MEASUREMENT & INSPECTION
use that part.” Just a few years ago, a tolerable surface fi nish might have been 10–15 Ra
µm, now surfaces need to meet 3–5 Ra µm. “That has to do with getting parts to fi t tighter,
from automotive engines to medical devices,” he said. It is critical that manufacturers monitor surfaces con-
stantly. They can go bad for several reasons—tool wear, part holding, or chatter, according to Blind. In response to these trends, Jenoptik introduced its HOMMEL-ETAMIC wavemove system, a fully automated measuring station designed for use by staff on a production line. It combines high-precision roughness and contour mea- surement, driven by CNC technology and eight fully automatic movable axes to measure both roughness and contours in a single measuring run. It is designed to feed SPC data for crankshafts and camshafts, as well as for cylinder blocks or cylinder heads. Its contour probe measures crowning on the main bearing and pin bearing, as well as groove radii, while the roughness gage measures surfaces on the main and pin bearings and thrust surfaces. Inside cylinder blocks roughness
Super precision, high-performance endmill Ø 20.0 mm With 4 fl utes 27.0 mm fl ute length, cycle time 16 min. Variable helix and unequal index Ground with the new GrindSmart®
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measurements are performed in cylinder bores, on sealing surfaces and in the crankshaft bearing channel. “The real challenge for companies like ours today is to
provide laboratory-quality measurements in shop-fl oor envi- ronments,” stated Frank Powell product manager of grinder products of Marposs (Auburn Hills, MI). “Part tolerances have to hold 5 µm or less, and we need to measure them in envi- ronments with high and fl uctuating humidity, wide tempera- ture differences from having just being machined, parts that are dripping wet, and with environmental vibrations–real time in just a few seconds.”
The TC64-RG Surface Roughness Gauge from Blum-Novotest automatically tests workpiece surfaces in machine tools without interrupting the production process.
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A good example of how Marposs is responding to this is with its G25 gaging probe. Resembling a touch probe in appearance, Powell assures that it is really a gage for surface scanning as well as part positioning and measurement, gag- ing parts while still fi xtured in the machine in case rework- ing is required. When used for gear grinding, the G25 gage identifi es the part location and tooth spacing for purposes of aligning the part with the grinding wheel prior to grinding. The same device is then used to scan the profi le of the fi nished part in a continuous cycle.
74
AdvancedManufacturing.org | January 2015
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