CN106216625A - A kind of electromagnetic centrifugal is combined the method preparing high speed steel roll ring - Google Patents
A kind of electromagnetic centrifugal is combined the method preparing high speed steel roll ring Download PDFInfo
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- CN106216625A CN106216625A CN201610805728.0A CN201610805728A CN106216625A CN 106216625 A CN106216625 A CN 106216625A CN 201610805728 A CN201610805728 A CN 201610805728A CN 106216625 A CN106216625 A CN 106216625A
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- roll
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- centrifugal
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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
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/08—Centrifugal casting; Casting by using centrifugal force in which a stationary mould is fed from a rotating mass of liquid metal
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Abstract
The present invention provides a kind of electromagnetic centrifugal to be combined the method preparing high speed steel roll ring, in roll sleeve casting cycle, the rotary electromagnetic field of horizontal direction is applied outside roll sleeve mould, the Lorentz force utilizing electromagnetic field makes roll sleeve metal liquid solidification process high speed rotate, promote precipitation strength the most radially distribution gradient in high-speed steel process of setting, i.e. improve the quantity of roller shell outer layer precipitation strength phase, and due to the centrifugal force of centrifugal rotation, make roller shell the most closely knit, the most only refine hardening constituent, the effect of crystal grain thinning, also there is elimination solidified structure defect as loose, pore, the advantages such as slag inclusion is mingled with；For the mold rotating centrifugal of prior art is compound, the roller shell outer layer of roller core shaft, mold and solidification that the present invention uses is fixing, the centrifugal action of high speed rotating is applied to only liquid or semi-solid metal, improve the stability of casting cycle, it is also beneficial to improve casting quality, eliminates the mold and roller shell problem of Cracking caused because of mechanical vibration.
Description
Technical field
The invention belongs to the preparing technical field of high-speed steel roll, prepare high-speed steel particularly to a kind of electromagnetic centrifugal is compound
The method of roll sleeve.
Background technology
Roll is a large amount of crucial wearing pieces consumed in Rolling production, and its quality directly influences steel rolling product quality, labor
Dynamic productivity ratio and production cost etc.；In high-speed steel containing the high carbide of a large amount of hardness (such as WC:HV2400 2600, VC:
HV2600—3000、Mo2C:HV1500) wearability is better than rich chromium cast iron, and, high speed steel substrate is organized as toughness and preferably returns
Fire martensite and a small amount of austenite, have more preferable toughness than hard alloy, be not likely to produce crackle, and therefore, high-speed steel has become one
Plant the important material for preparing the i.e. roll sleeve of roll working lining.
At present, the preparation method of high speed steel roll ring mainly has: centrifugal casting composite algorithm, continuously casting (CPC) are combined
Method, electroslag remelting composite algorithm (ESR) etc.；The common drawback of CPC method and ESR method is complex process, productivity ratio is low, lumber recovery is low and
Cost is high, and current commercial introduction degree is relatively low；Centrifugal casting composite algorithm has the advantages such as technique is simple, productivity ratio is high, low cost, is
Prepare the topmost method of composite roll at present；In current centrifugal casting composite algorithm drives die cavity by the high speed rotating of mold
The rotation of molten metal realizes centrifugal casting, and its major defect is to be acted on by mechanical stress during mold centrifugal rotation, right
Mold and the roll metal just solidified produce impact, inevitably cause cracking and other coagulation defects；It addition, pass at present
The mold rotating centrifugal casting of system, owing to mold and interior metal thereof are to rotate with identical angular frequency, therefore, liquid in casting mold
Being that identical angular velocity rotates between metal and the shell solidified, solidification front circumferential speed is equal, is static the most relatively,
This causes solidification front easily to form cancellated precipitated phase, destroys the continuous structure of collective, particularly carbonization in high-speed steel
Thing precipitated phase is the most, and the appearance of net carbide is the most fatal problem for high-speed steel roll.
