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.

고중량물 핸들링용 수직다관절 로봇 설계

이도승 경상대학교 대학원 2019 국내석사

In recent years, medium to large scale transportation machinery and machine tool manufacturing process lines have shown a trend towards centralization, softening, lightening, and slimming to reduce costs and increase productivity. This has increased demand for the vertical articulated robot. Also, compared to the automobile production line with high automation rate, the robot automation rate is extremely low in the manufacturing process of medium and large scale transportation machines such as commercial vehicles, railroad cars, and construction equipment. Therefore, when developing and introducing a heavy-weight handling robot that can be easily applied to existing production lines, it is expected to have a great effect in securing industrial competitiveness by solving industrial obstacles such as a decrease in productivity due to heavy work and risk of accident. In this study, we design a 6-axis robot mechanism with heavy load handling of 700kg or more for large sized materials supplied in small quantity of various types. We propose a new mechanism by analyzing the existing high priced robot 's gravity compensator.

트랜스퍼 기어박스의 구동기어 최적 설계에 관한 연구

송명진 경상대학교 교육대학원 2019 국내석사

Gears are mechanical element parts with excellent power transmission efficiency and are widely used in automobile, industrial machinery, aviation industry and machine tools. In order to improve the performance of the gear, it is necessary to carry out optimization design of the gear geometry. In this paper, to optimize the geometric tooth profile of helical gears among the gears of the transfer case gearbox, the gears are modeled using the finite element program, Romax Designer, to analyze the load and gear teeth of the gearbox power transmission system. The optimized gears were fabricated and compared with the results of the gear tests.

고정도 볼스크류 이송시스템의 성능향상에 관한 연구

최창 경상대학교 대학원 2015 국내박사

In a machine tool, the three major types of errors are geometric, thermal and cutting-force included errors. Thereinto, the geometric errors make up the major part of the inaccuracy of a machine tool, the error caused by cutting forces depending on the types of tool and work piece and the cutting conditions adapted. In a machine tool, continuous usage causes heat generation at the moving elements and this heat causes expansion of the various structural elements of the machine tool. It is this expansion of the structural linkages of the machine that leads to inaccuracy in the positioning of the tool. Such errors are called thermal errors and constitute a significant portion of the total error in a machine tool. Thus the overall volumetric error of a machine tool is not only dependent on errors due to the assembly and the specific kinematic structure of the machine but also on the thermal errors. As a tried and tested technology, ball screw drive systems are still used in a majority of machine tools which can meet the demands of higher productivity and tight part tolerances due to their low cost and high degree of stiffness. Ball screw is a precision mechanical linear actuator that uses steel balls between a screw shaft and a nut to transfer the motion which convert rotary into linear movement when screw is rotated. Different from any conventional power transmission screw, which needs to overcome sliding friction between the screw and the nut threads, ball screw operates similar to bearing components could achieve high mechanical efficiency since it moves in relatively low rolling friction. Ball screw is the key contributor to the thermal error of a machine tool which leading to dimensional error of machined work-piece. In order to eliminate geometric error, thermal error and noise error of ball screw feed drive system, series of works were done in this paper. In geometric error elimination, using the method of ball screw groove surface finishing, groove surface grinding process optimization and groove surface lapping technology were developed. In thermal error elimination, the nut and screw liquid cooling method were used to control heat generation of ball screw system. And a series of tests contains axial deformation, positioning accuracy, temperature variation and temperature distribution was carried out in the certain working condition to verify the performance of the such cooling system. And in the noise error elimination case, improvement of circulation method was used. As the results, the such methods of error elimination of ball screw feed drive presented excellent performance improvement.

CNC머신 가공 Tool의 구동기어 치형최적 설계에 관한 연구

백권인 경상대학교 대학원 2019 국내석사

Gear has been used in machine elements as part of power transmission in many kinds of machines. The performance of a gear has a influence on the performance and accuracy of the machine. Therefore, research on gear has been actively carried out so far. In order to improve the performance of the gear, I carried out optimization design of the gear geometry. In this paper, I used Romax Designer to optimize the gears in cross Drilling / milling unit. Romax Designer is a dedicated gearbox design and analysis program. The geometry of the gear is repetitively modified by micro geometry method, and at the same time the transmission error is checked to make an optimized gear shape. It was confirmed that the stress distribution of all the spur gears was concentrated at one end of the gear tooth surface, while the stress distribution was shifted from the one end to the center of the tooth surface after the optimum design. The transfer error and maximum stress were also reduced after the gear tooth surface was modified. All of these processes reduce trial and error before producing real gears.

