Nov 25, 2020 · The effect of fine blanking on improving the edge hardness has been reported in multiple studies. This is desirable when a good finish and precision are required. The variation of percentage hardness improvement on the sheared surface along thickness reported in different studies is shown in Fig. 25 (Ref 58, 73,74,75,76,76). All studies have indicated a nearly linearly increasing hardness from CORE Metadata, citation and similar papers at core.ac.uk severe cracking at the surface may be expected. This temperature generation is a function of the alloy chemistry, extrusion speed, extrusion ratio, aspect ratio, container temperature, and initial billet temperature.3 Much of the heat generated at the surface occurs through the dead metal zone and the deformation zone shear band, which
Jan 01, 2019 · The blanked edges undergo large shear deformation and tensile residual stress, and thus the risk of delayed fracture is high, especially for the 1.5 GPa sheet. The effects of residual stress, surface quality and hardness of the sheared edge on the occurrence of delayed cracking were examined. Determination of the Values of Critical Ductile Fracture are good ones . The effect of punch-die clearance on the different zones of the cut surface for ne blanking can be found in , and the results indicate that the increase of the clearance decreases the depth of the shear zone and increases the depth of the fracture zone. The blanking operation of very Effect of surface hardness and roughness produced by The effect of surface hardness on the shear yield strength is shown in Figure 5(a), where higher values of shear yield strength were obtained with increasing the hardness, for fixed cutting speeds. This is related to the fact that an augmentation of the work-hardened surface, caused by the forces acting between the surface layer and the tool
Apr 15, 1999 · The effect of high-speed blanking on the sheared edges was studied by Jana and Ong . Their investigations showed that the use of high punch-speeds generally resulted in blanks being produced with an improved surface finish as compared to those obtained at low speed. Effect of two-stage press blanking on edge stretchability Aug 09, 2020 · A rectangular initial blank sheet of XF980 with a width of 80 mm and length of 280 mm was utilized for the blanking experiments at a punch speed of 10 mm/s. To limit material flow into the die cavity, a sufficient blanking holding force of 7.0 ton was applied to the initial blank. and the effect of blanking gap on the edge stretchability Effects of over-roll thickness on cone surface roughness In shear spinning process, Chen et al.  investigated the effects of over-roll thickness on cone surface roughness and draw the conclusion that deeper over-roll combining with the thinner blank
Fine blanking aims to increase the length of the shear zone and decrease the torn zone during the blanking process. Fine blanking also can decrease the height of burrs. Now almost all stamping factories are trying to improve metal stamping products quality and through some simple ways to achieve precision fine blankings effect. Journal of Physics:Conference Series PAPER OPEN Dec 18, 2019 · known as rollover, shear zone, fracture zone and burr. Their formation depends on various blanking process parameters such as punch-die clearance [1,2,3], punch-die radius , punch speed , and temperature. Previous researchers have been analyzing the effects of process parameters on shearing mechanism PAPER OPEN ACCESS Effect of punch velocity on punch May 18, 2020 · In the blanking process, punch velocity effect on blanking investigated by Lubiz and Mahardika on copper . It also studied on brass by Ristiawan and Mahardika . Maiti et al.  used finite element method to study of parameter process effect on blanking. In recent year, the influence of punch velocity also studied in the punching process.
Jan 01, 2014 · As presented in Table 1, the shear zone ranges from 0.23 mm of no damped condition (Fig. 3 (a)) to 0.35 mm with the magneto-rheological dampers (Fig. 3 (d)). Therefore, with the magneto-rheological dampers the shear zone increases up to 17.7% of the total thickness compared with un-damped condition blanking. Analysis of Shear Droop on Cut Surface of High The fine-blanking process is used in the production of automobile parts and other metal components. Although the fine-blanking process can produce sheared surfaces with higher precision than the punching process, shear droops on cut surfaces are also formed, as in the punching process. It is important to determine the causes of the formation of shear droops, but the mechanism is difficult to