Tantalum lining plate integral punching and flanging forming device

Abstract

The utility model relates to the field of chemical equipment manufacturing, in particular to the field of tantalum lining plate manufacturing, in particular to an integral punching and flanging forming device for a tantalum lining plate, solves the problems that in the prior art, the punching deviation is large, and the tantalum lining plate is prone to large deformation in the punching process, improves the punching and flanging precision, and improves the production efficiency. Comprise the flanging height, the hole diameter, the hole distance and the like, the concentricity of a pipe hole and a pipe plate hole for punching and flanging is guaranteed, the flanging size precision is high, the deformation is small, the flanging die comprises an upper die and a lower die, and the upper die moves up and down relative to the lower die; a plurality of punching needles protruding downwards are arranged on the bottom face of the upper die, the bottom face of the upper die is connected with a pressing plate through a plurality of soft springs, and a plurality of guide through holes allowing the punching needles to penetrate through and being in relative sliding fit with the punching needles are formed in the pressing plate; a plurality of flanging holes in one-to-one correspondence with the punching needles are formed in the top surface of the lower die, and arc-shaped chamfers are machined on the edges of the tops of the flanging holes.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment manufacturing, and in particular to the field of tantalum liner manufacturing, specifically to a device for integral punching and flanging forming of tantalum liner. Background Technology

[0002] Tantalum alloy (TaW2.5) is a rare and highly ductile metal that can be drawn into thin filaments to form foils. In heat exchanger equipment, to save costs, tube sheets are typically made of carbon steel. Therefore, it is crucial to ensure that the shell-side medium does not come into contact with the tube sheet to prevent damage from corrosion. Currently, a common method is to coat the surface of the tube sheet in contact with the corrosive medium with a tantalum liner. However, the small distance between the flanges of adjacent heat exchanger tube through-holes makes machining very difficult and dimensional accuracy challenging. This can negatively impact subsequent welding quality and easily lead to welding defects.

[0003] Currently, tantalum liner punching and flanging devices all use single-hole punching and flanging, resulting in a large number of punches—from dozens to hundreds—once per tantalum liner. The precision of a single punch is low, making it impossible to guarantee concentricity with the tube sheet holes, and the punching efficiency is low, leading to significant liner deformation. Although some equipment on the market uses upper and lower dies to punch and flange tantalum liners, the punches lack guidance and are prone to lateral displacement, resulting in large punching and flanging deviations. Furthermore, the direct punching process easily deforms the tantalum liner, leading to significant deformation. Utility Model Content

[0004] This utility model provides a tantalum liner integral punching and flanging forming device, which overcomes the problems of large deviation in the punching direction and large deformation of the tantalum liner during the punching process in the prior art. It improves the accuracy of punching and flanging, including dimensions such as flanging height, hole diameter, and hole spacing, and ensures the concentricity of the punched and flanged tube hole and the tube plate hole. The flanging dimension accuracy is high and the deformation is small.

[0005] This utility model is achieved through the following technical solution:

[0006] A device for integral punching and flanging forming of tantalum liner includes an upper die and a lower die, wherein the upper die moves vertically relative to the lower die;

[0007] The bottom surface of the upper mold is provided with several downward protruding punches. The bottom surface of the upper mold is connected to a pressure plate by multiple soft springs. The pressure plate is provided with several guide holes that allow the punches to pass through and slide relative to each other.

[0008] The top surface of the lower die is provided with several flanged holes that correspond one-to-one with the upper and lower parts of the punch, and the top edge of the flanged holes is machined with an arc-shaped chamfer.

[0009] Furthermore, the bottom surface of the lower mold is detachably connected to a base plate, the top surface of the upper mold is detachably connected to a top plate, the base plate is provided with multiple guide posts near its edge, and the top plate is provided with guide holes that slide with the guide posts.

[0010] Furthermore, 2-6 of the several flanged holes are fitted with positioning pins, and a spring is installed at the bottom of the positioning pin, with the bottom end of the spring connected to the base plate;

[0011] When the positioning pin is not pressed by the punch, the top of the positioning pin extends out of the flange hole; when the positioning pin is pressed by the punch, the positioning pin can enter the flange hole.

