Vehicle window glass and method of manufacturing the same, vehicle

Abstract

Provided are a vehicle window glass, a manufacturing method thereof, and a vehicle. The vehicle window glass comprises a glass body having at least one surface, and the vehicle window glass is provided with a weakened area, the weakened area comprising a plurality of weakened portions formed on the surface of the glass body and / or inside the glass body by physical abrasion and / or laser impact and / or chemical etching, the plurality of weakened portions being arranged in an array, the weakened area being configured to be able to break after being impacted, and a head injury criterion value HIC within 0-5 ms after being impacted being ≤800. The disclosure sets the weakened area by using different weakening methods on the surface and / or inside of the glass body, pre-introduces defects capable of reducing the strength of the glass and dispersing surface stress, and is capable of triggering the glass body to break in a proper short time when impacted to allow the impact energy to be absorbed, avoiding the problem of late breaking of the glass body and providing a lower HIC value, reducing the risk of serious head injury that may be caused when a pedestrian collides, and improving the safety of pedestrians.

Description

Technical Field

[0001] This disclosure relates to the field of glass technology, and more specifically to a vehicle window glass and a method for manufacturing the same, as well as a vehicle using the same window glass. Background Technology

[0002] With the rapid development of the automotive industry, vehicle safety issues have become increasingly prominent, encompassing not only the protection of occupants inside the vehicle but also the protection of pedestrians outside. On roads, especially in urban areas, a large number of deaths are due to pedestrians being struck by cars. In vehicle-pedestrian collisions, head injuries are the most severe form of fatal injury to pedestrians, caused by the head striking the windshield.

[0003] To assess pedestrian injuries in accidents, current pedestrian protection tests calculate the HIC (Head Injury Criterion) value by conducting crash tests on head models and windshields. The HIC value is a quantitative indicator of the risk of head injury in a collision, quantifying the risk of traumatic brain injury by measuring the deceleration of the head and its duration. A high HIC value equates to high injury to pedestrians, thus requiring a low HIC value to ensure pedestrian safety. To absorb impact energy and achieve a low HIC value, the windshield must break to tighten the adhesive layer (such as PVB) between the two panes of glass, thus absorbing energy smoothly like a safety net. This places high demands on the windshield's breakage conditions to meet the safety criteria of a low HIC value. Summary of the Invention

[0004] The purpose of this disclosure is to propose an improved design for vehicle window glass that weakens the glass in a cost-effective and reliable manner, enabling the glass to break at an appropriate time in the event of an impact to meet a safety index with a low HIC value, thus providing reliable protection for pedestrians.

[0005] Therefore, according to one aspect of this disclosure, a vehicle window glass is provided, the vehicle window glass comprising a glass body having at least one surface, wherein the vehicle window glass is provided with a weakened region, the weakened region comprising a plurality of weakened portions formed on the surface of the glass body and / or formed inside the glass body by physical abrasion and / or laser shock and / or chemical etching, the plurality of weakened portions being arranged in an array, the weakened region being configured to break upon impact, and having a head injury standard value (HIC) ≤ 800 within 0 to 5 ms after impact.

[0006] Based on the above technical concept, the embodiments of this disclosure may further include any one or more of the following optional forms.

[0007] In some alternative forms, the weakened area has a head injury standard value (HIC) ≤ 500 within 0 to 2 ms after impact.

[0008] In some alternative forms, the plurality of weakening parts are arranged in an array with a spacing of less than or equal to 170 mm.

[0009] In some alternative forms, the plurality of weakening parts are arranged in a long strip array.

[0010] In some alternative forms, the plurality of weakening portions are configured as weakening holes having any one of the following cross-sections: triangular, circular groove, or circular.

[0011] In some alternative forms, the weakened hole includes a through hole or a non-through hole.

[0012] In some alternative forms, the plurality of weakened portions are configured as microcracks.

[0013] In some alternative forms, the size and / or shape and / or spacing of the plurality of weakened portions of the weakened region are the same or different.

[0014] In some alternative forms, the maximum size of the plurality of weakened portions is less than or equal to 0.2 mm.

[0015] In some alternative forms, the maximum size of the plurality of weakened portions is 5 μm to 50 μm.

[0016] In some alternative forms, the glass body includes a first glass body and a second glass body arranged in a stacked manner and attached by an adhesive layer, the first glass body having opposing first and second surfaces, the second glass body having a third surface facing the second surface and a fourth surface opposite the third surface, wherein the weakened region includes a plurality of weakened portions formed on the surfaces of the first glass body and / or the second glass body and / or formed in the interior of the first glass body and / or the second glass body by physical abrasion and / or laser shock and / or chemical etching.

