CN105290392B - A kind of 304L stainless steel metals powder injection forming method - Google Patents
A kind of 304L stainless steel metals powder injection forming method Download PDFInfo
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- CN105290392B CN105290392B CN201510897221.8A CN201510897221A CN105290392B CN 105290392 B CN105290392 B CN 105290392B CN 201510897221 A CN201510897221 A CN 201510897221A CN 105290392 B CN105290392 B CN 105290392B
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Abstract
The invention discloses a kind of 304L stainless steel metals powder injection forming method, including 304L powder of stainless steel and binding agent kneaded feeding, injection moulding is made prepares blank, burn and force in catalysis degreasing and negative pressure degreasing, vacuum the three-stage atmosphere technique of cooling the step such as to sinter.304L stainless steel parts dimensional accuracy that the present invention is obtained is high, surface accuracy is high, impulse- free robustness phenomenon, and present invention, avoiding solvent degreasing and the complicated technology of thermal debinding, production efficiency is high, production cost is low.
Description
Technical field
The present invention relates to Metal Injection Molding field, and in particular to a kind of 304L stainless steel metals powder injection forming
Method.
Background technology
Metal powder injection molded (Metal Injection Molding, MIM) is by metal dust and its binding agent
Plasticising compound is injected in the manufacturing process in model.It is on the basis of conventional powder metallurgy, creatively to combine
The injection molding technology of plastics industry and the emerging forming technique grown up.It is sufficiently complex that MIM can produce shape
Part, the part of net shape can be made to greatest extent and subsequently need not machine or need to only use minimal amount of machining, fit
Close and produce in enormous quantities, production efficiency is high.
Powder injection forming stainless steel has good corrosion resistance, is widely used in machinery, chemical industry, ship, automobile, instrument
The industries such as instrument.Patent 201110164890.6 discloses a kind of disposable forming technology of light communicating component seat, describes 304 not
The injection molding process of rust steel, but solvent degreasing and thermal debinding are used, its skimming processes is more complicated, and degreasing speed is slow,
Skimmed prod is also easy to produce defect, deformation, and the dimensional accuracy and surface accuracy of product are not ideal enough.
The content of the invention
In view of this, can it is an object of the invention to provide a kind of 304L stainless steel metals powder injection forming method
The 304L stainless steel parts of higher dimensional precision and surface accuracy are obtained, without follow-up machining, and production cost is low.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of 304L stainless steel metals powder injection forming method, comprises the following steps：
(1) pelletized after being kneaded 304L powder of stainless steel and binding agent on comminutor, feeding is made；
(2) feeding for obtaining step (1) adds injection moulding in injection machine, prepares blank；
(3) blank for obtaining step (2), which is placed in catalysis degreasing stove, makees catalyst with nitric acid gas and carries out catalysis degreasing,
Nitric acid gas is passed through speed for 1.6~2.5L/h, and nitrogen is passed through speed for 2~2.5L/h, and skimming temp is 100~130 DEG C, is taken off
The fat time is 3~6h, obtains degreasing base；
(4) the degreasing base for obtaining step (3), which is placed in vacuum sintering furnace, carries out atmosphere technique sintering, the atmosphere technique
Sintering is divided into negative pressure degreasing, the interior burning of vacuum and forces cooling three phases；The technological parameter in negative pressure degreasing stage is：Vacuum
Vacuum values are 2.7 × 10 in sintering furnace3~4.3 × 103Pa, is passed through the nitrogen that flow is 25~35L/h, with 2~6 DEG C/min's
Heating rate is warming up to 1000~1100 DEG C, is incubated 90~120min；The technological parameter in burning stage is in vacuum：Vacuum sintering furnace
Interior vacuum values are 0.92~4.1Pa, are passed through the argon gas that flow is 20~28L/h, are warming up to 5~10 DEG C/min heating rates
1350~1370 DEG C, it is incubated 120~240min；Force cooling stage technological parameter be：It is passed through the argon that flow is 20~28L/h
Gas, room temperature is cooled to 3~5 DEG C/min rate of temperature fall；304L stainless steel parts are made.
As the preferred technical solution of the present invention, in the step (1), the component and percentage by weight of binding agent are：It is poly-
Formaldehyde 86%~91%, high density polyethylene (HDPE) 4%~8%, polypropylene 2%~5%, paraffin 3%~5%.
As the preferred technical solution of the present invention, in the step (1), the particle mean size of 304L powder of stainless steel for 9~
11μm。
As the preferred technical solution of the present invention, in the step (1), the volume ratio of 304L powder of stainless steel and binding agent
For 1: 2~1: 4.
As the preferred technical solution of the present invention, in the step (1), melting temperature is 165~195 DEG C, mixing time
For 1.5~2h.
As the preferred technical solution of the present invention, in the step (2), injection temperature is 160~190 DEG C, injection pressure
For 60~127MPa, mould temperature is 112~125 DEG C.
As the preferred technical solution of the present invention, in the step (3), the degreasing rate of degreasing base is 7.2%~7.3%.
