A large-cavity forging-type hydraulic press and a method for manufacturing the same

Abstract

This invention discloses a large-cavity forging six-sided hydraulic press and its preparation method. It employs a combination of free forging and die forging to forge the hinge beam blank. Firstly, it achieves near-net-shape precision forming, enabling small-margin forging. Secondly, the plum blossom-shaped blank formed by free forging avoids insufficient forging and uneven microstructure caused by press tonnage limitations. Thirdly, the forged hinge beam cavity can reach Ø1250mm and above. Furthermore, it utilizes a combined drilling, sawing, and milling process to achieve large-margin removal of the lugs and high-precision, high-efficiency machining. Roll pressing is used on the inner wall of the cylinder and the surface of the lugs to improve precision and surface roughness, increase surface strength, and extend the service life of the hinge beam. Moreover, the lug finishing process can be completed in a single clamping operation, improving the overall precision of the hinge beam.

Description

Technical Field

[0001] This invention belongs to the field of superhard material synthesis technology, and specifically relates to a large-cavity forging type six-sided hydraulic press and its preparation method. Background Technology

[0002] The six-sided hydraulic press is a high-pressure assembly equipment for ultra-hard materials, consisting of six hinged beam single-cylinder assemblies connected by 12 pins and lugs. The centerlines of the six hinged beam inner cylinders intersect at a single point. The dimensional and positional tolerance of this intersection point is called alignment, which is a crucial technical condition for the press. The dimensional accuracy of the hinged beam inner cylinders and lugs, as well as their dimensional and positional accuracy, are key factors in ensuring alignment. The machining accuracy of the hinged beam lugs directly affects the assembly accuracy, thus impacting the alignment of the six-sided hydraulic press under high pressure.

[0003] The hinge beams of a six-sided hydraulic press are mainly divided into integral casting and integral forging. The most common type of hinge beam on the market is integral casting. The lugs of cast hinge beams are basically no longer precision-machined, and their shape accuracy mainly relies on the accuracy of the mold. Long-term use of the mold leads to a decrease in the accuracy of the lugs, which affects the overall accuracy of the final hinge beam. Under high pressure, this can seriously affect the centering of the six-sided hydraulic press.

[0004] The forging methods for integral forged hinge beams can currently be divided into two types: free forging and die forging. Free forging results in large forging allowances, high material costs, high processing difficulty, and long processing cycles. Die forging can achieve small forging allowances and has high production efficiency, but it is limited by press tonnage, prone to shape defects, difficult to form, and has an insufficient forging ratio. These problems restrict the further development of larger hinge beams, only meeting the forging requirements for hinge beams with cavities of Ø1000mm and below.

[0005] The Chinese invention patent "A processing device for hinge beam lugs of a six-end face top press" (publication number: CN112024959A) proposes a method for processing hinge beam lugs. The method uses a gantry milling machine for processing. The feed is along the central axis of the hinge beam. Since the hinge beam lugs are relatively high, the feed needs to be made sequentially from both the positive and negative directions of the hinge beam axis. This requires a flipping process of the hinge beam, which changes the processing datum. As a result, tool marks will appear on the processed surface, which need to be removed by manual grinding. The processing accuracy and efficiency cannot be guaranteed. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a large-cavity forged six-sided hydraulic press and its manufacturing method. The hinge beam is formed by free forging and die forging, realizing the forging process of hinge beams with a cavity of Ø1250mm and above, thereby improving the overall technical performance of the six-sided hydraulic press.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] A large-cavity forging type six-sided top hydraulic press includes hinge beam mounting assemblies in six directions: upper, lower, front, rear, left, and right. Adjacent hinge beam mounting assemblies are connected by pins. Each hinge beam mounting assembly includes a hinge beam, a piston, a guide sleeve, and a rear plug. The piston is installed in a cylinder in the middle of the hinge beam, and the rear plug is installed in a rear plug mounting hole at the bottom of the hinge beam. The guide sleeve is fitted on the piston and sealed by a guide sleeve sealing assembly.

