A seamless pipe rotary roll forming complete equipment and its working process

Abstract

The application discloses a seamless pipe rotary rolling forming complete equipment and a working process thereof, which comprises sequentially arranged driving assemblies for driving the movement of a pipe drawing assembly, the pipe drawing assembly for fixing and drawing a seamless pipe blank, a front platform for mounting the pipe drawing assembly and the driving assembly, a rotary rolling mechanism for seamless pipe processing, a roller assembly for center positioning and supporting the seamless pipe blank, a mandrel feeding assembly for positioning the mandrel and the seamless pipe blank, a rear platform for mounting the roller assembly, and a cooling system for the rotary rolling mechanism and local cooling of the seamless pipe. When the pipe drawing mechanism and the rotary rolling mechanism work, the pressing cylinder and the pushing cylinder in the mandrel conveying mechanism maintain pressure, so that the rotary rolling section of the mandrel stably stays in the deformation area of the die of the rotary rolling mechanism, and the rotary rolling section is always in a tensioned state, which is beneficial to improving the rolling precision of the pipe blank.

Description

Technical Field

[0001] This invention belongs to the field of spinning and rolling forming technology, specifically relating to a complete set of equipment for seamless tube spinning and rolling forming and its working process. Background Technology

[0002] Seamless tubes are commonly used in fluid transportation, boiler plants, fluid transport components in engineering projects, and machining plants. Common seamless tube forming techniques involve skew rolling followed by skew continuous rolling, longitudinal rolling, or extrusion forming. This process results in products with characteristics such as large wall thickness, low precision, uneven wall thickness, low surface finish, and high cost per length, leading to low material utilization and difficulty in processing extremely thin-walled tubes or tubes with large diameter-to-thickness ratios.

[0003] In addition, in the production of seamless tubes, floating mandrels or limiting mandrels are usually used as inner wall supports to complete the wall reduction process of the rough tube. However, the mandrels used for processing are relatively short, the processing capacity is limited, and the rolling pressure in the deformation zone is high, which easily leads to plastic instability, making it difficult to process seamless steel tubes with large length-to-diameter ratios. Summary of the Invention

[0004] The purpose of this invention is to provide a complete set of equipment for seamless tube spinning and forming and its working process, so as to solve the problems existing in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a complete set of equipment for seamless tube spinning and forming, including a drive assembly for driving the tube drawing assembly, a tube drawing assembly for fixing and pulling the seamless tube blank, a front stage for installing the tube drawing assembly and the drive assembly, a spinning and rolling mechanism for seamless tube processing, a roller assembly for center positioning and support of the seamless tube blank, a mandrel feeding assembly for positioning the mandrel and the seamless tube blank, a back stage for installing the roller assembly, and a cooling system for local cooling of the spinning and rolling mechanism and the seamless tube;

[0007] The drive assembly includes a sprocket motor, a sprocket coupling, a sprocket reducer, a sprocket shaft, a sprocket, and a plate chain; the output shaft of the sprocket motor is connected to the input shaft of the sprocket reducer via the sprocket coupling, and a keyway is provided at the end of the sprocket shaft (reducer output shaft) to connect to the sprocket, and the sprocket meshes with the plate chain;

[0008] The sprocket shaft outputs from both ends, each connected to a sprocket. The two sprockets respectively mesh with and connect to two rows of parallel plate chains. The two rows of parallel plate chains are arranged symmetrically about the machining center line of the spinning mechanism (hereinafter referred to as the machining center line).

[0009] The tube drawing assembly includes a torsion motor, a torsion reducer, a torsion coupling, an intermediate shaft, a hollow torsion shaft, a base mounting trolley, a concave box beam, a gear shaping mechanism, and a hydraulic cylinder. The output end of the torsion motor is connected to the input end of the torsion reducer. The torsion reducer is fixed on the base mounting trolley, and its output end is connected to the intermediate shaft via the torsion coupling. The intermediate shaft is mounted in an intermediate shaft bearing seat on the base mounting trolley via bearings to reduce bending and torsion of the reducer shaft. The output end of the intermediate shaft is connected to the hollow torsion shaft. The other end of the hollow torsion shaft has a cylindrical pin hole that is symmetrical about the center and extends through it. The cylindrical pin hole is pre-machined with respect to one end of the seamless tube blank. The pin holes are the same size. The outer diameter of one end of the seamless tube blank is smaller than the inner diameter of the hollow torsion shaft and there is a certain gap. Four sets of wheel mechanisms are installed at the bottom of the base mounting trolley. The concave box beams are arranged in pairs and placed on both sides of the base mounting trolley and are symmetrical with respect to the machining center line. The concave box beams extend outward to form a mounting platform. The gear-shaping mechanism is a square structure installed in the corresponding through square groove of the mounting platform. The upper plane is connected to the oil cylinder, and the lower plane is a tooth structure. The tooth structure meshes with the drive component plate chain. The oil cylinder is installed and fixed on the fixed plane above the mounting platform. The direction of movement of the oil cylinder shaft is parallel to the pressing direction of the tooth structure.

