CN116586923A - Manufacturing method of lightning protection nut assembly with gasket ring sleeve - Google Patents
Manufacturing method of lightning protection nut assembly with gasket ring sleeve Download PDFInfo
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- CN116586923A CN116586923A CN202310861152.XA CN202310861152A CN116586923A CN 116586923 A CN116586923 A CN 116586923A CN 202310861152 A CN202310861152 A CN 202310861152A CN 116586923 A CN116586923 A CN 116586923A
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- protection nut
- quincuncial
- hole
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 238000007514 turning Methods 0.000 claims abstract description 56
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 230000007246 mechanism Effects 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 17
- 238000005452 bending Methods 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 14
- 230000006872 improvement Effects 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract description 3
- 238000012856 packing Methods 0.000 description 10
- 238000009434 installation Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011031 large-scale manufacturing process Methods 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Gasket Seals (AREA)
Abstract
The invention discloses a manufacturing method of a lightning protection nut component with a gasket ring, which combines the improvement of the structure of the lightning protection nut component with the improvement of the processing and manufacturing process of the lightning protection nut component, so as to realize the processing and manufacturing of the lightning protection nut component which is more convenient to install and can better avoid the damage of a gasket mounting matrix (such as the surface of an aviation composite material) with lower manufacturing cost and higher production efficiency. Comprising the following steps: heating the cylindrical blank, putting the cylindrical blank into a hot upsetting die, and forming a hot upsetting piece through hot upsetting; loading the quincuncial tooth bar part of the hot upsetting member into a turning fixture, clamping the hot upsetting member on a numerical control lathe through the turning fixture, and further turning to obtain a turning member to obtain a lightning protection nut later; placing the plate blank into a stamping die and then obtaining the gasket sleeve through stamping forming; and sleeving the gasket sleeve on the conical head of the lightning protection nut to enable the end face of the conical head to be matched with the bottom plate and the side face of the conical head to be matched with the flanging.
Description
Technical Field
The invention relates to a processing and manufacturing method of a special threaded connecting piece, in particular to a manufacturing method of a lightning protection nut assembly with a gasket ring.
Background
The invention relates to a processing and manufacturing method of a special threaded connecting piece, in particular to a manufacturing method of a lightning protection nut assembly with a gasket ring.
Aircraft airframe structures have commonly employed composite materials, wherein the composite material connections require the assembly of a large number of metal fasteners. Because composite materials are less conductive than metals, metal fasteners become the dominant lightning strike attachment point when an aircraft encounters a lightning strike. At this time, if gaps exist between the metal fastener and the wall of the composite material hole, when the lightning current of the metal fastener exceeds a certain current threshold value, air in the gaps can be ionized, so that an arc is caused. The arc may damage the composite material and in severe cases may ignite the fuel vapor to explode.
The applicant provides an aviation composite material connecting fastener in a patent document with a publication number of CN115163630A, a bushing is sleeved on a connecting rod (particularly a screw rod part) of the connecting fastener, radial expansion of the bushing can be closely attached to a wall of a composite material hole and an outer side wall of the connecting rod respectively, current dissipation of the connecting fastener is improved, and accordingly a current threshold is reduced, and lightning-proof performance of the connecting fastener is effectively improved. The connecting fastener further includes a nut and washer portion.
The above patent documents only provide specific structures of the nut and the washer for the case where the washer mounting base is a slope. In contrast, in the case of the washer with the inner spherical structure or the washer with the conventional structure used in this patent document, since the nut and the washer are separated from each other before assembling, it is necessary to first select the washer and mount the washer before mounting the nut, resulting in inconvenience in mounting the nut. The problem of inconvenient nut installation caused by the mode of installing the washer before installing the nut is more remarkable because the installation space condition of the aviation composite material connecting fastener is relatively narrow (which is also the reason that the nut in the patent document adopts the dodecagonal quincuncial tooth structure).
On the other hand, the above patent documents do not relate to a method for manufacturing the respective portions of the connecting fastener. For example, according to a conventional manufacturing process, nuts and washers in the patent document are processed by numerical control cutting (mainly numerical milling and turning), so that the loss of the cutting tool is high, thereby causing higher processing and manufacturing cost and being not beneficial to large-scale production.
Disclosure of Invention
The invention aims to provide a manufacturing method of a lightning protection nut component with a gasket ring, which combines the improvement of the structure of the lightning protection nut component with the improvement of the processing and manufacturing process of the lightning protection nut component, so as to realize the processing and manufacturing of the lightning protection nut component which is more convenient to install and can better avoid the damage of a gasket mounting matrix (such as the surface of an aviation composite material) with lower manufacturing cost and higher production efficiency.
