A method for designing a spiral surface glass for an automobile

Abstract

This application discloses a design method for automotive spiral glass, relating to the field of automotive glass technology. The spiral glass designed using this method has a small deviation from the shaped glass surface, allowing for a good match and better meeting the motion requirements of a dual-rail window regulator. The method includes: selecting reference points on the front and rear boundaries of the shaped glass surface; drawing auxiliary line segments; fitting the auxiliary line segments to the shaped glass surface to determine the direction of the spiral's rotation axis; drawing an auxiliary circle based on the direction of the rotation axis and the endpoint of the rear boundary of the shaped glass surface; drawing the rotation axis of the spiral through the center of the auxiliary circle; calculating the spiral pitch; drawing a first spiral corresponding to the front boundary of the shaped glass surface and a second spiral corresponding to the rear boundary of the shaped glass surface based on the pitch; determining a target curve based on the rotation axis and the shaped glass surface; and drawing the spiral surface of the glass based on the target curve, the first spiral, and the second spiral.

Description

Technical Field

[0001] This application relates to the field of automotive glass technology, and more particularly to a method for designing automotive spiral surface glass. Background Technology

[0002] With the development of automotive technology, current car designs increasingly prioritize reducing wind resistance and noise, leading to a trend towards streamlined shapes. To meet these design requirements, commonly used automotive door windows include toroidal, drum-shaped, and spiral-shaped glass. Compared to other shapes, spiral-shaped glass, during operation, moves along its front and rear edges along their respective extension directions, i.e., along the front and rear spiral lines. For this purpose, a dual-rail window regulator is commonly used to drive the spiral glass along these spiral lines. To ensure greater stability during operation, the deviation of the glass's curvature radius at the two rails must be less than 5mm.

[0003] In the automotive design process, the first step is for a stylist to design the initial concept surface (CAS). Then, professional engineers design the specific structure based on this CAS. The reviewed CAS generally have good visual appeal. While the final structure designed for the actual engineering project will deviate somewhat from the CAS, it is still necessary to match the final structure as closely as possible to the CAS.

[0004] The initial shape of the glass corresponds to the shape glass surface. The spiral glass designed according to relevant technologies deviates significantly from the shape glass surface, making it difficult for the spiral surface of the designed glass to match the shape glass surface well. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a method for designing automotive spiral glass, which offers the following advantages: the spiral glass designed using this method has a smaller deviation from the shaped glass surface, allowing for better matching with the shaped glass surface and better meeting the motion requirements of the dual-rail window regulator.

[0006] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0007] This application provides a method for designing automotive spiral-surface glass, including the following steps:

[0008] Reference points are selected on the front and back edges of the shaped glass surface, and auxiliary line segments are drawn. The auxiliary line segments are fitted to the shaped glass surface to determine the axial direction of the rotation axis of the spiral.

[0009] Draw an auxiliary circle based on the axis of rotation and the endpoint of the rear boundary of the shaped glass surface. Draw the axis of rotation of the spiral through the center of the auxiliary circle.

[0010] Calculate the pitch of the helix;

[0011] Draw the first spiral line of the front boundary of the corresponding shaped glass surface and the second spiral line of the rear boundary of the corresponding shaped glass surface based on the pitch;

[0012] The target curve is determined based on the rotation axis and the shaped glass surface;

[0013] Draw the helical surface of the glass based on the target curve, the first helix, and the second helix.

[0014] In the automotive spiral glass design method provided in this application embodiment, the axial direction of the spiral rotation axis is first determined, then the spiral rotation axis is determined, and the spiral pitch is calculated. Finally, the spiral lines corresponding to the front and rear boundaries of the shaped glass surface are drawn, and the spiral surface of the glass is then drawn. Simultaneously, with the aid of auxiliary line segments and auxiliary circles, spiral glass that meets engineering requirements can be designed quickly and accurately. Compared to related technologies that use the front and rear boundaries of the shaped glass surface to fit circles, the automotive spiral glass design method provided in this application embodiment is more scientific. It refers to the steps of designing spiral lines in conventional methods to design automotive spiral glass, making the design method provided in this application embodiment more scientific. By fitting auxiliary line segments to the shaped glass surface, and adjusting the direction of the auxiliary line segments according to specific requirements, the deviation between the auxiliary line segments and the shaped glass surface is minimized, meeting the lifting and lowering requirements of the spiral glass, and ensuring a high degree of fit between the spiral glass and the initial shaped surface, thus restoring the intended shape as closely as possible.

