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WO2018158845A1 - Vis et son procédé de fabrication - Google Patents

Vis et son procédé de fabrication Download PDF

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Publication number
WO2018158845A1
WO2018158845A1 PCT/JP2017/007939 JP2017007939W WO2018158845A1 WO 2018158845 A1 WO2018158845 A1 WO 2018158845A1 JP 2017007939 W JP2017007939 W JP 2017007939W WO 2018158845 A1 WO2018158845 A1 WO 2018158845A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
diameter
annular groove
effective diameter
incomplete
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.)
Ceased
Application number
PCT/JP2017/007939
Other languages
English (en)
Japanese (ja)
Inventor
勇作 大森
正典 横田
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.)
Nittoseiko Co Ltd
Original Assignee
Nittoseiko Co Ltd
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 Nittoseiko Co Ltd filed Critical Nittoseiko Co Ltd
Priority to PCT/JP2017/007939 priority Critical patent/WO2018158845A1/fr
Priority to JP2019502336A priority patent/JP6872004B2/ja
Publication of WO2018158845A1 publication Critical patent/WO2018158845A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a screw that can be screwed in until it is in close contact with the workpiece surface, and a method for manufacturing the same.
  • a conventional screw includes a large-diameter head and a screw leg portion having a male screw adjacent to the head, and the male screw is a complete male screw portion having a complete chevron shape and the complete male screw portion. Is formed by an incomplete male thread portion that forms an incomplete chevron shape that is provided in a row and is gradually reduced in thread height.
  • the conventional screw includes a groove portion disposed below the neck of the head, and the diameter of the groove portion is set to be smaller than the root diameter of the complete male screw portion. Yes. Further, the groove portion is connected to a terminal end of the incomplete male screw portion.
  • the conventional screw thus configured is screwed into a workpiece having a female screw that can be screwed into the complete male screw portion and is tightened by a predetermined tightening torque. Since the diameter is smaller than the root diameter of the complete male thread portion, that is, the inner diameter of the female screw, even if the head is in close contact with the workpiece, it does not interfere with the female screw. Therefore, there is a feature that it can be screwed to the end without floating until the head comes into close contact with the workpiece surface.
  • a conventional method for manufacturing a screw includes a forging step of integrally forming the head and a rivet having a smaller diameter and a columnar shape than the head by pressing a wire set to a predetermined diameter, and the forging step A thread rolling process in which the spiral male thread is rolled on the outer periphery of the rivet formed by the above-described method, and the forging process or the thread thread by heating at a predetermined temperature after the thread rolling process or before the thread rolling process. And a heat treatment process for correcting distortion of a portion plastically deformed by the rolling process.
  • the diameters of the wire and the rivet are set so as to be approximately the same as the effective diameter of the male screw formed by the thread rolling process.
  • the conventional method for manufacturing a screw provided with the washer includes a washer assembling step for incorporating the washer into the rivet after the forging step, and the washer assembling step is set before the thread rolling step. ing.
  • the rivet having the effective diameter is supplied to a pair of reciprocating rolling tools, and the crest and the diameter are expanded from the effective diameter. Since the complete male thread portion to be a trough portion is formed, the deformation ratios of the diameter expansion and the diameter reduction are distributed in a well-balanced manner almost in half. Therefore, there is a feature that the life of the rolling tool is extended.
  • the conventional screw can be screwed in until it comes into close contact with the surface of the workpiece, it does not break from the valley diameter of the complete male thread portion due to the increase in torque and axial force generated after the head is seated.
  • the groove portion set to a diameter smaller than the valley diameter is easily broken and cannot be fastened by a high tightening torque.
  • the present invention provides a complete male thread portion (21) that forms a spiral complete thread thread on a material leg (6) that is set to have substantially the same diameter as the effective diameter ( ⁇ A) of the male thread, and this complete male thread portion.
