Rocker arm shaft closed forging tool

Abstract

The invention discloses a closed forging tool for a rocker arm shaft, and belongs to the field of forging. A rocker arm shaft closed type forging tool comprises an upper die base used for being installed on a moving part of a lifting mechanism and further comprises a lower die base fixed to the ground, the upper die base and the lower die base are coaxially arranged, a punch is fixedly installed on the lower portion of the upper die base, a circulating cooling assembly is arranged between the upper die base and the lower die base, and the upper die base and the lower die base are coaxially arranged. When the upper die base descends for forging and pressing, the circulating cooling assembly cools the upper die base and the lower die base. The upper die base is installed on the moving part of the lifting mechanism, centering is conducted through the fixed lower die base, precise positioning of a workpiece in the forging process is guaranteed through the coaxially-arranged dies, deviation or bending is avoided, in addition, the punch on the lower portion of the upper die base and the forming cavity of the lower die base are matched for forging and pressing operation, closed forging is achieved, and the forging efficiency is improved. The closed design avoids the problems of material loss and inaccurate deformation control in open forging.

Description

Technical Field

[0001] The invention relates to the technical field of forging, and in particular to a closed forging tool for a rocker arm shaft. Background Art

[0002] Rocker shafts are widely used in automobile steering systems to transmit steering force and realize steering functions. Their main function is to transmit the driver's steering input to various components in the steering system, ensuring the sensitivity and accuracy of steering and ensuring driving safety.

[0003] The forging of rocker arm shafts is an important process for producing high-strength steering arm shafts. Forging can improve the internal structure of the material and enhance the strength, wear resistance and fatigue resistance of the parts. During the forging process, high-temperature plastic deformation is used to make the metal structure denser and eliminate casting defects, thereby improving the impact resistance, stability and durability of the steering arm shaft, ensuring the high quality and long life of the product, and adapting to the high-load working requirements of the automobile steering system.

[0004] However, there are some problems with traditional technology: Due to its length and structural characteristics, the extra-long rocker arm shaft faces many difficulties in forging and subsequent trimming. First, the extra-long shaft is prone to uneven heating during the forging process, resulting in uneven stress distribution in the forging, which may cause cracks or deformation. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that it is difficult to forge and trim an ultra-long rocker shaft using general equipment, and to propose a closed forging tool for a rocker shaft.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A closed forging tool for a rocker arm shaft includes an upper die base for installation on a moving part of a lifting mechanism, and also includes a lower die base fixed on the ground, wherein the upper die base and the lower die base are coaxially arranged, wherein a punch is fixedly installed on the lower part of the upper die base, wherein a circulating cooling component is provided between the upper die base and the lower die base, and the circulating cooling component cools the upper die base and the lower die base when the upper die base is lowered for forging.

[0008] To achieve the stamping action, preferably, a forming cavity for placing the substrate and cooperating with the punch for stamping is opened on the upper part of the lower die seat, and the punch is movably inserted into the forming cavity of the lower die seat to squeeze the substrate to perform closed forging action on the rocker shaft.

[0009] In order to achieve docking with the lifting mechanism, the upper mold base further includes a first upper splicing plate, a lifting plate is fixedly installed on the upper part of the first upper splicing plate, and a docking hole for cooperating with the moving part of the lifting mechanism is opened inside the lifting plate.

[0010] In order to realize the limited installation of the punch, further, a second upper splicing disk is fixedly installed inside the first upper splicing disk, and the upper part of the punch contacts the second upper splicing disk.

[0011] In order to realize the limited installation of the punch, further, a first upper limit tube is fixedly installed on the lower part of the first upper splicing plate, and the upper part of the first upper limit tube is in contact with the lower part of the punch body.

[0012] To realize a modular upper mold base, further, a second upper limit positioning tube is fixedly installed outside the first upper splicing plate and the first upper limit positioning tube, and the second upper limit positioning tube is sleeved outside the first upper splicing plate and the first upper limit positioning tube.

