A movable tire sipe mold

Abstract

This utility model provides a movable tire sipe mold, including a fixing component, which comprises an upper fixing component and a lower fixing component. The lower fixing component is fixedly installed at the bottom of the upper fixing component. Movable components are slidably connected to both sides of the fixing component. The movable components are used to slide downwards during demolding to reduce the width of the entire sipe mold. After the tire vulcanization is completed, when the mold needs to be pulled out, the movable components on the mold will smoothly slide downwards along the sliding surface of the lower fixing component under the action of extrusion and demolding forces when passing through the narrow section, thereby reducing the width of the original lower part of the mold. This improves the tearing of the tread block edges in the narrow grooves of the teardrop-shaped grooves during demolding, maintains the original design of the tire grooves, and improves the integrity of the tread blocks.

Description

Technical Field

[0001] This utility model relates to the field of tire mold technology, and in particular to a movable tire groove mold. Background Technology

[0002] As the only component of a car that comes into contact with the ground, the performance of tires plays a decisive role in safe driving. Besides their structure and rubber compound, tire performance is primarily determined by different tread patterns. Different tread patterns determine the tire's grip and anti-skid performance, thus identifying the suitable road conditions for the tire.

[0003] In recent years, with changes in the usage environment, tire fuel performance has become increasingly important. To improve tire economy, the stability of the tread blocks is crucial. As a result, various tire sipes have emerged. However, the sipes are generally narrower towards the inside, which greatly reduces the tire's grip and anti-skid performance in the later stages of its lifespan, thus affecting the vehicle's safety performance.

[0004] To address the aforementioned issues, teardrop-shaped or waterdrop-shaped sipes are introduced into the tire tread pattern. These sipes widen as they descend from the tire surface. The tire tread blocks can be simplified as outward-extending cantilever beams. According to material mechanics formulas, the bending deformation of a cantilever beam is proportional to the cube of its length. In the early stages of tire tread development, when the tread is deeper, although the cantilever beam is longer, the narrower sipe width results in minimal relative displacement due to the squeezing and collision between the tread blocks, leading to greater stability. Later, when the tread is shallower and the sipes are wider, there is no contact between the tread blocks, but the shorter cantilever beam maintains high stability and preserves high grip and anti-skid performance even in the later stages of tire life.

[0005] While this type of sipe design can improve the overall performance of the tire, during production, the tire tread pattern is formed by a steel mold. The steel mold has a relatively small deformation. When the tire vulcanization is completed and the mold is being removed, the wider bottom of the sipe mold will exert a greater compressive force on the tread blocks at the narrower part of the sipe as it passes through the narrower upper sipe. The combined effect of the compressive force and the outward demolding force causes the rubber material at the edge of the tread blocks to tear, resulting in a tearing edge phenomenon.

[0006] When the tire surface is torn, it not only affects the tire's appearance, but also increases the distance between the tread blocks in the originally narrower sipes, reducing the stability of the early tread blocks and negating the function of this sipe pattern. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the above-mentioned technology and provide a movable tire groove mold.

[0008] Therefore, this utility model provides a movable tire groove mold, including a fixing member, which includes an upper fixing member and a lower fixing member. The lower fixing member is fixedly connected to the bottom of the upper fixing member, and movable members are slidably connected to both sides of the lower fixing member. The movable members are used to slide downward to reduce the width of the entire groove mold during demolding.

[0009] Preferably, the fixing member has multiple sliding grooves on both sides, and the movable member has multiple sliders fixedly installed on its inner side, the sliders being adapted to slide and connected with the sliding grooves.

[0010] In a further preferred embodiment, the groove is perpendicular to and recessed into the sliding surfaces on both sides of the fixed member, the width of the groove's cross-section on the outer side of the sliding surface is smaller than its inner width, and the slider is perpendicular to and protrudes from the sliding surface of the movable member, the width of the slider's outer cross-section is greater than its inner width.

[0011] Preferably, the number of the slide groove and the slider are equal and both are greater than or equal to 4. The slide groove is an inverted trapezoid or a similar inverted trapezoidal structure, and the fillet value of the connecting edge between its surfaces is greater than or equal to R0.3.

