• 제목/요약/키워드: Machining Characteristics

검색결과 1,093건 처리시간 0.031초

Al-Li 합금 윙립의 고속가공 변형특성에 관한 연구 (A Study on High Speed Machining Distortion Characteristics of Aluminum Lithium Alloys Wing Rib)

  • 이인수;김해지
    • 한국기계가공학회지
    • /
    • 제13권6호
    • /
    • pp.111-118
    • /
    • 2014
  • Aluminum lithium alloys are new materials developed for lightweight aircraft parts. However, as compared with conventional aluminum alloys in high-speed machining, problems such as tool wear, machining distortion, and cutting ability arise. This study presents the machining distortion characteristics of an Al-Li alloy wing tip in relation to the cutting heat in high-speed machining. A machining experiment was conducted with high-speed machining equipment for an evaluation of the machining distortion characteristics, with each machining stage temperature change of the workpiece machining surface, and the inside and outside temperature changes of the equipment measured. By measuring the amount of distortion of the workpiece before and after machining, the cutting heat was analyzed with regard to its effect on machining distortion in the product.

볼엔드밀 절삭에서 전해복합에 의한 절삭력 저감 특성 (Cutting Force Reduction Characteristics by Compounding Electrolytic Machining in Ball End Milling)

  • 이영표;박규열
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
    • /
    • pp.268-273
    • /
    • 2000
  • In this report, a new method compounding the electrolytic machining with ball end milling process to increase the machining efficiency was introduced. And the cutting characteristics by electrolytic machining conditions was examined. From the experimental results, it was confirm-ed that effect of cutting force reduction obtained at the condition of transpassive state of electrolytic machining conditions.

  • PDF

Abrasive-Assisted High Energy Water-Jet Machining Characteristics of Solid Wood

  • Lee, Hyoung-Woo
    • Journal of the Korean Wood Science and Technology
    • /
    • 제32권3호
    • /
    • pp.1-7
    • /
    • 2004
  • The application of abrasive-assisted high energy water-jet was investigated as a possible new method of cutting wood. In this study the maximum cutting speeds for species of various wood density were determined and water-jet machining characteristics were investigated for sixteen Korean domestic species. The maximum cutting speed ranged from 200 to 750 mm/min. The results indicate that wood density affects machining characteristics such as maximum cutting speed, surface roughness, and kerf width. Roughness of surface generated increased and kerf width decreased as penetration depth increased.

집속이온빔에 의한 미세가공 특성 (Micro-machining Characteristics using Focused Ion Beam)

  • 이종항;박철우;이상조
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2003년도 춘계학술대회 논문집
    • /
    • pp.636-639
    • /
    • 2003
  • It is difficult to machine below 10 micrometers by conventional machining methods, such as micro-EDM. However, ultra micro machining using focused ion beam(FIB) is able to machine to 50 nanometers. In addition, 3 dimensional structures can be made by a combination of FIB and CVD to the level of 10 nanometers. Die & moulds techniques are better than one-to-one machining techniques in the mass production of ultra size structures, in regards to production costs. In this case, the machining precision of die & moulds affects produced parts. Also, it is advantageous to machine die & moulds to the 10 micrometer level by FIB technique rather than other techniques. In this paper, the grooving characteristics for die & mould materials by FIB were carried out experimentally in order to compare the machining characteristics of FIB with conventional machining methods. The results showed that the machining parameters and the scanning path of FIB affects the precision. The machined width and depth of the groove varied depending on the required depth due to the redeposition of the sputtered ion material accumulating on both the bottom and the side of the wall.

  • PDF

초음파에 의한 고 세장비 유리가공 특성 (Characteristics of High-Aspect-Ratio Ultrasonic Machining of Glass)

  • 신용주;김헌영;장인배;김병희;전병희
    • 소성∙가공
    • /
    • 제11권7호
    • /
    • pp.608-613
    • /
    • 2002
  • An ultrasonic machining process is efficient and economical means for precision machining of glass and ceramic materials. However, the mechanism of the process with respect to the crack initiation and propagation and the stress development in the ceramic workpiece subsurface arc still not well understood. In this research, we have investigated the basic mechanism of ultrasonic machining of ultrasonic machining of glass by the experimental approach. For this purpose, we designed and fabricated the desktop micro ultrasonic machine. The feed is controlled precisely by using the constant load control system. During machining experiments, the effects of abrasive characteristics and machining conditions on the surface roughness and the material removal rate are measured and compared.

