A rotary radial forging and shaping device for steel pipe blanks

Abstract

This invention provides a rotary radial forging and shaping device for steel pipe blanks, relating to the technical field of steel pipe forging equipment. It includes a traveling platform; a floating center clamping mechanism, comprising two sets of symmetrically distributed forging blanks with near-circular cross-sections mounted on the traveling platform; each set of the floating center clamping mechanism has a drive shaft and a floating chuck, the floating chuck having a floating disc sleeved on the drive shaft and rotating with it, a chuck sleeved on the drive shaft at the front of the floating disc, and three radially sliding clamping blocks on the chuck clamping the forging blank with a near-circular end face; a floating connecting rod with spherical hinges at both ends connecting any clamping block to the floating chuck; and a radial forging mechanism, coaxially mounted on the traveling platform with the drive shaft, forging any segment of the near-circular cross-section forging blank. This invention has advantages such as stable clamping, uniform shaping, high automation, and convenient maintenance, and is suitable for efficient and high-quality shaping of steel pipe blanks with near-circular cross-sections.

Description

Technical Field

[0001] This invention relates to the field of steel pipe forging equipment technology, specifically a rotary steel pipe blank radial forging and shaping device. Background Technology

[0002] In the manufacturing of thin-walled seamless steel pipes, the steel pipe blank is pre-sized by forging, but the forging effect is relatively rough. The hole is enlarged to close to the preset diameter by using a lever and a one-way hydraulic cylinder in conjunction with a flat forging head. Therefore, the overall axis is in a nearly straight state, and the pipe blank is in a rough near-circular state, requiring subsequent overall shaping steps. When performing radial forging shaping, existing equipment generally has significant technical defects.

[0003] Traditional clamping devices often employ rigid three-jaw chucks or fixed mandrel structures, with their clamping centers strictly concentric with the spindle. This makes them unsuitable for adapting to dynamic axial displacement caused by uneven stress during rotary forging of non-linear billets. When the billet ends have geometric deviations or bends, rigid clamping easily leads to localized stress concentration, slippage, and even billet deformation or equipment damage. Furthermore, existing radial forging mechanisms typically use symmetrical hydraulic cylinders to directly drive fixed forging heads, lacking a coordinated mechanism among the forging blocks. During billet forging, the first contacting forging block only forges the contact area, resulting in localized over-forging and under-forging in other areas, making it difficult to achieve the desired uniform forging shape and consistent outer diameter.

[0004] Therefore, there is an urgent need for a technology that can achieve adaptive clamping, dynamic centering, and multi-point coordinated radial forging to effectively solve the key technical bottlenecks of clamping instability and uneven forming of steel pipe blanks during forging, and improve product quality.

[0005] To address this, we provide a rotary radial forging and shaping device for steel tube blanks. Summary of the Invention

[0006] The main objective of this invention is to provide a rotary radial forging and shaping device for steel pipe blanks, which can effectively solve the problems of clamping instability and uneven shaping mentioned in the background art.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A rotary radial forging and shaping device for steel pipe blanks includes a traveling platform;

[0009] The floating center clamping mechanism consists of two sets of symmetrically distributed forging blanks with near-circular cross-sections mounted on the traveling platform.

[0010] The radial forging mechanism is coaxially mounted on the traveling platform with the transmission main shaft to forge forging blanks of any near-circular cross-section;

[0011] Each of the aforementioned floating center clamping mechanisms has a transmission main shaft and a floating chuck. The floating chuck has a floating disc sleeved on the transmission main shaft and rotating with it. A chuck sleeved on the transmission main shaft is provided on the front side of the floating disc. The chuck has three radially sliding clamping blocks that clamp the forging blank with a near-circular end face. A floating connecting rod is provided between any of the clamping blocks and the floating chuck, with both ends respectively spherically hinged.

[0012] The radial forging mechanism has an annular frame, a slide rail assembly, and a push assembly. An arc-shaped forging block is mounted on the slide rail assembly and can slide radially. The push assembly is mounted on the annular frame and acts axially on the slide rail assembly, causing the arc-shaped forging block to slide radially to form radial forging. After any of the arc-shaped forging blocks approaches the forging blank with a near-circular cross-section and forms contact, it causes it to shift towards the other arc-shaped forging blocks, forming multi-point forging force automatic compensation. The end of the forging blank with a near-circular cross-section adapts to the shift, causing the chuck and the transmission main shaft to form an eccentric floating.

