Trimming machine tool with positioning structure

Abstract

The invention relates to the technical field of trimming processing, and particularly discloses a trimming processing machine tool with a positioning structure, which comprises a machine body, a supporting die and a lower pressing die are rotatably arranged on the machine body in a lifting manner, and the lowest positions of the contact parts of the supporting die and the lower pressing die with a blank are both positioned above the lowest position of a hemispherical part; a pre-positioning plate is arranged on the machine body and located below the supporting die in a lifting mode, a sleeve is further arranged on the machine body and located outside a rotating shaft of the supporting die, and at least three evenly-arranged suction cups matched with the inner wall of the hemisphere part are arranged on the peripheral wall of the sleeve. A breathable gap is reserved between the suction cup right facing the cylinder part and the cylinder part, and the suction cup right facing the hemisphere part is tightly connected with the hemisphere part. The machine body is provided with a driving mechanism used for driving the suction cup to move along an arc-shaped track in a vertical plane, and the radius of the arc-shaped track of movement of the suction cup is equal to that of the inner wall of the hemispherical part. The position of the blank is corrected through the suction cup, and the precision effect in the blank trimming process is improved.

Description

Technical Field

[0001] The present application relates to the technical field of edge trimming, and in particular to an edge trimming machine tool with a positioning structure. Background Art

[0002] A trimming machine is an industrial equipment that precisely trims or shapes the edges of materials by cutting, melting, shearing or high-frequency vibration. It is mainly used for finishing the edges of materials such as metal, wood, and plastic.

[0003] like Figure 1 A stamping blank includes a hemispherical portion, a cylindrical portion, and a skirt portion. It is commonly used as a float, a spherical ornament, or a container end cap. This type of stamping blank requires trimming before subsequent processing, removing the cylindrical portion and skirt portion while retaining the hemispherical portion. When trimming the blank, a trimming machine is typically used. The blank is first placed on a support die, and the skirt portion is positioned using a pre-positioning plate or pre-positioning clamp so that the hemispherical apex of the blank is at the highest point. The lower die is then moved downward, allowing the blank to be fixed by the support die and the lower die. The support die and the lower die are then raised or lowered so that the portion of the blank to be cut faces the cutter. The high-speed rotating cutter and the blank are then brought close together, and the blank is also rotated at high speed to cut off the boundary between the cylindrical portion and the hemispherical portion of the blank.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the following defects exist: the positioning of the blank before the lower die and the support die are fixed is only guaranteed by the pre-positioning plate or the pre-positioning clamp, and the skirt portion of the stamped blank is prone to unevenness such as warping and wavy edges. At this time, the uneven skirt portion and the pre-positioning plate will tilt, that is, the hemispherical portion will also tilt, which will cause the subsequent trimming process to tilt, affecting the processing accuracy. Summary of the Invention

[0005] In order to improve the problem of low precision during the positioning process, the present application provides a trimming machine tool with a positioning structure.

[0006] The present application provides a trimming machine tool with a positioning structure that adopts the following technical solutions: A trimming machine tool with a positioning structure comprises a machine body, a supporting die and a lower pressing die are rotatably and liftably provided on the machine body, and is characterized in that: the lowest points of the contact parts of the supporting die and the lower pressing die with the blank are both located above the lowest point of the hemispherical part, a pre-positioning plate is lifted and lowered on the machine body below the supporting die, the machine body is further provided with a sleeve outside the rotating shaft of the supporting die, the peripheral wall of the sleeve is provided with a suction cup adapted to the inner wall of the hemispherical part, and no less than three suction cups are evenly provided, and when the blank is skewed, a breathable gap is left between the suction cup facing the cylindrical part and the cylindrical part, and the suction cup facing the hemispherical part is tightly connected to the hemispherical part; The machine body is provided with a driving mechanism for driving the suction cup to move in an arc track in a vertical plane, and the radius of the arc track of the suction cup is equal to the radius of the inner wall of the hemispherical part.

