CN109894519A - A kind of novel magnesium alloy abnormity component rushes-expanding composite forming method - Google Patents
A kind of novel magnesium alloy abnormity component rushes-expanding composite forming method Download PDFInfo
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- CN109894519A CN109894519A CN201910149524.XA CN201910149524A CN109894519A CN 109894519 A CN109894519 A CN 109894519A CN 201910149524 A CN201910149524 A CN 201910149524A CN 109894519 A CN109894519 A CN 109894519A
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Abstract
What the present invention provided a kind of novel magnesium alloy abnormity component rushes-expanding composite forming method, by reconditioning magnesium alloy plate, improves the surface quality of slab after rolling, reduces table fan roughness, reduces the frictional force between internal model and magnesium alloy plate；After the completion of interior external mold preheating, one-step forming at the beginning of realizing plate by the pressing of upper mold forms prefabricated blank；Oil circuit fuel feeding in inside cavity realizes that blank is bonded with outer mold cavity, completes the molding of magnesium alloy abnormity component.The present invention is by the way of punching-swollen combination forming, while retaining stamping forming high efficiency, effectively improve the problem of magnesium alloy Complex Different Shape molding component difficulty, the bottleneck of the fabulous punch forming difficulty for overcoming component complex region and shape acute variation transition position.
Description
Technical background
The present invention relates to magnesium alloy abnormity component forming field, particular content is a kind of novel magnesium alloy abnormity component
Punching-expanding composite forming method.
Technical background
With the development of science and technology, it is dirty to start the environment recognizing the finiteness of global resources and getting worse by people
It contaminates and is endangered to social bring, magnesium alloy is increasingly strong in loss of weight and lightweight domain requirement as most light Structural Engineering material
It is strong.Existing part lightweight approach mainly has following two: one, part itself is promoted using material mechanical performance, and use is low
The material of density high intensity；Two, the strong components such as " real with empty generation " and variable cross-section are used in structure, using hollow structure
The strength and stiffness of material can also be made full use of by mitigating weight saving material.Magnesium alloy abnormity component has both above two advantages,
In field of traffic urgent need, existing magnesium alloy abnormity component mostly based on casting, exists, processing efficiency is low, tissue defects and
The drawbacks such as poor mechanical property cause the properties of product of abnormity component poor, and segregation is serious, and wall thickness is thicker, and weight loss effect is undesirable.
Stamping technology is higher to the plasticity requirements of stamping material as efficient plastic forming technique；To inductile material
For (magnesium alloy), by the processing characteristics of stamping technology itself, (unhomogeneity of deformation, the arc transitions such as bent angle area wall thickness are relatively thin
Deng) fettered punching press effect is undesirable, it is unable to satisfy processing request of the scouring depth compared with high product, it is difficult to realize single pass or few passage
Punch forming.Meanwhile for complicated magnesium alloy shell component, the mode of texturing of punching press, it is difficult to realize regional area
Molding (e.g., radius of the radian smaller part and complicated shape transition area), cracking and drawing crack phenomenon are serious；In addition, the special-shaped structure in part
Part cavity shape is complicated and changeable, and stamping technology is difficult to form realization, by locking being able to molding internal model, it is difficult to demould.
Summary of the invention
For above situation, the technical problems to be solved by the present invention are: in punching course, it is thinned serious at fillet, after
Material tensile phenomenon, and complicated punching press abnormity component internal model locking problem are rushed in continuous punching press.
It is adopted the technical scheme that in order to solve the above technical problems, this law is bright: a kind of novel magnesium alloy abnormity structure is provided
Part rushes-expanding composite forming method, while retaining stamping forming high efficiency, rises in conjunction with liquid and is connected to fluid in moulding process
Between pressure the characteristics of being evenly distributed to improve the quality and lumber recovery of product reduce repeated heating hot activation effect between passage
Consume to the heating process between the influence and passage of material grains refinement, to the energy.
Technical solution provided herein, contact of the inside and outside mould lower edges with material in related punching-swollen equipment
Surface is embedded with carbon seal ring；Outer membrane is provided with the oil circuit that can be recycled, and can preheat external mold by high temperature fluid before punching press；Internal model
It is inside provided with oil inlet oil circuit, after the completion of stamping procedure, the swollen molding procedure of liquid is done directly by oil circuit in internal model；It can be according to specific
External mold is divided into multistage oil circuit by punching press demand, carries out subregion heating to external mold.
