A tool for correcting the flatness of a workpiece after thermal spraying

Abstract

The utility model relates to thermal spraying industry field, concretely is a kind of tooling for correcting workpiece flatness after thermal spraying. Including tooling body, tooling body includes upper die and lower die, and upper die and lower die are both flat plate structure, part is located between lower die and upper die, and tooling body is provided with several U-shaped fixtures, the U-shaped fixture includes upper fixed plate and lower fixed plate, and upper fixed plate is provided with adjusting mechanism for adjusting the distance between upper fixed plate and lower fixed plate, and the correction of part is realized by the cooperation of tooling body, U-shaped fixture and adjusting mechanism. The utility model can realize the correction of part flatness, and the upper die and lower die can be perfectly cut together by the mutual cooperation between convex step structure and concave step structure, avoid the dislocation between the two, ensure the normal use of the tooling.

Description

Technical Field

[0001] This utility model relates to the field of thermal spraying, specifically a tooling for correcting the flatness of a workpiece after thermal spraying. Background Technology

[0002] To reduce weight and fuel consumption, many parts of modern fighter jets employ thin-walled structures with a base material thickness of approximately 1 mm, primarily manufactured through sheet metal forming or 3D printing. To achieve radar stealth, a radar-absorbing coating is applied to the surface of the parts using thermal spraying technology. However, the production process can easily introduce stress, causing part deformation and failing to meet precision requirements; therefore, tooling is necessary for corrective shaping.

[0003] Specifically, thermal spraying production involves three core processes, each of which can potentially cause deformation. Surface pretreatment: Sandblasting is commonly used, where compressed air drives abrasive particles to impact the part's surface, removing impurities and increasing roughness. However, thin-walled parts have low rigidity, and the impact of abrasive particles easily causes plastic deformation. Thermal spraying: Molten or semi-molten material is sprayed through a high-speed airflow, colliding with the substrate and filling the surface irregularities. As the particles condense, their volume shrinks, creating tensile forces on the substrate and causing macroscopic deformation. Part heat treatment: Thin-walled structures inherently have poor thermal stability, and the coating and substrate materials have different coefficients of thermal expansion. The internal stresses during heating and cooling are complex and variable, making deformation difficult to control.

[0004] Therefore, there is an urgent need to design a tooling to correct the flatness of workpieces after thermal spraying in order to straighten the parts. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and to propose a tooling for correcting the flatness of workpieces after thermal spraying.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A fixture for correcting the flatness of a workpiece after thermal spraying includes a fixture body, which includes an upper mold and a lower mold, both of which are flat plate structures. The part is located between the lower mold and the upper mold. The fixture body is provided with a plurality of C-shaped clamps, each of which includes an upper fixed plate and a lower fixed plate. The upper fixed plate is provided with an adjustment mechanism for adjusting the distance between the upper fixed plate and the lower fixed plate. The correction of the part is achieved by the cooperation of the fixture body, the C-shaped clamps and the adjustment mechanism.

[0007] Furthermore, the adjusting mechanism includes a threaded rod, the upper fixed plate is provided with a threaded hole, the threaded rod is screwed into the threaded hole, the lower end of the threaded rod abuts against the upper mold, and the lower surface of the lower mold contacts the upper surface of the lower fixed plate.

[0008] Furthermore, the distance between the upper fixing plate and the lower fixing plate is greater than the sum of the thicknesses of the upper mold and the lower mold.

[0009] Furthermore, the upper mold has bosses at its four corners and the lower mold has recesses at its four corners, with the bosses and recesses matching each other.

[0010] Furthermore, handles are provided on both the upper and lower side walls.

[0011] Furthermore, one end of the upper fixing plate and one end of the lower fixing plate are connected by a connecting plate, which is provided with a scale.

[0012] Furthermore, a pad is detachably provided between the upper mold and the lower mold.

[0013] Furthermore, let X be the thickness of the part with the coating on its surface and H be the thickness of the pad, then (1+0.08)X≥H≥(1+0.05)X.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) This utility model can correct the flatness of the parts. By cooperating with the convex step structure and the concave step structure, the upper mold and the lower mold can fit together perfectly, avoiding misalignment between them and ensuring the normal use of the tooling.

