CN106226061B - A kind of solid mouse torque loading procedure sealing ring decrement online test method - Google Patents
A kind of solid mouse torque loading procedure sealing ring decrement online test method Download PDFInfo
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- CN106226061B CN106226061B CN201610782076.3A CN201610782076A CN106226061B CN 106226061 B CN106226061 B CN 106226061B CN 201610782076 A CN201610782076 A CN 201610782076A CN 106226061 B CN106226061 B CN 106226061B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/005—Sealing rings
Abstract
A kind of solid mouse torque loading procedure sealing ring decrement online test method, it is analyzed by the stress condition to screw thread, spring washer and sealing ring in the solid mouse loading procedure loaded on automatic loading device, screw thread in loading procedure, the relationship between spring washer and sealing ring institute stress and screw-down torque are obtained, loading procedure is divided into four-stage, delineates " torque-angle " ideal curve in loading procedure.By analyzing each stage slope of a curve of ideal curve, obtains angle value when starting Contact Seal ring position in loading procedure, sealing ring decrement is calculated.Sealing ring decrement is obtained by this method to be not required to that solid mouse is measured, marked and calculated again, reduces labor intensity, is avoided measurement error brought by repeatedly measuring, is realized the online real―time precision measurment of Miniature solid rocket sealing ring decrement.The method of the present invention can be used as the judgment basis that solid mouse tightens degree detecting.
Description
Technical field
The present invention relates to a kind of solid mouse torque loading procedure sealing ring decrement online test methods, belong to firer
Device assembles field.
Background technique
Solid mouse is a kind of typical Space Pyrotechnics Devices, using solid matter as propellant.When work, igniting
Device lights igniter cartridge, then lights propellant by igniter cartridge, and propellant combustion generates the combustion gas of high temperature and pressure, chemical energy
It is converted into thermal energy, combustion gas accelerates through nozzle expansion, conversion of heat into kinetic energy, excludes to generate and push away from jet pipe with high speed
Push dynamic guided missile or rocket flight forward.Solid mouse is widely used in the every field of aerospace craft, plays act foot
The effect of weight.In order to easy to assembly, between housing unit and nozzle component use thread connecting mode, and using sealing ring into
Row sealing.In order to guarantee leakproofness so that solid mouse can complete predetermined function, need to housing unit and jet pipe
Component is applied certain torque (generally hundreds of Nm) and is reliably connected with the screw thread guaranteed between housing unit and nozzle component.
Housing unit squeezes the sealing ring in advance in nozzle component during loading, so that sealing ring is compressed, to reach close
The purpose of envelope, but whether sealing ring is compressed to position and needs to measure decrement during loading.
It is the indirect measuring principle figure of sealing ring decrement, the sealing which uses with a thickness of 1mm as shown in Figure 5
Circle, screw pitch 1.5mm survey the actual step of sealing ring decrement at present are as follows: (1) measure.With calliper to measure L1, appoints and survey at 3 points
It averages, corresponding nozzle component number record, and mark to one convex key of housing unit, with calliper to measure housing unit end face
Occurrence away from this convex key end face distance L2, and corresponding housing component numerals record；(2) trial assembly.Housing unit and nozzle component
Check mark trial assembly.Sealing ring is packed into nozzle component seal groove, housing unit is screwed into, until twisting motionless, measures shell
It is L3 that stack face, which selectes the distance between convex key away from upper sequence, and corresponding housing component numerals record actual value, calculate L2-L3-L1
It should be greater than 1mm.Corresponding placement (not taking sealing ring) is removed with hand handle nozzle component again.(3) it marks.To inside housing unit zero
Nozzle component check mark is screwed on housing unit by part after the assembly is completed, with hand, and until twisting motionless, repetition measurement L3 calculates L2-
L3-L1 should be greater than 1mm.Two sections of paper self-adhesive tapes are pasted in nozzle component and housing unit seam crossing, in paper self-adhesive tape surface reddish oil
The property superfine end of marking pen makes marks line, and two sections of lines should be point-blank.(4) square is reinforced, sealing ring decrement is calculated.By jet pipe
Component is clamped on vice with fixture, is tightened nozzle component in place with spanner and torque spanner reinforcing square, with tape measure close to shell
Body component outer wall, measuring the housing unit arc length S between two mark lines should be greater than compressing 10% calculated arc length according to sealing ring
Value SIt is fixed, selecting convex key with sequence in calliper to measure should be less than L3 with nozzle component end face distance L4, L4.Calculate sealing ring compression
Amount: d=(1.5 × S)/(π × D), wherein D is housing unit diameter, and corresponding housing component numerals record d and S.
