CN106735170B - A kind of injection moulding method of big part metalwork - Google Patents

A kind of injection moulding method of big part metalwork Download PDF

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Publication number
CN106735170B
CN106735170B CN201611181832.3A CN201611181832A CN106735170B CN 106735170 B CN106735170 B CN 106735170B CN 201611181832 A CN201611181832 A CN 201611181832A CN 106735170 B CN106735170 B CN 106735170B
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metalwork
big
injection moulding
finished
mold
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CN106735170A (en
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陈冬检
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Foshan Platinum Magnesium Special Metal Technology Co Ltd
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Foshan Platinum Magnesium Special Metal Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/103Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22Manufacture 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
    • B22F3/225Manufacture 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

Abstract

The invention discloses a kind of injection (MIM) forming method of big part metalwork, this method include sintering raw material pre-treatment, raw material cladding, feeding be granulated, design mold, injection moulding, degreasing, splicing, sintering.When the present invention is by manufacturing big part metalwork this method solve traditional MIM method, due to being bubbled caused by degreasing not exclusively, the problems such as cracking, production safety hidden danger is avoided while realizing the quality for improving big part metalwork.

Description

A kind of injection moulding method of big part metalwork
Technical field
The invention belongs to be injection moulded processing technique field, and in particular to a kind of injection moulding method of big part metalwork.
Background technique
Metal injection moulding (MIM) is the forming being injected in the plasticising mixture of metal powder and its binder in model Method is a kind of method of novel metal industrial products production moulding;Specifically first selected powder is mixed with binder, Then mixture is pelletized shape required for injection moulding again.Currently, in traditional MIM technique, when metalwork compared with It when big, is easy to lead to the bubbling occurred in sintering process because degreasing is incomplete, the problems such as cracking, the quality of product not can guarantee.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of injection moulding sides of big part metalwork Method solves when traditional method manufactures big part metalwork since degreasing not exclusively causes sintering not exclusively to cause to be easy to appear The problems such as being bubbled, cracking avoids production safety hidden danger while realizing the quality for improving big part metalwork.
To solve the above problems, the technical solution adopted in the present invention is as follows:
A kind of injection moulding method of big part metalwork, method includes the following steps:
1) raw material pre-treatment: the metal powder drying of purchase is dried;
2) raw material coat: being added to by step 1) treated metal powder with POM, PE, PP and antioxidant Mixing is carried out in kneading machine, obtains paste after being mixed thoroughly;
3) feeding is granulated: the paste that step 2 is obtained passes through extruder extruding pelletization, obtains particulate material;
4) it designs mold: matching designed for making the mold of the metalwork in band connection hole and for making with connecting hole Connector mold
5) injection of metallic part: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained Metalwork semi-finished product with connecting hole;
6) inject connector: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained The connector to match with connecting hole described in step 5);
7) degreasing: by above-mentioned steps 5) the obtained connector of obtained part metalwork semi-finished product and step 6) puts debinding furnace into Middle removing POM;
8) splice: more than two metalworks obtained after degreasing are connect to form complete big part metal by connector Part semi-finished product;
9) it is sintered: being transferred in vacuum drying oven and be sintered by the obtained big part metalwork semi-finished product of step 8), obtain finished product.
As further embodiment, metal powder described in step 2) of the invention and POM, PE, PP and antioxidant Dosage be calculated in mass percent and be respectively as follows:
POM 3%-10%;
PE 4%-6%;
PP 2%-4%;
Antioxidant 0.1%-1%;
Metal powder surplus.
As further embodiment, use the temperature setting of the mixing of kneading machine for 160-200 in step 2) of the invention DEG C, mixing time is 1.5-2.5 hours.
As further embodiment, in step 7) skimming processes of the invention, catalyzed gas HNO3, the temperature of debinding furnace It is set as 110-130 DEG C, degreasing time is 4-12 hours.
As further embodiment, it is 0.01- that the catalyzed gas of the invention, which is passed through the rate in debinding furnace, 0.05mL/min。
As further embodiment, the temperature of step 9) sintering of the invention is 1200-1400 DEG C.
As further embodiment, the metal powder of the invention is ferroalloy powder, powder of stainless steel, Titanium Powder One of end, Al alloy powder, titanium powder.
It further include to step 9) in the injection moulding method of the big part metalwork of the invention as further embodiment Sintered big part metalwork carries out complete densification in HIP sintering furnace again.
As further embodiment, during at densification, the temperature of sintering furnace is 1200-1360 DEG C.
As further embodiment, in step 8) splicing of the invention, boron powder is coated at the both ends of connector.
Compared with prior art, the beneficial effects of the present invention are:
1. being mentioned in the injection moulding method of big part metalwork of the present invention by realizing the processing to metal powder The high utilization rate of raw material, greatly reduces the requirement to equipment, has saved manufacturing cost;
2. the injection moulding method of big part metalwork of the present invention solves traditional method and manufactures big part metalwork When, since skimming processes do not lead to bubbling caused by sintering not exclusively, cracking completely, realize big part metalwork volume production It is feasible.
Invention is further described in detail With reference to embodiment.
Specific embodiment
The injection moulding method of big part metalwork of the present invention, method includes the following steps:
