CN102962458B - Degreasing section structure of metal injection molded continuous sintering furnace - Google Patents
Degreasing section structure of metal injection molded continuous sintering furnace Download PDFInfo
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- CN102962458B CN102962458B CN201210491772.0A CN201210491772A CN102962458B CN 102962458 B CN102962458 B CN 102962458B CN 201210491772 A CN201210491772 A CN 201210491772A CN 102962458 B CN102962458 B CN 102962458B
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Abstract
The invention discloses a degreasing section structure of a metal injection molded continuous sintering furnace. A degreasing section is provided with at least one inert gas pipeline; the gas outlets of the inert gas pipelines are sectionally arranged in a degreasing-section furnace cavity; the degreasing section is provided with at least one carbon control gas pipeline at the same time; and the gas outlets of the carbon control gas pipelines are sectionally arranged in the degreasing-section furnace cavity. According to the degreasing section structure, the inert gas pipelines are sectionally arranged in the degreasing section and can adjust the flow quantities and the gas flow directions in different temperature areas according to the needs, so that the problems of equipment sealing and unreasonable gas flow can be effectively solved.
Description
Technical field
The present invention relates to PM technique, relate in particular to the sintering furnace of metal injection molded use.
Background technology
Metal injection molded is a kind of brand-new parts machining technology that is incorporated into field of powder metallurgy by Plastics Injection Molding Technology.Powder injection-molded can be as producing plastics, the parts that one-shot forming is very complicated.Powder injection-molded is the moulding of small complex parts and a revolution of processing processing technology.
At present, metal powder injection molding producer all adopts traditional thermoplasticity bonding system (polyester paraffin, polyester oil, polyester compound etc.), polyformaldehyde system etc.System difference, degreasing process difference.At present, solvent degreasing and catalysis degreasing are just in penetration and promotion.System difference, agglomerating plant is widely different.At present, popular is that agglomerating plant is vacuum sintering furnace (equipment).Continuous sintering furnace has obtained application at present aspect polyformaldehyde system, the Chinese utility model that is CN201311177 as notification number discloses a kind of sintering furnace on September 16th, 2009, it comprises body of heater, described body of heater is followed successively by degreasing section, sintering stage and cooling section from its import to outlet, this degreasing section, sintering stage and cooling section are linear arrangement; The porch of degreasing section is provided with fire door, between degreasing section and sintering stage, be provided with at least together with fire door, between sintering stage and cooling section, be provided with at least together with fire door, the exit of cooling section is provided with fire door; Described degreasing section and sintering stage are provided with heater, and cooling section is provided with cooling device; Described degreasing section, sintering stage and cooling section are provided with transmission mechanism.It adopts linear type structure, and degreasing in traditional MIM technique, sintering, the single operation such as cooling are integrated into comprehensive operation.
But the degreasing sintered equipment and technology of continous way is not mature enough, there are a lot of problems.Existing cerul, plasticity system, continous way agglomerating plant subject matter is that the sealing of degreasing section equipment and air-flow air feed are unreasonable, product lack of homogeneity.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of degreasing segment structure of metal injection molded continuous sintering furnace, effectively solution equipment sealing, the irrational problem of air-flow.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of metal injection molded continuous sintering furnace degreasing segment structure, it is characterized in that: degreasing section is provided with at least one inert gas pipeline, the gas outlet subsection setup of described inert gas pipeline is in degreasing section burner hearth, the section of degreasing is simultaneously provided with at least one control carbon gas pipeline, and the gas outlet subsection setup of described control carbon gas pipeline is in degreasing section burner hearth.
As preferably, described inert gas pipeline enters burner hearth from degreasing section left end, and described control carbon gas pipeline enters burner hearth from degreasing section right-hand member, and described inert gas pipeline and control carbon gas pipeline are provided with flow control valve.
As preferably, described degreasing section is provided with at least two cooling passages that are communicated with flues and body of heater outer air, and this cooling passage is the adjustable passage that can close and regulate throughput.
