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Figure 17 shows the velocity field during a chattering period during the 2DCE process. A clear interface appears when the upper punch moves downward and the lower punch moves upward as the ACE process in region I at step 500, and the contact between billet and the concave die wall can be divided into two parts: the region II and the region III. Due to the radial velocity vr toward the inside, with the axial direction up to the speed of va synthesis, result in a total of 45 degrees with the axial velocity. In the region II, the gap between the die and the metal is appeared due to the movement of the concave die, the metal flowing resistance decreases and the metal flows to the outside. In the region III, the metal flow inward due to the extrusion function of the concave die. As the chattering continue, the directions of axial and radial chattering velocities va and vr are reversed. At step 506, the clear interface disappeared and the metal flows downward in region I. In region II and III, the metal flows inward and outward separately. 发自小木虫Android客户端 |
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