Self-adaptive unbalance-loading-preventing and shock-suppressing device of press machine and press machine system

Abstract

The invention provides a press machine self-adaptive anti-unbalance-loading shock suppression device which comprises a hydraulic cylinder and a cylinder body, a space for containing damping liquid is formed in the cylinder body, and a plurality of damping holes are formed in the cylinder body; a piston is fixed at one end of the buffer damping rod, and the damping rod is embedded into the cylinder body and can slide relative to the cylinder body; the buffer sleeve is fixed to the other end of the damping rod and arranged on the hydraulic cylinder in a sleeving mode, and the sleeve can move along with the damping rod to shield or expose the damping holes one by one. Comprising an upper die, a lower die, a guide column, a lower die base, an image shooting piece, an image recognition piece, a hydraulic oil supply system, a lifting cylinder set, an industrial personal computer and the progressive buffering energy absorption device. When pressure is large, the sleeve can descend along with the damping rod to shield the damping holes one by one, the outflow resistance of damping liquid is increased, the effect of increasing damping and buffering force is achieved, collision energy generated in the working process of the punching machine can be absorbed in the buffering mode, the upper limit of the buffering mode is high, and production efficiency can be guaranteed.

Description

Technical Field

[0001] The invention relates to the field of press processing, and in particular to a press adaptive anti-eccentric load vibration suppression device and a press system. Background Art

[0002] As a traditional metal forming method, stamping plays an important role in the production of body parts. With the continuous increase in automobile production and sales, the automotive industry has higher and higher demands for the output and quality of stamping parts, and the production rhythm of stamping parts is also getting faster and faster. In order to produce qualified parts while ensuring production efficiency, the performance of stamping equipment is particularly important.

[0003] In the production of stamping parts, wrinkling, cracking and springback are the major defects that attract more attention. Wrinkling and cracking are closely related to materials, molds and process parameters, while there are more reasons that affect the dimensional error of parts, such as collision, vibration, and eccentric load generated by stamping equipment during operation. If the energy cannot be well absorbed and the eccentric load cannot be fully suppressed, it is very likely to affect the dimensional accuracy of the workpiece. Therefore, general stamping presses are equipped with corresponding buffering and shock absorbing devices. On the one hand, these devices use elastic media, such as springs, rubber and other components to reduce the rigid collision of the press during operation. On the other hand, the crank elbow mechanism is used to improve the press transmission system and improve the control of the inertial force of the press. For servo presses, since more diverse stamping process curves can be achieved, in order to more effectively reduce the collision and vibration during the stamping process, many servo presses implement multi-stage control, and the downward speed of the mold is reduced during the mold closing stage to achieve a certain buffering and shock absorbing effect.

[0004] However, with existing technologies, the contribution of elastic elements such as springs and rubber to buffering and shock absorption is limited, especially for large-tonnage presses. In addition, long-term high-load operation may cause these components to age and fail, so it is also a major challenge for the maintenance and upkeep of the equipment. As for the adjustment of the stamping process curve of the servo press, although the purpose of shock absorption can be achieved by reducing the stamping speed, the effect is limited, and a certain degree of production efficiency is sacrificed as a price. In addition, these buffering and shock absorption mechanisms rarely consider the problem of equipment overload. Once an abnormal situation occurs, the protection of the stamping equipment is insufficient, which may cause unnecessary losses. Summary of the invention

[0005] In view of this, it is necessary to provide a press adaptive anti-eccentric loading and vibration suppression device and a press system, which can absorb the collision energy generated by the punching machine during operation and effectively prevent the press from being eccentrically loaded.

[0006] A press machine adaptive anti-eccentric load vibration suppression device, comprising: a hydraulic cylinder, comprising a cylinder body, a space for containing damping fluid is formed inside the cylinder body, and a plurality of damping holes are opened on the cylinder body; A buffer damping rod, one end of which is fixed with a piston and is embedded in the cylinder body and can slide relative to the cylinder body; A buffer sleeve is fixed to the other end of the damping rod and sleeved on the hydraulic cylinder. The sleeve can follow the movement of the damping rod to cover or expose the damping holes one by one.

