INSPECTION OF ALUMINIUM EXTRUSION USING IUM EXTRUSION USING INFRARED THERMOGRAPHY
Piotr Garbacz, Tomasz Giesko
Abstract:
The paper presents the capability of an infrared thermography for surface inspection of hot aluminium extrusion. Monitoring the exit temperature of the extruded profile is the key component of the manufacturing control system. In hot metal forming technologies, the run of process and product quality are critically related to temperature. From the nature of aluminium forming, temperature is the important factor which affects the process kinetics and grain recrystallization within the material. The exit temperature of the extruded profile is usually applied as feedback value for the automatic control system. In that kind of solution only the information about local temperature value is required, which can be measured by special aluminium pyrometer. However global temperature distribution on the extruded profile surface contains information about the manufacturing process and also useful data for detecting defects. The analysis of the thermograms enables to find areas of temperature irregularity resulted from increased friction loads as well as areas of inhomogeneous emissivity caused by surface defects. In this paper, several algorithms for defect detection are described for both isothermal and non-isothermal processes. The proposed system consists of an infrared camera and computer based image analysis system. The analysis of thermograms acquired from infrared camera will enable surface inspection for detecting defects in temperature range from 400°C to 600°C. The proposed system can be applied in industry for in-line monitoring of aluminium extrusion processes.
Keywords:
infrared thermography, surface inspection, aluminium extrusion
Download:
IMEKO-TC14-2013-27.pdf
DOI:
-
Event details
IMEKO TC:
TC14
Event name:
TC14 ISMQC 2013
Title:

11th International Symposium on Measurement and Quality Control

Place:
Cracow and Kielce, POLAND
Time:
11 September 2013 - 13 September 2013
 Back