CN106438657A - Thread pitch interference fit thread, threaded connector and corrected thread machining tool - Google Patents
Thread pitch interference fit thread, threaded connector and corrected thread machining tool Download PDFInfo
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- CN106438657A CN106438657A CN201611113645.1A CN201611113645A CN106438657A CN 106438657 A CN106438657 A CN 106438657A CN 201611113645 A CN201611113645 A CN 201611113645A CN 106438657 A CN106438657 A CN 106438657A
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- screw thread
- female thread
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- 238000012937 correction Methods 0.000 claims description 56
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Classifications
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- 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- 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
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
Abstract
The invention provides a thread pitch interference fit thread, a threaded connector and a corrected thread machining tool and belongs to the technical field of mechanical connection. The thread pitch interference fit thread comprises an outer thread and an inner thread matched with each other. The original triangular parameters of the outer thread or/and the inner thread are changed, so that the outer thread and the inner thread which are matched with each other have a thread pitch difference, and the thread pitch of the outer thread is 95-99% of that of the inner thread; or the thread pitch of the inner thread is 95-99% of that of the outer thread. According to the thread pitch interference fit thread, loads are uniformly distributed for threaded connection in a screwing length range, so that the connecting strength of the thread is improved; according to the thread pitch interference fit thread, a required stable locking torque can be obtained between the inner thread and the outer thread under the circumstance of no axial loads, so that the self-locking problem of the threaded connector is effectively solved; the additional torque for fastening the thread is not increased by virtue of an anti-loosing locking torque formed by the thread pitch interference fit thread.
Description
Technical field
The present invention relates to MACHINERY JOINT field, in particular to a kind of pitch interference fit screw thread, threaded
Part and correction screwing tool.
Background technology
Threaded is to apply connected mode the most universal in the world, and screw thread is that the most familiar of frame for movement of people will
Element, either space flight, aviation, atomic energy, industrial machine, electronic product, transportation, textile machine and the articles for daily use do not have
Which can leave threaded.But there are two big technical barriers in threaded technical field and annoying numerous mechanics
Cheng expert, one is threaded intensity, is mainly reflected in screw at work due to being acted on by alternate load, is generally leaning on
There is the problem of fracture at nearly female thread supporting surface；Another is the lock between the internal and external threads part working under vibrating conditions
Tight problem.
Content of the invention
It is an object of the invention to provide a kind of pitch interference fit screw thread, to improve the thread connecting mode of prior art
Bonding strength is low and problem of poor in self under vibrating conditions.
It is an object of the invention to provide a kind of threaded connector, connected strong with the thread connecting mode improving prior art
Spend low and poor in self under vibrating conditions problem.
It is an object of the invention to provide a kind of revise screwing tool, to improve the thread connecting mode of prior art
Bonding strength is low and problem of poor in self under vibrating conditions.
Embodiments of the invention are realized in：
Based on above-mentioned first purpose, the invention provides a kind of pitch interference fit screw thread is it is characterised in that include mutually
The external screw thread of cooperation and female thread, change described external screw thread or the original triangle parameter of described female thread makes phase
Mutually the described external screw thread of cooperation and described female thread has pitch difference, and wherein, described externally threaded pitch is described interior spiral shell
The 95%-99% of the pitch of stricture of vagina；Or the 95%-99% that the pitch of described female thread is described externally threaded pitch.
In preferred embodiments of the present invention, described female thread is metric system standard thread, the repairing of described externally threaded pitch
Positive quantity is 0.01-0.05, and wherein, it is exhausted with the difference of the pitch of described female thread that described correction is described externally threaded pitch
Ratio to value and the pitch of described female thread.
In preferred embodiments of the present invention, described external screw thread is metric system standard thread, the repairing of the pitch of described female thread
Positive quantity is 0.01-0.05, and wherein, it is exhausted with the difference of the pitch of described female thread that described correction is described externally threaded pitch
Ratio to value and described externally threaded pitch.
In preferred embodiments of the present invention, described female thread is British standard thread, the repairing of described externally threaded pitch
Positive quantity is 0.01-0.05, and wherein, it is exhausted with the difference of the pitch of described female thread that described correction is described externally threaded pitch
Ratio to value and the pitch of described female thread.
