JP5012545B2 - Manufacturing method of piping members - Google Patents

Manufacturing method of piping members Download PDF

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JP5012545B2
JP5012545B2 JP2008025762A JP2008025762A JP5012545B2 JP 5012545 B2 JP5012545 B2 JP 5012545B2 JP 2008025762 A JP2008025762 A JP 2008025762A JP 2008025762 A JP2008025762 A JP 2008025762A JP 5012545 B2 JP5012545 B2 JP 5012545B2
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cylindrical
manufacturing
hot water
piping member
plate
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JP2009183971A (en
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直 橋本
和哉 原口
滋彦 松岡
智也 平野
功 大上
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Daikin Industries Ltd
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Description

本発明は、円筒部及び前記円筒部の一端から径方向外方に延びる鍔部(flange)が一体となっている配管部材の製造方法に関する。   The present invention relates to a method of manufacturing a piping member in which a cylindrical portion and a flange extending radially outward from one end of the cylindrical portion are integrated.

近年、ヒートポンプで大気中から熱を集め、その熱で沸かした湯をタンクに溜めておき、そのタンクから給湯を行う給湯システムが出現している(例えば、特許文献1参照)。タンクには、給湯用配管、給水用配管、ヒートポンプと接続される配管など、水や湯が通る多数の配管が接続されている。この配管接続のために、タンクには、管座と呼ばれる配管部材が溶接される。   In recent years, a hot water supply system has emerged that collects heat from the atmosphere with a heat pump, stores hot water boiled with the heat in a tank, and supplies hot water from the tank (see, for example, Patent Document 1). A number of pipes through which water and hot water pass are connected to the tank, such as pipes for hot water supply, pipes for water supply, and pipes connected to a heat pump. For this pipe connection, a pipe member called a pipe seat is welded to the tank.

図10に示すように、タンクの管座溶接平面部31aには、タンクの内部に向けて折り曲げられた円筒部31bおよび円筒部31bに囲まれる孔が形成されている。この円筒部31bの内周面と接するように、配管部材(管座)260の先端薄肉円筒部262が孔に嵌め込まれ、タンクの円筒部31bの端部と配管部材260の先端薄肉円筒部262の端部とが全周溶接される。一方、配管部材260には、先端薄肉円筒部262と反対側の部分に、鍔部263が形成されている。この鍔部263は、クイックファスナー(ばね特性を生かした配管継ぎ手部材)190によって、水や湯が通る別の配管180の鍔部181に連結される。配管180の鍔部181の内周部から軸方向に突出する先端円筒部182は、配管部材260の内部空間に入り込み、配管部材260の内周面261aとシール部材170を介して密着する。これにより、配管部材260を介してタンクから配管180に(或いは配管180からタンクに)流れる水や湯が外部に漏れないようになっている。
特開2007−285655号公報
As shown in FIG. 10, a cylindrical portion 31 b that is bent toward the inside of the tank and a hole that is surrounded by the cylindrical portion 31 b are formed in the tube seat weld plane portion 31 a of the tank. The thin-walled cylindrical portion 262 of the pipe member (tube seat) 260 is fitted into the hole so as to contact the inner peripheral surface of the cylindrical portion 31b, and the end of the cylindrical portion 31b of the tank and the thin-walled cylindrical portion 262 of the pipe member 260 are fitted. Are welded all around. On the other hand, a flange portion 263 is formed on the pipe member 260 at a portion on the opposite side of the thin-walled cylindrical portion 262 at the tip. The flange portion 263 is connected to a flange portion 181 of another pipe 180 through which water or hot water passes by a quick fastener 190 (a pipe joint member utilizing spring characteristics). The tip cylindrical portion 182 that protrudes in the axial direction from the inner peripheral portion of the flange portion 181 of the pipe 180 enters the internal space of the pipe member 260 and is in close contact with the inner peripheral surface 261 a of the pipe member 260 via the seal member 170. Thus, water and hot water flowing from the tank to the pipe 180 (or from the pipe 180 to the tank) via the pipe member 260 are prevented from leaking to the outside.
JP 2007-285655 A

上述の配管部材260は、耐応力腐食割れ性に優れたSUS444相当のフェライト系ステンレス鋼から作られることが多く、且つ、市販品のクイックファスナーを利用して別の配管180と接続しようとした場合、その形状(特に、鍔部263の形状)に高精度が要求される。このため、従来は、厚肉円筒状の素材に機械加工(切削加工など)を施して配管部材260を製造している。   The above-mentioned piping member 260 is often made of ferritic stainless steel equivalent to SUS444 having excellent stress corrosion cracking resistance, and when trying to connect to another piping 180 using a commercially available quick fastener The shape (particularly the shape of the flange 263) is required to have high accuracy. For this reason, conventionally, the piping member 260 is manufactured by subjecting a thick-walled cylindrical material to machining (cutting or the like).

しかし、機械加工による製造では、配管部材260の製造時間が長く且つ製造コストも高くなってしまう。   However, in manufacturing by machining, the manufacturing time of the piping member 260 is long and the manufacturing cost is high.

本発明の課題は、配管部材を、より安価により早く製造することにある。   An object of the present invention is to manufacture a piping member earlier at a lower cost.

第1発明に係る配管部材の製造方法は、円筒部及びその円筒部の一端から径方向外方に延びる鍔部が一体となっている配管部材の製造方法であって、第1ステップと、第2ステップとを備えている。第1ステップでは、板状素材を、プレス成形によって、円筒状の第1部を含む初期形状に成形する。第2ステップでは、第1ステップによって初期形状となった成形中間材の第1部の端部近傍部分を湾曲させて径方向外方に延ばし、第1部を円筒部及び鍔部に成形する。第2ステップは、1又は複数のプレス成形工程から成っている。第2ステップは、第3部を水平方向に近づくようにプレス成形する工程と、水平方向に近づいた第3部が途中で上を向くように第3部の先端側の部分を逆側に湾曲させる工程と、上を向いた第3部の先端が水平方向に近づくように第3部の先端部分を外方に曲げる工程と、を含む。第2ステップでは、第3部に段差を形成することにより、第3部において、円筒部の軸方向に段ができ、且つ、円筒部の径方向にも段ができる。 A pipe member manufacturing method according to a first aspect of the present invention is a pipe member manufacturing method in which a cylindrical portion and a flange portion extending radially outward from one end of the cylindrical portion are integrated, the first step, 2 steps. In the first step, the plate-shaped material is formed into an initial shape including a cylindrical first portion by press molding. In the second step, the vicinity of the end portion of the first part of the forming intermediate material having the initial shape by the first step is curved and extended outward in the radial direction, and the first part is formed into a cylindrical part and a flange part. The second step consists of one or more press forming processes. The second step is a step of pressing the third part so as to approach the horizontal direction, and the tip part of the third part is bent to the opposite side so that the third part approaching the horizontal direction faces upward in the middle. And a step of bending the tip portion of the third part outward so that the tip of the third part facing upward approaches the horizontal direction. In the second step, by forming a step in the third part, a step can be formed in the third part in the axial direction of the cylindrical part and also in the radial direction of the cylindrical part.

通常、円筒部と鍔部とから成る部材をプレス成形を使って製造する場合、鍔部を含む最終形状或いはその最終形状に近い形状になるように素材に対してプレス成形を施すが、そのような製造方法の場合、素材が硬かったり分厚かったりすると、うまくプレス成形を行うことが難しい。たとえプレス成形の設備を大型化しても、プレス成形をかけた素材が損傷する割合が大きくなる。   Normally, when a member consisting of a cylindrical part and a collar part is manufactured using press molding, the material is press-molded so as to have a final shape including the collar part or a shape close to the final shape. In the case of a simple manufacturing method, if the material is hard or thick, it is difficult to perform press molding well. Even if the equipment for press molding is enlarged, the rate of damage to the material subjected to press molding increases.

これに対し、第1発明では、まず第1ステップで円筒状の第1部を含む初期形状になるようにプレス成形を施し、その次の第2ステップにおいて、円筒状の第1部の端部近傍部分を湾曲させるプレス成形を施し、第1部を円筒部及び鍔部に成形する。このため、少なくとも2回のプレス成形が必要にはなるが、第1ステップにおいても第2ステップにおいても、プレス成形による素材の損傷が抑えられ、歩留まりがよい配管部材の製造が実現できる。また、このような製造方法を採ることで、プレス成形による配管部材の製造が実現できるため、従来の機械加工による配管部材の製造方法に較べ、その製造時間が短縮化される。   On the other hand, in the first invention, first, press forming is performed so that the initial shape including the cylindrical first part is formed in the first step, and in the next second step, the end of the cylindrical first part is formed. Press molding is performed to curve the vicinity, and the first part is molded into the cylindrical part and the collar part. For this reason, at least two press moldings are required, but in both the first step and the second step, damage to the material due to press molding can be suppressed, and manufacture of a piping member with a high yield can be realized. Further, by adopting such a manufacturing method, manufacturing of the piping member by press molding can be realized, so that the manufacturing time is shortened as compared with the conventional manufacturing method of the piping member by machining.

このように、第1発明によれば、より安価により早く配管部材を製造することができる。   Thus, according to the first invention, the piping member can be manufactured more quickly at a lower cost.

また、複数のプレス成形工程によって、円筒状の第1部を円筒部及び鍔部に成形していくため、鍔部が複雑な形状である場合にも、素材の損傷を回避しながら鍔部を精度よく成形することができる。例えば、鍔部が段差を含む形状である場合にも、その形状を精度よく出すことができる。 In addition, since the cylindrical first part is formed into a cylindrical part and a collar part by a plurality of press molding processes, the collar part can be removed while avoiding damage to the material even when the collar part has a complicated shape. It can be molded with high accuracy. For example, even when the collar portion has a shape including a step, the shape can be accurately obtained.

