A surface damage simulation device for sheet metal deep drawing and thinning deep drawing

Abstract

The present invention discloses a surface damage simulation device for sheet metal drawing and thinning, comprising: a support platform for installing a working component and a traction component; the working component is used to directly contact the sheet metal to achieve top bending and thinning stretching of the sheet metal; the traction component is used to drive the sheet metal through the working component. The present invention can accurately simulate the stress-strain state of the sheet metal during the drawing and thinning process, can examine the influence of factors such as molds, sheet metal and forming conditions on the sheet metal forming quality, and guide actual production.

Description

Technical Field

[0001] The invention belongs to the field of sheet metal stamping and forming, and relates to the testing and evaluation of sheet metal stamping surface damage, and more specifically, to a surface damage simulation device for sheet metal deep drawing and thinning deep drawing. Background Art

[0002] With the development of the new energy industry, the demand for high-thinning lithium battery steel shells has greatly increased. High-thinning lithium battery steel shells need to undergo multiple deep drawing and thinning drawing to form. Multi-pass deep drawing distributes the total deformation of the parts in deep drawing, and each deep drawing only completes a part of the deformation. However, the blanks of multi-pass deep drawing are semi-finished parts, which are poor in mechanical properties and thickness uniformity, and are in contact with the mold many times, which is prone to surface damage and defects. Thinning drawing is often combined with the deep drawing process to process various deep-drawn products, but high thinning brings high risks. The thinning and drawing deformation zone is in a complex stress state. The sheet material slides and the contact stress and shear force between the sheet and the mold are large. Adhesion wear may occur, resulting in damage to the surface of the battery shell, reducing the mechanical properties and performance of the battery shell, and even directly causing product failure and scrapping.

[0003] Therefore, designing a suitable surface damage simulation device, studying the influence of various influencing factors on sheet metal surface damage, and carrying out sheet metal surface damage testing and evaluation work can effectively reduce or avoid sheet metal surface damage and die wear during the processing and manufacturing process. Sheet metal surface damage essentially originates from the friction between the die and the sheet metal, and is mainly affected by factors such as the sheet metal, the die, and the forming conditions. At present, when studying the surface damage phenomenon in sheet metal stamping, researchers mainly consider how to simulate the friction and wear state of the contact interface between the die and the sheet metal during stamping, and have invented methods and corresponding devices such as bending method, sheet metal stretching method, cylindrical part drawing method, and wear test method.

[0004] In existing patent applications, such as publication number CN 107255582A, a rapid simulation experimental device for sheet metal stamping surface damage is disclosed. The device can quickly and conveniently simulate the sheet metal burring phenomenon under different stamping process conditions and qualitatively evaluate the burring defects. However, it can only simulate the contact and friction conditions between the sheet metal and the mold, and cannot reflect the stress-strain state of the sheet metal during the drawing and thinning drawing process, and cannot quantitatively evaluate the surface damage, so its application scope is limited.

[0005] For example, publication number CN101082545A discloses a device for inducing burr defects on the surface of automobile panels, which uses deep drawing of shallow-bottomed conical box-shaped parts with draw ribs to simulate burr defects in the stamping process of automobile covers. This sheet metal forming method can more accurately simulate the stress-strain state of the sheet metal during the stamping process of automobile covers, but the mold structure used in this patented technology is complex, and a large number of stamping experiments are required, which is costly. Summary of the invention

[0006] In view of the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide a surface damage simulation device for sheet metal drawing and thinning drawing, which can accurately simulate the stress-strain state of the sheet metal during the drawing and thinning drawing process, and can examine the influence of influencing factors such as molds, sheet metal and forming conditions on the sheet metal forming quality, so as to guide actual production.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A surface damage simulation device for sheet metal deep drawing and thinning deep drawing, comprising:

[0009] Support platform for installing working parts and traction parts;

[0010] The working component is used to directly contact the sheet material to achieve top bending and thinning and stretching of the sheet material;

[0011] The traction component is used to drive the sheet material to pass through the working component.

[0012] Preferably, the support platform comprises a lower support platform and an upper support platform arranged thereon;

[0013] The lower supporting platform and the upper supporting platform are both provided with threaded holes and mounting holes for mounting the working components, the auxiliary components and the traction components.

