阅读说明：本技术 一种曲面玻璃及其制备方法 (Curved glass and preparation method thereof ) 是由 李波 于 2020-08-04 设计创作，主要内容包括：本发明属于玻璃加工技术领域,尤其为一种曲面玻璃及其制备方法,制备所述曲面玻璃的原材料包括石英砂、纯碱、方解石、长石、碳粉,活性剂；其中活性剂主要由8～11％SiO2、12～19％活性氧化剂、0.1～3％Al2O3、12～16％Na2O、20～28％CaO、30～40％挥发量、0.01～1％Fe2O3。本发明中的热弯模具在热弯玻璃时,可以减少绝大部分叠痕的发生,非曲面部分平整度好,而本发明通过自上而下的折弯,对于玻璃各个面都不会产生挤压变型导致厚薄不均的现象,折弯的影响仅限于侧边的软化玻璃,整体参与的软化玻璃量少,容易控制,并且受气体影响小,软化玻璃在重力作用下也能够起到曲面成型作用,成型的精度高。(The invention belongs to the technical field of glass processing, in particular to curved glass and a preparation method thereof, wherein raw materials for preparing the curved glass comprise quartz sand, calcined soda, calcite, feldspar, carbon powder and an activator; wherein the activator mainly comprises 8-11% of SiO2, 12-19% of active oxidant, 0.1-3% of Al2O3, 12-16% of Na2O, 20-28% of CaO, 30-40% of volatile matter and 0.01-1% of Fe2O 3. The hot bending die can reduce most of overlapping marks when the glass is hot bent, the flatness of the non-curved surface part is good, the hot bending die can not generate the phenomenon of uneven thickness caused by extrusion deformation on each surface of the glass by bending from top to bottom, the bending influence is only limited to the softened glass on the side edge, the quantity of the softened glass participating in the whole process is small, the control is easy, the influence of gas is small, the softened glass can also play a role in curved surface forming under the action of gravity, and the forming precision is high.)

1. The curved glass is characterized in that raw materials for preparing the curved glass comprise quartz sand, soda ash, calcite, feldspar, carbon powder and an active agent; wherein the activator mainly comprises 8-11% of SiO2, 12-19% of active oxidant, 0.1-3% of Al2O3, 12-16% of Na2O, 20-28% of CaO, 30-40% of volatile matter and 0.01-1% of Fe2O 3.

2. The utility model provides a hot-bending die for preparing curved glass in claim 1, including protruding orientation module (1), spacing module (2) and concave orientation module (3), characterized in that, protruding orientation module (1) includes clamp plate (101), one side fixed mounting that clamp plate (101) is close to spacing module (2) has terrace die (103), spacing module (2) include limiting plate (201), rectangular hole (202) have been seted up on limiting plate (201), the length width of terrace die (103) equals with the length width of rectangular hole (202), concave orientation module (3) include bottom plate (301), concave die groove (302) have been seted up to one side that is close to spacing module (2) of bottom plate (301).

3. The hot bending die according to claim 2, wherein the convex positioning module (1) comprises a pressing plate (101), four first positioning blocks (102) which are arranged in a rectangular shape are fixedly mounted at the bottom of the pressing plate (101), two first positioning grooves (204) with the tops and the bottoms being open are respectively formed in two sides of each limiting plate (201), and the four first positioning blocks (102) are respectively matched with the corresponding first positioning grooves (204).

4. The hot bending die according to claim 2, wherein two second positioning blocks (104) are fixedly mounted on two sides of the male die (103), second positioning grooves (206) with openings at the top and the bottom are respectively formed in inner walls of two sides of the rectangular hole (202), and the two second positioning blocks (104) are respectively matched with the corresponding second positioning grooves (206).

5. The hot bending die according to claim 2, wherein the limiting plate (201) is provided with four guide holes (203) arranged in a rectangular shape, one side of the bottom plate (301) close to the limiting module (2) is fixedly provided with four guide rods (303) arranged in a rectangular shape, and the four guide rods (303) are respectively matched with the corresponding guide holes (203).

