CN103042389B - Precise forging-continuous rolling production technology of large and heavy single molybdenum rod - Google Patents
Precise forging-continuous rolling production technology of large and heavy single molybdenum rod Download PDFInfo
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Abstract
The invention provides a precise forging-continuous rolling production technology of a large and heavy single molybdenum rod. The production technology comprises the following steps of: 1, carrying out billet forging on the molybdenum rod by a precision forging machine to obtain a precision forging bar; 2, heating the precision forging bar; 3, rolling for the first time by a Y-shaped three-roller continuous mill to obtain a rolled molybdenum rod; 4, heating the rolled molybdenum rod; and 5, rolling for the second time by the Y-shaped three-roller continuous mill and obtaining the large and heavy single molybdenum rod of which the piece weight is 45-50kg. Deep processing of a molybdenum bar is successfully achieved by setting and optimizing each parameter in precision forging, thermal treatment and continuous rolling processes; the large and heavy single molybdenum rod, which is suitable for subsequent wire drawing, and of which the piece weight is 45-50kg, is finally produced; and the production efficiency is obviously improved. The piece weight of the molybdenum rod produced by the production technology is much greater than that of the molybdenum rod produced by a traditional technology; and the precise forging-continuous rolling production technology has no welding spot on the whole, and is even in internal organization, high in product quality and suitable for large-scale industrial production.
Description
Technical field
The invention belongs to Molybdenum metal materials industry processing technique field, be specifically related to a kind of finish forge-rolling production technique of large piece weight molybdenum bar.
Background technology
Molybdenum filament is generally processed by molybdenum rod, and domestic traditional molybdenum rod production method mainly contains " sintering molybdenum bar revolves hammer cogging-drawing " method and " rolling-cogging-drawing of sintering molybdenum bar " method.Compared with external similar molybdenum rod product, the substance of molybdenum rod adopting " sintering molybdenum bar revolves hammer cogging-drawing " method to produce and the weight of single molybdenum rod are only about 1kg, and the substance of the molybdenum rod adopting " rolling-cogging-drawing of sintering molybdenum bar " method to produce is less than 14kg; And the molybdenum rod of produced in conventional processes is little due to substance, it is short to process the molybdenum filament length that obtains, causes the production of large piece weight molybdenum silk to carry out repeatedly butt welding, because inconsistent and quality of welding spot problem organized by solder joint tissue and normal molybdenum rod, easily causes the quality problems of molybdenum filament.Therefore, needing that exploitation is a kind of badly can the production technology of the high-quality large piece weight molybdenum bar of steady production.
Up to now, not yet finding to adopt finish forge-continuous rolling process to produce substance is that the correlative study of the large piece weight molybdenum bar of 45kg ~ 50kg is seen in report.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of finish forge-rolling production technique of large piece weight molybdenum bar.This production technology is by the setting of each parameter in each technical process of finish forge, heating and tandem rolling and optimization, successfully achieve the deep processing to molybdenum rod blank, finally preparing substance is 45kg ~ 50kg, and is applicable to the large piece weight molybdenum bar of follow-up wire drawing, and production efficiency significantly improves.Adopt the substance of the molybdenum rod of this explained hereafter up to 45kg ~ 50kg, overall no-welding-spot, interior tissue is even, and product quality is high, is suitable for large-scale industrial production.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of finish forge-rolling production technique of large piece weight molybdenum bar, and it is characterized in that, this technique comprises the following steps:
Step one, the molybdenum rod blank adopting precise forging machine to be 85mm ~ 90mm by diameter of section carry out cogging forging, obtain the smart forging rod billet that diameter of section is 48mm ~ 49mm; Described cogging forging adopts the forging mode of axially pulling, and the initial forging temperature of described cogging forging is 1450 DEG C ~ 1500 DEG C, and the final forging temperature of described cogging forging is 1150 DEG C ~ 1200 DEG C;
It is be incubated 16min ~ 17min after 1450 DEG C ~ 1500 DEG C that forging rod billet smart described in step one is heated to temperature by step 2, employing intermediate-frequency heating furnace;
Smart forging rod billet after heating in step 2 rolls under temperature is the condition of 1450 DEG C ~ 1500 DEG C in the beginning and carries out the first rolling by step 3, employing Y type three-roller continuous rolling mill, obtains rolling molybdenum rod; The finishing temperature of described first rolling is 1100 DEG C ~ 1150 DEG C, and the cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 14mm ~ 16mm;
It is be incubated 1min ~ 2min after 1250 DEG C ~ 1300 DEG C that the molybdenum rod of rolling described in step 3 is heated to temperature by step 4, employing intermediate-frequency heating furnace;
Rolling molybdenum rod after heating in step 4 rolls under temperature is the condition of 1250 DEG C ~ 1300 DEG C in the beginning and carries out the second rolling by step 5, employing Y type three-roller continuous rolling mill, obtains the large piece weight molybdenum bar that substance is 45kg ~ 50kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7mm ~ 8mm.
