WO2019043775A1 - Locking screw and method for manufacturing same - Google Patents

Locking screw and method for manufacturing same Download PDF

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Publication number
WO2019043775A1
WO2019043775A1 PCT/JP2017/030883 JP2017030883W WO2019043775A1 WO 2019043775 A1 WO2019043775 A1 WO 2019043775A1 JP 2017030883 W JP2017030883 W JP 2017030883W WO 2019043775 A1 WO2019043775 A1 WO 2019043775A1
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WO
WIPO (PCT)
Prior art keywords
screw
angle
thread
flank
groove
Prior art date
Application number
PCT/JP2017/030883
Other languages
French (fr)
Japanese (ja)
Inventor
芳隆 秋野
Original Assignee
芳隆 秋野
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.)
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Publication date
Application filed by 芳隆 秋野 filed Critical 芳隆 秋野
Priority to PCT/JP2017/030883 priority Critical patent/WO2019043775A1/en
Publication of WO2019043775A1 publication Critical patent/WO2019043775A1/en

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00—Thread cutting; Automatic machines specially designed therefor
    • B23G1/36—Thread cutting; Automatic machines specially designed therefor by grinding
    • B23G1/38—Thread cutting; Automatic machines specially designed therefor by grinding with grinding discs guided along the workpiece in accordance with the pitch of the required thread
    • 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
    • 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

Definitions

  • the present invention relates to a locking screw for preventing loosening of a screw member having a structure in which an external screw and a female screw are screwed to clamp and fix a fixed member, and a method of manufacturing the same.
  • This locking screw nut is a locking screw in which the thread of at least one of an external thread and an internal thread is formed in a wavelike manner along the helical wire of the thread, and the lead angle changes periodically.
  • Patent No. 5729697 gazette
  • the present invention was made in view of the above background art, and has an object to provide a locking screw that exerts a locking function of a nut reliably with a simple configuration and is inexpensive and inexpensive and a method of manufacturing the same. Do.
  • This invention is a locking screw used to fix a fixed member by an external thread and an internal thread, and flank surfaces of threads of the external thread are adjacent to each other on the valley bottom side of a thread groove between the threads.
  • the angle of the screw angle which is the angle of the valley angle which is an angle which the flank forms, and the angle of the screw angle which is the angle of the flank facing each other in the screw groove on the top side of the screw is different.
  • flanks of the thread are discontinuous at the bottom side flank that is the valley bottom side of the thread and the top side flank that is the top side of the thread And a flank boundary line which is a boundary between the discontinuous bottom side flank and the top side flank, and is a locking screw formed in a wavelike manner on the flank in a predetermined cycle.
  • flank boundary lines opposed to each other in the screw groove are formed symmetrically about the valley bottom.
  • flank boundaries located on both sides of the top of the thread are formed symmetrically about the top.
  • the wave shapes of the flank boundaries located on both sides of the top of the thread may be formed in different phases.
  • the thread of the male screw may be formed in a wave shape with respect to the spiral direction of the screw, and the lead angle may be periodically changed.
  • the flank boundary line is formed with a plurality of waves in one pitch lead of the male screw.
  • the flank boundary line is provided with a plurality of waves in one cycle of the change in the lead angle of the male screw.
  • the present invention is also a manufacturing method of a locking screw used for fixing a fixed member by an external thread and an internal thread, wherein the angle of the tip end of the flank faces of mutually facing thread grooves of the external thread to be manufactured.
  • a conical rotary tool having an apex angle equal to the formed angle, the rotary tool is abutted against the side surface of a cylindrical base material forming the male screw, and the rotary tool is rotated to lead the male screw
  • the rotary tool is relatively moved in a spiral with a constant radius at a corner to cut the side of the base material to form the thread groove, wherein the position of the rotary tool is in the longitudinal direction of the male screw
  • a locking screw which is changed in the direction of the central axis at a constant cycle, and in which the lead angle is changed at the constant cycle with respect to the average lead angle to form the screw groove in a wave shape of the wavelength of the constant cycle. Manufacturing method.
  • the present invention is also a manufacturing method of a locking screw used to fix a fixed member by an external thread and an internal thread, and the angles of the tip face each other on the top side of the thread of the external thread to be manufactured.
  • a conical second rotary tool having an apex angle equal to the angle of the tip angle which is the angle formed by the flanks, and a conical second apex having an apex angle smaller than the root angle of the thread groove between the threads.
  • the first rotary tool is brought into contact with the side surface of a cylindrical base material provided with a rotary tool and forming the male screw, and the first rotary tool is rotated so that the lead angle of the male screw is constant.
  • a conical second rotary tool having an apex angle smaller than an angle of a bottom of a thread groove between the threads, and a conical first rotary tool having an apex angle equal to an angle of a screw tip angle which is an angle of And the second rotary tool is brought into contact with the side surface of the cylindrical base material forming the male screw, and the second rotary tool is rotated to have a constant radius at the lead angle of the male screw.
  • the second rotary tool is relatively moved in a spiral manner to cut the side surface of the base material to form the screw groove, and at this time, the second rotary tool has a central axis of the male screw.
  • the first rotary tool is relatively moved in a spiral at the lead angle of the male screw to cut the side surface of the base material, and the side surface is spirally formed with a constant radius at the lead angle of the male screw.
  • Forming a thread groove by the thread forming a bottom side flank surface on the valley bottom side of the thread groove and a top side flank surface on the top side of the thread in a discontinuous surface; It is a manufacturing method of the locking screw which forms the flank boundary line which is a boundary in the wavelike form along the flank in the cycle.
  • the locking screw manufactured by the manufacturing method is used as a master, the shape of the screw groove is transferred to another member, and the surface shape of the transferred member is transferred to another cylindrical base material to transfer It is a manufacturing method of the locking screw which rolls an external thread.
  • the locking screw manufactured by the manufacturing method is used as a first master, and the shape of the screw groove is transferred to the first flat member, and the surface shape of the transferred member is the second master. And transfer the external thread to the second master, transfer the screw groove of the second master to a second flat member, and The bolt having the male screw is rolled from a flat plate member of 2.
  • the lead angle of the screw groove is formed in a wave shape which is changed at the fixed cycle with respect to the average lead angle, and then the screw groove of the flat member is removed.
  • It is a manufacturing method of the locking screw which pressure-fits the side of a cylindrical base material which forms an external thread, and rolls the external thread on the side of the base.
  • the screw locking function can be effectively and reliably exhibited with a simple structure and without using special parts, and it is easy to manufacture and mass-produce. It is possible and inexpensive.
  • FIG. 5 is a cross-sectional view taken along the line BB in FIG. 4;
  • FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4;
  • FIG. 5 is a cross-sectional view taken along a line DD in FIG.
  • FIG. 6 is a cross-sectional view showing a cross section of the locking screw of this embodiment taken along the bottom of the screw; It is a fragmentary sectional view showing the screwing state of the bolt of a locking screw of this embodiment, and a nut. It is a fragmentary sectional view showing the screwing state in other positions of the bolt of a locking screw of this embodiment, and a nut.
  • the locking screw of this embodiment is an external thread 12 formed on a bolt 10. As shown in FIG. 1, the bolt 10 holds and fixes the fixing member 16 between the nut 14 and the head portion 11 of the bolt 10 in the same manner as a normal bolt.
  • the male screw 12 advances in the axial direction only by the lead L in one rotation of the bolt 10, and is orthogonal to the axial direction of the male screw 12 of the bolt 10 of the outer diameter D as shown in FIGS.
  • the inclination angle of the spiral winding 12a of the male screw 12 with respect to the surface is the lead angle ⁇ .
  • the thread 18 is formed in a wave shape in the axial direction at a constant cycle, and the wave of the wave thread 18 is formed. Is formed of a continuous periodic wavy curve such as a sine curve.
  • the wave period of the thread 18 is 90 ° with respect to 360 ° of one rotation of the male screw 12, and the screw 18 has a wave shape of the wavelength W in four cycles during one round of the circumferential surface of the male screw 12. It is formed.
  • the lead angle ⁇ (> 0) during one cycle of the undulating thread 18 is, as shown in FIG. 3 (b), maximum variation ⁇ with respect to the average lead angle ⁇ ave (> 0) of the male screw 12
  • the nut 14 is 360.degree. There appears a location where pressure contact and deformation occur periodically in the interval between In this embodiment, since one wavelength W of the wave of the screw thread 18 has a period of 90 °, this pressure-contacting portion is formed between the circumferential surfaces 360 ° of the threaded portion of the male screw 12 and the nut 14. Waves are formed. Therefore, eight pressure contact parts are formed in the plus and minus directions in the screw advancing direction.
  • the external thread 12 and the nut 14 of the bolt 12 are screw threads 18 of the external thread 12 at a portion where the lead angle is the largest and a portion where the lead angle is the smallest on the waved circumferential surface in a state where no load is exerted by tightening.
  • the pressure is exerted strongly, and the threads 18 of each of the male screw 12 and the nut 14 are displaced relative to each other to be elastically deformed and pressure-welded.
  • the central thread 18 portion equal to the average lead angle ⁇ ave of the lead angle ⁇ which changes in a wavelike manner, the same contact state as the normal screw is achieved.
  • the valley line 21 of the valley bottom of the thread groove 20 is in the radial direction of the cross section of the male screw 12 with respect to the spiral direction Y of the thread 18. , And has a wave form with a constant cycle wavelength m and an amplitude in the thread direction.
  • the flanks 22 of the thread 18 of the male screw 12 are valley lines 21 at the bottom of the thread groove 20, and the value of the angle of the valley angle ⁇ formed by the adjacent bottom flanks 22a and the top of the thread 18 In the vicinity of 18a, the values of the angle of the screw tip angle ⁇ formed by the top flanks 22b facing each other in the screw groove 20 are different.
  • the angle of the screw tip angle ⁇ is slightly larger than the angle of the valley angle ⁇ , and the difference between the values is more than 0 ° and not more than 10 °.
