Folding screen electronic device front cover processing technology

Abstract

A folding screen electronic device front cover processing technology, comprising: cutting a glass original piece to obtain a glass sheet, the glass sheet having a user surface and a system surface, the system surface having a to-be-slotted area and a non-slotted area; preparing a grinding machine thinning clamp, the grinding machine thinning clamp being provided with a vacuum air duct, the upper surface of the grinding machine thinning clamp having a first adsorption area corresponding to the to-be-slotted area and provided with a plurality of adsorption holes communicating with the vacuum air duct, and a second adsorption area corresponding to the non-slotted area and provided with an air groove communicating with the vacuum air duct, the diameter of the adsorption holes being less than or equal to 2 mm, and the width of the air groove being greater than the diameter of the adsorption holes; fixing the grinding machine thinning clamp and clamping the glass sheet; mechanically thinning the to-be-slotted area on the glass sheet by using a grinding wheel; double-sided thinning the mechanically thinned glass sheet by using NaOH; PVD coating and one-time hardening the bending area of the glass sheet; after the bending area is stripped, the glass sheet is subjected to secondary hardening, so as to obtain a folding screen electronic device front cover.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of folding screen glass processing, in particular to a folding screen electronic device front cover processing technology for realizing grinding slot thinning and chemical thinning of a folding screen electronic device front cover. BACKGROUND

[0002] Ultra-thin glass (UTG for short) is glass with a thickness of 0.1-1.1mm, which has certain folding, bending and curling advantages, and is widely used in folding screens of electronic devices to meet the 360° bending or twisting of folding screens. The ultra-thin glass used as a folding screen is mainly thinned on the folding area (bending position) of the glass sheet to meet the needs of glass folding (rather than overall thinning of the glass), and the light transmission performance and flexibility of the thinned glass sheet are improved, and the weight is also reduced. However, as the thickness of the thinned area decreases, the mechanical strength of the glass decreases, and the thinned area of the glass sheet is prone to breakage, and any impurities or micro-cracks in the processing process will have a serious negative impact on the thinned area of the glass. The industry mainly thins the glass sheet locally through mechanical thinning. In the process of mechanical thinning, the glass sheet needs to be positioned and clamped to ensure the consistency of the thinned area. However, the industry currently mainly positions the glass sheet through negative pressure adsorption or / and clamp positioning. As the glass sheet is thinned, the thinned area of the glass sheet is prone to damage due to impact or pressure, thereby causing the product breakage rate and the non-conforming rate to rise, the production efficiency of ultra-thin glass to be insufficient, and the processing cost of ultra-thin glass to increase. SUMMARY

[0003] Therefore, it is necessary to provide a folding screen electronic device front cover processing technology with low breakage rate, high product yield and production efficiency, and low processing cost in view of the above problems.

[0004] A folding screen electronic device front cover processing technology for realizing thinning of a bending area of a folding screen electronic device front cover includes the following steps:

[0005] S1, cutting a glass original sheet to obtain a glass sheet to be processed, the glass sheet having a user side facing a user when in use and a system side facing the inside of an electronic device, the system side having a slotting area to be slotted for forming a bending area and a non-slotting area beside the slotting area to be slotted;

[0006] S2, prepare a grinding machine thinning clamp, a vacuum air duct is provided in the grinding machine thinning clamp for communication with the external vacuum equipment, the upper surface of the grinding machine thinning clamp forms an adsorption platform, the adsorption platform is provided with a first adsorption area corresponding to the to-be-grooving area and a second adsorption area corresponding to the non-grooving area, a plurality of adsorption holes are provided in the first adsorption area and communicated with the vacuum air duct, a gas groove is provided in the second adsorption area and communicated with the vacuum air duct, the diameter of the adsorption hole is less than or equal to 2mm, the width of the gas groove is greater than the diameter of the adsorption hole, and the total air intake of the first adsorption area per unit time is less than that of the second adsorption area;

[0007] S3, fix the grinding machine thinning clamp on the grinding machine table, and clamp the glass sheet on the grinding machine thinning clamp, so that the user surface of the glass sheet is attached to the adsorption platform, the to-be-grooving area of the glass sheet corresponds to the first adsorption area, and the non-grooving area of the glass sheet corresponds to the second adsorption area;

[0008] S4, using the grinding wheel on the grinding machine to mechanically thin the to-be-grooving area on the glass sheet;

[0009] S5, using NaOH to double-side thin the glass sheet after mechanical thinning;

[0010] S6, PVD coating is performed on the bending area of the glass sheet, and the glass sheet is hardened once after coating; after the bending area is stripped, the glass sheet is hardened twice to obtain a folding screen electronic device front cover.

[0011] In one of the embodiments, after mechanical thinning, the thickness of the bending area is 0.095-0.115mm; after double-side thinning, the thickness of the bending area is 0.03-0.05mm.

[0012] In one of the embodiments, the grinding wheel comprises a wheel body, a through hole is provided in the middle of the wheel body for penetrating the grinding machine motor shaft, the ring side surface of the wheel body forms an annular grinding surface, the two opposite side surfaces of the wheel body are respectively protruded to form two annular steps coaxial with the through hole, the outer diameter of the annular step is smaller than the diameter of the annular grinding surface, and there is an arc transition between the annular step and the annular grinding surface.

[0013] In one of the embodiments, after the glass sheet is hardened twice in step S6, an adhesive is applied to the bending area of the glass sheet system surface to form an adhesive layer, and the thickness of the adhesive layer is the height difference between the to-be-grooving area and the non-grooving area.

[0014] In one of the embodiments, the surface roughness Ra of the upper surface of the adsorption platform is 0.003mm, and the flatness of the glass sheet attached to the adsorption platform is less than 0.01mm.

[0015] In one of the embodiments, the upper surface of the grinding machine thinning clamp is provided with a plurality of limiting blocks arranged along the edge of the adsorption platform and arranged along a U-shaped path, the upper surface of the limiting block is higher than the upper surface of the adsorption platform, and a gap is formed between adjacent limiting blocks.

[0016] In one of the embodiments, a plurality of adsorption holes are arranged in a square array in the first adsorption area, the row spacing between the adsorption holes in the first adsorption area is 5mm, and the column spacing between the adsorption holes is 6.3mm.

