CN108247064A - A kind of new type of injection molding stainless steel parts and preparation method thereof - Google Patents
A kind of new type of injection molding stainless steel parts and preparation method thereof Download PDFInfo
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- CN108247064A CN108247064A CN201711278837.2A CN201711278837A CN108247064A CN 108247064 A CN108247064 A CN 108247064A CN 201711278837 A CN201711278837 A CN 201711278837A CN 108247064 A CN108247064 A CN 108247064A
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- preparation
- stainless steel
- injection molding
- new type
- feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses a kind of preparation methods of new type of injection molding stainless steel parts, include the following steps：1) feeding is prepared：By the metal powder of carbon content≤0.03% and adhesive mixing mixing feeding；2) it is injection moulded；3) degreasing；4) vacuum-sintering；5) 1,040 1070 DEG C are warming up to, is atomized and cooled down using quenching oil, obtain solid solution；6) closed oil repoussage shape；7) in 460 500 DEG C of vacuum agings, new type stainless steel. corrosion resistance is obtained.The hardness for the new type stainless steel. corrosion resistance that the present invention obtains is up to HRC40 48；Dimensional accuracy is 2 2.5 ‰, while has higher toughness；Cost is lower by more than 20% than similary high rigidity and high-precision import stainless steel parts alloy.
Description
Technical field
The present invention relates to powder metallurgical technology more particularly to a kind of new type of injection molding stainless steel parts and its preparations
Method.
Background technology
Powder metallurgical technique is a kind of important component of machine processing technology.The fast development in the fields such as high-tech industry
It is increasing to the demand of large scale high-precision labyrinth powdered metal parts.It, can using powder metallurgy in developed country
Produce simple small size or even complicated large-sized key components and parts.
Although China's Powder Metallurgy Industry has had the developing history of decades, Problems Existing is more：
(1) enterprise is more, small scale, intersects enterprise and demands a lower price dog-eat-dog, deficiency in economic performance；
(2) product specification is low；
(3) auxiliary facility falls behind；The starting stage is especially on complex large-sized critical component is produced.
Powder injection forming (Powder Injection Molding, PIM) is to the chemistry of production stainless steel powder powder stock
Ingredient, size distribution, apparent density, etc. have certain requirement.
At present, also there are a certain distance in this regard for most of domestic powder of stainless steel, are in particular in：Powder
Oxygen content is high, the injection moulding performance of part is uneven, the mechanical property of product and precision is not high and parts batch after sintering
It is poor to measure conformity of production.
The above problem causes China not yet to carry out powder forming technology, mold design and the system of this type component in this field
Technology, the sintering densification technology of powder base are made, therefore market is huge has a extensive future.
Invention content
For overcome the deficiencies in the prior art, one of the objects of the present invention is to provide a kind of high rigidity high-precision high tenacity
New type of injection molding stainless steel parts.
The second object of the present invention is to provide the preparation method of above-mentioned new type of injection molding stainless steel parts.
An object of the present invention adopts the following technical scheme that realization：
A kind of preparation method of new type of injection molding stainless steel parts, includes the following steps：
Prepare feeding step：Metal powder with adhesive in mixer is sufficiently mixed, in 160-200 DEG C of refining, is broken
It pelletizes after broken, obtains feeding；Carbon content≤0.03 of the metal powder；
It is injection moulded step：Mold will be injected in using injection molding machine after feeding melten gel；
Defatting step：At 110-130 DEG C, at 4.5-6 cubic metres per hour, acid intake amount takes off in 3-6g/min nitrogen flow
Fat 7-8 hours；
Vacuum-sintering step：It is warming up to 1300-1320 DEG C of vacuum-sintering；
Solution heat treating step：1040-1070 DEG C is warming up to, is atomized and cooled down using quenching oil, obtain solid solution；
Aligning step：Closed oil repoussage shape；
Ageing stage：In 460-500 DEG C of vacuum aging, new type of injection molding stainless steel parts are obtained.
