Deformed cylinder type carbon-carbon product correcting tool and method for correcting carbon-carbon product by using same

Abstract

The invention discloses a deformation cylinder type carbon-carbon product correcting tool and a method for correcting a carbon-carbon product through the deformation cylinder type carbon-carbon product correcting tool. The tool comprises a pressing nut, a fixing bolt, a supporting arm, a pressing bolt, a graphite supporting cylinder and two semicircular clamping bases. The two semicircular clamping seats are connected to form a cylinder, a graphite supporting cylinder is arranged in the cylinder, a plurality of square grooves are formed in the semicircular clamping seats, and supporting arms are arranged in the square grooves. The correcting method comprises the steps that the carbon-carbon heat preservation cylinder is placed in the tool, the carbon-carbon heat preservation cylinder makes contact with the graphite supporting cylinder, the carbon-carbon heat preservation cylinder is pressed tightly through the pressing bolt, and high-temperature treatment is conducted. The split type tool is convenient to carry, can be carried to a user site to process a deformed product, and is simple to operate; load can be uniformly applied in the circumferential direction through the semicircular clamping seat, so that secondary damage is prevented; the semicircular clamping seats are spliced through bolts, loads are evenly applied in the same circumferential direction, the parallel clamping seats do not affect each other, and therefore the problem that precise control is difficult is solved.

Description

Technical Field

[0001] The present technical invention belongs to the technical field of photovoltaic / semiconductor thermal fields, and specifically relates to a correction tool for deformed cylindrical carbon-carbon products and a method for correcting carbon-carbon products using the same. Background Art

[0002] In the fields of photovoltaic and semiconductor thermal fields, the thermal insulation cylinder is an essential and important component, which mainly maintains a constant temperature for the thermal field system and reduces heat dissipation. Structurally, the thermal insulation cylinder is made of a carbon cloth mesh preform by needle punching, and then a carbon-carbon product is obtained after chemical vapor deposition or impregnation carbonization. However, during the high-temperature graphitization process, the large-size thermal insulation cylinder has poor radial restraint force and is extremely prone to elliptical deformation. The deformed thermal insulation cylinder is difficult to meet the user's usage requirements, resulting in large losses due to scrapping or modification. Therefore, the price of the thermal insulation cylinder has always been high.

[0003] To solve the above problems, there are currently many conventional correction tools, such as integral ring load propulsion and screw-in push pressing. The integral ring load propulsion is a correction tool designed to extrude the thermal insulation cylinder by 4 sets of fan-shaped surfaces. However, it is difficult to precisely control the propulsion amount of 4 sets or more sets of fan-shaped surfaces, often resulting in secondary damage to the product. The screw-in push pressing is different from the integral ring load propulsion. The former pushes the fan-shaped surface from the inside to the outside, and the propulsion amount can be precisely controlled. However, after the load is removed, the thermal insulation cylinder rebounds, and it is difficult to load the cylindrical tool for graphitization at that time. Summary of the Invention

[0004] In order to solve the problems of the existing correction tools in the prior art, such as the inability to precisely control and the secondary damage to cylindrical carbon-carbon products, the purpose of the present invention is to provide a correction tool for deformed cylindrical carbon-carbon products and a method for correcting carbon-carbon products using the same, which can precisely correct cylindrical carbon-carbon products.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A correction tool for large-size deformed cylindrical carbon-carbon products, comprising a compression nut, a fixing bolt, a support arm, a compression bolt, a graphite support cylinder and two semi-circular chucks;

[0007] Among them, the two semi-circular chucks are connected to form a cylinder for placing the carbon-carbon thermal insulation cylinder. A graphite support cylinder is arranged inside the cylinder. A plurality of square grooves are formed on the semi-circular chucks, and support arms for supporting the carbon-carbon thermal insulation cylinder are arranged in the square grooves.

[0008] Further, the two semi-circular chucks are connected by a compression nut and a compression bolt.

[0009] Further, the upper, middle and lower parts of the two semi-circular chucks are all connected by a compression nut and a compression bolt.

[0010] Furthermore, the semi-circular clamping seat and the support arm are fixed by fixing bolts.

[0011] Furthermore, a number of limiting holes are provided on the support arm.

[0012] A method for straightening carbon-carbon products using a straightening tool for large-sized deformed cylindrical carbon-carbon products includes the following steps:

[0013] Place the carbon-carbon heat preservation cylinder into the tooling, where the carbon-carbon heat preservation cylinder contacts the graphite support cylinder. At room temperature, keep pressing the carbon-carbon heat preservation cylinder through the pressing bolts, place it, and then perform high-temperature treatment to obtain the straightened carbon-carbon heat preservation cylinder.

