Vehicle window glass, preparation method thereof and vehicle

Abstract

The invention provides vehicle window glass, a preparation method thereof and a vehicle. The vehicle window glass comprises a first glass plate, a middle layer and a second glass plate, the middle layer is connected between the first glass plate and the second glass plate, and the vehicle window glass comprises a first area and a second area. The first area is connected to the periphery of the second area in a surrounding mode. The maximum tensile stress of the vehicle window glass in the first area is smaller than or equal to 7 MPa, and the component force of the surface pressure stress of the vehicle window glass in the second area in the width direction of the vehicle window glass is smaller than or equal to 11 MPa. The component force of the surface compressive stress of the vehicle window glass in the second area in the length direction of the vehicle window glass is smaller than or equal to 7 MPa, and the plane tensile stress of the vehicle window glass in the second area is smaller than or equal to 3 MPa. According to the technical scheme, pedestrian protection can be improved, and the pedestrian protection requirement is met.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a window glass, a method for its preparation, and a vehicle. Background Technology

[0002] As vehicle windows become more multifunctional and complex in design, people have increasingly stringent requirements regarding surface variations, optical performance, and pedestrian protection. However, while current manufacturing processes for vehicle windows can largely meet surface and optical requirements, they do not fully satisfy the pedestrian protection requirements. Summary of the Invention

[0003] The embodiments of this application provide a vehicle window glass and its manufacturing method, as well as a vehicle, which can improve the protection of pedestrians and meet pedestrian protection requirements.

[0004] In a first aspect, this application provides a vehicle window glass, the vehicle window glass including a first glass panel, an intermediate layer and a second glass panel, the intermediate layer being connected between the first glass panel and the second glass panel;

[0005] The vehicle window glass includes a first region and a second region. The first region surrounds and connects to the periphery of the second region. The maximum tensile stress of the vehicle window glass in the first region is less than or equal to 7 MPa. The component of the surface compressive stress of the vehicle window glass in the second region in the width direction is less than or equal to 11 MPa. The component of the surface compressive stress of the vehicle window glass in the second region in the length direction is less than or equal to 7 MPa. The planar tensile stress of the vehicle window glass in the second region is less than or equal to 3 MPa.

[0006] Understandably, as automotive windows become more multifunctional and complex in design, the requirements for their surface irregularities and optical performance are becoming increasingly stringent. However, traditional gravity-forming methods can no longer meet these requirements, necessitating the use of compression molding technology. Currently, the compression molding process for automotive windows primarily utilizes heat-strengthened molding. While existing heat-strengthened molding processes can meet the surface and optical requirements of automotive windows, they do not fully comply with pedestrian protection regulations, especially given the ever-increasing demands for pedestrian protection.

[0007] Therefore, the embodiments of this application use an improved thermal strengthening process to prepare vehicle window glass, which reduces the edge tensile stress (i.e., the tensile stress in the first region), surface compressive stress, and planar tensile stress of the prepared vehicle window glass. As a result, during a pedestrian impact, the vehicle window glass has no stress support around it and is easily broken after the impact, thereby achieving the purpose of improving pedestrian protection and significantly improving pedestrian safety.

[0008] In one possible implementation, the first region includes a first edge and a second edge, the first edge being disposed around the outside of the second edge and spaced apart from the second edge, the first edge forming the outer edge of the vehicle window glass, and the distance between the second edge and the first edge being in the range of 100mm to 150mm.

[0009] In one possible implementation, the head injury index (HIC) values ​​of both the first and second regions are less than or equal to 650.

[0010] In one possible implementation, both the first glass plate and the second glass plate are heat-strengthened glass plates.

[0011] In one possible implementation, both the first glass plate and the second glass plate are processed using a single-piece pressing molding process.

[0012] Secondly, this application also provides a method for preparing vehicle window glass, the method comprising:

[0013] Step 1: Provide a first glass plate and a second glass plate, and heat the first glass plate and the second glass plate;

[0014] Step 2: The heated first glass plate and the second glass plate are respectively hot-bent into shape;

[0015] Step 3: Anneal and cool the first and second glass plates after hot bending.

[0016] Step 4: Insert an intermediate layer between the first glass plate and the second glass plate to obtain a car window glass, wherein the car window glass includes a first region and a second region, the first region surrounds and connects to the periphery of the second region, the maximum tensile stress of the car window glass in the first region is less than or equal to 7 MPa, the component of the surface compressive stress of the car window glass in the second region in the width direction of the car window glass is less than or equal to 11 MPa, the component of the surface compressive stress of the car window glass in the second region in the length direction of the car window glass is less than or equal to 7 MPa, and the planar tensile stress of the car window glass in the second region is less than or equal to 3 MPa.

[0017] In one possible implementation, step 1 further includes:

[0018] Step 11: Provide the first glass plate and the second glass plate in the shape of a flat plate;

[0019] Step 12: Heat the first glass plate and the second glass plate in the heating furnace to above the softening point temperature, and then remove the heated first glass plate and the second glass plate from the heating furnace.

[0020] In one possible implementation, in step 12, the first glass plate and the second glass plate are heated to above 620°C in a heating furnace by convection or radiation heating.

[0021] In one possible implementation, in step 2, a forming mold is used to hot-bend the first glass plate or the second glass plate respectively. The forming mold includes a punch and a die, the punch is located above the die, and the punch and the die cooperate to press the first glass plate or the second glass plate.

[0022] In one possible implementation, during the process of pressing the first glass plate or the second glass plate together with the convex mold body and the concave mold body, the first glass plate or the second glass plate is simultaneously heated by the concave mold body.

[0023] In one possible implementation, the die body includes a body, the body including a first surface, a second surface and an inner surface, the first surface facing the punch body, the second surface facing away from the punch body, and the inner surface located inside the body and connected between the first surface and the second surface;

[0024] The die further includes a plurality of heating elements, and a plurality of heating elements are respectively provided on one side of the second surface of the body and on one side of the inner surface of the body;

[0025] In step 2, the plurality of heating elements are turned on to heat the body, so that the first glass plate or the second glass plate is heated by the heat from the plurality of heating elements and / or the body.

