CN105415744A - Force output device with high resolution - Google Patents
Force output device with high resolution Download PDFInfo
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- CN105415744A CN105415744A CN201510993562.5A CN201510993562A CN105415744A CN 105415744 A CN105415744 A CN 105415744A CN 201510993562 A CN201510993562 A CN 201510993562A CN 105415744 A CN105415744 A CN 105415744A
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- elastic conductive
- unit
- conductive unit
- ball
- power output
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/165—Control arrangements for fluid-driven presses for pneumatically-hydraulically driven presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/166—Electrical control arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
Abstract
The invention provides a force output device with high resolution, comprising a force output unit, a force applying head, an elastic conducting unit, a position detection unit and a control unit, wherein the force output unit can output pressure or tensile force; the force applying head (7) can correspondingly act pressure or tensile force output by the force output unit to a workpiece (1); the elastic conducting unit can correspondingly transfer the pressure or tensile force output by the force output unit to the force applying head (7) via self deformation; the position detection unit can detect the positions of two ends of the elastic conducting unit before and after deformation and calculate the deformation of the elastic conducting unit; and the control unit can calculate the force applied by the force applying head (7) to the workpiece (1) according to the deformation of the elastic conducting unit. The force output device with high resolution can carry out precise control on static forming force, and can reach the control precision of the level of more than 0.01%, so as to ensure the forming quality and the appearance precision of parts; and the force output device also has the advantages of being simple in structure and low in cost.
Description
Technical field
The present invention relates to numerical control machine tool technique field, specifically a kind of high-resolution power output device.
Background technology
In metal forming equipment, the control accuracy of plastic force is a key technical indexes.When using hydraulic jack to drive, the pressure of general adoption rate valve hydraulic control system, to control the size of oil cylinder power output.Use driven by servomotor, being the output torque by controlling servomotor, realizing the control to power output.
The hydraulic system of adoption rate pressure valve mode hydraulic control cylinder power output, affects the principal element of power output precision:
1. proportional pressure valve control accuracy.The precision of valve is generally 3% of full scale, and high accuracy can reach 0.5%;
2. the final output valve of the impact of cylinder seal frictional force.
The control accuracy of the power output of general oil cylinder is 5% ~ 1%, is difficult to reach higher precision.
Adopt servomotor Torque Control, the general force snesor that adopts feeds back, to improve control accuracy.Affect the main cause of power output precision:
1. the scan frequency of high-precision force sensor is 3Hz, is not suitable as the feedback element of control system, restriction control accuracy.
2. the final output valve of the friction effects of guide rail and leading screw.
In prior art, precision reach more than 0.01% force snesor cost all higher, and need higher environmental condition, be generally used for laboratory, be not suitable for industry spot and use.
Summary of the invention
In order to the problem that the precision overcoming power output in existing machinery process equipment is lower, the invention provides a kind of high-resolution power output device, this high-resolution power output device can control more accurately to static plastic force, reach the above control accuracy (resolution ratio) of 0.01% rank, to ensure the form accuracy of forming quality and part.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of high-resolution power output device, comprising:
Power output unit, can output pressure or pulling force;
Force head, the pressure that can be exported by this power output unit accordingly or pulling force act on workpiece;
Elastic conductive unit, the pressure that can be exported by this power output unit accordingly by self-deformation or pull transfer are to force head, and one end of this elastic conductive unit is connected with this power output unit, and the other end of this elastic conductive unit is connected with force head;
Position detection unit, the two ends that can detect this elastic conductive unit before being deformed after position and calculate the deflection of this elastic conductive unit;
Control unit, acts on power on workpiece according to the Deformation calculation of this elastic conductive unit head that goes out to exert a force.
The invention has the beneficial effects as follows:
1, utilize flexible member, the control of power is converted into position control.
2, by the position control system of mature and reliable, under industry spot condition, realize controlling the high accuracy of static power output.
3, structure is simple, and cost is low, and this high-resolution power output device is only 1/10th of equal accuracy product (precision reach more than 0.01%).
4, the resolution ratio (more than 0.01%) of power output, control accuracy can reach the accuracy of detection (0.04% industry spot level) of force snesor.
5, be provided with correcting mechanism, utilize the volume deviation that high-precision force sensor correction flexible member Long-Time Service produces.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.
Fig. 1 is the schematic diagram of high-resolution power output device.
Fig. 2 is the concrete enforcement schematic diagram of high-resolution power output device.
Fig. 3 is the enlarged diagram at butterfly spring group position in Fig. 2.
