CN109570364B - Electric field auxiliary forming die for ultrahigh-strength multi-channel bent part - Google Patents
Electric field auxiliary forming die for ultrahigh-strength multi-channel bent part Download PDFInfo
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- CN109570364B CN109570364B CN201910072814.9A CN201910072814A CN109570364B CN 109570364 B CN109570364 B CN 109570364B CN 201910072814 A CN201910072814 A CN 201910072814A CN 109570364 B CN109570364 B CN 109570364B
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- 230000005684 electric field Effects 0.000 title claims abstract description 54
- 238000005452 bending Methods 0.000 claims abstract description 84
- 239000002184 metal Substances 0.000 claims abstract description 21
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 52
- 230000008569 process Effects 0.000 abstract description 49
- 238000007599 discharging Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 238000010304 firing Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
- B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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Abstract
本发明公开一种超高强度多道弯曲件的电场辅助成形模具，包括上、下模座，下模座上设置有导柱，上模座通过导套与导柱滑动连接；上模座与弯曲凸模、垫板、压边块等构成模具上模，在弯曲凸模上有三个正电极并且外表有绝缘套；在两个金属压边块与弯曲凹模上分别有两个负电极并且同时带有绝缘套，电极均与电源连接；下模座与弯曲凹模等构成模具下模，同时保证弯曲过程中正电极与负电极构成回路。其主要改善了现有板材弯曲成形工艺，在现有冲压模具基础上改变相应结构，使其与外加电场相结合，解决超高强度板料在弯曲过程中出现的回弹大、难以弯曲等问题；改善了其弯曲成形特性，使其达到弯曲工件的成形要求，并提高模具的使用寿命。
The invention discloses an electric field-assisted forming mold for ultra-high-strength multi-channel bending parts. Bending punches, backing plates, blank holders, etc. constitute the upper mould of the mould. There are three positive electrodes on the bending punches and an insulating sleeve on the surface; there are two negative electrodes on the two metal blank holders and the bending die respectively. At the same time, it has an insulating sleeve, and the electrodes are connected to the power supply; the lower die base and the bending die form the lower die of the die, and at the same time ensure that the positive electrode and the negative electrode form a loop during the bending process. It mainly improves the existing sheet bending forming process, changes the corresponding structure on the basis of the existing stamping die, and combines it with the external electric field to solve the problems of large springback and difficulty in bending of the ultra-high-strength sheet during the bending process. ; Improve its bending and forming characteristics, so that it can meet the forming requirements of curved workpieces, and improve the service life of the mold.
Description
Technical Field
The invention relates to the technical field of forming dies, in particular to an electric field auxiliary forming die for an ultrahigh-strength multi-channel bent part.
Background
The bending forming is a process of making a plate material or an annular blank into a required bent shape by using a bending die under the pressure action of a press machine. The method is one of basic stamping processes, and can be used for processing thin-wall parts and annular parts with various complex shapes; the dimensions of the curved parts are also varied and they are widely used in automobiles, airplanes, tractors, motorcycles, clocks, electrical appliances, instruments, light industry, military and civilian products. In the actual bending forming process, the phenomena of inner side instability and wrinkling, severe bending resilience, poor forming performance and the like can occur, and the surface quality, hardness, strength, toughness, service life and other properties of the workpiece can be affected to different degrees as a result. Especially, the ultra-high strength thin plate material is more difficult to bend and the phenomenon of bending rebound is more serious compared with other traditional materials. The ultrahigh-strength material has higher strength but poorer plasticity, so that a series of problems of incapability of bending, serious resilience, poorer precision and the like can be caused by adopting a common stamping die. In a general stamping process, the tensile stress generated by tensile deformation of a neutral layer is reduced or the material stress distribution in a deformation area is changed, so that the tensile stress is reduced, the phenomenon of thinning the outer side wall is reduced by a method of enhancing the compressive stress, and the phenomenon of bending and rebounding can be corrected only by a large amount of experiments and reasonable empirical data. The bending springback phenomenon is always an unavoidable problem of the traditional bending die, and particularly, materials with large elastic modulus are more difficult to bend and form, so that the precision and the quality of products are affected, and the technical problem is formed. In summary, how to solve the quality and precision problems of the ultra-high strength bending piece products has become a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide an electric field auxiliary forming die for an ultrahigh-strength multi-channel bent part, which aims to solve the problems that an ultrahigh-strength thin plate is serious in rebound phenomenon and difficult to bend in the bending process.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an electric field auxiliary forming die for an ultrahigh-strength multi-channel bent part, which comprises an upper die holder and a lower die holder, wherein the lower die holder is provided with at least two guide pillars, and the upper die holder is in sliding connection with the guide pillars through correspondingly arranged guide sleeves;
a die handle is embedded above the upper die base, and a male die base plate is fixed below the upper die base; the bottom end of the male die base plate is connected with a male die fixing plate used for fixing a bending male die and a discharging screw, the center of a working contact surface of the bending male die is sleeved with three positive electrodes, and the front surfaces of the positive electrodes are provided with binding post anodes of an external power supply live wire; the discharging screws with springs sleeved on the peripheries are fixed on the edges of two sides of the bottom end of the male die fixing plate, and metal edge pressing blocks are fixedly connected to the bottom ends of the discharging screws; the center of the lower surface of the metal edge pressing block, which is contacted with the workpiece, is sleeved with a negative electrode, and the front surface of the negative electrode is provided with a zero line externally connected with a power supply;
the top of the lower die holder is sequentially fixed with a female die base plate, a female die fixing plate and a bending female die, two negative electrodes are sleeved at the center of a working contact surface of the bending female die, and the front surfaces of the negative electrodes are provided with binding post cathodes externally connected with a power supply zero line.