The beneficial effects of the present invention are：
The blank of 304L powder of stainless steel and binding agent injection moulding is first made catalyst with nitric acid gas and carried out by the present invention
Catalysis degreasing, then the atmosphere technique sintering of three-stage is carried out, the 304L stainless steel parts dimensional accuracy finally obtained is high, surface essence
Degree is high, impulse- free robustness phenomenon, and present invention, avoiding solvent degreasing and the complicated technology of thermal debinding, production efficiency is high, be produced into
This is low.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carried out
Explanation：
Fig. 1 is the process chart of the 304L stainless steel metal powder injection forming methods of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
304L is low carbon stainless steel material, and the 304L powder of stainless steel that following examples are used is by the sharp moral powder material in Shijiazhuang
Expect Co., Ltd's production, the particle mean size of 304L powder of stainless steel is 9~11 μm.
Embodiment 1
The 304L stainless steel metal powder injection forming methods of embodiment 1, comprise the following steps：
(1) binding agent is prepared according to following percentage by weight：Polyformaldehyde 86%, high density polyethylene (HDPE) 8%, polypropylene 2%,
Paraffin 4%；304L powder of stainless steel and binding agent are kneaded according to 1: 2 volume ratio, melting temperature is 170 DEG C, mixing
Time is 1.5h, is then pelletized on comminutor, feeding is made；
(2) feeding for obtaining step (1) adds injection moulding in injection machine, and injection temperature is 160 DEG C, injection pressure
Power is 70MPa, and mould temperature is 120 DEG C, prepares blank；
(3) blank for obtaining step (2), which is placed in catalysis degreasing stove, makees catalyst with nitric acid gas and carries out catalysis degreasing,
Nitric acid gas is passed through speed for 1.6L/h, and nitrogen is passed through speed for 2L/h, and skimming temp is 100 DEG C, and degreasing time is 6h, is obtained
Degreasing base, the degreasing rate of degreasing base is 7.2%；
(4) the degreasing base for obtaining step (3), which is placed in vacuum sintering furnace, carries out atmosphere technique sintering, the atmosphere technique
Sintering is divided into negative pressure degreasing, the interior burning of vacuum and forces cooling three phases；The technological parameter in negative pressure degreasing stage is：Vacuum
Vacuum values are 3.0 × 10 in sintering furnace3Pa, is passed through the nitrogen that flow is 25L/h, is warming up to 2 DEG C/min heating rate
1000 DEG C, it is incubated 120min；The technological parameter in burning stage is in vacuum：Vacuum values are 0.95Pa in vacuum sintering furnace, are passed through stream
The argon gas for 20L/h is measured, 1350 DEG C are warming up to 5 DEG C/min heating rates, 240min is incubated；Force the technique ginseng of cooling stage
Number is：The argon gas that flow is 20L/h is passed through, room temperature is cooled to 3 DEG C/min rate of temperature fall；304L stainless steel parts are made.
Embodiment 2
The 304L stainless steel metal powder injection forming methods of embodiment 2, comprise the following steps：
(1) binding agent is prepared according to following percentage by weight：Polyformaldehyde 89%, high density polyethylene (HDPE) 5%, polypropylene 2%,
Paraffin 4%；304L powder of stainless steel and binding agent are kneaded according to 1: 3 volume ratio, melting temperature is 180 DEG C, mixing
Time is 1.8h, is then pelletized on comminutor, feeding is made；
(2) feeding for obtaining step (1) adds injection moulding in injection machine, and injection temperature is 180 DEG C, injection pressure
Power is 100MPa, and mould temperature is 120 DEG C, prepares blank；
(3) blank for obtaining step (2), which is placed in catalysis degreasing stove, makees catalyst with nitric acid gas and carries out catalysis degreasing,
Nitric acid gas is passed through speed for 2L/h, and nitrogen is passed through speed for 2.3L/h, and skimming temp is 120 DEG C, and degreasing time is 4h, is obtained
Degreasing base, the degreasing rate of degreasing base is 7.3%；
(4) the degreasing base for obtaining step (3), which is placed in vacuum sintering furnace, carries out atmosphere technique sintering, the atmosphere technique
Sintering is divided into negative pressure degreasing, the interior burning of vacuum and forces cooling three phases；The technological parameter in negative pressure degreasing stage is：Vacuum
Vacuum values are 3.5 × 10 in sintering furnace3Pa, is passed through the nitrogen that flow is 30L/h, is warming up to 4 DEG C/min heating rate
1100 DEG C, it is incubated 100min；The technological parameter in burning stage is in vacuum：Vacuum values are 2.0Pa in vacuum sintering furnace, are passed through flow
For 25L/h argon gas, 1360 DEG C are warming up to 8 DEG C/min heating rates, 200min is incubated；Force the technological parameter of cooling stage
For：The argon gas that flow is 25L/h is passed through, room temperature is cooled to 4 DEG C/min rate of temperature fall；304L stainless steel parts are made.