[0009] The hinge beam is forged using a combination of free forging and die forging. The free forging produces a plum blossom-shaped intermediate forging billet, while the die forging places the forged intermediate billet into a mold for the final hinge beam forming forging.

[0010] A rear plug sealing assembly is provided between the rear plug and the rear plug mounting hole.

[0011] A method for manufacturing a large-cavity forging type six-sided hydraulic press includes the following steps:

[0012] (1) Material selection: Round steel ingots are selected.

[0013] (2) Heating: The round steel ingot is heated, and multiple heating processes are required during forging, ensuring that the forging temperature is not lower than 950℃;

[0014] (3) Upsetting and drawing: The round steel ingot after step (2) is upsetting and drawing multiple times to break up the carbides in the round steel ingot;

[0015] (4) Free forging intermediate billet

[0016] a. Heat the steel ingot billet after step (3), and then place it on the lower pier plate of the forging press by a robot arm. The end face of the lower pier plate is set as a triangular cross section, and the middle slide of the forging press is equipped with a punch with a triangular cross section to press the steel ingot billet and press its upper and lower symmetrical sides into a concave triangular shape.

[0017] b. Reheat and rotate the steel ingot billet 90°, then repeat step a;

[0018] c. The shape of the steel ingot billet is modified multiple times to obtain a regular plum blossom-shaped forging intermediate billet;

[0019] (5) Die forging

[0020] After reheating, the plum blossom-shaped forging intermediate billet forged in step (4) is placed in the lower mold and thickened to be flush with the mold using a flat upsetting plate. Then, the upper mold, which is similar in shape to the inner cylinder of the hinge beam, is pressed down. The upper mold and the lower mold form a closed mold, and the billet is forged into the shape of the hinge beam and the center hole to obtain the hinge beam forming blank.

[0021] (6) Demolding

[0022] After forging, the material is removed from the worktable, and the formed hinge beam blank is pushed out of the mold.

[0023] (7) Heat treatment after forging

[0024] The hinge beam blank is first normalized at 850℃±10℃, and then tempered at 650℃±10℃ to refine the internal grains of the blank.

[0025] (8) Flaw detection

[0026] The upper and lower end faces of the hinge beam blank after step (7) are machined until there is no black skin on the surface, and then ultrasonic testing is performed.

[0027] (9) The lugs of the hinge beam blank are processed by drilling, sawing and milling.

[0028] The hinge beam blanks that have passed the flaw detection in step (8) will be processed in the following steps:

[0029] d. Drilling process holes for material removal

[0030] e. Sawing the grooves of the ear fan

[0031] f. Cutting the ear fan allowance

[0032] g. Conditioning

[0033] h. Internal cavity finishing

[0034] i. Ear fan precision machining

[0035] j. Ear hole finishing

[0036] This means completing the fine finishing of the ear fan.

[0037] In step (9), d, drilling the material removal process hole, the process is as follows:

[0038] First, place the qualified hinge beam blank vertically on the tooling of the deep hole drilling machine. The bottom surface of the hinge beam blank is pressed against the worktable perpendicular to the drill rod by the pressure rod to align the runout of the drill end face.

[0039] The drill rod is then drilled using a CNC program to create the material removal process holes, with a allowance remaining between adjacent material removal process holes.

[0040] In step (9), e, sawing the ear groove, the process is as follows:

[0041] After the material removal process hole is drilled, it is placed on the band saw table. According to the saw groove reference, it is sawed symmetrically from the outer end face of the hinge beam forming blank to the center of the blank, and sawed to the material removal process hole. The two saw kerfs of the same ear fan are kept parallel, and the sawed ear fan groove retains the machining allowance.

[0042] In step (9), f, cutting the ear fan allowance, the process is as follows:

[0043] After sawing, water jet cutting is used to remove the excess material left between the material removal process holes, thereby completing the removal of the large excess material in the ear fan groove.

