To improve the machining surface integrity of HT250 gray cast iron, (W,Ti,Ta)C based nano-self-lubricating cermet tools containing nano CaF were successfully prepared by spark plasma sintering (SPS). When the content of nano CaF was 5 vol%, the flexural strength, hardness, and fracture toughness of (W,Ti,Ta)C/CaF nano-self-lubricating cermet tool were 1134 ± 39 MPa, 18.97 ± 0.22 GPa and 8.52 ± 0.33 MPa·m, respectively. The cutting experiments were carried out by minimum quantity lubrication (MQL), and the effects of nano CaF content and MQL on cutting performance were studied. The cermet tool with 5 vol% nano CaF had the optimized cutting performance under MQL conditions, with cutting forces , , and reduced by 20.5%, 37.9%, and 33.3%, respectively, cutting temperature decreased by 34.8%, and tool life increased by 16.7%. The solid-liquid dual lubrication cutting method combined with the solid lubrication CaF and MQL effectively reduced the thickness and oxidation degree of the work hardening layer. The optimized surface roughness of the workpiece after machining was 0.89 ± 0.05 μm, which is 27.6% lower than that of dry cutting.

中文翻译：

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放电等离子烧结(W,Ti,Ta)C/CaF2纳米自润滑金属陶瓷刀具材料的制备及切削性能


为了提高HT250灰口铸铁的加工表面完整性，采用放电等离子烧结（SPS）方法成功制备了含纳米CaF的（W,Ti,Ta）C基纳米自润滑金属陶瓷刀具。当纳米CaF含量为5 vol%时,(W,Ti,Ta)C/CaF纳米自润滑金属陶瓷刀具的弯曲强度、硬度和断裂韧性分别为1134±39 MPa、18.97±0.22 GPa和8.52分别为±0.33MPa·m。采用微量润滑（MQL）进行切削实验，研究纳米CaF含量和MQL对切削性能的影响。添加 5 vol% 纳米 CaF 的金属陶瓷刀具在 MQL 条件下具有优化的切削性能，切削力 、 、 分别降低 20.5%、37.9% 和 33.3%，切削温度降低 34.8%，刀具寿命提高16.7%。固液双润滑切削方法结合固体润滑CaF和MQL有效降低加工硬化层厚度和氧化程度。优化加工后工件表面粗糙度为0.89±0.05μm，比干切削降低27.6%。