Multi-stage electric field auxiliary forming device and method for high-temperature titanium alloy thin-wall corrugated board structure

Abstract

The invention relates to a multi-stage electric field auxiliary forming device and method for a high-temperature titanium alloy thin-wall corrugated board structure. A high-temperature titanium alloy foil is placed on a feeding table, a motor power source is switched on to enable a lower forming roller to rotate, the foil enters the position between an upper forming roller and the lower forming roller, the motor power source is switched off after the foil is gripped, and a low-voltage large-current pulse direct-current power source is switched on; and the foil is heated. When the temperature of the foil reaches the target temperature, the motor is powered on, the lower forming roller rotates to drive the upper forming roller and the foil to move, and the corrugated board characteristics are preformed. And then, the pre-formed corrugation enters a second-stage forming process, and the specific forming process is kept consistent with the previous-stage forming process. And finally, the corrugated board is formed through multi-stage electric assistance. Compared with the prior art, through multi-stage forming, the current needed by single-stage forming is reduced, the service life of the device is prolonged, the requirement for the measuring range of a pulse direct-current power source is reduced, and accurate forming of the small fillet characteristic of the high-temperature titanium alloy corrugated board is ensured through the current directional flowing characteristic.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical engineering, in particular to a multi-stage electric field assisted forming device and method for high-temperature titanium alloy thin-walled corrugated plate structure. BACKGROUND

[0002] As the core structure of high-performance honeycomb core sandwich, high-temperature titanium alloy corrugated plate has excellent specific strength, impact resistance and heat resistance, and has important application value in the field of aerospace. However, high-temperature titanium alloy shows significant high flow stress and low plasticity characteristics when formed at room temperature or lower temperature, which easily induces forming cracking defects. At the same time, the severe springback phenomenon after forming of thin-walled components restricts the control of geometric precision. In addition, high-temperature titanium alloy corrugated plate has the characteristics of thin-walled and small fillet structure, which further makes its forming manufacturing face great technical obstacles.

[0003] Patent CN202322780421.8 discloses a fuel cell metal bipolar plate electric auxiliary stamping device. The disclosed metal bipolar plate has highly consistent geometric characteristics with the corrugated plate. The method heats the sheet by electric current, and when the target temperature reaches the target temperature, the power is turned off and the press is operated to realize stamping die closing. This method only uses the heating effect of electric current to heat the sheet, and the power is turned off during the actual forming process. In addition, the length of the formed metal bipolar plate is limited by the stamping die.

[0004] Patent CN202210833372.7 discloses a titanium foil ultrasonic assisted roll forming method under variable tensile stress state. The method fixes the titanium foil on a stress adjusting device, sets the ultrasonic vibration parameters, and realizes ultrasonic assisted roll forming. However, ultrasonic vibration needs to be transmitted through the roller-plate interface, and the energy loss rate is high. Moreover, this method is currently only applied to the forming of non-high-temperature titanium alloy Ti-2.5Al-1.5Mn with good forming performance, and for high-temperature titanium alloy with poor forming performance, the forming precision under the condition of only applying ultrasonic energy field without additional introduction of heat energy is not verified.

[0005] In view of the above problems, it is urgent to explore a simple, efficient and energy-saving forming method to ensure the forming precision of high-temperature titanium alloy thin-walled corrugated plate structure and provide technical support for the lightweight design and reliable manufacturing of the next generation of aerospace equipment. SUMMARY

[0006] The present application aims to overcome the defects of the prior art and provide a multi-stage electric field assisted forming device and method for high-temperature titanium alloy thin-walled corrugated plate structure.

[0007] The object of the present application can be achieved by the following technical solutions:

[0008] The present application relates to a multi-stage electric field assisted forming device and method for high-temperature titanium alloy thin-walled corrugated plate structure. First, the high-temperature titanium alloy foil is placed on the feeding table, the motor power is turned on to start the rotation of the lower forming roller, and the foil enters between the upper and lower forming rollers by friction. Second, after determining that the upper and lower forming rollers have bitten into the high-temperature titanium alloy foil, the motor power is turned off, and the low-voltage high-current pulse direct current power source is turned on. The current forms a loop of "power positive pole-upper roller shaft-upper forming roller-high-temperature titanium alloy foil-lower forming roller-lower roller shaft", and the foil is heated. When the temperature of the foil reaches the target temperature, the motor power is turned on again, the lower forming roller starts to rotate, and the upper forming roller moves together with the high-temperature foil to be formed to preform the corrugated plate features. Then, the preformed corrugated plate enters the second stage of forming process, and the specific forming process is consistent with the previous stage, but the forming current can be reduced. Finally, the corrugated plate is formed by multi-stage electric field assisted forming. Compared with the prior art, the present application significantly reduces the current required for single-stage forming, improves the service life of the device, and reduces the range requirement of the pulse direct current power source. The present application uses the directional flow characteristics of the current to ensure the accurate forming of the small round corner features of the high-temperature titanium alloy corrugated plate. In addition, the characteristics of continuous rolling forming make the forming length of the corrugated plate not limited by the device, and the forming efficiency is high, which provides a reliable solution for high-quality corrugated plate structure manufacturing.

