Analytical Methods for Determining the Static and Dynamic Behavior of Thin-Walled Structures During Machining

Plankovskyy, Sergiy; Myntiuk, Vitalii; Tsegelnyk, Yevgen; Zadorozhniy, Sergiy; Kombarov, Volodymyr

doi:10.1007/978-3-030-58124-4_8

Cited by 15 publications

(3 citation statements)

References 19 publications

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“…13). It should be noted that the proposed method does not take into account the influence of vibrations arising from the machining of non-rigid (thinwalled) parts [34][35][36] and requires further development.…”

Section: Figure 12: Variation Of Machining Parameters: (A) -Variation Of Spindle Speed Along a Trajectory; (B) -Variation Of Feed To The mentioning

confidence: 99%

Numerical Control of Machining Parts From Aluminum Alloys With Sticking Minimization

2021

IJOMAM

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To implement a lot of technological processes in the manufacturing of aircraft parts from aluminum alloys, it is necessary to move the tool at a high speed. High requirements for accuracy and manufacturing quality aircraft parts are provided with application of CNC systems with adaptive control algorithms, in which due the mutual influence of the process parameters provided by the parameters of quality and accuracy. Among a number of factors adversely affecting the quality of high speed machining of aluminum alloys in the paper questions influence Lookahead system distortion predetermined (set up) cutting parameters on the formation conditions of the sticking material to the tool. The paper deals with high-speed machining without the use of a cooling lubricant (coolant). The paper provides a qualitative description of the heat generation variation in the cutting zone. It is concluded that it is necessary to cutting speed variation when feed variating. An experimental investigation of the cutting parameters for the appearance of the effect of the processed material sticking on the tool for alloy 1933 has been carried out. Areas of an unfavorable (negative) combination of parameters leading to the sticking of the material to the tool have been identified. The method of cutting modes adaptation to contour feed rate variation on curvilinear areas of a processing trajectory is proposed. The analysis of variation in cutting parameters with the partial deceleration of the spindle simultaneously with the deceleration of feed when moving along the path is carried out. The possibility of excluding the sticking of the processed material to the tool when variation the rotation speed by 20…30% is shown. The proposed method is implemented in the CNC system and used for manufacturing of "Antonov" company airplane parts.

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Section: Figure 12: Variation Of Machining Parameters: (A) -Variation Of Spindle Speed Along a Trajectory; (B) -Variation Of Feed To The mentioning

confidence: 99%

Numerical Control of Machining Parts From Aluminum Alloys With Sticking Minimization

2021

IJOMAM

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“…According to research [7,8], installation of repair patches is considered an effective method for the repair of defects such as dents, failures of bearing skins and delaminations in the metal and composite panel structures. High physico-mechanical characteristics of the modern polymeric composite materials (PCM) [9][10][11] determine successful use of the composite patches for the repair of both polymeric and metal structures [12,13]. The composite patch can also have potential applications in constructing electromagnetic nanocomposites or intelligent materials, as there is carbon materials in the composite [14,15].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Temperature–Time Regime of Curing of Composite Patch on Repair Process Efficiency

et al. 2021

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Repair procedures with the use of composite patches are considered to be the most effective among the current technologies of repair of the structures of various applications. In the process of moulding-on of a patch made of polymeric composite material by means of curing, technological stresses arise in the patch. Determination of residual technological stresses is a priority task for the modelling of the repair process. Reduction of residual stresses can be achieved by optimization of the mode of repair patch curing. For meeting this objective, the method for determination of technological stresses, which arise in the structure under repair in the process of curing of a composite patch, has been developed. The method takes into account the shrinkage, change in physico-mechanical characteristics, rheological processes occurring in the binder during moulding process, and determination of stresses in the structure under repair at any time. Therefore, premature failure of the repair joint at the stage of repair can be avoided. It is shown that the method adequately describes the level of deformations and stresses in the structure being repaired at the stage of heating and holding of the composite patch. Increase in the moulding temperature leads to a reduction in residual stresses in the structure under repair. However, current stresses at the stages of heating and temperature holding are increased significantly. Reliability of assumptions and developed method is confirmed by the comparison with the experimental data. The obtained experimental graph of total deformation of the composite patch allowed us to clearly determine the moment of residual stress occurrence in the structure under repair. This moment matches quite exactly (with the discrepancy not exceeding 5 min) the gel point determined analytically based on dependence of the degree of curing on the moulding mode. Consequently, the research together with the results previously obtained allows making an integrated choice of geometric parameters of the repair composite patch and temperature–time regime of its curing in order to ensure the specified level of strength and stiffness of the structure under repair.

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“…Modern technological equipment, which implements processes such as high speed machining [1,2], laser cutting [3,4], laser welding and cladding [5,6], laser deburring [7,8] etc. are cyber-physical systems.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Required Discreteness of Interpolation Movement Parameters in Cyber-physical Systems

Kombarov

Tsegelnyk

Plankovskyy

et al. 2021

Period. Polytech. Mech. Eng.

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Improving the accuracy, reliability, and performance of cyber-physical systems such as high-speed machining, laser cutting, welding and cladding etc. is one of the most pressing challenges in modern industry. CNC system carries out data processing and significantly affect on accuracy of operation such equipment. The paper considers the problem of controlled axes motion differential characteristics data processing in the internal representation of the discrete space of the CNC system. Equations for determining the required discreteness of the differential characteristics position and resolution, such as the speed, acceleration, and jerk are proposed. For the most widely used CNC equipment specific discreteness and resolution values have been determined.

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Analytical Methods for Determining the Static and Dynamic Behavior of Thin-Walled Structures During Machining

Cited by 15 publications

References 19 publications

Numerical Control of Machining Parts From Aluminum Alloys With Sticking Minimization

Numerical Control of Machining Parts From Aluminum Alloys With Sticking Minimization

Effects of the Temperature–Time Regime of Curing of Composite Patch on Repair Process Efficiency

Investigation of the Required Discreteness of Interpolation Movement Parameters in Cyber-physical Systems

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