[0013] In order to realize a modular lower die base and after forging is completed, the substrate is ejected by a ejector rod. Further, the lower die base includes a lower splicing plate, the lower part of the lower splicing plate is fixedly connected to a base plate fixed on the ground, the upper part of the lower splicing plate is plugged and fixedly installed with a first lower splicing tube, the upper part of the first lower splicing tube is fixedly installed with a second lower splicing tube, a core block is limitedly installed between the second lower splicing tube and the first lower splicing tube, the upper part of the second lower splicing tube is fixedly installed with a third lower splicing tube, the molding cavity is opened on the upper part of the third lower splicing tube, the second lower splicing tube, the third lower splicing tube and the core block are slidably installed with the same linkage column at the center position, and a ejector rod is slidably installed inside the lower splicing plate, and the upper part of the ejector rod is connected to the lower part of the linkage column.

[0014] In order to realize the limit fixation of modular installation, further, a first lower limit tube is fixedly installed on the upper part of the base plate, a second lower limit tube is fixedly installed on the upper part of the first lower limit tube, the first lower limit tube sleeve is arranged on the outside of the first lower splicing tube, and the second lower limit tube sleeve is arranged on the outside of the second lower splicing tube and the third lower splicing tube.

[0015] To achieve a water-cooling circulation effect, further, the circulating cooling component includes a diverter pipe, an upper water inlet seat for connecting a water source is provided on one side of the first upper splicing plate, the upper part of the diverter pipe is fixedly mounted on the second upper splicing plate, the first water inlet hole of the diverter pipe passes through the flow channel of the second upper splicing plate and is connected with the upper water inlet seat, a plurality of first water outlet holes are provided at the lower part of the diverter pipe, the diverter pipe body is plugged and installed on the upper part of the punch, and the first water outlet hole of the diverter pipe is connected with the internal flow channel of the punch for cooling medium transmission, an upper water outlet seat is also fixedly mounted on the outside of the first upper splicing plate, and the internal flow channel of the punch passes through the first upper splicing plate and is connected with the upper water outlet seat.

[0016] In order to realize integrated circulation cooling of the upper mold base and the lower mold base, further, a lower water inlet seat is fixedly installed on the upper part of the second lower limit tube, and the lower water inlet seat is connected and penetrated with the upper water outlet seat through a transmission pipe, and a spiral groove is opened inside the second lower limit tube, and the spiral groove of the second lower limit tube cooperates with the third lower splicing tube to form a spiral transmission channel, the input end of the spiral transmission channel passes through the second lower limit tube and is communicated with the lower water inlet seat, and the end of the spiral transmission channel is communicated with the secondary cooling member connecting pipe, the secondary cooling member is fixed on the upper part of the second lower limit tube, and the secondary cooling member includes an upper ring body, a plurality of transmission plates are fixedly connected to the lower part of the upper ring body, and a lower ring body is fixedly connected to the lower part of the transmission plate, and a second water inlet hole is opened on the upper ring body and is communicated with the end of the spiral transmission channel, and a lower water outlet seat for connecting to a return water pipeline is also fixedly installed on the lower part of the second lower limit tube, and the lower ring body is opened with a second water outlet hole, and the second water outlet hole passes through the second lower limit tube and is communicated with the lower water outlet seat.

[0017] Compared with the prior art, the present invention provides a rocker arm shaft closed forging tooling, which has the following beneficial effects:

[0018] 1. The closed forging tooling of the rocker arm shaft effectively solves the problem caused by uneven temperature distribution during the forging process of the ultra-long rocker arm shaft by adopting a closed forging process and an efficient circulating cooling system. The uniform cooling water flow ensures the stable control of the mold temperature and avoids mold deformation, cracks or forging defects caused by overheating or insufficient local cooling. This temperature control management not only improves the stability and durability of the mold, but also ensures the shape and dimensional accuracy of the forging during the production process. Especially for the ultra-long and complex rocker arm shaft, the precise cooling effectively manages the thermal stress generated during the forging process and avoids warping, deformation and uneven internal stress caused by excessive temperature difference. Through this temperature control system, the parts produced are more in line with the design requirements, the generation of defective products is reduced, the production efficiency and product reliability are improved, and the rework and scrap rates are reduced;

[0019] 2. The closed forging tooling of the rocker arm shaft can significantly reduce the heat damage and wear of the mold during high-temperature forging through a precise circulating cooling system, and extend the service life of the mold. The circulating cooling system uses a multi-channel design to ensure that the mold surface is continuously cooled, and the design of the spiral groove and the transmission plate greatly improves the cooling effect, avoiding local overheating. The mold will not fail due to overheating or material fatigue during long-term high-intensity work, thereby reducing the replacement frequency and maintenance cost of the mold. Since the stability of the mold is guaranteed, the downtime during the production process is greatly reduced, which enables enterprises to improve the efficiency of the production line and reduce the overall maintenance expenses. In addition, the modular design of the cooling system makes maintenance more convenient. When the equipment fails, only the relevant components need to be replaced or repaired, rather than the entire system, thereby reducing the production downtime;

[0020] 3. The closed forging tooling of the rocker arm shaft can not only ensure the high quality of the forging process through the circulating cooling system, but also effectively improve the production efficiency. By reasonably designing the cooling path and water flow, the cooling process is more efficient and avoids unnecessary waste of cooling water. The spiral flow of water in the mold greatly improves the heat exchange efficiency, so that each part of the mold can be cooled in time and evenly, thereby speeding up the production cycle. The accuracy of temperature control means that the time of each forging can be more accurately controlled, reducing the waiting time for cooling and improving the operating efficiency of the overall production line. In addition, the cooling effect of the system improves the durability of the mold and reduces production interruptions caused by overheating damage or thermal expansion. This energy-saving and efficient cooling method not only improves production capacity, but also reduces energy consumption, and ultimately helps the company achieve the goals of sustainable development and cost savings.

[0021] The parts not involved in the device are the same as the existing technology or can be implemented by existing technology. The closed forging process of the present invention solves the problems of uneven heating and uneven internal stress distribution during the forging process of ultra-long rocker arm shafts through uniform cooling and precise temperature control, reduces cracks and deformation, and ensures the shape accuracy and structural integrity of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a closed forging tool for a rocker shaft proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of the overall exploded structure of a rocker arm shaft closed forging tooling proposed by the present invention;

[0024] Figure 3 This is a schematic diagram of the overall cross-sectional structure of a closed forging tooling for a rocker shaft proposed by the present invention;

[0025] Figure 4This is a schematic diagram of the structure of a circulating cooling assembly of a rocker shaft closed forging tooling proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a lower die base of a rocker arm shaft closed forging tooling proposed by the present invention;

[0027] Figure 6 A schematic diagram of the upper die seat structure of a rocker arm shaft closed forging tooling proposed by the present invention;

[0028] Figure 7 This is a schematic diagram of the secondary cooling part structure of a rocker shaft closed forging tooling proposed by the present invention.

[0029] In the figure: 1. Circulation cooling assembly; 2. Upper die base; 3. Punch; 4. Lower die base; 5. Base plate; 6. Lifting plate; 7. Base material; 8. Docking hole; 9. Ejector rod;

[0030] 101, shunt pipe; 102, transmission pipe; 103, spiral transmission channel; 104, secondary cooling element;

[0031] 1011, first water inlet; 1012, first water outlet;

[0032] 1041, upper ring body; 1042, second water inlet hole; 1043, transmission plate; 1044, lower ring body; 1045, second water outlet hole;

[0033] 201, first upper splicing plate; 202, second upper splicing plate; 203, first upper limit pipe; 204, second upper limit pipe; 205, upper water inlet seat; 206, upper water outlet seat;

[0034] 401, lower joint plate; 402, first lower limit tube; 403, first lower joint tube; 404, linkage column; 405, core block; 406, second lower joint tube; 407, third lower joint tube; 408, second lower limit tube; 409, lower water inlet seat; 410, lower water outlet seat. DETAILED DESCRIPTION

[0035] 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.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Example:

[0038] Reference Figure 1 - Figure 7 A closed forging tool for a rocker arm shaft includes an upper die base 2 for installation on a moving part of a lifting mechanism, and also includes a lower die base 4 fixed on the ground. The upper die base 2 and the lower die base 4 are coaxially arranged, wherein a punch 3 is fixedly installed at the lower part of the upper die base 2, wherein a circulating cooling component 1 is provided between the upper die base 2 and the lower die base 4, and the circulating cooling component 1 cools the upper die base 2 and the lower die base 4 when the upper die base 2 is lowered for forging.

[0039] The above-mentioned closed forging tooling for the rocker arm shaft overcomes the problems of uneven heating, uneven internal stress distribution and difficulty in ensuring trimming accuracy that are easily encountered during forging of an extra-long rocker arm shaft through the design and coordinated operation of the upper die base 2 and the lower die base 4.

[0040] Specifically, the upper die base 2 is installed in the moving part of the lifting mechanism and is aligned by the fixed lower die base 4. The coaxially arranged molds ensure the precise positioning of the workpiece during the forging process to avoid deviation or bending. In addition, the punch 3 at the bottom of the upper die base 2 cooperates with the forming cavity of the lower die base 4 to perform forging operations, thereby realizing closed forging. The closed design avoids the problems of material loss and inaccurate deformation control in open forging. At the same time, the upper die base 2 and the lower die base 4 are cooled in real time through the circulating cooling component 1, thereby solving the problem of uneven internal stress distribution caused by uneven heating of ultra-long shafts during forging. The application of the cooling system significantly reduces the influence of mold overheating on material strength and precision, thereby improving the forging quality and mold life.

[0041] To achieve the punching action, preferably, a forming cavity for placing the substrate 7 and cooperating with the punch 3 for punching is provided on the upper part of the lower die seat 4, and the punch 3 is movably inserted into the forming cavity of the lower die seat 4 to extrude the substrate 7 to perform the closed forging action of the rocker arm shaft. To achieve docking with the lifting mechanism, the upper die seat 2 further includes a first upper splicing plate 201, and a lifting plate 6 is fixedly installed on the upper part of the first upper splicing plate 201, and a docking hole 8 is provided inside the lifting plate 6 for cooperating with the moving part of the lifting mechanism.

[0042] In closed forging, a forming cavity is provided on the upper part of the lower die seat 4 for placing the substrate 7. The punch 3 precisely cooperates with the forming cavity through lifting and lowering movements to complete the forging action. When the punch 3 is inserted into the forming cavity, the substrate 7 in the cavity is forced to fill the cavity shape of the mold under high pressure to achieve precision forming. This design ensures uniform material flow of the workpiece during the forming process, avoids the problem of excessive material flash in traditional forging, and ensures the dimensional accuracy of complex structural parts. The existence of the forming cavity also enhances the overall constraint of the shaft during the forging process, further reducing the bending and deformation problems caused by excessive length. In addition, since the closed movement of the punch 3 and the forming cavity creates a closed environment, the temperature distribution during the forging process is more uniform, avoiding local overheating or overcooling, thereby improving the internal organizational properties of the forging.

[0043] To achieve the limited installation of the punch 3, further, a second upper splicing disc 202 is fixedly installed inside the first upper splicing disc 201, and the upper part of the punch 3 contacts the second upper splicing disc 202. To achieve the limited installation of the punch 3, further, a first upper limit positioning tube 203 is fixedly installed at the lower part of the first upper splicing disc 201, and the upper part of the first upper limit positioning tube 203 contacts the lower part of the main body of the punch 3. To achieve the modular upper die seat 2, further, a second upper limit positioning tube 204 is fixedly installed outside the first upper splicing disc 201 and the first upper limit positioning tube 203, and the second upper limit positioning tube 204 is sleeved outside the first upper splicing disc 201 and the first upper limit positioning tube 203.

[0044] High-precision installation and flexible adjustment are achieved through the docking of the splicing disk and the lifting mechanism. The first upper splicing disk 201 is fixed on the moving part of the lifting mechanism, ensuring the stability and controllability of the entire mold system during forging. In order to achieve the limited installation of the punch 3, a second upper splicing disk 202 is provided in the first upper splicing disk 201, and a first upper limit positioning tube 203 is added to its lower part to ensure that the punch 3 maintains the linearity of axial movement during forging. The second upper limit positioning tube 204 is sleeved on the outside of the first upper splicing disk 201 and the first upper limit positioning tube 203, providing additional structural support and impact resistance for the upper mold base 2. The advantage of modular design is that when the mold is worn or needs to be replaced, only the damaged parts need to be replaced without changing the entire upper mold base 2 structure, which greatly reduces the maintenance cost and downtime.

[0045] At the same time, the splicing design of the upper die base 2 effectively alleviates the dimensional error during processing and installation, and enhances the adaptability of the equipment.

[0046] In order to realize the modular lower die base 4, and after the forging is completed, the substrate 7 is ejected by the ejector rod 9. Further, the lower die base 4 includes a lower splicing plate 401, the lower part of the lower splicing plate 401 is fixedly connected to the base plate 5 fixed on the ground, the upper part of the lower splicing plate 401 is plugged and fixedly installed with a first lower splicing tube 403, the upper part of the first lower splicing tube 403 is fixedly installed with a second lower splicing tube 406, a core block 405 is limitedly installed between the second lower splicing tube 406 and the first lower splicing tube 403, a third lower splicing tube 407 is fixedly installed on the upper part of the second lower splicing tube 406, a molding cavity is opened at the upper part of the third lower splicing tube 407, the second lower splicing tube 406, the third lower splicing tube 407 and the core block 405 are slidably installed with the same linkage column 404 at the center position, and a ejector rod 9 is slidably installed inside the lower splicing plate 401, and the upper part of the ejector rod 9 is connected to the lower part of the linkage column 404. In order to realize the limit fixation of the modular installation of the lower mold base 4, further, a first lower limit tube 402 is fixedly installed on the upper part of the base plate 5, and a second lower limit tube 408 is fixedly installed on the upper part of the first lower limit tube 402. The first lower limit tube 402 is sleeved on the outside of the first lower splicing tube 403, and the second lower limit tube 408 is sleeved on the outside of the second lower splicing tube 406 and the third lower splicing tube 407.

[0047] The lower die base 4 adopts a modular splicing structure design, including a plurality of splicing tubes and limiting tubes, forming a forging system with high adaptability.

[0048] After the forging of the substrate 7 is completed, the substrate 7 is ejected by the ejector rod 9 arranged in the lower die base 4, thereby completing the demolding operation of the workpiece. Specifically, the ejector rod 9 is slidably installed in the lower splicing plate 401, and its upper end is connected to the linkage column 404. When the forging is completed, the ejector rod 9 moves upward under the push of the linkage column 404, and ejects the workpiece from the forming cavity, avoiding the damage or deformation of the workpiece that may be caused by traditional manual removal. The modular design also allows the lower die base 4 to quickly adjust the size of the forming cavity according to the rocker shafts of different sizes and specifications, thereby improving the flexibility and efficiency of production. In addition, the limit design between the splicing tubes ensures the structural stability of the lower die base 4 during high-pressure forging, and avoids the misalignment or looseness that may be caused by multi-section splicing.

[0049] To achieve a water-cooling circulation effect, further, the circulating cooling component 1 includes a diverter pipe 101, an upper water inlet seat 205 for connecting a water source is provided on one side of the first upper splicing plate 201, the upper part of the diverter pipe 101 is fixedly mounted on the second upper splicing plate 202, the first water inlet hole 1011 of the diverter pipe 101 passes through the flow channel of the second upper splicing plate 202 and is connected with the upper water inlet seat 205, a plurality of first water outlet holes 1012 are provided at the lower part of the diverter pipe 101, the main body of the diverter pipe 101 is plugged and installed on the upper part of the punch 3, and the first water outlet holes 1012 of the diverter pipe 101 are connected with the internal flow channel of the punch 3 for cooling medium transmission, an upper water outlet seat 206 is also fixedly mounted on the outside of the first upper splicing plate 201, and the internal flow channel of the punch 3 passes through the first upper splicing plate 201 and is connected with the upper water outlet seat 206.

[0050] One side of the upper die base 2 is provided with an upper water inlet seat 205, which is directly connected to an external water source. The cooling water enters the shunt pipe 101 through the water inlet pipe. The design of the shunt pipe 101 in the upper die base 2 allows the water flow to be distributed to multiple cooling channels along the predetermined flow channel, ensuring that the cooling water can flow evenly into various parts of the mold. After the water flows into the internal flow channel of the punch 3, it passes through multiple precisely arranged water outlet holes, and the cooling water can cover every area where the punch 3 contacts the mold. This design ensures that the high-temperature area of ​​the upper die base 2 is continuously cooled, preventing temperature accumulation, thereby avoiding thermal expansion or deformation of the mold.

[0051] Specifically, the cooling water transfers heat through the flow channel inside the punch 3, and the setting of the flow channel helps to quickly conduct heat from the punch 3, thereby avoiding excessive heat damage caused by high temperature. The cooling system ensures uniform temperature distribution by precisely controlling the cooling water flow and cooling time, and prevents the situation where the temperature of one part is too high while the temperature of other parts is low.

[0052] In order to realize the integrated circulation cooling of the upper die seat 2 and the lower die seat 4, further, a lower water inlet seat 409 is fixedly installed on the upper part of the second lower limit tube 408, and the lower water inlet seat 409 is connected and connected with the upper water outlet seat 206 through the transmission pipe 102. A spiral groove is opened inside the second lower limit tube 408, and the spiral groove of the second lower limit tube 408 cooperates with the third lower splicing tube 407 to form a spiral transmission channel 103. The input end of the spiral transmission channel 103 passes through the second lower limit tube 408 and is connected with the lower water inlet seat 409. The end of the spiral transmission channel 103 is connected with the connecting pipe of the secondary cooling member 104, and the secondary cooling member 10 The secondary cooling member 104 is fixed on the upper part of the second lower stop tube 408, and includes an upper ring body 1041, a plurality of transmission plates 1043 are fixedly connected to the lower part of the upper ring body 1041, a lower ring body 1044 is fixedly connected to the lower part of the transmission plate 1043, the upper ring body 1041 is provided with a second water inlet hole 1042 which is communicated with the end of the spiral transmission channel 103, a lower water outlet seat 410 for connecting to the return water pipeline is also fixedly installed at the lower part of the second lower stop tube 408, and a second water outlet hole 1045 is provided in the lower ring body 1044, and the second water outlet hole 1045 passes through the second lower stop tube 408 and communicates with the lower water outlet seat 410.

[0053] When the cooling water flows out from the upper die base 2, the water flows into the lower die base 4. A spiral groove is designed inside the lower die base 4. The spiral groove provides a longer flow path for the cooling water. By increasing the contact time of the water flow in the mold, the cooling effect is improved.

[0054] The cooling water first enters the spiral groove of the second lower limit pipe 408 through the lower water inlet seat 409, and the water flows in the spiral groove and absorbs the heat in the mold. The function of the spiral groove is to increase the flow time of the cooling water, so that the cooling water can fully take away the heat when cooling the mold, thereby improving the cooling efficiency. This channel design not only helps to uniformly control the surface temperature of the mold, but also avoids the problem of uneven cooling caused by direct impact of the water flow.

[0055] After passing through the spiral groove, the cooling water flows into the secondary cooling part 104, which includes an upper ring body 1041 and a lower ring body 1044. A plurality of transmission plates 1043 are fixed between the ring bodies. The function of the transmission plates 1043 is to further promote the heat exchange between the cooling water and the mold and improve the cooling effect. The cooling water is finally discharged from the system through the lower water outlet seat 410, and the heat is recovered and discharged to the external cooling system through the pipeline.

[0056] The design of the circulating cooling system can not only effectively control the mold temperature, but also improve the overall stability of the mold and the forging quality in a larger range.

[0057] Through precise cooling, the mold temperature is always kept within the optimal range, avoiding premature melting of the material or mold damage due to overheating. It also reduces thermal stress caused by excessive temperature differences, thereby reducing the risk of part deformation.

[0058] In the present invention, the upper die base 2 is installed in the moving part of the lifting mechanism and is aligned by the fixed lower die base 4. The coaxially arranged dies ensure the precise positioning of the workpiece during the forging process to avoid deviation or bending. In addition, the punch 3 at the bottom of the upper die base 2 cooperates with the forming cavity of the lower die base 4 to perform forging operations, thereby realizing closed forging. The closed design avoids the problems of material loss and inaccurate deformation control in open forging. At the same time, the upper die base 2 and the lower die base 4 are cooled in real time by the circulating cooling component 1, thereby solving the problem of uneven internal stress distribution caused by uneven heating of ultra-long shafts during forging. The application of the cooling system significantly reduces the influence of die overheating on material strength and precision, thereby improving the forging quality and die life.

[0059] The above description is only a preferred specific implementation manner 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 scheme and inventive concept 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 closed forging tool for a rocker arm shaft, comprising an upper die seat (2) for mounting on a moving part of a lifting mechanism, characterized in that: It also includes a lower die base (4) fixed on the ground, wherein the upper die base (2) and the lower die base (4) are coaxially arranged. Wherein, a punch (3) is fixedly mounted on the lower part of the upper die base (2). Wherein, a circulating cooling component (1) is provided between the upper die base (2) and the lower die base (4), and the circulating cooling component (1) cools down the upper die base (2) and the lower die base (4) when the upper die base (2) is lowered for forging.

2. A rocker arm shaft closed forging tool according to claim 1, characterized in that: The upper part of the lower die seat (4) is provided with a forming cavity for placing a base material (7) and cooperating with a punch (3) for stamping. The punch (3) is movably inserted into the forming cavity of the lower die seat (4) to squeeze the base material (7) to perform a closed forging action on the rocker arm shaft.

3. A rocker arm shaft closed forging tool as claimed in claim 2, characterized in that: The upper die seat (2) comprises a first upper splicing plate (201), a lifting plate (6) is fixedly mounted on the upper part of the first upper splicing plate (201), and a docking hole (8) is provided inside the lifting plate (6) for cooperating with the moving part of the lifting mechanism.

4. A rocker arm shaft closed forging tool as claimed in claim 3, characterized in that: A second upper splicing disk (202) is fixedly mounted inside the first upper splicing disk (201), and the upper portion of the punch (3) is in contact with the second upper splicing disk (202).

5. The closed forging tool for a rocker arm shaft according to claim 3, characterized in that: A first upper limit tube (203) is fixedly mounted on the lower portion of the first upper splicing plate (201), and the upper portion of the first upper limit tube (203) is in contact with the lower portion of the punch (3) body.

6. A rocker arm shaft closed forging tool as claimed in claim 5, characterized in that: A second upper limit tube (204) is fixedly mounted outside the first upper splicing plate (201) and the first upper limit tube (203), and the second upper limit tube (204) is sleeved outside the first upper splicing plate (201) and the first upper limit tube (203).

7. The closed forging tool for a rocker arm shaft according to claim 4, characterized in that: The lower die base (4) comprises a lower splicing plate (401), the lower portion of the lower splicing plate (401) is fixedly connected to a base plate (5) fixed on the ground, the upper portion of the lower splicing plate (401) is plugged and fixedly installed with a first lower splicing tube (403), the upper portion of the first lower splicing tube (403) is fixedly installed with a second lower splicing tube (406), a core block (405) is limitedly installed between the second lower splicing tube (406) and the first lower splicing tube (403), A third lower splicing tube (407) is fixedly installed on the upper part of the second lower splicing tube (406), and the molding cavity is opened on the upper part of the third lower splicing tube (407). The second lower splicing tube (406), the third lower splicing tube (407) and the core block (405) are slidably installed with the same linkage column (404) at the center position. A ejecting rod (9) is slidably installed inside the lower splicing plate (401), and the upper part of the ejecting rod (9) is connected to the lower part of the linkage column (404).

8. The closed forging tool for a rocker arm shaft according to claim 7, characterized in that: A first lower position limiting tube (402) is fixedly mounted on the upper part of the base plate (5), a second lower position limiting tube (408) is fixedly mounted on the upper part of the first lower position limiting tube (402), the first lower position limiting tube (402) is sleeved on the outside of the first lower splicing tube (403), and the second lower position limiting tube (408) is sleeved on the outside of the second lower splicing tube (406) and the third lower splicing tube (407).

9. A closed forging tool for a rocker arm shaft according to claim 8, characterized in that: The circulating cooling component (1) comprises a shunt pipe (101), an upper water inlet seat (205) for connecting to a water source is provided on one side of the first upper splicing plate (201), the upper portion of the shunt pipe (101) is fixedly mounted on the second upper splicing plate (202), a first water inlet hole (1011) of the shunt pipe (101) passes through a flow channel of the second upper splicing plate (202) and is connected to the upper water inlet seat (205), and a lower portion of the shunt pipe (101) is provided with a A plurality of first water outlet holes (1012), the main body of the shunt pipe (101) is plugged and installed on the upper part of the punch (3), and the first water outlet holes (1012) of the shunt pipe (101) are connected with the internal flow channel of the punch (3) to perform cooling medium transmission. An upper water outlet seat (206) is also fixedly installed on the outside of the first upper splicing plate (201), and the internal flow channel of the punch (3) passes through the first upper splicing plate (201) and is connected and connected with the upper water outlet seat (206).

10. A closed forging tool for a rocker arm shaft according to claim 9, characterized in that: A lower water inlet seat (409) is fixedly installed on the upper part of the second lower limit tube (408), and the lower water inlet seat (409) is connected and connected with the upper water outlet seat (206) through a transmission pipe (102). A spiral groove is provided inside the second lower limit tube (408), and the spiral groove of the second lower limit tube (408) cooperates with the third lower splicing tube (407) to form a spiral transmission channel (103). The input end of the spiral transmission channel (103) passes through the second lower limit tube (408) and is connected with the lower water inlet seat (409). The end of the spiral transmission channel (103) is connected with the connecting pipe of the secondary cooling member (104), and the secondary cooling member (104) is fixed on the second lower limit tube (408). 8) upper part, and the secondary cooling member (104) comprises an upper ring body (1041), the lower part of the upper ring body (1041) is fixedly connected to a plurality of transmission plates (1043), the lower part of the transmission plate (1043) is fixedly connected to a lower ring body (1044), the upper ring body (1041) is provided with a second water inlet hole (1042) which is in communication with the end of the spiral transmission channel (103), the lower part of the second lower limit tube (408) is also fixedly installed with a lower water outlet seat (410) for connecting to a return water pipeline, the lower ring body (1044) is provided with a second water outlet hole (1045), and the second water outlet hole (1045) passes through the second lower limit tube (408) and is in communication with the lower water outlet seat (410).

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