Die bridge crack repairing method for aluminum extrusion die

Abstract

The invention discloses a mold bridge crack repairing method for an aluminum extrusion mold, which comprises the following steps of: a, grinding cracks, namely grinding the positions, where the cracks are generated, of a mold bridge of the mold and forming welding grooves; b, tenon-and-mortise blocks and tenon-and-mortise grooves are machined, the tenon-and-mortise blocks are produced and machined, and the tenon-and-mortise grooves are machined below the positions, where cracks are generated, of the mold bridge; c, mortise and tenon blocks are embedded, and the mortise and tenon blocks are correspondingly embedded in the mortise and tenon grooves; and d, welding and filling are conducted, specifically, welding and filling are conducted on the welding groove of the mold bridge, and the surface of the mold bridge is recovered to be flat. By adopting the mold bridge crack repairing method, the supporting force of the repaired mold bridge can be enhanced, the mold core offset is reduced, and meanwhile, the service life of the mold is prolonged.

Description

Technical Field

[0001] The invention relates to the field of aluminum extrusion dies, in particular to a method for repairing a mold bridge crack of an aluminum extrusion die. Background Art

[0002] As we all know, with the rapid development of new energy vehicles in China, aluminum alloy materials are also widely used in the automotive industry. Aluminum alloy materials are mainly used to make auto parts, and the scale of using aluminum alloy materials to make auto parts is also getting bigger and bigger. Among them, auto parts products made of aluminum alloy materials cover auto bumpers, auto energy absorption boxes, auto battery frame beams, auto floor panels, and auto motor housings. The use of aluminum alloy materials to make the above auto parts mainly adopts aluminum extrusion molding process, and the aluminum extrusion molding process mainly relies on aluminum extrusion dies, so aluminum extrusion dies play a vital role in the entire aluminum alloy auto parts industry.

[0003] With the popularity of large-scale extrusion machines in China, there are more and more large-size aluminum extrusion dies. The cost of an aluminum extrusion die with an outer diameter of 580mm and a thickness of 380mm, which is usually suitable for an extrusion machine with a pressure of 3,600 tons, is about 50,000 to 60,000 yuan. If the aluminum extrusion die is damaged or a die bridge of the aluminum extrusion die is cracked due to unreasonable local design or immature extrusion process, the entire aluminum extrusion die will be scrapped, which will have a great impact on the project development stage of aluminum alloy products, seriously affecting the sample delivery time of aluminum alloy products and causing great economic losses.

[0004] In addition, with the development of the times and the advancement of science and technology, the performance requirements of aluminum-based materials in the field of new energy vehicles are becoming higher and higher. Among them, high-strength aluminum alloys of models 7003 and 7108 are mainly used to make front and rear bumpers of automobiles, while aluminum alloys of models 6082 and 6061 are mainly used to produce energy absorption boxes and battery trays (frames, front beams, rear beams and bottom plates, etc.). In the process of extruding automobile parts with high-strength aluminum alloys, the aluminum extrusion mold not only has to withstand high pressure, high temperature, eccentric loads and high impact loads for a long time, but also has to withstand high friction and local stress concentration. In the high-temperature working environment, the aluminum extrusion mold is easy to soften, resulting in insufficient support and elastic deformation or cracks in the mold bridge, etc., which in turn causes various dimensional deviations in the extruded products, so the aluminum extrusion mold needs to be scrapped. In the early stage of the development of new energy automobile parts, the scrapping cost of aluminum extrusion molds accounts for 60-80% of the total product project development cost. If a large number of aluminum extrusion molds are scrapped, the product development cost will increase significantly, seriously affecting the production efficiency of the enterprise.