[0015] In one possible implementation of this application, the steps of selecting reference points on the front and rear boundaries of the shaped glass surface, drawing auxiliary line segments, and fitting the auxiliary line segments to the shaped glass surface to determine the axial direction of the helix's rotation axis include:

[0016] Select the first boundary point at the rear boundary of the shaped glass surface;

[0017] Select any point on the front edge of the shaped glass;

[0018] Draw the first auxiliary line segment by connecting any point to the first boundary point;

[0019] Select a second boundary point at the rear boundary of the shaped glass surface;

[0020] Using the second boundary point as the endpoint and the orientation of the first auxiliary line segment as the direction, draw a second auxiliary line segment parallel to the first auxiliary line segment. The length of the second auxiliary line segment is equal to the length of the first auxiliary line segment. The rear endpoint of the second auxiliary line segment is the second boundary point, and the front endpoint is the endpoint of the second line segment.

[0021] Adjust the position of any point along the front edge of the shaped glass surface to fit the second auxiliary line segment to the shaped glass surface;

[0022] When the normal distance between the endpoint of the second line segment and the shaped glass surface is less than the target value, the extension direction of the second auxiliary line segment is the axial direction of the rotation axis.

[0023] In one possible implementation of this application, the step of drawing an auxiliary circle based on the axial direction of the rotation axis and the endpoint of the rear boundary of the shaped glass surface, and drawing a helix rotation axis through the center of the auxiliary circle includes:

[0024] Select a third boundary point at the rear boundary of the shaped glass surface;

[0025] Using the axis of rotation as the normal, draw the first reference plane passing through the first boundary point;

[0026] Draw the projection points of the third boundary point and the first projection point on the first reference plane;

[0027] Draw the projection point of the second boundary point on the first reference plane;

[0028] Draw an auxiliary circle passing through the first boundary point, the first projection point, and the second projection point;

[0029] Using the center of the auxiliary circle as the base point, draw the first straight line parallel to the extension direction of the second auxiliary line segment. The first straight line is the axis of rotation of the spiral.

[0030] In one possible implementation of this application, the step of calculating the pitch of the helix includes:

[0031] Using the center of the auxiliary circle as the vertex, determine the angle β between any two points between the first projection point, the second projection point, and the first boundary point;

[0032] Measure the length of the projection line segment between the third boundary point and the first projection point, and measure the length of the projection line segment between the second boundary point and the second projection point;

[0033] Calculate the difference L between the lengths of the projected line segments corresponding to the included angle β;

[0034] The formula for calculating the pitch is:

[0035] In one possible implementation of this application, the included angle β is the angle between the first boundary point and the first projection point with the center of the auxiliary circle as the vertex, and the difference L is the length of the projection line segment between the third boundary point and the first projection point.

[0036] In one possible implementation of this application, the step of drawing a first spiral line at the front edge of the corresponding shaped glass surface and a second spiral line at the rear edge of the corresponding shaped glass surface based on the pitch includes:

[0037] Using the axis of rotation as the axis of rotation, draw the first helix that passes through any point and has a pitch of S;

[0038] Draw a second helix with a pitch of S passing through the third boundary point, using the axis of rotation as the axis of rotation.

[0039] In one possible implementation of this application, the step of determining the target curve based on the rotation axis and the shaped glass surface includes:

[0040] Draw a second reference plane passing through the axis of rotation and any point;

[0041] The second reference plane intersects with the shaped glass surface to form an intersection curve;

[0042] The intersecting curve is the target curve.

[0043] In one possible implementation of this application, the step of drawing the helical surface of the glass based on the target curve, the first helix, and the second helix includes:

[0044] Draw the spiral surface of the glass using the target curve as the outline and the first and second spirals as guide lines.

[0045] In one possible implementation of this application, the target value is less than or equal to 0.5 mm.

[0046] In one possible implementation of this application, the pitches of the first helix and the second helix are equal, and the radii of the first helix and the second helix are equal. Attached Figure Description

[0047] Figure 1 A flowchart illustrating the automotive spiral surface glass design method provided in this application embodiment;

[0048] Figure 2 A schematic diagram showing the axial direction of the spiral rotation axis in the automotive spiral surface glass design method provided in this application embodiment;

[0049] Figure 3 A schematic diagram illustrating the determination of the helical rotation axis in the automotive helical surface glass design method provided in this application embodiment;

[0050] Figure 4A schematic diagram illustrating the calculation of the helical pitch for the automotive helical surface glass design method provided in this application embodiment;

[0051] Figure 5 The schematic diagram of the spiral surface of the glass is drawn using the automotive spiral surface glass design method provided in the embodiments of this application.

