Influence of surface topography on the wear of hot forging dies

Magri, Mario Lopes; Diniz, Anselmo Eduardo; Button, Sérgio Tonini

doi:10.1007/s00170-012-4185-1

Cited by 29 publications

(22 citation statements)

References 15 publications

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“…The results show that the friction coefficient and adhesion wear are mainly influenced by the surface texture, which is independent of the surface roughness. Magri et al [57] studied the relationship between surface morphology and wear resistance during die milling. They found that the best tribological performance was that composed of microcavities generated by similar and high values of fz and ae.…”

Section: Fatigue Strength and Wear Resistance As Effected By Surface mentioning

confidence: 99%

Part Functionality Alterations Induced by Changes of Surface Integrity in Metal Milling Process: A Review

et al. 2018

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It has been proved that surface integrity alteration induced by machining process has a profound influence on the performance of a component. As a widely used processing technology, milling technology can process parts of different quality grades according to the processing conditions. The different cutting conditions will directly affect the surface state of the machined parts (surface texture, surface morphology, surface residual stress, etc.) and affect the final performance of the workpiece. Therefore, it is of great significance to reveal the mapping relationship between working conditions, surface integrity, and parts performance in milling process for the rational selection of cutting conditions. The effects of cutting parameters such as cutting speed, feed speed, cutting depth, and tool wear on the machined surface integrity during milling are emphatically reviewed. At the same time, the relationship between the machined surface integrity and the performance of parts is also revealed. Furthermore, problems that exist in the study of surface integrity and workpiece performance in milling process are pointed out and we also suggest that more research should be conducted in this area in future.

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Section: Fatigue Strength and Wear Resistance As Effected By Surface mentioning

confidence: 99%

Part Functionality Alterations Induced by Changes of Surface Integrity in Metal Milling Process: A Review

et al. 2018

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“…Surface quality may influence the life of either molds or dies, and adequate process, machining parameters and machining strategies are necessary to obtain a good surface quality. Magri et al [10] analyzed the surface of a die made of AISI H13 steel, hardened to 56 HRC, after forging AISI 1020 cylindrical (25.4 mm diameter and 31 mm height) pieces at 1.100 °C. Milling parameters were cutting speed 150 m/min; feed f z 0.25 mm/tooth (condition 1) and 0.08 mm/tooth (conditions 2, 3 e 4); radial depth of cut 0.30 mm (conditions 1, 3 e 4) and 0.10 mm (condition 2).…”

Section: Introductionmentioning

confidence: 99%

Effects of tool path strategies and thermochemical treatments on the surface roughness of hardened punches for hot stamping

Castanhera

Diniz

Button

2020

J Braz. Soc. Mech. Sci. Eng.

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The surfaces of molds and dies need to present a good quality because their roughness profiles are transferred to either cast or formed products. Dies and molds are frequently made of complex surfaces, and consequently, an adequate milling strategy is important to result in a proper workpiece surface. To evaluate the adequacy of a surface to be used as forming tool involves the use of roughness parameters like S a , S sk , S ku , S p and S v. These parameters influence some surface properties like wear resistance and lubrication capacity. In this work, different tool paths of milling and turning processes were chosen to machine a typical spherical surface used as die (punch) of hot stamping, in order to analyze the surface parameters S a , S sk , S ku , S p and S v of hardened steel samples. The used milling strategies were circular (upward and downward), radial (upward and downward), parallel contours and spiral (upward). Punches machined by all strategies were submitted to thermochemical treatments, plasma nitriding and nitrocarburizing Tenifer ® process. The cited roughness parameters were measured in both moments, before and after the thermochemical treatments. There was similarity between milled and turned results, and thermochemical treatments presented significant influence on measured surface parameters. Machining marks were smoothed by thermochemical treatments which altered surface parameters. Thermochemical treatments effects were affected by the combination of machining marks and micro-burrs from machining processes. All tests resulted in S ku parameter either close or above 3. At 45° position of the workpiece, plasma nitriding tended to decrease roughness S a , S p and S v values and present positive values of parameter S sk. Nitrocarburizing process tended to increase roughness S a , S p and S v values and present negative values of parameter S sk , while not treated samples presented positive and negative S sk values, depending on the machining strategy.

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“…The finishing operation is crucial to determine the life of the mold/die [24]. Generally, the low values of surface roughness obtained with lower feed per tooth produce molds with long life [25,26].…”

Section: Introductionmentioning

confidence: 99%

Influence of feed direction on finishing milling cylindrical surfaces in H13 hardened steel

Magalhães

Ferreira

Bezerra³

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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CNC milling of curved surfaces is a common task in the manufacture of molds and dies of products used in various industrial sectors. Notably, in recent years, the use of hard milling has helped manufacturers to obtain these parts with shorter lead times, since the part is machined in a single setup without the problems caused by part distortions from the tempering process. In this work, cylindrical surfaces were machined in AISI H13 steel tempered and annealed to 52 HRC using hard milling and high speed milling concepts in the finishing stage. The cutting tool was feed along either upward ramping or downward ramping directions, and the quality of the texture of the obtained surfaces was evaluated as well as the wear of the ball nose cutter. The results showed that the surface is deteriorated when milling is performed in the downward direction (surface roughness equal to 6.93 μm) compared with the upward direction (2.17 μm). Also, vibration marks are present on the machined surface in the downward direction. In addition, surface roughness is worsened when the tool performs the cut primarily at regions away from the center of the tip of the ball nose cutter. On the other hand, the surface roughness is worsened when cutting with regions near the center of the tip of the ball nose cutter when milling in the upward direction. It was noticed that flank wear in both upward and downward directions was low (less than 10 μm), and micro-chipping was observed in the cutting edges.

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Influence of surface topography on the wear of hot forging dies

Cited by 29 publications

References 15 publications

Part Functionality Alterations Induced by Changes of Surface Integrity in Metal Milling Process: A Review

Part Functionality Alterations Induced by Changes of Surface Integrity in Metal Milling Process: A Review

Effects of tool path strategies and thermochemical treatments on the surface roughness of hardened punches for hot stamping

Influence of feed direction on finishing milling cylindrical surfaces in H13 hardened steel

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