[0013] Preferably, the slide rail assembly has a radial guide rail pair, a forging head slider and a reset component. Multiple radial guide rail pairs are provided and evenly distributed around the circumference, installed on the annular frame and connected to the forging head slider for radial sliding. An arc-shaped forging block is installed on the forging head slider. The reset component is fixed between the forging head slider and the annular frame so that the arc-shaped forging block resets after radial sliding.

[0014] The pushing assembly includes a floating annular pressure plate, a shaft thrust assembly, and a thrust ball bearing. The shaft thrust assembly, mounted on the annular frame, pushes the thrust ball bearing connected to its output end to push the floating annular pressure plate to slide within the annular frame. The floating annular pressure plate has a slope on the side that contacts the forging head slider. The forging head slider has a radial sliding tendency under the axial movement of the floating annular pressure plate.

[0015] Preferably, the traveling platform includes a traveling frame, a lifting vehicle, and a track assembly;

[0016] The traveling frame has a bearing seat and a frame, and the bearing seat is fixedly sleeved on the transmission main shaft and fixed to the top of the frame;

[0017] The lifting vehicle is installed at the bottom of the ring-shaped frame;

[0018] The track assembly has a traveling track and a locking track, the traveling track and the locking track are located on the same plane, and the frame and the lifting vehicle move along the length direction on the traveling track;

[0019] Both the frame and the lifting vehicle are driven by a drive housing along the length of the locking track, thereby achieving segmented continuous shaping of the forging blank.

[0020] Preferably, the transmission spindle has a shaft mounted on a traveling platform, the shaft is provided with a spline portion and a blocking ring, and the floating disk is adapted to be fitted with the spline portion and the blocking ring restricts its axial movement.

[0021] Preferably, the floating chuck also has a straightening member fixed to the end of the transmission spindle;

[0022] The straightening component has a connecting plate, a spring, and a fitting ring. The connecting plate is installed at the end of the transmission main shaft and the spring and the fitting ring are fixed in sequence along the axial direction. The fitting ring is close to the clamping plate through the spring.

[0023] Preferably, the floating disk has a disc, and an adaptation hole adapted to the spline portion is provided at the center of the disc, and three ball sockets are evenly distributed on the outer circumference of the disc;

[0024] The floating link has a rod body, a ball head, and a spherical recess. The two ends of the rod body are fixed to the ball head and the spherical recess, respectively, and the ball head and the recess are connected in a one-to-one correspondence.

[0025] The clamp has an annular disk, which is disc-shaped and has a movable circular opening at the center with a diameter larger than that of the transmission main shaft. The annular disk has three T-grooves in the radial direction.

[0026] The clamping block has a T-shaped block, a chuck, and a convex ball platform. The T-shaped block slides in the T-groove and is connected to the chuck on one side. The convex ball platform is located on the other side and is connected to the spherical concave head.

[0027] Preferably, the annular frame has an annular frame with three mounting windows distributed circumferentially on the annular frame;

[0028] The radial guide rail pair has a guide rail and a slide table, the guide rail is fixed inside the mounting window and the slide table slides on it;

[0029] The forging head slider is fixed on the slide table in a T-shape, and the angle of the machined slope at its transverse end is α, 10°≤α≤25°;

[0030] The arc-shaped forging block is mounted on the forging head slider in an arc shape;

[0031] The reset component has a long plate, a reset spring, and a fixed plate. The fixed plate is fixed inside the mounting window, the long plate is fixed to the top of the forging head slider, and the reset spring is fixed between the long plate and the fixed plate.

[0032] Preferably, the floating annular pressure plate has a pressure ring and a pressure head. The pressure ring is annular and its outer diameter is adapted to the inner diameter of the annular frame and connected to the pressure head. Three pressure heads are provided, corresponding to the forging head slider.

[0033] The shaft push assembly has a mounting frame, a forging cylinder and a connecting piece. The forging cylinder is fixed on the ring frame by the mounting frame and the connecting piece is installed at the output end of the forging cylinder.

[0034] The thrust ball bearing is fixed to the end of the connecting piece and the pressure ring on both sides.

[0035] Preferably, a T-shaped groove is provided on the lower side of the forging head slider, and a T-shaped slider is provided on the arc-shaped forging block. The T-shaped slider and the T-shaped groove are adapted to slide and connect. A hand-tightening bolt is provided on the top of the forging head slider to lock the arc-shaped forging block in position.

