CN117869442A - Reducing tip guide bolt - Google Patents

Reducing tip guide bolt Download PDF

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Publication number
CN117869442A
CN117869442A CN202311750771.8A CN202311750771A CN117869442A CN 117869442 A CN117869442 A CN 117869442A CN 202311750771 A CN202311750771 A CN 202311750771A CN 117869442 A CN117869442 A CN 117869442A
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CN
China
Prior art keywords
diameter
screw
thread
bolt
head
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
Application number
CN202311750771.8A
Other languages
Chinese (zh)
Inventor
何巍
石玉红
王帅
蒋先旺
冯韶伟
王婕
卢红立
刘佳运
闫路
徐倩
姜周
吴会强
李操
宋漪萍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Institute of Astronautical Systems Engineering
Original Assignee
Beijing Institute of Astronautical Systems Engineering
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing Institute of Astronautical Systems Engineering filed Critical Beijing Institute of Astronautical Systems Engineering
Priority to CN202311750771.8A priority Critical patent/CN117869442A/en
Publication of CN117869442A publication Critical patent/CN117869442A/en
Pending legal-status Critical Current

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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
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts
    • F16B35/044—Specially-shaped ends
    • 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
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
    • F16B23/003—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool star-shaped or multi-lobular, e.g. Torx-type, twelve-point star
    • 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
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
    • F16B23/0038—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool substantially prismatic with up to six edges, e.g. triangular, square, pentagonal, Allen-type cross-sections
    • 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
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0092—Specially shaped nuts or heads of bolts or screws for rotations by a tool with a head engageable by two or more different tools
    • 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
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

The embodiment of the application provides a variable-diameter pointed guide bolt, which comprises a bolt head, a screw rod, a thread and a pointed main body, wherein the bolt head, the screw rod, the thread and the pointed main body are sequentially connected along the axial direction; the bolt head is an outer hexagon, and an inner hexagon or a 100-degree countersunk head is further arranged on the bolt head; the diameter of the screw is larger than the diameter of the thread. The variable-diameter tip guide bolt has an automatic guide function, meets the requirements of different bearing scenes through diameter variation, and meets the requirements of light weight and high reliability connection under the condition of unidirectional operation; the bolt head comprises two screwing structures of an outer hexagon and an inner hexagon, so that the screw bolt can meet different installation and operation space requirements, the screwing structure is formed by upsetting, and screwing performance can be effectively improved.

