Forging method for improving steel ingot utilization rate of supporting roller and supporting roller

Abstract

The invention provides a forging method for improving the steel ingot utilization rate of a supporting roller and the supporting roller, and relates to the technical field of forge piece forging, the forging method for improving the steel ingot utilization rate of the supporting roller comprises the following steps: forging for a first heating number: after a steel ingot blank is subjected to heat preservation for a first preset time at a first preset temperature, carrying out first overall drawing-out on the steel ingot blank; the steel ingot blank is subjected to heat preservation at a second preset temperature for a second preset duration, then the steel ingot blank is subjected to upsetting through the cooperative use of an upsetting cover plate with a blind hole and a bottoming type upsetting leakage disc, and then the upset steel ingot blank is subjected to second overall drawing-out; and the steel ingot blank is subjected to overall drawing-out and blanking after being subjected to heat preservation at the third preset temperature for a third preset duration. Compared with the prior art, the forging method for improving the utilization rate of the supporting roll steel ingot has the advantages that waste of blanks is reduced in the forging process of the supporting roll forge piece, and the utilization rate of the steel ingot is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of forging of forgings, and in particular, to a forging method for improving the utilization rate of ingots for backup rolls and a backup roll. Background Art

[0002] During the forging process of large-scale hot-rolled and cold-rolled backup roll forgings, the number of heating operations for the ingot clamping jaws takes up the working hours of the press and the manipulator. During the process of drawing out and blanking the billet, due to the concave center at the nozzle end of the billet, it is necessary to increase the forging allowance to ensure the blanking size of the billet at the nozzle end. The clamping jaws at the riser end and the billet of the ingot body are prone to fracture during the blanking process, resulting in waste of many billets, which severely restricts the improvement of the utilization rate of ingots for backup roll forgings. Summary of the Invention

[0003] The problem to be solved by the present invention is: how to reduce the waste of billets during the forging process of backup roll forgings to improve the utilization rate of ingots.

[0004] The present invention provides a forging method for improving the utilization rate of ingots for backup rolls, including:

[0005] The first forging pass: Put the ingot billet into the heating furnace and keep it at a first preset temperature for a first preset time, then use the overhead crane tongs to take out the ingot billet after the first heat preservation, and perform the first overall drawing on the ingot billet after the first heat preservation;

[0006] The second forging pass: Put the ingot billet after the first overall drawing into the heating furnace and keep it at a second preset temperature for a second preset time, then use the overhead crane tongs to take out the ingot billet after the second heat preservation, and use a upsetting cover plate with a blind hole and a bottom-touching upsetting leaky plate in combination to upset the ingot billet after the second heat preservation, and then perform the second overall drawing on the upset ingot billet;

[0007] The third forging pass: Put the ingot billet after the second overall drawing into the heating furnace and keep it at a third preset temperature for a third preset time, then use the overhead crane tongs to take out the ingot billet after the third heat preservation, perform overall drawing and blanking on the ingot billet after the third heat preservation, and finally finish machining the roll body to the forging size according to the forging drawing.

[0008] The forging method for improving the utilization rate of ingots for backup rolls provided by the present invention, compared with the prior art, has but is not limited to the following beneficial effects:

[0009] The forging method for improving the utilization rate of ingots for backup rolls according to the present invention,

[0010] Optionally, the performing the first overall drawing on the ingot billet after the first heat preservation includes:

[0011] Place the ingot blank after the first heat preservation between the first upper anvil and the first lower anvil by using the overhead crane tongs;

[0012] Perform the first overall drawing of the ingot blank placed between the first upper anvil and the first lower anvil through a forging device, and ensure that the drawing ratio is between 1.2 and 1.3.

