CN110480266B - Manufacturing method of vehicle traction beam, vehicle traction beam and railway vehicle - Google Patents
Manufacturing method of vehicle traction beam, vehicle traction beam and railway vehicle Download PDFInfo
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- CN110480266B CN110480266B CN201910764460.4A CN201910764460A CN110480266B CN 110480266 B CN110480266 B CN 110480266B CN 201910764460 A CN201910764460 A CN 201910764460A CN 110480266 B CN110480266 B CN 110480266B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/50—Other automobile vehicle parts, i.e. manufactured in assembly lines
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Abstract
The invention provides a manufacturing method of a vehicle traction beam, the vehicle traction beam and a railway vehicle. The manufacturing method of the vehicle traction beam comprises the following steps of forming two traction beam webs by a single section; the web plate of the traction beam and the lower cover plate are spliced to form a V-shaped groove and are butt welded to form a vehicle traction beam main body; after the vehicle traction beam main body is butted with the coupler mounting seat, a Y-shaped groove is formed and butt welded; and a curved surface mounting plate is welded between the mounting seat of the anti-climbing energy-absorbing device and the mounting seat of the car coupler. According to the manufacturing method of the vehicle traction beam and the vehicle traction beam, two traction beam webs are formed by using a single section, so that the processing efficiency is improved; forming a V-shaped groove at the splicing position of the traction beam web and the lower cover plate; the Y-shaped groove is formed at the splicing position of the vehicle traction beam and the coupler mounting seat, so that the welding operation difficulty is reduced, and the welding quality is ensured; and a curved surface mounting plate is welded between the anti-climbing energy absorption device mounting seat and the coupler mounting seat, so that enough clearance is reserved for the passing of the coupler in a curve.
Description
Technical Field
The invention relates to the technical field of vehicle traction beams, in particular to a manufacturing method of a vehicle traction beam, the vehicle traction beam and a railway vehicle.
Background
The traction beam structure type of the domestic aluminum alloy subway head car is more, and the defects of the following aspects are mainly existed by analyzing the connection mode, the general structure of the traction beam, the welding method, the anti-climbing (energy absorption) and the like:
1. connection mode of coupler mounting base and draft sill
A hot riveting structure is adopted between the coupler mounting seat and the traction beam web, the coupler mounting seat is made of low alloy steel, meanwhile, the rivet is also made of low alloy material, and the mass of the rivet is far larger than that of an aluminum profile under the same volume; the weight of the structure is too heavy to satisfy the light weight requirement!
2. Single-piece draft sill structure
(1) The traction beam structure is formed by splicing and welding plates with different thicknesses in an inserting mode, and the plates in the structure are complicated in positioning, high in fixing difficulty and poor in assembling precision;
(2) the part adopts a sectional material tailor-welding structure, the car coupler mounting seat and the single-piece traction beam adopt T-shaped fillet welding, the welding amount is large, the positioning and clamping difficulty is large, and the flatness after welding is poor;
3. single-piece traction beam welding mode
In the aspect of welding, the traditional manual electric arc welding is adopted for welding the traction beam, and the welding quality is greatly influenced by instability of welding skills of operators in the welding process. In addition, the welding amount, the welding wire consumption and the heat input amount are large during welding, and the flatness after welding is poor, so that time and labor are wasted in adjustment and repair;
4. installation of anti-creeping and energy-absorbing device
The energy-absorbing anti-climbing energy-absorbing device at the front end of the primary car traction beam is directly arranged on the mounting plate, and uncontrollable deformation is generated due to welding of the mounting plate and the car coupler mounting seat, so that the anti-climbing energy-absorbing device cannot be guaranteed to be in the same plane after being arranged, the front end of the anti-climbing energy-absorbing device is stressed unevenly, and impact energy is influenced to be dissipated quickly.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a manufacturing method of a vehicle traction beam, the vehicle traction beam and a railway vehicle, and aims to solve the problems that in the prior art, the manufacturing method of the traction beam is complex and the machining precision is low.
