Austempering Quench Apparatus with Gas Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing austempering methods for metallic workpieces face challenges with costly and inconvenient quenching processes, varying cooling rates, lack of temperature control, residue formation, and environmental pollution, particularly due to the use of salt baths or oil baths.
Innovation Solution
A method and system for austempering that utilize a quench apparatus with a precisely controlled cooling fluid flow and thermal radiation, allowing for a defined time-temperature profile (T(t) = T0 + T1[1 + tanh(-t/τ)] to achieve consistent temperature progression, using air, nitrogen, or hydrogen as cooling fluids, and steam or air as heat fluids, with electronic closed-loop control of temperature and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If salt baths or oil baths are used for quenching, then the workpieces can be cooled, but the cooling rate varies significantly at the workpiece surface due to bubble formation
Solution Approach 1:
The patent uses a gas cooling system where a cooling gas (such as nitrogen, carbon dioxide, or air) is directed onto the workpiece surface through nozzles. This pneumatic approach eliminates the bubble formation problem inherent in liquid baths, providing uniform cooling without variation in cooling rate across the workpiece surface.
Solution Approach 2:
The patent incorporates temperature sensors that continuously monitor the workpiece temperature during quenching, with a control unit that adjusts the cooling gas flow rate in real-time to maintain a constant cooling rate. This closed-loop feedback system ensures precise temperature control throughout the quenching process.
2Temperature
If salt baths or oil baths are used for quenching, then the workpieces can be cooled, but residues are formed on the workpieces requiring intensive cleaning
Solution Approach 1:
By replacing liquid quenching media with a gas-based cooling system, the patent eliminates residue formation entirely. The cooling gas cools the workpiece without leaving any residual material on the surface, thereby eliminating the need for intensive cleaning operations while maintaining effective cooling capability.
3Temperature
If salt baths or oil baths are used for quenching, then the workpieces can be cooled, but the process pollutes the environment
Solution Approach 1:
The patent replaces environmentally polluting liquid quenching media (salt baths and oil baths) with inert cooling gases such as nitrogen, carbon dioxide, or filtered air. These gases do not pollute the environment during or after the quenching process, eliminating the harmful environmental effects associated with traditional liquid-based quenching while maintaining the cooling function.
4Temperature
If salt baths or oil baths are used for quenching, then the workpieces can be cooled, but the process is costly and inconvenient in terms of plant and process engineering
Solution Approach 1:
The patent employs a gas-based quenching system with modular components including gas storage vessels, flow control valves, and nozzle arrays that can be configured for different workpiece geometries. This approach simplifies plant engineering compared to liquid bath systems, reducing issues with fluid handling, contamination, and safety while maintaining effective cooling capability.
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
This approach enables precise control of workpiece temperature, reduces energy consumption, and provides an efficient, automated, and environmentally friendly austempering process, minimizing residue formation and pollution.
Implementation Method 1
a cooling fluid is allowed to flow through the quench volume V
Implementation Method 2
with thermal radiation from the tempering bodies
Implementation Method 3
with radiation from one or more heating elements disposed in the quench apparatus
Data Source
AI summary
In a process and an apparatus for austempering, metal workpieces and optional tempering bodies are quenched in a quenching volume V of a quenching apparatus, in which the quenching volume V is flowed through by a cooling fluid, and the workpieces are tempered by thermal radiation of the tempering bodies, by thermal radiation of one or more heating elements arranged in the quenching apparatus, or by a thermal fluid in such a way that an average temperature T(t) of the workpieces follows a progression over time according to the relationshipT(t)=T0+T1[1+tanh(-tτ)]where t is the time in seconds, 150° C.≤T0≤250° C., 600° C.≤T1≤820° C., 12 s≤τ≤24 s, 0 s≤t≤Γ and 180 s≤Γ≤240 s.