3D cut forming blade and vehicle tire

Abstract

An embodiment of the present invention provides a technology for improving durability of a blade used for cut formation at the time of tire vulcanization, thereby minimizing deformation of a cut shape. A 3D cut forming blade according to an embodiment of the present invention, which is provided in a tire vulcanization mold and used for cut formation, includes a frame formed in a plate shape having a wave shape in a cross section horizontal to a thickness direction, and a support portion formed in a bar shape having one side combined with one frame and the other side combined with the other frame.

Description

Technical Field

[0001] This invention relates to a 3D cut-forming blade used in tire vulcanization, and more specifically, to a technique for improving the durability of blades used in cut-forming during tire vulcanization, thereby minimizing deformation of the cut shape. Background Technology

[0002] A pneumatic tire comprises: an inner liner forming the interior of the tire; a carcass laminated on the outside of the inner liner; an annular layer laminated on the outside of the carcass; a tread laminated on the outside of the annular layer; a sidewall forming the two sides of the tire; and a bead bonded to the rim.

[0003] In addition, specific patterns are formed in the tread where it contacts the road surface to improve grip, drainage, braking force, and noise dispersion. The shape of these patterns significantly impacts performance in rain and snow, as well as handling, making this a major factor in tire development. Cutouts are deep grooves, primarily lateral in the tread block, cut deep to create a uniform contact patch and improve grip. They also act as a cushion, providing a comfortable ride. Furthermore, they promote water drainage to increase traction and braking force.

[0004] Recently, the trend in tire tread pattern design has shifted towards a greater emphasis on performance rather than simple design and appearance. For tire performance, pattern performance technology is evolving towards a more segmented and nuanced approach.

[0005] Based on the changes described above, the thickness and shape of the tire kerf have become more diverse in order to improve the dry and wear performance of tires. However, in order to create interlocking between tire blocks during driving, the kerf thickness needs to be thinner, but this results in the following trade-off: while a thinner kerf improves tire dry performance, it reduces performance on snow or ice. Furthermore, a thinner kerf increases the likelihood of kerf bending, breakage, and other damage during tire manufacturing.

[0006] Korean Patent No. 10-1917494 (Title: Cutting Blade for Tire Vulcanizing Mold, Vehicle Tire Using the Blade, and Tire Vulcanizing Apparatus) discloses a cutting blade as follows: In the cutting blade for tire vulcanizing mold, a cutting-forming protrusion 20 is formed in the blade frame 10; a transverse protrusion 30 is formed at the lower part of the cutting-forming protrusion 20; the transverse protrusion 30 includes a transverse groove 40 on its inner side; the cutting-forming protrusion 20 and the transverse protrusion 30 are separated by a predetermined distance from the lower end of the blade frame 10. The lowermost end of the aforementioned lateral protrusion 30 is located at a position 15 to 40% of the height (L) of the blade frame separated from the lower end of the blade frame 10. The height L1 of the lateral protrusion 30 is formed to be 15 to 25% of the height (L) of the blade frame 10, thereby adjusting the block rigidity to improve the grip required for driving on snow and ice. The height L2 from one end of the lateral protrusion 30 to the upper end of the blade frame 10 is formed to be 45 to 60% of the height (L) of the blade frame 10, thereby adjusting the block rigidity to improve driving performance on dry roads.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 0001: Korean Patent No. 10-1917494 Summary of the Invention

[0010] Technical issues

[0011] The object of the present invention for solving the problems described above is to improve the durability of the blade used in the formation of the cut during tire vulcanization, thereby minimizing deformation of the cut shape.

[0012] The technical problems to be solved by this invention are not limited to those mentioned above. Those skilled in the art can clearly understand other technical problems not mentioned from the following description.

[0013] Technical solution

[0014] The present invention, which aims to achieve the above objectives, provides a 3D cut-forming blade, which is disposed in a tire vulcanizing mold and used for cut-forming. It is characterized by comprising: a frame, formed as a plate shape with a corrugated cross-section horizontal to the thickness direction; and a support portion, formed as a strip shape with one side connected to one frame and the other side connected to another frame, wherein deformation of the frame is prevented by the support portion during tire vulcanization.

[0015] In one embodiment of the present invention, the support portion may include: a main support body formed in the shape of a strip; and a connecting body formed between the main support body and the frame to connect the main support body and the frame.

