Details
| Original language | English |
|---|---|
| Pages (from-to) | 66-74 |
| Number of pages | 9 |
| Journal | Metallurgical and Mining Industry |
| Volume | 4 |
| Issue number | 2 |
| Publication status | Published - 2012 |
| Externally published | Yes |
Abstract
A device has been designed for physically modeling quenching by means of two-phase waterair spray cooling in the line of a horizontal hydraulic extruding press. The influence of the section velocity and the water/air pressure ratio has been investigated using the combinations 5/3, 3/3 and 1/2 bar. The temperature change has been measured in an EN AW6060 alloy profile having a 20×40 mm cross-section during cooling from temperatures of about 550°C. The cross section's temperature reduction was determined prior to entering the workspace of the first pair of nozzles, due to heat transfer along the length of the sample as well as during its translation along the rows of nozzles. The temperature difference between the surface (at a depth of 1/6 of the section thickness) and the longitudinal axis of the section was quantified. This difference increases with reduced profile velocities and decreases with higher pressures of both spray components water and compressed air. For the investigated research conditions, this difference ranges from 6 °C to 60°. Immediately after a length of the profile's crosssection exits the nozzle zone, a temperature equilibrates over the cross-section: for 0.3 seconds, the temperature gradient in the cross-section is reduced by 5-fold at a surface depth of a 1/3 of the section thickness. The average values of the heat transfer coefficients in the temperature range of 500 °C to 200° were determined by the equilibrium method. These coefficients can reach up to 21 kW/(m2K) for a water pressure of 5 bar and an air pressure of 3 bar at cooling rates of 85 K/s. The required mechanical properties were obtained according to the EN 755-2 for all cooling variants having a final profile temperature of more than 350°C.
Keywords
- Aluminum alloy en aw-6060, Profile temperature, Two-phase water-air spray cooling
ASJC Scopus subject areas
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
- Materials Science(all)
- Metals and Alloys
- Earth and Planetary Sciences(all)
- Earth and Planetary Sciences (miscellaneous)
- Engineering(all)
- Electrical and Electronic Engineering
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In: Metallurgical and Mining Industry, Vol. 4, No. 2, 2012, p. 66-74.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of the Water-Air Cooling Process of the Thick-Walled Extruded Profile Made of Alloy En Aw-6060 on the Output Table
AU - Golovko, A. N.
AU - Rodman, D.
AU - Nürnberger, F.
AU - Schaper, M.
AU - Frolov, Ya V.
AU - Beliaiev, S. M.
PY - 2012
Y1 - 2012
N2 - A device has been designed for physically modeling quenching by means of two-phase waterair spray cooling in the line of a horizontal hydraulic extruding press. The influence of the section velocity and the water/air pressure ratio has been investigated using the combinations 5/3, 3/3 and 1/2 bar. The temperature change has been measured in an EN AW6060 alloy profile having a 20×40 mm cross-section during cooling from temperatures of about 550°C. The cross section's temperature reduction was determined prior to entering the workspace of the first pair of nozzles, due to heat transfer along the length of the sample as well as during its translation along the rows of nozzles. The temperature difference between the surface (at a depth of 1/6 of the section thickness) and the longitudinal axis of the section was quantified. This difference increases with reduced profile velocities and decreases with higher pressures of both spray components water and compressed air. For the investigated research conditions, this difference ranges from 6 °C to 60°. Immediately after a length of the profile's crosssection exits the nozzle zone, a temperature equilibrates over the cross-section: for 0.3 seconds, the temperature gradient in the cross-section is reduced by 5-fold at a surface depth of a 1/3 of the section thickness. The average values of the heat transfer coefficients in the temperature range of 500 °C to 200° were determined by the equilibrium method. These coefficients can reach up to 21 kW/(m2K) for a water pressure of 5 bar and an air pressure of 3 bar at cooling rates of 85 K/s. The required mechanical properties were obtained according to the EN 755-2 for all cooling variants having a final profile temperature of more than 350°C.
AB - A device has been designed for physically modeling quenching by means of two-phase waterair spray cooling in the line of a horizontal hydraulic extruding press. The influence of the section velocity and the water/air pressure ratio has been investigated using the combinations 5/3, 3/3 and 1/2 bar. The temperature change has been measured in an EN AW6060 alloy profile having a 20×40 mm cross-section during cooling from temperatures of about 550°C. The cross section's temperature reduction was determined prior to entering the workspace of the first pair of nozzles, due to heat transfer along the length of the sample as well as during its translation along the rows of nozzles. The temperature difference between the surface (at a depth of 1/6 of the section thickness) and the longitudinal axis of the section was quantified. This difference increases with reduced profile velocities and decreases with higher pressures of both spray components water and compressed air. For the investigated research conditions, this difference ranges from 6 °C to 60°. Immediately after a length of the profile's crosssection exits the nozzle zone, a temperature equilibrates over the cross-section: for 0.3 seconds, the temperature gradient in the cross-section is reduced by 5-fold at a surface depth of a 1/3 of the section thickness. The average values of the heat transfer coefficients in the temperature range of 500 °C to 200° were determined by the equilibrium method. These coefficients can reach up to 21 kW/(m2K) for a water pressure of 5 bar and an air pressure of 3 bar at cooling rates of 85 K/s. The required mechanical properties were obtained according to the EN 755-2 for all cooling variants having a final profile temperature of more than 350°C.
KW - Aluminum alloy en aw-6060
KW - Profile temperature
KW - Two-phase water-air spray cooling
UR - http://www.scopus.com/inward/record.url?scp=84880955579&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:84880955579
VL - 4
SP - 66
EP - 74
JO - Metallurgical and Mining Industry
JF - Metallurgical and Mining Industry
SN - 2076-0507
IS - 2
ER -