CN103866130A - Method for melting titanium scraps and pure titanium wastes of thin titanium plates by electron beam cold hearth melting furnace - Google Patents
Method for melting titanium scraps and pure titanium wastes of thin titanium plates by electron beam cold hearth melting furnace Download PDFInfo
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Abstract
The invention discloses a method for melting titanium scraps and pure titanium wastes of thin titanium plates by an electron beam cold hearth melting furnace, and relates to methods for melting pure titanium by electron beam cold hearth melting furnaces. The method comprises the following steps: preparing raw materials; selecting and proportioning; mixing by a mixer; vacuumizing and melting the vacuumized raw materials by the electron beam cold hearth melting furnace to obtain slab ingot formed by recovering and melting the wastes. According to the method, the utilization rate of the block-shaped titanium wastes is effectively increased, the process is simplified, the cost is reduced, high-and-low-density impurities in the wastes are effectively removed, and the waste recovering and melting quality is improved.
Description
Technical field
The present invention relates to the method for the pure titanium of electron beam cold hearth melting stove melting, specifically the present invention relates to the method with electron beam cold hearth melting stove cold hearth melting technology melting titanium bits and the pure titanium waste material of thin titanium board.
Background technology
Known, titanium is a kind of metallic element, be widely used in the every field such as oil, chemical industry, metallurgy, electric power, boats and ships owing to having compared with high intensity and resistance toheat, due to the price comparison costliness of titanium, it is the necessary approach that each titanium processing enterprise controls cost that titanium is carried out to waste recovery; Existing conventional smelting technique is mainly, by vacuum arc fumace (VAR), the waste material of titanium is reclaimed to melting, this method is mixed with titanium sponge after not only needing that block titanium waste material is broken into bits shape, after must being pressed into again electrode block, weld, weld and just can carry out vacuum arc fumace (VAR) melting, not only the processing charges of raw material is higher, and the ratio using while being pressed into electrode is also restricted, operation is also comparatively complicated, and titanium waste utilization rate is lower; Be difficult to remove because the high/low density in titanium waste material is mixed in the melting of VAR stove, chemical component fluctuation is large, greatly reduces the quality of titanium waste recovery.
Summary of the invention
In order to overcome the deficiency in background technology, the invention discloses the method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, described method is passed through after titanium bits and the pure titanium waste material pulverizing of thin titanium board, mode and titanium sponge by rotary drum material loading carry out batch mixing, using electron-beam cold bed furnace is slab ingot by the raw material melting after vacuumizing, the present invention has effectively improved the utilization ratio of block titanium waste material, shorten technical process, not only reduce cost, effectively the high/low density removed in waste material be mingled with, and improved the quality of waste recovery melting.
Realize technical scheme of the present invention as follows:
By the method for electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, described method comprises raw material preparation, chooses batching, mixer batch mixing, vacuumizes and use the raw material after electron-beam cold bed furnace melting vacuumizes, to obtain the slab ingot of waste recovery melting, concrete operation step is as follows:
1) raw material preparation:
A, utilize pulverizer to pulverize in pure titanium titanium bits, titanium bits are pulverized specification < 50mm, and carry out magnetic separation dedusting; Be that the pure titanium sheet metal that is less than 4mm utilizes sheet shears to shear pulverizing by thickness, the specification that thin titanium board is sheared is for being less than 100x100mm;
B, connect previous step, the pure titanium waste material after the pulverizing of obtaining in previous step is carried out packing in titanium sponge bucket after pickling, degreasing, cleaning, oven dry, every barrel of indicated weight 100kg, at the outside mark of the titanium sponge bucket trade mark, date manufactured and weight, for subsequent use;
2) choose batching:
A, connect previous step, once select 4 with interior ad eundem and the chemical composition titanium sponge batch close with hardness, and choose the titanium bits after pulverizing or pulverize after thin plate;
B, connect previous step, titanium dioxide material bag of every barrel of preparation of raw material, and wrap the corresponding weight of mark at titanium dioxide material, the titanium sponge during according to batch mixing batch is chosen corresponding material bag and is carried out batch mixing;
3) mixer batch mixing:
A, connect previous step, material loading: utilize hydraulic pressure barrel handling carrier that titanium sponge bucket is put to mixer roller-way, and utilize the automatic turning mechanism of mixer that the raw material in titanium sponge bucket is poured in elevating hopper, elevating hopper rises to the opening for feed of batch mixing rotating cylinder below from ground level, elevating hopper base plate is opened into swash plate automatically, raw material enters in batch mixing rotating cylinder by swash plate, mixer rotating cylinder rotates 3-5 second, raw material is shakeout, then the titanium dioxide material bag that belongs to this barrel of counterweight is evenly sprinkled in raw material, the raw material of remaining titanium sponge barreled is according to above method feeding in continuous material;
