CN211413299U

CN211413299U - Local characteristic electromagnetic forming device for automobile covering part

Info

Publication number: CN211413299U
Application number: CN201921990041.4U
Authority: CN
Inventors: 柳泉潇潇
Original assignee: Changsha Jinbang Electromechanical Equipment Co Ltd
Current assignee: Huaxun Shenzhen Intelligent Equipment Co ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-09-04
Anticipated expiration: 2029-11-18

Abstract

The utility model relates to an electromagnetic forming device for local characteristics of automobile covering parts, wherein a forming coil and a charging and discharging circuit form a pulse generating device; the lower part of the coil core is placed in the lower base, the upper part of the coil core is wound by a lead to form a formed coil, and the periphery of the formed coil is wrapped by insulating resin; the forming female die is rigidly connected with the upper gland; the plate is placed on the upper part of the coil ring seat and is connected with the coil ring seat through the upper gland to fix the periphery of the plate; the coil ring seat is placed above the lower base, a coil core and a formed coil wrapped by insulating resin are placed in an inner hole of the coil ring seat, and the coil ring seat is rigidly connected with the lower base; the coil core wrapped by insulating resin and the upper part of the formed coil are of a boss structure, a coil pressing ring is additionally arranged in the coil ring seat and pressed at the shaft shoulder positions of the boss structures on the coil core and the upper part of the formed coil, and the coil pressing ring is rigidly connected with the coil ring seat. The utility model discloses have good subsides mould nature, can improve the deep-drawing degree of knocker hand and improve the shaping efficiency of plate.

Description

Local characteristic electromagnetic forming device for automobile covering part

Technical Field

The utility model relates to a metal forming manufacturing technical field especially relates to an automobile panel local characteristic electromagnetic forming device.

Background

In order to protect the environment and reduce pollution, the light weight of automobiles and the popularization of electric automobiles become trends, and the adoption of light alloys such as aluminum alloy and the like is a main approach in the process of realizing the light weight of automobiles.

The automobile body covering piece is one of main scenes that aluminum alloy is applied to an automobile, the whole characteristic of the automobile 'four-door two-cover' covering piece is simple, the stamping forming difficulty is low, but the stretching treatment is needed when the local characteristic of a similar automobile door handle is formed, and cracks are easy to appear in the traditional stamping forming process. Researches show that the aluminum alloy automobile door panel door buckle is difficult to realize good processing on the basis of the traditional stamping process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the technical problem that prior art exists, provide an automobile panel local characteristic electromagnetic forming device, its limitation that can overcome traditional stamping technology, it has good subsides mould nature, can improve the deep-drawing degree of knocker hand and improve the shaping efficiency of plate.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides an automobile panel local characteristic electromagnetic forming device, it includes:

the coil forming device comprises an upper gland, a forming female die, insulating resin, a forming coil, a coil core, a coil pressure ring, a coil ring seat, a lower base and a charging and discharging circuit;

the forming coil and the charging and discharging circuit form a pulse generating device;

the lower part of the coil core is placed in the lower base, the upper part of the coil core is wound by a lead to form the formed coil, and the insulating resin is wrapped on the upper parts of the formed coil and the coil core and the periphery of the formed coil;

the forming female die is rigidly connected with the upper gland; the plate is placed on the upper part of the coil ring seat, and the periphery of the plate is fixedly connected with the coil ring seat through the upper gland;

the coil ring seat is placed above the lower base, the coil core and the formed coil wrapped by the insulating resin are placed in an inner hole of the coil ring seat, and the coil ring seat is rigidly connected with the lower base;

the coil core wrapped by the insulating resin and the upper part of the forming coil are of a boss structure, the coil ring seat is internally and additionally provided with the coil pressing ring, the coil core and the boss structure on the upper part of the forming coil are arranged at the shaft shoulder position, and the coil pressing ring is rigidly connected with the coil ring seat.

More preferably, the electromagnetic forming apparatus further comprises: the cushion blocks are placed above four corners of the lower base;

the coil ring seat is pressed on the upper portion of the cushion block, and the coil ring seat is rigidly connected with the cushion block and the lower base.

More preferably, the charge and discharge circuit includes:

the device comprises a discharge switch, a charge switch, an alternating current power supply and a capacitor bank;

the charging switch and the alternating current power supply are connected in series to form a branch circuit, and two ends of the branch circuit form a loop with the inner ring and the outer ring of the forming coil through circuits respectively; the discharge switch is connected with the branch circuit in series; the capacitor bank is connected in parallel with the branch.

