Gear double-sided oil groove forging device and forging method

Abstract

The present invention provides a double-sided oil groove forging device and method for gears, comprising a first die set and a second die set. The first die set is used for forging the front side of a gear blank, while the second die set is used for forging the back side of the gear blank. The first die set comprises a punch, an oil groove seat, and a lower pressure seat. The lower pressure seat has a first through-hole in the center, and the oil groove seat has a second through-hole. The lower pressure seat supports the gear blank. The punch passes through the second through-hole from top to bottom and then into the first through-hole to punch the gear blank. The oil groove seat has a concave cavity corresponding to the front side of the gear. The punch pushes the oil groove seat toward the gear blank, and the concave cavity of the oil groove seat forges the front side of the gear blank to form an oil groove. The second die set comprises an upper die core and a lower die cavity. The lower die cavity matches the front side of the gear blank forged by the first die set, and the upper die core has a boss. The gear blank is forged in a step-by-step closed forging process, which improves the accuracy of the oil groove forging, reduces manufacturing costs, and increases production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of forging production, and in particular relates to a gear double-sided oil groove forging device and a forging method. Background Art

[0002] In order to improve the lubrication effect of the gears, oil grooves are designed on one or both end faces of the gears. The oil grooves can store lubricating oil to ensure that the gears are fully lubricated during operation, reduce wear, and extend service life. For thinner gears (thickness less than 20mm), forging processes are usually used for manufacturing. However, during the cooling process of the forgings, deformation of the forgings is prone to occur, resulting in the inability to stably control the depth of the oil grooves. In order to control the dimensional accuracy of the double-sided oil grooves on the gears, conventional processes use mechanical cutting. Although this method can meet the dimensional accuracy requirements of the gear oil grooves, it has low production efficiency, requires the use of mechanical equipment, and increases labor costs, which in turn leads to increased gear costs. In addition, for thinner gears, after the hot forging is completed, the gears are prone to deformation during the ejection process, which affects the accuracy of the oil grooves and the quality of the gears.

[0003] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a double-sided oil groove forging device and forging method for gears, which performs oil groove forging on the gear blank in two steps to avoid deformation of the oil groove and the gear hole, adopts a closed forging process, improves the oil groove accuracy, reduces manufacturing costs, and improves production efficiency.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a double-sided oil groove forging device for gears, comprising a first die group and a second die group. The first die group is used for forging the front side of the gear blank, and the second die group is used for forging the oil groove on the back side of the gear blank. The first die group comprises a punch, an oil groove seat, and a lower pressure seat. A first through hole is provided in the middle of the lower pressure seat, and a second through hole is provided in the oil groove seat. The lower pressure seat bears the gear blank. The punch passes through the second through hole from top to bottom, and the punch penetrates the first through hole to punch the gear blank. The oil groove seat is provided with a concave cavity corresponding to the front side of the gear. The punch pushes the oil groove seat toward the gear blank, and the concave cavity provided on the oil groove seat forges the front side of the gear blank to form an oil groove. The second die group forges the back side of the gear blank to form a back side oil groove.

[0006] The present invention uses a first die set to simultaneously punch a hole in a gear blank and forge an oil groove on one side, improving processing efficiency. The gear blank is then flipped over and placed in a second die set to forge the oil groove on the other side, forming the reverse oil groove. Forging the double-sided oil grooves in the gear blank prevents deformation and eliminates the need for subsequent machining, significantly reducing manufacturing costs and improving production efficiency.

[0007] Furthermore, in the above-mentioned gear double-sided oil groove forging device, a lower support seat is provided on the lower side of the lower pressure seat, and the lower support seat supports the lower pressure seat. The cross-section of the lower support seat is a "convex" shape, and an avoidance hole is provided in the middle of the lower support seat. The avoidance hole is provided with a supporting step. The lower pressure seat is placed on the upper side of the supporting step. The inner wall of the avoidance hole limits the lower pressure seat. An external thread is provided on the outer side of the lower support seat. A first locking nut is provided on the upper side of the lower support seat. The first locking nut is screwed into the external thread provided on the lower support seat. The first locking nut presses the lower pressure seat against the lower support seat

