JP6546684B1 - Method of manufacturing bent pipe - Google Patents
Method of manufacturing bent pipe Download PDFInfo
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- JP6546684B1 JP6546684B1 JP2018197571A JP2018197571A JP6546684B1 JP 6546684 B1 JP6546684 B1 JP 6546684B1 JP 2018197571 A JP2018197571 A JP 2018197571A JP 2018197571 A JP2018197571 A JP 2018197571A JP 6546684 B1 JP6546684 B1 JP 6546684B1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000005452 bending Methods 0.000 claims abstract description 96
- 230000002093 peripheral effect Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 50
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000004033 diameter control Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 210000000078 claw Anatomy 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910018131 Al-Mn Inorganic materials 0.000 description 1
- 229910018461 Al—Mn Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
【課題】断面視で曲げパイプの曲管部に設けられるバルジの直径方向と前記曲管部に続く直管部の軸方向とが平行になるように構成される場合において、前記バルジの前記曲管部側の端面と前記直管部の外周面との間の隙間を小さくすることができる曲げパイプの製造方法を提供することにある。【解決手段】座ぐりされた段差部９０ｂを備えたパンチ９０の先端面９０ｅを下部面４０ｃに当接させることにより、曲管部３ｃの第２直管部３ｂに近い側の所定位置の拡径されたままの外径ｄ5を、段差部９０ｂの内周面９０ｆに向かって径方向外向きにさらに膨張させて、バルジを曲管部３ｃに第１直管部３ａの軸方向と平行な方向を向き、かつ、第１直管部３ａの外周に接するように一体形成する。【選択図】図８The bending of the bulge is configured so that the diameter direction of the bulge provided in the bent pipe portion of the bending pipe and the axial direction of the straight pipe portion following the bent pipe portion are parallel to each other in a cross-sectional view. An object of the present invention is to provide a method of manufacturing a bent pipe capable of reducing the gap between the end face on the side of the pipe portion and the outer peripheral surface of the straight pipe portion. An end face 90e of a punch 90 having a countersunk stepped portion 90b is brought into contact with a lower surface 40c, thereby expanding a predetermined position on a side near the second straight pipe portion 3b of the curved pipe portion 3c. The outer diameter d5 as it is diameter is further expanded radially outward toward the inner peripheral surface 90f of the stepped portion 90b, so that the bulge is parallel to the curved pipe portion 3c and the axial direction of the first straight pipe portion 3a. It is integrally formed so as to face the direction and to be in contact with the outer periphery of the first straight pipe portion 3a. [Selected figure] Figure 8
Description
本発明は、例えば、ターボエンジン車のインタークーラーに使用される曲げパイプの製造方法に関するものである。 The present invention relates to, for example, a method of manufacturing a bent pipe used in an intercooler of a turbo engine vehicle.
近年、自動車のエンジンルーム内の複雑かつ高密度化に対応して、ターボエンジン車のインタークーラーに使用される冷却水を流す曲げパイプの曲管部が配置される空間は非常に狭く、曲率半径の小さな物が望まれている。このような要望に応える曲げパイプとして、例えば、特許文献１に記載されたような技術が知られている。特許文献１の図３に示されるように、曲げパイプの外径１７．３ｍｍに対して、曲管部の曲率半径Ｒ２が１２ｍｍと非常に小さくなっている（段落００２２参照）。 In recent years, in response to the increasing complexity and high density in the engine room of automobiles, the space in which the bent pipe portion of the bent pipe for flowing the cooling water used for the intercooler of a turbo engine car is disposed is very narrow, with a curvature radius Small things are desired. For example, a technique as described in Patent Literature 1 is known as a bending pipe that meets such a demand. As shown in FIG. 3 of Patent Document 1, the radius of curvature R2 of the bent pipe portion is very small at 12 mm with respect to the outer diameter 17.3 mm of the bent pipe (see paragraph 0022).
上記特許文献１の図３に示された曲げパイプの曲管部の曲率半径は、非常に小さくなっている。しかし、近年は、さらにボンネットとインタークーラー本体との狭い隙間に収まる、高さを抑えた曲げパイプが切望されるようになってきている。ところが、つば部が第１直管部の位置に形成されているため、第１直管部をインタークーラー本体内に差し込んだ場合、つば部の曲管部側の面と第２直管部の外周面との間に隙間が発生してしまうという問題点があった。すなわち、曲げパイプが、ボンネットとインタークーラー本体との狭い空間に収まらない虞がある。 The radius of curvature of the bent pipe portion of the bent pipe shown in FIG. 3 of Patent Document 1 is very small. However, in recent years, there has been a strong demand for a bent pipe with a reduced height which fits into a narrow gap between the bonnet and the intercooler body. However, since the collar portion is formed at the position of the first straight pipe portion, when the first straight pipe portion is inserted into the intercooler main body, the surface on the curved pipe portion side of the collar portion and the outer periphery of the second straight pipe portion There is a problem that a gap is generated between the surface and the surface. That is, there is a risk that the bent pipe may not fit in the narrow space between the bonnet and the intercooler main body.
本発明の目的は、断面視で曲げパイプの曲管部に設けられるバルジの直径方向と前記曲管部に続く直管部の軸方向とが平行になるように構成される場合において、前記バルジの前記曲管部側の端面と前記直管部の外周面との間の隙間を小さくすることができる曲げパイプの製造方法を提供することにある。 An object of the present invention is that, in a case where a diameter direction of a bulge provided in a bent pipe portion of a bent pipe in a cross sectional view and an axial direction of a straight pipe portion following the bent pipe portion are parallel to each other It is an object of the present invention to provide a method of manufacturing a bent pipe capable of reducing the gap between the end face of the curved pipe portion and the outer peripheral surface of the straight pipe portion.
