CN113996706B

CN113996706B - Electromagnetic composite forming method and device for Y-shaped pipe joint

Info

Publication number: CN113996706B
Application number: CN202111183073.5A
Authority: CN
Inventors: 黄尚宇; 欧冰; 刘维; 孟正华; 邓凌波
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-07-19
Anticipated expiration: 2041-10-11
Also published as: CN113996706A

Abstract

The invention discloses an electromagnetic composite forming method and a device for a Y-shaped pipe joint, which comprises a lower die, a lower die plate, an upper die, a blanking convex die, a supporting core and a press machine, wherein the bottom of the lower die is embedded in the lower die plate in a clamping way, a cylindrical hole is formed between the upper die and the lower die, a flanging hole is arranged at the top of the upper die, a blanking convex block is arranged at the bottom of the blanking male die and is arranged in the flanging hole, the top of the upper die is embedded in the upper die plate in a clamping manner, the support core is wound with a spiral pipe coil and is inserted in the cylindrical hole, two ends of the spiral pipe coil are externally connected with a charging and discharging circuit, a pipe is sleeved on the support core and is inserted in the cylindrical hole, the press machine is used for applying pressure to the upper die, the electromagnetic forming technology is adopted, the blanking male die is adopted to be attached to the pipe wall, under the action of electromagnetic force, the shape of the hole is punched, and the hole is turned over and attached to the flanging hole continuously under the action of residual electromagnetic force and inertial force to form the three-way pipe fitting.

Description

Electromagnetic composite forming method and device for Y-shaped pipe joint

Technical Field

The invention relates to the technical field of electromagnetic forming, in particular to an electromagnetic composite forming method and device for a Y-shaped pipe joint.

Background

In the field of aerospace, three-way pipes are widely applied, but the three-way pipes are difficult to form due to the difficulty in forming, the traditional process is difficult to form, a method for welding and forming a half-pipe three-way structure formed by stamping is adopted in the past, the machining process is complex, the precision of the pipe wall and the interface surface is not high, the corrosion resistance of a welding seam part is poor, turbulence is easily formed due to the unsmooth fillet, the stability of fluid conveying is finally influenced, and the traditional machining mode is difficult to meet higher requirements.

In order to avoid the limitation of traditional forming, at present, the integral forming technology is mostly adopted in China, such as internal high-pressure forming, high-pressure liquid is injected into a pipe to deform the pipe fitting and attach the pipe fitting to a mold, but the forming method has the problems of high equipment requirement, wrinkling and the like, a tee joint structure can be formed only by secondary cutting of a formed workpiece, the process is complex, and the quality of the formed workpiece is difficult to ensure.

Electromagnetic forming is a forming method for enabling a workpiece to deform at a high speed by utilizing electromagnetic force, has multiple advantages, is simple in forming tool, improves the forming limit of materials, reduces resilience and the like, and at present, electromagnetic flanging of a pipe fitting is mostly in a prefabricated hole mode, but in the flanging process, magnetic leakage exists, deformation unevenness caused by uneven stress can cause poor film sticking, and meanwhile, the prefabricated hole processing causes the process to be complicated.

Disclosure of Invention

According to the defects of the prior art, the invention aims to provide an electromagnetic compound forming method and device for a Y-shaped pipe joint.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the utility model provides a Y type pipe joint electromagnetism compound forming device which characterized in that: the punching die comprises a lower die, a lower die plate, an upper die, a punching male die, a supporting core and a press machine, wherein the bottom of the lower die is clamped in the lower die plate, a first semi-cylindrical hole is formed in the top of the lower die, the bottom of the upper die is matched with the top of the lower die, a second semi-cylindrical hole opposite to the first semi-cylindrical hole is formed in the bottom of the upper die, the first semi-cylindrical hole and the second semi-cylindrical hole form a cylindrical hole, a flanging hole which inclines at a certain angle with the axial direction of the second semi-cylindrical hole is formed in the top of the upper die, the flanging hole is communicated with the second semi-cylindrical hole, a punching convex block is arranged at the bottom of the punching male die, the punching convex block is arranged in the flanging hole, the top of the upper die is clamped in the upper die plate, the supporting core is inserted in the cylindrical hole, and a spiral pipe coil is wound on the supporting core, the spiral pipeline ring is coated with an insulating material, two ends of the spiral pipeline ring are externally connected with a charging and discharging circuit, a pipe is sleeved on the supporting core and inserted into the cylindrical hole, and the press machine is used for applying pressure to the upper template.

