Abstract
In order to study the effect of pulse current treatment on tool cutting performance of cemented carbide, on the basis of cutting experiment, the cutting performance of tool was treated by different current density (J=5 A/mm2, 15 A/mm2 and 35 A/mm2)processing and untreated tool was compared. The results showed that after the treatment of pulse current, when the cunent density J increases from 5 A/mm2 to 35 A/mm2, the hardness of small cylindrical sample and the transverse fracture strength of cuboid sample was improved than that untreated sample; the cutting performance increased 5.6%, 8.2% and 10.8% than that untreated tool, tool life has been improved. After the treatment of pulse current, pulse current provides the driving force for dislocation motion, strong driving force is more likely to make the dislocation multiplication and slip, high density dislocation cell is formed within the material, so that the mechanical properties increase significantly. The simulation study of turning processing based on finite element analysis software Deform 3D. The size distribution of cutting force was simulated, the simulation results and the test results were compared and analyzed, which provided guiding significance for the determination of process parameters
Highlights
The cutting tool can withstand higher temperature and mechanical shock during machining, which will cause the tool to wear, and the residual stresses will accelerate tool wear and influence the surface machining quality of the workpiece[1-3].The improvement of tool has been an important research topic in the whole machinery manufacturing industry
The sample was put into a self-made pulse current treatment device
The experiment of turning excircle was done on the NC lathe by the unprocessed tool and the tool processed by pulse current treatment
Summary
The cutting tool can withstand higher temperature and mechanical shock during machining, which will cause the tool to wear, and the residual stresses will accelerate tool wear and influence the surface machining quality of the workpiece[1-3]. To fully excavate the cutting performance, reduce tool wear, improve the machining precision of the tool, is an important way to reduce production costs, ensure product quality and improve productivity [4-6]. In recent years, pulsed current treatment as a new technology to improve the microstructure and properties of materials has the advantages of clean, high efficiency and low cost, which has attracted the attention of the material workers[7-9]. The pulsed current treatment has been reported in the field of materials electron plasticity, amorphous, crack healing and fatigue performance improvement[10-14]. The effect of pulse current treatment on microstructure and performance of cemented carbide was analyzed and studied, provide support for further systematic study the change law of tool cutting performance under the external field. The size distribution of cutting force was simulated, the simulation results and the test results were compared and analyzed, which provided guiding significance for the determination of process parameters
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