Tantalum bellows expansion joint forming device and method

Abstract

The present invention discloses a tantalum corrugated expansion joint forming device and method, the tantalum corrugated expansion joint forming device comprises a tool mechanism and a split mold, the split mold outer sleeve is provided with a tantalum liner, a main shaft is provided on a machine tool, the split mold sleeve is provided on the main shaft, the split mold comprises a plurality of tile-shaped mold pieces and fixed flanges installed at both ends of the tile-shaped mold pieces, the outer side wall of the tile-shaped mold piece is provided with a corrugated groove, the depth of the corrugated groove is less than the thickness of the tile-shaped mold piece, both ends of the tile-shaped mold piece are provided with connecting blocks, and the connecting blocks and the fixed flanges are detachably connected; the method comprises the following steps: 1. assembling the split mold and installing the tantalum liner; 2. installing the tool mechanism and the split mold; 3. forming the tantalum corrugated expansion; 4. dismantling the tantalum corrugated expansion joint forming device to obtain the tantalum corrugated expansion joint. The present invention is reasonably designed, and the tantalum corrugated expansion joint can be stably processed and manufactured using a lathe.

Description

Technical Field

[0001] The invention belongs to the technical field of tantalum bellows expansion joint forming, and in particular relates to a tantalum bellows expansion joint forming device and method. Background Art

[0002] Tantalum and tantalum alloys have excellent corrosion resistance. In the chemical industry, tantalum is an ideal corrosion-resistant material, especially in some severe corrosion conditions. Tantalum has corrosion resistance and stability that other metals cannot match. However, due to the high price of tantalum materials, in order to save equipment manufacturing costs, tantalum chemical equipment generally adopts a loose lining structure and only uses thin-walled tantalum materials as the lining layer of the equipment. Since the tantalum lining layer cannot be completely fitted with the base layer and the thermal expansion coefficients are different, large thermal stress is often generated in the tantalum lining layer. This thermal stress may cause the tantalum lining layer or its weld to crack, resulting in leakage failure, which greatly reduces the service life of tantalum loose lining equipment.

[0003] Expansion joints have the function of absorbing external forces and compensating displacements. Therefore, by setting a bellows expansion joint on the tantalum lining layer, the problem of cracking of the tantalum lining weld caused by thermal stress can be eliminated. Tantalum bellows expansion joints can not only effectively compensate for the thermal stress deformation of the tantalum lining layer, but also greatly improve the rigidity of the tantalum lining layer, thereby improving the reliability of such containers and extending the service life of the equipment. However, the molding technology of tantalum bellows expansion joints is not mature at present, and there is no ready-made processing equipment available in China. Therefore, researching a tantalum bellows expansion joint molding device with good molding quality, low production cost, and simple and efficient operation has become a technical problem that urgently needs to be solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tantalum bellows expansion joint forming device in view of the deficiencies in the above-mentioned prior art. The device has a simple structure and a reasonable design. The tantalum bellows expansion joint can be stably processed and manufactured using a lathe. The device is easy to operate, has a low production cost, and is easy to promote and use.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a tantalum bellows expansion joint forming device, characterized in that: it comprises a tool mechanism installed on a machine tool and a split mold installed on the machine tool, the split mold outer shell is provided with a tantalum liner, the machine tool is provided with a main shaft and a tailstock, the main shaft is provided with a four-jaw chuck, the tailstock is provided with a top, one end of the split mold is installed on the four-jaw chuck, the other end of the split mold is provided with a support plate, the side of the support plate close to the split mold is provided with a boss, the boss extends into the other end of the split mold, the outer side surface of the boss is in contact with the inner side surface of the split mold, the side of the support plate close to the split mold is in contact with the other end of the split mold, and the top extends into the center position of the support plate;

[0006] The split mold includes a plurality of tile-shaped mold pieces and fixed flanges installed at both ends of the tile-shaped mold pieces. The cross section formed by the plurality of tile-shaped mold pieces is circular. The outer side wall of the tile-shaped mold piece is provided with a corrugated groove. The number of the corrugated grooves is multiple. The plurality of corrugated grooves are arranged along the length direction of the tile-shaped mold piece, and the depth of the corrugated groove is less than the thickness of the tile-shaped mold piece.

[0007] Both ends of each tile-shaped mold piece are provided with a connecting block, the connecting block and the fixing flange are detachably connected, and the tool mechanism can move toward or away from the split mold direction.

[0008] The above-mentioned tantalum bellows expansion joint forming device is characterized in that: the connecting block is a fan-shaped connecting block, and the outer arc of the fan-shaped connecting block is welded and connected with the inner arc of the tile-shaped mold piece;

[0009] The corrugated grooves are composed of corrugated groove segments arranged on the outer side walls of each tile-shaped mold piece, and each of the corrugated groove segments has the same structure;

[0010] The two adjacent tile-shaped mold pieces are respectively a first tile-shaped mold piece and a second tile-shaped mold piece, the first tile-shaped mold piece is provided with a first tenon groove and a first tenon, the second tile-shaped mold piece is provided with a second tenon groove and a second tenon, the second tenon extends into the first tenon groove, and the first tenon extends into the second tenon groove.

