Cogging type forging process and method

Abstract

The invention provides a cogging type forging process and method, and the cogging type forging process comprises the following steps: S1, heating: putting a raw material into a heating chamber, and then carrying out primary heating on the raw material through a heating furnace at the primary heating temperature of 1050-1250 DEG C; s2, upsetting is conducted, specifically, the heated raw materials are placed on forging equipment, and primary upsetting operation is conducted; according to the cogging type forging process and method, by adopting a uniform heating mode, the temperature can be accurately controlled, it is ensured that raw materials reach a specific forging temperature interval, the raw materials are prevented from being overheated or overburnt, and therefore it is ensured that the product quality is stable; the compression ratio of the primary upsetting operation is controlled within a specific range, so that the internal structure of the raw material can be effectively improved, the shape of the blank can be conveniently determined, and subsequent machining is prevented from being influenced; and meanwhile, the forging ratio and the feeding amount are controlled in the drawing-out process, the uniformity and compactness of the blank are ensured, and the product quality can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of forging, and in particular to an open-blade forging process and method. Background Art

[0002] With the continuous development of industry, forging technology plays a vital role in machinery manufacturing, aerospace, automobile and other fields.

[0003] As an important forging process, open forging can improve the internal structure of the raw materials, improve the density and uniformity of the materials, and lay a good foundation for subsequent forging processes by performing preliminary upsetting and drawing operations on the raw materials in the open forging stage.

[0004] However, in actual applications, the existing open-blank forging process is difficult to ensure that the raw materials reach a specific forging temperature range due to the lack of accurate temperature control means, which may cause overheating or overburning of the raw materials, affecting the internal structure and performance of the product; and in the upsetting operation, there is no reasonable process guidance, the internal structure of the raw materials cannot be effectively improved, and it is difficult to accurately determine the shape of the blank, affecting subsequent processing; in multi-pass drawing operations, the forging ratio and feed amount cannot be accurately controlled, which easily makes the blank uneven and non-dense, reducing the quality of the product.

[0005] Therefore, it is necessary to provide a blank forging process and method to solve the above technical problems. Summary of the invention

[0006] The invention provides an open blank forging process and method, which solves the problems of affecting the internal structure and performance of the product, being difficult to accurately determine the shape of the blank, affecting subsequent processing and reducing the quality of the product.

[0007] In order to solve the above technical problems, the present invention provides a blank forging process, comprising the following steps:

[0008] S1. Heating: Put the raw materials into the heating chamber, and then heat the raw materials once through the heating furnace, and the heating temperature is 1050℃~1250℃;

[0009] S2, upsetting: Place the heated raw material on the forging equipment and perform the initial upsetting operation to improve the internal structure of the raw material and preliminarily determine the shape of the billet;

[0010] S3, drawing: the blank that has been initially upset in S2 is put back into the heating chamber in S1 for secondary heating at a temperature of 800°C to 900°C, then an anvil is installed on the forging equipment in S2, and the anvil is driven up and down by the forging equipment to draw the blank once, then the blank is put back into the heating chamber in S1 for tertiary heating at a temperature of 900°C to 980°C, then the blank is drawn for a second time, and the forging ratio (forging ratio is 1.8 to 4.8) and the feed amount are controlled during the drawing process to ensure the uniformity and density of the blank;

[0011] S4, shaping: further shaping operation is performed on the blank according to the shape requirements of the required forged product;

[0012] S5. Finishing: Final forging is performed on the shaped billet to obtain forged products with dimensional accuracy and surface quality that meet the requirements.

[0013] Preferably, a uniform heating method is adopted during the heating process to ensure the consistency of the temperature of the raw materials.

[0014] Preferably, the forging ratio calculation formula is y=F0 / F1 or y=L1 / L0, wherein F0 and L0 are the cross-sectional area and length of the ingot or billet before drawing, and F1 and L1 are the cross-sectional area and length of the ingot or billet after drawing. The feed amount calculation formula is KL=F0 / F. If the length of the deformation zone of the billet before drawing is defined as l0, the width as b0, and the height as h0, then l0 is called the feed amount, and l0 / h0 is called the relative feed amount.

[0015] Preferably, a forging device is required in step S2, and the forging device comprises a base plate, a forging table is fixedly mounted on the top of the base plate, and a forging device body is also fixedly mounted on the top of the base plate.