In preferred embodiments of the present invention, described external screw thread is British standard thread, the repairing of the pitch of described female thread
Positive quantity is 0.01-0.05, and wherein, it is exhausted with the difference of the pitch of described female thread that described correction is described externally threaded pitch
Ratio to value and the pitch of described female thread.
In preferred embodiments of the present invention, the thread form angle of described external screw thread or described female thread is 60 degree.
Based on above-mentioned second purpose, the invention provides a kind of threaded connector, including the external screw thread cooperating and
Female thread, the original triangle parameter of the described external screw thread of change or described female thread makes the described outer spiral shell cooperating
Stricture of vagina and the pitch of described female thread, described externally threaded pitch is the 95%-99% of the pitch of described female thread；Or
The pitch of female thread described in person is the 95%-99% of described externally threaded pitch.
Based on above-mentioned 3rd purpose, the invention provides a kind of revise screwing tool, including correction forming internal threads
Portion, the pitch in described correction forming internal threads portion is 0.95P-0.99P, and wherein, P is matched with described correction female thread
Externally threaded standard pitch.
In preferred embodiments of the present invention, also include revising external screw thread forming part, described correction external screw thread forming part
Pitch is 0.95P-0.99P, and wherein, P is and the described standard pitch revising the female thread that external screw thread matches.
In preferred embodiments of the present invention, described correction screwing tool can be screw tap, cylindrical die roll, screw plate and
One of screw die.
The beneficial effect of the embodiment of the present invention is：
In sum, embodiments provide a kind of pitch interference fit screw thread, by common threaded middle phase
Mutually the tooth form of one of internal and external screw thread of cooperation screw thread is modified, and obtains one group of new screw thread having axial interference fit
Matching relationship, this screw thread is by the adjustment to screw thread original triangle, changes one of internal and external threads cooperating
The pitch dimension of screw thread, makes screw thread produce axial interference by pitch difference in the range of screwing length.Here internal and external threads pitch
The screw thread that difference cooperates is referred to as pitch interference fit screw thread, claims pitch to repair on the screw thread that pitch dimension have adjusted therein
Plus thread.In pitch interference fit screw thread, if wherein external screw thread is standard thread, the female thread matching must be that pitch increases
Pitch correction screw thread that is big or reducing；If wherein female thread is standard thread, the external screw thread matching must be that pitch increases
Or the pitch correction screw thread reducing.The thread form angle of pitch correction screw thread is identical with the thread form angle of standard thread, only pitch is done micro-
Amount adjustment, general adjustment amount is one of percentage of pitch dimension to 5 percent.Pitch interference fit screw thread makes threaded connector
Present new great good characteristic：
A, pitch interference fit screw thread make to be threaded in screwing length scope internal load and are evenly distributed, and improve screw thread
Bonding strength；
B, pitch interference fit screw thread make to obtain in the case of not having axial load between internal and external threads required steady
Fixed locking torque, effectively solves the problems, such as threaded connector self-locking；
The anti-loosening locking moment that C, pitch interference fit screw thread are formed does not increase the additional torque that screw thread tightens.
Pitch interference fit screw thread under conditions of screwing length is certain, by adjusting the female thread that cooperates and outer spiral shell
The method of the difference between stricture of vagina pitch reaches optimum performance and requires.Wherein, screwing length refers to two screw thread edges cooperating
Axis of thread direction mutually screws the length of part.
The threaded connector that the present embodiment provides, has all advantages of above-mentioned pitch interference fit screw thread.
The correction screwing tool that the present embodiment provides, processes the female thread cooperating obtaining and external screw thread has
All advantages of the above-mentioned interference fit screw thread that is spirally connected.
Brief description
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be attached to use required in embodiment
Figure is briefly described it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the schematic diagram of the pitch interference fit screw thread of the embodiment of the present invention；
Fig. 2 is the schematic diagram of threaded fastener use state；
Fig. 3 is the structural representation of the pitch interference fit screw thread of the embodiment of the present invention.
Icon：Female thread 100；External screw thread 200.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.The present invention generally described and illustrated in accompanying drawing herein is implemented
The assembly of example can be arranged with various different configurations and design.
