CN110343986A - For the construction method in zinc-plated sinking roller shaft end composite bush - Google Patents
For the construction method in zinc-plated sinking roller shaft end composite bush Download PDFInfo
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- CN110343986A CN110343986A CN201910645419.5A CN201910645419A CN110343986A CN 110343986 A CN110343986 A CN 110343986A CN 201910645419 A CN201910645419 A CN 201910645419A CN 110343986 A CN110343986 A CN 110343986A
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- welding
- zinc
- sinking roller
- shaft end
- construction method
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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
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or 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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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Abstract
The invention discloses a kind of construction methods, especially disclose a kind of construction method in zinc-plated sinking roller shaft end composite bush, belong to anticorrosion process equipment parts design manufacturing process technology field.A kind of composite weld service life when can effectively extend composite bush is provided, avoid as far as possible because occur weld crack and/or delayed crack for the construction method in zinc-plated sinking roller shaft end composite bush.The construction method is based on the connecting sewing for being machined with groove, bushing is combined to the shaft end of zinc-plated sinking roller by welding, wherein, when the bushing to be welded to the shaft end of the zinc-plated sinking roller, weld seam is preheated before weldering, the hot isothermal holding of moisture eliminating frame is carried out to wlding, the interlayer temperature of welding, inspection are controlled in weldering and eliminate defect and the cooling combined weld seam of postwelding temperature control and its neighboring area of welding process to improve the intensity of composite weld, reduce in welding process and defect that postwelding generates on composite weld.
Description
Technical field
The present invention relates to a kind of construction methods, more particularly, to a kind of for applying in zinc-plated sinking roller shaft end composite bush
Work method belongs to overhaul of the equipments renovation technique technical field.
Background technique
Hot galvanizing sinking roller group is the zinc-plated sinking roller and material cobalt chromium tungsten of 316L stainless steel by material in cold rolling mill zinc pot
The axle sleeve of alloy forms.When work, sinking roller group is submerged in the zinc pot dissolved (zinc pot temperature is 480 DEG C ± 10 DEG C), to band
Steel plays guiding role, and the rotation of stabilizing roller and connecting lever entry are in contact before and after sinking roller, to avoid entry and roll shaft from being worn
It is lined with wear-resisting watt in entry, wear-resistant sleeve, axle sleeve and entry Neva is housed on roll shaft by welding and is separately fixed at sinking roller
Front and back is stablized in roller shaft head and connecting lever entry, and axle sleeve and fork watt play the high-speed rotating sliding of support rollers, the roller assembled
Group enters work in zinc pot.
Currently, leading to when axle sleeve and entry Neva are welded in the stable roller shaft head in sinking roller front and back and connecting lever entry
It is all often the conventional soldering techniques welding used, as shown in Figure 1.Outer end face of the welding ends due to existing axle sleeve and zinc-plated sinking roller
It being generally flush with, weld seam can only be the one-pass molding of evagination along one lap welding of the two contact line, weld seam, after being put into high temperature zinc pot, evagination
Weld seam is often fallen off in roll body operation process with after high temperature zinc liquid friction rapidly abrasion, and high temperature zinc liquid is caused to immerse alloy sheath,
It causes roll shaft is levigate or even rubs, cause to stop production, primitive axis covers online three, four days weld seams and just cracks and falls off, high after separation of welds
Warm zinc liquid, which enters between axle sleeve and axis, accelerates axle sleeve and axis to wear, and roll body cannot run well after axle sleeve is worn with axis, serious shadow
The production of cold rolling mill galvanized sheet is rung.
Dip-roll sleeve and axis Components Chemical are analyzed by us, composition analysis result such as table 1, table 2,
Axis 316L chemical component (%) table 1
Axle sleeve (cobalt-chromium-tungsten alloy) chemical component (%) table 2
| Specification | C | Si | Cr | Mn | Fe | Ni | Co | W |
| Cobalt-chromium-tungsten alloy | 1.3 | 1.6 | 28 | 1.0 | <8 | ≤3 | 58 | 4.50 |
And live test of many times obtains the reason of weld seam falls off rapidly are as follows:
1) intercrystalline corrosion
Since heavy grinding roller operating temperature (480 DEG C ± 10 DEG C in zinc pot) belong to the most dangerous temperature of intercrystalline corrosion.316L steel
Although phosphorus content only 0.03% is shown in Table 1, the carbon in cobalt-chromium-tungsten alloy, which dissolves in weld seam, still has sufficient carbon and chromium to be formed
Cr23C6, when chromium is reduced to 12%, forms Cr depletion zone and causes intercrystalline corrosion so that austenite crystal intragranular chromium be made to reduce.
