CN104174686B - A kind of seamed tube sheet production equipment of magnesium alloy and its production method - Google Patents
A kind of seamed tube sheet production equipment of magnesium alloy and its production method Download PDFInfo
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- CN104174686B CN104174686B CN201310200097.6A CN201310200097A CN104174686B CN 104174686 B CN104174686 B CN 104174686B CN 201310200097 A CN201310200097 A CN 201310200097A CN 104174686 B CN104174686 B CN 104174686B
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Abstract
The present invention relates to a kind of seamed tube sheet production equipment of magnesium alloy, including extruder, recipient, spread extrusion die, shaping dies and joint-cutting mould.Extruder includes the binder push rod for extruding power set and being fixed in extruding power set output end, recipient includes the recipient attemperator for extruding bobbin and being arranged on extruding bobbin, magnesium alloy blank is provided with extruding bobbin, spread extrusion die includes spreading die cavity, shaping dies includes tubulose die cavity, and joint-cutting mould includes comb die cavity and the joint-cutting part being arranged on comb cavity wall.The invention further relates to the production method of the said equipment, including the step such as blowing, temperature adjustment, binder, material cutting and discharge.Present invention employs that mould is spreaded, extrusion molding combines the wide magnesium alloy plate of the technique such as pipe fitting joint-cutting manufacture thickness of thin, template, process is simple, production efficiency are high, low cost, good product quality.
Description
Technical field
The present invention relates to the production equipment and its method of a kind of magnesium alloy plate, more particularly to a kind of employing extrusion molding
Means produce the device and method thereof of magnesium alloy plate, belong to non-ferrous metal plate manufacturing equipment field.
Background technology
Magnesium alloy plate has excellent rigid, intensity, damping property, thermal conductivity and electromagnetic wave shielding, is applicable at present
Most the new structural material of competition potential, is widely used in the fields such as automobile component, aerospace industry, 3C Product.Tradition
Magnesium alloy plate technique is prepared as other sheet metals are prepared mainly using the method for hot rolling, this method is first by magnesium alloy
Magnesium alloy slab is cast into, then magnesium alloy plate is made through multiple tracks heating, annealing, rolling process.Due to magnesium alloy materials original
Minor structure is close-packed hexagonal crystallographic system, is traditionally considered a kind of and is difficult to be plastically deformed and the poor metal material of pressure machining characteristics,
Especially in magnesium alloy sheet manufacture field, operation is various, and process is complicated, and sheet material following process is particularly deep stamping pole
Easy to crack, yield rate is low, causes the production cost height of Magnesium Alloy Sheet Parts, its market price to be far above aluminium alloy panels, limit
The range of application of Magnesium Alloy Sheet Parts, such as in the popularization and application of 3C Product and automobile industry.In order to solve the above problems, in the industry
Extrusion process production magnesium alloy plate is being explored, specifically magnesium alloy slab is being squeezed into by large-tonnage press accordingly
Cut deal, then magnesium alloy sheet is processed into by heating for multiple times, annealing, multiple tracks rolling, although this production technology changes and makes
Some shortcomings brought with magnesium alloy blank hot-rolling method, but to be processed into magnesium alloy sheet still need to heating for multiple times, annealing, rolling
Operation, thus the production cost of magnesium alloy sheet is still very high, and quality is still difficult to control to, and can not meet large-scale industrial production
Demand.
The content of the invention
The seamed tube sheet production equipment of magnesium alloy of the present invention and its production method disclose new production equipment scheme, employ
Mould is spreaded, extrusion molding combines the wide magnesium alloy plate of the techniques such as pipe fitting joint-cutting manufacture thickness of thin, template, is solved traditional magnesium and is closed
Golden plate production in rolling mill practice bring complex process, low production efficiency, high cost the problems such as.