By measure sealing ring mode above it is found that sealing ring measurement need to repeatedly assemble, hand dipping and calculating, process it is multiple
Miscellaneous, cumbersome, large labor intensity, low efficiency is unable to satisfy the requirement of high density transmitting.
From the point of view of existing domestic and foreign literature, solve solid mouse torque loading procedure sealing ring decrement automatic or
Line detecting method has not been reported.
Summary of the invention
Technical problem solved by the present invention is for current solid mouse sealing ring measurement need to repeatedly assemble, measure and
It calculates, the problem of process is complicated, cumbersome, large labor intensity, low efficiency, proposes a kind of solid mouse torque and loaded
Journey sealing ring decrement online test method can not only improve the detection efficiency of solid mouse sealing ring decrement, reduce
Labor intensity, and measurement accuracy can satisfy engine request.
The technical scheme is that a kind of solid mouse torque loading procedure sealing ring decrement on-line checking side
Method, steps are as follows:
1) first paper tape equal with the nozzle component perimeter of rocket is divided into 360 parts, and is affixed on the mouth of nozzle component
Portion, each scale represent 1 ° of angle value；Second paper tape of only straight line label is affixed on to the oral area of housing unit simultaneously；Institute
The nozzle component stated directly is connected through a screw thread with housing unit, and is sealed for sealing ring；
2) when nozzle component and housing unit load, housing unit is fixed, nozzle component is loaded using torque spanner
Torque；When load, torque spanner scale records the corresponding spray of housing unit institute the second paper tape of labelling at this time since 1Nm
Tube assembly label the first paper tape scale value, is denoted as 0 °, then increases torque every 1Nm, after recording each torque value load
Corresponding angle value makes torque-angle curve figure until loading completion；
3) M is obtainedIt protects、MIf, P, t value, wherein MIt protectsTo protect torque value, MIfFor design requirement torque value, and MIt protects=MIf×
120%, P are nozzle component and housing unit thread pitch, and t is sealing ring thickness value；
4) η is setSettingFor the expected compression ratio of sealing ring, ηIt is practicalTo test the sealing ring compression ratio obtained, and meet ηIt is practical≤
ηSetting, 10%≤ηSetting≤ 30%, ηIt is practical=(d/t) × 100%, sealing ring decrement d=(△ A × P)/(360 × t)；From contact
Sealing ring starts the twisting angle △ A=A terminated to loadm- An, wherein AmThe angle that nozzle component turns at the end of for load
Value, AnThe angle value that nozzle component turns over when starting compression for sealing ring；
5) pass through formula Kn=(Mn+1-Mn)/(An+1-An), wherein M represents torque value, and A represents angle value, and footmark n is to turn round
Coordinate points on square-angle curve, K is torque-angle curve slope value, since first point on torque-angle curve,
Using continuous 7 points, totally 6 sections of curves are one group, successively carry out the calculating of slope difference, and every group of calculating is made toward one point of pusher later
It is new one group, meets △ K when a certain groupn-1< △ Kn< △ Kn+1< △ Kn+2< △ Kn+3When, wherein △ Kn-1=Kn- Kn-1,
I.e. slope rate continuity starts to increase, then records A at this timenValue；
6) continue to load nozzle component, continuously to AnIt is calculated, reaches any a kind of situation in following two situation, add
It carries and stops, and record the angle value A that turns over of nozzle component at the end of loadm, and calculate and obtain decrement d value；
A) it is loaded onto default protection torque MIt protectsBefore, the default compression ratio of satisfaction, i.e. η are loaded ontoIt is practical=ηSetting；
