CN-121797829-B - Creep aging forming integrated device integrating acoustic emission and electric pulse

CN121797829BCN 121797829 BCN121797829 BCN 121797829BCN-121797829-B

Abstract

The invention relates to the technical field of creep aging forming, in particular to a creep aging forming integrated device integrating acoustic emission and electric pulse, which provides a stable creep aging temperature environment through a heating furnace, the die assembly in the loading system cooperates with the loading drive assembly to apply a precisely controllable forming load to the member to be formed to promote creep in the member to be formed. The acoustic emission monitoring system is integrated in the cavity of the heating furnace, acoustic signals generated by the initiation and expansion of the internal damage of the member to be formed are acquired in real time through the acoustic emission sensor fixed on the surface of the member and transmitted to external data processing equipment, so that the online in-situ sensing of the damage activity in the forming process is realized. The electric pulse repairing system integrated in the furnace can be immediately triggered, and the electrode guides the high-energy pulse current generated by the electric pulse generating equipment into the damaged area of the component based on the damaged state judged by the acoustic signal, so that the on-line in-situ repairing of the damage is realized.

Inventors

ZHAN LIHUA
REN HAOBO
ZHANG DONGDONG
LI TINGHAO
YIN ZHIHUA

Assignees

中南大学

Dates

Publication Date: 20260508
Application Date: 20260306

Claims (10)

1. The creep aging forming integrated device integrating acoustic emission and electric pulse is characterized by comprising a heating furnace, an acoustic emission monitoring system, an electric pulse repairing system and a loading system, wherein the heating furnace is connected with the acoustic emission monitoring system; the heating furnace is internally provided with a cavity, and a member to be formed is arranged in the cavity; the acoustic emission monitoring system comprises an acoustic emission sensor and data processing equipment, wherein the acoustic emission sensor is arranged in the cavity, the acoustic emission sensor is fixed on the member to be formed, and the acoustic emission sensor is connected with the data processing equipment outside the heating furnace; The electric pulse repairing system comprises electric pulse generating equipment and electrodes, wherein the electrodes are arranged in the cavity, the electrodes are fixed at two ends of the to-be-formed member, and the electrodes are connected with the electric pulse generating equipment outside the heating furnace; the loading system comprises a die assembly and a loading driving assembly, wherein the die assembly is arranged in the cavity, the die assembly is in contact with the member to be formed, the loading driving assembly is arranged outside the cavity, and the loading driving assembly is connected with the die assembly so as to drive the die assembly to apply the load required by creep aging forming to the member to be formed.
2. The integrated acoustic emission and electrical pulse creep age forming device of claim 1, further comprising a central controller, wherein the acoustic emission monitoring system, the electrical pulse repair system, and the loading system are all communicatively connected to the central controller for coordinated control.
3. The integrated creep-age forming device integrating acoustic emission and electric pulse according to claim 2, wherein the die assembly comprises an upper die and a lower die, the loading driving assembly comprises a driving motor and a lifting mechanism, the lifting mechanism is in transmission connection with the driving motor, the driving motor is connected with the central controller, an opening for the output end of the lifting mechanism to pass through is formed in the heating furnace, a furnace body insulating sleeve is arranged at the opening, the output end of the lifting mechanism is connected with the upper die to drive the upper die to move towards or away from the lower die, and the member to be formed is arranged between the upper die and the lower die.
4. The integrated creep aging forming device integrating acoustic emission and electric pulse according to claim 3, wherein the lifting mechanism comprises a hydraulic lifting rod, a die supporting plate is further fixed between an output section of the lifting mechanism and the upper die, a scale is arranged on a shell of the hydraulic lifting rod, and a numerical pointer matched with the scale is arranged on the die supporting plate connected with the upper die.
5. The creep aging forming integrated device integrating acoustic emission and electric pulse according to claim 3, wherein the upper die is a rod, the lower die is two plates, the rod extends downwards, the top of the rod is in contact with the middle of the member to be formed, the two plates are arranged below two ends of the member to be formed in parallel, the length direction of the plates is consistent with the width direction of the member to be formed, the length of the plates is larger than the width of the member to be formed, the top of the plates is in contact with the member to be formed, the rod and the two plates form a three-point bending forming structure together, and a die gasket is arranged between the upper die and the member to be formed and between the lower die and the member to be formed.
6. The creep aging forming integrated device integrating acoustic emission and electric pulse according to claim 3, further comprising an upper die conversion head and a die base, wherein the upper die is a solid male die, the solid male die comprises a target forming profile with a member to be formed, the upper die is detachably connected with the output end of the lifting mechanism through the upper die conversion head, the lower die is a solid female die, the solid female die comprises a target forming profile with a member to be formed, and the lower die is fixed in the cavity through the die base.
7. The integrated acoustic emission and electrical pulse creep age forming device of claim 6, wherein the upper die is a flexible male die having a target forming profile therein with a member to be formed, and the lower die is a flexible female die having a target forming profile therein with a member to be formed.
8. The integrated acoustic emission and electrical pulse creep age forming device according to claim 1, wherein the electrode is in particular an electrical pulse clamping assembly comprising an electrically conductive fixture frame fixedly connected to the end of the member to be formed by means of pins, the fixture frame being connected to the electrical pulse generating means by means of a current transmission line, the fixture frame being connected to the current transmission line by means of pins and clamping gaskets.
9. The integrated acoustic emission and electrical pulse creep-age forming apparatus of claim 1, further comprising a preamplifier and a display device, the preamplifier connected between the data processing device and acoustic emission sensor, the display device connected with the data processing device.
10. The integrated acoustic emission and electrical pulse creep-age forming apparatus of claim 1, further comprising the steps of, prior to loading the component to be formed into the furnace: determining a target forming curvature according to the target forming profile of the member to be formed; based on the target forming curvature, simulating a creep aging forming process of the member to be formed through finite element simulation, thereby determining high stress area distribution of the member to be formed in the creep aging forming process and obtaining a simulation result; marking the position of the surface of the member to be formed corresponding to the high stress area according to the simulation result; the arrangement position of the acoustic emission sensor is determined at least in part on the basis of the marking position.

