CN107597942B - A kind of preparation method and its device of high strength alumin ium alloy tubing members - Google Patents
A kind of preparation method and its device of high strength alumin ium alloy tubing members Download PDFInfo
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- CN107597942B CN107597942B CN201711091592.2A CN201711091592A CN107597942B CN 107597942 B CN107597942 B CN 107597942B CN 201711091592 A CN201711091592 A CN 201711091592A CN 107597942 B CN107597942 B CN 107597942B
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Abstract
The invention discloses the preparation methods and its device of a kind of high strength alumin ium alloy tubing members, and method includes S1: will be put into lower die after high strength alumin ium alloy tubing prebuckling；S2: the granule medium after preheating is loaded into pipe by granule medium and is packed into；S3: after the hull-skin temperature of high strength alumin ium alloy tubing reaches swelling pressure temperature, medium pressure head is pushed, and keeps constant pressure after making high strength alumin ium alloy pipe deformations to pre- bulging shape；S4: sliding die molding, the high strength alumin ium alloy tubing after making pre- bulging are deformed into target shape under sliding die and the collective effect of medium pressure head.Device includes lower die and upper mold, lower die is respectively equipped with a sliding die for placing high strength alumin ium alloy tubing, the two sides of high strength alumin ium alloy tubing, and upper mold is arranged on the downside of upper die holder, upper die holder is equipped with bearing material cylinder, and bearing material cylinder is aligned with the medium pressure head being slideably positioned on intermediate slider.The present invention can make high strength alumin ium alloy pipe be easier to mold molding, and improve the dimensional accuracy of high strength alumin ium alloy tubing members.
Description
Technical field
The present invention relates to pressure molding technique fields, more particularly to a kind of preparation method of high strength alumin ium alloy tubing members
And its device.
Background technique
In fields such as aircraft, spacecraft and automobiles, mitigates weight and saving material and running energy is that people are long
One of the trend for target and the modern advanced manufacturing technique development that phase pursues.Especially in the automotive industry, due to fuel and
The cost reason of raw material makes the lightweight of vehicle structure seem and becomes more and more important.Other than using light material, mitigate the another of weight
One main path is exactly that the strong components such as " real with empty generation " and variable cross-section are used in structure.Can both it be mitigated using hollow structure
Weight savings material, and the strength and stiffness of material can be made full use of.
Aluminum alloy materials have that density is low, specific strength is high, the high-quality characteristic such as heat-resisting, wear-resisting, anti-corrosion, are widely used in navigating
The fields such as empty space flight, auto industry and petrochemical industry.High-strength aluminum alloy material mainly includes 6xxx aluminium alloy and 7xxx aluminium alloy
Material, and the aluminium alloy of both series is heat-treatable strengthened aluminum alloy material.But high strength alumin ium alloy pipe fitting deformation at room temperature
Ability is poor, can not shape complicated shape part, significantly limits its application range.Meanwhile using conventional rigid Mo Neigao
The high strength alumin ium alloy component of platen press forming is easy the influence limited by die size and aluminum alloy materials are sprung back, formation of parts
Dimensional accuracy it is generally lower, and the once-forming technique (punching press, drawing etc.) of tradition processes part forming limit phase obtained
To relatively low.Therefore, it is necessary to develop a kind of manufacturing process for being easier to the hollow light body component of molding high-strength aluminum alloy material.
Summary of the invention
It is above-mentioned to solve the object of the present invention is to provide the preparation method and its device of a kind of high strength alumin ium alloy tubing members
Problem of the existing technology makes high strength alumin ium alloy pipe be easier to mold molding, and improves the ruler of high strength alumin ium alloy tubing members
Very little precision.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of preparation methods of high strength alumin ium alloy tubing members, include the following steps:
S1: it will be put into lower die after high strength alumin ium alloy tubing prebuckling；
S2: intermediate slider and medium pressure head push, until upper die holder and bearing material cylinder and the lower die and the high-strength aluminium close
Granule medium after preheating is loaded the pipe loading high strength alumin ium alloy tubing by granule medium and described held by the molding of golden tubing
In barrel, the granule medium is retracted after the completion of loading and loads pipe；
S3: detecting the hull-skin temperature of the high strength alumin ium alloy tubing using infrared temperature measurement apparatus, closes in the high-strength aluminium
After the hull-skin temperature of golden tubing reaches swelling pressure temperature, medium pressure head is pushed, and makes the high strength alumin ium alloy pipe deformations to pre-expanding
Pressure is kept constant after shape shape；
S4: sliding form frame drives sliding die mobile to the high strength alumin ium alloy tubing after pre- bulging and molds, and makes pre-expanding
The high strength alumin ium alloy tubing after shape is deformed into target shape under the sliding die and the collective effect of the medium pressure head,
Medium pressure head is retracted after a certain period of time for pressure maintaining, can be opened and be taken out high strength alumin ium alloy tubing members.
