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CN-122007227-A - Automatic edge pressing device for stainless steel plate and method thereof

CN122007227ACN 122007227 ACN122007227 ACN 122007227ACN-122007227-A

Abstract

The invention relates to the field of metal plastic forming and automatic processing equipment, in particular to an automatic edge pressing device for a stainless steel plate and a method thereof; the hydraulic edge pressing device comprises a C-shaped frame, a servo driving mechanism, a main actuating hydraulic cylinder, a flexible magnetorheological edge head and a compensation hydraulic cylinder, wherein a device is combined with a high polymer flexible film and internal magnetorheological fluid to construct an edge pressing executing end, a static pressure fluid loop is constructed between the head hydraulic cylinder and the tail hydraulic cylinder of the frame, the core is to provide edge pressing force according to the rules of flexible deformation lamination after power failure and rigid locking molding on power, and drive the compensation hydraulic cylinder to generate reverse extending thrust by utilizing the edge pressing reaction force.

Inventors

  • WANG XINLI
  • WANG NING
  • Chi Chengwu
  • DENG FEIYAN

Assignees

  • 宁波固顺和五金模具有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. An automated edge pressing device for stainless steel plates, comprising: the stainless steel processing device comprises a C-shaped frame (1), wherein a lower die holder (2) for supporting a stainless steel plate (3) to be processed is fixedly arranged at the bottom of the C-shaped frame (1); The servo motor (4) is fixedly connected to the top of the C-shaped frame (1), an output shaft (5) of the servo motor is coaxially connected with a ball screw (6), and the ball screw (6) extends to the inner cavity of the C-shaped frame (1) and is connected with a sliding seat (7); The main actuating hydraulic cylinder (8) is fixedly connected to the bottom of the sliding seat (7), a main actuating hydraulic cavity (9) is formed in the main actuating hydraulic cylinder (8), a blank holder head shell (11) is fixedly connected to the end part of a piston rod (10) of the main actuating hydraulic cylinder, a high-molecular flexible membrane (12) is fixedly sealed at the bottom opening of the blank holder head shell (11) and forms a closed magnetorheological fluid closed cavity (13) with the high-molecular flexible membrane, magnetorheological fluid (14) is filled in the magnetorheological fluid closed cavity (13), and exciting coils (15) are fixedly arranged on the inner wall of the magnetorheological fluid closed cavity in a matrix array; The compensation hydraulic cylinder (16) is vertically fixedly connected to the back pressure side of the C-shaped frame (1), the upper end and the lower end of the compensation hydraulic cylinder are respectively hinged to the top rear side and the bottom rear side of the C-shaped frame (1), and a rodless cavity (17) of the compensation hydraulic cylinder (16) is directly communicated with the main actuation hydraulic cavity (9) through a high-pressure oil pipe (18) to form a closed static pressure fluid loop.
  2. 2. The edge pressing device for the automatic stainless steel plate according to claim 1, wherein a linear guide rail (19) is arranged on the inner wall of the C-shaped frame (1), and the sliding seat (7) and the linear guide rail (19) form sliding guide fit.
  3. 3. The edge pressing device for the automatic stainless steel plate according to claim 1, wherein the ball screw (6) is coaxially connected with an output shaft (5) of the servo motor (4) through an elastic coupling (20).
  4. 4. The edge pressing device for the automatic stainless steel plate according to claim 1, wherein the edge pressing head shell (11) is of a bell-shaped structure with a hollow inside, and the edge of the macromolecule flexible membrane (12) is fixed on the bottom end face of the edge pressing head shell (11) in a sealing mode through a flange pressing plate (21).
  5. 5. The edge pressing method applied to the edge pressing device for the automatic stainless steel plate according to claim 1 is characterized by comprising the following steps: S1, controlling the servo motor (4) to drive the ball screw (6) to rotate, driving the sliding seat (7) to move downwards, keeping the exciting coil (15) in a power-off state, enabling the polymer flexible film (12) to contact the edge of the stainless steel plate (3) to deform freely and realizing profiling lamination; s2, introducing a preset initial current to the exciting coil (15) to enable the magnetorheological fluid (14) to be subjected to a chain effect and rigidly locked, and controlling the servo motor (4) to continuously output macroscopic downward pressure to force the stainless steel plate (3) to be subjected to plastic deformation; S3, acquiring a torque high-frequency fluctuation signal of the servo motor (4) in real time, and acquiring a transient pressure pulse signal in the main actuating hydraulic cavity (9); S4, carrying out integral operation on the torque high-frequency fluctuation signal in a time dimension to obtain input acting fluctuation quantity, and extracting a peak value of the transient pressure pulse signal to obtain transient deformation resistance; S5, calculating the phase difference between the input acting fluctuation amount and the transient deformation resistance on a time axis, judging whether the phase difference deviates from a preset standard safety interval, judging that the stainless steel plate (3) enters a high rebound risk area when the phase difference deviates from the preset standard safety interval, dynamically adjusting the duty ratio of a pulse width modulation signal input into the exciting coil (15), controlling the servo motor (4) to increase an oversteer compensation stroke, and maintaining the current state of the exciting coil (15) and continuously executing according to a preset pressing stroke when the phase difference does not deviate from the preset standard safety interval.
  6. 6. The edge pressing method according to claim 5, wherein in the step S2, the stainless steel plate (3) generates a reaction force to the edge pressing head shell (11) to press the piston rod (10) of the main actuating hydraulic cylinder (8) upwards, so that high-pressure fluid in the main actuating hydraulic chamber (9) is pumped into the rodless chamber (17) of the compensating hydraulic cylinder (16) through the high-pressure oil pipe (18), the compensating hydraulic cylinder (16) generates an extension thrust, and a reverse low-head moment is applied to the C-shaped frame (1) to offset the opening deformation moment.
  7. 7. The edge pressing method according to claim 5, wherein in the step S5, when the torque high-frequency fluctuation signal continuously rises and the transient pressure pulse signal exhibits high-frequency jitter to cause the phase difference to deviate from a preset standard safety interval, it is determined that the stainless steel material has locally entered a work hardening stage and accumulated elastic deformation energy, and the system enters the high-resilience risk area.
  8. 8. The edge pressing method according to claim 7, wherein in the step S5, when it is determined that the high rebound risk area is entered and the pressing stroke reaches a five percent stage, the electromagnetic field strength of the exciting coil (15) is proportionally reduced, and the shear yield stress of the magnetorheological fluid (14) is reduced to assume a slightly yielding state.
  9. 9. The edge pressing method according to claim 8, wherein in the step S5, the stainless steel plate (3) is forced to generate micro plastic flow to release internal residual stress by the physical withdrawal of the polymer flexible film (12) in the micro-yield state and the over-bending compensation stroke movement cooperation of the servo motor (4).
  10. 10. The edge pressing method according to claim 5, wherein the step of S5 includes, after: s601, controlling the servo motor (4) to reversely rotate to drive the sliding seat (7) to ascend; S602, controlling the exciting coil (15) to be powered off, so that the magnetorheological fluid (14) is recovered to a high fluidity state, and the polymer flexible membrane (12) is smoothly separated from the surface of the stainless steel plate (3).

