CN106755943B - A method of reducing bellows internal stress - Google Patents
A method of reducing bellows internal stress Download PDFInfo
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- CN106755943B CN106755943B CN201611079775.8A CN201611079775A CN106755943B CN 106755943 B CN106755943 B CN 106755943B CN 201611079775 A CN201611079775 A CN 201611079775A CN 106755943 B CN106755943 B CN 106755943B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
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Abstract
The invention discloses a kind of methods for reducing bellows internal stress.Method includes the following steps: bellows is fixed in vibration tong component, vibration tong is fixed on vibration device；Vibration device is vibrated into preset time in preset frequency, obtains the bellows of internal stress reduction.By means of technical solution of the present invention, bellows internal stress can be made to be greatly lowered, other performances of the materials such as its rigidity and hardness are unaffected simultaneously, infrared acquisition field refrigerator bellows can effectively be solved can only be by the natrual ageing stored for a long time come the drawbacks of discharging internal stress, the problem of the generally existing stability difference of bellows-type demand flow cooler can be improved well, and technology difficulty is low, it is easy to operate.
Description
Technical field
The present invention relates to refrigerating field, in particular to a kind of method for reducing bellows internal stress.
Background technique
Micro-miniature refrigerator has many advantages, such as that compact-sized, small in size, light-weight, starting is fast, is widely used in military
In infra-red thermal imaging system, according to application difference, it is generally divided into self-adjustable and quick start two major classes, and bellows system
Cooler is a kind of most common self-adjustable refrigerator.As the crucial regulating mechanism of refrigerator, bellows is to pass through precision
The precise thin wall pieces that micro- electroformed nickel-cobalt alloy is formed, cast layer thickness is only 0.1mm.And inevitably make during micro- electroforming
Cast layer generates certain macroscopical internal stress, especially even more serious to thin-wall part, its mechanical performance and part forming to electroformed layer
Have a significant impact, easily cause matrix deformation (such as distortion, length variation) or generate cracking, usually has to mechanical performance high-precision
Desired occasion is spent, cast layer internal stress is the smaller the better.
Currently, there is also the problems of stability difference to be difficult to overcome for self-adjustable refrigerator bellows.Cause refrigerator stationary flow
The main reason for amount fluctuation is since mechanical property requirements precision of the refrigerator to regulating mechanism is high, and in bellows itself exists
Stress does not discharge thoroughly, when refrigerator after repeatedly working and by external environment variation influenced, bellows remnants in answer
Power continues to discharge, and causes the generation of its own length slightly to change, needle is moved with throttle orifice relative position, causes product
Regime flow changes again, influences refrigerator stability.And how to realize bellows mentions its internal stress before debugging
Before release, for improve refrigerator self-adjusting mechanism the particularly important and of the invention main research emphasis of stability and
Final goal.
Summary of the invention
Interior answer can only be discharged by the natrual ageing stored for a long time in order to solve infrared acquisition field refrigerator bellows
The drawbacks of power, improves the stability of refrigerator self-adjusting mechanism, and the present invention provides in a kind of reduction self-adjustable refrigerator bellows
The method of stress.
A kind of method reducing bellows internal stress provided by the invention, comprising the following steps:
Bellows is fixed in vibration tong component, the vibration tong is fixed on vibration device；
The vibration device is vibrated into preset time in preset frequency, obtains the bellows of internal stress reduction.
Beneficial effects of the present invention are as follows:
The embodiment of the present invention vibrates preset time in preset frequency by that will be equipped with the vibration device of bellows, i.e., by wave
Line pipe carry out vibration stress relief treatment, bellows internal stress can be made to be greatly lowered, at the same the materials such as its rigidity and hardness other
Performance is unaffected, and can effectively solve infrared acquisition field refrigerator bellows can only be released by the natrual ageing stored for a long time
The drawbacks of putting internal stress can improve the problem of the generally existing stability difference of bellows-type demand flow cooler well, and technique is difficult
Spend it is low, it is easy to operate.
