CN112648277A - Permanent self-locking threaded component, and mold and method for preparing threaded component - Google Patents
Permanent self-locking threaded component, and mold and method for preparing threaded component Download PDFInfo
- Publication number
- CN112648277A CN112648277A CN202011505464.XA CN202011505464A CN112648277A CN 112648277 A CN112648277 A CN 112648277A CN 202011505464 A CN202011505464 A CN 202011505464A CN 112648277 A CN112648277 A CN 112648277A
- Authority
- CN
- China
- Prior art keywords
- thread
- fastener
- threaded
- roller
- common
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title description 10
- 230000033001 locomotion Effects 0.000 claims abstract description 35
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 241000510097 Megalonaias nervosa Species 0.000 claims description 35
- 238000005096 rolling process Methods 0.000 claims description 31
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 230000007246 mechanism Effects 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 description 12
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- 239000004830 Super Glue Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000003197 gene knockdown Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
Abstract
The invention provides a permanent self-locking assembly, a preparation mold and a preparation method. The permanent self-locking assembly comprises a first fastener and a second fastener, the first fastener comprises a body with a straight rod part, the straight rod part is provided with external threads, and the outer surfaces of two sides of the threads of the external threads are respectively a thread surface of a thread surface and a common thread surface; the thread surface of the thread surface tooth is positioned on the stressed side of the thread, and the common thread surface is positioned on the unstressed side of the thread; the thread surface of the thread surface teeth is provided with uniform thread surface teeth distributed along the normal plane of the external thread, the number of the thread surface teeth on each circle of external thread is equal, and the tooth profile parameters are the same. The second fastener is combined with the first fastener for use, and a brand-new thread surface, tooth and thread pair relationship and a brand-new anti-loosening principle are established. After the rated pre-tightening torque is reached, when relative movement or relative movement trend is generated between the first fastening piece and the second fastening piece, the second fastening piece cannot be loosened due to the restriction of the thread face teeth, and permanent self-locking connection is realized.
Description
Technical Field
The invention relates to the field of threaded connection, in particular to a permanent self-locking threaded component, a die for preparing the threaded component and a method.
Background
With the specialization and the serialization of the modern large-scale industrial development becoming more and more remarkable, the industrial design can achieve the highest cost performance only by partially or completely adopting a CKD (complete Knock Down) mode.
If different commodities of different enterprises are connected into a large-assembly system, the core element of the system is the basic connecting piece, namely a bolt-nut connecting piece.
Non-standard bolt-nut couplings in the current national standards, or already used in some fields, although having a good self-locking performance under static load conditions, are not possible under static load conditions due to the rather complicated practical application and environment, and may have interference from one or more factors, such as: the effects of mechanical vibrations (including shock loads), changes in the temperature field of the working environment, the occurrence or acceleration of stress creep in the coupling in the environment of a lubricating medium, in outdoor use for a long time, and the like.
Either singly or in combination, these factors can cause loosening and failure of the coupling, resulting in reduced reliability and even breakdown of the overall large system.
The existing thread anti-loosening method is roughly divided into modes of friction anti-loosening, mechanical forced anti-loosening, powerful glue anti-loosening, kinematic pair relationship damage and the like according to the working principle. Different specific anti-loosening methods and structures are derived from the anti-loosening principles, but each anti-loosening method or structure is long and has disadvantages.
The friction anti-loosening device has the advantages of simple structure, but is unreliable in anti-loosening when the mechanical vibration, impact load and temperature field change and the friction anti-loosening device is applied to a lubricating medium environment; the locknut with the metal embedded sheet at the tail part can lose efficacy due to stress creep when being used outdoors or for a long time; the mechanical forced anti-loosening has the advantages of good anti-loosening effect, but has the defects of troublesome manufacture and installation, high indirect cost and difficulty in adjusting the connection length; the anti-loosening of the super glue is not suitable for occasions with higher temperature, and the auxiliary process is complicated, so that the cost is increased; the method for preventing looseness by destroying the kinematic pair relationship has the advantages of reliable looseness prevention, but has the defects of incapability of being repeatedly used and complex operation.
Disclosure of Invention
In order to solve the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a permanent self-check threaded assembly including a first threaded fastener and a second threaded fastener, which is capable of achieving permanent check, and based on this, the present invention also provides two kinds of dies and manufacturing methods for manufacturing the first threaded fastener, and a die and manufacturing method for manufacturing the second threaded fastener, thereby enabling manufacturing of the above-mentioned check assembly.
