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

Movable flash welding and heat treatment technology for 60kg/mU75V+U75VG steel rail

A rail and process technology, applied in the field of 60kg/mU75V+U75VG rail mobile flash welding and heat treatment technology, can solve the problems of non-compliance and unsatisfaction in the drop weight inspection of joints, and achieve the effects of less internal defects, improved quality and good stability

Active Publication Date: 2018-01-09
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
View PDF2 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the 60kg / m U75VG high-speed railway 100-meter steel rail produced by the production plant according to the standard of TB / T3276-2011 "Rails for High-speed Railways" is not easy to control due to short rulers, rolling scars, inclusions or straightness during the production process. Meet TB / T3276~2011 high-speed rail standards
Moreover, in the prior art, when welding U75V+U75VG rails, the drop weight inspection of the joints is always unacceptable due to reasons such as the size of the gray spots on the rail bottom exceeds the standard.

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
  • Movable flash welding and heat treatment technology for 60kg/mU75V+U75VG steel rail
  • Movable flash welding and heat treatment technology for 60kg/mU75V+U75VG steel rail
  • Movable flash welding and heat treatment technology for 60kg/mU75V+U75VG steel rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] When the U75V+U75VG rail is welded by a mobile rail flash welding machine, the welding heat input in the first stage of flash flattening is 1.7MJ, the rail consumption is 0.4mm, and the duration is 19.9s. The welding heat input in the second stage of pulsation is 6.0MJ, the rail consumption is 3.8mm, and the duration is 63.9s. In the third stage of accelerated sintering, the welding heat input is 0.4MJ, the rail consumption is 7.4mm, and the duration is 17.1s. The welding heat input of the fourth stage of upsetting is 0.10MJ, the amount of upsetting is 16.2mm, the time of live upsetting is 0.4s, and the duration is 8.8s. The holding pressure of the fifth stage of holding pressure is 27.9T, and the duration is 13.2s. Control the total welding heat input to 8.2MJ, the total rail consumption to 27.8mm and the total welding duration to 113s to achieve the purpose of controlling the welding quality.

[0025] When the joint temperature after upsetting and pushing is natural...

Embodiment 2

[0027] When the U75V+U75VG rail is welded by a mobile rail flash welding machine, the welding heat input in the first stage of flash flattening is 1.6MJ, the rail consumption is 1.5mm, and the duration is 19.9s. The welding heat input in the second stage of pulsation is 6.2MJ, the rail consumption is 6.2mm, and the duration is 64s. In the third stage of accelerated sintering, the welding heat input is 0.3MJ, the rail consumption is 8.0mm, and the duration is 17.1s. The welding heat input of the fourth stage of upsetting is 0.10MJ, the upsetting amount is 16.4mm, the live upsetting time is 0.4s, and the duration is 6.8s. The holding pressure of the fifth stage of holding pressure is 27.9T, and the duration is 13.2s. Control the total welding heat input to 8.2MJ, the total rail consumption to 32.1mm and the total welding duration to 113s to achieve the purpose of controlling the welding quality.

[0028] When the joint temperature after upsetting and pushing is naturally coole...

Embodiment 3

[0030]When the U75V+U75VG rail is welded by a mobile rail flash welding machine, the welding heat input in the first stage of flash flattening is 1.6MJ, the rail consumption is 0.6mm, and the duration is 19.9s. The welding heat input in the second stage of pulsation is 6.0MJ, the rail consumption is 6.8mm, and the duration is 63.9s. In the third stage of accelerated sintering, the welding heat input is 0.3MJ, the rail consumption is 7.6mm, and the duration is 16.3s. The welding heat input of the fourth stage of upsetting is 0.10MJ, the upsetting amount is 16.4mm, the live upsetting time is 0.4s, and the duration is 7.4s. The holding pressure of the fifth stage of holding pressure is 27.0T, and the duration is 13.2s. Control the total welding heat input to 8.1MJ, the total rail consumption to 31.4mm and the total welding duration to 113s to achieve the purpose of controlling the welding quality.

[0031] When the joint temperature after upsetting and pushing is naturally cool...

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

No PUM Login to View More

Abstract

The invention discloses a movable flash welding and heat treatment technology for a 60kg / mU75V+U75VG steel rail, in particular to a movable flash welding and heat treatment technology for a 60kg / mU75V+U75VG steel rail in the technical field of steel rail welding. The movable flash welding and heat treatment technology for the 60kg / mU75V+U75VG steel rail comprises a flash flattening stage, a pulsation stage, an accelerated incineration stage, an upsetting stage and a pressure maintaining stage. In the welding process, the total welding heat input is 8.2MJ-8.7MJ, the total welding duration timeis 111s-121s, and the welding upsetting length is 16.0mm-16.6mm. By the adoption of the method, the 60kg / mU75V+U75VG steel rail can be successfully subjected to movable flash welding, few internal defects are produced inside a steel rail connector, welding quality is stable, and the steel rail connector can pass various mechanical property tests such as a fatigue test, a tensile test and a staticbending test; and the steel rail connector can continuously pass the test of 15 flash welding connector drop hammers, and has good stability.

Description

technical field [0001] The invention relates to a 60kg / m U75V+U75VG rail moving flash welding and heat treatment process, in particular to a 60kg / m U75V+U75VG rail moving flash welding and heat treatment process in the field of rail welding technology. Background technique [0002] With the increasingly stringent requirements for heavy loads of railways in various countries, the axle load of railways continues to increase, requiring steel rails to have stronger wear resistance, that is, higher hardness requirements. In the prior art, the welding of 60kg / m U75V+U75VG rail mainly includes the flash flat stage, pulsation stage, accelerated burning stage, upsetting stage and pressure holding stage. Therefore, how to select welding control parameters, how to select and coordinate the control range of each parameter is the key issue for 60kg / m U75V+U75VG rail. In the prior art, the 60kg / m U75VG high-speed railway 100-meter steel rail produced by the production plant according to ...

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): B23K11/04C21D9/50B23P15/00
Inventor 王若愚李大东白威邓健
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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