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TECHNICAL INFORMATION OF OUR FURNACE

APPLICATIONS

Heat treatment process
Vacuum hardening of tools and dies.
Vacuum brazing of steel and stainless Parts.
Vacuum annealing.
Vacuum tempering.

FURNACE SIZE AND CAPACITY

Useful Dimensions
Width : 900 Mm
Height : 800 Mm
Depth / Length : 1200 Mm
Maximum Gross Charge Weight : 1400 Kg.

TEMPERATURE:

Furnace maximum temperature :	1300 deg. C
Furnace operating temperature:	600-1300 deg. C under vacuum 150-800 deg. C under convective heating
Uniformity of Temp.	+/- 5 deg. C.
Within the hot zone Between 500 and operating Temp. after 1 hour soak Temp. Control and programming :	controllers part of plc. Programming through touch panel With user friendly tabular/ graphical Format.
No. Of thermocouples. :	2 nos. Of fixed thermocouple (1 connected to master ; 2nd connected to Safety controller) 4 nos. Flexible Thermocouple which can be connected To surface / core of component.
Special controller for temp. :	Every segment of program cycle can Be configured independently to have temp. Control through master thermocouple, Surface thermocouple, and core Thermocouple. Sac (set actual value comparison) is also
Special controller for temp. :	Every segment of program cycle can Be configured independently to have temp. Control through master thermocouple, Surface thermocouple, and core Thermocouple. Sac (set actual value comparison) is also programmable in every segment, which Ensures the soaking time to start when Surface and core have reached the Required set temp.

HOT ZONE

Thermal insulation :	Inner most layer is of hard board graphite backed by flexible graphite felt.
Heating system :	Unique design made from graphite plates all round and along the depth. This covers more surface area (as against tubes / rod type heaters) and ensures more uniform temp. Distribution in work space.

VACUUM

Ultimate vacuum	1.5 x 10-2 MBAR
Typical operating vacuum :	3-5x 10-2 MBAR
Pump down time from atmospheric pressure :	10 -2 mbar range in 15 min.

CONVECTIVE HEATING

System :

A separate cc fan mounted on front door for uniform heating under nitrogen gas pressure up to 2 bar. This ensures better heat transfer during heating in lower temp. Range up to 800 deg .C Tempering cycle also with convective heating.

QUENCHING

System :	cylindrical heating with all round nozzles. Front insulation on door also provided with nozzles which can be opened and closed for convective heating and quenching.
Gas circulation and cooling :	high capacity water cooled recirculation fan motor with VFD and high water flow finned heat exchanger for rapid gas quenching.
Quenching pressure :	10 bar abs. Nitrogen.
ISO quench :	controlled cooling by monitoring surface and core temperature and varying fan motor speed, gas pressure and switching on / off heating.

HOST MANAGEMENT

System :

computerized process monitoring and recording of complete cycle and batch reports. Remote monitoring and diagnostics from Germany.

SALIENT FEATURES

Sr. No.	Specifications	Advantages
1	Furnace size : 900mm W x 800mm H x 1200mm D capacity : 1400 kg	Largest furnace size in India. Vacuum hardening of large dies possible.
2	Round design	Possible to load wider parts of certain thickness
3	Nitrogen quenching pressure : 10 bar abs	Hardening of thick section parts possible
4	Cylindrical hot zone with all round heating through strip type graphite heaters. Continuous PID control through frequency converter.	Uniform and excellent heat distribution.
5	Convective heating under nitrogen gas upto 2bar through separate "CC" fan mounted on front door	Better heat transfer during heating in the lower temp. range up to 800°C
6	Cylindrical cooling zone with all round nozzles. Front insulation on door also provided with nozzles Front insulation on door also provided with nozzles which can be opened and closed for convective heating and quenching.	Uniform gas distribution on all sides during convective heating & quenching.
7	Graphite Insulation consisting of hard felt board and CC sheet cover	Prevents soft felt flying all over during high pressure quenching.
8	High capacity re-circulating fan with water cooled motor and high water flow finned copper heat exchanger for gas quenching.	Guarantees best possible heat transfer. High gas speeds are obtained. Large volumes of gas quantities are circulated. This maximizes heat transfer to heat exchanger.
9	Pumping system: LH make 2nos. Rotary vane pumps 2 x 200m3/hr and 1no. Roots pump 2000m3/hr Vacuum level in the range of 10-2 mbar	Faster evacuation
10	Set / actual value: Actual value of the furnace temperature to control the heaters is measured by the control thermocouple. The temp. of the load is additionally compared with the set value. The set value is in a programmed range of temperature. The programmed soaking time is hold till the furnace temp. reaches this programmed range of temp. Through this set / actual value comparison soaking or holding times are controlled exactly.	This makes sure that soaking / holding times are executed as programmed.
11	ISO Quench: The temp. of surface and core of work piece / dummy charge is measured by two flexible thermocouples. The difference between these temps. is monitored and controlled by varying speed of quench fan motor through frequency converter. If required during quenching cycle, heating will also be switched `ON'.	The isotherm quenching is favorably applied for big work pieces and work pieces with extreme cross section difference and complicated shapes to prevent cracks and to minimize distortion.
12	Regulation and control system Touch panel with computer for operating and programming of vacuum furnace is provided.	User friendly Programming of Heat Treatment cycles including quenching speeds / ISO quench, etc. Excellent process visualization screens. Computerized data logging batch report

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