Further, it prepares in feeding step, the adhesive is made of following components by weight percentage：Copolymerization
Formaldehyde resin 85-94%, EVA 3-5%, PP 1-3%, PE 1-3% and SA stearic acid 1-3%.
Further, it prepares in feeding step, the copper content of the metal powder is 4.0-5.0%.
Further, it is injection moulded in step, the melten gel of 93-96% volumes, pressurize discharge flow liner, mould is injected into mold
Tool is heated to natural cooling after 100-140 DEG C of temperature.
Further, in defatting step, using staged by the way of acid into acid, degreasing 1-2h, acid intake amount 3-4g/
Min, degreasing 3-4h, acid intake amount 5-6g/min, degreasing 5-6h, acid intake amount 3-4g/min.
Further, in solution heat treating step, concrete operations are：1040-1070 DEG C of solid solution is warming up in 2-5h, is protected
Spray quenching oil cooling is filled with after warm 3-5h but, is quickly cooled down to obtain homogeneous solid solution.
Further, in ageing stage, 460-480 DEG C of heat preservation 4-6h is warming up in 0.5-1h and carries out vacuum aging, is filled
Enter nitrogen cooling.
Further, in 1040-1070 DEG C of solid solution, in 480 DEG C of timeliness.
Further, in 1050 DEG C of solid solutions, in 480 DEG C of timeliness.
The second object of the present invention adopts the following technical scheme that realization：
The new type of injection molding stainless steel parts that a kind of preparation method as described above obtains.
Compared with prior art, the beneficial effects of the present invention are：
The present invention is by controlling the means such as carbon content, solid solution and aging temp curve in metal powder or obtaining hardness
Up to HRC40-48；Dimensional accuracy is 2-2.5 ‰, while has the new type of injection molding stainless steel parts of higher toughness；Cost
It is lower by more than 20% than similary high rigidity and high-precision import stainless steel alloy.
Description of the drawings
Fig. 1 is the process route chart of the present invention.
Specific embodiment
In the following, with reference to attached drawing and specific embodiment, the present invention is described further, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
The present invention provides a kind of preparation method of new type of injection molding stainless steel parts, process route road as shown in Figure 1,
Include the following steps：
1) feeding is prepared：Metal powder with adhesive in mixer is sufficiently mixed, in 160-200 DEG C of refining, is crushed
After pelletize, obtain feeding；Carbon content≤0.03 of the metal powder；
In the step, the carbon content of metal powder is to influence the most critical factor of feeding and finished product hardness, carbon content control
Secondly system reduces the oxygen content of powder, to ensure the color of feeding powder and product strength as far as possible more than 0.03%；It is making
During grain, it should be ensured that granulation is uniform, to obtain subsphaeroidal powder；
In the step, using hard by copolymerized methanal resin 86-94%, EVA 3-5%, PP 1-3%, PE 1-3% and SA
The adhesive of resin acid 1-3% compositions, so that powdery fluids are interior in injection molding machine preferable mobility and preferable briquet shape,
Have a great impact to the quality of injection molding base, degreasing and dimensional accuracy, alloying component etc.；
2) it is injection moulded：Mold will be injected in using injection molding machine after feeding melten gel；
In the step, the melten gel of 93-96% volumes is first injected when injection molding machine is molded again in the case of pressurize by flow liner
It is all discharged in the cold slug well of distal end, to form fine and close, uniform blank；
3) degreasing：At 110-130 DEG C, at 4.5-6 cubic metres per hour, acid intake amount is in 3-6g/min, degreasing for nitrogen flow
7-8 hours；
Blank after degreasing, degreasing rate 7%-7.5%；
4) vacuum-sintering：It is warming up to 1300-1320 DEG C of vacuum-sintering；
After vacuum-sintering, the carbon content of blank further declines；
5) solution heat treatment：1040-1070 DEG C is warming up to, is atomized and cooled down using quenching oil, obtain solid solution；
6) it corrects：Closed oil repoussage shape；
In this step, closed complete whole correction is carried out using 100T hydraulic presses solid solution；
7) timeliness：In 460-500 DEG C of vacuum aging, new type of injection molding stainless steel parts are obtained.
