Hydraulic cylinder bottom forging forming method and upsetting forming device

Abstract

The application discloses a hydraulic cylinder bottom forging forming method and upsetting forming device, which comprises the following steps: heating a blank to a blank core temperature satisfying an upsetting temperature; transferring the blank to an upsetting die, performing one-time material distribution on the blank through multiple upsetting operations to obtain an upsetting piece with required length and diameter; adjusting the temperature of a pre-forging die, and performing secondary material distribution on the upsetting piece by using the pre-forging die; adjusting the temperature of a final-forging die, and performing shaping treatment on the forged piece after secondary material distribution by using the final-forging die; the upsetting piece with required length and diameter is obtained through multiple upsetting operations, the upsetting quality is effectively improved, the upsetting bending and longitudinal crack problems caused by strong single direct upsetting treatment are avoided, the acting force of each upsetting die on the same blank is the same, the downward acting force of each upsetting die is the same, the deformation of the same blank is the same, and therefore the stability of the upsetting deformation process is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of forging forming technology, in particular to a hydraulic cylinder bottom forging forming method and upsetting forming device, which can obtain an upsetting piece with required length and diameter through multiple upsetting operations, effectively improve the upsetting quality, and avoid the problems of upsetting bending and longitudinal cracks caused by strong single direct upsetting treatment. BACKGROUND

[0002] As a linear hydraulic motor, the hydraulic cylinder is often used to generate a single force to achieve one-way stroke movement. The hydraulic cylinder is mainly used in earth-moving equipment to lift or lower the boom, stick or bucket, especially in construction equipment (engineering vehicles), manufacturing machinery and civil engineering. The cylinder bottom, as an important connecting part of the hydraulic cylinder, works by connecting the moving parts to the main body of the hydraulic cylinder through bolts or tie rods, allowing the hydraulic cylinder to achieve linear reciprocating motion. The cylinder bottom, as a connecting part during the movement of the hydraulic cylinder, needs to withstand stress in multiple directions, and has high requirements for its mechanical properties.

[0003] Due to the complex rib structure of the cylinder bottom, the metal flow direction is disordered and the cooling rate of each part is uneven during casting, resulting in a large number of casting defects such as pores, sand holes and porosity in the cylinder bottom, which ultimately affects the mechanical properties of the product. The forging forming process not only solves the above casting defects and low mechanical properties of the cylinder bottom, but also further improves the surface quality of the cylinder bottom after forging forming, reduces the machining cost, and improves the size accuracy and service life of the cylinder bottom.

[0004] Most existing forging processes combine upsetting treatment before forging to improve the transverse mechanical properties of the forging and reduce anisotropy, but the existing forging forming method still has the following defects:

[0005] Most upsetting operations are one-time forming, ignoring the high and low of metal plasticity, resulting in a large degree of deformation caused by single operation, which is prone to upsetting bending, and single strong upsetting is prone to cracks in the upsetting piece. SUMMARY

[0006] Therefore, the present application provides a hydraulic cylinder bottom forging forming method and upsetting forming device to solve the technical problems that most upsetting operations are one-time forming, ignoring the high and low of metal plasticity, resulting in a large degree of deformation caused by single operation, which is prone to upsetting bending, and single strong upsetting is prone to cracks in the upsetting piece.

[0007] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0008] A hydraulic cylinder bottom forging forming method, comprising the following steps:

[0009] The blanks are fed into the heating device in sequence, and each blank is heated in turn until the core temperature of the blank meets the upsetting temperature;

[0010] Each blank is transferred to different upsetting dies in sequence, and subjected to upsetting operations with the same force in different upsetting dies to obtain upsetting parts with the required length and diameter;

[0011] Adjust the temperature of the pre-forging die, and use the pre-forging die to pre-forge the upsetting piece to obtain a prototype structure that conforms to the shape of the cylinder bottom forging. Adjust the temperature of the final forging die, and use the final forging die to finalize the forging with the prototype structure.

