Engine piston forging equipment and forging process

Abstract

The invention discloses engine piston forging equipment and a forging process, and belongs to the technical field of engine piston forging machine.The engine piston forging equipment and the forging process comprise a forging machine and an upper movable die driven by hydraulic pressure to move up and down in the forging machine; a boss coaxially distributed with the upper movable die is fixedly installed on the forging machine, a fixed die is fixedly installed on the upper end face of the boss through a fixing column, a movable cylinder is slidably connected to the boss in the axis direction, and a lower movable die connected with the lower portion of the fixed die in a clamped mode is fixedly installed on the upper end face of the movable cylinder. An ejector rod is connected in the lower movable mold in a sliding manner along the axis direction; the boss is further provided with a heating mechanism used for heating the fixed die and the piston blank so as to increase the forging temperature. The piston blank can be forged for multiple times through the upper movable die, the fixed die and the lower fixed die which are combined, the piston blank can be heated in a segmented mode, and the forging quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine piston forging processing, in particular to an engine piston forging device and a forging process. Background Art

[0002] Engine piston forging equipment is a key equipment used to manufacture high-performance engine pistons. It forms a piston with a specific shape and performance through the action of pressure and temperature on metal materials. The forged piston surface is more wear-resistant and durable, and the internal structure is uniform and dense, which can improve the strength and durability of the piston.

[0003] For example, the patent with publication number CN219703364U discloses a compressor piston forging die, which includes a die box, a mounting plate is slidably assembled inside the die box, a lower die seat is bolted to the upper end face of the mounting plate, a die cavity is formed in the middle of the lower die seat, the upper end face of the mounting plate is fixedly connected to the support plate through a plurality of support rods, a cylinder is mounted on the upper end face of the support plate, a lifting plate is fixedly connected to the output end of the cylinder, an upper die seat is bolted to the bottom of the lifting plate, after the die is opened, the pusher block is driven to move upward by the ejection assembly, the pusher block ejects the piston forging part, thereby facilitating personnel to take out the piston forging part, and avoiding the piston forging part being adsorbed in the die cavity of the lower die seat and making it difficult for personnel to take it out.

[0004] For example, the patent with publication number CN110576135B discloses a multi-faceted forging device, including a bracket, 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 on the middle part 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 lateral pressure cylinder is fixed on the forging rib rod, and a lateral pressure rod is fixed on the piston shaft of the lateral pressure cylinder. The forging processing of multiple faces is completed in the same forging lower die, and they will not affect each other during forging, thereby improving the forging efficiency and forging accuracy, and having strong applicability and good practicality.

[0005] Another example is the patent with publication number CN213645751U which discloses a hydraulic forging device for forging metal parts, comprising a mounting table, a first acting cylinder and a second acting cylinder are connected to the upper surface of the mounting table through a plurality of connecting rods, the first acting cylinder and the second acting cylinder are connected, the bottoms of the first acting cylinder and the second acting cylinder are respectively penetrated and 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; an electric push rod is used to drive the pushing table to move, the pushing table contacts with 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 distance moved by the forging hammer is equal to the distance moved by the pushing table The distance moved by the forging hammer can be controlled by controlling the distance moved by the piston end of the electric push rod, so that workpieces of different thicknesses can be forged, which improves the practicability of the device. The pistons of some large engines are large in size, and the piston blanks are cylindrical structures. The precision of one forging process is low during the forging process. After multiple forgings, the temperature difference between the blank and the mold gradually decreases, and the surface temperature of the mold will rise rapidly, resulting in increased friction between the mold and the blank, thereby increasing the wear on the mold surface, especially at the convex or arc-shaped protrusions of the mold. In addition, the internal stress distribution of the forging is uneven, which can easily cause uneven deformation of the forging and affect the forging quality.

