CN106499716A - A kind of cylinder bolt automatic load sharing method of improvement - Google Patents
A kind of cylinder bolt automatic load sharing method of improvement Download PDFInfo
- Publication number
- CN106499716A CN106499716A CN201610989377.3A CN201610989377A CN106499716A CN 106499716 A CN106499716 A CN 106499716A CN 201610989377 A CN201610989377 A CN 201610989377A CN 106499716 A CN106499716 A CN 106499716A
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- Prior art keywords
- bolt
- cylinder
- alloy
- load sharing
- cylinder bolt
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000006872 improvement Effects 0.000 title abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 32
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000035882 stress Effects 0.000 description 15
- 229910001000 nickel titanium Inorganic materials 0.000 description 14
- 230000009466 transformation Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000036299 sexual function Effects 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The invention discloses a kind of cylinder bolt automatic load sharing method of improvement, which installs NiTiNb alloy pads, Ni in the alloy pad on cylinder bolt:Ti:Nb mol ratios are 46:47:7.After the NiTiNb alloy pads of the loading present invention, the unevenness between each bolt group is adjusted, and dynamic stress substantially reduces, with the significant effect for carrying power transmission and preventing and treating bolt fracture.
Description
Technical field
A kind of the present invention relates to cylinder cap technical field, more particularly to IC engine cylinder bonnet bolt automatic load sharing method.
Background technology
Diesel locomotive cylinder bolt is the crucial primary structure member for connecting combustion engine cylinder head and body, and which adopts high intensity spiral shell
Bolt group.The bolt group is born in the collective effect of pretightning force, dynamic stress and thermal stress, and each bolt in the course of the work
Stress is extremely uneven, easily causes indivedual bolt overload, causes plastic deformation or fatigue rupture or the deformation of cylinder head, be
Sealing between cylinder head and body is deteriorated, and produces gas leak phenomenon, causes sending out for combustion engine powered decline or some serious accidents
Raw.Therefore, how to solve the load of cylinder bolt group and prevent breakage problem, be to be badly in need of one of key issue of solution at present.
With the development of science and technology, the construction scale of engineering structure increasingly maximizes and complicates, its quality is wanted
Ask increasingly strict.NiTi systems marmem has stable shape memory and superlastic sexual function, while also having excellent
The performances such as processability, intensity, wearability, corrosion resistance and biocompatibility, industrial automation, space flight and aviation, health care,
The industrial circle such as instrument and meter and machine-building is used widely.NiTi systems marmem can be made into various connections
Securing member, such as pipe joint, tight loop, connection sleeve pipe and fastening rivet etc..NiTi systems marmem is also that manufacture is driven simultaneously
Dynamic device and the elite clone of brake.Medically, NiTi alloys are compared with rustless steel, cochrome, with more excellent
Biocompatibility and low biological transformation.
102518640 A of CN disclose a kind of identical with traditional material elastomeric pads such as existing traditional high-carbon steel, rustless steels
Specification, same shape pad, are primarily adapted for the elastic gasket made of memory alloy materials of power equipment joint, and which adopts (52%) NiTi
Alloy, its are used for the power equipment joint for having electric current to flow through or have at the various terminal of temperature change requirement, because power frequency vibrations are produced
Raw bolt looseness and adstante febre spring shim will produce temperature deformation power, and this power can increase the pressure of junction and reduce joint and connects
Electric shock resistance so as to energy saving, ensures safety suppressing to generate heat.
However, prior art focuses mostly in the improvement to bolt itself or bolt assembling method, without a kind of simple
Method is improving the load of bolt.
Content of the invention
It is an object of the invention to proposing IC engine cylinder bonnet bolt automatic load sharing method, the method can be realized existing automatically
Power transmission, solves cylinder bolt unbalance stress, overload breakage problem.
The earlier patent application " final cylinder bolt automatic load sharing method " of the application is installed using on cylinder bolt
NiTi alloy pads, Ni in the alloy pad:Ti mol ratios are 50.8:49.2, solve cylinder bolt unbalance stress, overload
Breakage problem.But that in actual use, it is found which has certain defect, i.e. hysteresis of phase transformation poor-performing, it is impossible to deal with wide in range
Working environment, applies in some high load engines, it is difficult to reach technical requirements.
