CN110421174A - A kind of iron-based feeding formula of metal powder injection molded stainless steel-and production method - Google Patents
A kind of iron-based feeding formula of metal powder injection molded stainless steel-and production method Download PDFInfo
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- CN110421174A CN110421174A CN201910693944.4A CN201910693944A CN110421174A CN 110421174 A CN110421174 A CN 110421174A CN 201910693944 A CN201910693944 A CN 201910693944A CN 110421174 A CN110421174 A CN 110421174A
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
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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
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Abstract
The present invention discloses a kind of iron-based feeding formula of metal powder injection molded stainless steel-, including bonding agent and metal powder；Wherein, there are polyformaldehyde, polypropylene, EVA resin, stearic acid in bonding agent ingredient；A kind of iron-based feeding formula production method of metal powder injection molded stainless steel-, is used to prepare the iron-based feeding formula of metal powder injection molded stainless steel-, specific steps include ingredient, mixing, injection moulding, degreasing, sintering, Physico-chemical tests.It is described formula and method feeding is easy to make, cost is relatively low；Feeding good flowing properties, fabrication strength are high, can unlimited number reuse, discarded regrinding-material handle will not be generated；Debonding proces are simple, convenient for operation；Sintered density is high, good physical performance；It is common to degreasing process both domestic and external, equipment that no replacement is required；Replace external import feeding, overcome both at home and abroad it is metal powder injection molded with feeding is at high cost, poor fluidity, can not repetitive cycling use the shortcomings that.
Description
Technical field
The present invention relates to PM techniques, and specifically a kind of iron-based feeding of metal powder injection molded stainless steel-is matched
Side and method.
Background technique
Metal powder injection molded technology (Metal Injection Molding, abbreviation MIM) is recent domestic powder
In last metallurgy industry, combined with modern advanced injection molding of plastics technology and conventional powder metallurgy and formed one
Item new and high technology.It is advantageous that overcoming, prior powder metallurgy product material is uneven, structure is simple, processing is complicated, efficiency
The disadvantages of low, can manufacture arbitrarily complicated shape, and the smaller components of each position even density, and be particularly suitable for
In producing small-sized, complicated and with particular/special requirement metal parts in enormous quantities, ten are applied in terms of stainless steel and ferrous alloy
Divide extensive.
Metal powder injection molded is the formula of bonding agent with the key of feeding, it is the basis of entire MIM procedure
And core.Bonding agent is mixed by several compounds, is the carrier of metal powder filling die cavity in injection moulding, after forming
Bonding agent is totally removed by nitric acid degreasing or solvent dissolution.The superiority and inferiority of bonding agent quality will affect the forming of powder, group
Poly-, rheological behavior, degreasing, blank intensity, product density, dimensional tolerance, bonding agent inferior are easy to produce internal flaw, thus
The formula essence of bonding agent is exactly the core of metal powder injection molded technology.
The key of MIM technology is the preparation of feeding, and general metal powder injection molded feeding preparation domestic at present is multiple
It is miscellaneous, and there are poor fluidity, intensity is lower, unsticking is more difficult, density unevenness the defects of and many limitations；Many stainless steels and
The producer of iron-base products mostly buys external feeding, the feeding of especially German BASF, but its price is very expensive, be
The 2 times or more of domestic feeding causes production cost higher.
German BASF feeding poor fluidity, generally can only repetitive cycling use 5 times or so, can generate can not largely weigh
The regrinding-material handle used again.The feeding of this formula production is intended to few for BASF feeding poor fluidity and reuse number
Disadvantage, thus can the completely seamless German BASF feeding of substitution in quality and in terms of cost.
Summary of the invention
To overcome defect existing for the above-mentioned metal powder injection molded iron-based MIM feeding of stainless steel-both at home and abroad, the present invention is mentioned
For a kind of iron-based feeding formula of metal powder injection molded stainless steel-and method, wherein metal powder injection molded stainless steel-iron
Base feeding is formulated that feeding is easy to make, cost is relatively low, and feeding good flowing properties, fabrication strength are high, it is metal powder injection molded not
The rust iron-based feeding method simple process of steel-, sintering character are good.
The present invention, which solves the technical solution that technical problem uses, to be had: a kind of metal powder injection molded stainless steel-is iron-based to feed
Material formula, including bonding agent and metal powder；Wherein, there are polyformaldehyde, polypropylene, EVA resin, stearic acid in bonding agent ingredient；
Bonding agent mass percentage content is respectively polyformaldehyde 5-95%, polypropylene 1-45%, EVA resin 1-45% and stearic acid 1-
10% and a small amount of lubricant.
