CN100473751C - Disc shaped roll and producing method thereof - Google Patents
Disc shaped roll and producing method thereof Download PDFInfo
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- CN100473751C CN100473751C CNB2005100751410A CN200510075141A CN100473751C CN 100473751 C CN100473751 C CN 100473751C CN B2005100751410 A CNB2005100751410 A CN B2005100751410A CN 200510075141 A CN200510075141 A CN 200510075141A CN 100473751 C CN100473751 C CN 100473751C
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Abstract
The invention provides a disk roll having excellent wear resistance and seizure resistance by forming a PTA (Plasma Transferred Arc) overlaying layer containing NbC on a surface. A ring member 30 of the disk roll is fixed to a ring fixing tool 11 of a PTA overlaying device 10. After the fixing operation, a surface of the ring member 30 except a surface subjected to the PTA overlaying is wrapped by a heat-insulating sheet 20. After the fixing, the ring fixing tool 11 is turned to perform the PTA overlaying on the surface of the ring member 30. The temperature of the ring member is maintained at 250-350 DEG C. by burners 16A to 16E. After the PTA overlaying, the ring member 30 is fitted to a shaft member by shrink fitting.
Description
Technical field
The present invention relates to disk shaped roll and manufacture method thereof, in more detail, relate to the employed disk shaped roll of perforation milling train and the manufacture method thereof that are used for making footpath seamless tube (external diameter is the seamless tube of 150mm～450mm).
Background technology
Usually, middle footpath seamless tube is made by Mannesmann (Mannesmann) tubulation method.As Figure 15 and shown in Figure 16, in mannesmann process, the perforate on of perforation milling train 70, formation hollow pipe (hollow shell) as the axle center part of round base that is rolled material 4.Hollow shell is handled through elongating mill and shape straightening processing and become seamless tube.
The top 3 that perforation milling train 70 has pair of angled roller 1, a pair of disk shaped roll 2 and is used to bore a hole and is rolled material 4.Pair of angled roller 1 disposes in opposite directions in the mode of clamping the medullary ray (hereinafter referred to as pass center (pass centra) L) that is rolled the service line that material 4 passes through.It is on the position at 90 ° at center that a pair of disk shaped roll 2 is configured in pass center L with respect to pair of angled roller 1.
Be rolled material 4 and carry on the L of pass center, the tilting roller 1 that is rotated is nipped.Being rolled material 4 extrudes to directions X on the one side of spiral rotation on one side by tilting roller 1.At this moment, be rolled material 4, be rolled into hollow shell by top 3 perforation.Along with the carrying out of perforation, the external diameter that is rolled material 4 (hollow shell) increases.
As shown in figure 17, disk shaped roll 2 has curvature on surface 22.In drilling/rolling, while disk shaped roll 2 makes surface 22 contact and rotate with being rolled material 4 (hollow shell), inhibition is rolled the increase of the external diameter of material 4.
What as mentioned above, disk shaped roll 2 bore that in spiral rotation external diameter has increase trend is rolled material 4.Therefore, on surface 22, bear higher surface pressure, produce friction.Under the situation of surface 22 wearing and tearing that cause disk shaped roll 2 because of friction, the become increase of the external diameter that can not suppress to be rolled material 4 of disk shaped roll 2.In addition, when producing on the surface 22 under eccentric wear damage or the agglutinating situation, on the surface that is rolled material 4, produce fault (draw defective).Therefore, the wear-resistant countermeasure of disk shaped roll 2 and anti-bonding countermeasure are very important.In following patent documentation 1 and 2, delivered by adjusting wearing and tearing and the agglutinating method that rolling method suppresses disk shaped roll 2.Yet, do not deliver the wearability and the anti-close-burning method that improve disk shaped roll itself.
; as wear-resistant, anti-agglutinating countermeasure, delivered in contact and be rolled the technology (with reference to following patent documentation 3 and 4) that forms overlay cladding (PTA overlay cladding) on the tool surfaces of material by plasma powder welding method (Plasma Transferred Arc:PTA method).Because the PTA overlay cladding is a high rigidity, so wearability is good.In addition, contact PTA overlay cladding surperficial oxidized by being rolled material with pyritous repeatedly.This oxide film has lubrication, prevents to produce bonding.In a word, the PTA overlay cladding is also very outstanding aspect anti-cohesiveness.Wherein, the instrument with PTA overlay cladding is when bringing into use, and at PTA overlay cladding surface applied lubricant, before forming oxide film, this lubricant can prevent that agglutinating from taking place.Lubricant be rolled repeatedly the contacting of material in peel off from instrument owing to formed oxide film during this, after lubricant was peeled off, oxide film prevented to produce bonding.
As mentioned above, the PTA overlay cladding is good aspect wearability and anti-cohesiveness.In patent documentation 4, the wearability of instrument and anti-cohesiveness are improved by in the PTA overlay cladding, containing NbC.
