CN109590405B - Aluminum alloy battery box composite forming device - Google Patents

Aluminum alloy battery box composite forming device Download PDF

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Publication number
CN109590405B
CN109590405B CN201811466631.7A CN201811466631A CN109590405B CN 109590405 B CN109590405 B CN 109590405B CN 201811466631 A CN201811466631 A CN 201811466631A CN 109590405 B CN109590405 B CN 109590405B
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China
Prior art keywords
plate
cavity
forming
aluminum alloy
coil
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CN201811466631.7A
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Chinese (zh)
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CN109590405A (en
Inventor
徐俊瑞
张静
华摩西
王秦威
陈德山
宋慕清
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Xiangtan University
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Xiangtan University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00Making hollow objects
    • B21D51/16Making hollow objects characterised by the use of the objects
    • B21D51/52Making hollow objects characterised by the use of the objects boxes, cigarette cases, or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02Stamping using rigid devices or tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021Deforming sheet bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021Deforming sheet bodies
    • B21D26/027Means for controlling fluid parameters, e.g. pressure or temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021Deforming sheet bodies
    • B21D26/031Mould construction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/06Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/10Die sets; Pillar guides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/16Heating or cooling

Abstract

The utility model provides an aluminum alloy battery case composite forming device, belongs to metal material machine-shaping field, has solved current electric automobile battery case forming process and has leaded to the poor problem of forming piece quality easily. The forming device comprises: the supporting plate, the preforming female die and the pressing material are sequentially stacked on the forming female die from bottom to top, and the first through cavity, the preforming through cavity, the second through cavity and the forming cavity form a vertical communicating cavity. And the aluminum alloy plate to be formed is clamped between the pressure plate and the preforming female die. The electromagnetic pulse preforming unit is used for preforming the aluminum alloy plate in the preforming through cavity. The electro-plastic unit enables the preformed aluminum alloy plate to generate an electro-plastic effect. The stamping forming unit is used for carrying out secondary forming on the aluminum alloy plate generating the electro-plastic effect in the forming cavity. The electromagnetic pulse shape correcting unit is used for performing electromagnetic pulse shape forming on the fillet area of the secondarily formed aluminum alloy plate, so that the fillet area of the aluminum alloy plate is further attached to the fillet area of the forming cavity.

Description

Aluminum alloy battery box composite forming device
Technical Field
The invention relates to an aluminum alloy battery box forming device, and belongs to the field of metal material processing and forming.
Background
In recent years, with the increasing amount of automobiles, the problems of energy crisis and environmental pollution have become more prominent, and under such a large background, electric automobiles have been rapidly developed under the dual support of national new energy policies and markets. Compared with the traditional fuel oil automobile, the electric automobile has the advantages of low emission, low noise, simplicity in operation, convenience in maintenance and the like, has incomparable advantages in environmental protection and energy conservation, and is regarded as an effective way for solving human energy and environmental pressure.
At present, the main factor limiting the further development and popularization of electric vehicles is the low driving range of electric vehicles. Therefore, how to increase the endurance mileage of the electric vehicle has been a hot point of research in the field of electric vehicles, and is a difficult point of research. The existing means for improving the endurance mileage of the electric automobile mainly comprises the steps of improving the energy of a power battery, improving the efficiency of a transmission system and reducing the weight of the whole automobile. The whole vehicle weight is reduced, namely the electric vehicle is light, and the method is a main research direction for improving the endurance mileage of the electric vehicle in the field of the electric vehicle. According to related researches, the driving mileage of the electric automobile can be improved by 10-11% when the weight of the electric automobile is reduced by 100Kg, and meanwhile, the battery cost and the daily loss cost can be reduced by 20%. The existing means for reducing the weight of the electric automobile mainly comprise vehicle body weight reduction and battery weight reduction. Among these, the weight reduction of the battery mainly means the weight reduction of the battery case.
In order to achieve light weight of a battery case for an electric vehicle, an aluminum alloy material is generally used in the field of electric vehicles to manufacture the battery case, and the wall thickness of the battery case is made as small as possible. Therefore, the conventional forming process of the battery box of the electric automobile mainly comprises stamping. However, the battery box of the electric vehicle is a box-shaped member, which is a non-rotating body component, and the deformation of the non-rotating body component in the press forming process is more complicated than that of the rotating body component. When the battery case for electric vehicles is formed by drawing, the four rounded portions of the bottom correspond to drawing of the cylindrical member, and the straight wall portion corresponds to bending deformation. In terms of geometrical structure, the battery box of the electric automobile is an integral body, the deformation of the round corner part and the deformation of the straight wall part are not independent, but are correlated and influenced mutually, the deep drawing forming of the battery box of the electric automobile is the result under multi-factor coupling, and due to the structural characteristic that the hollow wall of the battery box of the electric automobile is thin, the failure of wrinkling, tensile fracture and other forms is easy to occur in the deep drawing forming process, so that the forming quality of the battery box of the electric automobile is seriously influenced. In order to solve this problem, some researchers have proposed an electromagnetic pulse assisted press forming process. The electromagnetic pulse auxiliary stamping forming process is to perform a part by adopting the existing stamping process and then locally form the key part of the part by adopting the electromagnetic pulse forming process. However, when the battery box of the electric vehicle is formed by using the electromagnetic pulse assisted stamping process, the junction between the straight wall and the round corner of the battery box and the junction between the bottom plate and the round corner are prone to serious thinning problems, and thus the local forming quality of the battery box of the electric vehicle is poor.
