Forging method of forge piece

Abstract

In the actual application process, a fixed die body and a movable die body of a die are heated to the first preset temperature; then the blank heated to the second preset temperature is placed in a cavity of a fixed mold; then a first driver is controlled to drive the movable mold to execute mold closing operation towards the fixed mold according to preset mold closing parameters; after the die assembly operation is completed, a second driver is controlled to drive a side pressing core of the die according to preset extrusion parameters to conduct extrusion forming on the blank till a forge piece product is formed; and finally, the first driver and the second driver are controlled to reset, the forge piece product is taken out, and the forging process of the forge piece is completed. According to the forging method, the die is preheated, so that the influence of temperature differences in different time periods in the working process of die equipment on the blank can be reduced, and then the consistency of the sizes of corresponding forged piece products subjected to extrusion forming can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of forging processes, and more specifically, to a forging method for forgings. Background Art

[0002] The material utilization rate of forgings is determined by various factors such as product shape, process, and equipment. A high material utilization rate means less waste, which gives an advantage in terms of cost. Due to the working method of traditional forging equipment, in order to ensure complete forging of the forgings, forging waste (referred to as "flash" in the industry) will be generated, resulting in waste of raw materials and energy. In this context, the multi-directional hydraulic press forging process emerged, which can achieve flash-free and waste-free forging.

[0003] However, in the actual application process of this multi-directional hydraulic press forging process, the consistency of the forged products in different time periods is relatively poor.

[0004] In summary, how to solve the problem of poor consistency of the forged products in forging has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a forging method for forgings to solve the problem of poor consistency of the forged products in forging.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A forging method for forgings, the forging method comprising:

[0008] Preheat the mold, heating the fixed mold and the movable mold of the mold to a first preset temperature;

[0009] Place the blank, placing the blank heated to a second preset temperature into the cavity of the fixed mold;

[0010] Perform a mold closing operation, controlling a first driver to drive the movable mold to perform a mold closing operation towards the fixed mold with preset mold closing parameters;

[0011] Extrusion molding, controlling a second driver to drive a side pressure core of the mold to perform extrusion molding on the blank until a forging product is formed;

[0012] Take out the forging product, controlling the first driver and the second driver to reset, and taking out the forging product.

[0013] Optionally, in the step of preheating the mold, at least one of the first preheating method, the second preheating method, and the third preheating method is used to heat the fixed mold and the movable mold.

[0014] Optionally, the operation steps of the first preheating method include:

[0015] Step S11: Heat the heat carrier to a third preset temperature, where the third preset temperature is not lower than the first preset temperature;

[0016] Step S12: Place the heat carrier on the fixed mold, and drive the moving mold to move downward until it contacts the heat carrier, so that the heat carrier heats the moving mold and the fixed mold in a heat exchange manner;

[0017] Step S13: Monitor the temperatures of the moving mold and the fixed mold. After the temperatures of the moving mold and the fixed mold reach the first preset temperature, drive the moving mold to move upward and remove the heat carrier.

[0018] Optionally, the second preheating method is configured to directly heat the fixed mold and the moving mold by using a flame.

[0019] Optionally, the third preheating method is configured to directly heat the fixed mold and the moving mold by using an electric heating device.

[0020] Optionally, the value range of the first preset temperature is 100°C - 300°C.

[0021] Optionally, before performing the step of placing the blank, the following steps are further included:

[0022] Heat the blank, place the blank in a heating furnace for a preset duration until the blank reaches the second preset temperature;

[0023] Wherein, the preset duration is configured to be 40 minutes - 60 minutes, and the second preset temperature is 450°C ± 10°C.

[0024] Optionally, the preset mold closing parameters include the mold closing speed. The mold closing stroke of the moving mold moving towards the fixed mold includes a first stroke and a second stroke. The mold closing speed is configured such that the speed of the moving mold moving closer to the fixed mold in the first stroke is 300 mm / s ± 10 mm / s, and the speed of the moving mold moving closer to the fixed mold in the second stroke is 10 mm / min ± 1 mm / min.

