CN115370627A - Active flexible stabilizing system for turning of slender rod - Google Patents
Active flexible stabilizing system for turning of slender rod Download PDFInfo
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- CN115370627A CN115370627A CN202210903075.5A CN202210903075A CN115370627A CN 115370627 A CN115370627 A CN 115370627A CN 202210903075 A CN202210903075 A CN 202210903075A CN 115370627 A CN115370627 A CN 115370627A
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 166
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 87
- 230000007246 mechanism Effects 0.000 claims abstract description 78
- 238000013016 damping Methods 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000003381 stabilizer Substances 0.000 claims description 42
- 238000003754 machining Methods 0.000 claims description 41
- 239000003921 oil Substances 0.000 claims description 40
- 238000006073 displacement reaction Methods 0.000 claims description 37
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 230000002829 reductive effect Effects 0.000 claims description 28
- 230000033001 locomotion Effects 0.000 claims description 21
- 230000006641 stabilisation Effects 0.000 claims description 17
- 238000011105 stabilization Methods 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 15
- 238000013459 approach Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 230000002195 synergetic effect Effects 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/26—Fluid-pressure drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides an active flexible stabilizing system for turning of a slender rod, which comprises a stabilizing rack arranged on a lathe rack, wherein a plurality of bosses are arranged on the stabilizing rack, upper connecting bases are arranged on the bosses, the upper connecting bases are connected with one end of a connecting arm, the other end of the connecting arm is connected with a lower connecting base, the lower connecting base is connected with a stabilizing wheel, a double-acting single-rod servo hydraulic cylinder is arranged on each upper connecting base, and a piston rod of the double-acting single-rod servo hydraulic cylinder is connected with the connecting arm through a connecting lug ring. The hydraulic servo control device has the advantages that the support to different directions of a workpiece is realized through a plurality of independent flexible stabilizing mechanisms, each flexible stabilizing mechanism is driven by one servo hydraulic cylinder, the hydraulic oil pressure of two cavities of the servo hydraulic cylinders is adjusted through the servo reversing valve and the proportional overflow valve, the independent control to the servo hydraulic cylinders is realized, the servo hydraulic cylinders have better damping characteristics, the vibration in the turning process of the slender rod can be effectively restrained, and the processing precision of the workpiece is improved.
Description
Technical Field
The application belongs to the field of lathe machining hydraulic control, and particularly relates to an active flexible stabilizing system for turning of a slender rod.
Background
When a traditional horizontal lathe is used for processing a long and thin rod workpiece, a fixing mode that a three-jaw chuck and two ends of a tailstock are clamped is adopted, when a turning tool performs cutting motion on the processed workpiece, one side of the processed workpiece is subjected to a backward force from the turning tool, the processed workpiece is easy to deform and vibrate under the effect of the backward force, the processing precision of the workpiece is seriously restricted by the processing deformation, and the processing quality of the workpiece is reduced.
Disclosure of Invention
Aiming at the problems, the patent provides an active flexible stabilizing system for turning of a slender rod, the central axis of a stabilizing wheel is parallel to the rotation axis of a workpiece through a servo hydraulic cylinder driving a parallel four-bar linkage mechanism, the support and stabilization effects on the machined workpieces with different sizes are realized through independently adjusting the output force and the output displacement of the servo hydraulic cylinder of each flexible stabilizing mechanism, the machining rigidity of the workpieces is improved, meanwhile, each servo hydraulic cylinder has a good damping characteristic, the vibration of the slender rod in the machining process can be restrained, and the machining precision of the workpieces is improved. The technical scheme is as follows:
the utility model provides a slender pole lathe work is with flexible stable system of initiative, is including installing the stable frame in the lathe frame, be equipped with a plurality of bosss in the stable frame, be equipped with connection base on the boss, it is connected with the one end of linking arm to go up connection base, the other end and the lower connection pedestal connection of linking arm, connection base is connected with the stabilizer wheel down, every go up all be equipped with two effects on the connection base and singly go out pole servo hydraulic cylinder, two effects are singly gone out the piston rod of pole servo hydraulic cylinder and are connected with the linking arm through connecting the earrings, the stabilizer wheel is used for stably processing the work piece.
Preferably, the stabilizer wheel comprises a stabilizer wheel side supporting arm, a stabilizer wheel base, a stabilizer wheel central shaft, a stabilizer wheel spoke and a stabilizer wheel buffer layer, wherein the stabilizer wheel side supporting arm is fixedly connected with the stabilizer wheel base, one end of the stabilizer wheel side supporting arm, which is far away from the stabilizer wheel base, is provided with a circular mounting hole, the stabilizer wheel central shaft is mounted in the circular hole of the stabilizer wheel side supporting arm through a sliding bearing, and the stabilizer wheel spoke is mounted on the stabilizer wheel central shaft through a key connection; the outer edge of the wheel spoke of the stabilizing wheel is provided with a stabilizing wheel buffer layer, and the lower connecting base is fixedly connected with the stabilizing wheel base through a bolt.
Preferably, the four connecting arms are arranged between the upper connecting base and the lower connecting base, the four connecting arms, the upper connecting base and the lower connecting base form a parallel four-bar mechanism, a connecting lug ring at one end of a rodless cavity of the double-acting single-rod servo hydraulic cylinder is provided with a ball hinge, the ball hinge is connected with the upper connecting base through a connecting pin shaft, a piston rod lug ring of the double-acting single-rod servo hydraulic cylinder is provided with a ball hinge, and the ball hinge is connected with the lower end of the connecting arm through a connecting pin shaft.
Preferably, a rodless cavity of each double-acting single-rod servo hydraulic cylinder is connected with a proportional speed regulating valve, a proportional overflow valve and a pressure sensor through a first stop valve, a rod cavity of each double-acting single-rod servo hydraulic cylinder is connected with a second stop valve, a displacement sensor is arranged in each double-acting single-rod servo hydraulic cylinder, the second stop valve is connected with the second pressure sensor and an A port of a servo reversing valve, a P port of the servo reversing valve is connected with an oil source, a T port of the servo reversing valve is connected with an oil tank, a B port of the servo reversing valve is in a cut-off state, the proportional speed regulating valve is connected with the oil source, and the proportional overflow valve is connected with the oil tank.
Further preferably, the position control process of the active flexible stabilization mechanism is as follows:
the servo reversing valve is in a left position, high-pressure oil in an oil source flows out from a port B of the proportional speed regulating valve after being regulated by the proportional speed regulating valve, when the pressure of the hydraulic oil flowing out from the port B of the proportional speed regulating valve is lower than the preset valve opening pressure of the proportional overflow valve, the hydraulic oil flowing out from the port B of the proportional speed regulating valve flows into a first pressure sensor and a first stop valve respectively, the hydraulic oil flows into a rodless cavity of the double-acting single-rod servo hydraulic cylinder through the first stop valve, a piston of the double-acting single-rod servo hydraulic cylinder does extension movement, the hydraulic oil flows into a second stop valve through the port B of the second stop valve, the hydraulic oil flows into a second pressure sensor and the servo reversing valve, the hydraulic oil directly flows into an oil tank through a port T of the servo reversing valve, when the displacement sensor detects that an active flexible stabilizing mechanism approaches a processing workpiece, a valve core of the servo reversing valve is switched to a right position, the high-pressure oil in the oil source is communicated with a rod cavity of the double-acting single-rod servo hydraulic cylinder, and the extension speed of the piston of the servo hydraulic cylinder is reduced by increasing the pressure in the rod cavity of the servo hydraulic cylinder; when the displacement sensor detects that the active flexible stabilizing mechanism moves to a designated position, the servo reversing valve is switched to a middle position, and the double-acting single-rod servo hydraulic cylinder is in a locking state, so that the position control function of the active flexible stabilizing mechanism is realized.
Further preferably, the supporting force control process of the active flexible stabilizing mechanism is as follows:
the servo reversing valve is positioned on the right, a rod cavity of the double-acting single-rod servo hydraulic cylinder is communicated with an oil source, when the supporting force needs to be increased, the valve opening pressure of the proportional overflow valve is increased according to a pressure signal of the pressure sensor I, the output pressure of the hydraulic oil at the port B of the proportional speed control valve is increased through the synergistic effect of the proportional speed control valve and the proportional overflow valve, the output pressure of the hydraulic oil at the port A of the reversing valve is reduced by controlling the valve core position of the servo reversing valve according to a pressure signal of the pressure sensor II, and the control of the output force of the double-acting single-rod servo hydraulic cylinder is realized by adjusting the pressure of the hydraulic oil in the rodless cavity and the rod cavity of the double-acting single-rod servo hydraulic cylinder.
Further preferably, the resetting process of the active flexible stabilization mechanism is as follows:
the servo reversing valve is in the right position, the proportional speed regulating valve is regulated to enable a valve port of the proportional speed regulating valve to be in a closed state, the valve opening pressure of the proportional overflow valve is reduced, hydraulic oil in an oil source flows into the servo reversing valve through a port P of the servo reversing valve, the hydraulic oil flows out from a port A of the servo reversing valve, the hydraulic oil flowing out from the port A of the servo reversing valve respectively flows into the pressure sensor II and the stop valve II, the hydraulic oil flows into a rod cavity of the double-acting single-rod servo hydraulic cylinder through the stop valve II, a piston of the double-acting single-rod servo hydraulic cylinder does retraction movement, the hydraulic oil in a rodless cavity of the double-acting single-rod servo hydraulic cylinder flows into the pressure sensor I and the proportional overflow valve respectively through the port A of the stop valve I, the hydraulic oil directly flows back into an oil tank through a port B of the double-acting single-rod servo hydraulic cylinder after passing through the proportional overflow valve I, when the displacement sensor detects that the piston of the double-acting single-rod servo hydraulic cylinder is close to the initial position, the valve opening pressure of the proportional overflow valve is increased, the valve is regulated, the pressure of the proportional overflow valve is regulated to realize the pressure regulation of the maximum valve of the double-acting servo hydraulic cylinder when the displacement sensor is reset, the initial position of the servo hydraulic cylinder, and the servo hydraulic cylinder, the servo hydraulic cylinder is reset function of the servo hydraulic cylinder.
Further preferably, the motion process of the active flexible stabilization mechanism is as follows:
the machining workpiece rotates at a constant speed under the drive of a spindle box of a machine tool, the active flexible stabilizing mechanism starts to move under the drive of the double-acting single-rod servo hydraulic cylinder, a piston rod of the double-acting single-rod servo hydraulic cylinder transmits the motion to a connecting arm through a spherical hinge, a lower connecting base is continuously close to the machining workpiece under the action of the connecting arm, the stabilizing wheel translates along with the lower connecting base, when the detecting stabilizing wheel moves to the position close to the workpiece, the motion speed of the active flexible stabilizing mechanism is reduced by adjusting the state of a servo reversing valve, so that the stabilizing wheel slowly approaches to the machining workpiece, after the stabilizing wheel contacts with the workpiece, the stabilizing wheel buffer layer rotates along with the workpiece, the stabilizing wheel spokes move along with the stabilizing wheel buffer layer, the stabilizing wheel spokes drive the stabilizing wheel central shaft to rotate through key connection, sliding bearings are arranged at two ends of the stabilizing wheel central shaft, the stabilizing wheel central shaft moves in the sliding bearings, a turning tool starts to cut the workpiece, and the hydraulic system independently adjusts the supporting force of each active flexible stabilizing mechanism according to the stress state of the machining workpiece, so as to ensure the rigidity of the workpiece in the machining process; the vibration displacement generated by the workpiece in the machining process is transmitted to the lower connecting base through the stabilizing wheel buffer layer, the lower connecting base further transmits the vibration to a piston rod of the servo hydraulic cylinder, the double-acting single-rod servo hydraulic cylinder provides a damping force for the flexible stabilizing mechanism, and the flexible stabilizing mechanism can effectively inhibit the vibration of the workpiece and ensure the stability of the flexible stabilizing mechanism; when the lathe tool finishes the processing operation on the workpiece, the active flexible stabilizing mechanism is quickly reset under the action of the piston rod of the double-acting single-rod servo hydraulic cylinder, the piston rod of the double-acting single-rod servo hydraulic cylinder drives the lower connecting base to be quickly away from the processed workpiece, and the stabilizing wheel is separated from the processed workpiece; when the displacement sensor detects that the piston of the double-acting single-rod servo hydraulic cylinder is close to the initial position, the movement speed of the piston rod of the double-acting single-rod servo hydraulic cylinder is reduced by adjusting the state of the servo reversing valve, and when the active flexible stabilizing mechanism reaches the initial position, the piston rod of the double-acting single-rod servo hydraulic cylinder is in a static state through a hydraulic valve group in the adjusting system, so that the whole movement process of the active flexible stabilizing mechanism in the workpiece machining process is completed.
Further preferably, the force transmission process of the active flexible stabilization mechanism is as follows:
before a lathe tool turns a workpiece, the active flexible stabilizing mechanism moves from an initial position to a working position, a piston rod of the double-acting single-rod servo hydraulic cylinder starts to extend out under the action of hydraulic oil in a rodless cavity of the double-acting single-rod servo hydraulic cylinder, the piston rod of the double-acting single-rod servo hydraulic cylinder outputs a supporting force, the supporting force is transmitted to the connecting arm through the spherical hinge, the lower connecting base continuously approaches to the workpiece to be machined under the action of the connecting arm, the lower connecting base drives the stabilizing wheel to move together, when the stabilizing wheel contacts with the workpiece to be machined, the stabilizing wheel applies the supporting force to the workpiece, when all the active flexible stabilizing mechanisms contact with the workpiece, the lathe tool starts to turn the workpiece, at the moment, the workpiece simultaneously receives the turning force of the lathe tool and the stable supporting force of the three active flexible stabilizing mechanisms, the state of the servo reversing valve is adjusted according to the moving state and the stress state of the workpiece, the independent control of the stable supporting force in each direction is realized, and the machining stability of the workpiece is ensured; in the process of turning a workpiece by a turning tool, the workpiece can generate machining vibration, the double-acting single-rod servo hydraulic cylinder has a good damping characteristic and can effectively inhibit the machining vibration of the workpiece, in the process of the workpiece vibration, the double-acting single-rod servo hydraulic cylinder outputs a damping force, the damping force is transmitted to the stabilizing wheel through the lower connecting base, the damping force is transmitted to the stabilizing wheel spoke through the stabilizing wheel side supporting arm, the damping force transmitted to the stabilizing wheel spoke is transmitted to the workpiece through the stabilizing wheel buffer layer, the damping force transmitted to the workpiece is used for inhibiting the vibration of the workpiece caused by machining, and the stabilizing wheel buffer layer is made of nylon materials and can further absorb the vibration and play a role in protecting the workpiece; when a turning tool finishes turning a workpiece, the active flexible stabilizing mechanism is required to return to an initial position, a piston rod of the double-acting single-rod servo hydraulic cylinder starts to retract under the action of hydraulic oil in a rod cavity of the double-acting single-rod servo hydraulic cylinder, the piston rod of the double-acting single-rod servo hydraulic cylinder outputs a pulling force, the pulling force output by the piston rod of the double-acting single-rod servo hydraulic cylinder is transmitted to a connecting arm through a spherical hinge connected with the connecting arm, the connecting arm transmits the force to a lower connecting base through a connecting pin shaft, the lower connecting base starts to be away from the workpiece to be machined, a stabilizing wheel moves along with the lower connecting base and is separated from the workpiece, when a displacement sensor detects that the piston rod of the double-acting single-rod servo hydraulic cylinder returns to the initial position, the state of a valve group in a hydraulic system is adjusted to stop the piston rod of the double-acting single-rod servo hydraulic cylinder, and the force transmission process analysis of the active flexible stabilizing mechanism is finished.
