JP7075698B1 - Heat treatment container and its manufacturing method - Google Patents

Heat treatment container and its manufacturing method Download PDF

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JP7075698B1
JP7075698B1 JP2022002754A JP2022002754A JP7075698B1 JP 7075698 B1 JP7075698 B1 JP 7075698B1 JP 2022002754 A JP2022002754 A JP 2022002754A JP 2022002754 A JP2022002754 A JP 2022002754A JP 7075698 B1 JP7075698 B1 JP 7075698B1
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雅彦 道念
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ミクニ機工株式会社
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Abstract

【課題】熱処理用容器の製造コストを下げることができる熱処理用容器及びその製造方法を提供する。【解決手段】熱処理用容器１は、上方が開口し、四方を囲む側壁２と下方を塞ぐ底壁３とを有する直方体形状に形成される。側壁２は互いに同一形状の４つの単位壁４から構成される。各単位壁４はロストワックス法で形成される。単位壁４同士は溶接される。各単位壁４は底壁３にも溶接される。単位壁４の縦断面が波形状であり、波形状を構成する各盛上部の頂点部には周方向に沿って複数の貫通孔が形成される。さらに、単位壁４は隣りの単位壁４と突き合わさる突合せ部を有する。側壁２は、隣り合う一方の単位壁４の突合せ部と他方の単位壁４の突合せ部とを貫通するとともに、両方の突合せ部に溶接されたピンを備える。【選択図】図１PROBLEM TO BE SOLVED: To provide a heat treatment container and a method for producing the same, which can reduce the production cost of the heat treatment container. SOLUTION: A heat treatment container 1 is formed in a rectangular parallelepiped shape having an upper side opening, a side wall 2 surrounding all four sides, and a bottom wall 3 closing the lower side. The side wall 2 is composed of four unit walls 4 having the same shape as each other. Each unit wall 4 is formed by a lost wax method. The unit walls 4 are welded to each other. Each unit wall 4 is also welded to the bottom wall 3. The vertical cross section of the unit wall 4 has a wave shape, and a plurality of through holes are formed along the circumferential direction at the apex of each ridge portion forming the wave shape. Further, the unit wall 4 has a butt portion that abuts against the adjacent unit wall 4. The side wall 2 penetrates the butt portion of one adjacent unit wall 4 and the butt portion of the other unit wall 4, and includes a pin welded to both butt portions. [Selection diagram] Fig. 1

Description

本開示は、被熱処理物を入れる熱処理用容器及びその製造方法に関する。 The present disclosure relates to a heat treatment container for containing a heat-treated material and a method for manufacturing the same.

上方が開口し、四方を囲む側壁と下方を塞ぐ底壁とを有する直方体形状の熱処理用容器がある（例えば特許文献１参照）。特許文献１には、ロストワックス法等の精密鋳造法で熱処理用治具（熱処理用容器）を製造することが記載されている。また、特許文献１には、比較的大きな治具（熱処理用容器）を製作するときは、底壁部、側壁部等を２～３個に分割して鋳造し、溶接により一体化することもできると記載されている。 There is a rectangular parallelepiped-shaped heat treatment container having a side wall that opens on all sides and a bottom wall that closes the bottom (see, for example, Patent Document 1). Patent Document 1 describes that a heat treatment jig (heat treatment container) is manufactured by a precision casting method such as a lost wax method. Further, in Patent Document 1, when a relatively large jig (heat treatment container) is manufactured, the bottom wall portion, the side wall portion, etc. may be divided into two or three pieces, cast, and integrated by welding. It is stated that it can be done.

特許第３３２７４３６号公報Japanese Patent No. 3327436

従来では、熱処理用容器の製造コストが高いという問題点があった。そこで、本開示は、熱処理用容器の製造コストを下げることができる熱処理用容器及びその製造方法を提供することを課題とする。 Conventionally, there has been a problem that the manufacturing cost of the heat treatment container is high. Therefore, it is an object of the present disclosure to provide a heat treatment container and a method for manufacturing the same, which can reduce the manufacturing cost of the heat treatment container.

本開示の熱処理用容器は、
上方が開口し、四方を囲む側壁と下方を塞ぐ底壁とを有する直方体形状であり、
前記側壁は鋳造製であり、
前記側壁は、前記側壁の周方向に沿った位置のうち前記側壁の角部以外の位置で分割された複数の単位壁で構成されており、
複数の前記単位壁のそれぞれが隣りの前記単位壁に溶接され、かつ、前記底壁に溶接されており、
複数の前記単位壁のそれぞれは、他の少なくとも１つの前記単位壁と同一形状に形成される。 The heat treatment container of the present disclosure is
It is a rectangular parallelepiped shape with an opening at the top and a side wall surrounding all four sides and a bottom wall blocking the bottom.
The side wall is made of casting
The side wall is composed of a plurality of unit walls divided at positions other than the corners of the side wall among the positions along the circumferential direction of the side wall.
Each of the plurality of unit walls is welded to the adjacent unit wall and is welded to the bottom wall.
Each of the plurality of unit walls is formed in the same shape as the other at least one unit wall.

また、本開示の熱処理用容器の製造方法は、
前記単位壁を鋳造により形成する鋳造工程と、
複数の前記単位壁及び前記底壁を溶接により一体化する溶接工程と、
を備える。 Further, the method for manufacturing the heat treatment container of the present disclosure is described.
The casting process of forming the unit wall by casting and
A welding process in which a plurality of the unit walls and the bottom wall are integrated by welding,
To prepare for.

本開示の熱処理用容器及びその製造方法によれば、側壁が鋳造製の複数の単位壁で構成され、各単位壁は他の少なくとも１つの単位壁と同一形状に形成されるので、各単位壁を形成するための鋳造用の型を共通化できる。また、側壁が複数の単位壁で構成されるので、側壁を形成するための鋳造用の型を小さくできる。これにより、熱処理用容器の製造コストを下げることができる。また、各単位壁は側壁の角部以外の位置で分割されるので、熱応力がかかりやすい角部が破損するのを抑制できる。また、角部以外の位置で単位壁同士が溶接されるので、その溶接をしやすくできる。なお、本開示における「直方体形状」とは、縦、横、高さの比が１：１：１となる立方体形状も含む。 According to the heat treatment container and the manufacturing method thereof of the present disclosure, since the side wall is composed of a plurality of unit walls made of cast and each unit wall is formed in the same shape as at least one other unit wall, each unit wall is formed. It is possible to standardize the casting mold for forming. Further, since the side wall is composed of a plurality of unit walls, the casting mold for forming the side wall can be reduced. As a result, the manufacturing cost of the heat treatment container can be reduced. Further, since each unit wall is divided at a position other than the corner portion of the side wall, it is possible to suppress damage to the corner portion where thermal stress is likely to be applied. Further, since the unit walls are welded to each other at positions other than the corners, the welding can be facilitated. The "cuboidal shape" in the present disclosure also includes a cubic shape in which the ratio of length, width, and height is 1: 1: 1.

熱処理用容器の斜視図である。It is a perspective view of the heat treatment container. 熱処理用容器の上面図（平面図）である。It is a top view (plan view) of the heat treatment container. 熱処理用容器を図２のＸ１方向から見た側面図である。It is a side view which looked at the heat treatment container from the X1 direction of FIG. 熱処理用容器を図２のＸ２方向から見た側面図である。It is a side view which looked at the heat treatment container from the X2 direction of FIG. 熱処理用容器を、図２のＶ－Ｖ線で切った縦断面図である。It is a vertical cross-sectional view which cut the heat treatment container by the VV line of FIG. 単位壁の斜視図である。It is a perspective view of a unit wall. 単位壁の平面図である。It is a plan view of a unit wall. 単位壁を図７のＸ３方向から見た側面図である。It is a side view which looked at the unit wall from the X3 direction of FIG. 単位壁を図７のＸ４方向から見た側面図である。It is a side view which looked at the unit wall from the X4 direction of FIG. 図５のＢ部の拡大図であり、側壁の波形状の構成する盛上部の拡大断面図である。FIG. 5 is an enlarged view of a portion B in FIG. 5, and is an enlarged cross-sectional view of a raised portion having a wavy shape on the side wall. 図１のＡ部における断面図であり、隣り合う単位壁の各突合せ部とピンとの固定を示す断面図である。It is a cross-sectional view of the part A of FIG. 1, and is the cross-sectional view which shows the fixing of each butt part of the adjacent unit wall, and a pin. 底板の斜視図である。It is a perspective view of a bottom plate. ベースの斜視図である。It is a perspective view of a base. 熱処理用容器の製造方法の一例を示すフローチャートである。It is a flowchart which shows an example of the manufacturing method of the heat treatment container.

以下、本開示の実施形態を図面を参照しつつ説明する。図１～図４に、本実施形態の熱処理用容器（以下、単に容器という場合がある）を示す。図１～図４の容器１は、被熱処理物に対して熱処理を行う際に、その被熱処理物を入れるための容器である。すなわち、容器１は、被熱処理物を入れた状態で熱処理炉の中に搬送されるように用いられる。なお、容器１は、同時に複数の被熱処理物を入れるように用いられてもよいし、１つの被熱処理物のみを入れるように用いられてもよい。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. 1 to 4 show the heat treatment container of the present embodiment (hereinafter, may be simply referred to as a container). The container 1 of FIGS. 1 to 4 is a container for putting the heat-treated object when heat-treating the object to be heat-treated. That is, the container 1 is used so as to be transported into the heat treatment furnace with the object to be heat-treated. The container 1 may be used to contain a plurality of heat-treated objects at the same time, or may be used to contain only one heat-treated object.

容器１は、上方が開口し、四方を囲む側壁２と下方を塞ぐ底壁３とを有する直方体形状に形成されている。また、容器１（側壁２及び底壁３）は鋳造製であり、より具体的には、精密鋳造法の一つであるロストワックス法で製造された物である。また、容器１（側壁２及び底壁３）はステンレス鋼等の鋼材で形成される。 The container 1 is formed in a rectangular parallelepiped shape having an opening at the upper side, a side wall 2 surrounding all four sides, and a bottom wall 3 closing the lower side. Further, the container 1 (side wall 2 and bottom wall 3) is made by casting, and more specifically, it is manufactured by the lost wax method, which is one of the precision casting methods. Further, the container 1 (side wall 2 and bottom wall 3) is made of a steel material such as stainless steel.

