CN105666034A - Ultrasonic reinforcement online monitoring adjustment method and device as well as ultrasonic reinforcement device - Google Patents
Ultrasonic reinforcement online monitoring adjustment method and device as well as ultrasonic reinforcement device Download PDFInfo
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- CN105666034A CN105666034A CN201610267944.4A CN201610267944A CN105666034A CN 105666034 A CN105666034 A CN 105666034A CN 201610267944 A CN201610267944 A CN 201610267944A CN 105666034 A CN105666034 A CN 105666034A
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- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000012544 monitoring process Methods 0.000 title claims abstract description 34
- 230000002787 reinforcement Effects 0.000 title abstract 5
- 238000012545 processing Methods 0.000 claims abstract description 41
- 230000008569 process Effects 0.000 claims abstract description 30
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 238000002604 ultrasonography Methods 0.000 claims description 57
- 230000000052 comparative effect Effects 0.000 claims description 16
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
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- 230000000694 effects Effects 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
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- 238000004519 manufacturing process Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005480 shot peening Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
- B23P9/02—Treating or finishing by applying pressure, e.g. knurling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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Abstract
The invention provides an ultrasonic reinforcement online monitoring adjustment method and device as well as an ultrasonic reinforcement device. The method comprises the steps of measuring a voltage and a current at two ends of an ultrasonic transducer in a working process in real time, and performing calculation according to the voltage and the current to obtain instantaneous load impedance in the working process; comparing the instantaneous load impedance with a pre-stored standard load impedance threshold, and obtaining an output control signal according to a comparison result; and according to the output control signal, controlling and adjusting the size of a processing gap between the ball end of an ultrasonic tool and a reinforced workpiece. According to embodiments of the invention, the defects of low adjusting efficiency, incapability of realizing fine control and poor reinforcement treatment effect in the prior art of adjusting the size of a processing gap between the ball end of an ultrasonic tool and a reinforced workpiece by virtue of experience of operators or by arranging a ruler are overcome.
Description
Technical field
The present invention relates to component of machine surface strengthening technology field, in particular to a kind of ultrasound-enhanced on-line monitoring control method, device and ultrasound-enhanced device.
Background technology
At present, corrosion, wear, fracture are to cause that component of machine damages the common Three models lost efficacy, and the disaster wherein brought with fracture failure is maximum with loss; Some important spare parts in the machineries such as automobile, locomotive, aircraft, steam turbine, repeat load is born such as spring, axle, gear, connecting rod, blade, wheel etc., sometimes there is fracture failure, and fatigue fracture proportion is the highest in fracture failure, accounting for the ratio of 40%-50% in the damage of civilian element part, in the damage of the parts of military and aviation aircraft, proportion is then up to 90%; Visible, research prevention fatigue fracture, to explore fatigue crack-resistant mechanism most important, and it is improve the means that element part anti-fatigue life is maximally efficient that the surface of component of machine carries out intensive treatment.
Metal material surface working hardening is to utilize mechanical energy to make surface of the work produce plastic deformation, the method causing surface deformation strengthening, is also known as surface deformation strengthening. The method of surface deformation strengthening currently mainly has spray (throwing) ball, rolling and three kinds of techniques of hole extruding.
Surface shot blasting strengthening technique: be not subject to the restriction of material category, material static strength, part geometry shape due to it, and cost is low, strengthening effect is notable, causes the manufacturing very big concern of industrially developed country once coming out, in improving parts reliability and durability, obtain significant effect. Shot peening strengthening is a kind of good process improving metal parts fatigue behaviour. But in process, alternate load and temperature act on down under arms simultaneously, will there is stress relaxation in residual compressive stress; And alternate load is more big or temperature is more high, residual compressive stress is lax more fast.
