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A high-performance fastener spring, its manufacturing method and application

A high-performance, elastic bar technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problem of low fatigue life of elastic bars, achieve the effect of increased raw material costs, good promotion and application prospects, high strength, toughness, and high cycle fatigue performance

Active Publication Date: 2020-11-10
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, fatigue fracture is the main failure mode of elastic bars, and the fatigue life of elastic bars is often low under complex stress states

Method used

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  • A high-performance fastener spring, its manufacturing method and application
  • A high-performance fastener spring, its manufacturing method and application
  • A high-performance fastener spring, its manufacturing method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A raw material wire for fastener clips, the mass percent of its chemical composition is: C=0.58%, Si=1.73%, Mn=0.88%, Cr=0.27%, Pfigure 1 As shown, the preparation method of the high-performance fastener elastic strip comprises the steps:

[0078] 1) Thermoforming of spring raw material wire:

[0079] The raw material wire (diameter 20mm) with the above chemical composition was heated to 1050°C, kept for 0.3h, and then the soaked wire was bent and formed into an "e-shaped" spring bar, and the forming temperature was 850°C.

[0080] 2) Quenching and tempering treatment of spring bars:

[0081] Quench and cool the hot-formed elastic bars at a cooling rate of about 80°C / s to the quenching temperature (QT) of 140°C, the temperature before quenching is 850°C, and the quenching and holding time is 2 minutes; then, temper the quenched elastic bars For treatment, heat the quenched elastic strip at a heating rate of about 35°C / s to the tempering temperature (TT) of 410°C, and h...

Embodiment 2

[0089] A raw material wire for fastener clips, the mass percent of its chemical composition is: C=0.48%, Si=1.2%, Mn=1.5%, Nb=0.2%, P figure 2 As shown, the preparation method of the high-performance fastener elastic strip comprises the steps:

[0090] 1) Thermoforming of spring raw material wire:

[0091] The raw material wire (diameter 20mm) with the above chemical composition was heated to 1050°C, kept for 0.3h, and then the soaked wire was bent and formed into an "e-shaped" spring bar, and the forming temperature was 850°C.

[0092] 2) Quenching and tempering treatment of spring bars:

[0093] Quench and cool the hot-formed elastic bars at a cooling rate of about 80°C / s to the quenching temperature (QT) of 100°C, the temperature before quenching is 850°C, and the quenching and holding time is 2 minutes; then, implement two-stage cooling on the quenched elastic bars For tempering treatment, first heat the quenched elastic strip at a heating rate of about 35°C / s to the temp...

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Abstract

The invention relates to a high-performance rail fastener elastic strip and a manufacturing method and an application thereof. The microstructure of the fastener elastic strip is mainly mixture of martensite and retained austenite or mixture of martensite, bainite and retained austenite, wherein the volume fraction of the retained austenite is between 3% and 20%, in addition, the microstructure ofthe elastic strip can further contain precipitated carbide with the volume fraction not larger than 1%. The manufacturing method of the novel high-performance fastener elastic strip comprises steps of thermal forming of an elastic strip raw material wire, quenching and tempering treatment of the elastic strip and aftertreatment of the elastic strip, hardness of the novel high-performance fastenerelastic strip is larger than or equal to 44 HRC, the section shrinkage rate is larger than or equal to 25%, the room-temperature impact absorption energy KV2 is larger than or equal to 10 J, the total decarburization layer depth of the elastic strip is smaller than or equal to 0.2 mm, and the elastic strip has the excellent high-cycle fatigue resistance characteristic. The fastener elastic stripis applied to the field of rail transit and is an important component of a rail fastener system.

Description

technical field [0001] The invention belongs to the technical field of rail fastener systems for rail transit, and in particular relates to a high-performance fastener clip and its manufacturing method and application. Background technique [0002] The rail fastener system is the link between the rail and the structure below the rail. Its main function is to fix the position of the rail, prevent the longitudinal / lateral displacement of the rail, prevent the rail from tilting and rollover, reduce vibration and noise, and ensure the stability of the entire rail system. Sex and reliability are paramount. As the main component of the rail fastening system, the elastic buckle (that is, the elastic) has the characteristics of large linear change and good elastic performance. Its quality and performance directly affect the driving safety of the entire track line. [0003] From the application point of view, elastic bars not only need to have certain stiffness and elasticity, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/28C22C38/26C22C38/24C22C38/22C22C38/32C22C38/38C22C38/34C21D1/18C21D7/06C21D9/02
CPCC21D1/18C21D7/06C21D9/02C21D2211/001C21D2211/002C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38
Inventor 郝庆国杨旗刘艳徐斌
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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