CN103978210A - Vacuum and protective atmosphere sintering furnace of metal powder injection molding part - Google Patents
Vacuum and protective atmosphere sintering furnace of metal powder injection molding part Download PDFInfo
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- CN103978210A CN103978210A CN201410248546.9A CN201410248546A CN103978210A CN 103978210 A CN103978210 A CN 103978210A CN 201410248546 A CN201410248546 A CN 201410248546A CN 103978210 A CN103978210 A CN 103978210A
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Abstract
The invention relates to the technical field of vacuum sintering furnaces, in particular to a vacuum and protective atmosphere sintering furnace of a metal powder injection molding part. The vacuum and protective atmosphere sintering furnace comprises a furnace shell and furnace supporting frames used for supporting the furnace shell, and doors are formed at the two ends of the furnace shell. A cubic heat preservation and insulation screen is arranged in the furnace shell, three sets of heating bodies are arranged in the heat preservation and insulation screen, the heating bodies are molybdenum sheet heating bodies and are fixedly connected with the furnace shell through a product supporting frame, and the heating bodies are connected with a molybdenum electrode. The molybdenum sheet heating bodies are arranged in the furnace shell, and are made of high-purity molybdenum materials, therefore, the vacuum and protective atmosphere sintering furnace can achieve not only a vacuum sintering mode but also an atmosphere sintering mode, not only inert gas but also the atmosphere of combustible gas can be adopted in the atmosphere sintering mode for atmosphere sintering, and therefore vacuum sintering and atmosphere sintering can be converted and used according to the sintering needs of materials, the equipment utilization rate is improved, and sintering efficiency can be improved.
Description
Technical field
The present invention relates to vacuum sintering furnace technical field, be specifically related to the dual-purpose sintering furnace of vacuum protection atmosphere of metal powder injection molded part.
Background technology
In existing metal powder injection molded part manufacture process, its part need to carry out degreasing sintered and vacuum-sintering at atmosphere sintering furnace and vacuum sintering furnace by material, and two kinds of sintering furnace sintering processes are as follows:
Its vacuum sintering furnace sintering process is: pack metal powder injection molded part into vacuum sintering furnace, first start vavuum pump, lobe pump, to being evacuated in stove in high vacuum 10Pa, under vacuum environment, carry out again vacuum-sintering, when sintering, then pass into the inert gases such as nitrogen, argon gas, make volatile matter in semi-finished product, with air-flow, flow out, make the physical and chemical index of product reach designing requirement.Its atmosphere sintering furnace sintering process is: pack metal powder injection molded part into atmosphere sintering furnace, open vavuum pump, to extracting vacuum in stove; then, under vacuum environment, in stove, pass into a certain amount of protective atmosphere again, after vacuum is pressure-fired in stove; opening pressure control valve, remaining oxygen in cleaning oven, after emptying 20 minutes; pass into again fuel gas gas; point burner, carries out atmosphere sintering, and sintering temperature is to the condition of high temperature to 1600 degree Celsius; after sintering finishes, be down to gradually room temperature.The deficiency existing in order to overcome above-mentioned sintering furnace, above-mentioned two kinds of sintering processes need to be integrated, a patent documentation is found in literature search through prior art, wherein, Chinese invention patent Granted publication number is CN 101655310 B, name is called: " 1800 degree protective atmosphere vacuum sintering furnace with high temperature ", its control system is connected with the automatically controlled execution unit being arranged in vacuum sintering furnace, in heating clamber, be provided with graphite grazing case, entering of high-temperature vacuum sintering furnace, blast pipe is connected with graphite grazing case, it is characterized in that sintering furnace applicable craft atmosphere sintering and vacuum-sintering, and implement function Change measure by control program, this atmosphere vacuum sintering furnace process control: preparation is the power supply that checks vacuum sintering furnace, source of the gas, water source, on touch-screen, work out heating process flow process, start vacuum sintering furnace, to vacuumizing in stove, two kinds of purposes are selected, and the one, heating in vacuum, according to the heating process flow content of establishment, under vacuum state, automatically start heating schedule, to vacuum sintering furnace heating, according to the heating process flow process intensification of establishment, be finally warmed up to 1700-1800 ℃, keep heating process flow process to want seeking time, another kind of protective atmosphere sintering purposes: the heating process flow content according to establishment, seal box in stove is filled with to inert gas, after having inflated, automatically start heating schedule, finally rise to 1700-1800 ℃, keep heating process flow process to want seeking time, the common step of using of above-mentioned two kinds of purposes: heating process finishes, stop heating, start nature cooling, cool to after the temperature of setting, continue to be filled with inert gas, then start blower fan, vacuum sintering furnace enters pressure cooling procedure, cool to after the temperature of setting, continue coolingly, and start timing, cooling stopping after arrival setting-up time, comes out of the stove.But what adopt due to its calandria of this atmosphere vacuum sintering furnace is graphite grazing case, easily produces carburizing during sintering, requires high material (C:0.10% is following) not use for phosphorus content.The atmosphere of another its use is inert gas, can not use reducing gas, can not guarantee that the carbon content in material meets the requirements completely, and its final sintering finished impact, tensile property can not meet the demands.
Summary of the invention
The object of this invention is to provide and a kind ofly can require to realize the conversion of vacuum-sintering and atmosphere sintering according to the sintering of material and use, not only improve utilization rate of equipment and installations, and can improve the dual-purpose sintering furnace of vacuum protection atmosphere of the metal powder injection molded part of sintering efficiency.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: the dual-purpose sintering furnace of vacuum protection atmosphere of metal powder injection molded part, comprises the furnace shell opening the door at two ends, the support frame of furnace body that supports described furnace shell; The side's of being provided with body thermal insulation separation heat shielding in described furnace shell, is provided with three groups of calandrias in described thermal insulation separation heat shielding, described calandria is molybdenum sheet calandria, and described calandria is fixedly connected with described furnace shell by product bracing frame, and described calandria is connected with molybdenum electrode; The top of described furnace shell is provided with temperature thermocouple, and described temperature thermocouple is connected with thermal insulation separation heat shielding and with described calandria through described furnace shell successively; Air inlet pipe communicates with thermal insulation separation heat shielding through described furnace shell, and escape pipe communicates with thermal insulation separation heat shielding through described furnace shell, and vavuum pump is connected with described furnace shell by pipeline.
Further, described thermal insulation separation heat shielding is comprised of internal layer molybdenum sheet thermal insulation layer, intermediate course Zirconium oxide fibre carpet veneer and outer stainless steel metal layer.
Further, the top of described furnace shell is also provided with anti-explosion safety relief valve.
Further, described air inlet pipe is provided with gas flowmeter and the first stainless-steel vacuum ball valve.
Further, described escape pipe is provided with combustion controller and the second stainless-steel vacuum ball valve.
The present invention is the equipment that high-temperature vacuum sintering technology is combined with gas shield heating technique, and the control system of sintering furnace and technique are matched, and has designed two kinds of corresponding programs, and the translation function of atmosphere sintering and vacuum-sintering is provided.Can vacuum-sintering, also can after forvacuum, be filled with again protective gas heating, and in slight positive pressure state, carry out protective atmosphere sintering always.The volatile matter foreign gas that material in sintering process discharges is recycled mobile protective gas and takes away and discharge out of the furnace, so this equipment also has (fat) function of coming unstuck, and (binding agent) sintering that can be used for coming unstuck once completes.
The present invention has following beneficial effect: the dual-purpose sintering furnace of vacuum protection atmosphere of metal powder injection molded part of the present invention, first in furnace shell, be provided with molybdenum sheet calandria, different from the graphite grazing case that prior art adopts, this molybdenum sheet calandria is High-Purity Molybdenum material, applicable to vacuum-sintering, also can be used for atmosphere sintering, under protective atmosphere, can realize high temperature sintering; Secondly, unlike the prior art, this sintering furnace not only can be at sintering under vacuum mode, owing to adopting molybdenum sheet calandria in above-mentioned furnace shell, according to the characteristic of Mo, when sintering, can use inert gas, also can use the atmosphere sintering of fuel gas, thereby be applicable to phosphorus content, require metal powder injection molded part material lower and that material performance requirement is higher, solved problems of the prior art simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the longitudinal section view of Fig. 1.
