• Title/Summary/Keyword: Metal Cutting Process

Search Result 230, Processing Time 0.03 seconds

A Study on Contact Arc Metal Cutting for Dismantling of Reactor Pressure Vessel (원자로 해체를 위한 수중 아크 금속 절단기술에 대한 연구)

  • Kim, Chan Kyu;Moon, Do Yeong;Moon, Il Woo;Cho, Young Tae
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.21 no.1
    • /
    • pp.22-27
    • /
    • 2022
  • In accordance with the growing trend of decommissioning nuclear facilities, research on the cutting process is actively proceeding worldwide. In general, a thermal cutting process, such as plasma cutting is applied to decommissioning a nuclear reactor pressure vessel (RPV). Plasma cutting has the advantage of removing the radioactive materials and being able to cut thick materials. However, when operating under water, the molten metal remains in the cut plane and re-solidifies. Hence, cutting is not entirely accomplished. For these environmental reasons, it is difficult to cut thick metal. The contact arc metal cutting (CAMC) process can be used to cut thick metal under water. CAMC is a process that cuts metal using a plate-shaped electrode based on a high-current arc plasma heat source. During the cutting process, high-pressure water is sprayed from the electrode to remove the molten metal, known as rinsing. As the CAMC is conducted without using a shielding gas, such as Argon, the electrode is consumed during the process. In this study, CAMC is introduced as a method for dismantling nuclear vessels and the relationship between the metal removal and electrode consumption is investigated according to the cutting conditions.

A study on the effect of cutting parameters of micro metal cutting mechanism using finite element method (유한유쇼법을 이용한 미소절삭기구의 절삭인자 규명에 관한 연구)

  • Hwang, Joon;Namgung, Suk
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.10 no.4
    • /
    • pp.206-215
    • /
    • 1993
  • The finite element method is applied to analyze the mechanism of metal cutting, especially micro metal cutting. This paper introduces some effects, such as constitutive deformation laws of workpiece material, friction of tool-chip contact interfaces, tool rake angle and also simulate the cutting process, chip formation and geometry, tool-chip contact, reaction force of tool. Under the usual plane strain assumption, quasi-static analysis were performed with variation of tool-chip interface friction coefficients and tool rake angles. In this analysis, cutting speed, cutting depth set to 8m/sec, 0.02mm, respectively. Some cutting parameters are affected to cutting force, plastic deformation of chip, shear plane angle, chip thickness and tool-chip contact length and reaction forces on tool. Several aspects of the metal cutting process predicted by the finite element analysis provide information about tool shape design and optimal cutting conditions.

  • PDF

A Study on Development of Forming Roller for Metal Ball Manufacturing Process for Machine Parts (기계부품용 금속구 제조공정의 성형롤러 개발에 관한 연구)

  • Joe H.S.;Park C.K.;Kim Y.H.;Kim Y.H.;Park C.W.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2005.06a
    • /
    • pp.1686-1690
    • /
    • 2005
  • Although metal ball can be used as parts of bearing or metal filter, that is used by single product with solder ball or shot ball. Also, according as demand of metal ball of various diameter increase, processing property 솜 extension of coverage are important. Especially an optimal design of cutting roller was investigated for determining appropriate dimensions of components of manufacturing system. In this study, the effects of the diameter and the round radius of cutting roller were calculated and analyzed. We applied data of rigid-plastic FEM Simulation in basis design of equipment to solve these issues, and confirmed processing factor about metal ball manufacturing process that use cutting process of metal wire in this research

  • PDF

A Study on the Applications of Finite Element Techniques to Chip Formation and Cutting Heat Generation Mechanism of Cutting Process (CHIP생성 및 절삭열 발생기구 해석을 위한 유한요소법 적용에 관한 연구)

  • Hwang, Joon;Namgung, Suk
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.12 no.9
    • /
    • pp.148-155
    • /
    • 1995
  • The object of this study is to achieve a gteater understanding of meterial removal process and its mechanism. In this study, some applications of finite element techniques are applied to analyze the chip formation and cutting heat generation mechanism of metal cutting. To know the effect of cutting parameters, simulations employed some independent cutting variables change, such as constitutive deformation laws of workpiece and tool material, frictional coefficients and tool-chip contact interfaces, cutting speed, tool rake angles, depth of cut and this simulations also include large elastic-plastic defor- mation, adiabetic thermal analysis. Under a usual plane strain assumption, quasi-static, thermal-mechanical coupling analysis generate detailed informations about chip formation process and cutting heat generation mechanism Some cutting parameters are affected to cutting force, plastic deformation of chip, shear plane angle, chip thickness and tool-chip contact length and reaction force on tool, cutting temperature and thermal behavior. Several aspects of the metal cutting process predicted by the finite element analysis provide information about tool shape design and optimal cutting conditions.

  • PDF

Burr Prediction via Finite Element Method and Burr Formation Characteristics in Metal Cutting Process (유한요소법을 이용한 절삭가공 Burr 예측과 생성특성 연구)

  • Hwang, Joon;Hwang, Duk-Chul;Woo, Chang-Gi;Yang, Kea-joon
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2001.04a
    • /
    • pp.1000-1003
    • /
    • 2001
  • This paper presents the numerical analysis and experimental verification to know the metal cutting burr formation mechanism in face milling operation. Finite element method are applied to predict the 2-D burr formation process prediction. Face milling process are adjusted to analyze the characteristics of burr shapes according to various cutting conditions. The cutting parameters were investigated with cutting speed, feed rate, depth of cut. Through the experiments various burr types are classified according to its shape and properties.

