by creating a welded can body in an empty can state in which the can lid is double-wrapped at both ends of the can body and the contents are not filled, and put in a pressurized container for measurement. It can be obtained by measuring the pressure when pressure is applied from the outer surface of the can body and the can body is deformed. The length L ₁ of the unprocessed portion of the sample, Figure 4 shows the relationship between the paneling strength.

4, by the length _{L 1} of the unprocessed portion in the range of 67～71Mm, it is clear that it is possible to obtain the paneling strength of at least 160 kPa. In the present invention, it has been found that by setting the paneling strength to 160 kPa, decompression deformation due to cooling can be prevented when the retort treatment is actually performed after filling the contents.

  In fact, if the paneling strength is 160 kPa or more with an empty can with double-wrapped can lids at both ends of the can body, in the welded can body filled with contents, the can lid is double-rolled, The dent of the can body can be suppressed to a level that does not cause a problem in practice against the differential pressure inside and outside the can in the retort sterilization treatment process.

The welded can of this embodiment shall contain a nominal 180g drink as a content, for example. In this case, the can body 2 and the welded can body including the can body 2 have a total length in the range of 96 to 99 mm, the length L ₁ of the unprocessed portion 4 is in the range of 67 to 71 mm, and the diameter reduction processing portion 5a. the sum of the length _{L 3} of a length _{L 2} and the surface processing unit 5b is in the range of 25～32Mm.

Welding the can body containing beverage nominal 180g as contents, for example, overall length 96.93Mm, the length of the unprocessed portion _{L 1} is 70 mm, the length _{L 2} of the diameter reduction portion, wherein the sum of the length L ₃ of the surface processed portion is 26.9mm, which is substantially the same as the can body. The welding can body, by the length of the unprocessed portion L ₁ is 70 mm, without undergoing any limitation to the characters and symbols to be printed on the polyester film, it is possible to perform excellent display, excellent A decorative effect can be obtained.

  In addition, the paneling strength of the welded can body is 165 kPa or more, and it is clear that the can body can be prevented from being dented against the pressure difference inside and outside the can in the retort sterilization treatment step.

Moreover, the welding can body of this embodiment shall accommodate a nominal 200g drink as a content, for example. In this case, welding can body having a can body 2 and which has an overall length is in the range of 103～106Mm, the length _{L 1} of the unprocessed portion 4 is in the range of 67～71Mm, the diameter reduction portion 5a the sum of the length _{L 3} of a length _{L 2} and the surface processing unit 5b is in the range of 32～39Mm.

Welding the can body containing beverage nominal 200g as contents, for example, overall length of 104.13Mm, the length _{L 1} of the unprocessed portion is 70 mm, the length of the diameter reduction portion _{L 2} and the surface processing unit the sum of the length _{L 3} of a 34.1Mm, substantially the same as the can body. The welding can body, by the length of the unprocessed portion L ₁ is 70 mm, without undergoing any limitation to the characters and symbols to be printed on the polyester film, it is possible to perform excellent display, excellent A decorative effect can be obtained.

  Further, the paneling strength of the welded can 1 in the empty can state is 165 kPa, and it is clear that the can body can be prevented from being depressed against the pressure difference inside and outside the can in the retort sterilization treatment step.

  Next, a second embodiment of the present invention will be described.

  The welding can body 11 shown in FIGS. 5 (a) and 5 (b) is different from the welding can body 1b in FIGS. 1 (c) and 1 (d) with respect to the diameter of the unprocessed portion 4 instead of the reduced diameter processing portion 5a. It has the same configuration as the welded can 1b except that it includes a reduced diameter processed portion 5d formed in two stages.

  According to this welded can 11, the same operational effects as the welded can 1 can be achieved with respect to prevention of dents in the can body 2, decoration applied to the unprocessed portion 4, and a sense of stability when the body is made to stand on its own. Further, in the welded can 11, the diameter of the most reduced diameter portion of the reduced diameter processed portion 5 d is in the range of 45 to 48 mm, so that an easy open can lid 3 a having a smaller diameter can be used, and the cost is further reduced. Can be reduced.

  Next, a third embodiment of the present invention will be described.