[0052] Figure label:

[0053] 1-Third boundary point; 2-Second boundary point; 3-First boundary point; 4-Rear boundary of the shaped glass surface; 5-Front boundary of the shaped glass surface; 6-Shaped glass surface; 7-Preliminary shaped surface; 8-Arbitrary point; 9-First auxiliary line segment; 10-Second auxiliary line segment; 11-End point of the second line segment; 12-First reference plane; 13-First projection point; 14-Second projection point; 15-Auxiliary circle; 16-Center of auxiliary circle; 17-Rotary axis of rotation of the spiral; 18-Third line segment; 19-Second line segment; 20-First line segment; 21-Second reference plane; 22-Second spiral; 23-First spiral; 24-Intersecting curve; 25-Spiral glass surface. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0055] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0056] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0057] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0058] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0059] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0060] This application provides a design method for automotive spiral glass. The spiral glass is also a type of hyperbolic curved glass, meaning it has curvature along both its length and width. Hyperbolic glass is commonly used in vehicles with high performance requirements, as it allows for better streamlined designs. Another reason for designing automotive glass as spiral glass is that the lifting mechanism drives the glass's movement in a spiral motion. Designing the glass as spiral glass ensures that the movement trajectory coincides with the glass's movement, resulting in greater stability during lifting. It should be noted that the spiral glass designed using this method is applicable not only to various types of vehicles, such as sedans, SUVs, multi-purpose vehicles, or large buses, but also to other applications, such as yachts, trains, or ships. This application does not limit the application to these applications.

[0061] To make the design method of automotive spiral glass provided in the embodiments of this application easy to understand, the relevant concepts of automotive spiral glass will be briefly explained first.

[0062] In the process of car design, the first step is for the stylist to design the initial styling surface 7. The initial styling surface 7 primarily considers factors such as the overall aesthetics of the car and reducing wind resistance and wind noise. It forms the basis for subsequent structural design and manufacturing. The portion of the initial styling surface 7 corresponding to the car's glass can be called the styling glass surface 6. In modern cars, the styling glass surface 6 is generally a free plane with hyperbolic curvature. The styling glass surface 6 corresponds to the front and rear ends of the car doors, featuring the front boundary 5 and rear boundary 4 of the styling glass surface.

[0063] The spiral glass 25 refers to glass whose front and rear boundaries extend along a spiral direction. Through cooperation with the glass lifting mechanism, the movement trajectories of the front and rear boundaries of the spiral glass 25 coincide with the extension directions of the spiral lines of the front and rear boundaries, respectively. This makes the spiral glass 25 more stable during the lifting process. For example, imagine a large-diameter bolt with spirally distributed threads. The tips of two adjacent threads can be understood as the extension directions of the spiral lines of the front and rear boundaries of the spiral glass 25. When the glass lifting mechanism drives the glass to move, it moves along the tips of two adjacent threads.

[0064] The purpose of the design method for automotive spiral glass 25 provided in this application embodiment is to design a spiral glass 25 with a small deviation from the shaped glass surface 6 and a high degree of fit based on the shaped glass surface 6.

[0065] Reference Figure 1 This is a flowchart illustrating the design method for automotive spiral glass 25 provided in this application embodiment, specifically including the following steps:

[0066] S1: Select reference points on the front boundary 5 and the back boundary 4 of the shaped glass surface, respectively, draw auxiliary line segments, and fit the auxiliary line segments to the shaped glass surface 6 to determine the axial direction of the spiral rotation axis 17.

[0067] It should be noted that in this step, the front boundary 5 and the rear boundary 4 of the shaped glass surface are relative and do not specifically refer to the front and back directions. For example, one of the two boundaries of the shaped glass surface 6 is the front boundary, and the other is the rear boundary; for different designers, the aforementioned "front boundary" can be defined as the rear boundary, and the aforementioned "rear boundary" can be defined as the front boundary. This application embodiment does not limit this. However, relative to the length of the front boundary 5 and the rear boundary 4 of the shaped glass surface, it is preferable to select the boundary of the longer shaped glass surface 6 as the rear boundary 4.

[0068] For example, in this application, the boundary of the longer shaped glass surface 6 is taken as the rear boundary 4 of the shaped glass surface. Assuming a spiral line has been fitted to the rear boundary 4 of the shaped glass surface, then there must be three points on this spiral line. Reversing the above process, a unique spiral line can be obtained from these three points on the rear boundary of the shaped glass. Of course, a spiral line can also be obtained through two points on the rear boundary of the shaped glass; however, this spiral line is not unique, and multiple spiral lines may pass through these two points.

[0069] In this application, three reference points are selected on the rear boundary 4 of the shaped glass surface for illustration.