[0012] Preferably, the inner cross-sectional width of the slide groove is greater than or equal to 0.6 mm, the depth of the slide groove is greater than or equal to 0.6 mm, and the depth of the slide groove is less than the minimum vertical distance from the centerline of the fixing member to the sliding surface; the minimum distance from the outer side of the inner lower surface of the slide groove to the bottom of the fixing member is greater than or equal to 2 mm, and the minimum distance from the inner edge of the inner side surface of the slide groove to the left and right sides of the fixing member is greater than or equal to 2 mm; the height of the slider is greater than or equal to 1 mm, the minimum distance from the upper surface of the slider to the top of the movable member is greater than or equal to 2 mm, and the length of the slide groove on the sliding surface is equal to the height of the slider and the distance the movable member slides along the sliding surface.

[0013] Preferably, the lower fixed member and the movable member form an assembly, and the vertical cross-section of the assembly is rectangular, rectangular or circular.

[0014] More preferably, when the vertical cross-section of the assembly is rectangular or quasi-rectangular, the vertical movement distance of the movable part is greater than 1 / 2 of the assembly height and less than 4 / 5 of the assembly height.

[0015] More preferably, the vertical movement distance of the movable part is greater than or equal to the radius of the assembly and less than or equal to 3 / 2 times the radius of the assembly.

[0016] This utility model provides a movable tire cutter groove mold, which has the following beneficial effects:

[0017] (1) During tire vulcanization, the downward movement of the vulcanizing machine drives the tire mold to move horizontally towards the center. The teardrop-shaped sipe mold is embedded in the surface of the tire mold. As the mold moves, the sipe mold presses into the still-softened unvulcanized tire blank. After vulcanization, the tire rubber hardens, forming teardrop-shaped or sipe-shaped sipes that are narrower at the top and wider at the bottom on the tire surface. After the tire vulcanization is complete, the vulcanizing machine moves upward, driving the tire mold to move outward circumferentially. When the teardrop-shaped sipe mold on the outward-moving tire mold passes the narrower part of the upper fixed part, the moving part of the sipe mold will smoothly slide downward along the sliding surface of the lower fixed part under the extrusion force of the vulcanized tread block and the mold extraction force. This reduces the width of the lower part of the sipe mold, reduces tearing of the rubber at the edge of the tread block, minimizes edge tearing, and ensures the stability of the tread block.

[0018] Before the die groove mold is prepared, the specific parameters of the assembly are determined according to the design width and height of the die groove. Given the distance that multiple moving parts move downward along the lower fixed part, the minimum width of the widest horizontal side of the lower fixed part after the moving parts move to the final point is calculated. When the moving parts move to the design position, the width of the lower part of the entire die groove mold assembly is narrowed, and the extrusion pressure on the narrower area of ​​the upper part of the die groove is reduced, thus achieving the minimum design requirements. This avoids the situation where the width of the wider area of ​​the lower part of the die groove mold is much larger than the narrower area of ​​the upper part of the die groove during the horizontal outward movement of the tire mold during demolding. This prevents the rubber material at the upper edge of the tread block from tearing after the mold leaves the tire, which would affect the performance of the product. This achieves the design requirements of a teardrop-shaped or teardrop-shaped die groove. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the movable tire groove mold in Example 1;

[0020] Figure 2 This is a schematic diagram of the longitudinal section of the movable tire sipe mold in Example 1;

[0021] Figure 3 This is a parameter marking diagram of the draft state of the tool groove mold in Example 1;

[0022] Figure 4 This is a parameter marking diagram of the mold closing state of the grooving mold in Example 1;

[0023] Figure 5 This is a schematic diagram of the movable tire groove mold in Example 2;

[0024] Figure 6 This is a schematic diagram of the longitudinal section of the movable tire sipe mold in Example 2;

[0025] Figure 7This is a parameter marking diagram of the draft state of the tool groove mold in Example 2;

[0026] Figure 8 This is a parameter marking diagram of the mold closing state of the tool groove mold in Example 2;

[0027] Figure 9 This is a schematic diagram of the movable tire groove mold in Example 3;

[0028] Figure 10 This is a schematic diagram of the longitudinal section of the slider column of the movable tire cutter groove mold in Example 3;

[0029] Figure 11 This is a schematic diagram of the movable tire groove mold in Example 4.

[0030] The markings in the diagram are: 1. Fixed component; 11. Upper fixed component; 12. Lower fixed component; 2. Moving component; 3. Slide groove; 4. Slider; 5. Slider column; 51. Fixed component slider column; 52. Moving component slider column; 6. Longitudinal wide groove moving component. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0032] Before describing this application in detail, the tool groove will be described in detail first:

[0033] Multiple sipes are distributed on the surface of the tire. The sipes vary in width and can be located laterally or longitudinally. Wider sipes can provide higher traction for the tire, while wider longitudinal sipes can improve the tire's water drainage performance, anti-skid ability, and some traction. Narrower sipes, generally called narrow steel strips, can reduce the rigidity of the tread blocks separated by wider sipes, improve the tire's wet grip, and reduce tire wear.