側壁２は、図２の平面視（上面視）で見て、上方に、長手方向（図２の紙面で左右方向）と、それに直交する短手方向（図２の紙面で上下方向）とを有した長方形の開口２ａ（図１も参照）を形成するように設けられる。開口２ａは、容器１への被熱処理物の出入口として機能する。また、側壁２は、図２の平面視で見て、側壁２の周方向（長方形の開口２ａに沿った方向）に沿った位置のうち、側壁２の角部５ｃ以外の位置１１で４つに等分割された単位壁４で構成されている。側壁２の分割位置１１（後述の突合せ部）は、図２の平面視で見て、長方形を構成する各辺の中点の位置である。各単位壁４は、各辺の中点位置１１を通る、図２の紙面に直角かつ各辺に直角な面で、直方体の側壁２を分割した形状を有する。なお、各単位壁４は、容器１の状態では、互いに一体化されて、分離不可能に設けられる。 The side wall 2 has a longitudinal direction (horizontal direction on the paper surface of FIG. 2) and a lateral direction orthogonal to the longitudinal direction (vertical direction on the paper surface of FIG. 2) when viewed from the plan view (top view) of FIG. It is provided so as to form a rectangular opening 2a (see also FIG. 1) having a rectangle. The opening 2a functions as an entrance / exit for the object to be heat-treated to the container 1. Further, there are four side walls 2 at positions 11 other than the corner portion 5c of the side wall 2 among the positions along the circumferential direction of the side wall 2 (direction along the rectangular opening 2a) when viewed in the plan view of FIG. It is composed of a unit wall 4 equally divided into two. The division position 11 (butting portion described later) of the side wall 2 is the position of the midpoint of each side constituting the rectangle when viewed in the plan view of FIG. Each unit wall 4 has a shape in which the side wall 2 of a rectangular parallelepiped is divided by a surface perpendicular to the paper surface of FIG. 2 and perpendicular to each side, passing through the midpoint position 11 of each side. In the state of the container 1, each unit wall 4 is integrated with each other and is provided inseparably.

具体的にいえば、４つの単位壁４は互いに同一形状に形成される。すなわち、各単位壁４は上下対称形に形成されている。図２において、左上に位置する単位壁４Ａ、右上に位置する単位壁４Ｂ、右下に位置する単位壁４Ｃ、及び左下に位置する単位壁４Ｄが仮に互いに分離可能であるとすると、右下の単位壁４Ｃを中心Ｏ回りに回転移動させると、左上の単位壁４Ａに一致する。また、右上の単位壁４Ｂを上下反転させたのち、回転移動及び／又は平行移動させると、左上の単位壁４Ａに一致する。また、左下の単位壁４Ｄを上下反転させたのち、回転移動及び／又は平行移動させると、左上の単位壁４Ａに一致する。 Specifically, the four unit walls 4 are formed in the same shape as each other. That is, each unit wall 4 is formed vertically symmetrically. In FIG. 2, assuming that the unit wall 4A located at the upper left, the unit wall 4B located at the upper right, the unit wall 4C located at the lower right, and the unit wall 4D located at the lower left are separable from each other, the lower right When the unit wall 4C is rotationally moved around the center O, it coincides with the upper left unit wall 4A. Further, when the upper right unit wall 4B is turned upside down and then rotated and / or translated, it coincides with the upper left unit wall 4A. Further, when the lower left unit wall 4D is turned upside down and then rotated and / or moved in parallel, it coincides with the upper left unit wall 4A.

図６～図９は１つの単位壁４を抜き出した図であり、すなわち、側壁２として一体化される前の単位壁４を示している。単位壁４は、板状に形成された板部５を有する。板部５は、図７の平面視で見て、直角な屈曲した形状に形成され、言い換えれば、Ｌ字形状に形成される。すなわち、板部５は、図７の平面視で見て、第１方向Ｄに延びた第１部分５ａと、第１方向Ｄに直角な第２方向Ｅに延びた第２部分５ｂとを有する。第１部分５ａの第１方向Ｄにおける長さは、第２部分５ｂの第２方向Ｅにおける長さよりも長い。また、第１部分５ａと第２部分５ｂとの境界部５ｃ（板部５の角部５ｃ）は、図７の平面視で見て、例えば曲率半径が２０ｍｍ以上の円弧状に形成される。 6 to 9 are views of one unit wall 4 extracted, that is, the unit wall 4 before being integrated as the side wall 2 is shown. The unit wall 4 has a plate portion 5 formed in a plate shape. The plate portion 5 is formed in a bent shape at a right angle when viewed in the plan view of FIG. 7, in other words, is formed in an L shape. That is, the plate portion 5 has a first portion 5a extending in the first direction D and a second portion 5b extending in the second direction E perpendicular to the first direction D when viewed in a plan view of FIG. 7. .. The length of the first portion 5a in the first direction D is longer than the length of the second portion 5b in the second direction E. Further, the boundary portion 5c (corner portion 5c of the plate portion 5) between the first portion 5a and the second portion 5b is formed in an arc shape having a radius of curvature of 20 mm or more, for example, when viewed in a plan view of FIG.

また、板部５の縦断面（図７に示す方向Ｄ又は方向Ｅに直角な断面）が波形状である。具体的には、板部５は、図５、図８、図９に示すように、上下方向に沿って、上から順に、平坦部６、複数の盛上部７（本実施形態では３つ）、及び平坦部６を有する。上下の平坦部６は、容器１の上下方向に平行な平坦面に形成され、言い換えれば、水平面（容器１の上下方向に直角な面）に直角な平坦面に形成される。盛上部７は、平坦部６よりも水平方向の外側に山状に盛り上がるように形成される。具体的には、盛上部７は、図１０に示すように、水平方向外側に最も突出した頂点部７ａと、頂点部７ａから上方に向かうにしたがって徐々に内側に変位する第１傾斜部７ｂと、頂点部７ａから下方に向かうにしたがって徐々に内側に変位する第２傾斜部７ｃとを有する。そして、各盛上部７の上下両側には、頂点部７ａから見て内側に最も凹んだ谷部７ｄを有する。谷部７ｄは、平坦部６と盛上部７との境界部、又は隣り合う盛上部７同士の境界部である。 Further, the vertical cross section of the plate portion 5 (the cross section perpendicular to the direction D or the direction E shown in FIG. 7) has a wavy shape. Specifically, as shown in FIGS. 5, 8 and 9, the plate portion 5 has a flat portion 6 and a plurality of raised portions 7 (three in the present embodiment) in order from the top in the vertical direction. , And a flat portion 6. The upper and lower flat portions 6 are formed on a flat surface parallel to the vertical direction of the container 1, in other words, formed on a flat surface perpendicular to a horizontal plane (a surface perpendicular to the vertical direction of the container 1). The raised portion 7 is formed so as to rise in a mountain shape on the outer side in the horizontal direction with respect to the flat portion 6. Specifically, as shown in FIG. 10, the ridge portion 7 has a apex portion 7a that protrudes most outward in the horizontal direction and a first inclined portion 7b that gradually displaces inward as it goes upward from the apex portion 7a. It has a second inclined portion 7c that is gradually displaced inward as it goes downward from the apex portion 7a. Further, on both the upper and lower sides of each ridge portion 7, the valley portion 7d which is the most recessed inward when viewed from the apex portion 7a is provided. The valley portion 7d is a boundary portion between the flat portion 6 and the ridge portion 7, or a boundary portion between adjacent ridge portions 7.

また、図１０に示すように、上側の谷部７ｄと頂点部７ａとの間の上下方向における幅ｄ１（第１傾斜部７ｂの上下幅）と、下側の谷部７ｄと頂点部７ａとの間の上下方向における幅ｄ２（第２傾斜部７ｃの上下幅）とが同じである。さらに、上側の谷部７ｄと頂点部７ａとの間の水平方向における幅ｄ３（第１傾斜部７ｂの水平幅）と、下側の谷部７ｄと頂点部７ａとの間の水平方向における幅ｄ４（第２傾斜部７ｃの水平幅）とが同じである。 Further, as shown in FIG. 10, the width d1 (vertical width of the first inclined portion 7b) in the vertical direction between the upper valley portion 7d and the apex portion 7a, and the lower valley portion 7d and the apex portion 7a. The width d2 (vertical width of the second inclined portion 7c) in the vertical direction between the two is the same. Further, the horizontal width d3 (horizontal width of the first inclined portion 7b) between the upper valley portion 7d and the apex portion 7a and the horizontal width between the lower valley portion 7d and the apex portion 7a. It is the same as d4 (horizontal width of the second inclined portion 7c).

複数の盛上部７（本実施形態では３つ）は、互いに同一の断面形状（図１０で示される断面形状）である。すなわち、各盛上部７の各頂点部７ａの外側への突出量（谷部７ｄに対する頂点部７ａの突出量）は複数の盛上部７の間で互いに同一である。また、複数の盛上部７は上下方向に連続するように設けられる。 The plurality of ridges 7 (three in the present embodiment) have the same cross-sectional shape (cross-sectional shape shown in FIG. 10). That is, the amount of protrusion of each apex portion 7a of each ridge portion 7 to the outside (the amount of protrusion of the apex portion 7a with respect to the valley portion 7d) is the same among the plurality of ridge portions 7. Further, the plurality of ridges 7 are provided so as to be continuous in the vertical direction.

また、上下の平坦部６及びその間に設けられる複数の盛上部７から構成される波形状は、板部５の第１部分５ａ（図７の第１方向Ｄに延びた部分）と、第２部分５ｂ（図７の第２方向Ｅに延びた部分）の双方に形成される（図８、図９参照）。さらに、第１部分５ａに形成される波形状と、第２部分５ｂに形成される波形状とは互いに同一の縦断面形状であるとともに、それら双方の波形状が角部５ｃを介して連続している。すなわち、板部５の角部５ｃにも波形状が形成されている。このように、波形状を構成する各平坦部６及び各盛上部７は、図７の平面視で見たＬ字に沿った方向に連続するように形成される。なお、以下では、図７の平面視で見て、単位壁４におけるＬ字に沿った方向を単位壁４（板部５）の水平延設方向又は周方向という場合がある。 Further, the wave shape composed of the upper and lower flat portions 6 and the plurality of raised portions 7 provided between them is the first portion 5a of the plate portion 5 (the portion extending in the first direction D in FIG. 7) and the second portion. It is formed on both sides of the portion 5b (the portion extending in the second direction E in FIG. 7) (see FIGS. 8 and 9). Further, the wave shape formed in the first portion 5a and the wave shape formed in the second portion 5b have the same vertical cross-sectional shape, and both wave shapes are continuous via the corner portion 5c. ing. That is, a wave shape is also formed on the corner portion 5c of the plate portion 5. In this way, each flat portion 6 and each ridge portion 7 constituting the wave shape are formed so as to be continuous in the direction along the L-shape seen in the plan view of FIG. 7. In the following, the direction along the L-shape of the unit wall 4 may be referred to as the horizontal extension direction or the circumferential direction of the unit wall 4 (plate portion 5) when viewed from the plan view of FIG. 7.