B) it is loaded onto default decrement ratio ηSettingBefore, torque value is loaded onto protection torque MIt protects, i.e. MIn real time=MIt protects。
The advantages of the present invention over the prior art are that: the present invention by theory analysis obtain influence torque load because
It is most importantly sealing ring in element, and other factors do not interfere with the variation of sealing ring torque-angle curve in loading procedure
Torque in entire loading procedure-angle curve approximation can be seen as torque-angle curve of sealing ring by trend, so as to
A calculating sealing ring decrement is taken on torque-angle curve of loading procedure.The present invention only need once to assemble can be completed it is close
Measurement is compressed in seal, eliminates intermediate measurement and calculates step, has saved the time of secondary assembly and survey calculation decrement,
Production efficiency is substantially increased, and realizes the on-line checking of sealing ring decrement.It is carried out by choosing certain solid mouse
The test result of contrast test is analyzed, and the method for the present invention does not reduce measuring accuracy while improving efficiency, in engineering model
It is feasible to enclose interior the method for the present invention.
Detailed description of the invention
Fig. 1 is typical solid mouse structure chart；
Fig. 2 is that screw thread tightens the initial stage (sealing ring is uncompressed) schematic diagram；
Fig. 3 is that screw thread tightens the stage (sealing ring is compressed) schematic diagram；
Fig. 4 is torque-angle ideal curve；
Fig. 5 a-5d is the indirect measuring principle figure of sealing ring decrement；
Fig. 6 spring washer force diagram；
Fig. 7 spring washer pressure-deformation spirogram；
Fig. 8 sealing ring pressure-deformation spirogram；
Fig. 9 sealing ring force diagram；
Figure 10 obtains torque value and angle value curve craft loading device schematic diagram；
Figure 11 the method for the present invention flow chart.
Specific embodiment
The present invention analyzes solid small fire arrow structure and assembling process.
In solid mouse nozzle component rundown process, nozzle component first with housing unit thread contact, then again
Grate is contacted, since grate is connected by powder column with spring washer, grate and powder column are rigidly larger, in assembling process
Almost without deformation, therefore the case where contact grate, can regard the direct contact spring washer of nozzle component as, and last housing unit connects
Sealing ring, and compresses seal are touched, is as shown in Figure 2,3 solid mouse loading procedure simple view, wherein 41~44 difference
For simulation nozzle component, simulation spring washer, simulation washer, simulation housing unit.The present invention provides one kind and can record in real time
The easy device of torque value and angle value relationship, the real-time torque value of corresponding record and angle value, and synthesis is turned round after loading is complete
Square-angle curve.By theory analysis obtain influence solid mouse torque load because being known as nozzle component and housing unit
Between the factors such as screw thread, spring washer and sealing ring, obtaining influences solid mouse torque to load most important factor to be sealing
Circle, and other factors do not interfere with sealing ring torque-angle curve variation tendency in loading procedure, will can entirely load
One section of approximation of torque-angle curve in journey is seen as torque-angle curve of sealing ring, so as in the torsion of loading procedure
A calculating sealing ring decrement is taken on square-angle curve.By carrying out theory analysis to torque-angle curve, show that slope connects
The continuous point increased that starts is that sealing ring starts to compress starting point, and passes through predetermined process parameter and protection torque MIt protects, compression magnitude
D, obtains decrement after being loaded, and can whether qualification determines to decrement.
