• Title, Summary, Keyword: 스피닝

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Experimental Study on the Conventional Spinning of Cylindrical Steel Cups (원통형 컵에 대한 강판의 Conventional 스피닝의 실험 연구)

  • 이항수
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.274-277
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    • 2003
  • The purpose of this study is preparing the database for conventional spinning of the steel sheets which are applied into the mechanical parts such as wheel disc and driving clutch drums. The experimental work for the conventional spinning of cylindrical typed shell has been carried out and the database for limiting spinning ratios, suing-back and thickness distributions has been obtained. The working conditions are categorized for the feeding velocity and dimension of rotating mandrel and forming roller. The results are useful to the product design of conical parts. And the present study can contribute to the improvement of industrial technology.

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Shear Spinning of Ti-6Al-4V Alloy at Hot Working Temperature (Ti-6Al-4V 합금의 열간 전단 스피닝)

  • Lee, H.S.;Song, Y.B.;Hong, S.S.
    • Transactions of Materials Processing
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    • v.20 no.6
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    • pp.432-438
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    • 2011
  • A method for estimating the shear spinnability is suggested, and it was applied to sheets of Ti-6Al-4V alloy for estimation of shear spinnability at hot working temperature. The effective working temperature was $850^{\circ}C$ or above. The hot spinning operation was carried out in two steps of shear spinning. The reduction of thickness at the first step was 50% and 45% at the second, and the overall reduction of thickness was 72.4%. The cone spinning process could produce a uniform wall thickness with only a few percent tolerance, proving itself appropriate for making cones of Ti-6Al-4V alloy with uniform wall thickness.

A study on the process of tube end spinning by the upper bound method and the finite element method (상계해법과 유한요소법을 이용한 스피닝공정 해석에 관한 연구)

  • 김전형;홍성인;이정환;이영선
    • Transactions of Materials Processing
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    • v.6 no.6
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    • pp.517-526
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    • 1997
  • The purpose of this study is to investigate changes in the wall thickness of tube sinking and working forces by the upper bound method and ABAQUS code. The independent variables are ; workpiece material, original wall thickness of tube, die angle, friction, and reduction of diameter. The results indicate that these five variables are factors of the increase in wall-thickness and working forces. Three variables, a inner tube wall angle and two angles of the velocity discontinuous surfaces, are optimized in this proposed velocity field by the upper bound method. In this method, we can estimate the working forces and final tube thicknesses similar to actual forming process. Optimum process variables which are obtained by upper bound method are used in ABAQUS pre-model.

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Experimental Study on the Conventional Spinnability of Steel Sheets (강판재의 보통 스피닝에 대한 성형성 연구)

  • Lee H. S.
    • Transactions of Materials Processing
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    • v.14 no.9
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    • pp.764-771
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    • 2005
  • This study is related with the development of CNC spinning machine and the axisymmetric conventional spinning such as drum type and conical type steel shells. The CNC spinning machine is constructed with heavy duty frame and the hydraulic servo system is applied in order to give the exactness of motion control. The experiment has been carried out considering feeding velocity, mandrel shape, and the corner radius of mandrel and forming rollers. As a result of experiment, the limiting spinning ratio and thickness strain distribution are obtained and it can be seen that the spinnability is dominant to the feeding velocity and corner radius of forming roller. This research can contribute to the development of axisymmetric mechanical part which is applicable to automotive and aerospace industry.

New Deformation Mechanism in the Forming of Cones by Shear Spinning (전단 스피닝에 의한 원추형상의 성형에 관한 변형 메커니즘)

  • Kim J. H.;Kim Chul
    • Transactions of Materials Processing
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    • v.14 no.4
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    • pp.375-383
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    • 2005
  • The shear spinning process, where the plastic deformation zone is localized in a very small portion of the workpiece, shows a promise for increasingly broader application to the production of axially symmetric parts. In this paper, the three components of the working force are calculated by a newly proposed deformation model in which the spinning process is understood as shearing deformation after uniaxial yielding by bending, and shear stress, $\tau_{rz}$, becomes k, yield limit in pure shear, in the deformation zone. The tangential force are first calculated and the feed force and the normal force are obtained by the assumption of uniform distribution of roller pressure on the contact surface. The optimum contact area is obtained by minimizing the bending energy required to get the assumed deformation of the blank. The calculated forces are compared with experimental results. A comparison shows that theoretical prediction is reasonably in good agreement with experimental results

One Case of Rhabdomyolysis After Spinning Exercise (스피닝 운동 후 발생한 횡문근융해증 치험 1례)

  • Jeong, Ho-young;Nam, Seung-kyu;Cho, Chung-sik
    • The Journal of Internal Korean Medicine
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    • v.37 no.5
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    • pp.711-716
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    • 2016
  • Objective: To report a case of rhabdomyolysis that occurred after spinning exercise. Methods: A patient diagnosed with rhabdomyolysis received Korean medical treatment and Western medical treatment for 6 days. We observed the patient for 13 days. Clinical symptoms were evaluated with a Numerical Rating Scale (NRS) and laboratory tests, which included Liver Functional Test (LFT), Renal Functional Test (RFT), creatinine phosphokinase (CPK), myoglobin, and urine tests. Results: After treatment, the clinical symptoms were improved. In this case, acute renal failure did not occur. Laboratory results, including AST, ALT, CPK, and LDH, were also improved. Conclusions: Rhabdomyolysis can be treated cooperatively with Korean and western medical cooperative treatment.

A Study on the Rotating Ring Using Air Bearing in Yarn Manufacturing Process (방적공정에 있어서 공기 베어링을 이용한 회전링에 관한 연구)

  • Jang, Seung-Ho
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.19 no.5
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    • pp.622-630
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    • 2010
  • The increase of the spindle speed to enhance the productivity in ring spinning processes has been limited by yarn tension and heat generation of the traveller/ring. The main causes of yarn tension are 1) the force added directly to the yarn by the rotation of the spindle and 2) the centrifugal force exerted by the yarn balloon generated by traveller rotation. The dominant causes of heat generation are 1) the friction between the ring and traveller and 2) the friction between the traveller and yarn. These factors cause yarn end-breaks and heat damage. In the case of the staple yarn manufacturing process for PET (polyester) and nylon (a heat plasticity material), the rotational speed of the ring spinning system has deteriorated to 10,000rpm. The objective of this study was to develop a rotating ring which has dynamic stability, high productivity and a simple structure to overcome the limitations of the conventional fixed ring/traveller system. The results of this study revealed that the spinning tension could be reduced by 67.8% using the newly developed rotating ring.

Influence of Working Conditions on the Spinnability of Cylindrical Cups of Aluminum Sheet Metal (알루미늄 원통컵의 스피닝 성형성에 영향미치는 작업조건 연구)

  • 김종호;박규호;나경환;김승수
    • Transactions of Materials Processing
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    • v.8 no.5
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    • pp.465-470
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    • 1999
  • Many researchers have, nowadays, studied on spinning which can produce highly qualified products by CNC spinning machine equipped with hydraulic devices. The products have continuous metal flow which improves fatigue life, yield point, tensile strength and hardness. This study is to investigate the influence of various working conditions on the spinnability of cylindrical cups such as feed rate(ν), feed pitch(p), angle of roller holder(α), and the inclination angle of first roller path. Through experiments the feed rate of (0.4∼0.7) mm/rev was shown to give the drawing ratio of 2.5 when the angle of roller holder was 5°, However, by increasing the angle of roller holder from 5°to 20°, the range of feed rate which can produce deeper cups became wider and the spinnability was also improved. The optimum working conditions, for the maximum formability of aluminum sheet metal as well as dimensional accuracy of spun cups, are presented and discussed.

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Study on the Spinning Processes Combined with Shear and Shrinking Deformation (전단 및 교축변형이 조합된 복합스피닝 공정에 관한 연구)

  • 이항수;강정식
    • Transactions of Materials Processing
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    • v.8 no.5
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    • pp.507-519
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    • 1999
  • An approach using the energy method has veen proposed for the analysis of cone spinning having the complicated deformation modes mixed by shear and normal deformation. In the proposed method, the corresponding solution is found through optimization of the total energy dissipation with respect to the parameters assumed by the velocity field defined as the variation of the length in longitudinal direction. The sheet blank is divided into three layers to consider the bending effect and the energy dissipated by shear deformation is superposed to the energy consumption due to normal deformation related with the shrinking deformation is superposed to the energy consumption due to normal deformation related with the shrinking deformation of axi-symmetric sheet element for the evaluation of total deformation energy. In order to check the validity of the proposed method, the complex spinning for making the conical cup is analyzed and the computed results are compared with the experimental results. In comparison of the computed results with existing experimental results,, the good agreement is obtained for the variation of outer radius and the distribution of thickness, and it has thus been shown that the present approach is applicable to the analysis of complex spinning.

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Comparison on the Forming Force of Flow Forming with Various Roller Profiles (다양한 롤러 단면형상을 적용한 유동성형의 성형력 비교)

  • Nam, Kyoung-O;Kim, Bum-Nyun;Won, Jong-Ho
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.4
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    • pp.113-118
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    • 2007
  • The flow forming has been used to produce long thin walled tube parts, with the reduced fanning force and the enhanced mechanical and surface quality for a good finished part, compared with the fanned parts using other method. Therefore, flow fanning technique is used widely in industrial production. Spinning and flow fanning techniques are used frequently in automotive, aerial and defense industries. The main factors for the flow fanning machine design are motor power, bed rigidity, mandrel stiffness, spindle power, roller profile, etc. Especially, mandrel, spindle power and roller are important factors for flow fanning machine capacity. In this paper, three dimensional finite element method for analysis of one-roller backward flow fanning of a workpiece has been carried out to study effects of roller profile on fanning force. Applied roller profile have roller lead geometries of angle $20^{\circ},\;30^{\circ},\;40^{\circ}$, concave and convex. Axial and radial fanning forces on various roller profiles are obtained and compared with each analysis cases.