KR100869314B1 - Tire mold having nickel reinforcement and repairing method thereof - Google Patents

Abstract

A tire mold having nickel reinforcement extending service life of a mold and repairing method thereof is provided to prevent deformation of a mold and then improve reliability by repairing a tire mold in short time at relatively low temperature. A tire mold comprises a tread which forms thread of tire; top and lower projections(130) protruded to the top and lower part of tread; and a side joining part(140,150) meeting at right angle on both ends of the upper and lower projections. The nickel reinforcement comprises the top and lower projections; an isosceles of 8mm through 10mm of length formed on the same plane as the side joining part; one side equipped with bottom formed on the same plane as the tread; and a vertex faced by 2mm through 3mm from one side.

Description

Tire mold with nickel reinforcement and repair method thereof {TIRE MOLD HAVING NICKEL REINFORCEMENT AND REPAIRING METHOD THEREOF}

The present invention relates to a tire mold having a nickel reinforcement portion and a repair method thereof, and more particularly, nickel alloy powder is deposited by a low temperature spray method on a triangular portion adjacent to a tread portion and an upper or lower protrusion portion and a side junction portion to reinforce a nickel reinforcement portion. The present invention relates to a tire mold having a nickel reinforcing portion having improved nickel reliability by improving the hardness of the tire mold by improving its hardness and repairing the tire mold in a short time at a relatively low working temperature, thereby improving reliability.

In general, tire molds include upper and lower side molds spaced apart from each other on top and bottom, and a plurality of split molds disposed in a circle between them. The upper side mold, the lower side mold and the plurality of split molds are assembled in a cylindrical jig for forming the tire, and the plurality of split molds formed to be divided vertically with respect to the circumferential direction have a tread portion forming the tread of the tire. It is arranged in a circle to form a.

Referring to Figure 1, a perspective view showing a split mold of a conventional tire mold is shown.

As shown in FIG. 1, a conventional tire mold 10 is formed on a tread portion 11 for forming a tread of a tire, and an upper side mold and an upper side mold (not shown), respectively, on the upper and lower portions of the tread portion 11. And upper and lower protrusions 12 and 13 contacting the lower side mold (not shown), and side joints 14 formed on both sides of the tread part 11 to be in contact with other adjacent molds (not shown). , 15).

The tire mold 10 is closely assembled so that the upper and lower side molds and the split molds and the raw materials of the tires do not precipitate when assembled to the cylindrical jig for vulcanization of the tires. However, the tire mold 10 is prone to wear on the surfaces of the upper and lower protrusions 12 and 13 and the side joints 14 and 15 according to tens or hundreds of tire vulcanization operations. In particular, the triangular portion T1, which the tread portion 10, the upper and lower protrusion portions 12 and 13 and the side joint portions 14 and 15 contact, has a structure that stress is concentrated when the tire mold 10 is stored and used. It is the worst part. As such, when the tire mold 10 is worn, a gap is generated between adjacent molds, and thus raw materials of the tire are easily precipitated as a gap, which reduces the manufacturing yield of the tire. Accordingly, the tire mold 10 prevents defects caused by the precipitation of raw materials through regular repair work.

Conventionally, TIG (Tungsen Insert Gas Welding) method, which deposits a certain thickness of aluminum on a worn surface and then maps it, is mainly used, but since TIG welding requires a working temperature close to 700 ° C, the mold is not exposed to heat. Deformation such as expansion or warpage is easy to occur, and there are risk factors such as high temperature and explosion due to the use of gas such as argon, so that the working conditions are difficult. Since the thickness ranges from about 5 mm to 8 mm, it takes more than one day to repair the mold, which requires precise dimensions of less than 1 mm, and more than three days for finishing. There is a long problem.

On the other hand, the reinforcement portion is formed in the triangular portion (T1) of the conventional tire mold 10 by the above-described TIG welding method, or repaired by forming a reinforcing steel material relatively hard compared to the base material. However, the method of reinforcing the triangular portion (T1) with cast steel has a problem that the repair method is complicated, and the repair of the precise dimension is difficult as in the above-described TIG welding method.

The present invention is to solve the above-mentioned conventional problems, in particular, by depositing nickel alloy powder by a low-temperature spray method on the triangular portion in contact with the tread portion and the upper or lower protrusions and the side junctions to form a nickel reinforcement to increase the hardness It is an object of the present invention to provide a tire mold and a repair method thereof in which the life of the mold is improved.

In addition, another object of the present invention is to provide a tire mold and a repair method thereof, in which a deformation of the mold is prevented by repairing the tire mold in a short time at a relatively low working temperature, thereby improving reliability.