第2発明に係る配管部材の製造方法は、第1発明の製造方法であって、第2ステップの後に行われる第3ステップをさらに備えている。第1ステップでは、板状素材を、第1部及び円盤状の底部を含み且つ断面が凹状の初期形状に成形する。第3ステップでは、底部の中央部分を切り離す。 The manufacturing method of the piping member according to the second invention is the manufacturing method of the first invention , and further includes a third step performed after the second step. In the first step, the plate-like material is formed into an initial shape including a first part and a disk-like bottom part and having a concave cross section. In the third step, the central part of the bottom is cut off.

第3発明では、断面が凹状の、言い換えれば、グラス(glass)状の初期形状になるように板状素材をプレス成形し、その後の第2ステップで、底部と反対側の第1部の端部近傍部分を径方向外方に延ばし、第3ステップで底部の中央部分を切り離すことで、円筒部及び鍔部から成る配管部材を製造する。このように、第1ステップで成形する初期形状が底部を含むグラス状であることから、第1ステップにおける板状素材からのプレス成形が、無理なく良好に行われるようになる。   In the third invention, the plate-shaped material is press-molded so as to have a concave cross-section, in other words, a glass-like initial shape, and in the second step thereafter, the end of the first part opposite to the bottom part A pipe member composed of a cylindrical portion and a flange portion is manufactured by extending a portion near the portion outward in the radial direction and cutting off the central portion of the bottom portion in the third step. Thus, since the initial shape formed in the first step is a glass shape including the bottom, press forming from the plate-like material in the first step is performed reasonably and satisfactorily.

第3発明に係る配管部材の製造方法は、第1又は第2発明の製造方法であって、板状素材が、クロム(Cr)含有量が17〜20%、モリブデン(Mo)含有量が1.7〜2.5%、炭素(C)含有量が0.03以下のフェライト系ステンレス鋼である。 The manufacturing method of the piping member according to the third invention is the manufacturing method of the first or second invention , wherein the plate-shaped material has a chromium (Cr) content of 17 to 20% and a molybdenum (Mo) content of 1. Ferritic stainless steel having a carbon (C) content of 0.03 or less.

このような組成の板状素材を用いた場合にも、第1又は第2発明の製造方法によれば、プレス成形によって円筒部及び鍔部から成る配管部材を歩留まりよく製造することができる。 Even when a plate-shaped material having such a composition is used, according to the manufacturing method of the first or second invention, a piping member composed of a cylindrical portion and a flange portion can be manufactured with high yield by press molding.

第4発明に係る配管部材の製造方法は、第3発明の製造方法であって、板状素材として、2mm以下の厚みの素材を用いる。 The manufacturing method of the piping member according to the fourth invention is the manufacturing method of the third invention , wherein a material having a thickness of 2 mm or less is used as the plate-shaped material.

第3発明の製造方法であれば、プレス成形によって円筒部及び鍔部から成る配管部材を製造することが可能であるが、素材の損傷回避の観点やプレス成形工程の数の観点などから、第5発明では2mm以下の板状素材を用いることで製造コストや製造コストの適正化を図っている。 If it is a manufacturing method of the 3rd invention , it is possible to manufacture the piping member which consists of a cylindrical part and a collar part by press molding, but from the viewpoint of the damage avoidance of a raw material, the viewpoint of the number of press molding processes, etc. In 5 invention, optimization of manufacturing cost and manufacturing cost is aimed at by using a plate-shaped material of 2 mm or less.

第1発明によれば、より安価により早く配管部材を製造することができる。また、鍔部が複雑な形状である場合にも、素材の損傷を回避しながら鍔部を精度よく成形することができる。 According to the first invention, the piping member can be manufactured more quickly at a lower cost. Further, even when the collar portion has a complicated shape, the collar portion can be accurately formed while avoiding damage to the material.

第2発明によれば、第1ステップにおける板状素材からのプレス成形が、無理なく良好に行われるようになる。 According to the second invention , the press molding from the plate-like material in the first step can be carried out satisfactorily and comfortably.

第3,第4発明によれば、プレス成形によって円筒部及び鍔部から成る配管部材を歩留まりよく製造することができる。 According to the 3rd and 4th invention , the piping member which consists of a cylindrical part and a collar part by press molding can be manufactured with a sufficient yield.

<貯湯式給湯機の構成>
図1に、本実施形態に係る配管部材(管座)を使用した貯湯式給湯機の外観斜視図を、図2に、貯湯式給湯機の構成図を示す。図1おいて、貯湯式給湯機1は、ヒートポンプユニット2と貯湯装置3とによって構成され、ヒートポンプユニット2のケーシング内には、蒸気圧縮式の冷凍回路が収納され、貯湯装置3のケーシング内には、貯湯タンク31が収納されている。
<Configuration of hot water storage type water heater>
FIG. 1 is an external perspective view of a hot water storage type hot water heater using a piping member (pipe seat) according to the present embodiment, and FIG. 2 is a configuration diagram of the hot water storage type hot water heater. In FIG. 1, a hot water storage type water heater 1 includes a heat pump unit 2 and a hot water storage device 3, and a vapor compression refrigeration circuit is accommodated in the casing of the heat pump unit 2. The hot water storage tank 31 is accommodated.

図2において、ヒートポンプユニット2は、マフラー21a、圧縮機21、水熱交換器22内の冷媒管22a、減圧手段としての膨張弁23、及び空気熱交換器24が、冷媒配管25によって環状に接続された蒸気圧縮式の冷凍回路20を有する。   In FIG. 2, the heat pump unit 2 includes a muffler 21 a, a compressor 21, a refrigerant pipe 22 a in the water heat exchanger 22, an expansion valve 23 as a decompression unit, and an air heat exchanger 24 connected in a ring shape by a refrigerant pipe 25. The vapor compression refrigeration circuit 20 is provided.

また、冷凍回路20には、水熱交換器22から出る高圧高温の冷媒と、空気熱交換器24から出る低圧低温の冷媒との間で熱交換を行うため、液ガス熱交換器26が配置されている。具体的には、水熱交換器22と膨張弁23とを連結する冷媒通路と、空気熱交換器24と圧縮機21とを連結する冷媒通路との間で熱交換が行われる。   The refrigeration circuit 20 is provided with a liquid gas heat exchanger 26 for heat exchange between the high-pressure and high-temperature refrigerant coming out of the water heat exchanger 22 and the low-pressure and low-temperature refrigerant coming out of the air heat exchanger 24. Has been. Specifically, heat exchange is performed between the refrigerant passage connecting the water heat exchanger 22 and the expansion valve 23 and the refrigerant passage connecting the air heat exchanger 24 and the compressor 21.

貯湯装置3は、貯湯タンク31、水熱交換器22内の水管22b及び水循環ポンプ32が、水循環配管35によって環状に接続された水循環回路30を有する。制御装置4は、ヒートポンプユニット2と貯湯装置3を運転制御する。   The hot water storage device 3 includes a water circulation circuit 30 in which a hot water storage tank 31, a water pipe 22 b in the water heat exchanger 22, and a water circulation pump 32 are annularly connected by a water circulation pipe 35. The control device 4 controls the operation of the heat pump unit 2 and the hot water storage device 3.

<貯湯タンクを含む貯湯装置の構成>
図3は、貯湯式給湯機1の貯湯装置3と負荷とを連絡する配管の回路図である。なお、ここで述べる負荷とは、給湯と風呂を指す。給湯管71は、貯湯タンク31の頭部と給湯混合弁73とを連絡する。給湯管71は給湯分岐管71a,71bを有しており、給湯分岐管71aは、給湯管71と湯はり混合弁74とを連絡し、給湯分岐管71bは、給湯管71と逃し弁75とを連絡している。
<Configuration of hot water storage device including hot water storage tank>
FIG. 3 is a circuit diagram of piping for connecting the hot water storage device 3 of the hot water storage type hot water supply device 1 and a load. In addition, the load described here refers to hot water supply and a bath. The hot water supply pipe 71 communicates the head of the hot water storage tank 31 with the hot water supply mixing valve 73. The hot water supply pipe 71 has hot water supply branch pipes 71 a and 71 b, the hot water supply branch pipe 71 a connects the hot water supply pipe 71 and the hot water beam mixing valve 74, and the hot water supply branch pipe 71 b includes the hot water supply pipe 71 and the relief valve 75. Have contacted.

給水管72は、水供給源と給湯混合弁73を連絡する。給水管72は、給水分岐管72a、72bを有している。給水分岐管72aは、給水管72と湯はり混合弁74とを連絡し、給水分岐管72bは、給水管72と貯湯タンク31の底部とを連絡している。なお、給水分岐管72aと給水分岐管72bとの上流には、減圧逆止弁76が接続されている。また、給水分岐管72bの貯湯タンク31から離れた位置には、水温センサ41が設けられている。水温センサ41は、貯湯タンク31から温度影響を受けないように配慮されている。   The water supply pipe 72 connects the water supply source and the hot water supply mixing valve 73. The water supply pipe 72 has water supply branch pipes 72a and 72b. The water supply branch pipe 72 a connects the water supply pipe 72 and the hot water mixing valve 74, and the water supply branch pipe 72 b connects the water supply pipe 72 and the bottom of the hot water storage tank 31. A pressure reducing check valve 76 is connected upstream of the water supply branch pipe 72a and the water supply branch pipe 72b. A water temperature sensor 41 is provided at a position away from the hot water storage tank 31 in the water supply branch pipe 72b. The water temperature sensor 41 is considered so as not to be affected by the temperature from the hot water storage tank 31.

