An engine piston forging equipment and forging process

Abstract

The present invention discloses an engine piston forging device and a forging process, belonging to the technical field of engine piston forging processing. The engine piston forging device and the forging process include a forging machine and an upper moving die that moves up and down in the forging machine driven by hydraulic pressure. A boss coaxially distributed with the upper moving die is fixedly installed on the forging machine. The upper end surface of the boss is fixedly installed with a fixed die through a fixing column, and a moving cylinder is slidably connected to the boss along the axial direction. The upper end surface of the moving cylinder is fixedly installed with a lower moving die that is snap-fitted and connected below the fixed die, and an ejector rod is slidably connected to the lower moving die along the axial direction. A heating mechanism for heating the fixed die and the piston blank to increase the forging temperature is further provided on the boss. Through the combined upper moving die, fixed die, and lower fixed die, the piston blank can be forged multiple times, and the piston blank can be heated in sections, improving the forging quality.

Description

Technical Field

[0001] The present invention relates to the technical field of engine piston forging processing, and specifically to an engine piston forging device and forging process. Background Technique

[0002] An engine piston forging device is a key device for manufacturing high-performance engine pistons. By the action of pressure and temperature on metal materials, pistons with specific shapes and properties are formed. The surface of the forged pistons is more wear-resistant and durable, and the internal structure is uniform and dense, which can improve the strength and durability of the pistons.

[0003] For example, the patent with the publication number CN219703364U discloses a compressor piston forging die, including a die box. An installation plate is slidably assembled inside the die box. A lower die seat is bolted to the upper end surface of the installation plate. A die cavity is formed in the middle of the lower die seat. The upper end surface of the installation plate is fixedly connected to a support plate through a plurality of support rods. A cylinder is installed on the upper end surface of the support plate. The output end of the cylinder is fixedly connected to a lifting plate. An upper die seat is bolted to the bottom of the lifting plate. After the die is opened, the ejecting assembly will drive the pushing block to move upward, and the pushing block will eject the piston forging part, thereby facilitating the operator to take out the piston forging part and avoiding the piston forging part being adsorbed in the die cavity of the lower die seat, which makes it difficult for the operator to take out.

[0004] For example, the patent with the publication number CN110576135B discloses a multi-sided forging type forging device, including a bracket and a forging platform. A forging lower die is fixed on the top of the forging platform. A forging hydraulic cylinder is arranged on the support frame, and a forging punch structure is fixed on the piston shaft of the forging hydraulic cylinder. At least two forging supports are also fixed on the forging platform. A control cylinder is fixed on the forging support. A side punch structure is fixed on the forging rib rod. The forging punch structure includes a forging panel. A telescopic cylinder is fixed in the middle of the top surface of the forging panel. A positioning rib rod is fixed on the piston shaft of the telescopic cylinder. The side punch structure includes a stamping panel. A transverse pressing cylinder is fixed on the forging rib rod. A transverse pressing rod is fixed on the piston shaft of the transverse pressing cylinder. Multiple-sided forging processing is completed in the same forging lower die, and there will be no mutual influence during forging, which improves the forging efficiency, forging accuracy, and has strong applicability and good practicability.

[0005] For another example, the patent with the publication number CN213645751U discloses a hydraulic forging device for forging metal devices, which includes an installation table. The upper surface of the installation table is connected with a first acting cylinder and a second acting cylinder through multiple connecting rods. The first acting cylinder and the second acting cylinder are connected in communication. The bottom parts of the first acting cylinder and the second acting cylinder respectively penetrate and are connected with a first piston rod and a second piston rod. The lower surfaces of the first piston rod and the second piston rod are respectively fixedly connected with a roller and a forging hammer. The electric push rod is used to drive the pushing table to move. The pushing table contacts the roller and drives the first piston rod to move through the roller, and then drives the second piston rod and the forging hammer to move. That is, the moving distance of the forging hammer is proportional to the moving distance of the pushing table. By controlling the moving distance of the piston end of the electric push rod, the moving distance of the forging hammer can be controlled, and then workpieces with different thicknesses can be forged, improving the practicability of the device. The pistons of some large engines are relatively large in volume, and the piston blank is a cylindrical structure. During the forging process, the accuracy of one-time forging processing is relatively low. Under multiple forging, the temperature difference between the blank and the die gradually decreases, and the surface temperature of the die will rise rapidly, resulting in increased friction between the die and the blank, thus leading to increased wear on the surface of the die, especially more obvious at the protrusions or arc protrusions of the die. In addition, the internal stress distribution of the forgings is uneven, which is likely to cause uneven deformation of the forgings and affect the forging processing quality.