Disclosure of Invention
The invention provides an aluminum alloy battery box composite forming device, which aims to solve the problem that the quality of a formed part is poor due to the existing battery box forming process of an electric automobile.
The invention relates to an aluminum alloy battery box composite forming device which comprises a combined die unit, an electromagnetic pulse preforming unit, an electro-plastic unit, a stamping forming unit and an electromagnetic pulse shape correcting unit;
the combined die unit comprises a pressure plate 1, a preforming female die 2, a supporting plate 3 and a forming female die 4, wherein a first through cavity is formed in the pressure plate 1 from the top surface to the bottom surface of the pressure plate, a preforming through cavity is formed in the preforming female die 2 from the top surface to the bottom surface of the preforming female die, a second through cavity is formed in the supporting plate 3 from the top surface to the bottom surface of the supporting plate, and a forming cavity is concavely formed in the top surface of the forming female die 4;
the supporting plate 3, the preforming female die 2 and the pressure plate 1 are sequentially stacked on the forming female die 4 from bottom to top, the first through cavity, the preforming through cavity, the second through cavity and the forming cavity form a vertical communicating cavity, and a plurality of convex balls 5 are uniformly arranged on the boundary of the cavity wall of the preforming through cavity and the cavity wall of the second through cavity;
the aluminum alloy plate 6 to be formed is clamped between the pressure plate 1 and the preforming female die 2;
the electromagnetic pulse preforming unit is used for performing electromagnetic pulse forming on the aluminum alloy plate 6 so as to perform the aluminum alloy plate 6 in the preforming through cavity;
the electro-plasticity unit is used for enabling the preformed aluminum alloy plate 6 to generate an electro-plasticity effect;
the stamping forming unit is used for stamping and forming the aluminum alloy plate 6 with the electro-plastic effect to ensure that the aluminum alloy plate 6 is attached to the forming cavity so as to realize secondary forming of the aluminum alloy plate 6;
the electromagnetic pulse shape correcting unit is used for performing electromagnetic pulse forming on the fillet area of the secondarily formed aluminum alloy plate 6, so that the fillet area of the aluminum alloy plate 6 is further attached to the fillet area of the forming cavity.
Preferably, the combined die unit further comprises an upper die seat plate 7, an upper die cushion plate 8, a lower die cushion plate 9 and a lower die seat plate 10;
a third through cavity is arranged in the upper die base plate 7 from the top surface to the bottom surface, a fourth through cavity is arranged in the upper die backing plate 8 from the top surface to the bottom surface, the upper die backing plate 8 and the upper die base plate 7 are sequentially stacked on the pressure plate 1 from bottom to top, the third through cavity and the fourth through cavity are communicated with the first through cavity, and the lower die backing plate 9 and the forming female die 4 are sequentially stacked on the lower die base plate 10 from bottom to top;
the upper die seat plate 7, the upper die base plate 8 and the material pressing plate 1 are fixedly arranged through inner hexagon screws, and the lower die seat plate 10, the lower die base plate 9, the forming female die 4, the supporting plate 3 and the preforming female die 2 are fixedly arranged through inner hexagon screws;
the bottom surface of the upper die base plate 7 is provided with a first guide pillar 11, a second guide pillar, a third guide pillar and a fourth guide pillar 12, the top surface of the lower die base plate 10 is provided with a first guide sleeve 13, a second guide sleeve, a third guide sleeve and a fourth guide sleeve 14, and the first guide pillar 11-the fourth guide pillar 12 are respectively matched with the first guide sleeve 13-the fourth guide sleeve 14 to jointly realize the positioning of the upper die base plate 7 and the lower die base plate 10.
Preferably, the electromagnetic pulse preforming unit includes a first high voltage pulse generating subunit, a preforming coil 15 and a coil holder 16;
the preformed coil 15 is coaxially embedded on the coil seat frame 16, a coil seat frame slideway is arranged in the pressure plate 1 from one side wall of the pressure plate to the first through cavity, the coil seat frame 16 can enter the first through cavity through the coil seat frame slideway, and the coil seat frame 16 is occluded with the pressure plate 1;
when the coil mount 16 is positioned in the first through cavity, the preformed coil 15 is attached to the aluminum alloy sheet 6;
the first high voltage pulse generating subunit forms an electrical circuit with the preformed coil 15.
Preferably, the electro-plastic cell comprises a high energy pulsed power supply 17, a first electrode 18 and a second electrode 19;
the lower end of the first electrode 18 and the lower end of the second electrode 19 are connected with the light alloy sheet material 6 after sequentially and vertically penetrating through the upper die base plate 7, the upper die base plate 8 and the material pressing plate 1;
the upper end of the first electrode 18 and the upper end of the second electrode 19 are connected to the positive electrode and the negative electrode of the high-energy pulse power supply 17, respectively.
Preferably, a first insulating sleeve 20 and a second insulating sleeve 21 are closely fitted over the first electrode 18 and the second electrode 19, respectively.
