CN100519010C - Method of producing hard alloy rotatable special-shaped blade - Google Patents
Method of producing hard alloy rotatable special-shaped blade Download PDFInfo
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- CN100519010C CN100519010C CNB2007100359156A CN200710035915A CN100519010C CN 100519010 C CN100519010 C CN 100519010C CN B2007100359156 A CNB2007100359156 A CN B2007100359156A CN 200710035915 A CN200710035915 A CN 200710035915A CN 100519010 C CN100519010 C CN 100519010C
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Abstract
The present invention relates to one kind of turnable specially shaped hard WC-Co alloy cutting blade produced through powder injection forming. The present invention features that WC-Co mixture powder is mixed with multicomponent adhesive comprising paraffin, oil, low molecular coupler and polymer to form homogeneous mixture material; the mixture material is injection formed into the turnable specially shaped cutting blade blank; and the turnable specially shaped cutting blade blank is defatted in some solution in the defatting rate controlled in 45-65 % and finally hot defatted and sintered to obtain the turnable specially shaped hard WC-Co alloy cutting blade. The turnable specially shaped hard WC-Co alloy cutting blade has high mechanical performance and size deviation within 0.5 %.
Description
Technical field:
The present invention relates to field of powder metallurgy, particularly adopt the powder metallurgy near-net-shape method to prepare the method for hard alloy rotatable special-shaped blade.
Background technology:
Carbide alloy has high strength, high rigidity, series of advantages such as wear-resistant, corrosion-resistant, is indispensable structural material and tool materials in national economy and the national defense construction.But also making, its high strength and high rigidity himself process very difficulty.At present, die forming can only the production shape specification, simple carbide chip, for complex-shaped special-shaped blade, produces very difficulty, need following process usually, and highly difficult following process has increased production cost of products undoubtedly.Powder injection forming is emerging in the last few years a kind of powder metallurgy near-net-shape technology, have once-forming and be net shape, processing less or do not have processing, characteristics that stock utilization is high, have very large technical advantage and lower financial cost at production carbide alloy special-shaped blade.But when powder injection forming is used to prepare carbide alloy, introduced the organic binder bond of a large amount of (45～55%), when hot degreasing, cause the skewness of carbon residue or carbon easily, be difficult to control because of volume contraction makes size greatly during sintering, thereby the injection moulding hart metal product often exists that intensity is on the low side, unstable properties and the low problem of dimensional accuracy.In these years, this two hang-up never is well solved.Therefore, adopting powder injection forming to prepare the carbide alloy special-shaped blade especially during indexable insert tip, throw away tip, require blade to have high bending strength and hardness, this will accurately control the alloy carbon content well, guarantee the stability of product, guarantee dimensional accuracy of products simultaneously.
Though at present both at home and abroad existing researchers have studied the injection molding technology of carbide alloy, mainly developed that some performance requirements are not high at present, the wearing piece that is used for the ornament materials occasion, structural member etc.But really successfully be used to prepare have the high-performance rigid alloy blade occasion seldom, do not appear in the newspapers.
Summary of the invention:
The present invention overcomes the deficiency of prior powder metallurgy die forming and existing powder injection forming, adopts powder injection forming+solvent degreasing+hot degreasing of step and sintering technology to prepare hard alloy rotatable special-shaped blade.Adopt wax, oil, polyethylene, polypropylene, vinyl-vinyl acetate copolymer, polymethyl methacrylate, poly-formamide, polyacrylonitrile, stearic acid, di-n-octyl phthalate, n-butyl phthalate, multiple in the organic matters such as diisooctyl phthalate, prepare wax+oil+high molecular polymer+low molecules agent multicomponent binding agent, binding agent and the melting of carbide alloy mixed-powder are mixed with the homogeneous feeding, to inject base then and in solvent, carry out solvent degreasing, at last the solvent degreasing base is carried out hot degreasing and sintering in hot degreasing+sintering integrated furnace, reduced operating process, the breakage of aerial secondary oxidation and sample turnover stove process after having avoided sample to come out of the stove, make the control carbon of product true, shape is complete, better controlled the quality of product, the mechanical property of alloy satisfies production requirement, simultaneously the dimensional discrepancy of product control to ± 0.5% in.