6. The hot bending die according to claim 2, wherein four third positioning blocks (205) arranged in a rectangular shape are fixedly mounted on one side of the limiting plate (201) close to the concave positioning module (3), three positioning grooves (304) with openings at the tops are formed in four corners of one side of the bottom plate (301) close to the limiting module (2), and the four third positioning blocks (205) are respectively matched with the corresponding third positioning grooves (304).

7. The hot bending die according to claim 2, wherein the convex positioning module (1), the limiting module (2) and the concave positioning module (3) are all made of high temperature resistant graphite materials, and the first positioning block (102), the second positioning block (104), the third positioning block (205) and the guide rod (303) are all made of high temperature resistant ceramics.

8. A method for preparing curved glass, which adopts the curved glass produced by the hot bending die of claims 2-7, and is characterized in that the method for producing the curved glass comprises the following steps:

putting a glass blank into a hot bending mould prepared according to the method in the claim 2, putting the hot bending mould and the glass blank into a forming furnace together, heating until the glass is softened, keeping the temperature for 35-45min, vacuumizing the hot bending mould, forming vacuum in the hot bending mould, adsorbing the softened glass blank on a forming surface in the hot bending mould for forming to form a glass shell, and controlling the adsorption time for 3-5 min;

taking out the hot bending mould from the forming furnace, gradually cooling the hot bending mould and the glass shell in the hot bending mould until the temperature is cooled to room temperature, taking out the glass shell to obtain a curved surface glass semi-finished product, wherein the surface of the curved surface glass semi-finished product is rough;

edging the curved glass of the semi-finished product, specifically, edging the curved glass by using a CNC edging machine;

and fourthly, after the step of edging the curved glass, putting the curved glass in polishing solution for polishing.

Technical Field

The invention relates to the technical field of glass processing, in particular to curved glass and a preparation method thereof.

Background

3C products such as smart phones, smart watches, tablet computers, wearable smart products, instrument panels and the like are 3D products in succession, the development direction of 3D curved glass is guided, for example, the 3D curved glass is changed from a flat touch screen mobile phone to a 3D curved mobile phone screen, and the eyeground of people is greatly expanded. At present, people generally adopt a cold working technology to manufacture 3D curved glass for touch screens, and the basic process flow of the cold working technology is as follows: plate glass-shape material removal grinding, rough grinding, fine grinding, surface polishing, outer diameter processing and shaping, and 3D curved surface glass.

However, when the glass is hot-bent by using a traditional hot-bending die, the formed glass cannot be completely formed according to the shape of the die, particularly, the forming angle of the lower die is small, the problem of flatness of the plane of the glass, the problem of uneven height of the hot-bent side edge and even the problem of stacking can occur, and in addition, the arc surface of the formed glass can generate heavy indentation.

Therefore, we propose a curved glass and a method for preparing the same to solve the above problems.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides curved glass and a preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme: the curved glass is prepared from quartz sand, soda ash, calcite, feldspar, carbon powder and an active agent; wherein the activator mainly comprises 8-11% of SiO2, 12-19% of active oxidant, 0.1-3% of Al2O3, 12-16% of Na2O, 20-28% of CaO, 30-40% of volatile matter and 0.01-1% of Fe2O 3.

A hot bending die is used for preparing the curved glass in claim 1 and comprises a convex positioning module, a limiting module and a concave positioning module, wherein the convex positioning module comprises a pressing plate, a convex die is fixedly mounted on one side of the pressing plate, which is close to the limiting module, the limiting module comprises a limiting plate, a rectangular hole is formed in the limiting plate, the length and the width of the convex die are equal to those of the rectangular hole, the concave positioning module comprises a bottom plate, and a concave die groove is formed in one side of the bottom plate, which is close to the limiting module;

preferably, protruding orientation module includes the clamp plate, the bottom fixed mounting of clamp plate has four first locating pieces that are the rectangle and arrange, two tops and bottom are the open-ended first constant head tank all seted up to the both sides of limiting plate, four first locating pieces respectively with the first constant head tank looks adaptation that corresponds.