The problem existed for existing mold rotating centrifugal Cast High Speed Steel Roll roller shell, proposes in prior art in rotation
Turn and outside mold, apply magnetic field, i.e. control to reduce the formation of carbide by outfield；Chinese patent (application number:
200410004744.7, electromagnetic centrifugal casting quick-cutting steel composite roller method) and Chinese patent (Authorization Notice No.:
CN100500919C) all propose to apply magnetic field outside casting mold, produce the effect of electromagnetic agitation and reduce alloying element and carbide
Gross segregation, but this technology is still based on mold high speed rotating and realizes apocarpy, the electromagnetic agitation that steady magnetic field causes
Alloying element and carbide thereof can be weakened in roll segregation radially, but too increase the instability of equipment rotary course
Property, the magnetic field mold to rotating produces interference, causes mold vibration to result in new problem.
Summary of the invention
It is an object of the invention to provide a kind of high speed steel roll ring preparation method utilizing electromagnetic field to realize centrifugal casting,
Solve current casting mold to rotate and realize that the ratio of defects that centrifugal casting exists is high, net carbide is many and accident rate is high, high in cost of production
Problem.
It is an object of the invention to be realized by following technical proposal:
The present invention provides a kind of electromagnetic centrifugal to be combined the method preparing high speed steel roll ring, comprises the steps:
(1) the casting mold die cavity of casting high speed steel roll ring is made up of the roller core shaft fixed and roll sleeve mold, at roller shell
Annular electromagnetic field induction apparatus is disposed outside mould；Because in cast and process of setting, casting mold is static not rotate；Casting mold die cavity
The electromagnetic field that the centrifugal rotation of inner metal liquid is dependent on outside roll sleeve mould disposing realizes；
(2) casting of molten metal in the casting mold die cavity of vertical roll sleeve mould；
(3) the molten metal amount of pouring into reach casting mold die cavity height three/for the moment, open electromagnetic field, until watering full；Institute
The electromagnetic field stated is that the annular electromagnetic field induction apparatus by disposing outside roll sleeve mould produces, and applies the rotation of horizontal direction
Electromagnetic field, the Lorentz force utilizing rotary electromagnetic field to produce in molten metal makes roll sleeve molten metal at cooling and process of setting
High speed rotates；Promote precipitation strength the most radially distribution gradient in high-speed steel process of setting, i.e. improve roller shell outer layer and separate out
The quantity of hardening constituent, and due to the centrifugal pressure of centrifugal rotation, make roller shell metal the most closely knit, the most only refines hardening constituent, thin
Change the effect of crystal grain, also there is elimination solidified structure defect such as loose, pore, slag inclusion are mingled with etc. and act on；Due to whole casting and
In process of setting, the metal of casting mold and solidification is all static, and the most not solidified molten metal is rotating, particularly before solidification
On radially, there is the highest velocity gradient along solid-liquid two-phase region, the angular velocity on the circumference of different radii and circumferential speed
It is different from, so there is no the formation condition of large scale net carbide in solid-liquid two-phase region, which solving existing casting mold and rotating
Two crucial deficiencies that centrifugal casting exists, one is that mould stability improves, and defect and accident rate reduce；Two is that electromagnetic centrifugal produces
Raw high speed disturbance, eliminates the formation condition of net carbide.
(4) after metal solidifies completely in casting mold die cavity, electromagnetic field, teeming appropriate molten metal feeding are closed.
In the method for the present invention, electromagnetic inductor and the Matching installation with casting mold thereof are key factors,
Described annular electromagnetic field induction apparatus by 6 groups of coils in the plane of the roll sleeve mold cylindrical sustained height of roll uniformly
Arranging and constitute, the central axis of 6 groups of coils gathers on the central axis of the roll sleeve mold meeting at roll, the centre bit of electromagnetic inductor
In the center of the roll sleeve mold of roll, coil up and down along respectively with the roll sleeve mold of roll up and down along concordant.
Being passed through the low frequency ac of phase contrast 60 ° in the coil of described annular electro magnetic inductor, the frequency of alternating current is 7-
12Hz, the magnetic induction making casting mold die cavity center produce by the size of regulation input current is 0.1-0.2T.
