混凝土锯切加工过程的基本特征

Characteristics of Concrete Sawing Process with Diamond Tools

通过金刚石单颗粒划伤、金刚石单个节块锯切和金刚石锯片锯切系列试验,对混凝土锯切加工过程中的切屑形态和切削区表面形貌,以及切削力等基本特征进行了详细讨论。结果表明:金刚石锯片锯切混凝土的过程表现为高速锯切过程中金刚石锯片的冲击引起混凝土表层断裂破碎,水泥石子等在切削区内层受到金刚石磨粒的微切削作用形成粉屑,以及钢纤维和钢丝发生金属塑性变形断裂或被拔拉而断裂的过程。在粘性水泥粉屑以及金刚石磨粒的挤压作用下,多种形态的切屑易粘结成团,并粘附到混凝土锯切表面和锯片节块上而导致锯片堵塞。

Characteristics of concrete sawing process, including chip morphology, sawing surface and sawing force were discussed through the experiments of diamond single grain drawing, single diamond segment sawing and diamond sawblade sawing. The results show that the process of concrete sawing with diamond tools is that the impact of diamond sawblade induces the rupture and break of concrete surface layer during high speed sawing; cement and carpolite become micro chips by the cutting of diamond grits; steel fiber and steel wire are broken by plastic deformation or pulled out by forces. The multi-formation of chips often collects into groups and felts on the surface of concrete sawing area or segment, which will make the sawblade easy to be loaded under the extrusion of cement chips and diamond grits.