この目的を達成するために、第１発明に係る曲げパイプの製造方法は、
パイプ素管に曲げ加工を施し、前記パイプ素管の一方の端部側に第１直管部、前記パイプ素管の他方の端部側に第２直管部をそれぞれ残しつつ、前記第１直管部と前記第２直管部との間に湾曲部を形成し、曲げパイプ中間体を製作する仮曲げ工程と、
最終的に得ようとする曲げパイプの曲管部の形状に成形するための空洞部を備えた成形型に前記曲げパイプ中間体を配置し、前記第１および第２直管部の少なくともいずれかの一方の管端から所定の形状を有するストライク曲げＲ矯正用ピン治具を挿入し、前記湾曲部の曲げ外側部の曲面を径方向外向きに拡大させるとともに、前記湾曲部の曲げ内側部の曲面も径方向外向きに拡大させて、前記曲管部の形状に成形するストライク曲げＲ矯正工程と、
前記第１直管部と前記曲管部とを収容する第１空洞部と、前記曲管部の前記第２直管部に近い側の所定位置に対応し、かつ、前記第２直管部の外径より大きな内径になるように座ぐりされ、断面視で奥側に前記第１直管部の軸方向と平行な下部面を有した第２空洞部と、を有した割型状のクランプ型で、前記ストライク曲げＲ矯正工程後の前記曲管部の少なくとも前記第１直管部に近い側に位置する部分と前記第１直管部とのそれぞれの外周を固定する外周固定工程と、
前記曲管部の前記第２直管部に近い側の前記所定位置の前記第１直管部と平行な方向を向く第１外径と前記第２直管部の外径とが前記第２直管部の外径より大きくなるような拡管部に形成する拡管部形成工程と、
前記拡管部の前記曲管部側の前記所定位置の外径をそのまま維持し、前記拡管部の前記所定位置以外の部分の外径を前記拡管部形成工程前の前記第２直管部の外径まで縮径する外径調整工程と、
前記外径調整工程後の前記第２直管部の内径以下の外径を有したピンが内蔵され、入口に最終的に得ようとする曲げパイプのバルジの外径に対応した内径で所定の深さに座ぐりされ設けられた段差部と、前記段差部より奥に前記ピンと径方向に所定の間隙を有した有底筒状部と、を備えたパンチを、前記クランプ型の外に突出した前記第２直管部の管端と離間した状態で対向させ、前記所定の間隙に前記第２直管部を挿入し、前記パンチの前記第２直管部の管端側を向く先端面を前記第２空洞部の前記下部面に当接させることにより、前記曲管部の前記第２直管部に近い側の前記所定位置の前記拡径されたままの外径を、前記段差部の内周面に向かって径方向外向きにさらに膨張させて、前記バルジを前記曲管部に前記第１直管部の軸方向と平行な方向を向き、かつ、前記第１直管部の外周に接するように一体形成するバルジ形成工程と、
を備えることを特徴とする。
In order to achieve this object, a method of manufacturing a bent pipe according to the first invention is:
The pipe base pipe is subjected to a bending process, and the first straight pipe portion on one end side of the pipe base pipe, and the second straight pipe portion on the other end side of the pipe base pipe, respectively, Forming a curved portion between a straight pipe portion and the second straight pipe portion to produce a bent pipe intermediate body;
The bent pipe intermediate body is disposed in a mold provided with a cavity for forming the shape of a bent pipe portion of a bent pipe to be finally obtained, and at least one of the first and second straight pipe portions A pin jig for strike bending R correction having a predetermined shape is inserted from one of the tube ends, and the curved surface of the bending outer portion of the curved portion is expanded radially outward, and the bending inner portion of the curved portion A strike bending R correction process in which a curved surface is also expanded radially outward and is formed into the shape of the curved tube portion;
The second straight pipe portion corresponds to a first hollow portion that accommodates the first straight pipe portion and the curved pipe portion, and a predetermined position on the side closer to the second straight pipe portion of the curved pipe portion. And a second hollow portion having a lower surface parallel to the axial direction of the first straight pipe portion at the back side in cross section. An outer periphery fixing step of fixing the respective outer peripheries of a portion of the bent pipe portion positioned at least near the first straight pipe portion after the strike bending R correction step and a clamp type, and an outer periphery of the first straight pipe portion; ,
The first outer diameter facing the direction parallel to the first straight pipe portion and the outer diameter of the second straight pipe portion of the predetermined position on the side closer to the second straight pipe portion of the curved pipe portion are the second An expanded tube portion forming step of forming the expanded tube portion to be larger than the outer diameter of the straight tube portion;
The outer diameter of the predetermined position on the side of the curved pipe portion of the expanded pipe portion is maintained as it is, and the outer diameter of the portion other than the predetermined position of the expanded pipe portion is outside the second straight pipe portion before the expanded pipe portion forming step. An outer diameter adjusting step of reducing the diameter to a diameter;
A pin having an outer diameter equal to or smaller than the inner diameter of the second straight pipe portion after the outer diameter adjusting step is incorporated, and an inner diameter corresponding to an outer diameter of a bulge of a bending pipe to be finally obtained at the inlet is predetermined. A punch having a stepped portion spotted at a depth and a bottomed cylindrical portion having a predetermined gap in the radial direction with the pin at the back of the stepped portion protrudes out of the clamp die And the second straight pipe portion is inserted into the predetermined gap, and a tip surface facing the tube end side of the second straight pipe portion of the punch. The outer diameter of the predetermined position at the predetermined position closer to the second straight pipe portion of the curved pipe portion is kept by contacting the lower surface of the second hollow portion with the stepped portion. Further radially outward toward the inner circumferential surface of the first straight pipe portion in the axial direction of the first straight pipe portion. Orientation row direction, and a bulge forming step of integrally formed in contact with the outer circumference of the first straight pipe portion,
And the like.
上記構成により、断面視で曲げパイプの曲管部に設けられるバルジの直径方向と前記曲管部に続く直管部の軸方向とが平行になるように構成される場合において、前記バルジの前記曲管部側の端面と前記直管部の外周面との間の隙間を小さくすることができる曲げパイプの製造方法を提供することが可能である。 According to the above configuration, when the diameter direction of the bulge provided in the bent pipe portion of the bent pipe is configured to be parallel to the axial direction of the straight pipe portion following the bent pipe portion in cross section, It is possible to provide the manufacturing method of the bent pipe which can make small the crevice between the end face by the side of a bent pipe part, and the peripheral face of the straight pipe part.
本発明の実施形態に係る曲げパイプの製造方法について、添付図１〜１０を参照しながら、その製造工程手順に沿って説明する。 A method of manufacturing a bent pipe according to an embodiment of the present invention will be described according to the manufacturing process procedure with reference to the attached FIGS.
図１は本実施形態に係る曲げパイプの製造方法において、（ａ）加工前のパイプ素管の形状、（ｂ）仮曲げ工程後の曲げパイプ中間体の形状を説明するための説明図である。 FIG. 1 is an explanatory view for explaining (a) the shape of a pipe base tube before processing and (b) the shape of a bent pipe intermediate after a preliminary bending step in the method for producing a bent pipe according to the present embodiment. .
図１（ａ）において、１は外径ｄ1の金属製パイプ素管である。また、金属製パイプ素管１の材料としては、Ａｌ−Ｍｎ系アルミニウム合金Ａ３００３、その他（高圧配管用炭素鋼鋼管ＳＴＳＷ１−Ｂ、銅等）の金属製材料を用いることが可能である。また、金属製パイプ素管１の外径ｄ1は、φ１７、肉厚は１．２ｍｍである。また、内外径の寸法が近い、他の寸法のパイプ素管も本発明の加工対象である。 In FIG. 1 (a), 1 is a metallic pipe element tube of an outer diameter d 1. Moreover, as a material of metal pipe pipe 1, metal materials, such as Al-Mn type aluminum alloy A3003 and others (carbon steel pipe STSW1-B for high pressure piping, copper etc.), can be used. The outer diameter d 1 of the metal pipe raw pipe 1, Ø17, thickness is 1.2 mm. In addition, other sizes of pipe blanks whose inner and outer diameters are similar are also to be processed by the present invention.
（仮曲げ工程）
図１（ｂ）に示すように、通常のＮＣベンダー等を用いて、金属製パイプ素管１に曲げ加工を施し、金属製パイプ素管１の一方の端部側に第１直管部２ａ、金属製パイプ素管１の他方の端部側に第２直管部２ｂをそれぞれ残しつつ、第１直管部２ａと第２直管部２ｂとの間に曲率半径が金属製パイプ素管１の直径（外径ｄ1＝φ１７）を超える例えばＲ2＝２０ｍｍの湾曲部２ｃを形成し、曲げパイプ中間体２を製作する。また、Ｒ1は湾曲部２ｃの曲げ内側部の曲率半径、Ｒ3は湾曲部２ｃの曲げ外側部の曲率半径である。
(Temporary bending process)
As shown in FIG. 1 (b), the metal pipe base pipe 1 is bent using a normal NC bender or the like, and the first straight pipe portion 2 a is formed on one end side of the metal pipe base pipe 1. And the second straight pipe portion 2b is left on the other end side of the metal pipe pipe 1 while the radius of curvature of the metal pipe pipe is between the first straight pipe portion 2a and the second straight pipe portion 2b. A bent portion 2c of, for example, R 2 = 20 mm which exceeds the diameter of 1 (outside diameter d 1 = φ 17) is formed, and a bent pipe intermediate 2 is manufactured. Further, R 1 is the radius of curvature of the bent inner portion of the curved portion 2c, R 3 is the radius of curvature of the bent outer portion of the curved portion 2c.
（ストライク曲げＲ矯正工程）
図２はストライク曲げＲ矯正工程前における、曲げパイプ中間体２、成形型１０、ストライク曲げＲ矯正用ピン治具２０および内径規制用ピン治具３０の位置関係を説明するための説明図である。
(Strike bending R correction process)
FIG. 2 is an explanatory view for explaining the positional relationship between the bending pipe intermediate body 2, the forming die 10, the strike bending R correction pin jig 20, and the inner diameter control pin jig 30 before the strike bending R correction process. .