[0026] In one possible implementation, in step 2, the first glass plate or the second glass plate is heated to 550°C-600°C by the heat from the plurality of heating elements and / or the body.

[0027] In one possible implementation, the mold body includes a body, the body further including a first body and a second body, the first body being vertically and vertically mounted inside the second body;

[0028] Step 2 also includes:

[0029] Step 21: The first body is higher than the second body, so that the first glass plate or the second glass plate is placed on the first body;

[0030] Step 22: The first body is lower than the second body, so that the first glass plate or the second glass plate is placed on the second body;

[0031] Step 23: The punch and the second body cooperate to press and form the first glass plate or the second glass plate.

[0032] In one possible implementation, the gap between the first body and the second body is 10mm-20mm.

[0033] In one possible implementation, step 3 further includes:

[0034] Step 31: Move the curved first glass plate or the second glass plate from the forming mold into the annealing zone, wherein the annealing zone is located outside the heating furnace;

[0035] Step 32: Heat and anneal the curved first glass plate or the second glass plate in the annealing zone;

[0036] Step 33: Cool the curved first glass plate or the second glass plate to room temperature.

[0037] In one possible implementation, in step 32, the annealing temperature is set to 400℃-530℃, and the annealing time is greater than or equal to 400 seconds.

[0038] In one possible implementation, step 3 further includes:

[0039] Step 31: Provide an annealing ring, wherein the annealing ring is located outside the molding area of ​​the molding die;

[0040] Step 32: Using the annealing ring, transport the curved first glass plate or the second glass plate to the annealing zone for annealing, while simultaneously heating the curved first glass plate or the second glass plate through the annealing ring during transport; and

[0041] Step 33: Cool the curved first glass plate and the second glass plate to room temperature.

[0042] In one possible implementation, the annealing time in step 32 is greater than 20 seconds.

[0043] In one possible implementation, the annealing ring includes a membrane and multiple heating modules;

[0044] Step 32 also includes:

[0045] The first glass plate or the second glass plate is placed above the membrane fabric, wherein the first glass plate or the second glass plate and the plurality of heating modules are respectively located on the upper and lower sides of the membrane fabric; and

[0046] The plurality of heating modules are turned on to heat the membrane fabric, so that the first glass plate or the second glass plate is heated by the heat of the membrane fabric.

[0047] Thirdly, this application also provides a vehicle window glass, which is prepared using the vehicle window glass preparation method described above.

[0048] Fourthly, this application also provides a vehicle that includes the window glass described above. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0050] Figure 2 This is a schematic diagram of a vehicle window glass provided in an embodiment of this application;

[0051] Figure 3 This is a schematic diagram showing the distribution of measurement points when measuring stress on a car window.

[0052] Figure 4 This is a schematic flowchart of a method for preparing vehicle window glass provided in an embodiment of this application;

[0053] Figure 5 This is a schematic diagram of one state of the forming mold in step 2;

[0054] Figure 6 This is a cross-sectional schematic diagram of the first and second glass plates being connected to the mold body in step 2.

[0055] Figure 7 This is a schematic diagram of an annealing ring provided in an embodiment of this application.

[0056] Figure label:

[0057] Vehicle 200, Body sheet metal 210, Window glass 100, First area 110, Second area 120, First edge 111, Second edge 112, First side 113, Second side 114, Third side 115, Fourth side 116, Measurement position 1, Measurement position 2, Measurement position 3, Measurement position 4, Measurement position 5, Measurement position 6, Measurement position 7, Measurement position 8, Measurement position 9, Measurement position 10, Measurement position 11, Measurement position 12, Measurement Measurement position 13, measurement position 14, measurement position 15, measurement position 16, measurement position a, measurement position b, measurement position c, measurement position d, measurement position e, measurement position f, measurement position g, measurement position h, measurement position i, forming mold 300, punch body 310, die body 320, body 321, heating element 322, first surface 321a, second surface 321b, inner surface 321c, support element 323, annealing ring 400, heating module 410. Detailed Implementation

[0058] For ease of understanding, the terminology used in the embodiments of this application will be explained first.

[0059] And / or: This is simply a way of describing the relationship between related objects. It indicates that there can be three kinds of relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0060] Multiple: refers to two or more.

[0061] Connection: should be interpreted broadly. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through an intermediary.

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] The embodiments of this application provide a vehicle window glass, a method for preparing the vehicle window glass, and a vehicle.

[0064] Understandably, as automotive windows become more multifunctional and complex in design, the requirements for their surface irregularities and optical performance are becoming increasingly stringent. However, traditional gravity-forming methods can no longer meet these requirements, necessitating the use of compression molding technology. Currently, the compression molding process for automotive windows primarily utilizes heat-strengthened molding. While existing heat-strengthened molding processes can meet the surface and optical requirements of automotive windows, they do not fully comply with pedestrian protection regulations, especially given the ever-increasing demands for pedestrian protection.

[0065] Please see Figure 1 , Figure 1 This is a schematic diagram of a vehicle 200 provided in an embodiment of this application. The vehicle 200 may include a body sheet 210 and a window glass 100. The window glass 100 is mounted on the body sheet 210. The window glass 100 may be one or more of the following: a windshield, a rear windshield, a sunroof, a side window, and a corner window.

[0066] The following explanation will use the windshield of vehicle 200 as an example, with window glass 100 being the windshield of vehicle 200, but it should be understood that this is not the only explanation.

[0067] It should be noted that, Figure 1 The purpose of this illustration is solely to depict the connection between the vehicle window glass 100 and the body sheet metal 210, and is not to specifically limit the connection positions, specific structures, or quantities of each component. In other embodiments of this application, the vehicle 200 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0068] Please see Figure 2 , Figure 2 This is a schematic diagram of a structure of a vehicle window glass 100 provided in an embodiment of this application.

