CN101596596A - A kind of sintering cemented carbide technology and the vacuum-sintering all-in-one oven that comes unstuck - Google Patents
A kind of sintering cemented carbide technology and the vacuum-sintering all-in-one oven that comes unstuck Download PDFInfo
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- CN101596596A CN101596596A CNA2009100437991A CN200910043799A CN101596596A CN 101596596 A CN101596596 A CN 101596596A CN A2009100437991 A CNA2009100437991 A CN A2009100437991A CN 200910043799 A CN200910043799 A CN 200910043799A CN 101596596 A CN101596596 A CN 101596596A
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Abstract
A kind of sintering cemented carbide technology is with the molded workpiece agglomerating chamber of packing into, starts vavuum pump and vacuumizes and start and takes out the glue pump, is warming up to 330～350 ℃, makes the adhesive gasification, at this moment, and the adhesive gas extraction agglomerating chamber after taking out the glue pump and will gasify; Then, continue to be warming up to 630～660 ℃, make remaining adhesive gas cracking in the stove, finish come unstuck after, continue to be evacuated to 140～160Pa, be warming up to 1410～1480 ℃ simultaneously, finish sintering.A kind of carbide alloy of the present invention vacuum-sintering all-in-one oven that comes unstuck comprises: body of heater, incubator, agglomerating chamber, collection glue jar, take out glue pump, vavuum pump; Technological design of the present invention is reasonable, device structure is simple, easy to operate, integrate and come unstuck and vacuum-sintering, can effectively improve the product sintering quality; Shorten the sintering period, energy savings effectively reduces product sintering cost; But the scope of sintered products is wide; Equipment manufacturing cost is low; Production process safety; Be suitable for renewal product as existing sintering cemented carbide equipment.
Description
Technical field
The present invention relates to cemented carbide sintering technology and apparatus field, be meant a kind of sintering cemented carbide technology and the vacuum-sintering all-in-one oven that comes unstuck especially.
Background technology
Two kinds of technologies of the general employing of traditional sintering cemented carbide technology, a kind of technology is the carbide alloy blank directly to be heated to 1400～1450 ℃ carry out sintering in vacuum sintering furnace; Another kind of technology is that the carbide alloy blank is placed the heating furnace that comes unstuck, progressively be warming up to about 800 ℃, insulation, simultaneously, air inlet and gas outlet are set on body of heater, burner hearth are fed hydrogen, light the hydrogen of discharge in the gas outlet by air inlet, according to the color of exhaust outlet combustion of hydrogen flame, judge the degree of coming unstuck; After coming unstuck, be cooled to room temperature, then, adopt conventional sintering process to carry out sintering.Above-mentioned two kinds of sintering process respectively have its pluses and minuses, first kind of sintering process, have simple to operate, equipment manufacturing cost is low, and technology easily is provided with, and sintering time is short, the advantage that the place occupied area is little, but, because the restriction of its sintering process and equipment can only be applicable to that the C total content is at the product of 5.88%-5.92% in the alloy, therefore, the carbon point of tungsten carbide is interval narrow in the alloy of its suitable sintering.In addition, owing to the binder removal system is not set, therefore, will inevitably adheres to cull in heat preservation carbon felt, the body of heater, on the one hand, it is uneven that the stove inner cylinder body is conducted heat, and causes shell deformation for a long time, and temperature homogeneity reduces in the stove, the product that sintering comes out is inconsistent because of atmosphere inequality color, the quality instability particularly is not suitable for the high cobalt product of sintering, as YG15 and YG20C etc.; On the other hand, sealing carbon felt needs regularly to change, (service life of whole equipment is short).