Finish forge-rolling production the technique of above-mentioned a kind of large piece weight molybdenum bar, is characterized in that, molybdenum rod blank described in step one is sintered state molybdenum rod blank.
Finish forge-rolling production the technique of above-mentioned a kind of large piece weight molybdenum bar, is characterized in that, the forging of cogging described in step one is divided into 3 passages and completes.
Finish forge-rolling production the technique of above-mentioned a kind of large piece weight molybdenum bar, is characterized in that, to be heated to temperature in step 2 be time of 1450 DEG C ~ 1500 DEG C is 3min ~ 4min.
Finish forge-rolling production the technique of above-mentioned a kind of large piece weight molybdenum bar, is characterized in that, the type of Y described in step 3 three-roller continuous rolling mill is Y370 type three-roller continuous rolling mill.
Finish forge-rolling production the technique of above-mentioned a kind of large piece weight molybdenum bar, is characterized in that, the first rolling described in step 3 is divided into 11 passages and completes.
Finish forge-rolling production the technique of above-mentioned a kind of large piece weight molybdenum bar, is characterized in that, the type of Y described in step 5 three-roller continuous rolling mill is Y250 type three-roller continuous rolling mill.
Finish forge-rolling production the technique of above-mentioned a kind of large piece weight molybdenum bar, is characterized in that, the second rolling described in step 5 is divided into 8 passages and completes, and the finishing temperature of described second rolling is 1100 DEG C ~ 1150 DEG C.
The present invention compared with prior art has the following advantages:
(1) finish forge-rolling production technique of large piece weight molybdenum bar of the present invention is Article 1 automatic production line domestic at present; The present invention is through a large amount of practical studies, and pass through the setting parameter in each technical process of finish forge, heat treatment and tandem rolling and optimization, successfully achieve the deep processing to molybdenum rod blank, finally prepare substance and be 45kg ~ 50kg and the large piece weight molybdenum bar being applicable to follow-up wire drawing, production efficiency significantly improves.
(2) first the present invention carries out cogging finish forge to molybdenum rod blank, is conducive to the Microstructure and properties difference reducing excellent base edge and core; And the final forging temperature controlling cogging finish forge is 1150 DEG C ~ 1200 DEG C, be conducive to the generation reducing the defects such as excellent base face crack, ensure the service life of precise forging machine tup simultaneously, reduce production cost and labour intensity.
(3) the present invention heats to eliminate stress after carrying out cogging finish forge to molybdenum rod blank, reduces the stress concentration phenomenon of forging process; Be heated to temperature be 1450 DEG C ~ 1500 DEG C and be incubated, smart forging rod billet perfect recrystallization is annealed, provide effectively ensure for having enough plasticity in the follow-up operation of rolling.
(4) the present invention adopts Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule) and Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule) to be rolled, flat triangle pass schedule not only has larger passage lengthening coefficient, the sectional area of rolled piece can be made to reduce rapidly, enhance productivity, and rolled piece interior tissue can be made even, improve product quality; Meanwhile, adopt flat triangle pass schedule grinding roller convenient, pass machining precision is high, can greatly reduce roll wear.
(5) finish forge-rolling production technique of large piece weight molybdenum bar of the present invention is full-automatic process, significantly be better than traditional swage production technology and traditional rolling process, substantially increase the production efficiency of molybdenum rod, effectively reduce the contamination phenomenon in production process simultaneously.
(6) substance of molybdenum rod adopting the present invention to produce can reach 45kg ~ 50kg, and be far longer than tradition and swage the substance 1kg of technique and the substance 14kg of traditional rolling mill practice, overall no-welding-spot, effectively ensure that product quality.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Fig. 2 is the horizontal organization figure of the large piece weight molybdenum bar that the embodiment of the present invention 1 is produced.
Fig. 3 is the longitudinal tissue figure of the large piece weight molybdenum bar that the embodiment of the present invention 1 is produced.
