A method of smoothing color development, tire and tire mold

Abstract

The application provides a smooth color developing method, a tire and a tire mold, belongs to the tire vulcanization technical field, and makes a pattern mark displayed on a tire surface, comprising reading a corresponding gray value of the pattern mark, inversely taking the gray value of the pattern mark, obtaining a required processing order corresponding to different gray values of the pattern mark, obtaining a depth and an opening width of a to-be-processed groove corresponding to different gray values of the pattern mark according to a mapping rule, and a ratio of the groove depth and the opening width corresponding to different gray values being a same constant value; the to-be-processed groove is processed on a surface of the tire mold, the tire is vulcanized by using the tire mold, and the pattern mark is displayed on the tire surface; the depth-width ratio is limited to the same ratio, so that the reflection times and the emission angle of light entering the groove are consistent, the accuracy corresponding to the gray value is ensured, the accurate display of the pattern mark is realized, and the transition is smooth and natural.

Description

Technical Field

[0001] This invention belongs to the field of tire vulcanization technology, specifically relating to a smooth color development method, a tire, and a tire mold. Background Technology

[0002] With the development of the tire industry, tire visual design has gradually become an important means of highlighting brand identity and attracting consumers. However, due to the nature of tires as black rubber products, it is difficult to reflect subtle variations in the pattern logo. Currently, there are two common solutions: one is to cover the tire surface with paint or stickers. This solution has good visual effects, but it increases the number of steps and is more prone to peeling off, affecting the appearance. The second solution is generally preferred, which is to increase the contrast of the pattern logo. For example, by changing the density or groove depth of local areas to create contrast and indirectly reflect color changes. However, the pattern logo displayed by this solution is usually not very detailed and the visual effect is generally average.

[0003] Regarding the issue of insufficient detail in the second scheme's pattern markings on the tire surface, some potential solutions have emerged, such as EP3838573B1, which maps the pattern's grayscale to laser energy to create corresponding grooves on the tire mold surface. However, testing revealed that this solution still suffers from missing details in some areas, making it difficult to fully and continuously represent the changing details of the pattern markings, and further improvements are needed. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a smooth color rendering method, a tire, and a tire mold, which enables the pattern markings to be displayed on the tire surface. The pattern markings have multiple different grayscale areas, with accurate grayscale correspondence, smooth and natural transitions, and complete details.

[0005] First, this invention provides a smooth color rendering method that displays pattern markings on the tire surface. The pattern markings have several grayscale regions corresponding to different grayscale values. The invention is characterized by...

[0006] Read the grayscale value corresponding to the pattern identifier;

[0007] The grayscale value of the pattern identifier is reversed to obtain the processing order corresponding to different grayscale values ​​of the pattern identifier;

[0008] Based on the required processing order, the depth and opening width of the groove to be processed corresponding to different gray values ​​of the pattern identifier are obtained according to the mapping rule. The ratio of the groove depth to the opening width corresponding to different gray values ​​is a constant value.

[0009] The groove to be processed is machined on the surface of the tire mold, and the tire is vulcanized using the tire mold so that the pattern markings are displayed on the tire surface.

[0010] Furthermore, the mapping rule includes: calculating or presetting the average groove depth, multiplying the average groove depth by the number of processing steps corresponding to different gray values ​​of the pattern identifier to obtain the depth of the groove to be processed corresponding to different gray values ​​of the pattern identifier, and calculating the corresponding groove opening width based on the groove depth;

[0011] Alternatively, calculate or preset the average groove opening width, multiply the average groove opening width by the number of processing steps corresponding to different gray values ​​of the pattern identifier, to obtain the opening width of the groove to be processed corresponding to different gray values ​​of the pattern identifier, and calculate the corresponding groove depth based on the groove opening width.