Description

Automatic edge pressing device for stainless steel plate and method thereof Technical Field The invention relates to the field of metal plastic forming and automatic processing equipment, in particular to an automatic edge pressing device for a stainless steel plate and a method thereof. Background In order to perform edge pressing operation on the stainless steel plate, the prior proposal generally adopts a rigid pressure head or a simple flexible pressure head to mechanically press and complete plastic forming by relying on open-loop fixed stroke control, while the proposal has certain processing capacity under the condition of standard flat plate or low precision requirement, the rigid pressure head can not adapt to the position of high curvature edge and thickness tolerance, local stress concentration and surface damage are very easy to be caused, the simple flexible pressure head also lacks rigidity adjustment capacity, enough plastic forming force is difficult to be provided, in addition, the high pressure edge load often causes the equipment frame to generate tension deformation to cause edge pressing axis deviation, the traditional cured mechanical action and control framework is difficult to sense the energy accumulation and rheological state inside the material in real time, the unloading capacity of the edge pressing section is large, the process repeatability is poor, and the high precision supporting contour is difficult to be formed into the plate with high precision. Therefore, how to combine the profiling bonding of the contact interface and the high-rigidity molding force transmission in the edge pressing process, and identify the high rebound risk of the material in real time to perform dynamic self-adaptive compensation becomes a technical problem to be solved. Disclosure of Invention In order to solve the technical problems, the invention provides an automatic edge pressing device for a stainless steel plate and a method thereof, and specifically, the technical scheme of the invention is as follows: An automated edge pressing device for stainless steel plates, comprising: The bottom of the C-shaped frame is fixedly provided with a lower die holder for supporting a stainless steel plate to be processed; the servo motor is fixedly connected to the top of the C-shaped frame, an output shaft of the servo motor is coaxially connected with a ball screw, and the ball screw extends to the inner cavity of the C-shaped frame and is connected with a sliding seat; The main actuating hydraulic cylinder is fixedly connected to the bottom of the sliding seat, a main actuating hydraulic cavity is formed in the main actuating hydraulic cylinder, a blank holder shell is fixedly connected to the end part of a piston rod of the main actuating hydraulic cylinder, a high-molecular flexible membrane is fixedly sealed at the bottom of the blank holder shell, a closed magnetorheological fluid closed cavity is formed between the high-molecular flexible membrane and the high-molecular flexible membrane, magnetorheological fluid is filled in the magnetorheological fluid closed cavity, and exciting coils are fixedly arranged on the inner wall of the magnetorheological fluid closed cavity in a matrix array; the compensation hydraulic cylinder is vertically fixedly connected to the pressure-receiving side of the back of the C-shaped frame, the upper end and the lower end of the compensation hydraulic cylinder are respectively hinged to the rear side of the top and the rear side of the bottom of the C-shaped frame, and a rodless cavity of the compensation hydraulic cylinder is directly communicated with the main actuation hydraulic cavity through a high-pressure oil pipe to form a closed static pressure fluid loop. In one embodiment, a linear guide rail is arranged on the inner wall of the C-shaped frame, and the sliding seat and the linear guide rail form sliding guide fit. In one embodiment, the ball screw is coaxially connected with the output shaft of the servo motor through an elastic coupling. In one embodiment, the edge pressing head shell is of a bell-shaped structure with a hollow inside, and the edge of the polymer flexible membrane is fixed on the bottom end face of the edge pressing head shell in a sealing mode through a flange pressing plate. An automated edge pressing method for a stainless steel plate, comprising: s1, controlling the servo motor to drive the ball screw to rotate, driving the sliding seat to move downwards, keeping the exciting coil in a power-off state, enabling the polymer flexible film to contact the edge of the stainless steel plate to deform freely and realizing profiling lamination; S2, introducing a preset initial current to the exciting coil to enable the magnetorheological fluid to be subjected to a chain effect and rigidly locked, and controlling the servo motor to continuously output macroscopic downward pressure to force the stainless steel plate to be subjected to plastic def