A kind of injection moulding method of big part metalwork, method includes the following steps:
1) raw material pre-treatment: the metal powder drying of purchase is dried;
2) raw material coat: being added to by step 1) treated metal powder with POM, PE, PP and antioxidant Mixing is carried out in kneading machine, obtains paste after being mixed thoroughly;
3) feeding is granulated: the paste that step 2 is obtained passes through extruder extruding pelletization, obtains particulate material;
4) it designs mold: matching designed for making the mold of the metalwork in band connection hole and for making with connecting hole Connector mold
5) injection of metallic part: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained Metalwork semi-finished product with connecting hole;
6) inject connector: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained The connector to match with connecting hole described in step 5);
7) degreasing: by above-mentioned steps 5) the obtained connector of obtained part metalwork semi-finished product and step 6) puts debinding furnace into Middle removing POM;
8) splice: more than two metalworks obtained after degreasing are connect to form complete big part metal by connector Part semi-finished product;
9) it is sintered: being transferred in vacuum drying oven and be sintered by the obtained big part metalwork semi-finished product of step 8), obtain finished product.
As further embodiment, metal powder described in step 2) of the invention and POM, PE, PP and antioxidant Dosage be calculated in mass percent and be respectively as follows:
POM 3%-10%;
PE 4%-6%;
PP 2%-4%;
Antioxidant 0.1%-1%;
Metal powder surplus.
In the present invention, " POM " refers to polyformaldehyde, is used as bonding agent in the above scheme, to metal powder Play the role of flowing and bonding during mixing cladding." PE " i.e. polyethylene, in the above scheme, PE play metal before sintering Guarantor's type of part semi-finished product acts on;Preferably, in the present invention, polyethylene uses high density polyethylene (HDPE)." PP " i.e. polypropylene, Play the role of guarantor's type of metalwork semi-finished product before being sintered.
As further embodiment, use the temperature setting of the mixing of kneading machine for 160-200 in step 2) of the invention DEG C, mixing time is 1.5-2.5 hours.
In skimming processes of the invention, the principle of catalysis degreasing is using a kind of catalyst organic carrier molecules depolymerization For lesser volatilizable molecule, the organic carrier molecules in the other skimming processes of these molecular proportions have higher vapour pressure, energy Promptly diffuse out green body.Therefore, degreasing rate is influenced by skimming temp, since polyformaldehyde under acidity effect is opened by end Beginning is gradually decomposed, and with the increase of reaction temperature, but temperature is excessively high, is kept catalysis degreasing reaction too fast, is generated in green body There is degreasing defect in the excessive green body that will cause of small organic molecule air pressure;In addition temperature is excessively high, will cause green body softening transform;And it urges Change skimming temp is too low, and the speed of the too small this depolymerization reaction of debinding rate increases, and debinding rate is caused to increase.Furthermore degreasing Rate is influenced by degreasing catalysis time, is embodied in as the catalysis degreasing time increases, and injection moulding base degreasing amount increases, and And as the time increases, degreasing amount increases trend and flattens surely.Therefore, as a preferred option, step 7) of the present invention is de- During rouge, catalyzed gas HNO3, the temperature setting of debinding furnace is 110-130 DEG C, and degreasing time is 4-12 hours.
In skimming processes of the invention, HNO3Gas flow increases so that HNO in catalyzed gas3Concentration increases, to promote Into the depolymerization reaction of POM, but HNO3The flow of gas can not be too big, if HNO3The too big catalyzed gas of concentration has certain Corrosivity, can cause damages to powder and equipment.Therefore, as a preferred option, catalyzed gas of the present invention is passed through Rate in debinding furnace is 0.01-0.05mL/min.
As further embodiment, the temperature of step 9) sintering of the present invention is 1200-1400 DEG C.
As further embodiment, metal powder of the present invention is ferroalloy powder, powder of stainless steel, Titanium Powder One of end, Al alloy powder, titanium powder etc..Due to carrying out a series of processing to metal powder before the injection molding, because This in the present invention and is not required to the pattern to metal powder, oxygen content and partial size and does special requirement.
As further embodiment, in step 8) splicing of the invention, the coating boron powder or same at the both ends of connector Metalloid powder.In the present invention, coating boron powder or the effect of similar metal powder is that can be connection during the sintering process It is even closer between part and connecting hole to be bonded by boron powder, keep the combination between metalwork stronger.
In the present invention, to connect the connector of metalwork can be bolt be also possible to bolt equivalent effect its The connector of his structure type.
It is specific embodiment of the present invention below, the raw material employed in following case study on implementation, equipment etc. can lead to Cross commercial channel acquisition.
Embodiment 1
A kind of injection moulding method of big part metalwork, method includes the following steps:
1) raw material pre-treatment: the Al alloy powder drying of purchase is dried;
2) raw material coat: being added to by step 1) treated metal powder with POM, PE, PP and antioxidant It is carried out mixing 2.5 hours in 180 DEG C of kneading machine, obtains paste after being mixed thoroughly;Wherein the metal powder with The dosage of POM, PE, PP and antioxidant, which is calculated in mass percent, to be respectively as follows:
POM 3%;
PE 4%;
PP 4%;
Antioxidant 0.1%;
Metal powder surplus;
3) feeding is granulated: the paste that step 2 is obtained passes through extruder extruding pelletization, obtains particulate material;
4) it designs mold: matching designed for making the mold of the metalwork in band connection hole and for making with connecting hole Connector mold
5) injection of metallic part: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained Metalwork semi-finished product with connecting hole;
6) inject connector: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained The connector to match with connecting hole described in step 5);
