CN107262696B - A kind of interface fusion process prepares the method and device of metal composite pipe - Google Patents
A kind of interface fusion process prepares the method and device of metal composite pipe Download PDFInfo
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- CN107262696B CN107262696B CN201710453605.XA CN201710453605A CN107262696B CN 107262696 B CN107262696 B CN 107262696B CN 201710453605 A CN201710453605 A CN 201710453605A CN 107262696 B CN107262696 B CN 107262696B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/003—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using inert gases
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
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Abstract
The invention discloses the method and devices that a kind of interface fusion process prepares metal composite pipe.The interface fusion process prepares the device of metal composite pipe, the casting pipe die for being 1000:1 including cylindrical a heating pipe die and a taper, the lower end of the heating pipe die connects a wire brush wheel rust remover, the wire brush wheel rust remover bottom of box is connected with the pilot hole at the top of casting pipe die, and wire brush wheel rust remover and the junction of heating pipe die and casting pipe die pilot hole are sealed with heat-proof silica gel.The interface fusion process prepares the method and device of metal composite pipe, chamber is poured using being formed between ceramic mold and matrix tube layer, heating generator can be used to heat matrix tube layer, and ceramic pipe mold has heat accumulation function, the thermal loss of matrix tube layer can be reduced, realize the secondary remelting of compound interface, solving conventional metals mold should not be heated at high temperature, the defect of unsuitable temperature control.
Description
Technical field
The present invention relates to the method and devices that a kind of interface fusion process prepares metal composite pipe.
Background technique
The metallic composites such as composite plate, multiple tube, compound bar refer to using complex technique by it is a variety of chemistry, mechanical properties
Different metals realizes metallurgical bonding and the composite material that is formed on interface, significantly improves the heat of single metal material
Many performances such as dilatancy, intensity, fracture toughness, impact flexibility, wear resistance, electrical property, magnetic property, thus be widely used
To anti-corrosion, pressure vessel manufacturing, electric construction, petrochemical industry, medicine, light industry, automobile and other industries.Metal composite with excellent properties is arrived
On parent plate layer or matrix tube layer, the comprehensive performance of material can not only be made to reach most preferably, and rare metal use can also be saved
Amount reduces the dosage for smelting high quality steel alloy and saves production cost.The metal composite pipe of various performances has extensive need
It asks and applies, for example, steel pipe used in chemicals ship, matrix tube layer has comprehensive mechanics and welding performance, and compound tube layer is anti-corrosion, makes
Multiple tube has both two kinds of performances of common tubing and stainless tubing；Oil and gas pipeline can both have been accomplished external resistance to by complex technique
Salt corrosion, and can accomplish internal halophile and acid corrosion.By taking pressure vessel Stainless Steel Steel Clad Plate as an example, base is with one
As carbon steel (Q245R, Q345R etc.) have good mechanical performance, cladding has good corrosion resistant with stainless steel (304,316L etc.)
Corrosion energy, the two are combined together, it is only necessary to which several millimeters of high price stainless steel substantial saved cost, and not change substantially
The various mechanical performances of substrate.
Currently, the complex method of metal composite pipe mainly has mechanical rolling process, explosion composite method, drawing composite algorithm etc..Make
The composite metal plate or metal composite pipe being prepared with traditional processing technology due to parent plate layer or matrix tube layer with it is compound
The binding force of plate layer or matrix tube layer is insufficient, and especially in composite layer on the matrix pipe relatively thin to tube wall, not only difficulty is big,
Multiple tube length limited, and it is easy to appear breakages in use, lead to safety accident.
Summary of the invention
In order to compensate for the shortcomings of the prior art, the present invention provides one kind in ordinary carbon steel surface recombination alloy-layer, passes through
The compound method and device for making the interface fusion process that interface cohesion is secured, production cost is low prepare metal composite pipe of liquid-liquid.