2) welding interior stress is big
It is 15W/m DEG C that 316L stainless steel, which leads coefficient at 500 DEG C, and linear expansion coefficient 16 (10-6/ DEG C), cobalt-chromium-tungsten alloy exists
500 DEG C of hardness numbers are 340HV, and intensity index is also higher, and welding tendency of hardenability is serious.Cobalt-chromium-tungsten alloy and the welding of 316L steel belong to different
Kind metal welds, and biggish welding interior stress is generated in welding process, and these stress can not pass through heat treatment and eliminate.
3) generation of cold crack
2 are shown in Table due to containing more tendency of hardenability alloying element in cobalt-chromium-tungsten alloy, welding stress is big in welding process, produces
The tendency of raw and cold crackle is larger.
4) generation of fire check
From experiment it can be seen that liquid Zn has biggish corrosiveness to 316L steel.When high temperature, liquid Zn penetrates into 316L steel
In intergranular, it is cooling after zinc be mixed in 316L steel, when welding under the action of welding heat source, zinc is precipitated again dissolves in weld seam,
Formation low melting point, which is mixed in weld seam, generates fire check.
5) equipment running tension is big
When normal operation, sinking roller and connecting lever abrasion are smaller, when each roller group operation of unit is asynchronous, strip will be caused to run
Partially, at this moment only reach normal operation by increasing tension adjustment strip, while increasing spindle nose and connecting lever frictional force.Sometimes
There is the abrasion of sinking roller single side axis, forms biggish distortion power, promote weld cracking.
In conclusion the intercrystalline corrosion of weld metal, welding stress be big and the corrosion of zinc liquid, larger external tension promotees in addition
Weld cracking has been set to fall off.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of composite weld when can effectively extend composite bush makes
With the service life, avoid as far as possible because occur weld crack and/or delayed crack in zinc-plated sinking roller shaft end composite bush
Construction method.
Used technical solution is to solve above-mentioned technical problem:
A kind of construction method in zinc-plated sinking roller shaft end composite bush, the construction method is to be machined with groove
Connection to welding line based on, bushing is combined to the shaft end of zinc-plated sinking roller by welding,
Wherein, when the bushing to be welded to the shaft end of the zinc-plated sinking roller, weld seam is preheated before weldering, butt welding
Material carries out the hot isothermal holding of moisture eliminating frame, and interlayer temperature, inspection and the defect for eliminating welding process of welding, and weldering are controlled in weldering
The cooling combined weld seam of temperature control and its neighboring area are improved the intensity of composite weld, are reduced in welding process and postwelding is compound afterwards
The defect generated on weld seam.
Further, the groove is double V-groove.
The preferred mode of the above solution is that the support shaft of the zinc-plated sinking roller is the T-type axis with a frustum, it is described
Frustum be the T-type axis horizontal sides, the bushing be the T-type bushing with an end plate, in the outside of frustum small end
There is one layer of transition zone identical with the bushing material, the double V-groove between the end plate and the frustum is by end plate on wall
Half double V-groove on half double V-groove and the transition zone respective end in corresponding side is constituted.
Further, the transition zone on frustum small end lateral wall is progress built-up welding acquisition after machining Z-type groove
Overlay cladding.
The preferred mode of the above solution is that being completed when overlay cladding described in built-up welding using multi-pass welding built-up welding, built-up welding
When first welding bead is preheated, the interlayer temperature in welding process be not less than preheating temperature, but be no more than 65 DEG C；Every layer heap layer
Thickness be no more than 4 ㎜；When carrying out the built-up welding of each welding bead, every built-up welding completion is no more than after the weld seam of an electrode length
The next section of built-up welding welded is carried out again after carrying out Welding Residual Stress Relieving by Hammer Peening.