[0006] In view of the above problems, it is urgent to carry out innovative design based on 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 forging process to solve the problems raised in the above background technology that the accuracy of one-time forging processing is low, the temperature difference between the blank and the die gradually decreases after multiple forgings, the friction between the die and the blank is aggravated, and uneven deformation of the forging is easily caused.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an engine piston forging equipment and forging process, comprising a forging machine and an upper movable die that is driven by hydraulic pressure to move up and down in the forging machine, the forging machine is fixedly provided with a boss that is coaxially distributed with the upper movable die, the upper end surface of the boss is fixedly provided with a fixed die through a fixed 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 provided with a lower movable die that is engaged with the lower side of the fixed die, and an ejector rod is slidably connected to the lower movable die along the axial direction; a driving mechanism for synchronously controlling the reverse movement of the lower movable die and the ejector rod is arranged in the boss; a heating mechanism for heating the fixed die and the piston blank to increase the forging temperature is also arranged on the boss.

[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 meshedly connected to an active rack, the active rack is fixed to the inner side wall of the moving cylinder, and the other side of the transmission gear is meshedly connected to a driven rack, and the driven rack is embedded and 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 penetrated and arranged in 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 arranged on the turntable, a secondary heating component for directly heating the piston blank is arranged on the main heating component, and an auxiliary heating component for heating the bottom of the fixed mold or the piston blank is also arranged on the turntable.

[0012] Preferably, the main heating assembly comprises a plurality of fixed brackets fixed at equal angles on the turntable, and a fixed burner is 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 frames are fixed symmetrically on the upper end surface of the turntable about the axis, a transverse bracket is slidably connected to the mounting frame, 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 mounted on the upper surface of the turntable, a screw is rotatably connected between the guide slide and the turntable, an external threaded sleeve of the screw is provided with an internal threaded column, and the outside of the internal threaded column is fixedly connected with a cross bar; the external oblique sliding sleeve of the guide slide is provided with a sleeve, and the sleeve sliding sleeve is arranged on the outside of the cross bar; the outside of the transverse bracket is fixedly connected with a longitudinal rod, 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 via a connecting frame; a supporting frame is fixedly installed on the lower surface of the turntable, a motor is fixedly installed on the supporting frame, the output end of the motor is connected to a driving gear, the driving gear is meshingly connected to the inner gear ring, and the driving gear is coaxially connected to the screw rod.

[0017] An engine piston forging device and a forging process are disclosed. The specific process steps are as follows: S1. Combine the molds, control the lower movable mold and the ejector rod to move in opposite directions, close the lower end of the fixed mold, place the piston blank in the fixed mold, hydraulically drive the upper movable mold to move downward, and the upper movable mold punches and forges the piston blank in the fixed mold.

[0018] S2. Forging heating: During the forging process, the outer side and the bottom of the fixed die are heated respectively by the fixed burner, the movable burner and the bottom burner to maintain the forging temperature of the piston blank inside the fixed die.

[0019] S3, automatic demoulding, multiple forging, control the upper movable die to move upward, and then control the lower movable die and the ejector rod to move in the opposite direction. The ejector rod pushes the piston blank in the fixed die to move upward and demould, and multiple forgings are performed to provide forging accuracy.

[0020] S4, segmented heating, the fixed burner heats the outside of the fixed mold, the mobile burner moves upward to heat the piston blank, and the bottom burner moves to heat the bottom of the piston blank. Segmented heating increases the forging temperature, thereby improving the plasticity of the piston blank and reducing deformation resistance.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the engine piston forging equipment continuously and multiple times forges the piston blank through the combined upper movable die, fixed die, lower movable die and ejector rod, and heats the piston blank and the fixed die in sections to improve the forging quality.

[0022] Furthermore, a driving mechanism for synchronously controlling the reverse movement of the lower movable die and the ejector rod is provided in the boss. When controlling the movement of the lower movable die, the ejector rod and the lower movable die can be controlled to move in the reverse direction under the meshing transmission of the active rack, the transmission gear and the driven rack, thereby quickly pushing the piston blank in the fixed die up for demolding, so as to facilitate multiple forging processes on it, and also facilitate the heating treatment of the piston blank.

[0023] Furthermore, a heating mechanism is provided on the boss for heating the fixed die and the piston blank to increase the forging temperature. The heating mechanism includes a main heating component, a sub-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 movable burner in the sub-heating component can be moved to heat the piston blank, and the auxiliary burner can be moved to heat the bottom of the piston blank.

