Preparation method of sector plate for coiling block of coiling machine

Abstract

The invention relates to a preparation method of a fan-shaped plate for a coiling block of a coiling machine, which is characterized in that the cost of a manufacturing tool is reduced under the condition of ensuring efficient forming of the fan-shaped plate by carrying out specific matching type setting on forging equipment and carrying out forging and forging post-treatment according to specific modes and parameters by using the equipment in a combined manner; two sector plates with the thicker ends connected are produced at a time in a back-to-back forging mode, the machining efficiency is improved by 80%-85%, the yield is improved by 3%-5%, the cost is reduced, the production efficiency is improved, and the forging efficiency is improved by 10%-15%.

Description

Technical Field

[0001] The invention belongs to the technical field of steel forging, and in particular relates to a method for preparing a fan-shaped plate for a coiler drum. Background Art

[0002] The fan-shaped plate is one of the important parts on the coiler drum. The coiler drum is mainly composed of a hollow shaft, a wedge-shaped shaft, a fan-shaped plate, a connecting rod, a plunger and an expansion and contraction cylinder. Among them, the fan-shaped plate is the key part on the coiler drum. Each drum is composed of four fan-shaped plates to form a cylinder.

[0003] At present, there are three main ways to form fan-shaped plates:

[0004] Method 1: Forging blank is a flat blank, and then machining it into shape. This method is simple, but the machining excess is large, the yield rate is low, the machining cycle is long, and the cost is high. The general process is: heating → forging blank → annealing → band saw slitting → machining.

[0005] Method 2: The forged blank is a cylinder, which is cut into four fan-shaped blanks using a vertical saw, and finally machined on a lathe. This method has a high yield rate and small machining allowance, but the blank structure is complex and difficult to machine. Production must be done in groups of four fan-shaped plates, which has great limitations. The general process is: heating → forging → punching → mandrel drawing → annealing → band saw slitting → machining.

[0006] Method 3: The forging blank is in the shape of two fan-shaped plates that are interlocked end to end. A milling machine is used to mill out a cutter groove at one end, and then the blank is cut into two fan-shaped plates by a vertical saw, and finally processed into shape. This method is the current mainstream manufacturing method. This method requires the production of a pair of arc-shaped anvil tools, and the tool production cost is high. The contact area between the two plates is large, and sufficient processing allowance must be reserved. In addition, the machining is difficult. Using a band saw to cut longitudinally is very likely to cause sawing deviation and cause waste. The interlocking forming method has a large cross-sectional area after forging. If the forging ratio requirements are to be met, the number of upsetting and drawing needs to be increased, resulting in energy waste. The general process is: heating → forging blank → arc-shaped anvil forming → annealing → band saw cutting → machining.

[0007] The Chinese invention patent announcement text CN108942093B discloses a method for manufacturing a fan-shaped plate forging for an economical coiler drum. By using forging devices with various structures such as an upper flat anvil and a lower V-shaped anvil, the forming rate is improved. However, the preparation method has high requirements on the device.

[0008] Chinese invention patent publication CN111167984A discloses a forging method for forging a sector plate using an arc anvil. An arc anvil is used, but each anvil needs to be set up, and various equipment such as an upper flat anvil, a lower V-shaped anvil, an arc anvil seat and an arc anvil need to be set up. The subsequent machining requirements are high, so the efficiency needs to be improved relatively speaking. Summary of the invention

[0009] The present invention proposes a method for preparing a fan-shaped plate for a coiler drum, which is intended to solve the problems of high forging cost and great sawing difficulty. The method is realized by designing new tools and new forging forming methods, and forging is performed in a "back-to-back" form. The "back-to-back" form means that two fan-shaped plates are produced at a time, and the back of the higher end of the two fan-shaped plates is an integrated structure. After forming, the two fan-shaped plates are formed by longitudinal cutting through this part, and the higher end is the "big platform" and the lower other section of the platform is the "small platform".