For achieving the above object, scheme of the present invention is:
(1) alloying component is WC and Co, and wherein Co content is 6%～15%, and all the other are WC;
(2) adopt multiple in the organic matters such as wax, oil, polyethylene, polypropylene, vinyl-vinyl acetate copolymer, polymethyl methacrylate, poly-formamide, polyacrylonitrile, stearic acid, di-n-octyl phthalate, n-butyl phthalate, diisooctyl phthalate, prepare wax+oil+high molecular polymer+low molecules agent multicomponent binding agent;
(3) prepared binding agent in (2) is taken by weighing certain proportion, heating is up to fusion in mixing roll, and it is even to add WC-Co carbide alloy mixed-powder powerful mixing then, is mixed with the powder useful load and is 47%～60% even feeding;
(4) gained feeding in (3) is obtained rotatable special-shaped blade and bending resistance sample injection base in the injector injection;
(5) the injection base in (4) is immersed in carries out solvent degreasing in the solvent, solvent temperature is 25-40 ℃, and degreasing rate guarantees between 45%～65%;
(6) with carrying out hot degreasing+sintering process of a step through the bending resistance sample after the solvent degreasing and special-shaped blade in (5) be: be raised to 250～360 ℃ of insulation 30～150min from room temperature; be raised to 400～550 ℃ of insulation 30-120min again; again at 1000～1200 ℃ of insulation 10～60min; be raised to 1360～1420 ℃ of insulation 30～120min at last, protective atmosphere is H
2, N
2+ H
2, N
2, Ar, vacuum.
The sample that sintering is come out carries out Performance Detection and dimensional measurement, the dimensional discrepancy of prepared rotatable special-shaped blade product is in 0.3%, the carbide alloy height of the identical component that its bending strength is more prepared than the conventional moulded shaping, size and performance meet the demands fully.
Advantage of the present invention and good effect are embodied in:
(1) solved the technical barrier that common mold pressing can't directly prepare special-shaped blade, mold pressing has reduced following process relatively, has reduced production cost.
(2) binding agent of Cai Yonging has and removes soon, removes the characteristics of noresidue defective, simultaneously, by the control degreasing process, can be good at controlling the carbon content of alloy.
(3) with hot degreasing+sintering integratedization, broken the conventional method that hot degreasing and sintering are carried out separately, reduced operating process, improved production efficiency, the breakage of aerial secondary oxidation and sample turnover stove process after having avoided sample to come out of the stove simultaneously, make the control carbon of product true, shape is kept perfectly.
(4) by changing the mould design, prepare the carbide alloy special-shaped blade of other shape.
The specific embodiment:
Embodiment 1:
(1) take by weighing each binding agent constituent element quality by quality per distribution ratio (is example with the 100g binding agent):
Each constituent element is mixed into the mixture of color homogeneous on banbury, this mixture is used binding agent;
(2) take by weighing 2000g WC-6Co cemented carbide powder and 98.5g binding agent according to powder volume useful load (as 55%), the mixing 2h in banbury with powder and binding agent prepares the feeding that mixes;
(3) feeding is injected indexable special-shaped blade injection base on injector, in injection process, injection temperature is 120 ℃, injection pressure/dwell pressure is 110MPa, and be 2 seconds inject time, and the dwell time is 0.5 second, injection speed (flow) is 50%, and the storing position is 10.00mm;
(4) will inject base and carry out solvent degreasing in industrial naptha, skimming temp is 35 ℃, and degreasing time is 10h;
(5) the solvent degreasing base is carried out hot degreasing and sintering in hot degreasing+sintering integrated furnace, its hot degreasing+sintering process is specially:
(6) sample that sintering is come out carries out mechanical property detection and dimensional accuracy measurement.The dimensional discrepancy of prepared indexable insert tip, throw away tip≤± 0.3%, bending strength are more than the 1900MPa.