A manufacturing method of a lightning protection nut component with a gasket ring comprises the following steps: a) The processing and manufacturing of the lightning protection nut specifically comprises the following steps: a1 Heating the cylindrical blank, putting the cylindrical blank into a hot upsetting die, and forming a hot upsetting part through hot upsetting, wherein the hot upsetting part consists of a disc-shaped head part, a quincuncial toothed rod part and a reducing shrinkage part which is connected between the disc-shaped head part and the quincuncial toothed rod part and gradually reduces in diameter from the disc-shaped head part to the quincuncial toothed rod part; a2 Loading the quincuncial toothed bar part of the hot upsetting member into a turning fixture, clamping the hot upsetting member on a numerical control lathe through the turning fixture, and turning the hot upsetting member into a turning member, wherein the turning member is provided with an inner hole axially penetrating the hot upsetting member through turning and a conical head formed on the basis of the disc-shaped head, the side surface of the conical head is a conical surface with the diameter gradually decreasing from the end surface of the conical head to the quincuncial toothed bar part, the end surface and the side surface of the conical head are transited through a conical head arc chamfer, and the inner hole is provided with a countersink positioned at one end of the conical head; a3 Performing power wire forming on a through hole part positioned at the opposite side of the countersunk hole on an inner hole of the turning piece to form a threaded hole, synchronously and radially inwards extruding at least one pair of tooth grooves on the quincuncial tooth bar part through a first closing-in mechanism to realize closing-in of the threaded hole so as to obtain a lightning protection nut, wherein each pair of tooth grooves in the at least one pair of tooth grooves consists of two opposite tooth grooves positioned in the same diameter direction; b) The gasket ring is manufactured by processing, and specifically comprises: b1 Placing a plate blank into a stamping die to obtain the gasket sleeve through stamping forming, wherein the gasket sleeve consists of a bottom plate, a central hole positioned on the bottom plate and a flange arranged at the edge of the bottom plate, the bottom plate is bent to incline by 2-6 degrees in the axial direction opposite to the axial direction of the flange in the radial outward extending direction from the center of the central hole, and a gasket bending arc angle with the inner radius larger than the radius of the conical head arc chamfer is formed between the bottom plate and the flange after the flange is formed; c) The lightning protection nut and the gasket sleeve are assembled to form a lightning protection nut component, which specifically comprises: c1 The gasket sleeve is sleeved on the conical head of the lightning protection nut, the end face of the conical head is matched with the bottom plate, the side face of the conical head is matched with the flanging, then the flanging is radially inwards extruded through the second closing-in mechanism to enable the flanging to be bent and deformed into a conical sleeve matched with the conical surface so as to prevent the gasket sleeve from being separated from the conical head, and the inner radius of the bending arc angle of the gasket is kept larger than the radius of the arc chamfer of the conical head and enables the lightning protection nut and the gasket sleeve to rotate relatively.
According to an embodiment of the present invention, the hot heading die includes: the mold core is made of hard alloy and is provided with a cavity which is matched with the hot upsetting piece in shape, and two ends of the cavity penetrate through the mold core; the die sleeve is made of die steel with hardness smaller than that of the hard alloy, is sleeved on the outer side of the die core, and is in interference fit with the die core.
According to an embodiment of the present invention, the turning jig includes: the front end of the barrel is used for clamping the hot upsetting piece, the rear end of the barrel is used for being sleeved in a jacket of a lathe rotating shaft and coaxially rotates along with the rotating shaft under the drive of the rotating shaft, and the jacket can uniformly apply radially inward clamping force on one circle of the barrel to fix the barrel; the first notch system consists of a plurality of first notches which are uniformly arranged at intervals along the circumference of the cylinder body, extend from the front end surface of the cylinder body to the position close to the rear end surface of the cylinder body and penetrate through the side wall of the cylinder body in depth; the second notch system consists of a plurality of second notches which are uniformly arranged at intervals along the circumference of the cylinder body, extend from the rear end surface of the cylinder body to the position close to the front end surface of the cylinder body and penetrate through the side wall of the cylinder body in depth; the quincuncial tooth-shaped hole is coaxially arranged with the cylinder body and penetrates from the front end face of the cylinder body to the rear end face of the cylinder body, and the quincuncial tooth-shaped hole is matched with the quincuncial tooth rod part of the hot upsetting member.
According to the embodiment of the invention, the quincuncial tooth-shaped hole is processed on the cylinder before the first notch system and the second notch system are cut on the cylinder. In addition, the plum blossom tooth-shaped hole can be formed by processing the cylinder body through a linear cutting processing technology.
According to the embodiment of the invention, the processing and manufacturing of the lightning protection nut further comprises the following steps: and turning the end face of the quincuncial tooth bar part of the turning piece so as to machine a chamfer on the end face of the quincuncial tooth bar part, wherein the chamfer comprises an outer edge chamfer of the end face of the quincuncial tooth bar part and an orifice chamfer of the inner hole on the end face of the quincuncial tooth bar part.
According to an embodiment of the present invention, the first closing-in mechanism includes: the turning piece fixing structure is used for fixing the turning piece after the power wire; the side sliding block mechanism is arranged beside a turning piece after a fixed power wire and comprises at least one pair of side sliding blocks, each pair of side sliding blocks in the at least one pair of side sliding blocks is used for synchronously and radially inwards extruding a corresponding pair of tooth grooves on the quincuncial tooth bar portion under the drive of the driving mechanism, each side sliding block in each pair of side sliding blocks in the at least one pair of side sliding blocks is provided with an extrusion head used for contacting and extruding the corresponding tooth groove, and the extrusion head is of a flat structure, and the length direction of the outer edge of the flat structure is consistent with the axial direction of the quincuncial tooth bar portion.
