CN204122550U - A kind of sheet material bag draws building mortion - Google Patents
A kind of sheet material bag draws building mortion Download PDFInfo
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- CN204122550U CN204122550U CN201420602174.0U CN201420602174U CN204122550U CN 204122550 U CN204122550 U CN 204122550U CN 201420602174 U CN201420602174 U CN 201420602174U CN 204122550 U CN204122550 U CN 204122550U
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Abstract
The utility model discloses a kind of sheet material bag and draw building mortion, comprise punch, die and for coordinating with the top end face of die the blank holder pushing down sheet material, blank holder is positioned at the top of die, described die is provided with and is convenient to the fillet that sheet material carries out drawing and forming, the position that described die is corresponding to fillet is provided with anti-inflation coil, described anti-inflation coil is ceoncentrically wound coil, and anti-inflation coil bulges for the sheet material region that makes to slide into die entrance place after being energized to the direction bending away from fillet thus forms bending and to bulge portion.The utility model arranges electromagnetic discharge coil by the fillet place at die, and the sheet material region making the fillet of die just right bending occurs and bulges, and effectively can improve the material flowability of the flange portion of sheet material, the final drawing and forming quality improving part.
Description
Technical field
The utility model belongs to Sheet drawing molding field, more specifically, relates to a kind of sheet material bag and draws building mortion.
Background technology
In traditional Sheet drawing forming technology, Pull crack defect usually produces at wall thickness change maximum.And the basic reason that workpiece breaks is born excessive tension due to workpiece sidewall load district during drawing and causes destruction.
The tension that during drawing, sidewall transmits is used for following three parts: the Deformation Resistance overcoming blank flange deformed area; Overcome the bending resistance of blank at die entrance place; Overcome various frictional dissipation.Ratio under normal circumstances shared by three is approximately respectively 70%, 20% and 10%.In order to improve the drawing depth of material, the mobility of the material of the flange portion of sheet material will be improved.This wherein the most effective way be on sheet material, apply inside thrust.
At document " initiatively hydraulic radial path is on the impact of cylindrical member Thickness Distribution " Liu Xiaojing etc., initiatively hydrodynamic deep drawing with independent radial is proposed.By independently hydraulic control is at forming blank flange applying independent radial hydraulic pressure, promotion flange sheet material flows to shaped region, coordinates the drawing of punch to be out of shape.Under the effect of rational liquid chamber pressure and independent radial hydraulic pressure coupling load path, can effectively suppress the transition bottom part ball thinning, and the final drawing that obtains is than the aluminium alloy ball bottomless drum shape part being 2.66.But compared with traditional deep-drawing technique, liquid filling deep-drawing forming also has some shortcomings, mainly comprises: the drawing pressure that 1) needs are larger and pressure-pad-force, significantly can increase equipment cost; 2) seal under high pressures difficulty.
Electromagnetic pulse forming is that one utilizes pulse magnet field force to carry out high-speed processing method to metal works, research shows: material can obtain higher than the forming property under conventional ones processing under high-speed deformation condition, and this phenomenon compared with high formability is called " high-ductility ".There are some researches show, electromagnetic forming method all can increase substantially the forming limit of the materials such as aluminium alloy, magnesium alloy, titanium alloy, steel alloy, copper.
In order to improve the drawing height of material under electro-magnetic forming mode.In document " Electromagnetically assisted sheet metal stamping ", American scholar G.S.Daehn seminar proposes electromagnetism and assists process for stamping and forming.Coil is embedded into the appropriate location in mould by this technique, and coil is moved along with punch die.In the mould decline forming process of each step, utilize electromagnetic force to make the drawing of sheet material bottom surface thinning, improve drip molding height with this.Compared with being shaped with conventional ones, electromagnetism assists process for stamping and forming to make the tensile fracture height of sheet material improve 44.3%.