湯循環配管77は、貯湯タンク31の頭部と貯湯タンク31の底部を連絡しており、途中には追焚熱交換器78と循環ポンプ79が接続されている。   The hot water circulation pipe 77 communicates the head of the hot water storage tank 31 and the bottom of the hot water storage tank 31, and an additional heat exchanger 78 and a circulation pump 79 are connected on the way.

第2給湯管81は、給湯混合弁73と給湯口82とを連絡し、途中に給湯水量センサ42aが配置されている。第3給湯管83は、湯はり混合弁74と風呂水循環配管91とを連絡しており、途中に複合水弁84が配置されている。複合水弁84は、湯はり電磁弁84aと、排水弁84bと、湯はり水量センサ42bとで構成されている。   The second hot water supply pipe 81 connects the hot water supply mixing valve 73 and the hot water supply port 82, and a hot water supply water amount sensor 42a is disposed on the way. The third hot water supply pipe 83 communicates the hot water mixing valve 74 and the bath water circulation pipe 91, and a composite water valve 84 is disposed on the way. The composite water valve 84 includes a hot water solenoid valve 84a, a drain valve 84b, and a hot water volume sensor 42b.

風呂水循環配管91は、浴槽92から出て浴槽92に戻り、途中に風呂水循環ポンプ93が接続されている。なお、追焚熱交換器78において、風呂水循環配管91と湯循環配管77との間で熱交換が行われる。   The bath water circulation pipe 91 exits from the bathtub 92 and returns to the bathtub 92, and a bath water circulation pump 93 is connected on the way. It should be noted that heat is exchanged between the bath water circulation pipe 91 and the hot water circulation pipe 77 in the memory heat exchanger 78.

貯湯タンク31の側壁には、頭部から底部へ向かい一定間隔をおいて残湯量検知手段としての温度センサ44a〜44eが設けられている。貯湯タンク31の各高さ位置の湯温を温度センサ44a〜44eで検知することによって、湯の温度と残湯量とが算出される。なお、貯湯タンク31は、側壁全周、頭部および底部を断熱材で覆われている。   On the side wall of the hot water storage tank 31, temperature sensors 44 a to 44 e are provided as remaining hot water amount detection means at regular intervals from the head to the bottom. By detecting the hot water temperature at each height position of the hot water storage tank 31 with the temperature sensors 44a to 44e, the temperature of the hot water and the remaining hot water amount are calculated. In addition, the hot water storage tank 31 is covered with a heat insulating material on the entire side wall, the head, and the bottom.

<貯湯タンクに溶接固定される配管部材の構成>
上述のように、貯湯タンク31には、給湯管71、給水管72、湯循環配管77、水循環配管35などの、水や湯が通る多数の配管が接続されている。これらの各配管(これ以降、配管180と呼ぶ)と貯湯タンク31とを結ぶために、管座と呼ばれる配管部材60が使用されている。配管部材60は、図5に示すように、主として、円筒部61と、その円筒部61よりも外径が小さく且つ薄肉の先端薄肉円筒部62と、円筒部61を挟んで先端薄肉円筒部62とは反対側に配置される鍔部63とから成る。鍔部63は、円筒部61の一端から径方向外方に延びる環状の部分である。
<Configuration of piping member welded and fixed to hot water storage tank>
As described above, the hot water storage tank 31 is connected with a number of pipes through which water and hot water pass, such as the hot water supply pipe 71, the water supply pipe 72, the hot water circulation pipe 77, and the water circulation pipe 35. In order to connect each of these pipes (hereinafter referred to as the pipe 180) and the hot water storage tank 31, a pipe member 60 called a pipe seat is used. As shown in FIG. 5, the piping member 60 mainly includes a cylindrical portion 61, a thin tip cylindrical portion 62 having a smaller outer diameter than the cylindrical portion 61, and a thin tip cylindrical portion 62 sandwiching the cylindrical portion 61. It consists of the collar part 63 arrange | positioned on the opposite side. The collar portion 63 is an annular portion that extends radially outward from one end of the cylindrical portion 61.

配管部材60は、図4A,図4B及び図5に示すように、例えば、貯湯タンク31の平面部31aに形成された孔に差し込まれ、貯湯タンク31と溶接される。具体的には、貯湯タンク31の平面部31aに、孔と、その孔の周りから貯湯タンク31の内部に向けて折り曲げられた円筒部31b(図5参照)とが形成されている。その貯湯タンク31の孔に、配管部材60の先端薄肉円筒部62が差し込まれる。そして、配管部材60の先端薄肉円筒部62の端部と、貯湯タンク31の円筒部31bの先端部とが、全周溶接される。これにより、配管部材60が貯湯タンク31に固定される。   As shown in FIGS. 4A, 4 </ b> B, and 5, the piping member 60 is inserted into a hole formed in the flat portion 31 a of the hot water storage tank 31 and welded to the hot water storage tank 31, for example. Specifically, a hole and a cylindrical portion 31 b (see FIG. 5) that is bent from the periphery of the hole toward the inside of the hot water storage tank 31 are formed in the flat surface portion 31 a of the hot water storage tank 31. The thin-walled cylindrical portion 62 of the pipe member 60 is inserted into the hole of the hot water storage tank 31. The end of the thin cylindrical portion 62 of the pipe member 60 and the tip of the cylindrical portion 31b of the hot water storage tank 31 are welded all around. Thereby, the piping member 60 is fixed to the hot water storage tank 31.

差し込みや全周溶接のため、配管部材60の先端薄肉円筒部62は、その外形寸法が特に精度よく製造されている必要があるとともに、配管部材60の先端薄肉円筒部62の外周面と円筒部61の外周面との境界には、貯湯タンク31の孔周辺の平面部31aに押し当たる段差66が形成されている必要がある。   For insertion and all-around welding, the thin-walled cylindrical portion 62 of the pipe member 60 needs to be manufactured with a particularly accurate outer dimension, and the outer peripheral surface and the cylindrical portion of the thin-walled cylindrical portion 62 of the pipe member 60 are used. A step 66 that presses against the flat portion 31 a around the hole of the hot water storage tank 31 needs to be formed at the boundary with the outer peripheral surface of 61.

一方、配管部材60の鍔部63は、図5に示すように、貯湯タンク31と接続する配管180の鍔部181と当接し、クイックファスナー190によって鍔部63と離反不能に連結される。クイックファスナー190は、図6A,図6Bに示す形状の金属製の配管継ぎ手部材であり、そのバネ特性を利用して、長孔190aの左右に位置する把持部191,192で接続対象の両部材の円筒状胴部を把持する。具体的には、互いに当接した状態の配管部材60の鍔部63及び配管180の鍔部181がクイックファスナー190の長孔190aに嵌り込み、配管部材60の円筒部61を把持した把持部191と配管180の円筒状胴部を把持した把持部192とが、配管部材60と配管180との軸方向の離反を妨げる(図5参照)。   On the other hand, as shown in FIG. 5, the flange portion 63 of the piping member 60 contacts the flange portion 181 of the pipe 180 connected to the hot water storage tank 31 and is connected to the flange portion 63 by the quick fastener 190 so as not to be separated. The quick fastener 190 is a metal pipe joint member having the shape shown in FIGS. 6A and 6B, and both members to be connected by the gripping portions 191 and 192 positioned on the left and right of the long hole 190 a using the spring characteristics. Grip the cylindrical body. Specifically, the grip portion 191 that grips the cylindrical portion 61 of the piping member 60 by fitting the flange portion 63 of the piping member 60 and the flange portion 181 of the piping 180 in contact with each other into the elongated hole 190 a of the quick fastener 190. And the grip 192 that grips the cylindrical body of the pipe 180 prevent the pipe member 60 and the pipe 180 from separating in the axial direction (see FIG. 5).

このクイックファスナー190が配管継ぎ手となるため、配管部材60の鍔部63は、その厚み(軸方向の長さ)L3が所定寸法だけ確保されている必要があり、また、クイックファスナー190の把持部191が引っ掛かる面の径方向寸法が所定寸法だけ確保されている必要がある。   Since the quick fastener 190 serves as a pipe joint, the flange 63 of the pipe member 60 needs to have a predetermined thickness L3 (length in the axial direction). Only a predetermined dimension needs to be secured in the radial dimension of the surface on which 191 is caught.

以上のような配管部材60に求められる要求を満たしつつ、厚肉素材から切削加工などによって配管部材を製造することで従来において多大にかかっていた製造時間を短縮化するために、ここでは、配管部材60を複数のプレス成形工程によって製造することとし、配管部材60の形状に工夫を凝らしている。   In order to shorten the manufacturing time that has been required in the past by manufacturing the piping member by cutting from a thick material while satisfying the requirements required for the piping member 60 as described above, here, the piping The member 60 is manufactured by a plurality of press molding processes, and the shape of the piping member 60 is devised.

板状素材50(図7及び図8参照)から複数のプレス成形工程により一体成形される配管部材60は、その鍔部63が、段差67を含む断面形状を持つ(図5参照)。そして、その鍔部63の厚みL3は、板状素材50の厚みt1よりも大きくなっている。ここでは、厚みt1=1.5mm、厚みL3=2.8mmである。また、鍔部63の段差67は、約90°に曲がる湾曲部を含んでおり、その湾曲部の表面の曲率半径Rである寸法r4(図5参照)が、0.5mm以下に成形されている。   The piping member 60 integrally formed from the plate-like material 50 (see FIGS. 7 and 8) by a plurality of press forming processes has a cross-sectional shape in which the flange portion 63 includes a step 67 (see FIG. 5). The thickness L3 of the flange 63 is larger than the thickness t1 of the plate material 50. Here, the thickness t1 = 1.5 mm and the thickness L3 = 2.8 mm. Further, the step 67 of the flange portion 63 includes a curved portion that bends to about 90 °, and a dimension r4 (see FIG. 5) that is a radius of curvature R of the surface of the curved portion is formed to be 0.5 mm or less. Yes.

