A structure and method for dynamic bottom dead center compensation for a punch press

Abstract

This invention discloses a dynamic compensation structure and method for the bottom dead center (BDC) of a punch press. The structure includes a bed, dynamic balancing mechanism, main slide, main crankshaft, and transmission mechanism. The transmission mechanism includes two adjusting components and two transmission components. The adjusting components include a first connecting rod, a second connecting rod, and a third connecting rod. The transmission components include a balancing connecting rod and a lower connecting rod. Two servo motors drive the corresponding adjusting crankshafts to rotate, causing the second connecting rod to move synchronously, thereby adjusting the angle between the first and third connecting rods. This, in turn, drives the two first shafts to move synchronously towards or away from each other, and through the corresponding lower connecting rods, drives the main slide to descend or ascend. The dynamic compensation structure and method for the bottom dead center of the punch press provided by this invention achieve dynamic compensation of the bottom dead center position of the main slide, effectively suppressing bottom dead center drift caused by inertial force fluctuations and thermal deformation, and improving stamping accuracy and product consistency.

Description

Technical Field

[0001] This invention relates to the field of punch press equipment technology, and in particular to a dynamic compensation structure and method for bottom dead center of a punch press. Background Technology

[0002] Toggle-type punch presses are widely used in precision stamping due to their advantages of high transmission efficiency, amplified punching force through a linkage structure, and smooth slide motion curve at the bottom dead center. A typical toggle-type punch press usually includes a crankshaft, counterweight, connecting rod mechanism, and slide. The crankshaft rotation drives the connecting rod mechanism to move the slide vertically to complete the stamping operation. Simultaneously, the counterweight moves in the opposite direction to counteract the inertial force generated by the slide's reciprocating motion, ensuring the stability of the equipment operation.

[0003] In actual stamping operations, the repeatability accuracy of the lower limit position (i.e., the bottom dead center position) of the main slide plays a decisive role in the forming quality of the stamped parts. However, in practical applications, the changes in the bottom dead center position mainly occur in the following two situations: First, with the increase in stamping efficiency, the crankshaft speed continues to increase, resulting in an increase in inertial force, which in turn causes fluctuations in the bottom dead center position of the main slide; Second, changes in ambient temperature, as well as the accumulation of heat generated by friction in the connecting rod joints of the transmission mechanism during high-speed operation, cause thermal expansion and contraction of the connecting rod length, which in turn causes the bottom dead center position to drift, ultimately affecting the consistency of the stamped parts.

[0004] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a dynamic compensation structure and method for bottom dead center of a punch press to solve the above problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dynamic compensation structure for the bottom dead center of a punch press includes a bed, a balance block slidably connected to the bed in a vertical direction, a main slide block slidably connected to the bed in a vertical direction, a main crankshaft rotatably connected to the bed, and a transmission mechanism. The main crankshaft is connected to the balance block and the main slide block through the transmission mechanism to drive the balance block and the main slide block to move synchronously in opposite directions. The main crankshaft includes a first eccentric part and a second eccentric part. The transmission mechanism includes two adjusting components and two transmission components. The two adjusting components are located on both sides of the axis of the main crankshaft, and the two adjusting components correspond one-to-one with the first eccentric part and the second eccentric part and are movably connected. The two transmission components are connected to the corresponding adjusting components. Each transmission component is movably connected to the balance block and the main slide block.

[0008] The adjustment component includes:

[0009] The first connecting rod, one end of which is rotatably connected to the corresponding first eccentric part / second eccentric part;

[0010] The second connecting rod, one end of which is rotatably connected to the other end of the first connecting rod;

[0011] The adjusting crankshaft is rotatably connected to the bed body. The adjusting crankshaft is provided with a third eccentric part. The other end of the second connecting rod is rotatably connected to the third eccentric part. A servo motor is provided at the input end of the adjusting crankshaft;

[0012] The third connecting rod, one end of which is rotatably connected to the other end of the first connecting rod; a first shaft is rotatably connected to the other end of the third connecting rod; the first shaft is slidably connected to the bed body in the horizontal direction;

[0013] The transmission component includes:

[0014] The balance connecting rod, one end of which is rotatably connected to the first shaft and the other end is rotatably connected to the balance weight;

[0015] The lower connecting rod, one end of which is rotatably connected to the first shaft and the other end is rotatably connected to the main slider;

[0016] Two servo motors respectively drive the corresponding adjusting crankshafts to rotate,带动 the second connecting rods to move synchronously, so as to adjust the included angle between the first connecting rod and the third connecting rod, and further drive the two first shafts to move synchronously towards or away from each other, and drive the main slider to descend or ascend through the corresponding lower connecting rods, realizing dynamic compensation of the bottom dead center position.

[0017] Further, a second shaft is fixedly provided at the end of the second connecting rod far from the crankshaft, and the first connecting rod and the third connecting rod are respectively rotatably connected to the second shaft.

[0018] Further, the first connecting rod, the second connecting rod and the third connecting rod form a "Y" - shaped structure.

