阅读说明：本技术 一种玻璃局部减薄加工方法 (Local thinning processing method for glass ) 是由 李涛 于 2020-04-10 设计创作，主要内容包括：本发明公开了一种玻璃局部减薄加工方法,包括：在玻璃的需要保留区域即不需要减薄的区域贴保护膜,且保护膜的模切覆盖区域比玻璃的需要保留区域的边缘大；用装夹板将玻璃的需要保留区域即不需要减薄的区域遮蔽起来,装夹板位于保护膜的正上方,且装夹板比保护膜的边缘大以完全遮蔽住保护膜,保护膜被夹在玻璃和装夹板中间；通过干式喷砂机对玻璃上的装夹板未遮蔽区域进行连续均匀的喷砂切削以达到玻璃局部减薄。本发明采用流水线干式喷砂设备进行喷砂减薄,人员只需要贴膜、装夹、喷砂、取片,就可以实现玻璃局部减薄,以上人工操作也可通过自动化方式实现,效率得到最大提高,成本也得到极大节约；而且不使用HF酸,环保且不会造成环境的污染。(The invention discloses a local thinning processing method of glass, which comprises the following steps: sticking a protective film on the area of the glass needing to be reserved, namely the area needing not to be thinned, wherein the die-cutting coverage area of the protective film is larger than the edge of the area needing to be reserved of the glass; the method comprises the following steps that a clamping plate is used for shielding a region, needing to be reserved, of glass, namely a region needing not to be thinned, the clamping plate is located right above a protective film, the clamping plate is larger than the edge of the protective film so as to completely shield the protective film, and the protective film is clamped between the glass and the clamping plate; and continuously and uniformly performing sand blasting cutting on the unshielded area of the clamping plate on the glass by using a dry sand blasting machine so as to achieve local thinning of the glass. The invention adopts the assembly line dry type sand blasting equipment to perform sand blasting thinning, and the personnel only need to paste a film, clamp, sand blast and take a sheet to realize the local thinning of the glass; and HF acid is not used, so that the method is environment-friendly and does not cause environmental pollution.)

1. The local glass thinning processing method is characterized by comprising the following steps of:

step one, sticking a film

Sticking a protective film on the area of the glass needing to be reserved, namely the area needing not to be thinned, wherein the die-cutting coverage area of the protective film is larger than the edge of the area needing to be reserved of the glass;

step two, clamping

The method comprises the following steps that a clamping plate is used for shielding a region, needing to be reserved, of glass, namely a region needing not to be thinned, the clamping plate is located right above a protective film, the clamping plate is larger than the edge of the protective film so as to completely shield the protective film, and the protective film is clamped between the glass and the clamping plate;

thirdly, sand blasting

And continuously and uniformly performing sand blasting cutting on the unshielded area of the clamping plate on the glass by using a dry sand blasting machine so as to achieve local thinning of the glass.

2. The method for locally thinning glass according to claim 1, characterized in that: the protective film in the first step is 500-2000 g/cm²And an adhesive film with a thickness of 0.04-0.15 mm.

3. The method for local thinning of glass according to claim 1 or 2, characterized in that: the die-cutting covering area of the protective film in the first step is 0.1-0.4mm larger than the edge of the area needing to be reserved of the glass.

4. The method for locally thinning glass according to claim 1, characterized in that: and the clamping plate in the second step is one of a PVC plate, a PP plate and a rubber sheet.

5. The method for local thinning of glass according to claim 1 or 4, characterized in that: and the thickness of the clamping plate in the second step is 0.5-5.0 mm.

6. The method for locally thinning glass according to claim 1, characterized in that: and the clamping plate in the second step is 0.1mm larger than the edge of the protective film.

7. The method for locally thinning glass according to claim 1, characterized in that: and in the third step, the dry sand blasting machine adopts 50-1000 # sand grains to perform sand blasting cutting on the glass.

