JP2014046353A - Manufacturing method of hollow container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a hollow container capable of improving watertightness and airtightness.SOLUTION: The manufacturing method of a hollow container comprises: a preparation step of preparing a first member 2 having a bottom part 11, a side wall part 12 provided in a standing manner on the bottom part 11, and a joint part 13 provided over the side wall part 12, and having a rectangular frame shape in a plan view, and preparing a second member 3 for closing an opening of the first member 2; and a friction pressure welding step of making the first member 2 and the second member 3 reciprocate relatively and linearly and performing friction pressure welding, while making the joint part 13 and the second member 3 come in planar contact with each other. The joint part 13 comprises: a pair of long side parts 13a; a pair of short side parts 13b; and four corner parts 13c connecting the long side parts 13a to the short side parts 13b; and at least one outer corner part of the four corner parts 13c is rounded off.

Description

  The present invention relates to a method for manufacturing a hollow container.

  For example, Patent Document 1 discloses a method of joining cylindrical metal members together by friction welding. In this joining method, both ends are joined by generating frictional heat on the joining surface by rotating at high speed around the central axis while pressing the end faces of the cylindrical metal member.

JP-A-8-215863

  On the other hand, when the abutting portion where the metal members abut each other has a rectangular frame shape in plan view, the metal members cannot be rotated and joined, so it is considered that the metal members are reciprocated linearly and joined. It is done. 11A and 11B are diagrams for explaining the problem. FIG. 11A is an exploded perspective view before joining, and FIG. 11B is a schematic plan view after joining. Here, a case where a hollow container is manufactured by joining a main body portion 101 having a rectangular shape in plan view and a lid portion 102 having a rectangular shape in plan view by friction welding is illustrated. The main body 101 includes a bottom 103 having a rectangular shape and a frame-like side wall 104 standing on the bottom 103. The wall thickness of the long side part and the short side part of the side wall part 104 is the same. The lid portion 102 is a plate-like member that covers the opening of the main body portion 101.

  When performing friction welding on such a rectangular member in plan view, after the upper surface of the side wall portion 104 and the lower surface of the lid portion 102 are abutted, for example, as shown in FIG. It can be considered that the main body portion 101 and the lid portion 102 are relatively reciprocated and joined in parallel to the extending direction of the long side portion of the side wall portion 104. However, when the friction welding is performed by the above-described method, there is a problem that the bonding at the corners becomes insufficient and the water tightness and the sealing performance of the hollow container are deteriorated.

  From such a viewpoint, an object of the present invention is to provide a method for manufacturing a hollow container capable of improving water tightness and air tightness.

  In order to solve such a problem, the present invention provides a first member including a bottom portion, a side wall portion standing on the bottom portion, and a joint portion having a rectangular frame shape in plan view formed on the upper side of the side wall portion, and Preparing a second member for closing the opening of the first member; and reciprocating the first member and the second member relatively and linearly while bringing the joint and the second member into surface contact. A friction welding step of moving and friction welding, wherein the joining portion includes a pair of long sides, a pair of short sides, and four corners connecting the long sides and the short sides. And at least one outer corner of the four corners is chamfered.

  According to such a method, since the outer corner portion of the corner portion of the joint portion is chamfered, the wall thickness of the corner portion becomes thinner than in the case where the corner portion is not chamfered. Thereby, when performing friction welding, since the fall of the pressure per unit area and friction heat which act on a corner | angular part can be suppressed, the bondability in a corner | angular part improves. Therefore, the watertightness and airtightness of the hollow container can be improved.

  Moreover, it is preferable that the outer corners of all the corners are chamfered. The outer corner is preferably rounded and chamfered. According to this configuration, the first member and the second member can be joined with a better balance.

  Moreover, it is preferable that (R / T1) × 100 ≧ 25 is satisfied, where R is the radius of curvature of chamfering and T1 is the wall thickness of the long side portion of the joint. According to this configuration, the pressure reduction rate can be reduced. That is, the water tightness and air tightness of the hollow container can be improved. On the other hand, if this condition cannot be satisfied, the pressure drop rate is increased, and the water tightness and air tightness are lowered.

  Further, it is preferable that T2> T1, where T1 is the wall thickness of the long side portion of the joint portion and T2 is the wall thickness of the short side portion of the joint portion. According to such a configuration, the water tightness and air tightness of the hollow container can be further improved.

