CN104318062A - Analyzing method of inorganic zinc rich paint film on end surfaces of wheel hub and main shaft - Google Patents
Analyzing method of inorganic zinc rich paint film on end surfaces of wheel hub and main shaft Download PDFInfo
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- CN104318062A CN104318062A CN201410505746.8A CN201410505746A CN104318062A CN 104318062 A CN104318062 A CN 104318062A CN 201410505746 A CN201410505746 A CN 201410505746A CN 104318062 A CN104318062 A CN 104318062A
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- zinc rich
- inorganic zinc
- rich paint
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Abstract
The invention relates to an analyzing method of an inorganic zinc rich paint film on end surfaces of a wheel hub and a main shaft. The analyzing method is used for the design calculation of film depth and the actual control of the film painting depth, and a great accident caused by a film rupture abnormal sound and friction coefficient reduction due to the improper film depth design or control is prevented. The calculating procedure of the film depth control is that the amax is calculated through a simple formula f=2S/N*root E*gamma/beta*amax, wherein S is the contact area of a bolting surface, N is the positive pressure of the bolting surface, f is the friction coefficient of the bolting surface, E is the elastic modulus of inorganic zinc rich paint, gamma is the energy density of the inorganic zinc rich paint film surface, beta is pi, and the amax is gap characteristic length or the film depth. According to the analyzing method, the simple formula is used to calculate the inorganic zinc rich paint depth, and the high repairing cost caused by the film rupture abnormal sound of the end surfaces of the wheel hub and the main shaft of an MW level wind driven generator is effectively avoided.
Description
Technical field
The present invention relates to the analytical approach of a kind of wheel hub and main shaft end face inorganic zinc rich paint paint film, belong to technical field of wind power generation, also can be used for the calculating of the inorganic zinc rich paint bolt surface lacquer film thickness of bridge, drilling platform etc.
Background technology
In MW class wind turbine, wheel hub and main shaft end face in order to anticorrosion, conduct electricity and keep enough friction factor, most design is at present used the inorganic zinc rich paint used in the Bridge Design of static load and is sprayed wheel hub and main shaft end face.But, because there is shock load more frequently in the rotation of MW class wind turbine wind wheel assembly, if spraying inorganic zinc rich paint film thickness is improper, the decline of friction factor can be caused, wheel hub and main shaft bolt end face is caused to be not enough to provide enough friction force, and then cause paint film to break and the frequent generation of abnormal sound, when paint film breaks to a certain extent and reaches pulverizing state, to connect with main shaft end face with regard to causing wheel hub and to lose efficacy and the fatigue of connecting screw rod is cut off, thus, cause overhang outside 80-100 rice high tower about 2 meters tens tons even the wind wheel assembly of up to a hundred tons the major accident of falling occur.Research wheel hub and main shaft end face spray inorganic zinc rich paint film thickness, significant to the generation of such accident of prevention.But at present not effectively analyze the method for film thickness for one, and then effectively cannot prevent the major accident that causes because paint film is broken.
Summary of the invention
The object of this invention is to provide the analytical approach of a kind of wheel hub and main shaft end face inorganic zinc rich paint paint film, for the designing and calculating of film thickness and the working control of paint film coating thickness, prevent because of film thickness design or control improper and paint film that is that cause and to break the problem of major accident that abnormal sound and friction factor decline and cause.
For achieving the above object, the solution of the present invention comprises: the analytical approach of a kind of wheel hub and main shaft end face inorganic zinc rich paint paint film, comprises the following steps:
1) according to exemplar feature and experimental test data determination bolt face contact area, bolt face normal pressure and bolt face friction co-efficient value.
2) according to formulae discovery paint film thickness angle value.
The calculation procedure of paint film thickness angle value is:
Adopt computing formula:
calculate a
max;
Wherein, S is the contact area in bolt face, and N is the normal pressure in bolt face, and f is the friction factor in bolt face, and E is the elastic modulus of inorganic zinc rich paint, and γ is inorganic zinc rich paint coating surface energy density, and β is π, a
maxfor " crack " characteristic length, namely meet the demands friction force F
fthe maximum film thickness of=fN.
