Internal high-pressure forming equipment based on servo electric cylinder
By replacing the hydraulic cylinder with a servo electric cylinder in the internal high-pressure forming equipment, the problems of slow response speed and low control accuracy in the prior art are solved, and a more efficient and more accurate high-pressure forming process in the pipe fittings is achieved.
Patent Information
- Application Number
- CN202411979243.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-02-25
AI Technical Summary
The feed actuators of existing internal high-pressure forming equipment are mainly hydraulic cylinders controlled by hydraulic systems, and there are problems such as slow response speed, low control accuracy and high control difficulty, resulting in pipe fitting forming defects and waste of materials.
The side cylinders of the internal high-pressure forming equipment are replaced by hydraulic cylinders with servo electric cylinders, and the internal high-pressure forming equipment is redesigned to improve control accuracy and response speed.
Through the use of servo electric cylinders, the control accuracy and yield of the internal high-pressure forming equipment are improved, production costs are reduced, and the hysteresis and control difficulty of the hydraulic system are solved.
Smart Images
Figure CN119500853A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tube internal high pressure forming, in particular to an internal high pressure forming device based on a servo electric cylinder. Background Art
[0002] The development of high pressure forming technology for pipe fittings has a history of more than 100 years. As a hydraulic forming technology suitable for forming different types of pipes, it has been recognized as an economical, high-quality lightweight parts manufacturing technology. In recent years, the application of high pressure forming technology in the production of lightweight automotive parts has become increasingly widespread, mainly due to its advantages in part performance and the continuous improvement of the performance of forming equipment. High pressure forming equipment generally needs to have the functions of mold closing, sealing, pressurization and feeding and replenishing. It is required that the high pressure equipment has the function of replenishing and feeding, especially for the manufacture of variable-section special-shaped pipe parts with large expansion rates. It is required that the high pressure equipment has a high-precision and fast-response feeding and replenishing execution system to better control the amount of feeding and prevent the tube blank from excessive thinning, rupture, failure or wrinkling defects.
[0003] Defects and deficiencies of the prior art: At present, the feeding actuator of the internal high pressure forming equipment is mainly driven by the hydraulic cylinder controlled by the hydraulic system. When the equipment is molded, the controller generally sends a control instruction to the electromagnetic components such as the electromagnetic overflow valve, and then controls the side cylinder hydraulic cylinder to feed and replenish the material. However, the hydraulic system and hydraulic transmission have a certain lag relative to the direct electric control system. After the electrical system sends out the instruction, it must first pass through the hydraulic electric control element, and then pass through the hydraulic control system such as the hydraulic valve to open the oil circuit to generate pressure, and finally drive the hydraulic cylinder to replenish the material. The response speed of the execution control system command is relatively slow; the accuracy of the hydraulic cylinder to control the feeding amount is not high. Since the liquid is inevitably compressible, and there is high-pressure liquid inside the pipe during the internal high pressure forming process, the side cylinder will be over-positioned or insufficient in the engineering application, and it is extremely difficult to control the specified amount of material; the side cylinder feeding and replenishing hydraulic cylinder is mostly controlled by force control plus displacement sensor feedback. If the internal pressure of the internal high pressure forming of the pipe is not well coordinated, the side cylinder may be passively retreated and the sealing is poor, thereby causing defects in the forming of the pipe and causing material waste. Summary of the invention
[0004] Therefore, in order to solve the above-mentioned problems, the side cylinder of the internal high pressure forming equipment is replaced by a servo electric cylinder from a hydraulic cylinder, and the hydraulic drive is converted into an electrical drive. The internal high pressure forming equipment is redesigned according to the size and functional requirements of the servo electric cylinder, so as to improve the execution speed and control accuracy of the internal high pressure forming of pipe fittings, reduce the control difficulty of the control system, improve the working efficiency and yield rate of the internal high pressure forming equipment of pipe fittings, and reduce production costs.
[0005] The problem to be solved by the present invention is to provide an internal high pressure forming device based on a servo electric cylinder, which can adapt to variable diameter tubular parts with large expansion rates and has good feeding and filling accuracy, response speed and control accuracy.