[0007] Furthermore, the damping holes are arranged along the height direction of the cylinder body, and the diameters of the damping holes gradually decrease from high to low.

[0008] Furthermore, the cylinder body is cylindrical, having four side surfaces evenly distributed at intervals of 90° in the circumferential direction, and each of the side surfaces is provided with a plurality of damping holes.

[0009] Furthermore, the four side surfaces are opposite to each other in pairs, and the damping holes on two opposite side surfaces are matched one by one.

[0010] Furthermore, a damping liquid reflux port is provided at the bottom of the cylinder body.

[0011] Furthermore, the length of the damping rod is steplessly adjustable.

[0012] Furthermore, a sealing rubber pad is sleeved on one end of the damping rod extending into the cylinder body and forms an interference fit with the cylinder body.

[0013] Furthermore, a rubber pad is attached to one end of the damping rod away from the cylinder body.

[0014] Furthermore, a sealing rubber pad is attached to the inner surface of the sleeve and is in close contact with the outer surface of the cylinder body.

[0015] Furthermore, the image recognition host can continuously inspect and control the position of the buffer energy absorption device and obtain the position of the hydraulic buffer device during the operation of the stamping machine in real time.

[0016] The present invention also provides a press machine, which includes an upper die, a lower die, a guide column, a lower die base, an image recognition component, a hydraulic oil supply system, a lifting cylinder group, an industrial computer and any of the above-mentioned progressive buffering energy absorption devices, wherein the progressive buffering energy absorption device and the lower die are fixed on the lower die base, one end of the guide column is fixed to the progressive buffering energy absorption device, and the other end is fixed to the upper die, the image shooting component is deployed next to the hydraulic cylinder to perform real-time image acquisition of the working status of the hydraulic cylinder; the image recognition component is electrically connected to the image shooting component, receives the picture it takes and determines the working status of the hydraulic cylinder; the lifting cylinder group is connected and fixed to the upper die, drives the upper die to rise and fall along the guide column, the hydraulic oil supply system is connected to the lifting cylinder group through a pipeline, and the industrial computer is connected to the image recognition component and the hydraulic oil supply system; receives the determination result of the image recognition component and drives the hydraulic oil supply system to work according to the recognition result.