[0034] Its manifestation is that the tread pattern is formed by the radial force direction from the surface of the tire towards the center of the tire. Different styles of grooves are combined to form the tread pattern. In order to form the tread pattern, a three-dimensional mirror mold of the tread pattern needs to be made first. Then, the tire blank is placed into the vulcanizing machine. The vulcanizing machine moves up and down, which drives the tread pattern mold to move horizontally inward, so that the outer surface of the tire blank is tightly attached to the inner surface of the mold cavity. Then, the three-dimensional tread pattern is mirrored back onto the surface of the tire. Through the cross-linking and curing effect of vulcanization, the tread pattern of the tire is formed.

[0035] Example 1

[0036] like Figure 1 As shown, this utility model provides a movable tire groove mold, including a fixing member 1. The fixing member 1 includes an upper fixing member 11 and a lower fixing member 12. The top of the upper fixing member 11 is fixedly connected to the arc surface of the overall tire mold, and the lower fixing member 12 is fixedly installed on the bottom of the upper fixing member 11. The width of the upper fixing member 11 is smaller than the width of the lower fixing member 12. During manufacturing, the two can be connected by welding, integral casting, or 3D printing. Movable members 2 are also slidably connected to both sides of the fixing member 1. The movable members 2 are used to slide downward to reduce the width of the entire groove mold during demolding.

[0037] In this embodiment, the lower fixing member 12 has a relatively long longitudinal stroke, which allows for sufficient sliding distance after ensuring the minimum size parameters of the sliding groove and the slider. Therefore, the lower fixing member 12 is directly slidably connected to the movable member 2. Multiple sliding grooves 3 can be formed on the lower fixing member 12, with the number of sliding grooves 3 being greater than or equal to 4. Multiple sliders 4 are fixedly installed on the inner side of the movable member 2, and the sliders 4 are adapted to slide and connect with the sliding grooves 3.

[0038] In this embodiment, there are four slides 3 and four sliders 4.

[0039] Furthermore, the groove 3 is perpendicular to and recessed into the sliding surfaces on both sides of the lower fixing member 12. The width of the cross section of the groove 3 located on the outer side of the sliding surface is smaller than the width of its inner side. The slider 4 is perpendicular to and protrudes from the sliding surface of the movable member 2. The width of the cross section of the slider 4 on the outer side is larger than the width of its inner side.

[0040] Furthermore, the slide groove 3 is an inverted trapezoid or a similar inverted trapezoidal structure. While ensuring that the slider 4 moves smoothly along the slide groove 3, the slider 4 is tightly attached to the sliding surface of the lower fixing member 12 when sliding downward, preventing the slider 4 from detaching from the slide groove 3 and enhancing the stability of the connection between the two.

[0041] Furthermore, all the trapezoidal edges of the sliders 4 and the grooves 3 are designed with rounded corners, and the fillet value of the connecting edges between their surfaces is greater than or equal to R0.3, which enhances the smoothness of relative sliding.

[0042] During processing, the inner cross-sectional width of the slide groove 3 is greater than or equal to 0.6 mm, the depth of the slide groove 3 is greater than or equal to 0.6 mm, and the depth of the slide groove 3 is less than the minimum vertical distance from the centerline of the fixed part 1 to the sliding surface; the minimum distance from the outer side of the inner lower surface of the slide groove 3 to the bottom of the fixed part 1 is greater than or equal to 2 mm, and the minimum distance from the inner edge of the inner side surface of the slide groove 3 to the left and right sides of the fixed part 1 is greater than or equal to 2 mm. The height of the slider 4 is greater than or equal to 1 mm, the minimum distance from the upper surface of the slider 4 to the top of the movable part 2 is greater than or equal to 2 mm, and the length of the slide groove 3 on the sliding surface is equal to the height of the slider 4 and the distance the movable part 2 slides along the sliding surface.

[0043] The grooving mold in this embodiment can be applied to all grooving patterns of tire treads, such as longitudinal grooves, transverse grooves, ordinary steel sheets, and three-dimensional steel sheets, which are narrow at the top and wide at the bottom.