  Preferably, the first member has a plurality of flow passage holes, and the second member has a header flow passage hole communicating with the plurality of flow passage holes. According to such a configuration, a hollow container provided with a channel hole and a header channel hole can be easily manufactured.

  According to the method for manufacturing a hollow container according to the present invention, it is possible to manufacture a hollow container having high watertightness and airtightness.

It is a disassembled perspective view of the hollow container which concerns on 1st embodiment of this invention. It is sectional drawing of the hollow container which concerns on 1st embodiment. It is II sectional drawing of FIG. It is a disassembled perspective view of the hollow container which concerns on 2nd embodiment of this invention. It is sectional drawing of the hollow container which concerns on 2nd embodiment. (A) is II-II sectional drawing of FIG. 5, (b) is an enlarged view of the A section of (a). It is a figure which shows the test piece which concerns on an Example, Comprising: (a) is a top view, (b) is III-III sectional drawing of (a). It is a table | surface which shows the joining conditions and test result of the test body which concerns on an Example. It is a table | surface which shows the joining conditions for every material of the 1st member which concerns on an Example, and the 2nd member. It is a graph which shows the relationship between R / T1 and a pressure fall rate. It is a figure for demonstrating a subject, Comprising: (a) is a disassembled perspective view before joining, (b) is a schematic plan view after joining.

[First embodiment]
The manufacturing method of the hollow container of embodiment of this invention is demonstrated in detail with reference to drawings. As shown in FIG. 1, the hollow container manufactured by the manufacturing method of the present embodiment is used as a heat transfer member by flowing a fluid therein, for example.

  As shown in FIG. 1, the hollow container 1 includes a first member 2 and a second member 3. The first member 2 and the second member 3 are both made of an aluminum alloy. The first member 2 and the second member 3 may be any material capable of friction welding, and may be other metal materials or resins. First, the structure of the 1st member 2 and the 2nd member 3 before joining is demonstrated. In the following description, the upper, lower, left and right, front and rear directions are based on the state of FIG. 1, but are for convenience and do not limit the direction of friction welding.

  As shown in FIG. 1, the first member 2 includes a bottom portion 11, a side wall portion 12 having a rectangular shape in plan view that is erected on the bottom portion 11, and a rectangular shape in plan view shape formed on the upper side of the side wall portion 12. It is mainly composed of the joint portion 13. A recess 14 is formed in the center of the first member 2.

  The side wall portion 12 includes long side portions 12a and 12a, short side portions 12b and 12b, and corner portions 12c, 12c, 12c, and 12c that connect the long side portion 12a and the short side portion 12b.

  The long side portions 12a and 12a have a plate shape and are arranged in parallel to each other. The short side portions 12b and 12b have a plate shape and are arranged in parallel to each other. The corner portion 12 c has a rectangular parallelepiped shape and is disposed at the four corners of the side wall portion 12. The corner portion 12c has the same height as the long side portion 12a and the short side portion 12b.

  The joining portion 13 is formed on the upper end surface of the side wall portion 12 and has a rectangular frame shape in plan view. The joint portion 13 includes long side portions 13a and 13a, short side portions 13b and 13b, and corner portions 13c, 13c, 13c, and 13c that connect the long side portion 13a and the short side portion 13b. What is necessary is just to set the height of the junction part 13c suitably according to the shift margin in a friction welding process.

  The long side portions 13a and 13a have a plate shape and are arranged in parallel to each other. The wall thickness of the long side part 13a and the wall thickness of the long side part 12a of the side wall part 12 are the same dimension. The short side portions 13b and 13b have a plate shape and are arranged in parallel to each other. The wall thickness of the short side part 13b and the wall thickness of the short side part 12b of the side wall part 12 are the same dimension.

  The corners 13 c have a plate shape and are arranged at the four corners of the joint 13. The corner 13c has the same height as the long side 13a and the short side 13b. A chamfered portion 13d is formed at the inner corner of the corner portion 13c, and a chamfered portion 13e is formed at the outer corner. Both the chamfered portion 13d and the chamfered portion 13e are round chamfered. The curvature radius of the chamfered portion 13e is larger than the curvature radius of the chamfered portion 13d.

  The second member 3 is a member equivalent to the first member 2. The second member 3 is a member that closes the opening of the recess 14 of the first member 2. Each part of the second member 3 is denoted by the same reference numeral as that of the first member 2, and detailed description thereof is omitted.