Surface rolling is referred to as finish rolling hardening with hole extruding: surface rolling is particularly well-suited to the big part of simple shape, especially the structural stress concentration place that size changes suddenly, as the diameter of axle of train shaft, the tooth root of gear, crankshaft journal rounded corner place, after surface rolling processes, its fatigue life is all significantly improved. Hole extruding is to utilize the special instruments such as rod, lining, mould, and hole in piece part or periphery are extruded continuously, slowly, equably, forms the hardened layer of plastic deformation. Plastic deformation layer inner tissue structure changes, and causes working hardening, and produces residual compressive stress, reduces Hole Wall Roughness, and raising fatigue of materials intensity and stress corrosion ability is very effective.
Above several traditional material surface deformation strengthening techniques in association area and occasion achieved with important application, but there is limitation for some specific component surface and when having specific strengthening index request. It is mainly reflected in modern efficient fine precision part and is difficult to put to good use, in applying particularly in component surface strengthenings such as typical micropore, deep narrow slot, and the randomness of shot peening strengthening bullet impact and uncontrollability make strengthening effect be difficult to ensure reliably and pre-control.
For solving drawbacks described above, therefore prior art have also appeared ultrasound-enhanced processing method, in the work process of ultrasound-enhanced process, generally require the state and the process that are controlled ultrasound-enhanced work by the processing gap regulating between ultrasonic tool end and the workpiece needing to carry out intensive treatment, but the processing gap directly measured between ultrasonic tool end and workpiece in work process is extremely difficult, prior art relies on the experience of operator often or carries out manual adjustment by arranging the mode of scale, inefficiency, and precise controlling cannot be accomplished, and then cause the poor effect of intensive treatment.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is in that to provide a kind of ultrasound-enhanced on-line monitoring control method, device and ultrasound-enhanced device, it is capable of accurately regulating ultrasonic tool end and needing the processing gap carrying out between the workpiece of intensive treatment, improves the effect of ultrasound-enhanced process.
First aspect, embodiments provides a kind of ultrasound-enhanced on-line monitoring control method, including:
Measure voltage and the electric current at ultrasonic transducer two ends in the middle of work process in real time, obtain the momentary load impedance in the middle of work process according to described voltage and Current calculation;
Described momentary load impedance is compared with the standard termination impedance threshold prestored, obtains output control signal according to comparative result;
Control and regulation ultrasonic tool pommel and the processing gap length being reinforced between workpiece is controlled according to described output control signal.
In conjunction with first aspect, embodiments provide the first possible embodiment of first aspect, wherein:
Before control to adjust ultrasonic tool pommel and the processing gap length that is reinforced between workpiece according to described output control signal, also include: described output control signal is carried out power amplification.
Second aspect, the embodiment of the present invention additionally provides a kind of ultrasound-enhanced on-line monitoring and regulates device, including:
Survey calculation unit, for obtaining voltage and the electric current at ultrasonic transducer two ends in the middle of work process in real time, obtains the momentary load impedance in the middle of work process according to described voltage and Current calculation;
Comparing unit, for being compared with the standard termination impedance threshold prestored by described momentary load impedance, obtains output control signal according to comparative result;
Control performance element, for regulating ultrasonic tool pommel and the processing gap length being reinforced between workpiece according to described output control signal.
In conjunction with second aspect, embodiments provide the first possible embodiment of second aspect, wherein:
Described ultrasound-enhanced on-line monitoring regulates device, also includes:
Power amplification unit, for, before control to adjust ultrasonic tool pommel and the processing gap length that is reinforced between workpiece according to described output control signal, carrying out power amplification to described output control signal.
The third aspect, the embodiment of the present invention also provides for a kind of ultrasound-enhanced device, including:
Workbench, bed piece, ultrasonic vibrator, constant current source generator and servo controller, described workbench is used for placing workpiece to be fortified, described workbench is positioned at above described bed piece, and move relative to described bed piece, described ultrasonic vibrator is fixed on above bed piece by column;
Described ultrasonic vibrator includes: ultrasonic transducer, ultrasonic variable amplitude bar and ultrasonic tool, and the close one end being reinforced workpiece of described ultrasonic tool is spherical, for ultrasonic tool pommel;
The output electric current of described constant current source generator is that described ultrasonic transducer is powered, described ultrasonic transducer converts the electrical power that described constant current source generator exports to ultra sonic machinery oscillation power, described ultrasonic variable amplitude bar is used for coordinating ultrasonic transducer to change ultrasonic activation amplitude, described ultrasonic tool carries out surface Hardening Treatment to being reinforced workpiece by ultrasonic pulse, described workbench be used for placing described in be reinforced workpiece;
Described servo controller includes: the ultrasound-enhanced on-line monitoring described in any of the above-described embodiment regulates device, and described servo controller regulates device by described on-line monitoring and realizes described ultrasonic tool pommel and the feedback control processing gap length being reinforced between workpiece.