[0069] For ease of description, the length direction of the window glass 100 is defined as the X direction, the width direction as the Y direction, and the thickness direction as the Z direction. The X, Y, and Z directions are all perpendicular to each other.

[0070] The vehicle window glass 100 may include a first glass panel (not shown), an intermediate layer (not shown), and a second glass panel (not shown). The first glass panel, intermediate layer, and second glass panel are sequentially stacked in the thickness direction (Z direction shown in the figure) of the vehicle window glass 100. The intermediate layer connects the first glass panel and the second glass panel. The first glass panel is located closer to the exterior of the vehicle 200. The second glass panel is located closer to the interior of the vehicle 200. Both the first and second glass panels can be heat-strengthened glass panels. Furthermore, both the first and second glass panels can be processed using a single-piece pressing process.

[0071] The window glass 100 may also include a first area 110 ( Figure 2 (shaded area in) and second area 120 ( Figure 2 (The area surrounded by shadow). The first area 110 surrounds and connects to the periphery of the second area 120.

[0072] The first region 110 may include a first edge 111 and a second edge 112. The first edge 111 is disposed around the outside of the second edge 112 and spaced apart from the second edge 112. The first edge 111 also forms the outer edge of the window glass 100. The outer edge of the window glass 100 is the edge surrounding the central axis of the window glass 100. The central axis of the window glass 100 extends along the thickness direction of the window glass 100. The second edge 112 is the junction of the first region 110 and the second region 120. That is, the first edge 111 is the outer edge of the first region 110, and the second edge 112 is the inner edge of the first region 110. The shortest distance between the second edge 112 and the first edge 111 is in the range of 100mm to 150mm (inclusive of the endpoint values ​​of 100mm and 150mm). For example, the shortest distance between the second edge 112 and the first edge 111 can be 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, 135mm, 140mm, 145mm, or 150mm, etc. Preferably, the shortest distance between the second edge 112 and the first edge 111 can be 110mm-140mm (including the endpoint values ​​of 110mm and 140mm). Alternatively, the shortest distance between the second edge 112 and the first edge 111 can be 120mm-140mm (including the endpoint values ​​of 120mm and 140mm). Alternatively, the shortest distance between the second edge 112 and the first edge 111 can be 130mm-145mm (including the endpoint values ​​of 130mm and 145mm).

[0073] The first region 110 may further include a first side portion 113, a second side portion 114, a third side portion 115, and a fourth side portion 116. Along the circumferential direction of the first region 110, i.e., along the extension direction of the first edge 111 or the second edge 112, the first side portion 113, the third side portion 115, the second side portion 114, and the fourth side portion 116 are connected sequentially. The first side portion 113 and the second side portion 114 are positioned opposite each other in the width direction (Y direction in the figure) of the window glass 100 and both extend along the length direction of the window glass 100. The first side portion 113 is closer to the sunroof glass than the second side portion 114. The third side portion 115 and the fourth side portion 116 are positioned opposite each other in the length direction (X direction in the figure) of the window glass 100 and both extend along the width direction of the window glass 100.

[0074] In the embodiments of this application, the maximum tensile stress (i.e., the maximum edge tensile stress) of the window glass 100 in the first region 110 is less than or equal to 7 MPa. The component of the surface compressive stress of the window glass 100 in the width direction (Y direction in the figure) in the second region 120 is less than or equal to 11 MPa. The component of the surface compressive stress of the window glass 100 in the length direction (X direction in the figure) in the second region 120 is less than or equal to 7 MPa. The planar tensile stress of the window glass 100 in the second region 120 is less than or equal to 3 MPa.

[0075] The Head Injury Criterion (HIC) values ​​of both the first region 110 and the second region 120 of the vehicle window glass 100 are less than or equal to 650. That is, the head injury index of the entire vehicle window glass 100 is less than or equal to 650. The HIC value is an important indicator for assessing the risk of head injury to pedestrians in a vehicle collision. The lower the HIC value, the less injury the vehicle window glass 100 will cause to pedestrians during a collision.

[0076] The embodiments of this application also provide an embodiment and a comparative example 1 to further investigate the tensile stress, compressive stress and HIC value of the vehicle window glass 100 in the embodiments of this application.

[0077] Example 1:

[0078] Example 1 describes a vehicle window glass 100 prepared using an improved thermally strengthened molding process as described in the embodiments of this application (for specific improvements, please refer to the description of the preparation method of the vehicle window glass 100 below). The vehicle window glass 100 provided in Example 1 includes the first region 110 and the second region 120 mentioned above. The first region 110 includes the first side portion 113, the second side portion 114, the third side portion 115, and the fourth side portion 116 mentioned above.

[0079] Comparative Example 1:

[0080] Comparative Example 1 is a vehicle window glass 100 prepared by a conventional heat-strengthened molding process in the prior art. The specific structure of the vehicle window glass 100 provided in Comparative Example 1 can be generally referred to in the relevant description of the vehicle window glass 100 in Example 1, and will not be repeated here.

[0081] This application measured the edge compressive stress, edge tensile stress, surface compressive stress, planar tensile stress, and HIC value at multiple locations of the vehicle window glass 100 in Example 1 and Comparative Example 1, and recorded the measurement results in Tables 1-4 below.

[0082] Wherein, edge compressive stress refers to the compressive stress measured within the first region 110. Edge tensile stress refers to the tensile stress measured within the first region 110. Surface compressive stress refers to the compressive stress measured within the second region 120. Planar tensile stress refers to the tensile stress measured within the second region 120. HIC value refers to the HIC value measured within the first region 110 and the second region 120. The units of stress in Tables 1-3 are all MPa. For example, an edge stress meter and a head model impact test can be used to measure stress and HIC values.

