CN114029488A - Method for repairing height dimension of hard alloy blank - Google Patents
Method for repairing height dimension of hard alloy blank Download PDFInfo
- Publication number
- CN114029488A CN114029488A CN202111233704.XA CN202111233704A CN114029488A CN 114029488 A CN114029488 A CN 114029488A CN 202111233704 A CN202111233704 A CN 202111233704A CN 114029488 A CN114029488 A CN 114029488A
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- Prior art keywords
- hard alloy
- alloy blank
- blank
- height dimension
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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
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
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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
- B22F3/005—Loading or unloading powder metal objects
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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
- B22F3/24—After-treatment of workpieces or articles
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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
- B22F3/10—Sintering only
- B22F2003/1042—Sintering only with support for articles to be sintered
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a method for repairing the height and the size of a hard alloy blank, which sequentially comprises the following steps: s1, clamping the upper part of the hard alloy blank by using a graphite ring, and suspending the hard alloy blank; s2, putting the suspended hard alloy blank into a sintering furnace for heating, heating to 1350-1450 ℃ within 3-5 hours, then preserving heat for 1.5-2.5 hours, and cooling to room temperature along with the furnace. The invention has the advantages that: the graphite ring is used for clamping the hard alloy blank, the hard alloy blank is hung and then is re-sintered, the hard alloy blank is elongated due to the influence of self gravity in the sintering process, the size of the hard alloy blank with the length direction being only insufficient by 2-3 mm can be made up, and therefore the problem that the hard alloy blank is directly scrapped is avoided.
Description
Technical Field
The invention relates to a method for repairing the height dimension of a hard alloy blank.
Background
When the hard alloy product is manufactured, a blank is firstly made, then the hard alloy product is formed by sintering, but the volume of the hard alloy product is reduced in the sintering process, so that if the reserved length is not enough, the length of the sintered hard alloy blank is shorter than the actual requirement, some hard alloy blanks are only 2-3 mm shorter than the required size, but the product can only be scrapped, and the scrapped product can not be recycled and sintered, so that the great waste is caused.
Disclosure of Invention
The invention aims to provide a method for repairing the height and the size of a hard alloy blank, which can effectively solve the problem that the existing sintered hard alloy blank can only be scrapped when the length is too short.
In order to solve the technical problems, the invention is realized by the following technical scheme: the method for repairing the height dimension of the hard alloy blank sequentially comprises the following steps:
s1, clamping the upper part of the hard alloy blank by using a graphite ring, and suspending the hard alloy blank;
s2, putting the suspended hard alloy blank into a sintering furnace for heating, raising the temperature to 1350-1450 ℃ at a constant speed within 3-5 hours, then preserving the heat for 1.5-2.5 hours, and cooling to room temperature along with the furnace.
Preferably, the hard alloy blank comprises a cylindrical blank body, the blank body is provided with a through hole along a central axis, the outer circumferential surface of the blank body is provided with a ring groove, and the graphite ring is clamped in the ring groove in the step S1. The design of the ring groove of the blank body is utilized to avoid the graphite clamping damage to the outer side surface of the blank body, and the graphite ring is also favorably fixed.
Preferably, a suspension bracket is arranged below the graphite ring, and the graphite ring is erected on the suspension bracket.
Preferably, the suspension bracket is cylindrical with an upward opening, so that the graphite ring can be effectively supported, and the suspended hard alloy blank can be protected.
Preferably, the hard alloy blank placed into the sintering furnace in the step S2 is uniformly heated to 1400 ℃ within 4 hours, and is cooled to room temperature along with the furnace after being kept warm for 2 hours.
Compared with the prior art, the invention has the advantages that: the graphite ring is used for clamping the hard alloy blank, the hard alloy blank is hung and then is re-sintered, the hard alloy blank is elongated due to the influence of self gravity in the sintering process, the size of the hard alloy blank with the length direction being only insufficient by 2-3 mm can be made up, and therefore the problem that the hard alloy blank is directly scrapped is avoided.