また、厚肉(厚みt1)の円筒部61と薄肉(厚みt2)の先端薄肉円筒部62との境界に段差66が形成され、先端薄肉円筒部62の外径と貯湯タンク31の平面部31aの孔の内径とが一致するように、且つ、先端薄肉円筒部62の先端と貯湯タンク31の円筒部31bの先端とが同じ高さ位置になるように、配管部材60がプレス成形される。   Further, a step 66 is formed at the boundary between the thick-walled (thickness t1) cylindrical portion 61 and the thin-walled (thickness t2) distal thin-walled cylindrical portion 62, and the outer diameter of the thin-walled cylindrical portion 62 and the flat surface portion 31a of the hot water storage tank 31 are formed. The piping member 60 is press-molded so that the inner diameter of each of the holes coincides, and the tip of the thin-walled cylindrical portion 62 and the tip of the cylindrical portion 31b of the hot water storage tank 31 are at the same height.

なお、図5に示す各寸法は、D1=20mm又は26mm、D2=22mm又は27mm、L1=6.5〜10.0mm、L2=1.5〜4.0mm、L3=2.6〜3.0mm、L4=1.0〜4.3mm、t1=0.5〜2.0mm、t2=0.5〜1.8mm(但し、t2<t1)、r1>1.0mm、r2<0.5mm、r3<0.5mm、r4<0.5mmという各範囲から決められている。ここでは、D1=20mm、D2=22mm、L1=9.0mm、L2=2.0mm、L3=2.8mm、L4=4.2mm、t1=1.5mm、t2=1.0mm、r1>1.0mm、r2<0.5mm、r3<0.5mm、r4<0.5mmという配管部材60を製造している。   In addition, each dimension shown in FIG. 5 is D1 = 20mm or 26mm, D2 = 22mm or 27mm, L1 = 6.5-10.0mm, L2 = 1.5-4.0mm, L3 = 2.6-3. 0 mm, L4 = 1.0 to 4.3 mm, t1 = 0.5 to 2.0 mm, t2 = 0.5 to 1.8 mm (where t2 <t1), r1> 1.0 mm, r2 <0.5 mm R3 <0.5 mm and r4 <0.5 mm. Here, D1 = 20 mm, D2 = 22 mm, L1 = 9.0 mm, L2 = 2.0 mm, L3 = 2.8 mm, L4 = 4.2 mm, t1 = 1.5 mm, t2 = 1.0 mm, r1> 1 A piping member 60 of 0.0 mm, r2 <0.5 mm, r3 <0.5 mm, r4 <0.5 mm is manufactured.

<配管部材の製造方法>
上記の配管部材60は、図5における下部が貯湯タンク31に溶接される先端薄肉円筒部62となり、図5における上部が配管181との接続部となる鍔部63となり、先端薄肉円筒部62と円筒部61との間に段差66があり、鍔部63と円筒部61との間に段差67がある配管部材60と言うことができる。この配管部材60は、図7〜図9に示すように、多数のプレス成形工程を含む10の工程(S1〜S10)によって製造される。しかし、数秒以内で1つの工程が完了し、次々と横に流れていくため、配管部材60の製造に要する延べ時間は、従来の機械加工を用いた製造方法に較べてかなり短くなっている。
<Manufacturing method of piping member>
In the piping member 60, the lower part in FIG. 5 is a tip thin-walled cylindrical part 62 welded to the hot water storage tank 31, and the upper part in FIG. 5 is a flange part 63 that is a connection part to the pipe 181. It can be said that there is a step 66 between the cylindrical portion 61 and the piping member 60 having a step 67 between the flange 63 and the cylindrical portion 61. This piping member 60 is manufactured by 10 processes (S1-S10) including many press molding processes, as shown in FIGS. However, since one process is completed within several seconds and flows one after another, the total time required for manufacturing the piping member 60 is considerably shorter than that of a manufacturing method using conventional machining.

ここでは、図7及び図8の左端部分に示すように、略円形の板状素材50に対して順にプレス成形工程等を施していく。板状素材50は、クロム(Cr)含有量が17〜20%、モリブデン(Mo)含有量が1.7〜2.5%、炭素(C)含有量が0.03以下のフェライト系ステンレス鋼である。板状素材50として、2mm以下の厚みのものを用いることで、このような組成の材料であってもプレス成形が可能となっており、プレス成形による板状素材50の損傷も殆ど起こらない。ここでは、板厚が1.5mmの板状素材50を用いている。   Here, as shown in the left end portion of FIG. 7 and FIG. 8, a press forming process or the like is sequentially performed on the substantially circular plate-shaped material 50. The plate material 50 is a ferritic stainless steel having a chromium (Cr) content of 17 to 20%, a molybdenum (Mo) content of 1.7 to 2.5%, and a carbon (C) content of 0.03 or less. It is. By using a plate-like material 50 having a thickness of 2 mm or less, even a material having such a composition can be press-molded, and the plate-like material 50 is hardly damaged by the press-molding. Here, a plate-like material 50 having a plate thickness of 1.5 mm is used.

各工程(S1〜S10)については後に詳述することとし、まずは製造方法の全体について述べる。   Each step (S1 to S10) will be described in detail later. First, the entire manufacturing method will be described.

配管部材60の製造方法は、板状素材50を、プレス成形によって、厚肉円筒状の第1部(51a・・・51h)と、それに隣接し先端薄肉円筒部62となる薄肉円筒状の第2部(52a・・・52h)とを含む形状にするとともに、第1部(51h)と第2部(52h)との境界に段差(56h)が生じるように成形する製造方法であると言うことができる。   The manufacturing method of the piping member 60 includes a plate-shaped material 50 formed by press forming a thin cylindrical first portion (51a... 51h) and a thin cylindrical portion 62 adjacent to the first thin cylindrical portion 62 adjacent thereto. It is said that it is a manufacturing method in which a shape including two parts (52a... 52h) is formed and a step (56h) is formed at the boundary between the first part (51h) and the second part (52h). be able to.

また、配管部材60の製造方法は、段差66になる部分に着目すると、穴あけ前の工程群(S1〜S6)と、穴あけ工程S7と、穴あけ後の工程群(S8〜S10)との3つのステップに分けて考えることができる。穴あけ前の工程群(S1〜S6)では、板状素材50を、プレス成形によって、円筒状の厚肉の第1部(51a・・・51f)と、それに隣接し先端薄肉円筒部62となる薄肉の第2部(52f)とを含む形状に成形する。第1部(51a・・・51f)と第2部(52a・・・52f)とは、円筒部分と、その円筒部分の一端を塞ぐ円盤部分との関係になっており、互いに直交している。第6絞り工程S6を終えた第1部(51f)及び第2部(52f)の厚みは、t1及びt2(t2<t1)となっており、第2部(52f)のほうは複数の絞り工程(プレス成形工程)を経て板厚t2が薄くなっている。穴あけ後の工程群(S8〜S10)では、特に第1仕上絞り工程S8によって、中央部分が切り抜かれて環状となった第2部(52g)を円筒状に成形し、第1部(51h)と第2部(52h)の境界に段差(56h)を生じさせる。さらに、第2仕上絞り工程S9において、円筒状となった第2部(52h)に対して軸方向に圧縮する力を作用させ、第2部を先端薄肉円筒部62の最終形状に成形する。   Moreover, when the manufacturing method of the piping member 60 pays attention to the part used as the level | step difference 66, three processes, the process group before drilling (S1-S6), the drilling process S7, and the process group after drilling (S8-S10). It can be divided into steps. In the process group (S1 to S6) before drilling, the plate-shaped material 50 is formed into a cylindrical thick first part (51a... 51f) and a tip thin cylindrical part 62 adjacent thereto by press molding. It shape | molds in the shape containing 2nd thin part (52f). The first part (51a... 51f) and the second part (52a... 52f) are in a relationship between a cylindrical part and a disk part that closes one end of the cylindrical part, and are orthogonal to each other. . The thickness of the first part (51f) and the second part (52f) after the sixth drawing step S6 is t1 and t2 (t2 <t1), and the second part (52f) has a plurality of diaphragms. The plate thickness t2 is reduced through the process (press molding process). In the process group (S8 to S10) after drilling, the second part (52g), which is formed in a ring shape by cutting out the central part, is formed into a cylindrical shape by the first finishing drawing process S8, and the first part (51h) And a step (56h) is produced at the boundary between the second part (52h). Further, in the second finishing drawing step S <b> 9, an axial compression force is applied to the cylindrical second part (52 h), and the second part is formed into the final shape of the thin-walled cylindrical part 62 at the tip.

なお、穴あけ前の工程群(S1〜S6)は、第2部(52a)が円筒状の第1部(51a)の一端を塞ぐ円盤形状になるように板状素材50を成形する第1絞り工程S1と、その第2部(52a)の厚みを薄くしていく薄肉化工程群(S2〜S6)との2つのステップに分けて考えることができる。   In addition, the process group (S1-S6) before drilling is the 1st aperture_diaphragm | restriction which shape | molds the plate-shaped raw material 50 so that the 2nd part (52a) may become the disk shape which plugs up the end of the cylindrical 1st part (51a). This can be divided into two steps: a process S1 and a thinning process group (S2 to S6) for reducing the thickness of the second part (52a).