[0017] In one of the embodiments, a hollow groove is formed in the lower surface of the grinding machine thinning clamp at a position corresponding to the first adsorption area, a plurality of air guide holes are formed in the groove top surface of the hollow groove and communicate with the vacuum air duct, each air guide hole communicates with two adjacent adsorption holes on the first adsorption area, and a shielding part for locally shielding the adsorption holes is formed between the two adjacent air guide holes.

[0018] In one of the embodiments, a guide hole is formed in the adsorption platform in the second adsorption area and communicates with the vacuum air duct.

[0019] In one of the embodiments, the air groove includes a plurality of annular guide grooves arranged around the guide hole in a circle, each annular guide groove sequentially communicates and communicates with the guide hole, and the annular guide groove has a square ring structure or a circular ring structure.

[0020] The folding screen electronic device front cover processing technology of the present application adopts a vacuum adsorption method to position and clamp the glass sheet to be thinned, and a first adsorption area and a second adsorption area corresponding to the glass sheet to-be-grooving area and the non-grooving area are respectively arranged on the adsorption platform of the grinding machine thinning clamp, the adsorption holes with a hole diameter less than or equal to 2mm are formed on the first adsorption area, the air groove with a width greater than the hole diameter of the adsorption hole is formed on the second adsorption area, and the total air intake of the first adsorption area per unit time is less than that of the second adsorption area. This design not only firmly adsorbs the glass sheet to be thinned by the negative pressure generated by the compressor to prevent the glass sheet from shifting during processing, but also reduces the adsorption force of the to-be-grooving area, avoids the breakage of the grinding machine thinned glass caused by excessive local adsorption force after thinning, and also plays a buffering role when the air pressure fluctuates, avoiding the problem of broken pieces caused by excessive adsorption force fluctuation in the to-be-grooving area, reducing the glass breakage rate and the defective rate, and improving the production efficiency of the ultra-thin glass. In addition, the combination of grinding thinning and NaOH chemical thinning can not only avoid the problem of increased breakage rate of the bending area of the glass caused by grinding and thinning to a thickness less than 0.08mm, but also avoid the problem of excessive thinning removal and increased cost caused by etching the entire glass surface with NaOH system alone, thereby reducing the processing cost of the ultra-thin glass. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure diagram of the folding screen electronic device front cover in one embodiment of the present application;

[0022] Figure 2 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0023] Figure 3 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0024] Figure 4 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0025] Figure 5 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0026] Figure 6 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0027] Figure 7 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0028] Figure 8 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0029] Figure 9 Structure diagram of the grinding machine thinning clamp in one embodiment of the present application;

[0030] Figure 10 Structure diagram of the folding screen electronic device front cover in one embodiment of the present application; DETAILED DESCRIPTION

[0031] To make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0032] The application discloses a kind of by grinder slotting and NaOH system etching combination to realize the thinning of folding screen electronic equipment front cover bending area, to improve product bending area thinning good product rate, and realize the bending function of folding screen glass thinning area, it is mechanically thinned to the bending area on glass sheet, chemical etching is used to the overall thinning of glass sheet, subsequently, the mechanically thinned area on glass sheet is protected by PVD coating, and it is hardened once, after stripping, the entire glass sheet is hardened twice, to improve the surface quality and mechanical strength of folding screen glass sheet.In the embodiment, the advantages of the glass sheet are mechanically thinned by grinder are as follows: 1) grinder processing can realize high-precision machining, thickness tolerance can reach below ±0.01mm, can satisfy the thickness requirement of folding screen glass bending portion thinning process;2) grinder processing is not limited by workpiece material and shape, and is widely applicable, can satisfy various glass folding screen bending area grinder thinning including 7418 model;3) simple process, cheap.

[0033] Specifically, please combine Figures 1-10 The folding screen electronic equipment front cover processing technology of the embodiment includes the following steps:

[0034] S1, cut glass original piece to obtain glass sheet 10 to be processed, the glass sheet has user side towards user when using the user surface and the system surface towards the inside of electronic device, the system surface has to be slotted area 101 for forming bending area and non-slotted area 102 on the side of to be slotted area 101.Glass sheet user surface is protected by silk screen acid-resistant protective oil to avoid user surface being scratched by hard object in subsequent production process or transportation process and other adverse phenomena, to improve product quality.

[0035] S2, prepare the grinding machine thinning clamp 20, the grinding machine thinning clamp 20 is designed as a vacuum adsorption clamp. A vacuum air duct 201 for communicating with an external vacuum device is formed in the grinding machine thinning clamp 20, and an adsorption platform 202 is formed on the upper surface of the grinding machine thinning clamp 20. The adsorption platform 202 is provided with a first adsorption area corresponding to the to-be-grooving area 101 and a second adsorption area corresponding to the non-grooving area 102. A plurality of adsorption holes 203 are formed in the first adsorption area and communicate with the vacuum air duct 201. A gas groove 204 is formed in the second adsorption area and communicates with the vacuum air duct 201. The diameter of the adsorption hole 203 is less than or equal to 2 mm. The width of the gas groove 204 is greater than the diameter of the adsorption hole 203. The total air intake of the first adsorption area per unit time is less than that of the second adsorption area. That is, the to-be-grooving area 101 on the glass sheet is adsorbed and fixed by the adsorption hole 203 with a smaller diameter, and the non-grooving area 102 on the glass sheet is adsorbed by the gas groove 204 with a larger width. Due to the difference in size between the adsorption hole and the gas groove 204, the air intake and the air intake rate are also different, so that the adsorption force of the first adsorption area on the to-be-grooving area 101 on the glass sheet is less than that of the second adsorption area on the non-grooving area 102 on the glass sheet. In this way, the glass sheet is firmly adsorbed by the second adsorption area to prevent displacement caused by friction between the glass sheet and the grinding wheel during the grinding machine grooving and thinning process, and the glass sheet is prevented from breaking due to excessive local adsorption force on the grooving part of the glass after the grinding machine thins the glass. It can also play a buffering role when the air pressure fluctuates, avoiding the problem of broken pieces caused by excessive adsorption force fluctuation in the grooving area of the glass sheet.