[0006] In view of the above problems, it is urgent to innovate and design on the basis of the original engine piston forging equipment. Summary of the Invention

[0007] The purpose of the present invention is to provide an engine piston forging equipment and a forging process to solve the problems of relatively low accuracy in one-time forging processing, gradually decreasing temperature difference between the blank and the die under multiple forging, resulting in increased friction between the die and the blank and prone to uneven deformation of the forgings as mentioned in the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solutions: An engine piston forging equipment and a forging process, including a forging machine and an upper moving die that moves up and down in the forging machine driven by hydraulic pressure. A convex platform coaxially distributed with the upper moving die is fixedly installed on the forging machine. A fixed die is fixedly installed on the upper end surface of the convex platform through a fixed column. A moving cylinder is slidably connected to the convex platform along the axial direction. The upper end surface of the moving cylinder is fixedly installed with a lower moving die that is snap-connected below the fixed die. A ejector rod is slidably connected to the lower moving die along the axial direction. A driving mechanism for synchronously controlling the reverse movement of the lower moving die and the ejector rod is arranged in the convex platform. A heating mechanism for heating the fixed die and the piston blank to increase the forging temperature is also arranged on the convex platform.

[0009] Preferably, the driving mechanism includes a guide column fixed to the bottom of the boss, the ejector rod is connected through the top of the guide column, and a clamping strip is fixedly installed on the outside of the ejector rod, and the clamping strip is slidably installed in the guide column; a transmission gear is rotatably connected in the boss, one side of the transmission gear is meshed with an active rack, the active rack is fixed on the inner side wall of the moving cylinder, and the other side of the transmission gear is meshed with a driven rack, and the driven rack is fixed on the outer side wall of the ejector rod.

[0010] Preferably, a side groove is provided on the upper outer side of the guide column, the transmission gear is passed through the side groove, and the position of the driven rack corresponds to the position of the side groove.

[0011] Preferably, the heating mechanism includes a turntable rotatably mounted on the outside of the boss, a main heating component for heating the side of the fixed mold is provided on the turntable, a secondary heating component for directly heating the piston blank is provided on the main heating component, and an auxiliary heating component for heating the bottom of the fixed mold or the piston blank is also provided on the turntable.

[0012] Preferably, the main heating assembly includes a plurality of fixed brackets fixed on the turntable at equal angles, and fixed burners are fixedly mounted on the fixed brackets.

[0013] Preferably, the auxiliary heating assembly includes a slip ring slidably mounted on a fixed bracket, a lifting bracket is fixedly mounted on the slip ring, a plurality of movable brackets are fixed at equal angles on the lifting bracket, and a movable burner is fixedly mounted on the movable bracket; the movable burner and the fixed burner are distributed circumferentially at intervals.

[0014] Preferably, two mounting brackets are fixed symmetrically on the upper end surface of the turntable about the axis, a transverse bracket is slidably connected to the mounting bracket, and a bottom burner is fixedly mounted on the transverse bracket; the bottom burner is correspondingly arranged on the lower end surface of the fixed mold.

[0015] Preferably, a guide slide is fixedly installed on the upper surface of the turntable, and a screw is rotatably connected between the guide slide and the turntable. The external threaded sleeve of the screw is provided with an internal threaded column, and the outside of the internal threaded column is fixedly connected to a cross bar; the external oblique sliding sleeve of the guide slide is provided with a sleeve, and the sleeve sliding sleeve is provided on the outside of the cross bar; the outside of the transverse bracket is fixedly connected to a longitudinal rod, and the external sliding sleeve of the longitudinal rod is provided with a transmission bracket, and the transmission bracket is fixedly connected to the sleeve.

[0016] Preferably, the outside of the boss is fixedly connected to an inner gear ring through a connecting frame; a supporting bracket is fixedly installed on the lower surface of the turntable, a motor is fixedly installed on the supporting bracket, and the output end of the motor is connected to a driving gear, the driving gear is meshed with the inner gear ring, and the driving gear is coaxially connected to the screw rod.

