CN100513000C - Processing tool of high strength bolt and processing method of the processing tool - Google Patents
Processing tool of high strength bolt and processing method of the processing tool Download PDFInfo
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- CN100513000C CN100513000C CNB2005100291953A CN200510029195A CN100513000C CN 100513000 C CN100513000 C CN 100513000C CN B2005100291953 A CNB2005100291953 A CN B2005100291953A CN 200510029195 A CN200510029195 A CN 200510029195A CN 100513000 C CN100513000 C CN 100513000C
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Abstract
The invention relates to a screw producer, which can eliminate the bolt breakage caused by concentrated stress at tooth bottom and tooth top of screw, to improve the anti-fatigue strength of bolt; and the arc tooth top can avoid mechanical hurt caused in rotation, assembly and surface treating, to overcome sharp discharge, to make the coat uniform at tooth top, without saw edge and coat drop, to improve corrosion resistance.
Description
Technical field
The present invention relates to the processing method of bolt machining tool and machining tool, relate in particular to the cylindrical die roll and the screw plate that can process high-strength bolt with dome round-bottom tooth profile and circular arc tooth root screw-thread ending, and the processing method of cylindrical die roll and screw plate.
Background technology
Characteristics such as screw thread is simple in structure in conjunction with having, dependable performance, handling ease, the standard component as bolt, nut one class has become general commodity especially, and it is a kind of threaded fastener of common grade.Development along with modern industrial technology, the connection of some important events such as war industry, space flight, high-speed rail transportation, high-speed magnetic suspension train, automobile, boats and ships, engineering machinery, power station power-equipment, bridge construction, steel construction, and even the connection of human skeleton's fracture, this permanent connection and fixing no longer is that the high-strength bolt institute that produces of conventional method is competent.Development is the special-shaped securing member of the high strength screw thread of technical grade more than 8.8 grades thereupon, on various important screw connection members, replaced extensive screw bolt and nut, the special-shaped securing member of this high strength screw thread is just becoming the basic industry of the suitability for industrialized production of novel development.
Developing rapidly of auto industry, the requirement of high-strength screw, bolt being born alternation, shock loading and fatigue resistance has also correspondingly improved, the screw that automobile industry is used, the performance rate of bolt have generally reached 8.8 grades, and (GB38-76 " bolt technical conditions " regulation, 8.8 grades mean that Tensile strength is 800N/mm
2, the minimum of a value of yield point is 80% of tensile strength, i.e. 640N/mm
2), 10.9 grades, have in addition reach 12.9 grades (hardness HB355-430), the material of high-strength screw, bolt adopts steel alloy more, as 40Cr, 35CrMo, 42CrMo etc.Owing to carry out after screw thread processing is arranged in modified heat treatment usually, therefore precision, hardness, wearability and the toughness etc. of threading tools such as cylindrical die roll, screw plate had higher requirement.Use the rolling whorl work piece of import threading tool at present in automobile industry is introduced projects, its thread tooth all is dome round bottom and circular arc tooth root screw-thread ending shape (seeing accompanying drawing 1).Be to use all as the screw thread on Audi, the car Santana constant velocity cardan joint transmission shaft, CKD wheel screw, HONDA125 engine cylinder bonnet bolt, valve inside adjustment screw etc. that such threading tool is rolling to form.
Raising along with auto manufacturing's technical merit, main engine plants more and more pay attention to the quality standard of automobile securing member, the production of automobile securing member more and more trends towards the requirement of air standard securing member, 8.8 the high-strength bolt that level is above, screw-thread ending require to consult and carry out U.S. H28MJ thread standard and GJB GJB52-85 have fundamentally overcome the phenomenon of last button fracture after the screw thread stand under load fatigue.The cylindrical die roll that this screw thread of the Japan OSG company system of will rolling over requires is referred to as RR type profile of tooth, the tooth root that to be thread portion buckle to polished rod or the middle footpath last 1-2 of bar is for more than or equal to the transition of 0.15011P circular arc tooth root, its purpose mainly is to reduce stress to concentrate, and improves fatigue resistance effectively.But the circular arc tooth root transition of the screw-thread ending of the cylindrical die roll of the said firm is to come grinding at random to realize that not only working (machining) efficiency is low by craft and according to operator's experience, and machining accuracy also is difficult to guarantee.
