EP0484359A1 - Procede et dispositifs pour commander des processus de traitement thermique de metaux en fonction de la matiere. - Google Patents

Procede et dispositifs pour commander des processus de traitement thermique de metaux en fonction de la matiere.

Info

Publication number
EP0484359A1
EP0484359A1 EP90910724A EP90910724A EP0484359A1 EP 0484359 A1 EP0484359 A1 EP 0484359A1 EP 90910724 A EP90910724 A EP 90910724A EP 90910724 A EP90910724 A EP 90910724A EP 0484359 A1 EP0484359 A1 EP 0484359A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
result
parameters
heat treatment
material properties
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90910724A
Other languages
German (de)
English (en)
Other versions
EP0484359B1 (fr
Inventor
Paul Braisch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gattermeier Helmut Dipl-Ing
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0484359A1 publication Critical patent/EP0484359A1/fr
Application granted granted Critical
Publication of EP0484359B1 publication Critical patent/EP0484359B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • the invention relates to a method for the material-dependent control of
  • Heat treatment processes of metals in the case of inductive heating in a closed control loop if the machining result is otherwise influenced by predetermined and precisely reproduced machine parameters by the material properties which are subject to a random change, in particular by random changes in the metallurgical conversion behavior, the electrical or magnetic properties and the like, and a device to carry out the procedure.
  • Origin e.g. from the same casting batch, rolling batch,
  • Blacksmith batch, etc. are sluiced through the manufacturing.
  • the object of the invention is, based on the prior art shown, to specify a method which controls the process of inductive heat treatment in such a way that the treatment result in a series production, despite a random change in any material properties, does not, or only in spreads narrow limits.
  • Heating speed
  • the type of structure or the distribution of carbon at the start of the process determine the further process flow.
  • Determination 9 of the required extent of the compensatory control with a view to achieving the desired result is made by means of the empirical
  • said analysis refers to a known process sequence, which corresponds to a known material condition and a known processing result.
  • both said analysis and said control are carried out in arbitrarily short periods of time, in each case alternately, from the beginning of the process to the end of the process, and thus all the requirements for establishing a closed control loop are met.
  • the invention further relates to a device for performing this method.
  • the reference number 3 designates a body that with
  • an induction loop 5 With the help of an induction loop 5 in whole or in parts, it is brought to the austenitizing temperature, e.g. to then be quenched or hardened.
  • the induction loop 5 is one
  • the supply current and supply voltage are determined using the 5 voltage converter 1 and the
  • Stro converter 2 measured.
  • the corresponding measurement signals are recorded by a multi-channel transducer 6 and for further processing to one of the
  • the basic function of the temporal function P (t) calculated by the computer 7 is in
  • Fig. 2 shown.
  • the computer 13 analyzes the function
  • the aim of this analysis is, according to the invention, to identify characteristic differences in the course of the two functions P ⁇ (t) and P ⁇ (t) on the basis of certain criteria and to assign these to certain factors influencing the process of inductive heat treatment, for example changing the hardenability properties of the heated material, Change in the inductor state, etc. • • • •
  • the computer 7 then calculates the amount of the printout
  • the latter can be avoided by correcting the process sequence or the original manipulated variable 5 (i) from the time tA i) by the amount Delta S (i), FIG. 3.
  • the computer 7 calculates the correction amount Delta S (i) from an equation of form
  • a corresponding correction signal is forwarded from the computer 7 to the frequency converter 4 via the controller 8, namely in such a way that the parameter determining the process sequence changes from time t ⁇ i) compared to an uncorrected situation P (i) according to P (corr, i) runs and thus, despite the accidentally occurring deviation in the material properties, the hardness result is kept according to the invention within the specified tolerances.
  • Equation (3) takes into account the specific metallurgical, thermal and geometric conditions of a given application.
  • the determination equation (3) can be determined empirically in a simple manner. For this, e.g. the simple approach
  • g in approach (4) is successively changed so that the difference (5) tends towards zero.
  • the value of g determined empirically in this way is then adopted in the relationship (4) used for the material-dependent process control or process correction in series production.
  • Delta S (i) k. (L - kappa (i)) used to calculate the correction of the manipulated variable S (i) (FIG. 3).
  • the size k is determined in the same way as already described for g.
  • the computer 7 now determines the instantaneous values pairs (U i (tu), I ⁇ (tu)) and (U ⁇ (tu), Ij_ (tu)) and the relationships therefrom for the time tu
  • Zeta (i) (ZU) - Z (b)) / Z (b) can be quantitatively and adjusted for the influence of the material, the change in the inductor state can be recorded and used for a possibly necessary correction of the manipulated variable S (i) .
  • Such a correction Delta S (i), Fig. 3, is carried out in principle in the same way as already explained in connection with (4) and (8), but already at the beginning of the controlled cycle and considerably before the corresponding times t ⁇ ( b) or t ⁇ (i) in Fig. 2, namely at the time

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)
  • Control Of Heat Treatment Processes (AREA)
  • General Induction Heating (AREA)