[0007] By adopting the above technical solution, the blank is first placed on the supporting die, so that the skirt portion fits with the pre-positioning plate to complete the pre-positioning of the blank, and then the lower die and the pre-positioning plate are lowered, so that the lower die presses against the blank and the pre-positioning plate is separated from the contact with the blank, and then the driving mechanism drives the suction cup to move along an arc trajectory. If the blank is placed at an angle, when one of the suction cups first contacts the inclined hemispherical portion, the suction cup that first contacts the hemispherical portion is in close contact with the hemispherical portion in the process of further approaching the hemispherical portion, that is, the suction cup that is in close contact with the hemispherical portion drives the lower edge of the hemispherical portion to move upward, and then the edge of the hemispherical portion is moved upward. The higher part of the blank moves down, and the other suction cups facing the cylindrical part or the junction of the cylindrical part and the hemispherical part are adapted to the hemispherical part but not the cylindrical part. As a result, the subsequent suction cups that gradually contact the hemispherical part cannot drive the blank to move due to air leakage between them and the blank, until the suction cup that first contacts the hemispherical part moves to the specified position. At this time, the position of the blank is also corrected, and then the suction cup stops adsorption, and the lower pressing die and the supporting die further clamp the blank and drive the blank to the cutting knife height, so as to facilitate high-precision trimming of the blank. Due to the short length of the cylindrical part, the actual adjustment process is short and the whole process processing speed is fast.

[0008] Optionally, the driving mechanism includes an arc-shaped slide rail fixedly connected to the sleeve, an arc-shaped slider slidably connected to the arc-shaped slide rail, a driving rod lifted and lowered on the body, and a lifting assembly for driving the driving rod to lift and lower in a vertical direction. The suction cup is fixedly connected to the arc-shaped slider, and the suction cup is slidably connected to the driving rod in a horizontal direction.

[0009] By adopting the above technical solution, when the suction cup pushes the blank to move, the lifting assembly controls the driving rod to lift and lower in the vertical direction, and cooperates with the limiting effect of the arc slide rail and the arc slider, so that the driving rod drives the suction cup to move along the arc slide rail, and the moving trajectory of the suction cup is adapted to the inner wall of the hemispherical part.

[0010] Optionally, the lifting assembly includes a fixed frame fixed to the sleeve, a lifting rack arranged on the top of the pre-positioning plate, a reversing gear rotatably connected to the fixed frame, and a driving rack slidably connected to the fixed frame, the reversing gear is meshed with the lifting rack and the driving rack, and the machine body is also provided with a deceleration connection assembly for connecting the driving rack and the driving rod.

[0011] By adopting the above technical solution, when the pre-positioning plate descends, the lifting rack also descends, and the lifting rack drives the driving gear to rise through the reversing gear, and then drives the driving rod to move upward through the reduction connection assembly. In this process, the reduction connection assembly reduces the moving stroke of the driving rod, that is, the small moving stroke of the driving rod is driven by the large moving stroke of the pre-positioning plate, thereby improving the moving accuracy of the driving rod, and the drive of the driving rod does not require additional power sources, thereby improving the integration of this application and reducing the cost of software and hardware.

[0012] Optionally, the speed reduction connection assembly includes a fixed rack fixed to the fixed frame and a driving gear rotatably connected to the driving rod, and the driving gear is also meshed with the driving rack and the fixed rack.

[0013] By adopting the above technical solution, since the fixed rack is fixed to the fixed frame and the driving gear is engaged with the fixed rack and the driving rack at the same time, when the driving rack rises, the driving gear also rises and rotates, that is, the stroke of the driving rod in the vertical direction is the stroke of the driving gear in the vertical direction, and the stroke of the driving gear in the vertical direction is equal to the stroke of the driving rack minus the stroke of the driving gear rotation, thereby reducing the error caused by the error in the movement of the driving gear due to the error in the movement of the pre-positioning plate.