In conjunction with the third aspect, embodiments provide the first possible embodiment of the third aspect, wherein:
The movement of described workbench completes under driven by servomotor, and described servomotor is connected with servo controller;
Described by described on-line monitoring regulate device realize described ultrasonic tool pommel and be reinforced between workpiece processing gap length feedback control, including: by control Serve Motor Control workbench movement carry out ultrasonic tool pommel and be reinforced between workpiece processing gap length adjustment.
In conjunction with the third aspect, embodiments provide the embodiment that third aspect the second is possible, wherein:
Described constant current source generator includes: current acquisition unit, signal generating unit, comparing unit and electric current amending unit;
Described current acquisition unit is for gathering the input current of described ultrasonic transducer input;
Described signal generating unit is used for producing normalized current, and described normalized current includes the sinusoidal current that a frequency is fixing;
The input current of the described comparing unit described ultrasonic transducer input for being collected by described current acquisition unit compares with described normalized current, obtains comparative result;
Described electric current amending unit, for being adjusted the input current of described ultrasonic transducer input according to described comparative result.
In conjunction with the third aspect, embodiments provide the third possible embodiment of the third aspect, wherein:
Described according to described comparative result, the input current of described ultrasonic transducer input is adjusted, including:
The size of described input current is adjusted, obtains continuous current;
The frequency of described input current is adjusted, it is achieved frequency from motion tracking and maintenance.
In conjunction with the third aspect, embodiments provide the 4th kind of possible embodiment of the third aspect, wherein:
Described ultrasonic vibration generator is additionally operable to: coordinate the ultrasonic activation amplitude that ultrasonic transducer adjustment obtains to be 20 ± 2um by described ultrasonic variable amplitude bar.
In conjunction with the third aspect, embodiments provide the 5th kind of possible embodiment of the third aspect, wherein:
Described ultrasound-enhanced device, also includes: numerical control display, and described numerical control display is used for inputting targeted parameter value and measured parameter value, and by described targeted parameter value and described measured parameter value are compared the prioritization scheme providing ultrasound-enhanced process;
Described targeted parameter value includes: expection surface roughness, expection microhardness, expection surface residual stress and the expection coverage rate that workpiece finally to reach through surface Hardening Treatment;
Described measured parameter value includes: measurement obtains after surface Hardening Treatment works real surface roughness, actual microhardness, real surface residual stress and the actual coverage rate of workpiece.
The ultrasound-enhanced on-line monitoring control method provided in the above embodiment of the present invention, device and ultrasound-enhanced device, wherein on-line monitoring control method can draw the load impedance of system by the voltage and Current calculation measuring ultrasonic transducer two ends, and by this load impedance is compared with the standard termination impedance threshold preset, automatic control and adjustment ultrasonic tool pommel and the processing gap being reinforced between workpiece is come according to comparative result, overcome the experience relying on operator in prior art or carry out ultrasonic tool pommel by arranging the mode of scale and be reinforced between workpiece and process gap length regulate existing adjustment inefficiency, the defect of precise controlling and intensive treatment poor effect cannot be accomplished, the on-line monitoring that above-described embodiment provides on the one hand regulates the processing gap that device also is able to realize above-mentioned automatic control and adjustment ultrasonic tool pommel and be reinforced between workpiece, on the other hand, the ultrasound-enhanced device that above-described embodiment provides can be capable of above-mentioned automatic control and adjustment ultrasonic tool pommel and the processing gap being reinforced between workpiece equally.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, it is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, the accompanying drawing used required in embodiment will be briefly described below, it is to be understood that, the following drawings illustrate only certain embodiments of the present invention, therefore the restriction to scope it is not construed as, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other relevant accompanying drawings according to these accompanying drawings.