The present invention is achieved through the following technical solutions:
A kind of method that interface fusion process prepares metal composite pipe, using following steps:
(1) two ceramic pipe dies are taken, wherein a ceramic pipe die is cylindrical heating pipe die, another ceramics pipe die is taper
For the casting pipe die of 1000:1, the internal diameter for heating pipe die is 6mm bigger than stick core diameter, be poured the bottom taper end closure of openings of pipe die and
Taper end opening diameter is slightly larger than the outer diameter of metal composite pipe；The top opening of casting pipe die is covered with ceramic wafer, and in ceramic wafer
Middle part offer the pilot hole of a back taper, the bottom end internal diameter of pilot hole is 1mm bigger than stick core diameter, heats pipe die and gate spool
Mould, pilot hole axis on the same line；The lower end for heating pipe die is connected into a wire brush wheel rust remover, wire brush wheel derusting
Box body bottom is connected with the pilot hole at the top of casting pipe die, and wire brush wheel rust remover and heating pipe die and casting pipe die are oriented to
The junction in hole is sealed with heat-proof silica gel；
(2) stick wicking surface is more smooth, and the grease of stick wicking surface is removed by acid solution, is removed using wire brush mechanical friction
Remove the rust of stick wicking surface；Stick wicking surface has obvious etch pit, and lathe vehicle goes to surface to smooth；The length of stick core is greater than heating
The length of pipe die；
(3) suspension hook is welded at the top of stick core, is hung stick core in heating pipe die by suspension hook；
(4) CO is blown into the cavity between Xiang Jiare pipe die, steel wire sand derusting box body and casting pipe die2Gas makes
CO is full of in above-mentioned cavity2Gas；
(5) casting pipe die top side open up a sprue gate, make heat pipe die, wire brush wheel derusting box body and
A closed cavity is formed between casting pipe die；Calculate the alloying metal liquid dosage that the casting of outer layer alloys layer needs, alloying metal liquid
Dosage be equivalent to alloy-layer fusing after volume, by desired amount of alloying metal liquid at the uniform velocity pour into casting pipe die in, alloy
The temperature of molten metal is 30 DEG C or more of high value in stick core and alloy-layer fusing point；
(6) by stick core, through pilot hole, gradually slow device descending at constant speed is used to while heating the alloying metal liquid in pipe die
Heating generator is heated in the lower end outside of heating pipe die, so that stick wicking surface temperature is reached 20 DEG C of its fusing point or less, simultaneously
Start wire brush wheel rust remover, further removes the oxide skin and other impurities of stick wicking surface after heating；It heats at the top of pipe die
Pilot hole plays guiding role to stick core, is sent into stick core smoothly in casting pipe die；
(7) bottom end to stick core touches the bottom surface of casting pipe die, removes heating pipe die and steel-wire sanding wheel rust remover；Due to
Stick core length is greater than the length of casting pipe die, so when stick core is drop to completely inside casting pipe die, stick core is vertical and stick core
The axis collinear of axis and casting pipe die；During the decline, the alloying metal liquid liquid level being poured in pipe die rises stick core, directly
To stick core is surrounded, after alloying metal liquid solidifies completely, composite bar is obtained；
(8) the composite bar surface temperature obtained to step (7) is down to 700 DEG C, is slowly mentioned by the suspension hook at the top of stick core
Composite bar is played, is deviate from from casting pipe die；
(9) the feeding heating furnace of composite bar obtained in step (8) is heated to 1100-1250 DEG C, come out of the stove；
(10) hollow billet is made in the composite bar perforated unit perforation that step (9) obtains, by hollow billet through sinking sizing mill
Group carries out tube reducing, sizing, shaping；
(11) hollow billet that step (10) obtains is heat-treated, aligned, cut off, examined, obtain surface recombination alloy-layer
Metal composite pipe.
