A U-shaped cross-section annular cavity spinning device and spinning method

Abstract

The invention discloses a U-shaped cross-section annular cavity spinning device and a spinning method. The device comprises a frame, a spinning punch and a spinning die. The spinning punch and the spinning die are both connected to the frame. The spinning punch comprises a support beam and a rotatable rolling wheel arranged on the support beam. At least two rolling wheels are evenly arranged. The rolling wheel serves as a mold protruding part of the spinning punch. The rolling wheel is arranged on an annular ring track. The spinning die is fixedly provided with a cavity mold. The cavity mold is provided with an open annular space. The opening of the annular space faces the spinning punch. The annular space serves as a mold recessed part of the spinning die. The cavity mold is used for fixedly supporting a workpiece. The spinning punch or the spinning die is connected to a driving device. The spinning punch and the spinning die rotate relatively and gradually approach each other. The U-shaped cross-section annular cavity is gradually spun down. The required pressure is small, the equipment investment is small, and the forming speed is fast.

Description

Technical Field

[0001] The invention relates to the technical field of spinning, and in particular to a processing device and a processing method for an annular cavity with a U-shaped cross-section. Background Art

[0002] At present, the U-shaped cross-section annular cavity, such as Figure 8 The turbine for the hydraulic coupling shown in the figure is traditionally manufactured using a 1,000-ton press for forging and forming, and requires at least two forging processes. The forging equipment has high requirements, requires large equipment investment, occupies a large space, and has high energy consumption. In addition, the forged products are prone to tearing quality problems. Summary of the invention

[0003] The present invention provides a processing device and a processing method for a special annular cavity, specifically a U-section annular cavity spinning device and a spinning method, which has the characteristics of low cost, low energy consumption and small space occupation.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0005] A U-section annular cavity spinning device comprises a frame, a spinning punch and a spinning die. The spinning punch and the spinning die are both connected to the frame. The spinning punch comprises a support beam and a rotatable rolling wheel arranged on the support beam. At least two rolling wheels are evenly arranged. The rolling wheel serves as a protruding part of the die of the spinning punch. The rolling wheel is arranged on an annular ring track. The spinning die is fixedly provided with a cavity die. The cavity die is provided with an open annular space. The opening of the annular space faces the spinning punch. The annular space serves as a recessed part of the die of the spinning die. The cavity die is used to fix and support a workpiece. The spinning punch or the spinning die is connected to a driving device. The spinning punch and the spinning die rotate relatively and gradually approach each other. The rolling wheel moves toward the annular space. The wheel surface of the rolling wheel contacts and rotates with the workpiece. The spinning punch and the spinning die continue to approach each other. The rolling wheel extends into the annular space and gradually rolls out an annular cavity on the workpiece.

[0006] The annular space and the annular ring trajectory are always parallel, and the annular shapes of the two match the annular cavity of the finished product. The annular groove pressed by the rolling wheel on the workpiece is the annular cavity groove of the finished product.

[0007] The protruding part of the spinning punch and the concave part of the spinning die cooperate with each other to complete the modeling process of the target model.

[0008] The rolling wheel is a rotatable wheel, including a wheel body and a wheel axle. The wheel body is connected to the wheel axle. The spinning punch also includes a support beam. The wheel axle is fixedly connected to the support beam through a fixed frame. The outer shape formed by the wheel surface and shoulder of the wheel body, that is, the outer contour of the wheel body cross-section close to the wheel surface is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spin-formed; the cross-sectional arc of the wheel surface where the rolling wheel is displaced and extends into the annular space is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spin-formed.

[0009] When there are two rolling wheels, the point between the two rolling wheels is the center point; when there are more than two rolling wheels, they are evenly distributed in a circle, with the center of the circle being the center point, and the center axis of the annular space of the spinning die passes through the above center point; the wheel axle of the rolling wheel is perpendicular to the above center axis.

[0010] The device also includes an auxiliary wheel, which is fixedly connected to the support beam, and the auxiliary wheel and the rolling wheel are arranged on the same annular ring track, and the auxiliary wheel is arranged between two adjacent rolling wheels. The auxiliary wheel is arranged obliquely, and its wheel surface curve includes an arc. When the auxiliary wheel and the rolling wheel at the same horizontal rotation angle have vertical cross-sectional views through their wheel axes overlap, the wheel surface curve of the auxiliary wheel protrudes outwardly relative to the side of the rolling wheel curve, and intersects with a part of the side profile curve of the rolling wheel. The curve formed by the protruding wheel surface curve of the auxiliary wheel and the wheel surface curve of part of the rolling wheel is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spun;

[0011] The auxiliary wheel comprises a wheel body II, a wheel axle, and a wheel frame. The wheel body II is rotatable and connected to the wheel frame through the wheel axle. The wheel frame is fixedly connected to a fixed frame or a supporting beam of the rolling wheel.

[0012] Furthermore, the protruding wheel surface curve of the auxiliary wheel and the wheel surface curve of the rolling wheel have a natural transition at the intersection, that is, the protruding arc of the auxiliary wheel 25 and the wheel surface curve of the rolling wheel form a continuous arc, and the two arcs are tangent at the intersection at the lower end.

[0013] In actual operation, an annular cavity can be rolled out by a rolling wheel alone, but the side of the rolling wheel will produce friction with the side of the cavity, especially the outer side of the cavity, affecting the surface quality of the cavity. Through the design of the auxiliary wheel, the side cavity is rolled out by the inclined auxiliary wheel, the friction surface is effectively reduced, which helps to improve the surface quality of the cavity.

[0014] Furthermore, the positioning and calibration process is to place the rolling wheel and the auxiliary wheel of the support beam in the annular cavity of the finished product, ensuring that the two rings are concentric, part of the wheel surface of the rolling wheel fits with the cavity shape, and there is a gap between the outer part and the outside of the cavity shape. At this time, the wheel surface of the auxiliary wheel is adjusted to fit with the outside of the cavity shape, and the lower end of the fitting surface with the cavity shape should be lower than the upper end of the fitting surface of the rolling wheel on the same side and the cavity shape.

[0015] The auxiliary wheels are arranged on the outside or on both sides. Because the inner cavity is shallower, auxiliary wheels may not be arranged.