Specifically, the invention provides a permanent self-locking threaded assembly, which comprises a first fastener with external threads and a second fastener with internal threads, wherein the first fastener and the second fastener are connected in a threaded mode;
the first fastener comprises a body with a straight rod part, the straight rod part is provided with an external thread, and the outer surfaces of two sides of the thread of the external thread are respectively a first threaded surface and a first common threaded surface; the first thread surface is positioned on the stressed side of the thread, and the first common thread surface is positioned on the unstressed side of the thread;
the second fastener comprises a body with a threaded hole, and the outer surfaces of two sides of an internal thread of the threaded hole are respectively a second thread surface tooth thread surface and a second common thread surface; the second thread surface is positioned on the stressed side of the internal thread, and the second common thread surface is positioned on the unstressed side of the internal thread;
the thread surface of the first thread surface tooth and the thread surface of the second thread surface tooth are both provided with thread surface teeth which are uniformly distributed along a thread normal plane, the number of the thread surface teeth on each circle of thread is equal, the tooth profile parameters are the same, and the straight rod part of the first fastener can be screwed into the thread hole of the second fastener and pre-tightened.
Preferably, the first fastener is a bolt or a screw, and the external thread of the first fastener is a triangular thread, a trapezoidal thread or a T-shaped thread.
Preferably, the internal threads of the second fastener are triangular threads, trapezoidal threads or T-shaped threads.
Preferably, the invention also provides three dies for preparing the threaded component, which comprise two first fastener preparation dies and one second fastener preparation die.
Preferably, the first fastener preparation die is a thread rolling plate matched with the thread rolling machine, the thread rolling plate comprises a fixed thread rolling plate and a movable thread rolling plate, the fixed thread rolling plate is fixedly arranged on a machine body of the thread rolling machine, the movable thread rolling plate is arranged on a guide rail capable of sliding, and the movable thread rolling plate can move back and forth relative to the fixed thread rolling plate;
the fixed washboard and the movable washboard are respectively provided with an inclined strip-shaped washboard structure for washboard, the washboard structures of the fixed washboard and the movable washboard respectively comprise a toothed inclined surface and a common inclined surface, the toothed inclined surface is used for forming a first thread surface and a tooth thread surface of a first fastener, and the common inclined surface is used for forming a first common thread surface of the first fastener.
Preferably, the second fastener preparation die comprises a grained surface tooth cutter, a guide mechanism, a workbench and a pressure device, the grained surface tooth cutter is of a cylindrical structure, external threads are machined on the outer peripheral surface of the grained surface tooth cutter, grained surface teeth are machined on the outer surface of one side of the external threads, the guide mechanism is fixedly arranged on the workbench, and a threaded hole is formed in the guide mechanism;
the thread face tooth cutter can be screwed into a threaded hole of the guide mechanism, a fastener blank with a prefabricated internal thread is arranged in a centering position with the thread face tooth cutter, then the thread face tooth cutter is screwed in, a certain gap is formed between the fastener blank and the guide mechanism, then pressure F is applied to the blank by using a pressure device, the fastener blank is subjected to moulding deformation under the constraint of the boundary of the thread face tooth cutter, after the pressure device is unloaded, corresponding thread face teeth can be formed on the fastener blank, the fastener blank is taken away after the thread face tooth cutter is withdrawn, and at the moment, the fastener blank forms a second fastener.
Preferably, the first fastener preparation mold comprises a first roller, a second roller and a stop block, a threaded part of a first fastener to be prepared is clamped between the first roller and the second roller, the stop block is arranged below the first fastener to be prepared, a toothed inclined surface and a common inclined surface are arranged on the roller surfaces of the first roller and the second roller, the toothed inclined surface is used for forming a first thread surface of the threaded part of the first fastener, and the common inclined surface is used for forming a first common thread surface of the first fastener;
the first roller and the second roller can rotate at a constant speed along respective center points of circle centers, the center point of the second roller can do linear reciprocating motion along a connecting line of the center points of the two rollers at a speed v, a first fastener to be prepared is placed between the first roller and the second roller, the first roller and the second roller rotate at a constant speed, and the center point of the second roller does linear reciprocating motion along a connecting line of the center points of the two rollers at a speed v to form a first threaded surface and a first common threaded surface required by the first fastener.
Preferably, the invention also provides a preparation method of the permanent self-locking threaded component, which comprises the following steps:
s1, preparing a first fastener: the first fastener to be prepared is extruded and formed into a first fastener with a first threaded surface and a first common threaded surface by means of cold rubbing, warm rubbing or hot rubbing by means of a fixed rubbing plate and a movable rubbing plate or by means of a cold roller, a warm roller or a hot roller;
s2, preparing a second fastener: preparing a second fastener with a second threaded surface of the threaded surface and a second common threaded surface by using the threaded surface cutter;
and S3, screwing the straight rod part of the first fastener into the threaded hole of the second fastener and pre-tightening.
