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Heat treatment process of austempered ductile iron bushing

A technology for Aube ductile iron and bushings, which is applied in the field of heat treatment of Aubeite ductile iron bushes, can solve the problems of serious rolling vibration, hidden dangers of driving safety, and increased failure rate, and achieve small lateral swing and high fatigue resistance The effect of resistance and low wear

Inactive Publication Date: 2013-09-04
南京雷尔伟新技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, especially after the speed of the railway vehicle is increased, due to the more serious wear of the bushing, various types of bogie vehicles have problems such as large vertical vibration, serious roll vibration, serious wear, and increased failure rate. There is a great danger

Method used

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  • Heat treatment process of austempered ductile iron bushing
  • Heat treatment process of austempered ductile iron bushing
  • Heat treatment process of austempered ductile iron bushing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put the cast bushing into a box-type resistance furnace and heat it to 850°C, keep it warm for 1 hour, then immediately quench the heated bushing into a nitrate furnace at 250°C, keep it warm for 1 hour, and then take it out of the furnace and cool it with water for 5 minutes. Complete the heat treatment process. After the tensile test, the tensile strength is 1530Mpa, the elongation is 0.8%, and the impact energy is 36J.

Embodiment 2

[0023] Put the cast bushing into a box-type resistance furnace and heat it to 950°C, keep it warm for 1 hour, then immediately quench the heated bushing into a nitrate furnace at 300°C, keep it warm for 1 hour, and then take it out of the furnace and cool it with water for 5 minutes. Complete the heat treatment process. After the tensile test, the tensile strength is 1350Mpa, the elongation is 3%, and the impact energy is 40J.

Embodiment 3

[0025] Put the cast bushing into a box-type resistance furnace and heat it to 900°C, keep it warm for 1 hour, then immediately quench the heated bushing into a nitrate furnace at 275°C, keep it warm for 1 hour, and then take it out of the furnace and cool it with water for 5 minutes. Complete the heat treatment process. After the tensile test, the tensile strength is 1412Mpa, the elongation is 2%, and the impact energy is 30J.

[0026] The Aube ductile iron bushing of the present invention has achieved the following performance characteristics:

[0027] 1. After casting, the spheroidization level is 1-4 in GB9441-88;

[0028] 2. After casting, the size of graphite shall be grade 5 not thicker than GB94441-88;

[0029] 3. The hardness is HRC40-48;

[0030] 4. Radial crush strength ≥ 2000N / mm 2 ;

[0031] 5. Mechanical properties: tensile strength σ b ≥1200Mpa, elongation δ≥1%, unnotched impact energy (-40°C) α k ≥35J;

[0032] The Aube ductile iron bushing of the presen...

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Abstract

The invention discloses a heat treatment process of an austempered ductile iron bushing. The heat treatment process of the austempered ductile iron bushing is characterized by comprising the following steps of: 1, casting a bushing by nodular cast iron and machining; 2, heating the bushing to a temperature of 850-950 DEG C in a chamber electric furnace, preserving the heat for 1h; 3, immediately quenching the heated bushing in a nitrate furnace with a temperature of 250-300 DEG C, preserving the heat for 1h; and 4, discharging out of the furnace and cooling with water for about 5min. According to the heat treatment process of the austempered ductile iron bushing, provided by the invention, the manufactured austempered ductile iron bushing has the characteristics of high strength, high hardness, good impaction, high wear resistance and fatigue resistance, and small abrasion; moreover, a matching gap of a pin and the bushing is well controlled, the vibration and noise during running are remarkably smaller than those of other vehicles, and the normal position of a bogie is ensured due to slight lateral oscillation; and the austempered ductile iron bushing is high in radiance and good in corrosion resistance, and has no rhegma during use and overhauling processes.

Description

technical field [0001] The invention relates to a heat treatment process for an Aube ductile iron bushing, and belongs to the technical field of heat treatment processes. Background technique [0002] The railway plays an important role in the current national economy. Because of its safety, convenience and speed, the train has been chosen by travelers more often. Therefore, higher requirements are put forward for the comfort and safety of trains. The bushing of the train bogie is a vulnerable part with a large amount of wear, and the quality of the product directly affects the safety of the vehicle. Most of the bushes used on the old-type bogies are steel bushes, which adopt the surface quenching heat treatment method to meet the performance requirements of surface hardness HRC45-50. When these parts are in service, they are squeezed and chiseled with their counterparts. Wear and tear, the working conditions are very harsh and the wear is serious. Therefore, especially a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/14C21D5/00C21D1/20
Inventor 丁鑫张健彬
Owner 南京雷尔伟新技术股份有限公司
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