[0044] Step (9) h, internal cavity finishing, the process is as follows:

[0045] The process involves rough machining, heat treatment, finish machining, and inner wall surface rolling.

[0046] Furthermore, the inner wall surface is rolled using an ultrasonic rolling device. The rolling blade contacts the inner wall of the hinge beam cylinder and is subjected to high-frequency impact, while the hinge beam rotates with the platform to achieve the surface rolling of the inner wall.

[0047] Step (9), i. Ear fan finishing, the process is as follows:

[0048] Place the bottom surface of the hinge beam forming blank on the worktable of the CNC machining center, align the inner cylinder center with the cylinder port end face reference, and then use a right-angle milling head for milling. The milling cutter head plane of the right-angle milling head is parallel to the ear fan machining plane. The internal gear structure outputs the machine tool spindle power to the milling cutter head, and the machining is performed through the end face of the milling cutter head.

[0049] Then, an extended anti-vibration tool rod is used to process the remaining material at the bottom of the ear fan groove, while retaining the arc at the bottom of the groove to reduce the stress at the root of the ear fan.

[0050] Step (9), j, ear hole finishing, the process is as follows:

[0051] The ear fan is finished by performing rough machining, heat treatment, fine machining, and ear hole surface rolling on the machine tool.

[0052] The machining sequence of the right-angle milling head is to mill the outer and inner sides of the ear fan from the outside to the inside and from the top to the bottom.

[0053] The beneficial effects of this invention are:

[0054] (1) The large cavity forging type six-sided top hydraulic press and its preparation method disclose a hinge beam formed by free forging + die forging, and develop a set of cold working processes for precision machining of hinge beam ear fan, inner cylinder and ear hole, which improves the overall technical performance of the six-sided top hydraulic press. It can realize the forging process of hinge beam with cavity Ø1250mm and above, develop a new generation of high performance superhard material synthesis large six-sided top hydraulic press, and improve the technical level of core equipment in my country's superhard material industry.

[0055] (2) The forging method of the large cavity hinge beam of the present invention adopts a combination of free forging and die forging to forge the hinge beam blank. First, it can achieve near-net-shape precision forming and realize small-allowance forging. Second, the plum blossom-shaped blank formed by free forging can avoid the problem of insufficient forging and uneven structure caused by the limited press tonnage. Third, the forged hinge beam cavity can reach Ø1250mm and above. The drilling, sawing and milling process is used to realize the removal of large allowance of the ear fan and high-precision and high-efficiency processing. The inner wall of the cylinder and the surface of the ear hole are rolled to improve the accuracy and surface roughness, improve the surface strength, increase the working life of the hinge beam, and the ear fan can be finished in one clamping, thus improving the overall accuracy of the hinge beam.

[0056] (3) The present invention can complete the finishing of the hinge beam ear fan in one clamping. Since the depth of the ear fan groove is smaller than its height, the cutting method can be adopted along the central axis of the hinge beam. This processing method is not affected by the height of the hinge beam. The ear fan allowance can be completely processed and removed. There is no need to flip or grind the hinge beam. While improving efficiency, safety is also relatively improved.

[0057] (4) The hinge beam adopts the free forging + die forging forming method, which can effectively improve the problem of large free forging forming, reduce the forging fire of die forging forming, improve material utilization, improve production efficiency, and solve the problem of difficult large-scale forming of hinge beam. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the structure of the present invention;

[0059] Figure 2 This is a schematic diagram of the structure of a free forging intermediate billet. Figure 1 ;

[0060] Figure 3 This is a schematic diagram of the structure of a free forging intermediate billet. Figure 2 ;

[0061] Figure 4 This is a schematic diagram of the structure of a plum blossom-shaped forging intermediate billet;

[0062] Figure 5 This is a structural schematic diagram of the hinge beam forming blank;

[0063] Figure 6 This is a process diagram for removing large excess material from the ear fan;

[0064] Figure 7 This is a schematic diagram showing the precision machining position of the ear fan;

[0065] Figure 8 This is a side view of the precision-machined ear fan;

[0066] Figure 9 This is the main view of the ear fan finishing process; Detailed Implementation

[0067] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0068] This invention provides a large-cavity forging type six-sided hydraulic press and its manufacturing method, such as... Figures 1 to 9 As shown.

