CN213001816U - Nodular cast iron roughing roll - Google Patents
Nodular cast iron roughing roll Download PDFInfo
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- CN213001816U CN213001816U CN202021358451.XU CN202021358451U CN213001816U CN 213001816 U CN213001816 U CN 213001816U CN 202021358451 U CN202021358451 U CN 202021358451U CN 213001816 U CN213001816 U CN 213001816U
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Abstract
The utility model discloses a nodular cast iron roughing roll, three roll that down distributes in proper order from last has, be the top roll respectively, well roll and bottom roll, the roll has by the roll body of making with niobium nodular cast iron, the both ends of roll body are provided with a bearing installation department of making by adding niobium nodular cast iron respectively, the roll body is equipped with the radius angle with the junction of bearing installation department, the left end that wherein is located left bearing installation department is provided with the connecting portion of making by adding niobium nodular cast iron, the right-hand member of bearing installation department that is located the right side is provided with the transmission portion of making by adding niobium nodular cast iron, be provided with two pass along the length direction of top roll, three pass and four pass, be provided with one pass along the length direction of well roll, two pass, three pass and four pass, be provided with one pass on the length direction of bottom roll, Three pass and five pass. The tensile strength, the impact toughness and the thermal crack resistance of the roller are improved, and the service life of the roller is prolonged.
Description
Technical Field
The utility model belongs to the technical field of the technique of roll and specifically relates to a nodular cast iron roughing roll.
Background
As steel rolling enterprises develop towards the direction of green, environmental protection, energy conservation and resource conservation, the roughing mill used by the enterprises is searched for the product substitution with superior performance, lower cost, high tensile strength, good wear resistance, good thermal fatigue resistance and good impact toughness, in particular to a three-roll roughing mill. Traditional alloy steel 75CrMo, 70Mn2Mo, nodular graphite ball non-roller CrMo ball non-roller, low nickel CrMo ball non-roller. The former has low carbon content, poor wear resistance, about ten thousand tons of rolling quantity and easy generation of fatigue cracks, and after 5000 tons of rolling, the cracks extend and expand and have the width of 2-3 mm, so that concave-convex indentations appear on a rolled piece, and the quality of a subsequent product is influenced. The latter is because of the characteristics of casting process, and the top layer because the effect of the molten iron pouring into the golden die piece rapid chilling can form the hardness that better crystalline structure produced, but the top layer is inwards influenced by the cooling slowly, and crystalline structure can be progressively thick, and hardness progressively reduces poor, therefore forms great drop, influences the tensile strength of roll simultaneously. Due to the factors, when the roller is used for operation, the wear of the pass can be asynchronous, the wear of the depth part of the pass can be accelerated, the size deviation of a rolled piece is caused, and the rough rolling quality of the rolled piece is directly influenced. Therefore, the rolling efficiency is affected and roll breakage may occur.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: in order to overcome the defects in the prior art, the nodular cast iron rough roller is provided, the tensile strength, the impact toughness and the thermal cracking resistance of the roller are improved, and the service life of the roller is prolonged.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a nodular cast iron roughing roll, has three roll that from the top down distributes in proper order, and they are upper roll, well roll and lower roll respectively, the roll has the roll body of being made by adding niobium nodular cast iron, the both ends of roll body are provided with a bearing installation department of being made by adding niobium nodular cast iron respectively, and the roll body is equipped with the radius angle with the junction of bearing installation department, and wherein the left end that is located left side bearing installation department is provided with the connecting portion of being made by adding niobium nodular cast iron, and the right-hand member that is located right side bearing installation department is provided with the transmission portion of being made by adding niobium nodular cast iron, is provided with two pass, three pass and four pass along the length direction of upper roll, is provided with one pass, two pass, three pass and four pass along the length direction of well roll, is provided with one pass, three pass and four pass along the length direction of lower, Three pass and five pass.
