• 제목/요약/키워드: High speed tool

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고속가공기의 가공성 평가방법에 관한 연구 (A Study on the Evaluative Method of Workability For High Speed Machining)

  • 이춘만;류승표;황영수;정원지;정종윤;고태조
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 추계학술대회
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    • pp.1858-1863
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    • 2003
  • The properties of a machine tool greatly affect machining quality since a machine tool has large variance in its features. Machine tool makers want to find best machining condition with the one that they have built. Machine builders need to develop test specimen since it helps finding characteristics of machine tools when the machining properties of the specimen are analyzed. This paper develops test specimen to identify features of the main spindle, the feeding device, and the frame of a machine tool. The specimen is machined with a high speed machine and the features of the machine are analyzed with test items. They are surface roughness, overshoot in axial movement, errors in circular movement, feeding with small movement, and compensational error. This work can improve usability for a machine tool in machining practice.

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TiYN코팅 고속도강 공구의 개발 및 공구수명 평가 (Development and Tool Life Assessment of TiYN Coated High Speed Steel Tools)

  • 이영문;강태봉;최수준;송태성
    • 한국정밀공학회지
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    • 제15권8호
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    • pp.33-38
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    • 1998
  • TiYN coated high speed steel tools have been developed and their tool lifes were assessed. First yttrium alloyed titanium target was manufactured, then using the arc ion plating(AIP) technique TiYN coating was deposited onto high speed steel substrate. Three kinds of varying thickness of TiYN coated tools were prepared. Cutting tests were carried out with theses tools and for comparison with the commercially available uncoated, TiN, TiCN and TiAlN coated tools. During the cutting tests flank wear width vs. cutting time was measured. It has been revealed that the newly developed TiYN coated tools show superior tool life characteristics to others.

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고속공작기계 주축의 열적거동 특성 해석 (An analysis of the thermal behaviour of a high speed machine tool spindle)

  • 고태조
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1995년도 춘계학술대회 논문집
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    • pp.9-16
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    • 1995
  • The thermal deformation of machine tool spindle influences the performance of the manufacturing systems for precision products. In this research thermal analysis of a high speed machine tool spindle with the rolling bearing and the built-in motor is carried out using Finite Difference Method. The thermal boundary conditions describing the hear generation in the bearing and built-in motor are considered in the simulation. And various convective boundary conditions are assumed with the empirical formula in the references. From the simulation results the characteristics of each element affecting the dynamic thermal behaviour of the machine tool spindle systems have been clarified. This model can be well applied to the future development of the high speed spindle systems.

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고속가공을 통한 커넥팅 로드용 금형 가공 (Die and Mold Making for Connecting Rod Parts through High Speed Machining)

  • 임유업;김정석;강명창;이득우;정융호
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 춘계학술대회 논문집
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    • pp.926-929
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    • 2000
  • Recently, there are lots of applications in machining dies using CAD/CAM systems. which results in reduction of machining time and rising of machining efficiency applying high speed machining and high quality machining. Investigation of machinability is necessary in order to apply high speed machining. In machining complicate 3D model such as connecting rod die. the need of high speed machine and coated tool is requested recently in this field. This paper introduce the database of high speed machining to improve machining efficiency of connecting rod die.

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미세가공을 위한 마이크로 공구동력계 개발 (Development of the Micro Tool Dynamometer for Micro Machining)

  • 권동회;황인옥;강명창;김전하;김정석;안중환
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.217-218
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    • 2006
  • This paper presents an investigation on the characteristics for new micro tool dynamometer by using the ultrahigh-speed air turbine spindle. Recently, the ultrahigh-speed micro flat endmilling has been investigated actively due to request of accuracy improvement and productivity of die and mould manufacturing. To perform efficient ultrahigh-speed micro flat endmilling, evaluation of ultrahigh-speed machinability must be studied preferentially and it can be identified by investigation of cutting force. The cutting forces in ultrahigh-speed micro flat endmilling can be measured by micro tool dynamometer. But general dynamometer has low natural frequency and so is improper for measuring very high frequency cutting forces in ultrahigh-speed micro flat endmilling. In this study, the micro tool dynamometer which has very high natural frequency is newly designed.

