• 제목/요약/키워드: Steel cutting

검색결과 530건 처리시간 0.024초

센서퓨젼 기반의 인공신경망을 이용한 드릴 마모 모니터링 (Sensor Fusion and Neural Network Analysis for Drill-Wear Monitoring)

  • ;권오양
    • 한국공작기계학회논문집
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    • 제17권1호
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    • pp.77-85
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    • 2008
  • The objective of the study is to construct a sensor fusion system for tool-condition monitoring (TCM) that will lead to a more efficient and economical drill usage. Drill-wear monitoring has an important attribute in the automatic machining processes as it can help preventing the damage of tools and workpieces, and optimizing the drill usage. In this study, we present the architectures of a multi-layer feed-forward neural network with Levenberg-Marquardt training algorithm based on sensor fusion for the monitoring of drill-wear condition. The input features to the neural networks were extracted from AE, vibration and current signals using the wavelet packet transform (WPT) analysis. Training and testing were performed at a moderate range of cutting conditions in the dry drilling of steel plates. The results show good performance in drill- wear monitoring by the proposed method of sensor fusion and neural network analysis.

고경도강(SKD11)의 고속가공에서 가공성 평가 및 감시 (Monitoring and machinability evaluation in high-speed machining of high hardness steel(SKD11))

  • 김전하;김경균;강영창;김정석;김기태
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 춘계학술대회 논문집
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    • pp.987-990
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    • 2000
  • In modern manufacturing industry such as aerospace, vehicle and die/mold industry, the high hardness malarial which is remarkable in aspects of durability is effectively used. The high-speed and precision machining technology has been applied in these fields. In this study, efficient sensors in high-speed machining by observing similar tendency through comparing cutting force with AE signal, gap sensor signal and accelerometer signal are selected, and machinability of high-speed machining is experimentally evaluated. We performed a basic research for sensing system construction to monitor a machine tool and machining condition.

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PC-CADRA에서 내부재 부재(PIECE) 네스팀 S/W개발에 관한 연구 (A study on the nesting S/W development of piece with PC-CADRA)

  • 박제웅;한창봉;이현상
    • 한국해양공학회지
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    • 제11권4호
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    • pp.239-248
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    • 1997
  • The nesting of parts cut on raw steel plate has been a subject of interest to the shipbuilding industry for many years. "Nesting" is defined operation of layout of the parts on the raw material with minimizing the waste rate. Therefore, it is very important to optimize the cutting area. Since the existing nesting programs are prepared for expensive workstations and the expert, it is needed to develop nesting program for personal computer to improve the technology of small/middle sized shipyards and their productivity. This study involves development and application of appropriate optimization technique to solve the problem of plate nesting. And the appropriate D/B for storing nesting data developed, the function of D/B is introduced in this paper.his paper.

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Lorentz force 형태의 EMAT센서 개발에 관한 연구 (A Study of Development for EMAT sensor of an Lorentz force type)

  • 정영재
    • 한국생산제조학회지
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    • 제7권2호
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    • pp.9-14
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    • 1998
  • One of the areas in the continuous casting process that up to this point, has not been definitively instrumented is a method of reliably locating the part of a continuously cast strand that remains liquid for a period after the outer portion has solidified. To solve the problem. Electromagnetic Trandsducers(EMAT) which operate across an air gap without the need for a coupling medium has been developed. The system was designed to employ a through transmission technique which enhanced the signal-to-noise ratio. The Al 75$\times$75mm and 75$\times$100mm simulators with 2, 4, 8, 16, 32 mm hole respectively has been produced in order to verify the developed EMAT system and to measure to liquid core in continuous casting strand. The system developed can be employed for the optimization of torch cutting speed and for the final cut length of the bloom as well as calculation of average bloom temperature.

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High power CO$_{2}$laser beam welding of ASIA 316 stainless steel

  • 김재도;조용무
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1991년도 춘계학술대회 논문집
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    • pp.321-327
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    • 1991
  • High power laser beams are used in a wide variety of materials processing applications such as cutting, welding, drilling and surface treatment. The CO$\sub$2/ laser is increasingly used in laser beam welding because of the highly potential advantages. High power laser welding is a high energy density, no filler metals and low heat input process to join metals. As the comparison with the conventiona welding, precision work and good fit-up to join the metals are required and maintenance is expensive at present. The principal variables of laser beam welding are the laser beam power, travel speed and bean spot size. The penetration depth during laser beam welding is directly related to the power density of the laser beam. Generally, for a constant beam size, the penetration depth increases with increasing laser beam power.