One, sealing ring decrement and screw-down torque relationship
1) each factor of torque load is influenced
The solid mouse is by igniter cartridge 23, spring part 24, housing unit 25, powder column 26, holding screw 27, drug blocking
Plate 28, sealing ring 29, nozzle component 30 form.Igniter cartridge 23 is initially charged with when assembly inside housing unit 25, then by bullet
Spring part 24 be packed into housing unit 25 be adjacent to igniter cartridge 23, again by powder column 26 be packed into housing unit 25 be close to spring part 24, spraying
Reinforcing square (generally hundreds of N.m) is screwed into housing unit 25 after tube assembly 30 is packed into sealing ring 29, finally in nozzle component 30 and
Between housing unit 25 plus holding screw 27 is locking.
By analysis solid small fire arrow structure and assembling process, in 30 rundown process of solid mouse nozzle component, jet pipe
Component 30 with 25 thread contact of housing unit, then contacts grate 28 first again, since grate 28 passes through powder column 26 and bullet
Spring washer 24 is connected, grate 28 and the rigidity of powder column 26 it is larger in assembling process almost without deformation, therefore contact grate 28
The case where can regard the direct contact spring washer 24 of nozzle component 30, last 25 Contact Seal ring 29 of housing unit, by jet pipe group as
Contact situation rundown process of the part 30 with housing unit 25, spring washer 24 and sealing ring 29 is divided into 3 stages:
A) first stage: when just starting to tighten, solid mouse nozzle component 30 only has thread contact, and torque need to only overcome
Screw thread pair connects generated friction torque, and the torque value in this stage is smaller and is basically unchanged；
B) second stage: solid mouse nozzle component 30 is connected through a screw thread relative rotation and arrives contact spring washer 24,
Spring washer 24 deforms, and the axial force of threaded connection becomes larger.This stage solid mouse and spring washer 24 rub in the presence of sliding
It wipes, torque needs the torque for overcoming internal and external threads connection friction to generate and solid mouse nozzle component 30 to rub with spring washer 24
Wipe the torque generated.The torque value in this stage can be increased, and the amplitude of increase is related with 24 coefficient of elasticity of spring washer.
C) phase III: on the basis of second stage, solid mouse nozzle component 30 is contacted with sealing ring 29 again, close
29 flexible deformation of seal is threadedly coupled axial power and continues to increase.This stage solid mouse rubs with sealing ring 29 in the presence of sliding
It wipes, the torsion that torque needs the torque for overcoming internal and external threads connection friction to generate, solid mouse and the friction of spring washer 24 to generate
The torque that square and the friction of solid mouse and sealing ring 29 generate.The torque value in this stage continues to start to increase, and increases
Amplitude is related with 29 coefficient of elasticity of sealing ring.
In conclusion ideally, the size of torque loaded value contacted with sealing ring 29 with nozzle component 30, spring pad
The frictional resistance moment that circle 24 contacts with nozzle component 30, contacts generation between screw thread pair is related.
2) screw thread force analysis
Since nozzle component 30 and housing unit 25 matchs using screw thread, when apolegamy, requires assembly easily, and assembly
When in 30 screw thread of nozzle component and 25 screw thread of housing unit be coated with lubricating grease.According to engineering experience, 200Nm need to generally be added to twist
Tight solid mouse, only need 3~4Nm can rotable nozzle component 30, therefore the by-produced moment of resistance of screw thread is to loading moment
Influence very little, can ignore.Therefore, it can be deduced that draw a conclusion: nozzle component 30 rotates during solid mouse pre-tightens
When screw thread pair moment of resistance very little, and very stable, torque-angle curve is essentially straight line, slope of a curve zero, and base
This is constant.
3) 24 force analysis of spring washer
Spring washer 24 can generate compressive deformation in the case of by normal pressure.In solid mouse assembling process, nozzle component
30 with 24 contact site of spring washer (practical is nozzle component 30 and 28 contact site of grate) be annular surface, nozzle component 30
When tightening, normal pressure F that spring washer 24 is acted on by nozzle component 301It is acted on circumferentially distributed frictional force, wherein normal pressure F1
Spring washer 24 is caused to compress, circumferentially distributed frictional force shows as contact frictional resistance square M2, 24 force analysis of spring washer is shown in
Fig. 6.24 deflection of spring washer and normal pressure have relationship, then are had according to Hooke's law:
F1=k1·m (1)
Wherein, F1Normal pressure suffered by-spring washer, deflection of the m-spring washer on positive pressure direction, k1—
Coefficient of elasticity.