[0070] First, arbitrarily select three reference points on the rear boundary 4 of the shaped glass surface. For ease of description, these three reference points are referred to as the first reference point, the second reference point, and the third reference point, respectively. Arbitrarily select one reference point on the front boundary of the shaped glass surface; for ease of description, this reference point is referred to as the fourth reference point. Connect any one of the first, second, and third reference points to the fourth reference point to obtain an auxiliary line segment. For example, connect the first and fourth reference points to obtain an auxiliary line segment. Then, using the second and third reference points as endpoints, draw an auxiliary line segment parallel to the aforementioned auxiliary line segment and of equal length towards the front boundary 5 of the shaped glass surface. At this point, adjust the position of the fourth reference point so that the other endpoint of the auxiliary line segment passing through the second and third reference points fits towards the shaped glass surface 6, ensuring that the distance between the other endpoint of the auxiliary line segment passing through the second and third reference points and the shaped glass surface 6 meets a pre-set requirement value. Then, the extension direction of the auxiliary line segment is the axial direction of the spiral rotation axis 17.

[0071] Alternatively, two points can be selected on the back boundary 4 of the shaped glass surface to draw auxiliary line segments, which will be explained in detail below.

[0072] S2: Draw an auxiliary circle 15 based on the axial direction of the spiral rotation axis 17 and the endpoint of the rear boundary 4 of the shaped glass surface, and draw the spiral rotation axis 17 through the center 16 of the auxiliary circle 15.

[0073] Since the axial direction of the helical rotation axis 17 has been determined in step S1, the goal of step S2 is to determine the helical rotation axis 17 based on its axial direction. This process can be simply explained as follows: for example, if the axial direction of the helical rotation axis 17 is determined to be vertical in step S1, the purpose of step S2 is to find the straight line that is the helical rotation axis 17 within the vertical direction.

[0074] Based on the axial direction of the spiral rotation axis 17 determined in step S1, a circle is drawn through the reference point of the rear boundary selected in step S1. By adjusting the radius of the circle, the arc of the shaped glass surface 6 corresponding to the circle is made as close as possible to the curve of the shaped glass surface 6. At this time, the straight line passing through the center of the circle and parallel to the axial direction of the spiral rotation axis 17 is the spiral rotation axis 17.

[0075] S3: Calculate the pitch of the helix;

[0076] Since the axial direction of the spiral rotation axis 17 has been determined, a straight line parallel to the axial direction of the spiral rotation axis 17 is drawn between the front boundary 5 and the rear boundary 4 of the shaped glass surface. The line segment obtained by the intersection of this straight line with the front boundary 5 and the rear boundary 4 of the shaped glass surface can be regarded as the pitch of the spiral.

[0077] S4: Draw the first spiral line 23 of the front boundary 5 of the corresponding shaped glass surface and the second spiral line 22 of the rear boundary 4 of the corresponding shaped glass surface based on the pitch;

[0078] Given that the rotation axis 17 of the spiral and the pitch of the spiral have been determined, a first spiral 23 can be drawn passing through the reference point of the front boundary 5 of the shaped glass surface; and a second spiral 22 can be drawn passing through the reference point of the rear boundary 4 of the shaped glass surface.

[0079] S5: Determine the target curve based on the spiral rotation axis 17 and the shaped glass surface 6;

[0080] The plane containing the spiral rotation axis 17 intersects with the curved surface containing the shaped glass surface 6 to form a curve. The curve segment between the first spiral 23 and the second spiral 22 can be considered as the cross section of the shaped glass surface 6.

[0081] S6: Draw the spiral surface of the glass based on the target curve, the first spiral 23, and the second spiral 22.

[0082] It should be noted that, for both the spiral glass 25 and the shaped glass surface 6, the most important aspect is ensuring that the endpoints of the spiral glass 25 and the shaped glass surface 6 match, meaning that the endpoints of the spiral glass 25 should fall as close as possible within the shaped glass surface 6. Therefore, in some embodiments of this application, the reference point selected for the rear boundary of the shaped glass is the endpoint of the rear boundary of the shaped glass, referring to... Figure 2 Therefore, step S1 specifically includes:

[0083] S11: Select the first boundary point 3 at the rear boundary 4 of the shaped glass surface.

[0084] It should be noted that, for the shaped glass surface 6, the rear boundary 4 of the shaped glass surface can be considered as a curve. The first boundary point 3 mentioned here can be any point on the rear boundary 4 of the shaped glass surface, including its endpoints. Regarding the matching of the spiral glass 25 and the shaped glass surface 6, the most important aspect is ensuring that the outermost edge of the spiral glass 25 matches the shaped glass surface 6. Therefore, the first boundary point 3 can be selected as an endpoint of the rear boundary 4 of the shaped glass surface. Specifically, the rear boundary 4 of the shaped glass surface has two endpoints; either endpoint can be selected, and for ease of description, this endpoint will be referred to as the first boundary point 3. For example, refer to... Figure 2The upper endpoint of the rear boundary 4 of the shaped glass surface can be selected as the first boundary point 3. In addition, in some other embodiments of this application, the lower endpoint of the rear boundary 4 of the shaped glass surface can also be selected as the first boundary point 3, and this application does not limit this.