Embodiment 3
The 304L stainless steel metal powder injection forming methods of embodiment 3, comprise the following steps：
(1) binding agent is prepared according to following percentage by weight：Polyformaldehyde 91%, high density polyethylene (HDPE) 4%, polypropylene 2%,
Paraffin 3%；304L powder of stainless steel and binding agent are kneaded according to 1: 4 volume ratio, melting temperature is 195 DEG C, mixing
Time is 1.5h, is then pelletized on comminutor, feeding is made；
(2) feeding for obtaining step (1) adds injection moulding in injection machine, and injection temperature is 190 DEG C, injection pressure
Power is 120MPa, and mould temperature is 125 DEG C, prepares blank；
(3) blank for obtaining step (2), which is placed in catalysis degreasing stove, makees catalyst with nitric acid gas and carries out catalysis degreasing,
Nitric acid gas is passed through speed for 2.5L/h, and nitrogen is passed through speed for 2.5L/h, and skimming temp is 130 DEG C, and degreasing time is 3h, is obtained
To degreasing base, the degreasing rate of degreasing base is 7.2%；
(4) the degreasing base for obtaining step (3), which is placed in vacuum sintering furnace, carries out atmosphere technique sintering, the atmosphere technique
Sintering is divided into negative pressure degreasing, the interior burning of vacuum and forces cooling three phases；The technological parameter in negative pressure degreasing stage is：Vacuum
Vacuum values are 4.2 × 10 in sintering furnace3Pa, is passed through the nitrogen that flow is 35L/h, is warming up to 6 DEG C/min heating rate
1100 DEG C, it is incubated 90min；The technological parameter in burning stage is in vacuum：Vacuum values are 4.1Pa in vacuum sintering furnace, are passed through flow
For 28L/h argon gas, 1370 DEG C are warming up to 10 DEG C/min heating rates, 120min is incubated；Force the technique ginseng of cooling stage
Number is：The argon gas that flow is 28L/h is passed through, room temperature is cooled to 5 DEG C/min rate of temperature fall；304L stainless steel parts are made.
304L stainless steel parts dimensional accuracy made from embodiment 1-3 is high, surface accuracy is high, impulse- free robustness phenomenon, specific inspection
Survey result as follows：
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (5)
1. a kind of 304L stainless steel metals powder injection forming method, it is characterised in that：Comprise the following steps：
（1）Pelletized after 304L powder of stainless steel and binding agent are kneaded on comminutor, feeding is made；The 304L is stainless
Powdered steel and the volume ratio of binding agent are 1：2~1：4, the component and percentage by weight of the binding agent are：Polyformaldehyde 86% ~ 91%,
High density polyethylene (HDPE) 4% ~ 8%, polypropylene 2% ~ 5%, paraffin 3% ~ 5%；
（2）By step（1）Obtained feeding adds injection moulding in injection machine, prepares blank；
（3）By step（2）Obtained blank, which is placed in catalysis degreasing stove, to be made catalyst with nitric acid gas and carries out catalysis degreasing, nitric acid
Gas is passed through speed for 1.6 ~ 2.5L/h, and nitrogen is passed through speed for 2 ~ 2.5L/h, and skimming temp is 100 ~ 130 DEG C, degreasing time
For 3 ~ 6h, degreasing base is obtained；
（4）By step（3）Obtained degreasing base, which is placed in vacuum sintering furnace, carries out atmosphere technique sintering, the atmosphere technique sintering
It is divided into negative pressure degreasing, the interior burning of vacuum and forces cooling three phases；The technological parameter in negative pressure degreasing stage is：Vacuum-sintering
Vacuum values are 2.7 × 10 in stove3~4.3×103Pa, is passed through the nitrogen that flow is 25 ~ 35L/h, with 2 ~ 6 DEG C/min heating rate
1000 ~ 1100 DEG C are warming up to, 90 ~ 120min is incubated；The technological parameter in burning stage is in vacuum：Vacuum values are in vacuum sintering furnace
0.92 ~ 4.1Pa, is passed through the argon gas that flow is 20 ~ 28L/h, and 1350 ~ 1370 DEG C, guarantor are warming up to 5 ~ 10 DEG C/min heating rates
120 ~ 240min of temperature；Force cooling stage technological parameter be：The argon gas that flow is 20 ~ 28L/h is passed through, with 3 ~ 5 DEG C/min's
Rate of temperature fall is cooled to room temperature；304L stainless steel parts are made.
2. 304L stainless steel metals powder injection forming method according to claim 1, it is characterised in that：The step
（1）In, the particle mean size of 304L powder of stainless steel is 9 ~ 11 μm.
3. 304L stainless steel metals powder injection forming method according to claim 1, it is characterised in that：The step
（1）In, melting temperature is 165 ~ 195 DEG C, and mixing time is 1.5 ~ 2h.
4. 304L stainless steel metals powder injection forming method according to claim 1, it is characterised in that：The step
（2）In, injection temperature is 160 ~ 190 DEG C, and injection pressure is 60 ~ 127MPa, and mould temperature is 112 ~ 125 DEG C.
5. 304L stainless steel metals powder injection forming method according to claim 1, it is characterised in that：The step
（3）In, the degreasing rate of degreasing base is 7.2% ~ 7.3%.
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