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借助工艺实验和数值模拟技术,优化了55Cr Mo钢精密滚珠丝杠感应加热及冷却工艺参数,改善了丝杠感应淬火后的淬硬层分布。构建了丝杠单感应圈加热的有限元模型,通过数值模拟得到了单感应圈加热时沟道区域的温度曲线。数值模拟结果表明:沟道区域的温度场分布不合理是导致淬硬层分布不合理的主要原因。针对单感应圈感应淬火工艺的不足,提出了双感应圈加热工艺。数值模拟结果表明,采用双感应圈加热工艺、喷水冷却带宽度为40 mm时,可保证丝杠沟道顶部的淬硬层深度约为6.2 mm,沟道底部的淬硬层深度约为3.0 mm。工艺实验结果表明,丝杠沟道区域的淬硬层分布得到较大的改善,数值模拟结果与工艺实验结果吻合得较好。
With process experiment and numerical simulation, the parameters of induction heating and cooling for precision ball screw of 55Cr Mo steel were optimized, and the distribution of hardened layer after induction hardening was improved. A finite element model of the heating of screw single induction coil was constructed. The temperature curve of the channel region during single induction coil heating was obtained by numerical simulation. Numerical simulation results show that the main reason for the unreasonable distribution of the hardened layer is the unreasonable distribution of the temperature field in the channel region. Aiming at the shortage of single induction induction hardening process, a double induction heating process is proposed. Numerical simulation results show that when the cooling zone width is 40 mm, the depth of the hardened layer at the top of the screw channel is about 6.2 mm and the hardened layer depth at the bottom of the channel is about 3.0 mm. The experimental results show that the distribution of hardened layer in the screw channel area is greatly improved, and the numerical simulation results are in good agreement with the experimental results.