A method of forging a bd roll blank

Abstract

This invention discloses a BD roll blank forging method, specifically including the following steps: S1, rolling the roll body to the required dimensions; S2, marking and elongating the ingot tail; S3, marking the concave section; S4, using an upper special anvil and a lower flat anvil to elongate the concave section of the die; S5, finishing and dimensionalizing the non-die section of the roll body to obtain the BD roll blank. This invention can reasonably determine the allowance X of the roll body before forging the die, is applicable to various specifications, and obtains a BD roll blank that meets the specifications. It forges the roll blank to be as close as possible to the die shape, improves the net-to-gross ratio of the product, and saves raw materials and processing costs. At the same time, by using hooks and lugs to hang the upper anvil on the normally used flat anvil, the replacement time of the upper anvil can be reduced to 1 / 10 of the original time, reducing the risk of reflow.

Description

Technical Field

[0001] This invention relates to a BD roll blank forging method, belonging to the field of forging technology. Background Technology

[0002] H-beam rolling mill rolls, abbreviated as BD rolls, are used in the rolling mill stands of section steel rolling lines to perform the rolling task. After the billet is heated in the heating furnace, it enters the rolling mill stand for rolling to form a rolled billet of a certain shape and specification. BD rolls are mostly die rolls, including various specifications, such as different diameters and lengths of the roll body, and various numbers and specifications of the die patterns.

[0003] In the existing technology, BD rolls are generally forged as flat rolls. During rough machining, in order to ensure the product quality hardness index and usage requirements, the roll blank needs to be slotted and then heat-treated, which not only wastes raw materials, but also wastes processing costs.

[0004] Some manufacturers use concave forging, where the roller body is forged first, and then the concave groove is forged into the roller body. There are two difficulties in concave forging: First, BD rollers come in various specifications, and it is difficult to determine the allowance to be left on the roller body before forging the groove. If the allowance is too large, a lot of material will have to be removed from the groove during finishing, which still results in wasted raw materials and processing costs; if the allowance is too small, the forged groove will not meet the requirements, resulting in scrap. Secondly, different upper anvils are used when forging the die and the roll body of the BD roll, and the die specifications on the same BD roll are also diverse. Different upper anvils are used when forging different die shapes. However, replacing the upper anvil is quite cumbersome. It requires removing the conventional upper flat anvil and then installing a new upper anvil for the forging die shape. Because the connection between the upper hammer and the movable crossbeam is precise, alignment during installation is difficult, which increases the installation time of the upper anvil. The replacement time is generally 20-30 minutes. The long replacement time can easily lead to a drop in temperature and the disappearance of the forging zone, requiring re-reflow. It can also cause black skin to appear on the finished BD roll, affecting the final quality. In addition, the installation structure of the upper anvil is relatively tight, and frequent replacement can easily damage the locking cylinder, so the number of replacements should be minimized. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this invention provides a BD roll blank forging method, which can not only reasonably determine the allowance of the roll body before the forging die, obtain BD roll blanks that meet the specifications, and forge the roll blanks to be as close as possible to the die shape, thereby improving the net-to-gross ratio of the product and saving raw materials and processing costs; at the same time, it can also reduce the replacement time of the anvil and reduce the risk of reflow.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A method for forging BD roll blanks specifically includes the following steps:

[0008] S1. Roll body blanking to process requirement dimensions;

[0009] S2, the ingot tail engraving is elongated;

[0010] S3, Engraved at the recessed area;

[0011] S4. Use the upper special anvil and the lower flat anvil to lengthen the concave hole;

[0012] S5. Finish the non-perforated part of the roller body and determine its dimensions to obtain the BD roller blank.

[0013] A further improvement to the technical solution of the present invention is that the specific steps of the roll body blanking in step S1 are as follows:

[0014] S1-1, Pulling out the neck of the character;

[0015] S1-2. Determine the allowance X for the roller body before forging the die;

[0016] S1-3. X-draw the roller body according to process requirements and reserved allowance;

[0017] S1-4, the two roller necks at the capping end.

