Thermal-mechanical coupling extrusion forming die and method for inner flange cabin component

Abstract

The invention discloses a thermal-mechanical coupling extrusion forming die and method for an inner flange cabin component, and belongs to the technical field of forming die, the forming die comprises a female die fixedly installed on a lower die plate and a male die fixedly installed on an upper die plate, a forming cavity matched with the male die is arranged in the female die, and the female die is internally provided with an extrusion cavity matched with the male die; a plurality of resistance heating wires surrounding the forming cavity are arranged in the female die, a water-cooling ejection disc is arranged on the bottom wall of the female die in a sliding mode, an ejection rod penetrating through the lower die plate is fixedly arranged at the bottom end of the water-cooling ejection disc, the ejection rod is connected with the lower die plate in a sliding mode, and a water-cooling channel is formed in the water-cooling ejection disc; the blank is cooled by injecting cooling water into the water cooling channel for circulation, the male die comprises a pre-forming male die and a wedge-shaped male die which are fixedly installed on the upper die plate, in the first forming stage, the blank is extruded through the pre-forming male die to form a pre-formed workpiece, and in the second forming stage, the wedge-shaped male die is extruded through the wedge-shaped male die to form a wedge-shaped workpiece. And extruding the pre-formed workpiece through the wedge-shaped male die to form a final formed workpiece.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of forming die, and particularly relates to a hot-thermal coupling extrusion forming die and method for an inner flange cabin component. BACKGROUND

[0002] The flange type part is generally formed by casting, forging or extrusion forming, and then the formed part is machined to obtain the final product.

[0003] For the part with an inner flange, the structure of the extrusion die used in the extrusion forming is complex, the forming process is complicated, the die processing and manufacturing cost is high, and the inner hole of the part is a stepped inner hole, which is difficult to form during extrusion processing, and thus necessary machining is required after the extrusion to obtain the final part, thereby causing waste of materials and reducing the utilization rate of the materials.

[0004] Therefore, it is urgent to provide a hot-thermal coupling extrusion forming die and method for an inner flange cabin component to solve the above problems. SUMMARY

[0005] Therefore, the purpose of the application is to provide a hot-thermal coupling extrusion forming die and method for an inner flange cabin component, which integrates heating in the die, integrates a water cooling channel in the water cooling ejection disc, and integrates a thermocouple in the die to monitor the die temperature in real time, so that the temperature field of the forging is accurately controlled by the temperature measurement and control system, the reverse temperature field gradient of the die-workpiece-die is formed, and the forming quality of the workpiece is ensured.

[0006] To achieve the above purpose, the application provides the following technical scheme: The application provides a hot-thermal coupling extrusion forming die for an inner flange cabin component, which comprises a die fixedly installed on a lower die plate and a punch fixedly installed on an upper die plate, a forming chamber matched with the punch is arranged in the die, a plurality of resistance heating wires surrounding the forming chamber are arranged in the die, a water cooling ejection disc is slidably arranged at the bottom wall of the die, a ejector rod penetrating through the lower die plate is fixedly arranged at the bottom end of the water cooling ejection disc, the ejector rod is slidably connected with the lower die plate, a water cooling channel is arranged in the water cooling ejection disc, cooling water is injected into the water cooling channel to cool the blank, the punch comprises a preforming punch and a wedge-shaped punch which are respectively fixedly installed on the upper die plate, in the first forming stage, the blank is extruded by the preforming punch to form a preformed workpiece, so that the inner wall of the preformed workpiece is cup-shaped, in the second forming stage, the preformed workpiece is extruded by the wedge-shaped punch to make the top wall of the preformed workpiece inwardly concave to form an inner flange, thereby forming a final formed workpiece.

[0007] Further, the wedge-shaped punch is fixedly installed on the upper die plate through a punch connecting piece, the punch connecting piece comprises a mounting plate fixedly connected with the upper die plate and a spline shaft fixedly connected with the bottom wall of the mounting plate, a plurality of limiting keys are fixedly arranged on the spline shaft in a circumferential direction with the spline shaft axis as the center, the wedge-shaped punch comprises a plurality of split punches in one-to-one sliding connection with the limiting keys, the split punch is provided with a sliding groove in sliding connection with the limiting key, the split punch and the limiting key in sliding connection can limit the displacement of the split punch in the radial direction of the spline shaft, and the split punch and the mounting plate are fixedly connected through bolts.

