WO2018047017A1 - Method for monitoring the hardening process in an induction hardening machine - Google Patents
Method for monitoring the hardening process in an induction hardening machine Download PDFInfo
- Publication number
- WO2018047017A1 WO2018047017A1 PCT/IB2017/001512 IB2017001512W WO2018047017A1 WO 2018047017 A1 WO2018047017 A1 WO 2018047017A1 IB 2017001512 W IB2017001512 W IB 2017001512W WO 2018047017 A1 WO2018047017 A1 WO 2018047017A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inductor
- workpieces
- hardening
- machine
- cooling medium
- Prior art date
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- 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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the invention relates to a method for monitoring the hardening process in one
- DE 2 322 720 A shows a circuit arrangement for monitoring an induction hardening plant.
- the amount of heat supplied to the hardening plant is determined as electrical energy by switching the induction voltage and the induction current proportional voltages to a multiplier. Because the power supplied changes during the heating phase, it is integrated over the heating time.
- the output of the multiplier is connected to the input of an integrator.
- a disadvantage with controlled hardening devices is that certain errors, for example in the resonant circuit of the alternator, can not be detected because they are compensated by the control.
- Fig. 1 shows an induction hardening machine in a schematic representation
- Fig. 2 shows an inductor in an enlarged view
- FIG. 1 an induction hardening machine 1 is shown schematically.
- the workpiece 2 is rotationally driven in the working space 14 of the induction hardening machine 1 in a workpiece holding device consisting of a workpiece spindle 3 and a tailstock 4
- An inductor 5 is movably guided on a carriage 6 on a traveling column 7 in the vertical direction (Z-axis).
- the traveling column 7 is movable in the horizontal direction (X axis).
- the power supply is housed together with a machine control 9 a cabinet 8 and is connected via the high current cable 17 to the inductor 5.
- a spray nozzle 1 1 is arranged, from which quenching of the workpieces 2, a cooling medium 12 exits.
- the cooling medium 12 is collected in a collecting container 13 and conveyed from there with a pump 15 to the spray nozzle 1 1.
- the quality of the cooling medium 12 is checked continuously with a viscometer 14.
- the measured values determined in this case are transmitted via a connection (not shown) to the machine controller 9 and compared with reference values. So far it has been customary to control the viscosity by measuring the refractive index. However, this measuring method has the disadvantage that the proportion of polymer chains broken under the influence of light and heat can not be determined. The viscosity is advantageously measured in the viscometer 14 with the aid of ultrasound. This measuring procedure also provides information about the condition of the polymer chains.
- Heating can be measured at the inductor 5 Induktorfußschreib U s .
- This electrical characteristic is directly related to the directly generated magnetic flux and varies depending on the temperature of the workpiece. Different error factors, eg wrong material or loading with wrong
- a storage medium 18, preferably an RFI D chip is attached to the inductor 5.
- important performance data such as the remaining service life or pending maintenance intervals can be read out and buffered. If there are any tool defects or errors, the process no longer starts.
- information about manufacturing tolerances of the tool (inductor) can be given to adjust the axis if necessary independently.
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)
- General Induction Heating (AREA)
Abstract
The invention relates to a method for monitoring the hardening process in an induction hardening machine (1) comprising a machine control (9) and a writing/reading unit (16), a viscometer (14), wherein workpieces (2) are heated by an inductor (5) and are subsequently quenched by a cooling medium (12). The inductor (5) comprises a recording medium (18). Said method comprises the following steps: a) reading the recording medium (18) using the writing/reading unit (16) prior to the start of production and comparing the state data to the desired values; b) heating the workpieces (2) while simultaneously measuring the inductor foot voltage Us and comparing to the predetermined desired values; c) cooling the workpieces (2) using the cooling medium (12) whilst at the same time measuring the viscosity of the cooling medium (12) using the viscometer (14) and comparing to the predetermined desired values.