[0013] Optionally, the upsetting of the ingot blank after the second heat preservation by using the upsetting cover plate with a blind hole and the bottom-touching upsetting leaky plate in cooperation includes:

[0014] Place the bottom-touching upsetting leaky plate on the walking table, and at the same time install the upsetting cover plate with a blind hole on the forging device;

[0015] Place the ingot blank after the second heat preservation vertically into the through-hole structure of the bottom-touching upsetting leaky plate, and make the lower end of the ingot blank abut against the walking table;

[0016] Drive the upsetting cover plate with a blind hole by the forging device to press the ingot blank downwards for multiple times to upset the ingot blank, and ensure that the upsetting ratio is between 2.5 and 3.

[0017] Optionally, the second overall drawing of the upset ingot blank includes:

[0018] Clamp the upset ingot blank by an manipulator, and perform the second overall drawing of the ingot blank by the KD compaction method.

[0019] Optionally, the second overall drawing of the ingot blank by the KD compaction method includes:

[0020] Place the upset ingot blank between the second upper anvil and the second lower anvil, wherein both the second upper anvil and the second lower anvil are V-shaped anvils with an opening of 135° and the same width;

[0021] Perform the second overall drawing of the ingot blank placed between the second upper anvil and the second lower anvil through a forging device.

[0022] Optionally, during the process of the second overall drawing of the ingot blank, ensure that the single pass reduction is greater than 20% of the diameter of the ingot blank.

[0023] Optionally, the overall drawing and blanking of the ingot blank after the third heat preservation includes:

[0024] Place the ingot blank after the third heat preservation between the third upper anvil and the third lower anvil by using the overhead crane tongs;

[0025] Use the manipulator to clamp the riser end of the ingot billet, and draw out the finished product by stretching the nozzle end of the ingot billet;

[0026] Reverse the nozzle end and the riser end of the ingot billet, so that the manipulator clamps the nozzle end of the ingot billet, and draw out the finished product by stretching the riser end of the ingot billet.

[0027] Optionally, the upsetting cover plate with a blind hole includes a cover plate body. A blind hole structure is provided at the center of the end face of the cover plate body for contacting the ingot billet. The blind hole structure is configured to allow the ingot bottom of the nozzle end of the ingot billet to extend into it, and after the ingot billet is upset, the blind hole structure is used to abut against the nozzle end.

[0028] Optionally, the bottom-touching upsetting leak tray includes a leak tray body, which is used to be installed on the walking table. A through-hole structure is axially provided in the leak tray body, and the through-hole structure is configured to allow the riser end of the ingot billet to pass through and abut against the walking table.

[0029] In addition, the present invention also provides a backup roll, which is forged based on the forging method for improving the utilization rate of backup roll ingots as described above.

[0030] Since the technical improvement and the achieved technical effects of the backup roll are the same as those of the forging method for improving the utilization rate of backup roll ingots, the technical effects of the backup roll will not be described in detail herein. Description of the Drawings

[0031] Figure 1 It is a flowchart of the forging method for improving the utilization rate of backup roll ingots according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic structural diagram of the ingot billet before upsetting according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic structural diagram of the ingot billet after upsetting according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic structural diagram of the ingot billet according to an embodiment of the present invention;

[0035] Figure 5 It is a cross-sectional view of the upsetting cover plate with a blind hole according to an embodiment of the present invention;

[0036] Figure 6 It is a cross-sectional view of the bottom-touching upsetting leak tray according to an embodiment of the present invention.

[0037] Description of the Reference Numerals:

[0038] 1. Ingot blank; 11. Nozzle end; 12. Riser end; 2. Upsetting cover plate with blind hole; 21. Cover plate body; 22. Blind hole structure; 3. Bottom-touching upsetting drain pan; 31. Drain pan body; 32. Through hole structure; 4. Platform. Detailed implementation manners

[0039] To make the above objects, features and advantages of the present invention more obvious and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0040] In the description of the present invention, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "top", "bottom", "front", "rear", "inner" and "outer" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the protection scope of the present invention.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment" and "one implementation manner" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or implementation manner are included in at least one embodiment or implementation manner of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or implementation manner. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementation manners in a suitable manner.