Advantageous effects
This patent provides a slender rod lathe work is with initiative flexible stable system, realizes the support to the different directions of work piece through three independent flexible stable mechanism, and wherein every flexible stable mechanism is driven by a servo hydraulic cylinder, adjusts the hydraulic oil pressure in two chambeies of servo hydraulic cylinder through servo reversing valve and proportional relief valve, realizes the independent control to servo hydraulic cylinder.
This patent novelty provides an initiative flexible stable system for slender rod lathe work, through the parallel four-bar linkage of servo hydraulic cylinder drive, realize stabilizer wheel the central axis and parallel with the work piece rotation axis, output and output displacement through the servo hydraulic cylinder of every flexible stable mechanism of independent regulation, realize the support and the stabilizing action to the processing work piece of equidimension not, improve the processing rigidity of work piece, every servo hydraulic cylinder has better damping characteristic simultaneously, can restrain the vibration of slender rod in the course of working, improve the machining precision of work piece.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of a structure of a stabilizer wheel;
FIG. 4 is a diagram of the hydraulic system of the present application;
fig. 5 is a schematic diagram of the stress of the workpiece being processed.
In the figure, 1-a pressure sensor I, 2-a stop valve I A, 3-a stop valve I B, 4-a stop valve I C, 5-a displacement sensor A, 6-a displacement sensor B, 7-a displacement sensor C, 8-a double-acting single-rod servo hydraulic cylinder I, 9-a double-acting single-rod servo hydraulic cylinder II, 10-a double-acting single-rod servo hydraulic cylinder III, 11-a stop valve II A, 12-a stop valve II B, 13-a stop valve II C, 14-a three-position four-way servo reversing valve I, 15-a three-position four-way servo reversing valve II, 16-a three-position four-way servo reversing valve III, 17-a pressure sensor II A, 18-a pressure sensor II B, 19-a pressure sensor II C, 20-a proportional overflow valve, 21-a proportional speed regulating valve, 22-an oil source, 23-an oil tank, 24-an upper connecting base, 25-a connecting arm, 26-a connecting pin shaft, 27-a stabilizing frame, 28-a lower connecting base, 29-a stabilizing wheel, 30-a connecting pin shaft and 31-a machining workpiece.
The stabilizer includes a stabilizer base 291, a stabilizer side support arm 292, a stabilizer center shaft 293, a stabilizer spoke 294, and a stabilizer cushion 295.
Detailed Description
The following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application.
The mechanical structure of the system is as follows: the main body of the stabilizing frame 27 is of a hollow cylindrical structure, three rectangular bosses are uniformly distributed in the main body, and bolt holes for connecting the upper connecting base 24 are formed in the rectangular bosses; four circular holes for mounting the connecting arms 25 are formed in two sides of the upper connecting base 24, connecting lug rings for connecting a double-acting single-rod servo hydraulic cylinder are arranged in the center of the upper connecting base 24, and the upper connecting base 24 is connected with the rack 27 through bolts; four circular holes for installing the connecting arm 25 are formed in two sides of the lower connecting base 28, a connecting lug ring for connecting a double-acting single-rod servo hydraulic cylinder is arranged in the center of the lower connecting base, and one end of the connecting arm 25 is connected with the upper connecting base 24 through a connecting pin shaft 26; the other end of the connecting arm 25 is connected with a lower connecting base 28 through a connecting pin shaft 30; the four connecting arms, the upper connecting base 24 and the lower connecting base 28 form a parallel four-bar mechanism together; a ball hinge is arranged on a connecting lug ring at one end of a rodless cavity of the double-acting single-rod servo hydraulic cylinder, the ball hinge is connected with the upper connecting base 24 through a connecting pin shaft, a ball hinge is arranged on a connecting lug ring of a piston rod of the double-acting single-rod servo hydraulic cylinder, and the ball hinge is connected with the lower end of a connecting arm 25 through a connecting pin shaft; the stabilizing wheels 29 are connected with the lower connecting base 28 through bolts; wherein stabilizer wheel side support arms 292 of the stabilizer wheels 29 are connected with the stabilizer wheel mounts 291 by bolts; one end of the stabilizing wheel side supporting arm 292, which is far away from the stabilizing wheel base 291, is provided with a round hole, the stabilizing wheel central shaft 293 is installed in the round hole of the stabilizing wheel base 291 through a sliding bearing, and the stabilizing wheel spoke 294 is installed on the stabilizing wheel central shaft 293 through a key connection; the outer edge of the wheel spoke 294 is provided with a stabilizing wheel buffer layer 295, and the stabilizing wheel buffer layer 295 is made of nylon.
The three stabilizing wheels are driven by three double-acting single-rod servo hydraulic cylinders and three servo reversing valves corresponding to the three stabilizing wheels, and are respectively a double-acting single-rod servo hydraulic cylinder I8, a double-acting single-rod servo hydraulic cylinder II 9 and a double-acting single-rod servo hydraulic cylinder III 10; the servo reversing valves are three-position four-way servo reversing valves, namely a three-position four-way servo reversing valve I14, a three-position four-way servo reversing valve II 15 and a three-position four-way servo reversing valve III 16.
A system hydraulic circuit: the oil tank 23 is respectively connected with a port B of the proportional overflow valve 20, a port T of the three-position four-way servo reversing valve III 16, a port T of the three-position four-way servo reversing valve II 15 and a port T of the three-position four-way servo reversing valve I14; the oil source 22 is respectively connected with the port A of the proportional speed regulating valve 21, the port P of the three-position four-way servo reversing valve III 16, the port P of the three-position four-way servo reversing valve II 15 and the port P of the three-position four-way servo reversing valve I14, and the port B of the proportional speed regulating valve 21 is respectively connected with the port A of the proportional overflow valve 20, the port A of the pressure sensor I1, the port A of the stop valve I A2, the port A of the stop valve I B3 and the port A of the stop valve I C4; the port B of the first stop valve A2 is connected with the port A of the first double-acting single-rod servo hydraulic cylinder 8; a port B of the double-acting single-rod servo hydraulic cylinder I8 is connected with a port A of the stop valve II A11; the port B of the second stop valve A11 is respectively connected with the port A of the second pressure sensor A17 and the port A of the first three-position four-way servo reversing valve 14; a port B of the first stop valve B3 is connected with a port A of a double-acting single-rod servo hydraulic cylinder II 9; a port B of the double-acting single-rod servo hydraulic cylinder II 9 is connected with a port A of a stop valve II B12; the port B of the second stop valve B12 is respectively connected with the port A of the second pressure sensor B18 and the port A of the third three-position four-way servo reversing valve 15; the port B of the first stop valve C4 is connected with the port A of the double-acting single-rod servo hydraulic cylinder III 10; a port B of the double-acting single-rod servo hydraulic cylinder III 10 is connected with a port A of the stop valve II C13; and a port B of the second stop valve C13 is respectively connected with a port A of the second pressure sensor C19 and a port A of the third three-position four-way servo reversing valve C16.