成形型１０には、最終的に得ようとする曲げパイプ３の曲管部３ｃ｛図９参照；曲率半径が金属製パイプ素管１の直径（外径ｄ1＝φ１７）未満である｝の形状に成形するための空洞部１０ｃを備えている。空洞部１０ｃは、曲管部３ｃの曲げ外側部の曲面に対応した曲率半径Ｒ5の曲面を有した第１内周面１０ａと湾曲部２ｃの曲げ内側部の曲面に対応した曲面（曲率半径Ｒ4）を有した第２内周面１０ｂとによって画成されている。 The mold 10 is curved pipe portion 3c of the bend pipe 3 to be finally obtained {see FIG. 9; radius of curvature of the metal pipe raw pipe 1 a diameter of less than (outside diameter d 1 = φ17)} of It has a cavity 10c for forming into a shape. Cavity 10c is bent tube portion 3c of the bending first inner peripheral surface 10a and the bending corresponding to the inner portion of the curved surface of the curved portion 2c curved surface (radius of curvature having an outer portion of the curved surface of radius of curvature R 5 corresponding to the curved surface And a second inner circumferential surface 10b having R 4 ).
また、ストライク曲げＲ矯正用ピン治具２０は、外径ｄ0の本体部２０ａと第１内周面１０ａ（曲率半径Ｒ5）に対応した所定の形状（曲率半径Ｒ9）を有した爪部２０ｂから構成されている。 In addition, the strike bending R correction pin jig 20 has a claw having a predetermined shape (curvature radius R 9 ) corresponding to the main body 20 a of the outer diameter d 0 and the first inner circumferential surface 10 a (curvature radius R 5 ). It comprises the part 20b.
また、内径規制用ピン治具３０は、本体部３０ａと先端に向かって外径が小さくなった先端部３０ｂから構成されている。 Further, the inner diameter regulating pin jig 30 is configured of a main body portion 30a and a tip portion 30b whose outer diameter is reduced toward the tip.
本実施形態のストライク曲げＲ矯正工程においては、第１ストライク曲げＲ矯正工程と第２ストライク曲げＲ矯正工程の２段階のストライク曲げＲ矯正工程を有している。 The strike bending R correction process of the present embodiment includes a two-step strike bending R correction process of a first strike bending R correction process and a second strike bending R correction process.
図３に示すように、第１ストライク曲げＲ矯正工程は、上記仮曲げ工程後の曲げパイプ中間体２を成形型１０の空洞部１０ｃに配置し、曲げパイプ中間体２の第１直管部２ａまたは第２直管部２ｂのいずれか一方（本実施形態では、第１直管部２ａ）の管端から第１内周面１０ａに対応した上記所定の形状を有するストライク曲げＲ矯正用ピン治具２０を挿入し、ストライク曲げＲ矯正用ピン治具２０が挿入されなかった第１直管部２ａまたは第２直管部２ｂのいずれか他方（本実施形態では、第２直管部２ｂ）の管端から内径規制用ピン治具３０を挿入し、湾曲部２ｃの曲げ外側部の曲面を径方向外向きに拡大させるとともに、湾曲部２ｃの曲げ内側部の曲面も径方向外向きに拡大させて、曲率半径が金属製パイプ素管１の直径（外径ｄ1＝φ１７）未満である曲管部３ｃ（例えば、曲率半径Ｒ7＝１５ｍｍ）の形状のように成形する。 As shown in FIG. 3, in the first strike bending R correction step, the bending pipe intermediate 2 after the temporary bending step is disposed in the hollow portion 10 c of the forming die 10, and the first straight pipe portion of the bending pipe intermediate 2 A strike bending R correction pin having the above-mentioned predetermined shape corresponding to the first inner circumferential surface 10a from the tube end of either one of the 2a or the second straight pipe portion 2b (in the present embodiment, the first straight pipe portion 2a) The jig 20 is inserted, and either the first straight pipe portion 2a or the second straight pipe portion 2b in which the strike bending R correction pin jig 20 is not inserted (in the present embodiment, the second straight pipe portion 2b The inner diameter regulating pin jig 30 is inserted from the end of the tube to expand the curved surface of the bending outer portion of the bending portion 2c radially outward, and the curved surface of the bending inner portion of the bending portion 2c also radially outward by enlargement, curvature radius of the metal pipe raw pipe 1 a diameter (outer diameter d 1 Ø17) less than a is bent tube portion 3c (e.g., shaped to form a radius of curvature R 7 = 15mm).
図４に示すように、第２ストライク曲げＲ矯正工程は、上記第１ストライク曲げＲ矯正工程後に、曲げパイプ中間体２を裏返して成形型１０の空洞部１０ｃに配置し、上記第１ストライク曲げＲ矯正工程時にストライク曲げＲ矯正用ピン治具２０の挿入を選択しなかった第１直管部２ａ（この段階では、３ａと言い換える）または第２直管部２ｂ（この段階では、３ｂと言い換える）のいずれか一方（本実施形態では、第２直管部３ｂ）の管端からストライク曲げＲ矯正用ピン治具２０を挿入し、第１ストライク曲げＲ矯正工程時にストライク曲げＲ矯正用ピン治具２０の挿入を選択した第１直管部３ａまたは第２直管部３ｂのいずれか他方（本実施形態では、第１直管部３ａ）の管端から内径規制用ピン治具３０を挿入し、湾曲部２ｃの曲げ外側部の曲面を径方向外向きに拡大させるとともに、湾曲部２ｃの曲げ内側部の曲面も径方向外向きに拡大させて、最終的に得ようとする曲げパイプ３の曲管部３ｃ｛曲率半径が金属製パイプ素管１の直径（外径ｄ1＝φ１７）未満である、例えば、曲率半径Ｒ7＝１５ｍｍ｝の形状のように成形する。また、曲管部３ｃの曲げ外側部の曲面の曲率半径Ｒ8は、例えば２３．５ｍｍであり、曲管部３ｃの曲げ内側部の曲面の曲率半径Ｒ6は、例えば６．５ｍｍである。図４に示す所定位置３ｄは、後述するバルジ形成の起点となる。この所定位置３ｄは、断面視で曲管部３ｃの第２直管部３ｂに近い側の位置にある。また、曲管部３ｃの所定位置３ｄから第１直管部３ａの軸方向と平行に計測した第１外径をｄ4とする。 As shown in FIG. 4, in the second strike bending R correction step, after the first strike bending R correction step, the bending pipe intermediate 2 is turned over and disposed in the hollow portion 10c of the mold 10, and the first strike bending is performed. The first straight pipe portion 2a (in this stage, it is rephrased as 3a at this stage) or the second straight pipe portion 2b (in this stage, it is rephrased as 3b) in which the insertion of the strike bending R correction pin jig 20 was not selected at the R correction step. ) Insert the pin jig 20 for strike bending R correction from the end of the tube (in the present embodiment, the second straight pipe portion 3b), and fix the strike bending R correction pin at the time of the first strike bending R correction process. Insert the pin jig 30 for inner diameter control from the tube end of either the first straight pipe portion 3a or the second straight pipe portion 3b (in the present embodiment, the first straight pipe portion 3a) in which the insertion of the tool 20 is selected. And the song of the curve 2c The curved surface of the outer portion is expanded radially outward, and the curved surface of the bending inner portion of the curved portion 2c is also expanded radially outward to finally obtain the curved pipe portion 3c of the bent pipe 3 {curvature The radius is smaller than the diameter (outside diameter d 1 = φ 17) of the metal pipe blank 1, for example, it is shaped to have a radius of curvature R 7 = 15 mm}. The curvature radius R 8 of the curved surface of the bent outer portion of the curved pipe portion 3c is, for example, 23.5 mm, the radius of curvature R 6 of the curved surface of the bent inner portion of the curved pipe portion 3c is, for example, 6.5 mm. The predetermined position 3d shown in FIG. 4 is a starting point of bulge formation described later. The predetermined position 3d is at a position closer to the second straight pipe portion 3b of the curved pipe portion 3c in a cross sectional view. Further, the first outer diameter parallel to measured the axial direction of the first straight pipe portion 3a and d 4 from a predetermined position 3d of the curved pipe portion 3c.