Detailed description of the invention
Embodiment 1
Composition graphs 1, the finish forge-rolling production technique of the present embodiment large piece weight molybdenum bar comprises the following steps:
Step one, the sintered state molybdenum rod blank adopting precise forging machine to be 85mm by diameter of section carry out cogging forging, described cogging forging adopts the forging mode of axially pulling, be divided into three passages to complete, the deformation data of each passage cogging forging is in table 1, the initial forging temperature of cogging forging is 1450 DEG C, the final forging temperature of cogging forging is 1150 DEG C, obtains the smart forging rod billet that diameter of section is 48mm; The precise forging machine that described precise forging machine can adopt Austrian GFM company to produce;
The deformation data of table 1 the present embodiment cogging forging
| Forging passage | First passage | Second passage | 3rd passage |
| Deflection (%) | 26.2 | 39.0 | 29.1 |
Forging rod billet smart described in step one is heated to be incubated 16min after temperature is 1450 DEG C by step 2, employing intermediate-frequency heating furnace; To be heated to temperature be time of 1450 DEG C is 3min;
Smart forging rod billet after heating in step 2 is carried out the first rolling by step 3, employing Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule), described first rolling is divided into 11 passages and completes, the deformation data of each passage first rolling is in table 2, it is 1450 DEG C that the beginning of the first rolling rolls temperature, the finishing temperature of the first rolling is 1100 DEG C, obtains rolling molybdenum rod; The cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 14mm; The Y370 type three-roller continuous rolling mill of what described Y370 type three-roller continuous rolling mill can adopt Luoyang designing institute to produce carry flat triangle pass schedule;
The deformation data of table 2 the present embodiment first rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Deflection (%) | 5.3 | 22.5 | 22.5 | 22.5 | 22.5 | 20.6 | 21.3 | 20.6 | 18.7 | 18.7 | 15.9 |
The molybdenum rod of rolling described in step 3 is heated to be incubated 1min after temperature is 1250 DEG C by step 4, employing intermediate-frequency heating furnace;
Rolling molybdenum rod after heating in step 4 is carried out the second rolling by step 5, employing Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule), described second rolling is divided into 8 passages and completes, the deformation data of each passage second rolling is in table 3, it is 1250 DEG C that the beginning of described second rolling rolls temperature, the finishing temperature of the second rolling is 1100 DEG C, obtains the large piece weight molybdenum bar that substance is 45kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7.0mm; The Y250 type three-roller continuous rolling mill of what described Y250 type three-roller continuous rolling mill can adopt German KOCKS company to produce carry flat triangle pass schedule.
The deformation data of table 3 the present embodiment second rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Deflection (%) | 7.0 | 19.4 | 19.4 | 18.7 | 18.7 | 18.7 | 18.7 | 5.7 |
The horizontal organization figure of the large piece weight molybdenum bar adopting the present embodiment to produce as shown in Figure 2, longitudinal tissue figure as shown in Figure 3, the dense structure of the large piece weight molybdenum bar produced by the known employing the present embodiment of Fig. 2 and Fig. 3 and evenly.
The mechanical properties data of the large piece weight molybdenum bar adopting the present embodiment to produce is in table 10.
