A single-motor dual-axis synchronous forming machine

Abstract

The present invention relates to the field of metal forming technology, and specifically discloses a single-motor dual-axis synchronous forming machine, including a spindle box and a reduction motor, wherein an upper spindle and a lower spindle are arranged in the spindle box, an upper mold is arranged at the end of the upper spindle, and a lower mold is arranged at the end of the lower spindle to cooperate with the upper mold, and a synchronization mechanism is connected to the output shaft of the reduction motor, and the synchronization mechanism drives the upper spindle and the lower spindle to rotate through a transmission component; in the no-load stage, the upper spindle drives the lower spindle to rotate to achieve angular velocity synchronization; in the workpiece clamping stage, the upper mold drives the lower mold to rotate to achieve linear velocity synchronization; a single motor drive is used to simplify the power structure and reduce equipment cost; in the no-load stage, the upper spindle and the lower spindle maintain the same angular velocity, reducing the resistance of the upper spindle to drag the lower spindle to rotate; in the clamping stage, the problem of motor stalling and workpiece damage caused by increased relative resistance is avoided; by dynamically switching angular velocity synchronization and linear velocity synchronization, processing safety, precision and stability are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of metal forming, in particular to a single-motor dual-axis synchronous forming machine. Background Art

[0002] A roll forming machine is a special equipment that continuously cold presses metal sheets through rollers. It is mainly used for processing metal parts in the fields of automobile wheels, construction materials, etc.

[0003] In the field of double-sided symmetrical forming of metal workpieces, traditional biaxial forming machines usually adopt the following two synchronization methods:

[0004] Dual-motor synchronization: Independent motors drive the upper and lower spindles, respectively, relying on high-precision encoders and closed-loop control systems for speed matching. However, this solution is complex and costly, and is prone to response delays under high loads or sudden speed changes. This can lead to asynchronous linear speeds between the upper and lower molds, resulting in surface scratches and uneven thickness on the workpiece. Over long-term operation, accumulated errors in the servo system can affect molding accuracy and even cause mold collisions.

[0005] Single-motor solution: For example, the forming unit of the door frame forming machine disclosed in patent CN108787931A uses a single motor to drive the active shaft, which directly drives the passive shaft through friction. However, since the passive shaft does not have its own power and relies entirely on the active shaft for rotation through friction, the relative resistance between the active and passive shafts is relatively large, which can easily lead to problems such as motor stalling and workpiece damage. Summary of the Invention

[0006] The present invention is aimed at the above-mentioned deficiencies in the prior art and provides a single-motor dual-axis synchronous forming machine. It adopts a single-motor drive to simplify the power structure, reduces energy consumption compared with the dual-motor solution, reduces electrical failure points, and reduces equipment costs. During the clamping stage, it can achieve consistency in the linear speeds of the upper and lower molds, effectively avoiding the problems of motor stalling and workpiece damage caused by increased relative resistance when the upper and lower molds rotate relative to each other. By dynamically switching angular velocity synchronization and linear speed synchronization, processing safety, precision and stability are ensured.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A single-motor, dual-axis synchronous forming machine includes a spindle box and a reduction motor. An upper spindle and a lower spindle are provided in the spindle box. An upper mold is provided at the end of the upper spindle, and a lower mold that cooperates with the upper mold is provided at the end of the lower spindle. A synchronization mechanism is connected to the output shaft of the reduction motor, and the synchronization mechanism drives the upper and lower spindles to rotate through transmission components; in the no-load stage, the upper spindle drives the lower spindle to rotate to achieve angular velocity synchronization; in the workpiece clamping stage, the upper mold drives the lower mold to rotate to achieve linear velocity synchronization.

