JP5899913B2 - Bogie frame for railcar and manufacturing method, and bogie equipped with the bogie frame - Google Patents

Description

  The present invention relates to a railcar bogie frame and manufacturing method, and a bogie equipped with the bogie frame.

  The railcar bogie frame extends along the longitudinal direction of the bogie and supports a wheel shaft rotatably, and a pair of side beams for supporting a vehicle structure mounted thereon via a spring means such as an air spring. And a transverse beam extending in the width direction of the carriage between the side beams and crossing the side beams and joined by welding. The horizontal beam of such a bogie frame has a mainstream structure using a pipe steel pipe such as STKM material (carbon steel pipe for mechanical structure as a machine part), and this pipe steel pipe is used for driving a railway vehicle. The main motor, gear box with a built-in gear mechanism that transmits rotation between the main motor output shaft and the wheel shaft, and truck-related parts that receive the braking force acting on the brake during braking of railway vehicles are joined by welding. Is done.

  When welding parts, a flare joint (a kind of welded joint, arc shape and arc shape (for example, plate bent corners), or a groove shape made of arc shape and straight line) at the welded part of the pipe steel pipe and the part bracket Welded joints similar to the above are applied. Such a welded joint is welded using an arc welding method such as MAG welding (of arc welding, a mixture of an inert gas and carbon dioxide gas used in shield gas).

  Various forces such as the weight of each part to be joined and reaction force act on this weld, and stress concentrates, so it is necessary to form a hem-shaped weld bead at the bracket end of the part. A bead finishing operation using a grinder or the like is performed so as to smoothly contact each member.

  An example of a bogie frame for a railway vehicle using a side beam integrally formed from a pipe material in the bogie frame for a railway vehicle is disclosed in Patent Document 1. In the bogie frame member for railway vehicles disclosed in Patent Document 1, the side beams are plastic molded by pressing from the inside of the pipe with hydraulic pressure. Specifically, by supporting the pipe between the upper and lower molds, supplying hydraulic pressure for pressing inside the pipe, and deforming the pipe until it expands and adheres to the inner surface of the outer mold, Side beams are press molded. For example, by bending the side beam to the inner surface at the joint between the side beam and the cross beam, the groove shape is processed on the surface to increase the throat thickness of the welded joint.

JP 2001-213313 A

  In the welded portion disclosed in the above-mentioned Patent Document 1, since welding is performed up to the tangent of the pipe steel pipe (FIG. 6, details will be described later), the weld bead width becomes wide and the amount of welding (heat input) is large. Therefore, the required finishing range is widened and the dimensional accuracy is deteriorated due to welding distortion. For this reason, a great number of man-hours are required in each work step of welding, finishing, and distortion removal. Moreover, although it is a site | part with severe welding quality from being a stress concentration part, it was difficult to eliminate a defect also due to a joint shape.

Therefore, by using a pipe steel pipe hydraulic press method, etc., the weld bead width is suppressed by overhanging the pipe steel pipe by a hydraulic press into a shape that matches the shape of the bracket to be joined or the end welding shape, etc. There is a problem to be solved in terms of improvement.
SUMMARY OF THE INVENTION An object of the present invention is to provide a railcar frame for a railway vehicle capable of realizing a good welding quality by suppressing the welding bead width so as to reduce the welding amount, a manufacturing method thereof, and a railcar including such a cart frame. Is to provide a trolley.

  In order to solve the above-mentioned problems, in a pipe steel pipe constituting a cross beam using a hydraulic press method or the like, conventionally, a protruding portion that matches the shape of the end of the bracket joined to the pipe steel pipe having a circular section is formed. As a result, it is possible to reduce the weld bead width and to eliminate the need to form the bottom end of the bracket with a bead, thereby reducing the amount of welding. As a result, the required finishing range can be narrowed and the occurrence of welding distortion can also be suppressed, so that the number of work steps for welding, finishing, and distortion removal can be reduced.