[0017] An engine piston forging device is disclosed, and a forging process is also disclosed. The specific process steps are as follows:

[0018] S1. The combined die controls the reverse movement of the lower moving die and the ejector rod, closes the lower end of the fixed die, places the piston blank in the fixed die, and hydraulically drives the upper moving die to move downward. The upper moving die stamping-forges the piston blank in the fixed die.

[0019] S2. Forging heating: During the forging process, the outer side and bottom of the fixed die are heated respectively by the fixed burner, the moving burner, and the bottom burner to maintain the forging temperature of the piston blank inside the fixed die.

[0020] S3. Automatic demoulding and multi-stage forging: Control the upper moving die to move upward, then control the reverse movement of the lower moving die and the ejector rod. The ejector rod pushes the piston blank in the fixed die to move upward for demoulding, and multi-stage forging is carried out to provide forging accuracy.

[0021] S4. Sectional heating: The fixed burner heats the outside of the fixed die, the moving burner moves upward to heat the piston blank, and the bottom burner moves to heat the bottom of the piston blank. Sectional heating increases the forging temperature, thereby improving the plasticity of the piston blank and reducing the deformation resistance.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The forging equipment for engine pistons continuously forges and processes the piston blank multiple times through the combined upper moving die, fixed die, lower moving die, and ejector rod, and heats and raises the temperature of the piston blank and the fixed die sectionally to improve the quality of forging and processing.

[0023] Furthermore, a driving mechanism for synchronously controlling the reverse movement of the lower moving die and the ejector rod is provided in the convex platform. When controlling the movement of the lower moving die, under the meshing transmission of the driving rack, transmission gear, and driven rack, the ejector rod can be controlled to move in the opposite direction to the lower moving die, so as to quickly push the piston blank in the fixed die to move upward for demoulding, facilitating multi-stage forging and processing of it, and also facilitating the heat treatment of the piston blank.

[0024] Furthermore, a heating mechanism for heating the fixed die and the piston blank to increase the forging temperature is also provided on the convex platform. The heating mechanism includes a main heating component, a secondary heating component, and an auxiliary heating component. The fixed burner in the main heating component can directly heat the outside of the fixed die, the moving burner in the secondary heating component can move to heat the piston blank, and the auxiliary burner can move to heat the bottom of the piston blank.

[0025] Control the rotation of the control screw rod. Under the screw thread transmission, control the upward movement of the internally threaded column. The internally threaded column drives the moving burner to move upward through the lifting frame to adjust the heating position of the moving burner. At the same time, the internally threaded column drives the sleeves on both sides to move obliquely. The sleeves control the lateral movement of the bottom burner through the transmission bracket to adjust the heating position of the bottom burner, so as to preferably heat the fixed die and the piston blank sectionally at different stages of forging and processing.

[0026] When the control screw rod rotates, the screw rod drives the driving gear to rotate synchronously. Under the meshing transmission with the internal gear ring, the driving gear can rotate along the circumferential direction of the internal gear ring. The driving gear drives the turntable to rotate on the convex platform, so that the fixed burner, the movable burner and the bottom burner rotate circumferentially, expanding the heating range and improving the heating effect. Brief Description of the Drawings

[0027] Figure 1 It is a schematic three-dimensional structure diagram of the forging machine of the present invention.

[0028] Figure 2 It is a schematic three-dimensional structure diagram of the turntable of the present invention.

[0029] Figure 3 It is a schematic three-dimensional structure diagram of the convex platform of the present invention.

[0030] Figure 4 It is a schematic cross-sectional structure diagram of the fixed mold of the present invention.

[0031] Figure 5 It is a schematic three-dimensional structure diagram of the transmission gear of the present invention.

[0032] Figure 6 It is a schematic three-dimensional structure diagram of the fixed burner of the present invention.

[0033] Figure 7 It is a schematic three-dimensional structure diagram of the movable burner of the present invention.

[0034] Figure 8 It is a schematic three-dimensional structure diagram of the bottom burner of the present invention.

[0035] Figure 9 It is a schematic three-dimensional structure diagram of the lifting frame of the present invention.