[0016] The fixing frame comprises a connecting seat and an axle frame plate. The connecting seat is connected to the rolling wheel support beam by bolts. The axle frame plate is perpendicular to the connecting seat and is arranged on both sides of the rolling wheel and connected to the wheel axle of the rolling wheel.

[0017] Furthermore, the arc cross-section of the wheel surface where the rolling wheel is displaced and extends into the annular space is the same as or similar to the U-shaped cross-section of the annular cavity after the workpiece is spin-formed.

[0018] The cavity mold includes an inner platform arranged in the center and an outer platform arranged outside the inner platform. There is an annular space between the inner platform and the outer platform. Both the inner platform and the outer platform are provided with a flat upper surface, which plays a supporting role. The annular space is an annular groove with a U-shaped cross-section or a ring with a rectangular or right-angled trapezoidal cross-section.

[0019] The annular space between the inner platform and the outer platform constitutes the recessed part of the spinning die, and the bottoms of the inner platform and the outer platform are integrally connected to form an annular groove with a U-shaped cross-section; or the inner platform has a cylindrical outer wall, and the outer platform is provided with an inner cylindrical groove, forming an annular groove between the inner platform and the outer platform.

[0020] The opening edge of the annular space is provided with a chamfer to facilitate smooth deformation of the product during the profiling process; according to specific production requirements, the upper surface heights of the inner table and the outer table are the same or different.

[0021] After the rolling wheel extends into the annular space, the edge of the rolling wheel is close to the edges of the inner and outer tables, ensuring that when the workpiece is pressed, the edges of the inner and outer tables act as support points. Under the joint action of the rolling wheel and the edges, the workpiece is pressed.

[0022] The center of the inner platform is provided with a protrusion for positioning the workpiece, the center of the workpiece is provided with a hole, and the protrusion passes through the hole to limit the workpiece.

[0023] Furthermore, the wheel body bearing of the above-mentioned rolling wheel is a steel-backed bearing, and the grease is a high-temperature grease; the U-shaped cross-sectional shape similar to the finished annular cavity of the workpiece is defined as: the outer dimensions of the wheel body are slightly smaller than the U-shaped cross-sectional shape of the finished annular cavity of the workpiece, that is, the cavity shape pressed out by the rolling wheel is slightly smaller than the cavity shape of the final finished annular cavity, so that there is room for processing, which is convenient for further cavity surface treatment of the product after spinning.

[0024] Furthermore, it also includes a edging wheel, which is arranged on the outside of the rolling wheel and coaxially connected to the rolling wheel. Its wheel diameter is smaller than the rolling wheel. The cross-section of the wheel surface of the edging wheel is generally rectangular, and can also be set accordingly according to the specific edging shape.

[0025] Furthermore, a wheel axle support is provided to be in contact with the wheel axle, one end of the wheel axle support is fixedly connected to the support beam, and the other end is connected to the edge rolling wheel through the thrust bearing I to ensure the stability of the edge rolling wheel. The rotating end of the thrust bearing I is connected to the side of the edge rolling wheel to ensure the stability of the edge rolling wheel. For example, the turbine in the hydraulic coupler only needs an annular cavity shape, while the pump wheel needs to connect the inner and outer flanges. Through the edge rolling wheel design, the annular cavity of the pump wheel and the outer flange can be formed in one piece without the need for additional welding.

[0026] At least one of the spinning punch and the spinning die is a rotating die that rotates about its central axis; and at least one of the spinning die is a displacement die that moves closer to the other die.

[0027] The action combination of the spinning punch and the spinning die is any one of the following combinations:

[0028] ① The spinning punch is the displacement side, which moves toward the spinning die, and the spinning die is the rotation side, which rotates in place;

[0029] ② The spinning punch is the rotating party, rotating in place, and the spinning die is the displacement party, displacing towards the spinning punch;

[0030] ③ The spinning punch remains stationary, while the spinning die is both a rotating and displacement party;

[0031] ④ The spinning punch is a displacement party, and the spinning die is both a rotation party and a displacement party, and both are displaced toward the middle;

[0032] ⑤ The spinning punch is a rotating die in place, and the spinning die is a rotating die and a displacement die at the same time;

[0033] ⑥ The spinning punch is both a displacement and a rotation party, and the spinning die remains stationary;

[0034] ⑦ The spinning punch is both a displacement and a rotation party, while the spinning die is an in-situ rotation party;

[0035] ⑧ The spinning punch is both a displacement and rotation party, and the spinning die is a displacement party, and both are displaced toward the middle;

[0036] ⑨ The spinning punch is both a displacement and a rotation party, and the spinning die is both a displacement and a rotation party.

[0037] The nine combinations are shown in the following table, where ↓ represents positive displacement, の represents rotation, and ↑ represents reverse displacement.

[0038]

[0039] The driving device used as the displacement means in the above combinations ①, ②, and ④ is a lifting screw nut mechanism or a hydraulic cylinder mechanism. The screw in the lifting screw nut mechanism is connected to the motor for rotation, and the movable end of the nut or hydraulic cylinder mechanism is connected to the displacement means to linearly drive the displacement means to move.

[0040] In the above combinations, the driving device for the rotating side in ①, ②, and ⑦ is a motor transmission mechanism, the motor output end of the motor transmission mechanism is connected to the rotating side through a chain, and the rotating side is provided with a sprocket connected to the chain;

[0041] The driving device for both the rotating party and the displacement party in the above combinations ③-⑨ is composed of the above displacement party driving device and the rotating party driving device, that is, the displacement party driving device drives the rotating party and the rotating party driving device to move simultaneously;

[0042] In the above combinations ⑥, ⑦, and ⑨, when the spinning punch is used as both the rotating party and the displacement party, the driving device includes a sprocket I, a motor I, a spline sleeve, a screw rod, and a nut. The motor I is connected to the sprocket I through a chain, the sprocket I is fixedly connected to the spline sleeve, the upper part of the screw rod is provided with a spline groove, the middle and lower parts are provided with a thread, the nut is fixedly connected to the frame, the spline sleeve is connected to the screw rod through a spline, the screw rod is connected to the spline sleeve for vertical sliding connection, the screw rod is threadedly connected to the nut, and the lower end of the screw rod is fixedly connected to the spinning punch.

[0043] Furthermore, the motor I is fixedly connected to the frame, and the spline sleeve is connected to the frame through the bearing seat.

