CN102357584A - Method for forming double-layer sheet in paired bulging way - Google Patents
Method for forming double-layer sheet in paired bulging way Download PDFInfo
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- CN102357584A CN102357584A CN2011103418203A CN201110341820A CN102357584A CN 102357584 A CN102357584 A CN 102357584A CN 2011103418203 A CN2011103418203 A CN 2011103418203A CN 201110341820 A CN201110341820 A CN 201110341820A CN 102357584 A CN102357584 A CN 102357584A
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Abstract
The invention discloses a method for forming a double-layer sheet in a paired bulging way, relates to a method for forming the sheet, and aims to solve the technical problem that large friction force is applied to materials of flange zones and the materials flow difficultly during paired bulging of the conventional double-layer sheet. The method comprises the following steps of: processing the peripheries of flange zones of moulds and keeping narrower bosses of the inner circles; laminating sheets between the moulds, and setting a medium passage; after the moulds are closed, applying blank holder force to the sheets to seal the sheets; introducing a pressure medium between the sheets to bulge the sheets; and after forming, releasing the pressure medium to obtain parts. During forming, the direct contact areas of the flange zones and the sheets are small, and the resistance of the sheets flowing towards a module cavity is low. The method for forming the double-layer sheet in the paired bulging way can be used for the field of sheet plastic processing.
Description
Technical field
The present invention relates to the sheet material forming method.
Background technology
The paired bulging of double sheets is a kind of advanced person's a plate material parts manufacturing process, and its principle schematic is as shown in Figure 1, and wherein 1 is mold, and 2 is bed die, and 3 is last sheet material, and 4 are following sheet material, and 5 is medium channel.During shaping; Two-layer sheet material 3 and 4 is stacked; Compress in the outer ring of sheet material 3 and 4 and to realize sealing, the applying mold cavity obtained required part after the medium (gas or liquid) that charges into certain pressure through medium channel 5 to the centre of two-layer sheet material 3 and 4 then made sheet material generation bulging.Utilize the paired bulging of double sheets, can two shapes of once-forming, part that size is identical or different, forming efficiency improves.In addition; Compare traditional sheet material bulging or drawing and forming; Have only the upper plate upper surface to contact with mould with the lower plate lower surface during double sheets bulging, the contact-making surface between two plates is fricton-tight each other in forming process, and the surface quality of back this side of sheet material that therefore is shaped is high.
But when the paired bulging of double sheets, flange district sheet material will receive the effect of certain pressure-pad-force (upper and lower mould is to the pressure of sheet material), and flange district sheet material will receive certain frictional resistance when in mold cavity, flowing.The size of frictional resistance is mainly determined coefficient of friction between pressure-pad-force, mould and the sheet material of sheet material and the contact area between mould and sheet material by mould.For guaranteeing the positiver sealing between the doubling plate, need apply enough pressure-pad-forces.When pressure-pad-force is big, flange district material will receive the obstruction of big frictional force and be difficult for flowing to mold cavity, be difficult to shaping form complicacy, part that deflection is big.
Summary of the invention
The present invention is that flange district material receives big frictional force in the time of will solving the paired bulging of existing double sheets, the technical problem of material flow difficulties, and the method for the paired expansion forming of a kind of double sheets is provided.
The method of the paired expansion forming of a kind of double sheets of the present invention is carried out according to the following steps:
One, with the convex platform and the lower convex platform that only keep inner ring after the peripheral processing in the flange district of the mold of the paired expansion forming of double sheets and bed die, the width of convex platform and lower convex platform is 10mm～50mm;
Two, will go up sheet material and following sheet material stacks, and be placed between mold and the bed die, and medium channel is placed between sheet material and the following sheet material;
Three, with behind mold and the bed die matched moulds, the pressure-pad-force that last sheet material and following sheet material are applied 10kN～2000kN makes sheet material and following sheet material sealing;
Four, the pressure medium of 5Mpa～200MPa is fed to go up through medium channel sheet material and following sheet material generation bulging are out of shape, again pressure medium is discharged through medium channel after the end to be formed, obtain the part behind the bulging.
The present invention only keeps narrower convex platform of inner ring and lower convex platform after processing through the periphery, flange district with mold and bed die; So be provided with; The region area that mould and sheet material are directly contacted reduces greatly, thus the resistance that the sheet material that can reduce the flange district flows to mold cavity.Mold of the present invention and bed die have only the boss of the less width of inner ring to cooperatively interact, and other parts need not to cooperate, and have therefore reduced the Mould Machining required precision; Have bigger gap in the outer peripheral areas in mould flange district, this provides enough spaces for the stressed or displacement of control flange district sheet material etc.
