A direct rolling forming die for flange on ring rolling machine and use method thereof

Abstract

The present invention belongs to the technical field of non-cutting processing of metal plates, and in particular to a direct rolling forming die for a flange on a ring rolling machine and a method of using the same. The direct rolling forming die for a flange on a ring rolling machine comprises a base, a vertical plate is fixed to one side of the top of the base, a rotating shaft is rotatably penetrated in the vertical plate, a first motor is fixed to the side of the vertical plate away from the base through a frame, an output shaft of the first motor is fixedly connected to one end of the rotating shaft, a model ring is detachably fixedly sleeved on the outer wall of the rotating shaft, and the corresponding model ring can be replaced according to rolling needs. In the present invention, during the rolling process of the ring blank, the core mold can be easily replaced as needed to achieve the purpose of rolling the inside of the ring blank, and then when the ring blank is placed on the model ring and the core shaft, the ring blank can be directly rolled into shape, thereby greatly improving the rolling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of non-cutting processing of metal plates, and in particular to a direct rolling forming die for a flange on a ring rolling machine and a use method thereof. Background Art

[0002] A flange is a disc-shaped part, which is mainly used to connect pipes. It is widely used in the fields of petrochemical industry, urban water supply system, electric power industry, etc. The existing technology still has the following shortcomings in the flange rolling forming process: In the existing technology, a mandrel and a model are required to cooperate to complete the rolling operation during the rolling process. However, since the inner wall of the flange is circular during the flange rolling process, when steps or grooves need to be formed on the inner wall of the flange, subsequent processing is required, and the flange processing cannot be completed in one go, thereby reducing the production efficiency of the flange.

[0003] In view of the above problems, the present invention document proposes a direct rolling forming die for a flange on a ring rolling machine and a method for using the die. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing flange processing cannot be completed in one go, resulting in low flange production efficiency, and to propose a direct rolling forming die for the flange on a ring rolling machine and a method of use.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A direct rolling forming die for a flange on a ring rolling machine comprises a base, a vertical plate is fixed on one side of the top of the base, a rotating shaft is rotatably penetrated in the vertical plate, a first motor is fixed on the side of the vertical plate away from the base through a frame, an output shaft of the first motor is fixedly connected to one end of the rotating shaft, a model ring is detachably fixedly sleeved on the outer wall of the rotating shaft, and the corresponding model ring can be replaced according to rolling needs;

[0007] It also includes a mandrel, which rotates on one side of the vertical plate and is located above the rotating shaft. The model ring cooperates with the mandrel to roll the annular blank. The outer wall of the mandrel is sleeved with a mandrel mold, and the mandrel mold, the mandrel and the model ring cooperate to roll the inner wall of the annular blank.

[0008] It also includes two guide wheels, and the two guide wheels are both located above the mandrel, and the two guide wheels are located on both sides of the annular blank, and are used to control the thickness of the annular blank;

[0009] It also includes a moving seat, which slides on the top of the base, a rotating tube is rotated through the moving seat, a hollow disk is provided on the side of the moving seat close to the vertical plate, one end of the rotating tube is fixedly extended into the hollow disk, a hydraulic cylinder is fixed on the top of the base, and the output shaft of the hydraulic cylinder is fixedly connected to the side of the moving seat away from the vertical plate;

[0010] A fixing structure, arranged at one end of the mandrel, for fixing the core mold on the outer wall of the mandrel;

[0011] A control structure is arranged in the vertical plate and is used to make the guide wheel always contact with the annular blank;

[0012] The replacement structure is arranged on one side of the moving seat and is used for replacing the core mold of the outer wall of the core shaft.

[0013] In one possible design, the fixed structure includes a plug-in block fixed to one end of the core shaft near the hollow disk, a connecting disk is fixed to one end of the core mold near the hollow disk, the outer wall of the core shaft is provided with a plurality of slide grooves, and the inner wall of the connecting disk is fixed with a plurality of sliders, the connecting disk is slidably connected to the core shaft through the slide grooves and the sliders, the core shaft drives the core mold and the connecting disk to rotate through the slide grooves and the sliders, and the side of the connecting disk away from the core mold is rotatably connected with a connector, one end of the plug-in block passes through the connector, and sliding grooves are provided at the top and bottom of the plug-in block, a first spring is fixed to the inner wall on one side where the two sliding grooves are close to each other, a trapezoidal block is fixed to one end of the two first springs away from each other, and the two trapezoidal blocks are slidably arranged in the corresponding sliding grooves, the trapezoidal block is used to limit the connector, and the trapezoidal block, the connector and the slide groove are used to limit the connector. , and the slider cooperate to fix the core mold on the outer wall of the core shaft; the moving seat moves in the direction of the core shaft, and the core shaft passes through the core mold, the connecting disk and the connecting head in sequence until the plug-in block is inserted into the extrusion cylinder and one end of the connecting head contacts the extrusion cylinder. Then the moving seat and the extrusion cylinder move outward, and the connecting head is detached from the mounting cylinder. After the trapezoidal clamp loses the extrusion of the extrusion cylinder, it extends outward under the elastic force of the first spring, and the trapezoidal clamp is just stuck at one end of the connecting head, and the slider in the connecting disk cooperates with the slide groove on the outer wall of the core shaft, and the slider in the connecting disk contacts with the inner wall of one side of the slide groove on the outer wall of the core shaft. At this time, the trapezoidal clamp, the slider and the slide groove cooperate to fix the core mold on the outer wall of the core shaft. In the later process of the core shaft rotating to roll the annular blank, the core mold is synchronously driven to rotate to roll the inner wall of the annular blank.

