Induction melting furnace is an indisputable position used as melting equipment in the foundry

Performance comparison between intermediate frequency induction melting furnace and power frequency induction melting furnace (take cast iron as an example)

Serial number	Comparison index	Medium frequency induction melting furnace	Power frequency induction melting furnace	Comment
1	Power density	600-1400 kW/t	300 kW/t	The allowable value of configuration power density per ton of furnace capacity varies with frequency
2	Melting operation method	Batch melting	Residual liquid melting method
3	Requirements for adding materials	Small requirements	High standard
4	Melting unit consumption	500 ~ 550 kWh/t	540 ~ 580 kWh/t	Due to the high power density of the intermediate frequency induction melting furnace, the small heat loss, short melting time, and high overall efficiency
5	Power adjustment range	0~100% stepless adjustment	Step adjustment	The power adjustment of the industrial frequency furnace also involves the adjustment of the three-phase balance, which is more complicated
6	Automatic power adjustment	Can	difficulty
7	The stirring effect of the melt	Adjustable	Large and fixed	The stirring effect of the intermediate frequency induction melting furnace changes inversely with the change of frequency
8	Power consumption ratio	30 ~ 40%	100%
9	Power repair amount	Smaller	Bigger
10	Fault diagnosis and protection function	Completely, strong	Partly
11	Possibility to connect to the computer	Can	difficulty	Intermediate frequency induction melting furnace can be connected with the automatic control and management system of the computer melting process
12	Total investment ratio	~ 90%	100%

Allowable values of electric furnace power density at different frequencies (cast iron and steel)

Frequency (Hz)	1000	500	250	125	50
Electric furnace capacity (t)	0.2~1.5	0.6~6	1.1~18	2.5~60	8~100
Power density (kW/t)	1345	945	670	475	300

The higher the operating frequency of the electric furnace, the higher the allowable power density value. At present, the power density of medium frequency induction melting furnaces manufactured abroad is usually configured to 600-800 kW/t, and the power density configuration of small-capacity melting furnaces can be as high as 1000 kW/t. The power density of domestically manufactured intermediate frequency induction melting furnaces is usually configured to about 600 kW/t. This mainly takes into account the two factors of the service life of the furnace lining and the production management, because the furnace lining working under the condition of high power density is washed by the strong melt stirring effect.

From the above analysis, it can be seen that compared with the power frequency induction furnace, the intermediate frequency induction melting furnace has an indisputable status as a melting device in a modern foundry in terms of technical performance, operational performance and investment.