A Study on the Stiffness and Thermal Characteristics in 5 Ton Class Worm Gear Reducer

전창민 경상대학교 대학원 2019 국내석사

Reducer is a device that provides and changes torque and speed coaxially from a drive shaft to excellent transmission efficiency, and is widely used in many fields today. There are various types of Reducer, each using a gear, a belt, and a chain in the type of power transmission system, and reducer with gear is most widely used. The worm reducer is capable of quadrature power transmission when the shafts are disposed at right angles to each other. Since a large reduction ratio can be obtained up to about 1/100 and the sliding movement is performed during operation compared to other gears, noise and vibration are small, and there is an advantage that reverse rotation can be prevented. On the other hand, severe wear and damage are displayed on the gear and worm tooth surface, and many defects such as intense heat generation of the reducer occur. In order to improve this, separate the worm wheel into two parts and maintain the workability and tooth form wearability, while the worm boss uses a light and strong material to improve cost and improve wear I tried. In the case of the reducer case, the 4 piece casing method was selected to solve the problems of heat generation, transmission efficiency and assemblability. In this paper, we analyzed the problems of worm and worm wheel, which are the core parts of 5Ton worm reducer, and casing by these methods, and researched to solve them.

복합기 및 프린터에 적용되는 에프세타 렌즈의 설계 및 제작에 관한 연구

박용우 경상국립대학교 대학원 2022 국내박사

고속 고해상도 레이저 프린터와 복합기의 요구가 최근에 급격하게 증가하고 있는 추세이다. 이는 사무자동화와 밀접하게 연관성으로 좀 더 빠르고, 높은 해상도를 지향하는 레이저 프린터와 복합기의 필요성이 사무환경에서 지속적으로 요구되고 있다. 또한, 레이저 프린터와 복합기 성능의 가장 중요한 요소인 레이저 스캐닝 유니트(laser scanning unit)가 핵심엔진이라 할 수 있다. 레이저 프린터와 복합기의 레이저 스캐닝 유니트 시스템은 컴퓨터의 디지털 신호가 레이저 스캐닝 유니트로 전달되어 디지털 데이터를 빛의 정보로 변환해주는 역할을 한다. Fig. 1은 레이저 스캐닝 유니트의 정보 전달 개념으로 컴퓨터 및 레이저 빔 프린터 컨트롤러를 통해 레이저 스캐닝 유니트로 전달된 정보는 레이저 프린터와 복합기에 인쇄가 되는 형태를 나타낸 것이다. 레이저 스캐닝 유니트의 가장 핵심 부품중 하나가 에프세타 렌즈로서 이에 대한 광학적 성능향상과 효율성 및 양산성을 높이기 위해 다수의 연구자에 의해 활발한 연구가 진행되고 있으며 본 연구에서는 420×297 mm 크기에 적합한 단(單) 렌즈형태의 에프세타 렌즈에 대한 설계 및 제작에 대한 연구 With the ever-improving requirements for printing resolution, printing speed and noise, laser printing and scanning unit based on the precision optical technology have been greatly developed in recent years. The f-theta lens is considered to be the most important element in the laser printing and scanning unit that affects the printing resolution, which can convert the computer digital data into a light signal and transmit the optical information to the laser printing and scanning system. It is a mainly composed of a light source, collimator lens, and polygon mirror. Many researches of obtaining the higher printing or scanning resolution by increasing the number of lenses have bee studied, but this method will inevitably increase the volume of the entire system. In this study, a solution to optimize the optical performance of the f-theta lens was proposed and verified by a series of optical numerical investigation on the laser printing and scanning unit. The satisfactory optical performance of the optimal f-theta lens is confirmed by experimental method. In addition, the modality of the f-theta lens was verified by injection molding simulation. This paper is to apply the cartesian robot gripper change and to confirm the problem or not, deals with information about the benefits of the gripper change before and after applying. Repeat the exercise measurement accuracy applies after the gripper change and examined the information on more than 100 million times durability tests, adverse conditions in the coolant inlet to avoid actual driving. Gripper change before and after the application was granted an artificial situation in order to determine the difference between the yield on the small quantity batch production. Conditions to see the benefits by applying the gripper change as this study should be a reprint small quantity batch production, limited space inside suitable for the production of various products to the intended users, and due to the replacement time reducing the economic costs and space in automated lines advantages, could make the three advantages of the reduction of the cost in time.