[0015] (2) In this utility model, the distance between the upper mold and the lower mold is adjusted by the pad block, so that the upper mold and the lower mold can just hold the thin-walled or flat part in place under the action of the pad block. The pad can be regarded as a limiting part, which can prevent the thin-walled or flat part from moving or even falling off during the process of the upper mold and the lower mold holding it in place.

[0016] (3) In this utility model, the thickness of the clamp is precisely adjusted by the clamp and the scale on the clamp, so that the thickness of the clamp is equal to the overall thickness of the upper and lower molds when the parts are clamped, ensuring that the upper and lower molds clamp the parts tightly together.

[0017] In summary, this utility model can fix the upper and lower molds with a C-shaped clamp, and adjust the opening size of the C-shaped clamp with an adjustment mechanism until the flatness of the part is pressed to the required range, thereby achieving the correction of the part. Attached Figure Description

[0018] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the C-shaped clamp of this utility model; Figure 4 This is a schematic diagram of the pad block of this utility model.

[0021] Wherein: 1 is the lower mold; 2 is the upper mold; 3 is the pad block; 4 is the C-shaped clamp; 4-1 is the upper fixing plate; 4-2 is the lower fixing plate; 4-3 is the connecting plate. Detailed Implementation

[0022] Exemplary embodiments will be described in detail below. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Example

[0024] like Figure 1-4 As shown, a tooling for correcting the flatness of a workpiece after thermal spraying includes a tooling body, which includes an upper mold 2 and a lower mold 1. Both the upper mold 2 and the lower mold 1 are flat plate structures. The part is located between the lower mold 1 and the upper mold 2. The tooling body is provided with a plurality of C-shaped clamps 4. Each C-shaped clamp 4 includes an upper fixing plate 4-1 and a lower fixing plate 4-2. The upper fixing plate 4-1 is provided with an adjustment mechanism for adjusting the opening size of the C-shaped clamps 4. The tooling body, the C-shaped clamps 4 and the adjustment mechanism work together to achieve the correction of the part.

[0025] Specifically, such as Figure 1 As shown, first place the thin-walled or flat part on the lower mold 1, then cover the lower mold 1 with the upper mold 2, and then use the C-shaped clamp 4 to fix the upper mold 2 and the lower mold 1. Adjust the opening size of the C-shaped clamp 4 through the adjustment mechanism until the flatness of the part is pressed to the required range.

[0026] Furthermore, the adjustment mechanism includes a threaded rod 5, and the upper fixed plate 4-1 is provided with a threaded hole. The threaded rod 5 is screwed into the threaded hole, and the lower end of the threaded rod 5 abuts against the upper mold 2. The lower surface of the lower mold 1 contacts the upper surface of the lower fixed plate 4-2.

[0027] Specifically, the threaded rod 5 can be a screw. By rotating the threaded rod 5, the distance between the upper mold 2 and the lower mold 1 can be adjusted. Furthermore, during the rotation of the threaded rod 5, the rotation degree of the threaded rods 5 around the tooling body must be the same to ensure that the distance between the upper mold 2 and the lower mold 1 on all four sides is the same.

[0028] Furthermore, the distance between the upper fixing plate 4-1 and the lower fixing plate 4-2 is greater than the sum of the thicknesses of the upper mold 2 and the lower mold 1.

[0029] Specifically, the distance between the upper fixed plate 4-1 and the lower fixed plate 4-2 must exceed the sum of the thicknesses of the upper mold 2 and the lower mold 1, and this excess distance is an adjustable distance.

[0030] Furthermore, such as Figure 1 As shown, the upper mold 2 has bosses at its four corners and the lower mold 1 has recesses at its four corners, with the bosses and recesses matching each other.

[0031] Specifically, in this utility model, the boss and the concave cooperate with each other, so that the upper mold 2 and the lower mold 1 can fit together perfectly, avoiding misalignment between the two and ensuring the normal use of the tooling.

[0032] Furthermore, handles are provided on the side walls of both the upper mold 2 and the lower mold 1.

[0033] Specifically, the upper mold 2 is opened and closed via a grip, and the grip facilitates the movement of the tooling body.

[0034] Furthermore, one end of the upper fixing plate 4-1 and one end of the lower fixing plate 4-2 are connected by a connecting plate, and the connecting plate 4-3 is provided with a scale.