When the fusing point of alloying metal liquid is higher than the fusing point of stick core in step (5), the temperature of alloying metal liquid is alloying metal
30 DEG C of liquid fusing point or more.
When the fusing point of alloying metal liquid is lower than the fusing point of stick core in step (5), the temperature of alloying metal liquid is stick core fusing point
30 DEG C or more.
A kind of interface fusion process prepares the device of metal composite pipe, is including cylindrical a heating pipe die and a taper
The internal diameter of the casting pipe die of 1000:1, the heating pipe die is 6mm bigger than stick core diameter, is poured the bottom taper end closure of openings of pipe die
And taper end opening diameter is slightly larger than the outer diameter of metal composite pipe；The top opening of casting pipe die is covered with ceramic wafer, and in ceramics
The pilot hole of a back taper is offered in the middle part of plate, the bottom end internal diameter of pilot hole is 1mm bigger than stick core diameter, heats pipe die and casting
Pipe die, pilot hole axis on the same line；The lower end of the heating pipe die connects a wire brush wheel rust remover, wire brush wheel
The rust remover bottom of box is connected with the pilot hole at the top of casting pipe die, wire brush wheel rust remover and heating pipe die and casting pipe die
The junction of pilot hole is sealed with heat-proof silica gel；It is connected equipped with one with gate spool mold cavity in the top side of casting pipe die
Pouring basin surround in the lower end outside of heating pipe die and is equipped with a heating generator.
Interface fusion process of the present invention prepares the method and device of metal composite pipe, and (1) is using ceramic mold and matrix tube layer
Between form casting chamber, heating generator can be used to heat matrix tube layer, and ceramic pipe mold has heat accumulation function, can reduce
The thermal loss of matrix tube layer realizes the secondary remelting of compound interface, and solving conventional metals mold should not be heated at high temperature, unsuitable
The defect of temperature control；(2) pouring temperature for passing through rational alloying metal liquid, makes alloying metal liquid pour into basal body pipe layer surface
Afterwards, not only can guarantee melts matrix tube layer outer surface, but also will not all melt, and keeps matrix tube layer and alloying metal liquid depth molten
It closes, guarantee does not occur Interface Cracking phenomenon during the rolling process, and rolling mill practice adjustable range is wider；(3) when particulate metal is poured,
It is poured intracavitary full of CO2, avoid faying face from contacting with air easy to oxidize, oxide occur prevents interface from combining.To sum up, originally
Inventive method simple process, production cost is low, and the matrix tube layer for the metal composite pipe produced and the binding force of alloy-layer are strong,
The quality that ensure that metal composite pipe reduces the security risk in production process.
Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Fig. 1 is the structural diagram of the present invention.
In figure, 1, heating pipe die, 2, casting pipe die, 3, stick core, 4, ceramic wafer, 5, pilot hole, 6, wire brush wheel rust remover,
7, suspension hook, 8, heating generator, 9, pouring basin.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but the present invention is not limited thereto, the system in embodiment
Preparation Method is customary preparation methods, is no longer described in detail.
Embodiment 1:
A kind of method that interface fusion process prepares metal composite pipe, using following steps:
(1) two ceramic pipe dies are taken, wherein a ceramic pipe die is cylindrical heating pipe die 1, internal diameter and length are φ
165mm*1200mm, another ceramics pipe die are the casting pipe die 2 that taper is 1000:1, and internal diameter and length are φ 169mm*
1000mm, and the diameter at butt end for being poured pipe die 2 is φ 170.2mm, the internal diameter for heating pipe die 1 is 6mm bigger than stick core diameter, i.e. cut-off
Diameter is φ 159mm, and the 20# steel pipe of wall thickness 30mm is as stick core；The top opening for being poured pipe die 2 is covered with ceramic wafer 4, and is being made pottery
The middle part of porcelain plate 4 offers the pilot hole 5 of a back taper, and the bottom end internal diameter of pilot hole 5 is 1mm bigger than stick core diameter, i.e. φ
166mm；It heats pipe die 1 and is poured the axis of pipe die 2, pilot hole 5 on the same line；The lower end connection one of pipe die 2 will be heated
Wire brush wheel rust remover 5,6 bottom of box of wire brush wheel rust remover are connected with the pilot hole 5 at 1 top of casting pipe die, wire brush wheel