Further, during welding the sublayer built-up welding acquisition overlay cladding by two to three layer heaps, each layer heap weldering
The overlay-operation that dye penetrant inspection confirmation zero defect rear carries out next layer heap weldering sublayer is carried out after the completion of sublayer respectively, to whole
Post-weld annealed operation is carried out again after carrying out dye penetrant inspection confirmation zero defect after the completion of overlay-operation again.
The preferred mode of the above solution is that the weld seam after making annealing remains less than or is equal to 100 after the completion of annealing operation
DEG C/the cooling rate slow cooling of h to room temperature.
Further, during welding the sublayer built-up welding acquisition overlay cladding by two to three layer heaps, first layer built-up welding
Welding current be greater than other each layers welding current；And in Welding Residual Stress Relieving by Hammer Peening, by first tapping in the middle part of weld seam, so
The sequence gradually toward both ends, which eliminate, afterwards answers hammering operation.
Further, built-up welding uses the cobalt-based welding rod of φ 2.5mm, Combined Welding uses the cobalt-based welding rod of φ 3.2mm, before weldering
In drying box 150 DEG C bake one hour and keep the temperature it is used as needed, welding operation when using DC reverse connection operate.
Further, the angle in half double V-groove of the shaft end of bushing and zinc-plated sinking roller processing is 30~35 °.
The beneficial effects of the present invention are: the application first passes through the bushing of processing special shape and the sinking roller shaft shoulder is combined with each other
It forms corresponding welding groove and adds shaft shoulder welding transition layer, it is zinc-plated heavy to be then welded to bushing by the way of welding
Do not have the shaft end of roller, especially when the bushing to be welded to the shaft end of the zinc-plated sinking roller, is respectively adopted before weldering to special
The bushing and the sinking roller shaft shoulder of shape and based on adding shaft shoulder welding transition layer, carried out at the heat preservation of moisture eliminating frame heat to wlding
Reason, control in weldering the interlayer temperature of welding, inspection and eliminate welding process defect and the cooling combined weld seam of postwelding temperature control and
Its neighboring area is improved the intensity of composite weld, is reduced in welding process and the defect that generates on composite weld of postwelding.This
Sample, since the above-mentioned construction method of the application makes full use of the hot weld performance of cobalt-chromium-tungsten alloy and 316L stainless steel, respectively butt welding
The bushing and the sinking roller shaft shoulder of preceding processing special shape are combined with each other to form corresponding welding groove and add the shaft shoulder and weld
Cross layer, weldering neutralizes the weld seam of postwelding and has carried out having the processing being directed to, to not only ensure that the welding quality of weld seam, but also reduce
The probability that postwelding delayed crack generates, and then composite weld service life when effectively extending composite bush, keep away as far as possible
Exempt from because there is weld crack and/or delayed crack.
Detailed description of the invention
Fig. 1 is the simplified structure diagram that the existing welded connecting that construction method of the present invention is related to installs bushing；
Fig. 2 is that the groove that the construction method of the invention in zinc-plated sinking roller shaft end composite bush is related to and weld seam show
It is intended to.
In the figure, it is marked as bushing 1, zinc-plated sinking roller 2, shaft end 3, support shaft 4, frustum 5, end plate 6, transition zone 7.