Compared with the prior art, the invention has the following beneficial effects:
(1) the first fastener and the second fastener are combined for use, so that a brand-new thread surface, tooth and thread pair relationship is established, and a locking principle and a locking structure which are completely different from the existing locking principle are realized. Whether the first fastener and the second fastener are screwed or unscrewed, the motion trail of the second fastener is along the tooth profile of the thread surface teeth due to the constraint of the thread surface teeth, and the motion can be decomposed into the composition of two motions, namely: one of the movements is along the inclined plane of the helical surface at the root of the textured tooth, and the other movement is relative movement along the normal direction of the helical surface at the root of the textured tooth. The combined action of these two movements necessarily results in a significant increase in the axial force between the first fastener and the second fastener. This increase in axial force is reacted back through the textured teeth of the first fastener to the textured teeth of the second fastener, thereby preventing the tightening or loosening action. Since this increase in axial force is the internal force between the first and second fastening members by means of which loosening of the second fastening member is not possible, a permanent self-locking coupling is achieved when the first and second fastening members are brought together by the connecting element and the tightening torque of the second fastening member reaches the rated torque.
(2) In the invention, the first fastener to be prepared is extruded into a first fastener with a first threaded surface and a first common threaded surface by means of cold rubbing, warm rubbing or hot rubbing by means of a fixed rubbing plate and a movable rubbing plate or by means of a cold roller, a warm roller or a hot roller. And a second fastener having a second threaded land and a second common threaded land may be prepared using a land tooth tool. The first fastener and the second fastener are simple in mold structure, convenient to manufacture, low in cost and high in efficiency.
Drawings
FIG. 1 is a perspective view of a first fastener of a first embodiment of the present invention, viewed from an angle;
FIG. 2 is an enlarged partial schematic view at I of FIG. 1;
FIG. 3 is a perspective view of the first fastener of FIG. 1 from another angle;
FIG. 4a is a schematic view of a mold structure for a first fastener in accordance with a first embodiment of the present invention;
FIG. 4b is a schematic view of a mold structure for a first fastener in a third embodiment of the present invention;
FIG. 5 is a schematic view of the fixed washboard of FIG. 4 viewed in the direction of arrow J;
FIG. 6 is a schematic sectional view taken along line A-A of FIG. 5;
FIG. 7 is a schematic sectional view taken along line B-B in FIG. 5;
FIG. 8 is a schematic view of the movable washboard shown in FIG. 4 as viewed along the direction of arrow K;
FIG. 9 is a schematic sectional view taken along line C-C of FIG. 8;
FIG. 10 is a perspective view of a second fastener of a second embodiment of the invention, viewed from an angle;
FIG. 11 is an enlarged view of a portion of FIG. 10 at II;
FIG. 12 is a perspective view of the second fastener of FIG. 10 from another angle;
FIG. 13 is a schematic illustration of the production of a second fastener in accordance with a second embodiment of the invention;
fig. 14 is a schematic cross-sectional view of fig. 13 in accordance with the present invention.
Some of the reference numbers in the figures are as follows: 100-a first fastener; 101-straight rod part; 102-external threads; 103-thread surface of the thread surface; 104-common thread flank; 200-a second fastener; 201-a threaded hole; 202-internal thread; 203-thread face of the thread face; 204-common thread flank; 300-a tooth rubbing plate; 301-fixing washboard; 302-movable washboard; 303-a lathe bed; 304-a guide rail; 305-a toothed ramp; 306-normal bevel; 307-toothed ramp; 308-common inclined plane; 401-textured tooth cutter; 402-a guide mechanism; 403-fastener blank; 404-a workbench; 501-a first roller; 502-a second roller; 503-a first fastener is to be prepared; 504-baffle.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The invention provides a permanent self-locking threaded assembly, which comprises a first fastener 100 with external threads and a second fastener 200 with internal threads, wherein the first fastener 100 and the second fastener 200 are connected in a threaded mode. By "permanent" it is meant in this patent that the threaded component remains never loose for any load, including mechanical vibration, impact load, temperature stress, lubrication environment, stress creep, etc. The anti-loosening principle and the anti-loosening structure of the permanent self-anti-loosening threaded assembly are completely different from those of the prior art. It can be applied to threaded components of various sizes and shapes, and the differentiation of metric/imperial, coarse/fine, precision grade, and the like is no longer needed in the future. The permanent self-locking connection is realized when the first fastening piece and the second fastening piece are combined together by the connecting piece and the tightening torque of the second fastening piece reaches the rated torque.