[0025] Optionally, the preset mold closing parameters further include the mold closing pressure and / or the first pressure holding duration. Wherein, the mold closing pressure is the pressure applied when the first driver drives the moving mold to close the mold, and the mold closing pressure is configured to be 2900 kN - 3000 kN; the first pressure holding duration is configured to be 0.5 seconds - 1.5 seconds.

[0026] Optionally, the preset extrusion parameters include an extrusion speed, which is the moving speed of the side pressing core driven by the second driver towards the blank, and the extrusion speed is configured to be 10 mm / min ± 1 mm / min.

[0027] Optionally, the preset extrusion parameters further include an extrusion pressure and / or a second pressure holding duration. Among them, the extrusion pressure is the extrusion force applied by the second driver to drive the side pressing core towards the blank, and the extrusion pressure is configured to be 750 kN - 800 kN; the second pressure holding duration is configured to be 0.5 s - 1.5 s.

[0028] Optionally, between the step of preheating the mold and the step of placing the blank, there is further a step:

[0029] Manufacture a lubricating layer in the cavity of the fixed mold and the cavity of the movable mold.

[0030] Optionally, in the step of taking out the forging product, control the first driver and the second driver to perform a reset operation according to the following steps:

[0031] Control the first driver to reset to the initial position at 300 mm / s ± 10 mm / s;

[0032] Control the second driver to reset to the initial position at 160 mm / s ± 10 mm / s.

[0033] During this forging process, since both the fixed mold and the movable mold of the mold are preheated to the first preset temperature in advance, when the heated blank is placed in the cavity of the fixed mold and the movable mold is controlled to close the mold towards the fixed mold, it is beneficial to reduce the temperature difference of the mold equipment at the beginning of work and after working for a period of time. Because at the beginning of work, the mold equipment is almost at room temperature, and as the equipment runs continuously, the mold will heat up. After the working state reaches a stable state, the corresponding temperature will also stabilize within a range. Therefore, by preheating the mold, the influence of the temperature difference at different time periods during the working process of the mold equipment on the blank can be reduced, and then it helps to improve the dimensional consistency of the corresponding extruded and formed forging product. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 It is a flowchart of the forging method of the forging provided by the embodiment of the present invention;

[0036] Figure 2 The flowchart of the operation steps of the first preheating method provided by the embodiment of the present invention;

[0037] Figure 3 The schematic structural diagram of the fixed mold, movable mold and side pressing core for extruding the blank provided by the embodiment of the present invention;

[0038] Figure 4 The schematic structural diagram of the mold provided by the embodiment of the present invention;

[0039] Figure 5 The schematic structural diagram of the mold without showing the movable mold provided by the embodiment of the present invention.

[0040] Among them, Figures 3 - 5 in:

[0041] Fixed mold 1;

[0042] Movable mold 2;

[0043] Blank 3;

[0044] Side pressing core 4;

[0045] Side support mechanism 5. Specific implementation manner

[0046] The core of the present invention is to provide a forging method for forgings to solve the problem of poor consistency of forging products formed by forging.

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] Refer to Figure 1 Combine Figures 3 - 5 As shown, the present invention specifically provides a forging method for forgings, and the forging method includes the steps:

[0049] Step S1: Preheat the mold, and heat the fixed mold 1 and the movable mold 2 of the mold to the first preset temperature;

[0050] Step S2: Place the blank 3, and place the blank 3 heated to the second preset temperature into the cavity of the fixed mold 1;

[0051] Step S3: Perform the mold closing operation, and control the first driver to drive the movable mold 2 to perform the mold closing operation towards the fixed mold 1 with the preset mold closing parameters;

[0052] Step S4: Extrusion forming. Control the second driver to drive the side pressing core 4 of the mold to extrude the blank 3 with preset extrusion parameters until a forging product is formed.

[0053] Step S5: Take out the forging product. Control the first driver and the second driver to reset, and take out the forging product.