[0017] In some alternative forms, the second surface of the first glass body and the fourth surface of the second glass body are set as tin surfaces, the weakening portion is formed on the second surface and / or the fourth surface, and / or the weakening portion extends from the second surface and / or the fourth surface into the interior of the first glass body and / or the second glass body.

[0018] In some alternative forms, the vehicle window glass includes a front windshield, a rear windshield, and side windows, and the weakened area is located in the light-transmitting area of ​​the vehicle window glass.

[0019] In some alternative forms, the window glass includes multiple weakened areas, and the multiple weakened portions of at least two weakened areas have the same or different shapes and / or sizes and / or arrangements.

[0020] In some alternative forms, the window glass includes a plurality of weakened regions, which are arranged continuously or at intervals along the surface direction of the window glass, and / or the plurality of weakened regions overlap or stagger each other along the cross-sectional direction of the window glass.

[0021] According to another aspect of this disclosure, a method for manufacturing the aforementioned vehicle window glass is provided, comprising the steps of: providing a glass body; bending the glass body; forming a vehicle window glass having a weakened region, wherein, before or after bending, a plurality of weakened portions of the weakened region are formed on the surface of the glass body and / or inside the glass body by physical abrasion and / or laser shock and / or chemical etching.

[0022] In some alternative forms, the glass body comprises a first glass body and a second glass body arranged in a stacked manner and attached by an adhesive layer, the method comprising the steps of: providing the first glass body and the second glass body; bending the first glass body and the second glass body; laminating the first glass body and the second glass body to form a window glass having a weakened region, wherein, before or after bending or before or after lamination, a plurality of weakened portions of the weakened region are formed on the surface of the first glass body and / or the second glass body and / or inside the first glass body and / or the second glass body by physical abrasion and / or laser shock and / or chemical etching.

[0023] In some alternative forms, the method includes: forming a plurality of weakened portions on the surface of the first glass body and / or the second glass body and / or inside the first glass body and / or the second glass body before bending the first glass body and the second glass body; bending the first glass body and the second glass body having the weakened portions.

[0024] In some alternative forms, the method includes: laminating the first glass body and the second glass body; and after laminating the first glass body and the second glass body, forming a plurality of weakened portions of the weakened region on the surface of the first glass body and / or the second glass body and / or inside the first glass body and / or the second glass body.

[0025] In some alternative forms, the physical wear is performed by the drill bit in a manual or automatic manner.

[0026] In some alternative forms, the laser shock is performed by a laser through laser ablation, laser modification, or laser filamentation.

[0027] In some alternative forms, the chemical etching is carried out by surface treatment of the glass body with an alkaline solution.

[0028] In some alternative forms, the alkaline solution includes sodium hydroxide, potassium hydroxide, or sodium bicarbonate.

[0029] According to another aspect of this disclosure, a vehicle is provided, the vehicle including the above-described vehicle window glass, wherein the vehicle window glass includes a front windshield, a rear windshield, and side windows.

[0030] The vehicle window glass disclosed herein incorporates weakened areas on the surface and / or interior of the glass body using different weakening methods. This pre-introduces defects that can reduce glass strength and disperse surface stress. Upon impact, the glass body can be triggered to break within a short time to allow for the absorption of impact energy, avoiding the problem of late-stage glass breakage and providing a lower HIC value. This reduces the risk of serious head injuries that may occur during pedestrian collisions and improves pedestrian safety. Attached Figure Description

[0031] Other features and advantages of this disclosure will be better understood through the following detailed description of alternative embodiments in conjunction with the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic diagram illustrating the relationship between head deceleration and time after a simulated impact to the windshield.

[0033] Figure 2 This is a plan view of a vehicle window glass according to one embodiment of the present disclosure, showing a weakened area including multiple weakened portions;

[0034] Figure 3 This is a schematic diagram showing the relationship between the HIC value and the time to breakage for different types of vehicle window glass;

[0035] Figure 4 This is a schematic flowchart of a method for manufacturing vehicle window glass according to one embodiment of the present disclosure;

[0036] Figure 5 This is a process diagram illustrating a method for manufacturing vehicle window glass according to one embodiment of the present disclosure;

[0037] Figure 6 This is a process diagram illustrating a method for manufacturing vehicle window glass according to another embodiment of the present disclosure;

[0038] Figure 7 This is a schematic diagram of forming a weakened portion on a glass body using a laser according to one embodiment of the present disclosure;

[0039] Figure 8This is a schematic diagram of forming a weakened portion on a glass body by means of a laser according to another embodiment of the present disclosure;

[0040] Figure 9 This is a schematic diagram showing the relationship between alkaline solutions of different concentrations and the rate of decrease in glass fiber diameter;

[0041] Figure 10 This is a schematic diagram showing the relationship between potassium hydroxide solutions at different temperatures and the decrease in glass fiber diameter over different time periods;

[0042] Figure 11 This is a schematic diagram showing the relationship between sodium hydroxide solutions of different concentrations and the decrease in glass fiber diameter at different times. Detailed Implementation

[0043] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of particular ways of implementing and using this disclosure, and are not intended to limit the scope of this disclosure.

