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SEALED QUENCH FURNACE

INTRODUCTION

The multipurpose batch type chamber furnace plants or Sealed Quench Furnaces has revolutionized the heat treatment industry in the last few decades thanks to its versatility, easy integration in automatic treatment lines, providing flexibility of metallurgical processes, product mix and layout, with maximum quality heat treatment in terms of reliability, predictability and repetitiveness.
These plants are normally coupled with companion equipment like Preheating and Tempering Furnaces, Washing Machines, Stationary Table, Scissor Lifts and fully automated one or more Charge Transfer Cars- all designed for maximum reliability.

APPLICATION

The horizontal chamber furnaces are used for various treatments such as case hardening and carburizing, neutral hardening, carbonitriding, normalizing, annealing, ferritic nitro carburizing, re-carburizing, spheroidize annealing and stress relieving, with quenching in oil, in protective atmosphere, in polymer and in salt.

The types of products which can be processed is quite large being Drive and Axle Components, Gears, Shafts, Fasteners, Bearing Components, Tools, Castings, Forgings, Agricultural machinery components, Construction Machinery components, Fine Blank Components and Precision Machined Components.

VERSIONS

Standard available and popular sizes are:
SL.NO FURNACE MODEL DHQF and SHQF CHARGE LENGTH in mm CHARGE WIDTH in mm CHARGE HEIGHT in mm GROSS CAPACITY in KG
1. TYPE 1/1 910 610 460 400
2. TYPE 2/1 1220 760 610 800
3. TYPE 2/2 1220 760 760 1000
4. TYPE 3/2 1220 910 760 1200
5. TYPE 3/3 1220 910 910 1500
6. TYPE 4/2 1520 1220 760 2200
7. TYPE 4/3 1520 1220 910 2500

NOTE

  • Other sizes may be available on request.
  • The figures above mentioned are charge space dimensions. Fixture dimensions are normally kept 50 mm less than charge space dimensions.

Some of the available options also include:

  • Heating System can be electrically heated through radiant tube heaters type E or Gas Fired through high efficiency recuperative burner system type G.
  • Gas used for heating and process can be LPG/Propane/Natural Gas supplied.
  • Available in the versions of Straight Through or TWO DOOR (TYPE DHQF) furnaces with one or more chambers, and In-Out or SINGLE DOOR (TYPE SHQF) furnaces with frontal loading/unloading.
  • Furnace atmosphere possible:
  • With Endogas and LPG/Propane/Natural gas
  • With Methanol and LPG/Propane/Natural gas
  • With Methanol + Nitrogen and LPG/Propane/Natural gas
  • With Direct Gassing Process by LPG/Propane/Natural gas and Air
  • Gas Carburizing possible:
  • With direct quenching
  • With intermediate cooling
  • With charge cooling under protective gas
  • Oil Cooling possible by Air or Water.
  • SCADA (Supervisory control and data acquisition system) to provide operational control, standard recipes and recipe management
  • Fully Automatic and Man less installation operated from the control room
  • Can also be equipped with Ferriitic-nitrocarburizing capabilities, so that it is possible to first do basic hardening in the conventional way followed by nitro-carburizing in the same furnace on the same batch

KEY CONSTRUCTION FEATURES AND ADVANTAGES OF LOI WESMAN SEALED QUENCH FURNACES

  • Available in a variety of batch sizes and capacities to suit optimum production requirements.
  • Available in Two Door and Single Door versions offering flexibility to suit availability of space and also the type of heat treatment to be carried out.
  • Fabricated out of heavy duty structural steel plates, reinforced and welded.
  • Furnace roof, walls and hearth are brick lined with special high insulation refractory bricks minimizing heat loss and low skin temperature.
  • Provision of silicon carbide muffle in heating chamber consisting of flat perforated hearth, solid verticals side walls and arch leading to excellent and accurate atmosphere and temperature uniformity with zero cold spots in the charge.
  • Flat hearth & absence of skids ensure low fixture weight thus increasing net loading.
  • Pneumatically operated brick lined doors specially designed with wedge locking mechanism for front and stainless steel inner door and unique Rear Door design with four horizontal locking cylinders, guarantees maximum sealing.
  • Totally enclosed drive system through Special transfer chain made out of anti carburizing alloy used for charge transfer from heating to quenching chamber.
  • Direct driven special two speed (high and low) and high volume recirculation fan comprising of hollow shaft motor and impeller, bung mounted on the furnace roof.
  • Hydro-pneumatically operated quench elevator and Inner Door with specially designed guide tubes provide smooth jerk-free movement and trouble free operation.
  • Use of long life Kanthal APM Radiant Tubes and cage type Heating Elements with power supply through thyristor for electrically heated versions and super efficient and trouble free recuperative burner system with cast radiant tubes for gas fired version.
  • Fully automatic operation through latest control systems, PLC and HMI with provision of recipe management and execution as well as operational control.
  • Vertically mounted variable speed propeller type agitators with guiding oil baffle.
  • On-demand flame curtain gets on only when unloading door operates.
  • Standard version is provided with atmosphere or forced cooling feature and suitable for operating temperatures up to 1000OC.
  • Imported critical components used giving long life and peace of mind.
  • Access Ladder and Catwalk for maintenance & Exhaust Hoods for fume extraction.
  • All elements easily approachable and removable for ease of maintenance.
  • Extremely Safe and simple in operation as well as easy to maintain.

For more information and to discuss on your Atmosphere Furnace requirements, contact Sushan Chakravorty at This email address is being protected from spambots. You need JavaScript enabled to view it.

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