  • the standard angle formed by the flanks 22 of the thread groove 20 is ⁇
  • the value of ⁇ is at most 10 °, preferably 1 ° to 5 °, and is appropriately set according to the application of the screw.
  • flanks 22 of the thread 18 are discontinuous from the bottom flank 22a, which is the surface on the valley line 21 side of the thread groove 20, and the top flank 22b, which is the surface on the top 18a of the thread 18. is there. Therefore, a flank boundary 24 is formed at the boundary between the discontinuous bottom flank 22a and the top flank 22b.
  • the edge of the cross section of the top flank 22b along the spiral direction Y is formed in a straight line when developed along the spiral direction Y. That is, as shown in FIG. 6, the end of the cross section in the spiral direction Y connecting the apex c on the top 18a side of the flank boundary 24 is formed in a straight line.
  • FIG. 6 the end of the cross section in the spiral direction Y connecting the apex c on the top 18a side of the flank boundary 24 is formed in a straight line.
  • the end of the cross section in the spiral direction Y connecting the vertex d on the valley line 21 side of the flank boundary line 24 becomes a curve that repeats unevenness periodically at the wavelength m.
  • the flank boundary line 24 is formed on the flank surface 22 of the thread 18 so as to draw a wave in the vertical direction along the spiral direction Y at a wavelength m of a fixed cycle.
  • the thread 18 of the male screw 12 is such that the depth of the valley bottom changes at the wavelength m of the period with the same phase as the waveform of the flank boundary line 24 and the height direction of the thread 18 of the wave of the valley line 21
  • the amplitude h of the light is very small compared to the wavelength m, as shown in FIG.
  • flank boundaries 24 opposed to each other in the screw groove 20 are formed symmetrically about the valley line 21 of the valley bottom.
  • the wave shapes of the flank boundaries 24 located on both sides of the top 18 a of the thread 18 are formed symmetrically about the top 18 a.
  • the wave shapes of the flank boundaries 24 located on both sides of the top 18 a of the screw thread 18 may not be symmetrical, and the phases of the wave shapes may be different.
  • the flank boundary line 24 forms a plurality of waves of wavelength m in the lead of one pitch of the male screw 12.
  • the wavelength m corresponds to the wavelength W of the wave in the spiral direction Y of the male screw 12.
  • And is formed at a wavelength of 1/4. Therefore, in the lead of one pitch of the male screw 12, 16 waves of wavelength m are formed.
  • the tip angle is in the vicinity of the top 18 a of the thread 18 of the male screw 12 to be manufactured
  • a conical first rotary tool 30 having an apex angle equal to the angle of the screw tip angle ⁇ formed by the top flanks 22b facing each other in the screw groove 20 is abutted, and the first rotary tool 30 is rotated,
  • the first rotary tool 30 is moved relative to the base 26 in a helical manner at a lead angle ⁇ of the male screw 12 and at a constant radius along the circumference, and the side of the base 26 is cut.
  • the screw groove 20 is formed in a spiral shape at the lead angle ⁇ of the male screw 12 at the depth of the screw groove 20 on the side surface 32 of the base 26.
  • the conical second rotary tool 34 which is the apex angle of the valley angle ⁇ smaller than the screw tip angle ⁇ , is brought into contact with the valley bottom of the screw groove 20, and the second rotary tool 34
  • the valley bottom of the thread groove 20 is cut along a relatively spiral movement at a lead angle ⁇ of the male screw 12.
  • the second rotary tool 34 is reciprocated in the radial direction of the male screw 12 toward the central axis of the male screw 12 in a predetermined cycle.
  • a groove having a valley angle ⁇ is formed on the bottom side of the screw groove 20 at an angle smaller than the angle of the screw tip angle ⁇ of the screw groove 20.
  • the bottom side flank surface 22a on the valley bottom side of the screw groove 20 and the top side flank surface 22b on the top 18a side of the thread 18 are formed as discontinuous surfaces and are boundaries of the discontinuous surfaces.
  • a flank boundary 24 is formed in the helical direction Y along the flank 22 at a constant period of wavelength m.
  • the lead angle ⁇ of the male screw 12 is maximum variation ⁇ ⁇ with respect to the average lead angle ⁇ ave (> 0).
  • the first rotary tool 30 may be formed in a wave shape of the wavelength W while changing in the direction of the longitudinal central axis of the male screw 12. At this time, also when the valley angle ⁇ is formed by the second rotary tool 34, the lead angle ⁇ is changed at the wavelength W by the maximum change amount ⁇ ⁇ .
  • the screw thread 18 is formed in a wave shape in which the lead angle ⁇ of the male screw 12 changes by ⁇ ⁇ and the wavelength W, and the flank surface 22 of the screw groove 20 is in the height direction of the screw thread 18, In the depth direction of 20, it is possible to form an external thread 12 that changes periodically at wavelength m.
  • the flank surface 22 has a wave-like lead angle without forming the flank boundary line 24. It may be used as a bolt.
  • the base 26 of the bolt 10 is moved relative to the base 26 of the bolt 10 in a spiral relative to the lead angle ⁇ of the male screw 12.
  • the screw groove 20 may be formed first.
  • a waveform of a predetermined cycle in the depth direction of the screw groove 20 Form the valley line 21 and form a groove with a valley angle ⁇ .
  • the first rotary tool 30 moves the spiral groove relatively at the lead angle ⁇ in the screw groove 20 of the male screw 12 to form only the top side flank surface 22 b with the screw tip angle ⁇ good.
  • the screw thread 18 may be formed in a wave shape in which the lead angle ⁇ changes by ⁇ ⁇ and the wavelength W, and depending on the application, the screw groove 20 is formed in the base 26 of the bolt 10 with the second rotary tool 34 In this state, the flank surface 22 may be used as a bolt having a wavy lead angle without forming the flank boundary line 24.
  • the bottom flank 22a and the top flank 22b of the thread 18 are formed in a discontinuous surface, and the flank boundary 24 of the boundary of the discontinuous surface has a wave shape of wavelength m.
  • the flank boundary line 24 is more strongly in pressure contact with the thread 38 of the nut 14 than the other portions. That is, the thread 38 of the nut 14 with which the flank boundary line 24 is in pressure contact is the position where the maximum pressure contact force is applied. The position at which the maximum pressure contact force acts changes periodically in the height direction of the screw thread 38 at the wavelength m, and the bolt 10 and the nut 14 are screwed together.
  • the balance of the force applied to the thread 18 of the external thread 12 of the bolt 10 can be divided into the force in the direction perpendicular to the force in the direction of contacting the flank boundary line 24 of the boundary.
  • the pressure contact force between the bolt 10 and the screw of the nut 14 as a whole is less likely to loosen and the pressure contact state can be reliably maintained.
  • the male screw 12 as a master is formed on a cylindrical base material of metal harder than a normal bolt.
  • the master male screw 12 is transferred to a flat die plate (not shown) used for mass production of the bolt 10.
  • the wavelike screw thread 18 of the above embodiment is rolled on the side surface of the bolt for mass production.
  • the male screw of the locking screw manufactured by the above manufacturing method is used as a first master, and the shape of the screw groove is transferred to the first flat plate member, and the surface shape of the transferred member is a second shape.
  • Transfer to a cylindrical base material to be a master form the male screw 12 on the second master, transfer the screw groove of the second master to the second flat plate member, and this second flat plate shape
  • the component 10 may be used to roll a bolt 10 which is a mass-produced product.
  • the screw groove may be formed by the screw thread directly on the flat die plate by electric discharge machining, cutting, etc., and the male screw 12 as a master may be formed by rolling based on this, as it is You may roll a bolt for mass production.
  • the bolt 10 of the locking screw is formed on the flanks 22 of the thread 18 of the external thread 12 so as to form a bottom flank 22a and a top flank 22b, which are discontinuous faces with slightly different flank angles.
  • the wavelike flank boundary 24 is formed at the boundary.
  • the lead angle ⁇ so as to change at the wavelength W of a constant cycle, as shown in FIGS. 11 and 12, in the state where the bolt 10 and the nut 14 are screwed together, each other's threads 18, 38 There are partially different forces acting, causing elastic deformation and pressure welding.
  • the thread 18 of the bolt 10 is pressed against the thread 38 of the nut 14 more strongly periodically, and the thread 18 is elastically deformed.
  • the nut 14 used here may be a screw nut in general, and there is no need to use a nut of a special structure, the cost can be reduced at low cost.
  • the wavelength of the wave formed in the screw thread 18 can be suitably set other than the said embodiment.
  • the wave periods of the wave of wavelength m and the wave of wavelength W may be multiples of 3 in one round of the screw other than 22.5 ° and 90 °.
  • the values of the maximum lead angle and the minimum lead angle may be appropriately set according to the application and performance of the screw, and the screw may be applied to a multi-threaded screw other than a single-threaded screw. is there.

Abstract

Provided are: a low-cost locking screw that, with a simple configuration, reliably exhibits a nut-locking function; and a method for manufacturing the screw. Flank surfaces 22 of a screw thread 18 of a male screw 10 are designed such that an angle γ of a thread angle, which is the angle formed by flank surfaces 22 adjacent to each other on the root side of a screw groove 20, and an angle δ of a screw tip angle, which is the angle formed by flank surfaces 22 that face each other in the screw groove 20 in a crest 18a side of the screw thread 18, are different from each other. The angle δ of the screw tip angle is greater than the angle γ of the thread angle. Each flank surface 22 of the screw thread 18 is designed such that a root-side flank surface 22a, which is the surface on the root side of the screw groove 20, and a crest-side flank surface 22b, which is the surface on the crest 18a side of the screw thread 18, are noncontinuous. Flank border lines 24, which are the borders between the noncontinuous root-side flank surfaces 22a and crest-side flank surfaces 22b, are formed in an undulating shape in the flank surfaces 22 at prescribed cycles.

