Thermal field distribution in fly-cutting of KDP crystal and its influence on chip morphology

As an important nonlinear optical material, potassium dihydrogen phosphate (KDP) crystal is used in high-power laser beams as the core element of inertial confinement fusion. It is the most general method of single point diamond fly-cutting (SPDF) to produce high precision and crack-free KDP surfaces. Nevertheless, the cutting mechanism of such material remains unclear, and therefore needs further analysis. Firstly, the stress field, cutting force and cutting temperature under different working conditions are calculated by a KDP crystal cutting simulation model. Then, the rules and the cause of change and interaction mechanisms of force and temperature are analyzed by comparing the measurement experiments with simulations. Furthermore, the causes of chip formation and micro-cracks on the machined surface are analyzed based on thermo-mechanical coupling and chip morphology. The conclusion can be deduced: Although the temperature has not reached the phase transition temperature during the finishing process, under high cutting speeds and large unformed chip thickness, such as semi-finishing and roughing, the temperature can reach up to 180 °C or higher, and KDP crystals are very likely to phase transition—chip morphology also verifies this phenomenon.

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Thermal-Mechanical Effect on Temperature/Stress Distribution when Orthogonal Cutting Bearing Steel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.407-408.420 ◽

2009 ◽

Vol 407-408 ◽

pp. 420-423

Author(s):

He Ping Wang ◽

Xue Ping Zhang

Keyword(s):

Stress Distribution ◽

Orthogonal Cutting ◽

Cutting Speed ◽

Chip Morphology ◽

Bearing Steel ◽

Mechanical Effect ◽

Arbitrary Lagrangian Eulerian ◽

Calculation Results ◽

On Chip ◽

Explicit Dynamic

An explicit dynamic coupled thermal-mechanical Arbitrary Lagrangian Eulerian (ALE) model was established to simulate orthogonal cutting AISI 52100 bearing steel, and its temperature and stress distribution. Based on ABAQUS, The ALE approach effectively simulates plastic flow around round edge of the cutting tool without employing chip separation criteria. The calculation results reveal that cutting speed and cutting depth have great impact on chip morphology, stress and temperature distribution in the finished surface and subsurface, the predicted temperature agrees well with experiment data obtained under the similar cutting conditions as well as the change in chip morphology from continuous to sawtooth as the cutting speed increases.

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Study of the Effect of Tool Wear on Cutting Ti6Al4V Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.2030 ◽

2013 ◽

Vol 690-693 ◽

pp. 2030-2035

Author(s):

Shu Bao Yang ◽

Hong Chao Ni ◽

Guo Hui Zhu

Keyword(s):

Tool Wear ◽

Cutting Force ◽

Cutting Temperature ◽

Chip Morphology ◽

Key Factors ◽

Serrated Chip ◽

Comprehensive Properties ◽

Commercial Applications ◽

On Chip ◽

Rapid Tool

Ti6Al4V alloy is widely used in the aircraft industry, marine and the commercial applications due to its excellent comprehensive properties. However, its poor machinability prevents it from application widely, and the rapid tool wear is one of the key factors. The FEM models of cutting titanium alloy are established. The effect of tool wear on chip morphology, cutting temperature and cutting force are studied. The simulation results show that: the cutting force and cutting temperature will rise with the increase of tool wear. Furthermore, the degree of chip deformation will improve, but the frequency of serrated chip tooth occurred will decrease.

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Thermodynamics Model and Experimental Validating on Thermal Field Distribution of Traditional Moxibustion

2005 IEEE Engineering in Medicine and Biology 27th Annual Conference ◽

10.1109/iembs.2005.1615585 ◽

2005 ◽

Cited By ~ 1

Author(s):

Liu Zhipeng ◽

Yin Tao ◽

Li Xin ◽

Li Ying

Keyword(s):

Field Distribution ◽

Thermal Field

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Experimental study on chip shape in ultrasonic vibration–assisted turning of 304 austenitic stainless steel

Advances in Mechanical Engineering ◽

10.1177/1687814019870896 ◽

2019 ◽

Vol 11 (8) ◽

pp. 168781401987089 ◽

Cited By ~ 2

Author(s):

Yingshuai Xu ◽

Zhihui Wan ◽

Ping Zou ◽

Qinjian Zhang

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Ultrasonic Vibration ◽

Process Parameters ◽

Chip Morphology ◽

Cutting Parameters ◽

Chip Shape ◽

304 Austenitic Stainless Steel ◽

On Chip ◽

The Impact

There are many problems and physical phenomena in turning process, like machined surface quality, cutting force, tool wear, and so on. These factors and the chip shape of workpiece materials, which is an important aspect to study the mechanism of ultrasonic vibration–assisted turning, go hand in hand. This article first introduces the types and changes of chip, meanwhile the chip formation mechanism of ultrasonic vibration–assisted turning is studied and analyzed, and the turning experiments of 304 austenitic stainless steel with and without ultrasonic vibration are carried out. The difference of chip morphology between ultrasonic vibration–assisted turning and conventional turning is contrasted and analyzed from the macroscopic and microscopic point of view. The influence of process parameters on chip shape and the impact of chip shape on machining effect are also analyzed. Results indicate that when process parameters (vibration frequency, ultrasonic amplitude, and cutting parameters) are suitably selected, ultrasonic vibration–assisted turning can gain access to better chip shape and chip breaking effect than conventional turning. By contrast with conventional turning, phenomenon of serrated burr on the chip edge and the surface defects of chip in ultrasonic vibration–assisted turning have improved significantly. Moreover, it is found that superior chip morphology in ultrasonic vibration–assisted turning can be acquired under the circumstance of comparatively small cutting parameters (cutting speed, depth of cut, and feed rate); at the same time, preferable chips can also obtain ranking machining effect.

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3D thermal field modelling in electromagnetic gripping system

ITM Web of Conferences ◽

10.1051/itmconf/20192801012 ◽

2019 ◽

Vol 28 ◽

pp. 01012

Author(s):

Mariusz Barański ◽

Krystian Glapa

Keyword(s):

Steady State ◽

Field Distribution ◽

Thermal Field ◽

Walking Robot ◽

Field Modelling ◽

Field Modeling

In this paper, 3D steady-state thermal field modeling in electromagnetic gripping system using Comsol Multiphisics was presented. The electromagnetic gripping system, which is a component of the mechanical leg of a walking robot was designed by the authors. An algorithm to design of the electromagnetic gripping was developed. During calculations, the influence of the value of the current on the thermal field distribution in steady-state was carried out. Selected results of simulations as well as the analysis of these results were presented.

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Study on the Thermal Field Distribution of Steel Claws for Anode in Aluminium Electrolysis Cell

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1120-1121.1089 ◽

2015 ◽

Vol 1120-1121 ◽

pp. 1089-1092

Author(s):

Qing Dong Qin

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Field Distribution ◽

Thermal Field ◽

Voltage Drop ◽

The Other ◽

Electrolysis Cell ◽

Aluminium Electrolysis ◽

Element Analysis ◽

Anode Carbon

The electricity consuming of aluminium electrolysis cell is affected by the voltage drop of anode steel claws during the aluminium electrolysis course. The resistivity of anode steel claws is affected by the temperature. In the present study, the thermal field distribution of anode steel claws was studied by finite element analysis. The results show that the thermal energy of anode steel claws come from anode carbon blocks and environment. The temperature of steel claws less than 1/3 height is affected by anode carbon blocks, and the other part is affected by surrounding temperature. According the results, the principle of the new anode steel claw design is proposed.

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