B, connect previous step, batch mixing: all after material loadings, the front and back material of rotary drum blender mixer mouthful need be covered with cover plate, to prevent that titanium dioxide powder dirt from overflowing, rotating cylinder is just transferring batch mixing to, overturns as discharging, mixing time is 3-6 minute, and mixing time is expired rotating cylinder after 3-6 minute and automatically stopped;
C, connect previous step, discharging: after rotating cylinder batch mixing stops, titanium sponge bucket is put to discharge port funnel below and connected material, after material is full, presses and stop discharging button, removed with hydraulic pressure barrel handling carrier, then connect next bucket, discharging divides to be carried out for three times, is respectively charged in 3 titanium sponge buckets;
D, connect previous step, sealing: for preventing the air-breathing moisture absorption of titanium sponge, after batch mixing finishes, by titanium sponge bucket good seal, and mark batch mixing lot number on bung;
4) vacuumize:
Connect previous step, by rotary drum venting, and material mixed 6-10 bucket is packed in rotary drum and vacuumized by feeding cart, each feeding in raw material all needs to re-start venting subsequently, and material loading, is evacuated to (1～8) × 10
-2pa; By the working chamber of electron-beam cold bed furnace, feed compartment with draw ingot chamber to be evacuated to (1～8) × 10
-2pa, then opens and draws ingot chamber plate valve, will draw ingot heelpiece to rise up in water jacketed copper crucible;
5) use the raw material after electron-beam cold bed furnace melting vacuumizes:
A, connect previous step, confirm the working order of electron beam gun: open 1#, 2#, 3#, 4#, 5#, 6# electron beam gun, select " positioning of beam " step, readability and the angle of each electron beam gun working order and stroboscope are confirmed;
B, connect previous step, connect previous step, preheating: the GIP of 1#, 2#, 3#, 4#, 5#, 6# electron beam gun is adjusted to " preheating " step and the titanium scull in fusing cold bed, refining cold bed or overflow cold bed is carried out to slow preheating it is slowly expanded;
C, connect previous step, testing current: treat to form molten bath passage on titanium scull, start the GIP of 1#, 2#, 3#, 4#, 5#, 6# rifle to be adjusted to " testing current step ", the emission maximum electric current that can reach electron beam gun is tested;
D, connect previous step, continue melting: by 1,2, the GIP of 3# electron beam gun is adjusted to " continuing melting " step, utilizes large electric current that raw material is molten into titanium liquid;
E, connect previous step, fill crucible: treat that titanium liquid flow to crucible place, by 4,5, the GIP of 6# electron beam gun is adjusted to " filling crucible " step, by crucible heelpiece fill full after, by 4,5,6# electron beam gun GIP is adjusted to after " continuing melting " step, starts automatically ingot pulling to the length needing;
F, connect previous step, close 1#, 2#, 3#, 4# electron beam gun: to the length needing, close 1#, 2#, 3#, 4# electron beam gun until automatically ingot pulling, stay 5#, 6# electron beam gun;
G, connect previous step, clear limit: 4#, 5#, 6# electron beam gun GIP are adjusted to " clear limit " step and use dedicated scan figure to clear up crucible runner and crucible limit portion;
H, connect previous step, heat-sealing top: 4#, 5#, 6# electron beam gun GIP are adjusted to " heat-sealing top " step slab ingot top is sealed to top;
I, connect previous step, after heat-sealing top, all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing the indoor cooling 6-10 of ingot hour, and then blow-on venting, goes out ingot.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, the inwall of the pulverizer described in step 1 is stainless steel plate.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, in the step of batch mixing described in step 2, feed intake at most three barrels, method for mixing is that two barrels of titanium sponges (500Kg/1 bucket) add one barrel of raw material (100Kg/1 bucket), one barrel of titanium sponge (250Kg/1 bucket) after pulverizing and add one barrel of raw material (100Kg/1 bucket) after pulverizing or the interpolation of different ratios at every turn.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, in described batch mixing step, every three barrels while carrying out batch mixing, wherein any two barrels of titanium sponges are selected the titanium sponge of different batches.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, electron-beam cold bed furnace described in step 5 comprises six electron beam gun, the work area of described electron beam gun is distributed as: 1#, 2# electron beam gun work area are melting cold bed, 3#, 4# electron beam gun are refining cold bed, 5#, 6# electron beam gun are overflow cold bed and 1#2# crystallizer, described 1#, 2#, 3# electron beam gun be by the GIP time variable control of 1# computer, and described 4#, 5#, 6# electron beam gun are by the GIP time variable control of 2# computer.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, in the lasting melting step in step 5, the temperature of crucible titanium liquid is 190-200 ℃.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, the model of described electron-beam cold bed furnace is EBCHR 6/200/3600.