Drawings
Fig. 1 is a schematic structural view of a cemented carbide blank having an insufficient length dimension when suspended.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The method for repairing the height dimension of the hard alloy blank sequentially comprises the following steps:
s1, clamping the upper part of the hard alloy blank by using the graphite ring 1, and suspending the hard alloy blank;
s2, putting the suspended hard alloy blank into a sintering furnace for heating, heating to 1350-1450 ℃ within 3-5 hours, then preserving heat for 1.5-2.5 hours, and cooling to room temperature along with the furnace.
Taking the cemented carbide blank shown in fig. 1 as an example, the cemented carbide blank comprises a cylindrical blank body 2, the blank body 2 is provided with a through hole 3 along the central axis, the outer circumference of the blank body 2 is provided with a ring groove 4, and after sintering of the blank body 2 of the structure, the length is found to be 2mm shorter than the expected size. The solution is as follows: firstly, a graphite ring 1 is manufactured, a hole is formed in the center of the graphite ring 1, the graphite ring 1 is cut into two pieces, then the two pieces are clamped in an annular groove 4 of a blank body 2, the graphite ring 1 is jacked up by utilizing a suspension bracket 5, a hard alloy blank is suspended and then placed into a sintering furnace, the temperature of the hard alloy blank is raised to 1400 ℃ within 4 hours, the temperature is kept for 2 hours and then cooled to room temperature along with the furnace, and the whole blank body 2 is stretched to reach the expected size under the action of the gravity of the hard alloy blank. The method can avoid the hard alloy blank with slightly insufficient size in the length direction, the size in the width direction is used for making up the size in the length direction, and the hard alloy blank extends in the length direction by utilizing the self gravity of the hard alloy blank in the sintering process.
The suspension bracket 5 used in the scheme can be in a cylindrical shape with an upward opening, and also can be in a shape supported by a plurality of vertical supports, as long as the graphite ring 1 clamped with the hard alloy blank can be stably placed on the suspension bracket, and the graphite ring 1 of the two sections can be fixed together through a buckle or a connecting plate and the like, so that the hard alloy blank is prevented from being clamped and then collapsing.
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the technical field of the present invention by those skilled in the art are covered by the claims of the present invention.
Claims (5)
1. The method for repairing the height dimension of the hard alloy blank is characterized by comprising the following steps: the method sequentially comprises the following steps:
s1, clamping the upper part of the hard alloy blank by using the graphite ring (1) and suspending the hard alloy blank;
s2, putting the suspended hard alloy blank into a sintering furnace for heating, heating to 1350-1450 ℃ within 3-5 hours, then preserving heat for 1.5-2.5 hours, and cooling to room temperature along with the furnace.
2. The method for repairing the height dimension of a cemented carbide blank according to claim 1, wherein: hard alloy blank includes columniform idiosome (2), and open through-hole (3) along the central axis in idiosome (2), and open the outer periphery of idiosome (2) has annular (4), graphite ring (1) presss from both sides in annular (4) in step S1.
3. The method for repairing the height dimension of a cemented carbide blank as set forth in claim 1 or 2, wherein: a suspension bracket (5) is arranged below the graphite ring (1), and the graphite ring (1) is erected on the suspension bracket (5).
4. The method of claim 3, wherein the cemented carbide blank height dimension repair method comprises: the suspension bracket (5) is cylindrical with an upward opening.