[0014] In a possible design, the control structure includes a lifting plate sliding on one side of the vertical plate, the lifting plate is located directly above the core shaft, a strip groove is provided at the bottom of the lifting plate, a bidirectional screw rod is rotatably connected in the strip groove, one end of the bidirectional screw rod is rotatably extended to one side of the lifting plate, two nut blocks are slidably connected in the strip groove, the two nut blocks are respectively threadedly connected to the positive and negative thread segments of the bidirectional screw rod, two guide wheels are respectively rotated at the bottom of the two nut blocks, the rotation of the bidirectional screw rod controls the spacing between the two guide wheels, a lifting groove is provided in the vertical plate, a lifting block is slidably connected in the lifting groove, a cylinder is fixed to the top inner wall of the lifting groove, and the output shaft of the cylinder is connected to the The top of the lifting block is fixedly connected, a connecting block is fixed on one side of the top of the lifting block, a pull rope is fixed on the top of the connecting block, the top of the vertical plate is rotatably connected to a guide wheel, one end of the pull rope is wrapped around the outer wall of the guide wheel and fixedly connected to the top of the lifting plate, and the lifting of the lifting block is used to control the lifting of the lifting plate; when the lifting block moves downward, the connecting block pulls the lifting plate upward through the pull rope, so that the two guide wheels can squeeze the two sides of the annular blank to control the thickness of the annular blank, and when it is necessary to roll annular blanks of different thicknesses, the spacing between the two guide wheels can be controlled by rotating the bidirectional screw to meet the rolling requirements of different annular blanks.

[0015] In a possible design, the replacement structure includes an air pump fixed to a side of the moving seat away from the vertical plate, a connecting pipe is fixed to the air inlet of the air pump, one end of the connecting pipe extends into the rotating tube and is rotatably connected to the rotating tube, a second gear is fixedly sleeved on the outer wall of the rotating tube, a third motor is fixed to a side of the moving seat away from the vertical plate through a frame, a first gear meshing with the second gear is fixed to the output shaft of the third motor, the third motor drives the hollow disk to rotate through the first gear and the second gear, a plurality of mounting cylinders are fixed to a side of the hollow disk close to the vertical plate, a connecting head seals and slides into the mounting cylinder, an extrusion cylinder is fixed to the inner wall of a side of the plurality of mounting cylinders close to the hollow disk, a plug-in block slides and extends into the extrusion cylinder, and is used to extrude the trapezoidal card block into the sliding groove, the extrusion cylinder conflicts with one end of the connecting head, and a plurality of The outer walls of the mounting tubes are all fixedly connected with connecting tubes, and the other ends of the multiple connecting tubes are all connected with the hollow disk. The suction pump controls the negative pressure in the corresponding mounting tube to adsorb the connector in the mounting tube. The sides of the multiple mounting tubes close to each other are all fixedly connected with air guide tubes to balance the pressure in the mounting tube. The outer walls of the connecting tubes and the air guide tubes are provided with solenoid valves. When the connector seal on one side of the core mold to be replaced extends into the mounting tube, one end of the connector contacts the extrusion tube, and the plug-in block extends into the extrusion tube simultaneously. The extrusion tube squeezes the trapezoidal block into the sliding groove to release the limit of the sliding groove on the connector. Then the suction pump sucks air into the corresponding mounting tube through the connecting tube. The negative pressure inside the mounting tube adsorbs the connector. When the moving seat moves outward, the core mold, the connecting disk and the connector are taken out of the core shaft.

[0016] In one possible design, one end of the mandrel away from the moving seat rotates and passes through the lifting block. A second motor is fixed to the side of the lifting block away from the moving seat through a frame. The output shaft of the second motor is fixedly connected to one end of the mandrel through a coupling, so as to control the cooperation between the mandrel and the model ring to roll the annular blank.

[0017] In a possible design, two vertical grooves are provided on one side of the vertical plate close to the moving seat, and fixed rods are longitudinally fixed in the two vertical grooves. The outer walls of the two fixed rods are slidably sleeved with mounting blocks, and the outer walls of the two fixed rods are sleeved with second springs fixedly connected to the bottom of the mounting blocks. The bottom ends of the two second springs are respectively fixedly connected to the bottom inner walls of the corresponding vertical grooves. The two mounting blocks are rotatably connected to a rotating shaft on one side close to the moving seat, and the two rotating shafts cooperate with the model ring to limit and support the annular blank.

[0018] In a possible design, two support plates are slidably connected to one side of the vertical plate close to the movable seat, and ends of the two rotating shafts away from the mounting block are respectively rotatably connected to corresponding support plates, and the support plates are used to support the rotating shafts.

[0019] In one possible design, a coolant pipe located above the core shaft is fixed to one side of the vertical plate, and the coolant pipe is connected to an external water pump through a hose for spraying coolant on the core shaft. A collecting box located below the rotating shaft is detachably fixed to one side of the vertical plate close to the movable seat for collecting coolant. A drain pipe is fixedly passed through the bottom inner wall of the collecting box for recycling the coolant. An end of the rotating shaft away from the first motor rotates in cooperation with an inner wall of one side of the collecting box for supporting the rotating shaft.

[0020] In one possible design, a circular groove is provided on the bottom inner wall of the lifting groove, a third spring is fixed on the bottom inner wall of the circular groove, a lifting rod fixedly connected to the top of the third spring is slidably connected in the circular groove, a pressure sensor is fixed on the top of the lifting rod, and the pressure sensor cooperates with the lifting block to test the height of the core shaft so that the core shaft and the axis center line of the uppermost mounting cylinder are at the same height; when the lifting block descends to a certain height, an extrusion pressure is generated on the pressure sensor, and at this time the core shaft and the uppermost mounting cylinder are at the same height, and then the lifting block and the core shaft continue to move down a certain distance, and the annular blank is rolled again to provide space for installing the core mold, and then the core shaft moves up to a position at the same height as the mounting cylinder to facilitate the subsequent installation of the core mold.

[0021] In the present application, a method for using a direct rolling forming die for a flange on a ring rolling machine comprises the following steps:

[0022] S1. Place the annular blank on the model ring, with the mandrel passing through it, and limited by the rotating shaft and the second spring; during rolling, the mandrel is driven to rotate by the second motor, the cylinder pushes the lifting block downward, and the first motor drives the model ring to rotate, so as to realize the rolling of the blank; the coolant pipe sprays coolant through the water pump to cool the mandrel, and the coolant is recovered by the collection box and the drain pipe;

[0023] S2. When the lifting block moves downward, the connecting block pulls the lifting plate through the pull rope, so that the guide wheel squeezes the billet to control the thickness; the bidirectional screw can adjust the guide wheel spacing to meet the rolling requirements of different billets;

[0024] S3. When the inner wall of the billet needs to be rolled, the core mold is installed; when the lifting block descends to a certain height, the core shaft is aligned with the installation cylinder, and continues to move down to provide space for installing the core mold, and then moves up to prepare for installing the core mold;

[0025] S4. Install the core mold according to the needs. The third motor drives the hollow disk to rotate through the first gear and the second gear. The movable seat is pushed by the hydraulic cylinder to match the core mold, the connecting disk and the connecting head with the core shaft. After the core shaft is penetrated, the movable seat and the extrusion cylinder move outward. The trapezoidal clamping block clamps the connecting head under the action of the first spring. The slider cooperates with the core shaft slide groove to fix the core mold.