[0083] First, Table 1 records the measured values ​​of the edge compressive stress and edge tensile stress of the vehicle window glass 100 in Example 1 and the edge compressive stress and edge tensile stress of the vehicle window glass 100 in Comparative Example 1.

[0084] Please see Figure 3 , Figure 3 This is a schematic diagram showing the distribution of measurement points when measuring stress on a car window glass 100. Among them, Figure 3 This is merely to demonstrate the location of the measurement point selected when measuring the stress of the car window glass 100, and is not intended to specify the connection positions or specific structure of the various components of the car window glass 100.

[0085] In Example 1, a total of sixteen measurement positions were selected to measure the edge compressive stress and edge tensile stress of the vehicle window glass 100. Specifically, five measurement positions were selected on the first side 113 of the vehicle window glass 100, namely measurement position 1, measurement position 2, measurement position 3, measurement position 4, and measurement position 5. These five measurement positions are located at six equal division points of the first side 113. Five measurement positions were also selected on the second side 114, namely measurement position 6, measurement position 7, measurement position 8, measurement position 9, and measurement position 10. These five measurement positions are located at six equal division points of the second side 114. Three measurement positions were selected on the third side 115, namely measurement position 11, measurement position 12, and measurement position 13. These three measurement positions are located at four equal division points of the third side 115. Three measurement positions were also selected on the fourth side 116, namely measurement position 14, measurement position 15, and measurement position 16. These three measurement positions are located at the four equal division points of the fourth side 116.

[0086] In Comparative Example 1, sixteen measurement points were also selected to measure the edge compressive stress and edge tensile stress of the vehicle window glass 100. The specific locations of the measurement points are the same as those selected in Example 1, and will not be repeated here.

[0087] The values ​​of edge compressive stress and edge tensile stress measured at sixteen measurement positions in Example 1, and the values ​​of edge compressive stress and edge tensile stress measured at sixteen measurement positions in Comparative Example 1 are recorded in Table 1.

[0088] Table 1: Comparison of edge compressive stress and edge tensile stress of the vehicle window glass 100 in Example 1 and Comparative Example 1

[0089]

[0090] As can be seen from Table 1, the maximum edge tensile stress of the vehicle window glass 100 in Embodiment 1 is less than or equal to 7 MPa. That is, the maximum tensile stress of the vehicle window glass 100 in the first region 110 in the embodiments of this application is less than or equal to 7 MPa.

[0091] Furthermore, at any of the sixteen measurement positions, compared to the window glass 100 in Comparative Example 1, the edge compressive stress and edge tensile stress of the window glass 100 in Example 1 were reduced. This indicates that the window glass 100 in Example 1 is more likely to break during a collision, thus protecting pedestrians.

[0092] Secondly, Table 2 records the measured values ​​of the surface compressive stress of the vehicle window glass 100 in Example 1 and the measured values ​​of the surface compressive stress of the vehicle window glass 100 in Comparative Example 1.

[0093] Please refer to the following: Figure 2 and Figure 3In Example 1, a total of nine measurement positions were selected to measure the surface compressive stress of the vehicle window glass 100. Specifically, three measurement positions were selected in the second region 120 of the vehicle window glass 100 near the third side 115, namely measurement position a, measurement position b, and measurement position c, collectively referred to as the three left-side measurement positions. Three measurement positions were selected in the central region of the second region 120, namely measurement position d, measurement position e, and measurement position f, collectively referred to as the three central measurement positions. Three measurement positions were also selected in the second region 120 near the fourth side 116, namely measurement position g, measurement position h, and measurement position i, collectively referred to as the three right-side measurement positions.

[0094] In Comparative Example 1, nine measurement points were also selected to measure the surface compressive stress of the vehicle window glass 100. The specific locations of the measurement points are the same as those selected in Example 1, and will not be repeated here.

[0095] Here, the selected measurement location refers to a region. For example, surface compressive stress is measured within a rectangular region.

[0096] The components of the surface compressive stress at each measurement point in Example 1 along the width direction of the window glass 100, the components of the surface compressive stress at each measurement point in Example 1 along the length direction of the window glass 100, the components of the surface compressive stress at each measurement point in Comparative Example 1 along the width direction of the window glass 100, and the components of the surface compressive stress at each measurement point in Comparative Example 1 along the length direction of the window glass 100 are all recorded in Table 1. In Table 2, the letters in parentheses represent the positions of the measurement points.

[0097] Table 2: Comparison of surface compressive stress of vehicle window glass 100 in Example 1 and Comparative Example 1

[0098]

[0099] As can be seen from Table 2, the component of the surface compressive stress of the vehicle window glass 100 in Embodiment 1 in the width direction is less than or equal to 11 MPa. The component of the surface compressive stress of the vehicle window glass 100 in the length direction is less than or equal to 7 MPa. That is, in the embodiments of this application, the component of the surface compressive stress of the vehicle window glass 100 in the second region 120 in the width direction of the vehicle 200 is less than or equal to 11 MPa, and the component in the length direction of the vehicle 200 is less than or equal to 7 MPa.

[0100] Furthermore, at any of the nine measurement positions, compared to the window glass 100 in Comparative Example 1, the surface compressive stress of the window glass 100 in Example 1 is reduced in both the width direction and the length direction. This indicates that the window glass 100 in Example 1 is more likely to break during a collision, thus increasing the protection for pedestrians.

[0101] Next, Table 3 records the measured values ​​of the planar tensile stress of the vehicle window glass 100 in Example 1 and the measured values ​​of the planar tensile stress of the vehicle window glass 100 in Comparative Example 1. The letters in parentheses in Table 3 represent the locations of the measurement points.

[0102] Table 3: Comparison of planar tensile stress of the vehicle window glass 100 in Example 1 and Comparative Example 1

[0103]

[0104] As can be seen from Table 3, the planar tensile stress of the vehicle window glass 100 in Embodiment 1 is less than or equal to 3 MPa. That is, the planar tensile stress of the vehicle window glass 100 in the second region 120 in the embodiments of this application is less than or equal to 3 MPa.

