The honing process as a machining process produces final functional surfaces of bores. In addition to dimensional and form accuracy, the topographical design of the roughness profile is becoming increasingly important. This can be as smooth a surface as possible, but also a rough topography with a defined lubricating oil supply. However, the structure of the intersecting machining grooves also has a decisive tribological significance.
The function of a finish-honed surface is always to adhere, glide or seal and guide. In this respect, the areas of application of honing arise. Piston tracks of internal combustion engines as individual cylinder tracks or in the crankcase made of cast iron, aluminum or iron alloys with a wide variety of microstructures – the typical workpieces in the honing process.
Particularly high geometrical requirements are placed on valve bores in hydraulic, pneumatic and injection systems. Gear bores, connecting rod eyes, hydraulic cylinders, chassis cylinders and ceramic components are also precision workpieces that are honed in different batch sizes. Honing machines with different processing ranges (diameter, honing lenght) and degrees of automation are available for this purpose. Bores with diameters between 0.8 mm and 2000 mm and lengths up to 24 m can be machined on Gehring honing machines.
Common to all machining operations is the honing angle below which the cutting grooves cross (cross-cut). The achievable accuracies in terms of dimensional tolerance, cylinder shape and roughness meet the functional requirements of heavy-duty and energy-efficient aggregates.
Here you will find some typical workpieces for honing as well as a short film about our honing process.
This represents only a small excerpt of the parts to be machined. If you have a question or would like to know if we can process your workpiece, please contact us!
Your benefit:
A key feature of the honing process is the process kinematics. It is executed by the tool and contains the stroke, rotation and infeed movements. This kinematics results in the typical honing angle. The infeed movement causes the tool to spread radially, which causes the honing stones to contact the bore wall. It is generated by an electromechanical infeed system in which the infeed force can be controlled within adjustable limits.
In addition to kinematics, equiaxedness is a key feature of the honing process. As mentioned, the honing stones are moved against the bore wall by the radial infeed movement. Here, a honing pressure is built up by which the raised cutting crystals save material.
The infeed movement centers the tool in the bore. The bore axis and tool axis are identical. However, this requires sufficient degrees of freedom with regard to the tool arrangement. For this purpose, the tool is connected to the honing spindle in a double-jointed manner. This arrangement allows the tool to adapt to the position and inclination of the hole. This means that positional accuracies cannot be corrected by honing. However, there are exceptions, such as position honing, where a rigid tool is used.
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