[0011] The above-mentioned tantalum corrugated expansion joint forming device is characterized in that: the tool mechanism includes a tool handle, a tool holder installed at one end of the tool handle and a rotating wheel installed on the tool holder, the tool holder is a U-shaped tool holder, a pin is passed through the tool holder, a bearing is sleeved on the pin, a mounting hole is provided on the tool holder for the pin to pass through, and the rotating wheel is sleeved on the bearing.

[0012] The above-mentioned tantalum corrugated expansion joint forming device is characterized in that a blade is provided on the outer circumferential surface of the rotating wheel, the blade is located at the center of the outer circumferential surface of the rotating wheel, and the outer diameter of the blade is greater than the outer diameter of the rotating wheel by 15mm to 20mm.

[0013] The above-mentioned tantalum corrugated expansion joint forming device is characterized in that: the inner side surface of the corrugated groove is composed of a first arc segment, a first inclined segment, a second arc segment, a second inclined segment and a third arc segment connected in sequence, the first arc segment and the third arc segment are symmetrically arranged about the second arc segment, the first inclined segment and the second inclined segment are symmetrically arranged about the second arc segment, the curvature of the first arc segment and the third arc segment is smaller than the curvature of the second arc segment, the radius of the circle where the first arc segment and the third arc segment are located is smaller than the radius of the circle where the second arc segment is located, and the first arc segment and the third arc segment are both connected to the outer side wall of the tile-shaped mold.

[0014] The above-mentioned tantalum corrugated expansion joint forming device is characterized in that the spacing between two adjacent corrugated grooves is 70mm~100mm, the spacing between the bottom of the corrugated groove and the outer side wall of the tile-shaped mold is 3mm~6mm, and the width of the top of the corrugated groove is 12mm~14mm.

[0015] At the same time, the present invention also discloses a tantalum bellows expansion joint forming method with simple steps, reasonable design, convenient implementation and good use effect, characterized in that the method comprises the following steps:

[0016] Step 1: Assemble the split mold and install the tantalum liner:

[0017] Step 101, splicing a plurality of tile-shaped mold pieces, and installing fixing flanges at both ends of the plurality of tile-shaped mold pieces to obtain a split mold; wherein both ends of the tile-shaped mold pieces are provided with connecting blocks, and bolts are inserted through the connecting blocks and the fixing flanges;

[0018] Step 102, sleeve the tantalum liner on the outer side of the split mold; wherein the inner side of the tantalum liner fits the outer side of the split mold, and the length of the tantalum liner is less than the length of the split mold;

[0019] Step 2: Install the tool mechanism and split mold:

[0020] Step 201, installing a tool holder on the tool handle, and installing a rotary wheel on the tool holder, to complete the assembly of the tool mechanism; wherein a pin is passed through the tool holder, a bearing is sleeved on the pin, the rotary wheel is sleeved on the bearing, and a blade is provided on the outer circumferential surface of the rotary wheel;

[0021] Step 202, installing a tool mechanism on a machine tool, and installing a split mold with a tantalum liner on a spindle of the machine tool;

[0022] Step 3: Forming of Tantalum Corrugated Expansion:

[0023] Step 301, adjusting the tool mechanism to move in a direction close to the split mold, when the tool mechanism fits the outer wall of the tantalum liner outside the split mold; adjusting the tool mechanism to move along the length direction of the split mold until the center of the blade along the thickness direction of the circumferential side coincides with the center projection of the corrugated groove;

[0024] Step 302, the main shaft is operated to rotate, the rotation of the main shaft drives the split mold to rotate, and the rotation of the split mold drives the tantalum liner to rotate; during the rotation of the tantalum liner, the blade radially feeds to contact the tantalum liner, and the blade spins the cylinder wall of the tantalum liner. When the cylinder wall of the tantalum liner spun by the blade contacts the bottom of the corrugated groove, the radial feeding of the blade is stopped, and the processing of a corrugated expansion joint is completed;

[0025] Step 303, the blade is retracted in the radial direction, and the blade is adjusted to move along the length direction of the split mold until the center of the blade along the thickness direction of the circumferential side coincides with the center projection of the next corrugated groove;

[0026] Step 304, repeating step 302 to complete the processing of the next bellows expansion joint;

[0027] Step 305, repeating steps 303 and 304 until the processing of the bellows expansion joints of the tantalum liner at the plurality of bellows grooves is completed;

[0028] Step 4: Dismantling of the Tantalum Bellows Expansion Joint Forming Device:

[0029] Step 401, removing the split mold and the processed tantalum liner from the machine tool;

[0030] Step 402: remove the bolts and the fixing flange, and take out the tile-shaped mold from the processed tantalum liner to obtain a tantalum bellows expansion joint.

