JP6041352B2 - Manufacturing method of bogie frame for railway vehicles - Google Patents

Description

  The present invention relates to a method for manufacturing a railcar bogie, and more particularly, to a manufacturing method that can suppress stress corrosion cracking of a bogie frame made of an aluminum alloy.

  There are many types of aluminum alloys ranging from 2000 series to 7000 series depending on the kind of additive. In particular, a 7000 series aluminum alloy to which magnesium (Mg), silicon (Si), and zinc (Zn) is added has a very high specific strength that surpasses steel materials. In addition, the 7N01 alloy among the 7000 series is capable of fusion welding and, unlike other aluminum alloys, in which the strength of the weld is often significantly lower than that of the base metal, It has the characteristic that the strength is greatly improved.

  However, when these 7000 series aluminum alloys are used in a state where tensile residual stress exists in a corrosive environment, stress corrosion cracking SCC (Stressed Corrosion Cracking) may occur along the grain boundary.

  Regarding such a problem, Patent Document 1 discloses that a high-pressure plasma is generated by a laser having a short pulse and high peak output, and the surface of the material such as a welded part and a cast material is peened and finely deformed by the shock wave. A method for improving the fatigue strength, corrosion resistance, and the like by increasing the strength of a welded joint or cast material by obtaining residual stress is disclosed.

  Further, in Patent Document 2, a build-up layer is formed on each butt surface of each pipe, a groove is formed in each build-up layer, and each groove is opposed to perform butt welding of the pipe and the pipe. A weld metal part is formed between the groove of each pipe, and a dendrite extending in a direction perpendicular to the weld line of the build-up layer from the boundary between the base material of the pipe and the build-up layer is formed in the build-up layer of each pipe. A method for suppressing the occurrence of stress corrosion cracking in the thickness direction of a structural member to be welded by forming the structure is disclosed.

JP 2006-122969 A JP2012-030237A

  However, in the prior art, when assembling an aluminum alloy by welding, the plate material formed by rolling suppresses stress corrosion cracking that breaks along the crystal grain boundary of the aluminum alloy as the weld bead cools. Is not considered.

  The present invention has been made in view of these problems, and relates to a bogie frame for a railway vehicle in which an aluminum alloy is assembled by welding. Yes.

  In order to solve the above problems, the present invention employs the following means. In the manufacturing method of a bogie frame for a railway vehicle having a side beam made of aluminum alloy that is spaced along the rail direction and a side beam made of aluminum alloy that connects the central portions in the longitudinal direction of the side beam, The top end of the vertical piece of the upper side beam whose cross-sectional shape in the direction is formed in an inverted U shape is the end in the width direction of the lower side beam having a width direction dimension larger than the width direction dimension of the upper side beam. After butting and welding, while rotating a cylindrical rotary tool made of a material harder than the material of the side beam around its axis, the longitudinal end surface of the rotary tool is set to a vertical surface in the width direction of the lower side beam. It is characterized by moving along the vertical plane while pressing.

  In the present invention, the end of the cylindrical transverse beam inserted into the opening formed in the center in the longitudinal direction of the side beam and the peripheral edge of the opening are joined by welding, and the cylindrical After rotating the rotary tool around its axis after welding the end of the cross beam in the vicinity of the cut surface cut by a cross section that intersects the longitudinal direction and the closing plate that covers the tip of the cylindrical cross beam And moving along the cutting surface while pressing the end face in the longitudinal direction of the rotary tool against the surface of the cutting surface.

  Since this invention is provided with the above structure, it can manufacture the bogie frame for rail vehicles which a stress corrosion crack does not produce easily.