High-strength bolt should adopt the screw thread and the circular arc tooth root screw-thread ending of dome round-bottom tooth profile, can eliminate Bottom of Thread, crest because of the concentrated bolt fracture that causes of break place stress, and is very favourable to improving the bolt fatigue resistance.The screw thread tooth top is circular arc can also effectively prevent the collide with damage of bolt when manufacturing, surface treatment, turnover and assembling.Especially when the bolt surface being carried out the coating processing, though adopt immersion plating can prevent the mechanical damage of thread surface, but in specialized production in enormous quantities, for enhancing productivity and guaranteeing the uniformity of coating, adopt tumble-plating process more favourable, and circle-arc tooth withstand on and can prevent effectively just in time in the barrel plating operation that screw thread from damaging.Because tooth top is circular shape, point discharge phenomenon when having overcome plating, it is attached even that tooth top coating, and no toothed edge and plating exfoliation have improved resistance to corrosion.In addition, the employing of circular arc tooth top is to improving product percent of pass, improve screwing property and preventing that assembly crewman's hand scuffing etc. from all having certain effect, so more and more come into one's own.External high-intensity fasteners screw thread has extensively adopted the technology of dome round-bottom tooth profile and circular arc tooth root screw-thread ending.
The production of high strength threaded fastener, threading tool is most important.The threading tool of using always when cylindrical die roll, screw plate are standard fasteners industry processing screw, bolt thread, its process principle is cold extrusion shaped, therefore advantages such as accuracy of thread that it has the production efficiency height, processing cost is low, automaticity is high, process and intensity height, surface quality are good have obtained extensive use.Domestic each tools factory is subjected to the production technology level restriction at present, can't reach above-mentioned requirements, wherein, standard GB/T971-94 " cylindrical die roll " and GB/T972-94 " screw plate " have put down in writing bolt machining tool cylindrical die roll and screw plate respectively, cylindrical die roll and screw plate profile of tooth are divided into A type and Type B in the national standard, wherein, the tooth top of the screw thread of Type B cylindrical die roll and screw plate and tooth root are flat shape, and the tooth top of the screw thread of A type cylindrical die roll and screw plate is a circular arc, tooth root is flat shape, and the crest both sides are the sharp edge chamfering.These cylindrical die rolls, screw plate rolling high-strength degree bolt all exist concentrated, the tired back of stress and give birth to phenomenon of rupture and potential risk of breakage (seeing accompanying drawing 2) at the last 1-2 garnishment of screw thread.Because the restriction of instrument, the foundation is weak of China's threaded fastener industry, what the overwhelming majority was produced is the regular screw threads securing member, and the special-shaped securing member critical shortage of the high strength screw thread of being badly in need of on the market, supply falls short of demand, and it is supporting that some purchasers have to spend a large amount of foreign exchange imports.
Summary of the invention
First purpose of the present invention is for providing a kind of cylindrical die roll of processing the high-strength bolt screw thread, to realize the processing high-strength bolt with dome round-bottom tooth profile and circular arc tooth root screw-thread ending.
Second purpose of the present invention is for providing a kind of screw plate of processing the high-strength bolt screw thread, to realize the processing high-strength bolt with dome round-bottom tooth profile and circular arc tooth root screw-thread ending.
In order to realize above-mentioned first purpose, the present invention adopts following technical scheme:
A kind of high-strength bolt screwing tool comprises cylindrical body, has screw thread on the cylindrical body, and screw thread has tooth top, tooth root and screw-thread ending, and tooth top is circular arc, and tooth root is circular arc; And screw-thread ending is the screw-thread ending of circular arc tooth root transition.
Arc radius 〉=the 0.125P of described tooth top～0.180P, the arc radius of tooth root is
, the screw thread chamfering of screw-thread ending is round tooth chamfering or the circular curve chamfering of Kr between 25 °-60 °, and length is within 2P; Part radius of rounded crest 〉=0.125P～the 0.180P of screw thread chamfering.
Described screw thread chamfering is C type or S type chamfering.
Described screw-thread ending is more than or equal to the screw-thread ending of 1 button to 2 buttons.