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금형용 고경도재의 고속정면밀링 가공시 CBN 공구의 성능에 관한 연구 (A Study on the Performance of CBN Tools in the Machining of Hardened Die-Materials by High-Speed face Milling)

  • 조성실;임근영;김태영
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1996년도 추계학술대회 논문집
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    • pp.26-30
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    • 1996
  • This paper presents the performance of CBN tools in the machining of hardened die-materials, SKD11 and SKD61 steel with HRC 50, by high-speed face milling. Generally, grinding or EDM is being used in machining of hardened materials but the cost is very high. If those can be replaced by cutting, it will be a greatly economical advantage. CBN tool has been recognized as an effective tool in turning, but it has not been in milling. So wear and surface roughness mode of CBN tool for hardened SKD11 and SKD61 steel were investigated by high-speed face milling in this study Also the relation between cutting force and wear mode of CBN tools was investigated.

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볼엔드밀 공구에 의한 사각형상 가공시 공구 휨에 따른 절삭력 특성 (Cutting Force Characteristics and Tool Deflection When Machining Rectangular Shapes with a Ball End Mill)

  • 김인수;김상현;이동섭;왕덕현
    • 한국기계가공학회지
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    • 제18권6호
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    • pp.26-32
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    • 2019
  • Ball end mills used for high-speed and high-precision machining require longer machining time than flat end mills or face cutters, since the tool diameter is limited and the rigidity is reduced by the characteristics of the tool's cutting edge: at the top end of the tool, the cutting speed approaches zero and hardly removes any material. Because there is little material removal at the top end of the ball end mill, the outer cutting edge performs the majority of the work; this irregular cutting force deforms the tool and shortens its life. In this study, we attached an eddy-current sensor to a tool to measure the deformation from the cutting force and we used a tool dynamometer to measure the cutting force. We found that the change in cutting force is dependent on the change in feed rate during square-shaped processing and, as the feed rate is accelerated, the cutting force also increases. Higher cutting forces increase tool deformation.

온간단조용 금형에 있어서 고속도 공구강의 적용 (Application of High Speed Tool Steel in Warm Forging)

  • 김동진
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2000년도 춘계학술대회논문집
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    • pp.75-78
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    • 2000
  • There are several effective factors to influence die life in the warm forging process. For instance process design die design and die materials etc This study presented heat treatment method which could improve toughness and wear resistance simultaneously in high temperature to apply high speed tool steels like SKH51 to die material for warm forging process. To verify the feasibility of application of heat treatment method mentioned above wear test was performed under the condition of constant time in 40$0^{\circ}C$ Wear coefficient was examined to search a relation between wear amount and time for each material and heat treatment method in 30, 60, and 130 minutes. To quantify the toughness-behavior between room and high temperature impact test was performed and heat fatigue test also fulfilled to compare with the resistance of heat check in room, 200, 400, and $600^{\circ}C$ temperature. On the basis of experimental results mentioned above high speed tool steel was applied to verify appropriateness of newly proposed heat treatment method for die of rotor pole used in automobile alternator. As a result die life of high speed tool steel applied newly proposed heat treatment is longer than that of STD61.

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Core Technologies of Next-generation Machine Tools

  • Lee, Jae-yoon
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 Handout for 2000 Inter. Machine Tool Technical Seminar
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    • pp.61-70
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    • 2000
  • This paper described the current status of machine tool technology and its future trends with a particular emphasis on high-speed machining. People in machine tool industry have continuously sought to serve fast-changing manufacturing industry with economical machining solutins. At presents, it appears that more productivity gain is demanded to shorten time-to-market and machining requirements become more stringent. In this regard, this paper firstly addressed a high-speed spindle as a key element for the next-generation machine tools. The sequel to it apparently went to high-speed feed axes and final discussion included the problem of how to optimize overall system including servo function. Lastly a brief look to NC technology including machine intelligence was taken.

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엔드밀 정밀도 향상을 위한 주변기술 연구

  • 김경배;서천석;김영경;이용인;최영근
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2002년도 추계학술대회 논문집
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    • pp.450-455
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    • 2002
  • Quality of endmill applied to high speed Machining can be classified in precision and tool life. Especially, Endmills are damaged easily when high speed machining are occurred vibration and deflection by thin and long shape of endmill, limitation of chip-pocket. Furthermore, Endmills are determined tool life by the quality of base material and the character of coating. This study have carried on research and analysis about grinding technique, circumference technique to improve precision that determine the quality of endmill. As the result of this study, that the technique is able to manufacture endmill applied to high speed Machining have been obtained.

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