Compared with prior art, use advantages of the present invention as follows:
1) electromagnetic force is utilized to make molten metal realize the cooling under apocarpy and solidification, with traditional casting mold rotating centrifugal casting
Making and compare, the method advantage of the present invention essentially consists in: in whole casting and process of setting, and the metal of casting mold and solidification is all quiet
Only, the most not solidified molten metal rotating, and particularly solidification front solid-liquid two-phase region has on radially the highest
Velocity gradient, angular velocity and circumferential speed on the circumference of different radii are different from, so not having big chi in solid-liquid two-phase region
The formation condition of very little net carbide, completely eliminates net carbide, and this will increase substantially the service behaviour of roll sleeve.
2) compared with traditional casting mold rotating centrifugal casting, the method advantage of the present invention also resides in: whole casting and solidification
During, the metal of casting mold and solidification is all static, and the stability of equipment improves, owing to the casting caused is impacted in mechanical vibration
Mould, foundry goods cracking and mandrel are solved with roller shell metal composite layer problems of crack.
3) this method remains all technological merits of centrifugal casting, in roll sleeve casting cycle, promotes high-speed steel
Precipitation strength mutually the most radially distribution gradient in process of setting, i.e. improves the quantity of roller shell outer layer precipitation strength phase, and due to from
The centrifugal force that the heart rotates, makes roller shell the most closely knit, the most only refines the effect of hardening constituent, crystal grain thinning, also has elimination solidification
The advantages such as tissue defects is the most loose, pore, slag inclusion are mingled with.
In sum, the method for the present invention had both remained high speed steel roll ring centrifugal casting dense structure, rarefaction defect
The advantage such as few, overcomes again tradition casting mold rotating centrifugal and casts the problems caused, have: high speed steel roll ring matter simultaneously
The many advantages such as amount improves, defect accident rate reduces, cost reduces, simple to operate, controllability is strong, a kind of are worthy to be popularized
Method.
Accompanying drawing explanation
The schematic diagram of Fig. 1 present invention；A-top view, b-profile；
Description of reference numerals:
1-annular electro magnetic inductor；2-coil；3-roll sleeve mold；4-casting mold die cavity；5-roller core shaft；6-casting pressing port；7-
Casting platform and casting mold bed die.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further elaborated.Embodiment be merely to illustrate the present invention rather than with
Any mode limits the present invention.
Embodiment 1
With medium frequency induction melting furnace melting high-speed steel, composition is as shown in table 1.
The high speed steel roll ring composition (weight %) of table 1 embodiment 1 preparation
| Element | C | V | W | Mo | Cr | Zr | B |
| Content | 1.8 | 4.5 | 4.5 | 1.5 | 2.5 | 0.06 | 0.001 |
| Element | Si | Mn | S | P | O | Fe | |
| Content | 0.5 | 0.5 | 0.008 | 0.008 | 0.0010 | Surplus |
According to the method for the present invention, get out casting mold and electromagnetic inductor, and be assembled in casting according to the requirement of this method
On platform, roller core is No. 45 steel steel pipes, and roll sleeve mold is sand mold structure, and shell is stainless steel, pacifies outside roll sleeve mould
The annular electromagnetic field induction apparatus put is evenly arranged in the plane of roll sleeve mould cylindrical sustained height by 6 groups of coils and constitutes, and 6
The central axis of group coil gathers on the central axis meeting at roll sleeve mould, and electromagnetic inductor is centrally located at roller cover die
Tool center, coil up and down along respectively with mould up and down along concordant, be passed through the low of phase contrast 60 ° in electromagnetic inductor coil
Frequently alternating current, the frequency of alternating current is 10Hz, makes, by the size of regulation input current, the magnetic induction that mold cavity center produces
Intensity is 0.15T；
High-speed steel melts and after Casting Equipment debugging, proceeds by casting, first to vertical roll sleeve mould
Casting of molten metal in die cavity, the metal amount of pouring into reach mold heights three/for the moment, open electromagnetic inductor power supply, and
Power frequency is transferred to 10Hz, and magnetic induction is 0.15T, until watering full；After metal solidifies completely in mold, close electromagnetism
Inductor power, teeming appropriate molten metal feeding, casting cycle is complete.