[0012] As a preferred embodiment of the present invention, the number of the upsetting dies is specifically set according to the final ratio of the upsetting length to the upsetting diameter of the upsetting piece. The number of the upsetting dies is specifically selected as follows:

[0013] determining an initial ratio of the original length to the original diameter of each of the blanks, and determining an upsetting span value according to a difference between the initial ratio and the final ratio;

[0014] determining the heat loss of the blank when it is transferred between two adjacent upsetting dies;

[0015] On the premise that each upsetting die presses the blank to the same depth, the upsetting times are determined in combination with heat loss and upsetting span value, wherein the upsetting times is specifically the number of the selected upsetting dies.

[0016] As a preferred solution of the present invention, the upsetting dies are distributed in sequence according to the upsetting order, and the upsetting dies perform multiple upsetting processes on the blank in sequence to obtain an upsetting piece with a set diameter and length.

[0017] As a preferred solution of the present invention, the upsetting die is divided into an upsetting upper die and an upsetting lower die, the upsetting lower die of all upsetting dies is arranged on a fixed table, and the upsetting upper die of all upsetting dies is arranged on a movable table;

[0018] The upsetting upper dies of all the upsetting dies are driven by the same power and move linearly up and down along the vertical direction;

[0019] The extrusion spacing between the upsetting upper die and the upsetting lower die of each upsetting die is the same, the lower end heights of the upsetting upper dies in different upsetting dies are different, the top end heights of the upsetting lower dies in different upsetting dies are different, and the distance difference between two adjacent upsetting upper dies is the same as the upsetting length difference between two upsetting operations, or the distance difference between two adjacent upsetting lower dies is the same as the upsetting length difference between two upsetting operations.

[0020] As a preferred scheme of the present application, the height of the cavity bottom of the upsetting lower die presents an upward lifting trend according to the upsetting sequence, and the height of the acting head of the upsetting upper die is the same, and the height difference of the cavity bottom of adjacent two upsetting lower dies is the extrusion height of single upsetting;

[0021] Or, the height of the acting head of the upsetting upper die presents a downward extending trend according to the upsetting sequence, and the height of the cavity bottom of the upsetting lower die is the same, and the height difference of the acting head of adjacent two upsetting upper dies is the extrusion height of single upsetting.

[0022] As a preferred scheme of the present application, a moving manipulator is arranged outside the fixed seat, the number of the moving manipulators is the same as the number of the upsetting dies, all the moving manipulators move synchronously, the moving manipulators sequentially transfer the blank into multiple upsetting dies in order to sequentially perform the upsetting treatment on the same blank in multiple upsetting dies, and all the moving manipulators are reset after moving the blank to the next upsetting die.

[0023] To solve the above technical problems, the present application further provides the following technical scheme: a kind of upsetting forming device of hydraulic cylinder bottom forging, comprising:

[0024] A fixed seat is used to fixedly install multiple upsetting lower dies of upsetting dies, wherein the upsetting lower dies are used to place blanks;

[0025] A moving table is used to fixedly install multiple upsetting upper dies of upsetting dies, wherein the upsetting upper dies are used to apply downward pressure to the upper end surface of the blank;

[0026] A press is arranged at the upper end of the moving table, the output end of the press is fixedly installed with the upper end surface of the moving table, and the press is used to push the moving table to move linearly up and down so that the upsetting upper die applies a fixed force to the blank in the upsetting lower die.

[0027] The distance between the upsetting lower die and the upsetting upper die of each upsetting die is adjustable according to the height of the blank.

[0028] As a preferred scheme of the present application, a pushing assembly is arranged at the center position of each upsetting die of the fixed seat, the pushing assembly is always located at the center position of the upsetting die, and the pushing assembly is used to push the blank after single upsetting treatment to move out of the upsetting die.