[0010] This is achieved through the following technical means:

[0011] A method for preparing a fan-shaped plate for a coiler drum, the method comprising the following steps:

[0012] (1) Preparation of forging anvil: a wide upper flat anvil, a narrow upper flat anvil, a lower flat anvil and a lower arc-shaped anvil are provided, wherein the width of the wide upper flat anvil is B1, the width of the narrow upper flat anvil is B2, the longitudinal section of the lower arc-shaped anvil is fan-shaped, the arc radius of the lower arc-shaped anvil is R1, the distance between the two ends of the fan-shaped anvil is D1, the distance between the lowest end of the final product of the fan-shaped plate for the coiler drum and the top of the large platform of the fan-shaped plate for the coiler drum is H0, the width of the small platform or large platform of the fan-shaped plate for the coiler drum is B0, the length of the small platform of the fan-shaped plate for the coiler drum is L0, the total length of the fan-shaped plate for the coiler drum is Lt, and 1.15≤R1 / H0≤1.65, 1.005≤D1 / B0≤1.15, 0.45≤B2 / D1≤0.82, 0.95≤B1 / D1≤1.4 are satisfied.

[0013] (2) Heating the steel ingot: placing the steel ingot in a heating furnace for heating at a temperature of 1180-1200° C. for 300-400 min. After being taken out of the furnace, directly proceeding to step (3).

[0014] (3) Forging and blanking: The steel ingot obtained after heating and heat preservation in step (2) is subjected to the first roughening, roughening to 45-55% of the original length of the steel ingot, and then the first drawing is carried out, the drawing length is L1, wherein 0.25≤L1 / Lt≤0.4, and then the second roughening is carried out, roughening to 45-55% of L1, and then the second drawing is carried out, the drawing length is also L1, and then the blank obtained after blanking is returned to the heating furnace, and is kept warm at a temperature of 1180-1200°C for 1-2h.

[0015] (4) Rolling: After the insulation in step (3) is completed, the billet is placed on the lower flat anvil, and the billet is forged by the wide upper flat anvil until the billet has a diameter or an equivalent diameter of D2, wherein 1.51≤D2 / H0≤2.18, and 0.833≤D2 / D1≤0.95.

[0016] (5) Curved anvil blank making: the blank after the rounding forging in step (4) is placed in the lower curved anvil, and then the blank is forged by the wide upper flat anvil until the height of the blank is H1, wherein 1.05≤H1 / H0≤1.48.

[0017] (6) Forming forging: The blank obtained in step (5) is marked and divided in the length direction, and the length of the material for the large platform and the small platform is marked respectively (pinch the platform and divide the material), and then the wide upper flat anvil in step (5) is replaced with the narrow upper flat anvil, and then the blank obtained after forging in step (5) is forged with the small platform by the narrow upper flat anvil. During forging, the position of the large platform is reserved, and the small platform is forged on both sides of the large platform by the narrow upper flat anvil. The pressing amount of each pass is 50 to 80 mm, and the starting position of each pass is Avoid the contact area between the large table and the lower arc anvil during the previous forging, and rotate the billet to the side facing upward for light pressure forging in the width direction in each pass, and then turn it back to the direction of the large table facing upward for the next forging. After the height of the small table position is forged to the final height of the small table by the narrow upper flat anvil, the middle part of the two small tables is forged with multiple passes of the large table by the narrow upper flat anvil. After the distance between the top of the large table and the lowest end of the fan-shaped plate for the coiler drum is forged to be H0, the forging is completed.

[0018] (7) Annealing: Place the material after forging in step (6) into an annealing furnace, heat it to 740-760°C at a rate of 80-100°C / min, keep it at this temperature for 70-75 hours, and then cool it to 130-170°C at a rate of 15-20°C / min before taking it out of the annealing furnace.

[0019] (8) Cutting: The material obtained after annealing in step (7) is cut longitudinally from the middle of the platform and the flat ends at both ends are sawed to obtain a fan-shaped plate product for the coiler reel.

[0020] Preferably, the total time required for step (4) and step (5) is 25 to 35 minutes.

[0021] Preferably, the duration of step (6) is 30 to 40 minutes.

[0022] Preferably, the total time for the two roughening and stretching in step (3) is 40 to 50 minutes.

[0023] Preferably, after step (4) is completed, the billet obtained after spherical forging is placed in a heating furnace and kept warm at a temperature of 1180 to 1200° C. for 0.5 to 1 h, and then step (5) is carried out.