[0017] The beneficial effects of the present invention are: (1) Speed ​​up production and improve production efficiency. In order to prevent impact and vibration during the operation of the servo press, it is often necessary to control the downward speed of the slider, which is conducive to the equipment to overcome the inertia force and brake the slider in time. Since the buffer energy absorption device provided by the present invention can generate and adjust the buffer force in real time in a feedback manner according to the punching force, providing a power source for the braking of the slider, there is no need to deliberately control the punching speed during the free downward stage of the press slider, thereby shortening the time consumed by a punching stroke, speeding up the production rhythm, and improving production efficiency; (2) The shock absorption and energy absorption effect is remarkable, and feedback adjustment is performed in real time. A series of damping holes with decreasing diameters from top to bottom are used to control the hydraulic pressure in the hydraulic chamber, thereby achieving real-time feedback adjustment of the buffering force of the buffering energy absorption device. In addition, a larger buffering force can be generated in the face of high loads, effectively reducing equipment vibration and absorbing collision energy. (3) The buffering and shock absorption effect is highly adaptable to the stamping process. According to different stamping process curves, the length of the damping rod and the amount of damping fluid are adjusted, and the buffering force range generated by the buffering energy absorption device during the operation of the press is set, so that the shock absorption effect of the device matches the stamping process, which not only meets the shock absorption requirements but also avoids energy waste; (4) Effectively deal with equipment overload and high stability. The buffer energy absorption devices provided by the present invention are distributed at the four corners of the press. When the equipment is overloaded during debugging or long-term service, the buffer energy absorption device on the corresponding overload side will play a role first. At the same time, the overload status is obtained by the industrial computer through the image recognition host. The industrial computer adjusts the working speed of the corresponding working cylinder group through the hydraulic oil supply system to actively eliminate the overload, which can minimize the losses caused by abnormal overload of the equipment and improve the stability of the equipment. (5) The damping fluid of the device can be recycled, the service life of the working components is long, and the maintenance cost is reduced. The device is provided with a damping fluid circulation loop, and the damping fluid can be reused after each stamping stroke. Compared with elastic damping components such as springs and rubber, the damping components of the present invention have a longer service life, which effectively reduces the manpower and economic costs of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the gradual buffering energy absorption device in the present invention; Figure 2 for Figure 1 Schematic diagram of the damping hole positions in all directions of the middle cylinder body; Figure 3 It is a schematic diagram of the working principle of the press system in the present invention; Among them: 1-hydraulic cylinder, 11-cylinder body, 12-damping hole, 13-damping liquid reflux port, 2-damping rod, 21-rubber pad, 3-sleeve, 100-adaptive anti-eccentric load vibration suppression device of press, 200-lower die, 300-upper die, 400-lower die base, 500-image shooting component, 600-image recognition component, 700-hydraulic oil supply system, 800-lifting cylinder group, 900-industrial computer. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0021] like Figure 1 As shown, an embodiment of the present invention provides a press machine adaptive anti-eccentric load vibration suppression device 100, which includes: A hydraulic cylinder 1, a damping rod 2, and a sleeve 3. The hydraulic cylinder 1 includes a cylinder body 11. A space for containing damping fluid is formed inside the cylinder body 11. A plurality of damping holes 12 are formed on the cylinder body 11. A piston is fixed to one end of the damping rod 2 and is embedded in the cylinder body 11 and can slide relative to the cylinder body 11. The sleeve 3 is fixed to the other end of the damping rod 2 and is sleeved on the hydraulic cylinder 1. The sleeve 3 can follow the movement of the damping rod 2 to cover or expose the damping holes 12 one by one.

[0022] The adaptive anti-eccentric load vibration suppression device for a press proposed in the present invention comprises a hydraulic cylinder 1, a damping rod 2, and a sleeve 3. The hydraulic cylinder 1 comprises a cylinder body 11, a space for containing damping fluid is formed inside the cylinder body 11, and a plurality of damping holes 12 are formed on the cylinder body 11; a piston is fixed on one end of the damping rod 2 and is embedded in the cylinder body 11 and can slide relative to the cylinder body 11; the sleeve 3 is fixedly connected to the other end of the damping rod 2 and is sleeved on the hydraulic cylinder 1; the sleeve 3 can follow the movement of the damping rod 2 to cover or expose the damping holes 12 one by one; when the pressure is relatively high, the sleeve 3 can follow the descending of the damping rod 2 to cover the damping holes 12 one by one, thereby increasing the outflow resistance of the damping fluid, so as to achieve the effect of increasing the damping and buffering force. This shock-absorbing method can absorb the collision energy generated by the stamping machine during operation, and its upper limit is extremely high without sacrificing production efficiency.

[0023] Specifically, the damping holes 12 are arranged along the height direction of the cylinder body 11, and the diameter of the damping holes 12 gradually decreases from high to low. The purpose of this design is to gradually increase the outflow resistance of the damping fluid during the descending process of the damping rod 2, so as to achieve the effect of increasing the damping and buffering force in sequence.

[0024] Specifically, the cylinder body 11 is cylindrical, and a plurality of damping holes 12 are provided on four sides evenly distributed every 90° in the circumferential direction. The purpose of such arrangement is to enable the cylinder body 11 to have damping holes 12 for discharging damping fluid in all directions, thereby avoiding the problem of eccentric loading caused by unilateral discharge.