[0014] Optionally, the sleeve is rotatably connected to the body, the lifting rack is slidably connected to the pre-positioning plate, a motor is fixedly connected to the body and is transmission-connected to the sleeve, pressure sensors are respectively provided at both ends of the bottom of the suction cup, and the pressure sensors are electrically connected to the motor.

[0015] By adopting the above technical solution, after the blank is placed on the support mold, the position of the suction cup is indirectly judged by the pressure received by the pressure sensor, and the motor drives the sleeve to rotate until the pressures received by the two pressure sensors on one of the suction cups are equal. That is, at this time, the suction cup with equal pressure from the two pressure sensors is facing the side of the blank that is tilted toward the lowest direction, thereby making the subsequent suction cup more accurate in driving the blank to correct its position.

[0016] Optionally, the bottom of the suction cup and one end close to the blank is in the shape of a curved strip.

[0017] By adopting the above technical solution, after the suction cup has positioned the blank, the suction cup stops applying suction to the blank, the lower pressing die and the supporting die move upward, so that the part of the blank to be cut is facing the cutter, and the suction cup moves to the cylindrical part. At this time, the bottom of the suction cup supports the cylindrical part of the blank. When the cutter starts the cutting operation, the rotation speed of the sleeve and the blank is equal, that is, the hemispherical part of the blank is supported by the supporting die and the cylindrical part of the blank is supported by the suction cup, thereby reducing the shaking amplitude of the cylindrical part during the trimming operation and improving the stability and accuracy of the trimming operation.

[0018] Optionally, a magnetorheological damper is provided between the machine body and the lower die.

[0019] By adopting the above technical solution, during the process of positioning and adjusting the blank by the suction cup, the magnetorheological damper becomes soft, so that there is a certain buffer between the lower die and the blank, reducing the pressure of the lower die on the blank, and thus reducing the friction force of the lower die and the supporting die on the blank; when the suction cup has completed adjusting the position of the blank, the magnetorheological damper becomes hardened, so that the lower die and the supporting die can form a more stable clamping position for the blank and avoid slipping, offset and other phenomena of the blank during the trimming operation.

[0020] A method for using a trimming machine tool with a positioning structure comprises the following steps: S1. Preliminary positioning of the blank: Place the blank on the supporting die so that the skirt part abuts against the pre-positioning plate; S2. Adjust the position of the blank: move the lower die and the pre-positioning plate downward to make the lower die fit the blank. The suction cup drives the blank to move and align the blank position. S3. Fix the position of the blank: move the lower pressing die and the supporting die upwards so that the position of the blank to be cut is aligned with the cutter position, and the suction cup is aligned with and supports the cylindrical part; S4, trimming operation: the supporting die and the suction cup rotate synchronously, and the cutter moves to the junction of the cylindrical part and the hemispherical part of the blank and rotates.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The pre-positioning plate first performs preliminary positioning of the blank to prevent it from being excessively skewed after being placed on the support die. The pre-positioning plate then moves downward to drive the suction cup upward, allowing the position of the blank to be adjusted by the power of the pre-positioning plate. This process only requires the power source of the pre-positioning plate, is low-cost, and takes a short adjustment time. 2. Since the fixed rack is fixed to the fixed frame and the driving gear meshes with both the fixed rack and the driving rack, when the driving rack rises, the driving gear also rises and rotates. That is, the vertical travel of the driving rod is equal to the vertical travel of the driving gear, and the vertical travel of the driving gear is equal to the travel of the driving rack minus the travel of the driving gear's rotation. This reduces the error in the movement of the driving gear caused by the error in the movement of the pre-positioning plate. 3. After the blank is placed on the support die, the position of the suction cup is indirectly determined by the pressure received by the pressure sensor. The motor drives the sleeve to rotate until the pressure received by the two pressure sensors on one of the suction cups is equal. That is, the suction cup with equal pressure from the two pressure sensors is facing the lowest tilted side of the blank, which makes the subsequent suction cup more accurate when driving the blank to correct its position. 4. As the suction cup adjusts the blank's positioning, the magnetorheological damper softens, creating a certain buffer between the lower die and the blank, reducing the pressure exerted by the lower die on the blank, and thereby reducing the friction between the lower die and the supporting die on the blank. When the suction cup has completed adjusting the blank's position, the magnetorheological damper hardens, allowing the lower die and the supporting die to more firmly clamp the blank and prevent slipping and deflection of the blank during trimming. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the blank structure of an embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the present application after the blank is hidden and the die is pressed down; Figure 4 yes Figure 3 A magnified schematic diagram of part A; Figure 5 This application is mainly used to show the structural diagram of the suction cup, driving mechanism and pressure sensor.

