CN106475661A - A kind of bead-welding technology of wear-resisting millstone sheet - Google Patents
A kind of bead-welding technology of wear-resisting millstone sheet Download PDFInfo
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- CN106475661A CN106475661A CN201610977718.5A CN201610977718A CN106475661A CN 106475661 A CN106475661 A CN 106475661A CN 201610977718 A CN201610977718 A CN 201610977718A CN 106475661 A CN106475661 A CN 106475661A
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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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
-
- 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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0272—Rods, electrodes, wires with more than one layer of coating or sheathing material
-
- 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
-
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
-
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to a kind of bead-welding technology of wear-resisting millstone sheet, this technique comprises the following steps：(1) millstone sheet liner plate layout：Using 4 pieces of millstone sheet liner plate layouts, and by 4 wedge bolt positioning；(2) determine mill sectional dimension；(3) prepare before millstone sheet weldering；(4) mill working lining built-up welding：Control the mill temperature after described process to be not more than 100 DEG C, under normal temperature condition, multiple-bead deposit is carried out to the mill after described process using ceramic wear-resisting surfacing welding；(5) excision forming：Using plasma cutting, according to numbering, mill is cut into monolithic, the burr that splash in cleaning surface and cutting produces, confirm size, enter machining sequence and complete Product processing.Present invention process is simple, easy to implement, and by multiple-bead deposit, built-up welding thickness can reach 32mm and can guarantee that block is not fallen in long-term work under abrasion, impact operating mode.
Description
Technical field
The present invention relates to hardfacing technical field, the bead-welding technology of more particularly, to a kind of wear-resisting millstone sheet.
Background technology
In coal-grinding pulverized coal preparation system, how to extend the service life of powder manufacturing apparatus consumable accessory, reduce maintenance cost, it has also become
The important channel that enterprise increases economic efficiency further., as its main consumable accessory taking coal mill system medium-speed pulverizer as a example
Mill, for improving its wearability and impact resistance, millstone sheet material is usually each trade mark cast steel, even if being combined using rich chromium cast iron
Millstone sheet, its service life is only also only 8000 ~ 10000 hours.Therefore, abrasive disk life-span relatively low always restriction coal mill system
The key factor of energy.
With the application of hard-face overlaying welding technology, each coal-grinding Zhi Fen enterprise has employed the built-up welding based on wear resistance electrode, welding wire
Re-manufacturing technology, improves the anti-wear performance of millstone sheet to a certain extent, extends the service life of millstone sheet.But it is existing resistance to
Mill technique for overlaying mainly improves deposited metal layer hardness by adding tungsten carbide particle or increase carbon content with other alloys,
Generally existing carbon equivalent is high, plasticity is low, impact resistance is low, easily peels off（Fall block）The problems such as.Therefore, existing hardfacing mill
Disk watt generally existing deposited metal layer is thin, poor reliability, service life remain unchanged relatively low the problems such as.Additionally, existing rich chromium cast iron
Build-up wear-resistant watt, due to built-up welding rich chromium cast iron metal level using being only limitted to effective cross-section on the foundry goods of 100 ~ 140mm.Logical
Cross practice operation, be a kind of waste of high performance material for whole wear resistance castings, it not only increases production and operation cost,
It is also improper to the utilization of rich chromium cast iron metals resources.
Therefore, in view of the mill material of coal-grinding powder manufacturing apparatus is typically various trade mark potassium steel, the present situation of cast steel, in conjunction with suitable
For welding, the potassium steel of the various trade mark of built-up welding, cast steel base material, overlay cladding thickness up to 32mm, surfacing layer metal hardness up to
A kind of ceramic wear-resisting surfacing welding of HRC75, based on the double-layer metal wearable millstone sheet of specific bead-welding technology molding innovation, real
The existing high life（Service life is 1.8 ~ 2.5 times of rich chromium cast iron millstone sheet）Mill preparation has important practical significance and wide
Application prospect.
