A manufacturing device and method for a metal bellows

Abstract

The present invention relates to the field of metal bellows manufacturing, specifically to a manufacturing device and method for metal bellows, comprising: a cooling part, a pressing part and a supporting part; the cooling part surrounds the outer ring of the metal tube to be processed, and circulating cold water is introduced into the cooling part to cool the outer ring of the metal tube to be processed, the cooling circulation path in the cooling part is consistent with the corrugated path trajectory of the outer ring of the metal bellows, when the cold water in the cooling part cools the outer ring of the metal tube to be processed, the uncooled part of the outer ring of the metal tube to be processed maintains the ability to be molded and deformed by extrusion. The present invention produces metal bellows by first heating the metal tube to be processed and then extruding the metal tube to be processed. When the metal tube to be processed is heated, the moldability is improved, and metal bellows with a wall thickness of more than 4 mm can be produced, and it can be pressed and molded in one time, with high production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of metal bellows manufacturing, and in particular to a manufacturing device and method for a metal bellows. Background Art

[0002] The manufacturing methods of metal bellows mainly include hydraulic forming, mechanical bulging, rubber forming and mechanical hydraulic forming.

[0003] Hydroforming is the most common and widely used method, suitable for manufacturing annular bellows, and can form bellows with a wall thickness of 0.08-4mm. This method uses the liquid pressure inside the tube blank to expand the tube and then compress it into a bellows. It is particularly suitable for the manufacture of small-diameter metal bellows; however, it is usually only suitable for the manufacture of bellows with a wall thickness of 0.08-4mm.

[0004] Mechanical bulging includes methods such as spinning and rolling, which have the advantages of simple process, easy tooling manufacturing, and high production efficiency. This method is mostly used in the manufacture of spiral bellows, bellows expansion joints, and large-diameter thick-walled bellows; however, the production efficiency is low, and usually only plastic or rubber bellows can be processed.

[0005] The rubber forming process is a bulging process that uses rubber as a forming punch, which deforms under pressure and forms the tube blank into a bellows according to the concave mold cavity. It is usually used for single-wave continuous forming; but it can only process plastic or rubber bellows.

[0006] Mechanical hydraulic forming combines mechanical and hydraulic methods. First, the bellows are rolled inward by rolling, and then expanded outward by hydraulic method to form a bellows. This method can effectively enhance the elastic properties of the bellows and is an effective process for manufacturing deep-wave bellows. However, the corrugations on the surface of the bellows are usually formed by expanding outward one by one, which has low processing efficiency. In addition, the outward expansion method has high requirements for the wall thickness of the bellows, and usually only bellows between 0.08mm and 4mm can be processed.

[0007] In summary, the methods used in the prior art for producing corrugated pipes are difficult to achieve efficient production of metal corrugated pipes with a wall thickness of more than 4 mm.

[0008] In view of this, we propose a manufacturing device and method for a metal bellows to solve the above problems. Summary of the invention

[0009] The object of the present invention is to provide a manufacturing device and method for a metal bellows, so as to solve the problems raised in the above-mentioned background technology.

[0010] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0011] A manufacturing device for a metal bellows, comprising: a cooling part, a pressing part and a supporting part;

[0012] The cooling part surrounds the outer ring of the metal tube to be processed, and circulating cold water is introduced into the cooling part to cool the outer ring of the metal tube to be processed. The cooling circulation path in the cooling part is consistent with the corrugation path trajectory of the outer ring of the metal bellows. When the cold water in the cooling part cools the outer ring of the metal tube to be processed, the uncooled part of the outer ring of the metal tube to be processed maintains the ability to be molded and deformed by extrusion;

[0013] The pressing part includes a fixed end and an extrusion end, one end of the metal pipe to be processed is fixed to the fixed end, and the other end is compressed toward the fixed end by the pressure of the extrusion end;

[0014] The support part comprises a telescopic support column, which is telescopic in two areas, the inner circle of the metal tube to be processed and the outer area of ​​the metal tube to be processed.

