Step-by-step cold pressing device for reducing residual stress of free forge piece
By designing a step-by-step cold pressing device and utilizing the automated control of hydraulic cylinders and heaters, the problem of time-consuming and labor-intensive manual operation during the cold pressing process of forgings was solved, and efficient automated processing and stress release of forgings were achieved.
Patent Information
- Application Number
- CN202423238455.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In the current cold pressing process of forging, manual assistance is required to continuously remove the forging from the mold for heating and forging. This operation is time-consuming and labor-intensive, and multiple cold and heat treatments are required to completely release the stress.
Design a step-by-step cold pressing device to achieve automated cold pressing and heat treatment of forgings through the coordination of adjusting and moving components. Utilize hydraulic cylinders and heaters to achieve automatic movement and temperature control of the forgings, reducing manual operation.
It improves forging processing efficiency, reduces manual operation time, and achieves effective release of internal stress and enhanced stability of forgings.
Smart Images
Figure CN223561620U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of cold pressing equipment, and in particular relates to a step-by-step cold pressing device for reducing residual stress in free forgings. Background Technology
[0002] Cold pressing of forgings is a plastic forming method performed by applying external force below the recrystallization temperature of the metal. Cold pressing is commonly used for the plastic deformation of metallic materials at room temperature to achieve the desired shape or size, or to adjust the microstructure of forgings and release internal stress. During the manufacturing process, forgings often generate internal stress due to the plastic deformation of the metal. To improve the stability and quality of forgings, methods are typically employed to release these internal stresses.
[0003] In current cold pressing processes for forgings, internal stress may be generated in the forgings due to the plastic deformation of the material. Most methods use heat treatment, which involves heating the forgings to a certain temperature and holding it for a certain time to release the internal stress. However, the forgings need to undergo repeated heat treatment to completely release the stress, which requires manual removal of the forgings from the mold for repeated heating and forging. This operation is time-consuming and labor-intensive. To address this issue, we provide a step-by-step cold pressing device to reduce residual stress in free forgings, thereby solving the above problems. Utility Model Content
[0004] The purpose of this invention is to provide a step-by-step cold pressing device for reducing residual stress in free forgings. By coordinating the adjustment component and the moving component, it solves the problem in the prior art that in the cold pressing process of forgings, manual assistance is required to continuously remove the forgings from the mold for heating and forging, which is time-consuming and labor-intensive.
[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.
[0006] This utility model relates to a step-by-step cold pressing device for reducing residual stress in free forgings. It includes a base, a heating box mounted on top of the base, a heater installed inside the heating box, a first hydraulic cylinder on one side of the heating box, a movable column mounted at the output end of the first hydraulic cylinder, a top mold mounted at the bottom of the movable column, and a bottom mold at the bottom of the top mold. An adjustment assembly is provided on the surface of the movable column, the adjustment assembly including a support sleeve movably connected to the surface of the movable column. Support shells are fixedly connected to both sides of the support sleeve, and multiple hydraulic rods are installed inside the support shells. The output ends of the multiple hydraulic rods are fixedly connected to the movable sleeve, and a clamping plate is fixedly connected to the bottom of the movable sleeve through the support shell. A movable component is provided on top of the base, the movable component including a movable plate, the movable plate being disposed on top of the base, a slot being formed on the top of the movable plate, and a second hydraulic cylinder fixedly connected to one side of the movable plate.
[0007] The present invention is further configured such that the adjustment component includes a drive motor, the drive motor is installed on one side of the moving column, the output end of the drive motor is fixedly connected to a first gear, and the surface of the support sleeve is fixedly connected to a second gear.
[0008] The present invention is further configured such that the surface of the movable column is movably connected to the inner wall of the support sleeve via a bearing, and the first gear meshes with the second gear.
[0009] The present invention is further configured such that a crossbeam is fixedly connected to one side of the first hydraulic cylinder, and the other end of the crossbeam is fixedly connected to the heating box.
[0010] The present invention is further configured such that the bottom of the second hydraulic cylinder is fixedly connected to the base, and sealing plates are fixedly connected to both sides of the movable plate.
[0011] The present invention is further configured such that guide rails are slidably connected to both the front and rear sides of the movable plate, and the bottom of the guide rails is fixedly connected to the base.
[0012] The present invention is further configured such that a support rod is slidably connected inside the movable sleeve, and both sides of the support rod are fixedly connected to the inner wall of the support shell.
[0013] The present invention is further configured such that a through groove is provided on the top of the base and a movable groove is provided on one side of the heating box.
[0014] This invention has the following advantages: By adjusting the component settings, the first hydraulic cylinder can drive the top mold to move, and the bottom mold can be used to cold press the forging. After cold pressing, the heater inside the heating box is used to heat the forging. After heating the forging to a certain temperature, it is held for a certain time and then slowly cooled. This heat treatment process improves the crystal structure in the metal, thereby releasing internal stress. At the same time, the multi-stage hydraulic rod drives the clamping plate to move, which can assist the forging to move to the next set of bottom molds for secondary processing. No manual assistance is required, which effectively improves the processing efficiency of the forging. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0016] Figure 1 This is a perspective view of a step-by-step cold pressing device for reducing residual stress in free forgings.
[0017] Figure 2 This is a cross-sectional view of the heating chamber in a step-by-step cold pressing device for reducing residual stress in free forgings.
[0018] Figure 3This is a side view of a partial structure in a step-by-step cold pressing device for reducing residual stress in free forgings.
[0019] Figure 4 This is a partial cross-sectional view of the support shell in a step-by-step cold pressing device for reducing residual stress in free forgings.
[0020] Figure 5 This is a schematic diagram of the movement of the bottom die in a step-by-step cold pressing device for reducing residual stress in free forgings.
[0021] Figure 6 This is a schematic diagram of the movement of a forging in a step-by-step cold pressing device for reducing residual stress in free forgings.
[0022] In the attached diagram: 1. Base; 2. Heating box; 3. Heater; 4. First hydraulic cylinder; 5. Moving column; 6. Top mold; 7. Bottom mold; 8. Support sleeve; 9. Support shell; 10. Multi-stage hydraulic rod; 11. Moving sleeve; 12. Clamping plate; 13. Moving plate; 14. Slot; 15. Second hydraulic cylinder; 16. Drive motor; 17. First gear; 18. Second gear; 19. Cross frame; 20. Sealing plate; 21. Guide rail plate; 22. Support rod. Detailed Implementation
[0023] The technical solutions of the present invention will be described below with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Example
[0024] Please see Figure 1-6 This utility model is a step-by-step cold pressing device for reducing residual stress in free forgings. It includes a base 1, a heating box 2 installed on the top of the base 1, a heater 3 installed inside the heating box 2, a first hydraulic cylinder 4 set on one side of the heating box 2, a moving column 5 installed at the output end of the first hydraulic cylinder 4, a top mold 6 installed at the bottom of the moving column 5, and a bottom mold 7 set at the bottom of the top mold 6. An adjustment component is set on the surface of the moving column 5, the adjustment component includes a support sleeve 8, the support sleeve 8 is movably connected to the surface of the moving column 5, and a support shell 9 is fixedly connected to both sides of the support sleeve 8. A multi-stage hydraulic rod 10 is installed inside the support shell 9, and a moving sleeve 11 is fixedly connected to the output end of the multi-stage hydraulic rod 10. The bottom of the moving sleeve 11 passes through the support shell 9 and is fixedly connected to a clamping plate 12. A moving component is set on the top of the base 1, the moving component includes a moving plate 13, the moving plate 13 is set on the top of the base 1, a slot 14 is opened on the top of the moving plate 13, and a second hydraulic cylinder 15 is fixedly connected to one side of the moving plate 13.
[0025] Specifically: Heater 3 is installed inside heating chamber 2. When the forging is moved into heating chamber 2, it can be heat-treated. During heat treatment, the forging is slowly and uniformly heated from room temperature to about 550°C, held for 4-8 hours, and then cooled down to below 150°C before being taken out of the furnace. This can improve the plasticity and toughness of the metal, improve the crystal structure in the metal, thereby releasing internal stress and making the forging more uniform and stable. Example
[0026] Please see Figure 1-6 Based on Embodiment 1, the adjustment assembly further includes a drive motor 16, which is mounted on one side of the moving column 5. A first gear 17 is fixedly connected to the output end of the drive motor 16, and a second gear 18 is fixedly connected to the surface of the support sleeve 8. The surface of the moving column 5 is movably connected to the inner wall of the support sleeve 8 through a bearing. The first gear 17 and the second gear 18 mesh with each other. A crossbeam 19 is fixedly connected to one side of the first hydraulic cylinder 4, and the other end of the crossbeam 19 is fixedly connected to the heating box 2. The bottom of the second hydraulic cylinder 15 is fixedly connected to the base 1. Sealing plates 20 are fixedly connected to both sides of the moving plate 13. Guide rail plates 21 are slidably connected to the front and rear sides of the moving plate 13. The bottom of the guide rail plates 21 is fixedly connected to the base 1. A support rod 22 is slidably connected inside the moving sleeve 11. Both sides of the support rod 22 are fixedly connected to the inner wall of the support shell 9. A through groove is opened on the top of the base 1, and a moving groove is opened on one side of the heating box 2.
[0027] Specifically: the first hydraulic cylinder 4 is used to drive the top mold 6 to move up and down; the multi-stage hydraulic rod 10 is used to drive the clamping plate 12 to move and clamp the bottom mold 7 and the forging; there are three sets of slots 14 for placing the bottom mold 7; there are two sets of bottom molds 7, one for primary processing and one for secondary processing; the second hydraulic cylinder 15 is used to drive the moving plate 13 to move; the first gear 17 and the second gear 18 mesh to transmit power to the drive motor 16; there are two sealing plates 20 for sealing the heating box 2; a through groove is opened at the top of the base 1 to ensure that the clamping plate 12 can move up and down; the diameter of the moving groove is the same as the diameter of the sealing plate 20 to ensure that the moving plate 13 can be inserted into the heating box 2.
[0028] The working principle of this utility model is as follows: The operator starts the second hydraulic cylinder 15 via an external controller. The second hydraulic cylinder 15 moves the moving plate 13, which aligns the bottom mold 7 and the forging with the top mold 6. Then, the first hydraulic cylinder 4 is started. The first hydraulic cylinder 4, in conjunction with the moving column 5, moves the top mold 6, which, in conjunction with the bottom mold 7, performs cold pressing on the forging. After one cold pressing cycle, the multi-stage hydraulic rod 10 is started. The multi-stage hydraulic rod 10, in conjunction with the moving sleeve 11, moves the clamping plate 12 to clamp the bottom mold 7. The first hydraulic cylinder 4 is then started again to move the bottom mold 7 upwards. Simultaneously, the second hydraulic cylinder 15 is started, in conjunction with the moving plate 13, to move the bottom mold 7 into the slot 14 on the left side. Figure 5 As shown, the second hydraulic cylinder 15 is then activated again to bring the clamping plate 12 into contact with the forging. This process is repeated to clamp the forging again. The first hydraulic cylinder 4, the second hydraulic cylinder 15, and the multi-stage hydraulic rod 10 are controlled to insert the forging into the next set of bottom molds 7. Figure 6 As shown, secondary cold pressing can effectively improve the processing efficiency of forgings.
[0029] After the cold pressing process is completed, the second hydraulic cylinder 15 can be restarted to move the moving plate 13 and the forging into the heating box 2. At the same time, the heater 3 is started to slowly and evenly heat the forging from room temperature to about 550°C. The temperature is held for 4-8 hours, and then the cooling rate is strictly controlled to be below 150°C before the forging is taken out of the furnace. This can improve the plasticity and toughness of the metal, improve the crystal structure in the metal, thereby releasing internal stress and making the forging more uniform and stable.
[0030] All standard parts used in this invention can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through the control unit. The control circuit of the control unit can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Therefore, the control method and circuit connection will not be explained in detail in this invention.
[0031] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.
Claims
1. A step-by-step cold pressing device for reducing the residual stress of a free forging piece, comprising a base (1), characterized in that: A heating box (2) is installed on the top of the base (1), a heater (3) is installed inside the heating box (2), a first hydraulic cylinder (4) is provided on one side of the heating box (2), a moving column (5) is installed at the output end of the first hydraulic cylinder (4), a top mold (6) is installed at the bottom of the moving column (5), and a bottom mold (7) is provided at the bottom of the top mold (6). The surface of the movable column (5) is provided with an adjustment component, which includes a support sleeve (8). The support sleeve (8) is movably connected to the surface of the movable column (5). Support shells (9) are fixedly connected to both sides of the support sleeve (8). Multi-stage hydraulic rods (10) are installed inside the support shells (9). The output end of the multi-stage hydraulic rods (10) is fixedly connected to a movable sleeve (11). The bottom of the movable sleeve (11) passes through the support shells (9) and is fixedly connected to a clamping plate (12). The base (1) is provided with a moving component on the top. The moving component includes a moving plate (13). The moving plate (13) is located on the top of the base (1). A slot (14) is provided on the top of the moving plate (13). A second hydraulic cylinder (15) is fixedly connected to one side of the moving plate (13).
2. The step-by-step cold pressing device for reducing residual stress of free forging pieces according to claim 1, characterized in that: The adjustment assembly also includes a drive motor (16), which is mounted on one side of the moving column (5). The output end of the drive motor (16) is fixedly connected to a first gear (17), and the surface of the support sleeve (8) is fixedly connected to a second gear (18).
3. The apparatus for stepwise cold pressing to reduce residual stress of a free forging according to claim 2, wherein: The surface of the movable column (5) is movably connected to the inner wall of the support sleeve (8) through a bearing, and the first gear (17) meshes with the second gear (18).
4. The apparatus for stepwise cold pressing to reduce residual stress of a free forging according to claim 1, wherein: A crossbeam (19) is fixedly connected to one side of the first hydraulic cylinder (4), and the other end of the crossbeam (19) is fixedly connected to the heating box (2).
5. The apparatus for stepwise cold pressing to reduce residual stress of a free forging according to claim 1, wherein: The bottom of the second hydraulic cylinder (15) is fixedly connected to the base (1), and sealing plates (20) are fixedly connected to both sides of the moving plate (13).
6. The apparatus for stepwise cold pressing to reduce residual stress of a free forging according to claim 1, wherein: The movable plate (13) is slidably connected to the front and rear sides of the guide rail plate (21), and the bottom of the guide rail plate (21) is fixedly connected to the base (1).
7. The apparatus for stepwise cold pressing to reduce residual stress of a free forging according to claim 1, wherein: The movable sleeve (11) is slidably connected to a support rod (22), and both sides of the support rod (22) are fixedly connected to the inner wall of the support shell (9).
8. The apparatus for stepwise cold pressing to reduce residual stress of a free forging according to claim 1, wherein: The base (1) has a through groove on its top, and the heating box (2) has a moving groove on one side.