[0026] S5. When replacing the core mold, the hydraulic cylinder pushes the moving seat, and the connecting head is inserted into the installation tube. As the moving seat continues to push, the connecting head and the installation tube are sealed and matched; the solenoid valve is opened to exhaust the air, and the extrusion tube pushes the trapezoidal block into the sliding groove to release the jam; the suction pump generates suction through the connecting pipe and the connecting pipe to form a negative pressure to absorb the replaced core mold, and the moving seat moves out to take out the core mold, and then repeats step S4 to complete the replacement, thereby realizing the rolling of the inner wall of the billet.

[0027] Compared with the prior art, the present invention has the following beneficial effects: in the present invention, a plug-in block is fixed at one end of the mandrel, a connecting disk is fixed at one end of the mandrel mold, the connecting disk is slidably connected to the mandrel through a slide groove and a slider, a connecting head is rotatably connected to a side of the connecting disk away from the mandrel mold, one end of the plug-in block passes through the connecting head, a sliding groove is provided at the top and the bottom of the plug-in block, and a trapezoidal clamping block is fixed at one end of the two first springs away from each other; the mandrel passes through the mandrel mold, the connecting disk and the connecting head in sequence, the trapezoidal clamping block extends outward under the elastic force of the first spring, and the trapezoidal clamping block is just clamped at one end of the connecting head, and the slider in the connecting disk cooperates with the slide groove of the outer wall of the mandrel, and the slider in the connecting disk conflicts with the inner wall of one side of the slide groove of the outer wall of the mandrel, at this time, the trapezoidal clamping block, the slider and the slide groove cooperate to fix the mandrel mold to the outer wall of the mandrel, which is convenient for rolling the inner wall of the annular blank in the later stage;

[0028] In the present invention, the replacement structure includes an air suction pump fixed on the side of the moving seat away from the vertical plate, the air suction pump is rotatably connected with the rotating tube through a connecting pipe, a plurality of mounting cylinders are fixed on the side of the hollow disk close to the vertical plate, and an extrusion cylinder is fixed on the inner wall of the side of the plurality of mounting cylinders close to the hollow disk, and the outer walls of the plurality of mounting cylinders are connected with the hollow disk through a connecting pipe; when the connector seal on one side of the core mold extends into the mounting cylinder, one end of the connector abuts against the extrusion cylinder, and the plug-in block extends into the extrusion cylinder synchronously, and the extrusion cylinder squeezes the trapezoidal block into the sliding groove, releasing the limit of the sliding groove on the connector, and then the air suction pump sucks air into the corresponding mounting cylinder through the connecting pipe, and the negative pressure inside the mounting cylinder adsorbs the connector, and when the moving seat moves outward, the core mold, the connecting disk and the connector are taken out from the core shaft;

[0029] In the present invention, a circular groove is provided on the bottom inner wall of the lifting groove, a third spring is fixed on the bottom inner wall of the circular groove, a lifting rod fixedly connected to the top of the third spring is slidably connected in the circular groove, and a pressure sensor is fixed on the top of the lifting rod; when the lifting block descends to a certain height, an extrusion force is generated on the pressure sensor, at which time the mandrel and the topmost installation cylinder are at the same height, then the lifting block and the mandrel continue to move down a certain distance, and the annular blank is rolled again to provide space for installing the core mold, and then the mandrel moves up to a position at the same height as the installation cylinder, which is convenient for the subsequent installation of the core mold;

[0030] In the present invention, during the rolling process of the ring-shaped blank, the core mold can be easily replaced as needed to achieve the purpose of rolling the inside of the ring-shaped blank. Furthermore, when the ring-shaped blank is placed on the model ring and the core shaft, the ring-shaped blank can be directly rolled into shape, greatly improving the rolling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the three-dimensional structure of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0032] Figure 2 A schematic diagram of a three-dimensional cross-sectional structure of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0033] Figure 3 A schematic diagram of a three-dimensional cross-sectional structure of a hollow disk and a movable seat of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0034] Figure 4 A schematic diagram of a three-dimensional exploded cross-sectional structure of a hollow disk of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0035] Figure 5A schematic diagram of a three-dimensional exploded structure of a vertical plate, a collecting box and a model ring of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0036] Figure 6 A schematic diagram of a three-dimensional cross-sectional structure of a core mold, a core shaft and a connector of a direct rolling forming mold for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0037] Figure 7 A schematic diagram of a three-dimensional cross-sectional structure of a core mold, a connector and a connecting plate of a direct rolling forming mold for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0038] Figure 8 A schematic cross-sectional structural diagram of the cooperation between a plug-in block and an extrusion cylinder of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0039] Fig. 9 A schematic diagram of a three-dimensional cross-sectional structure of a lifting plate of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0040] Fig.10 A schematic diagram of the three-dimensional structure of a mounting block and a rotating shaft of a direct rolling forming die for a flange on a ring rolling machine provided in Example 1 of the present invention;

[0041] Fig.11 for Figure 4 The enlarged structural diagram at A in the middle;

[0042] Fig.12 for Figure 7 The enlarged structural diagram at B in the middle;

[0043] Fig.13 A schematic diagram of a partial three-dimensional cross-sectional structure of a vertical plate of a direct rolling forming die for a flange on a ring rolling machine provided in Example 2 of the present invention;

[0044] Fig.14 for Fig.13 Enlarged structural diagram at point C in the middle.

