CN101234405B - Forward and reverse superplastic bulging method capable of changing friction condition - Google Patents
Forward and reverse superplastic bulging method capable of changing friction condition Download PDFInfo
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- CN101234405B CN101234405B CN2008100638619A CN200810063861A CN101234405B CN 101234405 B CN101234405 B CN 101234405B CN 2008100638619 A CN2008100638619 A CN 2008100638619A CN 200810063861 A CN200810063861 A CN 200810063861A CN 101234405 B CN101234405 B CN 101234405B
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Abstract
The invention provides a forward and reverse superplastic bulging method for altering friction condition, relating to a forward and reverse superplastic bulging method. The method of the invention solves the problem of the existing superplastic bulging method that the thickness distribution of the formed workpiece is uneven, which is completed as follows: a. die processing: a series of grooves areprocessed on moulding surface of a reverse bulging die, and surface spray coating method is adopted on moulding surface of a forward bulging die; a lower die is heated, a high pressure spray gun is used for spraying and coating BN ceramic powder solution on the surface of a lower die cavity; b. die charging; c. die entering of plate blank; d. die assembly; e. heating up and heat preservation; f.reverse bulging; g. pressure maintaining after die pressing; h. reverse pressure unloading; j. forward bulging; k. pressure maintaining after die pressing; L. furnace cooling; m. workpiece withdrawing. The forward and reverse superplastic bulging method for altering friction condition provides an economic, efficient and practical manufacturing technique for solving the problem of controlling the uniform thickness of the workpiece in forward and reverse superplastic bulging.
Description
Technical field
The present invention relates to a kind of forward and reverse expansive forming method, belong to expansive forming processing technology field.
Background technology
The structure superplastic alloy is under the condition of superplastic deformation, and its distortional stress is very low, and percentage elongation is very high, and does not almost have spring-go and close strain hardening effect, can hang down the very complicated workpiece of once drawing shape on the tonnage equipment, and need not finished machined.Therefore, the superplasticforming technology is quite paid attention in modern industry.But the method for existing expansive forming is in the bulging process, because the slab periphery material is compressed by mould and is not participated in distortion, the increase of part area is realized by the slab attenuation fully, the inhomogeneities of stress and strain field distribution causes the notable difference of final workpiece, even strain hardening and strain-rate sensitivity Coefficient m value approaches 1.0, also be difficult to the problem of avoiding thickness distribution obviously uneven.Slab free bulge before this under the gas pressure effect in addition, when a certain part of slab contacts with mold cavity, this local deformation will become difficult under the frictional resistance effect, thereby it is late more to paste mould, attenuate is many more, and along with slab pad pasting progressively, deformable zone is more and more little on the slab, the slab thickness that does not paste the mould part will continue attenuation, so just cause the serious uneven and even generation fracture phenomena of Forming Workpiece thickness.Therefore, how making Forming Workpiece thickness homogenising is urgent problem in the prior art.
Summary of the invention
The objective of the invention is for there is the uneven problem of Forming Workpiece thickness distribution in the method that solves existing expansive forming, and then a kind of forward and reverse expansive forming method that becomes friction condition is provided.
A kind of forward and reverse expansive forming method that becomes friction condition of the present invention is finished like this: a, Mould Machining: at first carry out the processing of reverse expanding die, processing groove a series of and that the reverse bulging direction of slab is perpendicular increases the frictional force of slab and patrix on the profile of the completed reverse expanding die of shape, carry out the processing of forward expanding die then, the method that adopts the surface to spray on the profile of the completed forward expanding die of shape reduces the frictional force of slab and counterdie, at first dispose BN ceramic powders solution, counterdie is heated, then with high-pressure spray gun with BN ceramic powders solution spraying to the surface of counterdie die cavity, form the very thin lubricating layer of one deck, described reverse expanding die and forward expanding die constitute upper die and lower die respectively; B, mould shove charge; C, slab enter mould; D, matched moulds; E, intensification, insulation; F, reverse bulging; Pressurize behind g, the subsides mould; H, lay down buffer brake; J, forward bulging; Pressurize behind k, the subsides mould; L, cool off with stove; M, taking-up workpiece.