Therefore, below the detailed description of the embodiments of the invention providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of not making creative work, broadly falls into the model of present invention protection
Enclose.
It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then do not need it to be defined further and explains in subsequent accompanying drawing.
In describing the invention, it should be noted that the orientation of instruction such as term " outward " or position relationship are based on attached
Orientation shown in figure or position relationship, or the orientation usually put or position relationship when this invention product uses, be only for
It is easy to describe the present invention and simplifies description, rather than the device of instruction or hint indication or element must have a specific side
Position, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
In describing the invention in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ",
" installation ", " being connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or one
Body ground connects；Can be to be mechanically connected or electrically connect；Can be joined directly together it is also possible to by intermediary indirect
It is connected, can be the connection of two element internals.For the ordinary skill in the art, can be with concrete condition understanding
State term concrete meaning in the present invention.
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combine.
Pitch interference fit screw thread embodiment
The metric system standard thread being related in the present embodiment is with reference to GB00196-2003 regular screw threads standard.Refer to Fig. 1
And Fig. 3, show in Fig. 3 that female thread 100 is the screw thread increasing pitch, external screw thread 200 is the schematic diagram of standard thread, its
In, H is the height of externally threaded original triangle, and H1 is the height of the original triangle of female thread；P is externally threaded pitch, and P1 is
The pitch of female thread；D1 is diameter of thread, and d2 is the pitch diameter of thread, and d is Major Diam；M is maximum axial interference.The present invention provides
A kind of pitch interference thread structure, including the external screw thread 200 cooperating and female thread 100, described externally threaded ridge
Type is triangle, and the form of thread of described female thread is triangle；Described externally threaded thread form angle and the tooth form of described female thread
Angle is equal；Described externally threaded original triangle is equilateral triangle, and the original triangle of described female thread is equilateral triangle,
And the length of side of original triangle of described female thread is unequal with the length of side of described externally threaded original triangle；
Described externally threaded pitch is the 95%-99% of the pitch of described female thread；Or the pitch of described female thread is
The 95%-99% of described externally threaded pitch.
The basic parameter of form of thread and screw thread each portion size are all to be determined by the original triangle of form of thread, commonly
The original triangle of screw thread is the equilateral triangle that the length of side is equal to pitch.Pitch interference thread is the inside and outside spiral shell that a pair of matched is closed
The length of side of one of stricture of vagina form of thread original triangle is revised (increase or reduce), and another keep constant so that it may
To obtain required axial interference in the range of the screwing length of screw thread.After the pitch of internal and external threads changes, inside and outside in order to meet
Screw thread can use cooperatively, and the knots modification of the pitch of internal and external threads needs within the specific limits, therefore, sets two cooperating
The pitch of individual screw thread is respectively P1 and P2, then the relation of P1 and P2 is：P1=(0.95-0.99) P2, the pitch of female thread 100
The pitch of external screw thread 200 can be more than, the pitch of female thread 100 can be less than the pitch of external screw thread 200, as long as meeting above-mentioned
Pitch relation.
The embodiment of the present invention propose screw thread axial direction interference fit new ideas, by micro adjustment female thread 100 or
The pitch of external screw thread 200 so that the pitch of two female threads cooperating 100 and external screw thread 200, by internal and external screw thread
Pitch official post screw thread produce axial interference in the range of screwing length, this pitch difference produces the screw thread of axial interference fit
It is exactly pitch interference fit screw thread, claim pitch correction screw thread the screw thread being formed after fine setting pitch.
At present, there are two big technical barriers in threaded technical field and annoying vast mechanical engineering expert, one
It is threaded intensity, is mainly reflected in screw at work due to being acted on by alternate load, generally propping up near female thread
There is the problem of fracture in support face place.Another is the locking problem between the internal and external threads part working under vibrating conditions.
