KR100867277B1 - Method for repairing tire mold using cold spray technology - Google Patents

Abstract

A method for repairing tire mold using cold spray technology is provided to reduce work time required to welding and then reduce costs by forming aluminum alloy layer having relatively thin and improved hardness using cold spray technology. A method for repairing tire mold using cold spray technology comprises a dimension measuring step for measuring worn surface of the top and bottom protrusion and the side boding surface; an aluminum alloy layer formation step for forming an aluminum alloy layer(L1) by spraying with a low temperature spray way through the nozzle(240) of 4mm which is away 14mm or 16mm or 6mm from the worn surface by accelerating aluminum alloy powder(Pa) on the polished surface to the compressed air of 5.8kgf/cm^2 or 6.4kgf/cm^2; and a polishing step for polishing the aluminum alloy layer smoothly.

Description

Repair method of tire mold using low temperature spray method {METHOD FOR REPAIRING TIRE MOLD USING COLD SPRAY TECHNOLOGY}

The present invention relates to a method of repairing a tire mold using a low temperature spray method, and more particularly, to aluminum alloy powder laminated on a worn tire mold by a low temperature spray method, so that the deformation of the base material is less, and the aluminum alloy has a relatively thin and improved hardness. The present invention relates to a method for repairing a tire mold by using a low temperature spray method, in which a layer is formed to reduce a repair cost due to shortening of working time and finishing time.

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.

1, there is shown a perspective view showing a split mold of a conventional tire mold.

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 may wear out 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, and the mold and the mold may be worn by the worn surfaces. There is a possibility that a gap is formed between the raw materials of the tires. Therefore, the tire mold 10 prevents defects caused by raw material precipitation through regular repair work.

In the conventional tire mold 10, a Tungsen Insert Gas Welding (TIG) method, in which a predetermined thickness of aluminum is deposited on a worn surface and then mapped, is mainly used, but the TIG welding has a working temperature close to 700 ° C. Since the mold is likely to be deformed, such as the mold is expanded or distorted by heat, there is a problem that the operating conditions are difficult because there is a risk factor such as high temperature and explosion because gas such as argon must be used.

In addition, the welding of aluminum using TIG welding takes about one day or more for the repair of a mold requiring a precise dimension of 1 mm or less because the thickness thereof is approximately 5 mm to 8 mm, and the time required for finishing is three days or more. There is a problem that the work time and finishing time are relatively long.

The present invention is to solve the above-mentioned conventional problems, in particular to provide a repair method of a tire mold using a low-temperature spray method to prevent deformation of the mold by laminating aluminum alloy powder on the surface of the worn tire mold by a low-temperature spray method. Its purpose is to.

In addition, the present invention provides a method for repairing a tire mold using a low-temperature spray method to form a relatively thin, hardened aluminum alloy layer by the low-temperature spray method to shorten the working time and finishing time required for welding, thereby reducing the repair cost. There is another purpose.

Tire repair method using a low temperature spray method according to the present invention is a tread portion 110 to form a tread of the tire, and the upper and lower protrusions 120, 130 protruding on the upper and lower portions of the tread portion 110 And a tread portion 110 having a tread portion 110 and side joint portions 140 and 150 orthogonal to both ends of the upper and lower protrusion portions 120 and 130. ), The tire mold 110 is assembled to a cylindrical measuring jig J1 to form an inner circumferential surface, and the wear surfaces S of the upper and lower protrusions 120 and 130 and the side joints 140 and 150 are measured. Dimension measuring step (S110), the wear surface (S) to accelerate the aluminum alloy powder (Pa) with compressed air (Air) of 5.8kgf / ㎠ to 6.4kgf / ㎠ to the wear surface (S) and 14mm to Cold soup through nozzles 240 of 4 mm to 6 mm aperture at a distance of 16 mm It may include the aluminum alloy layer forming step (S120) for spraying in a ray method to form the aluminum alloy layer (L1) and the finishing step (S130) for smoothly finishing the aluminum alloy layer (L1).

In addition, in the aluminum alloy layer forming step (S120), the aluminum alloy layer (L1) may be formed to a thickness of 0.1mm to 1mm.

