Novel porcelain elbow embryo processing equipment and processing technology

Abstract

This invention discloses a novel ceramic bent tube blank processing equipment and process. The key technical points are: a fixed base with a worktable for placing the ceramic bent tube blank on its upper surface; a servo cylinder fixedly mounted on the inner upper surface of the worktable; a mounting plate fixedly mounted at the output end of the servo cylinder; a first servo motor fixedly mounted on the upper surface of the mounting plate; a connecting frame welded to one lower surface of the mounting plate; a bearing seat fixedly mounted at the other end of the connecting frame; and a rotating tool holder rotatably mounted on the inner side of the bearing seat via a bearing. This invention, by using a servo cylinder, can drive the mounting plate to rise and fall, which in turn drives the first servo motor, transmission components, and rotating tool holder to rise and fall, thereby changing the position of the rotating tool holder. This facilitates the passage of ceramic bent tube blanks of different diameters through the rotating tool holder, thus enabling the processing of ceramic bent tube blanks of different diameters.

Description

Technical Field

[0001] This invention relates to the field of ceramic bent tube blank processing, and in particular to a novel ceramic bent tube blank processing equipment and processing technology. Background Technology

[0002] Pipeline transportation is widely used in various industries, such as construction, petroleum, mining, and coal. Bends are an essential component of pipeline transportation systems. Bends are generally classified as single-layer bends and double-layer bends, and their materials typically include cast iron, ceramics, alloy steel, carbon steel, non-ferrous metals, and plastics.

[0003] Current ceramic tube bending processing equipment still has some problems: it is inconvenient to process ceramic tubes of different diameters on a single processing machine, and it is inconvenient to fix ceramic tubes of different lengths. In addition, ceramic forming processes include injection molding and extrusion. The first injection molding scheme and the second extrusion molding require equipment and molds. The equipment and molds for tubes with an R1000mm or more are very large. Moreover, injection molding and extrusion processes are difficult to achieve the hardness requirements of wear-resistant ceramics, resulting in high equipment costs and production difficulties. Therefore, a new type of ceramic tube bending preform processing equipment and processing technology has been designed. Summary of the Invention

[0004] In view of the problems mentioned in the background art, the purpose of this invention is to provide a new type of ceramic bending tube blank processing equipment and processing technology to solve the problems mentioned in the background art.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A novel ceramic tube bending blank processing equipment includes a fixed base. A worktable for placing the ceramic tube bending blank is provided on the upper surface of the fixed base. A servo cylinder is fixedly installed on the inner upper surface of the worktable. A mounting plate is fixedly installed at the output end of the servo cylinder. A first servo motor is fixedly installed on the upper surface of the mounting plate. A connecting frame is welded to the lower surface of one side of the mounting plate. A bearing seat is fixedly installed at the other end of the connecting frame. A rotating tool holder is rotatably mounted on the inner side of the bearing seat via a bearing. One end of the rotating tool holder is connected to the output end of the first servo motor via a transmission assembly. Cutting tools are symmetrically arranged on the outer surface of the other end of the rotating tool holder. The cutting tools are connected to the rotating tool holder via an adjustment assembly.

[0007] A groove is provided in the middle of the upper surface of the workbench. A horizontal plate is fixedly installed inside the groove. A positioning cylinder is rotatably connected to the upper surface of one end of the horizontal plate. A first clamping plate for fixing one end of the ceramic bent tube blank is welded to the outer surface of the positioning cylinder. An installation groove is provided on the upper surface of the positioning cylinder. A second servo motor is fixedly installed in the installation groove. A fixing block is fixedly connected to the output end of the second servo motor. A second clamping plate for fixing the other end of the ceramic bent tube blank is welded to the fixing block.

[0008] By adopting the above technical solution, a servo cylinder can drive the mounting plate to rise and fall. The mounting plate can drive the first servo motor, transmission components, and rotating tool holder to rise and fall, thereby changing the position of the rotating tool holder. This facilitates the passage of ceramic bent tube blanks of different diameters through the rotating tool holder, thus making it easier to process ceramic bent tube blanks of different diameters. The adjustable components can adjust the distance between the upper and lower sets of tools, thus meeting the cutting requirements of ceramic bent tube blanks of different diameters. By setting a first clamping plate and a second clamping plate, the second servo motor drives the second clamping plate to rotate, allowing the second clamping plate to rotate with the length of the ceramic bent tube blank and cooperate with the first clamping plate to clamp and fix the ceramic bent tube blank, thus facilitating the clamping and fixing of ceramic bent tube blanks of different lengths.