More preferably, the die surface of the forming female die is a die surface matched with the local characteristic shape of the automobile covering part.

More preferably, the molding surface of the molding cavity is provided with air holes for exhausting air.

More preferably, the wire is a copper wire.

By the above-mentioned the technical scheme of the utility model can see out, the utility model discloses following technological effect has:

the utility model discloses a discharge switch, the switch that charges, alternating current power supply, capacitor bank and forming coil constitute pulse generator, through discharging, produce powerful pulse current in forming coil, produce the vortex opposite with forming coil pulse current on the panel this moment, meanwhile forming coil produces pulsed magnetic field around it, under the effect of electromagnetic force, treat that the panel that takes shape takes place high-speed deformation near forming coil department, thereby make panel paste the shaping die fast and accomplish panel shaping, it can fully improve panel forming ability and shaping efficiency to see to utilize electromagnetism high speed.

Drawings

FIG. 1 is a schematic diagram of an electromagnetic high-rate forming die;

FIG. 2 is a schematic diagram of a configuration of a shaped coil;

FIG. 3 is a front view of the forming die;

FIG. 4 is a top view of the forming die;

FIG. 5 is a right side view of the forming die;

in the drawings:

1-upper gland, 2-forming female die, 3-insulating resin, 4-plate, 5-forming coil, 6-coil core, 7-coil compression ring, 8-coil ring seat, 9-cushion block, 10-lower base, 11-discharge switch, 12-charging switch, 13-alternating current power supply and 14-capacitor bank.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present application, the present invention will be further described in detail with reference to the accompanying drawings.

The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.

The utility model discloses in, belong to "installation", "link to each other", "meet", "connect", "fixed" etc. and should do the broad sense and understand, for example, can be fixed connection, also can dismantle the connection, also can connect integratively, also can be mechanical connection, also can be the electricity and connect or can intercommunicate, also can be the lug connection, also can be through intermediate medium indirect connection, can be the inside UNICOM of two components and parts, also can be the interactive relation of two components and parts. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example (b):

the utility model provides an automobile panel local characteristic electromagnetic forming device, its structure is as shown in figure 1, include: the coil forming device comprises an upper gland 1, a forming female die 2, insulating resin 3, a plate 4, a formed coil 5, a coil core 6, a coil compression ring 7, a coil ring seat 8, a cushion block 9, a lower base 10, a discharge switch 11, a charging switch 12, an alternating current power supply 13 and a capacitor bank 14.

The shaped coil 5 is a powered core component, and the shaped coil 5 is formed of copper wire wound around a coil core 6 (e.g., insulated wood) and shaped as shown in fig. 2 according to the shape of a local feature of the automobile panel (e.g., a door handle), which facilitates the shaping of the panel. In order to integrate the formed coil 5 and the coil core 6, the insulating resin 3 is wrapped around the formed coil 5 and the coil core 6 and on the formed coil 5. After the insulating resin 3 is solidified, a desired shape is cut out.

The coil core 6 includes three portions, an upper portion, a middle portion, and a lower portion, each of which has a smaller outer diameter than the middle portion. The upper part is used for winding copper wire to form a shaped coil 5, and the lower part is slightly smaller than the through hole of the lower base 10, so that the coil core 6 is placed in the lower base 10.

The coil ring seat 8 is placed above the lower base 10, and the coil ring seat 8 is rigidly connected with the lower base 10.

In order to conveniently adjust the gap between the coil ring seat 8 and the lower base 10, cushion blocks 9 can be arranged above four corners of the lower base 10; the coil ring seat 8 is pressed on the upper part of the cushion block 9. The coil ring seat 8 is rigidly connected with the cushion block 9 and the lower base 10.

A coil core 6 and a formed coil 5, which are wrapped with an insulating resin 3, are placed in an inner hole of a coil ring holder 8. The inner bore may be a counterbore as shown in fig. 1 or may be a through bore. The coil ring seat 8 serves to fix the planar movement of the coil core 6 and the shaped coil 5.

The coil core 6 wrapped by the insulating resin 3 and the upper part of the formed coil 5 are in a boss structure. A coil compression ring 7 is additionally arranged in the coil ring seat 8 and pressed on the shaft shoulder parts of the boss structures on the upper parts of the coil core 6 and the formed coil 5 so as to limit the axial movement of the coil core 6 and the formed coil 5; the coil pressing ring 7 is rigidly connected with the coil ring seat 8.

The plate 4 is placed on the upper part of the coil ring seat 8. The upper gland 1 is rigidly connected with the coil ring seat 8 and is used for fixing the periphery of the plate 4.