The displacement sensor A5 measures the displacement of a piston rod of a double-acting single-rod servo hydraulic cylinder I8; the displacement sensor B6 measures the displacement of a piston rod of the double-acting single-rod servo hydraulic cylinder II 9; the displacement sensor C7 measures the displacement of the piston rod of the double-acting single-rod servo hydraulic cylinder three 10.
When the first three-position four-way servo reversing valve 14, the second three-position four-way servo reversing valve 15 and the third three-position four-way servo reversing valve 16 are in the left position, the port A and the port T are in a conduction state, and the port B and the port P are in a conduction state; when the port A, the port B, the port P and the port T are in a disconnected state; when the switch is at the right position, the port A and the port P are in a conducting state, and the port B and the port T are in a conducting state.
Position control function of the active flexible stabilization mechanism: when the pressure of the hydraulic oil flowing out of the port B of the proportional speed regulating valve 21 is lower than the preset valve-opening pressure of the proportional overflow valve 20, the hydraulic oil flowing out of the port B of the proportional speed regulating valve 21 flows into the pressure sensor I1 through the port A of the pressure sensor I1, flows into the stop valve I A2 through the port A of the stop valve I A2, flows into the stop valve I B3 through the port A of the stop valve I B3, and flows into the stop valve I C4 through the port A of the C4; the hydraulic oil flows out from the port B of the first stop valve A2 through the port A of the first double-acting single-rod servo hydraulic cylinder 8, the hydraulic oil flowing out from the port B of the first stop valve A2 flows into the rodless cavity of the first double-acting single-rod servo hydraulic cylinder 8 through the port A of the first double-acting single-rod servo hydraulic cylinder 8, the piston rod of the first double-acting single-rod servo hydraulic cylinder 8 makes extension movement, the hydraulic oil in the rod cavity of the first double-acting single-rod servo hydraulic cylinder 8 flows out from the port B thereof, the hydraulic oil flowing out from the port B of the first double-acting single-rod servo hydraulic cylinder 8 flows into the second stop valve A11 through the port A of the second stop valve A11, the hydraulic oil flowing out from the port B of the second stop valve A11 flows into the second pressure sensor A17 through the port A of the second pressure sensor A17 respectively, the hydraulic oil flows into the first three-position four-way servo reversing valve 14 through an A port of the first three-position four-way servo reversing valve 14, the hydraulic oil directly flows into the oil tank 23 through a T port of the first three-position four-way servo reversing valve 14 after passing through the first three-position four-way servo reversing valve 14, when a first displacement sensor A5 detects that a stabilizing wheel 29 approaches a machining workpiece 31, a valve core of the first three-position four-way servo reversing valve 14 is switched to the right position, high-pressure oil in an oil source 22 is communicated with a rod cavity of the first double-acting single-rod servo hydraulic cylinder 8, and the pressure of the hydraulic oil in the rod cavity of the first double-acting single-rod servo hydraulic cylinder 8 is adjusted by adjusting the position of the valve core of the first three-position four-way servo reversing valve 14 according to a pressure signal of a second pressure sensor A17, so that the extension speed of a piston rod of the first double-acting single-rod servo hydraulic cylinder 8 is reduced; the hydraulic oil flows out from the port B of the first stop valve B3 after passing through the port B, the hydraulic oil flowing out from the port B of the first stop valve B3 flows into the rodless cavity of the second double-acting single-rod servo hydraulic cylinder second 9 through the port A of the second double-acting single-rod servo hydraulic cylinder second 9, the piston rod of the second double-acting single-rod servo hydraulic cylinder second 9 makes an extending motion, the hydraulic oil in the rod cavity of the second double-acting single-rod servo hydraulic cylinder second 9 flows out from the port B thereof, the hydraulic oil flowing out from the port B of the second double-acting single-rod servo hydraulic cylinder second 9 flows into the second stop valve B12 through the port A of the second stop valve B12, the hydraulic oil flowing out from the port B of the second stop valve B12 flows into the second pressure sensor B18 through the port A of the second pressure sensor B18 respectively, the hydraulic oil flows into the second three-position four-way servo reversing valve 15 through an opening A of the second three-position four-way servo reversing valve 15, the hydraulic oil directly flows into the oil tank 23 through an opening T of the second three-position four-way servo reversing valve 15 after passing through the second three-position four-way servo reversing valve 15, when the displacement sensor B6 detects that the stabilizing wheel 29 is close to a machined workpiece 31, the valve core of the second three-position four-way servo reversing valve 15 is switched to the right position, high-pressure oil in the oil source 22 is communicated with the rod cavity of the second double-acting single-rod servo hydraulic cylinder 9, the pressure of the hydraulic oil in the rod cavity of the second double-acting single-rod servo hydraulic cylinder 9 is adjusted by adjusting the position of the valve core of the second three-position four-way servo reversing valve 15 according to a pressure signal of the second pressure sensor B18, and the extension speed of a piston rod of the second double-acting single-rod servo hydraulic cylinder 9 is reduced; the hydraulic oil flows out from the port B of the stop valve I C4 after passing through the port B of the stop valve I C4, the hydraulic oil flowing out from the port B of the stop valve I C4 flows into the rodless cavity of the double-acting single-rod servo hydraulic cylinder III 10 through the port A of the double-acting single-rod servo hydraulic cylinder III 10, the piston rod of the double-acting single-rod servo hydraulic cylinder III 10 makes an extending motion, the hydraulic oil in the rod cavity of the double-acting single-rod servo hydraulic cylinder III 10 flows out through the port B thereof, the hydraulic oil flowing out from the port B of the double-acting single-rod servo hydraulic cylinder III 10 flows into the port B of the stop valve II C13 through the port A of the stop valve II C13, the hydraulic oil flowing out from the port B of the stop valve II C13 flows into the port B of the pressure sensor II C19 through the port A of the pressure sensor II C19, the hydraulic oil flows into the three-position four-way servo reversing valve III 16 through an opening A of the three-position four-way servo reversing valve III 16, the hydraulic oil directly flows into the oil tank 23 through an opening T of the three-position four-way servo reversing valve III 16 after passing through the three-position four-way servo reversing valve III 16, when the displacement sensor C7 detects that the stabilizing wheel 29 is close to the machined workpiece 31, the valve core of the three-position four-way servo reversing valve III 16 is switched to the right position, the high-pressure oil in the oil source 22 is communicated with the rod cavity of the double-acting single-rod servo hydraulic cylinder III 10, the pressure of the hydraulic oil in the rod cavity of the double-acting single-rod servo hydraulic cylinder III 10 is adjusted by adjusting the position of the valve core of the three-position four-way servo reversing valve III 16 according to the pressure signal of the pressure sensor II C19, and the extension speed of the piston rod of the double-acting single-rod servo hydraulic cylinder III 10 is reduced; and the displacement sensor I A5, the displacement sensor I B6 and the displacement sensor I C7 detect that the corresponding flexible stabilizing mechanisms move to the specified positions, and the position control of the active flexible stabilizing mechanism is completed.
