CN103757197B - For eliminating high-frequency vibration aging system and the method for small size component unrelieved stress - Google Patents
For eliminating high-frequency vibration aging system and the method for small size component unrelieved stress Download PDFInfo
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- CN103757197B CN103757197B CN201410037981.7A CN201410037981A CN103757197B CN 103757197 B CN103757197 B CN 103757197B CN 201410037981 A CN201410037981 A CN 201410037981A CN 103757197 B CN103757197 B CN 103757197B
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Abstract
High-frequency vibration aging system, comprises signal generator, power amplifier, shaking table, shakes a grade multiplying arrangement, charge amplifier, oscilloscope and treater; Treater control signal producer exports sinusoidal excitation signal; Grade multiplying arrangement that shakes is fixed on exciting table top, and acceleration transducer is connected with the input channel of charge amplifier respectively, and the output channel of charge amplifier is connected with oscilloscope respectively, and oscilloscope is connected with treater.The method eliminating small size component unrelieved stress comprises manufacture and to shake a grade multiplying arrangement; Manufacture briquetting; Small size component clamping is at upper saddle, and the second acceleration transducer is contained in saddle, and the first acceleration transducer is contained in low bottom-disc; Low bottom-disc is fixed on exciting table top; Determine the excited frequency of the high-frequency vibration timeliness that signal generator exports, high-frequency vibration ageing treatment is carried out to small size component, till the amplitude stability of the voltage waveform shown on oscilloscope.The present invention has the advantage can being eliminated small size component unrelieved stress by vibration.
Description
Technical field
The present invention relates to the high-frequency vibration aging system for eliminating small size component unrelieved stress and method, being particularly suitable for the small size components such as MEMS.
Technical background
Vibration aging technology is the method for removing residual stress that mechanical engineering field is conventional, by applying mechanical vibration load to component, when the unrelieved stress of component inside and additional vibratory stress and exceed material the local yielding limit time, make material that the viscous deformation of local occur, thus make the unrelieved stress of material internal be relaxed and reduce.
Traditional low-frequency oscillating aging adopts adjustable motor as exciting device, is to the dynamic stress of component effect large amplitude to eliminate unrelieved stress, and the macroscopic deformation amount of component is large, easily causes the fatigue damage of component.The component disclosing vibration stress relief treatment in the document of the people such as Rao Delin on << vibration and impact >> magazine " unrelieved stress of vibration aging on eliminating welding stainless steel plate " is the base plate of a large-scale experimental device, material is Ultralow Carbon Stainless Steel 304L, whole circular bottom plate diameter is 7.6m, adopt union-melt weld welding to form by five pieces of stainless steel plates, plate thickness is 75 mm.Superfine people welds at << that to disclose test steels tube material in the document " large longitudinal welded pipe thermal life and oscillating aging stress-removal technics comparing " on journal >> magazine be Q345 steel, it is of a size of length 12m, external diameter 800mm, wall thickness 40mm.Can find that traditional low-frequency oscillating aging is suitable for eliminating the unrelieved stress of large-size components by the Research Literature of traditional low-frequency oscillating aging, and adopt the low-frequency vibration ageing device of traditional buncher exciting to be difficult to clamping small size component.Therefore, traditional low-frequency oscillating aging cannot be used for the unrelieved stress eliminating small size component.
Summary of the invention
The shortcoming of unrelieved stress cannot be realized being eliminated by vibration small size component in order to overcome prior art; the invention provides a kind of high-frequency vibration aging system and the method for eliminating small size component unrelieved stress that can be eliminated unrelieved stress by vibration; this system and method is to eliminate unrelieved stress to the little amplitude dynamic stress of component effect; belong to exciting timeliness a little; component macroscopic deformation amount is little; component can be protected not by the danger of fatigue damage, be particularly useful for the unrelieved stress eliminating the small size components such as MEMS.
For eliminating the high-frequency vibration aging system of small size component unrelieved stress, comprising signal generator, power amplifier, shaking table, shake a grade multiplying arrangement, charge amplifier, oscilloscope and treater; The sinusoidal excitation signal that treater control signal producer output amplitude and frequency all can independently and continuously regulate; Sinusoidal excitation signal is through power amplifier inputted vibration platform;
Grade multiplying arrangement that shakes is fixed on the exciting table top of shaking table moving parts, and grade multiplying arrangement that shakes comprises saddle, is fixed on the low bottom-disc on exciting table top and the connecting rod being connected saddle and low bottom-disc; The section area of connecting rod is less than the section area of saddle, and the section area of connecting rod is less than the section area of low bottom-disc;
First acceleration transducer is installed on the upper surface of low bottom-disc, second acceleration transducer is installed on the upper surface of saddle, first acceleration transducer is connected with the first input channel of charge amplifier, second acceleration transducer is connected with the second input channel of charge amplifier, two output channels of charge amplifier are connected with oscilloscope respectively, and oscilloscope is connected with treater.
