CN111940997B - Modification method for hole pattern of forged semi-steel roller - Google Patents
Modification method for hole pattern of forged semi-steel roller Download PDFInfo
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- CN111940997B CN111940997B CN201910403002.8A CN201910403002A CN111940997B CN 111940997 B CN111940997 B CN 111940997B CN 201910403002 A CN201910403002 A CN 201910403002A CN 111940997 B CN111940997 B CN 111940997B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a method for modifying a hole pattern of a forged semi-steel roller, which comprises the following steps: firstly, roughly machining the surface to be modified of an original hole pattern of a forged semi-steel roller to remove a fatigue layer; step two, the forged semi-steel roller is sent into a heating furnace for preheating, heated to 560 ℃ at the rate of 30 ℃/hour, kept for 8 hours, and then cooled to 350 ℃ at the rate of 30 ℃/hour; thirdly, surfacing the surface to be modified after rough machining, namely surfacing a first priming layer firstly, and then surfacing a second priming layer on the surface of the first priming layer; fourthly, overlaying a working layer on the surface of the second priming coat; step five, after the overlaying welding of the working layer is finished, the heating furnace is closed, the temperature is increased to 520 ℃ according to 30 ℃/hour, the temperature is kept for 8 hours, and then the temperature is reduced to the normal temperature according to 30 ℃/hour; and step six, performing finish machining on the surfacing welded working layer to the design size of a target hole pattern. The method for modifying the hole pattern of the forged semi-steel roller saves the cost.
Description
Technical Field
The invention relates to the technical field of a caliber of a forged semi-steel roller, in particular to a caliber modification method of a forged semi-steel roller.
Background
The rollers of the existing round bar production line are all provided with hole patterns, and rectangular or square blanks are rolled into finished products of round bars, small square blanks and the like through the hole patterns. If the rolling pass series is changed, the roll with the opened pass can not be used, and a new roll opening form needs to be purchased again, which causes great waste.
Disclosure of Invention
In order to solve the problems, the invention provides a method for modifying the pass of a forged semi-steel roller, which saves the cost.
In order to achieve the above object, the present invention provides a method for modifying a pass of a forged semi-steel roll, which is used for modifying an original pass of the forged semi-steel roll into a target pass, and comprises the following steps:
firstly, roughly machining the surface to be modified of an original hole pattern of a forged semi-steel roller to remove a fatigue layer;
step two, the forged semi-steel roller is sent into a heating furnace for preheating, heated to 560 ℃ at the rate of 30 ℃/hour, kept for 8 hours, and then cooled to 350 ℃ at the rate of 30 ℃/hour;
surfacing the surface to be modified after rough machining, namely surfacing a first priming layer firstly, and then surfacing a second priming layer on the surface of the first priming layer, wherein the first priming layer and the second priming layer are made of low-carbon stainless steel materials;
fourthly, overlaying a working layer on the surface of the second priming coat, wherein the working layer is made of alloy materials;
step five, after the overlaying welding of the working layer is finished, the heating furnace is closed, the temperature is increased to 520 ℃ according to 30 ℃/hour, the temperature is kept for 8 hours, and then the temperature is reduced to the normal temperature according to 30 ℃/hour;
and step six, performing finish machining on the surfacing welded working layer to the design size of a target hole pattern.
Preferably, the low-carbon stainless steel material in the third step comprises the following components in percentage by weight: c: 0.06-0.08%, Mn: 6.5-7.5%, Si: 0.4-0.5%, Cr: 13.0 to 15.0%, Ni: 8.0-10.0%, Mo: 0.2-0.3%, S: 0.01-0.02%, P: 0.01-0.02%, Fe: and (4) the balance.
Preferably, the alloy material in the fourth step comprises, by weight: c: 0.08-0.12%, Cr: 12.0-13.0%, Mn: 0.8-1.0%, Mo: 1.0-1.2%, Ni: 4.5-5.5%, Si: 0.4-0.5%, P: 0.01-0.02%, Fe: and (4) the balance.
Preferably, in step four the surfacing working layer of second bottoming layer, when the thickness of first bottoming layer, second bottoming layer and working layer adds when exceeding 20mm, seals the heating furnace, heats to 520 ℃ according to 30 ℃/hour to keep warm for 6 hours, then opens after cooling to 350 ℃ according to 30 ℃/hour the heating furnace continues the surfacing working layer.
Preferably, the minimum value of the target hole pattern to the original hole pattern is 20-30 mm.
The method for modifying the hole pattern of the forged semi-steel roller saves the cost of repurchasing a new roller hole pattern.
Drawings
FIG. 1 is a flow chart of a method of roll pass modification of forged semi-steel in accordance with the present invention;
FIG. 2 is a schematic view of one embodiment of a modified pass of a forged semisteel roll.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings.