[0029] As a preferred scheme of the present application, the die cavity diameter of the upsetting lower die increases along the upsetting direction in order, and the diameter of the acting head of the upsetting upper die also increases along the upsetting direction in order.

[0030] As a preferred scheme of the present application, the fixed seat is connected with the moving table through a plurality of guide rods, and the moving table moves linearly up and down along the guide rods.

[0031] Compared with the prior art, the present application has the following advantages:

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

[0033] In addition, the workpiece after each upsetting treatment is sequentially transferred to the next upsetting die, all the upsetting dies are driven by the same power source, and the workpieces with different upsetting degrees are placed in different upsetting dies at the same time, so that the energy is integrated and utilized, the energy utilization rate is improved, the upsetting efficiency is improved, and the cost of multiple upsetting treatments is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0035] Fig. 1 The flowchart of the forging forming method provided by the embodiment of the present application;

[0036] Fig. 2 The first embodiment structure diagram of the upsetting forming device provided by the embodiment of the present application;

[0037] Fig. 3 The structure diagram of the pushing assembly in the first embodiment provided by the embodiment of the present application;

[0038] Fig. 4 The second embodiment structure diagram of the upsetting forming device provided by the embodiment of the present application.

[0039] The numbers in the drawings represent the following:

[0040] 1-fixed seat; 2-upsetting lower die; 3-moving table; 4-upsetting upper die; 5-press; 6-pushing assembly; 7-plurality of guide rods; DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] As shown in the drawings, Figs. 1 to 4 The present application provides a hydraulic cylinder bottom forging forming method. Due to the complex rib structure of the cylinder bottom, the metal flow direction is disordered and the cooling rate of each part is uneven during casting, resulting in a large number of casting defects such as pores, sand holes and porosity in the cylinder bottom, which ultimately affects the mechanical properties of the product.

[0043] The forging forming process of the present embodiment not only solves the above-mentioned casting defects and low mechanical properties of the cylinder bottom, but also effectively solves the problem of incomplete filling of the rib structure of the similar cylinder bottom by using the upsetting and preforming processes twice. The surface quality of the cylinder bottom can be further improved after forging forming, the machining cost is reduced, and the size precision and service life of the cylinder bottom formed by forging are improved. The cylinder bottom forging forming method of the present embodiment specifically includes the following steps:

[0044] (1) The blank is sent to the heating device according to the sequence, and each blank is heated to a blank core temperature that meets the upsetting temperature.

[0045] The end face flatness of the blank is ±0.5°, which can effectively avoid the bending of the blank during upsetting.

[0046] The blank is heated in the medium-frequency induction heating furnace at a temperature of 1200℃ for 30 minutes. Three blanks are taken from the furnace door, and the core temperature of the blank is confirmed by an infrared temperature gun to be within the range of 1150-1230℃, so that the next upsetting process can be performed.

[0047] (2) Each blank is sequentially transferred to different upsetting dies, and the same force is used for upsetting operation in the different upsetting dies to obtain an upsetting piece with a required length and diameter.

[0048] After the heated blank is subjected to upsetting treatment, an upsetting piece with a preset length and diameter is obtained. Upsetting is a forging process that reduces the length of the blank while increasing the cross-sectional area. The function of upsetting is to obtain a forging piece with a larger cross-sectional area and a smaller length from a blank with a larger length and a smaller cross-sectional area by downward pressing, so as to improve the transverse mechanical properties of the forging piece and reduce anisotropy.

[0049] The length to diameter ratio of the upsetting part should be less than 2.5, otherwise the upsetting part is easy to bend; the end surface of the blank should be flat and perpendicular to the axis; the forging force should be correct, otherwise the blank is easy to be deformed; the plasticity of the metal should be considered to control the deformation degree; for the metal with high hardness, the upsetting is easy to cause longitudinal cracks.

[0050] Therefore, in the embodiment, the number of the upsetting dies is determined according to the ratio of the upsetting length to the diameter, the pressing depth of each upsetting die is the same, and the ratio of the length to the diameter of each pressing of the upsetting die is less than 2.5.

