CN109967982A - A kind of preparation method of wind power generating set circular thread anchor component - Google Patents
A kind of preparation method of wind power generating set circular thread anchor component Download PDFInfo
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- CN109967982A CN109967982A CN201910351448.0A CN201910351448A CN109967982A CN 109967982 A CN109967982 A CN 109967982A CN 201910351448 A CN201910351448 A CN 201910351448A CN 109967982 A CN109967982 A CN 109967982A
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- 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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a kind of wind power generating set preparation methods of circular thread anchor component, and round steel bar and as desired scale or multiple length is selected to roll corresponding length as blank；Ultrasound+leakage field joint flaw detection is carried out to blank；Blank is heat-treated；Alignment processing is carried out to blank and removes surface scale；Vortex or magnetic powder inspection processing are carried out to blank；Circular thread is rolled at workpiece both ends by screw-rolling machine, obtains anchor bolt；Select round steel bar that sawing machine is used to carry out blanking to predetermined size as blank；Forging molding punching is carried out to blank；With lathe face work and inner hole, chamfering；With the threaded circular thread internal screw thread of screw tap；Workpiece is heat-treated with vacuum drying oven, obtains nut.Circular thread anchor bolt preparation method of the invention does not need removal material substantially, need to only be straightened removal surface scale, and the diameter tolerance control before anchor bolt rolled thread is in ± 0.3mm, and stock utilization is high, and production process is few, and production cost is low.
Description
Technical field
The invention belongs to wind-power electricity generation group pylons to be bolted, anchor bolts technical field, and in particular to a kind of wind-force hair
The preparation method of motor group circular thread anchor component.
Background technique
Prestressing force blower foundation is the novel wind generator group base that the country such as the earlier 2000s U.S., Canada proposes
Plinth technology, can effectively solve that traditional gravity type basis ring type foundation construction low efficiency, bending resistance resistance to capsizing be poor, application environment
The problems such as adaptability for working condition is poor, hidden danger of quality is complicated difficult to control, has resistant slide, antidumping, environmental resistance excellent.It is high-intensitive
Anchor bolt is the core component of prestressing force blower foundation, and prestressed anchor bolt assembly includes anchor bolt, nut etc., generallys use screw thread company
It connects, existing threaded form of thread can be divided into triangle thread, saw-tooth thread, trapezoidal thread and pipe screw thread etc.." steel construction is used
High-intensitive anchor bolts pair " the high-intensitive anchoring anchor bolts pair of M20-M64 steel construction is defined in (GB/T 33943-2017)
Technical requirements and dimensions, all using the common metric thread of general service, i.e. angular thread." wind power generating set is high
Strong threaded connection pair installation specification " M6-M64 bolt, spiral shell in wind-power electricity generation group are defined in (GB/T 33628-2017)
The installation specification of the threaded connection pair of nail, stud and nut, also using the common metric thread of general service.State at present
The precision that interior wind-powered electricity generation anchor bolt is threadedly engaged is 6g/6H, and there are three types of the process programs generallyd use: scheme one, blanking -- > thick school
Directly -- > heat treatment -- > essence alignment -- > flaw detection -- > Vehicle Processing/grinding -- > rolled thread -- > anti-corrosion；Scheme two, blanking -- > thick
Alignment -- > heat treatment -- > essence alignment -- > flaw detection -- > necking down -- > rolled thread -- > anti-corrosion；Scheme three, blanking -- > slightly alignment --
> annealing -- > drawing -- > heat treatment -- > essence alignment -- > flaw detection -- > Vehicle Processing/grinding -- > rolled thread -- > anti-corrosion.Using rice
The screw thread pair being threadedly coupled is made, the diameter tolerance of anchor bolt material is generally required to be ± 0.1mm before rolled thread, and material is sharp
It is low with rate.In actual use, screw thread once collides with, and will affect installing and using for normal threaded connection pair.The metric system
Form of thread, the connection between bolts and nuts, anchor bolt and nut is not smooth enough, is easy to produce stress concentration phenomenon, in wind-force
Under the inferior high-frequency reciprocating dynamic loads effect of generating set normal operating conditions, fracture easily occurs or loosens, once it loses
It imitates, artificial repair and maintenance is difficult to find in time, and there are certain hidden dangers in project.In addition, domestic a part of anchor bolt producer uses intermediate frequency
Quenching+intermediate frequency tempering heat treatment mode, the end effect of one side anchor bolt heat treatment cause waste of material, another aspect anchor bolt
Surface hardness is higher, is unfavorable for later period rolling and processing.
Summary of the invention
To solve the above problems, the present invention provides a kind of preparation side of wind power generating set circular thread anchor component
Method reduces difficulty of processing using continuous non-standard circle-arc screw-thread structure, reduces stress concentration phenomenon, and scene is adaptable,
With excellent axial anti-pulling and fatigue behaviour.