[0010] The front end includes two sets of support structures and tracks. The components are arranged in pairs in parallel and symmetrical arrangement, with a certain interval between the two components. The support structure includes an upper longitudinal beam, a support beam, and a lower longitudinal beam. The upper longitudinal beam is a channel steel with its opening facing upward. The lower longitudinal beam has the same structure as the upper longitudinal beam and the same opening direction. The support beam is a channel steel with its opening facing outward and is arranged on both sides of the short side of the upper and lower longitudinal beams. The support beam is connected to the upper and lower longitudinal beams by welding. There are two tracks arranged between the two sets of support structures, and the track spacing is the same as the wheel structure spacing.

[0011] Furthermore, the sheet chain is laid flat in the groove of the upper longitudinal beam of the front end, and after looping back to the upper longitudinal beam from one end of the front end to the other end, it is connected to the drive component sprocket through the groove of the lower longitudinal beam to form a closed loop;

[0012] Furthermore, the wheel mechanism is placed symmetrically and parallel to each other at the four corners on the track at the front desk;

[0013] The spinning mechanism includes an annular cylindrical mold, the annular curved surface of which contacts the outer surface of the seamless tube blank and is pressed in radially along the seamless tube blank, the pressing depth forming a thinning amount Δt;

[0014] The idler assembly consists of an idler motor, an idler, and a hydraulic lever;

[0015] The mandrel feeding assembly includes a mandrel for supporting the inner wall during seamless tube deformation, a mandrel tailstock for storing the mandrel, and a mandrel conveying and propulsion mechanism for continuous feeding of the mandrel.

[0016] The mandrel conveying mechanism includes a conveying motor, a conveying reducer, a gear shaft, a universal coupling, a driving gear, a driven gear, a driving conveying roller, a driven conveying roller, a clamping cylinder, a pressing frame, and a fixed frame. The output shaft of the conveying motor is connected to the input shaft of the conveying reducer. The output shaft of the conveying reducer is connected to one end of the gear shaft via a universal coupling. The driving gear is keyed to the other end of the gear shaft. The driving gear meshes with the driven gear for transmission. The driven gear is keyed to the extended shaft of the driving conveying roller. The axle and the active conveyor roller are installed in the pressing frame in order from top to bottom via bearings. A clamping cylinder is provided on the upper surface of the pressing frame and is fixedly installed on the fixed frame. The pressing frame slides in the fixed frame under the drive of the clamping cylinder to realize the active conveyor roller pressing the seamless tube blank. The driven conveyor roller is installed in the fixed frame via bearings. The rotation axis of the driven conveyor roller is lower than the machining center line. The distance from the surface of the driven conveyor roller to the machining center line is the outer radius of the seamless tube blank. The fixed frame is installed on the foundation.

[0017] The mandrel propulsion mechanism includes a lifting cylinder, a propulsion cylinder, and a cylinder support. The lifting cylinder body is installed on the foundation, and the piston rod is connected to the cylinder support. The center line of the piston rod intersects the machining center line, and the piston rod runs perpendicular to the ground and upwards. A slider is installed on one side of the cylinder support and mounted on a fixed frame to ensure that the cylinder support moves perpendicular to the machining center line when the lifting cylinder is running. The propulsion cylinder is installed on the other end of the cylinder support and is mounted on the side of the cylinder support. The center line of the propulsion cylinder is parallel to the machining center line, and the piston rod runs in the direction of mandrel feeding.

[0018] Furthermore, two sets of the aforementioned active conveying rollers are arranged in parallel, with the active gear simultaneously meshing with two driven gears;

[0019] Furthermore, the mandrel is a four-structure slender shaft. The four structures are: a spinning section that supports the plastic deformation of the spinning mechanism, a support section that supports the tail end of the processed tube, a limiting section that limits the extreme position of the spinning section, and a connecting section that connects the sections. The diameter of the spinning section is approximately equal to the inner diameter of the seamless tube blank, with a slight gap between them. The support section is a disc with the same diameter as the spinning section. The limiting section is a frustum structure with an outer diameter larger than the connecting section. The connecting section is a slender shaft with a diameter smaller than the spinning section and the support section, and it does not contact the inner wall of the seamless tube blank during processing.

