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

Quasi-flow-state rapid forming method for martensitic steel complicated tubular structure

A martensitic steel and complex tube technology, applied in the field of advanced manufacturing of complex metal structural parts, can solve the problems of low technical and device requirements, low forming efficiency, etc. High security effect

Active Publication Date: 2018-01-26
NANJING INST OF TECH
View PDF6 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, an integral forming method of a super-large duplex stainless steel tee (CN201710124639.4) also proposes the use of quasi-fluid media to assist the forming of a super-large special-shaped tee, but the forming object is ordinary stainless steel, and the forming efficiency is low. Low, and does not involve technical problems such as rapid forming and rapid quenching of martensitic steel, and does not have high requirements for technology and equipment

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
  • Quasi-flow-state rapid forming method for martensitic steel complicated tubular structure
  • Quasi-flow-state rapid forming method for martensitic steel complicated tubular structure
  • Quasi-flow-state rapid forming method for martensitic steel complicated tubular structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: with reference to attached figure 1 , 2 , 3, a quasi-fluid rapid prototyping method and device for a martensitic steel complex tubular structure, comprising the following steps:

[0036] 1) Cutting: Select a square-edged 22MnB5 uncoated ultra-high-strength steel tube blank with an outer diameter of 20mm and a wall thickness of 3mm, and cut the tube blank to an axial length of 75mm;

[0037]2) Austenitization: Place the cut tube blank in a resistance furnace and heat it to 920°C as a whole, and then keep it warm for two minutes; during the heating process, segmental heating is used, and the heating temperature of each section is 320°C, 610°C, 920°C respectively. ℃, the pipe needs to be rotated 90° before each section is heated into the furnace to ensure that it is evenly heated; the heating temperature is monitored by the temperature monitoring device 8;

[0038] The advantages of adopting segmental heating in the present invention are: the heating speed ...

Embodiment 2

[0045] Embodiment 2: with reference to attached figure 1 , 2 , 4, a quasi-fluid rapid prototyping method and device for a martensitic steel complex tubular structure, comprising the following steps:

[0046] 1) Cutting: Select a four-edged 30MnB5 uncoated ultra-high-strength steel tube blank with an outer diameter of 12mm and a wall thickness of 2mm, and cut the tube blank to an axial length of 60mm;

[0047] 2) Austenitization: Place the cut tube blank in a resistance furnace and heat it to 930°C as a whole, and then keep it warm for two minutes; during the heating process, segmental heating is used, and the heating temperature of each section is 330°C, 620°C, 930°C ℃, the pipe should be rotated 90° before each section is heated into the furnace to ensure that it is evenly heated;

[0048] 3) Quasi-fluid forming: After heating, use the mechanical arm to quickly put the tube blank into the forming mold, and after clamping the punches at both ends, use AZB300 quasi-fluid cera...

Embodiment 3

[0052] Embodiment 3: with reference to attached figure 1 , 2 , Shown in 5, a quasi-fluid rapid prototyping method and device for a martensitic steel complex tubular structure, comprising the following steps:

[0053] 1) Cutting: Select a cylindrical 30CrMnSiA ultra-high-strength steel tube blank with an outer diameter of 20mm and a wall thickness of 2mm with Al-Si coating, and cut the tube blank to an axial length of 70mm;

[0054] 2) Austenitization: place the cut tube blank in a resistance furnace and heat it to 950°C as a whole, and then keep it warm for two minutes; during the heating process, segmental heating is used, and the heating temperature of each section is 350°C, 640°C, 950°C respectively. ℃, the pipe should be rotated 90° before each section is heated into the furnace to ensure that it is evenly heated;

[0055] 3) Quasi-fluid forming: After heating, use the mechanical arm to quickly put the tube blank into the forming mold, and after clamping the punches at b...

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
Outer diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Outer diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a quasi-flow-state rapid forming method and device for a martensitic steel complicated tubular structure, and belongs to the technical field of advanced manufacturing of metalcomplicated structures. The quasi-flow-state rapid forming method for the martensitic steel complicated tubular structure comprises the following steps: heating a tube until complete austenitizing isimplemented, then rapidly transferring the tube into a die, and carrying out die closing; after die closing is finished, rapidly filling a tube blank with a ceramic quasi-flow-state medium, and then pushing a propelling punch to enable a part, which is not subjected to die closing, of the tube to swell after filling is finished; and after complete die closing is finished, filling the tube with cooling water, and adjusting flow speed to enable a structure to be converted into martensite completely. After a forming process is finished, a final structure is obtained by operations such as cutting,punching and shot blasting. The quasi-flow-state medium is used for swelling of an inner wall, huge risks caused by gas swelling can be reduced, and the fatigue life is prolonged; and moreover, in the forming process, the thinning ratio of a tube wall is reduced, and the forming precision of the tube is high. The quasi-flow-state rapid forming method has good adaptability for forming of a key tubular structure of special equipment, and has high engineering application value.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing of metal complex structural parts, and in particular relates to high-performance and rapid manufacturing of ultra-high-strength steel complex tubular structural parts. Background technique [0002] Under the background of structural weight reduction and light weight, the fields of aviation, automobile and rail transit have put forward higher requirements for the structural design and performance of materials. On the one hand, the material is required to have higher specific strength and specific stiffness; on the other hand, it is required to realize the integrated forming of complex shapes to meet the requirements of functional design and further reduce the weight of the structure. Martensitic steel is a kind of ultra-high-strength steel based on martensitic structure, and its tensile strength can reach 1400MPa. It is a high-performance structural material that has attracted much a...

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
IPC IPC(8): B21C37/15B21D26/033B21D26/041C21D8/10C21D1/18C21D9/08
Inventor 李华冠费炜杰毛麒童王章忠张保森巴志新
Owner NANJING INST OF TECH
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