Specific embodiment
It is a kind of composite weld service life when can effectively extend composite bush provided by the invention as shown in Figure 2,
The construction party being used in zinc-plated sinking roller shaft end composite bush because there is weld crack and/or delayed crack is avoided as far as possible
Method.For the construction method based on the connecting sewing for being machined with groove, it is zinc-plated heavy to be by welding combined to bushing 1
Do not have the shaft end 3 of roller 2, wherein when the bushing 1 to be welded to the shaft end 3 of the zinc-plated sinking roller 2, carry out before weldering to weld seam
Preheating carries out the hot isothermal holding of moisture eliminating frame to wlding, and the interlayer temperature of welding, inspection are controlled in weldering and eliminates lacking for welding process
The sunken and cooling combined weld seam of postwelding temperature control and its neighboring area neutralize to improve the intensity of composite weld, reduce welding process
The defect that postwelding generates on composite weld.The application first passes through the bushing and the sinking roller shaft shoulder of processing special shape, and then two
Person combines to form corresponding groove, then bushing is combined to the shaft end of zinc-plated sinking roller by the way of welding, is especially inciting somebody to action
When the bushing is welded to the shaft end of the zinc-plated sinking roller, it is respectively adopted before weldering to the bushing and sinking roller for processing special shape
The shaft shoulder and add shaft shoulder welding transition layer, the hot isothermal holding of moisture eliminating frame carried out to wlding, control in weldering welding interlayer temperature,
It checks and eliminates defect and the cooling combined weld seam of postwelding temperature control and its neighboring area of welding process to improve composite weld
Intensity reduces in welding process and the defect that generates on composite weld of postwelding.In this way, due to the above-mentioned construction method of the application
The hot weld performance of cobalt-chromium-tungsten alloy and 316L stainless steel is made full use of, respectively before butt welding, the weldering weld seam that neutralizes postwelding had
For processing, to not only ensure that the welding quality of weld seam, but also reduce the probability of postwelding delayed crack generation, in turn
Composite weld service life when effective extension composite bush, avoids as far as possible because there is weld crack and/or delayed crack.
In above embodiment, in conjunction with the design feature of bushing and support shaft 4, the groove is disposed as by the application
Double V-groove.Particularly as being, the support shaft 4 of the zinc-plated sinking roller 2 is the T-type axis with a frustum 5, and the frustum 5 is
The horizontal sides of the T-type axis, the bushing 1 are the T-type bushing with an end plate 6, are had on the lateral wall of frustum small end
There is one layer of transition zone 7 identical with 6 material of bushing, the double V-groove between the end plate 6 and the frustum 5 is by lining end plate 6
Half double V-groove in 7 respective end of half double V-groove and the transition zone in corresponding side is constituted, at this point, in bushing 1 and zinc-plated heavy
The angle for there be not half double V-groove of the shaft end processing of roller 2 is preferably 30~35 °.Correspondingly, small with frustum in order to improve transition zone 7
The bonding strength of lateral wall is held, the transition zone 7 on frustum small end lateral wall is progress built-up welding acquisition after machining Z-type groove
Overlay cladding.
Further, composite welding effect when built-up welding effect and composite welding in order to improve the overlay cladding, and
Reduce overlay cladding itself as far as possible and reduces subsequent welding quality into weld deposit process generation welding defect, Yi Jifu
The weldquality of welding is closed, the application is to carry out by following processes in built-up welding, i.e., when overlay cladding described in built-up welding uses
Multi-pass welding built-up welding is completed, and when built-up welding first preheats welding bead, and the interlayer temperature in welding process is not less than preheating temperature,
But it is no more than 65 DEG C；The thickness of every layer heap layer is no more than 4 ㎜；When carrying out the built-up welding of each welding bead, every built-up welding completion does not surpass
It crosses after the weld seam of an electrode length and carries out the built-up welding of next section of welding after carrying out Welding Residual Stress Relieving by Hammer Peening again.By two to
During three layer heaps weld the sublayer built-up welding acquisition overlay cladding, dye penetrant inspection is carried out respectively after the completion of each layer heap weldering sublayer
Confirmation zero defect rear carries out the overlay-operation of next layer heap weldering sublayer, after carry out coloring spy after the completion of whole overlay-operations again
Post-weld annealed operation is carried out again after wound confirmation zero defect.After the completion of annealing operation, the weld seam after making annealing is remained less than or is waited
In 100 DEG C/h cooling rate slow cooling to room temperature.During welding the sublayer built-up welding acquisition overlay cladding by two to three layer heaps,
The welding current of first layer built-up welding is greater than the welding current of other each layers；And in Welding Residual Stress Relieving by Hammer Peening, by first tapping
In the middle part of weld seam, then the sequence gradually toward both ends, which eliminate, answers hammering operation.Built-up welding uses the cobalt-based welding rod of φ 2.5mm, multiple
Close weldering use φ 3.2mm cobalt-based welding rod, weldering before in drying box 150 DEG C bake one hour and keep the temperature it is used as needed, welding
It is operated when operation using DC reverse connection.
