The currently used aluminum tube extrusion machine includes an extrusion box and a cylinder. The heated aluminum rod is put into the extrusion box from the feed port, and the cylinder starts to work to make the extrusion beam push the aluminum rod to move towards the extrusion die. The high temperature The aluminum rod in the state has good plasticity. When the temperature of the aluminum rod decreases, the plasticity will also decrease. Under the certain pressure and speed of the extrusion beam, the extrusion pad pushes the aluminum rod to produce plastic flow and extrude from the extrusion die. , so as to obtain the aluminum tube with the required cross-sectional shape and size; during the extrusion process, the aluminum rod is in a state of strong pressure in the extrusion deformation zone, which can give full play to its plasticity and obtain a large amount of deformation, and the extrusion deformation can be improved. The structure of metal materials can improve its mechanical properties, especially for aluminum rods with extrusion effect, after quenching and aging, the longitudinal (extrusion direction) mechanical properties of the extruded products are much higher than those of similar products produced by other processing methods. Press processing also has great flexibility. It is only necessary to replace the extrusion die to produce products with different shapes, sizes and varieties on the same equipment, and the operation of replacing the extrusion die is simple and convenient, time-consuming and efficient. But there are still big problems in the forming of some double-layer seamless aluminum tubes.
The seamless aluminum pipe generally adopts the perforation extrusion method. Because the seamless aluminum pipe has the characteristics of small specific gravity, easy processing, and high mechanical strength, in fact, the production process requirements of the seamless aluminum pipe are relatively strict and fine.
However, some problems should be paid attention to in the production process in order to produce high-quality seamless aluminum tubes.
Problems needing attention in the production process of seamless aluminum tube
Large seamless aluminum tubes are generally hot extruded and then subjected to subsequent practical processing. The small seamless aluminum tube can be hot extruded or cold drawn, and then subjected to subsequent effective treatment.
The alumina hydrate produced in the production process of the seamless aluminum tube requires continuous extrusion, and during the extrusion process, it is violently dehydrated to form blisters. In order to prevent trachoma on the seamless aluminum tube, the round aluminum rod for extrusion should not have rolling cracks; it should not be stored in a humid environment, and the sodium hydroxide content in the cleaning solution should be about 30%. Control the aluminum ion content in the cleaning solution.