A kind of iron-based feeding formula production method of metal powder injection molded stainless steel-, is used to prepare the metal powder
Last injection moulding stainless steel-iron-based feeding formula, the specific steps are as follows:
S1 ingredient: according to the adhesive material in the metal powder injection molded iron-based feeding of stainless steel-and on a small quantity
Lubricant proportion, accurate weighing various composition are put into inside kneading machine；
S2 is kneaded: at 175-190 DEG C, being mixed 2 hours, is broken into after cooling to metal powder and bonding agent
Grain；Preferably, bonding agent mixing time is 30 minutes, and after bonding agent sufficiently melts mixing, metal powder is then added；
S3 injection moulding: broken mixture is transferred in injector, is 70-100MPa, temperature 175-190 in pressure
Injection base is formed under the conditions of DEG C；For 10g or less product, injection temperature is 175-190 DEG C, injection pressure 80MPa, when pressure maintaining
Between be 3s；
S4 degreasing: injection base is put into debinding furnace under the conditions of 90-140 DEG C degreasing 2-24 hours；Preferably, degreasing temperature
Degree is 120 DEG C, degreasing 2-12 hours；
S5 sintering: the injection base after degreasing being sent into sintering furnace and carries out vacuum-sintering, and maximum temperature is 1400 DEG C；It is preferred that
Ground, vacuum degree are higher than 10Pa；Preferably, heating rate is 5 DEG C per minute, 1000 DEG C or more 3 DEG C per minute within 1000 DEG C；It is excellent
Selection of land keeps the temperature 30 minutes in 400 DEG C, 600 DEG C, 900 DEG C, 1200 DEG C, and 1400 DEG C keep the temperature 2 hours；
S6 Physico-chemical tests: sintered metalwork is subjected to physical and chemical index detection as required.
The beneficial effects of the present invention are: feeding is easy to make, cost is relatively low；Feeding good flowing properties, fabrication strength are high, can
Unlimited number is reused, and discarded regrinding-material handle will not be generated；Debonding proces are simple, convenient for operation；Sintered density is high, physical
It can be good；It is common to degreasing process both domestic and external, equipment that no replacement is required；Replace external import feeding, overcomes domestic and international metal powder
Last injection moulding feeding is at high cost, poor fluidity, can not repetitive cycling the shortcomings that using.
Specific embodiment
A kind of iron-based feeding formula of metal powder injection molded stainless steel-, including bonding agent and metal powder；Wherein, it glues
Connecing has polyformaldehyde, polypropylene, EVA resin, stearic acid in agent ingredient；Bonding agent mass percentage content is respectively polyformaldehyde
65%, polypropylene 15%, EVA resin 15% and stearic acid 5% and a small amount of lubricant.
A kind of iron-based feeding formula production method of metal powder injection molded stainless steel-, is used to prepare the metal powder
Last injection moulding stainless steel-iron-based feeding formula, the specific steps are as follows:
S1 ingredient: according to the adhesive material in the metal powder injection molded iron-based feeding of stainless steel-and on a small quantity
Lubricant proportion, accurate weighing various composition are put into inside kneading machine；Specifically, bonding agent mass percentage content
It can be respectively polyformaldehyde 65%, polypropylene 15%, EVA resin 15% and stearic acid 5% and a small amount of lubricant.
S2 is kneaded: the bonding agent of aforementioned proportion being put into kneading machine, temperature is 175-190 DEG C, mixing time 30
Minute, it after bonding agent sufficiently melts mixing, is then added metal powder, then sufficiently mixing 2 hours, allows metal powder and bonding
Agent is lumped together, i.e., bonding agent is uniformly wrapped in metal powder granulates.Sheet or bulk are made after cooling, is broken on crusher
It is broken into particle.
S3 injection moulding: by said mixture, injection moulding, mixed feeding should have good on injection machine
Mobile performance can favorably accomplish Mold Filling Process in Injection Molding, obtain the injection base of required shape.When injection, according to product weight
Size adjusting process parameter, 10g or less product injection temperature are 175-190 DEG C, injection pressure 80MPa, dwell time 3s.
S4 degreasing: being put into injection base in dedicated debinding furnace and carry out degreasing, is heated by heating, makes acidic liquid and product
In bonding agent catalysis reaction occurs, to achieve the purpose that take off bonding agent, skimming temp is 120 DEG C, degreasing 2-12 hours.
S5 sintering: the blank after degreasing is sintered in vacuum sintering furnace, and vacuum degree is higher than 10Pa, and maximum temperature is
1400℃.Within 1000 DEG C heating rate be 5 DEG C per minute, 1000 DEG C or more 3 DEG C per minute, and 400 DEG C, 600 DEG C,
900 DEG C, 1200 DEG C keep the temperature 30 minutes, and 1400 DEG C keep the temperature 2 hours, and metal injection moulding part can be obtained.
S6 Physico-chemical tests: physical and chemical index is carried out after sintered metalwork is machined by customer requirement and detects whether to reach
Required standard, physical property have: density, hardness, dimensional tolerance etc.；Chemical property detection must do salt spray test etc., thus may be used
Examine feeding quality whether qualified.