[0044] The frame includes a gantry, a hydraulic cylinder mechanism or a lifting screw nut mechanism is fixedly arranged at the top of the gantry, the movable end of the hydraulic cylinder mechanism or the nut is connected to the back side of the support beam, two rolling wheels are fixedly arranged on the front side of the support beam, and the two ends of the support beam are slidably connected to the gantry; the spinning die includes a cavity die and a support seat, the cavity die is fixedly connected to the support seat, the support seat is provided with a sprocket, the support seat is slidably and rotatably connected to the frame, and it is connected to the output end of the motor through a chain.

[0045] Furthermore, it also includes a base, which is fixedly connected to the gantry, and the support seat is connected to the base through a bearing, and the support seat can rotate under the drive of a chain.

[0046] Furthermore, the gantry comprises a top beam and two vertical beams, the hydraulic push rod is fixed on the top beam and parallel to the vertical beams, vertical guide rails are arranged on the inner sides of the two vertical beams, the two ends of the support beam are slidably connected to the guide rails, and the support beam is linearly displaced along the push rod direction through the guide rail limiter; an X-shaped folding frame is arranged between the support beam and the top beam as a guiding device to ensure that the displacement party does not rotate and is displaced along the central axis of the rotating party, the X-shaped folding frame comprises a frame rod hinged together in an X shape at the center, the upper left end and the lower left end of the X-shaped folding frame are respectively hinged to the top beam and the support beam, the upper right end and the lower right end of the X-shaped folding frame are slidably connected to a plate with an oblong hole through a pin shaft, and the plate with the oblong hole is respectively fixed to the lower right end of the top beam and the upper right end of the support beam; the vertical guide rail comprises two convex ridge tracks fixed on the inner sides of the vertical beams in parallel, and the two ends of the support beam slide on the tracks; the end of the support beam is also fixedly connected to a triangular support plate, the outer end surface of the triangular support plate is flush with the end surface of the support beam, and is slidably connected to the vertical guide rail.

[0047] Furthermore, the support seat is connected to the base through a deep groove ball bearing, and the lower end surface of the spun support seat is connected to the upper end surface of the base through a thrust bearing II.

[0048] For example, the turbine in the hydraulic coupling only needs an annular cavity shape, while the pump wheel needs to connect the inner and outer flanges. Through the design of the rolled edge wheel, the annular cavity of the pump wheel and the outer flange can be formed as one piece without the need for additional welding.

[0049] A spinning method using the above-mentioned U-shaped cross-section annular cavity spinning device comprises the following steps:

[0050] (1) Heating the workpiece with a hole in the center

[0051] The workpiece is heated to make it have stronger ductility, and the heated workpiece is the blank.

[0052] Furthermore, the workpiece is heated to a red-hot state by an electric furnace. For example, the annular cavity blank for the hydraulic coupler in this case needs to be heated to 1000-1100 degrees Celsius.

[0053] (2) Spinning molding:

[0054] Carry out annular cavity molding: fix the blank on the spinning die cavity mold, the rolling wheel is used as the protruding part of the spinning punch, and the annular space of the cavity mold is used as the concave part of the spinning die. The spinning punch and the spinning die rotate relatively and gradually approach each other. The rolling wheel moves toward the annular space, and the wheel surface of the rolling wheel contacts and rotates with the workpiece. The spinning punch and the spinning die continue to approach each other, and the rolling wheel extends into the annular space to gradually roll out an annular cavity on the blank.

[0055] Step (2) also includes outer flange rolling: the rolling wheel and the rolling wheel act on the blank at the same time, pressing the blank outside the blank annular cavity to form the annular cavity and the outer flange;

[0056] Step (2) also includes forging the inner flange: after spinning, an auxiliary press plate is placed in the center of the blank, and the spinning punch is pressed against the press plate to forge the middle part of the blank annular cavity.

[0057] Subsequent steps also include slowly cooling the blank after shaping to remove stress.

[0058] This method is used for U-shaped head modeling.

[0059] The entire process from the blank coming out of the high-temperature furnace to the spinning forming takes less than 2 minutes. The blank is always kept above 700℃, and the product is quickly formed.

[0060] The beneficial effects of the present invention are:

[0061] (1) The U-shaped cross-section annular cavity is spun down gradually, and the required pressure is small. For example, the worm gear ring for the hydraulic coupling only needs one percent of the pressure of the traditional forging method. Therefore, the investment in equipment is greatly reduced, and the equipment is small in size, has low maintenance costs, and is easy to transport;

[0062] (2) Since the U-shaped annular cavity is gradually deformed, the possibility of tearing and strength reduction quality problems is completely avoided;

[0063] (3) The product is formed in one process. The entire U-shaped cavity spinning process generally takes about 2 minutes, and the forming speed is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0065] Figure 2 It is a schematic diagram of the structure of Embodiment 2 and Embodiment 5 of the present invention;

[0066] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0067] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0068] Figure 5 It is a schematic diagram of the structure of Embodiment 6 and Embodiment 7 of the present invention;

[0069] Figure 6 It is a schematic diagram of the structure of Embodiment 8 and Embodiment 9 of the present invention;

[0070] Figure 7 It is a schematic diagram of the structure of the cavity mold and the spinning punch;

[0071] Figure 8 It is a schematic diagram of the structure of a turbine for a fluid coupling;

[0072] Fig. 9 It is a schematic diagram of the layout of three rolling wheels;

[0073] Fig.10 Schematic diagram of the position of the rolling wheel and the annular space;

[0074] Fig.11 is a schematic diagram of the structure of the auxiliary wheel from a top view;

[0075] Fig.12 This is a schematic diagram of the auxiliary wheel side structure;

[0076] Fig.13 It is a schematic diagram of the connection between the auxiliary wheel surface curve and the rolling wheel surface curve.