By above-mentioned disclosure, the invention has the beneficial effects as follows:
Method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board of the present invention, described method is passed through after titanium bits and the pure titanium waste material pulverizing of thin titanium board, mode and titanium sponge by rotary drum material loading carry out batch mixing, using electron-beam cold bed furnace is slab ingot by the raw material melting after batch mixing, the present invention adds the ratio that reclaims waste material up to 17%-29%, realizing two ingot melting output is 13.5 tons/day, reclaimed materials addition reaches 3.9 tons, the present invention effectively raises organic efficiency and speed, shorten technical process, reduce cost, the slab chemical composition of simultaneously producing through batch mixing is even, the chemical composition big ups and downs of having avoided direct melting reclaimed materials to cause, effectively the high/low density removed in waste material be mingled with, and improve the quality of waste recovery melting.
Slab ingot chemical Composition Control can reach the regulation of following table 1.
Table 1
Embodiment
Can explain in more detail the present invention by the following examples, the present invention is not limited to the following examples; Disclose object of the present invention and be intended to protect all changes and improvements in the scope of the invention.
By the method for electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, described method comprises raw material preparation, chooses batching, mixer batch mixing, vacuumizes and use the raw material after electron-beam cold bed furnace melting batch mixing, to obtain the slab ingot of waste recovery, concrete operation step is as follows:
1) raw material preparation:
A, utilize pulverizer to pulverize in pure titanium titanium bits, titanium bits are pulverized specification < 50mm, and carry out magnetic separation dedusting; Be that the pure titanium sheet metal that is less than 4mm utilizes sheet shears to shear pulverizing by thickness, the specification that thin titanium board is sheared is for being less than 100x100mm;
B, connect previous step, the pure titanium waste material after the pulverizing of obtaining in previous step is carried out packing in titanium sponge bucket after pickling, degreasing, cleaning, oven dry, in the titanium sponge bucket outside mark trade mark and date manufactured, for subsequent use;
2) choose batching:
A, connect previous step, once select 4 with interior ad eundem and the chemical composition titanium sponge batch close with hardness, and choose the titanium bits after pulverizing or pulverize after thin plate;
B, connect previous step, a titanium dioxide material bag of every barrel of preparation, and wrap the corresponding weight of mark at titanium dioxide material, the titanium sponge during according to batch mixing batch is chosen corresponding material bag and is carried out batch mixing;
3) mixer batch mixing:
A, connect previous step, material loading: utilize hydraulic pressure barrel handling carrier that titanium sponge bucket is put to mixer roller-way, and utilize the automatic turning mechanism of mixer that the raw material in titanium sponge bucket is poured in elevating hopper, elevating hopper rises to the opening for feed of batch mixing rotating cylinder below from ground level, elevating hopper base plate is opened into swash plate automatically, raw material enters in batch mixing rotating cylinder by swash plate, mixer rotating cylinder rotates 3-5 second, raw material is shakeout, then the titanium dioxide material bag that belongs to this barrel of counterweight is evenly sprinkled in raw material, remaining titanium sponge bucket is according to above method feeding in continuous material; Whether first barrel of titanium sponge bucket needs first raw material to be thrown in mixer material loading hopper, need secondary check reclaimed materials qualified, otherwise directly the raw material in hopper is risen up in rotating cylinder, and utilize the discharging functions of rotating cylinder that particle is poured out in launch process;
B, connect previous step, batch mixing: all after material loadings, the front and back material of rotary drum blender mixer mouthful need be covered with cover plate, to prevent that titanium dioxide powder dirt from overflowing, rotating cylinder is just transferring batch mixing to, overturns as discharging, mixing time is 3-6 minute, and mixing time is expired rotating cylinder after 3-6 minute and automatically stopped;
C, connect previous step, discharging: after rotating cylinder batch mixing stops, titanium sponge bucket is put to discharge port funnel below and connected material, after material is full, presses and stop discharging button, removed with hydraulic pressure barrel handling carrier, then connect next bucket, discharging divides to be carried out for three times, is respectively charged in 3 titanium sponge buckets;
D, connect previous step, sealing: connect previous step, for preventing the air-breathing moisture absorption of titanium sponge, after batch mixing finishes, by titanium sponge bucket good seal, and mark batch mixing lot number on bung;
4) vacuumize:
Connect previous step, by rotary drum venting, and material mixed 6-10 bucket is packed in rotary drum and vacuumized by feeding cart, each feeding in raw material all needs to re-start venting subsequently, and material loading, is evacuated to (1～8) × 10
-2pa; By the working chamber of electron-beam cold bed furnace, feed compartment with draw ingot chamber to be evacuated to (1～8) × 10
