CN103452986A - Light anti-fatigue self-locking nut and manufacture method thereof - Google Patents
Light anti-fatigue self-locking nut and manufacture method thereof Download PDFInfo
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- CN103452986A CN103452986A CN2013103444796A CN201310344479A CN103452986A CN 103452986 A CN103452986 A CN 103452986A CN 2013103444796 A CN2013103444796 A CN 2013103444796A CN 201310344479 A CN201310344479 A CN 201310344479A CN 103452986 A CN103452986 A CN 103452986A
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Abstract
The invention discloses a light anti-fatigue self-locking nut comprising a nut body provided with inner screws. The nut body comprises a screwing segment and a bearing segment. A neck breaking groove is formed between the screwing segment and the bearing segment. A relieving groove is formed inside the screwing segment along the length direction of the nut body. The invention further discloses a method for manufacturing the light anti-fatigue self-locking nut. The method includes utilizing a forging, a bar and a plate as base material of the self-locking nut to form the nut body and the relieving groove directly in manners of molding or forging. The base material of the self-locking nut is high temperature alloy, titanium alloy, high strength steel or ultrahigh-strength steel. The light anti-fatigue self-locking nut is simple in structure, high in safety and reliability, convenient to maintain, and is simple in manufacture process, and capable of controlling pretightening force, reducing the weight of the self-locking nut by 40%, and reducing the weight by 1-1.5% of the total weight of an airplane in the aspect of fixing part nut connection, and great contribution is provided to load capacity of the airplane.
Description
Technical field
The invention belongs to and be fastenedly connected technical field, relate to a kind of light antifatigue self-locking nut and manufacture method thereof
Background technique
At present, in the aircraft parts design, multifunctionality, the high-end fastener technology of minimize weight requires high, and expensive.Especially the temperature high performance high fastening piece of motor class is few, the manufacture difficulty super large.Along with the development of modern science and technology, raw-material performance is improving greatly, and especially impurity reduces, strength increase, and plasticity enhancing and property etc., the crystal grain of some special forging becomes elongated linearity, and crystal grain is uninterrupted, and its fatigability improves greatly.Yet weight is a parameter of fastening piece most critical, especially on aircraft, the minimize weight of fastening piece used is a maximum puzzlement all the time.On aerospace vehicle, overweight is all undesirable.A Medium Plane can reach 2～300 ten thousand with various types of fastening pieces, and the gross weight of present generation aircraft fastening piece used accounts for 6% of aircraft gross weight, and wherein nut accounts for 2% of gross weight.For realizing as far as possible the minimize weight of fastening piece in aircraft parts, various self-locking nuts have appearred at present on the market, but these nuts are mostly to reach by reducing this health of nut the purpose that reduces weight, therefore in assurance, reach on the basis of usability, the weight saving of existing self-locking nut is unsatisfactory, and the pretightening force of existing self-locking nut is uncontrollable simultaneously.Therefore how realizing the self-locking nut minimize weight, the self-locking nut pretightening force can be controlled, is current relevant enterprise circle problem demanding prompt solution.
Summary of the invention
In order to address the above problem, the invention provides a kind of light antifatigue self-locking nut and manufacture method thereof.
The present invention is achieved by following technical solution.
A kind of light antifatigue self-locking nut, comprise the nut body with internal thread, and described nut body is comprised of twisting section and carrying section, between twisting section and carrying section, is provided with cut-off neck slot, at the twisting intersegmental part, along the nut body length direction, is provided with and alleviates groove.
Described twisting section comprises outer twisting face and interior twisting face, and the section configuration of its China and foreign countries' twisting face is for circle, annular knurl shape or be 3～12 limit shapes.
The described groove that alleviates is for a circular groove being comprised of inner side surface, interior twisting face and bottom, wherein bottom and cut-off neck slot by the one side of carrying section on same plane.
Described inner side surface is circular, and interior twisting face is circle or polygonal, and is provided with 1～6 lateral extrusion point at the inside hand of spiral in the middle part of inner side surface.
The described cross section that alleviates groove is rectangle.
