DE955323C - Process for inductive surface hardening of camshafts - Google Patents

Process for inductive surface hardening of camshafts

Info

Publication number
DE955323C
DE955323C DEL14631A DEL0014631A DE955323C DE 955323 C DE955323 C DE 955323C DE L14631 A DEL14631 A DE L14631A DE L0014631 A DEL0014631 A DE L0014631A DE 955323 C DE955323 C DE 955323C
Authority
DE
Germany
Prior art keywords
heating
conductor loop
camshaft
heating conductor
camshafts
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.)
Expired
Application number
DEL14631A
Other languages
German (de)
Inventor
Dr-Ing Kurt Kegel
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DEL14631A priority Critical patent/DE955323C/en
Application granted granted Critical
Publication of DE955323C publication Critical patent/DE955323C/en
Expired 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts

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)

Description

Verfahren zum induktiven Oberflächenhärten von Nockenwellen Es ist bekannt, die Oberfläche einer Nockenwelle dadurch zu härten, daß diese durch eine mit hochfrequentem Wechselstrom gespeiste und die Nockenwelle umschließende, kreisförmig gebogene Heizleiterschleife im Drehvorschubverfahren hindurchgeführt und anschließend abgeschreckt wird. Der lichte Durchmesser der Heizleiterschleife wird dabei nur wenig größer gewählt als der Durchmesser der zylindrischen Teile der Nockenwelle, so daß jeweils die Kopplung zwischen Heizleiterschleife und Nockenspitze im Vergleich zu den übrigen.Teilen des Nockens verhältnismäßig eng ist. Das hat zur Folge, daß die Erhitzung im Gebiet der Nockenspitze wesentlich größer ist als an anderen Stellen des Nockens, womit die Gefahr einer Überhitzung der Nockenspitze verbunden ist. Diesen Nachteil will die Erfindung vermeiden.Process for inductive surface hardening of camshafts It is known to harden the surface of a camshaft by having it through a fed with high-frequency alternating current and encircling the camshaft, circular Curved heating conductor loop passed through in a rotary feed process and then is deterred. The clear diameter of the heating conductor loop is only chosen slightly larger than the diameter of the cylindrical parts of the camshaft, so that in each case the coupling between heating conductor loop and cam tip in comparison to the remaining parts of the cam is relatively narrow. This has the consequence that the heating in the area of the cam tip is much greater than in other places of the cam, with which there is a risk of overheating of the cam tip. The invention aims to avoid this disadvantage.

Auch bei dem erfindungsgemäßen Verfahren wird zum Zwecke der Erhitzung der zu härtenden Oberfläche von einer kreisförmig gebogenen Heizleiterschleife, die die Nockenwelle umschließt, Gebrauch gemacht. Im Gegensatz zu dem bekannten Verfahren wird jedoch das Werkstück nicht im Drehvorschub, sondern im geradlinigen Vorschub durch die Heizleiterschleife geführt. Gemäß der Erfindung wird dabei die Stellung der Nockenwelle in bezug auf die Heizleiterschleife so gewählt, daß die Spitzen der Nocken jeweils der Öffnung der Heizleiterschleife zugekehrt sind, an der die Zuführungen für den Hochfrequenzstrom und gegebenenfalls für das Kühlwasser angeordnet sind.In the method according to the invention, too, heating is used for the purpose the surface to be hardened by a circularly curved heating conductor loop, which encloses the camshaft, made use of. In contrast to the familiar However, the workpiece is not moved in a rotary feed, but in a straight line Feed guided through the heating conductor loop. According to the invention, the Position of the camshaft in with regard to the heating conductor loop like this chosen so that the tips of the cams each face the opening of the heating conductor loop where the leads for the high-frequency current and, if applicable, for the Cooling water are arranged.

Das neue Verfahren hat den Vorteil, daß die Nockenspitzen einer geringeren Erhitzung ausgesetzt werden, da sie sich jeweils an derjenigen Stelle des Heizleiters befinden, an der die Induktionswirkung am geringsten ist. Eine örtliche Überhitzung der Nockenwelle an den Spitzen der Nokken wird dadurch vermieden.The new method has the advantage that the cam tips are less They are exposed to heating because they are located at that point on the heatsealing band where the induction effect is lowest. Local overheating the camshaft at the tips of the cams is avoided.