, the disk shaped roll with the PTA overlay cladding that contains NbC does not from the teeth outwards create so far yet.Employed disk shaped roll 2 is large-scale in the perforation milling train that is used for making the footpath pipe, and diameter is 3200mm～3500mm.When the built-up welding (below be called the PTA built-up welding) on this large-scale disk shaped roll, implemented with the PTA method, in the PTA overlay cladding, be easy to produce thermal stresses, can a lot of crackles of generation on the surface of PTA overlay cladding.When on the PTA overlay cladding, having crackle, worry to produce fault being rolled on the surface of material because of this crackle.In addition, also having the PTA overlay cladding is the situation that starting point is peeled off with the crackle.Therefore, when forming the PTA overlay cladding on disk shaped roll, being necessary to make the crackle of PTA overlay cladding to be suppressed at can practical degree.
In addition, generally in the PTA built-up welding,, on the surface of PTA overlay cladding, produce concavo-convex owing to make the overlapped PTA of formation overlay cladding of welding bead.Concavo-convex existence is the major cause that produces fault on the surface of material being rolled.This is that stress concentration is at protuberance because be rolled the protuberance of material contact welding bead.Therefore, shown in following patent documentation 3 and 4, the surface of general PTA overlay cladding with shredder etc. grind eliminate concavo-convex.Yet on large-scale disk shaped roll, the whole surface that grind the PTA overlay cladding needs for a long time, and simultaneously, cost also increases thereupon.And, for the PTA overlay cladding of lapped face, be the lifetime of the disk shaped roll of polished PTA overlay cladding part at least.Therefore, if consider the life problems that manufacturing cost and amount of grinding cause, preferred use can be carried out abrasive method to the surface of PTA overlay cladding.
Patent documentation 1: the spy opens the 2002-248506 communique
Patent documentation 2: the spy opens the 2001-340904 communique
Patent documentation 3: the spy opens flat 9-85487 communique
Patent documentation 4: the spy opens flat 6-315704 communique
Summary of the invention
The object of the present invention is to provide and a kind ofly make wearability and the good disk shaped roll of anti-cohesiveness by forming the PTA overlay cladding contain NbC from the teeth outwards.
Another object of the present invention is to provide a kind of need not grind and the disk shaped roll that can use the surface of PTA overlay cladding.
The inventor forms the PTA overlay cladding that contains NbC on disk shaped roll, investigated the crack reason of the PTA overlay cladding after forming.Its result, contriver think that the temperature of the disk shaped roll in the PTA built-up welding is the reason that produces the crackle of PTA overlay cladding.The PTA overlay cladding is a high rigidity, lacks ductility.Therefore, when using the disk shaped roll of normal temperature in the PTA built-up welding, the PTA overlay cladding of formation can not expand with the thermal expansion of the disk shaped roll that causes because of welding heat, and cracks.On the other hand, when using the disk shaped roll of preheating in the proper temperature scope, can suppress the thermal expansion of the disk shaped roll that causes because of welding heat.Therefore the PTA overlay cladding that forms is difficult to crack.
Based on above understanding, the holding temperature of the disk shaped roll in the PTA built-up welding is investigated, it found that, if the temperature of disk shaped roll is remained on 250 ℃～350 ℃, then on disk shaped roll, can form can practical state the PTA overlay cladding that contains NbC.Thermal expansion at the disk shaped roll that can not fully suppress below 250 ℃ to cause because of welding heat.In addition, if surpass 350 ℃, then accept the melt surface of disk shaped roll of the electric arc of PTA built-up welding, because disk shaped roll fuses into the hardness reduction that makes the PTA overlay cladding in the PTA overlay cladding.
In addition, the inventor has investigated the concavo-convex of PTA overlay cladding surface.As shown in Figure 1, measured the poor Δ h of the summit of the adjacent welding bead of PTA overlay cladding in the present invention, with the concavo-convex value of Δ h as the concavo-convex state of expression.As shown in Figure 2, the use gauge 500 identical with the curvature of the surperficial 30C of disk shaped roll 50 can be measured concavo-convex value Δ h.
The inventor investigates with the relation that is rolled the fault of material production concavo-convex value Δ h, and it found that, if the concavo-convex value Δ h of PTA overlay cladding is suppressed in the 2mm, then can suppress the generation of fault.Think that this is because by reducing the concavo-convex of PTA overlay cladding surface, be rolled material and contact, alleviated the load that produces at surperficial protuberance with the PTA overlay cladding is whole.
Concavo-convex value Δ h finds in addition, if not more than 0.1mm, then can not prevent the generation of fault.When use has the disk shaped roll of PTA overlay cladding, the use initial stage at the surface applied lubricant.This is for before forming oxide film on the PTA overlay cladding, prevents bonding., if do not have concavo-convexly on PTA overlay cladding surface, then lubricant is peeled off and is produced bonding before forming oxide film.Therefore, concavo-convex value Δ h is necessary more than or equal to 0.1mm.