また、穴あけ前の工程群(S1〜S6)は、鍔部63の成形に着目すると、鍔部成形前の第1絞り工程S1と、それ以降の鍔部成形工程群(S2〜)との2つのステップに分けて考えることができる。第1絞り工程S1では、板状素材50を、プレス成形によって、円筒状の第1部(51a)を含む初期形状に成形する。そして、第2絞り工程S2以降の鍔部成形工程群では、初期形状となった成形中間材の第1部(51a)の端部近傍部分を湾曲させて径方向外方に延ばし、第1部(51a)を、第1部(51b・・・)及び第3部(53b・・・)とし、円筒部61及び鍔部63の形状に成形していく。   In addition, the process group (S1 to S6) before drilling focuses on the forming of the collar part 63, and includes the first drawing process S1 before the collar part molding and the subsequent collar part molding process group (S2). It can be divided into two steps. In the first drawing step S1, the plate-like material 50 is formed into an initial shape including a cylindrical first portion (51a) by press molding. And in the collar part forming process group after the second drawing process S2, the end part of the first part (51a) of the forming intermediate material having the initial shape is curved and extended radially outward, and the first part. (51a) is a first part (51b...) And a third part (53b...), And is formed into the shape of the cylindrical part 61 and the collar part 63.

また、穴あけ前の工程群(S1〜S6)は、段差67になる部分に着目すると、鍔部63の詳細形状成形前の準備工程群(S1〜S3)と、鍔部63の詳細形状成形の工程群(S4〜S6)との2つのステップに分けて考えることができる。鍔部63の詳細形状成形前の準備工程群(S1〜S3)では、板状素材50を、複数の絞り工程(プレス成形工程)によって、円筒部61となる第1部(51c)及び鍔部63となる第3部(53c)を含む成形中間材に成形する。そして、鍔部63の詳細形状成形の工程群(S4〜S6)では、複数の絞り工程によって、成形中間材の第3部(53d・・・53f)に段差(57e)を形成していく。この段差(57e)は、軸方向にも径方向にも段がある段差である。   Moreover, the process group (S1-S6) before drilling pays attention to the part which becomes the level | step difference 67, the preparation process group (S1-S3) before detailed shape shaping | molding of the collar part 63, and the detailed shape shaping | molding of the collar part 63. It can be divided into two steps, the process group (S4 to S6). In the preparation process group (S1 to S3) before forming the detailed shape of the flange part 63, the plate-shaped material 50 is subjected to a plurality of drawing processes (press forming process), and the first part (51c) and the flange part that become the cylindrical part 61 Molded into a molding intermediate material including the third part (53 c) to be 63. In the detailed shape forming step group (S4 to S6) of the flange portion 63, a step (57e) is formed in the third portion (53d... 53f) of the forming intermediate material by a plurality of drawing steps. The step (57e) is a step having steps both in the axial direction and in the radial direction.

さらに、段差67になる部分に着目すると、穴あけ工程S7及び穴あけ後の工程群(S8〜S10)は、段差67の仕上げ工程群(S7〜S9)と、段差67を完成させる外径抜き工程S10との2つのステップに分けて考えることができる。段差67の仕上げ工程群(S7〜S9)では、段差(57e)が形成された成形中間材の第3部(53f)を、複数の工程によって、最終段差形状を含む形状に仕上げる。そして、外径抜き工程S10では、最終段差形状を含む形状になった成形中間材の第3部(53i)の径方向外側部分(55j)を切断し、成形中間材の第3部(53j)とする。これにより、第3部(53j)が、所定の外形寸法である鍔部63として完成する。   Further, when paying attention to the portion that becomes the step 67, the drilling step S7 and the process group after drilling (S8 to S10) are the finishing process group (S7 to S9) of the step 67 and the outer diameter removing process S10 that completes the step 67. Can be divided into two steps. In the finishing step group (S7 to S9) of the step 67, the third part (53f) of the molded intermediate material on which the step (57e) is formed is finished into a shape including the final step shape by a plurality of steps. In the outer diameter removing step S10, the radially outer portion (55j) of the third part (53i) of the molded intermediate material having the shape including the final step shape is cut to form the third part (53j) of the molded intermediate material. And As a result, the third portion (53j) is completed as the flange portion 63 having a predetermined outer dimension.

それでは、次に、各工程(S1〜S10)について詳述する。   Then, each process (S1-S10) is explained in full detail next.

〔S1:第1絞り工程〕
図7及び図8に示すように、一部を除いて周囲が切断された円形の板状素材50に、まずは最初のプレス成形工程である第1絞り工程S1が実施される。ここでは、板状素材50が上下の金型に挟まれ、円筒状の第1部(51a)及び円盤状の第2部(52a)から成るグラス状の形状になるように、板状素材50がプレス成形される。これにより、板状素材50は、図8に示すような断面が凹状(グラス状)の初期形状に成形される。
[S1: First drawing step]
As shown in FIGS. 7 and 8, first, a first drawing step S <b> 1 that is the first press forming step is performed on a circular plate-shaped material 50 whose periphery is cut except for a part. Here, the plate-like material 50 is sandwiched between upper and lower molds so as to have a glass-like shape composed of a cylindrical first part (51a) and a disk-like second part (52a). Is press-molded. Thereby, the plate-shaped raw material 50 is shape | molded by the initial shape whose cross section as shown in FIG. 8 is concave (glass shape).

〔S2:第2絞り工程〕
次に、複数のプレス成形工程(工程S2〜S6)によって、第1部(51a)のうち第2部(52a)とは反対側の端部近傍部分を湾曲させて径方向外方に延ばすとともに、第2部(52a)の板厚を薄くする。
[S2: Second drawing step]
Next, by a plurality of press molding steps (steps S2 to S6), the first portion (51a) is curved in the vicinity of the end opposite to the second portion (52a) and extended radially outward. The thickness of the second part (52a) is reduced.

まず、第2絞り工程S2では、第1部(51a)の上部が斜め上方に向くように第1部(51a)を湾曲させ、第1部(51a)を、第1部(51b)及び第3部(53b)にする。また、第2部(52a)に対して板厚方向(上下方向)に金型から圧縮力を作用させ、第2部(52a)を、それよりも少し板厚が薄い第2部(52b)とする。   First, in the second squeezing step S2, the first part (51a) is bent so that the upper part of the first part (51a) faces obliquely upward, and the first part (51a) is changed to the first part (51b) and the first part (51b). 3 parts (53b). Further, a compressive force is applied from the mold in the thickness direction (vertical direction) to the second portion (52a), and the second portion (52a) is slightly thinner than the second portion (52b). And

〔S3:第3絞り工程〕
第3絞り工程S3では、第3部(53b)がより水平方向に近づくようにプレス成形するとともに、第2部(52b)を、それよりも少し板厚が薄い第2部(52c)とする。
[S3: Third drawing step]
In the third squeezing step S3, the third part (53b) is press-molded so as to be closer to the horizontal direction, and the second part (52b) is a second part (52c) slightly thinner than that. .

〔S4:第4絞り工程〕
第4絞り工程S4では、第3部(53c)が途中で上に向くように、第3部(53c)の先端側の略半分を、これまでとは逆側に湾曲させる。このプレス成形を受けた第3部(53c)には、段差が生じる。
[S4: Fourth drawing step]
In the fourth squeezing step S4, approximately half of the distal end side of the third part (53c) is bent to the opposite side so far so that the third part (53c) faces upward in the middle. A step is generated in the third part (53c) that has undergone the press molding.

また、第4絞り工程S4でも、第2部(52c)を、それよりも少し板厚が薄い第2部(52d)とする。   Also in the fourth drawing step S4, the second part (52c) is a second part (52d) having a slightly smaller plate thickness.

〔S5:第5絞り工程〕
第5絞り工程S5では、上を向いた第3部(53d)の先端側の略半分のうち先端部分について、先端が水平方向に近づくように、さらにプレス成形を行って先端を外方に曲げる。これにより、第5絞り工程S5を経た第3部(53e)には、軸方向(上下方向)にも径方向(水平方向)にも段がある段差(57e)が生じてくる。
[S5: Fifth drawing step]
In the fifth squeezing step S5, press molding is further performed to bend the tip outward so that the tip approaches the horizontal direction of the tip half of the third half (53d) facing upward. . Accordingly, a step (57e) having a step in the axial direction (vertical direction) and the radial direction (horizontal direction) is generated in the third part (53e) that has undergone the fifth drawing step S5.

また、第5絞り工程S5でも、第2部(52d)を、それよりも少し板厚が薄い第2部(52e)とする。   Also in the fifth drawing step S5, the second part (52d) is a second part (52e) having a slightly smaller plate thickness.

〔S6:第6絞り工程〕
第6絞り工程S6では、第3部(53e)については段差(57e)の湾曲部の角度がより小さくなるようにプレス成形をかける。これにより、第3部(53e)は、より最終形状に近い第3部(53f)となる。
[S6: Sixth drawing step]
In the sixth drawing step S6, the third part (53e) is press-molded so that the angle of the curved part of the step (57e) becomes smaller. Thereby, the third part (53e) becomes the third part (53f) closer to the final shape.

また、第6絞り工程S6でも、第2部(52e)を、それよりも少し板厚が薄い第2部(52f)とする。この第6絞り工程S6を経た中間成形材の第2部(52f)の板厚はt2となる。一方、中間成形材の第1部(51f)の板厚はt1である。   Also in the sixth drawing step S6, the second part (52e) is a second part (52f) having a slightly smaller plate thickness. The thickness of the second part (52f) of the intermediate formed material that has undergone the sixth drawing step S6 is t2. On the other hand, the thickness of the first part (51f) of the intermediate molding material is t1.

