CN105177317A - Feeding process for rectangular smelting section of titanium or titanium-alloy electron beam cold bed furnace - Google Patents
Feeding process for rectangular smelting section of titanium or titanium-alloy electron beam cold bed furnace Download PDFInfo
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- CN105177317A CN105177317A CN201510561133.0A CN201510561133A CN105177317A CN 105177317 A CN105177317 A CN 105177317A CN 201510561133 A CN201510561133 A CN 201510561133A CN 105177317 A CN105177317 A CN 105177317A
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Abstract
The invention discloses a feeding process for a rectangular smelting section of a titanium or titanium-alloy electron beam cold bed furnace. The feeding process comprises the following steps: stopping feeding after determining a section which needs feeding, shutting off an electronic gun which is responsible for scanning a smelting region, a refining region and a casting region of the electron beam cold bed furnace after all materials are molten until no molten metal at a pouring gate flows to a crystallizer of the electron beam cold bed furnace; keeping a length position of cast ingot unchanged, and keeping a liquid surface position in the crystallizer; starting performing feeding; if the feeding position is the head of the cast ingot, recovering the size of a pattern scanned by the electronic gun which is responsible for scanning the crystallizer after the feeding is completed, recovering scanning power of the electronic gun, shutting on the electronic gun which is responsible for the smelting region, the refining region and the casting region, and directly casting after the operation of the electronic gun is stable; and when the feeding position is the tail of the cast ingot, directly shutting off the electronic gun. The feeding process disclosed by the invention is simple in design, convenient in operation, good in using effect, and capable of effectively solving defects appearing in head and tail of rectangular plate blank, thereby greatly improving once yield of the cast ingot.
Description
Technical field
The present invention relates to the electron-beam cold bed furnace rectangle melting section Feeding field of titanium or titanium alloy.
Background technology
For the vacuum consumable smelting (VAR) of titanium or titanium alloy, at the end of melting soon, generally need to carry out feeding to reduce the degree of depth of ingot casting afterbody shrinkage cavity, improve the lumber recovery of ingot casting.Existing feeding technology generally adopts and reduces fusion current step by step, carries out in the mode of small area analysis insulation.This feeding technology is adopted to need to calculate residue electrode weight when feeding starts, every grade of electric current, voltage and time etc.Because the parameter such as electric current, voltage, vacuum tightness during every stove melting can fluctuate, when easily causing every stove titanium or titanium alloy melting feeding, the residue electrode weight occurred is inadequate, feeding terminates in advance, the shrinkage cavity scope fluctuation of its ingot casting is larger, or more at residue electrode weight, the ingot casting lumber recovery of this stove is declined.Finally affect into the lumber recovery of ingot casting.In follow-up production, also need to carry out to strip off the skin, the operation such as cogging forging, the lumber recovery of product can be made greatly to decline.
Adopt continuous casting technology direct production can go out ingot casting blank for following process, cogging forging of still needing after avoiding VAR melting, secondary such as to strip off the skin at the operation, simultaneously owing to adopting the ingot casting specification of continuous casting casting large, greatly can improve the lumber recovery of ingot casting.But adopt this explained hereafter strand, its depth-width ratio is large, and due to the many Bian Constraint Cooling Technology of ingot casting outside surface, causes hull-skin temperature too low, easily crack in appearance.These drawbacks limit rectangular billet CC is to the development of more big cross section size (thickness G reatT.GreaT.GT400mm).Thickness be the thick and large section continuous cast round billets of more than 400mm exist equally internal shrinkage loose with surface crack etc. macroscopic defects.
