CN103203600B - Adopt finish forge legal system for the method for molybdenum electrode bar - Google Patents
Adopt finish forge legal system for the method for molybdenum electrode bar Download PDFInfo
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- CN103203600B CN103203600B CN201310127672.4A CN201310127672A CN103203600B CN 103203600 B CN103203600 B CN 103203600B CN 201310127672 A CN201310127672 A CN 201310127672A CN 103203600 B CN103203600 B CN 103203600B
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Abstract
Employing finish forge legal system disclosed by the invention, for the method for molybdenum electrode bar, comprises the choosing of molybdenum powder, pressed bar, sintering molybdenum rod blank, comparatively straight and forging five steps.The invention solves specification and the unmatched problem of forging mode of molybdenum rod blank in prior art, and the molybdenum electrode bar that method of the present invention is obtained, there is barred body structured size, uniform quality, impulse-free robustness, without the advantage of surface checking.
Description
Technical field
The invention belongs to technical field of material, be specifically related to a kind of finish forge legal system that adopts for the method for molybdenum electrode bar.
Background technology
Molybdenum electrode bar be manufactured with two kinds of methods, the first sinters molybdenum rod blank for raw material, adopts pneumatic hammer die forging, but pneumatic hammer die forging technique falls behind, inefficiency, and helpless for the molybdenum electrode bar of comparatively large gauge (length is greater than 2m); The second sinters molybdenum rod blank for raw material, and adopt precise forging machine forging, its powerful working ability and high efficiency are applicable to mass production large gauge molybdenum electrode bar.
The granularity of molybdenum powder and Song Bi are the molybdenum rod blank of the important parameter determining molybdenum powder specification, the Mo powder production of different grain size and Song Bi, and its physical property is also different, and namely different grain size is different with the molybdenum rod blank specification of the Mo powder production of Song Bi.If adopt same forging mode to go to produce molybdenum electrode bar to the molybdenum rod blank of different size, the quality of final molybdenum electrode bar just cannot be ensured.If the molybdenum rod blank being applicable to pneumatic hammer die forging uses finish forge method, have that finish-forging material carrying out flaw detection is defective, forging exists that burr in shrinkage cavity, follow-up wire drawing increases, the problem of surface checking; And if the molybdenum rod blank being applicable to finish forge uses pneumatic hammer die forging rule to there will be the problem of yield rate reduction.
Summary of the invention
The object of the present invention is to provide a kind of finish forge legal system that adopts for the method for molybdenum electrode bar, solve specification and the unmatched problem of forging mode of molybdenum rod blank in prior art.
The technical solution adopted in the present invention is: adopt finish forge legal system for the method for molybdenum electrode bar, comprise the steps:
The first step, choosing of molybdenum powder
Choosing granularity is 4.5 ~ 5.0 μm, and pine is than being 1.25 ~ 1.5g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder first step chosen loads in cylindrical mold, again the mould installing molybdenum powder is put into cold isostatic press to suppress, and the pressure of cold isostatic press being set to 180 ~ 200Mpa, pressurize 8 ~ 15 minutes again after compacting, obtained diameter is the molybdenum rod blank of 68 ~ 100mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step is loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 0.7 ~ 1.0m
3/ h;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 ~ 1350 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
Forge carrying out carrying out multi-pass after a fire heats through more straight molybdenum rod blank, obtained molybdenum electrode bar.
Feature of the present invention is also,
Segmented sintering in 3rd step is specially: first heat and within 3 ~ 4 hours, make furnace temperature rise to 1000 DEG C from 20 DEG C, be then incubated 1.5 ~ 2.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 2.5 ~ 4 hours; Heat 2 little of 1600 DEG C, be incubated 3.5 ~ 4 hours; Heat 2 little of 1800 DEG C, be incubated 2.5 ~ 3.5 hours; Heat 2 little of 1850 DEG C, be incubated 5 ~ 7 hours, heating 2 is little of 1900 DEG C, is incubated 5 ~ 6 hours.