The method of the paired expansion forming of double sheets of the present invention can be used for sheet material plastic working field.
Description of drawings
Fig. 1 is the paired bulging principle schematic of existing double sheets; Wherein 1 is mold, and 2 is bed die, and 3 is last sheet material, and 4 are following sheet material, and 5 is medium channel, and P representes pressure medium;
Fig. 2 is the method sketch map of the paired expansion forming of double sheets of the specific embodiment two, and wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die, and 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material, and 10 is medium channel, and P representes pressure medium;
Fig. 3 is the method sketch map of the paired expansion forming of double sheets of the specific embodiment three, and wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die; 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material; 10 is medium channel, and 11 is compact heap, and P representes pressure medium;
Fig. 4 is the method sketch map of the paired expansion forming of double sheets of the specific embodiment four, and wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die; 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material, and 10 is medium channel; 11 is compact heap, and 12 is sealing ring, and P representes pressure medium;
Fig. 5 is the method sketch map of the paired expansion forming of double sheets of the specific embodiment five, and wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die; 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material, and 10 is medium channel; 13 is pressing clip, and F representes horizontal thrust, and P representes pressure medium;
Fig. 6 is the method sketch map of the paired expansion forming of double sheets of the specific embodiment six, and wherein 6 is mold, and 6-1 is a convex platform; 7 is bed die, and 7-1 is a lower convex platform, and 8 is last sheet material; 9 are following sheet material, and 10 is medium channel, and 12 is sealing ring; 13 is pressing clip, and F representes horizontal thrust, and P representes pressure medium;
Fig. 7 is the state diagram in the bulging in the paired expansion forming process of double sheets in the test one, and wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die; 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material; 10 is medium channel, and 11 is compact heap, and P representes pressure medium;
Fig. 8 is the state diagram behind the bulging in the paired expansion forming process of double sheets in the test one, and wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die; 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material; 10 is medium channel, and 11 is compact heap, and P representes pressure medium;
Fig. 9 is the state diagram in the bulging in the paired expansion forming process of double sheets in the test two; Wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die, and 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material, and 10 is medium channel; 13 is pressing clip, and F representes horizontal thrust, and P representes pressure medium;
Figure 10 is the state diagram behind the bulging in the paired expansion forming process of double sheets in the test two; Wherein 6 is mold, and 6-1 is a convex platform, and 7 is bed die, and 7-1 is a lower convex platform, and 8 is last sheet material, and 9 are following sheet material, and 10 is medium channel; 13 is pressing clip, and F representes horizontal thrust, and P representes pressure medium;
The specific embodiment
The specific embodiment one: the method for the paired expansion forming of a kind of double sheets of this embodiment is carried out according to the following steps:
One, with the convex platform 6-1 and the lower convex platform 7-1 that only keep inner ring after the peripheral processing in the flange district of the mold 6 of the paired expansion forming of double sheets and bed die 7, the width of convex platform 6-1 and lower convex platform 7-1 is 10mm～50mm;
Two, will go up sheet material 8 and following sheet material 9 stacks, and be placed between mold 6 and the bed die 7, and medium channel 10 is placed between sheet material 8 and the following sheet material 9;
Three, with behind mold 6 and bed die 7 matched moulds, the pressure-pad-force that last sheet material 8 and following sheet material 9 are applied 10kN～2000kN makes sheet material 8 and following sheet material 9 sealings;
Four, the bulgings distortion takes place through making sheet material 8 and following sheet material 9 between medium channel last sheet material 8 of 10 feedings and the following sheet material 9 in the pressure medium with 5MPa-200MPa; Again pressure medium is discharged through medium channel 10 after the end to be formed, obtain the part behind the bulging.
This embodiment only keeps narrower convex platform 6-1 of inner ring and lower convex platform 7-1 after processing through the periphery, flange district with mold 6 and bed die 7; So be provided with; The region area that mould and sheet material are directly contacted reduces greatly, thus the resistance that the sheet material that can reduce the flange district flows to mold cavity.Mold of this embodiment and bed die have only the boss of the less width of inner ring to cooperatively interact, and other parts need not to cooperate, and have therefore reduced the Mould Machining required precision; Have bigger gap in the outer peripheral areas in mould flange district, this provides enough spaces for the stressed or displacement of control flange district sheet material etc.
