A torsion-driven high-speed precision punching mechanism

Abstract

This invention relates to a torsion-driven high-speed precision punching mechanism. The mechanism includes a reduction mechanism, a crank-rocker mechanism, a torsion mechanism, and a balancing mechanism. The reduction mechanism and the crank-rocker mechanism are arranged horizontally on the punching machine base. The torsion mechanism consists of a swing block, connecting rods, and a main slide. The swing block and the main slide are connected to the connecting rods via spherical hinges, the connecting rods are of equal length, and the rotation axes of the spherical hinges of the swing block and the main slide coincide. Two sets of balancing mechanisms are symmetrically arranged on both sides along the centerline formed by the center of the balancing slide and the center of the main slide. Each balancing mechanism consists of a rocker arm, a support rod, a push rod, and a balancing slide. Except for the balancing slide and the main slide, which are connected to the punching machine body via sliding joints, and the connecting rods, swing blocks, and the main slide, which are connected via spherical hinges, all other components are connected by revolute joints. The main mechanism used in this invention has fewer kinematic pairs in the transmission chain and higher rigidity, effectively improving the punching accuracy of the punching machine.

Description

Technical Field

[0001] This invention belongs to the technical field of punch presses, and in particular to a high-speed precision punch press mechanism with torsion drive. Background Technology

[0002] High-speed precision punch presses are widely used in the stamping of precision parts for communication equipment, transformers, motor stators and rotors, etc. Compared with traditional punch presses, they have an absolute advantage in terms of the quality and efficiency of stamped parts. Due to their high stamping speed and large inertia, a dynamic balancing system is usually required to eliminate the huge inertial forces generated during the motion.

[0003] The precision high-speed punch press disclosed in patent CN106739065A consists of a frame, a slide block, a crank mechanism, and a drive motor. Two crank mechanisms are symmetrically arranged inside the crossbeam, and each crank mechanism is connected to the slide block. The drive motor is located at the top of the crossbeam and drives the crank mechanisms through a gear transmission mechanism, thereby causing the slide block to reciprocate up and down.

[0004] Patent CN 114889185 A discloses a multi-link high-speed punch press, including a slider, an adjusting block, a linkage mechanism, and a balancing mechanism. The slider is connected to the crankshaft via the linkage mechanism, and the adjusting block is connected to the linkage mechanism. The adjusting block has only the freedom to move up and down. A worm gear mechanism is provided between the adjusting block and the punch press frame to adjust the position of the adjusting block. The stroke of the slider is changed by adjusting the up and down position of the adjusting block. The balancing mechanism is connected to the linkage mechanism to balance the inertial forces of the slider, adjusting block, and linkage mechanism during operation.

[0005] Patent CN106739065A discloses a precision high-speed punch press that uses a traditional crank-slider mechanism as the main transmission mechanism and a dynamic balancing device on the upper part of the machine tool. Although this can balance inertial forces, it also increases the complexity of the overall structure, and results in greater thermal deformation and lower rigidity. Patent CN103144338A discloses a multi-link high-speed punch press that uses a complex multi-link mechanism with many kinematic pairs, increasing the error. Summary of the Invention

[0006] The purpose of this invention is to provide a high-speed precision punching mechanism for torsion stamping, so as to avoid the punching force on the main slide acting directly on the crankshaft and improve the structural rigidity of the machine tool.

[0007] The technical solution to achieve the purpose of this invention is as follows:

[0008] A torsion-driven high-speed precision punching mechanism, comprising:

[0009] The reduction gear mechanism, as a power drive unit, drives the operation of the crank-rocker mechanism;

[0010] The crank-rocker mechanism, as a transmission mechanism, drives the reciprocating oscillation of the torsion mechanism;

[0011] The torsion mechanism drives the main slide block to move up and down reciprocally through reciprocating oscillation, thereby completing the stamping process; the torsion mechanism includes an oscillating disk and multiple connecting rods;

[0012] The swing disk is connected to the machine body via a rotating joint, and multiple first spherical hinges are arranged on the lower surface of the swing disk;

