CN117463854A - A forming method for pipe fittings with flanges on both sides - Google Patents
A forming method for pipe fittings with flanges on both sides Download PDFInfo
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- CN117463854A CN117463854A CN202311284286.6A CN202311284286A CN117463854A CN 117463854 A CN117463854 A CN 117463854A CN 202311284286 A CN202311284286 A CN 202311284286A CN 117463854 A CN117463854 A CN 117463854A
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- forming
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- die
- flanging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/12—Edge-curling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
- B21D39/203—Tube expanders with mandrels, e.g. expandable expandable by fluid or elastic material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to the field of flanging forming of metal pipes, in particular to a forming method of pipe fittings with flanging at two sides, which is suitable for forming pipe fittings with flanging at two sides and special-shaped cross sections. According to the method, the pipe blank is expanded along the shape of the die by using a method of filling high-pressure liquid into the straight pipe blank, the pipe fitting feeding is controlled by adopting the push heads at two sides to adjust the stress state of the pipe fitting during deformation, the loading perpendicular to the axial direction of the pipe fitting can be realized by controlling the movement of the die, further the forming of special pipes including flat pipes is achieved, the obtained reducer pipe fitting with large expansion rate is taken out, and the top end of the expansion area is cut off according to the size requirement to realize the forming of the final pipe fitting with flanging at two sides. The invention can realize the forming of pipe fittings with flanges on both sides of various cross-sectional shapes, simultaneously can form a plurality of pipe fittings with flanges on both sides at one time, has high forming efficiency, and overcomes the forming defects of flange cracking, poor surface quality, difficult flange forming of pipe fittings with special-shaped cross sections and the like in the traditional pipe fitting flange technology.
Description
Technical Field
The invention relates to the field of flanging forming of metal pipes, in particular to a forming method of a pipe fitting with flanging at two sides, which is suitable for forming the pipe fitting with flanging at two sides (comprising a special-shaped section).
Background
The pipeline system plays a very important role and has a very important role in the industrial fields of aerospace, nuclear power, automobiles and the like, the service conditions of many pipeline systems are extreme, and the problems of loose connection, poor tightness and the like easily occur at the connecting position of a conduit in the service process of the pipeline, so that the connection of the pipeline system directly influences the reliability of the pipeline system. The flange connection is adopted in the connection of tubular components, and the flange of the pipe fitting is mainly obtained through flanging of the pipe fitting at present, so that the flanging quality of the pipe fitting is very necessary.
Aiming at flanging forming of pipe fittings, the current common processes mainly comprise stamping flaring forming, spinning flanging, electromagnetic flanging and the like. However, the conventional flanging process also has many limitations, such as: when the flanging amount of the pipe fitting is relatively large, the problems of serious thickness reduction, even cracking, poor surface quality and the like of the flanging outer edge wall exist; when the flanging of the pipe fitting with the special-shaped section is formed, the section shape is asymmetric; when the shape of the local part is greatly changed, the material at the local part is easy to accumulate and wrinkle, and the traditional process is difficult to form. In addition, the current pipe flanging process is concentrated on flanging forming of a single side of the pipe, and when flange features are arranged on two sides of the pipe, the traditional flanging process needs multi-pass forming, so that the forming efficiency is low. Particularly, the forming difficulty of the special-shaped cross section pipe fitting with flanges at two sides is higher, the pipe fitting can be formed by welding only after flanges at two sides of the plate, and a plurality of patches are welded at the welding positions of the two plates for forming, so that the welding difficulty is high, the reliability of the whole pipe fitting is reduced, and the improvement of the prior art is urgently needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a forming method of a pipe fitting with flanging at two sides, which solves the forming defects of flanging cracking, poor surface quality, difficult flanging of a pipe fitting with a special-shaped section and the like in the traditional pipe fitting flanging process.