Preferably, the preheating temperature of the hot granule medium is 400 DEG C~600 DEG C.
Preferably, the swelling pressure temperature is 250 DEG C~400 DEG C.
Preferably, pressure maintaining 1min~2min after the high strength alumin ium alloy pipe deformations to target shape after pre- bulging.
Preferably, the granule medium is silicon nitride ceramic ball.
Preferably, the diameter of the silicon nitride ceramic ball be 0.4mm~3.0mm, bending strength be 900MPa~
1200MPa, fracture toughness range are 5MPa~6MPa, and hardness is not less than 1380HV.
Preferably, the diameter of the silicon nitride ceramic ball is 0.5mm~0.8mm.
Preferably, when die sinking, the sliding form frame first drives the sliding die to far from the high strength alumin ium alloy tubing structure
The direction of part is mobile, and then the intermediate slider drives upper die holder and bearing material cylinder to far from the lower die and the high strength alumin ium alloy
The direction of tubing members is mobile.
The present invention also provides a kind of preparation facilities of high strength alumin ium alloy tubing members, including lower die and upper mold, under described
On fixed die holder, the fixed die holder is fixedly arranged on mould bases for mould setting, and the lower die is for placing high strength alumin ium alloy tubing, institute
The two sides for stating high strength alumin ium alloy tubing are respectively equipped with a sliding die, and the sliding die can drive the relatively described height by sliding form frame
Strength aluminum alloy tubing is mobile；
The upper mold is arranged on the downside of upper die holder, and the upper die holder is fixedly arranged on intermediate slider, and the upper die holder is equipped with
Bearing material cylinder, the bearing material cylinder are aligned with the medium pressure head being slideably positioned on intermediate slider, the intermediate slider and granule medium
It loads pipe to be slidably connected, the granule medium loads pipe and can load into the bearing material cylinder and the high strength alumin ium alloy tubing
Granule medium；
It is equipped in the fixed die holder, the sliding die and the upper mold for detecting the high strength alumin ium alloy tubing table
The infrared temperature measurement apparatus of face temperature.
Preferably, the sliding form frame is connected by sliding guide with the fixed module sliding being fixedly arranged on the fixed form
It connects, the lower die is bolted with the fixed module；The fixed die holder, the lower die, the sliding die and described
Cooling line is equipped with inside upper mold.
Preferably, the granule medium is silicon nitride ceramic ball.
Preferably, the diameter of the silicon nitride ceramic ball be 0.4mm~3.0mm, bending strength be 900MPa~
1200MPa, fracture toughness range are 5MPa~6MPa, and hardness is not less than 1380HV.
Preferably, the diameter of the silicon nitride ceramic ball is 0.5mm~0.8mm.
The present invention achieves following technical effect compared with the existing technology:
Based on the principle that high strength alumin ium alloy tubing can be significantly improved with the raising of forming temperature, forming property, the present invention
Provide the preparation method and its device of a kind of high strength alumin ium alloy tubing members.The present invention passes through hot to being passed through inside tubing
Granule medium carries out granule medium bulging to high strength alumin ium alloy tubing when tubing temperature reaches forming temperature, and combines sliding
Mould carries out external load to the preform pipe of the granule medium internal pressure comprising warm, finally obtains target pipe fitting finished product.