[0014] Preferably, the working parts include a edge holding mechanism, a roller mechanism, a top bending die and a thinning die which are arranged in sequence along the sheet material feeding direction.

[0015] Preferably, the edge pressing mechanism comprises an upper edge pressing block, a lower edge pressing block and an edge pressing stud;

[0016] The lower edge pressure block is arranged on the upper surface of the lower support platform, and the upper edge pressure block is arranged on the lower surface of the upper support platform through a spring;

[0017] The edge-pressing stud passes through the threaded hole of the upper supporting platform and contacts the upper edge-pressing block. The edge-pressing stud is rotated to realize the vertical movement of the upper edge-pressing block relative to the lower edge-pressing block.

[0018] Preferably, the roller mechanism is disposed on the lower supporting platform, and includes a first roller located between the edge holding mechanism and the top bending mold, and a second roller located between the top bending mold and the thinning mold.

[0019] Preferably, the top bending mold includes a first mold body, a first upper pad, a pressing head, a connector and a screw rod;

[0020] The first mold body passes through the mounting hole of the upper supporting platform, and a first slideway perpendicular to the running direction of the sheet material is provided in the first mold body;

[0021] The first upper pad is disposed in the first slideway, and the pressing head is embedded in the first upper pad and disposed toward the upper surface of the sheet material;

[0022] The screw rod is arranged on the upper surface of the upper supporting platform, and a slider is connected to the thread of the screw rod;

[0023] One end of the connector is connected to the slider, and the other end is connected to the first upper pad.

[0024] Preferably, the thinning die comprises a second die body, a second upper pad, an upper pressure head, a lower pressure head, a lower pad and an oil cylinder;

[0025] The second mold body passes through the mounting hole of the upper supporting platform, and a second slideway perpendicular to the running direction of the sheet material is provided in the second mold body;

[0026] The second upper pad is arranged in the second slideway, and the upper pressing head is embedded in the second upper pad and arranged toward the upper surface of the sheet material;

[0027] The oil cylinder is arranged on the upper surface of the upper supporting platform, and its output shaft is connected to the second upper pad;

[0028] The lower pad is arranged on the upper surface of the lower supporting platform, and the lower pressure head is embedded in the lower pad and arranged toward the lower surface of the sheet material;

[0029] The upper pressure head is arranged opposite to the lower pressure head.

[0030] Preferably, the traction components include a feed roller, a chuck, a slide rail, a traction rope, a pulley, a rope winding roller, a V-belt and a stepping motor;

[0031] The feeding roller is arranged on the upper surface of the lower supporting platform and is located at the inlet position of the sheet material;

[0032] The slide rail is arranged on the upper surface of the lower support platform, located at the exit position of the sheet material, and the chuck is arranged on the slide rail;

[0033] The pulley is fixedly connected to the rope winding roller and is arranged on the upper surface of the lower support platform and behind the slide rail;

[0034] One end of the traction rope is connected to the clamp, and the other end is connected to the rope winding roller;

[0035] The stepper motor is arranged on the lower supporting platform and drives the pulley and the rope winding roller to rotate through the V-belt.

[0036] Preferably, the pressing head of the top bending mold, and the upper pressing head and the lower pressing head of the thinning mold are all replaceable mold pressing heads.

[0037] Preferably, the surface damage simulation device performs surface damage simulation of sheet drawing and thinning by adjusting the stretching speed of the traction component, the clamping force of the top bending die, the thinning amount of the thinning die, and the curvature of the sheet through three-point bending.

[0038] The surface damage simulation device for sheet metal drawing and thinning provided by the present invention uses a top bending die to simulate the sheet metal drawing process, and achieves sheet metal thinning by stretching with a thinning die. It can simulate the stress-strain state and the contact conditions between the die and the sheet metal during the sheet metal drawing and thinning process, so the sheet metal surface damage can reflect the actual situation. At the same time, a replaceable die pressing head is used, and parameters such as curvature, thinning amount, blank holding force, and stretching speed can be adjusted, so the influence of the die, sheet metal, and stamping conditions on the sheet metal surface damage can be fully considered. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the surface damage simulation device of the present invention;

[0040] Figure 2 It is a schematic diagram of the principle of the surface damage simulation device of the present invention;

[0041] Figure 3 is a schematic diagram of a sheet material running on a surface damage simulation device of the present invention;