Content of the invention
The technical problem to be solved is to provide a kind of process is simple, the built-up welding of wear-resisting millstone sheet easy to implement
Technique.
For solving the above problems, a kind of bead-welding technology of wear-resisting millstone sheet of the present invention, comprise the following steps：
(1) millstone sheet liner plate layout：Using 4 pieces of millstone sheet liner plate layouts, and by 4 wedge bolt positioning；
(2) mill sectional dimension is determined using following formula：H=h+2%·D+20mm；Wherein：The millstone sheet that H determines for Bead weld repair is high
Degree size, unit mm；H is the intrinsic height dimension of millstone sheet that is worn, unit mm；D is grinding roller diameter, unit mm；
(3) prepare before millstone sheet weldering：
1., after the cleaning of mill worn-out work surface, the crackle that mill exists is detected using penetrant inspection method, millstone sheet crackle is polished
After smooth, crack depth is detected using ultrasonic examination, if crack depth exceedes the 1/4 of wall thickness, mill is carried out scrapping process；
If crack depth is less than the 1/4 of wall thickness, crackle is polished and is carried out repair welding process using J506 welding rod；
2. confirm the every block number of mill, assembling by number is fixed on positioner；
(4) mill working lining built-up welding：The mill temperature after described process is controlled to be not more than 100 DEG C, resistance to using pottery under normal temperature condition
Mill surfacing welding carries out multiple-bead deposit to the mill after described process；
(5) excision forming：
Using plasma cutting, according to numbering, mill is cut into monolithic, splash and cut the burr producing in cleaning surface,
Confirm size, enter machining sequence and complete Product processing.
(4) middle built-up welding wlding is ceramic wear-resisting surfacing welding to described step, the public footpath of this welding rod is 3.2mm, 4.0mm,
5.0mm, including core wire and coating；The weight coefficient that described coating accounts for welding rod gross weight is 0.40 ~ 0.48；Wherein
On the basis of core wire gross weight, by weight percentage, its chemical composition is described core wire：C 2 ~ 4%, Cr 9 ~ 12%, Mn
1 ~ 2%, Nb 0.1 ~ 0.3%, Mo 0.3 ~ 1%, Ti 0.1 ~ 0.4%, V 0.1 ~ 1%, Si 0.2 ~ 1%, P≤0.03%, S≤
0.04%, balance of Fe；
On the basis of coating gross weight, by weight percentage, its chemical composition is described coating：Marble 18 ~ 22%, fluorite
15 ~ 20%, Muscovitum+bentonite 20 ~ 26%, rutile+titanium dioxide 12 ~ 15%, ferrotianium 5 ~ 8%, ferromanganese 5 ~ 8%, ferrosilicon 5 ~ 8%, ferrochrome 3
~ 6%, nickel 1 ~ 3%, rare earth oxide 1 ~ 3%.
(4) middle multiple-bead deposit condition refers to described step：
When the public footpath of welding rod is 3.2mm, its corresponding welding current is 110 ~ 150 amperes to A；When the public footpath of welding rod is 4.0mm
When, its corresponding welding current is 160 ~ 200 amperes；When welding rod public footpath be 5.0mm when, its corresponding welding current be 170 ~
230 amperes；
B voltage range is 20 ~ 28V；
C mill face becomes 15 ° of climbing welding with welding gun, and mill face and tip spacing are 10 ~ 15mm；
D welding bead takes 45% ~ 50%, wide 8 ~ 14 mm of welding bead；
E hardfacing alloy thickness degree a size of 1 ~ 32mm.
The present invention compared with prior art has advantages below：
1st, 12 pieces of millstone sheet liner plate layouts that traditional mill designs are improved to 4 pieces of millstone sheet liner plate layouts by the present invention, increased
The weight of monolithic watt simultaneously makes watt to strengthen with the laminating degree of abrasive disk seat, improves the stability of installation.