It is that the present invention is employed the following technical solutions up to this purpose：
A kind of IC engine cylinder bonnet bolt automatic load sharing method of improvement, which installs NiTiNb alloy pads on cylinder bolt
Piece, Ni in the alloy pad:Ti:Nb mol ratios are 46:47:7.
The NiTiNb of the present invention is the marmem that developed based on NiTi based alloys. marmem
Metal material that a class possesses shape memory effect based on thermoelastic martensitic transformation, the phase-change characteristic of this kind of material except
Outside the dependence of temperature, also closely related with stress (or strain).In the memory for describing alloy with strain temperature characteristic
During characteristic, generally must also be using stress as a constraints, that is to say, that when stress is different, its strain temperature
Characteristic can also produce change.Therefore in the applied research of memorial alloy, it is necessary to synchronously examine stress, strain and temperature
Consider.In the characteristic of memorial alloy and alloy phase transition process closely related.
The microscopic structure of NiTiNb alloys is different from binary NiTi alloy, and its Dispersed precipitate on Ni-Ti matrixes in a large number
β-Nb phases particles and a small amount of (Ti, Nb)2Ni phases.NiTi matrix phases are B2 type superstructures, with body-centered cubic structure.β-
Nb phases are body-centered cubic structure, define the eutectic structure that exposes with NiTi matrix phases.NiTiNb alloy samples are at 850 DEG C to 1000
Heat within the temperature range of DEG C, its microscopic structure does not occur significantly change.When temperature is lifted to 1050 DEG C, β-Nb phase particles
Start significantly agglomeration, but coarsening rate is very slow.When temperature is lifted to 1100 DEG C, the speed of growing up of β-Nb phase particles
Degree substantially speeds.
In NiTi alloys, add Nb improve hysteresis of phase transformation property, its main cause be Nb solid solutions with NiTi matrixes in and
The martensitic phase transformation kinetics of alloy are changed, the true yield force of alloy has been significantly increased, has been improve the elasticity of phase transformation
Strain energy so that the driving force of martensite reverse transformation is discharged in predeformation, will obtain the higher hysteresis of phase transformation.
Through numerous proportionings, the wide transformation hysteresis of the alloy depend primarily on phase transformation and the microstructure of alloy to the present invention, send out
Now only work as Ni:Ti:Nb mol ratios are 46:47:7, the bolt ability automatic load sharing of the present invention, the used time of power transmission, possess more preferably
Wide transformation hysteresis.
The selection of the specific Ni46Ti47Nb7 alloys of the present invention, show with theoretical derivation based on many experiments, which is not
Be tested by limited number of time i.e. confirmable.
The present invention once attempted making pad using Ni44Ti47Nb9 alloy materials, but the pad for obtaining is in cylinder bolt
Use in, can not carry power transmission completely, its hysteresis quality is poor, do not reach the present invention technical requirements.
The Ni46Ti47Nb7 alloy pads of the present invention, do not have particular requirement to shape, specification.Which can be with existing tradition
The traditional material elastomeric pad same size such as high-carbon steel, rustless steel, same shape pad.
The cylinder bolt automatic load sharing method of the present invention, by adopting special Ni46Ti47Nb7 alloys pad, realizes certainly
The power transmission of dynamic load, solves cylinder bolt unbalance stress, overload breakage problem.Through actually used checking, the method for the present invention is used,
All there is not unbalance stress, the problem of overload fracture in 10000 bolts, and its applied environment is extremely extensive.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
Preparation method is prepared by conventional, Ni46Ti47Nb7 alloy pads is obtained, is applied to east wind 4B diesel locomotives
On cylinder of diesel engine bonnet bolt, and each operating mode that diesel engine bench is tested is tracked, test the quiet dynamic stress size of its bolt.