[0042] Figure 4 It is a schematic diagram of the pressure head, the upper pressure head and the lower pressure head in the surface damage simulation device of the present invention;

[0043] Figure 5 yes Figure 4 Side view of. DETAILED DESCRIPTION

[0044] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0045] Combination Figure 1 and Figure 3 As shown, the present invention provides a surface damage simulation device for sheet metal drawing and thinning drawing, comprising:

[0046] Support platform for installing working parts and traction parts;

[0047] Working parts, used for direct contact with the sheet material 3, to achieve top bending and thinning stretching of the sheet material 3;

[0048] The traction component is used to drive the sheet material 3 to pass through the working component.

[0049] The supporting platform comprises a lower supporting platform 1 and an upper supporting platform 4 arranged thereon, and the upper supporting platform 4 is fixed on the lower supporting platform 1 by welding.

[0050] The lower supporting platform 1 and the upper supporting platform 4 are both provided with threaded holes and mounting holes for mounting and fixing working parts, auxiliary parts and traction parts.

[0051] The working parts include a pressing mechanism, a roller mechanism, a top bending die and a thinning die which are sequentially arranged along the feeding direction of the sheet material 3 .

[0052] The edge pressing mechanism comprises an upper edge pressing block 5 , a lower edge pressing block 24 and an edge pressing stud 7 .

[0053] The lower edge block 24 is fixed to the upper surface of the lower support platform 1, and the upper edge block 5 is fixed to the lower surface of the upper support platform 4 through the spring 6. The upper edge block 5 is lifted away from the lower edge block 24 by the spring 6 to facilitate the passage of the sheet material 3.

[0054] The edge clamping stud 7 passes through the threaded hole of the upper supporting platform 4 and contacts the upper edge clamping block 5. By rotating the edge clamping stud 7, a downward displacement is applied to the upper edge clamping block 5, thereby realizing the vertical movement of the upper edge clamping block 5 relative to the lower edge clamping block 24, thereby clamping the sheet material 3.

[0055] The roller mechanism is arranged on the lower supporting platform 1, and comprises a first roller 8 located between the edge holding mechanism and the top bending mold, and a second roller 25 located between the top bending mold and the thinning mold.

[0056] Both ends of the roller bodies of the first roller 8 and the second roller 25 are sleeved on the bearings of the roller bracket and can rotate freely. The roller bracket is fixed to the lower supporting platform 1 by bolts, providing two fulcrums for the bending deformation of the sheet material 3.

[0057] The top bending mold includes a first mold body 9 , a first upper cushion block 15 , a pressing head 10 , a connector 11 and a screw rod 13 .

[0058] The first mold body 9 passes through the mounting hole of the upper supporting platform 4 , and a first slideway perpendicular to the running direction of the sheet material 3 is arranged in the first mold body 9 .

[0059] The first upper pad 15 is disposed in the first slideway and slides in the first slideway. The pressing head 10 is embedded in the first upper pad 15 and is disposed toward the upper surface of the sheet material 3 .

[0060] The lower end of the screw rod 13 is fixed to the upper surface of the upper support platform 4 through a bearing, and a slider 12 is sleeved on the thread of the screw rod 13 .

[0061] One end of the connector 11 is connected to the slider 12 , and the other end is connected to the first upper pad 10 .

[0062] The rotating screw 13 drives the slider 12, the connector 11, the first upper pad 15 and the pressing head 10 to move up and down. The connector 11 converts the circular motion of the screw 13 into the up and down linear motion of the first upper pad 15 and the pressing head 10 through the slider 12, thereby realizing the top bending of the sheet material 3 by the pressing head 10.

[0063] The thinning die includes a second die body 26 , a second upper pad 15 , an upper pressing head 27 , a lower pressing head 28 , a lower pad 16 and an oil cylinder 14 .

[0064] The second mold body 26 passes through the mounting hole of the upper supporting platform 4 , and a second slideway perpendicular to the running direction of the sheet material 3 is arranged inside the second mold body 26 .

[0065] The second upper pad 15 is disposed in the second slideway, and the upper pressing head 27 is embedded in the second upper pad 15 and disposed toward the upper surface of the sheet material 3 .

[0066] The oil cylinder 14 is fixed on the upper surface of the upper supporting platform 4 , and its output shaft is connected to the second upper cushion block 15 .

