• Title/Summary/Keyword: 절삭속도

Search Result 70, Processing Time 0.153 seconds

An Evaluation of Skiving Cutting Characteristics of TiCN PACVD Coating Caribide Hob (TiCN PACVD코팅 초경호브의 Skiving절삭특성 평가)

  • Cheon, Jong-Pil
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.13 no.2
    • /
    • pp.471-477
    • /
    • 2012
  • SCM420 steel tempered after performing gear hove PACVD carbide coating on the surface after the cutting surface hardness was high. Difficult-to-cut, without coating is classified as mild as large, including materials like mild, high strength that improves tool life and productivity have limited availability. Drive to improve it in the TiCN-coated carbide call for war to the finish coating on cutting a hob skiving good workability, tool wear less, 2.5-fold increase in tool life results were obtained. Experiments using CNC Skiving hobbing machine with wet cutting conditions, cutting speed and feed rate to apply a variety of the tool wear and surface roughness data were obtained. Results from condition 2 (V = 200m/min F = 0.7mm/rev) cutting speed feed mark the cutting surface microstructure and surface roughness Rmax $4.7{\mu}m$(Ra $1.19{\mu}m$) of the data was obtained.

Evaluation of Cutting Characteristics in Bulk Metallic Glasses (벌크비정질합금(BMG)의 절삭특성 평가)

  • Shin, Hyung-Seop;Choi, Ho-Yeon
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.36 no.6
    • /
    • pp.591-598
    • /
    • 2012
  • In this study, the cutting characteristics of bulk metallic glass (BMG) cut using a computer numerically controlled (CNC) lathe were investigated for different insert tool materials and cutting speeds. The surface roughness, chip morphology, cutting forces, and tool wear during turning of $Zr_{50}Cu_{40}Al_{10}$ BMG alloy were examined. Four kinds of tool materials were used to cut an 8-mm-diameter BMG. The examination of the surface roughnesses of the BMG specimens machined at each cutting speed showed that the surface roughness became better as the cutting speed increased, and the tool materials also influenced the surface roughness. The chip morphology investigations showed that the unoxidized BMG chips had serrated curled chips with adiabatic shear bands, while the oxidized chips exhibited local melting and tangling rather than the usual spiral-shaped chips. The cutting force induced during machining of the Zr-based BMG was the largest for the TiN-WC tool, followed by the polycrystalline diamond (PCD) tool. The cermet tool exerted the smallest cutting force.

A Study on the End Mill Wear Detection by the Analysis of Acoustic Frequency for the Cutting Sound(KSD3753) (합금공구강재의 절삭음 음향주파수 분석에 의한 엔드밀 마모 검출에 관한 연구)

  • Lee Chang-Hee;Kim Nag-Cheol
    • Journal of the Institute of Convergence Signal Processing
    • /
    • v.5 no.4
    • /
    • pp.281-286
    • /
    • 2004
  • The wear process of end mill is a so complicated process that a more reliable technique is required for the monitoring and controling the tool life and its performance. This research presents a new tool wear monitoring method based on the sound signal generated on the machining. The experiment carried out continuous-side-milling for using the high-speed steel end mill under wet condition. The sound pressure was measured at 0.5m from the cutting zone by a dynamic microphone, and was analyzed at frequency domain. The tooth passing frequency appears as a harmonics form, and end mill wear is related with the first harmonic. It can be concluded from the result that the tool wear is correlate with the intensity of the measured sound at tooth passing frequency estimation of end mill wear using sound is possible through frequency analysis at tooth passing frequency under the given circumstances.

  • PDF

A study on optimum of cutting ability with change of tool rake angles (바이트 인선각의 변화에 따른 절삭성의 최적화 방안에 관한 연구)

  • 염성하;오재응;현청남
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.12 no.5
    • /
    • pp.1043-1054
    • /
    • 1988
  • The optimum cutting condition of rake angle in turning was investigated in SM45C and SM20C. Results of experiments in SM45C and SM20C are as follow. Specific cutting resistance became higher as the depth of cutting, feed or cutting velocity decreases at same rake angle and resistance became low value at 20.deg.(SM45C), 10.deg.(SM20C). The optimum cutting condition for SM45C is depth of cutting 0.7mm, rake angle 30.deg., cutting velocity 200mm/min, feed 0.1mm/rev, and for SM20C is depth of cut 0.5mm, rake angle 10.deg., cutting velocity 150mm/min, feed 0.1mm/rev.The rake angle for good roughness is 15.deg for SM45C, and that for SM20C is 25.deg. The roughness is influenced by feed and it has the lowest value at 0.1mm/rev and the cutting condition is closely related with the change of cutting velocity and feed.