As shown in FIG. 1, the method for modifying the pass of a forged semi-steel roll of the present invention for modifying the original pass of the forged semi-steel roll into the target pass comprises the following steps:
firstly, rough machining is carried out on the surface to be modified of the original hole pattern of the forged semi-steel roller, and a fatigue layer is removed.
The surface of the steel sheet was roughly processed to remove all the cracks, and defects were detected by dye penetrant inspection and ultrasonic inspection until they were no longer detected.
And step two, the forged semi-steel roller is sent into a heating furnace for preheating, heated to 560 ℃ at the rate of 30 ℃/hour, kept for 8 hours, and then cooled to 350 ℃ at the rate of 30 ℃/hour.
The stress of the roller in the using process is removed by carrying out heat treatment in a heating furnace.
And thirdly, surfacing the surface to be modified after rough machining, surfacing a first bottom layer firstly, and surfacing a second bottom layer on the surface of the first bottom layer, wherein the first bottom layer and the second bottom layer are made of low-carbon stainless steel materials.
The low-carbon stainless steel material comprises the following components in percentage by weight: c: 0.06-0.08%, Mn: 6.5-7.5%, Si: 0.4-0.5%, Cr: 13.0-15.0%, Ni: 8.0-10.0%, Mo: 0.2-0.3%, S: 0.01-0.02%, P: 0.01-0.02%, Fe: and (4) the balance. Submerged arc welding is adopted for surfacing, the current is 420-450A, the voltage is 30V, and the surfacing linear speed is 450-500 mm/min.
Fourthly, overlaying a working layer on the surface of the second priming coat, wherein the working layer is made of alloy materials.
The alloy material comprises the following components in percentage by weight: c: 0.08-0.12%, Cr: 12.0-13.0%, Mn: 0.8 to 1.0%, Mo: 1.0-1.2%, Ni: 4.5-5.5%, Si: 0.4-0.5%, P: 0.01-0.02%, Fe: and (4) the balance. Submerged arc welding is adopted for surfacing, the surfacing linear speed is 400-420 mm/min, the current is 420-450A, and the voltage is 30V.
As a preferred embodiment of the present invention, a working layer is deposited on the surface of the second primer layer, and when the sum of the thicknesses of the first primer layer, the second primer layer and the working layer exceeds 20mm, the heating furnace is closed, heated to 520 ℃ at 30 ℃/hr, kept at the temperature for 6 hours, then cooled to 350 ℃ at 30 ℃/hr, and opened to continue depositing the working layer.
And step five, after the overlaying welding of the working layer is finished, sealing the heating furnace, heating to 520 ℃ at the speed of 30 ℃/hour, preserving heat for 8 hours, and then cooling to normal temperature at the speed of 30 ℃/hour.
And step six, performing finish machining on the surfacing welded working layer to the design size of a target hole pattern.
Finally, ultrasonic flaw detection and surface wave flaw detection are carried out, and the machine can be used after the flaw detection is qualified.
The forged semi-steel roll has a relatively high carbon content, typically between 1.4% and 2.0%. The matrix structure of the forged semisteel mainly comprises coarse secondary cementite and lamellar pearlite. Because the carbon content is high, the defects of cracks and the like are easy to generate in the common surfacing process, and the follow-up use is easy to lose efficacy. By adopting the method for modifying the hole pattern of the forged semi-steel roller, the defects that cracks are easy to generate in the surfacing process and the like can be avoided.
By adopting the method for modifying the hole pattern of the forged semi-steel roller, the modified size data of the target hole pattern and the original hole pattern are reasonably matched, and the proper target hole pattern is selected, wherein the minimum value of the target hole pattern to the original hole pattern is 20-30 mm.
FIG. 2 is a schematic view showing an example of a modified pass of a forged semi-steel roll, in which the original pass of the forged semi-steel roll 10 is three rhombus holes, which can be modified into a circular pass 11 because modified rhombus holes cannot be used.
As described above, exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings. It should be understood that the invention is not intended to be limited to these specific details. Equivalent or similar changes in the structure and features of the exemplary embodiments may be made without departing from the spirit and scope of the invention, which shall also fall within the scope of protection defined by the claims appended hereto.
