Stress simulation method for polycrystalline CBN (cubic boron nitride) grain brazing and grinding synergistic effect based on Thiessen polygon partitioning

Abstract

The invention discloses a stress simulation method for a polycrystalline CBN (cubic boron nitride) grain brazing and grinding synergistic effect based on Thiessen polygon partitioning. The method comprises the following steps: generating a random Thiessen polygon by using Matlab software, narrowing microcrystal grains in the Thiessen polygon by taking the center of area as a center through a program, wherein the shape is similar, and the reduction ratio is the volume fraction; importing the generated data into Ansys, and outputting an Iges-format file; importing the generated Iges-format file into Abaqus software for editing, establishing a finite element model of single-layer brazing polycrystalline CBN grains, setting boundary conditions, inputting the material attributes, performing mesh generation on the grains, and finally performing simulation analysis. According to the method disclosed by the invention, the Thiessen polygon partitioning technology, the polycrystalline CBN grain brazing technology, a high-speed grinding technology and a finite element simulation technology are combined, and the resultant stress distribution rule between brazing and grinding is predicted in the polycrystalline CBN grain brazing and grinding process.

Description

[0001] Technical field: [0002] The invention provides a stress simulation method based on the Thiessen polygonal segmentation of polycrystalline CBN abrasive grain brazing and grinding synergy, which relates to a brazing and grinding stress distribution simulation method based on thermal-stress coupling analysis, belonging to Finite element simulation technology field. [0003] Background technique: [0004] Single-layer brazed polycrystalline cubic boron nitride (Polycrystalline Cubic boron nitride, PCBN) grinding wheel has excellent performance in terms of abrasive grain holding strength, grinding wheel sharpness, chip space, abrasive grain self-sharpening and tool precision, etc., and is usually used To process difficult-to-machine materials such as superalloys, titanium alloys and titanium-based composites. However, due to the stress concentration phenomenon in the brazing and grinding process, the polycrystalline CBN abrasive grains often break into large pieces, which ...

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Problems solved by technology

[0007] In order to overcome the defect that the prior art cannot accurately analyze the stress distribution of brazed abrasive grains during grinding, the purpose of the present invention is to provide a stress simulation of the synergistic effect of brazing and grinding of polycrystalline CBN abrasive grains based on Thiessen polygon segmentation method, the thermal-stress coupling analysis based on finite element can predict the internal stress distribution of polycrystalline CBN abrasive grains under the action of brazing and grinding forces, and can provide theoretical guidance for the research of polycrystalline CBN abrasive micro-fracture

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