CN103452986B - A kind of light antifatigue self-locking nut and manufacture method thereof - Google Patents
A kind of light antifatigue self-locking nut and manufacture method thereof Download PDFInfo
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- CN103452986B CN103452986B CN201310344479.6A CN201310344479A CN103452986B CN 103452986 B CN103452986 B CN 103452986B CN 201310344479 A CN201310344479 A CN 201310344479A CN 103452986 B CN103452986 B CN 103452986B
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Abstract
The invention discloses a kind of light antifatigue self-locking nut, comprise the female nut body of band, described nut body is made up of twisting section and carrying section, between twisting section and carrying section, be provided with cut-off neck slot, to be provided with to alleviate groove at twisting intersegmental part along nut body length direction; The invention also discloses a kind of method for the manufacture of light antifatigue self-locking nut, the method utilizes forging, bar or sheet material become nut body as the direct mold pressing of base material of self-locking nut or forging forming and alleviate groove, and the substrate material of described self-locking nut is refractory alloy, titanium alloy, high tensile steel or Ultrastrength Steel.Structure of the present invention is simple, pretightening force can control, safety reliability is high, easy to maintenance, manufacturing process is simple and direct, self-locking nut weight can be reduced to original about 40%, just can alleviate in fastener nut connection be equivalent to aircraft gross weight 1 ~ 1.5% weight, will very large contribution be had to the lifting capacity of aircraft.
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 aircraft parts design, multi-functional, 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, manufacture difficulty super large.Along with the development of modern science and technology, raw-material performance is improving greatly, and especially impurity reduces, and intensity increases, and plasticity enhancing and property etc., the crystal grain of some special forging becomes elongate linear, and crystal grain is uninterrupted, and its fatigability improves greatly.But weight is a parameter of fastening piece most critical, the minimize weight of fastening piece used is a maximum puzzlement all the time especially on board the aircraft.On aerospace vehicle, overweight is all undesirable.The various types of fastening piece of one frame Medium Plane can reach 2 ~ 300 ten thousand, 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 the minimize weight of fastening piece in aircraft parts as far as possible, there is various self-locking nut on the market at present, but these nuts are mostly reach by reducing this health of nut the object reducing weight, therefore reach on the basis of usability in guarantee, 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 self-locking nut minimize weight, self-locking nut pretightening force can be controlled, is current relevant enterprise circle problem demanding prompt solution.
Summary of the invention
In order to solve the 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, comprises the female nut body of band, and described nut body is made up of twisting section and carrying section, between twisting section and carrying section, be provided with cut-off neck slot, to be provided with to alleviate groove at twisting intersegmental part along nut body length direction.
Described twisting section comprises outer twisting face and interior twisting face, and the section configuration in its twisting face, China and foreign countries be circular, annular knurl shape or is 3 ~ 12 limit shapes.
The described groove that alleviates is the circular groove be made up of inner side surface, interior twisting face and bottom, and wherein bottom and cut-off neck slot are by carrying the one side of section in same plane.
Described inner side surface is circular, and interior twisting face is circular or polygonal, and the inside hand of spiral in the middle part of inner side surface is provided with 1 ~ 6 lateral extrusion point.
The described cross section alleviating groove is rectangle.
The described cross section alleviating groove is triangle or wedge shape.
Described carrying section is provided with supporting surface, is provided with profile of tooth, plane or step on the support surface.
As another object of the present invention, the invention provides a kind of method manufacturing above-mentioned self-locking nut, the method directly forms self-locking nut by mold pressing or forging and stamping, mainly comprises following method step:
A, manufacture nut body and alleviate groove: according to the specification of self-locking nut to be processed, utilizing forging, bar or sheet material become nut body as the direct mold pressing of base material of self-locking nut or forging forming and alleviate groove;
B, until the nut body described in step a and alleviate channel mould pressure or forging forming after, the specification for above-mentioned self-locking nut processes outer twisting face, cut-off neck slot and supporting surface successively;
C, after the outer twisting face of the processing successively described in step b, cut-off neck slot and supporting surface, Screw thread process method machining internal thread routinely;
D, after the machining internal thread of Screw thread process method routinely described in step c, carry out 1 ~ 6 extrusion-deformation at the inside hand of spiral in the middle part of the inner side surface alleviating groove.
In described step a, the substrate material of self-locking nut is refractory alloy, titanium alloy, high tensile steel or Ultrastrength Steel.
The number of times of mold pressing or forging and stamping in described step a is 3 ~ 6 times.