  As shown in FIG. 2, the abutting portion J <b> 1 is formed by abutting the first member 2 and the second member 3 together. When the upper surface (end surface) of the joint portion 13 of the first member 2 and the lower surface (opposing surface) of the joint portion 13 of the second member 3 are abutted, the shape of the abutting portion J1 is flat as shown in FIG. It becomes a rectangular frame shape. In the present embodiment, like the portion indicated by the hatch in FIG. 3, the shapes of the upper surfaces of the abutting portion J1 and the joint portion 13 are the same.

  As shown in FIG. 3, the wall thickness T2 of the short side portion 13b is longer than the wall thickness T1 of the long side portion 13a. The outer corner of the corner 13c is chamfered. Therefore, the wall thickness T3 of the corner 13c is shorter than the length T4 when not chamfered.

  Next, the manufacturing method of the hollow container which concerns on this embodiment is demonstrated. In the method for manufacturing a hollow container according to the present embodiment, a preparation process, a friction welding process, and a burr cutting process are performed.

  In the preparation step, the first member 2 and the second member 3 described above are prepared. The chamfered portions 13d and 13e of the first member 2 and the second member 3 may be chamfered on the shaped material, or the chamfered portions 13d and 13e may be formed in advance on the shaped material. .

  In the friction welding process, a friction process and a pressure welding process are performed. In the friction process, the first member 2 and the second member 3 are brought into surface contact with the upper surface (end surface) of the joint portion 13 of the first member 2 and the lower surface (opposing surface) of the joint portion 13 of the second member 3. Are pressed in directions close to each other. As shown in FIG. 3, the first member 2 and the second member 3 are reciprocated relative and linearly along a reference line C substantially parallel to the long side portion 13a. In the present embodiment, the first member 2 is not moved and only the second member 3 is linearly reciprocated.

  The conditions in the friction process may be set as appropriate, but the frequency is set to 100 to 260 Hz, the amplitude is set to 1.0 to 2.0 mm, and the friction pressure is set to 20 to 60 MPa. The time for the friction process is set to about 5 to 10 seconds. When the friction process is completed, the process immediately proceeds to the pressure contact process.

  In the pressure contact process, the first member 2 and the second member 3 are pressed in directions approaching each other without relatively moving. The conditions in the pressure contact process may be set as appropriate. For example, the upset pressure is set to 60 to 80 MPa, and the time is set to about 3 to 5 seconds.

  After frictional heat is generated in the abutting portion J1 by the friction process, when reciprocation is stopped and an upset pressure is applied to the joint portions 13 and 13 by the pressure welding process, an intermolecular attractive force acts on the abutting portion J1 and the first member 2 is joined. The upper surface of the portion 13 and the lower surface of the joint portion 13 of the second member 3 are coupled. In the friction process, the upper surface of the joint portion 13 of the first member 2 and the lower surface of the joint portion 13 of the second member 3 are rubbed together, and the softened base material is pushed out to generate burrs.

  In the burr cutting step, burrs generated on the outer surfaces of the side wall portions 12 and 12 are cut using a cutter device. The hollow container 1 is completed through the above steps.

  According to the manufacturing method of the hollow container demonstrated above, the corner | angular part 13c of the junction part 13 has the outer corner part chamfered. Therefore, the wall thickness T3 of the corner portion 13c is shorter than the length T4 when not chamfered. Thereby, the pressure per unit area and frictional heat which act on the corner | angular part 13c at the time of friction welding can be suppressed. Therefore, the water tightness and air tightness of the hollow container 1 can be enhanced.

  Further, according to the present embodiment, it is not necessary to increase the friction pressure in order to improve the bondability of the corner portion 13c, so that the generation of burrs can be reduced.

  In addition, since the chamfered portions 13e are formed at the four corner portions 13c as in the present embodiment, the bonding can be performed with a good balance. Further, by making the chamfered portion 13e rounded chamfered, it is possible to join with better balance.

  Further, when the curvature radius of the chamfered portion 13e is R and the wall thickness T1 of the long side portion 13a of the joint portion 13 is satisfied, it is preferable that (R / T1) × 100 ≧ 25 is satisfied.