In order to realize above-mentioned second purpose, the present invention adopts following technical scheme:
A kind of screw plate of processing the high-strength bolt screw thread comprises plate shaped body, has screw thread on the plate shaped body, and screw thread has tooth top, tooth root and screw-thread ending, and tooth top is circular arc, and tooth root is circular arc; And screw-thread ending is the screw-thread ending of circular arc tooth root transition.
Arc radius 〉=the 0.125P of described tooth top～0.180P, the arc radius of tooth root is
, the screw thread chamfering of screw-thread ending is round tooth chamfering or the circular curve chamfering of Kr between 25 °-60 °, and length is within 2P; Part radius of rounded crest 〉=0.125P～the 0.180P of screw thread chamfering.
Described screw thread chamfering is C type or S type chamfering.
Described screw-thread ending is more than or equal to the screw-thread ending of 1 button to 2 buttons.
Adopt technique scheme, the cylindrical die roll of processing high-strength bolt screw thread of the present invention and screw plate have the advantage of the high-strength bolt of dome round-bottom tooth profile and circular arc tooth root screw-thread ending, profile of tooth is dome round bottom shape and circular arc tooth root screw-thread ending can have various combination, contain GB197-81 " Metric Thread's Tolerance with cooperate " the whole specifications of thread standard and series and unified screw thread made in U.S.A and whole specifications of BSW time system screw thread made in Great Britain and series, it is folded that the screw thread of the bolt of processing is not easy to form wrinkle in tooth top surface, concentrate the intensity that has improved bolt thereby reduced stress, the product quality of high-strength bolt securing member is stepped on a new stage.
In addition, the present invention also provides the processing method of the cylindrical die roll of processing the high-strength bolt screw thread and the processing method of processing the screw plate of high-strength bolt screw thread, and concrete technical scheme is as follows:
A kind of processing method of processing the cylindrical die roll of high-strength bolt screw thread, its step is included in roll extrusion on the cylindrical body, grinding and goes out thread tooth and heat-treat, and it is characterized in that: described to go out thread tooth in roll extrusion on the cylindrical body, grinding be to utilize the roll extrusion on cylindrical body of computer-controlled correction mechanism, grinding to go out tooth root to be circular arc and the screw-thread ending thread tooth for the transition of circular arc tooth root.
A kind of processing method of processing the screw plate of high-strength bolt screw thread, its step is included in roll extrusion on the plate shaped body, grinding and goes out thread tooth and heat-treat, and it is characterized in that: it is to utilize the roll extrusion on cylindrical body of computer-controlled correction mechanism, grinding to go out tooth root to be circular arc and the screw-thread ending thread tooth for the transition of circular arc tooth root that described roll extrusion on plate shaped body, grinding go out thread tooth.
The processing method of above-mentioned cylindrical die roll and the processing method of screw plate are to utilize computer-controlled machining process, have working (machining) efficiency height and advantage of high precision.
Description of drawings
Accompanying drawing 1: last figure is the bolt of circular arc tooth root screw-thread ending; Figure below is the cylindrical die roll of circular arc tooth root screw-thread ending shape.
Accompanying drawing 2: last figure is dangerous fracture place of screw-thread ending; The bolt of figure below for having ruptured.
Accompanying drawing 3: figure is an external screw thread tooth Bottom Shape.
Accompanying drawing 4: figure is a Bottom of Thread geomery tolerance range.
Accompanying drawing 5a: figure is the externally threaded design thread form of UN;
Accompanying drawing 5b: figure is the externally threaded design thread form of UNR.
Accompanying drawing 6a: figure is the unified standard inch screw thread UNJ form of thread maximum solid limit;
Accompanying drawing 6b: figure is the run-out(of thread) shape.
Accompanying drawing 7a: figure is an incomplete thread, standard size external diameter bar type securing member;
Accompanying drawing 7b: figure is an incomplete thread, middle footpath bar type securing member;
Accompanying drawing 7c: figure is a standard size external diameter bar type securing member, band convex shoulder bolt;
Accompanying drawing 7d: figure strengthens bar type securing member;
Accompanying drawing 7e: figure is a screw thread external diameter bar type securing member to the end;
Accompanying drawing 7f: figure is a screw thread middle footpath bar type securing member to the end.