[0025] Furthermore, the four side surfaces are opposite to each other, and the damping holes 12 on the two opposite side surfaces are matched one by one. The purpose of such arrangement is to make the cylinder body 11 have damping holes 12 for discharging damping fluid in opposite directions, and the discharge flow rates thereof are the same (same height and diameter) and opposite directions, and the impact forces thereof offset each other, thereby avoiding the problem of eccentric load caused by discharge of fluid.

[0026] Furthermore, a damping liquid return port 13 is opened at the bottom of the cylinder body 11 .

[0027] Furthermore, the length of the damping rod 2 is steplessly adjustable.

[0028] Furthermore, a sealing rubber pad is sleeved on one end of the damping rod 2 extending into the cylinder 11 and forms an interference fit with the cylinder 11. The purpose of this design is to prevent the damping fluid in the cylinder 11 from overflowing from the connection between the damping rod 2 and the cylinder 11.

[0029] Furthermore, a rubber pad 21 is attached to one end of the damping rod 2 away from the cylinder body 11 .

[0030] Furthermore, a sealing rubber pad is attached to the inner surface of the sleeve 3 and is in close contact with the outer surface of the cylinder 11. The purpose of this design is to prevent the damping fluid in the cylinder 11 from overflowing from the contact position between the sleeve 3 and the cylinder 11.

[0031] The present invention also provides a servo press, which includes the progressive buffering energy absorption device 100, an upper die 200, a lower die 300, a guide column, a lower die base 400, an image shooting component 500, an image recognition component 600, a hydraulic oil supply system 700, a lifting cylinder group 800, and an industrial computer 900. The progressive buffering energy absorption device 100 and the lower die 300 are fixed on the lower die base 500, one end of the guide column 400 is fixed to the damping rod 2, and the other end is fixed to the upper die 200, and the image shooting component 500 is deployed beside the hydraulic cylinder 1 to monitor the working state of the hydraulic cylinder 1. Real-time image acquisition is performed; the image recognition component 600 is electrically connected to the image shooting component 500, receives the pictures shot by it and determines the working status of the hydraulic cylinder 1; the lifting cylinder group 800 is connected and fixed to the upper mold 200, drives the upper mold 200 to rise and fall along the guide column, the hydraulic oil supply system 700 is connected to the lifting cylinder group 800 through a pipeline, and the industrial computer 900 is connected to the image recognition component 600 and the hydraulic oil supply system 700; receives the determination result of the image recognition component 600 and drives the hydraulic oil supply system 700 to work according to the recognition result.

[0032] Specifically, the image capturing component 500 is a conventional industrial camera, which is used to capture the working process of the hydraulic cylinder 1 .

[0033] Specifically, the image recognition component 600 is a conventional recognition module on the market, which is used to recognize the photos taken by the image capturing component 500 and determine the working state of the hydraulic cylinder 1 .

[0034] Specifically, the lifting cylinder group 800 includes a plurality of hydraulic cylinders, the movable ends of which are fixed to the upper mold 200 to drive the upper mold 200 to rise and fall in the vertical direction.

[0035] Specifically, the hydraulic oil supply system 700 is used to supply hydraulic oil to the lifting cylinder group 800 and is a conventional device on the market.

[0036] Specifically, the industrial computer 900 is used to receive the recognition result of the image recognition component 600 and drive the hydraulic oil supply system 700 to work. It is a conventional device on the market, such as a single-chip microcomputer control computer.