[0008] Further, the split punch is provided with six split punch groups, the wedge-shaped punch comprises two groups of split punch groups arranged in a semicircular shape, each group of split punch groups comprises two first split punches arranged in symmetry and a second split punch arranged between the two first split punches, and the cross section of the second split punch is in a conical shape, wherein the arc length of the arc-shaped wall of the second split punch away from the spline shaft is smaller than the arc length of the arc-shaped wall of the second split punch close to the spline shaft.

[0009] Further, the top wall of the water-cooled ejection disc is axially provided with a plurality of limiting notches with the water-cooled ejection disc axis as the center.

[0010] Further, the spline shaft is provided with a cavity, a support shaft is fixedly connected in the cavity, a sleeve rod capable of sliding in the axial direction of the support shaft is sleeved and limited on the support shaft, the outer wall of the sleeve rod is in a wave shape along the axial direction of the support shaft, a plurality of sliding grooves in communication with the cavity are circumferentially arranged on the inner wall of the spline shaft with the spline shaft axis as the center, a plurality of push rods capable of sliding in the radial direction of the spline shaft are arranged side by side in the sliding groove along the axial direction of the spline shaft, an arc-shaped block matched with the arc-shaped recess of the sleeve rod is fixedly connected to the push rod close to the sleeve rod, a knocking block is fixedly arranged at the end of the push rod away from the sleeve rod, a spring is fixedly connected between the arc-shaped block and the inner wall of the cavity, and one end of the sleeve rod is provided with a driving mechanism capable of driving the sleeve rod to reciprocally slide along the axial direction of the support shaft, and sliding the sleeve rod along the support shaft can synchronously squeeze a plurality of arc-shaped blocks arranged in a circumferential direction to drive the knocking block to knock the inner wall of the sliding groove.

[0011] Further, the punch connecting piece is provided with a mounting groove in communication with the cavity, the driving mechanism comprises a driving motor fixedly arranged in a rod shape on the top wall of the mounting groove, a reciprocating screw rod is fixedly connected to the output end of the driving motor, a positioning groove is arranged in the reciprocating screw rod, one end of the support shaft extends into the positioning groove and is rotationally connected with the reciprocating screw rod, a driving block in screw connection with the reciprocating screw rod is sleeved on the reciprocating screw rod, the driving block is in sliding connection with the inner wall of the mounting groove, and the driving block is fixedly connected with the sleeve rod.

[0012] Further, a sleeve capable of being limited and sliding along the axial direction of the spline shaft is slidingly connected to the inner wall of the cavity, a gap is arranged between the sleeve and the sleeve rod, the push rod is slidingly connected to the sleeve, and the spring is fixedly arranged between the arc block and the inner wall of the sleeve.

[0013] A forming method of an inner flange cabin component thermal coupling extrusion forming die, comprising the following steps: S1: after the blank is heated to 150-200 DEG C, the surface is coated with a water-based graphite lubricant; S2: the blank is heated to 390-410 DEG C and kept for 4-6 hours, and the temperature of the concave die is heated to 440-480 DEG C by resistance heating wire and kept for more than or equal to 6 hours; S3: the inner wall of the concave die and the surface of the convex die are coated with an oil-based graphite lubricant, and the heated blank is transferred into the concave die within 1 minute; S4: forming the first stage, moving the upper die plate provided with the preforming convex die to coaxially arrange the preforming convex die and the forming chamber, pressing the upper die plate to make the preforming convex die extrude the blank to form a preformed workpiece, and the extrusion rate is 5-15 mm / s, wherein the bottom wall thickness of the preformed workpiece is not less than 1.2 times the side wall thickness; S5: forming the second stage, removing the preforming convex die, moving the upper die plate provided with the wedge-shaped convex die to coaxially arrange the wedge-shaped convex die and the forming chamber, pressing the upper die plate to make the wedge-shaped convex die extrude the preformed workpiece, and the extrusion rate is 5-15 mm / s, so that the top wall of the preformed workpiece is inwardly recessed to form an inner flange to form a final forming workpiece; wherein, during the pressing process of the wedge-shaped convex die, the driving motor is started to drive the reciprocating wire rod to rotate, so as to drive the sleeve rod to slide along the support shaft in the axial direction to synchronously extrude the plurality of arc-shaped blocks arranged in the circumferential direction to push the knocking block to knock the inner wall of the spline shaft; S6: after the resistance heating wire is turned off, the final forming workpiece is rapidly cooled by injecting cooling water into the water cooling channel, and then the final forming workpiece is knocked out of the forming chamber by synchronously moving the ejector rod and the upper die plate, and the split convex die is taken out.