[0043] Moreover, in the accompanying drawings, the Z-axis represents the vertical direction, that is, the up and down positions, and the positive direction of the Z-axis (that is, the arrow direction of the Z-axis) represents up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents down.

[0044] At the same time, it should be noted that the above meaning represented by the Z-axis is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention.

[0045] Such as Figures 1 to 4As shown in the figure, the forging method for improving the utilization rate of ingots of the support roll of the present invention embodiment includes:

[0046] Step S1, the first forging pass: Put the ingot blank 1 into the heating furnace, after heat preservation at the first preset temperature for the first preset duration, use the overhead crane tongs to take out the ingot blank 1 after the first heat preservation, and perform the first overall drawing out on the ingot blank 1 after the first heat preservation;

[0047] Step S2, the second forging pass: Put the ingot blank 1 after the first overall drawing out into the heating furnace, after heat preservation at the second preset temperature for the second preset duration, use the overhead crane tongs to take out the ingot blank 1 after the second heat preservation, and cooperate with the upsetting cover plate 2 with blind holes and the bottom-touching upsetting leakage plate 3 to perform upsetting on the ingot blank 1 after the second heat preservation, and then perform the second overall drawing out on the upset ingot blank 1;

[0048] Step S3, the third forging pass: Put the ingot blank 1 after the second overall drawing out into the heating furnace, after heat preservation at the third preset temperature for the third preset duration, use the overhead crane tongs to take out the ingot blank 1 after the third heat preservation, perform overall drawing out and blanking on the ingot blank 1 after the third heat preservation, and finally finish machining the roll body to the forging size according to the forging drawing.

[0049] In this embodiment, in combination with Appendix Figure 1 to Appendix Figure 4 As shown, in the first forging pass, the ingot blank 1 is put into the heating furnace, and after heat preservation at 1250 °C for several hours (it can be heat-preserved for 50 minutes according to the 100 mm cross-section of the ingot), use the overhead crane tongs to take out the ingot blank 1 after the first heat preservation, and then perform the first overall drawing out on the ingot blank 1 after the first heat preservation. At this time, the ingot blank 1 has not been cut off the nozzle waste (the ingot does not need to be pre-gas cut at the nozzle bottom of the ingot, reducing the gas cutting cost and improving cost and efficiency), and the ingot riser has not been forged into a tong mouth (the diameter of the tong mouth is small, and pressing the tong mouth will increase the working hours of the press and the manipulator). After drawing out, the ingot blank 1 is returned to the heating furnace. In the second forging pass, the ingot blank 1 is in the heating furnace, and after heat preservation at 1250 °C for several hours, use the overhead crane tongs to take out the ingot blank 1 after the second heat preservation. Design a special upsetting cover plate 2 with blind holes, and the size of the blind holes can be designed according to the size of the nozzle bottom of the ingot. For example, the depth is 100 mm deeper than the nozzle bottom of the ingot. Without increasing the number of forging passes, cooperate with the bottom-touching upsetting leakage plate 3 to perform upsetting on the ingot blank 1, that is, the bottom-touching upsetting leakage plate 3 can be installed on the walking platform 4, and at the same time the upsetting cover plate 2 with blind holes is installed on the forging equipment. At this time, the riser end of the ingot blank 1 contacts the walking platform 4 (equivalent to the ground), as shown in Appendix Figure 2 and Appendix Figure 3As shown, through the backward extrusion of the ingot blank 1, the blind hole part of the upsetting cover plate 2 with a blind hole is filled with the blank, so that the nozzle end of the ingot blank 1 bulges and does not sink. The application of the bottom-touching upsetting leakage plate 3 can prevent the ingot blank 1 from causing material jamming during the upsetting process (if a traditional upsetting leakage plate is used, there is a gap between the ingot riser end and the walking platform, and the ingot will move downward during the upsetting process), ensuring the upsetting effect of the blank, improving the utilization rate of the ingot for the backup roll. After the ingot blank is upset, the ingot blank 1 is subjected to the second overall drawing out. In the third forging heat, the ingot blank 1 is placed in a heating furnace and can be kept at a high temperature of 1250 °C for several hours. Then, the ingot blank 1 after the third heat preservation is taken out by a crane tong, and then the ingot blank 1 after the third heat preservation is subjected to overall drawing out and blanking by forging equipment (forging a finished product in the shape of a stepped shaft). Finally, according to the forging drawing, the roll body is finished to the forging size. The forging method for improving the utilization rate of the ingot for the backup roll of the present invention, compared with the related technology, by designing and using the upsetting cover plate 2 with a blind hole and the bottom-touching upsetting leakage plate 3, during the upsetting forging heat process of the blank, the blank can be directly upset. Since the riser end of the blank directly touches the bottom (the walking platform 4), it ensures the upsetting effect of the blank and fully eliminates the defects at the bottom of the nozzle of the ingot. In the subsequent process of drawing out and blanking the finished product of the backup roll, the end face of the nozzle end does not sink, the diameter drop between the riser end blank of the ingot and the jaw is small, and large-area folding damage of the blank is avoided during the drawing out and blanking process, making full use of the blank, reducing the waste of the blank, and improving the utilization rate of the ingot.

