Coating spray hole protection tool and coating spray method

Abstract

The invention discloses a coating spray hole protection tool and a coating spray method, wherein the protection tool comprises an elastic telescopic system, both ends of the elastic telescopic system are respectively connected with plugs, the elastic telescopic system is used to change the distance between the two plugs, the outer end face of the plug is provided with a plug chamfer, the plug is used to block the intersecting holes of the parts to be sprayed, and the plug chamfer is used to cooperate with the intersecting hole chamfer of the parts to be sprayed to form a powder containing area; the protection tool realizes that the size of the protection tool along its axial direction is retractable through the elastic telescopic system in cooperation with the plugs arranged at both ends, the intersecting holes of the parts to be sprayed can be blocked from the inside, the plug chamfer is arranged on the outer end face of the plug, and the intersecting hole chamfer is arranged at the orifice of the intersecting hole, the plug chamfer and the intersecting hole chamfer cooperate with each other to form a powder containing area, when the tool is taken out, only external force needs to be applied to the plug, the plug shrinks along the axis of the tool, the spray layer will be torn along the powder containing area around the orifice, thereby ensuring the integrity of the coating on the outer surface of the part.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a coating spraying hole protection tool and a coating spraying method. Background Art

[0002] Aircraft components have complex structures and harsh working conditions, especially with extremely demanding performance requirements for parts. In order to improve part performance, some parts will be sprayed with a layer of functional materials. Spraying usually uses thermal processes such as flame spraying. However, in some cases, there will be some assembly holes for connectors on the surface of the parts, so these holes need to be protected to prevent the spray layer from being sprayed onto the inner surface of the parts.

[0003] The traditional protection method is to use protection tools such as wooden plugs to protect the holes. However, in the thermal spraying process, protection tools such as wooden plugs are easy to ignite, cannot be reused, and will cause uneven spraying surface. When the protection tools are removed, the coating on the hole mouth is easy to peel off, which often causes spraying rework, high cost and low work efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art that protective tools such as wooden plugs are easily ignited during thermal spraying, cannot be reused and will cause uneven spraying surface, and the coating on the hole mouth is easily peeled off when the protective tool is removed, and to provide a coating spraying hole protection tool and a coating spraying method.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] A coating spray hole protection tool comprises an elastic telescopic system, both ends of which are respectively connected to plugs, the elastic telescopic system is used to change the distance between the two plugs, the plugs are provided with plug chamfers, the plugs are used to seal the intersecting holes of the parts to be sprayed, and the plug chamfers are used to cooperate with the chamfers of the intersecting holes of the parts to be sprayed to form a powder containing area.

[0007] The coating spray hole protection tool described in the present invention realizes the extension and retraction of the protection tool along its axial direction through the elastic telescopic system and the plugs set at both ends, that is, the axial length of the protection tool can be changed to ensure that the protection tool can be smoothly placed inside the part to be sprayed, and the intersecting holes of the part to be sprayed are blocked from the inside to prevent the spray layer from being sprayed onto the inner surface of the part to be sprayed. By setting a plug chamfer on the plug and setting an intersecting hole chamfer at the orifice of the intersecting hole of the part to be sprayed, the plug chamfer and the intersecting hole chamfer cooperate with each other to form a powder holding area. When the protection tool needs to be removed, it is only necessary to apply external force to the plug from the outside of the part, and the plug will shrink along the axis of the protection tool. Finally, the coating will be torn along the powder holding area around the orifice to form a fracture, thereby ensuring the integrity of the coating on the outer surface of the part.

[0008] Preferably, the outer end surface of the plug is a curved surface, and the curvature of the outer end surface of the plug is consistent with the outer surface of the part to be sprayed.

[0009] Preferably, the diameter of the plug extending into the intersecting hole is consistent with the hole diameter of the intersecting hole.

[0010] Preferably, the height of the plug extending into the intersecting hole portion is consistent with the wall thickness of the part to be sprayed.

[0011] With this structural setting, the curvature of the outer end faces of the two plugs is set to be consistent with the outer surface of the parts to be sprayed, the inner diameter of the plugs in the intersecting holes is set to be consistent with the aperture of the intersecting holes, and the height of the part of the plugs extending into the intersecting holes is set to be consistent with the wall thickness of the parts to be sprayed. This ensures that the plugs and the intersecting holes form a whole on the premise that the intersecting holes are blocked from the inside, and the surface of the parts to be sprayed is like a complete surface, ensuring a good protection effect. At the same time, no blind area for spraying will be formed to affect the uniformity of the coating.