[0019] Further, the first connecting rod, the second connecting rod and the third connecting rod form a "one" - shaped structure.

[0020] Further, there are two second eccentric parts. The two second eccentric parts are symmetrically arranged on both sides of the first eccentric part and are not coaxially arranged with the first eccentric part; there is one first connecting rod in the adjusting component movably connected to the first eccentric part, and one end of this first connecting rod is rotatably connected to the first eccentric part; there are two first connecting rods in the adjusting component movably connected to the second eccentric parts, and one ends of the two first connecting rods are respectively rotatably connected to the two second eccentric parts.

[0021] Furthermore, the two ends of the first shaft are rotatably connected to movable sliders, and the side wall of the bed is provided with guide components corresponding to the movable sliders one by one. The guide components include two parallel pads, and the movable sliders are embedded between the two pads and slidably connected to the two pads.

[0022] Furthermore, the main slider is provided with two connecting columns, which are rotatably connected to the corresponding lower connecting rods; the bed is fixed with a third guide sleeve corresponding to each connecting column, and the connecting column is slidably connected to the third guide sleeve in the vertical direction.

[0023] A bottom dead center dynamic compensation method is provided, which is applied to the bottom dead center dynamic compensation structure for the punch press. The bottom dead center dynamic compensation method includes the following steps:

[0024] Obtain the preset bottom dead center position range and obtain the real-time bottom dead center position information of the main slider;

[0025] The real-time bottom dead center position information is compared with the preset bottom dead center position range, and the position deviation value is determined based on the comparison result;

[0026] Based on the position deviation value, the rotation direction of the adjusting crankshaft is adjusted to move the main slider up or down.

[0027] Furthermore, the bottom dead center dynamic compensation method also includes:

[0028] If the real-time bottom dead position information is greater than the maximum value of the preset bottom dead position interval, calculate the first position deviation value between the real-time bottom dead position information and the maximum value of the preset bottom dead position interval.

[0029] Based on the first position deviation value, two servo motors are controlled to drive the corresponding adjustment crankshafts to rotate, so that the second connecting rod pushes the hinge point between the first connecting rod and the third connecting rod to move, causing the first shaft to translate away from the main crankshaft. The two first shafts respectively drive the corresponding lower connecting rods to swing upward, thereby driving the main slider to move upward.

[0030] If the real-time bottom dead position information is less than the minimum value of the preset bottom dead position interval, calculate the second position deviation value between the real-time bottom dead position information and the minimum value of the preset bottom dead position interval.

[0031] Based on the second position deviation value, the two servo motors are controlled to drive the corresponding adjustment crankshafts to rotate in the opposite direction, so that the second connecting rod pushes the hinge point of the first connecting rod and the third connecting rod to move, causing the first shaft to translate in the direction of the main crankshaft. The two first shafts respectively drive the corresponding lower connecting rods to swing downward, thereby driving the main slider to move downward.

[0032] Beneficial effects:

[0033] This invention provides a dynamic compensation structure for the bottom dead center of a punch press. During the punching process, the main crankshaft drives the first connecting rods in the two adjusting components on both sides to move synchronously through the first and second eccentric parts. The first and third connecting rods work together to drive the first shaft to move reciprocally horizontally. The first shaft drives the main slide to move up and down through the lower connecting rod to achieve punching. Simultaneously, the balance block moves in the opposite direction to the main slide through the balance connecting rod to counteract the inertial force and ensure smooth operation of the equipment. The entire transmission mechanism has a small number of connecting rods, low cumulative installation error, and high precision of the main slide movement. When bottom dead center position compensation is required, the servo motor drives the adjusting crankshaft to adjust the angle between the first and third connecting rods, driving the first shaft to translate and driving the main slide to make fine adjustments up and down, thereby achieving dynamic compensation of the bottom dead center position. This effectively suppresses bottom dead center drift caused by inertial force fluctuations and thermal deformation, improving punching accuracy and product consistency.

[0034] This invention provides a dynamic compensation method for the bottom dead center. By setting a position sensor on the main slider to detect the real-time bottom dead center position information of the main slider, comparing the deviation value of the real-time bottom dead center position information with the preset bottom dead center position range, and combining it with a mechanical compensation structure driven by a servo motor to form a closed-loop control, the bottom dead center position of the main slider can be quickly adjusted to ensure that it is always stable within the preset range, so that the processing dimensions of the stamped parts meet the production requirements and improve the production yield. Attached Figure Description

[0035] Figure 1 This invention provides a partial structure of a dynamic compensation structure for the bottom dead center of a punch press. Figure 1 ;

[0036] Figure 2 This invention provides a partial structure of a dynamic compensation structure for the bottom dead center of a punch press. Figure 2 ;

[0037] Figure 3 This is a main sectional view of a dynamic compensation structure for the bottom dead center of a punch press provided by the present invention;

[0038] Figure 4 An exploded view of a dynamic compensation structure for the bottom dead center of a punch press provided by the present invention;

[0039] Figure 5 This invention provides a structural diagram of the main crankshaft in a dynamic compensation structure for the bottom dead center of a punch press.