In this case, the aluminum alloy powder (Pa) is 92.50 to 94.00 weight percent aluminum (Al), 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 zinc (Zn), 0.15 to 0.25 weight percent titanium (Ti) and 0.25 to 0.35 weight percent copper (Cu). have.

The repairing method of a tire mold using the low temperature spray method according to the present invention is suitable for repairing a tire mold requiring fine dimensions because it is possible to laminate a relatively fine aluminum alloy layer having a thickness of 0.1 mm to 1.0 mm, and has excellent surface condition. Since there is no separate heating and cooling process, the lamination time and the finishing time of the aluminum alloy layer are shortened, thereby improving the cost and efficiency for repairing the tire mold.

In addition, since the present invention can work at room temperature (25 ℃) there is an effect of preventing the tire mold from being damaged due to expansion or distortion due to the high temperature.

In addition, by supplying the compressed air to accelerate the aluminum alloy powder at a pressure of 5.8kgf / ㎠ to 6.4kgf / ㎠ the aluminum alloy layer with improved hardness relative to the welding layer (HV 63 to HV 67) according to the TIG welding method ( HV 75 to HV 83) can be laminated.

In addition, since the compressed air used in the present invention is relatively low temperature air without explosiveness and harmfulness, it is safe and has an effect of easy process management.

 In addition, according to the present invention, when spraying the aluminum alloy powder with a low-temperature spray method in a state where the wear surface and the nozzle are separated from 14mm to 16mm, there is no pore generation, so the effect of forming an aluminum alloy layer having excellent adhesion and surface state is formed. have.

Hereinafter, a method of repairing a tire mold using a low temperature spray method according to the present invention 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 spray apparatus used in a repair method of a tire mold using a low temperature spray method according to an embodiment of the present invention will be described.

2, there is shown a schematic diagram showing a spray device used in the repair method of a tire mold using a low temperature spray method according to an embodiment of the present invention.

As shown in Figure 2, 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, aluminum alloy powder It may include a feeder 230 for supplying (Pa) and a nozzle 240 for spraying the aluminum alloy powder (Pa) to deposit on the base material (or tire mold, not shown).

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 the compressed air (Air) having a pressure of 5.8kgf / ㎠ to 6.4kgf / ㎠ to the feeder 230, so that the aluminum alloy powder (Pa) to the nozzle 240 It is supplied to accelerate 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 help the aluminum alloy powder Pa to be deposited at a faster acceleration rate by heating the compressed air. 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 the aluminum alloy powder (Pa) to be deposited on the base material to the nozzle 240, the aluminum alloy powder (Pa) stored in the feeder 230 is compressed through the air compressor 210 It is introduced into the nozzle 240 together with the air (Air). At this time, the aluminum alloy powder (Pa) stored in the feeder 230 is selected to have a particle size of 1㎛ 50㎛, when the particle of the aluminum alloy powder (Pa) is smaller than 1㎛, the impact amount is small to work hardening Adhesion with the base material is not made smoothly, and when the particles of the aluminum alloy powder (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 made smoothly as well.

The nozzle 240 is for injecting 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 the inlet 241 and the outlet 242 and the inlet 241 and the outlet 242 through which compressed air and aluminum alloy powder Pa are introduced and drawn out. It may comprise a small neck 243. Accordingly, the aluminum alloy powder Pa introduced through the inlet 241 passes through the neck 243 and is deposited on the base material with kinetic energy of supersonic speed. 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 aluminum alloy powder Pa may not 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.

Next, a repair method of a tire mold using a low temperature spray method according to an embodiment of the present invention will be described in detail.

3 is a flowchart illustrating a method for repairing a tire mold using a low temperature spray method according to an embodiment of the present invention, and FIGS. 4A to 4D show a method of repairing a tire mold using the low temperature spray method of FIG. 3. A diagram showing the state of each step is shown.

