CN102747242B - Method for preparing large-size hard alloy - Google Patents
Method for preparing large-size hard alloy Download PDFInfo
- Publication number
- CN102747242B CN102747242B CN201210261022.4A CN201210261022A CN102747242B CN 102747242 B CN102747242 B CN 102747242B CN 201210261022 A CN201210261022 A CN 201210261022A CN 102747242 B CN102747242 B CN 102747242B
- Authority
- CN
- China
- Prior art keywords
- wimet
- vacuum sintering
- work
- hard alloy
- sections
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention provides a method for preparing large-size hard alloy, which comprises the following steps of: (S1) preparing several segments of small-size hard alloy blanks by using a compression molding method; (S2) performing first vacuum sintering on each hard alloy blank to obtain a semi-finished hard alloy product; (S3) flat grinding the end face of each semi-finished hard alloy product, and successively butting the end faces; and (S4) performing second vacuum sintering on the several segments of entire butted semi-finished hard alloy products to obtain the finished large-size hard alloy product, wherein the highest temperature of second vacuum sintering is 1400-1420 DEG C, the heating speed in the second vacuum sintering process is 3-7 DEG C/min, and the temperature is maintained for 45-80 min after a liquid phase occurs during the second vacuum sintering process. The invention overcomes the limitation that the large-size hard alloy product can only be produced by isostatic pressing in the prior art. Compared with the isostatic pressing production method, the method provided by the invention has greatly reduced cost and greatly shortened production period, and the grinding amount of the product is small.
Description
Technical field
The present invention relates to Wimet and prepare field, be specifically related to a kind of preparation method of Large scale alloy.
Background technology
At present, for the hart metal product that length is large, volume is larger, the consistent method adopting is that isostatic pressing production, vacuum sintering obtain both at home and abroad.When isostatic pressing is produced, have following shortcoming: 1, product mold fabrication cycle is longer, a set of isostatic tooling needs 15 to 20 days from being fabricated into trial production; 2, Die price costliness, the price of a set of isostatic tooling is generally more than 6000 yuan; 3, life cycle of the product is long.Therefore, isostatic pressing method of the prior art is general is only applied in the time that typical products in mass production is produced.
And for the less Large scale alloy product of quantity on order, for example valve series hard alloy product, if adopt isostatic pressing to produce, cost is higher and the delivery cycle is longer, can not meet customer need.For example length is greater than the valve series hard alloy product of 150mm, from Mold Making to finished product, processes, and need more than 35 days could deliver goods, and its stock removal is more than 50% when employing isostatic pressing method, and Mold Making expense is in addition higher, causes production cost high.
Common press moulding mode is difficult to produce larger-size hart metal product, mainly has a following difficult problem: (one) press stroke and pressure are inadequate; (2) because product length is larger, when compacting, each several part density difference is very large, has great distortion when product sintering; (3) because product length is larger, product formation liquid phase when vacuum sintering, can cause product flexural deformation, even if be also difficult to guarantee to obtain the product of desired shape size by reprocessing.
Summary of the invention
The present invention is that the cost that in solution prior art, isostatic pressing production Large scale alloy product exists is high, life cycle of the product long and can not guarantee shape of product size, and common press moulding mode can not prepare the technical problem of Large scale alloy product, the invention provides that a kind of low production cost, production cycle significantly shorten, the preparation method of the simple Large scale alloy of technique.
Technical scheme of the present invention is:
A preparation method for Large scale alloy, comprises the following steps:
S1, first adopt compression-moulding methods to prepare some sections of undersized Wimet blanks;
S2, each Wimet blank is carried out to a vacuum sintering, obtain respectively some sections of Wimet work in-process;
S3, the each section of half-finished end face of Wimet carried out to plain grinding, then each section of Wimet work in-process are docked successively through the end face of plain grinding, when docking, make that two sections of adjacent Wimet work in-process are set level completely, seamless contact between adjacent two end faces;
S4, by docking after some sections of Wimet work in-process entirety carry out secondary vacuum sintering, obtain Large scale alloy finished product; Wherein, the top temperature of secondary vacuum sintering is 1400-1420 ℃, and the temperature rise rate in secondary vacuum sintering process is 3-7 ℃/min, occurs being incubated 45-80min after liquid phase in secondary vacuum sintering process.