(II) technical scheme
In order to solve the technical problems, the invention provides a manufacturing method of a vehicle traction beam, the vehicle traction beam and a railway vehicle. The manufacturing method of the vehicle traction beam comprises the following steps: forming two traction beam webs through a single section; the traction beam web plate and the lower cover plate are spliced to form a V-shaped groove and are butt welded to form a vehicle traction beam main body; after the vehicle traction beam main body is butted with the coupler mounting seat, a Y-shaped groove is formed and butt welded; and a curved surface mounting plate is welded between the mounting seat of the anti-climbing energy-absorbing device and the coupler mounting seat.
Further, the manufacturing method further includes: and designing the single section into a cubic box type closed structure, and cutting the single section into two traction beam webs by adopting an oblique symmetry segmentation method.
Further, the manufacturing method further includes: and processing HV grooves on the traction beam web and the lower cover plate respectively, wherein the HV grooves are formed by the HV grooves on the traction beam web and the HV grooves on the lower cover plate.
Further, the manufacturing method further includes: and a reinforcing wing surface is arranged on the outer side surface of the lower cover plate.
Further, the manufacturing method further includes: and a backing plate is arranged on the back of the V-shaped groove.
Further, the manufacturing method further includes: the vehicle traction beam main body is provided with an inserting port corresponding to the coupler mounting seat, an HY groove is formed on the upper surface of the inserting port, and a step surface is formed on the lower surface of the inserting port.
Further, the manufacturing method further includes: and processing an HY type groove on the installation position of the coupler installation seat corresponding to the upper surface of the interface, wherein the Y type groove is formed by the HY type groove on the upper surface of the interface and the HY type groove on the coupler installation seat.
Further, the lower cover plate is processed by a section bar and is molded by pressing; the coupler mounting seat is formed by pressurizing and processing sectional materials; the butt welding adopts automatic welding, and plug welding and fillet welding are adopted between the mounting seat of the anti-creep energy-absorbing device and the curved surface mounting plate.
According to another aspect of the present invention, there is provided a vehicle draft sill including an under sill cover, the vehicle draft sill being made by the method of manufacturing the vehicle draft sill according to any one of the preceding claims; a traction beam supplement plate is arranged on the outer side edge of the lower cover plate; the vehicle traction beam further comprises a curved surface mounting plate, and two ends of the curved surface mounting plate are respectively connected with the coupler mounting seat and the anti-creep energy-absorbing device mounting seat.
According to another aspect of the invention, the invention provides a railway vehicle, which comprises a buffer beam, a vehicle traction beam and a sleeper beam, wherein the buffer beam and the sleeper beam are respectively connected to two ends of the vehicle traction beam, and the vehicle traction beam is the vehicle traction beam.
(III) advantageous effects
According to the manufacturing method of the vehicle traction beam, the vehicle traction beam and the rail vehicle, the two traction beam webs are formed by using the single section, so that the section sections of the traction beam webs are uniform, the die opening number is reduced, the die opening cost is low, and the utilization rate of the section is improved; a V-shaped groove is formed at the splicing position of the traction beam web and the lower cover plate, so that the root gap of the traction beam web and the lower cover plate can be used for adjusting the vertical size of the integral box-type structure of the traction beam web, and the risk caused by welding deformation is reduced; a Y-shaped groove is formed at the splicing position of the vehicle traction beam and the coupler mounting seat, so that the welding operation difficulty is reduced, and the welding quality is ensured; the curved surface mounting plate is welded between the anti-climbing energy absorption device mounting seat and the coupler mounting seat, so that the coupler is enabled to leave enough clearance in a curve, interference with the curved surface mounting plate is prevented under the condition that the swing angle of the coupler is large, the force transmitted to the curved surface mounting plate is reduced through force decomposition of a car body under a compression working condition, and the static strength and the fatigue strength of the curved surface mounting plate are improved. Therefore, the manufacturing process difficulty of the vehicle traction beam is reduced, and the machining precision can be ensured.