In order to find out 24 deflection of spring washer and normal pressure universal relation, certain typical solid mouse of factory is selected to make
It is tested for subjects.Pressure testing is carried out to spring washer 24 using pressure-strain equipment, obtains its pressure-change
Shape amount curve is shown in Fig. 7.
As seen from Figure 7, which can be close within the scope of decrement
Seemingly regard as and be made of 4 sections of sectional curves, the deflection section of 4 sections of curves is respectively [0,0.5], [0.5,2.8], [2.8,3.15]
[3.15,3.9].
By solid mouse design code, decrement should be controlled in [0.5~2.5] mm after spring washer 24 assembles.It is right
The built-in part of the solid mouse carries out dimension chain conversion, calculate it is pressed in design requirement tolerance dimension range inner spring washer 24
Contracting amount is within the scope of [0.6~2.5] mm.
It can be seen from figure 7 that curve in [0.5~2.8] decrement section can approximation regard straight line as, then spring pad
Enclose 24 coefficient of elasticity [0.5~2.8] can approximate calculation obtain:
k1=0.44kN/mm (2)
After nozzle component 30 is tightened in place, 24 deflection of solid mouse spring washer and normal pressure relationship are as follows:
F1=0.44m (3)
Factory's 24 materials of solid mouse spring washer are identical with structure, according to select various sizes of spring washer 24 into
Row test, pressure-deformation amount curve shape are identical as the 24 pressure-deformation amount curve shape of solid mouse spring washer.
Therefore, it can be deduced that draw a conclusion: solid mouse spring washer 24 pressure-deformation amount curve is an oblique line, and oblique line
Slope is constant, and slope value is greater than 0.Torque-angle curve tendency is identical as pressure-deformation amount curve tendency during loading.
4) 29 force analysis of sealing ring
In solid mouse assembling process, sealing ring 29 and 30 contact site of nozzle component are similarly annular surface, sealing ring
The 29 normal pressure F acted on by nozzle component 302It is acted on circumferentially distributed frictional force, wherein normal pressure F2Sealing ring 29 is caused to press
Contracting, circumferentially distributed frictional force show as contact frictional resistance square M3, 24 force analysis of sealing ring is shown in Fig. 8.
Sealing ring decrement and normal pressure relationship are analyzed.29 body structures of sealing ring are physical plane annulus,
Axial compressive force F is constrained without circumferential2In the case where being uniformly distributed effect, from the mechanics of materials:
By formula (4)~(6) it can be concluded that,
F=ε EA (7)
Wherein, E-elasticity modulus only depends on that this body structure of materials and temperature and other conditions are unrelated；σ-stress；ε—
Strain；L-length；Δ L-length variable quantity.
Sealing ring 29 can be regarded to a spring in this case as, if its coefficient of elasticity is k2(29 material structure of sealing ring
In the certain situation of size, k2For constant), by Hooke's law it is found that
But in fact, sealing ring 29 assembles in compression process, compressive deformation process is circumferential by 30 annular of nozzle component
The constraint of groove theoretically will cause the change of material property, if density is with the amount of compression increases and increases, 29 elasticity system of sealing ring
Number is likely to be the variable changed with decrement.
If deflection of the spring washer 24 on positive pressure direction is n, coefficient of elasticity k2, then according to Hooke's law
Have:
F2=k2·n (9)
K herein2Not constant, is sensu lato coefficient of elasticity, and value is possible to the variation with n and changes.
29 decrement of practical set situation lower seal and normal pressure universal relation in order to obtain select factory's typical solid
Mouse GF-10 is tested as subjects.Pressure examination is carried out to GF-10 sealing ring 29 using pressure-strain equipment
It tests, show that its pressure-decrement curve is shown in Fig. 9.
