Isothermal quenching nodular cast iron roller for push-pull vehicle on heat treatment production line and production method thereof

A technology of austempering and ductile iron, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problem of wear rate affecting equipment reliability, etc., and achieve the effect of small notch sensitivity, stable operation of parts, and good shock absorption.

Active Publication Date: 2014-06-04
上海宝华威热处理设备有限公司
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Problems solved by technology

The traditional multi-purpose furnace has increased from 600 kg per furnace to 5000 kg per furnace, the force on the w

Method used

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  • Isothermal quenching nodular cast iron roller for push-pull vehicle on heat treatment production line and production method thereof
  • Isothermal quenching nodular cast iron roller for push-pull vehicle on heat treatment production line and production method thereof
  • Isothermal quenching nodular cast iron roller for push-pull vehicle on heat treatment production line and production method thereof

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Embodiment Construction

[0048] The working conditions of rollers can be divided into two categories: heavy load and light load according to the load. Under heavy load conditions, the surface pressure of the contact surface between the roller and the track is greater than 850 N / mm2. The high-carbon austenite part in the austempering ductile iron roller matrix of the present invention is transformed into high-carbon martensite, which can increase the hardness of the surface layer by about 10 degrees Rockwell hardness at most, can resist surface wear, and improve wear resistance; and The above processes continue to occur on the new sub-surface. The more it is worn, the harder it becomes. The surface layer is hardened while the core still maintains strong toughness. The outer hard and inner tough are both resistant to wear and impact. In this case, the present invention adopts a higher isothermal heat treatment quenching temperature to improve the toughness and extensibility of the roller to resist the i...

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Abstract

The invention discloses an isothermal quenching nodular cast iron roller for a push-pull vehicle on a heat treatment production line and a production method thereof. The nodular cast iron roller at least comprises Fe and also comprises the following elements in percentage by mass: 3.20-4.0 percent of carbon, 2.10-2.90 percent of silicon, 0.3-0.65 percent of manganese, less than or equal to 0.1 percent of phosphorus and less than or equal to 0.1 percent of sulfur. The nodular cast iron roller is made of isothermal quenching nodular cast iron, adopts a casting mode and isothermal quenching heat treatment and has high graphite self-lubricating performance, and a hardened layer can be generated in the operating process. Because the roller adopts the casting mode, the complex shape can be cast to be close to the final size, and the roller is subjected to heat treatment in an airtight environment with atmosphere protection after one-step finish machining only, so that surface oxidation and decarbonization are avoided. Then, the roller is transferred into a quenching tank with a speed-regulating stirring and water supply device for performing isothermal quenching heat treatment in an atmosphere protection environment, and acicular ferrite and high-carbon austenite metallographic structures are obtained.

Description

technical field [0001] The invention relates to an austempered nodular cast iron roller used for a push-pull cart in a heat treatment production line and a production method thereof, in particular to a nodular cast iron adopting austempering, which has graphite self-lubricating properties and can produce a hardened layer during operation The invention discloses an austempered nodular cast iron roller for a heat treatment production line push-pull cart and a production method thereof. Background technique [0002] The rollers, which are the key parts of the push-pull carts in the heat treatment production line, will directly affect the service life, production efficiency, quality and cost of the equipment. The current customary roller is made of low-carbon alloy steel, which is subjected to carburizing and quenching heat treatment after mechanical forging, preliminary turning, and finishing turning, and then mechanical processing. [0003] Carburizing and quenching heat trea...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C21D1/20C21D9/38
Inventor 陈明志陈奕安
Owner 上海宝华威热处理设备有限公司
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