Fig. 1 illustrates the schematic flow sheet of a kind of ultrasound-enhanced on-line monitoring control method that one embodiment of the invention provides;
Fig. 2 illustrates that a kind of ultrasound-enhanced on-line monitoring that one embodiment of the invention provides regulates the structural representation of device;
Fig. 3 illustrates the structural representation of a kind of ultrasound-enhanced device that one embodiment of the invention provides.
Illustrate:
S110～S130, a kind of ultrasound-enhanced on-line monitoring control method step;
210, survey calculation unit; 220, comparing unit; 230, performance element is controlled;
301, column; 302, bed piece; 303, ultrasonic transducer; 304, ultrasonic variable amplitude bar; 305, ultrasonic tool pommel; 306, it is reinforced workpiece; 307, chamber is slided; 308, table top; 309, constant current source generator.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Generally can with various different configurations arrange and design with the assembly of the embodiment of the present invention that illustrate described in accompanying drawing herein. Therefore, below the detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit claimed the scope of the present invention, but is merely representative of the selected embodiment of the present invention. Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
At present for preventing metal works from fatigue fracture or damage in use occurring, it is required for before metal works comes into operation and metal works is carried out surface Hardening Treatment, ultrasound-enhanced is a kind of emerging intensifying method, the huge instantaneous energy that ultrasound-enhanced using ultrasound ripple produces, realize surface peening, but in order to further, more careful realization utilizes the ultrasound wave strengthening to surface of the work, need to control the processing gap length between ultrasonic tool head and workpiece, the method controlling this processing gap length at present is all carry out Artificial Control by the experience according to operator, control accurate not, objective, final surface Hardening Treatment effect cannot be made to reach the best, and in ultrasound-enhanced process work process, load (the object that namely ultrasonic tool of ultrasonic vibrator is machined, referred to herein as workpiece) form manufacturing process system with ultrasonic vibration system, load is more big, the impedance of whole system increases therewith, when overall impedance increases above the threshold values impedance of ultrasonic transducer, not only reduces working (machining) efficiency and precision, it is easier to damage transducer, reduces transducer service life.
Based on this, ultrasound-enhanced on-line monitoring control method that the application provides, device and ultrasound-enhanced device, it is possible to achieve be automatically adjusted the processing gap length between ultrasonic tool head and workpiece, it is achieved accurately control.
For ease of the present embodiment is understood, first the ultrasound-enhanced on-line monitoring control method of the one disclosed in the embodiment of the present invention is described in detail;
Embodiment as shown in Figure 1, provides a kind of ultrasound-enhanced on-line monitoring control method, comprises the steps: in the present embodiment
S110, the voltage measuring ultrasonic transducer two ends in the middle of work process in real time and electric current, obtain the momentary load impedance in the middle of work process according to described voltage and Current calculation;
S120, described momentary load impedance is compared with the standard termination impedance threshold prestored, obtain output control signal according to comparative result;
S130, control to adjust ultrasonic tool pommel and the processing gap length that is reinforced between workpiece according to described output control signal.
In the present embodiment, by adopting voltage and the electric current at negative-feedback circuit Real-time Collection ultrasonic transducer two ends, and obtain the momentary load impedance in system work process according to this voltage and Current calculation, and this momentary load impedance is compared with the standard termination impedance threshold prestored, when the momentary load impedance of detection exceedes the 5%-10% of default standard termination impedance threshold, back-off signal can be sent to the Bit andits control mechanism in ultrasonic tool pommel and/or the Bit andits control mechanism being reinforced Workpiece carrier, increase ultrasonic tool pommel and the processing gap being reinforced between workpiece, when not less than time then make above-mentioned Bit andits control mechanism be in lasting feeding state.