[0012] Furthermore, the top diameter of the positioning pin is equal to the diameter of the base hole of the tantalum liner, and the lower outer diameter of the positioning pin is equal to the inner diameter of the flange hole.

[0013] Furthermore, the top surface of the lower mold is provided with an inwardly recessed die groove, and the flange holes are distributed within the die groove.

[0014] Furthermore, the number of guide columns is four, and the bottom plate and top plate are rectangular steel plates.

[0015] The beneficial effects achieved by this utility model compared with the prior art are as follows:

[0016] 1. Place the tantalum liner on the top surface of the lower die. The upper die is moved downwards under the control of a hydraulic press. The pressure plate first contacts the surface of the tantalum liner. As the upper die moves downwards, the soft spring compresses, pressing the pressure plate against the surface of the tantalum liner to prevent deformation. As the upper die continues to move downwards, the punch passes through the guide hole of the pressure plate and, through the matching flange hole, punches and flanges the base hole of the tantalum liner. The guide hole of the pressure plate guides the punch to prevent lateral displacement. The top edge of the flange hole is machined with an arc chamfer to accurately control the flange curvature. After stamping is completed, the upper die moves upwards, and the pressure plate, with the help of its own soft spring, automatically demolds the tantalum liner.

[0017] This invention improves the precision of punching and flanging, including dimensions such as flanging height, hole diameter, and hole spacing, and ensures the concentricity of the tube hole and the tube plate hole of the punched and flanged. The flanging dimension precision is high and the deformation is small, realizing one-time punching and forming of tantalum liner. The high flanging dimension precision and small overall deformation not only improve the efficiency of pressing and forming, but also improve the welding quality of tantalum tube and flanging, and reduce assembly and grinding.

[0018] 2. Replacing the previous single-hole punching technology, this device solves the problems of easy deformation, low precision, low efficiency, and easy tilting of single-hole punching, and greatly improves the welding quality of tantalum liner plate and tantalum tube.

[0019] 3. When the positioning pin is not pressed by the punch, the top of the positioning pin extends out of the flange hole. When the positioning pin is pressed by the punch, the positioning pin can enter the flange hole. The positioning pin is used to position the tantalum liner by cooperating with the base hole of the tantalum liner, so as to avoid the tantalum liner from shifting and improve the processing accuracy. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the integral punching and flanging forming device for the tantalum liner described in this utility model;

[0021] Figure 2 This is a top view of the lower mold where the tantalum liner is placed, as described in this utility model.

[0022] Figure 3 This is an enlarged schematic diagram of the flange hole described in this utility model;

[0023] Figure 4 This is a schematic diagram of the tantalum liner in Example 1;

[0024] Figure 5 This is a schematic diagram of the state of the tantalum liner after the base hole is punched and flanged in Example 1;

[0025] In the diagram: 1. Pressure plate, 2. Upper mold, 3. Lower mold, 4. Base plate, 5. Soft spring, 6. Guide post, 7. Punch, 8. Positioning pin, 9. Flanged hole, 10. Tantalum liner, 11. Top plate, 12. Curved chamfer. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0028] As shown in 1-3, this embodiment discloses an integral punching and flanging forming device for tantalum liners, including a top plate 11, a bottom plate 4, a pressure plate 1, an upper mold 2, and a lower mold 3. The bottom plate 4 is fixed to the equipment base by a bracket, and the top plate 11 is connected to a hydraulic mechanism, which controls the up and down movement of the top plate 11.

[0029] The bottom surface of the lower mold 3 is detachably connected to the base plate 4 via bolt assemblies, and the top surface of the upper mold 2 is detachably connected to the top plate 11 via bolt assemblies. In this embodiment, both the base plate 4 and the top plate 11 are rectangular steel plates. Four upward-pointing guide posts 6 are located near the four corners of the base plate 4. Guide holes for sliding engagement with the guide posts 6 are provided at the four corners of the top plate 11, allowing the top plate 11 to move smoothly up and down relative to the guide posts 6 when it moves.

