Mother-son cylinder hydraulic machine and control method

Abstract

The invention relates to the technical field of hydraulic machines, in particular to a primary-secondary cylinder hydraulic machine and a control method. The two sub-cylinders are mounted on the movable beams on the two sides respectively and share the same hydraulic control system with the main cylinder; the hydraulic control system is used for controlling the actions of the main cylinder and the sub-cylinder; the electromagnetic valve is used for controlling the pressurizing action of the sub-cylinder, and when the main cylinder is downwards pressed to a designated position, the sub-cylinder is pressurized; the hydraulic control system can simultaneously or independently adjust the pressing pressure of the main cylinder and the sub-cylinder; and the movable beam is fixedly connected with the upper cross beam and the lower cross beam through bolts.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic presses, and in particular to a master-and-sub-cylinder hydraulic press and a control method thereof. Background Art

[0002] Existing hydraulic presses are usually equipped with only one main cylinder for stamping large parts. However, in the production process where parts of various sizes need to be stamped, frequent mold changes are not only time-consuming, but also reduce production efficiency. In order to solve this problem, the present invention proposes an intelligent control method for a master-slave hydraulic press, which realizes the coordinated work of the master cylinder and the sub-cylinder by sharing a set of hydraulic control systems. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the prior art and to propose a master-and-daughter cylinder hydraulic press and a control method.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A master-and-sub-cylinder hydraulic press includes a master cylinder installed between an upper crossbeam and a lower crossbeam; it also includes two sub-cylinders installed on both sides of a movable beam, and share a hydraulic control system with the master cylinder; a hydraulic control system for controlling the movements of the master cylinder and the sub-cylinders; and an electromagnetic valve for controlling the pressurization of the sub-cylinders. When the master cylinder is pressed down to a specified position, the sub-cylinders are pressurized.

[0005] Furthermore, the hydraulic control system can adjust the pressing pressure of the master cylinder and the sub-cylinder simultaneously or individually; the movable beam is connected and fixed to the upper cross beam and the lower cross beam by bolts.

[0006] Furthermore, corresponding workbenches are respectively provided under the main cylinder and the sub-cylinder for installing molds; the workbenches include a workbench for stamping large parts and a workbench for stamping small parts; the workbench for stamping small parts includes a workbench 1 for stamping small parts and a workbench 2 for stamping small parts; the workbench 1 for stamping small parts and the workbench 2 for stamping small parts are respectively arranged on both sides of the workbench for stamping large parts; a large mold is placed on the workbench for stamping large parts, and a small mold 1 and a small mold 2 are respectively placed on the workbench 1 for stamping small parts and the workbench 2 for stamping small parts.

[0007] Furthermore, the master cylinder is the main actuator in the hydraulic control system, and the sub-cylinder is the auxiliary actuator in the hydraulic control system. The stroke of the master cylinder when it is pressed down to the specified position is calculated as: Set the piston diameter of the master cylinder to The displacement stroke that the piston needs to press down is , the piston area of ​​the master cylinder is , through the formula: calculate; When the master cylinder is pressed down to the specified position, the displacement stroke of the piston Detected by sensor or travel switch; Set the pressure required for the master cylinder during pressurization to , through the formula: calculate; Set the piston area of ​​the sub-cylinder to , through the formula: calculate; Hydraulic control system moves the displacement stroke of the master cylinder After reaching the designated position, the sub-cylinder begins to pressurize, and the piston diameter of the sub-cylinder is The required pressure is , through the formula calculate.

[0008] Furthermore, the hydraulic press also includes a column, a nut, and a mold. The column is used to support the upper beam and the lower beam; the nut is used to adjust the height of the column; and the mold is installed on a workbench and is used to stamp parts of different sizes.

[0009] A control method for a master-slave hydraulic press comprises the following steps: S1: Initialize the hydraulic control system; S2: According to the stamping task, select the corresponding mold and install it on the workbench for large parts stamping and the workbench for small parts stamping; S3: Detect the positions of the master cylinder and the sub-cylinder through sensors to ensure that they are in the initial positions; S4: Calculate the punching force of the main cylinder and the sub-cylinder according to the formula , where F is the punching force, P is the pressure, and A is the piston area; S5: Through the solenoid valve control, the master cylinder is pressed down to the specified position, and the pressure P change is monitored to ensure that it does not exceed the set safety value; S6: When the main cylinder reaches the specified position, the sub-cylinder is pressurized by controlling the solenoid valve, and the pressure P is adjusted according to the mold size and material properties; S7: Real-time monitoring of the pressure P and displacement during the stamping process, and adjustment of the opening of the solenoid valve through the feedback control algorithm to achieve precise control; S8: After the stamping is completed, the main cylinder and the sub-cylinder are controlled by the solenoid valve to return to the initial position.

[0010] Furthermore, in S4, the calculation of the punching force also includes the yield strength of the material and the geometric shape of the mold.