[0040] Figure 6 This is a schematic diagram of the first embodiment of a dynamic compensation structure for the bottom dead center of a punch press provided by the present invention.

[0041] Figure 7 This is a schematic diagram of the second embodiment of the dynamic compensation structure for the bottom dead center of a punch press provided by the present invention.

[0042] Figure 8 The diagram illustrates the logic principle of a dynamic compensation method for bottom dead center provided by this invention.

[0043] Reference numerals: Bed 1, Pad 11, Third Guide Sleeve 12, First Guide Post 13, Second Guide Sleeve 14, Balance Block 2, Second Guide Post 21, Main Slider 3, Connecting Post 31, First Guide Sleeve 32, Main Crankshaft 4, First Eccentric Part 41, Second Eccentric Part 42, Support Part 43, Adjustment Assembly 5, First Connecting Rod 51, Second Connecting Rod 52, Adjustment Crankshaft 53, Third Eccentric Part 531, Servo Motor 54, Third Connecting Rod 55, First Shaft 56, Second Shaft 57, Movable Slider 58, Lubricating Copper Plate 581, Transmission Assembly 6, Balance Link 61, Lower Link 62. Detailed Implementation

[0044] This invention provides a dynamic compensation structure and method for the bottom dead center of a punch press. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0045] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0046] Please see Figures 1 to 7As shown, the present invention provides a dynamic compensation structure for the bottom dead center of a punch press, including a bed 1, a balance block 2 slidably connected to the bed 1 in the vertical direction, a main slide block 3 slidably connected to the bed 1 in the vertical direction, a main crankshaft 4 rotatably connected to the bed 1, and a transmission mechanism. The main crankshaft 4 is connected to the balance block 2 and the main slide block 3 through the transmission mechanism to drive the balance block 2 and the main slide block 3 to move synchronously in opposite directions. The main crankshaft 4 includes a first eccentric part 41 and a second eccentric part 42. The transmission mechanism includes two adjusting components 5 and two transmission components 6. The two adjusting components 5 are located on both sides of the axis of the main crankshaft 4, and the two adjusting components 5 correspond one-to-one with the first eccentric part 41 and the second eccentric part 42 and are movably connected. The two transmission components 6 are connected to the corresponding adjusting components 5, and each transmission component 6 is movably connected to the balance block 2 and the main slide block 3. During the stamping process, the power source of the punch press drives the main crankshaft 4 to rotate. The main crankshaft 4 drives two adjusting components 5 to move through the first eccentric part 41 and the second eccentric part 42 respectively. The adjusting components 5 transmit the motion to the corresponding transmission components 6. The transmission components 6 drive the balance block 2 and the main slide block 3 to move synchronously in opposite directions in the vertical direction. The power source is not shown in the attached figure. The power source includes a motor and a flywheel. The output end of the motor is connected to the flywheel through a belt. The flywheel drives the main crankshaft 4 to rotate, thereby realizing stable power transmission.

[0047] The adjustment assembly 5 includes: a first connecting rod 51, a second connecting rod 52, and an adjusting crankshaft 53; one end of the first connecting rod 51 is rotatably connected to the corresponding first eccentric part 41 / second eccentric part 42; one end of the second connecting rod 52 is rotatably connected to the other end of the first connecting rod 51; the adjusting crankshaft 53 is rotatably connected to the bed 1, the adjusting crankshaft 53 is provided with a third eccentric part 531, the other end of the second connecting rod 52 is rotatably connected to the third eccentric part 531, and the input end of the adjusting crankshaft 53 is provided with a servo motor 54; one end of the third connecting rod 55 is rotatably connected to the other end of the first connecting rod 51; the other end of the third connecting rod 55 is rotatably connected to a first shaft 56; the first shaft 56 and... The bed 1 is slidably connected in the horizontal direction; the transmission assembly 6 includes: a balance link 61 and a lower link 62; one end of the balance link 61 is rotatably connected to the first shaft 56, and the other end is rotatably connected to the balance block 2; one end of the lower link 62 is rotatably connected to the first shaft 56, and the other end is rotatably connected to the main slider 3; two servo motors 54 respectively drive the corresponding adjusting crankshaft 53 to rotate, thereby driving the second link 52 to move synchronously to adjust the angle between the first link 51 and the third link 55, thereby driving the two first shafts 56 to move synchronously towards or away from each other, and driving the main slider 3 to move down or up through the corresponding lower link 62, thereby realizing dynamic compensation of the bottom dead center position.