Drawings
FIG. 1 is a schematic perspective view of an angle of a vehicle draft sill provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic perspective view of another angle of a vehicle draft sill provided in accordance with an embodiment of the present invention;
FIG. 3 is an enlarged schematic illustration of the coupling mount and draft sill interface provided by an embodiment of the present invention;
FIG. 4 is a schematic perspective view of a coupler mount provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic side view of a vehicle draft sill provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view taken in the direction A-A of FIG. 5;
FIG. 7 is an enlarged view of a portion of FIG. 6 at B;
fig. 8 is a partial enlarged view at C in fig. 6.
The reference numbers illustrate:
1. a trailing beam web; 2. a lower cover plate; 3. a coupler mounting seat; 4. an anti-creep energy-absorbing device mounting base; 5. a curved surface mounting plate; 6. reinforcing the airfoil; 7. a base plate; 9. a stopper beam; 10. a rib plate in the cavity; 11. and (4) enclosing plates.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1 to 8 in combination, a method of manufacturing a vehicle draft sill includes the steps of: forming two traction beam webs 1 by a single section; the web plate 1 of the traction beam and the lower cover plate 2 are spliced to form a V-shaped groove and are butt welded to form a vehicle traction beam main body; after the vehicle traction beam main body is butted with the coupler mounting seat 3, a Y-shaped groove is formed and butt welded; and a curved surface mounting plate 5 is welded between the anti-climbing energy-absorbing device mounting seat 4 and the coupler mounting seat 3.
According to the manufacturing method of the vehicle traction beam and the vehicle traction beam, the two traction beam webs 1 are formed by using a single section, so that the section sections of the traction beam webs 1 are uniform, the die opening quantity is reduced, the die opening cost is low, and the utilization rate of the section is improved; a V-shaped groove is formed at the splicing position of the traction beam web 1 and the lower cover plate 2, so that the root gap of the two can be used for adjusting the vertical size of the integral box-type structure of the traction beam web 1, and the risk brought by welding deformation is reduced; a Y-shaped groove is formed at the splicing position of the vehicle traction beam and the coupler mounting seat 3, so that the welding operation difficulty is reduced, and the welding quality is ensured; the curved surface mounting plate 5 is welded between the anti-climbing energy absorption device mounting seat 4 and the coupler mounting seat 3, so that the coupler is enabled to leave enough clearance in a curve, interference with the curved surface mounting plate 5 is prevented under the condition that the swing angle of the coupler is large, the force transmitted to the curved surface mounting plate 5 is reduced through force decomposition under the compression working condition of a car body, and meanwhile, the static strength and the fatigue strength of the curved surface mounting plate 5 are also improved. Therefore, the manufacturing process difficulty of the vehicle traction beam is reduced, and the machining precision can be ensured.
Specifically, referring to fig. 1 and 2, the overall structure of the draft sill is divided by a coupler mounting seat 3, the front half of the coupler mounting seat 3 is called a front end of the draft sill, and the rear half is called a rear end of the draft sill; the front end of the traction beam mainly comprises a stop beam 9, a curved surface mounting plate 5, an inner cavity rib plate 10, an anti-climbing energy absorption device mounting seat 4, a vertical plate, a coaming 11 and the like; the rear end of the draft sill mainly comprises a car coupler mounting seat 3, a draft sill web 1, a lower cover plate 2, a draft sill patch panel, a crotch inner rib plate and the like.
The traction beam web plate 1 is processed by a sectional material, specifically, a single sectional material is designed into a cubic box type closed structure, and the single sectional material is cut into two traction beam web plates 1 by adopting an oblique symmetry division method.
Firstly, the section bar for manufacturing the towing beam web plate 1 is designed into a cubic box type closed structure, one section bar is divided into two equal-volume halves by adopting an oblique symmetry dividing method, and the molding of the two towing beam web plates 1 is realized by one section bar. The lower cover plate 2 is directly manufactured by processing section bars and compression molding.
