A rail transit box girder frame welding process and its lean production layout method

Abstract

The invention discloses a rail transit box girder frame welding process and its lean production layout method. The process specifically includes three sub-processes: a side beam welding process, a beam welding process and a frame welding process; wherein the side beam welding process and the beam welding process There is no time sequence between the processes. After the side beam welding process and the beam welding process are completed, the frame welding process is carried out. The welding process adopts the combination of manual spot fixing and mechanical welding. A straightening adjustment is carried out before the small accessories are fixed to control the deformation after welding, which can improve the welding efficiency and quality. In terms of the layout method of lean production, the three core parts of the automatic welding area, the manual assembly area and the three-dimensional warehouse with double stackers are arranged in the center of the automatic welding area or the center of the three-dimensional warehouse, and then cooperate with the surrounding process area, which can be greatly improved. Increase productivity.

Description

technical field [0001] The invention relates to the technical field of manufacturing welding processes and corresponding production process layout methods, in particular to a welding process of a box girder frame in the rail transit industry and a corresponding lean production layout method. Background technique [0002] The box girder frame is an important bearing structure for rail transit vehicles, and its welding quality is directly related to the reliability and safety of the vehicle. combined with figure 1 , the box girder frame of the rail transit vehicle in the prior art is composed of a left beam assembly 001, a right beam assembly 002 and a cross beam assembly 003. The three major assemblies each include multiple welding processes, and at the same time, the assemblies must pass through The traditional welding process is all manual welding, but with the rapid progress of the current intelligent manufacturing technology, the rail transit industry is gradually promot...

AI Technical Summary

Problems solved by technology

[0004] 1. After the box girder frame and its side beam components are welded by the traditional process, the deformation and warpage are relatively large, and the size of the small accessory group will be out of tolerance when welding, which cannot meet the quality requirements. Therefore, the general frame will be adjusted and repaired after welding. Machining (machining datum plane) is performed on the outside, and the small accessories will also be properly machined, and then the small accessories and the frame will be paired and welded. The process is lengthy and complicated

[0005] 2. After the welding of the box girder frame and its components is completed, due to the large deformation and warpage, it needs to be repaired as a whole. Because the overall structural rigidity of the components after welding is large, the repair requires a large repair pressure, and generally needs to be repaired by heating After water cooling, it is difficult to adjust and repair

[0006] To sum up, there is currently a lack of a rail transit box girder frame welding process with higher automation procedures, more streamlined procedures, better welding quality, and easier maintenance.

[0007] At the same time, the inventor of this patent application also found that the current production lines established based on the traditional rail transit box girder frame welding process mostly use manual welding or automatic welding single stations for the box girder frame and components as the dominant planning layout, and the application of lean production ideas There are still some deficiencies, including: (1) The production line materials are mainly lifted and delivered by hand, and the distribution is not refined enough; (2) The setting of process positions is unreasonable, the shortest path is not reached, and there are too many worthless time; (3) The lineside materials of the production line are not close to hand, and employees need to walk around repeatedly to pick up materials, which is a serious waste of manpower

[0008] That is to say, at the same time, there is still a lack of a production line layout method with more refined material distribution, more contracted job settings, higher production efficiency, and higher lean procedures.

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