The forming female die 2 is a female die formed in electromagnetic forming and is rigidly connected with the upper gland 1. The structure is shown in fig. 3 to 5, the die surface of the female die is matched with the shape of local characteristics (such as an automobile door handle) of an automobile covering part, so that the plate 4 is favorably and tightly attached to the forming female die 2; in order to prevent the influence of air on deformation when the sheet material is deformed at a high speed, four air holes are formed on the die surface of the forming female die 2. The vent facilitates venting due to gas generation at high speed operation.

The discharge switch 11, the charge switch 12, the alternating current power supply 13 and the capacitor bank 14 form a charge-discharge circuit. The charging switch 12 and the alternating current power supply 13 are connected in series to form a branch circuit, and two ends of the branch circuit form a loop circuit with the inner ring and the outer ring of the forming coil 5 through circuits respectively; the discharge switch 11 is connected in series with the branch; a capacitor bank 14 is connected in parallel with the branch. The charging and discharging circuit and the forming coil 5 form a pulse generating device, the coil pressing ring 7 presses the plate to be formed on the forming female die 2, and the forming female die 2 is arranged on an electromagnetic forming device so as to electromagnetically form the plate 4 at a high speed.

A strong pulse current is generated in the forming coil 5 by the electric discharge, and at this time, an eddy current opposite to the pulse current of the forming coil 5 is generated in the sheet material 4, and at the same time, the forming coil 5 generates a pulse magnetic field around the sheet material. Under the action of electromagnetic force, the plate 4 to be formed is deformed at a high speed at a position close to the coil, so that the plate 4 is quickly attached to a die; and taking down the plate 4 after the high-speed deformation, and carrying out annealing heat treatment, thereby completing the forming process of the plate.

The utility model discloses an assembly process specifically as follows:

a copper wire is first wound around a coil core 6 (e.g., insulation wood) to form a shaped coil 5 as shown in fig. 2.

The insulating resin 3 is wrapped around the formed coil 5 and the coil core 6 so that the formed coil 5 and the coil core 6 are integrated, and after the resin is solidified, a desired shape is cut out.

Placing the coil core 6 in the lower base 10; the coil ring seat 8 is pressed on the upper part of the cushion block 9 and is used for fixing the planar motion of the coil core 6 and the forming coil 5; and a coil compression ring 7 is additionally arranged and used for fixing the axial movement of the coil core 6 and the formed coil 5, the forming female die 2 is rigidly connected with the upper gland 1, and the upper gland 1 is rigidly connected with the coil ring seat 8 and used for fixing the periphery of the plate 4.

And placing the plate to be formed between the forming female die 2 and the coil ring seat 8, performing corresponding positioning treatment, and setting a reasonable blank holder force.

Before discharging, the charging switch 12 is closed, and the capacitor bank 14 is charged by the alternating current power supply 13 to reach a sufficient voltage; under the control of a computer, the discharge switch 11 is triggered to be closed, the loop is conducted, the pulse energy storage capacitor bank 14 discharges the forming coil 5 quickly, high-voltage strong pulse current is generated on the forming coil 5, and therefore a strong pulse magnetic field is generated around the forming coil 5. The sheet 4 generates eddy currents under the action of the magnetic field, thereby generating a strong pulsed electromagnetic force between the sheet 4 and the forming coil 5. When the electromagnetic force exceeds the yield limit of the plate 4, the plate 4 can be quickly deformed, the time of the action of the electromagnetic force is short, after the action of the electromagnetic force is finished, the plate 4 to be formed continues to move under the action of the inertial force until the movement speed of the plate 4 becomes zero, and the plate 4 can be attached to the forming female die 2, so that the die attaching process of the plate 4 is completed.

The dimensions of the above-mentioned shaped coil 5 are obtained: the best inductance in the electromagnetic forming process can improve the energy utilization rate of equipment and enable the deformation of the plate to be more sufficient. The optimum inductance of the coil is different due to the different electrical conductivity and thickness of the different sheets. The idea is to design parameters such as corresponding coil turns, sectional area, turn spacing and the like by calculating the optimal inductance of a given plate and taking the optimal inductance as an optimization target.

The magnetic field force magnitude calculation method comprises the following steps:

first, the optimum inductance of the shaped coil 5 is calculated using the following formula:

wherein, mu₀Is a vacuum magnetic conductivity; x is the conductivity of the plate to be formed; the thickness of the plate to be formed; c is the capacitance of the electromagnetic forming equipment; l is the inductance of the electromagnetic forming apparatus.