[0051] In the embodiment, the upsetting operation is generally set to be at least twice, so that the ratio of the length to the diameter of the pressing length of each upsetting operation is relatively small, thereby avoiding the longitudinal cracks caused by the strong upsetting.

[0052] That is, in the embodiment, the number of the upsetting dies is at least two, and the upsetting dies are distributed in sequence according to the upsetting transfer sequence, and the upsetting dies sequentially perform the upsetting treatment on the blank to obtain the upsetting part with the set diameter and length.

[0053] In the embodiment, the number of the upsetting dies is determined according to the final ratio of the upsetting length to the upsetting diameter of the upsetting part, and the implementation of selecting the number of the upsetting dies is specifically as follows:

[0054] The initial ratio of the original length to the original diameter of each blank is determined, and the upsetting span value is determined according to the difference between the initial ratio and the final ratio;

[0055] The heat loss of the blank transferred between two adjacent upsetting dies is determined.

[0056] Under the condition that the pressing depth of each upsetting die on the blank is the same, the upsetting times are determined in combination with the heat loss and the upsetting span value, wherein the upsetting times are specifically the number of the upsetting dies selected.

[0057] The embodiment changes the traditional single upsetting treatment process into a multiple upsetting treatment process, wherein the pressing force of each upsetting treatment is the same, and therefore the blank obtains the upsetting part with the set diameter and length after the multiple upsetting treatment.

[0058] The upsetting operation needs to keep the high temperature state of the blank, so the transfer and upsetting efficiency of multiple upsetting operations need to be high to avoid the problem of blank temperature drop affecting the upsetting work and production quality during the upsetting process. Therefore, the upsetting dies are integrated under the action of the same power in the embodiment, and the blank can be quickly moved to the next upsetting die after the upsetting operation of the previous upsetting die. Therefore, the embodiment can realize the upsetting operation of multiple blanks at a time, improve the stability of the upsetting operation of the blank, and improve the efficiency of the upsetting operation.

[0059] The upsetting dies are divided into upsetting upper dies and upsetting lower dies. The upsetting lower dies of all the upsetting dies are arranged on the fixed seat, and the upsetting upper dies of all the upsetting dies are arranged on the movable table. The upsetting upper dies of all the upsetting dies are driven by the same power and move linearly up and down along the vertical direction.

[0060] The pressing distance between the upsetting upper die and the upsetting lower die of each upsetting die is the same, the lower end height of the upsetting upper die in different upsetting dies is different, the top end height of the upsetting lower die in different upsetting dies is different, the distance difference between two adjacent upsetting upper dies is the same as the upsetting length difference of two upsetting operations, or the distance difference between two adjacent upsetting lower dies is the same as the upsetting length difference of two upsetting operations.

[0061] In the embodiment, all the upsetting upper dies of all the upsetting dies are moved up and down at the same time under the action of the same power, so that the energy is reused, the quality of the forgings is improved, and the cost of the forgings is reduced. The same power is used to perform multiple upsetting operations on the same blank, which is equivalent to converting a single large deformation range into multiple small deformation ranges, so that the deformation degree of each upsetting operation can be controlled, and the problems of bending and longitudinal cracks caused by strong upsetting can be avoided.

[0062] In addition, in order to realize the upsetting pressing operation of all the upsetting dies and ensure that all the upsetting upper dies can simultaneously press and upset the blank in the upsetting lower die, the pressing distance between the upsetting upper die and the upsetting lower die of each upsetting die is the same, and the distance difference between the upper and lower spacing of two adjacent upsetting dies is the same as the upsetting length difference of two upsetting operations.