[0044] In this document, the expressions “including” or similar expressions such as “having” are open-ended and do not exclude additional unlisted components or functions.

[0045] In this document, the terms “first”, “second”, etc., are not used to specify the order of events or the number of components, unless otherwise stated.

[0046] In this article, "multiple" means two or more, unless otherwise explicitly specified.

[0047] In this document, unless otherwise explicitly specified, terms such as "connection" and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0048] In this article, the "surface" of a car window glass or glass body refers to the surface with the largest surface area among all the faces of the car window glass or glass body, and the "edge" refers to the surface of the car window glass or glass body defined by its thickness. The "section" of a car window glass or glass body is a section taken along the thickness direction of the car window glass or glass body, and the "section direction" is the direction perpendicular to the surface of the car window glass or glass body or the normal direction of the surface of the car window glass or glass body.

[0049] It should be understood that the term "vehicle" as used herein includes fuel cell vehicles, hybrid vehicles, electric vehicles, hydrogen-powered vehicles, etc., and can refer to various vehicle models without limitation. The vehicle window glass described according to embodiments of this disclosure is exemplified by the windshield; however, the vehicle window glass of this disclosure includes, but is not limited to, the windshield, rear windshield, and side window glass (door glass, or corner window glass in some cases). When describing directions, "outer" and "inner" refer to directions relative to the vehicle body; "outer" refers to the direction away from the vehicle body, and "inner" refers to the direction facing the vehicle body.

[0050] In the various embodiments described, unless otherwise specified, the thickness of the glass body is the thickness commonly used in the art and is not limited to that shown in the figures. Furthermore, although the figures show flat glass, the glass of this disclosure can also be curved glass. In the various embodiments, each is described as a separate glass body; however, in some cases not described, the surface of the glass body may also be coated with special coatings to improve thermal insulation and / or other properties such as comfort.

[0051] It is recognized that head injuries in car collisions are one of the leading causes of disability and even death. To ensure adequate safety performance of vehicle windows, several standardization bodies have set a series of requirements for the HIC (Highly Indicative of Safety) value of vehicle windows. For example, according to ISO 3537, the HIC value of the windshield and side windows should be less than 1000, and the HIC value of the rear windshield should be less than 700. By assessing and limiting the HIC value of vehicle windows, injuries to pedestrians in collisions can be mitigated. Automakers and research institutions are committed to developing new materials and structures to further improve the safety performance of vehicle windows, such as using stronger and more flexible materials, increasing glass thickness, and improving structural design. However, current methods have drawbacks, including high cost, complex implementation, and relatively low safety reliability. Therefore, how to obtain vehicle windows that meet HIC value requirements in a cost-effective and reliable manner remains a pressing issue.

[0052] The inventors discovered that during an impact, the main problems encountered by car windows are non-breakage and late-breakage. If a car window does not break after an impact, for example, if there is only an impact defect on the glass surface, the HIC value will inevitably be greater than 1000. However, if the car window breaks late after an impact, that is, after reaching a certain time threshold, it may also cause serious injury to pedestrians due to a large HIC value. Figure 1This diagram illustrates the relationship between head deceleration and time after a simulated impact to the windshield. The horizontal axis represents the time elapsed after the pedestrian collides with the windshield in milliseconds (ms), and the vertical axis represents the deceleration of the pedestrian's head in grams (g). Curve A shows the late-stage breakage scenario, where the calculated HIC value for glass breaking 5 ms after impact is greater than 800. Curve B, on the other hand, shows the early-stage breakage scenario, where the HIC value for glass breaking 1 ms after impact is greater than 200. This HIC value is significantly lower than that for glass breaking after 5 ms, implying that earlier breakage is better, thus reducing pedestrian injury in collisions.

