A forming method for a car door hinge forging

Abstract

This invention discloses a forming method for a car door hinge forging, comprising: preheating and cleaning the surface of the forging bar stock, followed by high-temperature calcination; bending the calcined bar stock into a billet using step-by-step bending, and then subjecting the billet to high-pressure descaling to remove the oxide film on the surface of the billet material; performing initial forging and final forging on the obtained billet to obtain the shaped forging; wherein, during the initial and final forging processes, compressed air is used to blow away the oxide scale inside the forging die cavity, and a lubricant is sprayed onto the surface of the forging die groove; punching and trimming are performed on the shaped forging, followed by normalizing; and shot blasting is performed on the normalized shaped forging to obtain the final shaped product. The car door hinge prepared by the forming method provided by this invention not only improves its mechanical properties but also reduces machining costs, improves product assembly accuracy, and enables the hinge to meet the strength and position requirements of assembly.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and specifically to a method for forming a door hinge forging. Background Technology

[0002] Currently, the most common car door hinges on the market include cast hinges and forged hinges. Cast hinges, due to the numerous and difficult-to-precise processes involved in the molten metal forming process, suffer from inconsistent quality. Furthermore, cast products often exhibit defects such as loose structure, coarse grains, shrinkage cavities, sand holes, and air pockets, resulting in lower mechanical properties that fail to meet strength and service life requirements. In contrast, forged products generally have higher mechanical properties and surface quality, and can withstand greater impact forces and other heavy loads. Casting requires waiting for the molten metal to cool and solidify, resulting in high labor intensity for workers and making it suitable for small-batch production. Forging, on the other hand, involves direct pressing and can be mass-produced, making forgings more efficient than castings.

[0003] To prevent door hinges from cracking or breaking due to fatigue, which would affect their service life, a method for forging door hinges is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a forming method for a car door hinge forging, so as to solve the technical problem of low hinge structural performance caused by the existing car door hinge casting method.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0006] A method for forming a car door hinge forging, comprising the following specific steps:

[0007] Step 100: Preheat the forging bar stock and remove surface iron filings, then perform high-temperature calcination;

[0008] Step 200: The calcined bar stock is bent into billets in a step-by-step manner, and after billet formation, it undergoes high-pressure dephosphorization to remove the oxide film on the surface of the billet raw material.

[0009] Step 300: Perform initial forging and final forging on the obtained billet to obtain the formed forging;

[0010] In the initial and final forging processes, compressed air is used to blow away the oxide scale inside the forging die cavity, while lubricant is sprayed onto the surface of the forging die groove.

[0011] Step 400: Punch and trim the formed forgings, and then normalize the forgings;

[0012] Step 500: Shot blasting is performed on the normalized forging to obtain the final product.

[0013] As a preferred embodiment of the present invention, in step 100, the temperature for high-temperature calcination of the forging bar is controlled at 1100℃±20℃, and during the calcination process, a mixture of protective gas and oxygen is introduced into the vertical placement surface of the forging bar.

[0014] As a preferred embodiment of the present invention, the specific method for bending and forming the calcined bar stock in step 200 includes:

[0015] Step 201: Radial cutting or forging is performed on both ends of the calcined bar stock with a set axial length to form a protrusion at the end of the bar stock, wherein the length of the protrusion is greater than the length of the end forming structure of the target forging along the axial direction of the bar stock.

[0016] Step 202: Forge the center of the protrusion radially along the bar to form a groove, and then bend the main body of the bar to the target shape to obtain a billet with a protrusion at the end.

[0017] As a preferred embodiment of the present invention, the specific method for performing initial forging and final forging on a billet with protrusions at the ends includes:

[0018] Step 301: Set a primary forging cavity and a final forging cavity on the forging die, and set a hole or groove for installing the protrusion on the side of the primary forging cavity and the final forging cavity, so that after the billet is put into the primary forging cavity or the final forging cavity, the protrusion at the end of the billet can enter the hole or groove of the forging die.

[0019] Step 302: Perform preliminary forging on the billet in the forging die, while the protrusion undergoes guided deformation along the slots of the preliminary forging cavity to obtain the preliminary forging part;

[0020] Step 303: The upper and lower forging dies of the forging die are demolded once. Then, the protrusions at both ends of the initial forging are clamped by the transfer mechanism and the initial forging is transferred to the final forging cavity. Then, the upper and lower forging dies are closed again for forging to perform final forging on the initial forging in the final forging cavity.