[0016] In one embodiment of the present invention, the cross-section of the main support body can be a circle or a polygon.

[0017] In one embodiment of the present invention, the cross-section of the main support body can be circular, and the radius of the cross-section of the main support body is 0.3 to 1.0 millimeters (mm).

[0018] In one embodiment of the present invention, the connection portion between the main support body and the connecting body can be formed with a curved surface having a predetermined radius of curvature.

[0019] In one embodiment of the present invention, the radius of curvature of the connection portion between the main support and the connecting body can be 0.3 to 1.0 millimeters (mm).

[0020] In one embodiment of the present invention, the outer side of the main support body and the outer plane of the connecting body can be directly connected.

[0021] In one embodiment of the present invention, the frame may have at least one amplitude portion, which is formed as a portion of one surface recessed and a corresponding portion of another surface protruding.

[0022] In one embodiment of the present invention, the frame may further include an inclined portion formed at the connection between the amplitude portion and the support portion.

[0023] In one embodiment of the present invention, the frame may further include a plate-shaped portion, which is combined with the end of the amplitude portion and formed into a plate shape.

[0024] In one embodiment of the present invention, the thickness of the frame can be 0.2 mm or more.

[0025] Invention Effects

[0026] The effects of the present invention based on the structure described above are as follows: a support portion is formed between one frame and another to support each frame, thereby preventing deformation of the frame caused by pressure and heat during tire vulcanization, and increasing the durability of the cutting blade to maintain the cutting shape formed on the tire.

[0027] Furthermore, the effects of the present invention are as follows: As described above, due to the increased durability of the cutting blade, the shape of the cutting blade is maintained during tire vulcanization, thereby minimizing the deformation of the cut shape after tire vulcanization and improving the cut quality of the tire.

[0028] It should be understood that the effects of the present invention are not limited to those described above, but also include all effects that can be inferred from the inventive structure described in the detailed description or claims of the present invention. Attached Figure Description

[0029] Figure 1 This is a perspective view of a blade based on an embodiment of the present invention.

[0030] Figure 2 This is a front view of a blade based on an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the main support and connector based on an embodiment of the present invention.

[0032] Figure 4 This is a perspective view of a block based on an embodiment of the present invention.

[0033] Figure 5 This is a top view of a block based on an embodiment of the present invention.

[0034] Figure 6 This is a side view of a block based on an embodiment of the present invention.

[0035] Figure 7 This is a perspective view of a block based on another embodiment of the present invention.

[0036] Figure 8 This is a side view of a block based on another embodiment of the present invention.

[0037] Figure 9 and Figure 10 These are perspective views of blocks based on comparative examples of the present invention.

[0038] Figure 11 It is a chart based on tests performed on each tire block.

[0039] Figure 12 It is a table that compiles data based on tests performed on each tire block.

[0040] Figures 13A to 15C This is a diagram relating to stress concentration tests on blades based on various embodiments of the present invention.

[0041] Explanation of reference numerals in the attached figures

[0042] 10: Blade; 20, 21, 22: Piece; 30, 31, 32: Cutting edge

[0043] 40: Cut hole; 100: Support part; 110: Main support body; 120: Connector body

[0044] 200: Frame; 210: Amplitude section; 220: Inclined section; 230: Plate-shaped section Detailed Implementation

[0045] The present invention will now be described with reference to the accompanying drawings. However, the present invention can be implemented in various different ways and is not limited to the embodiments described herein. Furthermore, for the purpose of clearly illustrating the present invention, parts unrelated to the description have been omitted in the drawings, and similar reference numerals have been used for similar parts throughout the specification.

[0046] Throughout the specification, the phrase "connected (joined, contacted, combined)" between one part and another includes not only "direct connection" but also "indirect connection" with other components in between. Furthermore, when a part "includes" a certain constituent element, unless otherwise stated, this implies that other constituent elements may also be present, rather than excluding them.

[0047] The terminology used in this specification is for illustrative purposes only and is not intended to limit the invention. Unless the context clearly indicates otherwise, a single expression encompasses multiple expressions. It should be understood that in this specification, terms such as "comprising" or "having" are used to specify the presence of features, numbers, steps, actions, constituent elements, components, or combinations thereof described in the specification, without precluding the presence or additional possibilities of one or more other features or numbers, steps, actions, constituent elements, components, or combinations thereof.

