Automobile sheet metal part bending device and bending method

Abstract

The invention relates to the technical field of bending, in particular to an automobile sheet metal part bending device and method.The automobile sheet metal part bending device comprises a bottom plate, a vertical plate is fixedly connected to the upper side of the bottom plate, a top plate is fixedly connected to the upper side of the vertical plate, and an electric telescopic cylinder is fixedly connected to the bottom side wall of the top plate; an electric telescopic cylinder is fixedly connected to the bottom end of the top plate, a connecting plate is fixedly connected to the bottom end of the electric telescopic cylinder, a laser speed sensor is fixedly connected to the bottom side wall of the top plate, a linear vibrator is fixedly connected to the bottom side wall of the connecting plate, an upper bending die block is fixedly connected to the bottom end of the linear vibrator, and a vibration sensor is arranged on the side wall of the upper bending die block. According to the method, the elongation speed of the electric telescopic cylinder and the vibration frequency, the amplitude and the vibration time of the linear vibrator can be dynamically regulated and controlled by constructing the regulation and control coefficient GPK, and it can be ensured that the bending process is smoothly conducted and the bending quality is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of bending, and in particular to a bending device and a bending method for automobile sheet metal parts. Background Art

[0002] When sheet metal parts for automobiles are in use, they usually need to be bent by bending equipment so that the sheet metal parts can be installed inside the car and make the use of the sheet metal parts better.

[0003] High-frequency vibration bending is a method of shaping metal materials using high-frequency vibration energy. During the bending process, the vibration energy generated by the high-frequency vibration equipment acts on the metal material, causing alternating stresses inside the material. These alternating stresses help reduce the yield strength of the material and increase the plasticity of the material, making it easier for the material to deform.

[0004] The bending quality of sheet metal is related to high-frequency vibration bending process parameters such as vibration frequency, amplitude, and vibration time. However, in the actual high-frequency vibration bending process, the bending process parameters cannot be dynamically adjusted according to the material type and thickness of the sheet metal, which can easily reduce the bending quality, increase part processing errors, and affect the later use of the product. Summary of the invention

[0005] The present invention provides a bending device and a bending method for an automobile sheet metal part to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A bending device for automobile sheet metal parts comprises a bottom plate, a vertical plate is fixedly connected to the upper side of the bottom plate, a top plate is fixedly connected to the upper side of the vertical plate, an electric telescopic cylinder is fixedly connected to the bottom side wall of the top plate, a connecting plate is fixedly connected to the bottom end of the electric telescopic cylinder, a laser speed sensor is fixedly connected to the bottom side wall of the top plate, a linear vibrator is fixedly connected to the bottom side wall of the connecting plate, an upper bending mold block is fixedly connected to the bottom end of the linear vibrator, a vibration sensor is provided on the side wall of the upper bending mold block, a lower bending mold block is provided directly below the upper bending mold block, a mounting platform is fixedly connected to the bottom side wall of the lower bending mold block, the mounting platform is fixedly connected to the upper side of the bottom plate, and a rotating feeding device is provided on the upper side of the bottom plate; It also includes a control mechanism, which is used to adjust the extension speed of the electric telescopic cylinder, and the vibration frequency, amplitude, and vibration time of the linear vibrator to ensure the bending quality of the automobile sheet metal parts.

[0007] Preferably, the rotating feeding device includes a rotating column, the bottom end of the rotating column is rotatably connected to the upper side of the base plate through a bearing, the upper side of the base plate is fixedly connected to a servo motor, the upper end of the servo motor is fixedly connected to a second gear, the side wall of the second gear is meshingly connected to a first gear, the first gear is fixedly connected to the rotating column, the upper end of the rotating column is fixedly connected to a rotating plate, the rotating plate is arranged in a square plate shape, the four sides of the upper side of the rotating plate are fixedly connected to a fixed box, each of the fixed boxes is threadedly connected to a threaded rod on the upper side, each of the threaded rods is fixedly connected to a handle on the upper end, the bottom end of each handle is rotatably connected to a pressure plate, and each pressure plate is vertically slidably connected in the fixed box.