[0024] The screw rod is controlled to rotate, and the internal thread column is controlled to move upward under the thread transmission. The internal thread column drives the mobile burner to move upward through the lifting frame to adjust the heating position of the mobile burner. At the same time, the internal thread column drives the sleeves on both sides to move obliquely. The sleeve controls the lateral movement of the bottom burner through the transmission bracket to adjust the heating position of the bottom burner, so as to better heat the fixed die and the piston blank in sections at different stages of forging processing.

[0025] When the control screw rotates, the screw drives the driving gear to rotate synchronously. The driving gear is meshed with the inner gear ring, so that the driving gear can rotate along the circumferential direction of the inner gear ring. The driving gear drives the turntable to rotate on the boss, so that the fixed burner, the movable burner and the bottom burner rotate in a circle, thereby expanding the heating range and improving the heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the forging machine of the present invention.

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the turntable of the present invention.

[0028] Figure 3 It is a schematic diagram of the three-dimensional structure of the boss of the present invention.

[0029] Figure 4 It is a schematic diagram of the fixed mold cross-section structure of the present invention.

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of the transmission gear of the present invention.

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixed burner of the present invention.

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure of the mobile burner of the present invention.

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of the bottom burner of the present invention.

[0034] Fig. 9 It is a schematic diagram of the three-dimensional structure of the lifting frame of the present invention.

[0035] Fig.10 It is a schematic diagram of the three-dimensional structure of the transmission bracket of the present invention.

[0036] Fig.11 It is a schematic diagram of the three-dimensional structure of the screw rod of the present invention.

[0037] Fig.12 It is a schematic diagram of the three-dimensional structure of the inner gear ring of the present invention.

[0038] Fig.13 It is a schematic diagram of the three-dimensional structure of the driving gear of the present invention.

[0039] In the figure: 1, forging machine; 2, upper movable die; 3, boss; 4, fixed column; 5, fixed die; 6, moving cylinder; 7, lower movable die; 8, ejector rod; 9, guide column; 10, clamping strip; 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 rod; 27, internal thread column; 28, sleeve; 29, cross bar; 30, longitudinal bar; 31, transmission bracket; 32, connecting frame; 33, internal gear ring; 34, supporting frame; 35, motor; 36, driving gear. DETAILED DESCRIPTION

[0040] 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.

[0041] Example 1: Please refer to Figure 1-Figure 13 The present invention provides the following technical solutions: an engine piston forging device and a 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 installed on the forging machine 1, a fixed die 5 is fixedly installed on the upper end surface of the boss 3 through a fixed column 4, and a moving cylinder 6 is slidably connected to the boss 3 along the axial direction, a lower movable die 7 engaged with the lower part of the fixed die 5 is fixedly installed on the upper end surface of the moving 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.

[0042] The driving mechanism includes a guide column 9 fixed at the bottom of the boss 3, an ejector rod 8 is connected through 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 slidably installed in the guide column 9; a transmission gear 11 is rotatably connected in the boss 3, one side of the transmission gear 11 is meshed with an active rack 12, the active rack 12 is fixed on the inner wall of the moving cylinder 6, and the other side of the transmission gear 11 is meshed with a driven rack 13, and the driven rack 13 is fixed on the outer wall of the ejector rod 8.

[0043] A side groove 14 is formed on the upper outer side of the guide column 9 , and the transmission gear 11 is penetrated and arranged in the side groove 14 . The position of the driven rack 13 corresponds to the position of the side groove 14 .

[0044] The piston blank after heat treatment is placed in the fixed die 5, the lower movable die 7 and the ejector rod 8 are blocked at the lower end of the fixed die 5, and the upper movable die 2 is controlled to move downward by the hydraulic driving force. The upper movable die 2 is stamped on the surface of the piston blank to shape the piston blank by pressure. After one stamping and forging, the upper movable die 2 is controlled to move upward and separate from the piston blank. The hydraulic rod in the operating boss 3 controls the moving cylinder 6 to move downward, and the moving cylinder 6 drives the lower movable die 7 to move downward synchronously. The inner wall of the lower movable die 7 is The active rack 12 meshes with the side of the transmission gear 11 and moves downward. The transmission gear 11 is controlled to rotate through the meshing transmission. The rotating transmission gear 11 pushes the driven rack 13 to move upward through the meshing transmission. The driven rack 13 drives the ejector rod 8 to move upward. The ejector rod 8 is connected to the guide column 9 through the clamping strip 10 and moves upward. The ejector rod 8 pushes the piston blank in the fixed mold 5 to move up and demold. After demolding, the piston blank and the fixed mold 5 are heated in sections to quickly control the temperature rise of the piston blank.

