A local heating based deconstructive spreading incremental forming apparatus

Abstract

The application relates to a local heating-based deconstruction spreading progressive forming device and belongs to the technical field of metal forming. The device solves the problems of low material utilization rate and long forming cycle of metal parts in the prior art. The device comprises a workbench and a hot forming device. The workbench is used for bearing a metal workpiece to be processed. The hot forming device is installed on the workbench. The hot forming device comprises an adjusting roller and an adjusting motor. The adjusting motor is used for driving the adjusting roller to displace. When the adjusting roller displaces, the adjusting roller can apply a pulling force to the metal workpiece, so that the metal workpiece is pushed to deform in spreading. The application realizes multi-point spreading forming of the metal workpiece.

Description

Technical Field

[0001] This invention relates to the field of metal forming technology, and in particular to a deconstruction and expansion progressive forming apparatus based on local heating. Background Technology

[0002] Hot forming plays an important role in the aerospace field as a metal forming method; integral forming materials such as the main load-bearing end frames, skeletons, and bulkheads of rockets, fighter jets, and missiles are mostly manufactured using hot forming methods.

[0003] Existing forming methods suffer from low material utilization, difficulty in controlling the uniformity of material microstructure and properties during forming, high equipment requirements, and long manufacturing cycles. Metal deconstruction and expansion forming technology decomposes or disassembles the structural features of a product and rearranges them, then projects them into a very small planar configuration. Process separation and connection zones are prepared on the pre-made blank, and external forces are applied in the designated areas at appropriate times to expand the blank until the product with the corresponding structural configuration is obtained. This is a material-saving and labor-saving near-net-shape forming manufacturing method.

[0004] Therefore, this application provides a deconstruction and expansion progressive forming apparatus based on local heating to solve the above problems. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a deconstruction and expansion progressive forming device based on local heating to solve the problems of low material utilization and long forming cycle of existing metal parts forming.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] A deconstruction and expansion progressive forming device based on local heating includes: a worktable and a thermoforming device; the worktable is used to support the metal workpiece to be processed; the thermoforming device is mounted on the worktable; the thermoforming device is provided with one or more; the thermoforming device includes: an adjusting roller and an adjusting motor; the adjusting motor is used to drive the adjusting roller to a certain displacement; when the adjusting roller is displaced, it can apply a tensile force to the metal workpiece, thereby pushing the metal workpiece to undergo expansion deformation.

[0008] Furthermore, it also includes: a robotic arm; the end effector of the robotic arm is a mechanical gripper; the mechanical gripper is used to hold the metal workpiece.

[0009] Furthermore, a heating device is also provided on the workbench; the heating device is used to heat the metal workpiece.

[0010] Furthermore, the adjusting roller is rotatably mounted on the outside of the bushing; the bushing is provided with an internal thread and is threadedly connected to the screw through the internal thread; the screw is fixedly connected to the output shaft of the adjusting motor; the adjusting motor is a rotary motor.

[0011] Furthermore, a positioning platform is provided below the worktable; two parallel slide rails are fixedly installed on the positioning platform; the bushing is slidably mounted on the slide rails; when the adjusting motor drives the screw to rotate, the bushing slides linearly relative to the slide rails.

[0012] Furthermore, the inner wall of the slide rail is provided with a T-shaped groove; the two sides of the bushing are provided with T-shaped sliders; the T-shaped sliders are slidably installed in the T-shaped groove.

[0013] Furthermore, the worktable is provided with an adjustment opening; the adjustment roller protrudes from the upper surface of the worktable at the adjustment opening.

[0014] Furthermore, the thermoforming apparatus further includes: a first roll and a second roll; the first roll and the second roll are arranged parallel to each other and perpendicular to the upper surface of the worktable; a fixed seat parallel to the positioning table is arranged above the worktable; the first roll and the second roll are rotatably mounted between the positioning table and the fixed seat; when the adjusting motor drives the adjusting roll to move, the adjusting roll moves closer to or further away from the first roll and the second roll.

