• 제목/요약/키워드: Forging force

검색결과 53건 처리시간 0.018초

티타늄 합금 플랜지 볼트 성형에서의 단조력 간접 측정을 위한 열간 단조 공정 모니터링에 관한 연구 (A study on a hot forging process monitoring for measurement of indirect forging force in flange bolt forming of titanium alloys)

  • 하석재;최두선;이동원;송기혁
    • Design & Manufacturing
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    • 제15권1호
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    • pp.14-20
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    • 2021
  • The objective of this study is to introduce the new possibility of sensing technology based on inductive displacement sensors to monitor the status of wheel position in the hot forging process. In order to validate effectiveness of proposed sensing technology, the indirect forging force measurement with displacement sensor was applied into a typical closed hot forging die-set used for the manufacturing of flange bolts. The locations to implement the displacement sensor were selected carefully by simulating forming process and static structural. From the measurement results of the forging force change during one hot forging cycle, it was found that the proposed monitoring system can provide useful information to understand the detailed behaviors of die-set in the closed hot forging process.

부유금형을 가진 냉간단조 공정의 유한요소해석 (Finite Element Analysis of a Cold Forging Process Having a Floating Die)

  • 류찬호;전만수
    • 소성∙가공
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    • 제9권2호
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    • pp.159-164
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    • 2000
  • In this paper, a computer simulation technique for the forging process having a floating die is presented. The penalty rigid-plastic finite element method is employed together with an iteratively force-balancing method, in which the convergence is achieved when the floating die part is in force equilibrium within the user-specified tolerance. The force balance is controled by adjusting the velocity of the floating die in an automatic manner. An application example of a three-stage cold forging process is given.

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복동링크유압식 다이세트를 이용한 폐쇄단조의 폐쇄단조조건 (Criterion on Enclosed Die Forging with a Double-Action Link-Type Hydraulic Die Set)

  • 전병윤;박래훈;엄재근;전만수
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2006년도 춘계학술대회 논문집
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    • pp.391-394
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    • 2006
  • In this paper, a criterion on enclosed die forging with a double action link type hydraulic die set is presented. Operational principle of the die set in enclosed die forging is introduced with emphasis on force transfer from the press and the hydraulic system to the material through links, die components and punches. Force transfer mechanism is examined and three different modes are introduced. Requirements on force equilibrium are applied to the three force transfer modes and a criterion on enclosed die forging with a double action link type hydraulic die set is drawn. The criterion is discussed to minimize forming load.

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힘평형법을 이용한 V-형다이 평면변형 자유형 단조공정의 초기변형 해석 (The Incipient Deformation Analysis for Plane Strain Open-Die Forging Processes with V-shaped Dies Using the Force Balance Method)

  • Lee, J.H.;Kim, B.M.
    • 한국정밀공학회지
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    • 제10권4호
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    • pp.109-117
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    • 1993
  • Force balance method is employed to predict forging information such as forging load, tool pressure and normal stress at the surface of tangential velocity discontinuity. The incipient stages of deformation for the plane strain forging of rectangular billets in V-shaped dies of different semi-angles are analysed. To construct an approximate model for the analysis of deformation by the force balance method in the incipient deformation stages, slip-line field is used. When the deformation mode by slip-line method is the same as that by force balance method, the slip-line method and the force balance method give identical solutions. The effects of die angle, coefficient of friction, billet geometries and deforma- tion characteristics are also investigated. In order to verify the validity of force balance analysis, the rigid-plastic finite element simulation for the various forgig parameters are performed and performed and find to be in good agreement.

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터빈 블레이드의 형단조 금형설계 시스템 개발 (Development of Die Design System for Turbine Blade Forging)

  • 조종래
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 춘계학술대회논문집
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    • pp.77-81
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    • 1999
  • The predictions of metal flow forging load optimal die angle and preform size are not so easy in turbine blade forging. First of all the quality of final product is influenced by side force which is one of the significant factors. in this study slab method is applied to determine optimal die angle minimizing side force and the position of preform Finally drawing of die design is obtained in optimal die angle with developing tool that is composed of Visual Basic.