[0008] Furthermore, in the above-mentioned double-sided oil tank forging device for gears, a bottom plate is provided on the lower side of the lower support seat, the bottom plate is provided with a groove, the lower support seat is arranged in the above-mentioned groove, the bottom plate is provided with a damping device, and the oil tank seat is elastically connected to the bottom plate through the damping device. During the forging process, the punch pushes the oil tank seat for extrusion, and the damping device is deformed under pressure. After the punch completes the punching, the punch moves up, and the damping device pushes the oil tank seat up, separating the oil tank seat and the gear blank to prevent the gear blank and the oil tank seat from sticking together and being unable to remove the material. The first mold group is provided with a movable plate, the movable plate is provided with a lower stepped hole, and the outer wall of the oil tank seat is provided with a stepped shape corresponding to the lower stepped hole, and the lower stepped hole is a through hole with a larger bottom and a smaller top.

[0009] Furthermore, in the aforementioned double-sided oil groove forging device for gears, the damping device includes a column and a spring. One end of the column is fixedly connected to the base plate, and the end of the column away from the base plate is slidably connected to the movable plate. The spring is sleeved on the outside of the column and positioned between the base plate and the movable plate. The spring exerts pressure on the movable plate, pushing the movable plate away from the lower pressure seat, thereby maintaining a distance between the movable plate and the lower pressure seat. During the stamping process, the punch moves downward, squeezing the spring and deforming the movable plate. When the punch moves upward, the spring recovers its deformation, pushing the movable plate upward away from the lower pressure seat.

[0010] Furthermore, in the above-mentioned gear double-sided oil groove forging device, an upper pressure seat is provided on the upper side of the punch, the cross-section of the upper pressure seat is a "convex" shape, an external thread is provided on the outer side of the upper pressure seat, a punch fixing seat is provided on the outer side of the punch, the punch fixing seat forms a support for the punch, a second locking nut is provided on the outer side of the upper pressure seat, the second locking nut is screwed into the external thread provided on the upper pressure seat, the second locking nut squeezes the punch fixing seat in the direction of the upper pressure seat, and the second locking nut fixes the punch fixing seat to the upper pressure seat.

[0011] Furthermore, in the above-mentioned gear double-sided oil groove forging device, the punch fixing seat is provided with an upper stepped hole, which is a through hole that is larger at the top and smaller at the bottom. The upper end of the punch is stepped corresponding to the upper stepped hole. The punch penetrates into the upper stepped hole, and the upper stepped hole forms a support for the punch.

[0012] Furthermore, in the aforementioned double-sided oil groove forging device for gears, the second die set includes an upper die core and a lower die cavity. The lower die cavity matches the front face of the gear blank forged by the first die set, and the upper die core is provided with a boss. During forging, the upper die core and the lower die cavity form a closed forging chamber. After being forged by the first die set, the gear blank is flipped over and placed in the lower die cavity, where the boss forges the back face of the gear blank. The upper die core and the lower die cavity form a closed space within which the gear blank is formed. The gear and its oil groove produced by closed forging have high precision, eliminating the need for subsequent oil groove machining, significantly reducing manufacturing costs and improving production efficiency.

[0013] Furthermore, in the above-mentioned gear double-sided oil groove forging device, the second die group includes a push rod, a first die core, and a second die core. The first die core is sleeved on the outside of the push rod, and the push rod and the first die core are slidably connected. The second die core is sleeved on the outside of the first die core, and the first die core and the second die core are slidably connected. The top surface of the push rod is provided with a first molding surface, the top end of the first die core is provided with a second molding surface, and the side wall of the second die core is provided with a third molding surface. The first molding surface, the second molding surface, and the third molding surface together constitute the lower die cavity. During forging, the bottom ends of the push rod, the first die core, and the second die core are supported by the bottom plate, and the gear blank is forged and formed in the lower die cavity. After forging is completed, the push rod, the first die core, and the second die core eject the gear blank step by step.