[0015] Furthermore, the first roll and the second roll are connected to the drive motor via a speed reducer; the first roll and the second roll can rotate synchronously under the drive of the drive motor.

[0016] A method for forming metal parts, employing the deconstruction and expansion thermoforming equipment of the present invention.

[0017] The technical solution of this invention can achieve at least one of the following effects:

[0018] 1. The present invention provides a deconstruction and expansion progressive forming device based on localized heating. By adjusting the rollers to stretch a pre-formed metal part at a high temperature, the device achieves shape adjustment and expansion of the metal workpiece, significantly improving the material utilization rate of the parts to 30% or more, which is more than 5 times higher than that of traditional forging processes. This greatly reduces raw material costs, especially for high-value metals such as titanium alloys and high-temperature alloys. Furthermore, the amount of finishing work required is also significantly reduced, saving substantial machining costs.

[0019] 2. The deconstruction and expansion progressive forming equipment based on local heating of the present invention adjusts the displacement of the rollers by adjusting the motor, and at the same time, the workpiece is grasped and positioned by the robotic arm. It has a high degree of automation, greatly reduces the intensity of manual labor, improves production efficiency, and improves the stability and pass rate of product quality.

[0020] 3. The deconstruction and expansion progressive forming equipment based on local heating of the present invention expands and shapes a metal workpiece by creating a through hole inside the workpiece and then using the tension of a robotic arm and adjusting rollers. This lays the equipment foundation for the thermoforming of frame-like structural parts and provides a forming method for complex and difficult-to-form parts.

[0021] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0022] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0023] Figure 1 This is a schematic diagram of the deconstruction expansion progressive forming device based on local heating according to Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the thermoforming apparatus structure of the deconstruction expansion progressive forming equipment based on local heating according to Embodiment 1 of the present invention.

[0025] Figure 3 This is a diagram showing the usage state of the deconstruction expansion progressive forming device based on local heating according to Embodiment 1 of the present invention;

[0026] Figure 4 This is a diagram illustrating the usage state of the deconstruction expansion progressive forming device based on local heating, according to Embodiment 2 of the present invention.

[0027] Figure 5 This is a schematic diagram of the adjusting roller assembly of the deconstruction spreading progressive forming device based on local heating in Embodiment 2 of the present invention;

[0028] Figure 6 This is a diagram showing the usage state of the expanding cam of the locally heated deconstruction expanding incremental forming device of Embodiment 2 of the present invention, which expands a metal part.

[0029] Figure 7This is a schematic diagram of the adjusting roller assembly of the deconstruction spreading progressive forming device based on local heating in Embodiment 3 of the present invention;

[0030] Figure 8 This is a schematic diagram of the unfolded state of the adjustment roller assembly of the deconstruction and expansion progressive forming device based on local heating in Embodiment 3 of the present invention.

[0031] Figure 9 This is a schematic diagram of a prefabricated structure for a ring-shaped workpiece;

[0032] Figure 10 for Figure 9 A schematic diagram of the expanded forming state of the preform in the diagram;

[0033] Figure 11 This is a schematic diagram of a prefabricated component structure with internal wall features;

[0034] Figure 12 for Figure 11 A schematic diagram of the expanded forming state of the preform in the diagram;

[0035] Figure 13 This is a schematic diagram of a prefabricated component structure with an outer wall feature;

[0036] Figure 14 for Figure 13 A schematic diagram of the expanded forming state of the preform.