In document " 5052 aluminum alloy plate materials electromagnetically assisted sheet metal stamping shaping deformational behavior and study mechanism ", the Liu great Hai etc. of domestic Harbin Institute of Technology proposes and adopts electromagnetism to assist Sheet Metal Forming Technology to realize the shaping of small fillet radius cylindrical part.The thinking of this technique is: first adopt the larger punch of radius of corner to be shaped and to have the cylindrical member profile of larger bottom roundings, and then adopts the mould structure being embedded with coil to reshape the electric discharge of bottom roundings position.Compared with common punching press, magnetic field impulse assist formation technique can significantly improve bottom roundings Problems in forming, obtains the small fillet radius cylindrical member that common method for drawing is difficult to obtain, improves the drawing height of material.But electromagnetic pulse assist stamping in, solenoid is electric discharge school, territory, stagnant zone, the local shape to workpiece, and the method does not solve the flow field problem of the material of the flange portion of sheet material, is difficult to the Forming depth increasing substantially material.
Patent No. CN103191971A, name is called that the utility model patent of " dissimilar metal clad plate material electromagnetism assist formation device and method " proposes in board hydraulic drawing process, by coil, radial electromagnetic force is applied to the flange outer rim of sheet material, to improve the mobility of the material of the flange portion of sheet material, and then solve in metal sheet forming process thinning seriously until the problem of breaking.But because electro-magnetic forming speed (Microsecond grade) is much larger than hydro-drawing speed (level second), hydraulic coupling and electromagnetic force are difficult to coordinate impel sheet deformation simultaneously, and coil is arranged in the end of sheet material, along with the distortion of sheet material, the end of sheet material is inwardly shunk, distance between the end of sheet material and coil increases, and coil is reduced the magnetic field force effect of sheet material, is unfavorable for the drawing and forming of sheet material.
Number of patent application CN103658297A, name is called in the utility model content of " the progressive drawing forming method of electromagnetic pulse assisted and device " and proposes, at blank holder corresponding to sheet material flange and die region, upper and lower radial boosting coil is set, where no matter sheet material end inwardly flow to, provides lasting electromagnetic push all can to sheet material end.In the punch region near sheet material, axial drawing coil is set.Two coils discharge together and carry out electromagnetism drawing, and punch presses down and implements progressive drawing and forming together subsequently.But axial drawing coil discharge can make the sheet material being attached to punch bottom face recur thinning bulging, axial drawing coil only acts on this part sheet material, is easy to crack, is unfavorable for drawing and forming.
At number of patent application CN203494978U, propose to carry out the reverse drawing of electromagnetism to sheet material in the utility model content that name is called " the progressive reverse drawing and forming device of annular electromagnetic pulse of sheet metal ".The layout of electromagnetic booster coil is consistent with number of patent application CN103658297A.Drawing coil is arranged on die by it, and this makes the sheet material region that each step electromagnetism drawing coil is corresponding all inconsistent with sheet material forced position before, thus can realize larger drawing depth.Although drawing coil is arranged in die, not at the fillet place of die, this makes whole building mortion too complicated, and is unfavorable for the machining stress state improving sheet material.In addition, drawing coil mainly works to the flange portion of sheet material, easily makes flange portion produce gauffer, affects the drawing quality of workpiece.
Utility model content
In drawing process, have for sheet material that material is thinning seriously easily to break and the problem such as forming height is shallow, propose a kind of sheet material bag and draw building mortion, by the fillet place at die, electromagnetic discharge coil is set, there is bending and bulge in the sheet material region making the fillet of die just right, sheet material is made progressively to wrap up the method shaping cylindrical member of punch by substep electric discharge, effectively can improve the material flowability of the flange portion of sheet material, the final drawing and forming quality improving workpiece.
For achieving the above object, according to an aspect of the present utility model, provide a kind of sheet material bag and draw building mortion, comprise punch, die and for coordinating with the top end face of die the blank holder pushing down sheet material, blank holder is positioned at the top of die, described die is provided with and is convenient to the fillet that sheet material carries out drawing and forming, the position that described die is corresponding to fillet is provided with anti-inflation coil, described anti-inflation coil is ceoncentrically wound coil, anti-inflation coil bulges for the sheet material position that makes to slide into the fillet place of die after being energized to the direction bending away from fillet thus forms bending and to bulge portion.