なお、本実施形態においては、ストライク曲げＲ矯正工程として、第１ストライク曲げＲ矯正工程と第２ストライク曲げＲ矯正工程の２段階のストライク曲げＲ矯正工程を有した場合について説明したが、必ずしもこれに限定されるものではない。すなわち、最終的に得ようとする曲げパイプ３の、曲率半径が金属製パイプ素管１の直径（外径ｄ1＝φ１７）未満である、曲管部３ｃの形状に成形するための空洞部１０ｃを備えた成形型１０に曲げパイプ中間体２を配置し、第１および第２直管部２ａ、２ｂの少なくともいずれかの一方の管端から所定の形状を有するストライク曲げＲ矯正用ピン治具２０を挿入し、湾曲部２ｃの曲げ外側部の曲面を径方向外向きに拡大させるとともに、湾曲部２ｃの曲げ内側部の曲面も径方向外向きに拡大させて、曲管部３の形状に成形するように構成されていればよい。 In the present embodiment, the strike bending R correction process includes the two steps of the strike bending R correction process of the first strike bending R correction process and the second strike bending R correction process. It is not limited to That is, bend the pipe 3 to be finally obtained is less than the radius of curvature of the metal pipe raw pipe 1 a diameter (outer diameter d 1 = Ø17), cavities for forming the shape of the curved pipe portion 3c A bending pipe intermediate 2 is disposed in a mold 10 having a 10c, and a strike bending R correction pin recovery having a predetermined shape from at least one of the first and second straight pipe portions 2a and 2b. The tool 20 is inserted, and the curved surface of the bending outer portion of the curved portion 2c is expanded radially outward, and the curved surface of the bending inner portion of the curved portion 2c is also expanded radially outward, It should just be comprised so that it may shape | mold.
（外周固定工程）
図５は上記ストライク曲げＲ矯正工程後の曲げパイプ３の外周を固定するための割型状のクランプ型を説明するための説明図である。
(Peripheral fixing process)
FIG. 5 is an explanatory view for explaining a split-type clamp mold for fixing the outer periphery of the bending pipe 3 after the strike bending R correction process.
図５に示すように、上記ストライク曲げＲ矯正工程後の曲げパイプ３の第１直管部３ａと曲管部３ｃとを収容する第１空洞部４０ａと、断面視で曲管部３ｃの第２直管部３ｂに近い側の所定位置３ｄに対応させて設けられた、第１直管部３ａの軸方向と平行にかつ第２直管部３ｂの外径より大きな内径Ｄ3になるように座ぐりされた第２空洞部４０ｂと、を有した割型状のクランプ型４０で、上記ストライク曲げＲ矯正工程後の曲管部３ｃの少なくとも第１直管部３ａに近い側に位置する部分と第１直管部３ａとのそれぞれの外周を固定する。また、第１直管部３ａ内には、パイプ内支えピン治具４５が挿入されているため、以降の各工程において、座屈が発生するのを防止できる。 As shown in FIG. 5, a first hollow portion 40a for housing the first straight pipe portion 3a and the bent pipe portion 3c of the bent pipe 3 after the strike bending R correction step, and a second hollow portion of the bent pipe portion 3c in cross section provided in correspondence to the side of the predetermined position 3d closer to the second straight pipe portion 3b, so that the larger inner diameter D 3 than the outer diameter of the parallel and the second straight pipe portion 3b in the axial direction of the first straight pipe portion 3a A split mold-like clamp mold 40 having a second hollow section 40b spotted on the side, which is located on the side close to at least the first straight pipe section 3a of the bent pipe section 3c after the strike bending R correction step. The outer circumferences of the portion and the first straight pipe portion 3a are fixed. Further, since the in-pipe support pin jig 45 is inserted into the first straight pipe portion 3a, it is possible to prevent the occurrence of buckling in the subsequent steps.
（拡管部形成工程）
図６は拡管部形成工程の手順を説明するための説明図である。
(Expansion section formation process)
FIG. 6 is an explanatory view for explaining the procedure of the expanded tube forming step.
図６に示すように、クランプ型４０の外に突出した第２直管部３ｂの内径Ｄ1より大きな外径ｄ2の拡径部５０ｂと先端爪部５０ａとを有した第１ピン５０が内蔵され、拡径部５０ｂと径方向に所定の間隙ｔ2を有した第１有底筒状部（６０ａと６０ｂから構成される）を備えた第１パンチ６０をクランプ型４０の外に突出した第２直管部３ｂの管端と離間した状態で対向させ、所定の間隙ｔ2に第２直管部３ｂを挿入し、第１パンチ６０の第２直管部３ｂの管端側を向く先端面６０ｃを断面視で第２空洞部４０ｂの第１直管部３ａの軸方向と平行な方向を向く下部面４０ｃに当接させることにより、曲管部３ｃの第２直管部３ｂに近い側の所定位置３ｄの第１直管部３ａと平行な方向を向く第１外径ｄ4（図４参照）と第２直管部３ｂの外径ｄ1とが、第２直管部３ｂの外径ｄ1より大きな外径ｄ5の拡管部３ｅ（図７参照）に形成される。 As shown in FIG. 6, the first pin 50 having a diameter-enlarged portion 50b and the tip claw portion 50a of the larger outer diameter d 2 than the inner diameter D 1 of the second straight pipe portion 3b which protrudes outside of the clamp type 40 projecting built, the first bottomed cylindrical portion having a predetermined gap t 2 the enlarged diameter portion 50b in the radial direction of the first punch 60 having a (composed of 60a and 60b) outside of the clamp type 40 are opposed in a state of being separated with the pipe end of the second straight pipe portion 3b, and the second straight pipe portion 3b is inserted into a predetermined gap t 2, the tube end of the second straight pipe portion 3b of the first punch 60 The second straight pipe portion 3b of the curved pipe portion 3c is brought into contact with the lower end surface 60c facing the direction parallel to the axial direction of the first straight pipe portion 3a of the second hollow portion 40b in a sectional view. first outer diameter d 4 that faces the direction parallel to the first straight pipe portion 3a of the side near the predetermined position 3d on the outer diameter (see FIG. 4) and the second straight pipe portion 3b 1 and is formed in the expanded portion 3e of the large outer diameter d 5 than the outer diameter d 1 of the second straight pipe portion 3b (see FIG. 7).
上述した拡管部形成工程において、拡管部３ｅを設けたことにより、下記のような、さらなる特有な効果（３つのメリット）を奏する。１つ目のメリットは、金属製パイプ素管１の他方の端部側に設ける第２直管部３ｂの外径精度（真円）と外周の面精度を高くできる。２つ目のメリットは、後記図８に示すような、拡管部３ｅの一部分を予め残しておく際に、曲管部３ｃの外周の肉が第２直管部３ｂ側に流れてしまうのを防止できる。すなわち、曲管部３ｃの外周の肉が安定して移動する。３つ目のメリットは、予め後記図８に示すような、拡管部３ｅの一部分を残してあるため、精度の良いバルジ３ｆ（後記する）を形成することができる。 By providing the expanded tube portion 3e in the above-described expanded tube portion forming step, the following unique effects (three merits) are exhibited. The first merit is that the outer diameter accuracy (perfect circle) and the surface accuracy of the outer periphery of the second straight pipe portion 3b provided on the other end side of the metal pipe shell 1 can be increased. The second merit is that, as shown in FIG. 8 described later, when leaving a part of the expanded portion 3e in advance, the outer wall of the bent portion 3c flows toward the second straight portion 3b. It can prevent. That is, the meat on the outer periphery of the curved pipe portion 3c moves stably. The third merit is that a portion of the expanded portion 3e is left in advance as shown in FIG. 8 described later, so that a bulge 3f (described later) with high accuracy can be formed.