[0014] Further, when the split convex die is taken out, the bolts for fixing the split convex die on the mounting plate are disassembled, then the upper die plate is slid upward to drive the mounting plate and the spline shaft to separate from the wedge-shaped convex die, then the two second split convex dies are sequentially slid towards the center of the wedge-shaped convex die and taken out, and then the first split convex dies are sequentially taken out.

[0015] The beneficial effects of the present application are: The present application ensures the forming quality of the workpiece by integrating heating in the female die, integrating water cooling channels in the water-cooled ejection plate, and integrating thermocouples in the mold to monitor the mold temperature in real time, and the temperature measurement and control system accurately regulates the forging forming temperature field, forms the reverse temperature field gradient of the female die-workpiece-male die, to ensure the forming quality of the workpiece.

[0016] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, and it is intended to cover any alternatives, modifications, or equivalents included within the scope of the present application. The present application can achieve and obtain the above objects and other advantages, with the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the objects, technical solutions and beneficial effects of the present application clearer, the present application provides the following drawings for illustration: Figure 1 The structure sectional view of the first stage of the forming of the embodiment of the present application; Figure 2 The structure sectional view of the second stage of the forming of the embodiment of the present application, the wedge-shaped male die is downward extruded; Figure 3 The structure sectional view of the second stage of the forming of the embodiment of the present application, the final forming workpiece is extruded and formed; Figure 4 The structure sectional view of the final forming workpiece ejected by the water-cooled ejection plate of the embodiment of the present application; Figure 5 The structure schematic diagram of the split male die of the embodiment of the present application; Figure 6 The structure sectional view of the water-cooled ejection plate and the final forming workpiece of the embodiment of the present application; Figure 7 The connection structure sectional view of the male die connecting piece and the spline shaft of the embodiment of the present application; Figure 8 The structure schematic diagram of the spline shaft of the embodiment of the present application.

[0018] The following are the markings in the attached diagram: Lower template 1, Cavity 2, Forming chamber 201, Resistance heating wire 202, Upper template 3, Punch 4, Pre-forming punch 401, Wedge punch 402, Annular notch 4021, Punch connector 403, Mounting plate 404, Spline shaft 405, Limiting key 406, First segment punch 407, Second segment punch 408, Cavity 409, Support shaft 410, Sleeve rod 411, Slide groove 412, Push rod 413, Arc block 414, Striking block 415, Spring 416, Mounting groove 417, Drive motor 418, Reciprocating screw 419, Positioning groove 420, Drive block 421, Sleeve 422, Water-cooled ejector plate 5, Ejector rod 501, Water-cooling channel 502, Limiting notch 503, Pre-formed workpiece 6, Inner flange 601, Final formed workpiece 7. Detailed Implementation

[0019] like Figures 1-8 As shown, the present invention provides a thermo-coupling extrusion forming die for an inner flange cabin component, comprising: a concave die 2 fixedly mounted on a lower template 1 and a convex die 4 fixedly mounted on an upper template 3. The concave die 2 is provided with a forming chamber 201 that cooperates with the convex die 4. Multiple resistance heating wires 202 surrounding the forming chamber 201 are provided within the concave die 2. A water-cooled ejector plate 5 is slidably disposed on the bottom wall of the concave die 2. A push rod 501 penetrating the lower template 1 is fixedly disposed at the bottom end of the water-cooled ejector plate 5. The push rod 501 is slidably connected to the lower template 1. The water-cooled ejector plate 5 is provided with... The water-cooling channel 502 is used to cool the blank by injecting circulating water into the water-cooling channel 502. The punch 4 includes a pre-forming punch 401 and a wedge punch 402 respectively installed on the upper template 3. The pre-forming punch 401 is frustum shaped. The top wall of the wedge punch 402 is provided with an annular notch 4021. In the first forming stage, the blank is extruded by the pre-forming punch 401 to form a pre-formed workpiece 6. In the second forming stage, the pre-formed workpiece 6 is extruded by the wedge punch 402 to make the blank fill the annular notch 4021 to form an inner flange 601 to form the final formed workpiece 7.