-2pa, then opens and draws ingot chamber plate valve, will draw ingot heelpiece to rise up in water jacketed copper crucible;
5) use the raw material after electron-beam cold bed furnace melting vacuumizes:
A, connect previous step, confirm the working order of electron beam gun: open 1#, 2#, 3#, 4#, 5#, 6# electron beam gun, select " positioning of beam " step, readability and the angle of each electron beam gun working order and stroboscope are confirmed;
B, connect previous step, connect previous step, preheating: the GIP of 1#, 2#, 3#, 4#, 5#, 6# electron beam gun is adjusted to " preheating " step and the titanium scull in fusing cold bed, refining cold bed or overflow cold bed is carried out to slow preheating it is slowly expanded;
C, connect previous step, testing current: treat to form molten bath passage on titanium scull, start the GIP of 123456# rifle to be adjusted to " testing current step ", the emission maximum electric current that can reach electron beam gun is tested; By testing current, can confirm the working order of electron beam gun under large electric current, avoid because of the electron beam gun slab quality problem that job insecurity causes under large electric current;
D, connect previous step, continue melting: by 1,2, the GIP of 3# electron beam gun is adjusted to " continuing melting " step, utilizes large electric current that raw material is molten into titanium liquid; The temperature of crucible titanium liquid is 190-200 ℃; Continuing melting step is to continue under the state of charging, the processing step that raw material is melted, and this process figure arranges and optimizes, and has directly determined melting rate, and has optimized to improve melting efficiency by electron beam gun scanning pattern;
E, connect previous step, fill crucible: treat that titanium liquid flow to crucible place, by 4,5, the GIP of 6# electron beam gun is adjusted to " filling crucible " step, flow at titanium liquid under the state of crucible, the scanning process step of electron beam gun to crucible, this step is arranged and is optimized by electron beam gun scanning pattern, can control the superheating temperature of crucible titanium liquid and the surface quality of slab ingot; By crucible heelpiece fill full after, by 4,5,6# electron beam gun GIP is adjusted to after " continuing melting " step, starts automatically ingot pulling to the length needing; This step has improved the quality of filling slab ingot in crucible process, avoid must excising slab ingot afterbody because of quality problems, after adopting this step, slab ingot afterbody only needs a small amount of excision, continue the melting speed that melting step has improved 1#, 2#, 3# electron beam gun, the energy of 5#, 6# rifle, by calculating, has guaranteed that the superheating temperature of crucible titanium liquid is 200 ℃, has guaranteed steel slab surface good quality simultaneously and has reduced inner grain size; Continuing in fusion process, in " continuing melting " step, 56# rifle has special clear edge graph shape, constantly crucible limit portion is scanned, and forms condensation product and is mingled with, thereby have influence on the internal soundness of slab to prevent that the titanium condensation product of limit portion growth from falling in crucible.This figure calculates and can directly scan on copper crucible through energy, and can not hurt copper crucible; If continue in fusion process, because causing melting, Equipment interrupts, 123# electron beam gun GIP is adjusted to " preheating " step, 456# electron beam gun GIP is adjusted to " continuous heating step is interrupted in melting ", 56# rifle is to slab top continuous heating.Calculate through energy, can guarantee that in crucible, titanium liquid keeps rational superheating temperature, after equipment recovers, then continue melting, and cutout seam crossing does not affect the quality of final titanium ingot, this step has not only been eliminated the impact of cutout on slab ingot quality, has also avoided the defect ware causing because of cutout.
F, connect previous step, close 1#, 2#, 3#, 4# electron beam gun: to the length needing, close 1#, 2#, 3#, 4# electron beam gun until automatically ingot pulling, stay 5#, 6# electron beam gun;
G, connect previous step, clear limit: 4#, 5#, 6# electron beam gun GIP are adjusted to " clear limit " step and use dedicated scan figure to clear up crucible runner and crucible limit portion;
H, connect previous step, heat-sealing top: 4#, 5#, 6# electron beam gun GIP are adjusted to " heat-sealing top " step slab ingot top is sealed to top;
I, connect previous step, after heat-sealing top, all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing the indoor cooling 6-10 of ingot hour, and then blow-on venting, goes out ingot.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, the inwall of the pulverizer described in step 1 is stainless steel plate.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, in the step of batch mixing described in step 2, feed intake at most three barrels, method for mixing is that two barrels of titanium sponges (500Kg/1 bucket) add one barrel of raw material (100Kg/1 bucket), one barrel of titanium sponge (250Kg/1 bucket) after pulverizing and add one barrel of raw material (100Kg/1 bucket) after pulverizing or the interpolation of different ratios at every turn.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, in described batch mixing step, every three barrels while carrying out batch mixing, wherein any two barrels of titanium sponges are selected the titanium sponge of different batches, to reach the uniform effect of slab adult chemical composition.
