Research on dynamic hardening effect on workpiece’s hardness distribution with depth of cut

Sun, Cong; Wang, Jingyu; Kong, Xiangna; Lu, Yanming; Xiu, Shichao

doi:10.1007/s00170-019-03741-y

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Besides the residual stress and the roughness, the hardness also plays an important role to measure the surface integrity and has a signi cant effect on the fatigue strength and wear resistance of workpieces [16]. Sun et al [17] presented a new hybrid model to investigate the dynamic hardness distribution with the grinding force and the model was validated by the measurement of the ground workpiece's hardness via grinding experiments under different grinding depths. Zhou et al [18] established the one-dimensional analytic model for surface microhardness in terms of grinding speed, grinder work-table feed speed, grinding depth, incline angle, and de ection angle as process parameters in quick-point grinding ceramics through immune algorithms and orthogonal experiment data.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of swing grinding parameters on machining surface quality of large-width cam

Sun

Dong

Lü

et al. 2022

Int J Adv Manuf Technol

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Large-width Cam has been widely used in high-power marine diesel engines, due to its well strength, wear-resisting, and service life. Unlike the traditional cam, the large-width Cam must be ground by swing grinding process to avoid grinding defects caused by high machining temperature. As the in uence of swing grinding parameters on machining surface quality has not been clearly clari ed, experimental study was discussed in the paper. The orthogonal experiment was designed and based on which the residual stress, surface roughness and hardness were analyzed. The results showed that, the grinding depth and the cam speed, have a relatively great in uence on the residual stress compared with grinding wheel swing frequency and swing amplitude. The grinding wheel frequency has the greatest in uence on the hardness of the cam surface and the increment of it will increase the hardness of the Cam.

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Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of swing grinding parameters on machining surface quality of large-width cam

Sun

Dong

Lü

et al. 2022

Int J Adv Manuf Technol

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“…(10) Several researchers proposed models to determine the temperature distribution in hardened layers of 40Cr and 45 steel with segmented triangular heat sources. (11)(12)(13)(14) Huang and coworkers found a way to minimize the use of lubricants for grind hardening with variable grinding forces for the AISI 5140 alloy metal. (15)(16)(17) These results provide the information required to improve grind hardening to achieve a higher efficiency and a more environmentally friendly manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Generated during Grind Hardening on Hardness and Microstructure of Alloy Metal: Optimal Process to Improve Efficiency

Gao¹,

Liu²,

Huang³

et al. 2020

Sensors and Materials

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Grind hardening is an alternative process to the conventional quenching process. The heat generated during grinding transforms the surface layer of workpieces into the martensitic structure. In this study, we simulated the temperature distribution during grind hardening to investigate the effects of heat on the changes in hardness and microstructure with different regrinding values using AISI 5140 alloy metal. We also compared the experimental results of single-and double-pass grind hardening processes. The results showed that the regrinding value affected the lateral distribution of hardness on the surface of the metal during grind hardening. The process created a softening width between the first and second ground layers, where a decreased softening width indicated the improved efficiency of grind hardening. It was found that double-pass grind hardening yielded the desired grinding results that reduced the softening width. The results of this study obtained using the AISI 5140 alloy metal also suggest that double-pass grind hardening can be used in high-efficiency quenching for various alloy metals.

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“…Pre-stress hardening grinding (PSHG) is a compound grinding technology which can not only harden a workpiece surface, but also control residual stress [1]. The results of experiments indicated that the workpiece surface can obtain a hardening layer with excellent surface integrity after the PSHG process, and therefore has an advantage over traditional grinding and heat treatment [2,3,4]. The metallic materials with lower stacking fault energy generally include the stage of work hardening (WH) and dynamic softening (induced by dynamic recrystallization (DRX)) during hot deformation.…”

Section: Introductionmentioning

confidence: 99%

Controlling Grain Sizes of 42CrMo Steel by Pre-Stress Hardening Grinding

2019

Self Cite

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The dynamic recrystallization behavior of 42CrMo steel during the pre-stress hardening grinding (PSHG) process was investigated at temperatures ranging from 850–1150 °C and pre-stress from 0 MPa to 167 MPa. A coupled grain size model considering different grinding conditions was constructed to research the grinding process. Microstructure analyses showed that the hardening layer exhibits the typical features of dynamic recrystallization (DRX), and the evolution process of microstructure and grain size can be predicted properly by the model. The volume fraction of DRX grains increases with increasing pre-stress and grinding temperature. The critical condition for DRX grains occurring is that with a grinding depth of 150 µm, pre-stress is larger than 67 MPa, while most of the DRX grains occurred when pre-stress is larger than 100 MPa. Furthermore, the relationship between pre-stress and flow stress has been derived. The result shows that flow stress shows a linearly increasing trend, with the increase of pre-stress at the stage of lower strain.

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Research on dynamic hardening effect on workpiece’s hardness distribution with depth of cut

Cited by 8 publications

References 23 publications

Experimental study of the influence of swing grinding parameters on machining surface quality of large-width cam

Experimental study of the influence of swing grinding parameters on machining surface quality of large-width cam

Effects of Heat Generated during Grind Hardening on Hardness and Microstructure of Alloy Metal: Optimal Process to Improve Efficiency

Controlling Grain Sizes of 42CrMo Steel by Pre-Stress Hardening Grinding

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