Modal Analysis and Experimental Plan of Thin-Walled Workpieces in Turning Cutting Process

Mehdi, Kamel

doi:10.1109/icmae50897.2020.9178874

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…The desire to reduce the amount of materials used in the construction of mechanisms and machines, as well as the functional uses of some parts, makes it necessary to produce precise low-stiffness parts [ 1 , 2 , 3 , 4 , 5 , 6 ]. Rotationally symmetrical parts (shafts, turbine rotors, pumps, lead screws, etc.)…”

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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“…The specificity of low-rigidity shafts’ processing makes it difficult to obtain certain parameters of the shape accuracy, dimensions, and surface quality [ 15 , 16 ]. The low stiffness of the shaft, as compared to the rigid assemblies of the machine tool, causes vibrations under certain conditions [ 17 ].…”

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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“…Among the large variety of low-rigidity rotating parts, a special place belongs to thin-walled parts, which are characterized by specific stiffness-to-weight ratios [ 10 ]. The dimensions of thin-walled parts are expressed by the dimensionless coefficients β t = H / D > 15 and α t = d / D ≤ 0.9 (where H , D , and d stand for the height and external and internal diameters of cylindrical surfaces, respectively) [ 11 ]. Although machining of this type of parts is important from the point of view of the current market needs, the literature does not offer much information on the control of elastic displacements during machining of thin-walled parts, and the existing studies mainly go as far as describing various tools and devices using steady rests [ 12 ], tool holders, frictionally damped rotary boring bars [ 13 ], multi-tool holders or devices for double-sided machining, which provide additional support and only help to reduce the deformation of the part, and not to control elastic deformation [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

An Investigation into the Effect of Electro-Contact Heating in the Machining of Low-Rigidity Thin-Walled Micro-Machine Parts

et al. 2021

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Low-rigidity thin-walled parts are components of many machines and devices, including high precision electric micro-machines used in control and tracking systems. Unfortunately, traditional machining methods used for machining such types of parts cause a significant reduction in efficiency and in many cases do not allow obtaining the required accuracy parameters. Moreover, they also fail to meet modern automation requirements and are uneconomical and inefficient. Therefore, the aim of provided studies was to investigate the dependency of cutting forces on cutting parameters and flank wear, as well as changes in cutting forces induced by changes in heating current density and machining parameters during the turning of thin-walled parts. The tests were carried out on a specially designed and constructed turning test stand for measuring cutting forces and temperature at specific cutting speed, feed rate, and depth of cut values. As part of the experiments, the effect of cutting parameters and flank wear on cutting forces, and the effect of heating current density and turning parameters on changes in cutting forces were analyzed. Moreover, the effect of cutting parameters (depth of cut, feed rate, and cutting speed) on temperature has been determined. Additionally, a system for controlling electro-contact heating and investigated the relationship between changes in cutting forces and machining time in the operations of turning micro-machine casings with and without the use of the control system was developed. The obtained results show that the application of an electro-contact heating control system allows to machine conical parts and semi-finished products at lower cutting forces and it leads to an increase in the deformation of the thin-walled casings caused by runout of the workpiece.

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Modal Analysis and Experimental Plan of Thin-Walled Workpieces in Turning Cutting Process

Cited by 3 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

An Investigation into the Effect of Electro-Contact Heating in the Machining of Low-Rigidity Thin-Walled Micro-Machine Parts

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