[0005] The traditional method of repairing cracks in the die bridge of aluminum extrusion dies is: first use an electric grinder to grind away the cracks in the die bridge, and grind the position where the cracks in the die bridge are formed into a welding groove, and then use electric welding equipment to weld and fill the welding groove, so that the surface of the welding groove is consistent with the surface of other positions of the die bridge, and then grind and shape the welded filling position, or directly weld steel plates on both sides of the die bridge where the cracks are generated for reinforcement. However, this repair method is time-consuming and labor-intensive, and the effect is not good. It will also significantly change the metal flow of aluminum alloy during extrusion molding, causing the contour deviation of aluminum alloy products. With the increase in the number of machine operations, the position where the aluminum extrusion die originally cracked will crack again, and the aluminum extrusion die can only be scrapped in the end. In addition, the repair of the die bridge cracks of the aluminum extrusion die is affected by the technical ability of the die repairer. The repair status of each person for the same product is different, and it cannot be operated in batches. Therefore, the repair of the die bridge cracks of aluminum extrusion dies is a technical problem that the extrusion plant needs to solve. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for repairing a die bridge crack of an aluminum extrusion die, which can not only repair the die bridge crack of the aluminum extrusion die, but also extend the service life of the aluminum extrusion die.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] According to some embodiments of the present invention, a method for repairing a crack in a die bridge of an aluminum extrusion die comprises the following steps:

[0009] a. Grind the cracks. Grind the cracked position of the mold bridge and form a welding groove;

[0010] b. Processing the mortise and tenon blocks and the mortise and tenon grooves, producing and processing the mortise and tenon blocks, processing the mold after grinding the cracks in step a, processing the mortise and tenon grooves below the position where the cracks are generated in the mold bridge, the mortise and tenon grooves are formed by the outer side wall of the mold bridge being recessed into the interior of the mold bridge, and the shape of the mortise and tenon grooves is adapted to the shape of the mortise and tenon blocks;

[0011] c. Installing the mortise and tenon blocks, and correspondingly installing the mortise and tenon blocks in the mortise and tenon grooves of the side walls of the mold bridge;

[0012] d. Welding filling: After the mortise and tenon block is embedded in the mortise and tenon groove in step c, the welding groove of the mold bridge is welded and filled so that the surface of the mold bridge is restored to be flat.

[0013] Beneficial effects of a method for repairing a crack in a die bridge of an aluminum extrusion die according to certain embodiments of the present invention:

[0014] The mold bridge crack repair method of the present embodiment is to clean and grind the position where the crack occurs in the mold bridge to form a welding groove, then form a mortise and tenon groove below the position where the crack occurs in the mold bridge, and manufacture a mortise and tenon block that matches the mortise and tenon groove, and then embed the mortise and tenon block into the mortise and tenon groove accordingly. At this time, the mortise and tenon block can connect the front and rear ends of the position where the crack occurs in the mold bridge, so the mortise and tenon block can assist in supporting the mold bridge, and finally the welding groove is welded and filled to restore the surface of the mold bridge to be flat. By adopting the above-mentioned mold bridge crack repair method, the supporting force of the repaired mold bridge can be strengthened, the mold core deviation can be reduced, and at the same time it helps to extend the service life of the mold.

[0015] In certain embodiments of the present invention, in step a, an electric grinder is used to grind the position where the crack of the mold bridge is generated to form the welding groove, and the welding groove is an arc-shaped groove.

[0016] In certain embodiments of the present invention, the number of the mortise and tenon blocks is two; in the step b, the mortise and tenon grooves are respectively processed on the two side surfaces below the position where the cracks are generated in the mold bridge; in the step c, the two mortise and tenon blocks are embedded in the two mortise and tenon grooves one by one.

[0017] In certain embodiments of the present invention, the distance between the mortise and tenon groove and the position where the crack of the mold bridge occurs is 5mm-10mm.

[0018] In certain embodiments of the present invention, in the step c, the mold is first heated to 470° C.-490° C., and then the mortise and tenon block is embedded in the mortise and tenon groove.

[0019] In some embodiments of the present invention, the mortise and tenon block and the mortise and tenon groove are in interference fit.

[0020] In some embodiments of the present invention, the outer contour dimension of the mortise and tenon block is 0.15 mm-0.3 mm larger than the dimension of the mortise and tenon groove.