The described method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, electron-beam cold bed furnace described in step 5 comprises six electron beam gun, the model of described electron-beam cold bed furnace is 6/200/3600, EBCHR represents electron-beam cold bed furnace, 6 represent 6 electron beam gun, 200 represent 200000 liters of/second speed of evacuations, and 3600 represent the maximum electron beam gun power of 3600KW; The work area of described electron beam gun is distributed as: 1#, 2# electron beam gun work area are melting cold bed, 3#, 4# electron beam gun are refining cold bed, 5#, 6# electron beam gun are overflow cold bed and 1#2# crystallizer, described 1#, 2#, 3# electron beam gun are by the GIP time variable control of 1# computer, described 4#, 5#, 6# electron beam gun are by the GIP time variable control of 2# computer, and described 1# computer and the GIP program of 2# computer are set respectively electron beam gun step.
embodiment 1: general T A1 melting
Starting material: 0 grade of titanium sponge+17%TA1 pulverizes titanium bits
Equipment: EBCHR 6/200/3600 type electron-beam cold bed furnace.
The chemical composition of slab ingot is defined as shown in table 2.
Table 2
Actual melting technology:
A. raw material preparation: utilize pulverizer (pulverizer inwall is stainless steel plate, to prevent that iron rust from polluting) to pulverize in pure TA1 titanium titanium bits, titanium bits are pulverized specification < 50mm, and carry out magnetic separation dedusting.
B. batching: choose 2 barrels 0 grade titanium sponge (250kg) and 1 barrel of TA1 and pulverize titanium and consider (100kg/ bucket) to be worth doing, drop into successively and carry out batch mixing in mixer.Batch mixing was poured out after 5 minutes, and envelope bucket is for subsequent use.Continue 66 barrels of batch mixings according to above method.
C. rotary drum is exitted, and 10 barrels of mixed material are packed in rotary drum and vacuumized by feeding cart.Each feeding in raw material all needs to re-start venting subsequently, and material loading, is evacuated to (1～8) × 10
-2pa;
D. the working chamber of electron-beam cold bed furnace, He Lading chamber, vibration charging chamber are evacuated to 4x 10
-2pa, then opens and draws ingot chamber plate valve, will draw ingot heelpiece to rise up in water jacketed copper crucible.
E. open 1#, 2#, 3#, 4#, 5# electron beam gun, select " positioning of beam " step (not replaceable), readability and the angle of each electron beam gun working order and stroboscope are confirmed.
F. by 1,2,3# and 4,5,6# electron beam gun GIP be adjusted to " preheating " step (not replaceable) and the titanium scull in fusing cold bed, refining cold bed or overflow cold bed carried out to slow preheating it is slowly expanded.
G. treat to form molten bath passage on scull, start 123/456# rifle GIP to be adjusted to " testing current step ", the emission maximum electric current that can reach electron beam gun is tested.
H. 123# electron beam gun GIP is adjusted to " continuing melting " step, utilizes large electric current to melt raw material;
I. treat that titanium liquid flow to crucible place, 456# electron beam gun GIP is adjusted to " filling crucible " step, first crucible heelpiece is filled completely, 456# electron beam gun GIP is adjusted to " continuing melting " step, then start automatically ingot pulling.
J. in lasting fusion process, the interior 5# rifle of step has special clear edge graph shape " to continue melting ", constantly crucible limit portion is scanned, in crucible, formed condensation product and be mingled with to prevent that the titanium condensation product of limit portion growth from falling into, thereby have influence on the internal soundness of slab.
If K. continue in fusion process, because causing melting, Equipment interrupts, 123# electron beam gun GIP is adjusted to " preheating " step, 456# electron beam gun GIP is adjusted to " continuous heating step is interrupted in melting ", 5# rifle is to slab top continuous heating.
L. ingot length to be drawn reaches the length needing, and stops charging, and closes 1#, 2#, 3#, 4# electron beam gun, stays 5# electron beam gun.
M. 456# electron beam gun GIP being adjusted to " clear limit " step (not replaceable) uses dedicated scan figure to clear up crucible runner and crucible limit portion.
N. 456# electron beam gun GIP is adjusted to " heat-sealing top " step (not replaceable) slab ingot top seal to top, make its Slow cooling, prevent quick cooling and cause inner shrinkage cavity shrinkage porosity.
O. heat-sealing top is complete, and all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing ingot indoor cooling more than 6 hours, and then blow-on venting, goes out ingot, and going out ingot specification is 200*1290*5725mm.
