KR100385908B1 - Method for manufacturing welded bellows to protecting corrosion and Jigs thereof - Google Patents

Abstract

Method for producing a welded bellows for corrosion protection of the present invention comprises the steps of producing a circular disk-shaped metal plate by overlapping a plurality of metal plate (S10); Pressing the metal plates to form a wave (S20); Cutting the corrugated metal plates according to the specifications of each welded bellows to separate diaphragms (S30); Stacking the diaphragms together with jigs on a cylindrical first welding mold (S40); Arranging a welding nozzle into the inside of the first welding mold to weld the inner diameter portion to be contacted by pairing the two diaphragms (S50); Stacking each pair of diaphragms welded to the inner diameter portion in the second welding mold (S60), and welding the outer diameter portions of the diaphragms (S70) to minimize the loss of the metal plate generated in manufacturing. It is an innovative manufacturing method that can mass produce high quality welded bellows.

Description

Method for manufacturing welded bellows to protecting corrosion and Jigs et al.

The present invention relates to a method of manufacturing and supplying a welded bellows for corrosion protection, and in particular, corrosion, which is used throughout the industry, from the electronics industry to petrochemical, steelmaking, construction, nuclear measuring equipment, semiconductor equipment, and space development equipment. It relates to a method of manufacturing a welded bellows for prevention and a jig thereof.

Bellows are generally classified into molded bellows and welded bellows. Here, the molded bellows is injection molding an elastic material such as rubber by a mold, and the distance between the threads is relatively long so that the elastic force of a predetermined size can be maintained, so that the entire shaft length is long.

In addition, welded bellows are manufactured by welding waved diaphragms one by one, and can be manufactured with a relatively small shaft length, and have a larger stroke and repeatability than a general molded bellows. The shape retaining performance is excellent with respect to stretching and compression, and has a relatively large elasticity.

In particular, as shown in Fig. 1, the welded bellows is a joint of a corrugated box-type stretch material used when a part of the device requires flexibility, sealability, etc., and is applied to curved pipes and anti-vibration joints. In addition, it is widely used in automatic control, automatic adjustment switch, semiconductor industry, automobile industry, high performance valve, high vacuum industry, measuring instrument such as thermostat, aviation industry and the like, and is a high value-added technology-intensive product.

Such welded bellows act as a sealing means, such as a mechanical seal, in high-speed rotors, and in the construction field may also be used as an expansion joint.

As such, the welded bellows has great utility and industrial ripple effect in the entire industry, and is secretly known as the know-how of the production of the welded bellows. Currently, the Republic of Korea relies mostly on imported welded bellows.

Therefore, the present applicant has come up with a method of manufacturing a welded bellows for the corrosion protection of the original, as a result of many years of research efforts for the production of welded bellows.

An object of the present invention is to additionally supply an inert gas to the space opposite the welding site, to prevent the occurrence of corrosion, and to prevent corrosion that can enhance the fatigue strength due to repeated stretching and compression movement It is to provide a method of manufacturing a bellows type.

In addition, another object of the present invention is to reduce the number of processes in the welding of the bellows by using a plurality of welded jig, thereby reducing the manufacturing cost and to prevent corrosion that can produce a relatively high quality product It is to provide a jig used in the manufacturing method of the welded bellows.

1 is a schematic view for explaining the application of the general welded bellows,

2 is a perspective view illustrating a bellows manufactured by a method of manufacturing a welded bellows for preventing corrosion according to an embodiment of the present invention;

3 is a block diagram for explaining a method of manufacturing a welded bellows of the present invention for manufacturing the bellows shown in FIG.

4 is a block diagram for explaining a method for supplying an inert gas for preventing corrosion in the manufacturing method of FIG.

5 is a perspective view for explaining a disk-shaped metal plate according to the method of manufacturing a welded bellows for preventing corrosion of the present invention;

6 is a plan view for explaining a diaphragm according to a method of manufacturing a welded bellows for preventing corrosion of the present invention shown in FIG.