[0014] Furthermore, the placement time is 2 - 5 days.

[0015] Furthermore, the high-temperature treatment is carried out under argon protection.

[0016] Furthermore, the temperature of the high-temperature treatment is 1700 - 2100 °C, and the time is 1 - 3 hours.

[0017] Furthermore, heat up to 1700 - 2100 °C at a heating rate of 40 - 100 °C / h.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention adopts a combined process of pre-treatment and high-temperature heat treatment using a split-type screw-in semi-circular clamping seat straightening tooling, which can solve the problems existing in traditional straightening, such as large deformation, difficult precision control, and secondary damage. In the present invention, the split-type tooling is convenient to carry and can be carried to the user's site to process deformed products, with simple operation; the semi-circular clamping seat can apply uniform load in the circumferential direction to prevent secondary damage; the semi-circular clamping seats are spliced by bolts, and the load in the same circumferential direction is uniformly applied, and the parallel clamping seats do not affect each other, thus solving the problem of difficult precision control.

[0020] Furthermore, by providing a number of limiting holes on the support arm, the semi-circular clamping seat can move up and down, which can not only meet the straightening of carbon-carbon products in different height directions but also achieve local straightening for the locally deformed area of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a straightening tooling for deformed cylindrical carbon-carbon products;

[0022] Figure 2 It is a front view of a straightening tooling for deformed cylindrical carbon-carbon products;

[0023] Figure 3 It is a top view of a straightening tooling for deformed cylindrical carbon-carbon products;

[0024] Figure 4 Schematic diagram of a semi-circular card seat structure

[0025] Figure 5 Schematic diagram of a support arm structure

[0026] Figure 6 Schematic diagram of a graphite support cylinder structure

[0027] Figure 7 Dimension deviation diagram before and after correction in Example 1

[0028] Wherein: 1 - semi-circular card seat, 2 - compression nut, 3 - limit hole, 4 - fixing bolt, 5 - support arm, 6 - compression bolt, 7 - carbon-carbon heat preservation cylinder, 8 - graphite support cylinder Specific embodiments

[0029] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive

[0030] The large-size deformed cylinder-shaped carbon-carbon products in the present invention are carbon-carbon upper heat preservation cylinders, carbon-carbon middle and lower heat preservation cylinders, carbon-carbon hot pressing die cylinders, etc

[0031] A correction tooling for large-size deformed cylinder-shaped carbon-carbon products in the present invention includes: two semi-circular card seats 1, compression nuts 2, fixing bolts 4, support arms 5, compression bolts 6, carbon-carbon heat preservation cylinders 7 and graphite support cylinders 8. The materials of the semi-circular card seats 1, compression nuts 2, fixing bolts 4, support arms 5, compression bolts 6 and graphite support cylinders 8 are 45# steel or materials with similar or better performance

[0032] Among them, a number of square grooves are provided on the semi-circular card seat 1 for arranging the support arm 5, and the support arm 5 mainly plays a supporting role for the carbon-carbon heat preservation cylinder 7; the semi-circular card seat 1 and the support arm 5 are fixed by the fixing bolt 4

[0033] A number of limit holes are provided on the support arm 5 for adjusting the height of the semi-circular card seat 1 and the carbon-carbon heat preservation cylinder 7 in the vertical direction, and local correction can be carried out according to the specific situation of the product [[ID=3,5]]

[0034] The two semi-circular card seats 1 are connected by the compression bolt 6 to form a cylinder, and the graphite support cylinder 8 is arranged inside the cylinder, and the carbon-carbon heat preservation cylinder 7 is placed between the cylinder and the graphite support cylinder 8. According to the position to be corrected, after the semi-circular card seat 1 is fixed, a uniform load is applied through the compression bolt 6 until the product is corrected

[0035] The method for correcting carbon-carbon products using the above tooling includes the following steps

[0036] (1) Use the above-designed tooling to correct deformed cylindrical carbon-carbon products (such as carbon-carbon heat preservation cylinder 7, upper heat preservation cylinder, middle and lower heat preservation cylinders, furnace inner liner, flow guide cylinder, and crucible side, etc.). To prevent springback, place the carbon-carbon heat preservation cylinder 7 into the tooling and keep it pressed by the pressing bolt 6 at room temperature for 2 days (the pressing degree depends on the inner diameter size of the product being restored to the tolerance range required by the GB / T1804-2000M standard) to fully release the stress.

