A large cast steel part with high toughness and low residual stress and a vibration aging treatment method thereof
By employing a combination structure of triangular brackets and excitation convex rods in the vibration aging treatment of large cast steel parts, combined with a flexible traction system of hydraulic rods and vibration isolation seats, the problem of uneven stress treatment in cast steel parts in the prior art has been solved, achieving efficient and uniform stress reduction effect and improving the strength, toughness and dimensional stability of cast steel parts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 山东润金重工科技有限公司
- Filing Date
- 2026-04-01
- Publication Date
- 2026-06-23
AI Technical Summary
Existing vibration aging devices and processes suffer from poor support stability, low excitation force transmission efficiency, lack of precise displacement guiding structures and real-time monitoring modules in the treatment of large cast steel parts, resulting in uneven stress treatment and difficulty in meeting the requirements of high strength, toughness and low residual stress.
By employing a triangular bracket structure in conjunction with a vibration-enhancing protrusion, and combining a flexible traction system with hydraulic rods and vibration isolation seats, precise displacement and stable resonance of the casting are achieved. Microscopic plastic deformation is induced by the superposition of excitation force and residual stress, and the effective area is expanded by using stress reduction plates. Parameter control is achieved in conjunction with a real-time monitoring display screen.
It achieves rapid and stable resonance in cast steel parts, improves the efficiency and uniformity of residual stress elimination, ensures the high strength and toughness and dimensional accuracy of castings, and adapts to the automated processing of large cast steel parts.
Smart Images
Figure CN122256644A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of casting treatment technology, and more specifically, to a high-strength, high-toughness, low-residual-stress large cast steel part and its vibration aging treatment method. Background Technology
[0002] Large cast steel components with high strength, toughness, and low residual stress are core foundational components in heavy machinery, energy and power, shipbuilding and marine engineering, and high-end equipment manufacturing. They not only require materials to possess a balance of high strength and high toughness, but also face stringent requirements regarding internal residual stress levels, dimensional stability, fatigue life, and service safety. During the entire process of solidification and cooling, solid-state phase transformation, heat treatment, and machining, cast steel components inevitably generate significant internal stresses due to factors such as uneven temperature fields, uneven microstructure transformation, and external force constraints.
[0003] Excessive residual stress can directly reduce the effective load-bearing capacity of components, induce stress corrosion cracking, and easily lead to problems such as warping, loss of dimensional accuracy, and brittle fracture during long-term storage, machining, or service, seriously affecting product qualification rate and safety. Therefore, residual stress elimination and homogenization treatment in the later stages of casting steel component manufacturing is a key process to ensure product quality.
[0004] Vibration aging is currently the mainstream process for stress relief in metal components. It induces resonance in the component through vibration, utilizing the superposition of alternating stress and residual stress to induce microscopic plastic deformation, thereby achieving stress reduction and redistribution. However, existing vibration aging devices and processes have significant drawbacks: First, large cast steel parts have poor support stability and are prone to displacement during vibration, leading to uneven stress treatment; second, the excitation force transmission efficiency is low, making it impossible to quickly bring the casting into a stable resonance state; third, there is a lack of precise displacement guidance and automated traction structures, making clamping, displacement, and unloading of large castings difficult; fourth, there is no real-time monitoring module, making processing parameters invisible and stress reduction effects difficult to control precisely. These problems prevent traditional vibration aging from meeting the requirements of efficient, uniform, stable, and controllable stress relief for large cast steel parts, thus hindering the large-scale production and performance improvement of high-strength, high-toughness, low-residual-stress cast steel parts. Summary of the Invention
[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a large cast steel part with high strength and toughness and low residual stress and a vibration aging treatment method thereof, aiming to solve the problems mentioned in the background art.
[0006] The present invention provides the following technical solution: a vibration aging treatment method for large cast steel parts with high strength and toughness and low residual stress, including a base for support, wherein a treatment component is provided on the base; The processing component includes a bracket disposed on the top of the base. The vertical cross-sectional shape of the bracket is triangular, and a guide cavity is provided on the bracket for guiding the casting to reduce stress along the guide displacement of the guide cavity. The bracket is equipped with a vibration plate for supporting the casting. The vibration plate is provided with several vibration protrusions that are in contact with the casting, so that the casting generates alternating stress in a resonant state when it is displaced. Then, the external alternating stress is superimposed with the residual stress inside the casting. When the yield limit of the material is exceeded in a local area, micro-plastic deformation is induced, causing the lattice of the high-stress area to slip, thereby reducing and redistributing the residual stress.
