WO2023007997A1 - Device for manufacturing fuel filler pipe and method for manufacturing fuel filler pipe - Google Patents

Device for manufacturing fuel filler pipe and method for manufacturing fuel filler pipe Download PDF

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Publication number
WO2023007997A1
WO2023007997A1 PCT/JP2022/024910 JP2022024910W WO2023007997A1 WO 2023007997 A1 WO2023007997 A1 WO 2023007997A1 JP 2022024910 W JP2022024910 W JP 2022024910W WO 2023007997 A1 WO2023007997 A1 WO 2023007997A1
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WO
WIPO (PCT)
Prior art keywords
forming roll
forming
peripheral surface
pipe
metal pipe
Prior art date
Application number
PCT/JP2022/024910
Other languages
French (fr)
Japanese (ja)
Inventor
寛輝 堀之内
Original Assignee
日鉄ステンレス株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日鉄ステンレス株式会社 filed Critical 日鉄ステンレス株式会社
Priority to CN202280050753.6A priority Critical patent/CN117715711A/en
Priority to KR1020247002393A priority patent/KR20240024964A/en
Priority to CA3225750A priority patent/CA3225750A1/en
Priority to JP2023538334A priority patent/JPWO2023007997A1/ja
Publication of WO2023007997A1 publication Critical patent/WO2023007997A1/en

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    • 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
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically
    • 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
    • B21D51/02—Making hollow objects characterised by the structure of the objects
    • B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects

Definitions

  • the present invention relates to an oil supply pipe manufacturing apparatus and an oil supply pipe manufacturing method.
  • This application claims priority based on Japanese Patent Application No. 2021-122632 filed in Japan on July 27, 2021, the contents of which are incorporated herein.
  • the fuel tanks of automobiles, etc. are equipped with a refueling pipe for injecting fuel into the tank when refueling.
  • This oil supply pipe is sometimes called a fuel inlet pipe.
  • the material of the lubricating pipe is generally a metallic material such as ordinary steel or stainless steel, and recently, a resin pipe is also used.
  • the oil supply pipe has a pipe body and an expanded pipe portion provided on one end side of the pipe body. The other end of the pipe body is connected to the fuel tank.
  • An oil filler port is provided in the expanded tube portion.
  • a threaded portion is provided inside the expanded tube portion.
  • the threaded portion is a helical convex portion that protrudes from the inner surface of the expanded tube portion.
  • FIG. 11 of Patent Document 1 As an example of a method of manufacturing a lubricating pipe, in FIG. 11 of Patent Document 1 below, when a thread is formed on a metal pipe, the metal pipe is covered with a metal pipe formed with a forming groove, and the metal pipe is integrated with the core metal. A method is described in which, when the metal pipe begins to rotate, the ridge forming part of the forming roller, which rotates in the opposite direction to the core bar, is pressed against the metal pipe, plastically deformed, and gradually forms a screw part following the forming groove.
  • a forming roller 102 is provided with two ridge forming portions 102a.
  • each of the ridge forming portions 102a of the forming roller 102 partially overlaps each other.
  • the vicinity of the tip portion of the upper protruding strip forming portion 102a and the vicinity of the terminal end portion of the lower protruding strip forming portion 102a are viewed along the axial direction of the rotating shaft. case overlaps.
  • FIG. 9 shows a schematic plan view and a schematic front view of a conventional forming roll.
  • FIG. 10 shows a schematic side view when the forming roll shown in FIG. 9 is rotated by 90°.
  • FIG. 11 shows a process diagram when forming a threaded portion with a conventional forming roll.
  • the peripheral surface of a cylindrical forming roll 301 is provided with two ridges 302a and 302b.
  • the vicinity of the end of the ridge 302a overlaps with the vicinity of the other ridge 302b. More specifically, as shown in FIG.
  • a threaded portion is formed on the metal pipe 401 using such a forming roll 301 in the same manner as in Patent Document 1, as shown in FIG.
  • the vicinity of the portion 302a 1 and the vicinity of the end portion 302b 1 of the other protruding portion 302b are in contact at the same time.
  • the metal tube 401 is simultaneously processed by these two ridges 302a and 302b.
  • the metal pipe 401 is pulled in its longitudinal direction and the material is thinned. As a result, cracks are likely to occur in the metal pipe after processing, starting from the thinned portion.
  • the material of the diameter-expanded portion undergoes work hardening when the diameter of the pipe is expanded. Therefore, the formation of threads makes cracks more likely to occur.
  • the present invention has been made in view of the above circumstances, and provides an oil supply pipe manufacturing apparatus and an oil supply pipe manufacturing method capable of preventing cracks from occurring when a threaded portion is formed in a metal pipe.
  • the task is to
  • An oil supply pipe manufacturing apparatus includes a first forming roll arranged on the outer peripheral surface side of a metal pipe, a second forming roll arranged on the inner peripheral surface side of the metal pipe, and the An apparatus for manufacturing an oil supply pipe, wherein a threaded portion is formed in the metal pipe by performing roll forming on the metal pipe with a first forming roll and the second forming roll,
  • the first forming roll having a first rotating shaft, a first peripheral surface, and one first ridge spirally provided on the first peripheral surface along the circumferential direction with a length of less than one turn; and ,
  • a second forming roll having a second rotating shaft, a second peripheral surface, and a second ridge portion spirally provided on the second peripheral surface along the circumferential direction, arranged so that the first rotating shaft and the second rotating shaft are parallel,
  • the first forming roll and the second forming roll are configured to rotate.
  • a method for manufacturing a lubricating pipe includes disposing a first forming roll on the outer peripheral surface side of a metal pipe, disposing a second forming roll on the inner peripheral surface side of the metal pipe, A method for forming a threaded portion in the metal pipe by roll forming the metal pipe with the first forming roll and the second forming roll, the method comprising: As the first forming roll, a first rotating shaft, a first peripheral surface, and one first ridge portion spirally provided on the first peripheral surface along the circumferential direction with a length of less than one turn.
  • a first forming roll having As the second forming roll a second forming roll having a second rotating shaft, a second peripheral surface, and a second ridge portion spirally provided on the second peripheral surface along the peripheral direction is used.
  • an oil supply pipe manufacturing apparatus and an oil supply pipe manufacturing method capable of preventing cracks from occurring when forming a threaded portion in a metal pipe.
  • FIG. 1 is a schematic front view showing a first forming roll and a second forming roll provided in an oil supply pipe manufacturing apparatus according to an embodiment of the present invention.
  • 2A is a schematic front view of the first forming roll of FIG. 1 as seen from another angle;
  • FIG. 2B is a schematic plan view showing a first forming roll;
  • FIG. 3 is a cross-sectional view showing a main part of the fuel supply pipe manufacturing apparatus according to the embodiment of the present invention;
  • FIG. 4 is a schematic front view showing a main part of the oil supply pipe obtained by the manufacturing apparatus or manufacturing method of the embodiment of the present invention;
  • FIG. 5 is a schematic partial cross-sectional view showing a threaded portion of the oil supply pipe according to the embodiment of the present invention;
  • FIG. 6 is a schematic plan view for explaining the method of manufacturing the oil supply pipe according to the embodiment of the present invention.
  • FIG. 7 is a diagram showing a main part of the oil supply pipe according to the embodiment of the present invention, and is a diagram for explaining the circumferential angle ⁇ .
  • 8A and 8B are diagrams for explaining a method for manufacturing a fuel supply pipe, in which FIG. 8A is a diagram for explaining a comparative embodiment, and FIG. Schematic plan view and schematic front view showing a conventional forming roll. 10 is a schematic front view of the conventional forming roll of FIG. 9 viewed from another angle; FIG. The schematic diagram explaining the formation method of the thread part using the conventional forming roll.
  • FIG. 1 shows a first forming roll and a second forming roll provided in the oil supply pipe manufacturing apparatus of this embodiment.
  • FIG. 2A shows the first forming roll rotated by 90° from the state shown in FIG. 1
  • FIG. 2B shows a schematic plan view of the first forming roll.
  • FIG. 3 shows a cross-sectional view of a main part of the manufacturing apparatus for the oil supply pipe.
  • a manufacturing apparatus 1 for a lubricating pipe includes a first forming roll 11 and a second forming roll 21 shown in FIG.
  • the first forming roll 11 and the second forming roll 21 are arranged apart, and the first rotating shaft 13 of the first forming roll 11 and the second rotating shaft 23 of the second forming roll 21 are arranged parallel to each other. ing.
  • the first rotating shaft 13 of the first forming roll 11 and the second rotating shaft 23 of the second forming roll 21 are each connected to a drive unit (not shown). Each driving unit rotates the first forming roll 11 and the second forming roll 21 .
  • the first forming roll 11 is composed of a first roll body 12 and a first rotating shaft 13, as shown in FIG.
  • the first roll body 12 has a columnar shape, and has a first peripheral surface 14 on its peripheral surface, and a single first ridge 15 is provided on the first peripheral surface 14 .
  • the first ridge portion 15 is a ridge that protrudes from the first peripheral surface 14 and is arranged spirally along the circumferential direction of the first peripheral surface 14. It is The first ridge portion 15 is provided with one end 15a and the other end 15b along the longitudinal direction. The length from one end 15a to the other end 15b of the first protruding line portion 15, that is, the length of the first protruding line portion 15 is shorter than the length of the first circumferential surface 14 spirally. Therefore, the first protruding line portion 15 is provided spirally along the circumferential direction of the first circumferential surface 14 with a length of less than one turn.
  • a circumference angle ⁇ o (unit: rad) is less than one circumference (more than 0 and less than 2 ⁇ (more than 0° and less than 360°)).
  • the circumference angle ⁇ o is defined as follows.
  • the circumferential angle ⁇ o of the first ridge portion 15 connects one end 15a of the first ridge portion 15 and the center 13a of the first roll body 12 in the cross section of the first roll body 12 orthogonal to the first rotation shaft 13.
  • the circumferential angle ⁇ o is preferably ⁇ (rad) or more (180° or more) and 1.5 ⁇ (rad) or less (270° or less).
  • the circumferential angle ⁇ o (unit: rad) is 2 ⁇ or more, another portion of the first ridge 15 is located beyond the one end 15a of the first ridge 15 in the axial direction of the first rotating shaft 13. It will be. In other words, on the first peripheral surface 14, there are places where the first protruding streaks 15 are adjacent to each other. As a result, different portions of the first protruding streak portion 15 simultaneously come into contact with the metal pipe and are processed when the metal pipe is formed. At a location that has been simultaneously processed by different locations on the first ridge 15, the metal pipe is pulled from both sides in its longitudinal direction as a result of being restrained by two different locations on the first ridge 15. It becomes easy for cracks to occur in the metal pipe after processing starting from the portion where the wall thickness is reduced. In order to prevent such problems, the circumferential angle ⁇ o (unit: rad) is set to be less than 2 ⁇ .