Furthermore, an annular cutting edge is arranged on the blanking convex block.

Furthermore, the bottom of the cutting edge presses the pipe, the middle of the cutting edge is spaced from the inner surface of the flanging hole by a certain distance, the edge of the cutting edge is sharp, and when the inclination angle of the flanging hole relative to the axial direction of the second semi-cylindrical hole is 90 degrees, the cross section of the cutting edge is oval; when the inclination angle of the flanging hole relative to the axial direction of the second semi-cylindrical hole is smaller than 90 degrees, the cross section of the cutting edge is in an irregular arc shape.

Furthermore, the outer side of the blanking lug is provided with a vent hole.

Furthermore, an observation through hole is formed in the top of the upper template and communicated with the flanging hole.

Further, both ends of the supporting core are provided with notches, and the charging and discharging circuit is connected with the spiral tube coil through an electric wire penetrating through the notches.

Furthermore, the charging and discharging circuit comprises a main circuit, a first branch and a second branch, a power supply, a protection resistor and a charging loop switch are arranged on the main circuit, a capacitor is arranged on the first branch, the spiral tube coil is arranged on the second branch, and a discharging loop switch is arranged on the second branch.

Further, bottom one side of going up the mould is equipped with first arch, top one side of lower mould be equipped with first protruding assorted is first sunken, the bottom opposite side of going up the mould is equipped with the second sunken, the top opposite side of lower mould be equipped with the sunken assorted second of second is protruding.

A Y-shaped pipe joint electromagnetic composite forming method is characterized by comprising the following steps:

step 1, embedding a lower die into a lower die plate for fixing, splicing the bottom of an upper die and the top of the lower die, enabling the positions of a first semi-cylindrical hole and a second semi-cylindrical hole to be opposite to each other to form a cylindrical hole, embedding a blanking male die into a flanging hole of the upper die, embedding the upper die at the bottom of an upper die plate, starting a press machine, enabling a punch of the press machine to press the upper die plate, and preventing all parts from moving;

step 2, winding a helical pipe coil on the support core, sleeving a pipe on the support core, inserting the pipe into the cylindrical hole, and adjusting the position of the helical pipe coil;

step 3, connecting the spiral pipe coil into a charging and discharging circuit, respectively connecting the upper and lower two poles of the spiral pipe coil with two ends of a capacitor, disconnecting a discharging loop switch, closing the charging loop switch, charging the capacitor, disconnecting the charging loop switch after the capacitor is fully charged, closing the discharging loop switch, and discharging the capacitor to enable the pipe to form a three-way pipe;

And 4, disconnecting the discharge circuit switch after the pipe fitting is formed, moving the punch of the press upwards, moving the upper die plate away, separating the upper die from the lower die, and taking out the pipe fitting.

A design method for the section profile of a blanking lug is characterized in that: the blanking lug is provided with an annular cutting edge, the edge of the cutting edge is sharp, and when the pipe fitting needs to be flanged without inclination, the cross section of the cutting edge is oval; when the pipe fitting needs the slope turn-ups, the cross section of blade is irregular arc, and the turn-ups slope that the pipe fitting needs is bigger, the cross sectional area of blade is littleer, and the cross section is flatter.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. according to the electromagnetic composite forming method and device for the Y-shaped pipe joint, the forming performance of materials is improved through electromagnetic force, the wall thickness uniformity is improved, the resilience is reduced, and the size precision of parts is improved.