The invention has the beneficial effects as follows:
Compared with prior art, the present invention is on the basis not reducing plain nut structural strength and fatigue resistance, by the optimization to nut structure shape and manufacturing process, self-locking nut is arranged and alleviates groove and cut-off neck slot, 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, thus ensureing that the situation of controlled pretightening force realizes the minimize weight of self-locking nut.Adopt self-locking nut of the present invention, self-locking nut weight can be reduced to original about 40%, just can alleviate in fastener nut connection be equivalent to aircraft gross weight 1 ~ 1.5% weight, will very large contribution be had to the lifting capacity of aircraft.The pretightening force of regulable control needs can be carried out simultaneously by the distance of the bottom to interior twisting face that change nut body connect the cut-off neck slot between twisting section and carrying section, the usage requirement under operating mode is installed with satisfied difference, reaches the controllable object of pretightening force.The present invention is by adopting refractory alloy, titanium alloy, the mold pressing of the hitech materials such as high tensile steel or Ultrastrength Steel or forging forming, due to the intensity of these materials and plasticity fabulous, its crystal grain does not fracture and forms the wire of prolate after mold pressing or forging forming, namely grain flow line is evenly complete, greatly strengthens its tensile strength and fatigue strength after material flow harden.Structure of the present invention is simple, and pretightening force can control, and safety reliability is high, easy to maintenance, and manufacturing process is simple and direct, can in aircraft link technical field wide popularization and application such as Aeronautics and Astronautics.
Accompanying drawing explanation
Fig. 1 is embodiments of the invention one structural representations;
Fig. 2 is the sectional structure schematic diagram of Fig. 1;
Fig. 3 is embodiments of the invention two structural representations;
Fig. 4 is the sectional structure schematic diagram of Fig. 3;
Fig. 5 is embodiments of the invention three structural representations;
Fig. 6 is the sectional structure schematic diagram of Fig. 5;
Fig. 7 is Application Example schematic diagram of the present invention.
In figure: 1-twisting section, 2-alleviates groove, 3-internal thread, 4-cut-off neck slot, and 5-carries section, 6-nut body, 7-plate A, 8-to be connected plate B, 9-construction bolt to be connected, the outer twisting face of 101-, twisting face in 102-, 201-inner side surface, 501-supporting surface.
Embodiment
Technological scheme of the present invention is further described below in conjunction with accompanying drawing, but described in claimed scope is not limited to.
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 made up of twisting section 1 and carrying section 5, between twisting section 1 and carrying section 5, be provided with cut-off neck slot 4, be provided with along nut body 6 length direction in twisting section 1 inside and alleviate groove 2.
Described twisting section 1 comprises outer twisting face 101 and interior twisting face 102, and the section configuration in its twisting face 101, China and foreign countries be circular, annular knurl shape or is 3 ~ 12 limit shapes.
The described groove 2 that alleviates is the circular groove be made up of inner side surface 201, interior twisting face 102 and bottom, and wherein bottom and cut-off neck slot 4 are by carrying the one side of section 5 in same plane.In actual use, with the twisting face 101 of spanner twisting self-locking nut, till twisting section 1 being twisted into two parts from cut-off neck slot 4, predetermined installation pretightening force value can be reached like this, greatly can alleviate the weight of self-locking nut simultaneously.Owing to alleviating the bottom of groove 2 and cut-off neck slot 4 by carrying the one side of section 5 in same plane, make twisting section 1 not affected use and the appearance quality of self-locking nut during switch out.
Described inner side surface 201 is circular, and interior twisting face 102 is circular or polygonal, and at the middle part of inner side surface 201, internal thread 3 direction is provided with 1 ~ 6 lateral extrusion point.So during fabrication can 1 ~ 6 extrusion-deformation to internal thread 3 direction at the middle part of inner side surface 201, make the portion of material convex of its internal thread 3 and change the central diameter size of internal thread 3, thus realizing auto-lock function.
The described cross section alleviating groove 2 is rectangle.As shown in Figure 2, Figure 4 shows, the shape at this moment alleviating groove 2 can be an annular cylinder groove, also can be the circular groove of inner circle foreign side.
The described cross section alleviating groove 2 is triangle or wedge shape.At this moment alleviate the shape frustoconic shape groove that just formation one is annular of groove 2, it is leg-of-mutton structure that Fig. 2 shows the cross section alleviating groove 2.
Described carrying section 5 is provided with supporting surface 501, and supporting surface 501 is provided with profile of tooth, plane or step.In actual applications, supporting surface 501 can also be arranged to other arbitrary shapes, if with Matrix Match.
The present invention, by utilizing modern high technology material and manufacturing process, overturns old-fashioned and inflexible anchor design style drawing, solves the problem that in puzzlement Flight Vehicle Design, weight is large.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 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 tightened by self-locking nut by twisting face 101 with spanner, until twisting section 1 is twisted into two parts from cut-off neck slot 4 by spanner.Predetermined installation pretightening force value can not only be reached like this, also greatly alleviate the weight of self-locking nut.
As another object of the present invention, the invention provides a kind of method manufacturing above-mentioned self-locking nut, the method directly forms self-locking nut by mold pressing or forging and stamping, 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, utilize forging, bar or sheet material become nut body 1 as the direct mold pressing of base material of self-locking nut or forging forming and alleviate groove 2; Nut body 1 and alleviate groove 2 one directly mold pressing or excellent suitability for press forming, ensure that the crystal grain of inner side surface 201 to internal thread 3 portion of material does not fracture after mold pressing or forging forming and form the wire of prolate, namely grain flow line is evenly complete, greatly strengthens its tensile strength and fatigue strength after material flow harden.