Description
Verfahren zum Überwachen des Härteprozesses in einer Induktionshärtemaschine Method for monitoring the hardening process in an induction hardening machine
Die Erfindung betrifft ein Verfahren zum Überwachen des Härteprozesses in einer The invention relates to a method for monitoring the hardening process in one
Induktionshärtemaschine nach dem Oberbegriff des Patentanspruchs 1. Bei solchen Härteanlagen werden Werkstücke mittels einer Induktionsspule erhitzt und anschließend abgeschreckt. Im Stand der Technik ist es bekannt, die Funktion einzelner Aggregate zu überwachen. Z.B. zeigt die DE 2 322 720 A eine Schaltungsanordnung zur Überwachung einer Induktionshärteanlage. Dabei wird die der Härteanlage zugeführte Wärmemenge als elektrische Energie ermittelt, indem der Induktionsspannung und dem Induktionsstrom proportionale Spannungen einem Multiplizierer aufgeschaltet werden. Weil die zugeführte Leistung sich während der Heizphase verändert, wird sie über die Aufheizzeit integriert. Zu diesem Zweck ist der Ausgang des Multiplizierers mit dem Eingang eines Integrators verbunden. Mit dem Ausgabewert der Schaltungsanordnung können unter anderem Induction hardening machine according to the preamble of claim 1. In such hardening equipment workpieces are heated by means of an induction coil and then quenched. In the prior art, it is known to monitor the function of individual units. For example, DE 2 322 720 A shows a circuit arrangement for monitoring an induction hardening plant. In this case, the amount of heat supplied to the hardening plant is determined as electrical energy by switching the induction voltage and the induction current proportional voltages to a multiplier. Because the power supplied changes during the heating phase, it is integrated over the heating time. For this purpose, the output of the multiplier is connected to the input of an integrator. With the output value of the circuit arrangement can inter alia
Rückschlüsse auf Härtetemperatur, Erwärmungstiefe oder auf den Wirkungsgrad desConclusions on hardening temperature, heating depth or on the efficiency of the
Induktors geschlossen werden. Ein Nachteil besteht bei geregelten Härteeinrichtungen darin, dass bestimmte Fehler, beispielsweise im Schwingkreis des Wechselstromgenerators, nicht detektiert werden können, weil sie von der Regelung kompensiert werden. Be closed inductor. A disadvantage with controlled hardening devices is that certain errors, for example in the resonant circuit of the alternator, can not be detected because they are compensated by the control.
Es ist die Aufgabe der vorliegenden Erfindung ein Verfahren zum vollumfänglichen It is the object of the present invention to provide a method for full-scale
Überwachen einer Induktionshärtemaschine aufzuzeigen, welche die Nachteile im Stand der Technik nicht aufweist. Monitoring an induction hardening machine show, which does not have the disadvantages in the prior art.
Diese Aufgabe wird gelöst mit einem Verfahren nach Patentanspruch 1. Vorteilhafte This object is achieved by a method according to claim 1. Advantageous
Weiterbildungen sind Gegenstand der Unteransprüche. Gemäß einem vorteilhaften Aspekt der Erfindung werden neben elektrisch und mechanisch ausgeführten Überwachungsmodulen zusätzlich überwacht: Further developments are the subject of the dependent claims. According to an advantageous aspect of the invention, in addition to electrically and mechanically executed monitoring modules are additionally monitored:
-die Induktorfußspannung the inductor foot stress
-die Art und der Zustand des Induktors -The type and condition of the inductor
-die Qualität des eingesetzten Abschreckmittels the quality of the quenching agent used
Mit einem derartigen Verfahren kann die Prozesssicherheit für Induktionshärtemaschinen deutlich verbessert werden. With such a method, the process reliability for induction hardening machines can be significantly improved.
Im Folgenden wird die Erfindung an Hand eines Ausführungsbeispiels beschrieben. In the following the invention will be described with reference to an embodiment.