[0050] Optionally, the first overall drawing out of the ingot blank 1 after the first heat preservation includes:

[0051] Placing the ingot blank 1 after the first heat preservation between the first upper anvil and the first lower anvil by using the crane tong;

[0052] Performing the first overall drawing out of the ingot blank 1 placed between the first upper anvil and the first lower anvil by forging equipment, and ensuring that the drawing ratio is between 1.2 and 1.3.

[0053] In this embodiment, after the ingot blank 1 is subjected to the first heat preservation, the ingot blank 1 is taken out by a crane tong, and the first upper anvil and the first lower anvil are used to perform overall drawing (compacting the original as-cast morphology of the blank) on the ingot blank 1, and it is ensured that the drawing ratio (the ratio of the total length of the blank after drawing to the total length of the original blank) is between 1.2 and 1.3, which can improve the as-cast structure of the original blank while avoiding material loss caused by excessive deformation. The first upper anvil can be an upper flat anvil with a width of 600 mm, the first lower anvil can be a V-shaped anvil with a width of 600 mm, or the first upper anvil and the first lower anvil can be the same flat anvils with widths of 600 mm, 700 mm, and 850 mm. During the first overall drawing process, the ingot blank 1 is transferred between the first upper anvil and the first lower anvil by a crane tong after being heated and heat-preserved, and the forging equipment applies pressure to make the blank extend axially. The selection of the drawing ratio range is based on the initial size of the blank and the forging target. For example, for a steel ingot blank with a larger diameter, uniform deformation can be achieved through staged reduction operations. During the forging process, the planar contact surfaces of the upper and lower anvils (the first upper anvil and the first lower anvil) can ensure uniform stress on the blank, thereby reducing the generation of surface scratches and internal cracks.

[0054] Optionally, the upsetting of the ingot blank 1 after the second heat preservation by using the upsetting cover plate 2 with blind holes and the bottom-touching upsetting leaky plate 3 in cooperation includes:

[0055] Place the bottom-touching upsetting leaky plate 3 on the walking platform 4, and at the same time install the upsetting cover plate 2 with blind holes on the forging equipment;

[0056] Place the ingot blank 1 after the second heat preservation vertically into the through-hole structure 32 of the bottom-touching upsetting leaky plate 3, and make the lower end of the ingot blank 1 abut against the walking platform 4;

[0057] Drive the upsetting cover plate 2 with blind holes by the forging equipment to press down the ingot blank 1 multiple times to upset the ingot blank 1, and ensure that the upsetting ratio is between 2.5 and 3.