FIG. 1 is a side view of a railway vehicle carriage. FIG. 2 is an enlarged perspective view of a portion A of the railway vehicle carriage shown in FIG. FIG. 3 is an enlarged perspective view of a portion B of the railcar bogie shown in FIG. FIG. 4 is a perspective view of a joint portion between a side beam and a side beam forming a carriage frame. FIG. 5 is a perspective view of the bogie frame. 6 is a perspective view of an AA cross section of the bogie frame shown in FIG. FIG. 7 is a perspective view of the BB cross section of the bogie frame shown in FIG. FIG. 8 is a perspective view of a cross section CC of the bogie frame shown in FIG. FIG. 9 is a perspective view of a bogie frame including end beams.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 is a side view of a railway vehicle carriage. In FIG. 1, a railcar bogie 1 includes a side beam 10 that is spaced along the rail direction, a horizontal beam 20 that connects the central portions of the side beams 10 in the longitudinal direction (rail direction), and an upper side of the horizontal beam 20. The cross beam 5 is provided along the longitudinal direction of the cross beam 20 (the sleeper direction), and a wheel shaft 80 including a wheel and an axle. A plurality of side beams 10 and cross beams 20 are provided, and the side beams 10 arranged apart from each other along the rail direction are connected to each other via the cross beams 20 arranged apart from each other along the sleeper direction. And configured as a bogie frame made of aluminum alloy. Air springs 60 are provided on the upper surfaces of both ends in the longitudinal direction (sleeper direction) of the pillow beam 5, and a vehicle body (two-dot chain line) is placed on the upper surfaces of the air springs 60.

  FIG. 2 is an enlarged perspective view of a portion A of the railway vehicle carriage shown in FIG. In FIG. 2, the side beam 10 is welded to the upper side beam 10 a whose vertical cross-sectional shape in the longitudinal direction (rail direction) 100 is formed in an inverted U shape, and to the lower end portion of the vertical piece 10 a 1 of the upper side beam 10 a. The bottom plate 10b is formed in the shape of a square pipe. The upper side beam 10a and the lower lower plate 10b are made of aluminum alloy plates, and these plates are rolled in the rolling direction 200 and formed into a plate shape. After the plate thickness is adjusted by rolling, the upper side beam 10a is subjected to bending processing and formed into a shape having an inverted U-shaped cross-sectional shape. The dimension in the width direction 110 of the lower plate 10b is set larger than the dimension in the width direction 110 of the upper side beam 10a. After placing the upper side beam 10a on the upper surface of the lower plate 10b, the side beam 10 has a butt portion between the end portion of the lower plate 10b in the width direction 110 and the lower end portion of the vertical piece 10a1 of the upper side beam 10a. The side beams 10 are assembled by continuous welding along the longitudinal direction 100. Therefore, the weld bead 74 is basically formed only on the upper surface of the lower plate 10b and is not formed on the side surface (end surface) a of the lower plate 10b.

  Because the weld bead 74 is formed in the vicinity of the side surface a of the end portion in the width direction 110 of the lower plate 10b forming the side beam 10 assembled by continuous welding, and the side surface a intersects the rolling direction 200. As the weld bead 74 is cooled, a tensile residual stress that is pulled in the height direction 120 of the side beam 10 is likely to be generated on the surface (vertical surface) of the side surface a. For this reason, stress corrosion cracking (SCC: Stress Corrosion Cracking) may occur on the side surface (end surface) a of the lower plate 10b formed by rolling along the crystal grain boundary of the aluminum alloy.

  Therefore, in order to prevent this stress corrosion cracking, a cylindrical rotary tool 70 made of a harder material of an aluminum alloy is prepared, and while the rotary tool 70 is rotated around its axis, the length of the rotary tool 70 is increased. The direction end surface is moved in the direction of the arrow 72 along the side surface (end surface) a while pressing the end surface of the lower plate 10 b against the surface (vertical surface) of the side surface (end surface) a. This process generates high-temperature frictional heat and high pressure between the end surface of the rotary tool 70 and the side surface (end surface) a of the lower plate 10b. As a result, it is possible to obtain the modified surface 76 that releases the residual tensile stress. As a result, it is possible to suppress the occurrence of stress corrosion cracking that occurs on the side surface (end surface) a of the lower plate 10b.

