CN111957973A - Production process of light alloy rod with spiral hole inside - Google Patents
Production process of light alloy rod with spiral hole inside Download PDFInfo
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- CN111957973A CN111957973A CN202010966159.4A CN202010966159A CN111957973A CN 111957973 A CN111957973 A CN 111957973A CN 202010966159 A CN202010966159 A CN 202010966159A CN 111957973 A CN111957973 A CN 111957973A
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- alloy rod
- light alloy
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- spiral hole
- spiral
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- 229910001234 light alloy Inorganic materials 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 238000005245 sintering Methods 0.000 claims abstract description 21
- 238000001125 extrusion Methods 0.000 claims abstract description 19
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 238000005238 degreasing Methods 0.000 claims abstract description 15
- 238000000498 ball milling Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000001694 spray drying Methods 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
-
- 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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
- B22F3/1021—Removal of binder or filler
-
- 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
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
-
- 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
- B22F2005/103—Cavity made by removal of insert
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses a production process of a light alloy rod with a spiral hole inside, which comprises the following steps: ball milling, namely introducing the raw materials of the alloy rod into a ball mill for ball milling treatment; extrusion molding, namely obtaining a light alloy rod with a spiral hole inside through an extrusion die, introducing a water-soluble fiber rope into the extrusion die, and rotating the light alloy rod in the extrusion process to realize the spiral distribution of the water-soluble fiber rope in the light alloy rod; preheating, namely putting the light alloy rod into a steam box, introducing steam, and preheating the light alloy rod to dissolve the water-soluble fiber ropes so as to obtain spiral holes in the light alloy rod; sintering and degreasing, namely sintering and degreasing the light alloy rod by adopting vacuum sintering and degreasing equipment. According to the production process of the light alloy rod with the spiral holes, the transparent spiral holes are formed in the light alloy rod, the collapse problem of the spiral holes is avoided, the product percent of pass is high, the obtained light alloy rod is light in dead weight, and the cooling effect is good.
Description
Technical Field
The invention relates to the technical field of alloy rod production, in particular to a production process of a light alloy rod with a spiral hole inside.
Background
With the development of science and technology, the equipment manufacturing industry is rapidly developed, and great development opportunities are brought to relevant matched industrial enterprises. The manufacturers of the special hard alloy rod materials such as the special machining cutter and the drill bit in the equipment manufacturing field also face the important development opportunities, but the opportunities are accompanied by competition, and the research of enterprises in related fields at home and abroad aiming at the hard alloy rod material technology is continuously increased, so that the major breakthrough of the industry technology is realized, and the technology and the market opportunity are occupied.
The domestic hard alloy industry has the defects of unreasonable product structure, more middle and low-grade products, slow development of high-grade products and the like, and has the defects of large distance compared with the developed western countries, insufficient research and development of novel high-performance hard alloy, incomplete process, large energy consumption and pollution in the production process and the like. In order to reduce the weight of alloy bar, can process the cooling hole in the alloy bar, can promote the cooling effect, can reduce the dead weight again, but the cooling hole is mostly straight hole, and the processing of spiral hole is more complicated, the utility model discloses a patent No. 201620985408.3 utility model discloses an extrusion device of spiral carbide rod in the multithread, adopt the support to carry out the fixed of core bundle, in order expecting to obtain spiral hole in the alloy rod, but in the time production process, the support has hindered extruding of powder, the energy consumption has been increased, be unfavorable for the shaping of carbide rod, and core bundle length is limited, be unfavorable for the keeping of spiral hole, produce the collapse problem easily, even bury continuous core bundle, the later stage also is difficult to realize taking out of core bundle, cause the jam of hole.
Disclosure of Invention
The invention aims to provide a production process of a light alloy rod with a spiral hole inside, so that the light alloy rod with the spiral hole inside is obtained, and the problems of blockage and collapse of an inner hole are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of a light alloy rod with a spiral hole inside comprises the following steps: ball milling, namely introducing the raw materials of the alloy rod into a ball mill, carrying out ball milling treatment to obtain powder particles, controlling the ball milling time to be 65-80H, and colliding the powder particles to refine the powder;
drying, namely performing vacuum drying or spray drying powder preparation treatment on the ball-milled powder particles to enable the particle size of the powder to be 3-4 microns;
extrusion molding, namely adding paraffin powder into powder particles, uniformly mixing, introducing the powder particles into an extruder, obtaining a light alloy rod containing spiral holes through an extrusion die, and accelerating the cooling speed so as to improve the rotating speed of a cutter, improve the precision and prolong the service life, introducing a water-soluble fiber rope into the extrusion die, and rotating the light alloy rod in the extrusion process to realize the spiral distribution of the water-soluble fiber rope in the light alloy rod;
preheating, namely putting the light alloy rod into a steam box, introducing steam, and preheating the light alloy rod to dissolve the water-soluble fiber ropes so as to obtain spiral holes in the light alloy rod;
and sintering and degreasing, namely sintering and degreasing the light alloy rod by adopting vacuum sintering and degreasing equipment, wherein the sintering temperature is 1450-1480 ℃, and the sintering time is 10-15 hours.