[0020] Furthermore, the mandrel tailstock is a hollow sleeve, the center line of the sleeve coincides with the machining center line, the inner diameter of the sleeve is larger than the outer diameter of the limiting section, and the length of the sleeve is larger than the length of the seamless tube blank.

[0021] The cooling system includes a hollow annular support, coolant, and a pump. The hollow annular support is arranged outside the through hole of the machining center of the spinning mechanism, coaxial with the machining center line. The diameter of the hollow annular support is larger than the outer diameter of the seamless tube billet. N (n=1,2,3...) circular holes are evenly arranged along the circumference of the hollow annular support, penetrating to the inner wall of the hollow annular support. The opening direction points towards the machining area of ​​the spinning mechanism, serving as a channel for coolant to flow out. The coolant is pumped to the hollow annular support under the drive of the pump and evenly sprayed on the entire circumferential area of ​​the machining area.

[0022] The workflow of a seamless tube spinning and forming complete set of equipment includes the following steps:

[0023] Step 1: First, the mandrel conveying mechanism runs in reverse to retract the mandrel to its limit position. The seamless tube blank is then placed on the roller assembly through the tube transfer mechanism. At this time, the end of the seamless tube blank is located a certain distance outside the end face of the spinning mechanism.

[0024] Step 2: The mandrel conveying mechanism operates, inserting the mandrel through the hole into the seamless tube blank. The mandrel spinning section makes gap contact with the inner surface of the seamless tube blank. Finally, the mandrel spinning section is located at the extreme position of the seamless tube blank near the spinning mechanism. At this time, the lifting cylinder and the connected cylinder support are at the lowest position.

[0025] Step 3: The mandrel pushing mechanism operates, and the lifting cylinder drives the cylinder support to move upward until the center line of the pushing cylinder coincides with the machining center line. The pushing cylinder operates and presses the mandrel limit section to the limit position to contact the fixed frame. At this time, the rough tube and the mandrel move together to the position of the spinning mechanism.

[0026] Step 4: Run the tube drawing assembly to connect the hollow torsion shaft to one end of the seamless tube blank through the pin hole. Then, start the spinning mechanism, cooling system, tube drawing assembly, and drive assembly in sequence. Under the combined action of the tube drawing assembly and drive assembly, the seamless tube blank rotates actively in the circumferential direction and moves axially away from the spinning mechanism to complete the processing.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. When the tube drawing mechanism and the spinning mechanism are working, the clamping cylinder and the pushing cylinder in the mandrel conveying mechanism maintain pressure to ensure that the mandrel spinning section is stably in the deformation zone of the spinning mechanism mold. The spinning section is always under tension, which is beneficial to improving the rolling accuracy of the tube blank.

[0029] 2. By setting up a mandrel conveying and pushing mechanism, the mandrel can be quickly fed in, pushed forward and retracted, which facilitates the rapid loading and unloading of seamless tube blanks, making the rolling rhythm compact, shortening the rolling cycle and improving production efficiency;

[0030] 3. The mandrel adopts a four-structure slender shaft structure, which can solve the problems of short mandrel and limited processing capacity. It can process seamless steel pipes with large length-to-diameter ratio. The connecting section is a slender shaft with a diameter smaller than the spinning section and the support section. It does not contact the inner wall of the seamless pipe blank during processing, which can avoid the mandrel bending and contacting the inner wall of the rough pipe, thus preventing surface peeling and extending the service life of the mandrel. Attached Figure Description

[0031] Figure 1 This is a simplified schematic diagram of the overall structure of a thin-walled seamless tube spinning and rolling equipment according to the present invention;

[0032] Figure 2 This is a schematic diagram of the structural arrangement of the driving components in this invention;

[0033] Figure 3 This is a schematic diagram of the main structural arrangement of the tube drawing assembly in this invention;

[0034] Figure 4 This is a partial top view of the tube-drawing assembly in this invention.

[0035] Figure 5 This is a schematic diagram of the front-end structure layout in this invention;

[0036] Figure 6 This is a schematic diagram of the structural arrangement of the idler roller assembly in this invention;

[0037] Figure 7 This is a top view schematic diagram of the mandrel conveying and propulsion mechanism in this invention.