Preferably, the top fixing part and the working part of the bending male die are arranged in a step shape, an insulating sleeve is sleeved outside a positive electrode arranged on the lower surface of the bending male die, which is in contact with a workpiece, and the positive electrode and the insulating sleeve are in interference fit; the front surface of the bending male die is provided with three round holes connected with the positive pole of the binding post.
Preferably, the male die fixing plate is provided with a groove corresponding to the bending male die, and the upper die base and the fixed base plate, the fixed base plate and the male die fixing plate and the bending male die are fastened by bolts or screws; the front surface of the male die fixing plate is provided with three round holes corresponding to the round holes on the front surface of the bending male die, and the three round holes on the front surface of the male die fixing plate are used for placing a male die firing line.
Preferably, an insulating sleeve is sleeved outside a negative electrode sleeved at the center of the lower surface of the metal edge pressing block, which is in contact with the workpiece, the negative electrode and the insulating sleeve are in interference fit, and a round hole connected with the negative electrode of the binding post is formed in the front surface of the metal edge pressing block.
Preferably, the bottom fixing part and the working part of the bending female die are arranged in a step shape, two negative electrodes sleeved at the center of the contact surface of the bending female die and the workpiece are sleeved with insulating sleeves, and the negative electrodes and the insulating sleeves are in interference fit; and the front surface of the bending female die is provided with two round holes connected with the negative pole of the binding post.
Preferably, a groove corresponding to the bending die is formed in the die fixing plate, two round holes are formed in the front surface of the die fixing plate, the positions of the two round holes correspond to the positions of the two round holes in the front surface of the bending die, and the two round holes are used for placing a die zero line.
Preferably, a material baffle plate is arranged at one side, located on the female die fixing plate, of the top end of the lower die base.
Compared with the prior art, the invention has the following technical effects:
the electric field auxiliary forming die for the ultrahigh-strength multi-channel bent part overcomes the bending forming limitation of ultrahigh-strength materials, and combines the traditional stamping die with an electric field; the blank is directly heated by joule resistance heat generated by current flowing through the ultrahigh-strength blank, the temperature of the blank is kept within a forming temperature range, the blank is plastically deformed in a die, the internal temperature of the blank is very uniformly distributed, and the current distribution of a workpiece is stable and uniform by arranging a plurality of electrodes, so that the plastic forming of the blank is facilitated, and the product quality is improved; meanwhile, the defects of bending cracks, serious rebound phenomenon and the like in the traditional bending forming process can be effectively reduced. In addition, the bending device provided by the invention has the characteristics of strong insulativity, simple structure, high forming efficiency, low energy consumption, stable product quality and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a three-dimensional schematic view of one direction of the electric field assisted forming process and die design for an ultra-high strength multi-pass curved part of the present invention;
FIG. 2 is a three-dimensional schematic view of another direction of the electric field assisted forming process and die design for an ultra-high strength multi-pass curved part of the present invention;
FIG. 3 is a schematic perspective view of a mold shank for use in the electric field assisted forming process and mold design of an ultra-high strength multi-pass curved part of the present invention;
FIG. 4 is a schematic perspective view of an upper die holder in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part according to the present invention;
FIG. 5 is a schematic perspective view of a male die plate in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part of the present invention;
FIG. 6 is a schematic perspective view of a convex mold fixing plate in the electric field assisted forming process and mold design of the ultra-high strength multi-pass bent part of the present invention;
FIG. 7 is a schematic perspective view of a metallic compact and its electrode assembly in the electric field assisted forming process and mold design of the ultra-high strength multi-pass curved part of the present invention;
FIG. 8 is a schematic perspective view of a female mold holding plate in the electric field assisted forming process and mold design of an ultra-high strength multi-pass curved part of the present invention;
FIG. 9 is a schematic perspective view of a female die plate in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part according to the present invention;