[0031] The above method is characterized in that: in step 302, the rotation speed of the main shaft is 30r / min to 50r / min;

[0032] In step 302, the radial feed speed of the blade is 0.4 mm / min to 0.6 mm / min.

[0033] The above method is characterized in that: in step 102, the wall thickness of the tantalum liner is 0.5 mm to 2 mm.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. Simple structure, reasonable design, easy installation and layout, and low investment cost.

[0036] 2. The split mold used includes multiple tile-shaped mold pieces and fixed flanges installed at both ends of the tile-shaped mold pieces. First, it is to reinforce the connection of multiple tile-shaped mold pieces through the fixed flanges, thereby improving the stability of the split mold; second, it is to facilitate the detachable connection between the tile-shaped mold piece and the fixed flange, so that after the tantalum liner is processed, it is easy to disassemble the tile-shaped mold piece and disassemble the tantalum bellows expansion joint, thereby avoiding damage to the inner side surface during the disassembly process of the processed tantalum bellows expansion joint; third, it is to support the tantalum liner, because the wall thickness of the tantalum liner is relatively thin, so as to avoid overall deformation of the tantalum liner; fourth, it is to facilitate the layout of the corrugated grooves.

[0037] 3. The tool mechanism used is designed to be able to move closer to or away from the split mold. The tantalum liner on the split mold is spun by the tool mechanism until the wall of the tantalum liner spun by the tool mechanism contacts the bottom of the corrugated groove, completing the processing of the bellows expansion joint, which is easy to operate.

[0038] 4. The tool mechanism and the split mold are installed on a lathe, so that the tantalum bellows expansion joint can be stably processed and manufactured using the lathe, which is easy to operate and has low production cost.

[0039] 5. The molding method of the tantalum bellows expansion joint adopted has simple steps, convenient implementation and easy operation, ensuring that the molding quality of the tantalum bellows expansion joint meets the requirements.

[0040] 6. The adopted tantalum bellows expansion joint forming method is easy to operate and has good use effect. First, the split mold is assembled and the tantalum liner is installed. Secondly, the tool mechanism and the split mold are installed. Then the main shaft is operated to rotate. The rotation of the main shaft drives the split mold to rotate, and the rotation of the split mold drives the tantalum liner to rotate. During the rotation of the tantalum liner, the blade radially feeds and contacts the tantalum liner, and the blade spins the wall of the tantalum liner. When the wall of the tantalum liner of the blade contacts the bottom of the corrugated groove, the radial feed of the blade is stopped to complete the processing of the bellows expansion joint, realizing the forming of the tantalum bellows expansion joint. The production cost is low and it is easy to promote and use.

[0041] In summary, the present invention has a simple structure and a reasonable design. The tantalum bellows expansion joint can be stably processed and manufactured using a lathe. The operation is convenient, the production cost is low, and the invention is easy to promote and use.

[0042] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic structural diagram of a tantalum bellows expansion joint forming device of the present invention.

[0044] Figure 2 It is a structural schematic diagram of the split mold of the tantalum bellows expansion joint forming device of the present invention.

[0045] Figure 3 for Figure 2 main view.

[0046] Figure 4 It is a structural schematic diagram of the tool mechanism of the tantalum bellows expansion joint forming device of the present invention.

[0047] Figure 5 It is a schematic diagram of the structure of the corrugated groove of the tantalum bellows expansion joint forming device of the present invention.

[0048] Figure 6 The present invention is a flowchart of the method for forming a tantalum bellows expansion joint.

[0049] Description of reference numerals:

[0050] 1—split mold; 1-1—fixed flange; 1-2—connecting block;

[0051] 1-3—tile-shaped mold piece; 1-3-1—first tile-shaped mold piece;

[0052] 1-3-2—second tile-shaped mold piece; 2—tool mechanism; 2-1—rotating wheel;

[0053] 2-2—tool holder; 2-3—pin shaft; 2-4—bearing;

[0054] 2-5—Handle; 2-6—Blade; 3—Spindle;

[0055] 4—machine tool; 5—corrugated groove; 5-1—first arc segment;

[0056] 5-2—first inclination segment; 5-3—second arc segment; 5-4—second inclination segment;

[0057] 5-5—third arc segment; 6—tantalum liner; 7-1—first tenon;

[0058] 7-2—Second tenon; 8—Four-jaw chuck; 9—Tailstock;

[0059] 10—top; 11—support plate; 12—boss;