[0044] The method for preparing the movable tire sipe mold in this embodiment includes the following steps:

[0045] S1. Determine the parameters of the assembly consisting of the lower fixed part 12 and the movable part 2 based on the width and height of the lower part of the tool groove;

[0046] S2, Given the distance that the movable part 2 moves vertically downward along the lower fixed part 12;

[0047] S3. Calculate the minimum distance of the upper horizontal edge of the lower fastener 12;

[0048] S4. Make the mold based on the calculation results.

[0049] Furthermore, the vertical cross-section of the assembly includes a rectangular or circular structure, but is not limited to these two shapes; it can also be triangular or various irregular combinations of shapes. The two movable parts 2 are arranged symmetrically along the centerline of the lower fixed part 12, or they can be arranged asymmetrically. During molding, the top surface of the movable part 2 is located on the top extended surface of the lower fixed part 12.

[0050] In this embodiment, the movable component 2 is arranged symmetrically along the centerline of the lower fixed component 12.

[0051] like Figure 2 and Figure 4 As shown, when the vertical cross-section of the assembly is a rectangular structure, the width of the assembly is defined as a, the height of the assembly is defined as b, the vertical movement distance of the movable part 2 is defined as e1, the distance of the upper horizontal edge of the lower fixed part 12 is defined as c, and the distance of the upper horizontal edge of the movable part 2 is defined as d; after the movable part 2 moves vertically a distance e1, the horizontal distance of the lower fixed part 12 at the upper horizontal edge d of the movable part 2 is defined as h.

[0052] Since the active component 2 in this embodiment is a symmetrical component, the definition ranges of a and c are both half of the original parameters.

[0053] The calculation process for the minimum distance of the upper horizontal edge of the lower fixing member 12 is as follows:

[0054] (1)

[0055] (2)

[0056] (3)

[0057] Where a, b, and e are design values, calculated by substituting formulas (1) and (2) into formula (3):

[0058]

[0059] In this embodiment, the distance of the upper horizontal edge of the lower fixing member 12 is 2c.

[0060] The movable part 2 can also be an asymmetrical structure. The distance between the upper horizontal edges on both sides of the center line of the lower fixed part 12 is calculated according to the above formula. The sum of the two distances is the width of the upper horizontal edge of the lower fixed part 12.

[0061] Furthermore, the vertical movement distance e1 of the movable part 2 is less than the height b of the assembly, but greater than 1 / 2 of the height b of the assembly. The closer the given value of e1 is to b, the greater the reduction in the horizontal side of the assembly, but this will lead to a decrease in its connection strength. Therefore, the difference between the height b of the assembly and the vertical movement distance e1 of the movable part 2 is greater than 1 / 5 of the height b of the assembly, that is, the vertical movement distance e1 of the movable part 2 is greater than 1 / 2 of the height b of the assembly and less than 4 / 5 of the height b of the assembly.

[0062] The grooving mold can be divided into a working state and a draft state during use. In the working state, the movable part 2 and the fixed part 1 combine to form a grooving with a specific design, which facilitates the forming of teardrop or waterdrop-shaped grooves. In the draft state, as the pattern ring mold moves outward circumferentially, the movable part 2 moves downward along the sliding surface under the action of draft force and material extrusion, gradually reducing the width of the lower assembly. When it reaches a given width, the movable part 2 stops moving, and the width of the lower assembly is reduced by about 1 / 3, which can effectively reduce the extrusion of the upper narrower pattern block by the assembly.

[0063] Example 2

[0064] like Figures 5-8 As shown, the difference between this embodiment and Embodiment 1 lies in the different preparation methods of the movable tire sipe mold. In this embodiment, the vertical cross-section of the assembly is circular, and the radius of the assembly is defined as r; the slope of the sliding surface of the lower fixed part 12 is defined as k; the intersection point of the sliding surface and the assembly is defined as (x, y), where the upper intersection point is (x1, y1) and the lower intersection point is (x2, y2); the vertical distance that the movable part 2 moves along the sliding surface is defined as e2.

[0065] In this embodiment, the movable component 2 is arranged symmetrically along the centerline of the lower fixed component 12.

[0066] The calculation process for the minimum distance of the upper horizontal edge of the lower fixing member 12 is as follows:

[0067] (1)

[0068] (2)

[0069] (3)

[0070] Where r and e are design values, the equations (2) and (3) are combined to obtain:

[0071] (4)

[0072] To ensure that the movable part 2 maintains the maximum retraction distance when it slides down to the set bottom, the widest point of the movable part 2 and the widest point of the lower fixed part 12 must be the same.