Certainly, in the technical process of above-mentioned built-up welding, it can equally be well applied to welding operation when composite welding, because of bevel
The composite weld that composite weld afterwards, the either composite weld or end plate in 4 outer end of support shaft are connect with 5 small end of frustum,
Due to being the weld seam after bevel, therefore can be also required to point two to three layers of welding bead could weld completion, and outermost one
Layer weld seam, which is also required to multiple welding beads, can complete the welding of this layer of layer, so similarly needing to groove, wlding, centre
Layer is heated, is kept the temperature, eliminating the work such as stress and post weld heat treatment.That is, built-up welding transition zone and Combined Welding can be with
It is divided into two different processes, at this point, built-up welding certainly belongs to previous procedure, Combined Welding welds bushing on rear support axis
Be welded as latter procedure, the two processes can be successively individually present completely, i.e., after the completion of built-up welding again every certain time
Carry out Combined Welding.
In conclusion had further the advantage that using construction method provided by the present application come composite bush,
A kind of simple and practical welding side for extending zinc-plated sinking roller set weld seam service life under high temperature zinc liquid environment is provided
Method, 1) by zinc-plated sinking roller weld increase welding transition layer improve weld seam heat resistanceheat resistant crackle ability and zinc liquid crystal resistant to high temperatures
Between the ability corroded；2) interior slope mouthful is opened by cut oblique over first step axis, second step axis, in first step axle sleeve is opened
Slope mouthful over slope mouthful, second step axle sleeve, 60~80 ° of grooves that formation is conducive to welding when the two is assembled, which increase weld seam, to be had
Length is imitated, the area of section of weld joint is increased, increases the ability that weld seam meets with stresses；3) at least two layers of weld seam weldering is used
It connects, compared with existing disposable welding, the thickness of every layer of weld seam reduces, and the throat depth of innermost layer reduces, and infiltration is more abundant, makes
Weld seam temperature more evenly, reduces weld seam internal-external temperature difference；And 60~80 ° of grooves are equivalent to the increasing of weldering throat depth degree, more fully
Infiltration improves the ability that weld seam meets with stresses, and enhances the shortcomings that overcoming former one end welding easily by torsional fracture；4) every to have welded one
Section welding bead, hammers this section of welding bead, hammer the hammering face of welding bead be it is arc-shaped, hammering sequence is first in this section of welding bead
Portion, then the two sides of this section of welding bead are hammered, effectively reduce welding interior stress；5) the first step outer end face of dip-roll when assembling
The built-in angle of the First terrace of angle and axle sleeve forms welding groove, and weld seam is exactly built-in when welding, and the of axle sleeve
Two step sets are inserted in the second step axis of zinc-plated sinking roller, and axle sleeve second step angle forms built-in with second step axis angle
The both ends contact site of welding groove, such axle sleeve and axis all forms built-in weld seam, and such weld seam and axle sleeve, axis equal proportion are ground
Damage, before axle sleeve wear-thickness closes symbol requirement, high temperature zinc liquid will not immerse unstable wear in set by weld, reach
Effectively extend the purpose of zinc-plated dip-roll sleeve weld seam service life, while reducing the cost of overhaul, it is ensured that production, therefore,
It has promotes the use meaning and social benefit well.
Embodiment one
Technical solution of the present invention: the following steps carried out including sequence:
1 welding preparation:
1.1 design and process a kind of integrated double step inclined mouth type axle sleeve that can increase weld size, and material is cobalt chromium tungsten
Alloy
Double step inclined mouth type axle sleeve is by slope mouth, second step, second step slope mouthful in first step set, first step
Four parts composition, the inclined groove in first step set end face is crossed at one half thickness of axle sleeve and processed, groove gradient is 30~35 °.
