THERMAL DEFORMATION AND THE LOSS OF STABILITY DURING PLASMA CUTTING OF METAL

Abstract

The article deals with the condition of metal sheets in plasma cutting process. The initial dependence of the deformation value on the length of the sheet metal L, the cutting width H, and the cutting speed is described. Furthermore, a new dependence of the strain value on the current, voltage, and material properties is derived from this formula. At the end of the article some ways of dealing with thermal deformations of a metal sheet that occur during plasma cutting are shown such as eliminating the stress state of metal sheets, the ratio of the linear dimensions of the part to its thickness. The technique of fixing metal sheets to the cutting table, reducing waste after cutting, the effect of cutting speed on thermal deformations, the position of the sheet during cutting and uniform heating of the sheet are described.