7 is a cross-sectional view illustrating a first weld mold used in the method of manufacturing a welded bellows for preventing corrosion of the present invention;

Figure 8a is a perspective view for explaining a ring-type jig used in the method of manufacturing a welded bellows for preventing corrosion of the present invention,

8B is a cross-sectional view for describing the shape of the ring jig illustrated in FIG. 8A;

9 is a cross-sectional view illustrating a second weld mold used in the method of manufacturing a welded bellows for preventing corrosion of the present invention.

♠ Explanation of symbols on the main parts of the drawing ♠

11, 14, 15: Diaphragm 20, 40, 41, 42: Jig

30: first welding mold 37: second welding mold

100: metal plate

An object of the present invention as described above is to overlap a plurality of metal plate, to produce a metal plate of a circular disk shape, to press the metal plate to form a wave, and the waved metal plate of each welded bellows Separating the diaphragms by cutting to a standard, laminating the diaphragms together with a jig made of a metal material such as copper (Cu) having good heat dissipation performance, and stacking the diaphragms in a cylindrical first weld mold; Arranging a welding nozzle inside the welding mold to weld the two inner diaphragms as a pair, and laminating each pair of diaphragms welded to the inner diameter portion on a second welding mold, and Welded bellows for corrosion prevention, comprising the step of welding the outer diameter portion It is achieved by the manufacturing method of woods.

In addition, another object of the present invention is to ring-shaped jigs made of a material such as copper (Cu) with good heat dissipation performance in order to maintain the gap between the diaphragms, and in various shapes and specifications to support the diaphragms inclined in a zigzag manner. A first welding in which a cover having a through hole in the center thereof is screwed onto a circular wall so as to closely contact the inclined wave jig having a wavy inclined surface with the diaphragm, the ring jig and the inclined wave jig. Welded bellows for corrosion protection, characterized in that it comprises a mold and a second welded mold screwed to the central axis of the crimping nut to axially compress the diaphragm welded to the inner diameter portion while sandwiching the ring-shaped jig between It is achieved by the jig used in the manufacturing method of the.

In the following, with reference to the accompanying drawings, a preferred embodiment of a method for manufacturing a welded bellows for preventing corrosion and the jig according to the present invention will be described in detail.

2 is a perspective view illustrating a bellows manufactured by a method of manufacturing a welded bellows for corrosion prevention according to an embodiment of the present invention, and FIG. 3 is a welding of the present invention for manufacturing the bellows shown in FIG. 2. 4 is a block diagram illustrating a method of manufacturing the bellows, and FIG. 4 is a block diagram illustrating a method of supplying an inert gas for preventing corrosion in the manufacturing method of FIG. 3.

As shown in FIG. 2, the welded bellows 10 manufactured through the present invention is used throughout the industry as described above, and is made of a corrugated annular diaphragm 11 made of stainless steel.

Here, the diaphragms 11 are welded to each of the inner diameter portion 13 and the outer diameter portion 12 of the diaphragms 11 so as to have a zigzag shape in cross section, so that the diaphragms 11 can be stretched and stretched in the axial direction. It is supposed to be.

As shown in Figure 3 and 4, the method of manufacturing a welded bellows for preventing corrosion of the present invention, when the mass production of the welded bellows 10 described above, to prevent the occurrence of corrosion in the space opposite to the weld site, To produce a durable product.

First, the method of manufacturing a welded bellows for preventing corrosion of the present invention overlaps a plurality of metal plates to produce metal plates having a circular disk shape (S10). Then, waves are simultaneously formed on the disk-shaped metal plates by press working (S20). Then, the corrugated metal plates are cut to meet the specifications of each welded bellows to separate the diaphragms (S30). Such diaphragms are stacked in a cylindrical first welding mold together with jigs made of a metal material such as copper (Cu) having good heat dissipation performance so that the inner diameter portion is fixed in the up and down direction (S40).