Detailed description of the invention
Fig. 1 is the flow chart of the reduction bellows internal stress method of the embodiment of the present invention；
Fig. 2 is 1 vibration stress relief treatment of present example front and back diffraction angle to diffraction crystal face azimuth sin2The angle of ψ is closed
It is schematic diagram；
Fig. 3 is 2 vibration stress relief treatment of present example front and back diffraction angle to diffraction crystal face azimuth sin2The angle of ψ is closed
It is schematic diagram.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
Interior answer can only be discharged by the natrual ageing stored for a long time in order to solve infrared acquisition field refrigerator bellows
The drawbacks of power, improve refrigerator self-adjusting mechanism stability, the present invention provides it is a kind of reduce bellows internal stress method, with
Lower combination attached drawing and embodiment, the present invention will be described in further detail.It should be appreciated that specific implementation described herein
Example is only used to explain the present invention, does not limit the present invention.
According to an embodiment of the invention, providing a kind of method for reducing bellows internal stress, Fig. 1 is the embodiment of the present invention
Reduction bellows internal stress method flow chart, as shown in Figure 1, according to an embodiment of the present invention reduce bellows internal stress
Method includes following processing:
Step 101, bellows is fixed in vibration tong component, the vibration tong is fixed on vibration device；
Step 102, the vibration device is vibrated into preset time in preset frequency, obtains the ripple of internal stress reduction
Pipe.
Specifically, the vibration tong component includes straight hole plate and flange；It include several straight holes on the straight hole plate, often
A straight hole is connected by screw to a flange, forms several bellows accommodating chambers.
Specifically, the material of the vibration tong is stainless-steel sheet.
Specifically, further include hollow bellows protective case in the bellows accommodating chamber, the bellows protective case
The internal diameter of outer diameter and the straight hole matches.
Specifically, the bellows of the embodiment of the present invention includes different bellows bottom section, bellows middle section and the ripple of outer diameter
Tube top section；
The bellows protective case includes ripple protection of pipe bottom set and ripple protection of pipe top cover；
Ripple protection of pipe bottom set is located at the bottom end of the straight hole, for protecting bellows bottom section, in bellows
Section, the internal diameter of ripple protection of pipe bottom set and the outer diameter in the bellows middle section match, as a preferred technical solution, institute
The internal diameter for stating ripple protection of pipe bottom set is 0.07~0.15mm bigger than the outer diameter in the bellows middle section；
The ripple protection of pipe top cover is located at the top of the straight hole, for protecting the ripple tube top section, the ripple
The internal diameter of protection of pipe top cover and the outer diameter of the ripple tube top section match, and the bellows is protected as a preferred technical solution,
The internal diameter for protecting top cover is 0.02~0.05mm bigger than the outer diameter of the ripple tube top section.
Specifically, the hollow bellows protective case is hollow polytetrafluoroethylene (PTFE) cylinder.
Specifically, step 101, bellows is fixed in vibration tong component the following steps are included:
Ripple protection of pipe bottom set is placed in the straight hole, the bellows bottom section is inserted into the ripple downward
In the set of protection of pipe bottom；
The ripple protection of pipe top cover is inserted in the ripple tube top section, the flange is pressed into the straight hole, and is led to
It crosses screw to fix the flange and the straight hole, forms bellows accommodating chamber, the ripple described in the bellows accommodating chamber
Pipe is in compressive state.Specifically, decrement of the bellows in the bellows accommodating chamber be 0.4~0.6mm (preferably
0.5mm).It can prevent bellows four walls in vibration processes from receiving damage using above-mentioned steps.
More specifically, the bellows is self-adjustable refrigerator bellows.
The embodiment of the present invention vibrates preset time in preset frequency by that will be equipped with the vibration device of bellows, i.e., by wave
Line pipe carries out vibration stress relief treatment, and vibration stress relief treatment can be divided into low-frequency vibration and two kinds of high-frequency vibration.
Specifically, low-frequency vibration the following steps are included:
By the vibration device at 500~1000Hz (including 1000Hz) vibration 1~2 hour, internal stress reduction is obtained
Bellows.
Specifically, high-frequency vibration the following steps are included:
The vibration device is vibrated 1~2 hour in 5~2.5KHz, obtains the bellows of internal stress reduction.
The embodiment of the invention provides a kind of methods for reducing bellows internal stress by vibration stress relief treatment.Wherein, low
Frequency vibration rises the yield point of material, to improve the non-deformability of metal, achievees the purpose that stable workpiece size；High frequency
Resonance on the microcosmic exciting timeliness metallic particles scale of oscillating aging high frequency, reduces the dislocation of material internal, so after timeliness
Material property is closer to original unstress state, and macroscopic deformation very little substantially will not be because of the fatigue damage of its bellows.Vibration
Dynamic ageing treatment can substantially reduce the internal stress of bellows, improve the stability of refrigerator, fill up bellows self-regulated refrigeration
Device is applied in infrared seeker system in terms of refrigerating material for the first time in the blank in removal bellows internal stress direction, is to improve to be somebody's turn to do
A key breakthrough in terms of type refrigerator stability.
