CN102489582A - Flexible forming method of variable cross-section special-shaped piece with closed cavities - Google Patents
Flexible forming method of variable cross-section special-shaped piece with closed cavities Download PDFInfo
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- CN102489582A CN102489582A CN2011103662683A CN201110366268A CN102489582A CN 102489582 A CN102489582 A CN 102489582A CN 2011103662683 A CN2011103662683 A CN 2011103662683A CN 201110366268 A CN201110366268 A CN 201110366268A CN 102489582 A CN102489582 A CN 102489582A
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Abstract
The invention relates to a flexible forming method of a variable cross-section special-shaped piece with closed cavities, belonging to the field of machinery manufacturing. The method is characterized by comprising the following steps: prefabricating upper and lower dies with cavities with final shapes, putting a prefabricated workpiece with allowance after computation into the cavities and assembling and fixing the dies; and filling a mixture into the workpiece with closed cavities or with the function of closing the cavities, igniting the mixture and swelling local workpiece through thermal shock waves, thus realizing forming of the workpiece. The method has the following characteristics: the forming force is big; different mixture proportions can be selected aiming at different preformed piece materials; and the way of first preheating and then forming, forming once or forming multiple times can be selected, thus the method is beneficial to accurate forming of the formed piece.
Description
Technical field
A kind of flexible forming method with enclosed cavity variable cross-section shaped piece belongs to mechanical engineering field
Background technology
Having enclosed cavity variable cross-section shaped piece is widely used in manufacturing fields such as automobile, Aero-Space, boats and ships; General manufacturing process is to remove technologies such as processing, hydraulic expanding-forming or spinning and realize through welding, machinery; These several kinds of technologies have the process complicacy, cost is higher, forming efficiency is low, are unfavorable for the defective of workpiece Accurate Shaping.This manufacturing process, just can be realized through pressurization at first for the workpiece of wall thickness between 0.1～0.4mm through flammable mixture is fed enclosed cavity; The better workpiece of plasticity that exceeds 0.4mm for wall thickness; At first need install mould additional in its appearance; Put burning mixt then, the super-pressure that utilizes the gas combustion blast to form is realized the shaping of workpiece, owing to discharge the shaping that great amount of heat helps workpiece in the gas combustion process; Feed gas simultaneously for a long time, help the subsides mould and the forming accuracy of workpiece.
Summary of the invention
The objective of the invention is to improve common manufacturing process and remove the forming processes that technology had complicacies such as processing, hydraulic expanding-forming or spinning through welding, machinery, cost is higher, and forming efficiency is low, is unfavorable for the deficiency of the Accurate Shaping of workpiece.Satisfy the demand of industries such as automobile, Aero-Space, boats and ships, building to variable-cross-section special shaped of cavity.Flexible forming method with variable-cross-section special shaped of enclosed cavity proposed by the invention; For cold plasticity material preform workpiece preferably; Directly detonation is shaped; And, can reach burning through the mixed proportion of control admixture of gas for the hot formed workpiece of needs, realization heat expansion shape is lighted at the mist that feeding reaches the detonation critical point in the back.And, can also realize repeatedly detonation bulging, thereby realize gradual shaping for the bigger workpiece of deflection.
The present invention can realize above-described purpose through following technical scheme, and accompanying drawings is following:
Have the flexible forming method of enclosed cavity variable cross-section shaped piece, may further comprise the steps:
Step 1, a prefabricated upper and lower mould (5,8) that has the cavity of net shape is put into cavity with the prefabricated workpiece (4) that leaves surplus after calculating, and matched moulds is also fixing.
Step 2 has enclosed cavity or has in the prefabricated workpiece (4) of enclosed cavity function but mixture is passed into, and the some burning mixt makes prefabricated workpiece (4) differential expansion through thermal shock wave, thereby realizes component shaping.
Mixture in the described prefabricated workpiece (4) is to be made up of the mixture of fuel gas and combustion-supporting gas mixture or flammable liquid and combustion-supporting gas or the mixture of dust and combustion-supporting gas.