[0030] Several downward-protruding punches 7 are installed on the bottom surface of the upper mold 2. The punches 7 replicate the size and layout of the tube holes one-to-one according to the tube sheet hole layout, thereby achieving one-time punching and forming. The bottom surface of the upper mold 2 is connected to the pressure plate 1 by four soft springs 5. Several guide holes are machined on the pressure plate 1 to allow the punches 7 to pass through and slide relative to each other.

[0031] The top surface of the lower die 3 is machined with an inwardly recessed die groove, which can be inserted into the die groove when the upper die 2 moves downward. Several flanging holes 9 are machined on the top surface of the die groove of the lower die 3, which correspond one-to-one with the upper and lower parts of the punch 7. The top edge of the flanging holes 9 is machined with an arc-shaped chamfer 12. In this embodiment, the specification of the arc-shaped chamfer 12 is R3, which can control the arc of the punching and flanging of the tantalum liner.

[0032] To position the tantalum liner, 2-6 of the flanged holes 9 are fitted with positioning pins 8. A spring is installed at the bottom of each positioning pin 8, and the bottom end of the spring is connected to the base plate 4. The top diameter of the positioning pin 8 is equal to the diameter of the base hole in the tantalum liner, and the lower outer diameter of the positioning pin 8 is equal to the inner diameter of the flanged hole 9. When the positioning pin 8 is not pressed by the punch 7, its top protrudes from the flanged hole 9 and is inserted into the base hole of the tantalum liner to position it. When the positioning pin 8 is pressed by the punch 7, it can enter the flanged hole 9, causing the punch 7 to punch and flange the base hole.

[0033] The specific working process of the tantalum liner integral punching and flanging forming device described in this utility model is as follows:

[0034] The tantalum liner 10 has multiple pre-set base holes. The tantalum liner is placed on the top surface of the lower mold 3, allowing the base holes to be fitted into the positioning pins 8, thus positioning the tantalum liner. The upper mold 2 is moved downwards by a hydraulic press. The pressure plate 1 first contacts the surface of the tantalum liner. As the upper mold 2 moves downwards, the soft spring 5 is compressed, causing the pressure plate 1 to press against the surface of the tantalum liner to prevent deformation. As the upper mold 2 continues to move downwards, the punch 7 passes through the guide hole of the pressure plate 1 and punches and flangs the base holes of the tantalum liner through the flange hole 9. The guide hole of the pressure plate 1 guides the punch 7 to prevent lateral displacement. The top edge of the flange hole 9 is machined with an arc-shaped chamfer to accurately control the curvature of the flange.

[0035] This invention improves the precision of punching and flanging, including dimensions such as flanging height, hole diameter, and hole spacing, and ensures the concentricity of the tube hole and the tube sheet hole of the punched and flanged plate. The flanging dimension accuracy is high and the deformation is small, realizing one-time punching and forming of tantalum liner plate. The high flanging dimension accuracy and small overall deformation not only improve the efficiency of pressing and forming, but also improve the welding quality of tantalum tube and flanging, and reduce assembly and grinding.

[0036] Example 1

[0037] Taking the fabrication of a tantalum-inserted heat exchanger as an example, a total of 47 heat exchange tubes and 15 tantalum nails are required. The tantalum heat exchange tubes and nails need to be welded to the tantalum liner plate with flanges. The tantalum liner plate has a total of 62 holes, with the φ25.25 / φ16.25 holes on the tubes matched one-to-one with the holes on the tube sheet. High requirements are placed on the flange height (5mm), hole spacing, and hole diameter, ensuring a perfect fit between the assembled tubes and the tube sheet and tantalum heat exchange tubes. The specific processing steps are as follows:

[0038] 1) First, such as Figure 4 As shown, the tantalum liner 10 is cut into blanks. The basic holes of the tantalum liner are cut into blanks with a diameter of φ20.5 according to the arrangement of the tube sheet holes, and the surface oxide layer is polished.

