A press machine die loading height self-adaptive adjusting system and self-adaptive adjusting method thereof

Abstract

The present application relates to a kind of press machine moulding height self-adapting adjustment system and its self-adapting adjustment method in press machine technical field, wherein, self-adapting adjustment system includes transmission mechanism, adjusting motor, laser ranging sensor, absolute value encoder installed in transmission mechanism, motor protector, contactor one, contactor two and main controller, absolute value encoder is connected with main controller, for the transmission information of transmission mechanism is collected, contactor one and contactor two are used to control the forward rotation and reverse rotation of adjusting motor to drive sliding to ascend or descend, laser ranging sensor, absolute value encoder, motor protector, contactor one, contactor two are connected with main controller signal, main controller passes through laser ranging sensor and absolute value encoder acquisition information, calculates the suitable operation trajectory, and completes the operation trajectory by motor protector, contactor one and contactor two control transmission mechanism, realizes the self-adapting adjustment of moulding height.

Description

Technical Field

[0001] This invention relates to the field of press technology, and in particular to a press die height adaptive adjustment system and method. Background Technology

[0002] To accommodate molds of different heights, the press slide is equipped with a mold mounting height adjustment mechanism, such as... Figure 1 As shown, the system includes an adjusting motor 101 connected to a reducer via a coupling 102. The reducer is a worm gear reducer. The adjusting motor 101 drives a worm gear 103, which in turn drives a worm wheel 104. The worm wheel 104 has a central hole with an inner sleeve inside. A ball-end screw 106 is synchronously fitted at the center of the inner sleeve. The ball-end screw 106 is connected to the inner sleeve via a synchronizing pin. The other end of the ball-end screw 106 has a trapezoidal thread that engages with a threaded sleeve inside the slider to achieve the lifting and lowering movement of the slider, thereby adjusting the mold height. During press stamping, the mold precision requirements are extremely high. Therefore, when the mold height adjustment is finally completed, the error between the current value of the slider mold height and the mold height should be less than 0.1 mm.

[0003] Existing technologies for adjusting mold mounting height include two methods. One is manual adjustment, which involves measuring the actual height of the mold with a tape measure and then manually controlling the forward and reverse rotation of the adjustment motor to adjust the mold mounting height of the press. This method allows for repeated manual adjustments to ensure that the slider mounting height is perfectly aligned with the mold height, but it is inefficient, has a low degree of automation, and relies entirely on the operator's experience. Another method involves using a stored mold mounting height from a mold library for adjustment. The disadvantages of this method are: it cannot prevent user error, such as storing or retrieving incorrect mounting heights, which could damage the mold; furthermore, during automatic adjustment, external factors such as changes in the weight of the upper mold, fluctuations in the balancer's air pressure, gear backlash in the transmission, and reduced braking efficiency of the motor braking device can prevent the mold mounting height from being stopped within the allowable error range of 0.1mm. Summary of the Invention

[0004] This invention addresses the problems existing in the adjustment of die height in existing press technologies by providing an adaptive die height adjustment system for presses. This system enables automatic measurement, data feedback, and calibration of the die height to avoid errors in manual operation and measurement deviations, thereby achieving automated and precise adjustment of the die height and high-precision stamping.

[0005] The above-mentioned objective of this invention is achieved as follows: a press mold mounting height adaptive adjustment system includes a transmission mechanism for adjusting the mold mounting height of the slide block, an adjustment motor, a laser rangefinder sensor embedded in the lower surface of the press slide block, an absolute encoder installed in the transmission mechanism, a motor protector installed in the electrical cabinet, contactor one, contactor two, and a main controller. The absolute encoder is communicatively connected to the main controller and is used to collect transmission information of the transmission mechanism. Contactor one and contactor two are used to control the forward and reverse rotation of the adjustment motor to drive the slide block to rise or fall. The laser rangefinder sensor, absolute encoder, motor protector, contactor one, and contactor two are connected to the main controller via a communication network port and input / output signal points. The main controller calculates a suitable running trajectory based on the mold mounting height and the current height information of the slide block collected by the laser rangefinder sensor and absolute encoder, and controls the transmission mechanism to complete the running trajectory through the motor protector, contactor one, and contactor two, thereby realizing adaptive adjustment of the mold mounting height.

