A spraying protection device, a spraying method

Abstract

The present invention discloses a spraying protection device and a spraying method, which relate to the technical field of high-pressure cold spraying; the spraying protection device includes a cover plate main body, a baffle plate and a clamping plate. Among them, the cover plate main body is used to cover the concave area of the product; the baffle plate is detachably installed on the cover plate main body to block the area to be protected of the product; the clamping plate is arranged at the end of the cover plate main body, and the clamping plate is used to cooperate with the inner side of the concave area to position the cover plate main body. The spraying protection device provided by the present invention can effectively protect the parts that do not need to be sprayed, reduce the powder consumption, improve the spraying efficiency, and can minimize the subsequent cleaning and maintenance work, greatly improving the finished product rate of product remanufacturing and repair.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure cold spraying, and more specifically, to a spraying protection device. In addition, the present invention also relates to a spraying method applied to the above-mentioned spraying protection device. Background Art

[0002] The axle box body in the running mechanism of a high-speed train is mainly used to support the weight of the whole vehicle and the sand spraying device, and is connected to the mounting arm of the obstacle removal device, and bears the alternating load during vehicle operation. Due to the complex working conditions during vehicle operation, the bolt connection part of the axle box body mounting surface is easily affected by electrochemical corrosion and wear, resulting in corrosion pits that affect the assembly accuracy, and further threatening the driving safety.

[0003] Currently, high-pressure cold spraying technology is generally used to remanufacture and repair the corrosion pits around the threaded holes. Since the corrosion area is irregular in shape, it is difficult to strictly scan and repair according to the contour of the corrosion area. To ensure complete coverage of the repair area, it is often necessary to remove the corrosion products. Due to the various shapes of the processing areas, it is difficult to set the repair path of the manipulator, and a large amount of powder is wasted. In addition, to ensure the uniformity of the spray gun movement speed and the repair quality of the corrosion area, the spray gun needs to move a certain distance beyond the edge of the repair area before turning back, resulting in too large an overspray area and difficulty in removing the overspray material in the concave part. Moreover, once the spraying material accumulates at the threaded hole part, it will seriously affect the assembly.

[0004] In the related art, the overspray material on the same reference plane as the repair area can be removed by machining. During the removal process, the un-repaired surface will be damaged, resulting in a further reduction in the size of the center distance from the axle box body mounting surface to the center of the center hole. The concave part needs to be manually polished and cleaned, which is time-consuming and laborious, increases the labor cost, and the polished surface is relatively rough, affecting the product appearance. The threaded hole part is cleaned by tapping, but tapping has a certain damage rate to the threaded hole and is not repairable.

[0005] In summary, how to reduce the cleaning work after high-pressure cold spraying is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0006] In view of this, an object of the present invention is to provide a spraying protection device, which can protect the non-spraying area, reduce the powder consumption, improve the spraying efficiency, and can minimize the subsequent cleaning and maintenance work, greatly improving the finished product rate of product remanufacturing and repair.

[0007] Another object of the present invention is to provide a spraying method applied to the above-mentioned spraying protection device.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A spraying protection device for protecting a product to be sprayed. The product is provided with a concave area and a threaded hole. The side edge inside the concave area is an inclined surface that gradually inclines outward from the bottom surface of the concave area to its opening. The spraying protection device includes:

[0010] A cover plate main body for covering the concave area of the product;

[0011] A baffle plate detachably installed on the cover plate main body to block the area to be protected of the product;

[0012] A clamping plate arranged at the end of the cover plate main body. The clamping plate is used to cooperate with the side edge inside the concave area to position the cover plate main body.

[0013] Optionally, the cover plate main body is provided with a guide groove, and the baffle plate is slidably arranged in the guide groove.

[0014] Optionally, the guide groove is arranged on the side of the cover plate main body facing the concave area, and the end of the guide groove is flush with the edge of the cover plate main body.

[0015] Optionally, the baffle plate is a rectangular baffle plate or a T-shaped baffle plate.

[0016] Optionally, the clamping plate is welded to the cover plate main body.

