CN105290404A - Preparation method for hard alloy products by injection molding - Google Patents
Preparation method for hard alloy products by injection molding Download PDFInfo
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- CN105290404A CN105290404A CN201510628877.XA CN201510628877A CN105290404A CN 105290404 A CN105290404 A CN 105290404A CN 201510628877 A CN201510628877 A CN 201510628877A CN 105290404 A CN105290404 A CN 105290404A
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Abstract
The invention provides a preparation method for hard alloy products by injection molding. The preparation method mainly comprises the following steps: (1) mixing: hard alloy powder is mixed with adhesive to prepare an injection filler; (2) injection molding: the filler is in injection molding through an injector; (3) degreasing: solvent is degreased to remove part adhesive; (4) dewaxing and sintering: the dewaxing and the pre-sintering are performed in a sintering furnace; and (5) hot isostatic pressure sintering: the high-temperature and high-pressure sintering is performed in a hot isostatic pressure sintering furnace to obtain a compact product. The preparation method can be used for preparing the hard alloy products with various complex shapes through the injection molding process, holes can be eliminated through hot isostatic pressure sintering, and the bending strength and the fracture toughness are improved.
Description
Technical field
The present invention relates to carbide alloy and prepare technical field, particularly relate to a kind of preparation method of injection moulding hart metal product.
Background technology
Carbide alloy has high rigidity, high-wearing feature, good chemical stability and heat endurance, is widely used in modern tool material, high-abrasive material, exotic material, resistant material etc.Traditional compression-moulding methods cannot prepare complex-shaped product, and the size and shape of goods is subject to certain restrictions, and easily deforms and dimension overproof.Injection molding technology can manufacture complex-shaped, dimension precision requirement is high, the goods produced in enormous quantities, even density, respectively to contraction phase with, similar to hot investment casting, and precision and surface roughness good, without the need to following process.
No matter carbide alloy is vacuum-sintering or hydrogen sintering, and after sintering, carbide alloy inside often leaves hole, and these holes are the formation of crack causing product to destroy.Adopt hot isostatic pressing processing method, contribute to the restructuring of carbide alloy crystal grain, can hole be eliminated, improve bending strength and fracture toughness, obtain densified product, thus ensure that product quality.
Summary of the invention
The present invention aims to provide a kind of preparation method of injection moulding hart metal product, can prepare various cemented carbide with complicated shape product, can eliminate interiors of products hole, enhance product performance by HIP sintering.
For solving the problem, the present invention adopts technical scheme:
A preparation method for injection moulding hart metal product, comprises the steps:
(1) mixing: cemented carbide powder and binding agent are proportionally taken, add in mixing roll, heat and mixing a period of time;
(2) granulate: adopt extrusion device that feeding is extruded into band shape, strip, granulated by pulverizer;
(3) injection moulding: adopt injector to inject carbide alloy injection base the feeding after granulating;
(4) degreasing: adopt solvent degreasing, remove portion of binder in a solvent;
(5) dewaxing and sintering: dewax in sintering furnace and heat, carries out vacuum presintering;
(6) HIP sintering: after presintering, product is put into HIP sintering stove and adopted HTHP to sinter, obtains densification product.
The present invention also adopts following technical measures for achieving the above object.
The preparation method of aforesaid a kind of injection moulding hart metal product, the constituent of wherein said binding agent and mass percent thereof are: paraffin 70 ~ 80%, high density polyethylene (HDPE) 5 ~ 10%, polypropylene 5 ~ 10% and stearic acid 10 ~ 20%.
The preparation method of aforesaid a kind of injection moulding hart metal product, wherein said melting temperature is 120 ~ 180 DEG C, and mixing time is 2 ~ 6h.
The preparation method of aforesaid a kind of injection moulding hart metal product, wherein said injection temperature is 160 ~ 180 DEG C, and injection pressure is 60 ~ 80MPa, and mould temperature is 30 DEG C.
The preparation method of aforementioned a kind of injection moulding hart metal product, the one in trichloro-ethylene, chloroform or normal heptane is selected in wherein said solvent degreasing, and skimming temp is 45 ~ 70 DEG C, and degreasing time is 5 ~ 8h.
The preparation method of aforesaid a kind of injection moulding hart metal product, the sintering temperature of wherein said dewaxing and sintering is 1390 ~ 1450 DEG C, and temperature retention time is 60 ~ 90min, adopts vacuum-sintering.