Implementation mode one
As shown in fig. 1 to 3, the present embodiment discloses a first fastener 100, a mold for the first fastener 100, and a method for manufacturing the first fastener 100. The first fastener 100 includes a body having a straight shank portion 101, with an external thread 102 provided on the straight shank portion 101. While the first fastener 100 shown in fig. 1 is a hexagon head bolt, and the first half of the straight shaft 101 is provided with the external thread 102, in other embodiments of the present invention, the first fastener 100 may be other types of external thread fasteners such as a socket head cap screw, and the external thread 102 may be provided on the entire length of the straight shaft 101.
The outer surfaces of two sides of the thread of the external thread 102 are respectively a thread surface 103 with thread surface teeth and a common thread surface 104; the thread flanks 103 are located on the stressed side of the thread and the plain flanks 104 are located on the unstressed side of the thread. The normal thread surface 104 is the structure of the thread surface of the existing bolt, that is, the normal thread surface 104 is a smooth spiral curved surface. The thread surface 103 is provided with thread surface teeth uniformly distributed along the normal plane of the thread, the number of the thread surface teeth on each circle of external thread is equal, and the tooth profile parameters are the same. As can be seen from fig. 1 to 2, the thread surface teeth are triangular teeth formed by machining on the thread surface, and the ridge lines at the tips of the thread surface teeth extend in a radial direction from the axis of the straight rod portion 101.
As can be seen from fig. 1 and 3, the force-receiving side of the thread of the external thread 102 is the side close to the hexagonal head, and the non-force-receiving side is the opposite side. This threaded flank 103 comes into contact with the threaded flank surface of the corresponding internal thread of the nut when the workpieces to be connected are pre-tightened.
In the present embodiment, the male screw 102 is a triangular screw. The triangular cross section is formed by enclosing a thread surface 103 with thread surface teeth and a common thread surface 104. The external threads 102 may also be trapezoidal threads or T-threads.
Next, a production apparatus for producing the first fastener 100 of the present embodiment will be described.
Referring to fig. 4 to 9, the first fastener 100 in the present embodiment may be manufactured by a thread rolling machine. A thread rolling machine is mature production equipment in the field of bolt manufacturing. A thread rolling die 300 matched with the first fastener 100 is arranged on the thread rolling machine. The thread rolling plate 300 comprises a fixed rolling plate 1 and a movable rolling plate 4.
The fixed washboard 1 and the movable washboard 4 are both provided with oblique strip-shaped washboard structures for washboard.
The thread rolling structure on the fixed washboard 1 is composed of a toothed inclined surface 305 and a common inclined surface 306, and as shown in fig. 6 and 7, a sawtooth structure is arranged on the toothed inclined surface 305. The saw-tooth configuration can be used to form the thread flank 103 of the land on the first fastener 100 and the common chamfer 306 can be used to form the common thread flank 104 on the first fastener 100.
The thread rolling structure on the movable thread rolling plate 4 is composed of a toothed inclined surface 307 and a common inclined surface 308, and as shown in fig. 8 and 9, a sawtooth structure is arranged on the toothed inclined surface 307. The saw-tooth configuration can be used to form the thread flank 103 of the land on the first fastener 100 and the common chamfer 308 can be used to form the common thread flank 104 on the first fastener 100.
The fixed washboard 1 is fixedly arranged on a machine body 2 of the thread rolling machine. The movable washboard 4 is arranged on the guide rail 5, and the movable washboard 4 can reciprocate relative to the fixed washboard 1. In fig. 4, the position shown by the line DG is the alignment position of the fixed washboard 1 and the movable washboard 4, and is also the initial position of the first fastening member 100 during processing. The axis of the first fastener 100 is located on the line DG, and the diameter of the first fastener 100 is shown as the pitch diameter of the fastener in terms of the volume-invariant condition of the threaded portion.
In fig. 4a, the movable washboard 4 moves along the guide rail 5 with a speed v under the action of an external force. At this time, the fixed washboard 1 and the movable washboard 4 are constrained by the bed 2, the guide rail 5 and the first fastener 100 to be processed. When the front edge of the movable washboard 4 reaches the position shown by the line HL, the plastic deformation of the first fastener 3 to be processed is completely finished, and the first fastener automatically falls off from the position between the fixed washboard 1 and the movable washboard 4 under the action of gravity. In this process, the threaded portion of the first fastener 100 forms the desired threaded surface with the threaded surface teeth.
The working temperature for the plastic deformation of the first fastener 100 may be a cold deformation zone, a warm deformation zone, or a hot deformation zone of the material.