[0077] 1-frame, 2-support beam, 3-rolling wheel, 4-cavity mold, 5-fixed frame, 6-edging wheel, 7-wheel axle support, 8-hydraulic push rod I, 9-support seat, 10-base, 11-folding frame, 12-protrusion, 13-annular space, 14-guide rail, 15-inner table, 16-outer table, 17-thrust bearing I, 18-hydraulic push rod II, 19-sprocket II, 20-rotating shaft, 21-nut, 22-screw, 23-spline sleeve, 24-sprocket III, 25-auxiliary wheel, 26-wheel body II, 27-wheel frame. DETAILED DESCRIPTION

[0078] Embodiment 1, as Figure 1 The U-section annular cavity spinning device shown comprises a frame 1, a spinning punch and a spinning die. Both the spinning punch and the spinning die are connected to the frame 1. The spinning punch comprises a support beam 2 and a rotatable rolling wheel 3 arranged on the support beam 2. Two rolling wheels 3 are arranged. The rolling wheel 3 serves as the protruding part of the mold of the spinning punch. The rolling wheel 3 is arranged on an annular ring track. The spinning die is fixedly provided with a cavity mold 4. The cavity mold 4 is provided with an open annular space 13. The opening of the annular space 13 faces the spinning punch. The annular space 13 serves as the recessed part of the mold of the spinning die. The cavity mold 4 is used to fix and support the workpiece. The spinning punch or the spinning die is connected to a driving device. The spinning punch and the spinning die rotate relative to each other and gradually approach each other. The rolling wheel 3 moves toward the annular space 13. The wheel surface of the rolling wheel 3 contacts and rotates with the workpiece. The spinning punch and the spinning die continue to approach each other. The rolling wheel 3 extends into the annular space 13 to gradually roll out an annular cavity on the workpiece.

[0079] The rolling wheel 3 is a rotatable wheel, including a wheel body and a wheel axle, the wheel body is connected to the wheel axle, the spinning punch also includes a support beam 2, the wheel axle is fixedly connected to the support beam 2 through a fixing frame 5, the outer shape formed by the wheel surface and the shoulder of the wheel body, that is, the outer contour of the wheel body cross section close to the wheel surface is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spin-formed; the cross-sectional arc of the wheel surface of the rolling wheel 3 that is displaced and extends into the annular space 13 is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spin-formed.

[0080] The device also includes an auxiliary wheel 25, which is fixedly connected to the support beam 2. The auxiliary wheel 25 and the rolling wheel 3 are arranged on the same annular track. The auxiliary wheel 25 is arranged between two adjacent rolling wheels 3. The auxiliary wheel 25 is inclined, and its wheel surface curve includes an arc. When the vertical cross-sectional views of the auxiliary wheel 25 and the rolling wheel 3 at the same horizontal rotation angle through their wheel axes coincide, the wheel surface curve of the auxiliary wheel 25 is relatively convex outward and intersects with a part of the side profile curve of the rolling wheel 3. The curve formed by the convex wheel surface curve of the auxiliary wheel 25 and the wheel surface curve of part of the rolling wheel 3 is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spun.

[0081] The auxiliary wheel 25 includes a wheel body II 26, a wheel axle, and a wheel frame 27. The wheel body II 26 is rotatable and connected to the wheel frame 27 through the wheel axle. The wheel frame 27 is fixedly connected to the fixed frame 5 or the support beam of the rolling wheel 3.

[0082] Furthermore, the protruding wheel surface curve of the auxiliary wheel 25 and the wheel surface curve of the rolling wheel 3 have a natural transition at the intersection, that is, the protruding arc of the auxiliary wheel 25 and the wheel surface curve of the rolling wheel 3 form a continuous arc, and the two arcs are tangent at the intersection at the lower end.

[0083] In actual operation, the annular cavity can be rolled out by the rolling wheel 3 alone, but the side of the rolling wheel 3 will produce friction with the side of the cavity, especially the cavity surface on the outer side, affecting the surface quality of the cavity. Through the design of the auxiliary wheel 25, the side cavity is rolled out by the inclined auxiliary wheel 25, and the friction surface is effectively reduced, which helps to improve the surface quality of the cavity.

[0084] Furthermore, the positioning and calibration process is to place the rolling wheel 3 and the auxiliary wheel 25 of the support beam 2 in the annular cavity of the finished product, ensuring that the two rings are concentric, part of the wheel surface of the rolling wheel 3 fits with the cavity shape, and there is a gap between the outer part and the outside of the cavity shape. At this time, the wheel surface of the auxiliary wheel 25 is adjusted to fit with the outside of the cavity shape, and the lower end of the fitting surface with the cavity shape should be lower than the upper end of the fitting surface of the rolling wheel 3 on the same side and the cavity shape.

[0085] The cavity mold 4 is Figure 7 In the structure shown, the inner platform 15 has a cylindrical outer wall, and the outer platform 16 is provided with an inner cylindrical groove, and an annular groove is formed between the inner platform 15 and the outer platform 16.

[0086] The fixing frame 5 includes a connecting seat and an axle frame plate. The connecting seat is connected to the support beam 2 of the rolling wheel 3 by bolts. The axle frame plate is perpendicular to the connecting seat and is arranged on both sides of the rolling wheel 3 and connected to the axle of the rolling wheel 3.

[0087] Furthermore, the wheel bearing of the rolling wheel 3 is a steel back bearing, and the lubricating grease is a high temperature lubricating grease;

[0088] The cavity mold 4 includes an inner platform 15 arranged at the center, and an outer platform 16 arranged outside the inner platform 15. There is an annular space 13 between the inner platform 15 and the outer platform 16. Both the inner platform 15 and the outer platform 16 are provided with a flat upper surface, which plays a supporting role. The annular space 13 is an annular groove with a U-shaped cross section or a ring with a rectangular or right-angled trapezoidal cross section. The annular space 13 between the inner platform 15 and the outer platform 16 constitutes the mold recessed part of the spinning die. The bottom of the inner platform 15 and the outer platform 16 are integrally connected to form an annular space 13 with a U-shaped cross section. The opening edge of the annular space 13 is provided with a chamfer to facilitate smooth deformation during the product pressing process.

[0089] The inner platform 15 is provided with a protrusion 12 at the center for positioning the workpiece. The workpiece is provided with a hole at the center, and the protrusion 12 passes through the hole to limit the workpiece.

[0090] The outer dimensions of the wheel body are slightly smaller than the U-shaped cross-sectional shape of the finished annular cavity of the workpiece, that is, the cavity pressed out by the rolling wheel 3 is slightly smaller than the cavity shape of the final finished annular cavity, so that there is room for processing, which is convenient for further cavity surface treatment of the product after spinning.

[0091] Furthermore, it also includes a edging wheel 6, which is arranged outside the rolling wheel 3 and coaxially connected to the rolling wheel 3. Its wheel diameter is smaller than the rolling wheel 3, and the wheel surface cross-section of the edging wheel 6 is rectangular.

