Hi people. I need to know if exist an practical formula to calculate the heating time of a steel part put in an gas furnance to reach forging temperature?
You will need the heat transfer from gas furnace to the steel part as follows:
1) Calculate the heat transfer rate by convection mode.
2) Calculate the heat transfer rate by radiation mode.
3) Calculate the heat transfer by conduction through the steel part.
4) sum up all these three heat transfer rates.
5) The sum from step #4 is equated to the mass of the steel part times its heat capacity times the temperature rise.
6) From the temperature rise, calculate the final temperature of the steel part. Using this lumped parameter approach is the simplest way otherwise you need to solve the problem as an unsteady state heat transfer problem.
Hope this helps answer your question.
Professor Yehia Khalil
Yale University
USA
I think that this steel part can be considered as a lumped system, then you can use the calculations and procedures for lumped systems in the attached files
Many, many thanks Eslam. This information is very useful for me!!!!
There is the long way as Professor Khalil from Yale mentioned above and the short one which is just measure the temperature with the proper instrumentation.
The metal is heated in a gas oven will depend upon: the dimensions of the workpieces; the size of the heating furnace; the difference in volumes between space heating and heating metal, specific conductivity of the metal; the heating rate of the workspace layout of the heating burners to the position of the workpiece, the pressure in the workspace, etc .. In general heating depends on the specific heat exchange between detail and heating equipment.
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