Hydraulically driven constant pressure ball head pressurization device and method thereof

Abstract

The application discloses a kind of hydraulic drive constant pressure ball head pressurizing device and method thereof, belong to the field of rolling ball head pressurizing device.Device includes movable crossbeam module and constant hydraulic system module;Movable crossbeam module includes movable crossbeam and the processing ball head for rolling contact with the lower end surface of sample, movable crossbeam is connected with the constant hydraulic system module capable of providing vertical direction lifting force;The piston rod of constant hydraulic system module is ladder shaft structure, the cross section of middle section is greater than the cross section of bottom section;Piston rod can be sealed sliding in vertical direction under the location of piston sleeve and end cover, and piston sleeve, end cover, middle section bottom surface and bottom section form annular closed oil pressure action area;Oil pressure action area is communicated with oil circuit system for providing constant oil pressure.The application is under the action of constant hydraulic system module, and loading force is applied to ball head by hydraulic oil cylinder module, and the constant load of hydraulic loading output ensures that ball head does not jump under the condition of high-speed rolling processing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of rolling ball head pressing device, and particularly relates to a hydraulic driving constant pressure ball head pressing device and a method thereof. BACKGROUND

[0002] Rolling processing is a kind of chipless processing, and a certain pressure is applied to the workpiece surface by a certain form of rolling tool. At room temperature, the plastic deformation of metal is used to flatten the micro-unevenness of the workpiece surface, so as to change the surface structure, mechanical properties, shape and size. Therefore, this method can achieve the purposes of finishing and strengthening at the same time.

[0003] In the rolling processing, a great pressure and constant load need to be provided for the ball head, and the ball head needs to be ensured to reduce the jumping during the high-speed rolling process. However, the existing device cannot accurately control the output load because the contact area of the hydraulic cylinder is increased. Therefore, the present application proposes a method of using a hydraulic system as a power source, that is, the rolling ball head is installed on the movable cross beam connected with the hydraulic cylinder, so as to provide constant rolling pressure. SUMMARY

[0004] The present application aims to overcome the defects in the prior art and provide a hydraulic driving constant pressure ball head pressing device and a method thereof. The device of the present application is a rolling ball head pressing device using a hydraulic system to provide constant driving force, which can ensure that the load applied during the rolling processing is constant.

[0005] The specific technical solutions adopted by the present application are as follows:

[0006] In the first aspect, the present application provides a hydraulic driving constant pressure ball head pressing device, which comprises a movable cross beam module and a constant hydraulic system module.

[0007] The movable cross beam module comprises a movable cross beam and a processing ball head used for rolling contact with the lower end surface of the sample. The processing ball head is fixed to the movable cross beam through a ball head holder. The movable cross beam is connected with the constant hydraulic system module which can provide vertical lifting force. The vertical load between the processing ball head and the sample can be changed through the constant hydraulic system module.

[0008] The constant hydraulic system module comprises a piston rod, an end cover, a piston sleeve and a sealing ring; the piston rod is in a stepped shaft structure, comprising a top section, a middle section and a bottom section from top to bottom, the cross section of the middle section being larger than that of the bottom section; the top section is fixedly connected with the movable cross beam through a connecting piece fixed at the bottom of the movable cross beam; the middle section is coaxially and spacedly sleeved in the piston sleeve, and a sealing ring is arranged between the middle section and the piston sleeve; the bottom of the piston sleeve is provided with the end cover, the upper part of the bottom section is coaxially and spacedly sleeved in the end cover, and a sealing ring is arranged between the bottom section and the end cover; the piston rod can sealingly slide in the vertical direction under the limitation of the piston sleeve and the end cover, and an annular closed oil pressure action area is formed between the piston sleeve, the end cover, the bottom surface of the middle section and the bottom section; a hole is formed in the bottom section in the axial direction; one end of the hole is in communication with an oil circuit system for providing constant oil pressure, and the other end is in communication with the action area, and the piston rod can be provided with vertical force through the oil pressure in the oil pressure action area.

[0009] As preferred, the top of the processing ball head is embedded with a ball capable of freely rolling, and the rolling contact with the sample is realized through the ball.

[0010] As preferred, a plurality of linear bearings are symmetrically arranged on both sides of the movable cross beam, and the linear bearings can limit the vertical movement of the movable cross beam through guide columns.

[0011] As preferred, the piston sleeve is fixed on the table plate through a flange to realize multi-directional fixed limitation.

[0012] As preferred, the sealing ring is an O-shaped sealing ring, and the hole is in an L-shaped structure.

[0013] As preferred, the connecting piece is in a rotary body structure, and has a threaded hole connected with the piston rod in the inside.

[0014] As preferred, the end cover and the piston sleeve are fixedly connected through threads.