Here, the jigs stacked between the diaphragms inside the first welding die are ring-shaped jigs and warp-wave jigs, and are alternately stacked between the diaphragms (S41).

The welding nozzles of the plasma welding machine or the TIG welding machine are arranged inside the first welding mold stacked in this manner, and the two inner diaphragms are paired to perform automatic welding.

At this time, the first welding mold is rotated by the first turntable, and the welding current supplied at a high temperature and an appropriate amount of about 10,000 ° C sprayed from the above-described welding nozzle removes each inner diameter portion in pairs of two diaphragms. Weld (S50). Here, the lean meat welding means a form of welding in which the base metal itself melts by high heat and an appropriate amount of welding current to form a joint surface, rather than melting a welding rod supplied by automatic and means.

In addition, in the present invention, when welding the inner diameter portion of the diaphragm, inert gas is welded at the outer diameter side of the diaphragm through the first welding mold so that corrosion due to oxidation reaction is prevented from occurring at the back-bead of the diaphragm. It may further comprise the step of being supplied to the opposite space of (S51).

In addition, the present invention includes the step of separating the inclined wave jig when separating the diaphragm pair welded to the inner diameter portion of the first welding mold primarily (S52).

Then, each diaphragm pair welded to the inner diameter portion is individually inspected the welding state of the inner diameter portion through a general welding inspection (S53).

Each pair of diaphragms after the welding inspection is stacked on the second welding mold again (S60). In addition, the stacked diaphragms are rotated at the same time as the second welding mold by the second turntable, and are welded by the high heat and the welding current generated by the welding nozzle of the welding machine as described above (S70).

At this time, in order to prevent corrosion from occurring on the opposite side of the welding site, the above-described inert gas is injected from the second welding mold and supplied to the space opposite to the inner diameter portion of the diaphragm (S71).

Therefore, the diaphragms welded in a zigzag manner by each welding have a structure such as a welded bellows which has elastic force in the axial direction and is elastically movable, and undergoes a finishing process such as ultrasonic cleaning (S80).

Hereinafter, the shape of the first welded mold, the second welded mold, and the ring-shaped jig will be described in detail along with the description of the disk-shaped metal plate, which has been used in the method of manufacturing the welded bellows for preventing corrosion as described above.

5 is a view for explaining the disk-shaped metal plate 100 according to the method of manufacturing a welded bellows for preventing corrosion of the present invention. The disc-shaped metal plate 100 is very thin and has multiple layers of metal plates (approximately three) in order to produce a large amount of diaphragms used for manufacturing three types of welded bellows and to efficiently use materials. It is laminated | stacked and cut | disconnected to have a circular disk shape. Such a disk-shaped metal plate 100 is formed through press working and forms a hole that is a reference to the shaft center.

As shown in FIG. 6, the metal plate 100 is pressed to have a cross-section having a wave 16 in a ring shape by a mold.

The compacted metal plate 100 is simultaneously cut along a cutting line indicated by a dotted line using a press cutter, and therefore has an annular shape having three different diameters, each having two altitudes and one acid level. The diaphragms 11, 14, 15 are separated.

Since the separated diaphragms 11, 14, and 15 are cut at the same time, they can be used to fabricate welded bellows of different sizes, which can reduce the loss of the metal plate and shorten the manufacturing process.

On the other hand, as shown in Figure 7, the plurality of diaphragms 11, the ring-shaped jig 20 and the inclined wave jig (40, 41, 42) inside the first welded mold 30 provided in the present invention Alternately stacked together. Here, the jig 20, 40, 41, 42 is made of a copper (Cu) material that is very low thermal deformation, and can absorb high temperatures well.