According to an embodiment of the present invention, the second closing-in mechanism includes: the upper die is internally provided with a cavity, and the cavity is sequentially provided with a positioning guide countersink, a conical closing hole and an upper abdication hole which are coaxially arranged from bottom to top; the upper end face of the lower die is provided with a core block matched with the positioning guide countersink, and the upper end face of the core block is provided with a cylindrical bulge and an annular groove positioned at the periphery of the cylindrical bulge; the cylindrical bulge is used for being matched with a central hole of the gasket sleeve, the shape and the size of the annular groove are matched with a bottom plate of the gasket sleeve and a gasket bending arc angle on the bottom plate, when the gasket sleeve is used, the lightning protection nut is assembled with the gasket sleeve and placed on the upper end face of the core block, so that the central hole of the gasket sleeve is matched with the cylindrical bulge, the bottom plate of the gasket sleeve and the gasket bending arc angle on the bottom plate are placed in the annular groove, when the upper die and the lower die are matched, the core block enters the positioning guide countersink and pushes the lightning protection nut and the gasket sleeve to move towards the direction of the tapered closing-in hole under the guide of the positioning guide countersink, and the flanging is radially inwards extruded through the tapered closing-in hole so that the flanging is bent and deformed into the tapered sleeve matched with the tapered surface.
According to the embodiment of the invention, the quincuncial tooth rod part adopts a dodecagonal quincuncial tooth structure. Further, the bottom plate is bent to be inclined by 4 ° in a direction extending radially outward from the center of the center hole toward an axial direction opposite to an axial direction in which the burring is located.
The manufacturing method of the lightning protection nut component with the gasket ring has at least the following beneficial technical effects:
1. the lightning protection nut is few in processing and manufacturing process steps, few in part conversion and clamping times, small in loss of cutting tools, reasonable in process flow design, and high-efficiency and large-scale production is realized by using a die (a hot heading die and a first closing mechanism) and a self-made jig (a turning fixture) more. Therefore, the processing and manufacturing cost of the lightning protection nut can be remarkably reduced, and the production efficiency can be improved.
2. Through mutually supporting the conical surface of lightning protection nut and the conical sleeve of packing ring cover, ingenious realization lightning protection nut and packing ring cover disjunctor formula design, like this, avoid the step of selecting the packing ring before the installation lightning protection nut and installing the packing ring earlier, realized the synchronous installation of lightning protection nut and packing ring cover, promoted the installation convenience of lightning protection nut greatly.
3. Because the bottom plate of the gasket sleeve is bent to incline 2-6 degrees in the axial direction opposite to the axial direction of the flanging in the direction extending outwards from the center of the central hole in the radial direction, the gasket sleeve can be ensured not to contact with the gasket mounting base body (such as the surface of the aviation composite material) by sharp edges, and the gasket sleeve is prevented from scratching the gasket mounting base body.
4. The bottom plate of the gasket sleeve is bent to incline 2-6 degrees in the direction of extending outwards from the center of the center hole in the axial direction opposite to the axial direction in which the flange is located, and meanwhile, the inner radius of the bent circular arc angle of the gasket is larger than the radius of the circular arc chamfer of the conical head, so that the lightning protection nut and the gasket sleeve can rotate relatively, and the lightning protection nut and the gasket sleeve can rotate relatively easily, and the phenomenon that the center of a screw rod connected with the lightning protection nut is deviated due to abrasion between the lightning protection nut and the gasket sleeve to influence the current dissipation effect is avoided.
Therefore, the manufacturing method of the lightning protection nut component with the gasket ring sleeve combines the improvement of the structure of the lightning protection nut component with the improvement of the processing and manufacturing process of the lightning protection nut component, so that the lightning protection nut component which is more convenient to install and better avoids the damage of a gasket installation matrix (such as the surface of an aviation composite material) is manufactured with lower manufacturing cost and higher production efficiency.
The invention is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural view (seen from the axial direction) of a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 2 is a schematic structural view (from radial direction) of a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a hot heading die in a manufacturing method of a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 4 is a schematic structural view of a hot upsetting member in a manufacturing method of a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 5 is a schematic structural view of a turning fixture in a method for manufacturing a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 6 is a schematic structural view of a turning fixture in a method for manufacturing a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 7 is a schematic structural view of a turning piece in a method for manufacturing a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 8 is a schematic structural view of a first closing-up mechanism in a method for manufacturing a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Fig. 9 is a schematic structural view of a gasket sleeve (before flanging and bending deformation) in a lightning protection nut assembly with the gasket sleeve according to an embodiment of the invention.
Fig. 10 is a schematic structural view of a second closing mechanism in a method for manufacturing a lightning protection nut assembly with a gasket ring according to an embodiment of the invention.
Marked in the figure as: the lightning protection nut 1, the conical head 11, the quincuncial tooth bar portion 12, the reducing shrinkage portion 13, the inner hole 14, the countersunk hole 141, the threaded hole 142, the central hole 22, the gasket sleeve 2, the bottom plate 21, the flanging 23, the gasket bending arc angle 24, the hot upsetting piece 1A, the disc-shaped head 11A, the quincuncial tooth bar portion 12A, the reducing shrinkage portion 13A, the turning piece 1B, the inner hole 14B, the countersunk hole 141B, the upsetting die 3, the die core 31, the die cavity 311, the die sleeve 32, the turning clamp 4, the cylinder 41, the first notch system 42, the second notch system 43, the first necking mechanism 5, the side sliding block 51, the extrusion head 52, the second necking mechanism 6, the upper die 61, the positioning guiding countersunk hole 611, the conical necking hole 612, the upper abdicating hole 613, the lower die 62, the core block 621, the cylindrical boss 622, and the annular groove 623.
