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Preparation method of high-strength small hole for component connection

A high-strength, component-based technology, applied in welding equipment, laser welding equipment, manufacturing tools, etc., can solve problems such as difficulty in hard mandrels, and achieve high-strength effects

Active Publication Date: 2021-11-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the depth and diameter of through-holes in thin plates are small, and it is difficult for the hard mandrel used in conventional hole extrusion technology to pass through the hole structure without damaging the hole structure.

Method used

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  • Preparation method of high-strength small hole for component connection
  • Preparation method of high-strength small hole for component connection

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] As introduced in the background technology, the present invention provides a preparation method of high-strength small holes for component connection, which specifically includes the following steps:

[0028] 1. Determine the shape and size of the hole structure to be processed

[0029] The shape of the high-strength small hole in the present invention is circular, and its diameter and other dimensions are determined by technicians according to actual processing requirements.

[0030] 2. Determine the shape and size of the pulsed laser beam

[0031] This step is based on the premise that the parameters of the pulsed laser beam have been determined, that is, the parameters of the pulsed laser, such as laser energy, laser wavelength, and laser pulse width, have been combined with the actual laser shock practice experience by the technicians and based on information such as the mechanical properties of the material to be processed. And ok.

[0032] In the double-beam hig...

Embodiment 1

[0044] Take the example of forming a circular hole with a diameter of 2mm on a 304-type austenitic stainless steel plate with a thickness of 2mm. Determine the parameters of the pulsed laser beam as laser energy 5J, laser wavelength 1064nm, laser pulse width 18ns, determine the diameter of the pulsed laser beam as 5mm according to the diameter of the proposed small hole; determine the parameters of the continuous laser beam as laser energy density 10 6 W / cm 2, The laser wavelength is 1064nm, and the laser pulse width is 1ms. Since the smoothness of the to-be-formed circular small hole wall is relatively high, the surface roughness is lower than 100μm. The diameter of the continuous laser beam is determined to be 1.6mm to ensure the processing of the to-be-formed small hole. quantity. Using the pulsed laser beam to carry out double-sided laser shock surface strengthening treatment on the planned hole area of ​​the stainless steel sheet, in the process of processing, ensure tha...

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PUM

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Abstract

The invention belongs to the technical field of hole structure processing and strengthening, and relates to a preparation method of a high-strength small hole for component connection. The preparation method comprises the following steps: carrying out surface impact strengthening treatment on a hole preparation area of a to-be-processed material by adopting a pulse laser beam, so that the hole preparation area on the surface of the to-be-processed material can be subjected to macroscopic plastic deformation; and carrying out hole drilling at the central position of a pulse laser beam irradiation area by adopting the continuous laser beam, so that a hole structure can be formed. According to the preparation method, the strengthening treatment of the hole structure is completed before the hole preparation procedure; the defect that a hole structure formed through a simple laser drilling method is low in strength and prone to failure is overcome; meanwhile, the unfavorable residual stress hole phenomenon is reasonably utilized; and under the condition of the more obvious residual stress hole phenomenon, the residual pressure stress field distribution strength of the prepared hole structure is higher.

Description

technical field [0001] The invention belongs to the technical field of pore structure processing and strengthening, and in particular relates to a preparation method of high-strength small holes used for component connection. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Fasteners are a type of mechanical parts used for fastening connections. During the connection process, through holes are often used to complete riveting and other connections. In mechanical devices, the pore structure often becomes a prone area for fatigue failure due to the existence of the stress concentration effect. In current industrial applications, technicians often extrude and strengthen the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/382B23K26/60C21D10/00
CPCB23K26/382B23K26/60C21D10/005
Inventor 卢国鑫王强罗学昆季忠王佃刚王欣赵国群
Owner SHANDONG UNIV