〔S7:穴あけ工程〕
第6絞り工程S6の次に行われる穴あけ工程S7では、グラス状の中間成形材の底部になっている第2部(52f)の中央部分を切り離す。具体的には、第1部(51f)の内径よりも少し小さい径の丸い穴を第2部(52f)に開ける。これにより、第2部(52f)は、円形の中央部分(54g)が切り抜かれた環状の第2部(52g)となる。
[S7: Drilling step]
In the drilling step S7 performed after the sixth squeezing step S6, the central portion of the second part (52f) which is the bottom of the glass-like intermediate molding material is cut off. Specifically, a round hole having a diameter slightly smaller than the inner diameter of the first part (51f) is formed in the second part (52f). Thereby, the second part (52f) becomes an annular second part (52g) in which a circular central part (54g) is cut out.

また、第3部(53f)は、より最終形状に近い第3部(53g)となる。   Further, the third part (53f) becomes the third part (53g) closer to the final shape.

〔S8:第1仕上絞り工程〕
第1仕上絞り工程S8では、環状の第2部(52g)が下方に向くようにプレス成形を施す。これにより、環状の第2部(52g)は、第1部(51g)との境界近傍部分から先が、鉛直方向に延びるようになる。これにより、環状の第2部(52g)は、円筒状の第2部(52h)となる。また、これに伴い、第2部(52h)と第1部(51h)との境界部分に、段差(56h)が生じる。
[S8: First finishing drawing step]
In the first finish drawing step S8, press molding is performed so that the annular second portion (52g) faces downward. Thereby, the tip of the annular second part (52g) extends in the vertical direction from the vicinity of the boundary with the first part (51g). Thereby, the annular second part (52g) becomes the cylindrical second part (52h). Accordingly, a step (56h) is generated at the boundary between the second part (52h) and the first part (51h).

また、第3部(53g)は、より最終形状に近い第3部(53h)となる。   Further, the third part (53g) becomes the third part (53h) closer to the final shape.

〔S9:第2仕上絞り工程〕
第2仕上絞り工程S9は、先端薄肉円筒部62の外径と貯湯タンク31の平面部31aの孔の内径とを一致させること、及び、先端薄肉円筒部62の先端と貯湯タンク31の円筒部31bの先端とを同じ高さ位置にすることを目的として行われる工程である。
[S9: Second finishing drawing step]
In the second finishing drawing step S9, the outer diameter of the thin-walled cylindrical portion 62 and the inner diameter of the hole of the flat surface portion 31a of the hot water storage tank 31 are matched, and the distal end of the thin-walled cylindrical portion 62 and the cylindrical portion of the hot water storage tank 31 This is a process performed for the purpose of bringing the tip of 31b to the same height position.

第2仕上絞り工程S9では、円筒状となった第2部(52h)に対して軸方向に圧縮する力を作用させ、第2部(52h)を、先端薄肉円筒部62の最終形状と同じ形状の第2部(52i)に成形する。   In the second finishing drawing step S9, a force compressing in the axial direction is applied to the cylindrical second part (52h), and the second part (52h) is the same as the final shape of the thin-walled cylindrical part 62 at the tip. It shape | molds in the shape 2nd part (52i).

また、第3部(53h)は、外径を除いて最終形状と同じ形状である第3部(53i)となる。この第3部(53i)において、湾曲部が約90°に曲がった状態となり、その湾曲部の表面の曲率半径Rである寸法r4(図5参照)が0.5mm以下になる。   Further, the third part (53h) becomes the third part (53i) having the same shape as the final shape except for the outer diameter. In the third part (53i), the curved part is bent at about 90 °, and the dimension r4 (see FIG. 5), which is the curvature radius R of the surface of the curved part, is 0.5 mm or less.

〔S10:外径抜き工程〕
外径抜き工程S10では、成形中間材の第3部(53i)の径方向外側部分(55j)を切断し、第3部(53i)を、鍔部63と同じ外形寸法である第3部(53j)とする。この工程S10における切断は、鍔部63の段差67の最終段差形状となっている段差(57j)よりも径方向外側において行われる。
[S10: Outer diameter removing step]
In the outer diameter removing step S <b> 10, the radially outer portion (55 j) of the third portion (53 i) of the molded intermediate material is cut, and the third portion (53 i) is a third portion ( 53j). The cutting in this step S10 is performed on the outer side in the radial direction from the step (57j) which is the final step shape of the step 67 of the flange portion 63.

<配管部材の製造方法の特徴>
(1)
通常、円筒部と鍔部とから成る部材をプレス成形を使って製造する場合、鍔部を含む最終形状或いはその最終形状に近い形状になるように素材に対してプレス成形を施すが、そのような製造方法の場合、素材が硬かったり分厚かったりすると、うまくプレス成形を行うことが難しい。たとえプレス成形の設備を大型化しても、プレス成形をかけた素材が損傷する割合が大きくなる。このため、従来は、図10に示すような、3.5mmの板厚の厚肉円筒状素材に切削加工を施して、先端薄肉円筒部260eの板厚を1.0mm以下まで落とすという、機械加工による製造方法で配管部材260を製造しているが、その製造(加工)には長い時間とコストがかかる。
<Characteristics of manufacturing method of piping member>
(1)
Normally, when a member consisting of a cylindrical part and a collar part is manufactured using press molding, the material is press-molded so as to have a final shape including the collar part or a shape close to the final shape. In the case of a simple manufacturing method, if the material is hard or thick, it is difficult to perform press molding well. Even if the equipment for press molding is enlarged, the rate of damage to the material subjected to press molding increases. For this reason, conventionally, as shown in FIG. 10, a machine that cuts a thick cylindrical material having a thickness of 3.5 mm to reduce the thickness of the thin cylindrical portion 260e to 1.0 mm or less. Although the piping member 260 is manufactured by a manufacturing method by processing, the manufacturing (processing) takes a long time and cost.

これに対し、上述の配管部材60の製造方法では、まず第1絞り工程S1で円筒状の第1部(51a)を含む初期形状になるようにプレス成形を施し、それに続く鍔部成形工程群(S2〜)において、円筒状の第1部(51a)の端部近傍部分を湾曲させるプレス成形を施し、第1部(51a)を、円筒部61及び鍔部63に相当する第1部(51a・・・51j)及び第3部(53b・・・53j)に成形する。このため、複数回のプレス成形工程が必要にはなるが、第1絞り工程S1においても鍔部成形工程群(S2〜)においても、プレス成形による板状素材50や中間成形材の損傷が抑えられ、歩留まりがよい配管部材60の製造が実現できている。また、このような製造方法を採ることで、プレス成形による配管部材60の製造が実現できるため、従来の機械加工による配管部材の製造方法に較べ、その製造時間が短縮化されている。   On the other hand, in the manufacturing method of the piping member 60 described above, first, the first drawing step S1 is press-molded so as to have an initial shape including the cylindrical first portion (51a), and then the flange portion forming step group. In (S2), press molding is performed to curve the vicinity of the end of the cylindrical first part (51a), and the first part (51a) is the first part corresponding to the cylindrical part 61 and the flange part 63 ( 51a ... 51j) and the third part (53b ... 53j). For this reason, although a plurality of press forming steps are required, damage to the plate-like material 50 and the intermediate formed material due to press forming is suppressed in both the first drawing step S1 and the buttocks forming step group (S2). Thus, the production of the piping member 60 with a good yield can be realized. Moreover, since the manufacturing of the piping member 60 by press molding is realizable by taking such a manufacturing method, the manufacturing time is shortened compared with the manufacturing method of the piping member by the conventional machining.

このように、上述の製造方法によって、より安価により早く配管部材60を製造することができている。   As described above, the piping member 60 can be manufactured more quickly and cheaply by the above-described manufacturing method.

(2)
また、上述の製造方法では、多数のプレス成形工程(S2〜)によって、円筒状の第1部(51a)を第1部(51b・・・51j)及び第3部(53b・・・53j)にして円筒部61及び鍔部63に成形していくため、鍔部63が複雑な段差形状を含んでいても、損傷を回避しながら鍔部63を精度よく成形することができている。
(2)
Further, in the above-described manufacturing method, the cylindrical first part (51a) is changed into the first part (51b ... 51j) and the third part (53b ... 53j) by a number of press molding steps (S2 to S2). Thus, since the cylindrical portion 61 and the flange portion 63 are molded, even if the flange portion 63 includes a complicated step shape, the flange portion 63 can be accurately molded while avoiding damage.

(3)
上述の配管部材60の製造方法では、第1絞り工程S1において、断面が凹状の、すなわち、グラス状の初期形状になるように板状素材50をプレス成形し、その後の鍔部成形工程群(S2〜)で、第3部(53b)を径方向外方に延ばし、穴あけ工程S7で第2部(52f)の中央部分(54g)を切り離すことで、配管部材60を製造している。このように、第1絞り工程S1で成形する初期形状が円盤状の第2部(52a)を含むグラス状であることから、第1絞り工程S1における板状素材50からのプレス成形が、無理なく良好に行われ、板状素材50の損傷が殆どなくなって高い歩留まり率になっている。
(3)
In the manufacturing method of the piping member 60 described above, in the first squeezing step S1, the plate-like material 50 is press-molded so as to have a concave cross section, that is, a glass-like initial shape, and then a flange forming step group ( The piping member 60 is manufactured by extending the third portion (53b) radially outward in S2) and cutting the central portion (54g) of the second portion (52f) in the drilling step S7. Thus, since the initial shape formed in the first drawing step S1 is a glass shape including the disk-like second part (52a), press forming from the plate-like material 50 in the first drawing step S1 is impossible. This is performed well, and the plate-like material 50 is hardly damaged, resulting in a high yield rate.

