Device and method for quality testing sheet metal parts

1. A device for quality testing sheet metal parts with a testing device, comprising:

a frame having at least two receptacles for mounting the sheet metal part,

a pulse generator that excites the sheet metal part to oscillate,

an elastomer bearing attached to the frame and to feet secured on a floor or on a machine part so as to decouple oscillations of the sheet metal part from the floor or the machine part,

a sound sensor that picks up a sound profile caused by the oscillations of the sheet metal part, and

an evaluation unit that compares the recorded sound profile with a reference curve and generates a signal with which the sheet metal parts are classified,

characterized in that sheet metal parts can be fed to the testing device in a clock cycle controlled fashion, wherein sheet metal parts whose recorded sound profile does not lie in a tolerance range of the reference curve can be eliminated by a sorting device.

2. The device as claimed in claim 1 ,

characterized in that the at least two receptacles are spaced apart from one another at a distance that corresponds to a major part of a length or width of the sheet metal part.

3. The device as claimed in claim 1 ,

characterized in that the receptacles are oscillation-decoupled from the frame.

4. The device as claimed in claim 3 ,

characterized in that the receptacles are constructed from elastomer and receptacle bolts penetrate the receptacles.

5. The device as claimed in claim 4 ,

characterized in that the receptacle bolts are of rounded design.

6. The device as claimed in claim 2 ,

characterized in that the sound sensor arranged in a vicinity of one of the receptacles.

7. The device as claimed in claim 2 ,

characterized in that the pulse generator is arranged in a vicinity of one of the receptacles.

8. A method for quality testing sheet metal parts with a testing device, comprising:

using a feed device for feeding the sheet metal parts in a clock cycle controlled fashion from a press line arranged upstream to the testing device,

placing the sheet metal part on two receptacle bolts of the testing device,

employing a pulse generator for exciting the sheet metal part to oscillate,

picking up a sound profile of the oscillating sheet,

comparing the sound profile with a reference curve and generating a signal with which the sheet metal parts are classified, and

eliminating the sheet metal parts whose recorded sound profile does not lie in a tolerance range of the reference curve.

9. The method as claimed in claim 8 ,

characterized in that the pulse generator excites the sheet metal part resting on the two receptacle bolts to oscillate, during which the sound profile is recorded by a sound sensor.

10. The method as claimed in claim 9 ,

characterized in that the recorded sound profile is compared with a reference curve in an evaluation unit.

11. The method as claimed in claim 10 ,

further comprising: transferring the sheet metal part to a subsequent processing station if the recorded sound profile lies within the reference curve.

12. The method as claimed in claim 10 ,

further comprising: transferring the sheet metal part to an intermediate station if the recorded sound profile lies outside the reference curve.

13. The method as claimed in claim 12 ,

further comprising: subjecting the sheet metal parts that have been transferred to the intermediate station to a second quality testing means.