Segmented upper platen

Abstract

The application discloses a block type upper pressing tool seat and relates to the technical field of automatic bending equipment. The block type upper pressing tool seat comprises a rack and a plurality of bending units arranged in parallel along the length direction of the rack. The bending unit comprises a base, an upper pressing tool seat, a first driving device and an upper pressing tool. The base is fixedly installed on the rack. The first driving device is installed on the base. The upper pressing tool seat is installed on the base through a linear guide mechanism and is connected with the first driving device. A second driving device for pressing the upper pressing tool towards a workpiece is arranged on the upper pressing tool seat. The second driving device and the upper pressing tool are installed on the upper pressing tool seat. In addition, the block type upper pressing tool seat further comprises a control system which is electrically connected with the first driving device and the second driving device of each bending unit.

Description

Technical Field

[0001] This invention relates to the field of automatic bending equipment technology, and in particular to a segmented upper pressure knife holder. Background Technology

[0002] A CNC bending center is an automated device that uses program control to precisely bend metal sheets.

[0003] Traditional bending equipment typically suffers from the following drawbacks:

[0004] 1. When the sheet material to be bent is long, the pressure holder traditionally uses an integral or segmented rigid beam structure, with the driving power (e.g., servo motor, hydraulic cylinder) only located at both ends of the beam structure or a limited number of points. Pressure is mainly transmitted through both ends, resulting in a significant decrease in clamping force in the middle area of ​​the pressure beam. This causes uneven stress on the sheet material during bending, leading to larger bending errors and affecting bending accuracy.

[0005] 2. When processing sheet materials requiring different bending lengths, traditionally, operators need to manually change the integral pressure bar of different lengths or increase or decrease the number of segmented pressure blocks to accommodate the varying lengths of the sheet material. This increases the time and cost of manual tool adjustment. Furthermore, if the traditional pressure holder is damaged, the entire unit needs to be replaced, resulting in excessively high repair costs. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems by proposing a segmented upper pressure knife holder.

[0007] To achieve the above objectives, the following technical solution was adopted:

[0008] A segmented upper pressure knife holder includes a frame and several sets of bending units arranged side by side along the length of the frame. Each bending unit includes a base, an upper pressure knife holder, a first driving device, and an upper pressure knife. The base is fixedly mounted on the frame, the first driving device is mounted on the base, and the upper pressure knife holder is mounted on the base via a linear guide mechanism and connected to the first driving device. The upper pressure knife holder is provided with a second driving device for pressing the upper pressure knife against the workpiece to be bent. The second driving device and the upper pressure knife are mounted on the upper pressure knife holder. In addition, a control system is included, which is electrically connected to the first driving device and the second driving device of each bending unit.

[0009] The control system pre-stores a predetermined working range for each bending unit along the length direction of the frame, and the control system is configured to: acquire the length of the workpiece to be bent and its positioning coordinates along the length direction of the frame, and calculate the target range of the required bending area on the frame based on the length and positioning coordinates of the workpiece to be bent; compare the target range with the predetermined working range of each bending unit; and based on the comparison result, control the bending unit corresponding to the predetermined working range to perform the bending operation as the target working unit.

[0010] Furthermore, several sets of bending units are independently arranged on the frame, and a certain interval is left between adjacent bending units to ensure that the lifting and lowering movements between adjacent bending units do not affect each other in terms of mechanical structure.

[0011] Furthermore, the first driving device includes a servo motor and a lead screw that converts the rotational motion of the servo motor into linear motion. The servo motor drives the upper pressure tool holder to move up and down along the linear guide mechanism via the lead screw.

[0012] Furthermore, the second drive device employs a cylinder assembly, the cylinder body of which is fixedly mounted on the upper pressure knife seat, and its piston rod is connected downwards to or pressed against the upper pressure knife.

[0013] Furthermore, the upper pressure knife is detachably mounted on the upper pressure knife holder or the second drive device, the second drive device being configured to provide a flexible clamping force after the upper pressure knife contacts the workpiece.