Embodiment 2
Composition graphs 1, the finish forge-rolling production technique of the present embodiment large piece weight molybdenum bar comprises the following steps:
Step one, the sintered state molybdenum rod blank adopting precise forging machine to be 88mm by diameter of section carry out cogging forging, described cogging forging adopts the forging mode of axially pulling, be divided into three passages to complete, the deformation data of each passage cogging forging is in table 4, the initial forging temperature of cogging forging is 1480 DEG C, the final forging temperature of cogging forging is 1180 DEG C, obtains the smart forging rod billet that diameter of section is 48.5mm; The precise forging machine that described precise forging machine can adopt Austrian GFM company to produce;
The deformation data of table 4 the present embodiment cogging forging
| Forging passage | First passage | Second passage | 3rd passage |
| Deflection (%) | 31.2 | 39.03 | 27.6 |
Forging rod billet smart described in step one is heated to be incubated 16.5min after temperature is 1480 DEG C by step 2, employing intermediate-frequency heating furnace; The time of heating up in heating process is 3.5min;
Smart forging rod billet after heating in step 2 is carried out the first rolling by step 3, employing Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule), described first rolling is divided into 11 passages and completes, the deformation data of each passage first rolling is in table 5, it is 1480 DEG C that the beginning of the first rolling rolls temperature, the finishing temperature of the first rolling is 1120 DEG C, obtains rolling molybdenum rod; The cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 15mm; The Y370 type three-roller continuous rolling mill of what described Y370 type three-roller continuous rolling mill can adopt Luoyang designing institute to produce carry flat triangle pass schedule;
The deformation data of table 5 the present embodiment first rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Deflection (%) | 7.2 | 21.3 | 21.3 | 20.6 | 20.6 | 20.0 | 20.0 | 19.4 | 18.0 | 18.0 | 16.0 |
The molybdenum rod of rolling described in step 3 is heated to be incubated 1.5min after temperature is 1280 DEG C by step 4, employing intermediate-frequency heating furnace;
Rolling molybdenum rod after heating in step 4 is carried out the second rolling by step 5, employing Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule), described second rolling is divided into 8 passages and completes, the deformation data of each passage second rolling is in table 6, it is 1280 DEG C that the beginning of the second rolling rolls temperature, the finishing temperature of the second rolling is 1120 DEG C, obtains the large piece weight molybdenum bar that substance is 48kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7.6mm; The Y250 type three-roller continuous rolling mill of what described Y250 type three-roller continuous rolling mill can adopt German KOCKS company to produce carry flat triangle pass schedule.
The deformation data of table 6 the present embodiment second rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Deflection (%) | 7.4 | 19.4 | 18.7 | 18.7 | 18.0 | 18.0 | 18.0 | 5.7 |
The dense structure of the large piece weight molybdenum bar adopting the present embodiment to produce and evenly.The mechanical properties data of the large piece weight molybdenum bar adopting the present embodiment to produce is in table 10.
Embodiment 3
Composition graphs 1, the finish forge-rolling production technique of the present embodiment large piece weight molybdenum bar comprises the following steps:
Step one, the sintered state molybdenum rod blank adopting precise forging machine to be 90mm by diameter of section carry out cogging forging, described cogging forging adopts the forging mode of axially pulling, be divided into three passages to complete, the deformation data of each passage cogging forging is in table 7, the initial forging temperature of cogging forging is 1500 DEG C, the final forging temperature of cogging forging is 1200 DEG C, obtains the smart forging rod billet that diameter of section is 49mm; The precise forging machine that described precise forging machine can adopt Austrian GFM company to produce;
The deformation data of table 7 the present embodiment cogging forging
| Forging passage | First passage | Second passage | 3rd passage |
| Deflection (%) | 34.2 | 39.03 | 26.1 |
Forging rod billet smart described in step one is heated to be incubated 17min after temperature is 1500 DEG C by step 2, employing intermediate-frequency heating furnace; The time of heating up in heating process is 4min;
Smart forging rod billet after heating in step 2 is carried out the first rolling by step 3, employing Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule), described first rolling is divided into 11 passages and completes, the deformation data of each passage first rolling is in table 8, it is 1500 DEG C that the beginning of the first rolling rolls temperature, the finishing temperature of the first rolling is 1150 DEG C, obtains rolling molybdenum rod; The cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 16mm; The Y370 type three-roller continuous rolling mill of what described Y370 type three-roller continuous rolling mill can adopt Luoyang designing institute to produce carry flat triangle pass schedule;
The deformation data of table 8 the present embodiment first rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Deflection (%) | 9.1 | 20.6 | 20.6 | 20 | 19.4 | 18.0 | 18.0 | 17.4 | 17.4 | 17.4 | 16.0 |
The molybdenum rod of rolling described in step 3 is heated to be incubated 2min after temperature is 1300 DEG C by step 4, employing intermediate-frequency heating furnace;
Rolling molybdenum rod after heating in step 4 is carried out the second rolling by step 5, employing Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule), described second rolling is divided into 8 passages and completes, the deformation data of each passage second rolling is in table 9, it is 1300 DEG C that the beginning of the second rolling rolls temperature, the finishing temperature of the second rolling is 1150 DEG C, obtains the large piece weight molybdenum bar that substance is 50kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 8.0mm; The Y250 type three-roller continuous rolling mill of what described Y250 type three-roller continuous rolling mill can adopt German KOCKS company to produce carry flat triangle pass schedule.