[0009] Preferably, the synchronization mechanism includes a gearbox, in which a parallel upper transmission shaft and a lower transmission shaft are provided, and the transmission component includes a universal coupling, one end of the upper transmission shaft is connected to the output shaft of the reduction motor through a coupling, and the other end of the upper transmission shaft is connected to the upper main shaft through a universal coupling, the outer side of the upper transmission shaft is covered with an upper gear, one end of the lower transmission shaft is connected to the lower main shaft through a universal coupling, the outer side of the lower transmission shaft is covered with a lower gear meshing with the upper gear, an overrunning clutch is provided between the lower gear and the lower transmission shaft, and the outer side of the universal coupling is covered with a protective box.

[0010] Preferably, an upper shaft sleeve is sleeved on the outer side of the upper spindle, the upper end of the upper shaft sleeve is connected to the spindle box through a pull rod, a first side shaft sleeve is connected to the side wall of the upper shaft sleeve, and an upper rotating shaft connected to the spindle box is arranged in the first side shaft sleeve.

[0011] Preferably, a lower shaft sleeve is sleeved on the outer side of the lower main shaft, an oil cylinder is connected between the bottom of the lower shaft sleeve and the main shaft box, a second side shaft sleeve is connected to the side wall of the lower shaft sleeve, and a lower rotating shaft connected to the main shaft box is arranged in the second side shaft sleeve.

[0012] Preferably, one end of the upper rotating shaft and the lower rotating shaft are connected to the main spindle box through a pin shaft, and the other end of the upper rotating shaft and the lower rotating shaft are inserted into the adjustment box on the side wall of the main spindle box. The upper rotating shaft and the lower rotating shaft can slide up and down in the adjustment box. The upper and lower ends of the adjustment box are provided with adjustment bolts for tightening the upper rotating shaft and the lower rotating shaft, and the side wall of the adjustment box is provided with locking bolts for fixing the upper rotating shaft and the lower rotating shaft.

[0013] Preferably, a limit block is provided on the side wall of the lower sleeve, and a first limit screw matched with the limit block is provided on the inner wall of the spindle box.

[0014] Preferably, the end of the lower sleeve away from the lower mold is connected to a measuring plate through a connecting rod, a vertical guide rail is provided on the side wall of the spindle box, the measuring plate cooperates with the guide rail through a slider, and a displacement sensor for cooperating with the measuring plate is provided on one side of the guide rail.

[0015] Preferably, both sides of the upper mold are provided with guide mechanisms connected to the spindle box, and a fixed seat is provided on the side wall of the spindle box. The guide mechanism includes a support seat, and the support seat is connected to the fixed seat through a fixed plate. A cylinder and a guide tube are provided in the support seat, and a pressure rod is connected to the piston rod of the cylinder, and both ends of the pressure rod are connected to guide rods passing through the guide tube, and the lower end of the guide rod is connected to a guide wheel seat, and the bottom of the guide wheel seat is connected to a guide wheel for positioning the workpiece.

[0016] Preferably, the fixing plate is provided with an arc-shaped connecting hole, the fixing seat fixes the fixing plate by a positioning bolt matched with the connecting hole, and the fixing seat is connected to a second limiting screw that supports the support seat.

[0017] Preferably, a third limiting screw that contacts and cooperates with the upper end of the support seat is connected to the side wall of the pressure rod, a proximity switch is connected to the side wall of the support seat through a fixing plate, and a detection piece that cooperates with the proximity switch is provided on the pressure rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention adopts a single-motor drive to simplify the power structure, which reduces energy consumption compared with the dual-motor solution, reduces electrical failure points, and reduces equipment costs; in the no-load stage, the upper and lower spindles maintain the same angular velocity, so that the lower spindle has an initial rotation velocity, effectively reducing the resistance of the upper spindle to drag the lower spindle to rotate; in the clamping stage, the consistency of the linear speeds of the upper and lower molds can be achieved, effectively avoiding the problem of motor stalling and workpiece damage caused by the increase in relative resistance when the upper and lower molds rotate relative to each other; by dynamically switching angular velocity synchronization and linear velocity synchronization, processing safety, precision and stability are ensured.

[0020] 2. The present invention can accurately compensate for the angular deviation of the upper / lower spindle caused by gravity drop through the bidirectional adjustment bolts in the adjustment box, ensuring consistent distance between the far ends of the mold, solving the industry pain point of "one side thick, one side thin" of the workpiece, and ensuring uniformity of processing thickness.