According to the present invention, a tread portion 110 forming a tread of a tire, upper and lower protrusions 120 and 130 protruding from the upper and lower portions of the tread portion 110, the tread portion 110 and the upper portion and In the tire die 100 having side joints 140 and 150 orthogonal to both ends of the lower protrusions 120 and 130, wear of the upper and lower protrusions 120 and 130 and the side joints 140 and 150 is performed. Aluminum alloy layer (L1) and the tread portion 110, the upper and lower protrusions (120, 130) and the side joints (140, 150) in which aluminum alloy powder (Pa) is laminated on the surface (S) by a low temperature spray method. ) After grinding adjacent triangular sections T2, 92.50 to 94.00 weight percent nickel (Ni), 4.50 to 6.00 weight percent silicon (Si), 0.70 to 0.90 weight percent iron (Fe), 0.04 to 0.06 In weight percent manganese (Mn), 0.04 to 0.06 weight percent magnesium (Mg), 0.15 to 0.25 Pyramid-shaped nickel reinforcement in which nickel alloy powder (Pn) composed of percent zinc (Zn), 0.15 to 0.25 weight percent titanium (Ti) and 0.25 to 0.35 weight percent copper (Cu) is laminated by low temperature spray method ( Including the 160, the nickel reinforcement 160 is an isosceles (161a, 161b of 8mm to 10mm length formed on the same plane with the upper and lower protrusions 120, 130 and the side joints 140, 150, respectively) ) And one surface 161 having a bottom side 161c formed on the same plane as the tread part 110, and a vertex 162 spaced apart from the one surface 161 by 2 mm to 3 mm. do. At this time, the aluminum alloy layer (L1) and nickel reinforcement 160, respectively, the aluminum alloy powder (Pa) and nickel alloy powder (Pn) is each of the compressed air (Air) of 5.8kgf / ㎠ to 6.4kgf / ㎠ It may be accelerated to be laminated by a low temperature spray method through the nozzle 240 of the 4mm to 6mm aperture at a distance of 14mm to 16mm apart on the wear surface (S) or the triangular portion (T2), respectively. In addition, the nickel reinforcement 160 may have a Vickers hardness of HV 213 to HV 278.

In addition, the present invention is a tread portion 110 to form a tread of the tire, upper and lower protrusions 120 and 130 protruding from the upper and lower portions of the tread portion 110, the tread portion 110 and the In the repairing method of the tire mold 100 having side joints 140 and 150 orthogonal to both ends of the upper and lower protrusions 120 and 130, the tire mold 110 so that the tread portion 110 forms an inner circumferential surface thereof. ) To the cylindrical measuring jig (J1) to check the wear surface (S) of the tire mold 100 and to measure the worn size (S110), the tread portion 110, the upper and Triangular part grinding step (S120) in which the lower protrusions (120, 130) and the side joints (140, 150) grind adjacent triangular parts (T2), 5.8 aluminum alloy powder (Pa) on the wear surface (S) 5.8 14 mm to 14 on the wear surface S by accelerating with compressed air of kgf / cm 2 to 6.4 kgf / cm 2 Aluminum alloy layer forming step (S130), the triangular portion (T2) to form an aluminum alloy layer (L1) by spraying in a low-temperature spray method through a nozzle 240 of 4mm to 6mm diameter at a distance of 16mm The nickel alloy powder Pn is accelerated with compressed air of 5.8 kgf / cm 2 to 6.4 kgf / cm 2 to have a diameter of 4 mm to 6 mm at a distance of 14 mm to 16 mm from the wear surface S. Nickel reinforcement forming step (S140) and the aluminum alloy layer (L1) and the nickel reinforcement 160 is smoothly finished by spraying the nozzle 240 in a low temperature spray method to form the nickel reinforcement 160. It may be made to include a mapping step (S150). Here, the nickel reinforcement portion 160 is formed in a pyramid shape, and isosceles 161a of 8mm to 10mm length formed on the same plane with the upper and lower protrusions 120 and 130 and the side joints 140 and 150, respectively. And one side 161 having a bottom side 161c formed on the same plane as the tread part 110, and a vertex 162 spaced apart from the one side 161 by 2 mm to 3 mm. It may be characterized by having a Vickers hardness of HV 213 to HV 278.

According to the tire mold having the nickel reinforcement part and the repair method thereof according to the present invention, after the tire mold is repaired by laminating the nickel reinforcement part and the aluminum alloy layer on the worn part of the tire mold, the hardness is improved and the service life is long and the reliability is increased. This has the effect of being improved.

In addition, the nickel reinforcement part and the aluminum alloy layer are sprayed with nickel alloy powder and aluminum alloy powder, respectively, and laminated to the worn parts of the tire mold through work hardening due to supersonic energy, thereby applying extra heat for repairing the tire mold. The operation is omitted, and finer lamination is possible, thereby reducing the working time and finishing time.

In addition, the present invention has a short time for the repair of the tire mold and can be repaired at a relatively low working temperature (25 ℃) has the effect that the deformation of the base material is prevented to improve the reliability.