[0012] Furthermore, the calculation of the average groove depth includes: setting a preset maximum groove depth, and corresponding the preset maximum groove depth to the maximum grayscale value of the pattern mark; dividing the preset maximum groove depth by the number of processing steps required corresponding to the maximum grayscale value of the pattern mark to obtain the average groove depth.

[0013] Alternatively, the calculation of the average groove opening width includes: setting a preset maximum groove opening width, corresponding the preset maximum groove opening width to the maximum grayscale value of the pattern identifier; dividing the preset maximum groove opening width by the number of processing steps required corresponding to the maximum grayscale value of the pattern identifier to obtain the average groove opening width.

[0014] Furthermore, the ratio of groove depth to opening width corresponding to different grayscale values ​​is a constant value, which is between 1.2 and 2.2.

[0015] Furthermore, the maximum depth of the preset groove is 0.25-0.55mm; or, the maximum opening width of the preset groove is 0.05-0.5mm.

[0016] Furthermore, the cross-section of the groove is V-shaped; or, the cross-section of the groove is approximately V-shaped, the cross-section of the groove has an inclined surface, and the bottom surface is a sharp corner, a plane, or an arc surface.

[0017] Furthermore, the mapping rule also includes that the pattern identifier has several grayscale regions corresponding to different grayscale values, and some of the grooves to be processed fall into two different grayscale regions. The processing order of this part of the grooves to be processed is equal to the average of the processing order of the corresponding grayscale values ​​of the two grayscale regions.

[0018] Furthermore, the pattern markings are set on the tire tread, and the projected length of the groove to be processed in the tire circumferential direction is greater than the projected length in the tire axial direction.

[0019] Alternatively, the pattern markings are set on the tire sidewall, and the projected length of the groove to be processed in the radial direction of the tire is greater than the projected length in the circumferential direction of the tire.

[0020] Secondly, the present invention also provides a tire in which a pattern is displayed on the tire surface using the aforementioned smooth color rendering method.

[0021] Furthermore, a tire mold is also provided, comprising a tread block and a side plate, wherein the cavity surface of the tread block or the side plate is machined with the grooves to be processed as described above, for vulcanizing the aforementioned tire so that the pattern markings are displayed on the tire surface.

[0022] The technical solution provided by this invention has the following advantages compared with the prior art:

[0023] 1. By establishing a linear correspondence between the grayscale of the pattern identifier and the width and depth of the groove opening, and by simultaneously adjusting the width and depth of the groove opening to ensure that the ratio of depth to opening width is the same for the same pattern identifier, accurate grayscale correspondence is achieved, resulting in a smooth and natural transition with complete details. Compared to adjusting the opening width or depth individually, this solution limits the aspect ratio to the same value, thus ensuring consistent reflections and exit angles of light entering the groove. This guarantees accurate grayscale correspondence and accurate display of the pattern identifier with a smooth and natural transition.

[0024] 2. Due to the consistency of the ratio of groove depth to opening width, and the large difference in grayscale levels of the same pattern mark, the range of opening width and depth is relatively large. By limiting the ratio of groove depth to opening width, we can avoid both the problem of blurring caused by excessive groove depth-to-width ratio affecting contrast due to diffuse reflection, and the problem of unclear distinction caused by excessive groove depth-to-width ratio.

[0025] 3. Considering that the tire sidewall or tread is not a standard flat surface, but rather a curved protrusion in a certain direction, the grayscale display of the pattern markings is easily affected by the curvature. Therefore, the main direction of the groove is limited to reduce the change in the groove's emission angle caused by the curvature. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 It is a schematic diagram showing the pattern markings on the tire surface;

[0028] Figure 2 This is a schematic diagram of the tire mold vulcanizing tire blanks according to the present invention;

[0029] Figure 3 This is a schematic diagram of the pattern markings of the present invention;

[0030] Figure 4 This is a schematic diagram of a groove to be processed according to the present invention;

[0031] Figure 5 This is another schematic diagram of the groove to be processed according to the present invention;