[0036] Preferably, any of the frames is equipped with a geared motor, which is connected to the end of the transmission main shaft via a coupling at its output end, for driving the forging blank to rotate intermittently.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. Achieve adaptive clamping and dynamic centering of non-circular cross-section billets; through the spherical hinge linkage structure composed of a floating disc, floating connecting rod, and clamping block in the floating center clamping mechanism, the clamping disc can freely float eccentrically in the radial and angular directions. When the end of the non-circular cross-section forging billet contacts the clamping disc, the clamping block automatically slides and conforms to the inner wall of the billet, and the entire clamping disc dynamically shifts with the axis of the billet end, realizing "floating center" clamping, effectively adapting to the forging requirements of billets with non-linear axes.

[0039] 2. Multi-point coordinated forging improves the uniformity of shaping; in the radial forging mechanism, the floating annular pressure plate pushes multiple forging head sliders through the slope, so that the arc-shaped forging blocks are fed radially synchronously. After any arc-shaped forging block contacts the non-circular billet, it will push the billet to shift towards the other forging blocks, which will cause the multi-point forging force to be automatically and evenly distributed, forming a positive coordinated feedback, which is conducive to the billet approaching the ideal round state.

[0040] 3. The traveling platform supports segmented continuous forging; the traveling platform includes a traveling frame and a lifting carriage, which are equipped with a floating center clamping mechanism and a radial forging mechanism, respectively, and can move along the length direction on the track assembly. Combined with the intermittent deflection controlled by the geared motor, one forging action can be completed in the drive interval, and continuous shaping from one end of the billet to the other can be achieved by moving the lifting carriage.

[0041] 4. Modular forging head design facilitates replacement and maintenance; the arc-shaped forging block is slidably connected to the T-shaped slide groove on the lower side of the forging head slide block via a T-shaped slider and locked in position by hand-tightening bolts, allowing for quick replacement of forging blocks of different specifications without special tools, thus improving equipment adaptability. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0044] Figure 2 This is a schematic diagram of the working state of the present invention.

[0045] Figure 3 This is a schematic diagram showing the distribution of some structures in this invention.

[0046] Figure 4 This is an exploded view of the structure of the buoyancy clamping mechanism in this invention.

[0047] Figure 5 This is a half-sectional view of the floating center clamping mechanism in this invention.

[0048] Figure 6 This is an exploded view of the radial forging mechanism in this invention.

[0049] Figure 7 This is a schematic diagram of the slide rail assembly in this invention.

[0050] Figure 8 This is a half-sectional view of the radial forging mechanism in this invention.

[0051] Figures 1-8 middle:

[0052] 1. Drive shaft; 11. Shaft; 12. Splined section; 13. Barrier ring;

[0053] 2. Floating clamp; 21. Floating disc; 211. Disc; 212. Adaptation hole; 213. Ball socket one; 22. Floating connecting rod; 221. Rod body; 222. Ball head; 223. Spherical concave head; 23. Clamp; 231. Ring disc; 232. Movable round opening; 233. T-slot; 24. Clamping block; 241. T-block; 242. Clamp head; 243. Convex ball table; 25. Straightening component; 251. Connecting disc; 252. Spring; 253. Fitting ring;

[0054] 3. Disc spring assembly;

[0055] 4. Radial forging mechanism; 41. Annular frame; 411. Ring frame; 412. Mounting window; 42. Radial guide rail pair; 421. Guide rail; 422. Slide table; 43. Forging head slider; 44. Arc-shaped forging block; 45. Reset component; 451. Long plate; 452. Reset spring; 453. Fixing plate; 46. Floating annular pressure plate; 461. Pressure ring; 462. Pressure head; 47. Shaft thrust assembly; 471. Mounting bracket; 472. Forging cylinder; 473. Connecting component; 48. Thrust ball bearing;

[0056] 5. Walking frame; 51. Bearing housing; 52. Chassis; 6. Gear motor; 7. Lifting vehicle; 8. Track assembly; 81. Walking track; 82. Locking track; 9. Drive housing;

[0057] 100. Forging blank. Detailed Implementation

[0058] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0059] like Figures 1-8 As shown, a rotary steel pipe blank radial forging and shaping device includes a traveling platform, a floating center clamping mechanism and a radial forging mechanism 4. The floating center clamping mechanism is provided with two sets of forging blanks 100 with near-circular cross sections installed on the traveling platform in a symmetrical manner.