  • the distance in the direction of the first rotating shaft 13 between one end 15a and the other end 15b of the first ridge portion 15 is defined as the step Po of the first ridge portion 15.
  • the step Po is defined by two parallel straight lines extending in the circumferential direction (horizontal direction of the paper) from one end 15a and the other end 15b of the first protruding portion 15, perpendicular to the direction of the first rotating shaft 13 (vertical direction of the paper). The shortest distance between parallel straight lines when drawn. The details of the step Po of the first ridge portion 15 will be described later.
  • FIG. 3 shows the cross-sectional shape of the first protruding portion 15 .
  • the first ridge portion 15 has a base portion 15d that protrudes from the first circumferential surface 14 and a top portion 15c that has an arcuate tip end in a cross-sectional view.
  • the curvature radius Ro of the top portion 15c of the first protruding portion 15 will be described later.
  • the second forming roll 21 is composed of a second roll main body 22 having a second rotating shaft 23 and a second peripheral surface 24, and one second ridge portion 25. It is configured.
  • the second roll body 22 is cylindrical as shown in FIG.
  • the outer diameter of the second roll body 22 is smaller than the outer diameter of the first roll body 12 .
  • a second rotating shaft 23 is provided at the center of the lower surface of the second roll body 22 .
  • the peripheral surface of the second roll body 22 is a second peripheral surface 24 .
  • a single second protruding portion 25 is provided on the second peripheral surface 24 .
  • the second ridge portion 25 is a ridge projecting from the second peripheral surface 24, and along the circumferential direction of the second peripheral surface 24, at a constant pitch Pi (unit: mm). arranged in a spiral.
  • the length from one end to the other end of the second protruding streak 25, that is, the length of the second protruding streak 25 is longer than the length of one lap around the second circumferential surface 24, for example, three turns. is considered to be the length of That is, the second protruding streak portion 25 is spirally provided over one or more turns on the second peripheral surface 24 . Details of the distance between the adjacent second ridges 25, that is, the pitch Pi (unit: mm) will be described later.
  • FIG. 3 shows the cross-sectional shape of the second ridge portion 25 .
  • the second protruding portion 25 has a base portion 25d that protrudes from the second peripheral surface 24 and a top portion 25c that has an arcuate tip in a cross-sectional view.
  • the curvature radius Ri of the top portion 25c of the second protruding portion 25 will be described later.
  • a fuel filler pipe is, for example, a fuel filler pipe that injects fuel into a fuel tank of an automobile.
  • the oil supply pipe has a pipe body and an expanded pipe portion provided on one end side of the pipe body. The other end of the pipe body is connected to the fuel tank.
  • An oil filler port is provided in the expanded tube portion.
  • a spirally protruding threaded portion is provided inside the expanded tube portion.
  • Such an oil supply pipe is manufactured by expanding one end of a blank pipe to form an expanded portion, and forming a threaded portion by forming a peripheral wall surface of the expanded portion.
  • the metal pipe 2 to be processed in the manufacturing method of the present embodiment is an expanded portion obtained by expanding one end of the base pipe.
  • Examples of the material of the metal tube 2 (expanded tube portion) include metal materials such as ordinary steel and stainless steel.
  • the threaded portion 3 is formed in the metal tube 2 (expanded tube portion) by the manufacturing method described below.
  • FIG. 4 shows the appearance of the oil supply pipe, that is, the metal pipe 2 having the threaded portion 3, obtained by the manufacturing apparatus and manufacturing method of this embodiment.
  • a spiral groove 3a is formed in the outer peripheral surface 2a of the metal pipe 2 shown in FIG. 5 shows a schematic partial cross-sectional view for explaining the threaded portion 3 of the metal tube 2.
  • the spiral groove 3a formed on the outer peripheral surface 2a side is deeper than the wall thickness t (unit: mm) of the metal tube 2.
  • the inner peripheral surface 2b of the metal tube 2 is provided with spiral projections 4 corresponding to the spiral grooves 3a.
  • a threaded portion 3 is formed by this helical projection 4 .
  • the spiral protrusion 4 (groove portion 3a) has a total length longer than the length of one round of the outer peripheral surface 2a of the metal pipe 2. As shown in FIG. The distance between adjacent spiral projections 4, that is, the pitch P (unit: mm) of the threaded portion 3 will be described later.
  • the preparation process and the molding process are sequentially performed. Each step will be described in detail below.
  • the metal tube 2 is inserted into the second forming roll 21.
  • the forming rolls 11 and 21 are arranged such that the first rotating shaft 13 and the second rotating shaft 23 are parallel. That is, the first forming roll 11 is arranged on the side of the outer peripheral surface 2 a of the metal tube 2 , and the second forming roll 21 is arranged on the side of the inner peripheral surface 2 b of the metal tube 2 . Moreover, as shown in FIG. The relative positions of the second forming rolls 21 are adjusted.
  • FIG. 6 shows a state in which the metal tube 2 is inserted into the second forming roll 21 and the first forming roll 11 is arranged on the outer peripheral surface 2a side of the metal tube 2 in the preparation process.
  • the inner peripheral surface 2 b of the metal tube 2 is arranged to face the second forming roll 21
  • the outer peripheral surface 2 a of the metal tube 2 is arranged to face the first forming roll 11 .
  • the outer diameter of the second forming roll 21 including the second ridges 25 is substantially the same as the inner diameter of the metal tube 2 and slightly smaller.
  • the material forming the metal tube 2 is formed on the second peripheral surface 24 of the second forming roll 21 by the first protruding portion 15 .
  • Roll forming is performed on the metal pipe 2 by pressing between the second ridges 25 arranged in parallel to each other.
  • first, one end 15a of the first protruding portion 15 is brought into contact with the outer peripheral surface 2a of the metal pipe 2, and the first protruding portion 15 pushes the material of the metal pipe 2 toward the second forming roll 21 side.
  • the first forming roll 11 and the second forming roll 21 are rotated in opposite directions.
  • the metal tube 2 rotates in the same rotation direction as the rotation direction of the second forming roll 21 .
  • the metal pipe 2 is moved between the second protruded streak portions 25 by the first protruded streak portion 15. They are pushed in order.
  • the pushing of the metal pipe 2 by the first protruding streak portion 15 continues until the other end 15 b of the first protruding streak portion 15 contacts the metal pipe 2 .
  • a spiral groove 3a is formed on the outer peripheral surface 2a of the metal pipe 2.
  • the pushing amount of the first ridge portion 15 is made larger than the thickness t of the metal pipe 2 .
  • a threaded portion 3 made up of a helical projection 4 is formed on the inner peripheral surface 2b of the metal tube 2.
  • the present invention is not limited to this, and there are cases in which they are rotated in the same direction. .
  • the spiral projection 4 (groove portion 3a) forming the screw portion 3 has a circumferential angle ⁇ (unit: rad) from one end 4a to the other end 4b of more than 2 ⁇ (more than 360°). ).
  • the upper limit of the circumferential angle ⁇ may be 380° or less, or may be 370° or less.
  • the circumferential angle ⁇ is defined as follows.
  • the circumferential angle ⁇ of the helical projection 4 forming the threaded portion 3 is defined by the straight line SL3 connecting one end 4a of the projection 4 and the center of the metal pipe 2 and the projection 4 in the cross section orthogonal to the longitudinal direction of the metal pipe 2. It is defined by an angle formed by two straight lines SL3 and SL4 of a straight line SL4 connecting the end 4b and the center of the metal tube 2.
  • FIG. 8 shows a method of forming the threaded portion of the comparative embodiment and a method of forming the threaded portion of the present embodiment.
  • the forming roll 301 shown in FIG. 9 was used as the first forming roll.
  • the first circumferential surface 314 of the first forming roll 301 is provided with two first ridges 301a and 301b.
  • the two first protruding streaks 301a and 301b are simultaneously in contact with the metal pipe 2 at the locations where the first protruding streaks 301a and 301b are adjacent to each other and are processed.
  • the material is constrained at the two adjacent first protruding streaks 301a and 301b, and as a result, the metal tube 2 is stretched in both longitudinal directions. Since the metal pipe 2 is pulled from the metal tube 2, the material is thinned, and cracks are likely to occur in the metal pipe 2 after processing starting from the thinned portion.
  • the first forming roll 11 shown in FIG. 1 was used.
  • one first protruding portion 15 is spirally provided along the circumferential direction with a length of less than one turn.
  • the metal pipe 2 is formed, the one end 15a of the first protruding portion 15 comes into contact with the metal pipe 2 first, and the other end 15b comes into contact last.
  • the metal pipe 2 is not processed at different locations of the first protruding streak portion 15 at the same time. Therefore, the stress applied to the metal tube 2 during processing is reduced, and the amount of thinning of the material can be reduced compared to the comparative embodiment.
  • the occurrence of cracks is suppressed. Therefore, even if the material of the metal tube 2 is stainless steel, which is more prone to cracking than ordinary steel, the occurrence of cracking due to the formation of the threaded portion 3 can be prevented.
  • ⁇ (unit: rad) is the circumferential angle from one end 4a to the other end 4b in the longitudinal direction of the spiral projection 4 forming the threaded portion 3
  • ⁇ o (unit: rad ) is the circumferential angle from one end 15a to the other end 15b in the longitudinal direction of the first protruding portion 15
  • R (unit: mm) is the radius of curvature (unit: mm) of the top portion 4c of the spiral projection 4.
  • t (unit: mm) is the wall thickness of the metal tube 2
  • P is the pitch (unit: mm) of the threaded portion 3 .
  • the radius of curvature Ri (unit: mm) of the top portion 25a of the second protruding portion 25 should be within a range that satisfies the following formula (2) with respect to the thickness t (unit: mm) of the metal pipe 2. is preferred.
  • the curvature radius R ( Unit: mm) is preferably within a range that satisfies the following formula (3).
  • the clearance C (unit: mm) between the first ridge portion 15 and the second ridge portion 25 with respect to the wall thickness t (unit: mm) of the metal tube 2 satisfies the following equation (4). It is preferable to set it as the range which does.
  • the clearance C between the first ridge portion 15 and the second ridge portion 25 does not become extremely large or extremely small, and the groove portion 3a The breakage of the metal tube 2 during the formation of is prevented.