[0048] The present invention will now be described in detail with reference to the accompanying drawings.

[0049] Figure 1 This is a perspective view of the blade 10 based on an embodiment of the present invention. Figure 2 This is a front view of the blade 10 based on an embodiment of the present invention. Furthermore, Figure 3 This is a schematic diagram of the main support 110 and the connector 120 based on an embodiment of the present invention.

[0050] like Figures 1 to 3 As shown, in the 3D cut-forming blade used in the forming of the cut 30 in the tire vulcanization mold, the blade 10 of the present invention includes: a frame 200 having a corrugated shape in the cross section horizontal in the thickness direction and being formed into a plate shape; and a support portion 100 being formed into a strip shape with one side connected to one frame 200 and the other side connected to another frame 200.

[0051] Furthermore, during the vulcanization molding of the tire, deformation of the frame 200 can be prevented by the support portion 100. Here, the thickness of the frame 200 can be 0.2 mm or more. As described above, the frame 200 is made thin, thereby enabling the formation of fine and various shaped cuts 30 in the tire. However, the thickness of the frame 200 is not limited to the dimensions described above.

[0052] As described above, the frame 200 can be made very thin. Due to the thinness of the frame 200, the shape of the cut 30 formed on the tire may be undesirable during tire vulcanization using the present invention due to deformation or damage such as twisting, bending, or breaking of the blade 10 of the present invention.

[0053] To prevent this phenomenon, as described above, a support portion 100 is formed between one frame 200 and another frame 200 to support each frame 200, thereby preventing deformation of the frame 200 caused by pressure and heat during tire vulcanization, which can increase the durability of the blade 10 of the present invention to maintain the shape of the cut 30 formed on the tire.

[0054] Specifically, when a force is applied to the blade 10 which only has a frame 200 using a push-pull gauge, the blade 10 bends under a force of 65 to 70 N. Conversely, when a force is applied to the blade 10 of the present invention which has a support portion 100 as described above using a push-pull gauge, the blade 10 of the present invention may not bend even under a force of 100 N or more.

[0055] The support portion 100 may include: a main support body 110, formed in the shape of a bar; and a connecting body 120, formed between the main support body 110 and the frame 200, connecting the main support body 110 and the frame 200. Here, the cross-section of the main support body 110 may be circular or polygonal. However, the cross-sectional shape of the main support body 110 is not limited to this, and may also be elliptical or other shapes.

[0056] The connector 120 can be formed in a shape that extends from the main support 110 toward the frame 200 on both sides of the main support 110, and such connector 120 can be formed in a plate shape. However, the shape of connector 120 is not limited to this, and connector 120 can also be formed in other shapes.

[0057] The cross-sectional shape of the main support 110 can be formed as a circle, in which case the radius R1 of the cross-section of the main support 110 can be 0.3 to 1.0 millimeters (mm). Furthermore, as... Figure 3 As shown, the connection between the main support 110 and the connector 120 can have a curved surface.

[0058] Specifically, the connection between the main support 110 and the connector 120 can be rounded, so that the thickness T of the connector 120 gradually increases from the connector 120 to the main support 110 and has a curved surface. Thus, the connection between the main support 110 and the connector 120 can be formed into a curved surface with a predetermined radius of curvature R2.

[0059] As described above, by treating the curved surface of the connection between the main support 110 and the connecting body 120, stress concentration at the connection between the main support 110 and the connecting body 120 can be prevented, thereby increasing the durability of the blade 10 of the present invention.

[0060] Here, the radius of curvature R2 of the connection between the main support 110 and the connector 120 can be 0.3 to 1.0 millimeters (mm). As described above, when the cross-sectional radius of the main support 110 is R1 and the radius of curvature of the connection between the main support 110 and the connector 120 is R2, the horizontal resistance of the joint between the main support 110 and the connector 120 increases, thereby increasing the durability of the blade 10 of the present invention.

[0061] For the structure described above, the radius of curvature R2 of the connection between the main support 110 and the connector 120 is formed to be 0.6 mm, preferably 0.5 mm. Furthermore, the thickness T of the connector 120 can be from 0.2 to 0.4 mm.

[0062] In embodiments of the present invention, although the connection portion between the main support 110 and the connector 120 is described as having a curved surface as described above, this is not necessarily the case. The outer surface of the main support 110 and the outer surface of the connector 120 can be directly connected. This also applies when the cross-section of the main support 110 is a circle or other shapes.