（外径調整工程）
図７は外径調整工程の手順を説明するための説明図である。
(Outside diameter adjustment process)
FIG. 7 is an explanatory view for explaining the procedure of the outer diameter adjustment step.
図７に示すように、入口７０ａから奥に向かって内径が小さくなるテーパー部７０ｂとテーパー部７０ｂの奥に第２直管部３ｂの外径ｄ1に対応する内径Ｄ7を有した第２有底筒状部（７０ｃと７０ｄから構成される）とを備えた第２パンチ７０をクランプ型４０外に突出した拡管部３ｅの管端と離間した状態で対向させ、第２パンチ７０の入口７０ａに拡管部３ｅを挿入し、第２パンチ７０の拡管部３ｅの管端側を向く先端面７０ｅを下部面４０ｃに当接させることにより、拡管部３ｅの曲管部３ｃ側の所定位置３ｄ（図４および図６参照）に相当する位置の外径ｄ5をそのまま維持し、拡管部３ｅの前記所定位置３ｄ（図４および図６参照）に相当する位置以外の部分の外径を第２直管部３ｂの外径ｄ1まで縮径する（図８参照）。 As shown in FIG. 7, a tapered portion 70 b whose inner diameter decreases from the inlet 70 a to the back, and an inner diameter D 7 corresponding to the outer diameter d 1 of the second straight pipe portion 3 b at the back of the tapered portion 70 b The second punch 70 having a bottomed cylindrical portion (consisting of 70c and 70d) is opposed to the end of the expanded tube portion 3e projecting out of the clamp die 40 in a state of being separated from the tube end, and the inlet of the second punch 70 The expanded portion 3e is inserted into the portion 70a, and the distal end surface 70e of the expanded portion 3e of the second punch 70 facing the end of the tube abuts on the lower surface 40c, whereby the predetermined position 3d of the expanded portion 3e on the curved tube portion 3c side maintaining intact the outer diameter d 5 of the position corresponding to (see FIGS. 4 and 6), the outer diameter of the predetermined position 3d portions other than the position corresponding to (see FIGS. 4 and 6) of the expanded portion 3e Chapter reduced in diameter to an outer diameter d 1 of the second straight pipe portion 3b (see FIG. 8).
（バルジ形成工程）
図８はバルジ形成工程の手順を説明するための説明図である。
(Bulge formation process)
FIG. 8 is an explanatory view for explaining the procedure of the bulge forming step.
図８に示すように、上記外径調整工程後の第２直管部３ｂの内径Ｄ1以下の外径ｄ0を有したピン８０が内蔵され、入口９０ａに最終的に得ようとする曲げパイプ３のバルジ３ｆの外径ｄ6（図９参照）に対応した内径Ｄ8の内周面９０ｆで、所定の深さｔ3を有した座ぐりされた段差部９０ｂおよび段差部９０ｂの奥にピン８０と径方向に所定の間隙ｔ4を有した有底筒状部（９０ｃと９０ｄから構成される）を備えたパンチ９０をクランプ型４０外に突出した第２直管部３ｂの管端と離間した状態で対向させ、所定の間隙ｔ4に第２直管部３ｂを挿入し、パンチ９０の第２直管部３ｂの管端側を向く先端面９０ｅを第２空洞部４０ｂの下部面４０ｃに当接させることにより、曲管部３ｃの第２直管部３ｂに近い側の所定位置３ｄ（図４および図６参照）に相当する位置の拡径されたままの外径ｄ5を、段差部９０ｂの内周面９０ｆに向かって径方向外向きにさらに膨張させて、バルジ３ｆを曲管部３ｃに第１直管部３ａの軸方向３ｇと平行な方向を向き、かつ、第１直管部３ａの外周に接するように一体形成する（図９参照）。 As shown in FIG. 8, a pin 80 having an inner diameter D 1 less the outer diameter d 0 of the second straight pipe portion 3b after the outer diameter adjustment process is built, the bending to be finally obtained in the inlet 90a outer diameter d 6 of the bulge 3f of the pipe 3 in the inner peripheral surface 90f of the inner diameter D 8 corresponding to (see FIG. 9), the back of the pocket has been stepped portion 90b and the stepped portion 90b having a predetermined depth t 3 tubes of the second straight pipe portion 3b bottomed cylindrical portion to the pin 80 and radially with a predetermined gap t 4 a punch 90 having a (composed of 90c and 90d) protruding outside the clamp die 40 in is opposed in a state of being spaced apart from the end, the second straight pipe portion 3b is inserted into a predetermined gap t 4, the tip end surface 90e facing the pipe end of the second straight pipe portion 3b of the punch 90 of the second cavity 40b By abutting the lower surface 40c, the predetermined position 3d on the side closer to the second straight pipe portion 3b of the curved pipe portion 3c (FIG. 4 and FIG. The outer diameter d 5 of the as-expanded position corresponding to the 6 reference), by further expanding radially outward toward the inner peripheral surface 90f of the step portion 90b, the bulge 3f in the bent tube portion 3c It is integrally formed so as to be in a direction parallel to the axial direction 3g of the first straight pipe portion 3a and in contact with the outer periphery of the first straight pipe portion 3a (see FIG. 9).
なお、パンチ９０の中に内蔵されたピン８０に設けられた段差９０ｇが、第２直管部３ｂの先端面３ｊのストッパーとなる。したがって、段差９０ｇと第２直管部３ｂの前出し長さを調整することで、外径ｄ5を内周面９０ｆに向かって膨張させる際の膨張量が決定される。これにより、バルジ３ｆの外径ｄ6、幅ｔ3（上記段差部９０ｂの所定の深さｔ3に相当）および良好な平面性を有する端面３ｋ（図９参照）を満足する正確なバルジ形状が形成される。 The step 90g provided on the pin 80 incorporated in the punch 90 serves as a stopper for the distal end surface 3j of the second straight pipe portion 3b. Therefore, by adjusting the advancing length of the step 90g and the second straight pipe portion 3b, expansion amount when inflating toward the outer diameter d 5 on the inner peripheral surface 90f it is determined. Thus, an accurate bulge shape satisfying the outer diameter d 6 of the bulge 3 f, the width t 3 (corresponding to the predetermined depth t 3 of the step portion 90 b) and the end face 3 k (see FIG. 9) having good flatness. Is formed.
従来のバルジ加工とは、いわゆるハイドロフォーミングと呼ばれるものである。すなわち、従来のバルジは、直管内に高圧流体を充填し、前記直管の両端を軸方向に圧縮し、前記直管内の高圧流体の圧力をさらに高めることで、前記直管の外周面を膨らまして形成された環状凸部を言う。これに対して、本発明に係るバルジは、上述したようなバルジ形成工程を採用し、そもそも高圧流体を用いることなく、曲管部３ｃの外周面を膨らまし、外径ｄ6、幅ｔ3および良好な平面性を有する端面３ｋを満足するように形成された環状凸部を言う。 The conventional bulge processing is what is called hydroforming. That is, in the conventional bulge, a straight pipe is filled with high pressure fluid, both ends of the straight pipe are axially compressed, and the pressure of the high pressure fluid in the straight pipe is further increased to expand the outer peripheral surface of the straight pipe. Say the annular convex part formed. On the other hand, the bulge according to the present invention adopts the bulge forming step as described above, and in the first place, the outer peripheral surface of the bent pipe portion 3c is expanded without using a high pressure fluid, and the outer diameter d 6 , the width t 3 and The annular convex part formed so that the end surface 3k which has a favorable planarity may be satisfied is said.