The present invention combines the solids pressure warm forming of high strength alumin ium alloy tubing with sliding die pressure forming, changes
Into the simple bulging deformation pattern of existing pipe fitting internal high pressure forming, the moulding side of mold active movement mold is realized
Method, can greatly improve the mold performance of high strength alumin ium alloy pipe fitting forming process, thus solve original internal high pressure forming only according to
By super-pressure force pipe bulging be not easy mold the problem of, make using compared with low pressure Accurate Shaping pipe fitting local feature become can
Can, reduce requirement of the production technology to external equipment and sealing system.In addition, stable under the high temperature conditions using granule medium
Mechanically and chemically performance and the good heating conduction of high-strength aluminum alloy material, the granule medium after heating is loaded to high-strength
Aluminium alloy pipe, by the heat transfer between granule medium and high strength alumin ium alloy tubing by high strength alumin ium alloy tubing be heated to temperature at
Temperature needed for shape, has saved energy consumption, improves production efficiency.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is that the preparation facilities of high strength alumin ium alloy tubing members of the present invention is illustrated in the front view structure of the first working condition
Figure；
Fig. 2 is the schematic cross-sectional view of A-A in Fig. 1；
Fig. 3 is that the preparation facilities of high strength alumin ium alloy tubing members of the present invention is illustrated in the front view structure of the second working condition
Figure；
Fig. 4 is the schematic cross-sectional view of A-A in Fig. 3；
Fig. 5 is that the preparation facilities of high strength alumin ium alloy tubing members of the present invention is illustrated in the front view structure of third working condition
Figure；
Fig. 6 is the schematic cross-sectional view of A-A in Fig. 5；
Fig. 7 is the schematic cross-sectional view of B-B in Fig. 5；
Fig. 8 is that the preparation facilities of high strength alumin ium alloy tubing members of the present invention is illustrated in the front view structure of the 4th working condition
Figure；
Fig. 9 is the schematic cross-sectional view of A-A in Fig. 8；
Figure 10 is the schematic cross-sectional view of B-B in Fig. 8；
Figure 11 is that the preparation facilities of high strength alumin ium alloy tubing members of the present invention is illustrated in the front view structure of the 5th working condition
Figure；
Figure 12 is the schematic cross-sectional view of A-A in Figure 11；
Figure 13 is the schematic cross-sectional view of B-B in Figure 11；
Figure 14 is that the preparation facilities of high strength alumin ium alloy tubing members of the present invention is illustrated in the front view structure of the 6th working condition
Figure；
Figure 15 is the schematic cross-sectional view of A-A in Figure 14；
Figure 16 is the schematic cross-sectional view of B-B in Figure 14；
Figure 17 is that the preparation facilities of high strength alumin ium alloy tubing members of the present invention is illustrated in the front view structure of the 7th working condition
Figure；
Figure 18 is the schematic cross-sectional view of A-A in Figure 17；
Wherein: 1- lower die, 2- upper mold, the fixed die holder of 3-, 4- mould bases, 5- sliding die, 6- sliding form frame, 7- upper die holder, 8-
Intermediate slider, 9- bearing material cylinder, 10- medium pressure head, 11- granule medium, which loads, manages, 12- infrared temperature measurement apparatus, 13- sliding guide,
14- fixed module, 15- cooling line, 16- granule medium.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is above-mentioned to solve the object of the present invention is to provide the preparation method and its device of a kind of high strength alumin ium alloy tubing members
Problem of the existing technology makes high strength alumin ium alloy pipe be easier to mold molding, and improves the ruler of high strength alumin ium alloy tubing members
Very little precision.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Fig. 1-18: present embodiments providing a kind of preparation facilities of high strength alumin ium alloy tubing members, including lower die 1
With upper mold 2, lower die 1 is connect by bolt with fixed die holder 3 and fixed module 14, and the fixed die holder 3 is fixedly arranged on mould bases 4,
The lower die 1 is for placing high strength alumin ium alloy tubing.The two sides of the high strength alumin ium alloy tubing are respectively equipped with a sliding die 5, institute
Stating sliding die 5 can be driven by sliding form frame 6 relative to high strength alumin ium alloy tubing movement, and sliding form frame 6 is by sliding oil cylinder
Cylinder rod driving, the cylinder body of sliding oil cylinder and mould bases 4 are connected, the sliding form frame 6 by sliding guide 13 be fixedly arranged on it is described solid
Fixed module 14 on solid plate is slidably connected, and sliding guide 13 can slide in the guide rod hole of fixed module 14, to ensure
Two sliding dies 5 can be molded accurately.