[0073] (5)

[0074] By combining formulas (4) and (5), we can obtain:

[0075] (6)

[0076] The slope K of the straight line is calculated using formula (6).

[0077] (7)

[0078] Since the movable part 2 cannot detach from the sliding surface of the lower fixed part 12, the value of k is:

[0079]

[0080] Substituting the value of k into formula (4), we obtain the value of x:

[0081] f∈[r,5 / 2r]

[0082] The larger value is x1, and the smaller value is x2. Since both f and r are design values, the minimum distance on the upper horizontal edge of the lower fastener 12 can be calculated, which is 2. .

[0083] Taking a circle with radius r=2 and a downward position e2=3 as an example,

[0084]

[0085]

[0086]

[0087] Continue to simplify;

[0088] Compared to the original 4mm wide assembly, after the two-stage separation, the width of the original assembly during demolding becomes approximately 2.7mm, a reduction of 13 / 40. This significantly reduces the pressure exerted on the patterned block by the bottom of the assembly when passing through the upper narrow groove during demolding.

[0089] Furthermore, the vertical movement distance e2 of the movable part is greater than or equal to the assembly radius r, and less than twice the assembly radius r. The closer the given value of e2 is to 2r, the greater its reduction, but this will lead to a decrease in its connection strength. Therefore, the difference between twice the assembly radius r and the vertical movement distance e2 of the movable part is greater than or equal to half the assembly radius r, ensuring that when the movable part 2 slides along the sliding surface to the bottom e2 position, it still has a contact surface with the lower fixed part 12. That is, the vertical movement distance e2 of the movable part is less than or equal to three and a half times the assembly radius r.

[0090] Example 3

[0091] like Figures 9-10 As shown, the difference between this embodiment and embodiments 1 and 2 is that the narrow steel sheet in the tire tread has wide grooves on both sides, and the longitudinal height of the lower fixed part 12 is relatively short, so the movable part 2 cannot form a sufficient sliding distance. Therefore, slider posts 5 are set on both sides of the fixed part 1. Slider posts 5 are set at the wide groove positions on both sides of the die groove mold. The slider posts 5 are divided into fixed part slider posts 51 and movable part slider posts 52. The fixed part slider posts 51 and the fixed part 1 are fixedly connected. When the fixed part slider posts 51 and the movable part slider posts 52 are in the vulcanization state, the upper width of the slider posts 5 is greater than or equal to the lower width, and the side is a smooth curved surface. The lower part of the fixed part slider posts 51 and the sliding surface of the lower fixed part 12 of the die groove mold are coplanar. The lower part of the fixed part slider posts 51 is slidably connected to the movable part slider posts 52. The sliding surface of the movable part slider posts 52 and the movable part 2 of the die groove mold are coplanar, and the two are fixedly connected and combined to form a movable part. The movable part is used to slide downward to reduce the width of the combined part when the die is being pulled out.

[0092] In this embodiment, multiple grooves 3 are also provided on the sliding surface of the fixed component slider column 51, and a slider 4 is fixedly installed on the inner side of the movable component slider column 52. The slider 4 is adapted to slide and connect with the grooves 3. There are four grooves 3 and four sliders 4.

[0093] Specifically, in this embodiment, the movable component extends from the left slider post 5 through the lower fixed component 12 to the right slider post 5. During demolding, when the slider 4 on the movable component slider post 52 moves downward along the groove 3 on the left and right fixed component slider posts 51, the movable component 2 will also move downward along the sliding surface of the lower fixed component 12, thereby reducing the top width of the assembly and preventing the edge of the patterned block at the narrower part from tearing.