In order to solve the technical problems, the invention adopts the following technical scheme:
a forming method of a pipe fitting with flanging at two sides comprises the following steps:
step 1: according to the shape of the needed formed product, designing and processing an upper hydraulic forming die, a lower hydraulic forming die and a push head, and selecting a proper tube blank size to be matched with the shape and the size of a cavity of the upper hydraulic forming die and the lower hydraulic forming die;
step 2: the hydraulic forming lower die is kept fixed, a tube blank is placed in a lower die cavity of the hydraulic forming lower die, the lower die cavity of the hydraulic forming lower die is in sliding fit with the tube blank, and after the hydraulic forming upper die and the hydraulic forming lower die are matched, push heads on the left side and the right side move to seal two ends of the tube blank;
step 3: starting a liquid filling part of a hydraulic bulging machine to fill high-pressure liquid into a sealed tube blank, applying pressure, controlling tube blank feeding by pushing heads at two sides of a cavity, and completely adhering the tube blank to a die under the combined action of the two parts to achieve the target size;
step 4: after unloading the pressure, moving an upper hydraulic forming die upwards, opening the die, and taking out the tube blank to obtain a bulging tube blank which meets the target size; cutting the top end of the bulging area of the tube blank after bulging according to the size requirement to obtain a part with flanging at two sides.
According to the forming method of the pipe fitting with the flanging at the two sides, the pipe fitting is expanded along the shape of the die by using a method of filling high-pressure liquid into the straight pipe fitting, the pipe fitting feeding is controlled by adopting the push heads at the two sides to adjust the stress state of the pipe fitting during deformation, the loading vertical to the axial direction of the pipe fitting is realized by controlling the movement of the die, the pipe fitting with the circular section, the flat pipe fitting or the special-shaped section is formed into the pipe fitting with the variable section, the obtained pipe fitting with the variable section and the large expansion rate is taken out, and the top end of the expansion area is cut off according to the size requirement to realize the forming of the pipe fitting with the flanging at the two sides finally.
In the step 1, the depth of an upper die cavity of an upper hydraulic forming die and the depth of a lower die cavity of a lower hydraulic forming die are half of the height of the section of a tube blank, positioning pin holes are formed in two sides of the upper die cavity, positioning pins corresponding to the positioning pin holes are formed in two sides of the lower die cavity, and mounting screw holes used for being connected with a hydraulic bulging machine are formed in the peripheries of the upper hydraulic forming die and the lower hydraulic forming die.
In the forming method of the pipe fitting with the flanging at the two sides, in the step 1, the whole diameter of the push head is equal to the outer diameter of the pipe blank, and the diameter of the front end of the push head corresponding to the pipe blank is smaller than the inner diameter of the pipe blank, so that the front end of the push head extends into the pipe blank, and the effect of pushing force on the pipe blank is realized; the inside liquid delivery hole that is equipped with of pushing away the head realizes the application of high pressure liquid, is equipped with the push away the head cover outside pushing away the head, pushes away the head cover inner chamber and pushes away the head and installs the sealing washer between the head and realize the tube blank sealedly.
In the step 1, an upper model cavity of an upper hydraulic forming die is uniformly provided with an upper model cavity variable section, a lower model cavity of a lower hydraulic forming die is provided with a lower model cavity variable section, the upper model cavity variable section corresponds to the lower model cavity variable section one by one, and a bulging zone with one die and multiple dies for flanging at two sides of the pipe is formed.
In the step 3, the relation between the push head movement and time, the relation between the internal pressure and time and the matching relation between the push head movement and time and the internal pressure and time are obtained by finite element simulation.
In the step 4, when the top end of the bulging area of the tube blank after bulging is cut off according to the size requirement, a simple tool is designed according to the size of the corresponding tube blank, and the cutting mode is linear cutting or laser cutting.
According to the forming method of the pipe fitting with the flanging at the two sides, when the flanging length is high and the pipe fitting cannot be formed by one-time bulging, after the pre-bulging is performed to a low height, the pre-bulging pipe blank is subjected to intermediate annealing treatment, and then the steps 1-4 are performed.
According to the forming method of the pipe fitting with the flanging at the two sides, the cutting area is changed according to the requirement, and the pipe fitting with the flanging at the single side is obtained; and changing the shape of the die according to requirements to obtain various pipe fittings with flanging on two sides of the special-shaped section.
According to the forming method of the pipe fitting with the flanging at the two sides, the shape of the die is designed according to the size of the specific pipe fitting, and a plurality of pipe fittings with flanging at the two sides are obtained through one-step forming.