Preferably, the press-forming unit includes a press and a forming punch 22;
after the aluminum alloy plate 6 is preformed, the preformed coil 15 and the coil seat frame 16 are moved out of the pressure plate 1 through the coil seat frame slide way;
under the pushing of the press, the forming male die 22 sequentially passes through the third through cavity, the fourth through cavity, the first through cavity and the preforming through cavity, and carries out stamping forming on the aluminum alloy plate 6 with the electro-plastic effect.
Preferably, the electromagnetic pulse reshaping unit comprises an insulator 23, an insulator pressing plate 24, a reshaping coil winding rod 25, a reshaping coil 26 and a second high-voltage pulse generating subunit;
the upper end of the insulator 23 is embedded in the insulator pressing plate 24, the upper end of the orthopedic coil winding rod 25 is flush with the top surface of the insulator pressing plate 24, and the lower end of the orthopedic coil winding rod 25 sequentially penetrates through the insulator pressing plate 24 and the insulator 23 and exceeds the insulator 23;
the orthopedic coil winding rod 25 is coaxially arranged with the insulator 23, and the orthopedic coil 26 is wound along the lower end of the orthopedic coil winding rod 25;
after the aluminum alloy plate 6 is formed for the second time, the forming male die 22 is driven by the press machine to move out of the combined die unit;
the orthopedic coil 26 is arranged in the secondary formed aluminum alloy plate 6 and is tightly attached to the fillet area of the aluminum alloy plate 6 under the pressure from the insulator pressing plate 24 and the insulator 23;
the second high-voltage pulse generating subunit forms an electrical circuit with the orthopaedic coil 26.
Preferably, the first high-voltage pulse generating subunit and the second high-voltage pulse generating subunit have the same circuit structure;
each high-voltage pulse generation subunit comprises a high-voltage transformer, a rectifier, a charging resistor, a switch, a discharge capacitor and an auxiliary discharge gap;
the two ends of a primary coil of the high-voltage transformer are respectively connected with the two ends of an alternating-current voltage source, a first end of a secondary coil of the high-voltage transformer is connected with a first end of a switch sequentially through a rectifier and a charging resistor, a second end of the switch is simultaneously connected with a first end of a discharge capacitor and a first end of an auxiliary discharge gap, and the second end of the secondary coil of the high-voltage transformer and the second end of the discharge capacitor are both connected with a power supply ground;
and the second end of the auxiliary discharge gap, the second end of the secondary coil of the high-voltage transformer and the common end of the second end of the discharge capacitor are two access ends of the corresponding coil respectively.
Preferably, the aluminum alloy battery case composite forming device further comprises a temperature measuring unit;
the temperature measuring unit is used for measuring the temperature of the aluminum alloy plate 6 in real time in the process that the aluminum alloy plate 6 generates the electro-plastic effect, and is also used for forming a plate temperature closed-loop control system with the high-energy pulse power supply 17 so as to realize real-time control of the temperature of the aluminum alloy plate.
Preferably, the aluminum alloy battery case composite forming device further comprises a forming member ejecting unit, and the combined mold unit further comprises a supporting plate 27;
the supporting plate 27 is fixedly arranged between the lower die base plate 9 and the lower die seat plate 10, a fifth through cavity is vertically arranged in the supporting plate 27 from the top surface to the bottom surface of the supporting plate, a sixth through cavity is vertically arranged in the lower die seat plate 10 from the top surface to the bottom surface of the supporting plate, and the fifth through cavity is vertically opposite to the sixth through cavity;
the forming part ejection unit comprises a push plate 28, a push rod fixing plate 29 and a push rod 30, the push plate 28 and the push rod fixing plate 29 are fixedly arranged and are both positioned in the fifth through cavity, and the push plate 28 and the push rod fixing plate 29 are sequentially stacked on the lower die base plate 10 from bottom to top and cover the upper end of the sixth through cavity;
the lower end of the push rod 30 is arranged in the push rod fixing plate 29, and the upper end of the push rod 30 is flush with the bottom surface of the forming cavity after sequentially vertically penetrating through the lower die base plate 9 and the forming female die 4;
a fifth straight guide post 31, a sixth straight guide post, a seventh straight guide post and an eighth straight guide post 32 are arranged on the lower die base plate 10, and the upper ends of the fifth straight guide post 31 to the eighth straight guide post 32 are connected with the lower die base plate 9 after sequentially penetrating through the push plate 28 and the push rod fixing plate 29;
the push plate 28 can move horizontally in the fifth through cavity through the fifth straight guide post 31-the eighth straight guide post 32.
The forming process of the aluminum alloy battery box composite forming device for the aluminum alloy plate comprises four stages of preforming, electro-plasticity, secondary forming and shape correction.
According to the invention, the electromagnetic pulse preforming unit applies electromagnetic force to the aluminum alloy plate to perform the aluminum alloy plate, and in the process of preforming the aluminum alloy plate, the joule heat generated by the induced eddy current of the aluminum alloy plate heats the aluminum alloy plate, so that the aluminum alloy plate is dynamically restored in the deformation process to improve the plasticity of the aluminum alloy plate. On the other hand, under the condition of high strain rate, dislocation of the aluminum alloy plate is characterized by multi-line slippage, the dislocation density is large, the configuration is uniform, and the dislocation homogenization degree is improved along with the improvement of the strain rate, so that the aluminum alloy plate shows better plasticity.