[0032] Figure 6 This is a cross-sectional schematic diagram of the groove to be processed according to the present invention;

[0033] Figure 7 This is a schematic diagram illustrating the effect of the depth-to-width ratio of the groove to be processed on light in this invention;

[0034] Figure 8 This is a schematic diagram of the cross-sectional shape of the groove to be processed according to the present invention;

[0035] Figure 9 This is a schematic diagram of the cross-section of the groove in the adjacent grayscale region of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Tire; 101. Logo; 1011. First grayscale area; 1012. Second grayscale area;

[0038] 200. Tire mold; 201. Tread block; 202. Side plate; 203. Tire blank. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] like Figures 1 to 6 As shown, a smooth color rendering method is used to display a pattern mark 101 on the surface of a tire 100. The pattern mark 101 has several grayscale regions corresponding to different grayscale values. Here, the surface of the tire 100 can be the tire tread or the tire sidewall. The pattern mark 101 having several grayscale regions corresponding to different grayscale values ​​refers to at least five different grayscale values. Specifically, the grayscale values ​​can be expressed using different quantization methods. For example, common methods include using 256 grayscale levels from 0 to 255, where 0 represents pure black and 255 represents pure white; or using a K value from 0% to 100%, where 0% corresponds to pure white and 100% corresponds to pure black. This solution preferably matches the grayscale value of pattern identifier 101 according to the commonly used 256 grayscale levels. The grayscale value corresponds to grayscale levels 0-255, where 0 represents pure black, 255 represents pure white, and the numbers in between represent the transition from pure black to pure white. Unless otherwise specified, all subsequent grayscale levels are divided into 256 levels. This corresponds to conventional image processing techniques and will not be elaborated further here.

[0045] The method specifically includes: reading the grayscale value corresponding to the pattern identifier 101; reversing the grayscale value of the pattern identifier 101 to obtain the processing order corresponding to different grayscale values ​​of the pattern identifier 101; according to the obtained processing order, obtaining the depth and opening width of the groove to be processed corresponding to different grayscale values ​​of the pattern identifier 101 according to the mapping rule, wherein the ratio of the groove depth to the opening width corresponding to different grayscale values ​​is a constant value; processing the groove to be processed on the surface of the tire mold 200 and then vulcanizing the tire 100, thereby displaying the pattern identifier 101 on the surface of the tire 100.

[0046] It should be further explained that the grayscale value of the pattern identifier 101 is reversed to obtain the number of processing levels corresponding to different grayscale values ​​of the pattern identifier 101. Here, reversing the grayscale value means mapping the grayscale value in the image to its complement relative to the maximum value. The number of processing levels corresponding to different grayscale values ​​refers to the number of minimum grayscale levels corresponding to the complement of different grayscale values ​​relative to the maximum value. The number of minimum grayscale levels corresponding to the complement of different grayscale values ​​relative to the maximum value is usually an integer. If it is a decimal, it is rounded off. Let's take 256 gray levels and K values ​​as examples. In the 256 gray levels divided into 0-255, the gray value corresponding to the pattern logo 101 is expressed as a gray value of 150 in 256 gray levels. Taking the reverse value, that is, subtracting 150 from the maximum value 255, we get its complement relative to the maximum value, which is 105. In the 256 gray levels divided into 0-255, the smallest gray level is 1, so the corresponding processing level is 105. In the K value divided into 0%-100%, the gray value corresponding to the pattern logo 101 is expressed as a K value of 35%. Taking the reverse value, that is, subtracting 35% from the maximum value 100%, we get its complement relative to the maximum value, which is 75%. In the K value divided into 0%-100%, the smallest gray level is 1%, so the corresponding processing level is 75.

[0047] Secondly, it should be noted that the surface of tire 100 can be an outer surface that does not produce depressions or protrusions, or a surface that has been translated and depressed or protruded relative to the outer surface; the surface gray value of tire 100 vulcanized with different raw materials and processes may vary, but for tire 100 vulcanized with the same raw materials and processes in the same batch, the surface gray value of tire 100 can be expected or measured.