[0063] At this time, the connector 120 can be formed in the shape of a plate. The connector 120 extends from the outer side of the main support 110 in the shape of a plate and is formed, so that a straight section can be directly formed from the outer side of the main support 110 to the extension direction of the connector 120.

[0064] By forming the connector 120 as described above, the bonding force between the main support 110 and the frame 200 is increased. The connector 120 is formed in a shape that supports the main support 110. Thus, by forming the connector 120, the resistance of the main support 110 to external forces can be increased.

[0065] With the main support body 110 in the shape of a strip (or rod) and the frame 200 in the shape of a wave, the force, i.e. the extraction force, when the blade 10 of the present invention is introduced into the tire and then pulled out during tire vulcanization may be increased. In addition, the cross-sectional shape of the amplitude portion 210, which forms the wave shape as described above, is formed as a trapezoid, thereby increasing the extraction force mentioned above.

[0066] At this time, as described above, connecting bodies 120 are formed on both sides of the main support body 110. This makes it easier for the plane of the connecting body 120 to slide relative to the tire when the blade 10 of the present invention is separated from the tire after the tire is vulcanized. This reduces the pull-out force increased by the main support body 110 which is in the shape of a strip (or rod), the wave-shaped frame 200, the trapezoidal shape of the amplitude portion 210 as described above, etc., and increases the extraction efficiency of the blade 10 of the present invention that is separated from the tire after the tire is vulcanized.

[0067] The frame 200 may have at least one amplitude portion 210, which is formed such that a portion of one surface is recessed and a corresponding portion of another surface protrudes. Furthermore, an inclined portion 220 may be formed at the connection between the amplitude portion 210 and the support portion 100. Here, the inclined portion 220 may have at least one inclined surface.

[0068] like Figure 1 and Figure 2 As shown, multiple amplitude sections 210 are formed, which form a wave shape, i.e. a Z-shaped amplitude shape, of the frame 200. These amplitude sections 210 are connected to form a wave shape.

[0069] As described above, although the cross-sectional shape of the amplitude portion 210 can be formed as a trapezoid, the cross-sectional shape of the amplitude portion 210 is not limited to this, and can be various shapes such as a semi-circle.

[0070] In the frame 200, the amplitude portion 210 has a wave-like shape, so a gap may be generated between the amplitude portion 210 and the support portion 100. Specifically, a portion that is separated from each other is formed between one end of the amplitude portion 210 that is coupled to the connector 120 and the connector 120, so that an inclined portion 220 can be formed between such a separated portion and the connector 120.

[0071] Here, the inclined portion 220 can be inclined and extended from the amplitude portion 210 toward the connector 120. By forming the inclined portion 220 as described above, the amplitude portion 210 is combined with the connector 120 and there is no part where one end of the amplitude portion 210 is separated from the connector 120. The bonding force between the amplitude portion 210 and the connector 120 is increased, which can increase the shape maintenance force of the blade 10 of the present invention against external forces.

[0072] The frame 200 may also have a plate-shaped portion 230 that is connected to the end of the amplitude portion 210 and formed into a plate shape. Specifically, in the case of Figure 1 and Figure 2 Based on this, a plate-shaped portion 230 can be formed in the lower part of the blade 10 of the present invention, specifically in the lower part of the frame 200.

[0073] As described above, the plate-shaped portion 230 can be attached to the vulcanizing mold for tire vulcanization. Thus, the plane of the plate-shaped portion 230 is attached to the vulcanizing mold for tire vulcanization, thereby increasing the attachment force of the blade 10 of the present invention to the vulcanizing mold for tire vulcanization.

[0074] Furthermore, the support portion 100 extends to the plate-shaped portion 230, so that the main support body 110 and the connecting body 120 also support the plate-shaped portion 230, thereby increasing the bonding force of the blade 10 of the present invention to the vulcanizing mold for tire vulcanization, and also improving the durability of the plate-shaped portion 230, thereby preventing deformation, damage, etc. of the blade 10 of the present invention caused by pressure during vulcanization.

[0075] In the cross-sectional shape of the main support 110, the longest length between one point on the edge and another point on the edge (the diameter when the cross-sectional shape of the main support 110 is circular), that is, the cross-sectional length, can change from the upper end to the lower end of the main support.