Electron-beam cold bed furnace smelting technique is different from traditional vacuum consumable electrode arc furnace melting and continuous casting technology, and smelting zone and casting area cold bed separate by it, while conveniently can realizing the casting of melting limit, limit, realizes " feeding " while also can realizing casting.But easily the impurity of crystallizer inwall and gas are involved in ingot casting head at casting initial stage molten metal and form pore (bubble), if and after casting terminates, do not carry out feeding (insulation), be easy to form the casting flaw such as rising head, section cracking.The way that general employing crop truncates, to eliminate the impact of this defect on following process, but adopts this method, the lumber recovery of ingot casting can be made greatly to decline.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art, a kind of lumber recovery reducing ingot casting crop, back-end crop amount, raising electron-beam cold bed furnace melting strand is provided, solve the defects such as rectangular cross-section strand internal shrinkage, loose and section breach, improve the casting head of slab, the titanium of the casting quality of afterbody or the electron-beam cold bed furnace rectangle melting section feeding technology of titanium alloy.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
An electron-beam cold bed furnace rectangle melting section feeding technology for titanium or titanium alloy, the method comprises the following steps:
(1) that determines electron-beam cold bed furnace ingot casting needs feeding section, and defining method is, is defined as ingot casting head by starting the face of casting to the long 100mm of ingot; After the melting cold bed of electron-beam cold bed furnace all added by the material of charging basket, confirm the position that now ingot is long, cast length is defined as ingot casting afterbody within the long 150mm of tail end face;
(2) stop charging, after material all melts, the electron beam gun of responsible sweep beam cold hearth smelting zone, fining cell and casting area cuts out, until pouring gate plows the crystallizer to electron-beam cold bed furnace without metal liquid stream; Keep the extension position of ingot casting constant, maintain liquid level position in crystallizer;
(3) start to perform feeding, the electron beam gun scanning pattern of responsible sweep beam cold hearth crystallizer is adjusted, adjustment order is " one horizontal two vertical three translations ", namely first scanning pattern widthwise size is adjusted, again its longitudinal size is adjusted, finally horizontal translation adjustment is carried out to scanning position; Described transverse direction is the width of ingot casting, is longitudinally the thickness direction of ingot casting;
(4) if feeding position is ingot casting head, after feeding completes, recover the electron beam gun scanning pattern size being responsible for scanning crystallizer, recover the scan power of its electron beam gun, and open the scanning pattern of electron beam gun of responsible smelting zone, fining cell and casting area, after electron beam gun is stable, directly cast; If feeding position is ingot casting afterbody, then directly close electron beam gun.
The order of the electron beam gun scanning pattern closedown of smelting zone, fining cell, casting area described in above-mentioned steps (2) is for first closing smelting zone, closing fining cell again, and finally close casting area, turn-off time interval is not less than 20s.
The scanning pattern size of the recovery electron beam gun described in above-mentioned steps (4), the order of recovery for first to recover translation, then is recovered longitudinally, finally recovers laterally; The order that scanning pattern is opened for first to open casting area, then opens fining cell, finally opens smelting zone, the power decision that the time of opening is loaded by the liquid fluidity on cold bed and electron beam gun.
Present invention process is simple, easy to operate, result of use is good, effectively can solve the defect of rectangular slab head, afterbody appearance, as pore, shrinkage cavity, end face breach etc., the removal amount of ingot casting head is down to below 30mm by 100 original ~ 110mm, and 30 ~ 40mm that the removal amount of ingot casting afterbody is come by reason becomes without the need to cutting.Substantially increase the once lumber-preserving rate of ingot casting, obvious economic interests can be obtained.