[0060] 13—Second slide rail. 14—First slide rail. DETAILED DESCRIPTION

[0061] like Figures 1 to 5 A tantalum bellows expansion joint forming device shown in the figure comprises a tool mechanism 2 mounted on a machine tool 4 and a split mold 1 mounted on the machine tool 4, the split mold 1 is provided with a tantalum liner 6 on its outer sleeve, the machine tool 4 is provided with a spindle 3 and a tailstock 9, the spindle 3 is provided with a four-jaw chuck 8, the tailstock 9 is provided with a top 10, one end of the split mold 1 is installed on the four-jaw chuck 8, the other end of the split mold 1 is provided with a support plate 11, a boss 12 is provided on the side of the support plate 11 close to the split mold 1, the boss 12 extends into the other end of the split mold 1, the outer side of the boss 12 is fitted with the inner side of the split mold 1, the side of the support plate 11 close to the split mold 1 is fitted with the other end of the split mold 1, and the top 10 extends into the center position of the support plate 11;

[0062] The split mold 1 includes a plurality of tile-shaped mold pieces 1-3 and fixed flanges 1-1 installed at both ends of the tile-shaped mold pieces 1-3. The cross section formed by the plurality of tile-shaped mold pieces 1-3 is circular. The outer side wall of the tile-shaped mold piece 1-3 is provided with a corrugated groove 5. The number of the corrugated grooves 5 is plural. The plurality of corrugated grooves 5 are arranged along the length direction of the tile-shaped mold piece 1-3, and the depth of the corrugated groove 5 is less than the thickness of the tile-shaped mold piece 1-3.

[0063] Both ends of each of the tile-shaped mold pieces 1 - 3 are provided with connecting blocks 1 - 2 , and the connecting blocks 1 - 2 and the fixing flange 1 - 1 are detachably connected, and the tool mechanism 2 can move toward or away from the split mold 1 .

[0064] In this embodiment, the connecting block 1-2 is a fan-shaped connecting block, and the outer arc of the fan-shaped connecting block 1-2 is welded to the inner arc of the tile-shaped mold piece 1-3;

[0065] The corrugated groove 5 comprises corrugated groove segments arranged on the outer side walls of each tile-shaped mold piece 1-3, and each of the corrugated groove segments has the same structure;

[0066] Two adjacent tile-shaped mold pieces 1-3 are respectively a first tile-shaped mold piece 1-3-1 and a second tile-shaped mold piece 1-3-2. The first tile-shaped mold piece 1-3-1 is provided with a first tenon groove and a first tenon 7-1. The second tile-shaped mold piece 1-3-2 is provided with a second tenon groove and a second tenon 7-2. The second tenon 7-2 extends into the first tenon groove, and the first tenon 7-1 extends into the second tenon groove.

[0067] In this embodiment, the tool mechanism 2 includes a tool handle 2-5, a tool holder 2-2 installed at one end of the tool handle 2-5, and a rotating wheel 2-1 installed on the tool holder 2-2. The tool holder 2-2 is a U-shaped tool holder, a pin shaft 2-3 is passed through the tool holder 2-2, a bearing 2-4 is sleeved on the pin shaft 2-3, a mounting hole is provided on the tool holder 2-2 for the pin shaft 2-3 to pass through, and the rotating wheel 2-1 is sleeved on the bearing 2-4.

[0068] In this embodiment, a blade 2-6 is provided on the outer circumferential surface of the rotating wheel 2-1. The blade 2-6 is located at the center of the outer circumferential surface of the rotating wheel 2-1, and the outer diameter of the blade 2-6 is 15mm to 20mm larger than the outer diameter of the rotating wheel 2-1.

[0069] In this embodiment, the inner side surface of the corrugated groove 5 is composed of a first arc segment 5-1, a first inclination segment 5-2, a second arc segment 5-3, a second inclination segment 5-4 and a third arc segment 5-5 which are connected in sequence. The first arc segment 5-1 and the third arc segment 5-5 are symmetrically arranged about the second arc segment 5-3, the first inclination segment 5-2 and the second inclination segment 5-4 are symmetrically arranged about the second arc segment 5-3, the curvature of the first arc segment 5-1 and the third arc segment 5-5 is smaller than the curvature of the second arc segment 5-3, the radius of the circle where the first arc segment 5-1 and the third arc segment 5-5 are located is smaller than the radius of the circle where the second arc segment 5-3 is located, and the first arc segment 5-1 and the third arc segment 5-5 are both connected to the outer side wall of the tile-shaped mold 1-3.

[0070] In this embodiment, the distance between two adjacent corrugated grooves 5 is 70 mm to 100 mm, the distance between the bottom of the corrugated groove 5 and the outer wall of the tile-shaped mold piece 1-3 is 3 mm to 6 mm, and the width of the top of the corrugated groove 5 is 12 mm to 14 mm.

[0071] In this embodiment, during actual use, the lathe 4 is provided with a first slide rail 14 for the tool mechanism 2 to move along the length direction of the tantalum liner 6, the first slide rail 14 is provided with a first slider, the first slider is provided with a second slide rail 13, the second slider is provided with a second slider, the second slider is provided with a vertical plate for installing the tool handle 2-5 of the tool mechanism 2, the tool mechanism 2 can approach or move away from the tantalum liner 6 along the second slide rail 13, and the first slide rail 14 and the second slide rail 13 are arranged in a cross shape.

