• Title/Summary/Keyword: Nc

Search Result 2,409, Processing Time 0.026 seconds

Roles and Visions of ISO14649 for STEP-NC (STEP-NC 구현을 위한 ISO 14649의 역할 및 발전 방향)

  • 한주영;장병열;조현보;서석환
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.5
    • /
    • pp.15-24
    • /
    • 2000
  • NC 기술은 하드웨어적, 소프트웨어적으로 빠르게 발전하고 있다. 소프트웨어적인 측면에서 NC제어기는 다양한 적응제어, 지능제어를 지원하는 추세이며, NC 가공기의 경우 고속가공, 정밀가공의 기능적 측면에서 발전이 이루어지고 있다. 뿐만 아니라, 컴퓨터 기술의 발전에 힘입어 NC가공을 지원하기 위한 환경(CAD, CAM, CAE) 역시 바르게 변화하고 있다. 그러나 CAM과 CNC 사이의 데이터 인터페이스는 여전히 ISO 6983(“G-Code”)이 사용되고 있다.

  • PDF

A study on the development of CNC machine using conventional NC (일반적인 NC 공작기계의 CNC화에 관한 연구)

  • 하성도;이종원;김상국
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1987.10b
    • /
    • pp.237-241
    • /
    • 1987
  • In this paper, the BTR (Behind the Tape Reader) type communication unit which interfaces the IEBM PC/XT to the FANUC 5M NC controller is developed, making it possible to send NC part program from the memory of IBM PC/XT to the NC controller. As an example of integration of CAD and CAM technologies, the machining of a two dimensional hand-written free line which incorporates the processes of geometric data acquisition using a digitizing tablet, automatic part programming and control of NC milling machine operation is demonstrated.

  • PDF

Chip Load Control Using a NC Verification Model Based on Z-Map (Z-map 기반 가공 검증모델을 이용한 칩부하 제어기)

  • Baek Dae Kyun;Ko Tae Jo;Park Jung Whan;Kim Hee Sool
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.22 no.4
    • /
    • pp.68-75
    • /
    • 2005
  • This paper presents a new method for the optimization of feed rate in sculptured surface machining. A NC verification model based on Z-map was utilized to obtain chip load according to feed per tooth. This optimization method can regenerate a new NC program with respect to the commanded cutting conditions and the NC program that was generated from CAM system. The regenerated NC program has not only the same data of the ex-NC program but also the updated feed rate in every block. The new NC data can reduce the cutting time and produce precision products with almost even chip load to the feed per tooth. This method can also reduce tool chipping and make constant tool wear.

STEP-NC milling data model and part programming (STEP-NC 밀링 데이터 모델 및 파트 프로그래밍)

  • Lee, Byeong-Eon;Jeong, Dae-Hyeok;Seo, Seok-Hwan
    • Proceedings of the Korean Operations and Management Science Society Conference
    • /
    • 2004.05a
    • /
    • pp.249-256
    • /
    • 2004
  • STEP-NC 는 기존의 G-code 를 대체할 새로운 CNC 인터페이스 언어로써 현재 밀링 공정에 대해서는 국제 표준 단계에 있으며 조만간 기존의 G-code 를 대체할 것으로 기대된다. 그러므로 국내에서도 CAD-CAM 업체, CNC maker, 공작기계 제작 업체, 사용자 등 생산 환경 전반에 걸쳐 이에 대한 대응이 시급하다. 본 논문에서는 국내에서의 STEP-NC 의 promotion 을 위해 1) STEP-NC data model 을 분석하고, 2) 파트 프로그램의 작성 방법을 자세히 설명하고, 3) STEP AP203 CAD 파일로부터 STEP-NC 파트 프로그램을 생성하는 과정을 Korea STEP-NC 시스템을 통해서 설명하였다.