[0063] The pressing distance between the upsetting upper die and the upsetting lower die of each upsetting die is the same, so that all the upsetting upper dies of all the upsetting dies simultaneously contact and press the blank in the upsetting lower die, avoiding the problem that the time when all the upsetting upper dies of all the upsetting dies contact the blank is not the same, resulting in insufficient upsetting impact force. Therefore, the impact strength of each upsetting die on the blank is the same, the forging force of the upsetting upper die is the same, and the deformation degree of each upsetting die on the blank is the same.

[0064] Since the present embodiment can realize the transfer of the blank after upsetting treatment to the next upsetting lower die in sequence, the lengths of the blanks in the adjacent two upsetting lower dies are different, and the difference is the pressing length of single upsetting operation. Therefore, in order to realize the same extrusion distance between the upsetting upper die and the upsetting lower die of each upsetting die, the following two cases can be set in the present embodiment.

[0065] Firstly, the height of the cavity bottom of the upsetting lower die is raised upward according to the upsetting sequence, and the height of the acting head of the upsetting upper die is the same, and the height difference of the cavity bottom of the adjacent two upsetting lower dies is the extrusion height of single upsetting.

[0066] In this case, it is necessary to ensure that the upper end surface of the blank is flush with the opening of the upsetting lower die or the distance between the upper end surface of the blank and the opening of the upsetting lower die is the same when the blank is placed inside all the upsetting lower dies.

[0067] Secondly, the height of the acting head of the upsetting upper die is extended downward according to the upsetting sequence, and the height of the cavity bottom of the upsetting lower die is the same, and the height difference of the acting head of the adjacent two upsetting upper dies is the extrusion height of single upsetting.

[0068] When the blank is placed inside all the upsetting lower dies in this case, the distance between the upper end surface of the blank and the opening of the upsetting lower die is not the same, and the distance between the upper end surface of the blank and the opening of the upsetting lower die increases in turn along the moving sequence of the blank, and the increase is the extrusion height of single upsetting. Therefore, when the height of the acting head of the upsetting upper die is extended downward according to the upsetting sequence, the extrusion distance between the upsetting upper die and the upsetting lower die of each upsetting die can be ensured to be the same.

[0069] In summary, the present embodiment is different from the traditional single upsetting treatment operation, and the upsetting piece with the required length and diameter is obtained by using multiple upsetting operations, which can effectively improve the upsetting quality and avoid the problems of upsetting bending and longitudinal cracks caused by strong single direct upsetting treatment.

[0070] In addition, the blank after each upsetting treatment is sequentially transferred to the next upsetting die in the present embodiment, and all the upsetting dies use the same power drive. Therefore, the force of each upsetting die on the same blank is the same, and the deformation of the same blank caused by each upsetting die is the same, thereby improving the stability of the upsetting deformation process, realizing integrated use of energy, improving the energy utilization rate, and reducing the cost of multiple upsetting treatment.

[0071] It needs to be particularly pointed out that the movable mechanical hands are arranged outside the fixed bench, the number of the movable mechanical hands is the same as that of the upsetting dies, all the movable mechanical hands move synchronously, the movable mechanical hands sequentially transfer the blank to the multiple upsetting dies in order, so that the same blank is sequentially subjected to the upsetting treatment in the multiple upsetting dies, and all the movable mechanical hands move the blank to the next upsetting die and then reset.

[0072] The embodiment sequentially transfers the blank from one upsetting die to the next upsetting die by using the movable mechanical hands, the number of the movable mechanical hands is the same as that of the upsetting dies in use, the moving position of each movable mechanical hand is fixed, that is, the movable mechanical hand is transferred from the upsetting die A to the upsetting die B, returns to the original position of the upsetting die A after completing the grabbing, transferring and releasing once, therefore, in the embodiment, the movable mechanical hand only needs to have the functions of grabbing and releasing, and the multiple movable mechanical hands can be integrated on one moving track, and the displacement distance and angle of each movable mechanical hand are the same.