Before the step calculating paint film thickness angle value, further comprising the steps of:
the calibration value of S, N of the known exemplar of middle substitution, then in conjunction with the measured value of a, f and the fixed value of β, calculates the value of inorganic zinc rich paint paint film characterisitic parameter E γ, the value of characterisitic parameter E γ is updated to computing formula
In.
The invention provides a kind of method of simple and effective analysis wheel hub and main shaft end face inorganic zinc rich paint film thickness, by the contact area in bolt face, the normal pressure in bolt face, the friction factor in bolt face, the data such as the characterisitic parameter of inorganic zinc rich paint, use simple formula just can calculate inorganic zinc rich paint film thickness, effectively take precautions against because of MW class wind turbine wheel hub and spindle end top-coat paint film break abnormal sound and cause highly reprocess expense.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the convexconcave part of the present invention to spraying zinc rich paint surface in contact processes by original in solid " crack ";
Fig. 2 is the schematic diagram that the present invention is calculated three-dimensional stress by More's graphing method bolt surface in contact cell cube.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
The object of the invention is to: to give way the current demand monitored without design and calculation method and the actual coating thickness of inorganic zinc rich paint temporarily for MW class wind turbine wheel hub and main shaft end face inorganic zinc rich paint film thickness, the analytical approach of a kind of wheel hub and main shaft end face inorganic zinc rich paint paint film is proposed, concession for the designing and calculating of film thickness and paint film coating thickness calculates, and prevents because of film thickness design or controls improper and paint film that is that cause and to break the problem of major accident that abnormal sound and bolt face friction factor decline and cause.
For design-calculated foundation, under mainly passing through the prerequisite of the certain bolt face friction factor of guarantee, find the engineering calculating method of the film thickness between a kind of bolt face, concrete steps are as follows:
Basic theories hypothesis of the present invention is that bolt surface is assumed to be continuous uniform, isotropic elastic solid (Hookean body), and wherein the convexconcave part equivalent-simplification of surface in contact is original in solid " crack " process, as shown in Figure 1.The characteristic dimension of equivalence " crack " is a, shearing friction power makes equivalence " crack " both sides tension, " crack " propagation direction is expanded along maximum crushing stress direction (the film thickness direction namely in present embodiment), therefore, " crack " two layers of material has common characteristic, if its elastic modulus is E, present embodiment is chosen by the elastic modulus of the principal ingredient zinc containing zinc 85% zinc rich paint.
Bolt top-coat paint film tensile stress sigma in the present invention
1with the relation of shear stress τ, be obtain according to biaxial stress circle More graphing method in the mechanics of materials.Method is as follows: the relation be directly proportional to normal pressure according to the friction force on surface of contact, if friction factor is f, normal pressure is N, by the pretightning force of bolt face bolt and the size of bolt number decision bolt normal pressure N, then and friction force F
f=fN; Because friction force acts on the contact area S of bolt face, then the shear stress that is subject to of bolt face
by biaxial stress circle More graphing method in the mechanics of materials, as shown in Figure 2, known shear stress can be analyzed to pure tension along 45 ° of directions in bolt plane
And compressive stress
In the present invention, friction factor f computing formula derives with the energy equilibrium suppressed according to " crack " expansion in fracturing mechanics.Equivalence " crack " characteristic dimension a is subject to the deformation energy that tension produces
with the fracture surface energy Us=2 γ a that maintenance " crack " characteristic dimension a does not expand
cinteract and obtain, the condition that " crack " characteristic dimension a does not expand is Δ U=U
s-U>=0, substitutes into above-mentioned formula after arranging and can obtain:
formula is known thus, and friction factor f is when there being bolt normal pressure N effect, and contact area S, elastic modulus E, equivalence " crack " characteristic dimension a, " crack " surface energy density on unit width are that (unit is J/m to γ
2) relevant, wherein surface energy density γ, according to the definition of fracturing mechanics, is by crack tension stress σ
1act on the fracture bond energy (being equivalent to capillary maintenance energy) absorbed in forming process, in hypothesis of the present invention, be somebody's turn to do the self-assembling formation that " crack " surface energy is zinc rich paint spraying and film forming procedure, due to the effect of bolt face normal pressure, " crack " surface size a
cincrease, the crimp of similar balloon, surface tension maintains can Us=2 γ a
c(N) also will increase, due to a
c>=a, a
c=a
c(N), can be changed to above-mentioned formula
get the critical condition Δ U=U that paint film does not break
s-U=0, and now a, a
c(N) all can be similar to and get maximal value a
maxcondition, the friction factor in bolt face can be obtained
for sake of convenience, be below reduced to
wherein, select β to be constant, E γ is that inorganic zinc rich paint paint film characterisitic parameter also can be set to constant, and formula can be reduced to further
Wherein
In the present invention, " crack " propagation direction along maximum crushing stress Directional Extension, i.e. film thickness direction; The characteristic dimension of equivalence " crack " is according to inorganic zinc rich paint film forming feature from outward appearance to inner essence, and the porous organization that the inorganic zinc rich paint after dry film is formed due to the volatilization of alcohol and the contraction of polymkeric substance, maximum hole depth touches matrix surface, therefore maximum hole depth is suitable with film thickness, and maximum hole depth is exactly to stablize equivalence " crack " the characteristic dimension a of tensile stress sigma
max, thus can by calculating characteristic dimension a
maxobtain film thickness.