[0015] Optionally, the cooling part includes a metal cooling pipe, which is in a spiral structure and surrounds the outer ring of the metal pipe to be processed.

[0016] Optionally, the cooling part comprises an upper die and a lower die arranged up and down, and a cooling channel is arranged in each of the upper die and the lower die, and a plurality of cooling channels are arranged;

[0017] The first electric push rod and the second electric push rod are respectively fixedly connected to the surfaces of the upper die and the lower die that are away from each other.

[0018] Optionally, the cooling channel has an annular structure, and a plurality of cooling channels are distributed at equal distances.

[0019] Optionally, the cooling channel has a spiral structure, and multiple cooling channels are distributed at equal distances.

[0020] Optionally, adjacent cooling channels are connected via a connecting channel, and the connecting channel is in a concave shape, with the concave opening facing a position close to the metal pipe to be processed.

[0021] Optionally, the cooling part has an inlet end and a discharge end for circulating cold water to enter and exit.

[0022] Optionally, the fixed end includes a positioning support plate, the positioning support plate is fixedly connected to the upper surface of the base, a mounting groove is provided in the middle of the positioning support plate, a replaceable support plate is spliced ​​in the mounting groove, a circular hole is provided in the middle of the replaceable support plate, a fixed support plate is also fixedly provided on the upper surface of the base, an elastic telescopic cylinder is fixedly provided on the fixed support plate, a first connecting plate is fixedly connected to the telescopic end of the elastic telescopic cylinder, the first connecting plate is fixedly connected to one end of the support column, and the other end of the support column corresponds to the circular hole;

[0023] The extrusion end includes a pressing plate, a second support plate is fixedly arranged on the upper surface of the base, an electric cylinder is fixedly arranged in the middle of the second support plate, the telescopic end of the electric cylinder is fixedly connected to the pressing plate, and an elastic telescopic rod is also arranged between the pressing plate and the second support plate. One end of the metal tube to be processed is fixed on the surface of the replaceable support plate, and the other end of the metal tube to be processed is attached to a side of the pressing plate close to the replaceable support plate.

[0024] Optionally, both the upper die and the lower die are provided with a smooth area and a corrugated area, and the number of cooling channels on the smooth area is less than the number of cooling channels on the corrugated area.

[0025] The present invention also discloses a method for manufacturing a metal bellows, comprising the following steps:

[0026] S1: Heating, heating the metal tube to be processed to the extent that it can be shaped and deformed, that is, the appearance is red hot;

[0027] S2: Partial cooling, a cooling part is provided at the outer ring of the metal tube to be processed, circulating cold water is passed into the cooling part, and the circulation path of the cold water is consistent with the corrugation path trajectory of the outer ring of the metal bellows after processing and forming, so that the outer ring of the metal tube to be processed is hardened along the position adjacent to the area to be plastically deformed;

[0028] S3: Pressing and deforming, squeezing the two ends of the metal tube to be processed, when the metal tube to be processed is pressed, the uncooled position of the outer surface of the metal tube to be processed is squeezed and deformed to form a metal bellows;

[0029] S4: To produce a metal corrugated tube with a smooth inner ring, a support column is provided in the middle of the metal tube to be processed. When the metal tube to be processed is pressed together, the support column supports the inner ring of the metal tube to be processed, ensuring that the inner ring of the metal tube to be processed remains smooth when it is squeezed and deformed.

[0030] Compared with the prior art, the present invention provides a manufacturing device and method for a metal bellows, which has the following beneficial effects:

[0031] The present invention produces a metal corrugated tube by first heating the metal tube to be processed and then extruding the metal tube to be processed. When the metal tube to be processed is heated, the molding ability is improved, and a metal corrugated tube with a wall thickness of more than 4 mm can be produced. The metal corrugated tube is pressed and formed in one time, and the production efficiency is high.