Wherein the raw materials comprise WC, TiC, BN, Co, Mo and Ni.
The raw materials comprise the following components in parts by weight: 10-20 parts of WC, 45-55 parts of TiC, 1-2 parts of BN, 5-10 parts of Co, 8-12 parts of Mo and 10-20 parts of Ni.
And an air blowing step is also arranged between the preheating step and the sintering degreasing step, an air gun is inserted into one end of the spiral hole, air flow is introduced to clean the spiral hole, and residues of the water-soluble fiber ropes are blown out.
The water-soluble fiber rope comprises a steel wire and water-soluble fibers wound on the surface of the steel wire.
In the preheating step, after the water-soluble fibers in the water-soluble fiber ropes are dissolved, the steel wire is drawn out.
The invention has the beneficial effects that: a production process of a light alloy rod with a spiral hole inside is characterized in that a water-soluble fiber rope is particularly led into an extrusion die to perform the pre-forming of the spiral hole in the light alloy rod and subsequently remove the water-soluble fiber rope to obtain a through spiral hole, so that the collapse problem of the spiral hole is avoided, the product percent of pass is high, the obtained light alloy rod has light dead weight and good cooling effect, the rotation speed of a cutter is favorably improved, the hardness is high, and the application range is wide.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
A production process of a light alloy rod with a spiral hole inside comprises the following steps:
proportioning, wherein the raw materials of the alloy rod comprise WC, TiC, BN, Co, Mo and Ni, 10-20 parts of WC, 45-55 parts of TiC, 1-2 parts of BN, 5-10 parts of Co, 8-12 parts of Mo and 10-20 parts of Ni are weighed and mixed, and the hardness of the subsequent alloy rod is ensured by reinforcing through BN;
ball milling, namely introducing the raw materials of the alloy rod into a ball mill, performing ball milling treatment to obtain powder particles, controlling the ball milling time to be 72H, and colliding the powder particles to ensure that the powder refining effect is more detailed, thereby being beneficial to improving the density, the bending strength and the hardness value of a subsequent sintered body;
drying, namely performing vacuum drying or spray drying powder preparation treatment on the ball-milled powder particles to enable the particle size of the powder to be 3.5 mu m, so that the heat transfer is enhanced, and the water evaporation rate is increased;
extrusion molding, namely adding paraffin powder into powder particles, uniformly mixing, facilitating subsequent extrusion molding, then guiding the powder particles into an extruder, obtaining a light alloy rod containing spiral holes through an extrusion die, and accelerating cooling speed so as to improve the rotating speed of a cutter, improve precision and prolong service life, guiding a water-soluble fiber rope into the extrusion die, and rotating the light alloy rod in the extrusion process to realize spiral distribution of the water-soluble fiber rope in the light alloy rod;
preheating, namely putting the light alloy rod into a steam box, introducing steam, preheating the light alloy rod, and keeping the temperature for 10 minutes to dissolve the water-soluble fiber rope and obtain a spiral hole in the light alloy rod, wherein the water-soluble fiber rope comprises a steel wire and water-soluble fibers wound on the surface of the steel wire, and the steel wire is drawn out after the water-soluble fibers in the water-soluble fiber rope are dissolved, so that the operation is simple and convenient;
air blowing, namely inserting an air gun into one end of the spiral hole, introducing air flow to clean the spiral hole, blowing out residues of the water-soluble fiber ropes, and drying moisture on the surface of the light alloy rod, so that the operation is quick, the heat loss of the light alloy rod is reduced, the subsequent sintering degreasing is facilitated, and the energy consumption is reduced;
and sintering and degreasing, namely sintering and degreasing the light alloy rod by adopting vacuum sintering and degreasing equipment, wherein the sintering temperature is 1480 ℃, and the sintering time is 10 hours, so that the oxidation of the product can be reduced, the carbon control difficulty is reduced, the hardness of the light alloy rod is over 92 HRA, the dead weight is light, the comprehensive performance is excellent, and the method is suitable for processing various cutters.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (6)
1. A production process of a light alloy rod with a spiral hole is characterized by comprising the following steps: ball milling, namely introducing the raw materials of the alloy rod into a ball mill, carrying out ball milling treatment to obtain powder particles, controlling the ball milling time to be 65-80H, and colliding the powder particles to refine the powder;
drying, namely performing vacuum drying or spray drying powder preparation treatment on the ball-milled powder particles to enable the particle size of the powder to be 3-4 microns;
extrusion molding, namely adding paraffin powder into the powder particles, uniformly mixing, then introducing into an extruder, obtaining a light alloy rod with a spiral hole through an extrusion die, introducing a water-soluble fiber rope into the extrusion die, and rotating the light alloy rod in the extrusion process to realize spiral distribution of the water-soluble fiber rope in the light alloy rod;
preheating, namely putting the light alloy rod into a steam box, introducing steam, and preheating the light alloy rod to dissolve the water-soluble fiber ropes so as to obtain spiral holes in the light alloy rod;
and sintering and degreasing, namely sintering and degreasing the light alloy rod by adopting vacuum sintering and degreasing equipment, wherein the sintering temperature is 1450-1480 ℃, and the sintering time is 10-15 hours.