The seamed tube sheet production equipment of magnesium alloy of the present invention includes extruder 100, recipient 200, spread extrusion die 300, shaping
Mould 400 and joint-cutting mould 500.Extruder 100 includes extruding power set and is fixed in extruding power set output end
Binder push rod 110, recipient 200 include the recipient attemperator 210 for extruding bobbin and being arranged on extruding bobbin, recipient
Magnesium alloy blank is provided with pipe, spread extrusion die 300 includes spreading die cavity, spreads the latus rectum of the latus rectum more than extruding bobbin of die cavity,
Shaping dies 400 includes tubulose die cavity, and joint-cutting mould 500 includes comb die cavity and the joint-cutting part being arranged on comb cavity wall
510.110 top pressure end of binder push rod is closely slidably matched with 200 feeding port of recipient, 200 discharging opening of recipient and spread extrusion die
The closed connection of 300 charging apertures, 300 discharging opening of spread extrusion die is closed with 400 charging aperture of shaping dies to be connected, and shaping dies 400 goes out
Material mouth is closed with 500 charging aperture of joint-cutting mould to be connected, and magnesium alloy blank is pushed into the type successively of spreading at binder push rod 110 top pressure end
Chamber, tubulose die cavity and comb die cavity form magnesium alloy base pipe, and magnesium alloy base pipe forms magnesium alloy seamed pipe through joint-cutting part 510
Plate.
The production method of the seamed tube sheet production equipment of magnesium alloy of the present invention includes step：(1) magnesium alloy blank is processed into
380 DEG C or so are preheated to after the shape of suitable recipient pipe volume size, extruding bobbin, adjustment binder push rod top pressure end is put into
Position so that top pressure side pressure reality magnesium alloy blank；(2) open and be arranged on extruding bobbin, the guarantor spreaded on die cavity and tubulose die cavity
Warm device so that the temperature in extruding bobbin maintains 380 DEG C～400 DEG C, and the temperature for spreading die cavity and tubulose die cavity is maintained
400 DEG C or so, open the circulating cooling liquid being arranged in comb cavity wall so that the temperature in comb die cavity maintains 300 DEG C
Below；(3) extruder is opened, the magnesium alloy blank extruded in bobbin is urged to and is spreaded in die cavity by binder push rod, magnesium alloy base
Material spread in die cavity accumulate compacting after enter tubular-type chamber formed magnesium alloy base pipe；(4) magnesium alloy base pipe is under pressure
Into after comb die cavity, Jing is arranged on the joint-cutting part on comb die cavity inwall and forms the seamed tube sheet of magnesium alloy；(5) magnesium alloy has
Slit-tube plate Jing combs die cavity discharges production equipment.
The seamed tube sheet production equipment of magnesium alloy of the present invention and its production method employ that mould is spreaded, extrusion molding combines pipe
The wide magnesium alloy plate of the techniques such as part joint-cutting manufacture thickness of thin, template, process is simple, production efficiency are high, low cost, product quality
It is good.
Description of the drawings
Fig. 1 is the seamed tube sheet production equipment structural representation of magnesium alloy of the present invention.
In Fig. 1,100 is extruder, and 110 is binder push rod, and 200 is recipient, and 210 is recipient attemperator, and 300 are
Spread extrusion die, 310 is spread extrusion die attemperator, and 400 is shaping dies, and 410 is shaping dies attemperator, and 500 is joint-cutting
Mould, 510 is joint-cutting part, and 520 is circulating cooling liquid passage, and 530 is cooled gas path.
Specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in figure 1, the seamed tube sheet production equipment schematic diagram of magnesium alloy of the present invention.The seamed tube sheet production equipment bag of magnesium alloy
Include extruder 100, recipient 200, spread extrusion die 300, shaping dies 400 and joint-cutting mould 500.Extruder 100 includes extruding
Power set and the binder push rod 110 being fixed in extruding power set output end, recipient 200 include extruding bobbin and setting
Recipient attemperator 210 on extruding bobbin, is provided with magnesium alloy blank in extruding bobbin, and spread extrusion die 300 includes spreading
Die cavity, spreads the latus rectum of the latus rectum more than extruding bobbin of die cavity, and shaping dies 400 includes tubulose die cavity, and joint-cutting mould 500 includes
Comb die cavity and the joint-cutting part 510 being arranged on comb cavity wall.110 top pressure end of binder push rod and 200 feeding port of recipient
Closely be slidably matched, 200 discharging opening of recipient is closed with 300 charging aperture of spread extrusion die to be connected, 300 discharging opening of spread extrusion die with into
The closed connection of 400 charging aperture of shape mould, 400 discharging opening of shaping dies is closed with 500 charging aperture of joint-cutting mould to be connected, binder push rod
Magnesium alloy blank is pushed into by 110 top pressure ends successively spreads die cavity, tubulose die cavity and comb die cavity formation magnesium alloy base pipe, and magnesium is closed
Golden base pipe forms the seamed tube sheet of magnesium alloy through joint-cutting part 510.