[0020] In this solution, heating is integrated into the die 2, water cooling channel 502 is integrated into the water-cooled ejector plate 5, and thermocouples are integrated into the mold to monitor the mold temperature in real time. The temperature measurement and control system precisely regulates the forming temperature field of the forging, forming a reverse temperature field gradient of die-workpiece-punch to ensure the forming quality of the workpiece. During the extrusion forming process, the die temperature > workpiece temperature > punch temperature, forming a reverse forming temperature field. The temperature is precisely controlled by thermocouple and PLC feedback adjustment, and the forming quality of the workpiece is ensured through thermo-mechanical coupling.

[0021] The scheme is locally heated by arranging the resistance heating wire 202 around the forming chamber 201, reduces the flow resistance of the blank in the region of the die 2, significantly improves the plastic deformation ability of the material, promotes the material to fill the mold cavity (especially the complex feature area such as the inner flange) more smoothly and fully, effectively reduces the filling defects such as insufficient filling caused by poor material flow, and the like, and the water cooling channel 502 is arranged in the water cooling ejector plate 5 at the bottom to make the surface layer of the blank quickly cool and harden, significantly reduce the sticking phenomenon, and reduce the deformation risk and wear rate at high temperature; wherein the die temperature > workpiece temperature > punch temperature, the blank is driven to flow from the high-temperature (low-strength, high-plasticity) die region to the low-temperature (high-strength, low-plasticity) punch region, effectively inhibiting defects such as cracks, folds or uneven deformation of the blank during forming.

[0022] In an embodiment of the present application, the wedge-shaped punch 402 is fixedly installed on the upper die plate 3 through a punch connecting piece 403, the punch connecting piece 403 includes a mounting plate 404 fixedly connected with the upper die plate 3 and a spline shaft 405 fixedly connected with the bottom wall of the mounting plate 404, a plurality of limiting keys 406 are fixedly arranged on the spline shaft 405, the wedge-shaped punch 402 includes a plurality of split punches in one-to-one sliding connection with the limiting keys 406, the split punches are provided with sliding grooves in sliding connection with the limiting keys 406, the split punches are in sliding connection with the limiting keys 406 to limit the displacement of the split punches in the radial direction of the spline shaft 405, and the split punches are fixedly connected with the mounting plate 404 through bolts.

[0023] In the present scheme, the split punch is provided so as to be convenient to take out after the inner flange 601 is formed.

[0024] In an embodiment of the present application, the split punch is provided with six split punch groups, the wedge-shaped punch 402 includes two groups of split punch groups arranged in a semicircle, each group of split punch groups includes two symmetrically arranged first split punches 407 and a second split punch 408 arranged between the two first split punches 407, and the cross section of the second split punch 408 is conical, wherein the arc length of the arc-shaped wall of the second split punch 408 away from the spline shaft 405 is smaller than the arc length of the arc-shaped wall of the second split punch 408 close to the spline shaft 405.

[0025] In the present scheme, through the above structure, when the split punch is taken out, the second split punch 408 can be first slid out between the two first split punches 407, and then the first split punches 407 are taken out in sequence.

[0026] In one embodiment of the present application, the top wall of the water-cooled knockout disc 5 is provided with a plurality of limiting notches 503 circumferentially arranged around the axis of the water-cooled knockout disc 5, so as to limit the horizontal displacement of the final formed workpiece 7 during the process of ejecting the final formed workpiece 7 out of the molding chamber 201 by the water-cooled knockout disc 5.

[0027] In one embodiment of the present application, the spline shaft 405 is provided with a cavity 409, a support shaft 410 is fixedly connected in the cavity 409, a sleeve rod 411 capable of sliding axially along the support shaft 410 is sleeved and limited on the support shaft 410, the outer wall of the sleeve rod 411 is wavy along the axis direction of the support shaft 410, a plurality of sliding grooves 412 communicating with the cavity 409 are circumferentially arranged on the inner wall of the spline shaft 405 around the axis of the spline shaft 405, a plurality of push rods 413 capable of sliding limitally along the radial direction of the spline shaft 405 are side by side arranged in the sliding grooves 412 along the axis direction of the spline shaft 405, an arc-shaped block 414 matched with the arc-shaped concave surface of the sleeve rod 411 is fixedly arranged on the side close to the sleeve rod 411 of the push rod 413, a knocking block 415 is fixedly arranged on the end away from the sleeve rod 411 of the push rod 413, a spring 416 is fixedly connected between the arc-shaped block 414 and the inner wall of the cavity 409, one end of the sleeve rod 411 is provided with a driving mechanism capable of driving the sleeve rod 411 to reciprocate along the axis direction of the support shaft 410, and the sleeve rod 411 sliding along the support shaft 410 can synchronously extrude the plurality of arc-shaped blocks 414 circumferentially arranged to push the knocking block 415 to knock the inner wall of the sliding groove 412.