[0015] As preferred, the oil circuit system comprises an oil tank, a first oil circuit, a second oil circuit and a third oil circuit; the first oil circuit in communication with one end of the hole is provided with a constant displacement pump, a check valve, a throttle valve, a proportional pressure reducing valve and a first pressure gauge in sequence along the flow direction of the oil circuit, and the constant displacement pump is externally connected with a motor; an accumulator and a second pressure gauge are further arranged on the first oil circuit between the throttle valve and the proportional pressure reducing valve; a second oil circuit and a third oil circuit in communication with the oil tank are further arranged on the first oil circuit between the throttle valve and the proportional pressure reducing valve, a high-pressure ball valve is arranged on the second oil circuit, and an overflow valve is arranged on the third oil circuit.

[0016] Further, the proportional pressure reducing valve is an electromagnetic proportional pressure reducing valve, and the motor is a direct current motor.

[0017] Secondly, the present invention provides a pressurization method using the hydraulically driven constant pressure ball head pressurization device described in the first aspect, as follows:

[0018] Before pressurizing, bring the machined ball head into contact with the sample to be pressurized, so that the two can roll into contact; close the high-pressure ball valve and open the relief valve, check valve, throttle valve and proportional pressure reducing valve;

[0019] During pressurization, the motor is turned on to provide power to the metering pump, which then raises the pressure in the first oil circuit to the set pressure P of the relief valve. Hmax Then the motor is shut off; the relief valve acts as a protection circuit, when the pressure in the first oil circuit exceeds P. Hmax When the pressure is released, the relief valve will automatically release pressure; the system pressure P of the first oil circuit will be monitored in real time by the first pressure gauge. H If P H Not exceeding the set value P H0 When this happens, the motor is restarted to provide pressure to the first oil circuit; if P H Greater than the set value P H0 At that time, the pressure is reduced to the set pressure P through the proportional pressure reducing valve. L ;

[0020] Hydraulic oil is introduced into the oil pressure action zone through the hole at the bottom of the piston rod. The oil pressure generates an upward force on the annular area at the bottom of the middle section located in the oil pressure action zone. The piston rod is lifted upward, which drives the processing ball head to apply a load and pressure to the sample.

[0021] After the pressurization process is completed, open the high-pressure ball valve to release pressure from the first oil circuit.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The device of this invention, under the action of a constant hydraulic system module, applies a loading force to the ball head through a hydraulic cylinder module. The constant load output by the hydraulic loading ensures that the ball head does not bounce during high-speed rolling processing. This invention uses a stepped hydraulic cylinder, which has a smaller area for bearing hydraulic pressure, reducing the impact of hydraulic system errors and improving the accuracy of the output load. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a hydraulically driven pressurization device.

[0025] Figure 2 This is the front view of the constant hydraulic system module.

[0026] Figure 3 This is a schematic diagram of the oil circuit system.

[0027] Figure 4 This is a flowchart of the oil circuit system.

[0028] In the diagram: 1-machined ball head, 2-ball head cage, 3-linear bearing, 4-movable crossbeam, 5-connector, 6-piston rod, 7-flange, 8-piston sleeve, 9-end cap, 10-sealing ring, 11-first pressure gauge, 12-proportional pressure reducing valve, 13-accumulator, 14-second pressure gauge, 15-high pressure ball valve, 16-relief valve, 17-throttle valve, 18-check valve, 19-displacement pump, 20-motor, 21-oil tank. Detailed Implementation

[0029] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0030] like Figure 1 As shown, this invention provides a hydraulically driven constant-pressure ball head pressurizing device, which is used for working under constant pressure. The device mainly includes a movable crossbeam module and a constant hydraulic system module. The movable crossbeam module has a machined ball head for rolling contact with the lower end face of the sample, and also includes a linear bearing to restrict the freedom of the machined ball head and the movable crossbeam in the horizontal plane. The constant hydraulic system module includes a stepped-shaft hydraulic cylinder and an oil circuit system. The stepped-shaft hydraulic cylinder is connected to the movable crossbeam module and provides constant pressure through the oil circuit system, applying this pressure to the machined ball head, ultimately applying the load to the surface of the machined part through the ball head. The oil circuit system controls the working pressure inside the stepped-shaft hydraulic cylinder through the interaction of an electromagnetic proportional pressure reducing valve and two pressure gauges, and promptly replenishes pressure when a loss occurs.

[0031] The structure and connection method of each module will be explained in detail below.