[0045] Then, the movable cylinder 6 and the lower movable die 7 are controlled to move upward, and the ejector rod 8 is controlled to move downward under the meshing transmission of the active rack 12, the transmission gear 11 and the driven rack 13, so that the lower movable die 7 and the ejector rod 8 are re-sealed at the bottom of the fixed die 5, and the piston blank re-enters the fixed die 5 under the action of gravity, and the upper movable die 2 is controlled to move downward again, and the upper movable die 2 stamps and forges the piston blank again, and this reciprocating process is repeated for the piston blank to improve the quality of the engine piston.

[0046] Embodiment 2: Based on Embodiment 1, a heating mechanism is also disclosed, and its specific structure is as follows: a heating mechanism for heating the fixed die 5 and the piston blank to increase the forging temperature is also provided on the boss 3; the heating mechanism includes a turntable 15 rotatably installed on the outside of the boss 3, the turntable 15 is provided with a main heating component for heating the side of the fixed die 5, the main heating component is provided with a secondary heating component for directly heating the piston blank, and the turntable 15 is also provided with an auxiliary heating component for heating the bottom of the fixed die 5 or the piston blank.

[0047] The main heating assembly includes a plurality of fixed brackets 16 fixed at equal angles on a turntable 15 , and a fixed burner 17 is fixedly mounted on the fixed brackets 16 .

[0048] The auxiliary heating assembly includes a slip ring 18 slidably mounted on a fixed bracket 16, a lifting bracket 19 is fixedly mounted on the slip ring 18, a plurality of mobile brackets 20 are fixed at equal angles on the lifting bracket 19, and a mobile burner 21 is fixedly mounted on the mobile bracket 20; the mobile burner 21 is distributed circumferentially with the fixed burner 17 at intervals.

[0049] Two mounting frames 22 are fixed symmetrically on the upper end surface of the turntable 15 about the axis, and a transverse bracket 23 is slidably connected to the mounting frame 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 surface of the fixed mold 5.

[0050] A guide slide 25 is fixedly installed on the upper surface of the turntable 15, and a screw rod 26 is rotatably connected between the guide slide 25 and the turntable 15. The external thread sleeve of the screw rod 26 is provided with an internal thread column 27, and the outside of the internal thread column 27 is fixedly connected with a cross bar 29; the external oblique sliding sleeve of the guide slide 25 is provided with a sleeve 28, and the sleeve 28 is slidably sleeved on the outside of the cross bar 29; the outside of the transverse bracket 23 is fixedly connected with a longitudinal rod 30, and the external sliding sleeve of the longitudinal rod 30 is provided with a transmission bracket 31, and the transmission bracket 31 is fixedly connected to the sleeve 28.

[0051] The outside of the boss 3 is fixedly connected to an inner gear ring 33 via a connecting frame 32; a support bracket 34 is fixedly installed on the lower surface of the turntable 15, and a motor 35 is fixedly installed on the support bracket 34. The output end of the motor 35 is connected to a driving gear 36, which is meshed and connected to the inner gear ring 33, and the driving gear 36 is coaxially connected to the screw rod 26.

[0052] During the forging process, the fixed burner 17 and the movable burner 21 correspond to the outer side surface of the fixed mold 5, and the bottom burner 24 corresponds to the bottom end of the fixed mold 5. The combustion gas is controlled to enter the fixed burner 17, the movable burner 21 and the bottom burner 24 through the metal bellows to maintain continuous combustion heating, and the temperature of the fixed mold 5 is controlled by heating, thereby maintaining the forging temperature of the piston blank in the fixed mold 5.