As shown in Figure 3, the repair method of the tire mold using a low temperature spray method according to an embodiment of the present invention is the dimension measurement step (S110), aluminum alloy layer forming step (S120), finishing step (S130) and dimensions It may be made, including the step (S140). According to the present invention, by laminating aluminum alloy powder (Pa) on the wear surface of the tire mold 100 by a low temperature spray method, the tire mold 100 having improved hardness after repair is provided. Since the lamination of the aluminum alloy powder (Pa) is unnecessary to heat the base material, the working time is shorter than that of the TIG welding method, and the base material is prevented from being twisted or deformed by shrinkage expansion due to heat.

First, the dimension measuring step S110 is a step of measuring the degree of wear of the tire mold 100, as shown in Figure 4a. At this time, the tire mold 100 is a tread portion 110 for forming a tread of the tire, the upper and lower protrusions 120 and 130 and the tread portion 110 and the upper and lower protrusions formed on the upper and lower portions of the tread portion 110 And side junctions 140 and 150 orthogonal to both ends of the lower protrusions 120 and 130. Such a tire mold 100 is assembled to a cylindrical measuring jig J1 in order to check the wear site and measure the dimensions accordingly. That is, the tire mold 100 is assembled such that the tread part 110 is formed as an inner circumferential surface on the cylindrical jig J1. Substantially, the tire mold 100 is in contact with the adjacent mold in the measuring jig J1 without a gap when there is no wear part, and there is no difference in dimensions in the upper and lower protrusions 120 and 130 or the side joints 140 and 150. do. That is, when the worn tire mold 100 is assembled to the measuring jig J1, the gap between the adjacent mold and the dimension difference between the upper and lower protrusions 120 and 130 or the side joints 140 and 150 can be identified. .

The aluminum alloy layer forming step (S120) is a step of forming an aluminum alloy layer L1 on the wear surface S, as shown in FIG. 4B. In the aluminum alloy layer forming step S120, the aluminum alloy powder Pa may be laminated on the wear surface S by using the spray device 200 of FIG. 2. According to the present invention, the compressed air and aluminum alloy powder (Pa) of 5.8kgf / ㎠ to 6.4kgf / ㎠ in a state in which the separation distance (ℓ) of the nozzle 240 and the wear surface (S) is selected from 14mm to 16mm It enters through 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 working temperature may be made at about 25 ℃, aluminum alloy powder (Pa) is laminated on the wear surface (S) through the work hardening by supersonic energy, not chemical processing by heat. Therefore, in the aluminum alloy layer forming step (S120) of the present invention, aluminum alloy powder (Pa) may be laminated without a separate preheating process.

Referring to [Table 1], the Vickers hardness of the aluminum alloy layer (L1) according to the pressure of the compressed air is shown. At this time, the diameter of the outlet 242 of the nozzle 240 is based on 5mm, the average thickness of the aluminum alloy layer (L1) to be laminated is based on 1.0mm.

Pressure (kgf /) Separation distance (mm) Hardness (HV) Average hardness (HV) Surface uniformity (%) 5.3 13 64.40 63.98 Heterogeneity 14 63.96 15 63.53 16 63.22 17 64.78 5.5 13 70.42 70.53 Heterogeneity 14 72.05 15 70.91 16 69.84 17 69.45 5.8 13 76.78 76.98 Good 14 77.42 15 76.91 16 75.94 17 77.87 6.1 13 79.71 79.21 Good 14 78.24 15 79.68 16 80.40 17 78.03 6.4 13 83.52 82.48 Good 14 82.24 15 83.04 16 80.05 17 83.53 6.7 13 89.11 88.84 Heterogeneity 14 88.61 15 87.46 16 89.05 17 89.99 7.0 13 92.14 92.09 Heterogeneity 14 90.78 15 94.42 16 92.11 17 90.99

As shown in Table 1, it can be confirmed that the aluminum alloy layer L1 has a hardness of Vickers hardness HV 75 or higher at a pressure of compressed air of 5.8 kgf / cm 2 or more. In addition, it can be seen that the hardness difference according to the separation distance l between the nozzle 240 and the wear surface S is generally insignificant. 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, since the amount of the aluminum alloy powder Pa sprayed through the nozzle 240 increases as the pressure of the compressed air increases, not only the deposition surface may be uneven but also a waste of material. 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.