Description

Reducing tip guide bolt
Technical Field
The application relates to the technical field of fasteners, in particular to a variable-diameter tip guide bolt.
Background
For a general butt joint structure, a bolt is matched with a nut after passing through a through hole of a connected piece, an operator fixes the bolt at the bolt head side, and the connection is realized by screwing the nut at the nut side. In actual engineering, operators can only operate on one side due to the requirement of docking. For such unidirectionally operated docking structures, a pallet nut is typically mounted on the inside and an operator mounts a bolt on the outside to effect the connection. Due to assembly errors among the mounting holes of the connected pieces, the bolts and the supporting plate nuts, the axes of the bolts are not overlapped with the axes of the supporting plate nuts generally, and a reasonable guide structure is required to be arranged on the root of the bolts under the condition that the axes of the supporting plate nuts cannot be adjusted.
In addition, according to the bearing direction of bolt, divide into axial connection and radial connection two kinds, traditional axial connecting bolt its polished rod diameter is close with the screw pitch diameter, and to the bolt that plays radial connection effect, need increase polished rod diameter to satisfy the demand of different bearing scenes. Meanwhile, the operation installation space is extremely small in certain scenes, different screwing structures are integrated on the bolts, and the installation requirement can be well met.
Disclosure of Invention
In order to solve one of the technical defects, the embodiment of the application provides a variable-diameter tip guide bolt.
According to a first aspect of embodiments of the present application, there is provided a variable diameter pinnacle guide bolt comprising a bolt head, a shank, a thread and a pinnacle body,
the bolt head, the screw rod, the screw thread and the pinnacle main body are sequentially connected along the axial direction;
the bolt head is an outer hexagon, and an inner hexagon is further arranged on the bolt head;
the diameter of the screw is larger than the diameter of the thread.
Further, the screw is processed into a tensile screw or a shear screw according to different bearing directions of the connected piece.
Further, the screw is applied to a scene bearing axial load, and the diameter of the screw is rounded to the pitch diameter of the thread.
Further, the screw is applied to a radial load bearing scenario, designed with different diameters (D s ) Is arranged on the upper surface of the polished rod,
the shear stress τ caused by the external shear force Q is:
the pitch diameter of the screw thread of the bolt is D, and the tensile stress sigma caused by the pretightening force is:
wherein k is a pretightening force coefficient, and pretightening force takes the tensile load P of the bolt s 0.3 to 0.8 times of the maximum reduced tensile strength sigma according to the fourth strength theory 4 Should be less than the tensile load:
for a metal material, the shear limit load is 0.5 times of the tensile limit load, and k is 0.8 at maximum, so that the following can be obtained:
for bolts with radial load requirements, the screw diameter is 1.2 times the pitch diameter of the threads.
Further, the threads are formed by rolling or thread rolling.
Further, the threads are machined into M threads or MJ threads.
Furthermore, the tip main body is in a conical structure, the diameter of the cone is the same as the pitch diameter D of the thread, the cone is smoothly transited with the ending of the thread, the cone height is H, the cone angle is alpha, the head adopts a tip round head 11 for transition, and the radius of the tip round head is S R 。
Further, the calculation method of the volume V of the pinnacle body is as follows:
wherein:
the axial maximum dislocation of the floating support plate nut is deltah, and the radial maximum dislocation is delta, so that the bearing requirement of the floating support plate nut body is met:
the variable-diameter tip guide bolt provided by the embodiment of the application has an automatic guide function, and meets the requirements of light weight and high reliability connection under the condition of unidirectional operation by changing diameters to meet the requirements of different bearing scenes; the bolt head comprises two screwing structures of an outer hexagon and an inner hexagon, so that the screw bolt can meet different installation and operation space requirements, the screwing structure is formed by upsetting, and screwing performance can be effectively improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is an installation view of a variable diameter tip guide bolt and a connected component assembly of the present application.
Fig. 2 is a schematic structural view of the variable diameter tip guide bolt of the present application.
Fig. 3 is a schematic view of a root machining center hole of a variable-diameter tip guide bolt of the present application.
Fig. 4 is a second schematic view of a root machining center hole of the variable-diameter tip guide bolt.
Fig. 5 is a schematic view of a root tooling tip body of a variable diameter tip guide bolt of the present application.
In the figure, a 1-reducing pinnacle guide bolt, a 2-connected piece I, a 3-connected piece II, a 4-supporting plate nut, a 5-bolt head, a 6-screw, a 7-thread, an 8-thread ending, a 9-subhead fillet, a 10-pinnacle main body, a 11-pinnacle round head, a 12-internal hexagon and a 13-external hexagon are shown.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following detailed description of exemplary embodiments of the present application is given with reference to the accompanying drawings, and it is apparent that the described embodiments are only some of the embodiments of the present application and not exhaustive of all the embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The embodiment of the application provides a variable-diameter pinnacle guide bolt which comprises a bolt head 5, a screw rod 6, threads 7 and a pinnacle main body 11,
the bolt head 5, the screw rod 6, the thread 7 and the tip main body 11 are sequentially connected along the axial direction;
the bolt head 5 is an outer hexagon 13, and an inner hexagon 12 is also arranged on the bolt head 5;
the diameter of the screw 6 is greater than the diameter of the flight 7.
In this embodiment, the screw is processed into a tensile screw or a shear screw according to the bearing direction of the connected piece.
In this embodiment, the screw is applied to the scene of bearing axial load, and the diameter of the screw is rounded up to the pitch diameter of the thread.
In this embodiment, the screw is applied to a radial load bearing scenario, different diameters (D s ) Is arranged on the upper surface of the polished rod,
the shear stress τ caused by the external shear force Q is:
the pitch diameter of the screw thread of the bolt is D, and the tensile stress sigma caused by the pretightening force is:
wherein k is a pretightening force coefficient, and pretightening force takes the tensile load P of the bolt s 0.3 to 0.8 times of the maximum reduced tensile strength sigma according to the fourth strength theory 4 Should be less than the tensile load:
for a metal material, the shear limit load is 0.5 times of the tensile limit load, and k is 0.8 at maximum, so that the following can be obtained:
for bolts with radial load requirements, the screw diameter is 1.2 times the pitch diameter of the threads.
In the embodiment, the threads are formed by rolling or thread rolling, and the threads are processed into M threads or MJ threads.
In this embodiment, the tip main body has a conical structure, the diameter of the cone is the same as the pitch diameter D of the thread, the cone is smoothly transited with the thread ending, the cone height is H, the cone angle is alpha, the head adopts the tip round head 11 for transition, and the radius of the tip round head is S R 。
In this embodiment, the calculation method of the volume V of the tip body is as follows:
wherein:
the axial maximum dislocation of the floating support plate nut is deltah, and the radial maximum dislocation is delta, so that the bearing requirement of the floating support plate nut body is met:
examples
The bearing direction of a bolt with a certain butt joint structure needing unilateral operation is radial, and the diameter-variable pinnacle guide bolt designed in the application is selected. The floating support plate nut 4 is fixed with the connected piece II 3, and is installed and operated on the outer side of the connected piece I2 through the variable-diameter tip guide bolt 1 with the connected piece I2.
According to the bearing requirement, the bolt in the example is made of a 05Cr17Ni4Cu4Nb material with the specification of M10×1.5 and the strength grade of 1100MPa, the pitch diameter of the screw thread is 9.026mm, the total length of the required screw thread is 18mm, and the length of the screw rod is 2mm; the floating pallet nut is selected to have a standard of QJ2418-1992 of M10×1.5.
According to the calculation, the diameter of the screw rod is taken to be 1.2 times of the pitch diameter of the screw thread, and is 12mm.
The radial play of the floating pallet nut 4 is 0.75mm, the axial play is 0.35mm, and the minimum peak body height h= 4.835mm, the whole h=5 mm, is obtained by solving the following equation. Thus, the total length of the bolt, except for the head, was 28mm.
To ensure that the upper hexagon 13, the inner hexagon 12 and the pinnacle body 10 of the bolt head are formed according to the length of 54mm and the diameter ofAnd (3) blanking the steel bar. The end face of the head is formed by adopting a hot upsetting upper die, and the one-step upsetting forming of the head is realized on the basis of ensuring the size requirement by precisely controlling parameters such as heating temperature, heat preservation time, cooling time and the like, wherein the thickness is as followsThe under-head fillet 9 is initially finished in the hot heading process, and the under-head fillet 9 is roll-formed in the thread machining process, and the final radius is controlled to be +.>Through metallographic detection after upsetting forming, defects such as overheating and overburning are avoided, forging cracks are not allowed to exist in the outer hexagon 13, the inner hexagon 12 and other parts of the bolt head, and defects such as folding and hairline are not allowed to exist in the under-head fillet 9. After upsetting forming, the length of the root of the bolt is 31mm.
To complete the machining of the pinnacle body 10 and the pinnacle fillet 11, a center hole is machined in the root of the bolt, as shown in fig. 3.
The screw 6, the pinnacle body 10 and the pinnacle head 11 are finished by numerical control machining. Since the bearing direction is axial, the size of the screw 6 is controlled to beOn the basis, the length of the screw is kept to be 2mm, and the rest part is continuously subjected to finish turning so as to control the size of the threaded base part to be +.>See fig. 4.
In order to avoid the occurrence of screw flanging on the product peak main body 10, a chamfer structure of 20-25 degrees is added in the transition area between the peak main body 10 and the column section, as shown in fig. 5.
In the embodiment, the thread 7 is a rolled thread, and the thread forming is realized by controlling rolling force, rolling time, thread ending 8 and length, and the thread precision is 6h.
The processing is completed through numerical control processing. And after the integral processing and electropolishing are finished, carrying out surface treatment, wherein the surface treatment is selected from the modes of T35 nano coating, passivation, aluminum spraying and the like. The surface treatment selected in this example was a T35 nm coating with a pre-plating thickness of 5-8 μm. After surface treatment, detecting thread pass stop by using an M10X1.5-6 h precision ring gauge, wherein the pass stop is qualified and the stop gauge is within 2 buckles.
And (5) packaging and delivering the qualified product.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims (8)