[0053] Based on this, and according to the concept of this disclosure, by providing weakened areas on the surface and / or inside the glass of the vehicle window, defects that can reduce glass strength and disperse surface stress are introduced in advance, thus solving the problem of potential late-stage breakage of the vehicle window. This allows the vehicle window to trigger glass breakage within a reasonably short time upon impact, meeting the safety index of low HIC value and providing reliable protection for pedestrians. It should be understood that, based on different application environments and actual needs, the vehicle window of this disclosure covers both single-layer glass and laminated glass with multiple layers.

[0054] Combination Figure 2 An exemplary embodiment of a vehicle window glass according to this disclosure is shown, comprising a glass body 10 having at least one surface, wherein the vehicle window glass is provided with a weakening region C, the weakening region C comprising a plurality of weakening portions 20 formed on the surface of the glass body 10 and / or formed inside the glass body 10 by physical abrasion and / or laser shock and / or chemical etching. When applied to a windshield, the vehicle window glass is a laminated glass, the glass body of the vehicle window glass comprising a first glass body and a second glass body (e.g., laminated glass body) arranged in layers and attached by an adhesive layer. Figure 5 and Figure 6 The diagram shows a first glass body 11 and a second glass body 12, wherein the first glass body has opposing first and second surfaces, and the second glass body has a third surface facing the second surface and a fourth surface opposite the third surface. The first glass body 11 faces the exterior of the vehicle (may be referred to as the outer glass), and the first surface correspondingly faces the exterior of the vehicle; the second glass body 12 faces the interior of the vehicle (may be referred to as the inner glass), and the fourth surface correspondingly faces the interior of the vehicle. The weakened regions include multiple weakened portions formed on the surfaces of the first and / or second glass bodies and / or formed within the first and / or second glass bodies by physical abrasion and / or laser shock and / or chemical etching. As an example, the adhesive layer is, for example, a polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), optically clear adhesive (OCA), or other adhesive layers suitable for laminated glass.

[0055] Advantageously, multiple weakened sections are arranged in an array, and the weakened region C is constructed to be able to break upon impact, with a head injury standard value (HIC) ≤ 800 within 0 to 5 ms after impact. It is generally desirable that the glass breaks in less than 15 ms after impact, and the design of the weakened region C implies that the surface of the glass breaks completely within a short time, including the sequential breakage of the surfaces of the first and second glass sections, with a low HIC value at the time of breakage.

[0056] In this way, the mechanical strength of the window glass is reduced by a pre-introduced weakened area. By designing the weakened area and / or the weakened part of the weakened area, as well as the size and / or geometry and / or arrangement of the weakened part, it is possible to effectively and reliably ensure that the window glass breaks at a specific location within a short desired time during an impact. This allows for the absorption of impact energy, provides a lower HIC value, reduces the risk of serious head injuries to pedestrians during collisions, and provides more reliable safety protection for pedestrians.

[0057] For the weakened area, the desired outcome is that the weakened portion is small or hidden without causing defects that affect the appearance, while meeting a low HIC value. In some methods, such as for vehicle windows with a black border shielding area 30 near the edge, the weakened area is placed within the black border shielding area. In the vehicle window of this disclosure, the weakened area C is preferably located in the light-transmitting area of ​​the window glass to cover the area that a pedestrian may come into contact with during an impact, ensuring better safety for pedestrians, while meeting the low HIC value requirement and not affecting the appearance.

[0058] Figure 2 An exemplary illustration shows the distribution of multiple weakening portions 20 in the weakened region C. Advantageously, the multiple weakening portions 20 are arranged in an array with a spacing D of 170 mm or less, such as 160 mm or less, 150 mm or less, 140 mm or less, etc. This array encompasses arrays of various shapes such as rectangles and squares, and it should be understood that the spacing D between adjacent weakening portions can be set to be the same or different according to different needs, but overall, the weakened region still presents multiple weakening portions in the form of an array of dots. Preferably, the multiple weakening portions can be arranged in a long strip array to facilitate the easier diffusion of impact energy along the long side direction upon impact, rapidly forming a large-scale diffusion crack to disperse surface stress.

[0059] Alternatively, the weakening part 20 can be configured as a weakening hole with any of the following cross-sections: triangular, circular groove, or circular. Figure 2The illustrated weakening hole is a circular cross-section. Regarding the degree of rapid fracture, the weakening hole with a triangular cross-section fractures more severely than the weakening hole with a circular groove cross-section, which in turn fractures more severely than the weakening hole with a circular cross-section. It should be understood that although multiple weakening portions in the weakened region advantageously adopt the same form, such as having the same cross-section, in the illustrated embodiments and practical applications, it is not excluded that in some applications, multiple weakening portions in the weakened region may also have different cross-sectional forms.