The section of blank is expanded before magnesium alloy blank is pressed into tubulose die cavity by the magnesium alloy plate larger in order to produce width
Greatly, so can effectively increase the perimeter of section of magnesium alloy base pipe, broader magnesium alloy plate is obtained after magnesium alloy base pipe joint-cutting.
It is exactly that to spread die cavity latus rectum be to extrude 1 times～1.3 times of bobbin latus rectum specific to this programme.Above scheme causes obtained magnesium
Alloy sheets width is 4 times of magnesium alloy blank diameter or so, increase effectively the width upper limit of magnesium alloy plate.
In order to produce the magnesium alloy plate of different-thickness, the concrete needs of different application occasion are met, and this programme is by control
Realizing controlling the thickness range of magnesium alloy pipe, the die cavity thickness of specifically tubulose die cavity is the die cavity thickness of tubulation shape die cavity
0.5mm～3mm.According to the different shaping dies of production task different choice, only need to change with phase when production task is changed
Answer the seamed tube sheet of magnesium alloy of the shaping dies of size die cavity thickness, convenient batch production different-thickness and model.
This programme is the shape formulated will to be reinvented into after magnesium alloy blank crimp using extruder, in order that plasticity
Deformation is smooth, and 380 DEG C～400 DEG C are warming up to before blank inserts recipient, that is, ensure extruding and be plastically deformed
Journey will be maintained in the range of said temperature, and in order to realize above-mentioned requirements, the spread extrusion die 300 of this programme also includes being arranged on spreading
Spread extrusion die attemperator 310 on die cavity, shaping dies 400 also include the shaping dies insulation dress being arranged on tubulose die cavity
Put 410.Attemperator is set up on each mould and ensure that magnesium alloy blank plastic deformation is carried out in optimum temperature interval, improve
Production efficiency and product quality.Above-mentioned each attemperator can adopt design generally in the art, such as using electric heating piece
Heating and thermal insulation etc..
The above-mentioned extruding of magnesium alloy base pipe Jing discharged from tubulose die cavity and the process of insulation, temperature are generally kept in 300 DEG C
More than, in order to reduce the temperature of base pipe so as to be conveniently processed further processing and slow down base pipe strong with air oxidation reaction
Degree, generally arranges cooling device in comb die cavity, and specifically joint-cutting mould 500 also includes cooling device, and cooling device includes
The circulating cooling liquid passage 520 being arranged in comb cavity wall, is connected with the coolant for circulating in circulating cooling liquid passage.For
Further strengthen cooling effect, prevent magnesium alloy base pipe that oxidation reaction occurs with air, this programme may be used also on the basis of the above
To introduce inertia cooling gas, specifically cooling device also includes the cooled gas path 530 through comb cavity wall, cools down gas
Cooling gas are connected with body passage, and cooling gas are preferably nitrogen.The introducing of cooling nitrogen not only strengthens cooling effect, makes
The temperature for obtaining magnesium alloy base pipe is down to less than 300 DEG C, but also has completely cut off the intervention of air, it is ensured that the seamed tube sheet of magnesium alloy
Quality.
The equipment of this programme production magnesium alloy plate employs multiple attemperators, during blank is constantly plastically deformed
The fluctuation range of temperature is maintained, this requires that the flowing velocity of tube sheet and heating and thermal insulation dynamics coordinate, and maintains pressure, speed and temperature
The balance coordination of degree parameter, in order to reach above-mentioned technical purpose, the seamed tube sheet production equipment of this programme magnesium alloy also includes intelligence
Control system, intelligence control system include PLC, pressure control module, rate control module, temperature control modules and prison
Control port, pressure control module will monitor extruding bobbin, spread the pressure signal that die cavity, tubulose die cavity and extruder 100 are obtained
Send PLC to, rate control module sends the top pressure rate signal that monitoring extruder 100 is obtained to PLC,
Temperature control modules will monitor extruding bobbin, spread the temperature signal that die cavity, tubulose die cavity and comb die cavity obtain sends PLC to
Controller, PLC send the pressure signal for receiving, rate signal and temperature signal to monitoring port, operating personnel
The working condition of the pressure, speed and temperature information adjusting device that are shown according to monitoring port.The circuit module that above is referred to and
Electronic devices and components can adopt design generally in the art and type selecting standard, it is also possible to need to select special according to specific design
Fixed scheme.The introducing of intelligent automatic-control system so that the control to machine parameters has broken away from what artificial experience control brought
Error and error, improve the production efficiency and product quality of equipment.