From fig. 9, it can be seen that 29 pressure of GF-10 sealing ring-decrement curve can be regarded as within the scope of its decrement by 2 sections
Sectional curve is constituted, and it is curve that decrement is interior in [0,0.2] range, interior [0.2~0.9] range is that approximation regards straight line as.
By GF-10 solid mouse design code, decrement requires control in (0.15~0.45) after sealing ring 29 assembles
In mm.
By curve it can be calculated that (0.15~2.9] in range:
k1=12.85kN/mm (10)
After nozzle component 30 is tightened in place, if 29 decrement of sealing ring is n, then 29 decrement of GF-10 sealing ring and positive pressure
Power relationship are as follows:
F2=12.85n (11)
29 material of factory's solid mouse sealing ring, structure are identical with assembly compression situation, various sizes of according to selecting
Sealing ring 29 is tested, and pressure-deformation amount curve shape is identical as 29 pressure-deformation amount curve shape of GF-10 sealing ring.
Therefore, it can be deduced that draw a conclusion: 29 pressure-deformation amount curve of solid mouse sealing ring is by 1 curve and 1 straight line structure
At the slope of curved section increases with the increase of 29 decrement of sealing ring.
5) comprehensive force analysis
Such analysis obtain influence solid mouse torque load because being known as between nozzle component 30 and housing unit 25
Screw thread, spring washer 24 and sealing ring 29 etc., the influence of screw thread can be ignored due to relatively weak；Selected solid mouse
In 29 pressure of spring washer 24 and sealing ring-decrement test result, within the scope of design requirement decrement, 24 He of spring washer
29 initial compression phase coefficient of elasticity of sealing ring is smaller, increases, the small coefficient area of spring washer 24 with the increase of decrement
Between length be about 0.5mm, the small coefficient siding-to-siding block length of sealing ring 29 is about 0.08mm, 24 coefficient of elasticity k of spring washer1It is maximum
Value is 0.44kN/mm, 29 coefficient of elasticity k of sealing ring2Maximum value is 12.85kN/mm, it can be seen that its 29 elasticity system of sealing ring
Number is much larger than 24 coefficient of elasticity of spring washer, reaches nearly 30 times.Therefore the screw-down torque shadow in 24 pairs of spring washer assembly rundown process
Very little is rung, screw thread and spring washer 24 can be ignored in the rundown process phase III, 29 decrement of sealing ring is determined correctly
The influence of property.
6) torque-corner ideal curve
According to above-mentioned analysis and 29 decrement of sealing ring and screw-down torque theory relation are combined, it is ideal to draw torque-corner
Curve, curve tendency should be such as Fig. 4.
A) A point is to B point: solid mouse nozzle component 30 and housing unit 25 in rundown process only have thread contact,
With the increase of corner, torque is held essentially constant；
B) B point is to C point: the contact spring washer 24 in rundown process of nozzle component 30, spring washer 24 deform, and screw thread connects
The axial force connect becomes larger, and is gradually increased torque, and 24 coefficient of elasticity of spring washer is smaller, and torque gradient is smaller；
C) C point is to D point: Contact Seal ring 29 in rundown process of nozzle component 30, sealing ring 29 deform, threaded connection
Axial force continues to become larger, and increases torque, larger compared to 24 sealing ring of spring washer, 29 coefficient of elasticity, and torque gradient increases；
D) D point is to E point: sealing ring 29 is compressed to limiting condition, and corner is constant, and torque quickly becomes larger.
From fig. 4, it can be seen that C point to D point be 29 compression process curve of sealing ring.Due to every kind of solid mouse screw thread,
Difference between spring washer 24, sealing ring 29, loading procedure end point can directly be read by torque-angular transducer, but
Its CD sections of starting point is difficult to grasp, and need to be realized by algorithm, by analyzing torque-angle ideal curve.