Rust remover 6 and the junction of heating pipe die 1 and casting 2 pilot hole 5 of pipe die are sealed with heat-proof silica gel；
(2) 3 surface of stick core is more smooth, and the grease on 3 surface of stick core is removed by acid solution, uses wire brush mechanical friction
Remove the rust on 3 surface of stick core；There is obvious etch pit on 3 surface of stick core, and lathe vehicle goes to surface to smooth；The length of stick core 3 is big
In the length of heating pipe die 1；
(3) suspension hook 7 is welded at the top of stick core 3, is hung stick core 3 in heating pipe die 1 by suspension hook 7；
(4) high-purity CO is blown into the cavity between Xiang Jiare pipe die 1,6 cabinet of steel wire sand rust remover and casting pipe die 22
Gas makes in above-mentioned cavity full of CO2Gas, while with 2 to 1000 DEG C of pipe die of casting of Flame of Natural Gas preheating；
(5) sprue gate is opened up in the top side of casting pipe die 2, makes to heat pipe die 1,6 cabinet of wire brush wheel rust remover
And a closed cavity is formed between casting pipe die 2；Calculating the alloying metal liquid dosage that the casting of outer layer alloys layer needs is 20 public
Jin, 2205 steel alloy of melting in AOD furnace at the uniform velocity pour into 20 kilogram of 2205 alloying metal liquid in casting pipe die 2,2205 alloys
Molten metal temperature is 1700 DEG C；
(6) by stick core 3, through pilot hole 5, gradually slow device descending at constant speed makes to while heating the alloying metal liquid in pipe die 1
Lower end outside with heating generator 8 in heating pipe die 1 is heated, and so that 3 surface temperature of stick core is reached 1350 DEG C, is started simultaneously
Wire brush wheel rust remover 6 further removes the oxide skin and other impurities on 3 surface of stick core after heating；It leads at 1 top of heating pipe die
Guiding role is played to stick core 3 to hole 5, is sent into stick core 3 smoothly in casting pipe die 2 and fixed；
(7) bottom end to stick core 3 touches the bottom surface of casting pipe die 2, removes heating pipe die 1 and steel-wire sanding wheel rust remover 6；
Since 3 length of stick core is greater than the length of casting pipe die 2, so stick core 3 is perpendicular when stick core 3 drop to casting 2 inside of pipe die completely
The axis collinear of straight and 3 axis of stick core and casting pipe die 2；Stick core 3 during the decline, be poured pipe die 2 in alloying metal
Liquid liquid level rises, until stick core 3 is surrounded, after alloying metal liquid solidifies completely, obtains composite bar；
(8) the composite bar surface temperature obtained to step (7) is down to 700 DEG C, and the suspension hook 7 by 3 top of stick core is slow
Lift composite bar, deviates from from casting pipe die 2, plasma cut blind pipe end；
(9) the feeding heating furnace of composite metal blank obtained in step (8) is heated to 1100-1250 DEG C, come out of the stove；
(10) the composite bar feeding perforation unit that step (9) obtains is subjected to perforation and hollow billet is made, when which completes
The temperature of composite bar is 1050-1080 DEG C；Hollow billet is subjected to tube reducing, sizing, whole through tube reducing sizing base group at 930-950 DEG C
Shape obtains the hollow billet of specification φ 100mm*12mm*4274mm, composite bed thickness 1.7mm；
(11) hollow billet that step (10) obtains is heat-treated, aligned, cut off, examined, obtain surface recombination alloy-layer
Metal composite pipe, method particularly includes:
(11.1) the hollow billet surface acid-washing de-scaling for obtaining step (10) then wear water quenching to room temperature；
(11.2) 1100 DEG C of solution treatment will be heated rapidly to after step (11.1) treated hollow billet cutting head, then kept the temperature
2 hours；
(11.3) hollow billet that step (11.2) obtains wear water quenching to room temperature；
(11.4) hollow billet obtained to step (11.3) is detected a flaw, is aligned, is scaled, is polished, and obtains surface recombination alloy
The metal composite pipe of layer.
The mechanical index of metal composite pipe made from 1 embodiment 1 of table
| Standard specimen | Yield strength MPa | Tensile strength MPa |
| 1 | 316.8 | 489.2 |
| 2 | 302.1 | 469.3 |
| 3 | 304.3 | 474.4 |
Seen from table 1, metal composite pipe performance made from embodiment 1 meets conjunction and requires.
Embodiment 2:
The present embodiment difference from example 1 is that: the fusing point of alloying metal liquid is higher than the molten of stick core in step (5)
When point, the temperature of alloying metal liquid is 30 DEG C of alloying metal liquid fusing point or more.