[0021] In certain embodiments of the present invention, in step c, the mortise and tenon block is first embedded in the mortise and tenon groove, and then a cover plate capable of covering the mortise and tenon block and the mortise and tenon groove is welded to the outer surface of the mold bridge.

[0022] In certain embodiments of the present invention, the thickness of the sealing plate is 2 mm-3 mm.

[0023] In certain embodiments of the present invention, in step d, after the welding groove is filled by welding, the two side surfaces of the other end of the mold bridge away from the welding groove are then polished so that an angle H is formed between the two side surfaces of the other end of the mold bridge away from the welding groove, satisfying 20°≤H≤60°. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a schematic diagram of the appearance structure of a mold in which the mold bridge crack repair method of certain embodiments of the present invention is used to grind the position where the mold bridge of the mold has cracks and form a welding groove;

[0026] Figure 2 It is a schematic diagram of the appearance structure of a mold with mortise and tenon grooves processed on both sides of the surface below the position where the crack of the mold bridge occurs;

[0027] Figure 3 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0028] Figure 4 for Figure 2 The enlarged schematic diagram of point B in the middle;

[0029] Figure 5 A schematic diagram of a mold structure for preparing to embed two mortise and tenon blocks into the mortise and tenon grooves on both sides of the mold bridge in a one-to-one correspondence;

[0030] Figure 6 A schematic diagram of a mold structure in which two mortise and tenon blocks are embedded in the mortise and tenon grooves on both sides of a mold bridge in a one-to-one correspondence;

[0031] Figure 7 It is a schematic diagram of a mold structure in which two mortise and tenon blocks are embedded in two mortise and tenon grooves one by one and sealing plates are welded on the outer surfaces of both sides of the mold bridge respectively;

[0032] Figure 8 It is a schematic diagram of the mold structure after sealing plates are welded on the outer surfaces of both sides of the mold bridge and the welding grooves are filled by welding;

[0033] Fig. 9 yes Figure 8 A schematic diagram of the cross-sectional structure along the CC line in the mold shown;

[0034] Fig.10 It is a schematic diagram of a mold structure in which the surfaces of both sides of the other end of the mold bridge away from the welding groove are ground to form an angle H;

[0035] Fig.11 It is a parts diagram of the mortise and tenon block and the sealing plate used in the mold bridge crack repair method of certain embodiments of the present invention. DETAILED DESCRIPTION

[0036] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, "several" means one or more, "more" means more than three, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0041] Reference Figures 1 to 11 , a method for repairing a mold bridge crack of an aluminum extrusion die according to certain embodiments of the present invention is sometimes referred to as a "mold bridge crack repair method" for ease of description.

[0042] A method for repairing a crack in a die bridge of an aluminum extrusion die comprises the following steps:

[0043] a. Grinding the cracks: grinding the position where the cracks are generated on the mold bridge 110 of the mold 100 to form a welding groove 120. In this embodiment, an electric grinding device is used to grind the position where the cracks are generated on the mold bridge 110, and the shape of the welding groove 120 is an arc concave shape, that is, the welding groove 120 is an arc groove;

[0044] b. Processing the mortise and tenon block 200 and the mortise and tenon groove 130, producing and processing the mortise and tenon block 200, processing the mold 100 after the cracks have been polished in step a, and processing the mortise and tenon groove 130 below the position where the cracks are generated in the mold bridge 110, the mortise and tenon groove 130 is formed by the outer wall of the mold bridge 110 being recessed into the inside of the mold bridge 110, and the shape of the mortise and tenon groove 130 is adapted to the shape of the mortise and tenon block 200. In this embodiment, the required mortise and tenon block 200 is processed by a CNC machine tool, and then the electrode is obtained by processing using a wire cutting machine, and the required mortise and tenon groove 130 is processed 5mm-10mm below the position where the cracks are generated in the mold bridge 110 by using an electric spark wire cutting machine in combination with the electrode, that is, the distance between the mortise and tenon groove 130 and the position where the cracks are generated in the mold bridge 110 is 5mm-10mm. In this embodiment, the mortise and tenon groove 130 is a dovetail groove, and the mortise and tenon block 200 is a dovetail block adapted to the shape of the dovetail groove;

[0045] c. Installing the mortise and tenon block 200, and correspondingly installing the mortise and tenon block 200 in the mortise and tenon groove 130 of the side wall of the mold bridge 110;

[0046] d. Welding filling: After the mortise and tenon block 200 is embedded in the mortise and tenon groove 130 in step c, the welding groove 120 of the mold bridge 110 is welded and filled so that the surface of the mold bridge 110 is restored to be flat.