[0092] Furthermore, a wheel axle support 7 is provided to be in contact with the wheel axle, one end of the wheel axle support 7 is fixedly connected to the support beam 2, and the other end is connected to the edge rolling wheel 6 through the thrust bearing Ⅰ17 to ensure the stability of the edge rolling wheel 6. The rotating end of the thrust bearing Ⅰ17 is connected to the side of the edge rolling wheel 6 to ensure the stability of the edge rolling wheel 6. For example, the turbine in the hydraulic coupler only needs an annular cavity shape, while the pump wheel needs to connect the inner and outer flanges. Through the design of the edge rolling wheel 6, the annular cavity of the pump wheel and the outer flange can be integrally formed without the need for additional welding.

[0093] The frame 1 includes a gantry, a hydraulic cylinder mechanism or a lifting screw nut mechanism is fixedly arranged at the top of the gantry, the movable end of the hydraulic cylinder mechanism or the nut 21 is connected to the back side of the support beam 2, the hydraulic cylinder structure is preferably in this embodiment, two rolling wheels 3 are fixedly arranged on the front side of the support beam 2, and both ends of the support beam 2 are slidably connected to the gantry; the spinning die includes a cavity die 4 and a support seat 9, the cavity die 4 is fixedly connected to the support seat 9, the support seat 9 is provided with a sprocket Ⅰ, the support seat 9 is slidably and rotatably connected to the frame 1, and it is connected to the output end of the motor through a chain; the hydraulic cylinder mechanism is a hydraulic push rod Ⅰ8.

[0094] Furthermore, it also includes a base 10, which is fixedly connected to the gantry. The support seat 9 is connected to the base 10 through a bearing, and the support seat 9 can rotate under the drive of a chain.

[0095] Furthermore, the gantry comprises a top beam and two vertical beams, the hydraulic push rod I is fixed on the top beam and parallel to the vertical beams, vertical guide rails 14 are arranged on the inner sides of the two vertical beams, the two ends of the support beam 2 are slidably connected with the guide rails 14, and the support beam 2 is linearly displaced along the push rod direction by the guide rails 14; an X-shaped folding frame 11 is arranged between the support beam 2 and the top beam as a guide device to ensure that the displacement side does not rotate and is displaced along the central axis of the rotating side, and the X-shaped folding frame 11 comprises a frame rod hinged together in an X shape at the center, and the X The upper left end and the lower left end of the X-shaped folding frame 11 are hinged to the top beam and the supporting beam 2 respectively, and the upper right end and the lower right end of the X-shaped folding frame 11 are slidably connected to the plate with oblong holes through a pin shaft, and the plate with oblong holes is fixed to the lower right end of the top beam and the upper right end of the supporting beam 2 respectively; the vertical guide rail 14 includes two parallel convex ridge tracks fixed on the inner side of the vertical beam, and the two ends of the supporting beam 2 slide on the tracks; the end of the supporting beam 2 is also fixedly connected to a triangular support plate, the outer end face of the triangular support plate is flush with the end face of the supporting beam 2, and is slidably connected to the vertical guide rail 14.

[0096] Furthermore, the support seat 9 is connected to the base 10 through a deep groove ball bearing, and the lower end surface of the spun support seat 9 is connected to the upper end surface of the base 10 through a thrust bearing II.

[0097] A spinning method using the above-mentioned U-shaped cross-section annular cavity spinning device comprises the following steps:

[0098] (1) Heating the workpiece with a hole in the center

[0099] The workpiece is heated to make it have stronger ductility, and the heated workpiece is the blank.

[0100] Furthermore, the workpiece is heated to a red-hot state by an electric furnace. For example, the annular cavity blank for the hydraulic coupler in this case needs to be heated to 1000-1100 degrees Celsius.

[0101] (2) Spinning molding:

[0102] Perform annular cavity molding: fix the blank on the spinning die cavity mold 4, the rolling wheel 3 is used as the protruding part of the spinning punch, and the annular space 13 of the cavity mold 4 is used as the concave part of the spinning die. The spinning punch and the spinning die rotate relatively and gradually approach each other. The rolling wheel 3 moves toward the annular space 13, and the wheel surface of the rolling wheel 3 contacts and rotates with the workpiece. The spinning punch and the spinning die continue to approach each other, and the rolling wheel 3 extends into the annular space 13 to gradually roll out an annular cavity on the blank;

[0103] Step (2) also includes outer flange rolling: the rolling wheel 6 and the rolling wheel 3 act on the blank at the same time, pressing the blank outside the blank annular cavity to form the annular cavity and the outer flange;

[0104] Step (2) also includes forging the inner flange: after spinning, an auxiliary press plate is placed in the center of the blank, and the spinning punch is pressed against the press plate to forge the middle part of the blank annular cavity.

[0105] Subsequent steps also include slowly cooling the blank after shaping to remove stress.

[0106] Compared with the traditional forging method, which originally required a 3,000-ton press over 10 meters high for forging, the current structure height does not exceed 3 meters and only requires a hydraulic push rod with a force of 11 tons to achieve it.

[0107] Example 2. Compared with Example 1, the main difference of this example is that the spinning punch is a rotating party, rotating in place, and the spinning die is a displacement party, displacing toward the spinning punch. The rolling wheel 3, edge rolling wheel 6 structure and other main structures of the spinning punch are the same as those of Example 1.

[0108] The back side of the support beam 2 is fixedly connected with a rotating shaft 20, the top of the rotating shaft 20 is fixedly connected with a sprocket II 19, the sprocket II 19 is connected to the motor through a chain, and the rotating shaft 20 is connected to the frame 1 through a bearing seat. Furthermore, a thrust bearing III is arranged between the support beam 2 and the frame 1.

[0109] The spinning die support seat 9 does not rotate, and the bottom is connected to the frame 1 through a hydraulic cylinder mechanism. The movable end of the hydraulic cylinder mechanism is fixedly connected to the support seat 9, pushing the spinning die to move toward the spinning die direction. The workpiece is placed on the spinning die by the protrusion 12. The hydraulic cylinder mechanism is a hydraulic push rod II 18. There is no X-shaped folding frame and guide rail in this case.