[0024] Figure numerals: 1. Body; 11. Support mold; 12. Lower pressure mold; 13. Pre-positioning plate; 2. Sleeve; 3. Suction cup; 4. Driving mechanism; 41. Arc slide rail; 42. Driving rod; 43. Lifting assembly; 431. Fixed frame; 432. Lifting rack; 433. Reversing gear; 434. Driving rack; 5. Speed ​​reduction connection assembly; 51. Fixed rack; 52. Driving gear; 61. Motor; 62. Pressure sensor; 7. Magnetorheological damper; 8. Blank; 81. Hemispherical part; 82. Cylindrical part; 83. Skirt part. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-5 This application is described in further detail.

[0026] Example 1

[0027] The embodiment of the present application discloses a trimming machine tool with a positioning structure. Figure 1-4 The trimming machine tool with a positioning structure includes a machine body 1, on which a support die 11 and a lower die 12 are rotatably arranged. The lowest points of the contact parts of the support die 11 and the lower die 12 with the blank 8 are both located above the lowest point of the hemispherical part 81, so that there is cutting space when the cutter performs trimming. A pre-positioning plate 13 or a pre-positioning clamp is lifted and lowered on the machine body 1 below the support die 11. If it is a pre-positioning clamp, it is connected to the machine body 1 through a two-axis movable platform that can be adjusted in the horizontal and vertical directions. The present application is a pre-positioning plate 13, and the pre-positioning plate 13 is connected to the machine body 1 through a cylinder to reduce the cost of the pre-positioning step.

[0028] The body 1 is further provided with a sleeve 2 outside the rotating shaft of the supporting mold 11, and the peripheral wall of the sleeve 2 is provided with a suction cup 3 adapted to the inner wall of the hemispherical portion 81. The suction cup 3 is evenly provided with no less than three. In this application, four suction cups 3 are evenly provided. When the blank 8 is skewed, a breathable gap is left between the suction cup 3 facing the cylindrical portion 82 and the cylindrical portion 82, and the suction cup 3 facing the hemispherical portion 81 is tightly connected to the hemispherical portion 81; the body 1 is provided with a device for driving the suction cup 3 to vertically The driving mechanism 4 moves in an arc trajectory in a plane (for the convenience of understanding and display, the proportions between the various lower characteristic structures of the driving mechanism 4 in the drawings of the specification are different from the actual ones), and the radius of the arc trajectory of the movement of the suction cup 3 is equal to the radius of the inner wall of the hemispherical portion 81. The end of the suction cup 3 close to the blank 8 can be made of a hard material such as metal or plastic to ensure that the suction cup 3 will only generate a large suction force on the blank 8 when the suction cup 3 is in contact with the blank 8. Otherwise, gaps are likely to appear and air leaks are likely to occur.