[0009] Preferably, one side of the upper surface of the worktable is provided with a smooth structure, and the other end of the upper surface of the worktable is provided with a hollow structure.

[0010] Preferably, the transmission assembly includes a first transmission wheel, a second transmission wheel, and a belt. The first transmission wheel is driven to the output end of the first servo motor, and the second transmission wheel is fixedly sleeved on one end of the rotating tool holder. The first transmission wheel and the second transmission wheel are connected by the belt.

[0011] Preferably, the adjustment assembly includes two sets of adjustment seats, a rotating block, two sets of adjustment screws, an adjustment block, and a connecting rod. The two sets of adjustment seats are respectively fixedly disposed on the outer surface of the rotating tool holder, the two sets of adjustment screws are respectively rotatably disposed on the two sets of adjustment seats, the rotating block is welded between the two sets of adjustment screws, the adjustment block is threadedly connected to the adjustment screw, and the two ends of the connecting rod are fixedly disposed between the tool and the adjustment block.

[0012] Preferably, both sets of adjusting seats are threaded with tightening bolts, and the bottom end of the tightening bolts is in contact with the surface of the adjusting screw.

[0013] Preferably, a T-shaped limiting block is fixedly provided on the inner side of the cutting tool, and a T-shaped limiting groove is provided on the outer side of the rotating tool holder, with the T-shaped limiting block slidably disposed in the T-shaped limiting groove.

[0014] Preferably, the threads of the two sets of adjusting screws are in opposite directions.

[0015] Preferably, a first clamping block is welded to the end of the first clamping plate, and a second clamping block is welded to the end of the second clamping plate, and the first clamping plate and the second clamping plate are arranged in an upper and lower structure.

[0016] Preferably, the processing equipment further includes a steel core mold, a rubber sleeve mold, and a sintering and shaping mold, wherein the rubber sleeve mold is fitted onto the circumference of the steel core mold.

[0017] A novel ceramic bent tube blank processing technology includes the following steps:

[0018] S1. Blank Pressing: The bending radius of the integral bent pipe is determined according to customer requirements. The blank pressing adopts isostatic pressing to make a hollow blank. During the blank pressing process, the alumina powder used to make ceramic pipes is first evenly filled into the cavity between the steel core mold and the rubber sleeve mold. Then, the ends of the rubber sleeve mold and the steel core mold are sealed and placed in the isostatic press for pressure. The plastic deformation of the rubber is used to press the powder into a ceramic pipe blank. After the pressure is completed, the mold is removed, and then the outer rubber sleeve mold is removed to complete the blank pressing. If the outer surface does not meet the requirements of ceramic pipes during isostatic pressing, a certain machining allowance is reserved for the outer diameter during the blank pressing process.

[0019] S2. Turning the outer diameter: The ceramic bent tube blank is passed through the middle position of the rotating tool holder. The two ends of the ceramic bent tube blank are clamped and fixed by the first clamping plate and the second clamping plate. The position of the tool is adjusted by the adjustment component. The rotating tool is driven to rotate by the first servo motor and the transmission component, so that the tool can cut the surface of the ceramic bent tube blank. At the same time, by rotating the first clamping plate and the second clamping plate, the ceramic bent tube blank is rotated from the left worktable to the right worktable to complete the processing.

[0020] S3. Sintering: During sintering, the ceramic tube blank is placed on the sintering and shaping mold with both ends of the tube facing down. During sintering, the inner bend of the ceramic tube fits into the sintering and shaping mold to ensure that the radius of the ceramic tube after sintering is consistent with the curvature of the sintering and shaping mold, thus obtaining a ceramic tube blank with the same radius as the original design of the product. Due to gravity, the ceramic tube will be elongated at both ends. After sintering, the elongated part is cut off.