What needs to be specifically stated is: the same terminology, referred to in this specification with different reference numerals, refers to the same structure in different processing states. Specifically: the quincuncial tooth bar 12 refers to the quincuncial tooth bar on the finished product of the lightning protection nut 1, and the quincuncial tooth bar 12A refers to the quincuncial tooth bar on the hot upsetting member 1A, which is the precursor of the lightning protection nut 1; the reducing shrinkage part 13 is a reducing shrinkage part on the finished product of the lightning protection nut 1, and the reducing shrinkage part 13A is a reducing shrinkage part on the hot upsetting member 1A which is the precursor of the lightning protection nut 1; the inner hole 14 is the inner hole on the finished product of the lightning protection nut 1, and the inner hole 14B is the inner hole on the turning piece 1B which is the precursor of the lightning protection nut 1; the counter bore 141 is a counter bore in the finished product of the lightning protection nut 1, and the counter bore 141B is a counter bore in the turning piece 1B, which is the precursor of the lightning protection nut 1.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be noted in particular that:
the technical solutions and technical features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, the described embodiments, features, and combinations of features can be combined as desired and claimed in any given application.
The embodiments of the invention that are referred to in the following description are typically only a few, but not all, embodiments, based on which all other embodiments, as would be apparent to one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the patent protection.
With respect to terms and units in this specification: the terms "comprising," "including," "having," and any variations thereof, in this specification and the corresponding claims and related parts, are intended to cover a non-exclusive inclusion. Furthermore, other related terms and units may be reasonably construed based on the description provided herein.
Fig. 1 is a schematic structural view (seen from the axial direction) of a lightning protection nut assembly with a gasket ring according to an embodiment of the invention. Fig. 2 is a schematic structural view (from radial direction) of a lightning protection nut assembly with a gasket ring according to an embodiment of the invention. Fig. 9 is a schematic structural view of a gasket sleeve (before flanging and bending deformation) in a lightning protection nut assembly with the gasket sleeve according to an embodiment of the invention. As shown in fig. 1-2 and 9, the lightning protection nut assembly with the gasket sleeve comprises a lightning protection nut 1 and a gasket sleeve 2.
The lightning protection nut 1 comprises a conical head 11, a quincuncial toothed bar portion 12, a reducing shrinkage portion 13 connected between the conical head 11 and the quincuncial toothed bar portion 12 and with the diameter gradually reduced from the conical head 11 to the quincuncial toothed bar portion 12, and an inner hole 14 axially penetrating the lightning protection nut 1, wherein the inner hole 14 is provided with a countersink 141 (the countersink 141 has the main function of providing a yielding space for sleeving a bushing on a screw rod matched with the lightning protection nut 1) at one end of the conical head 11 and a threaded hole 142 positioned at the opposite side of the countersink 141, the quincuncial toothed bar portion 12 is of a dodecagonal quincuncial toothed structure, and the outer edge of the conical head 11 is provided with a conical head circular arc chamfer.
The gasket sleeve 2 is composed of a bottom plate 21, a central hole 22 positioned on the bottom plate 21 and a flange 23 arranged at the edge of the bottom plate 21, wherein the bottom plate 21 is bent to incline 2-6 degrees in the axial direction opposite to the axial direction of the flange 23 in the direction extending outwards from the center of the central hole 22, a gasket bending circular arc angle 24 is formed between the bottom plate 21 and the flange 23 after the flange 23 is molded, and the inner radius of the gasket bending circular arc angle 24 is larger than the radius of the conical head circular arc chamfer.
After the lightning protection nut 1 and the gasket sleeve 2 are assembled to form the lightning protection nut assembly, the gasket sleeve 2 is sleeved on the conical head 11 of the lightning protection nut 1, so that the end face of the conical head 11 is matched with the bottom plate 21, the side face of the conical head 11 is matched with the flanging 23, the flanging 23 is bent and deformed to be matched with the conical surface, so that the gasket sleeve 2 is prevented from being separated from the conical head 11, and the inner radius of the curved circular arc angle 24 of the gasket is still larger than the radius of the circular arc chamfer of the conical head, so that the lightning protection nut 1 and the gasket sleeve 2 can rotate relatively.
The lightning protection nut component with the gasket ring has the following characteristics: through mutually supporting the conical surface of lightning protection nut 1 and the conical sleeve of packing ring cover 2, ingenious realization lightning protection nut 1 and packing ring cover 2 disjunctor formula design, like this, avoid the step of selecting the packing ring before installing lightning protection nut 1 and installing the packing ring earlier, realized the synchronous installation of lightning protection nut 1 and packing ring cover 2, promote lightning protection nut's installation convenience greatly.
In addition, since the bottom plate 21 of the gasket sleeve 2 is bent to incline 2 ° to 6 ° in the direction extending radially outward from the center of the center hole 22 toward the axial direction opposite to the axial direction in which the burring 23 is located, it is ensured that the gasket sleeve 2 does not have sharp edges in contact with the gasket mounting base (e.g., the surface of the aerospace composite material), preventing the gasket sleeve 2 from scratching the gasket mounting base.
