Forging method for asymmetric compaction of center of supporting roll

Abstract

The invention provides a forging method for asymmetric compaction of the center of a supporting roller, and relates to the technical field of forging machining.The forging method for asymmetric compaction of the center of the supporting roller comprises the steps of jaw pressing, flat square pre-drawing, upsetting, drawing-out, octagonal blank chamfering and rounding, drawing-out and blanking to obtain a finished product. In the jaw pressing heating number, anvil distribution and full anvil feeding are conducted from the riser end to the water gap end, the blank is turned over by 180 degrees after one pass of pressing is completed, the blank is rotated by 90 degrees after being pressed to the process size, only three faces are pressed, and a flat square blank is obtained; in the upsetting and drawing-out heating number, after the steel ingot blank is upset, the surface of the side with the small area is pressed for the first pass, and the rolling reduction is 25% of the height of the blank; the blank is rotated by 90 degrees, the second pass is pressed, the operation is repeated, and it is guaranteed that the rolling reduction of the odd pass is larger than that of the even pass; and the blank is compacted by adopting asymmetric rolling reduction, so that the core defect of the blank can be fully welded, a more compact organization structure is obtained, and the flaw detection qualification rate of a supporting roller product is increased.

Description

Technical Field

[0001] The invention relates to the technical field of forging processing, and in particular to a forging method for asymmetrically compacting a core portion of a support roller. Background Art

[0002] Cold-rolled and hot-rolled support rollers are mostly forged on free forging hydraulic presses or oil presses. During the forging process, the steel ingot billet is first pressed into the jaws and then upset and stretched once, resulting in the existence of internal defects in the support roller forgings after upsetting and compaction. The flaw detection effect of the support roller forgings is poor and the scrap rate is high. Many support roller forgings increase the number of upsetting, drawing and compaction fires to improve the core flaw detection pass rate of the support roller forgings, resulting in excessively high forging costs. Summary of the invention

[0003] The problem solved by the invention is how to solve the problem of poor flaw detection effect of support roller forgings and high forging cost caused by increasing the number of upsetting, drawing, and compacting fires to improve the flaw detection pass rate of the core of the support roller forging products.

[0004] In order to solve the above problems, the present invention provides a forging method for asymmetrically compacting the core of a support roller.

[0005] The present invention provides a forging method for asymmetrically compacting the core of a support roller, comprising the following steps:

[0006] S1, pre-drawn flat square forging: in the first forging process, the upper and lower flat anvils are used to pre-draw the steel ingot blank, the anvils are arranged from the riser end to the nozzle end, the full anvil is fed, and after the first pass of the first forging process, the steel ingot blank is rotated 180 degrees based on the axis as the reference, and the second pass of the first forging process is pressed. The steel ingot blank is rotated 90 degrees based on the axis as the reference, and the third pass of the first forging process is pressed to obtain a flat square blank with an aspect ratio of 1.42-1.55;

[0007] S2, upsetting and drawing forging: the second upsetting and drawing forging fire, after the steel ingot billet is upset, the upsetting ratio is controlled according to 2.15-2.4, the flat square billet is drawn and compacted by upper and lower flat anvils, the first pass of the second forging fire is pressed on a pair of surfaces with a smaller area of ​​the flat square billet, the flat square billet is rotated 90 degrees with the axis as the reference, and the second pass of the second forging fire is pressed, and the above operation is repeated, and eight passes of the second forging fire are pressed to ensure that the pressing amount of the odd-numbered passes of the second forging fire is greater than the pressing amount of the even-numbered passes; the flat square billet is chamfered and rounded;

[0008] S3, forging finished products: The third fire is drawing and cutting to produce finished products. An 850-wide upper flat and lower V-shaped anvil is used to draw the large circle of the roller body of the long round blank, and then the blank is drawn and cut in turn to obtain the finished support roller.

[0009] Optionally, the width of the upper and lower flat anvils in step S1 is the same as the width of the upper and lower flat anvils in step S2.

[0010] Optionally, the width of the upper flat and lower V-anvil in step S3 is smaller than the width of the upper and lower flat anvils in step S2.

[0011] Optionally, the reduction amount of the first pass of the first forging fire in step S1 is 20% of the height of the steel ingot blank.