図９は図８に示す工程により、曲げパイプ３に一体形成されたバルジ３ｆを詳細に説明するための説明図である。図９において、バルジ３ｆの外径ｄ6は例えばφ１９で、厚さは例えば２ｍｍである。また、曲げパイプ３の第１直管部３ａの軸方向３ｇと第２直管部３ｂの軸方向３ｈとは直交する。ただし、直交とは、必ずしも数学的な直交に限定されるものではなく、数学的な直交からのずれの量が、所定量の許容される範囲に収まっているものまでを言う。図１０は図９に示す、バルジが一体形成された曲げパイプの外観写真である。 FIG. 9 is an explanatory view for explaining in detail the bulge 3 f integrally formed on the bent pipe 3 by the process shown in FIG. 8. 9, an outer diameter d 6, for example φ19 bulge 3f, a thickness of 2mm, for example. Further, the axial direction 3g of the first straight pipe portion 3a of the bent pipe 3 and the axial direction 3h of the second straight pipe portion 3b are orthogonal to each other. However, “orthogonal” is not necessarily limited to mathematical orthogonality, but refers to one in which the amount of deviation from mathematical orthogonality falls within a predetermined range of allowable amount. FIG. 10 is an external photograph of a bent pipe integrally formed with a bulge shown in FIG.
上述した本発明に係る曲げパイプの製造方法を採用したことにより、断面視でバルジ３ｆの直径方向（外径ｄ6の方向）と第１直管部３ａの軸方向３ｇとが平行になるように構成される場合において、初めて、バルジ３ｆの端面３ｉと第１直管部３ａの外周面が一直線上になるため、バルジ３ｆの端面３ｉと第１直管部３ａの外周面との間に隙間が生ずることのない曲げパイプ３を製造することが可能である（図９および図１０参照）。 By employing the manufacturing method of the pipe bend according to the present invention described above, (the direction of the outer diameter d 6) diametrically bulge 3f in cross section and so that the axial 3g of the first straight pipe portion 3a is parallel When the end face 3i of the bulge 3f and the outer peripheral surface of the first straight pipe portion 3a are in a straight line, it is between the end face 3i of the bulge 3f and the outer peripheral surface of the first straight pipe portion 3a. It is possible to produce a bent pipe 3 in which no gaps occur (see FIGS. 9 and 10).
また、本実施形態において、曲げパイプ３の内側曲げＲゼロの直角曲げも可能である。 Further, in the present embodiment, a right angle bending of the bending pipe 3 with an inner bending R of zero is also possible.
本発明に係るバルジ３ｆが一体形成された曲げパイプ３ならば、曲げパイプ３の曲管部３ｃをボンネットとインタークーラー本体との狭い空間に収容可能になるばかりか、従来ならばインタークーラー本体面と第１直管部３ａの外周面との間に設けたスペーサが不要になる。すなわち、本発明に係るバルジ３ｆが従来のスペーサの役割も果たす。当然、本発明に係るバルジ３ｆの端面３ｋは、曲げパイプ３をインタークーラー本体に取付ける時の位置決めを安定させる作用効果も奏する。また、本発明に係るバルジ３ｆは、前記端面３ｋをインタークーラー本体面に、ろう付けする際の位置決め性を安定させるばかりか、ろう付け自体の安定性も向上させる作用効果も奏する。 In the case of the bending pipe 3 integrally formed with the bulge 3f according to the present invention, not only can the bent pipe portion 3c of the bending pipe 3 be accommodated in the narrow space between the bonnet and the intercooler main body. The spacer provided between the first straight pipe portion 3a and the outer peripheral surface is not necessary. That is, the bulge 3f according to the present invention also plays the role of a conventional spacer. Naturally, the end face 3k of the bulge 3f according to the present invention also has an effect of stabilizing the positioning when attaching the bending pipe 3 to the intercooler main body. Further, the bulge 3f according to the present invention not only stabilizes the positioning ability when brazing the end face 3k to the surface of the intercooler main body, but also exhibits an effect of improving the stability of the brazing itself.
なお、本実施形態において、バルジ３ｆが一体形成された曲げパイプ３の第１直管部３ａは、長い直管として存在する例について説明したが、必ずしもこれに限定されるものではない。例えば、本発明に係るバルジ形成工程が終了した後、顧客の要望に応じて、第１直管部３ａの途中から曲げた構成とすることもある。また、同様に、本発明に係るバルジ形成工程が終了した後、顧客の要望に応じて、第２直管部３ｂを短く切断する等のさまざまな加工が施されることもある。いずれの場合にしても、本発明に係る曲げパイプの製造方法が用いられていることは、共通している。 In addition, in this embodiment, although the 1st straight pipe part 3a of the bending pipe 3 in which the bulge 3f was integrally formed demonstrated the example which exists as a long straight pipe, it is not necessarily limited to this. For example, after the bulge forming process according to the present invention is completed, the first straight pipe portion 3a may be bent in the middle according to the customer's request. Similarly, after the bulging process according to the present invention is completed, various processes such as cutting the second straight pipe portion 3b short may be performed according to the customer's request. In any case, it is common that the method for manufacturing a bent pipe according to the present invention is used.
以上、本発明の実施形態を説明したが、具体例を例示したに過ぎず、特に本発明を限定するものではなく、具体的構成等は、適宜設計変更可能である。また、発明を実施するための形態に記載された、作用及び効果は、本発明から生じる最も好適な作用及び効果を列挙したに過ぎず、本発明による作用及び効果は、発明を実施するための形態に記載されたものに限定されるものではない。 As mentioned above, although embodiment of this invention was described, only the specific example was illustrated and it does not limit this invention in particular, A specific configuration etc. can be designed and changed suitably. Further, the actions and effects described in the mode for carrying out the invention merely list the most preferable actions and effects arising from the present invention, and the actions and effects according to the present invention are for carrying out the invention It is not limited to what was described in the form.