Hereinafter, a tire mold having a nickel reinforcement part and a repair method thereof will be described in detail with reference to the accompanying drawings and embodiments. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

First, a tire mold having a nickel reinforcement part according to an embodiment of the present invention will be described.

Figure 2a is a perspective view showing a tire mold according to an embodiment of the present invention, Figure 2b is an enlarged perspective view showing part 2b of Figure 2a.

As shown in Figure 2a and 2b, the tire mold 100 according to an embodiment of the present invention is a tread portion 110, upper and lower protrusions 120, 130, side joints 140, 150 and nickel It includes a reinforcement 160.

First, the tread part 110 is to form a tread of a tire and is formed to have various patterns according to the design of a person skilled in the art. The upper and lower protrusions 120 and 130 are formed on the upper and lower portions of the tread portion 110, and the upper and lower side molds (not shown) assembled on the upper and lower portions of the plurality of tire molds 100 assembled in a cylindrical shape. Is made in contact with each other. Next, the side joints 140 and 150 are formed vertically with respect to the tire circumference, and are substantially in contact with adjacent tire molds of the same type.

The nickel reinforcement part 160 is formed in the triangular part T2 adjacent to the tread part 110, the upper and lower protrusion parts 120 and 130, and the side joint parts 140 and 150, and sprays nickel alloy powder at a low temperature. It is made by laminating. Substantially, the triangular portion T2 is a portion in which stress is concentrated while the tire mold 100 is in contact with the upper and lower side molds (not shown) or the same split mold, and tire vulcanization is in progress, and is relatively worn out compared to other portions. Can be easily generated. Therefore, the nickel reinforcement 160 may be reinforced by using a nickel alloy powder having a relatively high hardness as compared to aluminum (Al) or an aluminum alloy material of the tire mold 100.

According to the present invention, the nickel reinforcement 160 may have a pyramid shape. In more detail, the nickel reinforcement 160 is an isosceles including three sides formed on the same plane as the tread portion 110, the upper and lower protrusions 120 and 130, and the side joint portions 140 and 150, respectively. It may be formed by including one surface 161 and the vertex 162 facing the one surface 161 in the form of a triangle. That is, one surface 161 of the nickel reinforcement part 160 is an isosceles 161a and 161b and a tread part 110 formed on the same plane as the upper and lower protrusions 120 and 130 and the side junctions 140 and 150, respectively. ) And the bottom side 161c formed on the same plane. At this time, the isosceles 161a and 161b of the nickel reinforcement part 160 are formed to have a length of 8 mm to 10 mm, and a length h of 2 mm to 3 mm from one surface 161 to the vertex 162 of the nickel reinforcement part 160. Can be selected as. Since the nickel reinforcement 160 has a Vickers hardness of HV 213 to HV 218, the force to withstand stress increases, and the nickel reinforcement 160 is not easily damaged even if the tire mold 100 is placed to face the bottom surface. Specific components of the nickel reinforcement unit 160 and a repair method of the tire mold according to the present invention will be described in more detail with reference to other drawings below.

Meanwhile, according to the present invention, aluminum alloy powder may be laminated on the wear surfaces of the upper and lower protrusions 120 and 130 and the side joints 140 and 150 other than the nickel reinforcement 160 by a low temperature spray method. That is, after the aluminum alloy powder is laminated on the wear surface by a low temperature spray method, the tire mold 100 may be repaired to its original state through a repair step of mapping the laminated aluminum alloy layer L1. Since the aluminum alloy layer L1 has a Vickers hardness of HV75 to HV 83, it is possible to obtain a tire mold 100 having improved reliability and lifespan compared to a conventional TIG welding method. Since the lamination method of the aluminum alloy powder is made in the same manner as the method of forming the nickel reinforcement 160, it will be described in more detail below.

The present invention as described above includes the nickel reinforcement unit 160 to obtain a tire mold 100 having improved life and reliability by improving hardness. That is, the hardness of the tire mold 100 may be strengthened by forming the nickel reinforcement 160 in a low-temperature spray method on a portion where the tire mold 100 is most easily worn and stress is concentrated. In addition, the tire mold 100 includes the aluminum alloy layer L1, thereby improving hardness of the upper and lower protrusions 120 and 130 and the side joints 140 and 150, thereby improving reliability.

Next, a method of repairing a tire mold according to an embodiment of the present invention will be described in detail. Here, the repair method of the tire mold will be described with reference to the tire mold 100 of FIGS. 2A and 2B.

FIG. 3 is a schematic diagram of the spray apparatus used for the tire mold repair method, and FIG. 4 is a flowchart showing the tire mold repair method in order. 5A to 5F show schematic diagrams of respective steps according to the method of repairing the tire mold of FIG. 4.

