TechFront
between moving parts shrink, honing can tightly control the bore’s surface finish to retain a lubricating film of oil. “Similarly, the bores of hydraulic accumulators are honed to eliminate any surface flaws that could propagate into cracks under stress. The bores of fuse pins, used at the attachment points of engine pylons, are honed to precise size and finish tolerances to ensure they shear under the correct level of stress. Multiple components in ram-air turbines are honed, as are the boltholes in turbine hubs and disks. The bores of gears used by Airbus, Boeing, Cessna, and NASA are honed for similar reasons,” said Westhoff.
In production honing, process capability with small vari- ability and high Cpk
are essential. Tool expansion to achieve
the desired results and final size is programmed based on rate of time. The tool feed system performs the same way on each cycle, starting with touch-off, sensed through spindle load or the force sensed on the tool feed system. Cycle time is always the same. However, when a batch of parts comes in with a different heat treatment, distor- tion, or variations, the operator must intervene to prevent the tool from ex- panding too quickly for part conditions and being damaged, or expanding the tool too slowly with a softer than normal workpiece, resulting in glazing of the honing stones, which won’t self-dress if the cutting force is too low. New tool feed technology that servo-controls the force in the tool feed system enables the machine to sense and compensate for variables like heat treatment, distortion or size variation replacing the need for opera- tor intervention. “The new Controlled- Force feature, which works in concert with the machine’s standard rate-feed system functions like cruise control to maintain the optimum cutting load on the honing abrasive throughout the cycle, regardless of the incoming part’s hardness, geometry or size variation. In effect, the machine detects what is happening in the bore when the abra- sive contacts it, whereas with rate-feed alone, the machine feeds the tool per
the program, not according to the real conditions the part is experiencing,” said
Westhoff.ME
For more information from Sunnen Products Co., go to
www.sunnen.com or phone 314-781-2100.
Multidirectional Radio Touch Probe
C
ompact high-speed TC62 multidirectional touch probe achieves speed, precision and shop-floor versatility along with operator convenience using innovative BRC radio technol- ogy. “The TC62 completes Blum’s range of metrology products with a radio probe that is used when a permanent visual con- nection to the receiver during measurement can’t be guaran- teed,” said Jon Kulikowski, president, Blum LMT (Erlanger, KY). Compared to probes with IR transmission, the TC radio probes are effective when used on large-scale machines, five- axis machines or when the probe has to be immersed in the
May 2013 |
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