2nd, in the present invention lining board for grinding discs raceway radian increase and millstone sheet height dimension and raceway radian size improvement
The requirements to mill performance for the factor such as the grindability of material bed thickness and material, distribution of particles, water content are taken into full account.
3rd, the ceramic wear-resisting surfacing welding in the present invention contains pottery, titanium, chromium, manganese, molybdenum, vanadium, niobium etc. because of deposited metal, makes
Material surfacing layer metal microstructure very fine and smooth, wear-resisting mutually be in uniform close-packed hexagonal structure, define quite stable and
Hard carbide is so that surfacing layer metal assumes hardness height（Postwelding initial hardness reaches HRC68, using rear hardness up to
HRC75）, excellent wear-resisting property, corrosion resistance preferable（Deposited metal contains the elements such as chromium, nickel, so that overlay cladding is possessed certain resistance to
Corrosivity）Feature.
4th, do not need to preheat during present invention welding, can AC/DC, welding arc is stable, splash less, de- slag is easy.By many
Layer built-up welding, built-up welding thickness can reach 32mm and can guarantee that block is not fallen in long-term work under abrasion, impact operating mode.
5th, present invention process is simple, easy to implement.
Brief description
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in further detail.
Fig. 1 is built-up welding mill sectional dimension figure of the present invention.
Specific embodiment
A kind of bead-welding technology of wear-resisting millstone sheet, comprises the following steps：
(1) millstone sheet liner plate layout：Using 4 pieces of millstone sheet liner plate layouts, and by 4 wedge bolt positioning.
(2) the height dimension in mill section is determined using following formula：H=h+2%·D+20mm（Referring to Fig. 1）；Wherein：H is built-up welding
Repair the millstone sheet height dimension determining, unit mm；H is the intrinsic height dimension of millstone sheet that is worn, unit mm；D is mill
Roller diameter, unit mm；Additionally, R is the raceway curvature half being determined according to worn-out millstone sheet actual size during Bead weld repair in Fig. 1
Footpath size, the millstone sheet hardfacing alloy layer thickness that t determines for Bead weld repair.
(3) prepare before millstone sheet weldering：
1., after the cleaning of mill worn-out work surface, the crackle that mill exists is detected using penetrant inspection method, millstone sheet crackle is polished
After smooth, crack depth is detected using ultrasonic examination, if crack depth exceedes the 1/4 of wall thickness, mill is carried out scrapping process；
If crack depth is less than the 1/4 of wall thickness, crackle is polished and is carried out repair welding process using J506 welding rod；
2. confirm the every block number of mill, assembling by number is fixed on positioner.
(4) mill working lining built-up welding：Mill temperature after control process is not more than 100 DEG C, resistance to using pottery under normal temperature condition
Mill surfacing welding carries out multiple-bead deposit to the mill after processing.
This built-up welding wlding is ceramic wear-resisting surfacing welding, and the public footpath of this welding rod is 3.2mm, 4.0mm, 5.0mm, including core wire
And coating；The weight coefficient that coating accounts for welding rod gross weight is 0.40 ~ 0.48；Wherein
On the basis of core wire gross weight, by weight percentage, its chemical composition is core wire：C 2 ~ 4%, Cr 9 ~ 12%, Mn 1 ~
2%, Nb 0.1 ~ 0.3%, Mo 0.3 ~ 1%, Ti 0.1 ~ 0.4%, V 0.1 ~ 1%, Si 0.2 ~ 1%, P≤0.03%, S≤0.04%,
Balance of Fe；
On the basis of coating gross weight, by weight percentage, its chemical composition is coating：Marble 18 ~ 22%, fluorite 15 ~
20%, Muscovitum+bentonite 20 ~ 26%, rutile+titanium dioxide 12 ~ 15%, ferrotianium 5 ~ 8%, ferromanganese 5 ~ 8%, ferrosilicon 5 ~ 8%, ferrochrome 3 ~
6%, nickel 1 ~ 3%, rare earth oxide 1 ~ 3%.