[0072] In this embodiment, a positioning hole is provided at the center of the support plate 11 , and the tip 10 extends into the positioning hole, thereby supporting and positioning the support plate 11 .

[0073] In this embodiment, the four-jaw chuck 8, the support plate 11 and the top 10 are positioned so that the position of the tantalum liner 6 does not shift, thereby improving the quality and accuracy of the molding.

[0074] In this embodiment, the radians of the first arc segment 5-1 and the third arc segment 5-5 are in the range of 50° to 60°, and the radian of the second arc segment 5-3 is in the range of 106° to 110°.

[0075] In this embodiment, a first arc segment 5-1 and a third arc segment 5-5 are provided, and the curvature of the first arc segment 5-1 and the third arc segment 5-5 is in the range of 50° to 60°, so as to make a transition connection between the corrugated groove 5 and the outer wall of the tile-shaped mold 1-3, so as to avoid stress concentration on the tantalum liner 6 during the spinning process, thereby avoiding fatigue cracks, notches, holes, and grooves in the corrugated nodes of the tantalum liner 6.

[0076] In the present embodiment, the first inclination section 5-2 and the second inclination section 5-4 are provided in order to increase the depth of the corrugated groove 5 to meet the depth requirement of the tantalum corrugated expansion joint; and in order to increase the width of the corrugated groove 5, thereby facilitating the passage of the blade 2-6 into the third arc section 5-5; the third arc section 5-5 is provided, firstly to cooperate with the circumferential side arc of the blade 2-6, so as to facilitate the blade 2-6 to extend into the third arc section 5-5; and secondly to facilitate the corrugated section formed by the tantalum liner 6 to be arc-shaped, thereby effectively compensating for the thermal stress deformation of the tantalum lining layer, and greatly improving the rigidity of the tantalum lining layer.

[0077] In this embodiment, the split mold 1 includes a plurality of tile-shaped mold pieces 1-3 and fixed flanges 1-1 installed at both ends of the tile-shaped mold pieces 1-3. First, the fixed flanges 1-1 are used to reinforce the connection between the plurality of tile-shaped mold pieces 1-3, thereby improving the stability of the split mold 1; second, the split mold 1 is used to facilitate the detachable connection between the tile-shaped mold piece 1-3 and the fixed flange 1-1, thereby facilitating the removal of the tile-shaped mold piece 1-3 and the tantalum corrugated expansion joint after the tantalum liner 6 is processed, thereby avoiding damage to the inner side surface during the removal of the processed tantalum corrugated expansion joint; third, the split mold 1 is used to support the tantalum liner 6, because the wall thickness of the tantalum liner 6 is relatively thin, thereby avoiding overall deformation of the tantalum liner 6; fourth, the arrangement of the corrugated groove 5 is facilitated.

[0078] In this embodiment, the tool mechanism 2 is provided so as to be able to move towards or away from the split mold 1. The tantalum liner 6 on the split mold 1 is spun by the tool mechanism until the wall of the tantalum liner 6 spun by the tool mechanism contacts the bottom of the corrugated groove 5, thereby completing the processing of the corrugated expansion joint, which is convenient to operate.

[0079] In this embodiment, the tool mechanism and the split mold 1 are installed on a lathe, so that the tantalum bellows expansion joint can be stably processed and manufactured using the lathe, which is easy to operate and has low production cost.

[0080] In this embodiment, the connecting block 1-2 is a fan-shaped connecting block for the following purposes: first, the outer arc of the connecting block 1-2 is welded to the inner arc of the tile-shaped mold 1-3, thereby increasing the connection area between the connecting block 1-2 and the inner side surface of the tile-shaped mold 1-3; and multiple tile-shaped molds 1-3 are fixed by the fixed connection between the connecting block 1-2 and the fixed flange 1-1, thereby improving stability; second, to reduce the outer arc area of ​​the connecting block 1-2, thereby facilitating the processing personnel to reach into the split mold 1 and disassemble multiple tile-shaped molds 1-3.

[0081] In this embodiment, the first tile-shaped mold piece 1-3-1 is provided with a first tenon groove and a first tenon 7-1, and the second tile-shaped mold piece 1-3-2 is provided with a second tenon groove and a second tenon 7-2. The second tenon 7-2 extends into the first tenon groove. The purpose of the first tenon 7-1 extending into the second tenon groove is to achieve the positioning of the first tile-shaped mold piece 1-3-1 and the second tile-shaped mold piece 1-3-2 during installation through the cooperation between the second tenon 7-2 and the first tenon groove and the cooperation between the first tenon 7-1 and the second tenon groove, thereby improving the installation accuracy and thus improving the molding quality of the tantalum corrugated expansion joint.

