CN111451354B - Electromagnetic-fluid impact composite forming device for pipe fitting and forming method thereof - Google Patents

Abstract

The invention discloses an electromagnetic-fluid impact composite forming device for a pipe fitting and a forming method thereof. The invention integrates the advantages of high precision of fluid forming, high speed of electromagnetic forming and easy arrangement of coils according to deformation requirements, and can realize high-precision deformation of difficult-deformation areas of difficult-deformation materials (such as aluminum alloy, magnesium alloy, titanium alloy and the like).

Description

Electromagnetic-fluid impact composite forming device for pipe fittings and forming method thereof

technical field

The invention relates to the technical field of material processing and forming, in particular to an electromagnetic-fluid impact composite forming device for pipe fittings and a forming method thereof.

Background technique

The fluid forming technology of pipe fittings usually uses the tube blank as the raw material, and by applying fluid pressure to the tube cavity, it undergoes plastic deformation in a given mold cavity, and the tube wall is attached to the inner surface of the mold to obtain the desired shape parts. Technology. Compared with traditional forming, fluid forming parts have good surface quality and high dimensional accuracy, and are now widely used in the forming of parts in the fields of automobiles, aviation and aerospace. However, the fluid forming speed is slow and it is a low-rate forming method. In addition, during the forming process, the fluid force received by different areas of the pipe fitting is evenly distributed, and it is not easy to adjust the force distribution of the different areas of the pipe fitting according to the needs of deformation.

Electromagnetic forming technology is a high-speed, high-energy rate, short-time pulse processing technology that utilizes the electromagnetic force of metal in a strong pulsed magnetic field to cause plastic deformation. Studies have shown that the material can obtain higher formability than traditional stamping under high-speed deformation conditions, and this phenomenon of higher formability is called "high plasticity". Under the high-speed impact, the material produces a quasi-static deformation behavior different from the traditional processing method, and a dynamic behavior occurs, that is, the material appears under the impact of deformation elastic waves and plastic waves. Behavior. Therefore, the forming limit of the hard-to-deform material can be effectively improved, and the springback can be reduced. However, in traditional electromagnetic forming, the deformation speed of pipe fittings under the action of electromagnetic force is too fast, which makes it difficult to control the forming process and achieve precise shape control of parts.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an electromagnetic-fluid impact composite forming device for pipe fittings and a forming method thereof, so as to solve the above problems.

In order to achieve the above object, the present invention firstly discloses an electromagnetic-fluid impact composite forming device for pipe fittings, comprising a mold, wherein a forming hole for fitting the pipe fitting is provided in the mold, and a side wall of the forming hole is provided. A forming cavity is arranged on the upper part, a bulging coil is arranged in the forming hole for being installed in the pipe and opposite to the forming cavity, and at least one side of the forming hole is detachably provided with a sealing ring for sealing the forming hole. A sealing element is provided with a fluid injection hole for injecting fluid into the forming hole.

Further, it also includes a coil support and a coaxial support frame, the bulging coil is circumferentially installed on the coil support, and the coil support is installed on the coaxial support frame so that the bulging coil and the The fittings are arranged coaxially.

Further, the coaxial support frame includes support blocks installed on both sides of the coil support, the support blocks are coaxially inserted into the pipe fittings, and the support blocks are provided with fluid channels for fluid to pass through. .

Further, the sealing member includes a first push block and a second push block made of metal, the first push block and the second push block are respectively sealed and slidably connected to both ends of the forming hole, and the first push block and the second push block are respectively sealed and slid. A side push coil is arranged on the outside of the block and the second push block.

Further, the fluid is liquid or gas.

Further, the first push block and/or the second push block include a conductive layer close to the side push coil and a molding layer close to the fluid, the conductivity of the conductive layer is greater than that of the molding layer, and the The strength of the conductive layer is less than that of the shaping layer.

Further, the conductive layer is a pure copper layer or a pure aluminum layer, and the forming layer is a metal iron layer or an aluminum alloy layer.