[0076] Furthermore, the thickness of the frame 200 can be varied from the upper part to the lower part of the frame 200. Specifically, as... Figure 1 As shown, each part of the frame 200 can be distinguished into regions (L1, L2, L3), and the thickness of the frame 200 can be different in each region.

[0077] Here, the boundary used to distinguish each region may be different from the boundary between the amplitude section 210 described below. That is, even within an amplitude section 210, the thickness may vary from the top to the bottom.

[0078] As a specific embodiment, the thickness of the frame 200 in region L1 can be formed to be 0.3 to 0.4 mm, the thickness of the frame 200 in region L2 can be formed to be 0.2 mm, and the thickness of the frame 200 in region L3 can be formed to be 0.3 to 0.4 mm.

[0079] Furthermore, as described above, the cross-sectional length of the main support 110 can be changed. Specifically, when the main support 110 is cylindrical, the portion of the main support 110 that supports the L2 region formed with a relatively thin thickness can have a diameter of 1 mm or more, while the portions of the main support 110 that support the L1 and L2 regions formed with a relatively thick thickness can have a diameter of 1 mm or less.

[0080] As described above, by making the cross-sectional length of the main support 110 variable and the thickness of the frame 200 variable, the cut 30 formed by the blade 10 of the present invention can be formed in a 3D solid design. As a result, the friction of the cut 30 can be increased while improving various properties, including interlocking performance.

[0081] Figure 4 This is a perspective view of block 20 based on an embodiment of the present invention. Figure 5 This is a top view of block 20 based on an embodiment of the present invention. Figure 6 This is a side view of block 20 based on an embodiment of the present invention.

[0082] like Figures 4 to 8 As shown, a tire formed using the blade 10 of the present invention as described above can include: a block 20 formed on the tread; and a cut 30 formed on the block 20, having a wave-shaped shape extending in the depth direction, and having a cut hole 40 as a hole extending in the depth direction.

[0083] When the blade 10 of the present invention described above is used as a vulcanizing mold to vulcanize a tire, a cut 30 based on the blade 10 of the present invention is formed in the block 20 (or rib), and a hole 40 of the hole shape can be formed in the cut 30 described above through the main support body 110.

[0084] Furthermore, in the cutout 30, a protrusion protruding from the wall of the cutout 30 toward the center of the cutout 30 can be formed by the wave-shaped shape described above, and a recessed part corresponding to the protrusion described above can be formed. When the tire is driving or braking, interlocking occurs when the protrusion and the recessed part contact and engage, which can improve the friction performance of the tire during braking and rotation.

[0085] Figure 7 This is a perspective view of block 20 based on another embodiment of the present invention. Figure 8 This is a side view of block 20 based on another embodiment of the present invention. Here, it can be seen that... Figure 7 and Figure 8 Another embodiment of the present invention shown is Example 1. The thickness of the blade 10 used to form the cut 30 of Example 1 is variable. Specifically, the thickness of the upper region L1 can be 0.3 mm, the thickness of the middle region L2 can be 0.2 mm, and the thickness of the lower region L3 can be 0.3 mm.

[0086] Figure 9 and Figure 10 These are perspective views of blocks based on comparative examples of the present invention.

[0087] Specifically, Figure 9 This is a diagram of block 21 of Comparative Example 1. Compared to block 20 of Example 1, block 21 of Comparative Example 1 has a bent portion at the center of the cut 31 extending from one side of block 21 to the other, and the width of the cut 31 is constant. Here, the amplitude portion can be trapezoidal on the wave-shaped cross-section extending in the depth direction of the cut 31.

[0088] That is, in order to form the cut 31 of block 21 of Comparative Example 1, the support portion 100 can be removed from the blade 10 of the present invention, and the blade has two bending portions and a constant thickness. Here, the thickness of the blade used to form the cut 31 of block 21 of Comparative Example 1 can be constantly set to 0.3 mm.

[0089] Figure 10 The diagram is for block 22 of Comparative Example 2. Compared with block 20 of Example 1, block 22 of Comparative Example 2 can be the shape of block 20 of Example 1 with the notch hole 40 removed.

[0090] That is, in order to form the cut 32 of block 22 of Comparative Example 2, a blade that removes the shape of the support portion 100 from the blade 10 of the present invention can be used. Here, the thickness variation of the blade used to form the cut 32 of block 22 of Comparative Example 2 can be the same as the thickness variation of the blade 10 of Embodiment 1 described above.