Above-described embodiment is that more excellent way of realization of the invention should not be construed as to illustrate basic thought of the invention
To absolute limitation of the invention；Those skilled in the art, under the premise of not departing from basic thought of the invention, to this
The implementation of invention take with above-described embodiment not absolutely identical treatment measures, should also be considered as in rights protection of the invention
In range.
Claims (9)
1. a kind of iron-based feeding formula of metal powder injection molded stainless steel-, including bonding agent and metal powder, feature exist
In: there are polyformaldehyde, polypropylene, EVA resin, stearic acid in bonding agent ingredient；Bonding agent mass percentage content is respectively poly- first
Aldehyde 5-95%, polypropylene 1-45%, EVA resin 1-45% and stearic acid 1-10% and a small amount of lubricant.
2. the iron-based feeding formula of metal powder injection molded stainless steel-according to claim 1, it is characterised in that: bonding
Agent mass percentage content is respectively polyformaldehyde 65%, polypropylene 15%, EVA resin 15% and stearic acid 5% and a small amount of profit
Lubrication prescription.
3. a kind of iron-based feeding of metal powder injection molded stainless steel-is formulated production method, it is used to prepare the metal powder
Injection moulding stainless steel-iron-based feeding formula, it is characterised in that: specific steps include
S1 ingredient: according in the metal powder injection molded iron-based feeding of stainless steel-adhesive material and a small amount of lubrication
Agent proportion, accurate weighing various composition are put into inside kneading machine；
S2 is kneaded: at 175-190 DEG C, being mixed 2 hours to metal powder and bonding agent, is broken into particle after cooling；
S3 injection moulding: broken mixture is transferred in injector, is 175-190 DEG C of 70-100MPa, temperature item in pressure
Injection base is formed under part；
S4 degreasing: injection base is put into debinding furnace under the conditions of 90-140 DEG C degreasing 2-24 hours；
S5 sintering: the injection base after degreasing being sent into sintering furnace and carries out vacuum-sintering, and maximum temperature is 1400 DEG C；
S6 Physico-chemical tests: sintered metalwork is subjected to physical and chemical index detection as required.
4. the iron-based feeding of metal powder injection molded stainless steel-according to claim 3 is formulated production method, feature exists
In: in S2 mixing step, bonding agent mixing time is 30 minutes, and after bonding agent sufficiently melts mixing, metal powder is then added
End.
5. the iron-based feeding of metal powder injection molded stainless steel-according to claim 3 is formulated production method, feature exists
In: in S3 injection moulding step, 10g or less product injection temperature is 175-190 DEG C, injection pressure 80MPa, and the dwell time is
3s。
6. the iron-based feeding of metal powder injection molded stainless steel-according to claim 3 is formulated production method, feature exists
In: in S4 defatting step, skimming temp is 120 DEG C, degreasing 2-12 hours.
7. the iron-based feeding of metal powder injection molded stainless steel-according to claim 3 is formulated production method, feature exists
In: in S5 sintering step, vacuum degree is higher than 10Pa.
8. the iron-based feeding of metal powder injection molded stainless steel-according to claim 3 is formulated production method, feature exists
In: in S5 sintering step, heating rate is 5 DEG C per minute, 1000 DEG C or more 3 DEG C per minute within 1000 DEG C.
9. the iron-based feeding of metal powder injection molded stainless steel-according to claim 8 is formulated production method, feature exists
In: in S5 sintering step, 30 minutes are kept the temperature in 400 DEG C, 600 DEG C, 900 DEG C, 1200 DEG C, 1400 DEG C keep the temperature 2 hours.
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| CN201910693944.4A CN110421174A (en) | 2019-07-30 | 2019-07-30 | A kind of iron-based feeding formula of metal powder injection molded stainless steel-and production method |
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| CN201910693944.4A CN110421174A (en) | 2019-07-30 | 2019-07-30 | A kind of iron-based feeding formula of metal powder injection molded stainless steel-and production method |
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Cited By (3)
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| CN112045181A (en) * | 2020-09-18 | 2020-12-08 | 通达（厦门）精密橡塑有限公司 | Stainless steel feed and stainless steel part as well as preparation method and application thereof |
| CN116652175A (en) * | 2023-06-15 | 2023-08-29 | 陕西华夏粉末冶金有限责任公司 | Feeding component formula for metal powder injection molding and part preparation method thereof |
| CN117340252A (en) * | 2023-10-09 | 2024-01-05 | 广东潮艺金属实业有限公司 | High-heat-conductivity injection molding feed containing titanium-stainless steel composite powder and preparation method and application thereof |
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| CN117340252A (en) * | 2023-10-09 | 2024-01-05 | 广东潮艺金属实业有限公司 | High-heat-conductivity injection molding feed containing titanium-stainless steel composite powder and preparation method and application thereof |
| CN117340252B (en) * | 2023-10-09 | 2024-03-29 | 广东潮艺金属实业有限公司 | High-heat-conductivity injection molding feed containing titanium-stainless steel composite powder and preparation method and application thereof |
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