The preparation method of aforesaid a kind of injection moulding hart metal product, the sintering temperature of wherein said HIP sintering is 1300 ~ 1400 DEG C, and temperature retention time is 30 ~ 60min, and pressure is 80 ~ 100MPa.
Compared with prior art, the present invention has at least following beneficial effect:
(1) adopt injection molding technology, can prepare complex-shaped product, raw material availability is high, is applicable to producing in enormous quantities;
(2) adopt HIP sintering method, interiors of products hole can be eliminated, contribute to product densified, be conducive to enhancing product performance.
Detailed description of the invention
Referring to specific embodiment, the present invention is described.It will be appreciated by those skilled in the art that these embodiments are only for illustration of the present invention, its scope do not limited the present invention in any way.
The preparation method of the injection moulding hart metal product of the embodiment 1:YG8 trade mark:
(1) mixing: 75% cemented carbide powder and 25% binding agent to be taken according to weight ratio, adds in mixing roll.Wherein, binding agent consist of 75% paraffin, 5% high density polyethylene (HDPE), 5% polypropylene and 15% stearic acid.Be heated to 140 DEG C at mixing machine, mixing time is 6h;
(2) granulate: adopt extrusion device feeding to be extruded into each three times of band shape, strip, granulated by pulverizer;
(3) injection moulding: adopt injector to inject the carbide alloy injection base of various shape the feeding after granulating.Injection temperature is 160 DEG C, and injection pressure is 60MPa, and mould temperature is about 30 DEG C;
(4) degreasing: remove portion of binder in trichloroethylene solvent, skimming temp is 50 DEG C, and degreasing time is 7h;
(5) dewaxing and sintering: carry out dewaxing and sintering in dewaxing-sintering furnace, sintering temperature is 1420 DEG C, and temperature retention time is 60min, vacuum-sintering;
(6) HIP sintering: carry out HTHP sintering in HIP sintering stove, sintering temperature is 1380 DEG C, and medium is Ar gas, and temperature retention time is 40min, and pressure is 80MPa;
The preparation method of the injection moulding hart metal product of the embodiment 2:YG13 trade mark:
(1) mixing: 75% cemented carbide powder and 25% binding agent to be taken according to weight ratio, adds in mixing roll.Wherein, binding agent consist of 70% paraffin, 5% high density polyethylene (HDPE), 5% polypropylene and 20% stearic acid.Be heated to 140 DEG C at mixing machine, mixing time is 6h;
(2) granulate: adopt extrusion device feeding to be extruded into each three times of band shape, strip, granulated by pulverizer;
(3) injection moulding: adopt injector to inject the carbide alloy injection base of various shape the feeding after granulating.Injection temperature is 160 DEG C, and injection pressure is 60MPa, and mould temperature is about 30 DEG C;
(4) degreasing: remove portion of binder in trichloroethylene solvent, skimming temp is 50 DEG C, and degreasing time is 7h;
(5) dewaxing and sintering: carry out dewaxing and sintering in dewaxing-sintering furnace, sintering temperature is 1390 DEG C, and temperature retention time is 60min, vacuum-sintering;
(6) HIP sintering: carry out HTHP sintering in HIP sintering stove, sintering temperature is 1350 DEG C, and medium is Ar gas, and temperature retention time is 40min, and pressure is 80MPa;
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (7)
1. a preparation method for injection moulding hart metal product, is characterized in that comprising the steps:
(1) mixing: cemented carbide powder and binding agent are proportionally taken, add in mixing roll, heat and mixing a period of time;
(2) granulate: adopt extrusion device that feeding is extruded into band shape, strip, granulated by pulverizer;
(3) injection moulding: adopt injector to inject carbide alloy injection base the feeding after granulating;
(4) degreasing: adopt solvent degreasing, remove portion of binder in a solvent;
(5) dewaxing and sintering: dewax in sintering furnace and heat, carries out vacuum presintering;
(6) HIP sintering: after presintering, product is put into HIP sintering stove and adopted HTHP to sinter, obtains densification product.
2. the preparation method of a kind of injection moulding hart metal product as claimed in claim 1, it is characterized in that, the constituent of described binding agent and mass percent thereof are: paraffin 70 ~ 80%, high density polyethylene (HDPE) 5 ~ 10%, polypropylene 5 ~ 10% and stearic acid 10 ~ 20%.