[0029] First, place the blank 8 on the supporting die 11 so that the skirt portion 83 fits with the pre-positioning plate 13 to complete the pre-positioning of the blank 8. Then lower the lower die 12 and the pre-positioning plate 13 so that the lower die 12 presses against the blank 8 and the pre-positioning plate 13 is out of contact with the blank 8. Then drive the mechanism 4 to drive the suction cup 3 to move along the arc trajectory. If the blank 8 is placed at an angle, when one of the suction cups 3 first contacts the inclined hemispherical portion 81, the suction cup 3 that first contacts the hemispherical portion 81 is in close contact with the hemispherical portion 81 as it approaches the hemispherical portion 81, that is, the suction cup 3 that is in close contact with the hemispherical portion 81 drives the lower part of the edge of the hemispherical portion 81 to move upward, and the higher part of the edge of the hemispherical portion 81 moves downward. The other suction cups 3 facing the cylindrical portion 82 or at the junction of the cylindrical portion 82 and the hemispherical portion 81, because the suction cups 3 are adapted to the hemispherical portion 81 but not to the cylindrical portion 82, thereby causing the subsequent suction cups 3 that gradually contact the hemispherical portion 81 to be in close contact with the blank 8. There is air leakage and the blank 8 cannot be moved until the suction cup 3 that first contacts the hemispherical part 81 moves to the specified position. At this time, the position of the blank 8 is corrected. Although the suction cup 3 at the lower position of the blank will be affected by the suction cup 3 at the higher position of the blank 8 and produce a certain error, the position of the blank 8 is within the error range at this time, and then the suction cup 3 stops adsorption, the lower pressing die 12 and the supporting die 11 further clamp the blank 8 and drive the blank 8 to move to the cutting knife height, so as to facilitate high-precision trimming of the blank 8. Since the length of the cylindrical part 82 is relatively short, the actual adjustment process takes a shorter time and the entire process processing speed is faster.

[0030] Reference Figure 4 and Figure 5 The driving mechanism 4 includes an arc-shaped slide rail 41 fixed to the sleeve 2, an arc-shaped slider 44 slidably connected to the arc-shaped slide rail 41, a driving rod 42 lifted and lowered on the body 1, and a lifting assembly 43 for driving the driving rod 42 to lift and lower in the vertical direction. The suction cup 3 is fixed to the arc-shaped slider 44, and the suction cup 3 is slidably connected to the driving rod 42 in the horizontal direction. The lifting assembly 43 includes a fixed frame 431 fixed to the sleeve 2, a lifting rack 432 set on the top of the pre-positioning plate 13, a reversing gear 433 rotatably connected to the fixed frame 431, and a driving rack 434 slidably connected to the fixed frame 431. The reversing gear 433 is meshed with the lifting rack 432 and the driving rack 434. The body 1 is also provided with a deceleration connection assembly 5 for connecting the driving rack 434 and the driving rod 42.

[0031] When the suction cup 3 pushes the blank 8 to move, the lifting assembly 43 controls the driving rod 42 to move up and down in the vertical direction, and the driving rod 42 drives the suction cup 3 to move along the arc-shaped slide rail 41, and the movement trajectory of the suction cup 3 is adapted to the inner wall of the hemispherical portion 81, wherein the driving rod 42 is also connected to the fixed frame 431 in a sliding manner in the vertical direction. When the pre-positioning plate 13 descends, the lifting rack 432 also descends, and the lifting rack 432 drives the driving gear 52 to rise through the reversing gear 433, and then drives the driving rod 42 to move upward through the reduction connection assembly 5. In this process, the reduction connection assembly 5 reduces the movement stroke of the driving rod 42, that is, the small movement stroke of the driving rod 42 is driven by the large movement stroke of the pre-positioning plate 13, thereby improving the movement accuracy of the driving rod 42, and the drive of the driving rod 42 does not require additional power sources, thereby improving the integration of the present application and reducing the cost of software and hardware.

[0032] Reference Figure 4 The reduction connection assembly 5 includes a fixed rack 51 fixed to the fixed frame 431 and a driving gear 52 rotatably connected to the driving rod 42. The driving gear 52 is also meshed with the driving rack 434 and the fixed rack 51. The end of the driving rod 42 away from the suction cup 3 is slidably connected to the sleeve 2 in the vertical direction, so that the driving rod 42 can only move in the vertical direction and cannot tilt.

