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Glass tube overflow down-draw forming device and its design method

A glass tube, overflow technology, applied in glass forming, glass forming, glass manufacturing equipment, etc., to achieve the effect of excellent surface quality, good surface characteristics, and small thickness deviation

Active Publication Date: 2021-08-10
CDGM OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a glass tube overflow down-draw forming device, aiming to solve the problem of how to make a glass tube with excellent surface quality and small thickness deviation

Method used

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  • Glass tube overflow down-draw forming device and its design method
  • Glass tube overflow down-draw forming device and its design method
  • Glass tube overflow down-draw forming device and its design method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] The size parameters and physical simulation experiment test parameters of an overflow glass tube overflow down-draw forming device are shown in Table 1. The viscosity of glass molding is simulated with high-viscosity silicone oil, and the experimental results are shown in 2. The glass tube overflow down-draw forming device is used to make a glass tube with a diameter of 6.0505 cm and a tube thickness of 0.1 cm; the shrinkage ratio of the tube diameter is D 3 / D 4 is 2.85.

[0115] Table 1: Adoption image 3 The design data of the structural form for simulation experiments

[0116]

[0117] Table 2: Adoption image 3 The liquid film thickness and thickness deviation test data of the simulation experiment

[0118] Numbering 1 2 3 4 5 6 7 8 Thickness (mm) 2.96 3.09 3.05 2.9 2.92 3.09 2.98 2.96 Relative deviation -1.13％ 3.22％ 1.88％ -3.13％ -2.46％ 3.22％ -0.46％ -1.13％

[0119] During the experiment, the outlet at the lowe...

Embodiment 2

[0125] The size parameters and physical simulation test parameters of an overflow down-draw forming device for an inner overflow glass tube are shown in Table 3. The viscosity of glass molding was simulated with high-viscosity silicone oil, and the experimental results are shown in Table 4. The glass tube overflow down-draw forming device is used to make a glass tube with a diameter of 4.2266 cm and a tube thickness of 0.1 cm; the shrinkage ratio of the tube diameter is D 3 / D 4 is 3.35.

[0126] Table 3: Adoption Figure 6 The design data of the structural form for simulation experiments

[0127]

[0128] Table 4: Adoption Figure 6 The liquid film thickness and thickness deviation test data of the simulation experiment

[0129] Numbering 1 2 3 4 5 6 7 8 Thickness (mm) 3.71 3.70 3.59 3.73 3.58 3.64 3.53 3.51 Relative deviation 2.47％ 2.03％ -0.88％ 2.83％ -1.09％ 0.37％ -2.59％ -3.15％

[0130] During the experiment, the outlet ...

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Abstract

The invention belongs to the technical field of glass tube manufacturing, and specifically discloses a glass tube overflow down-draw forming device and a design method thereof, aiming at solving the problem of how to manufacture a glass tube with excellent surface quality and small thickness deviation. Glass tube overflow down-draw forming apparatus, annular feed barrel, cylindrical core, and outer or inner overflow pan. By arranging a cylindrical core coaxial with it in the annular supply barrel, a glass liquid containing ring cavity is formed between the cylindrical core and the upper barrel, and a narrow cavity is formed between the cylindrical core and the lower barrel. slit channel, and then the molten glass flowing in from the molten glass feed port can flow from the molten glass holding ring cavity to the slit channel, so that the flow of molten glass flowing out from the outlet of the slit channel is evenly distributed, and at the same time, by setting the outer overflow plate or inner overflow The flow plate overflows the molten glass. During the overflow process, the molten glass can form good surface properties under the action of surface tension, thereby forming a glass tube with excellent surface quality and small thickness deviation.

Description

technical field [0001] The invention belongs to the technical field of glass tube manufacturing, and in particular relates to a glass tube overflow down-draw forming device and a design method thereof. Background technique [0002] With the continuous advancement of science and technology and increasing innovation, the demand for high-quality optical glass tubes is also increasing, such as: optical fiber leather tubes, etc. At present, the production of optical fiber leather tubes usually undergoes cold processing after secondary drawing to meet the requirements of uniform thickness and good straightness of the glass tube; The rate is low, and the processing cost of cold processing is very high. Therefore, how to improve product quality, material utilization rate and reduce production cost is a key problem in the production of high-quality optical glass tubes. Contents of the invention [0003] The invention provides an overflow down-draw forming device for a glass tube,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B17/04G06F30/20
CPCC03B17/04G06F30/20
Inventor 卢世峯王乃帅王培新粟勇
Owner CDGM OPTICAL GLASS
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