CN103317138B - Metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique - Google Patents
Metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique Download PDFInfo
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- CN103317138B CN103317138B CN201310227232.6A CN201310227232A CN103317138B CN 103317138 B CN103317138 B CN 103317138B CN 201310227232 A CN201310227232 A CN 201310227232A CN 103317138 B CN103317138 B CN 103317138B
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Abstract
The present invention relates to metal powder injection molding vacuum degreasing fritting furnace, disclose a kind of metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique, comprise defatting step and cleaning step, wherein cleaning step comprises repetition second valve closing, the first valve open inflation and the first valve closing, the second valve open step of bleeding to control the pressure of furnace interior.The present invention increases cleaning step in degreasing process, protective gas can be realized and be repeatedly full of hopper and part, the gaseous state binding agent that hopper is inner and inside parts is residual is eliminated gradually, avoid binding agent affect in the cracking of sintering process stage part sinter after performance; Control, promote density and control chemical composition at accessory size as helpful in the carbon content control in stainless steel etc.
Description
Technical field
The present invention relates to metal powder injection molding vacuum degreasing fritting furnace, particularly relate to a kind of metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique.
Background technology
Metal current powder injection-molded vacuum degreasing fritting furnace furnace interior primary structure is except calandria and heat-insulation layer, also be provided with an airtight hopper, hopper is provided with safety valve, and hopper inside communicates with degreasing pipeline, and furnace interior communicates with the gas ducting be arranged on body of heater.In skimming processes, calandria heats, and vavuum pump is constantly bled by degreasing pipeline, and gas ducting is constantly filled with protective gas, makes hopper inside and outside formation pressure reduction, impels gas unidirectional to flow.Along with the rising of skimming temp, binding agent changes into gaseous state, arrives piece surface by spreading and penetrating through pore.Uniform air flow energy removes most of binding agent, but still has a small amount of binding agent to stay some position in inside parts or hopper.There is no cleaning step in original degreasing process, cannot thoroughly remove residual binding agent, can carbon be cracked in the sintering process stage, thus performance after affecting part sintering.
Summary of the invention
The present invention is directed to and cannot thoroughly remove residual binding agent in prior art and affect the shortcoming that part sinters rear performance, provide and a kind ofly improve the density after part sintering, thus obtain the metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique of good performance.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
Metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique, the first valve is arranged on gas ducting, and the second valve is arranged on degreasing pipeline, comprises the following steps:
A. standard defatting step;
Step one: the calandria heating of furnace interior, vavuum pump is constantly bled to hopper inside, protective gas constantly enters furnace interior by gas ducting, and enter hopper inside by crack between a door and its frame and safety valve, discharged by degreasing pipeline again, binding agent is collected by the trap be arranged on degreasing pipeline, and hopper inside and outside differential pressure is in poised state;
Step 2: calandria continuous heating, binding agent is converted into gaseous state binding agent, and protective gas and part gaseous state binding agent form mist, and mist is discharged by degreasing pipeline again;
B. cleaning step;
Step 3: after standard degreasing process completes, now furnace interior is still in heated condition, vavuum pump is also in running status, and hopper inside and inside parts still have a small amount of gaseous state binding agent not to be pulled away, and now part external pressure P is equal with inside parts pressure P 0, close the second valve, open the first valve, vavuum pump work but not to hopper internal air exhausting, protective gas is still maintained by gas ducting and enters furnace interior, pressure reduction now inside and outside hopper increases, protective gas accelerates to enter hopper, enter the gaseous state binding agent that hopper afterflush is residual, and be mixed to form mist with gaseous state binding agent, instantaneous part external pressure P ' is greater than inside parts pressure P 0 ', because the pressure reduction inside and outside part increases, partial protection gas penetrates into inside parts and the gaseous state binding agent residual with inside parts is mixed to form mist,
Step 4: after the pressure of furnace interior reaches setting value, this setting value is P2, and part external pressure and inside parts pressure also reach balance; Close the first valve, open the second valve, vavuum pump is to hopper internal air exhausting, the mist of hopper inside is discharged by degreasing pipeline, instantaneous part external pressure P " be less than inside parts pressure P 0 ", now the mist of inside parts is to external diffusion, and is together pulled away along with the mist of the air pump hopper inside of vavuum pump; After the pressure of furnace interior reaches setting value, this setting value is P1, and part external and internal pressure reaches balance again;
As preferably, repeat step 3 and step 4, the time of repetition, the gaseous state binding agent that repeatedly, the inner each corner of hopper and inside parts remain was eliminated gradually between 0.5 ~ 3h.
As preferably, the setting range of P1 is: 1 ~ 30KPa.
As preferably, the setting range of P2 is: 11 ~ 80KPa.
As preferably, wherein P2-P1 >=10KPa.