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

Separation distance (mm) Pressure (kgf /) Number of pinholes (dog / cm ³⁾ 13 5.8 0.33 14 0.01 15 0.01 16 0.02 17 0.09 13 6.0 0.18 14 0.05 15 0.02 16 0.01 17 0.15 13 6.2 0.25 14 0.03 15 0.04 16 0.07 17 0.14

As shown in Table 2, when the separation distance ℓ between the nozzle 240 and the wear surface S 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 14mm, there is a possibility that pinholes are generated due to the contact between the laminated surface and air, and conversely, if the separation distance (ℓ) is longer than 16mm, the aluminum alloy powder (Pa) is uniformly sprayed. It is not possible. 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, so that the adhesion state of the aluminum alloy powder Pa is good. According to the present invention, it takes 5 to 6 hours to form the aluminum alloy layer L1 having a thickness of 0.1 mm to 1.0 mm on average.

Aluminum alloy powder (Pa) used in the present invention may be made of a component content as shown in Table 3.

 ingredient  Al  Si  Fe  Mn  Mg  Zn  Ti  Cu  Content (weight percent)  92.50-94.00  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 shown in Table 3, the aluminum alloy powder (Pa) may be made of 92.50 to 94.00 weight percent aluminum (Al) and 6.00 to 7.50 weight percent alloy powder. The alloy powder included in the pure aluminum powder is laminated with aluminum alloy powder (Pa) relatively flexibly on the wear surface (S) according to the low temperature spraying method, and helps to form a good lamination state 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, the aluminum alloy powder (Pa) is 92.50 to 94.00 weight percent aluminum (Al), 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 zinc (Zn), 0.15 to 0.25 weight percent titanium (Ti) and 0.25 to 0.35 weight percent copper (Cu) It can be done by.

 The finishing step S130 is a step of smoothly finishing the aluminum alloy layer L1 as illustrated in FIG. 4C. The finishing step S130 is a step of processing the tire mold 100 on which the aluminum alloy layer L1 is formed before wear, and in the state in which at least two tire molds 100 are assembled to the split jig J2, aluminum is formed. It may be made to map the alloy layer (L1). The finishing step may be performed using a drill, grinder and air mill or equivalent equipment, but is not limited thereto. In this case, the split jig J2 is configured to accurately 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. Accordingly, the tire mold 100 in which the aluminum alloy layer L1 is formed may be accurately processed. In the finishing step S130, the finishing time is determined according to the lamination thickness and the state of the aluminum alloy layer L1, and it takes 1.5 days to 2 days on average. This is because the aluminum alloy layer L1 laminated by the low temperature spray method has a fine thickness of 0.1 mm to 1.0 mm.

The dimension checking step (S140), as shown in Figure 4d, is a step of assembling the mapped tire mold 100 to the cylindrical jig (J1) again 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.

5 is a photograph comparing the surface state of the tire mold according to the conventional method and the surface state of the tire mold according to the present invention, and FIG. 6 is a welding layer forming state according to the conventional method and an aluminum alloy layer forming state according to the present invention. It is a photograph compared.

As shown in Figure 5, the surface state (A1) of the tire mold according to the conventional method can be confirmed that the boundary between the base material (lower) and the welding layer (upper) by the temperature of several hundred degrees (℃) black. Can be. On the other hand, the surface state B1 of the tire mold according to the present invention has almost no damage at the boundary between the base material (lower part) and the aluminum alloy layer (upper part) because no separate heat is transmitted during lamination of the aluminum alloy powder. You can see that. In addition, although the conventional surface state A1 is made of a relatively thick and irregular weld layer (upper part) compared with the present invention, it is confirmed that the surface state B1 of the aluminum alloy layer (upper part) according to the present invention is relatively uniform. Can be.