[0085] Alternatively, the first boundary point 3 can be selected as any other point on the rear boundary 4 of the shaped glass, but this application embodiment does not limit this.

[0086] S12: Select any point 8 on the front boundary 5 of the shaped glass.

[0087] In this step, any point can be selected as a reference point at the front edge 5 of the shaped glass.

[0088] S13: Connect the arbitrary point 8 and the first boundary point 3 to draw the first auxiliary line segment 9.

[0089] S14: Select the second boundary point 2 at the back boundary 4 of the shaped glass surface.

[0090] It should be noted that the second boundary point 2 mentioned here refers to another point on the rear boundary 4 of the shaped glass surface, besides the first boundary point 3. In some embodiments of this application, reference is made to... Figure 2 Since the first boundary point 3 is one of the endpoints of the rear boundary 4 of the shaped glass surface, the second boundary point 2 can be selected as the midpoint of the rear boundary 4 of the shaped glass surface.

[0091] The midpoint of the rear boundary 4 of the shaped glass surface mentioned here is relative to the two endpoints of the rear boundary 4 of the shaped glass surface. The distance between the midpoint of the rear boundary 4 of the shaped glass surface and the two endpoints of the rear boundary 4 of the shaped glass surface is equal along the curve of the rear boundary 4 of the shaped glass surface.

[0092] S15: Using the second boundary point 2 as the endpoint and the orientation of the first auxiliary line segment 9 as the direction, draw a second auxiliary line segment 10 parallel to the first auxiliary line segment 9, ensuring that the length of the second auxiliary line segment 10 is equal to the length of the first auxiliary line segment 9. The rear endpoint of the second auxiliary line segment 10 is the second boundary point 2, and the front endpoint of the second auxiliary line segment 10 is the second line segment endpoint 11. It should be noted that the term "second line segment endpoint 11" is used here to distinguish it from the second boundary point 2 and should not be considered as the two endpoints of the second auxiliary line segment 10. Specifically, one endpoint of the second auxiliary line segment 10 is the second boundary point 2, and the other endpoint of the second auxiliary line segment 10 is the second line segment endpoint 11.

[0093] Specifically, in this step, since any point 8 is on the front boundary 5 of the shaped glass surface, it is equivalent to drawing a second auxiliary line segment 10 with the second boundary point 2 of the rear boundary 4 of the shaped glass surface as its endpoint towards the front boundary 5 of the shaped glass surface. Furthermore, the length of the second auxiliary line segment 10 is equal to the length of the first auxiliary line segment 9, and the second auxiliary line segment 10 is parallel to the first auxiliary line segment 9. For ease of description, the other endpoint of the second auxiliary line segment 10, besides the second boundary point 2 of the rear boundary 4 of the shaped glass surface, is referred to as the second line segment endpoint 11. It should be noted that the second line segment endpoint 11 may not be on the curved surface of the shaped glass surface 6.

[0094] S16: Adjust the position of any point 8 along the front boundary 5 of the shaped glass surface so that the second auxiliary line segment 10 fits the shaped glass surface 6.

[0095] Since the second auxiliary line segment 10 is parallel to the first auxiliary line segment 9, adjusting the position of any point 8 along the front boundary 5 of the shaped glass surface is equivalent to adjusting the extension direction and length of the first auxiliary line segment 9. Therefore, correspondingly, the extension direction and length of the second auxiliary line segment 10 are also changed. This allows the second auxiliary line segment 10 to fit onto the shaped glass surface 6.

[0096] Since one endpoint of the second auxiliary line segment 10, namely the second boundary point 2 of the rear boundary 4 of the shaped glass surface, is fixed, when the extension direction and length of the second auxiliary line segment 10 change, the position of the endpoint 11 of the second line segment must change. When the normal distance between the endpoint 11 of the second line segment and the shaped glass surface 6 is less than the target value, the extension direction of the second auxiliary line segment 10 is the axial direction of the spiral rotation axis 17. Since the first auxiliary line segment 9 is parallel to the second auxiliary line segment 10, the extension direction of the first auxiliary line segment 9 is also the axial direction of the spiral rotation axis 17. It should be noted that the target value mentioned here can be understood as the deviation value of the front and rear door glass surfaces in the B-pillar area of ​​the car. For models with higher requirements, the target value can be set to 0.5mm. Of course, the target value can also be set smaller or larger. This application embodiment does not limit this and can be selected according to the specific design requirements.