As shown in Figure 3, the spray device 200 used in one embodiment of the present invention is an air compressor 210 for discharging compressed air (Air), a heater 220 for heating the compressed air, nickel alloy powder (Pn) or the feeder 230 for supplying the aluminum alloy powder (Pa) and the nickel alloy powder (Pn) or aluminum alloy powder (Pa) is sprayed at a supersonic speed to deposit on the base material (or tire mold, not shown) It may be made including a nozzle (240).

First, the air compressor 210 supplies the compressed air Air having a predetermined pressure to the nozzle 240 so that the aluminum alloy powder Pa supplied from the feeder 230 is deposited on the base material in an accelerated state. According to the present invention, the air compressor 210 transmits compressed air (Air) having a pressure of 5.8 kgf / cm 2 to 6.4 kgf / cm 2 to the feeder 230, whereby nickel alloy powder (Pn) or aluminum alloy powder (Pa ) Is accelerated through the nozzle 240 at a speed of 300 m / sec to 1200 m / sec. On the other hand, the compressed air used in the present invention is safe and easy to process because it is relatively low-temperature air without explosive and harmful.

The heater 220 is formed to apply a predetermined heat to the compressed air (Air) supplied through the air compressor 210. The heater 220 serves to heat the compressed air to help the nickel alloy powder Pn or the aluminum alloy powder Pa to be deposited at a faster acceleration rate. However, the spray device 200 used in the present invention may not use the heater 220, but the present invention is not limited thereto.

The feeder 230 is for supplying nickel alloy powder (Pn) or aluminum alloy powder (Pa) to be deposited on the base material to the nozzle 240, the powder (Pn or Pa) stored in the feeder 230 is an air compressor ( It is introduced into the nozzle 240 together with the compressed air supplied through 210. At this time, the powder (Pn or Pa) stored in the feeder 230 is selected to have a particle size of 1㎛ 50㎛, when the particle of the powder (Pn or Pa) is smaller than 1㎛ less impact amount to work hardening Since the adhesion with the base material is not made smoothly, and if the particles of the powder (Pn or Pa) is larger than 50㎛, since the number of impacts per area of the base material is reduced, it should be noted that the work hardening is not performed smoothly.

The nozzle 240 is for injecting nickel alloy powder (Pn) or aluminum alloy powder (Pa) at supersonic speed by compressed air, and a nozzle having a de laval shape may be used. That is, the nozzle 240 has a diameter relatively larger than that of the inlet 241 and the outlet 242 and the inlet 241 and the outlet 242 through which compressed air and powder Pn or Pa are introduced and drawn out. It may comprise a small neck 243. Accordingly, nickel alloy powder (Pn) or aluminum alloy powder (Pa) introduced through the inlet 241 is deposited on the base material with kinetic energy of supersonic speed while passing through the neck 243. According to the present invention, the outlet 242 of the nozzle 240 may be selected to have a diameter D of 4 mm to 6 mm. This means that when the outlet 242 of the nozzle 240 is smaller than 4 mm, the powder Pn or Pa cannot be smoothly sprayed through the outlet 242, and the outlet 242 of the nozzle 240 exceeds 6 mm. In this case, since the lamination area of the base material is wide, it is difficult to precise lamination.

As shown in Figure 4, the repair method of the tire mold according to an embodiment of the present invention is the dimension measurement step (S110), triangular grinding step (S120), aluminum alloy layer forming step (S130), nickel reinforcement forming A step S140, a mapping step S150, and a dimension checking step S160 may be performed. According to the present invention, the nickel reinforcing portion 160 is formed in the triangular portion T2 of the tire mold 100, so that the hardness is improved and the life is long. In addition, on the wear surfaces of the upper and lower protrusions 120 and 130 and the side joints 140 and 150, an aluminum alloy layer L1 in which aluminum alloy powder Pa is laminated by a low temperature spray method is formed, thereby forming a tire mold 100. ) Is not only reused, but the hardness is further improved. The nickel reinforcement part 160 and the aluminum alloy layer L1 of the tire mold 100 may be stacked by a low temperature spray method, and thus work may be performed in a relatively short time. It becomes possible.

First, the dimension measuring step S110 is a step of checking the wear surface S of the tire mold 100 and measuring the worn dimension as shown in FIG. 5A. The tire mold 100 is assembled such that the tread part 110 is formed as an inner circumferential surface of the cylindrical measuring jig J1 in order to check the wear surface S and measure the size thereof. Substantially, when there is no wear part, the tire mold 100 is in contact with the adjacent mold without any gap in the measuring jig J1, and there is no difference in dimensions from the adjacent mold. That is, when the worn tire mold 100 is assembled to the measuring jig J1, the part to be repaired is checked through identification of gaps with adjacent molds and differences in shape and dimensions of the triangular portion T2.