In the present invention, the first welding mold 30 is fixed to be rotated (b) at a constant speed by the power rotary first turntable 31a commonly used for automatic welding, and is a conventional plasma welding machine or a tig welding machine. Used with

In particular, the first welding die 30 has a first gas supply passage 32a formed at its center so that the inert gas can be supplied from the first turntable 31a in a vertical direction. Here, the shaft center of the 1st turntable 31a and the shaft center of the 1st welding mold | type 30 match. Such first turntable 31a has a rotary joint (not shown; rotatable joint) which can be supplied with inert gas from the outside and rotatably coupled thereto, and has an internal space of the first turntable 31a connected to the gas port. Is connected to the first gas supply passage (32a) of the first welding mold 30 to receive the gas.

In addition, a plurality of first spray pipes 32b are formed on the circular wall 34 and the bottom surface of the first weld mold 30 to penetrate the first gas supply passage 32a. have. When the inert gas is supplied through the first gas supply passage 32a, the plurality of first injection pipes 32b are configured to inject the inert gas through the opened injection holes. That is, when sequentially welding the inner diameter part 13 of the diaphragm 11 rotated by the 1st turntable 31a, the welding nozzle 50 carries out the inert gas with the welding plasma flame, and the diaphragm 11 which is a welding part. It is supplied to the inner diameter part 13 of and welded.

At this time, the first welding mold 30 supplies the inert gas to the space opposite to the welding portion through the injection holes of the plurality of first spray pipes 32b, and therefore, the opposite side of the inner diameter portion 13 is welded. It does not corrode by oxidation reaction.

In addition, the second injection nozzles are formed on the bottom surface of the first welding mold 30 to upwardly inject the inert gas, so that the external air is further prevented from entering the welding site, thereby providing a smooth and uniform joint surface. It serves to maintain the welding environment having a.

The first welded mold 30 formed as described above is a cover which is screwed to close the diaphragms 11 and the ring-shaped jig 20 and the inclined wave-shaped jig 40, 41, and 42 stacked therein. (35) is provided. The cover 35 forms a through hole in the center thereof, so that the welding nozzle 50 of the welding torch can be inserted into the first welding mold 30 from the outside.

In particular, the inclined wave-shaped jig 40, 41, 42 has a variety of shapes and specifications to support the diaphragm 11 to be inclined in a zigzag manner, and has a wavy inclined surface.

In particular, as shown in FIGS. 8A and 8B, the ring-shaped jig 20 is disposed on the outer diameter side between the diaphragms so that the inner diameter portions of the stacked diaphragms closely support each other, and the outer diameter of the pair of diaphragms It serves to keep the spacing between the sites constant.

Such ring-shaped jig 20 is formed in a ring shape having a gap 24. In addition, the cross-sectional shape of the ring-shaped jig 20 forms a hook-like portion extending in the centrifugal direction from the outer portion 23, and the hook-shaped portion is the diaphragm described above with semi-circumferential surfaces 21 and 22 of different diameters. It serves to closely support the waves of the. In particular, the radius of the semi-circumferential surface 21 curved inwardly in the hook portion coincides with the radius of the wavy cross section of the diaphragms described above. Therefore, the ring-shaped jig 20 has a diameter and a cross-sectional shape to correspond to diaphragms of various specifications, of course.

As shown in FIG. 9, the pair of diaphragms 11 are inserted and stacked on the central axis 33 of the second weld mold 37 with the ring-shaped jig 20 sandwiched therebetween. Here, the central axis 33 of the second welding mold 37 has a diameter capable of hermetically inserting the pair of diaphragms 11 welded to the inner diameter portion, and forms a flange-shaped pedestal at the lower end thereof. And, a screw thread is formed on the top so that the crimping nut 39 can be screwed together. In addition, a screw thread is formed in the lower portion of the pedestal so that the second turntable 31b may be screwed to the inner space formed to receive the inert gas. The second weld mold 37 has various sizes and types to meet the specifications of the diaphragms 11.