[0036] Figure 10 It is a schematic three-dimensional structure diagram of the transmission bracket of the present invention.

[0037] Figure 11 It is a schematic three-dimensional structure diagram of the screw rod of the present invention.

[0038] Figure 12 It is a schematic three-dimensional structure diagram of the internal gear ring of the present invention.

[0039] Figure 13 It is a schematic three-dimensional structure diagram of the driving gear of the present invention.

[0040] In the figure: 1. forging machine; 2. upper movable die; 3. boss; 4. fixed column; 5. fixed die; 6. movable cylinder; 7. lower movable die; 8. ejector rod; 9. guide column; 10. clamping bar; 11. transmission gear; 12. active rack; 13. driven rack; 14. side groove; 15. turntable; 16. fixed bracket; 17. fixed burner; 18. slip ring; 19. lifting frame; 20. movable bracket; 21. movable burner; 22. mounting frame; 23. horizontal bracket; 24. bottom burner; 25. guide slide; 26. screw; 27. internal thread column; 28. sleeve; 29. horizontal bar; 30. longitudinal bar; 31. transmission bracket; 32. connecting frame; 33. inner gear ring; 34. supporting frame; 35. motor; 36. driving gear. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Example 1: Please refer to Figures 1-13 The present invention provides the following technical solutions: an engine piston forging device and forging process, comprising a forging machine 1 and an upper movable die 2 driven by hydraulic pressure to move up and down in the forging machine 1, a boss 3 coaxially distributed with the upper movable die 2 is fixedly mounted on the forging machine 1, a fixed die 5 is fixedly mounted on the upper end surface of the boss 3 via a fixed column 4, and a movable cylinder 6 is slidably connected to the boss 3 along the axial direction, a lower movable die 7 engaged with the lower side of the fixed die 5 is fixedly mounted on the upper end surface of the movable cylinder 6, and an ejector rod 8 is slidably connected to the lower movable die 7 along the axial direction; a driving mechanism for synchronously controlling the reverse movement of the lower movable die 7 and the ejector rod 8 is provided in the boss 3.

[0043] The driving mechanism includes a guide column 9 fixed to the bottom of the boss 3, the ejector rod 8 is connected to the top of the guide column 9, and a clamping strip 10 is fixedly installed on the outside of the ejector rod 8, and the clamping strip 10 is engaged and slidably installed in the guide column 9; a transmission gear 11 is rotatably connected to the boss 3, and one side of the transmission gear 11 is meshed with an active rack 12, which is fixed to the inner wall of the moving cylinder 6, and the other side of the transmission gear 11 is meshed with a driven rack 13, which is embedded and fixed on the outer wall of the ejector rod 8.

[0044] A side groove 14 is formed on the upper outer side of the guide column 9 , and the transmission gear 11 is passed through the side groove 14 . The position of the driven rack 13 corresponds to the position of the side groove 14 .

[0045] Place the heat-treated piston blank into the fixed mold 5. The lower moving mold 7 and the ejector rod 8 are blocked at the lower end of the fixed mold 5. Control the upper moving mold 2 to move downward by hydraulic driving force. The upper moving mold 2 presses on the surface of the piston blank, shaping the piston blank by pressure. After one stamping and forging, control the upper moving mold 2 to move upward. The upper moving mold 2 moves away from the piston blank. Control the hydraulic rod in the convex platform 3 to move the moving cylinder 6 downward. The moving cylinder 6 drives the lower moving mold 7 to move downward synchronously. The driving rack 12 on the inner side wall of the lower moving mold 7 meshes with the side of the transmission gear 11 and moves downward. Control the transmission gear 11 to rotate through meshing transmission. The rotating transmission gear 11 pushes the driven rack 13 upward through meshing transmission. The driven rack 13 drives the ejector rod 8 to move upward. The ejector rod 8 is connected to the guide post 9 through the clamping strip 10 and moves upward. The ejector rod 8 pushes the piston blank in the fixed mold 5 upward to demold. After demolding, heat-treat the piston blank and the fixed mold 5 in sections to quickly control the temperature rise of the piston blank.