2. According to the electromagnetic composite forming method and device for the Y-shaped pipe joint, the shearing effect is increased, the circuit is reduced, the flanging is prevented from cracking and the process is optimized through the special cutting edge structure.

3. According to the electromagnetic composite forming method and device for the Y-shaped pipe joint, complete pipes can be directly blanked and then flanged to obtain Y-shaped pipe parts at one time, prefabricated holes are not needed, the forming efficiency is greatly improved, the process is simplified, and the production cost is reduced.

Drawings

FIG. 1 is a longitudinal cross-sectional view of the composite forming apparatus of the present invention.

Fig. 2 is a front view of the composite forming apparatus of the present invention.

Fig. 3 is a cross-sectional view of the blanking punch of the present invention.

Fig. 4 is an isometric view of the blanking punch of the present invention.

Fig. 5 is a schematic view of the solenoid coil and support core of the present invention in combination.

FIG. 6 is a schematic structural view of the upper and lower templates of the present invention.

FIG. 7 is a schematic structural view of a Y-shaped pipe after the pipe of the present invention is formed.

FIG. 8 is a schematic structural view of another Y-shaped pipe after the pipe of the present invention is formed.

FIG. 9 is a schematic diagram of electromagnetic induction of a pipe formed in accordance with the present invention.

Figure 10 is a schematic view of the different cutting edges during the forming process of the present invention.

Wherein: 1. blanking a male die; 101. blanking the convex block; 102. cutting edges; 103. a vent hole; 2. mounting a template; 21. observing the through hole; 3. a helical tube coil; 4. a support core; 41. a notch; 5. a pipe fitting; 6. a lower template; 7. a lower die; 71. a first recess; 72. a second protrusion; 73. a first semicircular hole; 74. a third recess; 8. an upper die; 81. a first protrusion; 82. a second recess; 83. a second semicircular hole; 84. a third protrusion; 85. a disc-shaped recess; 86. flanging holes; 9. a protection resistor; 10. a power source; 11. a charging loop switch; 12. a capacitor; 13. and a discharge loop switch.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

An electromagnetic composite forming device for a Y-shaped pipe joint is disclosed, and is shown in figures 1-9, and comprises a lower die 7, a lower die plate 6, an upper die plate 2, an upper die 8, a blanking convex die 1, a supporting core 4 and a press machine, wherein the bottom of the lower die 7 is clamped in the lower die plate 6, the top of the lower die 7 is provided with a first semi-cylindrical hole 73, the bottom of the upper die 8 is matched with the top of the lower die 7, the bottom of the upper die 8 is provided with a second semi-cylindrical hole 83 opposite to the first semi-cylindrical hole 73, the first semi-cylindrical hole 73 and the second semi-cylindrical hole 83 form a cylindrical hole, the top of the upper die 8 is provided with a flanging hole 86 inclined at a certain angle with the axial direction of the second semi-cylindrical hole 83, the flanging hole 86 is communicated with the second semi-cylindrical hole 83, the bottom of the convex die blanking 1 is provided with the blanking convex block 101, the blanking convex block 101 is arranged in the flanging hole 86 and has a certain distance with the inner surface of the flanging hole 86, the top of the upper die 8 is clamped in the upper die plate 2, the support core 4 is inserted in the cylindrical hole, the spiral pipe coil 3 is wound on the support core 4, the spiral pipe coil 3 is coated with an insulating material, the two ends of the spiral pipe coil 3 are externally connected with a charge and discharge circuit, the pipe is sleeved on the support core 4 and inserted into the cylindrical hole, and the press machine is used for applying pressure to the upper die 8.

In the three-way pipe manufacturing process, establish the tubular product cover around being equipped with spiral pipe coil 3 support core 4 on and insert the cylinder hole, tubular product in the forming process, when spiral pipe coil 3 discharged, produced on the pipe fitting 5 to lorentz power all around, can have upwards and decurrent impact force to each mould, push down cope match-plate pattern 2 through the press, can prevent that each mould from beating, avoid influencing the shaping of three-way pipe.