[0006] The above-mentioned adaptive mold height adjustment system for presses of the present invention adds a laser rangefinder to the original mold height adjustment mechanism to monitor the slider height. The position of the adjustment mechanism is controlled by exchanging information with the main controller through an absolute encoder. The main controller can calculate the adjustment information based on the monitored height of the laser rangefinder and the information of the absolute encoder, and use it to control the action of contactor one and contactor two, thereby realizing adaptive mold height adjustment, realizing programmed and automated adjustment, and avoiding deviations and errors caused by manual adjustment.

[0007] Furthermore, the laser rangefinder sensor is installed in the middle area of ​​the lower plane of the press slide, and after being embedded, it is flush with the lower plane of the slide. It is used to collect the current height of the mold in real time and feed it back to the main controller so as to accurately monitor and adjust the status.

[0008] Furthermore, the absolute encoder is connected to the synchronous signaling device inside the slider and is also connected to the main controller signal, transmitting the position information of the transmission mechanism to the main controller in real time. The main controller then calculates the current mold height adjustment position of the press.

[0009] Furthermore, the motor protector is equipped with auxiliary contacts to feed back the overload, short circuit, phase loss, locked rotor, and three-phase imbalance status of the motor to the main controller for protection of the motor control circuit. The motor protector is also used to control the power supply of contactor one and contactor two to facilitate the control of the lifting and lowering movement of the mold height adjustment.

[0010] To facilitate the output and display of control results, the main controller is also connected to a touch screen for displaying the press's mold mounting height operating status, the current actual height of the mold, and the current mold mounting height of the press.

[0011] The present invention further provides an adaptive adjustment method based on the above press die height adaptive adjustment system, which includes a calibration mode and a die adjustment mode, wherein the calibration mode and the die adjustment mode are controlled by operation through a touch screen, First, the calibration mode is performed through the touch screen, the main controller automatically drives the slide block to the bottom dead center, the laser ranging sensor is used to measure the distance value from the current lower surface of the slide block to the workbench, which is taken as the current die height, and the value is transmitted to the main controller, the main controller calibrates the absolute value encoder according to the above value, and then automatically returns to the top dead center to complete the calibration mode; Then entering the die adjustment mode includes the following steps: Step 1) Measurement of die height: before loading the die, the slide block of the press is operated to the top dead center, the laser ranging sensor measures the height m from the lower plane of the press slide block to the workbench of the press, after loading the die, the laser ranging sensor measures the height n from the lower plane of the press slide block to the upper plane of the upper die of the die, and the theoretical height of the die a = m - n is calculated by the controller; the main controller reads the current value of the absolute encoder as the current die height b.

[0012] Step 2) The main controller adjusts the die height according to the values of a and b, which is divided into a rising process and a falling process: when a > b, the rising process adjustment is performed, the controller sends a signal to control the first contactor to pull in and make the adjustment motor rotate forward, and the laser ranging sensor adaptively measures the height of the slide block at the same time, when the height of the slide block rises to the position of a+2mm, the adjustment motor stops for 1 second, then adjusts downward to a, and stops the die adjustment; when a < b, the main controller controls the second contactor to pull in and make the adjustment motor rotate reversely, the slide block descends, the die height decreases, and when the die height is adjusted to a, the adjustment stops; when a = b, no adjustment is performed.

[0013] Further, in order to ensure that the die height can be accurately stopped at the preset position during the die height adjustment, and compensate the braking distance of the brake of the die height adjustment motor, during the die height adjustment in step 2), when the adjustment motor rotates reversely to make the slide block descend, when the height position of the slide block is at the position of a+d, the main controller sends a braking signal to the adjustment motor to make the adjustment motor start braking, and the slide block finally stops at the position a, where d is the descending braking distance of the adjustment motor to the slide block.