[0047] The mold bridge crack repair method of the present embodiment is to clean and polish the position where the crack occurs in the mold bridge 110 to form a welding groove 120, then form a mortise and tenon groove 130 below the position where the crack occurs in the mold bridge 110, and manufacture a mortise and tenon block 200 that matches the mortise and tenon groove 130, and then embed the mortise and tenon block 200 in the mortise and tenon groove 130 accordingly. At this time, the mortise and tenon block 200 can connect the front and rear ends of the position where the crack occurs in the mold bridge 110, so that the mortise and tenon block 200 can assist in supporting the mold bridge 110, and finally weld and fill the welding groove 120 to restore the surface of the mold bridge 110 to be flat. By adopting the above-mentioned mold bridge crack repair method, the supporting force of the repaired mold bridge 110 can be strengthened, the mold core deviation can be reduced, and at the same time it helps to extend the service life of the mold 100.

[0048] A mold repaired by the mold bridge crack repair method of certain embodiments of the present invention was compared with a mold repaired by the traditional mold bridge crack repair method. It was found that the average amount of aluminum material that was subsequently used for extrusion aluminum forming without damage in the mold repaired by the traditional mold bridge crack repair method was 60.32 tons, while the average amount of aluminum material that was subsequently used for extrusion aluminum forming without damage in the mold repaired by the mold bridge crack repair method of certain embodiments of the present invention was 87.4 tons. The life of the mold repaired by the mold bridge crack repair method of certain embodiments of the present invention can be increased by an average of 44.89%.

[0049] In order to make the mortise and tenon block 200 better connect and support the die bridge 110, a die bridge crack repair method for an aluminum extrusion die according to some embodiments of the present invention comprises the following steps:

[0050] a. Grinding the cracks: grinding the position where the cracks are generated on the mold bridge 110 by using an electric grinding device, and making the shape of the welding groove 120 be a circular arc concave shape;

[0051] b. Processing the tenon block 200 and the tenon groove 130, producing and processing two tenon blocks 200, processing the mold 100 after the cracks are polished in step a, and processing the tenon grooves 130 on both sides of the surface below the position where the cracks are generated in the mold bridge 110, respectively, and the shapes of the two tenon blocks 200 are adapted to the shapes of the two tenon grooves 130;

[0052] c. Install the mortise and tenon blocks 200, and install the two mortise and tenon blocks 200 into the two mortise and tenon grooves 130 in a one-to-one correspondence;

[0053] d. Welding filling: After the two mortise and tenon blocks 200 are correspondingly embedded in the two mortise and tenon grooves 130 in step c, the welding grooves 120 of the mold bridge 110 are welded and filled so that the surface of the mold bridge 110 is restored to be flat.

[0054] The mold bridge crack repair method of the present embodiment is to process mortise and tenon grooves 130 on the two side surfaces below the position where the cracks occur in the mold bridge 110, and then embed the two mortise and tenon blocks 200 into the two mortise and tenon grooves 130 accordingly. At this time, the two mortise and tenon blocks 200 can connect the front and rear ends of the mortise and tenon blocks 200 from both sides of the mold bridge 110, and the mold bridge 110 is connected and supported by the two mortise and tenon blocks 200, thereby greatly improving the supporting force of the mold bridge 110.