The setting of upper mold 2 is in 7 downside of upper die holder, and the upper die holder 7 is fixedly arranged on intermediate slider 8, on the upper die holder 7
Equipped with bearing material cylinder 9, the bearing material cylinder 9 is aligned with the medium pressure head 10 being slideably positioned on intermediate slider 8, intermediate slider 8 and Jie
Matter pressure head 10 can be moved up and down by hydraulic press or the driving of other press.The intermediate slider 8 loads pipe 11 with granule medium
It being slidably connected, granule medium loads pipe 11 and is communicated with granule medium accumulating tank, and granule medium accumulating tank has heating and heat preserving function,
It being capable of heated particle medium 16.The granule medium loads pipe 11 can be to the bearing material cylinder 9 and the high strength alumin ium alloy tubing
Middle filling granule medium 16.The granule medium 16 is silicon nitride ceramic ball, and the diameter of the silicon nitride ceramic ball is preferably
0.4mm~3.0mm, more preferably 0.5mm~0.8mm, bending strength are 900MPa~1200MPa, and fracture toughness range is
5MPa~6MPa, hardness are not less than 1380HV.
It is equipped in the fixed die holder 3, the sliding die 5 and the upper mold 2 for detecting the high strength alumin ium alloy pipe
The infrared temperature measurement apparatus 12 of material surface temperature.Inside the fixed die holder 3, the lower die 1, the sliding die 5 and the upper mold 2
It is equipped with cooling line 15, to accelerate the cooling velocity of high strength alumin ium alloy tubing and granule medium 16.
The present embodiment additionally provides a kind of preparation method of high strength alumin ium alloy tubing members, includes the following steps:
S1: it will be put into lower die 1 after high strength alumin ium alloy tubing prebuckling, as shown in Figs. 1-2；
S2: intermediate slider 8 and medium pressure head 10 push, until upper die holder 7 and bearing material cylinder 9 and the lower die 1 and the height
Granule medium 16 after preheating is loaded pipe 11 by granule medium and is packed into the high strength alumin ium alloy pipe by the molding of strength aluminum alloy tubing
In material and the bearing material cylinder 9, the granule medium is retracted after the completion of loading and loads pipe 11；The preheating of the hot granule medium 16
Temperature is preferably 400 DEG C~600 DEG C, as shown in fig. 3 to 7；
S3: detecting the hull-skin temperature of the high strength alumin ium alloy tubing using infrared temperature measurement apparatus 12, in the high-strength aluminium
After the hull-skin temperature of alloy pipe reaches swelling pressure temperature, medium pressure head 10 is pushed, and makes the high strength alumin ium alloy pipe deformations extremely
Pressure is kept constant after pre- bulging shape；The swelling pressure temperature is preferably 250 DEG C~400 DEG C, as seen in figs. 8-10；
S4: sliding form frame 6 drives sliding die 5 mobile to the high strength alumin ium alloy tubing after pre- bulging and molds, and makes pre-
The high strength alumin ium alloy tubing after bulging is deformed into target under the sliding die 5 and the collective effect of the medium pressure head 10
Shape, medium pressure head 10 is retracted after a certain period of time for pressure maintaining, can be opened and be taken out high strength alumin ium alloy tubing members, and the dwell time is preferred
For 1min~2min, as figs 11-13.
Wherein, the specific steps of die sinking are as follows: the sliding form frame 6 first drives the sliding die 5 to far from the high-strength aluminium
The direction of alloy pipe component is mobile, until sliding die 5 resets, as illustrated in figures 14-16, then in the drive of intermediate slider 8
Die holder 7 and bearing material cylinder 9 are mobile to the direction far from the lower die 1 and the high strength alumin ium alloy tubing members, until upper mold 2 is multiple
Position, as shown in figs. 17-18.