[0060] also, Figure 2 An exemplary illustration shows a weakened region C. In some embodiments, the vehicle window glass may include multiple weakened regions, wherein the multiple weakened regions are arranged continuously or at intervals along the surface direction of the vehicle window glass, or the multiple weakened regions overlap or stagger each other along the cross-sectional direction of the vehicle window glass, for example, including partial overlap and complete overlap, or partial stagger and complete stagger. When multiple weakened regions are present, the weakened portions of at least two weakened regions may be the same or different in terms of shape and / or size and / or arrangement to meet different needs.

[0061] For weakened portions in the form of weakened holes, the weakened holes can include through holes or non-through holes. In some embodiments, the weakened portion can also be constructed as a microcrack. Depending on the different formation methods of the weakened portion, the maximum size of the weakened portion may vary, but it is advantageously less than or equal to 0.2 mm to avoid visual defects that would affect the overall appearance due to excessive size, while also meeting the required early fracture conditions and low HIC value. For example, for Figure 2 For the weakened hole shown, the maximum size of the weakened portion can be the diameter d of the hole, and this diameter d is less than or equal to 0.2 mm. For non-through holes, the maximum size of the weakened portion can also include the depth of the hole, and this depth is less than or equal to 0.2 mm. For the weakened portion in the form of a microcrack, the maximum size of the weakened portion can be the size of the microcrack in the direction perpendicular to its extension direction, also known as the crack width, and this crack width can be from 5 μm to 50 μm, for example 5 μm, 10 μm, 15 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc., and any value within the interval of any two values ​​listed above as endpoints.

[0062] Regardless of the form of the weakening element used, the design of the weakened area enables the window glass to break prematurely upon impact, and the head injury standard value (HIC) within 0 to 5 ms after impact is ≤800, for example, less than or equal to 700, 650, 600, etc. Particularly advantageously, in some preferred embodiments, the head injury standard value (HIC) of the weakened area within 0 to 2 ms after impact is ≤500.

[0063] Figure 3This diagram illustrates the relationship between HIC values ​​and fracture time for different types of automotive window glass. Taking a laminated windshield as an example, the first and second glass bodies forming the window glass are, for example, float glass. Float glass has an air surface and a tin surface during its manufacturing process. In the diagram, T represents the tin surface, A represents the air surface, and TATA means that the first surface of the first glass body is tin, the second surface is air, the third surface of the second glass body is tin, and the fourth surface is air. Similarly, ATAT means that the first surface of the first glass body is air, the second surface is tin, the third surface of the second glass body is air, and the fourth surface is tin. For the tin surface, experimental data shows that the fracture strength of float glass with a thickness of, for example, 5 mm, on the tin surface is 120 ± 15 MPa, which is about 25% higher than that on the air surface. Therefore, setting the weakening area on the tin surface is more conducive to the early fracture of the glass. The inventors have verified that ATAT type car window glass and ATAT type car window glass with weakened areas can have a smaller HIC value, achieving a head injury standard value of HIC≤500 within 0 to 2 ms after impact.

[0064] Specifically, see Figure 3 The diagram uses dashed boxes to distinguish between ATAT and TATA type car windows. For the same type of window, colored dots indicate the breakage of the first layer of glass, typically the fourth surface, while blank dots indicate the breakage of the second layer, typically the second surface. The diagram shows that for TATA type windows, those with weakened areas have a lower HIC value and a shorter breakage time compared to those without. Similarly, for ATAT type windows, those with weakened areas also have a lower HIC value and a shorter breakage time compared to those without. Furthermore, compared to TATA-type automotive window glass with weakened areas, ATAT-type automotive window glass, whether with or without weakened areas, exhibits lower HIC values ​​and shorter breakage times. The standard HIC value for head injury within the 0-2 ms timeframe is ≤500. For example, HIC values ​​within timeframes of 1.8 ms, 1.3 ms, 1 ms, and 0.5 ms are less than or equal to 500, 480, 460, 430, 400, 380, 350, 300, 270, 250, and 200, respectively. It should be understood that breakage time and HIC values ​​can include any value within the interval specified by any two of the examples listed above.

[0065] Based on the above verification, in embodiments where the second surface of the first glass body and the fourth surface of the second glass body are tin-faced, the weakening portion can be formed on the second surface and / or the fourth surface, and / or the weakening portion can extend from the second surface and / or the fourth surface into the interior of the first glass body and / or the second glass body. This effectively ensures that, upon impact, the first and second glass bodies of the vehicle window break sequentially within a short period of time.

[0066] It should be understood that, depending on the specific needs, the weakening portion can be located on any surface of the window glass and / or can extend from any surface into the corresponding glass body. In addition to achieving lower HIC values ​​and shorter breakage times, placing the weakening area on the second and / or fourth surfaces (e.g., ATAT type window glass) can yield other additional beneficial effects. For example, from an optical perspective, weakening portions formed inside the laminated glass (such as on the second surface) are filled by the adhesive layer during the lamination process, thus preventing visual defects that affect the overall appearance. Furthermore, from a manufacturing process perspective, weakening portions formed inside the laminated glass (such as on the second surface) can avoid contamination problems.

[0067] To obtain a weakened part that meets the above requirements, combined with Figure 4 This disclosure also provides a method for manufacturing the aforementioned vehicle window glass, which generally includes the following steps:

[0068] S1 provides the vitreous body;

[0069] S2, bend the glass body;

[0070] S3 forms a window glass with a weakened area.

[0071] Advantageously, before or after bending, multiple weakened portions of the weakened region are formed on the surface of the glass body and / or inside the glass body by physical abrasion and / or laser shock and / or chemical etching.

[0072] When applied to laminated glass, step S1 may include providing a first glass body and a second glass body, step S2 may include bending the first glass body and the second glass body, and step S3 may include laminating the first glass body and the second glass body to form a window glass with a weakened region, wherein, before or after bending or before or after lamination, a plurality of weakened portions of the weakened region are formed on the surface of the first glass body and / or the second glass body and / or inside the first glass body and / or the second glass body by physical abrasion and / or laser shock and / or chemical etching.

[0073] Figure 5 and Figure 6Examples of embodiments are shown, namely, forming the weakened portion before bending and forming the weakened portion after lamination.

[0074] First see Figure 5 In step S1, a first glass body 11 and a second glass body 12 can be provided. In this embodiment, bending the first glass body and the second glass body in step S2 may specifically include:

[0075] S21, before bending the first glass body 11 and the second glass body 12, a plurality of weakening portions 20 are formed on the surface of the first glass body 11 and / or the second glass body 12 and / or inside the first glass body 11 and / or the second glass body 12 to form a weakening region.

[0076] S22, bending the first and second glass bodies with weakened regions.

[0077] Subsequently, in step S3, the first glass body 11 and the second glass body 12 are laminated to form a car window glass with a weakened area. In short, in this embodiment, the weakened part can be formed on the glass body first, and then the bending and lamination processes of the two glass bodies can be performed. This method is easy to form the weakened part on the glass body, simple to operate, and low in cost.

[0078] Compared to Figure 5 The embodiment shown, Figure 6 In step S1, a first glass body 11 and a second glass body 12 can still be provided, and in step S2, the first glass body 11 and the second glass body 12 are bent. In this embodiment, the lamination of the first glass body and the second glass body in step S3 to form a window glass with a weakened area may specifically include:

[0079] S31, laminate the first glass body 11 and the second glass body 12;

[0080] S32, after laminating the first glass body 11 and the second glass body 12, a plurality of weakening portions 20 of the weakening region are formed on the surface of the first glass body 11 and / or the second glass body 12 and / or inside the first glass body 11 and / or the second glass body 12.

[0081] In short, in this embodiment, two layers of glass can be bent and laminated first, and then a weakening part can be formed on the surface of one or two layers of glass and / or inside one or two layers of glass. This method can avoid the possibility of glass breakage during the formation of the weakening part.

[0082] As described above, the formation of weakened portions on the surface and / or inside the glass body can be achieved through physical abrasion and / or laser shock and / or chemical etching. Specifically, combined with Figure 7 and Figure 8As shown, laser shock can be performed by laser 40 through laser ablation, laser modification, or laser filamentation. Laser shock on the glass body (first glass body 11 and / or second glass body 12) can instantly vaporize or melt the surface of the glass body using a high-energy laser beam in a non-contact manner, causing ablation or localized modification of the glass without material loss. It can form micro-sized weakened portions 20 (weakening holes or microcracks) without physical contact. The characteristics of laser shock avoid problems such as stress concentration and surface damage, and it is environmentally friendly and pollution-free. Depending on different needs, weakening holes 20 can be formed on the surface of the glass body to reduce the impact on the mechanical properties of the glass body, such as... Figure 7 As shown, it can also be formed inside the glass to avoid affecting the optical properties of the glass, such as... Figure 8 As shown.

[0083] The laser 40 can be any suitable laser that meets the requirements of the weakened portion of this disclosure, such as a femtosecond, picosecond, or nanosecond laser with a wavelength of 355nm, 532nm, or 1064nm and a power of 1W to 50W, which can form a weakened portion with a size of about 5μm to 50μm on or inside the glass body.