[0055] In order to better fit the mortise and tenon block 200 into the mortise and tenon groove 130, a method for repairing a crack in a die bridge of an aluminum extrusion die according to some embodiments of the present invention comprises the following steps:

[0056] a. Grinding the cracks: grinding the position where the cracks are generated on the mold bridge 110 by using an electric grinding device, and making the shape of the welding groove 120 be a circular arc concave shape;

[0057] b. Processing the tenon block 200 and the tenon groove 130, producing and processing two tenon blocks 200, processing the mold 100 after the cracks are polished in step a, and processing the tenon grooves 130 on both sides of the surface below the position where the cracks are generated in the mold bridge 110, respectively, and the shapes of the two tenon blocks 200 are adapted to the shapes of the two tenon grooves 130;

[0058] c. Install the mortise and tenon blocks 200. First, heat the mold 100 with two mortise and tenon grooves 130 to 470°C-490°C, and then install the two mortise and tenon blocks 200 in the mortise and tenon grooves 130. In this embodiment, the mold 100 with two mortise and tenon grooves 130 is first placed in a heating furnace to heat to 470°C-490°C, and then the mold 100 is kept warm for 1-2 hours, and then the two mortise and tenon blocks 200 are installed one by one in the mortise and tenon grooves 130 on both sides of the mold bridge 110;

[0059] d. Welding filling: After the two mortise and tenon blocks 200 are correspondingly embedded in the two mortise and tenon grooves 130 in step c, the welding grooves 120 of the mold bridge 110 are welded and filled so that the surface of the mold bridge 110 is restored to be flat.

[0060] In certain embodiments of the mold bridge crack repair method of the present invention, the mold 100 is first heated to 470°C-490°C, so that the mortise and tenon groove 130 is expanded by the heat, which facilitates the mortise and tenon block 200 to be embedded in the mortise and tenon groove 130. When the mold 100 cools and shrinks, the mortise and tenon groove 130 shrinks accordingly to clamp the mortise and tenon block 200, and the gap between the mortise and tenon block 200 and the mortise and tenon groove 130 is smaller, and the connection between the mortise and tenon block 200 and the mortise and tenon groove 130 is tighter.

[0061] In order to make the fit between the mortise and tenon block 200 and the mortise and tenon groove 130 tighter, in certain embodiments of the present invention, the mortise and tenon block 200 and the mortise and tenon groove 130 are interference fit, specifically, the outer contour dimension of the mortise and tenon block 200 is 0.15mm-0.3mm larger than the dimension of the mortise and tenon groove 130, that is, when producing and processing the mortise and tenon block 200, the dimension of the mortise and tenon block 200 can be processed to be 0.15mm-0.3mm larger than the dimension of the mortise and tenon groove 130, so when the mortise and tenon block 200 is subsequently embedded in the mortise and tenon groove 130, the connection between the mortise and tenon block 200 and the mortise and tenon groove 130 is tighter.

[0062] After the mold 100 is used to extrude aluminum, it is necessary to soak the mold 100 in caustic soda to eliminate the aluminum alloy material remaining on the surface of the mold 100. During this process, the caustic soda will penetrate into the gap between the mortise and tenon block 200 and the mortise and tenon groove 130. When the mold 100 is subsequently used for aluminum extrusion molding, the alkali liquid remaining in the gap between the mortise and tenon block 200 and the mortise and tenon groove 130 may flow out and mix into the aluminum alloy material, thereby seriously affecting the performance of the extruded product.

[0063] In order to prevent cleaning liquids such as caustic soda from penetrating into the gap between the tenon block 200 and the tenon groove 130, a method for repairing a crack in a die bridge of an aluminum extrusion die according to some embodiments of the present invention comprises the following steps:

[0064] a. Grinding the cracks: grinding the position where the cracks are generated on the mold bridge 110 by using an electric grinding device, and making the shape of the welding groove 120 be a circular arc concave shape;

[0065] b. Processing the tenon block 200 and the tenon groove 130, producing and processing two tenon blocks 200, processing the mold 100 after the cracks are polished in step a, and processing the tenon grooves 130 on both sides of the surface below the position where the cracks are generated in the mold bridge 110, respectively, and the shapes of the two tenon blocks 200 are adapted to the shapes of the two tenon grooves 130;