[0012] Optionally, in step S1, the relative feed rate of the second pass of the first forging pass is 0.8-1.2.

[0013] Optionally, after the third pass of the first forging process in step S1 is completed, rotation forging is no longer performed.

[0014] Optionally, in step S2, the reduction amount of the first pass of the second forging fire is 25% of the height of the flat square billet, and the reduction amount of the second pass of the second forging fire is 20% of the height of the flat square billet.

[0015] Optionally, step S2 specifically includes upsetting the steel ingot billet, and the upsetting ratio is controlled as 2.15-2.4. The first pass of the second forging fire is pressed on a pair of surfaces with smaller area of ​​the flat square billet, and the pressing amount is 25% of the height of the flat square billet. The flat square billet is rotated 90 degrees with the axis as the reference, and the second pass of the second forging fire is pressed, and the pressing amount is 20% of the height of the flat square billet. The above operation is repeated, and the second forging fire is pressed for eight passes to ensure that the pressing amount of the odd-numbered passes of the second forging fire is greater than the pressing amount of the even-numbered passes. After the flat square billet is chamfered, it is rounded.

[0016] Optionally, the reduction in odd-numbered passes is 25% of the height of the flat square billet.

[0017] Optionally, the reduction in even-numbered passes is 20% of the height of the flat square billet.

[0018] The beneficial effect of the forging method of the asymmetric compaction of the core of the support roller of the present invention is as follows: in the first fire pressure jaw forging fire, a pre-drawing flat square forging process of the steel ingot billet is added, the anvil is arranged from the riser end to the nozzle end, the full anvil is fed, the first pressing amount is 20% of the billet, and the billet is turned 180 degrees after the first pass of the first forging fire, and after the length is pressed to the size, the billet is rotated 90 degrees to regularize the width. After the regularization, the billet is no longer rotated, and only three faces are pressed to obtain a flat square billet with an aspect ratio of 1.42-1.55, and the internal defects of the billet are reconstructed. In this process, no forging fire is added; in the second fire upsetting and drawing forging fire, after the steel ingot billet is upset, it is turned to The first pass of the second forging fire is pressed on the surface of the smaller area, and the pressing amount is 25% of the billet height; the billet is rotated 90 degrees with the axis as the reference, and the second pass of the second forging fire is pressed, and the pressing amount is 20% of the billet height, the pressing amount of the first pass of the second forging fire is greater than the pressing amount of the second pass of the second forging fire, and the above operation is repeated. After eight passes of the second forging fire are pressed, it is ensured that the pressing amount of the odd-numbered passes of the second forging fire is greater than the pressing amount of the even-numbered passes; the billet is compacted by an asymmetric pressing amount, which ensures that the core defects of the billet can be fully welded, a denser organizational structure is obtained, and the flaw detection pass rate of the supporting roller products is increased. A pre-drawing forging process is added to obtain a flat square billet. After the flat square billet is upset, it is asymmetrically drawn and compacted to ensure the compaction effect of the center of the support roller. The obtained support roller product meets the flaw detection standard and improves the flaw detection pass rate of the support roller. On the basis of not increasing the original forging times and the forging cost, the flaw detection pass rate of the support roller forgings is improved, which meets the national standard GB / T4120-2006. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of using upper and lower flat anvils to pre-draw a support roller blank in step S1 of the forging method for asymmetrically compacting the center of the support roller of this embodiment;

[0020] Figure 2 Schematic diagram of the cross-sectional structure of the support roller blank in step S1 of the forging method for asymmetrically compacting the center of the support roller of this embodiment;

[0021] Figure 3 It is a schematic structural diagram of the use of upper and lower flat anvils to stretch and compact a rectangular cross-section flat square billet in step S2 of the forging method for asymmetric compaction of the center portion of the support roller of this embodiment. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application;

[0024] The term "including" and its variations used in this article are open inclusions, that is, "including but not limited to"; the term "based on" is "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first" and "second" mentioned in the present invention are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more.

[0025] In the related technology, cold-rolled and hot-rolled support rollers are mostly forged on free forging hydraulic presses or oil presses. Since the related equipment does not have a suitable forging method, many support roller forging products increase the number of upsetting, drawing, and compacting fires to improve the core flaw detection pass rate of support roller forging products.

[0026] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a forging method for asymmetric compaction of the core of a support roller.