[0097] Based on this, in some embodiments of this application, reference is made to Figure 2 and Figure 3 Step S2 specifically includes:

[0098] S21: Select the third boundary point 1 at the rear boundary 4 of the shaped glass surface.

[0099] Specifically, the third boundary point 1 mentioned here refers to any other point on the rear boundary 4 of the shaped glass surface, other than the first boundary point 3 and the second boundary point 2. (See reference...) Figure 2 and Figure 3 For the above-mentioned selection of the first boundary point 3 as one endpoint of the rear boundary 4 of the shaped glass surface and the second boundary point 2 as the midpoint of the rear boundary 4 of the shaped glass surface, the third boundary point 1 can be selected as the other endpoint of the rear boundary 4 of the shaped glass surface.

[0100] S22: Using the axis direction of the spiral rotation axis 17 as the normal, draw the first reference plane 12 passing through the first boundary point 3.

[0101] This step specifically refers to drawing a first reference plane 12 that passes through the first boundary point 3, and the extension direction of the first reference plane 12 is perpendicular to the axis of the helical rotation axis 17.

[0102] S23: Draw the projection point of the third boundary point 1 on the first reference plane 12: the first projection point 13.

[0103] S24: Draw the projection point of the second boundary point 2 on the first reference plane 12: the second projection point 14.

[0104] S25: Draw an auxiliary circle 15 that passes through the first boundary point 3, the first projection point 13, and the second projection point 14.

[0105] Specifically, since three points determine a circle, the auxiliary circle 15 drawn through the first boundary point 3, the first projection point 13, and the second projection point 14 is a definite circle.

[0106] S26: Using the center 16 of the auxiliary circle 15 as the base point, draw the first straight line parallel to the extension direction of the second auxiliary line segment 10. The first straight line is the axis of rotation of the spiral 17.

[0107] Based on this, step S3 specifically includes:

[0108] S31: Using the center 16 of the auxiliary circle 15 determined above as the vertex, determine the included angle β between any two points between the first projection point 13, the second projection point 14 and the first boundary point 3.

[0109] Reference Figure 2 Since the first projection point 13, the second projection point 14, and the first boundary point 3 are in the same plane, the angle between any two points of the first projection point 13, the second projection point 14, and the first boundary point 3 is a planar angle relationship, which is easy to understand.

[0110] S32: Measure the length of the projection line segment between the third boundary point 1 and the first projection point 13, and measure the length of the projection line segment between the second boundary point 2 and the second projection point 14.

[0111] S33: Calculate the difference L between the lengths of the projected line segments corresponding to the included angle β.

[0112] The formula for calculating the pitch is:

[0113] It should be noted that since the first boundary point 3 is located within the first reference plane 12, the length between the first boundary point 3 and its projection point on the first reference plane 12 can be considered to be zero. When the side corresponding to the included angle β passes through the first boundary point 3, L refers to the length of the projection line segment of the other side corresponding to the included angle β.

[0114] In this embodiment, the vertex of the included angle β is the center 16 of the auxiliary circle 15, and there are three possible angle sizes for the included angle β, specifically:

[0115] Example 1: One side of the included angle β is the ray formed by the center 16 of the auxiliary circle 15 and the first boundary point 3, and the other side of the included angle β is the ray formed by the center 16 of the auxiliary circle 15 and the second projection point 14. At this time, L refers to the length of the projection line segment between the second boundary point 2 and the second projection point 14.

[0116] Example 2: One side of the included angle β is the ray formed by the center 16 of the auxiliary circle 15 and the first boundary point 3, and the other side of the included angle β is the ray formed by the center 16 of the auxiliary circle 15 and the first projection point 13. At this time, L refers to the length of the projection line segment between the third boundary point 1 and the first projection point 13.

[0117] Example 3: One side of the included angle β is the ray formed by the center 16 of the auxiliary circle 15 and the first projection point 13, and the other side of the included angle β is the ray formed by the center 16 of the auxiliary circle 15 and the second projection point 14. At this time, L refers to the difference between the length of the projection line segment between the third boundary point 1 and the first projection point 13 and the length of the projection line segment between the second boundary point 2 and the second projection point 14.

[0118] In addition, the formula for calculating the pitch The following analogy will help in understanding this formula.