[0033] Since the fixed rack 51 is fixed to the fixed frame 431 and the driving gear 52 is engaged with the fixed rack 51 and the driving rack 434 at the same time, when the driving rack 434 rises, the driving gear 52 also rises and rotates, that is, the stroke of the driving rod 42 moving in the vertical direction is the stroke of the driving gear 52 moving in the vertical direction, and the stroke of the driving gear 52 in the vertical direction is equal to the stroke of the driving rack 434 minus the stroke of the driving gear 52 rotating, thereby reducing the error caused by the error in the movement of the driving gear 52 due to the error in the movement of the pre-positioning plate 13.

[0034] In other feasible embodiments, the deceleration connection assembly 5 can also be a pneumatic cylinder. However, due to the relatively small space below the pre-positioning plate 13, a cylinder also requires an additional transmission structure to facilitate the movement of the multiple suction cups 3, and the hardware and software costs of the cylinder are higher. To further simplify the structure, the deceleration connection assembly 5 can also be omitted, and the drive rod can be directly connected to the lifting rack 432. However, this will further reduce accuracy. The specific installation can be selectively configured based on the actual billet size, accuracy requirements, and other working conditions.

[0035] Reference Figure 5The sleeve 2 is rotatably connected to the machine body 1, and the lifting rack 432 is slidably connected to the pre-positioning plate 13. A motor 61 is fixed to the machine body 1 and is transmission-connected to the sleeve 2. Pressure sensors 62 are respectively provided at both ends of the bottom of the suction cup 3, and the pressure sensors 62 are electrically connected to the motor 61. After the blank 8 is placed on the supporting die 11, the position of the suction cup 3 is indirectly judged by the pressure received by the pressure sensor 62. The motor 61 drives the sleeve 2 to rotate until the pressures received by the two pressure sensors 62 on one of the suction cups 3 are equal. That is, at this time, the suction cup 3 with equal pressures from the two pressure sensors 62 is facing the side of the blank 8 that is tilted to the lowest direction, thereby making the subsequent suction cup 3 drive the blank 8 to correct its position more accurately. In addition, the pressure sensor 62 is used to control only the suction cup 3 located on the lowest side of the blank 8 to operate, while the suction cups 3 at other positions stop ventilating, thereby further improving the accuracy of the blank 8 position correction.

[0036] Reference Figure 5 The bottom of the suction cup 3 and one end close to the blank 8 are in the shape of a curved strip. When the suction cup 3 has completed positioning the blank 8, the suction cup 3 stops applying suction to the blank 8, the lower pressing die 12 and the supporting die 11 move up, so that the part of the blank 8 to be cut is facing the cutter, and the suction cup 3 moves to the cylindrical part 82. At this time, the bottom of the suction cup 3 supports the cylindrical part 82 of the blank 8. When the cutter starts the cutting operation, the rotation speed of the sleeve 2 and the blank 8 is equal, that is, the hemispherical part 81 of the blank 8 is supported by the supporting die 11, and the cylindrical part 82 of the blank 8 is supported by the suction cup 3, which reduces the shaking amplitude of the cylindrical part 82 during the trimming operation and improves the stability and accuracy of the trimming operation.

[0037] Reference Figure 2 and Figure 3 The lower die 12 is connected to the machine body 1 through a rotating shaft. A hydraulic cylinder is also fixedly connected to the machine body 1. A connecting block is provided at the output shaft end of the hydraulic cylinder. The rotating shaft is rotatably connected to the connecting block. A magnetorheological damper 7 is fixedly connected between the output end of the hydraulic cylinder and the connecting block. The magnetorheological damper 7 can also be replaced by a spring damper or a hydraulic damper. However, when it is necessary to increase the pressure of the lower die 12 on the blank 8, the machine body 1 needs to act on the lower die 12 with a larger downward stroke and downward force, and the effect is not as good as the magnetorheological damper 7. During the process of positioning and adjusting the blank 8 by the suction cup 3, the magnetorheological damper 7 becomes soft, so that there is a certain buffer between the lower die 12 and the blank 8, reducing the pressure of the lower die 12 on the blank 8, and thereby reducing the friction force of the lower die 12 and the support die 11 on the blank 8; when the suction cup 3 has completed the position adjustment of the blank 8, the magnetorheological damper 7 becomes hard, so that the lower die 12 and the support die 11 can form a more stable clamping and positioning of the blank 8, and avoid slipping, deviation, etc. of the blank 8 during the trimming operation.