[0014] During long-term use of the press, it is often necessary to replace the mold and readjust the mold mounting height. Due to external factors such as changes in the weight of the upper mold, fluctuations in the air pressure of the balancer, gear backlash between transmissions, and reduced braking efficiency of the motor braking device, the braking distance d of the motor for adjusting the mold mounting height will change. This will cause the mold mounting height to not stop precisely at the target position during adjustment. To avoid the above problems, after the initial adjustment in step 2), the difference g between the current mold mounting height b' of the slider and the target height a, where g = b' - a, will be used. When g > 0.1 mm or g < -0.1 mm, the readjustment process will be initiated: the main controller will recalculate the braking distance d', d' = dg, and control the adjusting motor to rotate forward and raise the slider to position a+2 through contactor one. Then, control the adjusting motor to descend through contactor two, and lower it again according to the braking distance d' to stop the slider at the target position. This process continues until -0.1 mm ≤ g ≤ 0.1 mm, confirming that the mold mounting height has been adjusted to the target value, and the adjustment process ends.

[0015] Furthermore, if the mold height adjustment difference g still cannot be stopped within the range of [-0.1mm, 0.1mm] after three repeated readjustment processes, the mold height adjustment process will be stopped, the sliding will be braked, and a fault alarm will be triggered. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the transmission device of the mold height adjustment system of the present invention.

[0017] Figure 2 This is a schematic diagram of the press mold mounting height adaptive adjustment system of the present invention.

[0018] Figure 3 This is a control block diagram of the press mold mounting height adaptive adjustment system of the present invention.

[0019] Among them, 101 is the adjusting motor; 102 is the coupling; 103 is the worm gear; 104 is the worm wheel; 105 is the inner sleeve; 106 is the ball screw; 107 is the worm wheel seat; 2 is the absolute encoder; 3 is the slider; 4 is the laser rangefinder; 5 is the mold; 6 is the press worktable; 7 is the main controller; 8 is the motor protector; 9 is contactor one; 10 is contactor two; 11 is the touch screen. Detailed Implementation Example 1

[0020] like Figure 1 — Figure 3 The adaptive adjustment system for the mold mounting height of the press implemented herein includes a transmission mechanism 1 for adjusting the mold mounting height of the slide block. The transmission mechanism 1 is as follows: Figure 1As shown, the system includes an adjusting motor 101 and a reducer. The reducer includes a worm gear seat 107, in which a worm gear 104 is rotatably mounted. The worm gear 104 is connected to a worm 103 via a transmission connection. The adjusting motor 101 is connected to the worm 103 via a coupling 102. The worm 103 drives the worm gear 104. The worm gear 104 has a central hole at its center, and a synchronously rotating inner sleeve 105 is installed inside the central hole. A ball head screw 106 is connected to the center of the inner sleeve 105 via a radial pin. The threaded section of the ball head screw 106 is guided and connected to a threaded sleeve installed inside the slider 3, which can drive the slider 3 to move up and down. To drive the slider 3 smoothly, two sets of worm gear mechanisms are synchronously provided and driven synchronously by the adjusting motor 101, which can smoothly realize the lifting and lowering adjustment of the slider. Figure 2 As shown, a laser rangefinder 4 is installed on the lower surface of the press slide 3. An absolute encoder 2, a motor protector 8, a contactor 9, and a main controller 7 are installed at the end of the worm gear in the transmission mechanism 1 via a flexible coupling. The absolute encoder 2 is communicatively connected to the main controller 7 and is used to collect the transmission information of the transmission mechanism 1, mainly the rotational speed and running position information of the worm gear. This information is fed back to the main controller 7 to calculate the position information of the slide 3 based on the transmission ratio, which is used for the control output of the main controller 7. Contactors 9 and 10 are used to control and adjust the forward and reverse rotation of the motor 101 to drive the slide 3 to rise or fall. The laser rangefinder 4, absolute encoder 2, motor protector 8, contactors 9 and 10 are connected to the communication network port and input / output points of the main controller 7. The main controller 7 calculates a suitable running trajectory based on the mold height and the current height information of the slide 3 collected by the laser rangefinder 4 and absolute encoder 2, and controls the actuator through the motor protector 8, contactors 9 and 10 to complete the above trajectory, so as to realize the adaptive adjustment of the mold height.