Fig. 1 zeigt eine Induktionshärtemaschine in schematischer Darstellung Fig. 1 shows an induction hardening machine in a schematic representation
Fig. 2 zeigt einen Induktor in vergrößerter Darstellung Fig. 2 shows an inductor in an enlarged view
l
In Fig. 1 ist eine Induktionshärtemaschine 1 schematisch dargestellt. Das Werkstück 2 ist im Arbeitsraum 14 der Induktionshärtemaschine 1 in einer aus einer Werkstückspindel 3 und einem Reitstock 4 bestehenden Werkstückhaltevorrichtung rotatorisch antreibbar l In Fig. 1, an induction hardening machine 1 is shown schematically. The workpiece 2 is rotationally driven in the working space 14 of the induction hardening machine 1 in a workpiece holding device consisting of a workpiece spindle 3 and a tailstock 4
aufgenommen. Ein Induktor 5 ist auf einem Schlitten 6 an einem Fahrständer 7 in vertikaler Richtung (Z-Achse) beweglich geführt. Der Fahrständer 7 ist in horizontaler Richtung (X- Achse) verfahrbar. Die Stromversorgung ist zusammen mit einer Maschinensteuerung 9 einem Schaltschrank 8 untergebracht und ist über das Hochstromkabel 17 mit dem Induktor 5 verbunden. Oberhalb des Induktors 5 ist eine Sprühdüse 1 1 angeordnet, aus welcher beim Abschrecken der Werkstücke 2 ein Abkühlmedium 12 austritt. Das Abkühlmedium 12 wird in einem Auffangbehälter 13 aufgefangen und von dort mit einer Pumpe 15 zur Sprühdüse 1 1 gefördert. Die Qualität des Abkühlmediums 12 wird fortlaufend mit einem Viskosimeter 14 überprüft. Die dabei ermittelten Messwerte werden über eine nicht dargestellte Verbindung zur Maschinensteuerung 9 übertagen und mit Sollwerten verglichen. Bisher war es üblich die Viskosität durch Messen des Lichtbrechungsindex zu kontrollieren. Dieses Messverfahren hat jedoch den Nachteil, dass der Anteil an unter Licht- und Wärmeeinfluss zerbrochenen Polymerketten nicht ermittelt werden kann. Vorteilhaft wird die Viskosität im Viskosimeter 14 mit Hilfe von Ultraschall gemessen. Dieses Messverfahren gibt auch Aufschluss über den Zustand der Polymerketten. added. An inductor 5 is movably guided on a carriage 6 on a traveling column 7 in the vertical direction (Z-axis). The traveling column 7 is movable in the horizontal direction (X axis). The power supply is housed together with a machine control 9 a cabinet 8 and is connected via the high current cable 17 to the inductor 5. Above the inductor 5, a spray nozzle 1 1 is arranged, from which quenching of the workpieces 2, a cooling medium 12 exits. The cooling medium 12 is collected in a collecting container 13 and conveyed from there with a pump 15 to the spray nozzle 1 1. The quality of the cooling medium 12 is checked continuously with a viscometer 14. The measured values determined in this case are transmitted via a connection (not shown) to the machine controller 9 and compared with reference values. So far it has been customary to control the viscosity by measuring the refractive index. However, this measuring method has the disadvantage that the proportion of polymer chains broken under the influence of light and heat can not be determined. The viscosity is advantageously measured in the viscometer 14 with the aid of ultrasound. This measuring procedure also provides information about the condition of the polymer chains.