And existing logical hydrogen comes unstuck and adds the technology of vacuum-sintering, then has to come unstuck totally, can be adapted in the alloy that the C total content is at the sintering of the product of 5.88%-6.18%, and burner hearth is clean, and atmosphere is even, and percent defective is low, and constant product quality is adapted to the sintering of high cobalt product.But because the restriction of its technology causes its production total time long, omnidistance about 20 hours; The cost of equipment investment is big, production site (floor height) is required high; Because of hydrogen belongs to flammable explosive gas, careless slightly, then set off an explosion easily, safety coefficient is low; After coming unstuck, semi-finished product are exposed in the air and cool off, the very easily oxidation of fine grained carbide, therefore, incompatible sintering to the fine grained product; The energy consumption height; Production efficiency is low.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art and provide that a kind of technological design is reasonable, device structure is simple, easy to operate, integrate and come unstuck and a kind of sintering cemented carbide technology of vacuum-sintering and the vacuum-sintering all-in-one oven that comes unstuck.
A kind of sintering cemented carbide technology of the present invention comprises following processing step:
The first step, moulding
According to the shape of workpiece, cemented carbide powder is mixed compression moulding with adhesive;
Second goes on foot, comes unstuck
With the molded workpiece shove charge of the first step, vacuumize and keep the interior vacuum of stove at 75～85Pa, start and take out the glue pump, 1～2 ℃/min of control heating rate is warming up to 330～350 ℃, and insulation 50～80min makes the adhesive gasification; Then, continue to be warming up to 630～660 ℃, insulation 50～80min makes remaining adhesive gas cracking in the stove, finishes and comes unstuck;
The 3rd step, sintering
Behind second EOS, continue to be evacuated to 140～160Pa, be warming up to 1410～1480 ℃ simultaneously, insulation 50～70min, heating rate is controlled at 2～8 ℃/min, finishes sintering.
A kind of carbide alloy of the present invention vacuum-sintering all-in-one oven that comes unstuck comprises: body of heater, incubator, agglomerating chamber, collection glue jar, take out glue pump, vavuum pump; Described body of heater is made up of bracing frame and furnace shell, and described furnace shell is hollow cylinder and is packed on the support frame as described above; Described incubator cross section is square and is installed in the described furnace shell inner chamber; Described agglomerating chamber supports by the graphite pads that is packed in described incubator bottom surface and is installed in the described incubator, between described agglomerating chamber outer wall and incubator inwall electric heating element, heat-insulation layer is installed successively; Between described furnace shell and incubator shell, the cooling water pipe that is communicated with the peripheral hardware circulating water pipe is installed; Be provided with an end in the bottom of described furnace shell and be communicated with described agglomerating chamber, the other end and described collection glue is tank connected to go out sebific duct; Described collection glue jar is connected with the described glue pump of taking out by pipeline; On described furnace shell, also be provided with the vacuum orifice that the heat supply galvanic couple inserts the thermocouple locating hole in the described incubator and is connected with described vavuum pump.
A kind of carbide alloy of the present invention comes unstuck in the vacuum-sintering all-in-one oven, and described vavuum pump is driven by frequency control motor.
Operation principle of the present invention is sketched in following:
With the molded workpiece agglomerating chamber of packing into, start vavuum pump and vacuumize and keep the interior vacuum of stove at 75～85Pa, start and take out the glue pump, 1～2 ℃/min of control heating rate is warming up to 330～350 ℃, insulation 50～80min, make adhesive gasification, at this moment, the adhesive gas extraction agglomerating chamber after taking out the glue pump and will gasify, major part is cooled to liquid glue in collection glue jar, few part drains into outdoor by taking out the glue pump; Then, continue to be warming up to 630～660 ℃, insulation 50～80min makes remaining adhesive gas cracking in the stove, and the adhesive after the cracking is also extracted agglomerating chamber out by taking out the glue pump, finish come unstuck after, continue to be evacuated to 140～160Pa, be warming up to 1410～1480 ℃ simultaneously, insulation 50～70min, heating rate is controlled at 2～8 ℃/min, finishes sintering.
The present invention has following advantage owing to adopt above-mentioned process and device:
1, sintering comes unstuck and all once finishes in stove, has avoided the logical hydrogen back semi-finished product that come unstuck to be exposed in the air the easily shortcoming of oxidation, effectively improves the product sintering quality; Simultaneously, can shorten the sintering period, energy savings effectively reduces product sintering cost.