  • PDF

Application of A* Algorithm to solve a Cutting Problem in Metal Manufacturing Process (A* 알고리즘을 적용한 금속 그레이팅 생산 공정에서의 절단문제 해결)

  • Kim, Jin-Myoung;Cho, Tae-Ho
    • Journal of the Korea Society for Simulation
    • /
    • v.14 no.4
    • /
    • pp.1-8
    • /
    • 2005
  • In a metal grating manufacturing process, the cutting operation allocates the gratings and cut them out from given panels or a plate sheets. Before the cutting operation an operator generates a cutting plan. The cutting plan should decide how pieces of metal rectangles i.e., gratings, are allocated and cut from the panel. This plan generation is a deal of weight on the production cost. the generation of cutting plan is similar to the general two-dimensional cutting problem. In this paper, we first define cutting problem and Af algorithm of Artificial Intelligence to solve the problem. Also, through a simulation, we compare the proposed cutting algorithm to an existing method in terms of material loss

  • PDF

A Study on Machining Characteristics of Single-insert and Multi-insert Face Milling (단인과 다인 정면밀리의 가공특성에 관한 연구)

  • Kim, S.I.;Lee, W.R.;Kim, T.Y.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.12 no.4
    • /
    • pp.19-27
    • /
    • 1995
  • Face milling is required to study cutting process with a view of multipoint cutter. This experimental study mainly deals with the single and multi-insert cutting characteristics using coated tool. Because metal cutting of the single and multi-insert has a large relation to the improvement of productivity, the economic cutting process can be achieved by the analysis of proper metal cutting mechanism. Therefore, machining characteristics of face molling in this paper has been studied by investigating the role of different insert number which is concerned with mean cutting force, the RMS values of AE(acoustic emission) signal, tool life and surface roughness in milling SS 41 and SUS 304. The cutting force and AE signal are monitored to make an analysis of cutting process. The surface roughness of the specimens machined by inserts of different numbers is measured at different speeds, feeds and depth of cut. The width of flank wear is also observed.

  • PDF

A Basic Study on Burr Formation of Micro Cutting Process with the Ferrous Metal at tow Temperature (철계 금속 마이크로 절삭 가공시 저온 환경에서의 버 발생에 관한 기초연구)

  • Kim, G.H.;Kim, D.J.;Sohn, J.I.;Yoon, G.S.;Heo, Y.M.;Cho, M.W.
    • Transactions of Materials Processing
    • /
    • v.18 no.2
    • /
    • pp.166-171
    • /
    • 2009
  • In this paper, a basic study on micro cutting process with SM20C at low temperature environment was performed. In macro cutting fields, the cryogenic cutting process has been applied to cut the refractory metal but, the serious problem may be generated in micro cutting fields by the cryogenic environment. However, if the proper low temperature is applied to micro cutting area, the cooling effect of cutting heat is expected. Such effect can make the reduction of tool wear and burr formation. For verifying this possibility, the micro cutting experiment at low temperature was performed and SEM images were analyzed.

A Study on The Surface Roughness by Ploughing Mechanism in Turning Process (선반작업에서 Ploughing Mechanism을 고려한 표면 거칠기에 관한 연구)

  • 홍민성
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1999.10a
    • /
    • pp.251-256
    • /
    • 1999
  • "Ploughing" on the flank face of the tool in the metal cutting process is due to the tool in the metal cutting process is due to the finite edge radius of the tool and due to the development of flank wear. Because of the high stresses near the cutting edge, elastic-plastic deformation would be caused between the tool and the machined surface over a small area of the tool flank. The deformation would affect the roughness of the machined surface. Recently, some attempts have been made to predict the surface roughness, but elastic-plastic effect due to ploughing in the cutting process has not been considered. The research has analyzed mechanism of the ploughing of the cutting process using contact mechanics. Tool and workpiece material properties have been taken into account in the prediction of the surface roughness. The surface roughness has been simulated by the surface-shaping system. The results between experiment and simulation have been compared and analyzed. analyzed.

  • PDF

A Study on the Finite Element Analysis of Chip Formation in Machining (절삭가공시 집형성의 유한요소 해석에 관한 연구)

  • 김남용;박종권;이동주
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1997.10a
    • /
    • pp.973-976
    • /
    • 1997
  • Process behavior in metal cutting results from the chip formation process which is not easily observable and measurable during machining. By means of the finite element method chip formation in orthogonal metal cutting is modeled. The reciprocal interaction between mechanical and thermal loads is taken into consideration by involving the thermo-viscoplastic flow behavior of workpiece material. Local and temporal distributions of stress and temperature in the cutting zone are calculated depending on the cutting parameters. The calculated cutting forces and temperatures are compared with the experimental results obtarned from orthogonal cutting of steel AISl 4140. The model can be applied in process design for selection of appropriate tool-workpiece combination and optimum cutting conditions in term of mechanical and thermal loads.

  • PDF