[0069] This large-cavity forging type six-sided hydraulic press includes hinge beam mounting assemblies in six directions: upper, lower, front, rear, left, and right. Adjacent hinge beam mounting assemblies are connected by pins. Each hinge beam mounting assembly includes a hinge beam 1, a piston 4, a guide sleeve 3, and a rear plug 5. The piston 4 is installed in a cylinder in the middle of the hinge beam 1. The rear plug 5 is installed in a rear plug mounting hole at the bottom of the hinge beam 1. A rear plug sealing assembly is provided between the rear plug 5 and the rear plug mounting hole. The guide sleeve 3 is fitted on the piston 4 and sealed by the guide sleeve sealing assembly.

[0070] The hinge beam 1 is forged using a combination of free forging and die forging. Free forging produces a plum blossom-shaped forging intermediate billet, while die forging places the free-forged intermediate billet in a die for the final hinge beam forming. The forming methods for large-cavity forged hinge beams are generally divided into free forging and die forging. Free forging results in a large allowance and low material utilization; die forging can achieve small allowance forging, but for further enlargement of the hinge beam, die forging is limited by press tonnage, making forming difficult and prone to problems such as insufficient forging and coarse grains. Therefore, this invention combines free forging and die forging for the final large-cavity forged hinge beam forming, effectively improving the large allowance problem of free forging, reducing the number of forging passes in die forging, increasing material utilization, and improving production efficiency.

[0071] This invention discloses a method for manufacturing a large-cavity forging type six-sided hydraulic press, comprising the following process steps:

[0072] (1) Material selection:

[0073] The selected material is a round steel ingot made of 42CrMo. According to the calculation, the blank size and weight of the Ø1250mm hinge beam is about 32t, and the size of the steel ingot is Ø1500mm*2700mm.

[0074] (2) Heating: The round steel ingot is heated. In this embodiment, it is heated to 1240℃±10℃, and multiple heatings are required during the forging process to ensure that the forging temperature is not lower than 950℃.

[0075] (3) Upsetting and drawing: The round steel ingot after step (2) is subjected to multiple upsetting and drawing processes to break up the carbides in the round steel ingot; In this embodiment, the round steel ingot is upset and drawn three times to break up the carbides in the steel ingot, so that they are evenly distributed and the comprehensive performance of the steel ingot is improved. The final steel ingot size is Ø1560mm*2180mm.

[0076] (4) Free forging intermediate billet

[0077] a. The steel ingot billet after upsetting and drawing in step (3) is reheated, and then held by a robotic arm and placed on the lower pier plate of a 16,000-ton forging press. The end face of the lower pier plate is set with a triangular cross section, and the middle slide of the forging press is equipped with a punch with a triangular cross section to apply pressure to the steel ingot billet, pressing its upper and lower symmetrical sides into a concave triangular shape, such as... Figure 2 As shown

[0078] b. Reheat and rotate the steel ingot billet 90°, as follows: Figure 3 As shown, repeat step a;

[0079] c. The shape of the steel ingot billet is modified multiple times to obtain a regular plum blossom-shaped forging intermediate billet, such as... Figure 4 As shown;

[0080] (5) Die forging

[0081] After reheating, the plum blossom-shaped forging intermediate billet forged in step (4) is placed in the lower mold and uplifted to be flush with the mold using a flat upsetting plate. Then, the upper mold, which is similar in shape to the inner cylinder of the hinge beam, is used to press it down. The upper mold and the lower mold form a closed mold, and the shape of the inner cavity of the mold is consistent with the shape of the hinge beam. The billet is forged to form the shape of the hinge beam and the center hole, thus obtaining the hinge beam forming blank, such as Figure 5 As shown;

[0082] (6) Demolding

[0083] After forging, the material is removed from the worktable, and the formed hinge beam blank is ejected from the mold using a hydraulic ejection device to achieve rapid demolding.

