• 제목/요약/키워드: Die Angle

검색결과 287건 처리시간 0.031초

자동차 휠 너트용 냉간단조 금형에서 인서트링과 보강링의 최적 설계에 관한 연구 (Study on the Optimum Design of the Insert Ring and Shrunk Ring of the Cold Forging Die for an Automotive Wheel Nut)

  • 이권수;김기엽;안용식
    • 소성∙가공
    • /
    • 제27권3호
    • /
    • pp.165-170
    • /
    • 2018
  • In order to increase the lifetimes of cold forging dies, insert rings are generally used. In this study, an insert ring and shrunk ring of the flange upsetting die were designed for the cold forging of an automotive wheel nut. The Stress distribution occurring in the die during forging was simulated using a commercial finite element analyzing program. The effects of the fitting interference and inclined angle of the insert ring on the compressive stress of the die inside were also investigated. The simulated data were compared with the real lifetimes of the forging dies. The maximum compressive stress acting on the edge of a forging die should have the most influence on die lifetime, an idea which could help develop the die design with the longest lifetime. The design of the most optimal forging die with the longest lifetime is made possible by analyzing the maximum inner pressure and principal stress between the shrunk ring and insert ring.

CAD/CAE를 이용한 냉간 비조질강용 회전전조 금형설계 (Design of Cross Wedge Rolling Die for a Non-heat-treated Cold Steel using CAD and CAE)

  • 이형욱;윤덕재;이근안;최석우
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2004년도 춘계학술대회 논문집
    • /
    • pp.400-403
    • /
    • 2004
  • A non-heat기leafed steel does not need quenching and tempering processes that are called a heat treatment differently from conventional steel. Since the tensile strength of this steel is higher than 900MPa, a conventional forming process should be changed to incremental forming process such as a cross wedge rolling that requires lower load capacity than conventional ones. In this paper, the cold cross wedge rolling (CWR) die has been designed using CAD/CAE In order to produce near-net-shaped component of ball stud of non-heat-treated cold steel. Finite element analyses were applied in order to investigate process parameters of CWR. Results provide that the stretching angle and the forming angie at knifing zone in CWR process is important parameter to be the stable process under the low friction coefficient condition.

  • PDF

자동차 토크앵글센서(TAS)의 평면 정밀도에 관한 연구 (A study on the flatness of automotive torque-angle sensors)

  • 윤선진;조용무
    • Design & Manufacturing
    • /
    • 제12권2호
    • /
    • pp.11-15
    • /
    • 2018
  • In this study, we proposed three analysis methods to calculate the flatness of torque-angle sensors (TAS). We introduced two statistical and one geometrical methods in evaluating the precision of the flat plane in the axis direction for TAS. To verified the results, we fabricated TAS and a reference sample using a injection molding machine, mold, polyester as a raw material. We measured ($x_i$, $y_i$) position using 3D contact automated system and applied three analysis methods developed for TAS and a reference sample to see the feasibility. While each analysis method has its own pros and cons, the analysis using the shortest optimal distance was the most precise technique for the flatness evaluation of TAS components.

Stripe 코팅용 슬롯 다이 헤드 모세관 유동 전산모사 (Simulation of Capillary Flow Along a Slot-die Head for Stripe Coatings)

  • 유수호;이진영;박종운
    • 반도체디스플레이기술학회지
    • /
    • 제18권1호
    • /
    • pp.92-96
    • /
    • 2019
  • In the presence of ${\mu}-tip$ embedded in a slot-die head for stripe coatings, there arises the capillary flow that limits an increase of the stripe density, which is required for the potential applications in organic light-emitting diode displays. With an attempt to suppress it, we have employed a computational fluid dynamics software and performed simulations by varying the ${\mu}-tip$ length and the contact angles of the head lip and ${\mu}-tip$. We have first demonstrated that such a capillary flow phenomenon (a spread of solution along the head lip) observed experimentally can be reproduced by the computational fluid dynamics software. Through simulations, we have found that stronger capillary flow is observed in the hydrophilic head lip with a smaller contact angle and it is suppressed effectively as the contact angle increases. When the contact angle of the head lip increases from $16^{\circ}$ to $130^{\circ}$, the distance a solution can reach decreases sharply from $256{\mu}m$ to $44{\mu}m$. With increasing contact angle of the ${\mu}-tip$, however, the solution flow along the ${\mu}-tip$ is disturbed and thus the capillary flow phenomenon becomes more severe. If the ${\mu}-tip$ is long, the capillary flow also appears strong due to an increase of flow resistance (electronic-hydraulic analogy). It can be suppressed by reducing the ${\mu}-tip$ length, but not as effectively as reducing the contact angle of the head lip.

광섬유 2차 코팅다이 형상 변화에 따른 유리섬유 고속 코팅공정 영향성 해석연구 (Numerical Study of Secondary Coating Die Geometry Effects on High Speed Optical Glass Fiber Coating Process)

  • 김경진;박중윤
    • 반도체디스플레이기술학회지
    • /
    • 제18권3호
    • /
    • pp.12-18
    • /
    • 2019
  • The protective double layer polymer coatings on silica optical fibers are realized by wet-on-wet liquid coating process and they play an important role in final quality of mass produced optical fibers. This numerical study aims to analyze the effects of secondary coating die design parameters by employing two dimensional axisymmetric model of coating cup and coating die geometry and computational fluid dynamics simulations which include temperature dependent viscosity of polymer coating liquids and viscous dissipation heating. Under high speed fiber drawing conditions and pressurized coating liquid supply, the effects of converging die angle are investigated in order to appreciate the change of coating liquid flow patterns such as flow recirculation zone near coating die as well as primary and secondary coating layer thicknesses. The auxiliary coating die to converging coating die is also tested and the results find that this concept is advantageous in achieving stable double layer coatings on silica glass fiber.