The object of the present invention is achieved in the following manner:
A kind of preparation method of wind power generating set circular thread anchor component, the circular thread anchor component, including anchor bolt
And nut, mutually matched inside and outside circular thread is provided on anchor screw bolt and nut,
The preparation method of the anchor bolt the following steps are included:
11) round steel bar and as desired scale or multiple length is selected to roll corresponding length as blank；
12) alignment processing, both ends chamfered edge are carried out to blank using straightener；
13) ultrasound+leakage field joint flaw detection is carried out to blank using defectoscope；
14) blank is heat-treated；
15) alignment processing is carried out to blank and removes surface scale；
16) vortex is carried out to blank using defectoscope or magnetic powder inspection is handled；
17) circular thread is rolled at workpiece both ends by screw-rolling machine, obtains anchor bolt；
18) preservative treatment is carried out to anchor bolt；
The preparation method of the nut the following steps are included:
21) select round steel bar that sawing machine is used to carry out blanking to predetermined size as blank；
22) forging molding punching is carried out to blank according to nut outer dimension；
23) lathe face work and inner hole, chamfering are used；
24) the threaded circular thread internal screw thread of screw tap is used；
25) workpiece is heat-treated with vacuum drying oven, obtains nut；
26) preservative treatment is carried out to nut.
In the range of ± 0.3mm, blank curvature is less than the diameter tolerance of blank described in step 13) and step 16
2mm/m, overall length curvature is less than 0.1%；Surface quality grades are that ultrasonic inspection is A grades, and magnetic leakage detection is 3 grades, and eddy current inspection is
6 grades, magnetic powder inspection is I grade.
Heat treatment described in step 14) includes quenching and tempering, carries out mid-frequency induction hardening using intermediate frequency furnace, uses
Whole fiber well formula tempering furnace is tempered.
The inside and outside circular thread is the connection screw thread of face contact, and the continuous circular arc screw thread in anchor bolt is external screw thread, by upper
Crest circular arc, straightway, lower tooth bottom circular arc, straightway are sequentially connected composition, the radius of upper tooth tip circle arc and lower tooth bottom circular arc
Radius is equal, and straightway is tangent with upper tooth tip circle arc, lower tooth bottom circular arc respectively；Continuous circular arc screw thread on nut is internal screw thread,
It is sequentially connected and is formed by upper half circular arc, tangential straightway, crest, crest is plane, and tangential straightway and upper half circular arc are tangent, spiral shell
Female height is at least 7.5 times of screw pitch；Threaded connection pair is non-wide transverse tooth thickness, and external screw thread transverse tooth thickness is greater than internal screw thread transverse tooth thickness, outer spiral shell
Line thread form angle is equal with internal screw thread thread form angle.
The stress sectional area of the circular thread anchor component is 1120mm2, screw pitch 6.35mm, external screw thread major diameter is
41.5mm, pitch diameter of external thread 39mm, external screw thread path are 36.5mm, a height of 2.5mm of external screw thread tooth, and upper radius of rounded crest is
1.5mm, lower radius of rounded root are 1.5mm, and internal screw thread path is 37.5mm, a height of 2.2mm of internal screw thread tooth；Nut diagonal distance
For 74mm, nut opposite side distance is 65mm, and height of nut 48mm, external screw thread thread form angle and internal screw thread thread form angle are 60 °.
The stress sectional area of the circular thread anchor component is 1474mm2, screw pitch 8.5mm, external screw thread major diameter is
48.3mm, pitch diameter of external thread 45mm, external screw thread path are 41.7mm, a height of 3.3mm of external screw thread tooth, and upper radius of rounded crest is
2.0mm, lower radius of rounded root are 2.0mm, and internal screw thread path is 43.5mm, a height of 2.8mm of internal screw thread tooth；Nut diagonal distance
For 80mm, nut opposite side distance is 70mm, and height of nut 64mm, external screw thread thread form angle and internal screw thread thread form angle are 60 °.
The method that preservative treatment is carried out to anchor bolt in step 18 are as follows: anchor pole overall length applies anti-corrosive grease, and anchor pole is located at wind-force hair
Intermediate position inside motor group winds film cladding with PE, then PE pipe, PE pipe both ends are worn in the intermediate position of PE winding film cladding
With the heat shrinking sleeve seal of tube, interim protective cap is not arranged by the both ends that PE winding film coats in anchor pole.
In step 26) to nut carry out preservative treatment method are as follows: nut use Dacroment or zincizing preservative treatment, it is resistance in
Property the salt fog time be not less than 1000 hours.