In a certain specific embodiment, the above-mentioned workpiece that is reinforced is positioned on workbench, this workbench is as the carrier being reinforced workpiece, its displacement is driven by servosystem, when the momentary load impedance of detection exceedes the 5%-10% of default load impedance threshold, send back-off signal and produce displacement to servo system control workbench; Otherwise maintain machining state and continue feeding.
The above-mentioned standard termination impedance preset is to demarcate setting according to leading indicators such as being reinforced the material type of workpiece of process, material comprehensive mechanical property and predetermined strengthening effect by repetition test.
In the above-described embodiment, before control to adjust ultrasonic tool pommel and the processing gap length that is reinforced between workpiece according to described output control signal, also include: output control signal is carried out power amplification.
The load impedance that the size in the processing gap between ultrasonic tool pommel and workpiece works with system becomes certain relatedness, and the load impedance of system work calculates after can passing through to measure the voltage at transducer two ends and electric current, in above-described embodiment, utilize the feature of this relatedness just, compare with standard termination impedance by measuring the momentary load impedance of system, then control the size in the processing gap of ultrasonic tool pommel and workpiece further according to comparative result, whole control system is a closed-loop feedback control system.
Reality directly measures processing processing gap and change is extremely difficult, embodiments herein mainly gathers the impedance parameter of certain dependency that becomes with processing gap of system of processing and indirectly reflects processing gap, and realizes automatic control and adjustment processing gap.
Embodiment as indicated with 2, present embodiments provides a kind of ultrasound-enhanced on-line monitoring and regulates device, including:
Survey calculation unit 210, for obtaining voltage and the electric current at ultrasonic transducer two ends in the middle of work process in real time, obtains the momentary load impedance in the middle of work process according to described voltage and Current calculation;
Comparing unit 220, for being compared with the standard termination impedance threshold prestored by described momentary load impedance, obtains output control signal according to comparative result;
Control performance element 230, for controlling to adjust ultrasonic tool pommel and the processing gap length being reinforced between workpiece according to described output control signal.
In the present embodiment, after survey calculation unit 210 measures the voltage and electric current obtaining ultrasonic transducer two ends, momentary load impedance is obtained according to this voltage and Current calculation, this momentary load impedance and standard termination impedance threshold are compared by comparing unit 220, obtain control signal according to result of the comparison, control performance element 230 and then regulate ultrasonic tool pommel and the processing gap length being reinforced between workpiece according to this control signal.
Preferably, the monitoring in above-described embodiment regulates device, also includes:
Power amplification unit, for, before control to adjust ultrasonic tool pommel and the processing gap length that is reinforced between workpiece according to described output control signal, carrying out power amplification to described output control signal.
Embodiment as shown in Figure 3, the present embodiment additionally provides a kind of ultrasound-enhanced device, and this ultrasound-enhanced device includes:
Including: workbench, bed piece 302, ultrasonic vibrator, constant current source generator 309 and servo controller, above-mentioned workbench is used for placing workpiece to be fortified, workbench is positioned at above bed piece 302, and move relative to this bed piece 302, above-mentioned ultrasonic vibrator is fixed on above bed piece 302 by column 301; And it may occur to persons skilled in the art that, ultrasonic vibrator is corresponding with the position being reinforced workpiece 306.
Above-mentioned ultrasonic vibrator includes: ultrasonic transducer 303, ultrasonic variable amplitude bar 304 and ultrasonic tool, and the close one end being reinforced workpiece of this ultrasonic tool is spherical, for ultrasonic tool pommel 306;
It should be noted that, ultrasonic variable amplitude bar and ultrasonic tool are set to integrative-structure in shape, and the ultrasonic tool at this place is not limited to spherical near the one end being reinforced workpiece, it is also possible to is other shapes, determines according to being specifically reinforced the factors such as the structure of workpiece, shape;
The output electric current of above-mentioned constant current source generator 309 is that ultrasonic transducer 303 is powered, ultrasonic transducer 303 converts the electrical power that constant current source generator 309 exports to ultra sonic machinery oscillation power, ultrasonic variable amplitude bar 304 is used for coordinating ultrasonic transducer 303 to change ultrasonic activation amplitude, and ultrasonic tool carries out surface Hardening Treatment by ultrasonic pulse to being reinforced workpiece; Preferably, in order to obtain preferably surface of the work intensive treatment effect, coordinating ultrasonic transducer 303 to arrange the ultrasonic activation amplitude making adjustment obtain by ultrasonic variable amplitude bar 304 is 20 ± 2um.