 As shown in FIG. 6, the welding layer forming state A2 according to the conventional method is rougher and uneven surface than the aluminum alloy layer forming state B2 according to the present invention, and pinholes may be generated after the work. In contrast, the aluminum alloy layer forming state B2 according to the present invention has a relatively smooth surface. Therefore, in the aluminum alloy layer forming state B2 according to the present invention, the finishing operation is performed faster than the welding layer forming state A2 according to the conventional method. Substantially the finishing operation in the weld layer forming state A2 according to the conventional method takes at least 3 days to 4 days, while the finishing operation in the aluminum alloy layer forming state B2 according to the present invention is 1.5 under the same conditions. One to two days to complete. However, since there may be other variables in addition to the above-described state in the present invention, the mapping time is not limited thereto.

According to the embodiment of the present invention described above, by laminating the aluminum alloy powder on the wear surface of the tire mold by a low temperature spray method, deformation of the mold may be prevented and the hardness of the tire mold may be improved. In more detail, since the low temperature spray method can work at room temperature (25 ° C.), it is possible to prevent the tire mold from being damaged due to expansion or distortion due to the high temperature. In addition, by supplying compressed air (Air) to accelerate the aluminum alloy powder (Pa) at a pressure of 5.8kgf / ㎠ to 6.4kgf / ㎠ it is relatively hardness compared to the welding layer (HV 63 to HV 67) according to the TIG welding method The improved aluminum alloy layer (L1, HV 75 to HV 83) can be laminated. At this time, the compressed air (Air) is relatively low-temperature air without explosive and harmful, safe and easy to process management.

In addition, according to the present invention, when spraying the aluminum alloy powder (Pa) by the low-temperature spray method in a state in which the wear surface (S) and the nozzle 240 are spaced apart from 14mm to 16mm, there are almost no pores, the adhesion state and the surface state An excellent aluminum alloy layer L1 can be obtained.

In addition, the repair of the tire mold 100 by the low temperature spray method can be laminated to a relatively fine aluminum alloy layer (L1) of 0.1mm to 1.0mm thickness is suitable for the repair of the tire mold 100 requiring a fine dimension. Since the surface condition is excellent and there is no need for a separate heating and cooling process, the lamination time and the finishing time of the aluminum alloy layer L1 are shortened, thereby improving the cost and efficiency for repairing the tire mold 100.

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 conventional tire mold.

Figure 2 is a schematic diagram showing a spray device used in the repair method of the tire mold using a low temperature spray method according to an embodiment of the present invention.

3 is a flowchart illustrating a method of repairing a tire mold using a low temperature spray method according to an embodiment of the present invention.

Figures 4a to 4d is a view showing each step according to the repair method of the tire mold using the low temperature spray method of FIG.

5 is a photograph comparing the surface state of the tire mold according to the present invention with the surface state of the tire mold according to the conventional method.

6 is a photograph comparing the welding layer formation state according to the conventional method and the aluminum alloy layer formation state according to the present invention.

<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 200: spray device

210: air compressor 220: heater

230: feeder 240: nozzle

J1: Cylindrical Jig J2: Split Jig

Claims (3)

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 method for repairing the tire mold 100 having the side joint portions 140, 150 orthogonal to both ends of the 120, 130, The tire mold 110 is assembled to the cylindrical measuring jig J1 so that the tread part 110 forms an inner circumferential surface, and wear surfaces of the upper and lower protrusions 120 and 130 and the side joints 140 and 150 are formed. Dimension measuring step (S110) of measuring (S); 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 14mm to 16mm away from the wear surface (S) An aluminum alloy layer forming step (S120) 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; And The finishing step (S130) of smoothly finishing the aluminum alloy layer (L1); repair method of a tire mold using a low-temperature spray method comprising a. The method of claim 1, In the aluminum alloy layer forming step (S120), The aluminum alloy layer (L1) is a tire mold repair method using a low-temperature spray method, characterized in that formed in a thickness of 0.1mm to 1mm. The method of claim 1, The aluminum alloy powder (Pa) is 92.50 to 94.00 weight percent aluminum (Al), 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 zinc (Zn), 0.15 to 0.25 weight percent titanium (Ti) and 0.25 to 0.35 weight percent copper (Cu) Tire mold repair method using a low temperature spray method.

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