また、各盛上部７の頂点部７ａには、頂点部７ａの延設方向（Ｌ字に沿った方向）に沿って複数の貫通孔８が形成されている（図８、図９参照）。貫通孔８は、頂点部７ａの延設方向に沿って等間隔（ただし、角部５ｃは除く）かつ互いに同一形状（同一径の円形）に形成される。また、貫通孔８は、３つの盛上部７（頂点部７ａ）の間で、互いに同一間隔、かつ、互いに同一個数、かつ、互いに同一形状に形成される。 Further, a plurality of through holes 8 are formed in the apex portion 7a of each ridge portion 7 along the extending direction (direction along the L-shape) of the apex portion 7a (see FIGS. 8 and 9). The through holes 8 are formed at equal intervals (excluding the corner portions 5c) along the extending direction of the apex portions 7a and have the same shape (circles having the same diameter). Further, the through holes 8 are formed between the three ridges 7 (apex 7a) at the same distance from each other, in the same number as each other, and in the same shape as each other.

また、上下の平坦部６には、平坦部６の延設方向（Ｌ字に沿った方向）に沿って複数の貫通孔９が形成されている（図８、図９参照）。貫通孔９は、平坦部６の延設方向に沿って等間隔（ただし、角部５ｃは除く）かつ互いに同一形状（同一径の円形）に形成される。また、貫通孔９は、上下の平坦部６の間で、互いに同一間隔、かつ、互いに同一個数、かつ、互いに同一形状に形成される。このように、板部５には、周方向の全周に亘って複数の貫通孔８、９が形成され、そのその周方向の貫通孔８、９の配列が上下方向に複数列形成されている。 Further, in the upper and lower flat portions 6, a plurality of through holes 9 are formed along the extending direction (direction along the L-shape) of the flat portions 6 (see FIGS. 8 and 9). The through holes 9 are formed at equal intervals (excluding the corner portions 5c) along the extending direction of the flat portion 6 and have the same shape (circles having the same diameter). Further, the through holes 9 are formed between the upper and lower flat portions 6 at the same distance from each other, in the same number as each other, and in the same shape as each other. In this way, a plurality of through holes 8 and 9 are formed in the plate portion 5 over the entire circumference in the circumferential direction, and a plurality of rows of through holes 8 and 9 in the circumferential direction are formed in the vertical direction. There is.

また、単位壁４は、屈曲形状の板部５の上端及び下端から水平方向外側に出っ張る出張り部１０を有する。上下の出張り部１０は、板部５の上端及び下端の延設方向（図７のＬ字に沿った方向）に沿って連続するよう形成される。また、上下の出張り部１０は互いに同一の平面視形状に形成される。 Further, the unit wall 4 has a protruding portion 10 that protrudes outward in the horizontal direction from the upper end and the lower end of the bent plate portion 5. The upper and lower protruding portions 10 are formed so as to be continuous along the extending direction (direction along the L-shape in FIG. 7) of the upper end and the lower end of the plate portion 5. Further, the upper and lower protruding portions 10 are formed in the same plan view shape as each other.

また、単位壁４は、板部５の水平延設方向（Ｌ字に沿った方向）の両端部（以下、板部５の周方向端部という場合がある）に、その水平延設方向に直角な水平方向の外側に出っ張る形状の出張り部１１を有する（図６、図８、図９参照）。出張り部１１は、板部５の周方向端部の延設方向（つまり上下方向）に沿って延設されている。ここで、上下方向に並ぶ３つの盛上部７の各頂点部７ａを上から第１の頂点部、第２の頂点部、及び第３の頂点部と称する。出張り部１１は、上側の平坦部６の上端（言い換えれば上側の出張り部１０）から第１の頂点部７ａまでに亘って形成される第１部分１１ａと、第１の頂点部７ａから第２の頂点部７ａまでに亘って形成される第２部分１１ｂと、第２の頂点部７ａから第３の頂点部７ａまでに亘って形成される第３部分１１ｃと、第３の頂点部７ａから下側の平坦部６の下端（言い換えれば、下側の出張り部１０）までに亘って形成される第４部分１１ｄとを含んで構成される。これら各部分１１ａ～１１ｄの突出方向の先端１１ｅ（図８、図９参照）は、３つの頂点７ａを通る、上下方向に延びた直線を描くように設けられる。すなわち、出張り部１１（第１～第４部分１１ａ～１１ｄ）の外側への突出量は頂点部７ａの突出量と同じである。言い換えれば、出張り部１１は、平坦部６及び盛上部７の上下両側の谷部７ｄ（図１０参照）に対しては外側に出っ張っているが、頂点部７ａに対しては外側に出っ張っていない。出張り部１１は、隣り合う単位壁４同士が突き合わさる突合せ部として機能する。以下、出張り部１１を突合せ部又は周方向端部という場合がある。 Further, the unit wall 4 is provided at both ends of the plate portion 5 in the horizontal extension direction (direction along the L-shape) (hereinafter, may be referred to as peripheral end portions of the plate portion 5) in the horizontal extension direction. It has a protruding portion 11 having a shape protruding outward in a horizontal direction at a right angle (see FIGS. 6, 8, and 9). The protruding portion 11 extends along the extending direction (that is, the vertical direction) of the peripheral end portion of the plate portion 5. Here, each apex portion 7a of the three ridges 7 arranged in the vertical direction is referred to as a first apex portion, a second apex portion, and a third apex portion from the top. The protrusion 11 is formed from the first portion 11a formed from the upper end of the upper flat portion 6 (in other words, the upper protrusion 10) to the first apex portion 7a, and from the first apex portion 7a. A second portion 11b formed over the second apex portion 7a, a third portion 11c formed over the second apex portion 7a to the third apex portion 7a, and a third apex portion. It is configured to include a fourth portion 11d formed from 7a to the lower end of the lower flat portion 6 (in other words, the lower protruding portion 10). The tip 11e (see FIGS. 8 and 9) of each of the portions 11a to 11d in the protruding direction is provided so as to draw a straight line extending in the vertical direction through the three vertices 7a. That is, the amount of protrusion of the protruding portion 11 (first to fourth portions 11a to 11d) to the outside is the same as the amount of protrusion of the apex portion 7a. In other words, the protruding portion 11 protrudes outward with respect to the valley portions 7d (see FIG. 10) on both the upper and lower sides of the flat portion 6 and the raised portion 7, but protrudes outward with respect to the apex portion 7a. do not have. The protruding portion 11 functions as a butt portion where adjacent unit walls 4 abut against each other. Hereinafter, the protruding portion 11 may be referred to as a butt portion or a circumferential end portion.

出張り部１１の各部分１１ａ～１１ｄのうち最も上側に位置する第１部分１１ａと、最も下側に位置する第４部分１１ｄとにはそれぞれ貫通孔１２が形成されている。ただし、容器１の状態（単位壁４が一体化された状態）では、この貫通孔１２に後述のピン１５が埋められて溶接された状態になることで、貫通孔１２は外部からは視認できない。なお、貫通孔１２は、１つの単位壁４当たりに、板部５の一方の周方向端部１１の上下の２箇所と、他方の周方向端部１１の上下の２箇所の、合計４箇所に形成されている。 Through holes 12 are formed in the first portion 11a located on the uppermost side and the fourth portion 11d located on the lowermost side of the respective portions 11a to 11d of the protruding portion 11. However, in the state of the container 1 (the state in which the unit wall 4 is integrated), the through hole 12 is invisible from the outside because the pin 15 described later is buried in the through hole 12 and welded. .. It should be noted that there are a total of four through holes 12 per unit wall 4, two above and below one peripheral end portion 11 of the plate portion 5 and two above and below the other circumferential end portion 11. Is formed in.

さらに、単位壁４は、板部５の外側面から突出するリブ１３、１４を有する（図６、図８、図９参照）。リブ１３、１４は、板部５の水平延設方向に沿って線状に延びた横リブ１３を含む。横リブ１３は、上下方向に間隔をあけて複数（本実施形態では４つ）形成される。複数の横リブ１３は互いに平行に形成される。各横リブ１３は、板部５の谷部７ｄ（図１０参照）の位置に形成される。また、各横リブ１３は、板部５の一方の周方向端部１１から他方の周方向端部１１までに亘って連続して形成されている。横リブ１３は角部５ｃにも形成されている。 Further, the unit wall 4 has ribs 13 and 14 protruding from the outer surface of the plate portion 5 (see FIGS. 6, 8 and 9). The ribs 13 and 14 include lateral ribs 13 extending linearly along the horizontal extension direction of the plate portion 5. A plurality (four in this embodiment) of the lateral ribs 13 are formed at intervals in the vertical direction. The plurality of lateral ribs 13 are formed parallel to each other. Each lateral rib 13 is formed at the position of the valley portion 7d (see FIG. 10) of the plate portion 5. Further, each lateral rib 13 is continuously formed from one circumferential end portion 11 of the plate portion 5 to the other circumferential direction end portion 11. The lateral rib 13 is also formed at the corner portion 5c.