１ 金属製パイプ素管
２ 曲げパイプ中間体
２ａ、３ａ 第１直管部
２ｂ、３ｂ 第２直管部
２ｃ 湾曲部
３ 曲げパイプ
３ｃ 曲管部
３ｄ 曲管部３ｃの第２直管部３ｂに近い側の所定位置
３ｅ 拡管部
３ｆ バルジ
３ｇ 第１直管部３ａの軸方向
３ｈ 第２直管部３ｂの軸方向
３ｉ、３ｋ 端面
３ｊ 先端面
１０ 成形型
１０ａ 第１内周面
１０ｂ 第２内周面
１０ｃ 空洞部
２０ ストライク曲げＲ矯正用ピン治具
２０ａ、３０ａ 本体部
２０ｂ 爪部
３０ 内径規制用ストライク曲げＲ矯正用ピン治具
３０ｂ 先端部
４０ クランプ型
４０ａ 第１空洞部
４０ｂ 第２空洞部
４０ｃ 下部面
４５ パイプ内支えピン治具
５０ 第１ピン
５０ａ 先端爪部
５０ｂ 拡径部
６０ 第１パンチ
６０ａ＋６０ｂ 第１有底筒状部
６０ｃ、７０ｅ、９０ｅ 先端面
７０ 第２パンチ
７０ａ、９０ａ 入口
７０ｂ テーパー部
７０ｃ＋７０ｄ 第２有底筒状部
８０ ピン
９０ パンチ
９０ｂ 段差部
９０ｃ＋９０ｄ 有底筒状部
９０ｆ 内周面
９０ｇ 段差
DESCRIPTION OF SYMBOLS 1 Metal pipe tube 2 Bending pipe intermediate 2a, 3a 1st straight pipe part 2b, 3b 2nd straight pipe part 2c Curved part 3 Bent pipe 3c Curved pipe part 3d To 2nd straight pipe part 3b of bent pipe part 3c Near side predetermined position 3e expanded tube portion 3f bulge 3g axial direction of the first straight pipe portion 3a 3h axial direction of the second straight pipe portion 3b 3i, 3k end face 3j end face 10 molding die 10a first inner circumferential surface 10b second inside Peripheral surface 10c Hollow part 20 Strike bend R correction pin jig 20a, 30a Body part 20b Claw part 30 Inner diameter control strike bend R correction pin jig 30b Tip part 40 Clamp type 40a 1st hollow part 40b 2nd hollow part 40c lower surface 45 pipe support pin jig 50 first pin 50a tip claw portion 50b enlarged diameter portion 60 first punch 60a + 60b first bottomed cylindrical portion 60c, 70e, 90e tip surface 70 2 punch 70a, 90a inlet 70b taper portion 70c + 70d second bottomed cylindrical portion 80 Pin 90 punches 90b stepped portion 90c + 90d bottomed cylindrical portion 90f in the peripheral surface 90g stepped
Claims (5)
プ素管の他方の端部側に第２直管部をそれぞれ残しつつ、前記第１直管部と前記第２直管
部との間に湾曲部を形成し、曲げパイプ中間体を製作する仮曲げ工程と、
最終的に得ようとする曲げパイプの曲管部の形状に成形するための空洞部を備えた成形
型に前記曲げパイプ中間体を配置し、前記第１および第２直管部の少なくともいずれかの一方の管端から所定の形状を有するストライク曲げＲ矯正用ピン治具を挿入することで、前記湾曲部の曲げ外側部の曲面を径方向外向きに拡大するとともに、前記湾曲部の曲げ内側部の曲面も径方向外向きに拡大して、前記曲管部の形状に成形するストライク曲げＲ矯正工程と、
前記第１直管部と前記曲管部とを収容する第１空洞部と、前記曲管部の前記第２直管部
に近い側の所定位置に対応し、かつ、前記第２直管部の外径より大きな内径になるように
座ぐりされ、断面視で奥側に前記第１直管部の軸方向と平行で、かつ、前記第１空洞部と前記第１直管部の外周面が接触する前記第２直管部側の接触線の延長上に形成された下部面を有した第２空洞部と、を有した割型状のクランプ型で、前記ストライク曲げＲ矯正工程後の前記曲管部の少なくとも前記第１直管部に近い側に位置する部分と前記第１直管部とのそれぞれの外周を固定する外周固定工程と、
前記曲管部の前記第２直管部に近い側の前記所定位置の前記第１直管部と平行な方向を
向く第１外径と前記第２直管部の外径とが前記第２直管部の外径より大きくなるような拡
管部に形成する拡管部形成工程と、
前記拡管部の前記曲管部側の前記所定位置の外径をそのまま維持し、前記拡管部の前記
所定位置以外の部分の外径を前記拡管部形成工程前の前記第２直管部の外径まで縮径する
外径調整工程と、
前記外径調整工程後の前記第２直管部の内径以下の外径を有したピンが内蔵され、入口
に最終的に得ようとする曲げパイプのバルジの外径に対応した内径で所定の深さに座ぐり
され設けられた段差部と、前記段差部より奥に前記ピンと径方向に所定の間隙を有した有
底筒状部と、を備えたパンチを、前記クランプ型の外に突出した前記第２直管部の管端と
離間した状態で対向させ、前記所定の間隙に前記第２直管部を挿入し、前記パンチの前記
第２直管部の管端側を向く先端面を前記第２空洞部の前記下部面に当接させることにより
、前記曲管部の前記第２直管部に近い側の前記所定位置の拡径されたままの外径を、前記段差部の内周面に向かって径方向外向きにさらに膨張させて、前記バルジを前記曲管部に前記第１直管部の軸方向と平行な方向を向き、かつ、前記第１直管部の外周に接するように一体形成するバルジ形成工程と、
を備えることを特徴とする曲げパイプの製造方法。 The pipe base pipe is subjected to a bending process, and the first straight pipe portion on one end side of the pipe base pipe, and the second straight pipe portion on the other end side of the pipe base pipe, respectively, Forming a curved portion between a straight pipe portion and the second straight pipe portion to produce a bent pipe intermediate body;
The bent pipe intermediate body is disposed in a mold provided with a cavity for forming the shape of a bent pipe portion of a bent pipe to be finally obtained, and at least one of the first and second straight pipe portions bending from one pipe end of the by inserting a strike bending R orthodontic pin jig having a predetermined shape, the rewritable larger curved surface of the bent outer portion of the curved portion radially outwardly of the curved portion even the curved surface of the inner portion to expand radially outwardly, and strike the bending R straightening process is molded into the shape of the curved pipe section,
The second straight pipe portion corresponds to a first hollow portion that accommodates the first straight pipe portion and the curved pipe portion, and a predetermined position on the side closer to the second straight pipe portion of the curved pipe portion. Is counterbored so as to have an inner diameter larger than the outer diameter of the first straight portion , and the outer surface of the first hollow portion and the first straight portion is parallel to the axial direction of the first straight portion A split mold like clamp mold having a second cavity having a lower surface formed on the extension of the contact line on the side of the second straight pipe that is in contact with the second straight pipe , and after the strike bending R correction step An outer periphery fixing step of fixing an outer periphery of at least a portion of the curved pipe portion located on a side closer to the first straight pipe portion and the first straight pipe portion;
The first outer diameter facing the direction parallel to the first straight pipe portion and the outer diameter of the second straight pipe portion of the predetermined position on the side closer to the second straight pipe portion of the curved pipe portion are the second An expanded tube portion forming step of forming the expanded tube portion to be larger than the outer diameter of the straight tube portion;
The outer diameter of the predetermined position on the side of the curved pipe portion of the expanded pipe portion is maintained as it is, and the outer diameter of the portion other than the predetermined position of the expanded pipe portion is outside the second straight pipe portion before the expanded pipe portion forming step. An outer diameter adjusting step of reducing the diameter to a diameter;
A pin having an outer diameter equal to or smaller than the inner diameter of the second straight pipe portion after the outer diameter adjusting step is incorporated, and an inner diameter corresponding to an outer diameter of a bulge of a bending pipe to be finally obtained at the inlet is predetermined. A punch having a stepped portion spotted at a depth and a bottomed cylindrical portion having a predetermined gap in the radial direction with the pin at the back of the stepped portion protrudes out of the clamp die And the second straight pipe portion is inserted into the predetermined gap, and a tip surface facing the tube end side of the second straight pipe portion of the punch. by abutting on the lower surface of the second cavity and the outer diameter of the as-expansion diameter of the predetermined position of the side closer to the second straight pipe portion of the curved pipe section, of the step portion The bulge is further expanded radially outward toward the inner circumferential surface, and the bulge is parallel to the axial direction of the first straight pipe portion in the curved pipe portion. Orientation direction, and a bulge forming step of integrally formed in contact with the outer circumference of the first straight pipe portion,
A method of manufacturing a bent pipe, comprising:
前記曲管部の曲げ外側部の曲面に対応した曲面を有した第１内周面と前記湾曲部の曲げ
内側部の曲面に対応した曲面を有した第２内周面とによって画成される空洞部を備えた成
形型を有し、
前記仮曲げ工程後の曲げパイプ中間体を前記成形型の前記空洞部に配置し、前記曲げパ
イプ中間体の前記第１直管部または第２直管部のいずれか一方の管端から前記第１内周面
に対応した所定の形状を有するストライク曲げＲ矯正用ピン治具を挿入し、前記ストライク曲げＲ矯正用ピン治具が挿入されなかった前記第１直管部または第２直管部のいずれか他方の管端から内径規制用ピン治具を挿入することで、前記湾曲部の曲げ外側部の曲面を径方向外向きに拡大するとともに、前記湾曲部の曲げ内側部の曲面も径方向外向きに拡大して、前記曲管部の形状のように成形する第１ストライク曲げＲ矯正工程と、