A kind of novel magnesium alloy abnormity component of the present invention rushes-expanding composite forming method, specific implementation process are as follows:
S1, reconditioning magnesium alloy plate is smooth to surface, and surface roughness is not less than 6.3, magnesium plate hydraulic giant or air gun punching after reconditioning
Wash clean need to be air-dried or be dried according to the slab of hydraulic giant cleaning, after dry to guarantee that blank enters the drying property of heating furnace
Plate thickness is 5~8mm；
S2, heating magnesium alloy plate to 350 DEG C~420 DEG C keep the temperature 10min and by punching-swollen equipment internal model and external mold heat
To 175 DEG C~230 DEG C heat preservation 30min, plate is placed on above external mold after the completion of heating, while internal model starts to fall, to material
Preliminary punch forming is carried out, the drawing velocity of internal model is 12~25mm/s；
S3, after preliminary punch forming, the master cylinder in internal model is in state of pressure keeping, to guarantee that internal model top edge and slab are remaining in one's ear
Sealing between material is close；Furthermore auxiliary oil circuit sealing valve is opened in internal model cylinder, and high-temperature, high pressure fluid is flowed by the hole system in internal model
In gap between internal model and plate, realize that the subsequent liquid of plate is expanded into type, until plate surface and external mold inner wall are bonded completely；
The laminating degree of the plate and external mold inner surface can constantly be acquired by the monitoring of auxiliary oil circuit oil pressure.
The swollen molding fluid of liquid is the warm hydraulic oil of band, and the fluid temperature (F.T.) of bulging work step (S3) is 180 DEG C~220 DEG C.
Magnesium alloy plate rolling mill practice early period for punching press are as follows: 12 m/min of mill speed, after three passages
The overall reduction of magnesium plate is 80%, and drafts per pass is respectively 30%, 30%, 20%.
Step S1 improves the surface quality of slab after rolling by reconditioning magnesium alloy plate, reduces table fan roughness, reduces
Frictional force between internal model and magnesium alloy plate improves the leakproofness of internal model top edge and slab in one's ear between clout；S2, internal model is to magnesium
The preliminary punch forming of sheet alloy: after the completion of interior external mold preheating, one-step forming at the beginning of realizing plate by the pressing of upper mold is formed prefabricated
Base；S3, Non-intermittent prefabricated blank liquid are expanded into type: oil circuit fuel feeding in inside cavity, realize that blank is bonded with outer mold cavity, complete magnesium alloy
The molding of abnormity component.
The beneficial effects of the present invention are: retaining the same of stamping forming high efficiency by the way of punching-swollen combination forming
When, the problem of magnesium alloy Complex Different Shape molding component difficulty is effectively improved, fabulous overcomes component complex region and shape
The bottleneck of the punch forming difficulty of shape acute variation transition position；In addition, between punching-swollen work step uninterrupted, it can be achieved that complex component
Single pass molding, shortens the benefit temperature process between the punching press passage and passage of conventional ones technique, greatly improves product
Production efficiency, reduce the energy consumption and mold tooling cost in forming process；Meanwhile the present invention uses the bulging of high temperature oil pressure
Mode solves traditional liquid and is expanded into during type, and heat exchange is frequent between fluid and magnesium alloy plate, the magnesium alloy plate temperature of initiation
The problems such as drop is serious, and material plasticity reduces, and plate spalling phenomenon is serious, and ratio of briquetting is lower.
Detailed description of the invention
Fig. 1 cast outer mold structure schematic illustration；
Fig. 2 internal model structure schematic illustration；
Fig. 3 is process flow chart of the invention.
Specific embodiment
Below in conjunction with specific embodiments of the present invention, the technical solution in the present invention is clearly and completely described,
Based on the scheme in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its scheme, shall fall within the protection scope of the present invention.
The magnesium alloy materials that the present embodiment uses for casting state AZ31, magnesium alloy plate initial blank with a thickness of 32mm.
As shown in Figure 1, 2, technical solution provided herein, inside and outside mould lower edges are the same as material in related punching-swollen equipment
Contact surface is embedded with carbon seal ring；Outer membrane is provided with the oil circuit that can be recycled, and can preheat external mold by high temperature fluid before punching press；
It is provided with oil inlet oil circuit in internal model, after the completion of stamping procedure, the swollen molding procedure of liquid is done directly by oil circuit in internal model；It can be according to tool
External mold is divided into multistage oil circuit by the punching press demand of body, carries out subregion heating to external mold.