Claims (4)
1. A forging semi-steel roll pass modification method is used for modifying an original pass of a forging semi-steel roll into a target pass, and is characterized by comprising the following steps:
firstly, roughly machining the surface to be modified of an original hole pattern of a forged semi-steel roller to remove a fatigue layer;
step two, the forged semi-steel roller is sent into a heating furnace for preheating, heated to 560 ℃ at the rate of 30 ℃/hour, kept for 8 hours, and then cooled to 350 ℃ at the rate of 30 ℃/hour;
surfacing the surface to be modified after rough machining, namely surfacing a first priming layer firstly, and then surfacing a second priming layer on the surface of the first priming layer, wherein the first priming layer and the second priming layer are made of low-carbon stainless steel materials;
fourthly, overlaying a working layer on the surface of the second priming coat, wherein the working layer is made of alloy materials; it includes: when the sum of the thicknesses of the first priming layer, the second priming layer and the working layer exceeds 20mm, closing the heating furnace, heating to 520 ℃ at the speed of 30 ℃/h, preserving heat for 6 hours, cooling to 350 ℃ at the speed of 30 ℃/h, opening the heating furnace, and continuing to weld the working layer;
step five, after the overlaying welding of the working layer is finished, the heating furnace is closed, the temperature is increased to 520 ℃ according to 30 ℃/hour, the temperature is kept for 8 hours, and then the temperature is reduced to the normal temperature according to 30 ℃/hour;
and step six, performing finish machining on the surfacing welded working layer to the design size of a target hole pattern.
2. The method for modifying the pass of a forged semi-steel roll according to claim 1, wherein the low carbon stainless steel material in step three comprises, in weight percent: c: 0.06-0.08%, Mn: 6.5-7.5%, Si: 0.4-0.5%, Cr: 13.0-15.0%, Ni: 8.0-10.0%, Mo: 0.2-0.3%, S: 0.01-0.02%, P: 0.01-0.02%, Fe: and the balance.
3. The forging semisteel roll pass modification method as claimed in claim 1, wherein the alloy material in the fourth step comprises, in weight percent: c: 0.08-0.12%, Cr: 12.0-13.0%, Mn: 0.8-1.0%, Mo: 1.0-1.2%, Ni: 4.5-5.5%, Si: 0.4-0.5%, P: 0.01-0.02%, Fe: and (4) the balance.
4. The method for modifying a roll pass of a forged semi-steel roll according to claim 1, wherein the minimum value of the target pass distance from the original pass is 20 to 30 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910403002.8A CN111940997B (en) | 2019-05-15 | 2019-05-15 | Modification method for hole pattern of forged semi-steel roller |
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| CN201910403002.8A CN111940997B (en) | 2019-05-15 | 2019-05-15 | Modification method for hole pattern of forged semi-steel roller |
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| CN111940997A CN111940997A (en) | 2020-11-17 |
| CN111940997B true CN111940997B (en) | 2022-07-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63252676A (en) * | 1987-04-08 | 1988-10-19 | Ube Ind Ltd | Mechanical parts having excellent rolling fatigue characteristic and its production |
| CN101003104A (en) * | 2006-09-22 | 2007-07-25 | 攀钢集团钢城企业总公司协力公司 | Built up welding technique of restoring roller for shape bar |
| CN105921674A (en) * | 2016-05-25 | 2016-09-07 | 大连交通大学 | Rolling/forging method for producing bimetallic composite turnout sliding bed bedplate |
| CN106624447A (en) * | 2016-12-27 | 2017-05-10 | 秦皇岛鸿翔焊业有限公司 | Flux-cored wire for overlaying repair remanufacturing of two intermediate rollers of Sendzimir mill and manufacturing method thereof |
| CN109423581A (en) * | 2017-09-05 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of two intermediate calender rolls and its manufacturing method of sendzimir mill |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105290703B (en) * | 2015-11-04 | 2018-03-09 | 北京工业大学 | A kind of method that hot roll is worn with submerged arc overlay welding and laser melting coating reparation |
| MX2018009701A (en) * | 2016-02-15 | 2019-01-24 | Novelis Inc | Method for improving quality of aluminum resistance spot welding. |
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2019
- 2019-05-15 CN CN201910403002.8A patent/CN111940997B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63252676A (en) * | 1987-04-08 | 1988-10-19 | Ube Ind Ltd | Mechanical parts having excellent rolling fatigue characteristic and its production |
| CN101003104A (en) * | 2006-09-22 | 2007-07-25 | 攀钢集团钢城企业总公司协力公司 | Built up welding technique of restoring roller for shape bar |
| CN105921674A (en) * | 2016-05-25 | 2016-09-07 | 大连交通大学 | Rolling/forging method for producing bimetallic composite turnout sliding bed bedplate |
| CN106624447A (en) * | 2016-12-27 | 2017-05-10 | 秦皇岛鸿翔焊业有限公司 | Flux-cored wire for overlaying repair remanufacturing of two intermediate rollers of Sendzimir mill and manufacturing method thereof |
| CN109423581A (en) * | 2017-09-05 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of two intermediate calender rolls and its manufacturing method of sendzimir mill |
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| CN111940997A (en) | 2020-11-17 |
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