Effects of milling condition on the surface integrity of hot forged steel

Rodrigues, Alessandro Roger; Matsumoto, Hidekasu; Yamakami, Wyser José; Paulo, Rafael Gustavo da R.; Assis, Cleiton Lazaro Fazolo de

doi:10.1590/s1678-58782010000100006

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…In contrast, Silva 8 verified microhardness was not affected by milling of the AISI H13 steel when cutting conditions were varied. Kannan and Kishawy 9 declare particle volume fraction and average size profoundly affect the extent of plastic deformation of the material, but Rodrigues et al 10 even changing the workpiece volume fraction did not find plastic deformations near machined surface.…”

Section: Introductionmentioning

confidence: 95%

Surface integrity analysis when milling ultrafine-grained steels

et al. 2011

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This paper quantifies the effects of milling conditions on surface integrity of ultrafine-grained steels. Cutting speed, feed rate and depth of cut were related to microhardness and microstructure of the workpiece beneath machined surface. Low-carbon alloyed steel with 10.8 µm (as-received) and 1.7 µm (ultrafine) grain sizes were end milled using the down-milling and dry condition in a CNC machining center. The results show ultrafine-grained workpiece preserves its surface integrity against cutting parameters more than the as-received material. Cutting speed increases the microhardness while depth of cut deepens the hardened layer of the as-received material. Also, deformations of microstructure following feed rate direction were observed in workpiece subsurface.

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Section: Introductionmentioning

confidence: 95%

Surface integrity analysis when milling ultrafine-grained steels

et al. 2011

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“…Blümke, Sahm and Müller [5] concluded that increase of cutting speed elevated of chip segmentation in milling. Rodrigues et al [6] verified that the chip segmentation depends on workpiece material. Flom and Komanduri [7] indicated that surface finish tends to improve with HSM, but these results are not conclusive.…”

Section: Introductionmentioning

confidence: 99%

Effects Of Milling On Surface Integrity Of Low-Carbon Steel

Rodrigues

Matsumoto²,

Yamakami³

et al. 2011

AIP Conference Proceedings

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Abstract. This work measured the effect of milling parameters on the surface integrity of low-carbon alloy steel. The Variance Analysis showed that only depth of cut did not influence on the workpiece roughness and the Pearson´s Coefficient indicated that cutting speed was more influent than tool feed. All cutting parameters introduced tensile residual stress in workpiece surface. The chip formation mechanism depended specially on cutting speed and influenced on the roughness and residual stress of workpiece.

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“…Table 2 summarizes the research about the characteristics of machined surfaces produced by different types of machining operations. It is obviously seen that machined surface analysis for end milling, 1–6,9 face and slab milling, 7,8 electrical discharge machining (EDM) 9,10 and ball end milling process 9,12–17 was largely conducted by many scholars. Investigation on the machined surface generated by ball end milling process was mainly under three-axis machining conditions.…”

Section: Introductionmentioning

confidence: 99%

Research on the machined surface integrity under combination of various inclination angles in multi-axis ball end milling

Chen

Zhao

Dong

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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It is well known that the multi-axis machining technology has been developed into a key technique applied in the manufacturing field. The machined surface integrity is one of the most important factors influencing the performance of the produced components. Hence, this research concentrated on the machined surface integrity induced by the multi-axis milling operation with different inclination angle combinations. In this research work, the cutting conditions of the conventional or up-milling process with tool orientations were divided into eight different types, and the machining characteristics corresponding to different cutting strategies were discussed. The varying conditions of surface topography, texture and other machining features induced in machining process which corresponds to different inclination angle combinations were analyzed by geometrical analysis, and the surface roughness and linear profile along specific directions on the machined surface were also investigated. There is a special corresponding relationship between the rotation angle and tool tilt and lead angles. Better surface roughness could be achieved when rotation angles are 0° (positive lead), 60° (combination of positive tilt and positive lead), 90° (positive tilt) and 330° (combination of negative tilt and positive lead). Then, the samples used for study of the metamorphic layer were produced by lapping and polishing process, and the macro hardness (HL) and micro-hardness (HV) of the top machined surface were investigated. According to the measured results of both Leeb hardness and micro-hardness, higher surface hardness could be obtained under rotation angles of 60° (combination of positive tilt and positive lead), 120° (combination of positive tilt and negative lead) and 210° (negative tilt and negative lead). Moreover, the variations of the micro-hardness along the depth direction of the samples were studied. Finally, discussions on the machined surface residual stresses in both feed and cross-feed direction were carried out. Compressive surface residual stress in both feed and cross-feed direction could be generated when rotation angles are 210° (combination of negative tilt angle with smaller value and negative lead angle with larger value) and 330° (combination of negative tilt angle with smaller value and positive lead angle with larger value). Generally, the evaluation indicators of surface integrity are not all very satisfying under one special cutting condition with a certain inclination angle combination, and the optimal cutting parameters should be selected based on the specific application requirements. Finally, the optimal tool orientations and related cutting parameters were recommended, and further studies of the related topics were also presented.

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Effects of milling condition on the surface integrity of hot forged steel

Cited by 7 publications

References 4 publications

Surface integrity analysis when milling ultrafine-grained steels

Surface integrity analysis when milling ultrafine-grained steels

Effects Of Milling On Surface Integrity Of Low-Carbon Steel

Research on the machined surface integrity under combination of various inclination angles in multi-axis ball end milling

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