Description

緩み止めネジとその製造方法Locking screw and method of manufacturing the same
　この発明は、雄ネジと雌ネジを螺合させて、被固定部材を締め付けて固定する構造のネジ部材の緩みを防止する緩み止めネジとその製造方法に関する。 The present invention relates to a locking screw for preventing loosening of a screw member having a structure in which an external screw and a female screw are screwed to clamp and fix a fixed member, and a method of manufacturing the same.
　従来、ボルトに螺合したナットの緩み止め方法として、ダブルナットによる締め付けが一般的に用いられている。しかし、ダブルナットは、ナット同士の締め付け力による摩擦により、互いのナットを固定しているもので、長期間の耐久性や振動に弱いものであった。 2. Description of the Related Art Conventionally, as a method of preventing the loosening of a nut screwed to a bolt, a double nut fastening is generally used. However, the double nuts fix each other's nuts by friction due to the tightening force between the nuts, and are weak to long-term durability and vibration.
　そこで、より確実な緩み止めの構造として、ナットに種々の工夫を施した緩み止め装置も提案されている。しかし、これらの緩み止め装置は、部品点数が多くなり、コストがかかるとともに締結部分の構造が大きくなって、重量の増加やスペースの問題があった。 Therefore, a locking device in which various ideas have been applied to the nut has been proposed as a more reliable locking structure. However, these locking devices have a large number of parts, are costly, have a large structure of the fastening portion, and have problems of weight increase and space.
　そこで、比較的シンプルな構造の緩み止めナットとして、特許文献１に開示されている緩み止めネジがある。この緩み止めネジナットは、雄ネジと雌ネジの少なくとも一方のネジ山がネジのつる巻線に沿って波状に形成され、リード角が周期的に変化する緩み止めネジである。 Therefore, there is a locking screw disclosed in Patent Document 1 as a locking nut having a relatively simple structure. This locking screw nut is a locking screw in which the thread of at least one of an external thread and an internal thread is formed in a wavelike manner along the helical wire of the thread, and the lead angle changes periodically.
特許第５７２９６９７号公報Patent No. 5729697 gazette
　しかしながら、上記特許文献１に開示された緩み止めネジの従来の製造方法は比較的難しく、コストがかかるものであった。 However, the conventional method of manufacturing the locking screw disclosed in Patent Document 1 is relatively difficult and expensive.
　この発明は、上記背景技術に鑑みて成されたもので、簡単な構成で、確実にナットの緩み止め機能を発揮し、コストも安価な緩み止めネジとその製造方法を提供することを目的とする。 SUMMARY OF THE INVENTION The present invention was made in view of the above background art, and has an object to provide a locking screw that exerts a locking function of a nut reliably with a simple configuration and is inexpensive and inexpensive and a method of manufacturing the same. Do.
　この発明は、雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジであって、前記雄ネジのネジ山のフランク面は、前記ネジ山間のネジ溝の谷底側で互いに隣接する前記フランク面が成す角度である谷角の角度と、前記ネジ山の頂部側において前記ネジ溝で互いに対面する前記フランク面の成す角度であるネジ先角の角度が異なり、前記ネジ先角の角度が前記谷角の角度より大きく、前記ネジ山のフランク面は、前記ネジ溝の谷底側の面である底側フランク面と、前記ネジ山の頂部側の面である頂部側フランク面が不連続に形成され、不連続な前記底側フランク面と前記頂部側フランク面の境界であるフランク境界線が、所定の周期で前記フランク面に波状に形成されている緩み止めネジである。 This invention is a locking screw used to fix a fixed member by an external thread and an internal thread, and flank surfaces of threads of the external thread are adjacent to each other on the valley bottom side of a thread groove between the threads. The angle of the screw angle which is the angle of the valley angle which is an angle which the flank forms, and the angle of the screw angle which is the angle of the flank facing each other in the screw groove on the top side of the screw is different. Is greater than the angle of the valley angle, and the flanks of the thread are discontinuous at the bottom side flank that is the valley bottom side of the thread and the top side flank that is the top side of the thread And a flank boundary line which is a boundary between the discontinuous bottom side flank and the top side flank, and is a locking screw formed in a wavelike manner on the flank in a predetermined cycle.
　さらに前記雄ネジの前記ネジ山は、前記谷底の深さが前記フランク境界線の前記周期で、同位相で変化するものである。また、前記ネジ溝で互いに対向するフランク境界線は、前記谷底を中心に対称に形成されている。 Further, the thread of the male screw is such that the depth of the valley bottom changes in the same phase in the cycle of the flank boundary line. Further, flank boundary lines opposed to each other in the screw groove are formed symmetrically about the valley bottom.
　前記ネジ山の頂部を挟んで両側に位置する前記フランク境界線は、前記頂部を中心に対称に形成されているものである。または、前記ネジ山の頂部を挟んで両側に位置する前記フランク境界線の波形状は、異なる位相で形成されているものでも良い。 The flank boundaries located on both sides of the top of the thread are formed symmetrically about the top. Alternatively, the wave shapes of the flank boundaries located on both sides of the top of the thread may be formed in different phases.
　前記雄ネジのネジ山が、ネジの螺旋方向に対して波状に形成され、リード角が周期的に変化しているものでも良い。 The thread of the male screw may be formed in a wave shape with respect to the spiral direction of the screw, and the lead angle may be periodically changed.
　前記フランク境界線は、前記雄ネジの１ピッチのリード中で、複数の波が形成されている。また、前記フランク境界線は、前記雄ネジの前記リード角の変化の１周期中に、複数の波が設けられていると良い。 The flank boundary line is formed with a plurality of waves in one pitch lead of the male screw. Preferably, the flank boundary line is provided with a plurality of waves in one cycle of the change in the lead angle of the male screw.
　またこの発明は、雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法であって、先端の角度が、製造する前記雄ネジのネジ溝の互いに対面するフランク面の成す角度と等しい頂角の円錐状の回転工具設け、前記雄ネジを形成する円柱状の基材の側面に、前記回転工具を当接させ、前記回転工具を回転させて、前記雄ネジのリード角で一定の半径の螺旋状に、前記回転工具を相対的に移動させて前記基材の側面を切削し前記ネジ溝を形成し、その際、前記回転工具の位置を前記雄ネジの長手方向中心軸の方向に一定の周期で変化させ、前記リード角を、平均リード角に対して前記一定の周期で変化させて、前記一定の周期の波長の波状に前記ネジ溝を形成する緩み止めネジの製造方法である。 The present invention is also a manufacturing method of a locking screw used for fixing a fixed member by an external thread and an internal thread, wherein the angle of the tip end of the flank faces of mutually facing thread grooves of the external thread to be manufactured. A conical rotary tool having an apex angle equal to the formed angle, the rotary tool is abutted against the side surface of a cylindrical base material forming the male screw, and the rotary tool is rotated to lead the male screw The rotary tool is relatively moved in a spiral with a constant radius at a corner to cut the side of the base material to form the thread groove, wherein the position of the rotary tool is in the longitudinal direction of the male screw A locking screw which is changed in the direction of the central axis at a constant cycle, and in which the lead angle is changed at the constant cycle with respect to the average lead angle to form the screw groove in a wave shape of the wavelength of the constant cycle. Manufacturing method.
　またこの発明は、雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法であって、先端の角度が、製造する前記雄ネジのネジ山の頂部側において互いに対面するフランク面の成す角度であるネジ先角の角度と等しい頂角の円錐状の第一の回転工具と、前記ネジ山間のネジ溝の谷底の角度よりも小さい頂角を有する円錐状の第二の回転工具と設け、前記雄ネジを形成する円柱状の基材の側面に、前記第一の回転工具を当接させ、前記第一の回転工具を回転させて、前記雄ネジのリード角で一定の半径の螺旋状に、前記第一の回転工具を相対的に移動させて、前記基材の側面を切削し、前記雄ネジのリード角で螺旋状に前記側面に前記ネジ溝を形成し、この後、前記第二の回転工具を前記ネジ溝の谷底に当接させ、前記第二の回転工具で前記ネジ溝に沿って、前記雄ネジのリード角で螺旋状に相対的に移動させて前記ネジ溝の谷底を切削し、このとき前記第二の回転工具を、前記雄ネジの中心軸に向かって前記雄ネジの半径方向に所定の周期で往復させるとともに、前記雄ネジのリード角で螺旋状に移動させて、前記ネジ溝の前記ネジ先角の角度よりも小さい角度の、前記ネジ溝の谷底側の谷角を形成し、前記ネジ溝の谷底側の底側フランク面と、前記ネジ山の頂部側の頂部側フランク面を不連続な面に形成し、前記不連続な面の境界であるフランク境界線を、前記周期で前記フランク面に沿って波状に形成する緩み止めネジの製造方法である。 The present invention is also a manufacturing method of a locking screw used to fix a fixed member by an external thread and an internal thread, and the angles of the tip face each other on the top side of the thread of the external thread to be manufactured. A conical second rotary tool having an apex angle equal to the angle of the tip angle which is the angle formed by the flanks, and a conical second apex having an apex angle smaller than the root angle of the thread groove between the threads. The first rotary tool is brought into contact with the side surface of a cylindrical base material provided with a rotary tool and forming the male screw, and the first rotary tool is rotated so that the lead angle of the male screw is constant. Relatively moving the first rotary tool in the form of a spiral of radius, cutting the side surface of the base material, and forming the screw groove on the side surface in a spiral form at a lead angle of the male screw; Thereafter, the second rotary tool is brought into contact with the bottom of the screw groove, The spiral groove is relatively moved along the screw groove at the lead angle of the male screw with the second rotary tool to cut the bottom of the screw groove, and at this time, the second rotary tool is The screw is reciprocated in the radial direction of the male screw in a predetermined cycle toward the central axis of the male screw, and is helically moved at the lead angle of the male screw, and smaller than the angle of the thread tip angle of the screw groove The valley side of the valley bottom side of the screw groove is formed, and the bottom side flank surface on the valley bottom side of the screw groove and the top side flank surface on the top side of the screw thread are formed as discontinuous surfaces; It is a manufacturing method of a locking screw which forms a flank boundary line which is a boundary of a discontinuous face in a wavelike manner along the flank face in the cycle.