[0046] Then control the moving cylinder 6 and the lower moving mold 7 to move upward. Control the ejector rod 8 to move downward under the meshing transmission of the driving rack 12, the transmission gear 11, and the driven rack 13, so that the lower moving mold 7 and the ejector rod 8 are re-closed at the bottom of the fixed mold 5. The piston blank re-enters the interior of the fixed mold 5 under the action of gravity. Control the upper moving mold 2 to move downward again. The upper moving mold 2 stamps and forges the piston blank again. Repeat this process to forge the piston blank multiple times to improve the quality of the prepared engine piston.

[0047] Embodiment 2: On the basis of Embodiment 1, a heating mechanism is also disclosed. The specific structure is as follows: A heating mechanism for heating the fixed mold 5 and the piston blank to increase the forging temperature is also provided on the convex platform 3; The heating mechanism includes a turntable 15 rotatably installed outside the convex platform 3. A main heating component for heating the side of the fixed mold 5 is provided on the turntable 15. A secondary heating component for directly heating the piston blank by moving is provided on the main heating component. And an auxiliary heating component for heating the bottom of the fixed mold 5 or the piston blank is also provided on the turntable 15.

[0048] The main heating component includes a plurality of fixed brackets 16 fixed on the turntable 15 at equal angles. A fixed burner 17 is fixedly installed on the fixed brackets 16.

[0049] The secondary heating component includes a sliding ring 18 slidably sleeved on the fixed brackets 16. A lifting frame 19 is fixedly installed on the sliding ring 18. A plurality of moving brackets 20 are fixed on the lifting frame 19 at equal angles. A moving burner 21 is fixedly installed on the moving brackets 20; The moving burner 21 and the fixed burner 17 are circumferentially spaced apart.

[0050] On the upper end face of the turntable 15, two mounting brackets 22 are symmetrically fixed about the axis. A transverse bracket 23 is slidably connected to the mounting bracket 22, and a bottom burner 24 is fixedly installed on the transverse bracket 23; the bottom burner 24 is correspondingly arranged on the lower end face of the fixed mold 5.

[0051] A guiding slide frame 25 is fixedly installed on the upper surface of the turntable 15. A lead screw 26 is rotatably connected between the guiding slide frame 25 and the turntable 15. An internally threaded column 27 is sleeved on the external thread of the lead screw 26, and a cross bar 29 is fixedly connected to the outside of the internally threaded column 27; a sleeve 28 is obliquely slidably sleeved on the outside of the guiding slide frame 25, and the sleeve 28 is slidably sleeved on the outside of the cross bar 29; a longitudinal rod 30 is fixedly connected to the outside of the transverse bracket 23, and a transmission bracket 31 is slidably sleeved on the outside of the longitudinal rod 30. The transmission bracket 31 is fixedly connected to the sleeve 28.

[0052] An internal gear ring 33 is fixedly connected to the outside of the convex platform 3 through a connecting frame 32; a supporting bracket 34 is fixedly installed on the lower surface of the turntable 15, a motor 35 is fixedly installed on the supporting bracket 34, a driving gear 36 is connected to the output end of the motor 35, the driving gear 36 is meshed with the internal gear ring 33, and the driving gear 36 is coaxially connected with the lead screw 26.

[0053] During the forging process, the fixed burner 17 and the movable burner 21 are both correspondingly on the outer side of the fixed mold 5, and the bottom burner 24 is correspondingly at the bottom of the fixed mold 5. Combustion gas is controlled by a metal bellows to enter the fixed burner 17, the movable burner 21 and the bottom burner 24 to maintain continuous combustion heating, and the temperature of the fixed mold 5 is controlled by heating, so as to maintain the forging temperature of the piston blank in the fixed mold 5.