[0038] Figure 8 This is a front view schematic diagram of the structural arrangement of the mandrel conveying and propulsion mechanism in this invention;

[0039] Figure 9 yes Figure 8 A schematic diagram of the AA transverse cross-sectional structure;

[0040] Figure 10 yes Figure 8 A partial structural schematic diagram of the longitudinal section of BB;

[0041] Figure 11 This is a schematic diagram of the mandrel structure in this invention. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0043] This invention provides a complete set of equipment for seamless tube rotary rolling forming, including a drive assembly 1 for driving the tube drawing assembly, a tube drawing assembly 2 for fixing and pulling the seamless tube blank, a front end 3 for mounting the tube drawing assembly 2 and the drive assembly 1, a rotary rolling mechanism 4 for seamless tube processing, a roller assembly 5 for center positioning and support of the seamless tube blank, a mandrel feeding assembly 6 for positioning the mandrel and the seamless tube blank, a back end 9 for mounting the roller assembly 5, and a cooling system 10 for local cooling of the rotary rolling mechanism 4 and the seamless tube.

[0044] The drive assembly 1 includes a sprocket motor 101, a sprocket coupling 102, a sprocket reducer 103, a sprocket shaft 104, a sprocket 105, and a plate chain; the output shaft of the sprocket motor 101 is connected to the input shaft 103 of the sprocket reducer through the sprocket coupling 102, and a keyway is provided at the end of the sprocket shaft (reducer output shaft) 104, which is connected to the sprocket 105 through the keyway, and the sprocket 105 meshes with the plate chain;

[0045] The sprocket shaft 104 outputs from both ends, each connected to a sprocket 105. The two sprockets 105 respectively mesh with and connect to two rows of parallel plate chains. The two rows of parallel plate chains are arranged symmetrically about the machining center line of the spinning mechanism 4.

[0046] The tube drawing assembly 2 includes a torsion motor 201, a torsion reducer 202, a torsion coupling 203, an intermediate shaft 204, a hollow torsion shaft 205, a base mounting trolley 206, a concave box beam 207, a gear shaping mechanism 208, and a hydraulic cylinder 209. The output end of the torsion motor 201 is connected to the input end of the torsion reducer 202. The torsion reducer 202 is fixed on the base mounting trolley 206, and its output end is connected to the intermediate shaft 204 through the torsion coupling 203. The intermediate shaft 204 is mounted in an intermediate shaft bearing seat on the base mounting trolley 206 through bearings to reduce the bending and torsion of the reducer shaft. The output end of the intermediate shaft 204 is connected to the hollow torsion shaft 205. The other end of the hollow torsion shaft 205 has a cylindrical pin hole that is symmetrical about the center and passes through. The pin hole is the same size as the pin hole pre-machined at one end of the seamless tube blank. The outer diameter of the pin hole end of the seamless tube blank is smaller than the inner diameter of the hollow torsion shaft 205 and there is a certain gap. Four sets of wheel mechanisms 210 are installed at the bottom of the base mounting trolley. Concave box beams 207 are arranged in pairs and placed on both sides of the base mounting trolley 206 and are symmetrical with respect to the machining center line. The concave box beams 207 extend outward to form a mounting platform. The gear-shaping mechanism 208 is a square structure installed in the corresponding through square groove of the mounting platform. The upper plane is connected to the oil cylinder 209, and the lower plane is a tooth structure. The tooth structure meshes with the drive component plate chain. The oil cylinder 209 is fixed to the fixed plane above the mounting platform by bolts. The direction of the movement of the oil cylinder 209 axis is parallel to the pressing direction of the tooth structure.

[0047] In this embodiment, the motor 201 and the reducer output shaft are arranged crosswise;

[0048] In this embodiment, the number of concave box beams 207 is 2, 4, 6, ...;

[0049] In this embodiment, the dimensions of the extended mounting platform of the concave box beam 207 exceed the maximum width of the longitudinal beam on the front end.

[0050] The front panel 3 includes two sets of support structures and tracks. The components are arranged in pairs in parallel and symmetrical arrangement, with a certain interval between the two components. The support structure includes an upper longitudinal beam 301, a support beam 302, and a lower longitudinal beam 303. The upper longitudinal beam 301 is a channel steel with the opening facing upward. The lower longitudinal beam 303 has the same structure as the upper longitudinal beam 301 and the same opening direction. The support beam 302 is a channel steel with the opening facing outward and is arranged on both sides of the short side of the upper longitudinal beam 301 and the lower longitudinal beam 303. The support beam is connected to the upper longitudinal beam 301 and the lower longitudinal beam 303 by welding. There are two tracks 304 arranged between the two sets of support structures. The spacing between the tracks 304 is the same as the spacing between the wheel mechanism 210.