[0067] The lower pad 16 is fixed on the upper surface of the lower supporting platform 1 , and the lower pressing head 28 is embedded in the lower pad 16 and arranged toward the lower surface of the sheet material 3 .

[0068] The upper pressing head 27 and the lower pressing head 28 are arranged opposite to each other.

[0069] The oil cylinder 14 realizes the vertical linear motion of the output shaft of the oil cylinder 14 , the second upper pad 15 and the upper pressure head 27 by adjusting the oil pump and the pipeline valve, thereby realizing the thinning and stretching of the sheet material 3 between the upper pressure head 27 and the lower pressure head 28 .

[0070] The traction components include a feed roller 2 , a clamp 17 , a slide rail 18 , a traction rope 19 , a pulley 20 , a rope winding roller 21 , a V-belt 22 and a stepping motor 23 .

[0071] The feeding roller 2 is fixed on the upper surface of the lower supporting platform 1 and is located at the entrance position of the sheet material 3 (the left side position of the lower supporting platform 1).

[0072] The slide rail 18 is fixed on the upper surface of the lower support platform 1 and is located at the exit position of the sheet 3 (the right side position of the lower support platform 1). The chuck 17 is arranged on the slide rail 18 and moves left and right along the slide rail 18. The sheet 3 passes between the upper pressure head 27 and the lower pressure head 28 and is fixed on the chuck 17.

[0073] The pulley 20 is fixedly connected to the rope winding roller 21 by a key. The rope winding roller 21 is fixed to the upper surface of the lower supporting platform by bolts and is located behind the slide rail 18.

[0074] One end of the traction rope 19 is connected to the clamp 17 , and the other end is connected to the rope winding roller 21 .

[0075] The stepper motor 23 is fixed to the lower support platform 1 by bolts, and drives the pulley 20 and the rope roller 21 to rotate through the V-belt 22. The traction rope 19 is tensioned and drives the clamp 17 to move on the slide rail 18 to realize the feeding movement of the sheet material 3.

[0076] During the experiment, the blanking stud 7 and the screw rod 13 are first loosened, and the oil pump and pipeline valve of the oil cylinder 14 are adjusted so that the upper blanking block 5, the pressure head 10 and the upper pressure head 27 are all moved upward, and then the sheet 3 passes through the entire device and the right end is fixed on the chuck 17. Tighten the blanking stud 7, apply the blanking force to the sheet 3, start the stepper motor 23, the pulley 20 and the rope roller 21 rotate, the traction rope 19 is tightened and drives the chuck 17 and the sheet 3 to move to the right, and the sheet 3 is in a straight state. In the process of the sheet 3 moving to the right, tighten the screw rod 13 and adjust the oil pump and pipeline valve of the oil cylinder 14 so that the upper part of the top bending die and the thinning die move downward, so as to realize the top bending and thinning stretching of the sheet 3. In the process of the sheet 3 moving to the right, it contacts with the pressure heads on the top bending die and the thinning die and slides relatively, resulting in surface damage, thereby simulating the surface damage during the sheet drawing and thinning drawing process.

[0077] Combination Figure 2 As shown, the surface damage simulation device of the present invention simulates the deep drawing and thinning conditions of the sheet material through three-point bending and thinning stretching, simulates the roughening phenomenon of the battery shell surface during the stamping process, and examines the influence of the initial sheet material, stamping process and mold conditions on the surface damage during the deep drawing and thinning forming process of the battery shell. Among them, the bending pressure head of the three-point bending part is connected to the bending edge holding mechanism via the bending pressure head fixed block, and the pressure head 10 of the edge holding mechanism applies pressure F1 to the sheet material 3, so that the sheet material 3 is bent and deformed, simulating the process and mechanical state of the sheet material 3 entering the die during the deep drawing process; the upper pressure head 27 of the thinning die is connected to the oil cylinder 14 via the second upper pad 15, and the upper pressure head 27 applies pressure F2 to the strip through the oil cylinder 14, and the lower pressure head 28 is matched with the lower pad 16 in a clearance, and is placed on the weighing sensor, and the lower pressure head 28 provides a support reaction force -F2, so that the two sides of the sheet material 3 meet the two-force balance condition, and the purpose of stable thinning is achieved.