[0028] In the present scheme, during the second forming stage, the sleeve rod 411 is driven to reciprocate by the driving mechanism, thereby pushing the plurality of arc-shaped blocks 414 circumferentially arranged to reciprocate along the radial direction of the spline shaft 405, so as to drive the knocking block 415 to knock the inner wall of the sliding groove 412, i.e. the spline shaft 405, through the push rod 413, so that the vibration force generated by the knocking is transmitted to the pre-formed workpiece 6, so as to reduce the effective friction coefficient between the blank and the surface of the mold cavity, improve the filling performance of the material, facilitate the filling of the annular notch 4021, and ensure the formation of the inner flange.

[0029] In one embodiment of the present application, the punch connecting piece 403 is provided with a mounting groove 417 communicating with the cavity 409, the driving mechanism comprises a driving motor 418 fixedly mounted on the top wall of the mounting groove 417, a reciprocating screw rod 419 is fixedly connected to the output end of the driving motor 418, a positioning groove 420 is arranged in the reciprocating screw rod 419, one end of the support shaft 410 extends into the positioning groove 420 and is rotationally connected with the reciprocating screw rod 419, a driving block 421 threadedly connected with the reciprocating screw rod 419 is sleeved on the reciprocating screw rod 419, the driving block 421 is slidingly connected with the inner wall of the mounting groove 417, and the driving block 421 is fixedly connected with the sleeve rod 411.

[0030] In the scheme, the driving motor 418 is started to drive the reciprocating screw rod 419 to rotate, thereby driving the driving block 421 to reciprocate along the axis direction of the support shaft 410, thereby driving the sleeve rod 411 to reciprocate along the axis direction of the support shaft 410. The driving mechanism is arranged in the mounting groove 417 to avoid heat generated during the movement of the driving mechanism from being transferred to the wedge-shaped punch 402. There is a gap between the sleeve rod 411 and the inner wall of the spline shaft 405, which reduces heat transfer and ensures the heat regulation of the resistance heating wire 202 in the die 2. During the fixing and installation of the punch connecting piece 403 and the spline shaft 405, the support shaft 410 is positioned and installed in the positioning groove 420.

[0031] In an embodiment of the present application, a sleeve 422 capable of limiting sliding along the axis direction of the spline shaft 405 is slidingly connected to the inner wall of the cavity 409. A gap is provided between the sleeve 422 and the sleeve rod 411. The push rod 413 is slidingly connected to the sleeve 422. The spring 416 is fixedly arranged between the arc-shaped block 414 and the inner wall of the sleeve 422.

[0032] In the scheme, by arranging the sleeve 422, all the knocking blocks 415, push rods 413, arc-shaped blocks 414 and springs 416 can be taken out by sliding the sleeve 422 along the axis direction of the spline shaft 405, which facilitates the installation, disassembly and replacement of the knocking assembly and facilitates the machining of the spline shaft 405.

