JP4234696B2 - Railcar head structure - Google Patents

Description

  The present invention relates to a railcar head structure, and more particularly to a railcar head structure in which a plurality of frame blocks formed in a predetermined shape are welded together to form a framework of a railcar head structure.

In recent years, the number of railway vehicles in which the outer plate shape of the leading portion is configured with a complex curved surface has been rapidly increasing due to a reduction in air resistance during high speed traveling and design reasons. The head structure for a railway vehicle having such a curved shape is a frame block formed in advance in a predetermined shape on a skeleton block formed by welding the intersection of a circumferential member and a longitudinal bone member manually. The plate is manually welded to form a structure block, and these outer end surfaces are brought into contact with each other and welded manually. Further, a cutting allowance is provided on the outer plate side of each bone member, and each frame block is corrected to the product shape by correcting the outer plate side of the frame block before welding the outer plate. (For example, refer to Patent Document 1).
JP 2005-22508 A

  In general, since each bone member is formed by fusion bonding such as arc welding, deformation due to thermal strain occurs in the joint portion between the bone members and each bone member due to heat during welding. For this reason, conventionally, the cutting allowance provided on the outer plate side of each bone member is corrected so that the deformation generated in the skeleton block does not affect the outer plate.

  However, if the deformation due to thermal distortion during welding reaches the outer end surfaces of the skeleton blocks, a gap may be generated between the outer end surfaces when the skeleton blocks are brought into contact with each other and welded. Such a gap is often filled with a weld bead during welding, which not only increases the number of manufacturing steps and increases the number of manufacturing steps, but also tends to cause local thermal distortion. May decrease and deteriorate the appearance of the vehicle.

  Therefore, the present invention can be performed with high accuracy by suppressing the occurrence of local thermal distortion and deformation at the time of joining the skeleton blocks, and can be used to manufacture a railcar top portion having a good appearance. It is intended to provide a head structure.

In order to achieve the above-described object, the head structure for a railway vehicle according to the present invention includes a plurality of skeleton blocks formed by welding intersections of a plurality of circumferential bone members and a plurality of longitudinal bone members. In the railroad vehicle head portion structure that forms the framework of the railcar head portion structure by welding the outer end surfaces of each other, the circumferential bone member and the longitudinal bone member are formed on the outer end surface of the frame block. A cutting allowance for correcting distortion generated during welding is projected, and the cutting allowance is removed to correct the distortion, and the outer end surfaces of the respective skeleton blocks are butted together and welded. Yes.

  According to the top structure for a railway vehicle of the present invention, the outer end surfaces of the skeleton blocks are made to have a predetermined shape by correcting the cutting allowance provided on the outer end surfaces before welding the outer end surfaces of the skeleton blocks. Can be matched without gaps. Thereby, the joining precision of frame blocks can be improved and the head part for rail vehicles with a favorable external appearance can be manufactured. In addition, since work such as filling a gap during welding is not necessary, workability during welding is improved and the number of manufacturing steps can be reduced.

  FIG. 1 is a perspective view showing an example of the shape of a skeleton block, FIG. 2 is a perspective view showing a state in which the outer end surfaces of adjacent skeleton blocks are butted against each other, and FIG. FIG. 4 is a perspective view showing an example of a railway vehicle head part structure, and FIG. 5 is a perspective view showing an example of division of the rail car head part structure.

  First, as shown in FIG. 4 and FIG. 5, the head part structure 11 for a railway vehicle shown in the present embodiment joins the upper structure blocks 12 and 13 and the side structure blocks 14 and 15 that are divided into four in the longitudinal direction of the vehicle body. The top cover 17 is joined to the bonnet block 16 formed as described above.

  As shown in FIG. 1, each structure block is obtained by joining an outer plate 25 to a skeleton block 24 in which intersecting portions 23 of a plurality of circumferential bone members 21 and a plurality of longitudinal bone members 22 are welded. The outer end surface of each of the bone members 21a and 22a located on the outer peripheral portion of the skeleton block 24 is for correcting distortion generated by heat when the circumferential bone member 21 and the longitudinal bone member 22 are welded. A machining allowance 26 is provided.

