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TECHNICAL BRIEFS

Analysis of Shadow Mask Tension Subjected to Thermal and Mechanical Loads

[+] Author and Article Information
Y. H. Moon

Engineering Research Center for Net Shape and Die Manufacturing/Department of Mechanical Engineering, Pusan National University, Pusan 609-735, Koreayhmoon@pusan.ac.kr

D. I. Hyun

Engineering Research Center for Net Shape and Die Manufacturing/Department of Mechanical Engineering, Pusan National University, Pusan 609-735, Korea

C. J. Van Tyne

Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401

J. Eng. Mater. Technol 128(2), 243-247 (Jun 15, 2005) (5 pages) doi:10.1115/1.2172627 History: Received September 27, 2003; Revised June 15, 2005

In cathode ray tubes, a tension is imposed into the shadow mask during manufacturing to avoid slight variations in the position due to in service temperatures or deformation. Initially, tension is imparted to the shadow mask after it is welded to the compressed mask frame and the frame is allowed to retract. Subsequently, during further processing of the cathode ray tube, the tensioned shadow mask is subjected to heating. The heating causes some of the tension to decrease due to stress relaxation phenomenon associated with heating and creep. In the present study, the tension variation during manufacturing has been analyzed and the appropriate material characteristics and processing conditions to assure a more stable shadow mask for final service are suggested.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic drawing of seam welding process between shadow mask and the compressed frame

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Figure 2

Schematic drawing indicating temperature measurement positions

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Figure 3

Schematic drawing of specimen used for creep testing

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Figure 4

Experimentally measured temperature profiles

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Figure 5

Elastic modulus for various materials as a function of temperature

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Figure 6

Coefficients of thermal expansion for frame and mask materials

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Figure 7

Variation of (a) strain and (b) stress (i.e., tension) in the mask during the heat cycle

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Figure 8

Creep curve for mask material at 450°C with initial tensile stress of 300MPa

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Figure 9

Variation of (a) strain and (b) stress (i.e., tension) in the mask during the heat cycle with consideration of creep deformation

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Figure 10

Critical cooling curve for mask to avoid yield

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Figure 12

Critical cooling curve for the frame to avoid yield in the mask

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Figure 13

Variation of stress (i.e., tension) during the heat cycle with faster cooling rate in the frame

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Figure 11

Variation of stress (i.e., tension) during the heat cycle with slower cooling rate in the mask

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