CN105499304A - Semi-solid forming method of composite pipe - Google Patents
Semi-solid forming method of composite pipe Download PDFInfo
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- CN105499304A CN105499304A CN201510893103.XA CN201510893103A CN105499304A CN 105499304 A CN105499304 A CN 105499304A CN 201510893103 A CN201510893103 A CN 201510893103A CN 105499304 A CN105499304 A CN 105499304A
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- plastic deformation
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- 239000002131 composite material Substances 0.000 title claims abstract description 72
- 238000010099 solid forming Methods 0.000 title abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 86
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000001192 hot extrusion Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 9
- 238000001125 extrusion Methods 0.000 claims abstract description 8
- 238000007493 shaping process Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000007787 solid Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 9
- 229910000906 Bronze Inorganic materials 0.000 description 7
- 229910000975 Carbon steel Inorganic materials 0.000 description 7
- 239000010974 bronze Substances 0.000 description 7
- 239000010962 carbon steel Substances 0.000 description 7
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 7
- 238000005098 hot rolling Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 238000000113 differential scanning calorimetry Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention relates to a semi-solid forming method of a composite pipe, and belongs to the technical field of semi-solid forming of metal. The semi-solid forming method comprises the following steps: at first, pouring a three-layered material by a centrifugal casting machine to obtain a composite pipe blank (at first, pouring an outer-layer easy-to-plastic deformation material, then pouring the middle-layer difficult-to-plastic deformation material, and at last, pouring an inner-layer easy-to-plastic deformation material); then, heating the composite pipe blank to the solid-liquid temperature interval of the difficult-to-plastic deformation material to enable the composite pipe blank to be in the semi-solid state, and reducing the diameter and the wall thickness of the composite pipe blank through high-speed extrusion, so as to obtain a pipe with a certain length; and at last, heating the hot extrusion pipe, so as to obtain a composite pipe with different mechanical properties. The semi-solid forming method solves the problem that a difficult-to-deformation pipe is difficult to process and manufacture, long in forming cycle, and high in product cost, and expands the application field of a semi-solid forming technology.
Description
Technical field
The present invention relates to a kind of composite material tube semi-solid-state shaping method, belong to semi-solid metal forming technical field.
Background technology
Multilayer materials is the composite two or more layers of material being combined to form stable bond, the advantages of various metals material can be got up by it, composite is made to possess special physics, chemistry, mechanical property, meet the requirements such as high strength, high specific strength, high specific stiffness, high-wearing feature, high antifatigue, high corrosion-resistant, thus be widely used in the fields such as mechanical engineering, Aero-Space, Vehicle Engineering, petrochemical industry, power industry.
At present, the preparation method of multilayer materials tubing can be divided into according to combining form: mechanical bond and the large class of metallurgical binding two.In recent years, develop multiple composite bimetal pipe forming method both at home and abroad, successively propose the multiple complex methods such as metallurgical compound, Explosion composite, soldering compound, hydraulic pressure compound and drawing compound, each forming method all has its pluses and minuses.The manufacturing process of metallurgical binding multiple tube mainly contains: hot rolling metallurgical composite pipe, centrifugal aluminothermic process metallurgical composite pipe, hot extrusion metallurgical composite pipe, soldering metallurgical composite pipe and blast metallurgical composite pipe.Mechanical composite tube mainly contains: hydraulic machinery multiple tube, blast mechanical composite tube and roll extrusion mechanical composite tube.The metallurgical composite algorithm principle of hot rolling forms multiple tube hot rolling blank for being cast in advance by alloy material in outer tube forging and stamping blank, and then temperature control hot rolling, becomes the Compound Extrusion pipe of metallurgical binding after hot rolling.Hydroform method principle is for be set in together inner and outer pipes, to pressurization in pipe, along with overpressure raises, inner tube enters state of plastic deformation by elastic deformation, and is adjacent to outer tube, when overpressure reaches certain value, outer tube generation elastic deformation, two pipes fit tightly together, when after inner tube pressure removal, as outer tube elastic resilience is greater than the elastic resilience of inner tube, then inner and outer pipes fits tightly.Hydraulic pressure composite algorithm contact is evenly distributed, and is convenient to control, and pipe internal surface is without scratch and breakoff phenomenon, and the method is by the extensive use of multiple tube manufacturer.Explosion composite method principle is the shock wave utilizing explosive charge to produce, and makes two kinds of metal surfaces realize the method for Solid-phase welding or machinery laminating.The Aeroform method of metal composite pipe generally has two kinds: one is indirect method, namely first two kinds of composite metal plates are obtained by Aeroform method, again through hot rolling, cold rolling one-tenth composite band, then carry out on welded pipe units continuous roll type shaping, weld to obtain composite metal pipe; Another kind is direct method, is first inner and outer tubes to be assembled into composite pipe blank, and the shock wave that pipe implode produces makes interior pipe generation plastic deformation be close on outer tube.But above-mentioned manufacturing process respectively has pluses and minuses, and bad for the adaptability of difficult plastic deformation material.