The specific embodiment two: what (referring to accompanying drawing 2) this embodiment and the specific embodiment one were different is: will go up sheet material 8 through convex platform 6-1 and lower convex platform 7-1 behind mold 6 and bed die 7 matched moulds in the step 3 and compress with realization with following sheet material 9 and seal.Other is identical with the specific embodiment one.
This embodiment compresses realization with following sheet material 9 and seals through going up sheet material 8 through convex platform 6-1 and lower convex platform 7-1 behind mold 6 and bed die 7 matched moulds; Mold and bed die have only the cooperation boss of the less width of inner ring to cooperatively interact; Mould reduces with the region area that sheet material directly contacts greatly, thereby reduces the flow resistance of the sheet material in flange district to mold cavity.
The specific embodiment three: what (referring to accompanying drawing 3) this embodiment and the specific embodiment one were different is: adopt independently compact heap 11 that sheet material is compressed in the outer ring of last sheet material 8 and following sheet material 9 and realize sealing; The space that has 0.1mm～1.0mm between compact heap 11 and mold 6 and the bed die 7; Level interval between compact heap 11 and convex platform 6-1 and the lower convex platform 7-1 is 10mm～100mm; There are the space of 0.1mm～1.0mm in convex platform 6-1 and last sheet material 8, and there are the space of 0.1mm～1.0mm in lower convex platform 7-1 and following sheet material 9.Other is identical with the specific embodiment one.
Compress sheet material 8 with following sheet material 9 and realize sealing with compact heap 11 in this embodiment, have certain interval between compact heap 11 and mold and the bed die, and convex platform 6-1 and lower convex platform 7-1 do not press sheet material 8 and following sheet material 9 yet when shaping.So be provided with, sealing station is transferred to the position of peripheral compact heap 11, during expansion forming, compact heap 11 will move to the mold cavity direction with following sheet material 9 along with last sheet material 8 together.Adopt the hermetically-sealed construction of this radially servo-actuated, the resistance when making expansion forming reduces greatly, and it is easier to be shaped.
The specific embodiment four: what (referring to accompanying drawing 4) this embodiment and the specific embodiment three were different is: between last sheet material 8 and following sheet material 9, place the cross section in the position at compact heap 11 places and be circular or square sealing ring 12 and seal realizing.Other is identical with the specific embodiment three.
This embodiment adopts sealing ring 12, just can reach the excellent sealing of double sheets, enhancing sealing effectiveness with less thrust.
The specific embodiment five: what (referring to accompanying drawing 5) this embodiment and the specific embodiment one were different is: adopt independently pressing clip 13 that sheet material is compressed in the outer ring of last sheet material 8 and following sheet material 9 and realize sealing; The space that has 0.1mm～1.0mm between pressing clip 13 and mold 6 and the bed die 7; Pressing clip 13 is 10mm～100mm with the level interval of convex platform 6-1 and lower convex platform 7-1; There are the space of 0.1mm～1.0mm in convex platform 6-1 and last sheet material 8, and there are the space of 0.1mm～1.0mm in lower convex platform 7-1 and following sheet material 9.During expansion forming, along continuous straight runs applies the thrust of 10kN～100kN to pressing clip 13.Other is identical with the specific embodiment one.
Compress sheet material 8 with following sheet material 9 and realize sealing with pressing clip 13 in this embodiment, have certain interval between pressing clip 13 and mold and the bed die, and convex platform 6-1 and lower convex platform 7-1 do not press sheet material 8 and following sheet material 9 yet when shaping.So be provided with, sealing station is transferred to the position of peripheral pressing clip 13, in the bulging process, along continuous straight runs applies certain horizontal thrust to pressing clip 13, and is mobile to mold cavity with following sheet material 9 to promote going up sheet material 8.Adopt this radially afterburning hermetically-sealed construction, can further promote sheet material to flow, make shaping easier to mold cavity.
The specific embodiment six: what (referring to accompanying drawing 6) this embodiment and the specific embodiment five were different is: between last sheet material 8 and following sheet material 9, place the cross section in the position at pressing clip 13 places and be circular or square sealing ring 12 and seal realizing.Other is identical with the specific embodiment five.
This embodiment adopts sealing ring 12, just can reach the excellent sealing of double sheets, enhancing sealing effectiveness with less thrust.