[0014] Furthermore, based on the comparison results, the bending unit corresponding to the predetermined working area is controlled, and the specific judgment logic includes:

[0015] Let the predetermined working interval of the i-th bending unit be {Ai,Bi}, and the target interval be {C,D}. Then, the bending unit whose predetermined working interval satisfies Bi≥C and Ai≤D is determined to be the target working unit.

[0016] Furthermore, the control system is also configured to control the first drive device of all the target working units to perform synchronous lifting and lowering movements during the bending process.

[0017] Furthermore, during the pressing stage, the second drive device of the bending unit of the target working unit is independently controlled according to the preset pressure value so that each upper pressure knife applies a corresponding pressing force.

[0018] Furthermore, each of the bending units is also provided with a sensor for detecting pressure, the sensor being electrically connected to the control system, and the control system being configured to control the pressure of the second drive device corresponding to the bending unit based on the feedback value of each of the sensors.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention sets up multiple bending units that can be independently controlled by the system, so that the upper pressure knife holder can automatically activate the corresponding number of modules according to the input material size information, thereby realizing the self-adaptation of the pressing length. This solves the problems of low machine adjustment efficiency and insufficient production flexibility caused by the need for manual replacement of pressure knife blocks due to changes in the length of the material in traditional structures.

[0021] 1. This invention configures each bending unit with an independent second driving device (e.g., a cylinder) and a pressure closed-loop control system, so that the pressure of each upper pressure knife can be independently monitored and dynamically adjusted, thereby achieving a uniform and stable clamping force distribution along the entire length of the bending line, preventing uneven pressure and poor bending accuracy caused by the traditional two-end driving method when processing long plates.

[0022] 2. By adopting modular bending units, which are independent of each other, this invention allows for quick isolation or replacement of any bending unit in case of failure, thereby greatly improving the maintainability and availability of the equipment and reducing the loss of the entire machine downtime due to partial failure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the segmented upper pressure knife holder of the present invention;

[0024] Figure 2 This is a schematic diagram of the bending unit of the segmented upper pressure knife holder of the present invention;

[0025] Figure 3 This is a schematic diagram of the control circuit for the segmented upper pressure knife holder of the present invention;

[0026] Reference numerals in the attached drawings: 1. Frame; 2. Bending unit; 21. Sensor; 3. Base; 4. Upper pressure knife holder; 5. First drive device; 51. Servo motor; 52. Lead screw; 6. Upper pressure knife; 7. Linear guide mechanism; 8. Second drive device; 9. Control system; Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0028] like Figures 1-3As shown, this embodiment provides a segmented upper pressure knife holder, including a frame 1, several sets of bending units 2 arranged side by side along the length of the frame 1, and a control system 9.

[0029] Each bending unit 2 is mechanically a completely independent drive module. For example... Figure 2 As shown, the bending unit 2 specifically includes a base 3, an upper pressure knife seat 4, a first driving device 5, and an upper pressure knife 6.

[0030] The base 3 is fixedly mounted on the frame 1 by high-strength bolts, which is used to securely connect the bending unit 2 to the frame 1.

[0031] In this embodiment, the first driving device 5 includes a servo motor 51 and a lead screw 52. The servo motor 51 is fixedly mounted on the side of the base 3 via a motor mount, providing power for driving the bending unit 2 to rise and fall. The lead screw 52 is rotatably supported on the base 3 via a bearing seat and is directly connected to the output shaft of the servo motor 51 via a coupling, thereby converting the rotational motion of the servo motor 51 into linear motion to control the rising and falling of the upper pressure knife holder 4.