The design idea of the invention is as follows:
according to the invention, the pipe reducer pipe with larger section deformation is formed by bulging through a pipe hydraulic forming process, then the top end of a bulging area is cut off according to the size requirement to form the pipe fitting with flanges at the two sides finally, the advantages of bulging with large expansion rate, high forming efficiency and high forming quality of the pipe are fully combined, a plurality of pipe fittings with flanges at the two sides can be formed at one time according to the process principle, and the forming difficulties such as flange cracking, poor surface quality, difficult flange of the pipe fitting with the special-shaped section and the like of the traditional pipe fitting flange forming process are overcome.
The invention has the advantages and beneficial effects that:
1. the cross section flanging deformation of the conventional pipe flanging technology is smaller, the pipe fitting with large expansion rate and variable diameter can be formed by adopting hydraulic forming, and then the pipe fitting with large flanging deformation can be obtained after the top end of the bulging area is cut off.
2. According to the invention, the flanging forming is obtained by adopting the hydraulic forming, and the flanging surface quality is better than that of the traditional flanging process.
3. The invention can realize simultaneous forming of one-die multi-piece and two-side flanging by adopting hydraulic forming, and has high forming efficiency.
4. The invention can realize the flanging forming of the two sides of various special-shaped cross-section pipe fittings by adopting the hydraulic forming, and the flanging of the special-shaped cross-section pipe fittings is difficult to realize by the traditional flanging process.
5. The forming method of the pipe fitting with the flanging at the two sides can form metal and alloy materials such as steel, aluminum, copper and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic view showing an initial state of hydroforming of a tube blank according to a first embodiment of the present invention.
Fig. 2 is a schematic view showing a hydraulic forming of a tube blank in a temporary state according to the first embodiment of the present invention.
Fig. 3 is a cross-sectional view showing the forming result of a tube blank hydroforming tube member and an area requiring cutting according to the first embodiment of the present invention.
Fig. 4 is a schematic view and a cross-sectional view of a final tube with flanges on both sides obtained after cutting according to the first embodiment of the present invention.
Fig. 5 is a three-dimensional view of the forming result of a flat tube hydroformed tube according to the second embodiment of the present invention and the area to be cut. Wherein, (a) is a front view, (b) is a top view, and (c) is a side view.
Fig. 6 is a schematic diagram and a cross-sectional view of a final flat tube with flanges on both sides obtained after cutting in the second embodiment of the present invention. Wherein, (a) is a front view, (b) is a top view, and (c) is a side view.
Fig. 7 is a schematic view of a final profiled cross-section tube with flanges on both sides according to embodiment three of the present invention.
Legend description:
1-1, hydroforming an upper die; 1-2, hydroforming a lower die; 1-3 parts of an upper model cavity reducing section, 1-4 parts of a lower model cavity reducing section; 2. pushing heads; 3. a high pressure liquid; 4. a tube blank; 4-1.1, a first round pipe fitting with flanging at two sides; 4-1.2, a second round pipe fitting with flanging at two sides; 4-1.3, a third round pipe fitting with flanging at two sides; 4-1.4, a fourth round pipe fitting with flanging at two sides; 4-2.1, a first two-side flat pipe fitting with flanging; 4-2.2, and the second two sides are provided with flanging flat pipe fittings.
Detailed Description
In the concrete implementation process, the invention provides a forming method of a pipe fitting with flanging at two sides, wherein the pipe fitting is expanded along the shape of a die by using a method of filling high-pressure liquid in a straight pipe fitting, the pipe fitting is controlled by adopting push heads at two sides to supplement materials to adjust the stress state of the pipe fitting during deformation and bending, the purpose of controlling the deformation height is achieved, meanwhile, the loading perpendicular to the axial direction of the pipe fitting can be realized by controlling the movement of the die, further, the forming of a special pipe comprising a flat pipe is achieved, and after the pipe fitting is completely expanded and stuck to the die, the top end of an expansion area is cut off according to the size requirement to realize the forming of the pipe fitting with flanging at two sides finally.
Embodiments of the invention will be described in detail below with reference to the attached drawing figures, in which the various cross-section tubes are only some, but not all embodiments of the invention, which can be practiced in a number of different ways, as defined and covered by the claims.