[0007] Furthermore, a limiting shaft is provided on one side of the top of the base, and a hydraulic rod is hinged on the limiting shaft. A vibration isolation seat is provided at the output end of the hydraulic rod, and a traction rod is hinged at one end of the vibration isolation seat. The traction rod is fixed to one end of the casting and drives the casting to move through the hydraulic rod. A gantry frame is provided on the outer side of the base. The gantry frame is a portal frame structure, and a processor is provided on one side of the bottom of the gantry frame. Furthermore, an extension cover is provided at the bottom of the inner cavity of the gantry frame. The extension cover is installed on the base by bolts. The extension cover is located at one end of the bracket. A display screen for display is provided on one side of the extension cover. The display screen is connected to the processor by wires. A feeding block for lifting the casting is provided at one end of the extension cover. The feeding block is welded and fixed to the extension cover.
[0008] A high-strength, high-toughness, low-residual-stress large cast steel component is applied to the vibration aging treatment method for such components as described above. The method includes a resonant conduction plate welded to the casting for stress transmission, and each of the resonant conduction plates is provided with a plurality of stress-reducing plates for residual stress reduction. The casting is bolted to a traction rod, and the resonant conduction plate is in contact with an excitation protrusion. The technical effects and advantages of this invention are as follows: By directly contacting the excitation protrusion with the resonance conduction plate on the casting, the excitation force is transmitted without loss, quickly bringing the casting into a stable resonance or sub-resonance state; in conjunction with the stress reduction plate, the stress application area is expanded, the lattice slip in the high stress area is accelerated, the residual stress elimination efficiency and homogenization effect are significantly improved, and the high strength and toughness of the casting are effectively guaranteed. The bracket structure with a triangular vertical cross section is rigid and stable, suitable for the heavy load of large cast steel parts; with the built-in guide cavity of the bracket, the displacement of the casting is precisely limited throughout the entire process, avoiding the casting from shifting or shaking during vibration aging, ensuring the uniformity of residual stress reduction, and greatly improving the dimensional accuracy of the casting. The hydraulic rod, together with the limiting shaft, vibration isolation seat and traction rod, forms a flexible traction structure, which can realize the directional and automated displacement of large castings, and block the vibration backlash through the vibration isolation seat to avoid vibration interference with the driving accuracy. The clamping and displacement process is stable and reliable, and it is suitable for the aging treatment of large cast steel parts of different sizes. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signal, etc. involved in the embodiments of this disclosure.
[0010] Figure 1 This is a front view of the overall structure of the present invention.
[0011] Figure 2 This is a side view of the overall structure of the present invention.
[0012] Figure 3 For the present invention Figure 1 Left side structural diagram.
[0013] Figure 4 This is a schematic diagram of the bracket, vibration plate, gantry frame, extension cover, display screen, unloading support block and processor of the present invention.
[0014] Figure 5 This is a schematic diagram of the traction rod, hydraulic rod, limiting shaft, resonance conduction plate, and stress reduction plate of the present invention.
[0015] Figure 6 This is a schematic diagram of the processor, gantry, unloading support block, vibration plate, bracket, base, and vibration protrusion of the present invention.
[0016] The attached diagram is labeled as follows: 1. Casting; 2. Resonance conduction plate; 3. Stress reduction plate; 4. Base; 5. Bracket; 6. Vibration excitation plate; 7. Vibration excitation protrusion; 8. Limiting shaft; 9. Hydraulic rod; 10. Vibration isolation seat; 11. Traction rod; 12. Gantry frame; 13. Processor; 14. Extension cover; 15. Display screen; 16. Unloading support block. Detailed Implementation
[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Example 1
[0018] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3As shown, this embodiment provides a high-strength, high-toughness, low-residual-stress large cast steel part and its vibration aging treatment device. The overall device is supported by a base 4. A treatment component is installed on the top of the base 4, a drive traction component is set on one side of the top of the base 4, a protective control component is covered on the outside of the base 4, and a material unloading component is set at the end of the treatment component. The large cast steel part is adapted to be installed on the treatment component and fixedly connected to the drive traction component. The drive traction component drives the cast steel part to move, and the treatment component is used to achieve vibration aging stress relief treatment.
[0019] Cast steel body structure Combined with appendix Figure 5 As shown, the high-strength, high-toughness, low-residual-stress large cast steel component includes a casting 1 body. Several resonant conduction plates 2 are welded to the outer wall of the casting 1, and these plates are evenly distributed along the length of the casting 1 to efficiently conduct vibration stress. Each resonant conduction plate 2 is integrally formed or welded with multiple stress-reducing plates 3, which are arranged parallel to the resonant conduction plates 2 to expand the stress application area and accelerate the homogenization and reduction of residual stress. The ends of the casting 1 are detachably fixed to the drive traction assembly by bolts, facilitating clamping and disassembly.
[0020] Vibration aging treatment device structure Supporting guide structure combined with attachment Figure 4 Appendix Figure 6 As shown, the base 4 is a rigid base to ensure the overall stability of the device; the bracket 5 is fixedly installed on the top of the base 4. The vertical section of the bracket 5 is a triangular structure. The triangular structure has excellent structural stability, can bear the weight of large cast steel parts and is not easily deformed; the bracket 5 has a guide cavity extending along its length. The guide cavity provides guidance and limit for the displacement of the casting 1, preventing the casting 1 from shifting during the vibration aging process and ensuring the accuracy of the stress reduction operation. Example 2
[0021] Based on Example 1, this example combines the excitation component with the attached... Figure 4 Appendix Figure 6 As shown, a vibration plate 6 is fixedly installed on the top surface of the bracket 5. The vibration plate 6 is attached and fixed to the bracket 5 to ensure stable transmission of the excitation force. Several vibration protrusions 7 are evenly arranged on the vibration plate 6. The top of the vibration protrusions 7 is in close contact with the resonance conduction plate 2 on the casting 1. The vibration protrusions 7 directly transmit the excitation force to the interior of the casting 1, so that the casting 1 quickly enters the resonance or sub-resonance state.
[0022] Drive traction component combined with attachment Figure 5As shown, a limiting shaft 8 is fixedly installed on one side of the top of the base 4. A hydraulic rod 9 is hinged to the limiting shaft 8. The hydraulic rod 9 can be finely adjusted around the limiting shaft 8 to adapt to the displacement trajectory of the casting 1. The output end of the hydraulic rod 9 is fixedly connected to the vibration isolation seat 10. The vibration isolation seat 10 plays a role in vibration isolation and buffering, avoiding the vibration reaction to the hydraulic rod 9 and affecting the driving accuracy. The end of the vibration isolation seat 10 away from the hydraulic rod 9 is hinged to the traction rod 11. The end of the traction rod 11 is fastened to the end of the casting 1 by bolts. When the hydraulic rod 9 extends or retracts, the traction rod 11 drives the casting 1 to make directional displacement along the guide cavity of the bracket 5, realizing the full vibration aging treatment of the casting 1.
[0023] Protection and control components combined with attachments Figure 1 Appendix Figure 4 As shown, a gantry frame 12 is provided on the outer side of the base 4. The gantry frame 12 is a rigid frame in the shape of a portal, which serves as a protective and support function. A processor 13 is installed on one side of the bottom of the gantry frame 12. The processor 13 is the control core of the device, used to regulate vibration parameters, drive parameters and collect and process data. An extension cover 14 is fixed to the bottom of the inner cavity of the gantry frame 12. The extension cover 14 is locked onto the base 4 by bolts and is located at the end of the bracket 5, which protects the bracket 5 and the excitation assembly. A display screen 15 is embedded on the outer side of the extension cover 14. The display screen 15 is electrically connected to the processor 13 by wires to display parameters such as vibration frequency, stress reduction data and processing time in real time, which is convenient for operators to monitor.
[0024] Material cutting components combined with attachment Figure 4 Appendix Figure 6 As shown, the end of the extension cover 14 away from the bracket 5 is welded and fixed with the unloading support block 16. The top surface of the unloading support block 16 is at the same level as the top surface of the excitation protrusion 7. After the vibration aging treatment is completed, the unloading support block 16 supports the casting 1, which facilitates the unloading and transfer of the casting 1 and avoids the casting 1 from being bumped and damaged.
[0025] Vibration aging treatment methods The specific steps of the vibration aging treatment method in this embodiment are as follows: Clamping and positioning: Place the casting 1 on the excitation plate 6 of the bracket 5, make the resonance conduction plate 2 and the excitation protrusion 7 fit tightly together, and fix the traction rod 11 to the end of the casting 1 with bolts to complete the clamping of the casting 1.