[0032] In this embodiment, a high-precision linear guide rail is used as the linear guiding mechanism 7. The guide rail portion of the linear guide rail is fixedly mounted on the base 3. A slider matching the guide rail is provided on the back of the upper pressure tool holder 4, so that the upper pressure tool holder 4 can be slidably mounted on the base 3 and can perform precise linear movement along the guide rail direction. A nut that cooperates with the lead screw 52 is embedded inside the upper pressure tool holder 4, so that the upper pressure tool holder 4 can be driven by the servo motor 51 and perform high-precision vertical lifting and lowering movement along the linear guiding mechanism 7.

[0033] Furthermore, a second driving device 8 is also provided on the upper pressure knife holder 4. In this embodiment, the second driving device 8 is a standard cylinder, and its cylinder body is vertically fixed to the front end face of the upper pressure knife holder 4 by bolts.

[0034] The upper pressure knife 6 is detachably mounted on the lower end of the piston rod of the upper pressure knife seat 4 or the second drive device 8. When the piston rod of the second drive device 8 extends, it can press the upper pressure knife 6 downward onto the workpiece to be bent.

[0035] In this embodiment, when the base 3 of each bending unit 2 is installed on the frame 1, each bending unit 2 is structurally independently set on the frame 1, and a design gap is left between adjacent bending units. Moreover, the lifting movement of each upper pressure knife seat 4 is driven independently by the first driving device 5 of the bending unit, so as to ensure that the lifting movement between adjacent bending units (2) does not affect each other mechanically.

[0036] In this embodiment, all electrical lines and air ducts of the CNC bending center are arranged in a regular manner through cable chains or flexible conduits to ensure that the moving parts move freely and safely.

[0037] In this embodiment, the control system 9 employs an industrial-grade programmable PLC controller. It is responsible for receiving instructions from the upper-level digital control system or human-machine interface, such as sheet metal dimensions, bending line positions, and process parameters, and executing the core control logic. Figure 3 As shown, the control system 9 is electrically connected to the first drive device 5 and the second drive device 8 of each bending unit 2, thereby precisely controlling the movement of each set of drive devices.

[0038] The control system 9 pre-stores a predetermined working range {Ai, Bi} for each bending unit 2 along the length of the frame. This predetermined working range is determined by extending half the effective working width of the unit to both sides from the center of the bending unit. In this embodiment, the predetermined working range of each bending unit 2 is calibrated and stored in the control system 9 according to its physical installation position before the equipment leaves the factory, and the effective working width is set to 150mm. When the operator inputs the length L of the workpiece to be bent and its positioning coordinates X on the frame through the human-machine interface (HMI) at the bending center, the control system 9 executes the following logic:

[0039] First, obtain the length L of the workpiece to be bent and its positioning coordinate X along the length direction on the frame 1. Then, calculate the target interval {C,D} of the required bending area on the frame 1 based on the length L and positioning coordinate X of the workpiece to be bent, where C=XL / 2 and D=X+L / 2.

[0040] Secondly, the predetermined working interval {Ai,Bi} of each bending unit 2 is traversed, and the predetermined working interval {Ai,Bi} is compared with the target interval {C,D} to determine whether the predetermined working interval {Ai,Bi} of the corresponding bending unit i overlaps with the target interval {C,D}. The judgment criterion is: the two intervals are considered to overlap if and only if Bi≥C and Ai≤D are both true, that is, the predetermined working interval {Ai,Bi} of the current bending unit 2 is within the target interval {C,D}. This judgment logic ensures that any bending unit 2 that intersects with the workpiece clamping area will be selected.

[0041] Finally, the control system 9 marks all bending units 2 that meet the above overlap conditions as target working units and generates an activation list. Units not in the list will not be activated.

[0042] The control system 9 is also configured to: during the clamping stage, the control system 9 independently controls the second drive device 8 of the bending unit 2, which is determined to be the target working unit, according to the preset pressure value p, so that each upper pressure knife 6 applies a corresponding clamping force to the workpiece to be bent.