Semi-solid state forming technique is a kind of metal from liquid state to Solid State Transformation or the method that forms from the solid-state characteristic had to liquid state (i.e. solid-liquid) process.The method have fill type steadily, splash less, shrinkage factor is little, yield strength is low, good fluidity, little to the thermal shock of mould, mechanical property is high, can realize the features such as high speed near-net forming.Therefore, for the feature of difficult-to-deformation material, exploitation difficult-to-deformation material semi-solid-state shaping, is expected to the processing and manufacturing problem solving difficult-to-deformation material pipe type element.
Summary of the invention
For above-mentioned prior art Problems existing and deficiency, the invention provides a kind of composite material tube semi-solid-state shaping method.The problems such as the method solves difficult-to-deformation material pipe type element processing and manufacturing difficulty, forming period is long, product cost is high, widen the application of semi-solid state forming technique, the present invention is achieved through the following technical solutions.
Technical scheme of the present invention is: first utilize centrifugal casting machine to pour into a mould trilaminate material, obtain composite pipe, and the outer easily plastic deformation material of first cast, then pours into a mould the difficult plastic deformation material in intermediate layer, finally pour into a mould the easy plastic deformation material of internal layer; Then composite pipe is heated to difficult-to-deformation material solid-liquid humidity province chien shih its be in semisolid, and adopt high speed hot extrusion to make pipe tube reducing subtract wall, obtain the tubing of certain length, finally the tubing of hot extrusion is heat-treated, obtain the composite material tube of different mechanical properties, specifically comprise the steps:
(1) solidus and the liquidus temperature of the difficult plastic deformation material in intermediate layer is measured;
(2) centrifugal casting machine casting is adopted to obtain 3-layer composite material pipe: the first outer easily plastic deformation material of cast, then the difficult plastic deformation material in intermediate layer is poured into a mould, finally pour into a mould the easy plastic deformation material of internal layer, its ectomesoderm easy plastic deformation material and the easy plastic deformation material of internal layer are same material;
(3), between 3-layer composite material heating of pipe blank step (2) obtained to the solidus and liquidus temperature of the difficult plastic deformation material in intermediate layer, controlling intermediate layer difficult plastic deformation material liquid phase rate is 10 ~ 30%;
(4) the 3-layer composite material pipe after step (3) heating is carried out high speed hot extrusion, be shaped and terminate rear air cooling to room temperature;
(5) will heat-treat after step (4) high-speed extrusion, finally obtain composite material tube.
The liquidus temperature of the difficult plastic deformation material in described step (2) is less than the solidus temperature of easy plastic deformation material.
The easy plastic deformation material thickness of described step (2) ectomesoderm
t w , the difficult plastic deformation material thickness in intermediate layer
t z , the easy plastic deformation material thickness of internal layer
t n ratio is 1 ~ 1.2:1:0.3 ~ 0.5 or 0.3 ~ 0.5:1:1 ~ 1.2.
The rate of deformation of described step (4) high speed hot extrusion is 5 ~ 20s
-1.