(4)
上述の配管部材60では、段差を含む断面形状を持つ鍔部63を採用することで、板状素材50の厚み(t1)よりも大きい鍔部63の厚み(L3)を確保するようにしている。このため、板状素材50をプレス成形することによって所望の厚み(L3)の鍔部63を得ることができている。
(4)
In the above-described piping member 60, the thickness (L3) of the flange 63 larger than the thickness (t1) of the plate-like material 50 is secured by adopting the flange 63 having a cross-sectional shape including a step. . For this reason, the collar part 63 of desired thickness (L3) can be obtained by press-molding the plate-shaped raw material 50. FIG.

もしも、従来のように鍔部263の断面形状が単なる長方形であれば(図10参照)、その厚みを確保するために板状素材の板厚も同等の厚みにしなければならず、プレス成形が不可能になったり、可能であってもプレス設備のコストアップやプレス時間の長時間化が避けられなかったりする。しかし、上述のような段差67を含む配管部材60ならば、比較的薄い板状素材50をプレス成形して、所望の厚み(L3)の鍔部63を得ることができる。   If the cross-sectional shape of the collar portion 263 is a simple rectangle as in the prior art (see FIG. 10), the plate thickness of the plate-shaped material must be equal to ensure the thickness, It becomes impossible, or even if possible, it is unavoidable to increase the cost of the press equipment and lengthen the press time. However, if it is the piping member 60 containing the above-mentioned level | step difference 67, the comparatively thin plate-shaped raw material 50 can be press-molded, and the collar part 63 of desired thickness (L3) can be obtained.

このように、配管部材60ならば、プレス成形によって円筒部61と所望の厚み(L3)の鍔部63とを一体成形できる。このため、従来の機械加工による配管部材に較べ、その製造時間が短縮化されている。   Thus, if it is the piping member 60, the cylindrical part 61 and the collar part 63 of desired thickness (L3) can be integrally molded by press molding. For this reason, the manufacturing time is shortened compared with the piping member by the conventional machining.

(5)
上述の配管部材60の製造方法では、鍔部63の詳細形状成形前の準備工程群(S1〜S3)において第3部(53b,53c)を生じさせ、鍔部63の詳細形状成形の工程群(S4〜S6)において第3部(53c)に段差を形成し、段差ができた第3部(53d・・・53f)を穴あけ工程S7及び穴あけ後の工程群(S8〜S10)によって最終段差形状を含む形状に仕上げている。これにより、板状素材50の板厚(t1)を2mm以下(ここでは1.5mm)に抑えてプレス成形の設備にかかる費用を低減しつつ、鍔部63の所望の厚み(L3)を確保することができている。
(5)
In the manufacturing method of the piping member 60 described above, the third part (53b, 53c) is generated in the preparation process group (S1 to S3) before forming the detailed shape of the flange part 63, and the detailed shape forming process group of the flange part 63 is produced. In (S4 to S6), a step is formed in the third part (53c), and the third step (53d... 53f) having the step is formed by the drilling step S7 and the group of steps after drilling (S8 to S10). Finished in shape including shape. As a result, the plate thickness (t1) of the plate-like material 50 is suppressed to 2 mm or less (here, 1.5 mm), and the cost required for the press molding equipment is reduced, while the desired thickness (L3) of the collar portion 63 is secured. Have been able to.

(6)
上述の配管部材60の製造方法では、約90°に曲がる湾曲部の表面の曲率半径r4が0.5mm以下になるように多数のプレス成形を行う。このため、鍔部63のうち円筒部61の上端から径方向外方に長さL2だけ延びる部分の表面63aの径方向に沿った長さを大きく確保できるようになる。ここでは、その表面63aの径方向に沿った長さが、クイックファスナー190の厚みである1mm以上確保されている。したがって、配管180と接続させるために鍔部63にクイックファスナー190を掛ければ、その後にクイックファスナー190が勝手に外れてしまうことがない。
(6)
In the manufacturing method of the piping member 60 described above, many press moldings are performed so that the curvature radius r4 of the surface of the curved portion that bends to about 90 ° is 0.5 mm or less. For this reason, it becomes possible to secure a large length along the radial direction of the surface 63a of the portion of the flange portion 63 that extends from the upper end of the cylindrical portion 61 by the length L2 outward in the radial direction. Here, the length along the radial direction of the surface 63 a is secured to 1 mm or more which is the thickness of the quick fastener 190. Therefore, if the quick fastener 190 is hung on the collar part 63 in order to connect with the piping 180, the quick fastener 190 will not come off arbitrarily after that.

(7)
上述の配管部材60の製造方法では、外径抜き工程S10において第3部(53j)の外周縁近傍の部分である径方向外側部分(55j)を切断しているため、鍔部63の外周縁の形状の精度が高くなっている。
(7)
In the manufacturing method of the piping member 60 described above, the outer peripheral edge of the flange portion 63 is cut because the radially outer portion (55j), which is a portion near the outer peripheral edge of the third portion (53j), is cut in the outer diameter removing step S10. The accuracy of the shape is high.

(8)
上述の配管部材60の製造方法では、外径抜き工程S10において、段差(57j)の部分で切断すると切断厚みが大きくなることに鑑み、段差(57j)よりも径方向外側において切断を行っている。これにより、板状素材50の板厚(t1)の分だけ外径抜き工程S10において切断をすればよくなっており、切断装置の大型化や設備費用の増大が抑えられている。
(8)
In the manufacturing method of the piping member 60 described above, in the outer diameter removing step S10, cutting is performed on the radially outer side than the step (57j) in view of the fact that the cutting thickness increases when cutting at the step (57j). . Thereby, it is only necessary to cut in the outer diameter removing step S10 by the thickness (t1) of the plate-like material 50, and an increase in the size of the cutting device and an increase in equipment costs are suppressed.

(9)
上述の配管部材60の製造方法では、従来のように溶接部となる先端薄肉円筒部262(図10参照)を機械加工により成形するのではなく、第1仕上絞り工程S8において第1部(51h)と第2部(52h)との境界に段差(56h)が生じるようにプレス成形することによって配管部材60を製造している。このため、従来の機械加工による配管部材に較べ、より安価により早く配管部材60を製造することができるようになっている。
(9)
In the manufacturing method of the piping member 60 described above, the first thin-walled cylindrical portion 262 (see FIG. 10) to be a welded portion is not formed by machining as in the prior art, but the first portion (51h) in the first finishing drawing step S8. ) And the second part (52h), the piping member 60 is manufactured by press molding so that a step (56h) is generated. For this reason, compared with the piping member by the conventional machining, the piping member 60 can be manufactured earlier at a lower cost.

(10)
上述の配管部材60の製造方法では、円筒状の厚肉の第1部(51f)と、その第1部(51f)と交差するように隣接する薄肉の第2部(52f)とを、穴あけ前の工程群(S1〜S6)のプレス成形によって板状素材50から成形し、その後の穴あけ工程S7及び穴あけ後の工程群(S8〜S10)において、第2部(52g)を円筒状に成形するとともに、第1部(51h)と第2部(52h)との境界に段差(56h)を生じさせている。
(10)
In the manufacturing method of the piping member 60 described above, the cylindrical thick first portion (51f) and the thin second portion (52f) adjacent to intersect with the first portion (51f) are drilled. Formed from the plate-shaped material 50 by press molding of the previous process group (S1 to S6), and in the subsequent drilling process S7 and the process group after drilling (S8 to S10), the second part (52g) is molded into a cylindrical shape. In addition, a step (56h) is generated at the boundary between the first part (51h) and the second part (52h).

そして、穴あけ前の工程群(S1〜S6)において既に第1部(51f)の厚み(t1)と第2部(52f)の厚み(t2)とに差を生じさせているため、穴あけ後の工程群(S8〜S10)において段差(56h)を容易に生み出すことができている。   And in the process group (S1 to S6) before drilling, since the thickness (t1) of the first part (51f) and the thickness (t2) of the second part (52f) are already generated, A step (56h) can be easily generated in the process group (S8 to S10).

また、円筒状の第1部(51a・・・51e)に対して、穴あけ前の工程群(S1〜S6)における第2部(52a・・・52e)が直交しているため、円筒状の第1部(51a・・・51e)の軸方向に沿って金型を動かすプレス成形を行っている場合において、第2部(52a・・・52e)の厚みを薄くすることが容易になっている。   Moreover, since the 2nd part (52a ... 52e) in the process group (S1-S6) before drilling is orthogonal to the cylindrical 1st part (51a ... 51e), it is cylindrical. In the case where press molding is performed to move the mold along the axial direction of the first part (51a... 51e), it is easy to reduce the thickness of the second part (52a... 52e). Yes.

このように、ここでは、穴あけ前の工程群(S1〜S6)における中間成形材の形状(グラス状)が第2部(52a・・・52e)を薄肉化しやすいものとなっており、且つ、穴あけ後の工程群(S8〜S10)で第2部(52g)を円筒状に成形させて第1部(51h)と第2部(52h)との境界に段差(56h)を生じさせることで配管部材を製造している。このため、プレス成形による配管部材60の製造を、歩留まりよく、短時間で行うことができている。そして、プレス成形によって配管部材60を製造することができているため、従来の機械加工による配管部材に較べ、その製造時間が短縮化されている。   Thus, here, the shape (glass shape) of the intermediate molding material in the process group (S1 to S6) before drilling is easy to thin the second part (52a ... 52e), and By forming the second part (52g) into a cylindrical shape in the process group (S8 to S10) after drilling, a step (56h) is generated at the boundary between the first part (51h) and the second part (52h). Manufactures piping members. For this reason, manufacture of the piping member 60 by press molding can be performed in a short time with a high yield. And since the piping member 60 can be manufactured by press molding, the manufacturing time is shortened compared with the piping member by the conventional machining.