[0105] Furthermore, at any of the nine measurement positions, the planar tensile stress of the window glass 100 in Example 1 was reduced compared to that in Comparative Example 1. This indicates that the window glass 100 in Example 1 is more likely to break during a collision, thus increasing the protection for pedestrians.

[0106] Subsequently, the HIC values ​​of the vehicle window glass 100 in Example 1 and the vehicle window glass 100 in Comparative Example 1 are recorded in Table 4. Table 4 shows the HIC values ​​measured over the entire area of ​​the vehicle window glass 100.

[0107] Table 4: Comparison of HIC values ​​of the vehicle window glass 100 in Example 1 and Comparative Example 1

[0108]

[0109] As can be seen from Table 3, the HIC values ​​of the vehicle window glass 100 in Embodiment 1 are all less than 650. That is, the HIC values ​​of the first region 110 and the second region 120 of the vehicle window glass 100 in the embodiments of this application are both less than 650. In other words, the HIC value of the entire vehicle window glass 100 is less than 650.

[0110] Furthermore, compared to the window glass 100 in Comparative Example 1, the HIC value of the window glass 100 in Example 1 is lower, which indicates that the window glass 100 in Example 1 reduces the harm to pedestrians during a collision.

[0111] In summary, compared with the vehicle window glass 100 prepared by the heat-strengthened molding process in the prior art, the vehicle window glass 100 prepared by the improved heat-strengthened molding process in the embodiments of this application has reduced both compressive and tensile stress. This means that the vehicle window glass 100 provided by the embodiments of this application is more likely to break in the event of a collision, thus providing better protection for pedestrians.

[0112] The embodiments of this application also provide Comparative Example 2, which summarizes and compares the performance parameters of Comparative Example 2 with those of Embodiment 1 described above, in order to further explore the overall performance of the vehicle window glass 100 in the embodiments of this application. Please refer to Table 5 below for details.

[0113] Table 5: Performance comparison of the vehicle window glass 100 in Example 1 and Comparative Examples 1 and 2

[0114]

[0115] As shown in Table 5, in Comparative Example 1, the surface compressive stress of the vehicle window glass 100 is between 10MPa and 20MPa, the maximum edge tensile stress is less than or equal to 12MPa, the proportion of HIC values ​​less than 1000 is about 70%, and the proportion of values ​​less than 650 is about 30%. This indicates that although the vehicle window glass 100 prepared by the existing thermal strengthening molding process can meet the surface and optical requirements, it cannot fully meet the pedestrian protection regulations. In Example 1, the edge tensile stress, surface compressive stress, and planar tensile stress of the vehicle window glass 100 prepared using the improved thermal strengthening molding process are all reduced, indicating that this vehicle window glass 100 is more easily broken and more likely to meet the pedestrian protection requirements.

[0116] Furthermore, in Comparative Example 1, the area with an HIC value less than 650 in the vehicle window glass 100 prepared using a conventional heat-strengthening molding process accounts for only about 30%. However, in the embodiment of this application, the area with an HIC value less than 650 in the vehicle window glass 100 prepared using a heat-strengthening molding process accounts for 100%, meaning the entire area of ​​the vehicle window glass 100 has an HIC value less than 650. This indicates that the vehicle window glass 100 prepared in the embodiment of this application has better energy absorption and buffering capabilities when subjected to high-speed impact from a blunt object, reducing the injury to people from severe collisions and thus protecting pedestrians.

[0117] In summary, the vehicle window glass 100 prepared in the embodiments of this application not only meets the requirements for shape and optics, but also reduces the surface compressive stress, edge tensile stress, and planar tensile stress of the vehicle window glass 100. This means that during a pedestrian impact, the vehicle window glass 100 has no stress support around its perimeter, making it easily shatter upon impact, thus meeting pedestrian protection requirements and providing higher safety for pedestrians. Furthermore, in the embodiments of this application, the head injury index of the entire vehicle window glass 100 is less than 650, further reducing the injury to pedestrians caused by the vehicle window glass 100 during a collision.

[0118] Embodiments of this application also provide a method for preparing a vehicle window glass 100, thereby obtaining the vehicle window glass 100. For details regarding the structure of the vehicle window glass 100, please refer to... Figures 1-4 The aforementioned description will not be repeated here. Furthermore, any additional descriptions of the structure of the window glass 100 below, unless otherwise specified, are applicable to the window glass 100 described above.

[0119] Please see Figure 4 , Figure 4 This is a schematic flowchart of a method for preparing the vehicle window glass 100 provided in an embodiment of this application.

[0120] The method for preparing the vehicle window glass 100 may include at least steps 1, 2, 3 and 4, which are described in detail below.

[0121] Step 1: Provide a first glass plate and a second glass plate, and heat the first glass plate and the second glass plate.

[0122] Step 2: The heated first and second glass plates are hot-bent into shape respectively.

[0123] Step 3: Anneal and cool the first and second glass plates after hot bending.

[0124] Step 4: Insert an intermediate layer between the first and second glass plates to form the vehicle window glass 100. The vehicle window glass 100 may include a first region 110 and a second region 120. The first region 110 surrounds and connects to the periphery of the second region 120. The maximum tensile stress of the vehicle window glass 100 in the first region 110 is less than or equal to 7 MPa. The component of the surface compressive stress of the vehicle window glass 100 in the width direction in the second region 120 is less than or equal to 11 MPa, and the component of the surface compressive stress of the vehicle window glass 100 in the length direction in the second region 120 is less than or equal to 7 MPa. The planar tensile stress of the vehicle window glass 100 in the second region 120 is less than or equal to 3 MPa.

[0125] The following section will provide a further description of each step.

[0126] First, let's describe step 1 above.