2, adhesive is by gasification, two steps of cracking, come unstuck fully, effectively reduce cull and stick to probability on carbon felt, the furnace wall, effectively improve the uniformity that the stove inner cylinder body conducts heat, improve the uniformity of temperature in the burner hearth, effectively improve each uniformity behind the product sintering to performance.
But the scope of 3 sintered products is wide, on the one hand, because the back semi-finished product of having avoided coming unstuck are exposed in the air the easily shortcoming of oxidation, and therefore, not only can the bigger product of sintering component particles, more can sintering fine grained product; On the other hand owing to come unstuck fully, and under vacuum state sintering, therefore, be suitable in the alloy C total content at the sintering of the complete series product of 5.88%-6.18%.
4, equipment volume is little, floor space and occupying little space, and cost is low.
5, production process safety has been stopped the logical combustion of hydrogen of former employing and has been come unstuck, and the phenomenon of hydrogen explosion easily takes place.
In sum, technological design of the present invention is reasonable, device structure is simple, easy to operate, integrate and come unstuck and vacuum-sintering, can effectively improve the product sintering quality; Shorten the sintering period, energy savings effectively reduces product sintering cost; But the scope of sintered products is wide; Equipment manufacturing cost is low; Production process safety; Be suitable for renewal product as existing sintering cemented carbide equipment.
Description of drawings
Accompanying drawing is the come unstuck structural representation of vacuum-sintering all-in-one oven of a kind of carbide alloy of the present invention.
Among the figure: 1---body of heater, 2---incubator, 3---agglomerating chamber, 4---collection glue jar, 5---take out glue pump, 6---vavuum pump.
The specific embodiment
Below in conjunction with accompanying drawing a kind of carbide alloy of the present invention vacuum-sintering all-in-one oven that comes unstuck is described in further detail.
Referring to accompanying drawing, a kind of carbide alloy of the present invention vacuum-sintering all-in-one oven that comes unstuck comprises: body of heater 1, incubator 2, agglomerating chamber 3, collection glue jar 4, take out glue pump 5, vavuum pump 6; Described body of heater 1 is made up of bracing frame 7 and furnace shell 8, and described furnace shell 8 is hollow cylinder and is packed on the support frame as described above 7; Described incubator 2 cross sections are square and are installed in described furnace shell 8 inner chambers; Described agglomerating chamber 3 supports by the graphite pads 9 that is packed in described incubator 2 bottom surfaces and is installed in the described incubator 2, between described agglomerating chamber 3 outer walls and incubator 2 inwalls electric heating element 10, heat-insulation layer 11 is installed successively; Between described furnace shell 8 and incubator 2 shells, the cooling water pipe 12 that is communicated with the peripheral hardware circulating water pipe is installed; Be provided with an end in the bottom of described furnace shell 8 and be communicated with described agglomerating chamber 3, the other end is connected with described collection glue jar 4 goes out sebific duct 13; Described collection glue jar 4 is connected with the described glue pump 5 of taking out by pipeline; On described furnace shell 8, also be provided with the vacuum orifice 15 that the heat supply galvanic couple inserts the thermocouple locating hole 14 in the described incubator 2 and is connected with the described vavuum pump 6 that is driven by frequency control motor.
Below in conjunction with specific embodiment, a kind of sintering cemented carbide technology of the present invention is described further.
Embodiment 1:
The first step, moulding
According to the shape of workpiece, get the YG8 cemented carbide powder and mix compression moulding with resin glue;
Second goes on foot, comes unstuck
With the molded workpiece shove charge of the first step, vacuumize and keep the interior vacuum of stove at 75Pa, start and take out the glue pump, 1 ℃/min of control heating rate is warming up to 330 ℃, and insulation 50min makes the adhesive gasification; Then, continue to be warming up to 650 ℃, insulation 50min makes remaining adhesive gas cracking in the stove, finishes and comes unstuck;
The 3rd step, sintering
Behind second EOS, continue to be evacuated to 140Pa, be warming up to 1410 ℃ simultaneously, insulation 50min, heating rate is controlled at 2 ℃/min, finishes sintering.