[0037] Figure label:

[0038] 1-Workbench; 2-Thermoforming device; 21-First roll; 22-Second roll; 23-Adjusting roll; 24-Positioning table; 25-Adjusting motor; 27-Drive motor; 26-Reducer unit; 231-Adjusting platform; 232-Rotating shaft; 233-Expanding cam; 234-Support frame; 235-Expanding motor; 236-First gear; 237-Second gear; 241-Screw; 242-Slide rail; 243-Busset; 244-Fixed seat; 251-First boss; 252-Second boss; 253-First rotating shaft; 254-Second rotating shaft; 3-Robot arm; 31-Robot arm slide rail; 4-Heating device; 5-Metal workpiece. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0040] Example 1

[0041] One specific embodiment of the present invention discloses a deconstruction spreading progressive forming apparatus based on local heating, such as... Figure 1, Figure 2 , Figure 3 As shown, it includes: a worktable 1 and a thermoforming device 2; the worktable 1 is used to support the metal workpiece 5 to be processed; the thermoforming device 2 is mounted on the worktable 1; the thermoforming device 2 is provided with one or more; the thermoforming device 2 includes: an adjusting roller 23 and an adjusting motor 25; the adjusting motor 25 is used to drive the adjusting roller 23 to move; when the adjusting roller 23 moves, it can apply a tensile force to the metal workpiece 5, thereby pushing the metal workpiece 5 to undergo expansion and deformation.

[0042] Furthermore, it also includes: a robotic arm 3; the end effector of the robotic arm 3 is a mechanical gripper; the mechanical gripper is used to hold the metal workpiece 5. The base of the robotic arm 3 is slidably mounted on the robotic arm slide rail 31, and can be driven by a motor, pneumatic or hydraulic means to slide along the robotic arm slide rail 31. The robotic arm 3 controls the mechanical gripper to advance, retreat and rotate the metal workpiece 5 through a built-in automatic control program, and performs multi-point stretching by adjusting the rollers 23 to achieve the final formed shape and size. After forming is completed, the workpiece is unloaded.

[0043] Furthermore, a heating device 4 is also provided on the workbench 1; the heating device 4 is used to heat the metal workpiece 5. The heating device 4 is used to heat the part to the thermoforming temperature.

[0044] In this invention, one or more heating devices 4 are set on the workbench 1; setting multiple heating devices 4 can simultaneously heat the metal workpiece 5 at multiple points; thereby improving the temperature rise efficiency and thermoforming efficiency of the metal workpiece 5.

[0045] Furthermore, the adjusting roller 23 is rotatably mounted on the outside of the bushing 243; the bushing 243 is provided with an internal thread and is threadedly connected to the screw 241 through the internal thread; the screw 241 is fixedly connected to the output shaft of the adjusting motor 25; the adjusting motor 25 is a rotary motor.

[0046] Furthermore, a positioning platform 24 is provided below the workbench 1; two parallel slide rails 242 are fixedly provided on the positioning platform 24; the bushing 243 is slidably mounted on the slide rails 242; when the adjusting motor 25 drives the screw 241 to rotate, the bushing 243 slides linearly relative to the slide rails 242.

[0047] Alternatively, the adjusting motor 25 can be a linear motor, which can directly drive the adjusting roller 23 to move; or a hydraulic cylinder can be used as the driving component to drive the adjusting roller 23 to move.

[0048] In this invention, the adjusting motor 25 is connected to the bushing via a screw 241. By controlling the forward or reverse rotation of the adjusting motor 25, the screw 241 can be driven to rotate forward or reverse. The screw 241 and the bushing 243 are connected by a thread. When the screw 241 rotates, it can drive the bushing 243 to slide along the slide rail 242, thereby realizing the displacement of the adjusting roller 23.

[0049] Furthermore, the inner wall of the slide rail 242 is provided with a T-shaped groove; the two sides of the bushing 243 are provided with T-shaped sliders; the T-shaped sliders are slidably installed in the T-shaped groove.

[0050] In this invention, a lead screw pair is formed between the screw 241, the bushing 243, and the slide rail 242. When the screw 241 rotates, it can drive the T-shaped sliders on both sides of the bushing 243 to slide in the T-shaped groove, thereby adjusting the displacement of the roller 23.

[0051] Furthermore, the worktable 1 is provided with an adjustment opening; the adjustment roller 23 protrudes from the upper surface of the worktable at the adjustment opening.