また、リブ１３、１４は、上下方向に線状に延びた縦リブ１４を含む（図６、図８、図９参照）。縦リブ１４は、水平延設方向に沿って間隔をあけて複数列形成されている。さらに、各列の縦リブ１４は、各横リブ１３（言いかえれば、板部５の谷部７ｄ）に交差するように、かつ、盛上部７の頂点部７ａには交差しないように、上下方向に断続的に（言い換えれば、上下方向に間隔をあけて）形成されている。より具体的には、各列の縦リブ１４は、板部５の各平坦部６の上下方向幅の全体を跨ぎ、かつ、平坦部６に隣接した横リブ１３に交差する端リブ１４ａと、上下方向に配列された複数の横リブ１３のうち平坦部６から距離をあけて形成される中間横リブ１３に交差する中間リブ１４ｂとを含む。さらに、縦リブ１４は、角部５ｃ（図６参照）の位置に形成される角リブ１４ｃを含む。 Further, the ribs 13 and 14 include vertical ribs 14 extending linearly in the vertical direction (see FIGS. 6, 8 and 9). The vertical ribs 14 are formed in a plurality of rows at intervals along the horizontal extension direction. Further, the vertical ribs 14 in each row are up and down so as to intersect each horizontal rib 13 (in other words, the valley portion 7d of the plate portion 5) and not to intersect the apex portion 7a of the raised portion 7. It is formed intermittently in the direction (in other words, spaced vertically). More specifically, the vertical ribs 14 in each row have end ribs 14a that straddle the entire vertical width of each flat portion 6 of the plate portion 5 and intersect the horizontal ribs 13 adjacent to the flat portions 6. Among the plurality of lateral ribs 13 arranged in the vertical direction, the intermediate ribs 14b intersecting the intermediate lateral ribs 13 formed at a distance from the flat portion 6 are included. Further, the vertical rib 14 includes a square rib 14c formed at the position of the corner portion 5c (see FIG. 6).

４つの単位壁４は溶接により分離不可能に一体化されている。このとき、第１の単位壁４Ａ（図２参照）の第１部分５ａ（図７参照）の周方向端部１１（出張り部）と、第２の単位壁４Ｂ（図２参照）の第１部分５ａの周方向端部１１（出張り部）とが突き合わさり、かつ溶接されている。また、第１の単位壁４Ａの第２部分５ｂ（図７参照）の周方向端部１１と、第４の単位壁４Ｄ（図２参照）の第２部分５ｂの周方向端部１１とが突き合わさり、かつ溶接されている。また、第２の単位壁４Ｂの第２部分５ｂの周方向端部１１と、第３の単位壁４Ｃの第２部分５ｂの周方向端部１１とが突き合わさり、かつ溶接されている。また、第３の単位壁４Ｃの第１部分５ａの周方向端部１１と、第４の単位壁４Ｄの第１部分５ａの周方向端部１１とが突き合わさり、かつ溶接されている。 The four unit walls 4 are inseparably integrated by welding. At this time, the circumferential end portion 11 (protruding portion) of the first portion 5a (see FIG. 7) of the first unit wall 4A (see FIG. 2) and the second unit wall 4B (see FIG. 2). The peripheral end portion 11 (protruding portion) of the 1 portion 5a is abutted and welded. Further, the circumferential end portion 11 of the second portion 5b (see FIG. 7) of the first unit wall 4A and the circumferential end portion 11 of the second portion 5b of the fourth unit wall 4D (see FIG. 2) are formed. Butted and welded. Further, the circumferential end portion 11 of the second portion 5b of the second unit wall 4B and the circumferential end portion 11 of the second portion 5b of the third unit wall 4C are abutted and welded. Further, the circumferential end portion 11 of the first portion 5a of the third unit wall 4C and the circumferential end portion 11 of the first portion 5a of the fourth unit wall 4D are abutted and welded to each other.

図３、図４に示すように、側壁２は、隣り合う単位壁４同士の突合せ部１１（周方向端部）の位置に溶接部１００を有する。図３、図４の例では、溶接部１００は、突合せ部１１の延設方向（上下方向）に沿って断続的に複数の箇所に形成されるが、突合せ部１１の上端から下端までに亘って連続的に形成されてもよい。なお、側壁２の角部５ｃには溶接部は存在しない。 As shown in FIGS. 3 and 4, the side wall 2 has a welded portion 100 at a position of a butt portion 11 (end portion in the circumferential direction) between adjacent unit walls 4. In the examples of FIGS. 3 and 4, the welded portions 100 are formed at a plurality of positions intermittently along the extending direction (vertical direction) of the butt portion 11, but extend from the upper end to the lower end of the butt portion 11. May be formed continuously. There is no welded portion at the corner portion 5c of the side wall 2.

さらに、４つの単位壁４が一体化された状態では、周方向端部１１の上下に形成された貫通孔１２（図６、図８、図９参照）が、隣り合う単位壁４同士で合わさって、合わさった両方の貫通孔１２にピン１５が挿通されている（図１１参照）。すなわち、ピン１５は、隣り合う一方の単位壁４の突合せ部１１（周方向端部）と、他方の単位壁４の突合せ部１１（周方向端部）とを貫通するように設けられる。そして、ピン１５の軸方向における一方の端部が一方の突合せ部１１に溶接され、ピン１５の軸方向における他方の端部が他方の突合せ部１１に溶接されている。図１１に示すように、側壁２は、ピン１５の両端部の位置に溶接部１０１を有する。この溶接部１０１により、ピン１５の端部が溶けて潰されている。また、貫通孔１２の開口は溶接部１０１で閉塞されている。このため、外部からはピン１５及び貫通孔１２が視認できないようになっている。 Further, in the state where the four unit walls 4 are integrated, the through holes 12 (see FIGS. 6, 8, and 9) formed above and below the circumferential end 11 are joined to each other by the adjacent unit walls 4. A pin 15 is inserted through both of the combined through holes 12 (see FIG. 11). That is, the pin 15 is provided so as to penetrate the butt portion 11 (circumferential end portion) of one of the adjacent unit walls 4 and the butt portion 11 (circumferential end portion) of the other unit wall 4. Then, one end of the pin 15 in the axial direction is welded to the one butt portion 11, and the other end of the pin 15 in the axial direction is welded to the other butt portion 11. As shown in FIG. 11, the side wall 2 has welds 101 at positions at both ends of the pin 15. The welded portion 101 melts and crushes the end portion of the pin 15. Further, the opening of the through hole 12 is closed by the welded portion 101. Therefore, the pin 15 and the through hole 12 cannot be visually recognized from the outside.

側壁２の分割位置１１（突合せ部に相当）（図２参照）は４箇所あり、各分割位置１１毎に上下それぞれで図１１に示すピン１５による固定が行われている。つまり、側壁２は、合計８箇所でピン１５による固定部を有する。 There are four division positions 11 (corresponding to the butt joints) (see FIG. 2) of the side wall 2, and each division position 11 is fixed by a pin 15 shown in FIG. 11 at the top and bottom respectively. That is, the side wall 2 has a fixed portion by the pin 15 at a total of eight points.

また、各単位壁４（側壁２）は、溶接により底壁３に分離不可能に固定されている。具体的には、各単位壁４の下側の出張り部１０（図６参照）が、底壁３の一部を構成するベース１７（図１３参照）の上面に溶接されている。図３、図４に示すように、容器１は、単位壁４の下側の出張り部１０とベース１７の上面とを固定する溶接部１０２を有する。図３、図４の例では、溶接部１０２は、側壁２の周方向に沿って断続的に複数の箇所に形成されるが、側壁２の周方向の全周に亘って連続して形成されてもよい。 Further, each unit wall 4 (side wall 2) is inseparably fixed to the bottom wall 3 by welding. Specifically, the lower protruding portion 10 (see FIG. 6) of each unit wall 4 is welded to the upper surface of the base 17 (see FIG. 13) forming a part of the bottom wall 3. As shown in FIGS. 3 and 4, the container 1 has a welded portion 102 for fixing the lower protruding portion 10 of the unit wall 4 and the upper surface of the base 17. In the examples of FIGS. 3 and 4, the welded portions 102 are formed at a plurality of locations intermittently along the circumferential direction of the side wall 2, but are continuously formed over the entire circumference of the side wall 2 in the circumferential direction. You may.

また、各単位壁４（側壁２）は、底壁３の一部を構成する底板１６（図１２参照）にも溶接により固定されている。具体的には、底板１６の外周縁部が各単位壁４の内面に溶接されている。図５に示すように、容器１は、単位壁４の内面と、底板１６の外周縁部とを固定する溶接部１０３を有する。図５の例では、溶接部１０３は、底板１６の周方向に沿って断続的に複数の箇所に形成されるが、底壁１６の周方向の全周に亘って連続して形成されてもよい。 Further, each unit wall 4 (side wall 2) is also fixed to a bottom plate 16 (see FIG. 12) forming a part of the bottom wall 3 by welding. Specifically, the outer peripheral edge portion of the bottom plate 16 is welded to the inner surface of each unit wall 4. As shown in FIG. 5, the container 1 has a welded portion 103 for fixing the inner surface of the unit wall 4 and the outer peripheral edge portion of the bottom plate 16. In the example of FIG. 5, the welded portions 103 are formed at a plurality of locations intermittently along the circumferential direction of the bottom plate 16, but may be continuously formed over the entire circumference of the bottom wall 16 in the circumferential direction. good.

底壁３は、側壁２の下方を塞ぐように設けられる。上述のように、底壁３は側壁２に溶接により分離不可能に固定されている。底壁３は、図５に示すように、底板１６とベース１７とを備える。底板１６は、図１２に示すように、板状の本体１８と、本体１８の裏面から起立する起立部（リブ）１９とを有する。本体１８は、平面視（図示外）で見て、側壁２の開口２ａの形状（長方形）と同様の形状（つまり長方形）に形成される。具体的には、本体１８は、本体１８の長手方向における両端側に水平部１８ａと、水平部１８ａから長手方向の中心１８ｃに近づくにしたがって徐々に上方に変位する傾斜部１８ｂとを有する。 The bottom wall 3 is provided so as to close the lower part of the side wall 2. As described above, the bottom wall 3 is inseparably fixed to the side wall 2 by welding. The bottom wall 3 includes a bottom plate 16 and a base 17, as shown in FIG. As shown in FIG. 12, the bottom plate 16 has a plate-shaped main body 18 and an upright portion (rib) 19 that stands up from the back surface of the main body 18. The main body 18 is formed in a shape (that is, a rectangle) similar to the shape (rectangle) of the opening 2a of the side wall 2 when viewed in a plan view (not shown). Specifically, the main body 18 has horizontal portions 18a on both ends of the main body 18 in the longitudinal direction, and inclined portions 18b that gradually displace upward from the horizontal portion 18a toward the center 18c in the longitudinal direction.

水平部１８ａは、平面視長方形の本体１８の短手方向の全幅に亘ってベース１７の上面に平行な水平面を形成する。また、各水平部１８ａは、平面視（図示外）で見て、本体１８の短手方向を水平部１８ａの長手方向とし、本体１８の長手方向を水平部１８ａの短手方向とした長方形に形成される。 The horizontal portion 18a forms a horizontal plane parallel to the upper surface of the base 17 over the entire width in the lateral direction of the rectangular main body 18 in a plan view. Further, each horizontal portion 18a has a rectangular shape in which the lateral direction of the main body 18 is the longitudinal direction of the horizontal portion 18a and the longitudinal direction of the main body 18 is the lateral direction of the horizontal portion 18a when viewed in a plan view (not shown). It is formed.

