Manufacturing method of fuel tank, and fuel tank
AssigneesNippon Steel Corporation, Unipres Corporation
InventorsYasuo Takahashi, Toshinori Mizuguchi, Hirohumi Kondo, Shinji Shiokawa, Yukikazu Takahashi, Nobuhide Suzuki
Life of this patent
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Abstract
This manufacturing method of a fuel tank is for manufacturing a metallic fuel tank having a concavo-convex portion in a course of seam welding using a seam welder, wherein the seam welding is performed using the seam welder provided with a non-interfering space where interference with the fuel tank is avoided, while changing the position of the fuel tank relative to the seam welder.
Claims10
A manufacturing method of a fuel tank for manufacturing a metallic fuel tank having a concavo-convex portion using a seam welder, comprising
- performing seam welding using a seam welder provided with a welder body and a pair of electrode rings,
- wherein the seam welder has a non-interfering space between the welder body and the pair of electrode rings, said non-interfering space allowing entrance of the fuel tank during welding such that seam welding is performed continuously over said concavo-convex portion without interfering with the welder.
A method for manufacturing a metallic fuel tank having a concavo-convex portion using a seam welder, comprising performing seam welding using the seam welder,
- wherein the seam welder is provided with a welder body and a pair of electrode rings and has a non-interfering space between the welder body and the pair of electrode rings, said non-interfering space allowing entrance of the fuel tank during welding;
- wherein a depth d of the non-interfering space from a seam welding point is set to be larger than a maximum dimension Lmax of the concavo-convex portion of the fuel tank;
- and
- wherein an inverse angle is greater than 90 degrees and is smaller than 180 degrees in a concave portion which is an inverse area of the fuel tank,
- a maximum dimension Lmax of inverse sides is obtained by the following Expression (1),
- Lmax=Length of BC′×sin(90°−θ1)−Length of CC′×sin(θ1+θ2) (1)
- where a shortest straight line among two straight lines connecting an inverse point and two inverse start points;
- and two straight lines connecting an imaginary inverse point and each of the inverse start points is defined as a straight line a,
- a straight line connecting the inverse start point having a sharing relation with the straight line a, and the imaginary inverse point is defined as a straight line b,
- an angle between the straight line a and the straight line b is defined as θ1,
- an angle between a straight line c connecting the inverse point and the imaginary inverse point, and the straight line b is defined as θ2,
- the point of the inverse start points which is far from the imaginary inverse point is defined as a B point,
- the inverse point is defined as a C point, and
- the imaginary inverse point is defined as C′.
A method for manufacturing a metallic fuel tank having a concavo-convex portion using a seam welder, comprising performing seam welding using the seam welder,
- wherein the seam welder is provided with a welder body and a pair of electrode rings and has a non-interfering space between the welder body and the pair of electrode rings, said non-interfering space allowing entrance of the fuel tank during welding;
- wherein a depth d of the non-interfering space from a seam welding point is set to be larger than a maximum dimension Lmax of the concavo-convex portion of the fuel tank;
- and
- wherein
- a welding inverse angle is greater than 90 degrees and is smaller than 180 degrees in a concave portion which is an inverse area of the fuel tank,
- a maximum dimension Lmax of inverse sides is obtained by the following Expression (2)
- Lmax=Length of BC′×sin(90°−θ1′)−Length of C′C″×sin(θ1′+θ2′) (2)
- where a shortest straight line among two straight lines connecting a welding inverse point and two inverse start points;
- and two straight lines connecting an imaginary inverse point and each of the inverse start points is defined as a straight line a′,
- a straight line connecting the inverse start point having a sharing relation with the straight line a′, and the imaginary inverse point is defined as a straight line b,
- an angle between the straight line a′ and the straight line b is defined as θ1′,
- an angle between a straight line c′ connecting the welding inverse point and the imaginary inverse point, and the straight line b is defined as θ2′,
- the point of the inverse start points which is far from the imaginary inverse point is defined as a B point,
- the imaginary inverse point is defined as a C′ point, and
- the welding inverse point is defined as C″.
A method for manufacturing a metallic fuel tank having a concavo-convex portion using a seam welder, comprising performing seam welding using the seam welder,
- wherein the seam welder is provided with a welder body and a pair of electrode rings and has a non-interfering space between the welder body and the pair of electrode rings, said non-interfering space allowing entrance of the fuel tank during welding;
- wherein a depth d of the non-interfering space from a seam welding point is set to be larger than a maximum dimension Lmax of the concavo-convex portion of the fuel tank;
- and
- wherein
- BCDEFG which is provided in the fuel tank, includes an inverse area, and forms a concave portion formed by connected straight lines, when:
- an angle α between an inverse side CD including a C point as an inverse start point, and a non-inverse side BC before reaching the C point is greater than 90 degrees and is smaller than 180 degrees;
- and an angle β between an inverse side EF including an F point as an inverse start point, and a non-inverse side FG after reaching the F point is greater than 90 degrees and is smaller than 180 degrees,
- the maximum dimension Lmax of inverse sides is obtained by the following Expression (3),
- Lmax=Length of CG×sin α, or Lmax=Length of BF×sin β (3)
- where an inflection point in an extension direction headed to the C point as seen from the F point is defined as a B point, and
- an inflection point in an extension direction headed to the F point as seen from the C point is defined as a G point.
A method for manufacturing a metallic fuel tank having a concavo-convex portion using a seam welder, comprising performing seam welding using the seam welder,
- wherein the seam welder is provided with a welder body and a pair of electrode rings and has a non-interfering space between the welder body and the pair of electrode rings, said non-interfering space allowing entrance of the fuel tank during welding;
- wherein a depth d of the non-interfering space from a seam welding point is set to be larger than a maximum dimension Lmax of the concavo-convex portion of the fuel tank;
- and
- wherein
- BCDEFG which is provided in the fuel tank, includes an inverse area, and forms a concave portion formed by connected straight lines, when:
- an angle α′ between a non-inverse side BC before reaching a C point as an inverse start point, and a welding line after passing through the C point is greater than 90 degrees and is smaller than 180 degrees;
- and an angle β′ between a non-inverse side FG after reaching an F point as an inverse start point, and a welding line after passing through the F point is greater than 90 degrees and is smaller than 180 degrees,
- the maximum dimension Lmax of inverse sides is obtained by the following Expression (4),
- Lmax=Length of CG×sin α′, or Lmax=Length of BF×sin β′ (4)
- where an inflection point in an extension direction headed to the C point as seen from the F point is defined as a B point, and
- an inflection point in an extension direction headed to the F point as seen from the C point is defined as a G point.
A manufacturing method of a fuel tank for manufacturing a metallic fuel tank having a welded concavo-convex portion in plan view therein using a seam welder, comprising performing seam welding using a seam welder provided with a welder body and a pair of electrode rings, wherein the seam welder has a non-interfering space between the welder body and the pair of electrode rings, said non-interfering space allowing entrance of the fuel tank during welding such that seam welding is performed continuously over said concavo-convex portion without interfering with the welder.
Dependencies are inferred from the claim text.