[0035] Specifically, such as Figure 3 As shown, the distance between the upper and lower molds is determined by the scale on the connecting plate, so as to make it easy to determine the distance between the upper and lower molds.

[0036] After assembly, adjust the distance between the upper mold 1 and the lower mold 2 according to the height of the pad 3 and the scale on the fixture 4 until the flatness of the part is pressed to the required range.

[0037] Furthermore, a pad block 3 is provided between the upper mold 2 and the lower mold 1.

[0038] Specifically, such as Figure 2 , Figure 4 As shown, the pad 3 can be detachably connected to the lower mold 1, or it can be placed directly on the lower mold 1 without connection. The pad 3 has three main functions: 1. The surface of the part is coated with a coating. The thickness of the pad 2 should be slightly higher than that of the part to prevent the coating from being damaged by the upper mold over a large area. The flatness of the part can be within the acceptable range of (padding 2 thickness - part height); 2. The pad can hold thin-walled or flat parts in place, and the pad can also act as a limit, preventing the thin-walled or flat parts from moving during the holding process of the upper and lower molds; 3. By replacing the pad 3 with different thicknesses, the distance between the upper mold 2 and the lower mold 1 can be adjusted until the flatness of the part is pressed to the required range.

[0039] Usage process: Place the part on the lower mold 1, place the pads 3 around the part, cover the part with the upper mold 2, align the boss of the upper mold 2 with the concave of the lower mold 1, place the C-shaped clamp 4 around the tooling body, rotate the threaded rod 5 to adjust the distance between the upper mold 2 and the lower mold 1 until the flatness of the part meets the requirements. The pads 3 of different heights can also be replaced according to different needs to better meet the usage requirements.

[0040] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0041] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A tooling for correcting the flatness of a workpiece after thermal spraying, characterized in that, The tooling body includes an upper mold (2) and a lower mold (1). Both the upper mold (2) and the lower mold (1) are flat plate structures. The part is located between the lower mold (1) and the upper mold (2). The tooling body is provided with several C-shaped clamps (4). Each C-shaped clamp (4) includes an upper fixing plate (4-1) and a lower fixing plate (4-2). The upper fixing plate (4-1) is provided with an adjustment mechanism for adjusting the distance between the upper fixing plate (4-1) and the lower fixing plate (4-2). The tooling body, the C-shaped clamps (4) and the adjustment mechanism work together to achieve the correction of the part.

2. The tooling for correcting the flatness of a workpiece after thermal spraying according to claim 1, characterized in that, The adjustment mechanism includes a threaded rod (5), and the upper fixed plate (4-1) is provided with a threaded hole. The threaded rod is screwed into the threaded hole. The lower end of the threaded rod (5) abuts against the upper mold (2), and the lower surface of the lower mold (1) contacts the upper surface of the lower fixed plate (4-2).

3. The tooling for correcting the flatness of a workpiece after thermal spraying according to claim 1, characterized in that, The distance between the upper fixing plate (4-1) and the lower fixing plate (4-2) is greater than the sum of the thicknesses of the upper mold (2) and the lower mold (1).

4. The tooling for correcting the flatness of a workpiece after thermal spraying according to claim 1, characterized in that, The upper mold (2) has bosses at its four corners and the lower mold (1) has recesses at its four corners, with the bosses and recesses matching each other.

5. The tooling for correcting the flatness of a workpiece after thermal spraying according to claim 1, characterized in that, Handles are provided on the side walls of both the upper mold (2) and the lower mold (1).

6. The tooling for correcting the flatness of a workpiece after thermal spraying according to claim 1, characterized in that, One end of the upper fixing plate (4-1) and one end of the lower fixing plate (4-2) are connected by a connecting plate (4-3), which is provided with a scale.

7. The tooling for correcting the flatness of a workpiece after thermal spraying according to claim 1, characterized in that, A pad (3) is provided between the upper mold (2) and the lower mold (1).

8. The tooling for correcting the flatness of a workpiece after thermal spraying according to claim 1, characterized in that, Let X be the thickness of the part with the coating and H be the thickness of the pad (3). Then (1+0.08)X≥H≥(1+0.05)X.

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