Embodiment one:
as shown in fig. 1-4, this embodiment provides a method for forming a pipe fitting with flanges on both sides, which uses a hydraulic bulging method to form a reducer pipe blank, uses two side push heads to control the pipe blank material supplementing, and matches with the pressure in the liquid to adjust the stress state of the pipe blank during deformation, so as to obtain a reducer pipe blank with a large expansion rate, and cuts the top end of the bulging area according to the size requirement to realize the final forming of the pipe fitting with flanges on both sides.
The method is realized by the following steps:
step 1: machining a hydroforming upper die 1-1, a hydroforming lower die 1-2 and a push head 2, and selecting a proper tube blank 4; the outer diameter of the tube blank 4 is equal to the diameter of a cavity formed by combining the upper hydraulic forming die 1-1 and the lower hydraulic forming die 1-2, and the lower die cavity of the lower hydraulic forming die 1-2 is in sliding fit with the tube blank 4.
The depth of the upper mould cavity of the upper hydroforming mould 1-1 and the depth of the lower mould cavity of the lower hydroforming mould 1-2 are half of the height of the section of the tube blank 4, positioning pin holes are formed in two sides of the upper mould cavity, positioning pins corresponding to the positioning pin holes are formed in two sides of the lower mould cavity, and mounting screw holes used for being connected with a hydraulic bulging machine are formed in the peripheries of the upper hydroforming mould and the lower hydroforming mould. The upper model cavity of the upper hydraulic forming die 1-1 is uniformly provided with an upper model cavity variable diameter section 1-3, the lower model cavity of the lower hydraulic forming die 1-2 is provided with a lower model cavity variable diameter section 1-4, and the upper model cavity variable diameter section 1-3 and the lower model cavity variable diameter section 1-4 are in one-to-one correspondence to form flanging bulging areas on two sides of a pipe fitting.
The whole diameter of the push head 2 is equal to the outer diameter of the tube blank 4, and the diameter of the front end of the push head 2 corresponding to the tube blank 4 is smaller than the inner diameter of the tube blank 4, so that the front end of the push head 2 extends into the tube blank 4, and the effect of applying pushing force to the tube blank 4 can be realized. The inside liquid delivery hole that is equipped with of push head 2 can realize the application of high pressure liquid 3, and the push head 2 outside is equipped with the push head cover, and the seal washer is installed to push head cover inner chamber and push head 2 between realize tube blank 4 sealed.
Step 2: the hydraulic forming lower die 1-2 is kept fixed, the tube blank 4 is placed in a lower die cavity of the hydraulic forming lower die 1-2, after the hydraulic forming upper die 1-1 and the hydraulic forming lower die 1-2 are clamped, the push heads 2 on the left side and the right side move to seal two ends of the tube blank (see figure 1);
step 3: starting a liquid filling part of a hydraulic bulging machine, filling high-pressure liquid 3 into the sealed tube blank 4 through pushing heads 2, applying high pressure, controlling tube blank feeding by the pushing heads 2 on two sides, and enabling the tube blank 4 to be completely stuck to a die (namely stuck to flanging bulging areas on two sides of a tube fitting combined with an upper model cavity variable-diameter section 1-3 and a lower model cavity variable-diameter section 1-4) under the combined action of the pushing heads 2, so that the tube blank reaches a target size (see figure 2);
step 4: after the pressure is unloaded, the hydroforming upper die 1-1 is moved upwards, the die is opened, the tube blank is taken out, and the bulging tube blank conforming to the target size is obtained (see fig. 3). Cutting the top end of the bulging area of the tube blank according to the size requirement after bulging, designing a simple tool according to the size of the corresponding tube fitting, and obtaining a typical tube fitting with flanging circular cross sections on two sides with more than one die by linear cutting or laser cutting: the first round pipe fitting with flanging 4-1.1 on two sides, the second round pipe fitting with flanging 4-1.2 on two sides, the third round pipe fitting with flanging 4-1.3 on two sides and the fourth round pipe fitting with flanging 4-1.4 on two sides (see figure 4).
