A preparation tool and preparation method based on inner hole thermal barrier coating

Abstract

The invention discloses a preparation tool for inner hole thermal barrier coating and a preparation method thereof, the preparation tool comprises: a turntable, a turntable, a support, a bracket, a cooling device and an exhaust and dust removal device; the workpiece is coaxially installed in the bracket; two supports are respectively fixed at two ends of the bracket, and the center of each support is processed with a quick-install structure A; the turntable is installed on the turntable; the center of the turntable is processed with a quick-install structure B; one of the supports is coaxially installed on the turntable through the quick-install structure A and the quick-install structure B; the quick-install structure A of the support, the quick-install structure B of the turntable and the center of the turntable are all processed with through holes, the three through holes are connected to form a channel, and the channel is connected to the inner cavity of the workpiece; the exhaust and dust removal device exhausts air from the inner cavity of the workpiece through the channel; the cooling device is located outside the bracket, and cools the workpiece through the bracket; the invention can ensure that the deformation degree of the workpiece is reduced during the inner hole spraying process, meet the coating requirements, reduce the product scrap rate, and increase production efficiency.

Description

Technical Field

[0001] The invention belongs to the field of advanced processing technology of spraying preparation method and deformation control, and specifically relates to a preparation tool based on inner hole thermal barrier coating and a preparation method thereof. Background Art

[0002] Inner hole plasma spraying has difficulties such as the inability to directly observe and the harsh spraying environment. In addition, the thin wall of the product tube during the spraying process is prone to spray deformation, and the small inner hole diameter and long height increase the difficulty of preparing the inner hole coating.

[0003] A product has a small diameter and a height of more than 1 meter. The overall structure is a long cylinder with an expansion joint in the middle. One end of the expansion joint is an inclined surface and the other end is a flat surface, with an angle of 35-50 degrees between the two ends. The spraying part is on the inner wall of the product, and all of them are deep cavity inner hole spraying. The long cylinder structure makes it difficult to discharge the dust and exhaust gas generated during the spraying process in time. The spraying environment is bad, the substrate temperature is difficult to control, and the sprayed product is easy to deform, which further increases the difficulty of coating preparation of the product and causes poor coating quality.

[0004] The position of the middle expansion joint on the product makes it impossible to complete the spraying process in one go. Positioning deviations will occur during multiple spraying processes, resulting in large deviations in coating thickness in subsequent coating preparation, affecting the coating quality.

[0005] Therefore, the quality control of the deep cavity hole coating of this product is the main difficulty in coating preparation and is also the key technology that needs to be broken through. Summary of the invention

[0006] In view of this, the present invention provides a preparation tool and a preparation method based on inner hole thermal barrier coating, which can ensure that the deformation degree of the workpiece is reduced during the inner hole spraying process, meet the coating requirements, reduce the product scrap rate, and increase production efficiency.

[0007] The present invention is achieved through the following technical solutions:

[0008] A preparation tool based on inner hole thermal barrier coating, comprising: a turntable, a turntable, a support, a bracket, a cooling device and an exhaust dust removal device;

[0009] The support is a frame of a cylindrical structure, and the inner wall of the support is provided with a workpiece support structure for supporting a cylindrical workpiece to be coated, and the workpiece is coaxially mounted in the support through the workpiece support structure;

[0010] The two supports are coaxially fixed at the two ends of the bracket, and a quick-install structure A is processed at the center of each support;

[0011] The turntable is mounted on a turntable; a quick-install structure B is processed at the center of the turntable; one of the supports is coaxially mounted on the turntable through the quick-install structure A and the quick-install structure B;

[0012] The quick-install structure A of the support, the quick-install structure B of the turntable and the center of the turntable are all processed with through holes, and the three through holes are connected to form a channel, and the channel is connected to the inner cavity of the workpiece; the exhaust dust removal device exhausts the inner cavity of the workpiece through the channel;

[0013] The cooling device is located outside the support and passes through the support to cool the workpiece.

[0014] Furthermore, the axial length of the bracket is equal to the axial length of the workpiece, and two ends of the workpiece are respectively flush with two ends of the bracket.

[0015] Furthermore, the workpiece supporting structure is a supporting block.

[0016] Furthermore, the quick-install structure A and the quick-install structure B may be connected by thread or by snap-fit.