[0009] In a first aspect, the present application provides a multi-stage electric field assisted forming method for high-temperature titanium alloy thin-walled corrugated plate structure, which comprises the following steps:

[0010] The high-temperature titanium alloy foil is placed on the feeding table, the first motor power is turned on to start the rotation of the first lower forming roller, and the high-temperature titanium alloy foil enters between the first upper and lower forming rollers by friction.

[0011] After determining that the first upper and lower forming rollers have bitten into the high-temperature titanium alloy foil, the first motor power is turned off, and the first upper and lower forming rollers stop rotating.

[0012] A suitable pulse current parameter, such as current, current frequency and duty cycle, is set, a first low-voltage large-current pulse DC power supply is turned on, the current flows into the first upper roller shaft, passes through the first upper forming roller, flows through the high-temperature titanium alloy foil, and then flows out through the first lower forming roller and the first lower roller shaft;

[0013] The temperature of the high-temperature titanium alloy foil at the bite of the first upper forming roller and the first lower forming roller is observed by an infrared thermal imager. When the temperature of the high-temperature titanium alloy foil at the bite of the first upper forming roller and the first lower forming roller reaches the target temperature, the first motor power supply is turned on again, the first lower forming roller starts to rotate and drives the first upper forming roller to move with the high-temperature foil to be formed, and the high-temperature titanium alloy foil starts to pre-form the corrugated board features, i.e. a corrugated board formed by the first stage is obtained.

[0014] When the corrugated board formed by the first stage moves to the second stage forming area, the second motor power supply is turned on, and the second lower forming roller starts to rotate and drives the second upper forming roller to move.

[0015] When the corrugated board formed by the first stage enters between the second upper forming roller and the second lower forming roller and forms stable contact, the second low-voltage large-current pulse DC power supply is turned on to perform secondary forming on the corrugated board formed by the first stage, i.e. a corrugated board formed by the second stage is obtained.

[0016] Further, the method further comprises the following steps:

[0017] After the corrugated board formed by the first stage completely leaves the first stage forming area, the first low-voltage large-current pulse DC power supply and the first motor power supply are turned off.

[0018] After the corrugated board formed by the second stage completely leaves the second stage forming area, the second low-voltage large-current pulse DC power supply and the second motor power supply are turned off in sequence.

[0019] Further, the required forming stages (forming passes) are determined according to the actual structure of the corrugated board.

[0020] Further, when the required forming passes of the high-temperature titanium alloy thin-walled corrugated board structure are greater than 2, i.e. the required forming stages are greater than 2, the method further comprises the following steps:

[0021] When the corrugated board formed by the N-1 stage moves to the N stage forming area, the N motor power supply is turned on, the N lower forming roller starts to rotate and drives the N upper forming roller to move.

[0022] When the corrugated board formed by the N-1 stage enters between the N upper forming roller and the N lower forming roller and forms stable contact, the N low-voltage large-current pulse DC power supply is turned on to perform secondary forming on the corrugated board formed by the N-1 stage, i.e. a corrugated board formed by the N stage is obtained.

[0023] From N equals 3 (three), increase N one by one to repeat the above steps until N reaches the required forming number of the high-temperature titanium alloy thin-walled corrugated plate structure, wherein N is a positive integer.

[0024] Further, in the step, when the corrugated plate formed by the N-1th forming enters between the Nth upper forming roller and the Nth lower forming roller and forms stable contact, the Nth motor is cut off, the Nth low-voltage large-current pulse direct current power supply is turned on again, after the temperature of the high-temperature titanium alloy foil reaches the target temperature, the Nth motor is turned on again, and the corrugated plate formed by the N-1th forming is formed N times, that is, the corrugated plate formed by the Nth forming is obtained.

[0025] Further, after the corrugated plate formed by the Nth forming completely leaves the Nth forming area, the Nth low-voltage large-current pulse direct current power supply and the Nth motor power supply are turned off in turn.

[0026] Further, each forming has a setting relationship, for example, the first forming target angle is 135°, the second forming target is 120°, that is, the target forming angle of the previous stage is greater than that of the next stage; the full height of the teeth on the forming roller of the next stage is greater than that of the forming roller of the previous stage, and the tooth width of the forming roller of the next stage is less than that of the forming roller of the previous stage. Further, the current forms a loop of "low-voltage large-current pulse direct current power supply positive electrode-upper roller shaft-upper forming roller-high-temperature titanium alloy foil-lower forming roller-lower roller shaft-low-voltage large-current pulse direct current power supply negative electrode" or "low-voltage large-current pulse direct current power supply positive electrode-lower roller shaft-lower forming roller-high-temperature titanium alloy foil-upper forming roller-upper roller shaft-low-voltage large-current pulse direct current power supply negative electrode".

[0027] Further preferably, the positive electrode and the negative electrode of the first low-voltage large-current pulse direct current power supply are connected to the first upper roller shaft and the first lower roller shaft one by one respectively; the positive electrode and the negative electrode of the second low-voltage large-current pulse direct current power supply are connected to the second upper roller shaft and the second lower roller shaft one by one respectively; and the current forms a loop of "low-voltage large-current pulse direct current power supply positive electrode-upper roller shaft-upper forming roller-high-temperature titanium alloy foil-lower forming roller-lower roller shaft-low-voltage large-current pulse direct current power supply negative electrode".