Embodiment two:
as shown in fig. 5 to 6, in the present embodiment, the main forming step is the same as that of the first embodiment, except that:
the shape of the hydraulic bulging forming reducer pipe fitting is different, the first embodiment is a round section pipe fitting with flanges on two sides, the second embodiment is a flat pipe fitting with flanges on two sides, compared with the round section pipe fitting, the flat pipe fitting is easy to accumulate and wrinkle at the junction of the upper cambered surface and the lower cambered surface in the flanging process, and the forming is difficult in the traditional process. In the implementation of the step 1, the shape of a die cavity combined by the upper hydraulic forming die 1-1 and the lower hydraulic forming die 1-2 is the same as that of a finished tube blank, and the die cavity is flat; in step 3, the loading perpendicular to the axial direction of the tube blank is realized by controlling the die closing movement of the upper hydraulic forming die 1-1 and the lower hydraulic forming die 1-2, so that the tube blank material is compressed in the circumferential direction and is subjected to plastic deformation, and further, the flat tube blank after bulging, which meets the target size, is obtained (see fig. 5). Cutting off the top end of the bulging area according to the size requirement of the pipe blank to obtain a plurality of typical flat pipe fittings with flanges on two sides: the first two sides are provided with the flanging flat pipe fitting 4-2.1, and the second two sides are provided with the flanging flat pipe fitting 4-2.2 (see figure 6).
Embodiment III:
as shown in fig. 7, in the present embodiment, the main forming step is the same as that of the first embodiment, except that:
the shapes of the hydraulic bulging forming reducer pipe fittings are different, the first embodiment is a round section pipe fitting with flanges on two sides, the second embodiment is a flat pipe fitting with flanges on two sides, and the third embodiment is a special section pipe fitting with flanges on two sides. When the step 1 is implemented, the shape of a cavity combined by the upper hydraulic forming die 1-1 and the lower hydraulic forming die 1-2 is the same as that of a finished tube blank, and the die is a special-shaped section; in step 3, loading perpendicular to the axial direction of the pipe blank is achieved by controlling the die closing movement of the upper hydraulic forming die 1-1 and the lower hydraulic forming die 1-2, the pipe is compressed in the circumferential direction and is in contact with the forming dies 1-1 and 1-2, the cross section of the pipe is attached to the die under the action of internal pressure and axial compression in the die closing process, the circular shape is changed into the special-shaped cross section attached to the die, the forming of the pipe with the special-shaped cross section is achieved, and the pipe with the flanges on two sides is obtained (see fig. 7).
The implementation result shows that the method of the invention adopts a liquid filling bulging method, can realize the pipe fitting forming with flanges at both sides of various section shapes, and can change the die cavity according to actual needs to realize the flange forming at both sides of round pipes, flat pipes and various special-shaped pipe fittings. Meanwhile, the method can realize one-step forming of a plurality of pipe fittings with flanging at two sides, and has high forming efficiency.
Claims (10)
1. The forming method of the pipe fitting with the flanging at two sides is characterized by comprising the following steps of:
step 1: according to the shape of the needed formed product, designing and processing an upper hydraulic forming die, a lower hydraulic forming die and a push head, and selecting a proper tube blank size to be matched with the shape and the size of a cavity of the upper hydraulic forming die and the lower hydraulic forming die;
step 2: the hydraulic forming lower die is kept fixed, a tube blank is placed in a lower die cavity of the hydraulic forming lower die, the lower die cavity of the hydraulic forming lower die is in sliding fit with the tube blank, and after the hydraulic forming upper die and the hydraulic forming lower die are matched, push heads on the left side and the right side move to seal two ends of the tube blank;
step 3: starting a liquid filling part of a hydraulic bulging machine to fill high-pressure liquid into a sealed tube blank, applying pressure, controlling tube blank feeding by pushing heads at two sides of a cavity, and completely adhering the tube blank to a die under the combined action of the two parts to achieve the target size;
step 4: after unloading the pressure, moving an upper hydraulic forming die upwards, opening the die, and taking out the tube blank to obtain a bulging tube blank which meets the target size; cutting the top end of the bulging area of the tube blank after bulging according to the size requirement to obtain a part with flanging at two sides.