The strength grade of the anchor bolt is 8.8 grades, and material is 42CrMoA or 35CrMoA, it is specified that plastic elongation intensity Rp0.2
>=660MPa, tensile strength Rm >=830MPa, elongation after fracture >=12%, anchor bolt hardness range 25-30HRC, anchor bolt surface and the heart
The ballistic work average value KV of portion's difference of hardness control three samples in 2HRC, -40 DEG C2≥60J；Nut strength grade is 8 grades, material
Matter is 42CrMoA or 35CrMoA, hardness 22-27HRC.
Compared with the existing technology, the beneficial effects of the present invention are:
(1) circular thread anchor bolt preparation method of the invention does not need removal material substantially, need to only be straightened removal surface oxidation
Skin, the diameter tolerance control before anchor bolt rolled thread is in ± 0.3mm, and stock utilization is high, and production process is few, production cost
It is low.
(2) anchor bolt of the invention uses the heat treatment process of mid frequency induction hardening and well furnace tempering, workpiece surface oxidation and decarbonization
It is few, save raw material, working environment is good, pollution-free, low energy consumption；Tempering is not present end effect, anchor bolt end and intermediate position,
Surface and center portion mechanical property are uniform, and the hardness of well furnace tempering is tempered low 2-3HRC than intermediate frequency, greatly reduce rolling and processing
Difficulty reduces the loss of cylindrical die roll.
(3) circular thread auxiliary connection of the invention uses circular arc thread dental pattern, and internal screw thread and external screw thread are face contact, stress
Uniformly, stress when can be effectively reduced screw thread carrying is concentrated, and anti-fatigue performance is good.Circular thread auxiliary connection of the invention is
Non- wide transverse tooth thickness, axial fit clearance is big, and size is adaptable, is easy to in-site installation.Circular arc internal screw thread and externally threaded cooperation
It is increasingly closer with the work of connected device, it is effectively prevented loosening.Circular thread uses big screw pitch circular thread, effectively
Damage phenomenon caused by avoiding installation, the screw thread in use process from colliding with.Circular thread external screw thread crest of the invention is circular arc
Shape, when rolled thread, metal plastic deformation region is small, and rolling power is small, and rolling and processing die life is high, greatly reduce rolling plus
Work manufacture difficulty.
(4) anchor bolt overall length of the invention makes anti-corrosion grease using the flexible corrosion protection measure of PE winding film and preservation rouge
It is reliably attached in anchor bolt, is easily achieved in engineering, not only solve the protection question in transhipment, transport and storage process,
And corrosion-inhibiting coating is destroyed since prestressing force leads to the problem of surface elongation deformation when avoiding anchor bolt work, improve anti-corrosion
Service life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of circular thread auxiliary connection of the invention；
Fig. 2 is the cooperation schematic diagram of circular thread auxiliary connection in the present invention；
Fig. 3 is the externally threaded structural schematic diagram of circular thread in the present invention；
Fig. 4 is the structural schematic diagram of circular thread internal screw thread in the present invention；
Fig. 5 is the externally threaded scale diagrams of circular thread in the present invention；
Fig. 6 is the scale diagrams of circular thread internal screw thread in the present invention；
Fig. 7 is the scale diagrams of nut main view in the present invention；
Fig. 8 is the scale diagrams of nut side view in the present invention；
Fig. 9 is the mounting structure schematic diagram of anchor rod component of the present invention；
Figure 10 is anchor pole overall length anti-corrosion schematic diagram；
Figure 11 is the main view of head protector；
Figure 12 is the top view of head protector.
Wherein, 1 is bolt；2 be nut；3 be upper tooth tip circle arc；4 be straightway；5 be lower tooth bottom circular arc；6 be upper semi-circle
Arc；7 be tangential straightway；8 be crest；9 be high-strength grout；10 be concrete；11 be PE pipe；12 be lower anchor slab；13 be PE
Wind film；14 be interim protective cap；15 be nut II；16 be locking nut；17 be nut I；18 be head protector；19 be tower method
It is blue；20 be thermal contraction casing tube；21 be gasket；L1 is threaded upper ends position；L2 is lower thread position；L3 is intermediate position.
Specific embodiment
A kind of preparation method of wind power generating set circular thread anchor component, the circular thread anchor component, including
Mutually matched inside and outside circular thread is provided on anchor bolt 1 and nut 2, anchor bolt 1 and nut 2,
The preparation method of anchor bolt 1 the following steps are included:
11) round steel bar and as desired scale or multiple length is selected to roll corresponding length as blank；
12) alignment processing, both ends chamfered edge are carried out to blank using straightener；
13) ultrasound+leakage field joint flaw detection is carried out to blank using defectoscope；
14) blank is heat-treated；
15) alignment processing is carried out to blank and removes surface scale；
16) vortex is carried out to blank using defectoscope or magnetic powder inspection is handled；
17) circular thread is rolled at workpiece both ends by screw-rolling machine, obtains anchor bolt；
18) preservative treatment is carried out to anchor bolt；
The preparation method of nut 2 the following steps are included:
21) select round steel bar that sawing machine is used to carry out blanking to predetermined size as blank；
22) forging molding punching is carried out to blank according to nut outer dimension；
23) lathe face work and inner hole, chamfering are used；
24) the threaded circular thread internal screw thread of screw tap is used；
25) workpiece is heat-treated with vacuum drying oven, obtains nut；
26) preservative treatment is carried out to nut.