The preparation method of this ceramic wear-resisting surfacing welding adopts traditional handicraft, that is,：Core wire polishing is derusted, alignment → medicine is dry mixed
Powder → addition waterglass wet mixing → the welding rod of welding rod → dry is twisted on core wire in drying in oven → product inspection using wet-milling
Test.
Multiple-bead deposit condition refers to：
When the public footpath of welding rod is 3.2mm, its corresponding welding current is 110 ~ 150 amperes to A；When the public footpath of welding rod is 4.0mm
When, its corresponding welding current is 160 ~ 200 amperes；When welding rod public footpath be 5.0mm when, its corresponding welding current be 170 ~
230 amperes；
B voltage range is 20 ~ 28V；
C mill face becomes 15 ° of climbing welding with welding gun, and mill face and tip spacing are 10 ~ 15mm；
D welding bead takes 45% ~ 50%, wide 8 ~ 14 mm of welding bead；
E hardfacing alloy thickness degree a size of 1 ~ 32mm.
(5) excision forming：
Using plasma cutting, according to numbering, mill is cut into monolithic, splash and cut the burr producing in cleaning surface,
Confirm size, enter machining sequence and complete Product processing.
Embodiment 1 welding base material is Jiu Gang HTC cement plant MPF1915 disc roll pulverizer mill（Material is
ZG25）, described multiple-bead deposit layer be 4 layers, described in the first floor welding rod public affairs footpath be 4.0mm, welding current be 124 amperes, weldingvoltage
24V；Remaining each layer described welding rod public affairs footpath is 5.0mm, and welding current is 180 amperes, weldingvoltage 32V；Wide 10 ~ the 11mm of welding bead,
86 ~ 96 DEG C of weld interpass temperature, the average 22mm of overlay cladding gross thickness.Postwelding hardness reaches HRC68, using inspection hardness after one month
Reach HRC75, no fall block.
Embodiment 2 welding base material is Jiu Gang HTC cement plant MPF1713 disc roll pulverizer mill（Material is
ZG25）, described multiple-bead deposit layer be 4 layers, described in the first floor welding rod public affairs footpath be 3.2mm, welding current be 115 amperes, weldingvoltage
22V；Remaining each layer described welding rod public affairs footpath is 4.0mm, and welding current is 128 amperes, weldingvoltage 26V；Welding bead is wide by 9.5 ~
10.5mm, 83 ~ 95 DEG C of weld interpass temperature, the average 20mm of overlay cladding gross thickness.Postwelding hardness reaches HRC67, after one month
Check that hardness reaches HRC74, no fall block.
In above-described embodiment 1 ~ 2, welding rod is ceramic wear-resisting surfacing welding, including core wire and coating；Coating accounts for welding rod gross weight
The weight coefficient of amount is 0.45；Wherein
On the basis of core wire gross weight, by weight percentage, its chemical composition is core wire：C 2.46%, Cr 11.3%, Mn
1.32%, Nb 0.132%, Mo 0.468%, Ti 234%, V 0.264%, Si 0.65%, P 0.021%, S 0.023%, balance of
Fe；
On the basis of coating gross weight, by weight percentage, its chemical composition is coating：Marble 20%, fluorite 17%, Muscovitum
+ bentonite 23%, rutile+titanium dioxide 13%, ferrotianium 7%, ferromanganese 6%, ferrosilicon 6%, ferrochrome 4%, nickel 2%, rare earth oxide 2%.
It should be understood that embodiment discussed here and embodiment simply to illustrate that, person skilled in the art can be proposed
Various modifications and variations, such modifications and variations are included within spirit herein spirit and scope and appended claim
In the range of.