According to the invention, the electro-plasticity unit enables the aluminum alloy plate to generate the electro-plasticity effect, so that the plasticity of the aluminum alloy plate is greatly improved, the problem that the strength of the aluminum alloy plate formed at high temperature is reduced due to coarse grains is avoided to the greatest extent, and the quality of a formed part is effectively ensured. Meanwhile, in the process that the aluminum alloy plate generates the electro-plastic effect, the aluminum alloy plate is rapidly heated, so that the phenomenon that orange peel tissues are generated on the surface of the aluminum alloy plate due to the fact that the aluminum alloy plate is heated is reduced to a great extent, and the quality of a formed piece is further guaranteed.
The secondary forming of the aluminum alloy plate is realized through the stamping forming unit. In the secondary forming process, the ball ring formed by a plurality of balls arranged on the boundary of the cavity wall of the preformed through cavity and the cavity wall of the second through cavity can improve the smoothness degree of the straight wall part of the forming piece to a certain degree, and further improve the quality of the forming piece.
According to the invention, the electromagnetic pulse shape righting unit applies electromagnetic force to the fillet area of the aluminum alloy plate, so that the fillet area is further subjected to mould pasting forming, and the local shape righting of the aluminum alloy plate is realized. In addition, the electromagnetic pulse shape correcting unit discharges electricity for multiple times in the fillet area of the aluminum alloy plate, so that the stress distribution in the fillet area can be improved, and the deformation of the fillet area is more uniform.
Compared with the existing battery box forming process of the electric automobile based on stamping, the composite forming process of electromagnetic pulse high-speed driving, quasi-static state warm pultrusion and electromagnetic pulse shape righting, which is realized by the electromagnetic pulse preforming unit, the electro-plastic unit, the stamping forming unit and the electromagnetic pulse shape righting unit, thoroughly solves the problems of the rupture of a formed part caused by local strain energy or overlarge forming energy and the corrugation of the formed part caused by insufficient or inappropriate forming energy, and can effectively solve the quality of the formed part of the battery box.
Compared with the existing electric automobile battery box forming process based on electromagnetic pulse auxiliary stamping, the electromagnetic pulse high-speed driving-quasi-static warm pultrusion-electromagnetic pulse shape correcting composite forming process provided by the invention not only applies the electromagnetic pulse high-speed forming technology for two times, but also applies the electro-plastic effect and the quasi-static pultrusion process, has the advantages of improving the plate forming performance, improving the plate stress distribution, inhibiting wrinkling, effectively controlling resilience, reducing distortion deformation, locally finely forming, avoiding lubricating oil and the like, and can effectively inhibit the thinning problem occurring at the joint of a straight wall and a fillet of a battery box and the joint of a bottom plate and the fillet.
Drawings
Hereinafter, the aluminum alloy battery case composite forming apparatus of the present invention will be described in more detail based on examples with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of an aluminum alloy battery case composite forming apparatus according to an embodiment;
FIG. 2 is a schematic structural diagram of an electromagnetic pulse straightening unit according to an embodiment;
FIG. 3 is a schematic circuit diagram of an electromagnetic pulse pre-shaping unit according to an exemplary embodiment;
FIG. 4 is a front view of the upper die plate according to the embodiment;
FIG. 5 is a top view of the upper die plate according to the embodiment;
FIG. 6 is a front view of the upper shim plate of the example;
FIG. 7 is a top view of the upper shim plate of the example;
fig. 8 is a front view of the nip plate mentioned in the examples;
FIG. 9 is a top view of the nip plate of the examples;
FIG. 10 is a front view of the coil mount of the embodiment mentioned;
FIG. 11 is a top view of a coil mount of the type mentioned in the examples;
FIG. 12 is a front view of the preform female mold mentioned in the examples;
FIG. 13 is a top view of the preform matrix according to the example;
FIG. 14 is a front view of the pallet of the embodiment;
FIG. 15 is a top view of the pallet of the embodiment;
FIG. 16 is a front view of the support plate according to the embodiment;
FIG. 17 is a top view of the support plate according to the embodiment;
FIG. 18 is a front view of the lower die base plate according to the embodiment;
FIG. 19 is a plan view of the lower die base plate according to the embodiment.
Detailed Description
The aluminum alloy battery case composite forming apparatus according to the present invention will be further described with reference to the accompanying drawings.
Example (b): the present embodiment will be described in detail with reference to fig. 1 to 19.