[0024] Preferably, after step (8), the following steps are further performed:

[0025] (9) The fan-shaped plate product for the coiler drum obtained after slitting in step (8) is subjected to chamfering treatment on the sawn surface and grinding treatment on the surface defects.

[0026] Preferably, after step (9), the following steps are further performed:

[0027] (10) The product after the treatment in step (9) is placed in a quenching heating furnace for heating to 1000-1100° C., kept at this temperature for 6.5-10 hours, taken out of the furnace and air-cooled to a product surface temperature of 850-950° C., and then water-quenched to obtain a tempered coiler reel fan-shaped plate product.

[0028] Preferably, the width of the lower flat anvil is B3, wherein 0.25≤B3 / L0≤0.5 or 0.95≤B3 / D1≤1.4.

[0029] Preferably, R1 and B0 also satisfy: 0.59≤R1 / B0≤0.85.

[0030] Preferably, in step (5), the arc-shaped anvil is used to forge the blank into a shape with a flat upper portion and an arc-shaped lower portion, and the reduction amount in each forging pass is 50 to 80 mm.

[0031] Preferably, the steel ingot in step (2) is X22CrMoV12-1 steel, and the composition of the steel ingot is as follows by mass percentage: C: 0.17%~0.24wt.%, Si: 0.2%~0.4wt.%, Mn: 0.3%~0.8wt.%, P≤0.03wt.%, S≤0.015wt.%, Cr: 10%~12.5wt.%, Ni: 0.3%~0.8wt.%, Mo: 0.8%~1.2wt.%, V: 0.25%~0.35wt.%, and the remainder is Fe and unavoidable impurities.

[0032] Preferably, the starting position of each forging pass avoids the contact position between the large platform and the lower arc anvil during the previous forging pass. Specifically, the starting position of each forging pass is staggered by 30 to 50 mm from the contact position between the large platform and the lower arc anvil during the previous forging pass.

[0033] The effects of the present invention are:

[0034] 1. In the conventional production of the existing process, the dedicated arc anvils need to be used in pairs, and the tool modification requirements for the arc anvils are high. The present invention sets a lower arc anvil with a specific structure, and selects a specific wide upper flat anvil and a narrow upper flat anvil to perform a "back-to-back" forging process on the fan-shaped plate. The equipment modification is closely coordinated with the specific "back-to-back" forging method, and the equipment modification amount is low. Under the condition of ensuring efficient forming of the fan-shaped plate, the cost of manufacturing tools is reduced.

[0035] 2. The present invention specifically sets the ratios between the radius of the arc anvil, the distance between the fan-shaped edges, and the width, height, and other lengths of the final product, so that during the forging process, the product is always formed into an arc surface inside the arc anvil. The specific setting of these proportional relationships avoids forging defects caused by a certain part or several parts easily exceeding the fan-shaped part of the arc anvil during the forging process, while also being able to better meet the requirements of forging a structure with an arc-shaped lower side and a flat upper side.

[0036] 3. The present invention adopts a "back-to-back" forging method (producing two fan-shaped plates connected at one end with a thicker thickness) by setting the structure of the specific arc anvil and the matching method of the product and the forging method. In the end, the final fan-shaped plate can be formed by direct longitudinal cutting in the middle. The machine sawing difficulty is low, the sawing scrap rate is low, and the sawing time is not affected by the length of the fan-shaped plate itself. The time is fixed at 3H to 5H, and the processing efficiency can be improved by 80% to 85%. Through the forging method of the "back-to-back" parameter setting of the present invention, the forging and machining allowances are reduced, and the yield rate is high. The yield rate of the present invention is improved by 3% to 5% compared with the prior art.

[0037] 4. The present invention sets a specific forging method, performs forging in a specific structure and an arc anvil matched with the product, sets a specific ratio in each stage and the pass setting in the forging process, and cooperates with the subsequent specific annealing treatment of specific temperature and duration, so that in the roughing and drawing process, only two roughing and drawing are required, combined with the subsequent forging of multiple passes of wide flat anvils and narrow flat anvils in a specific arc and the annealing process setting specifically for the forged product, the defects such as shrinkage cavities inside the product and the uniformity of alloy elements are strengthened in multiple steps. Since the subsequent forging in the arc anvil of a specific arc after roughing and drawing is set, each angle is deformed, so that the defects such as shrinkage cavities in the fan-shaped plate are well eliminated. With the specific coordinated annealing treatment for the product, the alloy elements can be well homogenized, so that there is no need for excessive roughing and drawing, and only two times are needed to achieve the existing equivalent technical effects such as internal uniformity, thereby reducing costs and improving production efficiency. The forging efficiency is improved by 10% to 15%. At the same time, preferably, the present invention adopts specific forging and heat treatment processes to process specific steel types, so that the coordinated cooperation of the two can produce a fan-shaped plate product that meets the requirements.

