Pin chasing of crankshafts
Today, the “pin chasing process” combined with CBN technology has become the industry standard for crankshaft grinding.
Eccentric grinding of pin bearings is achieved by the pin chasing movement of the grinding wheel, which follows the oscillating movement of the pin bearing. This is accomplished by an infeed axis (X-axis) with hydrostatic guideway, which is driven by a linear motor. The addition of high-resolution measuring systems in the infeed axis and in the workpiece spindle (C-axis) lead to an extremely precise system that meets the high quality requirements for a crankshaft.
In order to correctly position the crankshaft for this machining operation, it is moved and measured radially and axially after loading with a fully automatic integrated measuring probe.
In order to achieve the strict requirements in terms of dimensional accuracy and roundness, the machine is additionally equipped with an in-process measuring system that measures the required values directly from the pin and main bearings during the grinding process.
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Advantages
- Maximum shape and surface quality
- No need for complex eccentric crankshaft clamping
- In-process measuring system for high precision
- High process reliability through complete machining in a single clamping operation
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