  At this time, it is desirable to use a rotary tool 70 whose outer diameter is larger than the thickness of the lower plate 10b.

  FIG. 3 is an enlarged perspective view of a portion B of the railcar bogie shown in FIG. In FIG. 3, the pillow beam 5 is configured by joining a plurality of hollow extruded shapes 6 made of an aluminum alloy extruded in the direction of the extrusion direction 300. In the vicinity of the end face of the hollow extruded member 6 in the extrusion direction 300, a closing plate 7 is joined by welding.

  Since stress generated in the process of extrusion may remain on the cut surface c obtained by cutting the hollow extruded member 6 with a cross section intersecting the extrusion direction 300, stress corrosion cracking may occur on the cut surface c. Further, when the closing plate 7 is welded in the vicinity of the cut surface c as shown in FIG. 3, the weld bead 74 is cooled and contracts, so that tensile residual stress tends to remain in the surface of the cut surface c. It may cause stress corrosion cracking.

  Therefore, in order to prevent this stress corrosion cracking, a cylindrical rotary tool 70 made of a harder material of an aluminum alloy is prepared, and the end face in the longitudinal direction is cut while rotating the rotary tool 70 around its axis. It moves along the cut surface c while pressing the surface (vertical surface) of the surface c. Due to this process, high-temperature frictional heat and high pressure are generated between the end face of the rotary tool 70 and the cut surface c, so that the grain boundary of the cut surface c is refined and the residual tensile stress is released. 76 can be obtained. As a result, it is possible to suppress the occurrence of stress corrosion cracks generated on the cut surface c.

  FIG. 4 is a perspective view of a joint portion between the lateral beam 20 and the side beam 10 forming the carriage frame. Descriptions relating to configurations similar to those described in detail with reference to FIGS. 1 to 3 are omitted, and specific configurations in FIG. 4 are described in detail. In FIG. 4, the side beam 10 includes an upper side beam 10 a whose vertical cross section in the longitudinal direction is formed in an inverted U shape, and a bottom plate 10 b that is welded to the lower end of the vertical piece of the upper side beam 10 a. It has a square pipe shape.

  On the other hand, the cross beam 20 is a round pipe made of an aluminum alloy, and is obtained by cutting a hollow extruded shape extruded in the extrusion direction 300 into a predetermined length. The side beam 10 has a side surface (corresponding to the vertical piece 10a1 in FIG. 2) at the center in the longitudinal direction, and an opening through which the horizontal beam 20 passes is processed. The horizontal beam 20 is inserted into the opening and opened. The peripheral edge of the part and the cross beam 20 are joined by welding. Further, a closing plate 7 is welded to the end face of the horizontal beam 20 protruding in a manner penetrating the side beam 10, and both longitudinal end faces of the round pipe-shaped horizontal beam 20 are closed. After the end face of the cross beam 20 is closed with the closing plate 7, the cross beam 20 may be welded to the opening provided in the central portion of the side beam 10, and then the side beam 10 and the cross beam 20 may be welded. The lateral beam 20 is fixed to an opening provided at the center of the side beam 10 and the side beam 10 and the lateral beam 20 are welded to each other, and then the longitudinal end of the cylindrical lateral beam 20 is closed. It may be sealed by welding.

  In the same manner as the hollow extruded shape 6 constituting the pillow beam 5, the stress generated during the extrusion process remains on the cut surface c obtained by cutting the hollow extruded shape forming the cross beam 20 at a cross section intersecting the extrusion direction. In some cases, the residual stress may cause stress corrosion cracking in the cut surface c. Further, as shown in FIG. 4, when the closing plate 7 is welded in the vicinity of the cut surface c, the weld bead 74 of the side beam 10 and the lateral beam 20 is cooled and contracts, so that it is within the plane of the cut surface c. Tensile residual stress tends to remain and may cause stress corrosion cracking.