[0021] like Figure 2 As shown, the laser rangefinder 4 is installed in the middle area of ​​the lower plane of the press slide 3. After installation, it is flush with the lower plane of the slide. It is used to collect the current height of the slide 3 in real time and feed it back to the main controller 7 so as to accurately monitor the adjustment status of the mold height.

[0022] The absolute encoder 2 is connected to the synchronous signaling device inside the slider and is signal-connected to the main controller 7. It transmits the position information of the transmission mechanism 1 to the main controller 7 in real time, and the main controller 7 calculates the current mold height adjustment position information of the press.

[0023] To ensure the safety of the motor, the motor protector 8 is equipped with auxiliary contacts to feed back the overload, short circuit, phase loss, locked rotor, and three-phase imbalance status of the motor 101 to the main controller 7 for protection of the motor 101 control circuit. The motor protector 8 is also used to control the power supply to contactor 9 and contactor 10 to facilitate the control of the lifting and lowering movement of the mold height adjustment.

[0024] To facilitate the output and display of control results, the main controller 7 is also connected to a touch screen 11, which is used to display the operating status of the press mold height, the actual height of the current mold, and the current mold height of the press.

[0025] The adaptive mold mounting height adjustment system of the press described in this embodiment, based on the original mold mounting height adjustment mechanism, adds a laser range sensor 4 to the lower side of the slider 3 to monitor the height of the slider. The position information of the transmission mechanism and the slider is fed back through information exchange between the absolute encoder 2 and the main controller 7. The main controller 7 can calculate the adjustment information based on the monitored height of the laser range sensor 4 and the information of the absolute encoder 2, and use it to control the action of contactor 9 and contactor 10, thereby realizing adaptive mold mounting height adjustment, realizing programmed and automated adjustment, and avoiding deviations and errors caused by manual adjustment. Example 2

[0026] Based on the press mold height adaptive adjustment system of Embodiment 1, this invention provides a press mold height adaptive adjustment method based on the above system, including a calibration mode and a mold adjustment mode. The calibration mode and the mold adjustment mode are controlled by touch screen operation. First, the calibration mode is performed through the touch screen. The main controller automatically drives the slider to the bottom dead center and uses a laser range sensor to measure the distance from the lower surface of the slider to the worktable as the current mold height. This value is then transmitted to the main controller. The main controller calibrates the absolute encoder according to the above value and then automatically returns to the top dead center to complete the calibration mode.

[0027] Then enter the model adjustment mode, which includes the following steps: Step 1) Measurement of mold height: Before loading the mold, move the press slide 3 to the top dead center. The laser range sensor 4 measures the height m from the lower plane of the slide 3 to the press worktable 6. After loading the mold, the laser range sensor 4 measures the height n from the lower plane of the press slide to the upper plane of the mold. The theoretical height a=mn of the mold is calculated by the controller. The main controller reads the current value of the absolute encoder as the current mold loading height b.

[0028] Step 2) The main controller adjusts the die height according to the magnitudes of values a and b, which is divided into a rising process and a falling process: when a>b, the rising process adjustment is carried out, the controller sends a signal to control the first contactor to pull in to make the adjustment motor rotate in the forward direction, and the laser ranging sensor adaptively measures the die height at the same time. In order to eliminate the influence on the braking distance caused by the decrease of the balance cylinder air pressure and the increase of the gear clearance between transmissions during upward adjustment, and also to unify the braking direction, when the die height is adjusted to a, it will not stop, but continue to adjust upward to a+2mm. After the adjustment motor stops for 1 second, it then adjusts downward to a and stops the die adjustment; when a<b, the main controller controls the second contactor to pull in to make the adjustment motor rotate in the reverse direction, the slide block descends, and the die height decreases. When the die height is adjusted to a, the adjustment stops; when a=b, no adjustment is performed. In this step, whether in the adjustment of the rising process or the adjustment of the falling process, when the slide block descends to the position a+d (where d is the braking distance of the adjustment motor), the main controller 7 sends a braking signal to start braking, and finally the slide block stops at b'.

[0029] During the long-term use of the press, it is often necessary to replace the mold and readjust the die height. Due to external factors such as the change of the weight of the upper mold, the fluctuation of the balancer air pressure, the gear clearance between transmissions, and the reduction of the braking efficiency of the motor braking device, the braking distance d of the adjustment motor 101 will change, resulting in the failure to stop accurately at the target position during the die height adjustment. To avoid the above problems, when the slide block stops at the position b' after each adjustment, the main controller compares the difference between b' and the target position a, that is, g = b'-a. When g>0.1mm or g<-0.1mm, the main controller starts a re-adjustment process: recalculate the braking distance d', where d'=d-g, and control the adjustment motor 101 to rotate forward through the first contactor 9 to lift the slide block to the position a+2mm, then control the adjustment motor 101 to descend through the second contactor 10, descend again according to the braking distance d' and make the slide block stop at the target position, until -0.1mm≤g≤0.1mm, it is confirmed that the die height is adjusted to the target value, and the adjustment process ends. At the same time, in order to avoid frequent automatic correction caused by faults occurring during the adjustment process, after the re-adjustment process is started three times and the die height adjustment process in step 3) is completed, if the g value still cannot fall within the range of [-0.1mm, 0.1mm], the die height adjustment process is stopped, the slide block is braked, and a fault alarm is triggered at the same time.

[0030] The adaptive mold height adjustment method described in this embodiment comprehensively considers the changes in braking distance caused by external factors such as errors in manually entering the current mold height target value, fluctuations in balancer air pressure after long-term use, gear clearance between transmissions, and reduced braking efficiency of the adjustment motor braking device. It uses the laser rangefinder 4 to measure and the main controller 7 to automatically calculate the current mold height as the target value. Furthermore, if the mold height value is not within the target range when the automatic adjustment stops, the braking distance will be automatically corrected based on the actual situation. The number of automatic correction cycles is limited to avoid frequent automatic corrections due to malfunctions during adjustment. If, after restarting the adjustment process and three correction cycles, the g value still cannot stop within the range of [-0.1mm, 0.1mm], it is determined that the adaptive adjustment process cannot be completed, the automatic adjustment action is stopped, and the slider operation is prohibited, thereby ensuring the safety of the automatic mold height adjustment and triggering timely alarms for maintenance.

Claims

1. An adaptive adjustment method based on a press mold height adaptive adjustment system, wherein the press mold height adaptive adjustment system includes a transmission mechanism for adjusting the mold height of the slide block, an adjustment motor, a laser rangefinder sensor embedded in the lower surface of the press slide block, an absolute encoder installed in the transmission mechanism, a motor protector installed in the electrical cabinet, contactor one, contactor two, and a main controller. The absolute encoder is communicatively connected to the main controller and is used to collect transmission information of the transmission mechanism. Contactor one and contactor two are used to control the forward and reverse rotation of the adjustment motor to drive the slide block to rise or fall. The laser rangefinder sensor... The distance sensor, absolute encoder, motor protector, contactor one, contactor two, and the main controller are connected via a communication network port and input / output points. The main controller calculates a suitable running trajectory based on the mold height and current slider height information collected by the laser distance sensor and absolute encoder, and controls the transmission mechanism through the motor protector, contactor one, and contactor two to complete the running trajectory, achieving adaptive adjustment of the mold height. The main controller is also connected to a touch screen for displaying the operating status of the press mold height, the current actual height of the mold, and the current mold height of the press. Its characteristic is that... The adaptive adjustment method includes a calibration mode and a die adjustment mode, wherein the calibration mode and the die adjustment mode are controlled by operation via a touch screen; First, the calibration mode is performed via the touch screen, the main controller automatically drives the slide block to the bottom dead center, a laser ranging sensor is used to measure the current distance value from the lower surface of the slide block to the workbench, which is taken as the current die height, and transmits the value to the main controller, the main controller calibrates the absolute value encoder according to the above value, then automatically returns to the top dead center, and the calibration mode is completed; Then the die adjustment mode is entered, which includes the following steps: Step 1) Measurement of die height: before loading the die, the press slide block is operated to the top dead center, the laser ranging sensor measures the height m from the lower plane of the press slide block to the press workbench, after loading the die, the laser ranging sensor measures the height n from the lower plane of the press slide block to the upper plane of the upper die of the die, and the theoretical height a of the die is calculated by the controller as a=m-n; the main controller reads the current value of the absolute encoder as the current die height b; Step 2) The main controller adjusts the die height according to the magnitudes of the values a and b, which is divided into a rising process and a falling process: when a>b, the rising process adjustment is performed, the controller sends a signal to control the first contactor to pull in, the adjustment motor rotates forward, and the laser ranging sensor measures the slide block height in due time, when the slide block height rises to the position of a+2mm, the adjustment motor stops for 1 second, then adjusts downward to a, and the die adjustment stops; when a<b, the main controller controls the second contactor to pull in, the adjustment motor rotates reversely, the slide block descends, the die height decreases, and when the die height is adjusted to a, the adjustment stops; when a=b, no adjustment is performed.

2. The adaptive adjustment method according to claim 1, characterized in that, In step 2), during the die height adjustment, when the adjustment motor rotates reversely and the slide block descends, when the slide block height position is at the position of a+d, the main controller sends a braking signal to the adjustment motor to make the adjustment motor start braking, and the slide block finally stops at the position a, where d is the descending braking distance of the adjustment motor for the slide block.

3. The adaptive adjustment method according to claim 2, characterized in that, After the first adjustment in step 2) is completed, the difference g between the current die height value b' of the slide block and the target height a, where g = b'-a, when g>0.1mm or g<-0.1mm, a readjustment process will be started: the main controller recalculates the braking distance d', d'=d-g, and controls the adjustment motor to rotate forward through the first contactor to raise the slide block to the position of a+2mm, then controls the adjustment motor to rotate reversely through the second contactor, descends according to the braking distance d' again and makes the slide block stop at the target position, until -0.1mm≤g≤0.1mm, it is confirmed that the die height is adjusted to the target value, and the adjustment process ends.

4. The adaptive adjustment method according to claim 3, characterized in that, After the readjustment process is started three times repeatedly, if the die height adjustment difference g still cannot stay within the range of [-0.1mm, 0.1mm], the die height adjustment process is stopped, the slide block is braked, and a fault alarm is issued at the same time.

5. The adaptive adjustment method according to claim 1, characterized in that, The laser ranging sensor is installed in the middle area of the lower plane of the press slide block, is flush with the lower plane of the slide block after being embedded, and is used for collecting the current height of the die in due time.

6. The adaptive adjustment method according to claim 1, characterized in that, The absolute encoder is connected to the synchronous signaling device inside the slider and is also connected to the main controller signal, transmitting the position information of the transmission mechanism to the main controller in real time. The main controller then calculates the current mold height adjustment position of the press.

7. The adaptive adjustment method according to claim 1, characterized in that, The motor protector is equipped with auxiliary contacts to feed back the overload, short circuit, phase loss, locked rotor, and three-phase imbalance status of the motor to the main controller for adjusting the protection of the motor control circuit. The motor protector is also used to control the power supply to contactor one and contactor two.

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