　またこの発明は、雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法において、先端の角度が、製造する前記雄ネジのネジ山の頂部側において互いに対面するフランク面の成す角度であるネジ先角の角度と等しい頂角の円錐状の第一の回転工具と、前記ネジ山間のネジ溝の谷底の角度よりも小さい頂角を有する円錐状の第二の回転工具と設け、前記雄ネジを形成する円柱状の基材の側面に、前記第二の回転工具を当接させ、前記第二の回転工具を回転させて、前記雄ネジのリード角で一定の半径の螺旋状に、前記第二の回転工具を相対的に移動させて、前記基材の側面を切削し前記ネジ溝を形成し、このとき前記第二の回転工具を、前記雄ネジの中心軸に向かって前記雄ネジの半径方向に所定の周期で往復させて、前記ネジ溝の前記谷角を形成し、この後、前記第一の回転工具を、前記ネジ山の頂部側の前記フランク面に当接させ、前記第一の回転工具を回転させて、前記雄ネジのリード角で螺旋状に、前記第一の回転工具を相対的に移動させて、前記基材の側面を切削し、前記雄ネジのリード角で一定の半径の螺旋状に前記側面に前記ネジ山によるネジ溝を形成し、前記ネジ溝の谷底側の底側フランク面と、前記ネジ山の頂部側の頂部側フランク面を不連続な面に形成し、前記不連続な面の境界であるフランク境界線を、前記周期で前記フランク面に沿って波状に形成する緩み止めネジの製造方法である。 Further, according to the present invention, in a method of manufacturing a locking screw used to fix a fixed member by an external thread and an internal thread, flanks whose tip angles face each other on the top side of the thread of the external thread to be manufactured. And a conical second rotary tool having an apex angle smaller than an angle of a bottom of a thread groove between the threads, and a conical first rotary tool having an apex angle equal to an angle of a screw tip angle which is an angle of And the second rotary tool is brought into contact with the side surface of the cylindrical base material forming the male screw, and the second rotary tool is rotated to have a constant radius at the lead angle of the male screw. The second rotary tool is relatively moved in a spiral manner to cut the side surface of the base material to form the screw groove, and at this time, the second rotary tool has a central axis of the male screw. In the radial direction of the male screw toward a predetermined cycle Forming the valley angle of the screw groove, and then bringing the first rotary tool into contact with the flank surface on the top side of the thread, and rotating the first rotary tool, The first rotary tool is relatively moved in a spiral at the lead angle of the male screw to cut the side surface of the base material, and the side surface is spirally formed with a constant radius at the lead angle of the male screw. Forming a thread groove by the thread, forming a bottom side flank surface on the valley bottom side of the thread groove and a top side flank surface on the top side of the thread in a discontinuous surface; It is a manufacturing method of the locking screw which forms the flank boundary line which is a boundary in the wavelike form along the flank in the cycle.
　また、前記製造方法により製造した緩み止めネジをマスターにして、他の部材に前記ネジ溝の形状を転写し、前記転写された部材の表面形状を他の円柱状の基材に転写して前記雄ネジを転造する緩み止めネジの製造方法である。 In addition, the locking screw manufactured by the manufacturing method is used as a master, the shape of the screw groove is transferred to another member, and the surface shape of the transferred member is transferred to another cylindrical base material to transfer It is a manufacturing method of the locking screw which rolls an external thread.
　さらに、前記製造方法により製造した緩み止めネジを第１のマスターにして、第１の平板状の部材に前記ネジ溝の形状を転写し、前記転写された部材の表面形状を、第２のマスターとなる他の円柱状の基材に転写して、前記雄ネジを前記第２のマスターに形成し、前記第２のマスターの前記ネジ溝を第２の平板状の部材に転写し、前記第２の平板状の部材から前記雄ネジを有するボルトを転造するものである。 Furthermore, the locking screw manufactured by the manufacturing method is used as a first master, and the shape of the screw groove is transferred to the first flat member, and the surface shape of the transferred member is the second master. And transfer the external thread to the second master, transfer the screw groove of the second master to a second flat member, and The bolt having the male screw is rolled from a flat plate member of 2.
　雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法であって、製造する前記雄ネジのネジ山の互いに対面するフランク面の成す角度のネジ溝を、平板状の部材に直接形成し、その際、前記ネジ溝のリード角を、平均リード角に対して前記一定の周期で変化した波状に形成し、この後、前記平板状の部材の前記ネジ溝に、前記雄ネジを形成する円柱状の基材の側面を圧接して、前記基材の側面に前記雄ネジを転造する緩み止めネジの製造方法である。 A manufacturing method of a locking screw used for fixing a fixed member by an external screw and an internal screw, wherein a screw groove having an angle formed by facing flanks of threads of the external screw to be manufactured is a flat plate In this case, the lead angle of the screw groove is formed in a wave shape which is changed at the fixed cycle with respect to the average lead angle, and then the screw groove of the flat member is removed. It is a manufacturing method of the locking screw which pressure-fits the side of a cylindrical base material which forms an external thread, and rolls the external thread on the side of the base.
　この発明の緩み止めネジとその製造方法によれば、簡単な構造で、特別の部品を用いることなく、ネジの緩み止め機能を効果的に確実に発揮させることができ、製造が容易で量産も可能であり、コストも安価なものである。 According to the locking screw of the present invention and the method of manufacturing the same, the screw locking function can be effectively and reliably exhibited with a simple structure and without using special parts, and it is easy to manufacture and mass-produce. It is possible and inexpensive.
この発明の一実施形態の緩み止めネジのボルトとナットにより被固定部材を固定した状態を示す部分破断側面図である。It is a partially broken side view which shows the state which fixed the to-be-fixed member by the volt | bolt and nut of the locking screw of one Embodiment of this invention. この実施形態の緩み止めネジであるボルトの雄ネジの側面の展開図である。It is an expanded view of the side of the external thread of the bolt which is a locking screw of this embodiment. この実施形態の緩み止めネジのリードを説明する展開図である。It is an expanded view explaining the lead of the locking screw of this embodiment. この実施形態の緩み止めネジのネジ山の部分拡大平面図（ａ）と、Ａ－Ａ断面図（ｂ）である。They are a partial enlarged plan view (a) of a thread of a locking screw of this embodiment, and an AA sectional view (b). 図４のＢ－Ｂ断面図である。FIG. 5 is a cross-sectional view taken along the line BB in FIG. 4; 図４のＣ－Ｃ断面図である。FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4; 図４のＤ－Ｄ断面図である。FIG. 5 is a cross-sectional view taken along a line DD in FIG. この実施形態の緩み止めネジの製造方法の工程を示す模式図である。It is a schematic diagram which shows the process of the manufacturing method of the locking screw of this embodiment. この実施形態の緩み止めネジの製造方法の他の工程を示す模式図である。It is a schematic diagram which shows the other process of the manufacturing method of the locking screw of this embodiment. この実施形態の緩み止めネジをネジの谷底に沿って切断した断面を示す断面図である。FIG. 6 is a cross-sectional view showing a cross section of the locking screw of this embodiment taken along the bottom of the screw; この実施形態の緩み止めネジのボルトとナットの螺合状態を示す部分断面図である。It is a fragmentary sectional view showing the screwing state of the bolt of a locking screw of this embodiment, and a nut. この実施形態の緩み止めネジのボルトとナットの他の位置での螺合状態を示す部分断面図である。It is a fragmentary sectional view showing the screwing state in other positions of the bolt of a locking screw of this embodiment, and a nut.
　以下、この発明の緩み止めネジの一実施形態について図面に基づいて説明する。この実施形態の緩み止めネジは、ボルト１０に形成された雄ネジ１２である。ボルト１０は、図１に示すように、通常のボルトと同様に、ナット１４とボルト１０の頭部１１により被固定部材１６を挟持して固定するものである。 Hereinafter, one embodiment of a locking screw of the present invention will be described based on the drawings. The locking screw of this embodiment is an external thread 12 formed on a bolt 10. As shown in FIG. 1, the bolt 10 holds and fixes the fixing member 16 between the nut 14 and the head portion 11 of the bolt 10 in the same manner as a normal bolt.
　雄ネジ１２は、ボルト１０の１回転で軸方向にリードＬだけ進むもので、図１、図３（ａ）に示すように、外径Ｄのボルト１０の雄ネジ１２の軸方向と直交する面に対する、雄ネジ１２のつる巻線１２ａの傾斜角度がリード角αとなる。この実施形態の雄ネジ１２は、図１、図３（ｂ）に示すように、ネジ山１８が一定の周期で軸方向に波状に形成されているもので、この波状のネジ山１８の波は、サインカーブ等の連続した周期的な波状の曲線で形成されている。ネジ山１８の波の周期は、雄ネジ１２の１周３６０°に対して９０°であり、雄ネジ１２の周面を１周する間に４周期で波長Ｗの波形状にネジ山１８が形成されている。 The male screw 12 advances in the axial direction only by the lead L in one rotation of the bolt 10, and is orthogonal to the axial direction of the male screw 12 of the bolt 10 of the outer diameter D as shown in FIGS. The inclination angle of the spiral winding 12a of the male screw 12 with respect to the surface is the lead angle α. In the male screw 12 of this embodiment, as shown in FIG. 1 and FIG. 3 (b), the thread 18 is formed in a wave shape in the axial direction at a constant cycle, and the wave of the wave thread 18 is formed. Is formed of a continuous periodic wavy curve such as a sine curve. The wave period of the thread 18 is 90 ° with respect to 360 ° of one rotation of the male screw 12, and the screw 18 has a wave shape of the wavelength W in four cycles during one round of the circumferential surface of the male screw 12. It is formed.