[0008] Preferably, the control mechanism includes a control module, a detection module, and a processing module; The control module is connected to the electrical signals of the electric telescopic cylinder and the linear vibrator; The detection module includes a speed reduction detection unit for detecting the descending speed of the upper bending mold block when the automobile sheet metal part is bent, and a vibration detection unit for detecting the vibration frequency, amplitude, and vibration time of the upper bending mold block; The processing module includes an evaluation unit and a judgment unit.

[0009] Preferably, the speed reduction detection unit is a laser speed sensor, and the laser speed sensor is used to obtain the descending speed of the upper bending mold block by detecting the descending speed of the connecting plate.

[0010] Preferably, the vibration detection unit is a vibration sensor, and the vibration sensor is used to detect the vibration frequency, amplitude and vibration time of the upper bending mold block.

[0011] Preferably, when the sheet metal part is clamped between the bottom side of the pressing plate and the bottom side wall of the fixed box, the sheet metal part and the upper surface of the lower bending mold block are in the same horizontal plane.

[0012] A method for bending an automobile sheet metal part, applied to any one of the above-mentioned automobile sheet metal part bending devices, the bending method comprising the following steps: In the first step, the automobile sheet metal to be bent is placed into the fixed box, and then the threaded rod is twisted by the handle to lower the pressing plate until the pressing plate presses the sheet metal down and clamps it in the fixed box. Then the servo motor is started, and the servo motor can drive the rotating column to rotate through the second gear and the first gear. The rotation of the rotating column can drive the rotating plate to rotate, and then the servo motor can drive the automobile sheet metal to be bent clamped on the upper side of the rotating plate to enter the upper surface of the lower bending mold block; In the second step, the linear vibrator is started again to make the upper bending mold block vibrate at a high frequency, and the electric telescopic cylinder is started to extend at the same time, so that the high-frequency vibrating upper bending mold block is gradually pressed down and close to the lower bending mold block, thereby realizing high-frequency vibration bending of the sheet metal; The third step is that during the high-frequency vibration bending process, the speed reduction detection unit and the vibration detection unit in the detection module are used to detect the descending speed, vibration frequency, amplitude, and vibration time of the upper bending mold block during the bending of the sheet metal part, respectively, to form the speed reduction B, vibration frequency T, amplitude Y, and vibration time N, and transmit them to the evaluation unit for evaluation. If at least one of them exceeds the corresponding first preset threshold, judgment information is formed; The fourth step is to summarize the obtained speed reduction B, vibration frequency T, amplitude Y, and vibration time N to form the detection condition information, build a data model and optimize it, and perform regression analysis on the obtained speed reduction B, vibration frequency T, amplitude Y, and vibration time N through analysis software to obtain the influence of speed reduction B, vibration frequency T, amplitude Y, and vibration time N on the bending quality of sheet metal parts, and output the speed reduction influence factor Ab, vibration frequency influence factor At, amplitude influence factor Ay, and vibration time influence factor An; In the fifth step, the evaluation unit obtains the speed reduction B, vibration frequency T, amplitude Y, and vibration time N, and performs dimensionless processing on them, and associates them to form the control coefficient GPK. The association model is:

[0013] Among them, Ab represents the deceleration influence factor, 0.11≤Ab≤0.59; At represents the vibration frequency influence factor, 0.43≤At≤0.84; Ay represents the amplitude influence factor, 0.24≤Ay≤0.91; An represents the vibration time influence factor, 0.34≤An≤0.72; BCL represents the influence coefficient of automobile sheet metal; P represents the thickness value of automobile sheet metal; M represents the influence factor of automobile sheet metal material, among which the aluminum alloy material takes a value of 1.5, the titanium alloy material takes a value of 1.2, and the stainless steel material takes a value of 0.9; In the sixth step, the obtained control coefficient GPK is transmitted to the judgment unit for comparison with the preset second preset threshold. If the control coefficient GPK is not within the range of the second preset threshold, a corresponding control instruction is generated to control the extension speed of the electric telescopic cylinder and the vibration frequency, amplitude and vibration time of the linear vibrator until the control coefficient GPK is within the second preset threshold to ensure the bending quality of the automobile sheet metal.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention can dynamically regulate the extension speed of the electric telescopic cylinder and the vibration frequency, amplitude and vibration time of the linear vibrator by constructing the regulation coefficient GPK, thereby ensuring the smooth progress of the bending process and the stability of the bending quality.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A schematic diagram of the three-dimensional structure of a bending device for automobile sheet metal parts proposed by the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure of an automobile sheet metal bending device proposed by the present invention; Figure 3 is a schematic diagram of the connection structure between the first gear and the second gear in the present invention; Figure 4 for Figure 2 Schematic diagram of the locally enlarged structure of A in the middle.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Bottom plate; 2. Turntable; 3. First gear; 4. Turntable; 5. Servo motor; 6. Second gear; 7. Mounting table; 8. Lower bending die block; 9. Vibration sensor; 10. Upper bending die block; 11. Linear vibrator; 12. Connecting plate; 13. Electric telescopic cylinder; 14. Top plate; 15. Laser speed sensor; 16. Handle; 17. Threaded rod; 18. Pressing plate; 19. Fixed box; 20. Sheet metal; 21. Vertical plate. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0019] See also Figures 1 to 4In an embodiment of the present invention, a bending device for automobile sheet metal parts includes a bottom plate 1, a vertical plate 21 is fixedly connected to the upper side of the bottom plate 1, a top plate 14 is fixedly connected to the upper side of the vertical plate 21, an electric telescopic cylinder 13 is fixedly connected to the bottom side wall of the top plate 14, a connecting plate 12 is fixedly connected to the bottom end of the electric telescopic cylinder 13, a laser speed sensor 15 is fixedly connected to the bottom side wall of the top plate 14, a linear vibrator 11 is fixedly connected to the bottom side wall of the connecting plate 12, an upper bending mold block 10 is fixedly connected to the bottom end of the linear vibrator 11, a vibration sensor 9 is provided on the side wall of the upper bending mold block 10, a lower bending mold block 8 is provided directly below the upper bending mold block 10, the upper side of the lower bending mold block 8 coincides with the lower side of the upper bending mold block 10, a mounting platform 7 is fixedly connected to the bottom side wall of the lower bending mold block 8, the mounting platform 7 is fixedly connected to the upper side of the bottom plate 1, and a rotating feeding device is provided on the upper side of the bottom plate 1; See also Figure 1 and Figure 2 The rotating feeding device includes a rotating column 4, the bottom end of which is rotatably connected to the upper side of the base plate 1 through a bearing, a servo motor 5 is fixedly connected to the upper side of the base plate 1, a second gear 6 is fixedly connected to the upper end of the servo motor 5, a first gear 3 is meshed and connected to the side wall of the second gear 6, the first gear 3 is fixedly connected to the rotating column 4, the upper end of the rotating column 4 is fixedly connected to a rotating plate 2, the rotating plate 2 is arranged in a square plate shape, and the four sides of the upper side of the rotating plate 2 are fixedly connected to fixed boxes 19, each fixed box 19 is threadedly connected to a threaded rod 17 through the upper side, each threaded rod 17 is fixedly connected to a handle 16 at the upper end, and each handle 16 is rotatably connected to a pressing plate 18 at the bottom end, and each pressing plate 18 is vertically slidably connected to the corresponding fixed box 19. When bending the automobile sheet metal part 20, one side of the automobile sheet metal part 20 to be bent can be first placed in the fixed box 19, and then The handle 16 turns the threaded rod 17 to make the pressing plate 18 descend until the pressing plate 18 presses down one side of the sheet metal part 20 and clamps it in the fixed box 19. When the sheet metal part 20 is clamped between the bottom side of the pressing plate 18 and the inner bottom side wall of the fixed box 19, the bottom side surface of the sheet metal part 20 is in the same horizontal plane as the upper surface of the lower bending mold block 8. Then the servo motor 5 is started. The servo motor 5 can drive the rotating column 4 to rotate through the second gear 6 and the first gear 3. The rotation of the rotating column 4 can drive the rotating plate 2 to rotate, and then the servo motor 5 can drive the automobile sheet metal part 20 to be bent on the upper side of the rotating plate 2 to enter the upper surface of the lower bending mold block 8, so as to facilitate the subsequent bending process; when the automobile sheet metal part 20 is bent, the control 2 is rotated ninety degrees again, and the new part of the sheet metal part 20 to be bent to be bent is entered into the upper surface of the lower bending mold block 8 as above, so as to realize cyclic continuous bending; It also includes a control mechanism, which is used to adjust the extension speed of the electric telescopic cylinder 13, and the vibration frequency, amplitude, and vibration time of the linear vibrator 11 to ensure the bending quality of the automobile sheet metal parts.

