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12 条记录 (耗时 0.019 秒)

    VERFAHREN UND VORRICHTUNG ZUM RANDSCHICHTHÄRTEN FORMKOMPLIZIERTER BAUTEILE
    5.
    发明公开
    VERFAHREN UND VORRICHTUNG ZUM RANDSCHICHTHÄRTEN FORMKOMPLIZIERTER BAUTEILE 审中-公开
    方法和设备表面硬化FORM复杂的部件

    公开(公告)号：EP2087141A1

    公开(公告)日：2009-08-12

    申请号：EP07818860.4

    申请日：2007-10-10

    申请人： Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V.

    发明人： BRENNER, Berndt ,  BONSS, Steffen ,  TIETZ, Frank ,  SEIFERT, Marko ,  HANNWEBER, Jan ,  KÜHN, Stefan ,  KARSUNKE, Udo

    IPC分类号： C21D1/09 ,  C21D10/00

    CPC分类号： C21D1/09 ,  C21D10/00 ,  C21D10/005 ,  C21D11/00

    摘要： The invention relates to the hardening of the surface layer of parts of machines, plants and apparatuses and also tools. Objects for which the application is possible and advantageous are components which are subjected to severe fatigue or wear stresses and are composed of hardenable steels and have a complicated shape and whose surface has to be hardened selectively on the functional surfaces or whose functional surface has a multidimensional shape. The process for hardening the surface layer of components having a complicated shape is carried out by means of a plurality of energy input zones. According to the invention, it is characterized in that the energy input zones are conducted on different curved parts separately in space and time and by means of cooperatively working transport systems so that superposition of the individual temperature fields forms a uniform temperature field which completely covers the functional surface of the component and within which each surface element of the later hardening zone of the component attains the selected austenite formation temperature interval ΔTa at least once and the time interval Δt between the maximum temperatures Tmaxn of the individual temperature fields is from 3.1 to 3.n smaller than the time ΔtmS which is required to go below the martensite start temperature MS during the cooling phase. The apparatus by means of which the process of the invention can be carried out is, according to the invention, characterized in that the energy configuring units are connected to one or more energy sources for optical or electromagnetic radiation and are each fixed to separate but cooperatively operating transport systems.

    VERSCHLEISSBESTÄNDIGE NOCKENWELLE UND VERFAHREN ZU IHRER HERSTELLUNG
    9.
    发明公开
    VERSCHLEISSBESTÄNDIGE NOCKENWELLE UND VERFAHREN ZU IHRER HERSTELLUNG 失效
    穿凸轮轴及其制造方法

    公开(公告)号：EP0925377A1

    公开(公告)日：1999-06-30

    申请号：EP97943775.0

    申请日：1997-09-12

    申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

    发明人： BRENNER, Berndt ,  WETZIG, Andreas ,  NAUNAPPER, Dietmar ,  DUSCHEK, Carsten

    IPC分类号： C21D1 ,  C21D5 ,  C21D9 ,  F01L1

    CPC分类号： F01L1/047 ,  C21D1/09 ,  C21D5/00 ,  C21D9/30 ,  C21D2211/007 ,  Y10S148/902

    摘要： The invention concerns a wear-resistant camshaft and a method of producing the same. Objects to which the invention is advantageously applicable include all cast-iron parts which are subject to wear as a result of lubricated friction. The wear-resistant camshaft consists of cast-iron and comprises a surface layer consisting of a ledeburitic recast layer with a high cementite portion and, lying therebelow, a martensitic hardening zone. According to the invention, the recast layer consists of finely dispersed ledeburitic cementite with thicknesses of ≤ 0.1 νm and a metallic matrix comprising a phase mixture of martensite and/or bainite, residual austenite and less than 20 % finely laminated perlite with a distance of ≤ 0.1 νm between the laminations. The hardening layer is formed from a phase mixture of martensite and/or bainite, partially dissolved perlite and residual austenite. This wear-resistant camshaft according to the invention is produced by means of a high-energy surface recasting method.