The deformation data of table 9 the present embodiment second rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Deflection (%) | 7.4 | 19.4 | 19.4 | 19.4 | 18.7 | 18.0 | 18.0 | 5.7 |
The dense structure of the large piece weight molybdenum bar adopting the present embodiment to produce and evenly.The mechanical properties data of the large piece weight molybdenum bar adopting the present embodiment to produce is in table 10.
The mechanical properties data result of the large piece weight molybdenum bar that table 10 adopts the present invention to produce
As shown in Table 10, the hardness of the large piece weight molybdenum bar adopting the embodiment of the present invention 1 to 3 to produce is 240HV ~ 280HV, compression strength is 800MPa ~ 900MPa, and percentage elongation is 10% ~ 15%, illustrates that the large piece weight molybdenum bar adopting the present invention to produce has excellent mechanical performance.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (7)
1. finish forge-rolling production technique of large piece weight molybdenum bar, it is characterized in that, this technique comprises the following steps:
Step one, the molybdenum rod blank adopting precise forging machine to be 85mm ~ 90mm by diameter of section carry out cogging forging, obtain the smart forging rod billet that diameter of section is 48mm ~ 49mm; Described cogging forging adopts the forging mode of axially pulling, and the initial forging temperature of described cogging forging is 1450 DEG C ~ 1500 DEG C, and the final forging temperature of described cogging forging is 1150 DEG C ~ 1200 DEG C; Described molybdenum rod blank is sintered state molybdenum rod blank;
It is be incubated 16min ~ 17min after 1450 DEG C ~ 1500 DEG C that forging rod billet smart described in step one is heated to temperature by step 2, employing intermediate-frequency heating furnace;
Smart forging rod billet after heating in step 2 rolls under temperature is the condition of 1450 DEG C ~ 1500 DEG C in the beginning and carries out the first rolling by step 3, employing Y type three-roller continuous rolling mill, obtains rolling molybdenum rod; The finishing temperature of described first rolling is 1100 DEG C ~ 1150 DEG C, and the cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 14mm ~ 16mm;
It is be incubated 1min ~ 2min after 1250 DEG C ~ 1300 DEG C that the molybdenum rod of rolling described in step 3 is heated to temperature by step 4, employing intermediate-frequency heating furnace;
Rolling molybdenum rod after heating in step 4 rolls under temperature is the condition of 1250 DEG C ~ 1300 DEG C in the beginning and carries out the second rolling by step 5, employing Y type three-roller continuous rolling mill, obtains the large piece weight molybdenum bar that substance is 45kg ~ 50kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7mm ~ 8mm.
2. finish forge-rolling production the technique of a kind of large piece weight molybdenum bar according to claim 1, is characterized in that, the forging of cogging described in step one is divided into 3 passages and completes.
3. finish forge-rolling production the technique of a kind of large piece weight molybdenum bar according to claim 1, is characterized in that, to be heated to temperature in step 2 be time of 1450 DEG C ~ 1500 DEG C is 3min ~ 4min.
4. finish forge-rolling production the technique of a kind of large piece weight molybdenum bar according to claim 1, is characterized in that, the type of Y described in step 3 three-roller continuous rolling mill is Y370 type three-roller continuous rolling mill.
5. finish forge-rolling production the technique of a kind of large piece weight molybdenum bar according to claim 1, is characterized in that, the first rolling described in step 3 is divided into 11 passages and completes.
6. finish forge-rolling production the technique of a kind of large piece weight molybdenum bar according to claim 1, is characterized in that, the type of Y described in step 5 three-roller continuous rolling mill is Y250 type three-roller continuous rolling mill.
7. finish forge-rolling production the technique of a kind of large piece weight molybdenum bar according to claim 1, is characterized in that, the second rolling described in step 5 is divided into 8 passages and completes, and the finishing temperature of described second rolling is 1100 DEG C ~ 1150 DEG C.
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| CN105499460B (en) * | 2015-12-30 | 2017-11-07 | 天津重型装备工程研究有限公司 | The asymmetric drafts pulling technique of heavy forging |
| CN107931355A (en) * | 2017-11-17 | 2018-04-20 | 金堆城钼业股份有限公司 | A kind of production method of spray molybdenum wires |
| CN108356192B (en) * | 2018-04-09 | 2019-09-20 | 清华大学 | A kind of Integral die-forged method of railway frog |
| CN110000387B (en) * | 2019-05-20 | 2021-06-01 | 安泰天龙钨钼科技有限公司 | Large-size fine-grain tungsten rod and two-roller rolling preparation method thereof |
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