[0028] Further, in the step, when the corrugated plate formed by the first forming enters between the second upper forming roller and the second lower forming roller and forms stable contact, the second motor is cut off, the second low-voltage large-current pulse direct current power supply is turned on again, after the temperature of the high-temperature titanium alloy foil reaches the target temperature, the second motor is turned on again, and the corrugated plate formed by the first forming is formed twice, that is, the corrugated plate formed by the second forming is obtained.

[0029] In the second aspect of the present application, a multi-stage electric field assisted forming device for high-temperature titanium alloy thin-walled corrugated plate structure is provided for implementing the multi-stage electric field assisted forming method for high-temperature titanium alloy thin-walled corrugated plate structure, and the multi-stage electric field assisted forming device for high-temperature titanium alloy thin-walled corrugated plate structure is used for forming a high-temperature titanium alloy foil corrugated plate structure.

[0030] Further, the multi-stage electric field assisted forming device comprises a multi-stage forming mechanism, i.e., a multi-stage forming roller and a roller shaft. Taking two-stage forming as an example, the first upper forming roller, the first lower forming roller, the first upper roller shaft, the first lower roller shaft, the second upper forming roller, the second lower forming roller, the second upper roller shaft, and the second lower roller shaft are provided.

[0031] Further, for each stage forming mechanism, the upper forming roller and the lower forming roller are used for forming a high-temperature titanium alloy thin-walled corrugated plate.

[0032] Further, for each stage forming mechanism, the upper roller shaft and the lower roller shaft are connected with a low-voltage high-current pulse direct current power source respectively, and play a role of introducing current.

[0033] Further, for each stage forming mechanism, the lower roller shaft is directly connected with a motor, and the motor provides power. Therefore, the lower forming roller serves as a driving wheel, and the upper forming roller serves as a driven wheel.

[0034] Further, the upper roller shaft and the lower roller shaft are connected by ceramic bearings and insulated from the outside.

[0035] Further, the device comprises a feeding table, a first stage forming mechanism, and a second stage forming mechanism.

[0036] The feeding table, the first stage forming mechanism, and the second stage forming mechanism are sequentially arranged.

[0037] The first stage forming mechanism comprises a first upper forming roller, a first lower forming roller, a first low-voltage high-current pulse direct current power source, a first upper roller shaft, a first lower roller shaft, and a first motor.

[0038] The first upper forming roller and the first lower forming roller are arranged oppositely, and a first stage forming area for implementing first stage forming of a high-temperature titanium alloy foil corrugated plate structure is formed between the first upper forming roller and the first lower forming roller.

[0039] The first low-voltage high-current pulse direct current power source is connected with the first upper roller shaft and the first lower roller shaft respectively.

[0040] The first upper roller shaft is connected with the first upper forming roller.

[0041] The first lower roller shaft is connected with the first lower forming roller.

[0042] The first motor is connected with the first lower roller shaft.

[0043] The second stage forming mechanism comprises a second upper forming roller, a second lower forming roller, a second low-voltage large-current pulse direct current power supply, a second upper roller shaft, a second lower roller shaft and a second motor.

[0044] The second upper forming roller and the second lower forming roller are oppositely arranged, and a second stage forming area for realizing the second stage forming of the high-temperature titanium alloy foil corrugated plate structure is formed between the second upper forming roller and the second lower forming roller.

[0045] The second low-voltage large-current pulse direct current power supply is connected with the second upper roller shaft and the second lower roller shaft respectively.

[0046] The second upper roller shaft is connected with the second upper forming roller.

[0047] The second lower roller shaft is connected with the second lower forming roller.

[0048] The second motor is connected with the second lower roller shaft.

[0049] Further, the device further comprises a plurality of forming mechanisms.

[0050] The plurality of forming mechanisms are sequentially arranged behind the second stage forming mechanism.

[0051] Each forming mechanism comprises an upper forming roller, a lower forming roller, a low-voltage large-current pulse direct current power supply, an upper roller shaft, a lower roller shaft and a motor.

[0052] The upper forming roller and the lower forming roller are oppositely arranged, and a forming area for realizing the stage forming of the high-temperature titanium alloy foil corrugated plate structure is formed between the upper forming roller and the lower forming roller.

[0053] The low-voltage large-current pulse direct current power supply is connected with the upper forming roller and the lower forming roller respectively.

[0054] The upper roller shaft is connected with the upper forming roller.

[0055] The lower roller shaft is connected with the lower forming roller.

[0056] The motor is connected with the lower roller shaft.

[0057] Further, the positive electrode and the negative electrode of the first low-voltage large-current pulse direct current power supply are connected with the first upper roller shaft and the first lower roller shaft one by one respectively.

[0058] The positive electrode and the negative electrode of the second low-voltage large-current pulse direct current power supply are connected with the second upper roller shaft and the second lower roller shaft one by one respectively.

[0059] Further, the device further comprises a device housing, the first upper roller shaft, the first lower roller shaft, the second upper roller shaft, the second lower roller shaft, the first motor (main body part), the second motor (main body part) are connected with the device housing.

[0060] Further, the upper roller shaft, the lower roller shaft, the motor (main body part) are connected with the device housing.

[0061] Further, the first upper roller shaft, the first lower roller shaft are connected by ceramic bearings (connected on the device housing) and are insulated from the outside (device housing).

[0062] Further, the second upper roller shaft and the second lower roller shaft are connected by ceramic bearings (connected on the device housing) and are insulated from the outside (device housing).