[0054] After the piston blank is pushed by the ejector rod 8 to move upward and demold from the stationary mold 5, the motor 35 is operated to control the rotation of the lead screw 26. The lead screw 26 is threadedly connected to the internal thread column 27. Under the thread drive, the internal thread column 27 moves longitudinally. The internal thread column 27 drives the lifting frame 19 to move longitudinally synchronously. The sliding ring 18 on the side of the lifting frame 19 is sleeved outside the fixed bracket 16 and moves upward. The lifting frame 19 drives the moving bracket 20 and the moving burner 21 to move upward, so that the moving burner 21 corresponds to the outside of the piston blank after moving upward. At the same time, when the internal thread column 27 moves upward, the cross bar 29 fixed to its side moves synchronously. The cross bar 29 controls the sleeve 28 to slide obliquely outside the guiding slide frame 25, and the sleeve 28 also slides horizontally outside the cross bar 29. The transmission bracket 31 fixed to the side of the sleeve 28 moves synchronously. The transmission bracket 31 is sleeved outside the vertical rod 30 and slides. And the transmission bracket 31 controls the horizontal bracket 23 to penetrate and slide inside the mounting frame 22 through the vertical rod 30, so as to achieve the purpose of driving the horizontal bracket 23 and the bottom burner 24 to move, making the bottom burner 24 move between the stationary mold 5 and the downward moving lower moving mold 7. The bottom burner 24 moves to the center mold cavity position of the stationary mold 5, and it is correspondingly arranged below the piston blank, which can heat-treat the inner side wall of the stationary mold 5 and the bottom of the piston blank. Through the fixed burner 17, the moving burner 21 and the bottom burner 24, the stationary mold 5 and the piston blank are heat-treated in sections, improving the forging temperature of the piston blank, avoiding too large temperature difference between the piston blank and the mold, and at the same time keeping the internal stress of the piston blank uniform and improving the forging quality.

[0055] While the lead screw 26 rotates, it drives the driving gear 36 to rotate. The driving gear 36 is meshed and connected with the internal gear ring 33. Under the meshing drive, the driving gear 36 rotates along the circumferential direction of the internal gear ring 33. The driving gear 36 controls the turntable 15 installed on the convex platform 3 to rotate, so that the fixed burner 17, the moving burner 21 and the bottom burner 24 can rotate circumferentially, further maintaining the uniformity of the heat treatment.

[0056] An engine piston forging device also discloses a forging process, and the specific process steps are as follows:

[0057] S1. Combine the molds, control the lower moving mold 7 and the ejector rod 8 to move in the opposite direction, close the lower end of the stationary mold 5, place the piston blank in the stationary mold 5, and hydraulically drive the upper moving mold 2 to move downward. The upper moving mold 2 stamping-forges the piston blank in the stationary mold 5.

[0058] S2. Forging heating, during the forging process, heat the outside and bottom of the stationary mold 5 through the fixed burner 17, the moving burner 21 and the bottom burner 24 respectively to maintain the forging temperature of the piston blank inside the stationary mold 5.

[0059] S3. Automatically demold and forge multiple times. Control the upper moving die 2 to move upward, then control the lower moving die 7 and the ejector rod 8 to move in the reverse direction. The ejector rod 8 pushes the piston blank in the fixed die 5 to move upward for demolding, and forge multiple times to provide forging accuracy.

[0060] S4. Segmentally heat. Fix the burner 17 to heat the outside of the fixed die 5, move the burner 21 upward to heat the piston blank, and move the bottom burner 24 to heat the bottom of the piston blank. Segmental heating increases the forging temperature, thereby improving the plasticity of the piston blank and reducing the deformation resistance.