The setting requirements of each parameter are illustrated for processing wall thickness as the high strength alumin ium alloy tubing of 2.0mm below.
When high strength alumin ium alloy tubing is 6 line aluminium alloy, such as AA6061, the preheating temperature of granule medium 16 is preferably 500
DEG C~580 DEG C, most preferably 550 DEG C；Swelling pressure temperature is preferably 385 DEG C, and the pressure that medium pressure head 10 pushes is preferably 35MPa,
Dwell time is preferably 1min.
When high strength alumin ium alloy tubing is 7 line aluminium alloy, such as AA7075, the preheating temperature of granule medium 16 is preferably 420
DEG C~490 DEG C, most preferably 430 DEG C.Swelling pressure temperature is preferably 275 DEG C, and the pressure that medium pressure head 10 pushes is preferably 45MPa,
Dwell time is preferably 2min.
It should be understood that the present embodiment does not have particular/special requirement, main needle to the type of high strength alumin ium alloy tubing and source
To 6 series, 7 serial high strength alumin ium alloy tubing, mainly for thickness in 3mm tubing below, and the present embodiment is in prebuckling
Manufacturing process used does not have particular/special requirement, conventional pressure forming, pressure size preferably 30~50MPa.High-strength aluminium closes
Golden tubing prebuckling is put into shaping dies, and the present embodiment does not have particular/special requirement to pre-bend shape, generally can be according to target zero
Part size shape determines pre-bend shape.The present embodiment does not have particular/special requirement to pre- bulging shape, can be according to target pipe fitting shape
Shape design determines.
The present embodiment obtains following technical effect compared with the existing technology:
1, the simple bulging deformation pattern for changing existing pipe fitting internal high pressure forming, passes through 16 bulging of granule medium and pressure
Both forming technologies combine, and improve the mold performance of pipe fitting, and complicated shape abnormity can be shaped under lesser forming pressure
Section pipe fitting, production cost is cheap, and product design is flexible, dimensional accuracy is high.
2, using first pre- bulging, external pressure loading and shaping, such mode can shape pipe fitting office while holding pipe internal pressure afterwards
Portion's section feature is less than the diameter of original pipe, this makes this technique can adapt to the tubular element of increasingly complex cross sectional shape.
3, silicon nitride ceramic ball density is small, intensity is high, wear-and corrosion-resistant, and at a high temperature of 800 DEG C, intensity, hardness are constant, tool
Have a self-lubrication, guarantee that Forming Workpiece has good surface quality, can recycle, it is green and pollution-free, can with gram
Take the difficult sealing and the problem of load under the high temperature conditions of oil liquid, gas medium.
4, using the good heating conduction of high strength alumin ium alloy, the granule medium 16 after preheating is loaded into pipe, is passed through
Heating of pipe blank to warm working temperature is equivalent to heating of pipe blank process and forming by the heat transfer between granule medium 16 and pipe
A part of merging treatment of process improves production efficiency with energy saving.
Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
1. a kind of preparation facilities of high strength alumin ium alloy tubing members, it is characterised in that: including lower die and upper mold, the lower die setting
On fixed die holder, the fixed die holder is fixedly arranged on mould bases, and the lower die is described high-strength for placing high strength alumin ium alloy tubing
The two sides of aluminium alloy pipe are respectively equipped with a sliding die, and the sliding die can be driven the relatively described high-strength aluminium to close by sliding form frame
Golden tubing is mobile；
The upper mold is arranged on the downside of upper die holder, and the upper die holder is fixedly arranged on intermediate slider, and the upper die holder is equipped with bearing material
Cylinder, the bearing material cylinder are aligned with the medium pressure head being slideably positioned on the intermediate slider, the intermediate slider and granule medium
It loads pipe to be slidably connected, the granule medium loads pipe and can load into the bearing material cylinder and the high strength alumin ium alloy tubing
Granule medium；
It is equipped in the fixed die holder, the sliding die and the upper mold for detecting the high strength alumin ium alloy tube surfaces temperature
The infrared temperature measurement apparatus of degree.