[0043] Furthermore, each bending unit 2 is also provided with a sensor 21 for detecting pressure, and the sensor 21 is electrically connected to the control system 9. The control system 9 can perform closed-loop control on the corresponding second drive device 8 based on the actual pressure value P fed back by the sensor 21 on each bending unit 2 that is determined to be a target working unit, so that the actual pressure value detected by the sensor 21 approaches the preset pressure value.

[0044] The workflow is as follows:

[0045] After the operator inputs workpiece information and processing instructions through the human-machine interface, the control system 9 parses the length L of the workpiece to be bent and its positioning coordinates X on the machine tool. Subsequently, based on this length information, the control system 9 intelligently selects the bending unit 2 covering the required clamping area as the target working unit, and sends a synchronous control signal to the first drive device 5 of these selected bending units 2, controlling the first drive device 5 of the bending unit 2 to drive the tool holder 4 to move up and down on the base 3, entering the bending stage.

[0046] Furthermore, the upper pressure blades 6 of all activated bending units 2 move downwards at the same speed and acceleration. During this process, the control system 9 continuously monitors and compares the position tracking errors of the first drive devices 5 of all target working units. When the actual position tracking error of any first drive device 5 is large or its absolute value exceeds a preset synchronization tolerance threshold, the control system 9 can immediately issue an alarm or actively adjust, thereby ensuring that the lower surfaces of all participating upper pressure blades 6 are essentially at the same horizontal plane before contacting the workpiece to be bent. In this embodiment, the synchronization tolerance threshold is set to ±0.05mm.

[0047] After the upper pressure blade 6 contacts the workpiece sheet to be bent, the downward pressure of the first drive device 5 encounters resistance. The control system 9 determines that the pressing stage has begun, and the first drive device 5 enters the position holding mode to provide rigid support for the upper pressure blade 6. The control system 9 then controls the second drive device 8 of the corresponding bending unit 2 to drive the upper pressure blade 6 to move according to the preset pressure value p, applying pressure to the workpiece to be bent and pressing and fixing the workpiece in place.

[0048] Sensors 21 on bending unit 2 monitor the actual pressure value P applied by the upper pressure knife 6 in real time and feed it back to control system 9. Control system 9 compares the actual pressure value P fed back by each sensor 21 with a preset pressure value p, and independently runs a PID closed-loop control algorithm for each target working unit to dynamically adjust the output pressure of the second drive device 8, so that the actual pressure value P gradually stabilizes within the allowable error range of the preset pressure value p. Specifically, the PID closed-loop control algorithm calculates a control signal by comparing the preset pressure value p with the actual pressure value P fed back by the sensors, and adjusts the opening of the proportional valve of the second drive device, so that the actual pressure value P quickly approaches and stabilizes at the preset pressure value p. In this embodiment, the error range is set to ±3% of the preset pressure value p to ensure uniform pressure distribution along the entire bending line and avoid uneven pressure distribution due to excessively long workpieces to be bent.

[0049] During the bending process, the thickness and state of the workpiece to be bent will change. At this time, the control system 9 continuously adjusts the pressure of each second drive device 8 in real time to maintain the constant clamping force of the upper pressure knife 6, thereby effectively suppressing the slippage or local warping of the workpiece during the bending process.

[0050] After the bending action is completed, the control system 9 controls the second drive device 8 to depressurize and rise, and then controls all activated first drive devices 5 to rise synchronously, so that the upper pressure knife seat is reset to a safe position.