[0048] The specific processing method of the pattern mark is to process the groove to be processed on the surface of the tire mold 200, and then use the tire mold 200 to vulcanize the tire. During the vulcanization process, the groove to be processed is imprinted onto the surface of the tire blank 203. After vulcanization, a tire 100 with the pattern mark 101 is obtained. The vulcanized tire 100 in this invention refers to this method.

[0049] Furthermore, the grooves on the surface of the tire mold 200 can be processed using, but are not limited to, laser engraving or mechanical engraving methods. These are conventional processing techniques that can be selected by those skilled in the art according to their needs and will not be described in detail. The positional correspondence between the pattern mark 101 and the grooves on the tire 100 or the tire mold 200 is also generally known to those skilled in the art and can be implemented.

[0050] In actual production, a texture pattern can be used to cover the pattern mark 101. The texture pattern can be selected from the existing tire mold or tire texture in the field. Then, according to the depth and opening width of the groove to be processed, the groove depth and opening width of the texture falling into different gray areas of the pattern mark 101 are adjusted.

[0051] The mapping rules include: reading the preset maximum groove depth, obtaining the depth of the groove to be processed corresponding to different gray values ​​of pattern identifier 101 based on the preset maximum groove depth and the required processing level, and calculating the corresponding groove opening width based on the groove depth; or, reading the preset maximum groove opening width, obtaining the groove opening width corresponding to different gray values ​​of pattern identifier 101 based on the preset maximum groove opening width and the required processing level, and calculating the corresponding groove depth based on the groove opening width.

[0052] The above-mentioned method of obtaining the depth of the groove to be processed corresponding to different gray values ​​of pattern mark 101 based on the preset maximum groove depth and the required processing level includes: corresponding the preset maximum groove depth to the maximum gray value of pattern mark 101; dividing the preset maximum groove depth by the required processing level corresponding to the maximum gray value of pattern mark 101 to obtain the average groove depth; and multiplying the average groove depth by the required processing level corresponding to different gray values ​​of pattern mark 101 to obtain the depth of the groove to be processed corresponding to different gray values ​​of pattern mark 101.

[0053] The above-mentioned method of obtaining the groove opening width of the groove corresponding to different gray values ​​of pattern identifier 101 based on the preset maximum groove opening width and the required processing level includes: corresponding the preset maximum groove opening width to the maximum gray value of pattern identifier 101; dividing the preset maximum groove opening width by the required processing level corresponding to the maximum gray value of pattern identifier 101 to obtain the average groove opening width; and multiplying the average groove opening width by the required processing level corresponding to different gray values ​​of pattern identifier 101 to obtain the opening width of the groove corresponding to different gray values ​​of pattern identifier 101.

[0054] The preset maximum groove depth or preset maximum groove opening width refers to the maximum depth or maximum opening width of the groove to be processed preset according to different requirements. This is mapped to the maximum grayscale value, meaning the deepest part of the groove or the widest part of the opening corresponds to the darkest part of pattern marker 101. The specific arrangement or trajectory of the grooves to be processed can be... Figure 5 The parallel straight lines shown Figure 4The wavy shape shown, as well as other arrangements or trajectories that give the tire 100 pattern marking 101 a blackened effect; additionally, it should be noted that different grayscale values ​​correspond to changes in the opening width of the grooves, but the spacing between the grooves can vary with the grooves, preferably not with the opening width of the grooves, that is, the spacing between the grooves is a certain value between 0.05-0.5mm. For example, when the groove is V-shaped and the trajectory is a parallel straight line, the spacing between the lower vertices of the grooves is the same as the preset maximum opening width of the groove, set to 0.35mm. When the opening width of a certain groove becomes 0.25mm, a blank space of 0.05mm remains on each side of the groove. To maintain the center-to-center spacing of the grooves at 0.35mm; further, considering the impact of blank space on the display effect, based on the depth and opening width of the grooves to be processed corresponding to different grayscale values ​​of the pattern identifier according to the obtained processing order and the mapping rule, the depth and opening width of the grooves to be processed are multiplied by a coefficient λ, which is used as the new depth and opening width of the grooves to be processed. After processing the grooves to be processed on the surface of the tire mold, the tire is vulcanized, where λ is equal to (0.35-0.65)*[(groove spacing - opening width of the groove to be processed) / groove spacing]+1, which is used to compensate for the impact of the increase in blank space caused by the change in opening width.