[0017] Optionally, it further includes a threaded hole plugging structure, and the threaded hole plugging structure includes:

[0018] A screw rod provided with an external thread for cooperating with the threaded hole;

[0019] A nut connected to the screw rod, and the size of the nut is larger than the outer diameter size of the screw rod.

[0020] Optionally, the top surface of the nut is provided with a flat groove;

[0021] And / or, along the axial direction of the nut, from the connection part of the nut and the screw rod to the top surface of the nut, the cross-sectional size of the nut first gradually increases and then gradually decreases.

[0022] Optionally, the cover plate main body is made of stainless steel, and a polyimide coating is provided on the surface of the cover plate main body.

[0023] Optionally, the baffle plate is a polyimide baffle plate; the screw rod is a polyimide screw rod, and the nut is a polyimide nut.

[0024] A spraying method applied to the spraying protection device described in any one of the above, and the spraying method includes:

[0025] Clean the corroded area of the product;

[0026] Obtain the maximum corrosion depth of the corroded area;

[0027] Machine the recessed area with the maximum corrosion depth as the machining depth;

[0028] Install the threaded hole plugging structure into the threaded hole of the product;

[0029] Install the baffle on the cover body, and install the cover body on the recessed area so that the clamping plate cooperates with the inner side of the recessed area;

[0030] Adjust the position of the baffle relative to the cover body;

[0031] Control the cold spray gun to perform spraying operations to complete spraying repair.

[0032] During the process of using the spraying protection device provided by the present invention, when it is necessary to perform repair spraying on the surface of the product, first, the baffle needs to be installed on the cover body, and the cover body with the baffle installed is fixed to the recessed area so that the clamping plate cooperates with the inner side of the recessed area to position the cover body and cover the surface that does not need to be sprayed to avoid overspraying.

[0033] Compared with the current solution, the spraying protection device provided by the present invention can effectively protect the parts that do not need to be sprayed, reduce the powder consumption, improve the spraying efficiency, and can minimize the subsequent cleaning and maintenance work, greatly improving the yield of product remanufacturing and repair.

[0034] In addition, the present invention also provides a spraying method applied to the above-mentioned spraying protection device. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0036] Figure 1 It is a cross-sectional view of the recessed area in the product;

[0037] Figure 2 It is a top view of a specific embodiment of the spraying protection device provided by the present invention;

[0038] Figure 3 It is a side view of a specific embodiment of the spraying protection device provided by the present invention;

[0039] Figure 4 Schematic structural diagram of a specific embodiment of the threaded hole plugging structure provided by the present invention;

[0040] Figure 5 Top view schematic diagram of the threaded hole plugging structure provided by the present invention;

[0041] Figure 6 Side view schematic diagram of a first specific embodiment of the baffle provided by the present invention;

[0042] Figure 7 Top view schematic diagram of a first specific embodiment of the baffle provided by the present invention;

[0043] Figure 8 Side view schematic diagram of a second specific embodiment of the baffle provided by the present invention;

[0044] Figure 9 Top view schematic diagram of a second specific embodiment of the baffle provided by the present invention;

[0045] Figure 10 Side view schematic diagram of a third specific embodiment of the baffle provided by the present invention;

[0046] Figure 11 Top view schematic diagram of a third specific embodiment of the baffle provided by the present invention;

[0047] Figure 12 Side view schematic diagram of a fourth specific embodiment of the baffle provided by the present invention;

[0048] Figure 13 Top view schematic diagram of a fourth specific embodiment of the baffle provided by the present invention;

[0049] Figure 14 Schematic structural diagram of the axle housing without the spraying protection device installed;

[0050] Figure 15 Schematic structural diagram of the axle housing with the spraying protection device installed;

[0051] Figure 16 Flow schematic diagram of the spraying method provided by the present invention.

[0052] Figures 1 - 16 Wherein:

[0053] 1 is the cover plate main body, 2 is the guide groove, 3 is the clamping plate, 4 is the threaded hole plugging structure, 41 is the screw rod, 42 is the nut, 421 is the flat groove, 5 is the baffle, 6 is the recessed area, 7 is the axle housing. Detailed implementation manners

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0055] The core of the present invention is to provide a spraying protection device, which can protect the non-spraying area, reduce the powder consumption, improve the spraying efficiency, and can minimize the subsequent cleaning and maintenance work, greatly improving the yield of product remanufacturing and repair.