[0091] Furthermore, a block for Comparative Example 3 can be prepared. Compared with block 21 of Comparative Example 1, the block for Comparative Example 3 can be a wave-shaped shape that does not extend in the depth direction of the cut and the cut is formed into a flat plate shape.

[0092] That is, in order to form the cut of the block of Comparative Example 3, a flat blade can be used. Here, the thickness of the blade used to form the cut of Comparative Example 3 can be kept constant at 0.3 mm.

[0093] Experimental Example 1

[0094] The block shapes of Example 1 and Comparative Examples 1 to 3 as described above were generated using a finite element analysis program. Each block was then subjected to a load equivalent to the tire ground pressure and moved in the driving direction and the reverse direction, respectively.

[0095] Figure 11 This is a chart showing the tests performed on each tire block. Specifically, Figure 11 It is a graph showing the sliding distance and friction force.

[0096] exist Figure 11 In the diagram, Graph A is a graph for the block of Comparative Example 3, and Graph B is a graph for block 20 of Example 1. It can be confirmed that during the frictional convergence process, the change in the magnitude of the rise varies with the shape of the cut (Kerf).

[0097] The block in Comparative Example 3 is a block with cuts that are used in a typical tire, such as... Figure 11 As shown, as the sliding distance increases, the friction force also increases. The maximum friction force in block 20 of Embodiment 1 using the blade 10 of the present invention is higher than the maximum friction force in block of Comparative Example 3 which has a slit shape used in a conventional tire. Thus, it can be confirmed that the braking performance is improved in a tire using block 20 with a slit 30 formed using the blade 10 of the present invention.

[0098] Experimental Example 2

[0099] The block shapes of Example 1 and Comparative Examples 1 and 2 as described above were generated using a finite element analysis program. Each block was then assigned a load corresponding to the tire contact pressure and moved in the driving direction and the reverse direction, respectively.

[0100] Figure 12 It is a table that compiles the data from tests performed on various tire blocks. Specifically, Figure 12 It is a table that organizes the data exported from [Experimental Example 2]. Figure 12 The table contains data on the coefficient of friction derived from the force generated by the tire during braking and the coefficient of friction derived from the traction force generated by the tire during travel.

[0101] In each table, the maximum friction ratio represents the percentage (%) of the maximum friction of the other comparative examples and Example 1 relative to Comparative Example 1.

[0102] like Figure 12 As shown, it can be confirmed that the friction during braking is improved by 2.3% in the maximum friction of the block 20 with the cut 30 formed by the blade 10 to which the present invention is applied.

[0103] In addition, such as Figure 12 As shown, it can be confirmed that the friction during traction is improved by 1.5% in the maximum friction of the block 20 with the cut 30 formed by the blade 10 to which the present invention is applied.

[0104] Furthermore, after applying the blocks of Comparative Example 1 and Example 1 to actual tires and evaluating them, it was confirmed that the dry braking performance of the block 20 of Example 1 was improved by 6.1%.

[0105] As described above, when the cut 30 is formed in the block 20 using the blade 10 of the present invention, it can be confirmed that the interlocking performance of the cut 30 is also improved, and the tire friction performance is improved by forming the cut 30 with a relatively thin thickness and the design error of the convex and concave portions.

[0106] Figures 13A to 15C This is a diagram relating to stress concentration tests performed on blades based on various embodiments of the present invention.

[0107] Specifically, Figure 13A , Figure 13B , Figure 13C This is a diagram of a simple connecting blade without the rounding treatment described above at the connection between the main support 110 and the connecting body 120. The cross-sectional radius of the main support 110 is 0.5 mm, and the thickness of the frame 200 is 0.3 mm.

[0108] and, Figure 13A This is a diagram for a simple connection of blades. Figure 13B This is an enlarged view of the connection between the main support 110 and the connector 120 in a simple connecting blade. Figure 13C This diagram shows the breakage of the simple connecting blade when a force perpendicular to the surface of the connecting body 120, i.e., a horizontal endurance of 115 N, is applied to the center of the simple connecting blade fixed at both ends. Here, the force perpendicular to the horizontal endurance, i.e., the vertical endurance, is measured to be 32 N.