[0027] A forging method for asymmetrically compacting the core of a support roller provided in an embodiment of the present invention comprises the following steps:

[0028] S1, pre-drawn flat square forging: in the first forging process, the upper and lower flat anvils are used to pre-draw the steel ingot blank, the anvils are arranged from the riser end to the nozzle end, the full anvil is fed, and after the first pass of the first forging process, the steel ingot blank is rotated 180 degrees based on the axis as the reference, and the second pass of the first forging process is pressed. The steel ingot blank is rotated 90 degrees based on the axis as the reference, and the third pass of the first forging process is pressed to obtain a flat square blank with an aspect ratio of 1.42-1.55;

[0029] For example, Figure 1 and Figure 2 As shown, during forging, the upper and lower flat anvils with a width of 1500mm contact the surfaces of the steel ingot billet, namely the A surface, B surface, C surface and D surface. First, the upper and lower flat anvils are used to pre-pull the steel ingot billet, press the first forging fire and the first pass, forge the C surface and the D surface, so that the distance between the C surface and the D surface is shortened, the billet becomes flat, and the steel ingot billet is centered on the axis (i.e. Figure 2 The billet is rotated 180 degrees with the axis as the reference, and the second pass of the first forging is pressed. The C surface and the D surface are forged again to further shorten the distance between the C surface and the D surface. The billet is rotated 90 degrees to the left or right with the axis as the reference, and the third pass of the first forging is pressed to press the A surface and the B surface to shorten the distance between the A surface and the B surface. The width of the steel ingot billet is regularized to obtain a flat square billet with an aspect ratio of 1.42-1.55, such as Figure 1 As shown, the aspect ratio is L:W. At this time, the steel ingot is flattened, the surface areas of the A and B surfaces are relatively reduced, and the surface areas of the C and D surfaces are relatively increased;

[0030] S2, upsetting and drawing forging: the second upsetting and drawing forging fire, after the steel ingot billet is upset, the upsetting ratio is controlled according to 2.15-2.4, the flat square billet is drawn and compacted by upper and lower flat anvils, the first pass of the second forging fire is pressed on a pair of surfaces with a smaller area of ​​the flat square billet, the flat square billet is rotated 90 degrees with the axis as the reference, and the second pass of the second forging fire is pressed, and the above operation is repeated, and eight passes of the second forging fire are pressed to ensure that the pressing amount of the odd-numbered passes of the second forging fire is greater than the pressing amount of the even-numbered passes; the flat square billet is chamfered and rounded;

[0031] For example, in the second forging process, after the steel ingot is upset, the flat square billet is stretched and compacted by using 1500mm wide upper and lower flat anvils, and the first pass of the second forging process is pressed against a pair of roller surfaces with a smaller area, that is, Figure 3As shown, the first pass of the second forging fire is pressed toward the A surface and the B surface to lengthen the height H of the flat square billet. The billet is rotated 90 degrees to the left or right with the axis as the reference, and the second pass of the second forging fire is pressed, that is, the second pass of the second forging fire is pressed toward the C surface and the D surface. The pressing amount of the first pass of the second forging fire is 25% of the billet length (L), and the pressing amount of the second pass of the second forging fire is 20% of the billet width (W). The above operation is repeated, and eight passes of the second forging fire are pressed to ensure that the pressing amount of the odd-numbered passes of the second forging fire is always greater than the pressing amount of the even-numbered passes; specifically, as Figure 3 As shown, the first, third, fifth and seventh passes of the second forging process are pressed on the pair of smaller roller surfaces, namely, the A surface and the B surface, and the second, fourth, sixth and eighth passes of the second forging process are pressed on the pair of larger roller surfaces, namely, the C surface and the D surface, so as to weld and compact the internal defects again;

[0032] S3, forging finished products: The third fire is drawing and cutting to produce finished products. An 850-wide upper flat and lower V-shaped anvil is used to draw the large circle of the roller body of the long round blank, and then the blank is drawn and cut in turn to obtain the finished support roller.