[0084] Physical abrasion can be performed manually or automatically using a drill. For example, in a manual manner, a drill gun (grinding gun) can be manually fixed to the surface of the glass, applying 200N of pressure and holding it there for 3 seconds, thereby creating a weakened hole with a diameter of, for example, 0.2mm or less. It should be understood that, depending on the specific needs, different sizes of drill guns can be selected to perform physical abrasion to obtain weakened holes of different diameters. Compared to laser impact methods, using a drill to physically abrade the weakened area is less costly.

[0085] In some embodiments, the weakened portion is formed by chemical etching, specifically by surface treatment of the glass surface with an alkaline solution. Alternatively, the alkaline solution may include sodium hydroxide (NaOH), potassium hydroxide (KOH), or sodium bicarbonate (NaHCO3). The alkaline solution achieves etching by breaking the silicon-oxygen bonds (Si-O-Si) on the glass surface to form soluble silicates. Experiments have shown that in chemical etching of the glass surface with an alkaline solution, the solution concentration and temperature are significantly correlated with the etching rate or efficiency for forming etching defects (weakened portions).

[0086] Combination Figures 9 to 11 As shown, where Figure 9 This is a schematic diagram showing the relationship between alkaline solutions of different concentrations and the rate of decrease in glass fiber diameter. Figure 10 This is a schematic diagram showing the relationship between potassium hydroxide solutions at different temperatures and the decrease in glass fiber diameter over different time periods. Figure 11This diagram illustrates the relationship between sodium hydroxide solutions of different concentrations and the reduction in glass fiber diameter over different time periods. As shown in the figure, taking alkaline solution concentrations from 0.5 mol / L to 3 mol / L as examples, both potassium hydroxide and sodium hydroxide solutions exhibit a positive correlation between the etching rate (i.e., the reduction rate in glass fiber diameter, μm / hour) and the alkaline solution concentration (mol / L), but the increase is not entirely linear. Too low a concentration results in slow etching, while too high a concentration may lead to over-etching. Under the same concentration conditions, sodium hydroxide solution has a higher etching efficiency. For example, for potassium hydroxide solution, ... Figure 10 As shown, the etching rate increases approximately linearly with increasing temperature. For the same processing time, the etching rate increases by more than 30% for every 5°C increase in temperature. For example, with sodium hydroxide solution, such as... Figure 11 As shown, the etching rate increases approximately linearly with increasing concentration. For the same processing time, the etching rate increases by approximately 10% to 30% for every 0.5 mol / L increase in concentration.

[0087] Compared to laser shock or physical abrasion, chemical etching using an alkaline solution to form weakened areas is relatively cheaper. Furthermore, chemical etching avoids mechanical contact, eliminating the risk of stress concentration and reducing glass breakage. In some embodiments, the weakened area is formed by directly spraying an alkaline solution onto the glass body, for example... Figure 5 As shown, the residual heat of the glass after bending helps to increase the reaction kinetics, that is, it can accelerate the reaction of OH ions with the silicon-oxygen bonds on the glass surface and increase the etching rate.

[0088] Regardless of the weakening method used, this disclosure aims to provide weakened areas on the surface and / or inside the glass of a vehicle window in a cost-effective and reliable manner, so that the glass can be triggered to break within a short time after an impact to meet the safety index of low HIC value and provide reliable protection for pedestrians.

[0089] The technical content and features of this disclosure have been disclosed above. However, it is understood that those skilled in the art can make various changes and improvements to the above-disclosed concept under the inventive concept of this disclosure, but all such changes and improvements fall within the protection scope of this disclosure. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of this disclosure is determined by the claims.

Claims

1. A vehicle glazing, characterised in that, The vehicle window glass includes a glass body having at least one surface, wherein the vehicle window glass is provided with a weakened region, the weakened region including a plurality of weakened portions formed on the surface of the glass body and / or formed inside the glass body by physical abrasion and / or laser shock and / or chemical etching, the plurality of weakened portions being arranged in an array, the weakened region being configured to break upon impact, and having a head injury standard value (HIC) ≤ 800 within 0 to 5 ms after impact.

2. The vehicle window glass according to claim 1, characterized in that, The weakened area has a head injury standard value (HIC) of ≤500 within 0 to 2 ms after impact.

3. The vehicle window glass according to claim 1, characterized in that, The plurality of weakened parts are arranged in an array with a spacing of less than or equal to 170 mm.