The first fastener disclosed by the embodiment of the invention can be combined with a matched second fastener disclosed by the following embodiment II, so that a brand-new thread surface and tooth thread pair relationship is constructed, and a locking structure completely different from the existing locking principle is realized. Whether the first fastener 100 and the second fastener 200 are screwed or unscrewed, the motion trail of the second fastener is along the tooth profile of the thread surface due to the restriction of the thread surface teeth, and the motion can be decomposed into two motions, namely, one motion is along the inclined surface of the thread surface at the root part of the thread surface teeth, and the other motion is along the normal direction of the thread surface. The combined action of these two movements necessarily results in a significant increase in the axial force between the first fastener 100 and the second fastener 200. This increase in axial force is reacted back through the textured teeth of first fastener 100 to the textured teeth of second fastener 200, thereby preventing the tightening or loosening action. Since this increment of axial force is an internal force between the first fastener 100 and the second fastener 200, it is not possible to take the second fastener loose by virtue of this internal force.
When the first fastener 100 and the second fastener 200 are combined together by the connecting piece and the tightening torque of the second fastener reaches the rated torque, the permanent self-locking coupling is realized.
Second embodiment
As shown in fig. 10 to 12, the embodiment of the present invention discloses a second fastening member 200 that can be used with the first fastening member 100 disclosed in the first embodiment. The second fastening member 200 includes a body having a threaded hole 201, and the outer surfaces of both sides of the thread of the internal thread 202 of the threaded hole 201 are a thread surface 203 and a normal thread surface 204. The thread surface 203 of the thread surface is positioned on the stressed side of the thread of the internal thread 202, and the common thread surface 204 is positioned on the unstressed side of the thread of the internal thread 202; the thread surface 203 of the thread surface teeth is provided with thread surface teeth which are uniformly distributed along the normal plane of the thread, the number of the thread surface teeth on each circle of internal thread 202 is equal, and the tooth profile parameters are the same. As can be seen from fig. 10 to 12, the thread surface teeth are triangular teeth formed on the thread surface, and the ridge lines of the tips of the thread surface teeth extend in a radial direction from the axis of the internal thread 202.
The body of the second fastener 200 may be in the form of a nut or nut, etc. The internal threads 202 may be triangular threads, trapezoidal threads, or T-shaped threads.
Next, a production apparatus for the second fastener 200 of the present embodiment will be described.
As shown in fig. 13 and 14, the production apparatus disclosed in this embodiment includes a grain face tooth cutter 401, a guide mechanism 402, a table 404, and a pressing device (not shown). The thread tooth tool 401 has a cylindrical structure, and has an external thread formed on an outer peripheral surface thereof and thread teeth formed on an outer surface of one side of the external thread. The guide mechanism 402 is fixed to the table 404, and a screw hole is provided in the guide mechanism 402.
The thread cutter 401 can be screwed into a threaded hole of the guide mechanism 402. Placing a fastener blank 403 with prefabricated internal threads in a centering position with the thread face tooth cutter 401, then screwing the thread face tooth cutter 401 so that a certain gap is formed between the fastener blank 403 and the guide mechanism, and then applying pressure F to the blank 403 by using a pressure device so that the fastener blank 403 is subjected to plastic deformation under the constraint of the boundary of the thread face tooth cutter 401. After the press is unloaded, corresponding textured teeth are formed on the fastener blank 403. After exiting the face cutter 401, the fastener blank 403 may be removed. At this time, the fastener blank 403 forms the second fastener 200 of the present embodiment.
Third embodiment
The first fastener preparation mold comprises a first roller 501, a second roller 502 and a stop block 504, a threaded portion of a first fastener to be prepared is clamped between the first roller 501 and the second roller 502, the stop block is arranged below the first fastener 503 to be prepared, a toothed inclined surface and a common inclined surface are arranged on roller surfaces of the first roller 501 and the second roller 502, the toothed inclined surface is used for forming a first thread surface of the threaded portion of the first fastener, and the common inclined surface is used for forming a first common thread surface of the first fastener.
The first roller 501 and the second roller 502 can rotate at a constant speed along the center point of the respective circle centers, and the center point O of the second roller 5022Can make linear reciprocating motion along the line segment O1O2 at a speed v, and a first fastener 503 to be prepared is placed between a first roller and a second roller, the first roller and the second roller rotate around respective circle centers at a constant speed, and a central point O of the second roller 5022Along line segment O1O2And the first thread surface and the first common thread surface required by the first fastener are formed by linear reciprocating motion.
As shown in FIG. 4b, the first roller 501 can only wrap around the fixed point O1And (4) rotating, wherein the rotating speed omega 1 has torque capacity T1 and is steplessly adjustable.