The preparation method of Large scale alloy provided by the invention, first prepare some sections of small size Wimet work in-process by common compression molding, then it is docked successively, in the time of secondary vacuum sintering, between work in-process, still can be bonded together by Binder Phase, (comprise sintering temperature by the concrete sintering condition to secondary vacuum sintering, temperature rise rate and soaking time) suitably select, guarantee that two sections of half-finished bonding surfaces of Wimet adjacent after secondary vacuum sintering are basically identical with normal crystalline phase microstructure in crystalline phase microstructure, thereby obtain large-sized hard alloy finished product, overcome the restriction that in prior art, Large scale alloy product can only be produced by isostatic pressing, and with respect to isostatic pressing production method, method production cost provided by the invention reduces greatly, production cycle shortens greatly, and product stock removal is little, save man-hour and raw material.
Embodiment
The preparation method who the invention provides a kind of Large scale alloy, comprises the following steps:
S1, first adopt compression-moulding methods to prepare some sections of undersized Wimet blanks;
S2, each Wimet blank is carried out to a vacuum sintering, obtain respectively some sections of Wimet work in-process;
S3, the each section of half-finished end face of Wimet carried out to plain grinding, then each section of Wimet work in-process are docked successively through the end face of plain grinding, when docking, make that two sections of adjacent Wimet work in-process are set level completely, seamless contact between adjacent two end faces;
S4, by docking after some sections of Wimet work in-process entirety carry out secondary vacuum sintering, obtain Large scale alloy finished product; Wherein, the top temperature of secondary vacuum sintering is 1400-1420 ℃, and the temperature rise rate in secondary vacuum sintering process is 3-7 ℃/min, occurs being incubated 45-80min after liquid phase in secondary vacuum sintering process.
The preparation method of Large scale alloy provided by the invention, first prepare some sections of small size Wimet work in-process by common compression molding, then it is docked successively, in the time of secondary vacuum sintering, between work in-process, still can be bonded together by Binder Phase, (comprise sintering temperature by the concrete sintering condition to secondary vacuum sintering, temperature rise rate and soaking time) suitably select, guarantee that two sections of half-finished bonding surfaces of Wimet adjacent after secondary vacuum sintering are consistent with normal crystalline phase microstructure in crystalline phase microstructure, thereby obtain large-sized hard alloy finished product, overcome the restriction that in prior art, Large scale alloy product can only be produced by isostatic pressing, and with respect to isostatic pressing production method, method production cost provided by the invention reduces greatly, production cycle shortens greatly, and product stock removal is little, save man-hour and raw material.
In the present invention, in step S1, when Wimet blank is prepared in compression molding, compacting height should be controlled well, suppress the highly too high distortion that easily produces, and suppresses the highly too short whole product institute segments that makes too many, brings difficulty to secondary vacuum sintering.In the present invention, the highly definite principle of compacting is: in the time guaranteeing pressed compact through vacuum sintering for the first time, do not produce under the prerequisite of distortion, and more high better.The present inventor finds by great many of experiments: the compacting height of Wimet blank is greater than at 2 o'clock with the ratio of external diameter, when product sintering, is easily out of shape; Therefore, in the present invention, the compacting height of Wimet blank and ratio≤2 of external diameter.In addition, according to the cobalt contents difference of the wall thickness of product and material used, compacting highly also can be carried out accommodation, and the present invention is not particularly limited.
In the present invention, compression molding is prepared the quantity of undersized Wimet blank and can suitably be selected according to the concrete size of the required Large scale alloy product of reality.For example, when the final height dimension of hard alloy finished product is 240mm, external diameter while being 50mm, can first compression molding prepare the Wimet blank that three sections of height are 80-82mm, but be not limited to this.