[0054] Among them, the first driver and the second driver constitute a driving assembly, and this driving assembly is preferably a multi-directional hydraulic cylinder. Specifically, the first driver is configured as the main cylinder of the multi-directional hydraulic cylinder, and the second driver is configured as the side cylinder of the multi-directional hydraulic cylinder. Through the drive of the multi-directional hydraulic cylinder, the drive is more stable and reliable. Of course, it can be understood that the above-mentioned multi-directional hydraulic cylinder as the driving assembly is only an example of the embodiment of the present invention. In the actual application process, it can also be designed into the structural form of other driving mechanisms, and no more specific limitations are made here.

[0055] In the actual application process of the above forging method, first heat the fixed mold 1 and the movable mold 2 of the mold to the first preset temperature; then place the blank 3 heated to the second preset temperature into the cavity of the fixed mold 1; then control the first driver (for example, the main cylinder of the multi-directional hydraulic cylinder) to drive the movable mold 2 to perform a mold closing operation on the fixed mold 1 with preset mold closing parameters; after the mold closing operation is completed, control the second driver (for example, the side cylinder of the multi-directional hydraulic cylinder) to drive the side pressing core 4 of the mold to extrude the blank 3 with preset extrusion parameters until a forging product is formed; finally, control the first driver and the second driver (for example, the main cylinder and the side cylinder of the multi-directional hydraulic cylinder) to reset, and take out the forging product to complete the forging process of the forging. During this forging process, since both the fixed mold 1 and the movable mold 2 of the mold are preheated to the first preset temperature in advance, when the heated blank is placed into the cavity of the fixed mold 1 and the movable mold 2 is controlled to close the mold on the fixed mold 1, it is beneficial to reduce the temperature difference between the beginning of the work of the mold equipment and after working for a period of time. Because at the beginning of the work, the mold equipment is almost at room temperature, and as the equipment runs continuously, the mold will heat up. After the working state reaches a stable state, the corresponding temperature will also stabilize within a range. Therefore, by preheating the mold, the influence of the temperature difference at different time periods during the working process of the mold equipment on the blank 3 can be reduced, which in turn helps to improve the dimensional consistency of the corresponding extruded and formed forging products; at the same time, it helps to reduce the temperature difference change during the working process of the mold, thereby reducing the risk of mold cracking and helping to improve the service life of the mold.

[0056] It should be noted that those skilled in the art should be able to understand the basic structure and principle of the multi-directional hydraulic press forging process: The basic structure of the forging die generally includes a fixed mold 1, a movable mold 2, a side pressing core 4 and a side support mechanism 5. Refer to Figures 3 - 5 wherein, the fixed mold 1 is generally arranged below the movable mold 2, and the movement direction of the movable mold 2 relative to the fixed mold 1 refers to Figure 3In the direction A, after the moving die 2 moves downward to the mold clamping state with the fixed die 1, an initial cavity for forging can be formed. The side pressing core 4 extends into the initial cavity after the moving die 2 and the fixed die 1 are clamped from the side. The movement direction of the side pressing core 4 can be referred to Figure 3 in the direction B. By extruding the blank 3 in the initial cavity with the side pressing core 4, the forging operation can be performed. The side supporting mechanism 5 is arranged opposite to the side pressing core 4 and is mainly used for laterally limiting the fixed die 1 and the moving die 2 when the side pressing core 4 applies force. When the side pressing core 4 is extruded to the preset position, the blank 3 is forged and formed. Since this forging method has no flash and no waste, it is more material-saving and cost-effective.

[0057] In addition, it should be noted that the above forging method can be applied to the forging of aluminum forgings and can also be applied to the forging of other materials, and no more specific limitations are made here.

[0058] In some specific implementation manners, in the step of preheating the mold, the way of heating the fixed die 1 and the moving die 2 can specifically adopt at least one of the three preheating methods: the first preheating method, the second preheating method, and the third preheating method.