[0032] The movable crossbeam module mainly includes a movable crossbeam 4 and a machined ball head 1. The machined ball head 1 is fixed to the movable crossbeam 4 by a ball head retainer 2 for rolling contact with the lower end face of the sample. In this embodiment, the ball head retainer 2 is fixed to the upper end face of the movable crossbeam 4 by three M10 bolts. The movable crossbeam module also includes linear bearings 3 and connecting parts 5. Two linear bearings 3 are symmetrically arranged on both sides of the upper end face of the movable crossbeam 4. Each linear bearing 3 is connected to the outside through a guide post to limit the vertical movement of the movable crossbeam 4, so that the movable crossbeam 4 can only move in the vertical direction. The movable crossbeam 4 is connected to a constant hydraulic system module that can provide vertical lifting force. The constant hydraulic system module can change the vertical load force between the machined ball head 1 and the sample.

[0033] like Figure 2As shown, the stepped shaft hydraulic cylinder mainly includes a piston rod 6, an end cap 9, a piston sleeve 8, and a sealing ring 10. The piston rod 6 has a stepped shaft structure, including a continuous top section, a middle section, and a bottom section from top to bottom, with the cross-section of the middle section being larger than that of the bottom section. The top section is fixedly connected to the movable crossbeam 4 via a connector 5, which is fixed to the bottom of the movable crossbeam 4. In this embodiment, the connector 5 can be a rotating body structure with internal threaded holes, and the piston rod 6 is interconnected with the movable crossbeam module via the connector 5. A bearing is installed inside the ball head 1, and a small ball is embedded in the top. The small ball can roll freely on the surface of the ball head 1 under the action of the bearing, thereby achieving rolling contact with the sample.

[0034] The middle section of piston rod 6 is coaxially spaced inside piston sleeve 8, with a sealing ring 10 between them. Piston rod 6 can slide vertically in a sealed manner under the constraint of piston sleeve 8. End cap 9 is located at the bottom of piston sleeve 8. The upper part of the bottom section is coaxially spaced inside end cap 9, with a sealing ring 10 between them. Piston rod 6 can slide vertically in a sealed manner under the constraint of end cap 9. Sealing ring 10 can be an O-ring. Piston sleeve 8, end cap 9, bottom surface of the middle section, and bottom section form an annular closed hydraulic pressure action zone. An axially oriented hole is formed in the bottom section. One end of the hole connects to an oil circuit system for providing constant oil pressure, and the other end connects to the action zone. The oil pressure within the hydraulic pressure action zone provides a vertical force to piston rod 6.

[0035] In this embodiment, the hole can be configured as an L-shaped hole structure, that is, the hole includes an interconnected vertical section and a horizontal section. One end of the vertical section is connected to the oil circuit system, and the other end is connected to the horizontal section. One end of the horizontal section is connected to the vertical section, and the other end is connected to the oil pressure application area. The piston sleeve 8 can be fixed to the table via the flange 7 to achieve multi-directional fixed positioning. The end cap 9 and the piston sleeve 8 are fixedly connected by threads. The lower end of the piston rod 6 has a tapered threaded hole for fixed connection with the oil circuit system.

[0036] like Figure 3As shown, the oil circuit system includes an oil tank 21, a first oil circuit, a second oil circuit, and a third oil circuit. The oil tank 21 is connected to one end of an orifice via the first oil circuit. Along the oil flow direction, the first oil circuit sequentially includes a metering pump 19, a one-way valve 18, a throttle valve 17, a proportional pressure reducing valve 12, and a first pressure gauge 11. The metering pump 19 is connected to an external motor 20, which can be a DC motor; the proportional pressure reducing valve 12 can be an electromagnetic proportional pressure reducing valve. The first oil circuit also includes an accumulator 13 and a second pressure gauge 14, located between the throttle valve 17 and the proportional pressure reducing valve 12. The first oil circuit located between the throttle valve 17 and the proportional pressure reducing valve 12 also includes a second oil circuit and a third oil circuit, both connected to the oil tank 21. The second oil circuit includes a high-pressure ball valve 15, and the third oil circuit includes an overflow valve 16. The first oil circuit is used to supply oil to the stepped shaft hydraulic cylinder under normal working conditions; the second oil circuit is used to release excess oil in the first oil circuit after the work is completed; and the third oil circuit is used to release some oil when the first oil circuit is over-pressurized, so as to maintain the first oil circuit within the safe oil pressure range.

[0037] like Figure 4 As shown, the pressurization method using the above-mentioned hydraulically driven constant pressure ball head pressurization device is as follows:

[0038] 1) Before pressurizing, bring the machined ball head 1 into contact with the sample to be pressurized, so that the two can roll into contact. Close the high-pressure ball valve 15, and open the overflow valve 16, check valve 18, throttle valve 17 and proportional pressure reducing valve 12.

[0039] 2) During pressurization, the motor 20 is turned on to provide power to the metering pump 19, which then raises the pressure in the first oil circuit to the set pressure P of the relief valve 16. Hmax Then, motor 20 is shut off. The relief valve 16 acts as a protection circuit in this system; when the high-pressure oil circuit pressure exceeds P... Hmax When this happens, the relief valve will automatically release pressure. The system pressure P of the first oil circuit is monitored in real time by the first pressure gauge 11. H If P H Not exceeding the set value P H0 At that time, restart motor 20 to provide pressure to the first oil circuit. If P H Greater than the set value P H0 At that time, the pressure is reduced to the set pressure P through the proportional pressure reducing valve 12. L .