2. The method for forming a tube with flanging on both sides according to claim 1, characterized in that the method comprises the steps of expanding the tube blank along the shape of a die by filling high-pressure liquid into the straight tube blank, controlling the tube blank feeding by adopting the push heads on both sides to adjust the stress state of the tube blank during deformation, realizing loading perpendicular to the axial direction of the tube blank by controlling the movement of the die, realizing the forming of the tube blank with circular section, flat tube blank or special-shaped section into a tube blank with variable section, taking out the obtained tube blank with variable section and cutting off the top end of an expanding area according to the size requirement to realize the forming of the tube with flanging on both sides finally.
3. The method for forming a flanged pipe fitting on both sides according to claim 1, wherein in step 1, the depth of the upper mold cavity of the upper hydroforming mold and the depth of the lower mold cavity of the lower hydroforming mold are half of the height of the cross section of the pipe blank, positioning pin holes are formed on both sides of the upper mold cavity, positioning pins corresponding to the positioning pin holes are formed on both sides of the lower mold cavity, and mounting screw holes for connection with a hydro-bulging machine are formed on the peripheries of the upper hydroforming mold and the lower hydroforming mold.
4. The method for forming a tube with flanging on both sides according to claim 1, wherein in step 1, the overall diameter of the push head is equal to the outer diameter of the tube blank, and the diameter of the front end of the push head corresponding to the tube blank is smaller than the inner diameter of the tube blank, so that the front end of the push head extends into the tube blank to realize the action of pushing force on the tube blank; the inside liquid delivery hole that is equipped with of pushing away the head realizes the application of high pressure liquid, is equipped with the push away the head cover outside pushing away the head, pushes away the head cover inner chamber and pushes away the head and installs the sealing washer between the head and realize the tube blank sealedly.
5. The method for forming a flanged pipe fitting on two sides according to claim 1, wherein in step 1, an upper mold cavity of an upper hydroforming mold is uniformly provided with upper mold cavity variable section, a lower mold cavity of a lower hydroforming mold is provided with lower mold cavity variable section, the upper mold cavity variable section corresponds to the lower mold cavity variable section one by one, and bulging zones with more flanged edges on two sides of the pipe fitting are formed.
6. The method for forming a tube with burring on both sides according to claim 1, wherein in step 3, the relation between the movement of the push head and the time and the relation between the internal pressure and the time and the matching relation between the two are obtained by finite element simulation.
7. The method for forming a tube with flanging on both sides according to claim 1, wherein in step 4, when the top end of the bulging area is cut off according to the size requirement of the tube blank after bulging, a simple tool is designed according to the size of the corresponding tube, and the cutting mode is wire cutting or laser cutting.
8. The method of forming a tube with burring on both sides according to claim 1, wherein when the burring length is high, the preliminary bulging is used to form a lower height when the burring cannot be formed by one bulging, and then the preliminary bulging tube blank is subjected to an intermediate annealing treatment, and then steps 1 to 4 are performed.
9. The method for forming a tube with flanges on both sides according to claim 1, characterized in that the cutting area is changed according to the requirement to obtain a tube with flanges on one side; and changing the shape of the die according to requirements to obtain various pipe fittings with flanging on two sides of the special-shaped section.
10. The method for forming a double-sided flanged pipe fitting according to claim 1, wherein the mold shape is designed according to the specific pipe fitting size, and a plurality of double-sided flanged pipe fittings are obtained by one-time forming.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311284286.6A CN117463854A (en) | 2023-10-07 | 2023-10-07 | A forming method for pipe fittings with flanges on both sides |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311284286.6A CN117463854A (en) | 2023-10-07 | 2023-10-07 | A forming method for pipe fittings with flanges on both sides |
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| CN117463854A true CN117463854A (en) | 2024-01-30 |
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| CN202311284286.6A Pending CN117463854A (en) | 2023-10-07 | 2023-10-07 | A forming method for pipe fittings with flanges on both sides |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119327969A (en) * | 2024-10-11 | 2025-01-21 | 中南大学 | Electromagnetic driven hydraulic punching-flanging integrated forming device and processing method |
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2023
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| CN119327969A (en) * | 2024-10-11 | 2025-01-21 | 中南大学 | Electromagnetic driven hydraulic punching-flanging integrated forming device and processing method |
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