[0021] As a preferred embodiment of the present invention, in step 301, the forgings placed in the initial forging cavity and the final forging cavity are arranged in a centrally symmetrical manner, and the transfer mechanism moves the initial forging in the initial forging cavity into the final forging cavity by flipping it 180°.

[0022] As a preferred embodiment of the present invention, it further includes an integrated forging and final forging device for performing both forging and final forging on a billet with protrusions at the ends, the integrated device comprising:

[0023] A base, wherein the base is provided with an assembly groove for mounting the lower forging die;

[0024] Four guide brackets are arranged around the assembly slot, and a guide groove that cooperates with the guide brackets is provided at the corner of the forging die.

[0025] A transfer mechanism is provided on both sides of the base. The transfer mechanism is used to clamp the protrusion from the slot when the upper forging die is separated from the lower forging die, and rotate the protrusion as the rotation axis, so that the initial forging in the initial forging cavity of the lower forging die enters the final forging cavity of the lower forging die.

[0026] As a preferred embodiment of the present invention, a connecting shaft is provided in the middle of the upper part of the forging die, the connecting shaft is movably connected to the output end of the press, and the connecting shaft can be displaced axially along the output end of the press;

[0027] The base is provided with a reciprocating drive mechanism, which is used to drive the upper forging die to perform a reciprocating action of contacting and separating from the lower forging die when the upper forging die is demolded from the forging die and the upper forging die is not detached from the guide bracket.

[0028] As a preferred embodiment of the present invention, the reciprocating drive mechanism includes a rotary locking assembly mounted on the top of the guide bracket and an eccentric actuating part connected to the rotary locking assembly;

[0029] The rotary locking assembly is used to connect the four corners of the upper forging die, and the eccentric actuating part is used to drive the rotary locking assembly to move up and down along the axial direction of the guide bracket, thereby causing the upper forging die to perform a reciprocating motion of contacting and separating from the lower forging die.

[0030] In a preferred embodiment of the present invention, the rotary locking assembly includes a sleeve rod mounted on the guide bracket along the axial direction of the guide bracket, and a rotating shaft rod mounted on the sleeve rod along the axial direction of the sleeve rod. A servo motor is disposed inside the sleeve rod, the bottom of the servo motor is connected to the inner bottom of the guide bracket, the output end of the servo motor is connected to the rotating shaft rod via a spline, and a pin is connected to the upper end of the rotating shaft rod, the pin being perpendicular to the rotating shaft rod. A spring is fitted on the body of the sleeve rod, one end of the spring is fixedly connected to the outer wall of the sleeve rod, and the other end of the spring is fixedly connected to the inner wall of the guide bracket.

[0031] In a preferred embodiment of the present invention, the servo motor is used to drive the rotating shaft to rotate, so that the pin contacts and locks or disengages from the upper forging die; the output end of the eccentric action part is connected to the bottom of the sleeve rod, and when the pin contacts and locks the upper forging die, it drives the sleeve rod, the rotating shaft rod and the pin to move up and down, thereby causing the upper forging die to perform a reciprocating motion of contacting and separating from the lower forging die.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The door hinge prepared by the method of this invention not only improves its mechanical properties, but also reduces machining costs, improves product assembly accuracy, and enables the hinge to meet the strength and position requirements of assembly. Attached Figure Description

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a forming method for a car door hinge forging according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the overall assembly structure of the forging upper die and forging lower die according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the reciprocating drive mechanism according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the mold surface of the forging upper die according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the mold surface of the forging lower die according to an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of a door hinge forging according to an embodiment of the present invention.

[0041] The labels in the diagram represent the following:

[0042] 1-Base; 2-Forging lower die; 3-Guide bracket; 4-Guide groove; 5-Eccentric moving part; 6-Preliminary forging cavity; 7-Final forging cavity; 8-Forging upper die; 9-Connecting shaft; 10-Reciprocating drive mechanism; 11-Rotary locking assembly;

[0043] 111-Sleeve rod; 112-Servo motor; 113-Rotating shaft; 114-Pin; 115-Spring. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figures 1 to 6 As shown, the present invention provides a method for forming a door hinge forging, including the following specific steps:

[0046] Step 100: Preheat the forging bar stock and remove surface iron filings, then perform high-temperature calcination;

[0047] Step 200: The calcined bar stock is bent into billets in a step-by-step manner, and after billet formation, it undergoes high-pressure dephosphorization to remove the oxide film on the surface of the billet raw material.