As described above, if making the concavo-convex value Δ h on the PTA overlay cladding surface of disk shaped roll is 0.1～2.0mm, then can prevent to use the generation that is rolled the material surface fault at initial stage at disk shaped roll.Wherein because there is no need after the PTA built-up welding, the PTA overlay cladding to be ground, so with compare through the situation of grinding, improved the life-span of disk shaped roll.
For the concavo-convex value Δ h with the surface is suppressed at 0.1～2.0mm, the inventor studies the condition of PTA built-up welding.Implement the PTA built-up welding on disk shaped roll, the shape of the welding bead that forms is investigated, its result, the inventor find each weld bead shape difference.
As shown in Figure 3, if will compare having the welding bead BD3 and the BD4 that form on the surface of curvature, then find angle [alpha] BD3＜angle [alpha] BD4.Here, as shown in Figure 4, angle [alpha] be by the tangent line of the intersection point on vertical mean line by swing width W1 and disk shaped roll surface, with the formed angle of sea line.Here, so-called swing width W1 is meant the mobile width that forms the PTA welding gun in the welding bead.Detailed content is narrated in the back.
Get back to Fig. 3, because the angle [alpha] BD4 of the angle [alpha] BD3 of welding bead BD3 and BD4 is different, so welding bead BD3 becomes different shapes with welding bead BD4.Specifically, the summit of the protuberance of the BD4 that angle [alpha] is big is offset to than mean line L4 and more relies on trough side (BD3 side).Angle [alpha] is big more, and the summit of welding bead is just big more with respect to departing from of mean line.Therefore, the contriver thinks, if the angle [alpha] when the PTA built-up welding is controlled in the specialized range, then also can make the shape of the welding bead of formation become identical substantially shape, can adjust the concavo-convex of PTA overlay cladding surface.On the basis of above research, derived (1) formula:
W1×tanα≤1.0mm (1)
In addition, in the PTA built-up welding, make adjacent welding bead overlapping and form the PTA overlay cladding.With reference to Fig. 5, the PTA welding gun is mobile swing width W1 on one side, in paper vertical direction relative to Fig. 5 move on one side, form welding bead BD1.After forming welding bead BD1, the PTA welding gun only translation welding bead translation width W 2.After translation, between swing width W1, move and form BD2 while the position of PTA welding gun after with translation is the center.Finished the PTA overlay cladding by a plurality of welding beads of such formation.
In order to suppress concavo-convex value Δ h, the contriver thinks not only will control angle [alpha], and is necessary welding bead BD1 and the overlapped region S P of welding bead BD2 are adjusted.If overlapped region S P is little, then region S P becomes recessed shape, if overlapped region S P is big, then region S P becomes protruding shape.Therefore, in order to make concavo-convex value Δ h in suitable scope, being necessary to make overlapped region S P is suitable size.In other words, be necessary the ratio of suitable regulation weld width W1 and translation width W 2.
Based on above-mentioned research, derived (2) formula:
0.8≤W2/W1≤1.5 (2)
As mentioned above, the inventor finds that if satisfy (1) formula and (2) formula, then can make concavo-convex value Δ h is 0.1mm～2mm when the PTA built-up welding.The inventor finishes following the present invention based on these understanding.
Disk shaped roll of the present invention is the disk shaped roll that the surface has the overlay cladding that forms by the plasma powder welding method, wherein, the martrix alloy that overlay cladding contains that volume % is 30%～60%, the NbC of particle diameter more than 50 μ m is main carbide and Co base alloy or Ni base alloy are constituted.
Concavo-convex 0.1～the 2mm that is preferably on overlay cladding surface.Here, the so-called concavo-convex concavo-convex value Δ h shown in Figure 1 that is meant.
The manufacture method of disk shaped roll of the present invention is the manufacture method that has the disk shaped roll of overlay cladding on the surface, wherein, while be included in the operation of 250～350 ℃ of preheating disk shaped rolls and keep the temperature of preheating to use the plasma powder welding method on the disk shaped roll surface, to form the operation of overlay cladding, the operation that forms overlay cladding with volume % be 30%～70%, particle diameter is the raw material of PTA overlay cladding at the martrix alloy powder that is constituted based on the carbide of NbC and Co base alloy or the basic alloy of Ni of 50～250 μ m.
Forming overlay cladding operation kind, the swing width W1 of plasma powder welding method and welding bead translation width W 2 preferred satisfied following (1) formula and (2) formulas:
W1×tanα≤1.0mm (1)
0.8≤W2/W1≤1.5 (2)
Wherein, as shown in Figure 4, α be meant by the tangent line of the intersection point on vertical mean line by swing width W1 and disk shaped roll surface, with the formed angle of sea line.
Description of drawings
Fig. 1 is used to illustrate that expression is formed on the sketch of definition of concavo-convex concavo-convex value Δ h of the lip-deep PTA overlay cladding of disk shaped roll of the present invention.
Fig. 2 is the sketch that is used to measure the gauge of concavo-convex value Δ h.