[0073] In this step, the specific implementation steps of the multiple upsetting operations on the blank are as follows:

[0074] The driving of all the upsetting upper dies to move downward subjects the blank in each upsetting lower die to the upsetting treatment with the same extrusion force;

[0075] The movable mechanical hand transfers the blank from the lower die of the previous upsetting die to the lower die of the next upsetting die along the moving track, and then the movable mechanical hand resets, so that the upsetting operations on multiple blanks in the same upsetting forming device are realized;

[0076] The same blank is subjected to multiple upsetting treatments to obtain the upsetting piece with the required length and diameter.

[0077] (3) The temperature of the pre-forging die is adjusted, the upsetting piece is subjected to the pre-forging treatment by using the pre-forging die, the rough structure conforming to the shape of the cylinder bottom forging is obtained, the temperature of the finish-forging die is adjusted, and the forging with the rough structure is subjected to the shaping treatment by using the finish-forging die.

[0078] The temperature of each position of the finish-forging die should be in the range of 150-200℃, the temperature of the forging after finish-forging is ≥850℃, and after the appearance of the forging is inspected after the forging, if there is no defect such as missing material, crack and folding, the forging is the qualified finished product forging.

[0079] It needs to be explained that the present embodiment adjusts the upsetting operation in the forging forming process, avoids the problems of folding, cracking and material shortage of the cylinder bottom in the forming process, fills the cylinder bottom rib structure completely, realizes multiple upsetting operations, avoids the situation that the blank appears cracks caused by strong upsetting, reduces the requirement for upsetting power, integrates multiple upsetting operations in the same power system, improves the upsetting transfer efficiency, reduces the upsetting cost, ensures the temperature and production quality during upsetting.

[0080] In addition, the present application also provides an upsetting forming device for the hydraulic cylinder bottom forging forming method.

[0081] The fixed seat 1 is used for fixedly installing multiple upsetting lower dies 2 of the upsetting dies, wherein the upsetting lower dies 2 are used for placing the blanks.

[0082] The fixed seat 1 is provided with a pushing assembly 6 at the center position of each upsetting die, the pushing assembly 6 is always located at the center position of the upsetting die, and the pushing assembly 6 is used for pushing the blank after single upsetting operation to move out of the upsetting die.

[0083] The die cavity diameter of the upsetting lower die 2 increases along the upsetting direction in sequence, and the acting head diameter of the upsetting upper die 4 also increases along the upsetting direction in sequence.

[0084] The moving table 3 is used for fixedly installing multiple upsetting upper dies 4 of the upsetting dies, wherein the upsetting upper dies 4 are used for applying downward pressure to the upper end surface of the blank.

[0085] It needs to be explained that the distance between the upsetting lower die 2 and the upsetting upper die 4 of each upsetting die is adjustable according to the height of the blank, so that it can adapt to blanks of different heights, and in this process, the processing strength can be automatically adjusted by the height of the blank processed, so that it ensures the same processing pace in this process.

[0086] The fixed seat 1 and the moving table 3 are connected through multiple guide rods 7, and the moving table 3 moves linearly up and down along the multiple guide rods 7.

[0087] The press 5 is arranged at the upper end of the moving table 3, the output end of the press 5 is fixedly installed with the upper end surface of the moving table 3, the press 5 is used for pushing the moving table 3 to move linearly up and down, so that the upsetting upper die 4 applies a fixed force to the blank in the upsetting lower die 2.

[0088] The embodiment integrates multiple upsetting dies in the same power driving system, divides the upsetting operation into multiple force extrusion processes, effectively controls the same single deformation degree of each upsetting die on the blank, controls the deformation degree each time, avoids the longitudinal crack caused by strong upsetting, and simultaneously completes the upsetting operation on multiple blanks, improves the upsetting efficiency, and improves the utilization rate of power energy.

[0089] The above examples are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also considered to fall within the protection scope of the present application.