[0032] The present invention can produce metal bellows with shapes such as inner ring with corrugation, inner ring without corrugation, outer ring with corrugation, outer ring without corrugation, and outer ring with discontinuous corrugation, and has a wide range of applications.

[0033] The present invention is based on the fact that the cooling part is easy to produce and customize. The present invention can also easily produce metal bellows with radial cross-sections of any complex shapes such as triangle, square, ellipse, etc., and the production is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a manufacturing device for a metal bellows of the present invention;

[0035] Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement in the middle;

[0036] Figure 3 It is a schematic diagram of the structure when the support column of the present invention extends into the second corrugated tube;

[0037] Figure 4 It is a schematic diagram of the structure of the metal cooling pipeline of the present invention;

[0038] Figure 5 It is a schematic diagram of the first bellows structure of the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of the second bellows of the present invention;

[0040] Figure 7 It is a schematic diagram of the structure of a metal bellows having corrugations on both the inner and outer rings of the present invention;

[0041] Figure 8 This is a schematic diagram of the cooling unit structure in Example 3 of the present invention;

[0042] Fig. 9 It is a schematic structural diagram of the metal tube to be processed being pressed into a first corrugated tube in Example 3 of the present invention;

[0043] Fig.10 A schematic diagram of the cooling part structure when producing a customized metal bellows according to the present invention;

[0044] Fig.11 A schematic diagram of the structure of a customized metal bellows according to the present invention;

[0045] Fig.12It is a schematic diagram of the connecting channel structure of the present invention.

[0046] In the figure: 1. base; 2. metal cooling pipe; 3. first bellows; 4. positioning support plate; 5. mounting groove; 6. replaceable support plate; 7. round hole; 8. fixed support plate; 9. elastic telescopic cylinder; 10. first connecting plate; 11. support column; 12. electric cylinder; 13. pressing plate; 14. elastic telescopic rod; 15. second support plate; 16. second bellows; 17. flange connection end; 18. upper die; 19. first electric push rod; 20. third support plate; 21. lower die; 22. second electric push rod; 23. metal pipe to be processed; 24. cooling channel; 25. smooth area; 26. corrugated area; 27. smooth section; 28. corrugated section; 29. ​​connecting channel. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1, please refer to the attached manual Figure 1-7 The present invention provides a technical solution: a manufacturing device for a metal bellows, comprising: a cooling part, a pressing part and a supporting part; the present invention also discloses a manufacturing method for a metal bellows, comprising the following steps:

[0049] The first step is heating, heating the metal tube 23 to be processed to a degree that it can be molded and deformed, that is, the appearance is red hot.

[0050] Step 2: Partial cooling. The cooling part is set at the outer ring of the metal tube 23 to be processed. Circulating cold water is passed through the cooling part. The circulation path of the cold water is consistent with the corrugated path trajectory of the outer ring of the metal bellows after processing and forming, so that the outer ring of the metal tube 23 to be processed is hardened along the position adjacent to the area to be plastically deformed.

[0051] The third step: pressing and deforming, using the pressing part to squeeze the two ends of the metal tube 23 to be processed. When the metal tube 23 to be processed is pressed, the uncooled position of the outer surface of the metal tube 23 to be processed is squeezed and deformed to form a metal bellows.

[0052] Step 4: The inner ring of the metal bellows produced above is also corrugated. If there is a need to produce a metal bellows with a smooth inner ring, the support part: the support column 11 is filled in the interior of the metal tube 23 to be processed. When the pressing part presses the metal tube 23 to be processed, the inner ring of the metal tube 23 to be processed is blocked by the support column 11. When the metal tube 23 to be processed is deformed, its inner ring will not be deformed, thereby maintaining the inner ring in a smooth state.

