A straightening process and apparatus for large-size, thick-walled, heat-resistant, thick-walled magnesium alloy cylindrical parts

Abstract

This invention proposes a straightening process and apparatus for large-sized, thick-walled, heat-resistant, thick-walled magnesium alloy cylindrical parts, comprising the following steps: placing the thick-walled magnesium alloy cylindrical part into a straightening mold and fixing it; then filling the inner cavity of the magnesium alloy cylindrical part with solid particulate media, graphite or BN, and compacting it using a press; transferring it to a mold and then to a heating fixture for heating and heat preservation; after reaching a preset temperature and time, turning on an ultrasonic generator, then applying pressure and maintaining it; after maintaining the pressure for a certain time, turning off the ultrasonic generator and releasing the pressure; transferring the straightening mold to a platform, cooling it, removing the solid particulate media, and taking out the cylindrical part. The solid particulate media precision straightening method for thick-walled magnesium alloy cylindrical parts provided by this invention solves the technical problem of straightening large-sized, thick-walled magnesium alloy cylindrical parts by using solid particulate media as the force transmission medium, and achieves precision straightening of thick-walled magnesium alloy cylindrical parts.

Description

Technical Field

[0001] This invention belongs to the field of plastic processing of metal materials, specifically relating to a straightening process and apparatus for large-sized thick-walled magnesium alloy cylindrical parts. Background Technology

[0002] Magnesium alloys have gained widespread attention and application in industries such as aerospace, shipbuilding, weaponry, electronics, and biomedicine due to their advantages such as light weight, high specific strength, and good vibration damping. However, the close-packed hexagonal structure of magnesium alloys significantly reduces their plastic deformation capacity. To improve the processing performance of magnesium alloys, plastic forming under triaxial compressive stress, such as extrusion, is usually required. However, magnesium alloy profiles, especially magnesium alloy tubes, prepared by these processes often exhibit spatial distortion due to differences in extrusion speeds at different locations, limiting the wider application of magnesium alloy tubes. Therefore, precision forming through subsequent straightening processes is necessary. For thin-walled magnesium alloy tubes (wall thickness <5mm), liquid filling can be used. However, for thick-walled magnesium alloy tubular parts / cylindrical components, how to achieve precision manufacturing and high performance using appropriate processes has become an urgent technical challenge to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a method and apparatus for straightening large-size thick-walled magnesium alloy cylindrical parts using solid particle media, which solves the technical problem of precision manufacturing of thick-walled magnesium alloy cylindrical parts and realizes rapid, flexible and precise straightening of large-size thick-walled magnesium alloy cylindrical parts.

[0004] A straightening process for large-sized, thick-walled, heat-resistant, thick-walled magnesium alloy cylindrical parts specifically includes the following steps:

[0005] Step S1: Place the thick-walled magnesium alloy cylindrical part into the straightening mold and fix it;

[0006] Step S2: Apply a layer of high-temperature resistant rubber to the inner wall of the thick-walled magnesium alloy cylindrical part;

[0007] Step S3: Then, the solid particulate medium is filled into the inner cavity of the magnesium alloy cylindrical part and compacted using a press.

[0008] Step S4: Set a heating fixture on the outside of the orthopedic mold, and heat and keep it warm in the heating fixture;

[0009] Step S5: Set up ultrasonic generators on both sides of the orthopedic mold. After the preset temperature and time are reached, turn on the ultrasonic generators, then apply pressure and maintain the pressure.

[0010] Step S6: After maintaining the pressure for a certain period of time, turn off the ultrasonic generator and release the pressure;

[0011] Step S7: Transfer the orthopedic mold to the platform, cool it down, then remove the solid particulate medium inside the thick-walled magnesium alloy cylindrical part, and take out the cylindrical part.

[0012] In step S1, the wall thickness of the thick-walled magnesium alloy cylindrical component is >5mm, and the material of the cylindrical component is not limited to magnesium alloy.