In the present invention, compression molding is prepared undersized Wimet blank and Wimet blank is carried out to the ordinary method that the method for a vacuum sintering is those skilled in the art, and the present invention does not have special stipulation.Be the condition of compression molding and a vacuum sintering in the normal ranges of this area, specifically can suitably select according to the concrete composition of selected Wimet.Under preferable case, in step S2, the top temperature of a vacuum sintering is 1350-1410 ℃, and the temperature rise rate in once sintered process is 3-7 ℃/min, in a vacuum sintering process, be incubated 150-250min 320-540 ℃ time, 1350-1410 ℃ time, be incubated 60-90 min.In step S2, after a vacuum sintering, the Wimet work in-process that obtain have enough process redundancy, have guaranteed can obtain by following process after secondary vacuum sintering the product of client's desired shape size.
In the present invention, thereby the object that the each section of half-finished end face of Wimet carried out to plain grinding is can realize slitless connection by complete matching while guaranteeing follow-up docking.Under preferable case, the each section of half-finished end face of Wimet carried out after plain grinding, roughness is 0.8-6.4.When roughness < 0.8, after product docking due to the relative slippage of the too little easy generation of frictional force, thereby product concentricity after double sintering can not be met the demands; When thick original text degree > 6.4, can not guarantee work in-process slitless connection.Two sections of Wimet work in-process in end positions when docking when docking only one of them end face for contacting with adjacent Wimet work in-process, therefore as a kind of preferred implementation of the present invention, in step S3, two sections of Wimet work in-process that lay respectively at end positions when docking only need a plain grinding one end face in the time of plain grinding, and all need to process two end faces when all the other Wimet work in-process plain grindings.
As a kind of preferred implementation of the present invention, in step S3, when product docking, can between two adjacent contact end faces, fill a certain amount of additive, this additive can be cobalt powder, also can be cobalt powder, nickel powder with the mixed uniformly mixture of certain proportioning, or other single kinds or the mixture of multiple matrix metal powder.In the time that product is carried out to vacuum sintering for the second time, when temperature reaches after 1300 ℃, described additive slowly forms liquid phase, under gravity and capillary force, part liquid phase penetrates in adjacent two-section product, thereby more piece product can be connected more closely, reach with isostatic pressing produce, the homomorphosis after normal sintering, large-sized hard alloy finished product of the basic indifference of performance.
As previously mentioned, the present inventor finds by great many of experiments, in the present invention, after the Wimet work in-process docking of segmentation, can be by controlling the condition of secondary vacuum sintering, guarantee that two sections of half-finished bonding surfaces of Wimet adjacent after secondary vacuum sintering are basically identical with normal crystalline phase microstructure in crystalline phase microstructure, thereby make between adjacent Wimet work in-process, due to the liquid phase impact that gravity, Binder Phase form, can make bonding surface be firmly bonded to together.
In the present invention, if described Wimet work in-process are cylindrical or center has the cylindrical of through hole, during for the docking of assurance Wimet, can realize seamless contact, when each section of Wimet work in-process dock in step S3, be required to be concentric docking.For example, in the time that described Wimet is used for valve series products, its blank preparing by compression molding has the cylindrical of through hole.
Under preferable case, in the time carrying out vacuum sintering for the second time, can place the graphite core that ovality is less than 0.2 in the central position in the central through hole of product, and when this graphite core periphery need to be coated with one or more layers sintering, anti-boat sticking coating also dries in the shade naturally, the external diameter of the graphite core after drying in the shade should equate with the endoporus of required alloy finished product, highly wants the alloy work in-process after a little higher than docking.Product produces contraction after vacuum sintering for the second time, can tightly bind round on graphite core.Substantially there is no ellipse because the ovality of graphite core is less than 0.2(), the product endoporus ellipse that makes tightly to bind round on graphite core also can be less.Therefore when, placing graphite core can effectively be avoided product sintering, there is the situation of ovalizing deflection.