  Therefore, in order to prevent this stress corrosion cracking, a cylindrical rotary tool 70 made of a harder material of aluminum alloy is prepared, and the end face in the longitudinal direction is set while rotating the rotary tool 70 about the axis. It moves along the cut surface c while pressing the surface of the cut surface c. Due to this process, high-temperature frictional heat and high pressure are generated between the end face of the rotary tool 70 and the cut surface c, so that the grain boundary of the cut surface c is refined and the residual tensile stress is released. 76 can be obtained. As a result, it is possible to suppress the occurrence of stress corrosion cracks generated on the cut surface c.

  FIG. 5 is a perspective view of a bogie frame of a bogie for a railway vehicle. In FIG. 5, the bogie frame of the bogie for a railway vehicle connects two side beams 10 spaced apart along the rail direction, and the central portions 2 in the longitudinal direction (rail direction) 100 of each side beam 10. It is comprised from the two connecting beams 30 etc. which connect the center part of the longitudinal direction (sleeper direction) 110 of the horizontal beam 20 and the horizontal beam 20 of each book.

  6 is an enlarged perspective view of the AA cross section of the bogie frame shown in FIG. In FIG. 6, the side beam 10 is composed of an upper side beam 10a whose vertical cross section in the longitudinal direction is formed in an inverted U shape, and a bottom plate 10b which is welded against the lower end of the vertical piece of the upper side beam 10a. Has been. As described in detail with reference to FIG. 2, stress corrosion cracking may occur on the side surface (end surface) a of the lower plate 10 b.

  Therefore, in order to prevent this stress corrosion cracking, a cylindrical rotary tool 70 made of a harder material of an aluminum alloy is prepared, and the longitudinal end face is lowered while rotating the rotary tool 70 about the axis. The plate 10b is moved in the direction of the arrow 72 along the side surface (end surface) a while being pressed against the surface of the side surface (end surface) a. This process generates high-temperature frictional heat and high pressure between the end surface of the rotary tool 70 and the side surface (end surface) a of the lower plate 10b, so that the grain boundaries on the side surface (end surface) a of the lower plate 10b are finely defined. As a result, it is possible to obtain the modified surface 76 that releases the residual tensile stress. As a result, it is possible to suppress the occurrence of stress corrosion cracking that occurs on the side surface a of the lower plate 10b.

  FIG. 7 is an enlarged perspective view of the cross section BB of the bogie frame shown in FIG. In FIG. 7, the cross beam 20 is a cross-girder structure in which a vertical section in the longitudinal direction (sleeper direction) 110 of the cross beam 20 is configured by four plates, and an upper plate 20 a and a lower plate 20 b disposed at a horizontal height, And two vertical plates 20c arranged in the vertical direction. The upper plate 20a, the lower plate 20b and the vertical plate 20c are made of aluminum alloy plates, and these plates are formed into a plate shape by rolling. The dimensions in the width direction 100 of the upper plate 20a and the lower plate 20b are set slightly larger than the dimensions in the width direction 100 of the two vertical plates 20c.

  In the cross beam 20, two vertical plates 20c are disposed between the upper plate 20a and the lower plate 20b, and both ends in the height direction of the vertical plate 20c are arranged in the width direction 100 of the upper plate 20a and the lower plate 20b. And is assembled by welding the butted portion along the longitudinal direction 110 of the cross beam 20. The weld beads 74 are not formed on the side surfaces a of the upper plate 20a and the lower plate 20b, but are formed on the side surfaces of both ends in the height direction of the vertical plate 20c. In the vicinity of the welded portion, stress corrosion cracking may occur on the side surfaces (end surfaces) a of the upper plate 20a and the lower plate 20b for the reasons described above.