[0018] A further improvement to the technical solution of the present invention is that the formula for determining the reserved margin X in step S1-2 is as follows:

[0019]

[0020] Where X is the allowance reserved for the roller body before the forging die;

[0021] L is the length of the die clamping material of the roller body before the forging die;

[0022] D is the finished diameter of the roller body;

[0023] D1 is the diameter of the finished hole;

[0024] L1 is the finished hole length.

[0025] A further improvement of the technical solution of the present invention is that: in step S4, the special anvil includes a special anvil body arranged in a cuboid shape, and the top of the two sides of the special anvil body protrudes outward to form a hanging ear, and the middle of the hanging ear is provided with a slot. The top surface of the special anvil body near the hanging ear is provided with an opening, and the opening is a non-through hole.

[0026] A further improvement of the technical solution of the present invention is that the special anvil body and the BD roll blank forging method and the hanging ear are integrally formed.

[0027] A further improvement of the technical solution of the present invention is that the height of the hanging ear in the BD roll blank forging method gradually increases from the outside towards the direction of the special anvil body in the BD roll blank forging method.

[0028] A further improvement of the technical solution of the present invention is that the special anvil is hung on the flat anvil by a BD roll blank forging method using a hook, and the replacement time is short, which is 2 to 3 minutes.

[0029] A further improvement of the technical solution of the present invention is that: the hook, a BD roll blank forging method, has an I-shaped structure, and the cross-section of the outward protruding part at the upper and lower ends is semi-circular.

[0030] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0031] This invention can reasonably determine the allowance X of the roller body before forging the die, and is applicable to various specifications. It can obtain BD roller blanks that meet the specifications, forge the roller blanks to be as close as possible to the die shape, improve the net-to-gross ratio of the product, and save raw materials and processing costs.

[0032] This invention uses a combination of hooks and lugs to hang the upper anvil on a normally used flat anvil, which can reduce the replacement time of the upper anvil to 1 / 10 of the original time and reduce the risk of furnace failure.

[0033] The BD roller obtained by this invention has finer grains at the hole pattern, and its metallographic structure is superior to that of the flat roller method of forming the hole pattern. Attached Figure Description

[0034] Figure 1 This is a front view schematic diagram of the special anvil used in this invention;

[0035] Figure 2 This is the present invention. Figure 1 A cross-sectional diagram;

[0036] Figure 3 This is a top view of the special anvil used in this invention;

[0037] Figure 4 This is a front view schematic diagram of the hook of the present invention;

[0038] Figure 5 This is a left-side view of the hook of the present invention;

[0039] Figure 6 This is a schematic diagram of the BD roll blank of Embodiment 1 of the present invention;

[0040] The components include: 1. a dedicated anvil body; 2. a hanging ear; 3. an opening; and 4. a hook. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to embodiments:

[0042] A method for forging BD roll blanks specifically includes the following steps:

[0043] S1. Roll body blanking to process requirement dimensions;

[0044] S1-1, Pulling out the neck of the character;

[0045] S1-2. Determine the allowance X for the roller body before forging the die;

[0046] S1-3. X-draw the roller body according to process requirements and reserved allowance;

[0047] S1-4, the two roller necks at the capping end;

[0048] S2, the ingot tail engraving is elongated;

[0049] S3, Engraved at the recessed area;

[0050] S4. Use the upper special anvil and the lower flat anvil to lengthen the concave hole;

[0051] S5. Finish the non-perforated part of the roller body and determine its dimensions to obtain the BD roller blank.

[0052] The formula for determining the reserved margin X is as follows:

[0053]

[0054] Where X is the allowance reserved for the roller body before the forging die;

[0055] L is the length of the die clamping material of the roller body before the forging die;

[0056] D is the finished diameter of the roller body;

[0057] D1 is the diameter of the finished hole;

[0058] L1 is the finished hole length.