Flow valve (1), the Pressure gauge (2) of control mixture flow rate is housed on the described upper and lower mould (5,8) and in mould cavity, is furnished with position sensor.Its effect is that the signal that discharges through sensor judges whether workpiece has reached the shape of desire system.
Be furnished with igniter (3) in the chamber of described prefabricated workpiece (4); On it one or more ignition points can be arranged; The quantity of ignition point depends primarily on the workpiece shape, and the cable of igniter is cemented in the workpiece chamber through pipe, when needing ignition point; On pipe, open circular hole, and the installation igniter gets final product.
Described prefabricated workpiece (4) is handled in advance line bend, axial compression preform of shaping.
Described mixture is different according to the wall thickness of prefabricated workpiece (4), and its mixed proportion is different, lights the order difference, for the prefabricated preferably workpiece of cold plasticity (4), directly mixes the mixture that reaches the detonation critical point and lights the detonation bulging; And for the hot formed prefabricated workpiece of needs (4), at first feed mixture to realize by the completing combustion release heat, the preheating workpiece, and then feed the mixture that reaches the detonation critical point and carry out the detonation bulging, thereby realize being shaped eventually.
Described step 2 can be carried out one or many and fed mist detonation bulging.
In order to realize that having enclosed cavity variable cross-section shaped piece is shaped, reduce production costs, satisfy the needs of industries such as automobile, Aero-Space, boats and ships, building, the present invention provides the flexible forming method of the higher hollow variable cross-section spare of a kind of efficient.Provided by the invention have an enclosed cavity variable cross-section shaped piece flexible forming method; Performing member is put into the upper and lower mould of completion of processing, and the two ends of sealing performing member, leave igniter and the pipeline that passes in and out mixture simultaneously; Mixture is fed in the enclosed cavity of performing member; Can realize the shaping of workpiece through two kinds of approach, when at first having plasticity for the material of performing member, the ratio of adjustment mixture realizes that detonation just can reach bulging; For the hot formed material of needs, need at first adjust the mixed proportion of mixture, make its burning earlier, make the preheating of preformation spare through release heat, and then feed the mixture realization detonation bulging that reaches the detonation critical point.Generally realize bulging in the method for the present invention, still require big or the relatively poor workpiece of plasticity, need repeatedly feed mixture and realize repeatedly lighting the detonation shaping for deflection once to feed mixture.
Description of drawings
Fig. 1 a is for to be placed on the sketch map in the die cavity with performing member.
Fig. 1 b is the sketch map that performing member detonation shaping postforming part is full of die cavity.
Fig. 2 makes its local fold that produces with the performing member axial compression, thereby reserves the sketch map of bigger shaping surplus for drip molding.
Adopt gradual repeatedly detonation forming process sketch map when Fig. 3 is shaping moderate finite deformation workpiece, wherein double dot dash line is the residing position of workpiece outer surface after each detonation.
Among the figure, 1. flow valve, 2. Pressure gauge, 3. igniter, 4. prefabricated workpiece, 5. patrix, 6. plugging device, 7. Pressure gauge, 8. counterdie
The specific embodiment
Further specify particular content of the present invention and forming process below in conjunction with embodiment shown in the drawings.
A kind of flexible forming method of the present invention with enclosed cavity variable cross-section shaped piece; Adopt following step: at first; Prefabricated one have net shape patrix 5 and counterdie 8, the prefabricated workpiece 4 that leaves surplus after calculating is put into cavity, matched moulds is also fixing.
Secondly, have enclosed cavity or have in the prefabricated workpiece 4 of enclosed cavity function, through 3 burning mixts of igniter, make the local bulging of prefabricated workpiece, thereby realize the shaping of prefabricated workpiece through detonation but mixture is passed into.The pressure of its mixture is measured through Pressure gauge 2, and the feeding of mixture and outflow are controlled through valve 1, and in mould cavity, are furnished with position sensor.Its effect is that the signal that discharges through sensor judges whether workpiece has reached the shape of desire system.