The triangular grinding step (S120) is a step in which the triangular part T2 on which the nickel reinforcement part 160 is to be formed is ground as shown in FIG. 5B. The triangular portion T2 is a portion where the tread portion 110, the upper and lower protrusion portions 120 and 130, and the side joint portions 140 and 150 are adjacent to each other, and the stress is most concentrated and easily damaged in the tire mold 100. Corresponds to Therefore, the worn triangular portion T2 may be roughly ground to form the nickel reinforcement 160. The triangular portion T2 has an isosceles triangular shape in which one side formed on the same plane as the upper and lower protrusions 120 and 130 and one side formed on the same plane as the side joint portions 140 and 150 are approximately equal in length. The grinding of the triangular portion (T2) may use an air grinder (G) or an equivalent device, but is not limited thereto.

In the forming of the aluminum alloy layer (S130), as shown in FIG. 5C, the aluminum alloy layer L1 is formed on the worn tire mold 100 other than the triangular portion T2 by using the spray device 200. It's a step. That is, the aluminum alloy layer L1 may be formed on the wear surfaces S of the upper and lower protrusions 120 and 130 and the side joints 140 and 150 measured in the dimension measuring step S110. First, compressed air of 5.8 kgf / cm 2 to 6.4 kgf / cm 2 and aluminum alloy powder (Pa) are introduced into the nozzle 240. The aluminum alloy powder Pa introduced into the nozzle 240 is taken out in an accelerated state at a supersonic speed of 300 m / sec to 1200 m / sec and laminated to the wear surface S. FIG. At this time, the nozzle 240 and the wear surface (S) may be arranged to be spaced apart at a distance of 14mm to 16mm. At the time of lamination, the working temperature can be made at approximately 25 ° C. and the aluminum alloy powder Pa is laminated to the wear surface S through work hardening by supersonic energy rather than thermal chemical work. Therefore, in the aluminum alloy layer forming step (S130) of the present invention, it is possible to attempt lamination of aluminum alloy powder (Pa) without a separate preheating process.

The nickel reinforcing part forming step (S140) is a step of forming the nickel reinforcing part 160 in the triangular part T2 using the spray device 200, as shown in FIG. 5D. In more detail, compressed air and aluminum alloy powder (Pa) of 5.8kgf / ㎠ to 6.4kgf / ㎠ is introduced into the nozzle 240 and then drawn out in an accelerated state at a supersonic speed of 300m / sec to 1200m / sec It is laminated on the triangular portion T2. In this case, the nozzle 240 and the triangular portion T2 are disposed to be spaced apart at a distance of 14 mm to 16 mm. In the stacking of the nickel reinforcement 160, the working temperature and the formation principle are the same as those of forming the aluminum alloy layer (S130). That is, nickel alloy powder Pn is work hardened by supersonic energy, and is laminated | stacked on the triangular part T2. Therefore, in the nickel reinforcing part forming step (S140) of the present invention, nickel alloy powder (Pn) may be laminated without a separate preheating process. The nickel reinforcement part 160 is stacked in a pyramid shape on the triangular part T2, and includes an isosceles formed on the same plane as the upper and lower protrusion parts 120 and 130 and the side joint parts 140 and 150, respectively. 161 and one side 161 includes vertices 162 spaced 2 mm to 3 mm apart.

Referring to Table 1, Vickers hardness of the aluminum alloy layer (L1) and nickel reinforcing portion 160 according to the pressure of the compressed air supplied from the air compressor 210 is described. In Table 1, the diameter of the outlet 242 of the nozzle 240 is based on 5 mm, and the average thickness of the aluminum alloy layer L1 and the nickel reinforcement 160 to be laminated is 1.0 mm. Here, the separation distance l is a distance between the nozzle 240 and the base material (wear surface or triangular portion).

Pressure (kgf /) Separation distance (mm) Aluminum alloy layer Nickel reinforcement Hardness (HV) Average (HV) Surface uniformity Hardness (HV) Average (HV) Surface uniformity 5.3 13 64.40 63.98 Heterogeneity 161.23 161.62 Heterogeneity 14 63.96 162.25 15 63.53 161.14 16 63.22 163.36 17 64.78 160.10 5.5 13 70.42 70.53 Heterogeneity 168.56 169.70 Heterogeneity 14 72.05 169.88 15 70.91 167.24 16 69.84 170.69 17 69.45 172.11 5.8 13 76.78 76.98 Good 213.22 213.83 Good 14 77.42 214.50 15 76.91 213.79 16 75.94 213.54 17 77.87 214.11 6.1 13 79.71 79.21 Good 245.90 244.66 Good 14 78.24 244.80 15 79.68 243.14 16 80.40 245.54 17 78.03 243.91 6.4 13 83.52 82.48 Good 278.44 277.93 Good 14 82.24 278.42 15 83.04 278.68 16 80.05 277.31 17 83.53 276.78 6.7 13 89.11 88.84 Heterogeneity 280.75 279.56 Heterogeneity 14 88.61 279.88 15 87.46 280.30 16 89.05 276.13 17 89.99 280.76 7.0 13 92.14 92.09 Heterogeneity 285.90 284.57 Heterogeneity 14 90.78 284.37 15 94.42 284.51 16 92.11 281.96 17 90.99 286.12