Fig. 3 is the sketch that is used to illustrate the weld bead shape after the PTA built-up welding.
Fig. 4 is the sketch that is used to illustrate as the angle [alpha] definition of the PTA built-up welding condition on disk shaped roll of the present invention.
Fig. 5 is the sketch that is used to illustrate the PTA welding.
Fig. 6 is the stereographic map of structure of the disk shaped roll of expression embodiment of the present invention.
Fig. 7 is the side-view of the PTA build-up welding apparatus of the expression disk shaped roll that is used to make embodiments of the present invention.
Fig. 8 is the front view of PTA build-up welding apparatus shown in Figure 7.
Fig. 9 is the diagram of the peripheral structure of the circle ring part 30 in the expression PTA build-up welding apparatus shown in Figure 8.
Figure 10 is the diagram of an example of the action of expression PTA build-up welding apparatus shown in Figure 8.
Figure 11 is the sketch of action that is used for illustrating the PTA welding gun of PTA built-up welding.
Figure 12 is the sketch that is used to illustrate the action of the PTA welding gun behind Figure 11.
Figure 13 is the sketch that is used to illustrate depth of fusion.
Figure 14 is the sketch that is used to illustrate to the investigation method of the crackle on the surface of the disk shaped roll after the PTA built-up welding.
Figure 15 is the structure diagram of the existing perforation milling train seen from above of expression.
Figure 16 is a structure diagram of representing the perforation milling train shown in Figure 15 seen from the side.
Figure 17 is the structure diagram of the perforation milling train shown in Figure 15 seen from the front of expression.
Embodiment
Below, describe embodiments of the present invention in detail with reference to accompanying drawing.Part identical or suitable among the figure adopts prosign, it is not carried out repeat specification.
1. chemical constitution
The PTA overlay cladding that forms on the surface at disk shaped roll by embodiments of the present invention contains carbide and the martrix alloy based on NbC.
(based on the carbide of NbC)
NbC hardness and scale resistance at high temperature is better than other carbide (WC, TiC etc.).Therefore, contain based on the wearability and the anti-cohesiveness of the PTA overlay cladding of the carbide of NbC good.So-called carbide based on NbC for example is to contain volume % at the carbide more than 50%.The particle diameter of NbC is more than 50 μ m.Wherein, said here particle diameter is meant after mensuration is present in the long diameter and short diameter of carbide in PTA overlay cladding cross section, with (long diameter+weak point diameter)/2 values of obtaining.Long diameter and short diameter are to use opticmicroscope or scanning electronic microscope (SEM) to measure.
If the particle diameter of NbC, then can not fully hinder contacting of the martrix alloy that is rolled in material and the PTA overlay cladding less than 50 μ m, can not prevent bonding.Wish that particle diameter is more than 100 μ m.In addition, making the volumetric ratio based on the carbide of NbC in the PTA overlay cladding is 30%～60%.Volumetric ratio based on the carbide of NbC influences wearability.If less than 30%, then wearability reduces.On the other hand, if be higher than 60%, then the toughness of PTA overlay cladding obviously reduces.Therefore, the part of PTA overlay cladding is peeled off easily in use, lifetime.Volumetric ratio based on the carbide of NbC is preferably 40%～60%.
(martrix alloy)
Martrix alloy is considered the environment for use of disk shaped roll and is adopted Co base alloy good aspect scale resistance and solidity to corrosion or Ni base alloy.
So-called Co base alloy for example is to contain the quality % of Co at the alloy more than 30%.The general stellite (stellite) that uses as the hardening built-up welding material is a Co base alloy.For example, the stellite shown in the table 11, stellite 6, stellite 21, stellite 32 etc. all are equivalent to Co base alloy.
(table 1)
So-called Ni base alloy for example is to contain the quality % of Ni at the alloy more than 30%.Alloy 600, alloy 625, alloy 718, C-276,50Cr50Ni etc. that example is as shown in table 2.
(table 2)
The raw-material disk shaped roll that becomes the PTA overlay cladding can be soft material.This is because can prevent the expansion of hot tearing.For example, can be STKM13A or S45C.
2. manufacture method
Below, the manufacture method of the disk shaped roll of the PTA overlay cladding that has present embodiment from the teeth outwards is described.
With reference to Fig. 6, disk shaped roll 50 is divided into: the spindle unit 40 and the circle ring part 30 that comprise axle 21.When exchange is installed in the disk shaped roll 50 of perforation on the milling train, circle ring part 30 is changed as running stores.Specifically, the circle ring part 30 after the wearing and tearing is taken out from spindle unit 40, new circle ring part 30 is installed on the spindle unit 40 by hot charging.In the present embodiment, on the surperficial 30c of circle ring part 30, implement the PTA built-up welding.The PTA built-up welding uses the PTA build-up welding apparatus to implement.
With reference to Fig. 7～Fig. 9, PTA build-up welding apparatus 10 comprises: annulus stationary fixture 11, positioner (positioner) 12, PTA support 14 and main body 15.