  Moreover, it is preferable that the relationship between the wall thickness T1 of the long side part 13a of the junction part 13 and the wall thickness T2 of the short side part 13b is T2> T1. According to such a configuration, the pressure drop rate of the hollow container can be improved. If T2 ≦ T1, the thickness of the short side portion 13b in the reciprocating direction is reduced, and the frictional heat generated at the short side portion 13b is lower than that of the long side portion 13a. Thereby, the adhesion degree of the long side part 13a and the short side part 13b will become imbalanced. On the other hand, by setting T2> T1, the imbalance of the frictional heat generated in the long side portion 13a and the short side portion 13b can be corrected, and bonding can be performed in a balanced manner.

<Second embodiment>
FIG. 4 is an exploded perspective view of the hollow container according to the second embodiment. As shown in FIG. 4, the hollow container 1A according to the second embodiment includes a first member 2A and a second member 3A. The second embodiment is different from the first embodiment in that the side surfaces 42 and the joints 43 of the first member 2A have the same shape. Further, the hollow container 1A is different from the first embodiment in that a plurality of flow path holes 45 and header flow path holes 64 that connect the flow path holes 45 are formed.

  The first member 2 </ b> A includes a bottom 41, a rectangular frame-like side wall 42 erected on the bottom 41, a joint 43 formed on the top of the side wall 42, and the side wall 42 and the joint 43. And a plurality of partition portions 44 formed along the vertical direction. The inside of the first member 2 </ b> A is partitioned into a plurality of spaces by the partition portion 44. The space becomes a flow path 45 for circulating a fluid. In addition, in 2nd embodiment, since the plane cross section of the side wall part 42 and the junction part 43 becomes the same shape, detailed description about the side wall part 42 is abbreviate | omitted.

  The joint part 43 has a rectangular frame shape in plan view, and the long side parts 43a and 43a, the short side parts 43b and 43b, and the corner parts 43c, 43c, 43c, and 43c that connect the long side part 43a and the short side part 43b. It consists of and.

  The long side portions 43a and 43a have a plate shape and are arranged in parallel to each other. The short sides 43b and 43b have a plate shape and are arranged in parallel to each other.

  A chamfered portion 43d is formed at the inner corner of the corner portion 43c, and a chamfered portion 43e is formed at the outer corner. Both the chamfered portion 43d and the chamfered portion 43e are rounded chamfers. The curvature radius of the chamfered portion 43e is larger than the curvature radius of the chamfered portion 43d.

  As shown in FIG. 4, the second member 3 </ b> A includes a bottom portion 61, a side wall portion 62 having a rectangular frame shape in a plan view standing on the bottom portion 61, a joint portion 63 provided below the side wall portion 62, and a side wall And a header channel hole 64 formed inside the portion 62. The header flow path hole 64 is a part that connects one end side of the flow path hole 45 when the first member 2A and the second member 3A are joined. In the second embodiment, the side sections 62 and the joint sections 63 have the same planar cross section, and thus detailed description of the side walls 62 is omitted.

  The joint part 63 includes long side parts 63a and 63a, short side parts 63b and 63b, and corner parts 63c, 63c, 63c and 63c connecting the long side part 63a and the short side part 63b. A chamfer 63d is formed at the inner corner of each corner 63c, and a chamfer 63e is formed at the outer corner. The chamfered portions 63d and 63e are both rounded chamfers. The curvature radius of the chamfered portion 63e is larger than the curvature radius of the chamfered portion 63d.

  The lengths of the long side portions 43a and 63a and the wall thickness T1 have the same dimensions. The lengths of the short sides 43b and 63b and the wall thickness T2 are the same. Furthermore, the opposite corners 43c and 63c have the same shape.

  Next, the manufacturing method of the hollow container which concerns on 2nd embodiment is demonstrated. In the method for manufacturing a hollow container according to the present embodiment, a preparation process, a friction welding process, and a burr cutting process are performed.

  In the preparation step, a first member 2A and a second member 3A are prepared.

  In the friction welding process, a friction process and a pressure welding process are performed. The outer surfaces of the side walls 42 and 62 are flush with each other while the lower surface (opposing surface) of the joint 63 of the second member 3A is brought into surface contact with the upper surface (end surface) of the joint 43 of the first member 2A. A portion where the upper surface of the joint portion 43 of the first member 2A and the lower surface of the joint portion 63 of the second member 3A are in contact with each other is a “butting portion J2”. The abutting portion J2 has a rectangular frame shape in plan view. The planar shape of the abutting portion J2 is the same shape as the upper surface (end surface) of the joint portion 43, as shown by the hatched portion in FIG.