The hardness for the new type stainless steel. corrosion resistance that the present invention obtains is up to HRC40-48；Dimensional accuracy be 2-2.5 ‰, while have compared with
High tenacity；Cost is lower by more than 20% than similary high rigidity and high-precision import stainless steel alloy.
In detailed description below, such as non-specified otherwise, used material or equipment all can be by commercially available or conventional
Technological means obtain.
In detailed description below, such as non-specified otherwise, recorded ratio is weight ratio.
In detailed description below, used metal powder specification is as follows：
The metal powder that embodiment 1-6 is used be comminuted steel shot, model 17-4ph (martensitic precipitation), respectively into
The mass percent divided is limited the quantity：C≤0.03；Mn≤1.00；Si≤1.00；Cr：15.5-17.5；Ni：3.0-5.0；P≤
0.04；Cu：4.0-5.0；Nb+Ta：0.15-0.45.
Embodiment 1：
A kind of preparation method of new type of injection molding stainless steel parts, includes the following steps：
1) feeding is prepared：Metal powder with adhesive in mixer is sufficiently mixed, in 180 DEG C of refinings, is made after broken
Grain, obtains feeding；
Adhesive in the step includes following component by weight percentage：Copolymerized methanal resin 90%, EVA
4%th, PP 2%, PE 2%, SA stearic acid 2%；
2) it is injection moulded：The volume for the injection 95% into mold being injected in after feeding melten gel using injection molding machine, pressurize row
Go out flow liner, mold is heated to after 130 DEG C of temperature 10min natural cooling again, obtains blank；
3) degreasing：At 120 DEG C, nitrogen flow is in 5m3/ h, using staged by the way of acid into acid, degreasing 1-2h, into
Acid amount is 3-4g/min, degreasing 3-4h, acid intake amount 5-6g/min, degreasing 5-6h, acid intake amount 3-4g/min；
4) vacuum-sintering：It is warming up to 1310 DEG C of vacuum-sinterings；
5) solution heat treatment：1050 DEG C of solid solutions are warming up in 3.5h, are filled with spray quenching oil cooling but after keeping the temperature 4h, quickly
Cooling obtains homogeneous solid solution；
6) it corrects：Closed oil repoussage shape is carried out to solid solution using 100T hydraulic presses；
7) timeliness：In 480 DEG C of vacuum agings, new type of injection molding stainless steel parts are obtained.
Intensity >=the 1300MPa for the new type of injection molding stainless steel parts that the present embodiment obtains, hardness 44HRC.
Embodiment 2：
A kind of preparation method of new type of injection molding stainless steel parts, includes the following steps：
1) feeding is prepared：Metal powder with adhesive in mixer is sufficiently mixed, in 170 DEG C of refinings, is made after broken
Grain, obtains feeding；
Adhesive in the step includes following component by weight percentage：Copolymerized methanal resin 88%, EVA
5%th, PP3%, PE 2%, SA stearic acid 2%；
2) it is injection moulded：The volume for the injection 94% into mold being injected in after feeding melten gel using injection molding machine, pressurize row
Go out flow liner, mold is heated to after 140 DEG C of temperature 10min natural cooling again, obtains blank；
3) degreasing：At 120 DEG C, nitrogen flow is in 5m3/ h, using staged by the way of acid into acid, degreasing 1-2h, into
Acid amount is 3-4g/min, degreasing 3-4h, acid intake amount 5-6g/min, degreasing 5-6h, acid intake amount 3-4g/min；
4) vacuum-sintering：It is warming up to 1300 DEG C of vacuum-sinterings；
5) solution heat treatment：1070 DEG C of solid solutions are warming up in 4h, are filled with spray quenching oil cooling but after keeping the temperature 4h, fast quickly cooling
But homogeneous solid solution is obtained；
6) it corrects：Closed oil repoussage shape is carried out to solid solution using 100T hydraulic presses；
7) timeliness：In 460 DEG C of vacuum agings, new type of injection molding stainless steel parts are obtained.