[0048] When bottom dead center compensation is required, the two servo motors 54 are controlled to rotate synchronously in opposite directions, driving the two adjusting crankshafts 53 to rotate synchronously in opposite directions by a preset angle. As the adjusting crankshaft 53 rotates, its third eccentric part 531 rotates accordingly, thereby driving the second connecting rod 52 to perform a push-pull motion. The following is a detailed explanation using the adjusting assembly 5 and transmission assembly 6 located on the right side of the main crankshaft 4 as an example: Figure 3 As shown, when the second link 52 is pushed upward, it drives the common hinge point of the first link 51 and the third link 55 to rise upward, and the angle between the first link 51 and the third link 55 gradually increases, so as to push the first shaft 56 to slide horizontally to the right. The first shaft 56 drives the lower link 62 to swing upward, so as to pull the main slider 3 to move upward, and at the same time drive the balance link 61 to pull the balance block 2 downward, always maintaining the synchronous and opposite movement relationship between the balance block 2 and the main slider 3. Conversely, when the second link 52 is pulled downward, the common hinge point of the first link 51 and the third link 55 is pulled downward, and the angle between them gradually decreases, driving the first shaft 56 to slide to the left. When the first shaft 56 moves to the left, the lower link 62 swings downward, pushing the main slider 3 to move downward, and at the same time the balance link 61 drives the balance block 2 to move upward, ensuring that the synchronous and opposite movement state of the two does not change. By precisely controlling the rotation angle of the crankshaft 53 through the servo motor 54, the bottom dead center position of the main slide block 3 is finely adjusted and compensated, ensuring that the bottom dead center position of the main slide block 3 is always kept within the set tolerance range during each stamping process, thereby improving the bottom dead center repeatability accuracy of the main slide block 3 and ensuring the dimensional accuracy and consistency of the stamped parts.

[0049] In a preferred embodiment, see [reference] Figure 3 A second shaft 57 is fixed to the end of the second connecting rod 52 away from the crankshaft, and the first connecting rod 51 and the third connecting rod 55 are rotatably connected to the second shaft 57 respectively. Specifically, the ends of the first connecting rod 51 and the third connecting rod 55 are rotatably connected to the second shaft 57 through copper sleeves. By using the second shaft 57 on the second connecting rod 52, the first connecting rod 51 and the third connecting rod 55 are synchronously hinged, which not only improves the structural strength and rotational stability of the connection part of the three connecting rods, but also ensures that the driving force of the second connecting rod 52 is synchronously transmitted to the first connecting rod 51 and the third connecting rod 55, effectively avoiding motion errors caused by loose connections and transmission gaps.

[0050] The combined structure of the first link 51, the second link 52, and the third link 55 has the following two implementation methods:

[0051] The first implementation method, see [link / reference] Figure 6The first connecting rod 51, the second connecting rod 52, and the third connecting rod 55 form a "Y"-shaped structure. In this "Y"-shaped structure, the first connecting rod 51 and the third connecting rod 55 are located on the top two sides of the second connecting rod 52, respectively. The entire structural layout is evenly distributed circumferentially along the axis of the second shaft 57, resulting in a more balanced force distribution. Simultaneously, there is less motion interference during transmission, allowing full utilization of the limited installation space inside the punch press and adaptability to punch presses of different specifications. The above embodiment is a preferred embodiment of the present invention.

[0052] For the second implementation method, please refer to... Figure 7 The first connecting rod 51, the second connecting rod 52, and the third connecting rod 55 form a "U"-shaped structure. In this "U"-shaped structure, the first connecting rod 51 and the third connecting rod 55 are located on both sides of the second connecting rod 52, that is, the second connecting rod 52 is located between the angle between the first connecting rod 51 and the third connecting rod 55. Although it can also achieve the function of adjusting the angle between the first connecting rod 51 and the third connecting rod 55, the arrangement of each connecting rod must avoid mutual interference, resulting in a larger installation space required compared to the "Y"-shaped structure. This places higher demands on the internal space layout of the punch press and is suitable for large punch press equipment with sufficient installation space.

[0053] In a preferred embodiment, see [reference] Figure 4 The second eccentric portion 42 is provided in two parts, symmetrically arranged on both sides of the first eccentric portion 41 and not coaxial with the first eccentric portion 41. Specifically, the main crankshaft 4 also includes two support portions 43 rotatably connected to the bed 1. The two support portions 43 are respectively located on the side of the two second eccentric portions 42 away from the first eccentric portion 41, used to support the main crankshaft 4 and ensure its rotational stability. The distance between the axis of the first eccentric portion 41 and the axis of the support portion 43 is equal to the distance between the axis of the second eccentric portion 42 and the axis of the support portion 43, and the axes of the first eccentric portion 41, the second eccentric portion 42, and the support portion 43 are all on the same plane. Through the above arrangement, the dynamic balance of the main crankshaft 4 during rotation is achieved, and the two adjustment components 5 can be driven to move synchronously, thereby driving the transmission components 6 on both sides to operate in a coordinated manner.