[0037] The present invention provides a press machine adaptive anti-eccentric load vibration suppression device and a servo press machine which can be used in the stamping forming of aluminum alloy automobile parts. The working process of the device is explained by taking the hot stamping forming of an aluminum alloy automobile B-pillar as an example. The material used is 7075 aluminum alloy plate, and a stamping test is carried out on a hot stamping production line. The working process is as follows: (1) Before stamping, first adjust the length of the damping rod 2 and the volume of the damping fluid in the cylinder 11 according to the set stamping process curve and the die height of the die, so as to adjust the damping range of the buffer energy absorption device during the stamping process. In the hot stamping process, the sheet metal is formed at a high temperature, the deformation resistance is small, and the required stamping force is also small. The volume of the damping fluid can be increased, or a larger diameter damping hole can be selected, so that the buffering force generated is relatively small; (2) The heated sheet metal is quickly transferred to the lower die 200, and the upper die 300 immediately moves downward. The upper die 300 can increase its speed in the free downward stage before contacting the sheet metal. The press machine adaptive anti-eccentric load vibration suppression device 100 first contacts the top block before the upper die 300 contacts the sheet metal, so that the damping rod 2 exerts an extrusion effect on the damping liquid in the cylinder 11, causing it to be squeezed out of the damping hole 12, thereby generating a certain reaction buffer force, thereby braking the movement of the upper die 300, and preventing the die from exerting an excessive rigid impact on the sheet metal; (3) Mold closing and stamping. During this process, the damping fluid is continuously squeezed out, as shown below: Figure 2 As shown, the damping holes are distributed in one direction every 90° in the circumference of the hydraulic cavity. The damping holes are distributed in a longitudinal lattice in four directions. The diameters in different directions are different and the diameters are getting smaller from top to bottom. In the downward process, the sleeve 3 gradually closes the damping hole 12 from top to bottom, so that the resistance to the damping liquid extrusion is getting bigger and bigger, so the buffering force generated is also getting bigger and bigger. When the mold is closed, its buffering effect can avoid the rigid collision between the molds, and absorb the collision energy to prevent the adverse effect on the precision of the stamping parts. (4) Offset load suppression. When off-set load occurs during the stamping process, the press machine's adaptive anti-off-set load vibration suppression devices 100 located at the four corners of the lower die 200 are not on the same horizontal plane. The image recognition component 600 monitors the position information of the press machine's adaptive anti-off-set load vibration suppression devices 100 in real time through the image capture component 500 and sends it to the industrial computer 900. The industrial computer 900 calculates the off-set load state and off-set load suppression strategy based on the information, and adjusts the working state of the lifting cylinder group 800 through the hydraulic oil supply system 700 to eliminate the off-set load.

[0038] (5) After the pressure holding is completed, the die returns. At this time, the buffer force can provide part of the return power. At the same time, the damping fluid flows back into the cylinder body 11 through the damping fluid return port 13 to be used for the next stamping stroke.

[0039] The beneficial effects of the present invention are: (1) Speed ​​up production and improve production efficiency. In order to prevent impact and vibration during the operation of the servo press, it is often necessary to control the downward speed of the slider, which is conducive to the equipment to overcome the inertia force and brake the slider in time. Since the buffer energy absorption device provided by the present invention can generate and adjust the buffer force in real time according to the punching force in a feedback manner, providing a power source for the braking of the slider, there is no need to deliberately control the punching speed during the free downward stage of the press slider, thereby shortening the time consumed by a punching stroke, speeding up the production rhythm, and improving production efficiency.

[0040] (2) The shock absorption and energy absorption effect is remarkable, and feedback adjustment is performed in real time. A series of damping holes with decreasing diameters from top to bottom are used to control the hydraulic pressure in the hydraulic chamber, thereby achieving real-time feedback adjustment of the buffering force of the buffering energy absorption device. In addition, a larger buffering force can be generated in the face of high loads, effectively reducing equipment vibration and absorbing collision energy.

[0041] (3) The buffering and shock absorption effect is highly adaptable to the stamping process. The length of the damping rod and the amount of damping fluid are adjusted according to different stamping process curves, and the buffering force range generated by the buffering energy absorption device during the operation of the press is set to match the shock absorption effect of the device with the stamping process, which not only meets the shock absorption requirements but also avoids energy waste.

