Surface Texture after Turning for Various Workpiece Rigidities

Dobrzyński, Michał; Mietka, Karolina

doi:10.3390/machines9010009

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…Rotationally symmetrical parts (shafts, turbine rotors, pumps, lead screws, etc.) account for about 34% of all parts used in the engineering industry, of which 12% are classified as low-stiffness parts [ 7 , 8 , 9 , 10 ]. Such parts are characterized by disproportionate overall dimensions and low stiffness in specific directions and sections [ 5 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Compliance of a Technological System on the Machining Accuracy of Low-Stiffness Shafts in the Grinding Process

Świć

Gola

2023

Materials

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This paper reports the results of research on the influence of the compliance of the technological system used in grinding low-stiffness shafts on the shape accuracy of the workpieces. The level of accuracy achieved using passive compliance compensation was assessed, and technological assumptions were formulated to further increase the shape accuracy of the low-stiffness shafts obtained in the grinding process. Taking into account the limitations of passive compliance compensation, a method for the active compensation of the compliance of the elastic technological system during the machining process was developed. The experiments showed that the accuracy of grinding was most effectively increased by adjusting the compliance and controlling the bending moments, depending on the position of the cutting force (grinding wheel) along the part. The experimental results were largely consistent with the results of the theoretical study and confirmed the assumptions made. Adjusting the compliance in the proposed way allows for the significant improvement in the accuracy and productivity of machining of low-stiffness shafts.

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Section: Introductionmentioning

confidence: 99%

Influence of the Compliance of a Technological System on the Machining Accuracy of Low-Stiffness Shafts in the Grinding Process

Świć

Gola

2023

Materials

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“…[ 1 , 2 ]. It is estimated that 12% of all the parts used in industries are shafts of a low stiffness [ 3 , 4 ]. They are used in the aviation industry (resilient, flexible, and torsion shafts, springs, and screws) [ 5 ], the tool industry (various types of instruments, mechanisms, precision and special tools, drills, reamers, taps, and boring bars) [ 6 ], machine industry (shafts, turbine and pump rotors, and lead screws) [ 7 , 8 ], in agricultural machinery (tractor and combine shafts) [ 9 ], the automotive industry [ 10 ], elements of photovoltaic installations [ 11 ], and others.…”

Section: Introductionmentioning

confidence: 99%

Technological Methods for Controlling the Elastic-Deformable State in Turning and Grinding Shafts of Low Stiffness

et al. 2022

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The article presents original technological methods that allow the improvement of the accuracy of the turning and grinding of elastic-deformable shafts by increasing their stiffness by controlling the state of elastic deformations. In particular, the adaptive control algorithm of the machining process that allows the elimination of the influence of the cutting force vibration and compensates for the bending vibrations is proposed. Moreover, a novel technological system, equipped with the mechanism enabling the regulation of the stiffness and dedicated software, is presented. The conducted experimental studies of the proposed methods show that, in comparison with the passive compliance equalization, the linearization control ensures a two-fold increase in the shape accuracy. Compared to the uncontrolled grinding process of shafts with low stiffness, the programmable compliance control increases the accuracy of the shape by four times. A further increase in the accuracy of the shape while automating the processes of abrasive machining is associated with the proposed adaptive control algorithm. Moreover, the initial experiments with the adaptive devices prove that it is possible to reduce the longitudinal shape inaccuracy even by seven times.

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“…The high-frequency component is mainly conditioned by changes in machining allowance, changes in material hardness and other complex phenomena occurring during the turning process [ 22 ]. The basic high-frequency component compensation method is to control the elastic deformations of the turning process system [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Identification of Frequency Characteristics and Control Signals of a Dynamic System in the Process of Turning

Świć

Gola

2021

Materials

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The article presents the results of the experimental validation of the developed static, time and frequency characteristics under interference and longitudinal feed control of a dynamic system in the process of turning axisymmetric parts. The experiments were conducted on a test bench, consisting of a 16B16P center lathe, a measuring system and a PC with a measurement card. The experiments were carried out to verify the assumptions of the baseline model of the turning process. As part of the study, we determined the static characteristics of the machining process, the time characteristics of the object under interference and under longitudinal feed rate control, and the frequency characteristics of the machine tool system under longitudinal feed rate control. During the experiments, we recorded the observed input and output signal curves and the observed characteristics of the interferences acting on the object, as well as the numerical values of the parameters of the equations describing the model, and in particular the gain of the elastic system, which is difficult to determine by analytical methods. The positive results of the experiments confirm the effectiveness of the proposed models and their usefulness for automation of machining processes.

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Surface Texture after Turning for Various Workpiece Rigidities

Cited by 9 publications

References 11 publications

Influence of the Compliance of a Technological System on the Machining Accuracy of Low-Stiffness Shafts in the Grinding Process

Influence of the Compliance of a Technological System on the Machining Accuracy of Low-Stiffness Shafts in the Grinding Process

Technological Methods for Controlling the Elastic-Deformable State in Turning and Grinding Shafts of Low Stiffness

Theoretical and Experimental Identification of Frequency Characteristics and Control Signals of a Dynamic System in the Process of Turning

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