CN107414326B - A kind of crystallizer foot roll surface overlaying technique and clamping workpiece tooling - Google Patents
A kind of crystallizer foot roll surface overlaying technique and clamping workpiece tooling Download PDFInfo
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- CN107414326B CN107414326B CN201710546846.9A CN201710546846A CN107414326B CN 107414326 B CN107414326 B CN 107414326B CN 201710546846 A CN201710546846 A CN 201710546846A CN 107414326 B CN107414326 B CN 107414326B
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Classifications
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
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- Arc Welding In General (AREA)
Abstract
A kind of crystallizer foot roll surface overlaying technique and clamping workpiece tooling, belong to welding technique field.The crystallizer foot roll surface overlaying technique implements built-up welding operation, including following operative step in workpiece surface with automatic submerged-arc welding method: processing before a, weldering；B, clamping workpiece；C, transition zone is segmented built-up welding；D, workpiece is cooling；E, first pass wearing layer built-up welding；F, second time wearing layer built-up welding；G, post weld heat treatment.The present invention has been achieved the purpose that reduce workpiece bows deformation, has been improved workpiece surface hardness uniformity, improves fatigue resistance after workpiece is repaired by the improvement to existing bead-welding technology and clamping workpiece tooling.
Description
Technical field
The present invention relates to a kind of metal surface bead-welding technology and frock clamp, especially a kind of continuous casting machine crystallizer foot roll table
Surface build-up welding technique and clamping workpiece tooling, belong to welding technique field.
Background technique
Crystallizer is the important component of casting blank formation equipment during continuous casting steel machine, is referred to as " the heart of continuous casting machine
It is dirty ", its function is that the high-temperature molten steel for continuously injecting inner cavity is forced cooling by water-cooled copper wall, its heat is exported,
It is allowed to gradually be solidified as having the slab of required section configuration and shell thickness, and makes this core still and be the slab of liquid
Continuously mouth pulls out under crystallizer, creates conditions for solidification completely in its secondary cooling zone afterwards.Sufficient roller is crystallizer
In important component, positioned at the lower section of conticaster crystallizer, slab temperature is at 800 DEG C or more when due to working condition, foot
The roll surface of roller will receive the effects of high temperature, extruding, abrasion, cavitation erosion, therefore propose to the hardness and strength of sufficient roller roll surface higher
Requirement.
Built-up welding is with electric welding or gas welding method the welding procedure piled up on workpiece after metal molten, and built-up welding is as material table
The modified a kind of economic and quick process in face, is applied to the manufacture and reparation of mechanical machine part more and more widely
In.But when existing bead-welding technology and clamping workpiece tooling being used to carry out the production of above-mentioned crystallizer foot roll, because of the diameter of sufficient roller
Smaller, axial dimension is longer, from first to last implements overlay-operation in a manner of working continuously, and there are workpiece bows deformations greatly, surface
The defects such as hardness is uneven, fatigue resistance is low.
Summary of the invention
The present invention provides a kind of crystallizer foot roll surface overlaying technique and clamping workpiece tooling, it is intended to by existing built-up welding
The improvement of technique and clamping workpiece tooling reaches and reduces workpiece bows deformation, improve workpiece surface hardness uniformity, improve workpiece
The purpose of fatigue resistance.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of crystallizer foot roll surface overlaying technique is implemented built-up welding operation in workpiece surface with automatic submerged-arc welding method, is pressed
The following steps operation:
A, process before weldering: selecting diameter is the round steel raw material of D1, carries out turnery processing, and obtaining outer diameter is D2, and internal diameter is d's
Tube workpiece is covered, and reserves the guide groove that length dimension is L at workpiece both ends；
B, clamping workpiece: by workpiece both ends clamping on the chuck of surfacing equipment；
C, transition zone is segmented built-up welding: workpiece being divided into tetra- sections of A, B, C, D, using transition zone special welding wire from workpiece middle part
Position carries out workpiece B, C sections of overlay-operation to both ends built-up welding first, and carries out temperature measurement with infrared thermometer, beyond setting
When fixed interlayer temperature range, stop this section of built-up welding, after the completion of B, C sections of built-up welding of workpiece, carries out workpiece A, D section in the same way
Thus overlay-operation completes the built-up welding of transition zone；
D, workpiece is cooling: the workpiece for completing transition zone built-up welding being put into incubator and is slowly cooled to room temperature；
E, first pass wearing layer built-up welding: using wearing layer special welding wire, and according to the sequence of step c, it is wear-resisting to complete first pass
The built-up welding of layer；
F, second time wearing layer built-up welding: step e is repeated, the built-up welding of second time wearing layer is completed；
G, post weld heat treatment: workpiece is slowly cooled to 50 DEG C hereinafter, carrying out post weld heat treatment again, heat treatment temperature is
550 ± 10 DEG C, soaking time is 10 hours, hereafter enters postwelding process according to drawing requirement.
