Temperature Measurement Technique for Aluminium Extrusion

 

Temperature is the most important parameter in Aluminum Extrusion Process controlling Production, Wastage, Cost, Quality and the Life of the Press. Aluminum extrusion being dynamic processes, accurate continuous temperature control is possible only by using non-contact pyrometers.

Why use Multiwavelength IR Pyrometer in Aluminium Extrusion Lines?

1. Productivity – Allows for increased extrusion speed
2. Quality – Better profiles, reduces amount of scrap produced
3. Energy – Saves gas or electricity at the Die Furnace, Billet Furnace and Container electrical element.

Now let us have an brief overview of the applications,installation and models to be used to get targeted temperature measurement in Aluminium Extrusion

1. BILLET

Billets are heated in heating furnace to the required temperature, usually around 420-500 °C. The heating is intended to reduce the flow stress of the aluminum alloys and to avoid cracks and surface defects due to high temperature.

Recommended Product : 

A4-IN 

a. Simple to use - No calibration required

b. High accuracy - (1%) in real site conditions

c. Capable of measuring targets with variable emissivity.

d. Measures through smoke, dust, water vapor etc.

e.Temperature range 170°C to 550°C, 200°C to 650°C, 250° to 870°C, 300 to 1150°C

f. Rugged design

g. Full range of accessories

h. Wide range of built-in functions

i. A4-SW Application software for PC

j. A4-SW A Mobile Application software for Android via Bluetooth

 

Benefits:

 Accurate temperature control of billets is crucial to ensure Quality Extrusion and avoid burning of the precious energy. Billet measurement prevents entry of under heated billets to the press therefore keeping constant speed, quality and enhancing the life of the press.

Installation of Pyrometers for Billet temperature measurement

2. PRESS EXIT

The aluminum profiles are typically extruded at extrusion speeds in the range of 5 – 50 m/min depending on the alloy used and the profile complexity. Entry of overheated or under heated billets to the container controls the speed, quality and wastage. As extrusion speed is increased productivity is increased. For example, if aluminum profiles are usually extruded at a low temperature of 520°C and the extrusion temperature is increased to 560°C, the extrusion press speed can be dramatically increased.

Recommended Products :

A4-IN ( Features as above )

A4-S-IN

a. Simple to use - No calibration required

b. High accuracy - (1%) in real site conditions

c. Capable of measuring targets with variable emissivity

d. Measures through smoke, dust, water vapor etc

e. Temperature range 300°C to 670°C; 350°C to 850°C; 400°C to1000°C; 500 to 1270°C

f.  Rugged design

g. Full range of accessories

h. Wide range of built-in functions

i.  A4-SW Application software for PC

j.  A4-SW A Mobile Application software for Android via Bluetooth

k. Selection of scanning modes: Hottest point,Smooth point,Program point (pendulum mode),Continuous scanning (pendulum mode),Adjustable scanning range up to ± 10º,Adjustable scanning step from 0.1º to 5º

l.  Adjustable scanning time

m.Minimal working distance 1 meter

n. Maximal working distance target size dependence.

 

Benefits: 

When profiles are extruded at very high temperatures, for example between 580°C to 600°C, product may be damaged.Pyrometers can prevent this damage. 

Installation of Pyrometers at Press Exit

3. COOLING TABLE

On leaving the die, the extrusion is cooled through the use of air or water quenches. This is a critical step to ensure proper homogenous structure, dimensions and strength characteristics of extrusions.

Recommended Products :

 A4-EX 

a. Simple to use - No calibration required

b. High accuracy - (1%) in real site conditions

c. Capable of measuring targets with variable emissivity.

d. Measures through smoke, dust, water vapor etc.

e. Temperature range 170°C to 550°C, 200°C to 650°C, 250° to 870°C, 300 to 1150°C

f.  Rugged design

g. Full range of accessories

h.  Wide range of built-in functions

i.   A4-SW Application software for PC

j.  A4-SW A Mobile Application software for Android via Bluetooth

 

A4-S-EX

a. Simple to use - No calibration required

b. High accuracy - (1%) in real site conditions

c. Capable of measuring targets with variable emissivity.

d. Measures through smoke, dust, water vapor etc.

e. Temperature range 170°C to 550°C, 200°C to 650°C, 250° to 870°C, 300 to 1150°C

f.  Rugged design

g. Full range of accessories

h. Wide range of built-in functions

i.  A4-SW Application software for PC

j.  A4-SW A Mobile Application software for Android via Bluetooth

 

Benefits: 

Based on the intended use of the aluminum profiles, they are required to have different mechanical properties such as strength and hardness. These properties are achieved in two operations. The first one involves cooling of profiles in the extrusion process through the proper temperature adjustment and other one being control of extrusions leaving the die.

Installation of Pyrometers at Cooling Table

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