傾斜部１８ｂは、本体１８の長手方向に沿って進むにしたがって徐々に水平部１８ａからの高さが変位するように設けられる。具体的には、傾斜部１８ｂは、本体１８の長手方向幅の中心を通る、本体１８の短手方向に延びた中心線１８ｃ（図１２参照）に長手方向に沿って近づくにしたがって徐々に上方に変位し、反対に、中心線１８ｃから長手方向に沿って遠ざかるにしたがって徐々に下方に変位する。なお、傾斜部１８ｂは、本体１８の短手方向に対しては傾斜していない。 The inclined portion 18b is provided so that the height from the horizontal portion 18a is gradually displaced as the main body 18 advances along the longitudinal direction. Specifically, the inclined portion 18b gradually rises as it approaches the center line 18c (see FIG. 12) extending in the lateral direction of the main body 18 passing through the center of the longitudinal width of the main body 18 along the longitudinal direction. And conversely, it gradually displaces downward as it moves away from the center line 18c along the longitudinal direction. The inclined portion 18b is not inclined with respect to the lateral direction of the main body 18.

本体１８（水平部１８ａ及び傾斜部１８ｂ）には多数の貫通孔２０が形成されている。すなわち、貫通孔２０は、本体１８の長手方向に沿って複数形成されるとともに、本体１８の短手方向に沿って複数形成される。 A large number of through holes 20 are formed in the main body 18 (horizontal portion 18a and inclined portion 18b). That is, a plurality of through holes 20 are formed along the longitudinal direction of the main body 18, and a plurality of through holes 20 are formed along the lateral direction of the main body 18.

起立部１９は、傾斜部１８ｂの裏面から下方に起立（突出）するように設けられる。起立部１９は、本体１８の長手方向に延びた第１起立部と、本体１８の短手方向に延びた第２起立部とを含む。第１起立部１９は、本体１８の短手方向に間隔をあけて複数（本実施形態では２つ）形成される。第２起立部１９は、本体１８の長手方向に間隔をあけて複数（本実施形態では２つ）形成される。第１起立部１９及び第２起立部１９は平面視（図示外）で見て直角に交差するように設けられる。 The upright portion 19 is provided so as to stand up (protrude) downward from the back surface of the inclined portion 18b. The upright portion 19 includes a first upright portion extending in the longitudinal direction of the main body 18 and a second upright portion extending in the lateral direction of the main body 18. A plurality (two in this embodiment) of the first standing portions 19 are formed at intervals in the lateral direction of the main body 18. A plurality of (two in this embodiment) of the second standing portions 19 are formed at intervals in the longitudinal direction of the main body 18. The first standing portion 19 and the second standing portion 19 are provided so as to intersect at right angles when viewed in a plan view (not shown).

各起立部１９の下端（傾斜部１８ｂに接続される側の反対側の端部）は、水平部１８ａと同じ高さ位置に設けられる。 The lower end of each upright portion 19 (the end on the opposite side to the inclined portion 18b) is provided at the same height as the horizontal portion 18a.

図１３に示すベース１７は、容器１の土台となる部材である。ベース１７は、平面視（図示外）で見て、側壁２の平面視形状（長方形）と同様の長方形に形成される。また、ベース１７の上面はベース１７の下面に平行に形成される。 The base 17 shown in FIG. 13 is a member that serves as a base for the container 1. The base 17 is formed into a rectangle similar to the plan view shape (rectangle) of the side wall 2 when viewed in a plan view (not shown). Further, the upper surface of the base 17 is formed parallel to the lower surface of the base 17.

具体的には、ベース１７は、縦断面が直角四角形（つまり長方形又は正方形）の枠を形成する一対のフレーム部２１と、一対のフレーム部２１を連結する連結部２２とを有する。一対のフレーム部２１は互いに同一形状に形成される。各フレーム部２１は、フレーム部２１（ベース１７）の長手方向に対応する一方向に貫通する空間２３を内側に形成し、この空間２３の上方、下方及び側方を囲むように形成されている。フレーム部２１の長手方向における両端には空間２３の開口が形成される。また、フレーム部２１の上面部には、内側の空間２３に導通する貫通孔２４が形成されている。貫通孔２４は、フレーム部２１の長手方向に沿って等間隔に複数形成されている。各貫通孔２４は互いに同一形状に形成される。また、各貫通孔２４は、フレーム部２１の下面部及び側面部に形成される貫通孔２５、２６よりも大きい。また、各貫通孔２４は、連結部２２に形成される貫通孔２７よりも大きい。また、貫通孔２４は、底板１６に形成される貫通孔２０（図１２参照）及び側壁２に形成される貫通孔８、９（図８、図９参照）よりも大きい。本実施形態では、貫通孔２４は長方形又は正方形に形成されるが、他の形状（円形など）でもよい。 Specifically, the base 17 has a pair of frame portions 21 that form a frame having a right-angled quadrangle (that is, a rectangle or a square) in a vertical cross section, and a connecting portion 22 that connects the pair of frame portions 21. The pair of frame portions 21 are formed to have the same shape as each other. Each frame portion 21 forms a space 23 that penetrates in one direction corresponding to the longitudinal direction of the frame portion 21 (base 17) inside, and is formed so as to surround the space 23 above, below, and sideways. .. A space 23 openings are formed at both ends of the frame portion 21 in the longitudinal direction. Further, a through hole 24 that conducts to the inner space 23 is formed on the upper surface portion of the frame portion 21. A plurality of through holes 24 are formed at equal intervals along the longitudinal direction of the frame portion 21. Each through hole 24 is formed to have the same shape as each other. Further, each through hole 24 is larger than the through holes 25 and 26 formed in the lower surface portion and the side surface portion of the frame portion 21. Further, each through hole 24 is larger than the through hole 27 formed in the connecting portion 22. Further, the through hole 24 is larger than the through hole 20 (see FIG. 12) formed in the bottom plate 16 and the through holes 8 and 9 (see FIGS. 8 and 9) formed in the side wall 2. In the present embodiment, the through hole 24 is formed in a rectangular shape or a square shape, but may have another shape (circular shape or the like).

フレーム部２１の下面部には、内側の空間２３に導通する貫通孔２５が形成されている。貫通孔２５は、フレーム部２１の長手方向に沿って間隔をあけて複数形成される。また、長手方向に沿って複数形成される貫通孔２５の列が、フレーム部２１の短手方向に間隔をあけて複数列形成される。各貫通孔２５は互いに同一形状である。貫通孔２５は、フレーム部２１の上面部に形成される貫通孔２４よりも小さい。さらに、貫通孔２５は、フレーム部２１の側面部に形成される貫通孔２６よりも小さい。また、貫通孔２５は、連結部２２に形成される貫通孔２７よりも小さい。貫通孔２５の個数は、上面部の貫通孔２４の個数よりも多い。 A through hole 25 that conducts to the inner space 23 is formed in the lower surface portion of the frame portion 21. A plurality of through holes 25 are formed at intervals along the longitudinal direction of the frame portion 21. Further, a plurality of rows of through holes 25 formed along the longitudinal direction are formed in a plurality of rows at intervals in the lateral direction of the frame portion 21. Each through hole 25 has the same shape as each other. The through hole 25 is smaller than the through hole 24 formed in the upper surface portion of the frame portion 21. Further, the through hole 25 is smaller than the through hole 26 formed in the side surface portion of the frame portion 21. Further, the through hole 25 is smaller than the through hole 27 formed in the connecting portion 22. The number of through holes 25 is larger than the number of through holes 24 on the upper surface portion.

また、フレーム部２１の外側の側面部及び内側の側面部には、内側の空間２３に導通する貫通孔２６が形成されている。貫通孔２６は、フレーム部２１の長手方向に沿って間隔をあけて複数形成されている。各貫通孔２６は互いに同一形状である。また、貫通孔２６は、上面部に形成される貫通孔２４よりも小さく、下面部に形成される貫通孔２５よりも大きい。また、貫通孔２６は、連結部２２に形成される貫通孔２７と同等の大きさに形成される。さらに、貫通孔２６は、底板１６に形成される貫通孔２０（図１２参照）及び側壁２に形成される貫通孔８、９（図８、図９参照）よりも大きい。 Further, through holes 26 conducting through the inner space 23 are formed in the outer side surface portion and the inner side surface portion of the frame portion 21. A plurality of through holes 26 are formed at intervals along the longitudinal direction of the frame portion 21. Each through hole 26 has the same shape as each other. Further, the through hole 26 is smaller than the through hole 24 formed in the upper surface portion and larger than the through hole 25 formed in the lower surface portion. Further, the through hole 26 is formed to have the same size as the through hole 27 formed in the connecting portion 22. Further, the through hole 26 is larger than the through hole 20 (see FIG. 12) formed in the bottom plate 16 and the through holes 8 and 9 (see FIGS. 8 and 9) formed in the side wall 2.

一対のフレーム部２１は、同一高さ位置に設けられるとともに、各フレーム部２１の空間２３が、フレーム部２１（ベース１７）の短手方向に間隔をあけて並ぶように設けられる。一対の空間２３は、例えば、容器１を持ち上げたり、移動させたりするフォークリフトのつめを入れるための空間である。 The pair of frame portions 21 are provided at the same height position, and the spaces 23 of the frame portions 21 are provided so as to be arranged at intervals in the lateral direction of the frame portions 21 (base 17). The pair of spaces 23 is, for example, a space for inserting the claws of a forklift for lifting or moving the container 1.