The supporting force control function of the active flexible stabilizing mechanism is as follows: the three-position four-way servo reversing valve I14, the three-position four-way servo reversing valve II 15 and the three-position four-way servo reversing valve III 16 are positioned on the right, rod cavities of three double-acting single-rod servo hydraulic cylinders are all communicated with an oil source 22, when the supporting force needs to be increased, the valve opening pressure of a proportional overflow valve 20 is increased according to a pressure signal of a pressure sensor I1, the output pressure of hydraulic oil at a port B of the proportional speed control valve 21 is increased through the synergistic effect of the proportional speed control valve 21 and the proportional overflow valve 20, the valve core of the three-position four-way servo reversing valve I14 is adjusted to move leftwards according to a pressure signal of a pressure sensor II A17, the output pressure of the hydraulic oil at a port A of the three-position four-way servo reversing valve I14 is reduced, and the output force of a double-acting single-rod servo hydraulic cylinder I8 is increased; according to the pressure signal of the pressure sensor II B18, the valve core of the three-position four-way servo reversing valve II 15 is adjusted to move leftwards, the output pressure of the hydraulic oil of the port A of the three-position four-way servo reversing valve II 15 is reduced, and the output force of the double-acting single-rod servo hydraulic cylinder II 9 is increased; according to a pressure signal of a second pressure sensor C19, a valve core of a third three-position four-way servo reversing valve 16 is adjusted to move leftwards, the output pressure of hydraulic oil of an A port of the third three-position four-way servo reversing valve 16 is reduced, and the output force of a third double-acting single-rod servo hydraulic cylinder 10 is increased; when the supporting force needs to be reduced, the valve opening pressure of the proportional overflow valve 20 is reduced according to the pressure signal of the pressure sensor I1, the output pressure of the hydraulic oil at the port B of the proportional speed regulating valve 21 is reduced through the synergistic effect of the proportional speed regulating valve 21 and the proportional overflow valve 20, the output pressure of the hydraulic oil at the port A of the three-position four-way servo reversing valve I14 is improved by regulating the valve core of the three-position four-way servo reversing valve I14 to move rightwards according to the pressure signal of the pressure sensor II A17, and the output force of the double-acting single-rod servo hydraulic cylinder I8 is reduced; according to the pressure signal of the pressure sensor II B18, the valve core of the three-position four-way servo reversing valve II 15 is adjusted to move rightwards, the output pressure of the hydraulic oil of the port A of the three-position four-way servo reversing valve II 15 is improved, and the output force of the double-acting single-rod servo hydraulic cylinder II 9 is reduced; according to the pressure signal of the pressure sensor II C19, the valve core of the three-position four-way servo reversing valve III 16 is adjusted to move rightwards, so that the output pressure of the hydraulic oil of the port A of the three-position four-way servo reversing valve III 16 is improved, and the output force of the double-acting single-rod servo hydraulic cylinder III 16 is reduced; the independent adjusting function of the supporting force of the active flexible stabilizing mechanism is realized by adjusting the proportional overflow valve 20, the proportional speed regulating valve 21 and the servo reversing valve group.
The reset function of the active flexible stabilizing mechanism is as follows: the hydraulic system comprises a three-position four-way servo reversing valve I14, a three-position four-way servo reversing valve II 15 and a three-position four-way servo reversing valve III 16, wherein the three-position four-way servo reversing valve I16 and the three-position four-way servo reversing valve III 15 are positioned on the right, a proportional speed regulating valve 21 is regulated to enable the valve ports of the proportional speed regulating valve I14 to be in a closed state, the valve opening pressure of a proportional overflow valve 20 is reduced (adjusted to be zero), hydraulic oil in an oil source 22 flows into the three-position four-way servo reversing valve I14 through P ports of the three-position four-way servo reversing valve I14, flows into the three-position four-way servo reversing valve II 15 through P ports of the three-position four-way servo reversing valve II 16 through P ports of the three-position four-way servo reversing valve III 16, the hydraulic oil flows out through A ports of the three-position four-way servo reversing valve I14, the hydraulic oil flows out through A ports of the hydraulic cylinder I2, the hydraulic cylinder I2 and the hydraulic cylinder I2 of a double-action servo check valve I8; the hydraulic oil flows out from the port A of the three-position four-way servo reversing valve II 15 after passing through the port A of the pressure sensor II B18, the hydraulic oil flowing out from the port A of the three-position four-way servo reversing valve II 15 flows into the pressure sensor II B18 through the port A of the pressure sensor II B18, flows into the stop valve II B12 through the port B of the stop valve II B12, flows out from the port A of the stop valve II B12, flows into the rod cavity of the double-acting single-rod servo hydraulic cylinder II 9 through the port B of the double-acting single-rod servo hydraulic cylinder II 9, the hydraulic oil in the rodless cavity of the double-acting single-rod servo hydraulic cylinder II 9 flows out through the port A, the hydraulic oil flowing out from the port A of the double-acting single-rod servo hydraulic cylinder II 9 flows into the stop valve I B3 through the port B of the stop valve I B3, and flows out from the port A of the stop valve I B3; hydraulic oil flows out from an opening A of the three-position four-way servo reversing valve III 16 after passing through the three-position four-way servo reversing valve III 16, the hydraulic oil flowing out from the opening A of the three-position four-way servo reversing valve III 16 flows into a pressure sensor II C19 through an opening A of a pressure sensor II C19 respectively, flows into a stop valve II C13 through an opening B of a stop valve II C13, flows out from the opening A of the stop valve II C13 after passing through the opening A of the stop valve II C13, flows into a rod cavity of a double-acting single-rod servo hydraulic cylinder III 10 through an opening B of a double-acting single-rod servo hydraulic cylinder III 10, the hydraulic oil in a rodless cavity of the double-acting single-rod servo hydraulic cylinder III 10 flows out through the opening A thereof, flows out from the opening A of the double-acting single-rod servo hydraulic cylinder III 10 into a first stop valve C4 through an opening B of a stop valve I C4, and flows out from the opening A of the hydraulic oil after passing through a stop valve I C4; hydraulic oil flowing out of the port A of the first stop valve A2, the port A of the first stop valve B3 and the port A of the first stop valve C4 respectively flows into the pressure sensor I1 through the port A of the pressure sensor I1 and flows into the proportional overflow valve 20 through the port A of the proportional overflow valve 20, and the hydraulic oil directly flows back to the oil tank 23 through the port B of the proportional overflow valve 20; when the displacement sensor detects that the piston rod of the double-acting single-rod servo hydraulic cylinder moves to the initial position, the valve opening pressure of the proportional overflow valve 20 is adjusted to adjust the pressure difference between the hydraulic oil of the rodless cavity and the hydraulic oil of the rod cavity of the double-acting single-rod servo hydraulic cylinder, and the reset speed of the active flexible stabilizing mechanism is reduced.