후크 벤딩 금형 설계의 전산화에 관한 연구 (Study on the Computerization of Die Design for Bending Hook)

  • 조은정;정호승;정철우;조종래;최일동
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제26권4호
    • /
    • pp.450-456
    • /
    • 2002
  • Die desig for manufacturing hooks from steel wires has been depended on empirical procedures based on trial and error method. To design die, at first the curvature and bending angle of hook are computed by using AutoCAD and developed program which is composed of Visual Basic. Then spring back should be considered because the elastic recovery of material is very important in bending process. In this study, bending analysis of elastic-plastic materials is applied to predict curvature of hook and spring back. Therefore, systematic procedure of die design for bending hook is achieved to consider elastic recovery in terms of hook shapes. Experimental results are good agreement with calculated results.

다구치 방법을 이용한 튜브 냉간 압출 금형의 최적화 (Optimization of Die Design for Tube Cold Extrusion using Taguchi Method)

  • 임성식;임성주;최호준;조종두
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2006년도 춘계학술대회 논문집
    • /
    • pp.153-158
    • /
    • 2006
  • Nowadays, hollow upper-shaft of monobloc type has been considered for weight reduction and high quality in the automobile industry. To form the upper-shaft under tube cold extrusion, Taguchi method is applied to optimize the die design in this study. Taguchi method for optimum die design is to establish the optimal combination of design parameters and to reduce a number of experiments. Effect of parameters including the die relief, mandrel, die half angle is investigated and analyzed based on FEA analysis using a FEM commercial software MSC_Marc. Furthermore extrusion experiments have been performed to verify the results investigated in the FEM simulations.

  • PDF

상계해법에 의한 원형빌렛으로부터 타원 단면을 가진제품의 압출가공의 비틀림 해석 (An Upper Bound Analysis for the Twisting Phenomenon of Extrusion of Elliptical Shapes from Round Billet)

  • 김한봉;진인태
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 1998년도 춘계학술대회논문집
    • /
    • pp.210-213
    • /
    • 1998
  • A kinematically admissible velocity field is developed for the analysis of twisting of extruded products. The twisting of extruded product is caused by the linearly increased rotational velocity from the center on the cross-section of the workpiece at the die exit. In the analysis, the rotational velocity in angular direction is assumed by the multiplication of radial distance and angular velocity. The angular velocity is zero at the die entrance and is increased linearly by axial distance from die entrance. The increase rate of angular velocity is determined by the minimization of plastic work. The results of the analysis show that the angular velocity of the extruded product increase with the die twisting angle and the aspect ratio of product and friction condition and reduction area and show that angular velocity increases with the decreases in die length.

  • PDF

박판을 이용한 Z-굽힘 가공의 전개 길이에 관한 연구 (A study on the unfolding length of Z-bending machining using thin plate)

  • 박용순;최계광
    • Design & Manufacturing
    • /
    • 제15권3호
    • /
    • pp.19-25
    • /
    • 2021
  • The bending process of a press die is to bend a flat blank to the required angle. There are V-bending, U-bending, Z-bending, O-bending etc. for bending processing, and the basic principle of calculating the unfolding length of die processing is used as the neutral plane length. Since the constant of the length value of the neutral surface is different depending on the type of bending, it is impossible to accurately calculate it. In particular, Z-bending processing is performed twice, and it is set on the upper and lower surfaces of the blank, and bending processing occurs at the same time as the upward and downward bending, and the elongation of the material occurs and the material increases. It is not possible to check with the calculated value, and it occurs in many cases where the mold is modified after start-up. This study aims to minimize die modification by developing a formula to calculate the development length of Z-bend.

파인 블랭킹 금형의 V-링 위치 및 다이 챔퍼 형상이 다이 롤 높이에 미치는 영향에 관한 실험 연구 (An experimental study on the effect of V-ring position and die chamfer shape on the die roll height in fine blanking tool)

  • 김종덕
    • 한국산학기술학회논문지
    • /
    • 제13권5호
    • /
    • pp.2009-2014
    • /
    • 2012
  • 기어의 파인 블랭킹에서 기능면으로 사용되는 전단면(잇 면)을 최대한 확보하기 위하여 다이 롤 높이(die roll height)의 최소화는 매우 중요하다. 본 논문에서는 파인 블랭킹 금형의 핵심 설계 요소인 V-링 위치와 다이 챔퍼(die chamfer) 형상에 따라 기어의 다이 롤 높이 변화를 고찰하기 위하여 V-링 거리와 다이 챔퍼 형상이 다른 여러가지 다이 편 및 가이드 플레이트 편으로 구성된 파인 블랭킹 금형 세트를 제작하여 실험하였다. 각 실험으로부터 시편을 채취하여 다이 롤 높이를 측정 분석한 결과 파인 블랭킹 기어의 다이 롤 높이는 각 모듈에서 다이 챔퍼 각도가 증가함에 따라 증가하고 V-링 거리가 증가함에 따라 증가됨을 알 수 있었다.