Cryogenic workbench, cryogenic laser peening experiment system and control method therefor
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Solution Overview
Problem
Current cryogenic laser shock strengthening technologies face limitations in temperature adjustment range, response speed, and precision due to slow cooling and heating rates, uneven temperature distribution, and high liquid nitrogen consumption.
Innovation Solution
A cryogenic laser shock strengthening experimental system that employs an electromagnetic suction force to adjust the conical surface gap, precisely controlling the volume of liquid nitrogen gasification and thus the sample surface temperature, using a cryogenic workbench with a conical groove and projection design and a PLC integrated control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid nitrogen is used as cooling medium for the whole cryogenic treatment chamber, then the cryogenic laser shock strengthening can be accomplished, but the cooling and heating rate is slow and the temperature distribution is uneven
Solution Approach 1:
The invention divides the cooling system into two parts: (1) liquid nitrogen cooling the working table through the conical gap, and (2) air cooling the cryogenic treatment chamber. This segmentation allows the working table to be cooled rapidly while the chamber maintains a stable cryogenic environment, resolving the contradiction between rapid cooling rate and temperature uniformity.
Solution Approach 2:
The invention applies different cooling methods to different locations: the working table surface receives intense localized cooling from liquid nitrogen through the conical gap, while the chamber receives gentler air cooling. This local quality differentiation enables rapid surface temperature adjustment without causing uneven temperature distribution in the entire chamber.
2Temperature
If liquid nitrogen is used to control surface temperature by heat conduction, then cooling effect is achieved, but the response speed of temperature regulation is slow and control precision is low
Solution Approach 1:
The invention employs a feedback control system where temperature sensors monitor the working table temperature and the PLC adjusts the liquid nitrogen flow rate through the electromagnet-controlled conical gap accordingly. This closed-loop feedback enables precise temperature control with rapid response, directly resolving the contradiction between cooling effectiveness and control precision.
3Temperature
If liquid nitrogen is used in large amount for cooling, then the cryogenic treatment can be maintained, but the cost is higher
Solution Approach 1:
The invention extracts the liquid nitrogen cooling function from the entire chamber cooling system and applies it only to the working table through the conical gap. This extraction dramatically reduces liquid nitrogen consumption while maintaining the necessary cryogenic conditions for laser shock strengthening, resolving the contradiction between temperature maintenance and substance loss.
4Measurement precision
If the conical surface gap is adjusted to control liquid nitrogen gasification volume, then temperature control precision is improved, but the device complexity increases
Solution Approach 1:
The invention replaces manual mechanical adjustment of the conical gap with an electromagnet-driven automatic control system. The electromagnet adjusts the gap between the conical projection and groove based on PLC commands, substituting complex manual mechanical operations with simpler electromagnetic actuation, thereby reducing overall device complexity while improving control precision.
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 system enhances temperature adjustment range, response speed, and precision, reduces liquid nitrogen usage, and lowers processing costs while maintaining high processing efficiency and precision.
Implementation Method 1
uses the electromagnetic suction force to adjust the conical surface gap to precisely control the volume of liquid nitrogen gasification
Implementation Method 2
adjusting the heat absorption of liquid nitrogen gasification to control the temperature of the sample surface precisely
Data Source
AI summary
In a cryogenic workbench, a cryogenic laser peening system and a control method, a tapered surface gap d is adjusted, based on the electromagnetic principle, to control the gasification volume of liquid nitrogen, then the temperatures of the copious cooling workbench and the surface of a sample are precisely controlled by means of the adjustment of the heat absorption amount of liquid nitrogen gasification, the temperature adjustment range and the temperature rising/lowering rate of the cryogenic laser peening system are effectively extended, and the precision of the control of the surface temperature of the sample is increased in combination with a closed-loop control. Additionally, an intelligent control of a cryogenic laser peening process is realized by means of a computer and a PLC control unit, whereby the usage amount of liquid nitrogen in the experiment process is reduced and the processing efficiency is improved.