連結部２２は、各フレーム部２１の内側の側面部に接続されている。連結部２２は、一対のフレーム部２１の間において、フレーム部２１の長手方向に間隔をあけて複数設けられる。各連結部２１は、一対のフレーム部２１の配列方向（ベース１７の短手方向）及び高さ方向（上下方向）の各幅よりも、前記各幅に直角な方向（ベース１７の長手方向）の幅が小さい板状に形成される。各連結部２２には、連結部２２の板厚方向（ベース１７の長手方向）に貫通する貫通孔２７が形成されている。１つの連結部２２当たりに、２つの貫通孔２７が形成されている。２つの貫通孔２７は、一対のフレーム部２１の配列方向に間隔をあけて形成される。貫通孔２７は、フレーム部２１の上面部に形成される貫通孔２４よりも小さく、フレーム部２１の下面部に形成される貫通孔２５よりも大きい。また、貫通孔２７は、フレーム部２１の側面部に形成される貫通孔２６と同等の大きさに形成される。さらに、貫通孔２７は、底板１６に形成される貫通孔２０（図１２参照）及び側壁２に形成される貫通孔８、９（図８、図９参照）よりも大きい。 The connecting portion 22 is connected to the inner side surface portion of each frame portion 21. A plurality of connecting portions 22 are provided between the pair of frame portions 21 at intervals in the longitudinal direction of the frame portions 21. Each connecting portion 21 is in a direction perpendicular to each width (longitudinal direction of the base 17) rather than each width in the arrangement direction (short direction of the base 17) and the height direction (vertical direction) of the pair of frame portions 21. It is formed in the shape of a plate with a small width. Each connecting portion 22 is formed with a through hole 27 penetrating in the plate thickness direction (longitudinal direction of the base 17) of the connecting portion 22. Two through holes 27 are formed per one connecting portion 22. The two through holes 27 are formed at intervals in the arrangement direction of the pair of frame portions 21. The through hole 27 is smaller than the through hole 24 formed in the upper surface portion of the frame portion 21 and larger than the through hole 25 formed in the lower surface portion of the frame portion 21. Further, the through hole 27 is formed to have the same size as the through hole 26 formed in the side surface portion of the frame portion 21. Further, the through hole 27 is larger than the through hole 20 (see FIG. 12) formed in the bottom plate 16 and the through holes 8 and 9 (see FIGS. 8 and 9) formed in the side wall 2.

上述の底板１６及びベース１７は溶接により分離不可能に一体化されている。具体的には、底板１６がベース１７の上に載っている。より具体的には、底板１６の平坦部１８ａの裏面及び底板６の起立部１９の下端が、ベース１７（一対のフレーム部２１）の上面に接触した状態となる。この状態で、平坦部１８ａとベース１７とが溶接により固定され、起立部１９の下端とベース１７とが溶接により固定されている。図５に示すように、底壁３は、平坦部１８ａとベース１７とを固定する溶接部１０４と、起立部１９の下端とベース１７とを固定する溶接部１０５とを有する。 The bottom plate 16 and the base 17 described above are inseparably integrated by welding. Specifically, the bottom plate 16 rests on the base 17. More specifically, the back surface of the flat portion 18a of the bottom plate 16 and the lower end of the upright portion 19 of the bottom plate 6 are in contact with the upper surface of the base 17 (a pair of frame portions 21). In this state, the flat portion 18a and the base 17 are fixed by welding, and the lower end of the upright portion 19 and the base 17 are fixed by welding. As shown in FIG. 5, the bottom wall 3 has a welded portion 104 for fixing the flat portion 18a and the base 17, and a welded portion 105 for fixing the lower end of the upright portion 19 and the base 17.

底壁３は、溶接により側壁２に分離不可能に固定されている。上述のように、容器１は、底壁３と側壁２とを固定する溶接部１０２、１０３を有する（図３～図５参照）。底壁３が側壁２に固定された状態では、ベース１７は側壁２の下方に露出した状態に設けられる。また、底板１６の傾斜部１８ｂは、側壁２の内側の空間（被熱処理物の収容空間）の下方を塞いだ状態に設けられる。つまり、傾斜部１８ｂが側壁２の内側の空間の底面を構成している。 The bottom wall 3 is inseparably fixed to the side wall 2 by welding. As described above, the container 1 has welds 102 and 103 for fixing the bottom wall 3 and the side wall 2 (see FIGS. 3 to 5). When the bottom wall 3 is fixed to the side wall 2, the base 17 is provided so as to be exposed below the side wall 2. Further, the inclined portion 18b of the bottom plate 16 is provided in a state of closing the lower part of the space inside the side wall 2 (the space for accommodating the heat-treated object). That is, the inclined portion 18b constitutes the bottom surface of the space inside the side wall 2.

次に、容器１の製造方法を説明する。図１４は容器１の製造方法のフローチャートの一例を示している。以下、図１４のフローチャートにしたがって、容器１の製造方法を説明する。先ず、互いに同一形状の単位壁４を準備する（Ｓ１）。具体的には、例えば、ロストワックス法で単位壁４を製造（鋳造）する。ロストワックス法では、金型にロウを流し込んで、ロウにより形成された原型を得る。原型は単位壁４の形状に形成される。次に、原型の周りを鋳砂、石膏等の耐火材でコーティング（被覆）する。次に、耐火材及びその内側の原型（ロウ）を加熱して、内側の原型（ロウ）を溶かし出して除去する。これにより、耐火材の内側に、単位壁４の形状に相当する空洞が形成される。この空洞を有した耐火材を鋳型として、次に、この空洞に金属を流し込んで、流し込んだ金属を硬化させた後、周りの耐火材を破壊により除去する。以上により、単位壁４が得られる。この作業を４回行うことで、互いに同一形状の４つの単位壁４が得られる。なお、ステップＳ１が本開示の鋳造工程に相当する。 Next, a method for manufacturing the container 1 will be described. FIG. 14 shows an example of a flowchart of the manufacturing method of the container 1. Hereinafter, a method for manufacturing the container 1 will be described according to the flowchart of FIG. First, unit walls 4 having the same shape are prepared (S1). Specifically, for example, the unit wall 4 is manufactured (cast) by the lost wax method. In the lost wax method, wax is poured into a mold to obtain a prototype formed by the wax. The prototype is formed in the shape of the unit wall 4. Next, the periphery of the prototype is coated with a refractory material such as cast sand or plaster. Next, the refractory material and the prototype (row) inside the refractory material are heated to melt and remove the prototype (row) inside. As a result, a cavity corresponding to the shape of the unit wall 4 is formed inside the refractory material. Using the refractory material having this cavity as a mold, metal is then poured into this cavity to cure the poured metal, and then the surrounding refractory material is removed by destruction. From the above, the unit wall 4 is obtained. By performing this operation four times, four unit walls 4 having the same shape can be obtained. Note that step S1 corresponds to the casting process of the present disclosure.

また、底板１６及びベース１７を、例えば、ロストワックス法で製造（鋳造）する（Ｓ２、Ｓ３）。なお、単位壁４、底板１６、及びベース１７は互いに同一種類の鋼材で形成してもよいし、異なる種類の鋼材で形成してもよい。また、単位壁４の準備（Ｓ１）、底板１６の準備（Ｓ２）、及びベース１７の準備（Ｓ３）はどの順番で行ってもよい。 Further, the bottom plate 16 and the base 17 are manufactured (cast) by, for example, a lost wax method (S2, S3). The unit wall 4, the bottom plate 16, and the base 17 may be formed of the same type of steel material or different types of steel material. Further, the preparation of the unit wall 4 (S1), the preparation of the bottom plate 16 (S2), and the preparation of the base 17 (S3) may be performed in any order.

次に、ステップＳ１で準備した４つの単位壁４を互いに溶接することで、上方及び下方に長方形開口を有した側壁２を形成する（Ｓ４）。このとき、４つの単位壁４を側壁２の形状となるよう治具で固定した状態にし、この状態で単位壁４同士を溶接すればよい。溶接はアーク溶接等の融接としてよい。また、ステップＳ４では、溶接後の側壁２の形状を微調整できるように、単位壁４同士を仮溶接してよい。仮溶接では、溶接箇所又は溶接範囲を、容器１の完成時の状態よりも少なくすればよい。また、ステップＳ４では、側壁２へのピン１５の固定は未だ行わないとしてよい。 Next, the four unit walls 4 prepared in step S1 are welded to each other to form a side wall 2 having rectangular openings above and below (S4). At this time, the four unit walls 4 may be fixed with a jig so as to have the shape of the side wall 2, and the unit walls 4 may be welded to each other in this state. Welding may be fusion welding such as arc welding. Further, in step S4, the unit walls 4 may be temporarily welded to each other so that the shape of the side wall 2 after welding can be finely adjusted. In temporary welding, the welding location or welding range may be smaller than the state when the container 1 is completed. Further, in step S4, the pin 15 may not be fixed to the side wall 2 yet.

また、ステップＳ２、Ｓ３で準備した底板１６及びベース１７を互いに溶接することで、底壁３を形成する（Ｓ５）。このとき、底板１６及びベース１７を底壁３の形状（ベース１７の上に底板１６が載った形状）となるよう治具で固定した状態にし、この状態で底板１６及びベース１７を溶接すればよい。溶接はアーク溶接等の融接としてよい。また、ステップＳ５では、溶接後の底壁３の形状を微調整できるように、底板１６及びベース１７を仮溶接してよい。なお、ステップＳ４の側壁２の形成と、ステップＳ５の底壁３の形成とはどの順番で行ってもよい。 Further, the bottom wall 3 is formed by welding the bottom plate 16 and the base 17 prepared in steps S2 and S3 to each other (S5). At this time, if the bottom plate 16 and the base 17 are fixed with a jig so as to have the shape of the bottom wall 3 (the shape in which the bottom plate 16 is placed on the base 17), and the bottom plate 16 and the base 17 are welded in this state. good. Welding may be fusion welding such as arc welding. Further, in step S5, the bottom plate 16 and the base 17 may be temporarily welded so that the shape of the bottom wall 3 after welding can be finely adjusted. The formation of the side wall 2 in step S4 and the formation of the bottom wall 3 in step S5 may be performed in any order.

次に、ステップＳ４で得た側壁２と、ステップＳ５で得た底壁３とを溶接により合体させる（Ｓ６）。このとき、側壁２及び底壁３を容器１の形状（側壁２の下方を底壁３で塞いだ形状）となるよう治具で固定した状態にし、この状態で側壁２（各単位壁４）及び底壁３を溶接すればよい。溶接はアーク溶接等の融接としてよい。 Next, the side wall 2 obtained in step S4 and the bottom wall 3 obtained in step S5 are combined by welding (S6). At this time, the side wall 2 and the bottom wall 3 are fixed with a jig so as to have the shape of the container 1 (the shape in which the lower part of the side wall 2 is closed by the bottom wall 3), and in this state, the side wall 2 (each unit wall 4). And the bottom wall 3 may be welded. Welding may be fusion welding such as arc welding.