A railcar bogie frame according to the present invention comprises a pair of side beams extending along the longitudinal direction of the bogie, and a pipe steel pipe extending in the width direction of the bogie between the side beams and joined to the side beams. A rail frame for a railway vehicle in which an end surface joined to the pipe steel pipe constituting the horizontal beam supports a truck-related part via a substantially rectangular bracket, and a part of the pipe steel pipe is extended and formed. An end portion of the bracket is joined to the overhang portion .

  A railcar bogie according to the present invention includes the above-described railcar bogie frame, wherein the side beam rotatably supports a wheel shaft and a vehicle structure mounted thereon via a spring means such as an air spring. It is characterized by supporting.

Furthermore, the manufacturing method of the bogie frame for a railway vehicle according to the present invention includes a pair of side beams extending along the longitudinal direction of the bogie, and extending in the width direction of the bogie between the side beams so as to be welded to the side beams. A rail beam composed of a pipe steel pipe to be joined together, and a method for manufacturing a bogie frame for a railway vehicle in which an end surface joined to the pipe steel pipe constituting the horizontal beam supports a cart-related part via a substantially rectangular bracket. After projecting a part of the pipe steel pipe constituting the transverse beam to form a substantially rectangular projecting portion with which the end surface of the bracket fits, the end of the bracket is joined to the projecting portion. Yes.

  According to the present invention, it is possible to reduce the welding amount by providing the projecting portion on the pipe steel pipe, to reduce the welding distortion by the reduced welding amount, to improve the quality such as dimensional accuracy and to reduce the number of strain removing work man-hours. In addition, by reducing the amount of welding, the bead finishing range by a grinder is narrowed, and the man-hours for finishing work can be reduced. By making the joint easy to weld, it is possible to improve the welding quality, and further, it is possible to reduce the man-hours by reducing the work steps of welding, finishing and distortion removal, and to improve the welding quality, The number of repair work can be reduced.

It is the schematic of the bogie for rail vehicles to which the bogie frame for rail vehicles by this invention is applied. It is the schematic of the bogie frame structure used for the bogie for rail vehicles shown in FIG. It is the schematic before the assembly of the cross beam used for the trolley | bogie frame structure shown in FIG. It is the schematic after the assembly and welding of the cross beam shown in FIG. It is a top view which shows an example of the cross beam structure containing the conventional bracket joint structure. It is AA sectional drawing of the cross beam structure shown in FIG. It is a top view which shows one Example of the cross beam structure by this invention. It is BB sectional drawing of the cross beam structure shown in FIG. It is a top view which shows another Example of the cross beam structure by this invention. It is CC sectional drawing of the cross beam structure shown in FIG. It is a perspective view which shows the state before bracket attachment of the cross beam structure shown in FIG. It is a perspective view which shows the state after the bracket attachment of the cross beam structure shown in FIG.

  Hereinafter, with reference to the accompanying drawings, an embodiment of a railcar bogie frame and a manufacturing method thereof according to the present invention, and a railcar bogie equipped with the bogie frame will be described. As shown in FIG. 1 which is a schematic diagram of a railcar bogie, the railcar bogie is composed of a bogie frame 1 and devices such as wheels 2 attached to the bogie frame 1 and a vehicle structure ( (Not shown) is supported through, for example, an air spring, and the vehicle 2 can travel by rolling the wheel 2 along a track (not shown).

  FIG. 2 is a perspective view schematically showing a cart frame structure used in the cart shown in FIG. As shown in FIG. 2, the carriage frame 1 includes a pair of side beams 3 and 3 extending in the longitudinal direction of the carriage frame 1 on both sides in the width direction of the carriage frame 1, and the width direction of the carriage frame 1 between the side beams 3 and 3. And the lateral beams 4 and 4 that connect the side beams 3 and 3, and a structure called the side beams 3 and 3 and the lateral beams 4 and 4 are connected to each other.

