CN113926874A - Magnesium alloy micro-fine pipe extrusion die and extrusion method of magnesium alloy micro-fine pipe - Google Patents
Magnesium alloy micro-fine pipe extrusion die and extrusion method of magnesium alloy micro-fine pipe Download PDFInfo
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- CN113926874A CN113926874A CN202111111992.1A CN202111111992A CN113926874A CN 113926874 A CN113926874 A CN 113926874A CN 202111111992 A CN202111111992 A CN 202111111992A CN 113926874 A CN113926874 A CN 113926874A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/005—Continuous extrusion starting from solid state material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, rods or tubes
- B21C23/085—Making tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating extruded work or parts of the extrusion press
- B21C29/04—Cooling or heating extruded work or parts of the extrusion press of press heads, dies, or mandrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices for metal extruding, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
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Abstract
本发明公开的一种镁合金微细管材挤压模具，包括有由外至内依次套设的外模及内模，内模内设置有上模及下模，下模内部上表面开设有漏斗形安装槽，安装槽底部与下模内的管材导出通孔连通，安装槽内设置有型芯；内模、上模、下模与型芯围成模具型腔，用于放置被挤压镁合金坯料；外模外壁缠绕有电阻加热体，还包括有热电偶，热电偶依次穿过外模及内模的侧壁。该装置现了镁合金微细管材的连续挤压。还提供了一种镁合金微细管材的挤压方法，该方法解决了现有挤压工艺上的不足，能够制备出高质量的镁合金微细管材，而且挤压成本低。
The invention discloses a magnesium alloy fine tube extrusion die, which comprises an outer die and an inner die which are sleeved from the outside to the inside in sequence, an upper die and a lower die are arranged in the inner die, and a funnel-shaped upper surface of the lower die is opened on the inner surface. Installation groove, the bottom of the installation groove is connected with the pipe lead-out through hole in the lower mold, and a core is arranged in the installation groove; the inner mold, the upper mold, the lower mold and the core form a mold cavity for placing the extruded magnesium alloy The blank; the outer wall of the outer mold is wound with a resistance heating body, and also includes a thermocouple, and the thermocouple passes through the side walls of the outer mold and the inner mold in turn. The device realizes the continuous extrusion of magnesium alloy micro tubes. Also provided is a method for extruding a magnesium alloy fine tube, which solves the deficiencies in the existing extrusion process, can produce a high-quality magnesium alloy fine tube, and has low extrusion cost.
Description
Technical Field
The invention belongs to the technical field of plastic forming of nonferrous metals, and particularly relates to an extrusion die for a magnesium alloy micro-fine pipe and an extrusion method for the magnesium alloy micro-fine pipe.
Background
The magnesium resource in China is abundant, more than 60 percent of original magnesium and magnesium products are provided for the world in China every year for nearly 20 years, and with the continuous improvement of the output of the original magnesium and the magnesium products and the continuous and deep research of people on the magnesium alloy, processing equipment and a process of the magnesium alloy products make a series of breakthroughs, so that the processing of parts which are difficult to form becomes practical, the comprehensive performance of the parts is continuously improved, and the application field and the possibility of the magnesium alloy are greatly expanded. The magnesium alloy is the lightest metal structure material due to small density, high specific strength and specific rigidity, and excellent damping performance, electric conduction performance, heat conduction performance and electromagnetic shielding performance, and is widely applied to actual production. In addition, magnesium is an important element necessary for human body, and in the implantable metal material, the density and elastic modulus of magnesium alloy are closest to those of human bone, and the magnesium alloy can be completely degraded in human body, so that the magnesium alloy is accepted and applied in the biomedical field, can be used as degradable in vivo implants such as bone nails, bone plates, vascular stents and the like, and has more and more obvious advantages, especially other characteristics.