2. the preparation facilities of high strength alumin ium alloy tubing members according to claim 1, it is characterised in that: the sliding form frame
It is slidably connected by sliding guide with the fixed module being fixedly arranged on the fixed die holder, the lower die and the fixed module are logical
It crosses and is bolted；Cooling line is equipped with inside the fixed die holder, the lower die, the sliding die and the upper mold.
3. a kind of high strength alumin ium alloy tubing of the preparation facilities based on high strength alumin ium alloy tubing members of any of claims 1 or 2
The preparation method of component, characterized by the following steps:
S1: it will be put into lower die after high strength alumin ium alloy tubing prebuckling；
S2: intermediate slider and medium pressure head push, until upper die holder and bearing material cylinder and the lower die and the high strength alumin ium alloy pipe
Granule medium after preheating is loaded pipe by granule medium and is packed into the high strength alumin ium alloy tubing and the bearing material cylinder by material molding
In, the granule medium is retracted after the completion of loading loads pipe；
S3: detecting the hull-skin temperature of the high strength alumin ium alloy tubing using infrared temperature measurement apparatus, in the high strength alumin ium alloy pipe
After the hull-skin temperature of material reaches swelling pressure temperature, medium pressure head is pushed, and makes the high strength alumin ium alloy pipe deformations to pre- bulging shape
Pressure is kept constant after shape；
S4: sliding form frame drives sliding die mobile to the high strength alumin ium alloy tubing after pre- bulging and molds, after making pre- bulging
The high strength alumin ium alloy tubing be deformed into target shape, pressure maintaining under the sliding die and the collective effect of the medium pressure head
Medium pressure head is retracted after a certain period of time, can be opened and be taken out high strength alumin ium alloy tubing members.
4. the preparation method of high strength alumin ium alloy tubing members according to claim 3, it is characterised in that: the hot particle
The preheating temperature of medium is 400 DEG C~600 DEG C.
5. the preparation method of high strength alumin ium alloy tubing members according to claim 3, it is characterised in that: the swelling pressure temperature
It is 250 DEG C~400 DEG C.
6. the preparation method of high strength alumin ium alloy tubing members according to claim 3, it is characterised in that: the institute after pre- bulging
State pressure maintaining 1min~2min after high strength alumin ium alloy pipe deformations to target shape.
7. the preparation method of high strength alumin ium alloy tubing members according to claim 3, it is characterised in that: the granule medium
For silicon nitride ceramic ball.
8. the preparation method of high strength alumin ium alloy tubing members according to claim 7, it is characterised in that: the silicon nitride pottery
The diameter of porcelain ball is 0.4mm~3.0mm, and bending strength is 900MPa~1200MPa, and fracture toughness range is 5MPa~6MPa,
Hardness is not less than 1380HV.
9. the preparation method of high strength alumin ium alloy tubing members according to claim 8, it is characterised in that: the silicon nitride pottery
The diameter of porcelain ball is 0.5mm~0.8mm.
10. the preparation method of high strength alumin ium alloy tubing members according to claim 3, it is characterised in that: described when die sinking
Sliding form frame first drives the sliding die mobile to the direction far from the high strength alumin ium alloy tubing members, then described intermediate sliding
Block drives the upper die holder and the bearing material cylinder mobile to the direction far from the lower die and the high strength alumin ium alloy tubing members.
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| CN201711091592.2A CN107597942B (en) | 2017-11-08 | 2017-11-08 | A kind of preparation method and its device of high strength alumin ium alloy tubing members |
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| JPH1119729A (en) * | 1997-07-03 | 1999-01-26 | Nissan Motor Co Ltd | Bulging device and bulging method |
| JP3206505B2 (en) * | 1997-08-06 | 2001-09-10 | 住友金属工業株式会社 | Hydraulic bulge processing method and hydraulic bulge processing apparatus for metal tube |
| JP4086216B2 (en) * | 1999-03-02 | 2008-05-14 | 株式会社エフテック | Hydroforming method of pipe material |
| CN100551575C (en) * | 2006-03-31 | 2009-10-21 | (株)星宇Hitech | Hydraulic forming press system and drawing method thereof |
| CN201376042Y (en) * | 2009-02-17 | 2010-01-06 | 宝山钢铁股份有限公司 | Hydraulic molding device |
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