[0006] The technical solution to the above problem is: an internal high pressure forming device based on a servo electric cylinder, comprising a work surface, a main cylinder, an electrical control system, an upper mold, a lower mold, two electric cylinder support stands and two servo electric cylinders; Four guide columns are arranged on the work surface, and a master cylinder support stand is arranged on the four guide columns; flange mounting seats are symmetrically arranged on the left and right sides of the work surface; the master cylinder is mounted on the master cylinder support stand; the upper mold is mounted on the movable frame and connected to the master cylinder through the movable frame and the guide columns; a master cylinder limit block is arranged on the movable frame, and the master cylinder limit block is located above the flange mounting seat; the lower mold is mounted on the work surface and is located directly below the upper mold; The two electric cylinder support stands are respectively located on the left and right sides of the work surface; the two servo electric cylinders are respectively fixedly mounted on the two electric cylinder support stands through electric cylinder fixing seats, and the front ends of the servo electric cylinders are mounted on the work surface through flange mounting seats; the telescopic rod of the servo electric cylinder is fixedly connected to the punch; the punch is adapted to the mold; and the electrical control system is electrically connected to the servo electric cylinder.
[0007] Its further technical solution is: the flange mounting seat adopts a welded structure, including a base plate, a vertical plate and a baffle; the base plate is fixedly connected to the work table, the front end of the servo electric cylinder is installed on the vertical plate, and the vertical plate is provided with reinforcing ribs I; the baffle is connected to the electric cylinder support frame.
[0008] Its further technical solution is: the electric cylinder fixing seat is an L-shaped plate, which is mainly composed of a horizontal plate and a vertical plate. The electric cylinder fixing seat is symmetrically arranged on both sides of the servo electric cylinder, the horizontal plate is fixed on the electric cylinder support stand, and the vertical plate is tightly attached to the servo electric cylinder to limit the horizontal movement of the servo electric cylinder; reinforcing ribs II are arranged between the horizontal plate and the vertical plate.
[0009] A further technical solution is: the electric cylinder support stand adopts a welded structure, including a panel, a square tube bracket, a vertical plate, a placement plate, a square tube and a ground mounting plate; the square tube bracket is a frame structure; the panel is arranged above the square tube bracket for placing the servo electric cylinder; the vertical plate is arranged on the side of the square tube bracket for installing the servo drive; the placement plate is arranged on the bottom surface of the square tube bracket for placing components of the electrical control system; the ground mounting plate is arranged at the bottom of the square tube bracket for stabilizing the electric cylinder support stand; the square tube bracket is fixedly connected to the baffle of the flange mounting seat through the square tube; the panel is fixedly connected to the horizontal plate of the electric cylinder fixing seat by bolts and nuts.
[0010] A further technical solution is that threaded tie rods are symmetrically arranged between the two flange mounting seats; and there are four threaded tie rods.
[0011] Its further technical solution is: the maximum thrust of the servo electric cylinder is 350kN, the maximum linear speed is 25mm / s, and the control accuracy reaches ±0.01mm.
[0012] A further technical solution is: the electrical control system is electrically connected to a controller of the servo electric cylinder; the servo electric cylinder can be driven by a pulse electric signal directly sent by the controller.
[0013] A further technical solution is that the control method of the servo electric cylinder adopts PID control.
[0014] Due to the adoption of the above technical solution, the internal high pressure forming equipment based on the servo electric cylinder of the present invention has the following beneficial effects compared with the prior art: (1) The present invention greatly improves the control accuracy and product efficiency of the equipment by replacing the traditional feeding and replenishing hydraulic cylinder in the internal high pressure forming equipment with a servo electric cylinder. In terms of the feeding amount, the control accuracy of the left and right feeding servo electric cylinders of the internal high pressure forming equipment based on the servo electric cylinder can reach ±0.1mm, and the synchronization error of the two servo electric cylinders adjusted by the PID controller does not exceed 0.15mm; the maximum thrust of the servo electric cylinder is 350kN, which can ensure the stable position output of the servo electric cylinder within the rated load range, and when the servo electric cylinder adopts the position control mode, there will be no situation of insufficient or excessive feeding of the side cylinder due to excessive internal pressure or uncoordinated system pressure, thereby greatly improving the sealing and forming controllability of the pipe fittings; the servo electric cylinder can be driven by the controller directly sending a pulse electric signal, without passing through the hydraulic control system, and the control method is simpler and faster. The electro-hydraulic signal control is changed to electric pulse signal control to ensure the response speed of the electric cylinder.