B, until the nut body 1 described in step a with after alleviating groove 2 mold pressing or forging forming, the specification for above-mentioned self-locking nut processes outer twisting face 101, cut-off neck slot 4 and supporting surface 501 successively;
C, until the outer twisting face 101 of the processing successively described in step b, after cut-off neck slot 4 and supporting surface 501, Screw thread process method machining internal thread 3 routinely;
D, after the machining internal thread of Screw thread process method routinely 3 described in step c, carry out 1 ~ 6 extrusion-deformation at the middle part of the inner side surface 201 alleviating groove 2 to internal thread 3 direction.1 ~ 6 extrusion-deformation is carried out to internal thread 3 direction at the middle part of the inner side surface 201 alleviating groove 2.Make the portion of material convex of its internal thread 3 like this and change the central diameter size of internal thread 3, thus 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 the hitech materials of above-mentioned advanced person, 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 namely grain flow line is evenly complete, greatly strengthens its tensile strength and fatigue strength after material flow harden.In reality manufactures, 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.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.
The number of times of mold pressing or forging and stamping in described step a is 3 ~ 6 times.The amount of deformation reaching 70% is needed just to have good high-temperature behavior owing to adopting the self-locking nut of above-mentioned material manufacture.And heating-up temperature is carried out between 800 DEG C to 1600 DEG C degree when forging, so only have through mold pressing or forging and stamping repeatedly, high cycle fatigue, low cycle fatigue, the mechanical property such as high temperature endurance performance and elevated temperature tensile could meet, tensile strength is made to be 1100MPa to 2100MPa, major part material is all between 1380MPa to 1500MPa, and safety coefficient is preferably between 5 to 12.
In actual applications, in order to effectively control the pretightening force of light antifatigue self-locking nut, first according to the pretightening force that this self-locking nut in air equipment is required when tightening, then the distance of bottom to interior twisting face of change cut-off neck slot is passed through, this light antifatigue self-locking nut is installed the forcemeter can surveying pretightening force, the bottom of cut-off neck slot can be extrapolated to the function relation between the distance and pretightening force in interior twisting face, thus realize controlled pretightening force.
Claims (6)
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 made up of twisting section (1) and carrying section (5), between twisting section (1) and carrying section (5), be provided with cut-off neck slot (4), be provided with along nut body (6) length direction in twisting section (1) inside 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) be circular, annular knurl shape or is 3 ~ 12 limit shapes; The described groove (2) that alleviates is the circular groove be made up of inner side surface (201), interior twisting face (102) and bottom, and wherein bottom and cut-off neck slot (4) are by carrying the one side of section (5) in same plane; The manufacture method of this self-locking nut directly forms self-locking nut by mold pressing or forging and stamping, specifically comprises the steps:
A, manufacture nut body (1) and alleviate groove (2): according to the specification of self-locking nut to be processed, utilize forging, bar or sheet material become nut body (1) as the direct mold pressing of base material of self-locking nut or forging forming and alleviate groove (2);
B, until the nut body (1) described in step a with after alleviating groove (2) mold pressing or forging forming, the specification for above-mentioned self-locking nut processes outer twisting face (101), cut-off neck slot (4) and supporting surface (501) successively;
C, after the outer twisting face (101) of the processing successively described in step b, cut-off neck slot (4) and supporting surface (501), Screw thread process method machining internal thread (3) routinely;
D, after the machining internal thread of Screw thread process method routinely (3) described in step c, carry out 1 ~ 6 extrusion-deformation at the middle part of the inner side surface (201) alleviating groove (2) to internal thread (3) direction.
2. a kind of light antifatigue self-locking nut according to claim 1, it is characterized in that: described inner side surface (201) is for circular, interior twisting face (102) is circular or polygonal, and at the middle part of inner side surface (201), internal thread (3) direction is provided with 1 ~ 6 lateral extrusion point.
3. a kind of light antifatigue self-locking nut according to claim 1, is characterized in that: described in alleviate groove (2) cross section be rectangle.
4. a kind of light antifatigue self-locking nut according to claim 1, is characterized in that: described in alleviate groove (2) cross section be triangle or wedge shape.
5. 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), and supporting surface (501) is provided with profile of tooth, plane or step.
6. a kind of light antifatigue self-locking nut according to claim 1, is characterized in that: the number of times of mold pressing or forging and stamping in described step a 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 CN103452986A (en) | 2013-12-18 |
| CN103452986B true CN103452986B (en) | 2015-11-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121267B (en) * | 2014-08-08 | 2017-01-18 | 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 |
| 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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| 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 |
| CN201180725Y (en) * | 2008-04-21 | 2009-01-14 | 贵州航天精工制造有限公司 | High-lock nut |
| CN201425054Y (en) * | 2009-04-08 | 2010-03-17 | 东莞大朗金准电器厂 | Tensile type flanging nut |
| 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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2013
- 2013-08-08 CN CN201310344479.6A patent/CN103452986B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN201180725Y (en) * | 2008-04-21 | 2009-01-14 | 贵州航天精工制造有限公司 | High-lock nut |
| CN201425054Y (en) * | 2009-04-08 | 2010-03-17 | 东莞大朗金准电器厂 | Tensile type flanging nut |
| 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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| CN103452986A (en) | 2013-12-18 |
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