[0033] A method for thermally coupling and extruding an inner flange cabin component, comprising the following steps: S1: heating the blank to 150-200℃ and then applying water-based graphite lubricant to its surface; S2: heating the blank to 390-410℃ and keeping it for 4-6h, and heating the temperature of the die 2 to 440-480℃ by the resistance heating wire 202 and keeping it for a time ≥6h; S3: coating the inner wall of the die 2 and the surface of the punch 4 with oil-based graphite lubricant, and then transferring the heated blank into the die 2 within 1min; S4: forming the first stage, moving the upper die plate 3 provided with the preforming punch 401 to coaxially arrange the preforming punch 401 with the forming chamber 201, and pressing the upper die plate 3 to make the preforming punch 401 extrude the blank to form a preformed workpiece 6 at an extrusion rate of 5-15mm / s. The bottom wall thickness of the preformed workpiece 6 is not less than 1.2 times the side wall thickness. S5: the second forming stage, the preformed punch 401 is taken out, the upper die plate 3 provided with the wedge-shaped punch 402 is moved to coaxially arrange the wedge-shaped punch 402 with the forming chamber 201, the wedge-shaped punch 402 is extruded to the preformed workpiece 6 by pressing the upper die plate 3, the extrusion rate is 5-15 mm / s, so that the top wall of the preformed workpiece 6 is inwardly concave to form the inner flange 601 to form the final formed workpiece 7; wherein, during the pressing process of the wedge-shaped punch 402, the driving motor 418 is started to drive the reciprocating screw rod 419 to rotate, so as to drive the sleeve rod 411 to axially slide along the support shaft 410 to synchronously extrude the plurality of arc-shaped blocks 414 arranged in the circumference to push the knocking block 415 to knock the inner wall of the spline shaft 405; S6: the resistance heating wire 202 is turned off, the final formed workpiece 7 is rapidly cooled by injecting cooling water into the water cooling channel 502, and then the final formed workpiece 7 is pushed out of the forming chamber 201 by the ejector rod 501 after the water-cooled ejector plate 5 is pushed out, and the split punch is taken out, wherein the ejector rod 501 and the upper die plate 3 are synchronously moved upward by the moving mechanism; wherein, when the split punch is taken out, the bolts used for fixing the split punch on the mounting plate 404 are disassembled first, then the upper die plate 3 is slid upward to drive the mounting plate 404 and the spline shaft 405 to be separated from the wedge-shaped punch 402, and then the two second split punches 408 are sequentially slid to the direction close to the center of the wedge-shaped punch 402 and are taken out, and then the first split punch 407 is sequentially taken out.

[0034] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A thermo-coupling extrusion forming die for an inner flange cabin component, comprising a concave die fixedly mounted on a lower template and a convex die fixedly mounted on an upper template, characterized in that: The die cavity is provided with a forming chamber that cooperates with the punch. The die cavity is provided with multiple resistance heating wires surrounding the forming chamber. A water-cooled ejector plate is slidably provided on the bottom wall of the die cavity. A push rod is fixedly provided at the bottom end of the water-cooled ejector plate, penetrating the lower template. The push rod is slidably connected to the lower template. A water-cooling channel is provided in the water-cooling ejector plate. Cooling water is injected into the water-cooling channel to circulate and cool the blank. The punch includes a pre-forming punch and a wedge punch respectively fixedly installed on the upper template. In the first forming stage, the pre-forming punch extrudes the blank to form a pre-formed workpiece. Therefore, the inner wall of the pre-formed workpiece is cup-shaped. In the second forming stage, the wedge punch extrudes the pre-formed workpiece to make the top wall of the pre-formed workpiece recessed inward to form an inner flange to form the final formed workpiece.

2. The thermo-coupling extrusion forming die for the inner flange cabin component according to claim 1, characterized in that: The wedge-shaped punch is fixedly mounted on the upper template via a punch connector. The punch connector includes a mounting plate fixedly connected to the upper template and a spline shaft fixedly connected to the bottom wall of the mounting plate. Multiple limit keys are fixedly arranged circumferentially on the spline shaft with the spline shaft axis as the center. The wedge-shaped punch includes multiple segmented punches that are slidably connected to the limit keys one by one. The segmented punches are provided with grooves that slidably engage with the limit keys. The slidable connection between the segmented punches and the limit keys can limit the displacement of the segmented punches along the radial direction of the spline shaft. The segmented punches are fixedly connected to the mounting plate by bolts.

3. The thermo-coupling extrusion forming die for the inner flange cabin component according to claim 2, characterized in that: The segmented punch is provided in six parts. The wedge-shaped punch includes two sets of segmented punch groups arranged in a semi-circular manner. Each set of segmented punch groups includes two symmetrically arranged first segmented punches and a second segmented punch disposed between the two first segmented punches. The cross-section of the second segmented punch is conical. The arc length of the arc wall of the second segmented punch away from the spline axis is smaller than the arc length of the arc wall of the second segmented punch close to the spline axis.

4. The thermo-coupling extrusion forming die for the inner flange cabin component according to claim 3, characterized in that: The top wall of the water-cooled ejector plate has multiple limiting notches axially centered on the axis of the water-cooled ejector plate.