초정밀 공작기계를 이용한 미소부품의 가공특성 (Machining Characteristics of Micro-parts using the Ultra-precision Machine Tools)

  • 이재종;이응숙;제태진;이선우
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2001년도 춘계학술대회 논문집
    • /
    • pp.858-861
    • /
    • 2001
  • As the application fields of micro parts that are micro endo-scope, PDA, and tele-communication had been extended, there are required the micro machine tools and MEMS in order to machining for those parts. In order to machining of the micro parts, the micro machining center is very effective. The micro machining center had some advantages that are lower cost, higher accuracy, and lower required powers than existing machine tools for machining of micro parts. In this study, in order to analyze the machining characteristics and its application possibility of the developing micro machining center with 60,000rpm rotations, 0.1$\mu\textrm{m}$ resolutions, and 80 50 50mm sliding unit, the machining experiment had been executed. In this experimental machining, 0.1~ 0.5mm endmills are used to machining the micro cap and tele-communication's parts. In the future, experimental results will be adapted to the micro-machining center.

  • PDF

Ni-Ti 형상기억합금의 전해가공과 형상복원 특성의 관계 (Relationship between Shape Recovery Characteristics & Electro Chemical Machining of Ni-Ti Shape Memory Alloy)

  • 최영수;박규열
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2001년도 춘계학술대회 논문집
    • /
    • pp.1097-1100
    • /
    • 2001
  • In this paper, the electro-chemical-machining characteristics of Ni-Ti Shape Memory Alloy(SMA) was investigated. From the experimental results, the optimal electro chemical machining conditions for satisfying the machining quality(fine surface & high recovery stress) might be confirmed. And it was concluded that optical electro chemical condition for Ni-Ti SMA could be obtained at approximately 100% current efficiency and high frequency pulse current.

  • PDF

금형의 고정도ㆍ고능률 가공기술 (Advanced Machining Technology for Die Manufacturing)

  • 김정석;이득우;정융호;강명창;이기용;김경균;김석원
    • 한국정밀공학회지
    • /
    • 제17권4호
    • /
    • pp.48-68
    • /
    • 2000
  • The high-speed machining technology of difficult-to-cut material is needed to achieve the high-efficiency of die manufacturing. The high-speed machining is applied in automobile, airplane and electricityㆍelectro industry etc, because it can improve machining efficiency and productivity with high speed, high power and high rotation. In this study, high speed machinability, tool wear characteristics and its monitoring, characteristics of damaged layer, machinability of difficult-to-cut material, characteristics of a free curved surface and method of CAD/CAM system were introduced to acquire the shortening of machining time, the improvement of machining efficiency and the high quality of machined surface. Therefore, we establish the stabilization condition of difficult-to-cut material machining and present the optimal cutting condition for high-efficiency cutting.

  • PDF

보간 길이 최적화에 의한 5축밀링 가공속도 향상 (Machining Speed Enhancement for 5-Axis Milling by Step Length Optimization)

  • 소범식;정융호
    • 한국CDE학회논문집
    • /
    • 제11권6호
    • /
    • pp.422-428
    • /
    • 2006
  • In this paper, an NC data optimization approach for enhancing 5-axis machining speed is presented. It is usual to use expensive commercial CAD/CAM programs for NC data of 5-axis machining, since it needs very large calculations for optimal tool positioning and orientation, tool path planning, and collision-free tool path generation. Since commercial CAD/CAM systems have similar functions and efficiency based on common algorithms of reliable theories, they do not have their own unique features for machining speed and efficiency. In other words, most commercial CAD/CAM systems consider only the characteristics of part geometry to be machined, which means that they generate almost the same NC data if the part to be machined is the same, even though different machines are used for the pin. A new approach is proposed for optimizing NC data of 5-axis machining, which is based on the characteristics of the machine to be operated. As a result, the speed of 5-axis machining can increase without losing machining accuracy and surface quality.

기계 특성에 근거한 5축 밀링가공 시간의 예측 (5-axis Milling Machining Time Estimation based on Machine Characteristics)

  • 소범식;정희진;정융호
    • 한국CDE학회논문집
    • /
    • 제12권1호
    • /
    • pp.1-7
    • /
    • 2007
  • In this paper, we present a machining time estimation algorithm for 5-axis high-speed machining. Estimation of machining time plays an important role in process planning and production scheduling of a shop. In contrast to the rapid evolution of machine tools and controllers, machining time calculation is still based on simple algorithms of tool path length divided by input feedrates of NC data, with some additional factors from experience. We propose an algorithm based on 5-axis machine behavior in order to predict machining time more exactly. For this purpose, we first investigated the operational characteristics of 5-axis machines. Then, we defined some dominant factors, including feed angle that is an independent variable for machining speed. With these factors, we have developed a machining time calculation algorithm that has a good accuracy not only in 3-axis machining, but also in 5-axis high-speed machining.