1. A variable-diameter tip guide bolt is characterized by comprising a bolt head, a screw rod, threads and a tip main body,
the bolt head, the screw rod, the screw thread and the pinnacle main body are sequentially connected along the axial direction;
the bolt head is an outer hexagon, and an inner hexagon is further arranged on the bolt head;
the diameter of the screw is larger than the diameter of the thread.
2. The variable diameter pointed guide bolt according to claim 1, wherein the screw is processed into a tensile screw or a shear screw according to the bearing direction of the connected piece.
3. The variable diameter pointed guide bolt as claimed in claim 2, wherein the screw is applied in a scenario of bearing axial load, and the diameter of the screw is rounded to the pitch diameter of the thread.
4. Variable diameter pointed guide bolt according to claim 2, characterized in that the screw is applied in a radial load bearing scenario for different diameters (D s ) Is arranged on the upper surface of the polished rod,
the shear stress τ caused by the external shear force Q is:
the pitch diameter of the screw thread of the bolt is D, and the tensile stress sigma caused by the pretightening force is:
wherein k is a pretightening force coefficient, and pretightening force takes the tensile load P of the bolt s 0.3 to 0.8 times of the maximum reduced tensile strength sigma according to the fourth strength theory 4 Should be less than the tensile load:
for a metal material, the shear limit load is 0.5 times of the tensile limit load, and k is 0.8 at maximum, so that the following can be obtained:
for bolts with radial load requirements, the screw diameter is 1.2 times the pitch diameter of the threads.
5. The variable diameter pointed guide bolt as claimed in claim 1, wherein the thread is formed by rolling or thread rolling.
6. The variable diameter pointed guide bolt as claimed in claim 1 or 5, wherein the thread is machined as M thread or MJ thread.
7. The variable-diameter pinnacle guide bolt according to claim 1, wherein the pinnacle main body has a conical structure, the diameter of the cone is the same as the pitch diameter D of the thread, the cone smoothly transits with the thread ending, the height of the cone is H, the angle of the cone is alpha, the head transits by adopting a pinnacle round head 11, and the radius of the pinnacle round head is S R 。
8. The variable diameter tip guide bolt according to claim 7, wherein the volume V calculation method of the tip body is as follows:
wherein:
the axial maximum dislocation of the floating support plate nut is deltah, and the radial maximum dislocation is delta, so that the bearing requirement of the floating support plate nut body is met:
CN202311750771.8A 2023-12-19 2023-12-19 Reducing tip guide bolt Pending CN117869442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311750771.8A CN117869442A (en) 2023-12-19 2023-12-19 Reducing tip guide bolt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311750771.8A CN117869442A (en) 2023-12-19 2023-12-19 Reducing tip guide bolt