[0119] First, assume a cylinder. Draw a helix on the side surface of the cylinder, intersecting the bottom surface of the cylinder at a point (equivalent to the first boundary point 3 in this application). For ease of description, this point is referred to as the first point. Next, select a second point (equivalent to the third boundary point 1 or the second boundary point 2 in this application) near the point where the helix intersects the bottom surface of the cylinder. Project the second point onto the bottom surface of the cylinder. The projections of the first and second points form an angle β with the bottom surface of the cylinder. The length of the line segment between the second point and the projection of the second point is L. Imagine that if the second point moves along the helix from the first point, both β and L gradually increase during the movement of the second point. During the movement of the second point, the projection of the second point also moves along the arc of the circle on the bottom surface of the cylinder. When the projection of the second point has completed one revolution along the arc of the circle on the bottom surface of the cylinder, L is the length of the helix pitch. Therefore, the formula for calculating the pitch can be deduced.

[0120] As described above, for the spiral glass 25 and the shaped glass surface 6, the most important thing is to match the endpoints of the spiral glass 25 with the shaped glass surface 6. Therefore, in some embodiments of this application, reference is made to... Figure 4 The included angle β refers to the angle between the first boundary point 3 and the first projection point 13 with the center 16 of the auxiliary circle 15 as the vertex, and the corresponding L refers to the length of the projected line segment between the third boundary point 1 and the first projection point 13. For ease of description, the line segment between the center 16 of the auxiliary circle 15 and the first boundary point 3 is called the first line segment 20, the line segment between the center 16 of the auxiliary circle 15 and the first projection point 13 is called the second line segment 19, and the line segment between the third boundary point 1 and the first projection point 13 is called the third line segment 18. The included angle between the first line segment 20 and the second line segment 19 is β, and the length of the third line segment 18 is L. This allows the spiral surface glass 25 designed using the automotive spiral surface glass 25 design method provided in this application to better match the shaped glass surface 6.

[0121] Based on this, refer to Figure 5 Step S4 specifically includes:

[0122] S41: Using the already determined spiral rotation axis 17 as the axis, draw the first spiral 23 with a pitch of S passing through any point 8 on the front boundary 5 of the shaped glass.

[0123] S42: Using the already determined helical rotation axis 17 as the axis, draw the second helical line 22 with the third boundary point 1 and the pitch S on the boundary after shaping.

[0124] Furthermore, step S5 specifically includes:

[0125] Draw the second reference plane 21 that passes through the helical rotation axis 17 and any point 8;

[0126] The second reference plane 21 intersects with the shaped glass surface 6 to obtain the intersection curve 24; this intersection curve 24 is the target curve.

[0127] Based on this, step S6 specifically includes:

[0128] By drawing a surface using the intersecting curve 24 as the sweep line and the first spiral line 23 and the second spiral line 22 as the guide line, the spiral surface of the glass is obtained.

[0129] It should be noted that in some embodiments of this application, the target value of the normal distance between the endpoint 11 of the second line segment and the shaped glass surface 6 is set to be less than or equal to 0.5 mm. If this target value is set too small, the deviation between the front and rear door glass surfaces in the B-pillar area of ​​the car will be large, affecting the car's aesthetics. If this target value is set too large, it will cause a large deviation between the spiral glass 25 and the shaped glass surface 6. Setting the target value to be less than or equal to 0.5 mm ensures both the car's aesthetics and a good match between the spiral glass 25 and the shaped glass surface 6.

[0130] It should be noted that, considering only the fit between the spiral glass 25 and the shaped glass 6, the smaller the normal distance between the endpoint 11 of the second line segment and the shaped glass 6, the better. However, in actual engineering practice, an excessively small normal distance between the endpoint 11 of the second line segment and the shaped glass 6 can adversely affect the deviation of the front and rear spiral glass 25 in the B-pillar area. Therefore, with the consent of the stylist, the target value of the normal distance between the endpoint 11 of the second line segment and the shaped glass 6 can be set to be slightly greater than 0.5mm.

[0131] In addition, in some embodiments of this application, the first helix 23 and the second helix 22 have the same pitch and the first helix 23 and the second helix 22 have the same radius.

[0132] In designing the shaped glass surface 6, to ensure greater stability of the spiral glass 25 during lifting, the radius of curvature deviation of the glass at the guide rails of the spiral glass 25 corresponding to the front boundary 5 and the rear boundary 4 of the shaped glass surface is required to be less than 5mm. In the embodiments of this application, by setting the pitch and radius of the first spiral 23 and the second spiral 22 to be equal, it is equivalent to the spiral glass 25 designed using this method having equal radii of curvature at the two guide rails.

[0133] It should be noted that, in the embodiments of this application, if the above methods are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks. Thus, the embodiments of this application are not limited to any specific hardware and software combination.

[0134] Accordingly, embodiments of this application provide a computer-readable storage medium storing at least one executable instruction that causes a processor to perform the steps in the automotive spiral glass design method provided in the above embodiments.

