CN1792488A - Method and apparatus for forming magnesium alloy pipe - Google Patents
Method and apparatus for forming magnesium alloy pipe Download PDFInfo
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- CN1792488A CN1792488A CN 200510107331 CN200510107331A CN1792488A CN 1792488 A CN1792488 A CN 1792488A CN 200510107331 CN200510107331 CN 200510107331 CN 200510107331 A CN200510107331 A CN 200510107331A CN 1792488 A CN1792488 A CN 1792488A
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Abstract
A shaping method for Mg-alloy pipe includes such steps as heating blank to superplastic shaping temp, putting the blank in a squeezing die set at same temp, and squeezing it to make it pass through a shaping hole consisting of bridge core and female die. Its apparatus is composed of pressing head, bridge core, female die, squeezing sleeve, baseplate and vertical plate.
Description
Technical field
The invention belongs to the forming technique field of magnesium-alloy tube, what relate generally to is a kind of manufacturing process and device of magnesium-alloy tube.
Background technology
At present, conventional tubing pressing method is to adopt the horizontal extruder of tape punching device to push, the longer pipe material that can be shaped, and forming speed is also than higher.But this method needs large-scale extrusion equipment, die needed size macrostructure complexity, and forming process is many, has the extruding clout, and equipment cost and production cost are all than higher.
Magnesium alloy is as one of the lightest structural metallic materials, and the important function in its loss of weight and performance improvement just is being subjected to people's pay attention to day by day.Because magnesium alloy plasticity is relatively poor, directly carry out relatively difficulty of plastic working, so it is casting technique that the common process of magnesium alloy adopts.Because cast sturcture and casting flaw make its mechanical property lower, often can not satisfy instructions for use.
Summary of the invention
The manufacturing process and the device that the purpose of this invention is to provide a kind of magnesium-alloy tube.Adopt superplasticity extruding and welding combined forming process to be shaped, make it have mechanical property and dimensional accuracy preferably.
The present invention realizes that the device of above-mentioned purpose comprises pressure head, extruded sleeve, core, die, backing plate and riser, bridge-type core and die are arranged in the extruded sleeve, the bridge-type core is positioned at the top of die, its core lower end some stretch in the die and the die nib between form annular extrusion orifice.The geometry and the size of the cross-sectional geometry of the core of core and size decision tubing endoporus, the geometry and the size of the geometry of die nib and size decision tubing profile.
The present invention realizes that the technical scheme that above-mentioned purpose is taked is: the blank that will be heated to superplastic forming temperature is put into the mould with same temperature, making blank produce plasticity by extruding flows, form tubing by forming annular extrusion orifice between core and die nib again through interflow behind the tap hole, become seamless tubular goods by superplastic diffusion welding between blank.
The heating of mould of the present invention realizes heating by heating furnace is set outside mould.
Extrusion speed of the present invention is 0.2～5 mm/second, and the superplasticity extrusion temperature is 200～450 ℃.
Manufacturing process of the present invention and device can use on general vertical or horizontal hydraulic machine.It is lower to have equipment cost, simple in structure, convenience operation.
The present invention adopts supply status bar blank, can be as-cast structure or extruding attitude tissue.The magnesium alloy pipe tissue of producing is continuous streamline structure feature, and casting flaw is eliminated or improved, and has mechanical property and dimensional accuracy preferably.Compare with the extrusion process of routine, stock utilization is higher.Changing the tubing that the geometry of the core of core and die nib can be shaped has: 1. wall thickness pipe such as non-revolved body, as elliptical tube, square tube, rectangular tube, prismatic pipe etc.; 2. the non-wall thickness pipe that waits; 3. the profile of tubing or interior pore area tooth are as inside and outside spline, straight spur gear etc.; 4. the profile of tubing and interior pore area helical teeth, as inside and outside helical gears, great-lift angle multiple-threaded screw, nut etc.
The manufacturing process of the magnesium alloy pipe that the present invention proposes has the following advantages:
1, the accurate superplasticforming technology of the high employing of dimensional accuracy, the shape of product guarantees that by the shape of mould dimensional accuracy is higher.