As shown in Table 1, it can be seen that the aluminum alloy layer (L1) and nickel reinforcement portion 160 is increased in proportion to the pressure of the compressed air (Air). In addition, it can be seen that both the aluminum alloy layer L1 and the nickel reinforcement part 160 have good surface uniformity in a region in which the compressed air pressure is 5.8 kgf / cm 2 to 6.4 kgf / cm 2. In the above pressure region, the aluminum alloy layer L1 has a hardness of about HV 75 to HV 83, and the nickel reinforcement 160 has a hardness of about HV 213 to HV 278. On the other hand, it can be seen that the hardness difference according to the separation distance (L) between the nozzle 240 and the base material is generally insignificant. According to the present invention, the average Vickers hardness of the aluminum alloy layer (L1) is improved as the pressure of the compressed air (Air) increases, it can be seen that the surface uniformity worsens when the pressure of the compressed air exceeds 6.4kgf / ㎠ . That is, as the pressure of the compressed air increases, the amount of aluminum alloy powder Pa sprayed through the nozzle 240 increases, so that not only the deposition surface is uneven but also the material is wasted. In addition, when the hardness of the aluminum alloy layer (L1) is too large, it should be noted that the delicate finishing work connected with the tread portion 110 may be difficult. Like the aluminum alloy layer L1, the nickel reinforcement 160 may have a worse surface uniformity when the pressure of the compressed air exceeds 6.4 kgf / cm 2. In addition, if the hardness of the nickel reinforcing portion 160 exceeds HV 280, it may be easily broken, so care should be taken.

On the other hand, according to the present invention, when the separation distance (ℓ) between the nozzle 240 and the base material (wear surface (S) or triangular portion (T1)) is selected to 14mm to 16mm, it can be seen that the pinholes are generated the least. have. Referring to Table 2, the number of pinholes according to the separation distance l between the nozzle 240 and the base material is described.

 Separation distance (mm)  Pressure (kgf /) Number of pinholes (dog / cm ³⁾ Aluminum alloy layer Nickel reinforcement 13   5.8 0.33 0.58 14 0.01 0.06 15 0.01 0.04 16 0.02 0.03 17 0.09 0.45 13   6.0 0.18 0.23 14 0.05 0.06 15 0.02 0.04 16 0.01 0.12 17 0.15 0.45 13   6.2 0.25 0.63 14 0.03 0.01 15 0.04 0.02 16 0.07 0.02 17 0.14 0.78

As shown in Table 2, when the separation distance (L) between the nozzle 240 and the base metal having a 5 mm diameter is selected in the range of 14 mm to 16 mm, it can be confirmed that the number of pinholes is generated on average. If the separation distance (ℓ) is shorter than 14 mm, there is a possibility of pinholes due to the contact between the laminated surface and the air, and conversely, if the separation distance (ℓ) is longer than 16 mm, nickel alloy powder (Pn) or aluminum alloy powder (Pa) is not evenly sprayed. Therefore, when the separation distance l is selected to be 14 mm to 16 mm, it can be seen that the number of pinholes generated is the smallest and the adhesion state is good.

Referring to Table 3, the alloy powder component content of the aluminum alloy powder (Pa) or nickel alloy powder (Pn) used in the present invention is described. At this time, the component content of aluminum (Al) or nickel (Ni) corresponds to the remaining value minus the alloy powder component content of [Table 3] from 100% by weight.

 ingredient  Si  Fe  Mn  Mg  Zn  Ti  Cu   Content (weight percent)  4.50-6.00  0.70 to 0.90  0.04 to 0.06  0.04 to 0.06  0.15 to 0.25  0.15 to 0.25  0.25 to 0.35

As described in Table 3, the powder (Pn or Pa) used in the present invention may comprise 6.00 wt% to 7.50 wt% of alloy powder. The alloy powder is nickel alloy powder (Pn) or aluminum alloy powder (Pa) is flexibly laminated on the base material according to the low-temperature spray method, and helps to form a good state of lamination of the surface. According to the present invention, the alloy powder is selected from silicon (Si), iron (Fe), manganese (Mn), magnesium (Mg), zinc (Zn), titanium (Ti) and copper (Cu) or an equivalent metal thereof. It includes one or more.

