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PHONG VA THV C NGHIEM TRUON G DI£ N T 0 VA THONG LUONG NHIET PHA N B 6

TR£ N TA M THE P TRONG GIA NHIET CAM U>^G

:MULATI0N S AN D EXPERIMENT S O F ELECTROMAGNETIC FIELD AND HEAT FLUX

DISTRIBUTION ON THE STEEL PLATE IN INDUCTION HEATING

NCS. Tran Thi Thiiy Nga', TS. Nguyen Trfldng Thinh^ PGS, TS. Tran Thu Hi^

'Trfldng Cao dang Ky thuat Cao Ihang

^TrUdng Dai hpe SU pham Ky thuat Tlianh ph6 Hd Chi Minh

ITAT

Detao hinh bien dang cua thep tam bdng nguon nhiet, phUdng phdp gia nhiet cdm dngdUdcsii

I de thay the cho nguon nhiet khi Oxy-axetylen, von khong cd nhieu Uu diem trong viec tao hinh bien

J thep tdm vd tau. Gia nhiet cdm dng Id phUdng phdp dUa tren hien tUdng cdm dng dien tii, khi cho

I dien tdn so cao chay trong cuon ddy, ddng dien ndy se sinh ra xung quanh nd mot tii trUdng hien

1 theo thdi gian, cd tdn so ciing vdi tdn so ci^a ddng dien trong cudn ddy. Khi ta dat ben dUdi eudn ddy,

^ vung dnh hUdng ciia tii trUdng mot tdm thep, thi trUdng dien td ndy se tao nen mgt ddng dien khep

ren be mat tdm thep vd nung ndng tdm thep theo hieu dng Joule-lenz. Tren cd sdphdn tich FEM, mdt

I gidi phdp cho phdn tich bao gom cuon ddy dang dia vdi mgt niia vdng ddy doi xiing true dUde ldm

; vat lieu dong, tdm thep vdi vdt lieu AH-32 vd vung khdng khi cho phdn tich. Khi tdn so dong dien

ig doi, mat do trUdng dien tii vd thdng lUdng nhiet phdn ho tde thdi tren tdm thep thay doi khi edc

1 so gia nhiet thay doi nhU: be ddy tdm thep, khodng edeh tii vdng ddy den be mat tdm thep vd eUdng

dng dien trong cudn ddy. Sd thay doi ndy tao nen mgt vung dnh hUdng nhiet tdc thdi, tUdng dng md

Udc sd dung nhu mot nguon nhiet ddu vdo trongphdn tieh ddng nhiet vd bien dang cua tdm thep

', phUdngphdp gia nhiet cdm dng.

TRACT

To control the deformation of plate in the steel forming process with heating, the electro-magnetic

uction process has been used as the substitute of the flame heating process, which did not have many

vantages in deforming the steel hull plates. Induction heating, a method based on the phenomenon of

ztromagnetic induction, when the high-frequency current flows through an inductor that is located

zr the conductor of a steel plate. This current generates a magnetic field around it varies over time, with

quency the same the frequency of electric current in the inductor. This electromagnetic field generate on

teel plate surface an eddy current and steel plate heated by Joule-Lenz effect. On the basis of FEM analy-

. an analytical solution domain consists of a disk coil with a hafl symmetrical axis are made of copper,

el plate with the material properties of the AH32 steel and air With frequency is constant, electric field

d density of heat flux distribution on steel plate are change when heating parameters changes, such as

ckness of steel plate, distance from the coil to steel plate surface and current in the coil. This changes

ate an instantaneous heat affected zone, respectively, which it is used as source of the heat input for heat

w and thermal-mechanical deformation of steel plate in induction heating method.

Keywords: Finite element method. Induction heating, Numerical analysis. Electro-magnetic in￾iction, Heatfiux analysis, HAZ.

TAP rHTX^rtK-HT VIETNAM *t* Sd 7 (Thing 7 nam 2012) ^ 9