Modelling of Cutting Force and Deflection of Medical Needles with Different Tip Geometries

PVDF sensor is a sensor that is often used to measure force, strain, vibration and heat. In this study, PVDF sensors with surface polarization are used to detect cutting forces on the machine. The PVDF sensor that has been polarized on the surface is placed in the chuck part of the engine. Measuring instrumen for testing and calibrating PVDF sensors is oscilloscope with increased loading and reduced axial and tangential directions. After the calibration process, the PVDF sensor was used to measure cutting force on drilling machine, and then the results were compared with the PCB piezotronics force sensor. The PVDF sensor output signal is measured and studied for its voltage using an oscilloscope, where the output signal is compared to the weight given to the PVDF sensor. From the results of these tests indicate that the maximum deviation in axial loading is 0.32V while the tangential loading is 0.31VKeywords. PVDF sensor, Surface polarization, Drilling machine, Cutting force

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Determination of cutting force of roll-formed section in shaped dies-knife guillotine

Blanking productions in mechanical engineering (press forging, foundry and other productions) ◽

10.36652/1684-1107-2020-18-8-373-376 ◽

2020 ◽

pp. 373-376

Author(s):

S.V. Povorov ◽

D.V. Egorov ◽

D.S. Volgin

Keyword(s):

Cutting Force ◽

Cutting Process ◽

Sheet Blank

The change in cutting force in the cutting process of roll-formed section in shaped dies-knife guillotine is studied. It is established that to calculate the cutting force in shaped guillotine, one can use formulas to determine the cutting force of sheet blank on conventional straight knives guillotine.

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Factors influencing cutting force in tobacco stem cutting tests

JOURNAL OF HUNAN AGRICULTURAL UNIVERSITY ◽

10.3724/sp.j.1238.2013.00213 ◽

2014 ◽

Vol 39 (2) ◽

pp. 213-216 ◽

Cited By ~ 1

Author(s):

Kui CHEN ◽

Song-lin SUN ◽

Jun-zheng LI ◽

Qian TAN ◽

Ming-tao XIAO ◽

...

Keyword(s):

Cutting Force ◽

Stem Cutting ◽

Factors Influencing ◽

Tobacco Stem

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3D Finite Element Simulation for Turning of Hardened 45 Steel

Recent Patents on Engineering ◽

10.2174/1872212112666180522082717 ◽

2019 ◽

Vol 13 (2) ◽

pp. 181-188

Author(s):

Meng Liu ◽

Guohe Li ◽

Xueli Zhao ◽

Xiaole Qi ◽

Shanshan Zhao

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Cutting Force ◽

Finite Element Simulation ◽

Orthogonal Experiment ◽

Element Model ◽

3D Finite Element ◽

Element Simulation ◽

Metal Machining ◽

Single Factor Experiment

Background: Finite element simulation has become an important method for the mechanism research of metal machining in recent years. Objective: To study the cutting mechanism of hardened 45 steel (45HRC), and improve the processing efficiency and quality. Methods: A 3D oblique finite element model of traditional turning of hardened 45 steel based on ABAQUS was established in this paper. The feasibility of the finite element model was verified by experiment, and the influence of cutting parameters on cutting force was predicted by single factor experiment and orthogonal experiment based on simulation. Finally, the empirical formula of cutting force was fitted by MATLAB. Besides, a lot of patents on 3D finite element simulation for metal machining were studied. Results: The results show that the 3D oblique finite element model can predict three direction cutting force, the 3D chip shape, and other variables of metal machining and the prediction errors of three direction cutting force are 5%, 9.02%, and 8.56%. The results of single factor experiment and orthogonal experiment are in good agreement with similar research, which shows that the model can meet the needs for engineering application. Besides, the empirical formula and the prediction results of cutting force are helpful for the parameters optimization and tool design. Conclusion: A 3D oblique finite element model of traditional turning of hardened 45 steel is established, based on ABAQUS, and the validation is carried out by comparing with experiment.

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Serrated Chips Formation in Micro Orthogonal Cutting of Ti6Al4V Alloys with Equiaxial and Martensitic Microstructures

Micromachines ◽

10.3390/mi10030197 ◽

2019 ◽

Vol 10 (3) ◽

pp. 197 ◽

Cited By ~ 1

Author(s):

ZeJia Zhao ◽

Suet To ◽

ZhuoXuan Zhuang

Keyword(s):

Cutting Force ◽

Unit Length ◽

Orthogonal Cutting ◽

Machining Process ◽

Orthogonal Machining ◽

Large Yield ◽

Power Spectral ◽

Straight Line ◽

Serrated Chips ◽

Electropulsing Treatment

The formation of serrated chips is an important feature during machining of difficult-to-cut materials, such as titanium alloy, nickel based alloy, and some steels. In this study, Ti6Al4V alloys with equiaxial and acicular martensitic microstructures were adopted to analyze the effects of material structures on the formation of serrated chips in straight line micro orthogonal machining. The martensitic alloy was obtained using highly efficient electropulsing treatment (EPT) followed by water quenching. The results showed that serrated chips could be formed on both Ti6Al4V alloys, however the chip features varied with material microstructures. The number of chip segments per unit length of the alloy with martensite was more than that of the equiaxial alloy due to poor ductility. Besides, the average cutting and thrust forces were about 8.41 and 4.53 N, respectively, for the equiaxed Ti6Al4V alloys, which were consistently lower than those with a martensitic structure. The high cutting force of martensitic alloy is because of the large yield stress required to overcome plastic deformation, and this force is also significantly affected by the orientations of the martensite. Power spectral density (PSD) analyses indicated that the characteristic frequency of cutting force variation of the equiaxed alloy ranged from 100 to 200 Hz, while it ranged from 200 to 400 Hz for workpieces with martensites, which was supposedly due to the formation of serrated chips during the machining process.

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