For the more detailed method for illustrating the present invention and reducing bellows internal stress, example 1 and example 2 are provided.
Example 1:
A kind of vibration stress relief treatment reduce the method for self-adjustable refrigerator bellows internal stress the following steps are included:
(1) polytetrafluoroethylene (PTFE) set is covered in any one straight hole of stainless steel vibration tong, and experiment bellows is put into
In straight hole, fixed by flange with screw.
(2) vibration tong equipped with bellows is put on the shake table of vibration device, and stablizes and fixes.Vibration frequency is set
It is set to 500Hz, vibrates 1 hour, the bellows taken out after vibration is as subtracted by internal stress after vibration processing timeliness
Small bellows.
According to material analysis method, Stress calculation formula σ=KM, wherein K is Stress Constants, and M is diffraction angle to diffraction
Crystal face azimuth sin2The variation slope of ψ is measured the angular relationship of bellows before and after the processing respectively with X-ray diffractometer, and is divided
Not Jing Guo process of fitting treatment obtain Fig. 2.Fig. 2 is 1 vibration stress relief treatment of present example front and back diffraction angle to diffraction crystal face azimuth
sin2The angular relationship schematic diagram of ψ, wherein DZ-1 line is the M value curve that the preceding measured data of vibration fit, and DZ-2 line is vibration
The M value curve that measured data fit after dynamic.As shown in Figure 2, slope M is changed before and after vibration, than vibration after vibration
What is become before dynamic is gentle, and by internal stress calculation formula, M value reduces, and illustrates that internal stress has a degree of after low-frequency vibration processing
Reduce.
Example 2:
A kind of vibration stress relief treatment reduce the method for self-adjustable refrigerator bellows internal stress the following steps are included:
(1) polytetrafluoroethylene (PTFE) set is covered in any one straight hole of stainless steel vibration tong, and experiment bellows is put into
In hole, fixed by flange with screw.
(2) vibration tong equipped with bellows is put on the shake table of vibration device, and stablizes and fixes.Vibration frequency is set
It is set to 2.5KHz, vibrates 1 hour, the bellows taken out after vibration is as obtained by internal stress after vibration processing timeliness
Reduced bellows.
According to material analysis method, Stress calculation formula σ=KM, wherein K is Stress Constants, and M is diffraction angle to spreading out
Penetrate crystal face azimuth sin2The variation slope of ψ measures the angular relationship of bellows before and after the processing with X-ray diffractometer respectively, point
Not Jing Guo process of fitting treatment obtain Fig. 3.Fig. 3 is 2 vibration stress relief treatment of present example front and back diffraction angle to diffraction crystal face azimuth
sin2The angular relationship schematic diagram of ψ, wherein DZ-3 line is the M value curve that the preceding measured data of vibration fit, and DZ-4 line is vibration
The M value curve that measured data fit after dynamic.From the figure 3, it may be seen that slope M is changed before and after vibration, than vibration after vibration
What is become before dynamic is gentle, and by internal stress calculation formula, M value reduces, and illustrates that internal stress has a degree of after high-frequency vibration processing
Reduce.
Table 1 is internal stress contrast table before and after 2 bellows vibration stress relief treatment of example 1 and example, the σ in table 11Indicate vibration
The stress value of bellows, σ before ageing treatment2Bellows stress value after indicating vibration stress relief treatment, σkIndicate vibration stress relief treatment
The stress difference of front and back, σk=σ1-σ2, k expression internal stress elimination factor, k=σk/σ1.As shown in Table 1, low-frequency vibration processing makes ripple
Pipe internal stress is reduced to+62MPa by+100MPa, and elimination factor reaches 38%；High-frequency vibration processing make bellows internal stress by-
70MPa is reduced to -37MPa, and elimination factor reaches 47.1%.
| Number | Temperature/frequency | Time (h) | σ1(MPa) | σ2(MPa) | σk(MPa) | K (%) |
| Example 1 | 500Hz | 1 | +100 | +62 | 38 | 38 |
| Example 2 | 2.5KHz | 1 | -70 | -37 | 33 | 47.1 |
Table 1
Table 2 is rigidity value contrast table before and after 2 bellows vibration stress relief treatment of example 1 and example.As shown in Table 2, before vibration
The rigidity of bellows does not change a lot afterwards, this has great importance to the stability of material for maintaining bellows.
