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- 주제어 : 열변위 (검색결과 5 건)
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공작기계를 선택하는데 있어서 중요한 것은 생산능력, 조작의 편이성, 다양한 공작물을 가공할 수 있는 유연성, 가공정밀도 등이라고 할 수 있다. 그리고, 이중에서도 특히, 가공정밀도는 예전이나 지금이나 굉장히 중요한 공작기계의 선택기준이 되고 있다. 하지만, 어떠한 공작기계라도 공작물을 가공하게 되면 반드시 가공오차가 발생하게 된다. 이러한 가공오차를 발생시키는 원인 중, 열변위에 의한 위차오차는 전체 가공오차의 50%이상을 차지하고 있으므로. 열변위 오차를 감소시킬 수 있는 장치를 개발하는 것은 공작기계의 신뢰도를 높이고, 경쟁력 있는 고품위 공작기계의 생산이라는 측면에서 매우 의미 있는 일 이라 할 수 있다. 그래서 본 연구에서는 이 열변위 오차를 감소시키는 하나의 방법인 Z축 열변위 보정장치를 제안하게 되었다. 본 연구에서 개발된 열변위 보정장치는 열전대의 온도신호를 중폭·필터링 해주는 장치와 열변위 오차량을 예측해서 보정해 주는 장치로 구성된다. 간단하게 열변위 보정 방법을 살펴보면, 먼저 열전대로부터 온도신호를 받아서 증폭·필터링 해준 후, 이 온도데이터를 통해 열변위 오차량을 예측하고, 예측된 열변위 오차량만큼을 공작물 좌표계를 이동시켜 보정을 시켜준다. 본 연구에서 실험해본 결과, 이 열변위 보정장치로 열변위 오차를 보정하면, 보정하지 않은 상태보다 약 1/10 정토로 열변위 오차를 개선할 수 있었다. The main idea in the selection of machine tool is productivity, easy operation, flexibility, and precision. The most important decision making parameter is precision. Manufacturing error certainly comes from machine process despite of very good quality machine tool. Machine tool's positioning error by thermal error makes over 50% of these manufacturing errors. Thus, in the view point of producing a good machine tool, the important thing is that machine tool's manufacturer must increase reliability by decreasing thermal error. In the present paper, compensation device of Z-axis which is one of the method of decreasing thermal error was studied. This thermal compensation device consists of the device amplifying and filtering the determined thermal value and compensating as an amount of it. Consequently, the thermal error was improved about 1/10 compared with that of uncompensating machine tool.
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CNC 旋盤에서 BALL Screw의 熱變位 補正에 관한 硏究
홍성오 朝鮮大學校 産業大學院 1995 국내석사
Thermal expansion of ball screw in the semi-closed loop type CNC Lathe introduces positioning errors directly along the travelling axis. In this paper the thermal displacements of the ball screw were estimated by using macro variable. The estimated displacements of the ball screw were given to the NC in the form of pitch error compensation data into time interval. The thermal behaviours of ball screw of the CNC Lathe under the constant driving conditions were measured to examine the effectiveness of the displacements of the ball screw could be maintained less then 6μm positioning accaracy while using this compensation.
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垂値머시닝센터 主軸의 工具重量에 따른 熱變位特性에 關한 硏究
정우택 朝鮮大學校 産業大學院 1997 국내석사
In order to examine the thermal deformation characteristics that affect the performance of dynamic cutting accuracy according to the weight variation in vertical machining center spindle, the axial displacement and radial runout of rotating spindle were measured under the condition of variable spindle speed with variable tool weight by the He-Ne laser interferometer. As a result, the increase of tool weight affects the temperature rising, the thermal deformation, the accuracy of rotating spindle, and machining accuracy.
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고주파 스핀들의 발열량에 따른 베어링 열변위 분석에 관한 연구
김상원 경상대학교 융합과학기술대학원 2021 국내석사
In this study, to measure the actual displacement of the bearing part according to the amount of heat generated by the high frequency spindle, the displacement error of the measuring test bar and bearing part was compared and analyzed through experiment. In order to set the basic conditions for conducting this experiment, the optimal oil-air volume setting and proper external cooling capacity were selected to establish the optimal operating conditions of the spindle. In addition, the test bar is mounted on the attachment of the spindle tool, and the Z-axis displacement value of the test bar and the bearing part are obtained, and the experimental results for the two conditions are finally obtained through comparison and analysis. As a result of the experiment, there was a displacement error of 30.2 μm in the direction of the Z-axis at the test bar, and 10.8 μm in the direction of the Z-axis at the bearing area. Comparing the results of the two experiments, it was confirmed that the measured value of the spindle bearing is about 33% higher than the measured value of the test bar.
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공구 연삭기용 빌트인 스핀들의 열변위 분석에 관한 연구
표정대 경상국립대학교 융합과학기술대학원 2022 국내석사
A Study on Thermal Deformation Analysis to Built-in Spindle of Tool Grinding Machine. Recently, the production and manufacturing field require a high level of precision. Accordingly, there is an increasing demand for improvement of processing precision in the production of parts. Grinding machines are essential and essential equipment in the field of production and manufacturing. For the development of a high-precision tool grinder, it is necessary to secure a systematic grinding machine design technology that satisfies thermal-structural stability. In this study, for the development of a tool grinder for building a high-precision tool grinding system, the thermal stability of the spindle of the grinder was confirmed by analyzing the thermal displacement of the spindle, which greatly affects the precision of the grinding machine. The heat source of the grinding machine spindle was largely divided into bearings and built-in motors, and the amount of heat generated according to the operating conditions was calculated through a formula and analysis was performed. The thermal displacement of the grinding machine spindle was analyzed through thermal-structural ductility analysis, and the analysis value was verified through actual measurement.
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