  The machining allowance 26 is obtained by projecting the outer peripheral portion of each bone member 21a, 22a, and the projection amount is estimated from conditions such as the length and shape of each bone member, the combination state of each bone member, and the welding position. Although it is set in accordance with the maximum amount of thermal strain to be applied, if the protrusion amount is too large, it takes time for cutting, so usually about several mm, for example, about 2 to 8 mm is appropriate. Further, the cutting allowance 26 can be formed so as to project the entire outer surface of the bone members 21a and 22a, but only the joining side of the outer plate 25 where deformation due to thermal distortion appears prominently in the product structure is projected. You may do it.

  In the head part structure 11, first, each frame block 24 is assembled into a predetermined shape by welding the intersecting portions 23 in a state where the bone members 21 and 22 are held at predetermined positions by a jig or the like, and the completed frame block 24 is completed. Each structure block as shown in FIG. 1 is formed by welding the outer plate 25 which has been previously formed into a predetermined shape on the outer surface side of each. Then, as shown in FIG. 2, each structure block, for example, the upper structure block 12 and the side structure block 14 arranged adjacent to each other are arranged at predetermined positions, and the outer end surfaces of the skeleton block 24 and the edge of the outer plate 25 are arranged. It is manufactured by joining each other.

  Then, when joining the outer end surfaces of the skeleton blocks 24, as shown in FIG. 3, the cutting allowances 26 protruding from the outer surfaces of the bone members 22a constituting the outer ends of both skeleton blocks 24 are removed. Then, the outer end surfaces of both frame blocks 24 are corrected to a predetermined shape, and then both outer end surfaces are brought into contact with each other and welded. Thereby, since a gap is not generated between the outer end surfaces, the welding operation can be performed smoothly and reliably, and the joining accuracy between the skeleton blocks 24 can be improved. In addition, since the work of filling the gap with the weld bead is eliminated, the number of manufacturing steps can be reduced and the occurrence of local thermal distortion can be suppressed.

  Further, a cutting allowance 27 is provided on the outer surface side of each of the bone members 21 and 22, and before the outer plate 25 is joined, the cutting allowance 27 is removed to correct the outer surface side of the frame block 24. The plate 25 can be more reliably joined, and the leading structure 11 having a good appearance without deformation or distortion can be manufactured.

  In the above description, the procedure for joining the frame blocks 24 and the outer plates 25 after joining the outer plate 25 to the frame block 24 to form the structure block is given as an example. After forming the frame corresponding to the head structure 11, the outer plate formed outside the frame can be joined regardless of the bonding position of the frame block 24.

  In addition, arc welding is generally used for joining each member, but an appropriate joining method can be employed according to the material of each member and the state of the joint, for example, laser welding, electron beam welding. Such as melt bonding, FSW (friction stir welding), brazing, etc. can be adopted, but in any bonding method, each member is heated at the time of bonding. Occurrence is inevitable.

  Further, since structures other than the head structure 11, such as roof structures and side structures, are formed in a predetermined shape by machining, when the head structure 11 is joined to a base frame, a roof structure, etc. By cutting away the cutting allowance 26 provided at the outer end surface portion to be joined with each other, it is possible to join these and the head structure 11 reliably and without deformation or distortion.

It is a perspective view which shows one shape example of a frame block. It is a perspective view which shows the state which faces | matches and welds the outer end surfaces of an adjacent frame block. It is explanatory drawing at the time of abutting the outer end surfaces of a frame block. It is a perspective view which shows an example of the head part structure for rail vehicles. It is a perspective view which shows the example of a division | segmentation of the head part structure for rail vehicles.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Head part structure for rail vehicles, 12, 13 ... Upper structure block, 14, 15 ... Side part structure block, 16 ... Bonnet block, 17 ... Head part cover, 21 ... Circumferential bone member, 22 ... Longitudinal bone member , 23 ... intersection, 24 ... frame block, 25 ... outer plate, 26, 27 ... shaving allowance

Claims (1)

A plurality of skeleton blocks formed by welding the intersections of a plurality of circumferential bone members and a plurality of longitudinal bone members are welded with the outer end surfaces of each skeleton block abutted to each other to be welded. In the head part structure for a railway vehicle that forms the framework of the above, a cutting allowance for correcting distortion generated during welding of the circumferential bone member and the longitudinal bone member is provided on the outer end surface of the framework block. The head structure for a railway vehicle , wherein the cutting allowance is removed to correct the distortion, and the outer end surfaces of the skeleton blocks are butted against each other and welded .

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