Intensity >=the 1000MPa for the new type of injection molding stainless steel parts that the present embodiment obtains, hardness 40HRC.
Embodiment 3：
A kind of preparation method of new type of injection molding stainless steel parts, includes the following steps：
1) feeding is prepared：Metal powder with adhesive in mixer is sufficiently mixed, in 160 DEG C of refinings, is made after broken
Grain, obtains feeding；
Adhesive in the step includes following component by weight percentage：Copolymerized methanal resin 87%, EVA
4%th, PP3%, PE3%, SA stearic acid 3%；
2) it is injection moulded：The volume for the injection 94% into mold being injected in after feeding melten gel using injection molding machine, pressurize row
Go out flow liner, mold is heated to after 140 DEG C of temperature 10min natural cooling again, obtains blank；
3) degreasing：At 120 DEG C, nitrogen flow is in 5m3/ h, using staged by the way of acid into acid, degreasing 1-2h, into
Acid amount is 3-4g/min, degreasing 3-4h, acid intake amount 5-6g/min, degreasing 5-6h, acid intake amount 3-4g/min；
4) vacuum-sintering：It is warming up to 1320 DEG C of vacuum-sinterings；
5) solution heat treatment：1040 DEG C of solid solutions are warming up in 4h, are filled with spray quenching oil cooling but after keeping the temperature 4h, fast quickly cooling
But homogeneous solid solution is obtained；
6) it corrects：Closed oil repoussage shape is carried out to solid solution using 100T hydraulic presses；
7) timeliness：In 500 DEG C of vacuum agings, new type of injection molding stainless steel parts are obtained.
Intensity >=the 1000MPa for the new type of injection molding stainless steel parts that the present embodiment obtains, hardness 38HRC.
Embodiment 4：
As different from Example 1, in defatting step, using balanced type into acid, acid intake amount is kept embodiment 4 during degreasing
Stable 4-5g/min；Intensity >=1200MPa of obtained new type of injection molding stainless steel parts, hardness 43HRC.
Embodiment 5：
As different from Example 1, in solution heat treating step, solid solubility temperature is 1070 DEG C to embodiment 5.What is obtained is novel
It is injection moulded the intensity >=1200MPa, hardness 42HRC of stainless steel parts.
Embodiment 6：
As different from Example 1, in solution heat treating step, solid solubility temperature is 1040 DEG C to embodiment 6.What is obtained is novel
It is injection moulded the intensity >=1200MPa, hardness 41HRC of stainless steel parts.
Comparative example 1：
Comparative example 1 as different from Example 1, the carbon content specification of the metal powder used for≤0.05, it is obtained not
Intensity >=the 1000MPa, hardness 33HRC for steel part of becoming rusty.
Comparative example 2：
Comparative example 2 as different from Example 1, using by copolymerized methanal resin 80%, EVA 10%, PP 5%, PE
The adhesive that 2% and SA stearic acid 3% forms.Intensity >=1100MPa of stainless steel parts obtained, hardness 41HRC.
The above embodiment is only the preferred embodiment of the present invention, it is impossible to the scope of protection of the invention is limited with this,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (10)
1. a kind of preparation method of new type of injection molding stainless steel parts, including：
Prepare feeding step：Metal powder with adhesive in mixer is sufficiently mixed, is refined in 160-200 DEG C, after crushing
Granulation, obtains feeding；Carbon content≤0.03% of the metal powder；
It is injection moulded step：Mold will be injected in using injection molding machine after feeding melten gel；
Defatting step：At 110-130 DEG C, at 4.5-6 cubic metres per hour, acid intake amount is in 3-6g/min, degreasing 7-8 for nitrogen flow
Hour；
Vacuum-sintering step：It is warming up to 1300-1320 DEG C of vacuum-sintering；
Solution heat treating step：1040-1070 DEG C is warming up to, is atomized and cooled down using quenching oil, obtain solid solution；
Aligning step：Closed oil repoussage shape；
Ageing stage：In 460-500 DEG C of vacuum aging, new type of injection molding stainless steel parts are obtained.