Annulus stationary fixture 11 has: discoideus jig main body portion 110 and eight arm 11A.Each arm 11A equally spaced is configured on the circumference of jig main body portion 110.Each arm 11A clamps circle ring part 30 and is fixing.Specifically, on circle ring part 30, side 30a except the surperficial 30c that carries out the PTA built-up welding and bottom surface 30b are encased by insulation sheet 20.Arm 11A clamps the circle ring part 30 that wraps in the insulation sheet 20.
Annulus stationary fixture 11 among Fig. 8 is sectional views of the VII-VII line among Fig. 7.On arm 11A, be formed with communicating pores 111, in communicating pores 111, insert and be fixed with anchor clamps 11C.Stationary fixture 11C for example is a screw bolt and nut.Each the arm 11A that clamps circle ring part 30 is fastening by stationary fixture 11C institute, clamps circle ring part 30 firmly.
Rotate tilt component 121 and have tilt component 122 and rotating mechanism 123.Tilt component 122 sways transverse axis 120B by the tabular rack pinion of semicircle, be arranged on the unshowned pinion(gear) of figure on the stand 120 by driving.Rotate tilt component 122, make circle ring part 30 be in the state of inclination as shown in figure 10.Thereby, can when the PTA built-up welding, adjust angle [alpha].
Main body 15 has top board 15A and two frameworks 151 and 152.As shown in Figure 7, framework 151 and 152 parallel configurations, as shown in Figure 8, a framework 151 and a part of 152 are fixed on the top board 15A.Have a plurality of wheels 153 in the bottom of framework 151 and 152, below a plurality of wheels 153, be provided with guide rail 160.Main body 15 can move along horizontal direction on guide rail 160.
Main body 15 also has PTA support 14 and PTA welding gun controlling board 145.PTA support 14 and PTA welding gun controlling board 145 are set on the top board 15A.PTA support 14 has PTA pole 141 and PTA welding gun 142.PTA pole 141 is fixed in the horizontal direction, is fixed with PTA welding gun 142 along vertical direction on its front end.As shown in figure 10,, move in the horizontal direction, also can adjust the position of the surperficial 30c of PTA welding gun 142 relative circle ring parts 30 by making main body 15 even circle ring part 30 tilts.
Manufacture method to the disk shaped roll 50 of present embodiment describes.
Beginning encases circle ring part 30 with insulation sheet 20.Then, will be fixed on the annulus stationary fixture 11 by the circle ring part 30 that insulation sheet 20 encases.Then, annulus stationary fixture 11 is installed on the mounting plate 124.At this moment, adjust positioner 12, make the central shaft of circle ring part 30 become horizontality (that is, shown in Figure 8 state).
After having adjusted positioner 12, preheating circle ring part 30.Specifically, rotate mounting plate 124 by electric motor 127 and come tumbler ring parts 30.Circle ring part 30 is heated by nozzle 16 in rotation.At this moment, the temperature of circle ring part 30 remains on 250 ℃～350 ℃.Use is schemed unshowned thermometer and is measured the temperature of circle ring part 30 at interval every specific time, adjusts nozzle 16 based on the result who measures.The firepower of nozzle 16A～16E can strong, in, weak three phases changes.The firepower of nozzle 16A generally is set at " by force ".In addition, the firepower of nozzle 16C and 16D be set at " in ".The firepower of nozzle 16B and 16E begin to be set at " in ", but based on the temperature of disk shaped roll and change.Thermometer is arranged near the PTA welding gun 142, measures temperature every specified time limit.
When the temperature-stable with circle ring part 30 remains on after 250 ℃～350 ℃, on the surperficial 30c of circle ring part 30, form the PTA overlay cladding by the PTA method.As the raw material of PTA overlay cladding, using particle diameter is carbide and the martrix alloy powder based on NbC of 50～250 μ m.Volume % based on the carbide of NbC is 30%～70% of a raw material.Horse Trix powdered alloy is Co base alloy or Ni base alloy.
When in the PTA built-up welding, forming welding bead, determine angle [alpha] and swing width W1 and welding bead translation width W 2 in the mode that satisfies (1) formula and (2) formula.
After definite angle [alpha] and swing width W1 and welding bead translation width W 2, circle ring part 30 is rotated, carry out the PTA built-up welding first time.When circle ring part 30 rotates a circle, as shown in figure 11, on the surperficial 30c of circle ring part 30, form welding bead BD.At this moment, finish the PTA built-up welding in a week.Then, as shown in figure 12, when PTA welding gun 142 only after the translation welding bead translation width W 2, is implemented secondary PTA built-up welding.Similarly, if finish n-1 time, then PTA welding gun 142 only after the translation welding bead translation width W 2, ought be implemented the n time PTA built-up welding.Before implementing the n time PTA built-up welding, confirm whether angle [alpha] n surpasses the angle [alpha] of setting.Under situation about not surpassing, implement the PTA built-up welding.Under angle [alpha] n surpasses the situation of angle [alpha], adjust the position relation of the surperficial 30c and the PTA welding gun 142 of circle ring part 30, make α=0 °.Specifically, as shown in figure 10, the tilt component 122 of positioner 12 is rotated, circle ring part 30 is tilted, make angle [alpha]=0 °.At this moment, main body 15 is moved along horizontal direction, adjust the position of the surperficial 30c of PTA welding gun 142 relative circle ring parts 30.Adjust the back and implement the PTA built-up welding.