[0127] Step 1: Provide a first glass plate and a second glass plate, and heat the first glass plate and the second glass plate.

[0128] Step 1 may include at least steps 11 and 12, which are described in detail below.

[0129] Step 11: Provide a flat first glass plate and a second glass plate.

[0130] Step 12: Heat the first glass plate and the second glass plate in the heating furnace to above the softening point temperature, and then remove the heated first glass plate and the second glass plate from the heating furnace.

[0131] Specifically, the first and second glass plates are conveyed into a heating furnace via roller conveyors. Inside the furnace, the first and second glass plates are heated to above 621°C using convection or radiation heating, bringing them to a high-temperature softened state to facilitate subsequent pressing and molding processes.

[0132] Next, let's describe step 2 above.

[0133] Step 2: The heated first and second glass plates are hot-bent into shape respectively.

[0134] Please refer to the following: Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of one state of the forming mold 300 in step 2. Figure 6 This is a cross-sectional schematic diagram showing the first and second glass plates connected to the mold body 320 in step 2. Figure 5 In this structure, the structure between the concave mold body 320 and the convex mold body 310 is a partial structure of either the first glass plate or the second glass plate. Figure 6 In the middle, the structure placed on the concave mold body 320 is a partial structure of any one of the first glass plate and the second glass plate.

[0135] In step 2, a forming mold 300 can be used to hot-bend the first glass plate or the second glass plate, respectively. The forming mold 300 may include a punch 310 and a die 320. The punch 310 is located above the die 320. The die 320 and the punch 310 can be vertically connected to facilitate moving the first and second glass plates between the die 320 and the punch 310. The punch 310 and the die 320 can cooperate to press and shape the first or second glass plate.

[0136] like Figure 6 As shown, the die body 320 may include a body 321 and a plurality of heating elements 322. The body 321 may include a first surface 321a, a second surface 321b, and an inner surface 321c. The first surface 321a faces the punch 310. The second surface 321b faces away from the punch 310. The inner surface 321c is located inside the body 321 and connects between the first surface 321a and the second surface 321b. A plurality of heating elements 322 are respectively provided on one side of the second surface 321b and one side of the inner surface 321c of the body 321. Further, the die body 320 may also include a support member 323. The support member 323 is connected to the second surface 321b and divides the second surface 321b into a portion of the surface located inside the die body 320 and another portion of the surface located outside the die body 320. At this time, the plurality of heating elements 322 disposed on the second surface 321b can be located inside the die body 320 or outside the die body 320, without restriction.

[0137] The process of hot bending the first glass plate or the second glass plate using the forming mold 300 can include at least the following steps.

[0138] Step 1: The first glass plate and the second glass plate are sandwiched between the punch body 310 and the die body 320.

[0139] The first and second glass plates are fixedly sandwiched between the first surface 321a of the punch body 310 and the die body 320. At this time, the first and second glass plates are spaced apart from the plurality of heating elements 322 of the die body 320. Specifically, the first and second glass plates are spaced apart from the heating elements 322 connected to the second surface 321b of the body 321, and also spaced apart from the heating elements 322 connected to the inner surface 321c. For example, the shortest distance between the first and second glass plates and the heating elements 322 connected to the inner surface 321c can be set in the range of 5mm-10mm.

[0140] Step 2: Press the first glass plate and the second glass plate using the punch body 310 and the die body 320, while simultaneously heating the first glass plate or the second glass plate using the die body 320.

[0141] That is, during the process of pressing the first glass plate or the second glass plate together with the convex mold body 310 and the concave mold body 320, the concave mold body 320 can be used to heat the first glass plate or the second glass plate at the same time.

[0142] The process of heating the first glass plate or the second glass plate using the concave mold 320 may include at least the following steps:

[0143] Multiple heating elements 322 are activated to heat the body 321, so that the first glass plate or the second glass plate is heated by the heat from the multiple heating elements 322 and / or the body 321. The first glass plate and the second glass plate can be heated to 550°C-600°C (inclusive of the endpoint values ​​of 550°C and 600°C) by the heat from the multiple heating elements and / or the body.

[0144] It is understandable that in the mold cavity 320, the heating element 322 disposed on the inner surface 321c can directly heat the first and second glass plates by emitting heat during heating. However, the heating element 322 disposed on the second surface 321b of the body 321 is positioned between the body 321 and the first and second glass plates. Therefore, the heat emitted by the heating element 322 on the second surface 321b of the body 321 first heats the body 321, and then the heated body 321 heats the first and second glass plates.

[0145] In traditional pressing processes, the contact positions between the glass and the die are not uniform. Typically, the middle area of ​​the glass contacts the middle part of the die first, followed by the edge of the glass. This can easily lead to a temperature difference between the glass edge and the middle area, as well as a temperature difference between the glass and the die. Specifically, the edges of the glass cool faster than the middle area, resulting in compressive stress at the edges while the tensile stress in the middle area is difficult to release effectively, leading to excessive tensile stress in the middle area.

[0146] In the embodiments of this application, heating elements 322 are provided on both the edge and the inner surface 321c of the die body 320 to heat the first glass plate and the second glass plate during the pressing process. This can reduce the temperature difference between the first glass plate and the second glass plate throughout the molding process, thereby effectively reducing the edge compressive stress and planar tensile stress of the first glass plate and the second glass plate.

[0147] Optionally, in step 2, the body 321 of the concave mold 320 may further include a first body and a second body. The first body can be vertically mounted inside the second body. The first body can be an inner forming ring with a width of 5mm-8mm (including the endpoint values ​​of 5mm and 8mm). The second body can be the portion of the concave mold 320 that mates with the convex mold 310, and this portion can be annular. The width of the second body can be 25mm-35mm (including the endpoint values ​​of 25mm and 35mm). The width of the portion of the second body that contacts the first and second glass plates can be 10mm-15mm (including the endpoint values ​​of 10mm and 15mm). The gap between the first and second bodies can be 10mm-20mm (including the endpoint values ​​of 10mm and 20mm). It is understood that because the temperature of the body 321 is lower than the temperature of each glass plate (the temperature after exiting the furnace), stress can be generated in each glass plate in the first region 110 (within 100-150mm of the glass edge).

