Abstract:
The invention relates to a method for producing a piston (10, 110, 210) for an internal combustion engine, characterized by the following steps: a) producing an upper piston part (11, 111, 211) having at least one joining surface (21, 22; 121, 122), b) producing a lower piston part (12, 112, 212) having at least one joining surface (23, 24; 123, 124), c) establishing a direct contact between the at least one joining surface (21, 22; 121, 122) of the upper piston part (11, 111, 211) and the at least one joining surface (23, 24; 123, 124) of the lower piston part (12, 112, 212), d) heating the upper piston part (11, 111, 211) and the lower piston part (12, 112, 212) in the region of the joining surfaces (21, 23; 22, 24; 121, 123; 122, 124) brought in direct contact by induction or by a direct current flow through the joining surfaces (21, 23; 22, 24; 121, 123; 122, 124), and (e) connecting the upper piston part (11, 111, 211) and the lower piston part (12, 112, 212) to form a piston (10, 110, 210) by means of a pressing process and optionally finishing the piston (10, 110, 210).
Abstract:
The invention relates to a method for producing a piston (1) of an internal combustion engine, designed as a one-piece cooling channel piston. The piston (1) comprises an upper part (2) and a lower part (3) supported by corresponding circumferential joining bosses (11, 12) together forming a joining zone (4). In order to produce a bonded joint of the upper part (2) and the lower part (3), the joining bosses (11, 12) are connected by means of multiorbital friction welding in the region of a rotationally symmetrical or rotationally asymmetrical joining zone (4).
Abstract:
The invention relates to a cooling channel piston (1) for an internal combustion engine, comprising a piston bottom (2) and a piston shaft (3) that is joined thereto by means of a friction welding process, the piston bottom (2) and the piston shaft (3) jointly forming a cooling channel (8). According to the invention, an annular wall (13) which radially delimits the cooling channel (8) towards the outside is formed by the piston bottom (2) and/or the piston shaft (3). Said annular wall (13) can be sealed using a welding process once the piston bottom (2) and the piston shaft (3) have been joined together.
Abstract:
Verfahren zur Herstellung eines Schwenkaggregats mit einem rohrförmigen Gehäuse und einer darin schwenkbar gelagerten Welle als Grundbauteile, wobei eine axial verlaufenden Rippe auf einer Innenwandung des Gehäuses und/oder einer äußere Mantelfläche der Welle mittels einer stoffschlüssige Verbindung fixiert wird, wobei an dem Grundbauteil eine in Umfangsrichtung kontinuierlich verlaufende Oberfläche hergestellt wird und die Rippe an mindestens einem der Grundbauteile aufgesetzt und festgelötet wird.
Abstract:
Die Erfindung betrifft eine Vorrichtung (1) zur Belichtung von Zylinderlaufbahnen (2) von Kolbenmaschinen mit einer in einen Zylinder (3-6) einführbaren Optik-Einrichtung (10-13), die zur Belichtung der Zylinderlaufbahn (2) mittels eines Laserstrahles (17) einer Lasereinrichtung höhenverstellbar sowie vorzugsweise um eine Rotationsachse drehbar ausgebildet ist, wobei die Belichtungsvorrichtung (1) mehrere voneinander beabstandete, höhenverstellbare und vorzugsweise um eine Rotationsachse drehbare Optik-Einrichtungen (10,11,12,13) aufweist.
Abstract:
A piston is manufactured with functional recesses (6, 7, 8) thereof formed from property improving material (18b, 18c, 18d). A blank (10) defines a mounting recess (12, 14, 16) and a quantity of said property-improving material (18b, 18c, 18d) is secured within said mounting recess. Said functional recess (6, 7, 8) is machined out of said quantity of property-improving material. The process for securing said property-improving material (18b, 18c, 18d) comprises forming a rod (20, 22, 34) from a material which on plasticisation under heat and pressure forms said property-improving material, inserting an end of the rod into said mounting recess, and rotating said rod in contact with a surface of the mounting recess (12, 14, 16), while applying force to the rod to feed it into the mounting recess. The rotational speed of said rod and the force applied thereto being controlled so that frictional heat is generated between the rod and the blank, causing plasticisation of the material of the rod, thereby, upon solidification converting it into said property-improving material (18b, 18c, 18d).