Preparation in accordance with the present invention, after secondary vacuum sintering completes, also can proceed ground finish to sintered products as required, thereby is met the fine work of customer requirement.For example, the performance requriements of valve series hard alloy is not high, and being mainly wear-resisting, corrosion-resistant, high pressure resistant, general Wimet can reach; Even through secondary vacuum sintering, still guarantee to reach the performance requriements of product.Adopt preparation method provided by the invention, can be applicable to the production of valve hart metal product.
With respect to isostatic pressing production method, preparation method provided by the invention has the following advantages: 1, die cost is saved 100-200% on year-on-year basis, has greatly cut down die cost; 2, product stock removal is below 15%, and the utmost point has reduced production cost effectively; 3,, from die sinking to delivery, only need about 17 days, the life cycle of the product reducing by more than half.
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1
Producing is highly 240mm, and external diameter is 50mm, the hard alloy finished product nozzle S1 that endoporus is 30mm.Preparing 3 sections of compactings by the normal production technique compression molding of Wimet is highly that 100.5mm, pressed compact external diameter are the cylindrical Wimet blank that center that 62.5mm, compact inner holes are 37.5mm has through hole; Then in vacuum sintering furnace, top temperature is at 1370 ℃, to carry out a vacuum sintering respectively, and its temperature rise rate is 3 ℃/min, is incubated 150min 320-540 ℃ time, 1350-1370 ℃ time, is incubated 60min, obtains the Wimet work in-process that 3 sections of height are 81mm.Then incite somebody to action wherein 2 sections of Wimet work in-process I, an end face plain grinding of III, two end faces of other 1 section of Wimet work in-process II all carry out plain grinding, to surface roughness be 3.2, then according to I, II, the order of III is alignd three sections of Wimet work in-process with one heart, make the seamless contact of end face after plain grinding, between two contact surfaces, add respectively the pure cobalt powder of one deck, and entirety is put into vacuum sintering furnace, top temperature is at 1400 ℃, to carry out secondary vacuum sintering, its temperature rise rate is 4 ℃/min, occur being incubated 45min after liquid phase, cooling rear according to the ground finish of necessary requirement process, obtain the highly hard alloy finished product nozzle S1 for 240mm.
Embodiment 2
Producing is highly 180mm, and external diameter is 65mm, the hard alloy finished product nozzle S2 that endoporus is 30mm
Preparing 2 sections of compactings by the normal production technique compression molding of Wimet is highly that 113mm, pressed compact external diameter are the cylindrical Wimet blank that center that 81.25mm, compact inner holes are 37.5mm has through hole, then in vacuum sintering furnace, top temperature is at 1410 ℃, to carry out a vacuum sintering respectively, its temperature rise rate is 5 ℃/min, 320-540 ℃ time, be incubated 250min, 1350-1410 ℃ time, be incubated 90min, obtain the Wimet work in-process that 2 sections of height are 91mm.Then by 2 sections of Wimet work in-process I, an end face of II carries out plain grinding, to surface roughness be 4.0, then by these two sections of Wimet I, II work in-process align with one heart, make the seamless contact of end face after plain grinding, between two contact surfaces, add one deck additive, the composition of additive is the cobalt powder of 70wt% and the nickel powder of 30wt%, and place and scribble the graphite core of 2 coatings in work in-process central position, graphite core external diameter is 29mm, be highly 230mm, entirety is put into vacuum sintering furnace, top temperature is at 1420 ℃, to carry out secondary vacuum sintering, its temperature rise rate is 7 ℃/min, occur being incubated 60min after liquid phase, cooling rear according to the ground finish of necessary requirement process, obtain the highly hard alloy finished product nozzle S2 for 180mm.