また、ステップＳ６では、単位壁４同士の溶接箇所又は溶接範囲を追加することで、単位壁４同士の本溶接を行ってよい。言い換えれば、単位壁４同士の固定を強化してよい。また、底板１６とベース１７との溶接箇所又は溶接範囲を追加することで、底板１６及びベース１７の本溶接を行ってよい。言い換えれば、底板１６及びベース１７の固定を強化してよい。また、ステップＳ６では、側壁２と底壁３とを先ず仮溶接し、その後、本溶接してよい。なお、ステップＳ４～Ｓ６が本開示の溶接工程に相当する。 Further, in step S6, the main welding of the unit walls 4 may be performed by adding a welding portion or a welding range between the unit walls 4. In other words, the fixation between the unit walls 4 may be strengthened. Further, the main welding of the bottom plate 16 and the base 17 may be performed by adding a welding point or a welding range between the bottom plate 16 and the base 17. In other words, the fixing of the bottom plate 16 and the base 17 may be strengthened. Further, in step S6, the side wall 2 and the bottom wall 3 may be temporarily welded first and then main welded. In addition, steps S4 to S6 correspond to the welding process of this disclosure.

また、側壁２と底壁３とを合体させる際には、図１１に示すように単位壁４同士をピン１５で固定する（Ｓ７）。具体的には、隣り合う一方の単位壁４の突合せ部１１に形成された貫通孔１２と、他方の単位壁４の突合せ部１１に形成された貫通孔１２とを貫通するようにピン１５を挿通させる。その後、ピン１５の一方の端部と一方の突合せ部１１とを溶接し、ピン１５の他方の端部と他方の突合せ部１１とを溶接する。溶接はアーク溶接等の融接としてよい。なお、ステップＳ７が本開示のピン固定工程に相当する。以上により、容器１が得られる。 Further, when the side wall 2 and the bottom wall 3 are combined, the unit walls 4 are fixed to each other by pins 15 as shown in FIG. 11 (S7). Specifically, the pin 15 is inserted so as to penetrate the through hole 12 formed in the butt portion 11 of one of the adjacent unit walls 4 and the through hole 12 formed in the butt portion 11 of the other unit wall 4. Let it be inserted. After that, one end of the pin 15 and one butt portion 11 are welded, and the other end of the pin 15 and the other butt portion 11 are welded. Welding may be fusion welding such as arc welding. Note that step S7 corresponds to the pin fixing step of the present disclosure. From the above, the container 1 is obtained.

以下、本実施形態の効果を説明する。本実施形態では、容器１が鋳造製なので、プレス加工製に比べて、容器１を製造するための金型のコストを抑えることができる。すなわち、プレス加工の金型は、鋼材に強い力を加えて鋼材を変形させるために、破損しやすい。破損しないようにするために、金型を頑丈に作る必要がある。また、破損した場合には、新たに金型を作る必要がある。これに対して、鋳造の金型は、鋼材に強い力を加える必要がないため、プレス加工の金型に比べて破損しにくい。 Hereinafter, the effects of this embodiment will be described. In the present embodiment, since the container 1 is made of casting, the cost of the mold for manufacturing the container 1 can be suppressed as compared with the case of pressing. That is, the press-processed die is easily damaged because the steel material is deformed by applying a strong force to the steel material. The mold needs to be made sturdy to prevent it from being damaged. If it is damaged, it is necessary to make a new mold. On the other hand, a casting die does not need to apply a strong force to a steel material, so that it is less likely to be damaged than a press die.

また、容器１を構成する各部材４、１６、１７は精密鋳造法の一つであるロストワックス法で製造されるので、各部材４、１６、１７を精密に形成できる。これにより、各部材４、１６、１７を組み立てる際に、部材４、１６、１７間で接合箇所がずれてしまうのを抑制でき、部材４、１６、１７間の溶接をしやすくできる。また、正確な形状の容器１を得ることができる。また、隣り合う単位壁４間で、ピン１５を挿通させるための貫通孔１２の位置がずれてしまうのを抑制でき、単位壁４同士のピン１５による固定をしやすくできる。 Further, since the members 4, 16 and 17 constituting the container 1 are manufactured by the lost wax method, which is one of the precision casting methods, the members 4, 16 and 17 can be precisely formed. As a result, when assembling the members 4, 16 and 17, it is possible to prevent the joints from being displaced between the members 4, 16 and 17, and it is possible to facilitate welding between the members 4, 16 and 17. In addition, a container 1 having an accurate shape can be obtained. Further, it is possible to prevent the position of the through hole 12 for inserting the pin 15 from being displaced between the adjacent unit walls 4, and it is possible to easily fix the unit walls 4 to each other by the pin 15.

また、側壁２は複数（４つ）の単位壁４の組み合わせで構成されるので、容器１の容積を大きくできる。また、単位壁４の１つ当たりの大きさを抑制できる。これにより、単位壁４を製造するための設備（型など）が大型化するのを抑制でき、該設備のコストを低減できる。また、単位壁４の大きさを抑えることで、単位壁４を鋳造で製造したときに、単位壁４の形状誤差を小さくできる。 Further, since the side wall 2 is composed of a combination of a plurality (4) unit walls 4, the volume of the container 1 can be increased. In addition, the size of each unit wall 4 can be suppressed. As a result, it is possible to suppress an increase in the size of equipment (mold, etc.) for manufacturing the unit wall 4, and it is possible to reduce the cost of the equipment. Further, by suppressing the size of the unit wall 4, the shape error of the unit wall 4 can be reduced when the unit wall 4 is manufactured by casting.

また、各単位壁４は互いに同一形状なので、単位壁４を製造するための型（ロストワックス法によるロウの原型を作るための金型）として、全ての単位壁４の間で共通の型を使用できる。これにより、型のコストを低減でき、ひいては、容器１の製造コストを低減できる。 Further, since each unit wall 4 has the same shape as each other, a common mold is used among all the unit walls 4 as a mold for manufacturing the unit wall 4 (a mold for making a wax prototype by the lost wax method). Can be used. As a result, the cost of the mold can be reduced, and by extension, the manufacturing cost of the container 1 can be reduced.

また、単位壁４は上下対称形なので、各単位壁４を、図２の左上の単位壁４Ａとして用いることもできるし、右上の単位壁４Ｂとして用いることもできるし、右下の単位壁４Ｃとして用いることもできるし、左下の単位壁４Ｄとして用いることもできる。 Further, since the unit wall 4 has a vertically symmetrical shape, each unit wall 4 can be used as the upper left unit wall 4A in FIG. 2, the upper right unit wall 4B, or the lower right unit wall 4C. It can also be used as a unit wall 4D at the lower left.

また、各単位壁４は側壁２の角部５ｃを含んでおり、言い換えれば、角部５ｃ以外の位置で分割された形状なので、角部５ｃ以外の位置で単位壁４同士を溶接できる。これにより、その溶接をしやすくできる。また、単位壁４が角部５ｃを含む形状なので、円弧状の角部５ｃを容易に形成できる。これにより、角部５ｃに熱応力が集中するのを抑制でき、角部５ｃが熱変形で破損するのを抑制できる。また、角部５ｃには溶接部が存在しないので、角部５ｃが熱変形で破損するのを抑制できる。 Further, each unit wall 4 includes a corner portion 5c of the side wall 2, in other words, since the shape is divided at a position other than the corner portion 5c, the unit walls 4 can be welded to each other at a position other than the corner portion 5c. This makes it easier to weld. Further, since the unit wall 4 has a shape including the corner portion 5c, the arcuate corner portion 5c can be easily formed. As a result, it is possible to suppress the concentration of thermal stress on the corner portion 5c, and it is possible to suppress the corner portion 5c from being damaged by thermal deformation. Further, since the corner portion 5c does not have a welded portion, it is possible to prevent the corner portion 5c from being damaged by thermal deformation.

また、各単位壁４は突合せ部１１同士の溶接に加えて、ピン１５による固定もなされるので、側壁２が仮に熱変形したとしても、単位壁４同士の溶接部１００が切れて、単位壁４同士が分離されてしまうのを抑制できる。 Further, since each unit wall 4 is fixed by a pin 15 in addition to welding the butt portions 11, even if the side wall 2 is thermally deformed, the welded portion 100 between the unit walls 4 is cut and the unit wall is cut. It is possible to prevent the four from being separated from each other.

さらに、側壁２（単位壁４）の縦断面が波形状なので、側壁２の剛性を高くできる。これにより、側壁２の熱変形を抑制できる。その波形状は、側壁２の横断面（側壁２を水平面で切断した断面）ではなく、縦断面（水平面に直角な垂直面で側壁２を切断した断面）に形成されるので、単位壁４同士を分離させようとする（単位壁４同士の溶接部１００を切断しようとする）方向への側壁２の変形（図２の破線部２００で示される変形）を抑制できる。これにより、溶接部１００が切れてしまうのを抑制できる。 Further, since the vertical cross section of the side wall 2 (unit wall 4) has a wavy shape, the rigidity of the side wall 2 can be increased. As a result, thermal deformation of the side wall 2 can be suppressed. Since the wave shape is formed not in the cross section of the side wall 2 (the cross section of the side wall 2 cut in the horizontal plane) but in the vertical cross section (the cross section of the side wall 2 cut in the vertical plane perpendicular to the horizontal plane), the unit walls 4 are formed with each other. It is possible to suppress the deformation of the side wall 2 (deformation shown by the broken line portion 200 in FIG. 2) in the direction of trying to separate the wall 4 (trying to cut the welded portion 100 between the unit walls 4). As a result, it is possible to prevent the welded portion 100 from being cut off.

また、側壁２（単位壁４）は横方向及び縦方向に複数のリブ１３、１４を有するので、側壁２の剛性を高くできる。これにより、側壁２の熱変形を抑制できる。 Further, since the side wall 2 (unit wall 4) has a plurality of ribs 13 and 14 in the horizontal direction and the vertical direction, the rigidity of the side wall 2 can be increased. As a result, thermal deformation of the side wall 2 can be suppressed.

また、側壁２には全周に亘って複数の貫通孔８、９が形成され、その周方向の貫通孔８、９の配列が上下方向に複数列形成されるので、熱処理の際に、容器１内に熱風を効率的に導入でき、ひいては被熱処理物に対する熱処理を効率的に行うことができる。 Further, since a plurality of through holes 8 and 9 are formed on the side wall 2 over the entire circumference and a plurality of rows of through holes 8 and 9 in the circumferential direction are formed in the vertical direction, the container is formed during heat treatment. Hot air can be efficiently introduced into 1 and heat treatment for the object to be heat-treated can be efficiently performed.