[0012] Preferably, the elastic telescopic system includes an inner sleeve, an elastic member, a guide screw, and an outer sleeve. The outer sleeve is sleeved on the outside of the inner sleeve. The outer sleeve is slidably connected to the inner sleeve through the guide screw, and the elastic member is connected between the inner sleeve and the outer sleeve.

[0013] With this structural arrangement, relative sliding between the inner sleeve and the outer sleeve can be achieved by compressing the elastic member, and when the elastic force of the elastic member is released, the inner sleeve and the outer sleeve can be returned to their original positions.

[0014] Preferably, the inner sleeve has a guide groove for the guide screw to pass through, the guide screw slides in the guide groove, and the outer sleeve has a threaded hole for installing the guide screw.

[0015] Preferably, the upper portion of the guide screw is a thread, and the lower portion is a cylinder, the thread and the threaded hole are cooperatively connected, and the diameter of the cylinder is consistent with the groove width of the guide groove.

[0016] With this structural setting, the guide screw is fixed on the outer sleeve by cooperating with the thread and the threaded hole, and the cylinder is inserted into the guide groove. Since the cylinder and the guide groove are of the same size, the relative rotation of the inner sleeve and the outer sleeve is restricted, so that it can only perform linear telescopic movement along the direction of the guide groove.

[0017] Preferably, the inner sleeve outer end surface of the inner sleeve is a cambered surface, the camber of which is consistent with the inner surface of the part to be sprayed, and the outer sleeve outer end surface of the outer sleeve is a cambered surface, the camber of which is consistent with the inner surface of the part to be sprayed.

[0018] With this structural setting, the outer end surface of the inner sleeve is set to be consistent with the inner surface of the part to be sprayed, and the outer end surface of the outer sleeve is set to be consistent with the inner surface of the part to be sprayed, ensuring that the contact area with the part to be sprayed is maximized after the protection tool is assembled in place, thereby ensuring the stability of the protection tool.

[0019] A coating spraying method, using a coating spraying hole protection tool according to the present invention, comprises the following steps:

[0020] a. The intersecting holes on the parts to be sprayed are chamfered;

[0021] b. Installing a coating spray hole protection tool according to the present invention, compressing the two plugs to shorten the protection tool, and placing the protection tool into the part to be sprayed so that the intersecting holes are blocked by the plugs;

[0022] c. spraying a uniform coating onto the surface of the part to be sprayed, and after spraying, forming the powder containing area along the opening of the intersecting hole between the chamfer of the intersecting hole and the chamfer of the plug;

[0023] d. Pressing the plugs at both ends along the axis of the protection tool, the two plugs shrink along the axis, and the coating is torn along the powder containing area;

[0024] e. Continue to press the plug until the protective tool is removed.

[0025] By adopting a coating anti-shedding treatment process described in the present invention, due to the existence of the powder containing area, after spraying is completed, a recessed area will be formed around the intersecting hole along the hole mouth, that is, the powder containing area. When an external force is applied to the plug, the plug shrinks along the axis of the protective tool, and eventually the coating will be torn along the powder containing area to form a fracture. Since the powder containing area is a recessed area, the tensile force applied to the coating on the surface of the part to be sprayed by the shrinking movement of the plug is perpendicular to the surface direction of the part to be sprayed, so the coating will not be uncovered, but will be broken along the powder containing area, thereby ensuring the integrity of the coating of the part to be sprayed.

[0026] Preferably, the installation of the protection tool in step b comprises the following steps:

[0027] b1. The two plugs are respectively installed in the inner sleeve and the outer sleeve;

[0028] b2. The elastic member 3 is installed in the inner sleeve, the assembled outer sleeve is sleeved on the elastic member, the elastic member is compressed, so that the outer sleeve is sleeved on the inner sleeve;

[0029] b3. Adjust the position of the outer sleeve and the inner sleeve so that the threaded hole is aligned with the guide groove;

[0030] b4. Screw the guide screw into the threaded hole and insert the cylinder into the guide groove. Now the protection tool is assembled.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The coating spray hole protection tool described in the present invention realizes the retractable size of the protection tool along its axial direction through an elastic telescopic system in cooperation with the plugs arranged at both ends, ensuring that the protection tool can be smoothly placed inside the parts to be sprayed, and the intersecting holes of the parts to be sprayed are blocked from the inside to prevent the spray layer from being sprayed onto the inner surface of the parts. When the protection tool needs to be disassembled, it only needs to press the plugs on both sides to disassemble it, which is convenient for disassembly and assembly.