As preferably, the pressure rise curve slope of furnace interior and decline curve slope are by the first valve and the second valve regulated.
The present invention increases cleaning step in degreasing process, changed up and down by the instantaneous of furnace interior pressure, also pressure reduction variation can certainly will be formed inside and outside hopper and inside and outside part, thus the residual gaseous state binding agent protected property gas continuous " flushing " realizing hopper each position inner and inside parts is taken away, until make the gaseous state binding agent that hopper is inner and inside parts is residual thoroughly be taken away, avoid binding agent affect in the cracking of sintering process stage part sinter after performance; Control, promote density and control chemical composition at accessory size as helpful in the carbon content control in stainless steel etc.
Accompanying drawing explanation
Fig. 1 is gas extraction system schematic diagram of the present invention.
Fig. 2 is schematic diagram when part external pressure P is equal with inside parts pressure P 0 after standard degreasing process completes.
Fig. 3 is the schematic diagram that the instantaneous part external pressure P ' of step 3 is greater than inside parts pressure P 0 '.
Fig. 4 is the schematic diagram that step 4 part external pressure and inside parts pressure reach poised state.
Fig. 5 is the instantaneous part external pressure P of step 4 " be less than inside parts pressure P 0 " schematic diagram.
Fig. 6 is furnace interior pressure curve map over time.
The toponym that in accompanying drawing, each number designation refers to is as follows: wherein 1-gas ducting, the 2-the first valve, 3-body of heater, 4-hopper, 5-pressure sensor, 6-degreasing pipeline, the 7-the second valve, 8-vavuum pump, 9-trap, 10-gaseous state binding agent, 11-mist, 12-calandria.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Embodiment 1
Metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique, as shown in Figure 1, it is inner that part is arranged on hopper 4, wherein gas ducting 1 one end communicates with body of heater 3 inside, and degreasing pipeline 6 one end communicates with hopper 4 inside, and degreasing pipeline 6 other end communicates with vavuum pump 8, it is inner that calandria 12 is arranged on body of heater 3, trap 9 is arranged on degreasing pipeline 6, and the first valve 2 is arranged on gas ducting 1, and the second valve 7 is arranged on degreasing pipeline 6.
Cleaning by degreasing technique comprises the following steps:
A. standard defatting step;
Step one: the calandria 12 of body of heater 3 inside heats, constantly bleed in vavuum pump 8 pairs of hopper 4 inside, it is inner that protective gas constantly enters body of heater 3 by gas ducting 1, and it is inner to enter hopper 4 by crack between a door and its frame and safety valve, discharged by degreasing pipeline 6 again, binding agent is collected by the trap 9 be arranged on degreasing pipeline 6, and hopper 4 inside and outside differential pressure is in poised state;
Step 2: calandria 12 continuous heating, binding agent is converted into gaseous state binding agent 10, and protective gas and part gaseous state binding agent 10 are mixed to form mist 11, and mist 11 is discharged by degreasing pipeline 6 again;
B. cleaning step;
As shown in Figure 2, step 3: after standard degreasing process completes, now body of heater 3 inside is still in heated condition, vavuum pump 8 is also in running status, hopper 4 inside and inside parts still have a small amount of gaseous state binding agent 10 not to be pulled away, now part external pressure P is equal with inside parts pressure P 0, i.e. P=P0, close the second valve 7, open the first valve 2, vavuum pump 8 works but not to hopper 4 internal air exhausting, protective gas is still maintained by gas ducting 1 and enters body of heater 3 inside, pressure reduction now inside and outside hopper 4 increases, protective gas accelerates to enter hopper 4, enter the gaseous state binding agent 10 that hopper 4 afterflush is residual, and be mixed to form mist 11 with gaseous state binding agent 10, instantaneous part external pressure P ' is greater than inside parts pressure P 0 ', i.e. P ' >P0 ', as shown in Figure 3, because the pressure reduction inside and outside part increases, partial protection gas penetrates into inside parts and the gaseous state binding agent 10 residual with inside parts is mixed to form mist 11,
Step 4: after the pressure of body of heater 3 inside reaches setting value, this setting value is P2, and as shown in Figure 4, part external pressure and inside parts pressure also reach balance; Close the first valve 2, open the second valve 7, vavuum pump 8 pairs of hopper 4 internal air exhaustings, the mist 11 of hopper 4 inside is discharged by degreasing pipeline 6, as shown in Figure 5, instantaneous part external pressure P " be less than inside parts pressure P 0 ", i.e. P " <P0 ", now the mist 11 of inside parts is to external diffusion, and is together pulled away along with the mist 11 of air pump hopper 4 inside of vavuum pump 8; After the pressure of body of heater 3 inside reaches setting value, this setting value is P1, and part external and internal pressure reaches balance again;
Repeat step 3 and step 4, the time of repetition, the gaseous state binding agent 10 that repeatedly, the inner each corner of hopper 4 and inside parts remain was eliminated gradually between 0.5 ~ 3h.