4MW급 풍력터빈용 요 드라이브 개발에 관한 연구

윤상문 경상국립대학교 융합과학기술대학원 2023 국내석사

In this paper, basic and theoretical research on the design process and manufacturing technology of the gearbox, which is an essential power transmission device, is performed through basic system understanding of the wind turbine, and the goal is to manufacture and verify the product. is writing about. The gearbox for driving the nacelle consists of a sun gear that transmits power from the drive motor and drives a planetary gear, a planetary gear that is affected by the reduction ratio of the gearbox, and a ring gear that has an internal gear and serves as a planetary gear assembly housing. The performance of a gearbox composed of multiple gear assembles depends on the design method of the gear, the processing precision of the gear, the type of heat treatment, and the lubrication method. Therefore, in this paper, we conduct a study to prove the surface heat treatment hardness, hardened layer depth, vibration and noise, temperature rise, and reducer efficiency, which are key factors of quality through testing of gearboxes for wind turbines.

Optimal Design of Two-Stage Planetary Gearbox for Special-purpose Industrial Machinery

진진 경상대학교 대학원 2019 국내석사

기어 박스는 다양한 분야에서 광범위하게 사용됨을 알고 있다. 수년 동안 기어 고장 및 기어 소음 방지에 대한 많은 연구가 이루어졌다. 최적의 디자인을 고안하는 것은 새로운 기어 박스를 개발할 때 가장 중요한 단계로 간주된다. 다른 용도에 따라 다양한 요구 사항이 필요한 것처럼 기어 박스 설계 최적화의 방향과 방법도 다양하다. 일반적으로 기어 지오메트리 최적화는 강도 및 전달 오차에 큰 영향을 미치며 이는 소음 및 진동에 영향을 미치는 인자이다. 본 논문의 목적은 유성 기어 박스의 지오메트리 최적화 방법을 연구하는 것이다. 본 연구에서는 기계 설계 및 해석에 사용되는 고급 CAE 소프트웨어인 RomaxDESIGNER를 사용하여 3D 모델링하고 다양한 해석을 수행했다. 매크로 지오메트리 최적 설계 방법과 마이크로 지오메트리 수정 방법은 특수 산업 기계용 2단 유성 기어박스를 기반으로 수행된다. 최적의 매크로 지오메트리 파라미터는 기어 트레인의 각 기어를 계산하여 검증하였으며, 마이크로 지오메트리 형상 수정의 영향은 하중 분포 및 전달 오차 분석에도 반영되었다. 동력 전달의 중요한 평가 지표인 기계적 전달 효율은 ISO 국제표준을 기반으로 계산되었다 Gearboxes find extensive use in a wide variety of fields. Over the years, a great deal of research has been devoted to prevention of gear failures and gear noise. Devising an optimal design is often considered as the most important stage in the development of a new gearbox. Similar to the varying requirements of different applications, the directions and method of gearbox design optimization are also varied. Usually, gear geometry optimization has a great influence on the strength and transmission error which is the excitation factor that affects the noise level. The main objective of this article is to study the geometry optimization methodologies of planetary gearbox. In this study, RomaxDESIGNER which is advanced CAE software used for the design and analysis of mechanical was used to generate 3D models and calculate various of analysis. Macro geometry optimal design method and micro geometry modification method are carried out based on a two-stage planetary gearbox for special-purpose industrial machinery. The optimal macro geometry parameter was verified by calculations of each gear in gear train, and the effect of micro geometry modification was also reflected in the analysis of load distribution and transmission error. As an important evaluation index of power transmission, the mechanical efficiency was calculated based on ISO standard.

8톤급 유압윈치 시스템 감속기의 기어 설계에 관한 연구

김형진 경상대학교 융합과학기술대학원 2019 국내석사

In this paper, the gears of hydraulic winch accelerators are designed to be applied to pipelines. Since it is not designed and manufactured in Korea and is dependent on imports, it was researched to obtain an alternative import effect. The conditions to be satisfied in the design were based on the performance of the imported products applied to the vehicle and the typical performance requirements were set as follows. First, rotate the moderator smoothly when it is driven forwards and backwards. Second, when applying external wire rope, the pulling force of the hydraulic winch shall be greater than 8 tons. Third, the efficiency of the machine shall be 85% or more when the hydraulic winch is operated. To satisfy the requirements of the design, five test winches were designed and manufactured using the deceleration rate of 1:22.485. The dimensions of the manufactured gears were assembled after measurement and tested for performance by producing a test device similar to the actual conditions applied with the hydraulic winch to verify compliance with the design conditions. The results of the test were satisfactory for all abnormalities, traction and mechanical efficiency of the intended operation. Hopefully, this will lead to an alternative import effect.