[0021] In summary, the present invention has the following main beneficial effects:

[0022] First, by setting a servo electric cylinder, the mounting plate can be raised and lowered. The mounting plate can drive the first servo motor, transmission components and rotating tool holder to be raised and lowered, thereby changing the position of the rotating tool holder, so that ceramic bent tube blanks of different diameters can pass through the rotating tool holder, thus facilitating the processing of ceramic bent tube blanks of different diameters.

[0023] Secondly, the distance between the upper and lower sets of cutters can be adjusted by the set adjustment components, so as to meet the cutting process of ceramic bent tube blanks of different diameters;

[0024] Third, by setting a first clamping plate and a second clamping plate, the second clamping plate is driven to rotate by a second servo motor, so that the second clamping plate can rotate with the length of the ceramic bent tube blank and cooperate with the first clamping plate to clamp and fix the ceramic bent tube blank, thereby facilitating the clamping and fixing of ceramic bent tube blanks of different lengths.

[0025] Fourth, compared with injection molding and extrusion processes, the production process of the ceramic bent pipe blank of the present invention does not require investment in large injection molding machines and other production equipment. The mold is very simple, and the mold manufacturing cost is low. The hardness of the produced ceramic pipe is also higher than that of other processes. It can provide a reliable integral bent ceramic pipe product for pipeline transportation industries such as chemical and new energy that require protection against material contamination and wear resistance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is the present invention. Figure 1 Top view of the structure;

[0028] Figure 3 yes Figure 2 Enlarged view of point A in the image;

[0029] Figure 4 This is the present invention. Figure 1 A schematic diagram of the structure excluding the first and second clamping plates;

[0030] Figure 5 yes Figure 4 Right view of the rotating tool holder section.

[0031] Reference numerals: 1. Fixed base; 2. Ceramic bent tube blank; 3. Worktable; 4. Servo cylinder; 5. Mounting plate; 6. First servo motor; 7. Connecting frame; 8. Bearing seat; 9. Rotary tool holder; 10. Transmission assembly; 101. First transmission wheel; 102. Second transmission wheel; 103. Belt; 11. Tool; 12. Adjustment assembly; 121. Adjustment seat; 122. Rotating block; 123. Adjustment screw; 124. Adjustment block; 125. Connecting rod; 126. Tightening bolt; 13. Groove; 14. Horizontal plate; 15. Positioning cylinder; 16. First clamping plate; 17. Mounting groove; 18. Second servo motor; 19. Fixed block; 20. Second clamping plate; 21. First clamping block; 22. Second clamping block. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0033] refer to Figure 1-5 A novel ceramic tube bending blank processing equipment includes a fixed base 1. The upper surface of the fixed base 1 is provided with a worktable 3 for placing a ceramic tube bending blank 2. A servo electric cylinder 4 is fixedly installed on the inner upper surface of the worktable 3. An installation plate 5 is fixedly installed at the output end of the servo electric cylinder 4. A first servo motor 6 is fixedly installed on the upper surface of the installation plate 5. A connecting frame 7 is welded to one lower surface of the installation plate 5. A bearing seat 8 is fixedly installed at the other end of the connecting frame 7. A rotating tool holder 9 is rotatably arranged on the inner side of the bearing seat 8 through a bearing. One end of the rotating tool holder 9 is connected to the output end of the first servo motor 6 through a transmission assembly 10. Cutting tools 11 are symmetrically arranged on the outer surface of the other end of the rotating tool holder 9. The cutting tools 11 are connected to the rotating tool holder 9 through an adjustment assembly 12.

[0034] A groove 13 is provided in the middle of the upper surface of the workbench 3. A horizontal plate 14 is fixedly installed inside the groove 13. A positioning cylinder 15 is rotatably connected to the upper surface of one end of the horizontal plate 14. A first clamping plate 16 for fixing one end of the ceramic bent tube blank 2 is welded to the outer surface of the positioning cylinder 15. An installation groove 17 is provided on the upper surface of the positioning cylinder 15. A second servo motor 18 is fixedly installed in the installation groove 17. A fixing block 19 is fixedly connected to the output end of the second servo motor 18. A second clamping plate 20 for fixing the other end of the ceramic bent tube blank 2 is welded to the fixing block 19.

[0035] refer to Figure 2 In order to reduce friction with the workpiece and facilitate the feeding of the workpiece, one side of the upper surface of the worktable 3 is set with a smooth structure, and the other end of the upper surface of the worktable 3 is set with a hollow structure.