[0045] In the figure: 1, base; 2, vertical plate; 3, annular blank; 4, rotating shaft; 5, first motor; 6, model ring; 7, lifting groove; 8, cylinder; 9, lifting block; 10, mandrel; 11, second motor; 12, plug-in block; 13, core mold; 14, connecting plate; 15, connector; 16, sliding groove; 17, first spring; 18, trapezoidal block; 19, moving seat; 20, hydraulic cylinder; 21, rotating tube; 22, hollow disk; 23, suction pump; 24, connecting pipe; 25, third motor; 26, first gear; 27. Second gear; 28. Mounting cylinder; 29. ​​Extrusion cylinder; 30. Air guide tube; 31. Connecting tube; 32. Lifting plate; 33. Nut block; 34. Bidirectional screw rod; 35. Guide wheel; 36. Guide wheel; 37. Pull rope; 38. Connecting block; 39. Vertical groove; 40. Mounting block; 41. Fixing rod; 42. Second spring; 43. Rotating shaft; 44. Support plate; 45. Collecting box; 46. Drain pipe; 47. Circular groove; 48. Lifting rod; 49. Third spring; 50. Pressure sensor; 51. Coolant pipe. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0047] Example 1: Reference Figure 1 , Figure 2 and Figure 5 , a rolling forming die, which is used in the field of mine parts processing, includes a base 1, and a vertical plate 2 is fixed to one side of the top of the base 1. A rotating shaft 4 is rotatably penetrated in the vertical plate 2, and a model ring 6 is detachably fixedly sleeved on the outer wall of the rotating shaft 4, which is used to replace the corresponding model ring 6 according to rolling needs. A first motor 5 is fixed to the side of the vertical plate 2 away from the base 1 through a frame, and the output shaft of the first motor 5 is fixedly connected to one end of the rotating shaft 4 to drive the rotating shaft 4 and the model ring 6 to rotate.

[0048] Reference Figure 2 , Figure 5 and Figure 6 In addition, the mold further includes a mandrel 10, which rotates on one side of the vertical plate 2 and is located above the rotating shaft 4. The model ring 6 cooperates with the mandrel 10 to roll the annular blank 3. The outer wall of the mandrel 10 is sleeved with a core mold 13, and the core mold 13, the mandrel 10 and the model ring 6 cooperate to roll the inner wall of the annular blank 3.

[0049] Reference Figure 1 and Figure 2 In order to control the thickness of the annular blank 3 , the mold further includes two guide wheels 35 . Both guide wheels 35 are located above the core shaft 10 and on both sides of the annular blank 3 .

[0050] Reference Figure 1-Figure 3 The mold further includes a moving seat 19, which slides on the top of the base 1. A rotating tube 21 rotates through the moving seat 19, and a hollow disk 22 is provided on the side of the moving seat 19 close to the vertical plate 2. One end of the rotating tube 21 is fixedly extended into the hollow disk 22. A hydraulic cylinder 20 is fixed on the top of the base 1, and the output shaft of the hydraulic cylinder 20 is fixedly connected to the side of the moving seat 19 away from the vertical plate 2, which is used to drive the moving seat 19 to slide on the base 1.

[0051] Reference Figure 6 and Figure 7 , Fig.12 , the fixing structure is used to fix the core mold 13 to the outer wall of the core shaft 10. Specifically, the fixing structure includes a plug-in block 12 fixed to one end of the core shaft 10 close to the hollow disk 22. A connecting disk 14 is fixed to the end of the core mold 13 close to the hollow disk 22, and a plurality of slide grooves are provided on the outer wall of the core shaft 10. A plurality of sliders are fixed to the inner wall of the connecting disk 14, and the connecting disk 14 is slidably connected to the core shaft 10 through the slide grooves and the sliders. A connector 15 is rotatably connected to the side of the connecting disk 14 away from the core mold 13, and one end of the plug-in block 12 passes through the connector 15. Sliding grooves 16 are provided on the top and bottom of the plug-in block 12, and a first spring 17 is fixed to the inner wall on the side where the two sliding grooves 16 are close to each other, and a trapezoidal block 18 is fixed to the end where the two first springs 17 are away from each other. The trapezoidal block 18 is slidably set in the corresponding sliding groove 16 to limit the connector 15. The core mold 13 is fixed to the outer wall of the core shaft 10 through the cooperation of the trapezoidal clamping block 18, the connecting head 15, the sliding groove and the sliding block.

[0052] Specifically, the hydraulic cylinder 20 drives the movable seat 19 to move in the direction of the core shaft 10, and the core shaft 10 passes through the core mold 13, the connecting disk 14 and the connecting head 15 in sequence, until the plug-in block 12 is inserted into the extrusion cylinder 29, and one end of the connecting head 15 abuts against the extrusion cylinder 29. Then, the movable seat 19 and the extrusion cylinder 29 move outward, and the connecting head 15 is disengaged from the mounting cylinder 28. After losing the extrusion of the extrusion cylinder 29, the trapezoidal clamping block 18 extends outward under the elastic force of the first spring 17 and is stuck at one end of the connecting head 15. The slider in the connecting disk 14 cooperates with the slide groove on the outer wall of the core shaft 10 to fix the core mold 13 on the outer wall of the core shaft 10. In the later process of the core shaft 10 rotating to roll the annular blank 3, the core mold 13 is synchronously driven to rotate to roll the inner wall of the annular blank 3.

[0053] Reference Figure 2 , Figure 5 , Figure 6 and Fig. 9, the control structure is used to make the guide wheel 35 always touch the ring blank 3. Specifically, the control structure includes a lifting plate 32 sliding on one side of the vertical plate 2, and the lifting plate 32 is located directly above the core shaft 10. A strip groove is provided at the bottom of the lifting plate 32, and a bidirectional screw rod 34 is rotatably connected in the strip groove, and one end of the bidirectional screw rod 34 is rotatably extended to one side of the lifting plate 32. Two nut blocks 33 are slidably connected in the strip groove, and the two nut blocks 33 are respectively threaded on the positive and negative thread segments of the bidirectional screw rod 34. The two guide wheels 35 are respectively rotated at the bottom of the two nut blocks 33, and the rotation of the bidirectional screw rod 34 can control the spacing between the two guide wheels 35. A lifting groove 7 is provided in the vertical plate 2, and a lifting block 9 is slidably connected in the lifting groove 7. A cylinder 8 is fixed to the inner wall of the top of the lifting groove 7, and the output shaft of the cylinder 8 is fixedly connected to the top of the lifting block 9. A connecting block 38 is fixed to one side of the top of the lifting block 9, and a pull rope 37 is fixed to the top of the connecting block 38. The top of the vertical plate 2 is rotatably connected to a guide wheel 36, and one end of a pull rope 37 is wound around the outer wall of the guide wheel 36 and fixedly connected to the top of the lifting plate 32. The lifting of the lifting block 9 can control the lifting of the lifting plate 32, thereby controlling the contact between the guide wheel 35 and the annular blank 3.