[0058] In this embodiment, as shown in Attachment Figure 2 to Attachment Figure 6 During the upsetting process of the second heat treatment in forging, first place the bottom-touching upsetting leaky plate 3 on the walking platform 4 (equivalent to the ground), and at the same time install the upsetting cover plate 2 with blind holes on the forging equipment (such as a hydraulic press). Then place the ingot blank 1 after the second heat preservation vertically (in the Z-axis direction in Attachment Figure 2 or Attachment Figure 3 ) into the through-hole structure 32 of the bottom-touching upsetting leaky plate 3, and make the lower end (the riser end 12) of the ingot blank 1 abut against the walking platform 4. Then drive the upsetting cover plate 2 with blind holes by the forging equipment to press down the ingot blank 1 multiple times to upset the ingot blank 1 (Attachment Figure 3as shown in the figure), and ensure that the upsetting ratio is between 2.5 and 3, so that the bottom of the nozzle end of the ingot fully fits the blind hole structure 22 of the upsetting cover plate 2 with a blind hole. Without increasing the number of forging heats, the cost of gas cutting the nozzle bottom of the ingot is reduced, which not only ensures the upsetting and compaction effect of the billet, but also achieves the purpose of cost reduction and efficiency improvement.

[0059] Optionally, the second overall drawing out of the upset steel ingot billet 1 includes:

[0060] Clamp the upset steel ingot billet 1 by an manipulator, and perform the second overall drawing out of the steel ingot billet 1 by means of KD compaction.

[0061] Optionally, the second overall drawing out of the steel ingot billet 1 by means of KD compaction includes:

[0062] Place the upset steel ingot billet 1 between a second upper anvil and a second lower anvil, wherein both the second upper anvil and the second lower anvil are V-shaped anvils with an opening of 135° and the same width;

[0063] Perform the second overall drawing out of the steel ingot billet 1 placed between the second upper anvil and the second lower anvil by a forging device.

[0064] In this embodiment, the KD compaction means compressing and deforming the billet by an anvil with a specific shape. Specifically, it can be realized by using V-shaped anvils with an opening of 135° and the same width. Uniform pressure is applied through the symmetrical V-shaped anvil surfaces to promote the closure of internal pores in the billet and improve the tissue compactness. Specifically, after upsetting is completed, the manipulator clamps the riser end 12 of the steel ingot billet 1 and transfers it between the anvils (the second upper anvil and the second lower anvil) of the forging device. Subsequently, V-shaped anvils are used as the second upper anvil and the second lower anvil, and the billet is continuously pressed down by the forging device. During this process, the inclined surfaces of the V-shaped anvils contact the outer surface of the billet, applying a combined radial and axial stress to eliminate internal defects while the billet extends axially. By controlling the single pass reduction amount, for example, it can be set to more than 20% of the diameter of the billet, the deformation uniformity is further improved to avoid folding or cracking caused by local stress concentration. Both the second upper anvil and the second lower anvil are V-shaped anvils with an opening of 135° and the same width, and the width is generally between 1200 mm and 1500 mm.

[0065] Optionally, during the second overall drawing out of the steel ingot billet 1, ensure that the single pass reduction amount is greater than 20% of the diameter of the steel ingot billet 1 (the upset steel ingot billet).

[0066] In this embodiment, the single-pass reduction refers to the amount of compression applied to the blank by the forging equipment in a single downward pressing action, which can be specifically achieved by adjusting the stroke of the hydraulic press plunger or controlling the distance between the anvils. This helps to fully break up the loose structure inside the blank during a single deformation. Among them, 20% of the diameter refers to the value of 1 / 5 of the maximum outer diameter of the cross-section of the blank. For example, for a blank with a diameter of 1000 mm, the single-pass reduction needs to exceed 200 mm, which can ensure a sufficient deformation penetration depth to avoid uneven deformation between the surface and the core. Specifically, when using a V-shaped anvil to clamp the blank during the second overall drawing stage, the forging equipment performs continuous forging with a single-pass reduction exceeding 20% of the blank diameter. This reduction forces the blank metal to have sufficient radial flow while extending axially, thereby effectively eliminating the internal voids that may form during the upsetting process. By controlling the single deformation amount above this threshold, the grain boundary slip damage caused by the accumulation of small reductions in multiple passes can be reduced, and further, the risk of cracking at the riser end and the nozzle end during the subsequent drawing and blanking process can be lowered.