| Number | Before heat treatment (g/mm) | After heat treatment (g/mm) |
| Embodiment 1 | 258 | 247 |
| Embodiment 2 | 234 | 240 |
Table 2
The present invention is to use vibration stress relief treatment process simple to operation in the field for the first time, and technology difficulty is low, can be big
Amplitude reduction bellows internal stress, workpiece macroscopic deformation amount is minimum, will not cause the fatigue damage of workpiece substantially；The present invention provides
Method improve refrigerator critical component-regulating mechanism mechanical precision to a certain extent, greatly save the debugging in later period
Process improves product stability so as to shorten fabrication cycle, and then improves working efficiency, increases production capacity.Side provided by the invention
The research and development of precise thin-wall device use in the perfect infrared acquisition field of method, have especially filled up bellows demand flow cooler and are going
It is a key breakthrough in terms of improving the type refrigerator stability except the blank in bellows internal stress direction.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (1)
1. a kind of method for reducing bellows internal stress, which comprises the following steps:
Bellows is fixed in vibration tong component, the vibration tong component is fixed on vibration device, wherein described
Bellows is self-adjustable refrigerator bellows；
The vibration device is vibrated into preset time in preset frequency, to reduce the internal stress of bellows；
The preset frequency is 1~2.5KHz, and the preset time is 1~2 hour；
The vibration tong component includes straight hole plate and flange；It include several straight holes on the straight hole plate, each straight hole is equal
It is connected by screw to a flange, forms several bellows accommodating chambers；
It further include hollow bellows protective case in the bellows accommodating chamber；
The bellows includes different bellows bottom section, bellows middle section and the ripple tube top section of outer diameter；
The bellows protective case includes ripple protection of pipe bottom set and ripple protection of pipe top cover；
Ripple protection of pipe bottom set is located at the bottom end of the straight hole, for protecting the bellows bottom section and bellows middle section,
The internal diameter of ripple protection of pipe bottom set and the outer diameter in the bellows middle section match；
The ripple protection of pipe top cover is located at the top of the straight hole, and for protecting the ripple tube top section, the bellows is protected
The outer diameter of the internal diameter and the ripple tube top section that protect top cover matches；
Bellows is fixed in vibration tong component the following steps are included:
Ripple protection of pipe bottom set is placed in the straight hole, the bellows bottom section is inserted into the bellows downward and is protected
In bottom protective cover；
The ripple protection of pipe top cover is inserted in the ripple tube top section, the flange is pressed into the straight hole, and pass through spiral shell
Nail fixes the flange and the straight hole；
The material of the straight hole plate is stainless-steel sheet；
The bellows protective case is polytetrafluoroethylene (PTFE) set.
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| CN109159438B (en) * | 2018-10-17 | 2024-05-28 | 贵州红阳密封件有限责任公司 | Sealing strip stress relieving machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202485883U (en) * | 2011-11-30 | 2012-10-10 | 上海航天精密机械研究所 | Cabin segment type test piece axial general vibration clamp |
| JP2014005542A (en) * | 2013-08-20 | 2014-01-16 | Miyaden Co Ltd | High-frequency induction heating device |
| CN205280315U (en) * | 2015-11-16 | 2016-06-01 | 联合汽车电子有限公司 | Vibration anchor clamps |
-
2016
- 2016-11-30 CN CN201611079775.8A patent/CN106755943B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202485883U (en) * | 2011-11-30 | 2012-10-10 | 上海航天精密机械研究所 | Cabin segment type test piece axial general vibration clamp |
| JP2014005542A (en) * | 2013-08-20 | 2014-01-16 | Miyaden Co Ltd | High-frequency induction heating device |
| CN205280315U (en) * | 2015-11-16 | 2016-06-01 | 联合汽车电子有限公司 | Vibration anchor clamps |
Non-Patent Citations (2)
| Title |
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| 振动时效工艺在消除膨胀波纹管残余应力中的应用;刘晓丹等;《振动与冲击》;20151231;171-174 |
| 热处理和振动时效复合法消除膨胀;刘晓丹等;《热加工工艺》;20150331;第44 卷(第6 期);189-192 |
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