[0084] (7) Heat treatment after forging

[0085] The hinge beam blank is first normalized at 850℃±10℃, and then tempered at 650℃±10℃ to refine the internal grains of the blank.

[0086] (8) Flaw detection

[0087] On a vertical lathe, the upper and lower end faces of the hinge beam forming blank processed in step (7) are machined until there is no black skin on the surface, and then ultrasonic testing is performed; products that fail the test are scrapped, and products that pass the test are processed in the next step.

[0088] (9) The lugs of the hinge beam blank are processed by drilling, sawing and milling.

[0089] Because the lugs of the forged hinge beam blank are forged as a whole, the lugs have a large allowance and are difficult to process. This invention provides a drilling, sawing, and milling process integration technology for the lugs, which can achieve large allowance removal and high-precision, efficient finishing of the lugs, inner cavity, and lug holes. The specific implementation steps are as follows:

[0090] The hinge beam blanks that have passed the flaw detection in step (8) will be processed in the following steps:

[0091] d. Drilling process holes for material removal

[0092] First, place the qualified hinge beam blank vertically on the tooling of the deep hole drilling machine. The bottom surface of the hinge beam blank is pressed against the worktable perpendicular to the drill rod by the pressure rod to align the runout of the drill end face.

[0093] Subsequently, the drill rod of the deep hole drilling machine is drilled through the CNC program to process the material removal process holes, and a 2-3mm allowance is left between each two adjacent material removal process holes. The hinge beam blank has a total of 6 lug grooves, so it is necessary to open 6 groups of 36 material removal process holes on the deep hole drilling machine.

[0094] e. Sawing the grooves of the ear fan

[0095] After drilling the process hole for removing material, place it on the worktable of a band saw. The band saw is equipped with a rigid saw blade. Based on the saw groove reference processed in the previous process, saw cut symmetrically from the outer end face of the hinge beam blank towards the center of the hinge beam blank, cutting to the process hole. The two saw kerfs on the same lug remain parallel. A 2-3mm machining allowance is retained in the sawn lug groove. Figure 6 As shown.

[0096] f. Cutting the ear fan allowance

[0097] After sawing, water jet cutting is used to remove the excess material between the process holes, thereby completing the removal of a large amount of material from the ear-shaped groove. The entire processing is carried out using cold working methods, which ensures the material properties of the hinge beam forming blank.

[0098] g. Conditioning

[0099] Subsequently, the hinge beam blank undergoes a key heat treatment process—quenching and tempering, which involves quenching at 850℃ for 8 hours, cooling with quenching liquid, and tempering at 610℃ for 16 hours with air cooling to further improve the material properties.

[0100] h. Internal cavity finishing

[0101] The inner cavity of the hinge beam is the working area of ​​the hydraulic oil, and its inner wall is in contact with the seal. This requires the inner cylinder surface to have a certain hardness and a high roughness grade. Therefore, the inner cavity machining method of this large-cavity forging six-sided top press is: rough machining - heat treatment - finish machining - inner wall surface rolling. Among them, the surface rolling uses ultrasonic rolling equipment. The rolling cutter contacts the inner wall of the hinge beam cylinder, achieving a high-frequency impact of 30,000 times per second, applying a certain pressure to the inner cavity surface. The hinge beam rotates with the platform to achieve the surface rolling of the inner wall. Rolling can eliminate tool marks, improve the surface roughness grade of the inner wall of the cylinder to Ra0.16µm, and also has a surface hardening effect, which can increase the surface hardness by 20%~30%, thereby improving the machining accuracy of the inner wall and the service life of the cylinder.

[0102] i. Ear fan precision machining

[0103] The finishing of the hinge fan is completed on a CNC machining center after the inner cylinder is precision turned. The bottom surface of the hinge beam is placed on the worktable, and the center of the inner cylinder is aligned with the reference surface of the cylinder port.