[0014] Furthermore, in the above-mentioned gear double-sided oil groove forging device, the second die assembly includes an upper die shell, which is sleeved on the outside of the upper die core, and the upper die shell and the upper die core are slidably connected. The outer side of the second die core is sleeved with a lower die shell, and the second die core and the lower die shell are slidably connected. The upper end of the lower die shell is provided with a lower die shell step. During forging, the lower end of the upper die shell contacts the lower die shell step, and a gap is left between the lower end surface of the upper die shell and the second die core. The above gap forms a discharge groove. During the forging process, excess blank flows into the discharge groove, ensuring the uniform thickness of the forged gear, thereby controlling the accuracy of the oil groove.

[0015] Furthermore, in the above-mentioned gear double-sided oil groove forging device, the outer wall of the first die core is provided with a first limiting step, and the first limiting step is provided at the lower end of the first die core. The inner wall of the second die core is provided with a second limiting step, and the second limiting step is provided at the upper end of the second die core. The outer wall of the second die core is provided with a third limiting step, and the third limiting step is provided at the lower end of the second die core. The inner wall of the lower mold shell is provided with a fourth limiting step, and the fourth limiting step is provided at the upper end of the lower mold shell. The outer wall of the push rod is provided with a sixth limiting step, and the sixth limiting step is provided at the lower end of the push rod. The inner wall of the first die core is provided with a fifth limiting step, and the fifth limiting step is provided at the lower end of the first die core. When the mold is closed, the first limiting step and the second limiting step maintain a distance. The third limiting step and the fourth limiting step maintain a distance, and the fifth limiting step and the sixth limiting step conflict with each other. During mold separation, the ejector pin drives the first die core upward to eject the gear blank. At this time, there is adhesion between the second die core and the gear blank, and the second die core is carried upward by the gear blank. After moving a certain distance, the second die core is pulled by the fourth limiting step provided on the lower mold shell, and the second die core is first separated from the gear blank. Then the ejector pin moves downward. When the first die core is restricted by the bottom plate and cannot move, the ejector pin continues to move downward, separating the top of the ejector pin from the gear blank. At this time, only the gear blank and the top of the first die core need to be separated to remove the gear blank. The step-by-step ejection method reduces the separation force on the gear blank each time, avoids the possibility of deformation caused by excessive force on the thin gear blank itself, and improves the quality and precision of the forging product.

[0016] A forging method for a double-sided oil groove of a gear comprises the following steps:

[0017] Step 1: Controlling the blank temperature to ≤800 degrees, the first die set punches and performs single-side oil groove forging on the gear blank;

[0018] Step 2: Turn the gear blank over and place it in the lower die cavity of the second die set, and forge the gear blank into shape by the second die set;

[0019] Step 3: Use the ejector pin to push the gear blank upwards.

[0020] Furthermore, in the above-mentioned gear double-sided oil groove forging method, in step 1, the punching stroke is controlled, thereby controlling the distance from the bottom of the oil groove seat to the top surface of the gear blank, and controlling the oil groove depth to meet technical requirements.

[0021] As can be seen from the above technical solution, the present invention has the following beneficial effects: The present invention utilizes a first die set and a second die set forging process in stages, wherein the punch and the oil groove seat perform the forging operations sequentially, thereby preventing deformation of the oil groove and the gear hole. The gear blank is forged in the lower die cavity, forming a reverse oil groove. This improves the forging accuracy of the oil groove and eliminates the need for subsequent machining of the oil groove, significantly reducing manufacturing costs and improving production efficiency. During mold separation, the gear blank is ejected in stages, reducing the stress on the gear and preventing deformation caused by excessive stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a cross-sectional view of the first mold assembly state of the present invention;

[0023] Figure 2 This is a cross-sectional view of the first mold component in the molding state of the present invention;

[0024] Figure 3 This is a cross-sectional view of the second mold assembly state of the present invention;

[0025] Figure 4 This is a cross-sectional view of the second mold component in the molding state of the present invention;

[0026] Figure 5 This is a cross-sectional view of the gear blank described in the present invention.