[0066] c. Install the mortise and tenon blocks 200. First, heat the mold 100 with two mortise and tenon grooves 130 to 470°C-490°C, then install the two mortise and tenon blocks 200 in the mortise and tenon grooves 130, and then weld a sealing plate 300 on the outer surface of the mold bridge 110 to cover the mortise and tenon blocks 200 and the mortise and tenon grooves 130. In this embodiment, first, put the mold 100 with two mortise and tenon grooves 130 into a heating furnace to heat to 470°C-490°C, then keep the mold 100 warm for 1-2 hours, then install the two mortise and tenon blocks 200 in a one-to-one correspondence inside the mortise and tenon grooves 130 on both sides of the mold bridge 110, and then weld a sealing plate 300 on both sides of the outer surface of the mold bridge 110, each sealing plate 300 can cover and seal the mortise and tenon blocks 200 and the mortise and tenon grooves 130 on one side of the mold bridge 110;

[0067] d. Welding filling: After the two sealing plates 300 are correspondingly welded to the two side surfaces of the mold bridge 110 in step c, the welding grooves 120 of the mold bridge 110 are welded and filled to restore the surface of the mold bridge 110 to be flat.

[0068] By adopting the above method, the sealing plate 300 is sealed and welded to the surface of the mold bridge 110, and then the sealing plate 300 can cover the gap between the mortise and tenon block 200 and the mortise and tenon groove 130 on the lower surface of the sealing plate 300. Even if the mold 100 is subsequently immersed in a cleaning liquid such as caustic soda, the cleaning liquid such as caustic soda will not penetrate into the gap between the mortise and tenon block 200 and the mortise and tenon groove 130, which facilitates the subsequent use of the mold 100 for extruded aluminum forming production.

[0069] In order to ensure the sealing effect of the sealing plate 300, in some embodiments of the present invention, the thickness of the sealing plate 300 is 2mm-3mm. By setting the thickness of the sealing plate 300 to 2mm-3mm, it is ensured that the sealing plate 300 has a certain structural strength, and the sealing plate 300 can withstand a certain pressure without bursting unexpectedly, and at the same time, the thickness of the mold bridge 110 will not be greatly increased, so that the mold 100 is convenient for subsequent use in extrusion aluminum forming production.

[0070] Since welding the sealing plate 300 on the surface of the die bridge 110 will increase the thickness of the die bridge 110, the extruded aluminum flow rate of the die bridge 110 will be slowed down. In order to restore the extruded aluminum flow rate of the die bridge 110, a die bridge crack repair method for an aluminum extrusion die according to some embodiments of the present invention includes the following steps:

[0071] a. Grinding the cracks: grinding the position where the cracks are generated on the mold bridge 110 by using an electric grinding device, and making the shape of the welding groove 120 be a circular arc concave shape;

[0072] b. Processing the tenon block 200 and the tenon groove 130, producing and processing two tenon blocks 200, processing the mold 100 after the cracks are polished in step a, and processing the tenon grooves 130 on both sides of the surface below the position where the cracks are generated in the mold bridge 110, respectively, and the shapes of the two tenon blocks 200 are adapted to the shapes of the two tenon grooves 130;

[0073] c. Install the mortise and tenon blocks 200. First, put the mold 100 with two mortise and tenon grooves 130 processed into a heating furnace to heat it to 470°C-490°C. Then, keep the mold 100 warm for 1-2 hours. Then, install the two mortise and tenon blocks 200 into the mortise and tenon grooves 130 on both sides of the mold bridge 110 one by one. Then, weld a sealing plate 300 on both sides of the outer surface of the mold bridge 110. Each sealing plate 300 can cover and seal the mortise and tenon blocks 200 and the mortise and tenon grooves 130 on one side of the mold bridge 110.

[0074] d. Welding filling: After the two sealing plates 300 are correspondingly welded to the two side surfaces of the mold bridge 110 in step c, the welding groove 120 of the mold bridge 110 is welded and filled to make the surface of the mold bridge 110 smooth again. Fig.11As shown, the two side surfaces of the other end of the mold bridge 110 away from the welding groove 120 are then polished so that an angle H is formed between the two side surfaces of the other end of the mold bridge 110 away from the welding groove 120, satisfying 20°≤H≤60°.