Die sinking after controlling cooling and insulation, prepares finished product through machining after then carrying out heat treatment；For with prior art
Compare, the casting mold rotating centrifugal of the high speed steel prior art of same composition is cast the high speed preparing same size specification
Steel rider set, through identical cast temperature and insulation cooling, uses heat treatment identical with the present embodiment and machining side
Legal system obtains high speed steel roll ring finished product as a comparison case 1, the high-speed steel roll that embodiments of the invention 1 prepare with comparative example 1
The performance of roller shell is shown in Table 2.
The mechanical property of the roll of table 2 embodiment 1 preparation
| Performance | Hardness/(HRC) | Tensile strength/(MPa) | Bending strength/(MPa) | Impact flexibility/(J/cm2) |
| Embodiment 1 | 70 | 1220 | 1180 | 29.3 |
| Comparative example 1 | 65 | 1100 | 980 | 22.4 |
Knowable to performance data contrasts, the performance of high speed steel roll ring prepared by the inventive method is substantially better than existing skill
Art uses the performance of the high speed steel roll ring of casting mold rotating centrifugal casting.
Embodiment 2
With medium frequency induction melting furnace melting high-speed steel, composition is as shown in table 1.
The high speed steel roll ring composition (weight %) of table 3 embodiment 2 preparation
| Element | C | V | W | Mo | Cr | Zr | B |
| Content | 2.4 | 5.5 | 6.0 | 4.3 | 3.6 | 0.16 | 0.003 |
| Element | Si | Mn | S | P | O | Fe | |
| Content | 0.5 | 0.5 | 0.008 | 0.008 | 0.0010 | Surplus |
According to the method for the present invention, get out casting mold and electromagnetic inductor, and be assembled in casting according to the requirement of this method
On platform, roller core is No. 45 steel steel pipes, and roll sleeve mold is sand mold structure, and shell is stainless steel, pacifies outside roll sleeve mould
The annular electromagnetic field induction apparatus put is evenly arranged in the plane of roll sleeve mould cylindrical sustained height by 6 groups of coils and constitutes, and 6
The central axis of group coil gathers on the central axis meeting at roll sleeve mould, and electromagnetic inductor is centrally located at roller cover die
Tool center, coil up and down along respectively with mould up and down along concordant, be passed through the low of phase contrast 60 ° in electromagnetic inductor coil
Frequently alternating current, the frequency of alternating current is 7Hz, and the magnetic induction making mold cavity center produce by the size of regulation input current is strong
Degree is 0.1T；
High-speed steel melts and after Casting Equipment debugging, proceeds by casting, first to vertical roll sleeve mould
Casting of molten metal in die cavity, the metal amount of pouring into reach mold heights three/for the moment, open electromagnetic inductor power supply, and
Power frequency is transferred to 7Hz, and magnetic induction is 0.10T, until watering full；After metal solidifies completely in mold, close electromagnetism
Inductor power, teeming appropriate molten metal feeding, casting cycle is complete.
Die sinking after controlling cooling and insulation, prepares finished product through machining after then carrying out heat treatment；For with prior art
Compare, the casting mold rotating centrifugal of the high speed steel prior art of same composition is cast the high speed preparing same size specification
Steel rider set, through identical cast temperature and insulation cooling, uses heat treatment identical with the present embodiment and machining side
Legal system obtains high speed steel roll ring finished product as a comparison case 2, the high-speed steel roll that embodiments of the invention 2 prepare with comparative example 2
The performance of roller shell is shown in Table 4.
The mechanical property of table 4 embodiment 2 roll
| Performance | Hardness/(HRC) | Tensile strength/(MPa) | Bending strength/(MPa) | Impact flexibility/(J/cm2) |
| Embodiment 2 | 72 | 1280 | 1160 | 28.3 |
| Comparative example 2 | 64 | 1110 | 990 | 24.4 |
Knowable to performance data contrasts, the performance of high speed steel roll ring prepared by the inventive method is substantially better than existing skill
Art uses the performance of the high speed steel roll ring of casting mold rotating centrifugal casting.