Firstly, selecting AZ31 base as-cast magnesium alloy slab, it is heated to 350 DEG C and keeps the temperature 6 hours.And it is oily by milling train by heating
Roll is preheated to 180 DEG C, sets mill speed as 12 m/min, the total reduction of magnesium plate is 80% after three passes, often
The rolling reduction ratio of passage is respectively 30%, 30%, 20%；Between passage, magnesium plate being carried out to melt down heating, heating temperature is 350 DEG C,
Soaking time 15min；Magnesium plate thickness is thinned to 6.4mm after the completion of rolling process, and the rear magnesium plate after rolling is placed on air
Middle natural cooling.Magnesium alloy plate after rolling, smooth to surface through belt sanding, the plate surface roughness after polishing is not high
In 6.3, to avoid the remaining magnesium powder of plate surface from influencing subsequent punching-swollen effect, and to draw in subsequent plate heating process
Enter security risk, residual magnesium powder need to be cleaned up.After magnesium plate magnesium powder remained on surface is cleaned up by giant, by
Plate is placed in bellows and is air-dried through row；Air-dry polishing after magnesium plate, through 280 DEG C anneal 1.5 hours after, continue it is subsequent rush it is swollen
Molding procedure.
As shown in figure 3, external mold is preheated to 180 DEG C, while passing through to internal model firstly, be passed through high temperature hydraulic oil into external mold
The heating of row flame.And the magnesium alloy plate after annealing is heated to 200 DEG C, keep the temperature 45min；Then the magnesium plate after heating is placed
In outer membrane upper end, and after applying certain pressing force by clamping platen, the internal model after preheating starts in the promotion of oil cylinder to plate
Progress punching press, drawing velocity 20mm/s, until after inner mold edge lower surface is with magnesium alloy plate clout upper surface contact in one's ear, it is interior
Mould continues after moving downward 0.8~1.3mm, the promotion oil cylinder locking of internal model, to guarantee that inner membrance ear is close with sealing between magnesium plate.
Hereafter, auxiliary oil circuit sealing valve is opened in internal model cylinder, and high temperature hydraulic oil (180 ~ 190 DEG C of oil temperature) flows into internal model and magnesium plate
Between gap in, subsequent liquid is carried out to preliminary slab after molding and is expanded into type, until magnesium alloy slab pastes completely with outer membrane inner cavity
It is combined into only.
The above, only an example specific embodiment in the present invention, but scope of protection of the present invention is not limited thereto,
Based on the scheme in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its scheme, shall fall within the protection scope of the present invention.
Claims (5)
1. a kind of novel magnesium alloy abnormity component rushes-expanding composite forming method, it is characterised in that:
Inside and outside mould lower edges are embedded with carbon seal ring with the contact surface of material in related punching-swollen equipment；Outer membrane is opened
There is the oil circuit that can be recycled, external mold can be preheated by high temperature fluid before punching press；Oil inlet oil circuit is provided in internal model, stamping procedure is completed
Afterwards, the swollen molding procedure of liquid is done directly by oil circuit in internal model；
Specific steps include following below scheme:
S1, the polishing of magnesium alloy plate surface polishing: reconditioning magnesium alloy plate is smooth to surface, and surface roughness is not less than 6.3, reconditioning
Magnesium plate afterwards is rinsed well with hydraulic giant or air gun, to guarantee that blank enters the drying property of heating furnace, according to the plate of hydraulic giant cleaning
Base need to be air-dried or be dried, and the plate thickness after drying is 5~8mm；
S2, heating magnesium alloy plate to 350 DEG C~420 DEG C keep the temperature 10min and by punching-swollen equipment internal model and external mold heat
To 175 DEG C~230 DEG C heat preservation 30min, plate is placed on above external mold after the completion of heating, while internal model starts to fall, to material
Preliminary punch forming is carried out, the drawing velocity of internal model is 12~25mm/s；
S3, after preliminary punch forming, the master cylinder in internal model is in pressure maintaining locking state, to guarantee internal model top edge and slab ear
Sealing between the clout of side is close；Furthermore auxiliary oil circuit sealing valve is opened in internal model cylinder, and high-temperature, high pressure fluid passes through the hole system in internal model
It flows into the gap between internal model and plate, realizes that the subsequent liquid of plate is expanded into type, until plate surface and external mold inner wall paste completely
It closes.