The aluminum alloy battery box composite forming device comprises a combined die unit, an electromagnetic pulse preforming unit, an electro-plastic unit, a stamping forming unit and an electromagnetic pulse shape correcting unit;
the combined die unit comprises a pressure plate 1, a preforming female die 2, a supporting plate 3 and a forming female die 4, wherein a first through cavity is formed in the pressure plate 1 from the top surface to the bottom surface of the pressure plate, a preforming through cavity is formed in the preforming female die 2 from the top surface to the bottom surface of the preforming female die, a second through cavity is formed in the supporting plate 3 from the top surface to the bottom surface of the supporting plate, and a forming cavity is concavely formed in the top surface of the forming female die 4;
the supporting plate 3, the preforming female die 2 and the pressure plate 1 are sequentially stacked on the forming female die 4 from bottom to top, the first through cavity, the preforming through cavity, the second through cavity and the forming cavity form a vertical communicating cavity, and a plurality of convex balls 5 are uniformly arranged on the boundary of the cavity wall of the preforming through cavity and the cavity wall of the second through cavity;
the aluminum alloy plate 6 to be formed is clamped between the pressure plate 1 and the preforming female die 2;
the electromagnetic pulse preforming unit is used for performing electromagnetic pulse forming on the aluminum alloy plate 6 so as to perform the aluminum alloy plate 6 in the preforming through cavity;
the electro-plasticity unit is used for enabling the preformed aluminum alloy plate 6 to generate an electro-plasticity effect;
the stamping forming unit is used for stamping and forming the aluminum alloy plate 6 with the electro-plastic effect to ensure that the aluminum alloy plate 6 is attached to the forming cavity so as to realize secondary forming of the aluminum alloy plate 6;
the electromagnetic pulse shape correcting unit is used for performing electromagnetic pulse forming on the fillet area of the secondarily formed aluminum alloy plate 6, so that the fillet area of the aluminum alloy plate 6 is further attached to the fillet area of the forming cavity.
The combined die unit of the embodiment also comprises an upper die seat plate 7, an upper die base plate 8, a lower die base plate 9 and a lower die seat plate 10;
a third through cavity is arranged in the upper die base plate 7 from the top surface to the bottom surface, a fourth through cavity is arranged in the upper die backing plate 8 from the top surface to the bottom surface, the upper die backing plate 8 and the upper die base plate 7 are sequentially stacked on the pressure plate 1 from bottom to top, the third through cavity and the fourth through cavity are communicated with the first through cavity, and the lower die backing plate 9 and the forming female die 4 are sequentially stacked on the lower die base plate 10 from bottom to top;
the upper die seat plate 7, the upper die base plate 8 and the material pressing plate 1 are fixedly arranged through inner hexagon screws, and the lower die seat plate 10, the lower die base plate 9, the forming female die 4, the supporting plate 3 and the preforming female die 2 are fixedly arranged through inner hexagon screws;
the bottom surface of the upper die base plate 7 is provided with a first guide pillar 11, a second guide pillar, a third guide pillar and a fourth guide pillar 12, the top surface of the lower die base plate 10 is provided with a first guide sleeve 13, a second guide sleeve, a third guide sleeve and a fourth guide sleeve 14, and the first guide pillar 11-the fourth guide pillar 12 are respectively matched with the first guide sleeve 13-the fourth guide sleeve 14 to jointly realize the positioning of the upper die base plate 7 and the lower die base plate 10.
The electromagnetic pulse preforming unit of the present embodiment includes a first high-voltage pulse generating subunit, a preforming coil 15, and a coil holder 16;
the preformed coil 15 is coaxially embedded on the coil seat frame 16, a coil seat frame slideway is arranged in the pressure plate 1 from one side wall of the pressure plate to the first through cavity, the coil seat frame 16 can enter the first through cavity through the coil seat frame slideway, and the coil seat frame 16 is occluded with the pressure plate 1;
when the coil mount 16 is positioned in the first through cavity, the preformed coil 15 is attached to the aluminum alloy sheet 6;
the first high voltage pulse generating subunit forms an electrical circuit with the preformed coil 15.
In this embodiment, a coil holder ejector slide way is provided in the pressure plate 1 from the other side wall thereof to the first through cavity, the one side wall of the pressure plate 1 is opposite to the other side wall, when the aluminum alloy plate 6 is preformed, the front end of the coil holder ejector enters the pressure plate 1 through the coil holder ejector slide way, and a horizontal external thrust is applied to the coil holder 16, so that the preformed coil 15 together with the coil holder 16 is moved out of the pressure plate 1 through the coil holder slide way.
The electro-plastic unit of the present embodiment includes a high-energy pulse power supply 17, a first electrode 18, and a second electrode 19;
the lower end of the first electrode 18 and the lower end of the second electrode 19 are connected with the light alloy sheet material 6 after sequentially and vertically penetrating through the upper die base plate 7, the upper die base plate 8 and the material pressing plate 1;
the upper end of the first electrode 18 and the upper end of the second electrode 19 are respectively connected with the anode and the cathode of the high-energy pulse power supply 17;
a first insulating sleeve 20 and a second insulating sleeve 21 are respectively tightly sleeved on the first electrode 18 and the second electrode 19.
The high-energy pulse power supply 17, the first electrode 18, the second electrode 19 and the aluminum alloy plate 6 of the present embodiment form an electrical circuit. The pulse current flowing through the aluminum alloy sheet 6 causes the aluminum alloy sheet 6 to be heated in an extremely short time. On the other hand, the electronic wind power generated by the pulse current in the aluminum alloy plate 6 has the effect of promoting movement of dislocation, so that the microstructure and the mechanical property of the aluminum alloy plate 6 can be improved, and the plasticity of the aluminum alloy plate 6 is obviously improved.
The press-forming unit of the present embodiment includes a press and a forming punch 22;
after the aluminum alloy plate 6 is preformed, the preformed coil 15 and the coil seat frame 16 are moved out of the pressure plate 1 through the coil seat frame slide way;
under the pushing of the press, the forming male die 22 sequentially passes through the third through cavity, the fourth through cavity, the first through cavity and the preforming through cavity, and carries out stamping forming on the aluminum alloy plate 6 with the electro-plastic effect.