As above-mentioned, implement the PTA built-up welding repeatedly, on the surperficial 30c of circle ring part 30, form the PTA overlay cladding that contains NbC in the mode that satisfies (1) formula and (2) formula.The concavo-convex value Δ h of the PTA overlay cladding after the formation can be suppressed at 0.1mm～2.0mm.
After the PTA built-up welding, by hot charging circle ring part 30 is installed on the spindle unit 40, make disk shaped roll 50.
In the PTA built-up welding, prevent the temperature variation of circle ring part 30 by insulation sheet 20, and by a plurality of nozzles are configured on the circumferential direction of disk shaped roll substantially equably, can with the temperature-stable of circle ring part 30 remain on 250 ℃～350 ℃.Therefore, can be suppressed at the generation of the crackle on the PTA overlay cladding.In addition, positioner 12 can change the angle of circle ring part 30, and the angle [alpha] n when making the n time PTA built-up welding is in the angle [alpha] of setting.Thereby, can be suppressed at 0.1mm～2mm to the concavo-convex value Δ h of PTA overlay cladding.
(embodiment 1)
On the surface of disk shaped roll D1～D4 and E1～E4, be formed with the PTA overlay cladding.At this moment, use the NbC of particle diameter 75～150 μ m and the martrix alloy powder in the table 3 as raw material.In disk shaped roll D1～D4, use the martrix alloy D0 in the table 3.In disk shaped roll E1～E4, use the martrix alloy E02 in the table 3.Wherein, the volumetric ratio of the whole relatively raw material of NbC is 50%.
(table 3)
After forming the PTA overlay cladding, the state of investigation PTA overlay cladding.Making disk shaped roll D1～D4, E1～E4 all is that to contain by quality % be the 0.6C-0.2Si-3.0Cr system of C:0.2～2.0%, Si:0.15～0.35%, Cr:3.1～3.5%.
In the plasma powder built-up welding, under the preheating temperature of the disk shaped roll shown in the table 4 and holding temperature, carry out the PTA built-up welding.Wherein, except the temperature in preheating and the PTA built-up welding create conditions all identical.
After making, investigated composition and the NbC particle diameter and the volumetric ratio of the PTA overlay cladding of each disk shaped roll D1～D4, E1～E4.Specifically, in the cross section of overlay cladding, select a plurality of zones.At this moment, the area in the zone of selection adds up to greater than 3mm * 3mm.Use scanning electronic microscope (SEM) to measure particle diameter and the area ratio of selecting the whole carbide in the zone.With the value of (the short diameter of the long diameter+carbide of carbide)/2 as particle diameter.By image analysis measurement particle diameter and area ratio.With the volumetric ratio of the area ratio of obtaining as carbide.The volumetric ratio of verified certain phase equals the area ratio (for example can will Vol10 with reference to Japanese Metallkunde, No.5,279～289 pages) on the cross section.Table 4 has been represented the result of investigation.There is not big difference aspect the composition of the PTA of disk shaped roll D1～D4 overlay cladding.In addition, there be not big difference aspect the composition of the PTA of disk shaped roll E1～E4 overlay cladding.
(table 4)
(evaluation method of PTA overlay cladding)
For the PTA overlay cladding that produces under these conditions, the surperficial crackle and the degree of depth of fusing into have been investigated.The degree of depth that what is called is fused into is meant that the PTA overlay cladding fuses into the raw-material degree of depth of disk shaped roll.Specifically, as shown in figure 13, the depth D EP of the PTA overlay cladding 150 that will fuse into from the surperficial 30C of disk shaped roll 50 is as the degree of depth of fusing into.
(1) investigation of surface crack
With visual observations the PTA surface, investigated the situation of the surface crack that produces on PTA surface.Specifically, the size of the crackle that produces from the teeth outwards and the quantity of the crackle of generation have from the teeth outwards been investigated.
When on the surface of PTA overlay cladding, producing big crackle, this disk shaped roll can not be used to the milling train of boring a hole.This is to be rolled material surface because the shape of crackle is printed on, and is being rolled meeting generation fault on the surface of material.In addition the A/F of the crackle that produces on the disk shaped roll surface is investigated.In each disk shaped roll D1～D4, E1～E4, in the crackle that on the surface of PTA overlay cladding, produces,, when greater than 0.5mm, be evaluated as defective when the maximum open width is evaluated as qualifiedly when 0.5mm is following.