[0027] In the figure: 1, first die group, 11, punch, 111, upper pressure seat, 112, punch fixing seat, 113, second locking nut, 114, upper stepped hole, 12, oil tank seat, 121, second through hole, 122, concave cavity, 13, lower pressure seat, 131, first through hole, 14, movable plate, 141, lower stepped hole, 15, lower support seat, 151, avoidance hole, 152, support step, 16, first locking nut, 161, damping device, 162, column, 163, spring, 17, bottom plate, 2, second die group, 21, Upper mold core, 211, boss, 212, upper mold shell, 22, lower mold cavity, 221, push rod, 2211, first molding surface, 2212, sixth limiting step, 222, first die core, 2221, first limiting step, 2222, second molding surface, 2223, fifth limiting step, 223, second die core, 224, lower mold shell, 2241, fourth limiting step, 225, lower mold shell step, 226, discharge chute, 2231, second limiting step, 2232, third molding surface, 2233, third limiting step, 3, gear blank. DETAILED DESCRIPTION

[0028] Example 1

[0029] like Figure 1-5The device for forging a double-sided oil groove on a gear comprises a first die set 1 and a second die set 2. The first die set 1 is used for forging the front side of a gear blank 3, while the second die set 2 is used for forging the back side of the gear blank 3. The first die set 1 includes a punch 11, an oil groove seat 12, and a lower pressure seat 13. The lower pressure seat 13 has a first through-hole 131 in the center, and the oil groove seat 12 has a second through-hole 121. The lower pressure seat 13 supports the gear blank 3. The punch 11 passes through the second through-hole 121 from top to bottom and then into the first through-hole 131 to punch the gear blank 3. The oil groove seat 12 has a cavity 122 corresponding to the front side of the gear. The punch 11 pushes the oil groove seat 12 toward the gear blank 3. The cavity 122 on the oil groove seat 12 forges the front side of the gear blank 3, forming an oil groove. The second die set 2 forges the back side of the oil groove.

[0030] like Figure 2The device for forging a double-sided oil groove for a gear is shown. A lower support seat 15 is provided on the lower side of a lower pressure seat 13. The lower support seat 15 supports the lower pressure seat 13. The cross-section of the lower support seat 15 is convex. A relief hole 151 is provided in the middle of the lower support seat 15. The relief hole 151 is provided with a support step 152. The lower pressure seat 13 is placed above the support step 152. The inner wall of the relief hole 151 limits the position of the lower pressure seat 13. The outer side of the lower support seat 15 is provided with an external thread. The upper side of the lower support seat 15 is provided with a first locking nut 16. The first locking nut 16 is screwed into the external thread provided on the lower support seat 15. The first locking nut 16 presses the lower pressure seat 13 against the lower support seat 15. A bottom plate 17 is provided on the lower side of the lower support seat 15. The bottom plate 17 has a groove, and the lower support seat 15 is disposed in the above-mentioned groove. The bottom plate 17 is provided with a damping device 161. The oil groove seat 12 is elastically connected to the bottom plate 17 via the damping device 161. During the forging process, the punch 11 pushes the oil trough seat 12, squeezing it and deforming the damping device 161. After the punch 11 completes the punching, it moves upward, pushing the damping device 161 upward, separating the oil trough seat 12 from the gear blank 3. The first die assembly 1 includes a movable plate 14 with a lower stepped hole 141. The outer wall of the oil trough seat 12 is stepped to match the lower stepped hole 141, which is a through hole with a larger bottom and a smaller top. The damping device 161 includes a column 162 and a spring 163. One end of the column 162 is fixedly connected to the base plate 17, while the end of the column 162 away from the base plate 17 is slidably connected to the movable plate 14. The spring 163 is sleeved on the outside of the column 162 and positioned between the base plate 17 and the movable plate 14. The spring 163 exerts pressure on the movable plate 14, pushing the movable plate 14 away from the lower pressure seat 13, thereby maintaining a distance between the movable plate 14 and the lower pressure seat 13. During the stamping process, when the punch 11 moves downward, the spring 163 is squeezed and deformed by the movable plate 14. When the punch 11 moves upward, the spring 163 recovers its deformation, pushing the movable plate 14 upward away from the lower pressure seat 13. An upper pressure seat 111 is provided on the upper side of the punch 11. The cross-section of the upper pressure seat 111 is a "convex" shape. An external thread is provided on the outer side of the upper pressure seat 111. A punch fixing seat 112 is provided on the outer side of the punch 11. The punch fixing seat 112 supports the punch 11. A second locking nut 113 is provided on the outer side of the upper pressure seat 111. The second locking nut 113 is screwed into the external thread provided on the upper pressure seat 111. The second locking nut 113 squeezes the punch fixing seat 112 in the direction of the upper pressure seat 111. The second locking nut 113 fixes the punch fixing seat 112 to the upper pressure seat 111. An upper stepped hole 114 is provided on the punch fixing seat 112. The upper stepped hole 114 is a through hole that is larger at the top and smaller at the bottom. The upper end of the punch 11 is stepped corresponding to the upper stepped hole 114. The punch 11 penetrates into the upper stepped hole 114, and the upper stepped hole 114 supports the punch 11.