The pressing nut 39 for compressing the stacked diaphragms 11 in the axial direction is screwed to the fixing screw part in the central axis 33 of the second welding mold 37 formed as described above.

On the other hand, the second welding mold 37 has a second gas supply passage 38 at the center of the central shaft 33 so that the inert gas can be supplied in the horizontal direction from the internal space of the second turn table 31b. Axially connecting the second injection pipes 38b extending to one side to form an inert gas environment at the inner diameter portions of the diaphragms 11, and the second injection pipes 38b axially connected to each other. The slits 38c are formed.

Therefore, the welding nozzle 50 sequentially welds each of the outer diameter portions 12 of the diaphragm 11 rotated by the second turntable 31b during automatic welding, and at this time, by supplying an inert gas together with the welding plasma flame. Inert gas is prevented from occurring at the outer diameter portion 12 of the diaphragm 11, which is a welded portion, and through the plurality of second spray pipes 38b of the second weld mold 37 to the space opposite to the welded portion. Is supplied so that the opposite side of the outer diameter part 12 of the diaphragm 11 is not corroded by the oxidation reaction by welding.

Therefore, the welded bellows 10 manufactured according to the present invention is subjected to the cleaning process with the ring-shaped jig 20 sandwiched between the diaphragms 11, and the gap of each ring-shaped jig 20 is opened by the welded bellows. Disassemble from (10).

As described in detail above, the method of manufacturing a welded bellows for preventing corrosion of the present invention supplies an inert gas to the opposite side of the welded portion, thereby preventing corrosion on the opposite side of the welded portion in advance, and having strong durability. It has the advantage of providing a welded bellows that can maintain its resilience even after hundreds of thousands of repeated compressions.

In the method of manufacturing a welded bellows for preventing corrosion of the present invention, a plurality of metal plates are stacked to form a disk-shaped metal plate, and then a plurality of ring-shaped diaphragms are simultaneously manufactured according to each specification and size, and the welded molds are By lamination and automatic welding, it is possible to minimize the loss of the metal plate generated in the manufacturing process, it is an innovative manufacturing method that can mass-produce high quality welded bellows.

In addition, the method of manufacturing a welded bellows for preventing corrosion of the present invention by supplying an inert gas to the opposite side of the welded portion, thereby preventing corrosion on the opposite side of the welded portion in advance, has a strong durability and repeated hundreds of thousands of times There is an advantage to provide a welded bellows that can maintain the restoring force in spite of the compression compression.

In addition, the ring-shaped jig and the inclined wave-shaped jig provided in the method for manufacturing a welded bellows for preventing corrosion of the present invention maintain a constant gap between diaphragms and at the same time serve to closely support for automatic welding. It is possible to mass produce high quality products.

In addition, since the method of manufacturing a welded bellows for preventing corrosion of the present invention is welded by a thorough welding, almost no beads are generated during welding, and a welded bellows suitable for precision products can be produced by providing a very smooth welding surface. There is an advantage.

In addition, the method of manufacturing a welded bellows for preventing corrosion of the present invention welds a pair of diaphragms welded to the inner diameter portion individually after welding inspection, so that the failure rate can be significantly lowered, and the productivity can be improved. There is an advantage.

The technical idea of the method for manufacturing and supplying a welded bellows for preventing corrosion of the present invention has been described above with the accompanying drawings, but this is by way of example and not by way of limitation. . In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (11)