Evaluation of the Economics of High Speed Machining Considering Environmental Effects (환경영향을 고려한 고속절삭가공의 경제성 평가)

  • Chang, Yoonsang;Kim, Sun-Tae
    • Clean Technology
    • /
    • v.12 no.3
    • /
    • pp.182-189
    • /
    • 2006
  • In this study, high speed machining is evaluated with regard to economical and environmental effects. Considering environmental loads, machining costs are analyzed with the mathematical models of machining economics and cutting fluid loss. Data from the tool life experiments of high speed milling and turning are used for the analysis. The analysis of high speed milling shows that the machining cost decreases as increasing the cutting speed. In turning process, the cooling method using cutting fluid shows the minimum machining cost. Considering both machining and environmental costs, cooling method using cold air is superior to other methods.

  • PDF

A Point of Production System for Semiconductor Wafer Dicing Process (반도체 웨이퍼 다이싱 공정을 위한 생산시점 정보관리시스템)

  • Kim, In-Ho
    • Journal of the Korea Society of Computer and Information
    • /
    • v.14 no.10
    • /
    • pp.55-61
    • /
    • 2009
  • This paper describes a point of production(POP) system which collects and manages real-time shop floor machining information in a wafer dicing process. The system are composed of POP terminal, line controller and network. In the configuration of the system, LAN and RS485 network are used for connection with the upper management system and down stratum respectively. As a bridge between POP terminal and server, a line controller is used. The real-time information which is the base of production management are collected from information resources such as machine, product and worker. The collected information are used for the calculation of optimal cutting condition. The collection of the information includes cutting speed, spout of pure water, accumulated count of cut in process for blade and wafer defect. In order to manage machining information in wafer dicing process, production planning information is delivered to the shop floor, and production result information is collected from the shop floor, delivered to the server and used for managing production plan. From the result of the system application, production progress status, work and non-working hour analysis for each machine, and wafer defect analysis are available, and they are used for quality and productivity improvements in wafer dicing process. A case study is implemented to evaluate the performance of the system.

  • PDF

Components Analysis of Surface Roughness in Turning Process by Frequency Analysis (주파수 분석에 의한 선삭면의 표면 거칠기 인자 해석)

  • Kim, Gyung-Nyun
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.16 no.3
    • /
    • pp.184-191
    • /
    • 1996
  • The purpose of this paper is to investigate components of surface roughness in turning with respect to the tool configuration and the changes of working conditions. Tool configurations of SNMG120404, SNMG120408 and DNMG150404, DNMG150408 are used, and working conditions such as cutting speed 3nd feed are varied. That is, the changes of cutting speed and feed were 150, 200, 250 m/min and 0.05, 0.1, 0.3 mm/rev, respectively. From the results obtained by the frequency analysis with spectrum, it is noted that the surface roughness was influenced most significantly by the feed. It is also observed that the vibration of bite had an effect on both the surface roughness and the surface waviness. Moreover, the influence of surface roughness increases as the feed decreases. Lastly, the vibration of the spindle was found to have little influence on the surface roughness in normal cases and the tool configuration was not the components of the surface roughness.

  • PDF

A Study on the Tool Wear and Prediction of CBN, Poly Crystal and Single Crystal Diamond Tools in Cutting of Nickel (니켈절삭시 CBN, 소결 및 단결정 다이아몬드 공구의 마멸과 예측에 관한 연구)

  • 성기석;김정두
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.17 no.1
    • /
    • pp.120-130
    • /
    • 1993
  • Generally, the machinability of materials that have a good mechanical properties is poor. For materials having a high strength, high toughness, high strength in high temperature and wear resistance, it is difficult to remove a chip from work materials. These properties are well shown in a Nickel, so this metal is used in machine materials, semi-conductor industry, metal mold and optical fields etc. But it is limitted in use because of high cost and poor machinability. In this study, the cutting of pure Nickel was conducted to examine wear of CBN, poly crystal diamond (PCD) and single crystal diamond (SCD) tools. From the result, the CBN tool is superior to poly crystal diamond tools or single crystal diamond tools in terms of tool wear and tool wear is predictable from experimental data base.