3. the preparation method of a kind of injection moulding hart metal product as claimed in claim 1, it is characterized in that: melting temperature is 120 ~ 180 DEG C, mixing time is 2 ~ 6h.
4. the preparation method of a kind of injection moulding hart metal product as claimed in claim 1, it is characterized in that: injection temperature is 160 ~ 180 DEG C, injection pressure is 60 ~ 80MPa, and mould temperature is 30 DEG C.
5. the preparation method of a kind of injection moulding hart metal product as claimed in claim 1, is characterized in that: the one in trichloro-ethylene, chloroform or normal heptane is selected in solvent degreasing, and skimming temp is 45 ~ 70 DEG C, and degreasing time is 5 ~ 8h.
6. the preparation method of a kind of injection moulding hart metal product as claimed in claim 1, is characterized in that: the sintering temperature of dewaxing and sintering is 1390 ~ 1450 DEG C, and temperature retention time is 60 ~ 90min, adopts vacuum-sintering.
7. the preparation method of a kind of injection moulding hart metal product as claimed in claim 1, is characterized in that: the sintering temperature of HIP sintering is 1300 ~ 1400 DEG C, and temperature retention time is 30 ~ 60min, and pressure is 80 ~ 100MPa.
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| CN201510628877.XA CN105290404A (en) | 2015-09-29 | 2015-09-29 | Preparation method for hard alloy products by injection molding |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282625A (en) * | 2016-08-02 | 2017-01-04 | 江苏省海洋资源开发研究院(连云港) | A kind of near-net-shape method of ultra-fine cemented carbide |
| CN106312074A (en) * | 2016-08-25 | 2017-01-11 | 苏州赛特锐精密机械配件有限公司 | Preparation method for superfine hard alloy cutter blank with preformed cutter groove |
| CN108101541A (en) * | 2017-12-21 | 2018-06-01 | 洛阳名力科技开发有限公司 | A kind of ejection forming method of non-bond cemented carbide |
| CN108115141A (en) * | 2017-12-21 | 2018-06-05 | 洛阳名力科技开发有限公司 | A kind of ejection forming method of Ultra-fine WC-Co Cemented Carbide |
| CN108339973A (en) * | 2018-02-02 | 2018-07-31 | 东莞华晶粉末冶金有限公司 | Hard alloy is injection moulded feeding and preparation method thereof |
| CN109047749A (en) * | 2018-07-18 | 2018-12-21 | 东莞华晶粉末冶金有限公司 | The preparation method of environment-friendly type cemented carbide powder feeding and hard alloy components |
| CN110181059A (en) * | 2018-12-13 | 2019-08-30 | 苏州赛特锐精密机械配件有限公司 | A kind of method of co-injection near-net-shape ultra-fine cemented carbide cutter green body |
-
2015
- 2015-09-29 CN CN201510628877.XA patent/CN105290404A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282625A (en) * | 2016-08-02 | 2017-01-04 | 江苏省海洋资源开发研究院(连云港) | A kind of near-net-shape method of ultra-fine cemented carbide |
| CN106312074A (en) * | 2016-08-25 | 2017-01-11 | 苏州赛特锐精密机械配件有限公司 | Preparation method for superfine hard alloy cutter blank with preformed cutter groove |
| CN106312074B (en) * | 2016-08-25 | 2018-02-02 | 苏州赛特锐精密机械配件有限公司 | A kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide |
| CN108101541A (en) * | 2017-12-21 | 2018-06-01 | 洛阳名力科技开发有限公司 | A kind of ejection forming method of non-bond cemented carbide |
| CN108115141A (en) * | 2017-12-21 | 2018-06-05 | 洛阳名力科技开发有限公司 | A kind of ejection forming method of Ultra-fine WC-Co Cemented Carbide |
| CN108339973A (en) * | 2018-02-02 | 2018-07-31 | 东莞华晶粉末冶金有限公司 | Hard alloy is injection moulded feeding and preparation method thereof |
| CN109047749A (en) * | 2018-07-18 | 2018-12-21 | 东莞华晶粉末冶金有限公司 | The preparation method of environment-friendly type cemented carbide powder feeding and hard alloy components |
| CN110181059A (en) * | 2018-12-13 | 2019-08-30 | 苏州赛特锐精密机械配件有限公司 | A kind of method of co-injection near-net-shape ultra-fine cemented carbide cutter green body |
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