5. The thermo-coupling extrusion forming die for the inner flange cabin component according to claim 4, characterized in that: The splined shaft has a cavity, and a support shaft is fixedly connected inside the cavity. A sleeve rod that can slide along the axial direction of the support shaft is slidably fitted onto the support shaft. The outer wall of the sleeve rod is wavy along the axial direction of the support shaft. The inner wall of the splined shaft has multiple grooves circumferentially arranged around the splined shaft axis that communicate with the cavity. Multiple push rods that can slide in the radial direction of the splined shaft are arranged side by side in the grooves. An arc-shaped block that mates with the arc-shaped concave surface of the sleeve rod is fixedly connected to the push rod near the sleeve rod. A striking block is fixedly arranged at the end of the push rod away from the sleeve rod. A spring is fixedly connected between the arc-shaped block and the inner wall of the cavity. One end of the sleeve rod is provided with a driving mechanism that can drive the sleeve rod to reciprocate along the axial direction of the support shaft. Sliding the sleeve rod along the support shaft can simultaneously squeeze the multiple circumferentially arranged arc-shaped blocks to push the striking block to strike the inner wall of the groove.

6. The thermo-coupling extrusion forming die for the inner flange cabin component according to claim 5, characterized in that: The punch connector has an installation groove communicating with the cavity. The driving mechanism includes a drive motor fixed to the top wall of the installation groove. The output end of the drive motor is fixedly connected to a reciprocating lead screw. The reciprocating lead screw has a positioning groove. One end of the support shaft extends into the positioning groove and is rotatably connected to the reciprocating lead screw. A drive block is sleeved on the reciprocating lead screw and threadedly connected to the reciprocating lead screw. The drive block is slidably connected to the inner wall of the installation groove and is fixedly connected to the sleeve rod.

7. The thermo-coupling extrusion forming die for the inner flange cabin component according to claim 6, characterized in that: The inner wall of the cavity is slidably connected to a sleeve that can slide and limit the movement along the spline axis. A gap is provided between the sleeve and the sleeve rod. The push rod is slidably connected to the sleeve. The spring is fixedly disposed between the arc-shaped block and the inner wall of the sleeve.

8. The forming method of the thermo-coupled extrusion forming die for the inner flange cabin component according to any one of claims 1-7, characterized in that, Includes the following steps: S1: After heating the billet to 150-200℃, apply a water-based graphite lubricant to its surface; S2: Heat the billet to 390-410℃ and hold it for 4-6 hours, and heat the die temperature to 440-480℃ and hold it for ≥6 hours using a resistance heating wire; S3: Apply oil-based graphite lubricant to the inner wall of the die cavity and the surface of the punch, and then transfer the heated blank into the die cavity within 1 minute; S4: In the first stage of forming, the upper template on which the preforming punch is installed is moved until the preforming punch is coaxial with the forming chamber. The upper template is pressed down to make the preforming punch extrude the blank to form a preformed workpiece. The extrusion rate is 5 to 15 mm / s. The bottom wall thickness of the preformed workpiece is not less than 1.2 times the side wall thickness. S5: In the second forming stage, the pre-forming punch is removed, and the upper template with the wedge punch is moved until the wedge punch is coaxial with the forming chamber. The upper template is pressed down to make the wedge punch extrude the pre-forming workpiece at a rate of 5-15 mm / s, so that the top wall of the pre-forming workpiece is recessed inward to form an inner flange to form the final formed workpiece. During the pressing down of the wedge punch, the drive motor is started to drive the reciprocating screw to rotate, thereby driving the sleeve to slide along the support shaft axially to simultaneously extrude multiple circumferentially arranged arc blocks to push the striking block to strike the inner wall of the spline shaft. S6: After turning off the resistance heating wire and rapidly cooling the final molded workpiece by injecting cooling water into the water cooling channel, the final molded workpiece is ejected from the molding chamber by synchronously moving the ejector rod and the upper template, and then the segmented punch is removed.

9. The forming method of the thermo-coupling extrusion forming die for the inner flange cabin component according to claim 8, characterized in that, When removing the segmented punch, first remove the bolts used to fix the segmented punch to the mounting plate, then slide the upper template upward to drive the mounting plate and spline shaft away from the wedge punch, then slide the two second segmented punches in sequence towards the center of the wedge punch and remove them, and then remove the first segmented punch in sequence.

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