  • the shape of the first protruding streak portion 15 is determined by the design value of the spiral projection 4 to be formed. Therefore, the step Po of the first ridge portion 15 is preferably set so as to satisfy the following equation (5). In addition, it is preferable to set the length ro ⁇ o of the first ridge portion 15 when the first forming roll 11 is viewed from above (see FIG. 2B) so as to satisfy the following formula (6).
  • ⁇ is a circumferential angle (unit: rad) from one end 4a to the other end 4b in the longitudinal direction of the helical projection 4 forming the threaded portion 3.
  • P is the pitch (unit: mm) of the threaded portion 3 .
  • D is the outer diameter of the metal tube 2 (unit: mm)
  • h is the height of the spiral projection 4 (unit: mm)
  • t is the thickness of the metal tube 2.
  • ⁇ o (unit: rad) is the circumferential angle (unit: rad) from one end 15a to the other end 15b of the first protruding portion 15 at the center of the first roll body 12, and ro is It is the linear distance from the center of the first roll body 12 to the first peripheral surface 14, that is, the radius of the first roll body 12 (unit: mm).
  • the pitch Pi of the second ridge portion 25 depends on the design value of the spiral projection 4 (thread portion 3) to be formed, the shape of the first ridge portion 15, the first forming roll 11 and the second forming roll 21. is preferably set so as to satisfy the following equation (7) based on the rotational speed of .
  • ⁇ is the circumferential angle (unit: rad) from one end 4a to the other end 4b in the longitudinal direction of the helical projection 4 forming the threaded portion 3.
  • ⁇ o (unit: rad) is a circumferential angle (unit: rad) from one end 15 a of the first ridge portion 15 to the other end 15 b of the first roll body 12 .
  • v is the absolute value (
  • P is the pitch of the screw portion 3 (unit: mm).
  • the first forming roll 11 is arranged on the side of the outer peripheral surface 2a of the metal pipe 2, and the first forming roll 11 has less than one turn. Only one first ridge 15 is provided spirally with a length of . Therefore, when the metal tube 2 is processed, the longitudinal direction end 15a and the other end 15b of the first protruding portion 15 do not come into contact with the metal tube 2 at the same time. There is no risk of significant thinning. Thereby, the occurrence of cracks in the metal pipe 2 can be prevented.
  • the material forming the metal pipe 2 is processed by the single first ridge portion 15 spirally provided with a length of less than one turn.
  • the threaded portion 3 is formed. Therefore, the strain applied to the threaded portion 3 can be reduced as compared with the conventional method, thereby more reliably preventing the occurrence of cracks.
  • the expanded diameter portion obtained by expanding the diameter of the raw pipe for example, expanding the diameter by 1.5 times or more from the original diameter
  • the expanded diameter portion metal pipe Even if the material of 2

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

This method for manufacturing a fuel filler pipe uses a first forming roll having a first rotation axis, a first circumferential surface, and one first projecting line, the first projecting line being spirally formed with a length less than one circumference along a circumferential direction of the first circumferential surface, and a second forming roll having a second rotation axis, a second circumferential surface, and a second projecting line, the second projecting line being spirally formed along a circumferential direction of the second circumferential surface, inserts a metal pipe into the second forming roll, disposes the first rotation axis and the second rotation axis parallel to each other, pushes a material of the metal pipe into between the second projecting line portions with the first projecting line while rotating the first forming roll and the second forming roll, and thereby forms a thread portion composed of a spiral projection on an inner circumferential surface of the metal pipe.

Description

給油管の製造装置及び給油管の製造方法Lubrication pipe manufacturing device and lubrication pipe manufacturing method
　本発明は、給油管の製造装置及び給油管の製造方法に関する。
　本願は、２０２１年７月２７日に、日本に出願された特願２０２１－１２２６３２号に基づき優先権を主張し、その内容をここに援用する。 TECHNICAL FIELD The present invention relates to an oil supply pipe manufacturing apparatus and an oil supply pipe manufacturing method.
This application claims priority based on Japanese Patent Application No. 2021-122632 filed in Japan on July 27, 2021, the contents of which are incorporated herein.
　自動車等の燃料タンクには、燃料補給時にタンク内に燃料を注入するための給油管が取り付けられている。この給油管は、フューエルインレットパイプと呼ばれることもある。給油管の素材は、一般に、普通鋼、ステンレス鋼などの金属材料であり、最近は樹脂製のものも使用されている。給油管は、管本体と、管本体の一端側に設けられた拡管部とを有している。管本体の他端は、燃料タンクに接続される。拡管部には、給油口が設けられている。拡管部の内側には、ねじ部が設けられている。ねじ部は、拡管部の内面から突出する螺旋状の凸部とされている。給油口に給油キャップが装着される際に、給油キャップのねじ部が、拡管部のねじ部にねじ込まれるようになっている。 The fuel tanks of automobiles, etc. are equipped with a refueling pipe for injecting fuel into the tank when refueling. This oil supply pipe is sometimes called a fuel inlet pipe. The material of the lubricating pipe is generally a metallic material such as ordinary steel or stainless steel, and recently, a resin pipe is also used. The oil supply pipe has a pipe body and an expanded pipe portion provided on one end side of the pipe body. The other end of the pipe body is connected to the fuel tank. An oil filler port is provided in the expanded tube portion. A threaded portion is provided inside the expanded tube portion. The threaded portion is a helical convex portion that protrudes from the inner surface of the expanded tube portion. When the oil filler cap is attached to the oil filler port, the threaded portion of the oil filler cap is screwed into the threaded portion of the tube expansion portion.
　従前、給油管を製造する際は、管本体と拡管部とを別々に製造した上で、管本体の一端側に拡管部を溶接等によって接合していた。しかし、最近では、工数削減及び部品点数削減を図るために、管本体及び拡径部を一体に成形してなる給油管が提案されている。このような給油管は、素管の一端側を拡管成形して拡管部とし、この拡管部の周壁面を成形加工してねじ部を形成することで製造されている。 In the past, when manufacturing oil supply pipes, the pipe main body and the expanded pipe section were manufactured separately, and then the expanded pipe section was joined to one end of the pipe main body by welding or the like. Recently, however, in order to reduce the number of man-hours and the number of parts, there has been proposed a fuel supply pipe in which the pipe main body and the enlarged diameter portion are integrally formed. Such an oil supply pipe is manufactured by expanding one end of a blank pipe to form an expanded portion, and forming a threaded portion by forming a peripheral wall surface of the expanded portion.
　給油管の製造方法の一例として、下記特許文献１の図１１には、金属パイプにネジを成形する際に、成形溝を形成した芯金に金属パイプを被せ、金属パイプが芯金と一体的に回転しはじめたら、芯金と反対方向に回転する成形ローラの凸条成形部を金属パイプに押し付け、塑性変形させて徐々に成形溝に倣ったネジ部を成形する方法が記載されている。特許文献１の図１１に記載されたネジの成形方法では、成形ローラ１０２に２つの凸条成形部１０２ａが設けられている。そして、凸条成形部１０２ａを金属パイプの外側から押し付けることで、金属パイプが部分的に凹まされて、パイプ内側に螺旋状の凸部が設けられる。なお、特許文献１の図１１に示されるように、成形ローラ１０２の各凸条成形部１０２ａは、成形ローラ１０２の回転軸の軸方向に沿って見た場合に、それぞれの一部が重なっている。より具体的には、特許文献１の図１１において、上側の凸条成形部１０２ａの先端部近傍と、下側の凸条成形部１０２ａの終端部近傍は、回転軸の軸方向に沿ってみた場合に重なっている。 As an example of a method of manufacturing a lubricating pipe, in FIG. 11 of Patent Document 1 below, when a thread is formed on a metal pipe, the metal pipe is covered with a metal pipe formed with a forming groove, and the metal pipe is integrated with the core metal. A method is described in which, when the metal pipe begins to rotate, the ridge forming part of the forming roller, which rotates in the opposite direction to the core bar, is pressed against the metal pipe, plastically deformed, and gradually forms a screw part following the forming groove. In the screw forming method described in FIG. 11 of Patent Document 1, a forming roller 102 is provided with two ridge forming portions 102a. Then, by pressing the ridge forming part 102a from the outside of the metal pipe, the metal pipe is partially recessed, and a helical protrusion is provided inside the pipe. Incidentally, as shown in FIG. 11 of Patent Document 1, when viewed along the axial direction of the rotation shaft of the forming roller 102, each of the ridge forming portions 102a of the forming roller 102 partially overlaps each other. there is More specifically, in FIG. 11 of Patent Document 1, the vicinity of the tip portion of the upper protruding strip forming portion 102a and the vicinity of the terminal end portion of the lower protruding strip forming portion 102a are viewed along the axial direction of the rotating shaft. case overlaps.
日本国特許第３４６２４２７号公報Japanese Patent No. 3462427
　図９～図１１を参照して、特許文献１に記載の成形ローラを用いた場合の問題点を説明する。図９に、従来の成形ロールの平面模式図及び正面模式図を示す。図１０に、図９に示した成形ロールを９０°回転させた場合の側面模式図を示す。図１１には、従来の成形ロールによってねじ部を形成した場合の工程図を示す。図９及び図１０に示すように、円筒状の成形ロール３０１の周面に、２つの凸条部３０２ａ、３０２ｂが設けられている。成形ロール３０１の回転軸の軸方向に沿って見た場合に、凸条部３０２ａの端部近傍と、もう一方の凸条部３０２ｂの端部近傍は重なっている。より具体的には、図１０に示すように、凸条部３０２ａの端部３０２ａ１近傍と、凸条部３０２ｂの端部３０２ｂ１近傍は、回転軸の軸方向に沿って見た場合に重なっている。このような成形ロール３０１を用いて特許文献１と同様にして金属管４０１に対してねじ部の形成を行うと、図１１に示すように、金属管４０１は、一方の凸条部３０２ａの端部３０２ａ１近傍と他方の凸条部３０２ｂの端部３０２ｂ１近傍とが同時に接触する。そして、金属管４０１は、これら２つの凸条部３０２ａ、３０２ｂによって同時に加工を受ける。２つの凸条部３０２ａ、３０２ｂによって同時に加工を受けた箇所Ｍでは、金属管４０１がその長手方向に引っ張られて、素材が減肉する。その結果、減肉された箇所を起点として、加工後の金属管に割れが発生しやすくなる。 Problems when using the forming roller described in Patent Document 1 will be described with reference to FIGS. 9 to 11. FIG. FIG. 9 shows a schematic plan view and a schematic front view of a conventional forming roll. FIG. 10 shows a schematic side view when the forming roll shown in FIG. 9 is rotated by 90°. FIG. 11 shows a process diagram when forming a threaded portion with a conventional forming roll. As shown in FIGS. 9 and 10, the peripheral surface of a cylindrical forming roll 301 is provided with two ridges 302a and 302b. When viewed along the axial direction of the rotating shaft of the forming roll 301, the vicinity of the end of the ridge 302a overlaps with the vicinity of the other ridge 302b. More specifically, as shown in FIG. 10, the vicinity of the end portion 302a1 of the protruding portion 302a and the vicinity of the end portion 302b1 of the protruding portion 302b overlap when viewed along the axial direction of the rotation shaft. ing. When a threaded portion is formed on the metal pipe 401 using such a forming roll 301 in the same manner as in Patent Document 1, as shown in FIG. The vicinity of the portion 302a 1 and the vicinity of the end portion 302b 1 of the other protruding portion 302b are in contact at the same time. The metal tube 401 is simultaneously processed by these two ridges 302a and 302b. At the location M that has been simultaneously processed by the two protruding streaks 302a and 302b, the metal pipe 401 is pulled in its longitudinal direction and the material is thinned. As a result, cracks are likely to occur in the metal pipe after processing, starting from the thinned portion.