[0063] Further, the upper roller shaft and the lower roller shaft are connected by ceramic bearings (connected on the device housing) and are insulated from the outside (device housing).

[0064] Further, the first upper forming roller and the first lower forming roller are made of heat-resistant stainless steel or high-temperature alloy.

[0065] Further, the second upper roller shaft and the second upper forming roller are made of heat-resistant stainless steel or high-temperature alloy.

[0066] Compared with the prior art, the present application has the following advantages:

[0067] (1) The present application uses a multi-stage electric auxiliary roller forming method, which effectively reduces the required current size in the forming process, reduces the requirements for pulse DC power equipment, and greatly reduces the forming energy consumption. In addition, after the current required for each stage of forming is reduced, the temperature rise of the forming device is significantly reduced, and the service life is increased.

[0068] (2) The present application can realize precise local forming of small fillets. Based on the current directional flow characteristics, the current density at the key feature of the small fillet of the corrugated board is improved, and the fillet will be thinned during the forming process. At this point, the current density increases, the electroplastic effect is enhanced, which promotes the temperature rise and softening of the material at this point. At the same time, the increase of current density also enhances the non-thermal effect of current at this point. The joule heat effect and non-thermal effect caused by current jointly promote the multi-stage local forming of small fillets.

[0069] (3) The present application can realize high-efficiency manufacturing of corrugated board structure. For roller forming, the length of the corrugated board to be formed is not limited by the mold. The titanium alloy foil feeding cooperates with the multi-stage roller rotation, which can continuously form corrugated boards meeting the size accuracy, and no subsequent shaping process is needed, so the forming efficiency is higher.

[0070] (4) The present application can improve the formability of the corrugated plate structure. The multi-stage roll forming makes the foil material continuously bend, and the material flow (material deformation) is concentrated at the small corner features of the corrugated plate. The total deformation of the small corner is distributed to each stage of the forming process, and the bevel portion of the corrugated plate hardly deforms, and the tearing defect of the foil material is not prone to occur. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 It is a schematic diagram of the high-temperature titanium alloy thin-walled corrugated plate structure of the present example (repeating structure unit, only a part is shown).

[0072] Figure 2 It is a schematic diagram of the multi-stage electric field assisted forming device for the thin high-temperature titanium alloy thin-walled corrugated plate structure of the present example.

[0073] REFERENCE NUMERALS:

[0074] 1. High-temperature titanium alloy foil, 2. First upper forming roller, 3. First lower forming roller, 4. First low-voltage large-current pulse direct current power supply, 5. First upper roller shaft, 6. First lower roller shaft, 7. Feeding table, 8. Second upper forming roller, 9. Second lower forming roller, 10. Second upper roller shaft, 11. Second lower roller shaft, 12. Second low-voltage large-current pulse direct current power supply. DETAILED DESCRIPTION

[0075] The present application will be described in detail below in conjunction with the drawings and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present application, and detailed implementation and specific operation processes are given, but the protection scope of the present application is not limited to the following examples.

[0076] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0077] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] In the present application, the part model, material name, connection structure, control method and other features not explicitly described are considered as common technical features disclosed in the prior art.

[0079] The present application provides a multi-stage electric field assisted forming method for high-temperature titanium alloy thin-walled corrugated plate structure, taking two-stage forming as an example, comprising the following steps:

[0080] S1: Place the high-temperature titanium alloy foil 1 on the feeding table 7, connect the first motor power supply to start the first lower forming roller 3 to rotate actively, and the high-temperature titanium alloy foil 1 enters between the first upper forming roller 2 and the first lower forming roller 3 by means of friction;

[0081] S2: After determining that the first upper forming roller 2 and the first lower forming roller 3 have bitten into the high-temperature titanium alloy foil 1, cut off the first motor power supply, and the first upper forming roller 2 and the first lower forming roller 3 stop rotating;

[0082] S3: Set appropriate pulse current parameters, such as current, current frequency and duty cycle, connect the first low-voltage high-current pulse DC power supply 4, the current flows in from the first upper roller shaft 5, flows through the first upper forming roller 2, then flows through the high-temperature titanium alloy foil 1, and then flows out through the first lower forming roller 3 and the first lower roller shaft 6;

[0083] S4: Observe the temperature of the high-temperature titanium alloy foil 1 at the biting place of the two rollers by infrared thermal imager, when the temperature of the high-temperature titanium alloy foil 1 at the biting place of the first upper forming roller 2 and the first lower forming roller 3 reaches the target temperature, reconnect the first motor power supply, the first lower forming roller 3 starts to rotate and drives the first upper forming roller 2 to move with the high-temperature foil to be formed, the high-temperature titanium alloy foil 1 starts to preform the corrugated plate feature, that is, the corrugated plate formed by the first stage is obtained;

[0084] S5: When the corrugated plate formed by the first stage moves to the second stage forming area (the area between the second upper forming roller 8 and the second lower forming roller 9), connect the second motor power supply, the second lower forming roller 9 starts to rotate and drives the second upper forming roller 8 to move;

[0085] S6: when the corrugated board shaped by the first stage enters between the second upper forming roller 8 and the second lower forming roller 9 and forms stable contact, the second low-voltage large-current pulse direct current power supply 12 is turned on, and the corrugated board shaped by the first stage is formed again, i.e. the corrugated board shaped by the second stage is obtained;

[0086] S7: after the corrugated board shaped by the first stage completely leaves the first stage forming area (the area between the first upper forming roller 2 and the first lower forming roller 3), the first low-voltage large-current pulse direct current power supply 4 and the first motor power supply are turned off.