[0110] Example 3. Figure 3As shown, compared with Example 1, the main difference of this embodiment is that the spinning punch is fixed, the spinning die is both the displacement and rotation party, and the displacement is toward the spinning punch. The rolling wheel 3, the edge rolling wheel 6 structure and other main structures of the spinning punch are the same as those of Example 1.

[0111] In this embodiment, the support beam 2 is directly fixedly connected to the frame 1, and the spinning punch part is fixed;

[0112] The lower end of the base 10 of the spinning die support seat 9 is connected to the frame 1 through a hydraulic cylinder mechanism, and the movable end of the hydraulic cylinder mechanism is fixedly connected to the base 10, pushing the spinning die to move toward the spinning die direction, and the cavity mold 4 is fixedly connected to the support seat 9. The support seat 9 is provided with a sprocket I. The support seat 9 is slidably and rotatably connected to the base 10, which is connected to the output end of the motor through a chain, and the motor is fixedly connected to the base 10; the hydraulic cylinder mechanism is a hydraulic push rod II 18, and there is no X-shaped folding frame in this case.

[0113] Example 4 Compared with Example 1, the main difference of this example is that the spinning die is both a rotating party and a displacing party, and both are displaced toward the middle; the rolling wheel 3, the edge rolling wheel 6 structure and other main structures of the spinning punch are the same as those of Example 1.

[0114] In this case, the base 10 below the spinning die is connected to the frame 1 through a hydraulic cylinder, and the motor that drives the support seat 9 to rotate is fixedly connected to the base 10.

[0115] Example 5. Compared with Example 2, the main difference of this example is that the spinning die is both a rotating party and a displacement party; the base 10 below the spinning die is connected to the frame 1 through a hydraulic cylinder, and the motor that drives the support seat 9 to rotate is fixedly connected to the base 10.

[0116] Example 6. Compared with Example 1, the main difference between this example and this example is that the spinning punch is both a displacement party and a rotation party, and the spinning die remains stationary; the driving device of the spinning punch is a lifting screw nut mechanism, which includes a sprocket III 24, a motor I, a spline sleeve 23, a screw, and a nut 21. The motor I is connected to the sprocket III 24 through a chain, the sprocket III 24 is fixedly connected to the spline sleeve 23, a spline groove is provided on the upper part of the screw, and a thread is provided on the middle and lower parts, the nut 21 is fixedly connected to the frame 1, the spline sleeve 23 is connected to the screw through a spline, the screw and the spline sleeve 23 are connected in an up and down sliding manner, the screw and the nut 21 are threadedly connected, and the lower end of the screw is fixedly connected to the spinning punch.

[0117] Furthermore, the motor I is fixedly connected to the frame 1, and the spline sleeve 23 is connected to the frame 1 through the bearing seat. In this case, there is no X-shaped folding frame and guide rail.

[0118] Embodiment 7. Compared with Embodiment 1, the main difference of this embodiment is that the spinning punch is both a displacement party and a rotation party; the driving device of the spinning punch is a lifting screw nut mechanism, which includes a sprocket III 24, a motor I, a spline sleeve 23, a screw, and a nut 21. The motor I is connected to the sprocket III 24 through a chain, the sprocket III 24 is fixedly connected to the spline sleeve 23, the upper part of the screw is provided with a spline groove, and the middle and lower parts are provided with a thread. The nut 21 is fixedly connected to the frame 1, the spline sleeve 23 is connected to the screw through a spline, the screw and the spline sleeve 23 are connected in an up and down sliding manner, the screw and the nut 21 are threadedly connected, and the lower end of the screw is fixedly connected to the spinning punch.

[0119] Furthermore, the motor I is fixedly connected to the frame 1, and the spline sleeve 23 is connected to the frame 1 through the bearing seat. In this case, there is no X-shaped folding frame and guide rail.

[0120] Embodiment 8. Compared with Embodiment 7, the main difference of this embodiment is that the spinning die is a displacement die, and both are displaced toward the middle; the membrane cavity of the spinning die is fixedly connected to the support seat 9 and the base 10, and the bottom of the base 10 is movably connected to the frame 1 through a hydraulic cylinder mechanism.

[0121] Example 9. Compared with Example 8, the main difference of this example is that the spinning die is both a displacement side and a rotation side, the membrane cavity of the spinning die is fixedly connected to the support seat 9, the support seat 9 is slidably and rotatably connected to the base 10, the support seat 9 is provided with a sprocket I connected to the motor transmission device and can rotate, and the bottom of the base 10 is movably connected to the frame 1 through a hydraulic cylinder mechanism.

[0122] In the above-mentioned embodiments 2-9, the whole device further comprises an auxiliary wheel 25, the auxiliary wheel 25 is fixedly connected to the support beam 2, the auxiliary wheel 25 and the rolling wheel 3 are arranged on the same annular track, the auxiliary wheel 25 is arranged between two adjacent rolling wheels 3, the auxiliary wheel 25 is arranged obliquely, and its wheel surface curve includes an arc, when the auxiliary wheel 25 and the rolling wheel 3 at the same horizontal rotation angle have vertical cross-sectional views through their wheel axes overlap, the wheel surface curve of the auxiliary wheel 25 is relatively convex outward, and intersects with a part of the side profile curve of the rolling wheel 3, and the curve formed by the convex wheel surface curve of the auxiliary wheel 25 and the wheel surface curve of part of the rolling wheel 3 is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spun;

[0123] The auxiliary wheel 25 includes a wheel body II 26, a wheel axle, and a wheel frame 27. The wheel body II 26 is rotatable and connected to the wheel frame 27 through the wheel axle. The wheel frame 27 is fixedly connected to the fixed frame 5 or the support beam of the rolling wheel 3.

[0124] Furthermore, the protruding wheel surface curve of the auxiliary wheel 25 and the wheel surface curve of the rolling wheel 3 have a natural transition at the intersection, that is, the protruding arc of the auxiliary wheel 25 and the wheel surface curve of the rolling wheel 3 form a continuous arc, and the two arcs are tangent at the intersection at the lower end.

[0125] In actual operation, the annular cavity can be rolled out by the rolling wheel 3 alone, but the side of the rolling wheel 3 will produce friction with the side of the cavity, especially the cavity surface on the outer side, affecting the surface quality of the cavity. Through the design of the auxiliary wheel 25, the side cavity is rolled out by the inclined auxiliary wheel 25, and the friction surface is effectively reduced, which helps to improve the surface quality of the cavity.