A. with regard to threaded intensity to topic：
Refer to Fig. 2, in frame for movement, each parts majority is by threaded fastener, they to be fixed together
, each threaded fastener finally will be loaded by the internal and external threads cooperating, and bears whole load.Thread part is turned round
After tight, load is interacted by internal and external threads, and correlated parts are clamped by the support end face through inner thread part, although inside and outside
Multiple threads are had in the range of the screwing length of screw thread, but because the rigidity of material hinders the transmission of power, in length of thread engagement
Screw thread stress very uneven.Under Axial Loads, first ridge near inner thread part supporting surface is subject to first
Power, axial force could pass to second thread the power of remainder, by that analogy after making first ridge deformation.Away from
The load that at female thread support end, screw thread is subject to is less and less, if screwing length is long, finally several away from female thread support end
Individual ridge no longer stress.General threaded in 70% load all concentrate near female thread support end first
On the second two ridges.
The inhomogeneities that screw thread is distributed in screwing length scope internal load, the threaded intensity of serious impact, this is just
It is generally to occur the reason buckle at screw thread near female thread support end the one the second in the fracture of screw in frame for movement, be generation
A unsolved big technical barrier for a long time in boundary.
B. lock problem with regard to thread part：
Generally in the case of static load, screw thread is subject to responsive to axial force, and the frictional force producing between internal and external threads tooth surface is more than axle
The tangential component producing in lead angle direction to power is that is to say, that regular screw threads (including coarse thread, fine thread) are in static load feelings
Under condition, the frictional force between screw thread can play self-locking action, and this is the auto-lock function of screw thread itself.In the quiescent state, turned round
Due to the effect of axial load, all there is very big friction between the surface of internal and external threads and correlated parts in tight threaded connector
Power, wanting the screw having tightened to unclamp must be with twisting with the moment being close when tightening.But carry under vibrating conditions
Lotus is to change, and moment axial load may be close to zero, and the frictional force between screw thread and correlated parts is little therewith or disappears, and shakes
The dynamic frictional force inertia force moment that part produces being more than between screw thread and correlated parts, screw connection structure will loosen,
Once generation thread looseness, the fastening effect of screw thread just lost efficacy rapidly and mechanical breakdown occurred.For solving threaded connector locking
Problem, domestic and international expert did many effort, on connecting-piece structure with increase spring pad, Corrugation pad, dentiform gasket, split pin,
Locking silk etc., has various self-locking nuts on design of part, such as nylon ring self-locking, fluting self-locking, closing in self-locking, filler self-locking
Deng also changing helicitic texture, but effect be all undesirable.Not only complex structure high cost, and unstable properties lost efficacy soon.
The self-locking problem of screw thread be threaded in another technical barrier.
It is difficult that the pitch interference fit screw thread that the present embodiment provides effectively solves two threaded big world property technology
Topic：
A, pitch interference fit screw thread can make length of thread engagement scope internal load be evenly distributed, and improve threaded strong
Degree, solves the problems, such as that screw thread ruptures at female thread supporting surface：
Threaded with pitch interference fit, when internal and external threads also all do not screw, due to few, the spiral shell that screws button number
Not yet all compensate the fit clearance of the internal and external threads that the factors such as the manufacturing tolerance by screw thread cause away from difference, internal and external threads can be light
Loose screws, when screwing to certain length, after between internal and external threads, the pitch difference of presence compensates whole Screw Thread Fit Clearance,
The two sides screwing the two ends ridge of part come into contact with, and continue to screw in, produce interference, force between the ridge of contact
Ridge elastic bending deflection, consequently also following contacts, so that producing interference, after screw thread all screws, are revolving close ridge
The ridge interference closing the two ends of length is maximum, gradually little to centre, due to there is Screw Thread Fit Clearance, in the middle of screwing length
Part ridge phase be not in contact with each other.Pitch interference fit screw thread when there is no axial load, the pitch official post spiral shell of internal and external threads
The internal and external threads at screwing length two ends for the stricture of vagina produce interference, form two active forces to mutual extruding.If the pitch of female thread
More than externally threaded pitch, in the two ends external screw thread Tensile of screwing length, female thread is compressed, the internal and external threads of mid portion
There is fit clearance not stressing.When continuing to tighten screw thread, producing axial tension makes correlated parts deform, and is supporting near female thread
Face end, the active force being produced by pitch difference is offset by rightabout pulling force, and pitch difference is all offset in the increasing with axial tension
After the active force producing, near female thread support end, the screw thread diastema that internal and external threads have gap one side is eliminated, and starts
Contact and bear axial force, increase with the increase of lashing force, the ridge at the middle part of screwing length is also mutually inherited
By responsive to axial force.Away from female thread supporting surface end, the active force that pitch difference produces exists, simultaneously because of ridge elasticity
The equidirectional axial force that displacement transfer comes makes it increase.Prop up near female thread because the active force that pitch interference produces reduces
The stress of support end ridge, increased the stress away from female thread support end ridge, so that ridge in the range of screwing length is subject to
Power is uniform.Pitch interference fit screw thread changes the stress of screw thread each ridge in the range of screwing length, in screw thread rotation
Close length female thread uniform force, so that the intensity of threaded connector is greatly improved, solve screw and propping up near female thread
A skill wood difficult problem for support face end fracture.