[0087] S8: after the corrugated board shaped by the second stage completely leaves the second stage forming area, the second low-voltage large-current pulse direct current power supply 12 and the second motor power supply are turned off in turn.

[0088] In some embodiments of the present application, the required forming stages are determined according to the actual structure of the corrugated board.

[0089] In some embodiments of the present application, the positive and negative poles of the low-voltage large-current pulse direct current power supply are connected to the upper roller shaft and the lower roller shaft respectively.

[0090] In some embodiments of the present application, the upper roller shaft and the lower roller shaft are connected by ceramic bearings and insulated from the outside.

[0091] In some embodiments of the present application, the lower forming roller is connected to the motor through the lower roller shaft and serves as the driving wheel.

[0092] In some embodiments of the present application, the current forms a loop of "power supply positive pole-upper roller shaft-upper forming roller-high-temperature titanium alloy foil 1-lower forming roller-lower roller shaft-power supply negative pole".

[0093] In some embodiments of the present application, the upper forming roller and the lower forming roller are made of heat-resistant stainless steel or high-temperature alloy.

[0094] In some embodiments of the present application, the high-temperature titanium alloy foil 1 is first clamped between the upper and lower forming rollers, then the motor is turned off, the low-voltage large-current pulse direct current power supply is turned on, and after the temperature of the foil reaches the target temperature, the motor is turned on again.

[0095] Embodiment

[0096] The present embodiment provides a multi-stage electric field assisted forming device and method for high-temperature titanium alloy thin-walled corrugated board structure.

[0097] The high-temperature titanium alloy corrugated board is a continuous thin-walled structure with a small round corner feature, as shown in Figure 1 The high-temperature titanium alloy corrugated board is a structure formed by multi-stage electric field assisted forming of the high-temperature titanium alloy foil 1.

[0098] A schematic diagram of a multi-stage electric field assisted forming device for high-temperature titanium alloy thin-walled corrugated plate structure is shown in Figure 2 As an example of two-stage forming, the forming part includes a first upper forming roller 2, a first lower forming roller 3, a second upper forming roller 8, and a second lower forming roller 9. The support part includes a first upper roller shaft 5, a first lower roller shaft 6, a second upper roller shaft 10, and a second lower roller shaft 11, as well as a feeding table 7. In addition, the driving part includes a first motor and a second motor (not shown in the figure, both motors are commercially available or purchased, and the structure and working principle of the motors are prior art, which are not improved in the present application).

[0099] The first upper forming roller 2 and the first lower forming roller 3 are oppositely arranged, and a first-stage forming area for realizing the first-stage forming of the high-temperature titanium alloy foil 1 corrugated plate structure is formed between the first upper forming roller 2 and the first lower forming roller 3.

[0100] The positive and negative poles of the first low-voltage large-current pulse DC power supply 4 are respectively connected to the first upper roller shaft 5 and the first lower roller shaft 6 in one-to-one correspondence.

[0101] The first upper roller shaft 5 is connected to the first upper forming roller 2.

[0102] The first lower roller shaft 6 is connected to the first lower forming roller 3.

[0103] The output shaft of the first motor is connected to the first lower roller shaft 6.

[0104] The second upper forming roller 8 and the second lower forming roller 9 are oppositely arranged, and a second-stage forming area for realizing the second-stage forming of the high-temperature titanium alloy foil 1 corrugated plate structure is formed between the second upper forming roller 8 and the second lower forming roller 9.

[0105] The positive and negative poles of the second low-voltage large-current pulse DC power supply 12 are respectively connected to the second upper roller shaft 10 and the second lower roller shaft 11 in one-to-one correspondence.

[0106] The second upper roller shaft 10 is connected to the second upper forming roller 8.

[0107] The second lower roller shaft 11 is connected to the second lower forming roller 9.

[0108] The output shaft of the second motor is connected to the second lower roller shaft 11.

[0109] The high-temperature titanium alloy foil 1 is preformed into a corrugated plate structure by the rotational movement between the first upper forming roller 2 and the first lower forming roller 3, and then is finally formed into a corrugated plate structure by the second upper forming roller 8 and the second lower forming roller 9. One end of the first upper roller shaft 5 is connected to the positive pole of the first low-voltage high-current pulse direct current power supply 4. One end of the first lower roller shaft 6 is connected to the negative pole of the first low-voltage high-current pulse direct current power supply 4, and the other end is connected to the first motor. One end of the second upper roller shaft 10 is connected to the positive pole of the second low-voltage high-current pulse direct current power supply 12. One end of the second lower roller shaft 11 is connected to the negative pole of the second low-voltage high-current pulse direct current power supply 12, and the other end is connected to the second motor.

[0110] The first upper roller shaft 5, the first lower roller shaft 6, the second upper roller shaft 10, and the second lower roller shaft 11 are connected to the device shell (not shown in the figure) by ceramic bearings to achieve insulation treatment with the outside (device shell). The main body of the first motor and the main body of the second motor are connected to the device shell.

[0111] Further, the first upper forming roller 2, the first lower forming roller 3, the second upper forming roller 8, and the second lower forming roller 9 are made of heat-resistant stainless steel or high-temperature alloy.

