CN211570752U - Improved nodular cast iron rail beam finishing roll - Google Patents
Improved nodular cast iron rail beam finishing roll Download PDFInfo
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- CN211570752U CN211570752U CN201921063366.8U CN201921063366U CN211570752U CN 211570752 U CN211570752 U CN 211570752U CN 201921063366 U CN201921063366 U CN 201921063366U CN 211570752 U CN211570752 U CN 211570752U
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Abstract
The utility model relates to the technical field of finishing rolls, in particular to an improved nodular cast iron rail beam finishing roll which is provided with a roll body arranged in a ladder way, wherein the upper end of the roll body is fixed with an upper roll neck, and the lower end of the roll body is fixed with a lower roll neck; the lower end of the lower roller neck is fixed with a transmission end. The improved nodular cast iron rail beam finishing roll and the production method thereof have the advantages that the density and red hardness of the roll are greatly improved, the impact toughness and the thermal crack resistance are high, the hardness fall is reduced, the service life of the roll is prolonged, the production method is simple, the process is reasonable, and the wide popularization and the use are convenient.
Description
Technical Field
The utility model belongs to the technical field of the technique of finishing roll and specifically relates to an improved generation nodular cast iron rail beam finishing roll.
Background
Modern steel rails, such as light rails for mine railways, heavy rails for various freight railways and crane rails for factory cranes, are more and more in variety and more rigorous in precision and rigidity, and pearlitic nodular cast iron materials are mostly adopted for rolling finish rolling stands for rolling such steel rails. The fine roller made of the material has high carbide content and a net shape. When the roller is rolled in a deep hole type, the roller has larger hardness fall, is easy to generate heat cracks, can seriously affect the rolling efficiency and the precision of a rolled piece, and often leads the roller to lose efficacy in advance.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: in order to solve the problems existing in the background technology, the improved nodular cast iron rail beam finishing roll and the production method thereof are provided, the density and red hardness of the roll are greatly improved, the impact toughness and the hot crack resistance are strong, the hardness drop is reduced, the service life of the roll is prolonged, the production method is simple, the process is reasonable, and the wide popularization and the use are convenient.
The utility model provides a technical scheme that its technical problem adopted is: an improved nodular cast iron rail beam finishing roll is provided with a roll body arranged in a ladder way, wherein the upper end of the roll body is fixed with an upper roll neck, and the lower end of the roll body is fixed with a lower roll neck; the lower end of the lower roller neck is fixed with a transmission end.
Further, in the technical scheme, the hardness of the roll body is 65-70 HSD.
Further, in the technical scheme, the hardness fall between the roll body and the upper roll neck and between the roll body and the lower roll neck is less than or equal to 3 HSD.
Further, in the technical scheme, the tensile strength of the roll body, the tensile strength of the upper roll neck and the tensile strength of the lower roll neck are all more than or equal to 480 MPa.
A production method of an improved nodular cast iron rail beam finishing roll comprises the following steps: s1, optimizing and configuring chemical components: c: 3.20-3.40%; si: 1.45-1.65%; mn: 0.55-0.75%; p: less than or equal to 0.03 percent; s: less than or equal to 0.025 percent; cr: 0.75-0.85%; ni: 2.80-3.20%; mo: 0.50-0.60%; v: 0.20 to 0.30 percent; re: 0.05-0.15%; mg: 0.05-0.08%; s2, smelting: controlling the components in the furnace during smelting: si: 1.10-1.20%; p: less than or equal to 0.03 percent; s: less than or equal to 0.025 percent; ni: 2.30-2.40%; the rest is according to the requirements of finished products; controlling the tapping temperature at 1410-1430 ℃ during spheroidization; 7kg/t of NiMg nodulizer and 3-3.5 kg/t of yttrium based heavy rare earth are adopted; CaBa inoculant is adopted in inoculation treatment, and after inoculation of Si3.5 kg/t in a bag, the bag is calmed for 8 minutes; s3, controlling the temperature to be 1290-1300 ℃ during pouring; instantaneous inoculation is carried out during pouring, Si0.5kg/t is added, and the fast pouring is carried out for 5 t/min; and S4, after casting, cooling to normal temperature, and turning to obtain the finished product.
