Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Other

Siemens Aktiengesellschaft

Steffen Bonss

Berndt Brenner

Hans-Joachim Scheibe

Holger Ziegele

Jan Hannweber

Eckhard Beyer

Jens Standfuss

Stefan Kuehn

Frank Tietz

Stefan Braun

Marko Seifert

Georg Dietrich

Udo Karsunke

Stefan KÜHN

Jörg Kaspar

David Walter

The invention relates to reflective optical elements for a dynamic deflection of a laser beam and to a manufacturing method for these reflective elements. It is the object of the invention to provide reflective optical elements for a dynamic deflection of laser beams which can be manufactured less expensively and which are flexible in their geometrical design so that they achieve improved properties in dynamic operation. In the reflective optical element in accordance with the invention, a surface of a base body and a plate-shaped reflective element are connected to one another in a planar manner and with material continuity by means of a solder connection.

Reflective optical element for a dynamic deflection of a laser beam and method for manufacture thereof

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 &#x394;Tat least once and the time interval &#x394;t between the maximum temperatures Tof the individual temperature fields is from 3.1 to 3.n smaller than the time &#x394;twhich 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.

Process and apparatus for hardening the surface layer of components having a complicated shape

The invention relates to a method and a device for laser-beam welding, because the invention is especially suitable for deep welding a wide variety of materials. The object of the invention is to weld a wide variety of materials by means of laser radiation, especially by deep welding, with a reduced amount of work and at the same time good quality of the welded joint produced. The procedure adopted for this according to the invention is that the intensity of the laser radiation is set by beam-shaping in and on the surface of workpieces in such a way that a small area in the workpiece is irradiated with a great intensity, to form a steam capillary there, and a further, larger adjacent area on the workpiece surface is irradiated with a lesser intensity, and as a result a bell-shaped opening of the steam capillary is formed on the workpiece surface and the cooling rate of the melted material is reduced.

Method and device for laser beam welding

The invention relates to a wear-resistant, highly stressed and low-friction boundary coating construction for titanium or the alloys thereof which can be advantageously used in order to protect human implants. According to the inventive boundary coating construction the boundary coating is comprised of a 200 to 400 nm thick DLC coating ( ), a 5 to 50 nm thick intermediate coating ( ) and a 0.3 to 2.0 mm thick gas alloyed coating ( ), said gas alloyed coating having a hardness between 600 HV and 1,400 HV . The inventive boundary coating construction is produced by firstly melting the surface of the member which is to be protected. The surface is then gas alloyed and cleaned in an N /Ar atmosphere. Subsequently, the intermediate coating is first deposited followed by a depositing of the hard amorphous carbon coating by means of the laser-induced, pulsed vacuum arc (laser-arc) method.

Wear-resistant, mechanically highly stressed and low-friction boundary coating construction for titanium or the alloys thereof and a method for producing the same

Wear-resistant edge layer for titanium and its alloys which can be subjected to high loads and has a low coefficient of friction. The wear-resistant edge layer includes a hard amorphous carbon layer, an intermediate layer, and a laser gas alloyed layer. The wear-resistant edge layer may include a 200 to 400 nm thick hard amorphous carbon layer, a 50 to 200 nm thick intermediate layer, and a 0.3 to 2.0 mm thick laser gas alloyed layer. The laser gas alloyed layer may include precipitated titanium nitride needles and have a hardness between 600 HV0.1 and 1400 HV0.1. Process for producing a wear resistant edge layer on a substrate. The process includes forming a laser gas alloyed layer by melting a surface of a substrate, applying an intermediate layer by Laser-Arc, and depositing a hard amorphous carbon layer on the intermediate layer by Laser-Arc.

Wear-resistance edge layer structure for titanium or its alloys which can be subjected to a high mechanical load and has a low coefficient of friction, and method of producing the same

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Zella-Mehlis, Germany

Steffen Bonss