[0126] Furthermore, the positioning and calibration process is to place the rolling wheel 3 and the auxiliary wheel 25 of the support beam 2 in the annular cavity of the finished product, ensuring that the two rings are concentric, part of the wheel surface of the rolling wheel 3 fits with the cavity shape, and there is a gap between the outer part and the outside of the cavity shape. At this time, the wheel surface of the auxiliary wheel 25 is adjusted to fit with the outside of the cavity shape, and the lower end of the fitting surface with the cavity shape should be lower than the upper end of the fitting surface of the rolling wheel 3 on the same side and the cavity shape.

[0127] The upward displacement or downward displacement in this case is not limited to a simple displacement in the upper and lower spatial directions. The direction reference object is the upper and lower end directions of the workpiece. In the above embodiment, the rolling wheel 3 is not limited to two, for example Fig. 9 As shown, a schematic layout diagram of three rolling wheels 3, or even more, are arranged on a circular track, and the wheel axes of all rolling wheels 3 intersect, and the intersection point is on the rotation axis of the rotating party.

[0128] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention without paying creative labor.

Claims

1. A U-shaped cross-section annular cavity spinning device, characterized in that: The invention comprises a frame, a spinning punch and a spinning die. Both the spinning punch and the spinning die are connected to the frame. The spinning punch comprises a supporting beam and a rotatable rolling wheel arranged on the supporting beam. At least two rolling wheels are arranged evenly. The rolling wheel serves as the protruding part of the die of the spinning punch. The rolling wheel is arranged on an annular ring track. The spinning die is fixedly provided with a cavity die. The cavity die is provided with an open annular space. The opening of the annular space faces the spinning punch. The annular space serves as the recessed part of the die of the spinning die. The cavity die is used for fixing and supporting a workpiece. The spinning punch or the spinning die is connected to a driving device. The spinning punch and the spinning die rotate relatively and gradually approach each other. The rolling wheel moves toward the annular space. The wheel surface of the rolling wheel contacts and rotates with the workpiece. The spinning punch and the spinning die continue to approach each other. The rolling wheel extends into the annular space and gradually rolls out an annular cavity on the workpiece.

2. The U-shaped cross-section annular cavity spinning device according to claim 1, characterized in that: The rolling wheel is a rotatable wheel, including a wheel body and a wheel axle. The wheel body is connected to the wheel axle, and the wheel axle is fixedly connected to the support beam through a fixed frame. The outer shape formed by the wheel surface and shoulder of the wheel body, that is, the outer contour of the wheel body cross-section close to the wheel surface is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spin-formed; the cross-sectional arc of the wheel surface where the rolling wheel is displaced and extends into the annular space is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spin-formed.

3. The U-shaped cross-section annular cavity spinning device according to claim 1 or 2, characterized in that: It also includes an auxiliary wheel, which is fixedly connected to the support beam. The auxiliary wheel and the rolling wheel are arranged on the same annular ring track, the auxiliary wheel is arranged between two adjacent rolling wheels, the auxiliary wheel is inclined, and its wheel surface curve includes an arc. When the auxiliary wheel and the rolling wheel are at the same horizontal rotation angle, when the vertical cross-sectional views of the two passing through their wheel axes coincide, the wheel surface curve of the auxiliary wheel protrudes outwardly relative to the side of the rolling wheel curve and intersects with part of the side contour curve of the rolling wheel. The curve formed by the protruding wheel surface curve of the auxiliary wheel and the wheel surface curve of part of the rolling wheel is similar to the U-shaped cross-sectional shape of the annular cavity after the workpiece is spin-formed.

4. The U-shaped cross-section annular cavity spinning device according to claim 3, characterized in that: The auxiliary wheel comprises a wheel body II, a wheel axle and a wheel frame. The wheel body II is rotatable and connected to the wheel frame through the wheel axle. The wheel frame is fixedly connected to a fixed frame or a support beam of the rolling wheel.

5. The U-shaped cross-section annular cavity spinning device according to claim 1, characterized in that: The cavity mold includes an inner platform arranged in the center and an outer platform arranged outside the inner platform. There is an annular space between the inner platform and the outer platform. Both the inner platform and the outer platform are provided with a flat upper surface, which plays a supporting role. The annular space is an annular groove with a U-shaped cross-section or a ring with a rectangular or right-angled trapezoidal cross-section.

6. The U-shaped cross-section annular cavity spinning device according to claim 5, characterized in that: The annular space between the inner platform and the outer platform constitutes the recessed part of the spinning die, and the bottoms of the inner platform and the outer platform are integrally connected to form an annular groove with a U-shaped cross-section; or the inner platform has a cylindrical outer wall, and the outer platform is provided with an inner cylindrical groove, forming an annular groove between the inner platform and the outer platform.

7. The U-section annular cavity spinning device according to claim 3, characterized in that: It also includes an edge rolling wheel, which is arranged on the outside of the rolling wheel and is coaxially connected to the rolling wheel, and its wheel diameter is smaller than the rolling wheel.

8. The U-section annular cavity spinning device according to claim 7, characterized in that: A wheel axle support is also provided and is in contact with the wheel axle. One end of the wheel axle support is fixedly connected to the support beam, and the other end is connected to the edge rolling wheel through a thrust bearing I, so as to ensure the stability of the edge rolling wheel.

9. The U-shaped cross-section annular cavity spinning device according to claim 7, characterized in that: At least one of the spinning punch and the spinning die is a rotating die that rotates with its central axis; at least one of the spinning die is a displacement die that moves closer to the other die. The two die work together to spin the workpiece into a U-shaped cavity.

10. The U-section annular cavity spinning device according to claim 9, characterized in that: The action combination of the spinning punch and the spinning die is any one of the following combinations: ① The spinning punch is the displacement side, which moves toward the spinning die, and the spinning die is the rotation side, which rotates in place; ② The spinning punch is the rotating party, rotating in place, and the spinning die is the displacement party, displacing towards the spinning punch; ③ The spinning punch remains stationary, while the spinning die is both a rotating and displacement party; ④ The spinning punch is a displacement party, and the spinning die is both a rotation party and a displacement party, and both are displaced toward the middle; ⑤ The spinning punch is a rotating die in place, and the spinning die is a rotating die and a displacement die at the same time; ⑥ The spinning punch is both a displacement and a rotation party, and the spinning die remains stationary; ⑦ The spinning punch is both a displacement and a rotation party, while the spinning die is an in-situ rotation party; ⑧ The spinning punch is both a displacement and rotation party, and the spinning die is a displacement party, and both are displaced toward the middle; ⑨ The spinning punch is both a displacement and a rotation party, and the spinning die is both a displacement and a rotation party.

