JPH01237114A - Manufacture of metal composite tube - Google Patents
Manufacture of metal composite tubeInfo
- Publication number
- JPH01237114A JPH01237114A JP63065047A JP6504788A JPH01237114A JP H01237114 A JPH01237114 A JP H01237114A JP 63065047 A JP63065047 A JP 63065047A JP 6504788 A JP6504788 A JP 6504788A JP H01237114 A JPH01237114 A JP H01237114A
- Authority
- JP
- Japan
- Prior art keywords
- metal tube
- tube
- synthetic resin
- metal
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002905 metal composite material Substances 0.000 title claims description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 91
- 239000002184 metal Substances 0.000 claims abstract description 91
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 45
- 239000000057 synthetic resin Substances 0.000 claims abstract description 45
- 230000002093 peripheral effect Effects 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 11
- 238000001125 extrusion Methods 0.000 abstract description 7
- 238000003825 pressing Methods 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 230000032258 transport Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
- B29C48/152—Coating hollow articles the inner surfaces thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、外周側が金属管、内周側が合成樹脂層で被
覆された金属複合管を製造するに際し、金属管内周側に
合成樹脂層を均一な厚さに、被覆する金属複合管の製造
方法に関する。Detailed Description of the Invention (Industrial Field of Application) This invention provides a method for manufacturing a metal composite tube in which the outer circumferential side is covered with a metal tube and the inner circumferential side is coated with a synthetic resin layer. The present invention relates to a method of manufacturing a metal composite pipe coated with a uniform thickness.
（従来の技術）
給湯用、温水暖房用等の配管材料として、金属管内周面
に合成樹脂層が被覆された金属複合管が使用されている
。(Prior Art) A metal composite pipe whose inner peripheral surface is coated with a synthetic resin layer is used as a piping material for hot water supply, hot water heating, etc.
このような金属複合管Ｆは、その製造工程の概要を第５
図に示すように、帯状の金属シー）Ａを円管に成形する
際に、成形された金属シート製円管の内側から溶融した
合成樹脂を円筒状に押出して、円管内周面を合成樹脂層
で被覆することにより、製造される。The manufacturing process for such a metal composite pipe F is summarized in the fifth section.
As shown in the figure, when forming the band-shaped metal sheet (A) into a circular tube, molten synthetic resin is extruded from the inside of the formed metal sheet circular tube into a cylindrical shape, and the inner peripheral surface of the circular tube is made of synthetic resin. Manufactured by coating with layers.
金属管Ｂは、冷間にて、金属シートＡを成形ロールＣに
より円管状に成形し、その側縁部同志を高周波熔接機り
などで熔接することにより、連続的に製造される。The metal tube B is continuously produced by cold forming the metal sheet A into a circular tube shape using a forming roll C, and welding the side edges together using a high-frequency welding machine or the like.
金属シー１−Ａは、例えば、その搬送方向に並設された
多数本の成形ロールＣを通過することにより、その断面
が偏平な円弧状から円管状となるように、順次湾曲加工
が施される。For example, the metal sheet 1-A is sequentially curved so that its cross section changes from a flat arc shape to a circular tube shape by passing through a number of forming rolls C arranged in parallel in the conveyance direction. Ru.
各成形ロールＣは、上下に対をなす、周面が弧状に突出
した凸型ロールと周面が弧状に窪んだ凹型ロールを有し
、両者は間隙を有するように嵌合されて、回転駆動され
る。Each forming roll C has a convex roll whose circumferential surface protrudes in an arc shape and a concave roll whose circumferential surface is concave in an arc shape, forming a pair of upper and lower sides, and both are fitted with a gap and driven to rotate. be done.
そして、この間隙内を金属シー）Ａが通過することによ
り、所定の断面形状に成形される。Then, by passing the metal sheet (A) through this gap, it is formed into a predetermined cross-sectional shape.
金属管Ｂ内周面の合成樹脂被覆は、例えば金属シートＡ
をその断面が偏平な円弧状から円管に成形する際に、溶
融した合成樹脂を押出す金型先端部Ｅを、成形された円
管内の所定の位置に配設し、この金型先端部Ｅから溶融
した合成樹脂を円筒状に押出して、円管内周面に接着す
ることにより行われる。尚、Ｇは金属管Ｂの断面を真円
に矯正する矯正ロールである。The synthetic resin coating on the inner peripheral surface of the metal tube B is, for example, a metal sheet A.