前記第１ストライク曲げＲ矯正工程後に、前記曲げパイプ中間体を裏返して前記成形型
の前記空洞部に配置し、前記第１ストライク曲げＲ矯正工程時に前記内径規制用ピン治具
を挿入した前記第１直管部または第２直管部のいずれか他方の管端から前記ストライク曲
げＲ矯正用ピン治具を挿入し、前記第１ストライク曲げＲ矯正工程時に前記ストライク曲げＲ矯正用ピン治具を挿入した前記第１直管部または第２直管部のいずれか一方の管端から前記内径規制用ピン治具を挿入することで、前記湾曲部の曲げ外側部の曲面を径方向外向きに拡大するとともに、前記湾曲部の曲げ内側部の曲面も径方向外向きに拡大して、最終的に得ようとする曲げパイプの前記曲管部の形状のように成形する第２ストライク曲げＲ矯正工程と、
を有したことを特徴とする請求項１に記載の曲げパイプの製造方法。 In the strike bending R correction process,
It is constituted by the 1st inner skin which had the curved surface corresponding to the curved surface of the bending outside part of the above-mentioned bent tube part, and the 2nd inner peripheral surface which had the curved surface corresponding to the curved surface of the bending inside of the above-mentioned curved part Having a mold with a cavity,
The bent pipe intermediate after the pre-bending step is disposed in the hollow portion of the mold, and the first straight pipe portion or the second straight pipe portion of the bent pipe intermediate is inserted from the one end of the first straight pipe portion or the second straight pipe portion. 1 Insert the strike bend R correction pin jig having a predetermined shape corresponding to the inner peripheral surface, and do not insert the strike bend R correction pin jig into the first straight pipe portion or the second straight pipe portion by inserting the inner diameter regulating pin jig from any other pipe end of the rewritable larger curved surface of the bent outer portion of the curved portion radially outwardly, also the curved surface of the bent inner portion of the curved portion expanding radially outward, the first strike bending R straightening shaping like a shape of the curved pipe section,
After the first strike bending R correction step, the bending pipe intermediate is turned over and disposed in the hollow portion of the mold, and the inner diameter control pin jig is inserted at the first strike bending R correction step. 1 Insert the strike bending R correction pin jig from the other pipe end of either the straight pipe portion or the second straight pipe portion, and perform the strike bending R correction pin jig at the time of the first strike bending R correction step. from inserted one tube end of the first straight pipe portion and the second straight pipe portion inserting said inner diameter regulating pin jig, the curved surface of the bent outer portion of the curved portion radially outwardly expanded to Rutotomoni, enlarged in the curved portion bent inward portion also radially outwardly of the curved surface of the second strike molded to the shape of the curved pipe portion of the bending pipe to be finally obtained bending R A correction process,
The method for producing a bent pipe according to claim 1, characterized in that:
前記クランプ型の外に突出した前記第２直管部の内径より大きな外径の拡径部を有した第１ピンが内蔵され、前記拡径部と径方向に所定の間隙を有した第１有底筒状部を備えた第１パンチを前記クランプ型の外に突出した前記第２直管部の管端と離間した状態で対向させ、前記所定の間隙に前記第２直管部を挿入し、前記第１パンチの前記第２直管部の管端側を向く先端面を前記第２空洞部の前記下部面に当接させることにより、前記曲管部の前記第１外径と前記第２直管部の外径とが前記第２直管部の外径より大きくなるような拡管部に形成されることを特徴とする請求項１または２に記載の曲げパイプの製造方法。 The above-mentioned tube expansion part formation process is
A first pin having an enlarged diameter portion with an outer diameter larger than the inner diameter of the second straight pipe portion protruding outside the clamp mold is incorporated, and a first gap having a predetermined gap in a radial direction with the enlarged diameter portion The first punch having a bottomed cylindrical portion is opposed to the end of the second straight pipe portion projecting out of the clamp mold in a state of being separated from the end of the second straight pipe portion, and the second straight pipe portion is inserted into the predetermined gap. The first outer diameter of the curved pipe portion and the first outer diameter of the curved pipe portion by bringing the end surface of the first punch facing the pipe end side of the second straight pipe portion into contact with the lower surface of the second hollow portion; The method for manufacturing a bent pipe according to claim 1 or 2, wherein the expanded pipe portion is formed such that the outer diameter of the second straight pipe portion is larger than the outer diameter of the second straight pipe portion.
入口から奥に向かって内径が小さくなるテーパー部と前記テーパー部より奥に前記第２直管部の外径に対応する内径を有した第２有底筒状部とを備えた第２パンチを、前記クランプ型の外に突出した前記拡管部の管端と離間した状態で対向させ、前記第２パンチの入口に前記拡管部を挿入し、前記第２パンチの前記拡管部の管端側を向く先端面を前記第２空洞部の前記下部面に当接させることにより、前記拡管部の前記曲管部側の前記所定位置の外径をそのまま維持し、前記拡管部の前記所定位置以外の部分の外径を前記第２直管部の外径まで縮径することを特徴とする請求項１〜３のいずれか１項に記載の曲げパイプの製造方法。 The outer diameter adjustment step is
A second punch having a tapered portion whose inner diameter decreases from the inlet toward the back and a second bottomed cylindrical portion having an inner diameter corresponding to the outer diameter of the second straight pipe portion at the back of the tapered portion And facing the tube end of the expanded tube portion projecting outward from the clamp die, inserting the expanded tube portion into the inlet of the second punch, and the tube end side of the expanded tube portion of the second punch The outer diameter of the predetermined position on the curved pipe side of the expanded tube portion is maintained as it is by bringing the tip end surface facing the lower surface of the second hollow portion, and the outer diameter of the expanded tube other than the predetermined position is maintained. The method according to any one of claims 1 to 3, wherein the outer diameter of the portion is reduced to the outer diameter of the second straight pipe portion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018197571A JP6546684B1 (en) | 2018-10-19 | 2018-10-19 | Method of manufacturing bent pipe |
| CN201910994004.9A CN110883262B (en) | 2018-10-19 | 2019-10-18 | Method for manufacturing bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018197571A JP6546684B1 (en) | 2018-10-19 | 2018-10-19 | Method of manufacturing bent pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP6546684B1 true JP6546684B1 (en) | 2019-07-17 |
| JP2020062679A JP2020062679A (en) | 2020-04-23 |
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| CN111531051A (en) * | 2020-03-30 | 2020-08-14 | 江苏统联科技股份有限公司 | Method for processing pipe orifice convex diameter of waste gas recirculation water inlet and outlet pipe |
| JP6842145B1 (en) * | 2020-12-04 | 2021-03-17 | サンライズ工業株式会社 | Bending pipe manufacturing method |
| KR102340897B1 (en) * | 2021-05-14 | 2021-12-17 | 주식회사 한국슈어조인트 | Bend forming device |
| KR102571074B1 (en) * | 2021-06-18 | 2023-08-28 | 주식회사 한국슈어조인트 | Mold device for elbow pipe |
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| JP3373245B2 (en) * | 1993-03-16 | 2003-02-04 | 松本重工業株式会社 | Method of manufacturing bent pipe |
| CN2187081Y (en) * | 1993-12-24 | 1995-01-11 | 新疆石油管理局油田建设工程公司 | Metal bend preformer |
| JP3704781B2 (en) * | 1995-04-14 | 2005-10-12 | 株式会社デンソー | Pipe processing method and apparatus and joint connector used in the processing method |
| JP4914962B2 (en) * | 2005-07-28 | 2012-04-11 | 株式会社 クニテック | Pipe manufacturing method |
| CN203862866U (en) * | 2014-06-13 | 2014-10-08 | 郝海 | Thin tube bending die |
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