[0060] Each set of floating center clamping mechanisms has a transmission main shaft 1, and the transmission main shaft 1 has a shaft 11 mounted on the traveling platform.

[0061] refer to Figures 1-2 To facilitate the placement of the near-circular cross-section forging blank 100 between two floating center clamping mechanisms, a traveling platform is provided. The traveling platform has a traveling frame 5, which has a bearing seat 51 and a frame 52. The bearing seat 51 is fixedly sleeved on the shaft 11 and fixed to the top of the frame 52. To facilitate the driving of the shaft 11, a geared motor 6 is installed on either frame 52. The output end of the geared motor is connected to the end of the transmission shaft 1 through a coupling, driving the transmission shaft 1 to rotate. For more uniform forging, the geared motor 6 is controlled by an external PLC to achieve intermittent deflection at a fixed angle. In this embodiment, the deflection angle is set to 5° each time. To move the two frames 52 closer or further apart, the traveling platform also has a track group 8, which has a traveling track 81 and a locking track 82. The traveling track 81 and the locking track 82 are located on the same plane. A drive housing 9 is provided on the frame 52 to drive the frame 52 to move along the length direction on the traveling track 81 to dock with the forging blank 100.

[0062] It should be noted that the cooperation between the drive housing 9 and the locking rail 82 is a prior art technique. The drive housing 9 is equipped with a geared drive motor, drive wheel set, and control housing to realize the relative movement between the drive housing 9 and the locking rail 82 and provide locking capability. The specific structure of this prior art that provides locking capability will not be described in detail here.

[0063] Based on this, when the forging blank 100 to be forged is clamped by the traveling platform, the traveling frame 5 is controlled by the drive housing 9 to approach and push the floating center clamping mechanism to contact both ends of the forging blank 100, thus completing the movement. Furthermore, the forging blank 100 clamped by the floating chuck 2 can be intermittently deflected by 5° via the reduction motor 6 and external PLC control. This is existing technology and will not be described in detail further.

[0064] refer to Figures 3-5 Each set of floating center clamping mechanisms also has a floating chuck 2; the floating chuck 2 has a floating disk 21 sleeved on the spline part 12 and rotating therewith, and a chuck 23 sleeved on the front side of the floating disk 21 is provided on the transmission main shaft 1. The chuck 23 has three radially sliding clamping blocks 24 clamping the forging blank 100 near the round end face. A floating connecting rod 22 with spherical hinges at both ends is provided between any clamping block 24 and the floating chuck 2.

[0065] In order for the floating disk 21 to rotate with the shaft 11, a splined part 12 is provided on the shaft 11 to achieve the same rotation. At the same time, a blocking protrusion ring 13 is provided on the shaft 11 to block and limit the insertion position of the floating disk 21. In order for the clamping plate 23 to make contact buffer with the forging blank 100 with a near circular cross section, a set of six disc springs 3 is provided between the blocking protrusion ring 13 and the floating disk 21.

[0066] The floating disk 21 has a disk 211, with an adaptation hole 212 at the center of the disk 211 that fits with the spline part 12. Three ball sockets 213 are evenly distributed on the outer circumference of the disk 211. Three floating connecting rods 22 are connected to the three ball sockets 213. Each floating connecting rod 22 has a rod body 221, with a ball head 222 and a spherical concave head 223 fixed at both ends of the rod body 221. The ball head 222 is connected to the ball socket 213. The clamping disk 23 has an annular disk 231, which is disc-shaped and has a movable circular opening 232 at the center with a diameter larger than that of the transmission main shaft 1. Three T-slots 233 are provided on the annular disk 231 in the radial direction. The clamping block 24 has a T-shaped block 241, which slides in the T-slots 233 and is connected to a chuck 242 on one side. A convex ball platform 243 is fixed on the other side of the T-shaped block 241 and is connected to the spherical concave head 223.

[0067] It should be noted that the cross-section of the spline portion 12 has the same shape and size as the adapting hole 212; the rod body 221 has a conical movable area through the ball head 222 and the ball socket 213, and the spherical concave head 223 is provided with a spherical concave and forms a connection with the convex ball platform 243, having a conical movable area, which can provide the eccentric floating effect of the chuck 23, forming a conical movable range with an axis deviation angle of less than 10° from the transmission spindle 1. At the same time, the diameter of the movable circular opening 232 is larger than the diameter of the spline portion 12. In this embodiment, the diameter difference is set at 5 cm to provide movable deflection of the chuck 23. The chuck 242 is set in an arc shape to fit the forging blank 100 to be forged. Lubrication grooves are provided between the ball head 222 and the ball socket 213, and between the convex ball platform 243 and the spherical concave head 223, and suitable lubricating oil is used for lubrication. The connection method of the convex ball platform 243 and the spherical concave head 223 is referred to Figure 5 .