The described cross section that alleviates groove is triangle or wedge shape.
Described carrying section is provided with supporting surface, is provided with profile of tooth, plane or step on supporting surface.
As another object of the present invention, the invention provides a kind of method of manufacturing above-mentioned self-locking nut, the method is directly by mold pressing or forging and stamping, to form self-locking nut, mainly comprises following method step:
A, manufacture nut body and alleviate groove: according to the specification of self-locking nut to be processed, utilize forging, bar or sheet material to become nut body and alleviate groove as the direct mold pressing of the base material of self-locking nut or forging forming;
B, until the described nut body of step a and alleviate that channel mould is pressed or forging forming after, process successively outer twisting face, cut-off neck slot and supporting surface for the specification of above-mentioned self-locking nut;
C, after twisting face, cut-off neck slot and supporting surface outside the described processing successively of step b, Screw thread process method machining internal thread routinely;
D, after the described Screw thread process method routinely of step c machining internal thread, carry out 1～6 extrusion-deformation at the inside hand of spiral in the middle part of the inner side surface that alleviates groove.
In described step a, the substrate material of self-locking nut is refractory alloy, titanium alloy, high tensile steel or Ultrastrength Steel.
In described step a, the number of times of mold pressing or forging and stamping is 3～6 times.
The invention has the beneficial effects as follows:
Compared with prior art, the present invention is on the basis that does not reduce plain nut structural strength and fatigue resistance, by the optimization to nut structure shape and manufacturing process, arrange and alleviate groove and cut-off neck slot on self-locking nut, in use, by the twisting face with spanner twisting self-locking nut, when reaching predetermined installation pretightening force value, the twisting section be arranged on nut is just broken from cut-off neck slot, greatly reduce the weight of self-locking nut, thereby realize the minimize weight of self-locking nut in the situation that guarantees controlled pretightening force.Adopt self-locking nut of the present invention, self-locking nut weight can be reduced to 40% original left and right, just can alleviate 1～1.5% the weight that is equivalent to the aircraft gross weight aspect the fastener nut connection, to the lifting capacity of aircraft, very large contribution will be arranged.Can regulate to the distance of interior twisting face the pretightening force that control needs by changing on nut body the bottom that connects the cut-off neck slot between twisting section and carrying section simultaneously, to meet different usage requirements of installing under operating mode, reach the controllable purpose of pretightening force.The present invention is by adopting refractory alloy, titanium alloy, the material mold pressing of the high-tech such as high tensile steel or Ultrastrength Steel or forging forming, because intensity and the plasticity of these materials are fabulous, its crystal grain does not fracture and forms the wire of prolate after mold pressing or forging forming, be that grain flow line is evenly complete, greatly strengthen its tensile strength and fatigue strength after the material flow harden.The present invention is simple in structure, and pretightening force can be controlled, and safety reliability is high, easy to maintenance, and manufacturing process is simple and direct, can be in aircraft link technical field wide popularization and application such as Aeronautics and Astronautics.
The accompanying drawing explanation
Fig. 1 is embodiments of the invention one structural representations;
The sectional structure schematic diagram that Fig. 2 is Fig. 1;
Fig. 3 is embodiments of the invention two structural representations;
The sectional structure schematic diagram that Fig. 4 is Fig. 3;
Fig. 5 is embodiments of the invention three structural representations;
The sectional structure schematic diagram that Fig. 6 is Fig. 5;
Fig. 7 is Application Example schematic diagram of the present invention.
In figure: 1-twisting section, 2-alleviates groove, the 3-internal thread, the 4-cut-off neck slot, 5-carries section, 6-nut body, 7-plate A to be connected, 8-plate B to be connected, 9-construction bolt, the outer twisting face of 101-, twisting face in 102-, 201-inner side surface, 501-supporting surface.
Embodiment
Further describe technological scheme of the present invention below in conjunction with accompanying drawing, but that claimed scope is not limited to is described.