On the other hand, even without the crackle that produces big opening, under the situation that produces a lot of fine cracks, in use, the possibility height that the PTA overlay cladding is peeled off from disk shaped roll.If the PTA overlaying layer stripping, then released part produces fault being rolled on the material.Therefore, can not use the disk shaped roll that produces a large amount of microcracks.Therefore, the crackle number that produces on the disk shaped roll surface is investigated.The crackle number is investigated as following.As shown in figure 14, on ten positions of the optional position on PTA overlay cladding surface, the straight line of drawing 10cm in a circumferential direction, the quantity of adding up the crackle that straight line therewith intersects.Average the quantity of statistics with drawing the collinear number positional.The crackle number is being evaluated as qualifiedly below eight, be evaluated as defective under the situation more than nine.
(2) investigation of depth of fusion
In the PTA built-up welding, it is necessary that the surface of disk shaped roll is melted in the PTA overlay cladding.This is because can guarantee the bonding strength of disk shaped roll and overlay cladding.Disk shaped roll with respect to the bigger situation of the depth of fusion of PTA overlay cladding under, even for example the surface of PTA overlay cladding does not crack, the wearability of PTA overlay cladding also will reduce.Specifically, the attenuation of PTA overlay cladding owing to the material of the disk shaped roll that fuses into, the carbide amount of per unit volume reduces, so the hardness of PTA overlay cladding reduces.And, because the corrosion resisting property of the Fe in the material of disk shaped roll is poor, so fusing into of Fe can cause PTA overlay cladding generation corrosive wear.Therefore, the wearability of PTA overlay cladding reduces.
Here, the PTA overlay cladding depth of fusion of each disk shaped roll D1～D4, E1～E4 is investigated.Specifically, the disk shaped roll main body that will contain the PTA overlay cladding cuts into ten positions along radial direction.Observe with the opticmicroscope pair cross-section, measured the depth of fusion on the starting material surface before the PTA built-up welding.Thinking that depth of fusion is qualified when the above 3.0mm of 0.5mm is following, is defective in addition.When depth of fusion was darker than 3.0mm, wearability worsened, and when not enough 0.5mm, because bonding strength is not enough, worries PTA overlaying layer stripping in use.
(evaluation result)
Table 5 is represented crackle number, crackle size and is fused into the evaluation result of rate.
(table 5)
With reference to table 5, the crackle number of the PTA overlay cladding of disk shaped roll D1 and E1 is defective.Since not enough 100 ℃ of preheating raw material temperature, so on the PTA overlay cladding, produce microcrack.In addition, the PTA overlay cladding depth of fusion of disk shaped roll D4 and E5 is dark, defective.In addition, also produce very big crackle.
On the other hand, for disk shaped roll D2 of the present invention, D3, E2 and E3, crackle number, crackle size and depth of fusion are all qualified.Large-scale disk shaped roll that is to say, even also can form operable PTA overlay cladding.
(second embodiment)
On a plurality of disk shaped rolls, be formed with PTA overlay cladding, investigated based on each disk shaped roll and pipe fault that produces and the bonding that on disk shaped roll, produces with different concavo-convex value Δ h.
(table 6)
Disk shaped roll D5～D14 and E5～E14 implement the PTA built-up welding under the creating conditions of table 6.The martrix alloy that uses in disk shaped roll D5～D14 is as stellite 21.In addition, the martrix alloy that uses in disk shaped roll E5～E14 is as alloy 600.In addition, using particle diameter as raw material is the NbC of 75～125 μ m.Wherein, NbC is 50% with respect to the volumetric ratio of whole raw material.
After implementing the PTA built-up welding, measure the concavo-convex value Δ h of the PTA overlay cladding of each disk shaped roll D5～D14 and E5～E14.Wherein, in order to compare, disk shaped roll D5, D6, E5, E6 carry out grinding and grinding to the surface of PTA overlay cladding, make concavo-convex value Δ h=0.
After measuring concavo-convex value Δ h, each disk shaped roll D5～D14 and E5～E14 are arranged on the perforation milling train.On the surface of disk shaped roll, apply lubricant when being provided with.After being provided with, with five velamens be heated to 1230 ℃ be rolled the material drilling/rolling, make be rolled material become in after the pipe of footpath, investigated the pipe fault that produces on the surface of middle footpath pipe.Be rolled material and use STKM13A steel and SUS304.
Manage the investigation of fault in order to following method.For the STKM13A steel, investigated the degree of depth of the pipe fault that has or not and produce of pipe fault with magnaflux.At this moment, making magnetic concentration is 0.2g/L, and making current value is 5500AT.In addition, for SUS304, after implementing shot-peening, investigate the pipe fault by pickling.Use nitric acid and hydrofluoric acid in pickling, the degree of depth that has or not and manage fault of pipe fault is investigated at the position of the acid accumulator penetration after the pickling by inquiry.
In addition, after drilling/rolling five velamen rolling stocks, whether the PTA overlay cladding of having investigated each disk shaped roll D5～D14 and E5～E14 produces bonding.Confirm to have or not bonding by estimating, when being rolled material transfer, being judged to be and having produced bonding attached to PTA overlay cladding surface.