　波状のネジ山１８の１周期の間のリード角α（＞０）は、図３（ｂ）に示すように、この雄ネジ１２の平均リード角αave（＞０）に対して最大変化量±β（β＞０）のリード角の変化を与えるもので、最小リード角αmin＝αave－βの値は、０°よりわずかにマイナス側の値を示す程度であり、波状の雄ネジ１２の最大リード角αmax＝αave＋βは、平均リード角αaveの２倍よりも僅かに大きい程度の角度に設定されている。従って、平均リード角αave≒最大変化量βが好ましく、より好ましくはαave≒βであってα＜βであると良い。 The lead angle α (> 0) during one cycle of the undulating thread 18 is, as shown in FIG. 3 (b), maximum variation ± with respect to the average lead angle αave (> 0) of the male screw 12 The change of the lead angle of β (β> 0) is given, and the value of the minimum lead angle αmin = αave-β is a value showing a value slightly minus 0 ° from 0 °, and the maximum value of the wavy male screw 12 The lead angle αmax = αave + β is set to an angle slightly larger than twice the average lead angle αave. Therefore, the average lead angle αave リ ー ド maximum change amount β is preferable, and more preferably αave ≒ β and α <β.
　この実施形態のボルト１０を用いて、図１に示すように、通常ネジのナット１４とともに被固定部材１６を固定すると、ナット１４は、雄ネジ１２の波状のネジ山１８により、１周３６０°の間に周期的に強く圧接し変形する箇所が現れる。この実施形態ではネジ山１８の波の１波長Ｗが周期９０°であるので、この圧接部分は、雄ネジ１２とナット１４の互いに螺合している箇所の周面３６０°の間に４つの波が形成されている。従って、ネジの進行方向にプラスとマイナス方向で、８カ所の圧接部分が形成される。 When the fixing member 16 is fixed together with the nut 14 of the normal screw as shown in FIG. 1 using the bolt 10 of this embodiment, the nut 14 is 360.degree. There appears a location where pressure contact and deformation occur periodically in the interval between In this embodiment, since one wavelength W of the wave of the screw thread 18 has a period of 90 °, this pressure-contacting portion is formed between the circumferential surfaces 360 ° of the threaded portion of the male screw 12 and the nut 14. Waves are formed. Therefore, eight pressure contact parts are formed in the plus and minus directions in the screw advancing direction.
　ボルト１２の雄ネジ１２とナット１４は、締め付けによる荷重が働かない状態では、波状の周面のうちリード角が最大となる部分とリード角が最小となる部分で、雄ネジ１２のネジ山１８から強く押圧力が作用し、雄ネジ１２とナット１４の各々のネジ山１８が互いに変位を生じて弾性変形して圧接する。また、波状に変化するリード角αの平均リード角αaveと等しい中央部のネジ山１８部分では、通常のネジと同様接触状態となる。締め付けにより、ボルト１０及びナット１４の軸方向に荷重が作用すると、その荷重方向及びその反対方向に雄ネジ１２のネジ山１８とナット１４に力が作用する。これにより、雄ネジ１２は、波状のリード角のまま荷重方向にネジ山１８が変形し、波の頂点の４箇所で雄ネジ１２とナット１４が互いに強く圧接し、強固に固定される。 The external thread 12 and the nut 14 of the bolt 12 are screw threads 18 of the external thread 12 at a portion where the lead angle is the largest and a portion where the lead angle is the smallest on the waved circumferential surface in a state where no load is exerted by tightening. Thus, the pressure is exerted strongly, and the threads 18 of each of the male screw 12 and the nut 14 are displaced relative to each other to be elastically deformed and pressure-welded. In addition, in the central thread 18 portion equal to the average lead angle αave of the lead angle α which changes in a wavelike manner, the same contact state as the normal screw is achieved. When a load is applied in the axial direction of the bolt 10 and the nut 14 by tightening, a force acts on the thread 18 and the nut 14 of the male screw 12 in the load direction and the opposite direction. As a result, the screw thread 18 is deformed in the load direction with the undulating lead angle, and the male screw 12 and the nut 14 are strongly pressed against each other at the four points of the wave apex and firmly fixed.
　さらに、この実施形態のボルト１０は、図４～図７に示すように、ネジ山１８の螺旋方向Ｙに対して、ネジ溝２０の谷底の谷線２１が、雄ネジ１２の断面の半径方向に一定の周期の波長ｍで、ネジ山方向に振幅を有する波状に形成されている。また、雄ネジ１２のネジ山１８のフランク面２２は、ネジ溝２０の谷底の谷線２１で、互いに隣接する底側フランク面２２ａの成す谷角γの角度の値と、ネジ山１８の頂部１８ａ付近において、ネジ溝２０で互いに対面する頂部側フランク面２２ｂの成すネジ先角δの角度の値が異なるものである。ネジ先角δの角度が、谷角γの角度より僅かに大きく、この値の差は、０°より大きく１０°以下である。ネジ溝２０のフランク面２２の成す標準の角度をθとすると、底側フランク面２２ａの成す谷角γの値は、θ－Δθ（例えばΔθ＝５°）であり、ネジ先角δの値はθ＋Δθである。Δθの値は、最大で１０°、好ましくは１°～５°であり、ネジの用途により適宜設定する。 Furthermore, as shown in FIGS. 4 to 7, in the bolt 10 of this embodiment, the valley line 21 of the valley bottom of the thread groove 20 is in the radial direction of the cross section of the male screw 12 with respect to the spiral direction Y of the thread 18. , And has a wave form with a constant cycle wavelength m and an amplitude in the thread direction. Further, the flanks 22 of the thread 18 of the male screw 12 are valley lines 21 at the bottom of the thread groove 20, and the value of the angle of the valley angle γ formed by the adjacent bottom flanks 22a and the top of the thread 18 In the vicinity of 18a, the values of the angle of the screw tip angle δ formed by the top flanks 22b facing each other in the screw groove 20 are different. The angle of the screw tip angle δ is slightly larger than the angle of the valley angle γ, and the difference between the values is more than 0 ° and not more than 10 °. Assuming that the standard angle formed by the flanks 22 of the thread groove 20 is θ, the value of the valley angle γ formed by the bottom side flank 22a is θ−Δθ (eg, Δθ = 5 °), and the value of the screw tip angle δ Is θ + Δθ. The value of Δθ is at most 10 °, preferably 1 ° to 5 °, and is appropriately set according to the application of the screw.
　ネジ山１８のフランク面２２は、ネジ溝２０の谷線２１側の面である底側フランク面２２ａと、ネジ山１８の頂部１８ａ側の面である頂部側フランク面２２ｂとは互いに不連続である。従って、不連続な底側フランク面２２ａと頂部側フランク面２２ｂの境界には、フランク境界線２４が形成されている。頂部側フランク面２２ｂの螺旋方向Ｙに沿った断面の端縁は、螺旋方向Ｙに沿って展開すると、直線状に形成されている。即ち、フランク境界線２４の頂部１８ａ側の頂点ｃを結ぶ螺旋方向Ｙの断面の端縁は、図６に示すように、直線状に形成されている。一方、フランク境界線２４の谷線２１側の頂点ｄを結ぶ螺旋方向Ｙの断面の端縁は、図７に示すように、波長ｍで周期的に凹凸を繰り返す曲線になる。そして、フランク境界線２４は、一定の周期の波長ｍで、螺旋方向Ｙに沿って上下方向に波を描くようにネジ山１８のフランク面２２に形成されている。 The flanks 22 of the thread 18 are discontinuous from the bottom flank 22a, which is the surface on the valley line 21 side of the thread groove 20, and the top flank 22b, which is the surface on the top 18a of the thread 18. is there. Therefore, a flank boundary 24 is formed at the boundary between the discontinuous bottom flank 22a and the top flank 22b. The edge of the cross section of the top flank 22b along the spiral direction Y is formed in a straight line when developed along the spiral direction Y. That is, as shown in FIG. 6, the end of the cross section in the spiral direction Y connecting the apex c on the top 18a side of the flank boundary 24 is formed in a straight line. On the other hand, as shown in FIG. 7, the end of the cross section in the spiral direction Y connecting the vertex d on the valley line 21 side of the flank boundary line 24 becomes a curve that repeats unevenness periodically at the wavelength m. The flank boundary line 24 is formed on the flank surface 22 of the thread 18 so as to draw a wave in the vertical direction along the spiral direction Y at a wavelength m of a fixed cycle.
　雄ネジ１２のネジ山１８は、谷底の深さが前記周期の波長ｍで、フランク境界線２４の波形と同一の位相で変化するもので、谷線２１の波のネジ山１８の高さ方向の振れ幅ｈは、図５に示すように、波長ｍと比較して極めて僅かである。 The thread 18 of the male screw 12 is such that the depth of the valley bottom changes at the wavelength m of the period with the same phase as the waveform of the flank boundary line 24 and the height direction of the thread 18 of the wave of the valley line 21 The amplitude h of the light is very small compared to the wavelength m, as shown in FIG.
　また、図４に示すように、ネジ溝２０で互いに対向するフランク境界線２４は、谷底の谷線２１を中心に対称に形成されている。ネジ山１８の頂部１８ａを挟んで両側に位置するフランク境界線２４の波形状は、頂部１８ａを中心に対称に形成されている。なお、ネジ山１８の頂部１８ａを挟んで両側に位置するフランク境界線２４の波形状は、対称ではなく、波形状の位相が異なるように形成されているものでも良い。 Further, as shown in FIG. 4, the flank boundaries 24 opposed to each other in the screw groove 20 are formed symmetrically about the valley line 21 of the valley bottom. The wave shapes of the flank boundaries 24 located on both sides of the top 18 a of the thread 18 are formed symmetrically about the top 18 a. The wave shapes of the flank boundaries 24 located on both sides of the top 18 a of the screw thread 18 may not be symmetrical, and the phases of the wave shapes may be different.