[0016] Preferably, a protective frame is provided on the outer side surface of the forging table, the bottom of the protective frame is fixedly installed on the top of the base plate, fixing plates are fixedly installed on both sides of the inner side surface of the protective frame, a collection frame is provided on the top of the fixing plate, and a handle is fixedly installed on the side of the collection frame.

[0017] Preferably, positioning grooves are provided on the inner side surfaces at both ends of the collecting frame, and blocking components are provided on the inner side surfaces at both ends of the collecting frame.

[0018] Preferably, the blocking assembly includes a baffle, a slide groove, a slide cavity, a positioning plate, a sliding plate and a spring, the baffle being arranged on the inner side surface of the collection frame, the slide groove being opened at both ends of the side surface of the baffle, the slide cavity being opened inside both ends of the baffle, the positioning plate being slidably connected to the inner side surface of the slide cavity, the sliding plate being slidably connected to the inner side surface of the slide groove, one end of the sliding plate being fixedly mounted on the side surface of the positioning plate, one end of the positioning plate being clamped on the inner side surface of the positioning groove, the spring being fixedly mounted on the other end of the positioning plate, and one end of the spring being fixedly mounted on the inner side surface of the slide cavity.

[0019] Preferably, locking screws are threadedly connected to the interior of both sides of the protection frame, and one end of the locking screws abuts against the side surface of the collection frame.

[0020] In order to solve the above problems, the present invention also provides a blank forging method, comprising the following steps:

[0021] S1. Select materials;

[0022] S2. Performing forging operation according to the open blank forging process described in claims 1 to 8;

[0023] S21, placing the material selected in S1 into a heating furnace, and then heating the heating furnace plate to 600°C-650°C, and keeping it at this temperature for 1-2 hours; then heating to 1050°C-1250°C at a heating rate of 90°C / h, and keeping it at this temperature for 1-2 hours, so that the material is evenly heated;

[0024] S22, placing the raw materials heated in S21 on the forging equipment for forging, with an overall forging ratio of 1.8 to 4.8, and a pressing speed of the cone anvil of 70 mm / s. When the cone anvil presses down the most, that is, when the pressing rate is 50% to 60%, the pressure is maintained for 5 to 10 minutes to extend the contact time of the upper and lower strain cores; during upsetting, the upper and lower cone anvils must be preheated to 250°C to 300°C to avoid temperature stress caused by too fast temperature drop in the forging part where the upper and lower cone anvils contact; the part where the upper and lower cone anvils contact the end face of the forging is covered with glass powder to reduce the friction of the upper and lower contact surfaces, reduce the range of the difficult deformation area, and improve the uniform deformation degree of upsetting until the forging is forged into a cuboid;

[0025] S23. When the upsetting of the frustum anvil is finished, the cylindrical frustum anvil is removed with a large clamp, and then the narrow flat anvil is installed on the forging equipment to perform two axial elongation operations on the forging. The relative feed amount L / H of the elongation is 0.7-0.8, where L is the feed amount of the upper anvil, H is the height of the rectangular forging, and the pressing rate of the upper anvil is 20%-35%. After one elongation operation, the blank is rotated 90° along the axial direction. Before the elongation operation, the raw material in S22 needs to be heated to 800-900°C, and then the elongation operation is performed. After one elongation operation, the raw material needs to be heated to 900-980°C again, and then the elongation operation is performed twice, until the elongation is reached to the predetermined size.

[0026] S24, shaping the raw material after the lengthening in S23 into the shape of the required forged product, and then performing final forging through forging equipment to achieve the product with composite requirements;

[0027] S3. After the final forging is completed, the forgings are subjected to normalizing and low-temperature annealing treatments in sequence. First, the forgings are heated to 800°C to 900°C and kept at this temperature for 10 to 12 hours. The forgings are taken out for air cooling to 250°C to 300°C, and then slowly heated to 550°C to 600°C again and cooled with the furnace.

[0028] S4. Carry out quality inspection on the forged products after cooling, including inspection of dimensional accuracy, surface quality and internal structure.

[0029] Preferably, during the quality inspection process, a combination of non-destructive testing and destructive testing is used to ensure that the quality of the forged products meets standard requirements.