Accompanying drawing 8a: figure is the MJ external screw thread design thread form of maximum solid state;
When accompanying drawing 8b: figure is tolerance range position h, the externally threaded upper and lower limit thread form of MJ.
Accompanying drawing 9: figure is the definition of 60 ° of inch system screw threads in the ANSI BI committee scope.
Accompanying drawing 10: figure is M8 * 1.25-6g thread crest geomery tolerance range.
Accompanying drawing 11: figure is the contrast of common profile of tooth screw thread and dome round-bottom tooth profile screw thread Electronic Speculum figure.
The specific embodiment
The cylindrical die roll and the screw plate of processing high-strength bolt screw thread of the present invention include body, have screw thread on the body, and wherein the body of cylindrical die roll is a cylindrical body, and the body of screw plate is plate shaped body; Shown in Fig. 1 figure below, their screw thread all has tooth top, tooth root and screw-thread ending.Wherein tooth top is circular arc, and the arc radius 〉=0.125P of tooth top～0.180P, tooth root also are circular arc, and the arc radius of tooth root is
Screw-thread ending is more than or equal to the screw-thread ending of 1 button to 2 button circular arc tooth root transition, the screw thread chamfering of screw-thread ending is round tooth chamfering or the circular curve chamfering of Kr between 25 °-60 °, be divided into C type or S type, and length is within 2P, the part radius of rounded crest 〉=0.125P～0.180P of screw thread chamfering.
In order to understand the present invention better, set forth below by Bottom of Thread shape and two aspects of thread crest shape to machining tool:
One, Bottom of Thread shape
Standard GB 197-81 " Metric Thread's Tolerance with cooperate " the 3rd joint Bottom of Thread shape, article 10, regulation: performance rate is greater than or equal to 8.8 grades securing member, its external screw thread tooth return pulley exterior feature will have the slick and sly curve that connects, the radius R of curved portion should be less than 0.125P, and its numerical value sees Table one.
The minimum root radius (Rmin) of table one external screw thread
| Pitch P mm | Rmin μm | Pitch P mm | Rmin μm |
| 0.2 0.25 0.3 | 25 31 38 | 1.25 1.5 1.75 | 156 188 219 |
| 0.35 0.4 0.45 | 44 50 56 | 2 2.5 3 | 250 313 375 |
| 0.5 0.6 0.7 | 63 75 88 | 3.5 4 4.5 | 438 500 563 |
| 0.75 0.8 1 | 94 100 125 | 5 5.5 6 | 625 688 750 |
The maximum path d1max position that forms during rounding at the bottom of the external screw thread tooth is tangent with the circular arc of two Rmin=0.125P at the same time straight line place.These two circular arcs must be respectively by the side of maximum solid tooth form and the intersection point on the path face of cylinder, and with the tangent (see figure 3) in minimum material side of screw thread.At this moment: maximum is scabbled height=H/4-Rmin{1-cos[π/3-arc cos (1-Td
2/ 4Rmin)]+Td
2/ 2
Minimum is scabbled height=0.125P ≈ H/7
(see figure 3) when the external screw thread basic deviation is in the h position, the upper deviation are zero, this moment maximum solid tooth form both sides with basic profile two side superimposed, it is that two circular arcs add a straight line that maximum is scabbled the tooth Bottom Shape of highly locating (being maximum path d1max place).In minimum material tooth form position, it is single circular arc that minimum is scabbled the tooth Bottom Shape of highly locating (being the d1max place).(in reality processing, it is all comparatively accurate and convenient to the finishing of abrasive wheel grinding wheel arc R and the measurement of R etc. to get single circular arc).Internal thread path and external screw thread path do not interfere when screw thread pair is screwed, should under the maximum solid state that H/4 cooperates, determine the size of external screw thread tooth bill kept on file circular arc, during promptly by H/4 and P/4 calculate, this moment, circular arc must be by the side of maximum solid tooth form and the intersection point on the path face of cylinder, when scabbling highly for H/6, scabble height and minimum is scabbled between the height between maximum, and should be less than 0.125P, promptly according to standard-required R
Rmin=P/8cos α is when P=1.25
Rmin＝1.25/(8*cos30°)≈0.180mm Rmax＝0.2825mm
(see figure 4)
It should be noted that Rmin=0.180mm is a result of calculation herein, different with the R of the Rmin=0.125P that stipulates in the standard.When design cylindrical die roll, screw plate tooth profile parameter and roller parameter, should with the basic profile foundation, according to external screw thread basic deviation and change of rank, be adjusted accordingly on the technology He on the roller, to reach designing requirement.