Fig. 3 is control program block diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
As shown in Figure 1 and Figure 2, the dual-purpose sintering furnace of vacuum protection atmosphere of metal powder injection molded part, comprises the furnace shell 2 opening the door at two ends, the support frame of furnace body 1 that supports described furnace shell 2, and this furnace shell 2 is cylinder, axially horizontally disposed, support frame of furnace body 1 plays the effect of supporting whole body of heater, the side's of being provided with body thermal insulation separation heat shielding 3 in described furnace shell 2, wherein, this thermal insulation separation heat shielding 3 is by internal layer molybdenum sheet thermal insulation layer 13, intermediate course Zirconium oxide fibre carpet veneer 14 and outer stainless steel metal layer 15 adopt molybdenum bolt fixedly to step up, form insulating, play insulation, heat insulation, improve thermal-radiating effect, in described thermal insulation separation heat shielding 3, be provided with three groups of calandrias 4, described calandria 4 is molybdenum sheet calandria, described calandria 4 is fixedly connected with described furnace shell 2 by product bracing frame 10, described calandria 4 is connected with molybdenum electrode 11, in the present embodiment, owing to having adopted molybdenum sheet calandria, therefore according to the characteristic of Mo, when sintering, not only can use inert gas, also can use the atmosphere sintering of fuel gas, wherein, inert gas refers generally to nitrogen, argon gas etc., fuel gas refers generally to ammonia and decomposes, hydrogen etc., above-mentioned process gas is applicable to the sintering that phosphorus content requires lower and the metal powder injection molded part material that material performance requirement is higher, the top of described furnace shell 2 is provided with temperature thermocouple 12, and described temperature thermocouple 12 is connected with thermal insulation separation heat shielding 3 and with described calandria 4 through described furnace shell 2 successively, by temperature thermocouple 12, can measure the actual temperature in stove, air inlet pipe 7 communicates with thermal insulation separation heat shielding 3 through described furnace shell 2, by this air inlet pipe 7, protection gas directly can be delivered to body of heater inside, escape pipe 6 communicates with thermal insulation separation heat shielding 3 through described furnace shell 2, by escape pipe 6, protective gas can be led to outside stove by outlet pipe, vavuum pump 8 is connected with described furnace shell 2 by pipeline, and starting vavuum pump 8 can be extracted out the gas in stove by vavuum pump 8.
As shown in Figure 1 and Figure 2, the top of described furnace shell 2 is also provided with anti-explosion safety relief valve 5, and this anti-explosion safety relief valve 5 is when protective atmosphere sintering superpressure, and safety relief, plays safeguard protection effect.
As shown in Figure 1 and Figure 2; described air inlet pipe 7 is provided with gas flowmeter 17 and the first stainless-steel vacuum ball valve 16; by gas flowmeter 17, can record air inflow situation, by the first stainless-steel vacuum ball valve 16, can control whether in stove, carry protective gas simultaneously.
As shown in Figure 1 and Figure 2; described escape pipe 6 is provided with combustion controller 9 and the second stainless-steel vacuum ball valve 18; by the second stainless-steel vacuum ball valve 18, can control and whether the protective gas in stove is delivered to outside stove by outlet pipe, adopt combustion controller 9 residual gas of getting rid of in stove can be burnt at exit naked light.