7) degreasing: by above-mentioned steps 5) the obtained connector of obtained part metalwork semi-finished product and step 6) puts debinding furnace into Middle removing POM;Catalyzed gas is HNO in skimming processes3, HNO3It is 0.01mL/min, degreasing that gas, which is passed through the rate in skimmed milk, The temperature setting of furnace is 110 DEG C, and degreasing time is 4 hours;
8) splice: more than two metalworks obtained after degreasing are connect to form complete big part metal by connector Part semi-finished product;
9) it is sintered: being transferred in vacuum drying oven by the obtained big part metalwork semi-finished product of step 7), in 1200 DEG C of temperature Lower sintering, obtains finished product.
In this embodiment, degreasing rate 86.7%.
Embodiment 2
A kind of injection moulding method of big part metalwork, method includes the following steps:
1) raw material pre-treatment: the ferroalloy end drying of purchase is dried;
2) raw material coat: being added to by step 1) treated metal powder with POM, PE, PP and antioxidant It is carried out mixing 2 hours in 180 DEG C of kneading machine, obtains paste after being mixed thoroughly;Wherein the metal powder and POM, The dosage of PE, PP and antioxidant, which is calculated in mass percent, to be respectively as follows:
POM 6%;
PE 6%;
PP 4%;
Antioxidant 0.6%;
Metal powder surplus;
3) feeding is granulated: the paste that step 2 is obtained passes through extruder extruding pelletization, obtains particulate material;
4) it designs mold: matching designed for making the mold of the metalwork in band connection hole and for making with connecting hole Connector mold
5) injection of metallic part: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained Metalwork semi-finished product with connecting hole;
6) inject connector: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained The connector to match with connecting hole described in step 5);
7) degreasing: the part metalwork semi-finished product by above-mentioned steps 5,6) obtained, which are put into, removes POM in debinding furnace;Skimming processes Middle catalyzed gas is HNO3, HNO3It is 0.01mL/min that gas, which is passed through the rate in skimmed milk, and the temperature setting of debinding furnace is 120 DEG C, degreasing time is 10 hours;
8) splice: more than two metalworks obtained after degreasing are connect to form complete big part metal by connector Part semi-finished product;
9) it is sintered: being transferred in vacuum drying oven by the obtained big part metalwork semi-finished product of step 8), in 1250 DEG C of temperature Lower sintering, obtains finished product.
In this embodiment, degreasing rate 87.4%.
Embodiment 3
A kind of injection moulding method of big part metalwork, method includes the following steps:
1) raw material pre-treatment: the powder of stainless steel drying of purchase is dried;
2) raw material coat: being added to by step 1) treated metal powder with POM, PE, PP and antioxidant It is carried out mixing 1.5 hours in 200 DEG C of kneading machine, obtains paste after being mixed thoroughly;Wherein the metal powder with The dosage of POM, PE, PP and antioxidant, which is calculated in mass percent, to be respectively as follows:
POM 8%;
PE 4%;
PP 2%;
Antioxidant 0.8%;
Metal powder surplus;
3) feeding is granulated: the paste that step 2 is obtained passes through extruder extruding pelletization, obtains particulate material;
4) it designs mold: matching designed for making the mold of the metalwork in band connection hole and for making with connecting hole Connector mold
5) injection of metallic part: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained Metalwork semi-finished product with connecting hole;
6) inject connector: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained The connector to match with connecting hole described in step 5);
7) degreasing: the part metalwork semi-finished product by above-mentioned steps 5,6) obtained, which are put into, removes POM in debinding furnace;It will be above-mentioned big Part metalwork semi-finished product, which are put into, removes POM in debinding furnace;Catalyzed gas is HNO in skimming processes3, HNO3Gas is passed through skimmed milk In rate be 0.01mL/min, the temperature setting of debinding furnace is 125 DEG C, and degreasing time is 11 hours;
8) splice: more than two metalworks obtained after degreasing are connect to form complete big part metal by connector Part semi-finished product;
9) it is sintered: being transferred in vacuum drying oven by the obtained big part metalwork semi-finished product of step 8), in 1300 DEG C of temperature Lower sintering, obtains finished product.
In this embodiment, degreasing rate 88.3%.
Embodiment 4
A kind of injection moulding method of big part metalwork, method includes the following steps:
1) raw material pre-treatment: the titanium alloy powder drying of purchase is dried;
2) raw material coat: being added to by step 1) treated metal powder with POM, PE, PP and antioxidant It is carried out mixing 2 hours in 180 DEG C of kneading machine, obtains paste after being mixed thoroughly;Wherein the metal powder and POM, The dosage of PE, PP and antioxidant, which is calculated in mass percent, to be respectively as follows:
POM 10%;
PE 5%;
PP 3%;
Antioxidant 1%;
Metal powder surplus;
3) feeding is granulated: the paste that step 2 is obtained passes through extruder extruding pelletization, obtains particulate material;
4) it designs mold: matching designed for making the mold of the metalwork in band connection hole and for making with connecting hole Connector mold
5) injection of metallic part: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained Metalwork semi-finished product with connecting hole;
6) inject connector: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained The connector to match with connecting hole described in step 5);
7) degreasing: the part metalwork semi-finished product by above-mentioned steps 5,6) obtained, which are put into, removes POM in debinding furnace;Skimming processes Middle catalyzed gas is HNO3, HNO3It is 0.01mL/min that gas, which is passed through the rate in skimmed milk, and the temperature setting of debinding furnace is 130 DEG C, degreasing time is 4-12 hours;
8) splice: more than two metalworks obtained after degreasing are connect to form complete big part metal by connector Part semi-finished product;
9) it is sintered: being transferred in vacuum drying oven by the obtained big part metalwork semi-finished product of step 8), in 1400 DEG C of temperature Lower sintering, obtains finished product.
In this embodiment, degreasing rate 88.9%.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto, 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 (7)