Preferably, described anti-inflation coil is installed in die, and the described bending portion of bulging is coated on punch.
Preferably, the half of the longitudinal section of anti-inflation coil is curved or rectangular.
Preferably, anti-inflation coil is combined by more than one subcoil.
Preferably, described blank holder and die are respectively equipped with solid matter coil and lower solid matter coil in the position of the flange portion corresponding to sheet material, described upper solid matter coil and lower solid matter coil are ceoncentrically wound coil, and upper solid matter coil and lower solid matter coil produce side direction electromagnetic force and push the flange portion of sheet material to punch under pulse current effect.
Preferably, described upper solid matter coil and lower solid matter coil are ceoncentrically wound coil.
Preferably, thruster coil is provided with between described blank holder and die, described thruster coil is ceoncentrically wound coil, thruster coil surrounds the flange portion of sheet material, and thruster coil produces the outer rim applying side force of side direction electromagnetic force to the flange portion of sheet material and pushes the flange portion of sheet material to punch under pulse current effect.
Preferably, thruster coil is ceoncentrically wound coil.
Preferably, described anti-inflation coil is ceoncentrically wound coil.
In general, the above technical scheme conceived by the utility model compared with prior art, owing to have employed anti-inflation coil, can obtain following beneficial effect:
1) electromagnetic discharge coil is set by the fillet place at die, it is anti-inflation to there is electromagnetism in the sheet material region making the fillet of die just right, the bending of electromagnetic force to the sheet material distortion that bulges plays a major role, punch presses down only that sheet material is stretching, therefore the advantage of electromagnetic pulse forming two-forty can be given full play to, adopt mould to the sheet material school shape after electromagnetic pulse forming simultaneously, realize the accurate manufacture of part;
2) by arranging anti-inflation coil corresponding with the fillet place of die, can pull the flange portion of sheet material material to the flowing of die endoporus, improve the mobility of the material of the flange portion of sheet material, the final drawing and forming quality improving part;
3) due to the flowing of material, the sheet material that during electric discharge, the fillet of die is corresponding each time, not in same region, changes conventional panels electromagnetic pulse forming and always makes the thinning mode of texturing of same region bulging, can improve drawing quality;
4) there is small deformation in the sheet material region that the fillet of die is corresponding, reduce the gross energy of power-supply system, reduce equipment scale under electromagnetic force at every turn, therefore can effective economize energy and saving production cost.
Accompanying drawing explanation
Fig. 1 a is the original state schematic diagram that works in embodiment 1 in the utility model;
Fig. 1 b is that in the utility model, embodiment 1 convex mould presses down the rear schematic diagram that is shaped for the first time;
Fig. 1 c is the magnetic line of force distribution schematic diagram in the utility model in embodiment 1 after anti-inflation coil discharge around sheet material;
Fig. 1 d is the magnetic field force distribution schematic diagram in the utility model in embodiment 1 after anti-inflation coil discharge on sheet material;
Fig. 1 e is the distortion schematic diagram of the rear sheet material of anti-inflation coil first time electric discharge in embodiment 1 in the utility model;
Fig. 1 f is that in the utility model, embodiment 1 convex mould second time presses down the schematic diagram to sheet material school shape;
Fig. 1 g is the distortion schematic diagram of the rear sheet material of anti-inflation coil second time electric discharge in embodiment 1 in the utility model;
Fig. 1 h is that in the utility model, embodiment 1 convex mould presses down schematic diagram final after the shape of sheet material school for the last time;
Fig. 2 a is the original state schematic diagram that works in embodiment 2 in the utility model;
Fig. 2 b is that in the utility model, embodiment 2 convex mould presses down the rear schematic diagram that is shaped for the first time;
Fig. 2 c is the magnetic line of force distribution schematic diagram in the utility model in embodiment 2 after anti-inflation coil and upper solid matter coil, lower solid matter coil discharge around sheet material;