8. The method for locally thinning glass according to claim 1, characterized in that: and in the third step, the sand blasting pressure adopts 0.2-0.6 Mpa of air pressure.

9. The method for locally thinning glass according to claim 7, wherein: the sand grains are made of one of alumina, green silicon carbide and black silicon carbide.

Technical Field

The invention relates to the technical field of glass processing, in particular to a local thinning processing method for glass.

Background

Smart phones have become essential electronic devices to be carried around, and the appearance design of the smart phones is also various and varied, and the smart phones are developed by many clients from the earliest 2D to the later 2.5D, to the current 3D and to the later 3.5D.

Glass is the material that smart mobile phone generally adopted at present, and along with glass shape becomes more and more three-dimensional, most need adopt finishing impression equipment to carry out local attenuate, fretwork, have sent very big challenge to the throughput and the machining efficiency of our present finishing impression board.

The main principle of thinning by using HF mixed acid in the prior art is as follows: HF-containing mixed acid and SiO in glass₂And other metal oxides react to peel off the surface layer of the glass, thereby realizing the thinning of the glass substrate. The formula of the glass thinning liquid in the current market is as follows: 10-20% of HF, 10-20% of strong acid (H)₂SO₄、HCl、HNO₃、H₃PO₄) 60 to 80 percent of water. The formula used as the glass thinning liquid has extremely low thinning efficiency and high waste treatment cost, mainly because: firstly, H generated in the reaction of the thinning liquid of the technical scheme₄SiO₄(glass sand) affects the etching rate and surface quality of glass, and the product is easy to have a convex point or uneven etching phenomenon; II, H produced in the reaction₂SiF₆Dissolving in thinning liquid to make the thinning effect of glass worse, and the thinning liquid can not be used continuously to cause waste liquid; thirdly, the proposal can generate a large amount of unusable dangerous wastes, and the treatment cost is very high.

Therefore, it is highly desirable to develop a high efficiency, low cost local thinning scheme.

Disclosure of Invention

The invention aims to solve the problems of low local thinning efficiency, high cost and high environmental protection requirement caused by adopting HF acid in the existing glass processing technology, and provides a high-efficiency, low-cost and environment-friendly glass local thinning processing method.

In order to achieve the purpose, the invention is implemented according to the following technical scheme:

a local thinning processing method for glass comprises the following steps:

step one, sticking a film

Sticking a protective film on the area of the glass needing to be reserved, namely the area needing not to be thinned, wherein the die-cutting coverage area of the protective film is larger than the edge of the area needing to be reserved of the glass;

step two, clamping

The method comprises the following steps that a clamping plate is used for shielding a region, needing to be reserved, of glass, namely a region needing not to be thinned, the clamping plate is located right above a protective film, the clamping plate is larger than the edge of the protective film so as to completely shield the protective film, and the protective film is clamped between the glass and the clamping plate;

thirdly, sand blasting

And continuously and uniformly performing sand blasting cutting on the unshielded area of the clamping plate on the glass by using a dry sand blasting machine so as to achieve local thinning of the glass.

Further, the protective film in the first step is 500-2000 g/cm²And an adhesive film with a thickness of 0.04-0.15 mm.

Further, the die-cutting coverage area of the protective film in the first step is 0.1-0.4mm larger than the edge of the area needing to be reserved of the glass.

Further, the clamping plate in the second step is one of a PVC plate, a PP plate and a rubber sheet.

Further, the thickness of the clamping plate in the second step is 0.5-5.0 mm.

Further, the clamping plate in the second step is 0.1mm larger than the edge of the protective film.

Furthermore, the dry sand blasting machine in the third step adopts 50-1000 # sand grains to perform sand blasting cutting on the glass.

Furthermore, the sand blasting pressure in the third step is 0.2-0.6 Mpa.

Preferably, the grit is made of one of alumina, green silicon carbide, black silicon carbide.

Compared with the prior art, the invention adopts the assembly line dry type sand blasting equipment to perform sand blasting thinning, and the personnel only need to paste a film, clamp, sand blast and take a sheet to realize the local thinning of the glass; and HF acid is not used, so that the method is environment-friendly and does not cause environmental pollution.