Present invention additionally comprises the production method of the seamed tube sheet production equipment of above-mentioned magnesium alloy, including step：
380 DEG C or so are heated to after magnesium alloy blank is processed into the shape of suitable recipient pipe volume size, are put into crowded
Pressure cylinder pipe, adjusts binder push rod top pressure end position so that top pressure side pressure reality magnesium alloy blank.Blank can be diameter of section
The cylindrical base of 150mm, high 300mm.In order that magnesium alloy is more also easy to produce plastic deformation, should occur to be plastically deformed in blank
Before be maintained within the scope of a favourable temperature, while plastic deformation be one with blank shape change dynamic process, base
Material is extruded and advances through all kinds of die cavities, in order that blank avoids producing larger friction resistance with cavity wall during advance
Power, it is ensured that production is smoothed out, after should first injecting appropriate glass lubricant, then magnesium alloy blank is put in extruding bobbin
Enter and extrude bobbin, so effectively reduce with the friction of cavity wall during the pressurized movement of blank so that magnesium-alloy tube squeeze
Go out speed up to 1m/mi n～2m/mi n.
Unlatching is arranged on extruding bobbin, the attemperator spreaded on die cavity and tubulose die cavity so that the temperature in extruding bobbin
Degree maintains 380 DEG C～400 DEG C, and the temperature for spreading die cavity and tubulose die cavity maintains 400 DEG C or so, opens and is arranged on comb type
Circulating cooling liquid in cavity wall so that the temperature in comb die cavity maintains less than 300 DEG C.Magnesium alloy is compared under a kind of normality
Active material, is easily reacted with the air (oxygen) for contacting in the range of said temperature, affects product quality, in order to simultaneous
Turn round and look at magnesium alloy plastic deformation, following process and avoid the factors such as above-mentioned negatively reaction, be smoothly plastically deformed in guarantee magnesium alloy
On the premise of, magnesium alloy temperature is reduced using the scheme of follow-up cooling, the purpose for being easy to process and mitigate response intensity is reached, together
When, in order to preferably realize this scheme, on the basis of above-mentioned means, can also simultaneously using doing that cooling gas are lowered the temperature
Method, specifically simultaneously opens the cooling gas being arranged in comb cavity wall, and above-mentioned cooling gas are nitrogen, inertia cooling gas
Introducing not only acted as the effect of cooling magnesium alloy, but also in type inner cavity insulation air, it is ensured that the quality of magnesium-alloy tube.
Extruder is opened, the magnesium alloy blank extruded in bobbin is urged to and is spreaded in die cavity by binder push rod, magnesium alloy base
Material spread in die cavity accumulate compacting after enter tubular-type chamber formed magnesium alloy base pipe.Spreading in die cavity, magnesium alloy blank
Section has obtained effective expansion, and its section latus rectum can increase to 1.3 times or so of blank diameter in extruding bobbin, so as to increase
The width of final products magnesium alloy plate.Tubulose die cavity is the space of a tubular, according to requirement of the manufacturing parameter to thickness of slab, tubulose
The thickness of die cavity can be selected between 0.5mm～3mm.
Magnesium alloy base pipe is arranged on the joint-cutting part on comb die cavity inwall into Jing after comb die cavity under pressure
Form the seamed tube sheet of magnesium alloy.The die cavity inwall of comb die cavity is provided with cutting knife, and the position of cutting knife is located at magnesium-alloy tube discharge
On passage, magnesium-alloy tube is cut while discharging and cracks, and it is ready to be that pipe is launched into slab by next step.
The seamed tube sheet Jing combs die cavity of magnesium alloy discharges production equipment.After the magnesium alloy seamed pipe of discharge launches, width is reachable
600mm or so, thickness range is in 0.5mm～3mm.