[0015] (2) The present invention uses a self-designed servo electric cylinder tooling to limit the possible sliding directions of the servo electric cylinder in all directions, such as horizontally, vertically, and front and back, to ensure the installation coordination between the servo electric cylinder, the main cylinder, and the mold. In addition, the upper parts of the flange mounting seats on the left and right sides are connected by threaded tie rods to form a closed force system, thereby ensuring the load capacity and safety of the equipment.
[0016] The technical features of the internal high pressure forming equipment based on a servo electric cylinder of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of an internal high pressure forming device based on a servo electric cylinder according to the present invention; Figure 2 It is a structural schematic diagram of the flange mounting seat of the present invention.
[0018] In the figure: 1-Servo electric cylinder; 2-electric cylinder fixing seat, 21-horizontal plate, 22-vertical plate, 23-reinforcement rib II; 3-electric cylinder support stand, 31-panel, 32-square tube, 33-square tube bracket, 34-vertical plate, 35-placing plate, 36-ground mounting plate; 4-Work surface; 5-flange mounting seat; 51-bottom plate, 52-vertical plate, 53-baffle plate; 54-reinforcement rib I; 6-main cylinder limit block; 7-threaded pull rod; 8-mold; 9-main cylinder; 10-main cylinder support stand; 11-guide column; 12-movable frame. DETAILED DESCRIPTION
[0019] like Figure 1 As shown: an internal high pressure forming equipment based on a servo electric cylinder, including a work surface 4, a main cylinder 9, an electrical control system, a mold 8, two electric cylinder support stands 3 and two servo electric cylinders 1; the mold 8 includes an upper mold and a lower mold.
[0020] Four guide columns 11 are arranged on the work surface 4, and a main cylinder support stand 10 is arranged on the four guide columns 11; flange mounting seats 5 are symmetrically arranged on the left and right sides of the work surface 4; the main cylinder 9 is installed on the main cylinder support stand 10; the upper mold is installed on the movable frame 12 and connected to the main cylinder 9 through the movable frame and the guide columns 11; the movable frame 12 can move up and down on the guide columns 11; the main cylinder limit block 6 is arranged on the movable frame 12, and the main cylinder limit block 6 is located above the flange mounting seat 5; the lower mold is installed on the work surface 4 and is located directly below the upper mold. When the main cylinder 9 of the equipment moves downward for mold closing, the main cylinder limit block 6 cooperates with the flange mounting seat 5 to prevent the main cylinder from over-pressing, protect the servo electric cylinder 1, and ensure the matching accuracy of the upper and lower molds.
[0021] The two electric cylinder support stands are respectively located on the left and right sides of the work surface; the two servo electric cylinders 1 are respectively fixedly mounted on the two electric cylinder support stands 3 through the electric cylinder fixing seats 2, and the front end of the servo electric cylinder 1 is mounted on the work surface 4 through the flange mounting seat 5; the telescopic rod of the servo electric cylinder 1 is fixedly connected to the punch; the punch is adapted to the mold 8; the electrical control system is electrically connected to the servo electric cylinder 1.
[0022] According to the load-bearing capacity and working requirements of the main cylinder and the internal high-pressure equipment, the selected servo electric cylinder has a maximum thrust of 350kN, a maximum linear speed of 25mm / s, and a control accuracy of ±0.01mm. Since the servo electric cylinder does not need to be controlled by the electronic control system to the hydraulic system, it is directly controlled by the controller to the electrical system, so both the execution efficiency and the response speed are faster than the hydraulic cylinder. In the tooling, the front flange mounting seat 5 is installed on the work surface 4. The main function is to ensure the extension length, horizontal position and height of the servo electric cylinder on the work surface 4, so as to ensure that the punch can be perfectly matched with the mold 8 after the subsequent installation, and improve the matching accuracy between the punch and the mold, so as to ensure the sealing of the high-pressure liquid in the pipe during the internal high-pressure forming process.