Above-mentioned crystallizer foot roll surface overlaying technique, in step a, the material of round steel raw material is 42CrMo, D1=
100mm, after turnery processing, workpiece outer diameter D 2=92mm, internal diameter d=45mm, workpiece both ends guide groove length L=6mm.
Above-mentioned crystallizer foot roll surface overlaying technique, the transition zone special welding wire are 0Cr17 welding wire；The wearing layer is special
It is Ni4 welding wire with welding wire, the 0Cr17 welding wire and Ni4 gage of wire are φ 3.2mm.
Above-mentioned crystallizer foot roll surface overlaying technique, in step c, the interlayer temperature range of setting 150-250 DEG C it
Between.
Above-mentioned crystallizer foot roll surface overlaying technique, welding current 250-350A, weldingvoltage 25-32V.
Above-mentioned crystallizer foot roll surface overlaying technique, welding manner are single track spiral welding, and welding bead amount of lap is half.
Above-mentioned crystallizer foot roll surface overlaying technique, in step g, with 30-50 DEG C/h of speed after the completion of workpiece built-up welding
It is slowly cold after degree is cooled to 50 DEG C hereinafter, being then warming up to 550 ± 10 DEG C, heat preservation 10 hours with 30-50 DEG C/h of speed
But, wherein during being cooled to 300 DEG C by 550 ± 10 DEG C, cooling rate is 25-30 DEG C/h, is cooled to 100 DEG C by 300 DEG C
In the process, cooling rate is 30-40 DEG C/h, last cooled to room temperature.
A kind of crystallizer foot roll surface overlaying clamping workpiece tooling, including the chuck and foot to be welded being mounted on surfacing equipment
Roller workpiece both ends it is top；It is described it is top be made of clamping part, ventilation unit and the portion of holding out against, the clamping part by chuck claw press from both sides
Tightly, the portion of holding out against is conical structure, and the vent locations are in clamping part and hold out against between portion, is equipped with one group of edge in ventilation unit
Radial through-hole and perforation that circumferencial direction is evenly arranged hold out against the axially extending bore in portion, are made of axially extending bore, radial through-hole top
Aeration structure.
Above-mentioned crystallizer foot roll surface overlaying clamping workpiece tooling, further includes solder flux scraper plate, and the solder flux scraper plate is mounted on
On the frame of surfacing equipment.
The beneficial effects of the present invention are:
Crystallizer foot roll surface overlaying technique of the present invention, using automatic submerged-arc welding method carry out transition zone and
Twice of wearing layer built-up welding is all made of segmented welding mode during the weldering of each layer heap, i.e., gradually implements heap to both ends from intermediate
Weldering process, and temperature measurement is carried out with infrared thermometer, guarantee that interlayer temperature meets setting value requirement, therefore efficiently solve
From first to last because workpiece is continuously in deflection problems of too caused by the condition of high temperature in weld deposit process.
Crystallizer foot roll surface overlaying technique described in invention, post weld heat treatment temperature is set as 550 ±
10 DEG C, soaking time is set as 10 hours, so that postwelding workpiece is obtained tempered sorbite tissue, at normal temperature due to tempered sorbite
It is statenchyma, there is good comprehensive performance, hardness HRC35-38, to improves workpiece surface hardness and antifatigue
Intensity.
Crystallizer foot roll surface overlaying clamping workpiece tooling of the present invention is provided with aeration structure in both ends are top,
Part welding heat can be distributed by top aeration structure, and absorb workpiece using top elastic deformation and be heated
Expansion energy, so as to avoid the bending deformation of workpiece.