  • the material leg portion (6) has the effective diameter ( ⁇ A)
  • an annular groove (6b) having a smaller diameter than the effective diameter shaft portion (6c)
  • the annular groove (6b) has the effective diameter ( ⁇ A) and a diameter larger than the root diameter ( ⁇ H) of the complete male thread portion (21), and the material leg portion (6) is rolled to form the complete male thread portion (21).
  • the incomplete male screw portion (22) is deformed from the effective diameter shaft portion (6c) of the material leg portion (6) into an annular groove (20).
  • 6b) is characterized by an incomplete thread shape that gradually decreases over time.
  • the material leg (6) includes a neck lower part (6a) connected to the annular groove (6b) and dimensioned to approximately the same diameter as the effective diameter shaft part (6c), and the neck lower part (6a).
  • a washer (40) inserted through the complete male screw portion (21).
  • the washer (40) preferably includes at least part of the annular groove (20b) of the screw leg (20).
  • the screw manufacturing method includes a wire rod having a diameter substantially the same as the effective diameter ( ⁇ A) of the male screw, a large diameter head (10), and a material leg having the same diameter as the effective diameter ( ⁇ A) ( 6) Forging step (P) for forging, and annular groove (6b) having a diameter smaller than the effective diameter ( ⁇ A) in the material leg (6) formed by this forging step (P).
  • a thread rolling process (Rb) for rolling and forming the incomplete male thread portion (22) to be formed.
  • the heat processing process (S) which heat-processes the said raw material (5) and raises surface hardness may be set before the said thread rolling process (Rb).
  • the washer assembling step (F) for incorporating a washer having a diameter larger than that of the head (10) into the material (5) is set after the heat treatment step (S).
  • the screw according to the present invention includes an annular groove portion having a diameter smaller than the effective diameter and larger than the valley diameter in the screw leg portion, it has a higher breaking torque than the conventional one and can be fastened with a higher tightening torque than before.
  • the screw according to the present invention is configured such that a washer that is freely fitted to a lower neck portion that is set to have substantially the same diameter as the effective diameter is retained by the complete male thread portion. There is also an advantage that the usage can be expanded.
  • the screw of the present invention since the screw of the present invention includes at least a part of the annular groove portion with the washer, the incomplete male screw portion can be disposed close to one end side of the washer. As a result, the screw of the present invention is not only widened in use as described above, but also has an advantage that an incomplete male screw portion that fits into the thread shape of the female screw and can be screwed can be formed.
  • the groove rolling process for rolling the annular groove is set before the thread rolling process for rolling the screw legs, the incomplete male thread Since the rolling tool for rolling the part contacts the annular groove having a diameter smaller than the effective diameter, there is an advantage that a large load is not applied to the end of the rolling tool and breakage such as chipping is difficult to occur.
  • the manufacturing method of the screw which concerns on this invention can reduce the load concerning the said rolling tool by rolling the raw material leg part provided with the small diameter annular groove with a rolling tool as mentioned above, strength is carried out by the said heat treatment process. Even when rolling a material leg portion with improved resistance, a large load is unlikely to occur at a site where the incomplete thread portion of the rolling tool is formed. Therefore, the screw manufacturing method according to the present invention has an advantage that the heat treatment process can be set as a pre-process of the thread rolling process, and the degree of freedom of design related to the manufacturing process can be increased.
  • the screw manufacturing method according to the present invention includes a washer assembling step for incorporating a washer into the material that has undergone the heat treatment step. No. Therefore, there is an advantage that the problem of strength reduction of the washer due to reheating can be solved, and optimum heat treatment conditions can be set by the temperature setting and the heating time corresponding to the material of the material.