Publications (1)

Publication Number Publication Date
CN117869442A true CN117869442A (en) 2024-04-12

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ID=90593851

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6176665B1 (en) * 2000-01-21 2001-01-23 Illinois Tool Works, Inc. Threaded fastener and assembly
WO2016033312A1 (en) * 2014-08-27 2016-03-03 University Of Pittsburgh-Of The Commonwealth System Of Higher Education Magnesium enhanced/induced bone formation
CN207246193U (en) * 2017-06-29 2018-04-17 广州视源电子科技股份有限公司 Screw nail
CN110821942A (en) * 2019-10-25 2020-02-21 贵州航天精工制造有限公司 Quick-release lock for fairing cover cap
CN212055452U (en) * 2020-04-21 2020-12-01 成都成维精密机械制造有限公司 Bonding moving support plate nut
US20230349405A1 (en) * 2022-03-31 2023-11-02 Honda Motor Co., Ltd. Screw member, screw member fastening method, and screw member fastening device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6176665B1 (en) * 2000-01-21 2001-01-23 Illinois Tool Works, Inc. Threaded fastener and assembly
WO2016033312A1 (en) * 2014-08-27 2016-03-03 University Of Pittsburgh-Of The Commonwealth System Of Higher Education Magnesium enhanced/induced bone formation
CN207246193U (en) * 2017-06-29 2018-04-17 广州视源电子科技股份有限公司 Screw nail
CN110821942A (en) * 2019-10-25 2020-02-21 贵州航天精工制造有限公司 Quick-release lock for fairing cover cap
CN212055452U (en) * 2020-04-21 2020-12-01 成都成维精密机械制造有限公司 Bonding moving support plate nut
US20230349405A1 (en) * 2022-03-31 2023-11-02 Honda Motor Co., Ltd. Screw member, screw member fastening method, and screw member fastening device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
魏玉兰主编: "机械设计项目化教程", 30 November 2022, 机械工业出版社, pages: 243 - 250 *

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