In conclusion the present invention has reached reduction workpiece by the improvement to existing bead-welding technology and clamping workpiece tooling
Bending deformation, the purpose for improving workpiece surface hardness uniformity, improving fatigue resistance after workpiece is repaired.
Detailed description of the invention
Fig. 1 is processing structure and dimensional parameters schematic diagram before the weldering of crystallizer foot roll workpiece；
Fig. 2 is crystallizer foot roll surface overlaying clamping workpiece tool structure schematic diagram of the present invention；
Fig. 3 is M-M the schematic diagram of the section structure in Fig. 2；
Fig. 4 is top the schematic diagram of the section structure in clamping workpiece tooling；
Fig. 5 is N-N the schematic diagram of the section structure in Fig. 4.
Fig. 6 is post weld heat treatment process curve figure.
Each list of reference numerals in figure are as follows: 1, workpiece, 1-1, guide groove, 2, chuck, 3, top, 3-1, clamping part, 3-2, ventilation unit,
3-3, portion, 3-4, radial through-hole, 3-5, axially extending bore, 4, wire feeder, 5, submerged arc flux feed mechanism, 6, submerged-arc welding are held out against
Solder flux, 7, solder flux scraper plate.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the invention will be further described.
Referring to Fig. 1, Fig. 2, Fig. 3, crystallizer foot roll surface overlaying technique of the present invention, using automatic submerged-arc welding method
Implement built-up welding operation on 1 surface of workpiece, preferred weld electric current is 250-350A, and weldingvoltage 25-32V, welding manner is single
Road spiral welding, welding bead amount of lap are half, follow these steps concrete operations:
A, process before weldering: selection material is the round steel raw material of 42CrMo, diameter D1=100mm, carries out turnery processing, obtains
Outer diameter D 2=92mm, internal diameter are the set tube workpiece of d=45mm, and reserve the guide groove 1- of length dimension L=6mm at 1 both ends of workpiece
1；
B, clamping workpiece: by 1 both ends clamping of workpiece on the chuck 2 of surfacing equipment；
C, transition zone is segmented built-up welding: workpiece 1 being divided into tetra- sections of A, B, C, D, uses diameter for the 0Cr17 welding wire of φ 3.2mm
From the intermediate position of workpiece 1 to both ends built-up welding, moved horizontally with the wire feeder 4 of surfacing equipment, chuck 2 drives workpiece 1 to rotate
Mode carries out B, C sections of workpiece of overlay-operation first, in the process by submerged arc flux feed mechanism 5 by submerged arc flux 6
Incline and be sprinkling upon on welding bead, and carries out temperature measurement with infrared thermometer, the interlayer temperature of the 150-250 DEG C of range beyond setting
When, stop this section of built-up welding, after the completion of B, C sections of built-up welding of workpiece, carries out workpiece A, D section overlay-operation in the same way, it is thus complete
At the built-up welding of transition zone；
D, workpiece is cooling: the workpiece for completing transition zone built-up welding being put into incubator and is slowly cooled to room temperature；
E, first pass wearing layer built-up welding: using diameter for the Ni4 welding wire of φ 3.2mm, according to the sequence of step c, completes the
The built-up welding of a time wearing layer；
F, second time wearing layer built-up welding: step e is repeated, the built-up welding of second time wearing layer is completed；
G, post weld heat treatment: after the completion of workpiece built-up welding with 30-50 DEG C/h of speed be cooled to 50 DEG C hereinafter, then with
After 30-50 DEG C/h of speed is warming up to 550 ± 10 DEG C, heat preservation 10 hours, Slow cooling, wherein being cooled to by 550 ± 10 DEG C
During 300 DEG C, cooling rate is 25-30 DEG C/h, during being cooled to 100 DEG C by 300 DEG C, cooling rate 30-40
DEG C/h, last cooled to room temperature, shown in post weld heat treatment process curve Fig. 6.