[0048] Step 300: Perform initial forging and final forging on the obtained billet to obtain the formed forging;

[0049] In the initial and final forging processes, compressed air is used to blow away the oxide scale inside the forging die cavity, while lubricant is sprayed onto the surface of the forging die groove.

[0050] Step 400: Punch and trim the formed forgings, and then normalize the forgings;

[0051] Step 500: Shot blasting is performed on the normalized forging to obtain the final product.

[0052] In the forming method of car door hinge forgings, the casting hinge uses cast materials, which are difficult to control precisely when forming liquid metal, resulting in unstable casting quality. The forging forming method in this invention can avoid the problems in the casting process to a certain extent, but it is still necessary to select the best raw materials for the forged car door hinge forgings.

[0053] This invention uses a low-alloy high-strength structural steel with a carbon content ≤0.2% as bar stock, which is forged into shape. This material not only possesses high strength, fatigue resistance, impact resistance, corrosion resistance, low-temperature resistance, wear resistance, weldability, and ease of processing, but is also widely used in bridges, vehicles, ships, buildings, pressure vessels, and special equipment. Furthermore, using Q355D steel as the material for door hinges not only improves their mechanical properties but also reduces machining costs, improves product assembly accuracy, and ensures that the hinges meet the strength and position requirements of the assembly.

[0054] In step 100:

[0055] (1) The calcination heating temperature is 1100℃±20℃, and it needs to be checked every hour;

[0056] (2) During calcination heating, overheating and rapid calcination are strictly prohibited, which may lead to severe surface oxidation. Therefore, during the calcination process, a mixture of protective gas and oxygen is introduced. The purpose of introducing a certain proportion of oxygen is to oxidize the impurities in the bar stock, while the added protective gas can meet the requirement of rapidly increasing the temperature and quickly heating the bar stock to the target forging temperature.

[0057] Since round materials exceeding the process temperature range are scrapped during calcination and heating, the purpose of introducing protective gas is to prevent the temperature from becoming too high; materials below or equal to the process temperature range are allowed to be reheated, and after cooling, they should be reheated in a concentrated manner, but no more than three heating cycles are allowed.

[0058] In the forging process:

[0059] One pre-forging strike generates 220 joules of energy, while one final forging strike generates 130 joules of energy.

[0060] The mold must be preheated before each forging, at a temperature of 250℃-300℃;

[0061] The initial forging temperature shall not be less than 1050℃. If an abnormality occurs during the production process and the initial forging temperature is insufficient, production shall be stopped and the forging shall be reheated. The same billet shall not be put into the furnace three times, otherwise it shall be scrapped.

[0062] During the forging process, the operator uses compressed air to blow away the oxide scale inside the mold cavity, and at the same time sprays lubricant onto the surface of the mold groove; the graphite emulsion for forging lubrication is prepared by adding 5-10 kg of water to 1 kg of graphite emulsion; the prepared graphite emulsion solution is poured into a pressure tank and stirred evenly with compressed air, and then set aside.

[0063] Furthermore, in existing forging processes, the cavities of the initial forging and final forging have slight differences in size and structure, such as length, area, and shape.

[0064] Initial forging (pre-forging) has a significant impact on forging quality, deformation capacity, and processing efficiency. Generally, the initial forging of a metal should exceed its grain boundary deformation to ensure that the material does not crack or stretch during forging. Furthermore, the initial forging should also consider factors such as the metal's chemical composition and grain size.

[0065] Controlling the final forging step has a significant impact on the properties and shape of metals. Generally, the final forging step should be higher than the recrystallization point of the metal to ensure proper deformation during forging. However, both excessively high and low final forging steps can negatively affect the metal's properties.

[0066] In general, both initial forging and final forging are influenced by the properties of the material and the forging process, requiring adjustments based on specific circumstances. Properly controlling these two parameters plays a crucial role in improving the efficiency of the forging process and optimizing the quality of forged products. The aim is to control the deformation of the forging during the forging process, thereby obtaining superior metallic properties.