Embodiment 2:
(1) take by weighing each binding agent constituent element quality by quality per distribution ratio (is example with the 100g binding agent):
Each constituent element is mixed into the mixture of color homogeneous on banbury, this mixture is used binding agent;
(2) take by weighing 2000g WC-10Co cemented carbide powder and 98.5g binding agent according to powder volume useful load (as 51%), the mixing 1h in banbury with powder and binding agent prepares the feeding that mixes;
(3) feeding is injected indexable special-shaped blade injection base on injector;
(6) will inject base and carry out solvent degreasing in industrial naptha, skimming temp is 26 ℃, and degreasing time is 16h;
(7) the solvent degreasing base is carried out hot degreasing and sintering in hot degreasing+sintering integrated furnace, its hot degreasing+sintering process is specially:
(6) sample that sintering is come out carries out mechanical property detection and dimensional accuracy measurement.The dimensional discrepancy of prepared indexable insert tip, throw away tip≤± 0.3%, bending strength are more than the 2460MPa.
Claims (2)
1. the preparation method of a hard alloy rotatable special-shaped blade is characterized in that:
(1) adopts wax, high molecular polymer, oily and low molecules agent, prepare wax+oil+high molecular polymer+low molecules agent multicomponent binding agent, each constituent element constitutes and the quality percentage composition of each constituent element is: wax is paraffin, beeswax or microwax, account for 50-79% altogether, polyethylene in the high molecular polymer, polypropylene or polystyrene high molecular polymer account for 5-25% altogether, vinyl-vinyl acetate copolymer, polymethyl methacrylate, poly-formamide or polyacrylonitrile copolymer account for 5-15% altogether, oil is vegetable oil or peanut oil, account for 5-15% altogether, low molecules agent is a stearic acid, di-n-octyl phthalate, n-butyl phthalate or diisooctyl phthalate account for 1-5% altogether;
(2) with the binding agent heating of preparation up to fusion, it is even to add WC-Co carbide alloy mixed-powder powerful mixing then, wherein Co content is 6%～15%, all the other are WC, are mixed with the powder useful load and are 47%～60% even feeding;
(3) feeding is obtained rotatable special-shaped blade and bending resistance sample injection base in the injector injection;
(4) will inject base and be immersed in and carry out solvent degreasing in the solvent, solvent temperature is 25-40 ℃, and degreasing rate is between 45%～65%;
(5) will carry out a hot degreasing of step and a sintering through bending resistance sample after the solvent degreasing and special-shaped blade; technology is: be raised to 250～360 ℃ of insulation 30～150min from room temperature; be raised to 400～550 ℃ of insulation 30-120min again; again at 1000～1200 ℃ of insulation 10～60min; be raised to 1360～1420 ℃ of insulation 30～120min at last, protective atmosphere is H
2, N
2+ H
2, N
2, Ar or vacuum.
2. the preparation method of hard alloy rotatable special-shaped blade according to claim 1, it is characterized in that: the solvent degreasing solvent for use is one or more in gasoline, normal heptane, cyclohexane, the chloromethanes, solvent temperature is 25～40 ℃, and degreasing time is 4～20h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100359156A CN100519010C (en) | 2007-10-17 | 2007-10-17 | Method of producing hard alloy rotatable special-shaped blade |
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|---|---|---|---|
| CNB2007100359156A CN100519010C (en) | 2007-10-17 | 2007-10-17 | Method of producing hard alloy rotatable special-shaped blade |
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| CN101134242A CN101134242A (en) | 2008-03-05 |
| CN100519010C true CN100519010C (en) | 2009-07-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107052346A (en) * | 2016-12-28 | 2017-08-18 | 江苏精研科技股份有限公司 | The preparation technology of powder injection forming tungsten-nickel hard alloy |
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| SE533922C2 (en) * | 2008-12-18 | 2011-03-01 | Seco Tools Ab | Ways to manufacture cemented carbide products |
| CN101700615B (en) * | 2009-11-12 | 2012-09-05 | 洪殿 | Method for preparing pliers of butted cutting edges |
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| CN101844227B (en) * | 2010-05-19 | 2012-07-25 | 株洲钻石切削刀具股份有限公司 | Application of adhesive for hard alloy injection molding |
| RU2012155195A (en) * | 2010-05-26 | 2014-07-10 | Секо Тулз Аб | METHOD FOR PRODUCING CEMENTED CARBIDE PRODUCTS |
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| CN107052346A (en) * | 2016-12-28 | 2017-08-18 | 江苏精研科技股份有限公司 | The preparation technology of powder injection forming tungsten-nickel hard alloy |
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