Vacuum Carburizing Pulse Time Calculation for Carbon Mass Control
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Solution Overview
Problem
Current vacuum carburizing methods lack accurate calculation of boost and diffusion times based on carburized mass, leading to inefficiencies and high energy consumption due to insufficient control over carbon concentration distribution.
Innovation Solution
A method for calculating vacuum carburizing pulse time using a carburized mass as a target, adjusting the number of pulses, and employing Fick's law through finite difference or finite element methods to achieve precise control of carbon concentration, reducing errors to less than 0.1%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional one-stage or two-stage carburizing methods are used, then the process is simpler to operate, but the control over carbon concentration distribution is insufficient and energy consumption is high
Solution Approach 1:
The carburizing process is divided into multiple discrete pulses, each consisting of inflation, pressure maintenance, and evacuation phases. This segmentation allows precise control over carbon concentration distribution by adjusting individual pulse parameters (pressure, duration, frequency) while maintaining overall process simplicity through automated sequencing.
Solution Approach 2:
The patent implements periodic pulse carburizing with alternating inflation and evacuation phases. This periodic action creates controlled cycles of carbon supply and removal, enabling refined control of carbon concentration distribution in the workpiece surface while reducing total energy consumption compared to continuous carburizing methods.
2Manufacturing precision
If pulse carburizing with multiple phases is implemented, then the control over carbon concentration is refined and carbon black generation is reduced, but the process parameters become more complex to calculate
Solution Approach 1:
The patent incorporates feedback mechanisms where carbon concentration measurements from previous pulses inform adjustments in subsequent pulse parameters. This feedback loop enables refined control of carbon concentration distribution while automating the complex parameter calculations, reducing operational complexity despite the multi-phase process structure.
Solution Approach 2:
The carburizing process parameters (pressure, time, frequency) are made dynamically adjustable based on real-time monitoring of carbon concentration and workpiece state. This dynamic adaptation allows the system to maintain optimal control precision while simplifying operation through automated parameter optimization rather than manual calculation.
3Manufacturing precision
If carburizing time is extended to achieve target carbon concentration, then the carburized layer depth increases, but the energy consumption and process duration increase
Solution Approach 1:
The patent maintains continuous useful action during the carburizing process by overlapping diffusion periods across multiple pulses. While inflation phases add carbon, the evacuation phases are optimized to remove excess carbon black without significant carbon loss from the workpiece, maintaining continuous progress toward target carbon concentration and reducing total process duration.
Solution Approach 2:
The patent dynamically changes process parameters (pressure, temperature, pulse frequency, duration) based on the evolving carbon concentration state. By adjusting these parameters in response to real-time conditions, the system achieves precise control of carburized layer depth while minimizing unnecessary process time and energy consumption compared to fixed-duration traditional methods.
4Manufacturing precision
If the number of carburizing pulses is increased, then the control over carbon concentration distribution is improved, but the total process time and computational complexity increase
Solution Approach 1:
The patent applies partial action by using a limited number of optimized pulses rather than excessive pulsing. Each pulse is carefully calibrated to contribute meaningfully to the target carbon concentration distribution, avoiding unnecessary pulses that would increase process time and computational load without adding proportional value to the final result.
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
Accurate calculation of carburizing time reduces energy consumption and process duration, enhancing efficiency and adjustability in vacuum carburizing processes.
Implementation Method 1
in the diffusion process, the carbon concentration at material surfaces decreases by the diffusion of carbon in the material
Data Source
AI summary
The present invention provides a method for calculating vacuum carburizing pulse time and a non-transitory storage medium. The method includes: determining a target surface carbon concentration, a target carburized carbon mass md, material parameters, a number of carburizing pulses, a left value Cl,l of a target surface carbon concentration low point, a right value Cl,r of the target surface carbon concentration low point, and an error E; obtaining a carburized carbon mass ml at Cl,l until ml≥md; obtaining a carburized carbon mass mr at Cl,runtil mr≤md; calculating Cl,m; and obtaining carburized carbon mass mm at Cl,m and a sum of boost time and diffusion time of all carburizing pulses, when |mm−md|≤E, the sum of the boost time and diffusion time of all the carburizing pulses is pulse time.