[0038] 5. The present invention specially designs the starting position of each forging pass to avoid the contact position between the large table and the lower arc anvil during the previous forging pass during the forging process of the small table, and in each pass, the blank is rotated to the side facing upward for light pressure forging in the width direction and then turned back to the direction of the large table facing upward for the next forging pass. In the case of the specific proportions of the arc anvil and the fan-shaped plate of the present invention, it is ensured that the arc portion of the large table will not protrude from the edge of the arc anvil during each forging pass, thereby avoiding the problem of step defects in the arc portion of the large table. The starting position of each forging pass avoids the contact position between the large table and the lower arc anvil during the previous forging pass, thereby avoiding excessive forging at this position. In addition, in combination with the fact that the blank is rotated to the side facing upward for light pressure forging in the width direction in each pass, its side is forged in each pass to avoid excessive protrusion of material from this position, thereby effectively avoiding the problem of step defects in the arc portion of the large table. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a front view schematic diagram of the "back-to-back" type fan-shaped plate blank of the present invention.

[0040] Figure 2 It is a left-side structural schematic diagram of the lower arc anvil of the present invention.

[0041] Figure 3 It is a left-side structural schematic diagram of the "back-to-back" type fan-shaped plate blank and the lower arc-shaped anvil of the present invention.

[0042] Among them: 0-lower arc anvil, 1-large table, 2-small table, 3-longitudinal cutting line, H0-the distance between the lowest end of the final product of the fan-shaped plate for the coiler drum and the top of the large table of the fan-shaped plate for the coiler drum, L0-the length of the small table, B0-the width of the small table or the large table, R1-the arc radius of the lower arc anvil, D1-the distance between the two ends of the fan, Lt-the total length of the two "back-to-back" fan-shaped plates for the coiler drum. DETAILED DESCRIPTION

[0043] The process technology scheme of the present invention is further illustrated below by combining embodiments and drawings. The orientations involved in this specification are based on the orientations of the present invention during normal operation, and do not limit the orientations during storage and transportation. They only represent relative positional relationships, not absolute positional relationships. Specific implementation methods Unless otherwise described, each feature is only an example of a series of equivalent or similar features. Just to help understand the present invention, those skilled in the art should understand that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0044] Example 1

[0045] This embodiment uses a 4500t press forging machine and a 60t rail-operated vehicle, an upset leak plate, and a wide upper flat anvil, a narrow upper flat anvil, a lower flat anvil, and a lower arc anvil to forge the "back-to-back" type fan-shaped plate. The width B1 of the wide upper flat anvil is 600mm, the width B2 of the narrow upper flat anvil is 350mm, the longitudinal section of the lower arc anvil is fan-shaped, the arc radius R1 of the lower arc anvil is 400mm, the distance D1 between the two ends of the fan-shaped is 600mm, the distance H0 between the lowest end of the final product of the fan-shaped plate for the coiler drum and the top of the large platform of the fan-shaped plate for the coiler drum is 300mm, the width B0 of the small platform or large platform of the fan-shaped plate for the coiler drum is 565mm, and the fan-shaped plate for the coiler drum is 565mm. The length L0 of the small table of the plate is 1530mm, and the total length Lt of the fan-shaped plate for the "back-to-back" coiler reel is 3580mm, among which R1 / H0=1.33, D1 / B0=1.06, B2 / D1=0.583, B1 / D1=1, and the above values ​​all meet the requirements of 1.15≤R1 / H0≤1.65, 1.005≤D1 / B0≤1.15, 0.45≤B2 / D1≤0.82, 0.95≤B1 / D1≤1.4.

