According to this method, aluminum and aluminum alloy processing can be divided into rolling, extrusion, drawing, forging, spinning, forming processing and deep processing.
A.Rolling
Rolling is a plastic deformation process in which the ingot is pulled into the rotating rollers by friction, and the cross section is reduced, the shape is changed, the thickness is thinned, and the length is increased with the help of the pressure exerted by the rollers. Depending on the direction of roll rotation, rolling can be divided into longitudinal rolling, cross rolling and cross rolling. During longitudinal rolling, the rotation direction of the work roll is opposite, and the longitudinal axis of the rolled piece and the axis of the roll are perpendicular to each other. It is the most commonly used method in flat roll rolling of aluminum alloy plates, strips, and foils; during cross rolling, the rotation direction of the work roll is The rotation direction is the same, the longitudinal axis of the rolled piece and the roll axis are parallel to each other, which is rarely used in the rolling of aluminum alloy plates and strips; during cross rolling, the working roll rotates in the same direction, and the longitudinal axis of the rolled piece is aligned with the roll axis. slope. Double-roller or multi-roller cross-rolling is commonly used in the production of aluminum alloy pipes and certain special-shaped products. According to different roller systems, aluminum alloy rolling can be divided into two-roller system rolling, multi-roller system rolling and special roller system (such as planetary rolling, V-shaped rolling, etc.) rolling: according to different roll shapes, aluminum alloy Rolling can be divided into flat roll rolling and groove roll rolling. According to different product varieties, aluminum alloy rolling can be divided into plate, strip, foil rolling, bar, flat bar and special-shaped profile rolling, pipe and hollow profile rolling, etc.
B. squeeze
Extrusion is a method of loading an ingot into an extrusion barrel, applying pressure to the metal through the extrusion shaft, and extruding it from a die hole of a given shape and size, causing plastic deformation to obtain the required extrusion product. processing method. The direction of metal flow is different during extrusion. Extrusion can be divided into forward extrusion, reverse extrusion and combined extrusion. During forward extrusion, the movement direction of the extrusion shaft is consistent with the flow direction of the extruded metal, while during reverse extrusion, the movement direction of the extrusion shaft is opposite to the flow direction of the extruded metal. According to the heating temperature of the ingot, extrusion can be divided into hot extrusion and cold extrusion. In hot extrusion, the ingot is heated to above the recrystallization temperature for extrusion, while in cold extrusion, the ingot is extruded at room temperature.
C. Pulling
Drawing is a stretching machine (or drawing machine) that uses clamps to pull out aluminum and aluminum alloy blanks (wire blanks or tube blanks) from molds of a given shape and size, causing them to plastically deform to obtain the required shape. Processing methods of tubes, rods, shapes and wires. According to the variety and shape of the products produced, stretching can be divided into wire stretching, pipe stretching, bar stretching and profile stretching. Pipe drawing can be divided into empty drawing, core head drawing and floating core head drawing. The main elements of the stretching process are the stretching machine, the stretching die and the stretching reel. According to the stretching mold matching, stretching can be divided into single-mode stretching and multi-mode stretching.
D.Forging
Forging is a processing method in which a forging hammer or press (mechanical or hydraulic) applies pressure to aluminum and aluminum alloy ingots or forging blanks through the hammer head or indenter to cause plastic deformation of the metal. There are two basic methods of aluminum alloy forging: free forging and die forging. Free forging is to place the workpiece between flat anvils (or anvils) for forging; die forging is to place the workpiece in a mold of a given size and shape, and then apply pressure to the workpiece for forging deformation to obtain the required die forging. . The forging repair process is an important part of the aluminum alloy die forging process. Since aluminum alloy is soft, highly viscous and has poor fluidity at high temperatures, it is easy to stick to the mold and produce various surface defects (folding, burrs, cracks, etc.). Before proceeding to the next process, it must be polished, repaired, and surface defects removed. Clean, otherwise defects will further expand in subsequent processes and even cause forgings to be scrapped.
Tools used for repair include pneumatic grinders, pneumatic milling cutters, electric milling cutters and flat shovels. Before repairing the damage, first check the defective area through corrosion. The repaired area should have a smooth transition, and its width should be 5 to 10 times the depth.