Die Fig. 2 zeigt einen Induktor 5 in vergrößerter Darstellung. Während der induktiven 2 shows an inductor 5 in an enlarged view. During the inductive
Erwärmung kann am Induktor 5 die Induktorfußspannung Us gemessen werden. Diese elektrische Kenngröße steht in direktem Zusammenhang mit dem unmittelbar erzeugten magnetischen Fluss und verändert sich in Abhängigkeit von der Temperatur des Werkstücks. Unterschiedliche Fehlerfaktoren, z.B. falscher Werkstoff oder Beladung mit falscher Heating can be measured at the inductor 5 Induktorfußspannung U s . This electrical characteristic is directly related to the directly generated magnetic flux and varies depending on the temperature of the workpiece. Different error factors, eg wrong material or loading with wrong
Werkstückgeometrie usw. haben direkten Einfluss auf das Magnetfeld des Induktors und können detektiert werden. Ferner ist am Induktor 5 ein Speichermedium 18, vorzugsweise ein RFI D-Chip angebracht. Darin sind z.B. Informationen über den Zustand des Werkzeugs enthalten, die vor Produktionsstart mit einer Schreib-Leseeinheit 16 in der Härtemaschine 1 ausgelesen werden. Ebenso können wichtige Leistungsdaten wie die verbleibende Standzeit oder anstehende Wartungsintervalle ausgelesen und zwischengespeichert werden. Bei etwaigen Werkzeugmängeln oder Fehlern startet der Prozess nicht mehr. Ebenso können Informationen über Fertigungstoleranzen des Werkzeugs (Induktor) mitgegeben werden um die Achse bei Bedarf selbständig nachzustellen. Nach Abschluss des Prozesses wird das Speichermedium 18 mit neuen Informationen beschrieben.
Bezugszeichenliste: Workpiece geometry etc. have a direct influence on the magnetic field of the inductor and can be detected. Furthermore, a storage medium 18, preferably an RFI D chip is attached to the inductor 5. This includes, for example, information about the state of the tool, which are read out before the start of production with a read-write unit 16 in the hardening machine 1. Likewise, important performance data such as the remaining service life or pending maintenance intervals can be read out and buffered. If there are any tool defects or errors, the process no longer starts. Likewise, information about manufacturing tolerances of the tool (inductor) can be given to adjust the axis if necessary independently. Upon completion of the process, the storage medium 18 will be described with new information. LIST OF REFERENCE NUMBERS
1 Induktionshärtemaschine1 induction hardening machine
2 Werkstück 2 workpiece
3 Werkstückspindel 4 Reitstock 3 Workpiece spindle 4 Tailstock
5 Induktor 5 inductor
6 Schlitten 6 sleds
7 Fahrständer 7 traveling stands
8 Schaltschrank 8 control cabinet
9 Maschinensteuerung 9 machine control
10 Arbeitsraum 10 working space
11 Sprühdüse 11 spray nozzle
12 Abkühlmedium 12 cooling medium
13 Auffangbehälter 14 Viskosimeter 13 collection container 14 viscometer
15 Pumpe 15 pump
16 Schreib- Leseeinheit 16 read-write unit
17 Hochstromkabel17 high current cables
18 Speichermedium
18 storage medium
Claims
1. Verfahren zum Überwachen des Härteprozesses in einer Induktionshärtemaschine (1 mit einer Maschinensteuerung (9) und einer Schreib- Leseeinheit (16), mit einem Viskosimeter (14) wobei Werkstücke (2) mit einem Induktor (5) erhitzt und anschließend mit einem Abkühlmedium (12) abgeschreckt werden, wobei der Induktor (5) ein Speichermedium (18) aufweist, A method of monitoring the hardening process in an induction hardening machine (1 comprising a machine control (9) and a writing-reading unit (16), with a viscometer (14) wherein workpieces (2) are heated with an inductor (5) and then with a cooling medium (12) are quenched, wherein the inductor (5) has a storage medium (18),
mit folgenden Verfahrensschritten: a. Auslesen des Speichermediums (18) mit der Schreib- Leseeinheit (16) vor Produktionsstart und Vergleich der Zustandsdaten mit Sollwerten b. Erwärmen der Werkstücke (2) bei gleichzeitigem Messen der with the following process steps: a. Reading out the storage medium (18) with the read-write unit (16) before starting production and comparing the status data with set values b. Heating the workpieces (2) while measuring the
Induktorfußspannung Us und vergleichen mit vorgegebenen Sollwerten c. Abkühlen der Werkstücke (2) mit dem Abkühlmedium (12) bei gleichzeitigem Messen der Viskosität des Abkühlmediums (12) mit dem Viskosimeter (14) und vergleichen mit vorgegebenen Sollwerten Induktorfußspannung U s and compare with predetermined setpoints c. Cooling the workpieces (2) with the cooling medium (12) while measuring the viscosity of the cooling medium (12) with the viscometer (14) and compare with predetermined setpoints
2. Verfahren nach Patentanspruch 1 , dadurch gekennzeichnet, dass die 2. The method according to claim 1, characterized in that the
Induktorfußspannung Us im Verfahrensschritt b. fortlaufend gemessen wird Induktorfußspannung U s in step b. is continuously measured
3. Verfahren nach Patentanspruch 1 , dadurch gekennzeichnet, dass die Viskosität im Verfahrensschritt c. fortlaufend gemessen wird 3. The method according to claim 1, characterized in that the viscosity in step c. is continuously measured
4. Verfahren nach einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet, dass das Speichermedium (18) nach dem Verfahrensschritt c. mit aktuellen Informationen beschrieben wird.