2. a kind of novel magnesium alloy abnormity component according to claim 1 rushes-expanding composite forming method, feature exists
In: surface roughness after grinding is 3.2~6.3 before magnesium alloy plate forms.
3. a kind of novel magnesium alloy abnormity component according to claim 1 rushes-expanding composite forming method, feature exists
In: the laminating degree of the plate and external mold inner surface is acquired in real time by the monitoring of auxiliary oil circuit oil pressure, is become when oil pressure is higher than to stablize
When shape pressure value 55%~80%, the complete fitting of plate and external mold inner surface is determined.
4. a kind of novel magnesium alloy abnormity component according to claim 1 rushes-expanding composite forming method, feature exists
In: the swollen molding fluid of liquid is the warm hydraulic oil of band, and the fluid temperature (F.T.) of bulging work step (S3) is 180 DEG C~220 DEG C.
5. a kind of novel magnesium alloy abnormity component according to claim 1 rushes-expanding composite forming method, feature exists
In magnesium alloy plate rolling mill practice early period for punching press are as follows: mill speed 12m/min, magnesium plate after three passages
Overall reduction is 80%, and drafts per pass is respectively 30%, 30%, 20%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247814A (en) * | 2021-12-23 | 2022-03-29 | 湖南顶立科技有限公司 | Extrusion forming device and die pressing method |
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| CN102806261A (en) * | 2012-08-16 | 2012-12-05 | 哈尔滨工业大学 | Device and method for hydraulic forming of cavity part with complex curved surface |
| US20140196514A1 (en) * | 2013-01-04 | 2014-07-17 | Technology On Prototyping Ultimate (Topu) | Method for Making Metal Body and Metal Box by Using Hydroforming |
| CN203876095U (en) * | 2014-04-08 | 2014-10-15 | 昆山智盛精密铸造有限公司 | Constant-temperature type magnesium alloy mold |
| CN204194526U (en) * | 2014-11-04 | 2015-03-11 | 贵州风雷航空军械有限责任公司 | A kind of bulging device of large thin-wall cup-shaped metal |
| US20170095855A1 (en) * | 2015-12-14 | 2017-04-06 | Rasoul Jelokhani Niaraki | High-speed hydraulic forming of metal and non-metal sheets using electromagnetic fields |
| CN207103535U (en) * | 2017-08-08 | 2018-03-16 | 天津天锻航空科技有限公司 | A kind of customized parameter sheet material bulging assembling die |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101786128A (en) * | 2010-02-25 | 2010-07-28 | 机械科学研究总院先进制造技术研究中心 | Hot stamping and superplastic gas-bulging combined forming process |
| CN102806261A (en) * | 2012-08-16 | 2012-12-05 | 哈尔滨工业大学 | Device and method for hydraulic forming of cavity part with complex curved surface |
| US20140196514A1 (en) * | 2013-01-04 | 2014-07-17 | Technology On Prototyping Ultimate (Topu) | Method for Making Metal Body and Metal Box by Using Hydroforming |
| CN203876095U (en) * | 2014-04-08 | 2014-10-15 | 昆山智盛精密铸造有限公司 | Constant-temperature type magnesium alloy mold |
| CN204194526U (en) * | 2014-11-04 | 2015-03-11 | 贵州风雷航空军械有限责任公司 | A kind of bulging device of large thin-wall cup-shaped metal |
| US20170095855A1 (en) * | 2015-12-14 | 2017-04-06 | Rasoul Jelokhani Niaraki | High-speed hydraulic forming of metal and non-metal sheets using electromagnetic fields |
| CN207103535U (en) * | 2017-08-08 | 2018-03-16 | 天津天锻航空科技有限公司 | A kind of customized parameter sheet material bulging assembling die |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247814A (en) * | 2021-12-23 | 2022-03-29 | 湖南顶立科技有限公司 | Extrusion forming device and die pressing method |
| CN114247814B (en) * | 2021-12-23 | 2023-12-05 | 湖南顶立科技有限公司 | Extrusion molding device and molding method |
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Application publication date: 20190618 |