Claims (3)
1. a kind of bead-welding technology of wear-resisting millstone sheet, comprises the following steps：
(1) millstone sheet liner plate layout：Using 4 pieces of millstone sheet liner plate layouts, and by 4 wedge bolt positioning；
(2) mill sectional dimension is determined using following formula：H=h+2%·D+20mm；Wherein：The millstone sheet that H determines for Bead weld repair is high
Degree size, unit mm；H is the intrinsic height dimension of millstone sheet that is worn, unit mm；D is grinding roller diameter, unit mm；
(3) prepare before millstone sheet weldering：
1., after the cleaning of mill worn-out work surface, the crackle that mill exists is detected using penetrant inspection method, millstone sheet crackle is polished
After smooth, crack depth is detected using ultrasonic examination, if crack depth exceedes the 1/4 of wall thickness, mill is carried out scrapping process；
If crack depth is less than the 1/4 of wall thickness, crackle is polished and is carried out repair welding process using J506 welding rod；
2. confirm the every block number of mill, assembling by number is fixed on positioner；
(4) mill working lining built-up welding：The mill temperature after described process is controlled to be not more than 100 DEG C, resistance to using pottery under normal temperature condition
Mill surfacing welding carries out multiple-bead deposit to the mill after described process；
(5) excision forming：
Using plasma cutting, according to numbering, mill is cut into monolithic, splash and cut the burr producing in cleaning surface,
Confirm size, enter machining sequence and complete Product processing.
2. as claimed in claim 1 a kind of bead-welding technology of wear-resisting millstone sheet it is characterised in that：The (4) middle built-up welding weldering of described step
Material is ceramic wear-resisting surfacing welding, and the public footpath of this welding rod is 3.2mm, 4.0mm, 5.0mm, including core wire and coating；Described coating
The weight coefficient accounting for welding rod gross weight is 0.40 ~ 0.48；Wherein
On the basis of core wire gross weight, by weight percentage, its chemical composition is described core wire：C 2 ~ 4%, Cr 9 ~ 12%, Mn
1 ~ 2%, Nb 0.1 ~ 0.3%, Mo 0.3 ~ 1%, Ti 0.1 ~ 0.4%, V 0.1 ~ 1%, Si 0.2 ~ 1%, P≤0.03%, S≤
0.04%, balance of Fe；
On the basis of coating gross weight, by weight percentage, its chemical composition is described coating：Marble 18 ~ 22%, fluorite
15 ~ 20%, Muscovitum+bentonite 20 ~ 26%, rutile+titanium dioxide 12 ~ 15%, ferrotianium 5 ~ 8%, ferromanganese 5 ~ 8%, ferrosilicon 5 ~ 8%, ferrochrome 3
~ 6%, nickel 1 ~ 3%, rare earth oxide 1 ~ 3%.
3. as claimed in claim 1 a kind of bead-welding technology of wear-resisting millstone sheet it is characterised in that：Described step (4) middle multilamellar heap
Welding rod part refers to：
When the public footpath of welding rod is 3.2mm, its corresponding welding current is 110 ~ 150 amperes to A；When the public footpath of welding rod is 4.0mm
When, its corresponding welding current is 160 ~ 200 amperes；When welding rod public footpath be 5.0mm when, its corresponding welding current be 170 ~
230 amperes；
B voltage range is 20 ~ 28V；
C mill face becomes 15 ° of climbing welding with welding gun, and mill face and tip spacing are 10 ~ 15mm；
D welding bead takes 45% ~ 50%, wide 8 ~ 14 mm of welding bead；
E hardfacing alloy thickness degree a size of 1 ~ 32mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110877170A (en) * | 2019-12-04 | 2020-03-13 | 河海大学常州校区 | Surfacing electrode, preparation method and dredging reamer abrasion repair surfacing method |
| CN111112964A (en) * | 2020-01-08 | 2020-05-08 | 长治市三耐铸业有限公司 | Arc powder concentrator blade surfacing method |
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