2, the stock utilization height can be realized continuously extruded shaping, promptly puts into solid bar successively in mould, and the pressure by hydraulic press, and longer pipe material serially is shaped.Do not have the extruding clout, its stock utilization is higher.
3, the high blank of product intensity has produced solid diffusion and is welded and is whole tubing in the flow deformation process, does not produce seam; Make cast sturcture's defective of blank be eliminated or improve, and form the streamline tissue, product intensity is improved.
4, mould structure is simply compared with existing methods for forming tubular product, and mould structure is obviously simplified.
5, processing cost is hanged down on common vertical or horizontal hydraulic machine and all can be used, and mould structure is simple, and energy consumption is low, and processing cost is further reduced.
Description of drawings
Accompanying drawing 1 is building mortion structural representation of the present invention.
Accompanying drawing 2 is building mortion bridge-type core structure cutaway view of the present invention.
Accompanying drawing 3 is building mortion bridge-type core structure upward view of the present invention.
Accompanying drawing 4～7 is building mortion core core section shape of the present invention.
Accompanying drawing 8～11 is building mortion die shape hole shape of the present invention.
Accompanying drawing 12 is building mortion band skewed slot die structure cutaway view of the present invention.
Accompanying drawing 13 is building mortion band skewed slot die structure vertical view of the present invention.
Among the figure: the 1-pressure head 2-blank 3-bridge-type core 4-die 5-tubing 6-extruded sleeve 7-backing plate 8-riser 9-bridge 10-of portion core 11-tap hole 12-serrate slot.
The specific embodiment
The present invention is described in more detail for embodiment provided by the invention.
Embodiment 1
The used mould structure of present embodiment as shown in Figure 1, bridge-type core 3 and die 4 place in the extruded sleeve 6, the upper surface of the bridge portion 9 of bridge-type core has tap hole, the lower end has supporting leg, make core 10 be placed at the center of extruded sleeve 6, the lower end of core 10 is (as Fig. 2, shown in Figure 3, its diameter conforms to the internal diameter of pipe) be deep into certain depth in the hole of die 4, form annular extrusion orifice with the die endoporus, the top of die endoporus has the work zone of 1～3mm, in order to determine the profile (its size conforms to the profile of tubing) of tubing, lower dimension is suitably amplified, to reduce frictional resistance.It is tubing in order to hold to extrude that the mould bottom is provided with space in the middle of 8,2 risers of 2 risers, and the fixing cutting tool on the top of riser can cut off the tubing of extruding on request.
The forming technology process of present embodiment is: after the magnesium alloy bar is heated to 200～450 ℃ of superplasticity temperature, is placed on and is heated in the mould extruded sleeve 6 with same temperature.Pressure head 1 descending (downstream rate is 0.2～5 mm/second) forces blank to produce plasticity and flows.Blank flows downward from the tap hole of bridge-type core, interflow then, and the annular extrusion orifice that flows downward again by 3 of die 4 and bridge-type cores forms uiform section pipe 5.Can realize the superplastic diffusion welding between its materials flow in the plasticity flow process behind the interflow.Blank is put in pressure head 1 backhaul once more, repeats said process, can realize the continuously extruded process of tubing.Require the cleaning surfaces of blank, to realize the superplasticity welding between blank.In extrusion process, after tubing 5 meets the requirements of length, its cut-out is promptly become a tubing with cutting tool.
Present embodiment is on the basis of embodiment 1, and the core shape (as Fig. 4～7) of the bridge-type core 3 by changing mould or the nib shape (as Fig. 8～11) of die 4 make extruded hole alteration of form between the two, the tubing of the different cross section shape that can be shaped.
Present embodiment is on the basis of embodiment 1, the core shape of the bridge-type core 3 by changing mould or the nib shape of die 4, and helical teeth shape tubing can be shaped.As shown in Figure 12 and Figure 13, the shape hole of die 4 has oblique serrate slot, during extruding materials flow is produced guide functions, and it is flowed out and formation helical teeth shape tubing 5 by the hand of spiral.
Claims (10)
1, a kind of manufacturing process of magnesium-alloy tube, it is characterized in that: the blank that will be heated to superplastic forming temperature is put into the mould with same temperature, make blank produce plasticity by extruding and flow, become tubing through the extruded hole formed by bridge-type core and die.