[0094] Example 4

[0095] like Figure 11As shown, the difference between this embodiment and embodiments 1 and 2 is that when the tire tread does not have wide grooves on both sides of the designed teardrop-shaped groove, and the longitudinal stroke of the lower fixing member 12 is short, it cannot have sufficient sliding distance while ensuring strength. The longitudinal wide groove fixedly connected to the teardrop-shaped groove can be used. The sliding surface of the fixing member 1 extends laterally to the longitudinal wide groove mold. According to the minimum distance requirement of the slide groove 3 and the slider 4, a longitudinal wide groove movable member 6 with sufficient strength is cut from the longitudinal wide groove and fixedly connected to the teardrop-shaped groove movable member 2. The longitudinal wide groove movable member 6 will have 4 new surfaces while maintaining the original external shape of the wide groove. The angle between the surface away from the teardrop-shaped groove and the circumferential vertical line of the tread arc is a positive acute angle. The front surface is coplanar with the sliding surface of the teardrop-shaped groove. The top surface is generally parallel to the tangent of the tread arc surface. The angle between the rear surface and the center line of the teardrop-shaped groove is a positive acute angle, ensuring that the longitudinal wide groove movable member 6 can slide out smoothly when sliding downward. A groove 3 is provided on the sliding surface of the longitudinal wide groove of the mold. A slider 4 is provided on the sliding surface of the longitudinal wide groove movable part 6. The longitudinal wide groove movable part 6 extends to another longitudinal wide groove movable part 6 through the knife groove movable part and is fixedly connected to form a movable part 2. The slider 4 on the movable part 2 is slidably connected to the groove 3.

[0096] During demolding, the slider 4 on the movable part 2 slides downward along the longitudinal groove sliding surface, thereby driving the entire movable part 2 to slide downward along the sliding surface of the lower fixed part 12, reducing the width of the widest point of the assembly and preventing the edge of the patterned block at the narrower part from tearing.

[0097] This application improves the existing grooving mold by designing a parting pattern and using an inverted trapezoidal slider 4 to allow the movable part 2 and the fixed part 1 to slide smoothly without falling off. This parting grooving mold does not require additional power; the relative sliding of the movable part 2 and the fixed part 1 can be completed solely by the mold closing and demolding action. It does not require changing the existing tire mold usage and can greatly improve the tearing phenomenon in the tire production process caused by teardrop or teardrop-shaped grooving designs, thus ensuring product quality.

[0098] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0099] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A movable tire slot mold, comprising a fixing member, characterized in that, The fixing component includes an upper fixing component and a lower fixing component. The lower fixing component is fixedly connected to the bottom of the upper fixing component. Movable components are slidably connected to both sides of the fixing component. The movable components are used to slide downward to reduce the width of the entire die groove when the die is being pulled out.

2. The movable tire groove mold according to claim 1, characterized in that, The fixed component has multiple sliding grooves on both sides, and multiple sliders are fixedly installed on the inner side of the movable component. The sliders are adapted to slide and connect with the sliding grooves.

3. The movable tire groove mold according to claim 2, characterized in that, The groove is perpendicular to and recessed into the sliding surfaces on both sides of the fixed member. The width of the groove's cross-section on the outer side of the sliding surface is smaller than its inner width. The slider is perpendicular to and protrudes from the sliding surface of the movable member. The width of the slider's outer cross-section is greater than its inner width.

4. The movable tire groove mold according to claim 3, characterized in that, The number of the slide grooves and the sliders are equal and greater than or equal to 4. The slide grooves are inverted trapezoidal or similar inverted trapezoidal structures, and the fillet values ​​of the connecting edges between their surfaces are all greater than or equal to R0.

3.

5. A movable tire groove mold according to claim 3, characterized in that, The inner cross-sectional width of the slide groove is greater than or equal to 0.6 mm, the depth of the slide groove is greater than or equal to 0.6 mm, and the depth of the slide groove is less than the minimum vertical distance from the centerline of the fixed member to the sliding surface; the minimum distance from the outer side of the inner lower surface of the slide groove to the bottom of the fixed member is greater than or equal to 2 mm, and the minimum distance from the inner edge of the inner side surface of the slide groove to the left and right sides of the fixed member is greater than or equal to 2 mm; the height of the slider is greater than or equal to 1 mm, the minimum distance from the upper surface of the slider to the top of the movable member is greater than or equal to 2 mm, and the length of the slide groove on the sliding surface is equal to the height of the slider and the distance the movable member slides along the sliding surface.

6. A movable tire groove mold according to claim 1, characterized in that, The lower fixed part and the movable part form a combination, and the vertical cross section of the combination is a rectangular or rectangular structure or a circular or circular structure.

7. A movable tire groove mold according to claim 6, characterized in that, When the vertical cross-section of the assembly is rectangular or quasi-rectangular, the vertical movement distance of the movable part is greater than 1 / 2 of the assembly height and less than 4 / 5 of the assembly height.

8. A movable tire groove mold according to claim 6, characterized in that, The vertical movement distance of the moving part is greater than or equal to the radius of the assembly and less than or equal to 3 / 2 times the radius of the assembly.

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