[0021] 3. The present invention positions the workpiece through the guide wheel to prevent the workpiece from deviating during the forming process and improve the processing accuracy; the second limiting screw resists the workpiece support force to prevent the support seat from moving and improve the positioning rigidity.

[0022] 4. The present invention uses a displacement sensor to detect the displacement of the measuring plate in real time, controls the two-stage lifting of the oil cylinder (fast approach → slow fitting), shortens the loading cycle, and avoids impact damage to the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 is a cross-sectional view of the present invention;

[0025] Figure 3 Schematic diagram of the structure of the upper spindle;

[0026] Figure 4 Schematic diagram of the structure of the lower spindle;

[0027] Figure 5 This is the right schematic diagram of the spindle box;

[0028] Figure 6 A top view of the spindle box;

[0029] Figure 7 Schematic diagram of the structure of the guide mechanism;

[0030] Figure 8 The main view of the guide mechanism;

[0031] Figure 9 It is a left side view of the present invention;

[0032] In the figure: 1- bracket; 2- reduction motor; 3- synchronization mechanism; 301- gear box; 302- upper gear; 303- upper transmission shaft; 304- lower gear; 305- lower transmission shaft; 306- overrunning clutch; 4- transmission components; 401- protection box; 402- universal coupling; 5- spindle box; 501- adjustment box; 502- adjustment bolt; 503- locking bolt; 504- first limit screw; 505- displacement sensor; 506- slider; 507- guide rail; 508- fixed seat; 509- positioning bolt; 510- second limit screw; 6- guide mechanism; 601- support seat; 60 2-fixed plate; 603-connecting hole; 604-guide rod; 605-pressure rod; 606-third limit screw; 607-guide cylinder; 608-guide wheel seat; 609-guide wheel; 610-fixed plate; 611-proximity switch; 612-detection piece; 613-cylinder; 7-upper spindle; 701-upper mold; 702-pull rod; 703-upper sleeve; 704-first side sleeve; 705-upper rotating shaft; 8-lower spindle; 801-lower mold; 802-lower sleeve; 803-limit block; 804-second side sleeve; 805-lower rotating shaft; 806-connecting rod; 807-measuring plate; 9-oil cylinder. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, a single-motor dual-axis synchronous forming machine includes a spindle box 5 and a reduction motor 2. The bottom of the reduction motor 2 is supported by a bracket 1. An upper spindle 7 and a lower spindle 8 are provided in the spindle box 5. An upper mold 701 is provided at the end of the upper spindle 7, and a lower mold 801 is provided at the end of the lower spindle 8 to cooperate with the upper mold 701. A synchronization mechanism 3 is connected to the output shaft of the reduction motor 2, and the synchronization mechanism 3 drives the upper spindle 7 and the lower spindle 8 to rotate through a transmission component 4; in the no-load stage (before the upper mold 701 contacts the workpiece): the upper spindle 7 drives the lower spindle 8 to rotate to achieve angular velocity synchronization; in the clamping stage: the upper mold 701 and the lower mold 801 clamp the workpiece to achieve linear velocity synchronization.