[0042] (4) Effectively deal with equipment overload and high stability. The buffer energy absorption devices provided by the present invention are distributed at the four corners of the press. When the equipment is overloaded during debugging or long-term service, the buffer energy absorption device on the corresponding overload side will play a role first, and promptly feedback the overload situation to the equipment debugging or operating personnel. At the same time, it can use its own buffering force to adjust the overload situation to prevent the equipment from getting stuck and the press and stamping die from being damaged. It can minimize the losses caused by abnormal overload of the equipment and improve the stability of the equipment.

[0043] (5) The damping fluid of the device can be recycled, the service life of the working components is long, and the maintenance cost is reduced. The device is provided with a damping fluid circulation loop, and the damping fluid can be reused after each stamping stroke. Compared with elastic damping components such as springs and rubber, the damping components of the present invention have a longer service life, which effectively reduces the manpower and economic costs of maintenance.

[0044] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A press machine adaptive anti-eccentric load vibration suppression device, characterized in that: include: The hydraulic cylinder comprises a cylinder body, a space for containing damping fluid is formed inside the cylinder body, and a plurality of damping holes are formed on the cylinder body; A buffer damping rod, one end of which is fixed with a piston and is embedded in the cylinder body and can slide relative to the cylinder body; A buffer sleeve is fixed to the other end of the damping rod and sleeved on the hydraulic cylinder. The sleeve can follow the movement of the damping rod to cover or expose the damping holes one by one.

2. The press machine adaptive anti-eccentric load vibration suppression device according to claim 1, characterized in that: The buffer damping holes are arranged along the height direction of the cylinder body, and the diameters of the damping holes gradually decrease from high to low.

3. The press machine adaptive anti-eccentric load vibration suppression device according to claim 2, characterized in that: The cylinder body is cylindrical, and a plurality of damping holes are provided on the side surfaces at intervals of 90 degrees in the circumferential direction.

4. The press machine adaptive anti-eccentric load vibration suppression device according to claim 3, characterized in that: The four side surfaces are opposite to each other in pairs, and the damping holes on two opposite side surfaces are matched one by one.

5. The press machine adaptive anti-eccentric load vibration suppression device according to claim 1, characterized in that: A damping liquid reflux port is provided at the bottom of the cylinder body.

6. The press machine adaptive anti-eccentric load vibration suppression device according to claim 1, characterized in that: The length of the damping rod is steplessly adjustable.

7. The press machine adaptive anti-eccentric load vibration suppression device according to claim 1, characterized in that: A sealing rubber pad is sleeved on one end of the damping rod extending into the cylinder body and forms an interference fit with the cylinder body.

8. The press machine adaptive anti-eccentric load vibration suppression device according to claim 1, characterized in that: A rubber pad is attached to one end of the damping rod away from the cylinder body.

9. The press machine adaptive anti-eccentric load vibration suppression device according to claim 1, characterized in that: A sealing rubber pad is attached to the inner surface of the sleeve and is in close contact with the outer surface of the cylinder body.

10. A press system, characterized in that: It includes an upper mold, a lower mold, a guide column, a lower mold base, an image capture component, an image recognition component, a hydraulic oil supply system, a lifting cylinder group, an industrial computer and the progressive buffering energy absorption device described in any one of claims 1 to 9, wherein the progressive buffering energy absorption device and the lower mold are fixed on the lower mold base, one end of the guide column is fixed to the progressive buffering energy absorption device, and the other end is fixed to the upper mold, the image capture component is deployed next to the hydraulic cylinder to perform real-time image acquisition of the working status of the hydraulic cylinder; the image recognition component is electrically connected to the image capture component, receives the picture it captures and determines the working status of the hydraulic cylinder; the lifting cylinder group is connected and fixed to the upper mold to drive the upper mold to rise and fall along the guide column, the hydraulic oil supply system is connected to the lifting cylinder group through a pipeline, and the industrial computer is connected to the image recognition component and the hydraulic oil supply system; the determination result of the image recognition component is received and the hydraulic oil supply system is driven to work according to the recognition result.

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