[0053] In the present invention, the metal bellows is produced by first heating the metal tube 23 to be processed and then extruding it. When the metal tube 23 to be processed is heated, the molding ability is improved, and a metal bellows with a wall thickness of more than 4 mm can be produced. The metal bellows can be pressed and formed in one time, and the production efficiency is high.

[0054] Furthermore, according to actual needs, the metal bellows with a corrugated or smooth inner ring can be produced, such as Figure 5 The first bellows 3 is shown as having a corrugated shape in both inner and outer circles. Figure 6 As shown, the inner ring has a smooth surface, and the outer ring has a corrugated second bellows 16, as shown in FIG. Figure 7 As shown, after the flange connection ends 17 are fixedly spliced ​​at both ends of the first bellows 3, a single-section metal bellows is formed.

[0055] The present invention has two cooling modes, which are selectively used according to the thickness of the metal bellows actually produced to achieve the purpose of saving energy.

[0056] Specifically, when producing metal bellows with a thickness of less than 10 mm, the cooling part arrangement method in Example 2 may be selected; when producing metal bellows with a thickness of 10 mm or more, the cooling part arrangement method in Example 3 may be selected.

[0057] In Example 2, please refer to the attached Figure 1-7The present invention provides a technical solution: a manufacturing device for a metal bellows, wherein a cooling part surrounds the outer ring of a metal tube 23 to be processed, and circulating cold water is introduced into the cooling part to cool the outer ring of the metal tube 23 to be processed, and the cooling circulation path in the cooling part is consistent with the corrugation path trajectory of the outer ring of the metal bellows. When the cold water in the cooling part cools the outer ring of the metal tube 23 to be processed, the uncooled part of the outer ring of the metal tube 23 to be processed maintains the ability to be molded and deformed by extrusion; the cooling part has an inlet end and a discharge end for circulating cold water to enter and exit; the cooling part It includes a metal cooling pipe 2, which has a spiral structure and surrounds the outer ring of the metal pipe 23 to be processed. When working, circulating cold water enters the metal cooling pipe 2 from the inlet end, and cools the outer ring of the metal pipe 23 to be processed along the corrugated track that the outer ring of the metal pipe 23 to be processed is about to be processed. After being cooled, the surface of the metal pipe 23 to be processed is hardened, and its ability to be shaped and deformed is reduced. When the pressing part is pressed on the end of the metal pipe 23 to be processed, the metal pipe 23 to be processed is squeezed and only the unhardened area can be squeezed and deformed, thereby forming corrugations.

[0058] Furthermore, since the wall thickness of the metal cooling pipe 2 is relatively small and the heat transfer efficiency is high, the use of cold water during cooling can be reduced, saving energy. Since the metal bellows with a wall thickness of less than 10 mm is easy to deform and will not excessively squeeze the metal cooling pipe 2, there is no need to consider the situation where the metal cooling pipe 2 is damaged by squeezing. It is suitable for the production of metal bellows with a wall thickness of less than 10 mm.

[0059] It should be noted that the metal cooling pipe 2 has the ability to be elastically deformed. After the metal bellows is formed and cooled, the metal bellows can be pulled out of the metal cooling pipe 2 by one end of the metal bellows. The metal cooling pipe 2 will elastically deform within a certain range to avoid the metal bellows being difficult to remove.

[0060] It should also be noted that the circulating cold water can be composed of a water pump, a water tank, and a heat pipe or a refrigerator for cooling the circulating discharged water. This is a common existing technology and will not be described in detail here.

[0061] In Example 3, please refer to the attached Figure 1-8The present invention provides a technical solution: a manufacturing device for a metal corrugated pipe, wherein the cooling part comprises an upper die 18 and a lower die 21 arranged in a vertical direction, wherein the upper die 18 and the lower die 21 are both provided with cooling channels 24, and the cooling channels 24 are provided with a plurality of them; the upper die 18 and the lower die 21 are respectively fixedly connected with a first electric push rod 19 and a second electric push rod 22 on the sides away from each other, and the other end of the first electric push rod 19 is fixedly connected with a third support plate 20, and the third support plate 20 can be fixed on the upper frame or ceiling, which will not be described in detail here; the other end of the second electric push rod 22 is fixedly connected to the upper surface of the base 1, and when the first electric push rod 19 and the second electric push rod 22 are started, the lower die 21 and the upper die 18 can be pressed together at the outer circle of the metal pipe 23 to be processed, so as to achieve the purpose of pressing together.