Fig. 2 d is the magnetic field force distribution schematic diagram in the utility model in embodiment 2 after anti-inflation coil and upper solid matter coil, lower solid matter coil discharge on sheet material;
Fig. 2 e is the distortion schematic diagram of sheet material after first time electric discharge after anti-inflation coil and upper solid matter coil, lower solid matter coil discharge in embodiment 2 in the utility model;
Fig. 2 f is that in the utility model, embodiment 2 convex mould second time presses down the schematic diagram to sheet material school shape;
Fig. 2 g is the distortion schematic diagram of sheet material after second time electric discharge after anti-inflation coil and upper solid matter coil, lower solid matter coil discharge in embodiment 2 in the utility model;
Fig. 2 h is that in the utility model, embodiment 2 convex mould presses down schematic diagram final after the shape of sheet material school for the last time;
Fig. 3 a is the original state schematic diagram that works in embodiment 3 in the utility model;
Fig. 3 b is that in the utility model, embodiment 3 convex mould presses down the rear schematic diagram that is shaped for the first time;
Fig. 3 c is the magnetic line of force distribution schematic diagram in the utility model in embodiment 3 after anti-inflation coil, thruster coil and upper solid matter coil, lower solid matter coil discharge around sheet material;
Fig. 3 d is the magnetic field force distribution schematic diagram in the utility model in embodiment 3 after anti-inflation coil, thruster coil and upper solid matter coil, lower solid matter coil discharge on sheet material;
Fig. 3 e is the distortion schematic diagram of sheet material after discharging for the first time after anti-inflation coil, thruster coil and upper solid matter coil, lower solid matter coil discharge in embodiment 3 in the utility model;
Fig. 3 f is that in the utility model, embodiment 3 convex mould second time presses down the schematic diagram to sheet material school shape;
Fig. 3 g is the distortion schematic diagram of sheet material after discharging for the second time after anti-inflation coil, thruster coil and upper solid matter coil, lower solid matter coil discharge in embodiment 3 in the utility model;
Fig. 3 h is that in the utility model, embodiment 3 convex mould presses down schematic diagram final after the shape of sheet material school for the last time;
Schematic diagram when Fig. 4 a is every circle dislocation arrangement of anti-inflation coil in the utility model;
Fig. 4 b be the half of anti-inflation coil longitudinal section in the utility model curved time schematic diagram;
The schematic diagram that Fig. 5 is the major part of the every circle of ceoncentrically wound coil in the utility model when being arc section;
The schematic diagram that Fig. 6 is the major part of the every circle of ceoncentrically wound coil in the utility model when being non-arc section.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each embodiment of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
Embodiment 1
With reference to Fig. 1 a ~ Fig. 1 h, a kind of sheet material bag draws building mortion, comprise punch 1, die 2 and for coordinating the blank holder 3 pushing down sheet material 5 with the top end face of die 2, sheet material 5 is produced flange portion 51 after deep-drawing deformation, flange portion 51 refers to the undeformed annular section of level on sheet material 5, and the flange portion 51 of sheet material 5 is mainly pushed down in the after this effect of blank holder 3.
Blank holder 3 is positioned at the top of die 2, described die 2 is provided with and is convenient to the fillet 21 that sheet material 5 carries out drawing and forming, the position that described die 2 is corresponding to fillet 21 is provided with anti-inflation coil 4, one as the present embodiment is preferred, described anti-inflation coil 4 is ceoncentrically wound coil, anti-inflation coil 4 bulges for sheet material 5 region that makes to slide into fillet 21 place of die 2 after being energized to the direction bending away from fillet 21 thus forms bending and to bulge portion 52, shape and the structure of anti-inflation coil 4 are not limited to shown in Fig. 1 a, its position can move up or down, its internal diameter also can be larger, cross-sectional area also can be larger, as long as the position that sheet material 5 can be made to flow to fillet 21 place of die 2 raises up and produces bending and to bulge portion 52.
