Controlling temperature and speed is crucial for ensuring product quality in the process of aluminum large-scale drawing or stretching. Here are some key control measures:
1、 Temperature control
Aluminum rod temperature:
Aluminum bars need to be preheated to an appropriate temperature before drawing to ensure good plasticity and flowability. For 6xxx series aluminum alloys (such as 6063), the temperature of the aluminum rod should generally be maintained between 400-540 ° C, with an optimal range of 470-500 ° C. Excessive temperature may cause tearing, while low temperature can affect extrusion speed and product quality.
The control of aluminum rod temperature is usually achieved through a heating furnace, which requires precise control of the temperature and heating time of the heating furnace to ensure uniform heating of the aluminum rod.
Mold temperature:
The mold temperature is crucial for the quality of extruded profiles. Low mold temperature can increase extrusion resistance and even cause mold blockage or damage; Excessive temperature may accelerate mold wear and affect product quality. The mold temperature should generally be maintained at around 426 ° C.
The control of mold temperature can be achieved through mold heating furnaces or online heating systems, and it is necessary to regularly check and adjust the mold temperature to ensure that it is in the best condition.
Export temperature:
The export temperature refers to the temperature of the profile after being extruded from the mold. This temperature has a direct impact on the microstructure and properties of the profile. The export temperature should be maintained within an appropriate range (such as 550-575 ° C) to ensure that the alloying elements (such as magnesium) in the aluminum alloy can be fully melted and evenly distributed, thereby improving the mechanical properties and corrosion resistance of the product.
The control of export temperature can be achieved by adjusting parameters such as extrusion speed and cooling method. For example, increasing the flow rate of cooling water or lowering the temperature of cooling water can lower the outlet temperature.
2、 Speed control
Traction speed:
The speed of the tractor is an important parameter in the aluminum pulling process, which directly affects production efficiency and product quality. The speed of the tractor should be adjusted according to factors such as the material, shape, size of the profile, and the performance of the extruder.
In modern aluminum processing, the speed of the tractor can reach a high level (such as 80 meters per minute), but this requires advanced equipment and precise process control to support.
Squeezing rod speed:
The extrusion rod speed is the forward speed of the extruder push rod and a key indicator for measuring the extrusion force and speed. The selection of extrusion rod speed should be determined based on the type of alloy, the complexity of the profile, and the expected mechanical properties.
The control of the extrusion rod speed requires precise adjustment of the hydraulic or mechanical system of the extruder to ensure that the flow speed and time of the alloy in the mold are in the optimal state.
3、 Comprehensive control measures
Real time monitoring and adjustment:
During the aluminum drawing process, real-time monitoring of various parameters (such as temperature, speed, pressure, etc.) should be carried out, and timely adjustments should be made based on feedback from production data. This helps to detect and solve problems in a timely manner, ensuring the stability of the production process and consistency of product quality.
Equipment maintenance and upkeep:
Regular maintenance and upkeep of production equipment are important measures to ensure smooth production and product quality. Regular inspections should be conducted on the performance and condition of heating furnaces, extruders, molds, and other equipment, and worn parts should be replaced and repaired in a timely manner.
Personnel training and management:
An excellent production team is the key to ensuring the stability of the aluminum drawing process and product quality. We should strengthen the training and management of production personnel, improve their technical level and operational experience, so that they can proficiently master the control methods of various process parameters.
In summary, by accurately controlling parameters such as temperature and speed during the aluminum drawing process, and strengthening comprehensive management measures such as equipment maintenance and personnel training, product quality and production efficiency can be effectively improved.
Source: Internet
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