CN114029491B - Method for repairing inner hole of hard alloy blank - Google Patents
Method for repairing inner hole of hard alloy blank Download PDFInfo
- Publication number
- CN114029491B CN114029491B CN202111233710.5A CN202111233710A CN114029491B CN 114029491 B CN114029491 B CN 114029491B CN 202111233710 A CN202111233710 A CN 202111233710A CN 114029491 B CN114029491 B CN 114029491B
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- Prior art keywords
- hard alloy
- alloy blank
- inner hole
- core
- repairing
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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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
- B22F3/24—After-treatment of workpieces or articles
-
- 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
Abstract
The invention discloses a method for repairing an inner hole of a hard alloy blank, which is used for repairing an inner hole of a hard alloy blank with a larger size, and comprises the following steps: s1, trimming an inner hole of a hard alloy blank into a round table shape; s2, manufacturing a truncated cone-shaped repair ring, putting the repair ring into the inner hole, and enabling two ends of the repair ring to exceed the hard alloy blank by 2-3 mm; s3, placing a graphite core in the repair ring, and applying pressure to the graphite core to enable the repair ring to be tightly attached to the inner wall of the inner hole; s4, placing the hard alloy blank inserted with the repair ring and the graphite core in the S3 into a sintering furnace for sintering; and S5, taking out the graphite core after sintering, and processing the inner hole. The repair ring is added in the inner hole with the size larger than the design size, and the inner hole is sintered again, so that the repair ring and the hard alloy blank are integrated.
Description
Technical Field
The invention relates to a method for repairing an inner hole of a hard alloy blank.
Background
Many hard alloy products are provided with inner holes, when blanks are manufactured, the inner holes are firstly manufactured, and the sizes of the inner holes are only slightly smaller than the actual inner hole sizes, so that when the blanks are sintered, the products meeting the size requirements can be obtained although the sizes of the blanks are changed. However, because the size change during sintering is in a range, sometimes the size of the inner hole of the sintered hard alloy is larger than the design size, so that the product can only be scrapped, and great loss is caused to enterprises.
Disclosure of Invention
The invention aims to provide a method for repairing an inner hole of a hard alloy blank, which can effectively solve the problem that the existing hard alloy inner hole is too large to be scrapped after sintering.
In order to solve the technical problems, the invention is realized by the following technical scheme: the method for repairing the inner hole of the hard alloy blank, which is used for repairing the inner hole of the hard alloy blank with larger size, comprises the following steps:
s1, trimming an inner hole of a hard alloy blank into a round table shape;
s2, manufacturing a truncated cone-shaped repair ring matched with the inner hole of the hard alloy blank, placing the repair ring into the inner hole, wherein the two ends of the repair ring exceed the hard alloy blank by 2-3 mm, and the components of the repair ring are identical to those of the hard alloy blank;
s3, placing a graphite core in the repair ring, and applying pressure to the graphite core to enable the repair ring to be tightly attached to the inner wall of the inner hole;
s4, placing the hard alloy blank inserted with the repair ring and the graphite core in the S3 into a sintering furnace for sintering;
and S5, after sintering, taking out the graphite core, combining the repair ring and the hard alloy blank into a whole, and then processing the inner hole.
Preferably, in the step S1, the inner hole of the cemented carbide blank is trimmed into a truncated cone shape, and the included angle between the bus and the axis is 1.5-3 °
Preferably, the repairing ring is provided with a pressurizing hole along the axial direction, the graphite core is placed in the pressurizing hole, and the pressurizing hole is a straight hole.
Preferably, the graphite core comprises a core sleeve and a core body, the core sleeve is cylindrical, a round table-shaped core hole is formed along the axis of the core sleeve, the core body is also round table-shaped, the core body is inserted into the core hole, and the core sleeve is formed by splicing at least two core blocks.
Preferably, the wall thickness of the repair ring is 8-10 mm.
Preferably, in the step S3, both ends of the graphite core exceed the repair ring by 5-10 mm.
Preferably, the sintering step in the step S4 is as follows: placing the hard alloy blank inserted with the repair ring and the graphite core into a sintering furnace, heating to 1350-1450 ℃ within 3-5 hours, then preserving heat for 1.5-2.5 hours, and then cooling to room temperature along with the furnace
Preferably, the hard alloy blank placed in the sintering furnace is heated to 1400 ℃ within 4 hours, and is cooled to room temperature along with the furnace after being kept for 2 hours.
Compared with the prior art, the invention has the advantages that: the repair ring is added into the inner hole with the size larger than the design size, and the repair ring and the hard alloy blank are sintered again, so that the repair ring and the hard alloy blank are fused together, the graphite core is utilized to apply external tension to the repair ring in the sintering process, the repair ring is always clung to the inner hole of the hard alloy blank, good repair cloth effect is ensured, meanwhile, when the repair ring is put in, both ends of the repair ring exceed the hard alloy blank by 2-3 mm, enough shrinkage of the repair ring in sintering is ensured, repair failure caused by shrinkage of the repair ring into the inner hole after sintering is prevented, and the method is simple to implement and easy to operate, and can well repair the hard alloy blank with smaller inner hole size deviation.