When molding from an arc shape with a flat cross section into a circular tube, a mold tip E for extruding the molten synthetic resin is placed at a predetermined position inside the molded circular tube, and this mold tip This is done by extruding a molten synthetic resin from E into a cylindrical shape and adhering it to the inner peripheral surface of the cylindrical tube. Note that G is a straightening roll that straightens the cross section of the metal tube B into a perfect circle.
（発明が解決しようとする課題）
しかしながら、上記方法は金属シートを、冷間にて、一
対の凸型ロールと凹型ロールとからなる各成形ロールの
間に導入して、両ロールで拘束しながら強制的に湾曲す
るため、円管状に成形された金属シートには、残留応力
が蓄積するので、この円管状の金属シートの側縁部同志
を突き合わせ熔接する場合は、側縁部同志が離れないよ
うに、側部より圧接しながら、熔接する必要があり、こ
のため、熔接直後の金属管の断面は、圧接する際の圧力
と金属シートに蓄積した残留応力とが作用して圧接力を
与えた方向に幅が狭まった縦長の形状となり、この状態
が矯正されることなく、金属管内周面に合成樹脂層を被
覆する場合、合成樹脂層の周方向での厚さのばらつきが
大きくなる。(Problem to be Solved by the Invention) However, in the above method, a metal sheet is introduced in a cold state between each forming roll consisting of a pair of convex rolls and a concave roll, and is restrained by both rolls. Due to the forced bending, residual stress accumulates in a metal sheet formed into a circular tube shape, so when the side edges of the circular tube-shaped metal sheets are butted together and welded, the side edges do not separate. As such, it is necessary to weld while pressing from the sides. Therefore, the cross section of the metal tube immediately after welding is affected by the pressure during welding and the residual stress accumulated in the metal sheet, which exerts a welding force. If this condition is not corrected and the inner peripheral surface of the metal tube is coated with a synthetic resin layer, the thickness of the synthetic resin layer in the circumferential direction will vary greatly.
ばらつきが大きいと、一番薄い樹脂層の部分で耐久性（
耐ブリスター性）が決まるので、その分だけ耐久性に劣
ることになる。If the variation is large, the durability (
Blister resistance) is determined, so the durability will be inferior by that much.
この厚さのばらつきを解消するために、熔接後の金属管
の断面形状を真円に矯正した後、その内周面に合成樹脂
層を被覆する方法が行われる。In order to eliminate this variation in thickness, a method is used in which the cross-sectional shape of the welded metal tube is corrected to a perfect circle, and then the inner peripheral surface is coated with a synthetic resin layer.
このために、対をなす成形ロールを、矯正しようとする
二方向から圧接して、その断面形状を真円に矯正するが
、所望の真円状断面を得るには三組以上の成形ロールを
並設して使用する必要があり、その設置長さが管軸方向
で１ｍ以上に達する。For this purpose, a pair of forming rolls are pressed against each other from two directions to correct the cross-sectional shape into a perfect circle, but in order to obtain the desired perfect circular cross-section, three or more sets of forming rolls are required. It is necessary to use them in parallel, and the installation length reaches 1 m or more in the direction of the tube axis.
金属管内周面に合成樹脂を被覆する金型の基端部は、金
属シートが円管状に閉塞される前段階の断面形状が円弧
状である金属シートの内側に挿入され、金型の先端部は
上記三組以上の成形ロールの下流側（金属シートの搬送
方向に対して）に設置されることになり、金型の長さが
管軸方向に長くなる。しかも、金型の先端部及び中間部
は閉塞された金属管内に位置するので、その先端部及び
中間部を支持することができず、金型はその基端部にお
いてのみ、片持状態で支持されることになり、金型の自
重と金型内を移動する合成樹脂の重ｌとにより、金型に
撓みが生じることがある。The proximal end of the mold, which coats the inner peripheral surface of the metal tube with synthetic resin, is inserted inside the metal sheet whose cross-sectional shape is arcuate before the metal sheet is closed into a circular tube shape, and the distal end of the mold is installed downstream of the three or more sets of forming rolls (with respect to the conveyance direction of the metal sheet), and the length of the mold becomes longer in the tube axis direction. Moreover, since the distal end and intermediate part of the mold are located inside a closed metal tube, the distal end and intermediate part cannot be supported, and the mold is supported in a cantilevered state only at its proximal end. As a result, the mold may be bent due to its own weight and the weight of the synthetic resin moving within the mold.
この金型の撓みにより、周方向での押出し抵抗に差が生
じて、溶融した合成樹脂を金型から均一な厚さの円筒状
に押出すことができず、金属管内周面に均一な厚さの合
成樹脂層を被覆することができないという問題点があっ
た。This bending of the mold causes a difference in extrusion resistance in the circumferential direction, making it impossible to extrude the molten synthetic resin from the mold into a cylindrical shape with a uniform thickness. There was a problem in that it was not possible to cover the synthetic resin layer.