To further prevent the individual dies from jumping, the bottom of the upper die 8 and the top of the lower die 7 engage, thereby limiting the relative movement between the upper die 8 and the lower die 7.

Referring to fig. 1, 6 and 9, after the charging and discharging circuit charges and discharges the solenoid coil 3, the solenoid coil 3 is energized, an induced current in a circumferential direction opposite to the solenoid coil 3 is generated on the pipe 5, a lorentz force repelling each other is generated between the pipe 5 and the solenoid coil 3, a local plastic deformation is generated at the flanging hole 86 of the upper die 8 under the action of an electromagnetic force, the pipe 5 punches a hole with a shape of a cross section of a punching bump under the impact of a punching male die, and is attached to the flanging hole 86 of the upper die 8 under the action of subsequent electromagnetic force and inertial force to complete final forming, and the shape of the hole is punched and is continuously flanged and attached to the upper die 8 under the action of the residual electromagnetic force and the inertial force.

Specifically, the upper template 2 and the lower template 6 are both rectangular plate-shaped structures, the upper die 8 and the lower die 7 are both rectangular block-shaped structures, and the upper template 2 and the lower template 6 are set to be rectangular plate-shaped structures, and the upper die 8 and the lower die 7 are set to be rectangular block-shaped structures, so that when the press applies pressure to the upper template 2, the pressure is uniform.

In general, the pipe fitting 5 without holes in the circumferential direction needs a strong current to form a three-way pipe, but the current is too strong to easily cause the flanging of the pipe to break, and in order to improve the blanking section and suppress the flanging from breaking, referring to fig. 3 and 4, an annular cutting edge 102 is arranged on the blanking convex block 101, the bottom of the cutting edge 102 presses the pipe, the middle part of the cutting edge 102 is spaced from the inner surface of the flanging hole 86 by a certain distance, the edge of the cutting edge 102 is sharp, and the cutting action can be enhanced through the cutting edge 102 to reduce the current.

Specifically, the cross section of the cutting edge 102 is an ellipse or an irregular arc, and as shown in fig. 8, when a hole without inclination is formed when there is no inclination burring, that is, when the inclination angle of the burring hole 86 with respect to the axial direction of the second semi-cylindrical hole 83 is 90 degrees, the cross section of the cutting edge 102 is an ellipse; referring to fig. 7, in the case of the beveled burring, when a beveled hole is formed, that is, when the angle of inclination of the burring hole 86 with respect to the axial direction of the second semi-cylindrical hole 83 is less than 90 degrees, the cross section of the cutting edge 102 has an irregular arc shape.

Blanking terrace die 1 is discoid structure, goes up the mould 8 top and is equipped with discoid recess 85 for blanking terrace die 1 can inlay card at last mould 8 top.

The blanking convex block 101 is provided with a vent 103 outside to prevent air from causing resistance to the forming process of the pipe 5.

The upper mold plate 2 is provided at the top thereof with an observation through-hole 21, and when the upper mold 8 is inserted into the upper mold plate 2, the observation through-hole 21 communicates with the burring hole 86.

Referring to the figure, in order to facilitate the pipe sleeve to be arranged on the supporting core 4 wound with the spiral pipe coil 3, the two ends of the supporting core 4 are provided with the notches 41, the charging and discharging circuit is shown by passing through 5, the electric wire of the notch 41 is connected with the spiral pipe coil 3, the forming of the pipe is not affected, and the supporting core 4 wound with the spiral pipe coil 3 can be conveniently drawn out after the pipe is formed.

Referring to fig. 1, the charging and discharging circuit includes a main circuit, a first branch and a second branch, the main circuit is provided with a power supply 10, a protection resistor 9 and a charging loop switch 11, the first branch is provided with a capacitor 12, the spiral coil 3 is provided on the second branch, and the second branch is provided with a discharging loop switch 13. The discharging loop switch 13 is opened, the charging loop switch 11 is closed, and the capacitor 12 is charged; when the capacitor 12 is fully charged, the charging loop switch 11 is switched off, the discharging loop switch 13 is switched on, and the capacitor 12 discharges electricity to the spiral pipe coil 3, so that the pipe forms a three-way pipe.