Quenching and tempering are carried out to nut workpiece using vacuum drying oven, eliminate the oxygen of workpiece surface in heating process
Change, decarburization, can get the clean surface without metamorphic layer.
In the range of ± 0.3mm, blank curvature is less than the diameter tolerance of blank described in step 13) and step 16
2mm/m, overall length curvature can satisfy the requirement of circular thread rolling and processing less than 0.1%；Surface quality grades are ultrasonic inspection
It is A grades, magnetic leakage detection is 3 grades, and eddy current inspection is 6 grades, and magnetic powder inspection is I grade.
Heat treatment described in step 14) includes quenching and tempering, carries out mid-frequency induction hardening, quenching using intermediate frequency furnace
Temperature is 830 DEG C, and the type of cooling is water cooling, is tempered using Whole fiber well formula tempering furnace, and tempering temperature is 650 DEG C, heat preservation
Time is 8h.Using mid-frequency induction hardening, induction heating speed is fast, since heat is being heated inside workpiece generation, rises
Warm speed is fast, can improve low temperature impact properties with rapid refinement crystal grain, heating in medium frequency efficiency is up to 95%, and workpiece surface oxidation is de-
Carbon is few, saves raw material, and working environment is good, pollution-free, low energy consumption.Using Whole fiber well formula tempering furnace, end is not present in tempering
Effect, anchor bolt end and intermediate position, surface and center portion mechanical property are uniform, and hardness is tempered low 2~3HRC than intermediate frequency, significantly
Rolling and processing difficulty is reduced, the loss of cylindrical die roll is reduced.Anchor bolt is placed in well formula tempering furnace with vertical state, on the one hand, anchor
It deforms small after bolt heat treatment, ensure that the straightness of anchor bolt, for another aspect anchor bolt under thermal stress effect, anchor bolt can be slightly with stretching
Long, stock utilization is high.
As shown in figures 1-8, inside and outside circular thread is the connection screw thread of face contact, and the continuous circular arc screw thread in anchor bolt 1 is outer
Screw thread is sequentially connected and is formed by upper tooth tip circle arc 3, straightway 4, lower tooth bottom circular arc 5, straightway 4, the radius of upper tooth tip circle arc 3
Equal with the radius of lower tooth bottom circular arc 5, straightway 4 is tangent with upper tooth tip circle arc 3, lower tooth bottom circular arc 5 respectively；Company on nut 2
Continuous circular thread is internal screw thread, is sequentially connected and is formed by upper half circular arc 6, tangential straightway 7, crest 8, and crest 8 is plane, tangentially
Straightway 7 and upper half circular arc 6 are tangent, and the height of nut 2 is at least 7.5 times of screw pitch；Threaded connection pair is non-wide transverse tooth thickness, outer spiral shell
Line transverse tooth thickness is greater than internal screw thread transverse tooth thickness, and external screw thread thread form angle is equal with internal screw thread thread form angle.
In attached drawing, d is external screw thread major diameter, d2For pitch diameter of external thread, d3For external screw thread path, R1For upper radius of rounded crest,
R2It is screw pitch, θ for lower radius of rounded root, P1For external screw thread thread form angle, H1For tooth height, D1For internal screw thread path, D2For internal screw thread
Central diameter, D are internal screw thread major diameter, R3For upper half arc radius, H2For tooth height, θ2For internal screw thread thread form angle, s1For external screw thread transverse tooth thickness, s2
For internal screw thread transverse tooth thickness, m be height of nut, e is diagonal length, s is to edge lengths.
The stress sectional area of circular thread anchor component is 1120mm2, screw pitch 6.35mm, external screw thread major diameter is
41.5mm, pitch diameter of external thread 39mm, external screw thread path are 36.5mm, a height of 2.5mm of external screw thread tooth, and upper radius of rounded crest is
1.5mm, lower radius of rounded root are 1.5mm, and internal screw thread path is 37.5mm, a height of 2.2mm of internal screw thread tooth；Nut diagonal distance
For 74mm, nut opposite side distance is 65mm, and height of nut 48mm, external screw thread thread form angle and internal screw thread thread form angle are 60 °.