また、金型の長さが長くなることにより、金型内の押出
し圧を高めなければ、合成樹脂溶融物を押出すことがで
きないという問題点もあった。Furthermore, due to the increased length of the mold, there was a problem in that the synthetic resin melt could not be extruded unless the extrusion pressure within the mold was increased.
更に、金型の長さが長くなることにより、金型内を移動
する合成樹脂溶融物の温度が制御しにくくなるという問
題点もあった。Furthermore, as the length of the mold becomes longer, there is also the problem that it becomes difficult to control the temperature of the synthetic resin melt moving within the mold.
（課題を解決するための手段）
この発明の金属複合管の製造方法は、上記問題点を解決
するためになされたものであり、帯状の金属シートを断
面が略円弧状から円管状となるように順次湾曲させ、そ
の側縁部同志を熔接して金属管に成形し、その内周面に
溶融樹脂を円筒状に押出して、金属管内周面を合成樹脂
層で被覆することにより複合管を製造する方法において
、前記金属管の周りを囲むように所定の真円の円周にほ
ぼ一致する外周面を有する複数の鼓形ロールを配置し、
これら鼓形ロールを前記金属管の外周面に圧接すること
により、円管の断面を真円に矯正した後、この金属管内
周面に熔融状の合成樹脂を円筒状に押出して、均一な厚
さを有する合成樹脂層が被覆された金属複合管の製造方
法を提供する。(Means for Solving the Problems) The method for manufacturing a metal composite tube of the present invention has been made to solve the above problems, and is made by changing a strip-shaped metal sheet so that its cross section changes from an approximately arc shape to a circular tube shape. A composite tube is made by sequentially bending the tube, welding the side edges together to form a metal tube, extruding molten resin onto the inner circumferential surface of the tube in a cylindrical shape, and coating the inner circumferential surface of the metal tube with a synthetic resin layer. In the manufacturing method, a plurality of drum-shaped rolls having an outer peripheral surface substantially matching the circumference of a predetermined perfect circle are arranged to surround the metal tube,
By pressing these drum-shaped rolls against the outer peripheral surface of the metal tube, the cross section of the circular tube is corrected to a perfect circle, and then molten synthetic resin is extruded onto the inner peripheral surface of the metal tube in a cylindrical shape to achieve a uniform thickness. Provided is a method for manufacturing a metal composite pipe coated with a synthetic resin layer having a
（作用）
この発明の金属複合管の製造方法は、金属管に成形した
あと、この金属管の周りを囲むように配置した複数の鼓
形ロールを金属管の外周面に圧接して、金属管の断面を
真円状に矯正した後、この金属管内周面に溶融状の合成
樹脂層を押出し接着するので、均一な厚さの合成樹脂層
を被覆することができる。(Function) The method for manufacturing a metal composite tube of the present invention is to form a metal tube, and then press a plurality of drum-shaped rolls arranged around the metal tube to the outer peripheral surface of the metal tube. After the cross section of the metal tube is corrected to a perfect circle, a molten synthetic resin layer is extruded and bonded to the inner circumferential surface of the metal tube, so that the synthetic resin layer can be coated with a uniform thickness.
（実施例） 以下にこの発明の実施例について説明する。(Example) Examples of the present invention will be described below.
第１図は、この発明の金属複合管の製造方法の一実施例
の概要を示すロール成形装置の正面図、第２図は第１図
に示す実施例の仕上げ鼓形ロールの部分を拡大して示す
正面図、第３図は第２図の側面図、第４図は第１図に示
す実施例の押出し金型の部分を拡大して示す縦断面図で
ある。FIG. 1 is a front view of a roll forming apparatus showing an overview of an embodiment of the method for producing a metal composite pipe of the present invention, and FIG. 2 is an enlarged view of the finishing drum-shaped roll of the embodiment shown in FIG. 3 is a side view of FIG. 2, and FIG. 4 is an enlarged vertical sectional view of a portion of the extrusion die of the embodiment shown in FIG. 1.
この発明の金属複合管の製造方法は、例えば、第１図に
示されるロール成形装置によって実施される。The method for manufacturing a metal composite pipe of the present invention is carried out using, for example, a roll forming apparatus shown in FIG.