[0067] Optionally, the overall drawing and blanking of the ingot blank 1 after the third heat preservation includes:

[0068] Using the overhead crane tongs to place the ingot blank 1 after the third heat preservation between the third upper anvil and the third lower anvil;

[0069] Using the manipulator to clamp the riser end 12 of the ingot blank 1 and perform drawing and blanking on the nozzle end 11 of the ingot blank 1 to obtain a finished product;

[0070] Reverse the directions of the nozzle end 11 and the riser end 12 of the ingot blank 1, so that the manipulator clamps the nozzle end 11 of the ingot blank 1 and performs drawing and blanking on the riser end 12 of the ingot blank 1 to obtain a finished product.

[0071] In this embodiment, the third upper anvil and the third lower anvil refer to forging tools for fixing the position of the billet. Specifically, the third upper anvil can be an upper flat anvil with a width of 600 mm, and the third lower anvil can be a V-shaped anvil with a width of 600 mm. The force balance of the billet during the drawing process can be stabilized through the cooperation of the upper and lower anvils. The manipulator clamping means fixing and moving the billet by using a robotic arm, which can be specifically implemented by a hydraulically driven clamping device. By precisely controlling the clamping force, the billet can be prevented from shifting or slipping during the drawing process. Reversing the direction means swapping the positions of the two ends of the billet, which can be specifically achieved through the coordinated operation of the overhead crane and the manipulator. By alternately processing the two ends, uniform deformation of the entire billet can be ensured. Specifically, in the third heat treatment, after the billet is transferred by the overhead crane tongs and fixed between the third upper anvil and the third lower anvil, the manipulator first clamps the riser end 12, and performs drawing and blanking on the tundish end 11 to obtain the finished product. At this time, the tundish end 11 of the billet (ingot billet 1) is gradually extended to the target size. Subsequently, the billet is flipped 180 degrees, and the manipulator changes to clamp the tundish end 11, and performs drawing and blanking on the riser end 12 with the same process to obtain the finished product.

[0072] Optionally, the upsetting cover plate 2 with a blind hole includes a cover plate body 21. A blind hole structure 22 is provided at the center position of the end face of the cover plate body 21 for contacting the ingot billet 1. The blind hole structure 22 is configured to allow the ingot bottom of the tundish end 11 of the ingot billet 1 to extend therein, and after the ingot billet 1 is upset, the blind hole structure 22 is used to abut against the tundish end 11.

[0073] In this embodiment, the blind hole structure 22 refers to a concave cavity provided at the center position of the contact surface of the cover plate body 21, which can be specifically implemented by a cylindrical cavity structure. This structure can form an axial limit on the billet after the tundish end 11 is pressed in, and avoid non-uniform flow of the end face material of the ingot billet 1 during the upsetting process. Among them, the cover plate body 21 refers to a metal matrix carrying the blind hole structure 22, which can be specifically forged from high-strength alloy steel. The diameter of its contact surface can be more than 1.5 times the diameter of the ingot billet, thereby providing a sufficient support area during upsetting.

[0074] Specifically, in the upsetting process of the ingot billet 1, the tundish end 11 is guided to insert into the blind hole structure 22, and a contact constraint is formed between the inner wall of the blind hole structure 22 and the outer surface of the tundish end 11. When the upsetting pressure is applied, the tundish end 11 generates a counter-extrusion in the blind hole structure 22, filling the blind hole structure 22 part into the billet, making the ingot tundish end bulge and not concave. The blind hole depth is beneficial to the axial movement of the billet at the core of the tundish end, and is beneficial to the extrusion of the deposited pollution and oxide inclusions at the bottom of the ingot tundish end. At the same time, the contact area of the cover plate body 21 covers most of the area of the ingot end face, effectively preventing creases from being generated at the end face edge due to local stress.

