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Article

Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis

by 1, 1 and 1,2,*
1
State Key Laboratory of Precision Measuring Technology & Instruments, Centre of Micro/Nano Manufacturing Technology–MNMT, Tianjin University, Tianjin 300072, China
2
Centre of Micro/Nano Manufacturing Technology–MNMT-Dublin, University College Dublin, 4 D04 V1W8 Dublin, Ireland
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(12), 1069; https://doi.org/10.3390/mi11121069
Received: 1 November 2020 / Revised: 25 November 2020 / Accepted: 28 November 2020 / Published: 30 November 2020
Precision glass molding is the most appropriate method for batch production of glass lenses with high surface accuracy and qualified optical performance. However, the form error caused by material expansion and contraction is the main factor affecting the precision of the molded lenses, thus the mold must be pre-compensated. In this paper, an effective method of mold pre-compensation based on mathematical analysis is established. Based on the thermal expansion curve of D-ZK3 glass, the freezing fictive temperature of the glass under the actual cooling rate is measured, and the mold pre-compensation factor can be quickly calculated. Experimental results show that the peak valley (PV) value of the surface form error of molded aspheric lens with an aperture of 5.3 mm is effectively reduced from 2.04 μm to 0.31 μm after the pre-compensation, thus meeting the geometric evaluation criterion. View Full-Text
Keywords: precision glass molding; mold pre-compensation; mathematical analysis; cooling rate; surface form error precision glass molding; mold pre-compensation; mathematical analysis; cooling rate; surface form error
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MDPI and ACS Style

Zhang, Y.; You, K.; Fang, F. Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis. Micromachines 2020, 11, 1069. https://doi.org/10.3390/mi11121069

AMA Style

Zhang Y, You K, Fang F. Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis. Micromachines. 2020; 11(12):1069. https://doi.org/10.3390/mi11121069

Chicago/Turabian Style

Zhang, Yue, Kaiyuan You, and Fengzhou Fang. 2020. "Pre-Compensation of Mold in Precision Glass Molding Based on Mathematical Analysis" Micromachines 11, no. 12: 1069. https://doi.org/10.3390/mi11121069

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