7) C point angle value-acquiring method
According to the slope of curve feature, CD sections of starting point angle values are obtained using the mode of mathematical computations, by right
The slope of curve that acquired data are formed carries out Continuous plus, and the section that selection slope variation rate continuously enlarges is as sealing ring 29
Start the section where the starting point of compression, reads this angle value An.Method is specific as follows:
A) it obtains and records solid mouse parameter [MIt protects,MIf, P, t, d], wherein MIt protectsTo protect torque, MIfFor design requirement
Torque value, and
MIt protects=MIf× 120% (12)
P is 25 thread pitch of nozzle component 30 and housing unit, and t is sealing ring thickness value, and d is sealing ring decrement, △ A
For twisting angle, wherein
△ A=Am- An (13)
Wherein AmThe angle value that nozzle component turns at the end of for load, AnTo start jet pipe when sealing ring starts compression
Component turns over angle value, passes through formula
D=(△ A × P)/(360 × t) (14)
Calculate to obtain sealing ring decrement.
B) the built-in part of solid mouse is first packed into housing unit 25,1 sealing ring 29 is then packed into nozzle component
30, nozzle component 30 is screwed into housing unit 25 with hand and is pre-installed；
C) housing unit 25 is fixed, it is able to rotate it not, torque spanner 34 drives nozzle component 30 to carry out torque load,
Record torque value M in loading procedure in real time at regular intervalsnAnd angle value An, and slope K value is calculated in real time,
Kn=(Mn+1-Mn)/(An+1-An) (15)
Wherein n is that the point on torque-angle curve uses continuous 7 since first point on torque-angle curve
Totally 6 sections of curves are one group to point, successively carry out the calculating of slope difference, toward one point of pusher as new one group after every group of calculating,
It is carried out continuously the calculating of slope difference, i.e.,
△Kn-1=Kn- Kn-1 (16)
As △ Kn-1< △ Kn< △ Kn+1< △ Kn+2< △ Kn+3When, i.e., slope rate continuity starts to increase, then records at this time
AnValue, starts at this time from AnIt calculates sealing ring and compresses magnitude；
8) algorithm of decrement is obtained
In above-mentioned acquisition AnOn the basis of, continue to load nozzle component 30, reach any a kind of situation in following two situation,
Load stops:
A) it is loaded onto default protection torque MIt protectsBefore, it constantly calculates, meets default compression ratio η until being loaded ontoSetting,
In 10%≤ηSetting≤ 30%, i.e. ηIt is practical=ηSetting, load stops at this time, records ηIt is practicalValue, decrement d value and torque value MIn real time；
B) it is loaded onto default decrement ratio ηSettingBefore, torque value is loaded onto protection torque MIt protects, i.e. MIn real time=MIt protects, load at this time
Stop, the angle value A that nozzle component turns at the end of record loadmValue, calculates compression magnitude according to formula (13) and (14)
D, then calculate compression ratio, i.e.,
ηIt is practical=(d/t) × 100% (17)
And judge compression ratio ηIt is practicalWhether meet
10%≤ηIt is practical≤ 30% (18)
If satisfied, then recording ηIt is practicalValue, decrement d value and torque value MIn real time, if not satisfied, then loading stopping, re-replacing
Sequentially 7a again after sealing ring)~7c) it reloads.
It chooses certain solid mouse in this way to be tested, screw pitch 1.5mm, sealing ring thickness 1mm, shell group
25 outer diameter of part is Φ 120mm, sets MIt protectsFor 240Nm, decrement 0.2mm, experimental result is shown in Table 1.It can by test result
, the compression magnitude and manual measurement value difference obtained using the method for the present invention measurement can be good at obtaining in engineering away from very little
Theory support is provided to utilization, while for the automation of solid mouse sealing ring decrement acquisition.