[0055] Furthermore, the mapping rules are not limited to the method of preset maximum groove depth or maximum opening width. Using this method is easy to correspond and calculate, for example, the center distance of the grooves is corresponded to the preset maximum opening width of the groove. However, the average groove depth corresponding to the minimum gray level can also be preset directly, that is, the value of the average groove depth is directly given. The surface of tire 100 corresponds to pure white gray value. The average groove depth is multiplied by the number of processing steps corresponding to different gray values ​​of pattern mark 101 to obtain the depth of the groove to be processed corresponding to different gray values ​​of pattern mark 101. Alternatively, the average groove opening width corresponding to each gray value can be preset. The surface of tire 100 corresponds to pure white gray value. The average groove opening width is multiplied by the number of processing steps corresponding to different gray values ​​of pattern mark 101 to obtain the opening width of the groove to be processed corresponding to different gray values ​​of pattern mark 101.

[0056] It should also be noted that, in this invention, the maximum grayscale value refers to the grayscale level in the pattern identifier 101 that is closer to pure black. For example, among the three grayscale values ​​of 50, 75, and 100, the grayscale value of 50 is closer to pure black. Therefore, in this example, the maximum grayscale value is the grayscale value of 50.

[0057] Combination Figure 7 The advantages of mapping rules will be explained. Figure 7 (a) is a schematic diagram of light rays entering the groove and exiting after reflection. Figure 7 (b) is a schematic diagram of the emission of incident light at the same angle when only the groove depth is adjusted and the opening width is not adjusted. Figure 7(c) To simultaneously adjust the groove depth and opening width so that the groove depth-to-width ratio is... Figure 7 (a) shows a schematic diagram of the exit of light rays incident at the same angle when the aspect ratio is consistent; through Figure 7 As can be seen, adjusting only the opening width or depth can alter the number of reflections and the exit angle of incident light from the same direction, leading to grayscale inaccuracies and affecting the display effect. This solution recognizes the limitations of a single adjustment method by maintaining a constant aspect ratio and adjusting both the groove depth and opening width. This ensures that the number of reflections and the exit angle of light entering the groove remain consistent, guaranteeing accurate grayscale correspondence and achieving a smooth and natural display of pattern identifier 101.

[0058] The ratio of groove depth to opening width corresponding to different grayscale values ​​is a constant value, which is between 1.2 and 2.2. The preset maximum groove depth is 0.25-0.55 mm; or, the preset maximum groove opening width is 0.05-0.5 mm. For example, if this constant value is selected as 1.5, then the depth and opening width of the grooves to be processed corresponding to different grayscale values ​​of pattern identifier 101 are both 1.5. For instance, when the groove depth is 0.3 mm, the corresponding groove opening width is 0.2 mm; when the groove depth becomes 0.24 mm, the corresponding groove opening width is 0.16 mm. Figure 6 As shown, the opening width of the groove to be processed is D, the depth is H, and the depth-to-width ratio is H / D.

[0059] Because the ratio of groove depth to opening width is limited to a certain degree, and there are many grayscale values, the range of opening width and depth is relatively large. If the depth-to-width ratio is too large, the light is reflected too many times, and diffuse reflection becomes the main reflection method. This can easily reduce the contrast between different grayscale values, resulting in a blurred visual perception and affecting the display effect. On the other hand, if the depth-to-width ratio is too small, the depth of the part with smaller grayscale values ​​is too small, which weakens the effect of adjusting light and also reduces the contrast between different grayscale values, resulting in insufficient differentiation and easy loss of details.