The second roller 502 can wind around O2And (4) rotating, wherein the rotating speed omega 2 has torque capacity T2 and is steplessly adjustable.
In addition, the second roller 502 center point O2May be along O1O2And makes a linear reciprocating motion. I.e. to the left at a speed V under the action of a force F, or to the right at a speed-V under the action of a force-F.
In preparation, when the part of the bolt blank to be threaded is placed between the first roller 501 and the second roller 502, the first roller 501 and the second roller 502 rotate at the same speed, and O2The second roller 502 is simultaneously moved along O by the force F1O2Moving to the left at a speed V, and obtaining the first fastener with the thread face teeth as long as the parameters T1, omega 1, T2, omega 2 and F, V and the thread parameters are matched, wherein the thread parameters and the thread parameters of the thread face of the bolt are matched.
Embodiment IV
The present embodiment discloses a permanent self-loosening prevention threaded assembly including the first fastener 100 prepared as the first embodiment or the first fastener 100 prepared as the third embodiment and the second fastener 200 prepared as the second embodiment. When the straight shank portion of the first fastener 100 is screwed into the threaded hole of the second fastener 200 and pre-tightened, the parameters of the thread face teeth of the first fastener and the second fastener are matched.
The second fastening member 200 disclosed in the embodiment of the present invention is used in combination with the first fastening member 100, thereby constructing a completely new thread-face-tooth-thread pair relationship, and realizing a completely different anti-loosening structure from the existing driving anti-loosening principle. Whether the first fastener 100 and the second fastener 200 are screwed or unscrewed, the motion trail of the second fastener is along the tooth profile of the thread surface due to the restriction of the thread surface teeth, and the motion can be decomposed into two motions, namely, one motion is along the inclined plane of the thread surface at the root part of the thread surface teeth, and the other motion is along the normal direction of the thread surface. The combined action of these two movements necessarily results in a significant increase in the axial force between the first fastener 100 and the second fastener 200. This increase in axial force is reacted back through the textured teeth of first fastener 100 to the textured teeth of second fastener 200, thereby preventing the tightening or loosening action. Since this increment of axial force is an internal force between the first fastener 100 and the second fastener 200, it is not possible to take the second fastener loose by virtue of this internal force.
When the first fastener 100 and the second fastener 200 are combined together by the connecting piece and the tightening torque of the second fastener reaches the rated torque, the permanent self-locking coupling is realized.
The invention also provides a preparation method of the permanent self-locking threaded component, which comprises the following steps:
s1, preparing a first fastener: the first fastener to be prepared is extruded and formed into a first fastener with a first threaded surface and a first common threaded surface by means of cold rubbing, warm rubbing or hot rubbing by means of a fixed rubbing plate and a movable rubbing plate or by means of a cold roller, a warm roller or a hot roller;
s2, preparing a second fastener: preparing a second fastener with a second threaded surface of the threaded surface and a second common threaded surface by using the threaded surface cutter;
and S3, screwing the straight rod part of the first fastener into the threaded hole of the second fastener and pre-tightening.
The first fastener and the second fastener are combined for use, so that a brand-new thread surface, tooth and thread pair relationship is established, and a locking principle and a locking structure which are completely different from the existing locking principle are realized. Whether the first fastener and the second fastener are screwed or unscrewed, the motion trail of the second fastener is along the tooth profile of the thread surface teeth due to the constraint of the thread surface teeth, and the motion can be decomposed into the composition of two motions, namely: one of the movements is along the inclined plane of the helical surface at the root of the textured tooth, and the other movement is relative movement along the normal direction of the helical surface at the root of the textured tooth. The combined action of these two movements necessarily results in a significant increase in the axial force between the first fastener and the second fastener. This increase in axial force is reacted back through the textured teeth of the first fastener to the textured teeth of the second fastener, thereby preventing the tightening or loosening action. Since this increase in axial force is the internal force between the first and second fastening members by means of which loosening of the second fastening member is not possible, a permanent self-locking coupling is achieved when the first and second fastening members are brought together by the connecting element and the tightening torque of the second fastening member reaches the rated torque.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (8)
1. A permanent self-locking threaded assembly, comprising: the fastening device comprises a first fastening piece with external threads and a second fastening piece with internal threads, wherein the first fastening piece and the second fastening piece are connected in a threaded mode.
