WO2023007997A1 - 給油管の製造装置及び給油管の製造方法 - Google Patents
給油管の製造装置及び給油管の製造方法 Download PDFInfo
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- 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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- Prior art keywords
- forming roll
- forming
- peripheral surface
- pipe
- metal pipe
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000446 fuel Substances 0.000 title abstract description 14
- 239000000945 filler Substances 0.000 title abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 103
- 239000000463 material Substances 0.000 claims abstract description 16
- 230000002093 peripheral effect Effects 0.000 claims description 64
- 230000001050 lubricating effect Effects 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- 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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Abstract
Description
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。
[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。
本実施形態の給油管の製造装置について説明する。
次に、本実施形態の給油管の製造方法について説明する。
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。
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。
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。
Claims (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、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。 - 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。
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