With reference to Fig. 5, satisfying disk shaped roll D7～D12 of (1) formula and (2) formula and the concavo-convex value Δ h of E7～E12 is 0.1mm～2.0mm.And, on disk shaped roll D7～D12 and E7～E12, do not produce the pipe fault, even perhaps produce the pipe fault, its degree of depth is also in the 0.2mm of allowed band.And, on disk shaped roll D7～D12 and E7～E12, do not produce bonding yet.
On the other hand, in the disk shaped roll D13, the D14 that do not satisfy (1) formula and (2) formula, E13, E14, concavo-convex value Δ h surpasses 2.0mm, and the degree of depth of pipe fault surpasses 0.2mm.Think that because concavo-convex value Δ h surpasses 2.0mm therefore when being rolled material and contacting with the PTA overlay cladding, stress concentration is on the protuberance of PTA overlay cladding, fault is managed in generation.In addition, because stress concentration has taken place, so on disk shaped roll D14 and E14, produced bonding.
On the disk shaped roll D5, the D6 that make concavo-convex value Δ h=0 by surfacing, E5, E6, do not produce the pipe fault.On disk shaped roll D5, E5, produced bonding on the PTA overlay cladding after rolling.Think under the situation of concavo-convex value Δ h=0, before oxide film forms, peel off and produced bonding at the lubricant of use initial stage coating.
More than, embodiments of the present invention are illustrated, above-mentioned embodiment only is used to implement example of the present invention.Therefore, the present invention is not limited to above-mentioned embodiment, in the scope that does not break away from its aim, can carry out suitable variation to above-mentioned embodiment and implement.
Claims (2)
1. disk shaped roll is characterized in that:
Be the disk shaped roll that the surface has the overlay cladding that forms by the plasma powder welding method, wherein,
Described overlay cladding comprises:
Volume % accounts for 30%～60%, particle diameter is that the above NbC of 50 μ m is main carbide, and
The martrix alloy that constitutes by Co base alloy or Ni base alloy,
The concavo-convex value on the surface of described overlay cladding is 0.1～2mm,
Herein, described particle diameter is for by formula (the short diameter of the long diameter+described carbide of described carbide)/2 values of being obtained, and described concavo-convex value is summit poor of the adjacent welding bead of described overlay cladding.
2. the manufacture method of a disk shaped roll is characterized in that:
Be the manufacture method that the surface has the disk shaped roll of overlay cladding, comprise:
In the operation of 250～350 ℃ of preheating disk shaped rolls,
Pass through the plasma powder welding method forms overlay cladding on the surface of described disk shaped roll operation while the temperature that keeps described preheating, wherein,
Form the operation of described overlay cladding,
Be based on volume % account for 30%～70%, particle diameter is the carbide of the NbC of 50～250 μ m, and the martrix alloy powder that is made of Co base alloy or Ni base alloy is as the raw material of PTA overlay cladding,
The swing width W1 of plasma powder welding method and welding bead translation width W 2 satisfy following (1) formula and (2) formula,
W1×tanα≤1.0mm (1)
8≤W2/W1≤1.5 (2)
Herein, described particle diameter is by formula (the short diameter of the long diameter+described carbide of described carbide)/2 values of being obtained,
Swing width W1 is the mobile width of the plasma powder bead welding during welding bead forms,
Angle [alpha] be by the tangent line of the intersection point on vertical mean line by described swing width W1 and described disk shaped roll surface, with the formed angle of sea line.
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| JP2004170183 | 2004-06-08 | ||
| JP2004170183A JP4364064B2 (en) | 2004-06-08 | 2004-06-08 | Disk roll and manufacturing method thereof |
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| WO2007094424A1 (en) * | 2006-02-16 | 2007-08-23 | Sumitomo Metal Industries, Ltd. | Disk roll and method of manufacturing seamless pipe using the same |
| JP2008246549A (en) * | 2007-03-30 | 2008-10-16 | Sumitomo Metal Ind Ltd | Squeeze roll for butt welding of electric resistance welded tube and method of manufacturing the same |
| JP5787543B2 (en) * | 2011-02-15 | 2015-09-30 | 株式会社クボタ | Overlay welding structure |
| CN104278268B (en) * | 2013-07-10 | 2018-04-20 | 上海宝钢工业技术服务有限公司 | The preparation method of zinc pot roll sleeve and bushing protective coating |
| JP6289713B1 (en) * | 2017-06-12 | 2018-03-07 | 南海鋼材株式会社 | Welding system and welding method |
| KR102028618B1 (en) * | 2017-08-11 | 2019-10-04 | 주식회사 포스코 | End coupling of spindle and this reinforcing method |
| CN107457510B (en) * | 2017-08-15 | 2019-04-26 | 贵港捷盛机械有限公司 | A kind of high stability roller surface Bead weld repair equipment |
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