Embodiment 3
Producing is highly 270mm, and external diameter is 35mm, the hard alloy finished product nozzle S3 that endoporus is 20mm.Preparing 4 sections of compactings by the normal production technique compression molding of Wimet is highly that 85mm, pressed compact external diameter are the cylindrical Wimet blank that center that 43.75mm, compact inner holes are 25mm has through hole, then in vacuum sintering furnace, top temperature is at 1380 ℃, to carry out a vacuum sintering respectively, its temperature rise rate is 6 ℃/min, 320-540 ℃ time, be incubated 180min, 1350-1380 ℃ time, be incubated 75min, obtain the Wimet work in-process that 4 sections of height are 68.5mm.Then incite somebody to action wherein 2 sections of Wimet work in-process I, an end face plain grinding of IV, other 2 sections of Wimet work in-process II, two end faces of III all carry out plain grinding, to surface roughness be 1.6, then according to I, II, III, the order of IV is alignd four sections of Wimet work in-process with one heart, make the seamless contact of end face after plain grinding, between three contact surfaces, add respectively one deck additive, the composition of additive is the cobalt powder of 80wt% and the nickel powder of 20wt%, and entirety is put into vacuum sintering furnace, top temperature is at 1415 ℃, to carry out secondary vacuum sintering, its temperature rise rate is 7 ℃/min, occur being incubated 50min after liquid phase, cooling rear according to the ground finish of necessary requirement process, obtain the highly hard alloy finished product nozzle S3 for 270mm.
Embodiment 4
Producing is highly 150mm, and external diameter is 70mm, the hard alloy finished product valve series products S4 that endoporus is 40mm.Preparing 2 sections of compactings by the normal production technique compression molding of Wimet is highly that 96mm, pressed compact external diameter are the cylindrical Wimet blank that center that 89mm, compact inner holes are 49mm has through hole, then in vacuum sintering furnace, top temperature is at 1380 ℃, to carry out a vacuum sintering respectively, its temperature rise rate is 4 ℃/min, 320-540 ℃ time, be incubated 120min, 1350-1380 ℃ time, be incubated 75min, obtain the Wimet work in-process that 2 sections of height are 76mm, then by 2 sections of Wimet work in-process I, an end face of II carries out plain grinding, to surface roughness be 6.4, then by these two sections of Wimet I, II work in-process align with one heart, make the seamless contact of end face after plain grinding, and place and scribble the graphite core of 2 coatings in work in-process central position, graphite core external diameter is 39mm, be highly 200mm, entirety is put into vacuum sintering furnace, top temperature is at 1200 ℃, to carry out secondary vacuum sintering, its temperature rise rate is 5 ℃/min, occur being incubated 60min after liquid phase, cooling rear according to the ground finish of necessary requirement process, obtain the highly hard alloy finished product valve series products S4 for 150mm.
Comparative example 1
Adopt isostatic pressing method to produce 240mm, external diameter is 50mm, and the center that endoporus is 30mm has the cylindrical hard alloy finished product DS1 of through hole.
Performance test
1, record the life cycle of the product in embodiment 1-4 and comparative example 1.
2, record the products production cost in embodiment 1-4 and comparative example 1.
3, estimate each hard alloy finished product S1-S3 and DS1 and whether occur bending and deformation, if without being designated as OK, otherwise be designated as NG.
4, test the work-ing life of each hard alloy finished product S1-S3 and DS1, reach 10,000 hours and be designated as OK, otherwise be designated as NG.
Test result is as shown in table 1.
Table 1
| Product | Production cycle (my god) | Production cost (unit) | Deformation of products situation | Work-ing life |
| S1 | 17 | 7500 | OK | OK |
| S2 | 16 | 6800 | OK | OK |
| S3 | 17 | 8400 | OK | OK |
| S4 | 18 | 8300 | OK | OK |
| DS1 | 35 | 15000 | OK | OK |
Can find out from the test result of upper table 1, the Large scale alloy product S1-S4 that adopts preparation method provided by the invention to obtain, the product DS1 obtaining with isostatic pressing generation method has identical form, and can reach work-ing life more than 10,000 hours, can meet customer requirement, but preparation method provided by the invention shortens the production cycle greatly, and cost reduces greatly.
