Tungsten Alloy forging Deformation Strengthening Technology

Including rotation and radial forging forging forging forging two kinds of deformation method , it works very similar. The working principle of rotary forging is 2-4 swaging die block wrought material surrounded by high-speed rotation , while the material is swaged radially forged high-speed pulse , so that reduction of the length of the process increases . Rotary forging deformation strengthening is currently China's high-density tungsten alloy penetrators major deformation processing methods. Radial forging is a precision forging range , its working principle is to use the blank symmetrically distributed around the circumference one or more pairs hammer central axis. Radial forging work with rotary forging process is the biggest difference is radial forging billet rotation, while the rotary forging hammer is rotated . The role of radial forging and forging and hammer forging hammer different, it is not based on the effect of the pressure impact force , compressive strength is more than the pressure acting on the workpiece , resulting in plastic deformation of the metal particles and the internal the transfer , resulting in close delicate workpiece materials , thereby improving the tensile strength and elastic limit , to improve the quality of parts .

Tungsten alloy material before forging generally requires heating to 600-800 ℃, the conventional forging deformation of 10% -15 % and the maximum deformation amount is generally not more than 25% to 30% , or tungsten alloy is easy to produce damage to the need for forging stress relief annealing , the annealing temperature in the range 500-1100 ℃, generally heat - forging - annealing for one cycle .

Tungsten alloy rotary forging deformation strengthening the uneven presence of mechanical properties , the strength of the tungsten alloy core , elongation and surface hardness and strength , elongation, and there is a big difference between the hardness , surface strengthening effect than the heart portion strengthening effect . The reason is: when the rotary forging , from the entrance zone to the sizing zone tapered in this process, the metal and the degree of deformation increases started ; on the gauge is exposed only a small area of metal deformation ; the conical zone and the sizing zone cross-section of the transition metal to withstand the maximum degree of deformation , so that the conical region of the outlet and inlet material deformation speed difference increases, the result is that the metal surface causes an additional bending deformation. On the other hand , since the forging die and the blank interaction , but also the surface of the blank portion and cardiac stress state and with an old throw VOLUME degrees , the surface of metal material to withstand the shear stress and distortion and residual stresses are higher than the level of heart Ministry , thus causing the surface better than strengthening core part . Compared with the rotary forging , radial forging alloys tungsten little effect unevenness , the reason is the large amount of deformation of radial forging , generally the maximum amount of deformation of the rotary forging generally the limit. Uneven but its performance still exists . Causing the alloy forged with the edge of the core section causes uneven performance and deformation degree , the deformation is small so that deformation is focused on the edge region , while the heart is small strengthening effect , increasing the degree of deformation in performance unevenness can be improved.




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