　特に、素管を拡径して拡径部を形成してから、拡径部にねじ部を形成する場合は、素管を拡径した段階で、拡径部の素材が加工硬化を受けているため、ねじ部の形成によって割れがより発生しやすくなる。 In particular, when the diameter of the pipe is expanded to form the diameter-expanded portion, and then the threaded portion is formed in the diameter-expanded portion, the material of the diameter-expanded portion undergoes work hardening when the diameter of the pipe is expanded. Therefore, the formation of threads makes cracks more likely to occur.
　本発明は上記事情に鑑みてなされたものであって、金属管にねじ部を形成する際に、割れの発生を防止することが可能な、給油管の製造装置及び給油管の製造方法を提供することを課題とする。 SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an oil supply pipe manufacturing apparatus and an oil supply pipe manufacturing method capable of preventing cracks from occurring when a threaded portion is formed in a metal pipe. The task is to
　上記課題を解決するため、本発明は以下の構成を採用する。
［１］　本発明の一態様に係る給油管の製造装置は、金属管の外周面側に第１成形ロールを配置し、前記金属管の内周面側に第２成形ロールを配置し、前記第１成形ロール及び前記第２成形ロールによって前記金属管に対してロール成形を行うことにより、前記金属管にねじ部を形成する、給油管の製造装置であって、
　第１回転軸、第１周面及び前記第１周面上に周方向に沿って１周未満の長さで螺旋状に設けられた一つの第１凸条部を有する前記第１成形ロールと、
　第２回転軸、第２周面及び前記第２周面上に周方向に沿って螺旋状に設けられた第２凸条部を有する前記第２成形ロールと、が備えられ、
　前記第１回転軸と前記第２回転軸とが平行になるように配置され、
　前記第１成形ロールと前記第２成形ロールとが回転するように構成されている。
［２］　本発明の他の態様に係る給油管の製造方法は、金属管の外周面側に第１成形ロールを配置し、前記金属管の内周面側に第２成形ロールを配置し、前記第１成形ロール及び前記第２成形ロールによって前記金属管に対してロール成形を行うことにより、前記金属管にねじ部を形成する方法であって、
　前記第１成形ロールとして、第１回転軸、第１周面及び前記第１周面上に周方向に沿って１周未満の長さで螺旋状に設けられた一つの第１凸条部を有する第１成形ロールと、
　前記第２成形ロールとして、第２回転軸、第２周面及び前記第２周面上に周方向に沿って螺旋状に設けられた第２凸条部を有する第２成形ロールと、を用い、
　前記第２成形ロールに前記金属管を挿入し、前記第１回転軸及び前記第２回転軸が相互に平行になるように配置する準備工程と、
　前記第１成形ロール及び前記第２成形ロールを回転させつつ、前記第１凸条部によって前記金属管をなす素材を前記第２凸条部同士の間に押し込むことにより、前記金属管の内周面に、螺旋状の突起からなる前記ねじ部を形成する成形工程と、を備える。 In order to solve the above problems, the present invention employs the following configuration.
[1] An oil supply pipe manufacturing apparatus according to an aspect of the present invention includes a first forming roll arranged on the outer peripheral surface side of a metal pipe, a second forming roll arranged on the inner peripheral surface side of the metal pipe, and the An apparatus for manufacturing an oil supply pipe, wherein a threaded portion is formed in the metal pipe by performing roll forming on the metal pipe with a first forming roll and the second forming roll,
The first forming roll having a first rotating shaft, a first peripheral surface, and one first ridge spirally provided on the first peripheral surface along the circumferential direction with a length of less than one turn; and ,
A second forming roll having a second rotating shaft, a second peripheral surface, and a second ridge portion spirally provided on the second peripheral surface along the circumferential direction,
arranged so that the first rotating shaft and the second rotating shaft are parallel,
The first forming roll and the second forming roll are configured to rotate.
[2] A method for manufacturing a lubricating pipe according to another aspect of the present invention includes disposing a first forming roll on the outer peripheral surface side of a metal pipe, disposing a second forming roll on the inner peripheral surface side of the metal pipe, A method for forming a threaded portion in the metal pipe by roll forming the metal pipe with the first forming roll and the second forming roll, the method comprising:
As the first forming roll, a first rotating shaft, a first peripheral surface, and one first ridge portion spirally provided on the first peripheral surface along the circumferential direction with a length of less than one turn. a first forming roll having
As the second forming roll, a second forming roll having a second rotating shaft, a second peripheral surface, and a second ridge portion spirally provided on the second peripheral surface along the peripheral direction is used. ,
A preparation step of inserting the metal tube into the second forming roll and arranging the first rotating shaft and the second rotating shaft in parallel with each other;
While the first forming roll and the second forming roll are rotated, the material forming the metal pipe is pushed between the second ridges by the first ridges, whereby the inner circumference of the metal pipe is and a molding step of forming the threaded portion formed of a helical projection on the surface.
　本発明に係る上記態様によれば、金属管にねじ部を形成する際に、割れの発生を防止することが可能な、給油管の製造装置及び給油管の製造方法を提供できる。 According to the above aspect of the present invention, it is possible to provide an oil supply pipe manufacturing apparatus and an oil supply pipe manufacturing method capable of preventing cracks from occurring when forming a threaded portion in a metal pipe.
図１は、本発明の実施形態である給油管の製造装置に備えられた第１成形ロール及び第２成形ロールを示す正面模式図。FIG. 1 is a schematic front view showing a first forming roll and a second forming roll provided in an oil supply pipe manufacturing apparatus according to an embodiment of the present invention. 図２Ａは、図１の第１成形ロールを別の角度から見た正面模式図。2A is a schematic front view of the first forming roll of FIG. 1 as seen from another angle; FIG. 図２Ｂは、第１成形ロールを示す平面模式図。FIG. 2B is a schematic plan view showing a first forming roll; 図３は、本発明の実施形態である給油管の製造装置の要部を示す断面図。FIG. 3 is a cross-sectional view showing a main part of the fuel supply pipe manufacturing apparatus according to the embodiment of the present invention; 図４は、本発明の実施形態の製造装置又は製造方法によって得られる給油管の要部を示す正面模式図。FIG. 4 is a schematic front view showing a main part of the oil supply pipe obtained by the manufacturing apparatus or manufacturing method of the embodiment of the present invention; 図５は、本発明の実施形態である給油管のねじ部を示す部分断面模式図。FIG. 5 is a schematic partial cross-sectional view showing a threaded portion of the oil supply pipe according to the embodiment of the present invention; 図６は、本発明の実施形態である給油管の製造方法を説明する平面模式図。FIG. 6 is a schematic plan view for explaining the method of manufacturing the oil supply pipe according to the embodiment of the present invention. 図７は、本発明の実施形態である給油管の要部を示す図であって、周角度θを説明する図。FIG. 7 is a diagram showing a main part of the oil supply pipe according to the embodiment of the present invention, and is a diagram for explaining the circumferential angle θ. 図８は、給油管の製造方法を説明する図であって、（ａ）は比較形態を説明する図であり、（ｂ）は本実施形態を説明する図。8A and 8B are diagrams for explaining a method for manufacturing a fuel supply pipe, in which FIG. 8A is a diagram for explaining a comparative embodiment, and FIG. 従来の成形ロールを示す平面模式図及び正面模式図。Schematic plan view and schematic front view showing a conventional forming roll. 図１０は、図９の従来の成形ロールを別の角度から見た正面模式図。10 is a schematic front view of the conventional forming roll of FIG. 9 viewed from another angle; FIG. 従来の成形ロールを用いたねじ部の形成方法を説明する模式図。The schematic diagram explaining the formation method of the thread part using the conventional forming roll.
　以下、本発明の実施形態である給油管の製造装置及び製造方法について図面を参照して説明する。 An apparatus and method for manufacturing a fuel supply pipe according to an embodiment of the present invention will be described below with reference to the drawings.
（給油管の製造装置）
　本実施形態の給油管の製造装置について説明する。 (Manufacturing equipment for lubricating pipes)
A manufacturing apparatus for a fuel supply pipe according to the present embodiment will be described.
　図１には、本実施形態の給油管の製造装置に備えられた第１成形ロール及び第２成形ロールを示す。図２Ａには、図１に示した状態から９０°回転させた第１成形ロールを示し、図２Ｂには、第１成形ロールの平面模式図を示す。更に、図３には、給油管の製造装置の要部の断面図を示す。 FIG. 1 shows a first forming roll and a second forming roll provided in the oil supply pipe manufacturing apparatus of this embodiment. FIG. 2A shows the first forming roll rotated by 90° from the state shown in FIG. 1, and FIG. 2B shows a schematic plan view of the first forming roll. Further, FIG. 3 shows a cross-sectional view of a main part of the manufacturing apparatus for the oil supply pipe.
　本実施形態の給油管の製造装置１は、図１に示す第１成形ロール１１と第２成形ロール２１とを備える。第１成形ロール１１及び第２成形ロール２１は離れて配置され、かつ、第１成形ロール１１の第１回転軸１３と第２成形ロール２１の第２回転軸２３とが相互に平行に配置されている。また、第１成形ロール１１の第１回転軸１３及び第２成形ロール２１の第２回転軸２３は、それぞれ、図示略の駆動部に接続されている。各駆動部は、第１成形ロール１１及び第２成形ロール２１を回転させる。 A manufacturing apparatus 1 for a lubricating pipe according to the present embodiment includes a first forming roll 11 and a second forming roll 21 shown in FIG. The first forming roll 11 and the second forming roll 21 are arranged apart, and the first rotating shaft 13 of the first forming roll 11 and the second rotating shaft 23 of the second forming roll 21 are arranged parallel to each other. ing. Also, the first rotating shaft 13 of the first forming roll 11 and the second rotating shaft 23 of the second forming roll 21 are each connected to a drive unit (not shown). Each driving unit rotates the first forming roll 11 and the second forming roll 21 .