[0020] The control mechanism includes a control module, a detection module, and a processing module; The control module is connected to the electrical signals of the electric telescopic cylinder 13 and the linear vibrator 11; A processing module, including an evaluation unit and a judgment unit; The detection module includes a speed reduction detection unit for detecting the descending speed of the upper bending mold block 10 when the automobile sheet metal is bent, and a vibration detection unit for detecting the vibration frequency, amplitude, and vibration time of the upper bending mold block 10; The speed reduction detection unit is a laser speed sensor 15, which is used to obtain the descending speed of the upper bending mold block 10 by detecting the descending speed of the connecting plate 12; the vibration detection unit is a vibration sensor 9, which is used to detect the vibration frequency, amplitude and vibration time of the upper bending mold block 10.

[0021] A method for bending an automobile sheet metal part, the method comprising the following steps: In the first step, the automobile sheet metal part 20 to be bent is first placed into the fixed box 19, and then the threaded rod 17 is twisted by the handle 16 to lower the pressing plate 18 until the pressing plate 18 presses the sheet metal part 20 down and clamps it in the fixed box 19, and then the servo motor 5 is started. The servo motor 5 can drive the rotating column 4 to rotate through the second gear 6 and the first gear 3. The rotation of the rotating column 4 can drive the rotating plate 2 to rotate, and then the servo motor 5 can drive the automobile sheet metal part 20 to be bent clamped on the upper side of the rotating plate 2 to enter the upper surface of the lower bending mold block 8; In the second step, the linear vibrator 11 is started again to make the upper bending mold block 10 vibrate at a high frequency, and the electric telescopic cylinder 13 is started to extend, so that the high-frequency vibrating upper bending mold block 10 is gradually pressed down to approach the lower bending mold block 8, so as to achieve high-frequency vibration bending of the sheet metal part 20; The third step is that during the high-frequency vibration bending process, the speed reduction detection unit and the vibration detection unit in the detection module respectively detect the descending speed, vibration frequency, amplitude, and vibration time of the upper bending mold block 10 during the bending of the sheet metal part, and form the speed reduction B, vibration frequency T, amplitude Y, and vibration time N, and transmit them to the evaluation unit for evaluation. If at least one of them exceeds the corresponding first preset threshold, judgment information is formed; The fourth step is to summarize the obtained speed reduction B, vibration frequency T, amplitude Y, and vibration time N to form the detection condition information, build a data model and optimize it, and perform regression analysis on the obtained speed reduction B, vibration frequency T, amplitude Y, and vibration time N through analysis software to obtain the influence of speed reduction B, vibration frequency T, amplitude Y, and vibration time N on the bending quality of sheet metal parts, and output the speed reduction influence factor Ab, vibration frequency influence factor At, amplitude influence factor Ay, and vibration time influence factor An; In the fifth step, the evaluation unit obtains the speed reduction B, vibration frequency T, amplitude Y, and vibration time N, and performs dimensionless processing on them, and associates them to form the control coefficient GPK. The association model is:

[0022] Among them, Ab represents the deceleration influence factor, 0.11≤Ab≤0.59; At represents the vibration frequency influence factor, 0.43≤At≤0.84; Ay represents the amplitude influence factor, 0.24≤Ay≤0.91; An represents the vibration time influence factor, 0.34≤An≤0.72; BCL represents the influence coefficient of automobile sheet metal; P represents the thickness value of automobile sheet metal; M represents the influence factor of automobile sheet metal material, among which the aluminum alloy material takes a value of 1.5, the titanium alloy material takes a value of 1.2, and the stainless steel material takes a value of 0.9; In the sixth step, the obtained control coefficient GPK is transmitted to the judgment unit for comparison with the preset second preset threshold. If the control coefficient GPK is not within the range of the second preset threshold, a corresponding control instruction is generated to control the extension speed of the electric telescopic cylinder 13 and the vibration frequency, amplitude and vibration time of the linear vibrator 11 until the control coefficient GPK is within the second preset threshold to ensure the bending quality of the automobile sheet metal.

[0023] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A bending device for automobile sheet metal parts, comprising a base plate (1), characterized in that: The upper side of the bottom plate (1) is fixedly connected to a vertical plate (21), the upper side of the vertical plate (21) is fixedly connected to a top plate (14), the bottom side wall of the top plate (14) is fixedly connected to an electric telescopic cylinder (13), the bottom end of the electric telescopic cylinder (13) is fixedly connected to a connecting plate (12), the bottom side wall of the top plate (14) is fixedly connected to a laser speed sensor (15), the bottom side wall of the connecting plate (12) is fixedly connected to a linear vibrator (11), the bottom end of the linear vibrator (11) is fixedly connected to an upper bending mold block (10), a vibration sensor (9) is provided on the side wall of the upper bending mold block (10), a lower bending mold block (8) is provided directly below the upper bending mold block (10), the bottom side wall of the lower bending mold block (8) is fixedly connected to a mounting platform (7), the mounting platform (7) is fixedly connected to the upper side of the bottom plate (1), and a rotating feeding device is provided on the upper side of the bottom plate (1); It also includes a control mechanism, which is used to control the extension speed of the electric telescopic cylinder (13), and the vibration frequency, amplitude, and vibration time of the linear vibrator (11).

2. The automobile sheet metal bending device according to claim 1, characterized in that: The rotary feeding device comprises a rotating column (4), the bottom end of which is rotatably connected to the upper side of a base plate (1) via a bearing, the upper side of the base plate (1) being fixedly connected to a servo motor (5), the upper end of which is fixedly connected to a second gear (6), the side wall of which is meshingly connected to a first gear (3), the first gear (3) being fixedly connected to the rotating column (4), the upper end of which is fixedly connected to a rotating plate (2), the rotating plate (2) being arranged in a square plate shape, the upper four sides of which are fixedly connected to a fixed box (19), the upper side of each of which is threadedly connected to a threaded rod (17), the upper end of each of which is fixedly connected to a handle (16), the bottom end of each of which is rotatably connected to a pressing plate (18), and each of which is vertically slidably connected to the fixed box (19).

3. The automobile sheet metal bending device according to claim 1, characterized in that: The control mechanism includes a control module, a detection module, and a processing module; The control module is connected to the electrical signals of the electric telescopic cylinder (13) and the linear vibrator (11); The detection module comprises a speed reduction detection unit for detecting the descending speed of the upper bending die block (10) when the automobile sheet metal part is bent, and a vibration detection unit for detecting the vibration frequency, amplitude and vibration time of the upper bending die block (10); The processing module includes an evaluation unit and a judgment unit.

4. The automobile sheet metal bending device according to claim 3, characterized in that: The speed reduction detection unit is a laser speed sensor (15), and the laser speed sensor (15) is used to obtain the descending speed of the upper bending die block (10) by detecting the descending speed of the connecting plate (12).