Above embodiment is only the preferred embodiment of the present invention, it should be pointed out that to those skilled in the art, and under the premise without departing from the principles of the invention, some improvement of having done, also should be considered as protection scope of the present invention.
Claims (3)
1. a preparation method for Large scale alloy, is characterized in that, comprises the following steps:
S1, first adopt compression-moulding methods to prepare some sections of undersized Wimet blanks; The compacting height of the Wimet blank that compression molding prepares and ratio≤2 of external diameter;
S2, each Wimet blank is carried out to a vacuum sintering, obtain respectively some sections of Wimet work in-process; Centered by described Wimet work in-process, there is the cylindrical of through hole, the top temperature of a vacuum sintering is 1350-1410 ℃, temperature rise rate in once sintered process is 3-7 ℃/min, in a vacuum sintering process, be incubated 150-250min 320-540 ℃ time, 1350-1410 ℃ time, be incubated 60-90 min;
S3, the each section of half-finished end face of Wimet carried out to plain grinding, the roughness after plain grinding is 0.8-6.4; Then each section of Wimet work in-process are docked successively through the end face of plain grinding, when docking, make seamless contact between two sections of adjacent Wimet work in-process complete matchings, adjacent two end faces; It when each section of Wimet work in-process docking, is docking with one heart;
The graphite core that ovality is less than 0.2 is placed in central position in S4, some sections of Wimet work in-process central through holes after docking; The periphery of described graphite core is coated with anti-boat sticking coating; Some sections of Wimet work in-process entirety after docking are carried out to secondary vacuum sintering, obtain Large scale alloy finished product; Wherein, the top temperature of secondary vacuum sintering is 1400-1420 ℃, and the temperature rise rate in secondary vacuum sintering process is 3-7 ℃/min, occurs being incubated 45-80min after liquid phase in secondary vacuum sintering process;
In step S3, before docking, be also included in the step that applies additive on two adjacent contact end faces; Described additive is selected from the mixture of cobalt powder or cobalt powder and nickel powder.
2. preparation method according to claim 1, it is characterized in that, in step S3, two sections of Wimet work in-process that lay respectively at end positions when docking only need a plain grinding one end face in the time of plain grinding, all need two end faces of plain grinding when all the other Wimet work in-process plain grindings.
3. preparation method according to claim 1 and 2, is characterized in that, also comprises the step of after secondary vacuum sintering completes, sintered products being carried out to ground finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210261022.4A CN102747242B (en) | 2012-07-26 | 2012-07-26 | Method for preparing large-size hard alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210261022.4A CN102747242B (en) | 2012-07-26 | 2012-07-26 | Method for preparing large-size hard alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102747242A CN102747242A (en) | 2012-10-24 |
| CN102747242B true CN102747242B (en) | 2014-05-14 |
Family
ID=47027729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210261022.4A Expired - Fee Related CN102747242B (en) | 2012-07-26 | 2012-07-26 | Method for preparing large-size hard alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102747242B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103990907A (en) * | 2014-04-14 | 2014-08-20 | 河源普益硬质合金厂有限公司 | High-temperature vacuum hard alloy welding method |
| CN104439254A (en) * | 2014-10-31 | 2015-03-25 | 浙江恒成硬质合金有限公司 | Large scale hard alloy butting joint process |
| CN105170975A (en) * | 2015-09-29 | 2015-12-23 | 浙江恒成硬质合金有限公司 | Butt joint method for long powder metallurgy compressed billets |
| CN106180705A (en) * | 2016-07-08 | 2016-12-07 | 中铝广西有色金源稀土有限公司 | A kind of method for preparing powder metallurgy |