More specifically, in the above technical solution, the first hole pattern, the second hole pattern, the third hole pattern, the fourth hole pattern, and the fifth hole pattern are sequentially distributed from left to right.
More specifically, in the above technical solution, the diameter of the roller body of the upper roller is greater than the diameter of the roller body of the middle roller, and the diameter of the roller body of the middle roller is greater than the diameter of the roller body of the lower roller.
More specifically, in the above technical solution, the axis of the upper roll, the axis of the middle roll and the axis of the lower roll are distributed in parallel.
More specifically, in the above technical solution, the axis of the roll body, the axis of the bearing mounting portion, the axis of the connecting portion, and the axis of the transmission portion are located on the same straight line.
More specifically, in the above technical solution, the roller body, the bearing mounting portion, the connecting portion, and the transmission portion are an integrated structure.
The utility model has the advantages that: the utility model provides a pair of nodular cast iron roughing roll, structural design is reasonable, improves tensile strength, impact toughness, thermal crack resistance and the life of roll, is convenient for extensively promote and use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers in the figures are: 1. a roll body; 2. rounding off; 3. a bearing mounting portion; 4. a connecting portion; 5. a transmission section; 6. two pass of hole pattern; 7. three pass of holes; 8. four pass of hole pattern; 9. a hole pattern; 10. five pass holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "one side", "the other side", "both sides", "between", "middle part", "upper end", "lower end", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the utility model discloses a nodular cast iron roughing roll, have three rolls that from the top down distributes in proper order, they are upper roll, well roll and lower roll respectively, the roll has the roll body 1 made by adding niobium nodular cast iron, the both ends of roll body 1 are provided with a bearing installation department 3 made by adding niobium nodular cast iron respectively, the junction of roll body 1 and bearing installation department 3 is equipped with radius angle 2, wherein the left end that lies in left bearing installation department 3 is provided with connecting portion 4 made by adding niobium nodular cast iron, the right-hand member that lies in right side bearing installation department 3 is provided with transmission portion 5 made by adding niobium nodular cast iron, there are two pass 6, three pass 7 and four pass 8 along the length direction of upper roll, there are one pass 9, two pass 6, three pass 7 and four pass 8 along the length direction of well roll, a single pass 9, three passes 7 and five passes 10 are provided along the length of the lower roll.
Wherein, the first pass 9, the second pass 6, the third pass 7, the fourth pass 8 and the fifth pass 10 are distributed from left to right in sequence. The diameter of the roller body 1 of the upper roller is larger than that of the roller body 1 of the middle roller, and the diameter of the roller body 1 of the middle roller is larger than that of the roller body 1 of the lower roller. The axes of the upper roller, the middle roller and the lower roller are distributed in parallel. The axes of the roll body 1, the bearing mounting part 3, the connecting part 4 and the transmission part 5 are located on the same straight line. The roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are of an integrated structure, namely, the roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are all made of the same material, and the roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are of an integrated structure. The roller body 1, the bearing mounting part 3 and the connecting part 4 are all of a cylindrical structure. The transmission part 5 adopts a flat square transmission part.
The nodular cast iron rough roller can pass through the mass point and the solid solution strengthening effect of the NbC compound, the NbC has extremely high microhardness and high wear resistance, and the NbC is uniformly distributed in a microstructure and can reduce the hardness drop of the roller. The niobium action makes the micro-crystalline structure refined, and increases the tensile strength of the roller, and improves the impact toughness and the heat crack resistance, thereby prolonging the service life of the rough roller. The specific production process comprises the following steps:
firstly, chemical components are optimized, niobium is added to refine a matrix structure, and hardness, wear resistance, toughness and thermal cracking resistance of the roller are improved.
And secondly, when the molten iron is smelted and the temperature of the molten iron is 1320-1350 ℃, 2-30 kg of yttrium-based heavy rare earth molten iron modifier is added per ton, and the active elements in the heavy rare earth are utilized to eliminate impurity elements and purify the molten iron.