[0033] In this embodiment, in the first fire pressure jaw forging fire, the pre-drawn flat square billet is forged, and only three passes are pressed, in which the C surface and the D surface are pressed twice, and the A surface and the B surface are pressed once, and the obtained flat square billet with an aspect ratio of 1.42-1.55 is reconstructed to reconstruct the internal defects of the billet; in the second fire upsetting and drawing forging fire, after the steel ingot billet is upset, the upsetting ratio is controlled according to 2.15-2.4, and the first pass of the second forging fire is pressed on a pair of surfaces with a smaller area of ​​the roller surface, namely the A surface and the B surface, and the billet is based on the axis. Rotate 90 degrees, press the second pass of the second forging fire, the first pass of the second forging fire is 25% of the billet length (L), the second pass of the second forging fire is 20% of the billet width (W), repeat the above operation, press eight times, ensure that the odd pass of the second forging fire is always greater than the even pass; use asymmetric pressing to compact the billet, ensure that the core defects of the billet can be fully welded, obtain a denser structure, and increase the qualified rate of flaw detection of the support roller product. Add the process of pre-drawn flat square forging to obtain the flat square billet, and perform asymmetric drawing and compaction to ensure the compaction effect of the core of the support roller. The obtained support roller product has good flaw detection effect, which improves the qualified rate of flaw detection of the support roller. On the basis of not increasing the original forging times, the forging cost is not increased, and the flaw detection effect is improved, which meets the national standard GB / T4120-2006.

[0034] Among them, the diameter of the riser end of the steel ingot billet is large, and the diameter of the nozzle end is small.

[0035] Optionally, the width of the upper and lower flat anvils in step S1 is the same as the width of the upper and lower flat anvils in step S2.

[0036] Specifically, the width of the upper and lower flat anvils may be 1500 mm, 1200 mm or 850 mm.

[0037] Optionally, the width of the upper flat and lower V-anvil in step S3 is smaller than the width of the upper and lower flat anvils in step S2.

[0038] Specifically, the width of the upper flat and lower V-anvil can be 850mm or 600mm.

[0039] Optionally, the reduction amount of the first pass of the first forging fire in step S1 is 20% of the height of the steel ingot blank.

[0040] Specifically, in the first pass of pressing, the anvils are arranged from the riser end to the nozzle end, and the anvils are fully fed.

[0041] Optionally, in step S1, the relative feed rate of the second pass of the first forging pass is 0.8-1.2.

[0042] Specifically, the full anvil is fed, the first forging fire is pressed down in the second pass, and the relative feed amount is 0.8-1.2 to ensure uniform deformation of the steel ingot billet and avoid breakage of the steel ingot billet.

[0043] Optionally, the reduction amount of the third pass of the first forging fire in step S1 is not restricted.

[0044] Specifically, the third pass of the first forging fire is pressed down to regularize the width of the steel ingot billet, such as Figure 1 W shown.

[0045] Optionally, the reduction amount of the third pass of the first forging fire in step S1 can be less than 20%, and only a small reduction amount is needed to regularize the width of the flat square billet, and the aspect ratio of the flat square billet is 1.42-1.55.

[0046] Optionally, after the flat square billet is upset in step S2, the upsetting ratio is controlled as 2.15-2.4, the billet is rotated 90° based on the diameter line and placed on the lower flat anvil, the reduction amount of the first pass of the second forging fire is 25% of the height of the flat square billet, and the reduction amount of the second pass of the second forging fire is 20% of the height of the flat square billet.

[0047] In this optional embodiment, the amount of reduction in the first pass of the second forging fire is greater than the amount of reduction in the second pass of the second forging fire, and an asymmetric amount of reduction is used to compact the billet while reconstructing the internal defects of the billet, thereby ensuring that the core defects of the billet can be fully welded, obtaining a denser organizational structure, and increasing the flaw detection pass rate of the supporting roller product.

[0048] Optionally, after the second forging pass is performed in step S2, the flat square billet is rotated 90 degrees with the axis as the reference, and the third forging pass is performed on a pair of roller surfaces with a smaller area, and the flat square billet is rotated 90 degrees with the axis as the reference, and the fourth forging pass is performed.

[0049] In this optional embodiment, the blank is further compacted by repeatedly using an asymmetric reduction amount to obtain a denser organizational structure, thereby further improving the flaw detection pass rate of the support roller product.

[0050] Optionally, the amount of reduction in the fifth pass of the second forging fire is greater than the amount of reduction in the sixth pass of the second forging fire.