[0026] Drive displacement: The processor 13 is started to control the extension and retraction of the hydraulic rod 9. The hydraulic rod 9 drives the casting 1 to make uniform directional displacement along the guide cavity of the bracket 5 through the traction rod 11. During the displacement process, the casting 1 always keeps in contact with the excitation protrusion 7.
[0027] Vibration stress relief: The excitation plate 6 drives the excitation protrusion 7 to generate excitation force, which is transmitted to the interior of the casting 1 through the resonance transmission plate 2, so that the casting 1 is in a resonance state and generates alternating stress; the external alternating stress is superimposed with the residual stress inside the casting 1, and the stress in the local area exceeds the yield limit of the material, inducing micro-plastic deformation, and the lattice slips in the high stress area, thereby reducing and redistributing the residual stress.
[0028] The stress reduction data is monitored in real time via the display screen 15. After the processing is completed, the hydraulic rod 9 is reset, the casting 1 is moved above the unloading block 16, the connection between the traction rod 11 and the casting 1 is disassembled, and the casting 1 is unloaded.
[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for vibration aging treatment of large cast steel parts with high strength, toughness, and low residual stress, comprising a base (4) for support, characterized in that: The base (4) is provided with a processing component; The processing component includes a bracket (5) set on the top of the base (4). The vertical cross-sectional shape of the bracket (5) is set as a triangle, and a guide cavity is provided on the bracket (5) for guiding, so that the casting (1) can be stress-reduced along the guide displacement of the guide cavity. The bracket (5) is provided with a vibration plate (6) for supporting the casting (1). The vibration plate (6) is provided with several vibration protrusions (7) that are in contact with the casting (1) so that the casting (1) generates alternating stress in a resonant state when it is displaced. Then, the external alternating stress is superimposed with the residual stress inside the casting (1), and when the yield limit of the material is exceeded in a local area, micro-plastic deformation is induced, causing the lattice of the high stress area to slip, thereby reducing and redistributing the residual stress.
2. The vibration aging treatment method for large cast steel parts with high strength, toughness, and low residual stress according to claim 1, characterized in that: A limiting shaft (8) is provided on one side of the top of the base (4), and a hydraulic rod (9) is hinged on the limiting shaft (8).
3. The vibration aging treatment method for large cast steel parts with high strength, toughness, and low residual stress according to claim 2, characterized in that: The output end of the hydraulic rod (9) is provided with a vibration isolation seat (10), and one end of the vibration isolation seat (10) is hinged with a traction rod (11). The traction rod (11) is fixed to one end of the casting (1) and driven by the hydraulic rod (9) to move the casting (1) to a certain position.
4. The vibration aging treatment method for large cast steel parts with high strength, toughness, and low residual stress according to claim 3, characterized in that: The base (4) is covered with a gantry frame (12), which is a gantry structure, and a processor (13) is provided on one side of the bottom of the gantry frame (12).
5. The vibration aging treatment method for large cast steel parts with high strength, toughness, and low residual stress according to claim 4, characterized in that: An extension cover (14) is provided at the bottom of the inner cavity of the gantry frame (12). The extension cover (14) is installed on the base (4) by bolts. The extension cover (14) is located at one end of the bracket (5).
6. The vibration aging treatment method for large cast steel parts with high strength, toughness, and low residual stress according to claim 5, characterized in that: The extension cover (14) is provided with a display screen (15) on one side, and the display screen (15) is connected to the processor (13) by a wire.
7. The vibration aging treatment method for large cast steel parts with high strength, toughness, and low residual stress according to claim 6, characterized in that: One end of the extension cover (14) is provided with a feeding block (16) for supporting the casting (1), and the feeding block (16) is welded and fixed to the extension cover (14).
8. A high-strength, high-toughness, low-residual-stress large cast steel component, applied to the vibration aging treatment method for high-strength, high-toughness, low-residual-stress large cast steel components as described sequentially in claims 1-7, characterized in that: The resonant conduction plate (2) is welded onto the casting (1) and used for stress transmission. Each of the resonant conduction plates (2) is provided with a plurality of stress reduction plates (3) for stress reduction. The casting (1) is bolted to the traction rod (11). The resonant conduction plate (2) is in contact with the excitation protrusion (7).