CN-121972557-A - Double-stage magnetic coupling hydraulic impact forming device and method

CN121972557ACN 121972557 ACN121972557 ACN 121972557ACN-121972557-A

Abstract

The invention discloses a two-stage magnetic coupling hydraulic impact forming device and a method, wherein the two-stage magnetic coupling hydraulic impact forming device comprises a forming assembly, a first magnetic coupling assembly, a second magnetic coupling assembly and a control system; the forming assembly comprises a female die, a hydraulic cylinder filled with liquid medium and a plunger piece arranged in a sliding manner, one end of the hydraulic cylinder is in butt joint with the female die and is used for placing blanks, the first magnetic coupling assembly is arranged at the end, away from the female die, of the hydraulic cylinder, the plunger piece is driven by a coupling magnetic field to push the liquid medium, axial extrusion force is applied to the blanks, the second magnetic coupling assembly is arranged at the end, close to the female die, of the hydraulic cylinder, the blanks are driven by the coupling magnetic field to generate controllable radial deformation, and the control system is in communication connection with the two magnetic coupling assemblies to realize synchronous work. The invention ensures that the blank is uniformly stressed through the synergistic effect of the axial extrusion force and the radial electromagnetic force, inhibits the excessive thinning of the wall thickness, reduces the defects of stress concentration, cracking and the like, and obviously improves the dimensional accuracy of the formed part and the qualification rate of the finished product.

Inventors

CAO QUANLIANG
ZHANG WANG
LI XIAOXIANG
LI CHANGXING
LAI ZHIPENG
HAN XIAOTAO
LI LIANG

Assignees

华中科技大学

Dates

Publication Date: 20260505
Application Date: 20260203

Claims (10)

1. A two-stage magnetic coupling hydraulic impact forming device, comprising: The forming assembly comprises a female die, a hydraulic cylinder and a plunger piece, wherein a blank is placed at one end of the hydraulic cylinder and is in butt joint with the female die, the hydraulic cylinder is filled with a liquid medium, and the plunger piece is arranged at one end of the hydraulic cylinder far away from the female die in a sliding manner; The first magnetic coupling component is arranged at one end of the hydraulic cylinder, which is far away from the female die, and generates a first coupling magnetic field which drives the plunger element to push the liquid medium so as to axially extrude the blank; A second magnetic coupling component arranged at one end of the hydraulic cylinder close to the female die and generating a second coupling magnetic field which forces the blank to deform along the radial direction, and And the control system is in communication connection with the first magnetic coupling assembly and the second magnetic coupling assembly so as to enable the first magnetic coupling assembly and the second magnetic coupling assembly to work synchronously.
2. The two-stage magnetic coupling hydraulic impact forming device according to claim 1, wherein the first magnetic coupling assembly comprises a first power module, a first coil and a magnetic collector, one end of the magnetic collector faces the first coil, the other end of the magnetic collector faces the plunger element, and the first power module is connected with the first coil in series and transmits pulse current to the first coil so that the magnetic collector generates the first coupling magnetic field.
3. The dual-stage magnetic coupling hydraulic impact forming device of claim 2, wherein the first magnetic coupling assembly further comprises a second power module and a second coil, the second power module being connected in series with the second coil and delivering a pulsed current to the second coil to enhance the first coupling magnetic field.
4. The two-stage magnetic coupling hydraulic impact forming device according to claim 3, wherein the first power supply module comprises a first power supply loop and a first follow current branch, the first power supply loop comprises an energy storage power supply U 1 and a discharge switch K 1 , the energy storage power supply U 1 , the discharge switch K 1 and the first coil are connected in series, the first follow current branch is connected in parallel with the energy storage power supply U 1 , the first follow current branch comprises a follow current diode D 1 , a follow current resistor R 1 and a follow current inductor L 1 which are connected in series, the second power supply loop comprises a second power supply loop and a second follow current branch, the second power supply loop comprises an energy storage power supply U 2 and a discharge switch K 2 , the energy storage power supply U 2 , the discharge switch K 2 and the second coil are connected in series, the second follow current branch is connected in parallel with the energy storage power supply U 2 , and the second follow current branch comprises a follow current diode D 2 , a resistor R 2 and an inductor L 2 which are connected in series.
5. The two-stage magnetic coupling hydraulic impact forming device according to claim 2, wherein the magnetic collector has a large head end with a larger diameter and a small head end with a smaller diameter, the large head end faces the first coil, the small head end faces the plunger element, and the magnetic collector is provided with a through slit along an axial direction thereof.
6. The two-stage magnetic coupling hydraulic impact forming device according to claim 1, wherein the second magnetic coupling assembly comprises a third power module and a third coil, the third coil is arranged along the circumferential direction of the female die, the third power module is connected in series with the third coil, and pulse current is supplied to the third coil so that the third coil generates the second coupling magnetic field.
7. The two-stage magnetic coupling hydraulic impact forming device according to claim 6, wherein the third power supply module comprises a third power supply loop and a third freewheel branch, the third power supply loop comprises an energy storage power supply U 3 and a discharge switch K 3 , the energy storage power supply U 3 , the discharge switch K 3 and the third coil are connected in series with each other, the third freewheel branch is connected in parallel with the energy storage power supply U 3 , and the third freewheel branch comprises a freewheel diode D 3 , a freewheel resistor R 3 and a freewheel inductance L 3 connected in series with each other.
8. The two-stage magnetic coupling hydraulic impact forming device according to claim 1, wherein the plunger member comprises a copper driving plate and an aluminum impact body, the aluminum impact body is slidably arranged at one end of the hydraulic cylinder far away from the female die, and the copper driving plate responds to the first coupling magnetic field to drive the aluminum impact body to push a liquid medium.
9. The two-stage magnetic coupling hydraulic impact forming device according to claim 1, wherein the chamfering area of the female die is provided with a plurality of exhaust holes communicated with the outside.
10. A two-stage magnetic coupling hydraulic impact forming method, characterized in that it is applied to the two-stage magnetic coupling hydraulic impact forming device according to any one of claims 1 to 9, comprising: Placing a blank to be processed at one end of a hydraulic cylinder, which is close to the female die, so that the blank is in butt joint with the female die, and filling a liquid medium into the hydraulic cylinder; The control system sends a driving signal to the first magnetic coupling assembly to control the first magnetic coupling assembly to generate a first coupling magnetic field, and the first coupling magnetic field drives the plunger element to axially slide along the hydraulic cylinder so as to push the liquid medium to apply axial extrusion force to the blank; the control system sends a synchronous driving signal to the second magnetic coupling assembly to control the second magnetic coupling assembly to generate a second coupling magnetic field synchronous with the first coupling magnetic field, and the second coupling magnetic field applies radial acting force to the blank to force the blank to deform along the radial direction; And maintaining the first magnetic coupling assembly and the second magnetic coupling assembly to synchronously work until the blank completes the preset impact forming, and then closing the first magnetic coupling assembly and the second magnetic coupling assembly through a control system to complete the impact forming of the blank.

