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AssigneeRobert Bosch GmbH
InventorsAndreas Schruefer, Christoph Schmidtlein, Herbert Beck, Johannes Weickmann
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A pneumatic plug gauge has been developed in the context of the invention. This plug gauge comprises a first measuring channel which can be connected to a pressure medium source and opens into a first outlet for the pressure medium, which outlet can be directed to a surface of the workpiece to be tested. According to the invention, this plug gauge is designed to determine the tilt angle between a section on the surface thereof and a region opposite this section on the surface of the workpiece by virtue of the first outlet being arranged at one end of the section and at least one second outlet being provided, which second outlet is arranged at the other end of the section. It has been recognized that the admittedly high precision of pneumatic length measurements can be converted in a particularly advantageous manner to high precision of the angle measurement in this manner. The tilt angle can be measured at least with an accuracy of less than one tenth of a degree. At the same time, the measurement is fast enough for 100% control in mass production. The plug gauge is the central element in the measuring system and in the method, to which the invention likewise relates.
A pneumatic plug gauge (M), comprising a first measurement channel (1) that is configured to be connected to a pressure medium source (7a, 7b) and that opens into a first outlet (1a) for the pressure medium that can be directed at a surface of a workpiece to be checked (3), wherein the plug gauge (M) is configured for determining the angle of inclination (α-β) between a path (A) on a surface of the plug gauge (M) and a region (1b, 2b, B) on the surface of the workpiece (3) opposite said path (A) by the first outlet (la) being disposed at one end of the path (A) and by the first outlet (1a) being movable to the other end of the path (A) or at least one second outlet (2a) being provided that is disposed at the other end the path (A), characterized in that the plug gauge is of a rotation symmetrical form.
A method for pneumatically determining a tilt angle (α-β) between a path (A) in space and a region (1b, 2b, B) on a surface of a workpiece to be checked (3) opposite said path (A) with a pneumatic, rotation symmetrical plug gauge (M), wherein said plug gauge (M) comprises at least one measurement channel (1, 2) that is subjected to a pressure medium by means of a choked output (7c, 7d) of a pressure medium source (7a, 7b) and that opens at an outlet (1a, 2a) that is directed towards the surface of the workpiece (3), the method comprising measuring a respective pressure between the choked output (7c, 7d) of the pressure medium source (7a, 7b) and the outlet (1a, 2a) of the measurement channel (1, 2) at both end points of the path (A).
Dependencies are inferred from the claim text.