Described anti-inflation coil 4 is powered by power-supply system, and described anti-inflation coil 4 is installed in die 2, and the described bending portion 52 that bulges is coated on punch 1.Anti-inflation coil 4 can be combined by more than one subcoil, and these subcoils mutually superpose and form anti-inflation coil 4.
Anti-inflation coil 4 when mounted, first can arrange coil recess, then is arranged in this coil recess by anti-inflation coil 4, and then use epoxy sealing in fillet 21 place of die 2.
Described power-supply system comprises power supply, storage capacitor, divider resistance and switch, and described anti-inflation coil 4 is electrically connected with this power-supply system and connects.
With reference to Fig. 4 a, Fig. 4 b, be two kinds of shapes of anti-inflation coil 4, two circles up and down that Fig. 4 a shows anti-inflation coil 4 can misplace arrangement, and in addition, Fig. 4 b shows the half of anti-inflation coil 4 longitudinal section can be curved.
The manufacturing process of above-mentioned electromagnetic pulse outsourcing distributive discharge is adopted specifically to comprise:
As shown in Figure 1a, be first positioned between blank holder 3 and die 2 by sheet material 5 to be formed, apply pressure to punch 1 and make its first time press down the distance of setting, the sheet material 5 treating shaping carries out preform, as shown in Figure 1 b.The storage capacitor of power-supply system is charged, after charging voltage reaches shaping voltage, disconnects charge circuit.The switch of closed electrical origin system, storage capacitor is discharged to anti-inflation coil 4 by cable.The magnetic line of force after anti-inflation coil 4 discharges around sheet material 5 and magnetic field force distribution, as shown in Fig. 1 c, Fig. 1 d, can see that the magnetic field force on the corresponding sheet material of fillet 21 5 of die 2 can be analyzed to axial and radial both direction.It is anti-inflation that axial force of magnetic field makes sheet material 5 occur, and radial magnetic field power pulls the material of the flange portion 51 of sheet material 5 to flow to die 2 endoporus.Under magnetic field force effect in Fig. 1 d there is distortion as shown in fig. le in sheet material 5, and the sheet material 5 that namely fillet 21 region of die 2 is corresponding occurs anti-inflation and heaves.Punch 1 second time presses down, and the part that sheet material 5 under first time electromagnetic force is heaved is evened up, as shown in Figure 1 f.The storage capacitor of power-supply system is charged again, after charging voltage reaches shaping voltage, disconnects charge circuit.The switch of closed electrical origin system, storage capacitor is by the electric discharge of cable proofreader circle second time, and anti-inflation heaving occurs the sheet material 5 of die 2 correspondence, as shown in Figure 1 g.Repeat above-mentioned steps, sheet material 5 is constantly anti-inflation by magnetic field force and heave and form bending bulging portion 52 at the material at fillet 21 place of die 2, and then a part of material in bending bulging portion 52 draws in the inner chamber of die 2 and another part is evened up and be attached on the fillet 21 of die 2; The width of flange portion 51 also constantly diminishes in the process, until punch 1 presses down for the last time, the part that sheet material 5 under last electromagnetic force is heaved is evened up.Finally complete the drawing and forming of sheet material 5, as shown in figure 1h.
Embodiment 2
With reference to Fig. 2 a ~ Fig. 2 h, the difference of itself and embodiment 1 is on the basis of embodiment 1, described blank holder 3 and die 2 are respectively equipped with solid matter coil 6 and lower solid matter coil 7 in the position of the flange portion 51 corresponding to sheet material 5, one as the present embodiment is preferred, described upper solid matter coil 6 and lower solid matter coil 7 are ceoncentrically wound coil, and upper solid matter coil 6 and lower solid matter coil 7 produce side direction electromagnetic force and push the flange portion 51 of sheet material 5 to punch 1 under pulse current effect.