[0062] When circulating cold water is introduced into the cooling channel 24, the surface of the metal tube 23 to be processed is hardened after being cooled, and its ability to be molded and deformed is reduced. When the pressing part is pressed on the end of the metal tube 23 to be processed, the metal tube 23 to be processed can only be squeezed and deformed in the unhardened area, thereby forming corrugations; due to the extrusion limiting effect of the upper die 18 and the lower die 21, the outside of the metal tube 23 to be processed has sufficient support, which is particularly suitable for the production of metal corrugated tubes with a wall thickness of 10 mm and above; however, due to the setting of the upper die 18 and the lower die 21, the heat transfer efficiency is reduced, and a part of water resources will be relatively wasted. It can be used according to actual needs and will not be elaborated here.

[0063] In Example 4, please refer to the attached Figure 1-12 The present invention provides a technical solution: a manufacturing device for a metal bellows, wherein a pressing portion includes a fixed end and an extrusion end, one end of a metal tube 23 to be processed is fixed to the fixed end, and the other end is compressed toward the fixed end by the pressure of the extrusion end; the supporting portion includes a telescopic supporting column 11, and when the supporting column 11 is extended or retracted, it extends or retracts in two areas: the inner circle of the metal tube 23 to be processed and the outer area of ​​the metal tube 23 to be processed.

[0064] The fixed end includes a positioning support plate 4, which is fixedly connected to the upper surface of the base 1, and a mounting groove 5 is provided in the middle of the positioning support plate 4. A replaceable support plate 6 is spliced ​​in the mounting groove 5, and a circular hole 7 is provided in the middle of the replaceable support plate 6. A fixed support plate 8 is also fixedly provided on the upper surface of the base 1, and an elastic telescopic cylinder 9 is fixedly provided on the fixed support plate 8. The telescopic end of the elastic telescopic cylinder 9 is fixedly connected with a first connecting plate 10, and the first connecting plate 10 is fixedly connected to one end of a support column 11, and the other end of the support column 11 corresponds to the circular hole 7; the extrusion end includes a pressing plate 13, and a second support plate 15 is fixedly provided on the upper surface of the base 1, and an electric cylinder 12 is fixedly provided in the middle of the second support plate 15. The telescopic end of the electric cylinder 12 is fixedly connected to the pressing plate 13, and an elastic telescopic rod 14 is also arranged between the pressing plate 13 and the second support plate 15. One end of the metal tube 23 to be processed is fixed on the surface of the replaceable support plate 6, and the other end of the metal tube 23 to be processed is attached to the side of the pressing plate 13 close to the replaceable support plate 6; when working, one end of the metal tube 23 to be processed can be fixed to the replaceable support plate 6 by screws, magnetic attraction or any suitable fixing method. After the outer ring of the metal tube 23 to be processed is cooled, the electric cylinder 12 is started, and the electric cylinder 12 pushes the pressing plate 13 to press the metal tube 23 to be processed, so as to realize the pressing of the metal tube 23 to be processed. The metal tube 23 to be processed can be manufactured as a metal bellows.

