Assembly and welding method of concave chassis
A welding method and the technology of concave bottom frame, which are applied in the field of assembly and welding of concave bottom frame, can solve the problems of unfavorable large-scale popularization and application, heat input deformation of the overall structure, and high requirements for one-time investment, so as to facilitate the promotion and application of the industry and production Improve efficiency and optimize the effect of plate welding process
Active Publication Date: 2022-04-26
CRRC ZHUZHOU ROLLING CO LTD
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Problems solved by technology
However, the load-bearing beam itself involves a large number of welding operations after the overall structure is formed, and it is easy to cause heat input deformation to the overall structure. It is difficult to correct it by the methods mentioned in the prior art. Production site process equipment is difficult to complete
If large-scale tooling equipment is invested, the one-time investment requirements for actual production are very high, and when the subsequent site changes, the required tooling maintenance costs are high, which is not conducive to large-scale promotion and application
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[0029] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments. Apparently, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] Such as figure 1 As shown, the concave bottom frame 1 includes a load beam 2, arms at both ends 3 and two disc beams 4, and the main body of the load beam 2 is composed of an upper cover plate 5, a lower cover plate 6, a web 7, a partition plate 8 and a rib plate 9 groups are welded into a box-type fully enclosed structure. The assembly and welding method of the concave chassis 1 includes the steps of adopting the "flip-chip method" for asse...
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The invention provides a method for assembling and welding a concave bottom frame, which includes the following steps: prefabricating the upper cover plate with a downward deflection value, and performing consistent downward deflection treatment before the web is blanked; assembling the partition, web and ribs The plate is fixed by welding after clamping and positioning; the lower cover plate is assembled and welded and fixed; the deflection and flatness of the load beam are corrected by flame adjustment method; The lower plane is used as the reference, and the end arms at both ends are adjusted for positioning and fixed by spot welding, and finally the center beam is adjusted for positioning and fixed by welding. The invention effectively controls the assembly accuracy of the concave bottom frame, solves the problem of abnormal upward convexity after welding of the load-bearing beam, and improves the finished quality of the concave bottom frame. The production efficiency of large-scale tire molds is significantly improved, and it is suitable for single-piece small-batch production, which is conducive to industry promotion and application.
Description
technical field [0001] The invention relates to the technical field of railway concave bottom flat cars, in particular to a method for assembling and welding a concave bottom frame. Background technique [0002] The steel structure of the D15B concave bottom flat car includes a concave bottom frame and two small bottom frames. Among them, the concave underframe is composed of a load-bearing beam, arms at both ends and two center plate beams. The main material is Q345qE structural steel for bridges that conforms to GB / T714, and has good weldability. The main body of the load-bearing beam is welded into a box-shaped fully enclosed structure by upper cover plate, lower cover plate, web plate and partition plate, such as figure 1 shown. [0003] The assembly and welding method of the load-carrying beam in the prior art includes prefabricating the lower deflection of the upper cover plate and the web in the material preparation process, and assembling and welding according to a...
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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 宾树平韦焕军罗柏成刘成艺刘艺
Owner CRRC ZHUZHOU ROLLING CO LTD