　フランク境界線２４は、雄ネジ１２の１ピッチのリード中で、波長ｍの複数の波が形成され、この実施形態では、波長ｍは、雄ネジ１２の螺旋方向Ｙの波の波長Ｗに対して、１／４の波長で形成されている。従って、雄ネジ１２の１ピッチのリード中で、波長ｍの波が１６個形成されることになる。 The flank boundary line 24 forms a plurality of waves of wavelength m in the lead of one pitch of the male screw 12. In this embodiment, the wavelength m corresponds to the wavelength W of the wave in the spiral direction Y of the male screw 12. , And is formed at a wavelength of 1/4. Therefore, in the lead of one pitch of the male screw 12, 16 waves of wavelength m are formed.
　次に、この実施形態の緩み止めネジの雄ネジ１２の製造方法について、図８～図１０を基にして説明する。先ず、図８に示すように、雄ネジ１２を形成する円柱状のネジ用金属材料の基材２６の側面に、先端の角度が、製造する雄ネジ１２のネジ山１８の頂部１８ａ付近において、ネジ溝２０で互いに対面する頂部側フランク面２２ｂが成すネジ先角δの角度と等しい頂角の円錐状の第一の回転工具３０を当接させ、第一の回転工具３０を回転させて、雄ネジ１２のリード角αで螺旋状に基材２６に対して、第一の回転工具３０を相対的に円周上に沿って一定の半径で移動させ、基材２６の側面を切削する。そして、基材２６の側面３２にネジ溝２０の深さで、雄ネジ１２のリード角αで螺旋状にネジ溝２０を形成する。 Next, a method of manufacturing the male screw 12 of the locking screw of this embodiment will be described based on FIGS. 8 to 10. First, as shown in FIG. 8, on the side surface of the base material 26 of the cylindrical screw metal material forming the male screw 12, the tip angle is in the vicinity of the top 18 a of the thread 18 of the male screw 12 to be manufactured A conical first rotary tool 30 having an apex angle equal to the angle of the screw tip angle δ formed by the top flanks 22b facing each other in the screw groove 20 is abutted, and the first rotary tool 30 is rotated, The first rotary tool 30 is moved relative to the base 26 in a helical manner at a lead angle α of the male screw 12 and at a constant radius along the circumference, and the side of the base 26 is cut. Then, the screw groove 20 is formed in a spiral shape at the lead angle α of the male screw 12 at the depth of the screw groove 20 on the side surface 32 of the base 26.
　この後、ネジ先角δよりも小さい谷角γの頂角である円錐状の第二の回転工具３４を、ネジ溝２０の谷底に当接させ、第二の回転工具３４でネジ溝２０に沿って、雄ネジ１２のリード角αで螺旋状に相対的に移動させて、ネジ溝２０の谷底を切削する。このとき第二の回転工具３４を、雄ネジ１２の中心軸に向かって雄ネジ１２の半径方向に所定の周期で往復動させる。これにより、ネジ溝２０のネジ先角δの角度よりも小さい角度で、ネジ溝２０の谷底側に谷角γの溝が形成される。 After that, the conical second rotary tool 34, which is the apex angle of the valley angle γ smaller than the screw tip angle δ, is brought into contact with the valley bottom of the screw groove 20, and the second rotary tool 34 The valley bottom of the thread groove 20 is cut along a relatively spiral movement at a lead angle α of the male screw 12. At this time, the second rotary tool 34 is reciprocated in the radial direction of the male screw 12 toward the central axis of the male screw 12 in a predetermined cycle. Thereby, a groove having a valley angle γ is formed on the bottom side of the screw groove 20 at an angle smaller than the angle of the screw tip angle δ of the screw groove 20.
　以上の工程により、ネジ溝２０の谷底側の底側フランク面２２ａと、ネジ山１８の頂部１８ａ側の頂部側フランク面２２ｂは、不連続な面に形成され、不連続な面の境界であるフランク境界線２４が、波長ｍの一定の周期でフランク面２２に沿って、螺旋方向Ｙに形成される。 By the above-described steps, the bottom side flank surface 22a on the valley bottom side of the screw groove 20 and the top side flank surface 22b on the top 18a side of the thread 18 are formed as discontinuous surfaces and are boundaries of the discontinuous surfaces. A flank boundary 24 is formed in the helical direction Y along the flank 22 at a constant period of wavelength m.
　なお、第一の回転工具３０でボルト１０の基材２６にネジ溝２０を形成する際に、雄ネジ１２のリード角αを、平均リード角αave（＞０）に対して最大変化量±βで波長Ｗの波状に、第一の回転工具３０を雄ネジ１２の長手方向中心軸の方向に変化させながら形成しても良い。このとき、第二の回転工具３４による谷角γの形成時も、リード角αを波長Ｗで、最大変化量±βで変化させて形成する。これにより、雄ネジ１２のリード角αが±β、波長Ｗで変化する波形状にネジ山１８を形成するとともに、ネジ溝２０のフランク面２２が、ネジ山１８の高さ方向、即ちネジ溝２０の深さ方向に、波長ｍで周期的に変化する雄ネジ１２を形成することができる。また、用途によっては、第一の回転工具３０でボルト１０の基材２６にネジ溝２０を形成した状態で、フランク面２２にフランク境界線２４を形成せずに、波状のリード角を有したボルトとして用いても良い。 In addition, when forming the thread groove 20 in the base material 26 of the bolt 10 with the first rotary tool 30, the lead angle α of the male screw 12 is maximum variation ± β with respect to the average lead angle αave (> 0). The first rotary tool 30 may be formed in a wave shape of the wavelength W while changing in the direction of the longitudinal central axis of the male screw 12. At this time, also when the valley angle γ is formed by the second rotary tool 34, the lead angle α is changed at the wavelength W by the maximum change amount ± β. As a result, the screw thread 18 is formed in a wave shape in which the lead angle α of the male screw 12 changes by ± β and the wavelength W, and the flank surface 22 of the screw groove 20 is in the height direction of the screw thread 18, In the depth direction of 20, it is possible to form an external thread 12 that changes periodically at wavelength m. Also, in some applications, with the first rotary tool 30 forming the thread groove 20 in the base material 26 of the bolt 10, the flank surface 22 has a wave-like lead angle without forming the flank boundary line 24. It may be used as a bolt.
　また、上記の工程において、先ず第二の回転工具３４を用いて、ボルト１０の基材２６に雄ネジ１２のリード角αで螺旋状に相対的に移動させて、ボルト１０の基材２６にネジ溝２０を先に形成しても良い。このとき、雄ネジ１２の中心軸に向かって雄ネジ１２の半径方向に、第二の回転工具３４を所定の周期で往復動させることにより、ネジ溝２０の深さ方向に所定の周期の波形で谷線２１を形成し、谷角γの溝を形成する。この後、第一の回転工具３０で、雄ネジ１２のネジ溝２０に、リード角αで螺旋状に相対的に移動させて、頂部側フランク面２２ｂのみをネジ先角δで形成しても良い。このときも、先に第二の回転工具３４で谷角γの溝を波状の谷線２１を形成しているので、フランク面２２に波状のフランク境界線２４が形成される。さらに、リード角αが±β、波長Ｗで変化する波形状にネジ山１８を形成しても良く、用途によっては、第二の回転工具３４でボルト１０の基材２６にネジ溝２０を形成した状態で、フランク面２２にフランク境界線２４を形成せずに、波状のリード角を有したボルトとして用いても良い。 In the above process, first, using the second rotary tool 34, the base 26 of the bolt 10 is moved relative to the base 26 of the bolt 10 in a spiral relative to the lead angle α of the male screw 12. The screw groove 20 may be formed first. At this time, by reciprocating the second rotary tool 34 at a predetermined cycle in the radial direction of the male screw 12 toward the central axis of the male screw 12, a waveform of a predetermined cycle in the depth direction of the screw groove 20 Form the valley line 21 and form a groove with a valley angle γ. After that, the first rotary tool 30 moves the spiral groove relatively at the lead angle α in the screw groove 20 of the male screw 12 to form only the top side flank surface 22 b with the screw tip angle δ good. Also at this time, since the groove of the valley angle γ is formed in the wave-like valley line 21 first by the second rotary tool 34, the wave-like flank boundary 24 is formed on the flank surface 22. Furthermore, the screw thread 18 may be formed in a wave shape in which the lead angle α changes by ± β and the wavelength W, and depending on the application, the screw groove 20 is formed in the base 26 of the bolt 10 with the second rotary tool 34 In this state, the flank surface 22 may be used as a bolt having a wavy lead angle without forming the flank boundary line 24.
　この実施形態のボルト１０は、ネジ山１８の底側フランク面２２ａと頂部側フランク面２２ｂが不連続な面に形成され、不連続な面の境界のフランク境界線２４が、波長ｍの波状に形成され、ナット１４が螺合した状態で、図１１、図１２に示すように、ナット１４のネジ山３８にフランク境界線２４が他の部分より強く圧接する。即ち、フランク境界線２４が圧接しているナット１４のネジ山３８が、最大圧接力がかかっている位置である。この最大圧接力が作用する位置は、波長ｍで周期的にネジ山３８の高さ方向に波状に変化し、ボルト１０とナット１４が螺合している。 In the bolt 10 of this embodiment, the bottom flank 22a and the top flank 22b of the thread 18 are formed in a discontinuous surface, and the flank boundary 24 of the boundary of the discontinuous surface has a wave shape of wavelength m. In the state where the nut 14 is formed and screwed, as shown in FIGS. 11 and 12, the flank boundary line 24 is more strongly in pressure contact with the thread 38 of the nut 14 than the other portions. That is, the thread 38 of the nut 14 with which the flank boundary line 24 is in pressure contact is the position where the maximum pressure contact force is applied. The position at which the maximum pressure contact force acts changes periodically in the height direction of the screw thread 38 at the wavelength m, and the bolt 10 and the nut 14 are screwed together.