[0059] Among them, referring to Figure 2 shown, the operation steps of the above first preheating method can specifically include:

[0060] Step S11: Heat the heat carrier (such as an iron block) to a third preset temperature, and the third preset temperature is not lower than the first preset temperature;

[0061] Step S12: Place the heat carrier on the fixed die 1, and drive the moving die 2 to move downward to contact the heat carrier through the first driver (the main cylinder of the multi-directional hydraulic cylinder) so that the heat carrier heats the moving die 2 and the fixed die 1 in a heat exchange manner;

[0062] Step S13: Monitor the temperatures of the moving die 2 and the fixed die 1 until the temperatures of the moving die 2 and the fixed die 1 reach the first preset temperature, then drive the moving die 2 to move upward and remove the heat carrier.

[0063] The main advantage of this first preheating method is that it is simple and easy to implement, and the cost is low.

[0064] In addition, the above second preheating method can be specifically configured to directly heat the fixed die 1 and the moving die 2 with a flame, such as directly heating the mold with a flame gun (flamethrower). The third preheating method can be specifically configured to directly heat the fixed die 1 and the moving die 2 with an electric heating device, such as corresponding electric heating devices are arranged in the fixed die 1 and the moving die 2, and the fixed die 1 and the moving die 2 can be heated through the electric heating devices.

[0065] In the actual application process, the first preheating method can be selected to preheat the mold, or the second preheating method can be selected to preheat the mold, or the third preheating method can be selected to preheat the mold; it can also be a combination of at least two preheating methods among the first preheating method, the second preheating method, and the third preheating method to preheat the mold, and the configuration can be selected according to the actual situation and specific requirements, and no more specific limitations are made here.

[0066] It should be noted that the value range of the above first preset temperature can be 100°C - 300°C, and when the blank is an aluminum blank, the first preset temperature is preferably 150°C. Of course, it can be understood that the above value range is only an example of the first preset temperature in the embodiments of the present invention. In the actual application process, other temperature value ranges can also be selected according to the material of the mold itself and the material of the forging.

[0067] In some more specific implementation schemes, in the above forging method, before the step of placing the blank 3, the following steps should also be included:

[0068] Heat the blank 3, place the blank 3 in a heating furnace and heat it for a preset duration until the blank 3 reaches the second preset temperature;

[0069] Among them, the preset duration is configured to be 40 minutes - 60 minutes, for example, 50 minutes can be selected, and the second preset temperature is 450°C ± 10°C.

[0070] By heating the blank 3 in the above heating furnace for a preset duration, the temperature distribution of the blank 3 after heating is more uniform, avoiding the situation where the internal and external temperature difference of the blank 3 is too large and affecting the forging quality. Of course, it can be understood that the above method of heating the blank 3 in the heating furnace is only an example of the embodiments of the present invention. In the actual application process, other heating methods can also be used to heat the blank 3, and no more specific limitations are made here.

[0071] It should be noted that in the above forging method, the preset mold closing parameters can specifically include the mold closing speed. The mold closing stroke of the moving mold moving towards the fixed mold includes a first stroke and a second stroke. The mold closing formation can specifically adopt a mold closing method of first fast and then slow. The mold closing speed can specifically be configured such that the speed of the moving mold 2 moving closer to the fixed mold 1 in the first stroke is 300 mm / s ± 10 mm / s, and the speed of the moving mold 2 moving closer to the fixed mold 1 in the second stroke is 10 mm / min ± 1 mm / min. By designing such a mold closing speed, the mold closing efficiency can be improved, and at the same time, the stability of mold closing can be ensured.