　第１成形ロール１１は、図１に示すように、第１ロール本体１２と第１回転軸１３とから構成されている。第１ロール本体１２は円柱状を有し、周面に第１周面１４を備えるとともに、第１周面１４に、一つの第１凸条部１５が設けられている。 The first forming roll 11 is composed of a first roll body 12 and a first rotating shaft 13, as shown in FIG. The first roll body 12 has a columnar shape, and has a first peripheral surface 14 on its peripheral surface, and a single first ridge 15 is provided on the first peripheral surface 14 .
　図１、図２Ａ及び図２Ｂに示すように、第１凸条部１５は、第１周面１４から突出された凸条であり、第１周面１４の周方向に沿って螺旋状に配置されている。第１凸条部１５には、長手方向に沿って一端１５ａと他端１５ｂとが設けられている。第１凸条部１５の一端１５ａから他端１５ｂまでの長さ、すなわち、第１凸条部１５の長さは、第１周面１４を螺旋状に１周する長さよりも短い。従って、第１凸条部１５は、第１周面１４の周方向に沿って１周未満の長さで螺旋状に設けられていることになる。 As shown in FIGS. 1, 2A, and 2B, the first ridge portion 15 is a ridge that protrudes from the first peripheral surface 14 and is arranged spirally along the circumferential direction of the first peripheral surface 14. It is The first ridge portion 15 is provided with one end 15a and the other end 15b along the longitudinal direction. The length from one end 15a to the other end 15b of the first protruding line portion 15, that is, the length of the first protruding line portion 15 is shorter than the length of the first circumferential surface 14 spirally. Therefore, the first protruding line portion 15 is provided spirally along the circumferential direction of the first circumferential surface 14 with a length of less than one turn.
　図２Ｂに示すように、第１成形ロール１１を平面視した場合（第１回転軸１３の軸方向から見た場合）に、第１凸条部１５の長手方向の一端１５ａから他端１５ｂに至る間の周角度θｏ（単位：ｒａｄ）が、一周未満（０超２π未満（０°超３６０°未満））とされている。周角度θｏは次のように定義される。第１凸条部１５の周角度θｏは、第１回転軸１３に直交する第１ロール本体１２の断面において、第１凸条部１５の一端１５ａと第１ロール本体１２の中心１３ａとを結んだ直線ＳＬ１及び第１凸条部１５の他端１５ｂと第１ロール本体１２の中心１３ａとを結んだ直線ＳＬ２の２本の直線ＳＬ１、ＳＬ２のなす角度で定義される。周角度θｏは、好ましくは、π（ｒａｄ）以上（１８０°以上）であり、１．５π（ｒａｄ）以下（２７０°以下）である。 As shown in FIG. 2B , when the first forming roll 11 is viewed from above (when viewed from the axial direction of the first rotating shaft 13), from one end 15a to the other end 15b in the longitudinal direction of the first ridge portion 15, A circumference angle θo (unit: rad) is less than one circumference (more than 0 and less than 2π (more than 0° and less than 360°)). The circumference angle θo is defined as follows. The circumferential angle θo of the first ridge portion 15 connects one end 15a of the first ridge portion 15 and the center 13a of the first roll body 12 in the cross section of the first roll body 12 orthogonal to the first rotation shaft 13. It is defined by the angle formed by two straight lines SL1 and SL2 connecting the other end 15b of the first ridge portion 15 and the center 13a of the first roll body 12 to the straight line SL1 and SL2. The circumferential angle θo is preferably π (rad) or more (180° or more) and 1.5π (rad) or less (270° or less).
　周角度θｏ（単位：ｒａｄ）が２π以上になると、第１凸条部１５の一端１５ａからの第１回転軸１３の軸方向の先に、第１凸条部１５の別の部分が位置することになる。言い換えると、第１周面１４において、第１凸条部１５が隣り合う箇所が発生する。これにより、金属管の成形時に、第１凸条部１５の異なる箇所が金属管に同時に接触して加工を受ける。第１凸条部１５の異なる箇所によって同時に加工を受けた箇所では、第１凸条部１５の異なる２か所で拘束される結果、金属管がその長手方向に両方から引っ張られるため、素材が減肉され、減肉された箇所を起点として加工後の金属管に割れが発生しやすくなる。このような不具合を防止するために、周角度θｏ（単位：ｒａｄ）は２π未満とする。 When the circumferential angle θo (unit: rad) is 2π or more, another portion of the first ridge 15 is located beyond the one end 15a of the first ridge 15 in the axial direction of the first rotating shaft 13. It will be. In other words, on the first peripheral surface 14, there are places where the first protruding streaks 15 are adjacent to each other. As a result, different portions of the first protruding streak portion 15 simultaneously come into contact with the metal pipe and are processed when the metal pipe is formed. At a location that has been simultaneously processed by different locations on the first ridge 15, the metal pipe is pulled from both sides in its longitudinal direction as a result of being restrained by two different locations on the first ridge 15. It becomes easy for cracks to occur in the metal pipe after processing starting from the portion where the wall thickness is reduced. In order to prevent such problems, the circumferential angle θo (unit: rad) is set to be less than 2π.
　また、図１に示すように、第１凸条部１５の一端１５ａと他端１５ｂとの第１回転軸１３方向の距離を、第１凸条部１５の段差Ｐｏと定義する。段差Ｐｏは、第１凸条部１５の一端１５ａ及び他端１５ｂからそれぞれ、第１回転軸１３方向（紙面上下方向）と直交しつつ周方向（紙面左右方向）に延びる２本の平行直線を引いた場合に、平行直線間の最短距離とする。第１凸条部１５の段差Ｐｏの詳細については後述する。 Further, as shown in FIG. 1, the distance in the direction of the first rotating shaft 13 between one end 15a and the other end 15b of the first ridge portion 15 is defined as the step Po of the first ridge portion 15. As shown in FIG. The step Po is defined by two parallel straight lines extending in the circumferential direction (horizontal direction of the paper) from one end 15a and the other end 15b of the first protruding portion 15, perpendicular to the direction of the first rotating shaft 13 (vertical direction of the paper). The shortest distance between parallel straight lines when drawn. The details of the step Po of the first ridge portion 15 will be described later.
　更に、図３には、第１凸条部１５の断面視形状が示されている。第１凸条部１５は、第１周面１４から突出する基部１５ｄと、先端が断面視円弧状である頂部１５ｃとを有している。第１凸条部１５の頂部１５ｃの曲率半径Ｒｏについては後述する。 Furthermore, FIG. 3 shows the cross-sectional shape of the first protruding portion 15 . The first ridge portion 15 has a base portion 15d that protrudes from the first circumferential surface 14 and a top portion 15c that has an arcuate tip end in a cross-sectional view. The curvature radius Ro of the top portion 15c of the first protruding portion 15 will be described later.
　次に、図１及び図３に示すように、第２成形ロール２１は、第２回転軸２３及び第２周面２４を有する第２ロール本体２２と、１つの第２凸条部２５とから構成されている。第２ロール本体２２は、図１に示すように円柱状とされている。第２ロール本体２２の外径は、第１ロール本体１２の外径よりも小さな外径とされている。第２ロール本体２２の下面の中央には、第２回転軸２３がある。また、第２ロール本体２２の周面が第２周面２４とされている。第２周面２４に、一つの第２凸条部２５が設けられている。 Next, as shown in FIGS. 1 and 3, the second forming roll 21 is composed of a second roll main body 22 having a second rotating shaft 23 and a second peripheral surface 24, and one second ridge portion 25. It is configured. The second roll body 22 is cylindrical as shown in FIG. The outer diameter of the second roll body 22 is smaller than the outer diameter of the first roll body 12 . A second rotating shaft 23 is provided at the center of the lower surface of the second roll body 22 . Also, the peripheral surface of the second roll body 22 is a second peripheral surface 24 . A single second protruding portion 25 is provided on the second peripheral surface 24 .
　図１に示すように、第２凸条部２５は、第２周面２４から突出された凸条であり、第２周面２４の周方向に沿って一定のピッチＰｉ（単位：ｍｍ）で螺旋状に配置されている。第２凸条部２５の一端から他端までの長さ、すなわち、第２凸条部２５の長さは、第２周面２４を螺旋状に１周する長さよりも長く、例えば３周分の長さとされている。つまり、第２凸条部２５は、第２周面２４上に１周以上に亘って螺旋状に設けられる。隣り合う第２凸条部２５間の距離、すなわちピッチＰｉ（単位：ｍｍ）の詳細については後述する。 As shown in FIG. 1, the second ridge portion 25 is a ridge projecting from the second peripheral surface 24, and along the circumferential direction of the second peripheral surface 24, at a constant pitch Pi (unit: mm). arranged in a spiral. The length from one end to the other end of the second protruding streak 25, that is, the length of the second protruding streak 25 is longer than the length of one lap around the second circumferential surface 24, for example, three turns. is considered to be the length of That is, the second protruding streak portion 25 is spirally provided over one or more turns on the second peripheral surface 24 . Details of the distance between the adjacent second ridges 25, that is, the pitch Pi (unit: mm) will be described later.
　図３には、第２凸条部２５の断面視形状が示されている。第２凸条部２５は、第２周面２４から突出する基部２５ｄと、先端が断面視円弧状である頂部２５ｃとを有している。第２凸条部２５の頂部２５ｃの曲率半径Ｒｉについては後述する。 FIG. 3 shows the cross-sectional shape of the second ridge portion 25 . The second protruding portion 25 has a base portion 25d that protrudes from the second peripheral surface 24 and a top portion 25c that has an arcuate tip in a cross-sectional view. The curvature radius Ri of the top portion 25c of the second protruding portion 25 will be described later.
　また、第１成形ロール１１と第２成形ロール２１の各回転軸方向の相対位置に関しては、図３に示すように、第１凸条部１５が、第２凸条部２５同士の間に位置するように、第１成形ロール１１と第２成形ロール２１の相対位置を調整することが好ましい。 Regarding the relative positions of the first forming roll 11 and the second forming roll 21 in the direction of each rotation axis, as shown in FIG. It is preferable to adjust the relative positions of the first forming roll 11 and the second forming roll 21 so as to do so.