The heating carrying out multi-pass after a fire heating in 5th step forges, be specially: at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces by 12 ~ 21mm, and the diameter that the second passage forges rear molybdenum rod blank reduces by 3 ~ 16mm, and the diameter that the 3rd passage forges rear molybdenum rod blank reduces by 1 ~ 4mm.
The invention has the beneficial effects as follows: the molybdenum electrode bar that the method preparing molybdenum electrode bar of the present invention obtains, there is barred body structured size, uniform quality, impulse-free robustness, without the advantage of surface checking.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in detail.
Embodiment 1
The first step, choosing of molybdenum powder
Choosing granularity is 4.5 μm, and pine is than being 1.25g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder the first step chosen loads in cylindrical mold, then the mould installing molybdenum powder is put into cold isostatic press suppresses, and the pressure of cold isostatic press is set to 180Mpa, pressurize 8 minutes again after compacting, and obtained diameter is the molybdenum rod blank of 68mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, first heating makes furnace temperature rise to 1000 DEG C from 20 DEG C for 3 hours, is then incubated 1.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 2.5 hours; Heat 2 little of 1600 DEG C, be incubated 3.5 hours; Heat 2 little of 1800 DEG C, be incubated 2.5 hours; Heat 2 little of 1850 DEG C, be incubated 5 hours, heating 2 is little of 1900 DEG C, is incubated 5 hours.Again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 0.7m
3/ h;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
By through more straight molybdenum rod blank at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces 11mm, the diameter that second passage forges rear molybdenum rod blank reduces 3mm, and final obtained diameter is the molybdenum electrode bar of 54mm.
The molybdenum electrode bar getting the present embodiment obtained detects, and barred body structured size, uniform quality, impulse-free robustness, without surface checking, density is 9.8g/cm
3, number of die is 2000/cm
2.
Embodiment 2
The first step, choosing of molybdenum powder
Choosing granularity is 5.0 μm, and pine is than being 1.5g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder the first step chosen loads in cylindrical mold, then the mould installing molybdenum powder is put into cold isostatic press suppresses, and the pressure of cold isostatic press is set to 200Mpa, pressurize 15 minutes again after compacting, and obtained diameter is the molybdenum rod blank of 90mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, first heating makes furnace temperature rise to 1000 DEG C from 20 DEG C for 4 hours, is then incubated 2.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 3.5 hours; Heat 2 little of 1600 DEG C, be incubated 3.5 hours; Heat 2 little of 1800 DEG C, be incubated 3.5 hours; Heat 2 little of 1850 DEG C, be incubated 5 hours, heating 2 is little of 1900 DEG C, is incubated 6 hours.Again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 1.0m
3/ h;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
By through more straight molybdenum rod blank at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces 17mm, the diameter that second passage forges rear molybdenum rod blank reduces 15mm, and the diameter that the 3rd passage forges rear molybdenum rod blank reduces 4mm.Final obtained diameter is the molybdenum electrode bar of 54mm.
The molybdenum electrode bar getting the present embodiment obtained detects, and barred body structured size, uniform quality, impulse-free robustness, without surface checking, density is 9.9g/cm
3, number of die is 2150/cm
2.
Embodiment 3
The first step, choosing of molybdenum powder
Choosing granularity is 4.8 μm, and pine is than being 1.4g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder the first step chosen loads in cylindrical mold, then the mould installing molybdenum powder is put into cold isostatic press suppresses, and the pressure of cold isostatic press is set to 190Mpa, pressurize 10 minutes again after compacting, and obtained diameter is the molybdenum rod blank of 90mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, first heating makes furnace temperature rise to 1000 DEG C from 20 DEG C for 4 hours, is then incubated 2.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 3.5 hours; Heat 2 little of 1600 DEG C, be incubated 3.5 hours; Heat 2 little of 1800 DEG C, be incubated 3.5 hours; Heat 2 little of 1850 DEG C, be incubated 6 hours, heating 2 is little of 1900 DEG C, is incubated 5 hours.Again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 0.8m
3/ h;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
By through more straight molybdenum rod blank at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces 12mm, the diameter that second passage forges rear molybdenum rod blank reduces 13mm, and the diameter that the 3rd passage forges rear molybdenum rod blank reduces 1mm.Final obtained diameter is the molybdenum electrode bar of 64mm.
