An Electromagnetic Assisted Precision Hot Press Forming Method for Small-Aperture Optical Glass Components
A hot-press forming and optical glass technology, applied in glass forming, glass pressing, glass manufacturing equipment, etc., can solve problems such as uneven distribution of residual stress, trapped air heat transfer efficiency, and insufficient filling, and reduce stickiness. The effect of attaching phenomenon, improving optical properties, and refining glass grains
Inactive Publication Date: 2021-10-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0003] Aiming at the technical problems of insufficient filling, uneven distribution of residual stress, difficulty in demoulding, air trapping and low heat transfer efficiency in the above-mentioned prior art, the present invention aims to provide an electromagnetic-assisted precision thermal Compression method
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[0023] See attached Figure 1~5 , the material of the glass preform 19 to be pressed is chalcogenide glass IRG205, the shape is spherical, and the diameter is 4.16 mm; the pressed forming element 33 is an axisymmetric double aspherical lens, including an upper concave surface and a lower convex surface, and the lens is crescent-shaped , with a diameter of 6 mm, the effective diameters of the upper and lower sides are 1.8 mm and 3.5 mm respectively, and the center thickness of the lens is 1.86 mm; the forming mold is made of AF312 superhard alloy material; Finished in the compression molding device, and follow the following procedures:
[0024] Operation 1: Place the glass preform 19 in the mold cavity between the upper mold base 18 and the lower mold base 20, and fill nitrogen gas from the inlet / exhaust port one 14 and the inlet / exhaust port two 17; start the The electromagnetic induction heating system 4, the electromagnetic induction heating coil 16 generates an electric edd...
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Abstract
The invention discloses an electromagnetic-assisted precision hot-press forming method for a small-diameter optical glass element. The method is based on an electromagnetic-assisted precision hot-press forming device, and follows certain procedures to complete the precision hot-press forming of the small-diameter optical glass element; The method can realize the electromagnetic induction heating of the upper and lower mold bases and the glass preform in the hot pressing forming process by setting the electromagnetic induction heating system and the vibration system, as well as the electromagnetic induction vibration assistance of pressurization and mold closing; Compared with this method, the method improves the flow rate of the glass through electromagnetic induction vibration, suppresses the concentration of residual stress distribution, improves the lamination and mold filling performance of the glass, and reduces the adhesion and air trapping of the glass, thereby improving the molding of the pressed components. Accuracy and quality; and through electromagnetic induction heating, the heat conduction efficiency is effectively improved, and the phenomenon of uneven heating of the preform is improved.
Description
technical field [0001] The invention belongs to the technical field of precision hot-press forming, and in particular relates to an electromagnetic-assisted precision hot-press forming method for a small-diameter optical glass element. Background technique [0002] In recent years, various small-caliber optical glass components have been widely used in transportation vehicles, military weapons, medical equipment, and consumer electronics products; The glass preform is placed in a high-precision mold in a protective gas environment, and the preform is pressurized and deformed at the molding temperature, and then annealed and cooled to finally obtain a molded component; compared with the traditional mechanical polishing method, this The technology has the advantages of fewer processes, low cost, controllable parameters, and environmental friendliness; however, the following technical problems exist when pressing small-diameter optical glass components using precision thermofor...
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IPC IPC(8): C03B11/00C03B11/12C03B11/16
CPCC03B11/005C03B11/122C03B11/16
Inventor 唐昆李典雨舒勇易香怀张明军毛聪
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY