Gear forge piece die

Abstract

The utility model relates to the field of forge piece dies, and discloses a gear forge piece die which comprises a top plate used for being fixedly installed on the top wall face and a bottom plate used for being attached to the ground, a hydraulic rod is fixedly installed at the bottom of the top plate, and supporting legs are fixedly installed at the four corners of the top of the bottom plate. Mold fixing blocks are fixedly installed at the upper ends of the supporting legs and the lower ends of the hydraulic rods correspondingly, a lower mold and an upper mold which are detachable and replaceable are installed on the corresponding sides of the two mold fixing blocks correspondingly, mold cavities used for forming are formed in the corresponding sides of the lower mold and the upper mold correspondingly, and an exhaust assembly is arranged in the mold cavity of the upper mold; the die fixing block is designed in a concave shape, is matched with the inner wall groove to be in sliding clamping connection with the rectangular protrusion on the die and is fastened through a bolt. By means of the structure, when gears of different specifications need to be produced, the lower die and the upper die can be rapidly and conveniently disassembled and replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of forging die, concretely is a gear forging die. BACKGROUND

[0002] In the field of mechanical manufacturing, gears are a kind of key transmission components, and their quality and precision have a crucial influence on the performance and reliability of the entire mechanical system. In the traditional gear manufacturing process, forging is a commonly used method, because forging can make the gear blank obtain good metal streamline and mechanical properties, and improve the strength and wear resistance of the gear.

[0003] However, the existing gear forging die has many deficiencies. In terms of die structure, the traditional die often adopts a relatively fixed installation method, which is extremely inconvenient for die replacement for forging of gears of different specifications. This not only leads to low production efficiency, but also requires a large amount of manpower and time cost for die adjustment and replacement operation. For example, some old-fashioned dies need to be disassembled and installed with the help of complex tooling fixtures, which is cumbersome and easy to damage the die, affecting the service life and precision of the die, therefore we propose a gear forging die. SUMMARY

[0004] (I) Technical problem solved

[0005] In view of the deficiencies of the prior art, the utility model provides a gear forging die, which solves the above problems.

[0006] (II) Technical scheme

[0007] To achieve the above purposes, the utility model provides the following technical scheme: a gear forging die, comprising a top plate for fixedly installed on a top wall and a bottom plate for abutting a ground, a hydraulic rod is fixedly installed at the bottom of the top plate, support legs are fixedly installed at the top four corners of the bottom plate, die fixing blocks are fixedly installed at the upper end of the support legs and the lower end of the hydraulic rod, a lower die and an upper die which can be disassembled and replaced are respectively installed on the side corresponding to each other of the two die fixing blocks, a die cavity for forming is respectively formed on the side corresponding to each other of the lower die and the upper die, and an exhaust assembly is arranged in the die cavity of the upper die.

[0008] Preferably, the cross section of the die fixing block is concave, an inner wall groove is formed on the inner wall of the die fixing block, rectangular protrusions are integrally formed on the two sides of the lower die and the upper die, the rectangular protrusions are slidingly connected in the inner wall groove, bolts are threadedly connected to the die fixing block, and the end of the bolt extending into the inner wall groove is threadedly connected with the protrusion in the inner wall groove.

[0009] Preferably, the lower mold has a locating pin integrally formed on its surface, and the bottom of the upper mold has a circular insertion hole corresponding to the locating pin position.

[0010] Preferably, both the lower mold fixing block and the lower mold have circular openings. A telescopic motor is fixedly installed on the bottom plate, and the position of the telescopic motor corresponds to the position of the circular opening. A demolding top block is fixedly installed on the output shaft of the telescopic motor, and the side of the demolding top block is in contact with the inner wall of the circular opening on the lower mold.

[0011] Preferably, the upper mold has a horizontally opened vent hole, and the two sides of the vent hole penetrate the two side walls of the upper mold respectively, and the venting component is connected to the vent hole.

[0012] Preferably, the venting assembly includes a spring, a push rod, a conical block, and a circular extension block. A top groove is formed above the venting hole inside the upper mold. A shrinkage cavity is formed between the venting hole and the mold cavity of the upper mold. The side of the shrinkage cavity corresponding to the venting hole has an inner wall diameter that gradually decreases downwards. A spring is fixedly installed inside the top groove. A push rod is fixedly installed at the lower end of the spring, and the lower end of the push rod extends into the shrinkage cavity. A conical block is fixedly installed at the end of the push rod inside the shrinkage cavity. The side slope of the conical block is conical. A circular extension block is fixedly installed at the lower end of the push rod, and the circular extension block extends to the outside of the shrinkage cavity. When the spring rebounds normally, the conical slope of the conical block fits against the conical inner wall of the shrinkage cavity, maintaining a sealed state.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, the present invention provides a gear forging mold, which has the following advantages:

[0015] 1. This gear forging mold features a U-shaped mold fixing block that slides and engages with a rectangular protrusion on the mold via an inner wall groove and is secured with bolts. This structure allows for quick and easy disassembly and replacement of the lower and upper molds when producing gears of different specifications. Compared to the complex and time-consuming replacement methods of traditional molds, this significantly shortens mold replacement time, improves the utilization rate and production efficiency of production equipment, reduces downtime costs caused by mold replacement, and also reduces the risk of mold damage, thus extending the overall service life of the mold.

[0016] 2. In this gear forging mold, the locating pin of the lower mold and the circular insertion hole at the bottom of the upper mold precisely engage during mold closing, effectively preventing misalignment between the upper and lower molds during the closing process. This ensures the precision and consistency of the gear forgings during the forming process, improves product quality stability, and reduces the scrap rate caused by mold misalignment. This is of great significance for producing gear products with high precision requirements and can meet the stringent precision requirements of industries such as automotive transmissions and aerospace.

[0017] 3. This gear forging die features a unique venting assembly design inside the upper die, including a spring, ejector rod, conical block, shrinkage cavity, and a collaborative working mechanism with the venting holes. During the forging process, it can automatically adjust the venting timing and volume according to changes in the die cavity pressure. When the pressure inside the die cavity increases, the venting assembly promptly opens the channel, allowing gas to smoothly exit through the shrinkage cavity and venting holes, effectively preventing gas residue inside the forging from forming defects such as porosity or looseness. This not only improves the internal quality and mechanical properties of the gear forging, making it denser and more reliable, but also helps to enhance the stability and repeatability of the entire forging process, providing a strong guarantee for producing high-quality gear forgings.

[0018] 4. This gear forging mold features a telescopic motor mounted on the bottom plate, which works in conjunction with the mold fixing block, the circular opening on the lower mold, and the demolding top block to form a highly efficient demolding mechanism. After the workpiece is formed, the telescopic motor starts, and the demolding top block smoothly ejects the workpiece from the lower mold cavity through the circular opening. This demolding method provides uniform and precisely controllable demolding force, avoiding the deformation or damage to forgings caused by uneven demolding force in traditional demolding methods, thus improving the success rate of demolding and the yield of finished products. Simultaneously, the automated demolding process reduces manual intervention, lowers the labor intensity of workers, improves production safety and efficiency, and further optimizes the entire gear forging production process.

[0019] 5. This gear forging mold features a highly collaborative and tightly integrated system where all components work together seamlessly, forming a complete and efficient production system from mold installation and forging to venting and demolding. Its rational structural design allows it to adapt to the production needs of gears of different specifications. While improving product quality, it significantly enhances production efficiency, reduces production costs, and strengthens the company's competitiveness in the gear manufacturing market. This contributes to driving the entire gear forging industry towards greater efficiency and precision. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the bottom view of this utility model;

[0022] Figure 3 This is a side view of the present invention;

[0023] Figure 4 for Figure 3 AA section view diagram;

[0024] Figure 5 for Figure 4 A magnified view of part B in the diagram.

[0025] In the diagram: 1. Top plate; 2. Hydraulic rod; 3. Mold fixing block; 4. Inner wall groove; 5. Lower mold; 6. Protrusion; 7. Positioning pin; 8. Bolt; 9. Support leg; 10. Telescopic motor; 11. Bottom plate; 12. Upper mold; 13. Circular opening; 14. Demolding top block; 15. Vent hole; 16. Top groove; 17. Spring; 18. Ejector rod; 19. Shrinkage hole; 20. Conical block; 21. Circular extension block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-5 A gear forging mold includes a top plate 1 for fixed installation on a top wall and a bottom plate 11 for contact with the ground. A hydraulic rod 2 is fixedly installed at the bottom of the top plate 1. Support legs 9 are fixedly installed at the four corners of the top of the bottom plate 11. Mold fixing blocks 3 are fixedly installed at the upper end of the support legs 9 and the lower end of the hydraulic rod 2. A detachable and replaceable lower mold 5 and upper mold 12 are respectively installed on one side of the two mold fixing blocks 3. Mold cavities for forming are respectively opened on one side of the lower mold 5 and the upper mold 12. An exhaust component is provided inside the mold cavity of the upper mold 12. When the gear needs to be forged, the heated metal raw material is placed inside the mold cavity of the lower mold 5. Then the hydraulic rod 2 is activated, which drives the mold fixing blocks 3 to move downward. Then the upper mold 12 fits into the lower mold 5, and the mold cavity closes to form the gear. During the forming process, the exhaust component exhausts the gas. After the forming is completed, the hydraulic rod 2 is activated to retract upward, and the lower mold 5 separates from the upper mold 12.

[0028] Furthermore, the cross-section of the mold fixing block 3 is U-shaped, and an inner wall groove 4 is provided on the inner wall of the mold fixing block 3. Both sides of the lower mold 5 and the upper mold 12 are integrally formed with rectangular protrusions. The rectangular protrusions are slidably engaged in the interior of the inner wall groove 4. The mold fixing block 3 is threaded with bolts 8. One end of the bolts 8 extends into the interior of the inner wall groove 4 and is threadedly connected to the protrusions 6 located inside the inner wall groove 4. When it is necessary to forge gears of different specifications, the bolts 8 are removed, and then the lower mold 5 and the upper mold 12 are slid laterally to be removed. Then, the new lower mold 5 and the upper mold 12 are reinstalled and the bolts are used to connect the new lower mold 5 and the upper mold 12.

[0029] Furthermore, the lower mold 5 has a locating pin 7 integrally formed on its surface, and the bottom of the upper mold 12 has a circular insertion hole corresponding to the locating pin 7. When the upper mold 12 and the lower mold 5 are fitted together, the locating pin 7 will be inserted into the circular insertion hole, which can ensure that the two are not easily misaligned when they are fitted together.

[0030] Furthermore, both the lower mold fixing block 3 and the lower mold 5 have circular openings 13. A telescopic motor 10 is fixedly installed on the bottom plate 11, and the position of the telescopic motor 10 corresponds to the position of the circular opening 13. A demolding top block 14 is fixedly installed on the output shaft of the telescopic motor 10. The side of the demolding top block 14 is in contact with the inner wall of the circular opening 13 on the lower mold 5. When the telescopic motor 10 is not started, the surface of the demolding top block 14 is flush with the bottom inner wall of the mold cavity on the lower mold 5. After the workpiece inside the mold cavity is formed, the telescopic motor 10 is started, the output shaft moves upward, and then the demolding top block 14 moves upward to push out the workpiece inside the mold cavity, which facilitates demolding.

[0031] Furthermore, the upper mold 12 has a horizontally opened vent hole 15, and the two sides of the vent hole 15 penetrate through the two side walls of the upper mold 12 respectively, and the venting component is connected to the vent hole 15.

[0032] Furthermore, the venting assembly includes a spring 17, a push rod 18, a conical block 20, and a circular extension block 21. A top groove 16 is formed inside the upper mold 12 above the vent hole 15. A shrinkage cavity 19 is formed between the vent hole 15 and the mold cavity of the upper mold 12. The side of the shrinkage cavity 19 corresponding to the vent hole 15 is a constricted shape with its inner wall diameter gradually decreasing downwards. A spring 17 is fixedly installed inside the top groove 16. A push rod 18 is fixedly installed at the lower end of the spring 17. The lower end of the push rod 18 extends into the shrinkage cavity 19. A conical block 20 is fixedly installed at one end of the push rod 18 inside the shrinkage cavity 19. The side slope of the conical block 20 is conical. A circular extension block 21 is fixedly installed at the lower end of the mold. The circular extension block 21 extends to the outside of the shrinkage cavity 19. When the spring 17 rebounds normally, the conical inclined surface of the conical block 20 fits against the conical inner wall of the shrinkage cavity 19 and remains sealed. During molding, the unformed workpiece inside the mold cavity will press the circular extension block 21 upward. Then the spring 17 contracts, and the conical block 20 moves upward. When the spring 17 reaches its maximum contraction, the circular extension block 21 is flush with the inner wall of the mold cavity of the upper mold 12. There is a gap between the conical block 20 and the inner wall of the shrinkage cavity 19, and the gas enters the vent hole 15 through the shrinkage cavity 19 and is discharged.

[0033] Structural Description:

[0034] Top plate 1: Used for fixed installation on the top wall, providing top support and fixed foundation for the entire mold device. Hydraulic rod 2 is installed at its bottom, which is the mounting carrier of the power source that drives the opening and closing action of the mold.

[0035] Hydraulic rod 2: Installed at the bottom of top plate 1, it drives the mold fixing block 3 connected to it to move up and down through its own telescopic movement, thereby realizing the closing and separation of upper mold 12 and lower mold 5. It is the direct executor of mold opening and closing action and plays a key power transmission role in the forging process.

[0036] Mold fixing block 3:

[0037] The cross-section is U-shaped, and its special shape design provides suitable space and positioning basis for the installation of the lower mold 5 and the upper mold 12.

[0038] An inner wall groove 4 is provided on the inner wall to cooperate with the rectangular protrusions on both sides of the lower mold 5 and the upper mold 12, so that the mold can be installed in the mold fixing block 3 by sliding snap-fit, ensuring the stability and accuracy of mold installation, and facilitating mold disassembly and replacement.

[0039] The bolt 8 is threadedly connected to the mold installed in the groove 4 on its inner wall, which can further fix the mold and prevent it from shifting or loosening during the forging process.

[0040] Inner wall groove 4: It is formed on the inner wall of the mold fixing block 3 and is long and narrow. Its shape matches the rectangular protrusions on both sides of the lower mold 5 and the upper mold 12. Through the sliding and snapping cooperation between the two, the mold is installed and positioned in the mold fixing block 3, ensuring the positional accuracy and stability of the mold during the working process.

[0041] Lower mold 5:

[0042] It has a mold cavity for forming gears, which is the main cavity for forming metal raw materials during the forging process. Its shape is adapted to the shape of the gear to be forged. By closing with the mold cavity of the upper mold 12, the metal raw material is deformed by internal pressure, and finally forms a gear forging.

[0043] The two sides are integrally formed with rectangular protrusions, which slide and engage with the inner wall groove 4 of the mold fixing block 3 to realize the installation and positioning of the mold, and at the same time facilitate the disassembly and replacement of the mold to meet the forging requirements of gears of different specifications.

[0044] The surface is integrally molded with positioning pins 7. When it is fitted with the upper mold 12, the positioning pins 7 are inserted into the corresponding circular insertion holes at the bottom of the upper mold 12, which can effectively prevent misalignment of the upper and lower molds during the mold closing process and ensure molding accuracy.

[0045] Both the mold fixing block 3 below and the mold fixing block 3 are provided with circular openings 13, which cooperate with the telescopic motor 10 and the demolding top block 14 to facilitate the ejection of the workpiece from the mold cavity after the workpiece is formed.

[0046] Protrusion 6: Located on the rectangular protrusions on both sides of the lower mold 5 and the upper mold 12. After the mold is installed in the inner wall groove 4 of the mold fixing block 3, one end of the bolt 8 extends into the inner wall groove 4 and is threadedly connected to the protrusion 6, thereby fastening the mold to the mold fixing block 3 and enhancing the firmness and stability of the mold installation.

[0047] Positioning pin 7: integrally formed on the surface of the lower mold 5, in the shape of a cylinder, its position corresponding to the circular insertion hole at the bottom of the upper mold 12. When the molds are closed, the positioning pin 7 is accurately inserted into the circular insertion hole, playing a positioning and guiding role, ensuring that the upper and lower molds are precisely aligned during the closing process, and avoiding deviations or defects in the formed gear forgings due to mold misalignment.

[0048] Bolt 8: Threaded connection to the mold fixing block 3, one end of which extends into the inner wall groove 4 and is threadedly connected to the protrusion 6 on the mold. During mold installation, tightening bolt 8 securely fixes the lower mold 5 and the upper mold 12 within the mold fixing block 3, preventing displacement or loosening of the mold due to impact or other factors during forging. When it is necessary to change to a different specification mold, loosening bolt 8 allows the mold to be removed from the mold fixing block 3.

[0049] Support leg 9: Fixedly installed at the top four corners of the bottom plate 11, extending upward and connected to the mold fixing block 3. It mainly serves to support the entire mold device, bear the mold, workpiece and various forces generated during the forging process, ensure the stability and safety of the mold during operation, and provide a stable and reliable support platform for forging operations.

[0050] Telescopic motor 10: Fixedly mounted on the bottom plate 11, its position corresponds to the circular opening 13 on the lower mold 5 and the lower mold fixing block 3. After the workpiece is formed, the telescopic motor 10 is started, and its output axis moves upward, driving the demolding ejector block 14 to move upward. Through the cooperation of the demolding ejector block 14 and the circular opening 13, the formed workpiece located inside the mold cavity of the lower mold 5 is ejected, realizing the demolding operation, which facilitates the subsequent workpiece removal and mold cleaning.

[0051] Bottom plate 11: Placed close to the ground, it provides a bottom support base for the entire mold device. Support legs 9 are fixed on its top and provide installation positions for components such as telescopic motor 10. Together with top plate 1, they form the overall frame structure of the mold device, ensuring the stability and reliability of the mold during operation.

[0052] Upper mold 12:

[0053] A forming cavity is provided on one side corresponding to the lower mold 5. Together with the mold cavity of the lower mold 5, it applies pressure to the metal raw material when the mold is closed, so that it is formed into a gear forging.

[0054] A circular insertion hole is provided at the bottom corresponding to the positioning pin 7 of the lower mold 5. During the mold closing process, the positioning pin 7 and the circular insertion hole are engaged to ensure the precise alignment of the upper and lower molds, prevent misalignment, and ensure molding accuracy.

[0055] The internal structure includes a venting assembly, such as a top groove 16, a spring 17, a push rod 18, a shrinkage cavity 19, a conical block 20, and a circular extension block 21, which is used to vent the gas in the mold cavity during the forging process. This prevents defects such as porosity in the formed gear forging due to gas residue and ensures the quality of the forging.

[0056] A vent hole 15 is provided horizontally. The two sides of the vent hole 15 penetrate through the two side walls of the upper mold 12 and are connected to the venting assembly, providing a channel for the gas in the mold cavity to be discharged, so that the gas can be smoothly discharged to the outside of the mold.

[0057] Circular opening 13: Circular openings are respectively formed on the lower mold fixing block 3 and the lower mold 5. The diameter of the opening is adapted to the demolding top block 14, and the side of the demolding top block 14 is in close contact with the inner wall of the circular opening 13 on the lower mold 5. When the telescopic motor 10 is not started, the surface of the demolding top block 14 is flush with the bottom inner wall of the mold cavity on the lower mold 5, which does not affect the normal mold closing and forging operation. After the workpiece is formed, the telescopic motor 10 is started, and the demolding top block 14 can move smoothly upward through the circular opening 13 to push the workpiece out of the mold cavity, realizing the demolding function.

[0058] Demolding ejector block 14: Fixedly mounted on the output shaft of the telescopic motor 10, it is cylindrical or has a shape adapted to the circular opening 13. Its side is in close contact with the inner wall of the circular opening 13 on the lower mold 5 to ensure that the workpiece can be stably ejected upwards during the demolding process, avoiding shaking or displacement that could damage the workpiece or result in incomplete demolding. Driven by the telescopic motor 10, the demolding ejector block 14 moves up and down within the circular opening 13, realizing the demolding operation of ejecting the formed workpiece from the mold cavity of the lower mold 5.

[0059] Vent 15: A transverse vent is formed on the upper mold 12, penetrating both sides of the upper mold 12 and connected to the venting assembly inside the upper mold 12, providing a channel for gas to escape from the mold cavity. During the forging process, the gas inside the mold cavity is discharged to the outside of the mold through the vent 15 under the action of the venting assembly, thereby ensuring stable gas pressure inside the mold cavity, avoiding the impact of residual gas on the forming quality of the gear forging, and ensuring that the internal structure of the forging is dense and free of defects such as porosity.

[0060] Top groove 16: Formed inside the upper mold 12 above the vent hole 15, it is a groove-shaped space used to install the spring 17. Its shape is adapted to the shape of the spring 17, providing a stable installation position for the spring 17, so that the spring 17 can move normally within the top groove 16, thereby driving the connected push rod 18 and related vent components to move, realizing the control and adjustment of the venting function.

[0061] Spring 17: Installed inside the top groove 16, with its upper end fixed to the top of the top groove 16 and its lower end fixedly connected to the ejector rod 18. During the forging process, spring 17 expands and contracts according to the pressure of the workpiece on the circular extension block 21 in the mold cavity. When the pressure in the mold cavity is low, spring 17 maintains its normal rebound state, causing the conical block 20 to close the shrinkage cavity 19 and prevent gas leakage. When the pressure in the mold cavity increases and the workpiece presses upward against the circular extension block 21, spring 17 contracts, causing the conical block 20 to move upward, opening the channel between the shrinkage cavity 19 and the vent hole 15, allowing gas to be discharged. This plays a role in controlling the timing and amount of venting, ensuring the stability and reliability of the mold venting process.

[0062] Ejector rod 18: Its upper end is fixedly connected to the lower end of spring 17, and its lower end extends into the cavity 19. A conical block 20 is fixedly installed at one end of ejector rod 18 located inside the cavity 19, and a circular extension block 21 is also fixedly installed at the lower end. Under the action of spring 17, ejector rod 18 can move up and down, thereby driving the conical block 20 and the circular extension block 21 to move, realizing the opening and closing control of the cavity 19 and the triggering and adjustment of the venting process. When the workpiece in the mold cavity squeezes the circular extension block 21, ejector rod 18 moves upward, driving the conical block 20 to disengage from the inner wall of the cavity 19, allowing gas to enter the venting hole 15 through the cavity 19 and be discharged. When the pressure disappears, spring 17 rebounds, ejector rod 18 resets, and conical block 20 re-closes the cavity 19.

[0063] Shrinkage cavity 19: Located between the vent hole 15 of the upper mold 12 and the mold cavity, the side corresponding to the vent hole 15 has a narrowed inner wall diameter that gradually decreases downwards. This special shape design, in conjunction with the conical block 20, allows the conical inclined surface of the conical block 20 to tightly fit the conical inner wall of the shrinkage cavity 19 when the spring 17 is in normal rebound, achieving a good sealing effect and preventing gas leakage. When the spring 17 contracts and the conical block 20 moves upward, a gap is formed between the shrinkage cavity 19 and the conical block 20, allowing gas to enter the vent hole 15 through this gap and be discharged. This effectively controls and discharges the gas in the mold cavity, ensuring the smooth progress of the forging process and the quality of the forging.

[0064] Conical block 20: Fixedly installed at one end of the push rod 18 inside the shrinkage cavity 19, its side slope is conical, matching the conical inner wall of the shrinkage cavity 19. Under the action of spring 17, the conical block 20 can move up and down within the shrinkage cavity 19. Through its contact and separation with the inner wall of the shrinkage cavity 19, it controls the opening and closing of the channel of the shrinkage cavity 19, thereby controlling the discharge of gas in the mold cavity. When spring 17 rebounds normally, the conical block 20 closes the shrinkage cavity 19; when spring 17 contracts, the conical block 20 moves upward a certain distance, and the gas can enter the vent hole 15 through the gap between it and the inner wall of the shrinkage cavity 19 and be discharged, ensuring that the gas in the mold cavity can be discharged in a timely and orderly manner during the forging process, avoiding the impact of gas residue on the quality of the gear forging.