  • the screw 1 of the present invention is composed of a large-diameter head 10 and a screw leg portion 20 having a smaller diameter than the head 10.
  • the screw leg portion 20 includes a screw portion 20c having a complete male screw portion 21 forming a complete screw thread shape and an incomplete male screw portion 22 forming an incomplete screw thread shape, and the complete male screw portion connected to the head portion 10.
  • the neck portion 6a is set to the effective diameter ⁇ A of the screw portion 21 and the annular groove portion 20b having a diameter smaller than the effective diameter ⁇ A and larger than the valley diameter ⁇ H of the complete male screw portion 21.
  • the dimensional relationship of the outer diameter ⁇ D of the complete male thread portion 21 is ⁇ M> ⁇ A> ⁇ D> ⁇ H. Yes.
  • the incomplete male screw portion 22 is connected to the annular groove portion 20b from the end of the complete male screw portion 21, and forms an incomplete screw thread shape. Further, the crest height is formed so as to gradually decrease in the radial direction from the effective diameter shaft portion 6c toward the annular groove 6b, and is formed on the extension of the complete male screw portion 21, and as shown in FIG. It is within the thread form.
  • the screw 1 according to the present invention is a female screw (not shown in FIG. 5; fixed side rotation described later in FIG. 5) that is pre-formed on the work and can be screwed into the complete male screw portion 21 in the process of being screwed into the work.
  • the complete male screw portion 21 and the incomplete male screw portion 22 do not interfere with the die making die 51 and the movable side rolling die 52 described later). Therefore, the screw 1 can be smoothly screwed in without deforming the screw portion 20c until the head portion 10 comes into close contact with the surface of the workpiece.
  • the screw 1 according to the present invention is formed by rolling the material leg portion 6 having the annular groove portion 6b having a diameter smaller than the effective diameter ⁇ A and larger than the valley diameter ⁇ H of the complete male thread portion 21, and a thread portion 20c is formed. Therefore, it is difficult to apply a large load to one end of a rolling tool (corresponding to 51 and 52) used during thread rolling. Moreover, the screw 1 according to the present invention can withstand higher tightening torque than the conventional one because the diameter of the annular groove 20b is larger than the effective diameter ⁇ A.
  • the screw 1 is configured by disposing a washer 40 between the head portion 10 and the screw portion 20c, and the washer 40 includes an insertion hole 40a through which the neck lower portion 6a can be inserted. . Accordingly, the washer 40 is prevented from coming off by the screw portion 20c having a larger diameter than the insertion hole 40a, and is freely supported by the neck lower portion 6a and the annular groove 6b having a smaller diameter than the insertion hole 40a. .
  • the manufacturing method of the screw 1 according to the present invention includes the material leg 6 having the same diameter as the effective diameter ⁇ A by forging the wire set to the effective diameter ⁇ A and the head connected to the material leg 6.
  • a forging step P for forming the portion 10 a groove rolling step Ra for rolling the annular groove 6b having a diameter smaller than the effective diameter ⁇ A on the material leg portion 6 formed by the forging step P, and the groove rolling It includes at least a thread rolling process Rb for forming the screw part 20c in the material leg part 6 and the part of the annular groove 6b after the process Ra.
  • the manufacturing method of the screw 1 according to the present invention may include a heat treatment step S that heat-treats the material 5 formed by rolling in the groove rolling step Ra, and the heat treatment step S includes the thread rolling step. It may be set as a pre-process of Rb.
  • the manufacturing method of the screw 1 according to the present invention may include a washer assembling step F for incorporating a washer 40 into the material 5 after the groove rolling step Ra, and the washer assembling step F includes the heat treatment. You may set as a post process of process S.
  • the forging step P is a step of inserting the wire into a receiving piece (not shown), partially protruding from the receiving piece, and pressing the protruding wire with a die to form the head 10 by forging.
  • the head 10 formed by the forging process P has a shape such as a pan or a hexagon defined in JIS standards, and has an engagement portion such as a cross hole that can engage a rotary tool on the top of the head.
  • the head portion 10 is integrally provided with a shaft portion having substantially the same diameter as the effective diameter ⁇ A inserted through the receiving piece.