Description

Creep aging forming integrated device integrating acoustic emission and electric pulse Technical Field The invention relates to the technical field of creep age forming, in particular to a creep age forming integrated device integrating acoustic emission and electric pulse. Background The creep aging forming technology is used as an advanced forming technology for manufacturing large complex curved surface components in the aerospace field, and the creep deformation and aging strengthening of materials are combined, so that the components are gradually formed and synchronously improved in performance under specific temperature and stress, and the integrated manufacturing of the shape is realized. In the traditional creep aging forming manufacturing of the aerospace component, the component is sealed on a fixed die through a vacuum bag and pushed into an autoclave for thermal forming, and after the creep process is finished, the autoclave is opened to obtain the forming result of the component. This conventional process mode has a fundamental disadvantage in that the forming process is in a "black box" condition that is difficult to detect. Because the stress state and damage risk of a local high-stress area in the component forming process cannot be monitored and evaluated in real time outside the tank, the technological parameters cannot be dynamically adjusted according to the actual deformation state of the component. Therefore, the selection of the process parameters may not match with the actual deformation state of the component, which is very easy to cause damage such as microcracks, holes and the like of the component in invisible interiors, and the damage can only be found after can discharging and even in subsequent detection, so that serious material scrapping and cost loss are caused. The damage monitoring means and the damage repairing means in the prior art are mutually independent in time and space. When the member is damaged in the forming process, the process must be interrupted, the member must be removed and repaired in special equipment, which not only results in complicated procedures and low efficiency, but also may introduce new errors or damage due to repeated clamping and sealing. In other words, the monitoring link cannot guide the repair in real time, and the repair link cannot be performed in situ at the first time of the damage. The functional separation and flow disconnection of monitoring and repairing make the closed-loop manufacturing mode from online perception to instant intervention difficult to realize, and become a key technical bottleneck for restricting the improvement of the forming quality and efficiency of the components. Disclosure of Invention The invention mainly aims to provide a creep age forming integrated device integrating acoustic emission and electric pulse, which aims to solve the technical problems that the existing creep age forming equipment cannot monitor a local high-stress area in real time in the forming process of a component, so that the process condition cannot be adjusted in a timely and self-adaptive manner according to the forming risk, and the internal damage of the component and the low yield are caused. The invention provides a creep aging forming integrated device integrating acoustic emission and electric pulse, which comprises a heating furnace, an acoustic emission monitoring system, an electric pulse repairing system and a loading system, wherein a cavity is formed in the heating furnace, a member to be formed is arranged in the cavity, the acoustic emission monitoring system comprises an acoustic emission sensor and data processing equipment, the acoustic emission sensor is arranged in the cavity and is fixed on the member to be formed, the acoustic emission sensor is connected with the data processing equipment outside the heating furnace, the electric pulse repairing system comprises an electric pulse generating equipment and an electrode, the electrode is arranged in the cavity, the electrode is fixed at two ends of the member to be formed, the electrode is connected with the electric pulse generating equipment outside the heating furnace, the loading system comprises a die assembly and a loading driving assembly, the die assembly is arranged in the cavity, the die assembly is in contact with the member to be formed, the loading driving assembly is arranged outside the cavity, and the loading driving assembly is connected with the die assembly to apply a load required for aging forming to the member to be formed. Further, the system also comprises a central controller, and the acoustic emission monitoring system, the electric pulse repairing system and the loading system are all in communication connection with the central controller so as to realize cooperative control. Still preferably, the die assembly comprises an upper die and a lower die, the loading driving assembly comprises a driving motor and a lifting mechanism, the li