Embodiment 3
With medium frequency induction melting furnace melting high-speed steel, composition is as shown in table 5.
The high speed steel roll ring composition (weight %) of table 5 embodiment 3 preparation
| Element | C | V | W | Mo | Cr | Zr |
| Content | 2.2 | 5.5 | 6.0 | 4.3 | 3.6 | 0.16 |
| Element | Si | Mn | S | P | O | Fe |
| Content | 0.5 | 0.5 | 0.008 | 0.008 | 0.0010 | Surplus |
According to the method for the present invention, get out casting mold and electromagnetic inductor, and be assembled in casting according to the requirement of this method
On platform, roller core is No. 45 steel steel pipes, and roll sleeve mold is sand mold structure, and shell is stainless steel, pacifies outside roll sleeve mould
The annular electromagnetic field induction apparatus put is evenly arranged in the plane of roll sleeve mould cylindrical sustained height by 6 groups of coils and constitutes, and 6
The central axis of group coil gathers on the central axis meeting at roll sleeve mould, and electromagnetic inductor is centrally located at roller cover die
Tool center, coil up and down along respectively with mould up and down along concordant, be passed through the low of phase contrast 60 ° in electromagnetic inductor coil
Frequently alternating current, the frequency of alternating current is 12Hz, makes, by the size of regulation input current, the magnetic induction that mold cavity center produces
Intensity is 0.2T；
High-speed steel melts and after Casting Equipment debugging, proceeds by casting, first to vertical roll sleeve mould
Casting of molten metal in die cavity, the metal amount of pouring into reach mold heights three/for the moment, open electromagnetic inductor power supply, and
Power frequency is transferred to 12Hz, and magnetic induction is 0.20T, until watering full；After metal solidifies completely in mold, close electromagnetism
Inductor power, teeming appropriate molten metal feeding, casting cycle is complete.
Die sinking after controlling cooling and insulation, prepares finished product through machining after then carrying out heat treatment；For with prior art
Compare, the casting mold rotating centrifugal of the high speed steel prior art of same composition is cast the high speed preparing same size specification
Steel rider set, through identical cast temperature and insulation cooling, uses heat treatment identical with the present embodiment and machining side
Legal system obtains high speed steel roll ring finished product as a comparison case 3, the high-speed steel roll that embodiments of the invention 3 prepare with comparative example 3
The performance of roller shell is shown in Table 6.
The mechanical property of table 6 embodiment 3 roll
| Performance | Red hardness/(HRC) | Tensile strength/(MPa) | Bending strength/(MPa) | Impact flexibility/(J/cm2) |
| Embodiment 3 | 75 | 1320 | 1240 | 27.6 |
| Comparative example 3 | 62 | 1210 | 1000 | 22.5 |
Knowable to performance data contrasts, the performance of high speed steel roll ring prepared by the inventive method is substantially better than existing skill
Art uses the performance of the high speed steel roll ring of casting mold rotating centrifugal casting.
The high-speed steel centrifugal compound roll that the application present invention manufactures, has carried out commerical test, in the least in hot strip rolling mill
Rice steel transportation amount is all at more than 2000t, and roll campaign increases substantially, it addition, this roll has good Thermal fatigue properties, this
The high speed steel roll of invention is in use without roll breakage, be full of cracks and peeling phenomenon；Therefore, rolling of this invention is applied
Roller, it is possible to decrease roll consumption, improves operating rate of rolling mill, extends the roll change cycle, improve the surface quality of stocking, have good warp
Ji benefit and social benefit.