[0051] In this embodiment, the sheet chain is laid flat in the groove of the upper longitudinal beam 301 of the front end 3. After looping back to the upper longitudinal beam 301 from one end of the front end 3 to the other end, the sheet chain is connected to the drive component sprocket through the groove of the lower longitudinal beam 303 to form a closed loop.

[0052] In this embodiment, the wheel mechanism 210 is placed symmetrically and parallelly at the four corners on the track 304 of the front end 3.

[0053] The spinning mechanism 4 includes an annular die, the annular curved surface of which contacts the outer surface of the seamless tube blank and is pressed into the seamless tube blank radially, the pressing depth forming a thinning amount Δt.

[0054] The idler assembly 5 consists of an idler motor 501, an idler 502, and a hydraulic lever 503.

[0055] The mandrel feeding assembly 6 includes a mandrel 7 for supporting the inner wall support during the deformation of the seamless tube, a mandrel tailstock 8 for storing the mandrel, and a mandrel conveying and propulsion mechanism for realizing continuous feeding of the mandrel.

[0056] The mandrel conveying mechanism includes a conveying motor 601, a conveying reducer 602, a gear shaft 603, a universal coupling 604, a driving gear 607, a driven gear 608, a driving conveying roller 614, a driven conveying roller 613, a pressing cylinder 605, a pressing frame 606, and a fixed frame 612. The output shaft of the conveying motor 601 is connected to the input shaft of the conveying reducer 602. The output shaft of the conveying reducer 602 is connected to one end of the gear shaft 603 via the universal coupling 604. The driving gear 607 is mounted on the other end of the gear shaft 603 via a key. The driving gear 607 meshes with the driven gear 608 for transmission. The driven gear 608 is mounted on the driving conveying roller 614 via a key. On the extended shaft 14, the gear shaft 603 and the active conveyor roller 614 are installed in the pressing frame 606 in order from top to bottom via bearings. The pressing frame 606 is equipped with a clamping cylinder 605 on its upper surface. The clamping cylinder 605 is fixedly installed on the fixed frame 612. Under the driving action of the clamping cylinder 605, the pressing frame 606 slides in the fixed frame 612 to realize the active conveyor roller 614 clamping the seamless tube blank. The driven conveyor roller 613 is installed in the fixed frame 612 via bearings. The rotation axis of the driven conveyor roller 613 is lower than the machining center line. The distance from the surface of the driven conveyor roller 613 to the machining center line is the outer radius of the seamless tube blank. The fixed frame 612 is installed on the foundation.

[0057] The mandrel propulsion mechanism includes a lifting cylinder 611, a propulsion cylinder 609, and a cylinder support 610. The lifting cylinder 611 is mounted on the foundation, and the piston rod is connected to the cylinder support 610. The center line of the piston rod intersects the machining center line, and the piston rod runs perpendicular to the ground and upwards. A slider is mounted on a fixed frame 612 on one side of the cylinder support 610 to ensure that the cylinder support 610 moves perpendicular to the machining center line when the lifting cylinder 611 is running. The propulsion cylinder 609 is mounted on the other end of the cylinder support 610. The propulsion cylinder 609 is mounted on the side of the cylinder support 610, and the center line of the piston rod is parallel to the machining center line. The piston rod runs in the direction of the mandrel 7 being fed in.

[0058] In this embodiment, two sets of parallel-arranged active conveyor rollers 614 are used, and the active gear 607 simultaneously meshes with two driven gears 608.

[0059] In this embodiment, when the mandrel 7 is retracted to the limit position, the lifting cylinder 611, the pushing cylinder 609, the cylinder bracket 610 and the mandrel limiting section 704 do not interfere with each other.

[0060] In this embodiment, when the mandrel limiting section 704 is in the extreme position, the spinning section 701 covers the deformation zone of the spinning mechanism.

[0061] In this embodiment, the mandrel conveying mechanism operates on the connecting section 702 between the support section 703 and the limiting section 704;

[0062] In this embodiment, the relative position of the spinning section 701 and the deformation zone of the spinning mechanism is adjusted by adding shims between the mandrel limiting section 704 and the fixed frame 612;

[0063] In this embodiment, the mandrel 7 is a four-structure slender shaft. The four structures are: a spinning section 701 that supports the plastic deformation of the spinning mechanism, a support section 703 that supports the tail end of the processed tube, a limiting section 704 that limits the extreme position of the spinning section, and a connecting section 702 that connects the sections. The diameter of the spinning section 701 is approximately equal to the inner diameter of the seamless tube blank, with a slight gap between them. The support section 703 is a disc with the same diameter as the spinning section 701. The limiting section 704 is a frustum structure with an outer diameter larger than that of the connecting section 702. The connecting section 702 is a slender shaft with a diameter smaller than that of the spinning section 701 and the support section 703, and it does not contact the inner wall of the seamless tube blank during processing.