The magnesium alloy hot extrusion section bar has wide application, and has application in the fields of aviation, aerospace, automobiles, electronic products, medical appliances and the like. However, the processing of the magnesium alloy micro-pipe still has great difficulty, especially the processing of the micro-pipe. The magnesium alloy has a HCP structure, only three sliding systems can start at room temperature, so that the plastic deformation of the magnesium alloy is poor, the deformation processing is difficult, and the plastic processing technology of the magnesium alloy is not mature. The magnesium alloy micro-tube has smaller size and is more difficult to form, and cannot be produced by the common metal processing method for steel. Therefore, in order to machine a magnesium alloy microtube with a suitable size, systematic research on the forming process of the magnesium alloy microtube is required, and an extrusion die and a machining method which are simple in process, high in precision and easy to produce are developed.
In Beijing Industrial university patent "preparation method for Mg-Zn-Mn-Ca magnesium alloy micro-tube" (application No. 202011025209.5, publication No. 112246898A, published as 2021.01.22) and "a magnesium alloy micro-tube and preparation method thereof" (application No. 201710727803.0, publication No. 107570551A, published as 2018.01.12), a magnesium alloy micro-tube is prepared by performing multi-pass drawing on a tube blank by using a prefabricated tube blank, but the technical process is very complicated, the efficiency is low, and the tube cannot be continuously prepared due to the limitation of a processing mode. The invention provides a high-efficiency magnesium alloy micro-fine pipe hot extrusion die and a hot extrusion method.
Disclosure of Invention
The first purpose of the invention is to provide a magnesium alloy micro-fine pipe extrusion die, which realizes the continuous extrusion of the magnesium alloy micro-fine pipe.
The second purpose of the invention is to provide an extrusion method of a magnesium alloy micro-fine pipe, which solves the defects of the existing extrusion process, can prepare the high-quality magnesium alloy micro-fine pipe, and has low extrusion cost and high efficiency.
The first technical scheme adopted by the invention is that the magnesium alloy micro-fine pipe extrusion die comprises an outer die and an inner die which are sequentially sleeved from outside to inside, wherein an upper die and a lower die are arranged in the inner die, the upper surface in the lower die is provided with a funnel-shaped mounting groove, the bottom of the mounting groove is communicated with a pipe guiding through hole in the lower die, and a core is arranged in the mounting groove; the inner die, the upper die, the lower die and the core enclose a die cavity for placing extruded magnesium alloy blanks; the outer wall of the outer die is wound with a resistance heating body and further comprises a thermocouple, and the thermocouple sequentially penetrates through the side walls of the outer die and the inner die.
The present invention is also characterized in that,
the mold core comprises an umbrella-shaped upper core body, a rod-shaped lower core body is arranged at the center below the upper core body, and a plurality of notches are uniformly distributed on the upper core body; the upper core body provided with a plurality of gaps and the inner wall of the mounting groove form a welding chamber, and the extruded magnesium alloy blank is welded at the welding chamber.
The second technical scheme adopted by the invention is that the extrusion method of the magnesium alloy micro-fine pipe adopts the magnesium alloy micro-fine pipe extrusion die, and is implemented according to the following steps:
(1) installing the outer mold and the inner mold on an extrusion table, loading the extruded magnesium alloy blank subjected to rust removal, dirt removal and oxide skin removal into a mold cavity, and pressing the upper mold into the mold cavity by using a press;
(2) heating by using a resistance heating body arranged on the outer wall of the outer die to ensure that the extrusion temperature in the die cavity reaches 420-450 ℃;
(3) when the temperature reaches 420-450 ℃, preserving heat for 10-15min, starting a press machine, enabling the extruded magnesium alloy blank to enter a welding chamber through an upper core body of a core by the press machine through an upper die, then pressing the extruded magnesium alloy blank to move downwards, shunting the extruded magnesium alloy blank through the core, and extruding the magnesium alloy blank into a magnesium alloy micro-fine pipe after passing through the welding chamber.
The present invention is also characterized in that,
in the step (3), the extrusion speed is controlled to be 0.5-5 m/min.
The extruded magnesium alloy micro-fine pipe has an outer diameter of 1.2-3.0mm and a wall thickness of 0.05-0.15 mm.
The upper die, the lower die, the inner die, the outer die and the core are made of hot-work die steel 4Cr5MoV1 Si.