[0036] In an embodiment, a plurality of adsorption holes 203 are arranged in a square array in the first adsorption area. The row spacing between the adsorption holes 203 in the first adsorption area is 5 mm, the column spacing between the adsorption holes 203 is 6.3 mm, the arrangement length of the adsorption holes 203 in the first adsorption area is equal to the length of the first adsorption area, and the arrangement width of the adsorption holes 203 in the first adsorption area is equal to the width of the first adsorption area. In other words, a plurality of adsorption holes 203 are arranged in a predetermined row spacing and column spacing to cover the entire first adsorption area, so as to ensure that the to-be-grooving area 101 on the glass sheet can be uniformly and stably adsorbed on the grinding machine thinning clamp 20, and to ensure that the grooving area of the glass sheet product is stably stressed to prevent breakage.

[0037] Further, the lower surface of the grinding machine thinning clamp 20 is provided with a hollow groove 205 at the position corresponding to the first adsorption area. The top surface of the hollow groove 205 is provided with a plurality of air guide holes 206 which are in communication with the vacuum air duct 201. Each air guide hole 206 is in communication with two adjacent adsorption holes 203 on the first adsorption area, and the adjacent two air guide holes 206 form a shielding part for locally shielding the adsorption holes. By providing the hollow groove 205, the air pressure in the vacuum air duct 201 can be conducted to the adsorption holes 203 through the air guide holes 206. The air pressure in the vacuum air duct 201 is gradually divided through the air guide holes and the adsorption holes, so as to reduce the adsorption force at the first adsorption area and avoid glass overload and breakage. In addition, during the process of grinding and thinning the bending area of the glass by the grinding wheel, cooling liquid needs to be sprayed on the surface of the glass after the glass to be thinned is adsorbed on the clamp, so as to avoid glass breakage caused by temperature rise during grinding and thinning of the bending area of the glass by the grinding wheel. During this process, part of the cooling liquid entering the adsorption holes will further enter the hollow groove through the air guide holes and be sucked away by the vacuum pump of the compressor, thereby reducing the retention of the cooling liquid in the adsorption holes. The hollow groove provides a storage space for the cooling liquid, which can avoid the problem of adsorption hole blockage caused by the accumulation of a large amount of cooling liquid in the adsorption holes, and ensure the stability of the adsorption force in the first adsorption area.

[0038] In the embodiment, the vacuum air duct 201 penetrates through the two opposite sides of the grinding machine thinning clamp 20 and forms an air vent 207 on the side of the grinding machine thinning clamp 20. The air vent 207 is used to install an air pipe joint, so as to communicate the grinding machine thinning clamp 20 with an external vacuum equipment (such as a compressor). When the grinding machine thinning clamp 20 is fixed on the grinding machine table, the grinding machine table seals the groove opening of the hollow groove 205. After the air vent 207 of the grinding machine thinning clamp 20 is communicated with the compressor, negative pressure is formed in the vacuum air duct 201 at the positions corresponding to the first adsorption area and the second adsorption area. The air above the first adsorption area sequentially enters the vacuum air duct 201 through the adsorption holes and the air guide holes 206 under the action of negative pressure, and is further transmitted to the compressor through the vacuum air duct 201 and the air vent 207, so as to form an air flow channel. Since each air guide hole 206 is in communication with two adjacent adsorption holes on the first adsorption area, and the shielding part locally shields the adsorption holes, it can also be understood that the air guide holes 206 are arranged in a staggered manner with the adsorption holes. In this way, the air guide holes 206 are in communication with the adsorption holes and the vacuum air duct 201, and further reduce the aperture of the adsorption holes by locally shielding the adsorption holes, so as to further reduce the impact of the first adsorption area on the product processing part and avoid product breakage, thereby improving the yield of the product. In order to avoid air leakage at the hollow groove 205, the groove edge of the hollow groove 205 is provided with a sealing rubber ring in the embodiment. When the grinding machine thinning clamp 20 is arranged on the grinding machine table, the sealing rubber ring is deformed under the extrusion of the grinding machine table to seal the gap of the groove edge of the hollow groove 205, so as to avoid air leakage at the hollow groove 205 and ensure the stability of the air pressure in the vacuum air duct 201 and the reliability of the product adsorption.

[0039] Further, the radius of the air passage 207 is 4.4 mm, the distance from the upper edge of the air passage 207 to the upper surface of the adsorption platform 202 is 14.6 mm, the distance from the lower edge of the air passage 207 to the lower surface of the grinding thinning clamp 20 is 10.6 mm, the radius of the air guide hole 206 is 2.25 mm (the hole diameter is 4.5 mm), the depth of the hollow groove 205 is 3 mm, the distance from the lower edge of the air passage 207 to the top surface of the hollow groove 205 is 7.6 mm, and the height of the adsorption platform 202 is 10 mm. In this embodiment, the distance from the upper edge of the air passage 207 to the upper surface of the adsorption platform 202 is designed to be 14.6 mm, and the distance from the lower edge of the air passage 207 to the lower surface of the grinding thinning clamp 20 is designed to be 10.6 mm, which can effectively avoid the problem of the adsorption hole 203 area and the air guide hole 206 setting area (also called hollow part) being depressed due to the stress on the grinding thinning clamp 20 during the grinding and slotting process, thereby prolonging the service life of the grinding thinning clamp 20 and ensuring the reliability of the positioning of the glass sheet. The height of the adsorption platform 202 is designed to be 10 mm, which provides conditions for the repair of the grinding thinning clamp 20 due to unqualified flatness after installation, thereby increasing the service life of the grinding thinning clamp 20. The depth of the hollow groove 205 is designed to be 3 mm, so that the cooling liquid in the grinding and thinning process of the glass grinding machine can enter the hollow groove 205 through the adsorption hole 203 and the air guide hole 206, thereby avoiding the problem of adsorption hole blockage caused by the accumulation of a large amount of cooling liquid in the adsorption hole, and ensuring the stable adsorption of the bent part of the glass. The radius of the air passage 207 is designed to be 4.4 mm, which can ensure sufficient air supply of the grinding thinning clamp 20, and at the same time, avoid the stress deformation of the grinding thinning clamp 20 during the grinding and thinning process due to the excessively large hole diameter of the air passage 207 of the grinding thinning clamp 20, thereby prolonging the service life of the grinding thinning clamp 20.