[0068] To facilitate a small eccentric floating state between the chuck 23 and the transmission spindle 1 when not in operation, a centering component 25 is provided. The centering component 25 includes a connecting plate 251, a spring 252, and a contact ring 253. The connecting plate 251 is installed at the end of the transmission spindle 1, and the spring 252 and the contact ring 253 are sequentially fixed along the axial direction. The contact ring 253 is brought close to the chuck 23 by the spring 252, thus maintaining the contact ring 253 in contact with the ring plate 231 and reducing the eccentric floating angle of the chuck 23 under gravity. A long screw is fixed on the connecting plate 251, and a deep threaded hole is provided at the end of the transmission spindle 1. The position of the connecting plate 251 is changed by adjusting the depth of the long screw. A high-temperature protective sleeve is provided around the outer periphery of the spring 252.

[0069] Based on this, the floating center clamping mechanism approaches the forging blank 100 under the driving action of the traveling frame 5 and the drive housing 9. When clamping the forging blank 100, the floating center clamping mechanism approaches the end of the forging blank 100, and the end of the forging blank 100 abuts against the ring disk 231. After the ring disk 231 contacts the end of the forging blank 100, it squeezes, causing the T-shaped block 241 to slide in the T-groove 233 under the cooperation of the clamping plate 23 and the floating connecting rod 22. The convex ball platform 243 moves relative to the spherical concave head 223, and the ball socket 213 moves relative to the ball head 222, forming the radial sliding of the clamping block 24. The chuck 242 abuts against the inner wall of the forging blank 100, completing the clamping of the forging blank 100; simultaneously, the ring disc 231 also forms an eccentric floating state with the spline portion 12 to adapt to the end of the forging blank 100, that is, it allows the chuck 23 to float eccentrically relative to the transmission spindle 1, reducing the phenomenon of clamping loosening or slippage; it can meet the requirement of adapting to the dynamic axial position of the end of the forging blank 100 with a near-circular cross section during forging, realizing the dynamic axial centering of the forging blank 100; compared with the prior art, it is better adapted to the forging of forging blanks 100 with non-linear axes. And under the low speed of the geared motor 6, it ensures stable clamping of the end.

[0070] refer to Figure 2 , Figure 3 and Figure 6 The radial forging mechanism 4 is coaxial with the transmission spindle 1 and is mounted on the traveling platform to forge a forging blank 100 with an arbitrary near-circular cross section. In order to support the radial forging mechanism 4 and forge the forging blank 100 at various positions, the traveling platform also has a lifting carriage 7. The lifting carriage 7 is set at the bottom of the radial forging mechanism 4 and is equipped with a drive housing 9. The drive housing 9 drives the lifting carriage 7 to move on the track group 8, thereby driving the radial forging mechanism 4 to perform segmented continuous shaping of the forging blank 100.

[0071] The radial forging mechanism 4 has an annular frame 41, a slide rail assembly, and a push assembly. An arc-shaped forging block 44 is mounted on the slide rail assembly and can slide radially. The push assembly is mounted on the annular frame 41 and acts axially on the slide rail assembly, causing the arc-shaped forging block 44 to slide radially to form radial forging. After any arc-shaped forging block 44 approaches the forging blank 100 with a near-circular cross section and forms contact, it causes it to shift to the other arc-shaped forging blocks 44 to form multi-point forging force automatic compensation. The end of the forging blank 100 with a near-circular cross section is adapted to the shift, causing the chuck 23 and the transmission main shaft 1 to form an eccentric floating.

[0072] refer to Figure 7 The slide rail assembly has a radial guide rail pair 42, a forging head slider 43 and a reset member 45. Multiple radial guide rail pairs 42 are evenly distributed around the circumference and installed on the annular frame 41 and connected to the forging head slider 43 for radial sliding. An arc-shaped forging block 44 is installed on the forging head slider 43. The reset member 45 is fixed between the forging head slider 43 and the annular frame 41 so that the arc-shaped forging block 44 is reset after radial sliding.