And thirdly, optimizing a nodular treatment and inoculation method to promote niobium to form a replacement solidification solution in the crystallization process, so that the crystal lattice of ferrite is distorted, intergranular slippage is hindered, the high-temperature hardness of the ductile iron roller is improved, and the wear resistance is further improved. 1.80 percent of rare earth magnesium, 0.20-0.30 percent of CaSi0, 65 percent of molten iron in the first step, 1360-1380 ℃ of tapping temperature, and adding 75Si-Fe for inoculation after the treatment is finished, so as to increase 0.60 percent of Si content; and in the second step, 35% of iron is added, 0.10-0.30% of BaCa inoculant is added after the iron is taken out for continuous inoculation, the mixture is stirred for 0.30-1 minute by a stirrer, the mixture is uniformly stirred, slag is removed and the mixture is kept still for 2-3 minutes for pouring, and the pouring temperature is 1260-1270 ℃.
Fourthly, the hardness of the roll surface of the roll is 50-55 HSD, and the hardness of the roll neck is
38HSD, roll tensile
480Mpa, a roller metallographic structure, spherical graphite, NbC fine granular carbide and pearlite.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A nodular cast iron roughing roll is characterized in that: the roller is provided with an upper roller, a middle roller and a lower roller which are sequentially distributed from top to bottom, the roller is provided with a roller body (1) made of niobium-added nodular cast iron, two ends of the roller body (1) are respectively provided with a bearing installation part (3) made of niobium-added nodular cast iron, a fillet (2) is arranged at the joint of the roller body (1) and the bearing installation part (3), the left end of the bearing installation part (3) on the left side is provided with a connecting part (4) made of niobium-added nodular cast iron, the right end of the bearing installation part (3) on the right side is provided with a transmission part (5) made of niobium-added nodular cast iron, two passes (6), three passes (7) and four passes (8) are arranged in the length direction of the upper roller, and one pass (9) and four passes (8) are arranged in the length direction of the middle roller, The lower roll is provided with a two-pass (6), a three-pass (7) and a four-pass (8), and a one-pass (9), a three-pass (7) and a five-pass (10) are arranged along the length direction of the lower roll.
2. A nodular cast iron roughing roll according to claim 1 characterized in that: the first hole type (9), the second hole type (6), the third hole type (7), the fourth hole type (8) and the fifth hole type (10) are sequentially distributed from left to right.
3. A nodular cast iron roughing roll according to claim 1 characterized in that: the diameter of the roller body (1) of the upper roller is larger than that of the roller body (1) of the middle roller, and the diameter of the roller body (1) of the middle roller is larger than that of the roller body (1) of the lower roller.
4. A nodular cast iron roughing roll according to claim 1 characterized in that: the axial line of the upper roller, the axial line of the middle roller and the axial line of the lower roller are distributed in parallel.
5. A nodular cast iron roughing roll according to claim 1 characterized in that: the axis of the roller body (1), the axis of the bearing installation part (3), the axis of the connecting part (4) and the axis of the transmission part (5) are positioned on the same straight line.
6. A nodular cast iron roughing roll according to claim 1 characterized in that: the roller body (1), the bearing installation part (3), the connecting part (4) and the transmission part (5) are of an integrated structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021358451.XU CN213001816U (en) | 2020-07-10 | 2020-07-10 | Nodular cast iron roughing roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021358451.XU CN213001816U (en) | 2020-07-10 | 2020-07-10 | Nodular cast iron roughing roll |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213001816U true CN213001816U (en) | 2021-04-20 |
Family
ID=75501786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021358451.XU Active CN213001816U (en) | 2020-07-10 | 2020-07-10 | Nodular cast iron roughing roll |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213001816U (en) |
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2020
- 2020-07-10 CN CN202021358451.XU patent/CN213001816U/en active Active
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