[0011] Furthermore, in S7, the feedback control algorithm adopts PID, and the formula is: ,in, is the control signal, is the error, They are proportional, integral and differential gains respectively.

[0012] The present invention provides a master-and-sub-cylinder hydraulic press and a control method, which reduces the time for frequent mold replacement, improves production efficiency and achieves the beneficial effect of coordinated work of the master cylinder and the sub-cylinder by sharing a set of hydraulic control systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the mother-and-child cylinder hydraulic press of the present invention; In the figure: 1-main cylinder; 2-upper crossbeam; 3-lower crossbeam; 4-sub-cylinder; 5-movable beam; 6-workbench for stamping large parts; 61-workbench 1 for stamping small parts; 62-workbench 2 for stamping small parts; 611-small mold 1; 621-small mold 2; 7-column; 8-nut; 9-mold. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1. In this embodiment, a master cylinder hydraulic press includes a master cylinder 1 installed between an upper crossbeam 2 and a lower crossbeam 3; it also includes two sub-cylinders 4 installed on both sides of a movable beam 5, and share a hydraulic control system with the master cylinder 1; a hydraulic control system for controlling the actions of the master cylinder 1 and the sub-cylinder 4; an electromagnetic valve for controlling the pressurizing action of the sub-cylinder 4, and when the master cylinder 1 is pressed down to a specified position, the sub-cylinder 4 is pressurized; the hydraulic control system can adjust the pressing pressure of the master cylinder 1 and the sub-cylinder 4 simultaneously or individually; the movable beam 5 is connected and fixed to the upper crossbeam 2 and the lower crossbeam 3 by bolts.

[0016] Embodiment 2. On the basis of the above-mentioned embodiment 1, corresponding workbenches are respectively provided under the main cylinder 1 and the sub-cylinder 4 for installing the mold 9; the workbenches include a workbench 6 for stamping large parts and a workbench 62 for stamping small parts; the workbench 62 for stamping small parts includes a workbench 1 61 for stamping small parts and a workbench 2 62 for stamping small parts; the workbench 1 61 for stamping small parts and the workbench 2 62 for stamping small parts are respectively arranged on both sides of the workbench 6 for stamping large parts; a large mold is placed on the workbench 6 for stamping large parts, and a small mold 1 611 and a small mold 2 621 are respectively placed on the workbench 1 61 for stamping small parts and the workbench 2 62 for stamping small parts.

[0017] Embodiment 3: In this embodiment, the master cylinder 1 is the main actuator in the hydraulic control system, and the sub-cylinder 4 is the auxiliary actuator in the hydraulic control system. The stroke of the master cylinder 1 pressed down to the specified position is calculated as: Set the piston diameter of master cylinder 1 to The displacement stroke that the piston needs to press down is , the piston area of ​​master cylinder 1 is , through the formula: calculate; When the master cylinder 1 is pressed down to the specified position, the displacement stroke of the piston Detected by sensor or travel switch; Set the pressure required for master cylinder 1 during the pressurization process to , through the formula: calculate; The piston area of ​​sub-cylinder 4 is set to , through the formula: calculate; The hydraulic control system moves the displacement stroke of the master cylinder 1 After reaching the designated position, sub-cylinder 4 begins to pressurize, and the piston diameter of sub-cylinder 4 is The required pressure is , through the formula: calculate.

[0018] Embodiment 4. In this embodiment, the hydraulic press further includes a column 7, a nut 8, and a mold 9. The column 7 is used to support the upper beam 2 and the lower beam 3; the nut 8 is used to adjust the height of the column 7, and the mold 9 is installed on a workbench for stamping parts of different sizes.

[0019] A control method for a master-slave hydraulic press comprises the following steps: S1: Initialize the hydraulic control system; S2: According to the stamping task, the corresponding die 9 is selected and installed on the large part stamping workbench 6 and the small part stamping workbench; S3: Detect the positions of the master cylinder 1 and the sub-cylinder 4 through sensors to ensure that they are in the initial positions; S4: Calculate the punching force of the main cylinder 1 and the sub-cylinder 4 according to the formula , where F is the punching force, P is the pressure, and A is the piston area; S5: Through the solenoid valve control, the master cylinder 1 is pressed down to the specified position, and the pressure P change is monitored to ensure that it does not exceed the set safety value; S6: When the main cylinder 1 reaches the specified position, the sub-cylinder 4 is pressurized by controlling the solenoid valve, and the pressure P is adjusted according to the size and material properties of the mold 9; S7: Real-time monitoring of the pressure P and displacement during the stamping process, and adjustment of the opening of the solenoid valve through the feedback control algorithm to achieve precise control; S8: After the stamping is completed, the main cylinder 1 and the sub-cylinder 4 are controlled by the solenoid valve to return to the initial position.

