Abstract: A streamlined method for the mass production of connecting rods is disclosed, with particular applicability for anticipated in the production of rods made from powdered metal materials. The method contemplates the rough grinding of a work piece, followed by the use of a single, flexibly tooled boring machine to create crank and pin bores. The work piece is then fracture split, subjected to a final grinding process and honed to specific tolerances without the need for final boring. The entire inventive process may be implemented on a five work station assembly line, thereby reducing the capital investment in machinery and space required by previously known methods.

Abstract: A streamlined method for the mass production of connecting rods is disclosed, with particular applicability for anticipated in the production of rods made from powdered metal materials. The method contemplates the rough grinding of a work piece, followed by the use of a single, flexibly tooled boring machine to create crank and pin bores. The work piece is then fracture split, subjected to a final grinding process and honed to specific tolerances without the need for final boring. The entire inventive process may be implemented on a five work station assembly line, thereby reducing the capital investment in machinery and space required by previously known methods.

Abstract: The invention relates to a device for fracture-separating a workpiece comprising several ring-shaped workpiece sections which are aligned axially one behind the other. The device comprises at least one expansion device which can be introduced axially into a borehole, formed in each ring-shaped workpiece section and has at least one expansion element that can be expanded in at least two axial expansion areas which lie at a distance from each other in the axial direction. The expansion device is provided with an integrated expansion control device which interacts with the expansion element for controlling a variable position and/or a variable expansion distance and/or a variable expansion period and/or a variable expansion sequence of at least the two expansion areas.

Abstract: An apparatus fracture-separates an annular piece, such as a connecting rod. The apparatus includes one stationary and one mobile expandable jaw for insertion into a bore hole in the annular piece. An expanding device separates the expandable jaws. The fracture behavior of the annular piece can be influenced. To this effect, the peripheral surface of the expandable jaws is so configured that the expandable jaws engage in the inner surface of the bore hole only via a region of reference surfaces or lines which is defined locally with precision.

Abstract: A device for separating the rod and cap of a connecting rod by breaking includes a fixed expansion mandrel half on a fixed device part a mobile expansion mandrel half on a device part which moves in the direction of expansion, and support elements for the rod and the cap. The device has a long service life without operational problems and can separate the rod and cap of a connecting rod from each other with a high degree of precision. To this end, the adjustable support elements are arranged on the fixed device part and the fixed support elements are arranged on the mobile device part.