1.2 by zinc-plated heavy grinding roller with lathe by first step axis be processed into its angle of outslope mouth be 30~35 °, second
The purpose of rank axis opens Z-type groove, opens Z-type groove is built-up welding welding transition layer.The effect of transition zone are as follows: 802 surfacing welding of cobalt-based
Tissue is austenite and eutectic, and the stainless structure of steel of 316L is similar, when the roller surface that sinks carries out built-up welding, due to journal diameter
Greatly, itself rigidity is strong, and is in free state, and generation welding stress is little, and transition zone substantially belongs to the set welding of cobalt chromium tungsten again
It in homogeneity, solves many unfavorable factors of different steel weld, generates larger weldering when overcoming 316L and cobalt-chromium-tungsten alloy set welding
Power is scooped out, the mechanical foundation of weld cracking is reduced, in the 316L steel sinking roller axle journal side built-up welding cobalt chromium repeatedly used
Tungsten alloy forms high temperature and is not easy by the transition zone of zine corrosion, and zinc can not penetrate into weld seam, improve weld seam heat resistanceheat resistant crackle with it is resistant to high temperatures
Intercrystalline corrosion ability caused by zinc liquid.
1.3 at zinc-plated sinking roller second step axis built-up welding transition zone, weld seam transition layer height 4-6mm, the built-up welding number of plies 2~
3 layers, weld bead height is less than 4mm or 2 layer and using effect is not achieved, and is greater than 6mm or 3 layer, and welding difficulty increases, and the cost of overhaul increases
Add.
1.3.1 by 802 φ 3.2mm of No. 1 surfacing welding of cobalt-based 150 DEG C bake one hour it is spare.
1.3.2 it welds: 400 welding machine DC reverse connection of ZX7-, with 802 welding rod φ 3.2mm of drying in 316L groove face heap
Weldering, electric current 110A are welded using short arc, and welding rod is swung laterally, and reaching groove and slightly stopping makes sufficiently to fuse.First layer is soldered clearly
It manages clean welding slag, the defects of pore-free, slag inclusion, if defective, is cleaned out with electric angle grinder, weld again and examine qualification
After weld the second layer, electric current 125A welds third layer after being soldered second layer passed examination, and electric current 120A, totally three layer heaps are soldered.
Further, in step 1.3.2, interlayer temperature is excessively high to cause heat affected area coarse grains, so that weld seam is strong
Degree and low-temperature impact toughness decline, still, interlayer temperature is lower than preheating temperature, is easy to crack during welding, because
This, preferably, the interlayer temperature of weld seam is more than or equal to preheating temperature, and is less than or equal to 65 in step 1.3.2
℃。
Further, it in step 1.3.2, is often soldered after one section and is hammered immediately with the hand hammer with round end.First hammering weldering
Seam middle part, then weld seam two sides are hammered, reach until being covered with point, to eliminate part stress and change tensile stress as compression.Hammering
Afterwards with 10 times of lens examination surface, continue welding after confirming zero defect.Since temperature reduces, hammer effect is reduced, and welds
The middle part of seam is main position easy to crack, therefore, first hammers the middle part of weld seam, utmostly eliminates stress in the middle part of weld seam and this its
Tensile stress is compression.
Further, preferably, electric current when electric current when first layer welding bead welding is greater than other layers of welding bead welding；The
Speed is migrated when migrating speed less than other layers of welding bead welding when one layer of welding bead welding.By increasing welding electric current and reduction
Speed is migrated, is achieved the purpose that fully penetrated.It is subject to the welding sequencing of welding bead, each layer welding bead is successively named as first layer
Welding bead, second layer welding bead, it is known that n-th layer welding bead, N are equal to the number of plies of welding bead；And the definition about inner and outer is, first welding
The inside positioned at rear welding, the outside for being located at first welding of rear welding.More toward outer layer, the width of welding bead is bigger, and is all made of
The welding rod of 2.5mm, in order to make outer layer welding bead meet width requirement and quality requirement, preferably, second layer welding bead and second
For welding bead on the outside of layer welding bead in welding, the travelling route of welding rod is continuous swing horizontal position welding.
Further, in order to guarantee the mechanical property of weld seam, preferably, the post annealing layer on the outside of the last layer welding bead
Weld seam.