[0039] 2) The tantalum liner integral punching and flanging forming device of this utility model is installed on a hydraulic press, separating the upper and lower molds. The tantalum liner is placed into the concave groove of the lower mold. With the pressure of the hydraulic press, the upper mold moves downward, pressing the upper and lower molds together. After the hydraulic press rises, the device uses the elastic force of its own soft spring to automatically demold the tantalum liner. Figure 5 As shown, 62 holes are punched and flanged in one step.

[0040] By using an integral forming device, the punching and flanging dimensions of the tantalum liner meet the requirements, the overall deformation is small, and the gap deviation after assembly with the tube sheet and tantalum heat exchange tubes meets the manufacturing process requirements, satisfying the welding conditions of the tantalum heat exchange tubes and the flanging.

[0041] Example 2

[0042] Taking the fabrication of a tantalum vaporizer as an example, a total of 282 heat exchange tubes are required. The tantalum heat exchange tubes need to be welded to the tantalum liner plate with flanges. The tantalum liner plate has a total of 282 holes. The φ19.25 holes of the tubes are matched one-to-one with the holes of the tube sheet. The flange height of 5mm, hole spacing, hole diameter and other requirements are high. After assembly, it is completely fitted with the tube sheet and tantalum heat exchange tubes.

[0043] 1) First, cut the tantalum liner plate. According to the arrangement of the tube sheet holes, cut the tantalum liner plate base holes at φ12.5 and grind the surface oxide layer.

[0044] 2) Install the tantalum liner integral punching and flanging forming device of this utility model onto the hydraulic press, so that the upper mold and the lower mold are separated, the tantalum liner is placed into the concave mold groove of the lower mold, and the upper mold is moved down by the pressure of the hydraulic press, pressing the upper mold and the lower mold together. After the hydraulic press rises, the device uses the elastic force of its own soft spring to automatically demold the tantalum liner, and the 282 holes are punched and flanged in one go.

[0045] By using an integral forming device, the punching and flanging dimensions of the tantalum liner meet the requirements, the overall deformation is small, and the gap deviation after assembly with the tube sheet and tantalum heat exchange tubes meets the manufacturing process requirements, satisfying the welding conditions of the tantalum heat exchange tubes and the flanging.

Claims

1. A device for forming a tantalum liner blank into a punched and flanged shape, comprising: It includes an upper mold and a lower mold, wherein the upper mold moves vertically relative to the lower mold; The bottom surface of the upper mold is provided with several downward protruding punches. The bottom surface of the upper mold is connected to a pressure plate by multiple soft springs. The pressure plate is provided with several guide holes that allow the punches to pass through and slide relative to each other. The top surface of the lower die is provided with several flanged holes that correspond one-to-one with the upper and lower parts of the punch, and the top edge of the flanged holes is machined with an arc-shaped chamfer.

2. The apparatus for punch flange forming of a tantalum liner panel of claim 1, wherein, The bottom surface of the lower mold is detachably connected to a base plate, and the top surface of the upper mold is detachably connected to a top plate. The base plate is provided with multiple guide posts near its edge, and the top plate is provided with guide holes that slide with the guide posts.

3. The apparatus for punch flange forming of a tantalum liner panel of claim 2, wherein, Two to six of the flanged holes are fitted with positioning pins, and a spring is installed at the bottom of the positioning pin, with the bottom end of the spring connected to the base plate. When the positioning pin is not pressed by the punch, the top of the positioning pin extends out of the flange hole; when the positioning pin is pressed by the punch, the positioning pin can enter the flange hole.

4. The apparatus for punch flange forming of a tantalum liner panel of claim 3, wherein, The top diameter of the positioning pin is equal to the diameter of the base hole in the tantalum liner, and the lower outer diameter of the positioning pin is equal to the inner diameter of the flange hole.

5. The apparatus for punch flange forming of a tantalum liner panel of claim 2, wherein, The top surface of the lower mold is provided with an inwardly recessed die groove, and the flange holes are distributed in the die groove.

6. The apparatus for punch flange forming of a tantalum liner panel of any one of claims 2-5, wherein, The number of guide columns is four, and the bottom plate and top plate are rectangular steel plates.

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