[0059] The above formula can reasonably determine the allowance X of the roller body before forging the die, which is applicable to various specifications and can produce BD roller blanks that meet the specifications. The roller blanks are forged to be as close as possible to the die shape, which can improve the net-to-gross ratio of the product and save raw materials and processing costs.

[0060] The special anvil used in step S4, such as Figures 1-3As shown, it includes a dedicated anvil body (1) arranged in a cuboid shape. The tops of both sides of the dedicated anvil body (1) protrude outward to form hanging ears (2), and the middle of the hanging ears (2) is provided with a groove. The dedicated anvil body (1) and the hanging ears (2) are integrally formed, and the height of the hanging ears (2) gradually increases from the outside towards the dedicated anvil body (1). Figures 4-5 As shown, the hook (4) has an I-shaped structure, and the cross-section of the outward protruding parts at the upper and lower ends is semi-circular. The semi-circular design makes it easier to rotate the hook (4) when it is removed.

[0061] When replacing the anvil, the upper part of the hook (4) is placed on the normal and applicable flat anvil, and the middle part is inserted into the groove of the hanging ear (2). The height of the hanging ear (2) gradually increases from the outside towards the special anvil body (1), so that the height of the hanging ear (2) is just enough for the hook (4) to be inserted, preventing the special anvil from shaking when it is working. The replacement time is 2 to 3 minutes.

[0062] The special anvil body (1) has an opening (3) on its top surface near the hanging ear (2), and the opening (3) is a non-through hole.

[0063] Example 1:

[0064] Producing a kind of Figure 6 The BD roller shown is produced by first removing the letter neck, then turning it around and removing the roller body to the process dimensions, according to the formula. Determine the allowance X, engrave the two roller necks at the end of the cap, and then press out two holes one by one. When pressing the holes, replace the anvil with the special anvil of this invention. The replacement time is 2 to 3 minutes. Then forge all the cap necks, cut off the excess material at the end of the cap, and trim the roller body and concave to the process dimensions. Finally, forge the letter neck and cut off the tail according to the process to complete the forging blank finished product.

[0065] The allowance X determined in this embodiment can forge the roll blank to be as close as possible to the die shape, improve the net-to-gross ratio of the product to 0.85-0.86, and save raw materials and processing costs.

Claims

1. A method for forging BD roll blanks, characterized in that, Specifically, the steps include the following: S1. Roll body blanking to process requirement dimensions; S2, the ingot tail engraving is elongated; S3, Engraved at the recessed area; S4. Use the upper special anvil and the lower flat anvil to lengthen the concave hole; S5. Finish the non-perforated part of the roll body and determine its dimensions to obtain the BD roll blank; The specific steps for roller body blanking in step S1 are as follows: S1-1, Pulling out the neck of the character; S1-2. Determine the allowance X for the roller body before forging the die; S1-3. X-draw the roller body according to process requirements and reserved allowance; S1-4, the two roller necks at the capping end; The formula for determining the reserved margin X in step S1-2 is as follows: Where X is the allowance reserved for the roller body before the forging die; L is the length of the die clamping material of the roller body before the forging die; D is the finished diameter of the roller body; D1 is the diameter of the finished hole; L1 is the finished hole length; In step S4, the special anvil includes a special anvil body (1) arranged in a cuboid shape. The top of the two sides of the special anvil body (1) protrudes outward to form a hanging ear (2), and the middle of the hanging ear (2) is provided with a groove. The top surface of the special anvil body (1) is provided with an opening (3) near the hanging ear (2), and the opening (3) is a non-through hole. The special anvil body (1) and the hanging ear (2) are integrally formed; The height of the hanging ear (2) gradually increases from the outside towards the special anvil body (1); The special anvil is hung on the flat anvil by a hook (4), and the replacement time is short, which is 2 to 3 minutes; The hook (4) has an I-shaped structure, and the cross-section of the outward protruding parts at the upper and lower ends is semi-circular.

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