[0052] like Figure 1 , Figure 3 As shown, the adjustment opening is a rectangular hole; the adjustment roller 23 is set in the adjustment opening, so that when the metal workpiece 5 is placed on the worktable 1, the adjustment roller 23 can extend into the inside of the metal workpiece 5, as shown. Figure 3 As shown.

[0053] Furthermore, the thermoforming apparatus 2 further includes: a first roll 21 and a second roll 22; the first roll 21 and the second roll 22 are arranged parallel to each other and perpendicular to the upper surface of the worktable 1; a fixed seat 244 parallel to the positioning table 24 is arranged above the worktable 1; the first roll 21 and the second roll 22 are both rotatably mounted between the positioning table 24 and the fixed seat 244; when the adjusting motor 25 drives the adjusting roll 23 to move, the adjusting roll 23 moves closer to or further away from the first roll 21 and the second roll 22.

[0054] During operation, the metal workpiece 5 is placed on the worktable 1. The first roll 21 and the second roll 22 are located outside the metal workpiece 5, and the adjusting roll 23 is located inside the metal workpiece 5. When the adjusting roll 23 is displaced, the metal workpiece 5 can be clamped between the first roll 21, the second roll 22, and the adjusting roll 23. For annular workpieces with no features on their inner and outer surfaces, the rotation of the first roll 21, the second roll 22, and the adjusting roll 23 can roll the metal workpiece 5, thereby obtaining an annular workpiece, such as... Figure 3 , Figure 9 , Figure 10 As shown.

[0055] Furthermore, the first roll 21 and the second roll 22 are connected to the drive motor 27 via a reducer 26; the first roll 21 and the second roll 22 can rotate synchronously under the drive of the drive motor 27.

[0056] In one specific embodiment of the present invention, when the robotic arm 3 clamps the metal workpiece 5, adjusting the displacement of the roller 23 can stretch and expand the metal workpiece 5; by adjusting the position of the metal workpiece 5 by the robotic arm 3, and by adjusting the roller 23 to stretch different positions of the metal workpiece 5, the workpiece can be formed by inching; when the robotic arm 3 releases the metal workpiece 5, and the first roller 21, the second roller 22 and the adjusting roller 23 rotate, the metal workpiece 5 can be partially rolled, thereby achieving the rolling forming of the metal workpiece 5.

[0057] Example 2

[0058] A specific embodiment of the present invention is an improvement upon embodiment 1:

[0059] like Figure 4 As shown, in this embodiment, an adjusting roller assembly is used as an alternative structure to the adjusting roller 23.

[0060] In this embodiment, the adjusting roller assembly is displaced by adjusting the motor 25, thereby stretching and expanding the metal workpiece 5 through the adjusting roller assembly. Figure 4 As shown.

[0061] Specifically, such as Figure 5 , Figure 6 As shown, the adjusting roller assembly includes: an adjusting platform 231, a rotating shaft 232, an expanding cam 233, and an expanding motor 235; the adjusting platform 231 is connected to the adjusting motor 25 and can be displaced under the drive of the adjusting motor 25; the expanding motor 235 is fixedly mounted on the adjusting platform 231 and can drive the rotating shaft 232 to rotate; one end of the rotating shaft 232 is fixedly connected to the output shaft of the adjusting motor 25, and the other end passes through the adjusting platform 231 and is fixedly connected to the expanding cam 233; so that the expanding motor 235 can drive the expanding cam 233 to rotate.

[0062] like Figure 5 As shown, the expansion motor 235 is fixedly connected to the adjustment platform 231 via a support frame 234. Specifically, the support frame 234 is arranged perpendicular to the adjustment platform 231 and is fixedly connected to the adjustment platform 231 by welding or bolts. The expansion motor 235 is fixedly mounted on the side of the support frame 234 by welding or bolts.

[0063] Specifically, the output shaft of the expansion motor 235 is perpendicular to the lower surface of the adjustment platform 231; the rotating shaft 232 is rotatably mounted in the adjustment platform 321 through bearings, and its two ends pass through the adjustment platform 231 and are fixedly connected to the output shaft of the expansion motor 235 and the expansion cam 233, respectively.