[0065] When it is necessary to manufacture a corrugated tube with a smooth inner ring, the replaceable support plate 6 of appropriate specifications can be replaced according to the diameter of the metal bellows, so that the circular hole 7 in the middle of the replaceable support plate 6 is consistent with the inner diameter of the metal bellows, and the support column 11 can be just supported on the inner wall of the metal bellows when it extends from the circular hole 7, which is convenient and practical, and the first connecting plate 10 at the end of the support column 11 is connected by an elastic telescopic cylinder 9, and the elastic telescopic cylinder 9 is pneumatically retracted, that is, when the air pump inflates the elastic telescopic cylinder 9, the elastic telescopic cylinder 9 extends, and when the gas in the elastic telescopic cylinder 9 is extracted, the elastic telescopic cylinder 9 automatically resets using the spring arranged inside it, so that the support column 11 enters the interior of the metal tube 23 to be processed to achieve a supporting effect; when the pressing plate 13 presses the metal tube 23 to be processed, since the length of the metal tube 23 to be processed gradually decreases, the support column 11 will also be gradually pushed out, and the arrangement of the support column 11 and the elastic telescopic cylinder 9 will not affect the pressing of the pressing plate 13 on the metal tube 23 to be processed.

[0066] The present invention can also produce an outer ring with spiral or annular corrugations according to actual needs, and specifically, the cooling channel 24 can be selectively set to a ring structure, or the cooling channel 24 can be set to a spiral structure.

[0067] In actual use, the plurality of cooling channels 24 may be distributed at equal distances.

[0068] When the upper die 18 and the lower die 21 are used to produce a metal bellows, due to the separate setting between the upper die 18 and the lower die 21, adjacent cooling channels 24 need to be connected through a connecting channel 29. The connecting channel 29 is concave in shape, and the opening of the concave shape faces a position close to the metal tube 23 to be processed, so that cold water can flow between adjacent cooling channels 24. Due to the setting of the connecting channel 29, the cold water flowing between adjacent cooling channels 24 is away from the metal tube 23 to be processed. Therefore, the cold water in the connecting channel 29 will not cool the outer surface of the metal tube 23 to be processed, which can solve the defect that this method cannot produce metal bellows with continuous corrugations. In addition, according to actual needs, a heat insulation method such as a heat insulation board can be set at the position of the connecting channel 29 close to the metal tube 23 to be processed to further reduce the effect of cold water on the outer circle of the metal tube 23 to be processed. It can be set according to actual needs.

[0069] The present invention can also produce customized metal bellows, that is, metal bellows with discontinuous outer surface corrugations or arranged in an arbitrary manner, such as: smooth areas 25 and corrugated areas 26 are provided on both the upper die 18 and the lower die 21, and the number of cooling channels 24 on the smooth area 25 is less than the number of cooling channels 24 on the corrugated area 26, so that when the pressing part presses the metal tube 23 to be processed, only the outer surface of the metal bellows corresponding to the position of the corrugated area 26 has corrugations, while the outer surface of the metal bellows corresponding to the position of the smooth area 25 is smooth. Fig.11 Shown in FIG. 1 is a corrugated metal pipe having a smooth section 27 and a corrugated section 28 .