[0065] Circular extension block 21: Fixedly installed at the lower end of the push rod 18, extending to the outside of the shrinkage hole 19, located inside the cavity of the upper mold 12. During the forging process, the unformed workpiece inside the cavity will press upwards against the circular extension block 21, thereby triggering the spring 17 to contract, driving the entire venting assembly to operate and achieve the venting function. When the spring 17 reaches its maximum contraction, the circular extension block 21 remains flush with the inner wall of the upper mold 12 cavity. At this time, there is a gap between the conical block 20 and the inner wall of the shrinkage hole 19, allowing gas to smoothly pass through the shrinkage hole 19 and enter the venting hole 15 for discharge. Its position and shape are reasonably designed, effectively sensing pressure changes inside the cavity and transmitting them to the venting assembly, ensuring the normal operation of the venting process.

[0066] Working principle: When gears need to be forged, the heated metal raw material is placed inside the cavity of the lower mold 5. Then, the hydraulic rod 2 is activated, which drives the mold fixing block 3 to move downward. Then, the upper mold 12 fits into the lower mold 5, and the mold cavity closes to form the gear. During the forming process, the venting component vents the gas. After the forming is completed, the hydraulic rod 2 is activated to retract upward, and the lower mold 5 separates from the upper mold 12.

[0067] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gear forging die characterized by, The utility model provides a mould fixing block (3) is fixedly installed on the bottom of hydraulic rod (2) and the upper end of support leg (9) of bottom plate (11) four corner, and the upper end of support leg (9) and the lower end of hydraulic rod (2) are fixedly installed with mould fixing block (3), and the side of two mould fixing blocks (3) corresponds respectively and is installed with the lower mould (5) and upper mould (12) of detachable replacement, and the side of lower mould (5) and upper mould (12) corresponds respectively and is provided with the mould cavity for forming, and the mould cavity inside upper mould (12) is provided with exhaust component.

2. A gear forging die according to claim 1, wherein: The cross section of the mould fixing block (3) is concave, and an inner wall groove (4) is formed on the inner wall of the mould fixing block (3). The two sides of the lower mould (5) and the upper mould (12) are integrally formed with a rectangular protrusion. The rectangular protrusion is slidingly connected in the inner wall groove (4). The mould fixing block (3) is threadedly connected with a bolt (8). One end of the bolt (8) extending into the inner wall groove (4) is threadedly connected with the protrusion (6) in the inner wall groove (4).

3. A gear forging die as defined in claim 1, wherein: The surface of the lower mould (5) is integrally formed with a positioning pin (7). The bottom of the upper mould (12) is provided with a circular insertion hole corresponding to the position of the positioning pin (7).

4. A gear forging die as defined in claim 1, wherein: Circular openings (13) are formed on the lower mould fixing block (3) and the lower mould (5). The bottom plate (11) is fixedly installed with a telescopic motor (10). The position of the telescopic motor (10) corresponds to the position of the circular opening (13). The output shaft of the telescopic motor (10) is fixedly installed with an ejection top block (14). The side surface of the ejection top block (14) is in close contact with the inner wall of the circular opening (13) on the lower mould (5).

5. A gear forging die as defined in claim 1 wherein: The upper mould (12) is transversely provided with an exhaust hole (15). The exhaust hole (15) penetrates through the two side walls of the upper mould (12). The exhaust component is in communication with the exhaust hole (15).

6. A gear forging die as defined in claim 5, wherein: The exhaust component includes a spring (17), a top rod (18), a tapered block (20), and a circular extension block (21). The inside of the upper mould (12) is provided with a top groove (16) above the exhaust hole (15). A taper hole (19) is formed between the exhaust hole (15) and the mould cavity of the upper mould (12). The inner wall of the side of the taper hole (19) corresponding to the exhaust hole (15) is tapered downward. The inside of the top groove (16) is fixedly installed with a spring (17). The lower end of the spring (17) is fixedly installed with a top rod (18). The lower end of the top rod (18) extends into the inside of the taper hole (19). The end of the top rod (18) inside the taper hole (19) is fixedly installed with a tapered block (20). The side surface of the tapered block (20) is tapered. The lower end of the top rod (18) is fixedly installed with a circular extension block (21). The circular extension block (21) extends to the outside of the taper hole (19).

Images