Secondly, processing HV type grooves at the butted positions of the traction beam web 1 and the lower cover plate 2 respectively; the welding joint form of the V-shaped groove is formed through assembly, and conditions are created for subsequent automatic welding. The butt joint positions of the traction beam web 1 and the lower cover plate 2 are set to be in a V-shaped groove joint mode, and the purpose is that the control requirement on the welding angle in the V-shaped groove welding process is low.
In this embodiment, the assembly process of the two is as follows:
as shown in fig. 6, assembling a processed traction beam web 1 and a processed and molded lower cover plate 2, merging HV grooves carried by the traction beam web and the processed and molded lower cover plate to finally form a V-shaped groove, wherein the gap width of the V-shaped groove meets 0-3mm according to the requirement of the gap between the roots of the two HV grooves; and 3mm of clearance adjustment is allowed, and errors caused by extrusion, machining and die pressing of the traction beam section are adjusted through the clearance. Meanwhile, the adjustment amount can adjust the flatness of the upper plane of the traction beam. The tolerance requirement of profile processing and die pressing is only 2mm, so the error caused by the process manufacturing process can be completely overcome by the adjustment amount of 0-3 mm.
Wherein, the traction beam web 1 and the lower cover plate 2 are fixed by adopting an automatic welding mode. The advantages of automatic welding are mainly shown in the following aspects: the influence of human factors on the welding quality is reduced; the heat input is uniform in the welding process, the deformation after welding is small, the structure is uniformly stressed, and the structure strength is improved; automatic welding replaces manual operation, and labor cost is saved.
Further, in order to restrict the degree of freedom of the lower cover plate 2 and ensure that the lower cover plate 2 and the towing beam web 1 do not move relatively in the automatic welding process, a reinforcing wing surface 6 meeting the requirement of automatic welding is designed on the outer side surface of the lower cover plate 2.
Still further, in order to guarantee welding quality, increase backing plate 7 at the V type groove back, its effect is mainly as follows: the welding seam can be completely penetrated, so that the requirement of penetration depth is met, and the welding quality is guaranteed; prevent the welding defects such as welding penetration, overburning and the like.
Thereby, the manufacture of the vehicle draft sill body is completed.
After the manufacture of the vehicle draft sill body is completed, the vehicle draft sill body needs to be butted against the coupler mounting seat 3.
In the butt joint process, firstly, it is required to ensure that an interface corresponding to the coupler mounting seat 3 is arranged on the vehicle draft sill main body, an HY type groove is formed on the upper surface of the interface, and an HY type groove is processed on the coupler mounting seat 3 and the mounting position corresponding to the upper surface of the interface, so that the HY type groove on the upper surface of the interface and the HY type groove on the coupler mounting seat 3 form a Y type groove.
A step surface is formed on the lower surface of the socket, that is, in this embodiment, the plugging form of the coupler mounting base 3 and the socket on the vehicle draft sill main body is: the upper surface of the socket is convenient for welding the socket and the socket through a Y-shaped groove. The lower surface of the plug interface enables the plug interface and the car coupler mounting seat to be mutually plugged through the step surface, a reference is provided for mounting the car coupler mounting seat 3 and the car draft sill main body, the assembly difficulty is greatly reduced, and the assembly precision is improved.
In this embodiment, since the sockets are all machined, the machining, welding and forming accuracy can be greatly improved, and the overall assembly of the vehicle draft sill main body and the coupler mounting seat 3 is finally realized.
As shown in fig. 1 to 3, when the coupler mounting seat 3 is assembled with the curved mounting plate 5, the curved mounting plate 5 forms a certain angle with the coupler mounting seat 3, which can play the following roles: enough space is reserved for the car coupler to pass through a curve, and the car coupler is prevented from interfering with the curved surface mounting plate 5 under the condition of larger swing angle of the car coupler; under the compression working condition, the vehicle body reduces the force transmitted to the curved surface mounting plate 5 through the force decomposition; the static strength and the fatigue strength of the curved surface mounting plate 5 are improved.