Further, after step 1.3.2, when due to welding, commissure temperature can reach material boiling point, and welding rod from
Opening is, commissure temperature sharply under near room temperature, this uneven temperature can generate residual stress and deformation, in order to eliminate temperature
Influence jumpy, it is preferred that weld seam slow cooling is made extremely with the speed less than or equal to 100 DEG C/h after step 1.3.2
Room temperature；
1.3.3 30~40 ° of grooves of single side V-type for being grinding into 4 × 4 with electric angle grinder are spare.
2 erection weldings:
The harmful substances such as the greasy dirt in the weld seam two sides region 50mm are cleaned out in the assembly of 2.1 axle sleeves afterwards in place, with cobalt-based welding rod
802 φ 3.2mm electric current 120A are evenly distributed with 3 points of spot welding 10mm, with fixed hub and sinking roller.
2.2 welding: 400 welding machine DC reverse connection of ZX7-, with 802 welding rod φ 3.2mm built-up welding of drying, electric current 115A is used
The defects of short arc welding, welding rod are swung laterally, and first layer, which is soldered, cleans out welding slag, dyeing inspection pore-free, slag inclusion, if having
Defect is cleaned out with electric angle grinder, welds and weld after the assay was approved the second layer again, and electric current 125A is soldered second layer inspection
Third layer is welded after looking into qualification, electric current 120A, totally three layer heaps are soldered；Every layer of dyeing inspection, confirmation do not have the defects of crackle；
Further, in step 2.2, interlayer temperature is excessively high to cause heat affected area coarse grains so that weld strength and
Low-temperature impact toughness decline, still, interlayer temperature is lower than preheating temperature, is easy to crack during welding, therefore, makees
To be preferred, in step 2.2, the interlayer temperature of weld seam is more than or equal to preheating temperature, and is less than or equal to 65 DEG C.
Further, it in step 2.2, is often soldered after one section and is hammered immediately with the hand hammer with round end.First hammer weld seam
Middle part, then weld seam two sides are hammered, reach until being covered with point, to eliminate part stress and change tensile stress as compression.After hammering
With 10 times of lens examination surface, continue welding after confirming zero defect.Since temperature reduces, hammer effect is reduced, and weld seam
Middle part be main position easy to crack, therefore, first hammer the middle part of weld seam, utmostly eliminate the stress in the middle part of weld seam and its drawing
Stress is compression.
Further, preferably, electric current when electric current when first layer welding bead welding is greater than other layers of welding bead welding；The
Speed is migrated when migrating speed less than other layers of welding bead welding when one layer of welding bead welding.By increasing welding electric current and reduction
Speed is migrated, is achieved the purpose that fully penetrated.It is subject to the welding sequencing of welding bead, each layer welding bead is successively named as first layer
Welding bead, second layer welding bead, it is known that n-th layer welding bead, N are equal to the number of plies of welding bead；And the definition about inner and outer is, first welding
The inside positioned at rear welding, the outside for being located at first welding of rear welding.More toward outer layer, the width of welding bead is bigger, and is all made of
The welding rod of 3.2mm, in order to make outer layer welding bead meet width requirement and quality requirement, preferably, second layer welding bead and second
For welding bead on the outside of layer welding bead in welding, the travelling route of welding rod is continuous swing horizontal position welding.
Further, in order to guarantee the mechanical property of weld seam, preferably, the post annealing layer on the outside of the last layer welding bead
Weld seam.
Further, after step 2.2, when due to welding, commissure temperature can reach material boiling point, and welding rod leaves
Be, commissure temperature sharply under near room temperature, this uneven temperature can generate residual stress and deformation, in order to eliminate temperature urgency
The influence of drastic change, it is preferred that make weld seam slow cooling to room temperature with the speed less than or equal to 100 DEG C/h after step 2.2.
Finally, penetrant inspection adds magnetic powder inspection double check, weld seam zero defect is confirmed.