Specifically, small size component is clamped in the upper surface of saddle, under the resonant frequency of grade multiplying arrangement that shakes, carry out the process that high-frequency vibration eliminates unrelieved stress to small size component.The output that the output signal of the first acceleration transducer characterizes shaking table is shaken level
a 1, the output that the output signal of the second acceleration transducer characterizes grade multiplying arrangement that shakes is shaken level
a 2, the output of grade multiplying arrangement that shakes is shaken level
a 2be the level of shaking acted on small size component.The output that treater shows shaking table is in real time shaken level
a 1to shake level with the output of grade multiplying arrangement that shakes
a 2.Under the resonant frequency of grade multiplying arrangement that shakes during exciting, the output of grade multiplying arrangement that shakes is shaken level
a 2the output being greater than shaking table is shaken level
a 1, thus improve the eradicating efficacy of unrelieved stress.
Shaking table is greater than the high-frequency vibration of 1 kHz for generation of frequency, and its highest excited frequency can reach 10 more than kHz.
Further, the size of small size component is less than the diameter of saddle, to ensure that surface that small size component contacts with upper saddle is all positioned at the upper surface of upper saddle.
Further, small size component is clamped in the upper saddle of grade multiplying arrangement that shakes by briquetting, is provided with U-lag in the middle part of briquetting, and small size component is pressed between U-lag and upper saddle, briquetting by screw in compression in upper saddle.
The degree of depth of U-lag is less than the thickness of small size component, ensures that small size component can be pressed in U-lag.
Further, briquetting is U-shaped block, and the pressing table of briquetting both sides is connected with upper saddle by screw.
Further, the first acceleration transducer and the second acceleration transducer are piezoelectric acceleration transducer.
The method using high-frequency vibration aging system to eliminate small size component unrelieved stress comprises the following steps:
(1), grade multiplying arrangement that shakes is manufactured, grade multiplying arrangement that shakes comprises saddle, be fixed on the low bottom-disc on exciting table top and the connecting rod being connected saddle and low bottom-disc, the section area of connecting rod is less than the section area of saddle, and the section area of connecting rod is less than the section area of low bottom-disc;
(2), manufacture briquetting, be provided with U-lag in the middle part of briquetting, small size component is pressed between U-lag and upper saddle; The degree of depth of U-lag is less than the thickness of small size component;
(3), by small size component clamping at upper saddle; Second acceleration transducer is arranged on upper saddle, and the first acceleration transducer is arranged on low bottom-disc; Low bottom-disc is fixed on the exciting table top of shaking table, and low bottom-disc is connected by connecting rod with upper saddle; Connect the signal link between treater and signal generator and oscilloscope; Signal link between connection signal producer and power amplifier; Connect the signal link between acceleration transducer and charge amplifier; Connect the signal link between charge amplifier and oscilloscope; Connect the power supply of treater, power amplifier, signal generator, charge amplifier, oscilloscope, shaking table;
(4) excited frequency of the high-frequency vibration timeliness that signal generator exports, is determined
f;
(5), slowly the gain knob of regulating power amplifier make power amplifier export constant electric current I, drive shaking table to carry out high-frequency vibration ageing treatment to small size component, till the amplitude stability of the voltage waveform shown on oscilloscope.
Further, in step (4), determine the high-frequency vibration timeliness excited frequency that signal generator exports
fcomprise the following steps:
(4.1) initial firing frequency of signal generator
f 0be set to 1000 Hz, then with 100 Hz for step-length progressively increases the output frequency of signal generator; The gain knob of slow regulating power amplifier makes power amplifier export constant electric current I; When each excitation frequency recorded respectively by treater, the output of shaking table is shaken level
a 1to shake level with the output of grade multiplying arrangement that shakes
a 2; Treater calculates grade ratio that shakes of each excitation frequency
, obtain grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 1;
(4.2) initial firing frequency of signal generator be set to (
f 1-100) Hz, with 10 Hz for step-length progressively increases the output frequency of signal generator, then the process of repeating step (4.1), obtains grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 2;
(4.3) initial firing frequency of signal generator be set to (
f 2-10) Hz, with 1 Hz for step-length progressively increases the output frequency of signal generator, then the process of repeating step (4.1), obtains grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 3, be the excited frequency of high-frequency vibration timeliness
f.
