Methods for manufacturing performs for press molding and method for manufacturing optical elements
A preformed body and pressure forming technology, which is applied in the direction of manufacturing tools, glass pressing, glass manufacturing equipment, etc., can solve the problems of reducing devitrification resistance, not being able to preform, and reducing the viscosity of glass
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1～6
[0126] [embodiment 1~6, comparative example 1~4 ( figure 1 )]
[0127] Put the refractive index (nd): 1.8268, Abbe number (νd): 23.5, in the platinum crucible 2 o 5 , R 2 O(R: Li, Na, K), Nb 2 o 5 The glass flake as the main component is dissolved at 1000°C, then defoamed and clarified at 1100°C and stirred evenly to obtain molten glass. This molten glass is combined with the bottom of the crucible and passed through a temperature-controlled platinum tube, and at a flow rate of 0.55Kg / hr, it flows out of a nozzle (inner diameter: φ0.8mm) made of platinum alloy at 9000°C. ) flow out continuously. The liquidus temperature of this glass is 880°C, and the liquidus viscosity is 5.3dPa·s. Therefore, the outflow viscosity of the molten glass calculated from the liquidus temperature and the liquidus viscosity is 4.1 dPa·s.
[0128] use figure 1 The device shown, shapes the molten glass flowing out under this outflow condition into 146mm 3 (553mg) of spherical preforms. Firs...
Embodiment 7
[0135] Embodiment 7 ( figure 2 )
[0136] use figure 2 The shown apparatus produces a preform for press molding.
[0137] The molten glass of the same type was flowed out under the same conditions as in the above-mentioned Examples 1 to 6 only by changing the outlet diameter from 0.8 mm to 0.9 mm. By changing the diameter of the spout, the glass flow rate was increased to 0.72Kg / hr. Such as figure 2 As shown, directly below the outflow port, two sets of assembly components are arranged in the vertical direction. Make the first support close to the nozzle and support the front end of the molten glass flow ( figure 2 (a)), when the molten glass of a predetermined capacity is retained, the support body is suddenly lowered, thereby falling from the molten glass flow and cutting the molten glass block ( figure 2 (b)). Afterwards, the first support (assembly part) is separated for 70 to 100 msec, and the molten glass gob is dropped and inserted on the second support ( ...
Embodiment 8
[0141] Embodiment 8 ( image 3 )
[0142] Compared with embodiment 7, only the forming device is changed to image 3 device shown, and form a 146mm 3 (553mg) of spherical preforms. First, four sets of assembly parts (supports) are evenly arranged around the circumference of a table turned at 90° (hereinafter referred to as assembly table). Make the floating gas normally flow to each assembly part, and form a state that can float up and support the molten glass. In addition, only the split-die parts at the normal B-position can be independently raised and lowered by a split-die vertical mechanism (not shown) provided at the lower part of the split-die at the B position.
[0143] On the other hand, a rotatable rotary table (hereinafter referred to as a forming table) larger than the above-mentioned table was prepared, and 12 ball forming dies were equally arranged on the circumference of the table. In addition, one of the 12 molds is located at position A, and is installed ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| glass transition temperature | aaaaa | aaaaa |
| liquidus temperature | aaaaa | aaaaa |
| Abbe number | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More