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부유금형을 가진 냉간단조 공정의 유한요소해석 (Finite Element Analysis of a Cold forging Process Having a Floating Die)

  • 전만수
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 춘계학술대회논문집
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    • pp.103-107
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    • 1999
  • In this paper, a computer simulation technique for the forging process having a floating die is presented. The penalty rigid-plastic finite element method is employed together with an iteratively force-balancing method, in which the convergence is achieved when the floating die part is in force equilibrium within the user-specified tolerance. The force balance is controled by adjusting the velocity of the floating die in an automatic manner. An application example of a three-stage cold forging process is given.

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터빈 블레이드의 형단조 금형설계의 자동화에 관한 연구 (Development of Die Design System for Turbine Blade Forging)

  • 최병욱;조종래;왕지석;김동권;김동영
    • 소성∙가공
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    • 제8권6호
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    • pp.569-575
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    • 1999
  • Computer programs have been developed to design the forging dies of turbine and compressor blades. The design of forging dies is based the side force and the filling of die cavity. In this study, slab method has been applied to simulate forging processes numerically. the program composed of Visual Basic also provides the informations of mean stress, total forging load, distribution of temperature, position of neutral line, total volume and volume of flash in the final stage to users. The preform position is predicted by the reverse slab method. The program has been successfully applied to various types of turbine blades.

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열간포머 단조공정중 스프링부착 금형을 가진 피어싱과 트리밍 동시공정의 유한요소해석 (Finite Element Analysis of a Piercing and Trimming Process Having a Spring-Attached Die in Hot Former Forging)

  • 문호근;정재헌;전만수
    • 소성∙가공
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    • 제12권6호
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    • pp.536-541
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    • 2003
  • In this paper, the rigid-viscoplastic finite element method is employed together with an iteratively force-balancing method to analyze a piercing and trimming process with a spring-attached die in hot former forging. An actual piercing and trimming process with a spring-attached die is investigated in detail and a generalized analysis model is proposed. A multi-stage hot former forging process is simulated under various spring constants. The analyzed results are discussed in order to investigate the effects of spring constants on the metal flow lines and the formed shapes. Then an optimal piercing and trimming process in hot former forging is devised.

회전 성형법에 의한 분말단조 제품특성에 관한 연구 (A Study on the Properties of Cold Forging P/M Products by Incremetal Forming Process)

  • 윤덕재;나경환;김영은
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1995년도 춘계학술대회논문집
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    • pp.31-40
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    • 1995
  • Powder metallurgy process has many advantages such as hight efficientyof material, mass productivity and complex shape production with good mechanical properties. Among the powder forming processes, incremental forging allows the consolidation to be achieved with amaller force then those required by conventional forging. In particular the proces known as rotary forging is an unique and prodominant process known as rotary forging is an unique and prodominant process in which the working constraints approximate to those in normal closed die forging. This study is concerned with the powder compaction by rotary forging process. An experimental rotary forging press with 500kN load capacity has been developed, which is equippe dwith the rotational conicla die inclined to the central axis of the press at arbitrary angle. It is found that the highly densified P/M parts can be obtained by rotary forging process and the material properties are superior to those of the conventrional sintered parts. The detailedcomparision of the mechanical properties by rotary forging process with those by conventional process are given.

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에어-드롭 해머와 카운터블로 해머 프레스 단조공정의 기계진동 비교해석 (Comparative Analysis of Mechanical Vibrations of an Air-Drop Hammer and a Counterblow Hammer in Forging Process)

  • 김수태;최영휴;주경진
    • 드라이브 ㆍ 컨트롤
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    • 제19권4호
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    • pp.10-18
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    • 2022
  • Air-drop hammer press and counterblow hammer press are widely used power-drop forging hammersemploying different forging blow mechanisms. It is important and necessary to analyze mechanical vibrations of these two different hammers in their forging processes in order to develop high performance forging hammers. In this study, these two forging hammers were mathematically modelled as mass-spring-damper systems. For these two different types of forging hammers, the forging efficiency and mechanical vibrations due to hammer forging blow were theoretically analyzed and compared. The force transmitted to the ground was also determined and compared. Especially, effects of mass ratio and restitution coefficient on forging efficiency were investigated.