The stress sectional area of circular thread anchor component is 1474mm2, screw pitch 8.5mm, external screw thread major diameter is 48.3mm,
Pitch diameter of external thread is 45mm, and external screw thread path is 41.7mm, and a height of 3.3mm of external screw thread tooth, upper radius of rounded crest is 2.0mm,
Lower radius of rounded root is 2.0mm, and internal screw thread path is 43.5mm, a height of 2.8mm of internal screw thread tooth；Nut diagonal distance is
80mm, nut opposite side distance is 70mm, and height of nut 64mm, external screw thread thread form angle and internal screw thread thread form angle are 60 °.
The method that preservative treatment is carried out to anchor bolt in step 18 are as follows: 1 overall length of anchor pole applies anti-corrosive grease, and anchor pole 1 is located at wind-force
Intermediate position L3 inside generating set winds film 13 with PE and coats, then the intermediate position L3 that PE winding film 13 coats is worn PE pipe
11, PE pipe, 11 both ends are sealed with thermal contraction casing tube 15, and interim protective cap is not arranged by the both ends that PE winding film 13 coats in anchor pole 1
14.Anchor bolt overall length makes anti-corrosion grease be reliably attached to anchor using the flexible corrosion protection measure of PE winding film 13 and preservation rouge
It on bolt 1, is easily achieved in engineering, not only solves the protection question in transhipment, transport and storage process, and avoid anchor bolt
Corrosion-inhibiting coating is destroyed since prestressing force leads to the problem of surface elongation deformation when 1 work, improves anti-corrosion service life.
The method that preservative treatment is carried out to nut in step 26) are as follows: nut 2 uses Dacroment or zincizing preservative treatment, resistance to
The neutral salt spray time is not less than 1000 hours.
The strength grade of the anchor bolt is 8.8 grades, and material is 42CrMoA or 35CrMoA, it is specified that plastic elongation intensity Rp0.2
>=660MPa, tensile strength Rm >=830MPa, elongation after fracture >=12%, anchor bolt 25~30HRC of hardness range, anchor bolt surface and
The ballistic work average value KV of centre hardness difference control three samples in 2HRC, -40 DEG C2≥60J；Nut strength grade is 8 grades,
Material is 42CrMoA or 35CrMoA, and hardness is 22~27HRC.
The anti-corrosion method of anchor component, anchor component include anchor bolt 1, nut I 17, nut II 15, locking nut 16 and pad
Piece 21 carries out preservative treatment to it respectively according to the following steps as shown in figs. 9-10:
1) preservative treatment of anchor bolt 1: 1 overall length of anchor bolt applies anti-corrosive grease, and anchor bolt 1 is located at the intermediate position inside wind power generating set
L3 PE winds film 13 and coats, then the intermediate position L3 that PE winding film 13 coats is worn PE pipe 11, and 11 both ends of PE pipe are heat-shrinked
Casing 20 seals, and interim protective cap 14 is not arranged by the both ends that PE winding film 13 coats in anchor bolt 1；
2) preservative treatment of nut I 17, nut II 15, locking nut 16 and gasket 21: nut I 17 and gasket 21 use Dacroment
Surface treatment, nut II 15 and locking nut 16 are using nigrescence or Dacroment surface treatment；
3) it installs: after anchor rod component is transported to scene, the interim protective cap 14 at 1 both ends of anchor bolt being removed, anchor bolt 1 successively penetrates down
Anchor slab 12, locking nut 16 and tower drum flange 19 form anchor pole cage, and nut I 17 and nut II 15,10 He of casting concrete are put in rotation
High-strength grout 9；
4) after anchor bolt tensioning, in the clearance portion for being threadedly engaged position, anchor bolt 1 and tower drum flange 19 of anchor bolt 1 and nut I 17
Position is sealed with waterproof silicone grease or anti-corrosive grease, exposed anchor bolt 1, nut I 17 and gasket at the top of foundation of wind-driven generator unit
Place head protector 18 in 21 outsides.
Anti-corrosive grease is unbonded prestressing tendon anti-corrosion grease, the regulation of Ying Fuhe JG/T 430, with spray, dipping
Or the mode that automatic oiling device is smeared coats, coating layer thickness is 0.1~0.3mm.Anti-corrosive grease is added by lube base oil
Lubricating oil made from various antirust agent or lubricating grease, the rust-proof coating as metal part surface, rust-proof mechanism are antirust
Agent is dissolved in grease at micella, forms firm adsorbed film in metal surface, the hydrocarbon chain in anti-corrosive grease component, then with antirust agent
Mixing polymolecular layer is formed, to prevent the erosion of water and oxygen, prevents metal surface from getting rusty, is coated with anti-corrosion grease, outsourcing PE film
With the anchor pole of protective sheath, there is dual anti-corrosion ability.