B, pitch interference fit screw thread are preferable locking screws, and structure is the simplest, and cost is minimum, stable and reliable for performance：
After the internal and external threads of pitch interference fit screw thread all screw, the pitch official post screwing length two ends of internal and external threads
Axial interference is produced, the axial interference between internal and external threads makes to produce between these ridge side helical surface and rubs between multiple ridges
Wiping power, these frictional force just constitute the locking torque of pitch interference fit screw thread.
The locking torque of pitch interference fit screw thread depends on size, the maximum of pitch difference and the screwing length of pitch difference
The interior number of threads is relevant, and in screwing length, the maximum axial magnitude of interference is：
Σ Δ Ρ=Δ Ρ χ Ν
Σ Δ Ρ --- total axial magnitude of interference in the range of screwing length, that is, tire out pitch difference；
Δ Ρ --- single pitch difference；
Ν --- the number of threads in the range of screwing length；
Because the processing of internal and external threads all has error, and the error of pitch itself and Half angle errors will the pitch diameters of thread
To compensate, between internal and external threads, to certainly exist certain fit clearance, given pitch difference will first compensate the fit clearance of screw thread
After could form interference between ridge, therefore, at the middle part of screwing length, between screw thread, have gap, gradually disappear to two side clearances
Except forming interference, maximum in the interference of screwing length two ends, therefore, the frictional force of locking is primarily generated at the two ends of screwing length.
When the internal and external threads of pitch interference fit are mutually torqued into, start to be insufficient to compensate between screw thread cooperation due to pitch difference
Gap, can easily be screwed into most (about 2/3rds), subsequently produce interference and need to be torqued into it completely with wrench and screw.
The locking torque of pitch interference fit screw thread is that the interference at screwing length two ends for the internal and external threads pitch difference produces,
As long as the pitch of one of female thread or external screw thread screw thread being increased or is reduced and can obtaining required coupling mechanism force, general feelings
Realized using the method increasing female thread pitch under condition.Because female thread is all processed with screw tap, as long as changing screw tap
Pitch just permissible.The pitch of screw-tap threaded can press the precision adjustment of micron, and the adjustment to locking torque is also just very accurate,
Implement very convenient simple.
The locking torque not only stability and durability of pitch interference fit screw thread, does not also increase the additional force that thread part tightens
Square, because the locking torque that thread part tightens the generation of pitch interference to a certain extent disappears, only tightens between internal and external threads
Axle power and for reaching the torsion that this axle power is applied, this is that other locking mechanisms cannot be accomplished.Pitch interference fit screw thread
It is that structure is the simplest, the most reliable locking mode of performance.
In the present embodiment, the design principle of pitch interference fit screw thread is as follows：
Refer to Fig. 3, the basic parameter of form of thread and screw thread each portion size are true by the theoretical triangle of form of thread
Fixed, form of thread theory triangle is the equilateral triangle that the length of side is equal to pitch.For determining in pitch interference fit screw thread
The dimensional parameters of pitch correction screw thread, do the theoretical triangle of one group of standard thread, first the pitch that have selected pitch dimension
The lower summit on the lower summit of theoretical triangle and standard thread theory triangle of revising screw thread is placed on same straight line, and will
Under one theoretical triangle of the lower summit of one of the theoretical triangle of pitch correction screw thread triangle and standard thread
Summit overlaps, then by remaining theoretical triangle of pitch interference thread and standard thread successively to arranged on both sides, constitutes Fig. 3 institute
Relation between the internal and external threads theory triangle of the pitch interference fit shown.