[0035] like Figure 2 As shown, the synchronization mechanism 3 includes a gear box 301, in which a parallel upper transmission shaft 303 and a lower transmission shaft 305 are provided. The transmission component 4 includes a universal coupling 402. One end of the upper transmission shaft 303 and the lower transmission shaft 305 are connected to the upper main shaft 7 through the universal coupling 402. The outer side of the universal coupling 402 is covered with a protective box 401; the other end of the upper transmission shaft 303 is connected to the reduction motor 2 through a coupling, and both ends of the upper transmission shaft 303 and the lower transmission shaft 305 are matched with the gear box 301 through bearings. The transmission between the upper transmission shaft 303 and the lower transmission shaft 305 can be of various types: for example, an upper gear 302 is sheathed on the outer side of the upper transmission shaft 303, a lower gear 304 meshing with the upper gear 302 is sheathed on the outer side of the lower transmission shaft 305, and an overrunning clutch 306 is provided between the lower gear 304 and the lower transmission shaft 305; or another example, an upper pulley is sheathed on the upper transmission shaft 303, a lower pulley is sheathed on the lower transmission shaft 305, the upper pulley and the lower pulley are driven by a belt, and an overrunning clutch 306 is provided between the lower pulley and the lower transmission shaft 305. When the speed of the lower transmission shaft 305 is slower than that of the upper transmission shaft 303, the overrunning clutch 306 engages and transmits power; when the speed of the lower transmission shaft 305 exceeds that of the upper transmission shaft 303, the overrunning clutch 306 automatically disengages, cutting off the power transmission between the upper transmission shaft 303 and the lower transmission shaft 305.

[0036] By means of the overrunning clutch 306 , the lower transmission shaft 305 is able to “overtake” the rotation speed of the upper transmission shaft 303 without being restricted by the upper transmission shaft 303 . That is, when the reduction motor 2 just starts to run, the upper spindle 7 and the lower spindle 8 have not yet clamped the workpiece, but the upper gear 302 and the lower gear 304 are always in meshing state. The reduction motor 2 drives the upper gear 302 to move, thereby driving the lower gear 304 to move in the opposite direction. At this time, the upper transmission shaft 303 drives the upper spindle 7 to rotate through the universal joint 402, and the lower transmission shaft 305 drives the lower spindle 8 to rotate through the universal joint 402; after loading, the upper spindle 7 and the lower spindle 8 clamp the workpiece. Due to the friction of the mold, the upper mold 701 and the lower mold 801 maintain synchronous rotation at the same linear speed (because they are in surface contact, which is equivalent to the same circumference), and the linear speed of the lower mold 801 is faster than the angular speed of the lower gear 304 (the angular speeds of the upper gear 302 and the lower gear 304 are still the same), so the lower spindle 8 drives the lower rotating shaft 805 to rotate rapidly through the universal joint 402.

[0037] like Figure 3 As shown, an upper sleeve 703 is sleeved on the outer side of the upper spindle 7, and the upper end of the upper sleeve 703 is connected to the spindle box 5 through a pull rod 702. A first side sleeve 704 is connected to the side wall of the upper sleeve 703, and an upper rotating shaft 705 connected to the spindle box 5 is provided in the first side sleeve 704.

[0038] like Figure 4 As shown, a lower shaft sleeve 802 is sleeved on the outer side of the lower spindle 8, and an oil cylinder 9 is connected between the bottom of the lower shaft sleeve 802 and the spindle box 5, and the lower spindle 8 is lifted by the oil cylinder 9. A second side shaft sleeve 804 is connected to the side wall of the lower shaft sleeve 802, and a lower rotating shaft 805 connected to the spindle box 5 is provided in the second side shaft sleeve 804.

[0039] One end of the upper rotating shaft 705 and the lower rotating shaft 805 are connected to the main shaft box 5 through a pin. Figure 5 As shown, the other ends of the upper rotating shaft 705 and the lower rotating shaft 805 are both inserted into the adjusting box 501 on the side wall of the spindle box 5 (the upper rotating shaft 705 and the lower rotating shaft 805 are each connected to an adjusting box 501), and the adjusting box 501 is fixed to the spindle box 5 by bolts. The upper rotating shaft 705 and the lower rotating shaft 805 can slide up and down in the adjusting box 501, and the upper and lower ends of the adjusting box 501 are provided with adjusting bolts 502 for tightening the upper rotating shaft 705 and the lower rotating shaft 805. The side wall of the adjusting box 501 is provided with a locking bolt 503 for fixing the upper rotating shaft 705 and the lower rotating shaft 805. The angle of the upper spindle 7 and the lower spindle 8 can be adjusted by the adjusting bolt 502, and the upper rotating shaft 705 and the lower rotating shaft 805 can be fixed by the locking bolt 503. During the machining process, the end of the upper spindle 7 or the lower spindle 8 may fall due to gravity, resulting in inconsistent thickness of the workpiece on both sides. The angle of the upper spindle 7 or the lower spindle 8 is adjusted by adjusting the bolt 502, thereby adjusting the distance between the upper mold 701 and the lower mold 801 (the side away from the spindle box 5) to offset the above problem, thereby ensuring uniform machining quality.