[0056] Another core of the present invention is to provide a spraying method applied to the above spraying protection device.

[0057] Please refer to Figures 1 to 16 。

[0058] It should be noted that the product mentioned in the present invention can be the axle housing 7 or other products to be spray-coated and repaired, which is specifically determined according to the actual situation and will not be elaborated here.

[0059] This specific embodiment discloses a spraying protection device for protecting the product to be sprayed. The product is provided with a recessed area 6 and a threaded hole. The side inside the recessed area 6 is an inclined surface that gradually inclines outward from the bottom surface of the recessed area 6 to its opening. Specifically, as Figure 1 shown, Figure 1 is a schematic cross-sectional view of the recessed area 6. The angle c is the angle between the side surface and the bottom surface of the recessed area 6. Generally, the angle c is an acute angle less than 90°, and preferably, the angle c is not greater than 30°. The corner part is transitioned with an arc.

[0060] The spraying protection device includes a cover plate main body 1, a baffle 5, and a clamping plate 3. Among them, the cover plate main body 1 is used to cover the recessed area 6 of the product; the baffle 5 is detachably installed on the cover plate main body 1 to block the area to be protected of the product; the clamping plate 3 is arranged at the end of the cover plate main body 1, and the clamping plate 3 is used to cooperate with the side inside the recessed area 6 to position the cover plate main body 1.

[0061] During the process of using the spraying protection device provided in this specific embodiment, when it is necessary to repair and spray the surface of the product, first, the baffle 5 needs to be installed on the cover plate main body 1, and the cover plate main body 1 installed with the baffle 5 is fixed to the recessed area 6, so that the clamping plate 3 cooperates with the side inside the recessed area 6 to position the cover plate main body 1 and cover the surface that does not need to be sprayed to avoid overspraying.

[0062] To enable the cover plate body 1 to completely cover the recessed area 6, the size of the cover plate body 1 can be slightly larger than that of the recessed area 6. Specifically, the edge size of the cover plate body 1 can be 1 to 2 mm larger than the edge size of the recessed area 6. The cover plate body 1 is made of stainless steel, and a polyimide coating is provided on the surface of the cover plate body 1. The cover plate body 1 and the imide coating can be adhesively fixed with glue.

[0063] Compared with the current solution, the spraying protection device provided in this specific embodiment can effectively protect the parts that do not need to be sprayed, reduce the powder consumption, improve the spraying efficiency, and can minimize the subsequent cleaning and maintenance work, greatly improving the yield of product remanufacturing and repair.

[0064] Based on the above embodiment, a guide groove 2 can be provided on the cover plate body 1, and the baffle 5 can be slidably arranged in the guide groove 2.

[0065] Specifically, the specific shape of the guide groove 2 can be as Figure 2 shown. After the baffle 5 is installed in the guide groove 2 of the cover plate body 1, the length of the baffle 5 extending out can be adjusted by adjusting the position of the baffle 5 in the guide groove 2 to meet different spraying requirements. Preferably, the guide groove 2 can be welded to the cover plate body 1, and two groups of guide grooves 2 that are symmetric about the left and right are provided. The guide groove 2 can play a role in limiting and fixing the baffle 5.

[0066] In this specific embodiment, the baffle 5 and the cover plate body 1 are slidably connected through the guide groove 2, which is convenient for adjusting the extending length of the baffle 5 and is easy to install.

[0067] Furthermore, the guide groove 2 can be provided on the side of the cover plate body 1 facing the recessed area 6, and the end of the guide groove 2 is flush with the edge of the cover plate body 1 to avoid material accumulation in the guide groove 2 during the spraying process.

[0068] As Figure 3 shown is a cross-sectional schematic diagram of the spraying protection device. During the specific use process, the clamping plate 3 cooperates with the side surface of the recessed area 6 for positioning. The baffle 5 is slidably arranged in the guide groove 2. The cover plate body 1 is located in the recessed area 6, and by adjusting the size of the baffle 5 extending out of the guide groove 2, the requirements for different covering areas during the spraying process can be met.

[0069] As Figures 6 - 13 shown, the baffle 5 is a rectangular baffle or a T-shaped baffle. Among them, as Figure 6 、 Figure 7 shown, the baffle 5 is a rectangular baffle. As Figures 8 - 13 shown, the baffle 5 is a T-shaped baffle. Figures 8 - 13 Among them, the sizes of the T-shaped baffles are different and can be adjusted according to actual spraying requirements.

[0070] It should be noted that the baffle 5 and the guide groove 2 are in clearance fit, which not only needs to ensure flexible pulling and pushing, but also needs to have a certain limiting effect and is not easy to loosen.

[0071] Of course, according to different actual situations, the baffle 5 can also be set to other shapes.

[0072] Preferably, the clamping plate 3 can be welded to the cover plate body 1 to improve the connection reliability; at the same time, the clamping plate 3 can be set as a stainless steel clamping plate 3, and the included angle between the clamping plate 3 and the cover plate body 1 can be set to 60°-70° to facilitate clamping and fixing the spraying protection device.

[0073] In a specific embodiment, the spraying protection device further includes a threaded hole plugging structure 4, and the threaded hole plugging structure 4 includes: a screw rod 41 provided with an external thread for cooperating with the threaded hole; a nut 42 connected to the screw rod 41, and the size of the nut 42 is larger than the outer diameter size of the screw rod 41.

[0074] As Figure 4 shown, during the specific use process, the screw rod 41 can be partially screwed into the threaded hole to plug the threaded hole. At the same time, the size of the nut 42 is larger than the outer diameter size of the screw rod 41, and the threaded hole can be completely covered to avoid the blockage of the threaded hole.

[0075] Specifically, the screw rod 41 can be set as a polyimide screw rod, and the nut 42 can be set as a polyimide nut, which can avoid the adhesion of the spraying material on the surfaces of the screw rod 41 and the nut 42 and is convenient for cleaning.

[0076] In addition, as Figure 5 shown, a cross-shaped groove 421 can also be provided on the top surface of the nut 42 to facilitate the screwing of the threaded hole plugging structure 4; and / or, as Figure 4 shown, along the axial direction of the nut 42, from the connection part of the nut 42 and the screw rod 41 to the top surface of the nut 42, the cross-sectional dimension of the nut 42 first gradually increases and then gradually decreases to avoid interfering with the jet flow of the spray gun.

[0077] It should be noted that during the high-pressure cold spraying repair process of the axle box body 7, there should be a gap of 2 mm to 5 mm between the machining position and the edge of the threaded hole.

[0078] The spraying protection device provided by the present application can select different types of pull-out baffles 5 according to the size of the repair surface area, flexibly protect the non-repair surface, and the disassembly and installation operations are simple, and the components are easy to replace after damage. The baffle 5 component is made of polyimide material, and the surface of the cover plate body 1 is covered with a polyimide coating, which can effectively avoid the deposition of the spraying material, so as to achieve the purpose of reusing the components.

[0079] In addition to the above spraying protection device, the present invention also provides a spraying method applied to the spraying protection device disclosed in the above embodiments. The spraying method includes:

[0080] Step S1, cleaning the corroded area of the product;

[0081] In this step, the cleaning method for the surface to be repaired includes organic solvents such as alcohol and acetone. The flushing and wiping method is adopted and wiped repeatedly for 3 - 5 minutes.

[0082] Step S2, obtaining the maximum corrosion depth of the corroded area;

[0083] In this step, degreasing treatment can be carried out on the corroded area to facilitate the measurement of the corrosion pit depth. Measure the maximum depth of the corrosion pit in the corroded area. Use a corrosion pit depth measuring instrument to measure the corrosion pit depth. Measure 5 points from the outside to the inside and take the maximum value as the machining depth; determine the maximum machining depth of machining, determine the tool and machining parameters. After machining the corroded area, burrs, sharp edges, acute angles, etc. are not allowed to exist. Right angles or acute angles should be avoided at the edges and corners.

