CN103058502B - A kind of making method of glass material filtration - Google Patents

Abstract

The invention relates to a manufacturing method of a filter structure made of glass material, which belongs to the field of laser processing. Steps of the present invention: use 3D modeling software to establish a filter network structure model in a computer; extract nodes in the network structure to create a point cloud model, and now the distance between two points in the vertical direction should be 1.8 to 2.1 times the distance in the horizontal direction; point The height of the cloud model needs to be greater than the thickness of the glass by 2mm~4mm; the density of the point cloud changes within the range of 130~160 points/mm ² ; use the laser to cooperate with the processing platform and the galvanometer system to form points inside the glass material according to the generated point cloud model Cracks, microchannels will be formed between points due to stress, so that the points are connected to form a microstructure with filtering function; the power of the green laser varies between 300mw~750mw, and the power of the ultraviolet laser varies between 400mw~900mw change between. The invention is applicable to the preparation of filter screen microstructures of various glass materials, can produce filter screen microstructures of various shapes, uses low laser power, and has low price for glass as a filter screen preparation material. <!--1-->

Description

A method for manufacturing a filter structure made of glass material

technical field

The present invention relates to a method for producing filtering microstructures inside a glass substrate.

Background technique

In daily life and industrial production, many places need to be applied to filter microstructures, filter dust, foam and other substances, and glass is also widely used in industrial production and daily life. The two are fused, and the laser is used to texture the intricate microstructure inside the glass and make it transparent on the upper and lower surfaces of the glass. Water molecules can pass through this microstructure, but foam and impurity particles cannot pass through, completing the filtration. At present, most of the devices used for filtering are made of other materials, and the use of glass to make the filter structure has the advantages of simple preparation, low price, and good filtering effect. At the same time, the macroscopic shape and area of the filter structure made of glass are controllable.

Contents of the invention

In view of the above, it is necessary to propose a simple and highly reliable fabrication method for filtering microstructures, which are used to filter impurity particles, foam, etc. in liquids.

The present invention can manufacture a glass filter device with a thickness of 0.7 mm to 8 mm. As the thickness increases, the internal filter channels of the glass increase, so the filter effect is improved. The material used to make the filter can be ordinary soda-lime glass, ultra-clear glass, electronic glass or even liquid crystal substrate glass.

In the present invention, the device used to make the glass filter structure includes a computer, a laser, a data line connecting the computer and the laser, a laser motion control system, a workbench and other motion control systems, and the materials are various glasses mentioned above.

A method for manufacturing a glass filter structure, characterized in that it comprises the following steps:

(1) Use 3D modeling software to establish a filter network structure model in the computer;

(2) Extract the nodes in the network structure to create a point cloud model. At this time, the distance between two points in the vertical direction should be 1.8~2.1 times the distance in the horizontal direction; the height of the point cloud model must be greater than the thickness of the glass by 2mm~4mm; the point cloud density is Change within the range of 130~160 (points/mm2);

(3) Use the laser to cooperate with the processing platform and the galvanometer system to carve points inside the glass material to form cracks according to the generated point cloud model. Microchannels will be formed between points due to stress, so that the points are connected and formed Microstructure with filtering function; the power of green laser varies from 300mw to 750mw, and the power of ultraviolet laser varies from 400mw to 900mw; the diameter of the filter channel corresponding to low energy is smaller.

Described 3D modeling software can be: 3DMAX, Pro/E, solidworks, AUTOCAD etc.

The point cloud model is a dot array, and the laser emits light at the dot positions for processing according to the dot matrix model.

The point cloud density refers to adjusting the distance between points. In the case of a certain laser power, if the distance between points is too large, there will be no channel connection between the two points, so that they cannot be connected and cannot play a filtering role. , if the distance is too small, the diameter of the channel between two points will be too large, resulting in poor filtering effect. As the density and light transmittance of the glass material increase, the point cloud density and power also increase. Because the cracks generated when the laser spot acts on the inside of the glass are not completely symmetrical, the size in the vertical direction is larger than the size in the horizontal direction, so the cracks are easier to expand in the vertical direction. In order to ensure a uniform structure of the filter screen, usually the vertical point and The distance between points is 1.8~2.1 times of the horizontal distance.

The micron-scale channel refers to the gap between two laser-engraved points inside the glass. When the glass material is cooled, cracks will be generated under the action of tensile stress. The diameter of the cracks can be controlled by laser power and point cloud density.

The laser is a green laser or an ultraviolet laser. The power of the green laser is adjustable, and the average power is 300mw~750mw. The average power of the ultraviolet laser is 400mw~900mw.

The processing platform refers to a platform that can move precisely in the vertical direction, and is used to position the material to be processed in the vertical direction. A galvanometer system is used to position the laser beam in a two-dimensional plane.

The point cloud processing refers to, according to the point cloud model generated and adjusted in the steps (2) and (3), the laser is focused on the position where the point needs to be marked, and the energy density of the focused point will be greater than the breakage of the glass Threshold, a tiny crack will be generated at the focus point, and the energy density is low at the position outside the focus point, which will not cause damage to the glass.