[0148] Based on this, step 2 may also include the following steps:

[0149] Step 21: The first body is higher than the second body, so that the first glass plate or the second glass plate is placed on the first body.

[0150] Step 22: The first body is lower than the second body, so that the first glass plate or the second glass plate is placed on the second body.

[0151] Step 23: The punch and the second body cooperate to press and shape the first glass plate or the second glass plate.

[0152] Next, let's describe step 3 above.

[0153] Step 3: Anneal and cool the first and second glass plates after hot bending.

[0154] This application provides two methods for annealing and cooling a first and second glass plate after hot bending, referred to as Method 1 and Method 2. Method 1 involves annealing and cooling the first and second glass plates in an annealing zone outside a heating furnace. Method 2 involves annealing and cooling the first and second glass plates outside the forming area of ​​a forming mold.

[0155] First, let's describe Method 1.

[0156] When using Method 1 for annealing and cooling, step 3 may include at least steps 31, 32 and 33, which are described in detail below.

[0157] Step 31: Move the curved first or second glass plate from the forming mold 300 into the annealing zone, wherein the annealing zone is located outside the heating furnace.

[0158] Step 32: Heat and anneal the curved first or second glass plate in the annealing zone. The annealing temperature is set to 400℃-530℃ (inclusive of the endpoints 400℃ and 530℃), and the annealing time is greater than or equal to 400 seconds.

[0159] Step 33: Cool the curved first or second glass plate to room temperature.

[0160] The second method will be described next:

[0161] Please see Figure 7 , Figure 7 This is a schematic diagram of an annealing ring 400 provided in an embodiment of this application.

[0162] When using Method 2 for annealing and cooling, step 3 may include at least steps 31, 32 and 33, as detailed below.

[0163] Step 31: Provide an annealing ring, wherein the annealing ring is located outside the molding area of ​​the molding die 300.

[0164] Among them, such as Figure 7 As shown, the annealing ring 400 may include a membrane fabric (not shown) and multiple heating modules 410. The membrane fabric is disposed entirely inside the annealing ring 400. Exemplarily, the membrane fabric may be a metal membrane fabric. The multiple heating modules 410 are located on the same side of the membrane fabric, such as below the membrane fabric.

[0165] The annealing ring 400 is heated by radiating heat generated by the heating module 410 onto the membrane cloth, thereby achieving more uniform heating through the membrane cloth.

[0166] Step 32: Use an annealing ring to transport the curved first glass plate or the second glass plate to the annealing zone for annealing, and heat the curved first glass plate or the second glass plate through the annealing ring during the transport process.

[0167] The process of using the annealing ring 400 to transport the first and second glass plates to the annealing zone for annealing is roughly as follows: the punch 310 lifts the pressed first and second glass plates using vacuum control. At this time, the annealing ring 400 moves directly below the punch 310, the vacuum in the punch 310 is released, and the first and second glass plates fall onto the annealing ring 400. Then, the annealing ring 400 is used to transport the first and second glass plates to the annealing zone, and the upper and lower fans are turned on for annealing. The annealing time is greater than 20 seconds. In addition, during the process of using the annealing ring 400 to transport the first and second glass plates, the membrane cloth on the annealing ring 400 and multiple heating modules 410 continuously heat the first and second glass plates.

[0168] Step 32 may include at least the following steps:

[0169] Step 1: Place the first glass plate and the second glass plate on top of the membrane fabric. The first glass plate or the second glass plate and the multiple heating modules 410 are located on the upper and lower sides of the membrane fabric, respectively.

[0170] Step 2: Turn on multiple heating modules 410 to heat the membrane cloth so that the first glass plate or the second glass plate is heated by the heat of the membrane cloth.

[0171] Specifically, multiple heating modules 410 are turned on, and the heat generated by the heating modules 410 is radiated onto the membrane cloth, thereby heating the first glass plate and the second glass plate through the membrane cloth.

[0172] Understandably, compared to directly heating the first and second glass plates using multiple spaced heating modules 410, heating the entire first and second glass plates with a single sheet of membrane fabric allows for more uniform heating. Furthermore, during the transport of the first and second glass plates to the annealing zone using the annealing ring 400, airflow can cause uneven cooling on their surfaces, leading to temperature changes and differences, and potentially excessive tensile stress. By incorporating a membrane fabric on the annealing ring 400, continuous heating of the first and second glass plates during transport can be achieved, effectively preventing uneven cooling caused by airflow and thus avoiding excessive tensile stress due to large temperature differences.

[0173] Step 33: Cool the curved first and second glass plates to room temperature.

[0174] In summary, the embodiments of this application improve the mold tooling used in the heat-strengthened molding process (specifically, heating elements 322 are provided on the edge and inner surface 321c of the concave mold body 320, and a film cloth and multiple heating modules 410 are provided on the annealing ring 400), and adopt the improved mold tooling in the preparation process of the vehicle window glass 100. This effectively reduces the temperature difference of the vehicle window glass 100 during the molding and annealing processes, resulting in a significant reduction in edge tensile stress, edge compressive stress, planar tensile stress, and surface compressive stress of the prepared vehicle window glass 100. Consequently, during pedestrian impact, there is no longer excessive stress support around the vehicle window glass 100, making it easier to break, which meets the relevant requirements for pedestrian protection.