Beneficial effect of the present invention is as follows:
1, by carrying out to small size component the process that high-frequency vibration eliminates unrelieved stress under the resonant frequency of grade multiplying arrangement that shakes, the output can amplifying shaking table is shaken level, namely improve the level of shaking acted on small size component, there is the unrelieved stress both can eliminating small size component significantly, the advantage that the macroscopic deformation amount of small size component is little simultaneously.
2, small size component is clamped in the upper saddle of grade multiplying arrangement that shakes, grade multiplying arrangement that shakes is fixed on the exciting table top of shaking table, thus overcome small size component and be difficult to directly be clamped in the shortcoming on shaking table exciting table top, there is the advantage reducing small size component and be difficult to clamping.
Accompanying drawing explanation
Fig. 1 is the high-frequency vibration aging system schematic diagram for eliminating small size component unrelieved stress.
Fig. 2 is grade multiplying arrangement schematic diagram that shakes.
Fig. 3 is briquetting schematic diagram.
Fig. 4 a is the front view of Cr12MoV quenching small size component.
Fig. 4 b is the vertical view of Cr12MoV quenching small size component.
Fig. 5 a is
xaxial unrelieved stress and the relation schematic diagram shaken between level.
Fig. 5 b is
yaxial unrelieved stress and the relation schematic diagram shaken between level.
Fig. 5 c is
xwith
yaxial residual stress relief ratio and the relation schematic diagram shaken between level.
Embodiment
Embodiment one
With reference to accompanying drawing, further illustrate the present invention:
For eliminating the high-frequency vibration aging system of small size component unrelieved stress, comprising signal generator, power amplifier, shaking table, shake grade multiplying arrangement 1, charge amplifier, oscilloscope and treater; The sinusoidal excitation signal that treater control signal producer output amplitude and frequency all can independently and continuously regulate; Sinusoidal excitation signal is through power amplifier inputted vibration platform;
Grade multiplying arrangement 1 that shakes is fixed on the exciting table top 6 of shaking table moving parts 7, and grade multiplying arrangement 1 that shakes comprises saddle 11, is fixed on the low bottom-disc 12 on exciting table top 6 and the connecting rod 13 being connected saddle 11 and low bottom-disc 12; The section area of connecting rod 13 is less than the section area of saddle 11, and the section area of connecting rod 13 is less than the section area of low bottom-disc 12;
First acceleration transducer 4 is installed on the upper surface of low bottom-disc 12, second acceleration transducer 5 is installed on the upper surface of saddle 11, first acceleration transducer 4 is connected with the first input channel of charge amplifier, second acceleration transducer 5 is connected with the second input channel of charge amplifier, two output channels of charge amplifier are connected with oscilloscope respectively, and oscilloscope is connected with treater;
Specifically, small size component 3 is clamped in the upper surface of saddle 11, under the resonant frequency of grade multiplying arrangement 1 that shakes, carry out the process that high-frequency vibration eliminates unrelieved stress to small size component 3.The output that the output signal of the first acceleration transducer 4 characterizes shaking table is shaken level
a 1, the output that the output signal of the second acceleration transducer 5 characterizes grade multiplying arrangement 1 that shakes is shaken level
a 2, the output of grade multiplying arrangement 1 that shakes is shaken level
a 2be the level of shaking acted on small size component 3.The output that treater shows shaking table is in real time shaken level
a 1to shake level with the output of grade multiplying arrangement 1 that shakes
a 2.Under the resonant frequency of grade multiplying arrangement 1 that shakes during exciting, the output of grade multiplying arrangement that shakes is shaken level
a 2the output being greater than shaking table is shaken level
a 1, thus improve the eradicating efficacy of unrelieved stress.
Shaking table is greater than the high-frequency vibration of 1 kHz for generation of frequency, and its highest excited frequency can reach 10 more than kHz.
The size of small size component 3 is less than the diameter D of saddle 11, to ensure that surface that small size component 3 contacts with upper saddle 11 is all positioned at the upper surface of upper saddle 11.
Small size component 3 is clamped in the upper saddle 11 of grade multiplying arrangement 1 that shakes by briquetting 2, is provided with U-lag 21 in the middle part of briquetting 2, and small size component 3 is pressed between U-lag 21 and upper saddle 11, briquetting 2 by screw in compression in upper saddle 11.