Above-mentioned servo controller includes: the ultrasound-enhanced on-line monitoring described in any of the above-described embodiment regulates device, and this on-line monitoring is regulated device and realized described ultrasonic tool pommel 305 and the feedback control processing gap length being reinforced between workpiece 306 by servo controller.
The movement of above-mentioned workbench completes under driven by servomotor, and this servomotor is connected with servo controller;
Servo controller carries out ultrasonic tool pommel and the adjustment processing gap length being reinforced between workpiece by controlling the movement of Serve Motor Control workbench.
Further, in the present embodiment, the above-mentioned workpiece that is reinforced is positioned on workbench, this workbench includes sliding chamber 307 and table top 308, further it is reinforced workpiece and is positioned over above the table top 308 of workbench, table top 308 is positioned at above sliding chamber 307, sliding chamber 307 is in the form of slot, and its concave part is positioned on the first guide rail of bed piece 302, between sliding chamber 307 and bed piece 302, between sliding chamber 307 and table top 308, relative motion all can occur; In the present embodiment, it is possible to being accomplished by above-mentioned relative motion, sliding chamber 307 completes under the effect of the first leading screw relative to the motion of bed piece 302, and this first leading screw and the first servomotor are connected; Table top 308 is positioned on the second guide rail of sliding chamber 307 upper surface, and the relative motion between sliding chamber 307 and table top 308 completes under the effect of the second leading screw, and this second leading screw and the second servomotor connect; It should be noted that, above-mentioned the first leading screw, the first guide rail, the first servomotor, the second leading screw, the second guide rail and the second servomotor are all marked not in the drawings, in the present embodiment, the structure of workbench and the mode being subjected to displacement are not limited to the scheme of above-mentioned character introduction, advance ball can also be provided with, by advance ball generation relative motion between table top and sliding chamber.
Preferably, the table top 308 of workbench is provided with fixture, for fixing the workpiece of pending intensive treatment.
And those skilled in the art it will be appreciated that above-mentioned first guide rail, the second guide rail and the first leading screw, the second leading screw size it suffices that be capable of the gap between ultrasonic tool pommel and workpiece is carried out the requirement of effectively adjustment.
In a certain embodiment, above-mentioned constant current source generator 309 includes: current acquisition unit, signal generating unit, comparing unit and electric current amending unit;
Current acquisition unit is for gathering the input current of ultrasonic transducer input;
Signal generating unit is used for producing normalized current, and this normalized current includes the sinusoidal signal electric current that a frequency is fixing;
The input current of the comparing unit ultrasonic transducer input for being collected by current acquisition unit compares with normalized current, obtains comparative result;
Electric current amending unit, for the input current of described ultrasonic transducer input being adjusted according to comparative result, including: the size of input current is adjusted, obtains continuous current; The frequency of input current is adjusted, it is achieved frequency from motion tracking and maintenance.
Current acquisition unit can by passing to comparing unit after the input current of transformer collection ultrasonic transducer herein, compare with the standard current value set, the amplitude of the input current of continuous ultrasonic transducer and frequency, thus the purpose that the input current that reaches ultrasonic transducer is constant.