[0075] By adopting the above-mentioned method, the surfaces on both sides of the other end of the welded repaired mold bridge 110 are polished to form an angle H, 20°≤H≤60°, so that the other end of the welded repaired mold bridge 110 forms an acute angle. Therefore, when the mold 100 is used for extrusion aluminum forming, the flow rate of the aluminum alloy material flowing through the acute angle of the other end of the welded repaired mold bridge 110 will be accelerated, thereby compensating for the flow rate of the aluminum alloy material at the welded repaired end of the mold bridge 110, so that when the welded repaired mold bridge 110 is used for extrusion aluminum forming, the flow rate of the extruded aluminum metal flowing through the mold bridge 110 remains basically unchanged.

[0076] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A method for repairing a crack in a die bridge of an aluminum extrusion die, characterized in that: The following steps are involved: a. grinding the cracks, grinding the position where the cracks are generated on the mold bridge (110) of the mold (100) and forming a welding groove (120); b. Processing the mortise and tenon block (200) and the mortise and tenon groove (130), producing and processing the mortise and tenon block (200), processing the mold (100) after the cracks have been polished in step a, and processing the mortise and tenon groove (130) below the position where the cracks are generated on the mold bridge (110), wherein the mortise and tenon groove (130) is formed by the outer wall of the mold bridge (110) being recessed into the interior of the mold bridge (110), and the shape of the mortise and tenon groove (130) is adapted to the shape of the mortise and tenon block (200); c. Installing the mortise and tenon block (200), and installing the mortise and tenon block (200) correspondingly in the mortise and tenon groove (130) on the side wall of the mold bridge (110); d. Welding filling: after the mortise and tenon block (200) is embedded in the mortise and tenon groove (130) in step c, the welding groove (120) of the mold bridge (110) is welded and filled so that the surface of the mold bridge (110) is restored to be flat.

2. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 1, characterized in that: In the step a, an electric grinder is used to grind the position where the crack of the mold bridge (110) is generated to form the welding groove (120), and the welding groove (120) is an arc-shaped groove.

3. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 1, characterized in that: The number of the mortise and tenon blocks (200) is two; In the step b, the mortise and tenon grooves (130) are respectively machined on the surfaces on both sides below the position where the cracks are generated on the mold bridge (110); In the step c, the two mortise and tenon blocks (200) are embedded in the two mortise and tenon grooves (130) in a one-to-one correspondence.

4. A method for repairing a crack in a die bridge of an aluminum extrusion die according to any one of claims 1 to 3, characterized in that: The distance between the mortise and tenon groove (130) and the position where the crack of the mold bridge (110) is generated is 5mm-10mm.

5. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 1, characterized in that: In the step c, the mold (100) is first heated to 470° C.-490° C., and then the mortise and tenon block (200) is embedded in the mortise and tenon groove (130).

6. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 5, characterized in that: The mortise and tenon block (200) and the mortise and tenon groove (130) are in interference fit.

7. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 6, characterized in that: The outer contour dimension of the mortise and tenon block (200) is 0.15 mm to 0.3 mm larger than the dimension of the mortise and tenon groove (130).

8. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 1, characterized in that: In the step c, the mortise and tenon block (200) is first embedded in the mortise and tenon groove (130), and then a cover plate (300) capable of covering the mortise and tenon block (200) and the mortise and tenon groove (130) is welded to the outer surface of the mold bridge (110).

9. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 8, characterized in that: The thickness of the sealing plate (300) is 2 mm to 3 mm.

10. A method for repairing a crack in a die bridge of an aluminum extrusion die according to claim 1, characterized in that: In the step d, after the welding groove (120) is welded and filled, the two side surfaces of the other end of the mold bridge (110) away from the welding groove (120) are then polished, so that an angle H is formed between the two side surfaces of the other end of the mold bridge (110) away from the welding groove (120), satisfying 20°≤H≤60°.

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