[0054] Specifically, the adjustment assembly 5 located on the left side of the main crankshaft 4 is described: The adjustment assembly 5, which is movably connected to the first eccentric part 41, is provided with a first connecting rod 51. One end of the first connecting rod 51 is rotatably connected to the first eccentric part 41, and the other end is rotatably connected to the second shaft 57. The adjustment assembly 5 is provided with two second connecting rods 52 and two third connecting rods 55. The two third connecting rods 55 are symmetrically distributed on both sides of the first connecting rod 51 and are rotatably connected to the second shaft 57 respectively. The two second connecting rods 52 are symmetrically distributed on the side of the two third connecting rods 55 away from the first connecting rod 51 and are fixedly connected to the second shaft 57.

[0055] Taking the adjusting assembly 5 located on the right side of the main crankshaft 4 as an example: the adjusting assembly 5, which is movably connected to the second eccentric part 42, has two first connecting rods 51. One end of each first connecting rod 51 is rotatably connected to the two second eccentric parts 42, and the other end is rotatably connected to the second shaft 57. The adjusting assembly 5 has a third connecting rod 55 and two symmetrically arranged second connecting rods 52. The third connecting rod 55 is rotatably connected to the middle of the second shaft 57, and the two second connecting rods 52 are symmetrically distributed on both sides of the third connecting rod 55 and fixedly connected to the second shaft 57. The two first connecting rods 51 are symmetrically arranged on both sides of the second connecting rods 52 away from the third connecting rod 55. Through the above symmetrical layout, the two second shafts 57 are subjected to uniform force, effectively avoiding the problem of uneven force on the second shaft 57 caused by single connecting rod transmission. This ensures that the second shaft 57 always maintains a horizontal posture during reciprocating transmission, reducing wear or deformation caused by uneven force. At the same time, it makes the power transmission of the adjusting assembly 5 more stable, further improving the adjustment accuracy and structural reliability of the bottom dead center compensation.

[0056] In a preferred embodiment, see [reference] Figure 3 The first shaft 56 has movable sliders 58 rotatably connected to both ends. The side wall of the bed 1 is provided with guide components corresponding to the movable sliders 58. The guide components include two parallel pads 11. The movable sliders 58 are embedded between the two pads 11 and are slidably connected to the two pads 11. Specifically, the movable sliders 58 have a rectangular block structure, and lubricating copper plates 581 are fixed at the top and bottom. Lubricating grooves are opened in the lubricating copper plates 581, and lubricating oil can be stored in the lubricating grooves to form a continuous lubricating oil film. By setting the lubricating copper plates 581, the frictional resistance between the movable sliders 58 and the sliders of the pads 11 is reduced, the smoothness of movement and the response sensitivity are improved, and the adjustment accuracy of the bottom dead center position of the main slider 3 is ensured.

[0057] In a preferred embodiment, see [reference] Figure 2 , 3 The main slider 3 is provided with four symmetrically arranged first guide sleeves 32, and the bed 1 is provided with four first guide posts 13 corresponding to the first guide sleeves 32. The four first guide posts 13 are respectively slidably engaged with the four first guide sleeves 32 to form a stable guiding structure, ensuring that the main slider 3 always makes a smooth reciprocating motion in the vertical direction.

[0058] In this embodiment, see Figure 3The main slider 3 is provided with two connecting posts 31, which are rotatably connected to the corresponding lower connecting rods 62. The bed 1 is fixedly provided with a third guide sleeve 12 corresponding to each of the connecting posts 31, and the connecting posts 31 are slidably connected to the third guide sleeves 12 in the vertical direction. The two connecting posts 31 are connected to the lower connecting rods 62 of the two connecting components in a one-to-one correspondence, so that the driving force on the main slider 3 is evenly distributed on both sides, avoiding tilting or uneven loading of the main slider 3 during the up and down movement, and ensuring that it always moves smoothly in the vertical direction; at the same time, the third guide sleeve 12 guides the connecting posts 31, further improving the straightness of the up and down movement of the main slider 3.

[0059] In this embodiment, see Figure 3 The balance block 2 is fixed with two symmetrically arranged second guide posts 21. The bed 1 is provided with second guide sleeves 14 that correspond one-to-one with the second guide posts 21. The second guide posts 21 and the second guide sleeves 14 are slidably connected to form the guiding structure of the balance block 2, ensuring that the balance block 2 remains stable when it moves synchronously with the main slider 3.

[0060] Please see Figure 8 The present invention also provides a bottom dead center dynamic compensation method, which is applied to the aforementioned bottom dead center dynamic compensation structure for a punch press. The bottom dead center dynamic compensation method includes the following steps:

[0061] 101. Obtain the preset bottom dead center position range and obtain the real-time bottom dead center position information of the main slider 3;

[0062] In this embodiment, a displacement sensor is provided on the main slide block 3, specifically a grating ruler sensor. The scale grating of the grating ruler sensor is fixed vertically to the bed 1, and the reading head is fixedly connected to the main slide block 3 and moves synchronously with it, enabling real-time acquisition of the instantaneous position data of the main slide block 3. The grating ruler sensor captures the actual position information of the main slide block 3 when it reaches the bottom dead center and transmits the position detection signal to the control system of the punch press in real time. The control system pre-stores a preset bottom dead center position range, which includes a minimum and a maximum value. The range is set after precise calculation based on the dimensional accuracy requirements and allowable processing error range of the stamped part. If the real-time bottom dead center position of the main slide block 3 is within the preset range, it indicates that the bottom dead center position of the main slide block 3 meets the process standard during the stamping process, and the processed product can meet the preset processing quality requirements. Its key indicators such as dimensional accuracy and geometric tolerances are all within the allowable processing error range.