The present invention is with following verification experimental verification beneficial effect of the present invention:
Test one: the method for the paired expansion forming of a kind of double sheets of (referring to accompanying drawing 3, Fig. 7, Fig. 8) this test is carried out according to the following steps:
One, with the convex platform 6-1 and the lower convex platform 7-1 that only keep inner ring after the peripheral processing in the flange district of the mold 6 of the paired expansion forming of double sheets and bed die 7, the width of convex platform 6-1 and lower convex platform 7-1 is 50mm;
Two, will go up sheet material 8 and following sheet material 9 stacks, and be placed between mold 6 and the bed die 7, and medium channel 10 is placed between sheet material 8 and the following sheet material 9;
Three, with behind mold 6 and bed die 7 matched moulds; Go up sheet material 8 through 11 pairs of compact heaps and make sheet material 8 and following sheet material 9 sealings with the pressure-pad-force that following sheet material 9 applies 1000kN; Leave the gap of 0.5mm between compact heap 11 and mold 6 and the bed die 7; Level interval between compact heap 11 and convex platform 6-1 and the lower convex platform 7-1 is 50mm, and there are the space of 0.5mm in convex platform 6-1 and last sheet material 8, and there are the space of 0.5mm in lower convex platform 7-1 and following sheet material 9;
Four, the pressure medium of 100MPa is fed to go up through medium channel 10 sheet material 8 and following sheet material 9 generation bulgings are out of shape, and then pressure medium is discharged through medium channel 10, obtain the part behind the bulging.
Represent the paired expansion forming process of double sheets in this test one with Fig. 3, Fig. 7 and Fig. 8; Wherein the state before the bulging of step 3 is as shown in Figure 3; Leave the space between compact heap 11 and mold 6 and the bed die 7, the level interval between compact heap 11 and convex platform 6-1 and the lower convex platform 7-1 is 50mm; State in the bulging process is as shown in Figure 7, and the sheet material that is arranged in die cavity expands to die cavity wall, and compact heap 11 is along with sheet material moves to the die cavity direction together; State when obtaining part after bulging is accomplished is as shown in Figure 8, and sheet material is fitted on the die cavity wall fully, obtains the shape of die cavity.
The inner ring of mold 6 and bed die 7 cooperates boss when being shaped, not compress double sheets, adopts the method for this radially Follow-up seal structure, and the resistance when making expansion forming is very little, and it is easier to be shaped.
Test two: the method for the paired expansion forming of a kind of double sheets of (referring to accompanying drawing 5, Fig. 9 and Figure 10) this test is carried out according to the following steps:
One, with the convex platform 6-1 and the lower convex platform 7-1 that only keep inner ring after the peripheral processing in the flange district of the mold 6 of the paired expansion forming of double sheets and bed die 7, the width of convex platform 6-1 and lower convex platform 7-1 is 30mm;
Two, will go up sheet material 8 and following sheet material 9 stacks, be placed between mold 6 and the bed die 7, then medium channel 10 placed between sheet material 8 and the following sheet material 9;
Three, with behind mold 6 and bed die 7 matched moulds; Go up sheet material 8 through 13 pairs of pressing clips and make sheet material 8 and following sheet material 9 sealings with the pressure-pad-force that following sheet material 9 applies 1000kN; Leave the gap of 0.5mm between pressing clip 13 and mold 6 and the bed die 7; Pressing clip 13 is 80mm with the level interval of convex platform 6-1 and lower convex platform 7-1, and there are the space of 0.5mm in convex platform 6-1 and last sheet material 8, and there are the space of 0.5mm in lower convex platform 7-1 and following sheet material 9;
Four, the pressure medium of 100MPa is gone up between sheet material 8 and the following sheet material 9 through medium channel 10 feedings; While makes sheet material 8 and following sheet material 9 that the bulgings distortion take place at the thrust F that along continuous straight runs on the pressing clip 13 applies 50kN; And then pressure medium discharged through medium channel 10, obtain the part behind the bulging.
The paired expansion forming process of double sheets such as Fig. 5, Fig. 9 and shown in Figure 10 in this test, wherein Fig. 5 is the state diagram before the bulging; Fig. 9 is the state diagram in the bulging; Figure 10 is the state diagram behind the bulging.The inner ring of mold 6 and bed die 7 cooperates boss when being shaped, will not compress double sheets.Realize the sealing of sheet material up and down with pressing clip 13, apply a horizontal thrust F radially simultaneously, expansion forming is accomplished fast, make expansion forming easier.