Feature of the present invention: be exactly utilize centrifugal casting machine to pour into a mould trilaminate material, obtain composite pipe, the outer easily plastic deformation material of first cast, then pours into a mould the difficult plastic deformation material in intermediate layer, finally pours into a mould the easy plastic deformation material of internal layer; Then composite pipe is heated to difficult-to-deformation material solid-liquid humidity province chien shih its be in semisolid, and adopt high speed hot extrusion to make pipe tube reducing subtract wall, obtain the tubing of certain length, finally the tubing of hot extrusion is heat-treated, obtain the composite material tube (as shown in Figure 1) of different mechanical properties.The present invention has short route, high efficiency, simple operation and other advantages, can obtain the composite material tube that interface bond strength is high.
The invention has the beneficial effects as follows:
(1) adopt the present invention, utilize centre spinning method to prepare three-layer composite pipe base, make difficult-to-deformation material coated by yielding material; Heating difficult-to-deformation material is interval to semi-solid temperature, prepares semi solid slurry, utilizes the hot-pressed composite pipe blank of high speed, thus realize the plastic deformation of difficult-to-deformation material, prepare difficult-to-deformation material pipe parts; The three-layer composite pipe base of different-thickness is accurately obtained by controlling centrifugal casting technique, and control the deformation temperature of high speed hot extrusion, three-layer composite pipe class part that extruding rate, mould structure obtain different-thickness, realize the processing and manufacturing of difficult-to-deformation material pipe type element.
(2) adopt the present invention, high speed hot extrusion deformation temperature is controlled in difficult-to-deformation material semi-solid temperature interval, thus reduce shaping load 20 ~ 40%.
(3) the present invention has short route, high efficiency, simple operation and other advantages, can obtain the composite pipe that interface bond strength is high.
Accompanying drawing explanation
Fig. 1 is the composite material tube structural representation that the present invention prepares.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1
Prepare composite material tube for Q235 carbon steel and rich chromium cast iron, the difficult plastic deformation material in intermediate layer is rich chromium cast iron, and easy plastic deformation material is Q235 carbon steel.
This composite material tube semi-solid-state shaping method, its concrete steps are as follows:
(1) measure solidus and the liquidus temperature of the difficult plastic deformation material in intermediate layer, rich chromium cast iron solidus temperature is 1230 DEG C, liquidus temperature is 1420 DEG C to utilize differential scanning calorimetry (DSC) to measure;
(2) adopt centrifugal casting machine casting to obtain 3-layer composite material pipe: the first outer easily plastic deformation material of cast, thickness is 6mm, then pours into a mould the difficult plastic deformation material in intermediate layer, finally pours into a mould the easy plastic deformation material of internal layer; The easy plastic deformation material thickness of its ectomesoderm
t w , the difficult plastic deformation material thickness in intermediate layer
t z , the easy plastic deformation material thickness of internal layer
t n ratio is 1.2:1:0.5;
(3) 3-layer composite material heating of pipe blank step (2) obtained is to 1280 DEG C and be incubated 10min, and controlling intermediate layer difficult plastic deformation material liquid phase rate is 25%;
(4) (temperature is 1280 DEG C, the rate of deformation of high speed hot extrusion is 20s the 3-layer composite material pipe after step (3) heating to be carried out high speed hot extrusion
-1), be shaped and terminate rear air cooling to room temperature;
(5) will heat-treat after step (4) high-speed extrusion (being heated to 1000 DEG C of insulation 30min), final acquisition Q235 carbon steel-rich chromium cast iron-Q235 carbon steel composite material tube.
Embodiment 2
Prepare composite material tube for 45# carbon steel and ZCuSn10P1 tin bronze, the difficult plastic deformation material in intermediate layer is ZCuSn10P1 tin bronze, and easy plastic deformation material is 45# carbon steel.