Embodiment
Embodiment 1
The electron-beam cold bed furnace ingot casting rectangle melting section feeding technology of titanium or titanium alloy, comprises the following steps:
(1) that determines electron-beam cold bed furnace ingot casting needs feeding section.For specification be 1050 × 210mm, feeding position is the ingot casting of ingot casting afterbody, defining method is, is defined as ingot casting head by starting the face of casting to the long 100mm of ingot; After the melting cold bed of electron-beam cold bed furnace all added by the material of charging basket, confirm the position that now ingot is long, cast length is defined as ingot casting afterbody within the long 150mm of tail end face;
(2) feed system of system is closed, stop charging, after material all melts, observe the mobility status of melting cold bed overflow head piece place metal liquid, when overflow port place flows out without metal liquid, close and be responsible for 1 of smelting zone (Melting)
#electron beam gun, when fining cell (Refine) flows out without metal liquid with casting area (Overflow) place, then cuts out 2 of responsible scanning fining cell
#electron beam gun, finally cuts out and is responsible for 3 of scanning casting area
#electron beam gun, turn-off time interval is not less than 20s, until pouring gate plows the crystallizer to electron-beam cold bed furnace without metal liquid stream; Now, keep the extension position of ingot casting constant, maintain liquid level position in crystallizer;
(3) start to perform feeding technology, replenish shrink process is as shown in table 1, the electron beam gun scanning pattern of responsible electron-beam cold bed furnace scanning crystallizer is adjusted, adjustment order is " one horizontal two vertical three translations ", namely first scanning pattern widthwise size is adjusted, again its longitudinal size is adjusted, finally horizontal translation adjustment is carried out to scanning position; Described transverse direction is the width of ingot casting, is longitudinally the thickness direction of ingot casting;
(4), after feeding completes, close and be responsible for 4 of scanning crystallizer
#electron beam gun.
Table 1 feeding technology plan
In table 1, a is feature size coefficient, and b is scanning position coefficient, and c is spot size coefficient, and d is graphic width coefficient, and "-" represents closedown, and " 0 " represents original state.
Embodiment 2
The electron-beam cold bed furnace ingot casting rectangle melting section feeding technology of titanium or titanium alloy, comprises the following steps:
(1) that determines electron-beam cold bed furnace ingot casting needs feeding section.With specification for 1380 × 210mm, the ingot casting of example (melting is interrupted in burst, is undertaken connecing ingot by feeding technology) that to be ingot casting head be in feeding position is example, and defining method is, is defined as ingot casting head by starting the face of casting to the long 100mm of ingot; After the melting cold bed of electron-beam cold bed furnace all added by the material of charging basket, confirm the position that now ingot is long, cast length is defined as ingot casting afterbody within the long 150mm of tail end face;
(2) when the ingot casting head length of casting is 80mm, the feed system of system is closed, stop charging, after the material on cold bed all melts, observe the mobility status of melting cold bed overflow head piece place metal liquid, when overflow port place flows out without metal liquid, close and be responsible for 1 of smelting zone (Melting)
#electron beam gun, when fining cell (Refine) flows out without metal liquid with casting area (Overflow) place, then cuts out 2 of responsible scanning fining cell
#electron beam gun, finally cuts out and is responsible for 3 of scanning casting area
#electron beam gun, turn-off time interval is not less than 20s, until pouring gate plows the crystallizer to electron-beam cold bed furnace without metal liquid stream; Now, keep the extension position of ingot casting constant, maintain liquid level position in crystallizer;
(3) start to perform feeding technology, replenish shrink process is as shown in table 2, the electron beam gun scanning pattern of responsible electron-beam cold bed furnace scanning crystallizer is adjusted, adjustment order is " one horizontal two vertical three translations ", namely first scanning pattern widthwise size is adjusted, again its longitudinal size is adjusted, finally horizontal translation adjustment is carried out to scanning position; Described transverse direction is the width of ingot casting, is longitudinally the thickness direction of ingot casting;
(4) after feeding completes, recover to be responsible for 4 of scanning crystallizer
#electron beam gun scanning pattern size, recovers the scan power of its electron beam gun, and opens 1 of responsible scanning smelting zone
#2 of electron beam gun, responsible scanning fining cell
#electron beam gun and be responsible for scanning casting area 3
#the scanning pattern of electron beam gun, after electron beam gun is stable, opens the electron beam gun of smelting zone, directly casts after continuing melting.Recover the order of the recovery of electron beam gun scanning pattern size for first to recover translation, then recover longitudinally, finally recover laterally; The order that scanning pattern is opened for first to open casting area, then opens fining cell, finally opens smelting zone, the power decision that the time of opening is loaded by the liquid fluidity on cold bed and electron beam gun.