Products obtained therefrom after testing, performance parameter is: porosity reaches: A02, B00 level; Non-chemical combination carbon content is: the C00 level; Bending strength 2300MPa, proportion is: 14.78g/cm3, hardness is: HRA 89.5.
Embodiment 2:
The first step, moulding
According to the shape of workpiece, get the YG8 cemented carbide powder and mix compression moulding with resin glue;
Second goes on foot, comes unstuck
With the molded workpiece shove charge of the first step, vacuumize and keep the interior vacuum of stove at 80Pa, start and take out the glue pump, 1.5 ℃/min of control heating rate is warming up to 340 ℃, and insulation 65min makes the adhesive gasification; Then, continue to be warming up to 640 ℃, insulation 65min makes remaining adhesive gas cracking in the stove, finishes and comes unstuck;
The 3rd step, sintering
Behind second EOS, continue to be evacuated to 150Pa, be warming up to 1450 ℃ simultaneously, insulation 60min, heating rate is controlled at 5 ℃/min, finishes sintering.
Products obtained therefrom after testing, performance parameter is: porosity reaches: A02, B00 level; Non-chemical combination carbon content is: the C00 level; Bending strength 2400MPa, proportion is: 14.82g/cm3, hardness is: HRA 89.4.
Embodiment 3:
The first step, moulding
According to the shape of workpiece, get YG10x cemented carbide powder and resin glue mixing compression moulding;
Second goes on foot, comes unstuck
With the molded workpiece shove charge of the first step, vacuumize and keep the interior vacuum of stove at 85Pa, start and take out the glue pump, 2 ℃/min of control heating rate is warming up to 350 ℃, and insulation 80min makes the adhesive gasification; Then, continue to be warming up to 660 ℃, insulation 80min makes remaining adhesive gas cracking in the stove, finishes and comes unstuck;
The 3rd step, sintering
Behind second EOS, continue to be evacuated to 160Pa, be warming up to 1480 ℃ simultaneously, insulation 70min, heating rate is controlled at 8 ℃/min, finishes sintering.
Products obtained therefrom after testing, performance parameter is: porosity reaches: A02, B00 level; Non-chemical combination carbon content is: the C00 level; Bending strength 2450MPa, proportion is: 14.90-15.04g/cm3, hardness is: HRA 91.8.
To Billy 1:
With the shove charge of YG8 carbide alloy workpiece, be warming up to 1430 ℃, be incubated 30-50 minute, with stove cooling, products obtained therefrom after testing, performance parameter is: porosity reaches: A04, B02 level; Non-chemical combination carbon content is: the C00 level; Bending strength 1900MPa, proportion is: 14.8g/cm3, hardness is: HRA 91.8.
To Billy 2
With the shove charge of YG10x carbide alloy workpiece, be warming up to 1480 ℃, be incubated 30-50 minute, with stove cooling, products obtained therefrom after testing, performance parameter is: porosity reaches: A04, B02 level; Non-chemical combination carbon content is: the C00 level; Bending strength 1800MPa, proportion is: 14.7-15g/cm3, hardness is: HRA 91.5.
Specific embodiment of the invention products obtained therefrom and Comparative Examples products obtained therefrom are compared, as can be known: the carbide alloy that adopts process sintering of the present invention, its porosity, bending strength obviously are better than the product that conventional sintering cemented carbide technology is produced, and hardness, proportion do not have notable difference.
Claims (3)
1, a kind of sintering cemented carbide technology comprises following processing step:
The first step, moulding
According to the shape of workpiece, cemented carbide powder is mixed compression moulding with adhesive;
Second goes on foot, comes unstuck
With the molded workpiece shove charge of the first step, vacuumize and keep the interior vacuum of stove at 75～85Pa, start and take out the glue pump, 1～2 ℃/min of control heating rate is warming up to 330～350 ℃, and insulation 50～80min makes the adhesive gasification; Then, continue to be warming up to 630～660 ℃, insulation 50～80min makes remaining adhesive gas cracking in the stove, finishes and comes unstuck;
The 3rd step, sintering
Behind second EOS, continue to be evacuated to 140～160Pa, be warming up to 1410～1480 ℃ simultaneously, insulation 50～70min, heating rate is controlled at 2～8 ℃/min, finishes sintering.