  In the friction process, the first member 2A and the second member 3A are pressed in a direction approaching each other, and as shown in FIG. 6, along the reference line C substantially parallel to the long side portion 43a, the first member 2A and the second member 3A are reciprocated relative and linearly.

  In the burr cutting step, burrs generated on the outer surfaces of the side walls 42 and 62 are cut using a cutter device. The hollow container 1A is completed through the above steps.

  According to the hollow container manufacturing method described above, the chamfered portion 43 e is formed at the outer corner portion of the corner portion 43 c of the joint portion 43. Therefore, the wall thickness T3 of the corner portion 43c is shorter than the length T4 when not chamfered. Thereby, the pressure per unit area which acts on the corner | angular part 43c at the time of friction welding, and the fall of friction heat can be suppressed. Therefore, the water tightness and air tightness of the hollow container 1 can be enhanced.

  Moreover, according to this embodiment, the hollow container 1A provided with the several flow-path hole 45 and the header flow-path hole 63 which connects the edge part of the several flow-path hole 45 can be manufactured easily.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in the present embodiment, the chamfered portion is provided on both the first member and the second member, but it is only necessary that the chamfered portion is formed on at least one of them. Moreover, in this embodiment, although the chamfered part was formed in all the four corners of a 1st member and a 2nd member, you may form a chamfered part in any one corner. In this embodiment, the chamfered portion is a round chamfer (R chamfer). However, a linear chamfer (C chamfer) such as 45 ° chamfer may be performed.

  Further, for example, the hollow container may be formed using the first member 2 and a metal plate that closes the opening of the first member 2 as a lid member. In this case, an abutting portion J1 having the same shape as the end surface of the joint portion 13 is formed by abutting the end surface of the joint portion 13 of the first member 2 with the lower surface (opposing surface) of the metal plate.

  Moreover, in this embodiment, although the burr cutting process was performed using the cutter apparatus, it may replace with a burr cutting process and may perform a welding process using the burr | flash formed in the outer surface as a filler material. By welding using burrs as a filler material, it is possible to remove the burrs and clean the outer surface, and if there are joint defects at the joints, the joint defects can be repaired in the welding process. .

  Next, examples of the present invention will be described. In Examples, as in the first embodiment described above, members having the same shape were joined to each other, and the pressure drop rate of the manufactured hollow container was measured.

  As shown in FIG. 7, test pieces were prepared in which the wall thickness T1 of the long side portion was set to 1.5 mm, 2.0 mm, and 2.5 mm. These three types of test pieces have the same dimensions in other portions except for the wall thickness T1.

  Further, as shown in FIG. 8, two types of materials for the first member, A1050 (JIS) and A6063 (JIS), were prepared, and two types of materials for the second member, ADC12 (JIS) and A6063, were prepared. Moreover, the curvature radius R of the test piece which does not provide a chamfer part in the first member and the second member (no chamfer), and the chamfer part of the first member and the second member is 0.5 mm, 2.0 mm, 4.0 mm, A test piece having a thickness of 6.0 mm was prepared.

  By appropriately combining these conditions, the test specimen NO. 1-27 was set and the 1st member and the 2nd member were joined by the method similar to 1st embodiment. The friction frequency in friction welding was set to 240 Hz. The joining conditions for each material of the first member and the second member are shown in FIG.

  JIS: A6063 used for the first member and the second member is Si; 0.20 to 0.60%, Fe; 0.35% or less, Cu; 0.10% or less, Mn; 0.10% or less, Mg 0.45 to 0.90%, Cr; 0.10% or less, Zn; 0.10% or less, Ti; 0.10% or less, Al; the balance.

  JIS: A1050 used for the first member is Si: 0.25% or less, Fe: 0.40% or less, Cu: 0.05% or less, Mn: 0.05% or less, Mg: 0.05% or less, Zn: 0.05% or less, V: 0.05% or less, Ti: 0.03% or less, Al: 99.50% or more.

  JIS: ADC12 used for the second member is Cu; 1.5 to 3.5%, Si; 9.6 to 12.0%, Mg; 0.3% or less, Zn; 1.0% or less, Fe; 1.3% or less, Mn: 0.5% or less, Ni: 0.5% or less, Ti: 0.3% or less, Pb: 0.2% or less, Sn: 0.2% or less, Al; It is configured.