[0040] In an embodiment, the adsorption platform 202 is provided with a guide hole 208 in the second adsorption area, which is in communication with the vacuum air duct 201 and corresponds to the middle part of the air groove 204. By arranging the air groove 204 in the second adsorption area, the negative pressure contact area between the non-grooving area 102 of the product and the adsorption platform 202 is increased, thereby improving the stability and reliability of the positioning of the product on the adsorption platform 202. Further, the air groove 204 includes a plurality of annular guide grooves arranged around the guide hole 208 in a circle, each annular guide groove is sequentially communicated and communicated with the guide hole 208, and the annular guide groove has a quadrilateral ring structure or a circular ring structure. Preferably, the diameter of the guide hole 208 is 8 mm, and the depth of the air groove 204 is 8 mm. In this embodiment, the annular guide groove has a quadrilateral ring structure, that is, the air groove 204 has a character-shaped structure, so that the non-grooving area 102 of the product is uniformly stressed. Of course, in other embodiments, the air groove 204 can also have a labyrinth structure, a mesh structure, a field-shaped structure, a font-shaped structure or other structures, and the projection pattern of the air groove 204 on the upper surface of the adsorption platform 202 can also be a two-dimensional code pattern, which will not be described here.

[0041] In addition, in this embodiment, the grinding machine thinning clamp 20 is made of acrylic material, which has the advantages of convenient processing, anti-deformation performance, moderate strength and hardness, colorless and transparent, light weight and excellent corrosion resistance under the use condition of the grinding machine. It can avoid defects such as surface oxidation of metal materials and the trouble of maintenance before and after use, and the acrylic forming surface precision and surface quality can also meet the requirements of the grinding machine for grooving and thinning glass; in addition, the acrylic raw material is abundant and cheap, which is conducive to reducing the production cost of the grinding machine thinning clamp 20.

[0042] In addition, in an embodiment, please refer to Figure 5 , the upper surface of the grinding machine thinning clamp 20 is provided with a plurality of limiting blocks 209 arranged along the edge of the adsorption platform 202 and arranged along the U-shaped path, the upper surface of the limiting block 209 is higher than the upper surface of the adsorption platform 202, and the gap 2091 is formed between the adjacent limiting blocks 209, the limiting block 209 is fixed on the upper surface of the grinding machine thinning clamp 20 by screws or pins, and the plurality of limiting blocks 209 and the adsorption platform together form a glass clamping area. In this way, while limiting the glass through the limiting block, the gap 2091 between the adjacent limiting blocks 209 forms a sampling platform, when the glass sheet is processed, the thin sheet is inserted into the gap 2091, so that the thin sheet enters the lower part of the glass, and the glass can be taken out, reducing the difficulty of taking out the glass.

[0043] S3, fix the grinding machine thinning clamp 20 on the grinding machine, and clamp the glass sheet on the grinding machine thinning clamp 20, so that the user surface of the glass sheet is attached to the adsorption platform 202, the to-be-grooving area 101 of the glass sheet corresponds to the first adsorption area, and the non-grooving area 102 of the glass sheet corresponds to the second adsorption area.

[0044] Specifically, the screw hole of the grinder thinning fixture 20 is fixed with the screw hole of the base 40 with magnetism by using a screw rod, the base 40 is adsorbed on the grinder fixture platform together with the grinder thinning fixture 20 by using the magnetism of the base 40, the air hole 207 is connected with the compressor air pipe, then the glass sheet is fixed on the grinder thinning fixture 20 by vacuum adsorption, the to-be-grooving area 101 of the glass sheet corresponds to the first adsorption area, the non-grooving area 102 of the glass sheet corresponds to the second adsorption area, and the grinding wheel is installed on the grinder in sequence, the height of the grinding wheel and the glass sheet is adjusted.

[0045] In the embodiment, the surface roughness Ra of the upper surface of the adsorption platform 202 is 0.003 mm, the positioning accuracy of the product can be improved by changing the surface roughness Ra of the adsorption platform 202, and the flatness of the glass sheet attached to the adsorption platform 202 is less than 0.01 mm. After the grinder thinning fixture 20 is fixed on the grinder machine table, the flatness thereof needs to be tested, if the flatness test result is greater than 0.01 mm, the assembled fixture of the grinder (i.e. the grinding fixture surface is ground flat) can be used, until the flatness test result of the fixture assembled on the grinder operation platform is less than 0.01 mm, so as to prevent the overall flatness of the fixture from being unqualified due to the flatness superposition of each component after the fixture is assembled, and then the abnormal thickness unevenness or broken piece abnormality of the folding screen glass thinning area occurs.

[0046] S4, the to-be-grooving area 101 of the glass sheet is mechanically thinned by using the grinding wheel 30 on the grinder, and the cooling liquid is sprayed on the thinned area at the same time, and the debris on the glass surface is cleaned.

[0047] In this embodiment, the grinding wheel 30 includes a wheel body 301, a through hole 302 is formed in the middle of the wheel body 301 for passing the motor shaft of the grinding machine, the annular side surface of the wheel body 301 forms an annular grinding surface 303, and the two opposite side surfaces of the wheel body 301 are respectively protruded to form two annular steps 304 coaxial with the through hole 302, the outer diameter of the annular step 304 is smaller than the diameter of the annular grinding surface 303, and there is an arc transition part 305 between the annular step 304 and the annular grinding surface 303. It can also be understood that, in this embodiment, the grinding wheel 30 is actually a stepped structure, and the step is formed between the annular step 304 and the annular grinding surface 303. In this way, not only can the gap formed by laser slotting thinning and CNC slotting thinning be avoided, but also the slotting removal amount (i.e. the slotting depth of the bending area on the glass sheet) of the grinding wheel 30 can be controlled by the step height between the annular step 304 and the annular grinding surface 303. The slotting depth of the glass sheet can be controlled by selecting a grinding wheel 30 with different step heights. At the same time, the annular step 304 can also repair the horn formed by the grinding wheel 30 not advancing along a straight line, ensuring that the joint line of the slotting area is a straight line. In addition, during the slotting process of the grinding wheel 30 on the glass, the user surface of the glass sheet is silk-screen printed with acid-resistant protective oil, which can prevent the user surface of the glass sheet from being scratched during the slotting process of the grinding machine. The setting of the arc transition part 305 between the annular step 304 and the annular grinding surface 303 ensures the smooth transition of the grinding slot thinning area on the glass sheet. It should be noted that, in this embodiment, whether the grinding wheel 30 is an electroplated grinding wheel 30 or a sintered grinding wheel 30, an 800# grinding wheel needs to be used to reduce the scratch depth on the surface of the glass sheet during the slotting process. Since the electro-grinding layer of the 800# grinding wheel is relatively thick, the service life of the grinding wheel 30 can be prolonged, thereby reducing the thinning cost of the glass. In addition, the surface roughness Sa of the 800# grinding wheel grinding thinning folded screen glass is less than 500 nm, which can meet the surface finish and roughness of the grinding thinning area of the folded screen glass, and improve the surface quality of the glass sheet.