さらに、側壁２の貫通孔８は、波形状を構成する盛上部７に形成されるので、容器１内に入れられる被熱処理物で貫通孔８が塞がれてしまうのを抑制できる。特に、貫通孔８は、盛上部７の中で最も外側に位置する頂点部７ａに形成されるので、被熱処理物で貫通孔８が塞がれてしまうのをより一層抑制できる。これにより、熱処理の際に、外からの熱風を容器１内の各領域に流通させやすくできる。 Further, since the through hole 8 of the side wall 2 is formed in the raised portion 7 forming the wave shape, it is possible to prevent the through hole 8 from being blocked by the heat-treated material put in the container 1. In particular, since the through hole 8 is formed at the apex portion 7a located on the outermost side of the raised portion 7, it is possible to further prevent the through hole 8 from being blocked by the heat-treated object. This makes it possible to easily distribute hot air from the outside to each region in the container 1 during the heat treatment.

また、底壁３（底板１６及びベース１７）にも貫通孔２０、２４～２７が形成されるので、熱処理の際に、容器１内に熱風を効率的に導入でき、ひいては被熱処理物に対する熱処理を効率的に行うことができる。特に、ベース１７のフレーム部２１の上面部、側面部、及び下面部にそれぞれ貫通孔２４～２６が形成され、さらに連結部２２にも貫通孔２７が形成されるので、より一層、容器１内に熱風を効率的に導入できる。 Further, since the through holes 20, 24 to 27 are also formed in the bottom wall 3 (bottom plate 16 and base 17), hot air can be efficiently introduced into the container 1 during the heat treatment, and the heat treatment for the heat-treated object can be performed. Can be done efficiently. In particular, through holes 24 to 26 are formed in the upper surface portion, the side surface portion, and the lower surface portion of the frame portion 21 of the base 17, respectively, and the through holes 27 are also formed in the connecting portion 22, so that the inside of the container 1 is further formed. Hot air can be introduced efficiently.

なお、本開示は上記実施形態に限定されず種々の変更が可能である。例えば上記実施形態では、平面視で見て、長手方向及び短手方向を有した長方形の熱処理用容器を示したが、平面視で見た形状が正方形の熱処理用容器であってもよい。 The present disclosure is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, a rectangular heat treatment container having a longitudinal direction and a lateral direction is shown in a plan view, but a heat treatment container having a square shape in a plan view may be used.

また、上記実施形態では、側壁が４つに等分割された例を示したが、２つに等分割されてもよい。また、側壁を構成する複数の単位壁のそれぞれが、他の少なくとも１つの単位壁と同一形状に形成されるのであれば、側壁は４つ、又は２つ以外の個数（３つ、又は５つ以上）に分割されてもよい。 Further, in the above embodiment, the example in which the side wall is equally divided into four is shown, but the side wall may be equally divided into two. Further, if each of the plurality of unit walls constituting the side wall is formed in the same shape as at least one other unit wall, the number of side walls is four or a number other than two (three or five). It may be divided into the above).

また、上記実施形態では、側壁が、平面視で長方形を構成する各辺の中点位置で分割された例を示したが、側壁を構成する複数の単位壁のそれぞれが、他の少なくとも１つの単位壁と同一形状に形成されるのであれば、各辺の中点位置以外の位置で分割されてもよい。 Further, in the above embodiment, the example in which the side wall is divided at the midpoint position of each side constituting the rectangle in a plan view is shown, but each of the plurality of unit walls constituting the side wall is at least one other. As long as it is formed in the same shape as the unit wall, it may be divided at a position other than the midpoint position of each side.

また、側壁に貫通孔が形成されないとしてもよい。また、底壁（底板、ベース）に貫通孔が形成されないとしてもよい。 Further, the through hole may not be formed on the side wall. Further, it may not be necessary to form a through hole in the bottom wall (bottom plate, base).

また、上記実施形態では、単位壁、底板、及びベースがロストワックス法で形成される例を示したが、他の鋳造法で形成されてもよい。 Further, in the above embodiment, the unit wall, the bottom plate, and the base are formed by the lost wax method, but they may be formed by another casting method.

単位壁同士を固定するピンは、側壁と底壁とを合体させる前に予め側壁に固定されてもよい。すなわち、図１４のステップＳ４でピン固定を行ってもよい。 The pin for fixing the unit walls may be fixed to the side wall in advance before the side wall and the bottom wall are combined. That is, the pin may be fixed in step S4 of FIG.

１ 熱処理用容器
２ 側壁
３ 底壁
４ 単位壁
1 Heat treatment container 2 Side wall 3 Bottom wall 4 Unit wall

Claims (7)

上方が開口し、四方を囲む側壁と下方を塞ぐ底壁とを有する直方体形状であり、
前記側壁は鋳造製であり、
前記側壁は、上方に、長手方向と、それに直交する短手方向とを有した長方形の開口を形成するように設けられ、
前記側壁は、前記側壁の周方向に沿った位置のうち前記側壁の角部以外の位置であって前記長方形を構成する各辺の中点の位置で分割された４つの単位壁で構成されており、
４つの前記単位壁のそれぞれが隣りの前記単位壁に溶接され、かつ、前記底壁に溶接されており、
４つの前記単位壁は互いに同一形状に形成されており、
前記単位壁は、平面視で見て第１方向に延びた第１部分と、前記第１方向に直角な第２方向に延びた第２部分とを有し、前記第１部分の前記第１方向における長さは前記第２部分の前記第２方向における長さよりも長いＬ字形状に形成され、かつ、上下対称形である、
熱処理用容器。 It is a rectangular parallelepiped shape with an opening at the top and a side wall surrounding all four sides and a bottom wall blocking the bottom.
The side wall is made of casting
The side wall is provided above to form a rectangular opening having a longitudinal direction and a lateral direction orthogonal to it.
The side wall is composed of four unit walls divided at positions other than the corners of the side wall and at the midpoint of each side constituting the rectangle among the positions along the circumferential direction of the side wall. Ori,
Each of the four unit walls is welded to the adjacent unit wall and welded to the bottom wall.
The four unit walls are formed in the same shape as each other.
The unit wall has a first portion extending in a first direction and a second portion extending in a second direction perpendicular to the first direction in a plan view, and the first portion of the first portion. The length in the direction is formed in an L-shape longer than the length of the second portion in the second direction, and is vertically symmetrical.
Heat treatment container. 前記単位壁は、隣りの前記単位壁と突き合わさる突合せ部を有し、
隣り合う一方の前記単位壁の前記突合せ部と他方の前記単位壁の前記突合せ部とを貫通するとともに両方の前記突合せ部に溶接されたピンを備え、
前記ピンの溶接部とは別に、隣り合う前記単位壁同士の前記突合せ部の位置に溶接部が上下方向に沿って形成される請求項１に記載の熱処理用容器。 The unit wall has a butt portion that abuts against the adjacent unit wall.
A pin that penetrates the butt portion of one of the adjacent unit walls and the butt portion of the other unit wall and is welded to both of the butt portions is provided .
The heat treatment container according to claim 1, wherein a welded portion is formed along the vertical direction at a position of the butted portion between adjacent unit walls separately from the welded portion of the pin . 前記側壁の縦断面が波形状であり、
前記波形状における外側に盛り上がった盛上部には、前記側壁の周方向に沿って複数の貫通孔が形成される請求項１又は２に記載の熱処理用容器。 The vertical cross section of the side wall is corrugated.
The heat treatment container according to claim 1 or 2, wherein a plurality of through holes are formed along the circumferential direction of the side wall on the raised portion that rises outward in the wavy shape. 前記波形状は上下方向に沿って複数の前記盛上部を有し、 The wave shape has a plurality of the ridges along the vertical direction.
前記盛上部は、水平方向外側に最も突出した頂点部と、前記頂点部から上方に向かうにしたがって徐々に内側に変位する第１傾斜部と、前記頂点部から下方に向かうにしたがって徐々に内側に変位する第２傾斜部とを有し、 The ridge is the apex portion that protrudes most outward in the horizontal direction, the first inclined portion that gradually displaces inward as it goes upward from the apex portion, and the apex portion that gradually inward as it goes downward from the apex portion. It has a second inclined portion that is displaced and has a second inclined portion.
前記盛上部の前記貫通孔は前記頂点部に形成される請求項３に記載の熱処理用容器。 The heat treatment container according to claim 3, wherein the through hole on the ridge is formed at the apex. 前記盛上部の上下両側に位置する谷部には、前記単位壁の水平延設方向に沿って線状に延びた横リブが形成されており、 Horizontal ribs extending linearly along the horizontal extension direction of the unit wall are formed in the valleys located on both the upper and lower sides of the ridge.
前記横リブに交差するように、かつ、前記頂点部には交差しないように、上下方向に線状に延びた縦リブが上下方向に断続的に形成される請求項４に記載の熱処理用容器。 The heat treatment container according to claim 4, wherein vertical ribs extending linearly in the vertical direction are intermittently formed in the vertical direction so as to intersect the horizontal ribs and not to intersect the apex portion. .. 請求項１～５のいずれか１項に記載の熱処理用容器の製造方法であって、
前記単位壁を鋳造により形成する鋳造工程であり、その鋳造に使用する型が全ての前記単位壁の間で共通の型である鋳造工程と、
４つの前記単位壁及び前記底壁を溶接により一体化する溶接工程と、
を備える熱処理用容器の製造方法。 The method for manufacturing a heat treatment container according to any one of claims 1 to 5 .
A casting process in which the unit wall is formed by casting, and the mold used for the casting is a common mold among all the unit walls .
A welding process in which the four unit walls and the bottom wall are integrated by welding,
A method for manufacturing a heat treatment container. 前記単位壁同士の突合せ部にピンを貫通させて、前記ピンを前記突合せ部に溶接するピン固定工程を備える請求項６に記載の熱処理用容器の製造方法。 The method for manufacturing a heat treatment container according to claim 6 , further comprising a pin fixing step of penetrating a pin through a butt portion between the unit walls and welding the pin to the butt portion.
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JP2004043917A (en) 2002-07-15 2004-02-12 Taiheiyo Tokushu Chuzo Kk Heat treatment fixture made by casting

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US20020084274A1 (en) 2000-01-31 2002-07-04 Dolav Dvir Lahav Plastic Products Square knock-down bin
JP2004043917A (en) 2002-07-15 2004-02-12 Taiheiyo Tokushu Chuzo Kk Heat treatment fixture made by casting

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