Experimental Verification of orthogonal turning of Constitutive equation of flat Graphite cast Iron

In orthogonal turning, only one straight cutting edge is involved in the cutting, and the cutting edge is perpendicular to the cutting speed direction. The three-dimensional orthogonal turning model is established by using AdvantEdge and ABAQUS simulation software respectively, and the finite element simulation is carried out by using the constitutive equation. The simulation results and measured values are compared with the constitutive model of vermicular graphite cast iron carried by AdvantEdge software.

(1) Experimental conditions of orthogonal turning.

This experiment is carried out in DAEWOOACE-V500 vertical machining center. Figure 1 is a schematic diagram of the orthogonal turning experimental device. The tool holder is fixed to the dynamometer by using the fixture, and the force on the tool holder is measured during the experiment. When the workpiece is fixed on the spindle by a special fixture and rotates with the spindle, the thickness of the workpiece is the cutting width, the length of the cutting edge of the blade is greater than the thickness of the workpiece, only one cutting edge participates in the cutting, and the cutting edge is perpendicular to the cutting speed direction. meet the conditions of orthogonal cutting. When machining, the worktable feeds along the direction shown in the drawing to realize the orthogonal cutting process.

(2) the simulation results are compared with the measured results.

Because the hardest pearlite content in GJV450 is more than 90%, and ferrite is equivalent to pure iron, it is relatively soft. In the process of ABAQUS simulation, the LC fracture model is adopted. The fracture parameters are not set in JmurC constitutive equation in AdvamEdge simulation software.

Figure 2 is a comparison between the simulated and measured values of the main cutting force. As can be seen from figure 2, the constitutive simulation accuracy of the AdvantEdge software is the lowest, and the main cutting force is larger than the measured value, the average error is 42.315%, and the maximum error is 60.38%.

The average error of the established JC constitutive equation in AdvantEdge and Abaqus is 15.518% and 14.85% respectively, and there is little difference between the two simulation accuracy. The maximum error in the AdvantEdge simulation result is 25.93%, and the maximum error in the Abaqus simulation result is 18.64%. The maximum error of both occurs when the cutting speed is 800m/min. It can be seen that the simulation accuracy of the constitutive equation established in this paper in AdvantEdge is better than that in Abaqus when the cutting speed is low, and the simulation accuracy of the constitutive equation in Abaqus is better than that in AdvantEdge when the cutting speed is high. In a word, the JC constitutive equation is suitable for the machining simulation of vermicular graphite cast iron, and the simulation accuracy is improved.