[0104] The ear fan is milled using a right-angle milling head 9, such as Figure 8 and Figure 9 As shown, the milling cutter head 9 has a plane parallel to the lug machining plane. The internal gear structure outputs power from the machine tool spindle 91 to the milling cutter head. Machining is performed through the end face of the milling cutter head, enabling efficient and high-precision machining of the inner and outer surfaces of the lug. Specifically, milling is performed from the outside in and from top to bottom on the outer surface 2-3 and the inner surface 2-2 of the lug. Figure 7 As shown;

[0105] The bottom 2-1 of the ear fan groove uses an extended anti-vibration tool bar to remove excess material from the bottom of the ear fan groove while retaining the rounded arc of the groove bottom to reduce stress at the root of the ear fan. This processing method developed in this invention allows the ear fan to be finished in a single clamping operation.

[0106] j. Ear hole finishing

[0107] The ear hole is subjected to rough machining, heat treatment, fine machining, and ear hole surface rolling in sequence on the machine tool to improve the surface hardness and roughness of the ear hole. The ear hole accuracy reaches 0.03mm and the roughness reaches Ra0.16µm. The shape and position accuracy of the ear hole and inner cavity can reach within 0.05mm, ensuring the centering of the whole machine.

[0108] The forging method for the large-cavity hinge beam of this invention employs a combination of free forging and die forging to forge the hinge beam blank. Firstly, it achieves near-net-shape precision forming, enabling small-margin forging. Secondly, the plum blossom-shaped blank formed by free forging avoids insufficient forging and uneven microstructure caused by press tonnage limitations. Thirdly, the forged hinge beam cavity can reach Ø1250mm and above. Furthermore, it utilizes a combined drilling, sawing, and milling process to achieve large-margin removal of the lugs and high-precision, high-efficiency machining. Roll pressing is used on the inner wall of the cylinder and the surface of the lugs to improve precision and surface roughness, increase surface strength, and extend the service life of the hinge beam. Moreover, the lug finishing process can be completed in a single clamping operation, improving the overall precision of the hinge beam.

[0109] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

[0110] In the description of this invention, it should be understood that the terms "front", "rear", "left", "right", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