[0064] like Figure 5 , Figure 6 As shown, the expanding cam 233 is crescent-shaped and its middle part is fixedly connected to the rotating shaft 232.

[0065] Specifically, such as Figure 5 As shown, the outer surface of the expanding cam 233 is an arc surface, and the distance between the outer surface of the expanding cam 233 and the axis of the rotating shaft 232 gradually increases from the center to both sides.

[0066] like Figure 5 , Figure 6 As shown, when the expanding motor 235 drives the expanding cam 233 to reciprocate left and right, the outer arc surface of the expanding cam 233 gradually squeezes the metal workpiece 5, which can expand the inner side of the metal workpiece 5 into an arc surface with a diameter larger than the outer side diameter of the expanding cam 233.

[0067] During implementation, the adjustment motor 25 drives the adjustment roller assembly to move, while the mechanical arm 3 assists in clamping, which enables the stretching of the metal workpiece 5. When the expansion cam 233 stretches the metal workpiece 5, the middle part of the expansion cam 233 contacts the inner wall surface of the metal workpiece 5, thereby driving the adjustment platform 231 to move with the adjustment motor 25, and the expansion cam 233 moves synchronously to achieve the stretching of the metal workpiece 5.

[0068] Furthermore, when the expanding motor 235 drives the expanding cam 233 to deflect to the left, it can expand the left side of the metal workpiece 5; when the expanding motor 235 drives the expanding cam 233 to deflect to the right, it can expand the right side of the metal workpiece 5.

[0069] In this embodiment, the expanding motor 235 drives the expanding cam 233 to deflect left and right, which expands the left and right sides of the contact area between the metal workpiece 5 and the expanding cam 233. After the expansion is completed, the outer surface of the expanding cam 233 is in a state of near tangency with the inner wall surface of the metal workpiece 5. Figure 6 As shown.

[0070] In this invention, for the local small-angle included position of the metal workpiece 5, the rotation of the expanding cam 233 can expand the local position of the metal workpiece 5 to both sides; the left and right deflection of the expanding cam 233 can realize the expansion of the local included position and the expansion of the local protrusion formed during the workpiece stretching process, thereby improving the smoothness of the formed workpiece.

[0071] Example 3

[0072] One specific embodiment of the present invention is an improvement upon embodiment 2:

[0073] In this embodiment, the expanding cam 233 in Embodiment 2 is designed as a split structure. Specifically, in this embodiment, the expanding cam 233 in Embodiment 2 is replaced by a combination of the first boss 251 and the second boss 252.

[0074] like Figure 7 , Figure 8 As shown, the first boss 251 and the second boss 252 have the same shape and are arranged symmetrically.

[0075] like Figure 7 , Figure 8 As shown, the adjusting roller assembly of this embodiment includes: a first boss 251, a second boss 252, a first rotating shaft 253, a second rotating shaft 254, a first gear 236, a second gear 237, and an expansion motor 235.

[0076] Specifically, the expansion motor 235 is fixedly mounted on the adjustment platform 231, and the output shaft of the expansion motor 235 is fixedly connected to the first gear 236; the first gear 236 and the second gear 237 mesh and drive each other and rotate in opposite directions.

[0077] Specifically, the expansion motor 235 is fixedly installed below the adjustment platform 231 by a support frame 234; the first rotating shaft 253 and the second rotating shaft 254 are both installed through the adjustment platform 231 and are rotatably installed on the adjustment platform 231 by bearings.

[0078] Furthermore, such as Figure 7 , Figure 8 As shown, one end of the first rotating shaft 253 is fixedly connected to the first boss 251, and the other end is fixedly connected to the first gear 236; and the first gear 236, the first rotating shaft 253 and the output shaft of the expansion motor 235 are coaxially arranged and fixedly connected; when the expansion motor 235 drives the first gear 236 to rotate, it can drive the first boss 251 to rotate.