[0112] Further, the feeding table 7 is made of insulating nylon.

[0113] After Figure 2 The multi-stage electric field assisted forming device shown in the figure realizes the multi-stage electric field assisted forming of the high-temperature titanium alloy thin-walled corrugated plate structure by the following steps:

[0114] S1: Place the high-temperature titanium alloy foil 1 on the feeding table 7, turn on the power supply of the first motor to start the active rotation of the first lower forming roller 3, and the high-temperature titanium alloy foil 1 enters between the first upper forming roller 2 and the first lower forming roller 3 by friction.

[0115] Further, the size parameters of the high-temperature titanium alloy foil 1 should be determined by the target corrugated plate structure, and processed into a specific size rectangular strip, for example, 200mm×20mm×0.1mm, by wire cutting or other machining methods.

[0116] S2: After determining that the first upper forming roller 2 and the first lower forming roller 3 have bitten into the high-temperature titanium alloy foil 1, turn off the power supply of the first motor, and the first upper forming roller 2 and the first lower forming roller 3 stop rotating.

[0117] Further, check the contact state between the high-temperature titanium alloy foil 1 and the first upper forming roller 2 and the first lower forming roller 3 to prevent local arcing after the first low-voltage high-current pulse direct current power supply 4 is turned on.

[0118] S3: Set appropriate pulse current parameters, such as current, current frequency and duty cycle, connect the first low-voltage high-current pulse DC power supply 4, the current flows from the first upper roller shaft 5, through the first upper forming roller 2, then flows through the high-temperature titanium alloy foil 1, and then flows out through the first lower forming roller 3 and the first lower roller shaft 6;

[0119] Further, taking the high-temperature titanium alloy foil 1 as an example, the appropriate pulse current parameters in the first stage forming process are: current 200A, current frequency 200Hz, and duty cycle 25%.

[0120] S4: Observe the temperature of the high-temperature titanium alloy foil 1 at the occlusion of the two rollers (the first upper forming roller 2 and the first lower forming roller 3) by the infrared thermal imager. When the temperature reaches the target temperature (target forming temperature), reconnect the first motor power supply, the first lower forming roller 3 starts to rotate and drives the first upper forming roller 2 to move with the high-temperature foil 1 to be formed, and the corrugated board features are formed, and the first stage formed corrugated board is obtained.

[0121] Further, taking the high-temperature titanium alloy foil 1 as an example, the target forming temperature is 500℃;

[0122] Further, taking the high-temperature titanium alloy foil 1 as an example, the rotational speed of the first lower forming roller 3 is set to 0.001 rad / s.

[0123] S5: When the first stage formed corrugated board moves to the second stage forming area, the second motor power supply is connected, and the second lower forming roller 11 starts to rotate and drives the second upper forming roller 10 to move;

[0124] S6: When the first stage formed corrugated board enters between the second upper forming roller 10 and the second lower forming roller 11 and forms stable contact, the second motor is cut off, and the second low-voltage high-current pulse DC power supply 12 is connected again. When the temperature of the high-temperature titanium alloy foil 1 reaches the target temperature (target forming temperature), the second motor is connected again to perform secondary forming on the first stage formed corrugated board, and the second stage formed corrugated board is obtained.

[0125] Further, taking the high-temperature titanium alloy foil 1 as an example, the appropriate pulse current parameters in the second stage forming process are: current 100A, current frequency 200Hz, and duty cycle 25%.

[0126] Further, taking the high-temperature titanium alloy foil 1 as an example, the target forming temperature is 300℃;

[0127] Further, taking the high-temperature titanium alloy foil 1 as an example, the rotational speed of the second lower forming roller 11 is set to 0.001 rad / s.

[0128] S6: after the corrugated board (the corrugated board formed by the first stage forming) completely leaves the first stage forming area, the first low-voltage large-current pulse direct current power supply 4 and the first motor power supply are turned off;

[0129] S7: after the corrugated board (the corrugated board formed by the second stage forming) completely leaves the second stage forming area, the second low-voltage large-current pulse direct current power supply 12 and the second motor power supply are turned off in sequence.

[0130] Comparative example

[0131] The comparative example provides a one-step electric auxiliary roll forming device and method for a high-temperature titanium alloy thin-walled corrugated board structure.

[0132] The device used in the comparative example is basically the same as that of the embodiment, and the difference lies in that:

[0133] The comparative example only sets up one stage of forming, and the forming part includes the first upper forming roller 2 and the first lower forming roller 3, the support part includes the first upper roller shaft 5, the first lower roller shaft 6 and the feeding table 7, in addition, the driving part includes the first motor (not shown in the figure, the motor is a commercially available or purchased part, the structure and working principle of the motor are prior art, and the present application does not improve it).

[0134] The method of the comparative example includes the following steps:

[0135] S1: place the high-temperature titanium alloy foil 1 on the feeding table 7, turn on the first motor power supply to make the first lower forming roller 3 start to rotate actively, and the high-temperature titanium alloy foil 1 enters between the first upper forming roller 2 and the first lower forming roller 3 by friction;

[0136] Further, the size parameters of the high-temperature titanium alloy foil 1 should be determined by the target corrugated board structure, and processed into a rectangular strip of a specific size, such as 200mm x 20mm x 0.1mm, by wire cutting and other machining methods.