In a certain specific embodiment, as preferably, above-mentioned ultrasound-enhanced device main performance index meets the following conditions: 1), ultrasound-enhanced device operating power is adjustable, and peak power is 150W; 2), ultrasonic tool pommel amplitude be 20 μm, adjustable; 3), ultrasonic frequency vibratory is 28KHz; 4) operating current is adjustable, and maximum operating currenbt is 0.3A;
Further, its specifically used process is as follows:
Step 410: workpiece to be fortified is fixed with fixture, correct installation Kistler dynamometer also connects computer; Adjustment instrument pommel and edge of work distance reach in the scope of operating distance; Set the parameter such as normalized current and load impedance threshold values in advance;
Step 420: under power-off state, utilizing the gap length that servo controller adjusts between ultrasonic tool pommel and surface of the work is zero; The amplitude adjustment working clearance corresponding further according to the ultrasonic tool pommel set makes it slightly larger than amplitude, it is preferable that make the working clearance more than amplitude 1-2um;
Step 430: switch on power, opens ultrasonic vibrator and controls switch, and feeding machine tool chief axis reaches predetermined work gap; Now have occurred and that ultrasound-enhanced, note observing strengthening region change and ultrasonic-frequency power supply supervision impedance variation;
Step 440: open platen auto-feed function, sets the parameter such as machine tool feed speed and displacement, and line monitoring regulates device and sends a signal to servo controller adjustment work top motion, and then is automatically adjusted the gap between ultrasonic tool pommel and workpiece;
Step 450: after being disposed, makes ultrasound-enhanced instrument ball end away from workpiece, closes ultrasonic-frequency power supply.
Step 460: preserve ultrasonic-frequency power supply and monitor impedance data and Kistler dynamometer measurement result.
In a certain specific embodiment, above-mentioned ultrasound-enhanced device also includes numerical control display, this numerical control display is used for inputting targeted parameter value and measured parameter value, and by described targeted parameter value and described measured parameter value are compared the prioritization scheme providing ultrasound-enhanced process;
Described targeted parameter value includes: expection surface roughness, expection microhardness, expection surface residual stress and the expection coverage rate that workpiece finally to reach through surface Hardening Treatment;
Described measured parameter value includes: measurement obtains after surface Hardening Treatment works real surface roughness, microhardness, surface residual stress and the coverage rate of workpiece.
Above-mentioned numerical control display includes: digital signal processor DSP, for target component and measurement parameter are compared and analyze, provide the control program of optimization, the control program of this optimization is as the complementary scheme of above-mentioned ultrasound-enhanced on-line monitoring control method, it is therefore an objective to reach to obtain final desired workpiece performance indications more accurately.
It should be noted that, in the description above, term, " on ", the orientation of the instruction such as D score or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication device or workpiece must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention. Additionally, term " first ", " second ", " the 3rd " are only for descriptive purposes, and it is not intended that indicate or hint relative importance.
It addition, in describing the invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly; Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two inside workpieces. For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.
The computer program based on the ultrasound-enhanced on-line monitoring method of load impedance, device that the embodiment of the present invention provides, including the computer-readable recording medium storing program code, the instruction that described program code includes can be used for performing the method described in previous methods embodiment, implement and referring to embodiment of the method, can not repeat them here.
If described function is using the form realization of SFU software functional unit and as independent production marketing or use, it is possible to be stored in a computer read/write memory medium. Based on such understanding, part or the part of this technical scheme that prior art is contributed by technical scheme substantially in other words can embody with the form of software product, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention. And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.
Claims (10)
1. a ultrasound-enhanced on-line monitoring control method, it is characterised in that including:
Measure voltage and the electric current at ultrasonic transducer two ends in the middle of work process in real time, obtain the momentary load impedance in the middle of work process according to described voltage and Current calculation;
Described momentary load impedance is compared with the standard termination impedance threshold prestored, obtains output control signal according to comparative result;
Ultrasonic tool pommel and the processing gap length being reinforced between workpiece is controlled to adjust according to described output control signal.
2. ultrasound-enhanced on-line monitoring control method according to claim 1, it is characterized in that, before control to adjust ultrasonic tool pommel and the processing gap length that is reinforced between workpiece according to described output control signal, also include: described output control signal is carried out power amplification.
3. a ultrasound-enhanced on-line monitoring regulates device, it is characterised in that including:
Survey calculation unit, for obtaining voltage and the electric current at ultrasonic transducer two ends in the middle of work process in real time, obtains the momentary load impedance in the middle of work process according to described voltage and Current calculation;
Comparing unit, for being compared with the standard termination impedance threshold prestored by described momentary load impedance, obtains output control signal according to comparative result;
Control performance element, for controlling to adjust ultrasonic tool pommel and the processing gap length being reinforced between workpiece according to described output control signal.