In order to prevent the upper mold 8 from moving relative to the lower mold 7, a first protrusion 81 (not shown) is provided on one side of the bottom of the upper mold 8, a first recess 71 (not shown) matching with the first protrusion 81 (not shown) is provided on one side of the top of the lower mold 7, a second recess 82 is provided on the other side of the bottom of the upper mold 8, and a second protrusion 72 matching with the second recess 82 is provided on the other side of the top of the lower mold 7.

In order to further prevent the upper mold 8 from moving relative to the lower mold 7, the first semicylindrical hole 73 is provided with third recesses 74 on both sides, the second semicylindrical hole 83 is provided with third protrusions 84 on both sides, and each third recess 74 is matched with one third protrusion 84.

An electromagnetic blanking and hole flanging composite forming method for a metal pipe fitting 5 is shown in reference to fig. 1-9:

step 1, embedding a lower die 7 into a lower die plate 6 for fixing, splicing the bottom of an upper die 8 and the top of the lower die 7 to enable the positions of a first semi-cylindrical hole 73 and a second semi-cylindrical hole 83 to be opposite to each other to form a cylindrical hole, embedding a blanking male die into a flanging hole 86 of the upper die 8, embedding the upper die 8 into the bottom of an upper die plate 2, starting a press machine, enabling a punch of the press machine to press the upper die plate 2, and preventing all parts from moving;

step 2, winding a spiral tube coil 3 on a support core 4, sleeving a pipe on the support core 4, inserting the pipe into the cylindrical hole, and adjusting the position of the spiral tube coil 3;

step 3, connecting the helical tube coil 3 into a charging and discharging circuit, respectively connecting the upper and lower poles of the helical tube coil 3 with two ends of a capacitor 12, disconnecting a discharging loop switch 13, closing the charging loop switch 11, charging the capacitor 12, after the capacitor is fully charged, disconnecting the charging loop switch 11, closing the discharging loop switch 13, and discharging and forming the capacitor 12;

And 4, after the pipe fitting 5 is formed, disconnecting the discharge circuit switch 13, moving the punch of the press upwards, moving the upper template 2 away, separating the upper die 8 and the lower die 7, and taking out the pipe fitting 5.

The invention also provides a design method of the section profile of the blanking convex block, which comprises the blanking convex block 101, wherein the blanking convex block 101 is provided with an annular cutting edge 102, the edge of the cutting edge 102 is sharp, and when the pipe fitting 5 needs to be flanged without inclination, the cross section of the cutting edge 102 is oval; when the pipe fitting 5 needs to be flanged with a slope, the cross section of the cutting edge 102 is in an irregular arc shape, the larger the flanging slope needed by the pipe fitting 5 is, the smaller the area of the cross section of the cutting edge 102 is, and the flatter the cross section is.