  A welding can body 12 shown in FIG. 6 includes a plurality of recesses 13 provided along the circumferential direction in place of the bead portion 9 in the surface processed portion 5b in the welding can body 1b shown in FIGS. Except that a reduced diameter processed portion 5c having a smaller diameter than the unprocessed portion 4 is formed at the end opposite to the surface processed portion 5b with respect to the unprocessed portion 4 forming the central portion. It has the same configuration as the body 1b. And the welding can body 12 can have the same effect as the welding can body 1b.

  In this welded can 12, the recess 13 includes an inner wall that extends continuously from the deepest part to the outer peripheral surface of the can body. The inner side wall is located at a boundary between the inner side wall and the deepest portion, and is curved in a direction in which the concave portion is recessed, curved in a direction opposite to the first curved surface, and the first curved surface. And a second curved surface having a radius of curvature larger than that of the first curved surface and continuing to the outer peripheral surface of the can body.

  Moreover, each recessed part 13 is formed by shifting the position between the recessed parts 13 adjacent in the vertical direction. Specifically, the lower recess 13 is disposed below the pair of recesses 13 adjacent to each other in the upper circumferential direction.

  Japanese Unexamined Patent Application Publication No. 2004-359347 has a detailed description of the surface processed portion 5b including a plurality of concave portions 13 and a method for forming the surface processed portion 5b.

  Next, a fourth embodiment of the present invention will be described.

  A welding can body 14 shown in FIG. 7 has a plurality of rectangular shapes provided in the circumferential direction in place of the bead portion 9 in the surface processing portion 5b in the welding can body 1b shown in FIGS. Except having the flat surfaces 15 and 16, it has the same structure as the welding can body 1b. And the welding can body 14 can have the same effect as the welding can body 1b.

In this welded can 14, a plurality of rectangular flat surfaces 15 are formed along the circumferential direction of the can body 2, and a boundary ridge line 17 is provided between the adjacent rectangular flat surfaces 15 and 15. Rectangular flat surface 16, together with the adjacent at a predetermined interval in a rectangular shape flat surface 1 5 in the axial direction of the can body 2, offset rectangular flat surface 1 5 along the circumferential direction of the can body 2 A plurality of positions are formed, and a boundary ridge line 18 is provided between the adjacent rectangular flat surfaces 16 and 16.

  In a region between the rectangular flat surfaces 15 and 16, a pair of connecting ridge lines 19 connecting a lower end portion of the boundary ridge line 17 and an upper end portion of the pair of boundary ridge lines 18 and 18 adjacent to the boundary ridge line 17 in the axial direction. , 19 are formed. Then, a triangular inclined surface 20 that inclines toward the lower end edge of the rectangular flat surface 15 from a pair of adjacent connecting ridge lines 19, 19 and a rectangular flat surface from a pair of adjacent connecting ridge lines 19, 19 Triangular inclined surfaces 21 inclined toward the upper end edge of 17 are alternately formed along the circumferential direction.

  The surface processed part 5b including a plurality of rectangular flat surfaces 15 and 16 and a manufacturing method thereof are described in detail in Japanese Patent No. 4044173.

  Moreover, as long as the surface processing part 5b has the unevenness | corrugation formed in the surface, shapes other than the bead part 9, the recessed part 13, and the rectangular flat surfaces 15 and 16 may be formed.

1a, 1b, 11, 12, 14 ... welded can body, 2 ... can barrel, 2a ... flange part, 3a, 3b ... can lid, 4 ... unprocessed part, 5a ... reduced diameter processed part, 5b ... surface processed part, 9 ... bead, 13 ... recess, 15, 16 ... rectangular flat surface, L 1 _... unprocessed portion of the length, L 2 _... diameter reduction portion length of, L 3 _... surface treatment unit length of.

