Method for improving fatigue life of swing arm structure

A technology of fatigue life and boom, which is applied in the field of boom structure evaluation and detection, can solve the problems of increased production cost and increased production time, and achieve the effect of improving fatigue life and avoiding damage

Inactive Publication Date: 2019-01-04
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
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Problems solved by technology

However, the current processing method does not meet the two principles of precision and accuracy, but blindly processes the entire weld seam. The time required

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  • Method for improving fatigue life of swing arm structure
  • Method for improving fatigue life of swing arm structure
  • Method for improving fatigue life of swing arm structure

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Embodiment Construction

[0027] In the following, the method for improving the fatigue life of the boom structure of the present invention will be described in more detail in conjunction with the schematic diagram, which shows the preferred embodiment of the present invention. It should be understood that those skilled in the art can modify the present invention described here and still realize the present invention. The advantageous effect of the invention. Therefore, the following description should be understood to be widely known to those skilled in the art, and not as a limitation to the present invention.

[0028] In this embodiment, take a certain model of boom welding as an example, such as figure 1 The boom structure shown is composed of a boom plate 1, a cross beam 2, a supporting plate and a rib plate welded together. The analysis shows that the welding seam between the boom and the beam 2 shows residual tensile stress in the welding seam after welding.

[0029] Such as figure 2 As shown, a me...

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Abstract

The invention provides a method for improving the fatigue life of a swing arm structure. The method is achieved by processing the residual stress of a local weld seam. The method comprises the following steps of obtaining a stress distribution map of the weld seam and determining a local dangerous position of the weld seam under a corresponding dangerous working condition according to a stress value, a step of obtaining a welding residual stress distribution map at a local dangerous position under the corresponding dangerous working condition, and a step of estimating the influence of weldingresidual stress at the local dangerous position on a fatigue intensity, determining a processing method of the welding residual stress and process parameters according to the welding residual stress,and processing the local dangerous position. According to the method, by determining a local dangerous position with the largest residual stress of the weld seam and processing the local dangerous position, the fatigue life of the swing arm structure is accurately improved.

Description

Technical field [0001] The invention relates to the field of assessment and detection of boom structures, in particular to a method for improving the fatigue life of a boom structure. Background technique [0002] Boom is an important part of construction machinery, it is connected with frame, rocker arm, cylinder and shovel (digging) bucket. Generally, it is welded by two boom plates, a support plate and an elliptical cylindrical beam. It is the key support and main force-bearing structure in the working device of construction machinery. In addition to bearing a large static working load during the working process, it must Withstand a certain impact load. The welding seam of the boom structure is affected by the welding process as a relatively easy part to crack. There are two methods for solving this problem in the prior art: one is to enhance the strength design of the weld from a design perspective; the other is to increase the strength of the weld through treatment after t...

Claims

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Application Information

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IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 卢曦侯文亮孙子莹陆永能
Owner UNIV OF SHANGHAI FOR SCI & TECH
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