The molybdenum electrode bar getting the present embodiment obtained detects, and barred body structured size, uniform quality, impulse-free robustness, without surface checking, density is 9.8g/cm
3, number of die is 2050/cm
2.
Embodiment 4
The first step, choosing of molybdenum powder
Choosing granularity is 4.5 μm, and pine is than being 1.5g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder the first step chosen loads in cylindrical mold, then the mould installing molybdenum powder is put into cold isostatic press suppresses, and the pressure of cold isostatic press is set to 185Mpa, pressurize 13 minutes again after compacting, and obtained diameter is the molybdenum rod blank of 90mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, first heating makes furnace temperature rise to 1000 DEG C from 20 DEG C for 4 hours, is then incubated 2.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 4 hours; Heat 2 little of 1600 DEG C, be incubated 4 hours; Heat 2 little of 1800 DEG C, be incubated 3.5 hours; Heat 2 little of 1850 DEG C, be incubated 7 hours, heating 2 is little of 1900 DEG C, is incubated 5 hours.Again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 0.8m
3/ h;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
By through more straight molybdenum rod blank at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces 15mm, the diameter that second passage forges rear molybdenum rod blank reduces 16mm, and the diameter that the 3rd passage forges rear molybdenum rod blank reduces 1mm.Final obtained diameter is the molybdenum electrode bar of 58mm.
The molybdenum electrode bar getting the present embodiment obtained detects, and barred body structured size, uniform quality, impulse-free robustness, without surface checking, density is 9.7g/cm
3, number of die is 2200/cm
2.
Embodiment 5
The first step, choosing of molybdenum powder
Choosing granularity is 5.0 μm, and pine is than being 1.25g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder the first step chosen loads in cylindrical mold, then the mould installing molybdenum powder is put into cold isostatic press suppresses, and the pressure of cold isostatic press is set to 195Mpa, pressurize 11 minutes again after compacting, and obtained diameter is the molybdenum rod blank of 100mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, first heating makes furnace temperature rise to 1000 DEG C from 20 DEG C for 4 hours, is then incubated 2.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 3.6 hours; Heat 2 little of 1600 DEG C, be incubated 3.8 hours; Heat 2 little of 1800 DEG C, be incubated 3.7 hours; Heat 2 little of 1850 DEG C, be incubated 6.5 hours, heating 2 is little of 1900 DEG C, is incubated 5 hours.Again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 0.9m
3/ h;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
By through more straight molybdenum rod blank at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces 15mm, the diameter that second passage forges rear molybdenum rod blank reduces 16mm, and the diameter that the 3rd passage forges rear molybdenum rod blank reduces 4mm.Final obtained diameter is the molybdenum electrode bar of 65mm.
The molybdenum electrode bar getting the present embodiment obtained detects, and barred body structured size, uniform quality, impulse-free robustness, without surface checking, density is 9.7g/cm
3, number of die is 2100/cm
2.
Embodiment 6
The first step, choosing of molybdenum powder
Choosing granularity is 5.0 μm, and pine is than being 1.25g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder the first step chosen loads in cylindrical mold, then the mould installing molybdenum powder is put into cold isostatic press suppresses, and the pressure of cold isostatic press is set to 180Mpa, pressurize 9 minutes again after compacting, and obtained diameter is the molybdenum rod blank of 100mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, first heating makes furnace temperature rise to 1000 DEG C from 20 DEG C for 4 hours, is then incubated 2.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 3.6 hours; Heat 2 little of 1600 DEG C, be incubated 3.8 hours; Heat 2 little of 1800 DEG C, be incubated 3.7 hours; Heat 2 little of 1850 DEG C, be incubated 6.5 hours, heating 2 is little of 1900 DEG C, is incubated 5 hours.Again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 0.8m
3/ h;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
By through more straight molybdenum rod blank at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces 21mm, the diameter that second passage forges rear molybdenum rod blank reduces 13mm, and the diameter that the 3rd passage forges rear molybdenum rod blank reduces 2mm.Final obtained diameter is the molybdenum electrode bar of 64mm.
