The invention relates to a low alloyed steel comprising the following alloy components: - 0.3 - 0.50 wt.% carbon; preferably 0.35 - 0.4 wt.% C, - 2.0 - 5.0 wt.% silicon; preferably 2.5 - 4 wt.% Si, - 2.0 - 9.0 wt.% Cr, preferably 3.0 - 7 wt.% and more particularly 4 - 6 wt.% Cr, the remainder being iron and up to 0.5 wt.% impurities, and to the thus produced components.
The invention relates to a one-piece forged cooling channel piston for an internal combustion engine, having a forged piston head 1 with a combustion trough 3 in the piston crown 2, an annular wall 4 with an annular part 11 and a peripheral closed cooling channel 7 at the height of the annular part 11, wherein a piston skirt 9 is forged on the piston upper part 1 and the cooling channel 7 is defined by a cooling channel inner wall which is forged as one piece, and flanged outwards partially to form a piston crown portion, the outer end of which cooling channel inner wall lies on an annular wall 4 which is forged as one piece out of the piston upper part. The invention further relates to a method for the production of such a piston.
The invention relates to a reshaped bush-like part, which has a base (10), a wall (30), which adjoins the base, is integral therewith and comprises a wall portion of reduced outside diameter (32) and an opening portion (20), wherein the wall (30) is cold-hardened and has a grain flow substantially parallel to the outer contour, and relates to a method for the production thereof and to a device for the production of a bush.
The invention relates to a method for producing a friction-welded metal part having a shaft and at least one outer part, which is fastened to the shaft and has a greater diameter than the shaft and properties different from the shaft, comprising the steps of providing a blank for the outer part (1) having a round opening (5); providing a rod-like shaft blank (2) having an end section (6) that has a diameter greater than the inner diameter of the round opening (5) and that is centered with respect to the round opening; friction welding the end section (6) of the rod-like shaft blank (2) to the outer-part blank (1) in order to form a weld bead (4) by pushing the end section (6)into the opening (5), wherein the opening is expanded by means of the friction welding, until the end section hits the end of the round opening (5) and a welded-on outer part is formed on the outer part (1), wherein the weld extends conically in the outer part and the outer part surrounds the shaft blank; and shaping the blank thus produced in order to produce an outer-part contour by means of a method selected from among the following group: forging, upsetting, electric upsetting, extruding - all of the methods mentioned in the cold, warm, or hot temperature range. The invention further relates to a part produced according to said method.
B23K 20/12 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by frictionFriction welding
5.
METHOD FOR THE PRODUCTION OF A FORGED PART, FORGED PART, AND FORGING DIE
The invention relates to the production of a forged part (11) having at least one unilateral extension (8), particularly a segment shaft, wherein round material is pressed to a blank (10) having unilaterally accumulating material in a first mold (7) by lateral extrusion, and is subsequently forged in a forging die (15), wherein a favorable fiber orientation is obtained. The invention also relates to a forged part, and to a forging die.
The invention relates to a method for producing a rotationally symmetrical hollow metal part, particularly a shaft. According to said method, bar-shaped ductile solid material is provided, the solid material is heated from about 300 °C below the forging temperature to the forging temperature, the solid material is transversally spline-rolled until weakenings are created in the core zone (3) of the solid material and the sold material is torn open. Two mandrels (5, 6) are guidingly introduced into the center of the bar-shaped solid material during the rolling process, and one mandrel is retracted while the second mandrel continues advancing so as to produce a tubular part. Also disclosed is a transversally spline-rolled rotationally symmetrical hollow part, especially a shaft, which is produced according to said method and can be embodied as a transmission shaft, camshaft, drive shaft, output shaft, starter shaft, hollow shaft, or a preform for molded parts and similar.
A method for friction-welding a first part (1) to a second part (2) is disclosed. A joint surface (3) on the first part (1) for friction-welding is arranged together with a joint surface (3) on the second part (2) for friction-welding such as to form an incomplete contact surface and the first and second part (1, 2) are friction welded together to form a welded joint.
B23K 20/12 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by frictionFriction welding
B23K 33/00 - Specially-profiled edge portions of workpieces for making soldering or welding connectionsFilling the seams formed thereby
B23K 37/06 - Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for positioning the molten material, e.g. confining it to a desired area
B23P 15/10 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
The invention relates to a device for forging bush-shaped parts, comprising a form with: an upper form mandrel (C); an outer form ring (A); a lower form mandrel (B); an ejector device with an upper ejector (G) for ejection through the upper form mandrel (C); a lower ejector (H) for ejection through the lower form mandrel (B), optional support devices for the form comprising a: lower reinforcement ring (D) for the lower region of the outer form ring (A) and a form mandrel housing (F) for the upper region of the outer form ring (A) and a clamping base (E) to support the lower form mandrel (B), by means of which a lower ejector (H) may be operated.
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