[0079] Furthermore, such as Figure 7 , Figure 8 As shown, one end of the second rotating shaft 254 is fixedly connected to the second boss 252, and the other end is fixedly connected to the second gear 237; when the first gear 236 rotates under the drive of the expansion motor 235, the second gear 237 can drive the second rotating shaft 254 and the second boss 252 to rotate synchronously and in the opposite direction to the first boss 251.

[0080] In other words, the expansion motor 235 outputs rotational motion to the first gear 236, and the first gear 236 meshes with the second gear 237 to drive the second gear 237 to rotate in the opposite direction. Thus, the first gear 236 and the second gear 237 can drive the first boss 251 and the second boss 252 to deflect synchronously in opposite directions.

[0081] like Figure 8 , Figure 9 As shown, both the first boss 251 and the second boss 252 are columnar structures with a fan-shaped cross-section.

[0082] Specifically, the first rotating shaft 253 and the second rotating shaft 254 are respectively fixedly installed at one end of the first boss 251 and the second boss 252. When the expansion motor 235 drives the first boss 251 and the second boss 252 to rotate, their outer arc surfaces move outward synchronously.

[0083] Specifically, the sector-shaped pillars of the first boss 251 and the second boss 252 each have two radial side planes; and the radial side planes of the first boss 251 and the second boss 252 are in contact with each other.

[0084] Specifically, the end of the first boss 251 connected to the first rotating shaft 253 is provided with a first fillet, and the end of the second boss 252 connected to the second rotating shaft 254 is provided with a second fillet; the arc surface of the first fillet is coaxial with the first rotating shaft 253, and the arc surface of the second fillet is coaxial with the second rotating shaft 254, and the first fillet and the second fillet are tangent. That is to say, the sum of the radius R1 of the first fillet and the radius R2 of the second fillet is equal to the distance L between the axis of the first rotating shaft 253 and the axis of the second rotating shaft 254. Figure 8 As shown, when the first boss 251 and the second boss 252 rotate in opposite directions under the drive of the expansion motor 235, the arc surfaces of the first fillet and the second fillet are tangent and roll relative to each other.

[0085] Furthermore, both the first and second fillets are 90° fillets.

[0086] It is worth noting that in this embodiment, the deflection angles of the first boss 251 and the second boss 252 are set according to the actual needs of the formed product, and 90° is the maximum deflection angle of the first boss 251 and the second boss 252.

[0087] In this embodiment, the outer arc surfaces of the first boss 251 and the second boss 252 are circular arc surfaces or involute arc surfaces; or, they may be other types of arc surfaces. The type, curvature, and curvature variation law of the outer arc surfaces of the first boss 251 and the second boss 252 are not considered as limitations on the shape and structure of the first boss 251 and the second boss 252 in this embodiment.

[0088] In this embodiment, the process of the adjusting roller assembly expanding the metal workpiece 5 is as follows: the adjusting motor 25 drives the adjusting platform 231 to move, and then the first boss 251 and the second boss 252 come into contact with the metal workpiece 5, which can stretch the metal workpiece 5, thereby causing the metal workpiece 5 to expand and deform.

[0089] In this embodiment, the process of adjusting the shape of the metal workpiece 5 by the adjusting roller assembly is as follows: the expanding motor 235 drives the first gear 236 to rotate, the first gear 236 and the second gear 237 mesh and drive each other, and then the first boss 251 and the second boss 252 are driven to rotate in opposite directions through the first rotating shaft 253 and the second rotating shaft 254. The first boss 251 and the second boss 252 press the metal workpiece 5 outward on the arc surface, expanding and correcting the local position of the metal workpiece 5.

[0090] In this embodiment, the first boss 251 and the second boss 252 expand and deflect outward simultaneously, which can expand or correct the local bends, angles, or abnormal protrusions of the metal workpiece 5, thereby improving the forming efficiency and forming quality of the expanded forming of the metal workpiece 5.