The first fastener comprises a body with a straight rod part, the straight rod part is provided with an external thread, and the outer surfaces of two sides of the thread of the external thread are respectively a first threaded surface and a first common threaded surface; the first thread surface is positioned on the stressed side of the thread, and the first common thread surface is positioned on the unstressed side of the thread;
the second fastener comprises a body with a threaded hole, and the outer surfaces of two sides of an internal thread of the threaded hole are respectively a second thread surface tooth thread surface and a second common thread surface; the second thread surface is positioned on the stressed side of the internal thread, and the second common thread surface is positioned on the unstressed side of the internal thread;
the thread surface of the first thread surface tooth and the thread surface of the second thread surface tooth are respectively provided with thread surface teeth which are uniformly distributed along a thread normal plane, the number of teeth of each circle of thread surface teeth is equal, the tooth profile parameters are the same, and the straight rod part of the first fastener can be screwed into the thread hole of the second fastener and pre-tightened.
2. The permanent self-check threaded assembly of claim 1, wherein: the first fastener is a bolt or a screw, and the external thread of the first fastener is a triangular thread, a trapezoidal thread or a T-shaped thread.
3. The permanent self-check threaded assembly of claim 1, wherein: the internal thread of the second fastener is a triangular thread, a trapezoidal thread or a T-shaped thread.
4. A mold for preparing the permanent self-check threaded assembly of claim 1, wherein: the fastener manufacturing device comprises a first fastener manufacturing die and a second fastener manufacturing die.
5. The mold for making a permanent self-check threaded assembly according to claim 4, characterized in that: the first fastener preparation die is a thread rolling plate matched with the thread rolling machine, the thread rolling plate comprises a fixed thread rolling plate and a movable thread rolling plate, the fixed thread rolling plate is fixedly arranged on a machine body of the thread rolling machine, the movable thread rolling plate is arranged on a guide rail capable of sliding, and the movable thread rolling plate can move back and forth relative to the fixed thread rolling plate;
the fixed washboard and the movable washboard are respectively provided with an inclined strip-shaped washboard structure for washboard, the washboard structures of the fixed washboard and the movable washboard respectively comprise a toothed inclined surface and a common inclined surface, the toothed inclined surface is used for forming a first thread surface and a tooth thread surface of a first fastener, and the common inclined surface is used for forming a first common thread surface of the first fastener.
6. The mold for making a permanent self-check threaded assembly according to claim 4, characterized in that: the second fastener preparation die comprises a grained surface tooth cutter, a guide mechanism, a workbench and a pressure device, the grained surface tooth cutter is of a cylindrical structure, external threads are machined on the outer peripheral surface of the grained surface tooth cutter, grained surface teeth are machined on the outer surface of one side of the external threads, the guide mechanism is fixedly arranged on the workbench, and a threaded hole is formed in the guide mechanism;
the thread face tooth cutter can be screwed into a threaded hole of the guide mechanism, a fastener blank with a prefabricated internal thread is arranged in a centering position with the thread face tooth cutter, then the thread face tooth cutter is screwed in, a certain gap is formed between the fastener blank and the guide mechanism, then pressure F is applied to the blank by using a pressure device, the fastener blank is subjected to moulding deformation under the constraint of the boundary of the thread face tooth cutter, after the pressure device is unloaded, corresponding thread face teeth can be formed on the fastener blank, the fastener blank is taken away after the thread face tooth cutter is withdrawn, and at the moment, the fastener blank forms a second fastener.
7. The mold for making a permanent self-check threaded assembly according to claim 4, characterized in that: the first fastener preparation mold comprises a first roller, a second roller and a stop block, a threaded part of a first fastener to be prepared is clamped between the first roller and the second roller, the stop block is arranged below the first fastener to be prepared, a toothed inclined surface and a common inclined surface are arranged on the roller surfaces of the first roller and the second roller, the toothed inclined surface is used for forming a first thread surface tooth threaded surface of the threaded part of the first fastener, and the common inclined surface is used for forming a first common thread surface of the first fastener;
the first roller and the second roller can rotate at a constant speed along respective center points of circle centers, the center point of the second roller can do linear reciprocating motion along a connecting line of the center points of the two rollers at a speed v, a first fastener to be prepared is placed between the first roller and the second roller, the first roller and the second roller rotate at a constant speed, and the center point of the second roller does linear reciprocating motion along a connecting line of the center points of the two rollers at a speed v to form a first threaded surface and a first common threaded surface required by the first fastener.
8. A method of making the permanent self-check threaded assembly of claim 1, wherein: which comprises the following steps:
s1, preparing a first fastener: the first fastener to be prepared is extruded and formed into a first fastener with a first threaded surface and a first common threaded surface by means of cold rubbing, warm rubbing or hot rubbing by means of a fixed rubbing plate and a movable rubbing plate or by means of a cold roller, a warm roller or a hot roller;
s2, preparing a second fastener: preparing a second fastener with a second threaded surface of the threaded surface and a second common threaded surface by using the threaded surface cutter;
and S3, screwing the straight rod part of the first fastener into the threaded hole of the second fastener and pre-tightening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011505464.XA CN112648277A (en) | 2020-12-18 | 2020-12-18 | Permanent self-locking threaded component, and mold and method for preparing threaded component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011505464.XA CN112648277A (en) | 2020-12-18 | 2020-12-18 | Permanent self-locking threaded component, and mold and method for preparing threaded component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112648277A true CN112648277A (en) | 2021-04-13 |
Family
ID=75354891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011505464.XA Pending CN112648277A (en) | 2020-12-18 | 2020-12-18 | Permanent self-locking threaded component, and mold and method for preparing threaded component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112648277A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US113557A (en) * | 1871-04-11 | Improvement in metal screws and nuts | ||
| US3972359A (en) * | 1974-05-17 | 1976-08-03 | Standard Pressed Steel Co. | Vibration resistant fastener |
| US3972361A (en) * | 1972-05-30 | 1976-08-03 | Standard Pressed Steel Co. | Threaded fastener |
| JPH08170626A (en) * | 1994-12-15 | 1996-07-02 | Kameyama Hozumi | Thread part structure |
| US20150050102A1 (en) * | 2013-08-16 | 2015-02-19 | Hsiao-Shun Lu | Anti-Loose Screw and a Die Device for Forming Same |
| CN110332199A (en) * | 2019-06-27 | 2019-10-15 | 河海大学 | A kind of screw |
| CN111075825A (en) * | 2020-01-06 | 2020-04-28 | 杜责龙 | Never-loosening self-locking threaded connection structure |
-
2020
- 2020-12-18 CN CN202011505464.XA patent/CN112648277A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US113557A (en) * | 1871-04-11 | Improvement in metal screws and nuts | ||
| US3972361A (en) * | 1972-05-30 | 1976-08-03 | Standard Pressed Steel Co. | Threaded fastener |
| US3972359A (en) * | 1974-05-17 | 1976-08-03 | Standard Pressed Steel Co. | Vibration resistant fastener |
| GB1514205A (en) * | 1974-05-17 | 1978-06-14 | Standard Pressed Steel Co | Vibration-resistant fastener |
| JPH08170626A (en) * | 1994-12-15 | 1996-07-02 | Kameyama Hozumi | Thread part structure |
| US20150050102A1 (en) * | 2013-08-16 | 2015-02-19 | Hsiao-Shun Lu | Anti-Loose Screw and a Die Device for Forming Same |
| CN110332199A (en) * | 2019-06-27 | 2019-10-15 | 河海大学 | A kind of screw |
| CN111075825A (en) * | 2020-01-06 | 2020-04-28 | 杜责龙 | Never-loosening self-locking threaded connection structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2446242C (en) | Self-tapping screw, blank, method and dies for making the same and method for joining thin workpieces | |
| US7159429B2 (en) | Method and device for manufacturing bolt, screw rolling die used therefor, and multiple screw bolt | |
| US3789644A (en) | Self-locking dies for making threads | |
| US10519995B2 (en) | Dual-threaded screw structure | |
| JPWO2019230167A1 (en) | Double screw structure and its fastening body | |
| CN112648277A (en) | Permanent self-locking threaded component, and mold and method for preparing threaded component | |
| US6155761A (en) | Short point anti-cross-threading design | |
| US3520344A (en) | Self-locking screw thread | |
| JP2724099B2 (en) | Fastening member and method of manufacturing the same | |
| US6135892A (en) | Method of forming a short point anti-cross threading member | |
| JP3709183B2 (en) | Loosening bolt and manufacturing method thereof | |
| CN218625003U (en) | Boss self-locking fastener | |
| CN113464537A (en) | Hexagonal head bolt with hole and production process thereof | |
| JP3577098B2 (en) | Fastening device using deformation of internal thread | |
| CN209818480U (en) | High-strength arc threaded connection pair | |
| CN210769783U (en) | Nut anti-loosening composite washer | |
| TWI818983B (en) | Double screw structure and its fastening body | |
| US3631702A (en) | Self-locking threaded fasteners | |
| CN2536834Y (en) | Anti-loose self-lock thread | |
| CN220668111U (en) | Self-locking bolt | |
| CN218625002U (en) | Slope-shaped self-locking fastener | |
| CN111649055A (en) | Fastener capable of preventing loosening | |
| CN219366548U (en) | Anti-loosening structure for bolt and nut | |
| CN218151945U (en) | Novel locknut | |
| CN2351612Y (en) | V-shape slip-spring self-locking screw nut |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |