Movable tire cutter groove mold and preparation method thereof

Abstract

The invention provides a movable tire cutter groove mold which comprises a fixed part, the fixed part comprises an upper fixed part and a lower fixed part, the lower fixed part is fixedly installed at the bottom of the upper fixed part, movable parts are slidably connected to the two sides of the fixed part, and the movable parts are used for sliding downwards to reduce the width of the whole cutter groove mold during mold drawing. After tire vulcanization is completed, when the mold needs to be pulled out, and the movable part on the mold passes through a narrower part, the movable part can smoothly slide downwards along the sliding surface of the lower fixed part under the action of extrusion force and mold pulling force, so that the width of the lower part of the original mold is reduced, the condition that the edge of a pattern block is torn when a narrow groove in a water-drop-shaped groove is pulled out is improved, and the service life of the mold is prolonged. The original design style of the tire groove is kept, and the integrity of the pattern block is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tire mold, in particular to an active tire knife groove mold and a preparation method thereof. BACKGROUND

[0002] Tire is the only part of automobile in contact with the ground, and its various performances have a decisive role on the safe driving of the automobile. The various performances of the tire are mainly embodied by different patterns, which determine the different ground adhesion and the level of anti-skid performance, so as to determine the applicable road conditions of the tire.

[0003] In recent years, with the change of the use environment, the fuel performance of the tire is paid more and more attention, and in order to improve the economy of the tire, the stability of the pattern block is very important. Therefore, various tire knife grooves emerge as the times require, but the performance form of the knife groove is basically narrower and narrower towards the inside, which greatly reduces the ground adhesion and anti-skid performance of the tire in the later period, and further affects the safety performance of the automobile when the tire is used in the later period.

[0004] In order to solve the above problems, a water drop type knife groove or a tear drop type knife groove appears in the tire tread pattern, which is characterized by being wider towards the bottom from the surface of the tire. The tire pattern block can be simplified as a cantilever beam extending outward from the tire, according to the material mechanics formula, the bending deformation of the cantilever beam is proportional to the cube of the length, when the pattern is deep in the early period of the tire, although the length of the cantilever beam is longer, the width of the knife groove is narrow, the pattern blocks are pressed and collided with each other, the relative displacement is small, so the pattern block is more stable; when the pattern is shallow in the later period of the tire, the knife groove of the tire is wide, the pattern blocks have no contact effect, but the cantilever beam is shortened, the pattern block still has high stability, and the tire still has high ground adhesion and anti-skid performance in the later period.

[0005] Although this kind of knife groove form can improve the overall performance of the tire, in the production, the tire pattern is formed by a steel mold, the deformation of the steel mold is small, when the tire is vulcanized and the mold is pulled out, since the bottom of the knife groove mold is wide, when passing through the upper narrow knife groove, a large extrusion force is given to the pattern block at the narrow part of the knife groove, the extrusion force and the pulling force outwardly act together to cause the tearing of the edge rubber of the pattern block, and the tearing edge phenomenon is formed.

[0006] When the surface of the tire is torn, not only the appearance of the tire is affected, but also the distance between the pattern blocks of the originally narrow knife groove is increased, the stability of the pattern block in the early period is reduced, and the effect of this kind of knife groove pattern is lost. SUMMARY

[0007] The present application aims to solve the above technical problems, and provides an active tire knife groove mold and a preparation method thereof.

[0008] To this end, the application provides a movable tire knife groove mold, comprising a fixed part, the fixed part comprising an upper fixed part and a lower fixed part, the lower fixed part being fixedly connected to the bottom of the upper fixed part, and two sides of the lower fixed part being slidingly connected with a movable part, the movable part being used to slide downward to reduce the width of the entire knife groove mold during mold stripping.

[0009] Preferably, the two sides of the fixed part are provided with a plurality of sliding grooves, and the inner side of the movable part is fixedly provided with a plurality of sliding blocks, the sliding blocks being slidingly connected with the sliding grooves.

[0010] Further preferably, the sliding grooves are perpendicular and recessed on the sliding surface of the two sides of the fixed part, the width of the cross section of the sliding groove outside the sliding surface is smaller than that inside the sliding surface, the sliding blocks are perpendicular and protrude on the sliding surface of the movable part, and the width of the cross section of the sliding block outside is greater than that inside.

[0011] Preferably, the number of the sliding grooves and the sliding blocks is equal and greater than or equal to 4, the sliding grooves are inverted trapezoidal or similar inverted trapezoidal structures, the connecting edges of the faces are rounded with a value greater than or equal to R0.3, the inner cross section width of the sliding groove is greater than or equal to 0.6mm, the depth of the sliding groove is greater than or equal to 0.6mm and the depth of the sliding groove is smaller than the minimum vertical distance from the center line of the fixed part to the sliding surface, the minimum distance from the outer side of the inner lower surface of the sliding groove to the bottom of the fixed part is greater than or equal to 2mm, the minimum distance from the inner side of the side surface of the sliding groove to the left and right sides of the fixed part is greater than or equal to 2mm, the height of the sliding block is greater than or equal to 1mm, the minimum distance from the upper surface of the sliding block to the top of the movable part is greater than or equal to 2mm, and the length of the sliding groove on the sliding surface is equal to the height of the sliding block and the distance of the movable part sliding along the sliding surface.

[0012] A preparation method of a movable tire knife groove mold, comprising the following steps:

[0013] S1, determining the parameters of the combined part composed of the lower fixed part and the movable part according to the width and height of the lower part of the knife groove;

[0014] S2, giving the distance of the movable part vertically moving downward along the lower fixed part, and after reaching the moving distance, the lower part of the movable part is in contact;

[0015] S3, calculating the minimum distance of the horizontal side of the widest part in the lower fixed part

[0016] S4, manufacturing the mold according to the calculation result.

[0017] Preferably, the vertical cross section of the combined part comprises a rectangular, similar rectangular structure and a circular, similar circular structure.

[0018] The calculation formula of the minimum distance of the horizontal transverse edge of the lower fixing member on the left side or the right side of the upper fixing member with a rectangular or similar rectangular structure is preferably:

[0019] ;

[0020] Wherein, the distance between the left side or the right side of the combination member and the center line of the upper fixing member is defined as a, the height of the combination member is defined as b, the vertical moving distance of the movable member is defined as e1, and the distance between the horizontal transverse edge of the widest part of the lower fixing member and the center line of the upper fixing member is defined as c.

[0021] Preferably, the vertical moving distance e1 of the movable member is less than 4 / 5 of the height b of the combination member and greater than 1 / 2 of the height b of the combination member. The calculation formula of the minimum distance of the horizontal transverse edge of the lower fixing member on the left side or the right side of the upper fixing member with a circular or similar circular structure is preferably:

[0022] , f∈[r, 5 / 2r]

[0023] Wherein, the half of the widest horizontal distance in the combination member is defined as the radius r, the vertical moving distance of the movable member is defined as e2, the sum of the radius of the combination member and the vertical moving distance of the movable member is defined as f, and the distance between the horizontal transverse edge of the widest part of the lower fixing member and the center line of the upper fixing member is defined as x.

[0024] Preferably, the vertical moving distance e2 of the movable member is greater than or equal to the radius r of the combination member and less than or equal to 3 / 2 times the radius r of the combination member.

[0025] The present application provides a movable tire knife groove mold and a preparation method thereof, which has the following beneficial effects:

[0026] (1) When the tire is vulcanized, the tire mold is moved along the circumferential horizontal direction to the center by the downward movement of the vulcanizing machine, and the water droplet-shaped knife groove mold is embedded on the surface of the tire mold. As the mold moves, the knife groove mold will press into the unvulcanized tire embryo which is still in a softened state. After the tire is vulcanized, the tire rubber becomes hard, thereby forming a water droplet-shaped or tear drop-shaped knife groove with a narrow upper part and a wide lower part on the surface of the tire. After the tire vulcanization is completed, the vulcanizing machine moves upward and moves the tire mold outward along the circumferential direction. When the water droplet-shaped knife groove mold on the outward moving tire mold passes through the narrower part of the upper fixing member, the movable member of the knife groove mold will smoothly slide downward along the sliding surface of the lower fixing member under the extrusion force of the vulcanized pattern block and the mold pulling force, thereby reducing the width of the lower part of the knife groove mold, reducing the tearing of the rubber at the edge of the pattern block, reducing the tearing phenomenon, and ensuring the stability of the pattern block.

[0027] 2. Before the preparation of the sipe mold, according to the designed width and height of the sipe, the specific parameters of the assembly are determined, the distance of the plurality of movable members moving downward along the lower fixed member is given, and the minimum width of the horizontal transverse edge at the widest part of the lower fixed member after the movable member moves downward to the final point is calculated. When the movable member moves to the designed position, the width of the lower part of the sipe mold assembly is reduced, the extrusion force on the upper narrow area of the sipe is reduced, and the minimum design requirement is achieved. The width of the lower wide area of the sipe mold during the horizontal outward circumferential movement of the tire mold during the stripping process is much larger than that of the upper narrow area of the sipe, so that the tearing of the rubber at the upper edge of the pattern block after the mold is separated from the tire does not affect the service performance of the product, thereby achieving the design requirement of the water droplet-shaped sipe or tear droplet-shaped sipe. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of the movable tire sipe mold in Example 1;

[0029] Figure 2 is a structural schematic diagram of the longitudinal section of the movable tire sipe mold in Example 1;

[0030] Figure 3 is a parameter marking diagram of the sipe mold in the stripping state in Example 1;

[0031] Figure 4 is a parameter marking diagram of the sipe mold in the closed state in Example 1;

[0032] Figure 5 is a structural schematic diagram of the movable tire sipe mold in Example 2;

[0033] Figure 6 is a structural schematic diagram of the longitudinal section of the movable tire sipe mold in Example 2;

[0034] Figure 7 is a parameter marking diagram of the sipe mold in the stripping state in Example 2;

[0035] Figure 8 is a parameter marking diagram of the sipe mold in the closed state in Example 2;

[0036] Figure 9 is a structural schematic diagram of the movable tire sipe mold in Example 3;

[0037] Figure 10 is a structural schematic diagram of the longitudinal section of the movable tire sipe mold in Example 3;

[0038] Figure 11 is a structural schematic diagram of the movable tire sipe mold in Example 4.

[0039] Marked in the figure: 1, fixed part; 11, upper fixed part; 12, lower fixed part; 2, movable part; 3, sliding groove; 4, sliding block; 5 sliding block column; 51, fixed part sliding block column; 52, movable part sliding block column; 6, longitudinal wide groove movable part. DETAILED DESCRIPTION

[0040] The present application will be further described below in conjunction with the drawings and specific examples to help understand the content of the present application. The methods used in the present application are conventional methods unless otherwise specified; the raw materials and devices used are conventional commercially available products unless otherwise specified.

[0041] Before the detailed description of the present application, the sipes are specifically described:

[0042] A plurality of sipes are distributed on the surface of the tire, and the sipes have different shapes, and the distribution positions can be transverse or longitudinal. The transversely wide sipes can provide higher driving force for the tire, and the longitudinally wide sipes can improve the drainage performance and anti-skid force of the tire and a certain driving force. The narrow sipes, generally called narrow steel sheets, can reduce the rigidity of the blocks separated by the wide sipes, improve the wet grip ability of the tire, and reduce the occurrence of tire uneven wear.

[0043] The performance form is that the sipes are recessed from the radial force direction of the tire surface to the center of the tire. Different styles of sipes are combined to form the pattern style of the tire. To form the pattern style of the tire, a three-dimensional mirror image mold of the pattern style is first made, then the tire blank is placed in the internal part of the vulcanizing machine, the pattern ring mold is driven to move horizontally inward by the up-down movement of the vulcanizing machine, the outer surface of the blank is tightly fitted in the inner surface of the mold cavity, and then the three-dimensional pattern style is reversely imaged to the surface of the tire. Through the cross-linking curing effect of vulcanization, the pattern style of the tire is formed.

[0044] Example 1

[0045] As shown in Figure 1 The present application provides a movable tire sipe mold, which comprises a fixed part 1, the fixed part 1 comprises an upper fixed part 11 and a lower fixed part 12, the top of the upper fixed part 11 is fixedly connected with the arc surface of the whole tire mold, the lower fixed part 12 is fixedly installed at the bottom of the upper fixed part 11, and the width of the upper fixed part 11 is smaller than the width of the lower fixed part 12. The connection mode of the two during production can be welding, one-piece casting or 3D printing production. The two sides of the fixed part 1 are also slidably connected with a movable part 2, and the movable part 2 is used to slide downward to reduce the width of the whole sipe mold during mold removal.

[0046] The longitudinal stroke of the lower fixing member 12 in this embodiment is long enough to have sufficient sliding distance after ensuring the minimum size parameters of the sliding groove and the sliding block, so the lower fixing member 12 is directly connected with the movable member 2 in sliding mode. A plurality of sliding grooves 3 can be provided on the lower fixing member 12, and the number of the sliding grooves 3 is greater than or equal to 4; a plurality of sliding blocks 4 are fixedly installed on the inner side of the movable member 2, and the sliding blocks 4 are connected with the sliding grooves 3 in sliding mode.

[0047] In this embodiment, the number of the sliding grooves 3 and the sliding blocks 4 is four.

[0048] Further, the sliding grooves 3 are perpendicular and recessed on the sliding surface on both sides of the lower fixing member 12, the width of the cross section of the sliding groove 3 on the outer side is less than that on the inner side, the sliding blocks 4 are perpendicular and protrude on the sliding surface of the movable member 2, and the width of the cross section of the sliding block 4 on the outer side is greater than that on the inner side.

[0049] Further, the sliding grooves 3 are in inverted trapezoidal or similar inverted trapezoidal structure, which makes the sliding blocks 4 closely fit on the sliding surface of the lower fixing member 12 when sliding downward, prevents the sliding blocks 4 from separating from the sliding grooves 3, and enhances the stability of the connection between the two.

[0050] Further, the trapezoidal edges of all the sliding blocks 4 and the sliding grooves 3 are designed with rounded corners, and the rounded corner values of the connecting edges of the surfaces are greater than or equal to R0.3, which enhances the smoothness when sliding relative to each other.

[0051] When processing, the inner side cross section width of the sliding groove 3 is greater than or equal to 0.6 mm, the depth of the sliding groove 3 is greater than or equal to 0.6 mm, and the depth of the sliding groove 3 is less than the minimum vertical distance from the center line of the fixing member 1 to the sliding surface; the minimum distance from the outer side of the inner lower surface of the sliding groove 3 to the bottom of the fixing member 1 is greater than or equal to 2 mm, and the minimum distance from the inner side surface of the sliding groove 3 to the left and right sides of the fixing member 1 is greater than or equal to 2 mm. The height of the sliding block 4 is greater than or equal to 1 mm, the minimum distance from the upper surface of the sliding block 4 to the top of the movable member 2 is greater than or equal to 2 mm, and the length of the sliding groove 3 on the sliding surface is equal to the height of the sliding block 4 and the distance of the movable member 2 sliding along the sliding surface.

[0052] The knife groove mold in this embodiment can be applied to longitudinal grooves, transverse grooves, ordinary steel sheets, three-dimensional steel sheets and all other tire patterns with narrow upper part and wide lower part.

[0053] The preparation method of the movable tire knife groove mold in this embodiment includes the following steps:

[0054] S1, according to the width and height of the lower part of the knife groove, the parameters of the combined member composed of the lower fixing member 12 and the movable member 2 are determined;

[0055] S2, the distance of the movable member 2 vertically moving downward along the lower fixing member 12 is given;

[0056] S3. Calculate the minimum distance of the upper horizontal edge of the lower fastener 12;

[0057] S4. Make the mold based on the calculation results.

[0058] 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.

[0059] In this embodiment, the movable component 2 is arranged symmetrically along the centerline of the lower fixed component 12.