Further, it also includes a bulging coil discharge circuit for discharging the bulging coil, and the wire seal of the bulging coil discharge circuit is connected to the bulging coil through the first push block and/or the second push block .

Then, the present invention discloses an electromagnetic-fluid impact composite forming method for pipe fittings, including the electromagnetic forming device for fluid impact sheet metal forming described in the above scheme, including the following steps:

S1, placing the pipe into the forming hole;

S2, installing the control bulging coil into the pipe fitting in the forming hole, and controlling the discharge forming of the bulging coil;

S3, sealing the forming hole, and injecting fluid to fill the pipe with fluid;

S4, applying a quasi-static fluid force to the pipe fitting through the fluid injection hole, so that the pipe fitting is in contact with the wall surface of the forming cavity.

Then, the present invention discloses an electromagnetic-fluid impact composite forming method for pipe fittings, including the electromagnetic forming device for fluid impact sheet metal forming described in the above scheme, including the following steps:

S1. Place the pipe in the forming hole containing the fluid;

S2. Control the bulging coil and the side push coil to apply electromagnetic force at the same time, the bulge coil drives the pipe to deform at a high rate, and the side push coil drives the first push block and/or the second push block to squeeze the fluid to drive High-speed deformation of pipe fittings.

Compared with the prior art, the advantages of the present invention are:

1. When the present invention adopts the method of first coil discharge, and then quasi-static fluid shape correction. The coil discharge first deforms the difficult-to-deform area of traditional fluid forming, and then controls the shape of the formed part through fluid forming. Therefore, the present invention combines the advantages of high precision of fluid forming, high speed of electromagnetic forming, and easy setting of coils according to the needs of deformation, and can achieve high precision in the difficult deformation area of difficult-to-deform materials (such as aluminum alloys, magnesium alloys, titanium alloys, etc.). deformed.

2. When the present invention adopts the method of simultaneously driving the deformation of the pipe fittings by coil discharge and high-speed fluid, the overall high-speed deformation of the pipe fittings is realized. It can greatly improve the forming limit and forming efficiency of the material.

The present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of the initial stage of discharge of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in Embodiment 1 of the present invention;

2 is a schematic diagram of the deformation of the pipe fitting when the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in the first embodiment of the present invention is discharged;

FIG. 3 is a schematic diagram of a fluid correction pipe fitting of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in Embodiment 1 of the present invention;

4 is a schematic diagram of the deformation result of the pipe fitting of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in the first embodiment of the present invention;

5 is a schematic diagram of the installation of the coil support and the coaxial support frame of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in the first embodiment of the present invention;

6 is a schematic diagram of the electrical initial stage of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in Embodiment 2 of the present invention;

FIG. 7 is a schematic diagram of the deformation result of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in Embodiment 2 of the present invention acting on the pipe fittings synchronously by electromagnetic and fluid;

8 is a schematic structural diagram of a first push block and a second push block of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in Embodiment 2 of the present invention;

FIG. 9 is a schematic diagram of circuit connection of the electromagnetic-fluid impact composite forming device for pipe fittings disclosed in the second embodiment of the present invention.

illustration:

1. Mould; 2. Pipe fittings; 3. Bulging coil; 4. Coil support; 5. First push block; 51, Conductive layer; 52, Forming layer; 6, Second push block; 7, Fluid; 8, Fluid Injection hole; 9, side push coil; 10, forming hole; 11, forming cavity; 12, coaxial support frame; 13, fluid channel; 14, support block; 15, air hole.