[0051] Optionally, the reduction amount of the fifth pass of the second forging fire is 25%, and the reduction amount of the sixth pass of the second forging fire is 20%.

[0052] Optionally, the pressing amount of the seventh pass of the second forging fire is greater than the pressing amount of the eighth pass of the second forging fire. Repeat the above operation, and complete the eighth pass of the second forging fire, to ensure that the pressing amount of the odd-numbered passes of the second forging fire is always greater than the pressing amount of the even-numbered passes.

[0053] 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 asymmetrically compacting the core of a support roller, characterized in that: The following steps are involved: S1, pre-drawn flat square forging: in the first forging process, the upper and lower flat anvils are used to pre-draw the steel ingot blank, the anvils are arranged from the riser end to the nozzle end, the full anvil is fed, and the first pass of the first forging process is completed. The steel ingot blank is rotated 180 degrees with the axis as the reference, and the second pass of the first forging process is performed. The steel ingot blank is rotated 90 degrees with the axis as the reference, and the third pass of the first forging process is performed to obtain a flat square blank with an aspect ratio of 1.42-1.55; S2, upsetting and drawing forging: the second upsetting and drawing forging fire, after the steel ingot billet is upset, the upsetting ratio is controlled according to 2.15-2.4, the flat square billet is drawn and compacted by upper and lower flat anvils, the first pass of the second forging fire is pressed on a pair of surfaces with a smaller area of ​​the flat square billet, the flat square billet is rotated 90 degrees with the axis as the reference, and the second pass of the second forging fire is pressed, and the above operation is repeated, and eight passes of the second forging fire are pressed to ensure that the pressing amount of the odd-numbered passes of the second forging fire is greater than the pressing amount of the even-numbered passes; the flat square billet is chamfered and rounded; S3, forging finished products: The third forging fire is to draw and cut the finished products, using an 850-wide upper flat and lower V-shaped anvil to draw the large circle of the roller body of the round billet, and then draw and cut the billet in turn to obtain the finished support roller.

2. The forging method of asymmetrically compacting the core of a support roller according to claim 1, characterized in that: The width of the upper and lower flat anvils in step S1 is the same as the width of the upper and lower flat anvils in step S2.

3. The forging method of asymmetrically compacting the core of a support roller according to claim 1, characterized in that: The width of the upper flat and lower V-shaped anvil in step S3 is smaller than the width of the upper and lower flat anvils in step S2.

4. The forging method of asymmetrically compacting the core of a support roller according to claim 1, characterized in that: In step S1, the reduction amount of the first pass of the first forging fire is 20% of the height of the steel ingot blank.

5. The forging method of asymmetric compaction of the core of a support roller according to claim 1, characterized in that: In step S1, the relative feed rate of the second pass of the first forging fire is 0.8-1.

2.

6. The forging method of asymmetric compaction of the core of a support roller according to claim 1, characterized in that: After the third pass of the first forging process in step S1 is completed, the rotation forging is no longer performed.

7. The forging method of asymmetrically compacting the core of a support roller according to claim 1, characterized in that: In step S2, the reduction amount of the first pass of the second forging fire is 25% of the height of the flat square billet, and the reduction amount of the second pass of the second forging fire is 20% of the height of the flat square billet.

8. The forging method of asymmetric compaction of the core of a backup roller according to claim 1, characterized in that: The step S2 specifically includes upsetting the steel ingot billet, and the upsetting ratio is controlled as 2.15-2.4; pressing the first pass of the second forging fire onto a pair of surfaces with a smaller area of ​​the flat square billet, and pressing down 25% of the height of the flat square billet; rotating the flat square billet 90 degrees with the axis as the reference, pressing the second pass of the second forging fire, and pressing down 20% of the height of the flat square billet; repeating the above operation, pressing the second forging fire for eight passes, ensuring that the pressing down of the odd-numbered passes of the second forging fire is greater than the pressing down of the even-numbered passes; and rounding the flat square billet after chamfering the octagon.

9. The forging method of asymmetrically compacting the core of a support roller according to claim 8, characterized in that: The reduction amount of the odd-numbered passes is 25% of the height of the flat square billet.

10. The forging method of asymmetrically compacting the core of a support roller according to claim 9, characterized in that: The pressing amount of the even-numbered passes is 20% of the height of the flat square billet.

Images