[0037] (2) Set the graphite support cylinder 8 inside the carbon-carbon heat preservation cylinder 7 and make it contact with the carbon-carbon heat preservation cylinder 7. It is used to prevent the heat preservation cylinder from springing back. Because the correction process will inevitably cause stress concentration in local areas, if the concentrated stress cannot be released, the cylindrical carbon-carbon product will return to its pre-correction state after the tooling is withdrawn. Therefore, using the graphite support cylinder 8 requires further stress release of the product.

[0038] (3) Place the deformed heat preservation cylinder 7 containing the graphite support cylinder 8 into the graphitization furnace, introduce argon for protection, and perform high-temperature treatment at 1700 - 2100 °C for 1 - 3 hours. The heating rate is maintained at 40 - 100 °C / h. After power-off and cooling, samples can be taken to obtain a fully corrected carbon-carbon heat preservation cylinder. Among them, the purpose of the high-temperature treatment is to perform high-temperature graphitization, rearrange the carbon atoms at high temperatures, so that no springback deformation will occur after the tooling is removed. The carbon-carbon composite material starts to graphitize at 1700 °C, and the atoms start to redistribute. The higher the temperature, the higher the graphitization degree, that is, the more regular the arrangement of carbon atoms. Above 2100 °C, the mechanical properties of the carbon-carbon composite material decline severely, so in this invention, the treatment is selected within the range of 1700 - 2100 °C.

[0039] Example 1

[0040] (1) Use the above-designed tooling to correct deformed cylindrical carbon-carbon products (such as carbon-carbon heat preservation cylinder 7, upper heat preservation cylinder, middle and lower heat preservation cylinders, furnace inner liner, flow guide cylinder, and crucible side, etc.). To prevent springback, place the carbon-carbon heat preservation cylinder 7 into the tooling and keep it pressed by the pressing bolt 6 at room temperature for 5 days to fully release the stress.

[0041] (2) Set the graphite support cylinder 8 inside the carbon-carbon heat preservation cylinder 7 and make it contact with the carbon-carbon heat preservation cylinder 7. It is used to prevent the heat preservation cylinder from springing back. Because the correction process will inevitably cause stress concentration in local areas, if the concentrated stress cannot be released, the cylindrical carbon-carbon product will return to its pre-correction state after the tooling is withdrawn. Therefore, using the graphite support cylinder 8 requires further stress release of the product.

[0042] (3) Place the carbon-carbon heat-insulating cylinder containing the graphite support cylinder 8 into the graphitization furnace, introduce argon for protection, and perform high-temperature treatment at 1700 °C for 2 hours, with the heating rate maintained at 40 °C / h. After power-off and cooling, samples can be taken to obtain a fully corrected carbon-carbon heat-insulating cylinder.

[0043] Example 2

[0044] (1) Use the above-designed tooling to correct deformed cylindrical carbon-carbon products (such as carbon-carbon heat-insulating cylinder 7, upper heat-insulating cylinder, middle and lower heat-insulating cylinders, furnace chamber inner liner, flow guide cylinder, and crucible wall, etc.). To prevent springback, place the carbon-carbon heat-insulating cylinder 7 into the tooling and keep it pressed by the pressing bolt 6 at room temperature for 3 days to fully release the stress.

[0045] (2) Place the graphite support cylinder 8 inside the carbon-carbon heat-insulating cylinder 7 and make it in contact with the carbon-carbon heat-insulating cylinder 7. It is used to prevent the heat-insulating cylinder from springing back. Because the correction process will inevitably cause stress concentration in local areas, if the concentrated stress cannot be released, the cylindrical carbon-carbon product will return to its pre-correction state after the tooling is withdrawn. Therefore, using the graphite support cylinder 8 requires further stress release of the product.

[0046] (3) Place the carbon-carbon heat-insulating cylinder containing the graphite support cylinder into the graphitization furnace, introduce argon for protection, and perform high-temperature treatment at 1900 °C for 3 hours, with the heating rate maintained at 80 °C / h. After power-off and cooling, samples can be taken to obtain a fully corrected carbon-carbon heat-insulating cylinder.

[0047] Example 3

[0048] (1) Use the above-designed tooling to correct deformed cylindrical carbon-carbon products (such as carbon-carbon heat-insulating cylinder 7, upper heat-insulating cylinder, middle and lower heat-insulating cylinders, furnace chamber inner liner, flow guide cylinder, and crucible wall, etc.). To prevent springback, place the carbon-carbon heat-insulating cylinder 7 into the tooling and keep it pressed by the pressing bolt 6 at room temperature for 2 days to fully release the stress.