Abstract

Ce procédé sert à commander des processus de traitement thermique de métaux en fonction de la matière pendant le chauffage inductif dans un circuit de régulation fermé, lorsque même avec des paramètres machine prédéterminés et reproduits avec précision, le résultat du traitement est affecté par les caractéristiques matière soumises à une variation aléatoire. Ceci peut se produire notamment par suite d'une variation aléatoire du comportement de transformation métallurgique, des caractéristiques électriques ou magnétiques et de ce genre. La variation des paramètres de commande du processus (température, puissance thermique et variables similaires) dans le temps est analysée en temps réel et en relation à l'écart par rapport à une fonction prédéterminée. Les caractéristiques matière qui varient sont dérivées du résultat. Toute correction nécessaire de ces paramètres de commande s'effectue pendant le cycle de travail courant, de sorte que chaque variation aléatoire des caractéristiques matière est compensée et que son influence sur le résultat du traitement est limitée.
EP90910724A 1989-07-28 1990-07-26 Procede et dispositifs pour commander des processus de traitement thermique de metaux en fonction de la matiere Expired - Lifetime EP0484359B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3925047A DE3925047A1 (de) 1989-07-28 1989-07-28 Verfahren zur werkstoffabhaengigen steuerung von waermebehandlungsprozessen von metallen und vorrichtung zur durchfuehrung des verfahrens
DE3925047 1989-07-28
PCT/EP1990/001225 WO1991002096A1 (fr) 1989-07-28 1990-07-26 Procede et dispositifs pour commander des processus de traitement thermique de metaux en fonction de la matiere

Publications (2)

Publication Number Publication Date
EP0484359A1 true EP0484359A1 (fr) 1992-05-13
EP0484359B1 EP0484359B1 (fr) 1994-10-12

Family

ID=6386057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90910724A Expired - Lifetime EP0484359B1 (fr) 1989-07-28 1990-07-26 Procede et dispositifs pour commander des processus de traitement thermique de metaux en fonction de la matiere

Country Status (3)

Country Link
EP (1) EP0484359B1 (fr)
DE (2) DE3925047A1 (fr)
WO (1) WO1991002096A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2081055C (fr) * 1991-11-05 1999-12-21 John R. Eppeland Methode et appareil de traitement thermique de pieces de metal par rayonnement infrarouge
DE4141039A1 (de) * 1991-12-13 1993-06-17 Datz Alexander Messdatenerfassungsgeraet
DE4301754C2 (de) * 1993-01-23 1994-10-20 Rexnord Kette Gmbh & Co Kg Verfahren zum Herstellen von warmgewalztem Stahlband mit eingestellter Festigkeit
US5698082A (en) * 1993-08-04 1997-12-16 Balzers Und Leybold Method and apparatus for coating substrates in a vacuum chamber, with a system for the detection and suppression of undesirable arcing
DE4326100B4 (de) * 1993-08-04 2006-03-23 Unaxis Deutschland Holding Gmbh Verfahren und Vorrichtung zum Beschichten von Substraten in einer Vakuumkammer, mit einer Einrichtung zur Erkennung und Unterdrückung von unerwünschten Lichtbögen
AT408623B (de) * 1996-10-30 2002-01-25 Voest Alpine Ind Anlagen Verfahren zur überwachung und steuerung der qualität von walzprodukten aus warmwalzprozessen
DE19948843C2 (de) * 1999-10-07 2002-02-07 Klaus Siegert Verfahren und Vorrichtung zur Ermittlung des teilflüssigen Gefügezustandes beim induktiven Erwärmen von Werkstücken
DE19961452C1 (de) * 1999-12-20 2001-02-01 Induktionserwaermung Fritz Due Verfahren und Vorrichtung zum Oberflächenvergüten metallischer Werkstücke durch induktive Wärmebehandlung
DE10047492A1 (de) * 2000-09-26 2002-04-25 Schweistechnische Lehr Und Ver Verfahren und Vorrichtung zum Schweißen metallischer Werkstoffe mit induktiver Vorwärmung
US7605592B2 (en) 2003-03-12 2009-10-20 Siemens Aktiengesellschaft Laminated core testing device
DE102005054316B3 (de) * 2005-04-28 2006-10-19 Universität Stuttgart Verfahren und Vorrichtung zur Ermittlung des Gefügezustandes eines metallischen Werkstückes bei der Erwärmung
ES2310960B1 (es) * 2006-11-08 2009-11-05 Bsh Electrodomesticos España S.A. Circuito de dispositivo de calentamiento.
DE102019212171A1 (de) * 2019-08-14 2021-02-18 Robert Bosch Gmbh Verfahren und Vorrichtung zum Optimieren eines induktiven Wärmebehandlungsprozesses mithilfe eines Bayes'schen Optimierungsprozesses
CN113434988B (zh) * 2021-06-11 2022-10-28 西安交通大学 一种核动力系统中热管的传热特性分析方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192294A (en) * 1986-06-30 1988-01-06 Electricity Council Method of heating
US4798925A (en) * 1986-07-04 1989-01-17 Kabushiki Kaisha Meidensha Method for measuring effective heating power for high frequency heating
US4816633A (en) * 1987-03-06 1989-03-28 Tocco, Inc. Method of monitoring induction heating cycle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9102096A1 *

Also Published As

Publication number Publication date
DE59007464D1 (de) 1994-11-17
DE3925047A1 (de) 1991-01-31
WO1991002096A1 (fr) 1991-02-21
EP0484359B1 (fr) 1994-10-12

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