As preferably, the control carbon gas in described control carbon gas pipeline adopts decarburization atmosphere, and this decarburization atmosphere is H
2or H
2o or decomposed ammonia body or CO
2or O
2also or the combination of above-mentioned gas.
As preferably, long-pending wax tank is set below described degreasing section, described long-pending wax tank is provided with grafting wax mouth, inert gas entrance and exhaust-valve.
As preferably, described degreasing section is provided with sintered dimensions image acquistion system.
As preferably, described degreasing section adopts silicon carbide heater heating.
As preferably, described degreasing section is provided with a main temperature thermocouple and a tracking and temperature testing thermocouple, described main temperature thermocouple and and tracking and temperature testing thermocouple be connected with switch board, switch board is provided with a tracking overtemperature alarm.
As preferably, the connecting portion of described degreasing section and rear sintering stage is provided with sample tap, and described sample tap adopts upper shed or side opening mode.
The present invention sets up inert gas pipeline in the segmentation of degreasing section, and pipeline can carry out flow and airflow direction adjusting, effectively solution equipment sealing, the irrational problem of air-flow at different warm areas as required.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is the structural representation of continuous sintering furnace;
Fig. 2 is degreasing section inert gas pipeline structural representation;
Fig. 3 is the cooling vent hole structure schematic diagram of degreasing section;
Fig. 4 is the long-pending wax jar structure schematic diagram of degreasing section;
Fig. 5 is slow cooling section structural representation;
Fig. 6 is cooling section structural representation;
Fig. 7 is cooling section admission line structural representation;
Fig. 8 is gas distribution pipe structural representation in cooling section admission line;
Fig. 9 is temperature alarming device structural representation;
Figure 10 is temperature alarming device control principle schematic diagram.
Detailed description of the invention
Below in conjunction with continuous sintering furnace, the present invention is made and being illustrated.
As shown in Figure 1, for metal injection molded continuous sintering furnace, it comprises a combined type body of heater, the burner of described body of heater is provided with liftable fire door and charging aperture 6, stove tail are provided with liftable fire door and discharging opening 60, and described body of heater is disposed with degreasing section 1, sintering stage 2, slow cooling section 3, cooling section 4 from burner to stove tail.Described furnace binding is meshbeltfurnace or stepping beam type continuous oven; When employing pushes away boat structure sintering furnace, material boat size and fire box temperature are integral multiple relation.
Between described charging aperture 6 and discharging opening 60, adopt external cycling mechanism.This outer circulation mechanism adopts sprocket wheel, belt or gear drive to realize.
Described body of heater is provided with sample tap 150 on the linkage section 15 of degreasing section and sintering stage, and described sample tap adopts upper shed or side opening mode.This sample tap adopts mechanical pull bar or bolted mode to open or close sample tap.
Be the concrete structure of degreasing section as shown in Figures 2 to 4, described degreasing section is provided with at least one inert gas pipeline 11, the gas outlet subsection setup of described inert gas pipeline is in degreasing section burner hearth 13, the section of degreasing is simultaneously provided with at least one control carbon gas pipeline 12, and the gas outlet subsection setup of described control carbon gas pipeline is in degreasing section burner hearth 13.Inert gas pipeline 11 and control carbon gas pipeline 12 can arrange a row or multi-row gas outlet vertically.In Fig. 2, inert gas pipeline 11 is provided with three, is respectively the first inert gas pipeline 110, the second inert gas pipeline 111, the 3rd inert gas pipeline 112, and it stretches into the length difference of burner hearth 13 inside.Control carbon gas pipeline 12 also can adopt the structure identical with inert gas pipeline 11.The adjusting of control carbon gas flow direction can be controlled carbon gas pipeline 12 by rotation and carries out, control carbon gas pipeline two ends are rotatably connected on tuning movable joint, specifically can adopt thread connection, control carbon gas pipeline is provided with handle, turning handle, gas outlet direction is rotated and is changed with control carbon gas pipeline 12, certainly, in order to realize the adjusting of gas outlet direction of inert gas pipeline 11, it also can adopt tuning movable joint structure.