[0031] like Figure 3-4The device for forging a double-sided oil groove for a gear is shown. The second die set 2 includes an upper die core 21 and a lower die cavity 22. The lower die cavity 22 matches the front of the gear blank 3 forged by the first die set 1. The upper die core 21 is provided with a boss 211. During forging, the upper die core 21 and the lower die cavity 22 form a closed forging cavity. After being forged by the first die set 1, the gear blank 3 is turned over and placed in the lower die cavity 22. The boss 211 forges the back of the gear blank 3. The second die set 2 includes a push rod 221, a first die core 222, and a second die core 223. The first die core 222 is sleeved on the outside of the push rod 221, and the push rod 221 and the first die core 222 are slidably connected. The second die core 223 is sleeved onto the outside of the first die core 222. The first and second die cores 222 and 223 are slidably connected. The top surface of the ejector pin 221 is provided with a first molding surface 2211. The top of the first die core 222 is provided with a second molding surface 2222. The sidewall of the second die core 223 is provided with a third molding surface 2232. The first molding surface 2211, the second molding surface 2222, and the third molding surface 2232 together form the lower die cavity 22. During forging, the ejector pin 221, the first die core 222, and the second die core 223 are supported at their bottom ends by the base plate, and the gear blank 3 is forged and formed in the lower die cavity 22. After forging is completed, the ejector pin 221, the first die core 222, and the second die core 223 eject the gear blank 3 in steps. The second die assembly 2 includes an upper die shell 212, which sleeves onto the outside of the upper die core 21 and is slidably connected to the upper die core 21. The second die core 223 is sleeved with a lower die shell 224 on the outside, and the second die core 223 and the lower die shell 224 are slidably connected. A lower die shell step 225 is provided at the upper end of the lower die shell 224. During forging, the lower end of the upper die shell 212 contacts the lower die shell step 225, and a gap is left between the lower end surface of the upper die shell 212 and the second die core 223. The above gap forms a discharge groove 226. During the forging process, excess blanks flow into the discharge groove 226 to ensure that the thickness of the forged gear is consistent, thereby controlling the accuracy of the oil tank. A first limiting step 2221 is provided on the outer wall of the first die core 222, and the first limiting step 2221 is provided at the lower end of the first die core 222. A second limiting step 2231 is provided on the inner wall of the second die core 223, and the second limiting step 2231 is provided at the upper end of the second die core 223. A third limiting step 2233 is provided on the outer wall of the second die core 223, and is located at the lower end of the second die core 223. A fourth limiting step 2241 is provided on the inner wall of the lower mold shell 224, and is located at the upper end of the lower mold shell 224. A sixth limiting step 2212 is provided on the outer wall of the ejector pin 221, and is located at the lower end of the ejector pin 221. A fifth limiting step 2223 is provided on the inner wall of the first die core 222, and is located at the lower end of the first die core 222.