[0033] 2. After the plug of the protection tool is installed in place, it has good consistency with the surface of the part, just like a complete surface, avoiding the problem of the plug affecting the spraying and forming a blind area of ​​the spraying.

[0034] 3. By setting a plug chamfer on the plug and setting an intersecting hole chamfer on the intersecting hole of the part to be sprayed, the plug chamfer and the intersecting hole chamfer cooperate with each other to form a powder holding area. When taking out the protection tool, it is only necessary to apply external force to the plug from the outside of the part, and the plug will shrink along the axis of the protection tool. Finally, the spray layer will be torn along a circle of powder holding area around the hole to form a fracture, thereby ensuring the integrity of the coating on the outer surface of the part.

[0035] 4. The protective tool has a simple structure, is easy to install, is reusable, and is easy to disassemble and assemble, thus avoiding damage to the coating on the parts by disassembling the protective tool after the coating is sprayed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Assembly drawings for protection tools;

[0037] Figure 2 Exploded view for protection tools;

[0038] Figure 3 A top view of the part to be sprayed;

[0039] Figure 4 for Figure 3 Cross-sectional view of the part to be sprayed in the DD direction;

[0040] Figure 5 A top view of the protective tool being assembled on the part to be sprayed;

[0041] Figure 6 for Figure 5 Section view in the AA direction;

[0042] Figure 7 for Figure 6 Cross-sectional view in the middle BB direction;

[0043] Figure 8 for Figure 6 Enlarged view of the middle T zone;

[0044] Fig. 9 for Figure 6 Cross-sectional view in CC direction;

[0045] Fig.10 To protect the tool structure diagram;

[0046] Fig.11 for Fig.10 Cross-sectional view of compression state in the middle EE direction;

[0047] Fig.12 for Fig.10 Cross-sectional view of the extended state in the EE direction;

[0048] Fig.13 The three-dimensional structure diagram of the guide screw;

[0049] Fig.14 This is the front view of the guide screw;

[0050] Fig.15 It is the side view of the guide screw;

[0051] Fig.16 It is the top view of the guide screw;

[0052] Fig.17 To protect the tool assembly into the isometric view of the part to be sprayed;

[0053] Fig.18 Schematic diagram of coating anti-falling method Figure 1 ;

[0054] Fig.19 Schematic diagram of coating anti-falling method Figure 2 ;

[0055] Fig. 20 Indication of spraying method Figure 1 ;

[0056] Fig.21 Indication of spraying method Figure 2 .

[0057] Numbers in the figure: 1-plug, 11-outer end face of plug, 12-chamfer of plug, 2-inner sleeve, 21-outer end face of inner sleeve, 22-guide groove, 3-elastic member, 4-guide screw, 41-thread, 42-cylinder, 5-outer sleeve, 51-outer end face of outer sleeve, 52-threaded hole, 6-parts to be sprayed, 61-intersecting hole, 62-chamfer of intersecting hole, 7-powder containing area, 8-coating, 81-coating cutting line, 9-spray nozzle. DETAILED DESCRIPTION

[0058] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0059] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0060] Example 1

[0061] like Figure 1-17 As shown, a coating spray hole protection tool includes an elastic telescopic system and a plug 1, two plugs 1 are respectively located at the two ends of the elastic telescopic system, and a plug chamfer 12 is provided at the outer end face 11 of the plug 1. When spraying the outer cylindrical surface of the part 6 to be sprayed, since there is an intersecting hole 61 in the part 6 to be sprayed, in order to avoid spraying into the inside of the part 6 to be sprayed, two plugs 1 are needed to block the intersecting hole 61 before spraying, and the plug 1 cannot affect the uniformity of the coating 8 on the outer surface of the part after spraying. Therefore, the outer end face 11 of the plug 1 is set to an arc surface, and the arc is consistent with the outer surface of the part 6 to be sprayed; the radius of the part of the plug 1 extending into the intersecting hole 61 is basically consistent with the radius of the intersecting hole 61; the height of the part of the plug 1 extending into the intersecting hole 61 is consistent with the wall thickness of the part 6 to be sprayed, ensuring that after the protection tool is assembled, the spraying surface is like a complete surface, which not only ensures a good protection effect, but also does not form a spraying blind area to affect the uniformity of the coating.