[0023] like Figure 2 As shown: the flange mounting seat 5 adopts a welded structure, and the material is 45# steel with good comprehensive mechanical properties. The welding components of the flange mounting seat 5 include a bottom plate 51 with a thickness of 40 mm, a vertical plate 52 with a thickness of 50 mm, and a baffle 53 with a thickness of 40 mm; the bottom plate 51 is fixedly connected to the work table 4, and the vertical plate 52 is provided with a through hole for the front end of the servo electric cylinder 1 to pass through. The front end of the servo electric cylinder 1 is installed on the vertical plate 52, and a reinforcing rib Ⅰ54 with a thickness of 24 mm is arranged between the vertical plate 52 and the baffle 53; the baffle 53 is connected to the electric cylinder support stand 3.
[0024] The electric cylinder fixing seat 2 is used to fix the horizontal position of the servo electric cylinder. The electric cylinder fixing seat 2 is an L-shaped plate, which is made of 15mm thick Q235-A steel in one piece. The L-shaped plate is mainly composed of a horizontal plate 21 and a vertical plate 22. The electric cylinder fixing seat 2 is symmetrically arranged on both sides of the servo electric cylinder 1. The horizontal plate 21 is fixed on the electric cylinder support stand 3, and the vertical plate 22 is tightly attached to the servo electric cylinder 1, thereby limiting the horizontal movement of the servo electric cylinder 1. A reinforcing rib II 23 is arranged between the horizontal plate 21 and the vertical plate 22.
[0025] The electric cylinder support stand 3 is mainly used to support the weight of the servo electric cylinder and ensure the vertical position of the servo electric cylinder. The support stand also adopts a welded structure. The stand material is based on the standard stand square tube material, and Q235-A steel is selected. The welded components of the electric cylinder support stand 3 include a 15mm thick panel 31, a 5mm thick square tube bracket 33, a 3mm thick upright plate 34, a 3mm thick placement plate 35, a square tube 32 and a ground mounting plate 36. The square tube bracket 33 is a frame structure; the panel 31 is arranged above the square tube bracket 33 for placing the servo electric cylinder 1; the upright plate 34 is arranged on the side of the square tube bracket 33 for installing the servo drive; the placement plate 35 is arranged on the bottom of the square tube bracket 33 for placing the components of the electrical control system (for example: aluminum shell resistor, which is used to connect with the servo drive to prevent the servo drive and the motor from being damaged by overvoltage); the anchor mounting plate 36 is arranged at the bottom of the square tube bracket 33 for stabilizing the electric cylinder support stand 3; the square tube bracket 33 is fixedly connected to the baffle 53 of the flange mounting seat 5 through the square tube 32. The panel 31 is fixedly connected to the horizontal plate 21 of the electric cylinder fixing seat 2 by bolts and nuts.
[0026] In order to form a closed force system on the upper part of the left and right flange mounting seats to ensure the overall strength and rigidity of the flange mounting seats, threaded tie rods 7 are symmetrically arranged between the two flange mounting seats 5; there are four threaded tie rods 7. In this embodiment, four threaded tie rods 7 with a specification of M24×1500mm are used to connect the left and right flange mounting seats.
[0027] The above tooling parts comprehensively guarantee the installation accuracy of the servo electric cylinder 1 and the coordination with the main cylinder 9 and the mold 8, while also ensuring the carrying capacity of the equipment, providing a solid foundation for the stable operation of high pressure forming in pipe fittings.
[0028] The electrical control system is electrically connected to the controller of the servo electric cylinder 1; the servo electric cylinder 1 can be driven by a pulse electric signal directly sent by the controller. The control method of the servo electric cylinder 1 adopts PID control. The synchronization error of the two electric cylinders adjusted by the PID controller does not exceed 0.15mm.
[0029] On the basis of the original internal high-pressure equipment, the present invention adopts a servo electric cylinder with fast response speed, high execution accuracy and simple and accurate control as the side cylinder feeding actuator to replace the original traditional hydraulic cylinder, so as to realize the precise control of the feeding amount and improve the efficiency and quality of the internal high-pressure forming of pipe fittings. At the same time, in order to cooperate with the original main cylinder of the internal high-pressure equipment, the present invention ensures the reliable installation of the electric cylinder without affecting the normal working performance of the electric cylinder, and ensures the load capacity and safety of the equipment by comprehensively considering the working conditions of the electric cylinder. At the same time, referring to the design experience of similar structures, the present invention also designs a tooling and a support stand for ensuring the reliable assembly of the servo electric cylinder, supports the body weight of the servo electric cylinder, limits the freedom of movement of the servo electric cylinder, ensures that the equipment forms a closed force system, and provides protection for the safety of the equipment.
