Lightweight high-strength aluminum alloy blade battery shell extrusion forming device

Abstract

The application discloses a light-weight high-strength aluminum alloy blade battery shell extrusion forming device, and belongs to the technical field of punch forming, which comprises a machine base, a punch base, a male die unit and a female die unit, four symmetrical support columns are vertically fixed to the upper end surface of the machine base, and the punch base is fixed to the upper end of the four support columns; a movable template is slidably installed below the punch base on the support columns, the male die unit is fixed below the movable template, and the female die unit is installed on the upper end surface of the machine base and directly below the male die unit; a plurality of die plates can cooperate to form a deformable adjustable forming cavity in the application, which can realize the shrinkage of the forming cavity under the drive of the soft pressing mechanism, so that the battery shell is gradually extruded and shaped, the edge seam of the battery shell can be accurately spliced, the size difference of the spliced seams of the battery shell caused by direct punching is avoided, the light-weight high-strength aluminum alloy material battery shell can be adapted, and the adaptability to the high-strength aluminum alloy material is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of punch forming, and particularly relates to a light-weight high-strength aluminum alloy blade battery shell extrusion forming device. BACKGROUND

[0002] Aluminum alloy has good high-temperature corrosion resistance and excellent heat transfer and electrical conductivity, which makes aluminum alloy an ideal choice for new energy automobile battery shells; at present, the extrusion forming of the aluminum alloy blade battery shell usually includes the steps of blank preparation, heating, extrusion, cooling and subsequent processing; and the traditional punch forming equipment adopts one-time strong punching for the aluminum alloy battery shell, which can achieve the production purpose of rapid forming, but the aluminum alloy battery shell is uniformly extruded under instantaneous high pressure, and especially the material in the joint area is difficult to realize precise alignment and close combination, which easily leads to problems such as different sizes of gaps, misalignment and loose combination at the joint of the battery shell, seriously affecting the sealing performance and structural strength; and especially micro-cracks, wrinkles and even fractures are generated at the bending part, and the yield rate is low. SUMMARY

[0003] To achieve the above-mentioned purpose, the application provides the following technical scheme: a light-weight high-strength aluminum alloy blade battery shell extrusion forming device, which comprises a machine base, a punch base, a male die unit and a female die unit, the upper end surface of the machine base is vertically fixed with four symmetrically distributed support columns, the punch base is fixed at the upper end of the four support columns, and a punch cylinder is arranged at the center of the punch base;

[0004] A movable die plate is slidably installed below the punch base on the support column, the male die unit is fixed below the movable die plate, and the female die unit is installed on the upper end surface of the machine base and directly below the male die unit;

[0005] The female die unit comprises a lower die base, a middle cavity is arranged in the middle part of the lower die base, four vertically arranged die plates are distributed in the middle cavity, the four die plates are combined to form a forming cavity, soft pressing mechanisms are arranged on the circumferential sidewalls of the lower die base, and the soft pressing mechanisms are connected with the die plates in correspondence;

[0006] An intelligent mechanical hand is arranged outside the machine base.

[0007] Further, as a preferred, the four die plates are slidably matched with each other, and the extrusion end surface of each die plate is in sliding contact with the sidewall of the adjacent die plate;

[0008] Positioning holes are arranged at the four corner positions of the lower die base, and a plurality of positioning rods are vertically fixed below the male die unit, and each positioning rod is slidably connected with the positioning hole.

[0009] Further, as preferred, a pre-bending mechanism is arranged outside the base, and the discharging end of the pre-bending mechanism is connected to the conveying belt to convey the pre-bent battery shell to the grabbing station of the intelligent robot.

[0010] Further, as preferred, the soft pressing mechanism comprises a plurality of mounting frames symmetrically distributed, a bottom plate is fixed to the lower end surface of the lower die seat, each mounting frame is fixed to the upper end surface of the bottom plate through bolts, a limiting frame is fixed to the mounting frame, a connecting shaft seat is slidingly arranged in the limiting frame, and a hydraulic cylinder is horizontally fixed in the connecting shaft seat.

[0011] One side end surface of the die plate is horizontally fixed with a track plate, a damping plate is slidingly arranged on the track plate through a sliding block, and the output end of the hydraulic cylinder is connected to the damping plate.

[0012] Further, as preferred, a control motor is horizontally fixed to the mounting frame, a cam is fixed to the output end of the control motor, and a connecting rod is articulated to the cam; a compression spring is arranged between the connecting shaft seat and the limiting frame, and the other end of the connecting rod is articulated to the connecting shaft seat.