[0013] Multiple first spherical hinges are arranged on a circle with the rotation center of the swing disk as the axis, and they do not overlap. Multiple second spherical hinges are arranged on the upper surface of the main slider. The multiple second spherical hinges are arranged on a circle with non-overlapping radius. The radius of this circle is the same as the radius of the circle on the lower surface of the swing disk where the first spherical hinges are arranged, and the centers of the two circles are on a vertical axis. The multiple first spherical hinges on the swing disk are arranged in the same way as the second spherical hinges on the main slider. Multiple connecting rods are of equal length. One end of each connecting rod is connected to the swing disk through a first spherical hinge, and the other end is connected to the main slider through a second spherical hinge.

[0014] The balancing mechanisms, symmetrically arranged on the left and right sides of the main slider, together with the main slider, form a lever mechanism to balance the inertial force generated when the main slider moves.

[0015] The significant advantages of this invention compared to existing technologies are:

[0016] This invention improves the anti-eccentric load capacity of the punch press during the stamping process; secondly, the huge stamping force generated during the main slide punching process is distributed to the bed through the connecting rod, avoiding the punching force from acting directly on the crankshaft, which is beneficial to improving the punching accuracy of the stamped parts and extending the service life of the punch press; in addition, through appropriate structural adjustments, these mechanisms can achieve compensation for the dynamic accuracy of the bottom dead center. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0018] Figure 2 This is a schematic diagram of the swing block 8 structure in Embodiment 1 of the present invention.

[0019] Figure 3 This is a schematic diagram of the main mechanism structure of Embodiment 1 of the present invention.

[0020] Figure 4 This is a schematic diagram of the leftward rotation of the swing disk at the top dead center in Embodiment 1 of the present invention.

[0021] Figure 5 This is a schematic diagram of the right-hand top dead center of the oscillating disk in Embodiment 1 of the present invention.

[0022] Figure 6This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0023] Figure 7 This is a schematic diagram of the main structural space of Embodiment 2 of the present invention. Detailed Implementation

[0024] It is readily understood that, based on the technical solution of this invention, those skilled in the art can conceive of various embodiments of this invention without altering its essential spirit. Therefore, the following specific embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of this invention or as limitations or restrictions on its technical solution.

[0025] Example 1

[0026] like Figure 1 As shown in the figure, the structure of the high-speed precision punching mechanism in this embodiment includes a reduction mechanism, a crank-rocker mechanism, a torsion mechanism, and a balancing mechanism; each of the left and right balancing mechanisms includes a set of lever mechanisms, and the left and right balancing mechanisms are symmetrically connected to the main slide.

[0027] The reduction mechanism includes a motor 1, a driving pulley 3, a belt 4, and a driven pulley 5. The rotating joint is arranged in a vertical plane. The motor 1 is connected to the driving pulley 3 via a coupling 2; the driving pulley 3 is connected to the driven pulley 5 via the belt 4; and the driven pulley 5 is connected to a crank-rocker mechanism.

[0028] The crank-rocker mechanism consists of a crankshaft 6 and a rocker arm 7. The rotation of the crankshaft 6 drives the rocker disc 8 to reciprocate. The crankshaft 6 is connected to the driven wheel 5 and to the rocker arm 7 via a revolute joint. The rocker arm 7 is connected to the rocker disc 8 via a revolute joint. The rocker disc 8 is connected to the machine body via a revolute joint, specifically a thrust bearing positioned above the rocker disc 8. The rotation axes of the crankshaft 6, the revolute joint axis of the rocker arm 7, and the rotation axis of the rocker disc 8 are parallel to each other. The rotation axis of the driven wheel 5 coincides with the rotation axis of the crankshaft of the crank-rocker mechanism.