[0082] In this embodiment, the number of the tile-shaped mold pieces 1 - 3 is four, which is convenient for installation and disassembly and improves the overall stability of the split mold body 1 .

[0083] In this embodiment, a bearing 2-4 is provided, and the rotating wheel 2-1 is sleeved on the bearing 2-4, so that during the rotation of the tantalum liner 6, the rotating wheel 2-1 contacts the tantalum liner 6, and the rotating wheel 2-1 is equivalent to a driven wheel, and also rotates with the tantalum liner 6, so that the rotating wheel 2-1 rotates while being radially fed, and the friction between the rotating wheel 2-1 and the tantalum liner 6 can be reduced by rotating.

[0084] like Figure 6 A method for forming a tantalum bellows expansion joint is shown, comprising the following steps:

[0085] Step 1: Assemble the split mold and install the tantalum liner:

[0086] Step 101, splicing a plurality of tile-shaped mold pieces 1-3, and installing fixing flanges 1-1 at both ends of the plurality of tile-shaped mold pieces 1-3, to obtain a split mold 1; wherein both ends of the tile-shaped mold piece 1-3 are provided with connecting blocks 1-2, and bolts are passed through the connecting blocks 1-2 and the fixing flanges 1-1;

[0087] Step 102, sleeve the tantalum liner 6 onto the outer side of the split mold 1; wherein the inner side of the tantalum liner 6 fits the outer side of the split mold 1, and the length of the tantalum liner 6 is less than the length of the split mold 1;

[0088] Step 2: Install the tool mechanism and split mold:

[0089] Step 201, install the tool holder 2-2 on the tool handle 2-5, and install the rotating wheel 2-1 on the tool holder 2-2, and complete the assembly of the tool mechanism 2; wherein, a pin shaft 2-3 is passed through the tool holder 2-2, a bearing 2-4 is sleeved on the pin shaft 2-3, the rotating wheel 2-1 is sleeved on the bearing 2-4, and a blade 2-6 is provided on the outer circumferential surface of the rotating wheel 2-1;

[0090] Step 202, installing the tool mechanism 2 on the machine tool 4, and installing the split mold 1 equipped with the tantalum liner 6 on the spindle 3 of the machine tool 4;

[0091] Step 3: Forming of Tantalum Corrugated Expansion:

[0092] Step 301, adjust the tool mechanism 2 to move closer to the split mold 1, when the tool mechanism 2 fits the outer wall of the outer tantalum liner 6 of the split mold 1; adjust the tool mechanism 2 to move along the length direction of the split mold 1 until the center of the blade 2-6 along the thickness direction of the circumferential side coincides with the center projection of the corrugated groove 5;

[0093] Step 302, the main shaft 3 is operated to rotate, the rotation of the main shaft 3 drives the split mold 1 to rotate, and the rotation of the split mold 1 drives the tantalum liner 6 to rotate; during the rotation of the tantalum liner 6, the blade 2-6 is radially fed to contact the tantalum liner 6, and the blade 2-6 spins the cylinder wall of the tantalum liner 6. When the cylinder wall of the tantalum liner 6 spun by the blade 2-6 contacts the bottom of the corrugated groove 5, the radial feeding of the blade 2-6 is stopped, and the processing of a corrugated expansion joint is completed;

[0094] Step 303, the blade 2-6 is retracted in the radial direction, and the blade 2-6 is adjusted to move along the length direction of the split mold 1 until the center of the blade 2-6 along the thickness direction of the circumferential side coincides with the center projection of the next corrugated groove 5;

[0095] Step 304, repeating step 302 to complete the processing of the next bellows expansion joint;

[0096] Step 305, repeating steps 303 and 304 until the processing of the bellows expansion joints of the tantalum liner 6 at the plurality of bellows grooves 5 is completed;

[0097] Step 4: Dismantling of the Tantalum Bellows Expansion Joint Forming Device:

[0098] Step 401, removing the split mold 1 and the processed tantalum liner 6 from the machine tool 4;

[0099] Step 402, dismantle the bolts and the fixing flange 1-1, remove the tile-shaped mold 1-3 from the processed tantalum liner 6, and obtain a tantalum bellows expansion joint.

[0100] In this embodiment, the rotation speed of the spindle 3 in step 302 is 30 r / min to 50 r / min;

[0101] In step 302, the radial feed speed of the blade 2-6 is 0.4 mm / min to 0.6 mm / min.

[0102] In this embodiment, the wall thickness of the tantalum liner 6 in step 102 is 0.5 mm to 2 mm.

[0103] In this embodiment, the rotation speed of the main shaft 3 is set to 30r / min~50r / min. This is because if the rotation speed of the main shaft 3 is greater than 50r / min, the friction between the tantalum liner 6 and the part of the blade 2-6 that is spun will be too large, which may easily cause tearing during the expansion joint forming process of the tantalum liner 6; if the rotation speed of the main shaft 3 is less than 30r / min, on the one hand, it affects the expansion joint forming efficiency of the tantalum liner 6; on the other hand, the surface roughness of the expansion joint after forming is also relatively poor.

