Investigasi simulasi numeris dan eksperimen proses springback berbentuk cup silider pada lembaran baja karbon SPCC Numerical simulation and experimental investigation of springback process of carbon steel SPCC sheet shaped cylinder cup

The sheet metal forming (SMF) process is one of the manufacturing processes that essential and commonly used in the automotive industry. Compared with casting and forging, forming process into the metal sheet obtain several advantages, including lightweight materials and variations in shapes that can be made. One of the challenges in the SMF process is the springback phenomenon, which can cause a deviation in the size of sheet products. The springback occurs due to the reverse force phenomena due to the effect of its elasticity of sheet carbon steel material that has to experience the formation process. Ironing of SPCC sheet metal with a thickness of 0.8 and 1.0 mm is carried out in a pressure of 2.9 MPa with die velocity 60 mm/sec. The experimental data that carried out with a single die on the Cup Silinder sample test showed that the lower the value of ironing, the higher the value of the springback material. Therefore, the springback phenomenon can be reduced 0.03 to 0.07 mm by engineering the ironing process with a range of 0.15 mm.

A Sheet Metal Forming (SMF) process, especially deep drawing, is one of the manufacturing processes that commonly used in the automotive industry. Compared with casting and forging, the SMF process has several advantages, including lesser weight materials and broader variations in shape that can be made. One of the problems in the SMF process is the wrinkling phenomenon, which can cause the size and appearance defects of sheet products. The wrinkle occurs because of the mechanical properties of the material, product geometry, and blank holder force (BHF). Several variations of BHF were applied in these simulations and experiments to eliminate the wrinkle defects of cylinder flange cup test products. The characteristic of the cylinder flange cup is from the cold-rolled coiled steel plate (SPCC) type of material with a thickness of 0.8 and 1.0 mm, the height of 10 mm, the inner diameter of 58 mm, and flange diameter of 76 mm. Simple simulations of the SMF process were carried out by using Solidworks with version 2017, and the experiment was carried out at a 600 kN press with a punch velocity of 40 strokes per minute and blank holder force variations from 0 to 21 kN. The experimental data performed with a single die on a flanged cup cylindrical test material shows that the higher the blank holder force (BHF) number, the smaller the wrinkle defect, and it can be eliminated starting from the BHF number of 15 kN.