このロール成形装置は、リールスタンド６０に捲回され
た金属シート６１の引出し方向に、対をなす粗成形ロー
ル１１及び１２、対をなす中間成形ロール２１及び２２
、熔接機３０．４本の仕上げ鼓形ロール４１．４２．４
３及び４４が、順次、配設されている。This roll forming device includes a pair of rough forming rolls 11 and 12, a pair of intermediate forming rolls 21 and 22, and a pair of intermediate forming rolls 21 and 22 in the direction of pulling out a metal sheet 61 wound on a reel stand 60.
, welding machine 30.4 finished drum rolls 41.42.4
3 and 44 are arranged in sequence.
粗成形ロール１１．１２及び中間成形ロール２１．２２
は、それぞれ、上下に対をなす凸型ロール及び凹型ロー
ルを有し、各ロールは所定の速度にて回転駆動される。Rough forming roll 11.12 and intermediate forming roll 21.22
Each of the rollers has a convex roll and a concave roll arranged in an upper and lower pair, and each roll is driven to rotate at a predetermined speed.
各凸型ロールは、外周面が弧状に突出しており、各凹型
ロールは、この凸型ロールと所定の間隙を有して外嵌し
得るように、外周面が弧状に窪んでいる。Each convex roll has an arcuate outer peripheral surface protruding, and each concave roll has an arcuate recessed outer peripheral surface so that it can be fitted onto the convex roll with a predetermined gap.
金属シート６１の搬送方向に並設された粗成形ロール１
１及び１２は、金属シート６１を比較的偏平な（曲率半
径が大きい）断面円弧状に湾曲させると共に、金属シー
ト６１をリールスタンド６０から引き出して、所定の方
向へ搬送させる。Rough forming rolls 1 arranged in parallel in the conveyance direction of the metal sheet 61
1 and 12 curve the metal sheet 61 into a relatively flat (large radius of curvature) cross-sectional arc shape, pull out the metal sheet 61 from the reel stand 60, and transport it in a predetermined direction.
７１は、搬送ロールであり、金属シート６１を両側から
挟んで対向配設された一対の垂直ロールを有し、各垂直
ロールの周面ば、所定の断面形状に湾曲された金属シー
ト６１の外周面の略半周にわたって、それぞれ転接し得
るように、円弧状となっている。Reference numeral 71 denotes a conveyor roll, which has a pair of vertical rolls facing each other with the metal sheet 61 sandwiched therebetween, and the peripheral surface of each vertical roll is the outer periphery of the metal sheet 61 that is curved into a predetermined cross-sectional shape. They are arcuate so that they can be in contact with each other over approximately half the circumference of the surface.
搬送ロール７１の下流側には、中間成形ロール２１、搬
送ロール７２、中間成形ロール２２、搬送ロール７３及
び７４が、順次、配設されており、各中間成形ロール２
１及び２２は、粗成形ロール１２によって断面が比較的
偏平な円弧状に湾曲された金属シート６１を更に湾曲さ
せて、順次曲率半径が小となるように変形し、最終的に
は円管状となるように成形する。On the downstream side of the conveyance roll 71, intermediate forming rolls 21, conveyance rolls 72, intermediate forming rolls 22, conveyance rolls 73 and 74 are arranged in order, and each intermediate forming roll 2
1 and 22, a metal sheet 61 that has been curved into an arc shape with a relatively flat cross section by the rough forming roll 12 is further curved so that the radius of curvature becomes smaller, and finally it becomes a circular tube shape. Shape it to look like this.
各搬送ロール７２．７３及び７４は、各中間成形ロール
２１及び２２によって、それぞれ、所定の断面形状に湾
曲された金属ソート６１を、それぞれ、断面形状を保持
しつつ下流側へ搬送する。Each of the transport rolls 72, 73 and 74 transports the metal sort 61, which has been curved into a predetermined cross-sectional shape by the intermediate forming rolls 21 and 22, respectively, to the downstream side while maintaining the cross-sectional shape.
搬送ロール７３の下流側には、高周波熔接機３０．４木
の仕上げ鼓形ロール４１．４２．４３及び４４が、それ
ぞれ、設置される。On the downstream side of the conveyor roll 73, a high frequency welding machine 30.4 and wooden finishing drum rolls 41, 42, 43 and 44 are installed, respectively.
金属シート６１は、搬送ロール７３にて断面が円形状に
保持されたままで、その側縁部同志が高周波熔接機３０
によって熔接されて、金属管６２に成形される。The metal sheet 61 is held in a circular cross section by the conveyance roll 73, and its side edges are connected to the high frequency welding machine 30.
are welded and formed into a metal tube 62.
次に、金属管６２は、この搬送ロール７４によって、仕
上げ鼓形ロール４１４２．４３．４４へ搬送される。The metal tube 62 is then transported by this transport roll 74 to the finishing drum roll 4142, 43, 44.