The close survey result of slab chemical composition melting out is as following table 3.
Table 3
| Specimen coding | Fe | C | O | H | N | Corresponding slab length |
| 0482-1 | 0.05 | 0.02 | 0.034 | 0.001 | 0.005 | 4050 |
| 0482-2 | 0.034 | 0.01 | 0.037 | 0.001 | 0.005 | 4150 |
| 0482-3 | 0.032 | 0.01 | 0.033 | 0.001 | 0.005 | 4250 |
| 0482-4 | 0.034 | 0.02 | 0.038 | 0.001 | 0.005 | 4350 |
| 0482-5 | 0.033 | 0.02 | 0.033 | 0.001 | ＜0.005 | 4450 |
| 0482-6 | 0.041 | 0.02 | 0.033 | 0.001 | 0.005 | 4550 |
| 0482-7 | 0.044 | 0.02 | 0.033 | 0.001 | ＜0.005 | 4650 |
| 0482-8 | 0.045 | 0.01 | 0.034 | 0.001 | ＜0.005 | 4750 |
| 0482-9 | 0.039 | 0.01 | 0.034 | 0.001 | 0.005 | 4850 |
| 0482-10 | 0.035 | 0.02 | 0.033 | 0.001 | ＜0.005 | 4950 |
The Surface Quality of Steel Billet melting out is good, and chemical composition is even, and milling face 5mm rear surface permeation flaw detection defect is little, and ultrasonic inspection result inside is without major defect.Slab is directly used in hot rolling rolling or the saw stock that is cut into small pieces and carries out hot rolling.
embodiment 2: general T A2 melting
Starting material: 29% pulverizes reclaimed materials+0 grade titanium sponge+titanium dioxide.
Equipment: EBCHR 6/200/3600 type electron-beam cold bed furnace.
Slab ingot chemical composition defines as table 4.
Table 4
Actual melting technology:
A. raw material preparation: the thick TA2 block material of general≤4.5mm utilizes hydraulic shear to pulverize, dead small is pulverized specification < 100*100mm, and carries out degreasing pickling.
B. batching: choose 1 barrel 0 grade titanium sponge (250kg) and 1 barrel of TA2 crushed material (100kg/ bucket), and configure titanium dioxide material bag, drop into successively and carry out batch mixing in mixer.Batch mixing was poured out after 5 minutes, and envelope bucket is for subsequent use.Continue 76 barrels of batch mixings according to above method.
C. rotary drum is exitted, and 10 barrels of mixed material are packed in rotary drum and vacuumized by feeding cart.Each feeding in raw material all needs to re-start venting subsequently, and material loading, is evacuated to (1～8) × 10
-2pa;
D. the working chamber of electron-beam cold bed furnace, He Lading chamber, vibration charging chamber are evacuated to 4x 10
-2pa, then opens and draws ingot chamber plate valve, will draw ingot heelpiece to rise up in water jacketed copper crucible.
E. open 1#, 2#, 3#, 4#, 5# electron beam gun, select " positioning of beam " step (not replaceable), readability and the angle of each electron beam gun working order and stroboscope are confirmed.
F. by 1,2,3# and 4,5,6# electron beam gun GIP be adjusted to " preheating " step (not replaceable) and the titanium scull in fusing cold bed, refining cold bed or overflow cold bed carried out to slow preheating it is slowly expanded.
G. treat to form molten bath passage on scull, start 123/456# rifle GIP to be adjusted to " testing current step ", the emission maximum electric current that can reach electron beam gun is tested.
H. 123# electron beam gun GIP is adjusted to " continuing melting " step, utilizes large electric current to melt raw material;
I. treat that titanium liquid flow to crucible place, 456# electron beam gun GIP is adjusted to " filling crucible " step, first crucible heelpiece is filled completely, 456# electron beam gun GIP is adjusted to " continuing melting " step, then start automatically ingot pulling.
J. in lasting fusion process, the interior 5# rifle of step has special clear edge graph shape " to continue melting ", constantly crucible limit portion is scanned, in crucible, formed condensation product and be mingled with to prevent that the titanium condensation product of limit portion growth from falling into, thereby have influence on the internal soundness of slab.
If K. continue in fusion process, because causing melting, Equipment interrupts, 123# electron beam gun GIP is adjusted to " preheating " step, 456# electron beam gun GIP is adjusted to " continuous heating step is interrupted in melting ", 5# rifle is to slab top continuous heating.
L. ingot length to be drawn reaches the length needing, and stops charging, and closes 1#, 2#, 3#, 4# electron beam gun, stays 5# electron beam gun.
