Sheet Metal Bending Technology Ⅱ
188.8.131.52 bending radius
While bending process of sheet metal, there is bending radius, bending radius can’t be too big or too small, should choose bending radius properly. If bending radius is too small, bent part sheet metal will cracked; if bending radius is too big, bending rebound will happen.
184.108.40.206 Bending rebound
Rebound angle Δα=b-a
b-actual angle after rebound of bent sheet metal;
a-angle of die.
220.127.116.11 Interference phenomenon while bending
For twice or above twice bending, there is always interference phenomenon between bent sheet metal and bending tools, as shown in figure 1-6, the black position is interfered part, bending process can’t be done for this case, or sheet metal will deform due to interference.
Figure 1-6 interference phenomenon of bending
For such kind case, we can choose different shape bending tools to avoid interference phenomenon. Check figure 1-7 for various bending tools available.
Figure 1-7 various bending tools
18.104.22.168 Once die edge bending
Method of die edge bending process: check figure 1-8, first use 30° die to form sheet metal to 30°, and then press to flat.
Figure 1-8, die edge bending method
22.214.171.124 180° bending
Method of 180° bending: check figure 1-9, first use 30° die to form sheet metal to 30°, and then press to flat, and take out base pad.
Figure 1-9 180° bending
H is the thickness of plate, such as 0.5mm, 0.8mm, 1.0mm, 1.2mm.1.5mm, and 2.0mm. Normally, thickness of plate can’t be too big.
126.96.36.199 Tripartite folds die edge forming
See figure 1-10, first shape forming, and then die edge forming.