The degree of depth of U-lag 21 is less than the thickness of small size component 3, ensures that small size component 3 can be pressed in U-lag 21.
Briquetting 2 is U-shaped block, and the pressing table 22 of briquetting 2 both sides is connected with upper saddle 11 by screw.
First acceleration transducer 4 and the second acceleration transducer 5 are piezoelectric acceleration transducer.
The method using high-frequency vibration aging system to eliminate small size component unrelieved stress comprises the following steps:
(1), grade multiplying arrangement 1 that shakes is manufactured, grade multiplying arrangement 1 that shakes comprises saddle 11, be fixed on the low bottom-disc 12 on exciting table top 6 and the connecting rod 13 being connected saddle 11 and low bottom-disc 12, the section area of connecting rod 13 is less than the section area of saddle 11, and the section area of connecting rod 13 is less than the section area of low bottom-disc 12;
(2), U-shaped briquetting 2 is manufactured, briquetting 2 comprises U-lag 21 and forms with the pressing table 22 of both sides, h<d is met between the degree of depth h (mm) of U-lag 21 and the thickness d (mm) of small size component 3, pressing table 22 has open holes 23, U-type groove 21 is for installing small size component 3, and small size component 3 is pressed in upper saddle 11 by screw by pressing table 22;
(3), by small size component 3 clamping at upper saddle 11; Second acceleration transducer 5 is arranged on upper saddle 11, first acceleration transducer 4 and is arranged on low bottom-disc 12; Low bottom-disc 12 is fixed on the exciting table top 6 of shaking table, and low bottom-disc 12 is connected by connecting rod 13 with upper saddle 11; Connect the signal link between treater and signal generator and oscilloscope; Signal link between connection signal producer and power amplifier; Connect the signal link between acceleration transducer and charge amplifier; Connect the signal link between charge amplifier and oscilloscope; Connect the power supply of treater, power amplifier, signal generator, charge amplifier, oscilloscope, shaking table;
(4) excited frequency of the high-frequency vibration timeliness that signal generator exports, is determined
f;
(5), slowly the gain knob of regulating power amplifier make power amplifier export constant electric current I, drive shaking table to carry out high-frequency vibration ageing treatment, till the amplitude stability of the voltage waveform shown on oscilloscope to small size component 3.
In step (4), determine the high-frequency vibration timeliness excited frequency that signal generator exports
fcomprise the following steps:
(4.1) initial firing frequency of signal generator
f 0be set to 1000 Hz, then with 100 Hz for step-length progressively increases the output frequency of signal generator; The gain knob of slow regulating power amplifier makes power amplifier export constant electric current I; When each excitation frequency recorded respectively by treater, the output of shaking table is shaken level
a 1to shake level with the output of grade multiplying arrangement 1 that shakes
a 2; Treater calculates grade ratio that shakes of each excitation frequency
, obtain grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 1;
(4.2) initial firing frequency of signal generator be set to (
f 1-100) Hz, with 10 Hz for step-length progressively increases the output frequency of signal generator, then the process of repeating step (4.1), obtains grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 2;
(4.3) initial firing frequency of signal generator be set to (
f 2-10) Hz, with 1 Hz for step-length progressively increases the output frequency of signal generator, then the process of repeating step (4.1), obtains grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 3, be the excited frequency of high-frequency vibration timeliness
f.
To Fig. 4 a, the Cr12MoV quenching small size component 3 in 4b carries out the process that high-frequency vibration eliminates unrelieved stress.The length of this small size component 3 is 60mm, and width is 20mm, and thickness is 6mm.The excited frequency obtaining high-frequency vibration timeliness according to the determining step of high-frequency vibration timeliness excitation frequency is 2060 Hz,
xunrelieved stress before and after axial high-frequency vibration,
yunrelieved stress before and after axial high-frequency vibration, and
xwith
ybefore and after axial high-frequency vibration, residual stress relief ratio is shown in Fig. 5 a, Fig. 5 b and Fig. 5 c respectively.