Detailed ways

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

Example 1:

As shown in FIGS. 1-5 , the embodiment of the present invention firstly discloses an electromagnetic-fluid impact composite forming device for pipe fittings, including a mold 1, and a forming hole 10 that can fit the outer wall of the pipe fitting 2 is provided in the mold 1. The forming hole The side wall of 10 is provided with a forming cavity 11. During the forming process, the inner side wall of the pipe fitting 2 will receive electromagnetic force to expand outward, and finally fit with the bottom surface of the forming cavity 11, and the forming cavity 11 is provided with an air hole penetrating outward. 15. Exhaust when the pipe wall is expanded outward by electromagnetic force. The forming hole 10 is provided with a bulging coil 3 that is installed in the pipe fitting 2 and is opposite to the forming cavity 11. The bulging coil 3 is an electromagnetic forming coil. At least one side of the forming hole 10 is detachably provided with a sealing member for sealing the forming hole 10, that is, the forming hole 10 can be in the form of a counterbore or a through hole, and the sealing member is provided with a sealing member for sealing the forming hole 10. The fluid injection hole 8 into which the fluid 7 is injected. Specifically, the fluid 7 can be a liquid, such as water or hydraulic oil, or a gas, such as high and low temperature air. In this embodiment, the fluid 7 is a liquid.

In this embodiment, a coil support 4 is also included. The bulging coil 3 is circumferentially installed on the coil support 4. The power transmission line of the bulging coil 3 is connected to the external bulging coil discharge circuit from the inside of the pipe fitting 2 through the sealing member. The coil support 4 is installed in the air to ensure the coaxial installation of the bulging coil 3 and the pipe fitting 2, so as to facilitate the uniform forming of the pipe fitting 2. The coil support 4 is installed on a coaxial support frame 12, and the coaxial support frame 12 includes a fixed connection on the coil. The cylindrical support blocks 14 on both sides of the bracket 4 are seamlessly slidable with the inner hole of the pipe fitting 2. During installation, the coaxial support frame 12 is directly pushed into the pipe fitting 2 to a fixed position. At the same time, in order to ensure the fluid 7 The support block 14 flows to the left and right to transmit the pressure. The support block 14 is also provided with a fluid channel 13 . The fluid channel 13 can also be a through hole that penetrates the support block 14 in the circumferential direction, or can be grooved on the outer edge of the support block 14 set up.

In the specific forming process, the bulging coil 3 is first used to discharge the local area of the pipe fitting 2, so that the local area of the pipe fitting 2 (the hard-to-deform area of fluid forming) is deformed first, and the peripheral area of the local area is under the action of the drag force. deformed. Then, the tube 2 is placed in the mold 1 containing the fluid 7 , and a fluid force is applied to the forming hole 10 through the fluid injection hole 8 to make the tube 2 fully fit the bottom surface of the forming cavity 11 .

Embodiment 2:

As shown in FIGS. 6-9 , the electromagnetic-fluid impact composite forming device for pipe fittings according to the embodiment of the present invention is basically the same as that of the first embodiment, except that the sealing member includes a first push block 5 and a first push block 5 made of metal. Two push blocks 6, the first push block 5 and the second push block 6 are sealed and slid on both ends of the forming hole 10 respectively, and a side push coil 9 is provided on the outer side of at least one of the first push block and the second push block 6 , in this embodiment, the outer side of the first push block 5 and the second push block 6 are provided with a side push coil 9, and the side push coil 9 is an electromagnetic forming coil, so that when the fluid injection hole 8 is injected with fluid, it can be sealed It is provided that the fluid 7 is squeezed by the pressure acting on the first push block 5 and the second push block 6 by the side push coil 9, thereby driving the tube 2 to deform at a high speed.

Specifically, the first push block 5 and the second push block 6 include a shaped conductive layer 51 close to the side push coil 9 and a shaped layer 52 close to the fluid 7 . The strength is lower than that of the forming layer 52, so as to ensure that a large electromagnetic force is formed on the first push block 5 and the second push block 6, and the conductive layer 51 is a pure copper layer or a pure aluminum layer, which is soft in texture but large in electrical conductivity. Larger electromagnetic force can be formed. The forming layer 52 is a metal iron layer or an aluminum alloy layer, with relatively low electrical conductivity, but hard texture and high strength, which is difficult to deform, so as to avoid fluid leakage due to deformation. At the same time, the strength of the entire first push block 5 and the second push block 6 is also improved to prevent deformation.

