Glass bending is an important process in glass device manufacturing, and real-time stress detection is essential for regulating bending mold pressure. A three-point bending experiment is used to simulate the glass cold bending forming process, and the feasibility of the photoelastic method to detect the real-time bending stress in the pure cold bending state is analyzed. The conventional division-of-amplitude polarimeter is optimized to obtain a smaller spot diameter, fewer system conditions, and a wider stress detection range. The Stokes parameter error of the optimized system is 0.05, and the optical path difference measurement accuracy is 4.284 nm. The test quality of the photoelastic stress detection system during the three-point bending was not affected by the glass size or bending span. However, the various curvatures of the incident surface were found to cause different stress values in unloaded glass and fluctuations in y-values (the distance from the test beam to the neutral surface of the glass) to occur outside the normal range. The less the curvature of the glass is, the closer it is to normal incidence, and the more accurate the stress value is. After the heat treatment of the borosilicate glass, the experimental results show that the isotropic structure of the glass does not change significantly. The exploration of testing quality of bending stress provides an effective reference for practical high-precision bending glass manufacturing.
In order to investigate the tribological performance of laser clad coatings on die steel, laser cladding techniques were
adopted with Fe-based alloy powders. The wear tests were carried out by using laser clad layers as low samples and
GCr15 steel ball as upper samples with HT-500 wear tester. The morphologies of wear scars were observed with optical
microscopy, and the wear width and the depth of the wear samples were measured. In the meantime, the wear rate was
calculated theoretically. Under dry sliding condition, As the tests show, friction coefficient decreased with the load
increase gradually, then increased. And the wear performance of 300g load was better than that of 500g load under dry
sliding condition. Under lubricant condition, with the increase of load, the friction coefficient decreased gradually. And
the friction coefficient, wear rate and wear width under lubricant are smaller than that under dry friction with the same
load.
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