FIG. 10 is a schematic perspective view of an electric field assisted forming process and a lower die holder in a die design for an ultra-high strength multi-pass bent part according to the present invention;
FIG. 11 is a schematic perspective view of a bending punch and its electrode assembly in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part of the present invention;
FIG. 12 is a schematic perspective view of a retainer plate in the electric field assisted forming process and die design of the ultra-high strength multi-pass curved part of the present invention;
FIG. 13 is a schematic perspective view of a bending die and its electrode assembly in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part according to the present invention;
FIG. 14 is a perspective view of the guide posts in the electric field assisted forming process and die design of the ultra-high strength multi-pass curved part of the present invention;
FIG. 15 is a perspective view of a spring in an electric field assisted forming process and die design for an ultra-high strength multi-pass curved part of the present invention;
FIG. 16 is a schematic perspective view of a discharge screw in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part of the present invention;
FIG. 17 is a schematic perspective view of the guide sleeve in the electric field assisted forming process and die design of the ultra-high strength multi-pass curved part of the present invention;
in the figure: 1. a die shank; 2. an upper die holder; 3. a male die backing plate; 4. a male die fixing plate; 4.1, firing line; 5. a metal edge pressing block; 5-1, zero line; 5-2, insulating sleeve; 5-3, a negative electrode; 6. fixing a female die plate; 6.1, a zero line; 7. a die base plate; 8. a lower die holder; 9. bending the male die; 9.1, an insulating sleeve; 9-2, a positive electrode; 10. a striker plate; 11. bending the female die; 11-1, an insulating sleeve; 11-2 negative electrodes; 12. a guide post; 13. a spring; 14. a discharge screw; 15. and (4) guiding a sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an electric field auxiliary forming die for an ultrahigh-strength multi-channel bent part, which aims to solve the problems that an ultrahigh-strength thin plate is serious in rebound phenomenon and difficult to bend in the bending process.
Based on the electric field auxiliary forming die for the ultrahigh-strength multi-channel bent part, the electric field auxiliary forming die comprises an upper die holder and a lower die holder, wherein the lower die holder is provided with at least two guide pillars, and the upper die holder is in sliding connection with the guide pillars through correspondingly arranged guide sleeves; a die handle is embedded above the upper die base, and a convex die base plate is fixed below the upper die base; the bottom end of the male die base plate is connected with a male die fixing plate used for fixing a bending male die and a discharging screw, the center of the working contact surface of the bending male die is sleeved with three positive electrodes, and the front surface of each positive electrode is provided with a binding post positive electrode of an external power supply live wire; the discharging screws with springs sleeved on the peripheries are fixed on the edges of two sides of the bottom end of the male die fixing plate, and the bottom ends of the discharging screws are fixedly connected with metal edge pressing blocks; the center of the lower surface of the metal edge pressing block, which is contacted with the workpiece, is sleeved with a negative electrode, and the front surface of the negative electrode is provided with a zero line externally connected with a power supply; the top of the lower die holder is sequentially fixed with a female die backing plate, a female die fixing plate and a bending female die, two negative electrodes are sleeved at the center of the working contact surface of the bending female die, and the front surfaces of the negative electrodes are provided with binding post cathodes externally connected with a power supply zero line.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-17, fig. 1 is a three-dimensional schematic view showing one direction of the electric field assisted forming process and the mold design of the ultra-high strength multi-pass bending member of the present invention; FIG. 2 is a three-dimensional schematic view of another direction of the electric field assisted forming process and die design for an ultra-high strength multi-pass curved part of the present invention; FIG. 3 is a schematic perspective view of a mold shank for use in the electric field assisted forming process and mold design of an ultra-high strength multi-pass curved part of the present invention; FIG. 4 is a schematic perspective view of an upper die holder in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part according to the present invention; FIG. 5 is a schematic perspective view of a male die plate in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part of the present invention; FIG. 6 is a schematic perspective view of a convex mold fixing plate in the electric field assisted forming process and mold design of the ultra-high strength multi-pass bent part of the present invention; FIG. 7 is a