4. The vehicle window glass according to claim 3, characterized in that, The multiple weakening parts are arranged in a long strip array.

5. The vehicle window glass according to claim 1, characterized in that, The plurality of weakening parts are configured as weakening holes having any one of the following cross-sections: triangular, circular groove, or circular.

6. The vehicle window glass according to claim 5, characterized in that, The weakened hole includes a through hole or a non-through hole.

7. The vehicle window glass according to claim 1, characterized in that, The multiple weakened parts are constructed into microcracks.

8. The vehicle window glass according to claim 1, characterized in that, The size and / or shape and / or spacing of the multiple weakened parts in the weakened region are the same or different.

9. The vehicle window glass according to claim 1, characterized in that, The maximum size of the plurality of weakened parts is less than or equal to 0.2 mm.

10. The vehicle window glass according to claim 9, characterized in that, The maximum size of the plurality of weakened portions is 5 μm to 50 μm.

11. The vehicle window glass according to any one of claims 1 to 10, characterized in that, The glass body includes a first glass body and a second glass body stacked together and attached by an adhesive layer. The first glass body has a first surface and a second surface opposite to each other. The second glass body has a third surface facing the second surface and a fourth surface opposite to the third surface. The weakened region includes a plurality of weakened portions formed on the surfaces of the first glass body and / or the second glass body and / or formed inside the first glass body and / or the second glass body by physical abrasion and / or laser shock and / or chemical etching.

12. The vehicle window glass according to claim 11, characterized in that, The second surface of the first glass body and the fourth surface of the second glass body are set as tin surfaces, the weakening portion is formed on the second surface and / or the fourth surface, and / or the weakening portion extends from the second surface and / or the fourth surface into the interior of the first glass body and / or the second glass body.

13. The vehicle window glass according to claim 11, characterized in that, The vehicle window glass includes a front windshield, a rear windshield, and side windows, and the weakened area is located in the light-transmitting area of ​​the vehicle window glass.

14. The vehicle window glass according to any one of claims 1 to 10, characterized in that, The vehicle window glass includes multiple weakened areas, and the shape and / or size and / or arrangement of the multiple weakened parts in at least two weakened areas are the same or different.

15. The vehicle window glass according to any one of claims 1 to 10, characterized in that, The vehicle window glass includes multiple weakened areas, which are arranged continuously or at intervals along the surface direction of the vehicle window glass, and / or the multiple weakened areas overlap or stagger each other along the cross-sectional direction of the vehicle window glass.

16. A method for manufacturing vehicle window glass according to any one of claims 1 to 15, characterized in that, Includes the following steps: Provide vitreous body; The glass body is bent; Forming car window glass with weakened areas, Among them, before or after bending, multiple weakened portions of the weakened region are formed on the surface of the glass body and / or inside the glass body by physical abrasion and / or laser shock and / or chemical etching.

17. The method according to claim 16, characterized in that, The glass body comprises a first glass body and a second glass body arranged in layers and attached by an adhesive layer, and the method includes the following steps: Provide a first vitreous body and a second vitreous body; Bending the first and second glass bodies; The first glass body and the second glass body are laminated to form a window glass with a weakened area. Specifically, before or after bending, or before or after lamination, multiple weakened portions of the weakened region are formed on the surface of the first glass body and / or the second glass body and / or inside the first glass body and / or the second glass body by physical abrasion and / or laser shock and / or chemical etching.

18. The method according to claim 17, characterized in that, The method includes: Before bending the first glass body and the second glass body, a plurality of weakening portions are formed on the surface of the first glass body and / or the second glass body and / or inside the first glass body and / or the second glass body; The first and second vitreous bodies with weakened regions are bent.

19. The method according to claim 17, characterized in that, The method includes: The first glass body and the second glass body are laminated; After laminating the first glass body and the second glass body, a plurality of weakened portions are formed on the surface of the first glass body and / or the second glass body and / or inside the first glass body and / or the second glass body.

20. The method according to claim 16 or 17, characterized in that, The physical wear is caused by the drill bit, either manually or automatically.

21. The method according to claim 16 or 17, characterized in that, The laser shock is performed by a laser through laser ablation, laser modification, or laser filamentation.

22. The method according to claim 16 or 17, characterized in that, The chemical etching is performed by surface treatment of the glass body using an alkaline solution.

23. The method according to claim 22, characterized in that, The alkaline solution includes sodium hydroxide, potassium hydroxide, or sodium bicarbonate.

24. A vehicle, characterized in that, The vehicle includes window glass according to any one of claims 1 to 15, wherein the window glass includes a front windshield, a rear windshield, and side windows.

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