Drawings

Fig. 1 is a schematic structural diagram of an Iphonell product according to an embodiment of the present invention.

FIG. 2 is a process diagram of the present invention for localized thinning of glass.

Fig. 3 is a first process flow of a conventional 3.5D glass product.

Fig. 4 is a second conventional process flow of 3.5D glass product processing.

Fig. 5 shows a third process flow of the conventional 3.5D glass product.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

As shown in fig. 1, taking the processing of Iphonell products as an example, the traditional process adopts a cnc engraving and milling machine to perform rough processing, each product needs 10min of processing time, and only 120PCS can be processed in 20 hours by one device.

By adopting the local glass thinning processing method, 20000PCS can be processed in one device for 20 hours, and the specific processing time is shown in Table 1.

TABLE 1

The glass local thinning processing method specifically comprises the following processing steps:

example 1

Step one, sticking a film

As shown in fig. 2, a protective film 2 is attached to the area of the glass 1 which needs to be reserved, i.e. the area which does not need to be thinned, and the die-cutting coverage area of the protective film 2 is 0.1mm larger than the edge of the area of the glass which needs to be reserved; the protective film 2 is 500g/cm²0.04mm thick adhesive film, and the function of sticking the protective film is to accurately shield the place which does not need to be thinned, and simultaneously prevent sand grains from directly contacting the surface of the glass to cause the surface to appearSand phenomenon. The viscosity is lower than 500g/cm2, the film is easy to lift off in the sand blasting process, and the viscosity is higher than 2000g/cm²The film is not easy to tear after the sand blasting is finished; when the thickness of the adhesive film is less than 0.04mm, the adhesive film cannot effectively protect the glass, and the adhesive film with the thickness of more than 0.15mm is expensive and generally not used but still effective. The die-cut coverage area of the protective film is 0.1 larger than the edge of the area, needing to be reserved, of the glass, namely after the protective film is locally thinned, the reserved area is more than the actual product, and therefore in order to prevent precision deviation in the film pasting process, the reserved area is exposed in a sand blasting striking range, and the reserved area is thinned by sand blasting.

Step two, clamping

As shown in fig. 2, a clamping plate 3 with a thickness of 0.5mm is used for shielding a region of the glass 1 which needs to be reserved, namely a region which does not need to be thinned, the clamping plate is made of a PVC plate in the embodiment, the clamping plate is positioned right above the protective film 2, the clamping plate 3 is 0.1mm larger than the edge of the protective film 2 so as to completely shield the protective film 2, and the protective film 2 is clamped between the glass 1 and the clamping plate 3; the clamping plate 3 can prevent sand from directly acting on the adhesive film during sand blasting to break down the adhesive film; the clamping plate is 0.1mm larger than the adhesive film, so that the precision problem of processing and mounting of the plastic plate is considered, and the clamping plate can completely shield the adhesive film.

Thirdly, sand blasting

The method is characterized in that 50-1000 # sand grains are adopted, the sand grains are made of aluminum oxide in the embodiment, continuous and uniform sand blasting cutting is carried out on an unshielded area of a clamping plate on the glass through a dry sand blasting machine, and the sand blasting pressure adopts 0.2-0.6 Mpa so as to achieve local thinning of the glass. The sand blasting machine adopts an LES-1212 dry sand blasting machine produced by Hunan Lorsey company, and the equipment adopts fixed spray gun height and swing frequency; when the sand blasting pressure is lower than 0.2MPa, sand grains are not enough to cut off glass, and when the sand blasting pressure is higher than 0.6MPa, an air pipe, a valve and the like of equipment cannot operate for a long time under the high pressure. The sand blasting time can be realized by adjusting the speed of the conveyer belt, the speed of the conveyer belt can be controlled to achieve the local thinning amount of the glass required by a client, and sand grains with different grain sizes can be selected to achieve the surface roughness of a product required by the client; the larger the sand grains are, the faster the thinning efficiency is, otherwise, the slower the thinning efficiency is; meanwhile, the larger the sand grains, the larger the product surface roughness, and conversely, the smaller the roughness. The glass thinning rate corresponding to the size of the sand blasting sand grains and the surface roughness of the product correspondingly processed by different sand blasting sand grains are specifically shown in table 2, and the glass thinning rate and the surface roughness can be selected according to actual conditions during application.