1 verification test result of table
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (1)
1. a kind of solid mouse torque loading procedure sealing ring decrement online test method, it is characterised in that steps are as follows:
1) first paper tape (35) equal with the nozzle component of rocket (30) perimeter is divided into 360 parts, and is affixed on nozzle component
(30) oral area, each scale represent 1 ° of angle value；The second paper tape (36) of only straight line label is affixed on shell simultaneously
The oral area of component (25)；The nozzle component (30) is directly connected through a screw thread with housing unit (25), and is used for sealing ring
(29) it is sealed；
2) when nozzle component (30) and housing unit (25) load, housing unit (25) are fixed, it is right using torque spanner (34)
Nozzle component (30) loads torque；When load, torque spanner (34) scale since 1Nm, records housing unit at this time
(25) corresponding nozzle component (30) the first paper tape of label (35) scale value of the second paper tape of institute's labelling (36), is denoted as 0 °, then often
Increase torque every 1Nm, corresponding angle value makes torque-until loading completion after recording each torque value load
Angle curve figure；
3) M is obtainedIt protects、MIf, P, t value, wherein MIt protectsTo protect torque value, MIfFor design requirement torque value, and MIt protects=MIf×
120%, P are nozzle component (30) and housing unit (25) thread pitch, and t is sealing ring (29) thickness value；
4) η is setSettingFor sealing ring (29) expected compression ratio, ηIt is practicalTo test sealing ring (29) compression ratio obtained, and meet
ηIt is practical≤ηSetting, 10%≤ηSetting≤ 30%, ηIt is practical=(d/t) × 100%, sealing ring (29) decrement d=(△ A × P)/360；From
Contact Seal ring (29) starts the twisting angle △ A=A terminated to loadm- An, wherein AmNozzle component at the end of for load
(30) angle value turned over, AnThe angle value that nozzle component turns over when starting compression for sealing ring；
5) pass through formula Kn=(Mn+1-Mn)/(An+1-An), wherein M represents torque value, and A represents angle value, and footmark n is torque-angle
The coordinate points write music on line, K is torque-angle curve slope value, since first point on torque-angle curve, is used
Totally 6 sections of curves are one group to continuous 7 points, successively carry out the calculating of slope difference, every group of calculating is later toward one point of pusher as new
One group, meet △ K when a certain groupn-1< △ Kn< △ Kn+1< △ Kn+2< △ Kn+3When, wherein △ Kn-1=Kn- Kn-1, i.e., tiltedly
Rate continuously starts to increase, then records A at this timenValue；
6) continue to load nozzle component (30), continuously to ηIt is practicalIt is calculated, reaches any a kind of situation in following two situation, add
It carries and stops, and record the angle value A that turns over of nozzle component (30) at the end of loadm, and calculate and obtain decrement d value；
A) it is loaded onto default protection torque MIt protectsBefore, the default compression ratio of satisfaction, i.e. η are loaded ontoIt is practical=ηSetting；
B) it is loaded onto default decrement ratio ηSettingBefore, torque value is loaded onto protection torque MIt protects, i.e. MIn real time=MIt protects。
Priority Applications (1)
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| CN107617852B (en) * | 2017-09-29 | 2019-04-30 | 四川航天川南火工技术有限公司 | A kind of Miniature solid rocket automatic loading method and device based on decrement control |
| CN107953999A (en) * | 2017-12-25 | 2018-04-24 | 襄阳宏伟航空器有限责任公司 | It is a kind of to penetrate umbrella rocket means for the quick parachute-opening of parachute |
| CN109100244B (en) * | 2018-07-26 | 2020-12-18 | 中国航空工业集团公司沈阳飞机设计研究所 | Parameter selection test method for torsion spring for airplane |
| CN109271660B (en) * | 2018-07-31 | 2023-08-11 | 上海空间推进研究所 | Reliability evaluation method for movable connection structure of rocket engine spray pipe |
| CN112984025B (en) * | 2019-12-12 | 2023-02-28 | 中车唐山机车车辆有限公司 | Damper assembly control method, damper assembly control device, and storage medium |
| CN112763339B (en) * | 2020-12-24 | 2023-07-25 | 中国兵器工业第五九研究所 | Online measuring method and system for load of elastic piece |
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