The electromagnetic pulse reshaping unit of the present embodiment comprises an insulator 23, an insulator pressing plate 24, a reshaping coil winding rod 25, a reshaping coil 26 and a second high-voltage pulse generating subunit;
the upper end of the insulator 23 is embedded in the insulator pressing plate 24, the upper end of the orthopedic coil winding rod 25 is flush with the top surface of the insulator pressing plate 24, and the lower end of the orthopedic coil winding rod 25 sequentially penetrates through the insulator pressing plate 24 and the insulator 23 and exceeds the insulator 23;
the orthopedic coil winding rod 25 is coaxially arranged with the insulator 23, and the orthopedic coil 26 is wound along the lower end of the orthopedic coil winding rod 25;
after the aluminum alloy plate 6 is formed for the second time, the forming male die 22 is driven by the press machine to move out of the combined die unit;
the orthopedic coil 26 is arranged in the secondary formed aluminum alloy plate 6 and is tightly attached to the fillet area of the aluminum alloy plate 6 under the pressure from the insulator pressing plate 24 and the insulator 23;
the second high-voltage pulse generating subunit forms an electrical circuit with the orthopaedic coil 26.
In this embodiment, as the discharge voltage of the second high-voltage pulse generation subunit is increased, the electromagnetic pulse forming can improve the re-deformability of the fillet area, so that the fillet area is further formed by die bonding. The increase of the discharge times of the electromagnetic pulse shape correcting unit is beneficial to further deformation of the fillet area, and the stress distribution can be improved through multiple discharge, so that the deformation of the fillet area is more uniform. In the process of discharging the fillet area, the rebound behavior of the material can be controlled under the combined action of the magnetic field force and the combined die unit, and the rebound is effectively controlled.
In this embodiment, the first high-voltage pulse generation subunit and the second high-voltage pulse generation subunit have the same circuit structure;
the first high-voltage pulse generation subunit comprises a high-voltage transformer T, a rectifier UF, a charging resistor R, a switch S, a discharge capacitor C and an auxiliary discharge gap F;
two ends of a primary coil of a high-voltage transformer T are respectively connected with two ends of an alternating-current voltage source AC, a first end of a secondary coil of the high-voltage transformer T is connected with a first end of a switch S sequentially through a rectifier UF and a charging resistor R, a second end of the switch S is connected with a first end of a discharge capacitor C and a first end of an auxiliary discharge gap F at the same time, a second end of the auxiliary discharge gap F is connected with a first end of a preformed coil 15, and a second end of the preformed coil 15, a second end of the discharge capacitor C and a second end of the secondary coil of the high-voltage transformer T are all connected with a power ground;
for the second high-voltage pulse generating subunit, the second end of the auxiliary discharge gap and the common end of the second end of the secondary winding of the high-voltage transformer and the second end of the discharge capacitor are two access ends of the shaping winding 26 respectively.
The aluminum alloy battery box composite forming device further comprises a temperature measuring unit;
the temperature measuring unit is used for measuring the temperature of the aluminum alloy plate 6 in real time in the process that the aluminum alloy plate 6 generates the electro-plastic effect, and is also used for forming a plate temperature closed-loop control system with the high-energy pulse power supply 17 so as to realize real-time control of the temperature of the aluminum alloy plate.
The temperature measuring unit of the present embodiment indirectly measures the temperature of the aluminum alloy sheet 6 by the thermocouple 33 built in the preform die 2. The thermocouple 33 is adjacent to the top surface of the preform die 2.
The aluminum alloy battery box composite forming device further comprises a forming part ejection unit, and the combined type die unit further comprises a supporting plate 27;
the supporting plate 27 is fixedly arranged between the lower die base plate 9 and the lower die seat plate 10, a fifth through cavity is vertically arranged in the supporting plate 27 from the top surface to the bottom surface of the supporting plate, a sixth through cavity is vertically arranged in the lower die seat plate 10 from the top surface to the bottom surface of the supporting plate, and the fifth through cavity is vertically opposite to the sixth through cavity;
the forming part ejection unit comprises a push plate 28, a push rod fixing plate 29 and a push rod 30, the push plate 28 and the push rod fixing plate 29 are fixedly arranged and are both positioned in the fifth through cavity, and the push plate 28 and the push rod fixing plate 29 are sequentially stacked on the lower die base plate 10 from bottom to top and cover the upper end of the sixth through cavity;
the lower end of the push rod 30 is arranged in the push rod fixing plate 29, and the upper end of the push rod 30 is flush with the bottom surface of the forming cavity after sequentially vertically penetrating through the lower die base plate 9 and the forming female die 4;
a fifth straight guide post 31, a sixth straight guide post, a seventh straight guide post and an eighth straight guide post 32 are arranged on the lower die base plate 10, and the upper ends of the fifth straight guide post 31 to the eighth straight guide post 32 are connected with the lower die base plate 9 after sequentially penetrating through the push plate 28 and the push rod fixing plate 29;
the push plate 28 can move horizontally in the fifth through cavity through the fifth straight guide post 31-the eighth straight guide post 32.