[0036] refer to Figure 2-3 To facilitate the transmission between the first servo motor 6 and the rotating tool holder 9, the transmission assembly 10 includes a first transmission wheel 101, a second transmission wheel 102, and a belt 103. The first transmission wheel 101 is connected to the output end of the first servo motor 6, and the second transmission wheel 102 is fixedly sleeved on one end of the rotating tool holder 9. The first transmission wheel 101 and the second transmission wheel 102 are connected by the belt 103.

[0037] refer to Figure 5 The adjustment assembly 12 includes two sets of adjustment seats 121, a rotating block 122, two sets of adjustment screws 123, an adjustment block 124, and a connecting rod 125. The two sets of adjustment seats 121 are respectively fixedly disposed on the outer surface of the rotating tool holder 9. The two sets of adjustment screws 123 are respectively rotatably disposed on the two sets of adjustment seats 121. The rotating block 122 is welded between the two sets of adjustment screws 123. The adjustment block 124 is threadedly connected to the adjustment screw 123. The two ends of the connecting rod 125 are fixedly disposed between the tool 11 and the adjustment block 124. By rotating the rotating block 122, the adjustment screw 123 is driven to rotate. The rotation of the adjustment screw 123 causes the adjustment block 124 to move on the adjustment screw 123. The connecting rod 125 drives the tool 11 to move, thereby adjusting the distance between the upper and lower sides of the tool 11, which is convenient for processing ceramic bent tube blanks 2 of different diameters.

[0038] refer to Figure 5 In order to facilitate the fixing of the adjusting screw 123 and increase the stability of the adjusting screw 123 when it does not need to be rotated, both sets of adjusting seats 121 are threaded with tightening bolts 126, and the bottom end of the tightening bolts 126 is in contact with the surface of the adjusting screw 123.

[0039] refer to Figure 5 In order to increase the stability of the cutting tool 11 during movement and to prevent the cutting tool 11 from falling off the rotating tool holder 9, a T-shaped limiting block is fixedly provided on the inner side of the cutting tool 11, and a T-shaped limiting groove is provided on the outer side of the rotating tool holder 9, and the T-shaped limiting block is slidably disposed in the T-shaped limiting groove.

[0040] refer to Figure 5 To facilitate the synchronous movement of the two sets of tool holders in opposite directions, the threads of the two sets of adjusting screws 123 are in opposite directions.

[0041] refer to Figure 1-2 In order to facilitate clamping and fixing both ends of the ceramic bent tube blank 2, a first clamping block 21 is welded to the end of the first clamping plate 16, and a second clamping block 22 is welded to the end of the second clamping plate 20. The first clamping plate 16 and the second clamping plate 20 are arranged in an upper and lower structure.

[0042] To facilitate the pressing and sintering of the ceramic bent tube blank 2, the processing equipment also includes a steel core mold, a rubber sleeve mold, and a sintering and shaping mold, wherein the rubber sleeve mold is fitted onto the circumference of the steel core mold.

[0043] A novel ceramic bent tube blank processing technology includes the following steps:

[0044] S1. Blank Pressing: The bending radius of the integral bent pipe is determined according to customer requirements. The blank pressing adopts isostatic pressing to make a hollow blank. During the blank pressing process, the alumina powder used to make ceramic pipes is first evenly filled into the cavity between the steel core mold and the rubber sleeve mold. Then, the ends of the rubber sleeve mold and the steel core mold are sealed and placed in the isostatic press for pressure. The plastic deformation of the rubber is used to press the powder into a ceramic pipe blank. After the pressure is completed, the mold is removed, and then the outer rubber sleeve mold is removed to complete the blank pressing. If the outer surface does not meet the requirements of ceramic pipes during isostatic pressing, a certain machining allowance is reserved for the outer diameter during the blank pressing process.

[0045] S2. Turning the outer circle: The ceramic bent tube blank 2 is passed through the middle position of the rotating tool holder 9. The two ends of the ceramic bent tube blank 2 are clamped and fixed by the first clamping plate 16 and the second clamping plate 20. The position of the tool 11 is adjusted by the adjusting component 12. The rotating tool 11 is driven to rotate by the first servo motor 6 and the transmission component 10, so that the tool 11 can cut the surface of the ceramic bent tube blank 2. At the same time, by rotating the first clamping plate 16 and the second clamping plate 20, the ceramic bent tube blank 2 is rotated from the left worktable 3 to the right worktable 3 to complete the processing.

