Large-scale production method for precision extruding precast product, precast product forming device and optical element production technique
A prefabricated, large-scale technology, applied in the direction of glass production, manufacturing tools, glass molding, etc., can solve problems such as inability to produce
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example 1
[0115] Fig. 1 is a schematic partial view of an example of the preform forming device of the present invention, wherein (a) shows a top view, and (b) shows a side view. Twelve forming dies 2 are arranged at equal intervals around the rotation axis of the turntable 1 on the turntable 1 . By rotating the turntable 1 stepwise by an unillustrated rotating unit, these forming dies 2 are transported one by one to 12 stop point positions during repeated moving and stopping processes.
[0116] Above one of the 12 stop positions, a pipeline 3 for letting molten glass flow out is arranged, and a vessel (not shown) containing molten glass is arranged at the upper end of the pipeline. In this vessel, the purified and homogenized glass is heated and collected. The molten glass in the molten glass vessel continuously flows out through the pipe 3 at a constant rate. The forming mold 2 at the stop point of the supply position is moved upward to receive the lower end of the molten glass flow...
example 2
[0135] Fig. 5 is a partial schematic view of another form of the preform forming device of the present invention, wherein (a) shows a plan view, and (b) shows a side view.
[0136] For each forming die, preforms placed in trays in the same manner as in Example 1 were sampled, and the mass was measured. In Example 2, it was determined that the quality standard was 500 mg ± 5 mg, and it was found that the preform formed with forming die No. 3 had a quality above the standard range, while the preform formed with forming die No. 10 had a quality below the standard range the quality of. Therefore, the molding device was set as follows. Forming mold 3 stops directly below the pipeline, and when it is moved upwards with forming mold elevating mechanism 6 to make it close to the glass outlet of pipeline, it is positioned at a position lower than the position of its previous round of 5 / 100mm. Similarly, forming die No. 10 is located 5 / 100mm higher than the position of its previous ro...
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