CN105414888A - Base manufacture technology of four-high mill - Google Patents
Base manufacture technology of four-high mill Download PDFInfo
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- CN105414888A CN105414888A CN201510805425.4A CN201510805425A CN105414888A CN 105414888 A CN105414888 A CN 105414888A CN 201510805425 A CN201510805425 A CN 201510805425A CN 105414888 A CN105414888 A CN 105414888A
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- base
- steel
- annealing
- high mill
- welding
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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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to the field of base manufacture, in particular to a base manufacture technology of a four-high mill. The base manufacture technology comprises the following technical steps: using Cr steel as a material; carrying out annealing treatment on the Cr steel used; machining the Cr steel; carrying out stress relieving annealing thermal treatment on the Cr steel subjected to machining; adopting friction stir welding to carry out welding molding on the Cr steel so as to obtain a base; carrying out homogenizing annealing treatment on the base obtained through welding, and after the base is cooled with the furnace, carrying out full annealing treatment again; carrying out surface strengthening treatment, that is sequentially carrying out shot blasting treatment and surface carburizing treatment on the base obtained; and coating the surface, subjected to surface strengthening treatment, of the base with anti-rust oil and a finish paint. The whole base produced has tenacity, but the surface has high hardness, so that in the application process of the base, even if the surface of the base cracks, the base is still full, and the influence of the brittle failure of the base on the mill is avoided.
Description
Technical field
The invention belongs to base and manufacture field, be specially a kind of footmaker's skill of four-high mill.
Background technology
Milling train is the equipment realizing metal rolled process.The Zhuan Bei ﹐ having made a general reference stocking production overall process includes Zhu and wants She Bei ﹑ Fu to help She Bei ﹑ handling equipment and auxiliary device etc.Floor installation ﹐ frame Shang Ji Jia is mainly fixed on ground by milling train in installation process.The gravity and the Li Ju ﹐ that tumbles that bear working stand guarantee the precision of working stand installation dimension simultaneously.And support can be subject to vertical impact forces in the milling train course of work, after work certain hour, support can produce local fracture, the former mill stand of the Wuhan Iron and Steel Plant Hanyang steel mill as described in document 1, and then whole rolling mill assembly all will be affected.And how to improve the hardness of support and toughness makes support that direct fracture not occur, there is no good process means at present.
Document 1 " improvement of 500mm three-high mill support ", steel rolling, 1996.4:46-47.
Summary of the invention
The invention provides a kind of footmaker's skill of four-high mill equipment, its base entirety of producing possesses toughness but surface possesses higher hardness, makes base in application process, even if crackle appears in susceptor surface, base or complete, avoids the brittle failure of base to impact milling train.
The concrete technical scheme adopted for solving the problems of the technologies described above the present invention is that a kind of footmaker's skill of four-high mill equipment, comprises following processing step:
A selection, selects Cr steel to be prepared base;
B preliminary working, carries out annealing in process to the Cr steel selected, and the temperature range of described annealing in process is: 750-800 DEG C, insulation 2-4h, and cooling velocity is 60-70 DEG C/h;
C carries out machining to Cr steel, completes the hole needed for four-high mill installation and groove;
D carries out stress relief annealing heat treatment to the Cr steel completing machining, and the temperature range of described annealing in process is: 650-850 DEG C, insulation 4h, and cooling velocity is 20-30 DEG C/h;
E welds, and adopt friction stir welding to carry out welding fabrication to Cr steel and obtain base, wherein, mixing a speed is 800r/min, and speed of welding is 60-300mm/min;
F subsequent heat treatment, carry out homogenizing annealing process to welding the base obtained, temperature is 1000-1100 DEG C, insulation 12-14h, and base with after stove cooling, then carries out full annealing process;
G surface Hardening Treatment, again carries out case-carbonizing process after carrying out bead to the base obtained; The technological parameter of described bead is for selecting 90-130 object shot-peening, and shot peening velocity is 100m/s; Described case-carbonizing is treated to the technique after by bead and puts into the graphite that temperature is 300-900 DEG C, insulation 1-5h, then room temperature cooling;
The susceptor surface of h after surface Hardening Treatment applies antirust oil and finish paint.
Wherein, described machining is milling machine processing.
Wherein, machining adopts Digit Control Machine Tool, ensures that manufacturing tolerance scope is ± 0.1mm.
Wherein, the material of described shot-peening is cast steel ball or cast iron pellets.
Wherein, described finish paint is anticorrosion antiwear paint.
Wherein, the thickness of the carburized layer of described case-carbonizing process is 2-2.5mm.
Beneficial effect of the present invention
Adopt Cr steel to carry out annealing in process, stress relief annealing and full annealing process respectively, make Cr steel possess good toughness before carrying out machining; Carry out stress relief annealing after mechanical machining is complete and ensure that Cr steel does not exist stress when welding and concentrates situation, ensure that the quality of welding obtains the quality of base with processing; Finally also carry out full annealing process, reduce the impact of welding on the Structure and Properties of base, improve the homogeneity of tissue, avoid the Local Brittle Fracture of base.