Volkswagen Automotive Co., Ltd and the center for standard VW126 of Adui Co., Ltd 24 standard codes: arc radius R=H/6=0.14434P at the bottom of the tooth; Show from interrelated data, arc radius R is fairly obvious to the fatigue resistance that improves bolt at the bottom of increasing tooth, use the tooth of high-strength bolt on the aircraft industry at the bottom of arc radius then increase to R=0.18042P (GJB GJB3.2-82) " size of MJ screw thread, screw bolt and nut and tolerance ".Below be domestic and international standard about the regulation of Bottom of Thread circular arc, computational methods and the comparison by circular arc R size at the bottom of the M8 * 1.25-6g tooth that calculates:
1. standard GB 197-81
Rmin＝0.125P Rmin＝0.156mm
2. GJB GJB3.2-82 (ISO5855)
Rmin＝0.15011P Rmin＝0.188mm
Rmax＝0.18024P Rmax＝0.226mm
3. Unite States Standard ANSI B1.1-82UNR tooth form
Rmin＝0.10825P Rmin＝0.135mm
Rmax＝0.14434P Rmax＝0.180425mm
4. u.s. federal standard H28 (the MJ screw thread is identical) UNJ tooth form
Rmin＝0.15011P Rmin＝0.188mm
Rmax＝0.18024P Rmax＝0.226mm
5. german standard din:
Rmax＝0.14434P Rmax＝0.180425mm
6. result of calculation:
Rmin＝0.14434P Rmin＝0.180425mm
Rmax＝0.226P Rmax＝0.2825mm
The GB197-81 performance rate is greater than or equal to 8.8 grades securing member, and its external screw thread tooth return pulley exterior feature will have the slick and sly curve that connects, and the radius R of curved portion should be less than 0.125P (not seeing Table 1), and these are consistent with ISO/68.
The externally threaded tooth return pulley of UNR exterior feature should be smooth, connect, reverse profile, and the radius of curvature at any some place must not be less than 0.108P, and should join with tooth form side and any straightway tangentially.Under maximum solid tooth form condition, points of tangency should be positioned at and be not less than 0.625H place, basic big footpath at least, and maximum circular arc is 0.14434P then.(seeing Fig. 5 a, Fig. 5 b)
UNJ Bottom of Thread arc radius, flank profil should be one continuously, level and smooth, coincide, the curve of no withdrawing, do not have a part of curve that a radius less than 0.15011P is arranged, and curve be not less than on the 0.5625H degree of depth tangent with the ridge side.If the external screw thread path is in minimum and maximum determined radial extension, flank profil may comprise the section circular arc, and they are connected in the tooth bottom by tangent plane, and flank profil must optic test.Knuckle radius R 〉=the 0.15011P of a minimum radius of rounded root that is equal to or greater than the complete thread shown in Fig. 6 a and the run-out(of thread) shape shown in Fig. 6 b should be arranged at the bottom of the tooth of run-out(of thread) incomplete thread.Their sizes commonly used see Table two.
The unified inch screw Bottom of Thread arc radius limit of table two UNJ and go side ring gauge path
(mm)
At the bottom of the externally threaded tooth of MJ with the tooth side, the curve smooth by circular arc connects, any one its radius value of connection circular arc of curve must not be less than 0.15011P, bending direction only allows that recessed this circular arc is in the maximum solid tooth form to (relatively the axis of thread), and being tangential on groove width with the tooth form both side surface is the 5/16P place, its radius value is 0.18042P, this circular arc is in the minimum material tooth form, and when the end directly was minimum limit of size d3min, its radius value was 0.15011P.This circular arc also can constitute (seeing Fig. 8 a, Fig. 8 b) by being cut in the straight line that tooth side two circular arcs link to each other with the bottom, and concrete parameter sees Table three.
