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Measurement of the essential dimensional aspects of chamfering.
STD is the standard version of the optical systems developed by Q-Tech for in-line checking of compliance in bar chamfering. Q-eye STD is available in different ranges of maximum permitted diameter of the bar being measured, starting from 30mm diameters up to maximum 50mm diameters. Bars with a non-circular section can be measured by the optical bar chamfering control system according to the maximum dimensions shown on the technical data sheet of each specific model. Measuring bars with a non-circular section does not entail any retooling of the measurement station and is basically resolved by simply setting software with the nominal parameters of the bar in production.
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The dimensional measurements that can be taken by the system include:
Geometry of the chamfer: these measurements comprise the geometric information pertaining to the head section of the bar obtained after chamfering, and particularly regard the minimum and maximum diameter of the head section, its eccentricity and the inclination of the section compared to the nominal axis of the bar.
Depth of the chamfer: the depth of the chamfer is a control parameter often specified by many standards as the primary acceptance criterion of chamfering. The minimum chamfering depth required is often linked to the actual dimensions of the bar and may generally require different values for the head and tail of the bar (pointed or chamfered machining). The depth of the chamfering is necessarily affected by the actual geometry of the bar being machined. Circular section bars can have a roughly constant machining depth along the entire perimeter, while hexagonal or square section bars by necessity will have significant ranges in the course of the the bar perimeter’s development. It is precisely for these reasons that the Q-eye STD system for optical bar chamfering control offers independent and simultaneous measurement of the machining of both ends of the bar and, for each end, measurement of both the minimum and maximum values of the depth found.
Chamfer angle: the actual angle of the bar’s chamfer is often considered the second essential diversification parameter of chamfering. In this case, the acceptance limits are often not so severe, but it is generally essential for effectively distinguishing chamfer angles ranging between extreme values of about 30 degrees and about 60 degrees. Q-eye STD independently reads the minimum and maximum angle of the chamfer on each end of the bar and with accuracy values under one degree. Early identification of an error of this parameter allows us to promptly identify in incorrect configuration of the chamfering machine or the unexpected breakage of a machining tool.
Burr presence: this control is usually not specified in the standards, but it effectively detects any malfunctions of the chamfering machine before they can lead to machinery breakage or production of non-compliant material. A burr is generally a machining residue in the centre of the bar section that emerges as a typical raised protuberance of material usually a few tenths of a millimetre thick. Its presence is a symptom of incomplete machining due to premature wear of the tools or an incorrect configuration of the chamfering machine. Our optical bar chamfering control system is able to effectively detect the presence of any residual burr on the surface of the bar, even if the burrs have thicknesses less than one-tenth of a millimetre.