Energy Information Monitoring Of Vacuum Gas Quenching Furnace

Vacuum heat treatment has no oxidation, no decarbonization, no carburizing,skim degassing, bright surface and purification, etc., as well as high performanceproducts after heat treatment, and is widely used in machinery, metallurgy, energy,transportation, aerospace, construction, light engineering, textiles, weapons, vehicles,electrical and electronic industries. However, due to the current vacuum heattreatment the cooling rate did not achieve automatic control, mainly by experiencedoperatives to achieve the cooling rate adjustment, which resulted in product qualityand reproducibility not to good protection. With the increasingly high demand respectto product quality from corporate and customers, to achieve automatic control of thecooling rate is an urgent need to address the problem.The purpose of the thermal information control system is obtains the informationwithin the furnace by the hardware, for example thermocouple, out of the vacuumfurnace, and thus to achieve a cooling rate in the cooling process is controlled. Thepaper has established thermal information monitoring information system, and it hasin-depth analysis about The working principle, designing process, reliability, accuracyof each of the major components of the information systems. The system is dividedinto two parts, including hardware and software, hardware includes: vacuum gasquenching furnace, data acquisition card of USB-6251, the circuit of temperaturesignal acquisition and the selection, installation and testing of the liquid flow meter;the part of software is based on LabView’s energy information collection、processingalgorithms and the designing of cooling speed control.By establishing the relationship between the calculating temperature informationand measured temperature information of a furnace, contacting the side information offurnace and the out of furnace together, and then use the outside temperatureinformation of furnace to reflect the inside temperature information of furnace.Comparison the calculated cooling rate and the ideal cooling rate curve.By Experiments to test the entire system, and hardness values measured,microstructure analysis and hardenability testing the workpiece which has been heattreatment, verification of the entire system.So as to realize the system in production,the quality of the workpiece after heat treatment preliminary assessment.The paper starts working on each part of the system for analysis and calculations about theoretical, and then verify the feasibility of each part of the program. Throughseveral different experiments, measuring hardness and observation microstructureanalysis of the workpieces which is after the heat treatment. Determine the coolingrate curve and microstructure and hardness values are consistent, for the detection andevaluation of the entire energy monitoring system, and ultimately provide a basis forautomated control of cooling rate of vacuum heat treatment.