The seamed tube sheet production equipment of magnesium alloy of this programme and its production method adopt plastic extruding deformation and built-in die cavity
Scheme manufacture magnesium alloy plate, using the relation of intelligent automatic-control system call interception extruding force, speed and temperature so that machine protect
Hold in preferable working condition, the width that method and apparatus increases magnesium alloy plate is opened up using wide continuation, using filling glass lubrication
Harmful friction that the method for agent is produced in reducing extrusion process, completes magnesium alloy using built-in slot part inside die cavity
The slot operation of pipe, and technique and the qualitative problem for separately cutting that stitched open band is come is avoided, it is cold using coolant and inertia
The magnesium alloy seamed pipe temperature of discharge is not only down to less than 300 DEG C, and also achieves type by the scheme that but gas is used in combination
The additional technical effect of inner cavity insulation air, it is to avoid magnesium alloy materials are oxidized, overcomes all present in magnesium alloy plate production
Many difficult points, gained magnesium alloy plate internal grain are fine and close, compare traditional rolling mill practice and not only simplify processing step, and save
The energy, productivity ratio and product quality all increase, with prominent substantive distinguishing features and significant progress.
The seamed tube sheet production equipment of magnesium alloy of this programme and its production method are not limited to embodiment disclosure, real
The technical scheme occurred in applying example can be with individualism, it is also possible to mutually include, and those skilled in the art are combined according to this programme
The simple alternative that common knowledge is made falls within the scope of this programme.
Claims (10)
1. a kind of seamed tube sheet production equipment of magnesium alloy, is characterized in that including extruder (100), recipient (200), spread extrusion die
(300), shaping dies (400) and joint-cutting mould (500), extruder (100) is including extruding power set and is fixed on described squeezing
The binder push rod (110) in power apparatus output end is pressed, recipient (200) is including extruding bobbin and is arranged on the extruding bobbin
On recipient attemperator (210), it is described extruding bobbin in be provided with magnesium alloy blank, spread extrusion die (300) is including the type of spreading
Chamber, latus rectum of the latus rectum for spreading die cavity more than the extruding bobbin, shaping dies (400) is including tubulose die cavity, lancing die
Tool (500) includes comb die cavity and the joint-cutting part (510) being arranged on the comb cavity wall；Binder push rod (110) top pressure
End is closely slidably matched with recipient (200) feeding port, and recipient (200) discharging opening is closed with spread extrusion die (300) charging aperture
Connection, spread extrusion die (300) discharging opening is closed with shaping dies (400) charging aperture to be connected, shaping dies (400) discharging opening with cut
The closed connection of slit die tool (500) charging aperture, the magnesium alloy blank is pushed into institute by binder push rod (110) the top pressure end successively
State and spread die cavity, tubulose die cavity and comb die cavity formation magnesium alloy base pipe, the magnesium alloy base pipe is through joint-cutting part (510) shape
Into the seamed tube sheet of magnesium alloy.
2. the seamed tube sheet production equipment of magnesium alloy according to claim 1, it is characterised in that the die cavity latus rectum that spreads is
More than 1 times～1.3 times of the extruding bobbin latus rectum, not comprising 1 times.
3. the seamed tube sheet production equipment of magnesium alloy according to claim 1 and 2, it is characterised in that the tubulose die cavity
Die cavity thickness is 0.5mm～3mm.
4. the seamed tube sheet production equipment of magnesium alloy according to claim 3, it is characterised in that spread extrusion die (300) is also wrapped
Include and be arranged on the spread extrusion die attemperator (310) spreaded on die cavity, shaping dies (400) also includes being arranged on the pipe
Shaping dies attemperator (410) on shape die cavity.
5. the seamed tube sheet production equipment of magnesium alloy according to claim 4, it is characterised in that joint-cutting mould (500) is also wrapped
Cooling device is included, the cooling device includes the circulating cooling liquid passage (520) being arranged in the comb cavity wall, described to follow
The coolant for circulating is connected with ring cooling passage.
6. the seamed tube sheet production equipment of magnesium alloy according to claim 5, it is characterised in that the cooling device also includes
Through the cooled gas path (530) of the comb cavity wall, in the cooled gas path, cooling gas are connected with.