방사성폐기물시멘트고화체 코아시편채취장치의 성능평가

  • Gwak, Gyeong-Gil;Kim, Tae-Guk;Yu, Yeong-Geol;Je, Hwan-Gyeong;Park, Jun-Seok;Lee, Seung-Gu
    • Proceedings of the Korean Radioactive Waste Society Conference
    • /
    • /
    • pp.109-110
    • /
    • 2009
  • "드럼 코아시편 채취장치" 는 침출/내수성 시험, 압축강도 측정시험, 열 순환 시험등 의 파괴적 물성시험을 수행하기 위해서 경질(시멘트 고화체) 및 연질(파라핀왁스) 등의 방사성폐기물드럼으로부터 코아 시료를 채취하는 장비이다, 시편채취의 최대길이는 860 mm 이며 코아 시편의 직경은 50~200 mm 이며 일반적으로 "방사성폐기물 고화체의 물성시험"에 사용되는 시편은 실험실적으로 제조한 소규모 모의 고화체 시편과 고화공정에서 직접 채취한 소규모 시편, 200L 드럼으로부터 코아시편을 채취 가공하여 만든 시편과 같이 3종류가 있다. 고화공정에서 발생되는 고화체는 일반적으로 200 L 드럼에 주입되며, 고화체의 균일성 정도는 고화공정의 특성, 폐기물/고화매질 혼합비, 200 L 고화체 드럼의 냉각방식에 따라 다르다. 따라서, 실험실에서 제조한 시편과 공정에서 채취한 소규모시편은 실제 고화공정을 대표할 없으며 또한 실제 발생된 고화체의 조성과도 동일하다고 볼 수 없다. 따라서 200 L 드럼으로부터 코아시편을 채취하여 만든 시편이 고화공정과 고화체를 대표할 수 있는 시편으로 볼 수 있다 그러므로 고화체 및 고화공정을 대표할 수 있는 코아시편을 채취할 수 있는 장치를 제작하여 다양한 코아시편을 200 L 고화체 드럼으로부터 수직 코아시편을 채취할 필요가 있으며 실험에서 코아시편 채취속도와 연관된 Z-AXIS 의 Rpm은 운전범위는 0-2000 Rpm 이나 이때 너무 빠른 속도는 기계에 치명적인 손상을 초래 할 수 있으므로 위험한 것으로 나타났으며 500-1000 Rpm 의 속도가 적합한 것으로 시험되었으며 시편을 절삭하는 Spindle의 Rpm은 운전범위는 0-1500Rpm 이나 무리한 운전을 피해 가장 적절한 Speed로 운전해야하며 시험결과 500-800Rpm 이 최적운전범위로 나타났다 또한 시멘트고화체에서의 코아 채취시험에서는 Spindle의 속도는 500 Rpm, Z -AXIS 의 Rpm은 900 Rpm이 가장 적합한 것으로 나타났으며 성능평가시험을 통하여 비트부의 절삭속도와 Z축의 이동속도에 관한 그라프를 획득하였으며 시편의 크기에 따라서 Spindle의 속도를 증감하여야함을 확인할 수 있었다.

  • PDF

A Study on the Coated Characteristics of Ceramic Tools (세라믹공구 재료의 피복특성에 관한 연구)

  • Lee, Myeong-Je;Im, Hong-Seop;Yu, Bong-Hwan
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.24 no.4
    • /
    • pp.900-906
    • /
    • 2000
  • Ceramic, PCD and CBN tools are available for the difficult-to-cut-materials such as hardened carbon tool steel, stainless steel, Inconel 718 and etc. Ceramic tools are likely to be chipped and abruptly broken before the appearance of normal wear in turning. Ceramic tools are suitable for continuous in turning, not for intermittent in milling. In this study, TiN/TiCN multi-layer coated ceramic tools were found to restrain the chipping, breaking and early fracture and to increase the critical cutting speed owing to TiN/TiCN multi-layer coating in Arc Ion Plating of PVD method.