[0030] Compared with the related art, the open-blade forging process and method provided by the present invention has the following beneficial effects:

[0031] The present invention provides an open blank forging process and method. By adopting a uniform heating method, the temperature can be accurately controlled to ensure that the raw material reaches a specific forging temperature range, avoiding overheating or overburning of the raw material, thereby ensuring stable product quality; and by controlling the compression ratio of the initial upsetting operation within a specific range, the internal structure of the raw material can be effectively improved, the shape of the blank can be determined, and subsequent processing can be avoided; at the same time, the forging ratio and feed amount are controlled during the drawing process to ensure the uniformity and density of the blank, thereby effectively improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of a preferred embodiment of a forging device for an open-blade forging process provided by the present invention;

[0033] Figure 2 for Figure 1 The schematic diagram of the collection frame structure from top view shown;

[0034] Figure 3 for Figure 2 A schematic diagram of the side structure of the blocking assembly shown;

[0035] Figure 4 for Figure 3 A schematic diagram of the side cross-sectional structure of the blocking assembly shown;

[0036] Figure 5 for Figure 2 The schematic diagram of the cross-sectional structure of the collection frame shown in the top view;

[0037] Figure 6 for Figure 1 An enlarged schematic diagram of part A is shown.

[0038] Numbers in the figure: 1, bottom plate, 11, forging table, 12, forging equipment body, 2, protection frame, 21, fixing plate, 22, locking screw, 3, collection frame, 31, handle, 32, positioning groove, 4, blocking assembly, 41, baffle, 42, slide groove, 43, slide cavity, 44, positioning plate, 45, sliding plate, 46, spring. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of a forging device for an open-blade forging process provided by the present invention; Figure 2 for Figure 1 The schematic diagram of the collection frame structure from top view shown; Figure 3 for Figure 2 A schematic diagram of the side structure of the blocking assembly shown; Figure 4 for Figure 3 A schematic diagram of the side cross-sectional structure of the blocking assembly shown; Figure 5 for Figure 2 The schematic diagram of the cross-sectional structure of the collection frame shown in the top view; Figure 6 for Figure 1 An enlarged schematic diagram of part A is shown. A blank forging process comprises the following steps:

[0041] S1. Heating: Put the raw materials into the heating chamber, and then heat the raw materials once through the heating furnace, and the heating temperature is 1050℃~1250℃;

[0042] S2, upsetting: Place the heated raw material on the forging equipment and perform the initial upsetting operation to improve the internal structure of the raw material and preliminarily determine the shape of the billet;

[0043] S3, drawing: the blank that has been initially upset in S2 is put back into the heating chamber in S1 for secondary heating at a temperature of 800°C to 900°C, then an anvil is installed on the forging equipment in S2, and the anvil is driven up and down by the forging equipment to draw the blank once, then the blank is put back into the heating chamber in S1 for tertiary heating at a temperature of 900°C to 980°C, then the blank is drawn for a second time, and the forging ratio (forging ratio is 1.8 to 4.8) and the feed amount are controlled during the drawing process to ensure the uniformity and density of the blank;

[0044] S4, shaping: further shaping operation is performed on the blank according to the shape requirements of the required forged product;

[0045] S5. Finishing: Final forging is performed on the shaped billet to obtain forged products with dimensional accuracy and surface quality that meet the requirements.

[0046] A uniform heating method is adopted in the heating process to ensure the consistency of the temperature of the raw materials.

[0047] The forging ratio calculation formula is y=F0 / F1 or y=L1 / L0, wherein F0 and L0 are the cross-sectional area and length of the ingot or billet before drawing, and F1 and L1 are the cross-sectional area and length of the ingot or billet after drawing. The feed amount calculation formula is KL=F0 / F. If the length of the deformation zone of the billet before drawing is defined as l0, the width as b0, and the height as h0, then l0 is called the feed amount, and l0 / h0 is called the relative feed amount.

[0048] In the step S2 , a forging device is required, and the forging device comprises a base plate 1 , a forging table 11 is fixedly mounted on the top of the base plate 1 , and a forging device body 12 is also fixedly mounted on the top of the base plate 1 .

[0049] A protective frame 2 is provided on the outer side of the forging table 11, the bottom of the protective frame 2 is fixedly installed on the top of the base plate 1, and fixed plates 21 are fixedly installed on both sides of the inner side of the protective frame 2. A collection frame 3 is provided on the top of the fixed plate 21, and a handle 31 is fixedly installed on the side of the collection frame 3.