Reference numeral in figure: 1, workpiece; 2, the first displacement transducer; 3, high-precision force sensor; 4, second displacement sensor; 5, ball-screw bearing; 6, motor cabinet; 7, exert a force head; 8, butterfly spring group; 9, nut seat guide rail; 10, butterfly spring group guard shield; 11, ball-screw; 12, ball-screw nut seat; 13, shaft coupling; 14, reductor; 15, motor.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
A kind of high-resolution power output device, comprising:
Power output unit, can output pressure or pulling force;
Force 7, can act on workpiece 1 by the pressure of this power output unit output or pulling force accordingly;
Elastic conductive unit, the pressure that can be exported by this power output unit accordingly by self-deformation or pull transfer are to force 7, one end of this elastic conductive unit is connected with this power output unit, the other end of this elastic conductive unit and force 7 is connected, namely one end of this elastic conductive unit is to the direction of the other end of this elastic conductive unit, and this power output unit, elastic conductive unit and force 7 is connected successively;
Position detection unit, the two ends that can detect this elastic conductive unit before being deformed after position and go out the concrete numerical value of the deflection of this elastic conductive unit according to this position calculation;
Control unit, goes out the power suffered by this elastic conductive unit according to the deflection of this elastic conductive unit and effective elastic constants, thus 7 numerical value acting on the power on workpiece 1 that obtain exerting a force, as shown in Figure 1.
In the present embodiment, this elastic conductive unit is the elastomeric element meeting Hooke's law.Namely the pressure that is subject to of this elastic conductive unit or pulling force are directly proportional to the deflection of this elastic conductive unit, and this elastic conductive unit meets following formula:
F＝k×x
In this formula, F is the pressure that is subject to of this elastic conductive unit or pulling force, and unit is N; K is the coefficient of elasticity of this elastic conductive unit, and unit is N/m; X is the deflection of this elastic conductive unit, and unit is m.
In the present embodiment, when power output is less, this elastic conductive unit can be cylindrical spring.Or, when power output is larger, this elastic conductive unit is butterfly spring group 8, to increase bearing capacity, this butterfly spring group 8 comprises a butterfly spring string and butterfly spring group guard shield 10, this butterfly spring string is connected to form between two relatively by multiple butterfly spring, as shown in Figures 2 and 3, what butterfly spring group guard shield 10 mated is sheathed on outside this butterfly spring string, along the orientation of butterfly spring in this butterfly spring string, one end of this butterfly spring string is one end of this elastic conductive unit, and the other end of this butterfly spring string is the other end of this elastic conductive unit.Namely one end of this butterfly spring string can be connected with force 7, and the other end of this butterfly spring string is connected with this power output unit.
In the present embodiment, this power output unit comprises ball-screw 11 and motor 15, and motor 15 can drive described one end of this elastic conductive unit to move to the described other end of this elastic conductive unit by ball-screw 11.This power output unit also comprises shaft coupling 13, reductor 14 and ball-screw bearing 5, motor 15 is fixedly connected with shaft coupling 13 one end with the screw rod of ball-screw 11 by reductor 14 successively, the ball-screw nut seat 12 of ball-screw 11 abuts with described one end of this elastic conductive unit, the other end of the screw rod of ball-screw 11 is plugged in described one end of this elastic conductive unit, ball-screw bearing 5 is sheathed on outside the screw rod of ball-screw 11, ball-screw bearing 5 is between shaft coupling 13 and ball-screw nut seat 12, ball-screw bearing 5 is fixed on motor cabinet 6.
In the present embodiment, described high-resolution power output device also comprises nut seat guide rail 9, nut seat guide rail 9 points to the other end of this elastic conductive unit direction along one end of this elastic conductive unit is arranged, the ball-screw nut seat 12 of ball-screw 11 is connected with nut seat guide rail 9, slides in the direction that nut seat guide rail 9 can guide ball-screw nut seat 12 to point to the other end of this elastic conductive unit along one end of this elastic conductive unit.
In the present embodiment, this position detection unit comprises the first displacement transducer 2 and second displacement sensor 4.First displacement transducer 2 is connected with force 7, the first displacement transducer 2 can detect in real time exert a force 7 position and calculate the position of the other end of elastic conductive unit with this.Second displacement sensor 4 is connected with the ball-screw nut seat 12 of ball-screw 11, and second displacement sensor 4 can detect the position of ball-screw nut seat 12 in real time and calculate the position of one end of elastic conductive unit with this.Real-time for this deflection is also fed back to this control unit by the deflection of this elastic conductive unit of positional information calculation that this position detection unit can detect according to the first displacement transducer 2 and second displacement sensor 4.Motor 15, first displacement transducer 2 is all connected with this control unit with second displacement sensor 4.This control unit can also control the operation of this high-resolution power output device.