Referring to Fig. 2, Fig. 3, Fig. 4, Fig. 5, crystallizer foot roll surface overlaying clamping workpiece tooling of the present invention includes peace
Top 3 and solder flux scraper plate 7 of chuck 2, sufficient roller workpiece both ends to be welded on surfacing equipment；Described top 3 by clamping part 3-
1, ventilation unit 3-2 and hold out against portion 3-3 composition, the clamping part 3-1 by chuck 2 claw clamp, it is described hold out against portion 3-3 be circular cone
Body structure, the ventilation unit 3-2 are located at clamping part 3-1 and hold out against between portion 3-2, are equipped with one group of circumferentially side in ventilation unit 3-2
The axially extending bore 3-5 that portion 3-3 is held out against to the radial through-hole 3-4 and perforation being evenly arranged, by axially extending bore 3-5, radial through-hole 3-4
It forms top aeration structure, in workpiece weld deposit process, part welding heat can both have been distributed by the top aeration structure,
Workpiece expanded by heating energy is absorbed using top elastic deformation again；The solder flux scraper plate 7 is mounted on the frame of surfacing equipment
On, for removing the submerged arc flux 6 being adhered on welding bead.
Claims (6)
1. a kind of crystallizer foot roll surface overlaying technique implements built-up welding operation in workpiece surface with automatic submerged-arc welding method, special
Sign is to follow these steps to operate:
A, process before weldering: selecting diameter is the round steel raw material of D1, carries out turnery processing, and obtaining outer diameter is D2, and internal diameter is the casing of d
Workpiece, and the guide groove (1-1) that length dimension is L is reserved at workpiece (1) both ends；
Round steel raw material material is 42CrMo, D1=100mm, after turnery processing, workpiece (1) outer diameter D 2=92mm, internal diameter d=
45mm, workpiece both ends guide groove (1-1) length L=6mm；
B, clamping workpiece: by workpiece (1) both ends clamping on the chuck (2) of surfacing equipment；
C, transition zone is segmented built-up welding: workpiece (1) being divided into tetra- sections of A, B, C, D, using transition zone special welding wire from workpiece middle part
To both ends built-up welding, the transition zone special welding wire is 0Cr17 welding wire for position；Carry out workpiece B, C sections of overlay-operation first, and with red
Outside line temperature measurer carries out temperature measurement, and the interlayer temperature range of setting is between 150-250 DEG C, the interlayer temperature model beyond setting
When enclosing, stop this section of built-up welding, after the completion of B, C sections of built-up welding of workpiece, carries out workpiece A, D section overlay-operation in the same way, thus
Complete the built-up welding of transition zone；
D, workpiece is cooling: the workpiece for completing transition zone built-up welding being put into incubator and is slowly cooled to room temperature；
E, first pass wearing layer built-up welding: wearing layer special welding wire is used, the wearing layer special welding wire is Ni4 welding wire, described
0Cr17 welding wire and Ni4 gage of wire are φ 3.2mm；According to the sequence of step c, the built-up welding of first pass wearing layer is completed；
F, second time wearing layer built-up welding: step e is repeated, the built-up welding of second time wearing layer is completed；
G, post weld heat treatment: slowly cooling to 50 DEG C hereinafter, carry out post weld heat treatment again for workpiece, and heat treatment temperature is 550 ±
10 DEG C, soaking time is 10 hours, hereafter hardness HRC35-38 enters postwelding process according to drawing requirement.
2. crystallizer foot roll surface overlaying technique according to claim 1, characterized in that welding current 250-350A,
Weldingvoltage is 25-32V.
3. crystallizer foot roll surface overlaying technique according to claim 2, characterized in that welding manner is single track spiral
Weldering, welding bead amount of lap are half.
4. crystallizer foot roll surface overlaying technique according to claim 3, characterized in that in step g, workpiece heap is soldered
Speed after with 30-50 DEG C/h is cooled to 50 DEG C hereinafter, being then warming up to 550 ± 10 with 30-50 DEG C/h of speed
DEG C, after heat preservation 10 hours, Slow cooling, wherein during being cooled to 300 DEG C by 550 ± 10 DEG C, cooling rate is 25-30 DEG C/
Hour, during being cooled to 100 DEG C by 300 DEG C, cooling rate is 30-40 DEG C/h, last cooled to room temperature.