Table 2 feeding technology plan
Remarks: a is graphic length coefficient, and b is scanning position coefficient, and c is spot size coefficient, and d is graphic width coefficient, and "-" represents closedown, and " 0 " represents original state
Electron-beam cold bed furnace of the present invention is prior art equipment.
The present invention is by carrying out feeding to the section of ingot casting base, and shrinkage cavity and the end face of elimination ingot casting head, tail ftracture, and improve loose.
Claims (3)
1. an electron-beam cold bed furnace ingot casting rectangle melting section feeding technology for titanium or titanium alloy, is characterized in that, comprise the following steps:
(1) that determines electron-beam cold bed furnace ingot casting needs feeding section, and defining method is, is defined as ingot casting head by starting the face of casting to the long 100mm of ingot; After the melting cold bed of electron-beam cold bed furnace all added by the material of charging basket, confirm the position that now ingot is long, cast length is defined as ingot casting afterbody within the long 150mm of tail end face;
(2) stop charging, after material all melts, the electron beam gun of responsible sweep beam cold hearth smelting zone, fining cell and casting area cuts out, until pouring gate plows the crystallizer to electron-beam cold bed furnace without metal liquid stream; Keep the extension position of ingot casting constant, maintain liquid level position in crystallizer;
(3) start to perform feeding, the electron beam gun scanning pattern of responsible sweep beam cold hearth crystallizer is adjusted, adjustment order is " one horizontal two vertical three translations ", namely first scanning pattern widthwise size is adjusted, again its longitudinal size is adjusted, finally horizontal translation adjustment is carried out to scanning position; Described transverse direction is the width of ingot casting, is longitudinally the thickness direction of ingot casting;
(4) if feeding position is ingot casting head, after feeding completes, recover the electron beam gun scanning pattern size being responsible for scanning crystallizer, recover the scan power of its electron beam gun, and open the scanning pattern of electron beam gun of responsible smelting zone, fining cell and casting area, after electron beam gun is stable, directly cast; If feeding position is ingot casting afterbody, then directly close electron beam gun.
2. the electron-beam cold bed furnace rectangle melting section feeding technology of titanium according to claim 1 or titanium alloy, it is characterized in that, the order of the electron beam gun scanning pattern closedown of smelting zone, fining cell, casting area described in step (2) is for first closing smelting zone, closing fining cell again, finally close casting area, turn-off time interval is not less than 20s.
3. the electron-beam cold bed furnace rectangle melting section feeding technology of titanium according to claim 1 or titanium alloy, it is characterized in that, the scanning pattern size of the recovery electron beam gun described in step (4), the order of recovery is for first to recover translation, recover longitudinally again, finally recover laterally; The order that scanning pattern is opened for first to open casting area, then opens fining cell, finally opens smelting zone, the power decision that the time of opening is loaded by the liquid fluidity on cold bed and electron beam gun.
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| CN107760878A (en) * | 2016-08-19 | 2018-03-06 | 宁波创润新材料有限公司 | The method of smelting of ingot casting |
| CN108220612A (en) * | 2018-01-19 | 2018-06-29 | 青海聚能钛业股份有限公司 | Zircaloy processing method is recycled in a kind of electron-beam cold bed furnace melting |
| CN109868389A (en) * | 2019-01-09 | 2019-06-11 | 青海聚能钛业股份有限公司 | A method of utilizing hot-cathode electric beam cold hearth melting TA2 ingot casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109868389A (en) * | 2019-01-09 | 2019-06-11 | 青海聚能钛业股份有限公司 | A method of utilizing hot-cathode electric beam cold hearth melting TA2 ingot casting |
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