Preferably, two second positioning blocks are fixedly mounted on two sides of the male die, second positioning grooves with the tops and the bottoms being open are formed in the inner walls of the two sides of the rectangular hole, and the two second positioning blocks are matched with the corresponding second positioning grooves respectively.

Preferably, four guide holes which are arranged in a rectangular shape are formed in the limiting plate, four guide rods which are arranged in a rectangular shape are fixedly mounted on one side, close to the limiting module, of the bottom plate, and the four guide rods are respectively matched with the corresponding guide holes.

Preferably, one side of the limiting plate close to the concave positioning module is fixedly provided with four third positioning blocks which are arranged in a rectangular shape, four corners of one side of the bottom plate close to the limiting module are provided with third positioning grooves with the tops being open, and the four third positioning blocks are respectively matched with the corresponding third positioning grooves.

Preferably, the convex positioning module, the limiting module and the concave positioning module are made of high-temperature-resistant graphite materials, and the first positioning block, the second positioning block, the third positioning block and the guide rod are made of high-temperature-resistant ceramics.

A method for preparing curved glass comprises the following steps:

putting a glass blank into a hot bending mould prepared according to the method in the claim 2, putting the hot bending mould and the glass blank into a forming furnace together, heating until the glass is softened, keeping the temperature for 35-45min, vacuumizing the hot bending mould, forming vacuum in the hot bending mould, adsorbing the softened glass blank on a forming surface in the hot bending mould for forming to form a glass shell, and controlling the adsorption time for 3-5 min;

taking out the hot bending mould from the forming furnace, gradually cooling the hot bending mould and the glass shell in the hot bending mould until the temperature is cooled to room temperature, taking out the glass shell to obtain a curved surface glass semi-finished product, wherein the surface of the curved surface glass semi-finished product is rough;

edging the curved glass of the semi-finished product, specifically, edging the curved glass by using a CNC edging machine;

and fourthly, after the step of edging the curved glass, putting the curved glass in polishing solution for polishing.

Compared with the prior art, the invention has the beneficial effects that: the glass formula of the invention does not contain sulfur, fluorine and toxic components, the emission of the glass does not pollute the environment, the glass formula is environment-friendly and energy-saving, and the safety of the glass is ensured.

The hot bending die can reduce most of overlapping marks when the glass is hot bent, the flatness of the non-curved surface part is good, the hot bending die can not generate the phenomenon of uneven thickness caused by extrusion deformation on each surface of the glass by bending from top to bottom, the bending influence is only limited to the softened glass on the side edge, the quantity of the softened glass participating in the whole process is small, the control is easy, the influence of gas is small, the softened glass can also play a role in curved surface forming under the action of gravity, and the forming precision is high.

Drawings

FIG. 1 is an exploded view of a hot-bending die of the present invention;

FIG. 2 is a schematic perspective view of a convex positioning module according to the present invention;

FIG. 3 is a schematic perspective view of a spacing module according to the present invention;

FIG. 4 is a schematic perspective view of a concave positioning module according to the present invention;

fig. 5 is a front sectional structural view of the hot bending die of the present invention.

In the figure: 1. a convex positioning module; 101. pressing a plate; 102. a first positioning block; 103. a male die; 104. a second positioning block; 2. a limiting module; 201. a limiting plate; 202. a rectangular hole; 203. a guide hole; 204. a first positioning groove; 205. a third positioning block; 206. a second positioning groove; 3. a female positioning module; 301. a base plate; 302. a die cavity; 303. a guide bar; 304. a third positioning groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.