[0137] S2: after determining that the first upper forming roller 2 and the first lower forming roller 3 have bitten into the high-temperature titanium alloy foil 1, turn off the first motor power supply, and the first upper forming roller 2 and the first lower forming roller 3 stop rotating;

[0138] Further, check the contact state between the high-temperature titanium alloy foil 1 and the first upper forming roller 2 and the first lower forming roller 3 to prevent the phenomenon of local arcing after the first low-voltage large-current pulse direct current power supply 4 is turned on.

[0139] S3: set appropriate pulse current parameters, such as current, current frequency and duty cycle, connect the first low-voltage large-current pulse DC power supply 4, the current flows into the first upper roller shaft 5, flows through the first upper forming roller 2, then flows through the high-temperature titanium alloy foil 1, and then flows out through the first lower forming roller 3 and the first lower roller shaft 6;

[0140] Taking the high-temperature titanium alloy foil 1 as an example, if only one step of electric auxiliary roll forming is adopted, the appropriate pulse current parameters are: current 700A, current frequency 200Hz, and duty cycle 25%.

[0141] S4: observe the temperature of the high-temperature titanium alloy foil 1 at the occlusion of the two rollers (the first upper forming roller 2 and the first lower forming roller 3) by the infrared thermal imager, when the temperature reaches the target temperature (target forming temperature), reconnect the first motor power supply, the first lower forming roller 3 starts to rotate and drives the first upper forming roller 2 to move with the high-temperature foil 1 to be formed, and the forming of the corrugated board feature is started, and the formed corrugated board is obtained.

[0142] Further, taking the high-temperature titanium alloy foil 1 as an example, the target forming temperature is 700℃.

[0143] Further, taking the high-temperature titanium alloy foil 1 as an example, the rotating speed of the first lower forming roller 3 is set to 0.001 rad / s.

[0144] S5: after the corrugated board (the corrugated board formed by the first stage) completely leaves the first stage forming area, the first low-voltage large-current pulse DC power supply 4 and the first motor power supply are turned off.

[0145] Compared with the embodiment, the required current size in the forming process is obviously larger, the requirement for the pulse DC power supply equipment is high, and the temperature rise of the forming device is obviously increased, which is not conducive to the service life.

[0146] The above describes the preferred embodiments of the application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the prior art according to the concept of the application should be within the protection scope determined by the claims.

[0147] The above description of the embodiments is for the convenience of the ordinary skilled person in the art to understand and use the application. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the application is not limited to the above embodiments, and any improvement and modification made by those skilled in the art without departing from the scope of the application should be within the protection scope of the application.

Claims

1. A multi-stage electric field-assisted forming method for high-temperature titanium alloy thin-walled corrugated plate structures, characterized in that, The method includes the following steps: The high-temperature titanium alloy foil (1) is placed on the feeding table (7), and the power supply of the first motor is turned on so that the first lower forming roller (3) starts to rotate actively. The high-temperature titanium alloy foil (1) enters between the first upper forming roller (2) and the first lower forming roller (3) by means of friction. After confirming that the first upper forming roller (2) and the first lower forming roller (3) have bitten into the high-temperature titanium alloy foil (1), the power supply to the first motor is cut off, and the first upper forming roller (2) and the first lower forming roller (3) stop rotating. Set the pulse current parameters, turn on the first low-voltage high-current pulse DC power supply (4), the current flows in from the first upper roller shaft (5), flows through the first upper forming roller (2), flows through the high-temperature titanium alloy foil (1), and then flows out through the first lower forming roller (3) and the first lower roller shaft (6); When the temperature of the high-temperature titanium alloy foil (1) at the meshing point of the first upper forming roller (2) and the first lower forming roller (3) reaches the target temperature, the power supply of the first motor is turned on again, the first lower forming roller (3) starts to rotate, and drives the first upper forming roller (2) to move together with the high-temperature foil to be formed. The high-temperature titanium alloy foil (1) begins to pre-form the corrugated board characteristics, that is, the corrugated board formed by the first stage is obtained. When the corrugated plate formed in the first stage moves to the second stage forming area, the power supply of the second motor is turned on, the second lower forming roller (9) starts to rotate, and drives the second upper forming roller (8) to move. When the corrugated sheet formed by the first stage enters between the second upper forming roller (8) and the second lower forming roller (9) and forms a stable contact, the second low-voltage high-current pulse DC power supply (12) is turned on to perform secondary forming on the corrugated sheet formed by the first stage, thus obtaining the corrugated sheet formed by the second stage.

2. The multi-stage electric field-assisted forming method for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 1, characterized in that, After the corrugated plate formed by the first stage has completely left the first stage forming area, turn off the first low-voltage high-current pulse DC power supply (4) and the first motor power supply. After the corrugated board formed by the second stage has completely left the second stage forming area, the second low-voltage high-current pulse DC power supply (12) and the second motor power supply are turned off in sequence.

3. The multi-stage electric field-assisted forming method for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 1, characterized in that, The required number of forming stages is determined based on the actual structure of the corrugated board.