Table three MJ Bottom of Thread radial limits value
High-strength bolt thread tooth moulding in sum, must instrument design and and when making, guarantee that processed thread tooth, tooth root circular arc and screw-thread ending meet the parameter of each standard and tabular.Transition region between screw-thread ending is meant at the bottom of the tooth of button complete thread last of product, the maximum path that the path of this complete thread equals to allow, the minimum big footpath that its big footpath equals to allow.When root radius was had regulation, the root radius of last button complete thread at the path place must satisfy the regulation requirement.(seeing Fig. 7 a, Fig. 7 b, Fig. 7 c, Fig. 7 d, Fig. 7 e, Fig. 7 f)
The comparison of related various unified screw threads in the national standard of ANSI U.S. thread standard committee promulgation
| Screw thread identification | UN thread, internal thread and external screw thread | The UNR screw thread is external screw thread only | UNJ thread, internal thread and external screw thread |
| B1.1: unified inch system screw thread | B1.1: unified inch system screw thread | B1.15 (draft): |
| The ansi standard file | B1.2: the gauge and the check thereof of unified inch system screw thread | B1.2: the gauge and the check thereof of unified inch system screw thread | Unified inch system screw thread-UNJ form of thread B1.2: the gauge and the check thereof of unified inch system screw thread |
| At the bottom of the external screw thread tooth | Can be flat at the bottom of the external screw thread tooth, also can be rounding | At the bottom of the rounding tooth of appointment | At the bottom of the rounding tooth of appointment |
| The external screw thread path | External screw thread path zero allowance | External screw thread path zero allowance | External screw thread path zero allowance |
| External screw thread | Grade: 1A level, 2A level and 3A level | UNR grade: 1A level, 2A level and 3A level | The 3A level external screw thread of UNJ a screw-internal thread fit with UNJ |
| Internal thread | UN grade: 1B level, 2B level and 3B level | The internal thread of mark UNR does not exist; The UNR external screw thread is with the UN screw-internal thread fit | UNJ grade: 3B level (no rounding requires at the bottom of the tooth of internal thread) |
(see figure 9)
Two, thread crest shape
About the tooth top arc size of bolt thread and determining of tolerance, " it is several foreign standard legends of 60 ° dome round bottom screw thread that profile angle is arranged in international thread handbook, " the thread standard complete works " by consulting, discovery tooth proportions, tooth top circular arc radius size and tolerance all do not have unified canonical parameter, differ greatly between the various criterion.
According to the interchangeability requirement of screw thread,, when definite thread tip circle arc basic parameter, should satisfy the requirement that ISO965/1-80, DIN13 the 13rd part cut top H/8 equally according to standard GB 196, GB197 and relevant foreign standard.Through the screw thread receiver ga(u)ge after the assay was approved, should guarantee not take place tooth top and interfere when exchanging use, the size of circular arc and tolerance should be consistent with Major Diam size and tolerance height, i.e. the tangent (see figure 10) of the minimum of circular arc and maximum limit of size and flank.
By theory analysis and calculating, thread tip circle arc radius should be got R=0.10825P+ (Td+es-Td
2)/2 are detected by the thread tip circle arc to fastenings such as the CKD wheel screw screw thread of German import, Japanese HONDA125 engine cylinder cover stud bolt threads, and the result is identical substantially.In design, when making dome round-bottom tooth profile thread wheel, screw plate, necessary comprehensive considering various effects is as thread tolerance band and required precision.Therefore, the processing method of the cylindrical die roll of processing high-strength bolt screw thread of the present invention is to utilize the roll extrusion on cylindrical body of computer-controlled correction mechanism, grinding to go out tooth root to be circular arc and screw-thread ending for the thread tooth of the cylindrical die roll of circular arc tooth root transition, heat-treats at last until the product thread forming; The processing method of the screw plate of processing high-strength bolt screw thread is to utilize the roll extrusion on cylindrical body of computer-controlled correction mechanism, grinding to go out tooth root to be circular arc and screw-thread ending for the thread tooth of the screw plate of circular arc tooth root transition, heat-treats at last until the product thread forming.Each link all should strict be controlled in the processing method of above-mentioned cylindrical die roll and screw plate, thereby the screw thread physical dimension and the form error that guarantee product all are controlled in the tolerance range.