[0104] In the present embodiment, the radial feed speed of the blade 2-6 is set to 0.4mm / min to 0.6mm / min because if the radial feed speed of the blade 2-6 is less than 0.4mm / min, on the one hand, it affects the expansion joint forming efficiency of the tantalum liner 6; on the other hand, the surface roughness of the expansion joint after forming is also relatively poor; if the radial feed speed of the blade 2-6 is greater than 0.6mm / min, the surface quality of the expansion joint after forming is poor, the power consumption is large, and the blade 2-6 is easy to wear.

[0105] In summary, the present invention has a simple structure and a reasonable design. The tantalum bellows expansion joint can be stably processed and manufactured using a lathe. The operation is convenient, the production cost is low, and the invention is easy to promote and use.

[0106] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A tantalum bellows expansion joint forming device, characterized in that: The invention comprises a tool mechanism (2) mounted on a machine tool (4) and a split mold (1) mounted on the machine tool (4), wherein the outer shell of the split mold (1) is provided with a tantalum liner (6), the machine tool (4) is provided with a main shaft (3) and a tailstock (9), the main shaft (3) is provided with a four-jaw chuck (8), the tailstock (9) is provided with a top (10), one end of the split mold (1) is mounted on the four-jaw chuck (8), the other end of the split mold (1) is provided with a support plate (11), a side surface of the support plate (11) close to the split mold (1) is provided with a boss (12), the boss (12) extends into the other end of the split mold (1), the outer side surface of the boss (12) is in contact with the inner side surface of the split mold (1), the side surface of the support plate (11) close to the split mold (1) is in contact with the other end of the split mold (1), and the top (10) extends into the center position of the support plate (11); The split mold (1) comprises a plurality of tile-shaped mold pieces (1-3) and fixed flanges (1-1) mounted at both ends of the tile-shaped mold pieces (1-3); the cross section formed by the plurality of tile-shaped mold pieces (1-3) is circular; the outer side wall of the tile-shaped mold piece (1-3) is provided with corrugated grooves (5); the number of the corrugated grooves (5) is plural; the plurality of corrugated grooves (5) are arranged along the length direction of the tile-shaped mold piece (1-3); and the depth of the corrugated grooves (5) is less than the thickness of the tile-shaped mold piece (1-3); Both ends of each tile-shaped mold piece (1-3) are provided with a connecting block (1-2), the connecting block (1-2) and the fixing flange (1-1) are detachably connected, and the tool mechanism (2) can move toward or away from the split mold (1); The inner side surface of the corrugated groove (5) is composed of a first arc segment (5-1), a first slope segment (5-2), a second arc segment (5-3), a second slope segment (5-4) and a third arc segment (5-5) which are connected in sequence; the first arc segment (5-1) and the third arc segment (5-5) are symmetrically arranged with respect to the second arc segment (5-3); the first slope segment (5-2) and the second slope segment (5-4) are symmetrically arranged with respect to the second arc segment (5-3); the arcs of the first arc segment (5-1) and the third arc segment (5-5) are smaller than the arc of the second arc segment (5-3); the radius of the circle where the first arc segment (5-1) and the third arc segment (5-5) are located is smaller than the radius of the circle where the second arc segment (5-3) is located; and the first arc segment (5-1) and the third arc segment (5-5) are both connected to the outer side wall of the tile-shaped mold piece (1-3); The expansion joint has the function of absorbing external force and compensating displacement. Therefore, the problem of weld cracking of the tantalum lining layer caused by thermal stress can be eliminated by setting a bellows expansion joint in the tantalum lining layer. The distance between two adjacent corrugated grooves (5) is 70 mm to 100 mm, the distance between the bottom of the corrugated groove (5) and the outer wall of the tile-shaped mold piece (1-3) is 3 mm to 6 mm, and the width of the top of the corrugated groove (5) is 12 mm to 14 mm.

2. A tantalum bellows expansion joint forming device according to claim 1, characterized in that: The connecting block (1-2) is a fan-shaped connecting block, and the outer arc of the fan-shaped connecting block (1-2) is connected to the inner arc of the tile-shaped mold piece (1-3) by welding; The corrugated groove (5) comprises corrugated groove segments arranged on the outer side walls of each tile-shaped mold piece (1-3), and each of the corrugated groove segments has the same structure; Two adjacent tile-shaped mold pieces (1-3) are respectively a first tile-shaped mold piece (1-3-1) and a second tile-shaped mold piece (1-3-2); the first tile-shaped mold piece (1-3-1) is provided with a first tenon groove and a first tenon head (7-1); the second tile-shaped mold piece (1-3-2) is provided with a second tenon groove and a second tenon head (7-2); the second tenon head (7-2) extends into the first tenon groove, and the first tenon head (7-1) extends into the second tenon groove.