During static test, the signal of foil gauge output is received and recorded by YJ-25 statical strain indicator, strains during dynamic test
The signal of piece output is received by MCC-8A dynamic strain indicators, is recorded various signals using MR-30 tape recorders, and is passed through
CS2092 signal analyzers analyze bolt group various Dynamic Signals in the course of the work in real time.
After cylinder bolt is tightened, the size of 4th cylinder and 12nd cylinder pretightning force, test result table are tested by regulation torque
Bright, the NiTi alloys pad for installing the present invention additional is not affected on the average pretightning force of cylinder bolt, but between each bolt of cylinder cap
Pretightning force degree of irregularity be reduced to 3.7 by the 14.2 of conventional pads.
Tracking diesel engine bench test each main operating mode, respectively test the 4th cylinder and the 12nd cylinder in working order under spiral shell
Bolt dynamic stress, after its result can be seen that the Ni46Ti47Nb7 alloy pads of the loading present invention, the dynamic stress of cylinder bolt
Substantially reduce.When power is 2646kW, its dynamic stress reduces 14 compared to loading conventional pads, and unevenness is dropped by 21.9
Low to 3.3-4.7.
Above-mentioned test proves, the unevenness after loading the Ni46Ti47Nb7 alloy pads of the present invention, between each bolt group
It is adjusted, dynamic stress substantially reduces, therefore there is the significant effect for carrying power transmission and preventing and treating bolt fracture.
Claims (3)
1. a kind of cylinder bolt automatic load sharing method, which installs NiTiNb alloy pads, the alloy pad on cylinder bolt
Middle Ni:Ti:Nb mol ratios are 46:47:7.
2. cylinder bolt automatic load sharing method as claimed in claim 1, it is characterised in that the cylinder bolt is IC engine cylinder
Bonnet bolt.
3. cylinder bolt automatic load sharing method as claimed in claim 2, it is characterised in that the internal combustion engine is diesel engine or vapour
Oil machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610989377.3A CN106499716A (en) | 2016-11-10 | 2016-11-10 | A kind of cylinder bolt automatic load sharing method of improvement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610989377.3A CN106499716A (en) | 2016-11-10 | 2016-11-10 | A kind of cylinder bolt automatic load sharing method of improvement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106499716A true CN106499716A (en) | 2017-03-15 |
Family
ID=58324038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610989377.3A Pending CN106499716A (en) | 2016-11-10 | 2016-11-10 | A kind of cylinder bolt automatic load sharing method of improvement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106499716A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101003868A (en) * | 2006-12-25 | 2007-07-25 | 华南理工大学 | Method for preparing shape memory nickel titanium alloy with gradient porosity |
| JP2008113958A (en) * | 2006-11-07 | 2008-05-22 | Japan Stent Technology Co Ltd | Stent |
| US20090068054A1 (en) * | 2005-05-23 | 2009-03-12 | Nec Tokin Corporation | Ti-Ni-Nb alloy device |
| US20120286480A1 (en) * | 2006-04-18 | 2012-11-15 | Anatoly Ivanovich Efremov | Negative creep corrugated gasket and methods of manufacturing same |
| CN104532035A (en) * | 2015-01-08 | 2015-04-22 | 中国石油大学(北京) | Metal nanocomposite material with linear superelasticity and high strength and preparation method thereof |
-
2016
- 2016-11-10 CN CN201610989377.3A patent/CN106499716A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090068054A1 (en) * | 2005-05-23 | 2009-03-12 | Nec Tokin Corporation | Ti-Ni-Nb alloy device |
| US20120286480A1 (en) * | 2006-04-18 | 2012-11-15 | Anatoly Ivanovich Efremov | Negative creep corrugated gasket and methods of manufacturing same |
| JP2008113958A (en) * | 2006-11-07 | 2008-05-22 | Japan Stent Technology Co Ltd | Stent |
| CN101003868A (en) * | 2006-12-25 | 2007-07-25 | 华南理工大学 | Method for preparing shape memory nickel titanium alloy with gradient porosity |
| CN104532035A (en) * | 2015-01-08 | 2015-04-22 | 中国石油大学(北京) | Metal nanocomposite material with linear superelasticity and high strength and preparation method thereof |
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Application publication date: 20170315 |
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