[0038] The implementation principle of the trimming processing machine tool with a positioning structure in the embodiment of the present application is as follows: first, the blank 8 is placed on the supporting die 11, so that the skirt portion 83 is fitted with the pre-positioning plate 13 to complete the pre-positioning of the blank 8, and then the lower pressing die 12 and the pre-positioning plate 13 are lowered, so that the lower pressing die 12 is pressed against the blank 8 and the pre-positioning plate 13 is separated from the contact with the blank 8. During the descending process of the pre-positioning plate 13, the lifting rack 432 is driven to descend, so that the driving rack 434 is reversed through the reversing gear 433, and then the driving gear 52 is raised accordingly through the speed reduction connection assembly 5, thereby moving the suction cup 3 along the arc trajectory and adjusting the magnetorheological damper 7 to soften. If the blank 8 is placed at an angle, when one of the suction cups 3 first contacts the inclined hemispherical portion 81, the suction cup 3 that first contacts the hemispherical portion 81 is in close contact with the hemispherical portion 81 in the process of getting closer to the hemispherical portion 81, that is, the suction cup 3 that is in close contact with the hemispherical portion 81 drives the lower part of the edge of the hemispherical portion 81 to move upward, and the higher part of the edge of the hemispherical portion 81 moves downward. The other suction cups 3 facing the cylindrical portion 82 or at the junction of the cylindrical portion 82 and the hemispherical portion 81 are adapted to the hemispherical portion 81 but not to the cylindrical portion 82, so that the subsequent suction cups 3 that gradually contact the hemispherical portion 81 cannot drive the blank 8 to move due to air leakage between them, until the suction cup 3 that first contacts the hemispherical portion 81 moves to the specified position, at which time the position of the blank 8 is also corrected; Then the suction cup 3 stops sucking the blank 8, the lower pressing die 12 and the supporting die 11 further clamp the blank 8 and drive the blank 8 to move up to the cutting knife height. At this time, the suction cup 3 supports the cylindrical part 82 to facilitate stable and high-precision trimming of the blank 8.

[0039] Example 2

[0040] The present application discloses a method for using a trimming machine tool having a positioning structure, comprising the following steps: S1. Preliminary positioning of the blank 8: Place the blank 8 on the supporting die 11 so that the skirt portion 83 abuts against the pre-positioning plate 13; S2. Adjust the position of the blank 8: Move the lower die 12 and the pre-positioning plate 13 downward to fit the lower die 12 and the blank 8. The suction cup 3 drives the blank 8 to move and align the blank 8; S3, the position of the blank 8 is fixed: the lower pressing die 12 and the supporting die 11 are moved upward, so that the position of the blank 8 to be cut is aligned with the cutter position, and the suction cup 3 is aligned with and supports the cylindrical portion 82; S4, trimming operation: the supporting die 11 and the suction cup 3 rotate synchronously, and the cutter moves to the junction of the cylindrical portion 82 and the hemispherical portion 81 of the blank 8 and rotates.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A trimming machine tool with a positioning structure, comprising a machine body (1), wherein a supporting die (11) and a lower pressing die (12) are provided on the machine body (1) for rotation and lifting, and characterized in that: The lowest points of the contact parts of the supporting die (11) and the lower pressing die (12) with the blank (8) are both located above the lowest point of the hemispherical portion (81); a pre-positioning plate (13) is provided on the machine body (1) below the supporting die (11) for lifting; a sleeve (2) is further provided on the machine body (1) outside the rotating shaft of the supporting die (11); a suction cup (3) adapted to the inner wall of the hemispherical portion (81) is provided on the peripheral wall of the sleeve (2); and no less than three suction cups (3) are evenly provided. When the blank (8) is skewed, an air-permeable gap is left between the suction cup (3) facing the cylindrical portion (82) and the cylindrical portion (82), and the suction cup (3) facing the hemispherical portion (81) is tightly connected to the hemispherical portion (81); The machine body (1) is provided with a driving mechanism (4) for driving the suction cup (3) to move along an arc track in a vertical plane, and the radius of the arc track along which the suction cup (3) moves is equal to the radius of the inner wall of the hemispherical portion (81).