[0046] (2) Heating the steel ingot: The steel ingot is placed in a heating furnace for heating at a temperature of 1192° C. for 350 min. After being taken out of the furnace, the ingot directly enters step (3).

[0047] (3) Forging and blanking: Use a clamp (with a diameter matching that of the leak plate) to perform the first roughening of the steel ingot obtained after heating and heat preservation in step (2), roughening it to 50% of its original length, and then perform the first drawing, with the drawn length L1 being 1100 mm, satisfying the requirement of 0.25≤L1 / Lt≤0.4, and then perform the second roughening, roughening it to 50% of L1, and then perform the second drawing, with the drawn length also being L1. This step takes 45 minutes, and then the blank obtained after blanking is returned to the heating furnace and kept warm at a temperature of 1192°C for 1.8 hours.

[0048] (4) Rolling: After the insulation in step (3) is completed, the billet is placed on the lower flat anvil, and the billet is forged by the wide upper flat anvil until the equivalent diameter D2 of the billet is 565 mm, meeting the requirements of 1.51≤D2 / H0≤2.18 and 0.833≤D2 / D1≤0.95.

[0049] (5) Curved anvil blank making: Place the billet after rounding forging in step (4) into the lower curved anvil, and then forge the billet through the wide upper flat anvil to forge the upper flat and lower curved shapes. A 60mm margin is directly reserved for the height, and the reduction amount for each pass is 50 to 80mm. The height H1 of the billet is forged to be 380mm, meeting the requirement of 1.05≤H1 / H0≤1.48. This step takes 25min to 35min.

[0050] (6) Forming forging: the blank obtained in step (5) is divided into two parts by pinching the table, and then the wide upper flat anvil in step (5) is replaced with the narrow upper flat anvil, and then the blank obtained after forging in step (5) is forged by small table forging by the narrow upper flat anvil, and the position of the large table is reserved during forging, and the two sides of the large table are forged by small table forging by the narrow upper flat anvil, and the pressing amount of each pass is 50 to 80 mm, and the starting position of each pass avoids the contact part between the large table and the lower arc anvil in the previous forging, and each pass is forged by the narrow upper flat anvil. The contact part between the secondary fan-shaped plate large table and the arc anvil is staggered by about 35mm (error ±3mm), and in each pass, the billet is rotated to the side facing upward for light pressure forging in the width direction and then turned back to the direction of the large table upward for the next forging. After the height of the small table position is forged to the final height of the small table by the narrow upper flat anvil, the middle part of the two small tables is forged into a large table for multiple passes by the narrow upper flat anvil. After the distance between the top of the large table and the lowest end of the fan-shaped plate for the coiler drum is forged to be H0, the forging is completed.

[0051] (7) Annealing: Place the material after forging in step (6) into an annealing furnace, heat it to 750°C at a rate of 90°C / min, and keep it at this temperature for 72 hours. After the end of the heat preservation, cool it to 155°C at a rate of 18°C / min and then take it out of the annealing furnace.

[0052] (8) Cutting: The material obtained after annealing in step (7) is cut into Figure 1 As shown, after longitudinally cutting from the middle of the platform and sawing the flat ends at both ends, a fan-shaped plate product for the coiler reel is obtained.

[0053] The final arc-shaped portion of this embodiment has no defects such as steps.

[0054] Comparative Example 1

[0055] The other configurations of this comparative example are basically the same as those of Example 1, except that a lower arc anvil is not provided and a lower flat anvil is used as a replacement. The fan-shaped plates are also produced in a "back-to-back" manner, specifically including the following steps:.

[0056] Press the pliers (diameter matches the leak plate), upset once and pull once, upset to half the original ingot height, pull to the required billet size; upset twice and pull twice, upset to half the length of the first pull, pull to the billet size. This step takes 40min to 50min, return to the furnace for insulation, and the insulation time is 1H to 2H.

[0057] The upper and lower flat anvils are used to round the blank to D2 = φ460mm, and the upper flat anvil and lower curved anvil are used to forge the blank into upper flat and lower curved shapes, and the height is directly forged to the finished product size. It is found that the large platform of the "back-to-back" finished product before longitudinal cutting is not wide enough.