The control program of technological process of the present invention: adopt 14 inches of man-machine interface touch-screens as the center of control system, by temperature controller, the information such as power controller control signal, measured temperature, vacuum value, charge flow rate, pressure control are fed back to control system center.Temperature is controlled the temperature acquisition signal of accepting stove thermocouple, after instrument PID computing, controls the power output size of power of controlled silicon controller, makes stove heating power continous-stable, adjustable.Pressure during atmosphere sintering is controlled, and adopts a pressure controller table, accepts the input signal of stove pressure sensor, PID computing through instrument itself, by port of export combustion controller, regulate pipeline valve opening size, regulating stove internal pressure, reaches controlled pressure object.Checkout facility electrical apparatus control system, source of the gas, water source, establishment heating control flow, when fuel gas atmosphere sintering, start vavuum pump 8, to being evacuated to high vacuum in stove, close each valve of each pump, open again air inlet pipeline, gas flowmeter 17, in stove, pass into fuel gas (reducibility gas), while reaching pressure-fired, open outlet pipe valve, outside emptying cleaning.Clean after ten minutes ignition combustion controller 9, the fuel gas of discharging in burn off stove.Start heating power supply, operation sintering process program, carries out fuel gas atmosphere sintering pattern.When inert gas atmosphere sintering, start vavuum pump 8, to being evacuated to high vacuum in stove, close each valve of each pump, then open air inlet pipeline, gas flowmeter 17, in stove, pass into inert gas, while reaching pressure-fired, open outlet pipe valve, outside emptying cleaning.Clean after ten minutes ignition combustion controller 9, the inert gas of discharging in burn off stove.Start heating power supply, operation sintering process program, carries out fuel gas atmosphere sintering pattern.When vacuum-sintering pattern, close inlet, outlet pipe valve, open vavuum pump 8, operation heating schedule, realizes vacuum-sintering pattern, after sintering completes, stops heating schedule, enters nature cooling, when furnace temperature is down to room temperature, can come out of the stove.
In sum, this dual-purpose sintering furnace both can have been realized vacuum-sintering pattern, also can realize atmosphere sintering pattern, and atmosphere sintering pattern not only can be used inert gas, also can use the atmosphere sintering of fuel gas, thereby can require to realize vacuum-sintering and atmosphere sintering conversion use according to the sintering of material, not only improve utilization rate of equipment and installations, and can improve sintering efficiency.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other modifications that those of ordinary skills make technical scheme of the present invention or be equal to replacement, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. the dual-purpose sintering furnace of the vacuum protection atmosphere of metal powder injection molded part, is characterized in that, comprises the furnace shell (2) opening the door at two ends, the support frame of furnace body (1) that supports described furnace shell (2); The side's of being provided with body thermal insulation separation heat shielding (3) in described furnace shell (2), in described thermal insulation separation heat shielding (3), be provided with three groups of calandrias (4), described calandria (4) is molybdenum sheet calandria, described calandria (4) is fixedly connected with described furnace shell (2) by product bracing frame (10), and described calandria (4) is connected with molybdenum electrode (11); The top of described furnace shell (2) is provided with temperature thermocouple (12), and described temperature thermocouple (12) is connected with thermal insulation separation heat shielding (3) and with described calandria (4) through described furnace shell (2) successively; Air inlet pipe (7) communicates with thermal insulation separation heat shielding (3) through described furnace shell (2), and escape pipe (6) communicates with thermal insulation separation heat shielding (3) through described furnace shell (2), and vavuum pump (8) is connected with described furnace shell (2) by pipeline.
2. the dual-purpose sintering furnace of the vacuum protection atmosphere of metal powder injection molded part according to claim 1; it is characterized in that, described thermal insulation separation heat shielding (3) is comprised of internal layer molybdenum sheet thermal insulation layer (13), intermediate course Zirconium oxide fibre carpet veneer (14) and outer stainless steel metal layer (15).
3. the dual-purpose sintering furnace of the vacuum protection atmosphere of metal powder injection molded part according to claim 1, is characterized in that, the top of described furnace shell (2) is also provided with anti-explosion safety relief valve (5).
4. the dual-purpose sintering furnace of the vacuum protection atmosphere of metal powder injection molded part according to claim 1, is characterized in that, described air inlet pipe (7) is provided with gas flowmeter (17) and the first stainless-steel vacuum ball valve (16).
5. the dual-purpose sintering furnace of the vacuum protection atmosphere of metal powder injection molded part according to claim 1, is characterized in that, described escape pipe (6) is provided with combustion controller (9) and the second stainless-steel vacuum ball valve (18).