[0072] In a further embodiment, the above preset clamping parameters may further include a clamping pressure and / or a first pressure holding duration. The clamping pressure is the pressure applied when the first actuator drives the moving die 2 to close towards the fixed die 1. The clamping pressure is configured to be 2900 kN - 3000 kN, preferably configured to be 2940 kN. Correspondingly, the main cylinder of the multi-directional hydraulic cylinder is equivalent to bearing a weight of 300 tons. The first pressure holding duration is configured to be 0.5 seconds - 1.5 seconds. By designing this first pressure holding duration, the springback degree of the blank can be effectively reduced, which helps to ensure the dimensional consistency of the forging product. If the first pressure holding duration is zero (i.e., no pressure holding), the dimensional deviation of the final forging product will be relatively large, but if the first pressure holding duration is too long, it will affect the processing efficiency. The applicant surprisingly found that setting the first pressure holding duration to 1 second is a relatively preferred solution.

[0073] In addition, it should be noted that in the above forging method, the preset extrusion parameters may specifically include an extrusion speed. The extrusion speed is also the moving speed of the side pressing core 4 driven by the second actuator towards the blank 3. The applicant surprisingly found that the extrusion speed is preferably configured to be 10 mm / min ± 1 mm / min, which can better ensure the quality of the forging product after extrusion.

[0074] In a further embodiment, in the above forging method, the preset extrusion parameters may further include an extrusion pressure and / or a second pressure holding duration. The extrusion pressure is configured such that the extrusion force applied by the second actuator driving the side pressing core 4 towards the blank 3 is 750 kN - 800 kN, preferably configured to be 784 kN. Correspondingly, the side cylinder of the multi-directional hydraulic cylinder is equivalent to bearing a weight of 80 tons. The second pressure holding duration is configured to be 0.5 seconds - 1.5 seconds. By designing this second pressure holding duration, the springback degree of the blank can be effectively reduced, which helps to ensure the dimensional consistency of the forging product. If the second pressure holding duration is zero (i.e., no pressure holding), the dimensional deviation of the final forging product will be relatively large, but if the second pressure holding duration is too long, it will affect the processing efficiency. The applicant surprisingly found that setting the second pressure holding duration to 1 second is a relatively preferred solution.

[0075] In some other specific embodiments, in the above forging method, between the step of preheating the mold and the step of placing the blank 3, there may further be a step:

[0076] A lubricating layer is made in the cavity of the fixed die 1 and the cavity of the moving die 2. The specific manufacturing method of this lubricating layer can be to spray a lubricant in the cavity of the fixed die 1 and the cavity of the moving die 2 to form a film layer, or it can also be to directly brush the lubricant. In the actual application process, it can be selected according to the convenience of manufacturing. By designing this lubricating layer, on the one hand, it can relieve the temperature difference between the blank and the mold, and on the other hand, it can also reduce the friction force and extrusion force between the blank 3 and the cavities of the fixed die 1 and the moving die 2 during the forming process, which helps to improve the service life of the mold.

[0077] It should be noted that in the step of taking out the forging product, the first driver and the second driver can be specifically controlled to perform the reset operation according to the following steps:

[0078] Control the first driver to reset to the initial position at a speed of 300 mm / s ± 10 mm / s;

[0079] Control the second driver to reset to the initial position at a speed of 160 mm / s ± 10 mm / s.

[0080] By designing the above reset operation mode, the first driver and the second driver can quickly reset and retract after the forming operation, which is convenient for connecting with the subsequent operation process. For example, the forging can be taken away by manual or manipulator and placed in the specified position, reducing the connection gap time between processes and not affecting the working rhythm and efficiency.

[0081] In addition, it should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0082] As shown in this application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one" and / or "the" do not specifically refer to the singular, but may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. An element defined by the statement "comprising one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0083] Among them, in the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0084] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0085] In this article, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A forging method for forgings, characterized in that, the forging method includes: Preheating the mold, heating the fixed mold (1) and the moving mold (2) of the mold to a first preset temperature; Placing the blank (3), placing the blank (3) heated to a second preset temperature into the cavity of the fixed mold (1); Performing a mold closing operation, controlling the first driver to drive the moving mold (2) towards the fixed mold (1) to perform a mold closing operation with preset mold closing parameters; Extrusion forming, controlling the second driver to drive the side pressing core (4) of the mold to extrude the blank (3) until a forging product is formed; Taking out the forging product, controlling the first driver and the second driver to reset, and taking out the forging product.