Described degreasing section is provided with at least two cooling passages 131 that are communicated with flue and body of heater outer air, and this cooling passage is the adjustable passage that can close and regulate throughput.This cooling passage 131 is communicated with degreasing section flue through heat-insulation layer 130.Passage 131 adopts natural ventilation mode.In the time that needs regulate zone temperatures, can realize by the openings of sizes of opening this section upper shed, can cover opening with a rotating baffle plate, flap shutter is adjustable openings of sizes.
Control carbon gas in described control carbon gas pipeline adopts decarburization atmosphere, and this decarburization atmosphere is H
2or H
2o or decomposed ammonia body or CO
2or O
2also or the combination of above-mentioned gas.
Described degreasing section front end below arranges long-pending wax tank 14, and described long-pending wax tank is provided with grafting wax mouth 140, inert gas entrance 141 and exhaust-valve 142.
Be illustrated in figure 5 the concrete structure of slow cooling section, described slow cooling section 3 arranges air-cooled jacket structured, be set to jacket pipe structure by slow cooling section, outer tube sleeve on inner pipe, between outer tube and inner tube, have certain space to form air-cooled chuck inner chamber 30, described air-cooled chuck inner chamber 30 is inwardly dried by an air blast 31.
Be cooling section concrete structure as shown in Figure 6 to 8, described cooling section arranges a liftable separated door 40 cooling section is separated, described cooling section in liftable separated door front side and rear side be respectively equipped with admission line 41, the admission line of described separated door front side is used for carrying reducibility gas, and the admission line of described separated door rear side is used for carrying inert gas.
Wherein, described admission line 41 comprises that one extends transversely into the gas distribution pipe 411 of cooling section, and these gas distribution pipe two ends are slip-knot 413, and gas distribution pipe is provided with several gas outlets 412.Slip-knot and gas distribution pipe adopt spiral marking connection, in the time that needs are adjusted airflow direction, realize by rotating gas distribution pipe angle.
As shown in Figure 9 and Figure 10, describe as an example of the temperature alarming device in degreasing section example, heat-insulation layer 130 outside degreasing section burner hearth 13 is provided with a main temperature thermocouple 51 and a tracking and temperature testing thermocouple 50, described main temperature thermocouple and and tracking and temperature testing thermocouple be connected with switch board 5, switch board is provided with a tracking overtemperature alarm 52.The data that switch board 5 internal controller record according to main temperature thermocouple 51 and a tracking and temperature testing thermocouple 50 judge whether overtemperature, if overtemperature is controlled and followed the tracks of overtemperature alarm 52 and report to the police.
Temperature alarming device on sintering stage is identical with the temperature alarming device structure in above-mentioned degreasing section.
In addition, the heater of described degreasing section and sintering stage adopts silicon carbide heater, and described sintering furnace arranges sintered dimensions image acquistion system at degreasing section, sintering stage.This system has photoelectric coupling mechanism, has optical system, signal processing system, sintering shrinkage curve setting program and pushes away the compositions such as boat time setting program.
Slow cooling section is provided with protective gas admission line 32, and as the use that passes into sintering gas shield gas, slow cooling section arranges thermocouple temperature measuring apparatus, for monitoring the temperature of slow cooling section, is convenient to adjust in time cooling velocity, reduces deformation of products.
Beneficial effect of the present invention is:
1, set up inert gas pipeline in the segmentation of degreasing section, pipeline can carry out flow and airflow direction adjusting at different warm areas as required;
2, for avoiding the uniformity in airflow influence temperature field, establish cooling passage in degreasing section flue outside, avoid burner hearth internal temperature uncontrollable;
3, in degreasing section, control carbon gas pipeline is set, control carbon gas can be adjusted at different sections as required, and after control carbon gas enters burner hearth inside, airflow direction is adjustable;
4, control carbon gas adopts decarburization atmosphere, and these atmosphere comprise H
2, H
2o, decomposed ammonia body, CO
2, O
2and their combination, to adapt to control carbon needs.Containing O
2mist gas ratio is controlled at non-explosive range.