[0050] By setting a protective frame 2 on the outer side of the forging table 11, it is possible to prevent the slag from splashing when the forging equipment body 12 is forging the blank, thereby increasing safety and facilitating the user to collect and process the slag later;

[0051] By installing the fixing plates 21 on both sides of the inner side of the protection frame 2, the fixing plates 21 can support the collection frame 3 when in use.

[0052] The inner side surfaces at both ends of the collecting frame 3 are provided with positioning grooves 32 , and the inner side surfaces at both ends of the collecting frame 3 are provided with blocking components 4 .

[0053] The collecting frame 3 is arranged at the bottom of the forging table 11 , so that when in use, the slag generated during forging can fall to the inner side of the collecting frame 3 , so that the user can collect and process it later.

[0054] The blocking assembly 4 includes a baffle 41, a slide groove 42, a slide cavity 43, a positioning plate 44, a sliding plate 45 and a spring 46. The baffle 41 is arranged on the inner side surface of the collection frame 3, the slide groove 42 is opened at both ends of the side surface of the baffle 41, the slide cavity 43 is opened inside the two ends of the baffle 41, the positioning plate 44 is slidably connected to the inner side surface of the slide cavity 43, the sliding plate 45 is slidably connected to the inner side surface of the slide groove 42, one end of the sliding plate 45 is fixedly installed on the side surface of the positioning plate 44, one end of the positioning plate 44 is clamped on the inner side surface of the positioning groove 32, the spring 46 is fixedly installed on the other end of the positioning plate 44, and one end of the spring 46 is fixedly installed on the inner side surface of the slide cavity 43.

[0055] The positioning plate 44 is inserted into the inner side of the positioning groove 32 , so that when in use, it can limit the baffle 41 , thereby blocking the opening of the collection frame 3 to prevent slag from falling.

[0056] The inside of both sides of the protection frame 2 are both threadedly connected with locking screws 22 , and one end of the locking screw 22 abuts against the side surface of the collection frame 3 .

[0057] By threading the locking screws 22 inside the two sides of the protection frame 2, the collection frame 3 can be limited when in use to prevent the collection frame 3 from moving.

[0058] When in use, the blank to be forged is placed on the forging table 11, and then the collection frame 3 is placed on the top of the fixing plate 21, and the collection frame 3 is at the bottom of the forging table 11. Then the user turns the locking screw 22 to make the locking screw 22 threadedly connected inside the protective frame 2, and then one end of the locking screw 22 abuts against the side of the collection frame 3, thereby limiting the collection frame 2. At this time, the blank is forged by the forging equipment body 12, and the slag generated during forging falls to the inner side of the collection frame 3 to prevent the slag from falling to the ground, so that the user can clean it up later.

[0059] When the forging is completed and the collected slag needs to be collected, the user can reverse the locking screw 22 to make one end of the locking screw 22 away from the collection frame 3, and then the user pulls the handle 31 to make the bottom of the collection frame 3 slide on the top of the fixing plate 21, so as to disassemble the collection frame 3, and then the user pushes the two sliding plates 45 installed on a baffle 41, so that the sliding plate 45 slides on the inner side of the slide groove 42, and then drives the positioning plate 44 to slide on the inner side of the slide cavity 43, and then makes the positioning plate 44 squeeze the spring 46, and makes the other end of the positioning plate 44 move out from the inner side of the positioning groove 32, so that the user can take out the baffle 41 from the inside of the two ends of the collection frame 3, and at this time the user can pour out the slag on the inner side of the collection frame 3, which is convenient for the user to deal with the generated slag.

[0060] Compared with the related art, the open blank forging process provided by the present invention has the following beneficial effects:

[0061] By adopting a uniform heating method, the temperature can be accurately controlled to ensure that the raw materials reach a specific forging temperature range, avoiding overheating or overburning of the raw materials, thereby ensuring stable product quality; and by controlling the compression ratio of the initial upsetting operation within a specific range, the internal structure of the raw materials can be effectively improved, making it easier to determine the shape of the billet and avoiding affecting subsequent processing; at the same time, the forging ratio and feed amount are controlled during the drawing process to ensure the uniformity and density of the billet, which can effectively improve the quality of the product.