  • PDF

접촉식 측정시스템에 의한 공작물의 자동인식 및 오차보상

  • 신동수;정성종
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1991.11a
    • /
    • pp.121-125
    • /
    • 1991
  • In order to minimize fixing error of workpieces, prismatic and cylindrical types. Modification Rule by Indexing Table and Modification Rule by NC Program are developed for machining centers by using touch trigger probes. The Modification Rule by Indexing Table means the alignment of workpiece to NC program through degree of freedoms of indexing table. The Modification Rule by NC Program is the alignment of NC program to workpiece set-up condition via the generation of NC program. A postprocessing module is also developed for generating NC-part Program (User Macro) to compensate for Machining errors in end milling and boring processes. Developed methods are verified by experiments.

  • PDF

Chip Load Control Using A NC Verification Model Based on Z-Map (Z-map 기반 NC 검증모델을 이용한 칩부하 제어)

  • 백대균;고태조;김희술
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.11a
    • /
    • pp.801-805
    • /
    • 2000
  • This paper presents a new method of tool path optimization. A NC verification model based Z-map was utilized to obtain chip load in feed per tooth. This developed software can regenerate a NC program from cutting condition and the NC program that was generated in CAM. The regenerated NC program has not only all same data of the ex-NC program but also the new feed rates in every block. The new NC data can reduce the cutting time and manufacture precision dies with the same chip load in feed per tooth. This method can also prevent tool chipping and make constant tool wear. This paper considered the effects of acceleration and deceleration in feed rate change.

  • PDF

NC Code Optimization Based on an Improved Cutting Force Model (향상된 절삭력 모델 기반의 NC 코드 최적화)

  • 이한울;고정훈;조동우
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1997.10a
    • /
    • pp.37-42
    • /
    • 1997
  • Off-line feed rate scheduling is an advanced methodology to automatically determine optimum feed rates for the optimization of NC code. However, the present feed rate scheduling systems have lim~tations to generate the optimized NC codes because they use the material removal rate or non-generalized cutting force model. In this paper, a feed rate scheduling system based on an improved cutting force model that can predrct cutting forces exactly in general machining was presented. Original blocks of NC code were divided to small ones with the modified feed rates to adjust the peak value of cutting forces to a constant vale. The characteristic of acceleration and deceleration for a given machrne tool was considered when off-line feed rate scheduhng was performed. Software for the NC code optimization was developed and applied to pocket machining simulation.

  • PDF

Fast NC Cutting Verification Using Graphic Hardware (그래픽 하드웨어를 이용한 NC 가공 검증의 고속화)

  • 김경범;이상헌;우윤환
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2002.10a
    • /
    • pp.616-619
    • /
    • 2002
  • The z-map structure is widely used for NC tool path verification as it is very simple and fast in calculation of Boolean operations. However, if the number of the x-y grid points in a z-map is increased to enhance its accuracy, the computation time for NC verification increases rapidly. To reduce this computation time, we proposed a NC verification method using 3-D graphic acceleration hardwares. In this method, the z-map of the resultant workpiece machined by a NC program is obtained by rendering tool swept volumes along tool pathos and reading the depth buffer of the graphic card. The experimental results show that this hardware-based method is faster than the conventional software-based method.

  • PDF

NC Program Generation Using Off-line Teaching of Deburring Path (오프 라인 티칭에 의한 디버링 NC 프로그램 생성 및 가공)

  • 김선호;박경택;윤영진;이만형;이익희
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.1
    • /
    • pp.93-100
    • /
    • 2000
  • Die-casting burr due to casting process is removed by post-process for assembly and quality control of product. Though robot has been widely used for deburring job before, CNC exclusive machine is currently developed f3r high power, high speed machining and quick tool change. Deburring tool path with complex 3D curve type is defined to make out deburring NC program. But there is no efficient method to define it currently used methods with teaching probe on machine. In this study the efficient method to make out deburring NC program is developed. 5-axis digitizing machine is used to receive data of deburring path. And the post processor for NC program generation is developed in consideration of the machining conditions. The developed system is not dependent on the skill of operator and has the advantage to maintain the flexibility of job to modify NC program due to the wear of tool and aging of the die casting.

  • PDF