5,, for guaranteeing size uniform, adopt meshbeltfurnace, stepping beam type continuous oven; While pushing away boat structure sintering furnace, material boat size and fire box temperature are integral multiple relation.
6, in slow cooling section, (sintering stage and cooling section) air inlet arranges temperature control means, controls cooling velocity, reduces deformation of products;
7, at cooling section, separated door is set, separated door leading portion configuration reducibility gas pipeline, the current potential when ensureing that product is cooling;
8,, for guaranteeing to separate sneaking into of oxidizing gas when door opened, inert gas seal measure is set, oxidation while causing that to avoid oxidizing atmosphere to enter separated door leading portion product is cooling separating fire door back segment.
9,, for avoiding the inhomogeneous deformation of products that causes in temperature field of product degreasing and sintering process, preferably high-quality Temperature Control Measures, in control accuracy section temperature difference ± 5 of temperature DEG C.These measures comprise that high-quality carborundum heater, symmetrically arranged TEMP detect tracking measure;
10, controlled for effectively realizing sintering process size, at degreasing section, sintering stage, sintered dimensions image acquistion system is set, from motion tracking product sintered dimensions situation of change, to adjust degreasing, sintering process system;
11,, for avoiding burner to amass wax, long-pending wax tank body is set under burner; On long-pending wax tank body, inert gas pipeline is set, to ensure that de-waxing process does not need blowing out operation, nonoxidizing gas destroys system balancing;
12, be implementation procedure continuous production, adopt external cycling mechanism, guarantee the operation of system continuous circulation.
13, at the follow-up sample tap that arranges of degreasing section, be convenient to sample analysis skimming processes situation and adjust.
The present invention is applicable to the continuous degreasing sintering of cerul, plasticity system, and it is controlled that sintering process can realize carbon, and atmosphere is controlled, temperature is controlled, and product size is controlled, and Product Precision is high, can match in excellence or beauty with vacuum drying oven sintered products.
Claims (7)
1. a metal injection molded continuous sintering furnace degreasing segment structure, it is characterized in that: degreasing section is provided with at least one inert gas pipeline, the gas outlet subsection setup of described inert gas pipeline is in degreasing section burner hearth, the section of degreasing is simultaneously provided with at least one control carbon gas pipeline, the gas outlet subsection setup of described control carbon gas pipeline is in degreasing section burner hearth, described inert gas pipeline enters burner hearth from degreasing section left end, described control carbon gas pipeline enters burner hearth from degreasing section right-hand member, described inert gas pipeline and control carbon gas pipeline are provided with flow control valve, inert gas pipeline is provided with three, be respectively the first inert gas pipeline, the second inert gas pipeline, the 3rd inert gas pipeline, it stretches into the length difference of burner hearth inside, control carbon gas pipeline also adopts the structure identical with inert gas pipeline, control carbon gas pipeline two ends are rotatably connected on tuning movable joint, the adjusting of control carbon gas flow direction is controlled carbon gas pipeline by rotation and is carried out, described degreasing section is provided with at least two cooling passages that are communicated with flue and body of heater outer air, this cooling passage is the adjustable passage that can close and regulate throughput, this cooling passage is communicated with degreasing section flue through heat-insulation layer, passage adopts natural ventilation mode, in the time that needs regulate zone temperatures, realize by the openings of sizes of opening this section upper shed.
2. continuous sintering furnace degreasing segment structure according to claim 1, is characterized in that: the control carbon gas in described control carbon gas pipeline adopts decarburization atmosphere, and this decarburization atmosphere is H
2or H
2o or decomposed ammonia body or CO
2or O
2also or the combination of above-mentioned gas.