[0064] In this embodiment, the mandrel tailstock 8 is a hollow sleeve, the center line of the sleeve coincides with the machining center line, the inner diameter of the sleeve is larger than the outer diameter of the limiting section 704, and the length of the sleeve is larger than the length of the seamless tube blank.

[0065] The cooling system 10 includes a hollow annular support, coolant, and a pump. The hollow annular support is arranged outside the through hole of the machining center of the spinning mechanism and is coaxial with the machining center line. The diameter of the hollow annular support is larger than the outer diameter of the seamless tube billet. n (n=1,2,3...) circular holes are evenly arranged along the circumference of the hollow annular support, penetrating to the inner wall of the hollow annular support. The opening direction points to the machining area of ​​the spinning mechanism, which serves as a channel for coolant to flow out. The coolant is pumped to the hollow annular support under the drive of the pump and evenly sprayed on the entire circumferential area of ​​the machining area.

[0066] The coolant is cooling water, emulsion, or cooling oil.

[0067] The equipment workflow includes the following steps:

[0068] Step 1: First, the mandrel conveying mechanism runs in reverse to retract the mandrel 7 to its limit position. The seamless tube blank is placed on the roller assembly 5 through the tube transfer mechanism. At this time, the end of the seamless tube blank is located a certain distance outside the end face of the spinning mechanism 4.

[0069] Step 2: The mandrel conveying mechanism operates, inserting the mandrel 7 through the hole into the seamless tube blank. The mandrel spinning section 701 makes gap contact with the inner surface of the seamless tube blank. Finally, the mandrel spinning section 701 is located at the extreme position of the seamless tube blank near the spinning mechanism 4. At this time, the lifting cylinder 611 and the connected cylinder support 610 are at the lowest position.

[0070] Step 3: The mandrel pushing mechanism operates, the lifting cylinder 611 drives the cylinder support 610 to move upward to the position where the center line of the pushing cylinder coincides with the machining center line, the pushing cylinder 609 operates, and presses the mandrel limiting section 704 to the limit position to abut against the fixed frame 612. At this time, the seamless tube billet and the mandrel 7 move together to the position of the spinning mechanism 4.

[0071] Step 4: Run the tube drawing assembly 2, so that the hollow torsion shaft 205 is connected to the through pin hole at one end of the seamless tube blank through the pin shaft. Then, start the spinning mechanism 4, cooling system 8, tube drawing assembly 2 and drive assembly 1 in sequence. Under the combined action of tube drawing assembly 2 and drive assembly 1, the seamless tube blank rotates actively in the circumferential direction and moves away from the spinning mechanism 4 in the axial direction to complete the processing.