2, the manufacturing process of magnesium-alloy tube according to claim 1 is characterized in that: the superplasticity extrusion temperature is 200～450 ℃, and extrusion speed is 0.2～5 mm/second.
3, the manufacturing process of magnesium-alloy tube according to claim 1 is characterized in that: adopt continuous isothermal extrusion forming process to be shaped, product is weldless uiform section tubing.
4, the manufacturing process of magnesium-alloy tube according to claim 1 is characterized in that: mould is put in the blank segmentation, becomes continuous tubing through Diffusion Welding during extruding.
5, the manufacturing process of magnesium-alloy tube according to claim 1 is characterized in that: the flute profile part that wall thickness pipes such as wall thickness pipe or non-revolved body or wall thickness pipe such as non-or the toothed flute profile part of profile/endoporus or profile/interior pore area helical teeth such as is shaped as of tubing.
6, a kind of device of realizing the manufacturing process of the described magnesium-alloy tube of claim 1, comprise pressure head (1), bridge-type core (3), die (4), extruded sleeve (6), backing plate (7) and riser (8), it is characterized in that: in extruded sleeve (6), be provided with bridge-type core (3) and die (4), bridge-type core (3) is positioned at the top of die (4), and the lower end of its core (10) is stretched in the die (4) and formed annular extrusion orifice with the die nib.
7, the device of the manufacturing process of magnesium-alloy tube according to claim 6 is characterized in that: the upper surface of described bridge-type core (3) has tap hole (11), and the lower end has supporting leg (9) and core (10), and core (10) is positioned at bridge-type core center.
8, the device of the manufacturing process of magnesium-alloy tube according to claim 6 is characterized in that: the core (10) of described bridge-type core (3) and the nib shape of die (4) all can be circle, ellipse, rectangle, polygon.
9, the device of the manufacturing process of magnesium-alloy tube according to claim 6 is characterized in that: the core (10) of described bridge-type core (3) and the nib position of die (4) are equipped with serrate slot (12).
10, according to the device of the manufacturing process of claim 6 and 8 described magnesium-alloy tubes, it is characterized in that: the core (10) of described bridge-type core (3) or the set serrate slot in nib position (12) of die (4) are skewed slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510107331 CN1792488A (en) | 2005-12-19 | 2005-12-19 | Method and apparatus for forming magnesium alloy pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510107331 CN1792488A (en) | 2005-12-19 | 2005-12-19 | Method and apparatus for forming magnesium alloy pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1792488A true CN1792488A (en) | 2006-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510107331 Pending CN1792488A (en) | 2005-12-19 | 2005-12-19 | Method and apparatus for forming magnesium alloy pipe |
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| Country | Link |
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| CN (1) | CN1792488A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445028C (en) * | 2007-02-09 | 2008-12-24 | 青静 | Manufacturing process for porous opening metal pipe |
| CN109530470A (en) * | 2018-10-30 | 2019-03-29 | 北京长城华冠汽车科技股份有限公司 | The different forming device to cut section bar and method of local enhancement |
| CN113941035A (en) * | 2021-09-18 | 2022-01-18 | 西安理工大学 | Degradable blood vessel stent magnesium alloy pipe for inhibiting tumor proliferation and preparation method thereof |
-
2005
- 2005-12-19 CN CN 200510107331 patent/CN1792488A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445028C (en) * | 2007-02-09 | 2008-12-24 | 青静 | Manufacturing process for porous opening metal pipe |
| CN109530470A (en) * | 2018-10-30 | 2019-03-29 | 北京长城华冠汽车科技股份有限公司 | The different forming device to cut section bar and method of local enhancement |
| CN109530470B (en) * | 2018-10-30 | 2020-09-29 | 北京长城华冠汽车科技股份有限公司 | Forming device and method for locally reinforced beam with different cross sections |
| CN113941035A (en) * | 2021-09-18 | 2022-01-18 | 西安理工大学 | Degradable blood vessel stent magnesium alloy pipe for inhibiting tumor proliferation and preparation method thereof |
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