Sheet material bag described in embodiment 2 draws the drawing forming method of building mortion as follows:
As shown in Figure 2 a, first sheet material 5 to be formed is positioned between blank holder 3 and die 2.Upper solid matter coil 6, lower solid matter coil 7 are arranged in the groove on blank holder 3 corresponding to sheet material 5 flange and die 2.Applying pressure to punch 1 makes its first time press down the distance of setting, and the sheet material 5 treating shaping carries out preform, makes the diameter of sheet material 5 end be less than solid matter coil 6, lower solid matter coil 7 outermost layer diameter, as shown in Figure 2 b.The storage capacitor of power-supply system is charged, after charging voltage reaches shaping voltage, disconnects charge circuit.The switch of closed electrical origin system, storage capacitor is discharged to anti-inflation coil 4, upper solid matter coil 6 and lower solid matter coil 7 by cable.The magnetic line of force after the electric discharge of anti-inflation coil 4, upper solid matter coil 6 and lower solid matter coil 7 around sheet material 5 and magnetic field force distribution are as shown in Fig. 2 c, 2d.It is anti-inflation that axial force of magnetic field on the corresponding sheet material of fillet 21 5 of die 2 makes sheet material 5 occur, and radial magnetic field power pulls the material of the flange portion 51 of sheet material 5 to flow to die 2 endoporus.Sheet material 5 end that acts on of upper solid matter coil 6, lower solid matter coil 7 produces the electromagnetic force pointing to die 2 endoporus, and the material promoting the flange portion 51 of sheet material 5 flows to die 2 endoporus.The mobility of the material of the flange portion 51 that anti-inflation coil 4, upper solid matter coil 6 and lower solid matter coil 7 acting in conjunction can improve further.Under magnetic field force effect in Fig. 2 d there is distortion as shown in Figure 2 e in sheet material 5, and the sheet material 5 that namely fillet 21 region of die 2 is corresponding occurs anti-inflation and heaves.Punch 1 second time presses down, and the part that sheet material 5 under first time electromagnetic force is heaved is evened up, as shown in figure 2f.The storage capacitor of power-supply system is charged again, after charging voltage reaches shaping voltage, disconnects charge circuit.The switch of closed electrical origin system, storage capacitor is by the electric discharge of cable proofreader circle second time, and anti-inflation heaving occurs the sheet material 5 of die 2 correspondence, as shown in Figure 2 g.Repeat above-mentioned steps, sheet material 5 is constantly anti-inflation by magnetic field force and heave and form bending bulging portion 52 at the material at fillet 21 place of die 2, and then a part of material in then bending bulging portion 52 of bending bulging portion 52 draws in the inner chamber of die 2 and another part is evened up and be attached on the fillet 21 of die 2; The width of flange portion 51 also constantly diminishes in the process, until punch 1 presses down for the last time, the part that sheet material 5 under last electromagnetic force is heaved is evened up.Finally complete the drawing and forming of sheet material 5, as shown in fig. 2h.
Embodiment 3
With reference to Fig. 3 a ~ Fig. 3 h, embodiment 3 is with the difference part of embodiment 2, on the basis of embodiment 2, thruster coil 8 is provided with between described blank holder 3 and die 2, one as the present embodiment is preferred, described thruster coil 8 is ceoncentrically wound coil, and thruster coil 8 surrounds the flange portion 51 of sheet material 5, and thruster coil 8 produces the outer rim applying side direction electromagnetic force of side-thrust to the flange portion 51 of sheet material 5 and pushes the flange portion 51 of sheet material 5 to punch 1 under pulse current effect.