TABLE 2

Example 2

Step one, sticking a film

As shown in fig. 2, a protective film 2 is attached to the area of the glass 1 which needs to be reserved, i.e. the area which does not need to be thinned, and the die-cutting coverage area of the protective film 2 is 0.4mm larger than the edge of the area of the glass which needs to be reserved; the protective film 2 adopts 2000g/cm²The adhesive film with the thickness of 0.15mm can accurately shield the place which does not need to be thinned by sticking the protective film, and simultaneously prevent sand grains from directly contacting the surface of the glass to cause the sand-feeding phenomenon on the surface. The viscosity is lower than 500g/cm²The film is easy to lift and fall off in the sand blasting process, and the viscosity is higher than 2000g/cm²The film is not easy to tear after the sand blasting is finished; when the thickness of the adhesive film is less than 0.04mm, the adhesive film cannot effectively protect the glass, and the adhesive film with the thickness of more than 0.15mm is expensive and generally not used but still effective. The die-cut coverage area of the protective film is 0.4mm larger than the edge of the area, needing to be reserved, of the glass, namely after the protective film is locally thinned, the reserved area is more than the actual area of the product, so that the reserved area is exposed in the sand blasting striking range in order to prevent precision deviation in the film pasting process, and the reserved area is thinned by sand blasting.

Step two, clamping

As shown in fig. 2, a clamping plate 3 with a thickness of 5.0mm is used for shielding a region needing to be reserved, namely a region needing not to be thinned, of the glass 1, in the embodiment, the clamping plate is a PP plate, the clamping plate is positioned right above the protective film 2, the clamping plate 3 is 0.1mm larger than the edge of the protective film 2 so as to completely shield the protective film 2, and the protective film 2 is clamped between the glass 1 and the clamping plate 3; the clamping plate 3 can prevent sand from directly acting on the adhesive film during sand blasting to break down the adhesive film; the clamping plate is 0.1mm larger than the adhesive film, so that the precision problem of processing and mounting of the plastic plate is considered, and the clamping plate can completely shield the adhesive film.

Thirdly, sand blasting

Adopt the sand grain of 50 ~ 1000#, the sand grain adopts aluminium oxide, green silicon carbide, black silicon carbide to make among the embodiment, carries out continuous even sandblast cutting through dry-type sand blasting machine to the clamping plate unshielded region on the glass, and the sandblast pressure adopts 0.2 ~ 0.6 Mpa's atmospheric pressure to reach the local attenuate of glass. The sand blasting machine adopts an LES-1212 dry sand blasting machine produced by Hunan Lorsey company, and the equipment adopts fixed spray gun height and swing frequency; when the sand blasting pressure is lower than 0.2MPa, sand grains are not enough to cut off glass, and when the sand blasting pressure is higher than 0.6MPa, an air pipe, a valve and the like of equipment cannot operate for a long time under the high pressure. The sand blasting time can be realized by adjusting the speed of the conveyer belt, the speed of the conveyer belt can be controlled to achieve the local thinning amount of the glass required by a client, and sand grains with different grain sizes can be selected to achieve the surface roughness of a product required by the client; the larger the sand grains are, the faster the thinning efficiency is, otherwise, the slower the thinning efficiency is; meanwhile, the larger the sand grains, the larger the product surface roughness, and conversely, the smaller the roughness. The glass thinning rate corresponding to the size of the sand blasting sand grains and the surface roughness of the product correspondingly processed by different sand blasting sand grains are specifically shown in table 2, and the glass thinning rate and the surface roughness can be selected according to actual conditions during application.