[0061] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An engine piston forging device, comprising a forging machine (1) and an upper moving die (2) that moves up and down in the forging machine (1) driven by hydraulic pressure, characterized in that: A boss (3) coaxially distributed with the upper moving die (2) is fixedly installed on the forging machine (1). The upper end surface of the boss (3) is fixedly installed with a fixed die (5) through a fixing column (4). A moving cylinder (6) is slidably connected to the boss (3) along the axial direction. The upper end surface of the moving cylinder (6) is fixedly installed with a lower moving die (7) which is snap-fitted and connected to the lower part of the fixed die (5). A ejector rod (8) is slidably connected to the lower moving die (7) along the axial direction. A driving mechanism for synchronously controlling the reverse movement of the lower moving die (7) and the ejector rod (8) is arranged in the boss (3). The driving mechanism includes a guiding column (9) fixed to the bottom of the boss (3). The ejector rod (8) is connected through the upper part of the guiding column (9). A clamping strip (10) is fixedly installed on the outer part of the ejector rod (8). The clamping strip (10) is snap-fitted and slidably installed in the guiding column (9). A transmission gear (11) is rotatably connected in the boss (3). One side of the transmission gear (11) is meshed and connected with a driving rack (12). The driving rack (12) is fixed on the inner side wall of the moving cylinder (6). The other side of the transmission gear (11) is meshed and connected with a driven rack (13). The driven rack (13) is fitted and fixed on the outer side wall of the ejector rod (8). A heating mechanism for heating the fixed die (5) and the piston blank to increase the forging temperature is further arranged on the boss (3). The heating mechanism includes a turntable (15) rotatably installed outside the boss (3). A main heating component for heating the side surface of the fixed die (5) is arranged on the turntable (15). A secondary heating component for moving and directly heating the piston blank is arranged on the main heating component. An auxiliary heating component for heating the bottom surface of the fixed die (5) or the piston blank is further arranged on the turntable (15). The main heating component includes a plurality of fixed brackets (16) fixed on the turntable (15) at equal angles. A fixed burner (17) is fixedly installed on the fixed brackets (16). The secondary heating component includes a sliding ring (18) slidably sleeved on the fixed brackets (16). A lifting frame (19) is fixedly installed on the sliding ring (18). A plurality of moving brackets (20) are fixed on the lifting frame (19) at equal angles. A moving burner (21) is fixedly installed on the moving brackets (20). The moving burner (21) and the fixed burner (17) are distributed at circumferential intervals. Two mounting frames (22) are symmetrically fixed on the upper end surface of the turntable (15) with respect to the axis. A transverse bracket (23) is slidably connected to the mounting frames (22). A bottom burner (24) is fixedly installed on the transverse bracket (23). The bottom burner (24) is correspondingly arranged at the lower end surface of the fixed die (5). A guiding slide carriage (25) is fixedly mounted on the upper surface of the turntable (15). A lead screw (26) is rotatably connected between the guiding slide carriage (25) and the turntable (15). An internally threaded column (27) is sleeved on the external thread of the lead screw (26). A cross bar (29) is fixedly connected to the outside of the internally threaded column (27). An outer sleeve (28) is obliquely and slidably sleeved on the outside of the guiding slide carriage (25), and the outer sleeve (28) is slidably sleeved on the outside of the cross bar (29). A longitudinal rod (30) is fixedly connected to the outside of the transverse support (23). A transmission support (31) is slidably sleeved on the outside of the longitudinal rod (30), and the transmission support (31) is fixedly connected to the outer sleeve (28).

2. An engine piston forging device according to claim 1, characterized in that: A side groove (14) is formed on the outer side of the upper part of the guiding column (9). A transmission gear (11) is disposed through the side groove (14), and the position of the driven rack (13) corresponds to that of the side groove (14).

3. An engine piston forging device according to claim 1, characterized in that: An internal gear ring (33) is fixedly connected to the outside of the boss (3) through a connecting frame (32). A supporting bracket (34) is fixedly mounted on the lower surface of the turntable (15). A motor (35) is fixedly mounted on the supporting bracket (34). A driving gear (36) is connected to the output end of the motor (35). The driving gear (36) is meshed with the internal gear ring (33), and the driving gear (36) is coaxially connected with the lead screw (26).

4. An engine piston forging device according to any one of claims 1-3, characterized in that, A forging process is also disclosed, and the specific process steps are as follows: S1. Assemble the die. Control the lower moving die (7) and the ejector rod (8) to move in the reverse direction, close the lower end of the fixed die (5), place the piston blank in the fixed die (5), and hydraulically drive the upper moving die (2) to move downward. The upper moving die (2) stamping-forges the piston blank in the fixed die (5). S2. Forging heating. During the forging process, heat the outside and bottom of the fixed die (5) respectively through the fixed burner (17), the movable burner (21) and the bottom burner (24) to maintain the forging temperature of the piston blank inside the fixed die (5). S3. Automatic demoulding and multi-stage forging. Control the upper moving die (2) to move upward, then control the lower moving die (7) and the ejector rod (8) to move in the reverse direction. The ejector rod (8) pushes the piston blank in the fixed die (5) to move upward for demoulding, and perform multi-stage forging to provide forging accuracy. S4. Segmented heating. The fixed burner (17) heats the outside of the fixed die (5), the movable burner (21) moves upward to heat the piston blank, and the bottom burner (24) moves to heat the bottom of the piston blank. The segmented heating increases the forging temperature, thereby improving the plasticity of the piston blank and reducing the deformation resistance.

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