The present invention has following beneficial effect: the present invention adopts machining process and the profile of surperficial spraying method control mould and the frictional force between the slab, utilize reverse mould different with the friction condition on direct die die cavity surface, make that reverse bulging frictional force is big, local pre-attenuate effect is obvious; Frictional force is little during the forward bulging, and bulk deformation is even.Thereby for the problem that solves control thickness of workpiece homogenising in the positive and negative bloated expansive forming provides a kind of economy, effectively, practical production technology.
Description of drawings
Fig. 1 is the overall structure master's pseudosection with the forward and reverse expansive forming of method of the present invention.
The specific embodiment
The specific embodiment one: a kind of forward and reverse expansive forming method that becomes friction condition of present embodiment is finished like this: a, Mould Machining: at first carry out the processing of reverse expanding die, processing groove a series of and that the reverse bulging direction of slab is perpendicular increases the frictional force of slab and patrix on the profile of the completed reverse expanding die of shape; Carry out the processing of forward expanding die then, the method that adopts the surface to spray on the profile of the completed forward expanding die of shape reduces the frictional force of slab and counterdie, at first dispose BN ceramic powders solution, counterdie is heated, then with high-pressure spray gun with BN ceramic powders solution spraying to the surface of counterdie die cavity, form the very thin lubricating layer of one deck; B, mould shove charge; C, slab enter mould; D, matched moulds; E, intensification, insulation; F, reverse bulging; Pressurize behind g, the subsides mould; H, lay down buffer brake; J, forward bulging; Pressurize behind k, the subsides mould; L, cool off with stove; M, taking-up workpiece.
The specific embodiment two: the difference of the present embodiment and the specific embodiment one is: present embodiment is in a Mould Machining step, and described the section a series of and groove that the reverse bulging direction of slab is perpendicular is U font structure.Can produce big frictional force, be difficult to continue to take place to flow after making slab paste mould, pre-attenuate effect obviously increases.
The specific embodiment three: the difference of the present embodiment and the specific embodiment one is: present embodiment is in a Mould Machining step, described groove a series of and that the reverse bulging direction of slab is perpendicular determines that according to the thickness of slab the degree of depth of groove and width are no more than 500 μ m in position, the density degree of the profile of reverse expanding die.Process reasonable organization, groove that the depth is different at reverse model face, make different zones have different frictional force, thereby can control the attenuate degree difference of the reverse bulging zones of different of slab, reach effectively pre-attenuate effect.
The specific embodiment four: the difference of the present embodiment and the specific embodiment one is: present embodiment is in a Mould Machining step, and described BN ceramic powders solution is the aqueous solution.Plate continued to flow the bigger mobile height homogenising that helps sheet thickness after the high lubricating effect of the lubricating layer that forms, the skin-friction force of the profile of forward expanding die helped forward bulging subsides mould for a short time.
The specific embodiment five: the difference of the present embodiment and the specific embodiment four is: the concentration of the described BN ceramic powders of the present embodiment aqueous solution is 15%～30%.Plate continued to flow the bigger mobile height homogenising that helps sheet thickness after the high lubricating effect of the lubricating layer that forms, the skin-friction force of the profile of forward expanding die helped forward bulging subsides mould for a short time.
The specific embodiment six: the difference of the present embodiment and the specific embodiment one is: present embodiment in a Mould Machining step, described counterdie is heated to 80 ℃～90 ℃ after spraying again.Can make the adhesion effect of the BN ceramic powders aqueous solution better.