In addition, since the bottom plate 21 of the gasket sleeve 2 is bent to incline 2 ° to 6 ° in the direction extending radially outward from the center of the center hole 22 toward the axial direction opposite to the axial direction in which the flange 23 is located, and at the same time, the inner radius of the curved circular arc angle 24 of the gasket is larger than the radius of the circular arc chamfer of the conical head, so that the lightning protection nut 1 and the gasket sleeve 2 can relatively rotate, the lightning protection nut 1 and the gasket sleeve 2 can relatively rotate easily, and the phenomenon that the center of the screw rod connected with the lightning protection nut 1 is deviated due to abrasion between the lightning protection nut 1 and the gasket sleeve 2, thereby affecting the current dissipation effect is avoided.
In a preferred embodiment, the bottom plate 21 is bent to an inclination of 4 ° in a direction extending radially outwards from the center of the central hole 22 in an axial direction opposite to the axial direction in which the flange 23 is located.
When the bottom plate 21 is bent in a direction extending radially outward from the center of the center hole 22 to an inclination angle smaller than 2 ° in an axial direction opposite to the axial direction in which the flange 23 is located, the gasket sleeve 2 still has a large contact area with the gasket mounting base (e.g., the surface of an aeronautical composite material) and the conical head 11 of the lightning protection nut 1, respectively, and the effect of protecting the gasket mounting base and the end face of the conical head 11 is not obvious.
When the bottom plate 21 is bent to an inclination angle of more than 6 ° in a direction extending radially outward from the center of the center hole 22 toward an axial direction opposite to the axial direction in which the flange 23 is located, a large elastic deformation of the gasket sleeve 2 is caused when the lightning protection nut 1 is mounted, affecting the rotation of the lightning protection nut 1.
It has been found desirable to bend the bottom plate 21 to an inclination of 4 deg. in a direction extending radially outwards from the centre of the central hole 22 in an axial direction opposite to the axial direction in which the bead 23 is located.
As shown in fig. 1 to 10, the manufacturing method of the lightning protection nut assembly with the gasket ring comprises the following steps:
a) The processing and manufacturing of the lightning protection nut 1 specifically comprises:
a1 A cylindrical blank is heated and placed in a hot heading die 3 to be formed into a hot heading piece 1A by hot heading, wherein the hot heading piece 1A is composed of a disc-shaped head 11A, a quincuncial toothed bar portion 12A and a reducing shrinkage portion 13A which is connected between the disc-shaped head 11A and the quincuncial toothed bar portion 12A and gradually reduces in diameter from the disc-shaped head 11A to the quincuncial toothed bar portion 12A.
A2 Loading the quincuncial toothed bar portion 12A of the hot-heading member 1A into a turning fixture 4, clamping the hot-heading member 1A on a numerical control lathe through the turning fixture 4, and turning the hot-heading member 1A into a turning member 1B, wherein the turning member 1B is provided with an inner hole 14B axially penetrating the hot-heading member 1A through the turning, and a conical head 11 formed on the basis of the disc-shaped head 11A, the side surface of the conical head 1 is a conical surface with the diameter gradually decreasing from the end surface of the conical head to the quincuncial toothed bar portion, the end surface and the side surface of the conical head 11 are in transition through a conical head circular arc chamfer, the inner hole 14B is provided with a countersink 141B positioned at one end of the conical head, and thereafter, the end surface of the quincuncial toothed bar portion 12A of the turning member 1B is subjected to turning so as to form a chamfer on the end surface of the quincuncial toothed bar portion 12A, and the chamfer of the outer edge of the quincuncial toothed bar portion 12A and the chamfer of the inner hole 14B is included in the chamfer of the end surface of the quincuncial toothed bar portion.
A3 The through hole part on the opposite side of the countersunk hole 141B on the inner hole 14B of the turning piece 1B is subjected to power wire forming to form a threaded hole, then the turning piece 1B after power wire is synchronously and radially inwards extruded by the first closing mechanism 5 to realize closing of the threaded hole so as to obtain a lightning protection nut (at this time, the inner hole 14B is completely formed into the inner hole 14 of the lightning protection nut 1, the quincuncial tooth bar 12A is completely formed into the quincuncial tooth bar 12 of the lightning protection nut 1), and each pair of tooth grooves in the at least one pair of tooth grooves consists of two opposite tooth grooves on the same diameter direction.
B) The gasket sleeve 2 is manufactured by processing, and specifically comprises:
b1 The blank is placed in a stamping die and the washer sleeve 2 is obtained by stamping. As is apparent from the above, the gasket 2 is composed of the bottom plate 21, the center hole 22 located on the bottom plate 21, and the flange 23 provided at the edge of the bottom plate 21, the bottom plate 21 is bent to be inclined by 2 ° to 6 ° in the axial direction opposite to the axial direction in which the flange 23 is located in the direction extending radially outward from the center of the center hole 22, and a gasket bending circular arc angle 24 is formed between the bottom plate 21 and the flange 23 after the flange 23 is formed, and the inner radius of the gasket bending circular arc angle 24 is larger than the radius of the cone-head circular arc chamfer.