[0017] Furthermore, the turntable and the turntable are integrally formed by machining.

[0018] A preparation method based on an inner hole thermal barrier coating, based on the preparation tool, the specific steps of the method are as follows:

[0019] Step 1: Install the workpiece in the bracket; let the same end of the bracket and the workpiece be end A, and the other end be end B; install the whole A consisting of the bracket, the bracket and the workpiece on the turntable through the quick-install structure A of the bracket at the end A of the bracket;

[0020] Step 2: The turntable drives the whole B composed of the turntable, the support, the bracket and the workpiece to rotate, and at the same time, the spray gun is inserted into the B end of the workpiece to spray the inner wall of the workpiece by plasma spraying; during the spraying process, the workpiece is cooled by the cooling device, and the dust and exhaust gas generated during the spraying process are discharged from the inner cavity of the workpiece in time by the exhaust dust removal device;

[0021] Step 3, control the position of the spray gun during the spraying process by a program, so that the axial length of the inner wall of the B end of the sprayed workpiece is half of the axial length of the workpiece, close the turntable B, and remove the entire body A from the turntable through the quick-install structure A and the quick-install structure B; then turn the entire body A over 180 degrees, and install the entire body A on the turntable through the quick-install structure A of the support at the B end of the bracket;

[0022] Step 4: driving the whole B to rotate by the turntable, and at the same time, extending the spray gun into the A end of the workpiece, and spraying the inner wall of the workpiece by plasma spraying; during the spraying process, the workpiece is cooled by the cooling device, and the dust and exhaust gas generated during the spraying process are discharged from the inner cavity of the workpiece in time by the exhaust dust removal device;

[0023] Step 5: After the axial length of the inner wall of the workpiece being sprayed is half of the axial length of the workpiece, the spraying of the inner wall of the workpiece is completed.

[0024] Furthermore, two ends of the workpiece are flush with two ends of the bracket respectively.

[0025] Furthermore, the temperature of the workpiece does not exceed 200° C. during inner hole spraying.

[0026] Beneficial effects: (1) The present invention optimizes the preparation tooling and preparation method of plasma spraying thermal barrier coating, adopts a cooling device to assist, controls the deformation of the workpiece during the spraying process, and the temperature of the workpiece during spraying; adopts an exhaust dust removal device to timely discharge the dust and exhaust gas generated in the coating preparation process, ensuring that the coating is free of foreign matter during the preparation process; by flipping the workpiece, it is ensured that the coating transition at the junction of the A end and the B end of the workpiece is uniform and free of abnormal protrusions, thereby solving the problem that restricts the application of thick coating technology in deep cavity holes and meeting the plasma spraying requirements of the inner wall of deep cavity holes; it can effectively ensure the stability of the coating preparation quality of the workpiece during the spraying process, reduce the deformation of the workpiece during the spraying process, thereby improving the coating preparation quality, reducing the time used for coating preparation, greatly shortening the processing cycle of the workpiece, reducing the scrap rate of the workpiece, achieving the effect of increasing production efficiency, and effectively ensuring the production progress.

[0027] (2) The workpiece of the present invention is sprayed at both ends and then connected in the middle. A tooling is prepared as a reference during the spraying process and is guaranteed not to change. The reference is used as the reference surface during the spraying process to compile a spraying program. The position of the spray gun during the spraying process is controlled by the program. The workpiece is flipped using a quick-release structure so that both ends of the workpiece are sprayed and then connected in the middle. This can effectively ensure the positioning coordinates of the product during multiple spraying processes and can ensure that the coating quality at the connection meets the requirements.

[0028] (3) The turntable and the turntable of the present invention can be integrally formed by machining, and can ensure the fixation of the workpiece during use.

[0029] (4) The workpiece of the present invention is installed in the bracket, which can ensure the stability of the workpiece during inner hole spraying.

[0030] (5) The workpiece of the present invention can be quickly replaced through the quick-install structure on the support, and the difficulty of installation during multiple spraying processes is reduced.