[0053] After the piston blank is pushed up and demolded from the movable fixed mold 5 by the ejector rod 8, the operating motor 35 controls the screw rod 26 to rotate, the screw rod 26 is threadedly connected with the internal thread column 27, the internal thread column 27 moves longitudinally under the thread transmission, and the internal thread column 27 drives the lifting frame 19 to move longitudinally synchronously, and the slip ring 18 on the side of the lifting frame 19 is sleeved on the outside of the fixed bracket 16 and moves upward, and the lifting frame 19 drives the movable bracket 20 and the movable burner 21 to move upward, so that the movable burner 21 corresponds to the outer side of the piston blank after the upward movement. At the same time, when the internal thread column 27 moves upward, the cross bar 29 fixed on its side moves synchronously, and the cross bar 29 controls the sleeve 28 sleeved on the outside of the guide slide 25 to slide obliquely, and the sleeve 28 sleeved on the outside of the cross bar 29 slides laterally, and the transmission bracket 31 fixed on the side of the sleeve 28 Synchronously move, the transmission bracket 31 is sleeved on the outside of the longitudinal rod 30 and slides, and the transmission bracket 31 controls the transverse bracket 23 through the longitudinal rod 30 to slide inside the mounting frame 22, thereby achieving the purpose of driving the transverse bracket 23 and the bottom burner 24 to move, so that the bottom burner 24 moves to between the fixed mold 5 and the downward moving lower mold 7, and the bottom burner 24 moves to the center mold cavity position of the fixed mold 5, which is correspondingly arranged below the piston blank, and can heat the inner wall of the fixed mold 5 and the bottom of the piston blank. The fixed mold 5 and the piston blank are heat-treated in sections by the fixed burner 17, the movable burner 21 and the bottom burner 24, so as to increase the forging temperature of the piston blank, avoid excessive temperature difference between the piston blank and the mold, and keep the internal stress of the piston blank uniform, thereby improving the forging quality.

[0054] As the screw rod 26 rotates, it also drives the driving gear 36 to rotate. The driving gear 36 is meshed with the inner gear ring 33. Under the meshing transmission, the driving gear 36 rotates along the circumferential direction of the inner gear ring 33. The driving gear 36 controls the rotation of the turntable 15 installed on the boss 3, so that the fixed burner 17, the movable burner 21 and the bottom burner 24 can rotate in a circle, further maintaining the uniformity of the heat treatment.

[0055] An engine piston forging device and a forging process are disclosed. The specific process steps are as follows: S1, assemble the mold, control the lower movable mold 7 and the ejector rod 8 to move in opposite directions, close the lower end of the fixed mold 5, place the piston blank in the fixed mold 5, hydraulically drive the upper movable mold 2 to move downward, and the upper movable mold 2 stamps and forges the piston blank in the fixed mold 5.

[0056] S2, forging heating. During the forging process, the fixed burner 17, the movable burner 21 and the bottom burner 24 are used to heat the outer side and the bottom of the fixed mold 5 respectively, so as to maintain the forging temperature of the piston blank inside the fixed mold 5.

[0057] S3, automatic demoulding, multiple forging, control the upper movable mold 2 to move upward, and then control the lower movable mold 7 and the ejector rod 8 to move in the opposite direction, the ejector rod 8 pushes the piston blank in the fixed mold 5 to move upward and demould, multiple forging, to provide forging accuracy.

[0058] S4, segmented heating, the fixed burner 17 heats the outside of the fixed mold 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.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine piston forging device, 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), characterized in that: The forging machine (1) is fixedly provided with a boss (3) coaxially distributed with the upper movable die (2); a fixed die (5) is fixedly provided on the upper end surface of the boss (3) via a fixed column (4); 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 provided on the upper end surface of the movable cylinder (6); an ejector rod (8) is slidably connected to the lower movable die (7) along the axial direction; The boss (3) is provided with a driving mechanism for synchronously controlling the reverse movement of the lower movable mold (7) and the ejector rod (8); The boss (3) is also provided with a heating mechanism for heating the fixed die (5) and the piston blank to increase the forging temperature.

2. The engine piston forging equipment according to claim 1, characterized in that: The driving mechanism comprises a guide column (9) fixed to the bottom of the boss (3), an ejector rod (8) passing through and connected above the guide column (9), and a clamping strip (10) is fixedly mounted on the outside of the ejector rod (8), and the clamping strip (10) is slidably mounted in the guide column (9); The boss (3) is rotatably connected to a transmission gear (11), one side of the transmission gear (11) is meshedly connected to an active rack (12), the active rack (12) is fixed to the inner wall of the moving cylinder (6), and the other side of the transmission gear (11) is meshedly connected to a driven rack (13), the driven rack (13) is embedded and fixed to the outer wall of the ejector rod (8).

