Stirring inner water cooling isothermal quench salt bath

A technology of isothermal quenching and salt bath, applied in the direction of quenching agent, quenching device, heat treatment equipment, etc., can solve the problems of complex structure, high energy consumption, poor effect, etc., and achieve reduced temperature fluctuation, low energy consumption, and good quenching effect Effect

Inactive Publication Date: 2009-07-22
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of complex structure, high energy consump

Method used

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  • Stirring inner water cooling isothermal quench salt bath

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Embodiment Construction

[0013] As shown in the accompanying drawings, the workpiece frame 4 of the internal water-cooled austempering salt bath that can be stirred provided by the present invention is located in the salt bath tank body 12, and the tank body 12 is a cuboid shape, and rails 5 are equipped on both sides above it, and the top of the workpiece frame 4 A mobile frame 6 with rollers 7 is installed, and the rollers 7 are located in the track 5. The workpiece frame 4 is driven by the swing mechanism to perform parallel reciprocating motion along the track 5 through the mobile frame 6. The driving mechanism of parallel reciprocating motion can be used. In this embodiment, the swing mechanism adopts a rocker swing mechanism 9. The rocker swing mechanism 9 is composed of a motor 11, a reducer 10, a rocker arm and a connecting rod. The motor 11 is driven after deceleration. The rocker arm rotates, and the rocker arm drives the mobile bracket to reciprocate parallelly along the track 5 through the ...

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Abstract

The invention discloses a stirring inner water cooling austempering salt bath. The two sides above the salt bath are provided with orbits and a movable rack with rolling wheels which are arranged in the orbits, a work rest in the bath body is fixedly connected with the movable rack, and a work rest bearing the work pieces or work piece hurdles moves back and forth driven by a swinging mechanism through the movable rack to stir the salt bath, thus leading to the rapid heat dissipation and cooling of high temperature austenitizing work pieces and uniform temperature of the salt bath; and the inner walls on the two sides near the bath are provided with snake-shaped cooling pipes by which the bath is communicated with a cooling pool, and then circulating cooling water is pumped in the bath to strengthen the function of heat dissipation and cooling of the salt bath and cause the bath to rapidly return to the set austempering temperature. The churning inner water cooling austempering salt bath has the advantages of simple structure, convenient operation, less energy losses and stable salt bath temperature and the salt bath is applicable to small serial production and mass mechanized production. The salt bath can harden ADI pieces with the thickness being 80mm, thus avoiding the problems of not hardening matrix and residual ferrite (pearlite), so the salt bath is suitable for producing high-quality products.

Description

technical field [0001] The invention relates to a stirrable internal water-cooled isothermal quenching salt bath for heat treatment of austempering ductile iron (ADI), belonging to the technical field of austempering ductile iron heat treatment. Background technique [0002] Austempered Ductile Iron (ADI) is a casting engineering material emerging in the past 30 years with high strength, high wear resistance and certain toughness, and it is being continuously promoted and applied at home and abroad. The manufacturing process is: cast ductile iron rough casting (spherical graphite + pearlite and ferrite matrix) → complete austenitization heating (spherical graphite + austenite) → austempering (spherical graphite + bainite or needle ferrite + high carbon stable retained austenite). That is to say, the ductile iron rough casting is heat-treated to retain the nodular graphite and change the matrix structure to obtain excellent comprehensive mechanical properties. Austempering ...

Claims

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Application Information

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IPC IPC(8): C21D1/63C21D1/20C21D1/607C21D5/00
Inventor 龚文邦
Owner WUHAN TEXTILE UNIV
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