[0091] Example 4

[0092] A specific embodiment of the present invention provides a method for forming metal parts, employing the deconstruction and expansion thermoforming equipment of Embodiments 1, 2, or 3. First, the first roller 21 and the second roller 22 are mounted on the side of the worktable 1 via a fixing base 244. A heating device 4 is disposed on the worktable 1, and when the metal workpiece 5 is placed on the upper surface of the worktable 1, the heating device 4 can heat the metal workpiece 5. Second, when the metal workpiece 5 is heated to a certain temperature, its shape is adjusted and expanded by adjusting the roller 23. Specifically, the displacement of the drive bushing 243 of the motor 25 is adjusted, thereby causing the adjusting roller 23 to move forward or backward by different dimensions. When the adjusting roller 23 moves forward, a tensile force can be applied inside the pre-formed metal part 5, thereby pushing the pre-formed metal part 5 to deform. Third, the adjusting roller 23 moves backward to release the metal workpiece 5, and then the position of the metal workpiece is adjusted by the robotic arm 3, and it is stretched and expanded again by adjusting the roller 23. Fourth, the second and third steps are repeated until the part reaches the desired shape. In this invention, when the metal workpiece 5 is stretched by adjusting the roller 23, the robotic arm 3 holds the metal workpiece 5 with the mechanical gripper at its end to provide the tensile force that stretches and deforms the metal workpiece 5.

[0093] Furthermore, for workpieces without features on the inner and outer sides, the drive motor 27 is connected to the first roll 21, driving the first roll 21 to rotate, and the first roll 21 and the second roll 22 rotate together through the transmission mechanism, cooperating with the adjustment roll 23 to stretch the workpiece, and jointly completing the inching forming or rolling forming feature of the metal workpiece 5.

[0094] like Figure 3 As shown, the pre-formed metal blank part is placed flat on the worktable 1 by the robotic arm 3, positioned between the adjusting roller 23 and the first roller 21 and the second roller 22. The heating device 4 is controlled by an automatic control program to rapidly heat the part locally, and the adjusting motor 25 is controlled to drive the adjusting roller 23 to repeatedly press down to a designated position for point-controlled forming (for parts with large bends). During the process, the robotic arm 3 assists in adjusting the forming position of the part. The drive motor 27 is energized to drive the first roller 21 and the second roller 22 to rotate. At this time, the adjusting motor 25 is controlled to drive the screw to rotate and repeatedly press down or move up to the position set by the automatic control program, performing rotary rolling to form an arc. The part blank is as follows... Figure 9 As shown, the formed ring-shaped workpiece is as follows Figure 10 As shown.

[0095] For workpieces with features on the inside or outside, rolling forming can easily damage their surface features. Therefore, the adjusting roller assembly of Embodiment 2 or Embodiment 3 is used in conjunction with the robotic arm 3 to stretch and expand the preform. By applying a stretching tension or thrust to the inside of the preform, the metal workpiece 5 is deformed until its shape reaches the expected value.

[0096] like Figure 4 , Figure 11 , Figure 12 , Figure 13 , Figure 14 As shown, a ring-shaped part with inner or outer wall features is formed by placing a pre-formed metal blank part flat on the worktable 1 by a robotic arm 3, and placing it on the outside of the expanding cam 233 or the adjusting cam assembly. The heating device 4 is controlled by an automatic control program to rapidly heat the part locally. The position of the part is adjusted by the robotic arm 3. After the robotic arm 3 adjusts the metal workpiece 5 to the appropriate position, it is pressed, stretched, and expanded by the adjusting roller assembly.

[0097] Compared with the prior art, the technical solution provided by the present invention has one of the following beneficial effects:

[0098] 1. The deconstruction and expansion progressive forming equipment based on local heating of the present invention expands the workpiece blank by adjusting the roller 23 and adjusts the position of the part by the robotic arm 3, which solves the problems of low material utilization, long manufacturing cycle and cumbersome manual operation in the thermoforming process of frame-type parts.

[0099] 2. The deconstruction and expansion progressive forming equipment based on local heating of the present invention expands and forms parts by adjusting the rollers, resulting in high forming efficiency, minimal impact on the uniformity of microstructure and properties during the forming process, and improved utilization of part materials.