　このときのボルト１０の雄ネジ１２のネジ山１８にかかる力のつり合いは、境界のフランク境界線２４に接する方向の力と直角な方向の力に分けることができる。この状態で、ボルト１０の軸方向の直角方向の力が作用しても、ボルト１０とナット１４のネジ同士の圧接力は、全体として緩みにくく、圧接状態を確実に維持することができる。 At this time, the balance of the force applied to the thread 18 of the external thread 12 of the bolt 10 can be divided into the force in the direction perpendicular to the force in the direction of contacting the flank boundary line 24 of the boundary. In this state, even if a force in the direction perpendicular to the axial direction of the bolt 10 acts, the pressure contact force between the bolt 10 and the screw of the nut 14 as a whole is less likely to loosen and the pressure contact state can be reliably maintained.
　次に、この実施形態の雄ネジ１２を量産する方法について説明する。先ず、上記製造方法により、通常のボルトよりも硬い金属の円柱状の基材にマスターとなる雄ネジ１２を形成する。次に、マスターの雄ネジ１２を、ボルト１０を量産するために用いる図示しない平板状のダイプレートに転写する。そして、このダイプレートを用いて、量産用のボルトの側面に上記実施形態の波状のネジ山１８を転造する。 Next, a method of mass-producing the male screw 12 of this embodiment will be described. First, according to the above manufacturing method, the male screw 12 as a master is formed on a cylindrical base material of metal harder than a normal bolt. Next, the master male screw 12 is transferred to a flat die plate (not shown) used for mass production of the bolt 10. Then, using the die plate, the wavelike screw thread 18 of the above embodiment is rolled on the side surface of the bolt for mass production.
　また、上記製造方法により製造した緩み止めネジの雄ネジを第１のマスターにして、第１の平板状の部材にネジ溝の形状を転写し、転写された部材の表面形状を、第２のマスターとなる円柱状の基材に転写して、雄ネジ１２を第２のマスターに形成し、第２のマスターのネジ溝を第２の平板状の部材に転写し、この第２の平板状の部材を用いて、量産品であるボルト１０を転造するものでも良い。 Further, the male screw of the locking screw manufactured by the above manufacturing method is used as a first master, and the shape of the screw groove is transferred to the first flat plate member, and the surface shape of the transferred member is a second shape. Transfer to a cylindrical base material to be a master, form the male screw 12 on the second master, transfer the screw groove of the second master to the second flat plate member, and this second flat plate shape The component 10 may be used to roll a bolt 10 which is a mass-produced product.
　その他、平板状のダイプレートに直接、放電加工や切削加工等により前記ネジ山による前記ネジ溝を形成して、これを基にマスターとなる雄ネジ１２を転造により形成しても良く、そのまま量産用のボルトを転造しても良い。 In addition, the screw groove may be formed by the screw thread directly on the flat die plate by electric discharge machining, cutting, etc., and the male screw 12 as a master may be formed by rolling based on this, as it is You may roll a bolt for mass production.
　この実施形態の緩み止めネジのボルト１０は、雄ネジ１２のネジ山１８のフランク面２２に、フランク角が僅かに異なって不連続な面である底側フランク面２２ａと頂部側フランク面２２ｂ形成され、その境界に波状のフランク境界線２４が形成されている。さらにリード角αが一定の周期の波長Ｗで変化するように形成することにより、図１１、図１２に示すように、ボルト１０とナット１４が螺合した状態で、互いのネジ山１８，３８が部分的に異なる力が作用し、弾性変形して圧接する。さらに、ナット１４を締めることによって、周期的により強くナット１４のネジ山３８にボルト１０のネジ山１８が圧接し、ネジ山１８を弾性変形させる。これにより、外部からの振動等が作用しても、緩み方向の力に対して、ネジ山１８，３８の圧接面に作用する力により、緩みを確実に防止する。しかも、ここで用いるナット１４は、通常ネジのナットでよく、特殊な構造のナットを用いる必要がないので、コストも安価に抑えることができる。 In this embodiment, the bolt 10 of the locking screw is formed on the flanks 22 of the thread 18 of the external thread 12 so as to form a bottom flank 22a and a top flank 22b, which are discontinuous faces with slightly different flank angles. The wavelike flank boundary 24 is formed at the boundary. Further, by forming the lead angle α so as to change at the wavelength W of a constant cycle, as shown in FIGS. 11 and 12, in the state where the bolt 10 and the nut 14 are screwed together, each other's threads 18, 38 There are partially different forces acting, causing elastic deformation and pressure welding. Furthermore, by tightening the nut 14, the thread 18 of the bolt 10 is pressed against the thread 38 of the nut 14 more strongly periodically, and the thread 18 is elastically deformed. As a result, even if vibration or the like from the outside acts, the force acting on the pressure contact surfaces of the screw threads 18, 38 against the force in the loosening direction reliably prevents the looseness. Moreover, since the nut 14 used here may be a screw nut in general, and there is no need to use a nut of a special structure, the cost can be reduced at low cost.
　なお、ネジ山１８に形成される波の波長は、上記実施形態以外に適宜設定することができる。例えば、波長ｍの波と波長Ｗの波の周期は、２２．５°と９０°以外に、ネジの１周における波数が３の倍数になる場合でも良い。さらに、最大リード角や最小リード角の値は、そのネジの用途や性能に合わせて適宜設定すれば良いものであり、ネジも１条ネジの他、多条ネジに応用しても良いものである。 In addition, the wavelength of the wave formed in the screw thread 18 can be suitably set other than the said embodiment. For example, the wave periods of the wave of wavelength m and the wave of wavelength W may be multiples of 3 in one round of the screw other than 22.5 ° and 90 °. Further, the values of the maximum lead angle and the minimum lead angle may be appropriately set according to the application and performance of the screw, and the screw may be applied to a multi-threaded screw other than a single-threaded screw. is there.
１０　ボルト
１２　雄ネジ
１４　ナット
１６　被固定部材
１８，３８　ネジ山
１８ａ　頂部
２０　ネジ溝
２１　谷線
２２　フランク面
２２ａ　底側フランク面
２２ｂ　頂部側フランク面
２４　フランク境界線 Reference Signs List 10 bolt 12 male thread 14 nut 16 fixed member 18, 38 thread 18a top 20 thread groove 21 valley line 22 flank surface 22a bottom side flank surface 22b top side flank surface 24 flank boundary line

Claims (14)

  1. 　雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジにおいて、
    　前記雄ネジのネジ山のフランク面は、前記ネジ山間のネジ溝の谷底側で互いに隣接する前記フランク面が成す角度である谷角の角度と、前記ネジ山の頂部側において前記ネジ溝で互いに対面する前記フランク面の成す角度であるネジ先角の角度が異なり、前記ネジ先角の角度が前記谷角の角度より大きく、
    　前記ネジ山のフランク面は、前記ネジ溝の谷底側の面である底側フランク面と、前記ネジ山の頂部側の面である頂部側フランク面が不連続に形成され、不連続な前記底側フランク面と前記頂部側フランク面の境界であるフランク境界線が、所定の周期で前記フランク面に波状に形成されていることを特徴とする緩み止めネジ。     In a locking screw used to fix a fixed member by an external thread and an internal thread,
    The flank surface of the thread of the external thread is an angle of a valley angle which is an angle formed by the flanks adjacent to each other on the valley bottom side of the thread groove between the threads, and the thread groove on the top side of the thread The angle of the screw tip angle which is an angle formed by the facing flanks is different, and the angle of the screw tip angle is larger than the angle of the valley angle,
    The flank surface of the thread has a bottom flank surface which is a surface on the valley bottom side of the thread groove and a top flank surface which is a surface on the top side of the thread groove formed discontinuously. A locking screw characterized in that a flank boundary line that is a boundary between a side flank surface and the top side flank surface is formed in the flank surface in a wavelike manner at a predetermined cycle.
  2. 　前記雄ネジの前記ネジ山は、前記谷底の深さが前記フランク境界線の前記周期で、同位相で変化する請求項１記載の緩み止めネジ。 2. The locking screw according to claim 1, wherein the thread of the male thread changes in depth of the valley bottom in the same phase in the cycle of the flank boundary line.
  3. 　前記ネジ溝で互いに対向するフランク境界線は、前記谷底を中心に対称に形成されている請求項１又は２記載の緩み止めネジ。 The locking screw according to claim 1 or 2, wherein the flank boundary lines opposite to each other in the thread groove are formed symmetrically about the valley bottom.
  4. 　前記ネジ山の頂部を挟んで両側に位置する前記フランク境界線は、前記頂部を中心に対称に形成されている請求項３記載の緩み止めネジ。 The locking screw according to claim 3, wherein the flank boundary lines located on both sides of the top of the thread are formed symmetrically about the top.
  5. 　前記ネジ山の頂部を挟んで両側に位置する前記フランク境界線の波形状は、異なる同位相で形成されている請求項３記載の緩み止めネジ。 The locking screw according to claim 3, wherein the wave shapes of the flank boundaries located on both sides of the top of the thread are formed in different same phases.
  6. 　前記雄ネジのネジ山が、ネジの螺旋方向に対して波状に形成され、リード角が周期的に変化している請求項１又は２記載の緩み止めネジ。 The locking screw according to claim 1 or 2, wherein a thread of the male screw is formed in a wave shape with respect to a spiral direction of the screw, and a lead angle is periodically changed.
  7. 　前記フランク境界線は、前記雄ネジの１ピッチのリード中で、複数の波が形成されている請求項１又は２記載の緩み止めネジ。 The locking screw according to claim 1 or 2, wherein the flank boundary line has a plurality of waves formed in a lead of one pitch of the male screw.
  8. 　前記フランク境界線は、前記雄ネジの前記リード角の変化の１周期中に、複数の波が設けられている請求項６記載の緩み止めネジ。 The locking screw according to claim 6, wherein the flank boundary line is provided with a plurality of waves during one cycle of the change of the lead angle of the male screw.