For example, nickel alloy powder (Pn) is 92.50 to 94.00 weight percent nickel (Ni), 4.50 to 6.00 weight percent silicon (Si), 0.70 to 0.90 weight percent iron (Fe), 0.04 to 0.06 weight percent Manganese (Mn), 0.04 to 0.06 weight percent magnesium (Mg) comprises 0.15 to 0.25 weight percent zinc (Zn), 0.15 to 0.25 weight percent titanium (Ti) and 0.25 to 0.35 weight percent copper (Cu) Can be done.

In the finishing step S150, as illustrated in FIG. 5E, the finishing process of the surface of the tire mold 100 on which the aluminum alloy layer L1 and the nickel reinforcement part 160 are formed is smoothly processed. The finishing step S150 is a step of processing the tire mold 100 in which the aluminum alloy layer L1 and the nickel reinforcement part 160 are formed before wear, and at least two tire molds 100 in the split jig J2. ) May be configured to map the nickel reinforcement unit 160 or the aluminum alloy layer L1. The finishing step S150 may be performed using a drill, grinder and air mill or equivalent equipment, but the present invention is not limited thereto. The split jig J2 is configured to precisely map two adjacent tire molds 100 and may have a shape in which a cylindrical measuring jig J1 is vertically cut in a circumferential direction. Therefore, the tire mold 100 may be more precisely finished by comparing the dimensions with the adjacent mold. In the finishing step S150, the finishing time is determined according to the thickness and state of the nickel reinforcement 160 and the aluminum alloy layer L1, and the finishing time is 1.5 days to 2 days on average. This is because the aluminum alloy layer L1 and the nickel reinforcement 160 which are laminated by the low temperature spray method have a relatively fine thickness, and the surface state is better than that of the TIG welding method.

In the dimension checking step S160, as shown in FIG. 5F, the mapped tire mold 100 is assembled to the cylindrical jig J1 to check the dimensions. Accordingly, it is confirmed that the repair of the tire mold 100 is completed, and the repaired tire mold 100 can be used again for the vulcanization operation of the tire.

6 is a photograph comparing the surface state of the tire mold according to the conventional method and the surface state of the tire mold on which the nickel reinforcement part 160 according to the present invention is laminated, and FIG. It is a photograph comparing the surface state of the tire metal mold | die in which the aluminum alloy layer L1 which concerns on this invention was laminated | stacked.

As shown in Fig. 6 and 7, the surface state A1 of the tire mold according to the conventional method is a black deformation of the boundary between the base material (lower part) and the welding layer (upper part) by a temperature of several hundred degrees (° C.). You can check. On the other hand, according to the present invention, the surface state B1 of the tire mold 100 in which the nickel reinforcement part 160 (the upper part) is stacked and the surface state C1 of the tire mold 100 in which the aluminum alloy layer L1 is laminated. Since no separate heat is transmitted during the lamination by the low temperature spray method, it can be confirmed that there is little damage at the boundary between the base material (lower part) and the laminated material (upper part). In addition, the conventional surface state A1 has a relatively thick and irregular weld layer (upper part) compared to the present invention, but the surface state B1 of the nickel reinforcement part 160 and the aluminum alloy layer (upper part) according to the present invention. , C1) can be confirmed to be relatively uniform.

According to the repairing method of the tire mold according to the present invention described above, since the nickel reinforcement part 160 and the aluminum alloy layer L1 are formed in a low temperature spray method, a working time and a finishing time for repairing the tire mold 100 are short. Lose. The nickel reinforcement part 160 and the aluminum alloy layer L1 spray the nickel alloy powder Pn and the aluminum alloy powder Pa, respectively, and the triangular portion T2 and the wear surface S through work hardening due to supersonic energy. It is formed through the method of laminating to, thereby eliminating the task of applying a separate heat, finer lamination is possible. As a result, the time for mapping the nickel reinforcement part 160 and the aluminum alloy layer L1 becomes shorter. In addition, the present invention provides a repair method having improved reliability of the tire mold 100 by preventing deformation of the base material because the working temperature (25 ° C) is relatively low and the repair time is short.

The present invention is not limited to the above specific preferred embodiments, and any person skilled in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention as claimed in the claims. Of course, such changes are within the scope of the claims.

1 is a perspective view of a split mold of a conventional tire mold.

Figure 2a is a perspective view of a tire mold having a nickel reinforcement portion according to an embodiment of the present invention.

Figure 2b is an enlarged perspective view of a nickel reinforcement portion according to an embodiment of the present invention.

3 is a schematic diagram of a spray apparatus used in a method of repairing a tire mold according to an embodiment of the present invention.

4 is a flowchart illustrating a method of repairing a tire mold in accordance with an embodiment of the present invention in order.

5A to 5F are schematic diagrams for each step according to the repairing method of the tire mold of FIG. 4.

Figure 6 is a photograph comparing the surface state of the tire mold according to the conventional method and the surface state of the tire mold laminated nickel reinforcement according to the present invention.

7 is a photograph comparing the surface state of the tire mold according to the conventional method and the surface state of the tire mold in which the aluminum alloy layer according to the present invention is laminated.