schematic perspective view of a metallic compact and its electrode assembly in the electric field assisted forming process and mold design of the ultra-high strength multi-pass curved part of the present invention; FIG. 8 is a schematic perspective view of a female mold holding plate in the electric field assisted forming process and mold design of an ultra-high strength multi-pass curved part of the present invention; FIG. 9 is a schematic perspective view of a female die plate in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part according to the present invention; FIG. 10 is a schematic perspective view of an electric field assisted forming process and a lower die holder in a die design for an ultra-high strength multi-pass bent part according to the present invention; FIG. 11 is a schematic perspective view of a bending punch and its electrode assembly in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part of the present invention; FIG. 12 is a schematic perspective view of a retainer plate in the electric field assisted forming process and die design of the ultra-high strength multi-pass curved part of the present invention; FIG. 13 is a schematic perspective view of a bending die and its electrode assembly in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part according to the present invention; FIG. 14 is a perspective view of the guide posts in the electric field assisted forming process and die design of the ultra-high strength multi-pass curved part of the present invention; FIG. 15 is a perspective view of a spring in an electric field assisted forming process and die design for an ultra-high strength multi-pass curved part of the present invention; FIG. 16 is a schematic perspective view of a discharge screw in the electric field assisted forming process and die design of an ultra-high strength multi-pass curved part of the present invention; fig. 17 is a perspective view of the guide sleeve in the electric field assisted forming process and the die design of the ultra-high strength multi-pass bending member of the present invention.
As shown in fig. 1 to 17, the invention provides an electric field auxiliary forming die for an ultrahigh-strength multi-channel bent part, which comprises an upper die holder 2 and a lower die holder 8, wherein a guide mechanism is arranged between the upper die holder 2 and the lower die holder 8, the guide mechanism comprises a die holder guide sleeve 15 arranged on the upper die holder 2 and a die holder guide post 12 arranged on the lower die holder 8, the die holder guide post 12 is embedded in the die holder guide sleeve 15, and the die holder guide sleeve 15 can slide along the axial direction of the die holder guide post 12, so that the upper die holder 2 can vertically move along the direction of the lower die holder 8. The upper part of the upper die holder 2 is embedded with a die handle 1 device, as shown in figure 3.
A convex die backing plate 3 is arranged below the upper die holder 2 to prevent the upper die holder from being damaged due to overlarge stress in the working process; the periphery of the punch backing plate 3 is provided with six threaded holes for fastening the punch backing plate with the upper die base 2 and the punch retainer 4, as shown in fig. 5. A male die fixing plate 4 is arranged below the male die base plate 3, and a step-shaped groove is formed in the center of the male die fixing plate 4 and used for fixing a bending male die 9; four through holes are arranged around the discharging screw 14; six threaded holes are formed for fixing the male die base plate 3 and the upper die base 2; a round hole corresponding to the bending male die 9 is arranged on the front surface of the bending male die and is used for connecting the positive pole of the binding post of the external power supply live wire 4-1, as shown in figure 6. The male die fixing plate 4, the male die base plate 3 and the upper die frame 2 are connected through screws and bolts, and positioning pins are preferably arranged at two ends of the male die base plate 3, so that the positioning is convenient. A bending male die 9, four discharging screws 14 and four springs 13 are arranged below the male die fixing plate 4; the bending male die 9 is arranged in a step shape and is used for fastening with the male die fixing plate 4; three round holes with certain depth are arranged on the lower surface of the workpiece, which is in contact with the workpiece, and are used for placing the positive electrodes 9-2, meanwhile, an insulating sleeve 9-1 is sleeved outside each positive electrode 9-2 and is used for isolating the positive electrode 9-2 from the inner surface of the bending male die 9 and ensuring that current flows only when the deformation is severe, and the positive electrode 9-2 and the insulating sleeve 9-1 are in interference fit; the front surface is simultaneously provided with three round holes with certain depth for connecting the positive pole of a binding post of an external power supply live wire 4-1; the front surface and the lower surface of the bending male die 9 are penetrated by two circular holes with certain depth, as shown in fig. 11; the periphery of the four discharging screws 14 is sleeved with four springs 13 for compressing and resetting.