[0054] When in use, the annular blank 3 is first placed between the model ring 6 and the core mold 13. Then, the first motor 5 is started to drive the rotating shaft 4 and the model ring 6 to rotate. At the same time, the cylinder 8 is started to drive the lifting block 9 to move downward, and the connecting block 38 pulls the lifting plate 32 upward through the pull rope 37, so that the two guide wheels 35 squeeze the two sides of the annular blank 3 to control the thickness of the annular blank 3. As needed, the spacing between the two guide wheels 35 can be adjusted by rotating the bidirectional screw 34 to meet the requirements of rolling different annular blanks 3.

[0055] Reference Figure 2 and Figure 3 , the replacement structure is arranged on one side of the moving seat 19, and is used to replace the core mold 13 of the outer wall of the core shaft 10. On the side of the moving seat 19 away from the vertical plate 2, we fixedly installed an air pump 23. On the air inlet of the air pump 23, we connected a connecting pipe 24. One end of this connecting pipe 24 is cleverly designed to extend into the interior of the rotating tube 21, and form a rotating connection with the rotating tube 21, thereby ensuring that the connecting pipe 24 can still stably transport airflow when the rotating tube 21 rotates. On the outer wall of the rotating tube 21, we fixedly sleeved a second gear 27. On the other side of the moving seat 19 away from the vertical plate 2, we fixedly installed a third motor 25 through a frame. On the output shaft of the third motor 25, we fixed a first gear 26 meshing with the second gear 27. In this way, when the third motor 25 is started, it can drive the hollow disk 22 to rotate through the meshing relationship between the first gear 26 and the second gear 27.

[0056] Reference Figure 3 and Figure 4 , Fig.11 , we have fixedly installed a plurality of mounting cylinders 28 on one side of the hollow disk 22 close to the vertical plate 2. These mounting cylinders 28 are designed to accommodate and fix the connector 15. When the connector 15 extends into the interior of the mounting cylinder 28 in a sealed and sliding manner, it forms a tight seal with the inner wall of the mounting cylinder 28. On the inner wall of each mounting cylinder 28 close to the hollow disk 22, we have fixedly installed an extrusion cylinder 29. When the plug-in block 12 slides and extends into the extrusion cylinder 29, it squeezes the trapezoidal block 18 into the sliding groove 16, thereby releasing the limit of the sliding groove 16 on the connector 15.

[0057] Reference Figure 3 and Figure 4 , Fig.11 In order to control the pressure inside the installation cylinder 28, we fixedly connected a connecting pipe 31 on the outer wall of each installation cylinder 28, and the other end of these connecting pipes 31 is connected to the hollow disk 22. At the same time, we also fixedly connected an air guide pipe 30 to each installation cylinder 28. These air guide pipes 30 are designed to form a pressure balance inside the installation cylinder 28 to prevent sealing failure caused by pressure difference. Solenoid valves are set on the outer walls of the connecting pipe 31 and the air guide pipe 30 to accurately control the on and off of the airflow.

[0058] When the core mold 13 needs to be replaced, we will first extend the connector 15 on one side of the core mold 13 to be replaced into the corresponding installation tube 28 in a sealed manner. At this time, one end of the connector 15 will contact the extrusion tube 29, and the plug-in block 12 will also extend into the extrusion tube 29 synchronously, squeezing the trapezoidal block 18 into the sliding groove 16, thereby releasing the limit on the connector 15. Next, we start the suction pump 23, and suck air into the corresponding installation tube 28 through the connecting pipe 31 to form a negative pressure. This negative pressure will firmly adsorb the connector 15 in the installation tube 28. Then, we move the movable seat 19 outward, and the core mold 13, the connecting plate 14 and the connector 15 can be taken out of the core shaft 10 together to complete the replacement operation.

[0059] Reference Figure 2 , Figure 5 and Figure 6 In addition, the design of the mandrel 10 is also quite ingenious. One end of it is away from the moving seat 19, and rotates to penetrate the lifting block 9. On the side of the lifting block 9 away from the moving seat 19, we fixedly installed a second motor 11 through the frame. The output shaft of the second motor 11 is fixedly connected to one end of the mandrel 10 through a coupling. In this way, when the second motor 11 is started, it can control the mandrel 10 to rotate and cooperate with the model ring 6 to roll the annular blank 3.

[0060] Reference Figure 5 and Fig.10 Finally, in order to limit and support the annular blank 3, we set two vertical grooves 39 on the side of the vertical plate 2 close to the moving seat 19. A fixing rod 41 is fixed longitudinally in each of the two vertical grooves 39. A mounting block 40 is slidably sleeved on the outer wall of the fixing rod 41, and is connected to the bottom inner wall of the vertical groove 39 through a second spring 42. In this way, the mounting block 40 can move up and down under the elastic force of the second spring 42. On the side of each mounting block 40 close to the moving seat 19, we have rotatably connected a rotating shaft 43. The two rotating shafts 43 cooperate with the model ring 6 to limit and support the annular blank 3 and ensure its stability during the rolling process.

[0061] Reference Figure 5 and Fig.10 Two support plates 44 are designed on the side of the vertical plate 2 close to the moving seat 19. The two support plates 44 are slidably connected to the vertical plate 2, ensuring that the support plates 44 can be moved and adjusted along the vertical plate 2. At the same time, the ends of the two rotating shafts 43 away from the mounting block 40 are respectively rotatably connected to the corresponding support plates 44, so that the support plates 44 provide a stable support for the rotating shafts 43, ensuring the stability of the rotating shafts 43 during rotation.