In the manufacturing method of the welded bellows for corrosion prevention, Stacking a plurality of metal plates to produce disc-shaped metal plates (S10); Pressing the metal plates to form a wave (S20); Cutting the corrugated metal plates according to the specifications of each welded bellows to separate diaphragms (S30); Stacking the diaphragms together with jigs on a cylindrical first welding mold (S40); Arranging a welding nozzle into the inside of the first welding mold to weld the inner diameter portion to be contacted by pairing the two diaphragms (S50); Welded bellows for corrosion protection, comprising the step of laminating each pair of diaphragms welded to the inner diameter portion in the step (S60), welding the outer diameter portion of the diaphragms (S70) in the step Manufacturing method. The method of claim 1, The method further includes the step (S41) of alternately stacked between the diaphragms ring-shaped jigs and inclined wave-shaped jigs that are stacked between the diaphragms in the first welding mold (S41). Method of manufacturing welded bellows. The method of claim 1, When welding the inner diameter portion of the diaphragm, an inert gas is passed from the outer diameter side of the diaphragm to the space opposite to the welding portion through the first welding mold to prevent corrosion caused by oxidation reaction at the back-bead of the welding portion. Method of producing a welded bellows for preventing corrosion, characterized in that it further comprises the step of supplying (S51). The method of claim 1, The separation method of the welded bellows for corrosion prevention further comprises the step (S52) of separating the inclined wave jig when each diaphragm pair welded to the inner diameter portion in the first weld mold. . The method of claim 1, The welding step of the welded bellows for corrosion prevention further comprises the step (S53) of individually inspecting each diaphragm pair welded to the inner diameter portion, it is possible to increase the productivity of the product. The method of claim 1, When welding the outer diameter of the diaphragm, further comprising the step of supplying the inert gas to the space opposite the inner diameter portion of the diaphragm through the second welding mold to prevent corrosion on the opposite side of the welding portion (S71) Method for producing a welded bellows for corrosion protection, characterized in that. The method of claim 1, Method of producing a welded bellows for corrosion prevention further comprises the step (S80) after the welding process the outer diameter portion of the diaphragm through the ultrasonic cleaning process. In the jig used in the manufacturing method of the welded bellows to prevent corrosion, The jig includes ring-shaped jigs 20 made of a material such as copper (Cu) having good heat dissipation performance to maintain a gap between the diaphragms (11); Inclined wave-shaped jigs (40, 41, 42) having inclined surfaces that are waved in various shapes and specifications to support the diaphragms (11) in an inclined manner in a zigzag manner; A cover 35 having a through hole formed in the center thereof is screwed into the circular wall 34 so that the diaphragms 11 and the ring-shaped jig 20 and the inclined wave-shaped jig 40, 41, and 42 are in close contact with each other. A first welding mold 30 coupled to the coupling type; A second welding mold 37 is formed by screwing the crimping nut 39 to the central shaft 33 so as to compress the diaphragm 11 welded to the inner diameter portion with the ring-shaped jig 20 interposed therebetween. Jig used in the method of manufacturing a welded bellows for corrosion protection, characterized in that. The method of claim 8, The ring-shaped jig 20 is formed in a ring shape having a gap 24 through a portion of the ring-shaped jig 20, and a hook for closely contacting the waves 16 of the diaphragm 11 to the semi-circumferential surfaces 21 and 22 having different diameters. A jig for use in the method of manufacturing a welded bellows for preventing corrosion, characterized by forming a shape. The method of claim 8, The first welding mold 30 is fixed to the first rotary turntable 31a to be rotated (b), and the first gas is supplied to the shaft to receive the inert gas from the first turntable 31a. A passage 32a is formed, and a plurality of first spray pipes 32b connected to the first gas supply passage 32a are formed inside the wall 34, The jig used in the method of manufacturing a welded bellows for preventing corrosion, characterized in that for supplying an inert gas to the space opposite the welding portion through the injection holes of the first injection pipe (32b). The method of claim 8, The second welding die 37 is fixed to the power rotating second turntable 31b, and the second welding die 37 receives an inert gas from the inner space of the second turn table 31b in a horizontal direction. The second gas supply passage 38 is formed at the center of the central shaft 33 so that the second injection pipe tube extends through one side to form an inert gas environment at the inner diameter portion of the diaphragms 11. A jig for use in the method of manufacturing a welded bellows for corrosion protection, characterized by forming 38b).