A press machine die loading height automatic compensation system

Abstract

The application discloses a press machine die loading height automatic compensation system, which comprises a man-machine interface, a PLC control device, a servo driver, a servo motor, a pressure sensor, a transmission device, an encoder and a brake arranged on the servo motor; the man-machine interface is used for man-machine interaction and signal transmission to the PLC control device, and the man-machine interface comprises input columns of various parameters, wherein the parameters comprise parameters of a die, a die loading height H, a target tonnage Tn, a die loading height deviation value range AH, a tonnage deviation value range AT, a sampling point number N, a single adjustment amount AH, and a tonnage allowable range ATs; the pressure sensor is used for measuring an actual tonnage T and transmitting data to the PLC control device; the PLC controller is used for controlling the servo driver; the servo driver is used for controlling the servo motor; the servo motor is used for controlling the transmission device to adjust the die loading height of a sliding block; and the PLC control device is provided with a die loading height automatic compensation program.

Description

Technical Field

[0001] This invention is an automatic compensation system for the mold mounting height of a press. Background Technology

[0002] The die mounting height of a press refers to the distance between the bottom surface of the slide and the upper surface of the worktable when the slide is at its bottom dead center. Currently, in the press industry, most slide die mounting height adjustments are made electrically, with a few using manual adjustment.

[0003] The electric adjustment is powered by a three-phase asynchronous motor. Due to the characteristics of the mold adjustment mechanism and the performance of the motor itself, the motor has a certain inertia when it stops, requiring the use of a brake. This makes it impossible to guarantee the accuracy of mold adjustment. Often, the operator needs to rely on experience to allow some lead time or make multiple adjustments to adjust the mold height to a satisfactory value. The transmission structure of the mold adjustment device has a certain fit clearance, which can change under the influence of external forces during operation. This can also affect the actual mold height of the press, thus affecting product quality. At the same time, during the operation of the machine tool, the temperature of some transmission components such as the press shaft and bearings changes over time, which can also cause changes in the actual mold height.

[0004] In the past, if over-stamping or under-stamping occurred due to these reasons, operators usually had to readjust the die height, which was both time-consuming and affected output. Furthermore, the original die height adjustment device had many parts, making it difficult to manufacture and install, and the worm gear ring needed to be made of expensive bronze, resulting in high usage and maintenance costs. Summary of the Invention:

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic compensation system for the mold mounting height of a press.

[0006] An automatic compensation system for mold loading height of a press includes a human-machine interface, a PLC control device, a servo driver, a servo motor, a pressure sensor, and a transmission device. The servo motor is equipped with an encoder and a brake. The human-machine interface is used for human-machine interaction and transmitting signals to the PLC control device. The human-machine interface includes input fields for various parameters, including mold parameters, mold loading height H, target tonnage Tn, mold loading height deviation range △H, tonnage deviation range △T, number of sampling points N, single adjustment amount △h, and allowable tonnage range △Ts.

[0007] The pressure sensor is used to measure the actual tonnage T and transmit the data to the PLC control device. The PLC controller is used to control the servo driver, the servo driver is used to control the servo motor, the servo motor is used to control the transmission device to adjust the mold mounting height of the slider, and the PLC control device is equipped with an automatic mold mounting height compensation program.

[0008] To achieve automatic mold height compensation, the automatic mold height compensation program includes the following steps:

[0009] Step 1: Accept parameter information input from the human-machine interface;

[0010] Step 2: The pressure sensor value is read once for each stamping cycle to obtain the actual tonnage T of this stamping cycle. A calculation is performed every N data points, and the calculation result is compared with the target tonnage.

[0011] When the actual tonnage is too small, when the machine tool reaches the top dead center, the mold height will be reduced by △h, and then the machine tool will continue to run. If the actual tonnage is still too small, the mold height will be reduced by △h again until the value of the actual tonnage T is within the allowable range of △Ts, at which point the machine tool will stop adjusting.

[0012] If the cumulative reduction exceeds the mold height deviation range △H or the actual tonnage T exceeds the tonnage deviation range △T, the machine tool will immediately stop and alarm, prompting the operator to check whether the relevant parameters are incorrect; when the actual tonnage is too large, adjust in the reverse order according to the above logic.

[0013] Step 3: Save the adjusted actual mold height data.

[0014] To improve the system and prevent unexpected errors, step two also includes a tonnage trend alarm function, which includes the following steps:

[0015] When the actual tonnage T continuously increases or decreases, and the actual mold height H is adjusted, but the actual tonnage T does not change accordingly or the trend of the actual tonnage T does not change, the machine tool will immediately alarm, prompting the operator to check whether there are any changes in the equipment, mold, or raw materials.