  FIG. 3 is a perspective view showing an outline of the horizontal beam 4 used in the bogie frame shown in FIG. As shown in FIG. 3, the cross beam 4 is spanned between a pair of cross beam pipe steel pipes 5, 5 extending in the width direction of the carriage frame 1 and the cross beam pipe steel pipes 5, 5 to connect the pipe steel pipes 5, 5. And a pair of spring beams 6a, 6a. The horizontal beam pipe steel pipes 5 and 5 are respectively provided with the above-mentioned collar beams 6a and 6a, and on the outside thereof, a plurality of parts such as a brake receiver 6b, a main motor receiver 6c, and a gear box suspension receiver 6d are attached. It has been.

  FIG. 4 is a perspective view showing a state in which the cross beams shown in FIG. 3 are joined by welding. As shown by a thick line in FIG. 4, as a result of attaching each component by welding as described above, a large number of weld lines 7 exist along the longitudinal direction or the circumferential direction of the horizontal beam pipe steel pipe 5. The number of man-hours for welding, finishing, and distortion removal that accompanies these many welding lines 7 is enormous.

  5 is a plan view showing an example of a cross beam structure including a conventional bracket joint structure, and FIG. 6 is a cross-sectional view taken along line AA of the cross beam structure shown in FIG. In the cross beam structure shown in FIGS. 5 and 6, when the bracket joint structure for connecting the bracket 8 to the gear box suspension 6 d is taken as an example, the linear weld 10 extending in the longitudinal direction of the cross beam pipe steel pipe 5 is particularly shown in FIG. 6. Thus, a bead is required from the end of the bracket 8 to the tangent position of the cross beam pipe steel pipe 5 (the position where the extension line of the end of the bracket 8 is tangent to the cross beam pipe steel pipe 5). It is necessary to construct the back fillet weld 11. Since the bracket 8 is welded to the transverse beam pipe steel pipe 5 having a circular cross section, at the end portion of the bracket 8 having an enlarged substantially rectangular cross section, the upper and lower portions of the bracket 8 are connected to the transverse beam pipe steel pipe 5 in a tangential manner, 8b, and on both sides of each flat portion 8b, the flat portion 8b and the cross beam pipe steel pipe 5 are three-dimensionally connected to correspond to the gap between the cross beam pipe steel pipe 5. Corner portions 8c, 8c are formed. The straight weld 10 is applied at a portion extending in the longitudinal direction (direction parallel to the axis of the horizontal beam pipe steel pipe 5) where the horizontal beam pipe steel pipe 5 and each flat portion 8b are in contact. Moreover, the cross beam welding of the horizontal beam pipe steel pipe 12 is given to the joining position of the horizontal beam pipe steel pipe 5 and each corner part 8c.

  Further, from the viewpoint of stress relaxation, for each flat portion 8b of the bracket 8, both ends along the longitudinal direction of the cross beam pipe steel pipe 5 need hem welds 9 and 9 corresponding to the corner portions 8c and 8c, Each hem weld 9 is a part that requires bead finishing by a grinder or the like so as to smoothly contact the straight weld 10 or each member. Since the main hem weld 9 has a three-dimensional shape, it is difficult to form a bead by welding and finishing. Since the welding quality is a part where stress is concentrated, complete penetration welding of the thickness of the bracket 8 is required, but careful work is also required from the aspect of quality. As described above, this structure has problems in terms of workability and quality.

7 to 12 show examples of a bracket joint structure to which a bogie frame for a rail vehicle and a manufacturing method thereof according to the present invention are applied.
A cross-sectional circle of the cross beam pipe steel pipe 5 is provided in the cross beam pipe steel pipe 5 so as to have an end shape complementary to the end portion 8a (see FIG. 12) of the bracket 8 joined to the cross beam pipe steel pipe 5 as shown in FIG. A flat overhanging portion 15 (only one is shown) that extends tangentially from the main body of the shape, and corner overhanging portions 16 and 16 that connect the cylindrical surface of the cross beam pipe steel pipe 5 on both sides of the flat overhanging portion 15. In addition, the cross section is formed in a substantially D-shape. The end surface 15a of the flat overhanging portion 15 and the end surface 16a of each corner overhanging portion 16 are connected to each other and correspond to the substantially rectangular end surface of the end portion 8a of the bracket 8.