[0072] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary rather than restrictive in all respects. Various modifications and improvements to the technical solutions of the present invention made by those skilled in the art without departing from the spirit of the invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A complete set of equipment for seamless tube spinning and forming, characterized in that: It includes a drive assembly (1) arranged in sequence for driving the tube drawing assembly (2) to move, a tube drawing assembly (2) for fixing and pulling the seamless tube blank, a front end (3) for mounting the tube drawing assembly (2) and the drive assembly (1), a spinning mechanism (4) for seamless tube processing, a roller assembly (5) for center positioning and support of the seamless tube blank, a mandrel feeding assembly (6) for positioning the mandrel (7) and the seamless tube blank, a back end (9) for mounting the roller assembly (5), and a cooling system (10) for local cooling of the spinning mechanism (4) and the seamless tube. The drive assembly (1) includes a sprocket motor (101), a coupling (102), a sprocket reducer (103), a sprocket shaft (104), a sprocket (105), and a plate chain; the output shaft of the sprocket motor (101) is connected to the input shaft of the sprocket reducer (103) through the coupling (102), and the end of the sprocket shaft (104) is provided with a keyway, through which the sprocket (105) is connected, and the sprocket (105) meshes with the plate chain; The sprocket shaft (104) outputs from both ends, each connected to a sprocket (105). The two sprockets (105) respectively mesh with and connect to two rows of parallel plate chains. The two rows of parallel plate chains are arranged symmetrically about the processing center line of the spinning mechanism (4). The tube-drawing assembly (2) includes a torsion motor (201), a torsion reducer (202), a torsion coupling (203), an intermediate shaft (204), a hollow torsion shaft (205), a base mounting trolley (206), a concave box beam (207), a gear-shaping mechanism (208), and a hydraulic cylinder (209). The output end of the torsion motor (201) is connected to the input end of the torsion reducer (202). The torsion reducer (202) is fixed on the base mounting trolley (206), and its output end is connected to the intermediate shaft (204) through the torsion coupling (203). The intermediate shaft (204) is mounted in the intermediate shaft bearing seat on the base mounting trolley (206) through bearings to reduce the bending and torsion of the reducer shaft. The output end of the intermediate shaft (204) is connected to the hollow torsion shaft (205), and the other end of the hollow torsion shaft (205) is aligned with the center. The cylindrical pin hole is connected and has the same size as the pin hole pre-machined at one end of the seamless tube blank. The outer diameter of the end of the seamless tube blank with the pin hole is smaller than the inner diameter of the hollow torsion shaft (205) and there is a certain gap. Four sets of wheel mechanisms (210) are installed at the bottom of the base mounting trolley. The concave box beams (207) are arranged in pairs and placed on both sides of the base mounting trolley (206) and are symmetrical with respect to the machining center line. The concave box beams (207) extend outward to form an installation platform. The gear-shaping mechanism (208) is a square structure installed in the corresponding through square groove of the installation platform. The upper plane is connected to the oil cylinder (209) and the lower plane is a tooth structure. The tooth structure meshes with the drive component plate chain. The oil cylinder (209) is installed and fixed on the fixed plane above the installation platform. The direction of the oil cylinder (209) shaft movement is parallel to the pressing direction of the tooth structure. The spinning mechanism (4) includes an annular cylindrical mold, the annular curved surface of which contacts the outer surface of the seamless tube blank and is pressed into the seamless tube blank radially, the pressing depth forming a thinning amount Δt; The idler assembly (5) consists of an idler motor (501), an idler (502), and a hydraulic lever (503); The mandrel feeding assembly (6) includes a mandrel (7) for supporting the inner wall support during the deformation of the seamless tube, a mandrel tailstock (8) for storing the mandrel, and a mandrel conveying mechanism and a mandrel pushing mechanism for realizing continuous feeding of the mandrel; The mandrel conveying mechanism includes a conveying motor (601), a conveying reducer (602), a gear shaft (603), a universal coupling (604), a driving gear (607), a driven gear (608), a driving conveying roller (614), a driven conveying roller (613), a clamping cylinder (605), a pressing frame (606), and a fixed frame (612). The output shaft of the conveying motor (601) is connected to the input shaft of the conveying reducer (602). The output shaft of the conveying reducer (602) is connected to one end of the gear shaft (603) via the universal coupling (604). The driving gear (607) is mounted on the other end of the gear shaft (603) via a key. The driving gear (607) meshes with the driven gear (608). In a contact drive, the driven gear (608) is mounted on the extended shaft of the driving conveyor roller (614) via a key. The gear shaft (603) and the driving conveyor roller (614) are mounted in the pressing frame (606) in a top-to-bottom order via bearings. A clamping cylinder (605) is provided on the upper surface of the pressing frame (606). The clamping cylinder (605) is fixedly mounted on the fixed frame (612). The pressing frame (606) slides in the fixed frame (612) under the driving action of the clamping cylinder (605). The driven conveyor roller (613) is mounted on the fixed frame (612) via bearings. The rotation axis of the driven conveyor roller (613) is lower than the machining center line. The fixed frame (612) is mounted on the foundation. The mandrel propulsion mechanism includes a lifting cylinder (611), a propulsion cylinder (609), and a cylinder support (610). The cylinder body of the lifting cylinder (611) is installed on the foundation, and the piston rod of the cylinder is connected to the cylinder support (610). The center line of the piston rod intersects with the machining center line, and the piston rod runs vertically upwards. A slider is installed on one side of the cylinder support (610) and mounted on a fixed frame (612) to ensure that the cylinder support (610) moves perpendicular to the machining center line when the lifting cylinder (611) is running. The other end of the cylinder support (610) is equipped with a propulsion cylinder (609). The propulsion cylinder (609) is installed on the side of the cylinder support (610), and the center line of the piston rod is parallel to the machining center line. The piston rod runs in the direction of the mandrel (7) being fed in. The mandrel (7) is a four-structure slender shaft. The four structures are a spinning section (701) that supports the plastic deformation of the spinning mechanism, a support section (703) that supports the tail end of the processed tube, a limiting section (704) that limits the extreme position of the spinning section, and a connecting section (702) that connects the sections. The diameter of the spinning section (701) is approximately equal to the inner diameter of the seamless tube blank, with a slight gap between them. The support section (703) is a disc with the same diameter as the spinning section (701). The limiting section (704) is a frustum structure with an outer diameter larger than that of the connecting section (702). The connecting section (702) is a slender shaft with a diameter smaller than that of the spinning section (701) and the support section (703), and it does not contact the inner wall of the seamless tube blank during processing. The mandrel tailstock is a hollow sleeve with the center line of the sleeve coinciding with the machining center line. The inner diameter of the sleeve is greater than the outer diameter of the limiting section (704), and the length of the sleeve is greater than the length of the seamless tube blank. The cooling system (10) includes a hollow annular support, coolant, and a pump. The hollow annular support is arranged outside the through hole of the machining center of the spinning mechanism and is coaxial with the machining center line. The diameter of the hollow annular support is larger than the outer diameter of the seamless tube blank. N circular holes are evenly arranged along the circumference of the hollow annular support, penetrating to the inner wall of the hollow annular support. The opening direction points to the machining area of ​​the spinning mechanism, which serves as a coolant outlet channel. The coolant is pumped to the hollow annular support under the driving action of the pump and evenly sprayed on the entire circumferential area of ​​the machining area.

