• Title/Summary/Keyword: CNC Lathe Machine

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A Study on Improvement Position Error induced Thermal Deformation of CNC Lathe Using Touch Sensor (접촉 센서를 이용한 CNC 선반 열변형에 따른 위치오차 개선에 관한 연구)

  • 홍성오
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.4
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    • pp.102-106
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    • 2002
  • Development of high speed feed drive system has been a major issue for the past few decades in machine tool industries. The reduction of the tool change time as well as rapid travel time can enhance the productivity. However, the high speed feed drive system generates more heat in nature, which leads thermal expansion that has adverse effects on the accuracy of machined parts. The detail of the model proposed is described in the paper together with the experimental methodologies using a proposed compact measurement system to examine the validity of the proposed approach. The results showed the machining accuracy could be maintained to better than $\pm$ 5$\mu\textrm{m}$ while using this sensor.

Develvopment of Infeed Grinding Machine and Its Effects on Spherical Surface Grinding (구면 전용 Infeed 연삭기의 개발과 성능평가)

  • 이상직;정해도;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1028-1032
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    • 1995
  • This paper describes the manufacture of spherical and aspherical surface on glass, superalloy and ceramic components. The rotationally symmetricallenses, and the ceramic or superalloy molds with spherical shapes are mainly generated by cutting processes on CNC lathe machine or 4,5 axis CNC machining centers. Recently, spherical shape parts require more precise and efficent machining technologies for wide material range such as optical lens of the lithography device in semiconductor manufacturing processes or the high precision mold machining of anti-chemical, anti-wear materials. In this paper, we introduce a newly developed infeed grinding machine with metal with metal bonded cup type wheel and its effects on spherical surface grinding.

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CNC System Improvement Research of NC Lathe Abrasion-Based on User Defined Module (NC선반 절삭공구마모 문제점 보정을 위한 CNC 성능개선 시스템 연구)

  • Park, Eun-Sik;Kim, Han-Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.11 no.3
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    • pp.135-140
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    • 2008
  • This paper researched about Development Cutting Tool User Defined Module Based(PMCUDMS) on Simulation that was able to adapt themselves to rapid development of software and hardware to adopt. It is basic research that develops a scheme whereby technic make property. This paper theorized about to realize Cutting Tool User Defined Module Based on Simulation which is developing CNC Software flows from building Windows XP operating system's image that is possible realtime acting and multitasking to correct. And Cutting Tool User Defined Module Based on Simulation component which was consisted of basis OS, NC Code parser, Servo Motor Control, Simulator, Man-Machine Interface.

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Monitoring of Eccentric Machining Error and Cutting Force Variation using Cylindrical Capacity Spindle Sensor on CNC Turning (CNC선삭시 주축변위센서를 이용한 편심 가공오차와 절삭력 변화특성의 검출)

  • Maeng Heeyoung;Kim Sungdong
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.300-306
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    • 2005
  • This paper presents the methodology for measuring eccentricity of the machined cylindrical part using CCS(cylindrical capacitance spindle sensor) signal in the CNC turning process. We use capacitance type sensor to take full advantage of averaging effect by using large capacitance area to encompass the whole side of a sensor. The intentionally proposed initial eccentricity is applied to the experimental testpieces, and their resultant relationships between CCS orbits and eccentricities are investigated. As a result, the possibility as a automatic detection apparatus for the CNC lathe is considered based on the linearities of CCS signal and magnitude of eccentricity of machined cylindrical surfaces.

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Analysis of Dynamic Behavior and Balancing of High Speed Spindle (고속 스핀들의 동적거동과 밸런싱 해석)

  • Koo, Ja-Ham;Kwon, Soon-Goo;Kim, Jong-Soon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.1
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    • pp.238-244
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    • 2017
  • A spindle with a built-in motor can be used to simplify the structure of a machine tool system, but the rotor inevitably has unbalanced mass. This paper presents an analysis of the dynamic behavior. The spindle was used in a CNC lathe and investigated using the finite element method and transfer matrices. The high-speed spindle can be very sensitive to the rotation of an unbalanced mass, which has a harmful effect on many machine tools. Thus, a balancing procedure was performed with a spindle-bearing system for the CNC lathe by numerical analysis. The balancing was performed through the influence coefficient method, and the whirl orbit radii before and after balancing were compared to evaluate the effects. The results show that the rotational speed of the spindle seriously affects the whirl responses of the spindle. The whirl responses were also affected by other factors, such as the unbalanced mass and bearing stiffness. The balancing of the assembled spindle model significantly reduced the whirl orbit magnitude.