[0063] 102. Compare the real-time bottom dead center position information with the preset bottom dead center position range, and determine the position deviation value based on the comparison result;

[0064] In this embodiment, after receiving the real-time bottom dead center position information of the main slide block 3 transmitted by the position detection sensor, the control system of the punch press accurately compares the real-time position data with the preset bottom dead center position range. If the real-time bottom dead center position information is within the preset bottom dead center position range, it is determined that the bottom dead center position of the main slide block 3 is without deviation, and no compensation action is required, that is, the two servo motors 54 do not generate any action; if the real-time bottom dead center position information is outside the preset bottom dead center position range, it indicates that the bottom dead center position of the main slide block 3 has deviated, and the compensation program needs to be started. The control system controls the two servo motors 54 to start according to the direction and magnitude of the deviation.

[0065] 103. Based on the position deviation value, adjust the rotation direction of the adjusting crankshaft 53 to move the main slider 3 up or down;

[0066] In this embodiment, the control system of the punch press controls the rotation direction of two servo motors 54 according to the calculated position deviation value and the determined deviation direction, driving the corresponding adjusting crankshaft 53 to rotate along the preset direction. This causes the third eccentric part 531 on the adjusting crankshaft 53 to deflect and pull or push the second connecting rod 52. The second connecting rod 52 drives the common hinge point of the first connecting rod 51 and the third connecting rod 55 to move up and down, thereby adjusting the included angle between them. This drives the first shaft 56 connected to the third connecting rod 55 to move horizontally synchronously towards or away from the bed 1. The first shaft 56 drives the main slide 3 to move up and down through the lower connecting rod 62, realizing dynamic compensation of the bottom dead center position. This ensures that the bottom dead center position of the main slide 3 returns to the preset bottom dead center position range during the next punching process. Throughout the compensation process, the control system monitors the position change of the main slide 3 in real time, forming a closed-loop feedback adjustment mechanism to continuously correct the deviation, effectively improving the repeatability of the bottom dead center positioning of the main slide 3, ensuring the accuracy stability and consistency of each punching operation, and thus ensuring that the dimensional accuracy of the stamped parts meets the process requirements.

[0067] In a preferred embodiment, the bottom dead center dynamic compensation method further includes:

[0068] 201. If the real-time bottom dead center position information is greater than the maximum value of the preset bottom dead center position interval, calculate the first position deviation value between the real-time bottom dead center position information and the maximum value of the preset bottom dead center position interval.

[0069] In this embodiment, this situation indicates that the main slider 3 has experienced an overshoot phenomenon during the stamping process, with its bottom dead center position exceeding the highest threshold required by the process. This overshoot will result in an excessive forming depth and dimensions exceeding the allowable error range of the stamped part, failing to meet the preset processing quality standards. At this time, the control system will calculate the difference between the real-time bottom dead center position and the maximum value of the preset range as the first position deviation value. This position deviation value directly reflects the degree of overshoot of the main slider 3, providing a quantitative adjustment basis for the subsequent servo motor 54 to drive the crankshaft 53 to rotate forward and push the main slider 3 upward for compensation. This ensures that the compensation action can accurately offset the overshoot deviation and bring the bottom dead center position back to the preset range.

[0070] 202. Based on the first position deviation value, control the two servo motors 54 to drive the corresponding adjustment crankshaft 53 to rotate, so that the second connecting rod 52 pushes the hinge point of the first connecting rod 51 and the third connecting rod 55 to move, causing the first shaft 56 to move away from the main crankshaft 4. The two first shafts 56 respectively drive the corresponding lower connecting rod 62 to swing upward, thereby driving the main slider 3 to move upward.

[0071] In this embodiment, the control system of the punch press controls two servo motors 54 to drive the corresponding adjusting crankshafts 53 to rotate synchronously in the forward direction according to the magnitude of the first position deviation value. It should be noted that since the two adjusting components 5 are arranged symmetrically along the axis of the main crankshaft 4, the two adjusting crankshafts 53 rotate in opposite directions, but their rotation angles are the same. Taking the adjusting component 5 located on the right side of the main crankshaft 4 as an example: when the adjusting crankshaft 53 rotates, its own third eccentric part 531 shifts upward synchronously, thereby pushing the second connecting rod 52 to move upward, causing the second shaft 57 to move upward synchronously. During the upward movement of the second shaft 57, the angle between the first connecting rod 51 and the third connecting rod 55 gradually increases, generating a thrust to both sides, which drives the first shaft 56, which is rotatably connected to the third connecting rod 55, to move smoothly along the bed 1 in a direction away from the main crankshaft 4. When the first shafts 56 on both sides move outward synchronously, they drive the corresponding lower connecting rods 62 to swing upward. The lower connecting rods 62, through rotational cooperation with the connecting column 31 of the main slider 3, convert the swinging force into a vertically upward driving force, which ultimately pushes the main slider 3 to move upward precisely, so that the bottom dead center position of the main slider 3 returns to the preset range during the next stamping, thereby improving the repeatability of the bottom dead center.