[0078] Combination Figure 4 and Figure 5As shown, the punch 10, the upper punch 27 and the lower punch 28 in the surface damage simulation device of the present invention adopt replaceable mold punches, and the parameters such as curvature, thinning amount, clamping force and stretching speed can be adjusted. Therefore, the influence of the mold, sheet material and stamping conditions on the surface damage of the sheet material can be fully considered.

[0079] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A surface damage simulation device for sheet metal drawing and thinning, characterized in that: include: Support platform for installing working parts and traction parts; The working component is used to directly contact the sheet material to achieve top bending and thinning and stretching of the sheet material; The traction component is used to drive the sheet material to pass through the working component. The support platform comprises a lower support platform and an upper support platform arranged thereon; The lower supporting platform and the upper supporting platform are both provided with threaded holes and mounting holes for mounting the working components, auxiliary components and the traction components. The working parts include a pressing mechanism, a roller mechanism, a top bending die and a thinning die arranged in sequence along the sheet material feeding direction. The edge pressing mechanism comprises an upper edge pressing block, a lower edge pressing block and an edge pressing stud; The lower edge pressure block is arranged on the upper surface of the lower support platform, and the upper edge pressure block is arranged on the lower surface of the upper support platform through a spring; The edge-pressing stud passes through the threaded hole of the upper support platform and contacts the upper edge-pressing block, and the edge-pressing stud is rotated to realize the vertical movement of the upper edge-pressing block relative to the lower edge-pressing block. The roller mechanism is arranged on the lower supporting platform, and comprises a first roller located between the edge holding mechanism and the top bending mold, and a second roller located between the top bending mold and the thinning mold. The top bending mold comprises a first mold body, a first upper pad, a pressing head, a connector and a screw rod; The first mold body passes through the mounting hole of the upper supporting platform, and a first slideway perpendicular to the running direction of the sheet material is provided in the first mold body; The first upper pad is disposed in the first slideway, and the pressing head is embedded in the first upper pad and disposed toward the upper surface of the sheet material; The screw rod is arranged on the upper surface of the upper supporting platform, and a slider is connected to the thread of the screw rod; One end of the connector is connected to the slider, and the other end is connected to the first upper pad. The thinning die comprises a second die body, a second upper pad, an upper pressing head, a lower pressing head, a lower pad and an oil cylinder; The second mold body passes through the mounting hole of the upper supporting platform, and a second slideway perpendicular to the running direction of the sheet material is provided in the second mold body; The second upper pad is arranged in the second slideway, and the upper pressing head is embedded in the second upper pad and arranged toward the upper surface of the sheet material; The oil cylinder is arranged on the upper surface of the upper supporting platform, and its output shaft is connected to the second upper pad; The lower pad is arranged on the upper surface of the lower supporting platform, and the lower pressure head is embedded in the lower pad and arranged toward the lower surface of the sheet material; The upper pressure head is arranged opposite to the lower pressure head.

2. The surface damage simulation device for sheet metal drawing and thinning according to claim 1, characterized in that: The traction components include a feeding roller, a chuck, a slide rail, a traction rope, a pulley, a rope winding roller, a V-belt and a stepping motor; The feeding roller is arranged on the upper surface of the lower supporting platform and is located at the inlet position of the sheet material; The slide rail is arranged on the upper surface of the lower support platform, located at the exit position of the sheet material, and the chuck is arranged on the slide rail; The pulley is fixedly connected to the rope winding roller and is arranged on the upper surface of the lower support platform and behind the slide rail; One end of the traction rope is connected to the clamp, and the other end is connected to the rope winding roller; The stepper motor is arranged on the lower supporting platform and drives the pulley and the rope winding roller to rotate through the V-belt.

3. The surface damage simulation device for sheet metal drawing and thinning according to claim 1, characterized in that: The pressing head of the top bending mold, the upper pressing head and the lower pressing head of the thinning mold are all replaceable mold pressing heads.

4. The surface damage simulation device for sheet metal drawing and thinning according to any one of claims 1 to 3, characterized in that: The surface damage simulation device performs surface damage simulation of sheet drawing and thinning by adjusting the stretching speed of the traction component, the clamping force of the top bending die, the thinning amount of the thinning die, and the curvature of the sheet through three-point bending.

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