1. a kind of injection moulding method of big part metalwork, which is characterized in that method includes the following steps:
1) raw material pre-treatment: the metal powder drying of purchase is dried;
2) raw material coat: being added to mixing by step 1) treated metal powder and POM, PE, PP and antioxidant Mixing is carried out in machine, obtains paste after being mixed thoroughly,
The dosage of the metal powder and POM, PE, PP and antioxidant, which are calculated in mass percent, to be respectively as follows:
POM 3%-10%;
PE 4%-6%;
PP 2%-4%;
Antioxidant 0.1%-1%;
Metal powder surplus;
3) feeding is granulated: the paste that step 2) is obtained passes through extruder extruding pelletization, obtains particulate material;
4) mold is designed: designed for making the mold of the metalwork in band connection hole and for making the company to match with connecting hole The mold of fitting;
5) injection of metallic part: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is had The metalwork semi-finished product of connecting hole;
6) inject connector: the particulate material that step 3) is obtained is injected in the mold of step 4) with injector, is obtained and is walked The connector that rapid 5) the described connecting hole matches;
7) degreasing: by above-mentioned steps 5) the obtained connector of obtained metalwork semi-finished product and step 6) puts into debinding furnace and removes POM;
8) splice: more than two metalworks obtained after degreasing are connected to form complete big part metalwork by connector Semi-finished product;
9) it is sintered: being transferred in vacuum drying oven and be sintered by the obtained big part metalwork semi-finished product of step 8), obtain finished product.
2. the injection moulding method of big part metalwork according to claim 1, which is characterized in that using mixing in step 2) The temperature setting of the mixing of machine is 160-200 DEG C, and mixing time is 1.5-2.5 hours.
3. the injection moulding method of big part metalwork according to claim 1, which is characterized in that step 7) skimming processes In, catalyzed gas HNO3, the temperature setting of debinding furnace is 110-130 DEG C, and degreasing time is 4-12 hours.
4. the injection moulding method of big part metalwork according to claim 3, which is characterized in that catalyzed gas is passed through degreasing Rate in furnace is 0.01-0.05mL/min.
5. the injection moulding method of big part metalwork according to claim 1, which is characterized in that the temperature of step 9) sintering It is 1200-1400 DEG C.
6. the injection moulding method of big part metalwork according to claim 1, which is characterized in that the metal powder is iron One of alloy powder, powder of stainless steel, titanium alloy powder, Al alloy powder, titanium powder.
7. the injection moulding method of big part metalwork according to claim 6, which is characterized in that step 8) splicing In, boron is coated on the surface of connector.
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