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Process for prefabricating cold-drawn plate for side wall large plate of passenger train

A technology for cold-drawn prefabricated panels and railway passenger cars, which is applied in railway car bodies, railway car body parts, railway transportation, etc., can solve the problem of difficulty in reaching the leveling level, low flatness of side wall panels, and uneven internal stress of large panels. and other problems to achieve the effect of saving investment, saving production materials and man-hours, and shortening the production cycle

Inactive Publication Date: 2003-03-12
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the above-mentioned manufacturing process of the side wall panel of the car, the flatness of the side wall panel is not high, and it needs to be rectified in the subsequent process. Usually, it is flattened by fire or electromagnetic. As a result, the large protrusions are turned into many small pieces. It is difficult to achieve the ideal flat level, the fundamental reason is that the internal stress of the large plate is not uniform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Cut the steel plate (06CuPCrNi) into a 25-meter-long large coil. After uncoiling, put one end of the large plate into the mold of the fixing mechanism, and introduce the other end into the mold of the stretching mechanism. position. Adjust the pressure of the fixing mechanism system to 18Mpa and press the large plate tightly to make the large plate rectangular and then maintain the pressure for 1 minute; start the stretching mechanism, stretch the large plate to 200-270mm, stop stretching and hold the pressure for 2 minutes, and stretch the plate The straightness of the straightness is not greater than 2mm within 25m, and the deflection is not greater than 3mm; return the large plate to eliminate the elastic deformation of the large plate (generally around 50mm); loosen the fixing mechanism and the stretching mechanism respectively, so that the large plate is separated from the mold and Move to the side wall welding tire position for welding.

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Abstract

A cold draw process for prefabricating the big side wall plate of railway carriage includes cold drawing the big plate in longitudinal direction by 0.9-1.2% of elongation percentage to generate permanent plastic deformation, and welding two drawn big plates together. Its advantages are simple process, short period, high utilization rate of raw material, and not cracking.

Description

Technical field: [0001] The invention discloses a cold-drawn prefabricated panel process for a large-area side wall panel of a railway passenger car, and belongs to the technical field of manufacturing technology for a large-area side wall panel of a carriage. Background technique: [0002] At present, the known manufacturing methods of the side wall panels of railway passenger cars include the following methods: After the large panels are unrolled, they are cut into small panels with a width of about 1000 mm and a length of about 2400 mm, and after pretreatment, they are welded into 25-meter panels. A large plate with a length of 2.4 meters and a width of 2.4 meters is placed flat on the side wall welding fixture, stretched by 15 to 29 mm, and welded. After the welding is completed, the fixture is released, and the steel plate recovers to 20 mm of elastic deformation, ensuring that the length of the steel plate does not change. Change. Or divide the large plate of the requ...

Claims

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Application Information

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IPC IPC(8): B61D17/04B61D17/08
CPCY02T30/34Y02T30/00
Inventor 王勇孙乐天孙双进韩凤武许春晖刘斌胡清寒
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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