Two metal pressing blocks 5 are arranged below the four discharging screws 14, and have the function of pressing edges of the workpiece to prevent the workpiece from warping in the deformation process; two threaded holes are formed in the thickness direction of each metal pressing block 5 and used for fixing the discharging screws 14; meanwhile, a round hole with a certain depth is arranged on the lower surface, which is in contact with a workpiece, in the thickness direction of the round hole and is used for placing negative electrodes 5-3, an insulating sleeve 5-2 is sleeved outside each negative electrode 5-3 and is used for isolating the negative electrode 5-3 from the inner surface of the metal pressing block 5 and ensuring that current flows when the metal pressing block deforms, and the negative electrode 5-3 and the insulating sleeve are in interference fit; a round hole with a certain depth connected with the negative pole of a binding post of an external power supply zero line 5-1 is arranged on the front surface of the metal pressing block 5; the front surface and the lower surface of the metal compact 5 are penetrated by two round holes with certain depth, as shown in fig. 7.
A bending female die 11, a female die fixing plate 6, a female die backing plate 7 and a striker plate 10 are arranged below the metal edge pressing block 5. The bending female die 11 is arranged in a step shape and is used for fastening with the female die fixing plate 6; two round holes with certain depth are arranged on the upper surface of the negative electrode 11-2, which is contacted with a workpiece, and are used for placing the negative electrodes 11-2, meanwhile, an insulating sleeve 11-1 is sleeved outside each negative electrode 11-2 and is used for isolating the negative electrode 11-2 from the inner surface of the bent concave die 11, so that current can only flow through the negative electrode 11-2 when the negative electrode is severely deformed, and the negative electrode 11-2 and the insulating sleeve 11-1 are in interference fit; the front surface is simultaneously provided with two round holes with certain depth for connecting the negative pole of a binding post of an external power supply zero line 6-1; the front surface of the bending die is penetrated by two circular holes with certain depth on the upper surface, as shown in fig. 13.
A step-shaped groove is formed in the center of the female die fixing plate 6 and used for fixing the bending female die 11; six threaded holes are formed in the periphery of the die base plate and used for fixing the die base plate 7 and the lower die base 8; two threaded holes are formed in the side surface of the die fixing plate 6 and used for fixing the striker plate 10, as shown in fig. 8. A female die backing plate 7 is arranged below the female die fixing plate 6 to prevent the lower die holder 8 from being damaged due to overlarge stress in the working process; the periphery of the die base plate 7 in the thickness direction is provided with six threaded holes which are used for fastening with the lower die holder 8 and the die fixing plate 6; two threaded holes are formed in the side surface, i.e., in the length direction, of the striker plate for fixing the striker plate 10, as shown in fig. 9. The striker plate 10 is provided with four through holes in the thickness direction and is used for fixing the striker plate with the female die base plate 7 and the female die fixing plate 6; the striker plate 10 functions to position and space the sheet as shown in fig. 12.
A lower die holder 8 is arranged below the striker plate 10 and the die backing plate 7, and six through holes corresponding to the die backing plate 7 and the die fixing plate 6 are formed in the thickness direction of the lower die holder 8 and are used for being connected with the die backing plate 7 and the die fixing plate 6, as shown in fig. 10. The lower die base 8 and the die backing plate 7 are fastened and connected through screws, the die fixing plate 6, the die backing plate 7 and the striker plate 10 are fastened and connected through screws, and two positioning pins are preferably arranged between the die backing plate 7 and the lower die base 8 for positioning.
The working process of the electric field assisted forming die of the ultrahigh-strength multi-channel bent part of the embodiment is approximately as follows:
the electric field auxiliary forming die for the ultrahigh-strength multi-channel bent part is initially in a die opening state and is arranged on a common press. The power live wire 4-1 of the positive electrode 9-2 of the external binding post and the power zero wires 5-1 and 6-1 of the negative electrodes 5-3 and 11-2 of the external binding post are in an open state.
Manually placing the blank on the female die fixing plate 6 until the blank is propped against the striker plate 10, and starting the press; the upper die holder 2 moves downwards along with the press, the die holder guide sleeve 15 slides axially along the die holder guide post 12, the negative electrode 5-3 of the metal edge pressing block 5 contacts with the blank before the blank, and no electric field is involved in the process. Along with the descending of the upper die, a positive electrode 9-2 in the bending male die 9 is in contact with the blank, at the moment, the blank enters a bending state, six sections of electric loops are formed, current flows through the sheet from the positive electrode 9-2, and finally flows out from two metal pressing blocks 5 and negative electrodes 5-3 and 11-2 of the bending female die 11. Until the bending male die 9 descends to the lowest point, and the obtained finished piece is a multi-channel bending piece with a blank holder. And after the bending is finished, the upper die is lifted back, and the workpiece is taken out manually. Thus completing the primary blanking and bending work.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
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