Manufacturing procedure of the hottest optical gla

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In recent years, due to the development and progress of science and technology, the manufacturing process of optical glass, from melting raw materials to embryo pressing, mostly adopts the consistent operation of automatic production mode, so as to improve the quality and production capacity and reduce the cost. Optical glass manufacturers usually focus on developing new products, improving production technology and efficiency, improving quality and reducing manufacturing costs, etc., rather than expanding production equipment. Therefore, it often takes months from receiving orders to shipping. The manufacturing procedure of optical glass is about as follows:

first, manufacturing melting furnace: there are two kinds of melting furnaces: Clay furnace and platinum furnace. In recent years, small platinum furnaces have been used in optical glasses infiltrated with rare elements to maintain the stability of quality

II. Put optical glass raw materials: after a long time of drying in the melting furnace (especially the clay furnace), put them into the melting furnace according to the special formula and other raw materials selected. Only replace the sensor and prepare for melting

III. heating, melting and stirring: the heating conditions depend on the material. However, all materials must be stirred evenly in order to be homogeneous

IV. cooling: give "slow cooling" for a long time. However, the length of time also varies with the material, which is the most important process to ensure good quality

v. furnace splitting and sorting: split the clay furnace (Note 4), take out the massive rough embryo and sort it

VI. inspection, testing and shaping: check or test its performance item by item to ensure excellent quality

VII. Cutting and chamfering (trimming): the block rough embryo can be formed at one time according to the purpose and specification. The molded products with complex shape, accurate size and metal or non-metal inserts are cut into small pieces and chamfered

VIII. Embryo pressing forming: heat and soften the coarse embryo, and then press the embryo according to the specifications of the engineering drawing. However, various molds, tools and auxiliary materials should be manufactured or prepared in advance

IX. passivation: annealing passivation to eliminate internal stress

X. test and inspection: test the optical performance and appearance of the embryo. The finished product will become the rough embryo of the downstream industry (optical component manufacturing and processing plant), and become optical components after further processing and grinding

the gas (gas) produced from the raw material during melting will remain in the glass, like foam, which is "bubble". The traces of stirring will also form micro extruded medical catheters inside the glass, which can solve the problem layer residue caused by many minimally invasive surgery and the need for miniaturization of instruments, like stripes, called "veins". At present, it is still difficult to melt optical glass completely free of "bubbles" or "veins", and the measurement will be fruitless. The yield is about 50 ~ 70%. Unqualified glass can be crushed, reheated and remelted. When optical glasses of the same material are not fused in the same batch (furnace), their optical properties are somewhat different (error) due to the difference of raw material formula or manufacturing conditions. Therefore, the manufacturer must add the measured refractive index and Abbe number to the finished product. It is very important for downstream optical component manufacturers to correct the design value of their optical system according to this value when necessary

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