C) The lightning protection nut 1 and the gasket sleeve 2 are assembled to form a lightning protection nut component, which specifically comprises:
c1 The gasket sleeve 2 is sleeved on the conical head 11 of the lightning protection nut 1, so that the end face of the conical head 11 is matched with the bottom plate 21, the side face of the conical head 11 is matched with the flanging 23, then the flanging 23 is radially inwards extruded through the second closing-in mechanism 6 to enable the flanging 23 to be bent and deformed into a conical sleeve matched with the conical surface so as to prevent the gasket sleeve 2 from being separated from the conical head 11, and the inner radius of the bent circular arc angle of the gasket is kept larger than the radius of the circular arc chamfer of the conical head and enables the lightning protection nut and the gasket sleeve to rotate relatively.
The manufacturing method has the following advantages: 1. the lightning protection nut 1 has the advantages of few processing steps, few part conversion and clamping times, small loss of cutting tools, reasonable process flow design, and high-efficiency and large-scale production realized by more dies (the hot heading die 3 and the first closing mechanism 5) and self-made jigs (the turning jigs 4). 2. The second closing-in mechanism 6 is used when the lightning protection nut 1 and the gasket sleeve 2 are assembled to form the lightning protection nut assembly, so that high-efficiency and large-scale production can be realized. Therefore, the manufacturing method can remarkably reduce the processing and manufacturing cost of the lightning protection nut and improve the production efficiency.
In an alternative embodiment, as shown in fig. 3, the hot heading die 3 includes: a mold core 31, wherein the mold core 31 is made of hard alloy and is provided with a cavity 311 which is in shape of the hot upsetting member 1A, and two ends of the cavity 311 penetrate through the mold core 31; the die sleeve 32, the die sleeve 32 is made of die steel with hardness smaller than that of the hard alloy and sleeved on the outer side of the die core 31, and the die sleeve 32 is in interference fit with the die core 31.
In order to ensure the precision and quality of hot heading, the mold core 31 is made of hard alloy, such as tungsten steel alloy, so that the mold core 31 is not easy to deform. However, cemented carbide is generally brittle and easily broken, and therefore, a die sleeve 32 having a hardness smaller than that of the cemented carbide is further provided outside the die core 31, and thus, the die core 31 can be effectively prevented from being broken by absorbing hot heading force through the die sleeve 32.
As shown in fig. 5-6, in an alternative embodiment, the turning clamp 4 comprises: the cylinder 41 is made of steel, the front end of the cylinder 41 is used for clamping the hot upsetting piece, the rear end of the cylinder 41 is used for being sleeved in a jacket of a lathe rotating shaft and coaxially rotates along with the rotating shaft under the driving of the rotating shaft, and the jacket can uniformly apply radially inward clamping force on one circle of the cylinder to fix the cylinder 41; a first slit system 42, wherein the first slit system 42 is composed of a plurality of first slits which are uniformly arranged at intervals along the circumference of the cylinder 41, extend from the front end surface of the cylinder 41 to the rear end surface of the cylinder 41, and penetrate through the side wall of the cylinder 41 in depth; a second slit system 43 composed of a plurality of second slits arranged at regular intervals along the circumference of the cylinder 41 and having a length extending from the rear end surface of the cylinder 41 to a depth penetrating the side wall of the cylinder 41 near the front end surface of the cylinder 41; the quincuncial tooth-shaped hole 43 is coaxially arranged with the cylinder 41 and penetrates from the front end surface of the cylinder to the rear end surface of the cylinder 41, and the quincuncial tooth-shaped hole 43 is matched with the quincuncial tooth bar portion 12A of the hot upsetting member 1A.
Preferably, the quincuncial toothed hole 43 is formed in the cylinder 41 before the first slit system 42 and the second slit system 43 are cut in the cylinder 41. More specifically, the quincuncial tooth holes 43 are formed in the cylinder 41 by a wire-cut machining process. Thereby, the machining accuracy of the quincuncial tooth holes 43 can be ensured.
The turning jig 4 is essentially an elastically expandable structure in which the quincuncial toothed hole 43 for mating with the quincuncial toothed bar portion 12A of the hot header 1A is formed, so that when the clamping sleeve of the lathe spindle uniformly applies a radially inward clamping force on the circumference of the turning jig 4, the elastically expandable structure is synchronously contracted inward, thereby clamping the quincuncial toothed bar portion 12A and ensuring high coaxiality.
In an alternative embodiment, as shown in fig. 8, the first closing-in mechanism 5 includes: the turning piece fixing structure is used for fixing the turning piece after the power wire; the side sliding block mechanism is arranged beside a turning piece after the fixed power wire and comprises at least one pair of side sliding blocks 51, each side sliding block 51 in the at least one pair of side sliding blocks 51 is used for synchronously and radially inwards extruding a corresponding pair of tooth grooves on the quincuncial tooth bar portion 12A under the drive of the driving mechanism, each side sliding block in the at least one pair of side sliding blocks is provided with an extrusion head 52 used for contacting and extruding the corresponding tooth groove, and the extrusion head 52 is of a flat structure, and the length direction of the outer edge of the flat structure is consistent with the axial direction of the quincuncial tooth bar portion 12A.
The drive mechanism may drive the side slider 51 in any possible manner, such as a hydraulic cylinder or other mechanical structure.