仕上げ鼓形ロール４１．４２．４３．４４は、第２図及
び第３図に示されるように、各ロールの外周面が金属管
６２の所定の真円となる外径にほぼ一致する鼓形をして
おり、各ロールは金属管６２の周りを囲むように配置さ
れている。The finished drum-shaped rolls 41, 42, 43, and 44 are drum-shaped, with the outer circumferential surface of each roll approximately matching the outer diameter of the metal tube 62 to form a predetermined perfect circle, as shown in FIGS. 2 and 3. Each roll is arranged so as to surround the metal tube 62.
各ロールの軸芯は金属管６２の横断面に相当する同一面
上に位置しているのが好ましいが、金属管６２の進行方
向に幾分前後して設けられてもよい。仕上げ鼓形ロール
の数は金属管６２の径や仕上げ鼓形ロールの径により変
えられるが、仕上げ鼓形ロールの中央部と端部の速度差
が大きくなると、金属管６２に圧接したとき、金属管６
２表面に擦り傷が発生するので、端部の周長が中央部の
周長の１．２５倍以下となるように、仕上げ鼓形ロール
の数を設定するのがよい。また、仕上げ鼓形ロールは回
転軸を有していてもよいが、軸の周りにロールのみが回
転するようになされている方が、ロールを金属管６２へ
向けて移動する軸受機構を簡単にできる。It is preferable that the axes of each roll are located on the same plane corresponding to the cross section of the metal tube 62, but the rolls may be provided slightly back and forth in the direction of movement of the metal tube 62. The number of finishing drum-shaped rolls can be changed depending on the diameter of the metal tube 62 and the diameter of the finishing drum-shaped roll, but if the speed difference between the center and end of the finishing drum-shaped roll becomes large, when pressed against the metal tube 62, the metal tube 6
2. Since scratches may occur on the surface, it is preferable to set the number of finishing drum-shaped rolls so that the circumferential length of the end portion is 1.25 times or less than the circumferential length of the center portion. Further, the finishing drum-shaped roll may have a rotating shaft, but if only the roll rotates around the shaft, the bearing mechanism for moving the roll toward the metal tube 62 can be easily installed. can.
また、各仕上げ鼓形ロールは、それぞれ、その外周面に
て金属管６２を圧接して、金属管６２を抱持し、各仕上
げ鼓形ロールは圧接する金属管６２の法線方向に移動が
可能なるように配設され、圧接する金属管６２の法線方
向に移動して、この金属管６２の真円からの出張り部分
を押圧することにより、金属管６２の断面形状を真円に
矯正する。Each of the finishing drum-shaped rolls presses the metal tube 62 on its outer circumferential surface and holds the metal tube 62, and each of the finishing drum-shaped rolls can move in the normal direction of the metal tube 62 that it presses against. By moving in the normal direction of the metal tube 62 to be press-contacted and pressing the protruding portion of the metal tube 62 from a perfect circle, the cross-sectional shape of the metal tube 62 is made into a perfect circle. to correct.
金属管６２は、金属管の所定の真円となる外径寸法に相
当する位置に調整された４本の仕上げ鼓形ロール４１．
４２．４３．４４を通過することにより、所定の外径と
真円状の断面形状が付与される。The metal tube 62 is formed by four finishing drum-shaped rolls 41. which are adjusted to a position corresponding to the outer diameter dimension that makes the metal tube a predetermined perfect circle.
By passing through 42, 43, and 44, a predetermined outer diameter and a perfect circular cross-sectional shape are imparted.
金属管６２の内周面の合成樹脂被覆は、第４図に示され
るようなりロスヘッド金型５１を使用して、次の方法で
行われる。The inner peripheral surface of the metal tube 62 is coated with a synthetic resin using a loss head mold 51 as shown in FIG. 4 in the following manner.
この金型５１は、金属シート６１の搬送方向上流側から
基端部５１１、中間部５２１及び先端部５３１の順序で
一体に構成され、基端部５１１にて押出機５０に取着さ
れ、片持状態で支持される。This mold 51 is integrally constructed in the order of a base end 511, an intermediate part 521, and a tip end 531 from the upstream side in the conveyance direction of the metal sheet 61, and is attached to the extruder 50 at the base end 511, and is It is supported in a holding state.
押出機５０より押出された合成樹脂溶融物は、金型５１
の基端部５１１及び中間部５２１を経て、内挿管５５の
先端部５５１のテーパー面５５１ａと金型５１の先端部
５３１のテーパー面５３１ａとにより形成される間隙か
ら、金型５１内を流動する合成樹脂溶融物が円筒状に押
出される。The synthetic resin melt extruded from the extruder 50 is transferred to the mold 51.
The fluid flows through the mold 51 through the proximal end 511 and intermediate portion 521 of the inner tube 55 and the gap formed by the tapered surface 551a of the distal end 551 of the inner tube 55 and the tapered surface 531a of the distal end 531 of the mold 51. The synthetic resin melt is extruded into a cylindrical shape.
金型５１の先端部５３１から押出された合成樹脂溶融体
は、内挿管５５の先端部５５１に達するまでに、断面形
状が真円状に成形された金属管内周面に接着され、この
内周面に均一な厚さにて被覆される。By the time the synthetic resin melt extruded from the distal end 531 of the mold 51 reaches the distal end 551 of the inner tube 55, it is adhered to the inner circumferential surface of the metal tube, which has a perfect circular cross-sectional shape, and this inner circumference The surface is coated with a uniform thickness.
内挿管５５の先端に設けられた円筒状先端部５５１の外
径と金属管６２の内径との間隙により、被覆される合成
樹脂層の厚さが決定される。The thickness of the synthetic resin layer to be coated is determined by the gap between the outer diameter of the cylindrical tip 551 provided at the tip of the inner tube 55 and the inner diameter of the metal tube 62.
金型５１は、その基端部５１１が、金属シート６１がま
だ閉塞される直前の断面が略円弧状である位１に配設さ
れる。そして、その先端部５３１及び中間部５２１は、
金属シート６１が円管状に成形された金属管６２内部に
挿入され、先端部５３１は仕上げ鼓形ロール４１．４２
．４３及び４４の直後に位置するように配設される。The mold 51 is disposed such that its base end 511 has a substantially arcuate cross section just before the metal sheet 61 is closed. The tip portion 531 and the intermediate portion 521 are
A metal sheet 61 is inserted into a metal tube 62 formed into a cylindrical shape, and the tip end 531 is attached to the finishing drum-shaped roll 41, 42.
．． It is arranged so as to be located immediately after 43 and 44.
この発明の金属複合管の製造方法によれば、帯状の金属
シートが多数本の成形ロールにて、断面が略円弧状から
円管状へと湾曲されて成形された金属管の内周面に、押
出機に接続した押出し金型から押出された溶融状の合成
樹脂層を被覆することにより、均一な厚さの合成樹脂層
を内周面に有する金属複合管を、連続的に製造すること
ができる。According to the method for manufacturing a metal composite tube of the present invention, a strip-shaped metal sheet is formed on the inner circumferential surface of a metal tube whose cross section is curved from a substantially arc shape to a circular tube shape using multiple forming rolls. By coating with a molten synthetic resin layer extruded from an extrusion mold connected to an extruder, it is possible to continuously manufacture metal composite tubes that have a uniformly thick synthetic resin layer on the inner peripheral surface. can.
この発明に好適に使用される金属シートは、例えばアル
ミニウムシート、ｉ同シート、鋼シート、ステンレスス
ティールシート、チタンシート等である。Metal sheets suitably used in this invention include, for example, aluminum sheets, aluminum sheets, steel sheets, stainless steel sheets, titanium sheets, and the like.
実験例
厚さ１．５ ＊ｍのアルミニウムシートを用いて、第１
図に示された装置にて、外径が８７１１のアルミニウム
管の内周面に合成樹脂層を被覆した金属複合管を製造し
た。Experimental Example Using an aluminum sheet with a thickness of 1.5*m, the first
Using the apparatus shown in the figure, a metal composite tube was manufactured by coating the inner peripheral surface of an aluminum tube with an outer diameter of 8711 mm with a synthetic resin layer.
尚、合成樹脂を押出す金型の先端部は、仕上げ鼓形ロー
ルの中心より５ｆｌ下流側（アルミニウムシートの搬送
方向に対して）のアルミニウム円管状物の内部に配設し
て、この管状物の内周面に合成樹脂層を被覆した。The tip of the mold for extruding the synthetic resin is placed inside the aluminum cylinder 5 fl downstream from the center of the finishing drum-shaped roll (with respect to the conveyance direction of the aluminum sheet). A synthetic resin layer was coated on the inner circumferential surface of the.
上記金属複合管の外径寸法及び内径寸法を、この複合管
の直径方向に対して３０度の角度毎に、合計１２箇所測
定し、合成樹脂層の厚さのばらつき及び金属複合管内径
の真円変形度を算出した結果、それぞれ、０．１６１及
び０．１％であった。The outer diameter and inner diameter of the metal composite pipe were measured at a total of 12 locations at 30 degree angles with respect to the diameter direction of the composite pipe. The calculated degree of circular deformation was 0.161% and 0.1%, respectively.
尚、真円変形度は次式により計算した。The degree of circular deformation was calculated using the following formula.
厚さ１．５Ｈのアルミニウム製シートを用いて、仕上げ
鼓形ロールを使用せず、それ以外は、実験例と同様な方
法にて、外径８７ｍｍの金属複合管を製造した。A metal composite tube with an outer diameter of 87 mm was manufactured using an aluminum sheet having a thickness of 1.5H and using the same method as in the experimental example except that the finishing drum-shaped roll was not used.
上記金属複合管の内径寸法を実験例と同様に測定し、合
成樹脂層の厚さのばらつき及び真円変形度として、それ
ぞれ、０．５０ ｉｎ、２．６％の数値を得た。The inner diameter dimension of the metal composite tube was measured in the same manner as in the experimental example, and values of 0.50 inch and 2.6% were obtained as the variation in the thickness of the synthetic resin layer and the degree of circular deformation, respectively.
上記実験例及び比較例の結果を下表に示す。The results of the above experimental examples and comparative examples are shown in the table below.
表
（発明の効果）
この発明の金属複合管の製造方法は、上記のような構成
となされているので、金属管が、外周面を圧接される四
本の仕上げ鼓形ロールを一回通過するのみで、その断面
形状を真円に矯正することができる。従って、仕上げ鼓
形ロールの設置スペースを大幅に節減することができ、
金型の長さを短縮することができる。Table (Effects of the Invention) Since the method for manufacturing a metal composite pipe of the present invention is configured as described above, the metal pipe passes once through four finishing drum-shaped rolls whose outer peripheral surfaces are pressed together. The cross-sectional shape can be corrected to a perfect circle using a chisel. Therefore, the installation space for the finishing drum-shaped roll can be significantly reduced.
The length of the mold can be shortened.
その結果、片持ち状態で支持される金型の撓みが小さく
なると同時に、金型内の合成樹脂温度を均一に制御すこ
とができるので、金属管内周面に均一な厚さの合成樹脂
層を形成することができる。As a result, the deflection of the mold supported in a cantilevered state is reduced, and at the same time, the temperature of the synthetic resin inside the mold can be controlled uniformly, allowing a synthetic resin layer of uniform thickness to be formed on the inner peripheral surface of the metal tube. can be formed.
また、仕上げ鼓形ロールにより、金属管の断面形状を真
円に矯正した直後に、その内周面に合成樹脂層を被覆す
るので、合成樹脂層が均一な厚さとなり、安定した性能
をもつ金属複合管を提供することができる。In addition, immediately after the cross-sectional shape of the metal tube is corrected to a perfect circle using a finishing drum-shaped roll, the inner peripheral surface is coated with a synthetic resin layer, so the synthetic resin layer has a uniform thickness and has stable performance. A metal composite tube can be provided.
更に、均一な厚さの合成樹脂層により、金属管の内径が
真円状となるので、内径真円度が向上し、継手との水密
性が向上する。Furthermore, the uniform thickness of the synthetic resin layer makes the inner diameter of the metal tube a perfect circle, which improves the roundness of the inner diameter and improves watertightness with the joint.
第１図は、この発明の金属複合管の製造方法の実施例の
概要を示すロール成形装置の正面図、第２図は第１図に
示す実施例の仕上げ鼓形ロールの部分を拡大して示す正
面図、第３図は第２図の側面図、第４図は第１図に示す
実施例の押出し金型の部分を拡大して示す縦断面図、第
５図は従来の金属複合管の製造工程を示す概要図である
。
１１．１２・・−粗成形ロール、 ２１． ２２−中
間成形ロール、３０−熔接機、４１，４２，４３゜４４
−仕上げ鼓形ロール、７１．７２，７３，７４−搬送ロ
ール、５１〜押出し金型、５５−内挿管、６１〜・金属
シート、６２・・・金属管。
第２図
第３図
Ｉ
第４図FIG. 1 is a front view of a roll forming apparatus showing an outline of an embodiment of the method for manufacturing metal composite pipes of the present invention, and FIG. 2 is an enlarged view of the finished drum-shaped roll of the embodiment shown in FIG. 1. 3 is a side view of FIG. 2, FIG. 4 is an enlarged vertical sectional view of the extrusion die of the embodiment shown in FIG. 1, and FIG. 5 is a conventional metal composite pipe. FIG. 2 is a schematic diagram showing the manufacturing process. 11.12...-Rough forming roll, 21. 22-Intermediate forming roll, 30-Welding machine, 41, 42, 43° 44
- Finishing drum-shaped roll, 71, 72, 73, 74 - Conveyance roll, 51 - Extrusion mold, 55 - Insertion tube, 61 - Metal sheet, 62 - Metal tube. Figure 2 Figure 3 I Figure 4
Claims (1)
るように順次湾曲させ、その側縁部同志を熔接して金属
管に成形し、その内周面に溶融合成樹脂を円筒状に押出
して、金属管内周面を合成樹脂層で被覆することにより
複合管を製造する方法において、前記金属管の周りを囲
むように所定の真円の周面にほぼ一致する外周面を有す
る複数の鼓形ロールを配置し、これら鼓形ロールを前記
金属管の外周面に圧接することにより、金属管の断面を
真円に矯正した後、金属管内周面に合成樹脂層を被覆す
ることを特徴とする金属複合管の製造方法。1. Sequentially curve a band-shaped metal sheet so that the cross section changes from an approximately arc shape to a circular tube shape, weld the side edges together to form a metal tube, and apply molten synthetic resin to the inner peripheral surface to form a cylindrical shape. In a method of manufacturing a composite tube by extruding and coating the inner circumferential surface of the metal tube with a synthetic resin layer, a plurality of tubes having outer circumferential surfaces substantially matching the circumferential surface of a predetermined perfect circle surround the metal tube. The method is characterized in that the cross section of the metal tube is corrected to a perfect circle by arranging hourglass-shaped rolls and press-contacting these hourglass-shaped rolls to the outer circumferential surface of the metal tube, and then the inner circumferential surface of the metal tube is coated with a synthetic resin layer. A method for manufacturing a metal composite pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63065047A JPH01237114A (en) | 1988-03-17 | 1988-03-17 | Manufacture of metal composite tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63065047A JPH01237114A (en) | 1988-03-17 | 1988-03-17 | Manufacture of metal composite tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01237114A true JPH01237114A (en) | 1989-09-21 |
Family
ID=13275657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63065047A Pending JPH01237114A (en) | 1988-03-17 | 1988-03-17 | Manufacture of metal composite tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01237114A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04232015A (en) * | 1990-05-17 | 1992-08-20 | Impact Internatl Pty Ltd | Manufacture of laminated cylindrical product |
| KR100487721B1 (en) * | 2002-11-19 | 2005-05-11 | 배경철 | Method and apparatus for making metal-clad pipe |
| JP2011521790A (en) * | 2008-06-06 | 2011-07-28 | アイゼンバウ クレーマー ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for manufacturing large steel pipes |
| CN102500662A (en) * | 2011-11-09 | 2012-06-20 | 燕山大学 | Whole diameter rounding method for large pipe fitting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49123965A (en) * | 1973-03-05 | 1974-11-27 | ||
| JPS60247404A (en) * | 1984-05-24 | 1985-12-07 | Kawasaki Steel Corp | Continuous pipe drawing rolling mill |
| JPS6195922A (en) * | 1984-10-18 | 1986-05-14 | Sekisui Chem Co Ltd | Manufacturing device of composite pipe of metal and plastic |
| JPS62176611A (en) * | 1985-10-15 | 1987-08-03 | Nisshin Steel Co Ltd | Manufacture of thin metal tube |
-
1988
- 1988-03-17 JP JP63065047A patent/JPH01237114A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49123965A (en) * | 1973-03-05 | 1974-11-27 | ||
| JPS60247404A (en) * | 1984-05-24 | 1985-12-07 | Kawasaki Steel Corp | Continuous pipe drawing rolling mill |
| JPS6195922A (en) * | 1984-10-18 | 1986-05-14 | Sekisui Chem Co Ltd | Manufacturing device of composite pipe of metal and plastic |
| JPS62176611A (en) * | 1985-10-15 | 1987-08-03 | Nisshin Steel Co Ltd | Manufacture of thin metal tube |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04232015A (en) * | 1990-05-17 | 1992-08-20 | Impact Internatl Pty Ltd | Manufacture of laminated cylindrical product |
| KR100487721B1 (en) * | 2002-11-19 | 2005-05-11 | 배경철 | Method and apparatus for making metal-clad pipe |
| JP2011521790A (en) * | 2008-06-06 | 2011-07-28 | アイゼンバウ クレーマー ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for manufacturing large steel pipes |
| CN102500662A (en) * | 2011-11-09 | 2012-06-20 | 燕山大学 | Whole diameter rounding method for large pipe fitting |
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