The described preform workpiece preforms such as line bend, axial compression that can advance in shaping are handled.
The mixture of described preform workpiece can be that the mixture of fuel gas and combustion-supporting gas mixture or flammable liquid and combustion-supporting gas or the mixture of dust and combustion-supporting gas constitute.
Described mixture is different according to the wall thickness of prefabricated workpiece 4, and its mixed proportion is different, and it is different to light order, for the prefabricated preferably workpiece 4 of cold plasticity, can directly mix the mixture that reaches the detonation critical point and light explosive forming and all can; And for the hot formed prefabricated workpiece 4 of needs, can at first feed mixture to realize by the completing combustion release heat, the prefabricated workpiece of preheating, and then feed the mixture that reaches the detonation critical point and carry out the detonation bulging, thereby realize being shaped eventually.
The mixture of said step 2 can repeatedly feed in the enclosed cavity of prefabricated workpiece 4 and realize that repeatedly detonation realizes gradual detonation bulging.
Fig. 1 is the prefabricated workpiece 4 process sketch map that detonation is shaped in die cavity, shown in Fig. 1 a, earlier prefabricated workpiece 4 is placed in the die cavity; Matched moulds is also fixing; Mixture is fed in the cavity of prefabricated workpiece 4 through pipeline, utilize 3 burning mixts of igniter, make prefabricated workpiece 4 bulgings be full of die cavity (consulting shown in Fig. 1 b); The distortion situation of prefabricated workpiece 4 observed and judged to signal through sensor can in the mould outside, and then judge whether be shaped next time.
Fig. 2 is that prefabricated workpiece 4 axial compression make its local generation fold, thereby is the sketch map that prefabricated workpiece 4 is reserved bigger shaping surplus.At first for requiring the bigger prefabricated workpiece of deflection; It is required that the ductility of the wall thickness of prefabricated workpiece can not reach, so must carry out preform to prefabricated workpiece 4, the two ends of performing member compressed; Make it produce certain allowance, lay the foundation for being shaped eventually.
Fig. 3 adopts gradual repeatedly detonation forming process sketch map during for the prefabricated workpiece 4 of shaping moderate finite deformation.For bigger prefabricated workpiece of deflection or the relatively poor material of plasticity; Forming process is divided into repeatedly carries out, realize gradual shaping, feed a little mixture at first for the first time; Carry out detonation; Not only can make prefabricated workpiece produce a little distortion, also can carry out The pre-heat treatment simultaneously, help next step shaping prefabricated workpiece.
Clearly, more than the content shown in description and the accompanying drawing all should be understood that it is exemplary, but not means the restriction to the method for the invention.To those skilled in the art, obviously can on basis of the present invention, make amendment to it.But as previously mentioned, those skilled in the art can freely select the proportioning mixture according to actual needs, the increase and decrease ignition point, and the quantity and the arrangement form of increase and decrease flow spoiler etc., or the like.Obviously, these modifications all should be within the scope of the present invention.
Claims (7)
1. have the flexible forming method of enclosed cavity variable cross-section shaped piece, it is characterized in that, may further comprise the steps:
Step 1, a prefabricated upper and lower mould (5,8) that has the cavity of net shape is put into cavity with the prefabricated workpiece (4) that leaves surplus after calculating, and matched moulds is also fixing;
Step 2 has enclosed cavity or has in the prefabricated workpiece (4) of enclosed cavity function but mixture is passed into, and the some burning mixt makes prefabricated workpiece (4) differential expansion through thermal shock wave, thereby realizes component shaping.
2. according to the flexible forming method of the said enclosed cavity variable cross-section of claim 1 shaped piece; It is characterized in that the mixture in the described prefabricated workpiece (4) is to be made up of the mixture of fuel gas and combustion-supporting gas mixture or flammable liquid and combustion-supporting gas or the mixture of dust and combustion-supporting gas.