[0062] The elastic telescopic system comprises an inner sleeve 2, an elastic member 3, a guide screw 4, and an outer sleeve 5. In this embodiment, the elastic member 3 is a spring. The spring is arranged between the inner sleeve 2 and the outer sleeve 5. The inner sleeve 2 is provided with a guide groove 22. The outer sleeve 5 is provided with a threaded hole 52 for installing the guide screw 4. The upper part of the guide screw 4 is a thread 41, and the lower part is a cylinder 42. The thread 41 and the threaded hole 52 match each other. The diameter of the cylinder 42 is substantially consistent with the width of the guide groove 22. The outer sleeve 5 is sleeved on the outer side of the inner sleeve 2, the guide groove 22 is aligned with the threaded hole 52, and the guide screw 4 is tightened. At this time, the cylinder 42 is inserted into the guide groove 22, which limits the relative rotation of the inner sleeve 2 and the outer sleeve 5, so that it can only perform linear telescopic movement along the direction of the guide groove 22.

[0063] To ensure that the protective tool can be firmly stuck on the inner wall of the part to be sprayed 6 after being assembled in place, the outer end face 21 of the inner sleeve 2 is set to be an arc surface, and the curvature is consistent with the inner surface of the part to be sprayed 6, and the outer end face 51 of the outer sleeve 5 is a circular arc surface, and the curvature is consistent with the inner surface of the part to be sprayed 6.

[0064] like Fig.11As shown, under the elastic force of the spring, the two plugs 1 are in a fully extended state, and the inner sleeve 2 is also in a longest extended state. At this time, the entire protection tool is the longest; Fig.12 As shown, when external force acts on the two plugs 1, the spring is compressed, one plug 1 retracts into the inner sleeve 2, and the other plug 1 retracts into the outer sleeve 5. When pressure continues to be applied, the inner sleeve 2 also slowly shrinks into the outer sleeve 5 until it reaches the extreme position, at which time the entire protection tool is the shortest.

[0065] Example 2

[0066] like Figure 18-21 As shown, based on Example 1, the present invention further discloses a coating spraying method, using a coating spraying hole protection tool described in the present invention, comprising the following steps:

[0067] a. Before spraying, the intersecting hole 61 on the part to be sprayed 6 is chamfered 62;

[0068] b1. Install the two plugs 1 into the inner sleeve 2 and the outer sleeve 5 respectively;

[0069] b2. Insert the spring between the inner sleeve 2 and the outer sleeve 5, compress the spring so that the outer sleeve 5 is sleeved on the inner sleeve 2;

[0070] b3. Rotate the outer sleeve 5 and the inner sleeve 2 so that the threaded hole 52 is aligned with the guide groove 22;

[0071] b4. The guide screw 4 is screwed into the threaded hole 52, so that the cylinder 42 is inserted into the guide groove 22, limiting the relative rotation between the inner sleeve 2 and the outer sleeve 5, and completing the assembly of the protection tool;

[0072] b5. Compress the two plugs 1, put the protection tool into the part 6 to be sprayed, and adjust the position of the protection tool so that the intersecting hole 61 is blocked by the two plugs 1.

[0073] c. Fig. 20 As shown, align the nozzle 9 so that its nozzle position is at the same height as the axis of the part 6 to be sprayed. Fig. 20 The solid arc arrow or the dashed arc arrow direction rotates uniformly around the axis; Fig.21 As shown, the nozzle 9 is turned on, and at the same time, the nozzle 9 reciprocates along the axis of the part to be sprayed 6 as shown by the solid arrow in the figure, spraying a uniform coating 8 on the surface of the part to be sprayed 6, and after the spraying is completed, a powder holding area 7 is formed along the hole opening of the intersecting hole 61 in the area where the intersecting hole chamfer 62 contacts the plug chamfer 12;

[0074] d. A force F is applied to the plugs 1 at both ends of the protection tool along the axis of the protection tool, and the two plugs 1 shrink along the axis. Since there will be a concave powder containing area 7 around the intersecting hole 61 after spraying, and since the tensile force applied to the coating 8 by the shrinking movement of the plug 1 is directed from the coating 8 to the substrate of the part 6 to be sprayed, the coating 8 will not be uncovered, but will be torn along the coating cutting line 81;

