Effect of Milling Parameters on Machined Surface Integrity of Nickel-Based Superalloy FGH4113A
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摘要: 通过铣削试验分别研究了主轴转速(300,500,650,800,1 200 r·min-1)、铣削进给量(0.030,0.045,0.060,0.075,0.090 mm·r-1)和单道次铣削深度(0.20,0.35,0.50,0.65,0.80 mm)对FGH4113A镍基高温合金加工表面完整性的影响。结果表明:随着铣削进给量或单道次铣削深度的增大,加工表面的缺陷增多,表面粗糙度和硬度增大,表面残余应力逐渐由压应力转变成拉应力;随着主轴转速的增大,加工表面缺陷减少,表面粗糙度和硬度降低,残余压应力减小。在铣削速度超过800 r·min-1、单道次铣削深度小于0.35 mm、进给量控制在0.045 mm·r-1以下条件下,加工表面质量较好,表面粗糙度Ra在0.40 μm左右,残余应力为压应力,且无明显硬化层。Abstract: The effects of spindle speed (300, 500, 650, 800, 1 200 r·min-1), milling feed (0.030, 0.045, 0.060, 0.075, 0.090 mm·r-1) and single pass milling depth (0.20, 0.35, 0.50, 0.65, 0.80 mm) on the machined surface integrity of nickel-based superalloy FGH4113A were investigated by milling tests. The results show that with increasing milling feed or single pass milling depth, the defects on the machined surface, surface roughness and hardness increased, and the surface residual stress gradually changed from compressive stress to tensile stress. With increasing spindle speed, the machined surface defects, surface roughness, hardness and residual compressive stress all decreased. When the spindle speed exceeded 800 r·min-1, the single pass milling depth was less than 0.35 mm, and the milling feed was controlled below 0.045 mm·r-1, the machined surface had good quality with surface roughness Ra of about 0.40 μm, compressive residual stress and no obvious hardening layer existing.
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Keywords:
- FGH4113A superalloy /
- milling /
- micromorphology /
- residual stress /
- surface roughness /
- hardness
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