5. The automobile sheet metal bending device according to claim 3, characterized in that: The vibration detection unit is a vibration sensor (9), and the vibration sensor (9) is used to detect the vibration frequency, amplitude, and vibration time of the upper bending mold block (10).

6. The automobile sheet metal bending device according to claim 1, characterized in that: When the sheet metal part (20) is clamped between the bottom side of the pressing plate (18) and the inner bottom side wall of the fixed box (19), the sheet metal part (20) and the upper surface of the lower bending mold block (8) are in the same horizontal plane.

7. A method for bending an automobile sheet metal part, applied to the automobile sheet metal part bending device according to any one of claims 1 to 6, characterized in that: The bending method The following steps are involved: The first step is to first place the automobile sheet metal part (20) to be bent into the fixed box (19), then use the handle (16) to turn the threaded rod (17) to lower the pressure plate (18) until the pressure plate (18) presses the sheet metal part (20) down and clamps it in the fixed box (19), then start the servo motor (5), the servo motor (5) can drive the rotating column (4) to rotate through the second gear (6) and the first gear (3), the rotation of the rotating column (4) can drive the rotating plate (2) to rotate, and then the servo motor (5) can drive the automobile sheet metal part (20) to be bent clamped on the upper side of the rotating plate (2) to enter the upper surface of the lower bending mold block (8); In the second step, the linear vibrator (11) is started again to make the upper bending mold block (10) vibrate at a high frequency, and the electric telescopic cylinder (13) is started to extend, so that the upper bending mold block (10) vibrating at a high frequency is gradually pressed downward to approach the lower bending mold block (8), thereby achieving high-frequency vibration bending of the sheet metal part (20); In the third step, during the high-frequency vibration bending process, the speed reduction detection unit and the vibration detection unit in the detection module respectively detect the descending speed, vibration frequency, amplitude, and vibration time of the upper bending mold block (10) during the bending of the sheet metal part, thereby forming a speed reduction B, a vibration frequency T, an amplitude Y, and a vibration time N, and transmitting them to the evaluation unit for evaluation. If at least one of them exceeds a corresponding first preset threshold value, judgment information is formed; The fourth step is to summarize the obtained speed reduction B, vibration frequency T, amplitude Y, and vibration time N to form the detection condition information, build a data model and optimize it, and perform regression analysis on the obtained speed reduction B, vibration frequency T, amplitude Y, and vibration time N through analysis software to obtain the influence of speed reduction B, vibration frequency T, amplitude Y, and vibration time N on the bending quality of sheet metal parts, and output the speed reduction influence factor Ab, vibration frequency influence factor At, amplitude influence factor Ay, and vibration time influence factor An; In the fifth step, the evaluation unit obtains the speed reduction B, vibration frequency T, amplitude Y, and vibration time N, and performs dimensionless processing on them, and associates them to form the control coefficient GPK. The association model is: Among them, Ab represents the deceleration influence factor, 0.11≤Ab≤0.59; At represents the vibration frequency influence factor, 0.43≤At≤0.84; Ay represents the amplitude influence factor, 0.24≤Ay≤0.91; An represents the vibration time influence factor, 0.34≤An≤0.72; BCL represents the influence coefficient of automobile sheet metal; P represents the thickness value of automobile sheet metal; M represents the influence factor of automobile sheet metal material, among which the aluminum alloy material takes a value of 1.5, the titanium alloy material takes a value of 1.2, and the stainless steel material takes a value of 0.9; In a sixth step, the acquired control coefficient GPK is transmitted to a judgment unit for comparison with a preset second preset threshold value. If the control coefficient GPK is not within the range of the second preset threshold value, a corresponding control instruction is generated to control the extension speed of the electric telescopic cylinder (13) and the vibration frequency, amplitude, and vibration time of the linear vibrator (11) until the control coefficient GPK is within the range of the second preset threshold value.

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