The molybdenum electrode bar getting the present embodiment obtained detects, and barred body structured size, uniform quality, impulse-free robustness, without surface checking, density is 9.9g/cm
3, number of die is 2160/cm
2.
Claims (1)
1. adopt finish forge legal system for the method for molybdenum electrode bar, it is characterized in that, comprise the steps:
The first step, choosing of molybdenum powder
Choosing granularity is 4.5 ~ 5.0 μm, and pine is than being 1.25 ~ 1.5g/cm
3molybdenum powder as raw material;
Second step, pressed bar
The molybdenum powder first step chosen loads in cylindrical mold, again the mould installing molybdenum powder is put into cold isostatic press to suppress, and the pressure of cold isostatic press being set to 180 ~ 200Mpa, pressurize 8 ~ 15 minutes again after compacting, obtained diameter is the molybdenum rod blank of 68 ~ 100mm;
3rd step, sintering molybdenum rod blank
Molybdenum rod blank obtained for second step is loaded in intermediate frequency furnace, and be filled with hydrogen in stove, then carry out segmented sintering, again molybdenum rod blank is cooled after sintering; Sintering and cooling procedure in, the flow of hydrogen is 0.7 ~ 1.0m
3/ h;
Segmented sintering described in 3rd step is specially: first heat and within 3 ~ 4 hours, make furnace temperature rise to 1000 DEG C from 20 DEG C, be then incubated 1.5 ~ 2.5 hours; Heat 1.5 little of 1250 DEG C, be incubated 2.5 hours; Heat 1.5 little of 1400 DEG C, be incubated 2.5 ~ 4 hours; Heat 2 little of 1600 DEG C, be incubated 3.5 ~ 4 hours; Heat 2 little of 1800 DEG C, be incubated 2.5 ~ 3.5 hours; Heat 2 little of 1850 DEG C, be incubated 5 ~ 7 hours, heating 2 is little of 1900 DEG C, is incubated 5 ~ 6 hours;
4th step, more directly
Molybdenum rod blank through the 3rd step process is put into four-column hydraulic press comparatively straight, more straight temperature is set to 1300 ~ 1350 DEG C, and the heat time is 60 minutes, makes the flexibility of molybdenum rod blank be not more than 5mm;
5th step, forging
Forge carrying out carrying out multi-pass after a fire heats through more straight molybdenum rod blank, obtained molybdenum electrode bar;
The heating carrying out multi-pass after a fire heating described in 5th step forges, be specially: at the temperature of 1500 DEG C, heat 20 minutes, then, precise forging machine carries out forging of multi-pass to molybdenum rod blank, the diameter that first passage forges rear molybdenum rod blank reduces by 12 ~ 21mm, and the diameter that the second passage forges rear molybdenum rod blank reduces by 3 ~ 16mm, and the diameter that the 3rd passage forges rear molybdenum rod blank reduces by 1 ~ 4mm.
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| CN104439236B (en) * | 2014-12-23 | 2016-08-17 | 金堆城钼业股份有限公司 | A kind of preparation method of zirconium oxide molybdenum alloy electrode |
| CN104690268A (en) * | 2015-02-25 | 2015-06-10 | 成都易态科技有限公司 | Method and device for performing in-furnace straightening on sintering blank |
| CN107914016B (en) * | 2017-11-08 | 2020-12-15 | 金堆城钼业股份有限公司 | Production method of molybdenum strip |
| CN108356190A (en) * | 2018-01-31 | 2018-08-03 | 金堆城钼业股份有限公司 | A method of big specification molybdenum electrode is produced using large piece weight molybdenum stick |
| CN109014189B (en) * | 2018-08-27 | 2020-11-06 | 广州市石基耐火材料厂 | Molybdenum electrode and preparation method thereof |
| CN109014230B (en) * | 2018-08-31 | 2021-11-05 | 金堆城钼业股份有限公司 | Preparation method of molybdenum metal grid |
| CN110453166B (en) * | 2019-09-17 | 2020-10-09 | 厦门钨业股份有限公司 | Preparation method for improving plasticity of pure molybdenum block |
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