Further, in the above technical solution, the metallographic basic structure of the finished product in S4 is a mixture of spheroidized graphite, fine grained metal carbide, fine pearlite, bainite, and martensite.
The utility model has the advantages that: the utility model provides an improved generation nodular cast iron rail roof beam finishing roll and production method thereof, its roll density and red hard have obtained very big improvement, and impact toughness and hot crack resistance nature are strong, have reduced the hardness drop, have prolonged the life of roll, and its production method is simple, and reasonable in process 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 drawings are: 1. the roller body 2, the upper roller neck 3, the lower roller neck 4 and the transmission end.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows an improved nodular cast iron rail beam finishing roll, which is provided with a roll body 1 arranged in a ladder way, wherein the upper end of the roll body 1 is fixed with an upper roll neck 2, and the lower end of the roll body 1 is fixed with a lower roll neck 3; the lower end of the lower roll neck 3 is fixed with a transmission end 4.
Wherein the hardness of the roller body 1 is 65-70 HSD. The hardness fall between the roll body 1 and the upper roll neck 2 and the lower roll neck 3 is less than or equal to 3 HSD. The tensile strength of the roller body 1, the upper roller neck 2 and the lower roller neck 3 is more than or equal to 480 MPa.
A production method of an improved nodular cast iron rail beam finishing roll comprises the following steps: s1, optimizing and configuring chemical components: c: 3.20-3.40%; si: 1.45-1.65%; mn: 0.55-0.75%; p: less than or equal to 0.03 percent; s: less than or equal to 0.025 percent; cr: 0.75-0.85%; ni: 2.80-3.20%; mo: 0.50-0.60%; v: 0.20 to 0.30 percent; re: 0.05-0.15%; mg: 0.05-0.08%; s2, smelting: controlling the components in the furnace during smelting: si: 1.10-1.20%; p: less than or equal to 0.03 percent; s: less than or equal to 0.025 percent; ni: 2.30-2.40%; the rest is according to the requirements of finished products; controlling the tapping temperature at 1410-1430 ℃ during spheroidization; 7kg/t of NiMg nodulizer and 3-3.5 kg/t of yttrium based heavy rare earth are adopted; CaBa inoculant is adopted in inoculation treatment, and after inoculation of Si3.5 kg/t in a bag, the bag is calmed for 8 minutes; s3, controlling the temperature to be 1290-1300 ℃ during pouring; instantaneous inoculation is carried out during pouring, Si0.5kg/t is added, and the fast pouring is carried out for 5 t/min; and S4, after casting, cooling to normal temperature, and turning to obtain the finished product.
Wherein the finished product metallographic basic structure in S4 is a mixture of spheroidized graphite, fine granular metallic carbide, fine pearlite, bainite and martensite.
The first embodiment is as follows:
a production method of an improved nodular cast iron rail beam finishing roll comprises the following steps: s1, optimizing and configuring chemical components: c: 3.20 percent; si: 1.45 percent; mn: 0.55 percent; p: 0.01 percent; s: 0.01 percent; cr: 0.75 percent; ni: 2.80 percent; mo: 0.50 percent; v: 0.20 percent; re: 0.05 percent; mg: 0.05 percent; s2, smelting: controlling the components in the furnace during smelting: si: 1.10 percent; p: 0.01 percent; s: 0.01 percent; ni: 2.30 percent; the rest is according to the requirements of finished products; controlling the tapping temperature at 1410 ℃ during spheroidization; adopting 7kg/t of NiMg nodulizer and 3kg/t of yttrium based heavy rare earth; CaBa inoculant is adopted in inoculation treatment, and after inoculation of Si3.5 kg/t in a bag, the bag is calmed for 8 minutes; s3, controlling the temperature to 1290 ℃ during pouring; instantaneous inoculation is carried out during pouring, Si0.5kg/t is added, and the fast pouring is carried out for 5 t/min; and S4, cooling to normal temperature after casting, and turning to obtain a finished product I.
