Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D11/00—Process control or regulation for heat treatments
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material

Definitions

• the present invention relates to a heat treatment system for parts of any shape, preferably parts for the mechanical industry such as in particular parts for the automotive industry.
• French patent 87 13 217 filed on September 24, 1987 by the present holder also describes an automatic installation of fast thermochemical treatment of a load made up of parts intended in particular for the mechanical industry, which includes a plurality of treatment modules such as in particular induction preheating module, thermochemical processing modules, quenching module, a means for loading and unloading of the pieces stacked in columns and a means for transferring said columns of pieces between the different processing modules.
• treatment modules such as in particular induction preheating module, thermochemical processing modules, quenching module, a means for loading and unloading of the pieces stacked in columns and a means for transferring said columns of pieces between the different processing modules.
• the present invention proposes to apply the installations described above to treatments of parts in particular of mechanical parts, with a view to obtaining the results mentioned above, these treatments being characterized by the following operations: heating , temperature maintenance and controlled cooling.
• This treatment may include degassing. Indeed, even if the surface of the product is free of deposits, it may contain adsorbed gaseous species and by raising the temperature, placing under vacuum and maintaining under vacuum for a sufficient time, it is possible to impartially reduce the content of these gaseous species in the product finally obtained;
• Degreasing can also be carried out, which can be carried out by means of rapid heating under a gaseous stream of hydrogen and water vapor.
• the treatments relating to the maintenance of the surface condition of the treated parts may include other operations such as blueing, etc.
• the invention therefore proposes to carry out operations which make it possible to avoid these drawbacks in order to maintain the dimensional stability of the parts treated.
• These treatments can be as follows:
• This treatment essentially comprises a softening annealing.
• the different types of treatment which have just been mentioned in order to maintain the quality of the products which are to be or have undergone heat treatment essentially comprise three types of operation: heating, temperature maintenance and controlled cooling, which, according to the invention, are carried out on an installation of the type described in the patent applications cited above.
• the heating necessary for annealing or tempering can be carried out in the induction heating chambers provided in these installations or in one or more treatment chambers in the case of specific temperature cycles.
• thermochemical treatment chambers if the maintenance takes place at a temperature at which the ferrite is transformed into austenite during heating
• the cooling can be carried out either in the quenching chamber, or by convection, by radiation alone or using a neutral gas at a suitable temperature or by any other suitable means.
• thermochemical treatment When the treatment is preliminary or consecutive to the thermochemical treatment, it can be carried out directly and automatically in the installation without it being necessary to carry out a removal of the parts from the latter.
• all of the processing is carried out automatically using appropriate software, the automaton thus programmed managing the following cycles:
• the invention makes it possible to simultaneously carry out, using the same installation and alternatively, carburizing treatments (appropriate temperature and atmosphere), annealing and / or degreasing-degassing, the management of the installation managing two or more different cycles.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Heat Treatment Of Articles (AREA)
• Furnace Details (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9373471

Family Applications (1)

Country Status (11)

Families Citing this family (2)

Citations (5)

• 1988
  • 1988-12-27 FR FR8817245A patent/FR2640999A1/fr active Pending
• 1989
  • 1989-12-06 CA CA002004761A patent/CA2004761A1/fr not_active Abandoned
  • 1989-12-22 EP EP89403635A patent/EP0376832A1/fr not_active Withdrawn
  • 1989-12-22 DE DE198989403635T patent/DE376832T1/de active Pending
  • 1989-12-22 WO PCT/FR1989/000675 patent/WO1990007583A1/fr not_active Ceased
  • 1989-12-22 KR KR1019900701898A patent/KR910700358A/ko not_active Withdrawn
  • 1989-12-22 JP JP2501754A patent/JPH03503187A/ja active Pending
  • 1989-12-22 ES ES89403635T patent/ES2016785A4/es active Pending
  • 1989-12-22 DD DD89336256A patent/DD290665A5/de not_active IP Right Cessation
  • 1989-12-26 CN CN89109569A patent/CN1043958A/zh active Pending
• 1991
  • 1991-09-27 GR GR90300153T patent/GR900300153T1/el unknown

Patent Citations (5)

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