[0013] Further, as preferred, the damping plate is composed of a movable plate and a fixed plate, the fixed plate is slidingly connected to the track plate, and a plurality of spring struts are connected between the movable plate and the fixed plate.

[0014] The damping plate is filled with hydraulic oil, and an oil hole is formed in the inside of the fixed plate, and a hydraulic pipe is connected to the outside of the oil hole.

[0015] Further, as preferred, the extruding end surfaces of the two die plates located at the joint positions of the battery shell are respectively embedded with glue pressing wheels, the glue pressing wheels are slidingly arranged in the die plates through wheel frames, and internal springs are arranged between the wheel frames and the die plates.

[0016] Further, as preferred, the punch unit comprises an upper die seat, a punch block slidingly matched with the forming cavity is vertically fixed in the upper die seat, angle straight blocks are arranged at three corner positions in the punch block, guide plug rods are fixed to the angle straight blocks, and the other ends of the guide plug rods are slidingly connected in the punch block and are arranged towards the center of the punch block.

[0017] Further, as preferred, a hydraulic cavity is formed in the middle part of the punch block, sealing channels are distributed around the hydraulic cavity, and the guide plug rods are slidingly connected in the sealing channels.

[0018] Further, as preferred, a plurality of supporting springs are connected between each angle straight block and the punch block, and a hydraulic pump is connected to the outside of the hydraulic cavity.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The present application mainly carries out final extrusion forming on the pre-bent forming aluminum alloy battery shell, wherein the battery shell can be conveyed to the concave die unit through feeding, a plurality of die plates can cooperate to form a deformable adjustable forming cavity, and the forming cavity can be retracted under the driving of the soft pressing mechanism, thereby gradually extruding and shaping the battery shell, which can realize accurate splicing of the edge seams of the battery shell and avoid the size difference of the splicing seams caused by direct stamping, can also adapt to the battery shell made of lightweight high-strength aluminum alloy material, prevent the battery shell from cracking and tearing due to excessive instantaneous deformation caused by one-time stamping, and improve the adaptability to high-strength aluminum alloy material; the convex die unit is also provided, which can precisely extrude the bent edge of the battery shell by using three angle straight blocks to avoid material rebound at the bent part. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 It is a schematic diagram of the structure of the stamping seat and the stamping cylinder in the present application;

[0023] Figure 3 It is a schematic diagram of the structure of the concave die unit in the present application;

[0024] Figure 4 It is a schematic diagram of the overall structure of the soft pressing mechanism in the present application;

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of the convex die unit and the soft pressing mechanism in the present application;

[0026] Figure 6 It is a schematic diagram of the structure of the damping plate in the present application;

[0027] Figure 7 It is a schematic diagram of the installation structure of the rubber pressing wheel in the present application;

[0028] Figure 8 It is Figure 5 A-A cross-sectional view of the convex die unit in the present application;

[0029] In the figure: 1, base; 11, support column; 2, stamping seat; 21, stamping cylinder; 22, movable template; 23, bottom plate; 3, concave die unit; 31, lower die seat; 32, die plate; 33, positioning rod; 34, track plate; 35, damping plate; 36, movable plate; 37, fixed plate; 38, spring support column; 39, oil hole; 4, convex die unit; 41, upper die seat; 42, convex die block; 43, angle straight block; 44, guide plug rod; 45, hydraulic cavity; 46, top support spring; 5, soft pressing mechanism; 51, mounting frame; 52, limiting frame; 53, connecting shaft seat; 54, hydraulic cylinder; 55, control motor; 56, cam; 57, connecting rod; 6, rubber pressing wheel. DETAILED DESCRIPTION

[0030] Please refer to Figures 1-8 In the embodiment of the present application, a light-weight high-strength aluminum alloy blade battery shell extrusion forming device comprises a base 1, a stamping seat 2, a convex die unit 4 and a concave die unit 3, the upper end surface of the base 1 is vertically fixed with four symmetrical support columns 11, the stamping seat 2 is fixed at the upper end of the four support columns 11, so as to form a relatively stable high-rigidity frame, ensuring the stability of pressure transmission during stamping, and a stamping cylinder 21 is arranged at the center of the stamping seat 2 for providing stamping forming power;

[0031] A movable template 22 is slidably installed below the stamping seat 2 on the support column 11, the convex die unit 4 is fixed below the movable template 22, and the concave die unit 3 is installed on the upper end surface of the base 1 and directly below the convex die unit 22, so that the convex die unit 4 can be gradually assembled with the concave die unit 3 by vertical sliding of the movable template 22, thereby realizing extrusion forming of the battery shell in the concave die unit 3;

