Abstract: A mold forming tool for use in the manufacture of casting molds by compression of loose mold forming material by a process in which the final compacting is achieved by pressing, for the casting of cast pieces having undercuts, the tool having an elastically deformable portion in the region of the undercuts, and the elastically deformable portion being made of a material which is deformable, thus creating the undercut pattern, solely under the influence of the pressure exerted on the mold forming material during the final compacting.

Abstract: A porous soft material sealing gasket comprising an asbestos fiber web with a multiplicity of perforations. The perforated web is impregnated with an impregnating agent that at least partially fills the free pores of the web by penetrating through the perforations.

Abstract: For the out-of-round shaping of workpieces, subsequent to the circumferential machining of a first workpiece or workpiece stack, the actual contour thereof is traced, then compared with the predetermined desired contour and the obtained deviations between the desired contour and actual contour are used for the correction of the desired contour for further machining.

Abstract: A cross-sectionally U-shaped radially inwardly open piston ring for a piston slidably received in a cylinder and dividing the cylinder into a high-pressure side and a low-pressure side. The piston ring includes first and second radially inwardly projecting, circumferentially extending legs for being received in respective grooves of the piston, while straddling a radially outwardly projecting, circumferentially extending web forming part of the piston. That leg which is closer to the high-pressure side than the other leg when the piston ring is in place on the piston, is resiliently deformable in a direction parallel to the axis of the piston in response to pressures prevailing at the high-pressure side, whereby the leg is circumferentially pressed against the web forming part of the piston.

Abstract: In a gasket made of a fibrous and/or porous material impregnated with a polymerizable saturating agent which is partially polymerized only to a plastically deformable consistency, an additive which prevents complete polymerization and hardening is applied to the surfaces of the gasket after impregnation with the saturating agent and partial polymerization.

Abstract: A sintered valve seat ring having excellent resistance to wear, to corrosion and to thermal stresses, and a method for its production. The ring comprises a supporting portion made up of an iron or steel alloy and a facing portion, subject to wear, of a cobalt and/or nickel alloy. The supporting portion comprises up to 30% by weight of the alloy of the facing portion.

Abstract: A flat gasket has at least one opening and a metal frame surrounding the opening and attached to a gasket edge defining the opening. The frame has rims on both sides of the gasket and metal overlays arranged adjacent the frame in a face-to-face relationship with the gasket on both sides thereof. Each overlay is formed as a flap-like extension of the rims on both sides of the gasket along a linear length portion of the frame.

Abstract: Piston rings of asymmetrical cross section are identified by providing a surface marking which extends from one flank face of the piston ring to the outer circumferential face (running face) thereof.

Abstract: An arrangement for orienting an out-of-round workpiece into desired angular and lateral positions for a machining operation. The arrangement places the workpiece into a first location; determines the actual angular and lateral positions of the workpiece in the first location; determines the deviations between the respective desired and actual positions; moves the workpiece from the first location into a second location; and reorients the workpiece into the desired angular and lateral positions dependent upon correctional values derived from the above-noted deviations.

Abstract: An apparatus for lapping an external circumferential arcuate face of a workpiece includes an axially split, radially resiliently expandable sleeve having an inner face constituting a lapping surface, an axial clamping arrangement for immobilizing the sleeve in a radially resiliently expanded condition. The apparatus has an operative state in which the sleeve is immobilized by the clamping arrangement in the radially resiliently expanded condition in which the inner diameter of the sleeve corresponds to a desired working diameter of the apparatus.

Abstract: A workpiece holder for the centered holding of annular workpieces, for working one of the circumferential faces of the workpieces, the holder including a basic element having a generally cylindrical support surface, a plurality of segments which are distributed around the circumference of the cylindrical support surface for radially clamping the workpieces individually, and an elastic support member connecting the segments to the basic element.

Abstract: A wear-, corrosion-, heat-, and abrasion-resistant sintered body is prepared from a metallic powder mixture of from about 95 to 99.5% of a base alloy powder and about 0.5 to 5% of an additive alloy powder, wherein the additive alloy has a melting point which is lower than the melting point of the base alloy such that when pressed and sintered at a temperature above the melting point of the additive alloy and below the melting point of the base alloy a sintered body is produced having a density of at least 95% of the theoretical density.

Abstract: In order to inoculate or refine a metal by introducing an additive into a melt of the metal under high kinetic energy, the additive is placed in molten form for introduction into the melt.

Abstract: A sealing gasket has at least one framed throughgoing opening; the frame is formed of at least two superposed bent sheet metal border flanges which have a U-shaped cross section and which have legs of unlike lengths. The border flanges fully overlap the soft material of the gasket without forming an appreciable hollow space underneath the legs.

Abstract: A method and apparatus for circumferentially machining an out-of-round workpiece in which the workpiece is rotated about its longitudinal axis at an irregular angular speed.

Abstract: Apparatus for positioning a workpiece, such as a piston ring, which has an out-of-round inner circumferential face with a radially inwardly directed portion that deviates from the out-of-round contour. The apparatus includes first and second spaced cylindrical rollers each having a diameter which is substantially less than the diameter of the workpiece. Means are provided for rotating the rollers in the same direction about their respective longitudinal axes. Braking means, which is interposed between the rollers and may be in the form of a brake shoe, has a frontal face positioned with respect to the peripheral surfaces of the rollers so that the frontal face contacts only the portion of the inner circumferential face of the workpiece which deviates from the out-of-round contour.

Abstract: An apparatus for deburring a circumferential edge of a workpiece, including a rotary deburring tool having an axis of rotation which is substantially parallel to the tangent belonging to the workpiece edge at a location contacted by the deburring tool.

Abstract: An apparatus for the non-circular peripheral machining of an out-of-round workpiece includes a lathe spindle for rotating the workpiece; a radially displaceable tool holder for carrying a tool to engage a peripheral face of the workpiece; a first and a second setting motor for displacing the tool holder in a radial direction during rotation of the lathe spindle; a first connecting device coupling the output of the first setting motor with the second setting motor and the tool holder for displacing, with incremental steps, the second setting motor and the tool holder as a unit in the radial direction; and a second connecting device coupling the output of the second setting motor with the tool holder for displacing, with incremental steps--that are of different magnitude from those of the first setting motor--the tool holder in the radial direction relative to the first connecting device and the first setting motor.

Abstract: A wear-resistant coating is provided for a sealing strip used in a rotary engine having a trochoidal chamber made of a supereutectic aluminum-silicon alloy. The coating consists essentially of chromium or a chromium alloy applied by plasma deposition welding.

Abstract: A gasket made of a fibrous and/or porous material is impregnated with a liquid saturating agent consisting essentially of an organic, synthetic and completely polymerizable liquid that does not contain agents which will evaporate during polymerization of the liquid.