Sheet material bag described in embodiment 3 draws the drawing forming method of building mortion as follows:
As shown in Figure 3 a, first sheet material 5 to be formed is positioned between blank holder 3 and die 2.Upper solid matter coil 6, lower solid matter coil 7 and thruster coil 8 are arranged in the groove on blank holder 3 and die 2.Applying pressure to punch 1 makes its first time press down the distance of setting, and the sheet material 5 treating shaping carries out preform, as shown in Figure 3 b.The storage capacitor of power-supply system is charged, after charging voltage reaches shaping voltage, disconnects charge circuit.The switch of closed electrical origin system, storage capacitor is discharged to anti-inflation coil 4, upper solid matter coil 6, lower solid matter coil 7 and thruster coil 8 by cable.The magnetic line of force after anti-inflation coil 4, thruster coil 8, upper solid matter coil 6 and the electric discharge of lower solid matter coil 7 around sheet material 5 and magnetic field force distribution are as shown in Fig. 3 c, 3d.It is anti-inflation that axial force of magnetic field on the corresponding sheet material of fillet 21 5 of die 2 makes sheet material 5 occur, and radial magnetic field power pulls the material of the flange portion 51 of sheet material 5 to flow to die 2 endoporus.Sheet material 5 end that acts on of thruster coil 8, upper solid matter coil 6 and lower solid matter coil 7 produces the electromagnetic force pointing to die 2 endoporus, and the material promoting the flange portion 51 of sheet material 5 flows to die 2 endoporus.The mobility of the material of the flange portion 51 that anti-inflation coil 4, thruster coil 8, upper solid matter coil 6 and the acting in conjunction of lower solid matter coil 7 can further improve.Under magnetic field force effect in Fig. 3 d there is distortion as shown in Figure 3 e in sheet material 5, and the sheet material 5 that namely fillet 21 region of die 2 is corresponding occurs anti-inflation and heaves.Punch 1 second time presses down, and the part that sheet material 5 under first time electromagnetic force is heaved is evened up, as illustrated in figure 3f.The storage capacitor of power-supply system is charged again, after charging voltage reaches shaping voltage, disconnects charge circuit.The switch of closed electrical origin system, storage capacitor is by the electric discharge of cable proofreader circle second time, and anti-inflation heaving occurs the sheet material 5 of die 2 correspondence, as shown in figure 3g.Repeat above-mentioned steps, sheet material 5 is constantly anti-inflation by magnetic field force and heave and form bending bulging portion 52 at the material at fillet 21 place of die 2, and then a part of material in then bending bulging portion 52 of bending bulging portion 52 draws in the inner chamber of die 2 and another part is evened up and be attached on the fillet 21 of die 2; The width of flange portion 51 also constantly diminishes in the process, until punch 1 presses down for the last time, the part that sheet material 5 under last electromagnetic force is heaved is evened up.Finally complete the drawing and forming of sheet material 5, as shown in Fig. 3 h.
Finally, for the ceoncentrically wound coil mentioned in the utility model embodiment 1 ~ embodiment 3, its shape is with reference to Fig. 5 and Fig. 6.In Fig. 5, the major part of every circle is circular arc, and in Fig. 6, the major part of every circle is non-circular.The number of turn of coil shown in figure is three circles, and during actual use, the number of turn can change certainly.In figure, the major part of all circles is all concentric, and namely center overlaps, and only have few part for being connected to other circle and bending to some extent, namely the junction of its adjacent two circles can be implemented to connect with little bending section, concentric to ensure all circles.Ceoncentrically wound coil can be a circle also can be multiturn, can be one deck also can be that multilayer superposes up and down.
Why adopt ceoncentrically wound coil, because after punch 1 pair of sheet material 5 preform, sheet material 5 is coated on to the part at fillet 21 place of die 2, ceoncentrically wound coil can produce uniform magnetic field force to this part, the magnetic force distribution of this part is more even, thus make anti-inflation bending bulge portion 52 evenly, drawing quality can be significantly improved.