[0040] like Figure 6 As shown, a limit block 803 is provided on the side wall of the lower sleeve 802, and a first limit screw 504 is provided on the inner wall of the spindle box 5 to cooperate with the limit block 803 to limit the rising height of the lower spindle 8. The first limit screw 504 can be rotated to adjust the distance between it and the limit block 803.

[0041] The end of the lower sleeve 802, away from the lower die 801, is connected to a measuring plate 807 via a connecting rod 806. A vertical guide rail 507 is provided on the sidewall of the spindle box 5. The measuring plate 807 engages with the guide rail 507 via a slider 506. A displacement sensor 505 is provided on one side of the guide rail 507 to cooperate with the measuring plate 807. The displacement sensor 505 detects the displacement and sets the lifting speed of the lower spindle 8. Specifically, in the initial stage, the oil cylinder 9 rapidly raises the lower spindle 8, bringing the workpiece closer to the upper die 701 and increasing the loading speed. When the workpiece is about to contact the upper die 701, the oil cylinder 9 begins to slowly raise the lower spindle 8, stopping after machining is complete.

[0042] The upper mold 701 is provided with a guide mechanism 6 connected to the spindle box 5 on both sides, and a fixing seat 508 is provided on the side wall of the spindle box 5. Figure 7 As shown, the guide mechanism 6 includes a support seat 601, which is connected to the fixed seat 508 through a fixed plate 602. A cylinder 613 and a guide cylinder 607 are provided in the support seat 601. A pressure rod 605 is connected to the piston rod of the cylinder 613. Both ends of the pressure rod 605 are connected to guide rods 604 that pass through the guide cylinder 607. The lower end of the guide rod 604 is connected to a guide wheel seat 608. The bottom of the guide wheel seat 608 is connected to a guide wheel 609 for positioning the workpiece. There are two guide wheels 609, which position the two ends of the workpiece to prevent the workpiece from deviating during the forming process.

[0043] like Figure 8 As shown, the fixed plate 602 is provided with an arc-shaped connecting hole 603, and the fixing seat 508 fixes the fixed plate 602 through the positioning bolt 509 that cooperates with the connecting hole 603. Loosening the bolt can adjust the angle of the rotating guide mechanism 6 to adapt to different workpiece positioning; Figure 9 As shown, the fixed seat 508 is connected to a second limiting screw 510 that supports the support seat 601. When processing starts, the workpiece has an outward supporting force on the guide wheel 609. Therefore, the support seat 601 can be supported by the second limiting screw 510 to prevent it from rotating, thereby ensuring its firmness in use. The second limiting screw 510 can be rotated to adjust the distance between it and the support seat 601.

[0044] The side wall of the pressure rod 605 is connected to a third limit screw 606 that contacts and cooperates with the upper end of the support seat 601. The third limit screw 606 can limit the downward position of the guide wheel 609. The third limit screw 606 can be rotated, and the downward position of the guide wheel 609 during use can be adjusted by the third limit screw 606; the side wall of the support seat 601 is connected to a proximity switch 611 through a fixed plate 610, and the pressure rod 605 is provided with a detection piece 612 that cooperates with the proximity switch 611 to detect the position of the guide wheel 609 after it is raised to determine whether the guide wheel 609 is reset.