[0029] Combination Figure 2 , Figure 3The torsion mechanism includes a swing disk 8, three connecting rods (9a, 9b, 9c), and a main slider 10. The swing disk 8 is connected to the machine body via a revolute joint, specifically a planar thrust bearing arranged above the swing disk 8. Three first spherical hinges (16a, 16b, 16c) are arranged on the lower surface of the swing disk 8, and these three first spherical hinges (16a, 16b, 16c) are arranged on a circumference with the rotation center of the swing disk 8 as the axis, and they do not overlap. The main slider 10 is connected to the machine body via a sliding joint and can only move up and down. Three second spherical hinges (17a, 17b, 17c) are arranged on the upper surface of the main slider 10, and these three second spherical hinges (17a, 17b, 17c) are arranged on a circumference, and the radius of this circumference is the same as the radius of the circumference of the first spherical hinges (16a, 16b, 16c) on the lower surface of the swing disk, and the centers of the two circumferences are on a vertical axis. The first spherical hinges (16a, 16b, 16c) are positioned relative to the center of the circle in the same way as the second spherical hinges (17a, 17b, 17c) on the swing disk. Both the swing disk 8 and the main slider 10 are horizontally arranged. The three connecting rods (9a, 9b, 9c) are of equal length, with one end connected to the swing disk via the three first spherical hinges (16a, 16b, 16c). The other end is connected to the main slider via the three second spherical hinges (17a, 17b, 17c). The arrangement of the multiple first spherical hinges on the swing disk 8 is the same as that of the second spherical hinges on the main slider 10.

[0030] The left balancing mechanism consists of a left swing rod 11a, a left support rod 12a, a left push rod 13a, and a left balancing slider 14a. The left support rod 12a is a lever with its fulcrum set in the middle position. The left support rod 12a is mounted on the machine body via a fulcrum revolute joint 15a. The left balancing slider 14a is connected to the punch press body via a kinematic joint and can only move up and down. The left swing rod 11a, left support rod 12a, left push rod 13a, and left balancing slider 14a are connected in sequence by revolute joints. One end of the left swing rod 11a is connected to the main slider 10 via a revolute joint, and the other end of the left swing rod 11a is connected to one end of the left support rod 12a. One end of the left push rod 13a is connected to the left balancing slider 14a via a revolute joint, and the other end of the left push rod 13a is connected to a section of the left support rod 12a.

[0031] The right balancing mechanism consists of a right swing rod 11b, a right support rod 12b, a right push rod 13b, and a right balancing slider 14b. The right support rod 12b is a lever with its fulcrum set in the middle position. The right push rod 12b is mounted on the machine body via a fulcrum revolute joint 15b. The right balancing slider 14b is connected to the punch press machine body via a kinematic joint and can only move up and down. The right swing rod 11b, right support rod 12b, right push rod 13b, and right balancing slider 14b are connected in sequence by revolute joints. One end of the right swing rod 11b is connected to the main slider 10 via a revolute joint, and the other end of the right swing rod 11b is connected to one end of the right support rod 12b. One end of the right push rod 13b is connected to the right balancing slider 14b via a revolute joint, and the other end of the right push rod 13b is connected to one end of the right support rod 12b.

[0032] Electric motor 1 drives small pulley 3 to rotate via coupling 2. Small pulley 3 drives large pulley 5 to rotate. Large pulley 5 is connected to crankshaft 6. The rotation of crankshaft 6 is the main motion. Crankshaft 6 drives oscillating disc 8 to oscillate left and right via connecting rod 7. Figure 4 , Figure 5 Driven by the crank-slider mechanism, the swing disk 8 swings left and right around the center of rotation. During the swing, the connecting rod changes from a vertical state to an inclined state, thereby driving the main slider 10 to move upward. When the swing disk 8 swings to its left and right limits, the main slider 10 is at the top dead center. When the swing disk 8 is in the middle position, the main slider 10 is at the bottom dead center. The main slider 10 performs up-and-down reciprocating motion, thereby completing the stamping process. The main slider 10 also serves as the active force-applying component for the left swing arm 11a of the left balance mechanism and the right swing arm 11b of the right balance mechanism. The left support rod 12a and the right support rod 12b are the passive force-output components for the left branch left swing arm 11a and the right branch right swing arm 11b, respectively. They drive the left balance slider 14a and the right balance slider 14b to perform up-and-down reciprocating motion through the left push rod 13a and the right push rod 13b, respectively. The direction of motion of the balance slider is exactly opposite to the direction of motion of the main motion slider, which can balance the inertial force generated when the main motion slider moves at high speed.