[0013] In step S2, the high-temperature resistant rubber is positioned between the solid particles and the thick-walled magnesium alloy cylindrical part, which can prevent the solid particle medium from causing a decrease in the inner surface quality of the thick-walled magnesium alloy cylindrical part during the shaping process.

[0014] In step S3, the pressure applied by the press is 5-10 MPa.

[0015] In step S3, the solid particulate medium is graphite or BN particles.

[0016] In step S4, the heating temperature is 300-500℃ and the holding time is 8-16h.

[0017] In step S6, the pressure holding time is 1-5 minutes.

[0018] A shaping device for a large-sized, thick-walled, heat-resistant, thick-walled magnesium alloy cylindrical component includes a shaping mold, a heat-resistant rubber pad disposed on the inner wall of the shaping mold, an ultrasonic generator 1 and an ultrasonic generator 2 disposed on both sides of the shaping mold, a press disposed above the shaping mold, the press comprising a press slider and a body, the press slider being slidably disposed within the thick-walled magnesium alloy cylindrical component, and a solid particulate medium disposed within the thick-walled magnesium alloy cylindrical component.

[0019] A cavity is provided between the orthopedic mold and the thick-walled magnesium alloy cylindrical part, and a solid particle medium is provided in the cavity. A heat-resistant rubber pad is also attached to the outer surface of the thick-walled magnesium alloy cylindrical part.

[0020] An iris mechanism is provided above the orthopedic mold, and the thick-walled magnesium alloy cylindrical component is located inside the iris mechanism. The iris mechanism is connected to the lifting mechanism.

[0021] The iris recognition mechanism includes five cam plates arranged in a circular array around a center point, a drive shaft connected to one corner end of the cam plates, and a power mechanism connected to the drive shaft. The five drive shafts pass vertically through the annular plate.

[0022] The outer surface of the cam plate is an arc surface, the center of the arc surface is located at the center point, and the two ends of the arc surface are respectively provided with a concave arc surface and a convex arc surface. The center of the convex arc surface is located at the center of the drive shaft, and the center of the concave arc surface is located at the center of the drive shaft of the adjacent cam plate.

[0023] The concave and convex surfaces of two adjacent cam plates are in contact with each other.

[0024] The power mechanism includes a gear disposed at the top of the drive shaft, a synchronous belt connected to the five gears, and a motor connected to one of the drive shafts, the motor being disposed on the annular plate.

[0025] The lifting mechanism can be a lifting cylinder, which is connected to the annular plate via a support column.

[0026] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0027] (1) This invention is a precision straightening technology for thick-walled magnesium alloy cylindrical parts. It adopts a straightening process that combines solid particle medium with rigid mold. The solid particle medium has good fluidity, but it is not easy to produce the sealing difficulties similar to liquid medium. The presence of ultrasonic waves makes the solid graphite particles disperse evenly inside the cylindrical part, ensuring the dimensional accuracy and uniform wall thickness distribution of the straightened thick-walled magnesium alloy cylindrical part.

[0028] (2) This invention is a precision straightening process for difficult-to-deform metal cylindrical parts. Existing straightening techniques are generally suitable for straightening at room temperature, but are difficult to apply to metal materials such as magnesium alloys, which have extremely poor plasticity at room temperature. Therefore, this invention utilizes the heat transfer characteristics of solid particulate media to set the entire straightening process at a high temperature, which can better avoid phenomena such as cracking caused by the poor plasticity of thick-walled magnesium alloy cylindrical parts;

[0029] (3) This solution incorporates an iris recognition mechanism, achieving the following two technical effects:

[0030] First, by placing the thick-walled magnesium alloy cylindrical component between five cam plates and using the five cam plates to hold the thick-walled magnesium alloy cylindrical component, it is easier to measure the outer diameter of the magnesium alloy cylindrical component and prevent its outer diameter from becoming too large.

[0031] Secondly, five cam plates are set above the cavity. By adjusting the lifting cylinder, they can be pressed above the solid particle medium according to the actual situation. Due to the deformation of the thick-walled magnesium alloy cylindrical part, the solid particle medium in the cavity will be squeezed, which will cause the solid particle medium to rise. Under the limit of the cam plate, it can be prevented from rising, thereby indirectly preventing the continued deformation of the thick-walled magnesium alloy cylindrical part after the straightening work is completed.

