Tread block repair method and tread block

Abstract

The present application relates to the field of tire mold technology, and in particular to a pattern block repair method and a pattern block, the pattern block repair method comprising the following steps: comparing a standard 3D model with an actual 3D model, determining the caliber of the pattern block to be repaired and / or the pit to be repaired on the vertical seam surface; determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth of the pit to be repaired, determining the filling cladding path of each layer according to the number of cladding layers and the width direction of the pit to be repaired, and determining the boundary cladding path according to the circumferential boundary of the pit to be repaired; filling and cladding the pit to be repaired according to the number of cladding layers, the cladding thickness of each layer, and the filling cladding path of each layer of the pit to be repaired in S4, and performing boundary cladding on the pit to be repaired according to the boundary cladding path of the pit to be repaired in S4. The repair takes a short time and has a high repair quality, which is conducive to making the pattern block have a longer service life.

Description

Technical Field

[0001] The present application relates to the technical field of tire molds, and in particular to a tread block repair method and a tread block. Background Art

[0002] With the popularity of automobiles, the demand for tires is increasing year by year, and the quality requirements for tires are getting higher and higher. Tire molds play a decisive role in the quality of tires. The most widely used tire active molds at present are prone to cavity surface corrosion, caliber and vertical seam surface squeeze, wear and other problems during use, which affect the quality of tires.

[0003] Among them, aluminum pattern blocks, in particular, have the advantages of low density, high specific strength, and good corrosion resistance. However, due to the soft material, deep pits are prone to appear during use. Therefore, repairing the pits of aluminum pattern blocks has become an urgent problem to be solved. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a tread block repair method and a tread block.

[0005] In a first aspect, the present application provides a method for repairing a tread block, comprising the following steps:

[0006] S1. Obtain a standard 3D model of a standard tread block;

[0007] S2, pre-processing the pattern block to be repaired and obtaining the actual 3D model of the pattern block to be repaired;

[0008] S3, comparing the standard 3D model with the actual 3D model to determine the caliber of the tread block to be repaired and / or the pit to be repaired on the vertical seam surface;

[0009] S4, obtaining the maximum depth H of the pit to be repaired, and determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth H of the pit to be repaired; obtaining the width direction of the pit to be repaired, and determining the filling cladding path of each layer according to the number of cladding layers and the width direction of the pit to be repaired; obtaining the circumferential boundary of the pit to be repaired, and determining its boundary cladding path according to the circumferential boundary of the pit to be repaired;

[0010] S5, performing filling cladding on the pit to be repaired according to the number of cladding layers of the pit to be repaired in S4, the cladding thickness of each layer and the filling cladding path of each layer, and performing boundary cladding on the pit to be repaired according to the boundary cladding path of the pit to be repaired in S4, and performing filling cladding first and then boundary cladding;

[0011] S6. Process and repair the caliber and / or vertical seam surface of the pattern block to be repaired to remove excess cladding layer.

[0012] In some embodiments, in S3, determining the pit to be repaired includes:

[0013] Obtain the maximum depression depth H0 of the pit on the caliber and / or vertical seam surface of the pattern block to be repaired, and compare H0 with the set depth h1, h1>0; if H00, if R0≥R, it is determined to be a pit to be repaired, and if R0<R, it is determined to be a lossless pit.<h1>

[0014] In some embodiments, in S4, obtaining the width direction of the pit to be repaired includes:

[0015] The circumferential boundary of the pit to be repaired is obtained, and the direction of the straight line with the longest distance between two points on the circumferential boundary is taken as the length direction of the pit to be repaired, and the direction perpendicular to the length direction is taken as the width direction of the pit to be repaired.

[0016] In some embodiments, in S4, determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth of the pit to be repaired includes:

[0017] Comparing the maximum depth H of the pit to be repaired with the first preset depth H1 and the second preset depth H2, wherein 0

[0018] If H≤H1, the number of cladding layers is 1, and the cladding thickness is H1;

[0019] If H1<H≤H2, the number of cladding layers is 2, and the cladding thickness of the first layer is H1, and the cladding thickness of the second layer is (H2-H1);

[0020] If H>H2, the number of cladding layers is (2+M), M>0, and M is the ratio of ((H-H2) / H3) rounded upward to an integer, H3 is the set thickness, 0<H3<H2; and the cladding thickness of the first layer is H1, the cladding thickness of the second layer is (H2-H1), and the cladding thickness of each of the remaining layers is H3.

[0021] In some embodiments, in S4, determining the filling cladding path of each layer according to the number of cladding layers and the width direction of the pit to be repaired includes:

[0022] Compare the number of cladding layers N with 1. If N=1, the width direction of the pit to be repaired is used as the filling cladding path; if N>1, the width direction of the pit to be repaired is used as the filling cladding path for the first layer, and the filling cladding path of each of the remaining layers is rotated by a preset angle along the same circumferential direction relative to the previous layer.

[0023] ​In some embodiments, the first preset depth H1 is 0.8 mm, the second preset depth H2 is 1.5 mm, and the set thickness H3 is 0.5 mm;

[0024] The preset angle is 50°-89°.

[0025] In some embodiments, in S4, determining a boundary cladding path according to the circumferential boundary of the pit to be repaired includes:

[0026] Determine whether the pit to be repaired is connected to the cavity surface of the pattern block. If so, take the boundary of the pit to be repaired on the caliber or vertical seam surface as a reference and offset a preset distance outward as the boundary cladding path;

[0027] If not, the circumferential boundary of the pit to be repaired is used as the boundary cladding path.

[0028] In some embodiments, in S3, the caliber of the tread block to be repaired and / or all the pits to be repaired on the vertical seam surface are determined;

[0029] In S4, the number of cladding layers, the cladding thickness of each layer, the filling cladding path and the boundary cladding path of each layer of each pit to be repaired are determined;

[0030] In S5, each of the pits to be repaired is clad in turn.

[0031] In some embodiments, between S4 and S5, the method further includes: disposing a protective member outside the boundary cladding path to enclose the pit to be repaired;

[0032] And / or, in S2, pre-processing the tread block to be repaired includes:

[0033] Removing the rubber and high points at the mouth and / or vertical seam surface of the tread block to be repaired, and grinding the pit surface of the pit on the mouth and / or vertical seam surface to make the pit surface flat and smooth without high points and sharp corners;

[0034] Place the tread block to be repaired in a constant temperature environment of 20℃-25℃ for 24h-30h.

[0035] In some embodiments, in S5, laser cladding is used, the laser power is 1500W-2400W, the spot diameter is 4mm, the scanning rate is 800mm / min-1200mm / min, the powder feeding amount is 6g / min-10g / min, the overlap rate is 50%, and the carrier gas flow rate is 8L / min-12L / min;

[0036] And / or, the tread block to be repaired is an aluminum tread block, and the cladding material is AlSi 10 Mg alloy powder.

[0037] In a second aspect, the present application provides a pattern block obtained by repairing the pattern block repair method provided in the first aspect.

[0038] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0039] The pattern block repair method comprises the following steps: S1, obtaining a standard 3D model of a standard pattern block; S2, pre-processing the pattern block to be repaired and obtaining an actual 3D model of the pattern block to be repaired; S3, comparing the standard 3D model with the actual 3D model to determine the caliber of the pattern block to be repaired and / or the pit to be repaired on the vertical seam surface; S4, obtaining the maximum depth H of the pit to be repaired, and determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth H of the pit to be repaired; obtaining the width direction of the pit to be repaired, and determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth H of the pit to be repaired; obtaining the width direction of the pit to be repaired, and determining the number of cladding layers of the pit to be repaired according to the number of cladding layers of the pit to be repaired; The number and width direction of the filling cladding path of each layer are determined; the circumferential boundary of the pit to be repaired is obtained, and the boundary cladding path of the pit to be repaired is determined according to the circumferential boundary of the pit to be repaired; S5, the pit to be repaired is filled and clad according to the number of cladding layers of the pit to be repaired in S4, the cladding thickness of each layer, and the filling cladding path of each layer, and the boundary cladding of the pit to be repaired is performed according to the boundary cladding path of the pit to be repaired in S4, and the filling cladding is performed first and then the boundary cladding; S6, the caliber and / or vertical seam surface of the tread block to be repaired are processed and repaired to remove the excess cladding layer. The pit to be repaired on the tread block to be repaired can be repaired in a short time and with high repair quality, which is conducive to making the tread block have a longer service life and can reduce the problems of reduced production efficiency and increased cost due to frequent damage and repair of the tread block. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] Figure 1 A schematic side view of a tread block to be repaired according to an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the process of the tread block repair method described in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of the cladding path during multi-layer cladding of the pit to be repaired according to the embodiment of the present application;

[0045] Figure 4 A schematic diagram of the length and width directions of a pit to be repaired according to an embodiment of the present application;

[0046] Figure 5 A schematic diagram of the length and width directions of another pit to be repaired according to an embodiment of the present application;

[0047] Figure 6 It is a top view schematic diagram of the vertical seam surface described in the embodiment of the present application;

[0048] Figure 7 for Figure 6 Schematic diagram of the local section along the AA direction.

[0049] Among them, 11, cavity surface; 12, diameter; 13, vertical seam surface;

[0050] 21. First boundary cladding path; 22. Second boundary cladding path. DETAILED DESCRIPTION

[0051] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0053] The present application embodiment provides a method for repairing a pattern block, which mainly repairs the pattern block to be repaired, wherein, referring to Figure 1 The pattern block to be repaired has a cavity surface 11, a vertical seam surface 13 and a diameter 12, wherein the vertical seam surface 13 is connected to the cavity surface 11, and the diameter 12 is connected to the cavity surface 11.

[0054] Specifically, refer to Figure 2 The tread block repair method comprises the following steps:

[0055] S1. Obtain a standard 3D model of a standard tread block;

[0056] S2, pre-processing the pattern block to be repaired and obtaining the actual 3D model of the pattern block to be repaired;

[0057] S3, comparing the standard 3D model with the actual 3D model to determine the caliber of the tread block to be repaired and / or the pit to be repaired on the vertical seam surface;

[0058] S4, obtaining the maximum depth H of the pit to be repaired, and determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth H of the pit to be repaired; obtaining the width direction of the pit to be repaired, and determining the filling cladding path of each layer according to the number of cladding layers and the width direction of the pit to be repaired; obtaining the circumferential boundary of the pit to be repaired, and determining its boundary cladding path according to the circumferential boundary of the pit to be repaired;

[0059] S5, performing filling cladding on the pit to be repaired according to the number of cladding layers of the pit to be repaired in S4, the cladding thickness of each layer, and the filling cladding path of each layer, and performing boundary cladding on the pit to be repaired according to the boundary cladding path of the pit to be repaired in S4, and performing filling cladding first and then boundary cladding;

[0060] S6. Repair the diameter and / or vertical seam surface of the tread block to be repaired and remove the excess cladding layer.

[0061] Among them, the pattern block repair method can determine only the pit to be repaired on the caliber 12 of the pattern block to be repaired, or only the pit to be repaired on the vertical seam surface 13 of the pattern block to be repaired, or simultaneously determine the pit to be repaired on the caliber 12 and the vertical seam surface 13 of the pattern block to be repaired by comparing the standard 3D model of the standard pattern block with the actual 3D model of the pattern block to be repaired. It can be understood that the pit to be repaired on the caliber 12 and / or the vertical seam surface 13 of the pattern block is determined by comparing the standard 3D model of the standard pattern block with the actual 3D model of the pattern block to be repaired. Then, the maximum depth H of the pit to be repaired is obtained, and the number of cladding layers and the cladding thickness of each layer of the pit to be repaired are determined according to the maximum depth H. The width direction of the pit to be repaired is obtained, and the filling cladding path of each layer is determined according to the width defense line of the pit to be repaired; the circumferential boundary of the pit to be repaired is obtained, and its boundary cladding path is determined according to the circumferential boundary of the pit to be repaired. The pit to be repaired is first filled and clad, and then the boundary cladding is performed, so that the pit to be repaired on the tread block to be repaired can be repaired in a short time and with high quality, which is conducive to making the tread block have a longer service life and can reduce the problems of reduced production efficiency and increased cost due to frequent damage and repair of the tread block.

[0062] It should be noted that before cladding the pit to be repaired, the pattern block to be repaired is clamped on the pattern block fixture, and the pattern block to be repaired is fixed through the threaded holes on the back of the pattern block to be repaired to limit the deformation of the pattern block to be repaired during the cladding process. In addition, after the pattern block to be repaired is clamped, the surface to be repaired (caliber 12 or vertical seam surface 13) is horizontally facing upward and horizontal adjustment is performed.

[0063] In some embodiments, in S1, obtaining a standard 3D model of a standard pattern block specifically includes: modeling a standard 3D model using the dimension data of a two-dimensional drawing of the standard pattern block, and the standard 3D model is a 3D model of an undamaged pattern block. In addition, obtaining an actual 3D model of the pattern block to be repaired specifically includes: scanning the pattern block to be repaired using a scanner and forming an actual 3D model, so that the pit to be repaired can be determined and the dimension data of the pit to be repaired can be obtained by comparing the standard 3D model with the actual 3D model.

[0064] In some embodiments, in S1, pre-processing the tread block to be repaired includes:

[0065] The rubber and high points at the caliber 12 and / or the vertical seam surface 13 of the pattern block to be repaired are removed, and the pit surface of the pit on the caliber 12 and / or the vertical seam surface 13 is polished to make the pit surface flat and smooth without high points and sharp corners.

[0066] The rubber is removed by spraying glass beads on the diameter 12 and the vertical seam surface 13 of the pattern block to be repaired. In addition, the diameter 12 and the vertical seam surface 13 are polished with sandpaper, diamond file, oil stone, etc. to remove high points. In this process, the force should be applied evenly to avoid uneven grinding or removing too much material.

[0067] The pit surface is ground because, for example, if the bottom of the pit is a right angle, the cladding is not easy to burn through and affect the cladding quality, so it is necessary to grind it into a chamfer or fillet. For another example, for a V-shaped pit, the sharp corner at the bottom is also not easy to burn through and affect the cladding quality, so it is necessary to grind it into a circular groove with a radius of more than 2mm. Therefore, the coplanar surface of the pit should be ground to make the pit surface flat, smooth, without high points or sharp corners.

[0068] Furthermore, the above process further includes: using compressed air to remove dust and impurities on the surface of the tread block to be repaired, and placing the tread block to be repaired in a constant temperature environment of 20° C.-25° C. for 24 hours-30 hours.

[0069] In some embodiments, in S3, determining the pit to be repaired includes: obtaining the maximum depression depth H0 of the pit on the caliber 12 and / or the vertical seam surface 13 of the tread block to be repaired, and comparing H0 with the set depth h1, h1>0; if H00, if R0≥R, it is determined to be a pit to be repaired, and if R0<R, it is determined to be a lossless pit.<h1>

[0070] It can be understood that by comparing the standard 3D model with the actual 3D model, all the pits on the caliber 12 and the vertical seam surface 13 of the pattern block to be repaired can be determined, but not all pits need to be repaired. For example, if the maximum depression depth H0 of the pit is less than h1, it is considered to be within the tolerance design range of the pattern block, and it is judged that the pit is not caused by damage to the pattern block, that is, this pit is defined as a lossless pit and does not need to be repaired. If the maximum depression depth H0 of the pit is greater than or equal to h1, the circumferential boundary of the pit is further obtained and the equivalent circle diameter R0 is calculated based on it, and the size of R0 and R is compared. If R0 is greater than or equal to R, it is considered that the pit needs to be repaired and is defined as a pit to be repaired. If R0 is less than R, due to the small area of ​​the pit, it can also be ignored and not repaired. At this time, the pit is also defined as a lossless pit.

[0071] Wherein, both h1 and R can be selected as reasonable values ​​according to actual needs. For example, the set depth h1 can be selected as 0.02 mm, and the set diameter R can be selected as 4 mm.

[0072] In some embodiments, in S4, determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth H of the pit to be repaired includes:

[0073] Compare the maximum depth H of the pit to be repaired with the first preset depth H1 and the second preset depth H2, where 0

[0074] If H≤H1, the number of cladding layers is 1, and the cladding thickness is H1;

[0075] If H1<H≤H2, the number of cladding layers is 2, the cladding thickness of the first layer is H1, and the cladding thickness of the second layer is (H2-H1);

[0076] If H>H2, the number of cladding layers is (2+M), M≥N, and M is a positive number, N=((H-H2) / H3), H3 is the set thickness, 0<H3<H2; and the cladding thickness of the first layer is H1, the cladding thickness of the second layer is (H2-H1), and the cladding thickness of each of the remaining layers is H3.

[0077] ​It can be understood that when the maximum depth H≤H1, the number of cladding layers is 1, that is, only one layer is clad, and the cladding thickness is H1. When the maximum depth H1<H≤H2, the number of cladding layers is 2, that is, it is divided into two layers for cladding. At this time, the cladding thickness of the first layer is H1, and the cladding thickness of the second layer is (H2-H1). When the maximum depth H>H2, the number of cladding layers is (2+M), where M≥1, and M is the ratio of ((H-H2) / H3) rounded upward, H3 is the set thickness, and 0<H3<H2; at this time, the number of cladding layers is at least three layers, where the cladding thickness of the first layer is H1, the cladding thickness of the second layer is (H2-H1), and the cladding thickness of each of the remaining layers is H3.

[0078] Among them, (H2-H1)

[0079] For example, the above H1 can be selected as 0.8mm, H2 can be selected as 1.5mm, and H3 can be selected as 0.5mm. In this way, when the number of cladding layers is one, the cladding thickness is 0.8mm. When the number of cladding layers is two, the cladding thickness of the first layer is 0.8mm, and the cladding thickness of the second layer is H2-H1, that is, 0.7mm. When the number of cladding layers exceeds two, the cladding thickness of the first layer is 0.8mm, the cladding thickness of the second layer is 0.7mm, and the cladding thickness of the third layer and each subsequent layer is 0.5mm.

[0080] Of course, the above H1, H2 and H3 can also be selected as other reasonable values ​​according to actual needs, which are not listed here one by one.

[0081] It should be noted that the maximum depth H of the pit to be repaired can be obtained by comparing the standard 3D model with the actual 3D model, such as by detecting or calculating through a computer program.

[0082] In some embodiments, in S4, determining the filling cladding path of each layer according to the number of cladding layers and the width direction of the pit to be repaired includes:

[0083] Compare the number of cladding layers N with 1. If N=1, the width direction of the pit to be repaired is the filling cladding path. If N>1, the width direction of the pit to be repaired is the filling cladding path for the first layer, and the filling cladding path of each of the remaining layers is rotated by a preset angle along the same circumferential direction relative to the previous layer.

[0084] ​Understandably, when the number of cladding layers is only one, the width direction of the pit to be repaired is used as the filling cladding path, that is, a single filling cladding moves along the width direction of the pit to be repaired, and the entire pit is filled from one end to the other end in the length direction of the pit to be repaired. This is because during the cladding process, the increase in the length of a single filling cladding will cause the heat to gradually tighten, causing increased deformation, while the filling path along the width direction of the pit to be repaired can shorten the length of a single filling cladding, thereby reducing deformation.

[0085] When the number of cladding layers exceeds one, the filling cladding path of the second layer rotates clockwise by a preset angle relative to the filling cladding path of the first layer, and the filling cladding path of the third layer rotates clockwise by a preset angle relative to the filling cladding path of the second layer, and so on, so that the filling cladding path will overlap with the filling cladding path of the first layer after the cladding of multiple layers is completed, thereby avoiding the stress accumulation caused by the same cladding path when the number of cladding layers exceeds one, which is beneficial to reduce the deformation of the pattern block. Of course,

[0086] Among them, the above-mentioned preset angle is 50°-89°, preferably 67°. Of course, other reasonable angles such as 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc. can also be selected according to actual needs.

[0087] For example, taking the preset angle of 67° as an example, refer to Figure 3 The cladding path of the first layer Z1 is as shown by the arrow, along the width direction of the pit to be repaired; the cladding path of the second layer Z2 is rotated 67° counterclockwise relative to the cladding path of the first layer Z1, as shown by the arrow, and the cladding path of the third layer Z3 is rotated 67° counterclockwise relative to the cladding path of the second layer Z2, as shown by the arrow.

[0088] For example, in a specific implementation, referring to Figure 4 In S4, obtaining the width direction of the pit to be repaired includes:

[0089] The circumferential boundary of the pit to be repaired is obtained, and the direction of the straight line with the longest distance between two points on the circumferential boundary is taken as the length direction of the pit to be repaired, and the direction perpendicular to the length direction is taken as the width direction of the pit to be repaired. Figure 4 The X direction in the figure, the width direction of the pit to be repaired is as follows Figure 4 in the Y direction.

[0090] It can be understood that the shape of the pit to be repaired may be square, circular, or irregular. In this case, the direction of the straight line with the longest distance between two points on the circumferential boundary of the pit to be repaired is the length direction of the pit to be repaired. That is, the pit to be repaired is defined as having a length, and the length at this time is the maximum value, and the direction perpendicular to the length direction is defined as the width direction of the pit to be repaired.

[0091] It should be noted that when performing filling cladding, each cladding layer needs to be filled and clad multiple times according to its cladding path. At this time, each layer of filling cladding is filled from one end to the other end in the length direction of the pit to be repaired, and the single filling cladding moves according to its cladding path. For example, the filling cladding path of the first layer is the width direction of the pit to be repaired. At this time, the single filling cladding moves along the width direction of the pit to be repaired, from one side of the width direction of the pit to be repaired to the other side until the entire cladding layer is filled. In this process, the length of each filling cladding may be the same or different, depending on the shape of the pit to be repaired.

[0092] In addition, when the pit to be repaired is connected to the cavity surface 11 of the tread block to be repaired, the boundary of the caliber 12 or the vertical seam surface 13 constitutes the circumferential boundary of the pit to be repaired.

[0093] Optionally, in another specific implementation, referring to Figure 5 In S4, the width direction of the pit to be repaired is obtained by obtaining the theoretical circumferential boundary of the first cladding layer, and taking the direction of the straight line with the longest distance between two points on the theoretical circumferential boundary as the length direction of the pit to be repaired, and taking the direction perpendicular to the length direction as the width direction of the pit to be repaired. Figure 5 The X direction in the figure, the width direction of the pit to be repaired is as follows Figure 5 in the Y direction.

[0094] Among them, the theoretical circumferential boundary of the first cladding layer is obtained by the thickness of the first cladding layer and the shape data of the pit to be repaired. For example, a computer simulation is used to perform the first layer of cladding on the pit to be repaired, and the theoretical circumferential boundary of the first cladding layer is calculated. Finally, the direction of the straight line with the longest distance between two points on the theoretical circumferential boundary is determined as the length direction of the pit to be repaired, and the direction perpendicular to the length direction is the width direction of the pit to be repaired.

[0095] In some embodiments, in S4, determining a boundary cladding path according to a circumferential boundary of the pit to be repaired includes:

[0096] Determine whether the pit to be repaired is connected to the cavity surface 11 of the tread block to be repaired. If so, take the boundary of the pit to be repaired on the caliber 12 or the vertical seam surface 13 as the reference, and offset the preset distance outward as the boundary cladding path. If not, take the circumferential boundary of the pit to be repaired as the boundary cladding path.

[0097] Understandably, taking the vertical seam surface 13 as an example, if the pit to be repaired is not connected to the cavity surface 11 of the tread block to be repaired, Figure 6 and Figure 7 For the pit B to be repaired in the embodiment, the circumferential boundary of the pit to be repaired is used as the boundary cladding path, which is defined as the first boundary cladding path 21. At this time, the first boundary cladding path 21 is a closed annular path, which can make up for the problem of low cladding layer thickness caused by the filling cladding path at the circumferential boundary of the pit to be repaired. For example, if the filling cladding path is the width direction of the pit to be repaired, there will be a turning point at the circumferential boundary of the pit to be repaired, which is prone to the problem of low cladding layer thickness at the turning point.

[0098] If the pit to be repaired is connected to the cavity surface 11 of the tread block to be repaired, refer to Figure 6 and Figure 7 For the pit C to be repaired, the boundary of the pit to be repaired on the vertical seam surface 13 is taken as a reference, and a preset distance is offset outward as a boundary cladding path, which is defined as a second boundary cladding path 22. At this time, the second boundary cladding path 22 is a non-closed annular path, thereby increasing the thickness of the cladding layer at the edge position and reducing the undercut problem at the edge of the cavity surface 11, so as to avoid the position where the pit to be repaired is connected to the cavity surface 11 not being repaired in place.

[0099] For example, the preset distance may be 1.7 mm, but other reasonable values ​​may be selected according to actual needs.

[0100] Among them, undercut refers to the phenomenon that when the edge of the pit to be repaired is connected to the cavity surface 11 by cladding, the edge of the cavity surface 11 melts and collapses due to heating, and the molten pool flows to the side of the cavity surface 11, causing the cladding layer here to be located below the reference plane of the vertical seam surface 13 or the diameter 12.

[0101] It should be noted that the circumferential boundary of the above-mentioned pit to be repaired can be obtained by comparing the standard 3D model and the actual 3D model, that is, it can be obtained by calculation using a computer, and the boundary cladding path can be determined by the computer according to the circumferential boundary, thereby controlling the cladding to be performed according to the boundary cladding path during cladding.

[0102] In some embodiments, between S4 and S5, the process further includes: disposing a protective member outside the boundary cladding path to enclose the pit to be repaired.

[0103] It is understandable that when the pit to be repaired is clad, the protective member is used to enclose the pit to be repaired to avoid damage to the parts other than the pit to be repaired. The protective member is made of metal.

[0104] In some embodiments, in S5, laser cladding is used, wherein the laser power is 1500W-2400W, the spot diameter is 4mm, the scanning rate is 800mm / min-1200mm / min, the powder feeding amount is 6g / min-10g / min, the overlap rate is 50%, and the carrier gas flow rate is 8L / min-12L / min.

[0105] In some embodiments, the tread block to be repaired is an aluminum tread block, and the cladding material is AlSi10Mg alloy powder. Specifically, the main components (wt.%) of the AlSi10Mg alloy powder are: Si 9.0%-11.0%, Mg 0.2%-0.5%, Fe 0%-1.0%, Mn0%-0.55%, Ni 0%-0.15%, Cu 0%-0.1%, Ti 0%-0.2%, Pb 0%-0.15%, Zn 0%-0.15%, Sn 0%-0.05%, and Al balance.

[0106] Of course, in other embodiments, if the tread block to be repaired is made of steel, the cladding material may be selected to be Fe-based self-fluxing alloy powder or Ni-based self-fluxing alloy powder.

[0107] In some embodiments, in S6, the caliber and / or the vertical seam surface of the tread block to be repaired is processed and repaired, and before removing the redundant cladding layer, the process further includes:

[0108] Aging treatment includes keeping the tread block to be repaired in an environment of 180°C for 4h-8h.

[0109] In some embodiments, in S3, all the pits to be repaired on the caliber 12 and / or the vertical seam surface 13 of the pattern block to be repaired are determined. In S4, the number of cladding layers, the cladding thickness of each layer, the filling cladding path and the boundary cladding path of each layer of each pit to be repaired are determined. In S5, each pit to be repaired is clad in turn.

[0110] It can be understood that by comparing the standard 3D model of the standard pattern block and the 3D model of the pattern block to be repaired, the pits to be repaired on the caliber 12 and / or the vertical seam surface 13 of the pattern block to be repaired are determined, and the number of cladding layers for each pit to be repaired, the cladding thickness of each layer, the filling cladding path and the boundary cladding path of each layer are determined, and then each pit to be repaired is clad in turn.

[0111] Among them, only the pits to be repaired on the caliber 12 of the pattern block to be repaired and the number of cladding layers of each pit to be repaired, the cladding thickness of each layer, the filling cladding path and the boundary cladding path of each layer can be determined; only the pits to be repaired on the vertical seam surface 13 and the number of cladding layers of each pit to be repaired, the cladding thickness of each layer, the filling cladding path and the boundary cladding path of each layer can be determined; all the pits to be repaired on the caliber 12 and the vertical seam surface 13 and the number of cladding layers of each pit to be repaired, the cladding thickness of each layer, the filling cladding path and the boundary cladding path of each layer can also be determined at the same time.

[0112] Among them, all the pits to be repaired on the caliber 12 of the pattern block to be repaired can be clad first, and then all the pits to be repaired on the vertical seam surface 13 of the pattern block to be repaired can be clad. Of course, the cladding order of the pits to be repaired on the caliber 12 and the vertical seam surface 13 can be selected according to actual needs, such as first cladding all the pits to be repaired on the vertical seam surface 13, and then cladding all the pits to be repaired on the caliber 12.

[0113] Further, in S6, the caliber 12 and / or the vertical seam surface 13 of the pattern block to be repaired are processed and repaired to remove the excess cladding layer. Specifically, there are three cases. The first case, when only the vertical seam surface 13 of the pattern block to be repaired is processed and repaired, includes:

[0114] S611. Rough milling of the vertical seam surface of the pattern block to be repaired, and placing the pattern block to be repaired and the standard mold shell after rough milling in an environment of 20℃-25℃ for 24h-30h.

[0115] S612, install the pattern block to be repaired into the standard mold shell to form a pattern circle, fine-tune the vertical seam surface and trim the total gap of the cutting seam. After the fine-tune is completed, fasten the pattern block to be repaired into the standard mold shell. It is required that the vertical seam gap is uniform, the vertical seam in the middle of the pattern block is consistent in the upper, middle and lower parts, and the verticality of the cutting seam is ≤0.03mm.

[0116] It should be noted that if only one of the tread blocks in the tire mold needs to be repaired, the tread block to be repaired and the other tread blocks that do not need to be repaired (or other standard tread blocks) are placed in the standard mold shell. If at least two tread blocks in the tire mold need to be repaired, all the tread blocks to be repaired and the other tread blocks that do not need to be repaired are placed in the standard mold shell.

[0117] The second case is when only the caliber 12 of the tread block to be repaired is processed and repaired, including:

[0118] S621. Under a constant temperature of 20-25℃, the tread block diameter of the tread block to be repaired is machined and installed in the standard mold shell. The inner hole diameter and cavity width at the tread block diameter are controlled according to the design drawings, and the control tolerance is ±0.03mm.

[0119] In the third case, the caliber 12 and the vertical seam surface 13 of the pattern block to be repaired are processed and repaired. In this case, the caliber 12 can be processed and repaired first, and then the vertical seam surface 13; or the vertical seam surface 13 can be processed and repaired first, and then the caliber 12 can be processed and repaired.

[0120] Furthermore, after the tread block to be repaired is processed and repaired, it is removed from the standard mold shell, the cut seam is trimmed by a fitter, the seam is repaired by a seam repairer, the misalignment of adjacent ribs and the misalignment of the tire top are repaired, and the bumps and cladding defects are repaired as a whole.

[0121] Furthermore, after S6, it also includes:

[0122] S71, installing the repaired pattern block into the standard mold shell, and checking whether there are high points, pits, impurities, etc. on each mating surface during the assembly process;

[0123] S71, whole mold pressure test, detection and adjustment of each matching gap, the matching curve between the pattern block to be repaired and its matching side plate to the process requirements;

[0124] S73, cleaning and assembling the pattern blocks to be repaired, and the repair is completed.

[0125] It should be noted that when only the pit to be repaired on the caliber 12 of the pattern block to be repaired is clad, only the caliber 12 of the pattern block to be repaired needs to be processed and repaired. When only the pit to be repaired on the vertical seam surface 13 of the pattern block to be repaired is clad, only the vertical seam surface 13 of the pattern block to be repaired needs to be processed and repaired. When both the caliber 12 and the vertical seam surface 13 of the pattern block to be repaired are clad, both the caliber 12 and the vertical seam surface 13 of the pit to be repaired need to be processed and repaired.

[0126] The present application also provides a tread block that is repaired using the above-mentioned tread block repair method. The repaired tread block can continue to be used in the original tire mold, avoiding the waste of resources caused by the scrapping of the entire tire mold due to damage to a single tread block, and the repair time period can reduce the impact on the production progress. Moreover, the surface hardness of the repaired tread block is greatly improved, and it has a longer service life under the same working conditions, which can reduce the problem of reduced production efficiency due to frequent damage and repair of the tread block.