In the specific forming process, the bulging coil 3 and the side push coil 9 are respectively set, and the side push coil 9 drives the first push block 5 and the second push block 6 to squeeze the fluid to impact the pipe fitting 2 at a high speed, so that the pipe fitting 2 is under the electromagnetic force. High-precision and rapid deformation occurs under the joint action of high-speed fluid.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. An electromagnetic-fluid impact composite forming device for pipe fittings, comprising a mold (1), characterized in that the mold (1) is provided with a forming hole (10) that can fit the pipe fitting (2) A forming cavity (11) is provided on the side wall of the forming hole (10), and a bulging cavity (11) for being installed in the pipe (2) and opposite to the forming cavity (11) is arranged in the forming hole (10). The forming coil (3), at least one side of the forming hole (10) is detachably provided with a sealing member for sealing the forming hole (10), and a sealing member for sealing the forming hole (10) is provided on the sealing member. ) into the fluid injection hole (8) for injecting the fluid (7), further comprising a coil support (4) and a coaxial support frame (12), the bulging coil (3) is circumferentially mounted on the coil support (4) On the upper side, the coil support (4) is mounted on the coaxial support frame (12) so that the bulging coil (3) is coaxially arranged with the pipe (2), and the coaxial support frame (12) ) comprises support blocks (14) installed on both sides of the coil support (4), the support blocks (14) are coaxially plugged into the pipe fitting (2), and the support blocks (14) are provided with There is a fluid channel (13) for the fluid (7) to pass through; the seal includes a first push block (5) and a second push block made of metal, and the first push block (5) and the second push block are respectively The seals are slidably connected to both ends of the forming hole (10), and side push coils (9) are provided on the outer sides of the first push block (5) and the second push block. 2 . The electromagnetic-fluid impact composite forming device for pipe fittings according to claim 1 , wherein the fluid ( 7 ) is liquid or gas. 3 . 3. The electromagnetic-fluid impact composite forming device for pipe fittings according to claim 1, characterized in that the first push block (5) and/or the second push block comprise a coil (9) close to the side pusher ) and a shaping layer (52) close to the fluid (7), the electrical conductivity of the electrically conductive layer (51) is greater than that of the shaping layer (52), and the strength of the electrically conductive layer (51) smaller than the shaping layer (52). 4 . The electromagnetic-fluid impact composite forming device for pipe fittings according to claim 3 , wherein the conductive layer ( 51 ) is a pure copper layer or a pure aluminum layer, and the forming layer ( 52 ) is a metal layer. 5 . Iron layer or aluminum alloy layer. 5. The electromagnetic-fluid impact composite forming device for pipe fittings according to claim 1, characterized in that further comprising a bulging coil discharge circuit for discharging said bulging coil (3), said bulging coil discharging The wire seal of the circuit is connected to the bulging coil (3) through the first push block (5) and/or the second push block. 6. An electromagnetic-fluid impact composite forming method for pipe fittings, comprising the electromagnetic-fluid impact composite forming device for pipe fittings according to any one of claims 1-5, characterized in that, comprising the steps of: S1, placing the pipe fitting (2) into the forming hole (10); S2. Install the bulging coil (3) into the pipe fitting (2) in the forming hole (10), and control the bulging coil (3) to discharge and form; S3, sealing the forming hole (10), and injecting the fluid (7) to fill the pipe (2) with the fluid (7); S4, applying quasi-static fluid force to the pipe fitting (2) through the fluid injection hole (8), so that the pipe fitting (2) is in contact with the wall surface of the forming cavity (11). 7. An electromagnetic-fluid impact composite forming method for pipe fittings, comprising the electromagnetic-fluid impact composite forming device for pipe fittings according to any one of claims 1-5, characterized in that, comprising the steps of: S1, placing the pipe (2) in the forming hole (10) containing the fluid (7); S2. Control the bulging coil (3) and the side push coil (9) to apply electromagnetic force at the same time, the bulge coil (3) drives the pipe (2) to deform at a high rate, and the side push coil (9) drives The first push block (5) and/or the second push block squeeze the fluid (7) to drive the tube (2) to deform at high speed.

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