M. 456# electron beam gun GIP being adjusted to " clear limit " step (not replaceable) uses dedicated scan figure to clear up crucible runner and crucible limit portion.
N. 456# electron beam gun GIP is adjusted to " heat-sealing top " step (not replaceable) slab ingot top seal to top, make its Slow cooling, prevent quick cooling and cause inner shrinkage cavity shrinkage porosity.
O. heat-sealing top is complete, and all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing ingot indoor cooling more than 6 hours, and then blow-on venting, goes out ingot, and going out ingot specification is 200*1290*5725mm.
The close survey of slab chemical composition melting out is as following table 5.
Table 5
| Specimen coding | Fe | C | N | H | O | Corresponding length |
| EB130782-1 | 0.045 | 0.02 | 0.0068 | 0.001 | 0.125 | 300 |
| EB130782-2 | 0.043 | 0.02 | 0.0079 | 0.001 | 0.125 | 400 |
| EB130782-3 | 0.045 | 0.02 | 0.0069 | 0.001 | 0.108 | 500 |
| EB130782-4 | 0.045 | 0.02 | 0.0062 | 0.001 | 0.102 | 600 |
| EB130782-5 | 0.047 | 0.01 | 0.0053 | 0.001 | 0.095 | 700 |
| EB130782-6 | 0.05 | 0.01 | 0.0063 | 0.001 | 0.100 | 800 |
| EB130782-7 | 0.052 | 0.02 | 0.0050 | 0.001 | 0.094 | 900 |
| EB130782-8 | 0.041 | 0.02 | 0.0050 | 0.001 | 0.100 | 1000 |
| EB130782-9 | 0.042 | 0.01 | 0.0050 | 0.001 | 0.100 | 1100 |
| EB130782-10 | 0.051 | 0.01 | 0.0050 | 0.001 | 0.095 | 1200 |
The Surface Quality of Steel Billet melting out is good, and chemical composition is even, and milling face 5mm rear surface permeation flaw detection defect is little, and ultrasonic inspection result inside is without major defect.Slab is directly used in hot rolling rolling or the saw stock that is cut into small pieces and carries out hot rolling.
Part not in the detailed description of the invention is prior art.
Claims (7)
1. use the method for electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board, described method comprises raw material preparation, chooses batching, mixer batch mixing, vacuumizes and use the raw material after electron-beam cold bed furnace melting vacuumizes, to obtain the slab ingot of waste recovery melting, it is characterized in that: concrete operation step is as follows:
1) raw material preparation:
A, utilize pulverizer to pulverize in pure titanium titanium bits, titanium bits are pulverized specification < 50mm, and carry out magnetic separation dedusting; Be that the pure titanium sheet metal that is less than 4mm utilizes sheet shears to shear pulverizing by thickness, the specification that thin titanium board is sheared is for being less than 100x100mm;
B, connect previous step, the pure titanium waste material after the pulverizing of obtaining in previous step is carried out packing in titanium sponge bucket after pickling, degreasing, cleaning, oven dry, every barrel of indicated weight 100kg, at the outside mark of the titanium sponge bucket trade mark, date manufactured and weight, for subsequent use;
2) choose batching:
C, connect previous step, once select 4 with interior ad eundem and the chemical composition titanium sponge batch close with hardness, and choose the titanium bits after pulverizing or pulverize after thin plate;
D, connect previous step, titanium dioxide material bag of every barrel of preparation of raw material, and wrap the corresponding weight of mark at titanium dioxide material, the titanium sponge during according to batch mixing batch is chosen corresponding material bag and is carried out batch mixing;
3) mixer batch mixing:
E, connect previous step, material loading: utilize hydraulic pressure barrel handling carrier that titanium sponge bucket is put to mixer roller-way, and utilize the automatic turning mechanism of mixer that the raw material in titanium sponge bucket is poured in elevating hopper, elevating hopper rises to the opening for feed of batch mixing rotating cylinder below from ground level, elevating hopper base plate is opened into swash plate automatically, raw material enters in batch mixing rotating cylinder by swash plate, mixer rotating cylinder rotates 3-5 second, raw material is shakeout, then the titanium dioxide material bag that belongs to this barrel of counterweight is evenly sprinkled in raw material, the raw material of remaining titanium sponge barreled is according to above method feeding in continuous material;
F, connect previous step, batch mixing: all after material loadings, the front and back material of rotary drum blender mixer mouthful need be covered with cover plate, to prevent that titanium dioxide powder dirt from overflowing, rotating cylinder is just transferring batch mixing to, overturns as discharging, mixing time is 3-6 minute, and mixing time is expired rotating cylinder after 3-6 minute and automatically stopped;
G, connect previous step, discharging: after rotating cylinder batch mixing stops, titanium sponge bucket is put to discharge port funnel below and connected material, after material is full, presses and stop discharging button, removed with hydraulic pressure barrel handling carrier, then connect next bucket, discharging divides to be carried out for three times, is respectively charged in 3 titanium sponge buckets;