[0049] (2) Place the graphite support cylinder 8 inside the carbon-carbon heat-insulating cylinder 7 and make it in contact with the carbon-carbon heat-insulating cylinder 7. It is used to prevent the heat-insulating cylinder from springing back. Because the correction process will inevitably cause stress concentration in local areas, if the concentrated stress cannot be released, the cylindrical carbon-carbon product will return to its pre-correction state after the tooling is withdrawn. Therefore, using the graphite support cylinder 8 requires further stress release of the product.

[0050] (3) Place the carbon-carbon heat-insulating cylinder containing the graphite support cylinder into the graphitization furnace, introduce argon for protection, and perform high-temperature treatment at 2100 °C for 1 hour, with the heating rate maintained at 100 °C / h. After power-off and cooling, samples can be taken to obtain a fully corrected carbon-carbon heat-insulating cylinder.

[0051] See Figure 7 , the circumferential error before deformation in Example 1 was greater than 8 mm, and the circumferential error before deformation after correction was less than 1.2 mm.

[0052] Since the carbon-carbon heat preservation cylinder is a non-load-bearing part, only the appearance size of the product needs to be considered. The evaluation result of the correction is measured by the deviation after size correction. The smaller the deviation, the more successful the correction, and there is no deformation and springback.

[0053] The above is only an illustration of the best embodiment of the present invention, but it should not be construed as a limitation of the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. Any changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. A correction tooling for large-sized deformed cylindrical carbon-carbon products, characterized in that, It includes a compression nut (2), a fixing bolt (4), a support arm (5), a compression bolt (6), a graphite support cylinder (8) and two semi-circular clamping seats (1); Among them, the two semi-circular clamping seats (1) are connected to form a cylinder for placing a carbon-carbon heat preservation cylinder (7). A graphite support cylinder (8) is arranged inside the cylinder. A number of square grooves are provided on the semi-circular clamping seats (1), and support arms (5) for supporting the carbon-carbon heat preservation cylinder (7) are arranged in the square grooves.

2. The large-size deformed cylinder-shaped carbon-carbon product correction tooling according to claim 1, wherein The two semi-circular clamping seats (1) are connected by a compression nut (2) and a compression bolt (6).

3. The large-size deformed cylinder-shaped carbon-carbon product correction tooling according to claim 1, characterized in that, The upper, middle and lower parts of the two semi-circular clamping seats (1) are all connected by a compression nut (2) and a compression bolt (6).

4. The large-size deformed cylinder-shaped carbon-carbon product correction tooling according to claim 1, wherein, The semi-circular clamping seat (1) and the support arm (5) are fixed by a fixing bolt (4).

5. The large-size deformed cylinder-shaped carbon-carbon product correction tooling according to claim 1, characterized in that A number of limiting holes are provided on the support arm (5).

6. A method for straightening a carbon-carbon product by using the straightening tooling for large-size deformed cylindrical carbon-carbon products according to any one of claims 1-5, characterized in that, It includes the following steps: Put the carbon-carbon heat preservation cylinder (7) into the tooling. The carbon-carbon heat preservation cylinder (7) contacts with the graphite support cylinder (8). At room temperature, keep pressing the carbon-carbon heat preservation cylinder (7) through the compression bolt (6), place it, and then conduct high-temperature treatment to obtain a corrected carbon-carbon heat preservation cylinder.

7. The method for correcting a carbon-carbon product by using a large-size deformed cylinder-shaped carbon-carbon product correcting tooling according to claim 6, characterized in that, The placement time is 2 - 5 days.

8. The method for correcting a carbon-carbon product by using a large-size deformed cylinder-shaped carbon-carbon product correction tooling according to claim 6, characterized in that, The high-temperature treatment is carried out under argon protection.

9. The method for correcting a carbon-carbon product by using the large-size deformed cylinder-shaped carbon-carbon product correction tooling according to claim 6, characterized in that, The temperature of the high-temperature treatment is 1700 - 2100 °C, and the time is 1 - 3 hours.

10. The method for correcting a carbon-carbon product by using the large-size deformed cylinder-shaped carbon-carbon product correcting tooling according to claim 9, characterized in that, Heat up to 1700 - 2100 °C at a heating rate of 40 - 100 °C / h.

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