Es ist an sich bekannt, örtliche Überhitzungen eines induktiv zu erwärmenden Werkstückes zu vermeiden. Zu diesem Zweck ist beispielsweise vorgeschlagen worden, zwischen dem Heizleiter und ,einem solchen Werkstück, dessen Querschnitt von der Heizleiterform abweicht, ein leitendes Zwischenstück anzuordnen, wobei Heizleiter und Werkstück von diesem Zwischenstück einen gewissen Abstand haben. Ein derartiges Verfahren cetzt jedoch voraus, daß für jeden, Werkstücksquerschnitt bzw. für jede Heizleiterform besondere Zwischenstücke angefertigt oder äuf Lager gehalten werden müssen. Demgegenüber verzichtet das Verfahren gemäß der Erfindung auf jedes zusätzliche Teil.It is known per se, local overheating of an inductive heating To avoid workpiece. For this purpose it has been proposed, for example, between the heating conductor and, such a workpiece, whose cross-section depends on the Heat conductor shape differs to arrange a conductive intermediate piece, with heat conductor and workpiece have a certain distance from this intermediate piece. Such a thing Method c assumes, however, that for each, workpiece cross-section or for each Heat conductor shape special spacers are made or kept in stock have to. In contrast, the method according to the invention dispenses with any additional Part.

Claims (1)

PATENTANSPRUCH: Verfahren zum induktiven Oberflächenhärten von Nockenwellen unter Verwendung einer mit hochfrequentem Wechselstrom gespeisten und die Nockenwelle umschließenden, kreisförmig gebogenen Heizleiterschleife, dadurch gekennzeichnet, daß die Nockenwelle zum Zwecke des Erhitzens derart im geradlinigen Vorschub durch die Heizleiterschleife geführt wird, daß die Spitzen der Nocken jeweils der Öffnung der Heizleiterschleife zugekehrt sind, an der die Zuführungen für den Hochfrequenzstrom und gegebenenfalls für das Kühlwasser angeordnet sind. In Betracht gezogene Druckschriften: Schweizerische Patentschrift Nr. 233 627; britische Patentschrift Nr. 485 65 r ; F. W. C u rt i s, High-frequency Induction Heating, 195o, S. 6, 7, 21, 81, 82, 83; Stahl und Eisen, 1943, S. 929 bis 965.Claim: A method for inductive surface hardening of camshafts using a circularly curved heating conductor loop which is fed with high-frequency alternating current and which surrounds the camshaft, characterized in that the camshaft is guided through the heating conductor loop in a straight forward feed for the purpose of heating in such a way that the tips of the cams are in each case facing the opening of the heating conductor loop on which the feed lines for the high-frequency current and possibly for the cooling water are arranged. Documents considered: Swiss Patent No. 233 627; British Patent No. 485 65r; FW C u rt is, High-frequency Induction Heating, 195o, pp. 6, 7, 21, 81, 82, 83; Stahl und Eisen, 1943, pp. 929 to 965.
DEL14631A 1953-02-10 1953-02-10 Process for inductive surface hardening of camshafts Expired DE955323C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL14631A DE955323C (en) 1953-02-10 1953-02-10 Process for inductive surface hardening of camshafts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL14631A DE955323C (en) 1953-02-10 1953-02-10 Process for inductive surface hardening of camshafts

Publications (1)

Publication Number Publication Date
DE955323C true DE955323C (en) 1957-01-03

Family

ID=7259873

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL14631A Expired DE955323C (en) 1953-02-10 1953-02-10 Process for inductive surface hardening of camshafts

Country Status (1)

Country Link
DE (1) DE955323C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485651A (en) * 1936-09-19 1938-05-19 Francis Stanislaus Denneen Improvements relating to surface hardening of metal articles
CH233627A (en) * 1943-06-23 1944-08-15 Patelhold Patentverwertung Method and device for surface hardening of cylindrical metal parts of different cross-sections by means of high-frequency induction currents.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485651A (en) * 1936-09-19 1938-05-19 Francis Stanislaus Denneen Improvements relating to surface hardening of metal articles
CH233627A (en) * 1943-06-23 1944-08-15 Patelhold Patentverwertung Method and device for surface hardening of cylindrical metal parts of different cross-sections by means of high-frequency induction currents.

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