[0058] This is because the lower arc anvil is not used, so the equivalent diameter of the rolling circle can only be reduced. However, since the rolling diameter is too small and the widening of the stage is not enough, the final product cannot be formed and the size requirements of the product cannot be met.

[0059] Comparative Example 2

[0060] The other configurations of this comparative example are basically the same as those of Example 1, except that no narrow upper flat anvil is provided, and the fan-shaped plates are produced in a "back-to-back" manner. The specific steps are as follows:

[0061] Press the pliers (diameter matches the leak plate), upset once and pull once, upset to half the original ingot height, pull to the required billet size; upset twice and pull twice, upset to half the length of the first pull, pull to the billet size. This step takes 40min to 50min, return to the furnace for insulation, and the insulation time is 1H to 2H.

[0062] Use wide upper flat anvil and lower flat anvil to round the blank to φ550~φ600mm, use wide upper flat anvil and lower arc anvil to forge the blank into upper flat and lower arc shapes, and directly forge the height to the finished product size, with each pass pressing 50~80mm, and the width is better. This step takes 25min~35min.

[0063] Use a wide upper flat anvil (the width of which is the same as that of the wide upper flat anvil in Example 1, both of which are the same width as the curved anvil) and the curved anvil to forge left and right small platforms.

[0064] However, since the narrow upper flat anvil was not used when forging the lower table in this comparative example, and since the wide upper flat anvil is the same width as the curved anvil, the pressure during forging is concentrated on the center of the anvil, and the upper and lower deformations of the billet are consistent, the eccentric effect of the small table and the large table cannot be forged, and the qualified rate of the obtained products is not high.

[0065] Comparative Example 3

[0066] The other configurations of this comparative example are basically the same as those of Example 1, with the main difference being that in step (4), the rolling diameter is larger than that of Example 1, i.e., 590 mm, and the narrow upper flat anvil is the same as that of Example 1, with a width of 250 mm less than that of the curved anvil, and the fan-shaped plates are produced in a "back-to-back" manner. Specifically, the following steps are included:

[0067] The clamp handle (diameter matches the leak plate) is used for one upsetting and one pulling, upsetting to half the original ingot height, and pulling to the required billet size of 600mm (±20mm); two upsetting and two pulling, upsetting to half the length of the first pulling, and pulling to the billet size. This step takes 45 minutes, and the furnace is also returned to heat preservation, and the heat preservation time is 1.5 hours.

[0068] Use wide upper flat anvil and lower flat anvil to round the blank to φ590mm, use wide upper flat anvil and lower arc anvil to forge the blank into upper flat and lower arc shapes, and forge the height directly to the finished product size, with each pass pressing 50-80mm. This step takes 30 minutes.

[0069] The narrow upper flat anvil and lower curved anvil are used to forge the left and right small tables, with each pass pressing down 30 to 50 mm. After the small table is forged to the finished product size, the eccentric effect is successfully forged.

[0070] The comparative example adjusts the rolling diameter, and its diameter is larger than that of the previous comparative example. The comparative example has D2 / D1=0.983, which does not meet the requirement of 0.833≤D2 / D1≤0.95. When the narrow upper flat anvil is used to forge the small table, it will exceed the curved anvil, thereby causing defects such as steps and flash on the width edge of the small table. It is proved that the use of two flat anvils with specific size ratios of the present invention and the curved anvil with specific size ratios of the present invention at different stages is most suitable for the specific products of the present invention with specific shapes and ratios, and changing any one of them will cause defects.

[0071] Comparative Example 4

[0072] The other configurations of this comparative example are basically the same as those of Example 1, except that R1 is 338 mm, D1 is 566 mm, R1 / H0=1.127, D1 / B0=1.0018, which do not meet the requirements of 1.15≤R1 / H0≤1.65, 1.005≤D1 / B0≤1.15. Using the same forging method as Example 1, during the forging of the small platform in step (6), defects such as flash on the edge of the small platform, steps, and steps on the arc-shaped part of the large platform appeared, and thus the product could not be formed.

[0073] Comparative Example 5

[0074] The other configurations of this comparative example are substantially the same as those of Example 1, except that, in step (6), the small table forging is performed on both sides of the large table by means of a narrow upper flat anvil, the reduction amount of each pass is 50 to 80 mm, and the starting position of each pass does not intentionally avoid the contact portion between the large table and the lower arc-shaped anvil during the previous forging pass. The forging is performed sequentially, and the forging is completed when the distance between the top of the large table and the lowest end of the fan-shaped plate for the coiler drum is H0.