The aluminum alloy battery box composite forming device realizes effective combination of an electromagnetic pulse forming process and a quasi-static pultrusion forming process by designing a die structure embedded with a coil, can complete dynamic-quasi-static composite processing of parts in one working stroke of a press, shortens the forming period of the parts, improves the production efficiency and reduces the production cost.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (10)

1. The aluminum alloy battery box composite forming device is characterized by comprising a combined die unit, an electromagnetic pulse preforming unit, an electro-plastic unit, a stamping forming unit and an electromagnetic pulse shape correcting unit;
the combined die unit comprises a pressure plate (1), a preforming female die (2), a supporting plate (3) and a forming female die (4), wherein a first through cavity is formed in the pressure plate (1) from the top surface to the bottom surface of the pressure plate, a preforming through cavity is formed in the preforming female die (2) from the top surface to the bottom surface of the preforming female die, a second through cavity is formed in the supporting plate (3) from the top surface to the bottom surface of the supporting plate, and a forming cavity is concavely formed in the top surface of the forming female die (4);
the supporting plate (3), the preformed female die (2) and the pressure plate (1) are sequentially stacked on the forming female die (4) from bottom to top, the first through cavity, the preformed through cavity, the second through cavity and the forming cavity form a vertical communicating cavity, and a plurality of convex balls (5) are uniformly arranged on a boundary of the cavity wall of the preformed through cavity and the cavity wall of the second through cavity;
an aluminum alloy plate (6) to be formed is clamped between the pressure plate (1) and the pre-forming female die (2);
the electromagnetic pulse pre-forming unit is used for performing electromagnetic pulse forming on the aluminum alloy plate (6) so as to pre-form the aluminum alloy plate (6) in the pre-forming through cavity;
the electro-plasticity unit is used for enabling the preformed aluminum alloy plate (6) to generate an electro-plasticity effect;
the stamping forming unit is used for stamping and forming the aluminum alloy plate (6) with the electro-plastic effect to ensure that the aluminum alloy plate (6) is attached to the forming cavity so as to realize secondary forming of the aluminum alloy plate (6);
the electromagnetic pulse shape righting unit is used for performing electromagnetic pulse shaping on the fillet area of the secondary-shaped aluminum alloy plate (6), so that the fillet area of the aluminum alloy plate (6) is further attached to the fillet area of the shaping cavity.
2. The aluminum alloy battery case composite forming device of claim 1, wherein the modular mold unit further comprises an upper mold base plate (7), an upper mold backing plate (8), a lower mold backing plate (9), and a lower mold base plate (10);
a third through cavity is formed in the upper die base plate (7) from the top surface to the bottom surface of the upper die base plate, a fourth through cavity is formed in the upper die base plate (8) from the top surface to the bottom surface of the upper die base plate, the upper die base plate (8) and the upper die base plate (7) are sequentially stacked on the pressure plate (1) from bottom to top, the third through cavity and the fourth through cavity are communicated with the first through cavity, and the lower die base plate (9) and the forming female die (4) are sequentially stacked on the lower die base plate (10) from bottom to top;
the upper die seat plate (7), the upper die base plate (8) and the pressure plate (1) are fixedly arranged through inner hexagon screws, and the lower die seat plate (10), the lower die base plate (9), the forming female die (4), the supporting plate (3) and the preforming female die (2) are fixedly arranged through inner hexagon screws;
the bottom surface of the upper die base plate (7) is provided with a first guide pillar (11), a second guide pillar, a third guide pillar and a fourth guide pillar (12), the top surface of the lower die base plate (10) is provided with a first guide sleeve (13), a second guide sleeve, a third guide sleeve and a fourth guide sleeve (14), and the first guide pillar (11) to the fourth guide pillar (12) are respectively matched with the first guide sleeve (13) to the fourth guide sleeve (14) to jointly realize the positioning of the upper die base plate (7) and the lower die base plate (10).
3. The aluminum alloy battery case composite forming device according to claim 2, wherein the electromagnetic pulse preforming unit comprises a first high voltage pulse generating subunit, a preforming coil (15) and a coil holder (16);
the preformed coil (15) is coaxially embedded on the coil seat frame (16), a coil seat frame slideway is arranged in the pressure plate (1) from one side wall of the pressure plate to the first through cavity, the coil seat frame (16) can enter the first through cavity through the coil seat frame slideway, and the coil seat frame (16) is meshed with the pressure plate (1);
when the coil seat frame (16) is positioned in the first through cavity, the preformed coil (15) is attached to the aluminum alloy plate (6);
the first high voltage pulse generating subunit and the preformed coil (15) form an electrical circuit.
4. A composite forming device for an aluminum alloy battery case according to claim 3, wherein the electro-plastic unit comprises a high energy pulse power source (17), a first electrode (18) and a second electrode (19);
the lower end of the first electrode (18) and the lower end of the second electrode (19) are connected with the aluminum alloy plate (6) after vertically penetrating through the upper die base plate (7), the upper die base plate (8) and the material pressing plate (1) in sequence;
the upper end of the first electrode (18) and the upper end of the second electrode (19) are respectively connected with the anode and the cathode of the high-energy pulse power supply (17).
5. A composite forming device for an aluminum alloy battery case according to claim 4, wherein a first insulating bush (20) and a second insulating bush (21) are tightly fitted over the first electrode (18) and the second electrode (19), respectively.