The inductance of the formed coil a can be obtained by the above formula, and the number of turns, the turn pitch, and the cross-sectional area of the coil are designed based on the optimum inductance of the formed coil.

The formula for the calculation of the electromagnetic force F is as follows:

F＝J×B

wherein J is the current density and has the unit of (A/m)²) (ii) a B is the magnetic induction intensity, and the unit is (T).

The electromagnetic force applied to the plate 4 can be influenced by the current density and the magnetic induction intensity at the plate by the formula, so that the electromagnetic force at the position of the plate 4 can be controlled by adjusting the size of the cross section of the coil, and the plate has better die attaching performance.

The forming coil generates strong pulse electromagnetic force between the plate and the forming coil, and when the electromagnetic force exceeds the yield limit of the plate 4, the plate 4 is tightly attached to the forming female die. The process requires attention to the fact that the electromagnetic force applied to the coil should be less than the yield limit of the coil material to ensure the life of the coil.

Because the high-speed forming can cause the change of material characteristics, the annealing heat treatment needs to be carried out on the plate to be formed. And taking down the plate after the electromagnetic high-speed forming, and annealing.

In the above embodiment, the formed coil 5 is exemplified by a copper wire wound around the coil core 6 (such as insulation wood), but the present invention is not limited thereto, and may be a copper alloy wire, an aluminum wire, or a conductive wire made of a polymer conductive material.

The utility model discloses in, the coil that takes shape and the die that takes shape design according to automobile panel local characteristic (such as the knocker), make panel fully laminate with the die and prevent panel fracture, and through the electromagnetic high rate shaping model, can show the shaping limit that improves automobile panel (such as the knocker).

Although the present invention has been described in connection with the preferred embodiments, the embodiments are not intended to limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of protection of the invention should therefore be determined with reference to the claims that follow.

Claims

1. An electromagnetic forming device for local features of automobile panels, which is characterized by comprising:

the coil forming device comprises an upper gland (1), a forming female die (2), insulating resin (3), a forming coil (5), a coil core (6), a coil pressing ring (7), a coil ring seat (8), a lower base (10) and a charging and discharging circuit;

the forming coil (5) and the charging and discharging circuit form a pulse generating device;

the lower part of the coil core (6) is placed in the lower base (10), the upper part of the coil core is wound by a lead to form the formed coil (5), and the insulating resin (3) is wrapped on the upper parts of the formed coil (5) and the coil core (6) and the periphery of the formed coil (5);

the forming female die (2) is rigidly connected with the upper gland (1); the plate (4) is placed on the upper part of the coil ring seat (8), and the periphery of the plate (4) is fixedly connected with the coil ring seat (8) through the upper gland (1);

the coil ring seat (8) is placed above the lower base (10), the coil core (6) and the formed coil (5) which are wrapped by the insulating resin (3) are placed in an inner hole of the coil ring seat (8), and the coil ring seat (8) is rigidly connected with the lower base (10);

by insulating resin (3) parcel coil core (6) with it is the convex structure to take shape coil (5) upper portion install additional in coil ring seat (8) coil clamping ring (7) press coil core (6) with the shaft shoulder position of coil ring seat (5) upper portion convex structure takes shape, just coil clamping ring (7) with coil ring seat (8) rigid connection.

2. The apparatus of claim 1, further comprising:

cushion blocks (9) are placed above four corners of the lower base (10);

the coil ring seat (8) is pressed on the upper portion of the cushion block (9), and the coil ring seat (8) is rigidly connected with the cushion block (9) and the lower base (10).

3. The apparatus according to claim 1 or 2, wherein the charging and discharging circuit comprises:

a discharge switch (11), a charge switch (12), an alternating current power supply (13) and a capacitor bank (14);

the charging switch (12) and the alternating current power supply (13) are connected in series to form a branch circuit, and two ends of the branch circuit form a loop with the inner ring and the outer ring of the forming coil (5) through circuits respectively; the discharge switch (11) is connected with the branch in series; the capacitor bank (14) is connected in parallel with the branch.

4. The electromagnetic forming device for the local characteristics of the automobile panel as claimed in claim 1, wherein the die surface of the forming female die (2) is a die surface which is matched with the local characteristic shape of the automobile panel.

5. The device for electromagnetic forming of local features of automobile panels according to claim 1, characterized in that air holes for exhausting air are opened on the die surface of the forming female die (2).

6. The apparatus according to claim 1, wherein the conductive wire is a copper wire.