The working principle of the present invention is: according to the type of glass material and the diameter of the desired filter channel, adjust the distance and power between points: for ordinary soda-lime glass, the optimal point cloud density is 130~140 (points/mm ² ) , the best laser power is 720~755mw. At this time, the diameter of the laser marking point is 20 μm, and the diameter of the channel between the points is about 5 μm; for ultra-clear glass, its density and hardness are higher than ordinary glass, the best point cloud density 140~155 (points/mm ² ), the optimal laser power is about 770mw, at this time, the diameter of the laser marking point is 20μm, and the channel diameter is about 5μm. If you want to get a smaller channel to improve the filtering accuracy, you can increase the point cloud density and reduce the laser power. In order to simplify the positioning process, when establishing a point cloud model, the height of the model should be 2~4mm greater than the thickness of the glass substrate to ensure that the filter structure is transparent on the upper and lower surfaces of the glass. Control the galvanometer, platform and laser, and engrave dots inside the glass according to the preset path. After the dots are completed, the material will cool naturally, and micro-channels will be formed between the dots. These channels allow liquids to pass through, and will filter out particles with a size larger than the diameter. Impurity particles. For other types of glass materials, point cloud density and laser power are determined according to their density, elastic modulus, and requirements for filter structure performance.

The present invention can directly prepare microstructures with filtering function in the glass substrate, and the shape of the filtering area of the filtering device can be artificially designed, such as circle, triangle, quadrangle and the like.

The features of the present invention are:

1. The preparation of the filter structure by laser belongs to non-contact processing. High precision and fast speed.

2. The filter device is made of glass, which has little pollution and low cost.

3. What the present invention uses is semiconductor-pumped green laser or ultraviolet pulse laser.

4. The filter channel is naturally produced by stress, flat and smooth.

5. The shape control of the filtering area is simple. Can be a triangle, circle, quadrilateral, or closed curve.

Description of drawings

Fig. 1 is the structural representation of the glass filter structure manufacturing system used in the present invention

In the figure: 1, galvanometer scanning system, 2, laser beam, 3, filter structure, 4, filter structure glass substrate, 5, processing platform, 6, laser, 7, computer.

Fig. 2 Filter structure point cloud model diagram, a, schematic diagram of 3D point cloud model, b, top view of 3D point cloud model, c, side view of 3D point cloud model.

Figure 3 is a physical picture of an ordinary glass circular filter structure with a thickness of 5 mm, and the diameter of the filter channel is about 5 μm.

Figure 4 is a physical picture of an ultra-clear glass square filter structure with a thickness of 5 mm, and the diameter of the filter channel is about 5 μm.

Detailed ways

First of all, it must be pointed out that this embodiment is only used to further illustrate the present invention, and should not be construed as limiting the protection scope of the present invention.

Example 1

The present invention selects 532nm semiconductor-pumped green light laser with small volume and convenient processing, and the laser motion control system adopts a scanning vibrating mirror; selects ordinary glass with a thickness of 1.1mm as material; selects a circle as the shape of the filtering structure. The diameter of the filter channel is 10 μm, and this example belongs to the preparation of an ordinary glass circular filter structure.

This example is carried out as follows: clean the glass and place it on the processing platform; use 3Dmax to make a model with a height of 4mm and save it in OBJ format; import the file into professional software to generate a point cloud model; adjust the point cloud density to 130 (point/mm ² ), save the point cloud model in dxf format, see Figure 2 for the model diagram; import the point cloud model dxf file into the laser galvanometer control software; set the laser power to 745mw, laser repetition frequency to 1.81kHz, single pulse Spotting; turn on the laser, so that the laser starts scanning according to the preset processing parameters; after scanning, take out the glass and blow the surface clean with auxiliary gas. The physical picture is shown in Figure 3.

In addition, for the above ordinary soda lime glass with a thickness of 1.1mm, if the point cloud density is changed to 140 points/mm ² , the laser power is changed to 725mw, and other parameters remain unchanged, the filter structure with a channel diameter of 5 μm can be fabricated.

Claims (1)

1. A method for making a filter structure of glass material, characterized in that, comprising the steps: (1) Use 3D modeling software to establish a filter network structure model in the computer; (2) Extract the nodes in the network structure to create a point cloud model. At this time, the distance between two points in the vertical direction should be 1.8~2.1 times the distance in the horizontal direction; the height of the point cloud model must be greater than the thickness of the glass by 2mm~4mm; the point cloud density is Change within the range of 130~160 points/ ^mm2 ; (3) Use the laser to cooperate with the processing platform and the galvanometer system to carve points inside the glass material to form cracks according to the generated point cloud model. Microchannels will be formed between points due to stress, so that the points are connected and formed Microstructure with filtering function; the power of green laser varies from 300mw to 750mw, and the power of ultraviolet laser varies from 400mw to 900mw.