（給油管の製造方法）
　次に、本実施形態の給油管の製造方法について説明する。 (Manufacturing method of lubricating pipe)
Next, a method for manufacturing the oil supply pipe of this embodiment will be described.
　まず、本実施形態の給油管の製造方法の加工対象である金属管２について説明する。給油管は、例えば、自動車の燃料タンクに燃料を注入する燃料給油管である。給油管は、管本体と、管本体の一端側に設けられた拡管部とを有している。管本体の他端は、燃料タンクに接続されるようになっている。拡管部には、給油口が設けられる。拡管部の内側には、螺旋状に突出したねじ部が設けられる。このような給油管は、素管の一端側を拡管成形して拡管部とし、この拡管部の周壁面を成形加工してねじ部を形成することで製造される。 First, the metal pipe 2 to be processed by the manufacturing method of the oil supply pipe of this embodiment will be described. A fuel filler pipe is, for example, a fuel filler pipe that injects fuel into a fuel tank of an automobile. The oil supply pipe has a pipe body and an expanded pipe portion provided on one end side of the pipe body. The other end of the pipe body is connected to the fuel tank. An oil filler port is provided in the expanded tube portion. A spirally protruding threaded portion is provided inside the expanded tube portion. Such an oil supply pipe is manufactured by expanding one end of a blank pipe to form an expanded portion, and forming a threaded portion by forming a peripheral wall surface of the expanded portion.
　本実施形態の製造方法における加工対象である金属管２は、素管の一端側を拡管成形することによって得られた拡管部とする。金属管２（拡管部）の素材は、普通鋼、ステンレス鋼などの金属材料を例示できる。そして、本実施形態では、以下に説明する製造方法によって、金属管２（拡管部）にねじ部３を形成する。 The metal pipe 2 to be processed in the manufacturing method of the present embodiment is an expanded portion obtained by expanding one end of the base pipe. Examples of the material of the metal tube 2 (expanded tube portion) include metal materials such as ordinary steel and stainless steel. In this embodiment, the threaded portion 3 is formed in the metal tube 2 (expanded tube portion) by the manufacturing method described below.
　図４に、本実施形態の製造装置及び製造方法によって得られる給油管、すなわちねじ部３を有する金属管２の外観を示す。図４に示す金属管２の外周面２ａには、螺旋状の溝部３ａが形成されている。また、図５には、金属管２のねじ部３を説明するための部分断面模式図を示す。金属管２の肉厚ｔ（単位：ｍｍ）に比べて、外周面２ａ側に形成した螺旋状の溝部３ａの深さが深くなっている。これにより、金属管２の内周面２ｂには、螺旋状の溝部３ａに対応する螺旋状の突起４が設けられる。ねじ部３は、この螺旋状の突起４により形成される。 FIG. 4 shows the appearance of the oil supply pipe, that is, the metal pipe 2 having the threaded portion 3, obtained by the manufacturing apparatus and manufacturing method of this embodiment. A spiral groove 3a is formed in the outer peripheral surface 2a of the metal pipe 2 shown in FIG. 5 shows a schematic partial cross-sectional view for explaining the threaded portion 3 of the metal tube 2. As shown in FIG. The spiral groove 3a formed on the outer peripheral surface 2a side is deeper than the wall thickness t (unit: mm) of the metal tube 2. As shown in FIG. As a result, the inner peripheral surface 2b of the metal tube 2 is provided with spiral projections 4 corresponding to the spiral grooves 3a. A threaded portion 3 is formed by this helical projection 4 .
　ねじ部３を構成する突起４の頂部４ｃの曲率半径Ｒ（単位：ｍｍ）及び突起４の高さｈ（単位：ｍｍ）の詳細は後述する。螺旋状の突起４（溝部３ａ）は、その全長が、金属管２の外周面２ａの１周分の長さよりも長くなっている。隣り合う螺旋状の突起４間の距離、すなわちねじ部３のピッチＰ（単位：ｍｍ）については後述する。 Details of the radius of curvature R (unit: mm) of the top portion 4c of the projection 4 and the height h (unit: mm) of the projection 4 constituting the threaded portion 3 will be described later. The spiral protrusion 4 (groove portion 3a) has a total length longer than the length of one round of the outer peripheral surface 2a of the metal pipe 2. As shown in FIG. The distance between adjacent spiral projections 4, that is, the pitch P (unit: mm) of the threaded portion 3 will be described later.
　本実施形態の給油管の製造方法では、準備工程と、成形工程とを順次行う。以下、各工程について詳細に説明する。 In the manufacturing method of the oil supply pipe of the present embodiment, the preparation process and the molding process are sequentially performed. Each step will be described in detail below.
　準備工程では、第２成形ロール２１に金属管２を挿入する。更に、第１回転軸１３及び第２回転軸２３が平行になるように各成形ロール１１、２１を配置する。すなわち、金属管２の外周面２ａ側に第１成形ロール１１を配置し、金属管２の内周面２ｂ側に第２成形ロール２１を配置する。また、図３に示したように、第１成形ロール１１の第１凸条部１５が第２成形ロール２１の第２凸条部２５同士の間に位置するように、第１成形ロール１１と第２成形ロール２１の相対位置を調整しておく。 In the preparation process, the metal tube 2 is inserted into the second forming roll 21. Further, the forming rolls 11 and 21 are arranged such that the first rotating shaft 13 and the second rotating shaft 23 are parallel. That is, the first forming roll 11 is arranged on the side of the outer peripheral surface 2 a of the metal tube 2 , and the second forming roll 21 is arranged on the side of the inner peripheral surface 2 b of the metal tube 2 . Moreover, as shown in FIG. The relative positions of the second forming rolls 21 are adjusted.
　図６には、準備工程において、第２成形ロール２１に金属管２を挿入し、金属管２の外周面２ａ側に第１成形ロール１１を配置した状態を示す。金属管２の内周面２ｂは第２成形ロール２１に対向配置され、一方、金属管２の外周面２ａは第１成形ロール１１に対向配置される。なお、第２成形ロール２１の第２凸条部２５を含む外径は、この金属管２の内径とほぼ同じ大きさ且つやや小さい。 FIG. 6 shows a state in which the metal tube 2 is inserted into the second forming roll 21 and the first forming roll 11 is arranged on the outer peripheral surface 2a side of the metal tube 2 in the preparation process. The inner peripheral surface 2 b of the metal tube 2 is arranged to face the second forming roll 21 , while the outer peripheral surface 2 a of the metal tube 2 is arranged to face the first forming roll 11 . In addition, the outer diameter of the second forming roll 21 including the second ridges 25 is substantially the same as the inner diameter of the metal tube 2 and slightly smaller.
　次に、成形工程では、第１成形ロール１１及び第２成形ロール２１を回転させつつ、第１凸条部１５によって金属管２をなす素材を、第２成形ロール２１の第２周面２４上に平行に並んでいる第２凸条部２５同士の間に押し込むことにより、金属管２に対してロール成形を行う。 Next, in the forming step, while the first forming roll 11 and the second forming roll 21 are rotated, the material forming the metal tube 2 is formed on the second peripheral surface 24 of the second forming roll 21 by the first protruding portion 15 . Roll forming is performed on the metal pipe 2 by pressing between the second ridges 25 arranged in parallel to each other.
　成形工程では、最初に、第１凸条部１５の一端１５ａを金属管２の外周面２ａに接触させ、第１凸条部１５によって金属管２の素材を第２成形ロール２１側に押し込みつつ、第１成形ロール１１及び第２成形ロール２１を相互に逆方向に回転させる。金属管２は、第２成形ロール２１の回転方向と同じ回転方向に回転する。また、第１凸条部１５を外周面２ａに押し込んだまま、第１成形ロール１１を回転させることで、金属管２が、第１凸条部１５によって第２凸条部２５同士の間に順次押し込まれる。第１凸条部１５による金属管２の押し込みは、第１凸条部１５の他端１５ｂが金属管２に接触するまで続く。これにより、金属管２の外周面２ａに螺旋状の溝部３ａが形成される。第１凸条部１５の押し込み量は、金属管２の肉厚ｔよりも大きくする。これにより、金属管２の内周面２ｂには、螺旋状の突起４からなる、ねじ部３が形成される。なお、ここでは、第１成形ロール１１と第２成形ロール２１とを逆方向に回転させる場合を例に挙げて説明したが、これに限定されるものではなく、同方向に回転させる場合もある。 In the forming process, first, one end 15a of the first protruding portion 15 is brought into contact with the outer peripheral surface 2a of the metal pipe 2, and the first protruding portion 15 pushes the material of the metal pipe 2 toward the second forming roll 21 side. , the first forming roll 11 and the second forming roll 21 are rotated in opposite directions. The metal tube 2 rotates in the same rotation direction as the rotation direction of the second forming roll 21 . Further, by rotating the first forming roll 11 while pushing the first protruded streak portion 15 into the outer peripheral surface 2a, the metal pipe 2 is moved between the second protruded streak portions 25 by the first protruded streak portion 15. They are pushed in order. The pushing of the metal pipe 2 by the first protruding streak portion 15 continues until the other end 15 b of the first protruding streak portion 15 contacts the metal pipe 2 . As a result, a spiral groove 3a is formed on the outer peripheral surface 2a of the metal pipe 2. As shown in FIG. The pushing amount of the first ridge portion 15 is made larger than the thickness t of the metal pipe 2 . As a result, a threaded portion 3 made up of a helical projection 4 is formed on the inner peripheral surface 2b of the metal tube 2. As shown in FIG. Here, the case where the first forming roll 11 and the second forming roll 21 are rotated in opposite directions has been described as an example, but the present invention is not limited to this, and there are cases in which they are rotated in the same direction. .
　ねじ部３をなす螺旋状の突起４（溝部３ａ）は、図７に示すように、その一端４ａから他端４ｂに至る間の周角度θ（単位：ｒａｄ）が、２π超（３６０°超）とされる。周角度θの上限は、３８０°以下でもよく、３７０°以下でもよい。なお、周角度θは次のように定義される。ねじ部３をなす螺旋状の突起４の周角度θは、金属管２の長手方向に直交する断面において、突起４の一端４ａと金属管２の中心とを結んだ直線ＳＬ３及び突起４の他端４ｂと金属管２の中心とを結んだ直線ＳＬ４の２本の直線ＳＬ３、ＳＬ４のなす角度で定義される。 As shown in FIG. 7, the spiral projection 4 (groove portion 3a) forming the screw portion 3 has a circumferential angle θ (unit: rad) from one end 4a to the other end 4b of more than 2π (more than 360°). ). The upper limit of the circumferential angle θ may be 380° or less, or may be 370° or less. The circumferential angle θ is defined as follows. The circumferential angle θ of the helical projection 4 forming the threaded portion 3 is defined by the straight line SL3 connecting one end 4a of the projection 4 and the center of the metal pipe 2 and the projection 4 in the cross section orthogonal to the longitudinal direction of the metal pipe 2. It is defined by an angle formed by two straight lines SL3 and SL4 of a straight line SL4 connecting the end 4b and the center of the metal tube 2.
　図８には、比較形態のねじ部の形成方法と、本実施形態のねじ部の形成方法とをそれぞれ示す。
　図８（ａ）に示す比較形態の形成方法では、図９に示した成形ロール３０１を第１成形ロールとして用いた。第１成形ロール３０１の第１周面３１４には、２つの第１凸条部３０１ａ、３０１ｂが設けられている。これにより、金属管２の成形時に、第１凸条部３０１ａ、３０１ｂが隣り合う箇所においては、２つの第１凸条部３０１ａ、３０１ｂが金属管２に同時に接触して加工がなされる。２つの第１凸条部３０１ａ、３０１ｂによって同時に加工を受けた箇所では、隣り合う第１凸条部３０１ａ、３０１ｂの２か所で素材が拘束される結果、金属管２がその長手方向に両方から引っ張られるため、素材が減肉され、減肉された箇所を起点として加工後の金属管２に割れが発生しやすくなる。 FIG. 8 shows a method of forming the threaded portion of the comparative embodiment and a method of forming the threaded portion of the present embodiment.
In the forming method of the comparative example shown in FIG. 8A, the forming roll 301 shown in FIG. 9 was used as the first forming roll. The first circumferential surface 314 of the first forming roll 301 is provided with two first ridges 301a and 301b. As a result, when forming the metal pipe 2, the two first protruding streaks 301a and 301b are simultaneously in contact with the metal pipe 2 at the locations where the first protruding streaks 301a and 301b are adjacent to each other and are processed. At the location where the two first protruding streaks 301a and 301b are processed at the same time, the material is constrained at the two adjacent first protruding streaks 301a and 301b, and as a result, the metal tube 2 is stretched in both longitudinal directions. Since the metal pipe 2 is pulled from the metal tube 2, the material is thinned, and cracks are likely to occur in the metal pipe 2 after processing starting from the thinned portion.
　一方、図８（ｂ）に示す本実施形態の形成方法では、図１に示した第１成形ロール１１を用いた。第１成形ロール１１の第１外周面１４には、一つの第１凸条部１５が周方向に沿って１周未満の長さで螺旋状に設けられている。これにより、金属管２の成形時に、第１凸条部１５の一端１５ａが金属管２に先に接触し、他端１５ｂが最後に接触するようになる。つまり、金属管２は、第１凸条部１５の異なる箇所によって同時に加工を受けることがない。そのため、加工時に金属管２に加わる応力が小さくなり、素材の減肉量を比較形態に比べて小さくすることができる。これにより、割れの発生が抑制されるようになる。したがって、金属管２の素材を普通鋼よりも割れが発生しやすいステンレス鋼とした場合においても、ねじ部３の形成による割れの発生を防止できる。 On the other hand, in the forming method of this embodiment shown in FIG. 8(b), the first forming roll 11 shown in FIG. 1 was used. On the first outer peripheral surface 14 of the first forming roll 11, one first protruding portion 15 is spirally provided along the circumferential direction with a length of less than one turn. As a result, when the metal pipe 2 is formed, the one end 15a of the first protruding portion 15 comes into contact with the metal pipe 2 first, and the other end 15b comes into contact last. In other words, the metal pipe 2 is not processed at different locations of the first protruding streak portion 15 at the same time. Therefore, the stress applied to the metal tube 2 during processing is reduced, and the amount of thinning of the material can be reduced compared to the comparative embodiment. As a result, the occurrence of cracks is suppressed. Therefore, even if the material of the metal tube 2 is stainless steel, which is more prone to cracking than ordinary steel, the occurrence of cracking due to the formation of the threaded portion 3 can be prevented.
　以下、本実施形態の給油管の製造方法のより好ましい形態について説明する。
　上記の実施形態では、成形工程において、第１成形ロール１１回転速度ｖｏ（単位：rad／秒）と第２成形ロール２１の回転速度ｖｉ（単位：rad／秒）との比の絶対値ｖ（＝｜ｖｏ／ｖｉ｜）が、下記式（１）を満たすように、第１成形ロール１１及び第２成形ロール２１の回転速度を調整することが好ましい。これにより、図３に示すように、第１凸条部１５と第２凸条部２５との間のクリアランスＣが、極端に大きくなったり、極端に小さくなることがなく、溝部３ａの形成時に金属管２が破断することが防止される。 A more preferable form of the method for manufacturing the oil supply pipe of the present embodiment will be described below.
In the above embodiment, in the forming step, the absolute value v ( =|vo/vi|), it is preferable to adjust the rotation speeds of the first forming roll 11 and the second forming roll 21 so that the following formula (1) is satisfied. As a result, as shown in FIG. 3, the clearance C between the first ridge portion 15 and the second ridge portion 25 does not become extremely large or extremely small. Breakage of the metal tube 2 is prevented.
　θｏ／θ≧ｖ≧（θｏ／（Ｐθ））・（２Ｒ＋ｔ／２）　…（１） 　θo/θ≧v≧(θo/(Pθ))・(2R+t/2) (1)
　なお、上記式（１）において、θ（単位：rad）は、ねじ部３をなす螺旋状の突起４の長手方向一端４ａから他端４ｂに至る間の周角度であり、θｏ（単位：rad）は第１凸条部１５の長手方向一端１５ａから他端１５ｂに至る間の周角度であり、Ｒ（単位：ｍｍ）は螺旋状の突起４の頂部４ｃの曲率半径（単位：ｍｍ）であり、ｔ（単位：ｍｍ）は金属管２の肉厚であり、Ｐはねじ部３のピッチ（単位：ｍｍ）である。 In the above formula (1), θ (unit: rad) is the circumferential angle from one end 4a to the other end 4b in the longitudinal direction of the spiral projection 4 forming the threaded portion 3, and θo (unit: rad ) is the circumferential angle from one end 15a to the other end 15b in the longitudinal direction of the first protruding portion 15, and R (unit: mm) is the radius of curvature (unit: mm) of the top portion 4c of the spiral projection 4. where t (unit: mm) is the wall thickness of the metal tube 2 and P is the pitch (unit: mm) of the threaded portion 3 .
　また、金属管２の肉厚ｔ（単位：ｍｍ）に対して、第２凸条部２５の頂部２５ａの曲率半径Ｒｉ（単位：ｍｍ）を、下記式（２）が満足する範囲とすることが好ましい。 Also, the radius of curvature Ri (unit: mm) of the top portion 25a of the second protruding portion 25 should be within a range that satisfies the following formula (2) with respect to the thickness t (unit: mm) of the metal pipe 2. is preferred.
　Ｒｉ≧（３／４）・ｔ　…（２） 　Ri≧(3/4)・t...(2)
　更に、金属管２の肉厚ｔ（単位：ｍｍ）及び螺旋状の突起４の頂部４ｃの曲率半径Ｒ（単位：ｍｍ）に対して、第１凸条部１５の頂部１５ｃの曲率半径Ｒо（単位：ｍｍ）を、下記式（３）が満足する範囲とすることが好ましい。 Furthermore, the curvature radius R ( Unit: mm) is preferably within a range that satisfies the following formula (3).
　Ｒо≧Ｒ－２ｔ　…（３） R ≥ R - 2t (3)
　更にまた、金属管２の肉厚ｔ（単位：ｍｍ）に対して、第１凸条部１５と第２凸条部２５とのクリアランスＣ（単位：ｍｍ）を、下記式（４）が満足する範囲とすることが好ましい。 Furthermore, the clearance C (unit: mm) between the first ridge portion 15 and the second ridge portion 25 with respect to the wall thickness t (unit: mm) of the metal tube 2 satisfies the following equation (4). It is preferable to set it as the range which does.
　Ｃ≧（３／２）・ｔ　…（４） 　C≧(3/2)・t...(4)
　式（２）～（４）を満たすことにより、第１凸条部１５と第２凸条部２５との間のクリアランスＣが、極端に大きくなったり、極端に小さくなることがなく、溝部３ａの形成時に金属管２が破断することが防止されるようになる。 By satisfying the formulas (2) to (4), the clearance C between the first ridge portion 15 and the second ridge portion 25 does not become extremely large or extremely small, and the groove portion 3a The breakage of the metal tube 2 during the formation of is prevented.
　また、第１凸条部１５の形状は、形成すべき螺旋状の突起４の設計値によって決まる。従って、第１凸条部１５の段差Ｐｏは、下記（５）式が満たすように設定するとよい。また、第１成形ロール１１を平面視した場合（図２Ｂを参照）における第１凸条部１５の長さｒоθоは、下記（６）式が満たすように設定することが好ましい。 Also, the shape of the first protruding streak portion 15 is determined by the design value of the spiral projection 4 to be formed. Therefore, the step Po of the first ridge portion 15 is preferably set so as to satisfy the following equation (5). In addition, it is preferable to set the length roθo of the first ridge portion 15 when the first forming roll 11 is viewed from above (see FIG. 2B) so as to satisfy the following formula (6).
　Ｐｏ＝（θ／２π）・Ｐ　…（５） 　Po=(θ/2π)・P...(5)
　（θ／２）・（Ｄ－２ｈ＋４ｔ）≧ｒоθо≧（θ／２）・（Ｄ－２ｈ＋ｔ）…（６） (θ/2)・(D−2h+4t)≧rоθо≧(θ/2)・(D−2h+t) (6)
　式（５）及び（６）において、θは、ねじ部３をなす螺旋状の突起４の長手方向一端４ａから他端４ｂに至る間の周角度（単位：rad）である。また、式（５）において、Ｐは、ねじ部３のピッチ（単位：ｍｍ）である。更に、式（６）において、Ｄは金属管２の外径（単位：ｍｍ）であり、ｈは螺旋状の突起４の高さ（単位：ｍｍ）であり、ｔは金属管２の肉厚であり、θｏ（単位：rad）は、第１ロール本体１２の中心における、第１凸条部１５の一端１５ａから他端１５ｂに至る間の周角度（単位：ｒａｄ）であり、ｒоは、第１ロール本体１２の中心から第１周面１４までの直線距離、すなわち第１ロール本体１２の半径（単位：ｍｍ）である。 In formulas (5) and (6), θ is a circumferential angle (unit: rad) from one end 4a to the other end 4b in the longitudinal direction of the helical projection 4 forming the threaded portion 3. Moreover, in Formula (5), P is the pitch (unit: mm) of the threaded portion 3 . Furthermore, in formula (6), D is the outer diameter of the metal tube 2 (unit: mm), h is the height of the spiral projection 4 (unit: mm), and t is the thickness of the metal tube 2. and θo (unit: rad) is the circumferential angle (unit: rad) from one end 15a to the other end 15b of the first protruding portion 15 at the center of the first roll body 12, and ro is It is the linear distance from the center of the first roll body 12 to the first peripheral surface 14, that is, the radius of the first roll body 12 (unit: mm).