[0032] (4) Setting solid particle media between the straightening mold and the magnesium alloy cylindrical part is used when the straightening mold is large and the magnesium alloy cylindrical part is small.

[0033] In addition, both the inner and outer sides of the magnesium alloy cylindrical component are solid particulate media. Under the constraint of the solid particulate media on the outside of the magnesium alloy cylindrical component, excessive deformation of the magnesium alloy cylindrical component is avoided, and the deformation of the magnesium alloy cylindrical component is more uniform.

[0034] Finally, this prevented cracking of the magnesium alloy cylindrical parts and protected the orthopedic mold. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the deformation of the thick-walled magnesium alloy cylindrical part in Embodiments 1 and 2 of the present invention.

[0036] Figure 2 The diagram shows the working process of orthopedics in Embodiments 1 and 2 of the present invention.

[0037] Figure 3 This is a schematic diagram of the connection structure of the iris mechanism in Embodiment 3 of the present invention.

[0038] The attached figures are labeled as follows: 1. Orthopedic mold; 2. Press slide block; 3-1. Ultrasonic generator one; 3-2. Ultrasonic generator two; 4. Thick-walled magnesium alloy cylindrical part; 5. Solid particulate medium; 6. Heat-resistant rubber pad; 7. Cam plate; 71. Drive shaft; 8. Annular plate; 9. Support column; 10. Lifting cylinder; 11. Synchronous belt. Detailed Implementation

[0039] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0040] Example 1

[0041] See Figures 1-2 A method and apparatus for straightening thick-walled magnesium alloy cylindrical parts with solid particle media, comprising the following steps:

[0042] Step S1: Place the ZM6 thick-walled magnesium alloy cylindrical part 4 with a diameter of 180mm and a wall thickness of 8mm into the straightening mold 1;

[0043] Step S2: Place a layer of high-temperature resistant rubber, namely heat-resistant rubber pad 6, inside the thick-walled magnesium alloy cylindrical part 4;

[0044] Step S3: Place solid graphite particles (solid particle medium 5) inside the thick-walled magnesium alloy cylindrical part 4;

[0045] Step S4: Heat the thick-walled magnesium alloy cylindrical part 4 to 350℃ using a heating fixture and hold for 10 hours;

[0046] Step S5: Turn on the ultrasonic generator, including ultrasonic generator 1 3-1 and ultrasonic generator 2 3-2;

[0047] Step S6: Turn on the press to reach a pressure of 8MPa and hold the pressure for 5 minutes;

[0048] Step S7: Turn off the heating fixture, turn off the ultrasonic generator, and release the pressure;

[0049] Step S8: Remove the properly shaped thick-walled magnesium alloy cylindrical part 4 and clean the shaped thick-walled magnesium alloy cylindrical part 4.

[0050] Example 2

[0051] See Figures 1-2 A method and apparatus for straightening thick-walled magnesium alloy cylindrical parts with solid particle media, comprising the following steps:

[0052] Step S1: Place the ZM6 thick-walled magnesium alloy cylindrical part 4 with a diameter of 500mm and a wall thickness of 8mm into the straightening mold 1.

[0053] Step S2: Place a layer of high-temperature resistant rubber, namely heat-resistant rubber pad 6, inside the thick-walled magnesium alloy cylindrical part 4;

[0054] Step S3: Place solid graphite particles (solid particle medium 5) inside the thick-walled magnesium alloy cylindrical part 4;

[0055] Step S4: Heat the cylindrical part to 350℃ using a heating fixture and hold for 12 hours;

[0056] Step S5: Turn on the ultrasonic generator;

[0057] Step S6: Turn on the press to reach a pressure of 10MPa and hold the pressure for 5 minutes;

[0058] Step S7: Turn off the heating fixture, turn off the ultrasonic generator, and release the pressure.