분사주조 성형체의 기공형성에 대한 기판재료의 영향 (Effects of Substrate Materials on the Porosity Formation of Spary Cast Deposit)

  • 김동규
    • 한국주조공학회지
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    • 제13권5호
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    • pp.476-483
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    • 1993
  • The influence of substrate materials on the degree of basal porosity during spray casting process has been investigated. Different conditions of droplet spreading on the substrate were induced by varying the substrate material. Flat sections of cast iron and aluminum have been spray deposited via spray casting process onto an aluminum substrate, a low carbon steel substrate, and an alumina based refractory substrate. Results for cast iron and aluminum sprayed onto the aluminum substrate showed significant improvements in the surface condition and degree of basal porosity with evidence of substrate deformation that round pits ranging from $5{\mu}m$ to $20{\mu}m$ in diameter are distributed on the surface of aluminum substrate. The lowest level of porosity was developed in alumina based refractory material. Several mechanisms for porosity formation were discussed with droplet impact pressure and droplet spreading. Adopting a spray cutting mechanism for removing the periphery of spray cone, porosity level was remarkably decreased.

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설계모델정보를 이용한 용접로봇 OLP 시스템 구축 사례 (An Establishment Case of Welding Robot OLP System Using 3D Design Model Information)

  • 오성권;최범호;은선호;성창제
    • 대한조선학회 특별논문집
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    • 대한조선학회 2007년도 특별논문집
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    • pp.43-47
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    • 2007
  • In this paper, we will introduce how we utilize 3D design model information at factory automation field with welding robot OLP system which is in using at out shipyard. At this area, so far, most of design information is used in NC data generation for steel cutting, but we can utilize 3D model information at more wide and complex area likes robot welding. Moreover, OpenGL which is a graphic library can be possible to verify robot NC data is correct or not through 3D simulation even if some one is not a expert at robot handling.

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종강도 및 Bottom Damage를 고려한 300K VLOC의 최적구획검토 (Study on Optimum Compartment of 300K VLOC Considered Longitudinal Strength and Bottom Damage)

  • 박지윤;구자원
    • 대한조선학회 특별논문집
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    • 대한조선학회 2011년도 특별논문집
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    • pp.39-42
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    • 2011
  • The last years have seen a dramatic increase of the new-building orders for Very Large Ore Carriers(VLOC), mainly driven by the increasing demand for iron ore imports from Australia and brazil to the steel mills in china. Thus the vibrant research of VLOC aimed cost-cutting by optimum compartment have conducted in recent years. In this study, we are also trying to find ways to reduce longitudinal strength by optimum compartment and check additionally whether the modified compartments were satisfied with SOLAS bottom damage.

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치과용(齒科用) Cement가 Pin Retention에 미치는 영향(影響)에 관(關)한 실험적(實驗的) 연구(硏究) (AN EXPERIMENTAL STUDY ON PIN RETENTION OF THE DENTAL CEMENTS)

  • 김성간
    • 대한치과보철학회지
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    • 제13권1호
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    • pp.23-26
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    • 1975
  • The purpose of this study was to measure the retentive force of various kinds of dental cement. Cross-cutting the half of the occlusal surface, pinholes were prepared on the dentin with No. 557 carbide bur. No. 557 steel burs were cemented in the pinholes and retentive force was measured by removing the burs with Instron testing machine. The Instron testing machine was operated at a rate of 0.2 cm per minute. The following results were obtained : 1. The retentive force of zinc phosphate cement(A), reinforced zinc oxide and eugenol cement and polycarboxylate cement were similar to each other, but that of zinc phosphate cement (A) was the highest of all. 2. The retentive force of zinc phosphate cement (B) was the lowest of all.

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AZ31 마그네슘합금의 레이저 용접성에 미치는 공정변수의 영향 (Effect of Process Parameters on Laser Weldability of AZ31 Magnesium Alloy)

  • 김종도;길병래;이정한
    • Journal of Advanced Marine Engineering and Technology
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    • 제32권4호
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    • pp.570-577
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    • 2008
  • Magnesium alloys are potentially useful as structural materials due to higher strength/weight ratio, heat conductivity and recyclability compared to other alloys. These alloys have attracted the interest of modern manufacturing such as the automobile, computer, communication and consumer electronic appliances industries. Hence welding techniques are required to be developed for these applications. Laser are known to be an excellent tool for them. This paper presents the laser weldability of AZ31 magnesium alloy with CW Nd:YAG laser. The low viscosity and surface tension of the melt pool make magnesium more difficult to weld than steel. As a result of this study, optimal process parameters could be obtained without weld defects. Also it was certain that cutting methods had influence on butt weldability.