[0032] The concave die unit 3 comprises a lower die seat 31, a middle cavity is arranged in the middle part of the lower die seat 31, four vertically arranged die plates 32 are arranged in the middle cavity, the four die plates 32 are combined to form a forming cavity, and a soft pressing mechanism 5 is arranged on the circumferential sidewall of the lower die seat 31, and the soft pressing mechanism 5 is connected with the die plate 32 in correspondence;

[0033] In the conventional technology, the extrusion forming die of the battery shell is a metal die, the extrusion cavity in the metal die is in a fixed state and cannot be adjusted, high-strength aluminum alloy is prone to non-uniform deformation in the process of instantaneous extrusion, and since the fixed die cavity cannot be adjusted, the product after extrusion deformation cannot meet the production standard, and only scrap processing can be performed, so the yield is low; in the present application, the four die plates 32 can be combined and assembled to form a deformable die cavity structure, which can realize soft forming of the battery shell under the driving of the soft pressing mechanism 5, thereby ensuring forming precision and preventing shearing and tearing caused by direct stamping to a certain extent, and improving production forming quality;

[0034] The machine base 1 is externally provided with an intelligent mechanical hand for the feeding and discharging operation of the battery shell.

[0035] In the embodiment, the four mold plates 32 are slidably matched with each other, and the extrusion end surface of each mold plate 32 is in sliding contact with the side wall of the adjacent one of the mold plates 32. In this way, the four mold plates 32 are slidably matched with each other, so that the forming cavity can be adjusted and deformed. The forming cavity can have different or same length and width. When the forming cavity is deformed at the initial stage of extrusion, the length-width ratio of each mold plate 32 can be maintained in the sliding process, so that the equal ratio contraction is realized, so as to provide a certain extrusion allowance for subsequent soft compression molding, and the battery shell is conveniently extruded and molded step by step.

[0036] The lower die seat 31 is provided with positioning holes at four corner positions, and the lower part of the punch unit 4 is vertically fixed with a plurality of positioning rods 33, each of which is slidably connected with the positioning hole, so as to ensure that the lower die seat 31 and the punch unit 4 are centrally positioned.

[0037] As a preferred embodiment, the machine base 1 is provided with a pre-bending mechanism (not shown in the figure) on the outer side. The pre-bending mechanism is mainly used for pre-bending the aluminum alloy blank to form the initial shape of the battery shell. Since the joint gap after bending is large, the initially molded battery shell can be extruded for secondary molding, and finally a high-precision splicing effect is achieved. The discharge end of the pre-bending mechanism is connected with a conveying belt to convey the pre-bending molded battery shell to the grabbing station of the intelligent mechanical hand.

[0038] In the embodiment, the soft compression mechanism 5 includes a plurality of mounting frames 51 which are symmetrically distributed. The lower end surface of the lower die seat 31 is fixed with a bottom plate 23, each of the mounting frames 51 is fixed on the upper end surface of the bottom plate 23 by bolts, a limiting frame 52 is fixed on the mounting frame 51, a connecting shaft seat 53 is slidably assembled in the limiting frame 52, and a hydraulic cylinder 54 is horizontally fixed in the connecting shaft seat 53.

[0039] One side end surface of the mold plate 32 is horizontally fixed with a track plate 34, the track plate 34 is slidably provided with a damping plate 35 through a sliding block, and the output end of the hydraulic cylinder 54 is connected with the damping plate 35. Each hydraulic cylinder 54 can realize accurate adjustment of the mold plate 32 in the extension and contraction. Specifically, when the battery shell is placed in the concave die unit 3, the forming cavity formed between each mold plate 32 is in the maximum state, which facilitates the rapid alignment of the battery shell. When the battery shell is gradually extruded and molded, the hydraulic cylinder 54 can be extended, at which time the forming cavity space is reduced, so as to realize the extrusion molding of the battery shell. When the forming cavity between the mold plates 32 reaches the specified molding size, the punch unit 4 is slid downward and punches to cooperate with the forming cavity, so as to realize the final punch molding of the battery shell.

[0040] In this embodiment, the mounting frame 51 is horizontally fixed with a control motor 55, the output end of the control motor 55 is fixed with a cam 56, the cam 56 is universally articulated with a connecting rod 57; the connecting shaft seat 53 and the limiting frame 52 are provided with a compression spring, and the other end of the connecting rod 57 is articulated with the connecting shaft seat 53; wherein the control motor 55 can realize one-way rotation of the cam 56 in continuous operation, at this time the cam 56 can push the connecting shaft seat 53 to reciprocate slightly by the connecting rod 57, therefore, it can realize the vibration type hole shrinking extrusion of the mold plate 32 in the shrinking process, the advantage of such design is that it provides a certain frequency of vibration energy for the battery shell extrusion forming, so that it produces a local tiny deformation effect, which helps to reduce the bending strength of the aluminum alloy blank, reduces the deformation recovery in the later extrusion, which can be combined with the step-by-step extension and advancement movement of the hydraulic cylinder 54, so as to achieve soft pressure forming of the battery shell.

[0041] In this embodiment, the damping plate 35 is composed of a movable plate 36 and a fixed plate 37, the fixed plate 37 is slidably connected with the track plate 34, and a plurality of spring struts 38 are connected between the movable plate 36 and the fixed plate 37.

[0042] The damping plate 35 is filled with hydraulic oil, and the inside of the fixed plate 37 is provided with an oil hole 39, and the outside of the oil hole is connected with a hydraulic pipe, which can make the damping plate 35 as a whole to achieve the rigid effect by filling the hydraulic oil in the damping plate 35; therefore, in use, on the one hand, the inside of the damping plate 35 is filled with hydraulic oil, so that the hydraulic cylinder 54 outside the damping plate 35 and the mold plate 32 realize rigid connection effect, the hydraulic cylinder 54 can form a standard forming cavity under the sliding advancement of the mold plate 32, so that it can cooperate with the punch unit 4 to gradually extrude the battery shell; on the other hand, when the hydraulic oil in the damping plate 35 is not filled, the hydraulic cylinder 54 outside the damping plate 35 and the mold plate 32 are movably connected, so that the hydraulic cylinder 54 can form a forming cavity smaller than the standard form under the sliding advancement of the mold plate 32, so that it can cooperate with the punch unit 4 to impact extrusion forming (it should be noted that although the hydraulic cylinder 54 makes the forming cavity smaller than the standard form, the forming cavity is still larger than the overall volume of the punch unit 4, so that the punch unit 4 can always be in sliding cooperation with the forming cavity for extrusion forming operation, and the mold will not be bumped), in the impact extrusion forming, the distance between the movable plate 36 and the fixed plate 37 of the damping plate 35 becomes smaller, each mold plate 32 can slide correspondingly, and finally form a standard forming cavity; so that the aluminum alloy blank battery shell with different strengths can be selected for extrusion in different ways, so as to improve the production quality of the battery shell.

[0043] As a preferred embodiment, the extruding end faces of the two die plates 32 located at the joint positions of the battery shell are respectively embedded with rubber pressing wheels 6. In this case, a larger gap exists at the joint position of each battery shell before molding. When the battery shell is placed into the molding cavity, the joint gap of the battery shell needs to be aligned with the two die plates 32 provided with the rubber pressing wheels 6. The rubber pressing wheels 6 are slidingly assembled in the die plates 32 through a wheel frame. An inner spring (not shown in the figure) is arranged between the wheel frame and the die plate 32, so that a certain contact pressure is achieved between the rubber pressing wheels 6 and the battery shell, and the battery shell is in flexible contact with the two die plates 32, thereby improving the activity of the joint position of the battery shell and facilitating molding.

[0044] In the embodiment, the punch unit 4 comprises an upper die seat 41, and a punch block 42 slidingly matched with the molding cavity is vertically fixed in the upper die seat 41. Angle straight blocks 43 are arranged at three corner positions in the punch block 42, and guide plug rods 44 are fixed on the angle straight blocks 43. The other ends of the guide plug rods 44 are slidingly connected in the punch block 42 and are arranged towards the center of the punch block 42.

[0045] In the embodiment, a hydraulic cavity 45 is arranged in the middle of the punch block 42, and sealing channels are distributed around the hydraulic cavity 45. The guide plug rods 44 are slidingly connected in the sealing channels. Therefore, the guide plug rods 44 can realize synchronous adjustment of the three angle straight blocks 43 under the hydraulic driving, so that the angle straight blocks 43 can sufficiently extrude the bending position of the battery shell.

[0046] In the embodiment, a plurality of supporting springs 46 are connected between the angle straight blocks 43 and the punch block 42, and a liquid pump is connected outside the hydraulic cavity 45.