2, a kind of carbide alloy vacuum-sintering all-in-one oven that comes unstuck comprises: body of heater, incubator, agglomerating chamber, collection glue jar, take out glue pump, vavuum pump; It is characterized in that: described body of heater is made up of bracing frame and furnace shell, and described furnace shell is hollow cylinder and is packed on the support frame as described above; Described incubator cross section is square and is installed in the described furnace shell inner chamber; Described agglomerating chamber supports by the graphite pads that is packed in described incubator bottom surface and is installed in the described incubator, between described agglomerating chamber outer wall and incubator inwall electric heating element, heat-insulation layer is installed successively; Between described furnace shell and incubator shell, the cooling water pipe that is communicated with the peripheral hardware circulating water pipe is installed; Be provided with an end in the bottom of described furnace shell and be communicated with described agglomerating chamber, the other end and described collection glue is tank connected to go out sebific duct; Described collection glue jar is connected with the described glue pump of taking out by pipeline; On described furnace shell, also be provided with the vacuum orifice that the heat supply galvanic couple inserts the thermocouple locating hole in the described incubator and is connected with described vavuum pump.
3, a kind of carbide alloy according to claim 2 vacuum-sintering all-in-one oven that comes unstuck, it is characterized in that: described vavuum pump is driven by frequency control motor.
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| CN102376444A (en) * | 2011-08-25 | 2012-03-14 | 天长市中德电子有限公司 | Magnetic core sintering method and device |
| CN101798229B (en) * | 2009-12-10 | 2013-05-22 | 洛阳神佳窑业有限公司 | Full fiber ceramic body glue discharging method and kiln |
| CN103438697A (en) * | 2013-09-04 | 2013-12-11 | 四川有色金源粉冶材料有限公司 | Sintering furnace and method for removing grease and adhesive |
| CN103464760A (en) * | 2013-09-10 | 2013-12-25 | 苏州米莫金属科技有限公司 | Conveniently-cleaned metal powder vacuum sintering furnace with condensing device |
| CN105618759A (en) * | 2016-01-29 | 2016-06-01 | 柳州市安龙机械设备有限公司 | Sintering method for cemented carbide blade |
| CN107321987A (en) * | 2017-07-21 | 2017-11-07 | 四川大学 | Multiple physical field couples superfast sintering integrated equipment |
| CN109556403A (en) * | 2017-09-26 | 2019-04-02 | 自贡兆强密封制品实业有限公司 | Dewax degumming sintering integrated furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101798229B (en) * | 2009-12-10 | 2013-05-22 | 洛阳神佳窑业有限公司 | Full fiber ceramic body glue discharging method and kiln |
| CN102376444A (en) * | 2011-08-25 | 2012-03-14 | 天长市中德电子有限公司 | Magnetic core sintering method and device |
| CN102376444B (en) * | 2011-08-25 | 2016-01-20 | 天长市中德电子有限公司 | A kind of sintering method of magnetic core |
| CN103438697A (en) * | 2013-09-04 | 2013-12-11 | 四川有色金源粉冶材料有限公司 | Sintering furnace and method for removing grease and adhesive |
| CN103464760A (en) * | 2013-09-10 | 2013-12-25 | 苏州米莫金属科技有限公司 | Conveniently-cleaned metal powder vacuum sintering furnace with condensing device |
| CN105618759A (en) * | 2016-01-29 | 2016-06-01 | 柳州市安龙机械设备有限公司 | Sintering method for cemented carbide blade |
| CN107321987A (en) * | 2017-07-21 | 2017-11-07 | 四川大学 | Multiple physical field couples superfast sintering integrated equipment |
| CN109556403A (en) * | 2017-09-26 | 2019-04-02 | 自贡兆强密封制品实业有限公司 | Dewax degumming sintering integrated furnace |
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Open date: 20091209 |