The invention has the beneficial effects that: the mould of the invention adopts a special core, and realizes the continuous extrusion of the magnesium alloy micro-fine pipe. The extruded material is extruded into the superfine pipe through a special mold core at one time, so that the extrusion process is simplified, and the production cost is reduced. The extrusion device and the extrusion method provided by the invention can be used for preparing the magnesium alloy micro-fine pipe with the outer diameter of 1.2-3.0mm and the wall thickness of 0.05-0.15 mm. The method of the invention solves the defects of the existing extrusion process, can prepare the high-quality magnesium alloy micro-fine pipe, and has low extrusion cost and high efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an extrusion die for a magnesium alloy micro-fine pipe of the present invention;
FIG. 2 is a schematic view of the construction of the core in the extrusion die of the present invention;
fig. 3 is a bottom view of the core in the extrusion die of the present invention.
In the figure, 1, an upper die, 2, an inner die, 3, an outer die, 4, an extruded magnesium alloy blank, 5, a resistance heating body, 6, a core, 7, a thermocouple, 8, a lower die, 9, a magnesium alloy micro-fine pipe, 10, a pipe lead-out through hole and 11, a mounting groove are formed;
6-1, an upper core body, 6-2, a lower core body and 6-1-1, a gap.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a magnesium alloy micro-fine pipe extrusion die, which comprises an outer die 3 and an inner die 2 which are sequentially sleeved from outside to inside, wherein an upper die 1 and a lower die 8 are arranged in the inner die 2, the upper surface in the lower die 8 is provided with a funnel-shaped mounting groove 11, the bottom of the mounting groove 11 is communicated with a pipe leading-out through hole 10 in the lower die 8, a core 6 is arranged in the mounting groove 11, and the mounting groove 11 is matched with the core 6 for use; the inner die 2, the upper die 1, the lower die 8 and the core 6 enclose a die cavity for placing the extruded magnesium alloy blank 4; the outer wall of the outer die 3 is wound with a resistance heating body 5, and the resistance heating body 5 (which can be a resistance heating wire) is electrified and heated, so that the extrusion temperature of the die cavity of the extrusion device reaches 420-450 ℃ from room temperature, and the hot extrusion requirement is met. The thermocouple device also comprises a thermocouple 7, and the thermocouple 7 sequentially penetrates through the side walls of the outer die 3 and the inner die 7. A certain taper is left between the inner wall of the outer die 3 and the outer wall of the inner die 2, so that the die is convenient to assemble and disassemble. The lower part of the core 6 forms a complete annular channel through which the extruded magnesium alloy billet 4 is extruded into a tube. By replacing the cores 6 with different sizes, the micro-pipes with different outer diameters and different wall thicknesses can be extruded. A thermocouple 7 is inserted in the inner die 2 and the outer die 3, and the thermocouple 7 and a temperature control device (type: XMT-121/122K temperature controller) of the resistance heating body 5 form a control loop for monitoring and controlling the temperature change in the extrusion process.
The mold core 6 comprises an umbrella-shaped upper core body 6-1, a rod-shaped lower core body 6-2 is arranged at the center below the upper core body 6-1, a plurality of gaps 6-1-1 are uniformly distributed on the upper core body 6-1, and a plurality of gaps 6-1-1 are distributed around the lower core body 6-2; the upper core body 6-1 provided with a plurality of gaps 6-1-1 and the inner wall of the mounting groove 11 form a welding chamber, and the extruded magnesium alloy blank 4 is welded at the welding chamber.
The invention also provides a method for extruding the superfine pipe, which adopts the magnesium alloy superfine pipe extrusion die and is implemented according to the following steps:
(1) the outer die 3 and the inner die 2 are arranged on an extrusion table, the extruded magnesium alloy blank 4 which is subjected to rust removal and dirt removal and oxide skin removal is arranged in a die cavity, and the upper die 1 is pressed into the die cavity by a press;
(2) heating by using a resistance heating body 5 arranged on the outer wall of the outer die 3 to ensure that the extrusion temperature in the die cavity reaches 420-450 ℃;
(3) when the temperature reaches 420-450 ℃, preserving heat for 10-15min, starting a press machine, enabling the extruded magnesium alloy blank 4 to enter a welding chamber through an upper core body 6-1 of a core 6 by the press machine through an upper die 1, then pressing the extruded magnesium alloy blank 4 to move downwards, shunting through the core 6, then extruding into the magnesium alloy micro-fine pipe 9 through the welding chamber.