[0033] Example 2

[0034] like Figure 6As shown, the difference between this embodiment and Embodiment 1 is that the connecting rods of the main transmission system in Embodiment 1 are changed from three to four (9a, 9b, 9c, 9d). The number of first spherical hinges (16a, 16b, 16c, 16d) is four. The four first spherical hinges (16a, 16b, 16c, 16d) are arranged on a circle with the rotation center of the swing disk 8 as the axis and do not overlap. The number of second spherical hinges (17a, 17b, 17c, 17d) is four. Four second spherical hinges (17a, 17b, 17c, 17d) are arranged on a circle, and do not overlap. The centers of the two circles are on a vertical axis. The four links should be of equal length, and their ends should be connected to the four first spherical hinges (16a, 16b, 16c, 16d) and the four second spherical hinges (17a, 17b, 17c, 17d) respectively. When the four links (9a, 9b, 9c, 9d) are vertical, the main slider is located at the bottom dead center. Figure 7 As shown, the connecting rods are arranged symmetrically on the main slider.

Claims

1. A high speed precision punch mechanism driven by torsion, characterized by, It comprises: a deceleration mechanism as a power driving unit to drive the operation of the crank rocker mechanism; the crank rocker mechanism as a transmission mechanism to drive the reciprocating swing of the torsion mechanism; the torsion mechanism to drive the reciprocating movement of the main slide up and down through the reciprocating swing, thereby completing the stamping process; the torsion mechanism comprises a swing plate, a plurality of connecting rods; the swing plate is connected to the machine body through a rotary pair, and a plurality of first spherical hinges are arranged on the lower surface of the swing plate; the plurality of first spherical hinges are arranged on a circumference with the rotary center of the swing plate as the axis and do not coincide; a plurality of second spherical hinges are arranged on the upper surface of the main slide, and the plurality of second spherical hinges are arranged on a circumference without coinciding, the radius of the circumference is consistent with the radius of the circumference where the first spherical hinges on the lower surface of the swing plate are arranged, and the centers of the two circumferences are on a vertical axis; the plurality of first spherical hinges on the swing plate and the second spherical hinges on the main slide are arranged in the same way; the plurality of connecting rods are equal in length, one end of each connecting rod is connected to the swing plate through a first spherical hinge, and the other end is connected to the main slide through a second spherical hinge; the balance mechanism symmetrically arranged on the left and right sides of the main slide and the main slide constitute a lever mechanism to balance the inertial force generated when the main slide moves.

2. The torsionally driven high speed precision punch press mechanism of claim 1 wherein, The balance mechanism comprises a swing rod, a support rod, a push rod, and a balance slide; the support rod fulcrum is arranged at the middle position, and the pressure rod is installed on the machine body through the fulcrum rotary pair, the balance slide is connected to the punch machine body through a motion pair and can only move up and down; the swing rod, the support rod, the push rod, and the balance slide are connected in turn through rotary pairs, wherein one end of the swing rod is connected to the main slide through a rotary pair, the other end of the swing rod is connected to one end of the support rod, one end of the push rod is connected to the balance slide through a rotary pair, and the other end of the push rod is connected to one end of the support rod; the movement direction of the balance slide is opposite to the movement direction of the main slide.

3. The torsionally driven high speed precision punch press mechanism of claim 1 wherein, The crank rocker mechanism comprises a crankshaft and a swing rod; the crank is connected to a driven wheel and connected to the torsion mechanism through a rotary pair.

4. The torsionally driven high speed precision punch press mechanism of claim 1 wherein, The deceleration mechanism comprises a motor, a driving wheel, a belt, and a driven wheel; the motor is connected to the driving wheel through a shaft coupling; the driving wheel is connected to the driven wheel through the belt; the driven wheel is connected to the crank rocker mechanism, and the rotary axis of the driven wheel coincides with the rotary axis of the crankshaft of the crank rocker mechanism.

5. The torsionally driven high speed precision punch press mechanism of claim 1 wherein, The number of connecting rods is ≥3.

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