[0016] To ensure transmission efficiency, the transmission device is a gear transmission structure, which includes a motor gear, an intermediate gear, and an adjusting gear. The motor gear is connected to the output end of the servo motor, and the intermediate gear is located between the adjusting gear and the motor gear. All three mesh. The gear transmission structure has the advantages of high transmission efficiency, simple installation and maintenance, high reliability, and low manufacturing cost.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0018] (1) The servo motor is used to adjust the enclosure height, which has the advantages of large output torque, large braking torque, small size, high precision, fast response speed and strong overload resistance.

[0019] (2) The press tonnage can be collected by the pressure sensor and the mold height can be automatically compensated.

[0020] (3) It can monitor the production status in real time without manual intervention or machine stoppage for adjustment, thus eliminating product quality problems caused by external factors such as temperature, gaps, and wear.

[0021] (4) It can realize the function of detecting changes in mold height. If the mold height changes due to external factors, it can be automatically reset and alarm will be triggered.

[0022] (5) It has an automatic formula correction function, which can save the optimal parameters to the formula;

[0023] (6) It has over-tonnage alarm and trend alarm functions, which can provide early warning and reduce losses;

[0024] (7) Gear transmission is more efficient, more reliable, and less expensive to manufacture than traditional worm gear mechanisms.

[0025] (8) The mold loading height display is integrated into the human-machine interface, reducing the need for a display and related mechanisms. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the automatic mold loading height compensation system for a press.

[0027] Figure 2 This is a schematic diagram of the automatic mold loading height compensation system for a press.

[0028] Figure 3 This is a schematic diagram illustrating the changes in relevant parameters;

[0029] In the diagram, 1 is the human-machine interface, 2 is the PLC control device, 3 is the servo driver, 4 is the pressure sensor, 5 is the servo motor, 6 is the motor gear, 7 is the intermediate gear, and 8 is the adjusting gear. Detailed Implementation

[0030] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0031] like Figure 1-3 As shown, the components are: 1. Human-machine interface; 2. PLC control device; 3. Servo driver; 4. Pressure sensor; 5. Servo motor; 6. Motor gear; 7. Intermediate gear; 8. Adjusting gear.

[0032] An automatic compensation system for mold loading height of a press includes a human-machine interface 1, a PLC control device 2, a servo driver 3, a servo motor 5, a pressure sensor 4, and a gear transmission device. The gear transmission device includes a motor gear 6, an intermediate gear 7, and an adjusting gear 8. The servo motor 5 is equipped with an encoder and a brake. The motor gear 6 is connected to the output end of the servo motor 5. The intermediate gear 7 is located between the adjusting gear 8 and the motor gear 6, and the three mesh. Specifically, the servo motor 5 has an adjustable speed and precise positioning. During the adjustment process, it can approach the target value at high speed and decelerate and stop when approaching the target value. The target value can be reached in one adjustment.

[0033] By combining the pressure sensor 4 with the mold height adjustment system, not only can the machine tool tonnage be displayed and over-tonnage alarm functions be realized, but the mold height of the machine tool can also be automatically compensated based on the feedback value of the pressure sensor 4, ensuring the continuous and stable operation of the equipment.

[0034] The servo motor 5 has a fast response speed and can start and stop immediately according to PLC commands without stopping the equipment. It can complete the adjustment of the mold height within the stamping cycle interval.

[0035] The human-machine interface 1 is used for human-machine interaction and to transmit signals to the PLC control device 2. The human-machine interface 1 includes input fields for various parameters, including mold parameters, mold installation height H, target tonnage Tn, mold installation height deviation range △H, tonnage deviation range △T, number of sampling points N, single adjustment amount △h, and tonnage allowable range △Ts.

[0036] Pressure sensor 4 is used to measure the actual tonnage T and transmit the data to PLC control device 2. PLC controller is used to control servo driver 3, servo driver 3 is used to control servo motor 5, servo motor 5 is used to control the transmission device to adjust the mold mounting height of the slider. PLC control device 2 is equipped with an automatic mold mounting height compensation program.

[0037] The automatic mold height compensation program includes the following steps:

[0038] Step 1: Accept the parameter information input from the human-machine interface 1;

[0039] Step 2: The pressure sensor 4 value is read once for each stamping cycle to obtain the actual tonnage T of this stamping cycle. A calculation is performed every N data points, and the calculation result is compared with the target tonnage.

[0040] When the actual tonnage is too small, when the machine tool reaches the top dead center, the mold height will be reduced by △h, and then the machine tool will continue to run. If the actual tonnage is still too small, the mold height will be reduced by △h again until the value of the actual tonnage T is within the allowable range of △Ts, at which point the machine tool will stop adjusting.