Embodiment 3:
The present embodiment difference from example 1 is that: the fusing point of alloying metal liquid is molten lower than stick core in step (5)
When point, the temperature of alloying metal liquid is 30 DEG C of stick core fusing point or more.
As shown in Figure 1, a kind of interface fusion process prepares the device of metal composite pipe, including a cylindrical heating pipe die 1
The internal diameter of the casting pipe die 2 for being 1000:1 with a taper, the heating pipe die 1 is 6mm bigger than 3 diameter of stick core, is poured the bottom of pipe die 2
Portion's taper end closure of openings and taper end opening diameter are slightly larger than the outer diameter of metal composite pipe；It is poured the top opening ceramics of pipe die 2
Plate 4 covers, and offers the pilot hole 5 of a back taper at the middle part of ceramic wafer 4, and the bottom end internal diameter of pilot hole 5 is than 3 diameter of stick core
Big 1mm heats pipe die 1 and is poured the axis of pipe die 2, pilot hole 5 on the same line；The lower end connection of the heating pipe die 2
One wire brush wheel rust remover 6,6 bottom of box of wire brush wheel rust remover are connected with the pilot hole 5 at 2 top of casting pipe die, wire brush
Wheel rust remover 6 is sealed with the junction for heating pipe die 1 and casting 2 pilot hole 5 of pipe die with heat-proof silica gel；In casting pipe die 2
Top side is equipped with a pouring basin 9 being connected with casting 2 inner cavity of pipe die, surround in the lower end outside of heating pipe die 2 and is equipped with one
Heating generator 8.
Claims (4)
1. a kind of method that interface fusion process prepares metal composite pipe, it is characterized in that: including the following steps
(1) two ceramic pipe dies are taken, wherein a ceramic pipe die is cylindrical heating pipe die, another ceramics pipe die is that taper is
The casting pipe die of 1000:1, the internal diameter for heating pipe die is 6mm bigger than stick core diameter, is poured the bottom taper end closure of openings of pipe die and thin
End opening diameter is slightly larger than the outer diameter of metal composite pipe；The top opening of casting pipe die is covered with ceramic wafer, and in ceramic wafer
Middle part offers the pilot hole of a back taper, and the bottom end internal diameter of pilot hole is 1mm bigger than stick core diameter, heats pipe die and gate spool
Mould, pilot hole axis on the same line；The lower end for heating pipe die is connected into a wire brush wheel rust remover, wire brush wheel derusting
Box body bottom is connected with the pilot hole at the top of casting pipe die, and wire brush wheel rust remover and heating pipe die and casting pipe die are oriented to
The junction in hole is sealed with heat-proof silica gel；
(2) stick wicking surface is more smooth, and the grease of stick wicking surface is removed by acid solution, removes stick using wire brush mechanical friction
The rust of wicking surface；Stick wicking surface has obvious etch pit, and lathe vehicle goes to surface to smooth；The length of stick core is greater than heating pipe die
Length；
(3) suspension hook is welded at the top of stick core, is hung stick core in heating pipe die by suspension hook；
(4) CO is blown into the cavity between Xiang Jiare pipe die, steel wire sand derusting box body and casting pipe die2Gas makes above-mentioned sky
It is intracavitary to be full of CO2Gas；
(5) sprue gate is opened up in the top side of casting pipe die, the top side for being poured pipe die is equipped in one and casting pipe die
The pouring basin that chamber is connected makes to heat pipe die, wire brush wheel derusting box body and be poured between pipe die to form a closed cavity；
The alloying metal liquid dosage that the casting of outer layer alloys layer needs is calculated, the dosage of alloying metal liquid is equivalent to the body after alloy-layer fusing
Product is at the uniform velocity poured into desired amount of alloying metal liquid in casting pipe die, and the temperature of alloying metal liquid is that stick core and alloy-layer are molten
30 DEG C or more of high value in point；
(6) by stick core, through pilot hole, gradually slow device descending at constant speed uses high frequency to while heating the alloying metal liquid in pipe die
Heater is heated in the lower end outside of heating pipe die, and heating generator is circumferentially positioned at the lower end outside of heating pipe die, is made