[0030] The parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. The above content is a further detailed description of the present invention in combination with specific preferred implementation modes. It cannot be determined that the specific implementation of the present invention is limited to the records of the above embodiments. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the patent protection scope of the present invention determined by the submitted claims.
Claims
1. An internal high pressure forming device based on a servo electric cylinder, characterized in that: It includes a work surface, a main cylinder, an electrical control system, an upper mold, a lower mold, two electric cylinder support stands and two servo electric cylinders; Four guide columns are arranged on the work surface, and a master cylinder support stand is arranged on the four guide columns; flange mounting seats are symmetrically arranged on the left and right sides of the work surface; the master cylinder is mounted on the master cylinder support stand; the upper mold is mounted on the movable frame and connected to the master cylinder through the movable frame and the guide columns; a master cylinder limit block is arranged on the movable frame, and the master cylinder limit block is located above the flange mounting seat; the lower mold is mounted on the work surface and is located directly below the upper mold; The two electric cylinder support stands are respectively located on the left and right sides of the work surface; the two servo electric cylinders are respectively fixedly mounted on the two electric cylinder support stands through electric cylinder fixing seats, and the front ends of the servo electric cylinders are mounted on the work surface through flange mounting seats; the telescopic rod of the servo electric cylinder is fixedly connected to the punch; the punch is adapted to the mold; and the electrical control system is electrically connected to the servo electric cylinder.
2. According to claim 1, a servo electric cylinder-based high pressure forming equipment is characterized in that: The flange mounting seat adopts a welded structure, including a base plate, a vertical plate and a baffle; the base plate is fixedly connected to the work surface, the front end of the servo electric cylinder is installed on the vertical plate, and the vertical plate is provided with reinforcing ribs I; the baffle is connected to the electric cylinder support frame.
3. The internal high pressure forming equipment based on a servo electric cylinder according to claim 1, characterized in that: The electric cylinder fixing seat is an L-shaped plate, which is mainly composed of a horizontal plate and a vertical plate. The electric cylinder fixing seat is symmetrically arranged on both sides of the servo electric cylinder. The horizontal plate is fixed on the electric cylinder support stand, and the vertical plate is tightly attached to the servo electric cylinder to limit the horizontal movement of the servo electric cylinder; reinforcing ribs II are arranged between the horizontal plate and the vertical plate.
4. The internal high pressure forming equipment based on a servo electric cylinder according to claim 3 is characterized in that: The electric cylinder support stand adopts a welded structure, including a panel, a square tube bracket, a vertical plate, a placement plate, a square tube and a ground mounting plate; the square tube bracket is a frame structure; the panel is arranged above the square tube bracket for placing the servo electric cylinder; the vertical plate is arranged on the side of the square tube bracket for installing the servo drive; the placement plate is arranged on the bottom surface of the square tube bracket for placing components of the electrical control system; the ground mounting plate is arranged at the bottom of the square tube bracket for stabilizing the electric cylinder support stand; the square tube bracket is fixedly connected to the baffle of the flange mounting seat through the square tube; the panel is fixedly connected to the horizontal plate of the electric cylinder fixing seat by bolts and nuts.
5. The internal high pressure forming equipment based on a servo electric cylinder according to claim 1, characterized in that: Threaded tie rods are symmetrically arranged between the two flange mounting seats; there are four threaded tie rods.
6. The internal high pressure forming equipment based on a servo electric cylinder according to claim 1, characterized in that: The maximum thrust of the servo electric cylinder is 350kN, the maximum linear speed is 25mm / s, and the control accuracy reaches ±0.01mm.
7. The internal high pressure forming equipment based on a servo electric cylinder according to claim 1, characterized in that: The electrical control system is electrically connected to the controller of the servo electric cylinder; the servo electric cylinder can be driven by a pulse electric signal directly sent by the controller.
8. The internal high pressure forming equipment based on a servo electric cylinder according to claim 7, characterized in that: The control method of the servo electric cylinder adopts PID control.