[0067] Therefore, this invention proposes setting up a primary forging cavity and a final forging cavity in the same mold, and using the structural differences between the two cavities to perform secondary forging, thereby accurately controlling the deformation of the material during the forging process and obtaining better forging structural properties.

[0068] Since the initial forging and final forging in this invention need to be carried out in different cavities, it is necessary to transfer the forgings in the initial and final forging states. Therefore, the specific method for bending the calcined bar stock into a billet in step 200 of this invention includes:

[0069] Step 201: Radial cutting or forging is performed on both ends of the calcined bar stock with a set axial length to form a protrusion at the end of the bar stock, wherein the length of the protrusion is greater than the length of the end forming structure of the target forging along the axial direction of the bar stock.

[0070] Step 202: Forge the center of the protrusion radially along the bar to form a groove, and then bend the main body of the bar to the target shape to obtain a billet with a protrusion at the end.

[0071] Because existing forgings aim for complete integrity, they are typically forged entirely in a mold. Handling these forgings requires a robotic arm to reach into and clamp them. Obviously, for forgings that are relatively planar or lack ideal clamping points, this imposes limitations on their transfer. Therefore, a specially designed clamping structure is needed.

[0072] In this invention, the selection of bar stock is taken into consideration, and a support position or clamping point is provided at the bar stock stage to hold the forging after initial forging, so as to improve the transfer efficiency of the forging in the initial forging cavity and the final forging cavity. That is, a protrusion is provided at the end of the bar stock to guide the deformation of the bar stock and maintain the structural shape during the forging process. This can be achieved by welding or by cutting and forming using the structure of the bar stock itself.

[0073] The groove designed in the middle of the protrusion is to provide a clamping point to hold the forging in place, which is equivalent to the thread adjustment groove or bolt groove at the end of the bolt.

[0074] Specific methods for primary and final forging of billets with protrusions at the ends include:

[0075] Step 301: Set a primary forging cavity and a final forging cavity on the forging die, and set a hole or groove for installing the protrusion on the side of the primary forging cavity and the final forging cavity, so that after the billet is put into the primary forging cavity or the final forging cavity, the protrusion at the end of the billet can enter the hole or groove of the forging die.

[0076] Step 302: Perform preliminary forging on the billet in the forging die, while the protrusion undergoes guided deformation along the slots of the preliminary forging cavity to obtain the preliminary forging part;

[0077] Step 303: The upper and lower forging dies of the forging die are demolded once. Then, the protrusions at both ends of the initial forging are clamped by the transfer mechanism and the initial forging is transferred to the final forging cavity. Then, the upper and lower forging dies are closed again for forging to perform final forging on the initial forging in the final forging cavity.

[0078] In step 301, the forgings placed in the initial forging cavity and the final forging cavity are arranged in a centrally symmetrical manner, and the transfer mechanism rotates the initial forging in the initial forging cavity into the final forging cavity by flipping it 180°.

[0079] It also includes integrated equipment for primary and final forging. The integrated equipment includes:

[0080] Base 1, with an assembly slot for mounting the lower forging die 2;

[0081] Four guide brackets 3 are set around the assembly slot, and guide grooves 4 that cooperate with the guide brackets 3 are set at the corners of the forging die 2.

[0082] The transfer mechanism is set on both sides of the base 1. The transfer mechanism is used to clamp the protrusion from the hole groove when the upper forging die 8 is separated from the lower forging die 2, and rotate the protrusion as the rotation axis, so that the initial forging in the initial forging cavity 6 of the lower forging die 2 enters the final forging cavity 7 of the lower forging die 2.

[0083] The transfer mechanism is specifically a multi-degree-of-freedom robotic arm or robotic hand.

[0084] Furthermore, during the forging process, due to oxidation, oxide scale will still exist in the forging cavity. If the forging is directly transferred from the initial forging cavity to the final forging cavity, the oxide scale will adhere to the surface of the forging. When forging is performed again, the oxide scale will affect the surface forming of the forging.

[0085] For this purpose, a connecting shaft 9 is provided in the middle of the upper part of the forging die 8. The connecting shaft 9 is movably connected to the output end of the press, and the connecting shaft 9 can be displaced axially along the output end of the press.