It is transportation and packing stretch wrap film, the regulation of Ying Fuhe BB/T 0024, with wrapping machine to anchor pole that PE, which winds film 13,
The 1 intermediate position L3 for being located inside wind power generating set carries out the cladding of PE winding film 13, and the thickness of PE winding film 13 is not less than
25μm.Stretch wrap film is at normal temperature, to stretch generated deformation by force using mechanical tensioning devices or by hand by film and answer
Cargo is wrapped a kind of packaging film for being readily transported, storing by power.Stretch package saves raw material than shrink-wraping, and does not need
Thermal shrinking package machine saves the energy.Stretch wrap film has tensile property good, and tear-resistant, penetration-resistant is strong, and transparency is high, from
The features such as sticky good and relaxation shrinkage is high, and packaging is close, will not be loose, effectively can be wrapped in anchor rod body for anti-corrosion grease
On.
PE is wound film 13 and is coated using the method for spiral winding, facilitates large-scale industrial production, special winding can be used and set
Standby to be rapidly completed, cladding degree of overlapping is not less than 50%, it can be ensured that anti-corrosion grease reliably wraps up.
The material of PE pipe 11 is polyvinyl resin, and the gap between PE pipe 11 and anchor bolt 1 is not less than 1mm, 11 wall thickness of PE pipe
It not less than 3mm, can effectively completely cut off concrete, not influence anchor pole later period stretching construction.
The material of interim protective cap 14 is polyvinyl resin, and wall thickness is not less than 0.5mm, interim protective cap rain-proof, it is moisture-proof,
Mould proof, antirust avoids 1 both ends screw thread colliding in transhipment, transport, installation, work progress of anchor bolt, can also prevent grease from expanding
It dissipates, plays interim antisepsis.
The coating layer thickness of Dacroment preservative treatment is not less than 8 μm, and coating is zinc-chromium coating, is added simultaneously based on metal zinc metal sheet
Enter the high dispersive water soluble paint that aluminium flake, chromic acid, deionized water make solvent, coating is stained on metallic matrix, follows by fully closed road
Ring coating baking, forms very thin coating, Dacromet/steel successfully resists the erosion of chloride ion, and the resistance to neutral salt spray time is reachable
500 to 1000 hours.
The outer layer of thermal contraction casing tube 20 is cross-linked polyethylene resin, and internal layer is hot melt property adhesive, and wall thickness is not less than
0.5mm, temperature resistant range are -55 DEG C~105 DEG C, 115 DEG C of shrinkage temperature or more, have good cementability to metal and PE pipe
Can, it can be to avoid the corrosion at 1 both ends of anchor pole and 9 contact site of concrete 10 and high-strength grout.
Waterproof silicone grease is made of organosiloxane thickening high-purity inorganic thickening agent, is translucent body of paste, temperature resistant range
It is -60 DEG C~280 DEG C, there is good waterproof seal, high and low temperature, inoxidizability, it may have good mechanical stability
And colloid stability, the disassembly and installation in later period is not influenced.
As depicted in figs. 11-12,18 top of head protector is tubular construction, and lower part is hexagonal tubular construction, and bottom turns up to be formed
Skirt border structure, hexagonal tubular construction inner wall are adjacent to nut outer wall, and material is methyl vinyl silicone rubber, and wall thickness is not less than 2mm, adopts
With injection molded, temperature resistant range is -50 DEG C~250 DEG C.Silicon rubber has good high temperature resistant, low temperature, oil resistance, is able to satisfy
Outdoor use condition severe all the year round.
Major Diam is 42mm other than below, and for length is the anchor component of 3200mm, preparation process is as follows:
1. 42CrMoA round steel bar and as desired scale or multiple length is selected to roll corresponding length as blank, charge length one
As be 3190mm, diameter specifications be 39 ± 0.3mm of Φ, blank curvature be less than 2mm/m, overall length curvature is less than 0.1%；
2. carrying out alignment processing to blank using straightener, surface scale, both ends chamfered edge are removed, chamfer dimesion is C3~C5；
3. carrying out ultrasound+leakage field joint flaw detection to blank using defectoscope, ultrasonic inspection is for detecting material internal defect, leakage field
For detecting System of Detecting Surface Defects For Material, surface quality grades are that ultrasonic inspection is A grades for flaw detection, and magnetic leakage detection is 3 grades, and eddy current inspection is
6 grades, magnetic powder inspection is I grades；
4. being heat-treated to blank, mid-frequency induction hardening is carried out using intermediate frequency furnace, hardening heat is 830 DEG C, cooling side
Formula is water cooling, is tempered using Whole fiber well formula tempering furnace, and tempering temperature is 65 DEG C, soaking time 8h, hard after heat treatment
Degree is 25~30HRC；
5. carrying out alignment processing to blank and removing surface scale, the bolt diameter specification after alignment is 39 ± 0.3mm of Φ, base
Expect that curvature is less than 2mm/m, overall length curvature is less than 0.1%；
6. carrying out vortex using defectoscope to blank or magnetic powder inspection being handled, vortex or magnetic powder inspection are used to detection material surface
Defect, eddy current inspection are 6 grades, and magnetic powder inspection is I grades；
7. rolling circular thread, screw pitch 6.35mm, a height of 2.5mm of tooth at workpiece both ends by screw-rolling machine, Major Diam is
41.5mm, thread form angle θ1It is 60 °, rolling, which finishes rock-bolt length, becomes 3200mm；
8. carrying out preservative treatment to anchor bolt, anchor bolt 1 uses following preservative treatment measure, and 1 overall length of anchor bolt applies anti-corrosive grease, middle part
PE pipe, the PE pipe both ends heat shrinking sleeve seal of tube, threaded upper ends position L1, lower thread are worn again with PE winding film cladding at the L3 of position
Interim protective cap 14 is set at the L2 of position.