[0048] After adjusting the height of the grinding wheel 30 and the glass sheet, the grinding machine is started to grind the slotting area of the folded screen until the thickness of the slotting area (bending area) of the glass sheet reaches 0.095-0.115 mm. Then the glass is removed and the appearance is checked and the thickness of the bending area of the folded screen is measured. After mechanical thinning of the glass, the slotting area on the glass needs to be polished to reduce the surface scratches of the slotting area, and the surface quality of the folded screen glass is optimized. Specifically, pig hair is used to polish the bending area of the glass to reduce the scratches caused by the grinding thinning. After polishing with pig hair, the carpet is used to polish the bending area of the glass until the appearance of the bending area of the glass meets the subsequent processing requirements. After polishing the glass sheet, the acid-resistant protective oil silk-screen printed on the user surface of the folded screen glass sheet needs to be removed using an alkaline stripping solution.

[0049] S5. Use NaOH to thin the mechanically thinned glass sheet on both sides until the thickness of the glass sheet at the bending part meets the requirements of foldable screen glass.

[0050] Using NaOH etching to thin foldable screen glass has the following advantages over traditional HF thinning:

[0051] 1) Uniformity: NaOH etching thins the foldable screen glass at a rate about 3 times slower than HF. When using a vertical chemical processing system, the product will not experience uneven etching due to residual chemicals dripping under gravity during the process of changing from the etching tank to the clear water tank.

[0052] 2) Easy to control: Since the thickness requirement for the bending area is 0.03-0.05mm, for samples with a thickness greater than 0.08mm in the thinning region, they are classified according to the thickness of the bending region before etching in the NaOH system. Samples of different thicknesses correspond to different etching times in the NaOH system. Because the thinning rate of the NaOH etching system at the same concentration is 1 / 3 of that of the HF system, the NaOH etching thinning system is more likely to avoid many defects such as uneven etching, product deformation, and ripples that occur in the HF system, making the glass thinning process easier to control.

[0053] 3) Environmentally friendly: The NaOH etching and thinning process does not require the use of harmful organic solvents and acidic solutions, making it environmentally friendly.

[0054] Furthermore, when using HF for overall thinning, the sample thickness is reduced from 0.2 mm to 0.03-0.05 mm, which is not only expensive, time-consuming, and wasteful, but also prone to breakage and uneven thickness. In this embodiment, for samples with a thickness greater than 0.08 mm in the grinding machine grooved area, after mechanical polishing to reduce surface scratches, NaOH etching is used to thin the entire glass sheet to a thickness of 0.03-0.05 mm at the bending area. The NaOH etching system consists of 50% NaOH and 5% NaG (sodium gluconate), and the etching temperature is 115-125℃.

[0055] The chemical reaction equation is as follows: SiO2 + 2NaOH = Na2SiO3 + H2O; SiO3 2- + H2O = H2SiO3 + 2OH - Among them, SiO3 2- The hydrolysis produces H2SiO3 (commonly known as: " Water glass ” The coating of SiO3 on the etched glass surface affects the etching effect; adding 5% NaG can inhibit the formation of SiO3. 2- Hydrolysis of H2SiO3 eliminated the effect of etching.

[0056] The etching temperature is 115-125℃, and the etching thinning system speed is significantly slower than the HF thinning speed. When the etching is performed to half of the theoretically calculated required time, the measured thickness of the glass etched by the NaOH system is again chemically thinned in batches to reduce the breakage rate of the chemically thinned glass and the rate of uneven etching thickness.

[0057] In an embodiment, after mechanical thinning, the thickness of the bending area is 0.095-0.115mm; after double-side thinning, the thickness of the bending area is 0.03-0.05mm, so that the problem of increased breakage rate caused by the thickness of the thinning area on the glass sheet being lower than 0.08mm during the slotting process of the grinding machine can be avoided, and the problem of increased processing cost caused by excessive thinning removal amount during the etching of the whole glass sheet by the NaOH system can also be avoided. In this embodiment, the grinding machine slotting and the NaOH system etching are combined to thin the system surface of the glass sheet to make it have a bending function. The slotting depth, i.e. the mechanical thinning removal amount, is the height of the transition part between the to-be-slotted area 101 and the slotted area, which needs to be determined according to the user's requirements to determine the thickness of the incoming material, and then the ideal grinding machine slotting reserved thickness 0.095-0.115mm is subtracted to calculate the thickness removal amount, which is the slotting depth. The to-be-slotted area 101 and the transition part of the slotted area are designed as arc surfaces, and their contour shapes are adapted to the contour shape of the arc transition part 305 on the grinding wheel 30.

[0058] S6, PVD coating is performed on the bending area of the glass sheet, and the glass sheet after coating is hardened once; after the bending area is stripped, the glass sheet is hardened twice to obtain a folding screen electronic device front cover.

[0059] In this embodiment, the thickness of the folding screen glass bending area is thinner than the non-bending area because the thickness of the folding screen glass grinding machine thinning area is 0.03-0.05mm and the thickness of the non-slotted area 102 is >0.05mm. If the hardening parameters that meet the thickness of the glass bending area are used to harden the whole glass, the chemical strengthening time of the non-bending area of the folding screen glass will be too short and the strength will be low. If the hardening parameters that meet the thickness of the non-bending area of the glass are used to harden the whole glass, the chemical strengthening time of the bending area of the folding screen glass will be too long and the breakage will occur. In addition, the uneven chemical strengthening layer on the surface of the glass will also cause the bending of the transition part between the to-be-slotted area 101 and the slotted area on the glass sheet. Therefore, in this embodiment, the slotted area on the glass sheet is first coated to protect it, and then the non-slotted area 102 is hardened once, and then the whole is hardened after stripping to ensure the overall strength of the glass sheet and avoid breakage.