In the step (3), during hot extrusion, the resistance heating body 5 is connected with a power supply and heated at a set temperature. The extrusion speed is controlled to be 0.5-5 m/min.
The extruded magnesium alloy micro-fine pipe 9 has an outer diameter of 1.2-3.0mm and a wall thickness of 0.05-0.15 mm.
The upper die 1, the lower die 7, the inner die 2, the outer die 3 and the core 6 are made of hot-work die steel 4Cr5MoV1 Si.
The method of the invention utilizes the characteristics of the refinement of the grain size of the blank and the improvement of the plastic deformation performance of the magnesium alloy in the extrusion process, directly and thermally extrudes the magnesium alloy blank into the magnesium alloy pipe, the pressure is low during the thermal extrusion, the extrusion is easy, the method is suitable for various presses, the wire discharging speed is high, the operation is convenient, the temperature of the magnesium alloy in the extrusion process is relatively low, only 420-450 ℃, the magnesium alloy can not generate phase change, the blank can not be oxidized in the thermal extrusion process, simultaneously, the upper die 1, the lower die 8, the inner die 2, the outer die 3 and the mold core 6 which are made of hot die steel 4Cr5MoV1Si can also work for a long time in the temperature range, the pipe prepared by the method has smooth and crackless surface, compact internal structure, convenient operation and high production efficiency. The magnesium alloy pipe prepared by the method has excellent quality, and the method is also suitable for continuously extruding other various light alloys or high alloy pipes difficult to extrude.
Example 1
The embodiment is an extrusion method for Mg-0.2Ag-3.0La magnesium alloy micro-fine pipes, which comprises the following steps:
(1) the outer die 3 and the inner die 2 are arranged on an extrusion table, the extruded magnesium alloy blank 4 which is subjected to rust removal and dirt removal and oxide skin removal is arranged in a die cavity, and the upper die 1 is pressed into the die cavity by a press;
(2) heating by using a resistance heating body 5 arranged on the outer wall of the outer die 3 to enable the extrusion temperature in the die cavity to reach 425 ℃;
(3) when the temperature reaches 425 ℃, keeping the temperature for 15min, starting a press machine, enabling the extruded magnesium alloy blank to enter a welding chamber through the upper section of a core 6 by the press machine through an upper die 1, then pressing the extruded magnesium alloy blank 4 to move downwards, controlling the extrusion speed to be 5m/min, shunting through the core 6, and extruding into a magnesium alloy micro-fine pipe with the outer diameter of phi 3.0mm and the wall thickness of 0.15mm through the welding chamber at the lower part of the core 6. The magnesium alloy micro-fine pipe prepared by the embodiment has good surface quality, accurate size, uniform, compact and flawless structure, the tensile strength is more than or equal to 300MPa, and the elongation is more than or equal to 6%.