[0032] During mold closing, the first limiting step 2221 and the second limiting step 2231 maintain a distance. The third limiting step 2233 and the fourth limiting step 2241 maintain a distance, and the fifth limiting step 2223 and the sixth limiting step 2212 interfere with each other. During mold opening, the ejector pin 221 drives the first die core 222 upward to eject the gear blank 3. At this time, there is adhesion between the second die core 223 and the gear blank 3, and the second die core 223 is moved upward by the gear blank 3. After moving a certain distance, the second die core 223 is pulled by the fourth limiting step 2241 provided on the lower mold shell 224, and the second die core 223 is first separated from the gear blank 3. Then the push rod 221 moves downward, and when the first die core 222 is restricted by the bottom plate and cannot move, the push rod 221 continues to move downward, separating the top of the push rod 221 from the gear blank 3. At this time, it is only necessary to separate the gear blank 3 from the top of the first die core 222 to remove the gear blank 3. The step-by-step ejection method reduces the separation force exerted on the gear blank 3 each time, avoids the possibility of deformation of the thin gear blank 3 due to excessive force, and improves the quality and precision of the product forging.

[0033] The forging method of the double-sided oil groove of the gear in this embodiment includes the following steps:

[0034] Step 1: Control the blank temperature to ≤800 degrees, and perform punching and single-side oil groove forging on the gear blank 3 by the first die set 1;

[0035] Step 2: Turn the gear blank 3 over and place it in the lower die cavity 22 provided in the second die set 2, and forge the gear blank 3 with the second die set 2;

[0036] Step 3: The ejector rod 221 ejects the gear blank 3 upward.

[0037] The above embodiments are illustrative and are intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A gear double-sided oil groove forging device, characterized by: The invention comprises a first die set (1) and a second die set (2), wherein the first die set (1) is used for forging the front side of a gear blank (3), and the second die set (2) is used for forging the oil groove on the back side of the gear blank (3); the first die set (1) comprises a punch (11), an oil groove seat (12), and a lower pressure seat (13), wherein a first through hole (131) is provided in the middle of the lower pressure seat (13), the oil groove seat (12) is provided with a second through hole (121), and the lower pressure seat (13) bears the gear blank (3); the punch (11) passes through the second through hole (121) from top to bottom, and the punch (11) penetrates the first through hole (131) to punch the gear blank (3); the oil groove seat (12) is provided with a concave cavity (122) corresponding to the front side of the gear, the punch (11) pushes the oil groove seat (12) to move toward the gear blank (3), and the concave cavity (122) forges the front side of the gear blank (3); The second die set (2) comprises an upper die core (21) and a lower die cavity (22), wherein the lower die cavity (22) matches the front side of the gear blank (3) forged by the first die set (1), and the upper die core (21) is provided with a boss (211); during forging, the upper die core (21) and the lower die cavity (22) form a closed forging cavity, and the gear blank (3) is turned over and placed in the lower die cavity (22) after being forged by the first die set (1), and the boss (211) forges the reverse side of the gear blank (3); The second mold assembly (2) comprises a push rod (221), a first die core (222), and a second die core (223); the first die core (222) is sleeved on the outside of the push rod (221); the push rod (221) and the first die core (222) are slidably connected; the second die core (223) is sleeved on the outside of the first die core (222); the first die core (222) and the second die core (223) are slidably connected; the top surface of the push rod (221) is provided with a There is a first mold surface (2211), a second mold surface (2222) is provided on the top of the first die core (222), and a third mold surface (2232) is provided on the side wall of the second die core (223); the first mold surface (2211), the second mold surface (2222), and the third mold surface (2232) together constitute a lower die cavity (22); after forging is completed, the push rod (221), the first die core (222), and the second die core (223) eject the gear blank (3) step by step.

2. The gear double-sided oil groove forging device according to claim 1, characterized in that: A lower support seat (15) is provided on the lower side of the lower pressure seat (13), and the lower support seat (15) supports the lower pressure seat (13). The cross section of the lower support seat (15) is a "convex" shape. A avoidance hole (151) is provided in the middle of the lower support seat (15), and the avoidance hole (151) is provided with a support step (152). The lower pressure seat (13) is placed on the upper side of the support step (152). An external thread is provided on the outer side of the upper end of the lower support seat (15). A first locking nut (16) is provided on the upper side of the lower support seat (15), and the first locking nut (16) is screwed into the external thread provided on the lower support seat (15). The first locking nut (16) presses the lower pressure seat (13) against the lower support seat (15).

