• Title/Summary/Keyword: High speed rotating chuck

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Design and Operation Possibility of the Automatic Dynamic Balancer for the High Speed Rotating Chuck at the Friction Welding (마찰 용접용 고속 회전척의 ADB설계 및 작동성 연구)

  • Lee, Jong-Kil
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.6
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    • pp.148-158
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    • 2001
  • In this paper, Automatic Dynamic Balancer(ADB) was simulated and investigated to use at the high speed rotating chuck for the friction welding. In the limited computer simulations and experiments that have been presently carried out, several conclusions have been found. Above critical speed of the rotating system, ADB can balance the rotating disk. Therefore, it can be predicted that ADB can make an uniform flash during the friction welding.

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Dynamic Characteristic Evaluation of Spin Coater Module for GaAs Wafer Bonding (화합물 반도체 본딩용 Spin Coater Module의 동특성 평가)

  • Song Jun Yeob;Kim Ok Koo;Kang Jae Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.6 s.171
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    • pp.144-151
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    • 2005
  • Spin coater is regarded as a major module rotating at high speed to be used build up polymer resin thin film layer fur bonding process of GaAs wafer. This module is consisted of spin unit for spreading uniformly, align device, resin spreading nozzle and et. al. Specially, spin unit which is a component of module can cause to vibrate and finally affect to the uniformity of polymer resin film layer. For the stability prediction of rotation velocity and uniformity of polymer resin film layer, it is very important to understand the dynamic characteristics of assembled spin coater module and the dynamic response mode resulted from rotation behavior of spin chuck. In this paper, stress concentration mode and the deformed shape of spin chuck generated due to angular acceleration process are presented using analytical method for evaluation of structural safety according to the revolution speed variation of spin unit. And also, deformation form of GaAs wafer due to dynamic behavior of spin chuck is presented fur the comparison of former simulated results.

The behavior of strength on friction welding of dissimilar steels by various heating time : in case of SM45C and SUS304 materials (이종강의 마찰압접시 압접시간 변화에 따른 강도거동-SM45C와 SUS304재의 경우)

  • 박명과;박명과
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.11 no.5
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    • pp.762-771
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    • 1987
  • Friction welding is a fusion process in which the necessary heat is generated by clamping one of the two pieces to be welded in a stationary chuck and rotating the other at high speed with an axially applied load. It is essentially a variation of the pressure welding process but utilizes a novel heating method. In addition to the foregoing advantages, it has also been reported excellent for welding dissimilar materials. Therefore, this study reported on investigating the strength behavior for the frictionally welded domestic structural steel SM45C and SUS304. The results obtained by the experiments are as follows. (1) The highest tensile strength of the best friction welded specimen (B4) is about 3% lower than that of SM-45C base metal, and 9% lower than that of SUS304 base metal. The heat treated specimens (850.deg.C 1hr A.C) have almost same value of tensile strength. (2) The strain of SM45C base metal is 27.3% and that of SUS304 is 42%, that of the best friction welded specimen (B4) appeared as 11.9% which is about 50% lower than the base metal, so, this same phenomenon apeared in all the other welding conditions. (3) The bending strength of SM45C base metal is 123kgf/mm$^{2}$ and that of SUS304 is 127kgf/mm$^{2}$. The best specimen (B4) appeared as 121kgf/mm$^{2}$ which is almost same bending strength for both base metals. (4) The friction welded condition involving maximum strength is determined by P$_{1}$=8kgf/mm$_{2}$, P$_{2}$=22kgf/mm$_{2}$, T$_{1}$=10sec, T$_{2}$=2sec, and amount of upset 7.6mm. (5) The interface of two dissimilar materials are mixed strongly, and welded zone is about 1.03mm and also the heat affected zone is about 2.36mm at SM45C while about 1.85mm at SUS304, therefore the welded zone and heat affected zone are very narrow to compare with those of the other welding materials.