Development of the Wheel Disc Spinning Machine (휠 디스크 스피닝 성형기 개발)

  • Kang, Jung-Sik;Kang, E-Sok;Lee, Hang-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.6
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    • pp.58-65
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    • 1999
  • The spinning machine has been developed for a bus and truck wheel disc which is manufactured by spinning process method. This machine has the mechanical structure with bed, 2-column, cross head, 2-vertical slide, 2-horizontal slide with forming roller, clamp slide and main spindle similar to large size vertical lathe. Main spindle attached the mandrel is rotated about 500rpm drived by 280kW power DC motor, and a rotating black material pressed on the mandrel with the clamp slide is spinformed by 2-forming rollers which are attached inner end of the 2-horizontal slides. The 2-vertical and 2-horizontal slides are actuated by the hydraulic cylinder which is controlled by the servo valve individially, and these servo valves are controlled by control signal of the CNC controller which is computed with position signal feedbacked from the encoder sensor. The developed machine can manufacture wheel disc of various section profile without mandrel change because section profile is easily modified using program editing in the CNC controller processor. The wheel disc manufactured by spinning process method has many advantages that the endurance is increased by 2 times and the weight is decreased by 30% compared with a conventional disc.

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The Surface Roughness of Aluminium Material according to Cutting Conditions in the CNC Lathe Working (CNC 선반가공(旋盤加工)에서 절삭조건(切削條件)에 따른 알루미늄의 표면(表面)거칠기 변화(變化))

  • Kim, Tae-Wook;Son, Ki-Dong
    • Journal of the Korean Society of Industry Convergence
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    • v.5 no.3
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    • pp.201-208
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    • 2002
  • The machine tool which operates by hand is replacing by CNC machine tool to improve the quality of the product and the productivity in modem mechanic industry. The precision of machine part is influenced greatly the surface roughness by cutting condition of machine tool. So this study was performed to examine the aluminium surface roughness of section according to change of strength rating, nose radius, cutting speed, using live center. The results of this study are as follows; 1. In the case of 56mm diameter of test piece(length is below triple of diameter), whether establish the live center or not, doesn't influence to the surface roughness, and it is possible to make product without the live center. 2. The average surface roughness of 42mm diameter(length is quadruple of diameter) is similar to the 56mm diameter in the cutting condition of nose radius 0.8mm and cutting speed 140mm/min, but there are increases and differences in other cutting conditions. 3. In the case of test piece length more 70m/min(140m/mm) and nose radius improved greatly using the live center. 4. In the case of test piece length is quintuple of diameter, the nose radius must choose big tool and increase the cutting speed in preference live center establishment availability to improve that is surface roughness. Conclusively, if aluminum test piece length is fewer than triple of diameter, can process without establishing live center. If aluminum test piece length is more than quintuple of diameter, cutting conditions to improve surface roughness are (1) cutting speed (2) nose radius (3) whether the live center uses or not.

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A Study on the Monitoring of multi-Cutting Troubles Using an AE Sensor (AE센서에 의한 다중 절삭트러블 감시에 관한 연구)

  • 원종식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.39-45
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    • 2000
  • This paper describes the fundamental investigations on the in-process monitoring techniques focused on Acoustic Emission(AE) based on analytical method. Experiments were conducted on a CNC lathe using conventional carbide insert tools under various cutting conditions. As the result of this study a suggestion is given about the multi-purpose use of AE-signals detected with a single sensor for the monitoring of tool wear, built-up edge and chatter vibration in turning process.

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A Study on the Experimental design of Tail stock for High Precision Processing in Lathe (선삭에서 고정도 가공을 위한 심압대의 실험적 설계에 관한 연구)

  • 김경석
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.361-366
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    • 2000
  • To make high precision cutting of long materials or a piston for the engines, it must be necessary to keep the stability of spindle and tail stock in CNC lathe. If a object is clamped at the ends, the thermal expansion and cutting generated in cutting process appear as the deflection of in cuttings objects. Especially, of a piston ring, piston ovality and piston profile, the influences are very serious. In order to solve the problems most of piston cutting are worked in simply support. However, the problems exist, yet.

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The Development of the Software for the Geometry Modeling and Generating CNC Machining Data of a Piston (피스톤의 형상 모델링 및 CNC 가공 데이터 산출용 소프트웨어 개발)

  • Lee, Cheol-Soo;Lee, Je-Phil;Kim, Seong-Bok
    • IE interfaces
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    • v.12 no.1
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    • pp.68-78
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    • 1999
  • A noncircular cutting such as a piston cutting has depended on the copy-machining because of its complex shape. But the copy-machining needs a master model and brings about a low quality of the piston caused by being worn out of the master model. And the lower cutting speed reduces the productivity. In this paper, for solving these problems, a specialized software system and its subsequent procedure are presented. The shape of a piston consists of an oval, an offset, recesses, and eccentricities. The paper describes these shapes as a consistent equation that is a function of the rotational angle and the position of longitudinal direction(Z-axis). It is simple to define the characteristic geometry of a piston and to generate a tool path for CNC machining. This paper proposes the a proper structure of a 4-axes CNC(Computerized Numerical Control) lathe for machining the piston. As well as X-axis and Z-axis, are attached to the machine a C-axis for rotation and a Y-axis for higher speedy prismatic motion parallel to X-axis.

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