[0100] 3. The deconstruction and expansion progressive forming equipment based on local heating of the present invention can realize the expansion forming of frame-shaped parts. It can not only realize the expansion forming of circular metal workpieces, but also is suitable for the forming of rectangular, prismatic and other frame-shaped parts; it has high forming efficiency, shortens the manufacturing cycle, and improves product qualification rate and stability.

[0101] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A deconstruction and expansion progressive forming device based on local heating, characterized in that, include: A workbench (1) and a thermoforming device (2); the workbench (1) is used to support the metal workpiece (5) to be processed; the thermoforming device (2) is mounted on the workbench (1); The thermoforming device (2) is provided with one or more; the thermoforming device (2) includes: an adjusting roller assembly and an adjusting motor (25); The adjusting roller assembly includes: an adjusting platform (231), a rotating shaft (232), an expanding cam (233), and an expanding motor (235); the adjusting platform (231) is connected to the adjusting motor (25), the expanding motor (235) is fixedly mounted on the adjusting platform (231), one end of the rotating shaft (232) is fixedly connected to the output shaft of the adjusting motor (25), and the other end passes through the adjusting platform (231) and is fixedly connected to the expanding cam (233). The expanding cam (233) is crescent-shaped and fixedly connected to the rotating shaft (232) in the middle. The outer surface of the expanding cam (233) is arc-shaped, and the distance between the outer surface of the expanding cam (233) and the axis of the rotating shaft (232) gradually increases from the center to both sides. The adjusting motor (25) drives the adjusting platform (231) to move, and the expanding motor (235) drives the expanding cam (233) to deflect back and forth. The outer arc surface of the expanding cam (233) gradually squeezes the metal workpiece (5). The deconstruction and expansion progressive forming equipment also includes: a robotic arm (3); the end effector of the robotic arm (3) is a mechanical gripper; the mechanical gripper is used to hold the metal workpiece (5). The adjustment motor (25) drives the adjustment roller assembly to move, and at the same time assists the mechanical arm (3) in clamping, which can stretch the metal workpiece (5); when the expansion cam (233) stretches the metal workpiece (5), the middle part of the expansion cam (233) contacts the inner wall surface of the metal workpiece (5), and then the adjustment motor (25) drives the adjustment platform (231) to move, and the expansion cam (233) moves synchronously to stretch the metal workpiece (5); When the expansion motor (235) drives the expansion cam (233) to deflect to the left, it can expand the left side of the metal workpiece (5). When the expansion motor (235) drives the expansion cam (233) to deflect to the right, it can expand the right side of the metal workpiece (5).

2. The deconstruction and expansion progressive forming device based on local heating according to claim 1, characterized in that, The workbench (1) is also equipped with a heating device (4); the heating device (4) is used to heat the metal workpiece (5).

3. The deconstruction and expansion progressive forming device based on local heating according to claim 2, characterized in that, The thermoforming apparatus (2) further includes: a first roll (21) and a second roll (22); the first roll (21) and the second roll (22) are parallel to each other and perpendicular to the upper surface of the worktable (1); a positioning table (24) is provided below the worktable (1), and a fixed seat (244) parallel to the positioning table (24) is provided above the worktable (1); the first roll (21) and the second roll (22) are rotatably mounted between the positioning table (24) and the fixed seat (244); when the adjusting motor (25) drives the adjusting roll assembly to move, the adjusting roll assembly moves closer to or further away from the first roll (21) and the second roll (22).

4. The deconstruction and expansion progressive forming device based on local heating according to claim 3, characterized in that, The first roll (21) and the second roll (22) are connected to the drive motor (27) through a speed reducer (26); the first roll (21) and the second roll (22) can rotate synchronously under the drive of the drive motor (27).

5. A method for forming a metal part, characterized in that, The deconstruction spreading progressive forming apparatus based on local heating as described in any one of claims 1-4 is used.

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