4. ultrasound-enhanced on-line monitoring according to claim 3 regulates device, it is characterised in that also include:
Power amplification unit, for, before control to adjust ultrasonic tool pommel and the processing gap length that is reinforced between workpiece according to described output control signal, carrying out power amplification to described output control signal.
5. a ultrasound-enhanced device, it is characterized in that, including: workbench, bed piece, ultrasonic vibrator, constant current source generator and servo controller, described workbench is used for placing workpiece to be fortified, described workbench is positioned at above described bed piece, and move relative to described bed piece, described ultrasonic vibrator is fixed on above bed piece by column;
Described ultrasonic vibrator includes: ultrasonic transducer, ultrasonic variable amplitude bar and ultrasonic tool, and the close one end being reinforced workpiece of described ultrasonic tool is spherical, for ultrasonic tool pommel;
The output electric current of described constant current source generator is that described ultrasonic transducer is powered, described ultrasonic transducer converts the electrical power that described constant current source generator exports to ultra sonic machinery oscillation power, described ultrasonic variable amplitude bar is used for coordinating ultrasonic transducer to change ultrasonic activation amplitude, described ultrasonic tool carries out surface Hardening Treatment to being reinforced workpiece by ultrasonic pulse, described workbench be used for placing described in be reinforced workpiece;
Described servo controller includes: the arbitrary described ultrasound-enhanced on-line monitoring of claim 3～4 regulates device, and described servo controller regulates device by described on-line monitoring and realizes described ultrasonic tool pommel and the feedback control processing gap length being reinforced between workpiece.
6. ultrasound-enhanced device according to claim 5, it is characterised in that the movement of described workbench completes under driven by servomotor, and described servomotor is connected with servo controller;
Described by described on-line monitoring regulate device realize described ultrasonic tool pommel and be reinforced between workpiece processing gap length feedback control, including: by control Serve Motor Control workbench movement carry out ultrasonic tool pommel and be reinforced between workpiece processing gap length adjustment.
7. ultrasound-enhanced device according to claim 5, it is characterised in that described constant current source generator includes: current acquisition unit, signal generating unit, comparing unit and electric current amending unit;
Described current acquisition unit is for gathering the input current of described ultrasonic transducer input;
Described signal generating unit is used for producing normalized current, and described normalized current includes the sinusoidal current that a frequency is fixing;
The input current of the described comparing unit described ultrasonic transducer input for being collected by described current acquisition unit compares with described normalized current, obtains comparative result;
Described electric current amending unit, for being adjusted the input current of described ultrasonic transducer input according to described comparative result.
8. ultrasound-enhanced device according to claim 7, it is characterised in that described according to described comparative result, the input current of described ultrasonic transducer input is adjusted, including:
The size of described input current is adjusted, obtains continuous current;
The frequency of described input current is adjusted, it is achieved frequency from motion tracking and maintenance.
9. ultrasound-enhanced device according to claim 5, it is characterised in that described ultrasonic vibration generator is additionally operable to: coordinate the ultrasonic activation amplitude that ultrasonic transducer adjustment obtains to be 20 ± 2um by described ultrasonic variable amplitude bar.
10. ultrasound-enhanced device according to claim 5, it is characterized in that, also include: numerical control display, described numerical control display is used for inputting targeted parameter value and measured parameter value, and by described targeted parameter value and described measured parameter value are compared the prioritization scheme providing ultrasound-enhanced process;
Described targeted parameter value includes: expection surface roughness, expection microhardness, expection surface residual stress and the expection coverage rate that finally to reach through surface Hardening Treatment of workpiece;
Described measured parameter value includes: measurement obtains after surface Hardening Treatment works real surface roughness, microhardness, surface residual stress and the coverage rate of workpiece.
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| CN114101015A (en) * | 2022-01-25 | 2022-03-01 | 深圳市大族光电设备有限公司 | Ultrasonic transducer and control system, method and device thereof |
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