[0072] 301. If the real-time bottom dead center position information is less than the minimum value of the preset bottom dead center position interval, calculate the second position deviation value between the real-time bottom dead center position information and the minimum value of the preset bottom dead center position interval.

[0073] In this embodiment, the situation indicates that the main slider 3 has not moved to the target position required by the process during the stamping process, and its bottom dead center position is lower than the minimum threshold allowed by the process. This failure to reach the target position will result in insufficient forming depth and smaller key dimensions of the stamped part, failing to meet the preset processing accuracy requirements, and affecting the product's assembly adaptability and performance. At this time, the control system will calculate the difference between the real-time bottom dead center position and the minimum value of the preset interval as the second position deviation value. This position deviation value directly reflects the degree to which the main slider 3 has not reached the target position, providing a quantitative basis for the subsequent servo motor 54 to drive the crankshaft 53 to rotate in the opposite direction and push the main slider 3 downward to compensate, ensuring that the compensation amount and the deviation amount are completely matched, and realizing the correction of the bottom dead center position.

[0074] 302. Based on the second position deviation value, control the two servo motors 54 to drive the corresponding adjustment crankshafts 53 to rotate in the opposite direction, so that the second connecting rod 52 pushes the hinge point of the first connecting rod 51 and the third connecting rod 55 to move, thereby driving the first shaft 56 to translate in the direction of the main crankshaft 4. The two first shafts 56 respectively drive the corresponding lower connecting rods 62 to swing downward, thereby driving the main slider 3 to move downward.

[0075] In this embodiment, the control system of the punch press controls two servo motors 54 to drive the corresponding adjusting crankshafts 53 to rotate synchronously in opposite directions based on the magnitude of the second position deviation value. Specifically, taking the adjusting component 5 located on the right side of the main crankshaft 4 as an example: when the adjusting crankshaft 53 rotates in the opposite direction, its third eccentric part 531 shifts downward synchronously, thereby pulling the second connecting rod 52 downward, causing the second shaft 57 to move downward. During the downward movement of the second shaft 57, the angle between the first connecting rod 51 and the third connecting rod 55 gradually decreases, generating an inward pulling force, which drives the first shaft 56, rotatably connected to the third connecting rod 55, to smoothly translate along the bed 1 towards the main crankshaft 4. When the first shafts 56 on both sides move inward synchronously, they respectively drive the corresponding lower connecting rods 62 to swing downward. The lower connecting rods 62, through rotational cooperation with the connecting column 31 of the main slide block 3, convert the swinging force into a vertically downward driving force, ultimately pushing the main slide block 3 downward, so that the bottom dead center position accurately returns to the preset range, further ensuring the repeatability of the bottom dead center positioning of the main slide block 3 and the dimensional consistency of the stamped part.

[0076] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A dynamic compensation structure for the bottom dead center of a punch press, comprising a bed (1), a balance block (2) slidably connected to the bed (1) in the vertical direction, a main slide block (3) slidably connected to the bed (1) in the vertical direction, a main crankshaft (4) rotatably connected to the bed (1), and a transmission mechanism, wherein the main crankshaft (4) is connected to the balance block (2) and the main slide block (3) through the transmission mechanism to drive the balance block (2) and the main slide block (3) to perform synchronous reverse motion; characterized in that, The main crankshaft (4) includes a first eccentric portion (41) and a second eccentric portion (42). The transmission mechanism includes two adjusting components (5) and two transmission components (6). The two adjusting components (5) are respectively located on both sides of the axis of the main crankshaft (4), and the two adjusting components (5) are respectively corresponding to and movably connected with the first eccentric portion (41) and the second eccentric portion (42). The two transmission components (6) are respectively connected to the corresponding adjusting components (5), and each transmission component (6) is movably connected to the balance weight (2) and the main slider (3). The adjusting component (5) includes: A first connecting rod (51) whose one end is rotatably connected to the corresponding first eccentric portion (41) / second eccentric portion (42); A second connecting rod (52) whose one end is rotatably connected to the other end of the first connecting rod (51); An adjusting crankshaft (53) which is rotatably connected to the bed (1). The adjusting crankshaft (53) is provided with a third eccentric portion (531). The other end of the second connecting rod (52) is rotatably connected to the third eccentric portion (531). A servo motor (54) is provided at the input end of the adjusting crankshaft (53); A third connecting rod (55) whose one end is rotatably connected to the other end of the first connecting rod (51); a first shaft (56) is rotatably connected to the other end of the third connecting rod (55); the first shaft (56) is slidably connected to the bed (1) in the horizontal direction; The transmission component (6) includes: A balance connecting rod (61) whose one end is rotatably connected to the first shaft (56) and the other end is rotatably connected to the balance weight (2); A lower connecting rod (62) whose one end is rotatably connected to the first shaft (56) and the other end is rotatably connected to the main slider (3); The two servo motors (54) respectively drive the corresponding adjusting crankshafts (53) to rotate, driving the second connecting rods (52) to move synchronously, so as to adjust the included angle between the first connecting rod (51) and the third connecting rod (55), and further drive the two first shafts (56) to move synchronously towards or away from each other, and drive the main slider (3) to descend or ascend through the corresponding lower connecting rod (62), realizing the dynamic compensation of the bottom dead center position.