[0127] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0128] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for repairing a tread block, characterized in that: The following steps are involved: S1. Obtain a standard 3D model of a standard tread block; S2, pre-processing the pattern block to be repaired and obtaining the actual 3D model of the pattern block to be repaired; S3, comparing the standard 3D model with the actual 3D model to determine the caliber of the tread block to be repaired and / or the pit to be repaired on the vertical seam surface; S4, obtaining the maximum depth H of the pit to be repaired, and determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth H of the pit to be repaired; obtaining the width direction of the pit to be repaired, and determining the filling cladding path of each layer according to the number of cladding layers and the width direction of the pit to be repaired; obtaining the circumferential boundary of the pit to be repaired, and determining its boundary cladding path according to the circumferential boundary of the pit to be repaired; S5, performing filling cladding on the pit to be repaired according to the number of cladding layers of the pit to be repaired in S4, the cladding thickness of each layer and the filling cladding path of each layer, and performing boundary cladding on the pit to be repaired according to the boundary cladding path of the pit to be repaired in S4, and performing filling cladding first and then boundary cladding; S6, processing and repairing the caliber and / or vertical seam surface of the tread block to be repaired, and removing the redundant cladding layer; In S4, determining the boundary cladding path according to the circumferential boundary of the pit to be repaired includes: Determine whether the pit to be repaired is connected to the cavity surface of the pattern block. If so, take the boundary of the pit to be repaired on the caliber or vertical seam surface as a reference and offset a preset distance outward as the boundary cladding path; If not, the circumferential boundary of the pit to be repaired is used as the boundary cladding path.

2. The method for repairing a tread block according to claim 1, characterized in that: In S3, determining the pit to be repaired includes: Obtain the maximum depression depth H0 of the pit on the caliber and / or vertical seam surface of the pattern block to be repaired, and compare H0 with the set depth h1, h1>0; if H0<h1, it is determined to be a lossless pit; if H0≥h1, obtain the circumferential boundary of the pit and calculate its equivalent circle diameter R0, and compare R0 with the set diameter R, R>0, if R0≥R, it is determined to be a pit to be repaired, and if R0<R, it is determined to be a lossless pit.

3. The method for repairing a tread block according to claim 1, characterized in that: In S4, obtaining the width direction of the pit to be repaired includes: The circumferential boundary of the pit to be repaired is obtained, and the direction of the straight line with the longest distance between two points on the circumferential boundary is taken as the length direction of the pit to be repaired, and the direction perpendicular to the length direction is taken as the width direction of the pit to be repaired.

4. The method for repairing a tread block according to claim 1, characterized in that: In S4, determining the number of cladding layers and the cladding thickness of each layer according to the maximum depth of the pit to be repaired includes: Comparing the maximum depth H of the pit to be repaired with the first preset depth H1 and the second preset depth H2, wherein 0<H1<H2; If H≤H1, the number of cladding layers is 1, and the cladding thickness is H1; If H1<H≤H2, the number of cladding layers is 2, and the cladding thickness of the first layer is H1, and the cladding thickness of the second layer is (H2-H1); If H>H2, the number of cladding layers is (2+M), M>0, and M is the ratio of ((H-H2) / H3) rounded upward to an integer, H3 is the set thickness, 0<H3<H2; and the cladding thickness of the first layer is H1, the cladding thickness of the second layer is (H2-H1), and the cladding thickness of each of the remaining layers is H3.

5. The method for repairing a tread block according to claim 4, characterized in that: In S4, determining the filling cladding path of each layer according to the number of cladding layers and the width direction of the pit to be repaired includes: Compare the number of cladding layers N with 1. If N=1, the width direction of the pit to be repaired is used as the filling cladding path; if N>1, the width direction of the pit to be repaired is used as the filling cladding path for the first layer, and the filling cladding path of each of the remaining layers is rotated by a preset angle along the same circumferential direction relative to the previous layer.

6. The method for repairing a tread block according to claim 5, characterized in that: The first preset depth H1 is 0.8 mm, the second preset depth H2 is 1.5 mm, and the set thickness H3 is 0.5 mm; The preset angle is 50°-89°.

7. The method for repairing a tread block according to claim 1, characterized in that: In S3, determining the caliber of the tread block to be repaired and / or all the pits to be repaired on the vertical seam surface; In S4, the number of cladding layers, the cladding thickness of each layer, the filling cladding path and the boundary cladding path of each layer of each pit to be repaired are determined; In S5, each of the pits to be repaired is clad in turn.

8. The method for repairing a tread block according to claim 1, characterized in that: Between S4 and S5, the method further includes: providing a protective member outside the boundary cladding path to enclose the pit to be repaired; And / or, in S2, pre-processing the tread block to be repaired includes: Removing the rubber and high points at the mouth and / or vertical seam surface of the tread block to be repaired, and grinding the pit surface of the pit on the mouth and / or vertical seam surface to make the pit surface flat and smooth without high points and sharp corners; Place the tread block to be repaired in a constant temperature environment of 20℃-25℃ for 24h-30h.

9. The method for repairing a tread block according to claim 1, characterized in that: In S5, laser cladding is used, with a laser power of 1500W-2400W, a spot diameter of 4mm, a scanning rate of 800mm / min-1200mm / min, a powder feeding amount of 6g / min-10g / min, an overlap rate of 50%, and a carrier gas flow rate of 8L / min-12L / min; And / or, the tread block to be repaired is an aluminum tread block, and the cladding material is AlSi 10 Mg alloy powder.

10. A pattern block, characterized in that: Obtained after repairing using the pattern block repair method as described in any one of claims 1 to 9.

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