Finally also carry out Carburization Treatment, the main intensity improving susceptor surface, to avoid in the four-high mill course of work up-down vibration to the fretting wear of base.
Detailed description of the invention
In order to better explain technical scheme of the present invention, be described in detail below in conjunction with embodiment.
Embodiment
Footmaker's skill of four-high mill equipment, comprises following processing step:
Cr steel is selected to be prepared base; Annealing in process is carried out to the Cr steel selected, the temperature range of described annealing in process is: 750-800 DEG C, insulation 2-4h, cooling velocity is 60-70 DEG C/h, by towing back to process, the stress of the existence of Cr steel in process of manufacture is eliminated, coarse grain reassembles into little crystal grain, and the stress both having eliminated the existence of Cr steel also puies forward the toughness of the entirety of high Cr steel, be convenient to follow-up milling machine processing, be also conducive to improving the toughness that processing obtains base; Milling machine processing is carried out to Cr steel, completes the hole needed for four-high mill installation and groove; In milling machine process, have the mode of pure physics to obtain hole and groove make Cr steel Working position have more stress to concentrate; Therefore, need the Cr steel to completing milling machine processing to carry out stress relief annealing heat treatment, the temperature range of described annealing in process is: 650-850 DEG C, insulation 4h, and cooling velocity is 20-30 DEG C/h; Welding, adopt friction stir welding to carry out welding fabrication to Cr steel and obtain base, wherein, mixing a speed is 800r/min, and speed of welding is 60-300mm/min; Agitating friction is adopted to be welded in welding process, mixing needle stretches in the seam of base while rotation, frictional heat between Stirring head (mainly the shaft shoulder) and base, make the material generation intense plastic strain before soldering tip, then along with the movement of soldering tip, the material of superplasticity's distortion is deposited on the behind of stirring-head gradually, thus forms stir friction welding seam, the plastic deformation ability of weld seam hands over fusion weld strong, processes the good toughness of base in weld zone obtained; Subsequent heat treatment, carry out homogenizing annealing process to welding the base obtained, temperature is 1000-1100 DEG C, insulation 12-14h, and base with after stove cooling, then carries out full annealing process; Realize the residual stress existed when eliminating welding base, and make the microstructure homogenization of base; In order to ensure that base operationally by fretting wear easily, also can not will carry out surface Hardening Treatment to the base after welding, be specially after carrying out bead to the base obtained and carry out case-carbonizing process again on surface; The technological parameter of described bead is for selecting 90-130 object shot-peening, and shot peening velocity is 100m/s, and first shot-peening one eliminates base to add the burr remained man-hour, and two is the impact strengths improving surface; Then carry out the carburized layer that there is 2-2.5.mm that case-carbonizing process makes susceptor surface, change the constituent of susceptor surface material, also improve surface strength and do not affect the toughness of base entirety; Described case-carbonizing is treated to the technique after by bead and puts into the graphite that temperature is 300-900 DEG C, insulation 1-5h, then room temperature cooling; Susceptor surface coating antirust oil after surface Hardening Treatment and finish paint.
In order to improve the accuracy of the size in hole that base processes and groove, described machining adopts Digit Control Machine Tool, ensures that manufacturing tolerance scope is ± 0.1mm.
In order to improve susceptor surface intensity in shot-peening process, the material of described shot-peening is cast steel ball or cast iron pellets.
In order to the aesthetic property of base, described finish paint is anticorrosion antiwear paint.
Should be understood that, above-mentioned detailed description of the invention of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (6)
1. footmaker's skill of four-high mill equipment, is characterized in that, comprises following processing step:
A selection, selects Cr steel to be prepared base;
B preliminary working, carries out annealing in process to the Cr steel selected, and the temperature range of described annealing in process is: 750-800 DEG C, insulation 2-4h, and cooling velocity is 60-70 DEG C/h;
C carries out machining to Cr steel, completes the hole needed for four-high mill installation and groove;
D carries out stress relief annealing heat treatment to the Cr steel completing machining, and the temperature range of described annealing in process is: 650-850 DEG C, insulation 4h, and cooling velocity is 20-30 DEG C/h;
E welds, and adopt friction stir welding to carry out welding fabrication to Cr steel and obtain base, wherein, mixing a speed is 800r/min, and speed of welding is 60-300mm/min;
F subsequent heat treatment, carry out homogenizing annealing process to welding the base obtained, temperature is 1000-1100 DEG C, insulation 12-14h, and base with after stove cooling, then carries out full annealing process;
G surface Hardening Treatment, again carries out case-carbonizing process after carrying out bead to the base obtained; The technological parameter of described bead is for selecting 90-130 object shot-peening, and shot peening velocity is 100m/s; Described case-carbonizing is treated to the technique after by bead and puts into the graphite that temperature is 300-900 DEG C, insulation 1-5h, then room temperature cooling;
The susceptor surface of h after surface Hardening Treatment applies antirust oil and finish paint.