2. The dynamic compensation structure for the bottom dead center of a punch press according to claim 1, characterized in that, A second shaft (57) is fixedly provided at the end of the second connecting rod (52) far from the crankshaft, and the first connecting rod (51) and the third connecting rod (55) are respectively rotatably connected to the second shaft (57).

3. The dynamic compensation structure for the bottom dead center of a punch press according to claim 2, characterized in that, The first connecting rod (51), the second connecting rod (52) and the third connecting rod (55) form a "Y" - shaped structure.

4. The dynamic compensation structure for the bottom dead center of a punch press according to claim 2, characterized in that, The first connecting rod (51), the second connecting rod (52) and the third connecting rod (55) form a "one" - shaped structure.

5. The dynamic compensation structure for the bottom dead center of a punch press according to claim 1, characterized in that, There are two second eccentric portions (42). The two second eccentric portions (42) are symmetrically arranged on both sides of the first eccentric portion (41) and are not coaxially arranged with the first eccentric portion (41). The adjusting component (5) movably connected to the first eccentric portion (41) has one first connecting rod (51), and one end of this first connecting rod (51) is rotatably connected to the first eccentric portion (41); the adjusting component (5) movably connected to the second eccentric portion (42) has two first connecting rods (51), and one ends of the two first connecting rods (51) are respectively rotatably connected to the two second eccentric portions (42).

6. The dynamic compensation structure for bottom dead center of a punch press according to claim 1, characterized in that, The two ends of the first shaft (56) are rotatably connected to the movable slider (58). The side wall of the bed (1) is provided with guide components corresponding to the movable slider (58). The guide components include two parallel pads (11). The movable slider (58) is embedded between the two pads (11) and is slidably connected to the two pads (11).

7. The dynamic compensation structure for bottom dead center of a punch press according to claim 1, characterized in that, The main slider (3) is provided with two connecting columns (31), and the two connecting columns (31) are rotatably connected to the corresponding lower connecting rods (62); the bed (1) is fixedly provided with a third guide sleeve (12) corresponding to the connecting column (31) one by one, and the connecting column (31) is slidably connected to the third guide sleeve (12) in the vertical direction.

8. A dynamic compensation method for bottom dead center, characterized in that, The bottom dead center dynamic compensation method is applied to the bottom dead center dynamic compensation structure for a punch press as described in any one of claims 1-7, and the bottom dead center dynamic compensation method includes the following steps: Obtain the preset bottom dead center position range and obtain the real-time bottom dead center position information of the main slider (3); The real-time bottom dead center position information is compared with the preset bottom dead center position range, and the position deviation value is determined based on the comparison result; Based on the position deviation value, the rotation direction of the adjusting crankshaft (53) is adjusted to move the main slider (3) up or down.

9. The bottom dead center dynamic compensation method according to claim 8, characterized in that, The bottom dead point dynamic compensation method also includes: If the real-time bottom dead position information is greater than the maximum value of the preset bottom dead position interval, calculate the first position deviation value between the real-time bottom dead position information and the maximum value of the preset bottom dead position interval. Based on the first position deviation value, control the two servo motors (54) to drive the corresponding adjustment crankshaft (53) to rotate, so that the second connecting rod (52) pushes the hinge point of the first connecting rod (51) and the third connecting rod (55) to move, causing the first shaft (56) to translate away from the main crankshaft (4), and the two first shafts (56) respectively drive the corresponding lower connecting rod (62) to swing upward, thereby driving the main slider (3) to move upward; If the real-time bottom dead position information is less than the minimum value of the preset bottom dead position interval, calculate the second position deviation value between the real-time bottom dead position information and the minimum value of the preset bottom dead position interval. Based on the second position deviation value, control the two servo motors (54) to drive the corresponding adjustment crankshaft (53) to rotate in the opposite direction, so that the second connecting rod (52) pushes the hinge point of the first connecting rod (51) and the third connecting rod (55) to move, causing the first shaft (56) to translate in the direction of the main crankshaft (4), and the two first shafts (56) respectively drive the corresponding lower connecting rod (62) to swing downward, thereby driving the main slider (3) to move downward.

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