  9. 　雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法において、
    　先端の角度が、製造する前記雄ネジのネジ溝の互いに対面するフランク面の成す角度と等しい頂角の円錐状の回転工具設け、
    　前記雄ネジを形成する円柱状の基材の側面に、前記回転工具を当接させ、前記回転工具を回転させて、前記雄ネジのリード角で一定の半径の螺旋状に、前記回転工具を相対的に移動させて前記基材の側面を切削し前記ネジ溝を形成し、その際、前記回転工具の位置を前記雄ネジの長手方向中心軸の方向に一定の周期で変化させ、前記リード角を、平均リード角に対して前記一定の周期で変化させて、前記一定の周期の波長の波状に前記ネジ溝を形成することを特徴とする緩み止めネジの製造方法。     In a method of manufacturing a locking screw used to fix a fixed member by an external thread and an internal thread,
    Providing a conical rotary tool with a top angle equal to the angle between the flanks of the flanks of the thread groove of the external thread to be manufactured,
    The rotary tool is brought into contact with the side surface of a cylindrical base material forming the male screw, and the rotary tool is rotated so that the rotary tool has a spiral shape with a constant radius at the lead angle of the male screw. The relative movement is performed to cut the side surface of the base material to form the screw groove, wherein the position of the rotary tool is changed in the direction of the longitudinal center axis of the male screw at a constant cycle, and the lead A method of manufacturing a locking screw characterized in that an angle is changed at the fixed cycle with respect to an average lead angle to form the screw groove in a wave shape of the fixed cycle wavelength.
  10. 　雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法において、
    　先端の角度が、製造する前記雄ネジのネジ山の頂部側において互いに対面するフランク面の成す角度であるネジ先角の角度と等しい頂角の円錐状の第一の回転工具と、前記ネジ山間のネジ溝の谷底の角度よりも小さい頂角を有する円錐状の第二の回転工具と設け、
    　前記雄ネジを形成する円柱状の基材の側面に、前記第一の回転工具を当接させ、前記第一の回転工具を回転させて、前記雄ネジのリード角で一定の半径の螺旋状に、前記第一の回転工具を相対的に移動させて、前記基材の側面を切削し、前記雄ネジのリード角で螺旋状に前記側面に前記ネジ溝を形成し、
    　この後、前記第二の回転工具を前記ネジ溝の谷底に当接させ、前記第二の回転工具で前記ネジ溝に沿って、前記雄ネジのリード角で螺旋状に相対的に移動させて前記ネジ溝の谷底を切削し、このとき前記第二の回転工具を、前記雄ネジの中心軸に向かって前記雄ネジの半径方向に所定の周期で往復させるとともに、前記雄ネジのリード角で螺旋状に移動させて、前記ネジ溝の前記ネジ先角の角度よりも小さい角度の、前記ネジ溝の谷底側の谷角を形成し、
    　前記ネジ溝の谷底側の底側フランク面と、前記ネジ山の頂部側の頂部側フランク面を不連続な面に形成し、前記不連続な面の境界であるフランク境界線を、前記周期で前記フランク面に沿って波状に形成することを特徴とする緩み止めネジの製造方法。     In a method of manufacturing a locking screw used to fix a fixed member by an external thread and an internal thread,
    A conical first rotary tool having an apex angle equal to an angle of a screw tip angle which is an angle formed by flanks facing each other on a top side of a thread of the external thread to be manufactured, and an angle between the threads And a conical second rotary tool having an apex angle smaller than the angle of the bottom of the thread groove of
    The first rotary tool is brought into contact with the side surface of a cylindrical base material forming the male screw, and the first rotary tool is rotated to form a spiral having a constant radius at a lead angle of the male screw. The first rotary tool is moved relatively to cut the side surface of the base material, and the thread groove is formed on the side surface in a spiral at a lead angle of the male screw;
    Thereafter, the second rotary tool is brought into contact with the valley bottom of the screw groove, and moved relatively along the screw groove by the second rotary tool at a lead angle of the male screw. The valley bottom of the thread groove is cut, and at this time, the second rotary tool is reciprocated in the radial direction of the male screw toward the central axis of the male screw in a predetermined cycle, and at the lead angle of the male screw The spiral groove is moved to form a valley angle on the valley bottom side of the screw groove, which is smaller than the angle of the screw tip angle of the screw groove,
    The bottom side flank on the valley bottom side of the screw groove and the top side flank on the top side of the thread are formed in a discontinuous plane, and the flank boundary line which is the boundary of the discontinuous plane is the above period. A method of manufacturing a locking screw characterized in that it is formed in a wave shape along the flank surface.
  11. 　雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法において、
    　先端の角度が、製造する前記雄ネジのネジ山の頂部側において互いに対面するフランク面の成す角度であるネジ先角の角度と等しい頂角の円錐状の第一の回転工具と、前記ネジ山間のネジ溝の谷底の角度よりも小さい頂角を有する円錐状の第二の回転工具と設け、
    　前記雄ネジを形成する円柱状の基材の側面に、前記第二の回転工具を当接させ、前記第二の回転工具を回転させて、前記雄ネジのリード角で一定の半径の螺旋状に、前記第二の回転工具を相対的に移動させて、前記基材の側面を切削し前記ネジ溝を形成し、このとき前記第二の回転工具を、前記雄ネジの中心軸に向かって前記雄ネジの半径方向に所定の周期で往復させて、前記ネジ溝の前記谷角を形成し、
    　この後、前記第一の回転工具を、前記ネジ山の頂部側の前記フランク面に当接させ、前記第一の回転工具を回転させて、前記雄ネジのリード角で螺旋状に、前記第一の回転工具を相対的に移動させて、前記基材の側面を切削し、前記雄ネジのリード角で一定の半径の螺旋状に前記側面に前記ネジ山によるネジ溝を形成し、
    　前記ネジ溝の谷底側の底側フランク面と、前記ネジ山の頂部側の頂部側フランク面を不連続な面に形成し、前記不連続な面の境界であるフランク境界線を、前記周期で前記フランク面に沿って波状に形成することを特徴とする緩み止めネジの製造方法。     In a method of manufacturing a locking screw used to fix a fixed member by an external thread and an internal thread,
    A conical first rotary tool having an apex angle equal to an angle of a screw tip angle which is an angle formed by flanks facing each other on a top side of a thread of the external thread to be manufactured, and an angle between the threads And a conical second rotary tool having an apex angle smaller than the angle of the bottom of the thread groove of
    The second rotary tool is brought into contact with the side surface of the cylindrical base material forming the male screw, and the second rotary tool is rotated to form a spiral having a constant radius at the lead angle of the male screw. And relatively moving the second rotary tool to cut the side surface of the base material to form the screw groove, wherein the second rotary tool is directed toward the central axis of the male screw. Reciprocating in a radial direction of the male screw in a predetermined cycle to form the valley angle of the screw groove,
    Thereafter, the first rotary tool is brought into contact with the flank on the top side of the screw thread, and the first rotary tool is rotated to spiral the lead screw at the lead angle of the male screw. One rotary tool is relatively moved to cut the side surface of the base material, and a thread groove formed by the thread is formed on the side surface in a spiral of a constant radius at a lead angle of the external thread;
    The bottom side flank on the valley bottom side of the screw groove and the top side flank on the top side of the thread are formed in a discontinuous plane, and the flank boundary line which is the boundary of the discontinuous plane is the above period. A method of manufacturing a locking screw characterized in that it is formed in a wave shape along the flank surface.
  12. 　前記製造方法により製造した緩み止めネジをマスターにして、他の部材に前記ネジ溝の形状を転写し、前記転写された部材の表面形状を他の円柱状の基材に転写して前記雄ネジを転造する請求項９，１０または１１記載の緩み止めネジの製造方法。 The locking screw manufactured by the manufacturing method is used as a master, the shape of the screw groove is transferred to another member, the surface shape of the transferred member is transferred to another cylindrical base material, and the male screw is formed. A method of manufacturing a locking screw according to claim 9, 10 or 11 in which
  13. 　前記製造方法により製造した緩み止めネジを第１のマスターにして、第１の平板状の部材に前記ネジ溝の形状を転写し、前記転写された部材の表面形状を、第２のマスターとなる他の円柱状の基材に転写して、前記雄ネジを前記第２のマスターに形成し、前記第２のマスターの前記ネジ溝を第２の平板状の部材に転写し、前記第２の平板状の部材から前記雄ネジを有するボルトを転造する請求項９，１０または１１記載の緩み止めネジの製造方法。 The locking screw manufactured by the manufacturing method is used as a first master, and the shape of the screw groove is transferred to a first flat plate-like member, and the surface shape of the transferred member becomes a second master. Transfer to another cylindrical base material to form the external thread on the second master, transfer the thread groove of the second master to a second flat member, and The method according to claim 9, 10 or 11, wherein the bolt having the male thread is rolled from a flat plate-like member.
  14. 　雄ネジと雌ネジにより被固定部材を固定するために用いる緩み止めネジの製造方法において、
    　製造する前記雄ネジのネジ山の互いに対面するフランク面の成す角度のネジ溝を、平板状の部材に直接形成し、その際、前記ネジ溝のリード角を、平均リード角に対して前記一定の周期で変化した波状に形成し、
    　この後、前記平板状の部材の前記ネジ溝に、前記雄ネジを形成する円柱状の基材の側面を圧接して、前記基材の側面に前記雄ネジを転造することを特徴とする緩み止めネジの製造方法。     In a method of manufacturing a locking screw used to fix a fixed member by an external thread and an internal thread,
    A screw groove having an angle formed by facing flanks of threads of the male screw to be manufactured is formed directly on a flat member, wherein a lead angle of the screw groove is constant with respect to an average lead angle. The wave form changes with the period of
    After that, the side surface of the cylindrical base material forming the external thread is pressed against the screw groove of the flat member, and the external thread is rolled on the side surface of the base material. How to make a locking screw.
PCT/JP2017/030883 2017-08-29 2017-08-29 Locking screw and method for manufacturing same WO2019043775A1 (en)

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