Fracture separation

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"Cracked" connecting rod

The fracture separation ( English crack ) is the separating associated manufacturing processes mainly for mass products in which a component at one or more defined break points is broken into two or more parts. The fragments are reassembled in their original geometric shape in the later manufacturing process.

The fracture separation is known in particular in the manufacture of bearings , especially with connecting rods . To convert the stroke movement into a rotary movement, the connecting rod is connected to the crankshaft by a bearing called the "crankshaft eye". Since the crankshaft has cranks, the bearing must be divided and, when installed, meet the highest requirements in terms of dimensional accuracy in order to maintain the tight tolerances. A bearing is therefore worked into the connecting rod and then the connecting rod is broken so that the bearing is split in two in the middle. The resulting fracture structure of the surface means that both parts fit together almost perfectly. This favors later joining because it can be viewed as a form-fitting . A hydraulic expanding mandrel is driven into the connecting rod eye for separation. The prerequisite for fracture separation is that the material is sufficiently brittle so that no plastic deformation occurs. Depending on the base material, the component is therefore additionally cooled.

Today, the technology is successfully used on a large number of components, as it has a number of advantages over traditional manufacturing processes. It simplifies the production process, increases process reliability and in many cases also improves quality.