[0075] Compared with the prior art, the conventional upsetting cover plate is a planar structure. During upsetting, the free deformation of the nozzle end of the steel ingot leads to an increase in the depth of the concave center, and additional material needs to be removed. However, this solution actively constrains the deformation path of the nozzle end through the blind hole structure 22, so that the material flow direction can be controlled and the end surface flatness is improved.

[0076] Optionally, the bottom-touching upsetting drain disc 3 includes a drain disc body 31, and the drain disc body 31 is used to be installed on the walkway 4. The drain disc body 31 is provided with a through hole structure 32 along its axial direction, and the through hole structure 32 is configured to allow the riser end 12 of the steel ingot billet 1 to pass through and abut against the walkway 4.

[0077] In this embodiment, during the upsetting process, the drain plate body 31 is installed on the walkway 4, and the riser end 12 of the steel ingot blank 1 is inserted into the through-hole structure 32 and contacts the walkway 4 to form a bottom support. The forging equipment drives the upsetting cover plate 2 with a blind hole to press down the steel ingot blank 1 for many times, and the riser end 12 remains axially fixed in the through-hole structure 32 to prevent the blank from shifting or tilting during the upsetting process. The cooperation between the through-hole structure 32 and the riser end 12 limits the radial deformation range of the blank, and at the same time, the contact surface between the walkway 4 and the riser end 12 provides a reaction force to ensure that the upsetting force is evenly transmitted to the entire blank. Compared with the prior art, the traditional upsetting drain plate only provides a simple supporting function, and the riser end 12 is not in direct contact with the walkway 4. During upsetting, the blank is easy to move down, resulting in the billet being strangled. In this solution, the through hole structure 21 cooperates axially with the riser end 12 , so that the riser end 12 always maintains contact with the walkway 4 during the upsetting process, effectively preventing the blank from deforming out of control, and simplifying the positioning operation of the riser end 12 .

[0078] In addition, the present invention also provides a support roller, which is forged based on the forging method for improving the utilization rate of the support roller steel ingot as described above.

[0079] Since the technical improvement and technical effect of the support roller are the same as the forging method for improving the utilization rate of the support roller ingot, the technical effect of the support roller will not be described in detail.

[0080] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0081] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A forging method for improving the utilization rate of backup roll ingots, characterized in that, include: Forging the first time: placing the steel ingot (1) into a heating furnace and keeping it at a first preset temperature for a first preset time, taking out the steel ingot (1) after the first time of keeping it warm by using a crane clamp, and performing a first overall drawing on the steel ingot (1) after the first time of keeping it warm; Forging the second time: after the first overall drawing, the steel ingot (1) is placed in the heating furnace and kept at a second preset temperature for a second preset time, the steel ingot (1) after the second insulation is taken out by the overhead crane clamp, and the steel ingot (1) after the second insulation is upset by using an upsetting cover plate (2) with a blind hole and a bottom-touching upsetting drain plate (3), and then the steel ingot (1) after the upsetting is overall drawn for the second time; Forging the third time: after the second overall drawing, the steel ingot billet (1) is placed in the heating furnace and kept at a third preset temperature for a third preset time, the steel ingot billet (1) after the third insulation is taken out by the overhead crane clamp, and the steel ingot billet (1) after the third insulation is overall drawn and cut, and finally the roller body is smoothed to the forging size according to the forging drawing.