[0073] The annular frame 41 has an annular frame 411 with three mounting windows 412 distributed circumferentially on the annular frame 411; the radial guide rail pair 42 has a guide rail 421 and a slide table 422, the guide rail 421 is fixed inside the mounting window 412 and the slide table 422 slides on it, and the arc-shaped forging block 44 is mounted in an arc shape on the forging head slider 43; the reset component 45 has a long plate 451, a reset spring 452 and a fixing plate 453, the fixing plate 453 is fixed inside the mounting window 412, the long plate 451 is fixed to the top of the forging head slider 43, and then the reset spring 452 is fixed between the long plate 451 and the fixing plate 453, and the radially sliding forging head slider 43 is reset by the reset spring 452.

[0074] It should be noted that the forging head slider 43 is fixed on the slide table 422 in a T-shape, and the angle of the machined slope at its transverse end is α, 10°≤α≤25°; in this embodiment, it is set to 15°, which is beneficial for providing radial downward pressure. The inner arc surface of the arc-shaped forging block 44 is the same as the outer diameter of the preset forging blank 100, which is beneficial for the forging shape to tend to the preset diameter value. A high-temperature protective sleeve is provided on the outer periphery of the return spring 452.

[0075] To facilitate the replacement of the arc-shaped forging block 44, a T-shaped groove is provided on the lower side of the forging head slider 43, and a T-shaped slider is provided on the arc-shaped forging block 44. The T-shaped slider and the T-shaped groove are adapted to slide and connect. A hand-tightening bolt is provided on the top of the forging head slider 43 to lock the position of the forging head slider 43 and the arc-shaped forging block 44.

[0076] refer to Figure 6 and Figure 8 The pushing component has a floating annular pressure plate 46, a shaft thrust assembly 47, and a thrust ball bearing 48. The shaft thrust assembly 47, which is mounted on the annular frame 41, pushes the thrust ball bearing 48 connected to its output end to push the floating annular pressure plate 46 to slide within the inner circumference of the annular frame 41. The side of the floating annular pressure plate 46 that contacts the forging head slider 43 is provided with a slope. The forging head slider 43 has a radial sliding tendency under the axial movement of the floating annular pressure plate 46.

[0077] The floating annular pressure plate 46 has a pressure ring 461 and a pressure head 462. The pressure ring 461 is annular and its outer diameter is adapted to the inner diameter of the annular frame 41 and connected to the pressure head 462. The pressure head 462 is provided with three corresponding to the forging head slider 43. The shaft push assembly 47 has a mounting frame 471, a forging cylinder 472 and a connecting piece 473. The mounting frame 471 is fixed to the annular frame 41, and the forging cylinder 472 is fixed on the mounting frame 471 and the connecting piece 473 is installed at the output end. A thrust ball bearing 48 is installed between the end of the connecting piece 473 and the pressure ring 461 so that the floating annular pressure plate 46 is radially pushed by the output end of the forging cylinder 472 pushing the thrust ball bearing 48.

[0078] It should be noted that the axial thrust assembly 47 has three components evenly distributed on the annular frame 41 to provide axial thrust. The three forging cylinders 472 are connected to external hydraulic equipment to provide synchronized hydraulic power; this is existing technology and will not be elaborated upon here. The forging cylinders 472 are bidirectional hydraulic cylinders. The thrust ball bearing 48 provides axial thrust while also rotating, facilitating the rotation of the floating annular pressure plate 46, and thus facilitating the maintenance of the pressure head 462.

[0079] Based on this, during radial forging of the near-circular cross-section forging blank 100, an axial pushing force is provided by the forging cylinder 472. This force acts on the thrust ball bearing 48 via the connecting piece 473, causing the floating annular pressure plate 46 to slide axially against the annular frame 41. The pressure head 462 on the floating annular pressure plate 46 radially slides and pushes the forging head slider 43, which is provided with radial sliding capability by the radial guide pair 42. The long plate 451 and the fixed plate 453 in the reset piece 45 approach each other, compressing the reset spring 452. The slope of its pressure head 462 is in contact with the forging... The slope of the forging head slider 43 is engaged to allow the arc-shaped forging block 44 connected to the forging head slider 43 to slide radially into contact with the forging blank 100. Due to the near-circular cross-sectional characteristics of the forging blank 100, under the action of the floating center clamping mechanism, the arc-shaped forging block 44 that first contacts the forging blank 100 pushes the forging blank 100 toward the uncontacted arc-shaped forging block 44, causing the axis of the forging blank 100 at the forging location to float and shift. This results in a more uniform forging force at multiple points during forging, forming a positive synergistic feedback effect, which is beneficial for forging the forging blank 100 to approach the ideal state. After the initial forging is completed, the forging cylinder 472 retracts in the reverse direction, the pressure head 462 disengages from the contact with the forging head slider 43, and under the elastic action of the return spring 452, the forging head slider 43 automatically returns to its position. Combined with the intermittent driving action of the geared motor 6, the shaft push assembly 47 completes the sequential pushing and retracting actions during the driving interval. The drive housing 9 drives the radial forging mechanism 4 on the lifting vehicle 7 to move from one end of the forging blank 100 to the other end, forming the continuous forging work of the next part, realizing the automation of forging and improving forging efficiency.