[0041] If the cumulative reduction exceeds the mold height deviation range △H or the actual tonnage T exceeds the tonnage deviation range △T, the machine tool will immediately stop and alarm, prompting the operator to check whether the relevant parameters are incorrect; when the actual tonnage is too large, adjust in the reverse order according to the above logic.

[0042] During operation, if the actual tonnage T continuously increases or decreases, and the actual mold height H is adjusted, but the actual tonnage T does not change accordingly or the trend of the actual tonnage T does not change, the machine tool will immediately alarm, prompting the operator to check whether there are any changes in the equipment, mold, or raw materials.

[0043] Step 3: Save the adjusted actual mold height data.

[0044] Specific operation process: When the user adjusts the mold height, he / she inputs the relevant mold parameters through the human-machine interface 1 and clicks "Start Adjustment". The PLC control device 2 sends corresponding instructions to the servo driver 3 according to the parameters input by the human-machine interface 1. After receiving the instructions, the servo motor 5 outputs voltage and current signals to the servo motor 5, the brake of the servo motor 5 is opened, and the servo motor 5 starts to rotate, driving the motor gear 6, intermediate gear 7 and adjusting gear 8 to rotate. The mold height of the machine tool begins to adjust. The encoder of the servo motor 5 feeds back the real-time running position to the servo driver 3. The servo driver 3 feeds back the running position to the PLC control device 2. When the mold height of the machine tool reaches the set value, the servo driver 3 and the servo motor 5 stop working and the brake of the servo motor 5 is closed.

[0045] When the user activates the automatic compensation system during operation, the pressure sensor 4 detects the punching tonnage of the machine tool each time. The PLCPLC control device 2 calculates based on the collected data to determine whether the mold height needs to be increased or decreased. The PLCPLC control device 2 sends the corresponding action command to the servo driver 3, and the servo motor 5 performs the corresponding action, driving the motor gear 6, intermediate gear 7 and adjusting gear 8 to rotate, thereby adjusting the mold height.

[0046] The PLCPLC control device 2 transmits the optimal parameters to the human-machine interface 1 in real time based on the collected data, overwriting the original formula data for easy recall next time.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic compensation system for mold mounting height on a press, characterized in that, The system includes a human-machine interface (HMI), a PLC control unit, a servo driver, a servo motor, a pressure sensor, and a transmission device. The servo motor is equipped with an encoder and a brake. The HMI is used for human-machine interaction and transmitting signals to the PLC control unit. The HMI includes input fields for various parameters, including mold parameters, mold mounting height H, target tonnage Tn, mold mounting height deviation range △H, tonnage deviation range △T, number of sampling points N, single adjustment amount △h, and allowable tonnage range △Ts. The pressure sensor is used to measure the actual tonnage T and transmit the data to the PLC control device. The PLC control device is used to control the servo driver, the servo driver is used to control the servo motor, the servo motor is used to control the transmission device to adjust the mold mounting height of the slider, and the PLC control device is equipped with an automatic mold mounting height compensation program. The automatic mold height compensation program includes the following steps: Step 1: Accept parameter information input from the human-machine interface; Step 2: The pressure sensor value is read once for each stamping cycle to obtain the actual tonnage T of this stamping cycle. A calculation is performed every N data points, and the calculation result is compared with the target tonnage Tn. When the actual tonnage is too small, when the machine tool reaches the top dead center, reduce the mold height by a single adjustment amount △h and continue running. If the actual tonnage is still too small, continue to reduce the mold height by a single adjustment amount △h until the value of the actual tonnage T is within the allowable tonnage range △Ts, and then stop adjusting the machine tool. If the cumulative reduction exceeds the mold height deviation range △H or the actual tonnage T exceeds the tonnage deviation range △T, the machine tool will immediately stop and alarm, prompting the operator to check whether the relevant parameters are incorrect; when the actual tonnage is too large, adjust in the reverse order according to the above logic. Step 3: Save the adjusted actual mold height data; Step two also includes a tonnage trend alarm function, which includes the following steps: When the actual tonnage T continuously increases or decreases, and the actual mold height H is adjusted, but the actual tonnage T does not change accordingly or the trend of the actual tonnage T does not change, the machine tool will immediately alarm, prompting the operator to check whether there are any changes in the equipment, mold, or raw materials.

2. The automatic compensation system for mold mounting height of a press according to claim 1, characterized in that, The transmission device is a gear transmission structure, which includes a motor gear, an intermediate gear, and an adjusting gear. The motor gear is connected to the output end of the servo motor, and the intermediate gear is located between the adjusting gear and the motor gear, and the three mesh with each other.

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