[0047] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A light weight high strength aluminum alloy blade battery shell extrusion forming device, comprising a machine base (1), a punching seat (2), a male die unit (4) and a female die unit (3), characterized in that: The upper end surface of the base (1) is vertically fixed with four symmetrically distributed support columns (11), the stamping seat (2) is fixed at the upper end of the four support columns (11), and the stamping seat (2) is provided with a stamping cylinder (21) at the center. The movable die plate (22) is slidably installed on the support column (11) below the stamping seat (2), the punch unit (4) is fixed below the movable die plate (22), and the concave die unit (3) is installed on the upper end surface of the base (1) and located directly below the punch unit (4). The concave die unit (3) comprises a lower die seat (31) provided with a middle cavity in the middle, four vertically arranged die plates (32) are distributed in the middle cavity, the four die plates (32) are combined to form a forming cavity, and soft pressing mechanisms (5) are arranged on the circumferential side walls of the lower die seat (31), and the soft pressing mechanisms (5) are connected with the die plates (32) correspondingly. An intelligent mechanical hand is arranged outside the base (1). The four die plates (32) are slidably matched with each other, and the extrusion end surface of each die plate (32) is in sliding contact with the side wall of the adjacent die plate (32). The soft pressing mechanism (5) comprises a mounting frame (51) which is symmetrically distributed, a bottom plate (23) is fixed to the lower end surface of the lower die seat (31), each mounting frame (51) is fixed to the upper end surface of the bottom plate (23) through bolts, a limiting frame (52) is fixed to the mounting frame (51), a connecting shaft seat (53) is slidably arranged in the limiting frame (52), and a hydraulic cylinder (54) is horizontally fixed in the connecting shaft seat (53). One side end surface of the die plate (32) is horizontally fixed with a track plate (34), the track plate (34) is slidably provided with a damping plate (35) through a sliding block, and the output end of the hydraulic cylinder (54) is connected with the damping plate (35). The damping plate (35) is composed of a movable plate (36) and a fixed plate (37), the fixed plate (37) is slidably connected with the track plate (34), and a plurality of spring support columns (38) are connected between the movable plate (36) and the fixed plate (37). The damping plate (35) is filled with hydraulic oil, and the inside of the fixed plate (37) is provided with an oil hole (39), and the oil hole is connected with a hydraulic pipe.

2. The light-weight high-strength aluminum alloy blade battery shell extrusion forming device according to claim 1, characterized in that: Positioning holes are arranged at the four corner positions of the lower die seat (31), and a plurality of positioning rods (33) are vertically fixed below the punch unit (4), and each positioning rod (33) is slidably connected with the positioning hole.

3. The light-weight high-strength aluminum alloy blade battery shell extrusion forming device according to claim 1, characterized in that: A pre-bending mechanism is arranged outside the base (1), and the pre-bending mechanism is connected with the intelligent mechanical hand through a conveying belt.

4. The light-weight high-strength aluminum alloy blade battery shell extrusion forming device according to claim 1, characterized in that: A control motor (55) is horizontally fixed to the mounting frame (51), a cam (56) is fixed to the output end of the control motor (55), and a connecting rod (57) is articulated to the cam (56); a compression spring is arranged between the connecting shaft seat (53) and the limiting frame (52), and the other end of the connecting rod (57) is articulated with the connecting shaft seat (53).

5. The light-weight high-strength aluminum alloy blade battery shell extrusion forming device according to claim 1, characterized in that: The extruding end faces of the two die plates (32) located at the joint positions of the battery shell are respectively embedded with glue pressing wheels (6), the glue pressing wheels (6) are slidingly assembled in the die plates (32) through wheel frames, and internal springs are arranged between the wheel frames and the die plates (32).

6. The light-weight high-strength aluminum alloy blade battery shell extrusion forming device according to claim 1, characterized in that: The male die unit (4) comprises an upper die seat (41), a male die block (42) slidingly matched with a forming cavity is vertically fixed in the upper die seat (41), corner straight blocks (43) are arranged at three corner positions in the male die block (42), guide plug rods (44) are fixed on the corner straight blocks (43), and the other ends of the guide plug rods (44) are slidingly connected in the male die block (42) and are arranged towards the center of the male die block (42).

7. The light-weight high-strength aluminum alloy blade battery shell extrusion forming device according to claim 6, characterized in that: A hydraulic cavity (45) is arranged in the middle part of the male die block (42), and sealing channels are distributed on the periphery of the hydraulic cavity (45), and the guide plug rods (44) are slidingly connected in the sealing channels.

8. The light-weight high-strength aluminum alloy blade battery shell extrusion forming device according to claim 7, characterized in that: A plurality of top supporting springs (46) are connected between each corner straight block (43) and the male die block (42), and a liquid pump is connected outside the hydraulic cavity (45).

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