[0062] In order to solve the above problems, the present invention also provides a blank forging method, comprising the following steps:

[0063] S1. Select materials;

[0064] S2. Performing forging operation according to the open blank forging process described in claims 1 to 8;

[0065] S21, placing the material selected in S1 into a heating furnace, and then heating the heating furnace plate to 600°C-650°C, and keeping it at this temperature for 1-2 hours; then heating to 1050°C-1250°C at a heating rate of 90°C / h, and keeping it at this temperature for 1-2 hours, so that the material is evenly heated;

[0066] S22, placing the raw materials heated in S21 on the forging equipment for forging, with an overall forging ratio of 1.8 to 4.8, and a pressing speed of the cone anvil of 70 mm / s. When the cone anvil presses down the most, that is, when the pressing rate is 50% to 60%, the pressure is maintained for 5 to 10 minutes to extend the contact time of the upper and lower strain cores; during upsetting, the upper and lower cone anvils must be preheated to 250°C to 300°C to avoid temperature stress caused by too fast temperature drop in the forging part where the upper and lower cone anvils contact; the part where the upper and lower cone anvils contact the end face of the forging is covered with glass powder to reduce the friction of the upper and lower contact surfaces, reduce the range of the difficult deformation area, and improve the uniform deformation degree of upsetting until the forging is forged into a cuboid;

[0067] S23. When the upsetting of the frustum anvil is finished, the cylindrical frustum anvil is removed with a large clamp, and then the narrow flat anvil is installed on the forging equipment to perform two axial elongation operations on the forging. The relative feed amount L / H of the elongation is 0.7-0.8, where L is the feed amount of the upper anvil, H is the height of the rectangular forging, and the pressing rate of the upper anvil is 20%-35%. After one elongation operation, the blank is rotated 90° along the axial direction. Before the elongation operation, the raw material in S22 needs to be heated to 800-900°C, and then the elongation operation is performed. After one elongation operation, the raw material needs to be heated to 900-980°C again, and then the elongation operation is performed twice, until the elongation is reached to the predetermined size.

[0068] S24, shaping the raw material after the lengthening in S23 into the shape of the required forged product, and then performing final forging through forging equipment to achieve the product with composite requirements;

[0069] S3. After the final forging is completed, the forgings are subjected to normalizing and low-temperature annealing treatments in sequence. First, the forgings are heated to 800°C to 900°C and kept at this temperature for 10 to 12 hours. The forgings are taken out for air cooling to 250°C to 300°C, and then slowly heated to 550°C to 600°C again and cooled with the furnace.

[0070] S4. Carry out quality inspection on the forged products after cooling, including inspection of dimensional accuracy, surface quality and internal structure.

[0071] Preferably, during the quality inspection process, a combination of non-destructive testing and destructive testing is used to ensure that the quality of the forged products meets standard requirements.

[0072] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A blank forging process, characterized in that: The following steps are involved: S1. Heating: Place the raw materials into the heating chamber, and then heat the raw materials once in the heating furnace. The heating temperature is 1050℃~1250℃; S2, upsetting: Place the heated raw material on the forging equipment and perform the initial upsetting operation to improve the internal structure of the raw material and preliminarily determine the shape of the blank; S3, drawing: the blank that has undergone the initial upsetting in S2 is placed back into the heating chamber in S1 for secondary heating at a temperature of 800°C to 900°C. An anvil is then installed on the forging equipment in S2, and the anvil is moved up and down by the forging equipment to draw the blank once. The blank is then placed back into the heating chamber in S1 for a third heating at a temperature of 900°C to 980°C. The blank is then drawn for a second time. During the drawing process, the forging ratio (forging ratio is 1.8 to 4.8) and feed amount are controlled to ensure the uniformity and density of the blank. S4, shaping: further shaping the blank according to the shape requirements of the desired forged product; S5. Finishing: Final forging is performed on the shaped billet to obtain a forged product with dimensional accuracy and surface quality that meets the requirements.

2. The open forging process according to claim 1, characterized in that: A uniform heating method is adopted during the heating process to ensure the consistency of the temperature of the raw materials.

3. The open forging process according to claim 1, characterized in that: The forging ratio calculation formula is y=F0 / F1 or y=L1 / L0, where F0 and L0 are the cross-sectional area and length of the ingot or billet before drawing, and F1 and L1 are the cross-sectional area and length of the ingot or billet after drawing. The feed amount calculation formula is KL=F0 / F. If the length of the deformation zone of the billet before drawing is defined as l0, the width as b0, and the height as h0, then l0 is called the feed amount, and l0 / h0 is called the relative feed amount.