Claims

1. A method for forming a hydraulic cylinder bottom forging, characterized in that: The following steps are involved: The blanks are fed into the heating device in sequence, and each blank is heated in turn until the core temperature of the blank meets the upsetting temperature; Each blank is transferred to a different upsetting die in sequence, and each blank is subjected to an upsetting operation with the same force in a different upsetting die to obtain an upsetting piece with the required length and diameter; The number of the upsetting dies is specifically set according to the final ratio of the upsetting length to the upsetting diameter of the upsetting piece. The number of the upsetting dies is specifically selected as follows: determining an initial ratio of the original length to the original diameter of each of the blanks, and determining an upsetting span value according to a difference between the initial ratio and the final ratio; determining the heat loss of the blank when it is transferred between two adjacent upsetting dies; Under the premise that the pressing depth of each upsetting die on the blank is the same, the upsetting times are determined in combination with the heat loss and the upsetting span value; The number of upsetting times is specifically the number of selected upsetting dies; The upsetting dies are sequentially distributed according to an upsetting sequence, and the upsetting dies perform multiple upsetting processes on the blank in sequence to obtain an upsetting piece with a set diameter and length; The upsetting die is divided into an upsetting upper die and an upsetting lower die. The upsetting lower die of all upsetting dies is arranged on a fixed table, and the upsetting upper die of all upsetting dies is arranged on a movable table. The upsetting upper dies of all the upsetting dies are driven by the same power and move linearly up and down along the vertical direction; The bottom height of the cavity of the upsetting lower die tends to rise in the order of upsetting, and the action heads of the upsetting upper die have the same height. The height difference between the bottoms of the cavities of two adjacent upsetting lower dies is the extrusion height of a single upsetting. Alternatively, the height of the action head of the upsetting upper die tends to extend downward in the upsetting sequence, and the cavity bottom heights of the upsetting lower die are the same, and the height difference between the action heads of two adjacent upsetting upper dies is the extrusion height of a single upsetting.

2. A method for forming a hydraulic cylinder bottom forging according to claim 1, characterized in that: A mobile manipulator is provided on the outside of the fixed platform. The number of the mobile manipulators is the same as the number of the upsetting dies. All the mobile manipulators move synchronously. The mobile manipulators transfer the blanks from the multiple upsetting dies in sequence, so that the same blank can be upset in the multiple upsetting dies in sequence. All the mobile manipulators move the blanks to the next upsetting die and then reset.

3. An upsetting forming device based on the hydraulic cylinder bottom forging forming method according to any one of claims 1-2, characterized in that: include: A fixed seat (1) is used for fixing and mounting a plurality of upsetting lower dies (2) of the upsetting dies, wherein the upsetting lower dies (2) are used for placing blanks; A movable table (3) is used for fixing and mounting a plurality of upsetting upper dies (4) of the upsetting dies, wherein the upsetting upper dies (4) are used for applying a downward pressure to the upper end surface of the blank; A press (5) is arranged at the upper end of the movable table (3), and an output end of the press (5) is fixedly mounted on the upper end surface of the movable table (3). The press (5) is used to push the movable table (3) to move linearly up and down, so that the upsetting upper die (4) applies a fixed force to the blank in the upsetting lower die (2).

4. The upsetting forming device according to claim 3, characterized in that: The fixed platform (1) is provided with a pusher assembly (6) at the center of each upsetting die. The pusher assembly (6) is always located at the center of the upsetting die. The pusher assembly (6) is used to push the blank that has completed a single upsetting process out of the upsetting die.

5. The upsetting forming device according to claim 3, characterized in that: The diameter of the mold cavity of the upsetting lower die (2) increases sequentially along the upsetting direction, and the diameter of the action head of the upsetting upper die (4) also increases sequentially along the upsetting direction.

6. The upsetting forming device according to claim 3, characterized in that: The fixed seat (1) and the movable table (3) are connected via a multi-guide rod (7), and the movable table (3) moves linearly up and down along the multi-guide rod (7).

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