CN216655788U - Improved chromium alloy roller special for rolling turbine stator blade finished products - Google Patents
Improved chromium alloy roller special for rolling turbine stator blade finished products Download PDFInfo
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- CN216655788U CN216655788U CN202123254005.1U CN202123254005U CN216655788U CN 216655788 U CN216655788 U CN 216655788U CN 202123254005 U CN202123254005 U CN 202123254005U CN 216655788 U CN216655788 U CN 216655788U
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Abstract
The utility model relates to the technical field of rollers, in particular to an improved chromium alloy roller special for rolling turbine stator blade finished products, which is provided with an upper roller and a lower roller which are arranged in parallel up and down, wherein both ends of the upper roller and both ends of the lower roller are provided with bearing blocks, and one side of each bearing block is provided with a transmission end; the upper roll is provided with an arc-shaped open slot; the lower roller is provided with an arc-shaped bulge at a position corresponding to the arc-shaped opening groove; the arc-shaped open slot and the arc-shaped bulge are spliced to form the section shape of the stationary blade. The improved chromium alloy roller special for rolling the turbine stator blade finished product has the advantages of high hardness, good toughness, high heat crack resistance, high strength and good comprehensive mechanical property, and can greatly prolong the rolling service life of the roller, thereby improving the integral rolling yield; the whole rolling precision and the rolling efficiency of the stator blade are guaranteed, and the stator blade is convenient to widely popularize and use.
Description
Technical Field
The utility model relates to the technical field of rollers, in particular to an improved chromium alloy roller special for rolling turbine stator blade finished products.
Background
The stator blade is used as a stator blade of a steam turbine and is in contact with high-temperature, high-pressure, high-speed and humid gas for a long time in operation. In order to accommodate such a working environment, the stationary blades must have good high temperature strength and corrosion resistance. Therefore, the stainless steel 1Cr13 with high rigidity, high toughness, high strength and corrosion resistance is generally adopted at home and abroad as a material, and the stainless steel has good mechanical property and can resist the corrosion of moist gas. The stator blade is used as stator blade part of steam turbine, because of the characteristics of the rolled piece material, the deformation resistance of the rolled piece is larger when the rolled piece is rolled on a rolling mill, when the processing temperature is lower, the deformation resistance is increased quickly, the plasticity is lower, in order to obtain good mechanical property, only a larger compression ratio process can be adopted, and the maximum allowable rolling reduction is smaller than that of other steel types, in order to obtain better compression ratio, only the rolling pass of the rolling mill can be increased. The surface requirement of the stationary blade is high, the utilization rate of the material reaches 60% in a hot rolling state, and the material utilization rate can reach more than 90% by performing proper cold rolling processing after hot rolling.
The end surface shape of the static blade is more complicated, in order to reduce the gas flow resistance and meet the requirements of hydrodynamics, the section contour line of the static blade consists of smooth curves, an arc line on the upper surface is called a back arc, an arc line on the lower surface is called a bottom arc, and another important characteristic of the section shape of the static blade is asymmetrical, particularly the thickness along the width direction is extremely uneven, and the thickness of the left side is much larger than that of the right side; the size difference of the narrow and wide positions is 4.08 times. Such a profile will exhibit large horizontal bending and large axial forces during rolling. Thus, because of the above-mentioned characteristics and factors, the production of stationary blade parts on rolling mills places very strict requirements on the rolls that work in this working environment. The roller needs to have higher hardness to improve the wear resistance, higher toughness to improve the comprehensive properties such as thermal crack resistance, strength and the like, so that the rolling precision and the surface finish of the stator blade can be guaranteed. The traditional material rollers used by the existing rolling mill have poor wear resistance, are easy to crack at times and can also have the phenomena of stripping and block falling when serious.
Disclosure of Invention
The technical problem to be solved by the utility model is as follows: in order to solve the problems in the prior art, the improved chromium alloy roller special for rolling the turbine stator blade finished product is provided, has high hardness, good toughness, high heat cracking resistance, high strength and good comprehensive mechanical property, and can greatly prolong the rolling service life of the roller so as to improve the integral rolling yield; the whole rolling precision and the rolling efficiency of the stator blade are guaranteed, and the stator blade is convenient to widely popularize and use.
The technical scheme adopted by the utility model for solving the technical problem is as follows: the improved chromium alloy roller specially for rolling turbine stator blade product has upper and lower parallel rollers with bearing ends set in two ends of the upper roller and the lower roller and driving end set in one side of the bearing ends; the upper roll is provided with an arc-shaped open slot; an arc-shaped bulge is arranged at the position, opposite to the arc-shaped opening groove, of the lower roller; the arc-shaped open slot and the arc-shaped bulge are spliced to form the section shape of the stationary blade.
Further limiting, in the technical scheme, the connecting parts of the two ends of the upper roller and the bearing blocks are provided with first steps; such a design may enable an efficient transition at the connection.
Further limiting, in the above technical scheme, the joints of the two ends of the lower roller and the bearing stops are provided with second steps; such a design may enable an efficient transition at the connection.
Further limiting, in the above technical scheme, the upper roller, the bearing block and the transmission end are of an integrated structure; the strength of the whole upper roller can be greatly improved.