5. a kind of crystallizer foot roll surface overlaying clamping workpiece tooling, for cooperating knot described in any one of Claims 1-4
Brilliant device foot roller surface bead-welding technology, to complete crystallizer foot roll workpiece surface built-up welding operation, characterized in that the crystallizer foot roll
Surface overlaying clamping workpiece tooling includes top (3) of the chuck (2) being mounted on surfacing equipment and sufficient roller workpiece both ends to be welded；
Top (3) are by clamping part (3-1), ventilation unit (3-2) and hold out against portion (3-3) and form, and the clamping part (3-1) is by chuck
(2) claw clamps, and hold out against portion (3-3) is conical structure, and the ventilation unit (3-2) is located at clamping part (3-1) and top
Between tight portion (3-2), one group of radial through-hole evenly distributed in the circumferential direction (3-4) and perforation top are equipped at ventilation unit (3-2)
The axially extending bore (3-5) in tight portion (3-3), forms top aeration structure by axially extending bore (3-5), radial through-hole (3-4).
6. crystallizer foot roll surface overlaying clamping workpiece tooling according to claim 5, characterized in that the crystallizer foot
Roller surface built-up welding clamping workpiece tooling further includes solder flux scraper plate (7), and the solder flux scraper plate (7) is mounted on the frame of surfacing equipment
On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710546846.9A CN107414326B (en) | 2017-07-06 | 2017-07-06 | A kind of crystallizer foot roll surface overlaying technique and clamping workpiece tooling |
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| CN201710546846.9A CN107414326B (en) | 2017-07-06 | 2017-07-06 | A kind of crystallizer foot roll surface overlaying technique and clamping workpiece tooling |
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| CN107414326B true CN107414326B (en) | 2019-08-23 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109623095B (en) * | 2019-01-30 | 2021-02-02 | 烟台蓝鲸增材有限公司 | Isothermal welding bead method for high-hardness material repair welding |
| CN110560853A (en) * | 2019-09-23 | 2019-12-13 | 江苏瑞米克金属技术有限公司 | surfacing method for roller (shaft) workpiece |
| CN112730121B (en) * | 2020-12-24 | 2024-04-02 | 江苏徐工工程机械研究院有限公司 | Pin shaft processing and quality detecting device and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439476A (en) * | 2003-02-24 | 2003-09-03 | 天津大学 | Build-up welding process for repairing cold rolling intermediate roller |
| CN1872478A (en) * | 2005-05-30 | 2006-12-06 | 上海鸿威硬面技术有限公司 | Built up welding technique for compound mould in hard surface in use for finish forge machine |
| 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 |
| CN102049593A (en) * | 2009-11-04 | 2011-05-11 | 中冶焊接科技有限公司 | Cold rolling back-up roll cover face submerged arc surfacing method and surfacing solder wire material |
| CN102357778A (en) * | 2011-09-22 | 2012-02-22 | 宁波中超机器有限公司 | Manufacturing method of pulling straightening roller |
| CN103009015A (en) * | 2013-01-13 | 2013-04-03 | 邯郸市永固冶金备件有限公司 | Method for manufacturing double metal composite wear-resistant metallurgical rollers |
| CN104827171A (en) * | 2015-03-20 | 2015-08-12 | 马鞍山市百源机械有限公司 | Surface overlaying method of foot roll of continuous casting machine |
| JP2016159335A (en) * | 2015-03-03 | 2016-09-05 | アイエヌジ商事株式会社 | Build-up method |
-
2017
- 2017-07-06 CN CN201710546846.9A patent/CN107414326B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439476A (en) * | 2003-02-24 | 2003-09-03 | 天津大学 | Build-up welding process for repairing cold rolling intermediate roller |
| CN1872478A (en) * | 2005-05-30 | 2006-12-06 | 上海鸿威硬面技术有限公司 | Built up welding technique for compound mould in hard surface in use for finish forge machine |
| 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 |
| CN102049593A (en) * | 2009-11-04 | 2011-05-11 | 中冶焊接科技有限公司 | Cold rolling back-up roll cover face submerged arc surfacing method and surfacing solder wire material |
| CN102357778A (en) * | 2011-09-22 | 2012-02-22 | 宁波中超机器有限公司 | Manufacturing method of pulling straightening roller |
| CN103009015A (en) * | 2013-01-13 | 2013-04-03 | 邯郸市永固冶金备件有限公司 | Method for manufacturing double metal composite wear-resistant metallurgical rollers |
| JP2016159335A (en) * | 2015-03-03 | 2016-09-05 | アイエヌジ商事株式会社 | Build-up method |
| CN104827171A (en) * | 2015-03-20 | 2015-08-12 | 马鞍山市百源机械有限公司 | Surface overlaying method of foot roll of continuous casting machine |
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