[0045] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A single-motor dual-spindle synchronous molding machine, comprising a spindle box and a reduction motor, wherein an upper spindle and a lower spindle are provided in the spindle box, an upper mold is provided at the end of the upper spindle, and a lower mold is provided at the end of the lower spindle to cooperate with the upper mold, characterized in that: The output shaft of the reduction motor is connected to a synchronization mechanism, which drives the upper and lower spindles to rotate through a transmission component; in the no-load stage, the upper spindle drives the lower spindle to rotate to achieve angular velocity synchronization; in the workpiece clamping stage, the upper mold drives the lower mold to rotate to achieve linear velocity synchronization; The synchronous mechanism includes a gear box, in which a parallel upper transmission shaft and a lower transmission shaft are provided, and the transmission component includes a universal coupling, one end of the upper transmission shaft is connected to the output shaft of the reduction motor through a coupling, and the other end of the upper transmission shaft is connected to the upper main shaft through a universal coupling, the outer side of the upper transmission shaft is sleeved with an upper gear, one end of the lower transmission shaft is connected to the lower main shaft through a universal coupling, the outer side of the lower transmission shaft is sleeved with a lower gear meshing with the upper gear, an overrunning clutch is provided between the lower gear and the lower transmission shaft, and a protective box is sleeved on the outer side of the universal coupling; the outer side of the upper main shaft is sleeved with an upper shaft sleeve, the upper end of the upper shaft sleeve is connected to the main shaft box through a pull rod, and the side wall of the upper shaft sleeve The upper part is connected to a first side shaft sleeve, and the first side shaft sleeve is provided with an upper rotating shaft connected to the main shaft box; the outer side of the lower main shaft is sleeved with a lower shaft sleeve, the bottom of the lower shaft sleeve and the main shaft box are connected with an oil cylinder, the side wall of the lower shaft sleeve is connected with a second side shaft sleeve, and the second side shaft sleeve is provided with a lower rotating shaft connected to the main shaft box; one end of the upper rotating shaft and the lower rotating shaft are connected to the main shaft box through a pin shaft, and the other end of the upper rotating shaft and the lower rotating shaft are inserted into the adjusting box on the side wall of the main shaft box, and the upper rotating shaft and the lower rotating shaft can slide up and down in the adjusting box, and the upper and lower ends of the adjusting box are provided with adjusting bolts that compress the upper rotating shaft and the lower rotating shaft, and the side wall of the adjusting box is provided with locking bolts for fixing the upper rotating shaft and the lower rotating shaft.

2. A single-motor dual-axis synchronous forming machine according to claim 1, characterized in that: A limiting block is provided on the side wall of the lower shaft sleeve, and a first limiting screw matched with the limiting block is provided on the inner wall of the main spindle box.

3. The single-motor dual-axis synchronous forming machine according to claim 1, characterized in that: The end of the lower sleeve away from the lower mold is connected to a measuring plate through a connecting rod. A vertical guide rail is provided on the side wall of the spindle box. The measuring plate cooperates with the guide rail through a slider. A displacement sensor for cooperating with the measuring plate is provided on one side of the guide rail.

4. A single-motor dual-axis synchronous forming machine according to claim 1, characterized in that: Guide mechanisms connected to the spindle box are provided on both sides of the upper mold, and a fixed seat is provided on the side wall of the spindle box. The guide mechanism includes a support seat, which is connected to the fixed seat through a fixed plate. A cylinder and a guide tube are provided in the support seat. A pressure rod is connected to the piston rod of the cylinder, and both ends of the pressure rod are connected to guide rods passing through the guide tube. The lower end of the guide rod is connected to a guide wheel seat, and the bottom of the guide wheel seat is connected to a guide wheel for positioning the workpiece.

5. A single-motor dual-axis synchronous forming machine as claimed in claim 4, characterized in that: The fixing plate is provided with an arc-shaped connecting hole, and the fixing seat fixes the fixing plate through a positioning bolt matched with the connecting hole. The fixing seat is connected to a second limiting screw that supports the support seat.

6. A single-motor dual-axis synchronous forming machine as claimed in claim 4, characterized in that: The side wall of the pressure rod is connected to a third limiting screw that contacts and cooperates with the upper end of the support seat. The side wall of the support seat is connected to a proximity switch through a fixing plate. The pressure rod is provided with a detection piece that cooperates with the proximity switch.

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