In addition, anti-inflation coil 4, upper solid matter coil 6, lower solid matter coil 7 and thruster coil 8 also can be non-ceoncentrically wound coils, namely can decentraction between circle and circle, such as common spiral winding, are decentraction between its adjacent turn.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (9)
1. a sheet material bag draws building mortion, comprise punch (1), die (2) and for coordinating the blank holder (3) pushing down sheet material (5) with the top end face of die (2), blank holder (3) is positioned at the top of die (2), described die (2) is provided with and is convenient to the fillet (21) that sheet material (5) carries out drawing and forming, it is characterized in that: the position that described die (2) is corresponding to fillet (21) is provided with anti-inflation coil (4), anti-inflation coil (4) to bulge portion (52) for making sheet material (5) position at fillet (21) place sliding into die (2) bulge to the direction bending away from fillet (21) thus form bending after energising.
2. a kind of sheet material bag according to claim 1 draws building mortion, it is characterized in that: described anti-inflation coil (4) is installed in die (2), and the described bending portion (52) that bulges is coated on punch (1).
3. a kind of sheet material bag according to claim 1 draws building mortion, it is characterized in that: the half of the longitudinal section of anti-inflation coil (4) is curved or rectangular.
4. a kind of sheet material bag according to claim 1 draws building mortion, it is characterized in that: anti-inflation coil (4) is combined by more than one subcoil.
5. a kind of sheet material bag according to claim 1 draws building mortion, it is characterized in that: described blank holder (3) and die (2) are respectively equipped with upper solid matter coil (6) and lower solid matter coil (7) in the position of the flange portion (51) corresponding to sheet material (5), and upper solid matter coil (6) and lower solid matter coil (7) produce side direction electromagnetic force and push the flange portion (51) of sheet material (5) to punch (1) under pulse current effect.
6. a kind of sheet material bag according to claim 5 draws building mortion, it is characterized in that: described upper solid matter coil (6) and lower solid matter coil (7) are ceoncentrically wound coil.
7. a kind of sheet material bag according to claim 1 draws building mortion, it is characterized in that: between described blank holder (3) and die (2), be provided with thruster coil (8), thruster coil (8) surrounds the flange portion (51) of sheet material (5), and thruster coil (8) produces the outer rim applying side force of side direction electromagnetic force to the flange portion (51) of sheet material (5) and pushes the flange portion (51) of sheet material (5) to punch (1) under pulse current effect.
8. a kind of sheet material bag according to claim 7 draws building mortion, it is characterized in that: thruster coil (8) is ceoncentrically wound coil.
9. the sheet material bag according to claim arbitrary in claim 1 ~ 8 draws building mortion, it is characterized in that: described anti-inflation coil (4) is ceoncentrically wound coil.
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| CN201420602174.0U CN204122550U (en) | 2014-10-17 | 2014-10-17 | A kind of sheet material bag draws building mortion |
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| CN201420602174.0U CN204122550U (en) | 2014-10-17 | 2014-10-17 | A kind of sheet material bag draws building mortion |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353718A (en) * | 2014-10-17 | 2015-02-18 | 华中科技大学 | Plate packaging and drawing forming device and forming method |
| CN107138591A (en) * | 2017-06-19 | 2017-09-08 | 中南大学 | A kind of electromagnetic forming device and manufacturing process of cylindrical member fillet |
| CN108543847A (en) * | 2018-03-22 | 2018-09-18 | 中南大学 | A kind of electromagnetic forming device and method improving the plank hole flanging limit and quality |
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2014
- 2014-10-17 CN CN201420602174.0U patent/CN204122550U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353718A (en) * | 2014-10-17 | 2015-02-18 | 华中科技大学 | Plate packaging and drawing forming device and forming method |
| CN104353718B (en) * | 2014-10-17 | 2016-03-02 | 华中科技大学 | A kind of sheet material bag draws the method for building mortion and shaping |
| CN107138591A (en) * | 2017-06-19 | 2017-09-08 | 中南大学 | A kind of electromagnetic forming device and manufacturing process of cylindrical member fillet |
| CN107138591B (en) * | 2017-06-19 | 2020-01-10 | 中南大学 | Electromagnetic forming device and method for cylindrical part fillet |
| CN108543847A (en) * | 2018-03-22 | 2018-09-18 | 中南大学 | A kind of electromagnetic forming device and method improving the plank hole flanging limit and quality |
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