Further, as shown in fig. 1 and fig. 2, the anti-creep energy-absorbing device in this embodiment employs a separate mounting seat. The anti-climbing energy absorption device is arranged to ensure the flatness of the mounting surface of the anti-climbing energy absorption device. And the mounting seat 4 of the anti-creep energy-absorbing device is welded with the curved surface mounting plate 5 through plug welding and fillet welding. Integrally processing a mounting seat of the anti-creep energy-absorbing device by taking the lower plane of the sleeper beam as a reference plane, and ensuring that the flatness of the mounting seat 4 of the anti-creep energy-absorbing device is within 0.2 mm; the requirements that the front end faces of the anti-creep energy-absorbing devices are on the same plane are met, and the problem of installation deviation of the anti-creep energy-absorbing devices is solved.
Example two
According to another aspect of the present invention, the present invention provides a vehicle draft sill, including a lower cover plate 2, the vehicle draft sill being manufactured by the manufacturing method of the vehicle draft sill in the first embodiment; and the outer edge of the lower cover plate 2 is provided with a towing beam patch. The overall structural strength of the lower cover plate 2 can be improved by arranging the traction beam patch, and the overall structural strength of the vehicle traction beam can be further improved.
Furthermore, the vehicle traction beam also comprises a curved surface mounting plate 5, and two ends of the curved surface mounting plate 5 are respectively connected with the coupler mounting seat 3 and the anti-climbing energy-absorbing device mounting seat 4.
3 fixed connection of coupling mount pad is on the draw beam, and when coupling mount pad 3 and anti-creep energy-absorbing device mount pad 4 and curved surface mounting panel 5 assembled, curved surface mounting panel 5 formed certain angle with coupling mount pad 3, and it can play following effect: enough clearance is reserved for the car coupler when the car coupler passes through a curve, and the car coupler is prevented from interfering with the curved surface mounting plate 5 under the condition that the swing angle of the car coupler is large; under the compression working condition, the vehicle body reduces the force transmitted to the curved surface mounting plate 5 through the force decomposition; the static strength and the fatigue strength of the curved surface mounting plate 5 are improved.
EXAMPLE III
According to another aspect of the invention, the invention provides a railway vehicle, which comprises a buffer beam, a vehicle traction beam and a sleeper beam, wherein the buffer beam and the sleeper beam are respectively connected to two ends of the vehicle traction beam, and the vehicle traction beam is the vehicle traction beam in the second embodiment.
Other structures of the rail vehicle can refer to the prior art, and are not described in detail herein. Due to the technical effects of the vehicle traction beam, the rail vehicle comprising the vehicle traction beam also has corresponding technical effects, and the detailed description is omitted.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of manufacturing a vehicle draft sill, comprising the steps of:
forming two traction beam webs (1) through a single section;
the traction beam web plate (1) and the lower cover plate (2) are spliced to form a V-shaped groove and are butt welded to form a vehicle traction beam main body;
a vehicle traction beam main body is butted with a coupler mounting seat (3) to form a Y-shaped groove and butt welded;
and a curved surface mounting plate (5) is welded between the anti-climbing energy-absorbing device mounting seat (4) and the car coupler mounting seat (3).
2. The method of manufacturing a vehicle draft sill according to claim 1, further comprising: the single section is designed into a cubic box type closed structure, and the single section is cut into two traction beam webs (1) by adopting an oblique symmetry division method.
3. The manufacturing method of a vehicle draft sill according to claim 2, further comprising: and (2) processing HV grooves on the traction beam web (1) and the lower cover plate (2) respectively, wherein the HV grooves are formed by the HV grooves on the traction beam web (1) and the HV grooves on the lower cover plate (2).
4. The method of manufacturing a vehicle draft sill according to claim 1, further comprising: and a reinforcing wing surface (6) is arranged on the outer side surface of the lower cover plate (2).
