METHOD AND BENCH FOR CAMERA-BASED PART VERIFICATION

Abstract

The method is designed for camera inspection of a part of revolution (PO), the part of revolution being held stationary during the inspection. The method comprises steps of acquiring video signals, comparing the acquired video signals to reference signals, and determining the presence or absence of a surface defect based on the results of this comparison. According to the invention, the video signal acquisition step includes acquiring video signals from a lateral surface of the part of revolution using two cameras (CA1, CA2). The cameras are oriented with different axes of view of the lateral surface and each performs a complete rotation around the part of revolution. The acquired video signals are then compared in real time to the reference signals. Figure 2

Claims

1.

2. Demands A method for verifying a part of revolution using a camera, said part of revolution (PE) being held fixed during said verification, and said method comprising steps of acquiring video signals, comparing the acquired video signals to reference signals, and determining the presence or absence of a surface defect based on the results of said comparison, characterized in that the video signal acquisition step (SI) comprises acquiring video signals (V1, VI2) of a lateral surface of said part of revolution (PE) by means of two cameras (CAI, CA2), said cameras (CAI, CA2) being oriented with different axes (AVI, AV2) for shooting said lateral surface and each performing a complete rotation around said part of revolution (PE), and in that said acquired video signals (V1, VI2) are compared in real time to said reference signals (SR). Camera verification bench for parts of revolution.for implementing the method according to claim 1, characterized in that it comprises a support structure (ST) arranged so as to be mounted overhanging a conveyor for parts of revolution (CO), a rotating arm (BR) suspended from said support structure (ST) and having an axis of rotation (AR) mechanically coupled to a servomotor (MT), two cameras (CAI, CA2) supported at respective ends of said rotating arm (BR), at least one part presence detection sensor (CPI, CP2), and a control and processing unit (CD), said unit (CD), in cooperation with said sensor (CPI, CP2), ensuring the positioning of said part of revolution (PE) so as to align its axis of revolution (AA) with said axis of rotation (AR), and, in cooperation with said rotating arm (BR), servomotor (MT), and cameras (CAI, CA2), ensuring the acquisition of video signals (V1, VI2) from a lateral surface of said part of revolution (PE),with two different shooting axes (AVI, AV2), by a complete rotation of said cameras (CAI, CA2) around said part of revolution (PE), and said unit (CD) performing a real-time comparison (S2) between said acquired video signals (Vil, VI2) and reference signals (SR) to decide on the presence or absence of a surface defect of, said part of revolution (PE) based on results (RC) of said comparison.

3. Bench according to claim 2, characterized in that it comprises four part presence detection sensors (CPI, CP2), two sensors (CPI) ensuring a function of detecting the arrival in the bench (BC) of said part of revolution (PE) and two other sensors (CP2) ensuring a function of positioning in the bench (BC) of said part of revolution (PE).

4. Bench according to claim 2 or 3, characterized in that said rotating arm (BR) has a so-called "inverted U" shape, with a bar (TH) supporting said axis of rotation (AR) and two rods (TS) extending parallel to said axis of rotation (AR) from distant ends of said bar (TH) and supporting said cameras (CAI, CA2).

5. Bench according to any one of claims 2 to 4, wherein said parts of revolution are gear pinions (PE), characterized in that said cameras (CAI, CA2) are oriented with shooting axes (AVI, AV2) permitting the viewing by said cameras (CAI, CA2) of first and second tooth flanks (Fil, FI2) inclined differently from a tooth (DE) of said gear pinion (PE).

6. Assembly comprising a parts conveyor (CO) and a parts verification bench, characterized in that said bench is a camera verification bench for parts of revolution (BC) according to any one of claims 2 to 5.

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