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首页> 外文期刊>Journal of Materials Processing Technology >Abrasive micro-blasting to Improve surface Integrity of electrical discharge machined WC-Co composite
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Abrasive micro-blasting to Improve surface Integrity of electrical discharge machined WC-Co composite

机译：喷砂微喷处理可改善放电加工的WC-Co复合材料的表面完整性

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摘要

This study investigates the improvement of surface integrity of wire electrical discharge machined (EDM) WC-Co composite by abrasive micro-blasting. The thermally damaged recast layer generated by EDM has craters, cracks, and bubbles, which deteriorate the surface mechanical properties. The micro-blasting, using 6-12 and 4-20 um m size SiC abrasive, enables the removal of the recast layer and is suitable for micro mechanical components. The surface roughness of EDM rough cut WC-Co parts was improved significantly, with the average surface roughness (7a) dropping down from 1.3 to 0.7 mu m. Scanning electron microscope (SEM) was used to examine the evolution change of surface texture and subsurface cross-section of EDM WC-Co workpiece. The SEM micrographs showed that the recast layer was removed efficiently. After 5 s of micro-blasting, surface textures with ridge and cavity patterns were observed on fine and rough cut EDM surfaces, respectively. These surface textures could be correlated to the surface roughness measurement and crater formation in EDM spark erosion. A series of erosion wear experiment was conducted to quantify the weight reduction, calculate the erosion wear rate, and identify the wear mechanism.
机译：本研究研究了通过磨料微喷处理改善电火花加工（EDM）WC-Co复合材料的表面完整性。由EDM产生的热损坏的重铸层具有缩孔，裂纹和气泡，从而降低了表面机械性能。使用6-12和4-20 umm尺寸的SiC磨料进行微喷砂，可以去除重铸层，适用于微机械部件。 EDM粗加工WC-Co零件的表面粗糙度得到了显着改善，平均表面粗糙度（7a）从1.3微米下降到0.7微米。用扫描电子显微镜（SEM）观察EDM WC-Co工件的表面织构和表面下截面的演变变化。 SEM显微照片显示重铸层被有效去除。经过5秒钟的微喷砂处理后，分别在细切和粗切的EDM表面上观察到带有脊和凹坑图案的表面纹理。这些表面纹理可能与EDM火花腐蚀中的表面粗糙度测量值和火山口形成有关。进行了一系列腐蚀磨损实验，以量化重量减少量，计算腐蚀磨损率并确定磨损机理。

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