2. The seamless tube spinning and forming complete set of equipment according to claim 1, characterized in that: The front end (3) includes two sets of support structures and tracks. Each component is arranged in pairs in parallel and symmetrical arrangement, with a certain interval between the two components. The support structure includes an upper longitudinal beam (301), a support beam (302), and a lower longitudinal beam (303). The upper longitudinal beam (301) is a channel steel with the channel steel opening upward. The structure of the lower longitudinal beam (303) is the same as that of the upper longitudinal beam (301), with the same opening direction. The support beam (302) is a channel steel with the channel steel opening outward and arranged on both sides of the short side of the upper longitudinal beam (301) and the lower longitudinal beam (303). The support beam is connected to the upper longitudinal beam (301) and the lower longitudinal beam (303) by welding. There are two tracks (304) arranged on the two sets of support structures. The spacing between the tracks (304) is the same as the spacing between the wheel mechanism (210).

3. The seamless tube spinning and forming complete set of equipment according to claim 2, characterized in that: The sheet chain is laid flat in the groove of the upper longitudinal beam (301) of the front end (3). After looping back to the upper longitudinal beam (301) from one end of the front end (3) to the other end, the sheet chain connects with the drive component sprocket through the groove of the lower longitudinal beam (303) to form a closed loop.

4. The seamless tube spinning and forming complete set of equipment according to claim 2, characterized in that: The wheel mechanism (210) is placed symmetrically and parallel to each other on the track (304) of the front desk (3).

5. The seamless tube spinning and forming complete set of equipment according to any one of claims 1-4, characterized in that: The workflow of this device includes the following steps: Step 1: First, the mandrel conveying mechanism runs in reverse to retract the mandrel (7) to the limit position. The seamless tube blank is placed on the roller assembly (5) through the tube transfer mechanism. At this time, the end of the seamless tube blank is located a certain distance outside the end face of the spinning mechanism (4). Step 2: The mandrel conveying mechanism operates, and the mandrel (7) is pierced into the seamless tube blank. The mandrel spinning section (701) is in gap contact with the inner surface of the seamless tube blank. Finally, the mandrel spinning section (701) is located at the extreme position of the seamless tube blank near the spinning mechanism (4). At this time, the lifting cylinder (611) and the connected cylinder bracket (610) are at the lowest position. Step 3: The mandrel pushing mechanism operates, the lifting cylinder (611) drives the cylinder support (610) to move upward to the position where the center line of the pushing cylinder coincides with the machining center line, the pushing cylinder (609) operates, and presses the mandrel limiting section (704) to the limit position to abut against the fixed frame (612). At this time, the seamless tube blank and the mandrel (7) move together to the position of the spinning mechanism (4); Step 4: Run the tube drawing assembly (2) to connect the hollow torsion shaft (205) with the through pin hole at one end of the seamless tube blank through the pin shaft. Then start the spinning mechanism (4), cooling system (10), tube drawing assembly (2), and drive assembly (1) in sequence. Under the combined action of tube drawing assembly (2) and drive assembly (1), the seamless tube blank rotates actively in the circumferential direction and moves away from the spinning mechanism (4) in the axial direction to complete the processing.

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