H, connect previous step, sealing: for preventing the air-breathing moisture absorption of titanium sponge, after batch mixing finishes, by titanium sponge bucket good seal, and mark batch mixing lot number on bung;
4) vacuumize:
Connect previous step, by rotary drum venting, and material mixed 6-10 bucket is packed in rotary drum and vacuumized by feeding cart, each feeding in raw material all needs to re-start venting subsequently, and material loading, is evacuated to (1～8) × 10
-2pa; By the working chamber of electron-beam cold bed furnace, feed compartment with draw ingot chamber to be evacuated to (1～8) × 10
-2pa, then opens and draws ingot chamber plate valve, will draw ingot heelpiece to rise up in water jacketed copper crucible;
5) use the raw material after electron-beam cold bed furnace melting vacuumizes:
I, connect previous step, confirm the working order of electron beam gun: open 1#, 2#, 3#, 4#, 5#, 6# electron beam gun, select " positioning of beam " step, readability and the angle of each electron beam gun working order and stroboscope are confirmed;
J, connect previous step, connect previous step, preheating: the GIP of 1#, 2#, 3#, 4#, 5#, 6# electron beam gun is adjusted to " preheating " step and the titanium scull in fusing cold bed, refining cold bed or overflow cold bed is carried out to slow preheating it is slowly expanded;
K, connect previous step, testing current: treat to form molten bath passage on titanium scull, start the GIP of 1#, 2#, 3#, 4#, 5#, 6# rifle to be adjusted to " testing current step ", the emission maximum electric current that can reach electron beam gun is tested;
L, connect previous step, continue melting: by 1,2, the GIP of 3# electron beam gun is adjusted to " continuing melting " step, utilizes large electric current that raw material is molten into titanium liquid;
M, connect previous step, fill crucible: treat that titanium liquid flow to crucible place, by 4,5, the GIP of 6# electron beam gun is adjusted to " filling crucible " step, by crucible heelpiece fill full after, by 4,5,6# electron beam gun GIP is adjusted to after " continuing melting " step, starts automatically ingot pulling to the length needing;
N, connect previous step, close 1#, 2#, 3#, 4# electron beam gun: to the length needing, close 1#, 2#, 3#, 4# electron beam gun until automatically ingot pulling, stay 5#, 6# electron beam gun;
O, connect previous step, clear limit: 4#, 5#, 6# electron beam gun GIP are adjusted to " clear limit " step and use dedicated scan figure to clear up crucible runner and crucible limit portion;
P, connect previous step, heat-sealing top: 4#, 5#, 6# electron beam gun GIP are adjusted to " heat-sealing top " step slab ingot top is sealed to top;
Q, connect previous step, after heat-sealing top, all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing the indoor cooling 6-10 of ingot hour, and then blow-on venting, goes out ingot.
2. the method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board according to claim 1, is characterized in that: the inwall of the pulverizer described in step 1 is stainless steel plate.
3. the method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board according to claim 1, it is characterized in that: in the step of batch mixing described in step 2, feed intake at most three barrels, method for mixing is that two barrels of titanium sponges (500Kg/1 bucket) add one barrel of raw material (100Kg/1 bucket), one barrel of titanium sponge (250Kg/1 bucket) after pulverizing and add one barrel of raw material (100Kg/1 bucket) after pulverizing or the interpolation of different ratios at every turn.
4. the method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board according to claim 1, is characterized in that: in described batch mixing step, every three barrels while carrying out batch mixing, wherein any two barrels of titanium sponges are selected the titanium sponge of different batches.
5. the method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board according to claim 1, it is characterized in that: the electron-beam cold bed furnace described in step 5 comprises six electron beam gun, the work area of described electron beam gun is distributed as: 1#, 2# electron beam gun work area are melting cold bed, 3#, 4# electron beam gun are refining cold bed, 5#, 6# electron beam gun are overflow cold bed and 1#2# crystallizer, described 1#, 2#, 3# electron beam gun be by the GIP time variable control of 1# computer, and described 4#, 5#, 6# electron beam gun are by the GIP time variable control of 2# computer.
6. the method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board according to claim 1, is characterized in that: in the lasting melting step in step 5, the temperature of crucible titanium liquid is 190-200 ℃.
7. the method with electron beam cold hearth melting stove melting titanium bits and the pure titanium waste material of thin titanium board according to claim 1, is characterized in that: the model of described electron-beam cold bed furnace is EBCHR 6/200/3600.
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