Integration of thermo-dynamic spindle and machining simulation models for a digital machining system

Li, Hongqi; Shin, Yung C.

doi:10.1007/s00170-008-1394-8

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…In order to comply with the requirements, new solutions must therefore be implemented, already at the stage of designing technologies for producing these parts, e.g. through proper modelling, prediction or simulation techniques [10,15,26].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Typical Structures of Dynamic Systems of Machining of Elastic-Deformable Shafts With Low Rigidity

Świć¹,

Gola²,

Wołos³

2018

Adv. Sci. Technol. Res. J.

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In the process of machining of shafts with low rigidity it is difficult to achieve the required parameters of accuracy of form and dimensions and of surface quality. Under specific conditions, low inherent rigidity and the relatively low shaft rigidity, compared to the rigid assemblies of the machine tool, cause vibrations. The paper presents a 7-level hierarchical mathematical model of the system of longitudinal turning and a mathematical model of the dynamic system of machining of shafts with low rigidity in the elastic-deformable state, taking factors interfering with and destabilising the process of shaft machining into account. For the purpose of validation of the models, a study was conducted on the conformance of the dynamic characteristics of the mathematical model with the actual object. The study was realized on specially designed experimental workstation for the study of characteristics of the dynamic system of turning of elastic-deformable shafts with low rigidity. The experiment demonstrated a high conformance of the dynamic characteristics of the mathematical model with the actual object.

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Section: Introductionmentioning

confidence: 99%

Analysis of Typical Structures of Dynamic Systems of Machining of Elastic-Deformable Shafts With Low Rigidity

Świć¹,

Gola²,

Wołos³

2018

Adv. Sci. Technol. Res. J.

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“…To reduce the level of residual stress in lowrigidity parts, depending on their physico-mechanical properties, we can apply annealing or tempering [2,4,5,14]. One of the methods of ensuring the maintenance of shape is heat treatment at rigid fixing of the positioning of the semifinished product.…”

Section: Introductionmentioning

confidence: 99%

Method of Achieving Accuracy of Thermo-Mechanical Treatment of Low-Rigidity Shafts

Świć¹,

Draczew²,

Gola³

2016

Adv. Sci. Technol. Res. J.

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The paper presents a method combining the processes of straightening and thermal treatment. Technological processes with axial strain were considered, for the case of heated material and without its heating. The essence of the process in the case of heated material consisted in the fact that if under tension all longitudinal forces in the first approximation are uniform -the same strains are generated. The presented technological approach, aimed at reducing the curvature of axial-symmetrical parts, is acceptable as the process of rough, preliminary machining, in the case of shafts with the ratio L/D≤100 (L -shaft length, d -shaft diameter) and without a tendency of strengthening. To improve the accuracy and stability of geometric form of low-rigidity parts, a method was developed that combines the processes of straightening and heat treatment. The method consists in that axial strain -tension, is applied to the shaft during heating, and during cooling the product is fixed in a fixture, the cooling rate of the shaft being several-fold greater than that of the fixture. A device is presented for the realisation of the method of controlling the process of plastic deformation of lowrigidity shafts. In the case of the presented device and the adopted calculation scheme, a method was developed that permits the determination of the length of shaft section and of the time of its cooling.

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“…Considering the dynamic effects due to high rotational speed and elastic deformations, Gagnol et al 23 predicted a new dynamic stability lobe diagram by integrating the modeled speed-dependent spindle transfer function in the chatter vibration stability approach of Altintas and Budak. Li and Shin 24 et al integrated the high-speed spindle mechanical–thermal coupling model with cutting process model and preliminarily proposed the basic framework of digital machining system. Holkup et al 25 presented a finite element method–based thermo-mechanical model of spindles with rolling bearings.…”

Section: Introductionmentioning

confidence: 99%

Stability-based selection of cutting parameters to increase material removal rate in high-speed machining process

Cao

Zhou

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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The reasonable selection of cutting parameters is of great significance to improve the productivity in high-speed machining process. In this article, a stability-based selection method of cutting parameters is proposed to increase material removal rate in high-speed machining process. First, the coupled dynamics of the high-speed spindle system and machining process is modeled. Then, the interaction mechanism between the spindle-tool system and the cutting process is investigated. Based on the process stability and surface quality of workpiece, a cutting parameter selection method is proposed from the perspective of machining stability. In order to select reasonable spindle speed and depth of cut, the lower bound of chatter stability lobe diagram and surface finish are taken as constraints, and the maximum material removal rate is set as the target. The proposed method is applied to the machining of the front face of a gearbox cover, which is made of Aluminum-7050. The axial depth of cut and spindle speed are chosen reasonably with the increase in machining efficiency by about 133%.

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Integration of thermo-dynamic spindle and machining simulation models for a digital machining system

Cited by 14 publications

References 36 publications

Analysis of Typical Structures of Dynamic Systems of Machining of Elastic-Deformable Shafts With Low Rigidity

Analysis of Typical Structures of Dynamic Systems of Machining of Elastic-Deformable Shafts With Low Rigidity

Method of Achieving Accuracy of Thermo-Mechanical Treatment of Low-Rigidity Shafts

Stability-based selection of cutting parameters to increase material removal rate in high-speed machining process

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