4. The method according to any one of the claims 1 to 3, characterized in that the storage medium (18) after the method step c. is described with current information.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016010888.6A DE102016010888A1 (en) | 2016-09-12 | 2016-09-12 | Method for monitoring the hardening process in an induction hardening machine |
| DE102016010888.6 | 2016-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018047017A1 true WO2018047017A1 (en) | 2018-03-15 |
Family
ID=60943050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2017/001512 WO2018047017A1 (en) | 2016-09-12 | 2017-09-14 | Method for monitoring the hardening process in an induction hardening machine |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102016010888A1 (en) |
| WO (1) | WO2018047017A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2322720A1 (en) | 1973-05-05 | 1974-11-21 | Volkswagenwerk Ag | Inductive hardening control circuit - multiplies induction current and voltage and integrates product |
| US5630957A (en) * | 1995-01-12 | 1997-05-20 | Adkins; Douglas R. | Control of power to an inductively heated part |
| DE10143652A1 (en) * | 2000-09-06 | 2002-04-25 | Volkswagen Ag | Induction hardening workpieces made from hardenable steel comprises inductively heating the workpiece, measuring the operating parameters of the induction hardening machine, and subsequently cooling |
| US20060213588A1 (en) * | 2005-03-23 | 2006-09-28 | Ntn Corporation | Induction heat treatment method, induction heat treatment installation and induction-heat-treated product |
| EP2407564A1 (en) * | 2009-03-12 | 2012-01-18 | Neturen Co., Ltd. | Management system for high frequency quenching |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3537513A1 (en) | 1985-10-22 | 1987-04-23 | Ema Elektromaschinen Schultze | Fully automatically operating induction hardening machine |
| US8447574B2 (en) | 2010-08-13 | 2013-05-21 | GM Global Technology Operations LLC | Method for simulating transient heat transfer and temperature distribution of aluminum castings during water quenching |
-
2016
- 2016-09-12 DE DE102016010888.6A patent/DE102016010888A1/en not_active Ceased
-
2017
- 2017-09-14 WO PCT/IB2017/001512 patent/WO2018047017A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2322720A1 (en) | 1973-05-05 | 1974-11-21 | Volkswagenwerk Ag | Inductive hardening control circuit - multiplies induction current and voltage and integrates product |
| US5630957A (en) * | 1995-01-12 | 1997-05-20 | Adkins; Douglas R. | Control of power to an inductively heated part |
| DE10143652A1 (en) * | 2000-09-06 | 2002-04-25 | Volkswagen Ag | Induction hardening workpieces made from hardenable steel comprises inductively heating the workpiece, measuring the operating parameters of the induction hardening machine, and subsequently cooling |
| US20060213588A1 (en) * | 2005-03-23 | 2006-09-28 | Ntn Corporation | Induction heat treatment method, induction heat treatment installation and induction-heat-treated product |
| EP2407564A1 (en) * | 2009-03-12 | 2012-01-18 | Neturen Co., Ltd. | Management system for high frequency quenching |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102016010888A1 (en) | 2018-03-15 |
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