7. the seamed tube sheet production equipment of magnesium alloy according to claim 6, it is characterised in that the seamed tube sheet of the magnesium alloy
Production equipment also includes intelligence control system, and the intelligence control system includes PLC, pressure control module, speed control
Molding block, temperature control modules and monitoring port, the pressure control module will monitor the extruding bobbin, spread die cavity, pipe
The pressure signal that shape die cavity and extruder (100) are obtained sends the PLC to, and the rate control module will be monitored and be squeezed
The top pressure rate signal that press (100) is obtained sends the PLC to, and the temperature control modules will monitor the extruding
Bobbin, spread the temperature signal that die cavity, tubulose die cavity and comb die cavity obtain and send the PLC, the PLC controls to
Device sends the pressure signal for receiving, rate signal and temperature signal to the monitoring port, and operating personnel are according to the prison
The working condition of pressure, speed and temperature information adjusting device that control port shows.
8. the production method of the seamed tube sheet production equipment of magnesium alloy according to claim 6, is characterized in that including step：
(1) 380 DEG C are preheated to after magnesium alloy blank being processed into the shape of suitable recipient pipe volume size, recipient is put into
Pipe, adjusts binder push rod top pressure end position so that top pressure side pressure reality magnesium alloy blank；
(2) open and be arranged on extruding bobbin, the attemperator spreaded on die cavity and tubulose die cavity so that the temperature in extruding bobbin
380 DEG C～400 DEG C are maintained, the temperature for spreading die cavity and tubulose die cavity maintains 400 DEG C, opens and is arranged in comb cavity wall
Circulating cooling liquid so that the temperature in comb die cavity maintains less than 300 DEG C；
(3) extruder is opened, the magnesium alloy blank extruded in bobbin is urged to and is spreaded in die cavity by binder push rod, magnesium alloy blank
Tubular-type chamber formation magnesium alloy base pipe enter after accumulation compacting in die cavity being spreaded；
(4) magnesium alloy base pipe is arranged on the joint-cutting part shape on comb die cavity inwall under pressure into Jing after comb die cavity
Into the seamed tube sheet of magnesium alloy；
(5) the seamed tube sheet Jing combs die cavity of magnesium alloy discharges production equipment.
9. method according to claim 8, it is characterised in that in step (1), first injects appropriate in extruding bobbin
After glass lubricant, then magnesium alloy blank is put into into extruding bobbin.
10. method according to claim 9, it is characterised in that in step (2), while open being arranged on comb die cavity
Cooling gas in wall, the cooling gas are nitrogen.
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| CN201310200097.6A CN104174686B (en) | 2013-05-24 | 2013-05-24 | A kind of seamed tube sheet production equipment of magnesium alloy and its production method |
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| CN104174686B true CN104174686B (en) | 2017-04-05 |
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| JPS6061132A (en) * | 1983-09-13 | 1985-04-08 | Hitachi Ltd | Plastic working device of metallic product |
| US5167138A (en) * | 1987-12-31 | 1992-12-01 | Southwire Company | Conform extrusion process and apparatus |
| GB9720607D0 (en) * | 1997-09-30 | 1997-11-26 | T & N Technology Ltd | Method and apparatus for continuous forging of descrete atricles |
| CN100431729C (en) * | 2006-09-29 | 2008-11-12 | 大连康丰科技有限公司 | Continuously squeezing method and apparatus for expanding extrusion |
| CN1943892A (en) * | 2006-10-13 | 2007-04-11 | 大连康丰科技有限公司 | Continuous extruding method with pre-moulding and special device |
| CN101607271A (en) * | 2009-07-21 | 2009-12-23 | 大连康丰科技有限公司 | The continuous squeezing method and the equipment that have the stacked assembling die of reversed cone angle |
| CN102688907B (en) * | 2011-03-24 | 2014-10-29 | 大连交通大学 | System and method for continuous extrusion production of fine-grain magnesium alloy strip |
| CN103042060B (en) * | 2012-10-15 | 2015-06-17 | 孙逸成 | Production line for preparing magnesium alloy sheets by semi-melt extrusion method and technology of production line |
| CN102909231A (en) * | 2012-10-26 | 2013-02-06 | 昆山集智成模具有限公司 | Seamless tubing extrusion device |
| CN103008377B (en) * | 2012-12-21 | 2015-10-07 | 重庆市科学技术研究院 | A kind of novel magnesium alloy plate extruding formation process |
| CN203316511U (en) * | 2013-05-24 | 2013-12-04 | 孙逸成 | Production equipment of magnesium alloy seamed pipe plate |
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