[0040] Keep the pressure constant at P L Hydraulic oil is introduced into the oil pressure zone through the hole at the bottom of the piston rod 6. The oil pressure generates an upward force on the annular area at the bottom of the middle section located in the oil pressure zone. The piston rod 6 drives the movable crossbeam 4 to rise, and then applies a load to the sample through the processed ball head 1.

[0041] 3) After the pressurization work is completed, open the high-pressure ball valve 15 to release pressure in the first oil circuit.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A hydraulically driven constant pressure ball head pressurization device, characterized in that, Includes a movable crossbeam module and a constant hydraulic system module; The movable crossbeam module includes a movable crossbeam (4) and a machined ball head (1) for rolling contact with the lower end face of the sample. The machined ball head (1) is fixed to the movable crossbeam (4) by a ball head holder (2). The movable crossbeam (4) is connected to a constant hydraulic system module that can provide vertical lifting force. The constant hydraulic system module can change the vertical load force between the machined ball head (1) and the sample. The constant hydraulic system module includes a piston rod (6), an end cap (9), a piston sleeve (8), and a sealing ring (10); the piston rod (6) has a stepped shaft structure, including a top section, a middle section, and a bottom section that run continuously from top to bottom, with the cross-section of the middle section being larger than that of the bottom section; the top section is fixedly connected to the movable crossbeam (4) via a connector (5) fixed to the bottom of the movable crossbeam (4); the middle section is coaxially spaced inside the piston sleeve (8), with a sealing ring (10) between them; the piston sleeve (8) has an end cap (9) at the bottom, and the piston rod (6) has a sealing ring (10) at the bottom. The upper part of the bottom section is coaxially spaced inside the end cap (9) and a sealing ring (10) is provided between them; the piston rod (6) can slide vertically in a sealed manner under the limitation of the piston sleeve (8) and the end cap (9), and the piston sleeve (8), the end cap (9), the bottom surface of the middle section and the bottom section form an annular closed oil pressure action zone; a hole is opened in the bottom section along the axial direction; one end of the hole is connected to the oil circuit system for providing constant oil pressure, and the other end is connected to the action zone, and the oil pressure in the oil pressure action zone can provide a vertical force on the piston rod (6); The oil circuit system includes an oil tank (21), a first oil circuit, a second oil circuit, and a third oil circuit. The oil tank (21) is connected to one end of the hole through a first oil circuit, which is provided in sequence along the oil circuit flow direction with a metering pump (19), a check valve (18), a throttle valve (17), a proportional pressure reducing valve (12), and a first pressure gauge (11). The metering pump (19) is connected to an external motor (20). An accumulator (13) and a second pressure gauge (14) are also provided on the first oil circuit between the throttle valve (17) and the proportional pressure reducing valve (12). A second oil circuit and a third oil circuit, which are connected to the oil tank (21), are also provided on the first oil circuit between the throttle valve (17) and the proportional pressure reducing valve (12). A high-pressure ball valve (15) is provided on the second oil circuit, and an overflow valve (16) is provided on the third oil circuit.

2. The hydraulically driven constant pressure ball head pressurization device according to claim 1, characterized in that, The top of the processed ball head (1) is embedded with a ball that can roll freely, and the ball achieves rolling contact with the sample.

3. The hydraulically driven constant pressure ball head pressurization device according to claim 1, characterized in that, The movable crossbeam (4) is also symmetrically provided with several linear bearings (3) on both sides. The linear bearings (3) can limit the vertical movement of the movable crossbeam (4) through the guide post.

4. The hydraulically driven constant pressure ball head pressurizing device according to claim 1, characterized in that, The piston sleeve (8) is fixed to the table via flange (7) to achieve multi-directional fixed positioning.

5. The hydraulically driven constant pressure ball head pressurization device according to claim 1, characterized in that, The sealing ring (10) is an O-ring; the hole is an L-shaped structure.

6. The hydraulically driven constant pressure ball head pressurization device according to claim 1, characterized in that, The connector (5) is a rotating structure with a threaded hole inside that connects to the piston rod (6).

7. The hydraulically driven constant pressure ball head pressurizing device according to claim 1, characterized in that, The end cap (9) and the piston sleeve (8) are fixedly connected by threads.

8. The hydraulically driven constant pressure ball head pressurization device according to claim 1, characterized in that, The proportional pressure reducing valve (12) is an electromagnetic proportional pressure reducing valve, and the motor (20) is a DC motor.

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