[0060] 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.

[0061] 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.

[0062] The calculation process for the minimum distance of the upper horizontal edge of the lower fixing member 12 is as follows:

[0063] (1)

[0064] (2)

[0065] (3)

[0066] Where a, b, and e are design values, calculated by substituting formulas (1) and (2) into formula (3):

[0067]

[0068] In this embodiment, the distance of the upper horizontal edge of the lower fixing member 12 is 2c.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Example 2

[0073] like Figures 5 to 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.

[0074] In this embodiment, the movable component 2 is arranged symmetrically along the centerline of the lower fixed component 12.

[0075] The calculation process for the minimum distance of the upper horizontal edge of the lower fixing member 12 is as follows:

[0076] (1)

[0077] (2)

[0078] (3)

[0079] Where r and e are design values, the equations (2) and (3) are combined to obtain:

[0080] (4)

[0081] 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.

[0082] (5)

[0083] By combining formulas (4) and (5), we can obtain:

[0084] (6)

[0085] The slope K of the straight line can be calculated using formula (6).

[0086] (7)

[0087] Since the movable part 2 cannot detach from the sliding surface of the lower fixed part 12, the value of k is:

[0088]

[0089] Substituting the value of k into formula (4), we obtain the value of x:

[0090] f∈[r,5 / 2r]

[0091] 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. .

[0092] Taking a circle with radius r=2 and a downward position e2=3 as an example,

[0093]

[0094]

[0095]

[0096] Continue to simplify;

[0097] 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.

[0098] 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.

[0099] Example 3

[0100] like Figures 9 to 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.

[0101] 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.

[0102] 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.

[0103] Example 4

[0104] 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.

[0105] 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.

[0106] 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.

[0107] In the description of this invention, 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 invention 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 invention.

[0108] However, the above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention should still fall within the scope of the claims of the present invention.

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. 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.

5. A method for preparing a movable tire sipe mold, characterized in that, Includes the following steps: S1. Determine the parameters of the assembly consisting of the lower fixed part and the moving part based on the width and height of the lower part of the tool groove; S2. Given the distance the movable part moves vertically downward along the lower fixed part, the lower parts of the movable parts will contact each other after the moving part reaches the moving distance; S3. Calculate the minimum distance of the widest horizontal side in the lower fastener; S4. Make the mold based on the calculation results.

6. The method for preparing a movable tire sipe mold according to claim 5, characterized in that, The vertical cross-section of the assembly includes rectangular, rectangular-like structures, and circular, circular-like structures.

7. The method for preparing a movable tire grommet mold according to claim 6, characterized in that, The formula for calculating the minimum distance between the widest horizontal side of the lower fastener on the left or right side of the centerline of the upper fastener (which has a rectangular or rectangular cross-section) is as follows: ； The distance between the left or right side of the assembly and the centerline of the upper fixed part is defined as a, the height of the assembly is defined as b, the vertical movement distance of the moving part is defined as e1, and the distance between the widest horizontal edge of the lower fixed part and the centerline of the upper fixed part is defined as c.

8. The method for preparing a movable tire groove mold according to claim 7, characterized in that, The vertical movement distance e1 of the movable part is greater than 1 / 2 of the assembly height b and less than 4 / 5 of the assembly height b.

9. The method for preparing a movable tire sipe mold according to claim 6, characterized in that, The formula for calculating the minimum distance between the widest horizontal side of the lower fastener on the left or right side of the centerline of the upper fastener with a vertical cross-section that is circular or near-circular is as follows: ，f∈[r,5 / 2r] Among them, half of the widest horizontal distance in the assembly is defined as the radius r, the vertical movement distance of the moving part is defined as e2, the sum of the assembly radius and the vertical movement distance of the moving part is defined as f, and the distance between the widest horizontal edge of the lower fixed part and the centerline of the upper fixed part is defined as x.

10. The method for preparing a movable tire grommet mold according to claim 9, characterized in that, The vertical movement distance e2 of the moving part is greater than or equal to the radius r of the assembly, and less than or equal to 3 / 2 times the radius r of the assembly.

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