Referring to fig. 10, which is a schematic diagram of the cross section of the cutting edge 102 when the tube 5 requires the flanges with the slopes of 0 degree, 10 degrees and 20 degrees, respectively, for the flanges with the same length, the larger the slope of the flange required for the tube 5 is, the smaller the cross section area of the cutting edge 102 is, and the flatter the cross section is.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides a Y type pipe joint electromagnetism compound forming device which characterized in that: the blanking device comprises a lower die, a lower die plate, an upper die, a blanking convex die, a supporting core and a press machine, wherein the bottom of the lower die is embedded in the lower die plate in a clamping manner, a first semi-cylindrical hole is formed in the top of the lower die, the bottom of the upper die is matched with the top of the lower die, a second semi-cylindrical hole opposite to the first semi-cylindrical hole is formed in the bottom of the upper die, a cylindrical hole is formed in each of the first semi-cylindrical hole and the second semi-cylindrical hole, a flanging hole inclined by a certain angle with the axial direction of the second semi-cylindrical hole is formed in the top of the upper die, the flanging hole is communicated with the second semi-cylindrical hole, a blanking convex block is arranged at the bottom of the blanking convex die and is arranged in the flanging hole, an annular cutting edge is arranged on the blanking convex block, the bottom of the cutting edge presses a pipe, the middle of the cutting edge is spaced from the inner surface of the flanging hole by a certain distance, the edge of the edge is sharp, when the inclination angle of the flanging hole relative to the axial direction of the second semi-cylindrical hole is 90 degrees, the cross section of the cutting edge is oval; when the inclination angle of the flanging hole relative to the axial direction of the second semi-cylindrical hole is smaller than 90 degrees, the cross section of the cutting edge is in an irregular arc shape, for flanging with the same length, the inclination of the flanging needed by the pipe fitting is larger, the area of the cross section of the cutting edge is smaller, the cross section is flatter, the top of the upper die is embedded in the upper die plate in a clamping manner, one side of the bottom of the upper die is provided with a first bulge, one side of the top of the lower die is provided with a first recess matched with the first bulge, the other side of the bottom of the upper die is provided with a second recess, the other side of the top of the lower die is provided with a second bulge matched with the second recess, the two sides of the first semi-cylindrical hole are provided with third recesses, the two sides of the second semi-cylindrical hole are provided with third bulges, each third recess is matched with one third bulge, the support core is inserted into the cylindrical hole, a spiral pipe coil is wound on the support core, and an insulating material is wrapped on the spiral pipe coil, the two ends of the spiral pipe coil are externally connected with a charging and discharging circuit, the pipe is sleeved on the supporting core and inserted into the cylindrical hole, and the press machine is used for applying pressure to the upper template.

2. The electromagnetic composite forming device for the Y-shaped pipe joint as recited in claim 1, wherein: and air holes are formed in the outer sides of the blanking convex blocks.

3. The electromagnetic compound forming device for the Y-shaped pipe joint as recited in claim 1, wherein: and an observation through hole is formed in the top of the upper template and communicated with the flanging hole.

4. The electromagnetic composite forming device for the Y-shaped pipe joint as recited in claim 1, wherein: the both ends of support core all are equipped with the notch, charge-discharge circuit through passing the electric wire of notch with the spiral pipe coil links to each other.

5. The electromagnetic composite forming device for the Y-shaped pipe joint as recited in claim 1, wherein: the charging and discharging circuit comprises a main circuit, a first branch and a second branch, a power supply, a protective resistor and a charging loop switch are arranged on the main circuit, a capacitor is arranged on the first branch, a spiral tube coil is arranged on the second branch, and a discharging loop switch is arranged on the second branch.

6. A method for electromagnetically composite forming a Y-type pipe joint, using the apparatus for electromagnetically composite forming a Y-type pipe joint according to any one of claims 1 to 5, characterized in that:

Step 1, embedding a lower die into a lower die plate for fixing, splicing the bottom of an upper die and the top of the lower die to enable the positions of a first semi-cylindrical hole and a second semi-cylindrical hole to be opposite to each other to form a cylindrical hole, embedding a blanking male die into a flanging hole of the upper die, embedding the upper die at the bottom of an upper die plate, starting a press machine, enabling a punch of the press machine to press the upper die plate, and preventing all parts from moving;

step 3, connecting a spiral tube coil into a charging and discharging circuit, respectively connecting the upper pole and the lower pole of the spiral tube coil with two ends of a capacitor, disconnecting a discharging loop switch, closing the charging loop switch, charging the capacitor, disconnecting the charging loop switch after the capacitor is fully charged, closing the discharging loop switch, discharging the capacitor, and enabling the tube to form a three-way pipe;

and 4, disconnecting the discharge loop switch after the pipe fitting is formed, moving the punch of the press upwards, moving the upper die plate away, separating the upper die from the lower die, and taking out the pipe fitting.