Fig. 3 is to be pitch correction screw thread by female thread, and external screw thread is standard thread, and female thread pitch is more than external screw thread spiral shell
Relational design away from (Δ P=P2P1).This two that the lower summit of this two groups of threading theoretical triangle intermediate cam shapes is overlapped
Theoretical triangle claims " benchmark triangle ", claims " datum line " the straight line residing for summit under whole theory trianglees.Determine by Fig. 3
The theoretical triangle of pitch correction screw thread just can design each nominal diametrical dimension calculating pitch interference thread.
Δ P in Fig. 3 is the pitch correction of pitch interference thread, and P is the pitch of standard thread；Typically take Δ P=
(0.01～0.05) P, due to △ P very little, the impact to the H/4 determining diameter of thread and the H/8 determining Major Diam is negligible
Disregard, the path of pitch correction screw thread and the nominal dimension in big footpath can use and the path of standard thread and the nominal dimension phase in big footpath
With.
Pitch correction pitch diameter of thread size should be relevant with pitch, due to setting of taking that summit under theoretical triangle overlaps
Meter principle, during measurement pitch correction screw thread, using three pins with standard thread same diameter, aborning can be pitch correction
The central diameter size equivalent processes of pitch diameter of thread size and standard thread because this central diameter be not pitch correction screw thread true in
Footpath, claims central diameter corresponding with standard thread for pitch correction screw thread " the equivalent central diameter " of pitch correction screw thread.
The Δ P of the size of pitch interference fit thread locking torque and pitch correction screw thread, D2, screwing length and match
Standard thread in relevant through size, reasonable selection above-mentioned parameter just can obtain preferable performance.
The species of form of thread has multiple, for example：Triangle thread, trapezoidal thread, rectangular thread, circular thread.In reality
During the application of border, in the preferred version of the present embodiment, the form of thread of described female thread 100 is triangle, corresponding, described outer
The form of thread of screw thread 200 is triangle, and triangle thread applied range is mainly used in the connection between part, in triangle
The requirement of higher self-locking is needed, therefore, by the form of thread of the internal and external threads of this pitch interference thread when shape is threaded
It is processed as triangle, the self-locking performance of triangle thread connection can be substantially improved, lift it further and use space.External screw thread or
The thread form angle of person's female thread is effectively set to 60 degree it is clear that may not be 60 degree.
During reality processing, in order to meet the pitch of internal and external screw thread in a suitable difference range, by changing
The length of side of the original triangle of female thread 100 or change external screw thread 200 original triangle the length of side, screw thread basic
Parameter is determined according to original triangle, therefore, by the pitch after changing the length of side of original triangle and then being changed.
In the preferred version of this embodiment, described female thread is metric system standard thread, and the correction of described externally threaded pitch is
0.01-0.05, wherein, described correction be described externally threaded pitch with the absolute value of the difference of pitch of described female thread with
The ratio of the pitch of described female thread.Set：P is the pitch of the female thread of standard thread, and P0 is amended externally threaded spiral shell
Away from, then, and correction=| P0-P |/P.Female thread is designed as metric system standard thread it is not necessary to internal threads 100 carry out unnecessary
Processing, directly adopt standard thread, reduce use cost.During external screw thread 200 processing, its pitch can increase
0.01-0.05 it is also possible to reduce 0.01-0.05, flexible and changeable during processing, the external screw thread 200 after machining and female thread
Required axial interference can be obtained in the range of screwing length after 100 cooperations.It is preferably arranged to, the repairing of described external screw thread 200
Positive quantity is 0.03, is easy to the processing of external screw thread 200, and after external screw thread 200 machine-shaping, when using cooperatively with female thread 100, interior
Externally threaded self-locking property is higher, and bonding strength is more preferable.
