Structure for rolling stock

Abstract

The present invention provides a framework for rail vehicle, which comprises a side framework. Furthermore the side framework is provided with an outer plate and a third reinforcing component which is connected with the inner side of outer plate and is used for reinforcing the outer plate, wherein the third reinforcing component is jointed on the outer plate through laser welding. The framework for vehicle according to the invention causes that the outer plate will not easily curved through setting the distance of the third reinforcing component. For example, the surface internal stress component generated in the outer plate is decomposed to uniaxial stresses sigmax and sigmay in the length direction of vehicle body and in the direction perpendicular with the length direction of vehicle body and shear stress tau. The distance of reinforcing component defined by the welding line of laser welding is set to cause that these stresses is below the curve pressure value determined by the formula of Euler curve and plasticity modified formula. The framework for rail vehicle according to the invention has better tolerance and better aesthetic property.

Description

[0001] The application number is 200580015809.0 (international application number is PCT / JP2005 / 007076), the application date is April 12, 2005, and the title of the invention is "Laser welding method, laser welding joint, outer plate panel and framework for railway vehicles" The divisional application of the invention patent application. technical field [0002] The present invention relates to a frame for a railway vehicle. It is especially suitable for unpainted frames for railway vehicles or the bodies of buses, trucks, etc. Background technique [0003] Conventionally, as frames for railway vehicles, in addition to stainless steel members (frames for railway vehicles made of stainless steel), Figure 45 The light stainless steel member 201 shown in (a) (outer plate + frame + outer plate reinforcement member) and Figure 45 In addition to the double-piece stainless steel frame 202 (outer plate+integral press-molded inner plate) shown in (b), a double-shell type stainless...

AI Technical Summary

Problems solved by technology

[0034] In this regard, it is also possible to adjust the laser output and perform welding so that the welding marks do not occur. However, in the case of, for example, the thickness of the lower plate is 1.5 mm and the thickness of the upper plate is 1 mm, the width of the weld bead at the joint interface is 0.3 mm to 0.5 mm. The penetration depth of the plate is 0.1mm to 0.2mm. In the case of such a penetration depth, it cannot be joined at all under the influence of some kind of disturbance.

Conversely, if a convex weld mark occurs, the joint can be reliably formed, and it is difficult to ensure both joint quality and appearance quality

[0035] In addition, when the thickness of the lower plate is 3 mm or more, it can be confirmed that the outer plate is hardly affected even if a sufficient penetration depth is ensured, but the thickness of the lower plate increases more than necessary, resulting in a significant increase in the weight of the structural member, this is not ideal

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