Evaluation of the influence of different inner cores on the dynamic behavior of boring bars

Thorenz, Benjamin; Friedrich, Markus; Westermann, Hans-Henrik; Döpper, Frank

doi:10.1016/j.procir.2019.03.287

Cited by 13 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Outside of these se ings, almost throughout the rest of the range the roughness values for all tools intermingle and are similar to each other. For the PC + SBR tool, for a cu ing speed of vc = 116 m/min, an apparent improvement in machined surface quality can be seen as a decrease in the What is more, other researchers have claimed that not only the mechanical properties of the boring bar depend on the limit of stability but also its fixation on the machine tool [3].…”

Section: Static Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Operating Properties of Deep Hole Boring Tools with Modified Design

Kępczak,

Bechciński,

Rosik

2024

Materials

View full text Add to dashboard Cite

This paper presents the results of research work on the revised design of a deep hole boring tool. The study was divided into three stages: theoretical, experimental and operational. In the theoretical part, a 3D model of the actual boring bar was created, which was subjected to strength tests using the Finite Element Method (FEM), and then prototypes of new deep hole boring tools were made with structural modifications to the shank part of the tool. For the polymer concrete core of a shank, there was a 14.59% lower displacement, and for the rubber-doped polymer concrete (SBR—styrene butadiene rubber) core of a shank there was a 4.84% lower displacement in comparison to the original boring bar. In the experimental part of the study, the original boring bar and the prototypes were subjected to experimental modal analysis and static analysis tests to compare dynamic and static properties. In the operational part of the study, boring tests were carried out for various workpiece materials, during which the basic parameters of the surface geometric structure (SGS), such as roughness Ra and Rz, were studied. Despite the promising preliminary results of the theoretical and experimental studies, using the described modifications to the boring bar is not recommended.

show abstract

Section: Static Propertiesmentioning

confidence: 99%

“…Forced vibration occurs as a result of an external impulse or periodically acting excitation force. Self-excited vibration, unlike forced vibration, is not caused by an external disturbance but by a dynamic interaction between the mechanical system and the machining process [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Operating Properties of Deep Hole Boring Tools with Modified Design

Kępczak,

Bechciński,

Rosik

2024

Materials

View full text Add to dashboard Cite

show abstract

“…Zhang et al [6,10] conducted research on boring bars made of compliant materials, including tapered boring bars made of composite materials, which have been less studied by other teams. Thorenza et al [11] investigated the effect of different boring bar cores on the dynamic characteristics of boring bars using finite element simulations and experiments. Hayati et al [12] developed a boring bar with longitudinal pins pressed into the cutter body.…”

Section: Introductionmentioning

confidence: 99%

Equivalent linearization of hyperelastic rubber rings in dynamic vibration absorber boring bar and simulation of its dynamic properties

Shi,

Ma,

et al. 2024

Eng. Res. Express

View full text Add to dashboard Cite

A slight perturbation in high-speed precision cutting could cause violent vibration of boring bars, resulting in unexpected wear and failure of the structures. In this paper, the dynamical characteristic of a boring bar with a dynamic vibration absorber (DVA) is investigated. Considering that the nonlinear characteristics of the rubber ring play a significant role in improving the capacity of DVA, we proposed an equivalent linearization method for modeling hyperelastic rubber rings based on the experimental data of uniaxial tensile test. The relationship between the stiffness of rubber rings and the precompression parameter δ is established for two types of rubber. The equivalent linearization model shows good accuracy and calculation efficiency while the mass of the DVA is confined to a narrow space and the assumption of small strain is inherently satisfied. Numerical results show that the time cost of the equivalent linearization model is only 5% of the full hyperelastic model. Furthermore, the effect of different spring stiffnesses and damping on the dynamic characteristics of the boring bar is compared by using the equivalent linearization model, and the vibration peak of the DVA boring bar is found to be reduced about 45%. Our findings establish a simplified modeling scheme for choosing rubber rings in design of dynamic vibration absorbers with acceptable accuracy and little time cost, which could also give some reference for modeling of metal rubber and gel-like materials.

show abstract

“…14 Several studies have recently presented the effect of vibrations on the cutting tool in turning operations and how to reduce these vibrations to get better performance. Some of these studies have focused on adding materials that have vibration-damping properties to the cutting tool, such as carbon fiber, 35 polyurethane, nitride-butadiene rubber and butyl rubber, 36 or foamed aluminum. 37 Impact dampers have also been used to dampen vibration in the boring bar by adding a double copper damper to the cutting tool.…”

Section: Introductionmentioning

confidence: 99%

A new design of boring bar using TiNi3 alloy to reduce vibration in turning operations

Akdeniz

Arslan

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

In turning operations, vibration is a significant problem that leads to an imperfect surface, cutting tool damage, and unstable production. Vibration affects not only the workpiece’s surface quality, but also the cutting tool life, and ultimately the overall process cost. Since Shape Memory Alloys (SMA) has a very high vibration damping capacity, the effect of using TiNi3 alloy as the turning tool holder material is investigated in this paper. The tool holder vibrations are investigated analytically and numerically in both external and internal turning operations. The analytical study utilizes the Laplace Transformation Method to find the natural frequency and the beam’s displacement as a function of time and the longitudinal axis. The numerical study is performed using transient and Modal Analysis using ANSYS software. A comparison of the analytical and numerical results shows that they were very close to each other. The numerical study shows that TiNi3 alloy decreases vibration amplitude and acceleration for external and internal turning operations. It is shown that the use of TiNi3 alloy in the turning cutting tools decrease the vibration acceleration amplitudes by 43.1% and 40.2% for internal and external turning operations, respectively. Additional improvement in the performance of the internal turning cutting tool is achieved by presenting a new model of the boring bar that depends on the integrating of TiNi3 alloy and carbide material. Optimization of five steps is made to obtain the optimal design of the presented model. The new model shows that the optimized boring bar decreases the vibration acceleration by 60.2% compared to the commercial boring bar. Therefore we strongly recommend it for manufacturing turning tool holders.

show abstract

Evaluation of the influence of different inner cores on the dynamic behavior of boring bars

Cited by 13 publications

References 6 publications

Operating Properties of Deep Hole Boring Tools with Modified Design

Operating Properties of Deep Hole Boring Tools with Modified Design

Equivalent linearization of hyperelastic rubber rings in dynamic vibration absorber boring bar and simulation of its dynamic properties

A new design of boring bar using TiNi3 alloy to reduce vibration in turning operations

Contact Info

Product

Resources

About