11. The U-shaped cross-section annular cavity spinning device according to claim 10, characterized in that: The driving device used as the displacement means in the above combinations ①, ②, and ④ is a lifting screw nut mechanism or a hydraulic cylinder mechanism. The screw in the lifting screw nut mechanism is connected to the motor for rotation, and the movable end of the nut or hydraulic cylinder mechanism is connected to the displacement means to linearly drive the displacement means to move. In the above combinations, the driving device for the rotating side in ①, ②, and ⑦ is a motor transmission mechanism, the motor output end of the motor transmission mechanism is connected to the rotating side through a chain, and the rotating side is fixedly provided with a sprocket connected to the chain; The driving device for both the rotation side and the displacement side in the above combinations ③-⑨ is composed of the above displacement side driving device and the rotation side driving device, that is, the displacement side driving device drives the rotation side and the rotation side driving device to move simultaneously; In the above combinations ⑥, ⑦, and ⑨, when the spinning punch is used as both the rotating party and the displacement party, the driving device includes a sprocket I, a motor I, a spline sleeve, a screw rod, and a nut. The motor I is connected to the sprocket I through a chain, the sprocket I is fixedly connected to the spline sleeve, the upper part of the screw rod is provided with a spline groove, the middle and lower parts are provided with a thread, the nut is fixedly connected to the frame, the spline sleeve is connected to the screw rod through a spline, the screw rod is connected to the spline sleeve for vertical sliding connection, the screw rod is threadedly connected to the nut, and the lower end of the screw rod is fixedly connected to the spinning punch.

12. The U-shaped cross-section annular cavity spinning device according to claim 9, characterized in that: The frame includes a gantry, and the driving device is a hydraulic cylinder mechanism or a lifting screw nut mechanism fixedly arranged on the top of the gantry. The movable end of the hydraulic cylinder mechanism or the nut is connected to the back side of the support beam, and two rolling wheels are fixedly arranged on the front side of the support beam. Both ends of the support beam are slidably connected to the gantry; the spinning die includes a cavity die and a support seat, the cavity die is fixedly connected to the support seat, the support seat is provided with a sprocket, the support seat is slidably and rotatably connected to the frame, and it is connected to the output end of the motor through a chain.

13. The U-shaped cross-section annular cavity spinning device according to claim 12, characterized in that: It also includes a base, which is fixedly connected to the gantry. The support seat is connected to the base through a bearing, and the support seat can rotate under the drive of a chain.

14. The U-shaped cross-section annular cavity spinning device according to claim 12, characterized in that: The gantry comprises a top beam and two vertical beams, a hydraulic push rod is fixed on the top beam and is parallel to the vertical beams, vertical guide rails are arranged on the inner sides of the two vertical beams, two ends of the support beam are slidably connected to the guide rails, and the support beam is linearly displaced in the direction of the push rod through the guide rail limiter; an X-shaped folding frame is arranged between the support beam and the top beam as a guide device to ensure that the displacement party does not rotate and is displaced along the central axis of the rotating party; the X-shaped folding frame comprises a frame rod hinged together in an X shape at the center, the upper left end and the lower left end of the X-shaped folding frame are respectively hinged to the top beam and the support beam, the upper right end and the lower right end of the X-shaped folding frame are slidably connected to a plate with an oblong hole through a pin shaft, and the plate with the oblong hole is respectively fixed to the lower right end of the top beam and the upper right end of the support beam; the vertical guide rail comprises two convex ridge tracks fixed on the inner sides of the vertical beams in parallel, and the two ends of the support beam slide on the tracks; a triangular support plate is also fixedly connected to the end of the support beam, the outer end surface of the triangular support plate is flush with the end surface of the support beam, and is slidably connected to the vertical guide rail.

15. The U-shaped cross-section annular cavity spinning device according to claim 5, characterized in that: A protrusion is arranged at the center of the inner platform for positioning the workpiece, a hole is arranged at the center of the workpiece, and the protrusion passes through the hole to limit the workpiece.

16. A spinning method using the U-section annular cavity spinning device according to any one of claims 7 to 14, characterized in that: It includes the following steps: (1) Heating the workpiece with a hole in the center The workpiece is heated to make it have stronger ductility, and the heated workpiece is the blank; (2) Spinning molding: To perform annular cavity molding: fix the blank on the spinning die cavity mold, the rolling wheel serves as the protruding part of the spinning punch, and the annular space of the cavity mold serves as the recessed part of the spinning die. The spinning punch and the spinning die rotate relative to each other and gradually approach each other. The rolling wheel moves toward the annular space, and the wheel surface of the rolling wheel contacts and rotates with the workpiece. The spinning punch and the spinning die continue to approach each other, and the rolling wheel extends into the annular space to gradually roll out an annular cavity on the blank.

17. The spinning method according to claim 16, characterized in that: Step (2) also includes outer flange rolling: the rolling wheel and the rolling wheel act on the blank at the same time, pressing the blank outside the blank annular cavity to form the annular cavity and the outer flange.

18. The spinning method according to claim 16, characterized in that: Step (2) also includes forging the inner flange: after spinning, an auxiliary press plate is placed in the center of the blank, and the spinning punch is pressed against the press plate to forge the middle part of the blank annular cavity.

19. The spinning method according to claim 16, characterized in that: In step (2), the rolling wheel and the auxiliary wheel together constitute the protruding part of the mold of the spinning punch. The rolling wheel and the auxiliary wheel are displaced toward the annular space together. The wheel surface of the rolling wheel first contacts and rotates with the workpiece, and the spinning punch and the spinning die continue to approach. The auxiliary wheel begins to contact and rotate with the workpiece, and the rolling wheel and the auxiliary wheel continue to extend into the annular space, gradually rolling out an annular cavity on the blank. The auxiliary wheel is used to roll out the cavity shape on the side of the annular cavity.

20. The spinning method according to claim 16, characterized in that: This method is used for U-shaped head modeling.

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