Utilize
by substituting into the friction force F of measurement in lab
fthe known measurements of=fN, contact area S, film thickness a can calculate the characterisitic parameter K of inorganic zinc rich paint.
Because " crack " the surface energy density γ on elastic modulus E, unit width is relevant with coating processes with the selection of inorganic zinc rich paint, all belong to a kind of characteristic value of inorganic zinc rich paint, " crack " surface energy density γ 1 on the inorganic zinc rich paint elastic modulus E 1 of the surface in contact in testing laboratory, unit width, also " crack " the surface energy density γ 2 on suitable elastic modulus E 2, unit width should should be had with the inorganic zinc rich paint of the bolt face surface in contact of design, therefore, can ensure that the characteristic value E γ of inorganic zinc rich paint is similar to, and then, obtain constant parameter K.
Afterwards, friction factor f, the bolt normal pressure N that can require according to different designs, contact area S tri-variablees and parameter K, by formula
be converted to
carry out the calculating of film thickness.
Such as: zinc rich paint thickness requirement is coated with to wind turbine gearbox wheel hub and main shaft end face, certain famous foreign company relevant expert once required to require that the thickness of spraying inorganic zinc rich paint is 50 ± 10% μm to blasting treatment (roughness Rz50 μm), but reason does not provide, and the operation difficulty or ease of thickness ± 5 μm realize, about after half a year, this renowned company provides thickness must the requirement of 50-80 μm, whether designing requirement is suitable, by above-mentioned computing method, checks as follows:
The present invention is according to reference Zhang Yutian, Fig. 1 in " be coated with the slippage of inorganic zinc rich paint high-strength bolt connection and relax " on side mountain wide three, table 4, table 7, actual bolt contact surface area can be calculated by Fig. 1, paint film thickness in table 4 is drawn by actual measurement, bolt precompression in table 4 and tables of data 7 data skid resistance frictional coefficient be carry out according to measurement data the measuring and calculating value that converts, paint film thickness in such as table 4 82.9 μm, pressure 33.54t, with skid resistance frictional coefficient μ=0.722 corresponding in table 7, above data are all known test figure records, again in conjunction with bolt face contact area 1=(55+80+80+55) * 95 (mm in above-mentioned document legend
2) and chart in the data N1=33.54t of normal pressure, use formula
calculate the characteristic value E γ of inorganic zinc rich paint, (note: select identical β=π) obtains E γ=5.5734e+009 (PaJ/m
2).
By the MW blower fan main shaft of certain certain renowned company external design and the relevant data of wheel hub, input contact area S=0.84 (m
2), contact normal pressure N=48*535 (kN), after MW blower fan main shaft and the minimum friction factor of wheel hub require 0.3, foundation
calculate a, result about 86 μm.
Therefore, the film thickness that requires of famous foreign manufacturers design must suitable at 50-80 μm.The control of actual spraying paint film thickness should within 86 μm.
Equations of The Second Kind can be used for the guidance of film thickness in Analogy:
The requirement of 50-80 μm, film thickness maximal value a must be got according to the 2MW blower fan main shaft of certain famous foreign company above-mentioned research and the film thickness of wheel hub
max=80 μm, input contact area S=0.84 (m
2), contact normal pressure N=48*535 (kN), MW blower fan main shaft and the minimum friction factor designing requirement 0.3 of wheel hub, (note: select identical β=π) uses formula
the characteristic value E γ of inorganic zinc rich paint is calculated, obtains E γ=5.2851e+009 (PaJ/m
2).