As shown in Figures 1 to 6, a kind of light antifatigue self-locking nut of the present invention, comprise the nut body 6 with internal thread 3, described nut body 6 is comprised of twisting section 1 and carrying section 5, be provided with cut-off neck slot 4 between twisting section 1 and carrying section 5, in twisting section 1 inside, along nut body 6 length directions, be provided with and alleviate groove 2.
Described twisting section 1 comprises outer twisting face 101 and interior twisting face 102, and the section configuration of its China and foreign countries' twisting face 101 is for circle, annular knurl shape or be 3～12 limit shapes.
Described groove 2 circular groove for being comprised of inner side surface 201, interior twisting face 102 and bottom that alleviates, wherein bottom and cut-off neck slot 4 are by carrying sections 5 one side on same plane.In actual use, the twisting face 101 with spanner twisting self-locking nut, until twisting section 1 is twisted into two parts from cut-off neck slot 4, can reach predetermined installation pretightening force value like this, can greatly alleviate the weight of self-locking nut simultaneously.Due to the bottom that alleviates groove 2 and cut-off neck slot 4 by the one side of carrying section 5 on same plane, make twisting section 1 not affect use and the appearance quality of self-locking nut by switch out the time.
Described inner side surface 201 is circular, and interior twisting face 102 is circle or polygonal, and is provided with 1～6 lateral extrusion point at the middle part of inner side surface 201 to internal thread 3 directions.So during fabrication can be at the middle part of inner side surface 201 to internal thread 3 directions 1～6 extrusion-deformations, make the part material convex of its internal thread 3 and change the central diameter size of internal thread 3, thereby realizing auto-lock function.
The described cross section that alleviates groove 2 is rectangle.As shown in Figure 2, Figure 4 shows, the shape that at this moment alleviates groove 2 can be the cylinder groove of an annular, can be also the circular groove of inner circle foreign side.
The described cross section that alleviates groove 2 is triangle or wedge shape.At this moment the shape that alleviates groove 2 just forms the frustoconic shape groove of an annular, and it is leg-of-mutton structure that Fig. 2 shows the cross section that alleviates groove 2.
Described carrying section 5 is provided with supporting surface 501, is provided with profile of tooth, plane or step on supporting surface 501.In actual applications, supporting surface 501 can also be arranged to other arbitrary shapes, as long as and Matrix Match.
The present invention, by utilizing modern high technology material and manufacturing process, overturns old-fashioned and inflexible anchor design style drawing, has solved the large problem of weight in the puzzlement Flight Vehicle Design.Improve fatigability simultaneously, increase reliability.Controlled pretightening force is good, and safety reliability is high, easy to maintenance.
As shown in Figure 7, light antifatigue self-locking nut of the present invention is when using, after first construction bolt 9 being passed to the mounting hole of plate 7A to be connected and plate 8B to be connected, be screwed in the internal thread 3 of self-locking nut of the present invention, and then self-locking nut is tightened by twisting face 101 with spanner, until spanner is twisted into two parts twisting section 1 from cut-off neck slot 4.Can not only reach so predetermined installation pretightening force value, also greatly alleviate the weight of self-locking nut.
As another object of the present invention, the invention provides a kind of method of manufacturing above-mentioned self-locking nut, the method is directly by mold pressing or forging and stamping, to form self-locking nut, mainly comprises following method step:
A, manufacture nut body 1 and alleviate groove 2: according to the specification of self-locking nut to be processed, utilizing forging, bar or sheet material to become nut body 1 and alleviate groove 2 as the direct mold pressing of the base material of self-locking nut or forging forming; Nut body 1 and alleviate the groove direct mold pressing of 2 one or excellent suitability for press forming, guaranteed that inner side surface 201 does not fracture and to form the wire of prolate to the crystal grain of internal thread 3 part materials after mold pressing or forging forming, be that grain flow line is evenly complete, greatly strengthen its tensile strength and fatigue strength after the material flow harden.