[0080] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. The present invention is not limited to the above embodiments; the embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the claimed invention. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rotary wall radial forging sizing device for a steel tube blank, characterized by, The application relates to a radial forging device for forging a near-circular-section forging blank (100), which comprises the following components: a walking carrier; a floating center clamping mechanism, which is arranged on the walking carrier in a symmetrical distribution mode to clamp the near-circular-section forging blank (100); a radial forging mechanism (4), which is coaxially arranged on the walking carrier with the transmission main shaft (1) to forge the near-circular-section forging blank (100); any group of the floating center clamping mechanism has the transmission main shaft (1) and a floating chuck (2), the floating chuck (2) has a floating disc (21) sleeved on the transmission main shaft (1) and rotating with the transmission main shaft (1), the front side of the floating disc (21) is provided with a chuck (23) sleeved on the transmission main shaft (1), the chuck (23) is provided with three radially sliding clamping blocks (24) to clamp the near-circular-section forging blank (100), and floating connecting rods (22) with spherical hinge connections at two ends are arranged between any group of the clamping blocks (24) and the floating chuck (2); the radial forging mechanism (4) has a ring-shaped frame (41), a sliding rail assembly and a pushing assembly, the sliding rail assembly is provided with arc-shaped forging blocks (44) which can radially slide, the pushing assembly is arranged on the ring-shaped frame (41) and axially acts on the sliding rail assembly to make the arc-shaped forging blocks (44) radially slide to form radial forging, any group of the arc-shaped forging blocks (44) approaches the near-circular-section forging blank (100) to form contact, and then the near-circular-section forging blank (100) is offset to the remaining arc-shaped forging blocks (44) to form automatic compensation of multi-point forging force, and the end of the near-circular-section forging blank (100) is adapted to the offset to make the chuck (23) and the transmission main shaft (1) form eccentric floating; the sliding rail assembly has a radial guide rail pair (42), a forging head sliding block (43) and a reset member (45), the radial guide rail pair (42) is provided with a plurality of components which are uniformly distributed in a circle and are arranged on the ring-shaped frame (41) and are connected with the forging head sliding block (43) to make the forging head sliding block (43) radially slide, the forging head sliding block (43) is provided with the arc-shaped forging blocks (44), and the reset member (45) is fixed between the forging head sliding block (43) and the ring-shaped frame (41) to make the arc-shaped forging blocks (44) radially slide and then reset; the pushing assembly has a floating ring-shaped compression disc (46), an axial pushing assembly (47) and a thrust ball bearing (48), the axial pushing assembly (47) arranged on the ring-shaped frame (41) pushes the thrust ball bearing (48) connected at the output end of the axial pushing assembly (47) to push the floating ring-shaped compression disc (46) to adaptively slide in the inner circle of the ring-shaped frame (41), one side of the floating ring-shaped compression disc (46) in contact with the forging head sliding block (43) is provided with a slope, and the forging head sliding block (43) has a radial sliding trend under the axial motion of the floating ring-shaped compression disc (46).

2. The rotary steel pipe shell wall radial forging sizing device according to claim 1, characterized by, the walking carrier has a walking frame (5), a lifting vehicle (7) and a track group (8); the walking frame (5) has a bearing seat (51) and a vehicle frame (52), the bearing seat (51) is fixedly sleeved on the transmission main shaft (1) and is fixed on the top of the vehicle frame (52); the lifting vehicle (7) is arranged on the bottom of the ring-shaped frame (41). The track group (8) has a walking track (81) and a locking track (82), the walking track (81) and the locking track (82) are in the same plane, the frame (52) and the lifting vehicle (7) move along the length direction on the walking track (81); The frame (52) and the lifting vehicle (7) are driven in the length direction of the locking track (82) through the driving machine box (9), so that the segmented continuous shaping of the forging blank (100) is realized.