5. The method for repairing the height dimension of a cemented carbide blank according to claim 1, wherein: and in the step S2, the temperature of the hard alloy blank placed in the sintering furnace is raised to 1400 ℃ within 4 hours, and after the temperature is kept for 2 hours, the hard alloy blank is cooled to room temperature along with the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233704.XA CN114029488B (en) | 2021-10-22 | 2021-10-22 | Repairing method for height and size of hard alloy blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233704.XA CN114029488B (en) | 2021-10-22 | 2021-10-22 | Repairing method for height and size of hard alloy blank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114029488A true CN114029488A (en) | 2022-02-11 |
| CN114029488B CN114029488B (en) | 2023-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111233704.XA Active CN114029488B (en) | 2021-10-22 | 2021-10-22 | Repairing method for height and size of hard alloy blank |
Country Status (1)
| Country | Link |
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| CN (1) | CN114029488B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1237679A (en) * | 1969-12-11 | 1971-06-30 | Vni Instrument Inst | Sintering metal or cemented carbide blanks |
| JP2003041304A (en) * | 2001-07-30 | 2003-02-13 | Nachi Fujikoshi Corp | Method for manufacturing sintered compact of hard alloy |
| CN201855946U (en) * | 2010-10-11 | 2011-06-08 | 成都川硬合金材料有限责任公司 | Sintering device for regenerated WC-Ni hard alloy long and thin spray pipe |
| CN202048791U (en) * | 2011-05-06 | 2011-11-23 | 株洲金鼎硬质合金有限公司 | Boat for sintering hard alloy products |
| DE102016002623A1 (en) * | 2016-03-07 | 2017-09-07 | Premium Aerotec Gmbh | Method and device for producing components with defined dimensions |
| CN109650872A (en) * | 2019-02-20 | 2019-04-19 | 四川大学 | A kind of calcium phosphate porous bioceramic scaffold and preparation method thereof based on free extruded type 3D printing technique |
| CN110666171A (en) * | 2019-12-05 | 2020-01-10 | 中国航发上海商用航空发动机制造有限责任公司 | Model correction method for circular hole structure formed by selective laser melting |
| CN110666174A (en) * | 2019-10-23 | 2020-01-10 | 航天材料及工艺研究所 | Method for improving end face buckling deformation of hot isostatic pressing powder metallurgy flat component |
| CN110795886A (en) * | 2020-01-06 | 2020-02-14 | 中国航发上海商用航空发动机制造有限责任公司 | Method for determining dimensional allowance, method for forming dimensional allowance, forming device, and readable storage medium |
| CN211386897U (en) * | 2019-12-23 | 2020-09-01 | 成都金钨硬质合金有限公司 | Vacuum sintering and boat loading device for hard alloy special-shaped pipes |
-
2021
- 2021-10-22 CN CN202111233704.XA patent/CN114029488B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1237679A (en) * | 1969-12-11 | 1971-06-30 | Vni Instrument Inst | Sintering metal or cemented carbide blanks |
| JP2003041304A (en) * | 2001-07-30 | 2003-02-13 | Nachi Fujikoshi Corp | Method for manufacturing sintered compact of hard alloy |
| CN201855946U (en) * | 2010-10-11 | 2011-06-08 | 成都川硬合金材料有限责任公司 | Sintering device for regenerated WC-Ni hard alloy long and thin spray pipe |
| CN202048791U (en) * | 2011-05-06 | 2011-11-23 | 株洲金鼎硬质合金有限公司 | Boat for sintering hard alloy products |
| DE102016002623A1 (en) * | 2016-03-07 | 2017-09-07 | Premium Aerotec Gmbh | Method and device for producing components with defined dimensions |
| CN109650872A (en) * | 2019-02-20 | 2019-04-19 | 四川大学 | A kind of calcium phosphate porous bioceramic scaffold and preparation method thereof based on free extruded type 3D printing technique |
| CN110666174A (en) * | 2019-10-23 | 2020-01-10 | 航天材料及工艺研究所 | Method for improving end face buckling deformation of hot isostatic pressing powder metallurgy flat component |
| CN110666171A (en) * | 2019-12-05 | 2020-01-10 | 中国航发上海商用航空发动机制造有限责任公司 | Model correction method for circular hole structure formed by selective laser melting |
| CN211386897U (en) * | 2019-12-23 | 2020-09-01 | 成都金钨硬质合金有限公司 | Vacuum sintering and boat loading device for hard alloy special-shaped pipes |
| CN110795886A (en) * | 2020-01-06 | 2020-02-14 | 中国航发上海商用航空发动机制造有限责任公司 | Method for determining dimensional allowance, method for forming dimensional allowance, forming device, and readable storage medium |
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| Publication number | Publication date |
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| CN114029488B (en) | 2023-08-22 |
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