[0075] The other settings are the same as those in Example 1, and the eccentric effect is successfully forged, and there is no flash on the edge of the small platform. However, even if a narrow upper flat anvil is used, the contact part between the billet and the curved anvil is still deformed, and a small step defect is finally formed at the curved part of the large platform. This is because the starting position of each forging pass is not deliberately avoided from the contact part between the large platform and the lower curved anvil during the previous forging pass, resulting in excessive local forging, which leads to steps at the curved part of the large platform in the final product.

[0076] Comparative Example 6

[0077] The other configurations of this comparative example are basically the same as those of Example 1, except that the roughing and drawing in step (3) of Example 1 is set to three roughing and three drawing, and the other configurations are exactly the same as those of Example 1. The final products of Example 1 and Comparative Example 6 are tested by flaw detection, and both meet JB / T5000.15-2007 Level 2. The internal defects of Comparative Example 6 are basically the same as those of Example 1. That is, even if one more roughing and drawing is performed, the technical effect in this aspect is basically the same as that of two roughing and drawing (because the subsequent specific forging method set by the present invention through the size ratio etc. will also have an effect on this type of defect, so only two roughing and drawing are required), and one or more roughing and drawing will increase the cost and reduce the production efficiency. Therefore, from this perspective, the specific configuration of the present invention further improves the production efficiency.

[0078] The technical principle of the present invention is described above in conjunction with specific embodiments. The technical effects without comparison can be clearly described through the textual description of the technical effects, which does not mean that the invention is low in height. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the protection scope of the present invention.

Claims

1. A method for preparing a fan-shaped plate for a coiler drum, characterized in that: The preparation method comprises the following steps: (1) Preparation of forging anvil: a wide upper flat anvil, a narrow upper flat anvil, a lower flat anvil and a lower arc-shaped anvil are provided. The width of the wide upper flat anvil is B1, the width of the narrow upper flat anvil is B2, the longitudinal section of the lower arc-shaped anvil is fan-shaped, the arc radius of the lower arc-shaped anvil is R1, the distance between the two ends of the fan-shaped anvil is D1, the distance between the lowest end of the final product of the fan-shaped plate for the coiler drum and the top of the large platform of the fan-shaped plate for the coiler drum is H0, the width of the small platform or large platform of the fan-shaped plate for the coiler drum is B0, the length of the small platform of the fan-shaped plate for the coiler drum is L0, the total length of the two "back-to-back" fan-shaped plates for the coiler drum is Lt, and 1.15≤R1 / H0≤1.65, 1.005≤D1 / B0≤1.15, 0.45≤B2 / D1≤0.82, 0.95≤B1 / D1≤1.4 are satisfied; (2) Heating the steel ingot: placing the steel ingot in a heating furnace for heating at a temperature of 1180 to 1200° C. for 300 to 400 min. After being taken out of the furnace, directly proceeding to step (3); (3) Forging and blanking: the steel ingot obtained after heating and heat preservation in step (2) is subjected to a first roughening, roughening to 45-55% of the original length of the steel ingot, and then a first drawing, the drawing length is L1, wherein 0.25≤L1 / Lt≤0.4, and then a second roughening, roughening to 45-55% of L1, and then a second drawing, the drawing length is also L1, and then the blank obtained after blanking is returned to the heating furnace, and is kept at a temperature of 1180-1200° C. for 1-2 h; (4) Rolling: placing the blank after the heat preservation in step (3) on the lower flat anvil, and rolling the blank by the wide upper flat anvil until the diameter or equivalent diameter of the blank is D2, wherein 1.51≤D2 / H0≤2.18, and 0.833≤D2 / D1≤0.95; (5) Curved anvil blank making: placing the blank after the rounding forging in step (4) into the lower curved anvil, and then forging the blank by the wide upper flat anvil until the blank has a height of H1, wherein 1.05≤H1 / H0≤1.48; (6) Forming forging: The blank obtained in step (5) is marked in the length direction and divided into the materials, and the lengths of the large platform and the small platform are marked respectively. Then, the wide upper flat anvil in step (5) is replaced with the narrow upper flat anvil. Then, the blank obtained after forging in step (5) is forged with the small platform by the narrow upper flat anvil. During forging, the position of the large platform is reserved. The small platform is forged on both sides of the large platform by the narrow upper flat anvil. The pressing amount of each pass is 50 to 80 mm, and the starting position of each pass avoids the upper flat anvil. The contact part between the large table and the lower arc anvil during one forging, and the blank is rotated to the side facing upward for light pressure forging in the width direction in each pass, and then turned back to the direction of the large table facing upward for the next forging, after the height of the small table position is forged to the final height of the small table by the narrow upper flat anvil, the middle part of the two small tables is forged with multiple passes of the large table by the narrow upper flat anvil, and the forging is completed after the distance between the top of the large table and the lowest end of the fan-shaped plate for the coiler drum is H0; (7) Annealing: placing the material after forging in step (6) into an annealing furnace, heating it to 740-760°C at a rate of 80-100°C / min, keeping it at this temperature for 70-75 hours, and then cooling it to 130-170°C at a rate of 15-20°C / min before exiting the annealing furnace; (8) Cutting: The material obtained after annealing in step (7) is cut longitudinally from the middle of the platform and the flat ends at both ends are sawed to obtain a fan-shaped plate product for the coiler reel.