Drawings
FIG. 1 is a schematic diagram of the structure of a combination of a cemented carbide blank, a repair ring and a graphite core in the method for repairing an inner hole of a cemented carbide blank according to the present invention.
Detailed Description
The method for repairing the inner hole of the hard alloy blank, which is used for repairing the inner hole of the hard alloy blank with larger size, comprises the following steps:
s1, trimming an inner hole of a hard alloy blank into a round table shape;
s2, manufacturing a truncated cone-shaped repair ring matched with the inner hole of the hard alloy blank, placing the repair ring into the inner hole, wherein the two ends of the repair ring exceed the hard alloy blank by 2-3 mm, and the components of the repair ring are identical to those of the hard alloy blank;
s3, placing a graphite core in the repair ring, and applying pressure to the graphite core to enable the repair ring to be tightly attached to the inner wall of the inner hole;
s4, placing the hard alloy blank inserted with the repair ring and the graphite core in the S3 into a sintering furnace for sintering;
and S5, after sintering, taking out the graphite core, combining the repair ring and the hard alloy blank into a whole, and then processing the inner hole.
The repair ring is added into the inner hole with the size larger than the design size, and the repair ring and the hard alloy blank are sintered again, so that the repair ring and the hard alloy blank are fused together, the graphite core is utilized to apply external tension to the repair ring in the sintering process, the repair ring is always clung to the inner hole of the hard alloy blank, good repair cloth effect is ensured, meanwhile, when the repair ring is put in, both ends of the repair ring exceed the hard alloy blank by 2-3 mm, enough shrinkage of the repair ring in sintering is ensured, repair failure caused by shrinkage of the repair ring into the inner hole after sintering is prevented, and the method is simple to implement and easy to operate, and can well repair the hard alloy blank with smaller inner hole size deviation.
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 by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1, an embodiment of a method for repairing an inner hole of a cemented carbide blank according to the present invention is used for repairing an inner hole of a cemented carbide blank 1 with a larger size, and comprises the following steps:
s1, trimming an inner hole of a hard alloy blank 1 into a truncated cone shape, wherein an included angle between a bus and an axis of the truncated cone-shaped inner hole is 1.5-3 degrees, and simultaneously, the larger end of the inner hole is upwards and the smaller end is downwards;
s2, manufacturing a truncated cone-shaped repair ring 2 matched with the inner hole of the hard alloy blank 1, namely, the included angle between a bus and an axis of the repair ring 2 is consistent with the included angle between the bus and the axis of the inner hole, then placing the repair ring 2 into the inner hole, and ensuring that both ends of the repair ring 2 exceed 12-3 mm of the hard alloy blank after the repair ring 2 is tightly attached to the inner hole, so that the repair ring 2 cannot shrink to completely enter the inner hole in the subsequent sintering step, ensuring that the repair is successful, wherein the material composition of the repair ring 2 is identical with the material composition of the hard alloy blank 1 in the subsequent sintering step, and ensuring that the repair ring 2 and the hard alloy blank 1 can be completely fused;
s3, a pressurizing hole is formed in the center of the repairing ring 2 along the axial direction, a graphite core is placed in the pressurizing hole, a weight is placed on the graphite core, so that the radial extrusion force of the graphite core to the pressurizing hole of the repairing ring 2 is increased, the repairing ring 2 can be always clung to an inner hole, in the step, the two ends of the graphite core are required to exceed the repairing ring by 25-10 mm, and the uniform application of the graphite core to the inner wall of the pressurizing hole of the whole repairing ring 2 is ensured;
s4, placing the hard alloy blank 1 with the repair ring 2 and the graphite core inserted in the S3 into a sintering furnace for sintering, wherein the sintering steps are as follows: placing the hard alloy blank 1 inserted with the repair ring 2 and the graphite core into a sintering furnace, heating to 1400 ℃ within 4 hours, then preserving heat for 2 hours, and then cooling to room temperature along with the furnace;
and S5, after sintering, taking out the graphite core, combining the repair ring 2 and the hard alloy blank 1 into a whole, and then processing the inner hole to remove the redundant part, thereby obtaining the qualified hard alloy blank 1.
In the above steps, in order to reduce the manufacturing difficulty of the repair ring 2, the pressurizing hole of the repair ring 2 is a straight hole, and the graphite core is in order to generate better radial extrusion force, the graphite core comprises a core sleeve 3 and a core body 4, the core sleeve 3 is cylindrical, a round table-shaped core hole is formed along the axis of the core sleeve 3, the core body 4 is also round table-shaped, the core body 4 is inserted into the core hole, the core sleeve 3 is formed by splicing at least two core blocks, after the size of the repair ring 2 changes in the sintering process, the core sleeve 3 can be also propped up by the core body 4, the radial pressure on the repair ring 2 is always kept, and the repair ring 2 can be clung to the inner hole in the whole sintering process.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.