2. footmaker's skill of a kind of four-high mill equipment according to claim 1, is characterized in that, described machining is milling machine processing.
3. footmaker's skill of a kind of four-high mill equipment according to claim 1 and 2, is characterized in that, machining adopts Digit Control Machine Tool, ensures that manufacturing tolerance scope is ± 0.1mm.
4. footmaker's skill of a kind of four-high mill equipment according to claim 1, is characterized in that, the material of described shot-peening is cast steel ball or cast iron pellets.
5. footmaker's skill of a kind of four-high mill equipment according to claim 1, is characterized in that, described finish paint is anticorrosion antiwear paint.
6. footmaker's skill of a kind of four-high mill equipment according to claim 1, is characterized in that, the thickness of the carburized layer of described case-carbonizing process is 2-2.5mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805425.4A CN105414888B (en) | 2015-11-20 | 2015-11-20 | A kind of footmaker skill of four-high mill |
| PCT/CN2015/097369 WO2017084136A1 (en) | 2015-11-20 | 2015-12-15 | Base manufacturing process of four-high mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510805425.4A CN105414888B (en) | 2015-11-20 | 2015-11-20 | A kind of footmaker skill of four-high mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105414888A true CN105414888A (en) | 2016-03-23 |
| CN105414888B CN105414888B (en) | 2017-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510805425.4A Active CN105414888B (en) | 2015-11-20 | 2015-11-20 | A kind of footmaker skill of four-high mill |
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| CN (1) | CN105414888B (en) |
| WO (1) | WO2017084136A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020455A (en) * | 2019-12-16 | 2020-04-17 | 武汉理工大学 | Sub-temperature carburizing heat treatment method for reducing heat treatment deformation of thin-wall gear |
Citations (5)
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| CN201249134Y (en) * | 2008-07-17 | 2009-06-03 | 浙江同力重型机械制造有限公司 | Main reducer base for a vertical mill |
| CN103659184A (en) * | 2013-12-05 | 2014-03-26 | 湖北三江航天红阳机电有限公司 | Method for welding heat dissipation base plates |
| DE102013006359A1 (en) * | 2013-04-12 | 2014-03-27 | Daimler Ag | Pressing tool useful for machining of sheets, preferably metal sheets comprises base body and functional area, which is constructed and arranged such that it is partially directly engages with metal sheet to be processed during machining |
| CN103770046A (en) * | 2012-10-18 | 2014-05-07 | 长沙市天映机械制造有限公司 | High accuracy frame for aircraft assembling tool and machining method thereof |
| CN104674120A (en) * | 2015-03-19 | 2015-06-03 | 柳州市永益机械制造有限公司 | Housing of rolling mill and method for casting housing of rolling mill |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855109A (en) * | 1981-09-28 | 1983-04-01 | Mitsubishi Heavy Ind Ltd | Supporting base for backup roll |
| CN1278791C (en) * | 2003-11-21 | 2006-10-11 | 宝山钢铁股份有限公司 | Mill frame lining board, and its mfg. method |
| CN101077557A (en) * | 2006-05-22 | 2007-11-28 | 山崎马扎克公司 | Process for manufactruing machine tool column support and subbase and structural part |
| KR100777673B1 (en) * | 2007-02-15 | 2007-11-21 | 한국중기공업 주식회사 | Work roll chock, manufacturing method thereof and rolling mill |
| CN101456039A (en) * | 2007-12-12 | 2009-06-17 | 中国二十冶建设有限公司 | Rolling-mill base installation measurement method |
-
2015
- 2015-11-20 CN CN201510805425.4A patent/CN105414888B/en active Active
- 2015-12-15 WO PCT/CN2015/097369 patent/WO2017084136A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201249134Y (en) * | 2008-07-17 | 2009-06-03 | 浙江同力重型机械制造有限公司 | Main reducer base for a vertical mill |
| CN103770046A (en) * | 2012-10-18 | 2014-05-07 | 长沙市天映机械制造有限公司 | High accuracy frame for aircraft assembling tool and machining method thereof |
| DE102013006359A1 (en) * | 2013-04-12 | 2014-03-27 | Daimler Ag | Pressing tool useful for machining of sheets, preferably metal sheets comprises base body and functional area, which is constructed and arranged such that it is partially directly engages with metal sheet to be processed during machining |
| CN103659184A (en) * | 2013-12-05 | 2014-03-26 | 湖北三江航天红阳机电有限公司 | Method for welding heat dissipation base plates |
| CN104674120A (en) * | 2015-03-19 | 2015-06-03 | 柳州市永益机械制造有限公司 | Housing of rolling mill and method for casting housing of rolling mill |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020455A (en) * | 2019-12-16 | 2020-04-17 | 武汉理工大学 | Sub-temperature carburizing heat treatment method for reducing heat treatment deformation of thin-wall gear |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017084136A1 (en) | 2017-05-26 |
| CN105414888B (en) | 2017-10-03 |
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