ã€China Aluminum Industry Network】 1. Introduction During the extrusion process of aluminum alloy, due to the intense friction of the barrel wall, mold end face, diverter hole, welding chamber and working belt surface, the flow velocity at each position is extremely Uneven. When the extrusion is asymmetrical and the parts have different sizes and shapes, the flow unevenness will increase significantly. Moreover, in the mold design and manufacturing, the differences in flow speeds at various locations cannot be completely eliminated or adjusted. Therefore, in the extrusion molding, various forming defects such as twisting, bending, waves, and cracks are unavoidable. Extrusion die in use, the profile is not forming, wave, bending, etc. Due to the metal extrusion die hole speed caused by the failure of the test mode is unsatisfactory, is caused by one of the main reasons for failed mode. In order to eliminate these defects, the ideal result is that when the metal is extruded in the die hole, the metal flow speeds of all the particles in each part are consistent. The actual situation is that when the metal is extruded in the die hole, even the simpler profiles cannot obtain the same flow speed for each particle. Therefore, there must be a range of speed difference, when the metal extrusion die hole, when the extrusion speed of the various particles in the difference in this range, the extrusion of the profile can be stable.
2. Analysis of Stable Forming Mechanism According to the more basic principle of metal plastic forming, when metal is plastically deformed, it always flows towards the direction of small deformation resistance. Therefore, the stress state of metal is the fundamental factor that influences the metal flow deformation. In the extrusion process, some common forming defects, such as waves, twists, side bends, etc., are formed because the stress load of the extruded metal exceeds the critical stress that maintains its original stable state. Extruded metal bending, wrinkling, twisting and other deformation.
The metal of the extrusion die is generally restricted by the cross-section of the exit of the die hole and is free in all other directions and positions. At the position far enough from the die hole, the plastic forming of the metal has been completed. Therefore, to examine the stability of the extruded material, only a small part of the die hole is examined.
Taking a simple flat bar profile as an example, force analysis is performed on the metal of the extrusion die hole. For extruded aluminum profiles, the wall thickness of the profile is generally smaller than that of each profile wall and can be seen as a thin plate.
If the axial velocities at all positions of the metal extrusion die holes are completely the same, the flow stress at each part of the extruded part is equal, and the metal does not deform.
If the speed of the metal extrusion die holes are not completely equal.
3. Conclusions (1) The compressive stress in the structure is the main factor that affects the stability of the component. The tensile stress in the component does not often cause the system to lose stability or wrinkle.
(2) The buckling of the profile sheet is closely related to the wall thickness t of the profile and the width L of the profile wall. The larger the wall thickness t of the profile is, the smaller the width L of the profile wall is, and the larger the critical load of stability of the corresponding wall surface is.
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