This composite material tube semi-solid-state shaping method, its concrete steps are as follows:
(1) measure solidus and the liquidus temperature of the difficult plastic deformation material in intermediate layer, utilizing differential scanning calorimetry (DSC) to measure ZCuSn10P1 tin bronze solidus temperature is 820 DEG C, and liquidus temperature is 1003 DEG C;
(2) adopt centrifugal casting machine casting to obtain 3-layer composite material pipe: the first outer easily plastic deformation material of cast, thickness is 5mm, then pours into a mould the difficult plastic deformation material in intermediate layer, finally pours into a mould the easy plastic deformation material of internal layer; The easy plastic deformation material thickness of its ectomesoderm
t w , the difficult plastic deformation material thickness in intermediate layer
t z , the easy plastic deformation material thickness of internal layer
t n ratio is 1:1:0.3;
(3) 3-layer composite material heating of pipe blank step (2) obtained is to 900 DEG C and be incubated 25min, and controlling intermediate layer difficult plastic deformation material liquid phase rate is 30%;
(4) (temperature is 900 DEG C, the rate of deformation of high speed hot extrusion is 5s the 3-layer composite material pipe after step (3) heating to be carried out high speed hot extrusion
-1), be shaped and terminate rear air cooling to room temperature;
(5) will heat-treat after step (4) high-speed extrusion (being heated to 650 DEG C of insulation 1h), final acquisition 45# carbon steel-ZCuSn10P1 tin bronze-45# carbon steel composite material tube.
Embodiment 3
Prepare composite material tube for stainless steel and ZCuSn10 tin bronze, the difficult plastic deformation material in intermediate layer is ZCuSn10 tin bronze, and easy plastic deformation material is stainless steel.
This composite material tube semi-solid-state shaping method, its concrete steps are as follows:
(1) measure solidus and the liquidus temperature of the difficult plastic deformation material in intermediate layer, utilizing differential scanning calorimetry (DSC) to measure ZCuSn10 tin bronze solidus temperature is 830 DEG C, and liquidus temperature is 1020 DEG C;
(2) adopt centrifugal casting machine casting to obtain 3-layer composite material pipe: the first outer easily plastic deformation material of cast, thickness is 2mm, then pours into a mould the difficult plastic deformation material in intermediate layer, finally pours into a mould the easy plastic deformation material of internal layer; The easy plastic deformation material thickness of its ectomesoderm
t w , the difficult plastic deformation material thickness in intermediate layer
t z , the easy plastic deformation material thickness of internal layer
t n ratio is 0.4:1:1.2;
(3) 3-layer composite material heating of pipe blank step (2) obtained is to 920 DEG C and be incubated 5min, and the liquid fraction controlling intermediate layer difficult plastic deformation material ZCuSn10 tin bronze is 10%;
(4) (temperature is 920 DEG C, the rate of deformation of high speed hot extrusion is 12s the 3-layer composite material pipe after step (3) heating to be carried out high speed hot extrusion
-1), be shaped and terminate rear air cooling to room temperature;
(5) will heat-treat after step (4) high-speed extrusion (being heated to 700 DEG C of insulation 1.5h), finally obtain stainless steel-ZCuSn10 tin bronze-stainless steel composite material pipe.
Above the specific embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (4)
1. a composite material tube semi-solid-state shaping method, is characterized in that concrete steps are as follows:
(1) solidus and the liquidus temperature of the difficult plastic deformation material in intermediate layer is measured;
(2) adopt centrifugal casting machine casting to obtain 3-layer composite material pipe: the first outer easily plastic deformation material of cast, then pour into a mould the difficult plastic deformation material in intermediate layer, finally pour into a mould the easy plastic deformation material of internal layer;
(3), between 3-layer composite material heating of pipe blank step (2) obtained to the solidus and liquidus temperature of the difficult plastic deformation material in intermediate layer, controlling intermediate layer difficult plastic deformation material liquid phase rate is 10 ~ 30%;
(4) the 3-layer composite material pipe after step (3) heating is carried out high speed hot extrusion, be shaped and terminate rear air cooling to room temperature;
(5) will heat-treat after step (4) high-speed extrusion, finally obtain composite material tube.
2. composite material tube semi-solid-state shaping method according to claim 1, is characterized in that: the liquidus temperature of the difficult plastic deformation material in described step (2) is less than the solidus temperature of easy plastic deformation material.
