Modeling and research of temperature distribution in surface layer of titanium alloy workpiece during AEDG and conventional grinding

Materialwissenschaft Werkst

Konstantynowicz

2017

Self Cite

The heat generation process during the abrasive electrodischarge grinding (AEDG) process is one of the most critical sub processes, sometimes settling the critical issue. Thus the need for precise evaluation of this process which can be done in different ways, exemplary with using the infrared (IR) camera, which in turn seems to be flexible and comfortable in use. But precise and reliable measurement with using an infrared camera is not so straightforward due to the problem of camera calibration. Even for relative expensive equipment of this kind, the self‐calibration is performed in a way which is not fully adequate for precise measurement. Here we propose to apply a precisely heated etalon as radiation temperature standard. The whole method is based upon comparison of two independent measurements, one of them treated as the reference standard due to the high precision and reliability of the thermocouple measurements. This comparison, accomplished with the strong help of numerical procedures, is performed between two surfaces, not points like during bolometric‐like measurements, taking into account specific generation of the thermal picture with using focal plane array (FPA) infrared sensor.

Section: Discussionmentioning

confidence: 99%

Calibration of infrared (IR) camera for heat generation monitoring during abrasive electrodischarge grinding (AEDG)

Materialwissenschaft Werkst

Konstantynowicz

2017

Self Cite

Int J Adv Manuf Technol

“…This can be explained by the use of grinding wheels with a metal bond, which removes part of the heat generated in the grinding zone. According to the results presented by Gołąbczak in [41], in the case of dry grinding of Ti6Al4V titanium alloy, the average temperature in the machining zone is about 550-600°C. This temperature is much lower than the melting point of this alloy (Table 2).…”

Section: Geometrical Microstructure Of the Surfacementioning

confidence: 99%

“…The detailed description of the nature of wear of grinding wheels used in this study, including the assessment of the material removal rate and analysis of the grinding temperature, can be found in previous experimental works by Gołąbczak et al, i.e. during comparative studies of the surface layer temperature in grinding process [38,39], cutting ability evaluation of grinding wheels [40] and research of temperature distribution in surface layer of titanium alloy workpieces [41].…”

Section: The Materials and The Grinding Wheelmentioning

confidence: 99%

The estimation of machining results and efficiency of the abrasive electro-discharge grinding process of Ti6Al4V titanium alloy using the high-frequency acoustic emission and force signals

Sutowski

Święcik

2017

The paper presents the results obtained for abrasive electro-discharge grinding (AEDG) of Ti6Al4V titanium alloy with the use of super hard grinding wheels of cubic boron nitride with a metal bond. The experimental investigations were focused on process monitoring for sharp and worn grinding wheels. For the evaluation of the grinding process, the grinding force amplitude and a few descriptors of the high-frequency stress waves were investigated in both time and frequency domains. The results show that during the AEDG, specific elastic waves are generated. Since these waves have characteristic amplitudes, frequencies, and other different descriptors dependent on the current grinding wheel cutting ability and discharge parameters, they can be applied to estimate a statistically significant regression function. For each measurement signal, a few statistical features are calculated and used as input for data selection and classification procedures. Registration and classification of forces and acoustic emission signals can be used to analyse the abrasive electro-discharge grinding process and allow for the determination of the machining results and the lifespan of super hard grinding wheels.

“…Due to the unfavourable effect of the influence of this flux on properties of the surface layer of grinded aircraft alloys it is purposeful to continue further research in this field. The research should investigate the modeling of the temperature distribution in the surface layer in the abrasive electrodischarge grinding process and assessment of internal stresses in surface layer [5][6][7]. process the best stereometric surface parameters have been obtained for nickel alloys like Hastelloy X (S a = 0.966 mm, S ku = 3.675, S sk = -0.056) and Inconel 617 (S a = 1.176 mm, S ku = 3.654, S sk = 0.110) compared to titanium 5553 beta alloy (S a = 1.279 mm, S ku = 4.544, S sk = 0.372) and magnesium AZ31 alloy (S a = 1.661 mm, S ku = 4.844, S sk = 0.286).…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…The mechanism of removal of machining allowance in abrasive electrodischarge grinding is a result of the synergy of spark discharges taking place between the metal bond of the grinding wheel and the surface layer of the machining workpiece and the machining of abrasive grains of the cutting surface of the grinding wheel (CSGW). Available publications and our own articles indicate that hybrid methods of machining, including abrasive electrodischarge grinding, are the most suitable for solving all the problems appearing in processes of working hard machinable construction materials, including alloys used in the aircraft industry [1][2][3][4][5][6][7][8]. Involvement of different forms of energy in the process of reduction machining allowances increases machining efficiency and quality of machined surfaces.…”

Section: Introductionmentioning

confidence: 99%

Investigations of surface layer temperature and morphology of hard machinable materials used in aircraft industry during abrasive electrodischarge grinding process

Święcik

Materialwissenschaft Werkst

et al. 2018

Self Cite

In this work the results related to the influence of selected electrical parameters of the abrasive electrodischarge grinding process on the surface layer temperature and morphology of machined samples in comparison to the conventional grinding method are presented. The basis of this work has been investigations of the deep grinding of surfaces of the samples made of titanium 5553 β, Inconel 617, Hastelloy X and magnesium AZ31 using a cubic boron nitride (CBN) grinding wheel with metallic binding agent. For the comparative evaluation of the conventional grinding and abrasive electrodischarge grinding, measurements of the specific grinding energy, temperature on the surface layer (at the contact of the grinding wheel‐workpiece) and geometric structure of the surface layer have been used.