Claims

1. A method for manufacturing a large-cavity forging type six-sided hydraulic press, characterized in that, Includes the following steps: (1) Material selection: Round steel ingots are selected. (2) Heating: The round steel ingot is heated, and multiple heating processes are required during forging, ensuring that the forging temperature is not lower than 950℃; (3) Upsetting and drawing: The round steel ingot after step (2) is upsetting and drawing multiple times to break up the carbides in the round steel ingot; (4) Free forging intermediate billet a. Heat the steel ingot billet after step (3), and then place it on the lower pier plate of the forging press by a robot arm. The end face of the lower pier plate is set as a triangular cross section, and the middle slide of the forging press is equipped with a punch with a triangular cross section to press the steel ingot billet and press its upper and lower symmetrical sides into a concave triangular shape. b. Reheat and rotate the steel ingot billet 90°, then repeat step a; c. The shape of the steel ingot billet is modified multiple times to obtain a regular plum blossom-shaped forging intermediate billet; (5) Die forging After reheating, the plum blossom-shaped forging intermediate billet forged in step (4) is placed in the lower mold and thickened to be flush with the mold using a flat upsetting plate. Then, the upper mold, which is similar in shape to the inner cylinder of the hinge beam, is pressed down. The upper mold and the lower mold form a closed mold, and the billet is forged into the shape of the hinge beam and the center hole to obtain the hinge beam forming blank. (6) Demolding The pressed hinge beam blank is pushed out of the mold; (7) Heat treatment after forging The hinge beam blank is first normalized at 850℃±10℃, and then tempered at 650℃±10℃ to refine the internal grains of the blank. (8) Flaw detection The upper and lower end faces of the hinge beam blank after step (7) are machined until there is no black skin on the surface, and then ultrasonic testing is performed. (9) The hinge beam blanks that have passed the flaw detection in step (8) shall be processed in the following steps: d. Drilling process holes for material removal, the steps are as follows: First, place the qualified hinge beam blank vertically on the tooling of the deep hole drilling machine. The bottom surface of the hinge beam blank is pressed against the worktable perpendicular to the drill rod by the pressure rod to align the runout of the drill end face. The drill rod is then drilled through a CNC program to create the material removal process holes, with a allowance remaining between adjacent material removal process holes. e. Sawing the grooves in the lugs, the steps are as follows: After the material removal process hole is drilled, the hinge beam forming blank is placed on the band saw worktable. According to the saw groove reference, the hinge beam forming blank is sawed symmetrically from the outer end face to the center of the blank, and sawed to the material removal process hole. The two saw kerfs of the same ear fan are kept parallel, and the sawed ear fan groove retains the machining allowance. f. Cut off the excess material from the ear fan, the process is as follows: After sawing, water jet cutting is used to remove the excess material left between the material removal process holes, thereby completing the large-scale removal of the ear fan groove. g. Conditioning h. Internal cavity finishing i. Fine machining of the ear fan, the process is as follows: The bottom surface of the hinge beam blank is placed on the worktable of the CNC machining center. The center of the inner cylinder is aligned with the reference of the cylinder end face. Then, a right-angle milling head is used for milling. The feed method is perpendicular to the central axis of the hinge beam, and the milling cutter head plane of the right-angle milling head is parallel to the lug machining plane. The internal gear structure outputs the power of the machine tool spindle to the milling cutter head, and the machining is performed through the end face of the milling cutter head. Then, an extended anti-vibration tool bar is used to process the remaining material at the bottom of the ear fan groove, while retaining the arc at the bottom of the groove to reduce the stress at the root of the ear fan. j. Ear hole finishing.

2. The method for preparing a large-cavity forging type six-sided hydraulic press according to claim 1, characterized in that: Step (9) h, internal cavity finishing, the process is as follows: The process involves rough machining, heat treatment, finish machining, and inner wall surface rolling. Furthermore, the inner wall surface is rolled using an ultrasonic rolling device. The rolling blade contacts the inner wall of the hinge beam cylinder and is subjected to high-frequency impact, while the hinge beam rotates with the platform to achieve the surface rolling of the inner wall.

3. The method for preparing a large-cavity forging type six-sided hydraulic press according to claim 1, characterized in that: Step (9), j, ear hole finishing, the process is as follows: The machine tool performs rough machining, heat treatment, finish machining, and ear hole surface rolling in sequence.

4. The method for preparing a large-cavity forging type six-sided hydraulic press according to claim 1, characterized in that: The machining sequence of the right-angle milling head is to mill the outer and inner sides of the ear fan from the outside to the inside and from the top to the bottom.

5. A large-cavity forging type six-sided hydraulic press, prepared according to the preparation method of the large-cavity forging type six-sided hydraulic press according to any one of claims 1 to 4, characterized in that: It includes hinge beam mounting assemblies in six directions: up, down, front, back, left, and right. Adjacent hinge beam mounting assemblies are connected by pins. Each hinge beam mounting assembly includes a hinge beam, a piston, a guide sleeve, and a rear plug. The piston is installed in a cylinder in the middle of the hinge beam, and the rear plug is installed in a rear plug mounting hole at the bottom of the hinge beam. The guide sleeve is fitted on the piston and sealed by a guide sleeve sealing assembly. The hinge beam is forged using a combination of free forging and die forging. The free forging produces a plum blossom-shaped intermediate forging billet, while the die forging places the forged intermediate billet into a mold for the final hinge beam forming forging.

6. A large-cavity forging type six-sided hydraulic press according to claim 5, characterized in that: A rear plug sealing assembly is provided between the rear plug and the rear plug mounting hole.

Images