Control of pilot holes on wooden blanks

VISCONT system: control of pilot holes on wooden blanks

The system for the control of the pilot holes has successfully been implemented at the facility that manufactures furniture wooden blanks.

VISCONT controls the presence, location and size of the pilot holes according to the selected type of the wooden blank.

The system is integrated into the existing production line, which averages about 62 workpieces per minute and can vary up or down depending on the length of the wooden blanks.

The maximum discrepancy of determining the position in the transverse direction is 0.35 mm; in the longitudinal direction is 0.5 mm. At the same time, the accuracy of determining the position with a tolerance of 0.3 mm is 99%.

The maximum discrepancy of determining the diameter is 0.36 mm. The accuracy of determining the diameter with a tolerance of 0.3 mm is 99%.

VISCONT system is a hardware-software complex consisting of conveyor control zone and an automated workstation for the operator.

In the control zone, two high-resolution machine vision cameras are installed to obtain images from the front and rear end of the workpiece. One line scan camera is installed to obtain images from the bottom surface of the workpiece.

AWS of system operator

Automated workstation (AWS in short) is used for managing bores piloting holes control process. It enables to:

• start/stop the control process
• view information about the progress of the analysis
• view a log with analysis results, including viewing images of defective panels
• generate a report based on the results of the analysis
• perform system configuration

Brief description of the system operation

1. The operator in VISCONT AWS selects the template for the wooden blank and starts the session.
2. The wooden blank moves along the conveyor. Cameras in the control zone form images of two ends and the bottom surface of the workpiece.
3. The VISCONT system analyzes the received images using specialized video analytics algorithms.
4. In the case of any deviations in the location of the pilot holes, discrepancies in the required diameter or absence of a pilot hole; the workpiece is considered defective.
5. The pilot holes’ control results for each end and bottom surface of the workpiece are displayed in the operator's AWS.
6. When a defective workpiece is detected, the VISCONT system issues a signal for its rejection. The data on rejection can be transferred to the process control system of the marking machine or rejecter on demand.

Additional system’s capabilities

The pilot holes’ control data can be downloaded to an external file and transferred to the EPR system.