[0020] Embodiment 5, based on embodiment 4, in S4, the calculation of the punching force also includes the yield strength of the material and the geometric shape of the mold 9. In S7, the feedback control algorithm adopts PID, and the formula is ,in, is the control signal, is the error, They are proportional, integral and differential gains respectively.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A master cylinder hydraulic press, comprising a master cylinder (1) mounted between an upper crossbeam (2) and a lower crossbeam (3); and two sub-cylinders (4) respectively mounted on both sides of a movable beam (5) and sharing a hydraulic control system with the master cylinder (1); a hydraulic control system for controlling the movements of the master cylinder (1) and the sub-cylinders (4); and a solenoid valve for controlling the pressurization movement of the sub-cylinders (4), characterized in that: When the main cylinder (1) is pressed down to a specified position, the sub-cylinder (4) is pressurized.

2. A master-and-slave hydraulic press according to claim 1, characterized in that: The hydraulic control system is capable of adjusting the pressing pressure of the main cylinder (1) and the sub-cylinder (4) simultaneously or individually; the movable beam (5) is connected and fixed to the upper cross beam (2) and the lower cross beam (3) by bolts.

3. A master-and-slave hydraulic press according to claim 2, characterized in that: Corresponding workbenches are provided below the main cylinder (1) and the sub-cylinder (4) respectively, for mounting a mold (9); the workbenches include a workbench (6) for stamping large parts and a workbench (6) for stamping small parts; the workbench (6) for stamping small parts includes a first workbench (61) for stamping small parts and a second workbench (62) for stamping small parts; the first workbench (61) for stamping small parts and the second workbench (62) for stamping small parts are respectively arranged on both sides of the workbench (6) for stamping large parts; a large mold is placed on the workbench (6) for stamping large parts, and a first small mold (611) and a second small mold (621) are placed on the first workbench (61) for stamping small parts and the second workbench (62) for stamping small parts respectively.

4. A master-and-slave hydraulic press according to claim 1, characterized in that: The master cylinder (1) is a main actuator in the hydraulic control system, and the sub-cylinder (4) is an auxiliary actuator in the hydraulic control system. The stroke of the master cylinder (1) when it is pressed down to a specified position is calculated as: Set the piston diameter of the master cylinder (1) to The displacement stroke that the piston needs to press down is , the piston area of ​​the master cylinder (1) is , through the formula: calculate; When the master cylinder (1) is pressed down to the specified position, the piston displacement stroke Detected by sensor or travel switch; Set the pressure required for the master cylinder (1) during the pressurization process to , through the formula: calculate; The piston area of ​​the sub-cylinder (4) is set to , through the formula: calculate; The hydraulic control system moves the displacement stroke of the master cylinder (1) After reaching the designated position, the sub-cylinder (4) begins to pressurize. The piston diameter of the sub-cylinder (4) is The required pressure is , through the formula calculate.

5. The master-and-slave hydraulic press according to claim 1, characterized in that: The hydraulic press also includes a column (7), a nut (8), and a mold (9); the column (7) is used to support the upper crossbeam (2) and the lower crossbeam (3); the nut (8) is used to adjust the height of the column (7); and the mold (9) is installed on a workbench and is used to stamp parts of different sizes.

6. A control method for a master-and-sub-cylinder hydraulic press according to claim 1 to claim 5, characterized in that: The following steps are involved: S1: Initialize the hydraulic control system; S2: According to the stamping task, a corresponding die (9) is selected and installed on a large part stamping workbench (6) and a small part stamping workbench; S3: Detecting the positions of the main cylinder (1) and the sub-cylinder (4) through sensors to ensure that they are in their initial positions; S4: Calculate the punching force of the main cylinder (1) and the sub-cylinder (4) according to the formula , where F is the punching force, P is the pressure, and A is the piston area; S5: The solenoid valve is used to control the master cylinder (1) to be pressed down to a specified position, while the pressure P is monitored to ensure that it does not exceed the set safety value. S6: When the main cylinder (1) reaches the specified position, the sub-cylinder (4) is controlled by the solenoid valve to increase the pressure, and the pressure P is adjusted according to the size and material properties of the mold (9); S7: Real-time monitoring of the pressure P and displacement during the stamping process, and adjustment of the opening of the solenoid valve through the feedback control algorithm to achieve precise control; S8: After the stamping is completed, the main cylinder (1) and the sub-cylinder (4) are controlled by the solenoid valve to return to their initial positions.

7. A control method for a master-and-daughter cylinder hydraulic press according to claim 6, characterized in that: In step S4, the calculation of the punching force also includes the yield strength of the material and the geometric shape of the die (9).

8. The control method for a master-and-slave hydraulic press according to claim 6, characterized in that: In step S7, the feedback control algorithm adopts PID, and the formula is: ,in, is the control signal, is the error, They are proportional, integral and differential gains respectively.

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