[0070] It should also be noted that, based on the ease of production and customization of the cooling part, the present invention can also easily produce metal bellows with radial cross-sections of any complex shapes such as triangles, squares, ellipses, etc. The production is simple and convenient, and only the cooling part of the appropriate shape needs to be customized and manufactured, which is highly practical.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manufacturing device for a metal bellows, characterized in that: include: Cooling section, pressing section and supporting section; The cooling part surrounds the outer ring of the metal tube (23) to be processed, and circulating cold water is introduced into the cooling part to cool the outer ring of the metal tube (23) to be processed. The cooling circulation path in the cooling part is consistent with the corrugation path trajectory of the outer ring of the metal bellows. When the cold water in the cooling part cools the outer ring of the metal tube (23) to be processed, the uncooled part of the outer ring of the metal tube (23) to be processed maintains the ability to be molded and deformed by extrusion; The pressing part comprises a fixed end and an extrusion end, one end of the metal tube (23) to be processed is fixed to the fixed end, and the other end is compressed toward the fixed end by the pressure of the extrusion end; The support portion comprises a telescopic support column (11), and when the support column (11) is telescopic, it telescopes in two areas, namely, the inner circle of the metal tube (23) to be processed and the outer area of ​​the metal tube (23) to be processed; The cooling part comprises a metal cooling pipe (2), the metal cooling pipe (2) is in a spiral structure and surrounds the outer ring of the metal pipe (23) to be processed; The cooling part comprises an upper die (18) and a lower die (21) arranged one above the other, wherein the upper die (18) and the lower die (21) are both provided with cooling channels (24), and a plurality of cooling channels (24) are provided; The upper die (18) and the lower die (21) are respectively fixedly connected with a first electric push rod (19) and a second electric push rod (22) on the sides away from each other; Adjacent cooling channels (24) are connected via a connecting channel (29), the connecting channel (29) is in a concave shape, and the concave opening faces a position close to the metal pipe (23) to be processed; The fixed end comprises a positioning support plate (4), the positioning support plate (4) is fixedly connected to the upper surface of the base (1), a mounting groove (5) is arranged in the middle of the positioning support plate (4), a replaceable support plate (6) is arranged in a spliced ​​manner in the mounting groove (5), a circular hole (7) is arranged in the middle of the replaceable support plate (6), a fixed support plate (8) is also fixedly arranged on the upper surface of the base (1), an elastic telescopic cylinder (9) is fixedly arranged on the fixed support plate (8), the telescopic end of the elastic telescopic cylinder (9) is fixedly connected to a first connecting plate (10), the first connecting plate (10) is fixedly connected to one end of a support column (11), and the other end of the support column (11) corresponds to the circular hole (7); The extrusion end comprises a pressing plate (13), a second support plate (15) is fixedly arranged on the upper surface of the base (1), an electric cylinder (12) is fixedly arranged in the middle of the second support plate (15), the telescopic end of the electric cylinder (12) is fixedly connected to the pressing plate (13), an elastic telescopic rod (14) is also arranged between the pressing plate (13) and the second support plate (15), one end of the metal tube (23) to be processed is fixed on the surface of the replaceable support plate (6), and the other end of the metal tube (23) to be processed is attached to a side of the pressing plate (13) close to the replaceable support plate (6); The upper die (18) and the lower die (21) are both provided with a smooth area (25) and a corrugated area (26), and the number of cooling channels (24) on the smooth area (25) is less than the number of cooling channels (24) on the corrugated area (26); The cooling channel (24) is in an annular structure or a spiral structure, and a plurality of cooling channels (24) are distributed at equal distances.

2. A manufacturing device for a metal bellows according to claim 1, characterized in that: The cooling part has an inlet end and a discharge end for circulating cold water to enter and exit.

3. A method for manufacturing a metal bellows, characterized in that: The manufacturing device of the metal bellows according to any one of claims 1 to 2 comprises the following steps: S1: heating, heating the metal tube (23) to be processed to a degree that it can be molded and deformed, i.e., a red hot state in appearance; S2: Partial cooling, a cooling part is provided at the outer ring of the metal tube (23) to be processed, circulating cold water is passed into the cooling part, and the circulation path of the cold water is consistent with the corrugation path trajectory of the outer ring of the metal bellows after processing and forming, so that the outer ring of the metal tube (23) to be processed is hardened along the position adjacent to the area to be plastically deformed; S3: Pressing and deforming, squeezing the two ends of the metal tube (23) to be processed, when the metal tube (23) to be processed is pressed, the uncooled position of the outer surface of the metal tube (23) to be processed is squeezed and deformed to form a metal bellows; S4: Produce a metal corrugated tube with a smooth inner ring, wherein a support column (11) is provided in the middle of the metal tube (23) to be processed. When the metal tube (23) to be processed is pressed, the inner ring of the metal tube (23) to be processed is supported by the support column (11), thereby ensuring that the inner ring of the metal tube (23) to be processed remains smooth when it is squeezed and deformed.

Images