In the preferred version of this embodiment, described external screw thread is metric system standard thread, the correction of the pitch of described female thread
Measure as 0.01-0.05, wherein, it is absolute with the difference of the pitch of described female thread that described correction is described externally threaded pitch
Value and the ratio of described externally threaded pitch.Set, P1 is the externally threaded pitch of standard thread, Pm is amended female thread
Pitch, then, and correction=| Pm-P1 |/P1.Do not need external screw thread 200 to carry out unnecessary processing, directly adopt standard spiral shell
Stricture of vagina, reduces use cost.During female thread 100 processing, its pitch can increase 0.01-0.05 it is also possible to reduce
0.01-0.05, flexible and changeable during processing, the female thread 100 after machining can screw length after coordinating with external screw thread 200
Required axial interference is obtained in the range of degree.It is preferably arranged to, the correction of described female thread 100 is 0.03, is easy to female thread
After 100 processing, and female thread 100 machine-shaping, when using cooperatively with external screw thread 200, the self-locking property of internal and external threads is higher,
Bonding strength is more preferable.
In the preferred version of this enforcement, described female thread 100 or described external screw thread 200 are single thread, screw thread
Convenient processing and manufacture, and itself coupling mechanism force single threaded is big, using pitch interference single thread performance more preferably, locking effect
Fruit is more preferably.External screw thread or female thread can also be chosen as British standard thread.
The pitch interference thread that the present embodiment provides, its applied range, for example：
A. self-locking nut
Self-locking nut species on our times is a lot, has the thin ring of nylon ring self-locking nut, termination to flatten self-locking nut, open
Groove closing in self-locking nut etc. is a lot, and these self-locking nut complex structures, processing difficulties, self-locking moment are difficult to be controlled, repeatedly assembles and disassembles
Moment decays quickly, and therefore, in engineering goods, self-locking nut could not be commonly used.The latching characteristics of pitch interference thread is
New world opened out-of-the-way by self-locking nut, as long as the female thread 100 of plain nut is processed into pitch correction screw thread, can not only be managed
The self-locking property thought can also improve the intensity of connector.The structure of pitch interference thread self-locking nut, profile and production technology with
Plain nut is the same.
B. the connection of double thread stud and body
Some engineering goods on machine case, one end of the stud of TBE (threaded both ends) need to be screwed in the screw of housing,
How stud to be fixed in screw an always difficult problem, just with certain moment, stud can be fixed using pitch correction screw thread
In screw.
C. the connection of screw-thread bush and body
Can also be used for screw-thread bush is fixed in screw using pitch interference thread latching characteristics.
D. plain edition steel-wire screw-socket is become lock type steel-wire screw-socket
There are many problems in existing lock type steel-wire screw-socket, affect its popularization and application, and plain edition steel-wire screw-socket is filled
Form the steel-wire screw-socket hole with self-locking in the screw of the pitch correction screw thread entering design, that is, increased the spiral shell of light metal material body
Hole strength is but also with reliable auto-lock function.
Threaded connector embodiment
Present embodiments provide a kind of threaded connector, including the external screw thread cooperating and female thread, change described
The original triangle parameter of external screw thread or described female thread makes the described external screw thread cooperating and described female thread
Pitch, described externally threaded pitch is the 95%-99% of the pitch of described female thread；Or the spiral shell of described female thread
Away from the 95%-99% for described externally threaded pitch, the connector being cooperated using the principle of pitch interference fit screw thread,
There are all advantages of pitch interference fit screw thread, here is not described in detail.During reality processing, by cooperate first
Screw thread and the second screw thread design are pitch interference fit screw thread, and the first screw thread can be standard thread, and the second screw thread is to revise spiral shell
Stricture of vagina, revises the spiral shell that screw thread can be that screw thread on regular screw threads securing member can also be on other components of machine threaded
Stricture of vagina.First screw thread can be chosen as external screw thread or female thread.
Revise screwing tool embodiment
Present embodiments provide a kind of correction screwing tool, including correction forming internal threads portion, spiral shell in described correction
The pitch of stricture of vagina forming part is 0.95P-0.99P, and wherein, P is the externally threaded standard pitch matching with described female thread；Aobvious
So, can also include revising external screw thread forming part, the pitch of described correction external screw thread forming part is 0.95P-0.99P, wherein, P
It is the standard pitch of the female thread matching with described external screw thread.Revising screwing tool can be to be individually used for processing to revise
Externally threaded instrument is revised in the instrument of female thread or independent processing, can also be that can either be used for processing revises outer spiral shell
Stricture of vagina, can be also used for processing the instrument revising female thread.
