Continuous Conveyor Hardening & Tempering Plants

Process Capabilities
  • Neutral Hardening & Tempering
  • Carbonitriding
  • Shallow Case Carburising
  • Austempering
  • Carbon Restoration &
    Hardening

Consistency of quality is better obtained when components are continuously quenched, a few pieces at a time instead of in a batch at periodic intervals. Of the total tonnage of heat treated components the majority do not require fixturing and can tumble into a quench tank. The ideal plant for all such components in terms of quality, capital cost as well as operating cost is a continuous conveyorised heating and quenching system. Components spend less time at temperature and consume less energy compared to batch furnaces. Continuous quenching, a few components at a time, ensures a high degree of quality consistency in terms of hardness, case depth and physical properties. Such plants with conveyorised auxiliary equipment for loading, washing and tempering are normally fully automated.


CONTINUOUS (SINGLE & TWIN) TUBE HARDENING & TEMPERING FURNACES
Equipment Features
LOADING

Soft handling, weigh feed, metered loading, vibratory conveyor, reciprocating feeder.

WASH MACHINES

High intensity jet spray, dunk & spray, steam wash, ultra sonic, vapour degreasing & in line centrifuge, drying, continuous dirt filtration, oil seperation/recovery, salt recovery.

FURNACE

Gas tight hardening furnace shell, microporous insulation, atmosphere circulation, alloy belt with raised edges & auto alignment, electric radiant tube heaters, multizone thyristorised temperature control, gas fired recuperative radiant tubes, waste heat recovery from spent atmosphere & by hot belt return, multi atmosphere capability, endogas generator, methanol dissociater, PSA, onsite nitrogen & ammonia cracker.

QUENCHING

Oil, hot oil or polymer, clog resistant cascade curtain, variable agitation, continuous dirt removal, air/water heat exchangers, air knife, electric heaters or gas tube burners, temperature, level & flow controls.

TEMPERING

High convection (high uniformity) tempering, rapid heat up feature, jet heating system, nitrogen atmosphere capability, steam tempering facility, post temper blackening tank.

CONTROLS

computer/touch screen HMI for user interface, SCADA programming based automatic plant and process control, production alarm & energy logging, several reporting formats.

UNLOADING

into bins, weigh & discharge, auto bagging with data acquisition.

EXTRAS

chiller tank (for 52100 steel parts, where required).



Typical Components Processed
bearing parts, chain parts, fasteners, springs, circlips, needles, appliance parts, auto parts, lock parts, hand tools, shoe shanks Hardening & Tempering
chain parts, screws, appliance parts, auto parts, PM parts, bicycle parts, bearing parts Carbonitriding / Shallow Case Carburising
Carbonitriding / Shallow Case Carburising Austempering

Introducing the…
CTF & CTTF CONTINUOUS SINGLE & TWIN TUBE
Hardening and Tempering Furnaces for Mass Produced Parts
50 – 1000 Kg / Hr

  • Eliminates expensive to operate mesh belt furnaces
  • 30% to 60% less energy consumption- no belt, no heat lost to belt!
  • Several lakhs / year saved - no more mesh belt purchases!
  • Great quality consistency CPK ≥ 3.0
  • Can handle a wide range of parts - 60% of all parts that mesh belt furnaces can
  • Simultaneous processing of different parts in twin tube (CTTF) furnaces, ideal for wide variety/small lot production
  • Total above ground installation, no pits
  • Visible, accessible, easy & low cost maintenance
  • Zero part mix up (in the maglift version)
  • Continuous ejection of scale, metal dust and burrs from the quenchant

Gentle material transport through one or two low rpm rotating alloy tubes with internal flights in the hardening furnace and the same or mesh belt in the tempering furnace

STANDARD & OPTIONAL FEATURES OF CTF & CTTF HARDENING PLANTS
LOADING Soft handling, weigh feed, metered loading, reciprocating feeder
WASH High intensity jet spray, dunk & spray, steam wash, ultra-sonic, vapour degreasing, in-line centrifuge, continuous dirt filtration, oil separation & recovery, salt recovery, waste heat utilization & in-line drying.
AUSTENITISING, CASE HARDENING Gas tight furnace shell, microporous insulation, alloy transport tubes, radiant tube heaters, Thyristorised temperature control, gas fired recuperative radiant tubes, multi atmosphere capability, internal & external endogas generator, methanol dissociator & ammonia cracker.
QUENCHINGOil, hot oil or polymer, clog resistant cascade curtain, agitation, continuous dirt & burr removal, air/water heat exchangers, air knife, electric heaters or tube firing burners.
TEMPERING Jet impingement heating, very high temperature uniformity during heating & soaking, rapid heat up feature, nitrogen atmosphere capability, steam tempering facility
CENTRAL PLANT CONTROL Advanced SCADA control system for plant Supervisory Control and Data Acquisition, production management, maintenance scheduling and data presentation in several formats. This user friendly facility can be viewed and supported through the internet.
EXTRAS Chiller tank (for ASI 52100 steel parts), post temper blackening tank and other customized features.