In the present embodiment, motor 15 is servomotor, motor 15 passes through reductor 14 to increase moment, be connected by the screw rod of shaft coupling 13 with ball-screw 11, ball-screw 11 is supported by the ball-screw bearing 5 be arranged on motor cabinet 6, motor 15 can control the position of ball-screw nut seat 12, and namely as depicted in figs. 1 and 2, motor 15 can drive ball-screw nut seat 12 to move up and down.Nut seat guide rail 9 pairs of ball-screw nut seats 12 play the guiding role.Force 7 and ball-screw nut seat 12 are respectively by respective displacement transducer (the first displacement transducer 2 and second displacement sensor 4) feedback position signal, and both differences are the deflection of groups of springs.By the butterfly spring group 8 of being assembled by butterfly spring group guard shield 10, transmit motion to force pressure head 7.When force pressure head is up withstand workpiece 1 after, driven by servomotor ball-screw nut seat 12 continuation is up, gradually reduce butterfly spring group 8, the power output of force 7 increases, the size of power output is directly proportional to the decrement of butterfly spring group 8, is indirectly controlled the size of force pressure head power output by the position controlling ball-screw nut seat 12.
The maximum of butterfly spring group 8 is carried as 200000N, coefficient of elasticity is 2000N/mm (being equivalent to 20N/0.01mm), the positioning precision 0.01mm of ball-screw nut seat 12, the resolution ratio (for 0.01% of maximum load) of corresponding 20N power output, control accuracy can reach 0.04%.
In use, when exert a force 7 do not contact be biased body (workpiece 1 as to be processed) time, this elastic conductive unit (as butterfly spring group 8) is indeformable, and force 7 is synchronized with the movement with ball-screw nut seat 12; Stop motion after force 7 contact are biased body, ball-screw nut seat 12 continues motion, force produces displacement difference between 7 and ball-screw nut seat 12, make this elastic conductive element deformation, the deflection of this elastic conductive unit equals a displacement difference produced between 7 and ball-screw nut seat 12 that exerts a force, the deflection of this elastic conductive unit is directly proportional to force 7 power exported, control the shift differences of force between 7 and ball-screw nut seat 12 like this, just can realize the control to power output.
When power output is less, motor 15 can Direct driver ball-screw 11, uses cylindrically coiled spring, can reduce costs.When cylindrically coiled spring two ends are fixedly attached to ball-screw nut seat 12 and force 7, the two-way output of pressure and pulling force can be realized.When power output is larger, driven by servomotor ball-screw 11 and motor 15 can be substituted by servo-cylinder (hydraulic cylinder) drive system.Namely only this servo-cylinder just can drive described one end of this elastic conductive unit to move to the described other end of this elastic conductive unit.
The control accuracy of high-resolution power output device is as shown in Figure 2 0.04% (the force snesor full accuracy grade can applied in industry spot at present).Force is connected by high-precision force sensor 3 between 7 and the other end of this elastic conductive unit, and high-precision force sensor 3 can detect that force 7 acts on the size of the power of workpiece 1.High-precision force sensor 3 is for verifying output valve, and in use for some time, the coefficient of elasticity revising butterfly spring group 8 changes the deviation caused.
The above, be only specific embodiments of the invention, can not limit the scope that invention implements with it, so the displacement of its equivalent assemblies, or the equivalent variations done according to scope of patent protection of the present invention and modification, all still should belong to the category that this patent is contained.In addition, the technical characteristic in the present invention and all can using by independent assortment between technical characteristic, between technical characteristic and technical scheme, between technical scheme and technical scheme.
Claims (10)
1. a high-resolution power output device, is characterized in that, described high-resolution power output device comprises:
Power output unit, can output pressure or pulling force;
Force head (7), the pressure that can be exported by this power output unit accordingly or pulling force act on workpiece (1);
Elastic conductive unit, the pressure that can be exported by this power output unit accordingly by self-deformation or pull transfer are to force head (7), one end of this elastic conductive unit is connected with this power output unit, and the other end of this elastic conductive unit is connected with force head (7);
Position detection unit, the two ends that can detect this elastic conductive unit before being deformed after position and calculate the deflection of this elastic conductive unit;
Control unit, acts on power on workpiece (1) according to the Deformation calculation of this elastic conductive unit head (7) that goes out to exert a force.
2. high-resolution power output device according to claim 1, it is characterized in that, connected by high-precision force sensor (3) between force head (7) and the other end of this elastic conductive unit, high-precision force sensor (3) can detect that force head (7) acts on the size of the power of workpiece (1).
3. high-resolution power output device according to claim 1, it is characterized in that, this elastic conductive unit is the elastomeric element meeting Hooke's law, and this control unit can act on power on workpiece (1) according to the following formulae discovery head (7) that goes out to exert a force;
F＝k×x
In this formula, F is the pressure that is subject to of this elastic conductive unit or pulling force, and unit is N; K is the coefficient of elasticity of this elastic conductive unit, and unit is N/m; X is the deflection of this elastic conductive unit, and unit is m; The pressure that this elastic conductive unit is subject to or the pulling force head (7) that equals to exert a force acts on power on workpiece (1).