The main feature of the first closing-in mechanism 5 is that the extrusion head 52 has a flat structure, and the length direction of the outer edge of the flat structure is consistent with the axial direction of the quincuncial toothed bar 12A, so that the quincuncial toothed bar 12A can be closed uniformly in the axial direction.
As shown in fig. 10, the second closing-in mechanism 6 includes: the upper die 61 is provided with a die cavity, and the die cavity is provided with a positioning guide countersink 611, a conical closing hole 612 and an upper abdication hole 613 which are coaxially arranged from bottom to top in sequence; a lower die 62, wherein a core block 621 for matching with the positioning guide counter bore 611 is arranged on the upper end surface of the lower die 62, and a cylindrical protrusion 622 and an annular groove 623 positioned on the periphery of the cylindrical protrusion 622 are arranged on the upper end surface of the core block 621; wherein the cylindrical protrusion 622 is configured to cooperate with the central hole 22 of the gasket sleeve 2, the annular groove 623 is shaped and sized to match the bottom plate 21 of the gasket sleeve 2 and the curved circular arc angle of the gasket on the bottom plate 21 (that is, the annular groove 623 has the same inclination as the inclination on the bottom plate 21), the lightning protection nut 1 is assembled with the gasket sleeve 2 and placed on the upper end surface of the core block 621 in use, such that the central hole 22 of the gasket sleeve 2 cooperates with the cylindrical protrusion 622 and the curved circular arc angle of the gasket on the bottom plate 21 of the gasket sleeve 2 and the core block 621 enters the positioning guide countersink 611 when the upper die 61 and the lower die 62 are clamped and pushes the lightning protection nut 1 and the gasket sleeve 2 to move in the direction of the tapered necking hole 612 under the guiding of the positioning guide countersink 611, and the flanging 23 is pressed radially inwards by the tapered necking hole 612 to deform the flanging 23 into the tapered sleeve that cooperates with the tapered conical surface.
The main feature of the second closing-in mechanism 6 is that the annular groove 623 has the same inclination angle as that of the bottom plate 21, so that when the upper die 61 and the lower die 62 are clamped, the inclination angle of the bottom plate 21 is not deformed due to the clamping pressure, thereby ensuring that after the lightning protection nut 1 and the gasket sleeve 2 are assembled to form the lightning protection nut assembly, the bottom plate 21 is still bent to be inclined by 2 ° to 6 ° in the direction extending radially outward from the center of the center hole 22 in the axial direction opposite to the axial direction in which the flange 23 is located.
The content of the present invention is described above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the foregoing specification, all other embodiments that may be obtained by one of ordinary skill in the art without making any inventive effort are intended to be within the scope of patent protection.
Claims (10)
1. A manufacturing method of a lightning protection nut component with a gasket ring is characterized by comprising the following steps: comprising the following steps:
a) The processing and manufacturing of the lightning protection nut specifically comprises the following steps:
a1 Heating the cylindrical blank, putting the cylindrical blank into a hot upsetting die, and forming a hot upsetting part through hot upsetting, wherein the hot upsetting part consists of a disc-shaped head part, a quincuncial toothed rod part and a reducing shrinkage part which is connected between the disc-shaped head part and the quincuncial toothed rod part and gradually reduces in diameter from the disc-shaped head part to the quincuncial toothed rod part;
a2 Loading the quincuncial toothed bar part of the hot upsetting member into a turning fixture, clamping the hot upsetting member on a numerical control lathe through the turning fixture, and turning the hot upsetting member into a turning member, wherein the turning member is provided with an inner hole axially penetrating the hot upsetting member through turning and a conical head formed on the basis of the disc-shaped head, the side surface of the conical head is a conical surface with the diameter gradually decreasing from the end surface of the conical head to the quincuncial toothed bar part, the end surface and the side surface of the conical head are transited through a conical head arc chamfer, and the inner hole is provided with a countersink positioned at one end of the conical head;
a3 Performing power wire forming on a through hole part positioned at the opposite side of the countersunk hole on an inner hole of the turning piece to form a threaded hole, synchronously and radially inwards extruding at least one pair of tooth grooves on the quincuncial tooth bar part through a first closing-in mechanism to realize closing-in of the threaded hole so as to obtain a lightning protection nut, wherein each pair of tooth grooves in the at least one pair of tooth grooves consists of two opposite tooth grooves positioned in the same diameter direction;
b) The gasket ring is manufactured by processing, and specifically comprises:
b1 Placing a plate blank into a stamping die to obtain the gasket sleeve through stamping forming, wherein the gasket sleeve consists of a bottom plate, a central hole positioned on the bottom plate and a flange arranged at the edge of the bottom plate, the bottom plate is bent to incline by 2-6 degrees in the axial direction opposite to the axial direction of the flange in the radial outward extending direction from the center of the central hole, and a gasket bending arc angle with the inner radius larger than the radius of the conical head arc chamfer is formed between the bottom plate and the flange after the flange is formed;
c) The lightning protection nut and the gasket sleeve are assembled to form a lightning protection nut component, which specifically comprises:
c1 The gasket sleeve is sleeved on the conical head of the lightning protection nut, the end face of the conical head is matched with the bottom plate, the side face of the conical head is matched with the flanging, then the flanging is radially inwards extruded through the second closing-in mechanism to enable the flanging to be bent and deformed into a conical sleeve matched with the conical surface so as to prevent the gasket sleeve from being separated from the conical head, and the inner radius of the bending arc angle of the gasket is kept larger than the radius of the arc chamfer of the conical head and enables the lightning protection nut and the gasket sleeve to rotate relatively.
2. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the hot heading die includes: the mold core is made of hard alloy and is provided with a cavity which is matched with the hot upsetting piece in shape, and two ends of the cavity penetrate through the mold core; the die sleeve is made of die steel with hardness smaller than that of the hard alloy, is sleeved on the outer side of the die core, and is in interference fit with the die core.
3. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the turning jig includes: the front end of the barrel is used for clamping the hot upsetting piece, the rear end of the barrel is used for being sleeved in a jacket of a lathe rotating shaft and coaxially rotates along with the rotating shaft under the drive of the rotating shaft, and the jacket can uniformly apply radially inward clamping force on one circle of the barrel to fix the barrel; the first notch system consists of a plurality of first notches which are uniformly arranged at intervals along the circumference of the cylinder body, extend from the front end surface of the cylinder body to the position close to the rear end surface of the cylinder body and penetrate through the side wall of the cylinder body in depth; the second notch system consists of a plurality of second notches which are uniformly arranged at intervals along the circumference of the cylinder body, extend from the rear end surface of the cylinder body to the position close to the front end surface of the cylinder body and penetrate through the side wall of the cylinder body in depth; the quincuncial tooth-shaped hole is coaxially arranged with the cylinder body and penetrates from the front end face of the cylinder body to the rear end face of the cylinder body, and the quincuncial tooth-shaped hole is matched with the quincuncial tooth rod part of the hot upsetting member.
4. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the quincuncial tooth-shaped hole is processed on the cylinder before the first notch system and the second notch system are cut on the cylinder.
5. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 4, wherein: the plum blossom tooth-shaped hole is formed by processing the cylinder body through a linear cutting processing technology.
6. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the processing and manufacturing of the lightning protection nut further comprises the following steps: and turning the end face of the quincuncial tooth bar part of the turning piece so as to machine a chamfer on the end face of the quincuncial tooth bar part, wherein the chamfer comprises an outer edge chamfer of the end face of the quincuncial tooth bar part and an orifice chamfer of the inner hole on the end face of the quincuncial tooth bar part.
7. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the first closing-in mechanism includes: the turning piece fixing structure is used for fixing the turning piece after the power wire; the side sliding block mechanism is arranged beside a turning piece after a fixed power wire and comprises at least one pair of side sliding blocks, each pair of side sliding blocks in the at least one pair of side sliding blocks is used for synchronously and radially inwards extruding a corresponding pair of tooth grooves on the quincuncial tooth bar portion under the drive of the driving mechanism, each side sliding block in each pair of side sliding blocks in the at least one pair of side sliding blocks is provided with an extrusion head used for contacting and extruding the corresponding tooth groove, and the extrusion head is of a flat structure, and the length direction of the outer edge of the flat structure is consistent with the axial direction of the quincuncial tooth bar portion.
8. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the second closing-in mechanism includes: the upper die is internally provided with a cavity, and the cavity is sequentially provided with a positioning guide countersink, a conical closing hole and an upper abdication hole which are coaxially arranged from bottom to top; the upper end face of the lower die is provided with a core block matched with the positioning guide countersink, and the upper end face of the core block is provided with a cylindrical bulge and an annular groove positioned at the periphery of the cylindrical bulge; the cylindrical bulge is used for being matched with a central hole of the gasket sleeve, the shape and the size of the annular groove are matched with a bottom plate of the gasket sleeve and a gasket bending arc angle on the bottom plate, when the gasket sleeve is used, the lightning protection nut is assembled with the gasket sleeve and placed on the upper end face of the core block, so that the central hole of the gasket sleeve is matched with the cylindrical bulge, the bottom plate of the gasket sleeve and the gasket bending arc angle on the bottom plate are placed in the annular groove, when the upper die and the lower die are matched, the core block enters the positioning guide countersink and pushes the lightning protection nut and the gasket sleeve to move towards the direction of the tapered closing-in hole under the guide of the positioning guide countersink, and the flanging is radially inwards extruded through the tapered closing-in hole so that the flanging is bent and deformed into the tapered sleeve matched with the tapered surface.
9. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the quincuncial tooth rod part adopts a dodecagonal quincuncial tooth structure.
10. The method for manufacturing the lightning protection nut assembly with the gasket ring as defined in claim 1, wherein: the bottom plate is bent to be inclined by 4 ° in a direction extending radially outward from the center of the center hole in an axial direction opposite to an axial direction in which the burring is located.
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| CN202310861152.XA CN116586923B (en) | 2023-07-14 | 2023-07-14 | Manufacturing method of lightning protection nut assembly with gasket ring sleeve |
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| CN202310861152.XA CN116586923B (en) | 2023-07-14 | 2023-07-14 | Manufacturing method of lightning protection nut assembly with gasket ring sleeve |
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Cited By (1)
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| CN117066430A (en) * | 2023-09-20 | 2023-11-17 | 江苏中鲨精工科技有限公司 | Hot heading die for bolt machining |
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| CN116586923B (en) | 2023-10-24 |
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