[0062] Reference Figure 2 Furthermore, in order to optimize the cooling effect of the mold, we fixed a coolant pipe 51 on one side of the vertical plate 2. The coolant pipe 51 is located above the core shaft 10 and is connected to an external water pump through a hose. In this way, the coolant pipe 51 can spray coolant on the core shaft 10, effectively reducing the temperature of the core shaft 10 and preventing it from being damaged due to overheating. At the same time, considering the recycling of the coolant, we detachably fixed a collection box 45 on one side of the vertical plate 2 close to the movable seat 19. The collection box 45 is located below the rotating shaft 4 and is used to collect the coolant sprayed from the coolant pipe 51. A drain pipe 46 is fixedly passed through the bottom inner wall of the collection box 45. In this way, we can recycle the collected coolant through the drain pipe 46, which saves resources and avoids the waste of coolant.

[0063] Reference Figure 2 In addition, in order to ensure the stability of the rotating shaft 4 during rotation, we design the end of the rotating shaft 4 away from the first motor 5 to rotate with the inner wall of one side of the collecting box 45, so that the collecting box 45 provides additional support for the rotating shaft 4.

[0064] Example 2: Reference Fig.13 , Fig.14, improved on the basis of Example 1: we also set a circular groove 47 on the bottom inner wall of the lifting groove 7, and a third spring 49 is fixed on the bottom inner wall of the circular groove 47. A lifting rod 48 is slidably connected in the circular groove 47, and the top of the lifting rod 48 is fixedly connected to the top of the third spring 49. A pressure sensor 50 is also fixed on the top of the lifting rod 48, and the pressure sensor 50 cooperates with the lifting block 9 to test the height of the mandrel 10. When the lifting block 9 drops to a certain height, it will produce an extrusion force on the pressure sensor 50. At this time, we can judge that the mandrel 10 is at the same height as the axis of the topmost mounting cylinder 28. Then, the lifting block 9 and the mandrel 10 will continue to move down a certain distance, and the annular blank 3 will be rolled again to provide space for installing the core mold 13. Then, the mandrel 10 will move up to a position at the same height as the mounting cylinder 28, which is convenient for the subsequent installation of the mandrel 13. Through such a design, we can accurately control the height of the mandrel 10 to ensure the smooth progress of the rolling process.

[0065] A method for using a direct rolling forming die for a flange on a ring rolling machine comprises the following steps:

[0066] S1. Place the annular blank 3 to be punched and expanded on the model ring 6. One end of the mandrel 10 passes through the through hole in the annular blank 3. The rotating shaft 43 moves upward under the elastic force of the second spring 42, and cooperates with the model ring 6 to limit the annular blank 3. During rolling, the second motor 11 drives the mandrel 10 to rotate, and the cylinder 8 pushes the mandrel 10 downward through the lifting block 9. Then the first motor 5 drives the model ring 6 to rotate through the rotating shaft 4. At this time, the mandrel 10 cooperates with the model ring 6 to roll the annular blank 3. During the rolling process, the coolant pipe 51 is connected to the external coolant through the water pump, and the coolant is sprayed on the mandrel 10 to cool the mandrel 10. The collecting box 45 and the drain pipe 46 cooperate to recycle the coolant.

[0067] S2, when the lifting block 9 moves downward, the connecting block 38 pulls the lifting plate 32 upward through the pull rope 37, so that the two guide wheels 35 can squeeze the two sides of the annular blank 3 to control the thickness of the annular blank 3, and when it is necessary to roll annular blanks 3 of different thicknesses, the spacing between the two guide wheels 35 can be controlled by rotating the bidirectional screw rod 34 to meet the requirements of rolling different annular blanks 3;

[0068] S3. When the inner wall of the annular blank 3 needs to be rolled, a corresponding core mold 13 needs to be installed on the outer wall of the mandrel 10 for rolling; specifically, when the lifting block 9 is lowered to a certain height, an extrusion force is generated on the pressure sensor 50, and at this time, the mandrel 10 is at the same height as the uppermost installation cylinder 28, and then the lifting block 9 and the mandrel 10 continue to move down a certain distance, and the annular blank 3 is rolled again to provide space for installing the core mold 13, and then the mandrel 10 moves up to a position at the same height as the installation cylinder 28, so as to facilitate the subsequent installation of the core mold 13;

[0069] S4. Install the corresponding core mold 13 as needed, and through the meshing of the first gear 26 and the second gear 27, the third motor 25 drives the hollow disk 22 to rotate until the corresponding core mold 13 moves to the highest position, and then the output shaft of the hydraulic cylinder 20 pushes the moving seat 19 to move in the direction of the core shaft 10, until the core mold 13, the connecting disk 14 and the connecting head 15 in the installation cylinder 28 cooperate with the core shaft 10, and the core shaft 10 passes through the core mold 13, the connecting disk 14 and the connecting head 15 in sequence, until the plug-in block 12 is inserted into the extrusion cylinder 29, and one end of the connecting head 15 contacts the extrusion cylinder 29, and then the moving seat 19 and the extrusion cylinder 29 move outward. The connecting head 15 is disengaged from the installation cylinder 28, and the trapezoidal block 18 loses the extrusion of the extrusion cylinder 29 and extends outward under the elastic force of the first spring 17, and the trapezoidal block 18 is just stuck at one end of the connecting head 15, and the slider in the connecting disk 14 cooperates with the slide groove on the outer wall of the core shaft 10, and the slider in the connecting disk 14 conflicts with the inner wall of one side of the slide groove on the outer wall of the core shaft 10. At this time, the trapezoidal block 18, the slider, and the slide groove cooperate to fix the core mold 13 on the outer wall of the core shaft 10. In the later process of the core shaft 10 rotating to roll the annular blank 3, the core mold 13 is synchronously driven to rotate to roll the inner wall of the annular blank 3.

[0070] S5. When the core mold 13 needs to be replaced, the hydraulic cylinder 20 pushes the movable seat 19 to move toward the core shaft 10, and one end of the connector 15 is inserted into the corresponding installation cylinder 28. As the movable seat 19 continues to be pushed, the connector 15 is completely immersed in the installation cylinder 28. The connector 15 and the installation cylinder 28 are sealed and matched. The solenoid valve on the air guide tube 30 is opened, and the connector 15 discharges the air in the installation cylinder 28 through the air guide tube 30. When the plug-in block 12 is inserted into the extrusion cylinder 29, the extrusion cylinder 29 pushes the trapezoidal block 18 into In the sliding groove 16, the trapezoidal block 18 releases the clamping of the connecting head 15, and then the solenoid valve on the adjacent connecting pipe 31 is opened. The suction pump 23 generates suction in the hollow disk 22 and the connecting pipe 31 on the mounting tube 28 through the connecting pipe 24, and negative pressure is generated in the mounting tube 28, so that the replaced core mold 13 can be adsorbed on the mounting tube 28. When the moving seat 19 moves outward, the core mold 13 can be taken out, and then step S4 is repeated to complete the replacement of the corresponding core mold 13, thereby completing the rolling of the inner wall of the annular blank 3.