  The flat overhanging portion 15 and the overhang of the corner overhanging portions 16 and 16 are formed by a hydraulic press method including a mold and a supplied hydraulic pressure source as disclosed in Patent Document 1. The flat projecting portion 15 is an end portion 8b formed on the conventional bracket 8 shown in FIG. 5 and FIG. 6 and is formed by projecting on the side of the horizontal beam pipe steel pipe 5, and the corner projecting portion 16 is Similarly, the corner portion 8c formed in the bracket 8 is formed so as to be extended on the side beam pipe steel pipe 5 side.

  The flat overhanging portion 15 and the corner overhanging portion 16 are subjected to a process of overhanging from the steel pipe body. The hydraulic press method is a hydraulic press method as disclosed in Patent Document 1, in which a horizontal beam pipe steel pipe 5 is sandwiched between upper and lower molds, and a liquid is injected and pressurized into the horizontal beam pipe steel pipe 5 to thereby generate a horizontal beam pipe. This is a method of forming the horizontal beam pipe steel pipe 5 into a predetermined shape by partially deforming the steel pipe 5 and pressing the deformed portion of the horizontal beam pipe steel pipe 5 against the upper and lower molds from their inner surfaces. By using this construction method, the joint structure is deformed by partially projecting the cross beam pipe steel pipe 5 to the part to which the part is attached and forming the flat projecting portion 15 and the corner projecting portion 16 from the cross beam pipe steel pipe 5. .

7 and 8, the height dimension (substantially D-shaped height dimension) H1 of the cross section perpendicular to the longitudinal direction of the hydraulic molded product 13 and the height dimensions of the end portions 8a and 8a of the bracket 8 are used. Steps 13a and 13a provided at both ends in the height direction of the flat overhanging portion 15 (see FIG. 12) of the hydroformed product 13 and the end portion of the bracket 8 have the same dimensions as H2. The plate thickness dimensions of 8a and 8a are substantially the same. With this configuration, after the end portions 8a and 8a of the bracket 8 are fitted to the step portions 13a and 13a of the flat overhanging portion 15 of the hydroformed product 13 so as to fit together, both can be joined by welding.
The butt joint between the end portions 8a and 8a of the bracket 8 and the stepped portions 13a and 13a can be the straight weld 10, and the weld bead width of the straight weld 10 can be narrowed and quality can be improved. As an incidental effect, when the bracket 8 is positioned on the hydraulic molded product 13, the overhanging portion of the hydraulic molded product 13 serves as a guide, so that the welding position can be easily determined. Moreover, since it is made to fit in the aspect fitted, welding distortion can be reduced. Moreover, since the upper surface (lower surface) of the hydraulic pressure molded product 13 and the upper surface (lower surface) of the bracket 8 are substantially the same surface, the linear welding 10 can be easily performed. Furthermore, the bracket end hem weld 9 and the back fillet weld 11 are not required, and as a result, the number of work steps for welding, finishing, and distortion removal can be reduced.

  In the structural examples shown in FIGS. 9 and 10, the hydroformed product 14 is press-formed in a D-shaped cross section having no step portions at both ends in the height direction. Since the vertical cross-sectional height dimension (substantially D-shaped height dimension) H1 of the hydraulic-molded product 14 and the height dimension H2 of the end portions 8a and 8a of the bracket 8 are substantially the same dimension, After the end portion 8a of the bracket 8 is butted against the side surface of the pipe steel pipe (hydraulic molded product 14) having a D-shaped cross section, these butted portions are connected to the straight weld 10 and the transverse beam pipe steel pipe circumferential weld 12 (in this example, circumferential welding is also performed). It becomes a linear welding). Compared with the structural examples shown in FIGS. 7 and 8, the bead width of the linear weld 10 can be made narrower, and the man-hour can be reduced. However, depending on the strength calculation result, it is considered necessary to construct the back fillet weld 11 if necessary. The structure example shown in FIG. 12 shows a more specific image than the structure example shown in FIG. 9, but the structure becomes simple in this way, and is an effective means in terms of both workability and quality.