(11)
上述の配管部材60の製造方法では、第1絞り工程S1によって、板状素材50を、円筒状の第1部(51a)及びその第1部(51a)の一端を塞ぐ円盤状の第2部(52a)とから成るグラス状の形状に成形し、その後の薄肉化工程群(S2〜S6)によって、第2部(52a)の厚みを薄くしている。このため、薄肉化工程群(S2〜S6)では、円盤状の第2部(52a・・・52e)の上下両面に金型が接触して第2部(52a・・・52e)の板厚方向に力を作用させることができる。このため、最初から円筒状に第2部を成形してから薄肉化するような方法に較べて、第2部(52a・・・52e)の薄肉化が容易に且つ早く行われる。
(11)
In the manufacturing method of the piping member 60 described above, the plate-shaped material 50 is covered with the cylindrical first part (51a) and the disk-shaped second part that closes one end of the first part (51a) by the first drawing step S1. (52a) is formed into a glass-like shape, and the thickness of the second part (52a) is reduced by the subsequent thinning process group (S2 to S6). For this reason, in the thinning process group (S2 to S6), the mold comes into contact with the upper and lower surfaces of the disk-shaped second part (52a... 52e), and the plate thickness of the second part (52a... 52e). A force can be applied in the direction. For this reason, compared with the method of forming the second part into a cylindrical shape from the beginning and then reducing the thickness, the second part (52a... 52e) can be easily and quickly made thinner.

(12)
上述の配管部材60の製造方法では、穴あけ工程S7において第2部(52f)の中央部分を抜き取り、その後に環状になった第2部(52g)を円筒状に成形していくため、円盤状の第2部を円筒状に成形してから不要な部分を切断するような方法に較べて、早く且つ精度よく薄肉円筒状の先端薄肉円筒部62を形成することができている。
(12)
In the manufacturing method of the piping member 60 described above, the center part of the second part (52f) is extracted in the drilling step S7, and then the annular second part (52g) is formed into a cylindrical shape. Compared with the method of cutting the unnecessary portion after forming the second portion into a cylindrical shape, the thin-walled cylindrical tip 62 can be formed quickly and accurately.

また、環状になった第2部(52g)を円筒状に成形する第1仕上絞り工程S8の後に、円筒状になった第2部(52h)に軸方向の圧縮力を作用させる第2仕上絞り工程S9を行っているため、第2部(52h)を先端薄肉円筒部62の最終形状に精度よく仕上げることができている。   In addition, after the first finishing drawing step S8 for forming the annular second part (52g) into a cylindrical shape, the second finishing is performed by applying an axial compressive force to the cylindrical second part (52h). Since the drawing step S9 is performed, the second part (52h) can be accurately finished to the final shape of the thin-walled cylindrical part 62 at the tip.

本実施形態に係る貯湯式給湯機の外観斜視図。The external appearance perspective view of the hot water storage type water heater which concerns on this embodiment. 貯湯式給湯機の概略構成図。The schematic block diagram of a hot water storage type water heater. 貯湯式給湯機の貯湯装置と給湯口,浴槽とを連絡する配管の回路図。The circuit diagram of the piping which connects the hot water storage apparatus of a hot water storage type water heater, a hot water supply port, and a bathtub. 貯湯タンクの上面図。The top view of a hot water storage tank. 図4AのIV-IV矢視断面図。4A is a cross-sectional view taken along the arrow IV-IV in FIG. 4A. 配管部材の縦断面図。The longitudinal cross-sectional view of a piping member. クイックファスナーの正面図。The front view of a quick fastener. 図6AのVI-VI矢視断面図。FIG. 6B is a cross-sectional view taken along the line VI-VI in FIG. 6A. 第1絞り工程の前および後の板状素材の平面図。The top view of the plate-shaped raw material before and after a 1st drawing process. 第1〜第4絞り工程の前および後の板状素材の断面図(図7のIIIV-IIIV矢視断面図に相当)。Sectional drawing of the plate-shaped raw material before and after the 1st-4th drawing process (equivalent to the IIIV-IIIV arrow sectional drawing of FIG. 7). 第5,第6絞り工程、穴あけ工程、第1,第2絞り工程、外径抜き工程の前および後の板状素材の断面図。Sectional drawing of the plate-shaped raw material before and after a 5th, 6th drawing process, a drilling process, the 1st, 2nd drawing process, and an outer diameter extraction process. 従来の配管部材の縦断面図。The longitudinal cross-sectional view of the conventional piping member.

50 板状素材
51a・・・51j 第1部
52a・・・52f 第2部(底部)
53b・・・53j 第3部(底部とは反対側の端部近傍部分)
54g 第2部の中央部分
60 配管部材
61 円筒部
63 鍔部
t1 板状素材の厚み,円筒部の厚み
S1 第1絞り工程(第1ステップ)
S2 第2絞り工程(第2ステップ)
S3 第3絞り工程(第2ステップ)
S4 第4絞り工程(第2ステップ)
S5 第5絞り工程(第2ステップ)
S6 第6絞り工程(第2ステップ)
S7 穴あけ工程
50 Plate-like material 51a ... 51j 1st part 52a ... 52f 2nd part (bottom part)
53b ... 53j 3rd part (end part vicinity part on the opposite side to a bottom part)
54g Central part of the second part 60 Piping member 61 Cylindrical part 63 ridge part t1 Thickness of plate-shaped material, thickness of cylindrical part S1 First drawing step (first step)
S2 Second drawing step (second step)
S3 Third throttle step (second step)
S4 Fourth throttle step (second step)
S5 Fifth drawing process (second step)
S6 Sixth drawing step (second step)
S7 Drilling process

Claims (4)

円筒部(61)及び前記円筒部の一端から径方向外方に延びる鍔部(63)が一体となっている配管部材(60)の製造方法であって、
板状素材(50)を、プレス成形によって、円筒状の第1部(51a)を含む初期形状に成形する、第1ステップ(S1)と、
前記初期形状となった成形中間材の前記第1部の端部近傍部分である第3部(53b)を湾曲させて径方向外方に延ばし、前記第1部を前記円筒部及び前記鍔部に成形する、1又は複数のプレス成形工程から成る第2ステップ(S2〜S6)と、
を備え
前記第2ステップは、
前記第3部を水平方向に近づくようにプレス成形する、プレス成形工程(S3)と、
水平方向に近づいた前記第3部が、途中で上を向くように、前記第3部の先端側の部分を逆側に湾曲させる、プレス成形工程(S4)と、
上を向いた前記第3部の先端が、水平方向に近づくように、前記第3部の先端部分を外方に曲げる、プレス成形工程(S5)と、
を含み、
前記第2ステップでは、前記第3部に段差(57e)を形成することにより、前記第3部において、前記円筒部の軸方向に段ができ、且つ、前記円筒部の径方向にも段ができる、
配管部材の製造方法。
A manufacturing method of a pipe member (60) in which a cylindrical portion (61) and a flange portion (63) extending radially outward from one end of the cylindrical portion are integrated,
A first step (S1) for forming the plate-like material (50) into an initial shape including a cylindrical first portion (51a) by press molding;
The third part (53b), which is a part near the end of the first part of the molded intermediate material having the initial shape , is curved and extended radially outward, and the first part is the cylindrical part and the flange part. A second step (S2 to S6) consisting of one or a plurality of press molding processes,
Equipped with a,
The second step includes
Press-molding the third part so as to approach the horizontal direction (S3);
A press molding step (S4) for curving the tip side portion of the third part to the opposite side so that the third part approaching the horizontal direction faces upward in the middle;
A press-molding step (S5) for bending the tip portion of the third part outward so that the tip of the third part facing upward approaches the horizontal direction;
Including
In the second step, by forming a step (57e) in the third part, a step is formed in the axial direction of the cylindrical part in the third part, and a step is also provided in the radial direction of the cylindrical part. it can,
Manufacturing method of piping member.
前記第1ステップでは、前記板状素材を、前記第1部及び円盤状の底部(52a)を含む断面が凹状の初期形状に成形し、
第2ステップの後に、前記底部の中央部分(54g)を切り離す第3ステップ(S7)をさらに備えた、
請求項1に記載の配管部材の製造方法。
In the first step, the plate-shaped material is molded into an initial shape having a concave cross section including the first part and the disk-shaped bottom part (52a),
After the second step, further comprising a third step (S7) for cutting off the central portion (54g) of the bottom,
The manufacturing method of the piping member of Claim 1 .
前記板状素材が、クロム(Cr)含有量が17〜20%、モリブデン(Mo)含有量が1.7〜2.5%、炭素(C)含有量が0.03以下のフェライト系ステンレス鋼である、
請求項1又は2に記載の配管部材の製造方法。
Ferritic stainless steel in which the plate material has a chromium (Cr) content of 17 to 20%, a molybdenum (Mo) content of 1.7 to 2.5%, and a carbon (C) content of 0.03 or less. Is,
The manufacturing method of the piping member of Claim 1 or 2 .
前記板状素材として、2mm以下の厚みの素材を用いる、
請求項3に記載の配管部材の製造方法。
As the plate material, a material having a thickness of 2 mm or less is used.
The manufacturing method of the piping member of Claim 3 .
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