[0060] Please see Figure 8 As shown, the cross-section of the groove is V-shaped; or, the cross-section of the groove is approximately V-shaped, and the cross-section of the groove has an inclined surface that slopes outward from bottom to top, and the bottom surface is a plane or an arc surface.

[0061] The mapping rules also include dividing the pattern identifier 101 into different grayscale regions based on its different grayscale values. A portion of the groove to be processed falls into two different grayscale regions, each corresponding to a different grayscale value. The required processing order for this portion of the groove is equal to the average of the required processing orders for the grayscale values ​​in the two grayscale regions. The pattern identifier 101 has several different grayscale values, each corresponding to a different grayscale region. Two adjacent grayscale regions form a boundary. If a groove to be processed falls into one of these two different grayscale regions (i.e., the boundary falls within the opening of the groove), then the required processing order for this portion of the groove is equal to the average of the required processing orders for the two different grayscale values. This allows for a more natural and smooth grayscale transition. For example, as shown... Figure 9 As shown, two adjacent grayscale regions 1012 and 1011 correspond to grayscale values ​​of 50 and 100, respectively. The required processing order for grayscale values ​​of 50 and 100 is 205 and 155, respectively, and the corresponding groove opening widths are D3 and D2, respectively. When the groove to be processed crosses the boundary line of the two grayscale regions, the boundary line falls into part of the groove to be processed. The required processing order for this part of the groove to be processed is 180, and the corresponding groove opening width is D1.

[0062] The pattern identifier 101 is set on the tread of the tire 100, and the projected length of the groove to be processed in the circumferential direction of the tire 100 is greater than the projected length in the axial direction of the tire 100; or, the pattern identifier 101 is set on the sidewall of the tire 100, and the projected length of the groove to be processed in the radial direction of the tire 100 is greater than the projected length in the circumferential direction of the tire 100. It is understood that the groove to be processed at the corresponding position on the tire mold 200 is also set according to this principle; preferably, the ratio of the two projected lengths is 1.2 times or more. When the pattern identifier 101 is processed on a plane, the center lines of its various grooves (taking a V-shaped groove as an example) are usually parallel. However, when it is processed on the tire 100 or the tire mold 200, since both the tread and sidewall of the tire 100 have curvature, during actual processing, the groove needs to conform to the curvature of the tire 100 surface, and the center lines of the various grooves face different angles, which adversely affects the grayscale display of the pattern identifier 101. When the main direction of the groove is set to be basically perpendicular to the line of maximum curvature of the arc surface, different grooves will face different positions along the line of maximum curvature. The curvature changes rapidly, resulting in a rapid change in orientation. Moreover, the light as a whole is deflected towards the observer along the orientation of the groove. The curvature of the tire 100 surface has a very significant impact on the display of the pattern mark 101. However, when the main direction of the groove, that is, the direction with the longest projected length of the groove, is basically parallel to the line of maximum curvature of the arc surface, the impact of the curvature change of the tire 100 surface on the corresponding grayscale display is greatly reduced.

[0063] It should be noted that the circumferential direction of tire 100 refers to the direction around the circumference of tire 100; the axial direction of tire 100 refers to the direction perpendicular to the circumference of tire 100, extending from one sidewall of tire 100 to the other sidewall; and the radial direction of tire 100 refers to the direction extending from the center of tire 100 towards the tread. The tread of tire 100 has an arcuate surface that convexes radially outward, with the line of maximum curvature extending circumferentially along tire 100; the sidewall of tire 100 has an arcuate surface that convexes axially outward, with the line of maximum curvature extending radially along tire 100.