B, until the described nut body 1 of step a with after alleviating groove 2 mold pressings or forging forming, process successively outer twisting face 101, cut-off neck slot 4 and supporting surface 501 for the specification of above-mentioned self-locking nut;
C, until twisting face 101 outside the described processing successively of step b,, after cut-off neck slot 4 and supporting surface 501, the Screw thread process method machining internal thread 3 routinely;
D, after the described Screw thread process method routinely of step c machining internal thread 3, carry out 1～6 extrusion-deformation at the middle part of the inner side surface 201 that alleviates groove 2 to internal thread 3 directions.1～6 extrusion-deformation is carried out to internal thread 3 directions in middle part at the inner side surface 201 that alleviates groove 2.Make like this part material convex of its internal thread 3 and change the central diameter size of internal thread 3, thereby realizing auto-lock function.The quantity of extrusion-deformation point can be determined according to self-locking nut specification to be processed.
In described step a, the substrate material of self-locking nut is refractory alloy, titanium alloy, high tensile steel or Ultrastrength Steel.Adopt above-mentioned advanced person's hitech materials, intensity and the plasticity of material are fabulous, and its crystal grain does not fracture and forms the wire of prolate after mold pressing or forging forming, and grain flow line is evenly complete, greatly strengthens its tensile strength and fatigue strength after the material flow harden.In Practical manufacturing, the base material of self-locking nut can adopt other special steel grades, as long as the intensity of material is greater than 1100MPa and plasticity is fabulous, all can.The present invention is when material selection, and the design parameter at material plasticity place is: specific elongation δ>=8; Reduction of cross sectional area ψ>=12; Ballistic work α
κ>=250.
In described step a, the number of times of mold pressing or forging and stamping is 3～6 times.Need to reach 70% amount of deformation due to the self-locking nut that adopts the above-mentioned material manufacture and just there is good high-temperature behavior.And heating-up temperature is carried out between 800 ℃ to 1600 ℃ degree while forging, so only have through mold pressing or forging and stamping repeatedly, high cycle fatigue, low cycle fatigue, the mechanical propertys such as high temperature endurance performance and high temperature tension could meet, making tensile strength is that 1100MPa is to 2100MPa, most of material all at 1380MPa between 1500MPa, safety coefficient is preferably between 5 to 12.
In actual applications, in order effectively to control the pretightening force of light antifatigue self-locking nut, at first according to the needed pretightening force when tightening of this self-locking nut in air equipment, then arrive the distance of interior twisting face by the bottom that changes cut-off neck slot, this light antifatigue self-locking nut is installed to the forcemeter that can survey pretightening force, can extrapolate the bottom of cut-off neck slot to the distance of interior twisting face and the function relation between pretightening force, thereby realize controlled pretightening force.
Claims (10)
1. a light antifatigue self-locking nut, comprise the nut body (6) with internal thread (3), it is characterized in that: described nut body (6) is comprised of twisting section (1) and carrying section (5), be provided with cut-off neck slot (4) between twisting section (1) and carrying section (5), in twisting section (1) inside, along nut body (6) length direction, be provided with and alleviate groove (2).
2. a kind of light antifatigue self-locking nut according to claim 1, it is characterized in that: described twisting section (1) comprises outer twisting face (101) and interior twisting face (102), and the section configuration of its China and foreign countries' twisting faces (101) is for circle, annular knurl shape or be 3～12 limit shapes.
3. a kind of light antifatigue self-locking nut according to claim 1, it is characterized in that: the described groove (2) that alleviates is for a circular groove being comprised of inner side surface (201), interior twisting face (102) and bottom, wherein bottom and cut-off neck slot (4) by the one side of carrying section (5) on same plane.
4. a kind of light antifatigue self-locking nut according to claim 3, it is characterized in that: described inner side surface (201) is for circular, interior twisting face (102) is circle or polygonal, and is provided with 1～6 lateral extrusion point at the middle part of inner side surface (201) to internal thread (3) direction.
5. a kind of light antifatigue self-locking nut according to claim 1, it is characterized in that: the described cross section that alleviates groove (2) is rectangle.
6. a kind of light antifatigue self-locking nut according to claim 1, it is characterized in that: the described cross section that alleviates groove (2) is triangle or wedge shape.
7. a kind of light antifatigue self-locking nut according to claim 1 is characterized in that: described carrying section (5) is provided with supporting surface (501), on supporting surface (501), is provided with profile of tooth, plane or step.