3. according to the flexible forming method of the said enclosed cavity variable cross-section of claim 1 shaped piece, it is characterized in that described upper and lower mould (5,8) is equipped with flow valve (1), the Pressure gauge (2) of control mixture flow rate and in mould cavity, is furnished with position sensor.
4. according to the flexible forming method of the said enclosed cavity variable cross-section of claim 1 shaped piece, it is characterized in that, be furnished with igniter (3) in the chamber of described prefabricated workpiece (4), on it one or more ignition points can be arranged.
5. according to the flexible forming method of the said enclosed cavity variable cross-section of claim 1 shaped piece, it is characterized in that described prefabricated workpiece (4) is handled in advance line bend, axial compression preform of shaping.
6. according to the flexible forming method of the said enclosed cavity variable cross-section of claim 1 shaped piece; It is characterized in that; Described mixture is different according to the wall thickness of prefabricated workpiece (4), and its mixed proportion is different, lights the order difference; For the prefabricated preferably workpiece of cold plasticity (4), directly mix the mixture that reaches the detonation critical point and light explosive forming; And for the hot formed prefabricated workpiece of needs (4), at first feed mixture to realize by the completing combustion release heat, the preheating workpiece, and then feed the mixture that reaches the detonation critical point and carry out thermal shock wave and be shaped, thereby realize being shaped eventually.
7. according to the flexible forming method of the said enclosed cavity variable cross-section of claim 1 shaped piece, it is characterized in that described step 2 is carried out one or many and fed mixture detonation bulging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103662683A CN102489582A (en) | 2011-11-18 | 2011-11-18 | Flexible forming method of variable cross-section special-shaped piece with closed cavities |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103662683A CN102489582A (en) | 2011-11-18 | 2011-11-18 | Flexible forming method of variable cross-section special-shaped piece with closed cavities |
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| CN102489582A true CN102489582A (en) | 2012-06-13 |
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| CN2011103662683A Pending CN102489582A (en) | 2011-11-18 | 2011-11-18 | Flexible forming method of variable cross-section special-shaped piece with closed cavities |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115740167A (en) * | 2022-12-26 | 2023-03-07 | 河北亚都管道装备集团有限公司 | Equal-diameter hot extrusion forming process for steel seamless thick-wall tee joint |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB878178A (en) * | 1959-12-01 | 1961-09-27 | Olin Mathieson | Metal forming |
| US3958437A (en) * | 1975-01-24 | 1976-05-25 | Seew Barorian | Process for manufacturing metal poles |
| CN2206165Y (en) * | 1994-04-18 | 1995-08-30 | 熊世纬 | Double directional explosive forming container closing device |
| CN1792493A (en) * | 2005-12-19 | 2006-06-28 | 河南科技大学 | Method for forming magnesium alloy pipe fitting |
| CN1827253A (en) * | 2001-05-22 | 2006-09-06 | 三菱自动车工业株式会社 | Hydroform process and hydroform product |
-
2011
- 2011-11-18 CN CN2011103662683A patent/CN102489582A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB878178A (en) * | 1959-12-01 | 1961-09-27 | Olin Mathieson | Metal forming |
| US3958437A (en) * | 1975-01-24 | 1976-05-25 | Seew Barorian | Process for manufacturing metal poles |
| CN2206165Y (en) * | 1994-04-18 | 1995-08-30 | 熊世纬 | Double directional explosive forming container closing device |
| CN1827253A (en) * | 2001-05-22 | 2006-09-06 | 三菱自动车工业株式会社 | Hydroform process and hydroform product |
| CN1792493A (en) * | 2005-12-19 | 2006-06-28 | 河南科技大学 | Method for forming magnesium alloy pipe fitting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115740167A (en) * | 2022-12-26 | 2023-03-07 | 河北亚都管道装备集团有限公司 | Equal-diameter hot extrusion forming process for steel seamless thick-wall tee joint |
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Application publication date: 20120613 |