3. The rotary steel pipe shell wall radial forging sizing device according to claim 1, characterized by, The transmission main shaft (1) has a shaft rod (11) installed on a walking carrier, a spline part (12) and a blocking convex ring (13) are arranged on the shaft rod (11), the floating disc (21) is adaptively sleeved with the spline part (12) and is limited in the axial movement through the blocking convex ring (13).

4. The rotary steel pipe shell wall radial forging sizing device according to claim 1, characterized by, The floating chuck (2) further has a righting piece (25) fixed at the end of the transmission main shaft (1); The righting piece (25) has a connecting disc (251), a spring (252) and a close-fitting ring (253), the connecting disc (251) is installed at the end of the transmission main shaft (1) and sequentially fixes the spring (252) and the close-fitting ring (253) in the axial direction, and the close-fitting ring (253) is close-fitted with the chuck (23) through the spring (252).

5. The rotary steel tube blank wall radial forging sizing device according to claim 1, characterized by, The floating disc (21) has a disc (211), an adaptive hole (212) adapted with the spline part (12) is arranged at the center of the disc (211), and three ball sockets (213) are uniformly arranged on the outer circumference of the disc (211); The floating connecting rod (22) has a rod body (221), a ball head (222) and a spherical concave head (223), the two ends of the rod body (221) are respectively fixed with the ball head (222) and the spherical concave head (223), and the ball head (222) is correspondingly connected with the ball socket (213); The chuck (23) has a ring disc (231), the ring disc (231) is disc-shaped and is provided with a movable circular opening (232) with a diameter larger than the transmission main shaft (1) at the center, and three T grooves (233) in the radial direction are arranged on the ring disc (231); The clamping block (24) has a T-shaped block (241), a clamp head (242) and a convex spherical platform (243), the T-shaped block (241) slides in the T groove (233) and is connected with the clamp head (242) on one side, and the convex spherical platform (243) is arranged on the other side and connected with the spherical concave head (223).

6. The rotary steel tube blank wall radial forging sizing device of claim 1 wherein, The annular rack (41) has a ring rack (411), three mounting windows (412) are circumferentially distributed on the ring rack (411); The radial guide rail pair (42) has a guide rail (421) and a sliding table (422), the guide rail (421) is fixed in the mounting window (412) and the sliding table (422) slides thereon; The forging head sliding block (43) is T-shaped and fixed on the sliding table (422), and the slope angle of the transverse end is α, 10°≤α≤25°; The arc-shaped forging block (44) is arc-shaped and mounted on the forging head sliding block (43). The reset member (45) has a long plate (451), a reset spring (452) and a fixed plate (453), the fixed plate (453) is fixed in the installation window (412), the long plate (451) is fixed on the top of the forging head slider (43), and the reset spring (452) is fixed between the long plate (451) and the fixed plate (453).

7. The rotary steel tube blank wall radial forging sizing device of claim 1 wherein, The floating ring-shaped pressure disc (46) has a pressure ring (461) and a pressure head (462), the pressure ring (461) is annular and the outer diameter is matched with the inner diameter of the annular frame (41) and connected with the pressure head (462), the pressure head (462) is provided with three corresponding with the forging head slider (43); The shaft pushing assembly (47) has a mounting frame (471), a forging pressing cylinder (472) and a connecting piece (473), the forging pressing cylinder (472) is fixed on the annular frame (41) through the mounting frame (471), and the connecting piece (473) is installed at the output end of the forging pressing cylinder (472); The both sides of the thrust ball bearing (48) are fixed with the end of the connecting piece (473) and the pressure ring (461) respectively.

8. The rotary tube stock wall radial forging sizing device of claim 1 wherein, The lower side of the forging head slider (43) is provided with a T-shaped sliding groove, the arc-shaped forging block (44) is provided with a T-shaped sliding block, the T-shaped sliding block and the T-shaped sliding groove are connected through the T-shaped sliding block and the T-shaped sliding groove, and the top of the forging head slider (43) is provided with a hand screw bolt for locking the position of the arc-shaped forging block (44).

9. The rotary steel tube blank wall radial forging sizing device of claim 2 wherein, Any one of the frame (52) is provided with a speed reduction motor (6), the output end of the speed reduction motor (6) is provided with a shaft coupling, and the end of the transmission main shaft (1) is connected with the shaft coupling, so as to drive the intermittent rotation of the forging blank (100).

Images