Stick wicking surface temperature reaches 20 DEG C of its fusing point or less, while starting wire brush wheel rust remover, further removes stick core table after heating
The oxide skin and other impurities in face；Pilot hole at the top of heating pipe die plays guiding role to stick core, is sent into stick core smoothly and pours
It infuses in pipe die；
(7) bottom end to stick core touches the bottom surface of casting pipe die, removes heating pipe die and steel-wire sanding wheel rust remover；Due to stick core
Length is greater than the length of casting pipe die, so when stick core is drop to completely inside casting pipe die, stick core is vertical and stick wire mandrel
With the axis collinear of casting pipe die；During the decline, the alloying metal liquid liquid level being poured in pipe die rises stick core, until will
Stick core surrounds, and after alloying metal liquid solidifies completely, obtains composite bar；
(8) the composite bar surface temperature obtained to step (7) is down to 700 DEG C, is slowly lifted by the suspension hook at the top of stick core multiple
Bar is closed, is deviate from from casting pipe die；
(9) the feeding heating furnace of composite metal blank obtained in step (8) is heated to 1100-1250 DEG C, come out of the stove；
(10) hollow billet is made in the perforation of compound bar billet perforated unit that step (9) obtains, by hollow billet through sinking sizing mill group into
Row tube reducing, sizing, shaping；
(11) hollow billet that step (10) obtains is heat-treated, aligned, cut off, examined, obtain the gold of surface recombination alloy-layer
Belong to multiple tube.
2. the method that interface fusion process according to claim 1 prepares metal composite pipe, it is characterized in that: being closed in step (5)
When the fusing point of golden molten metal is higher than the fusing point of stick core, the temperature of alloying metal liquid is 30 DEG C of alloying metal liquid fusing point or more.
3. the method that interface fusion process according to claim 1 prepares metal composite pipe, it is characterized in that: being closed in step (5)
When the fusing point of golden molten metal is lower than the fusing point of stick core, the temperature of alloying metal liquid is 30 DEG C of stick core fusing point or more.
4. interface fusion process according to claim 1 to 3 prepares the device of metal composite pipe, it is characterized in that: including one
The internal diameter of the casting pipe die that cylindrical heating pipe die and a taper are 1000:1, the heating pipe die is 6mm bigger than stick core diameter,
It is poured the bottom taper end closure of openings of pipe die and taper end opening diameter is slightly larger than the outer diameter of metal composite pipe；It is poured the top of pipe die
Opening is covered with ceramic wafer, and the pilot hole of a back taper is offered in the middle part of ceramic wafer, and the bottom end internal diameter of pilot hole compares stick
The big 1mm of core diameter heats pipe die and is poured the axis of pipe die, pilot hole on the same line；The lower end of the heating pipe die connects
A wire brush wheel rust remover is connect, the wire brush wheel rust remover bottom of box is connected with the pilot hole at the top of casting pipe die, wire brush wheel
The junction of rust remover and heating pipe die and casting pipe die pilot hole is sealed with heat-proof silica gel；In the top side of casting pipe die
The pouring basin being connected equipped with one with gate spool mold cavity surround in the lower end outside of heating pipe die and is equipped with a heating generator.
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| JPH0970655A (en) * | 1995-09-08 | 1997-03-18 | Fujikoo:Kk | Member for hot-rolling equipment in iron works excellent in wear resistance and corrosion resistance |
| CN1390663A (en) * | 2002-06-14 | 2003-01-15 | 韩国强 | Equipment and method for casting bimetal roller |
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| CN107262696A (en) | 2017-10-20 |
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Effective date of registration: 20221226 Address after: Room 2016, Building 14, A-2 District, Huazhi Vientiane World, No. 2 Maoling Mountain Road, Jinan, Shandong 250000 Patentee after: Shandong Railway Construction Zhenpin Engineering Management Co.,Ltd. Address before: 250014 Room 601, unit 5, building 12, No. 1-1, District 3, dianliu new village, Lixia District, Jinan City, Shandong Province Patentee before: Sun Jinteng Patentee before: Sun Xuexian |