Annular forging superhigh pressure bulging device and bulging method

Abstract

This invention belongs to the field of metallurgical equipment technology, and specifically relates to an ultra-high pressure bulging device and method for annular forgings. The ultra-high pressure bulging device for annular forgings includes a central pressure-bearing body, which is cylindrical. Two layers of ultra-high pressure hydraulic cylinders are evenly distributed on the upper and lower sides of the cylindrical surface of the central pressure-bearing body. The output ends of the two vertically arranged ultra-high pressure hydraulic cylinders are equipped with parallel plungers. The ends of the two plungers are respectively connected to the same bulging block. A bulging mold assembly is placed outside the bulging block. The bulging mold assembly is fan-shaped, and a worktable is provided below the bulging mold assembly. Multiple sets of slide rails are provided on the worktable, and the bulging mold assembly is slidably connected to the slide rails. The annular forging to be bulged is placed outside the bulging mold assembly. This invention uses ultra-high pressure hydraulic cylinders to directly drive multiple sliders in the horizontal direction to directly generate bulging force from inside the annular forging, thereby eliminating residual stress in the annular forging and reducing or eliminating ellipticity.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment technology, and specifically relates to an ultra-high pressure bulging device and expansion method for ring forgings. Background Technology

[0002] With the rapid and sustained economic development, large-scale key projects at home and abroad have been implemented one after another, large-scale wind power projects have been put into use, and the size of heavy-lift launch vehicles has continued to increase. The requirements for large-diameter ring metal forgings are getting higher and higher, and the demand is constantly increasing. Ring forgings, especially large-sized ring forgings, are important components of rockets, and their overall performance affects rocket launch and flight.

[0003] Common forming methods for ring forgings include lever reaming, radial-axial CNC rolling, segmented welding, and additive manufacturing, with radial-axial CNC rolling being the most prevalent. Uneven stress during rolling generates residual stress, and multi-roll coordinated control can lead to ellipticity. Therefore, bulging stretching is necessary to eliminate participating stress and reduce or eliminate ellipticity. Currently, the mechanical bulging method uses a large hydraulic cylinder to drive a tapered conical wedge from below. Force is converted to a horizontal direction through inclined plane friction, driving multiple sliders (16 or 18) to push the ring forging outwards, generating bulging force. However, deviations in the inclined plane cause uneven bulging force, and the inclined plane friction results in significant energy loss, reducing equipment reliability. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an ultra-high pressure bulging device and bulging method for annular forgings. This device uses an ultra-high pressure hydraulic cylinder to directly drive multiple sliders in the horizontal direction to generate bulging force directly from inside the annular forging, thereby eliminating residual stress in the annular forging and reducing or eliminating ellipticity.

[0005] The technical solution of the present invention is as follows: an ultra-high pressure bulging device for annular forgings, comprising a central pressure bearing body, the central pressure bearing body being cylindrical, and two layers of ultra-high pressure cylinders evenly distributed on the upper and lower sides of the cylindrical side of the central pressure bearing body. The output ends of the two ultra-high pressure cylinders arranged vertically are provided with parallel plungers, and the ends of the two plungers are respectively connected to the same bulging block. A bulging mold assembly is placed on the outside of the bulging block. The bulging mold assembly is fan-shaped, and a worktable is provided below the bulging mold assembly. Multiple sets of slide rails are provided on the worktable, and the bulging mold assembly is slidably connected to the slide rails. Annular forgings to be bulged are placed on the outside of the bulging mold assembly.

[0006] The ultra-high pressure cylinders in each layer are evenly distributed around the central axis of the central pressure-bearing body, and the number of ultra-high pressure cylinders in each layer is 16 or 18.

[0007] The top of the workbench is provided with a cavity, and a return cylinder is provided inside the cavity. The output end of the return cylinder is connected to a slide rail.

[0008] A rotating roller is provided below the annular forging. The rotating roller is higher than the upper surface of the slide rail, and the upper surface of the rotating roller is fixedly connected to the annular forging to be expanded.

[0009] The ultra-high pressure hydraulic cylinder includes a cylinder bottom, an oil inlet is provided on the side of the cylinder bottom, and an inner liner is fixedly connected to the right side of the cylinder bottom. The inner liner is hollow and has a plunger.

[0010] The outer side of the lining is provided with a layer of wound steel wire.

[0011] The oil inlet has a pressure resistance value of ≥600MPa.

[0012] A method for high-pressure bulging of annular forgings, using a high-pressure bulging device for annular forgings as described above, includes the following steps:

[0013] S1: Bulging process: Ultra-high pressure liquid is simultaneously introduced into all ultra-high pressure cylinders through the oil inlet, with a pressure greater than 600MPa. Under the liquid pressure, the plunger is pushed outward, thereby pushing the bulging block outward, which in turn pushes the bulging die group outward. The outward movement of the bulging die group generates pressure on the inner wall of the ring forging, thereby realizing the bulging of the ring forging.

[0014] S2: After completing one expansion, the ultra-high pressure cylinder releases pressure to the hydraulic system through the oil inlet; after the ultra-high pressure cylinder is depressurized, the return cylinder pushes the slide rail to move back to the center of the central pressure body, which drives the expansion mold group placed on the slide rail to return to the center, thereby pushing the plunger to return, and the oil of the ultra-high pressure cylinder is discharged into the hydraulic system from the oil inlet.

[0015] In step S2, when the bulging die group has completed its return stroke, the inner wall of the annular forging is no longer in contact with the bulging die group. At this time, the drive roller rotates, thereby causing the annular forging placed on the roller to rotate around the center. After the annular forging rotates, it can be bulged again according to step S. This process can be repeated to bulge the annular forging multiple times, achieving the designed bulging amount and realizing the uniformity of the bulging deformation.

[0016] The technical advantages of this invention are as follows: 1. This invention directly drives the forming block from the end of the slider using an ultra-high pressure hydraulic cylinder, eliminating the energy conversion of the previous inclined friction pair and eliminating the energy loss and poor equipment reliability caused by friction between inclined friction pairs; 2. The ultra-high pressure hydraulic cylinders of this invention are distributed vertically, which can reduce the piston diameter of the ultra-high pressure hydraulic cylinder, thereby reducing the diameter of the joint surface between the hydraulic cylinder and the forming block and increasing the applicability of the forming device; 3. The ultra-high pressure hydraulic cylinder of this invention uses ultra-high strength material as the lining of the ultra-high pressure container, which can withstand a certain range of ultra-high pressure. The outer surface of the lining adopts a steel wire winding structure, and the prestress of the steel wire winding is applied to the lining, so that compressive stress is generated on the inner surface of the lining, which can improve the pressure resistance of the lining and thus withstand the required ultra-high pressure.

[0017] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an ultra-high pressure bulging device for annular forgings according to an embodiment of the present invention.

[0019] Figure 2 This is a top view schematic diagram of an ultra-high pressure bulging device for annular forgings according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the ultra-high pressure hydraulic cylinder according to an embodiment of the present invention.

[0021] Reference numerals: 1-Central pressure bearing body, 2-Ultra-high pressure cylinder, 3-Expansion block, 4-Expansion mold assembly, 5-Workbench, 6-Ring forging, 21-Cylinder bottom, 22-Oil inlet, 23-Inner liner, 24-Wound steel wire layer, 25-Plunger, 51-Return cylinder, 52-Slide rail, 53-Roller. Detailed Implementation

[0022] Example 1 Figures 1-3 As shown, an ultra-high pressure bulging device for annular forgings includes a central pressure-bearing body 1, which is cylindrical. Two layers of ultra-high pressure cylinders 2 are evenly distributed on the cylindrical side of the central pressure-bearing body 1. The output ends of the two ultra-high pressure cylinders 2 are equipped with parallel plungers 25. The ends of the two plungers 25 are respectively connected to the same bulging block 3. A bulging mold group 4 is placed on the outside of the bulging block 3. The bulging mold group 4 is fan-shaped. A worktable 5 is provided below the bulging mold group 4. Multiple sets of slide rails 52 are provided on the worktable 5. The bulging mold group 4 is slidably connected to the slide rails 52. An annular forging 6 to be bulged is placed on the outside of the bulging mold group 4.

[0023] In practical use, the present invention directly drives the expansion block 3 from the end of the expansion block 3 through the ultra-high pressure oil cylinder 2, eliminating the energy conversion of the previous inclined friction pair, eliminating the energy loss caused by friction between the inclined friction pairs and the resulting poor equipment reliability; at the same time, the ultra-high pressure oil cylinder 2 is distributed vertically, which can reduce the plunger diameter of the ultra-high pressure oil cylinder 2, thereby reducing the diameter of the joint surface between the oil cylinder and the expansion block 3, increasing the applicability of the expansion device.

