DFG Project PF 394/20–1

Process optimization of the double roller strip casting process by systematic distribution of the melt into the melt pool

A modu­lar immersi­on tube was deve­lo­ped for the sys­te­ma­tic inves­ti­ga­ti­on of the influen­ces on the flow. The modu­lar design divi­des the mass flow into five cham­bers. So that the par­ti­al flows can be indi­vi­du­al­ly adjus­ted from each other, each cham­ber has a sepa­ra­te pump. This immersi­on tube sys­tem was simu­la­ted in a phy­si­cal water model as well as in a CFD model. The dimen­si­ons cor­re­spond to tho­se of an indus­tri­al plant. In the water model, the velo­ci­ty within a qua­si-two-dimen­sio­nal pla­ne is deter­mi­ned tem­po­ral­ly resol­ved accor­ding to magni­tu­de and direc­tion by the use of opti­cal mea­su­ring methods using laser tech­no­lo­gy. The cour­se of the bath mir­ror sur­face was inves­ti­ga­ted using image-pro­ces­sing mea­su­ring methods and ultra­so­nic sensors.

B2-Aufbau-mit-Pool+kos2-2PR-Bild-numerik (2)-2

During the cas­ting pro­cess, the mol­ten steel, which initi­al­ly has a tem­pe­ra­tu­re of approx. 1550 °C, soli­di­fies on the coo­led cas­ting rolls and lea­ves the plant as a solid strip. The soli­di­fi­ca­ti­on has a strong influence on the for­ma­ti­on of the flow. Sin­ce the pha­se trans­for­ma­ti­on in the water model can­not be rea­li­zed, the­se effects are inves­ti­ga­ted with nume­ri­cal simu­la­ti­ons. Based on the simu­la­ti­on results, con­clu­si­ons can be drawn about the beha­viour of the flow in the ori­gi­nal pro­cess. In this way it is pos­si­ble to iden­ti­fy in advan­ce and avo­id are­as in which over­hea­ting occurs or con­ta­mi­na­ti­on accumulates.

Logo DFGThe pro­ject was fun­ded by the Deut­sche For­schungs­ge­mein­schaft (DFG) under the refe­rence num­ber PF 394/20–1.