Claims (3)
1. an electromagnetic centrifugal is combined the method preparing high speed steel roll ring, it is characterised in that:
(1) the casting mold die cavity (4) of casting high speed steel roll ring is made up of, at roller the roller core shaft (5) fixed and roll sleeve mold (3)
Mold (3) disposes outward annular electromagnetic field induction apparatus (1)；
(2) casting of molten metal in the casting mold die cavity of vertical roll sleeve mould (3)；
(3) the molten metal amount of pouring into reach casting mold die cavity height three/for the moment, open electromagnetic field, until watering full；Described
Electromagnetic field is that the annular electromagnetic field induction apparatus (1) disposed outward by roll sleeve mold (3) is produced, and applies the rotating electromagnetic of horizontal direction
, the Lorentz force utilizing rotary electromagnetic field to produce in molten metal makes roll sleeve molten metal high in cooling and process of setting
Speed rotates；
(4) after metal solidifies completely in casting mold die cavity, electromagnetic field, teeming appropriate molten metal feeding are closed.
A kind of electromagnetic centrifugal the most according to claim 1 is combined the method preparing high speed steel roll ring, it is characterised in that:
Described annular electromagnetic field induction apparatus (1) by 6 groups of coils (2) in the plane of roll sleeve mold (3) the cylindrical sustained height of roll all
Even layout is constituted, and the central axis of 6 groups of coils gathers on the central axis of the roll sleeve mold (3) meeting at roll, electromagnetic inductor
Being centrally located at the center of the roll sleeve mold (3) of roll, the edge up and down of coil is flat with the edge up and down of the roll sleeve mold (3) of roll respectively
Together.
A kind of electromagnetic centrifugal the most according to claim 2 is combined the method preparing high speed steel roll ring, it is characterised in that:
Being passed through the low frequency ac of phase contrast 60 ° in the coil (2) of described annular electro magnetic inductor (1), the frequency of alternating current is 7-
12Hz, the magnetic induction making casting mold die cavity center produce by the size of regulation input current is 0.1-0.2T.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610805728.0A CN106216625A (en) | 2016-09-07 | 2016-09-07 | A kind of electromagnetic centrifugal is combined the method preparing high speed steel roll ring |
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| CN201610805728.0A CN106216625A (en) | 2016-09-07 | 2016-09-07 | A kind of electromagnetic centrifugal is combined the method preparing high speed steel roll ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108356244A (en) * | 2018-05-02 | 2018-08-03 | 湖南四昉新材料有限公司 | A kind of pouring device of bimetal roller housing |
| CN110722123A (en) * | 2019-11-29 | 2020-01-24 | 哈尔滨工业大学 | In-situ centrifugal casting equipment and method for alloy casting with thin-wall circular section |
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| JPS5343624A (en) * | 1976-10-01 | 1978-04-19 | Shinko Electric Co Ltd | Method of making tubular casting by utilizing rotatory electromagnetic force |
| JPS6195758A (en) * | 1984-10-18 | 1986-05-14 | Shinko Electric Co Ltd | Apparatus for producing tubular casting |
| JPH04100670A (en) * | 1990-08-20 | 1992-04-02 | Kubota Corp | Method for casting metal pipe |
| CN1559725A (en) * | 2004-02-19 | 2005-01-05 | 清华大学 | Method producing high speed steet composite roller by electromagnetic centrifugal casting |
| CN101705430A (en) * | 2009-11-13 | 2010-05-12 | 江苏大学 | High-speed steel roll and preparation method thereof by centrifugal compounding in electromagnetic field |
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2016
- 2016-09-07 CN CN201610805728.0A patent/CN106216625A/en active Pending
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| JPS5343624A (en) * | 1976-10-01 | 1978-04-19 | Shinko Electric Co Ltd | Method of making tubular casting by utilizing rotatory electromagnetic force |
| JPS6195758A (en) * | 1984-10-18 | 1986-05-14 | Shinko Electric Co Ltd | Apparatus for producing tubular casting |
| JPH04100670A (en) * | 1990-08-20 | 1992-04-02 | Kubota Corp | Method for casting metal pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108356244A (en) * | 2018-05-02 | 2018-08-03 | 湖南四昉新材料有限公司 | A kind of pouring device of bimetal roller housing |
| CN110722123A (en) * | 2019-11-29 | 2020-01-24 | 哈尔滨工业大学 | In-situ centrifugal casting equipment and method for alloy casting with thin-wall circular section |
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