Motion analysis of the active flexible stabilization mechanism: the machining workpiece 31 is driven by a spindle box of a machine tool to rotate at a constant speed, the driving flexible stabilizing mechanism starts to move under the driving of a double-acting single-rod servo hydraulic cylinder, a piston rod of the double-acting single-rod servo hydraulic cylinder moves to drive the connecting arm 25 to move through a ball hinge, the connecting arm 25 and the upper and lower connecting bases form a parallel four-bar mechanism, the lower connecting base 28 is continuously close to the machining workpiece 31 under the action of the connecting arm 25, the stabilizing wheel 29 is installed at one end, close to the machining workpiece 31, of the lower connecting base 28 through bolt connection, the stabilizing wheel 29 translates along with the lower connecting base 28, when the stabilizing wheel 29 is detected to move to be close to the workpiece 31, the moving speed of the driving flexible stabilizing mechanism is reduced by adjusting the state of a valve group in a hydraulic system, the stabilizing wheel 29 slowly approaches to the machining workpiece 31, after the stabilizing wheel 29 is contacted with the machining workpiece 31, the stabilizing wheel buffer layer 295 rotates along with the workpiece, the stabilizing wheel spoke 294 moves along with the stabilizing wheel buffer layer 295, the stabilizing wheel spoke 294 drives the stabilizing wheel central shaft 293 to rotate through key connection, two ends of the central shaft 293 of the stabilizing wheel are provided with sliding bearings, and the central shaft 293 of the stabilizing wheel is moved inside the sliding bearings; the turning tool starts to cut the machined workpiece 31, and the hydraulic system independently adjusts the supporting force of each stabilizing mechanism according to the stress state of the machined workpiece 31 to ensure the rigidity of the workpiece in the machining process; the vibration displacement generated by the workpiece in the processing process is transmitted to the lower connecting base 28 through the stabilizing wheel buffer layer 295, the lower connecting base 28 further transmits the vibration to the piston rod of the servo hydraulic cylinder, and the servo hydraulic cylinder has better damping characteristic and can provide a damping force for the flexible stabilizing mechanism, so that the vibration of the workpiece can be effectively inhibited, and the stability of the flexible stabilizing mechanism is ensured; when the lathe tool finishes the processing operation of the processing workpiece 31, the active flexible stabilizing mechanism is quickly reset under the action of the piston rod of the double-acting single-rod servo hydraulic cylinder, the connecting base 28 is quickly away from the processing workpiece 31 under the drive of the piston rod of the double-acting single-rod servo hydraulic cylinder, and the stabilizing wheel 29 is separated from the processing workpiece 31; when the displacement sensor detects that the piston of the double-acting single-rod servo hydraulic cylinder is close to the initial position, the movement speed of the piston rod of the double-acting single-rod servo hydraulic cylinder is reduced by adjusting the state of a valve group in a hydraulic system, and when the active flexible stabilizing mechanism reaches the initial position, the hydraulic system is adjusted to enable the piston rod of the double-acting single-rod servo hydraulic cylinder to be in a static state, so that all motion analysis of the active flexible stabilizing mechanism in the machining process is completed.
Force transfer analysis of the active flexible stabilization mechanism: before a turning tool turns a machined workpiece 31, an active flexible stabilizing mechanism moves from an initial position to a working position, a piston rod of a double-acting single-rod servo hydraulic cylinder begins to extend out under the action of hydraulic oil in a rodless cavity of the piston rod, the piston rod of the double-acting single-rod servo hydraulic cylinder outputs a supporting force, the supporting force output by the piston rod of the double-acting single-rod servo hydraulic cylinder is transmitted to a connecting arm 25 through a ball hinge connected with the connecting arm, the connecting arm 25 is connected with a lower connecting base 28 through a pin shaft, the connecting arm 25 transmits the force to the lower connecting base 28 through the contact action of the pin shaft, the lower connecting base 28 drives a stabilizing wheel 29 to move together, when the stabilizing wheel 29 is in contact with the machined workpiece 31, the stabilizing wheel 29 applies a supporting force F1 of one workpiece 31, the other two active flexible stabilizing mechanisms respectively apply a supporting force F2 and a supporting force F3 for ensuring the stability of the machined workpiece 31, when the three active flexible stabilizing mechanisms are in contact with the machined workpiece 31 (maintain a stable initial force), the workpiece 31 begins to be machined, and the machined workpiece 31 is controlled according to the machining state of the stable supporting force F1 and the machining valve group of the machined workpiece 31; in the process of turning the workpiece 31 by the turning tool, the machined workpiece 31 can generate machining vibration, the servo hydraulic cylinder has good damping characteristics, the servo hydraulic cylinder can effectively inhibit the machining vibration of the machined workpiece 31, in the process of the vibration of the machined workpiece 31, the servo hydraulic cylinder group outputs a damping force, the damping force is transmitted to the stabilizing wheel 29 through the lower connecting base 28, the damping force is transmitted to the stabilizing wheel spoke 294 through the stabilizing wheel side supporting arm 292, the damping force transmitted to the stabilizing wheel spoke 294 is transmitted to the machined workpiece 31 through the stabilizing wheel buffer layer 295, the damping force transmitted to the machined workpiece 31 is used for inhibiting the vibration caused by machining, and the stabilizing wheel buffer layer 295 is made of nylon materials, can further absorb the vibration and plays a role in protecting the workpiece; when the turning tool finishes turning the machined workpiece 31, the active flexible stabilizing mechanism needs to return to the initial position, the piston rod of the double-acting single-rod servo hydraulic cylinder begins to retract under the action of hydraulic oil in the rod cavity, the piston rod of the double-acting single-rod servo hydraulic cylinder outputs a pulling force, the pulling force output by the piston rod of the double-acting single-rod servo hydraulic cylinder is transmitted to the connecting arm 25 through the ball hinge connected with the connecting arm, the connecting arm 25 transmits the force to the lower connecting base 28 through the connecting pin shaft, the lower connecting base 28 begins to be far away from the machined workpiece 31, the stabilizing wheel 29 moves together with the lower connecting base 28, the stabilizing wheel 29 is separated from the machined workpiece 31, when the displacement sensor detects that the piston rod of the double-acting single-rod servo hydraulic cylinder returns to the initial position, the state of the hydraulic system valve group is adjusted to stop the piston rod of the double-acting single-rod servo hydraulic cylinder, and the analysis of the force transmission process of the active flexible stabilizing mechanism is completed.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a slender axles lathe work is with flexible stable system of initiative which characterized in that, is including installing the steady frame in the lathe frame, be equipped with a plurality of bosss in the steady frame, be equipped with connection base on the boss, it is connected with the one end of linking arm to go up connection base, the other end and the lower connection base of linking arm are connected, connection base is connected with the stabilizer wheel down, every go up all be equipped with two effects on the connection base and singly go out pole servo hydraulic cylinder, two effects are singly gone out pole servo hydraulic cylinder's piston rod and are passed through the earrings and are connected with the linking arm, the stabilizer wheel is used for stably processing the work piece.
2. The active flexible stabilizing system for turning of elongated rods of claim 1, wherein the stabilizer wheel comprises a stabilizer wheel side supporting arm, a stabilizer wheel base, a stabilizer wheel central shaft, a stabilizer wheel spoke and a stabilizer wheel buffer layer, the stabilizer wheel side supporting arm is fixedly connected with the stabilizer wheel base, one end of the stabilizer wheel side supporting arm far away from the stabilizer wheel base is provided with a circular mounting hole, the stabilizer wheel central shaft is mounted in the circular hole of the stabilizer wheel side supporting arm through a sliding bearing, and the stabilizer wheel spoke is mounted on the stabilizer wheel central shaft through a key connection; the outer edge of the wheel spoke of the stabilizing wheel is provided with a stabilizing wheel buffer layer, and the lower connecting base is fixedly connected with the stabilizing wheel base through a bolt.