[0071] However, as is well known to those skilled in the art, the working principles and wiring methods of the first motor 5, the second motor 11, the pressure sensor 50, the cylinder 8, the third motor 25, the hydraulic cylinder 20 and the suction pump 23 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any optional selections according to their needs or convenience.

[0072] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A direct rolling forming die for flange on a ring rolling machine, characterized in that: The machine comprises a base (1), a vertical plate (2) is fixed on one side of the top of the base (1), a rotating shaft (4) is rotatably penetrated in the vertical plate (2), a first motor (5) is fixed to the side of the vertical plate (2) away from the base (1) through a frame, an output shaft of the first motor (5) is fixedly connected to one end of the rotating shaft (4), and a model ring (6) is detachably fixedly sleeved on the outer wall of the rotating shaft (4), and a corresponding model ring (6) can be replaced according to rolling requirements; It also includes a mandrel (10) which rotates on one side of the vertical plate (2) and is located above the rotating shaft (4); the model ring (6) cooperates with the mandrel (10) to roll the annular blank (3); the outer wall of the mandrel (10) is provided with a mandrel mold (13); and the mandrel mold (13), the mandrel (10) and the model ring (6) cooperate to roll the inner wall of the annular blank (3); It also includes two guide wheels (35), and the two guide wheels (35) are both located above the mandrel (10), and the two guide wheels (35) are located on both sides of the annular blank (3) and are used to control the thickness of the annular blank (3); It also includes a movable seat (19) which slides on the top of the base (1), a rotating tube (21) rotatingly passing through the movable seat (19), a hollow disk (22) being provided on the side of the movable seat (19) close to the vertical plate (2), one end of the rotating tube (21) being fixedly extended into the hollow disk (22), a hydraulic cylinder (20) being fixed on the top of the base (1), and an output shaft of the hydraulic cylinder (20) being fixedly connected to a side of the movable seat (19) away from the vertical plate (2); A fixing structure, arranged at one end of the core shaft (10), and used for fixing the core mold (13) to the outer wall of the core shaft (10); A control structure, arranged in the vertical plate (2), used to ensure that the guide wheel (35) always contacts the annular blank (3); A replacement structure, arranged on one side of the movable seat (19), for replacing the core mold (13) of the outer wall of the core shaft (10); The control structure comprises a lifting plate (32) sliding on one side of the vertical plate (2), the lifting plate (32) being located directly above the core shaft (10), a strip groove being provided at the bottom of the lifting plate (32), a bidirectional screw rod (34) being rotatably connected in the strip groove, one end of the bidirectional screw rod (34) being rotatably extended to one side of the lifting plate (32), two nut blocks (33) being slidably connected in the strip groove, the two nut blocks (33) being respectively threadedly connected to the positive and negative thread segments of the bidirectional screw rod (34), the two guide wheels (35) being respectively rotatable at the bottoms of the two nut blocks (33), and the rotation of the bidirectional screw rod (34) controlling the two guide wheels (35) The vertical plate (2) is provided with a lifting groove (7), a lifting block (9) is slidably connected in the lifting groove (7), a cylinder (8) is fixed on the inner wall of the top of the lifting groove (7), an output shaft of the cylinder (8) is fixedly connected to the top of the lifting block (9), a connecting block (38) is fixed on one side of the top of the lifting block (9), a pull rope (37) is fixed on the top of the connecting block (38), a guide wheel (36) is rotatably connected to the top of the vertical plate (2), one end of the pull rope (37) is wound around the outer wall of the guide wheel (36) and is fixedly connected to the top of the lifting plate (32), and the lifting of the lifting block (9) is used to control the lifting of the lifting plate (32); One end of the mandrel (10) away from the movable seat (19) rotates and penetrates the lifting block (9); a second motor (11) is fixed to the side of the lifting block (9) away from the movable seat (19) through a frame; an output shaft of the second motor (11) is fixedly connected to one end of the mandrel (10) through a coupling, and is used to control the mandrel (10) to cooperate with the model ring (6) to roll the annular blank (3).

2. The direct rolling forming die for flange on a ring rolling machine according to claim 1, characterized in that: The fixing structure comprises a plug-in block (12) fixed to one end of the core shaft (10) close to the hollow disk (22); a connecting disk (14) is fixed to one end of the core mold (13) close to the hollow disk (22); a plurality of slide grooves are provided on the outer wall of the core shaft (10); a plurality of sliders are fixed to the inner wall of the connecting disk (14); the connecting disk (14) is slidably connected to the core shaft (10) via the slide grooves and the sliders; the core shaft (10) drives the core mold (13) and the connecting disk (14) to rotate via the slide grooves and the sliders; a connector (15) is rotatably connected to the side of the connecting disk (14) away from the core mold (13); the plug-in block One end of the plug-in block (12) passes through the connector (15), and the top and bottom of the plug-in block (12) are both provided with sliding grooves (16). The inner walls of the two sliding grooves (16) close to each other are both fixed with first springs (17), and the ends of the two first springs (17) away from each other are both fixed with trapezoidal clamping blocks (18), and the two trapezoidal clamping blocks (18) are slidably arranged in the corresponding sliding grooves (16). The trapezoidal clamping blocks (18) are used to limit the connector (15), and the core mold (13) is fixed to the outer wall of the core shaft (10) through the cooperation of the trapezoidal clamping blocks (18), the connector (15) and the sliding grooves and the sliders.

