Accurate and fast measurement of specific cutting force coefficients changing with spindle speed

Grossi, Niccolò

doi:10.1007/s12541-017-0137-x

Cited by 27 publications

(14 citation statements)

References 19 publications

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“…Dynamic equations for the rotor, the stator and the system base of the passive RTC induction motor are shown in Eqs. (1,2,3), respectively. In addition, Eq.…”

Section: Mathematical Modelingmentioning

confidence: 99%

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RTC (reaction torque compensated) induction motor and its open-loop control

Ahn

2019

JMST Adv.

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Rapid change of the rotating speed of an induction motor causes large reaction torque or excessive vibration of the system base. This paper proposes a passive reaction torque compensated (RTC) induction motor considering the dynamic characteristic of open-loop speed control with a variable frequency drive. RTC mechanism converts the reaction torque into the dissipative inertial energy of the rotary stator and the potential energy of the torsion spring torque so that a part of the reaction torque or the spring torque is transmitted to the system base. First, dynamic equation and simulation model for the RTC induction motor are introduced and verified with experiments. The acceleration response of an induction motor with variable speed drive is approximated as first-order ordinary differential equation. Then, the RTC mechanism such as spring and additional inertia are designed considering derived acceleration response or torque profile. Then, an experimental setup and its control system for the RTC induction motor are built. Finally, effectiveness of the RTC induction motor is verified comparing open-loop speed control of both RTC and conventional induction motor. Keywords Induction motor • Variable speed control • Reaction torque compensation (RTC) Abbreviations c m, c s, c b Damping of rotor, stator and system base d 0 Initial deflection of tension spring at balance position F Force caused by tension spring i rq, i sq q-component of rotor and stator current J m, J s, J b Inertia of rotor, stator and system base K Stiffness of tension spring k s, k b Stiffness of equivalent stator and system base springs L 0 Undeformed length of tension spring L m, L r Magnetizing and rotor inductance p Number of poles R Distance from center of motor to pin of attached spring R r Rotor resistance r Radius of the pins T e, T L Motor and load torque T ks Torque generated by spring between stator and base T Trans Transmitted torque to the system base γ m Rotor acceleration η m, τ m Motor constants λ rd d-component of rotor flux θ m, θ s, θ b Rotary angle of rotor, stator, system base ω Frequency ω d, ω m Rotating flux and rotor speed

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“…Dynamic equations for the rotor, the stator and the system base of the passive RTC induction motor are shown in Eqs. (1,2,3), respectively. In addition, Eq.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…AC induction motors are the most common motors in the world and used in industrial fields as well as home appliances [1][2][3][4] due to their unique advantages such as simple and rugged design, low-cost, low maintenance and direction connection to an AC-power source [5].…”

Section: Introductionmentioning

confidence: 99%

RTC (reaction torque compensated) induction motor and its open-loop control

Ahn

2019

JMST Adv.

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“…Both the papers did not consider the small deformation of the ceramic materials. Grossi [13] studied the specific cutting force coefficients in the entire speed range by a single milling test through aluminum coefficients traditional approach to validate the efficiency and effectiveness of the proposed technique, which is not adaptive in high-temperature environment. Werner [14] employed the electromagnetic model with an electromagnetic moment to calculate radial and angular electromagnetic stiffnesses, the mass moment of inertia, and the gyroscopic effect of the rotor, but magnetic radical force is not considered.…”

Section: Introductionmentioning

confidence: 99%

Research on Vibration Characteristics of a Ceramic Spindle Based on the Reverse Magnetic Effect

Zhang

Wang

Shi

et al. 2019

Shock and Vibration

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The electromagnetic radial force about a ceramic spindle affects the spindle dynamic, which determines the quality of processing. Using a Timoshenko beam unit to build the dynamic model for the ceramic spindle, the dynamic characteristic of an angular contact ball bearing is analyzed using a nonlinear bearing model. The electromagnetic magnetization model was established based on Maxwell’s theory to calculate electromagnetic magnetic density and radial force. The influence about the reverse magnetic field characteristic of the ceramic rotating shaft and dynamic stiffness of the contact ball bearing on the dynamic phenomena of the spindle is analyzed, which is verified by experiments. The results show that the magnetic effect produced by the reverse magnetic of ceramic rotation shaft has a great influence on the electromagnetic radial force. Compared with the paramagnetic effect of the metal shaft, the dynamic characteristics of the spindle can be significantly improved. Considering the coupling relationship between the radial force of the magnetic field and the bearing contact force, dynamic stiffness, and other factors, the accuracy of the model simulation is highly consistent with the test results. In particular, the ceramic spindle model has been successful in predicting with high accuracy and is suitable for multiple extreme working conditions. The parameters, such as initial eccentricity of the rotor, bearing preload, and rotating speed, can be adjusted to restrain the vibration of spindle. The ceramic spindle model provides a theoretical basis for the dynamics development of a high-speed spindle.

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“…Then, the experiments set up to verify the feasibility of the separation effect in the SVC process using a transient cutting force signal [31] are presented. Based on the separation effect, the cutting force and cutting temperature reductions are validated by measuring using dynamometers [32] and tool–workpiece thermocouples [33]. Finally, surface integrity is discussed to prove the feasibility of the SVC method in cutting difficult-to-machine materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on a “Snake-Type” Vibration Cutting Method for Cutting Force and Cutting Heat Reductions

2019

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Cutting is the foundation of manufacturing in industry. The main cutting objects include metals, ceramics, glasses, compositions, and even biological materials such as tissues and bones. The special properties of each material such as hardness, ductility, brittleness, and heat conductivity lead to either a large cutting force or a high cutting temperature. Both of these factors result in poor machinability due to rapid tool wear or break or unsatisfactory surface integrity of the material finishing surface using the conventional cutting (CC, conventional cutting) types. In nature, snakes have their own way of reducing heat accumulation on their body when moving on the hot desert surface. They move forward along an “S”-type path, so that the bottom of their body separates from the desert intermittently. In this way, the separation interval both reduces the cutting heat accumulations and effectively achieves cooling by allowing the air to go through. In addition, the acceleration of Odontomachus monticola’s two mandibles when striking a target can reach 71,730 g m/s2 within 180 ms, which can easily break the target surface by the transient huge impact. Therefore, based on a snake’s motion on the desert surface and Odontomachus monticola’s striking on the target surface, respectively, an ultrasonic-frequency intermittent cutting method, also called “snake-type” vibration cutting (SVC, snake-type vibration cutting), was proposed in this study. First, its bionic kinematics were analyzed, then the SVC system’s design was introduced. Finally, cutting experiments were conducted on a common and typical difficult-to-cut material, namely titanium alloys. Cutting force, cutting temperature, and the surface integrity of the material finishing surface were measured, respectively. The results demonstrated that, compared to conventional cutting methods, SVC achieved a maximum of 50% and 30% reductions of cutting force and cutting temperature, respectively. Moreover, the surface integrity was improved both in surface roughness and residual stress state.

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Accurate and fast measurement of specific cutting force coefficients changing with spindle speed

Cited by 27 publications

References 19 publications

RTC (reaction torque compensated) induction motor and its open-loop control

RTC (reaction torque compensated) induction motor and its open-loop control

Research on Vibration Characteristics of a Ceramic Spindle Based on the Reverse Magnetic Effect

Experimental Study on a “Snake-Type” Vibration Cutting Method for Cutting Force and Cutting Heat Reductions

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