Further, revising screwing tool can be one of screw tap, cylindrical die roll, screw plate and screw die.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of pitch interference fit screw thread, it is characterised in that including external screw thread and the female thread cooperating, changes described
The original triangle parameter of external screw thread or described female thread makes the described external screw thread cooperating and described female thread
There is pitch difference, wherein, described externally threaded pitch is the 95%-99% of the pitch of described female thread；Or described interior spiral shell
The pitch of stricture of vagina is the 95%-99% of described externally threaded pitch.
2. pitch interference fit screw thread according to claim 1 is it is characterised in that described female thread is metric system standard spiral shell
Stricture of vagina, the correction of described externally threaded pitch is 0.01-0.05, and wherein, described correction is described externally threaded pitch and institute
State the ratio of the absolute value of difference of the pitch of female thread and the pitch of described female thread.
3. pitch interference fit screw thread according to claim 1 is it is characterised in that described external screw thread is metric system standard spiral shell
Stricture of vagina, the correction of the pitch of described female thread is 0.01-0.05, and wherein, described correction is described externally threaded pitch and institute
State the absolute value of difference of the pitch of female thread and the ratio of described externally threaded pitch.
4. pitch interference fit screw thread according to claim 1 is it is characterised in that described female thread is inch standard spiral shell
Stricture of vagina, the correction of described externally threaded pitch is 0.01-0.05, and wherein, described correction is described externally threaded pitch and institute
State the ratio of the absolute value of difference of the pitch of female thread and the pitch of described female thread.
5. pitch interference fit screw thread according to claim 1 is it is characterised in that described external screw thread is inch standard spiral shell
Stricture of vagina, the correction of the pitch of described female thread is 0.01-0.05, and wherein, described correction is described externally threaded pitch and institute
State the ratio of the absolute value of difference of the pitch of female thread and the pitch of described female thread.
6. the pitch interference fit screw thread according to any one of claim 1-5 it is characterised in that described external screw thread or/
It is 60 degree with the thread form angle of described female thread.
7. a kind of threaded connector, it is characterised in that including external screw thread and the female thread cooperating, changes described external screw thread
Or the original triangle parameter of described female thread makes the pitch of the described external screw thread cooperating and described female thread
, described externally threaded pitch is the 95%-99% of the pitch of described female thread；Or the pitch of described female thread is institute
State the 95%-99% of externally threaded pitch.
8. a kind of correction screwing tool is it is characterised in that include revising forming internal threads portion, described correction forming internal threads
The pitch in portion is 0.95P-0.99P, and wherein, P is to revise, with described, the externally threaded standard pitch that female thread matches.
9. according to claim 8 correction screwing tool it is characterised in that also include revise external screw thread forming part,
The described pitch revising external screw thread forming part is 0.95P-0.99P, and wherein, P is to revise, with described, the interior spiral shell that external screw thread matches
The standard pitch of stricture of vagina.
10. the correction screwing tool according to Claim 8 or described in 9 is it is characterised in that described correction screw thread process work
Tool can be one of screw tap, cylindrical die roll, screw plate and screw die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611113645.1A CN106438657A (en) | 2016-12-07 | 2016-12-07 | Thread pitch interference fit thread, threaded connector and corrected thread machining tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611113645.1A CN106438657A (en) | 2016-12-07 | 2016-12-07 | Thread pitch interference fit thread, threaded connector and corrected thread machining tool |
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| CN106438657A true CN106438657A (en) | 2017-02-22 |
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|---|---|---|---|
| CN201611113645.1A Pending CN106438657A (en) | 2016-12-07 | 2016-12-07 | Thread pitch interference fit thread, threaded connector and corrected thread machining tool |
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| CN108661995A (en) * | 2018-07-18 | 2018-10-16 | 中国船舶重工集团公司第七0三研究所 | A kind of decreasing worm-pitch screw connection structure |
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| CN111853023A (en) * | 2020-07-20 | 2020-10-30 | 中船动力研究院有限公司 | Thread design method and thread connection structure |
| CN116989147A (en) * | 2023-09-28 | 2023-11-03 | 科讯工业制造(深圳)有限公司 | Precise flow regulating valve and assembling method thereof |
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Application publication date: 20170222 |