Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Diffusion connection method of cylinder wall structure

A diffusion connection and cylinder wall technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of increasing the difficulty of tooling and welding process uncertainty, and achieve the elimination of process instability, uniform stress, and improved uniformity effect on sex and product quality

Inactive Publication Date: 2018-02-09
SHANGHAI SPACE PRECISION MACHINERY RES INST
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems such as the difficulty of tooling and the uncertainty of the welding process due to the uniform pressure perpendicular to the axial direction applied from the inside when brazing or diffusion welding is used for the welding of the above-mentioned cylindrical wall-shaped double-layer structure, the present invention provides a Diffusion connection method of cylindrical wall structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Diffusion connection method of cylinder wall structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The invention discloses a diffusion connection method of a cylindrical wall structure, and the inner and outer structural materials are all copper alloys. The difference between the inner diameter of the outer wall and the outer diameter of the inner wall of the wall-shaped structure is 0.02%. The inner wall is placed in liquid nitrogen for 20 minutes and then quickly loaded into the outer wall. After assembly, the workpiece is subjected to high-temperature diffusion welding. The welding temperature is higher than the design temperature. Lower the temperature by 4°C and reduce the holding time by 4 minutes.

Embodiment 2

[0019] The invention discloses a diffusion connection method of a tapered cylinder wall structure, and the inner and outer structural materials are copper alloy and aluminum alloy. Fix the intermediate layer with a thickness of 0.1 mm on the corresponding position on the outer surface of the inner cylinder wall by spot welding, and the difference between the inner diameter of the outer cylinder wall and the outer diameter of the inner cylinder wall of the cylinder wall structure is 0.05%, such as figure 1 As shown, the inner cylinder wall is placed in liquid nitrogen for 24 minutes and then quickly loaded into the outer cylinder wall, and the buckles are fixed on the upper and lower sides to prevent the inner and outer cylinders from slipping. After assembly, the workpieces are subjected to high-temperature diffusion welding. The holding time is reduced by 9 minutes.

Embodiment 3

[0021] The invention discloses a diffusion connection method of a trapezoidal cylinder wall structure, and the inner and outer structural materials are stainless steel and aluminum alloy. The middle layer with a thickness of 0.15mm is fixed on the corresponding position on the outside of the inner cylinder wall by spot welding. The difference between the inner diameter of the outer cylinder wall and the outer diameter of the inner cylinder wall of the cylinder wall structure is 0.10%, and the inner cylinder wall is in liquid nitrogen. After placing it for 26 minutes, quickly put it into the wall of the outer cylinder, and fix the buckles on the upper and lower sides to prevent the inner and outer cylinders from slipping. After assembly, the workpieces are subjected to high-temperature diffusion welding. The welding temperature is 30°C lower than the design temperature, and the holding time is reduced by 15 minutes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a diffusion connection method of a cylinder wall structure. The diffusion connection method comprises the following steps of putting an inner cylinder wall in liquid nitrogen for 20-30 min and then rapidly mounting the inner cylinder wall into an outer cylinder wall to form a combined workpiece; conducting high-temperature diffusion welding on the combined workpiece and realizing diffusion connection of inner and outer cylinder wall structures through required diffusion welding pressure generated by deformation and interference installation of the workpiece at high temperature, wherein the inner diameter of the outer cylinder wall of the cylinder wall structure is 0.02-0.2% greater than the outer diameter of the inner cylinder wall; the temperature and time requiredfor diffusion connection are determined by the inner and outer cylinder diameter difference; the welding temperature can be reduced by 2-5 DEG C and the temperature holding time can be reduced by 1-2min every 0.01% increase in the outer diameter difference. By means of the diffusion connection method, the structure and process are simplified, and the uniformity and product quality of the weldingsurface can be improved; the diffusion connection method is applicable to welding conditions of columnar, conical, trapezoidal cylindrical and various cylinder wall structures.

Description

technical field [0001] The invention relates to a diffusion connection method of a cylindrical wall-shaped metal structure, which belongs to the technical field of welding and thermoforming. Background technique [0002] The double-walled cylindrical wall structure with grooves, such as cabins with liquid cooling systems, engine thrust chambers, valve seats, etc., work in high temperature, high pressure, and large heat flow environments, and the structural reliability requirements are extremely high. Diffusion welding is often used for the inner and outer layers. connect. Diffusion welding is an advanced solid-phase connection technology, which can connect internal multi-point and large-area components, and realize connections that cannot be realized by fusion welding methods, especially suitable for welding of cylindrical wall-shaped dissimilar materials. Welding temperature, pressure and holding time are the main parameters of the diffusion welding process, and the pressu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/24
CPCB23K20/023B23K20/24
Inventor 陈旭彭赫力刘海建杨旭东李中权何光荣袁勇张小龙
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com