[0075] e. Continue to press the plug 1 until the protective tool is removed.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coating spray hole protection tool, It is characterized in that The invention comprises an elastic telescopic system, wherein both ends of the elastic telescopic system are respectively connected to plugs (1), the elastic telescopic system is used to change the distance between the two plugs (1), the plugs (1) are provided with plug chamfers (12), the plugs (1) are used to block the intersecting holes (61) of the parts to be sprayed (6), and the plug chamfers (12) are used to cooperate with the intersecting hole chamfers (62) of the parts to be sprayed (6) to form a powder containing area (7).

2. A coating spray hole protection tool according to claim 1, It is characterized in that The plug outer end surface (11) of the plug (1) is a curved surface, and the curvature of the plug outer end surface (11) is consistent with the outer surface of the part (6) to be sprayed.

3. A coating spray hole protection tool according to claim 1, It is characterized in that The diameter of the plug (1) extending into the intersecting hole (61) is consistent with the hole diameter of the intersecting hole (61).

4. A coating spray hole protection tool according to claim 1, It is characterized in that The height of the portion of the plug (1) extending into the intersecting hole (61) is consistent with the wall thickness of the part (6) to be sprayed.

5. A coating spray hole protection tool according to claim 1, It is characterized in that The elastic telescopic system comprises an inner sleeve (2), an elastic member (3), a guide screw (4), and an outer sleeve (5); the outer sleeve (5) is sleeved on the outside of the inner sleeve (2); the outer sleeve (5) is slidably connected to the inner sleeve (2) via the guide screw (4); and the elastic member (3) is connected between the inner sleeve (2) and the outer sleeve (5).

6. A coating spray hole protection tool according to claim 5, It is characterized in that The inner sleeve (2) has a guide groove (22) for the guide screw (4) to pass through, and the guide screw (4) slides in the guide groove (22). The outer sleeve (5) has a threaded hole (52) for mounting the guide screw (4).

7. A coating spray hole protection tool according to claim 6, It is characterized in that The upper portion of the guide screw (4) is a thread (41), and the lower portion is a cylinder (42); the thread (41) and the threaded hole (52) are connected to each other in a cooperative manner; the diameter of the cylinder (42) is consistent with the slot width of the guide slot (22).

8. A coating spray hole protection tool according to claim 5, It is characterized in that The inner sleeve outer end surface (21) of the inner sleeve (2) is a curved surface, the curvature of which is consistent with the inner surface of the part (6) to be sprayed, and the outer sleeve outer end surface (51) of the outer sleeve (5) is a curved surface, the curvature of which is consistent with the inner surface of the part (6) to be sprayed.

9. A coating spraying method, It is characterized in that Using a coating spray hole protection tool according to any one of claims 1 to 8 comprises the following steps: a. The intersecting hole (61) on the part to be sprayed (6) has an orifice-shaped intersecting hole chamfer (62); b. Installing a coating spray hole protection tool as described in any one of claims 1 to 8, compressing the two plugs (1) to shorten the protection tool, and placing the protection tool into the part to be sprayed (6), so that the intersecting hole (61) is blocked by the plug (1); c. spraying a uniform coating (8) onto the surface of the part to be sprayed (6), and after spraying, forming the powder containing area (7) along the opening of the intersecting hole (61) between the intersecting hole chamfer (62) and the plug chamfer (12); d. Pressing the plugs (1) at both ends along the axis of the protection tool, the two plugs (1) shrink along the axis, and the coating (8) is torn along the powder containing area (7); e. Continue to press the plug (1) until the protective tool is removed.

10. A coating spraying method according to claim 9, It is characterized in that The installation of the protection tool in step b comprises the following steps: b1. The two plugs (1) are respectively inserted into the inner sleeve (2) and the outer sleeve (5); b2. inserting the elastic member (3) into the inner sleeve (2), sleeve the assembled outer sleeve (5) onto the elastic member (3), compressing the elastic member (3), so that the outer sleeve (5) is sleeved onto the inner sleeve (2); b3. Adjust the position of the outer sleeve (5) and the inner sleeve (2) so that the threaded hole (52) is aligned with the guide groove (22); b4. Screw the guide screw (4) into the threaded hole (52), and insert the cylinder (42) into the guide groove (22). At this point, the protection tool is assembled.

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