3. The gear double-sided oil groove forging device according to claim 2, characterized in that: A bottom plate (17) is provided on the lower side of the lower support seat (15), the bottom plate (17) is provided with a groove, the lower support seat (15) is provided in the above groove, the bottom plate (17) is provided with a damping device (161), and the oil tank seat (12) is damping-connected to the bottom plate (17) via the damping device (161); the first mold group (1) is provided with a movable plate (14), the movable plate (14) is provided with a lower stepped hole (141), the outer wall of the oil tank seat (12) is provided with a stepped shape corresponding to the lower stepped hole (141), the lower stepped hole (141) is a through hole with a larger bottom and a smaller top, and the oil tank seat (12) is provided in the lower stepped hole (141).

4. The gear double-sided oil groove forging device according to claim 3, characterized in that: The damping device (161) includes a column (162) and a spring (163). One end of the column (162) is fixedly connected to the base plate (17). One end of the column (162) away from the base plate (17) is slidably connected to the movable plate (14). The spring (163) is sleeved on the outside of the column (162). The spring (163) is placed between the base plate (17) and the movable plate (14). The spring (163) squeezes the movable plate (14).

5. The gear double-sided oil groove forging device according to claim 1, characterized in that: An upper pressure seat (111) is provided on the upper side of the punch (11), the cross section of the upper pressure seat (111) is convex, an external thread is provided on the outer side of the upper pressure seat (111), a punch fixing seat (112) is provided on the outer side of the punch (11), the punch fixing seat (112) supports the punch (11), a second locking nut (113) is provided on the outer side of the upper pressure seat (111), the second locking nut (113) is screwed into the external thread provided on the upper pressure seat (111), the second locking nut (113) squeezes the punch fixing seat (112) in the direction of the upper pressure seat (111), and the punch fixing seat (112) fixes the punch (11) to the upper pressure seat (111).

6. The gear double-sided oil groove forging device according to claim 1, characterized in that: The second die assembly (2) includes an upper die shell (212), which is sleeved on the outer side of the upper die core (21), and the upper die shell (212) and the upper die core (21) are slidably connected; a lower die shell (224) is sleeved on the outer side of the second die core (223), and the second die core (223) and the lower die shell (224) are slidably connected; a lower die shell step (225) is provided at the upper end of the lower die shell (224); during forging, the lower end of the upper die shell (212) contacts the lower die shell step (225), and a gap is left between the lower end surface of the upper die shell (212) and the second die core (223), and the above gap forms a discharge groove (226).

7. The gear double-sided oil groove forging device according to claim 6, characterized in that: The outer wall of the first die core (222) is provided with a first limiting step (2221), and the first limiting step (2221) is provided at the lower end of the first die core (222); the inner wall of the second die core (223) is provided with a second limiting step (2231), and the second limiting step (2231) is provided at the upper end of the second die core (223); the outer wall of the second die core (223) is provided with a third limiting step (2233), and the third limiting step (2233) is provided at the lower end of the second die core (223); the inner wall of the lower mold shell (224) is provided with a fourth limiting step (2241), and the fourth limiting step (2241) is provided at the lower end. The mold shell (224) is provided with a sixth limiting step (2212) on the outer wall of the push rod (221), and the sixth limiting step (2212) is provided at the lower end of the push rod (221). The inner wall of the first die core (222) is provided with a fifth limiting step (2223), and the fifth limiting step (2223) is provided at the lower end of the first die core (222). When the mold is closed, the first limiting step (2221) and the second limiting step (2231) maintain a distance; the third limiting step (2233) and the fourth limiting step (2241) maintain a distance, and the fifth limiting step (2223) and the sixth limiting step (2212) conflict with each other.

8. A method for forging a double-sided oil groove of a gear, used in the forging device according to any one of claims 1 to 7, the forging method comprising the following steps: Step 1: Controlling the blank temperature to ≤800 degrees, the first die set (1) punches and performs single-side oil groove forging on the gear blank (3); Step 2: Turn the gear blank (3) over and place it in the lower die cavity (22) provided in the second die set (2); the second die set (2) forges the gear blank (3); Step 3: The ejector rod (221) ejects the gear blank (3) upward.

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