8. the method for the manufacture of light antifatigue self-locking nut as described as any one in claim 1～6, the method is directly by mold pressing or forging and stamping, to form self-locking nut, it is characterized in that: mainly comprise following method step:
A, manufacture nut body (1) and alleviate groove (2): according to the specification of self-locking nut to be processed, utilizing forging, bar or sheet material to become nut body (1) and alleviate groove (2) as the direct mold pressing of the base material of self-locking nut or forging forming;
B, until the described nut body of step a (1) with after alleviating groove (2) mold pressing or forging forming, process successively outer twisting face (101), cut-off neck slot (4) and supporting surface (501) for the specification of above-mentioned self-locking nut;
C, after twisting face (101), cut-off neck slot (4) and supporting surface (501) outside the described processing successively of step b, Screw thread process method machining internal thread (3) routinely;
D, after the described Screw thread process method routinely of step c machining internal thread (3), carry out 1～6 extrusion-deformation at the middle part of the inner side surface that alleviates groove (2) (201) to internal thread (3) direction.
9. a kind of method of manufacturing light antifatigue self-locking nut according to claim 8, it is characterized in that: in described step a, the substrate material of self-locking nut is refractory alloy, titanium alloy, high tensile steel or Ultrastrength Steel.
10. a kind of method of manufacturing light antifatigue self-locking nut according to claim 8, it is characterized in that: in described step a, the number of times of mold pressing or forging and stamping is 3～6 times.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310344479.6A CN103452986B (en) | 2013-08-08 | 2013-08-08 | A kind of light antifatigue self-locking nut and manufacture method thereof |
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| CN201310344479.6A CN103452986B (en) | 2013-08-08 | 2013-08-08 | A kind of light antifatigue self-locking nut and manufacture method thereof |
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| CN103452986A true CN103452986A (en) | 2013-12-18 |
| CN103452986B CN103452986B (en) | 2015-11-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121267A (en) * | 2014-08-08 | 2014-10-29 | 贵州航天精工制造有限公司 | Sealing self-locking nut assembly and manufacturing method |
| CN105889281A (en) * | 2016-06-07 | 2016-08-24 | 贵州航天精工制造有限公司 | Making method of constant-force self-locking nuts and constant-force self-locking nuts |
| CN107322236A (en) * | 2017-06-22 | 2017-11-07 | 贵州精立航太科技有限公司 | A kind of processing technology of high temperature supporting plate self-lock nut |
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| DE10326005A1 (en) * | 2003-06-10 | 2004-12-30 | Volkswagen Ag | Tear-off nut for non-detachable screw connection e.g. in vehicles has frusto-conical threaded part with smaller diameter end connected to nut head to form ideal break point |
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| CN203453245U (en) * | 2013-08-08 | 2014-02-26 | 贵州航天精工制造有限公司 | Light-weight anti-fatigue self-locking nut |
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| CN1087848A (en) * | 1992-12-09 | 1994-06-15 | 沈阳市高压螺栓厂 | The manufacture method of high strength nut |
| CN2381830Y (en) * | 1998-10-25 | 2000-06-07 | 骆长虹 | Hydraulic nut |
| DE10326005A1 (en) * | 2003-06-10 | 2004-12-30 | Volkswagen Ag | Tear-off nut for non-detachable screw connection e.g. in vehicles has frusto-conical threaded part with smaller diameter end connected to nut head to form ideal break point |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121267A (en) * | 2014-08-08 | 2014-10-29 | 贵州航天精工制造有限公司 | Sealing self-locking nut assembly and manufacturing method |
| CN105889281A (en) * | 2016-06-07 | 2016-08-24 | 贵州航天精工制造有限公司 | Making method of constant-force self-locking nuts and constant-force self-locking nuts |
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| CN107322236B (en) * | 2017-06-22 | 2019-09-17 | 贵州精立航太科技有限公司 | A kind of processing technology of high temperature supporting plate self-lock nut |
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| CN103452986B (en) | 2015-11-04 |
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