Claims (6)
1. forward and reverse expansive forming method that becomes friction condition, it is characterized in that described expansive forming method finishes like this: a, Mould Machining: at first carry out the processing of reverse expanding die, processing is a series of on the profile of the completed reverse expanding die of shape increases the frictional force of slab and patrix with the perpendicular groove of the reverse bulging direction of slab; Carry out the processing of forward expanding die then, the method that adopts the surface to spray on the profile of the completed forward expanding die of shape reduces the frictional force of slab and counterdie, at first dispose BN ceramic powders solution, counterdie is heated, then with high-pressure spray gun with BN ceramic powders solution spraying to the surface of counterdie die cavity, form the very thin lubricating layer of one deck, described reverse expanding die and forward expanding die constitute upper die and lower die respectively; B, mould shove charge; C, slab enter mould; D, matched moulds; E, intensification, insulation; F, reverse bulging; Pressurize behind g, the subsides mould; H, lay down buffer brake; J, forward bulging; Pressurize behind k, the subsides mould; L, cool off with stove; M, taking-up workpiece.
2. according to the described a kind of forward and reverse expansive forming method that becomes friction condition of claim 1, it is characterized in that in a Mould Machining step that described the section a series of and groove that the reverse bulging direction of slab is perpendicular is U font structure.
3. according to the described a kind of forward and reverse expansive forming method that becomes friction condition of claim 1, it is characterized in that in a Mould Machining step, described groove a series of and that the reverse bulging direction of slab is perpendicular determines that according to the thickness of slab the degree of depth of groove and width are no more than 500 μ m in position, the density degree of the profile of reverse expanding die.
4. according to the described a kind of forward and reverse expansive forming method that becomes friction condition of claim 1, it is characterized in that in a Mould Machining step described BN ceramic powders solution is the aqueous solution.
5. according to the described a kind of forward and reverse expansive forming method that becomes friction condition of claim 4, the concentration that it is characterized in that the described BN ceramic powders aqueous solution is 15%～30%.
6. according to the described a kind of forward and reverse expansive forming method that becomes friction condition of claim 1, it is characterized in that in a Mould Machining step, described counterdie is heated to 80 ℃～90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100638619A CN101234405B (en) | 2008-01-16 | 2008-01-16 | Forward and reverse superplastic bulging method capable of changing friction condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100638619A CN101234405B (en) | 2008-01-16 | 2008-01-16 | Forward and reverse superplastic bulging method capable of changing friction condition |
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| Publication Number | Publication Date |
|---|---|
| CN101234405A CN101234405A (en) | 2008-08-06 |
| CN101234405B true CN101234405B (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100638619A Expired - Fee Related CN101234405B (en) | 2008-01-16 | 2008-01-16 | Forward and reverse superplastic bulging method capable of changing friction condition |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107866458B (en) * | 2017-11-06 | 2020-04-10 | 北京航星机器制造有限公司 | Forming method for realizing high-temperature bulging self-feeding material by changing friction coefficient |
| CN112756473B (en) * | 2020-12-17 | 2023-02-17 | 重庆虎溪电机工业有限责任公司 | Method for making copper thin-wall skeleton |
| CN114210823A (en) * | 2021-11-24 | 2022-03-22 | 哈尔滨工业大学 | Multi-position loading flexible medium composite superplastic forming device and method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5647239A (en) * | 1994-04-07 | 1997-07-15 | The Boeing Company | Die for superplastic forming |
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2008
- 2008-01-16 CN CN2008100638619A patent/CN101234405B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5647239A (en) * | 1994-04-07 | 1997-07-15 | The Boeing Company | Die for superplastic forming |
Non-Patent Citations (5)
| Title |
|---|
| JP特开2003-33821A 2003.02.04 |
| JP特开2006-205188A 2006.08.10 |
| JP特开2006-334658A 2006.12.14 |
| 王中阳，等.控制厚度分布的正反向超塑胀形的有限元分析.材料科学与工艺12 3.2004,12(3),279-282. |
| 王中阳,等.控制厚度分布的正反向超塑胀形的有限元分析.材料科学与工艺12 3.2004,12(3),279-282. * |
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| CN101234405A (en) | 2008-08-06 |
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Granted publication date: 20100616 Termination date: 20110116 |