4. The open forging process according to claim 1, characterized in that: In the step S2, a forging device is required. The forging device includes a base plate, a forging table is fixedly mounted on the top of the base plate, and a forging device body is also fixedly mounted on the top of the base plate.

5. The open forging process according to claim 4, characterized in that: A protective frame is provided on the outer side of the forging table, the bottom of the protective frame is fixedly installed on the top of the base plate, fixed plates are fixedly installed on both sides of the inner side of the protective frame, a collection frame is provided on the top of the fixed plate, and handles are fixedly installed on the sides of the collection frame.

6. The open forging process according to claim 5, characterized in that: The inner side surfaces at both ends of the collecting frame are provided with positioning grooves, and the inner side surfaces at both ends of the collecting frame are provided with blocking components.

7. The open forging process according to claim 6, characterized in that: The blocking assembly includes a baffle, a slide groove, a slide cavity, a positioning plate, a sliding plate and a spring, the baffle being arranged on the inner side surface of the collection frame, the slide groove being opened at both ends of the baffle side surface, the slide cavity being opened inside the two ends of the baffle, the positioning plate being slidably connected to the inner side surface of the slide cavity, the sliding plate being slidably connected to the inner side surface of the slide groove, one end of the sliding plate being fixedly mounted on the side surface of the positioning plate, one end of the positioning plate being clamped on the inner side surface of the positioning groove, the spring being fixedly mounted on the other end of the positioning plate, and one end of the spring being fixedly mounted on the inner side surface of the slide cavity.

8. The open forging process according to claim 7, characterized in that: The interiors of both sides of the protection frame are threadedly connected with locking screws, and one end of the locking screw abuts against the side surface of the collection frame.

9. A split forging method, characterized in that: The following steps are involved: S1. Select materials; S2. performing a forging operation according to the open forging process of claims 1 to 8; S21, placing the material selected in S1 into a heating furnace, and then heating the heating furnace plate to a temperature of 600°C to 650°C, and keeping it at this temperature for 1 to 2 hours; then heating it to 1050°C to 1250°C at a heating rate of 90°C / h, and keeping it at this temperature for 1 to 2 hours to ensure that the material is evenly heated through; S22. The raw materials heated in S21 are placed in a forging device for forging. The overall forging ratio is 1.8 to 4.

8. The pressing speed of the frustum anvil is 70 mm / s. When the frustum anvil presses down to the maximum, that is, when the pressing rate is 50% to 60%, the pressure is maintained for 5 to 10 minutes to extend the contact time of the upper and lower strain cores. During upsetting, the upper and lower frustum anvils must be preheated to 250°C to 300°C to avoid temperature stress caused by rapid temperature drop in the forging portion where the upper and lower frustum anvils contact. The portion where the upper and lower frustum anvils contact the end face of the forging is covered with glass powder to reduce the friction between the upper and lower contact surfaces, reduce the range of the difficult-to-deform area, and improve the uniform deformation degree of upsetting until the forging is forged into a cuboid. S23. When the frustum anvil upsetting is completed, the cylindrical frustum anvil is removed with a large clamp, and then the narrow flat anvil is installed on the forging equipment. The forging is axially stretched twice. The relative feed amount L / H of the stretching is 0.7-0.8, where L is the feed amount of the upper anvil and H is the height of the rectangular forging. The upper anvil's downward pressure rate is 20%-35%. After one stretching operation, the blank is rotated 90° along the axial direction. Before stretching, the raw material in S22 needs to be heated to 800-900°C, and then the stretching operation is performed. After the first stretching operation, the raw material needs to be heated again to 900-980°C and stretched a second time until it is stretched to the predetermined size. S24, shaping the raw material after the lengthening in S23 into the shape of the required forged product, and then performing final forging through forging equipment to achieve the product with composite requirements; S3. After the final forging is completed, the forgings are subjected to normalizing and low-temperature annealing treatments in sequence. First, the forgings are heated to 800℃~900℃ and kept at this temperature for 10~12 hours. The forgings are then taken out and air-cooled to 250℃~300℃. They are then slowly heated again to 550℃~600℃ and cooled in the furnace. S4. Carry out quality inspection on the cooled forging products, including inspection of dimensional accuracy, surface quality and internal structure.

10. The open forging method according to claim 9, characterized in that: During the quality inspection process, a combination of non-destructive testing and destructive testing is used to ensure that the quality of forged products meets standard requirements.

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