2. The method for preparing a fan-shaped plate for a coiler drum according to claim 1, characterized in that: The total time required for step (4) and step (5) is 25 to 35 minutes.

3. The method for preparing a fan-shaped plate for a coiler drum according to claim 1, characterized in that: The duration of step (6) is 30 to 40 minutes.

4. The method for preparing a fan-shaped plate for a coiler drum according to claim 1, characterized in that: The total time for the two roughening and stretching in step (3) is 40 to 50 minutes.

5. The method for preparing a fan-shaped plate for a coiler drum according to claim 1, characterized in that: After step (4) is completed, the blank obtained after spherical forging is placed in a heating furnace and kept warm at a temperature of 1180 to 1200° C. for 0.5 to 1 h, and then step (5) is carried out.

6. The method for preparing a fan-shaped plate for a coiler drum according to claim 1, characterized in that: After step (8), the following steps are also performed: (9) The fan-shaped plate product for the coiler drum obtained after slitting in step (8) is subjected to chamfering treatment on the sawn surface and grinding treatment on the surface defects.

7. The method for preparing a fan-shaped plate for a coiler drum according to claim 6, characterized in that: After step (9), the following steps are also performed: (10) The product after the treatment in step (9) is placed in a quenching heating furnace for heating to 1000-1100° C., kept at this temperature for 6.5-10 hours, taken out of the furnace and air-cooled to a product surface temperature of 850-950° C., and then water-quenched to obtain a tempered coiler reel fan-shaped plate product.

8. The method for preparing a fan-shaped plate for a coiler drum according to claim 1, characterized in that: The width of the lower flat anvil is B3, where 0.90≤B3 / D1≤1.5; In step (5), the arc-shaped anvil is used to forge the blank into a shape with a flat upper portion and an arc-shaped lower portion, and the reduction amount of each forging pass is 50 to 80 mm.

9. The method for preparing a fan-shaped plate for a coiler drum according to claim 1, characterized in that: The steel ingot in step (2) is X22CrMoV12-1 steel, and the composition of the steel ingot is calculated by mass percentage: C: 0.17% ~ 0.24wt.%, Si: 0.2% ~ 0.4wt.%, Mn: 0.3% ~ 0.8wt.%, P≤0.03wt.%, S≤0.015wt.%, Cr: 10% ~ 12.5wt.%, Ni: 0.3% ~ 0.8wt.%, Mo: 0.8% ~ 1.2wt.%, V: 0.25% ~ 0.35wt.%, and the remainder is Fe and unavoidable impurities.

10. The method for preparing a fan-shaped plate for a coiler drum according to claim 1 or 8, characterized in that: The starting position of each forging pass avoids the contact position between the large platform and the lower arc anvil during the previous forging pass. Specifically, the starting position of each forging pass is staggered by 30 to 50 mm from the contact position between the large platform and the lower arc anvil during the previous forging pass.

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