| CN106222475B (en) * | 2016-08-29 | 2017-12-29 | 河源富马硬质合金股份有限公司 | A kind of preparation method of Large scale alloy |
| CN108326291A (en) * | 2018-04-27 | 2018-07-27 | 西南应用磁学研究所 | A kind of preparation method of large scale material |
| CN109079146A (en) * | 2018-08-29 | 2018-12-25 | 株洲硬质合金集团有限公司 | A kind of preparation method of hard alloy long cylinder |
| CN109692962A (en) * | 2018-12-29 | 2019-04-30 | 武汉新锐合金工具有限公司 | A kind of hard alloy thin-wall part production technology |
| CN111215631B (en) * | 2020-03-16 | 2020-12-25 | 济南市冶金科学研究所有限责任公司 | Tungsten-cobalt hard alloy product thermal connection method |
| CN114029491B (en) * | 2021-10-22 | 2023-08-01 | 浙江恒成硬质合金有限公司 | Method for repairing inner hole of hard alloy blank |
| CN115837465B (en) * | 2022-12-13 | 2023-06-02 | 长沙华信合金机电有限公司 | Method for eliminating stress of sintered cemented carbide |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381834A (en) * | 2008-10-21 | 2009-03-11 | 株洲力洲硬质合金有限公司 | Double crystal corrosion resistant cemented carbide material and manufacturing method thereof |
| CN202284668U (en) * | 2011-09-30 | 2012-06-27 | 株洲西迪硬质合金科技有限公司 | Hard alloy valve cover |
| CN102560482B (en) * | 2012-03-05 | 2013-09-18 | 株洲精工硬质合金有限公司 | Method of forming composite coating on surface of hard alloy |
-
2012
- 2012-07-26 CN CN201210261022.4A patent/CN102747242B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102747242A (en) | 2012-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102747242B (en) | Method for preparing large-size hard alloy | |
| CN107552629B (en) | A kind of multistage depth cylinder depth circular cone combinatorial surface housing part spin forming method | |
| CN108817194B (en) | Hydraulic preparation method of multi-elbow pipe | |
| CN102159337A (en) | Multi-layer tube using high-pressure tube-hydroforming and manufacturing method thereof | |
| CN104176911A (en) | Efficient non-isothermal compression molding device and method of ultra-precision glass lens | |
| CN101590626B (en) | Bamboo ceramic grinding wheel, preparation method and application thereof | |
| Nakagawa | Advances in prototype and low volume sheet forming and tooling | |
| CN101934504A (en) | Novel ceramic bond cubic boron nitride grinding disc and production method thereof | |
| CN109014212A (en) | A kind of processing method of metal injection molding technology production 5G communication isolator | |
| CN102554023B (en) | Pipe local reducing method | |
| CN107236890A (en) | A kind of concrete pump truck cheater plate and cut ring new material and preparation method thereof | |
| CN103342037A (en) | Production method for improving roughness of one surface of reinforcement plate | |
| CN105215131A (en) | A kind of composite bimetal pipe liquid rises to be shaped and entirely clasps device | |
| CN109226772B (en) | Thermal shaping method of high-yield-strength powder metallurgy product | |
| CN102744690A (en) | 120m/s superspeed high-temperature hot-pressing polishing grinding wheel for stainless steel plate blank and production process thereof | |
| JP6423363B2 (en) | Polishing glass optical element blank molding die, polishing glass optical element blank manufacturing method, and optical element manufacturing method | |
| CN110666174A (en) | Method for improving end face buckling deformation of hot isostatic pressing powder metallurgy flat component | |
| CN102114519A (en) | Method for performing wheel of train | |
| CN101579827A (en) | Method for tooling large-diameter rubber-plastic sealing semi-finished product on vertical lathe | |
| WO2018068372A1 (en) | Powder metallurgy sintering method for non-magnetic steel structural component | |
| CN106583592A (en) | Preparation method of high-elasticity spiral retainer ring | |
| CN103009271A (en) | One side tapered diamond resin grinding wheel and production process thereof | |
| CN103658290B (en) | Based on sheet metal part local deformation adjusting device and the control method of drawing | |
| CN110732597B (en) | Manufacturing process for producing stamping type die | |
| CN104960130A (en) | Precise hot press molding mold for small-opening-diameter aspheric-surface glass lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140514 Termination date: 20180726 |