[0086] A reciprocating drive mechanism 10 is provided on the base 1. The reciprocating drive mechanism 10 is used to drive the forging upper die 8 to perform reciprocating actions of contacting and separating from the forging lower die 2 when the forging upper die 8 and the forging lower die 2 are demolded in the press and the forging upper die 8 does not detach from the guide bracket 3.

[0087] That is, after the initial forging of the forging is completed, when the press raises the upper forging die to perform the demolding action, the forging is struck by the micro-distance contact vibration between the upper and lower forging dies, so that the oxide scale is removed from the forging. Then, during the transfer of the forging, the forging is flipped into the final forging cavity, so that the oxide scale is removed.

[0088] To better illustrate the above technical solution, the present invention provides a specific embodiment of a reciprocating drive mechanism 10, including a rotary locking assembly 11 mounted on the top of a guide bracket 3 and an eccentric actuating part 5 connected to the rotary locking assembly 11. The eccentric actuating part 5 is specifically a structure that converts eccentric rotation into linear motion, which is prior art and will not be described in detail in the present invention.

[0089] The rotary locking assembly 11 is used to connect the four corners of the upper forging die 8, and the eccentric action part 5 is used to drive the rotary locking assembly 11 to move up and down along the axial direction of the guide bracket 3, thereby causing the upper forging die 8 to perform reciprocating motions of contacting and separating from the lower forging die 2.

[0090] In this invention, the reciprocating drive mechanism 10 and the guide structure between the upper and lower forging dies are designed as an integrated whole, thereby avoiding excessive additional structures in the forging die that could affect the furnace heating process during normalizing of the forging.

[0091] Furthermore, the present invention provides a specific embodiment of the rotary locking assembly 11:

[0092] The system includes a sleeve rod 111 mounted on the guide bracket 3 along the axial direction of the guide bracket 3, and a rotating shaft rod 113 mounted on the sleeve rod 111 along the axial direction of the sleeve rod 111. A servo motor 112 is installed inside the sleeve rod 111. The bottom of the servo motor 112 is connected to the inner bottom of the guide bracket 3. The output end of the servo motor 112 is connected to the rotating shaft rod 113 via a spline. A pin 114 is connected to the upper end of the rotating shaft rod 113. The pin 114 is perpendicular to the rotating shaft rod 113. A spring 115 is fitted on the body of the sleeve rod 111. One end of the spring 115 is fixedly connected to the outer wall of the sleeve rod 111, and the other end of the spring 115 is fixedly connected to the inner wall of the guide bracket 3.

[0093] The servo motor 112 is used to drive the rotating shaft 113 to rotate, so that the pin 114 can engage with or disengage from the forging die 8.

[0094] The output end of the eccentric action unit 5 is connected to the bottom of the sleeve rod 111, and when the pin 114 contacts the locking forging upper die 8, it drives the sleeve rod 111, the rotating shaft rod 113 and the pin 114 to move up and down, causing the forging upper die 8 to perform a reciprocating action of contacting and separating from the forging lower die 2.

[0095] To further explain, the transfer action between the initial forging cavity and the final forging cavity in this invention can motivate the application of the mold in this invention to the forging of assembly line forgings. That is, after the initial forging in the initial forging cavity is transferred to the final forging cavity, the billet is randomly transferred from the outside into the initial forging cavity.