　また、第２凸条部２５のピッチＰｉは、形成すべき螺旋状の突起４（ねじ部３）の設計値、第１凸条部１５の形状、第１成形ロール１１及び第２成形ロール２１の回転速度に基づき、下記（７）式が満たすように設定することが好ましい。 In addition, the pitch Pi of the second ridge portion 25 depends on the design value of the spiral projection 4 (thread portion 3) to be formed, the shape of the first ridge portion 15, the first forming roll 11 and the second forming roll 21. is preferably set so as to satisfy the following equation (7) based on the rotational speed of .
　Ｐｉ＝（θ／θｏ）・ｖＰ　…（７） 　Pi=(θ/θo)・vP …(7)
　式（７）において、θは、ねじ部３をなす螺旋状の突起４の長手方向一端４ａから他端４ｂに至る間の周角度（単位：rad）である。θｏ（単位：rad）は、第１ロール本体１２における、第１凸条部１５の一端１５ａから他端１５ｂに至る間の周角度（単位：ｒａｄ）である。ｖは、第１成形ロール１１回転速度ｖｏ（単位：rad／秒）と第２成形ロール２１の回転速度ｖｉ（単位：rad／秒）との比の絶対値（｜ｖｏ／ｖｉ｜）である。Ｐは、ねじ部３のピッチ（単位：ｍｍ）である。 In the formula (7), θ is the circumferential angle (unit: rad) from one end 4a to the other end 4b in the longitudinal direction of the helical projection 4 forming the threaded portion 3. θo (unit: rad) is a circumferential angle (unit: rad) from one end 15 a of the first ridge portion 15 to the other end 15 b of the first roll body 12 . v is the absolute value (|vo/vi|) of the ratio between the rotational speed vo (unit: rad/sec) of the first forming roll 11 and the rotational speed vi (unit: rad/sec) of the second forming roll 21. . P is the pitch of the screw portion 3 (unit: mm).
　以上説明したように、本実施形態の給油管の製造装置１によれば、金属管２の外周面２ａ側に第１成形ロール１１が配置され、その第１成形ロール１１には、１周未満の長さで螺旋状に設けられた第１凸条部１５が一つだけ備えられている。従って、金属管２を加工する際に、第１凸条部１５の長手方向一端１５ａ及び他端１５ｂが金属管２に同時に接触することがないため、従来のように、金属管２の素材が著しく減肉するおそれがない。これにより、金属管２の割れの発生を防止できる。
　また、本実施形態の給油管の製造方法によれば、成形工程において、１周未満の長さで螺旋状に設けられた一つの第１凸条部１５によって金属管２をなす素材を加工することで、ねじ部３を形成する。従って、従来の方法に比べて、ねじ部３に印加されるひずみを小さくすることができ、これにより、割れの発生をより確実に防止できる。 As described above, according to the oil supply pipe manufacturing apparatus 1 of the present embodiment, the first forming roll 11 is arranged on the side of the outer peripheral surface 2a of the metal pipe 2, and the first forming roll 11 has less than one turn. Only one first ridge 15 is provided spirally with a length of . Therefore, when the metal tube 2 is processed, the longitudinal direction end 15a and the other end 15b of the first protruding portion 15 do not come into contact with the metal tube 2 at the same time. There is no risk of significant thinning. Thereby, the occurrence of cracks in the metal pipe 2 can be prevented.
Further, according to the manufacturing method of the fuel supply pipe of the present embodiment, in the forming process, the material forming the metal pipe 2 is processed by the single first ridge portion 15 spirally provided with a length of less than one turn. Thus, the threaded portion 3 is formed. Therefore, the strain applied to the threaded portion 3 can be reduced as compared with the conventional method, thereby more reliably preventing the occurrence of cracks.
　特に、本実施形態のように、素管を拡径（例えば、元の径から１．５倍以上拡径）してなる拡径部を金属管２とする場合において、拡径部（金属管２）の素材が加工硬化を受けていたとしても、ねじ部３の形成時における金属管素材の減肉を低減できるため、ねじ部３の形成による割れの発生を防止できる。 In particular, as in the present embodiment, when the expanded diameter portion obtained by expanding the diameter of the raw pipe (for example, expanding the diameter by 1.5 times or more from the original diameter) is used as the metal pipe 2, the expanded diameter portion (metal pipe Even if the material of 2) is work-hardened, it is possible to reduce the thinning of the metal pipe material during the formation of the threaded portion 3, so that the occurrence of cracks due to the formation of the threaded portion 3 can be prevented.
　１…給油管の製造装置、１１…第１成形ロール、１２…第１ロール本体、１３…第１回転軸、１４…第１周面、１５…第１凸条部、１５ａ…一端、１５ｂ…他端、１５ｃ…頂部、２１…第２成形ロール、２２…第２ロール本体、２３…第２回転軸、２４…第２周面、２５…第２凸条部、２５ａ…頂部、２…金属管、２ａ…外周面、２ｂ…内周面、３…ねじ部、４…螺旋状の突起、４ａ…一端、４ｂ…他端、４ｃ…頂部。 DESCRIPTION OF SYMBOLS 1... Manufacturing apparatus of an oil supply pipe, 11... 1st forming roll, 12... 1st roll main body, 13... 1st rotating shaft, 14... 1st peripheral surface, 15... 1st protruding part, 15a... One end, 15b... Other end 15c...Top 21...Second forming roll 22...Second roll main body 23...Second rotating shaft 24...Second peripheral surface 25...Second protruding part 25a...Top 2...Metal Tube, 2a... outer peripheral surface, 2b... inner peripheral surface, 3... threaded portion, 4... helical projection, 4a... one end, 4b... other end, 4c... top portion.

Claims (2)

  1. 　金属管の外周面側に第１成形ロールを配置し、前記金属管の内周面側に第２成形ロールを配置し、前記第１成形ロール及び前記第２成形ロールによって前記金属管に対してロール成形を行うことにより、前記金属管にねじ部を形成する、給油管の製造装置であって、
    　第１回転軸、第１周面及び前記第１周面上に周方向に沿って１周未満の長さで螺旋状に設けられた一つの第１凸条部を有する前記第１成形ロールと、
    　第２回転軸、第２周面及び前記第２周面上に周方向に沿って螺旋状に設けられた第２凸条部を有する前記第２成形ロールと、が備えられ、
    　前記第１回転軸と前記第２回転軸とが平行になるように配置され、
    　前記第１成形ロールと前記第２成形ロールとが回転するように構成されている、給油管の製造装置。     A first forming roll is arranged on the outer peripheral surface side of the metal pipe, a second forming roll is arranged on the inner peripheral surface side of the metal pipe, and the metal pipe is pressed by the first forming roll and the second forming roll. An apparatus for manufacturing a lubricating pipe, wherein a threaded portion is formed in the metal pipe by roll forming,
    The first forming roll having a first rotating shaft, a first peripheral surface, and one first ridge spirally provided on the first peripheral surface along the circumferential direction with a length of less than one turn; and ,
    A second forming roll having a second rotating shaft, a second peripheral surface, and a second ridge portion spirally provided on the second peripheral surface along the circumferential direction,
    arranged so that the first rotating shaft and the second rotating shaft are parallel,
    An apparatus for manufacturing a lubricating pipe, wherein the first forming roll and the second forming roll are configured to rotate.
  2. 　金属管の外周面側に第１成形ロールを配置し、前記金属管の内周面側に第２成形ロールを配置し、前記第１成形ロール及び前記第２成形ロールによって前記金属管に対してロール成形を行うことにより、前記金属管にねじ部を形成する方法であって、
    　前記第１成形ロールとして、第１回転軸、第１周面及び前記第１周面上に周方向に沿って１周未満の長さで螺旋状に設けられた一つの第１凸条部を有する第１成形ロールと、
    　前記第２成形ロールとして、第２回転軸、第２周面及び前記第２周面上に周方向に沿って螺旋状に設けられた第２凸条部を有する第２成形ロールと、を用い、
    　前記第２成形ロールに前記金属管を挿入し、前記第１回転軸及び前記第２回転軸が相互に平行になるように配置する準備工程と、
    　前記第１成形ロール及び前記第２成形ロールを回転させつつ、前記第１凸条部によって前記金属管をなす素材を前記第２凸条部同士の間に押し込むことにより、前記金属管の内周面に、螺旋状の突起からなる前記ねじ部を形成する成形工程と、を備える給油管の製造方法。     A first forming roll is arranged on the outer peripheral surface side of the metal pipe, a second forming roll is arranged on the inner peripheral surface side of the metal pipe, and the metal pipe is pressed by the first forming roll and the second forming roll. A method for forming a threaded portion in the metal pipe by roll forming,
    As the first forming roll, a first rotating shaft, a first peripheral surface, and one first ridge portion spirally provided on the first peripheral surface along the circumferential direction with a length of less than one turn. a first forming roll having
    As the second forming roll, a second forming roll having a second rotating shaft, a second peripheral surface, and a second ridge portion spirally provided on the second peripheral surface along the peripheral direction is used. ,
    A preparation step of inserting the metal tube into the second forming roll and arranging the first rotating shaft and the second rotating shaft in parallel with each other;
    While the first forming roll and the second forming roll are rotated, the material forming the metal pipe is pushed between the second ridges by the first ridges, whereby the inner circumference of the metal pipe is A method of manufacturing an oil supply pipe, comprising a forming step of forming the threaded portion formed of a helical projection on the surface.
PCT/JP2022/024910 2021-07-27 2022-06-22 Device for manufacturing fuel filler pipe and method for manufacturing fuel filler pipe WO2023007997A1 (en)

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Publication number Priority date Publication date Assignee Title
JP3462427B2 (en) * 1999-05-27 2003-11-05 株式会社ベステックスキョーエイ Screw forming apparatus, screw forming method and oil supply pipe assembly

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3462427B2 (en) * 1999-05-27 2003-11-05 株式会社ベステックスキョーエイ Screw forming apparatus, screw forming method and oil supply pipe assembly

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