Further limiting, in the above technical scheme, the lower roller, the arc-shaped protrusion, the bearing stop and the transmission end are of an integrated structure; the strength of the whole lower roller can be greatly improved.
The utility model has the beneficial effects that: the improved chromium alloy roller special for rolling the turbine stator blade finished product has the advantages of high hardness, good toughness, high heat cracking resistance, high strength and good comprehensive mechanical property, and can greatly prolong the rolling service life of the roller, thereby improving the integral rolling yield; the whole rolling precision and the rolling efficiency of the stator blade are guaranteed, and the stator blade rolling device is convenient to widely popularize and use.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or 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 other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
The reference numbers in the figures are: 1. the roller comprises an upper roller body, a lower roller body, a bearing stop, a transmission end, an arc-shaped open slot, an arc-shaped bulge, a first step, a second step and a bearing stop, wherein the upper roller body 2, the lower roller body 3, the bearing stop 4, the transmission end 5, the arc-shaped open slot 6, the arc-shaped bulge 7, the first step and the second step are arranged on the bearing stop.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
As shown in fig. 1, the improved chromium alloy roll special for rolling the steam turbine stationary blade finished product is provided with an upper roll 1 and a lower roll 2 which are arranged in parallel up and down, wherein both ends of the upper roll 1 and both ends of the lower roll 2 are provided with bearing steps 3, and one side of each bearing step 3 is provided with a transmission end 4; an arc-shaped open slot 5 is formed in the upper roller 1; an arc-shaped bulge 6 is arranged at the position of the lower roller 2 opposite to the arc-shaped open slot 5; the arc-shaped open slot 5 and the arc-shaped bulge 6 are spliced to form the section shape of the stationary blade.
Wherein, the junction of the two ends of the upper roller 1 and the bearing retainer 3 is provided with a first step 7. And second steps 8 are arranged at the joints of the two ends of the lower roller 2 and the bearing stop 3. The upper roll 1, the bearing retainer 3 and the transmission end 4 are of an integrated structure. The lower roller 2, the arc-shaped bulge 6, the bearing retainer 3 and the transmission end 4 are of an integrated structure.
The production process of the improved chromium alloy roller special for rolling the turbine stator blade finished product comprises the following steps: chemical components: c: 0.30% -0.60%, Si: 0.30-0.50%, Mn: 0.60-1.00%, Cr 4.00-6.00%, Ni less than or equal to 0.50%, Mo: 0.80% -1.20%, V: 0.30 to 0.50 percent; special heat treatment: diffusion annealing; spheroidizing; normalizing and spray quenching; and (6) tempering.
The application is exclusively used in rolling steam turbine stator blade finished product's improved generation chromium alloy roll's metallographic phase basic structure does: granular carbides, tempered troostite and martensite. The hardness of the surface of the roller is 72-78 HSD, and the hardness from the surface of the roller to the bottom of the groove is less than or equal to 1.5 HSD; the tensile strength of the bearing retainer 3 is more than or equal to 920 MPa.
Compared with the traditional roller, the rolling quantity of the improved chromium alloy roller special for rolling the turbine stator blade finished product can be increased by more than 16.2 percent and can reach 18.6 percent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the scope of the present invention, and the technical solutions and the utility model concepts of the present invention are equivalent to or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a rolling steam turbine stator blade finished product's improved generation chromium alloy roll is exclusively used in which characterized in that: the device is provided with an upper roller and a lower roller which are arranged in parallel up and down, wherein both ends of the upper roller and both ends of the lower roller are provided with bearing blocks, and one side of each bearing block is provided with a transmission end; the upper roll is provided with an arc-shaped open slot; the lower roller is provided with an arc-shaped bulge at a position corresponding to the arc-shaped opening groove; the arc-shaped open slot and the arc-shaped bulge are spliced to form the section shape of the stationary blade.
2. The improved chromium alloy roll special for rolling the finished product of the turbine stationary blade as claimed in claim 1, wherein: and the joints of the two ends of the upper roller and the bearing retainer are provided with first steps.
3. The improved chromium alloy roll special for rolling the finished product of the turbine stationary blade as claimed in claim 1, wherein: and second steps are arranged at the joints of the two ends of the lower roller and the bearing retainer.
4. The improved chromium alloy roll special for rolling the finished product of the turbine stationary blade as claimed in claim 1, wherein: the upper roller, the bearing retainer and the transmission end are of an integrated structure.
5. The improved chromium alloy roll special for rolling the finished product of the turbine stationary blade as claimed in claim 1, wherein: the lower roller, the arc-shaped bulge, the bearing retainer and the transmission end are of an integrated structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123254005.1U CN216655788U (en) | 2021-12-22 | 2021-12-22 | Improved chromium alloy roller special for rolling turbine stator blade finished products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123254005.1U CN216655788U (en) | 2021-12-22 | 2021-12-22 | Improved chromium alloy roller special for rolling turbine stator blade finished products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216655788U true CN216655788U (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123254005.1U Active CN216655788U (en) | 2021-12-22 | 2021-12-22 | Improved chromium alloy roller special for rolling turbine stator blade finished products |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216655788U (en) |
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2021
- 2021-12-22 CN CN202123254005.1U patent/CN216655788U/en active Active
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