3. The active flexible stabilizing system for turning of long and thin rods of claim 1, wherein four connecting arms are arranged between the upper connecting base and the lower connecting base, the four connecting arms, the upper connecting base and the lower connecting base form a parallel four-bar mechanism, a connecting lug ring at one end of a rodless cavity of the double-acting single-rod servo hydraulic cylinder is provided with a ball hinge, the ball hinge is connected with the upper connecting base through a connecting pin shaft, a connecting lug ring on a piston rod of the double-acting single-rod servo hydraulic cylinder is provided with a ball hinge, and the ball hinge is connected with the lower ends of the connecting arms through the connecting pin shaft.
4. The active flexible stabilization system for turning of long and thin rods of claim 2 is characterized in that a rodless cavity of each double-acting single-rod servo hydraulic cylinder is respectively connected with a proportional speed control valve, a proportional overflow valve and a pressure sensor through a first stop valve, a rod cavity of each double-acting single-rod servo hydraulic cylinder is connected with a second stop valve, a displacement sensor is arranged in each double-acting single-rod servo hydraulic cylinder, the second stop valve is connected with a second pressure sensor and an A port of a servo reversing valve, a P port of the servo reversing valve is connected with an oil source, a T port of the servo reversing valve is connected with an oil tank, a B port of the servo reversing valve is in a cut-off state, the proportional speed control valve is connected with the oil source, and the proportional overflow valve is connected with the oil tank.
5. The active flexible stabilization system for elongated rod turning of claim 4 wherein the position of the active flexible stabilization mechanism is controlled as follows:
the servo reversing valve is in a left position, high-pressure oil in an oil source flows out from a port B of the proportional speed regulating valve after being regulated by the proportional speed regulating valve, when the pressure of the hydraulic oil flowing out from the port B of the proportional speed regulating valve is lower than the preset valve opening pressure of the proportional overflow valve, the hydraulic oil flowing out from the port B of the proportional speed regulating valve flows into a first pressure sensor and a first stop valve respectively, the hydraulic oil flows into a rodless cavity of the double-acting single-rod servo hydraulic cylinder through the first stop valve, a piston of the double-acting single-rod servo hydraulic cylinder does extension movement, the hydraulic oil flows into a second stop valve through the port B of the second stop valve, the hydraulic oil flows into a second pressure sensor and the servo reversing valve, the hydraulic oil directly flows into an oil tank through a port T of the servo reversing valve, when the displacement sensor detects that an active flexible stabilizing mechanism approaches a processing workpiece, a valve core of the servo reversing valve is switched to a right position, the high-pressure oil in the oil source is communicated with a rod cavity of the double-acting single-rod servo hydraulic cylinder, and the extension speed of the piston of the servo hydraulic cylinder is reduced by increasing the pressure in the rod cavity of the servo hydraulic cylinder; when the displacement sensor detects that the active flexible stabilizing mechanism moves to a designated position, the servo reversing valve is switched to a middle position, and the double-acting single-rod servo hydraulic cylinder is in a locking state, so that the position control function of the active flexible stabilizing mechanism is realized.
6. The active flexible stabilization system for elongated rod turning of claim 4 wherein the control of the support force of the active flexible stabilization mechanism is as follows:
the servo reversing valve is positioned on the right, a rod cavity of the double-acting single-rod servo hydraulic cylinder is communicated with an oil source, when the supporting force needs to be increased, the valve opening pressure of the proportional overflow valve is increased according to a pressure signal of the pressure sensor I, the output pressure of the hydraulic oil at the port B of the proportional speed control valve is increased through the synergistic effect of the proportional speed control valve and the proportional overflow valve, the output pressure of the hydraulic oil at the port A of the reversing valve is reduced by controlling the valve core position of the servo reversing valve according to a pressure signal of the pressure sensor II, and the control of the output force of the double-acting single-rod servo hydraulic cylinder is realized by adjusting the pressure of the hydraulic oil in the rodless cavity and the rod cavity of the double-acting single-rod servo hydraulic cylinder.
7. The active flexible stabilization system for elongated rod turning of claim 4 wherein the active flexible stabilization mechanism is reset as follows:
the servo reversing valve is positioned at the right position, the proportional speed regulating valve is regulated to enable the valve port of the proportional speed regulating valve to be in a closed state, the valve opening pressure of the proportional overflow valve is reduced, hydraulic oil in an oil source flows into the servo reversing valve through the P port of the servo reversing valve, the hydraulic oil flows out from the A port of the servo reversing valve, the hydraulic oil flowing out from the A port of the servo reversing valve respectively flows into the pressure sensor II and the stop valve II, the hydraulic oil flows into the rod cavity of the double-acting single-rod servo hydraulic cylinder through the stop valve II, the piston of the double-acting single-rod servo hydraulic cylinder does retraction movement, the hydraulic oil in the rodless cavity of the double-acting single-rod servo hydraulic cylinder flows into the pressure sensor I and the proportional overflow valve respectively through the A port of the stop valve I, the hydraulic oil directly flows back into the oil tank through the B port of the hydraulic cylinder after passing through the proportional overflow valve I, when the displacement sensor detects that the piston of the double-acting single-rod servo hydraulic cylinder is close to the initial position, the valve opening pressure of the proportional overflow valve is regulated, the reset speed of the active flexible stabilizing mechanism is reduced, when the displacement sensor detects that the piston of the single-acting single-rod servo hydraulic cylinder moves to the initial position, the middle position is switched, the servo reversing valve is switched, and the open the active flexible overflow valve is stabilized.
8. The active flexible stabilization system for turning of elongated rods of claim 4, wherein the motion process of the active flexible stabilization mechanism is as follows:
the machining workpiece rotates at a constant speed under the drive of a spindle box of a machine tool, the active flexible stabilizing mechanism starts to move under the drive of the double-acting single-rod servo hydraulic cylinder, a piston rod of the double-acting single-rod servo hydraulic cylinder transmits the motion to a connecting arm through a spherical hinge, a lower connecting base is continuously close to the machining workpiece under the action of the connecting arm, the stabilizing wheel translates along with the lower connecting base, when the detecting stabilizing wheel moves to the position close to the workpiece, the motion speed of the active flexible stabilizing mechanism is reduced by adjusting the state of a servo reversing valve, so that the stabilizing wheel slowly approaches to the machining workpiece, after the stabilizing wheel contacts with the workpiece, the stabilizing wheel buffer layer rotates along with the workpiece, the stabilizing wheel spokes move along with the stabilizing wheel buffer layer, the stabilizing wheel spokes drive the stabilizing wheel central shaft to rotate through key connection, sliding bearings are arranged at two ends of the stabilizing wheel central shaft, the stabilizing wheel central shaft moves in the sliding bearings, a turning tool starts to cut the workpiece, and the hydraulic system independently adjusts the supporting force of each active flexible stabilizing mechanism according to the stress state of the machining workpiece, so as to ensure the rigidity of the workpiece in the machining process; the vibration displacement generated by the workpiece in the machining process is transmitted to the lower connecting base through the stabilizing wheel buffer layer, the lower connecting base further transmits the vibration to a piston rod of the servo hydraulic cylinder, the double-acting single-rod servo hydraulic cylinder provides a damping force for the flexible stabilizing mechanism, and the flexible stabilizing mechanism can effectively inhibit the vibration of the workpiece and ensure the stability of the flexible stabilizing mechanism; when the lathe tool finishes the processing operation on the workpiece, the active flexible stabilizing mechanism is quickly reset under the action of the piston rod of the double-acting single-rod servo hydraulic cylinder, the piston rod of the double-acting single-rod servo hydraulic cylinder drives the lower connecting base to be quickly away from the processed workpiece, and the stabilizing wheel is separated from the processed workpiece; when the displacement sensor detects that the piston of the double-acting single-rod servo hydraulic cylinder is close to the initial position, the movement speed of the piston rod of the double-acting single-rod servo hydraulic cylinder is reduced by adjusting the state of the servo reversing valve, and when the active flexible stabilizing mechanism reaches the initial position, the piston rod of the double-acting single-rod servo hydraulic cylinder is in a static state through a hydraulic valve group in the adjusting system, so that the whole movement process of the active flexible stabilizing mechanism in the workpiece machining process is completed.