4. The multi-stage electric field-assisted forming method for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 1, characterized in that, When the required number of forming stages for the high-temperature titanium alloy thin-walled corrugated plate structure is greater than 2, the method further includes the following steps: When the corrugated plate formed by the N-1th stage moves to the Nth stage forming area, the power supply of the Nth motor is turned on, the Nth lower forming roller starts to rotate, and drives the Nth upper forming roller to move. When the corrugated sheet formed by the N-1th stage enters between the Nth upper forming roller and the Nth lower forming roller and forms a stable contact, the Nth low-voltage high-current pulse DC power supply is turned on to perform secondary forming on the corrugated sheet formed by the N-1th stage, thus obtaining the corrugated sheet formed by the Nth stage. Starting with N equal to 3, increase N one by one and repeat the above steps until N reaches the forming level required for the high-temperature titanium alloy thin-walled corrugated plate structure, where N is a positive integer.

5. The multi-stage electric field-assisted forming method for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 1, characterized in that, The current forms a circuit of "positive terminal of low-voltage high-current pulsed DC power supply - upper roller shaft - upper forming roller - high-temperature titanium alloy foil - lower forming roller - lower roller shaft - negative terminal of low-voltage high-current pulsed DC power supply" or "positive terminal of low-voltage high-current pulsed DC power supply - lower roller shaft - lower forming roller - high-temperature titanium alloy foil - upper forming roller - upper roller shaft - negative terminal of low-voltage high-current pulsed DC power supply".

6. The multi-stage electric field-assisted forming method for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 1, characterized in that, In the process, when the corrugated sheet formed by the first stage enters between the second upper forming roller (8) and the second lower forming roller (9) and forms a stable contact, the second motor is cut off and the second low-voltage high-current pulse DC power supply (12) is turned on. After the temperature of the high-temperature titanium alloy foil (1) reaches the target temperature, the second motor is turned on again to perform secondary forming on the corrugated sheet formed by the first stage, thus obtaining the corrugated sheet formed by the second stage.

7. A multi-stage electric field-assisted forming device for high-temperature titanium alloy thin-walled corrugated plate structures, used to realize the multi-stage electric field-assisted forming method for high-temperature titanium alloy thin-walled corrugated plate structures as described in any one of claims 1-6, characterized in that, The device is used to realize the forming of a corrugated plate structure of high temperature titanium alloy foil (1); The device includes a feeding table (7), a first-stage forming mechanism, and a second-stage forming mechanism; The feeding platform (7), the first-stage forming mechanism, and the second-stage forming mechanism are arranged sequentially. The first-stage forming mechanism includes a first upper forming roller (2), a first lower forming roller (3), a first low-voltage high-current pulse DC power supply (4), a first upper roller shaft (5), a first lower roller shaft (6), and a first motor; The first upper forming roller (2) and the first lower forming roller (3) are arranged opposite to each other, and a first-level forming area is formed between the first upper forming roller (2) and the first lower forming roller (3) for realizing the first-level forming of the corrugated plate structure of the high-temperature titanium alloy foil (1); The first low-voltage high-current pulsed DC power supply (4) is connected to the first upper roller shaft (5) and the first lower roller shaft (6) respectively; The first upper roller shaft (5) is connected to the first upper forming roller (2); The first lower roller shaft (6) is connected to the first lower forming roller (3); The first motor is connected to the first lower roller shaft (6); The second-stage forming mechanism includes a second upper forming roller (8), a second lower forming roller (9), a second low-voltage high-current pulsed DC power supply (12), a second upper roller shaft (10), a second lower roller shaft (11), and a second motor; The second upper forming roller (8) and the second lower forming roller (9) are arranged opposite to each other, and a second-level forming area is formed between the second upper forming roller (8) and the second lower forming roller (9) for realizing the second-level forming of the corrugated plate structure of the high-temperature titanium alloy foil (1); The second low-voltage high-current pulsed DC power supply (12) is connected to the second upper roller shaft (10) and the second lower roller shaft (11) respectively; The second upper roller shaft (10) is connected to the second upper forming roller (8); The second lower roller shaft (11) is connected to the second lower forming roller (9); The second motor is connected to the second lower roller shaft (11).

8. The multi-stage electric field-assisted forming device for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 7, characterized in that, The device also includes multiple forming mechanisms; Multiple forming mechanisms are sequentially arranged after the second-stage forming mechanism; Each forming mechanism includes an upper forming roller, a lower forming roller, a low-voltage high-current pulsed DC power supply, an upper roller shaft, a lower roller shaft, and a motor; The upper forming roller and the lower forming roller are arranged opposite to each other, and a forming area is formed between the upper forming roller and the lower forming roller for realizing the corrugated plate structure forming of high temperature titanium alloy foil. The low-voltage, high-current pulsed DC power supply is connected to the upper forming roller and the lower forming roller respectively. The upper roller shaft is connected to the upper forming roller; The lower roller shaft is connected to the lower forming roller; The motor is connected to the lower roller shaft.

9. The multi-stage electric field-assisted forming device for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 7, characterized in that, The first upper roller shaft (5) and the first lower roller shaft (6) are connected by ceramic bearings and are insulated from the outside. The second upper roller shaft (10) and the second lower roller shaft (11) are connected by ceramic bearings and are insulated from the outside.

10. The multi-stage electric field-assisted forming device for a high-temperature titanium alloy thin-walled corrugated plate structure according to claim 7, characterized in that, The first upper forming roller (2) and the first lower forming roller (3) are made of heat-resistant stainless steel or high-temperature alloy; The second upper roller shaft (10) and the second upper forming roller (8) are made of heat-resistant stainless steel or high-temperature alloy.

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