  The pressure reduction rate means the pressure reduction rate from the stage where air is supplied from a hole formed in a part of the manufactured hollow container and the supply of air is shut off. In this example, a hole was made in a part of the hollow container, air was supplied from the hole at 500 kPa, and the time from when the supply of air was shut off until the internal pressure of the hollow container reached 100 kPa was measured. The measurement time was up to 60 seconds, and when the internal pressure did not reach 100 kPa even after exceeding 60 seconds, the internal pressure when 60 seconds elapsed was measured.

The pressure drop rate (kPa / sec) is expressed by the following formula 1.
Pressure drop rate = (P ₀ −P _min ) / t (Formula 1)
P ₀ : Initial pressure (500 kPa)
P _min : Minimum pressure t: Time from pressure supply shut-off until reaching the minimum pressure In short, the lower the pressure drop rate, the higher the water tightness and air tightness. Pressure drop rate: 1.0 kPa / sec is used as a threshold value for judgment regarding watertightness and good / bad airtightness.

  Specimen NO. When chamfered portions are not provided, such as 1, 6, 9, 14, 19, 22, 25, the pressure drop rate is significantly higher than when chamfered portions are provided, and watertightness and airtightness are reduced. I understand. It can be seen that when the radius of curvature R of the chamfered portion is 2.0 mm, 4.0 mm, and 6.0 mm, the pressure drop rate is lowered, and the water tightness and the air tightness are improved. In FIG. 8, as the radius of curvature R without chamfering, considering the shape after deburring at the actual outer corner of the test specimen, 0.1 mm of the degree of thread chamfering is substituted, and R / T1 is calculated. I'm calculating.

  Further, when the radius of curvature R of the chamfered portion is set to 0.5 mm, when the wall thickness T1 is set to 2.5 mm, the pressure drop rate becomes 1.0 kPa / sec or more, and the water tightness and the air tightness are lowered. It can be seen that when the thickness T1 is 1.5 mm and 2.0 mm, the pressure drop rate is low, and the watertightness and airtightness are good. Further, if the radius of curvature R of the chamfered portion is set to 1.0 mm or more, it is considered that generally good results can be obtained regardless of the wall thickness T1.

  FIG. 10 is a graph showing the relationship between R / T1 and the pressure drop rate. As shown in FIG. 10, when considering the influence of the radius of curvature R / wall thickness T1 on the pressure drop rate, when (R / T1) × 100 ≧ 25 is set, the pressure drop rate is significantly reduced, and the water tightness and It turns out that airtightness becomes favorable. In other words, it can be seen that the smaller the curvature of the chamfered portion, the better the water tightness and air tightness. On the other hand, if this condition is not satisfied, the pressure drop rate increases, and the water tightness and air tightness are lowered.

DESCRIPTION OF SYMBOLS 1 Hollow container 2 1st member 3 2nd member 11 Bottom part 12 Side wall part 13 Joining part 14 Recessed part 13a Long side part 13b Short side part 13c Corner | angular part 13d Chamfering part 13e Chamfering part 45 Channel hole 64 Header channel hole J1 Butting part J2 Butt part T1 Wall thickness T2 Wall thickness T3 Wall thickness T4 Length

Claims (6)

A first member having a bottom portion, a side wall portion standing on the bottom portion, and a rectangular frame-shaped joint portion formed on the upper side of the side wall portion and a second member for closing the opening of the first member are prepared. A preparation process to
A friction welding process in which the first member and the second member are reciprocated linearly and frictionally while bringing the joint portion and the second member into surface contact with each other, and
The joint includes a pair of long sides, a pair of short sides, and four corners connecting the long sides and the short sides, and at least one of the four corners. A method for producing a hollow container, wherein an outer corner is chamfered.   The method for manufacturing a hollow container according to claim 1, wherein outer corners of all the corners are chamfered.   The method for manufacturing a hollow container according to claim 1, wherein the outer corner portion is rounded and chamfered.   4. The hollow container according to claim 3, wherein (R / T1) × 100 ≧ 25 is satisfied, where R is a curvature radius of chamfering and T1 is a wall thickness of a long side portion of the joint portion. Production method.   5. Any one of claims 1 to 4, wherein T <b> 2> T <b> 1, where T <b> 1 is a wall thickness of a long side portion of the joint portion and T <b> 2 is a wall thickness of a short side portion of the joint portion. A method for producing the hollow container according to claim 1.   The first member is formed with a plurality of channel holes, and the second member is formed with a header channel hole communicating with the plurality of channel holes. The manufacturing method of the hollow container as described in any one of Claims 5.

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