Apparatus for a multiple checking of internal dimensions

Details Apparatus for a multiple checking of internal dimensions Apparatus for a multiple checking of internal dimensions

1991-10-18

1993-11-09

Cuchlinski, Jr., William A.

Geometrical instruments

Gauge

Internal

33543, 335445, G01B 712, G01B 512

Patent

active

052591212

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The invention relates to a checking apparatus for multiple checkings of internal dimensions, with support means for supporting a part having at least a hole of which it is desired to check a plurality of radial dimensions in a wide measurement range; a support body mutually movable with respect to the support means along a longitudinal axis; measurement devices carried by the support body, the measurement devices including checking heads for cooperating with the surface of the hole in corresponding zones and having transducer devices providing electrical signals; coupling means between the checking heads and the support body, the coupling means permitting displacements of the checking heads to perform checkings in said wide measurement range; transducer means for detecting the position of the checking heads with respect to the support body; and actuating means including first actuating means for performing mutual displacements between the support body and the support means and second actuating means for controlling said displacements of the checking heads.
2. Background Art
A checking apparatus having the above-mentioned features is disclosed in International Patent Application WO-A-8602996, that refers in particular to an apparatus for carrying out measurements of a plurality of internal and/or external linear dimensions, comprising a support body carried by a horizontal slide, on its turn carried by a vertical slide. The support body carries a plurality of measuring heads, each of which is provided with a movable arm carrying a feeler and with a transducer for detecting the position of the movable arm with respect to the body of the head. Each measuring head can be adjusted, independently of the others, both in horizontal (radial) and vertical direction and the radial positions of the heads with respect to the support body are detected by further corresponding transducers.
The part to be checked is arranged on a rotatable support, which is rotated for performing dynamical checkings of dimensions and/or shape of a plurality of cylindrical surfaces.
In particular, a specific embodiment relates to an apparatus with four measuring heads which can be simultaneously adjusted, along radial directions at 90.degree. from one another, by means of a device having two superimposed disks, of which the upper disk has guide grooves and the lower disk through openings for vertical pins coupled to the measuring heads for adjustment control. The adjustment is carried out by causing a mutual rotation of the two disks and detecting the radial position of the heads by four position tranducers.
The apparatuses described in international patent application WO-A-8602996 although flexible or, more exactly, retoolable for checking parts of different types, do not appear adapted for automatic checkings in wide measurement ranges.
Moreover, since each measuring head is provided with its own adjustment device and corresponding transducer, radially arranged, for detecting the head position, these known apparatuses are structurally very complex, bulky, expensive and difficult to use.
Patent application GB-A-2167862 discloses an apparatus for dimensional checkings, for example of parts like turbine blades, comprising a plurality of slides equipped with transducers detecting the position of each slide with respect to corresponding supports.
In particular, a vertical slide carries two groups of measuring heads for subsequently checking two opposite sides of a blade. In fact, for carrying out a measurement cycle, the slides are automatically displaced, in sequence, to a plurality of predetermined positions, depending on the signals of the transducers associated with the slides. In each of the predetermined positions, the signals of the heads indicate deviations of the corresponding dimensions from those of a master part by means of which the apparatus is initially zero-set.
This known apparatus is dedicated to the checking of a rather complex part and is, on its turn, complex both mechanically and electroni

REFERENCES:
patent: 2659157 (1953-11-01), Aller
patent: 4338726 (1982-07-01), Swailes
patent: 4393698 (1983-07-01), Pietzsch et al.
patent: 4412385 (1983-11-01), Selleri
patent: 4872269 (1989-10-01), Sattmann
patent: 4986004 (1991-01-01), Hartmann et al.

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