4. high-resolution power output device according to claim 1, is characterized in that, this elastic conductive unit is cylindrical spring.
5. high-resolution power output device according to claim 1, it is characterized in that, this elastic conductive unit is butterfly spring group (8), butterfly spring group (8) comprises a butterfly spring string and butterfly spring group guard shield (10), this butterfly spring string is connected to form between two relatively by multiple butterfly spring, what butterfly spring group guard shield (10) mated is sheathed on outside this butterfly spring string, along the orientation of butterfly spring in this butterfly spring string, one end of this butterfly spring string is one end of this elastic conductive unit, the other end of this butterfly spring string is the other end of this elastic conductive unit.
6. high-resolution power output device according to claim 1, it is characterized in that, this power output unit comprises ball-screw (11) and motor (15), and motor (15) can pass through ball-screw (11) and drive described one end of this elastic conductive unit to move to the described other end of this elastic conductive unit.
7. high-resolution power output device according to claim 6, it is characterized in that, this power output unit also comprises shaft coupling (13), reductor (14) and ball-screw bearing (5), motor (15) is fixedly connected with shaft coupling (13) one end with the screw rod of ball-screw (11) by reductor (14) successively, the ball-screw nut seat (12) of ball-screw (11) abuts with described one end of this elastic conductive unit, the other end of the screw rod of ball-screw (11) is plugged in described one end of this elastic conductive unit, ball-screw bearing (5) is sheathed on outside the screw rod of ball-screw (11), ball-screw bearing (5) is positioned between shaft coupling (13) and ball-screw nut seat (12), ball-screw bearing (5) is fixed on motor cabinet (6).
8. high-resolution power output device according to claim 6, it is characterized in that, described high-resolution power output device also comprises nut seat guide rail (9), nut seat guide rail (9) points to the other end of this elastic conductive unit direction along one end of this elastic conductive unit is arranged, the ball-screw nut seat (12) of ball-screw (11) is connected with nut seat guide rail (9), slide in the direction that nut seat guide rail (9) can guide ball-screw nut seat (12) to point to the other end of this elastic conductive unit along one end of this elastic conductive unit.
9. high-resolution power output device according to claim 6, it is characterized in that, this position detection unit comprises:
First displacement transducer (2), is connected with force head (7), can detect the position of force head (7) in real time;
Second displacement sensor (4), is connected with the ball-screw nut seat (12) of ball-screw (11), can detects the position of ball-screw nut seat (12) in real time.
10. high-resolution power output device according to claim 1, is characterized in that, this power output unit comprises hydraulic cylinder, and this hydraulic cylinder can drive described one end of this elastic conductive unit to move to the described other end of this elastic conductive unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510993562.5A CN105415744B (en) | 2015-12-25 | 2015-12-25 | A kind of high-resolution power output device |
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| CN201510993562.5A CN105415744B (en) | 2015-12-25 | 2015-12-25 | A kind of high-resolution power output device |
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| CN105415744A true CN105415744A (en) | 2016-03-23 |
| CN105415744B CN105415744B (en) | 2017-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342402A (en) * | 2018-12-12 | 2019-02-15 | 上海大学 | A kind of ceramic material method for measuring stress based on Raman spectrum |
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| CN105081717A (en) * | 2015-09-16 | 2015-11-25 | 佛山市新恒萃材料科技有限公司 | Buffer type contact force active control multi-purpose operation equipment |
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|---|---|---|---|---|
| US5020496A (en) * | 1989-10-18 | 1991-06-04 | Robert Bosch Gmbh | Apparatus having a control motor for intervention into a force transmission device |
| CN2876750Y (en) * | 2006-03-17 | 2007-03-07 | 燕山大学 | Mechanical servo-loader |
| CN200960739Y (en) * | 2006-10-12 | 2007-10-17 | 上海沪工汽车电器有限公司 | Stroke pressure controller |
| JP2013031877A (en) * | 2011-07-04 | 2013-02-14 | Unitec Industry Co Ltd | Pressurizing device and molding apparatus with the same |
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| CN109342402A (en) * | 2018-12-12 | 2019-02-15 | 上海大学 | A kind of ceramic material method for measuring stress based on Raman spectrum |
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Address after: 100024 North East military villa, eight Li bridge, Chaoyang District, Beijing Patentee after: China Institute of Aeronautical Manufacturing Technology Address before: 100024 North East military villa, eight Li bridge, Chaoyang District, Beijing Patentee before: Beijing Aviation Manufacturing Engineering Institute of China Aviation Industry Group Company |