3. composite material tube semi-solid-state shaping method according to claim 1, is characterized in that: the easy plastic deformation material thickness of described step (2) ectomesoderm
t w , the difficult plastic deformation material thickness in intermediate layer
t z , the easy plastic deformation material thickness of internal layer
t n ratio is 1 ~ 1.2:1:0.3 ~ 0.5 or 0.3 ~ 0.5:1:1 ~ 1.2.
4. composite material tube semi-solid-state shaping method according to claim 1, is characterized in that: the rate of deformation of described step (4) high speed hot extrusion is 5 ~ 20s
-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510893103.XA CN105499304A (en) | 2015-12-08 | 2015-12-08 | Semi-solid forming method of composite pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510893103.XA CN105499304A (en) | 2015-12-08 | 2015-12-08 | Semi-solid forming method of composite pipe |
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| CN105499304A true CN105499304A (en) | 2016-04-20 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106984782A (en) * | 2017-04-13 | 2017-07-28 | 燕山大学 | A kind of pulse current aids in many metal composite pipe horizontal continuous casting apparatus |
| CN107186200A (en) * | 2017-06-16 | 2017-09-22 | 重庆理工大学 | Metallurgical binding is molded between reinforcing double-level-metal method and mould |
| CN108215345A (en) * | 2018-01-26 | 2018-06-29 | 卓然(靖江)设备制造有限公司 | A kind of nested three extruding metals pipe |
| CN109465425A (en) * | 2018-12-27 | 2019-03-15 | 桂林理工大学 | A kind of manufacturing method of three layers of almag not uniform thickness composite ring slab |
| CN109676107A (en) * | 2018-12-27 | 2019-04-26 | 桂林理工大学 | A kind of three layers of the almag not compound ring short route manufacturing method of uniform thickness |
| CN111715723A (en) * | 2020-06-07 | 2020-09-29 | 张英华 | Production equipment and control method of high-temperature high-pressure seamless steel pipe |
| CN113172213A (en) * | 2021-04-09 | 2021-07-27 | 燕山大学 | Casting method of centrifugal composite roller |
| CN113333498A (en) * | 2021-04-28 | 2021-09-03 | 孟祥平 | Automatic machining process of stainless steel seamless steel pipe |
| WO2024187375A1 (en) * | 2023-03-14 | 2024-09-19 | 江苏徐工工程机械研究院有限公司 | Concrete placing boom, concrete pumping apparatus, and method and apparatus for manufacturing supports of concrete placing boom |
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Cited By (14)
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| CN106984782B (en) * | 2017-04-13 | 2019-05-28 | 燕山大学 | A kind of more metal composite pipe horizontal continuous casting apparatus of pulse current auxiliary |
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| CN109465425B (en) * | 2018-12-27 | 2020-11-24 | 桂林理工大学 | Manufacturing method of aluminum-magnesium alloy three-layer unequal-thickness composite annular casting blank |
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| CN109676107A (en) * | 2018-12-27 | 2019-04-26 | 桂林理工大学 | A kind of three layers of the almag not compound ring short route manufacturing method of uniform thickness |
| CN109676107B (en) * | 2018-12-27 | 2020-11-24 | 桂林理工大学 | Short-process manufacturing method of aluminum-magnesium alloy three-layer unequal-thickness composite ring piece |
| CN111715723A (en) * | 2020-06-07 | 2020-09-29 | 张英华 | Production equipment and control method of high-temperature high-pressure seamless steel pipe |
| CN111715723B (en) * | 2020-06-07 | 2024-03-08 | 张英华 | Production equipment and control method for high-temperature high-pressure seamless steel pipe |
| CN113172213A (en) * | 2021-04-09 | 2021-07-27 | 燕山大学 | Casting method of centrifugal composite roller |
| CN113172213B (en) * | 2021-04-09 | 2022-06-03 | 燕山大学 | Casting method of centrifugal composite roller |
| CN113333498A (en) * | 2021-04-28 | 2021-09-03 | 孟祥平 | Automatic machining process of stainless steel seamless steel pipe |
| WO2024187375A1 (en) * | 2023-03-14 | 2024-09-19 | 江苏徐工工程机械研究院有限公司 | Concrete placing boom, concrete pumping apparatus, and method and apparatus for manufacturing supports of concrete placing boom |
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