3. continuous sintering furnace degreasing segment structure according to claim 1, is characterized in that: described degreasing section below arranges long-pending wax tank, and described long-pending wax tank is provided with grafting wax mouth, inert gas entrance and exhaust-valve.
4. continuous sintering furnace degreasing segment structure according to claim 1, is characterized in that: described degreasing section is provided with sintered dimensions image acquistion system.
5. continuous sintering furnace degreasing segment structure according to claim 1, is characterized in that: described degreasing section adopts silicon carbide heater heating.
6. continuous sintering furnace degreasing segment structure according to claim 1, it is characterized in that: described degreasing section is provided with a main temperature thermocouple and a tracking and temperature testing thermocouple, described main temperature thermocouple and and tracking and temperature testing thermocouple be connected with switch board, switch board is provided with a tracking overtemperature alarm.
7. continuous sintering furnace degreasing segment structure according to claim 1, is characterized in that: the connecting portion of described degreasing section and rear sintering stage is provided with sample tap, and described sample tap adopts upper shed or side opening mode.
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| CN201210491772.0A CN102962458B (en) | 2012-11-27 | 2012-11-27 | Degreasing section structure of metal injection molded continuous sintering furnace |
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| CN102962458B true CN102962458B (en) | 2014-10-08 |
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| CN104325144B (en) * | 2014-10-27 | 2017-01-25 | 福立旺精密机电（中国）股份有限公司 | Metal injecting molding catalytic debinding method and catalytic debinding furnace |
| CN105950938B (en) * | 2016-05-30 | 2017-11-24 | 马鞍山市恒利达机械刀片有限公司 | A kind of processing method of high-performance carbide new material slitting carving knife |
| CN110125393B (en) * | 2019-07-03 | 2024-05-14 | 宁波恒普技术股份有限公司 | Transverse transmission device of continuous degreasing sintering furnace |
| CN110919008A (en) * | 2019-11-22 | 2020-03-27 | 东莞市豪准金属制品有限公司 | Metal injection molding process |
| CN115070033B (en) * | 2022-05-11 | 2024-04-09 | 廖文权 | Continuous degreasing sintering furnace for metal powder |
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| JPH0456707A (en) * | 1990-06-26 | 1992-02-24 | Daido Steel Co Ltd | Continuous type vacuum furnace |
| CN2424433Y (en) * | 2000-05-14 | 2001-03-21 | 陈强 | High vacuum fritting furnace |
| JP2003328006A (en) * | 2002-05-13 | 2003-11-19 | Ishikawajima Harima Heavy Ind Co Ltd | Continuous baking unit for porous body sheet of heat- resistant alloy, and method for manufacturing the same |
| CN203044897U (en) * | 2012-11-27 | 2013-07-10 | 浙江一火科技有限公司 | Degreasing section structure of continuous sintering furnace for metal injection molding |
-
2012
- 2012-11-27 CN CN201210491772.0A patent/CN102962458B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0456707A (en) * | 1990-06-26 | 1992-02-24 | Daido Steel Co Ltd | Continuous type vacuum furnace |
| CN2424433Y (en) * | 2000-05-14 | 2001-03-21 | 陈强 | High vacuum fritting furnace |
| JP2003328006A (en) * | 2002-05-13 | 2003-11-19 | Ishikawajima Harima Heavy Ind Co Ltd | Continuous baking unit for porous body sheet of heat- resistant alloy, and method for manufacturing the same |
| CN203044897U (en) * | 2012-11-27 | 2013-07-10 | 浙江一火科技有限公司 | Degreasing section structure of continuous sintering furnace for metal injection molding |
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Address after: 321001 Zhejiang Province, Jinhua city Wucheng District Youth Industrial Zone Patentee after: Zhejiang fire Polytron Technologies Inc Address before: 321001 Zhejiang Province, Jinhua city Wucheng District Youth Industrial Zone Patentee before: Zhejiang Yihuo Technology Co., Ltd. |
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