2. The process for producing the lightweight alloy rod with the spiral hole as claimed in claim 1, wherein the raw material comprises WC, TiC, BN, Co, Mo and Ni.
3. The production process of the light alloy rod with the spiral hole as claimed in claim 2, wherein the raw materials comprise the following components in parts by weight: 10-20 parts of WC, 45-55 parts of TiC, 1-2 parts of BN, 5-10 parts of Co, 8-12 parts of Mo and 10-20 parts of Ni.
4. The process for producing the light alloy rod with the spiral hole as claimed in claim 1, wherein an air blowing step is further performed between the preheating step and the sintering degreasing step, an air gun is inserted into one end of the spiral hole, air flow is introduced to clean the spiral hole, and residues of the water-soluble fiber ropes are blown out.
5. The process for producing the lightweight alloy rod with the spiral hole as claimed in claim 1, wherein the water-soluble fiber rope comprises a steel wire and water-soluble fibers wound on the surface of the steel wire.
6. The process for producing a lightweight alloy rod with a spiral hole according to claim 5, wherein the steel wire is drawn out after the water-soluble fibers in the water-soluble fiber rope are dissolved in the preheating step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010966159.4A CN111957973A (en) | 2020-09-15 | 2020-09-15 | Production process of light alloy rod with spiral hole inside |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010966159.4A CN111957973A (en) | 2020-09-15 | 2020-09-15 | Production process of light alloy rod with spiral hole inside |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111957973A true CN111957973A (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010966159.4A Pending CN111957973A (en) | 2020-09-15 | 2020-09-15 | Production process of light alloy rod with spiral hole inside |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5601857A (en) * | 1990-07-05 | 1997-02-11 | Konrad Friedrichs Kg | Extruder for extrusion manufacturing |
| CN203061591U (en) * | 2012-12-25 | 2013-07-17 | 苏州瑞森硬质合金有限公司 | Equipment for producing alloy bar with helical inner cooling hole |
| CN204817511U (en) * | 2015-06-16 | 2015-12-02 | 苏州瑞森硬质合金有限公司 | Alloy rod internal cooling hole shaper |
| CN105855310A (en) * | 2016-06-02 | 2016-08-17 | 苏州瑞森硬质合金有限公司 | High-stability spiral inner cooling hole alloy bar material device |
| JP2016221670A (en) * | 2015-05-29 | 2016-12-28 | タイユ株式会社 | Processing method for hardly cuttable material |
| CN107779717A (en) * | 2017-09-20 | 2018-03-09 | 苏州瑞森硬质合金有限公司 | Light-high-strength titanium-based fine grain hard alloy bar material and its preparation technology |
| WO2018127031A1 (en) * | 2017-01-03 | 2018-07-12 | 张晓冬 | New-type mixed composite pipe, preparation method and application |
| CN109772914A (en) * | 2019-03-20 | 2019-05-21 | 苏州瑞森硬质合金有限公司 | A kind of alloy bar extruding production technology containing radial groove |
| WO2019173855A1 (en) * | 2018-03-12 | 2019-09-19 | Ceratizit Austria Gesellschaft M.B.H. | Method for producing a sinter-joined composite body |
| CN110947973A (en) * | 2019-11-07 | 2020-04-03 | 湖南工业大学 | Forming method of hard alloy bar with spiral hole |
-
2020
- 2020-09-15 CN CN202010966159.4A patent/CN111957973A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5601857A (en) * | 1990-07-05 | 1997-02-11 | Konrad Friedrichs Kg | Extruder for extrusion manufacturing |
| CN203061591U (en) * | 2012-12-25 | 2013-07-17 | 苏州瑞森硬质合金有限公司 | Equipment for producing alloy bar with helical inner cooling hole |
| JP2016221670A (en) * | 2015-05-29 | 2016-12-28 | タイユ株式会社 | Processing method for hardly cuttable material |
| CN204817511U (en) * | 2015-06-16 | 2015-12-02 | 苏州瑞森硬质合金有限公司 | Alloy rod internal cooling hole shaper |
| CN105855310A (en) * | 2016-06-02 | 2016-08-17 | 苏州瑞森硬质合金有限公司 | High-stability spiral inner cooling hole alloy bar material device |
| WO2018127031A1 (en) * | 2017-01-03 | 2018-07-12 | 张晓冬 | New-type mixed composite pipe, preparation method and application |
| CN107779717A (en) * | 2017-09-20 | 2018-03-09 | 苏州瑞森硬质合金有限公司 | Light-high-strength titanium-based fine grain hard alloy bar material and its preparation technology |
| WO2019173855A1 (en) * | 2018-03-12 | 2019-09-19 | Ceratizit Austria Gesellschaft M.B.H. | Method for producing a sinter-joined composite body |
| CN109772914A (en) * | 2019-03-20 | 2019-05-21 | 苏州瑞森硬质合金有限公司 | A kind of alloy bar extruding production technology containing radial groove |
| CN110947973A (en) * | 2019-11-07 | 2020-04-03 | 湖南工业大学 | Forming method of hard alloy bar with spiral hole |
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