[0135] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method of designing an automotive spiral glass, characterized in that, Includes the following steps: Reference points are selected on the front edge and the back edge of the shaped glass surface, respectively, and auxiliary line segments are drawn. The auxiliary line segments are fitted to the shaped glass surface to determine the axial direction of the rotation axis of the spiral. An auxiliary circle is drawn based on the axial direction of the rotation axis and the endpoint of the rear boundary of the shaped glass surface. The rotation axis of the spiral is drawn through the center of the auxiliary circle. Calculate the pitch of the helix; Based on the pitch, draw a first spiral line corresponding to the front boundary of the shaped glass surface and a second spiral line corresponding to the rear boundary of the shaped glass surface; The target curve is determined based on the rotation axis and the shaped glass surface; Draw the helical surface of the glass based on the target curve, the first helix, and the second helix; The steps of selecting reference points on the front and rear boundaries of the shaped glass surface, drawing auxiliary line segments, and fitting the auxiliary line segments to the shaped glass surface to determine the axial direction of the helix's rotation axis include: Select a first boundary point at the rear boundary of the shaped glass surface; Select any point on the front edge of the shaped glass; Draw a first auxiliary line segment by connecting the arbitrary point and the first boundary point; A second boundary point is selected at the rear boundary of the shaped glass surface; Using the second boundary point as the endpoint and the orientation of the first auxiliary line segment as the direction, draw a second auxiliary line segment parallel to the first auxiliary line segment. The length of the second auxiliary line segment is equal to the length of the first auxiliary line segment. The rear endpoint of the second auxiliary line segment is the second boundary point, and the front endpoint is the endpoint of the second line segment. Adjust the position of the arbitrary point along the front edge of the shaped glass surface so that the second auxiliary line segment fits the shaped glass surface; When the normal distance between the endpoint of the second line segment and the shaped glass surface is less than the target value, the extension direction of the second auxiliary line segment is the axial direction of the rotation axis.

2. The method of designing an automotive spiral glass according to claim 1, wherein, The step of drawing the auxiliary circle based on the axial direction of the rotation axis and the endpoint of the rear boundary of the shaped glass surface, and drawing the rotation axis of the spiral through the center of the auxiliary circle, includes: A third boundary point is selected at the rear boundary of the shaped glass surface; Using the axial direction of the rotation axis as the normal, draw a first reference plane passing through the first boundary point; Draw the projection point of the third boundary point, the first projection point, on the first reference plane; Draw the projection points of the second boundary points on the first reference plane; Draw the auxiliary circle passing through the first boundary point, the first projection point, and the second projection point; Using the center of the auxiliary circle as the base point, draw a first straight line parallel to the extension direction of the second auxiliary line segment. The first straight line is the axis of rotation of the spiral.

3. The method of designing a spiral face glass for an automotive vehicle according to claim 2, wherein, The step of calculating the pitch of the helix includes: determining an angle between any two of the first projection point, the second projection point, and the first boundary point, with the center of the auxiliary circle as a vertex ; Measure the length of the projection line segment between the third boundary point and the first projection point, and measure the length of the projection line segment between the second boundary point and the second projection point; calculating the included angle corresponding to the difference in length of the projected line segments ; The calculation formula of the pitch is: .

4. The method of designing an automotive spiral glass according to claim 3, wherein, the included angle the difference value is an included angle between the center of the auxiliary circle and a line segment between the first boundary point and the first projection point the difference value is a length of a projection line segment between the third boundary point and the first projection point.

5. The method of designing an automotive spiral glass according to claim 4, wherein, The step of drawing a first spiral line corresponding to the front boundary of the shaped glass surface and a second spiral line corresponding to the rear boundary of the shaped glass surface based on the pitch includes: A first helix line is drawn through the arbitrary point with the rotation axis as an axis, and the pitch is ​ A second helix line is drawn with the rotation axis as an axis, through the third boundary point, and the pitch is ​ 6. The method of designing an automotive spiral glass according to claim 5, wherein, The step of determining the target curve based on the rotation axis and the glass forming surface comprises: drawing a second reference plane passing through the rotation axis and the arbitrary point; the second reference plane intersects with the glass forming surface to obtain an intersection curve; the intersection curve is the target curve.

7. The method of designing an automotive spiral glass according to claim 6, wherein, The step of drawing the spiral surface of the glass according to the target curve, the first spiral line and the second spiral line comprises: drawing the spiral surface of the glass with the target curve as the contour line and with the first spiral line and the second spiral line as the guide lines.

8. The automotive wraparound glass design method according to any one of claims 1 to 7, characterized in that, The target value is less than or equal to 0.5 mm.

9. The automotive wraparound glass design method according to any one of claims 1 to 7, characterized in that, The first spiral line and the second spiral line have equal pitches and equal radii. The first spiral line and the second spiral line have equal pitches and equal radii.

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