Content described in this specification sheets embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the specific form that embodiment is stated, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (5)
1. for eliminating the high-frequency vibration aging system of small size component unrelieved stress, it is characterized in that: comprise signal generator, power amplifier, shaking table, shake a grade multiplying arrangement, charge amplifier, oscilloscope and treater; The sinusoidal excitation signal that treater control signal producer output amplitude and frequency all can independently and continuously regulate; Sinusoidal excitation signal is through power amplifier inputted vibration platform;
Grade multiplying arrangement that shakes is fixed on the exciting table top of shaking table moving parts, and grade multiplying arrangement that shakes comprises saddle, is fixed on the low bottom-disc on exciting table top and the connecting rod being connected saddle and low bottom-disc; The section area of connecting rod is less than the section area of saddle, and the section area of connecting rod is less than the section area of low bottom-disc;
First acceleration transducer is installed on low bottom-disc, second acceleration transducer is installed on saddle, first acceleration transducer is connected with the first input channel of charge amplifier, second acceleration transducer is connected with the second input channel of charge amplifier, two output channels of charge amplifier are connected with oscilloscope respectively, and oscilloscope is connected with treater;
The size of small size component is less than the diameter of saddle, and the surface that small size component contacts with upper saddle is all positioned at the upper surface of upper saddle;
Small size component is clamped in the upper saddle of grade multiplying arrangement that shakes by briquetting, is provided with U-lag in the middle part of briquetting, and small size component is pressed between U-lag and upper saddle, briquetting by screw in compression in upper saddle.
2. as claimed in claim 1 for eliminating the high-frequency vibration aging system of small size component unrelieved stress, it is characterized in that: briquetting is U-shaped block, the pressing table of briquetting both sides is connected with upper saddle by screw.
3. as claimed in claim 2 for eliminating the high-frequency vibration aging system of small size component unrelieved stress, it is characterized in that: the first acceleration transducer and the second acceleration transducer are piezoelectric acceleration transducer.
4. the method using high-frequency vibration aging system to eliminate small size component unrelieved stress comprises the following steps:
(1), grade multiplying arrangement that shakes is manufactured, grade multiplying arrangement that shakes comprises saddle, be fixed on the low bottom-disc on exciting table top and the connecting rod being connected saddle and low bottom-disc, the section area of connecting rod is less than the section area of saddle, and the section area of connecting rod is less than the section area of low bottom-disc;
(2), manufacture briquetting, be provided with U-lag in the middle part of briquetting, small size component is pressed between U-lag and upper saddle; The degree of depth of U-lag is less than the thickness of small size component;
(3), by small size component clamping at upper saddle; Second acceleration transducer is arranged on upper saddle, and the first acceleration transducer is arranged on low bottom-disc; Low bottom-disc is fixed on the exciting table top of shaking table, and low bottom-disc is connected by connecting rod with upper saddle; Connect the signal link between treater and signal generator and oscilloscope; Signal link between connection signal producer and power amplifier; Connect the signal link between acceleration transducer and charge amplifier; Connect the signal link between charge amplifier and oscilloscope; Connect the power supply of treater, power amplifier, signal generator, charge amplifier, oscilloscope, shaking table;
(4) excited frequency of the high-frequency vibration timeliness that signal generator exports, is determined
f;
(5), slowly the gain knob of regulating power amplifier make power amplifier export constant electric current I, drive shaking table to carry out high-frequency vibration ageing treatment to small size component, till the amplitude stability of the voltage waveform shown on oscilloscope.
5. the method using high-frequency vibration aging system to eliminate small size component unrelieved stress as claimed in claim 4, is characterized in that: in step (4), determines the high-frequency vibration timeliness excited frequency that signal generator exports
fcomprise the following steps:
(4.1) initial firing frequency of signal generator
f 0be set to 1000 Hz, then with 100 Hz for step-length progressively increases the output frequency of signal generator; The gain knob of slow regulating power amplifier makes power amplifier export constant electric current I; When each excitation frequency recorded respectively by treater, the output of shaking table is shaken level
a 1to shake level with the output of grade multiplying arrangement that shakes
a 2; Treater calculates grade ratio that shakes of each excitation frequency
, obtain grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 1;
(4.2) initial firing frequency of signal generator be set to (
f 1-100) Hz, with 10 Hz for step-length progressively increases the output frequency of signal generator, then the process of repeating step (4.1), obtains grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 2;
(4.3) initial firing frequency of signal generator be set to (
f 2-10) Hz, with 1 Hz for step-length progressively increases the output frequency of signal generator, then the process of repeating step (4.1), obtains grade ratio that shakes
frequency time maximum; This frequency under processor for recording, and be designated as
f 3, be the excited frequency of high-frequency vibration timeliness
f.
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| CN110760670B (en) * | 2019-12-03 | 2023-06-23 | 上海海事大学 | Intelligent high-frequency vibration aging system for eliminating residual stress of small-size component |
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