  • the groove rolling step Ra is a step of rolling the shaft portion formed in the above-described columnar shape to form the annular groove 6b having a diameter smaller than the effective diameter ⁇ A, and the groove rolling step Ra is finished.
  • the material 5 includes a neck lower portion 6a that is substantially the same diameter as the effective diameter ⁇ A that is connected to the head portion 10, the annular groove 6b that is connected to the neck lower portion 6a, and the annular groove 6b that is connected to the annular groove 6b. And a material leg 6 comprising an effective diameter shaft portion 6c having substantially the same diameter as the effective diameter ⁇ A.
  • the heat treatment step S is a step of refining the structure of the material 5 made of steel by heating the material 5 that has undergone the rolling step Ra at a predetermined temperature for a predetermined time. Thereby, the raw material 5 changes to high surface hardness and high toughness suitable for a screw.
  • the washer assembling step F is a step of incorporating the washer 40 into the material 5 that has undergone the heat treatment step S, and the head 10 is suspended by the washer 40.
  • This washer assembling step F is realized by the operation of a washer assembling unit (not shown) of a rolling device (not shown) capable of rolling and forming the threaded portion 20c operated in the thread thread rolling step Rb described later. Has been.
  • the thread rolling process Rb is a process of rolling and forming the threaded portion 20c in a part of the material leg 6 and the annular groove 6b of the material 5 that has undergone a washer assembling process F, and the rolling device It is a process realized by.
  • the rolling device sandwiches the material 5 between a pair of fixed-side rolling dies 51 and a movable-side rolling die 52, rotates the material 5 by a reciprocating motion of the movable-side rolling die 52, and discharges the material 5 forward.
  • the part 20c is configured to be moldable.
  • the rolling device includes the washer-incorporating unit that incorporates the washer 40 into the material 5 before supplying the material 5 to the fixed-side rolling die 51 and the movable-side rolling die 52.
  • the thread rolling process Rb undergoes a process as shown in FIGS. 4 to 5 so that the effective diameter shaft portion 6c and a part of the annular groove 6b are replaced by the complete male screw portion 21 and the incomplete male thread portion 21b. Molded into the threaded portion 22. Further, the inclined chevron shapes attached to the fixed-side rolling die 51 and the movable-side rolling die 52 approach each other from the position shown in FIG. 4 to the position shown in FIG. 5, thereby gradually completing the screw portion 20c. However, although it interferes deeply with the effective diameter portion 6c set to the effective diameter ⁇ A, it interferes only shallowly with the annular groove 6b set to a diameter smaller than the effective diameter ⁇ A.
  • one end side of the fixed-side rolling die 51 and the movable-side rolling die 52 is an incomplete male thread portion that is plastically processed in the above-described shallowly interfering annular groove 6b and fits in a regular complete thread shape. 22 is molded.
  • the screw 1 that has finished the thread rolling step Rb is formed by forming the threaded portion 20c in a part of the annular groove 6b as shown in FIGS. It changes from the annular groove 6b before fabrication to an annular groove part 20b whose axial length is slightly shortened. Accordingly, the screw 1 includes an annular groove portion 20b having the same diameter as the annular groove 6b, an incomplete male screw portion 22 connected to the annular groove portion 20b, and a screw leg portion 20 including the complete male screw portion 21. If the washer assembly process F is set, the washer 40 that is constituted by the screw leg portion 20 and the head portion 10 is prevented from being loosened by the incomplete male screw portion 22 and can be freely fitted. Be prepared. Further, the washer 40 is attached by including at least a part of the annular groove 20b.
  • the screw 1 according to the present invention is not limited to the one that incorporates the washer 40, but the annular groove 6b that does not include the neck lower portion 6a in the material leg portion 6, and the effective diameter shaft portion 6c.
  • the structure as shown in FIG. 1 is not limited to the one that incorporates the washer 40, but the annular groove 6b that does not include the neck lower portion 6a in the material leg portion 6, and the effective diameter shaft portion 6c.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Forging (AREA)