[0084] Step S3, machining the concave area 6 with the maximum corrosion depth as the machining depth;

[0085] In this step, when machining the corroded area, a high-speed steel Φ3mm milling cutter can be used. The rough milling cutting speed is 150 - 300m / min, the feed rate is 0.1 - 0.5mm / r, and the milling depth is 0.5 - 2mm. The finish milling cutting speed is 250 - 800m / min, and the feed rate is 0.03 - 0.1mm / r.

[0086] Step S4, installing the threaded hole plugging structure 4 into the threaded hole of the product;

[0087] Step S5, installing the baffle 5 on the cover plate body 1, and installing the cover plate body 1 on the concave area 6, so that the clamping plate 3 cooperates with the inner side of the concave area 6;

[0088] Step S6, adjusting the position of the baffle 5 relative to the cover plate body 1;

[0089] Step S7, controlling the cold spraying gun to perform spraying operation to complete spraying repair.

[0090] When the product is the axle box body 7, the cold spraying gun is in an up-and-down movement state, and the left and right two groups of repair areas are carried out separately, and the repair areas around the threaded hole are sprayed and repaired in sequence.

[0091] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other. Any combination of all the embodiments provided by the present invention falls within the protection scope of this invention, and will not be elaborated herein.

[0092] The above has introduced in detail the spraying protection device and spraying method provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A spraying protection device for protecting a product to be sprayed, wherein the product is provided with a concave area (6) and a threaded hole, and the side inside the concave area (6) is an inclined surface that gradually inclines outward from the bottom surface of the concave area (6) to its opening; characterized in that, The spray protection device includes: A cover plate body (1) for covering the concave area (6) of the product; A baffle (5) detachably mounted on the cover plate body (1) to shield the area to be protected of the product; A clamping plate (3) provided at the end of the cover plate body (1), and the clamping plate (3) is used to cooperate with the inner side of the concave area (6) to position the cover plate body (1); The cover plate body (1) is provided with a guide groove (2), and the baffle (5) is slidably arranged in the guide groove (2); The spray protection device further includes a threaded hole plugging structure (4), and the threaded hole plugging structure (4) includes: A screw rod (41) provided with an external thread for cooperating with the threaded hole; A nut (42) connected to the screw rod (41), and the size of the nut (42) is larger than the outer diameter of the screw rod (41).

2. The spraying protection device according to claim 1, characterized in that, The guide groove (2) is arranged on the side of the cover plate body (1) facing the concave area (6), and the end of the guide groove (2) is flush with the edge of the cover plate body (1).

3. The spraying protection device according to claim 1, characterized in that The baffle (5) is a rectangular baffle or a T-shaped baffle.

4. The spraying protection device according to any one of claims 1-3, characterized in that, The clamping plate (3) is welded to the cover plate body (1).

5. The spraying protection device according to claim 1, characterized in that, The top surface of the nut (42) is provided with a cross-shaped groove (421); And / or, along the axial direction of the nut (42), from the connection part of the nut (42) and the screw rod (41) to the top surface of the nut (42), the cross-sectional dimension of the nut (42) gradually increases first and then gradually decreases.

6. The spraying protection device according to claim 1, characterized in that, The cover plate body (1) is made of stainless steel, and the surface of the cover plate body (1) is provided with a polyimide coating.

7. The spraying protection device according to claim 6, characterized in that The baffle (5) is a polyimide baffle; the screw rod (41) is a polyimide screw rod, and the nut (42) is a polyimide nut.

8. A spraying method applied to the spray protection device according to any one of claims 5-7 above, and the spraying method includes: Cleaning the corroded area of the product; Obtaining the maximum corrosion depth of the corroded area; Processing the corroded area with the maximum corrosion depth as the processing depth; Installing the threaded hole plugging structure (4) in the threaded hole of the product; Installing the baffle (5) on the cover plate body (1), and installing the cover plate body (1) in the concave area (6) so that the clamping plate (3) cooperates with the inner side of the concave area (6); Adjusting the position of the baffle (5) relative to the cover plate body (1); Controlling the cold spraying gun to perform spraying operation to complete spraying repair.

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