Description

Double-stage magnetic coupling hydraulic impact forming device and method Technical Field The invention relates to the field of stamping processing, in particular to a two-stage magnetic coupling hydraulic impact forming device and method. Background In the fields of sheet metal forming, special-shaped piece forging and the like, the hydraulic forming device is widely applied by virtue of the advantage of strong forming capability. The impact hydraulic forming technology drives a liquid medium (usually water) to move at a high speed through an impact body to realize plastic deformation of a component, and has the characteristics of liquid flexibility and high strain rate formed by dynamic impact loading. However, existing impact hydroforming techniques and equipment are loaded with a single impact source and cannot effectively control the material flow within the member, resulting in a deformation pattern of the member that is limited to a single stretch bulging. Under the deformation mode, when the complexity of the component is improved, if the structural characteristics of large stretching ratio, multiple bosses, local small fillets and the like exist, the problems of excessive thinning of the wall thickness of the blank, workpiece tearing and the like are caused due to insufficient gain of the high strain rate effect, and further the formed part is easy to crack, the dimensional accuracy is difficult to control, and the yield of the finished product is low. Therefore, how to avoid the problems of uneven stress on the blank, easy cracking of the formed part and low dimensional accuracy in the hydroforming process is a technical problem to be solved. Disclosure of Invention The invention aims to overcome the technical defects, and provides a two-stage magnetic coupling hydraulic impact forming device and a two-stage magnetic coupling hydraulic impact forming method, which solve the technical problems that in the prior art, blanks of the traditional hydraulic forming device are uneven in stress, formed pieces are easy to crack and the dimensional accuracy is low. In order to achieve the technical purpose, the invention adopts the following technical scheme: In a first aspect, the present invention provides a dual-stage magnetic coupling hydraulic impact forming device, comprising: The forming assembly comprises a female die, a hydraulic cylinder and a plunger piece, wherein a blank is placed at one end of the hydraulic cylinder and is in butt joint with the female die, the hydraulic cylinder is filled with a liquid medium, and the plunger piece is arranged at one end of the hydraulic cylinder far away from the female die in a sliding manner; The first magnetic coupling component is arranged at one end of the hydraulic cylinder, which is far away from the female die, and generates a first coupling magnetic field which drives the plunger element to push the liquid medium so as to axially extrude the blank; A second magnetic coupling component arranged at one end of the hydraulic cylinder close to the female die and generating a second coupling magnetic field which forces the blank to deform along the radial direction, and And the control system is in communication connection with the first magnetic coupling assembly and the second magnetic coupling assembly so as to enable the first magnetic coupling assembly and the second magnetic coupling assembly to work synchronously. In some embodiments, the first magnetic coupling assembly includes a first power module, a first coil, and a magnetic collector having one end facing the first coil and the other end facing the plunger member, the first power module being connected in series with the first coil and delivering a pulse current to the first coil to cause the magnetic collector to generate the first coupling magnetic field. In some embodiments, the first magnetic coupling assembly further comprises a second power module and a second coil, the second power module being connected in series with the second coil and delivering a pulsed current to the second coil to enhance the first coupling magnetic field. In some embodiments, the first power supply module comprises a first power supply loop and a first freewheeling branch, the first power supply loop comprises an energy storage power supply U 1 and a discharge switch K 1, the energy storage power supply U 1, the discharge switch K 1 and the first coil are mutually connected in series, the first freewheeling branch is connected in parallel with the energy storage power supply U 1, and the first freewheeling branch comprises a freewheeling diode D 1, a freewheeling resistor R 1 and a freewheeling inductor L 1 which are mutually connected in series, the second power supply loop comprises a second power supply loop and a second freewheeling branch, the second power supply loop comprises an energy storage power supply U 2 and a discharge switch K 2, the energy storage power supply U 2, the discharge switch K 2 and th