The static shear extrusion bonding experiment was carried out on the Q345 plates by the solid-state metal joining device with fast shearing. Meanwhile, based on the experimental and theoretical analysis, the influence of shear rate, the press quantity on the interface formation and microstructures evolution mechanism during shear extrusion bonding process were analyzed, and mechanical properties was investigated. The results show that with the increase of the press quantity, the interface formation divides into three stages, and the grain refinement is improved through dynamic recrystallization. The deformation work is provided by the bonding device, which is affected by shear rate. When the press quantity reaches 125%, the tensile strength of the specimens with high shear rate and low rate are 499.56MPa and 500.56MPa, respectively.
A two-dimensional finite element simulation model of longitudinal welded pipe is established by the nonlinear finite element software ABAQUS. Testing enlargement mould is used for the expanding experiments for the welded pipe under the laboratory condition. The expanding force, ovality and the shape are simulated and measured. Comparing the experimental and the simulated results, the values are fitted well.
The parts with axial special-hole, which are difficult to be processed by traditional machining process because of the high cost and low efficiency, are widely used in many fields. In this paper, a new practicable method to form axial special-hole by open-die cold extrusion is put forward. The four failure types of forming axial irregular-holes by open-die extrusion are analyzed. The key parameters, cone angle, reduction, original ratio of the thickness-diameter, etc., which largely influence forming process and the limits range is analyzed by numerical simulation , and make an experiment to verify the results. Based on the analysis, the law of shaping and the limit of the key parameters are concluded. The optimum range of the die’s cone angles is from 16° to 22°.The largest reduction is 24% for the billets with concave outer profile and 22% for the billets with convex outer profile.
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