  In each of the above examples, the present invention has been particularly described as a railcar bogie frame and a manufacturing method thereof. However, the present invention is not limited to the horizontal beam structure forming the bogie frame as described above, but a joint portion such as a jumper beam and a side beam. It can also be applied to. Further, it can be recognized as a bogie frame having such a structure (both bogie frames as shown in FIG. 2), or a bogie having such a bogie frame (both as shown in FIG. 1).

1: Bogie frame 2: Wheel 3: Side beam 4: Cross beam 5: Horizontal beam pipe steel pipe 6a: Spring beam 6b: Brake receiver 6c: Main motor receiver 6d: Gear box suspension receiver 7: Welding wire 8: Bracket for gear box suspension receiver 9: Bracket end hem welding 10: Straight line welding 11: Back fillet welding 12: Cross beam pipe steel pipe circumferential welding 13, 14: Hydroformed product 15: Flat overhang 16: Corner overhang

Claims (8)

A pair of side beams extending along the longitudinal direction of the carriage, and a transverse beam made of a pipe steel pipe extending in the width direction of the carriage between the side beams and joined to the side beam, constitute the transverse beam. In the bogie frame for a railway vehicle in which the end surface joined to the pipe steel pipe supports the bogie-related parts via a substantially rectangular bracket,
A part of the pipe steel pipe is overhanged to form an overhanging portion having a substantially rectangular end surface with which the end surface of the bracket is fitted, and the end of the bracket is joined to the overhanging portion. Bogie frame. In the bogie frame for railway vehicles according to claim 1,
The overhang portion is
The pipe steel pipe has a D-shaped cross section that is stretched on the pipe,
A flat overhanging portion extending tangentially from the circular cross-section of the pipe steel pipe;
On both sides of the flat overhanging portion, a corner overhanging portion connecting the cylindrical surface of the pipe steel pipe,
A bogie frame for a railway vehicle characterized by comprising: In the bogie frame for railway vehicles according to claim 2,
A stepped portion is formed on the flat overhanging portion,
The bogie frame for a railway vehicle, wherein the stepped portion is joined to the end portion of the bracket in a fitted state . In the bogie frame for railway vehicles according to claim 2,
The bogie frame for a railway vehicle, wherein the bracket is joined to the flat overhanging portion in a state of being attached to a tip corner portion of the flat overhanging portion. A railcar carriage frame according to any one of claims 1 to 4 ,
A railcar bogie characterized in that the side beam rotatably supports a wheel shaft and supports a vehicle structure mounted thereon via a spring means such as an air spring. In the bogie for railway vehicles according to claim 5 ,
The transverse beam has a main motor for driving a railway vehicle, a gear box with a built-in gear mechanism that transmits rotation between the output shaft and the wheel shaft of the main motor, and a braking force that acts on the brake when braking the railway vehicle. A bogie for a rail vehicle characterized by supporting the bogie-related parts to be received. A pair of side beams extending along the longitudinal direction of the carriage, and a transverse beam made of a pipe steel pipe extending in the width direction of the carriage between the side beams and joined to the side beams by welding. In the manufacturing method of a bogie frame for a railway vehicle in which an end surface joined to the pipe steel pipe constituting the hoist supports a bogie-related part via a substantially rectangular bracket,
After projecting a part of the pipe steel pipe that constitutes the transverse beam, after forming a projecting portion of a substantially rectangular end surface to which the end surface of the bracket is fitted,
Joining the end of the bracket to the overhang,
The manufacturing method of the bogie frame for rail vehicles characterized by these. In the manufacturing method of the bogie frame for rail vehicles according to claim 7 ,
The overhang portion is formed using a hydraulic press method in which a hydraulic pressure is applied to the inside of the pipe steel pipe, and a part of the pipe steel pipe is deformed by being pressed against the inner surface of a mold disposed outside. A method for manufacturing a bogie frame for a rail vehicle.

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