[0046] S3. Sintering: During sintering, the ceramic tube blank 2 is placed on the sintering and shaping mold with both ends of the tube facing down. During sintering, the inner bend of the ceramic tube fits into the sintering and shaping mold to ensure that the bending radius of the ceramic tube after sintering is consistent with the curvature of the sintering and shaping mold, thus obtaining the ceramic tube blank 2 with the same radius as the original design of the product. Due to gravity, the ceramic tube will be elongated at both ends. After sintering, the elongated part is cut off.

[0047] Operating principle and advantages:

[0048] First, by setting the servo electric cylinder 4, the mounting plate 5 can be driven to rise and fall. The mounting plate 5 can drive the first servo motor 6, the transmission component 10 and the rotating tool holder 9 to rise and fall, thereby changing the position of the rotating tool holder 9, so that ceramic bent tube blanks 2 of different diameters can pass through the rotating tool holder 9, thus facilitating the processing of ceramic bent tube blanks 2 of different diameters.

[0049] Second, the distance between the upper and lower sets of cutters 11 can be adjusted by the adjustment component 12, so as to meet the cutting process of ceramic bent tube blanks 2 with different diameters.

[0050] Third, by setting the first clamping plate 16 and the second clamping plate 20, the second servo motor 18 drives the second clamping plate 20 to rotate, so that the second clamping plate 20 can rotate with the length of the ceramic bent tube blank 2, and cooperate with the first clamping plate 16 to clamp and fix the ceramic bent tube blank 2, thereby facilitating the clamping and fixing of ceramic bent tube blanks 2 of different lengths.

[0051] Fourth, the production process of the ceramic bent pipe blank 2 of the present invention does not require investment in large injection molding machines and other production equipment compared with injection molding and extrusion processes. The mold is very simple, and the mold manufacturing cost is low. The hardness of the produced ceramic pipe is also higher than that of other processes. It can provide a reliable integral bent ceramic pipe product for pipeline transportation industries such as chemical and new energy that require protection against material contamination and wear resistance.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel ceramic tube bending blank processing equipment, characterized in that: The device includes a fixed base (1), on the upper surface of which is provided a worktable (3) for placing a ceramic bent tube blank (2). A servo electric cylinder (4) is fixedly installed on the inner upper surface of the worktable (3). An installation plate (5) is fixedly installed at the output end of the servo electric cylinder (4). A first servo motor (6) is fixedly installed on the upper surface of the installation plate (5). A connecting frame (7) is welded to one lower surface of the installation plate (5). A bearing seat (8) is fixedly installed at the other end of the connecting frame (7). A rotating tool holder (9) is rotatably provided on the inner side of the bearing seat (8) through a bearing. One end of the rotating tool holder (9) is connected to the output end of the first servo motor (6) through a transmission component (10). A cutting tool (11) is symmetrically arranged on the outer surface of the other end of the rotating tool holder (9). The cutting tool (11) is connected to the rotating tool holder (9) through an adjustment component (12). A groove (13) is provided in the middle of the upper surface of the workbench (3). A horizontal plate (14) is fixedly installed inside the groove (13). A positioning cylinder (15) is rotatably connected to the upper surface of one end of the horizontal plate (14). A first clamping plate (16) for fixing one end of the ceramic bent tube blank (2) is welded to the outer surface of the positioning cylinder (15). An installation groove (17) is provided on the upper surface of the positioning cylinder (15). A second servo motor (18) is fixedly installed in the installation groove (17). A fixing block (19) is fixedly connected to the output end of the second servo motor (18). A second clamping plate (20) for fixing the other end of the ceramic bent tube blank (2) is welded to the fixing block (19).

2. The novel ceramic tube bending blank processing equipment according to claim 1, characterized in that: The upper surface of the workbench (3) is set with a smooth surface on one side and a hollowed-out structure on the other side.

