Method of honing bores

Abstract

The invention describes a method for honing a hole (3) having two hole sections (4, 5) connected one behind the other in the axial direction of the hole (3), the surfaces to be machined of the hole sections having different hardnesses. The honing tool (1) is supported radially in the unhardened bore section (4), while the hardened bore section (5) is machined and thus ground with the honing stick (10) mounted on the honing tool (1). drop material. The feed adjustment of the honing stick (10) takes place in a force-controlled electromechanical feed and the working stroke of the honing tool is continuously varied at least towards the end of the honing process.

Description

technical field [0001] The present invention relates to a method of honing bores and in particular cylinder bores of crankcases of internal combustion engines. Background technique [0002] In truck engines, centrifugally cast cylinder liners are often used as cylinder running surfaces because this material is more wear-resistant than the engine block material. However, such a cylinder liner entails relatively high costs, not only in terms of production, but also in terms of installation of the engine block. Therefore, it has long been proposed to locally harden the running surfaces of the cylinders in the engine block in the upper reversing zone of the piston movement, in order thereby to obtain a higher wear resistance. A separate cylinder liner can thus be dispensed with. As far as hardening is concerned, for example by means of a laser, a more economical or cost-effective alternative is induction hardening. Non-concentric hole shrinkage occurs during induction hardeni...

AI Technical Summary

Problems solved by technology

But such cylinder liners lead to higher costs, not only in terms of manufacture, but also in terms of installation of the engine block

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