Example 2
The embodiment is an extrusion method for Mg-2.0Zn-1.0Y magnesium alloy micro-fine pipes, which comprises the following steps:
(1) the outer die 3 and the inner die 2 are arranged on an extrusion table, the extruded magnesium alloy blank 4 which is subjected to rust removal and dirt removal and oxide skin removal is arranged in a die cavity, and the upper die 1 is pressed into the die cavity by a press;
(2) heating by using a resistance heating body 5 arranged on the outer wall of the outer die 3 to ensure that the extrusion temperature in the die cavity reaches 430 ℃;
(3) when the temperature reaches 430 ℃, keeping the temperature for 12min, starting a press machine, enabling the extruded magnesium alloy blank to enter a welding chamber through the upper section of a core 6 by the press machine through an upper die 1, then pressing the extruded magnesium alloy blank 4 to move downwards, controlling the extrusion speed to be 3m/min, shunting through the core 6, and then extruding into a magnesium alloy thin tube with the outer diameter of phi 2.0mm and the wall thickness of 0.10mm through the welding chamber at the lower part of the core 6. The magnesium alloy micro-fine pipe prepared by the embodiment has good surface quality, accurate size, uniform, compact and flawless structure, tensile strength of more than or equal to 350MPa and elongation of more than or equal to 8 percent
Example 3
The embodiment is an extrusion method for AZ91D magnesium alloy micro-tube, which comprises the following steps:
(1) the outer die 3 and the inner die 2 are arranged on an extrusion table, the extruded magnesium alloy blank 4 which is subjected to rust removal and dirt removal and oxide skin removal is arranged in a die cavity, and the upper die 1 is pressed into the die cavity by a press;
(2) heating by using a resistance heating body 5 arranged on the outer wall of the outer die 3 to enable the extrusion temperature in the die cavity to reach 420 ℃;
(3) when the temperature reaches 420 ℃, preserving heat for 10min, starting a press machine, enabling the extruded magnesium alloy blank to enter a welding chamber through the upper section of a core 6 by the press machine through an upper die 1, then pressing the extruded magnesium alloy blank 4 to move downwards, controlling the extrusion speed to be 4m/min, shunting through the core 6, and then extruding into a magnesium alloy thin tube with the outer diameter of phi 2.5mm and the wall thickness of 0.20mm through the welding chamber at the lower part of the core 6. The magnesium alloy micro-fine pipe prepared by the embodiment has good surface quality, accurate size, uniform, compact and flawless structure, the tensile strength is more than or equal to 280MPa, and the elongation is more than or equal to 7%.
Example 4
The embodiment is an extrusion method for an AM60B magnesium alloy micro-fine pipe, which comprises the following steps:
(1) the outer die 3 and the inner die 2 are arranged on an extrusion table, the extruded magnesium alloy blank 4 which is subjected to rust removal and dirt removal and oxide skin removal is arranged in a die cavity, and the upper die 1 is pressed into the die cavity by a press;
(2) heating by using a resistance heating body 5 arranged on the outer wall of the outer die 3 to enable the extrusion temperature in the die cavity to reach 420 ℃;
(3) when the temperature reaches 420 ℃, preserving heat for 10min, starting a press machine, enabling the extruded magnesium alloy blank to enter a welding chamber through the upper section of a core 6 by the press machine through an upper die 1, then pressing the extruded magnesium alloy blank 4 to move downwards, controlling the extrusion speed to be 1m/min, shunting through the core 6, and then extruding into a magnesium alloy thin tube with the outer diameter of phi 2.0mm and the wall thickness of 0.20mm through the welding chamber at the lower part of the core 6. The magnesium alloy micro-fine pipe prepared by the embodiment has good surface quality, accurate size, uniform, compact and flawless structure, the tensile strength is more than or equal to 300MPa, and the elongation is more than or equal to 16%.
Example 5
The embodiment is an extrusion method for ZK61M magnesium alloy micro-fine pipes, which comprises the following steps:
(1) the outer die 3 and the inner die 2 are arranged on an extrusion table, the extruded magnesium alloy blank 4 which is subjected to rust removal and dirt removal and oxide skin removal is arranged in a die cavity, and the upper die 1 is pressed into the die cavity by a press;
(2) heating by using a resistance heating body 5 arranged on the outer wall of the outer die 3 to enable the extrusion temperature in the die cavity to reach 420 ℃;
(3) when the temperature reaches 420 ℃, keeping the temperature for 12min, starting a press machine, enabling the extruded magnesium alloy blank to enter a welding chamber through the upper section of a mold core 6 by the press machine through an upper mold 1, then pressing the extruded magnesium alloy blank 4 to move downwards, controlling the extrusion speed to be 0.5m/min, shunting through the mold core 6, and then extruding into a magnesium alloy thin tube with the outer diameter of phi 1.8mm and the wall thickness of 0.22mm through the welding chamber at the lower part of the mold core 6. The magnesium alloy micro-fine pipe prepared by the embodiment has good surface quality, accurate size, uniform, compact and flawless structure, the tensile strength is more than or equal to 320MPa, and the elongation is more than or equal to 6%.