[0059] Step S8: Remove the properly shaped thick-walled magnesium alloy cylindrical part 4 and clean the shaped thick-walled magnesium alloy cylindrical part 4.

[0060] Example 3

[0061] See Figure 2 A cavity is provided between the orthopedic mold 1 and the thick-walled magnesium alloy cylindrical part 4. Solid particle medium is provided in the cavity. The solid particle medium in the cavity is not subjected to external force. A heat-resistant rubber pad 6 is also attached to the outer side of the thick-walled magnesium alloy cylindrical part 4.

[0062] Example 4

[0063] See Figure 3A shaping device for a large-sized, thick-walled, heat-resistant, thick-walled magnesium alloy cylindrical part includes a shaping mold 1, a heat-resistant rubber pad 6 disposed on the inner wall of the shaping mold 1, an ultrasonic generator 3-1 and an ultrasonic generator 3-2 disposed on both sides of the shaping mold 1, a press disposed above the shaping mold 1, the press comprising a press slider 2 and a body, the press slider 2 being slidably disposed up and down in the thick-walled magnesium alloy cylindrical part 4, and a solid particulate medium 5 disposed inside the thick-walled magnesium alloy cylindrical part 4.

[0064] An iris mechanism is provided above the orthopedic mold 1, and a thick-walled magnesium alloy cylindrical part 4 is located inside the iris mechanism. The iris mechanism is connected to the lifting mechanism.

[0065] The iris recognition mechanism includes five cam plates 7 arranged in a circular array around the center point, a drive shaft 71 connected to one corner end of the cam plates 7, and a power mechanism connected to the drive shaft 71. The five drive shafts 71 are perpendicularly inserted through the annular plate 8.

[0066] The outer surface of the cam plate 7 is an arc surface, with the center of the arc surface located at the center point. The two ends of the arc surface are respectively provided with a concave arc surface and a convex arc surface. The center of the convex arc surface is located at the center of the drive shaft, and the center of the concave arc surface is located at the center of the drive shaft of the adjacent cam plate 7.

[0067] The concave and convex arc surfaces of two adjacent cam plates 7 are in contact with each other.

[0068] The power mechanism includes a gear located at the top of the drive shaft 71, a synchronous belt 11 connected to five gears, and a motor connected to one of the drive shafts 71. The motor is mounted on the annular plate 8.

[0069] The lifting mechanism can be a lifting cylinder 10, which is connected to the annular plate 8 via a support column 9.

[0070] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A straightening device for a large-sized, thick-walled, heat-resistant, thick-walled magnesium alloy cylindrical component, characterized in that, The device includes an orthopedic mold, a heat-resistant rubber pad disposed on the inner wall of the orthopedic mold, and an ultrasonic generator 1 and an ultrasonic generator 2 disposed on both sides of the orthopedic mold. A press is disposed above the orthopedic mold. The press includes a press slider and a body. The press slider is disposed vertically within the thick-walled magnesium alloy cylindrical component. Solid particulate media is disposed within the thick-walled magnesium alloy cylindrical component. The solid particulate media is graphite or BN particles. An iris mechanism is provided above the orthopedic mold, and the thick-walled magnesium alloy cylindrical component is located inside the iris mechanism. The iris mechanism is connected to the lifting mechanism. The iris recognition mechanism includes five cam plates arranged in a circular array around a center point, a drive shaft connected to one corner end of the cam plates, and a power mechanism connected to the drive shaft. The five drive shafts pass vertically through the annular plate. The outer surface of the cam plate is an arc surface, the center of the arc surface is located at the center point, and the two ends of the arc surface are respectively provided with a concave arc surface and a convex arc surface. The center of the convex arc surface is located at the center of the drive shaft, and the center of the concave arc surface is located at the center of the drive shaft of the adjacent cam plate. The concave and convex arc surfaces of two adjacent cam plates are in contact with each other; The power mechanism includes a gear disposed at the top of the drive shaft, a synchronous belt connected to the five gears, and a motor connected to one of the drive shafts, the motor being disposed on the annular plate.

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