Example two: a production method of an improved nodular cast iron rail beam finishing roll comprises the following steps: s1, optimizing and configuring chemical components: c: 3.30 percent; si: 1.55 percent; mn: 0.65 percent; p: 0.02 percent; s: 0.02 percent; cr: 0.80 percent; ni: 3.00 percent; mo: 0.55 percent; v: 0.25 percent; re: 0.10 percent; mg: 0.06 percent; s2, smelting: controlling the components in the furnace during smelting: si: 1.15 percent; p: 0.02 percent; s: 0.02 percent; ni: 2.35 percent; the rest is according to the requirements of finished products; controlling the tapping temperature at 1420 ℃ during spheroidization; adopting 7kg/t of NiMg nodulizer and 3.3kg/t of yttrium based heavy rare earth; CaBa inoculant is adopted in inoculation treatment, and after inoculation of Si3.5 kg/t in a bag, the bag is calmed for 8 minutes; s3, controlling the temperature to 1295 ℃ during pouring; instantaneous inoculation is carried out during pouring, Si0.5kg/t is added, and the fast pouring is carried out for 5 t/min; and S4, cooling to normal temperature after casting, and turning to obtain a finished product II.
Example three:
a production method of an improved nodular cast iron rail beam finishing roll comprises the following steps: s1, optimizing and configuring chemical components: c: 3.40 percent; si: 1.65 percent; mn: 0.75 percent; p: 0.03 percent; s: 0.025 percent; cr: 0.85 percent; ni: 3.20 percent; mo: 0.60 percent; v: 0.30 percent; re: 0.15 percent; mg: 0.08 percent; s2, smelting: controlling the components in the furnace during smelting: si: 1.20 percent; p: 0.03 percent; s: 0.025 percent; ni: 2.40 percent; the rest is according to the requirements of finished products; controlling the tapping temperature at 1430 ℃ during spheroidization; adopting 7kg/t of NiMg nodulizer and 3.5kg/t of yttrium based heavy rare earth; CaBa inoculant is adopted in inoculation treatment, and after inoculation of Si3.5 kg/t in a bag, the bag is calmed for 8 minutes; s3, controlling the temperature at 1300 ℃ during pouring; instantaneous inoculation is carried out during pouring, Si0.5kg/t is added, and the fast pouring is carried out for 5 t/min; and S4, cooling to normal temperature after casting, and turning to obtain a finished product III.
And (3) detecting finished products processed by the production method in the step (3) one by one, wherein the detection data are as follows:
| test items | Finished product one | Product two | Product III |
| Hardness of roll surface (HSD) | 65 | 68 | 66 |
| Drop in Hardness (HSD) | 2.5 | 1.8 | 3 |
| Tensile strength (MPa) | 498 | 565 | 520 |
The above-mentioned, 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 (1)
1. The utility model provides an improved generation nodular cast iron rail roof beam finishing roll which characterized in that: the roll body is provided with a step arrangement, an upper roll neck is fixed at the upper end of the roll body, and a lower roll neck is fixed at the lower end of the roll body; the lower end of the lower roller neck is fixed with a transmission end; the hardness of the roll body is 65-70 HSD; the hardness fall between the roll body and the upper roll neck and between the roll body and the lower roll neck is less than or equal to 3 HSD; the tensile strength of the roll body, the upper roll neck and the lower roll neck is more than or equal to 480 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063366.8U CN211570752U (en) | 2019-07-09 | 2019-07-09 | Improved nodular cast iron rail beam finishing roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063366.8U CN211570752U (en) | 2019-07-09 | 2019-07-09 | Improved nodular cast iron rail beam finishing roll |
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| Publication Number | Publication Date |
|---|---|
| CN211570752U true CN211570752U (en) | 2020-09-25 |
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| CN201921063366.8U Active CN211570752U (en) | 2019-07-09 | 2019-07-09 | Improved nodular cast iron rail beam finishing roll |
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2019
- 2019-07-09 CN CN201921063366.8U patent/CN211570752U/en active Active
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