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Cited By (11)
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| CN106825580A (en) * | 2017-02-23 | 2017-06-13 | 深圳市星特烁科技有限公司 | A kind of catalysis degreasing stove with atmosphere purification function |
| CN107042303A (en) * | 2017-04-07 | 2017-08-15 | 海安县鹰球粉末冶金有限公司 | A kind of de- furnace apparatus of vacuum and atmosphere dual-purpose type heat |
| CN107309425A (en) * | 2017-08-18 | 2017-11-03 | 海安县鹰球粉末冶金有限公司 | A kind of metal powder injection molded extraction stove |
| CN107941019A (en) * | 2017-12-21 | 2018-04-20 | 宁夏昇力恒真空设备有限公司 | High-temperature atmosphere multiple stage circulation cooled super high sintering temperature stove |
| CN108870983A (en) * | 2018-07-11 | 2018-11-23 | 昆山金美创机械有限公司 | A kind of vacuum drying oven of optional intake method |
| CN110421162A (en) * | 2019-08-02 | 2019-11-08 | 金华中烨超硬材料有限公司 | The preparation process of combination grain composite polycrystal-diamond |
| CN112629248A (en) * | 2020-12-24 | 2021-04-09 | 福建技术师范学院 | Automatic detection device and method for vacuum atmosphere tube type electric furnace |
| CN112708749A (en) * | 2019-10-24 | 2021-04-27 | 清华大学 | Equipment and method for continuous heat treatment of spherical fuel elements |
| CN115070033A (en) * | 2022-05-11 | 2022-09-20 | 廖文权 | Continuous degreasing sintering furnace for metal powder |
| CN116538798A (en) * | 2023-04-28 | 2023-08-04 | 山田新材料集团有限公司 | Atmosphere control system and method for ultra-high temperature vacuum sintering furnace |
| CN117139620A (en) * | 2023-09-07 | 2023-12-01 | 海安县通用粉末冶金厂 | High-temperature sintering furnace for high-performance metal powder injection molding of titanium alloy and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107042303A (en) * | 2017-04-07 | 2017-08-15 | 海安县鹰球粉末冶金有限公司 | A kind of de- furnace apparatus of vacuum and atmosphere dual-purpose type heat |
| CN107309425A (en) * | 2017-08-18 | 2017-11-03 | 海安县鹰球粉末冶金有限公司 | A kind of metal powder injection molded extraction stove |
| CN107941019B (en) * | 2017-12-21 | 2023-10-03 | 昇力恒(宁夏)真空科技股份公司 | High-temperature atmosphere multistage circulation cooling type ultrahigh-temperature sintering furnace |
| CN107941019A (en) * | 2017-12-21 | 2018-04-20 | 宁夏昇力恒真空设备有限公司 | High-temperature atmosphere multiple stage circulation cooled super high sintering temperature stove |
| CN108870983A (en) * | 2018-07-11 | 2018-11-23 | 昆山金美创机械有限公司 | A kind of vacuum drying oven of optional intake method |
| CN110421162A (en) * | 2019-08-02 | 2019-11-08 | 金华中烨超硬材料有限公司 | The preparation process of combination grain composite polycrystal-diamond |
| CN112708749A (en) * | 2019-10-24 | 2021-04-27 | 清华大学 | Equipment and method for continuous heat treatment of spherical fuel elements |
| CN112629248A (en) * | 2020-12-24 | 2021-04-09 | 福建技术师范学院 | Automatic detection device and method for vacuum atmosphere tube type electric furnace |
| CN115070033A (en) * | 2022-05-11 | 2022-09-20 | 廖文权 | Continuous degreasing sintering furnace for metal powder |
| CN115070033B (en) * | 2022-05-11 | 2024-04-09 | 廖文权 | Continuous degreasing sintering furnace for metal powder |
| CN116538798A (en) * | 2023-04-28 | 2023-08-04 | 山田新材料集团有限公司 | Atmosphere control system and method for ultra-high temperature vacuum sintering furnace |
| CN116538798B (en) * | 2023-04-28 | 2023-12-15 | 山田新材料集团有限公司 | Atmosphere control system and method for ultra-high temperature vacuum sintering furnace |
| CN117139620A (en) * | 2023-09-07 | 2023-12-01 | 海安县通用粉末冶金厂 | High-temperature sintering furnace for high-performance metal powder injection molding of titanium alloy and use method thereof |
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