9. The active flexible stabilizing system for elongated rod turning of claim 4 wherein the force transfer process of the active flexible stabilizing mechanism is as follows:
before a turning tool turns a workpiece, an active flexible stabilizing mechanism moves to a working position from an initial position, a piston rod of a double-acting single-rod servo hydraulic cylinder starts to extend out under the action of hydraulic oil in a rodless cavity of the double-acting single-rod servo hydraulic cylinder, a supporting force is output by the piston rod of the double-acting single-rod servo hydraulic cylinder and is transmitted to a connecting arm through a spherical hinge, a lower connecting base continuously approaches to the workpiece to be machined under the action of the connecting arm, the lower connecting base drives a stabilizing wheel to move together, when the stabilizing wheel is in contact with the workpiece to be machined, the stabilizing wheel applies a supporting force to the workpiece, when all the active flexible stabilizing mechanisms are in contact with the workpiece, the turning tool starts to turn the workpiece, at the moment, the workpiece is subjected to the turning force of the turning tool and the stable supporting forces of the three active flexible stabilizing mechanisms simultaneously, the state of a servo reversing valve is adjusted according to the moving state and the stress state of the workpiece, the independent control of the stable supporting forces in all directions is realized, and the machining stability of the workpiece is ensured; in the process of turning a workpiece by a turning tool, the workpiece can generate machining vibration, the double-acting single-rod servo hydraulic cylinder has a good damping characteristic and can effectively inhibit the machining vibration of the workpiece, in the process of the workpiece vibration, the double-acting single-rod servo hydraulic cylinder outputs a damping force, the damping force is transmitted to the stabilizing wheel through the lower connecting base, the damping force is transmitted to the stabilizing wheel spoke through the stabilizing wheel side supporting arm, the damping force transmitted to the stabilizing wheel spoke is transmitted to the workpiece through the stabilizing wheel buffer layer, the damping force transmitted to the workpiece is used for inhibiting the vibration of the workpiece caused by machining, and the stabilizing wheel buffer layer is made of nylon materials and can further absorb the vibration and play a role in protecting the workpiece; when a turning tool finishes turning a workpiece, the active flexible stabilizing mechanism is required to return to an initial position, a piston rod of the double-acting single-rod servo hydraulic cylinder starts to retract under the action of hydraulic oil in a rod cavity of the double-acting single-rod servo hydraulic cylinder, the piston rod of the double-acting single-rod servo hydraulic cylinder outputs a pulling force, the pulling force output by the piston rod of the double-acting single-rod servo hydraulic cylinder is transmitted to a connecting arm through a spherical hinge connected with the connecting arm, the connecting arm transmits the force to a lower connecting base through a connecting pin shaft, the lower connecting base starts to be away from the workpiece to be machined, a stabilizing wheel moves along with the lower connecting base and is separated from the workpiece, when a displacement sensor detects that the piston rod of the double-acting single-rod servo hydraulic cylinder returns to the initial position, the state of a valve group in a hydraulic system is adjusted to stop the piston rod of the double-acting single-rod servo hydraulic cylinder, and the force transmission process analysis of the active flexible stabilizing mechanism is finished.
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| CN202210903075.5A CN115370627B (en) | 2022-07-29 | 2022-07-29 | Active flexible stabilizing system for turning slender rod |
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| CN202210903075.5A CN115370627B (en) | 2022-07-29 | 2022-07-29 | Active flexible stabilizing system for turning slender rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4041539A1 (en) * | 1990-12-22 | 1992-07-02 | Saarstahl Ag | Rod and tube surface working - has relative movement between workpiece and tool head |
| EP0644007A1 (en) * | 1993-09-22 | 1995-03-22 | NORD PRODUCTIQUE société anonyme | Process and device for measuring railway wheels before reprofiling |
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| EP2829339A1 (en) * | 2013-07-17 | 2015-01-28 | TRUMPF Werkzeugmaschinen GmbH + Co. KG | Positioning device for positioning workpieces, machine tool with such a positioning device, method for positioning workpieces |
| CN204997080U (en) * | 2015-09-08 | 2016-01-27 | 汕头市精工东捷制版有限公司 | Lathe |
| CN205852297U (en) * | 2016-08-17 | 2017-01-04 | 安徽合力股份有限公司合肥铸锻厂 | A kind of numer centre frame |
| CN206474689U (en) * | 2017-01-12 | 2017-09-08 | 天津市锦程伟业人防设备有限公司 | Numerical control self-centering center frame |
| KR101963091B1 (en) * | 2018-12-14 | 2019-03-27 | 진영명 | A hydraulic steady rest for lathe |
| CN211028116U (en) * | 2019-10-29 | 2020-07-17 | 泸州楠鑫玻璃模具有限公司 | Lathe convenient to major axis processing |
| CN211965949U (en) * | 2020-04-02 | 2020-11-20 | 嘉兴市文良金属制品有限公司 | Stabilizing device of numerical control lathe |
| CN217045429U (en) * | 2022-03-01 | 2022-07-26 | 浙江微控智造有限公司 | Slender axle lathe processing follow rest |
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2022
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| DE4041539A1 (en) * | 1990-12-22 | 1992-07-02 | Saarstahl Ag | Rod and tube surface working - has relative movement between workpiece and tool head |
| EP0644007A1 (en) * | 1993-09-22 | 1995-03-22 | NORD PRODUCTIQUE société anonyme | Process and device for measuring railway wheels before reprofiling |
| JP2003266268A (en) * | 2002-03-13 | 2003-09-24 | Okuma Corp | Workpiece chattering preventing device |
| EP2829339A1 (en) * | 2013-07-17 | 2015-01-28 | TRUMPF Werkzeugmaschinen GmbH + Co. KG | Positioning device for positioning workpieces, machine tool with such a positioning device, method for positioning workpieces |
| CN204997080U (en) * | 2015-09-08 | 2016-01-27 | 汕头市精工东捷制版有限公司 | Lathe |
| CN205852297U (en) * | 2016-08-17 | 2017-01-04 | 安徽合力股份有限公司合肥铸锻厂 | A kind of numer centre frame |
| CN206474689U (en) * | 2017-01-12 | 2017-09-08 | 天津市锦程伟业人防设备有限公司 | Numerical control self-centering center frame |
| KR101963091B1 (en) * | 2018-12-14 | 2019-03-27 | 진영명 | A hydraulic steady rest for lathe |
| CN211028116U (en) * | 2019-10-29 | 2020-07-17 | 泸州楠鑫玻璃模具有限公司 | Lathe convenient to major axis processing |
| CN211965949U (en) * | 2020-04-02 | 2020-11-20 | 嘉兴市文良金属制品有限公司 | Stabilizing device of numerical control lathe |
| CN217045429U (en) * | 2022-03-01 | 2022-07-26 | 浙江微控智造有限公司 | Slender axle lathe processing follow rest |
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| CN115370627B (en) | 2024-04-19 |
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