The thread tooth of high-strength bolt is a dome round-bottom tooth profile circular arc tooth root screw-thread ending, can eliminate crest at the bottom of the tooth effectively because of stress concentration phenomenon that break caused, improve its fatigue resistance, the mechanical damage that prevents or take place when reducing thread surface because of turnover, assembling, surface treatment.See Figure 11, therefrom can find out common profile of tooth cylindrical die roll rolled thread after, stayed in the cold extrusion shaped process because metal material distortion, displacement produce the continuous slit that does not close, two cusp wrinkles relatively more serious (title cornerite, overseam are also arranged) in tooth top surface.The deep stress of this pair of cusp wrinkle is more concentrated, what have reaches about 100 μ m deeply, the one-tenth downtree fork branch shape that has, stay the micro-crack state at the groove top surface, the break stress of tooth top both sides is also comparatively concentrated simultaneously, the tooth top part is made up of bigger plastic deformation metal flow fold, and particularly the high-strength screw counter stress is very responsive.Moreover, because the condition that bolt is on active service is relatively poor, be subjected to the influence of surrounding medium very big, very easily generate etch pit and fall at this, pH value is descended, hydrogen is invaded in the steel and delayed fracture is taken place.Behind the cylindrical die roll rolled thread of dome round-bottom tooth profile, the folded phenomenon of this wrinkle is just less, and this is directly relevant with cylindrical die roll, screw plate profile of tooth, because metal material is mobile between cog, guiding, distortion, moulding during rolled thread.
Therefore screw-thread ending of the present invention and dome round-bottom tooth profile machining tool have the advantage that can process the high-strength bolt that adopts dome round-bottom tooth profile and circular arc tooth root screw-thread ending, profile of tooth is dome round bottom shape and circular arc tooth root screw-thread ending can have various combination, contain GB197-81 " Metric Thread's Tolerance with cooperate " the whole specifications of thread standard and series and unified screw thread made in U.S.A and whole specifications of BSW time system screw thread made in Great Britain and series, it is folded that the screw thread of the bolt of processing is not easy to form wrinkle in tooth top surface, concentrate the intensity that has improved bolt thereby reduced stress, the product quality of high-strength bolt securing member is stepped on a new stage.
Claims (10)
1, a kind of cylindrical die roll of processing the high-strength bolt screw thread comprises cylindrical body, has screw thread on the cylindrical body, and screw thread has tooth top, tooth root and screw-thread ending, and tooth top is circular arc, and tooth root is circular arc; It is characterized in that:
Described screw-thread ending is the screw-thread ending of circular arc tooth root transition.
2, the cylindrical die roll of processing high-strength bolt screw thread according to claim 1 is characterized in that:
Arc radius 〉=the 0.125P of described tooth top～0.180P, the arc radius of tooth root is
The screw thread chamfering of screw-thread ending is round tooth chamfering or the circular curve chamfering of Kr between 25 °-60 °, and length is within 2P; Part radius of rounded crest 〉=0.125P～the 0.180P of screw thread chamfering.
3, the cylindrical die roll of processing high-strength bolt screw thread according to claim 2 is characterized in that:
Described screw thread chamfering is C type or S type chamfering.
4, the cylindrical die roll of processing high-strength bolt screw thread according to claim 1 is characterized in that:
Described screw-thread ending is more than or equal to the screw-thread ending of 1 button to 2 buttons.
5, a kind of screw plate of processing the high-strength bolt screw thread comprises plate shaped body, has screw thread on the plate shaped body, and screw thread has tooth top, tooth root and screw-thread ending, and tooth top is circular arc, and tooth root is circular arc; It is characterized in that:
Described screw-thread ending is the screw-thread ending of circular arc tooth root transition.
6, the screw plate of processing high-strength bolt screw thread according to claim 5 is characterized in that:
Arc radius 〉=the 0.125P of described tooth top～0.180P, the arc radius of tooth root is
The screw thread chamfering of screw-thread ending is round tooth chamfering or the circular curve chamfering of Kr between 25 °-60 °, and length is within 2P; Part radius of rounded crest 〉=0.125P～the 0.180P of screw thread chamfering.