Claims (6)
1. A magnesium alloy micro-fine pipe extrusion die is characterized by comprising an outer die (3) and an inner die (2) which are sequentially sleeved from outside to inside, wherein an upper die (1) and a lower die (8) are arranged in the inner die (2), the inner upper surface of the lower die (8) is provided with a funnel-shaped mounting groove (11), the bottom of the mounting groove (11) is communicated with a pipe guiding through hole (10) in the lower die (8), and a mold core (6) is arranged in the mounting groove (11); the inner die (2), the upper die (1), the lower die (8) and the core (6) enclose a die cavity for placing the extruded magnesium alloy blank (4); the outer wall of the outer die (3) is wound with a resistance heating body (5) and further comprises a thermocouple (7), and the thermocouple (7) sequentially penetrates through the outer die (3) and the side wall of the inner die (7).
2. The magnesium alloy micro-fine pipe extrusion die as set forth in claim 1, wherein the core (6) comprises an umbrella-shaped upper core body (6-1), a rod-shaped lower core body (6-2) is arranged at the center below the upper core body (6-1), and a plurality of notches (6-1-1) are uniformly distributed on the upper core body (6-1); the upper core body (6-1) provided with a plurality of gaps (6-1-1) and the inner wall of the mounting groove (11) form a welding chamber, and the extruded magnesium alloy blank (4) is welded at the welding chamber.
3. The extrusion method of the magnesium alloy micro-fine pipe is characterized in that the extrusion die of the magnesium alloy micro-fine pipe according to claim 2 is adopted, and the extrusion method is implemented according to the following steps:
(1) the outer die (3) and the inner die (2) are arranged on an extrusion table, the extruded magnesium alloy blank (4) which is subjected to rust removal and dirt removal and oxide skin removal is arranged in a die cavity, and the upper die (1) is pressed into the die cavity by a press;
(2) heating by using a resistance heating body (5) arranged on the outer wall of the outer die (3) to ensure that the extrusion temperature in the die cavity reaches 420-450 ℃;
(3) when the temperature reaches 420-450 ℃, keeping the temperature for 10-15min, starting a press machine, enabling the extruded magnesium alloy blank (4) to enter a welding chamber through an upper core body (6-1) of a core (6) by the press machine through an upper die (1), then pressing the extruded magnesium alloy blank (4) to move downwards, shunting through the core (6), and extruding into a magnesium alloy micro-tube (9) after passing through the welding chamber.
4. The extrusion method of a magnesium alloy fine tube as recited in claim 3, wherein in the step (3), the extrusion speed is controlled to 0.5 to 5 m/min.
5. The extrusion method of a magnesium alloy fine pipe according to claim 3, wherein the extruded magnesium alloy fine pipe (9) has an outer diameter of 1.2 to 3.0mm and a wall thickness of 0.05 to 0.15 mm.
6. The extrusion method of the magnesium alloy micro-fine pipe material according to the claim 3, characterized in that the upper die (1), the lower die (7), the inner die (2), the outer die (3) and the core (6) are made of hot work die steel 4Cr5MoV1 Si.
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| CN115488180A (en) * | 2022-09-16 | 2022-12-20 | 鹤壁海镁科技有限公司 | A multi-channel grain refining device and extrusion method using the device |
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| CN106140852A (en) * | 2016-06-29 | 2016-11-23 | 重庆理工大学 | A high-strength toughness fine-grained light alloy pipe preparation mold and its preparation method |
| CN207238784U (en) * | 2017-10-18 | 2018-04-17 | 山东大学 | A kind of die device for being used to study Splicing Mechanism soldering process |
| CN110576071A (en) * | 2019-10-25 | 2019-12-17 | 重庆理工大学 | Forming dies for preparing ultra-fine grained magnesium alloys |
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| CN115488180A (en) * | 2022-09-16 | 2022-12-20 | 鹤壁海镁科技有限公司 | A multi-channel grain refining device and extrusion method using the device |
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