<Description of Symbols for Main Parts of Drawings>

10, 100: tire mold 110: tread portion

120: upper protrusion 130: lower protrusion

140, 150: side joint T1, T2: triangular

160: nickel reinforcement 200: spray device

210: air compressor 220: heater

230: feeder 240: nozzle

J1: Cylindrical Jig J2: Split Jig

Claims (5)

A tread part 110 forming a tread of a tire, upper and lower protrusions 120 and 130 protruding from the upper and lower portions of the tread part 110, the tread part 110 and the upper and lower protrusions ( In the tire mold 100 having the side joint portions 140 and 150 orthogonal to both ends of the 120 and 130, Aluminum alloy layer (L1) in which the aluminum alloy powder (Pa) is laminated on the wear surface of the upper and lower protrusions (120, 130) and the side joints (140, 150) by a low temperature spray method, and 92.50 to 94.00% by weight of nickel (Ni) after grinding the triangular portion T2 adjacent to the tread portion 110, the upper and lower protrusion portions 120 and 130, and the side junction portions 140 and 150, 4.50 to 6.00 weight percent silicon (Si), 0.70 to 0.90 weight percent iron (Fe), 0.04 to 0.06 weight percent manganese (Mn), 0.04 to 0.06 weight percent magnesium (Mg), 0.15 to 0.25 weight percent Nickel alloy powder (Pn) made of zinc (Zn), 0.15 to 0.25 weight percent titanium (Ti) and 0.25 to 0.35 weight percent copper (Cu) is pyramidal shape nickel reinforcement 160 laminated by a low temperature spray method Including, The nickel reinforcement 160, 8 mm to 10 mm isosceles 161a and 161b lengths formed on the same plane as the upper and lower protrusions 120 and 130 and the side junctions 140 and 150, respectively, and formed on the same plane as the tread part 110. A tire mold having a nickel reinforcement part including one surface 161 having a bottom side 161c and a vertex 162 facing away from the one surface 161 by 2 mm to 3 mm. The method of claim 1, The aluminum alloy layer (L1) and nickel reinforcement 160, respectively, Each of the aluminum alloy powder (Pa) and the nickel alloy powder (Pn) is accelerated with compressed air (Air) of 5.8 kgf / cm 2 to 6.4 kgf / cm 2, and each 14 mm on the wear surface S or the triangular portion T2. Tire mold, characterized in that laminated by low-temperature spraying through the nozzle 240 of the 4mm to 6mm aperture at a distance from 16mm to 16mm. The method of claim 1, The nickel reinforcement 160 is a tire mold, characterized in that having a Vickers hardness of HV 213 to HV 278. A tread part 110 forming a tread of a tire, upper and lower protrusions 120 and 130 protruding from the upper and lower portions of the tread part 110, the tread part 110 and the upper and lower protrusions ( In the repairing method of the tire mold 100 having the side joint portions 140 and 150 orthogonal to both ends of the 120 and 130, The tire mold 110 is assembled to the cylindrical measuring jig J1 to form the inner circumferential surface of the tread part 110 to check the wear surface S of the tire mold 100 and to measure the worn size. Measuring step S110; Triangular grinding step (S120) for grinding the triangular portion (T2) adjacent the tread portion (110), the upper and lower protrusions (120, 130) and the side junctions (140, 150); Accelerating the aluminum alloy powder (Pa) on the wear surface (S) with compressed air (Air) of 5.8kgf / ㎠ to 6.4kgf / ㎠ 4 at a distance of 14mm to 16mm away from the wear surface (S) An aluminum alloy layer forming step (S130) of forming an aluminum alloy layer (L1) by spraying through a low temperature spray method through a nozzle 240 having a diameter of 6 mm to 6 mm; The nickel alloy powder (Pn) in the triangular portion (T2) is accelerated by compressed air (Air) of 5.8kgf / ㎠ to 6.4kgf / ㎠ 4 at a distance 14mm to 16mm away from the wear surface (S) Nickel reinforcing part forming step (S140) of forming a nickel reinforcing part 160 by spraying through a low temperature spray method through the nozzle 240 of the mm to 6mm diameter; And The finishing step (S150) for smoothly finishing the aluminum alloy layer (L1) and the nickel reinforcement portion (160); repair method of a tire mold comprising a. The method of claim 4, wherein The nickel reinforcing portion 160 is formed in a pyramid shape, and isosceles 161a and 161b having a length of 8 mm to 10 mm formed on the same plane as the upper and lower protrusions 120 and 130 and the side junctions 140 and 150, respectively. ) And one surface 161 having a bottom side 161c formed on the same plane as the tread part 110, and a vertex 162 spaced apart from the one surface 161 by 2 mm to 3 mm, and HV 213. To a Vickers hardness of HV 278.

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