3. A tantalum bellows expansion joint forming device according to claim 1, characterized in that: The tool mechanism (2) comprises a tool handle (2-5), a tool holder (2-2) mounted at one end of the tool handle (2-5), and a rotating wheel (2-1) mounted on the tool holder (2-2); the tool holder (2-2) is a U-shaped tool holder; a pin shaft (2-3) is passed through the tool holder (2-2); a bearing (2-4) is sleeved on the pin shaft (2-3); a mounting hole for the pin shaft (2-3) to pass through is provided on the tool holder (2-2); and the rotating wheel (2-1) is sleeved on the bearing (2-4).

4. A tantalum bellows expansion joint forming device according to claim 3, characterized in that: The outer circumferential surface of the rotating wheel (2-1) is provided with a blade portion (2-6), the blade portion (2-6) is located at the center of the outer circumferential surface of the rotating wheel (2-1), and the outer diameter of the blade portion (2-6) is greater than the outer diameter of the rotating wheel (2-1) by 15 mm to 20 mm.

5. A method for forming a tantalum bellows expansion joint, characterized in that: The method comprises the following steps: Step 1: Assemble the split mold and install the tantalum liner: Step 101, splicing a plurality of tile-shaped mold pieces (1-3), and installing fixing flanges (1-1) at both ends of the plurality of tile-shaped mold pieces (1-3), to obtain a split mold (1); wherein both ends of the tile-shaped mold piece (1-3) are provided with connecting blocks (1-2), and bolts are inserted through the connecting blocks (1-2) and the fixing flanges (1-1); Step 102, sleeve the tantalum liner (6) onto the outer side of the split mold (1); wherein the inner side of the tantalum liner (6) fits the outer side of the split mold (1), and the length of the tantalum liner (6) is less than the length of the split mold (1); Step 2: Install the tool mechanism and split mold: Step 201, installing a tool holder (2-2) on a tool handle (2-5), and installing a rotating wheel (2-1) on the tool holder (2-2), thereby completing the assembly of the tool mechanism (2); wherein a pin shaft (2-3) is inserted through the tool holder (2-2), a bearing (2-4) is sleeved on the pin shaft (2-3), the rotating wheel (2-1) is sleeved on the bearing (2-4), and a blade portion (2-6) is provided on the outer circumferential surface of the rotating wheel (2-1); Step 202, installing a tool mechanism (2) on a machine tool (4), and installing a split mold (1) equipped with a tantalum liner (6) on a spindle (3) of the machine tool (4); Step 3: Forming of Tantalum Corrugated Expansion: Step 301, adjusting the tool mechanism (2) to move in a direction close to the split mold (1), when the tool mechanism (2) fits the outer wall of the tantalum liner (6) outside the split mold (1); adjusting the tool mechanism (2) to move along the length direction of the split mold (1) until the center of the blade (2-6) along the thickness direction of the circumferential side coincides with the center projection of the corrugated groove (5); Step 302, the main shaft (3) is operated to rotate, the rotation of the main shaft (3) drives the split mold (1) to rotate, and the rotation of the split mold (1) drives the tantalum liner (6) to rotate; during the rotation of the tantalum liner (6), the blade (2-6) radially feeds to contact the tantalum liner (6), and the blade (2-6) spins the cylinder wall of the tantalum liner (6). When the blade (2-6) spins the cylinder wall of the tantalum liner (6) and contacts the bottom of the corrugated groove (5), the radial feeding of the blade (2-6) is stopped, and the processing of a corrugated expansion joint is completed; Step 303, the blade (2-6) is retracted in the radial direction, and the blade (2-6) is adjusted to move along the length direction of the split mold (1) until the center of the blade (2-6) along the thickness direction of the circumferential side coincides with the center projection of the next corrugated groove (5); Step 304, repeating step 302 to complete the processing of the next bellows expansion joint; Step 305, repeating steps 303 and 304 until the processing of the bellows expansion joints at the plurality of bellows grooves (5) of the tantalum liner (6) is completed; Step 4: Dismantling of the Tantalum Bellows Expansion Joint Forming Device: Step 401, removing the split mold (1) and the processed tantalum liner (6) from the machine tool (4); Step 402: remove the bolts and the fixing flange (1-1), and take out the tile-shaped mold piece (1-3) from the processed tantalum liner (6) to obtain a tantalum bellows expansion joint.

6. A method for forming a tantalum bellows expansion joint according to claim 5, characterized in that: In step 302, the rotation speed of the spindle (3) is 30 r / min to 50 r / min; In step 302 , the radial feed speed of the blade portion ( 2 - 6 ) is 0.4 mm / min to 0.6 mm / min.

7. A method for forming a tantalum bellows expansion joint according to claim 5, characterized in that: In step 102, the wall thickness of the tantalum liner (6) is 0.5 mm to 2 mm.

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