3. The novel ceramic tube bending blank processing equipment according to claim 1, characterized in that: The transmission assembly (10) includes a first transmission wheel (101), a second transmission wheel (102), and a belt (103). The first transmission wheel (101) is connected to the output end of the first servo motor (6), and the second transmission wheel (102) is fixedly sleeved on one end of the rotating tool holder (9). The first transmission wheel (101) and the second transmission wheel (102) are connected by the belt (103).

4. The novel ceramic tube bending blank processing equipment according to claim 1, characterized in that: The adjustment assembly (12) includes two sets of adjustment seats (121), a rotating block (122), two sets of adjustment screws (123), an adjustment block (124), and a connecting rod (125). The two sets of adjustment seats (121) are respectively fixedly installed on the outer surface of the rotating tool holder (9). The two sets of adjustment screws (123) are respectively rotatably installed on the two sets of adjustment seats (121). The rotating block (122) is welded between the two sets of adjustment screws (123). The adjustment block (124) is threadedly connected to the adjustment screw (123). The two ends of the connecting rod (125) are fixedly installed between the tool (11) and the adjustment block (124).

5. The novel ceramic tube bending blank processing equipment according to claim 4, characterized in that: Both sets of the adjusting seats (121) are threaded with tightening bolts (126), and the bottom end of the tightening bolts (126) is in contact with the surface of the adjusting screw (123).

6. The novel ceramic tube bending blank processing equipment according to claim 4, characterized in that: A T-shaped limiting block is fixedly provided on the inner side of the cutting tool (11), and a T-shaped limiting groove is provided on the outer side of the rotating tool holder (9). The T-shaped limiting block is slidably disposed in the T-shaped limiting groove.

7. The novel ceramic tube bending blank processing equipment according to claim 4, characterized in that: The two sets of adjusting screws (123) have opposite thread directions.

8. The novel ceramic tube bending blank processing equipment according to claim 1, characterized in that: The first clamping plate (16) is welded with a first clamping block (21) at its end, and the second clamping plate (20) is welded with a second clamping block (22) at its end. The first clamping plate (16) and the second clamping plate (20) are arranged in an upper and lower structure.

9. The novel ceramic tube bending blank processing equipment according to claim 1, characterized in that: The processing equipment also includes a steel core mold, a rubber sleeve mold, and a sintering and shaping mold, wherein the rubber sleeve mold is fitted onto the circumference of the steel core mold.

10. A novel ceramic bent tube blank processing technology, characterized in that: Includes the following steps: S1. Blank Pressing: The bending radius of the integral bent pipe is determined according to customer requirements. The blank pressing adopts isostatic pressing to make a hollow blank. During the blank pressing process, the alumina powder used to make ceramic pipes is first evenly filled into the cavity between the steel core mold and the rubber sleeve mold. Then, the ends of the rubber sleeve mold and the steel core mold are sealed and placed in the isostatic press for pressure. The plastic deformation of the rubber is used to press the powder into a ceramic pipe blank. After the pressure is completed, the mold is removed, and then the outer rubber sleeve mold is removed to complete the blank pressing. If the outer surface does not meet the requirements of ceramic pipes during isostatic pressing, a certain machining allowance is reserved for the outer diameter during the blank pressing process. S2. Turning the outer circle: Pass the ceramic bent tube blank (2) through the middle position of the rotating tool holder (9), and clamp and fix the two ends of the ceramic bent tube blank (2) by the first clamping plate (16) and the second clamping plate (20). Adjust the position of the tool (11) by the adjusting component (12), and drive the rotating tool (11) to rotate by the first servo motor (6) and the transmission component (10), so that the tool (11) can cut the surface of the ceramic bent tube blank (2). At the same time, by rotating the first clamping plate (16) and the second clamping plate (20), the ceramic bent tube blank (2) is rotated from the left worktable (3) to the right worktable (3) to complete the processing. S3. Sintering: During sintering, the ceramic tube blank (2) is placed on the sintering mold with both ends of the tube facing down. During sintering, the inner bend of the ceramic tube fits into the sintering mold to ensure that the radius of the ceramic tube after sintering is consistent with the arc of the sintering mold, so as to obtain the ceramic tube blank (2) with the same radius as the original design of the product. Due to gravity, the ceramic tube will be stretched at both ends. After sintering, the elongated part will be cut off.

Images