7, the screw plate of processing high-strength bolt screw thread according to claim 6 is characterized in that:
Described screw thread chamfering is C type or S type chamfering.
8, the screw plate of processing high-strength bolt screw thread according to claim 5 is characterized in that:
Described screw-thread ending is more than or equal to the screw-thread ending of 1 button to 2 buttons.
9, a kind of processing method of processing the cylindrical die roll of high-strength bolt screw thread, its step is included in roll extrusion on the cylindrical body, grinding and goes out thread tooth and heat-treat, and it is characterized in that: described to go out thread tooth in roll extrusion on the cylindrical body, grinding be to utilize the roll extrusion on cylindrical body of computer-controlled correction mechanism, grinding to go out tooth root to be circular arc and the screw-thread ending thread tooth for the transition of circular arc tooth root.
10, a kind of processing method of processing the screw plate of high-strength bolt screw thread, its step is included in roll extrusion on the plate shaped body, grinding and goes out thread tooth and heat-treat, and it is characterized in that: it is to utilize the roll extrusion on cylindrical body of computer-controlled correction mechanism, grinding to go out tooth root to be circular arc and the screw-thread ending thread tooth for the transition of circular arc tooth root that described roll extrusion on plate shaped body, grinding go out thread tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100291953A CN100513000C (en) | 2005-08-29 | 2005-08-29 | Processing tool of high strength bolt and processing method of the processing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100291953A CN100513000C (en) | 2005-08-29 | 2005-08-29 | Processing tool of high strength bolt and processing method of the processing tool |
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| CN1923401A CN1923401A (en) | 2007-03-07 |
| CN100513000C true CN100513000C (en) | 2009-07-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5401667B2 (en) * | 2007-10-12 | 2014-01-29 | 有希 安藤 | Method for manufacturing rolled screw shaft |
| JP5053399B2 (en) * | 2010-02-22 | 2012-10-17 | ユニオンツール株式会社 | Rolling dies |
| CN101829747B (en) * | 2010-06-07 | 2012-12-26 | 无锡赛可电气有限公司 | Thread rolling die |
| DE102011078256A1 (en) * | 2011-06-29 | 2013-01-03 | Hilti Aktiengesellschaft | Screw and method of making a screw thread |
| CN107486519A (en) * | 2016-06-12 | 2017-12-19 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of short ending cylindrical die roll |
| CN109648022B (en) * | 2019-02-02 | 2024-01-23 | 张咏 | Seamless burr-free extrusion tap and internal thread manufactured by same |
| CN110695272A (en) * | 2019-10-11 | 2020-01-17 | 江苏森林建筑新材料股份有限公司 | Thread rolling wheel suitable for concrete reinforcing steel bar |
| CN111250941A (en) * | 2020-02-19 | 2020-06-09 | 惠州市金思维科技有限公司 | Processing technology of anti-collision screw rod |
| CN112576594B (en) * | 2020-12-07 | 2022-01-11 | 泰尔重工股份有限公司 | Large-root fillet uniform-strength thread and machining method thereof |
| CN114851081B (en) * | 2022-05-30 | 2024-03-26 | 四川英诺航空科技有限公司 | Diamond roller for rolling round bottom grinding wheel of round bottom and method for rolling round bottom grinding wheel of round bottom |
| CN116877555B (en) * | 2023-06-05 | 2024-06-14 | 中船海为高科技有限公司 | Double-end stud for connecting wind turbine generator blade root and processing method thereof |
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Non-Patent Citations (4)
| Title |
|---|
| 圆底圆顶齿形高强度螺栓滚丝轮. 徐根林.工具技术，第29卷第11期. 1995 |
| 圆底圆顶齿形高强度螺栓滚丝轮. 徐根林.工具技术，第29卷第11期. 1995 * |
| 轿车车轮固定螺栓断裂原因分析及工艺研究. 徐根林，蔡瑞华.工具技术，第36卷第7期. 2002 |
| 轿车车轮固定螺栓断裂原因分析及工艺研究. 徐根林，蔡瑞华.工具技术，第36卷第7期. 2002 * |
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