3. The direct rolling forming die for flange on a ring rolling machine according to claim 2, characterized in that: The replacement structure comprises an air pump (23) fixed to a side of the movable seat (19) away from the vertical plate (2); a connecting pipe (24) is fixed to an air inlet of the air pump (23); one end of the connecting pipe (24) extends into the rotating tube (21) and is rotatably connected to the rotating tube (21); a second gear (27) is fixedly sleeved on the outer wall of the rotating tube (21); a third motor (25) is fixed to a side of the movable seat (19) away from the vertical plate (2) through a frame; a first gear (26) meshing with the second gear (27) is fixed to an output shaft of the third motor (25); the third motor (25) drives the hollow disk (22) to rotate via the first gear (26) and the second gear (27); a plurality of mounting cylinders (28) are fixed to a side of the hollow disk (22) close to the vertical plate (2); the connector (15) is sealed and slidably extended to the mounting cylinder (28); The plurality of mounting cylinders (28) are provided with an extrusion cylinder (29) fixed to the inner wall of one side close to the hollow disk (22). The plug-in block (12) slides and extends into the extrusion cylinder (29) to extrude the trapezoidal block (18) into the sliding groove (16). The extrusion cylinder (29) contacts one end of the connector (15). The outer walls of the plurality of mounting cylinders (28) are fixedly connected to a connecting pipe (31). The other ends of the plurality of connecting pipes (31) are connected to the hollow disk (22). The suction pump (23) controls the negative pressure in the corresponding mounting cylinder (28) to adsorb the connector (15) in the mounting cylinder (28). The plurality of mounting cylinders (28) are fixedly connected to an air guide pipe (30) on one side close to each other to balance the pressure in the mounting cylinder (28). The outer walls of the connecting pipe (31) and the air guide pipe (30) are provided with an electromagnetic valve.

4. The direct rolling forming die for flange on a ring rolling machine according to claim 3, characterized in that: Two vertical slots (39) are provided on one side of the vertical plate (2) close to the movable seat (19), and a fixing rod (41) is longitudinally fixed in each of the two vertical slots (39). The outer walls of the two fixing rods (41) are slidably sleeved with a mounting block (40), and the outer walls of the two fixing rods (41) are sleeved with a second spring (42) fixedly connected to the bottom of the mounting block (40), and the bottom ends of the two second springs (42) are respectively fixedly connected to the bottom inner walls of the corresponding vertical slots (39). The two mounting blocks (40) are rotatably connected to a rotating shaft (43) on one side close to the movable seat (19), and the two rotating shafts (43) cooperate with the model ring (6) to limit and support the annular blank (3).

5. The direct rolling forming die for flange on a ring rolling machine according to claim 4, characterized in that: Two support plates (44) are slidably connected to one side of the vertical plate (2) close to the movable seat (19); one end of the two rotating shafts (43) away from the mounting block (40) is rotatably connected to the corresponding support plates (44), respectively; the support plates (44) are used to support the rotating shafts (43).

6. The direct rolling forming die for flange on a ring rolling machine according to claim 5, characterized in that: A coolant pipe (51) located above the core shaft (10) is fixed on one side of the vertical plate (2), and the coolant pipe (51) is connected to an external water pump through a hose, and is used to spray coolant on the core shaft (10). A collection box (45) located below the rotating shaft (4) is detachably fixed on one side of the vertical plate (2) close to the movable seat (19), and is used to collect coolant. A drain pipe (46) is fixedly passed through the bottom inner wall of the collection box (45), and is used to recycle the coolant. An end of the rotating shaft (4) away from the first motor (5) is rotatably matched with an inner wall of one side of the collection box (45), and is used to support the rotating shaft (4).

7. The direct rolling forming die for flange on a ring rolling machine according to claim 6, characterized in that: A circular groove (47) is provided on the inner wall at the bottom of the lifting groove (7), a third spring (49) is fixed on the inner wall at the bottom of the circular groove (47), a lifting rod (48) fixedly connected to the top of the third spring (49) is slidably connected in the circular groove (47), a pressure sensor (50) is fixed on the top of the lifting rod (48), and the pressure sensor (50) cooperates with the lifting block (9) to test the height of the core shaft (10) so that the core shaft (10) and the axis center line of the uppermost mounting cylinder (28) are at the same height.

8. The method for using the direct rolling forming die for flange on a ring rolling machine according to claim 7 is characterized in that: The following steps are involved: S1, placing the annular blank (3) on the model ring (6), the mandrel (10) passing through it, and being limited by the rotating shaft (43) and the second spring (42); during rolling, the mandrel (10) is driven to rotate by the second motor (11), the cylinder (8) pushes the lifting block (9) to move downward, and at the same time the first motor (5) drives the model ring (6) to rotate, so as to achieve the rolling of the blank; the coolant pipe (51) sprays coolant through a water pump to cool the mandrel (10), and the coolant is recovered by the collecting box (45) and the drain pipe (46); S2, when the lifting block (9) moves downward, the connecting block (38) pulls the lifting plate (32) through the pull rope (37), so that the guide wheel (35) extrude the billet to control the thickness; the bidirectional screw rod (34) can adjust the spacing of the guide wheels (35) to meet the rolling requirements of different billets; S3, when the inner wall of the billet needs to be rolled, the core mold (13) is installed; when the lifting block (9) is lowered to a certain height, the core shaft (10) is aligned with the installation cylinder (28), and continues to move downward to provide space for installing the core mold (13), and then moves upward to prepare for installing the core mold (13); S4, installing the core mold (13) as required, the third motor (25) drives the hollow disk (22) to rotate through the first gear (26) and the second gear (27), the movable seat (19) is pushed by the hydraulic cylinder (20), and the core mold (13), the connecting disk (14) and the connecting head (15) are matched with the core shaft (10); after the core shaft (10) is penetrated, the movable seat (19) and the extrusion cylinder (29) move outward, the trapezoidal clamping block (18) clamps the connecting head (15) under the action of the first spring (17), and the slider cooperates with the slide groove of the core shaft (10) to fix the core mold (13); S5. When replacing the core mold (13), the hydraulic cylinder (20) pushes the movable seat (19), and the connecting head (15) is inserted into the installation tube (28). As the movable seat (19) continues to be pushed, the connecting head (15) and the installation tube (28) are sealed and matched; the solenoid valve is opened to exhaust air, and the extrusion tube (29) pushes the trapezoidal block (18) into the sliding groove (16) to release the clamping; the suction pump (23) generates suction through the connecting pipe (24) and the connecting pipe (31), forming a negative pressure to absorb the replaced core mold (13), and the movable seat (19) moves outward to remove the core mold (13), and then repeats step S4 to complete the replacement, thereby realizing the rolling of the inner wall of the billet.

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