6. The aluminum alloy battery case composite forming device according to claim 5, wherein the press forming unit comprises a press and a forming punch (22);
after the aluminum alloy plate (6) is preformed, the preformed coil (15) and the coil seat frame (16) are moved out of the pressure plate (1) through the coil seat frame slide way;
under the pushing of the press machine, the forming male die (22) sequentially passes through the third through cavity, the fourth through cavity, the first through cavity and the preforming through cavity, and carries out stamping forming on the aluminum alloy plate (6) with the electro-plastic effect.
7. The aluminum alloy battery box composite forming device according to claim 6, wherein the electromagnetic pulse shape righting unit comprises an insulator (23), an insulator pressing plate (24), a shape righting coil winding rod (25), a shape righting coil (26) and a second high voltage pulse generating subunit;
the upper end of the insulator (23) is embedded in the insulator pressing plate (24), the upper end of the orthopedic coil winding rod (25) is flush with the top surface of the insulator pressing plate (24), and the lower end of the orthopedic coil winding rod (25) sequentially penetrates through the insulator pressing plate (24) and the insulator (23) and exceeds the insulator (23);
the orthopedic coil winding rod (25) and the insulator (23) are coaxially arranged, and the orthopedic coil (26) is wound along the lower end of the orthopedic coil winding rod (25);
after the aluminum alloy plate (6) is formed for the second time, the forming male die (22) is driven by the press machine to move out of the combined die unit;
the orthopedic coil (26) is arranged in the secondary formed aluminum alloy plate (6) and is tightly attached to the fillet area of the aluminum alloy plate (6) under the pressure from the insulator pressing plate (24) and the insulator (23);
the second high-voltage pulse generating subunit and the orthopedic coil (26) form an electric circuit.
8. A composite forming apparatus for an aluminum alloy battery case according to claim 7, wherein the first high voltage pulse generating subunit and the second high voltage pulse generating subunit have the same circuit configuration;
each high-voltage pulse generation subunit comprises a high-voltage transformer, a rectifier, a charging resistor, a switch, a discharge capacitor and an auxiliary discharge gap;
the two ends of a primary coil of the high-voltage transformer are respectively connected with the two ends of an alternating-current voltage source, a first end of a secondary coil of the high-voltage transformer is connected with a first end of a switch sequentially through a rectifier and a charging resistor, a second end of the switch is simultaneously connected with a first end of a discharge capacitor and a first end of an auxiliary discharge gap, and the second end of the secondary coil of the high-voltage transformer and the second end of the discharge capacitor are both connected with a power supply ground;
and the second end of the auxiliary discharge gap, the second end of the secondary coil of the high-voltage transformer and the common end of the second end of the discharge capacitor are two access ends of the corresponding coil respectively.
9. A composite forming apparatus for an aluminum alloy battery case according to claim 8, wherein said composite forming apparatus for an aluminum alloy battery case further comprises a temperature measuring unit;
the temperature measuring unit is used for measuring the temperature of the aluminum alloy plate (6) in real time in the process that the aluminum alloy plate (6) generates the electro-plastic effect, and is also used for forming a plate temperature closed-loop control system with the high-energy pulse power supply (17) so as to realize real-time control of the temperature of the aluminum alloy plate.
10. The aluminum alloy battery case composite forming device according to claim 9, wherein the aluminum alloy battery case composite forming device further comprises a formed piece ejecting unit, the split mold unit further comprises a support plate (27);
the supporting plate (27) is fixedly arranged between the lower die base plate (9) and the lower die seat plate (10), a fifth through cavity is vertically arranged in the supporting plate (27) from the top surface to the bottom surface of the supporting plate, a sixth through cavity is vertically arranged in the lower die seat plate (10) from the top surface to the bottom surface of the supporting plate, and the fifth through cavity is vertically opposite to the sixth through cavity;
the forming part ejection unit comprises a push plate (28), a push rod fixing plate (29) and a push rod (30), the push plate (28) and the push rod fixing plate (29) are fixedly arranged and are located in the fifth through cavity, and the push plate (28) and the push rod fixing plate (29) are sequentially stacked on the lower die base plate (10) from bottom to top and cover the upper end of the sixth through cavity;
the lower end of the push rod (30) is arranged in the push rod fixing plate (29), and the upper end of the push rod (30) is flush with the bottom surface of the forming cavity after sequentially and vertically penetrating through the lower die base plate (9) and the forming female die (4);
a fifth straight guide post (31), a sixth straight guide post, a seventh straight guide post and an eighth straight guide post (32) are arranged on the lower die base plate (10), and the upper ends of the fifth straight guide post (31) to the eighth straight guide post (32) are connected with the lower die base plate (9) after sequentially penetrating through the push plate (28) and the push rod fixing plate (29);
the push plate (28) can translate in the fifth through cavity through a fifth straight guide post (31) to an eighth straight guide post (32).
CN201811466631.7A 2018-12-03 2018-12-03 Aluminum alloy battery box composite forming device Active CN109590405B (en)

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DE102020101088A1 (en) * 2020-01-17 2021-07-22 Volkswagen Aktiengesellschaft Process for forming metal composite foils for battery cells
CN111570510A (en) * 2020-05-09 2020-08-25 内蒙古工业大学 Plate rolling device and method based on magnetic pulse impact modification
CN112642930A (en) * 2020-12-11 2021-04-13 武汉理工大学 Electromagnetic composite forming method for oblique flange box-shaped part

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