[0109] Figure 14A , Figure 14B , Figure 14C This is a diagram of the first curvature blade with rounding treatment at the connection between the main support 110 and the connector 120. The cross-sectional radius of the main support 110 is 0.5 mm, the thickness of the frame 200 is 0.3 mm, and the first curvature radius is 0.5 mm.

[0110] and, Figure 14A This is a diagram for the first curvature blade. Figure 14B This is an enlarged view of the connection between the main support 110 and the connecting body 120 in the first curvature blade. Figure 14C This diagram shows the deformation of the first curvature blade when a force perpendicular to the surface of the connector 120, i.e., a horizontal endurance of 125 N, is applied to the center of the first curvature blade, which is fixed at both ends. Here, the force perpendicular to the horizontal endurance, i.e., the vertical endurance, is measured to be 32 N.

[0111] Figure 15A , Figure 15B , Figure 15C This is a diagram of a second curvature blade with a second curvature radius rounded at the connection between the main support 110 and the connector 120. The cross-sectional radius of the main support 110 is 0.6 mm, the thickness of the frame 200 is 0.3 mm, and the first curvature radius is 0.5 mm.

[0112] and, Figure 15A This is a diagram for the second curvature blade. Figure 15B This is an enlarged view of the connection between the main support 110 and the connecting body 120 in the second curvature blade. Figure 15C This diagram shows the deformation of the second curvature blade when a force perpendicular to the surface of the connector 120, i.e., a horizontal endurance of 148 N, is applied to the center of the second curvature blade, which is fixed at both ends. Here, the force perpendicular to the horizontal endurance, i.e., the vertical endurance, is measured to be variable between 38 and 46 N.

[0113] about Figures 13A to 15C The simple connecting blades shown, such as the first curvature blade and the second curvature blade, demonstrate that the improved durability of the blade 10 of the present invention can be confirmed when the connection between the main support 110 and the connecting body 120 is rounded.

[0114] Furthermore, as shown by the comparison between the first curvature blade and the second curvature blade, it can be confirmed that by increasing the cross-sectional radius of the main support 110, the durability of the blade 10 of the present invention is improved.

[0115] It should be understood that the above description of the present invention is illustrative, and those skilled in the art can easily modify it into other specific embodiments without changing the technical concept or essential technical features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, the constituent elements described in a single form can also be implemented separately, and similarly, the constituent elements described in a separate manner can also be implemented in combination.

[0116] The scope of this invention is defined by the claims and should be interpreted as including all modifications or variations derived from the meaning and scope of the claims and their equivalents.

Claims

1. A 3D cutting blade, disposed in a tire vulcanizing mold and used for cutting, characterized in that, include: The frame is formed as a plate shape with a corrugated shape in a cross-section horizontal to the thickness direction; and The support portion is formed as a strip shape, with one side connected to one frame and the other side connected to another frame. It includes a main support body and a connecting body. The main support body is formed as a strip shape, and the connecting body is formed between the main support body and the frame, connecting the main support body and the frame. During the vulcanization process of the tire, the support portion prevents deformation of the frame. The connector is formed as a plate with a straight cross-section horizontal to the thickness direction. The main support body has a circular cross-section with a radius of 0.3 mm to 1.0 mm. The thickness of the frame is 0.2 mm or more.

2. The 3D cutting blade according to claim 1, characterized in that, The connection between the main support and the connector is formed by a curved surface with a predetermined radius of curvature.

3. The 3D cutting blade according to claim 2, characterized in that, The radius of curvature of the connection between the main support and the connector is 0.3 mm to 1.0 mm.

4. The 3D cutting blade according to claim 1, characterized in that, The outer side of the main support is directly connected to the outer plane of the connector.

5. The 3D cutting blade according to claim 1, characterized in that, The frame has at least one amplitude portion, which is formed as a portion of one surface recessed and a corresponding portion of another surface protruding.

6. The 3D cutting blade according to claim 5, characterized in that, The frame also includes an inclined portion formed at the connection between the amplitude portion and the support portion.

7. The 3D cutting blade according to claim 5, characterized in that, The frame also includes a plate-shaped portion, which is combined with the end of the amplitude portion and formed into a plate shape.

8. A vehicle tire, formed using a 3D cutting forming blade according to claim 1, characterized in that, include: Blocks, formed on the tread; and A cut is formed in the block, having a wave-like shape extending in the depth direction, and having a cut hole as a hole extending in the depth direction.

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