[0060] Specifically, first, the bending area on the glass sheet is coated by PVD, in this embodiment, the PVD coating of the bending area on the glass sheet includes coating the slotted area on the system surface of the glass sheet and coating the area corresponding to the slotted area on the user surface of the glass sheet, that is, coating both opposite sides of the bending part on the glass sheet. The coating parameters are as follows: the temperature is 88-92℃, the coating layer material is Al2O3, and the coating layer thickness is 45-55nm. Subsequently, the glass sheet after coating is subjected to first chemical strengthening, and the first chemical strengthening conditions are as follows: the preheating time is 25-35min, the preheating temperature is 270-290℃, the first chemical strengthening time is 115-125min; the first chemical strengthening temperature is 378-382℃; and the consumables are 99-100% NaNO3(WT%) / 0.4-0.6% H2SiO3(WT%). After the first chemical strengthening, the coating layer on the bending area needs to be removed, in this embodiment, the alkaline stripping solution is used to remove the coating layer on the bending area of the glass sheet; the stripping temperature is 115-125℃, the stripping consumables are 48-52% NaOH(WT%), and the stripping time is 8-12min. After stripping, the whole glass sheet is subjected to second chemical strengthening, and the second chemical strengthening conditions are as follows: the preheating time is 29-31min, the preheating temperature is 270-290℃, the second chemical strengthening time is 1-3min; the second chemical strengthening temperature is 378-382℃; and the consumables are 99-100% NaNO3(WT%) / 0.4-0.6% H2SiO3(WT%). The first chemical strengthening is to chemically strengthen all parts of the glass sheet except the coated area, and the second chemical strengthening is to coat the whole glass sheet after stripping.

[0061] It should be noted that in this embodiment, after the glass sheet is secondly hardened in step S6, the bending area on the system surface of the glass sheet is glued to form a glue layer 103, and the thickness of the glue layer 103 is the height difference between the slotted area 101 and the non-slotted area 102. Specifically, by gluing the bending area on the system surface of the glass sheet, the thickness difference between the slotted area and the non-slotted area 102 on the system surface is filled, which improves the appearance of the grinding thinning and folding screen glass and increases the bending times of the grinding thinning and folding screen glass. Preferably, in this embodiment, the bending radius of the bending area of the folding screen electronic device front cover is less than 1.5mm, and the 180° bending life of the bending area is greater than 250000 times. In addition, in this embodiment, after the glass sheet is secondly chemically strengthened, the glass sheet with the removed PVD coating layer is returned to be polished by using a NaOH system.

[0062] The gluing process includes:

[0063] 1) Before dispensing, use a micrometer to measure the thickness of the folding screen glass on the grinder thinning area and the height T of the step difference formed by the non-grinder thinning area, combine the length L and width W of the grinder thinning area, and calculate the volume V1 of the cured UV glue: V1 = L * W * T;

[0064] 2) According to the volume V1 after curing, calculate the volume V0 of the liquid glue before curing: V0 = V1 / X, wherein X represents the content of non-volatile matter;

[0065] 3) Before dispensing, clean the folding screen glass surface to be dispensed to keep it dry and free of oil;

[0066] 4) Select epoxy resin UV curing glue to dispense;

[0067] 5) Use more than V0 of glue to dispense, and the excess glue will overflow from the dam glue 104 around (as shown in Figure 7 ), until the bending area and the non-bending area have no step difference;

[0068] 6) After curing, the folding screen electronic device front cover is obtained. The curing conditions are LED irradiation, wavelength is 365nm, energy is 1500-2000mj / cm 2 , pre-curing time is 6s, and final curing time is 40s.

[0069] It should be noted that in order to improve the quality of the glass sheet, the present embodiment also proposes a large number of assumptions for the current problems of the glass sheet and verifies the results through repeated adjustment, as shown in the following table:

[0070]

[0071] The following describes the preparation process of the folding screen electronic device glass front cover with specific examples.

[0072] 1) Apply protective oil

[0073] For glass material of type 7418, silk screen both sides of the glass material with protective oil to avoid damage to the surface in subsequent processes. Parameters are as follows: consumables use 4500PN acid-resistant protective oil, ink thickness: 15-25um / surface, surface drying: 175-185℃, duration 3mins; final curing: 175-185℃, duration: 30mins, silk screen printing screen uses screen printing screen of type 77T.

[0074] 2) CNC splitting

[0075] For the large size glass with double-sided protective oil, the glass is cut to facilitate subsequent process production. The crack parameters are as follows: the feeding speed is 35000-60000 mm / min, the cutting grinding wheel is diamond grinding wheel; the cutting depth is 0.005~0.01 mm, and the cutting pressure is 1~2 MPa.

[0076] 3) CNC profile and chamfer processing

[0077] The purpose of CNC profile and chamfer processing is to roughly process the profile of the cutting glass to obtain the required profile of the user. The parameters are as follows: the spindle speed is 28000-32000 rpm, the rough cutting feeding speed is 80 mm / min, the fine cutting feeding speed is 130 mm / min, the rough cutting grinding wheel is 400# grinding wheel, and the fine cutting grinding wheel is 800# grinding wheel.

[0078] 4) Polishing glass piece body

[0079] The purpose of polishing glass piece body is to remove the sharp corners or burrs generated during CNC processing of the glass piece, to avoid scratches, broken pieces and other defects in subsequent processes. The device uses an ear machine, and the parameters are as follows: the polishing brush is a pig hair brush, the pig hair length is 15-30 mm, the polishing long side speed is 1750-1850 rpm, and the polishing short side speed is 400-500 rpm.

[0080] 5) Remove protective oil

[0081] It is mainly used to remove the protective oil on the glass piece system surface (grinding machine slot surface) after polishing the glass piece body (when removing oil, both sides of the glass piece will be removed protective oil), otherwise it will affect the precision of the grinding machine thinning and folding screen glass. The parameters of the removal are as follows: the removal temperature is 80-90℃, the removal consumables are 5-8% NaOH (WT%), and the removal time is 8-12 min.