The preparation method of circular thread nut 2 the following steps are included:
1. selection 35CrMoA round steel bar carries out blanking to predetermined size with sawing machine, diameter specifications are Φ 45mm, and length is
102mm；
2. blank is selected to carry out forging molding punching according to nut outer dimension, nut diagonal distance e is 74mm, opposite side distance s
For 65mm, height dimension 52mm, blanking inner hole is Φ 36mm；
3. three-jaw clamps, make height of nut size m 48mm, interior hole Φ 37.5mm, chamfering C2 with lathe face work；
4. with the threaded circular thread internal screw thread of screw tap, diameter of thread be Φ 37.5mm, pitch P 6.35mm, a height of 2.2mm of tooth,
Thread form angle θ2It is 60 °；
5. being heat-treated with vacuum drying oven to workpiece, hardening heat is 830 DEG C, and the type of cooling is water cooling, tempering temperature 670
DEG C, soaking time 4h, hardness is 22~27HRC after heat treatment；
6. carrying out preservative treatment to nut 2, using Dacroment or zincizing preservative treatment, coating layer thickness is not less than 8 μm.
The structural parameters comparison of circular thread and regular screw threads of the invention is as shown in table 1, identical Major Diam specification
Threaded connection pair, the two stress area and bearing capacity are almost the same, and circular thread is somewhat larger, since circular thread uses big spiral shell
Away from non-wide transverse tooth thickness, be not only effectively reduced stress concentration, improve fatigue behaviour, axial fit clearance is big, processing and manufacturing
It more easily realizes, processing cost is lower, and advantage is fairly obvious in the big specification threaded connection pair application of M36 or more specification.?
With the screw thread bearing capacity of same specification it is comparable under the premise of, two kinds of helicitic texture parameters, through test and verifying repeatedly, load
Optimum state can be belonged to processing performance.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those skilled in the art,
Without depart from that overall concept of the invention, several changes and improvements can also be made, these also should be considered as of the invention
Protection scope.
Claims (9)
1. a kind of wind power generating set preparation method of circular thread anchor component, the circular thread anchor component, including anchor
Mutually matched inside and outside circular thread is provided on bolt (1) and nut (2), anchor bolt (1) and nut (2), it is characterised in that:
The preparation method of the anchor bolt (1) the following steps are included:
11) round steel bar and as desired scale or multiple length is selected to roll corresponding length as blank；
12) alignment processing, both ends chamfered edge are carried out to blank using straightener；
13) ultrasound+leakage field joint flaw detection is carried out to blank using defectoscope；
14) blank is heat-treated；
15) alignment processing is carried out to blank and removes surface scale；
16) vortex is carried out to blank using defectoscope or magnetic powder inspection is handled；
17) circular thread is rolled at workpiece both ends by screw-rolling machine, obtains anchor bolt；
18) preservative treatment is carried out to anchor bolt；
The preparation method of the nut (2) the following steps are included:
21) select round steel bar that sawing machine is used to carry out blanking to predetermined size as blank；
22) forging molding punching is carried out to blank according to nut outer dimension；
23) lathe face work and inner hole, chamfering are used；
24) the threaded circular thread internal screw thread of screw tap is used；
25) workpiece is heat-treated with vacuum drying oven, obtains nut；
26) preservative treatment is carried out to nut.
2. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
For the diameter tolerance of blank described in step 13) and step 16 in the range of ± 0.3mm, blank curvature is less than 2mm/m, always
Long curvature is less than 0.1%；Surface quality grades are that ultrasonic inspection is A grades, and magnetic leakage detection is 3 grades, and eddy current inspection is 6 grades, magnetic powder
Flaw detection is I grade.
3. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
Heat treatment described in step 14) includes quenching and tempering, mid-frequency induction hardening is carried out using intermediate frequency furnace, using Whole fiber well
Formula tempering furnace is tempered.
4. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
The inside and outside circular thread is the connection screw thread of face contact, and the continuous circular arc screw thread in anchor bolt (1) is external screw thread, by upper tooth tip circle
Arc (3), straightway (4), lower tooth bottom circular arc (5), straightway (4) are sequentially connected composition, the radius and lower tooth of upper tooth tip circle arc (3)
The radius of bottom circular arc (5) is equal, and straightway (4) is tangent with upper tooth tip circle arc (3), lower tooth bottom circular arc (5) respectively；On nut (2)
Continuous circular arc screw thread be internal screw thread, be sequentially connected and formed by upper half circular arc (6), tangential straightway (7), crest (8), crest
It (8) is plane, tangential straightway (7) and upper half circular arc (6) are tangent, and the height of nut (2) is at least 7.5 times of screw pitch；Screw thread connects
Connecing secondary is non-wide transverse tooth thickness, and external screw thread transverse tooth thickness is greater than internal screw thread transverse tooth thickness, and external screw thread thread form angle is equal with internal screw thread thread form angle.
5. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
The stress sectional area of the circular thread anchor component is 1120mm2, screw pitch 6.35mm, external screw thread major diameter is 41.5mm, outside
The pitch diameter of thread is 39mm, and external screw thread path is 36.5mm, and a height of 2.5mm of external screw thread tooth, upper radius of rounded crest is 1.5mm, under
Radius of rounded root is 1.5mm, and internal screw thread path is 37.5mm, a height of 2.2mm of internal screw thread tooth；Nut diagonal distance is 74mm,
Nut opposite side distance is 65mm, and height of nut 48mm, external screw thread thread form angle and internal screw thread thread form angle are 60 °.
6. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
The stress sectional area of the circular thread anchor component is 1474mm2, screw pitch 8.5mm, external screw thread major diameter is 48.3mm, outer spiral shell
Line central diameter is 45mm, and external screw thread path is 41.7mm, and a height of 3.3mm of external screw thread tooth, upper radius of rounded crest is 2.0mm, lower tooth
Bottom arc radius is 2.0mm, and internal screw thread path is 43.5mm, a height of 2.8mm of internal screw thread tooth；Nut diagonal distance is 80mm, spiral shell
Female opposite side distance is 70mm, and height of nut 64mm, external screw thread thread form angle and internal screw thread thread form angle are 60 °.
7. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
The method that preservative treatment is carried out to anchor bolt in step 18 are as follows: anchor pole (1) overall length applies anti-corrosive grease, and anchor pole (1) is located at wind-power electricity generation
Intermediate position (L3) inside unit winds film (13) cladding with PE, then the intermediate position (L3) of PE winding film (13) cladding is worn
PE manages (11), and PE manages (11) both ends and sealed with thermal contraction casing tube (15), the both ends that anchor pole (1) is not coated by PE winding film (13)
Interim protective cap (14) are set.
8. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
The method that preservative treatment is carried out to nut in step 26) are as follows: nut (2) uses Dacroment or zincizing preservative treatment, resistance to neutral salt
The mist time is not less than 1000 hours.
9. the wind power generating set according to claim 1 preparation method of circular thread anchor component, it is characterised in that:
The strength grade of the anchor bolt is 8.8 grades, and material is 42CrMoA or 35CrMoA, it is specified that plastic elongation intensity Rp0.2≥
660MPa, tensile strength Rm >=830MPa, elongation after fracture >=12%, anchor bolt hardness range 25-30HRC, anchor bolt surface and center portion
The ballistic work average value KV of difference of hardness control three samples in 2HRC, -40 DEG C2≥60J；Nut strength grade is 8 grades, material
For 42CrMoA or 35CrMoA, hardness 22-27HRC.
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| CN112427949A (en) * | 2020-11-10 | 2021-03-02 | 青岛天能重工股份有限公司 | Stock automated production assembly line |
| CN112681302A (en) * | 2020-12-16 | 2021-04-20 | 深圳钜联锚杆技术有限公司 | Anchor rod neck protection assembly, anchor rod and construction method |
| CN113420394A (en) * | 2021-07-14 | 2021-09-21 | 中船重工海为郑州高科技有限公司 | Design method of arc threaded connection pair |
| CN116877555A (en) * | 2023-06-05 | 2023-10-13 | 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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| CN113420394A (en) * | 2021-07-14 | 2021-09-21 | 中船重工海为郑州高科技有限公司 | Design method of arc threaded connection pair |
| CN113420394B (en) * | 2021-07-14 | 2022-10-11 | 中船重工海为郑州高科技有限公司 | Design method of arc threaded connection pair |
| CN116877555A (en) * | 2023-06-05 | 2023-10-13 | 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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