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TP2 copper pipe line induction annealing and final annealing

Author: PengLiHong
Tutor: ZhaoHongJin
School: Jiangxi University of Technology
Course: Materials Processing Engineering
Keywords: TP2 copper tube Numerical Simulation Influencing factors Microstructure Mechanical properties
CLC: TG156.2
Type: Master's thesis
Year: 2011
Downloads: 96
Quote: 0
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Abstract


Rapid economic development to promote the development of the air-conditioning market, the application of a new generation of refrigerant (R134a) is more and more demanding quality requirements for air conditioning, as people's awareness of environmental protection at the same time, TP2 within threaded brass has become the production of heat exchangers efficient heat transfer tube evaporator and condenser preferred in green environmentally friendly CFC-free air conditioning and refrigerator. Heat exchanger toward high performance, small size and low quantization direction, prompting the brass to the development of high-clean, high-performance, high-precision, high value-added direction, so the the brass processing industry must go professional, high-efficiency large-scale road. The annealing process is particularly important in the production of brass, the line induction annealing control the yield of the inner thread forming control the microstructure and mechanical properties of the final product, while the finish annealing, brass annealing process has certain production guidance significance. The subject comes from the National Science and Technology Support the plan (2007BAB22B00) - large diameter plastic coated inner grooved copper tube production technology research. TP2 copper tube for the study, induction heating theory, the establishment of a mathematical model of the copper pipe line induction annealing process, the use of finite element software DEFORM-2D temperature field of copper pipes were simulated, and analysis of the main factors affecting the distribution of temperature field . The online induction annealing brass mechanical testing analysis of the main factors to affect the microstructure and mechanical properties of the brass. The the line induction annealing process parameter is the line speed and voltage, and to analyze the relationship between the copper key process parameters and geometrical dimensions, and create a mathematical model, to provide a theoretical basis for the formulation of the annealing process parameters. Finally finished after annealing brass mechanical testing, analysis of the the copper coil mechanical properties of instability and the cause of the hard core layer phenomenon. Online induction annealing simulation analysis, draw the line speed, current density, heating frequency induction coil size and brass geometry will affect the temperature distribution of brass. In the annealing process, brass skin effect, based on a large number of experimental data, the preferred medium frequency induction heating. Mechanical testing, draw grain size, the copper tube geometry as well as the ambient temperature will affect the microstructure and mechanical properties of the brass. In the analysis of the main process parameters obtained the brass line speed - the mathematical model of the voltage curve U = AB 1 V l B 2 V l 2 . Finally, in finished annealed brass mechanical testing, come to the surface of the brass grain size is larger than the core brass, brass core stiff. Copper coil surface and core temperature difference in the production of early entry into the cooling phase, in order to shorten the time of overheating of the surface of the copper tube, in order to achieve the copper coil surface and core of the organization and consistent performance.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process > Annealing
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