[0031] (6) The present invention can control the temperature of the workpiece during the spraying process by cooperating with the cooling device and the hollow bracket, reduce the physical deformation of the workpiece during spraying, ensure that the temperature of the workpiece is within a reasonable range, and provide more accurate protection for subsequent production. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 The three-dimensional Figure 1 ;

[0034] Figure 3 The three-dimensional Figure 2 ;

[0035] Among them, 1-turntable, 2-turntable, 3-support, 4-support raw-workpiece, 6-exhaust dust removal device, 7-cooling device, 8-workpiece supporting structure. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0037] Embodiment 1:

[0038] This embodiment provides a preparation tool for inner hole thermal barrier coating, see the attached Figure 1-3 , including: a turntable 1, a turntable 2, a support 3, a bracket 4, a cooling device 7 and an exhaust dust removal device 6;

[0039] The support 4 is a frame of a cylindrical structure, and the inner wall of the support 4 is provided with a workpiece support structure 8, such as a support block, for supporting a cylindrical workpiece 5 to be coated, and the inner diameter of the support block is the same as the outer diameter of the workpiece 5; the axial length of the support 4 is equal to the axial length of the workpiece 5; the workpiece 5 is coaxially installed in the support 4 through the workpiece support structure 8, and the two ends of the workpiece 5 are respectively flush with the two ends of the support 4;

[0040] The two supports 3 are coaxially fixed at the two ends of the bracket 4, and a quick-install structure A is processed at the center of each support 3;

[0041] The turntable 2 is coaxially mounted on the turntable 1, and the turntable 2 and the turntable 1 are integrated through a mechanical structure; a quick-install structure B is processed at the center of the turntable 2; one of the supports 3 is coaxially mounted on the turntable 2 through the quick-install structure A and the quick-install structure B;

[0042] The quick-install structure A of the support 3, the quick-install structure B of the turntable 2 and the center of the turntable 1 are all processed with through holes, and the three through holes are connected to form a channel, and the channel is connected to the inner cavity of the workpiece 5; the exhaust dust removal device 6 exhausts the inner cavity of the workpiece 5 through the channel to ventilate and remove dust;

[0043] The cooling device 7 is located outside the bracket 4 and passes through the hollow bracket 4 to measure the temperature and cool the outer surface of the workpiece 5;

[0044] The quick-install structure A and the quick-install structure B may be connected by thread or snap connection to achieve quick connection between the two.

[0045] Embodiment 2:

[0046] This embodiment provides a method for preparing an inner hole thermal barrier coating based on the embodiment 1, and the specific steps of the method are as follows:

[0047] Step 1: Install the workpiece 5 in the bracket 4, and make the two ends of the workpiece 5 flush with the two ends of the bracket 4 respectively; one end where the bracket 4 and the workpiece 5 are flush is end A, and the other end is end B; install the whole A consisting of the bracket 3, the bracket 4 and the workpiece 5 on the turntable 2 through the quick-install structure A of the bracket 3 at the end A of the bracket 4;

[0048] Step 2: The turntable 1 drives the whole B composed of the turntable 2, the support 3, the bracket 4 and the workpiece 5 to rotate, and at the same time, the spray gun is inserted into the B end of the workpiece 5, and the inner wall of the workpiece 5 is sprayed by plasma spraying; during the spraying process, the workpiece 5 is temperature-measured and cooled by the cooling device 7 to ensure that the temperature of the workpiece 5 does not exceed 200° C. during the inner hole spraying to prevent the temperature from rising and deforming, and at the same time, the dust and exhaust gas generated during the spraying process are discharged from the inner cavity of the workpiece 5 in time by the exhaust dust removal device 6;

[0049] Step 3: Control the position of the spray gun during the spraying process through a program so that the axial length of the inner wall of the B end of the workpiece 5 to be sprayed is half of the axial length of the workpiece 5, and then the spraying of the inner wall of the B end of the workpiece 5 is completed; then turn the turntable B, and remove the whole A from the turntable 2 through the quick-install structure A and the quick-install structure B; then turn the whole A 180°, and install the whole A on the turntable 2 through the quick-install structure A of the support 3 at the B end of the bracket 4;

[0050] Step 4: The whole B is driven to rotate by the turntable 1, and at the same time, the spray gun is extended into the end A of the workpiece 5, and the inner wall of the workpiece 5 is sprayed by plasma spraying; during the spraying process, the workpiece 5 is temperature-measured and cooled by the cooling device 7 to prevent its temperature from rising and deforming, and at the same time, the dust and exhaust gas generated during the spraying process are discharged from the inner cavity of the workpiece 5 in time by the exhaust dust removal device 6;

[0051] Step 5: After the inner wall of the A end of the workpiece 5 is sprayed, that is, after the axial length of the sprayed inner wall of the workpiece 5 is half of the axial length of the workpiece 5, the spraying of the inner wall of the workpiece 5 is completed.