[0175] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A vehicle glazing, characterised in that, The vehicle window glass comprises a first glass sheet, an intermediate layer, and a second glass sheet, the intermediate layer being connected between the first glass sheet and the second glass sheet; The vehicle window glass comprises a first region and a second region, the first region surrounding a periphery connected to the second region, a maximum tensile stress of the vehicle window glass in the first region being less than or equal to 7 MPa, a component of a surface compressive stress of the vehicle window glass in the second region in a width direction of the vehicle window glass being less than or equal to 11 MPa, a component of the surface compressive stress of the vehicle window glass in the second region in a length direction of the vehicle window glass being less than or equal to 7 MPa, and a plane tensile stress of the vehicle window glass in the second region being less than or equal to 3 MPa.

2. The vehicle glazing of claim 1, wherein, The first region comprises a first edge and a second edge, the first edge being arranged outside the second edge and being spaced apart from the second edge, the first edge forming an outer edge of the vehicle window glass, and a distance between the first edge and the second edge being in a range of 100 mm to 150 mm.

3. The glazing according to claim 1 or 2, characterized in that, A head injury criterion (HIC) value of the first region and the second region is less than or equal to 650.

4. The glazing of claim 1, wherein, The first glass sheet and the second glass sheet are both heat strengthened glass sheets.

5. The glazing according to claim 4, wherein, The first glass sheet and the second glass sheet are both processed by a single-press forming process.

6. A method of making a vehicle glazing, characterised by, The method comprises: Step 1, providing a first glass sheet and a second glass sheet, and heating the first glass sheet and the second glass sheet; Step 2, heat bending the heated first glass sheet and the heated second glass sheet, respectively; Step 3, annealing and cooling the heat-bent first glass sheet and the heat-bent second glass sheet; Step 4, inserting an intermediate layer between the first glass sheet and the second glass sheet to obtain a vehicle window glass, wherein the vehicle window glass comprises a first region and a second region, the first region surrounding a periphery connected to the second region, a maximum tensile stress of the vehicle window glass in the first region being less than or equal to 7 MPa, a component of a surface compressive stress of the vehicle window glass in the second region in a width direction of the vehicle window glass being less than or equal to 11 MPa, a component of the surface compressive stress of the vehicle window glass in the second region in a length direction of the vehicle window glass being less than or equal to 7 MPa, and a plane tensile stress of the vehicle window glass in the second region being less than or equal to 3 MPa.

7. The method of claim 6, wherein, Step 1 further comprises: Step 11, providing the first glass sheet and the second glass sheet in a flat plate shape; Step 12, heating the first glass sheet and the second glass sheet to above a softening point temperature in a heating furnace, and moving the heated first glass sheet and the heated second glass sheet out of the heating furnace.

8. The method of claim 7, wherein, In step 12, the first glass sheet and the second glass sheet are heated to above 620 ℃ in the heating furnace by convection or radiation heating.

9. The method of claim 6, wherein, In step 2, the first glass plate or the second glass plate is subjected to hot bending forming by using a forming die, wherein the forming die comprises a male die body and a female die body, the male die body is located above the female die body, and the male die body and the female die body cooperate to press-form the first glass plate or the second glass plate.

10. The method of claim 9, wherein, In the process of press-forming the first glass plate or the second glass plate by cooperating the male die body and the female die body, the female die body is used to heat the first glass plate or the second glass plate at the same time.

11. The method of claim 10, wherein, The female die body comprises a body, the body comprises a first surface, a second surface and an inner surface, the first surface faces the male die body, the second surface faces away from the male die body, and the inner surface is located inside the body and connected between the first surface and the second surface. The female die further comprises a plurality of heating elements, one side of the second surface of the body and one side of the inner surface of the body are respectively provided with a plurality of heating elements. In step 2, the plurality of heating elements are turned on to heat the body, so that the first glass plate or the second glass plate is heated by the heat of the plurality of heating elements and / or the body.

12. The method of claim 11, wherein, In step 2, the first glass plate or the second glass plate is heated to 550-600°C by the heat of the plurality of heating elements and / or the body.

13. The method of claim 9, wherein, The female die body comprises a body, the body further comprises a first body and a second body, the first body is installed inside the second body in a lifting manner. Step 2 further comprises: Step 21, the first body is higher than the second body, so as to place the first glass plate or the second glass plate on the first body; Step 22, the first body is lower than the second body, so as to place the first glass plate or the second glass plate on the second body; Step 23, the male die body and the second body cooperate to press-form the first glass plate or the second glass plate.

14. The method of claim 13, wherein, The gap between the first body and the second body is 10-20 mm.

15. The method of claim 6, wherein, Step 3 further comprises: Step 31, the curved first glass plate or the curved second glass plate is moved from the forming die to an annealing area, wherein the annealing area is located outside the heating furnace; Step 32, the curved first glass plate or the curved second glass plate is heated and annealed in the annealing area; Step 33, the curved first glass plate or the curved second glass plate is cooled to room temperature.

16. The method of claim 15, wherein, In step 32, the annealing temperature is set to 400-530°C, and the annealing time is greater than or equal to 400 seconds.

17. The method of claim 15, wherein, Step 3 further comprises: Step 31, an annealing ring is provided, wherein the annealing ring is located outside the forming area of the forming die; Step 32, the curved first glass plate or the curved second glass plate is transported to the annealing area for annealing by using the annealing ring, and the curved first glass plate or the curved second glass plate is heated by the annealing ring during the transportation; and Step 33, cooling the curved first glass sheet and the curved second glass sheet to room temperature.

18. The method of claim 17, wherein, In step 32, the annealing time is greater than 20 seconds.

19. The method of claim 17, wherein, The annealing ring comprises a film cloth and a plurality of heating modules; Step 32 further comprises: placing the first glass sheet or the second glass sheet above the film cloth, wherein the first glass sheet or the second glass sheet and the plurality of heating modules are respectively located on the upper and lower sides of the film cloth; and turning on the plurality of heating modules to heat the film cloth, so that the first glass sheet or the second glass sheet is heated by the heat of the film cloth.

20. A vehicle characterized by The vehicle comprises a vehicle window glass prepared by the method of any one of claims 6-19.

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