3. The engine piston forging equipment according to claim 2, characterized in that: A side groove (14) is provided on the upper outer side of the guide column (9), the transmission gear (11) is arranged through the side groove (14), and the position of the driven rack (13) corresponds to the position of the side groove (14).

4. The engine piston forging equipment according to claim 1, characterized in that: The heating mechanism comprises a turntable (15) rotatably mounted on the outside of the boss (3); a main heating component for heating the side of the fixed mold (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; and an auxiliary heating component for heating the bottom of the fixed mold (5) or the piston blank is also arranged on the turntable (15).

5. The engine piston forging equipment according to claim 4, characterized in that: The main heating component comprises a plurality of fixed brackets (16) fixed at equal angles on a turntable (15), and a fixed burner (17) is fixedly mounted on the fixed brackets (16).

6. The engine piston forging equipment according to claim 5, characterized in that: The auxiliary heating assembly comprises a slip ring (18) slidably mounted on a fixed bracket (16); a lifting bracket (19) is fixedly mounted on the slip ring (18); a plurality of movable brackets (20) are fixedly mounted at equal angles on the lifting bracket (19); and a movable burner (21) is fixedly mounted on the movable bracket (20); The movable burner (21) and the fixed burner (17) are distributed at intervals around the circumference.

7. The engine piston forging equipment according to claim 6, characterized in that: Two mounting frames (22) are fixed symmetrically on the upper end surface of the turntable (15) about the axis, a transverse bracket (23) is slidably connected to the mounting frame (22), and a bottom burner (24) is fixedly mounted on the transverse bracket (23); The bottom burner (24) is correspondingly arranged on the lower end surface of the fixed mold (5).

8. The engine piston forging equipment according to claim 7, characterized in that: A guide carriage (25) is fixedly mounted on the upper surface of the turntable (15); a screw rod (26) is rotatably connected between the guide carriage (25) and the turntable (15); an internal thread column (27) is provided on the external thread sleeve of the screw rod (26); and a cross rod (29) is fixedly connected to the external portion of the internal thread column (27); The guide slide (25) is obliquely slidably sleeved on the outside with a sleeve (28), and the sleeve (28) is slidably sleeved on the outside of the crossbar (29); The exterior of the transverse bracket (23) is fixedly connected to a longitudinal rod (30), and the exterior sliding sleeve of the longitudinal rod (30) is provided with a transmission bracket (31), and the transmission bracket (31) is fixedly connected to the sleeve (28).

9. The engine piston forging equipment according to claim 8, characterized in that: The outside of the boss (3) is fixedly connected to an inner gear ring (33) via a connecting frame (32); A support bracket (34) is fixedly mounted on the lower surface of the turntable (15), a motor (35) is fixedly mounted on the support bracket (34), an output end of the motor (35) is connected to a driving gear (36), the driving gear (36) is meshedly connected to the inner gear ring (33), and the driving gear (36) is coaxially connected to the lead screw (26).

10. An engine piston forging device according to any one of claims 1 to 9, characterized in that: The forging process is also disclosed, and the specific process steps are as follows: S1, assembling the mold, controlling the lower movable mold (7) and the ejector rod (8) to move in opposite directions, closing the lower end of the fixed mold (5), placing the piston blank in the fixed mold (5), hydraulically driving the upper movable mold (2) to move downward, and the upper movable mold (2) stamping and forging the piston blank in the fixed mold (5); S2, forging heating, during the forging process, the outer side and the bottom of the fixed die (5) are heated respectively by the fixed burner (17), the movable burner (21) and the bottom burner (24), so as to maintain the forging temperature of the piston blank inside the fixed die (5); S3, automatic demoulding, multiple forging, controlling the upper movable die (2) to move upward, and then controlling the lower movable die (7) and the ejector rod (8) to move in the opposite direction, the ejector rod (8) pushes the piston blank in the fixed die (5) to move upward and demould, multiple forging, to provide forging accuracy; S4, segmented heating, the fixed burner (17) heats the outside of the fixed mold (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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