[0064] This solution also provides a tire mold 200, including a tread block 201 and a side plate 202. The tread block 201, the side plate 202 and the steel rim form a vulcanization cavity. Grooves to be processed are processed on the surface of the cavity of the tread block 201 or the side plate 202. The tire 100 is vulcanized using the tire mold 200, so that the pattern mark 101 is displayed on the surface of the tire 100.

[0065] This solution also provides a tire 100, on which corresponding grooves can be directly machined on the surface of the already vulcanized tire 100, thereby displaying pattern markings 101 on the surface of the tire 100; alternatively, a tire mold 200 with grooves can be used to vulcanize the tire 100, thereby displaying pattern markings 101 at the corresponding positions.

[0066] For example, a pattern mark 101 to be processed on the surface of tire 100 has five gray values: 55, 80, 105, 130, and 155. The gray values ​​of the pattern mark 101 are reversed to obtain the processing order corresponding to different gray values ​​of the pattern mark 101. Therefore, the processing order corresponding to the five gray values ​​of 55, 80, 105, 130, and 155 are 200, 175, 150, 125, and 100, respectively. The preset maximum groove depth is 0.50mm, corresponding to the maximum grayscale value of pattern identifier 101, which is 55. The preset maximum groove depth is divided by the number of processing steps required for the maximum grayscale value of pattern identifier 101 to obtain the average groove depth. Therefore, the average groove depth is 0.50 / 200mm, or 0.0025mm. The average groove depth is multiplied by the number of processing steps required for different grayscale values ​​of pattern identifier 101 to obtain the depth of the groove to be processed for different grayscale values ​​of pattern identifier 101. Therefore, the groove depths corresponding to the five grayscale values ​​of pattern identifier 55, 80, 105, 130, and 155 to be processed are 0.50mm, 0.4375mm, 0.375mm, 0.3125mm, and 0.25mm, respectively.

[0067] Next, calculate the corresponding groove opening width based on the groove depth. The ratio of groove depth to opening width for different grayscale values ​​is a constant value. In this example, the ratio is 1.25. Therefore, the groove opening widths corresponding to the five grayscale values ​​of the pattern identifier 55, 80, 105, 130, and 155 are 0.40mm, 0.35mm, 0.30mm, 0.25mm, and 0.20mm, respectively. After processing the groove on the corresponding position on the surface of tire 100 or the corresponding position on tire mold 200, vulcanize tire 100, and display pattern identifier 101 on the surface of tire 100.

[0068] In another example, a pattern mark 101 to be processed on the surface of tire 100 has five gray values: 25, 75, 125, 175, and 225. The gray values ​​of the pattern mark 101 are reversed to obtain the processing order corresponding to different gray values ​​of the pattern mark 101. Therefore, the processing order corresponding to the five gray values ​​of 25, 75, 125, 175, and 225 are 230, 180, 130, 80, and 30, respectively. The preset maximum opening width of the groove is 0.23mm, corresponding to the maximum grayscale value of pattern identifier 101, which is 25. The preset maximum opening width of the groove is divided by the number of processing steps required corresponding to the maximum grayscale value of pattern identifier 101 to obtain the average groove opening width. Therefore, the average groove opening width is 0.23 / 230mm, which is 0.001mm. The average groove opening width is multiplied by the number of processing steps required corresponding to different grayscale values ​​of pattern identifier 101 to obtain the opening width of the groove to be processed corresponding to different grayscale values ​​of pattern identifier 101. Therefore, the groove opening widths corresponding to the five grayscale values ​​of pattern identifier 25, 75, 125, 175, and 225 are 0.23mm, 0.18mm, 0.13mm, 0.08mm, and 0.03mm, respectively.