2. The forging method for forgings according to claim 1, characterized in that, in the step of preheating the mold, at least one of the three preheating methods, namely the first preheating method, the second preheating method and the third preheating method, is used to heat the fixed mold (1) and the moving mold (2).

3. The forging method for forgings according to claim 2, characterized in that, the operation steps of the first preheating method include: Step S11: Heating the heat carrier to a third preset temperature, and the third preset temperature is not lower than the first preset temperature; Step S12: Placing the heat carrier on the fixed mold (1), and driving the moving mold (2) to move down until it contacts the heat carrier, so that the heat carrier heats the moving mold (2) and the fixed mold (1) by heat exchange; Step S13: Monitoring the temperatures of the moving mold (2) and the fixed mold (1) until the temperatures of the moving mold (2) and the fixed mold (1) reach the first preset temperature, then driving the moving mold (2) to move up, and taking away the heat carrier.

4. The forging method for forgings according to claim 2, characterized in that, the second preheating method is configured to directly heat the fixed mold (1) and the moving mold (2) by using a flame.

5. The forging method for forgings according to claim 2, characterized in that, the third preheating method is configured to directly heat the fixed mold (1) and the moving mold (2) by using an electric heating device.

6. The forging method for forgings according to claim 1, characterized in that, the value range of the first preset temperature is 100°C - 300°C.

7. The forging method for forgings according to claim 1, characterized in that, before performing the step of placing the blank (3), there is also a step: Heating the blank (3), putting the blank (3) into a heating furnace and heating for a preset duration until the blank (3) reaches the second preset temperature; wherein, the preset duration is configured to be 40 minutes - 60 minutes, and the second preset temperature is 450°C ± 10°C.

8. The forging method for forgings according to claim 1, characterized in that, The preset mold clamping parameters include the mold clamping speed. The mold clamping stroke of the moving mold moving towards the fixed mold includes a first stroke and a second stroke. The mold clamping speed is configured such that the speed of the moving mold (2) moving closer to the fixed mold (1) in the first stroke is 300 mm / s ± 10 mm / s, and the speed of the moving mold (2) moving closer to the fixed mold (1) in the second stroke is 10 mm / min ± 1 mm / min.

9. The forging method of the forging as claimed in claim 8, characterized in that the preset mold clamping parameters further include a mold clamping pressure and / or a first pressure holding duration. Wherein, the mold clamping pressure is the pressure applied when the first driver drives the moving mold (2) to clamp towards the fixed mold (1), and the mold clamping pressure is configured to be 2900 kN - 3000 kN; the first pressure holding duration is configured to be 0.5 seconds - 1.5 seconds.

10. The forging method of the forging as claimed in claim 1, characterized in that the preset extrusion parameters include an extrusion speed, and the extrusion speed is the movement speed of the second driver driving the side pressing core (4) towards the blank (3), and the extrusion speed is configured to be 10 mm / min ± 1 mm / min.

11. The forging method of the forging as claimed in claim 10, characterized in that the preset extrusion parameters further include an extrusion pressure and / or a second pressure holding duration. Wherein, the extrusion pressure is the extrusion force applied by the second driver driving the side pressing core (4) towards the blank (3), and the extrusion pressure is configured to be 750 kN - 800 kN; the second pressure holding duration is configured to be 0.5 seconds - 1.5 seconds.

12. The forging method of the forging as claimed in claim 1, characterized in that between the step of preheating the mold and the step of placing the blank (3), there is further a step: manufacturing a lubricating layer in the cavity of the fixed mold (1) and in the cavity of the moving mold (2).

13. The forging method of the forging as claimed in claim 1, characterized in that in the step of taking out the forging product, the first driver and the second driver are controlled to perform a reset operation according to the following steps: controlling the first driver to reset to the initial position at 300 mm / s ± 10 mm / s; controlling the second driver to reset to the initial position at 160 mm / s ± 10 mm / s.

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