TABLE 2

Example 3

Step one, sticking a film

As shown in fig. 2, a protective film 2 is attached to the area of the glass 1 which needs to be reserved, i.e. the area which does not need to be thinned, and the die-cutting coverage area of the protective film 2 is 0.2mm larger than the edge of the area of the glass which needs to be reserved; the protective film 2 is 1000g/cm²0.1mm thick adhesive film, and protective filmThe function is to accurately shield the place which does not need to be thinned, and simultaneously prevent sand grains from directly contacting the surface of the glass, so that the sand feeding phenomenon on the surface is caused. The viscosity is lower than 500g/cm²The film is easy to lift and fall off in the sand blasting process, and the viscosity is higher than 2000g/cm²The film is not easy to tear after the sand blasting is finished; when the thickness of the adhesive film is less than 0.04mm, the adhesive film cannot effectively protect the glass, and the adhesive film with the thickness of more than 0.15mm is expensive and generally not used but still effective. The die cutting covering area of the protective film is 0.2mm larger than the edge of the area, needing to be reserved, of the glass, namely after the protective film is locally thinned, the reserved area is more than the actual area of the product, so that the reserved area is exposed in the sand blasting striking range in order to prevent precision deviation in the film pasting process, and the reserved area is thinned by sand blasting.

Step two, clamping

As shown in fig. 2, a clamping plate 3 with a thickness of 2.0mm is used for shielding a region needing to be reserved, namely a region needing not to be thinned, of the glass 1, the clamping plate is made of rubber in the embodiment, the clamping plate is positioned right above the protective film 2, the clamping plate 3 is 0.1mm larger than the edge of the protective film 2 so as to completely shield the protective film 2, and the protective film 2 is clamped between the glass 1 and the clamping plate 3; the clamping plate 3 can prevent sand from directly acting on the adhesive film during sand blasting to break down the adhesive film; the clamping plate is 0.1mm larger than the adhesive film, so that the precision problem of processing and mounting of the plastic plate is considered, and the clamping plate can completely shield the adhesive film.

Thirdly, sand blasting

Adopt the sand grain of 50 ~ 1000#, the sand grain adopts aluminium oxide, green silicon carbide, black silicon carbide to make among the embodiment, carries out continuous even sandblast cutting through dry-type sand blasting machine to the clamping plate unshielded region on the glass, and the sandblast pressure adopts 0.2 ~ 0.6 Mpa's atmospheric pressure to reach the local attenuate of glass. The sand blasting machine adopts an LES-1212 dry sand blasting machine produced by Hunan Lorsey company, and the equipment adopts fixed spray gun height and swing frequency; when the sand blasting pressure is lower than 0.2MPa, sand grains are not enough to cut off glass, and when the sand blasting pressure is higher than 0.6MPa, an air pipe, a valve and the like of equipment cannot operate for a long time under the high pressure. The sand blasting time can be realized by adjusting the speed of the conveyer belt, the speed of the conveyer belt can be controlled to achieve the local thinning amount of the glass required by a client, and sand grains with different grain sizes can be selected to achieve the surface roughness of a product required by the client; the larger the sand grains are, the faster the thinning efficiency is, otherwise, the slower the thinning efficiency is; meanwhile, the larger the sand grains, the larger the product surface roughness, and conversely, the smaller the roughness. The glass thinning rate corresponding to the size of the sand blasting sand grains and the surface roughness of the product correspondingly processed by different sand blasting sand grains are specifically shown in table 2, and the glass thinning rate and the surface roughness can be selected according to actual conditions during application.

TABLE 2

As shown in fig. 3, 4 and 5, for the three processing techniques of the existing 3.5D glass product, in the case of local thinning of the 3.5D product, there are three feasible techniques to be implemented, and for the three techniques, local thinning can be implemented by using the local thinning processing method of the glass of the present invention.

The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.