[0024] Example 2 Preferably, based on Example 1, in this example, the ultra-high pressure cylinders 2 in each layer are evenly distributed around the central axis of the central pressure-bearing body 1, and the number of ultra-high pressure cylinders 2 in each layer is 16 or 18.

[0025] In actual use, the present invention uses multiple sliders evenly distributed in a ring, 16 or 18 in total, to expand the annular forging from the inside out along the inner surface of the annular forging. The expanding blocks exert force outward under the drive of the driving device, which can expand the annular forging. Each expanding block is driven by two ultra-high pressure oil cylinders arranged vertically. The ultra-high pressure oil cylinders 2 are evenly distributed around the circumference of the ring, thus forming a circle.

[0026] Example 3 Preferably, based on Example 1 or Example 2, in this example, the top of the workbench 5 is provided with a cavity, and a return cylinder 51 is provided in the cavity. The output end of the return cylinder 51 is connected to a slide rail 52.

[0027] In actual use, after one expansion, the ultra-high pressure cylinder 2 releases pressure to the hydraulic system through the oil inlet 22; after the ultra-high pressure cylinder 2 is released, the return cylinder 51 pushes the slide rail 52 to move back to the center, which in turn drives the expansion mold group 4 placed on the slide rail 52 to return to the center.

[0028] Example 4 Preferably, based on Example 1 or Example 3, in this example, a rotating roller 53 is provided below the annular forging 6. The rotating roller 53 is higher than the upper surface of the slide rail 52, and the upper surface of the rotating roller 53 is fixedly connected to the annular forging 6 to be expanded.

[0029] In actual use, after each bulging process, the present invention drives the bulging mold assembly 4 to retract, and then drives the rotating roller 53 to rotate, thereby causing the annular forging 6 placed on the rotating roller to rotate around the center. The annular forging rotates at an angle, and then drives the slider to move outward again to bulge, repeating this process several times until the required deformation amount or roundness is achieved.

[0030] Example 5 Preferably, based on Example 1 or Example 4, in this example, the ultra-high pressure cylinder 2 includes a cylinder bottom 21, an oil inlet 22 is provided on the side of the cylinder bottom 21, and an inner liner 23 is fixedly connected to the right side of the cylinder bottom 21. The inner liner 23 is hollow inside and is provided with a plunger 25.

[0031] In actual use, the ultra-high pressure cylinder 2 of this invention uses ultra-high strength material as the inner liner 23 of the high pressure cylinder, which can withstand a certain range of ultra-high pressure.

[0032] Example 6 Preferably, based on Example 1 or Example 5, in this example, the outer side of the liner 23 is provided with a wound steel wire layer 24.

[0033] In actual use, the outer surface of the high-pressure cylinder liner 23 of the present invention is a steel wire winding layer 24. The steel wire winding 24 will apply a pre-designed prestress to the liner 23, so that the inner surface of the liner 23 will generate compressive stress, which can greatly improve the pressure resistance of the liner 23, thereby enabling it to withstand the required ultra-high pressure.

[0034] Example 7 Preferably, based on Example 1 or Example 6, in this example, the pressure resistance value of the oil inlet 22 is ≥600MPa.

[0035] In actual use, the oil inlet 22 of this invention has a pressure resistance value ≥600MPa. Under liquid pressure, it pushes the plunger 25 outward, thereby pushing the bulging block 3 outward, and then pushing the bulging die assembly 4 outward. The outward movement of the bulging die assembly 4 generates pressure on the inner wall of the annular forging 6, thereby realizing the bulging of the annular forging 6. Example 8

[0036] A method for high-pressure bulging of annular forgings, using a high-pressure bulging device for annular forgings as described above, includes the following steps:

[0037] S1: Bulging process: Ultra-high pressure liquid is simultaneously introduced into all ultra-high pressure cylinders 2 through oil inlet 22, with a pressure greater than 600MPa. Under the liquid pressure, the plunger 25 is pushed outward, thereby pushing the bulging block 3 outward, which in turn pushes the bulging mold group 4 outward. The outward movement of the bulging mold group 4 generates pressure on the inner wall of the ring forging 6, thereby realizing the bulging of the ring forging 6.

[0038] S2: After completing one expansion, the ultra-high pressure cylinder 2 releases pressure to the hydraulic system through the oil inlet 22; after the ultra-high pressure cylinder 2 is released, the return cylinder 51 pushes the slide rail 52 to move back to the center of the central pressure body 1, which drives the expansion mold group 4 placed on the slide rail 52 to return to the center, thereby pushing the plunger 25 to return, and the oil of the ultra-high pressure cylinder 2 is discharged into the hydraulic system from the oil inlet 22.