  Therefore, in order to prevent this stress corrosion cracking, a cylindrical rotary tool 70 made of a harder material of aluminum alloy is prepared, and the end face in the longitudinal direction is set while rotating the rotary tool 70 about the axis. The upper plate 20a and the lower plate 20b are moved in the direction of the arrow 72 along the side surface (end surface) a while being pressed against the surface of the side surface (end surface) a. By this process, high-temperature frictional heat and high pressure are generated between the end surface of the rotary tool 70 and the side surfaces (end surfaces) a of the upper plate 20a and the lower plate 20b, and therefore the side surfaces (end surfaces) of the upper plate 20a and the lower plate 20b. ) It is possible to obtain a modified surface 76 in which the grain boundary of a is refined and the residual tensile stress is released. As a result, it is possible to suppress the occurrence of stress corrosion cracks generated on the side surfaces (end surfaces) a of the upper plate 20a and the lower plate 20b.

  Further, when the cross beam 20 is configured using a plate material having a cross-girder structure, similarly to the case of using the round pipe cross beam 20 shown in FIG. In the cut surface c (not shown), stress generated in the process of extrusion molding may remain, and stress corrosion cracking may occur in the cut surface c due to these residual stresses. Further, when a closing plate (not shown) is welded in the vicinity of the cut surface c, the weld bead 74 between the side beam 10 and the lateral beam 20 is cooled and contracts, so that there is a tensile residual in the plane of the cut surface c. Stress tends to remain and may cause stress corrosion cracking.

  Therefore, in order to prevent this stress corrosion cracking, a cylindrical rotary tool 70 made of a harder material of an aluminum alloy is prepared, and the longitudinal end face of the rotary tool 70 is rotated while rotating about the axis. Is moved along the cut surface c while being pressed against the surface of the cut surface c. Due to this process, high-temperature frictional heat and high pressure are generated between the end face of the rotary tool 70 and the cut surface c, so that the grain boundary of the cut surface c is refined and the residual tensile stress is released. Can be obtained. As a result, it is possible to suppress the occurrence of stress corrosion cracks generated on the cut surface c.

  FIG. 8 is an enlarged perspective view of a cross section CC of the bogie frame shown in FIG. In FIG. 8, the connecting beam 30 is composed of an upper plate 30a and a lower plate 30b that are spaced apart in the horizontal direction and two vertical plates that are spaced apart in the vertical direction. The vertical cross-sectional shape in the longitudinal direction 110 is a square pipe shape. The upper plate 30a, the lower plate 30b, and the vertical plate 30c are made of aluminum alloy plates, and these plates are formed into a plate shape by rolling and then processed into predetermined dimensions. The dimensions in the width direction 100 of the upper plate 30a and the lower plate 30b are set to be the same as the width direction dimensions of the two vertical plates 20c. The connecting beam 30 includes two vertical plates 30c between the upper plate 30a and the lower plate 30b, both ends of the upper plate 30a and the lower plate 30b in the width direction 100, and both ends in the height direction of the vertical plate 30c. The abutted portions are joined together along the longitudinal direction 110 of the beam 30 and assembled.

  Therefore, the weld bead 74 slightly melts into the side surfaces (end surfaces) a of the upper plate 30a and the lower plate 30b. In the vicinity of the weld, stress corrosion cracking may occur on the side surfaces (end surfaces) a of the upper plate 30a and the lower plate 30b for the reasons described above.

  Therefore, in order to prevent this stress corrosion cracking, a cylindrical rotary tool 70 made of a harder material of an aluminum alloy is prepared, and the end face in the longitudinal direction is turned upward while rotating the rotary tool 70 about its axis. The plate 30a and the lower plate 30b are moved in the direction of the arrow 72 along the side surface (end surface) a while being pressed against the surface (vertical surface) of the side surface (end surface) a. By this process, high-temperature frictional heat and high pressure are generated between the end surface of the rotary tool 70 and the side surfaces (end surfaces) a of the upper plate 30a and the lower plate 30b, and therefore the side surfaces (end surfaces) of the upper plate 30a and the lower plate 30b. ) It is possible to obtain a modified surface 76 in which the grain boundary of a is refined and the residual tensile stress is released. As a result, it is possible to suppress the occurrence of stress corrosion cracks generated on the side surfaces (end surfaces) a of the upper plate 30a and the lower plate 30b.

  FIG. 9 is a perspective view of the bogie frame of the bogie for railcars provided with end beams connecting the longitudinal ends of the side beams 10 at both ends in the longitudinal direction 100 of the bogie frame shown in FIG. In FIG. 9, the bogie frame connects the two side beams 10 separated in the rail direction described in FIG. 5 and the central portions of the side beams 10 in the longitudinal direction 100 (rail direction). It is composed of two lateral beams 20 and two bridges (end beams) 40 that connect both end portions in the longitudinal direction 100 of each side beam 10.

  The configurations shown in FIGS. 6 to 8 can be applied to the AA cross section of the side beam 10, the BB cross section of the lateral beam 20, and the CC cross section of the end beam 40, respectively. 2 and 6 (side beams), FIG. 7 (lateral beams), and FIG. 8 (joint beams) when the plate members constituting the side beams 10, the side beams 20, and the end beams 40 are assembled by welding. A carriage frame that can suppress stress corrosion cracking can be configured by performing construction that can suppress stress corrosion cracking that occurs on the end face of the plate material positioned in the vicinity of the welded portion.

  For example, as a plate material made of an aluminum alloy that constitutes the end beam 40 that connects both ends in the longitudinal direction of the side beam 10, the dimension in the width direction is an upper portion between an upper plate and a lower plate (not shown). A plurality of vertical plates (not shown) smaller than the width dimension of the plate and the lower plate are arranged, and both ends of the vertical plate in the height direction are butted against the width direction ends of the upper plate and the lower plate. After rotating the rotary tool 70 around its axis, the longitudinal end face of the rotary tool 70 is moved along the vertical plane while pressing the vertical end faces of the upper and lower plates in the width direction. In addition, stress corrosion cracks that occur on the vertical surfaces in the width direction of the upper and lower plates can be suppressed.

  In addition, as a plate material made of aluminum alloy that constitutes an end beam that connects both ends in the longitudinal direction of the side beam 10, the dimension in the width direction between the upper plate and the lower plate (not shown) is the upper plate. And a vertical plate (not shown) having the same size as the width of the lower plate is disposed, and both ends of the upper plate and the lower plate in the width direction are butted against both ends of the vertical plate in the height direction. , While rotating the rotary tool 70 about its axis, moving the longitudinal end surface of the rotary tool 70 along the vertical plane while pressing the end face in the width direction of the upper plate and the lower plate, Stress corrosion cracking that occurs on the vertical surface in the width direction of the lower plate can be suppressed.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Carriage, 5 ... Pillow beam, 6 ... Extrusion profile, 7 ... Closing plate, 10 ... Side beam, 20 ... Cross beam, 30 ... Connecting beam, 40 ... End beam, 60 ... Air spring, 80 ... Wheel axis, 70 ... Rotating tool, 72... Rotating tool traveling direction, 74, weld bead, 76, modified surface, a, surface intersecting the rolling direction, b, surface along the rolling direction, c, surface intersecting the extrusion direction, 100,. Longitudinal direction, 110 ... width direction, 120 ... height direction, 200 ... rolling direction (plate material), 300 ... extrusion direction (extruded profile).

Claims (7)

Side beams made of aluminum alloy separated along the rail direction;
A lateral beam made of aluminum alloy that connects the central portions of the side beams in the longitudinal direction;
In the manufacturing method of the bogie frame for railway vehicles having
Bending by rolling is performed, that the longitudinal direction of the sectional shape of the distal end portion of the vertical piece of molded upper side beam in an inverted U-shape, having a larger width dimension than the width dimension of the upper side beams After welding to the end in the width direction of the lower side beam formed by rolling into a shape ,
While rotating a cylindrical rotary tool made of a material harder than the material of the side beam around its axis, the end face in the longitudinal direction of the rotary tool is a surface that intersects the rolling direction at the time of molding the lower side beam. Te, moving along the vertical plane while pressing on the vertical plane in the width direction of the lower side beam,
The manufacturing method of the bogie frame for rail vehicles characterized by these. It is a manufacturing method of the bogie frame for rail vehicles according to claim 1,
A closing plate that is inserted into an opening formed in the central portion of the side beam in the longitudinal direction and welds the distal end portion of the cylindrical horizontal beam by extrusion molding and the peripheral edge of the opening portion to close the distal end portion. After welding
While rotating the rotary tool around its axis, while pressing the end face in the longitudinal direction of the rotary tool against the end face of the tip portion, along the cut surface cut along the cross section intersecting the extrusion direction during extrusion molding Moving
The manufacturing method of the bogie frame for rail vehicles characterized by these. It is a manufacturing method of the bogie frame for rail vehicles according to claim 1,
The transverse beams are placed by welding the lower end portions of two opposing vertical plates on the upper surface of the lower plate in the width direction, and the upper plate in the width direction on the upper end of the vertical plate. After placing and welding,
Moving along the vertical surface while rotating the rotary tool around its axis while pressing the longitudinal end faces of the rotary tool against the vertical surfaces of the upper and lower plates in the width direction;
The manufacturing method of the bogie frame for rail vehicles characterized by these. It is a manufacturing method of the bogie frame for rail vehicles according to claim 3,
The railcar bogie frame includes a connecting beam made of aluminum alloy that connects the central portions of the transverse beams in the longitudinal direction, and the connecting beam has lower ends of two opposing vertical plates in the width direction of the lower plate. After placing and welding on the upper surface of the end portion of the top plate, the end portion in the width direction of the upper plate is placed on the upper end portion of the vertical plate and welded.
Moving along the vertical surface while rotating the rotary tool around its axis while pressing the longitudinal end faces of the rotary tool against the vertical surfaces of the upper and lower plates in the width direction;
The manufacturing method of the bogie frame for rail vehicles characterized by these. A method for manufacturing a bogie frame for a railway vehicle according to claim 3 or 4,
The bogie frame for railway vehicles includes end beams that connect both ends in the longitudinal direction of the side beams, and the end beams are formed by connecting the lower end portions of two opposing vertical plates to the end portions in the width direction of the lower plate. After placing and welding on the upper surface, placing the end of the upper plate in the width direction on the upper end of the vertical plate and welding,
Moving along the vertical surface while rotating the rotary tool around its axis while pressing the longitudinal end faces of the rotary tool against the vertical surfaces of the upper and lower plates in the width direction;
The manufacturing method of the bogie frame for rail vehicles characterized by these. It is a manufacturing method of the bogie frame for rail vehicles according to claim 5,
As an aluminum alloy plate material constituting an end beam connecting both ends in the longitudinal direction of the side beam, the width direction dimension between the upper plate and the lower plate is the width direction of the upper plate and the lower plate. A vertical plate having the same dimensions as that of the upper plate and the lower plate, both ends in the width direction of the vertical plate are butted against both ends in the height direction of the vertical plate, and then welded.
Moving along the vertical surface while rotating the rotary tool around its axis while pressing the longitudinal end faces of the rotary tool against the vertical surfaces of the upper and lower plates in the width direction;
The manufacturing method of the bogie frame for rail vehicles characterized by these. It is a manufacturing method of the bogie frame for rail vehicles of any 1 paragraph among Claims 1-6,
A pillow beam made of an extruded material made of aluminum alloy is provided above the horizontal beam along the longitudinal direction of the horizontal beam, and the pillow beam is disposed along the longitudinal direction of the horizontal beam. And after welding a closing plate that closes the end face in the extrusion direction of the pillow beam,
Moving along the end face while rotating the rotary tool around its axis while pressing the end face in the longitudinal direction of the rotary tool against the end face;
The manufacturing method of the bogie frame for rail vehicles characterized by these.

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