Claims (10)
1. a kind of construction method in zinc-plated sinking roller shaft end composite bush, it is characterised in that: the construction method with
Based on the connection of groove is machined with to welding line, bushing (1) is combined to the axis of zinc-plated sinking roller (2) by welding
It holds (3),
Wherein, weld seam is carried out when the bushing (1) to be welded to shaft end (3) of the zinc-plated sinking roller (2), before weldering pre-
Heat carries out the hot isothermal holding of moisture eliminating frame to wlding, and the interlayer temperature of welding, inspection are controlled in weldering and eliminates lacking for welding process
The sunken and cooling combined weld seam of postwelding temperature control and its neighboring area neutralize to improve the intensity of composite weld, reduce welding process
The defect that postwelding generates on composite weld.
2. the construction method according to claim 1 in zinc-plated sinking roller shaft end composite bush, it is characterised in that: institute
The groove stated is double V-groove.
3. the construction method according to claim 2 in zinc-plated sinking roller shaft end composite bush, it is characterised in that: institute
The support shaft (4) for stating zinc-plated sinking roller (2) is the T-type axis with a frustum (5), and the frustum (5) is the T-type axis
Horizontal sides, the bushing (1) be the T-type bushing with an end plate (6), on the lateral wall of frustum small end have one layer with
The identical transition zone (7) of bushing (6) material, the double V-groove between the end plate (6) and the frustum (5) is by end plate (6)
Half double V-groove on half double V-groove and the transition zone (7) respective end in corresponding side is constituted.
4. the construction method according to claim 3 in zinc-plated sinking roller shaft end composite bush, it is characterised in that: cone
The transition zone (7) on platform small end lateral wall is the overlay cladding that built-up welding acquisition is carried out after machining Z-type groove.
5. the construction method according to claim 4 in zinc-plated sinking roller shaft end composite bush, it is characterised in that:
It is completed when overlay cladding described in built-up welding using multi-pass welding built-up welding, when built-up welding first preheats welding bead, in welding process
Interlayer temperature is not less than preheating temperature, but is no more than 65 DEG C；The thickness of every layer heap layer is no more than 4 ㎜；Carrying out each welding bead
Built-up welding when, every built-up welding is completed to be no more than carry out Welding Residual Stress Relieving by Hammer Peening after the weld seam of an electrode length after carry out down again
The built-up welding of one section of welding.
6. the construction method according to claim 5 in zinc-plated sinking roller shaft end composite bush, it is characterised in that: logical
During crossing two to the three layer heaps weldering sublayer built-up welding acquisition overlay cladding, carried out respectively after the completion of each layer heap weldering sublayer
Color flaw detection confirmation zero defect rear carries out the overlay-operation of next layer heap weldering sublayer, after carry out again after the completion of whole overlay-operations
Post-weld annealed operation is carried out again after dye penetrant inspection confirmation zero defect.
7. the construction method according to claim 6 in zinc-plated sinking roller shaft end composite bush, it is characterised in that: move back
After the completion of fire operation, the weld seam after making annealing is remained less than or the cooling rate slow cooling equal to 100 DEG C/h is to room temperature.
8. for the construction method in zinc-plated sinking roller shaft end composite bush according to claim 5,6 or 7, feature exists
In: during welding the sublayer built-up welding acquisition overlay cladding by two to three layer heaps, the welding current of first layer built-up welding is greater than it
The welding current of its each layer；And in Welding Residual Stress Relieving by Hammer Peening, by first tapping in the middle part of weld seam, then gradually toward the suitable of both ends
Sequence, which eliminate, answers hammering operation.
9. the construction method according to claim 8 in zinc-plated sinking roller shaft end composite bush, it is characterised in that: heap
Weldering uses the cobalt-based welding rod of φ 2.5mm, and Combined Welding uses the cobalt-based welding rod of φ 3.2mm, 150 DEG C of bakings in drying box before weldering
One hour and keep the temperature it is used as needed, welding operation when using DC reverse connection operate.
10. the construction method according to claim 2 or 3 in zinc-plated sinking roller shaft end composite bush, feature exist
In: in the shaft end of bushing (1) and zinc-plated sinking roller (2), the angle of single double V-groove of processing is 30~35 °.
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| CN116638256B (en) * | 2023-07-16 | 2024-05-10 | 江苏亚太特种铸钢厂有限公司 | Machining process for stabilizing roller with mechanical safety protection structure |
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| CN110343986B (en) | 2021-06-08 |
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