The pressure rise curve slope of body of heater 3 inside and decline curve slope regulate by the first valve 2 and the second valve 7.In the present embodiment, the first valve 2 is mass flow controller, and the second valve 7 is proportion adjustment valve.The pressure of body of heater 3 inside gathers reading by pressure sensor 5, and the information collected is delivered to controller by pressure sensor 5, and is judged by controller, and then the opening and closing of by-pass valve control.
Arrow in Fig. 1 and Fig. 3 is the flow direction of protective gas.Arrow in Fig. 5 is the flow direction of mist.
As shown in Figure 6, the pressure P of body of heater 3 inside fluctuates along with the change of time T, and its change curve is zigzag.
The setting range of P1 is: 1 ~ 30KPa.
The setting range of P2 is: 11 ~ 80kPa.
Wherein P2-P1 >=10KPa.The value of P1 and P2 all can artificially set.
Table 1 is that scavenging period and set P1, P2 affect situation to density after stainless steel 17-4ph part sintering.
| Sequence number | T/h | P1/KPa | P2/KPa | Density (g/cm -3) |
| 1 | 0.5 | 1 | 11 | 7.61 |
| 2 | 0.5 | 10 | 35 | 7.61 |
| 3 | 0.5 | 20 | 55 | 7.67 |
| 4 | 0.5 | 30 | 80 | 7.68 |
| 5 | 1 | 1 | 11 | 7.61 |
| 6 | 1 | 10 | 35 | 7.62 |
| 7 | 1 | 20 | 55 | 7.67 |
| 8 | 1 | 30 | 80 | 7.69 |
| 9 | 2 | 1 | 11 | 7.62 |
| 10 | 2 | 10 | 35 | 7.64 |
| 11 | 2 | 20 | 55 | 7.69 |
| 12 | 2 | 30 | 80 | 7.70 |
| 13 | 3 | 1 | 11 | 7.62 |
| 14 | 3 | 10 | 35 | 7.65 |
| 15 | 3 | 20 | 55 | 7.69 |
| 16 | 3 | 30 | 80 | 7.71 |
In existing technology, do not have cleaning step in degreasing process, the density after part sintering is generally at 7.5-7.6g/cm
-3between, as can be seen from Table 1, adopt cleaning step of the present invention, under the condition increasing cleaning step time and raising P2 and P1 difference, effectively can remove binding agent, improve the density after part sintering, thus obtain good performance.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (6)
1. metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique, it is characterized in that, first valve (2) is arranged on gas ducting (1), and the second valve (7) is arranged on degreasing pipeline (6), comprises the following steps:
A. standard defatting step:
Step one: calandria (12) heating that body of heater (3) is inner, vavuum pump (8) is constantly bled to hopper (4) inside, it is inner that protective gas constantly enters body of heater (3) by gas ducting (1), and it is inner to enter hopper (4) by crack between a door and its frame and safety valve, discharged by degreasing pipeline (6) again, binding agent is collected by the trap (9) be arranged on degreasing pipeline (6), and hopper (4) inside and outside differential pressure is in poised state;
Step 2: calandria (12) continuous heating, binding agent is converted into gaseous state binding agent (10), protective gas and part gaseous state binding agent (10) are mixed to form mist (11), and mist (11) is discharged by degreasing pipeline (6) again;
B. cleaning step:
Step 3: after standard degreasing process completes, now body of heater (3) inside is still in heated condition, vavuum pump (8) is also in running status, hopper (4) inside and inside parts still have a small amount of gaseous state binding agent (10) not to be pulled away, and now part external pressure P is equal with inside parts pressure P 0, close the second valve (7), open the first valve (2), vavuum pump (8) work but not to hopper (4) internal air exhausting, protective gas is still maintained by gas ducting (1) and enters body of heater (3) inside, pressure reduction now inside and outside hopper (4) increases, protective gas accelerates to enter hopper (4), enter the gaseous state binding agent (10) that hopper (4) afterflush is residual, and be mixed to form mist (11) with gaseous state binding agent (10), instantaneous part external pressure P ' is greater than inside parts pressure P 0 ', because the pressure reduction inside and outside part increases, partial protection gas penetrates into inside parts and the gaseous state binding agent (10) residual with inside parts is mixed to form mist (11),
Step 4: after the pressure that body of heater (3) is inner reaches setting value, this setting value is P2, and part external pressure and inside parts pressure also reach balance; Close the first valve (2), open the second valve (7), vavuum pump (8) is to hopper (4) internal air exhausting, the mist (11) of hopper (4) inside is discharged by degreasing pipeline (6), instantaneous part external pressure P " be less than inside parts pressure P 0 ", now the mist (11) of inside parts is to external diffusion, and is together pulled away along with the mist (11) that the air pump hopper (4) of vavuum pump (8) is inner; After the pressure that body of heater (3) is inner reaches setting value, this setting value is P1, and part external and internal pressure reaches balance again.
2. metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique according to claim 1, it is characterized in that: repeat step 3 and step 4, the time repeated, the gaseous state binding agent (10) that repeatedly, the inner each corner of hopper (4) and inside parts remain was eliminated gradually between 0.5 ~ 3h.
3. metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique according to claim 1, is characterized in that: the setting range of P1 is: 1 ~ 30KPa.
4. metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique according to claim 3, is characterized in that: the setting range of P2 is: 11 ~ 80KPa.
5. metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique according to claim 4, is characterized in that: wherein P2-P1 >=10KPa.
6. metal powder injection molding vacuum degreasing fritting furnace cleaning by degreasing technique according to claim 1, is characterized in that: the pressure rise curve slope in body of heater (3) and decline curve slope regulate by the first valve (2) and the second valve (7).
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| CN106735226B (en) * | 2017-01-20 | 2019-03-19 | 宁波恒普真空技术有限公司 | Multizone control climate metal injection moulding vacuum sintering furnace |
| CN109530685B (en) * | 2018-12-29 | 2021-01-15 | 株洲万融新材科技有限公司 | Vacuum degreasing sintering forming method |
| CN112355304B (en) * | 2020-10-14 | 2022-10-25 | 陕西斯瑞新材料股份有限公司 | Processing technology for preparing CuW60-CuW90 metal section part through injection molding |
| CN112276096A (en) * | 2020-10-16 | 2021-01-29 | 苏州敏发科精密电子科技有限公司 | Cleaning process of metal powder injection molding vacuum degreasing sintering furnace |
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| JPH03191002A (en) * | 1989-12-20 | 1991-08-21 | Sumitomo Heavy Ind Ltd | Method for removing binder and for sintering for metal injection molding product |
| JPH03193802A (en) * | 1989-12-21 | 1991-08-23 | Daido Steel Co Ltd | Method for removing binder using vacuum furnace |
| JPH09145257A (en) * | 1995-11-17 | 1997-06-06 | Shimazu Mekutemu Kk | Vacuum dewaxing-sintering furnace |
| JPH10318676A (en) * | 1997-05-19 | 1998-12-04 | Shimazu Mekutemu Kk | Heat treatment furnace |
| JPH1112604A (en) * | 1997-06-20 | 1999-01-19 | Akio Nishihara | Vacuum heat treatment device |
| TW200938317A (en) * | 2008-03-10 | 2009-09-16 | Shin Zu Shing Co Ltd | Vacuum degreasing and wax-collecting device |
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2013
- 2013-06-06 CN CN201310227232.6A patent/CN103317138B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03191002A (en) * | 1989-12-20 | 1991-08-21 | Sumitomo Heavy Ind Ltd | Method for removing binder and for sintering for metal injection molding product |
| JPH03193802A (en) * | 1989-12-21 | 1991-08-23 | Daido Steel Co Ltd | Method for removing binder using vacuum furnace |
| JPH09145257A (en) * | 1995-11-17 | 1997-06-06 | Shimazu Mekutemu Kk | Vacuum dewaxing-sintering furnace |
| JPH10318676A (en) * | 1997-05-19 | 1998-12-04 | Shimazu Mekutemu Kk | Heat treatment furnace |
| JPH1112604A (en) * | 1997-06-20 | 1999-01-19 | Akio Nishihara | Vacuum heat treatment device |
| TW200938317A (en) * | 2008-03-10 | 2009-09-16 | Shin Zu Shing Co Ltd | Vacuum degreasing and wax-collecting device |
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Address after: No.365, Xinxing 1st Road, Cixi hi tech Industrial Development Zone, Ningbo, Zhejiang, 315300 Patentee after: Ningbo Hengpu Vacuum Technology Co.,Ltd. Address before: 315300 no.488-560, North Youth Palace Road, Gutang street, Cixi City, Ningbo City, Zhejiang Province Patentee before: NINGBO HIPER VACUUM TECHNOLOGY Co.,Ltd. |
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Address after: No. 365, Xinxing 1st Road, Cixi hi tech Industrial Development Zone, Ningbo City, Zhejiang Province, 315300 Patentee after: Ningbo Hengpu Technology Co.,Ltd. Address before: No.365, Xinxing 1st Road, Cixi hi tech Industrial Development Zone, Ningbo, Zhejiang, 315300 Patentee before: Ningbo Hengpu Vacuum Technology Co.,Ltd. |
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