[0051] This embodiment constructs a novel upper pressure tool holder through a modular, independently driven mechanical architecture. This design, through intelligent selection and control of the bending unit 2 by the control system 9, achieves rapid adaptive adjustment of the clamping length, solving the problem of time-consuming manual tool adjustment in traditional methods, and significantly improving production efficiency and flexibility. Simultaneously, each bending unit 2 is equipped with an independent first drive unit 5 and a second drive unit 8, achieving uniform pressure distribution along the entire bending line and avoiding the loss of bending accuracy due to uneven pressure. Furthermore, since each bending unit 2 is independent of the others, even if a partial damage occurs in one bending unit 2, it can continue to operate by replacing the damaged part, greatly reducing maintenance costs and time.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of this application. Those skilled in the art may find other optimizations and additional functions in this application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A segmented upper pressure knife holder, characterized in that: The device includes a frame (1) and several sets of bending units (2) arranged side by side along the length of the frame (1). Each bending unit (2) includes a base (3), an upper pressure knife holder (4), a first drive device (5), and an upper pressure knife (6). The base (3) is fixedly installed on the frame (1). The first drive device (5) is installed on the base (3). The upper pressure knife holder (4) is installed on the base (3) through a linear guide mechanism (7) and is connected to the first drive device (5). The upper pressure knife holder (4) is provided with a second drive device (8) for pressing the upper pressure knife (6) against the workpiece to be bent. The second drive device (8) and the upper pressure knife (6) are installed on the upper pressure knife holder (4). In addition, the device includes a control system (9). The control system (9) is electrically connected to the first drive device (5) and the second drive device (8) of each bending unit (2). Each bending unit (2) is also provided with a sensor (21) for detecting pressure, the sensor (21) being electrically connected to the control system (9); the control system (9) is also configured to: perform closed-loop control on the corresponding second drive device (8) based on the actual pressure value fed back by the sensor (21) on each bending unit (2) as a target working unit, so that the actual pressure value detected by the sensor (21) approaches the preset pressure value; The control system (9) pre-stores a predetermined working range for each bending unit (2) along the length direction of the frame (1), and the control system (9) is configured to: obtain the length of the workpiece to be bent and its positioning coordinates along the length direction of the frame (1), and calculate the target range of the required bending area on the frame (1) based on the length and positioning coordinates of the workpiece to be bent; compare the target range with the predetermined working range of each bending unit (2); and based on the comparison result, control the bending unit (2) corresponding to the predetermined working range to perform the bending operation as the target working unit. The control system (9) is also configured to: during the pressing stage, independently control the second drive device (8) of the bending unit (2) of the target working unit according to a preset pressure value so that each upper pressure knife (6) applies a corresponding pressing force.

2. The segmented upper pressure knife holder as described in claim 1, characterized in that: Each bending unit (2) is independently arranged on the frame (1), and there is a certain interval between adjacent bending units (2) to ensure that the lifting and lowering movements between adjacent bending units (2) do not affect each other in terms of mechanical structure.

3. The segmented upper pressure knife holder as described in claim 1, characterized in that: The first driving device (5) includes a servo motor (51) and a lead screw (52) that converts the rotational motion of the servo motor (51) into linear motion. The servo motor (51) drives the upper pressure knife holder (4) to move up and down along the linear guide mechanism (7) through the lead screw (52).

4. The segmented upper pressure knife holder as described in claim 1, characterized in that: The second drive device (8) adopts a cylinder assembly, the cylinder of which is fixedly mounted on the upper pressure knife seat (4), and its piston rod is connected downward to or pressed against the upper pressure knife (6).

5. The segmented upper pressure knife holder as described in claim 1, characterized in that: The upper pressure knife (6) is detachably mounted on the upper pressure knife seat (4) or the second drive device (8), which is configured to provide a flexible clamping force after the upper pressure knife (6) contacts the workpiece.

6. The segmented upper pressure knife holder as described in claim 1, characterized in that: Based on the comparison results, the bending unit (2) corresponding to the predetermined working area is controlled. The specific judgment logic includes: Let the predetermined working interval of the i-th bending unit (2) be {Ai,Bi}, and the target interval be {C,D}. Then the bending unit (2) whose predetermined working interval satisfies Bi≥C and Ai≤D is determined to be the target working unit.

7. The segmented upper pressure knife holder as described in claim 1, characterized in that: The control system (9) is also configured to control the first drive unit (5) of all the target working units to perform synchronous lifting and lowering movements during the bending process.

Images