2. The forging method for improving the ingot utilization rate of the lifting support roll according to claim 1, characterized in that, The first overall stretching of the steel ingot billet (1) after the first heat preservation comprises: The steel ingot (1) after the first heat preservation is placed between a first upper anvil and a first lower anvil by using the overhead crane clamp; The steel ingot blank (1) placed between the first upper anvil and the first lower anvil is subjected to a first overall drawing by a forging device, and the drawing ratio is ensured to be between 1.2 and 1.

3.

3. The forging method for improving the utilization rate of ingots of the lifting support rolls according to claim 1, characterized in that, The method of using the upsetting cover plate (2) with a blind hole and the bottom-touching upsetting drain plate (3) in combination to upset the steel ingot billet (1) after the second heat preservation comprises: The bottom-touching upsetting drain plate (3) is placed on a walking platform (4), and the upsetting cover plate (2) with a blind hole is installed on a forging device; Putting the steel ingot (1) after the second heat preservation into the through hole structure (32) of the bottom-touching upsetting drain plate (3) in a vertical direction, and making the lower end of the steel ingot (1) abut against the walkway (4); The forging equipment drives the upsetting cover plate (2) with the blind hole to press down the steel ingot blank (1) for many times, so as to upset the steel ingot blank (1) and ensure that the upsetting ratio is between 2.5 and 3.

4. The forging method for improving the utilization rate of ingots of the lifting support rolls according to claim 1, characterized in that, The second overall stretching of the steel ingot billet (1) after upsetting comprises: The steel ingot billet (1) after upsetting is clamped by a manipulator, and the steel ingot billet (1) is stretched as a whole for a second time by a KD compaction method.

5. The forging method for improving the ingot utilization rate of the lifting support roll according to claim 4, characterized in that, The KD compaction method includes: Placing the steel ingot (1) after upsetting between a second upper anvil and a second lower anvil, wherein the second upper anvil and the second lower anvil are both V-shaped anvils with an opening of 135° and the same width; The steel ingot blank (1) placed between the second upper anvil and the second lower anvil is subjected to a second overall drawing by a forging device.

6. The forging method for improving the utilization rate of ingots of the lifting support roll according to claim 5, characterized in that, During the second overall drawing of the ingot blank (1), ensure that the single reduction amount is greater than 20% of the diameter of the ingot blank (1).

7. The forging method for improving the ingot utilization rate of the lifting support roll according to claim 1, wherein, The overall drawing and blanking of the ingot blank (1) after the third heat preservation includes: Use the overhead crane tongs to place the ingot blank (1) after the third heat preservation between the third upper anvil and the third lower anvil; Use the manipulator to clamp the riser end (12) of the ingot blank (1), and perform drawing and blanking on the tundish end (11) of the ingot blank (1) to obtain the finished product; Reverse the directions of the tundish end (11) and the riser end (12) of the ingot blank (1), so that the manipulator clamps the tundish end (11) of the ingot blank (1), and perform drawing and blanking on the riser end (12) of the ingot blank (1) to obtain the finished product.

8. The forging method for improving the utilization rate of ingots of the lifting support roll according to claim 1, characterized in that, The upsetting cover plate (2) with a blind hole includes a cover plate body (21). A blind hole structure (22) is provided at the center position of the end face of the cover plate body (21) for contacting the ingot blank (1). The blind hole structure (22) is configured to allow the ingot bottom of the tundish end (11) of the ingot blank (1) to extend in. After the ingot blank (1) is upset, the blind hole structure (22) is used to abut against the tundish end (11).

9. The forging method for improving the utilization rate of ingots of the lifting support roll according to claim 1, wherein, The bottom-touching upsetting drain pan (3) includes a drain pan body (31). The drain pan body (31) is used to be installed on the walking platform (4). The drain pan body (31) is axially provided with a through-hole structure (32). The through-hole structure (32) is configured to allow the riser end (12) of the ingot blank (1) to pass through and abut against the walking platform (4).

10. A backup roll, characterized in that, Forged based on the forging method for improving the ingot utilization rate of the lifting support roll according to any one of claims 1 to 9.

Images