Abstract

Le problème décrit par la présente invention est de fournir une vis qui peut être vissée jusqu'à ce qu'elle adhère étroitement à la surface d'une pièce. La solution selon l'invention porte sur une vis dans laquelle une section de vis mâle complète (21) formant une forme de crête de filetage mâle complet hélicoïdal et une section de vis mâle incomplète (22) formant une forme de crête de filetage mâle incomplet en continuité avec la section de vis mâle complète (21) sont formées en réalisant un laminage sur une partie de patte de matière première (6) dont le diamètre a été fixé de façon à être sensiblement le même que le diamètre effectif ⌀A de la vis mâle. La partie de patte de matière première (6) est formée d'un seul tenant avec une section d'arbre de diamètre effectif (6c) dont le diamètre effectif est fixé à ⌀A, et une rainure annulaire (6b) ayant un diamètre plus petit que la section d'arbre de diamètre effectif (6c). La rainure annulaire (6b) présente un diamètre qui est plus petit que le diamètre effectif ⌀A et plus grand que le diamètre de creux ⌀H de la section de vis mâle complète (21). La partie de patte de matière première (6) est déformée élastiquement par laminage pour former une partie de patte de vis (20), ce par quoi une partie de vis (20c) comprenant la section de vis mâle complète (21) et la section de vis mâle incomplète (22), et une partie de rainure annulaire (20b) ayant une longueur axiale plus courte que la rainure annulaire (6b) sont formées. La section de vis mâle incomplète (22) forme une forme de crête de filetage mâle incomplète qui est progressivement réduite dans la direction de diamètre depuis la section d'arbre de diamètre effectif (6c) vers la rainure annulaire (6b) de la partie de patte de matière première (6).
PCT/JP2017/007939 2017-02-28 2017-02-28 Vis et son procédé de fabrication Ceased WO2018158845A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2017/007939 WO2018158845A1 (fr) 2017-02-28 2017-02-28 Vis et son procédé de fabrication
JP2019502336A JP6872004B2 (ja) 2017-02-28 2017-02-28 ねじおよびその製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/007939 WO2018158845A1 (fr) 2017-02-28 2017-02-28 Vis et son procédé de fabrication

Publications (1)

Publication Number Publication Date
WO2018158845A1 true WO2018158845A1 (fr) 2018-09-07

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PCT/JP2017/007939 Ceased WO2018158845A1 (fr) 2017-02-28 2017-02-28 Vis et son procédé de fabrication

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JP (1) JP6872004B2 (fr)
WO (1) WO2018158845A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220341456A1 (en) * 2019-09-13 2022-10-27 Nsk Ltd. Rolled thread screw and rolled thread screw manufacturing method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56146115U (fr) * 1980-04-03 1981-11-04
JPS56141932A (en) * 1980-04-02 1981-11-05 Yasuyuki Naito Production of washer built-in screw
JPH02268935A (ja) * 1989-04-07 1990-11-02 Nitto Seiko Co Ltd 座金組込みねじの転造方法
JPH07310723A (ja) * 1994-05-16 1995-11-28 Toopura:Kk 座金組込ボルトおよびその製造方法
JP2002020839A (ja) * 2000-07-04 2002-01-23 Nissan Neji Kk 座金組込ボルト及びその製造方法
JP2003247522A (ja) * 2002-02-27 2003-09-05 Nitto Seiko Co Ltd 座金組込薄頭ねじ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56141932A (en) * 1980-04-02 1981-11-05 Yasuyuki Naito Production of washer built-in screw
JPS56146115U (fr) * 1980-04-03 1981-11-04
JPH02268935A (ja) * 1989-04-07 1990-11-02 Nitto Seiko Co Ltd 座金組込みねじの転造方法
JPH07310723A (ja) * 1994-05-16 1995-11-28 Toopura:Kk 座金組込ボルトおよびその製造方法
JP2002020839A (ja) * 2000-07-04 2002-01-23 Nissan Neji Kk 座金組込ボルト及びその製造方法
JP2003247522A (ja) * 2002-02-27 2003-09-05 Nitto Seiko Co Ltd 座金組込薄頭ねじ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220341456A1 (en) * 2019-09-13 2022-10-27 Nsk Ltd. Rolled thread screw and rolled thread screw manufacturing method
US12152624B2 (en) * 2019-09-13 2024-11-26 Nsk Ltd. Rolled thread screw and rolled thread screw manufacturing method

Also Published As

Publication number Publication date
JPWO2018158845A1 (ja) 2019-12-19
JP6872004B2 (ja) 2021-05-19

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