2. preparation method as described in claim 1, which is characterized in that prepare in feeding step, the adhesive is by by weight
The following components composition of percentages：Copolymerized methanal resin 85-94%, EVA 3-5%, PP 1-3%, PE 1-3% and SA are hard
Resin acid 1-3%.
3. preparation method as described in claim 1, which is characterized in that prepare in feeding step, the copper of the metal powder contains
It measures as 4.0-5.0%.
4. preparation method as described in claim 1, which is characterized in that in injection moulding step, 93-96% is injected into mold
The melten gel of volume, pressurize discharge flow liner, mold are heated to natural cooling after 100-140 DEG C of temperature.
5. preparation method as described in claim 1, which is characterized in that in defatting step, using staged into acid by the way of into
Acid, degreasing 1-2h, acid intake amount 3-4g/min, degreasing 3-4h, acid intake amount 5-6g/min, degreasing 5-6h, acid intake amount
For 3-4g/min.
6. preparation method as described in claim 1, which is characterized in that in solution heat treating step, concrete operations are：In 2-5h
1040-1070 DEG C of solid solution is inside warming up to, spray quenching oil cooling is filled with but after keeping the temperature 3-5h, is quickly cooled down to obtain homogeneous solid solution.
7. preparation method as described in claim 1, which is characterized in that in ageing stage, 460-480 is warming up in 0.5-1h
DEG C heat preservation 4-6h carry out vacuum aging, be filled with nitrogen cooling.
8. preparation method as described in claim 1, which is characterized in that in 1040-1070 DEG C of solid solution, in 480 DEG C of timeliness.
9. preparation method as described in claim 1, which is characterized in that in 1050 DEG C of solid solutions, in 480 DEG C of timeliness.
10. a kind of new type of injection molding stainless steel parts obtained such as claim 1-9 any one of them preparation methods.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110052600A (en) * | 2019-06-04 | 2019-07-26 | 苏州卓米智能制造科技有限公司 | A kind of processing method of MIM feeding |
| CN112475287A (en) * | 2020-11-28 | 2021-03-12 | 苏州创卓精密制造有限公司 | Metal powder forming process |
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| WO2009146385A1 (en) * | 2008-05-28 | 2009-12-03 | Deloro Stellite Holdings Corporation | Manufacture of composite components by powder metallurgy |
| CN102747308A (en) * | 2012-08-01 | 2012-10-24 | 上海加宁新技术研究所 | Method for producing high-strength non-magnetic stainless steel propeller shaft |
| CN103981436A (en) * | 2014-06-06 | 2014-08-13 | 海安县鹰球粉末冶金有限公司 | Metal powder injection molded high-strength martensite aged steel and preparation method thereof |
| CN106756148A (en) * | 2016-12-05 | 2017-05-31 | 北京科技大学 | The method that a kind of foundry alloy method of low oxygen content prepares MIM418 alloys |
-
2017
- 2017-12-06 CN CN201711278837.2A patent/CN108247064A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009146385A1 (en) * | 2008-05-28 | 2009-12-03 | Deloro Stellite Holdings Corporation | Manufacture of composite components by powder metallurgy |
| CN102747308A (en) * | 2012-08-01 | 2012-10-24 | 上海加宁新技术研究所 | Method for producing high-strength non-magnetic stainless steel propeller shaft |
| CN103981436A (en) * | 2014-06-06 | 2014-08-13 | 海安县鹰球粉末冶金有限公司 | Metal powder injection molded high-strength martensite aged steel and preparation method thereof |
| CN106756148A (en) * | 2016-12-05 | 2017-05-31 | 北京科技大学 | The method that a kind of foundry alloy method of low oxygen content prepares MIM418 alloys |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110052600A (en) * | 2019-06-04 | 2019-07-26 | 苏州卓米智能制造科技有限公司 | A kind of processing method of MIM feeding |
| CN112475287A (en) * | 2020-11-28 | 2021-03-12 | 苏州创卓精密制造有限公司 | Metal powder forming process |
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