[0082] 6) Silk screen protective oil on the user side of the glass piece

[0083] For the sample with double-sided protective oil removed, the user side of the glass piece is silk screened with protective oil to avoid damage to the surface in subsequent processes. The parameters are as follows: the consumables are 4500PN acid-resistant protective oil, the ink thickness is 15-25 um / edge, the surface drying is 175-185℃ for 3 mins; the final solidification is 175-185℃ for 30 mins, and the silk screen printing screen adopts a screen printing screen with a model of 77T.

[0084] 7) Grinding machine slot thinning

[0085] The grinding machine grooving and thinning method designed in this embodiment only targets the local thinning of the bent part of the folding screen glass. The thickness of the incoming glass sheet is 0.495-0.515mm (including the thickness of the ink on the user side), and the thickness is removed by 0.399-0.401mm. The grinding machine grooving reduces the thickness of the bent part of the folding screen glass to 0.095-0.115mm.

[0086]

[0087] 8) 3D polishing

[0088] The system surface of the sample thinned by the grinding machine was polished with pig bristles to reduce surface scratches and optimize the surface quality of the system. The removal amount in the thinned area of ​​the grinding machine was 0.02-0.03 mm. The equipment used was a Huazhong Power Polishing Machine.

[0089]

[0090] 9) Remove the protective oil from the glass slide system surface.

[0091] After 3D polishing, the protective oil on the glass system surface needs to be removed, otherwise it will affect subsequent processing. The oil removal parameters are as follows: oil removal temperature is 80-90℃, the decoction consumable is 5-8% NaOH (WT%), and the decoction time is 8-12 minutes.

[0092] 10) Carpet polishing

[0093] After removing the protective oil, the sample is carpet polished to remove scratches on the folding screen glass surface or defects such as incomplete polishing and haziness in 3D polishing, further optimizing the surface quality of the system. The thinning amount of the grinding machine is 0-0.005mm, and the equipment used is a 13.7B polishing machine.

[0094]

[0095] 11) NaOH alkaline etching for thinning

[0096] For folding screen glass samples with a grinding thickness of 0.06-0.08mm in the thinned area (grooving area) of the fine-grinding incoming material, the entire glass sheet was etched using a NaOH system to achieve a grinding thickness of 0.03-0.05mm in the thinned area (note: the glass will expand after hardening). The NaOH alkaline etching parameters are as follows: reagent used is 50% NaOH + 5% NaG, etching temperature is 115-125℃, removal amount is 0.03-0.035mm / side; the NaOH etching system uses a vertical chemical treatment system; etching time is 60min; quality control parameters: grinding thinned area thickness <0.05mm.

[0097] 12) PVD coating in thinned areas

[0098] First, the grinding machine thinning area is coated with PVD film, and the coating parameters are as follows: temperature is 88-92℃, coating material is Al2O3, and coating thickness is 45-55nm.

[0099] 13) First chemical strengthening

[0100] After PVD coating is completed, the first chemical strengthening is carried out, and the chemical strengthening conditions are as follows: preheating time is 25-35min, preheating temperature is 270-290℃, first chemical strengthening time is 115-125min; first chemical strengthening temperature is 378-382℃; consumables are 99-100% NaNO3(WT%) / 0.4-0.6% H2SiO3(WT%).

[0101] 14) PVD film removal

[0102] After the first chemical strengthening is completed, PVD removal is carried out, and the removal temperature is 115-125℃, the removal consumables are 48-52% NaOH(WT%), and the removal time is 8-12min. Since Al2O3 is amphoteric, it is calculated that 50% NaOH(WT%) can etch away Al2O3 PVD coating with a thickness of 50nm within 8min at 120℃, and the damage to the glass material mainly composed of SiO2 is small.

[0103] 15) Second chemical strengthening

[0104] The preheating time of the second chemical strengthening is 29-31min, the preheating temperature is 270-290℃, the second chemical strengthening time is 1-3min (hardening suspension time 1min); the second chemical strengthening temperature is 378-382℃; the consumables are 99-100% NaNO3(WT%) / 0.4-0.6% H2SiO3(WT%).

[0105] 16) Polishing

[0106] After the second chemical strengthening is completed, the folded screen glass after the second chemical strengthening needs to be polished to remove the concave-convex points formed on the glass surface during the hardening process, so that the surface roughness is reduced to Sa<1nm. The polishing parameters are as follows: consumables are carpet, polishing equipment is 13B polishing machine, upper / lower disc rotation speed is 5-15rpm / 25-35rpm; batch number is 3PCS / batch; disc pressure is 80-120kg, grinding liquid is white CeO2 grinding liquid, D50=0.6-1um. Among them, the folded screen glass will have a small thickness removal, and the thickness removal amount is basically the same as the folding screen glass hardening expansion.

[0107] 17) Dispensing

[0108] For the step difference formed by the inconsistent thickness of the thinning area of the folding screen glass grinding machine and the non-slotted thinning area, the point gluing method is used to fill it flat, and the scheme is as follows:

[0109] 1) Calculate the solid colloidal glue: Before dispensing, measure the thickness difference H of the folding screen glass grinding machine slotting area which is thinner than the non-slotted area, and then calculate the volume V1 of the UV glue after curing according to the width L of the glass and the width W of the slotting V1=H*L*W;

[0110] 2) Calculate the volume V0 of the liquid glue before curing according to the volume V1 after curing: V0=V1 / X, where X represents the content of non-volatile matter;

[0111] 3) Before dispensing, clean the folding screen glass surface that needs to be dispensed to make it dry and free of grease; then perform plasma cleaning on the slotted area;

[0112] 4) Select epoxy resin UV curing glue to dispense, and the dispensing parameters are as follows:

[0113] A: First dispensing: point dam glue, dam glue nozzle pressure 0.4 MPa, injection speed 22 mm / s, glue dispensing speed 0.002 mL / s, dam glue line width 1.3-1.5 mm, dam glue edge to hole or glass edge distance 0.6-0.8 mm; dam glue pre-curing time 12 s;

[0114] B: Second dispensing: point filling glue, filling glue nozzle pressure 0.1 MPa, needle tube injection speed 25 mm / s, glue dispensing speed 0.004 mL / s, filling glue line width 1.2 mm, filling glue pre-curing time 6 s.

[0115] In order to ensure that the water glue filling is full and there is no glue shortage, the amount of filling glue is set to be 0.5%-1% more than the amount of glue required for filling the slotted area, and the excess filling glue will overflow from both sides of the dam glue and the slotted joint area when the large and small glasses are bonded.

