Experimental Research on the Formation of the Third Body on the Friction Surface of Coal Cake Tamper Hammer Lifting Mechanism

A tamping machine is the key equipment of large coking coal cake forming in steelmaking industry, where loose compacted into a by reciprocating movement its hammer. In long-term friction process, third particle attached to surface pair hammer lifting mechanism often causes slip and wear plate, resulting an insufficient height hammer, uneven work collapse other problems. order avoid adverse effect body on pair, this paper studies formation tamper. The cam material (Q345B) copper-based powder-metallurgy composite plate are prepared pin-disk test disk pin, respectively. Based characteristics temperature variation test, equivalent accumulation method proposed, that is, state several samples at different times characterize condition sample stages during continuous wear, process obtained. By analyzing change composition content proportion each element bottom times, it determined Cu index body. used sample, rule inferred. Through image processing color analysis, distribution law whole identified. properties third-body obtained changes hardness morphology stage. results show with increase time, increases 22% then decreases 15%. microhardness reaches highest 7 min, which 1.4 Q345B material. maximum roughness 0.452 µm. Finally, summarized three stages: formation, equilibrium damage. Therefore, frictional vary from weak strong