So, Analogy: the calculating of the film thickness of certain famous foreign company 3MW blower fan main shaft and wheel hub, just can input contact area S=1.36 (m2), contact normal pressure N=2*48*535 (kN), after MW blower fan main shaft and the minimum friction factor of wheel hub require 0.3, foundation
calculate a, result about 52.48 μm.
Like this, be obviously not suitable for controlling, pass through formula
we can increase a is that 80, f is constant, and s is constant, and N=2*48*535 (kN) just can diminish, and namely reduces screw rod quantity, also reduces cost simultaneously.
Be presented above concrete embodiment, but the present invention is not limited to described embodiment.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present invention, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out embodiment without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (3)
1. an analytical approach for wheel hub and main shaft end face inorganic zinc rich paint paint film, it is characterized in that, described analytical approach comprises the following steps:
1) according to exemplar feature and experimental test data determination bolt face contact area, bolt face normal pressure and bolt face friction co-efficient value;
2) according to formulae discovery paint film thickness angle value.
2. the analytical approach of wheel hub according to claim 1 and main shaft end face inorganic zinc rich paint paint film, is characterized in that, the calculation procedure of described paint film thickness angle value is:
Adopt computing formula:
calculate a
max;
Wherein, S is the contact area in bolt face, and N is the normal pressure in bolt face, and f is the friction factor in bolt face, and E is the elastic modulus of inorganic zinc rich paint, and γ is inorganic zinc rich paint coating surface energy density, and β is π, a
maxfor " crack " characteristic length, namely meet the demands friction force F
fthe maximum film thickness of=fN.
3. the analytical approach of wheel hub according to claim 2 and main shaft end face inorganic zinc rich paint paint film, is characterized in that, before the step of described calculating paint film thickness angle value, analytical approach is further comprising the steps of:
the calibration value of S, N of the known exemplar of middle substitution, then in conjunction with the measured value of a, f and the fixed value of β, calculates the value of inorganic zinc rich paint paint film characterisitic parameter E γ, the value of characterisitic parameter E γ is updated to described computing formula
in.
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| CN201410505746.8A CN104318062B (en) | 2014-09-26 | 2014-09-26 | A kind of analysis method of wheel hub and main shaft end face inorganic zinc rich paint paint film |
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|---|---|---|---|
| CN201410505746.8A CN104318062B (en) | 2014-09-26 | 2014-09-26 | A kind of analysis method of wheel hub and main shaft end face inorganic zinc rich paint paint film |
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| CN104318062A true CN104318062A (en) | 2015-01-28 |
| CN104318062B CN104318062B (en) | 2018-02-16 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030089564A1 (en) * | 2001-02-23 | 2003-05-15 | Hiroshi Uehara | Rotating brake member of braking device for vehicle and method for antirust treatment thereof |
| CN101893427A (en) * | 2010-07-19 | 2010-11-24 | 哈尔滨飞机工业集团有限责任公司 | Method for measuring thickness of paint layer of composite material part |
-
2014
- 2014-09-26 CN CN201410505746.8A patent/CN104318062B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030089564A1 (en) * | 2001-02-23 | 2003-05-15 | Hiroshi Uehara | Rotating brake member of braking device for vehicle and method for antirust treatment thereof |
| CN101893427A (en) * | 2010-07-19 | 2010-11-24 | 哈尔滨飞机工业集团有限责任公司 | Method for measuring thickness of paint layer of composite material part |
Non-Patent Citations (3)
| Title |
|---|
| 佟瑞庭: "多层介质粗糙表面热弹塑性接触问题研究", 《中国优秀博硕士学位论文全文数据库 (硕士) 工程科技Ⅱ辑》 * |
| 王再德: "电泳涂装应用于铝合金汽车轮毂的研究", 《第11届车用涂料与涂装技术研讨会暨2013汽车涂料专委会年会》 * |
| 黄爱武 等: "风电机组轮毂与主轴联接异响问题分析", 《化工机械》 * |
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Granted publication date: 20180216 Termination date: 20200926 |