[0116] The folding screen electronic device front cover processing technology of the present application adopts a vacuum adsorption method to position and clamp the glass sheet to be thinned, and a first adsorption area and a second adsorption area corresponding to the glass sheet to-be-slotted area 101 and the non-slotted area 102 are respectively arranged on the adsorption platform 202 of the grinding machine thinning clamp 20, the adsorption hole 203 with a hole diameter less than or equal to 2mm is opened on the first adsorption area, and the air groove 204 with a width greater than the hole diameter of the adsorption hole 203 is opened on the second adsorption area. By tightly adsorbing the glass sheet to be thinned at the second adsorption area through negative pressure to prevent the glass sheet from shifting during processing, the adsorption force in the to-be-slotted area 101 domain is reduced, avoiding the to-be-slotted area 101 on the glass sheet from breaking due to excessive local adsorption force after thinning. It can also play a buffering role when the air pressure fluctuates, avoiding the problem of broken pieces caused by excessive adsorption force fluctuation in the to-be-slotted area 101 domain, reducing the glass breakage rate and the defective rate, and improving the production efficiency of ultra-thin glass. In addition, the combination of grinding machine thinning and NaOH chemical thinning can not only avoid the problem of increased breakage rate of the bending area on the glass due to grinding and thinning to a thickness less than 0.08mm, but also avoid the problem of excessive thinning removal and increased cost caused by etching the entire glass surface with NaOH system alone, thereby reducing the processing cost of ultra-thin glass.

[0117] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0118] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be construed as limiting the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A processing technology for the front cover of a foldable screen electronic device, used to achieve thinning of the bending area of ​​the front cover of the foldable screen electronic device, characterized in that, Includes the following steps: S1. Cut the original glass sheet to obtain a glass sheet to be processed. The glass sheet has a user side facing the user when in use and a system side facing the inside of the electronic device. The system side has a slotted area for forming a bending area and a non-slotted area located next to the slotted area. S2. Prepare a grinding machine thinning fixture. The grinding machine thinning fixture has a vacuum channel for communicating with an external vacuum device. An adsorption platform is formed on the upper surface of the grinding machine thinning fixture. The adsorption platform has a first adsorption area corresponding to the area to be slotted and a second adsorption area corresponding to the area not to be slotted. The first adsorption area has a plurality of adsorption holes communicating with the vacuum channel. The second adsorption area has an air groove communicating with the vacuum channel. The diameter of the adsorption holes is less than or equal to 2 mm. The width of the air groove is greater than the diameter of the adsorption holes. The total amount of air entering the first adsorption area per unit time is less than the total amount of air entering the second adsorption area. S3. Fix the grinding machine thinning fixture on the grinding machine table, and clamp the glass sheet on the grinding machine thinning fixture so that the user side of the glass sheet is in contact with the adsorption platform. The area to be grooved on the glass sheet corresponds to the first adsorption area, and the non-grooved area of ​​the glass sheet corresponds to the second adsorption area. S4. The area to be grooved on the glass slide is mechanically thinned using a grinding wheel on a grinding machine. The grinding wheel includes a wheel body, a through hole for connecting the grinding machine motor shaft is provided in the middle of the wheel body, an annular grinding surface is formed on the annular side of the wheel body, and two opposite sides of the wheel body are raised to form two annular steps coaxial with the through hole. The outer diameter of the annular step is smaller than the diameter of the annular grinding surface, and there is an arc-shaped transition between the annular step and the annular grinding surface. S5. After mechanical thinning, the grooved area is polished. After polishing, the mechanically thinned glass sheet is thinned on both sides using a NaOH etching system, which includes 50% NaOH and 5% NaG. S6. PVD coating is applied to the bent area of ​​the glass sheet, and the coated glass sheet is hardened once. After the coating is removed from the bent area, the glass sheet is hardened a second time to obtain the front cover of the foldable screen electronic device. In step S6, after the glass sheet is hardened a second time, adhesive is applied to the bent area of ​​the glass sheet system surface to form an adhesive layer. The thickness of the adhesive layer is the height difference between the area to be grooved and the area not to be grooved.

2. The processing technology for the front cover of a foldable screen electronic device according to claim 1, characterized in that, After mechanical thinning, the thickness of the bending area is 0.095-0.115mm; after double-sided thinning, the thickness of the bending area is 0.03-0.05mm.

3. The processing technology for the front cover of a foldable screen electronic device according to claim 1, characterized in that, The surface roughness Ra of the upper surface of the adsorption platform is 0.003 mm, and the flatness of the glass sheet after being attached to the adsorption platform is less than 0.01 mm.

4. The processing technology for the front cover of a foldable screen electronic device according to claim 1, characterized in that, The upper surface of the grinding machine thinning fixture is provided with multiple limiting blocks that are spaced apart along the edge of the adsorption platform and arranged along a U-shaped path. The upper surface of the limiting blocks is higher than the upper surface of the adsorption platform, and a gap is formed between adjacent limiting blocks.

5. The processing technology for the front cover of a foldable screen electronic device according to claim 1, characterized in that, A number of adsorption pores are arranged in a square array in the first adsorption zone. The row spacing between the adsorption pores in the first adsorption zone is 5 mm, and the column spacing between the adsorption pores is 6.3 mm.

6. The processing technology for the front cover of a foldable screen electronic device according to claim 1, characterized in that, The lower surface of the grinding machine thinning fixture has a hollow groove at the part corresponding to the first adsorption area. The top surface of the hollow groove has a number of air guide holes that communicate with the vacuum channel. Each air guide hole communicates with two adjacent adsorption holes on the first adsorption area, and a shielding part is formed between two adjacent air guide holes to partially shield the adsorption holes.

7. The processing technology for the front cover of a foldable screen electronic device according to claim 1, characterized in that, The adsorption platform has a guide hole in the second adsorption zone that communicates with the vacuum channel, and the guide hole is connected to the middle of the air groove.

8. The processing technology for the front cover of a foldable screen electronic device according to claim 7, characterized in that, The air groove includes multiple annular guide grooves arranged in concentric circles around the guide hole. Each annular guide groove is sequentially connected and communicates with the guide hole. The annular guide grooves have a square ring structure or a circular ring structure.

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