[0069] Next, calculate the corresponding groove depth based on the groove opening width. The ratio of groove depth to opening width for different grayscale values ​​is a constant value. In this example, the ratio of groove depth to opening width is 2. Therefore, the groove depths corresponding to the five grayscale values ​​of the pattern identifier 25, 75, 125, 175, and 225 are 0.46mm, 0.36mm, 0.26mm, 0.16mm, and 0.06mm, respectively. After processing the groove on the corresponding position on the surface of tire 100 or the corresponding position on tire mold 200, vulcanize tire 100 so that the pattern identifier 101 is displayed on the tire surface.

[0070] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention, such as directly machining grooves on the tire or replicating grooves after machining them on a base mold. Therefore, the invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A smooth color rendering method for displaying a pattern marking on a tire surface, the pattern marking having several grayscale regions corresponding to different grayscale values, characterized in that, Read the grayscale value corresponding to the pattern identifier; The grayscale value of the pattern identifier is reversed to obtain the processing order corresponding to different grayscale values ​​of the pattern identifier; Based on the required processing order, the depth and opening width of the groove to be processed corresponding to different gray values ​​of the pattern identifier are obtained according to the mapping rule. The ratio of the groove depth to the opening width corresponding to different gray values ​​is a constant value. The groove to be processed is processed on the surface of the tire mold, and the tire is vulcanized using the tire mold so that the pattern is displayed on the tire surface. The mapping rules include: calculating or presetting an average groove depth; multiplying the average groove depth by the number of processing steps required for different grayscale values ​​of the pattern identifier to obtain the depth of the groove to be processed corresponding to different grayscale values ​​of the pattern identifier; and calculating the corresponding groove opening width based on the groove depth. The calculation of the average groove depth includes: presetting a maximum groove depth; mapping the preset maximum groove depth to the maximum grayscale value of the pattern identifier; and dividing the preset maximum groove depth by the number of processing steps required for the maximum grayscale value of the pattern identifier to obtain the average groove depth. Alternatively, calculate or preset the average groove opening width, multiply the average groove opening width by the number of processing steps corresponding to different grayscale values ​​of the pattern identifier to obtain the opening width of the groove to be processed corresponding to different grayscale values ​​of the pattern identifier, and calculate the corresponding groove depth based on the groove opening width; the calculation of the average groove opening width includes: preset the maximum groove opening width, and corresponding the preset maximum groove opening width to the maximum grayscale value of the pattern identifier; divide the preset maximum groove opening width by the number of processing steps corresponding to the maximum grayscale value of the pattern identifier to obtain the average groove opening width.

2. The smooth color development method according to claim 1, characterized in that, The ratio of groove depth to opening width corresponding to different grayscale values ​​is a constant value, which is between 1.2 and 2.

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3. The smooth color development method according to claim 1, characterized in that, The maximum depth of the preset groove is 0.25-0.55mm; or, the maximum opening width of the preset groove is 0.05-0.5mm.

4. The smooth color development method according to claim 1, characterized in that, The cross-section of the groove to be processed is V-shaped; Alternatively, the cross-section of the groove to be processed is approximately V-shaped, the cross-section of the groove has an inclined surface, and the bottom surface is a sharp corner, a plane, or an arc surface.

5. The smooth color development method according to claim 1, characterized in that, The mapping rule also includes that the pattern identifier has several grayscale regions corresponding to different grayscale values, and some of the grooves to be processed fall into two different grayscale regions. The required processing order of this part of the grooves to be processed is equal to the average of the required processing order of the corresponding grayscale values ​​of the two grayscale regions.

6. The smooth color development method according to claim 1, characterized in that, The pattern markings are set on the tire tread, and the projected length of the groove to be processed in the tire circumferential direction is greater than the projected length in the tire axial direction. Alternatively, the pattern markings are set on the tire sidewall, and the projected length of the groove to be processed in the radial direction of the tire is greater than the projected length in the circumferential direction of the tire.

7. A tire, characterized in that, The pattern markings are displayed on the tire surface using the smooth color rendering method as described in any one of claims 1-6.

8. A tire mold, characterized in that, Includes tread blocks and side plates for vulcanizing the tire as described in claim 7.

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