Claims (9)

A welded can body comprising a can body formed by rounding rectangular surface-treated steel plates into a cylindrical shape and welding side-by-side portions overlapped to each other, and a can lid double-rolled to at least one end of the can body Because
The surface treated steel sheet has a thickness in the range of 0.12～0.16Mm, the yield stress _{Y p} in the range of 400～530MPa, the elongation _{E l} in the range of 5-30%,
The can body has a cylindrical unprocessed portion having a diameter in a range of 51 to 53 mm, and both processed portions having flange portions that are continuously provided on both sides of the unprocessed portion and double-tighten the can lid. With
The overall length of the can body is in the range of 96 to 106 mm, the length of the unprocessed portion is in the range of 67 to 71 mm, and the remainder obtained by subtracting the length of the unprocessed portion from the overall length of the can body is The total length of both processed parts,
From the at least one of both processing portions, the surface processed portion der which irregularities are formed on the surface is, the surface processing unit, said a surface portion of the same diameter as the unprocessed portion, a recess which is recessed from the surface portion welded can body, characterized by comprising.   The welded can body according to claim 1, wherein the can body has a diameter that is narrower than the unprocessed portion in a range of 45 to 51 mm at an end portion of the can body opposite to the side on which the surface processed portion is provided. A welded can body characterized in that the parts are continuously provided.   3. The welded can body according to claim 2, wherein the diameter-reduced portion is reduced in a plurality of stages with respect to the diameter of the unprocessed portion, and the diameter of the most reduced portion is in a range of 45 to 48 mm. A welded can body characterized by being.   The welding can body according to any one of claims 1 to 3, wherein the surface processed portion includes a plurality of bead portions formed along a circumferential direction of the can body.   The welding can body according to any one of claims 1 to 3, wherein the surface-processed portion includes a plurality of concave portions formed along a circumferential direction of the can body. A welded can body comprising a can body formed by rounding rectangular surface-treated steel plates into a cylindrical shape and welding side-by-side portions overlapped to each other, and a can lid double-rolled to at least one end of the can body Because
The surface treated steel sheet has a thickness in the range of 0.12～0.16Mm, the yield stress _{Y p} in the range of 400～530MPa, the elongation _{E l} in the range of 5-30%,
The can body has a cylindrical unprocessed portion having a diameter in a range of 51 to 53 mm, and both processed portions having flange portions that are continuously provided on both sides of the unprocessed portion and double-tighten the can lid. With
The overall length of the can body is in the range of 96 to 106 mm, the length of the unprocessed portion is in the range of 67 to 71 mm, and the remainder obtained by subtracting the length of the unprocessed portion from the overall length of the can body is The total length of both processed parts,
At least one of the two processing unit is a surface-processed portion which irregularities are formed on the surface, the surface treatment unit is a rectangular flat surface of a plurality of formed along a circumferential direction first of the can body and A first boundary ridgeline formed between the first rectangular flat surfaces adjacent in the circumferential direction, and a predetermined interval between the first rectangular flat surfaces in the axial direction of the can body A plurality of second rectangular flat surfaces that are adjacent to each other and shifted from the first rectangular flat surface in the circumferential direction, and the second rectangular flat surfaces that are adjacent in the circumferential direction. The second boundary ridgeline formed between and the region between the first rectangular flat surface and the second rectangular flat surface, and the end of the first boundary ridgeline and the first boundary A pair of connected ridge lines connecting the ends of a pair of second boundary ridge lines adjacent to the ridge line in the axial direction, and a first rectangular shape from the pair of connected ridge lines adjacent to each other A triangular first inclined surface inclined toward the edge of the carrier surface, and a triangular second inclined from the pair of adjacent connecting ridge lines toward the edge of the second rectangular flat surface A welding can body comprising an inclined surface, wherein the first inclined surface and the second inclined surface are alternately formed along the circumferential direction.   The welded can body according to any one of claims 1 to 6, wherein the can body has a total length in a range of 96 to 99 mm, and a total length of both processed parts in a range of 25 to 32 mm. A welded can body characterized by that.   The welded can body according to any one of claims 1 to 6, wherein the can body has a total length in a range of 103 to 106 mm, and a total length of both processed parts is in a range of 32 to 39 mm. A welded can body characterized by that.   The welded can body according to any one of claims 1 to 8, wherein a paneling strength of the can body is in an empty can state formed by double-winding a can lid on flanges at both ends of the can body. A welded can body having a pressure of at least 160 kPa.

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