Claims (6)
1. the method for the paired expansion forming of double sheets; The method that it is characterized in that the paired expansion forming of double sheets is carried out according to the following steps: one, with the convex platform (6-1) and the lower convex platform (7-1) that only keep inner ring after the peripheral processing in the flange district of the mold (6) of the paired expansion forming of double sheets and bed die (7), the width of convex platform (6-1) and lower convex platform (7-1) is 10mm～50mm; Two, will go up sheet material (8) and following sheet material (9) stacks, and be placed between mold (6) and the bed die (7), and medium channel (10) is placed between sheet material (8) and the following sheet material (9); Three, with behind mold (6) and bed die (7) matched moulds, the pressure-pad-force that last sheet material (8) and following sheet material (9) is applied 10kN～2000kN makes sheet material (8) and following sheet material (9) sealing; Four, the bulging distortion takes place through making sheet material (8) and following sheet material (9) in medium channel (10) feeding between sheet material (8) and the following sheet material (9) in the pressure medium with 5MPa～200MPa; Again pressure medium is discharged through medium channel (10) after the end to be formed, obtain the part behind the bulging.
2. the method for the paired expansion forming of a kind of double sheets according to claim 1 is characterized in that will going up sheet material (8) through convex platform (6-1) and lower convex platform (7-1) behind mold in the step 3 (6) and bed die (7) matched moulds and following sheet material (9) compresses to realize sealing.
3. the method for the paired expansion forming of a kind of double sheets according to claim 1; Compact heap (11) compresses the realization sealing with sheet material to it is characterized in that adopting independently in the outer ring of last sheet material (8) and following sheet material (9) in the step 3; The space that has 0.1mm～1.0mm between compact heap (11) and mold (6) and the bed die (7); Level interval between compact heap (11) and convex platform (6-1) and the lower convex platform (7-1) is 10mm～100mm; There are the space of 0.1mm～1.0mm in convex platform (6-1) and last sheet material (8), and there are the space of 0.1mm～1.0mm in lower convex platform (7-1) and following sheet material (9).
4. the method for the paired expansion forming of a kind of double sheets according to claim 3 is characterized in that between last sheet material (8) and following sheet material (9), and placing the cross section in the position at compact heap (11) place is that circular or square sealing ring (12) seals with realization.
5. the method for the paired expansion forming of a kind of double sheets according to claim 1; Pressing clip (13) compresses the realization sealing with sheet material to it is characterized in that adopting independently in the outer ring of last sheet material (8) and following sheet material (9) in the step 3; The space that has 0.1mm～1.0mm between pressing clip (13) and mold (6) and the bed die (7); Pressing clip (13) is 10mm～100mm with the level interval of convex platform (6-1) and lower convex platform (7-1); There are the space of 0.1mm～1.0mm in convex platform (6-1) and last sheet material (8); There are the space of 0.1mm～1.0mm in lower convex platform (7-1) and following sheet material (9), and during expansion forming, along continuous straight runs applies the thrust of 10kN～100kN to pressing clip (13).
6. the method for the paired expansion forming of a kind of double sheets according to claim 5 is characterized in that between last sheet material (8) and following sheet material (9), and placing the cross section in the position at pressing clip (13) place is that circular or square sealing ring (12) seals with realization.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103418203A CN102357584A (en) | 2011-11-02 | 2011-11-02 | Method for forming double-layer sheet in paired bulging way |
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| CN2011103418203A CN102357584A (en) | 2011-11-02 | 2011-11-02 | Method for forming double-layer sheet in paired bulging way |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103042093A (en) * | 2013-01-04 | 2013-04-17 | 太原科技大学 | Thick-wall shell metal piece forming method |
| CN108160796A (en) * | 2017-12-01 | 2018-06-15 | 宁波金凤焊割机械制造有限公司 | A kind of metal cavity volume forming method |
| CN111408660A (en) * | 2020-04-01 | 2020-07-14 | 大连理工大学 | Flange-free edge forming method of thin-wall metal sheet metal component |
| CN111941093A (en) * | 2020-08-04 | 2020-11-17 | 韦民华 | Production process of blow-molded stainless steel chair |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042093A (en) * | 2013-01-04 | 2013-04-17 | 太原科技大学 | Thick-wall shell metal piece forming method |
| CN108160796A (en) * | 2017-12-01 | 2018-06-15 | 宁波金凤焊割机械制造有限公司 | A kind of metal cavity volume forming method |
| CN111408660A (en) * | 2020-04-01 | 2020-07-14 | 大连理工大学 | Flange-free edge forming method of thin-wall metal sheet metal component |
| CN111941093A (en) * | 2020-08-04 | 2020-11-17 | 韦民华 | Production process of blow-molded stainless steel chair |
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