[0039] In step S2, when the bulging mold group 4 has completed its return stroke, the inner wall of the annular forging 6 is no longer in contact with the bulging mold group 4. At this time, the drive roller 53 rotates, thereby causing the annular forging 6 placed on the roller 53 to rotate around the center. After the annular forging 6 rotates, it can be bulged again according to step S1. This process can be repeated to bulge the annular forging 6 multiple times, achieving the designed bulging amount and realizing the uniformity of the bulging deformation.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-pressure bulging device for annular forgings, characterized in that: The system includes a central pressure-bearing body (1), which is cylindrical. Two layers of ultra-high pressure cylinders (2) are evenly distributed on the cylindrical side of the central pressure-bearing body (1). The output ends of the two ultra-high pressure cylinders (2) are equipped with parallel plungers (25). The ends of the two plungers (25) are respectively connected to the same expansion block (3). An expansion mold assembly (4) is placed on the outside of the expansion block (3). The expansion mold assembly (4) is fan-shaped. A workbench (5) is provided below the expansion mold assembly (4). The workbench (5) is equipped with... Multiple sets of slide rails (52), the bulging mold group (4) is slidably connected to the slide rails (52), the outer side of the bulging mold group (4) is placed with an annular forging (6) to be bulged, the ultra-high pressure cylinder (2) includes a cylinder bottom (21), the side of the cylinder bottom (21) is provided with an oil inlet (22), the cylinder bottom (21) is fixedly connected with an inner liner (23), the inner liner (23) is hollow inside and provided with a plunger (25), the outer side of the inner liner (23) is provided with a wound steel wire layer (24), and the pressure resistance value of the oil inlet (22) is ≥600MPa.

2. The ultra-high pressure bulging device for annular forgings according to claim 1, characterized in that: The ultra-high pressure cylinders (2) in each layer are evenly distributed around the central axis of the central pressure-bearing body (1), and the number of ultra-high pressure cylinders (2) in each layer is 16 or 18.

3. The ultra-high pressure bulging device for annular forgings according to claim 1, characterized in that: The top of the workbench (5) is provided with a cavity, and a return cylinder (51) is provided in the cavity. The output end of the return cylinder (51) is connected to a slide rail (52).

4. The ultra-high pressure bulging device for annular forgings according to claim 1, characterized in that: A rotating roller (53) is provided below the annular forging (6). The rotating roller (53) is higher than the upper surface of the slide rail (52). The upper surface of the rotating roller (53) is fixedly connected to the annular forging (6) to be expanded.

5. A method for ultra-high pressure bulging of annular forgings, using an ultra-high pressure bulging device for annular forgings as described in any one of claims 1 to 4, characterized in that: Includes the following steps: S1: Bulging process: Ultra-high pressure liquid is simultaneously introduced into all ultra-high pressure cylinders (2) through the oil inlet (22), with a pressure greater than 600MPa. Under the liquid pressure, the plunger (25) is pushed outward, thereby pushing the bulging block (3) to move outward, and then pushing the bulging mold group (4) to move outward. The outward movement of the bulging mold group (4) generates pressure on the inner wall of the ring forging (6), thereby realizing the bulging of the ring forging (6). S2: After completing one expansion, the ultra-high pressure cylinder (2) releases pressure to the hydraulic system through the oil inlet (22); after the ultra-high pressure cylinder (2) is released, the return cylinder (51) pushes the slide rail (52) to move back to the center of the central pressure body (1), which drives the expansion mold group (4) placed on the slide rail (52) to return to the center, thereby pushing the plunger (25) to return, and the oil of the ultra-high pressure cylinder (2) is discharged into the hydraulic system from the oil inlet (22).

6. The method for ultra-high pressure bulging of annular forgings according to claim 5, characterized in that: In step S2, when the bulging mold group (4) has completed its return stroke, the inner wall of the annular forging (6) is no longer in contact with the bulging mold group (4). At this time, the drive roller (53) rotates, thereby causing the annular forging (6) placed on the roller (53) to rotate around the center. After the annular forging (6) rotates, it is bulged again according to step S1. This process can be repeated to bulge the annular forging (6) multiple times, achieving the designed bulging amount and realizing the uniformity of the bulging deformation.

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