Claims (6)
1. The method for repairing the inner hole of the hard alloy blank is used for repairing the inner hole of the hard alloy blank with larger size and is characterized by comprising the following steps of: the method comprises the following steps:
s1, trimming an inner hole of a hard alloy blank (1) into a truncated cone shape;
s2, manufacturing a truncated cone-shaped repair ring (2) matched with an inner hole of the hard alloy blank (1), placing the repair ring (2) into the inner hole, wherein two ends of the repair ring (2) exceed the hard alloy blank (1) by 2-3 mm, and the components of the repair ring (2) are identical to those of the hard alloy blank (1);
s3, placing a graphite core in the repairing ring (2), and applying pressure to the graphite core to enable the repairing ring (2) to be tightly attached to the inner wall of the inner hole; the repairing ring (2) is provided with a pressurizing hole along the axial direction, the graphite core is placed in the pressurizing hole, and the pressurizing hole is a straight hole; the graphite core comprises a core sleeve (3) and a core body (4), wherein the core sleeve (3) is cylindrical, a round table-shaped core hole is formed along the axis of the core sleeve (3), the core body (4) is also round table-shaped, the core body (4) is inserted into the core hole, and the core sleeve (3) is formed by splicing at least two core blocks;
s4, placing the hard alloy blank (1) with the repair ring (2) and the graphite core inserted in the S3 into a sintering furnace for sintering;
and S5, after sintering, taking out the graphite core, combining the repair ring (2) with the hard alloy blank (1) into a whole, and then processing the inner hole.
2. The method for repairing the inner hole of the hard alloy blank according to claim 1, wherein the method comprises the following steps: in the step S1, an inner hole of the hard alloy blank (1) is trimmed into a round table shape, and the included angle between a bus and an axis is 1.5-3 degrees.
3. The method for repairing the inner hole of the hard alloy blank according to claim 1, wherein the method comprises the following steps: the wall thickness of the repair ring (2) is 8-10 mm.
4. The method for repairing the inner hole of the hard alloy blank according to claim 1, wherein the method comprises the following steps: in the step S3, both ends of the graphite core exceed the repair ring (2) by 5-10 mm.
5. The method for repairing the inner hole of the hard alloy blank according to claim 1, wherein the method comprises the following steps: the sintering step in the step S4 is as follows: the hard alloy blank (1) inserted with the repair ring (2) and the graphite core is placed into a sintering furnace, heated to 1350-1450 ℃ within 3-5 hours, then kept for 1.5-2.5 hours, and cooled to room temperature along with the furnace.
6. The method for repairing the inner hole of the hard alloy blank according to claim 5, wherein the method comprises the following steps: and heating the hard alloy blank (1) placed in the sintering furnace to 1400 ℃ within 4 hours, preserving heat for 2 hours, and cooling to room temperature along with the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233710.5A CN114029491B (en) | 2021-10-22 | 2021-10-22 | Method for repairing inner hole of hard alloy blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233710.5A CN114029491B (en) | 2021-10-22 | 2021-10-22 | Method for repairing inner hole of hard alloy blank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114029491A CN114029491A (en) | 2022-02-11 |
| CN114029491B true CN114029491B (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111233710.5A Active CN114029491B (en) | 2021-10-22 | 2021-10-22 | Method for repairing inner hole of hard alloy blank |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4652255B2 (en) * | 2006-03-08 | 2011-03-16 | 株式会社トクヤマ | Repair method for sintered ceramics |
| CN202343944U (en) * | 2011-12-21 | 2012-07-25 | 株洲精工硬质合金有限公司 | Graphite core for sintering hard alloy |
| CN102747242B (en) * | 2012-07-26 | 2014-05-14 | 株洲金鼎硬质合金有限公司 | Method for preparing large-size hard alloy |
| CN103695835B (en) * | 2013-12-10 | 2015-12-09 | 浙江恒成硬质合金有限公司 | A kind of Hard alloy filler repair technology |
| CN104708267A (en) * | 2015-04-02 | 2015-06-17 | 中国人民解放军军械工程学院 | Repairing method for cannon barrel inner chamber |
| CN110509016B (en) * | 2019-08-27 | 2020-12-11 | 江阴塞特精密工具有限公司 | Manufacturing process of ultra-fine hard alloy milling cutter |
| CN111822700B (en) * | 2020-07-24 | 2022-02-18 | 西安华山钨制品有限公司 | Method for eliminating internal quality defects of tungsten alloy |
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| CN114029491A (en) | 2022-02-11 |
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