Double-Walled Quenching Chamber for Bainitic Transformation
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Solution Overview
Problem
Existing dry austempering methods for heat treatment of metallic components, such as 100Cr6 steel, face challenges in maintaining a stable quenching temperature, leading to potential interference with the formation of the desired bainitic structure due to temperature oscillations and cooling rates, particularly in thin-walled areas or corners.
Innovation Solution
A double-walled quenching chamber with a heat exchange fluid is used, where the inner wall is heated or cooled to maintain a consistent temperature, stabilizing the gas temperature within the chamber and preventing it from falling below the martensite start temperature, ensuring reliable bainitic structure formation. This involves a heat exchange fluid circulation and a regenerative cooling unit to manage heat dissipation and absorption efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gas flow is used for quenching in dry austempering, then the quenching process can be performed without salt baths, but the gas temperature oscillates about the setpoint temperature due to system response delays
Solution Approach 1:
The quenching chamber walls are preheated to the bainitic structure tempering temperature before the quenching process begins. This preliminary heating ensures that when hot workpieces are introduced, the chamber walls act as a thermal reservoir to maintain gas temperature stability, preventing oscillations that could cause martensite formation.
Solution Approach 2:
The quenching chamber walls serve as a thermal intermediary between the external environment and the quenching gas. By heating the walls to the target temperature, they mediate temperature fluctuations in the gas, ensuring stable thermal conditions for bainitic transformation without direct control of gas flow dynamics.
2Productivity
If rapid cooling is applied to achieve bainitic structure, then transformation speed increases, but the temperature may fall below the martensite start temperature, causing unwanted martensite formation
Solution Approach 1:
The quenching chamber walls are preheated to the bainitic structure tempering temperature before introducing workpieces. This creates a thermal buffer that compensates for heat extraction during rapid cooling, ensuring the temperature remains above the martensite start temperature while still achieving rapid bainitic transformation.
Solution Approach 2:
The system changes the thermal state of the chamber walls from ambient temperature to bainitic tempering temperature. This parameter change in the boundary conditions allows rapid cooling to proceed without dropping below the critical martensite start temperature, maintaining manufacturing precision while improving productivity.
3Speed
If edge regions of thin-walled components are exposed to quenching gas, then they rapidly absorb heat and reach gas temperature, but this causes temperature oscillations that endanger structural development
Solution Approach 1:
The preheated quenching chamber walls act as a thermal intermediary that buffers the rapid heat absorption by thin-walled edge regions. The walls maintain a stable thermal field that prevents temperature oscillations, ensuring consistent structural development even in components with high heat absorption rates.
Solution Approach 2:
By preheating the chamber walls to the target temperature, the system creates a thermal cushion that compensates for rapid heat absorption by thin-walled areas. This beforehand cushioning prevents temperature drops that would otherwise cause martensite formation in regions with high thermal conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures that the semifinished parts are maintained above the martensite start temperature throughout the quenching process, preventing interference with the bainitic structure formation and achieving a stable quenching process by effectively regulating the temperature within the quenching chamber.
Implementation Method 1
Heating and/or cooling means of an installation for the dry transformation of a material structure of semifinished parts are developed, according to the present invention, as heating or cooling means of a wall bordering on an inside chamber of a quenching chamber
Implementation Method 2
a heat exchange fluid circulation and a regenerative cooling unit to manage heat dissipation and absorption efficiently
Implementation Method 3
the temperature in the quenching chamber is able to be determined primarily and preponderantly by the temperature of the chamber wall bordering on the inner chamber
Data Source
AI summary
An installation for the dry transformation of a material structure of semifinished products, particularly for dry bainitization, includes a quenching chamber and heating and/or cooling mechanism for setting the temperature prevailing on the inside of the quenching chamber, wherein the heating and/or cooling mechanism is developed as heating or cooling mechanism of a wall that borders on an inner chamber of the quenching chamber.