[0096] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A forming method of a vehicle door hinge forging, characterized by, The method comprises the following steps: Step 100, preheating and surface scale cleaning of the forging bar, and then high-temperature calcination; Step 200, bending and blanking of the calcined bar, and high-pressure dephosphorization after blanking to remove the oxide film on the surface of the blanking raw material; The specific method for bending and blanking of the calcined bar comprises: Step 201, radial cutting or forging of the ends of the calcined bar to set the axial length, forming protrusions at the ends of the bar, wherein the length of the protrusions is greater than the length of the end forming structure of the target forging in the axial direction of the bar; Step 202, forming a pressure groove in the middle of the protrusions by radial forging of the bar, and then bending the main body of the bar to obtain a blank with protrusions at the ends; Step 300, initial forging and final forging of the obtained blank to obtain a shaped forging; The specific method comprises: Step 301, setting an initial forging cavity and a final forging cavity on the forging die, and setting a hole groove for mounting the protrusions on the side of the initial forging cavity and the final forging cavity, so that after the blank is placed in the initial forging cavity or the final forging cavity, the protrusions at the ends of the blank can enter the hole groove of the forging die; Step 302, initial forging of the blank in the forging die, while the protrusions are guided to deform along the hole groove of the initial forging cavity, to obtain an initial forging; Step 303, one-time demolding of the forging upper die and the forging lower die of the forging die, then the protrusions at both ends of the initial forging are clamped by the transfer mechanism, and the initial forging is transferred to the final forging cavity, and then the forging upper die and the forging lower die are closed again for final forging of the initial forging in the final forging cavity; During the initial forging and final forging, the scale in the cavity of the forging die is blown away by compressed air, and a lubricant is sprayed onto the surface of the cavity of the forging die; Step 400, punching and skinning of the shaped forging, and then normalizing of the shaped forging; Step 500, shot blasting of the normalized shaped forging to obtain a final shaped product; The method also comprises an integrated initial forging and final forging device for initial forging and final forging of the blank with protrusions at the ends, and the integrated device comprises: A base (1) provided with an assembly groove for mounting the forging lower die (2); Four guide supports (3) provided around the assembly groove, and a guide groove (4) provided at the corners of the forging lower die (2) and matched with the guide supports (3); A transfer mechanism provided on both sides of the base (1), which is used to clamp the protrusions in the hole groove and rotate around the protrusions when the forging upper die (8) is separated from the forging lower die (2), so that the initial forging in the initial forging cavity (6) of the forging lower die (2) enters the final forging cavity (7) of the forging lower die (2); The upper middle part of the forging upper die (8) is provided with a connecting shaft (9), which is movably connected with the output end of the press, and the connecting shaft (9) can move axially along the output end of the press; The base (1) is provided with a reciprocating drive mechanism (10), which is used to drive the forging upper die (8) to make reciprocating action with the forging lower die (2) when the forging upper die (8) is not separated from the guide support (3) and the press is demoulding. The reciprocating drive mechanism (10) comprises a rotary locking assembly (11) installed on the top of the guide support (3) and an eccentric action part (5) connected to the rotary locking assembly (11). The rotary locking assembly (11) is used to connect four corners of the forging upper die (8), and the eccentric action part (5) is used to drive the rotary locking assembly (11) to move up and down along the axial direction of the guide support (3) to drive the forging upper die (8) to make reciprocating action with the forging lower die (2). The rotary locking assembly (11) comprises a sleeve rod (111) installed on the guide support (3) along the axial direction of the guide support (3), a rotating shaft rod (113) installed on the sleeve rod (111) along the axial direction of the sleeve rod (111), a servo steering wheel (112) arranged inside the sleeve rod (111), the bottom of the servo steering wheel (112) connected to the inner bottom of the guide support (3), the output end of the servo steering wheel (112) connected to the rotating shaft rod (113) through a spline, the end of the rotating shaft rod (113) located on the upper part of the sleeve rod (111) connected to a pin body (114), the pin body (114) perpendicular to the rotating shaft rod (113), a spring (115) sleeved on the rod of the sleeve rod (111), one end of the spring (115) fixedly connected to the outer wall of the sleeve rod (111), and the other end of the spring (115) fixedly connected to the inner wall of the guide support (3).

2. A method of forming a vehicle door hinge forging according to claim 1, wherein, In step 100, the temperature of the high-temperature calcination of the forging bar is controlled at 1100℃±20℃, and in the process of calcination, the mixed gas of protective gas and oxygen is introduced into the vertical placement surface of the forging bar.

3. The forming method of the vehicle door hinge forging according to claim 1, characterized in that, In step 301, the forgings placed in the initial forging cavity and the final forging cavity are centrally symmetric, and the transfer mechanism makes the initial forging in the initial forging cavity enter the final forging cavity through 180° overturning.

4. The method of claim 1, wherein The servo steering wheel (112) is used to drive the rotating shaft rod (113) to rotate, so that the pin body (114) contacts and locks or separates from the forging upper die (8); the output end of the eccentric action part (5) is connected to the bottom of the sleeve rod (111), and when the pin body (114) contacts and locks the forging upper die (8), the sleeve rod (111), the rotating shaft rod (113) and the pin body (114) are driven to move up and down, so that the forging upper die (8) makes reciprocating action with the forging lower die (2).

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