5. The manufacturing method of a vehicle draft sill according to claim 2, further comprising: and a backing plate (7) is arranged on the back surface of the V-shaped groove.
6. The method of manufacturing a vehicle draft sill according to claim 1, further comprising: an inserting port corresponding to the coupler mounting seat (3) is formed in the vehicle traction beam main body, an HY groove is formed in the upper surface of the inserting port, and a step surface is formed in the lower surface of the inserting port.
7. The method of manufacturing a vehicle draft sill according to claim 6, further comprising: and processing an HY type groove on the installation position of the coupler installation seat (3) corresponding to the upper surface of the interface, wherein the Y type groove is formed by the HY type groove on the upper surface of the interface and the HY type groove on the coupler installation seat (3).
8. The method for manufacturing a vehicle draw beam according to any one of claims 1 to 7, wherein the lower cover plate (2) is formed by profile machining, compression molding; the coupler mounting seat (3) is formed by pressurizing and processing sectional materials; the butt welding adopts automatic welding, and plug welding and fillet welding are adopted between the mounting seat (4) of the anti-creep energy-absorbing device and the curved surface mounting plate (5).
9. A vehicle trailing beam comprising a lower deck (2), characterized in that it is made by the method of manufacturing a vehicle trailing beam according to any one of claims 1 to 8;
the outer edge of the lower cover plate (2) is provided with a traction beam patch plate;
the vehicle traction beam further comprises a curved surface mounting plate (5), and two ends of the curved surface mounting plate (5) are connected with the coupler mounting seat (3) and the anti-climbing energy absorption device mounting seat (4) respectively.
10. A railway vehicle comprising a bumper beam, a vehicle traction beam and a bolster, said bumper beam and said bolster being attached to each end of said vehicle traction beam, wherein said vehicle traction beam is according to claim 9.
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| CN201910764460.4A CN110480266B (en) | 2019-08-19 | 2019-08-19 | Manufacturing method of vehicle traction beam, vehicle traction beam and railway vehicle |
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| CN201910764460.4A CN110480266B (en) | 2019-08-19 | 2019-08-19 | Manufacturing method of vehicle traction beam, vehicle traction beam and railway vehicle |
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| CN110480266B true CN110480266B (en) | 2020-07-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111229847A (en) * | 2020-01-19 | 2020-06-05 | 中车青岛四方机车车辆股份有限公司 | Profile for machining a trailing beam and method for machining a trailing beam |
| CN111688747A (en) * | 2020-06-12 | 2020-09-22 | 中车长春轨道客车股份有限公司 | Freight transportation EMUs end chassis structure |
| CN112937624B (en) * | 2021-03-30 | 2022-10-14 | 北京轨道交通技术装备集团有限公司 | Underframe traction and bolster buffering structure |
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| CN103625501A (en) * | 2013-10-17 | 2014-03-12 | 南车青岛四方机车车辆股份有限公司 | Railway vehicle anti-creeping buffering structure |
| DE202014100013U1 (en) * | 2014-01-02 | 2014-01-29 | Weka Fahrzeugbau Gmbh | Floor construction of a commercial vehicle |
| CN104625343A (en) * | 2014-12-26 | 2015-05-20 | 辽宁忠旺集团有限公司 | Drafting and buffering welding technology for aluminum alloy subway body |
| CN105312764A (en) * | 2015-11-30 | 2016-02-10 | 长春轨道客车股份有限公司 | Manufacturing process of ends of aluminum alloy underframe of standard motor train unit |
| CN106964901A (en) * | 2017-04-11 | 2017-07-21 | 中车青岛四方机车车辆股份有限公司 | Complex welding method, draw beam and the rail vehicle with the draw beam of draw beam |
| CN108313084A (en) * | 2018-04-11 | 2018-07-24 | 中车长春轨道客车股份有限公司 | A kind of underframe of subway structure meeting Unite States Standard requirement |
| CN208630610U (en) * | 2018-08-01 | 2019-03-22 | 中车青岛四方机车车辆股份有限公司 | A kind of draw beam |
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