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Ultrasonic technology fatigue PT role in the manufacture of aviation

Ultrasonic technology fatigue PT role in the manufacture of aviation,Ultrasonic technology fatigue PT role in the manufacture of aviation

 The purpose of high-energy ultrasound PT metalworking process is the use of composite energy to significantly reduce the surface roughness value , reduce or eliminate the stress concentration points , such as machining marks and scratches , reduce the stress concentration factor and notch effect , while refined metal grain and improve the surface hardness of the workpiece, eliminating tensile stress, pre- stress , and ultimately improve the fatigue properties of the workpiece, to extend the fatigue life of the workpiece.

    In the traditional "forming" manufacturing , we tend to only pay attention to the appearance of the shape of the workpiece , do not focus on the mechanical properties such as fatigue properties , and high-energy ultrasound technique after PT used in basic processing, quality and mechanical properties of the surface of metal parts have been improved , which the surface roughness is higher than traditional turning, milling Qiejia way three technology levels, up to R a0.2 less ; while improving surface hardness of more than 20% ; presets good stress, eliminate the workpiece surface knife pattern , stress concentration and other defects ; improve the corrosion resistance of the workpiece more than 40% , more than 50% improved wear resistance , high-energy ultrasound PT machined parts can improve fatigue life several times .
    Fatigue manufacturing control surface integrity to fatigue and improve performance as the primary criterion of the fatigue strength of advanced manufacturing technology, which is the premise of parts without changing the size of the material and interface by changing the material in the manufacturing process of the organization and stress distribution to improve the fatigue life of components manufacturing technology . A prominent feature of this technique is to change the structure of parts and materials , without increasing the weight of the material , but can greatly improve the fatigue life. Compared with anti-fatigue Manufacturing forming manufacturing, processing quality evaluation is not only consistent with the design drawings must also be consistent with the design performance , while ensuring the workpiece size , shape and position tolerances qualified , more attention fatigue properties of the workpiece.
    Manufacturing fatigue evaluation index is an important surface integrity , surface integrity is the general term of geometrical properties of the surface after processing and physical properties of the parts , the surface comprises a surface roughness geometric characteristics , waviness , texture , scratches , geometric the shape and size deviation and other technical indicators , if the surface roughness of the poor, there are marks on the surface forming a stress concentration points , increasing the stress concentration factor and notch effect [ 5 ] ( Figure 1 is a surface roughness R a0.015 enlarged three-dimensional surface of the real situation ) , it formed a source of fatigue crack initiation . The physical properties including surface microstructure of the surface layer , plastic deformation , recrystallization, micro-hardness , residual stress, micro-cracks , stress concentration , etc., belong to the internal processing effects.
 
    The purpose of high-energy ultrasound PT metalworking process is the use of composite energy to significantly reduce the surface roughness value , reduce or eliminate the stress concentration points , such as machining marks and scratches , reduce the stress concentration factor and notch effect , while refined metal grain and improve the surface hardness of the workpiece, eliminating tensile stress, pre- stress , and ultimately improve the fatigue properties of the workpiece, to extend the fatigue life of the workpiece.

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