[0052] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing an inner hole thermal barrier coating, characterized in that: The preparation tooling used in the preparation method comprises: a turntable (1), a turntable (2), a support (3), a bracket (4), a cooling device (7) and an exhaust dust removal device (6); The support (4) is a frame of a cylindrical structure, and the inner wall of the support (4) is provided with a workpiece support structure (8) for supporting a cylindrical workpiece (5) to be coated, and the workpiece (5) is coaxially mounted in the support (4) via the workpiece support structure (8); The two supports (3) are coaxially fixed at the two ends of the bracket (4), and a quick-install structure A is processed at the center of each support (3); The turntable (2) is mounted on the turntable (1); a quick-installation structure B is processed at the center of the turntable (2); one of the supports (3) is coaxially mounted on the turntable (2) via the quick-installation structure A and the quick-installation structure B; The quick-installation structure A of the support (3), the quick-installation structure B of the turntable (2) and the center of the turntable (1) are all processed with through holes, and the three through holes are connected to form a channel, and the channel is connected to the inner cavity of the workpiece (5); the exhaust dust removal device (6) exhausts air from the inner cavity of the workpiece (5) through the channel; The cooling device (7) is located outside the support (4) and passes through the support (4) to cool the workpiece (5); The specific steps of the preparation method are as follows: Step 1: Install the workpiece (5) in the bracket (4); let the same end of the bracket (4) and the workpiece (5) be end A, and the other end be end B; install the whole A consisting of the bracket (3), the bracket (4) and the workpiece (5) on the turntable (2) through the quick-install structure A of the bracket (3) at the end A of the bracket (4); Step 2: The turntable (1) drives the whole B composed of the turntable (2), the support (3), the bracket (4) and the workpiece (5) to rotate, and at the same time, the spray gun is inserted into the B end of the workpiece (5) to spray the inner wall of the workpiece (5) by plasma spraying; during the spraying process, the workpiece (5) is cooled by the cooling device (7), and at the same time, the dust and waste gas generated during the spraying process are discharged from the inner cavity of the workpiece (5) in a timely manner by the exhaust dust removal device (6); Step 3, controlling the position of the spray gun during the spraying process by a program so that the axial length of the inner wall of the B end of the sprayed workpiece (5) is half of the axial length of the workpiece (5), closing the turntable (1), and removing the entire body A from the turntable (2) by means of the quick-installation structure A and the quick-installation structure B; then turning the entire body A over by 180°, and installing the entire body A on the turntable (2) by means of the quick-installation structure A of the support (3) at the B end of the bracket (4); Step 4: The entire body B is driven to rotate by the turntable (1), and at the same time, the spray gun is inserted into the end A of the workpiece (5), and the inner wall of the workpiece (5) is sprayed by plasma spraying; during the spraying process, the workpiece (5) is cooled by the cooling device (7), and at the same time, the dust and waste gas generated during the spraying process are promptly discharged from the inner cavity of the workpiece (5) by the exhaust dust removal device (6); Step 5: After the axial length of the inner wall of the workpiece (5) being sprayed reaches half the axial length of the workpiece (5), the spraying of the inner wall of the workpiece (5) is completed.

2. The method for preparing an inner hole thermal barrier coating according to claim 1, characterized in that: The axial length of the support (4) is equal to the axial length of the workpiece (5), and two ends of the workpiece (5) are respectively flush with two ends of the support (4).

3. The method for preparing an inner hole thermal barrier coating according to claim 1, characterized in that: The workpiece supporting structure (8) is a supporting block.

4. A method for preparing an inner hole thermal barrier coating according to any one of claims 1 to 3, characterized in that: The quick-install structure A and the quick-install structure B can be connected by thread or by snap-fit.

5. A method for preparing an inner hole thermal barrier coating according to any one of claims 1 to 3, characterized in that: The turntable (2) and the turntable (1) are integrally formed by machining.

6. The method for preparing an inner hole thermal barrier coating according to claim 1, characterized in that: The temperature of the workpiece (5) does not exceed 200° C. during inner hole spraying.

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