2. The trimming machine tool with a positioning structure according to claim 1, characterized in that: The driving mechanism (4) includes an arc-shaped slide rail (41) fixedly connected to the sleeve (2), an arc-shaped slider (44) slidably connected to the arc-shaped slide rail (41), a driving rod (42) lifted and lowered on the body (1), and a lifting assembly (43) for driving the driving rod (42) to rise and fall in a vertical direction. The suction cup (3) is fixedly connected to the arc-shaped slider (44), and the suction cup (3) is slidably connected to the driving rod (42) in a horizontal direction.

3. The trimming machine tool with a positioning structure according to claim 2, characterized in that: The lifting assembly (43) includes a fixed frame (431) fixed to the sleeve (2), a lifting rack (432) arranged on the top of the pre-positioning plate (13), a reversing gear (433) rotatably connected to the fixed frame (431), and a driving rack (434) slidably connected to the fixed frame (431), the reversing gear (433) is meshed and connected with the lifting rack (432) and the driving rack (434), and the body (1) is also provided with a speed reduction connection assembly (5) for connecting the driving rack (434) and the driving rod (42).

4. The trimming machine tool with a positioning structure according to claim 3, characterized in that: The speed reduction connection assembly (5) includes a fixed rack (51) fixedly connected to the fixed frame (431) and a driving gear (52) rotatably connected to the driving rod (42), and the driving gear (52) is also meshed with the driving rack (434) and the fixed rack (51).

5. The trimming machine tool with a positioning structure according to claim 3, characterized in that: The sleeve (2) is rotatably connected to the body (1), the lifting rack (432) is slidably connected to the pre-positioning plate (13), a motor (61) is fixed to the body (1) and is transmission-connected to the sleeve (2), and pressure sensors (62) are respectively provided at both ends of the bottom of the suction cup (3), and the pressure sensors (62) are electrically connected to the motor (61).

6. The trimming machine tool with a positioning structure according to claim 5, characterized in that: The bottom of the suction cup (3) and one end close to the blank (8) is in the shape of a curved strip.

7. The trimming machine tool with a positioning structure according to claim 1, characterized in that: A magnetorheological damper (7) is provided between the machine body (1) and the lower pressing die (12).

8. A method for using a trimming machine tool with a positioning structure, according to any one of claims 1 to 7, characterized in that: The steps include: S1. Preliminary positioning of the blank (8): placing the blank (8) on the supporting die (11) so that the skirt portion (83) abuts against the pre-positioning plate (13); S2, adjusting the position of the blank (8): moving the lower die (12) and the pre-positioning plate (13) downward so that the lower die (12) and the blank (8) are in contact with each other, and the suction cup (3) drives the blank (8) to move so that the position of the blank (8) is corrected; S3, the position of the blank (8) is fixed: the lower pressing die (12) and the supporting die (11) are moved upward, so that the position of the blank (8) to be cut is aligned with the cutter position, and the suction cup (3) is aligned with and supports the cylindrical portion (82); S4, trimming operation: the supporting die (11) and the suction cup (3) rotate synchronously, and the cutter moves to the junction of the cylindrical portion (82) and the hemispherical portion (81) of the blank (8) and rotates.

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